/* Global — OpenAI Platform-inspired palette */
/* Global — Clean Minimal palette */
:root {
  color-scheme: light;
  font-family: 'Inter', ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  font-size: 16px;
  line-height: 1.6;
  color: #0f172a;
  background: #ffffff;
  --text: #0f172a;
  --muted: #475569;
  --muted-light: #94a3b8;
  --surface: #ffffff;
  --surface-soft: #f1f6ff;
  --surface-elevated: #e8f0fe;
  --border: #e2e8f0;
  --border-strong: #cbd5e1;
  --accent: #6366f1;
  --accent-strong: #4f46e5;
  --accent-soft: rgba(59, 130, 246, 0.16);
  --accent-tint: rgba(59, 130, 246, 0.1);
  --page-bg: #f8fbff;
  --page-bg-soft: #f1f6ff;
  --page-gradient:
    linear-gradient(180deg, rgba(59, 130, 246, 0.14), rgba(99, 102, 241, 0.06) 48%, rgba(59, 130, 246, 0.02) 100%),
    linear-gradient(180deg, #f5f9ff 0%, #eef4ff 55%, #f8fbff 100%);
  --hero-tint: linear-gradient(165deg, #e0edff 0%, #eef4ff 40%, #f8fbff 100%);
  --cta: #6366f1;
  --cta-hover: #4f46e5;
  --cta-gradient: linear-gradient(135deg, #818cf8 0%, #6366f1 50%, #4f46e5 100%);
  --hero-start: #e8f1ff;
  --hero-end: #f8fbff;
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.04);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.08);
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-weight: 400;
  background: var(--page-gradient);
  color: var(--text);
}

body.modal-open {
  overflow: hidden;
}

/* App shell with left sidebar (Dashboard + Study) */
.app-layout {
  display: flex;
  min-height: 100vh;
  background: var(--page-gradient);
}

.app-sidebar {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 30;
  display: flex;
  flex-direction: column;
  width: 240px;
  height: 100vh;
  padding: 0.85rem 0.65rem;
  border-right: 1px solid var(--border);
  background: #ffffff;
  overflow-y: auto;
}

.app-sidebar-top {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.5rem 0.75rem;
  min-width: 0;
}

.app-sidebar-brand {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  min-width: 0;
  flex: 1;
}

.app-sidebar-logo {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 0.35rem;
  background: var(--accent);
  color: #ffffff;
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}

.app-sidebar-brand-text {
  font-size: 0.88rem;
  font-weight: 600;
  color: #0d0d0d;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.app-sidebar-badge {
  flex-shrink: 0;
  padding: 0.12rem 0.45rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #ffffff;
  color: #64748b;
  font-size: 0.68rem;
  font-weight: 600;
}

.app-sidebar-search {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0 0.35rem 0.75rem;
  padding: 0.45rem 0.65rem;
  border-radius: 0.55rem;
  border: 1px solid var(--border);
  background: #ffffff;
}

.app-sidebar-search svg {
  width: 0.9rem;
  height: 0.9rem;
  color: #94a3b8;
  flex-shrink: 0;
}

.app-sidebar-search input {
  width: 100%;
  border: none;
  background: transparent;
  padding: 0;
  font-size: 0.82rem;
  color: #0d0d0d;
  outline: none;
}

.app-sidebar-search input::placeholder {
  color: #94a3b8;
}

.app-sidebar-label {
  margin: 0.25rem 0.5rem 0.35rem;
  color: #94a3b8;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}

.app-sidebar-nav {
  display: grid;
  gap: 0.1rem;
  padding: 0 0.2rem;
}

.app-sidebar-link {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  width: 100%;
  padding: 0.42rem 0.55rem;
  border: none;
  border-radius: 0.45rem;
  background: transparent;
  color: #64748b;
  font-size: 0.82rem;
  font-weight: 500;
  text-align: left;
  cursor: pointer;
  transition: background 0.12s ease, color 0.12s ease;
}

.app-sidebar-link svg {
  width: 0.95rem;
  height: 0.95rem;
  flex-shrink: 0;
  opacity: 0.85;
}

.app-sidebar-link:hover {
  background: rgba(15, 23, 42, 0.05);
  color: #0d0d0d;
}

.app-sidebar-link.is-active {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 600;
}

.app-sidebar-link.is-active svg {
  opacity: 1;
  color: var(--accent-strong);
}

.app-sidebar-divider {
  height: 1px;
  margin: 0.65rem 0.5rem;
  background: var(--border);
}

.app-sidebar-footer {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  margin-top: auto;
  padding: 0.65rem 0.35rem 0.25rem;
  border-top: 1px solid var(--border);
}

.app-sidebar-user {
  display: flex;
  align-items: center;
  gap: 0.55rem;
  width: 100%;
  padding: 0.45rem 0.5rem;
  border: none;
  border-radius: 0.55rem;
  background: transparent;
  text-align: left;
  cursor: pointer;
  flex: 1;
  min-width: 0;
}

.app-sidebar-user:hover {
  background: rgba(15, 23, 42, 0.05);
}

.app-sidebar-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.65rem;
  height: 1.65rem;
  border-radius: 999px;
  background: #e2e8f0;
  color: #475569;
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}

.app-sidebar-user-copy {
  display: grid;
  gap: 0.05rem;
  min-width: 0;
  flex: 1;
}

.app-sidebar-user-copy strong {
  color: #0d0d0d;
  font-size: 0.8rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.app-sidebar-user-copy span {
  color: #94a3b8;
  font-size: 0.72rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.sidebar-user-actions {
  display: inline-flex;
  flex-shrink: 0;
}

.app-sidebar-signout {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.65rem;
  height: 1.65rem;
  padding: 0;
  border: none;
  border-radius: 0.4rem;
  background: transparent;
  color: #94a3b8;
  cursor: pointer;
}

.app-sidebar-signout svg {
  width: 1rem;
  height: 1rem;
}

.app-sidebar-signout:hover {
  background: rgba(15, 23, 42, 0.06);
  color: #0d0d0d;
}

.app-main {
  flex: 1;
  min-width: 0;
  margin-left: 240px;
}

.app-main-inner {
  width: min(960px, calc(100% - 2.5rem));
  margin: 0 auto;
  padding: 1.75rem 0 3rem;
}

.app-layout .dashboard-page {
  padding-bottom: 2rem;
}

@media (max-width: 900px) {
  .app-sidebar {
    width: 220px;
  }

  .app-main {
    margin-left: 220px;
  }
}

@media (max-width: 720px) {
  .app-layout {
    flex-direction: column;
  }

  .app-sidebar {
    position: relative;
    width: 100%;
    height: auto;
    max-height: none;
    border-right: none;
    border-bottom: 1px solid var(--border);
  }

  .app-sidebar-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .app-sidebar-footer {
    margin-top: 0;
  }

  .app-main {
    margin-left: 0;
  }

  .app-main-inner {
    width: calc(100% - 1.5rem);
    padding-top: 1.25rem;
  }
}

a {
  color: inherit;
  text-decoration: none;
}

button,
input,
textarea,
select {
  font: inherit;
}

img {
  max-width: 100%;
  display: block;
}

.container {
  width: min(1180px, calc(100% - 2rem));
  margin: 0 auto;
}

.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  background: rgba(255, 255, 255, 0.92);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
  box-shadow: 0 1px 0 var(--accent-tint);
}

.topbar-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  min-height: 68px;
}

.brand {
  font-weight: 600;
  font-size: 1.1rem;
  letter-spacing: -0.02em;
  color: var(--text);
}

.nav-links {
  display: flex;
  align-items: center;
  gap: 1.3rem;
  flex-wrap: wrap;
}

.nav-links a {
  color: var(--muted);
  font-weight: 500;
}

.nav-signin {
  font-weight: 500;
  color: var(--text);
}

.nav-user {
  color: #0d0d0d;
  font-weight: 600;
}

.nav-signout {
  color: #64748b;
  font-weight: 500;
  background: none;
  border: none;
  padding: 0;
  cursor: pointer;
  font: inherit;
}

.nav-signout:hover {
  color: var(--accent-strong);
}

.hero {
  padding: 5rem 0 4rem;
  background: var(--page-bg-soft);
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

.hero-grid {
  display: grid;
  grid-template-columns: 1.1fr 0.9fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-copy {
  max-width: 640px;
}

.hero-copy h1 {
  margin: 0;
  font-weight: 600;
  font-size: clamp(2.75rem, 5.5vw, 3.8rem);
  line-height: 1.08;
  letter-spacing: -0.04em;
  color: #ffffff;
}

.hero-copy p {
  margin: 1.75rem 0 0;
  max-width: 44rem;
  color: rgba(248, 250, 252, 0.86);
  font-size: 1.05rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  margin-top: 2.2rem;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.75rem 1.5rem;
  border-radius: 0.75rem;
  font-weight: 600;
  font-size: 0.95rem;
  border: none;
  cursor: pointer;
  transition: background-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
}

.button:hover {
  transform: translateY(-1px);
}

.button-primary {
  background: var(--cta-gradient);
  color: #ffffff;
  border: none;
  box-shadow: 0 2px 8px rgba(99,102,241,0.12);
}

.button-primary:hover {
  background: linear-gradient(135deg, #4f46e5 0%, #0a7a5e 100%);
  box-shadow: 0 4px 12px rgba(99,102,241,0.12);
}

.nav-cta-btn {
  border-radius: 999px;
  padding: 0.6rem 1.15rem;
  font-weight: 600;
}

.nav-links a.is-current:not(.nav-study-btn) {
  color: #0d0d0d;
  font-weight: 600;
}

.nav-links .nav-study-btn.is-current {
  background: var(--surface-elevated);
  border-color: var(--border-strong);
  box-shadow: none;
}

.nav-user-wrap {
  display: inline-flex;
  align-items: center;
  gap: 1rem;
}

.topbar .nav-study-btn,
.topbar .ai-study-btn.button-primary,
.button-soft {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.55rem 1rem;
  border-radius: 0.65rem;
  font-size: 0.9rem;
  font-weight: 600;
  background: #ffffff;
  color: var(--text);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
  transition: background-color 0.15s ease, border-color 0.15s ease, transform 0.15s ease;
  cursor: pointer;
  text-decoration: none;
}

.topbar .nav-study-btn:hover,
.topbar .ai-study-btn.button-primary:hover,
.button-soft:hover {
  background: var(--surface-soft);
  transform: translateY(-1px);
}

.signin-card .button-soft {
  width: 100%;
}

.signin-card .oauth-apple.button-soft svg path {
  fill: currentColor;
}

.button-outline {
  border: 1px solid var(--border-strong);
  color: #334155;
  background: #ffffff;
}

.button-outline:hover {
  background: var(--surface-soft);
  border-color: rgba(0, 0, 0, 0.22);
  color: var(--accent-strong);
}

.hero .button-outline,
.footer .button-outline {
  border-color: rgba(255, 255, 255, 0.35);
  color: #ffffff;
  background: rgba(255, 255, 255, 0.08);
}

.eyebrow {
  display: inline-block;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  font-weight: 600;
  margin-bottom: 0.65rem;
}

.hero .eyebrow {
  color: #c7d2fe;
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-top: 2.4rem;
}

.hero-stats-compact {
  max-width: 560px;
}

.hero-stats div {
  padding: 1.25rem 1.4rem;
  border-radius: 1.25rem;
  background: rgba(255, 255, 255, 0.12);
  border: 1px solid rgba(255, 255, 255, 0.14);
}

.hero-stats strong {
  display: block;
  font-size: 1.25rem;
  margin-bottom: 0.35rem;
  color: #ffffff;
}

.hero-stats span {
  color: rgba(248, 250, 252, 0.82);
}

.hero-shot {
  position: relative;
  border-radius: 2rem;
  padding: 2rem;
  background: var(--surface);
  border: 1px solid rgba(99,102,241,0.12);
  box-shadow: 0 28px 60px rgba(67, 56, 202, 0.12);
}

.hero-shot-top {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 1.8rem;
}

.chip {
  display: inline-flex;
  gap: 0.55rem;
  align-items: center;
  padding: 0.65rem 1rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.92rem;
}

.hero-shot-body {
  display: grid;
  gap: 1.25rem;
}

.hero-shot-label {
  display: inline-flex;
  padding: 0.45rem 0.95rem;
  border-radius: 999px;
  background: var(--surface-elevated);
  color: var(--text);
  font-size: 0.85rem;
  font-weight: 700;
}

.hero-shot-heading {
  margin: 0;
  font-size: 1.95rem;
  color: #0d0d0d;
  line-height: 1.1;
}

.hero-shot-summary {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
}

.hero-shot-item {
  padding: 1.15rem 1.25rem;
  border-radius: 1.5rem;
  background: var(--surface-soft);
  border: 1px solid rgba(99,102,241,0.12);
}

.hero-shot-item strong {
  display: block;
  font-size: 1.45rem;
  color: #111827;
}

.hero-shot-item span {
  color: #475569;
}

.hero-shot-list {
  display: grid;
  gap: 1rem;
}

.hero-shot-list div {
  display: flex;
  align-items: flex-start;
  gap: 0.9rem;
}

.hero-shot-list .dot {
  width: 0.85rem;
  height: 0.85rem;
  flex-shrink: 0;
  border-radius: 50%;
  margin-top: 0.4rem;
  background: linear-gradient(135deg, var(--text), var(--muted));
}

.hero-shot-list p {
  margin: 0;
  color: #475569;
}

.section {
  padding: 5rem 0;
}

.section-light {
  background: var(--page-bg-soft);
}

.section-split {
  background: #ffffff;
}

.section-heading.center {
  text-align: center;
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 1.5rem;
  margin-top: 2.5rem;
}

.feature-card {
  padding: 1.8rem;
  border-radius: 1.8rem;
  background: var(--surface);
  border: 1px solid rgba(99,102,241,0.12);
  box-shadow: 0 18px 40px rgba(99,102,241,0.12);
}

.feature-card strong {
  display: block;
  font-size: 1.15rem;
  margin-bottom: 0.9rem;
  color: #0d0d0d;
}

.feature-card p {
  margin: 0;
  color: #475569;
}

.split-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 2.5rem;
  align-items: center;
}

.flow-panel {
  padding: 2rem;
  border-radius: 2rem;
  background: var(--accent);
  border: 1px solid rgba(255, 255, 255, 0.08);
  box-shadow: 0 32px 70px rgba(15, 23, 42, 0.14);
}

.flow-step {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding: 1.25rem 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.flow-step:last-child {
  border-bottom: none;
}

.step-number {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  background: #38bdf8;
  color: #0d0d0d;
  font-weight: 700;
}

.flow-step h3 {
  margin: 0 0 0.35rem;
  color: #ffffff;
}

.flow-step p {
  margin: 0;
  color: rgba(248, 250, 252, 0.72);
}

@media (max-width: 1040px) {
  .hero-grid,
  .card-grid,
  .split-grid,
  .feature-grid,
  .product-grid,
  .benefit-grid,
  .testimonial-grid,
  .stats-grid,
  .footer-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 920px) {
  .split-grid { grid-template-columns: 1fr; }
  .support-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    padding-top: 3rem;
  }

  .hero-actions,
  .footer-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .hero-shot {
    padding: 1.5rem;
  }

  .hero-shot-summary {
    grid-template-columns: 1fr;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .split-grid {
    grid-template-columns: 1fr;
  }
}


.feature-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.5rem;
}

@media (max-width: 1040px) {
  .hero-grid,
  .feature-grid,
  .product-grid,
  .benefit-grid,
  .testimonial-grid,
  .stats-grid,
  .footer-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 920px) {
  .split-grid { grid-template-columns: 1fr; }
  .support-grid { grid-template-columns: 1fr; }
}

@media (max-width: 760px) {
  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    padding-top: 3rem;
  }

  .hero-actions,
  .footer-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .phone-screen {
    width: 100%;
  }
}

.hero-card-label {
  display: inline-flex;
  margin-bottom: 1.15rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  font-size: 0.78rem;
  color: #60a5fa;
}

.hero-card h3 {
  margin: 0;
  font-size: 1.85rem;
  line-height: 1.1;
}

.hero-card p {
  color: #cbd5e1;
  margin: 1.25rem 0 0;
}

.hero-card-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.section {
  padding: 5rem 0;
}

.section-muted {
  background: #f8fafc;
}

.section-heading {
  max-width: 720px;
  margin-bottom: 2.5rem;
}

.section-heading h2 {
  margin: 0.75rem 0 0;
  font-size: clamp(2rem, 4vw, 3rem);
  color: #0d0d0d;
}

.product-grid,
.benefit-grid,
.testimonial-grid,
.stats-grid,
.trust-list,
.footer-links {
  display: grid;
  gap: 1.5rem;
}

.product-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.product-card,
.benefit-card,
.testimonial-card,
.stat-card,
.trust-item {
  padding: 1.75rem;
  border-radius: var(--radius-xl);
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
}

.product-card h3,
.benefit-card h3,
.testimonial-card strong,
.stat-card strong,
.trust-item h4 {
  margin: 0 0 0.85rem;
  color: #0d0d0d;
}

.product-card p,
.benefit-card p,
.testimonial-card p,
.trust-item p {
  margin: 0;
  color: #475569;
}

.product-card {
  min-height: 200px;
}

.benefit-grid {
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.benefit-card .eyebrow {
  color: #2563eb;
  margin-bottom: 0.85rem;
}

.stats-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.stat-card {
  background: linear-gradient(180deg, #ffffff 0%, #eff6ff 100%);
}

.stat-card strong {
  font-size: 2.2rem;
  display: block;
}

.testimonial-grid {
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.testimonial-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 220px;
}

.testimonial-card p {
  font-size: 1rem;
  line-height: 1.75;
}

.testimonial-card strong {
  display: block;
  margin-top: 1.75rem;
  font-size: 1rem;
}

.testimonial-card span {
  color: #64748b;
  font-size: 0.95rem;
}

.trust-list {
  grid-template-columns: 1fr;
}

.trust-item {
  background: #ffffff;
}

.trust-item h4 {
  font-size: 1.15rem;
}

.trust-item p {
  margin-top: 0.65rem;
}

.footer {
  padding: 4rem 0 2rem;
  background: #111827;
  color: #e2e8f0;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1.5rem;
}

.footer-inner .eyebrow,
.footer-inner h2 {
  color: #ffffff;
}

.footer-inner h2 {
  margin: 0.75rem 0 0;
  max-width: 560px;
}

.footer-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
}

.footer-links {
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 2rem;
  margin-top: 3rem;
}

.footer-links strong {
  display: block;
  margin-bottom: 1rem;
  color: #ffffff;
}

.footer-links a {
  display: block;
  margin-bottom: 0.85rem;
  color: #cbd5e1;
}

.footer-copy {
  margin-top: 3rem;
  font-size: 0.95rem;
  color: #94a3b8;
}

@media (max-width: 1040px) {
  .hero-grid,
  .product-grid,
  .benefit-grid,
  .testimonial-grid,
  .stats-grid,
  .footer-links {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 760px) {
  .topbar-inner {
    flex-direction: column;
    align-items: flex-start;
  }

  .nav-links {
    width: 100%;
    justify-content: space-between;
  }

  .hero {
    padding-top: 3rem;
  }

  .hero-actions,
  .footer-actions {
    flex-direction: column;
    align-items: stretch;
  }
}

/* Support page styles */
.support-grid {
  display: grid;
  grid-template-columns: 360px 1fr;
  gap: 1.25rem;
}

.support-info h3,
.support-form h3 { margin: 0 0 0.6rem; }

.support-topics { list-style:none; padding:0; margin:0.5rem 0 0; }
.support-topics li { margin:0.45rem 0 }
.support-topics a { color: #2563eb }

.form-grid label { display:block; font-weight:600; color: #0d0d0d; margin-bottom:0.5rem }
.form-grid input, .form-grid textarea { width:100%; padding:0.6rem 0.8rem; border-radius:10px; border:1px solid rgba(15,23,42,0.06); margin-top:0.25rem }

.faq-accordion { margin-top:0.8rem }
.faq-item { margin-bottom:0.6rem }
.faq-q { width:100%; text-align:left; padding:0.8rem 1rem; border-radius:10px; background:#fff; border:1px solid rgba(15,23,42,0.06); font-weight:600 }
.faq-a { display:block; padding:0.75rem 1rem; margin-top:0.25rem; border-left:3px solid #e2e8f0; background:#ffffff }

.ai-plus {
  color: inherit;
  font-weight: 800;
}

@media (max-width: 920px){
  .support-grid { grid-template-columns: 1fr; }
}

.signin-section {
  display: flex;
  justify-content: center;
  padding-top: 3rem;
}

.signin-modal .study-modal-dialog {
  width: min(480px, 100%);
  max-height: calc(100vh - 2rem);
  padding: 1.5rem 1.65rem;
}

.signin-modal .signin-card {
  width: 100%;
  padding: 0;
  border: none;
  background: transparent;
  box-shadow: none;
}

.signin-modal-head {
  margin-bottom: 0.25rem;
}

.signin-modal-head h2 {
  margin: 0.45rem 0 0;
  font-size: 1.45rem;
  color: #0d0d0d;
}

.signin-modal-desc {
  margin: 0.65rem 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.signin-modal .signin-oauth {
  margin-top: 1.15rem;
}

.signin-form {
  margin-top: 1.15rem;
}

.signin-form .button {
  width: 100%;
  margin-top: 0.25rem;
}

.signin-card {
  width: min(460px, 100%);
}

.signin-oauth {
  display: grid;
  gap: 0.75rem;
  margin-top: 1.5rem;
}

.oauth-provider-block {
  display: grid;
  gap: 0.75rem;
}

.provider-account-panel {
  padding: 1rem;
  border-radius: 1.25rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: #f8fafc;
  animation: account-panel-in 0.18s ease;
}

.provider-account-panel.provider-google {
  border-color: rgba(66, 133, 244, 0.22);
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
}

.provider-account-panel.provider-apple {
  border-color: rgba(15, 23, 42, 0.14);
  background: linear-gradient(180deg, #ffffff 0%, #f5f5f7 100%);
}

@keyframes account-panel-in {
  from {
    opacity: 0;
    transform: translateY(-6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.provider-account-label {
  margin: 0 0 0.75rem;
  font-size: 0.92rem;
  font-weight: 600;
  color: #0d0d0d;
}

.provider-account-list {
  display: grid;
  gap: 0.65rem;
}

.provider-account-add {
  width: 100%;
  margin-top: 0.85rem;
  padding: 0.8rem 1rem;
  border: 1px dashed rgba(15, 23, 42, 0.18);
  border-radius: 1rem;
  background: transparent;
  color: var(--accent-strong);
  font-weight: 600;
  cursor: pointer;
  font: inherit;
}

.provider-account-add:hover {
  background: rgba(99,102,241,0.12);
}

.oauth-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.85rem 1rem;
  border-radius: 999px;
  font-weight: 600;
  cursor: pointer;
  transition: transform 0.18s ease, box-shadow 0.18s ease, background-color 0.18s ease;
}

.oauth-btn:hover {
  transform: translateY(-1px);
}

.oauth-btn svg {
  width: 1.15rem;
  height: 1.15rem;
  flex-shrink: 0;
}

.oauth-btn.button-soft {
  background: linear-gradient(180deg, #ffffff 0%, var(--surface-soft) 100%);
  color: var(--accent-strong);
  border: 1px solid rgba(99,102,241,0.12);
  box-shadow: 0 8px 18px rgba(99,102,241,0.12);
}

.oauth-btn.button-soft:hover {
  background: var(--surface-soft);
}

.oauth-apple {
  border: 1px solid #111827;
  background: #111827;
  color: #ffffff;
}

.oauth-apple:hover {
  background: #1f2937;
}

.oauth-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
  transform: none;
}

.signin-oauth-note {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.signin-oauth-note[data-state="error"] {
  color: #b91c1c;
  font-weight: 600;
}

.signin-oauth-result {
  margin: 0.75rem 0 0;
  padding: 0.75rem 1rem;
  border-radius: 0.85rem;
  font-size: 0.92rem;
  line-height: 1.5;
  white-space: pre-line;
}

.signin-oauth-result[data-state="error"] {
  color: #b91c1c;
  background: #fef2f2;
  border: 1px solid #fecaca;
}

.signin-oauth-result[data-state="success"] {
  color: #166534;
  background: #f0fdf4;
  border: 1px solid #bbf7d0;
}

.signin-oauth-result[data-state="info"] {
  color: #1e3a8a;
  background: #eff6ff;
  border: 1px solid #bfdbfe;
}

.signin-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.5rem 0 1.25rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.signin-divider::before,
.signin-divider::after {
  content: "";
  flex: 1;
  height: 1px;
  background: rgba(15, 23, 42, 0.1);
}

.signin-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-top: 0.25rem;
}

.signin-switch {
  margin: 1.25rem 0 0;
  color: var(--muted);
}

.signin-toggle {
  background: none;
  border: none;
  padding: 0;
  margin-left: 0.35rem;
  color: var(--accent-strong);
  font-weight: 600;
  cursor: pointer;
  font: inherit;
}

.signin-toggle:hover {
  text-decoration: underline;
}

.account-picker {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: grid;
  place-items: center;
  padding: 1rem;
}

.account-picker-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
}

.account-picker-panel {
  position: relative;
  width: min(420px, 100%);
  max-height: calc(100vh - 2rem);
  overflow: auto;
  padding: 1.5rem;
  border-radius: 1.5rem;
  background: #ffffff;
  box-shadow: 0 28px 60px rgba(15, 23, 42, 0.18);
}

.account-picker-panel.account-picker-apple {
  background: #f5f5f7;
}

.account-picker-header {
  text-align: center;
  margin-bottom: 1.25rem;
}

.account-picker-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  margin-bottom: 0.85rem;
}

.account-picker-icon svg {
  width: 2rem;
  height: 2rem;
}

.account-picker-header h3 {
  margin: 0;
  font-size: 1.35rem;
  color: #0d0d0d;
}

.account-picker-header p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.account-picker-list {
  display: grid;
  gap: 0.65rem;
}

.account-option {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 1rem;
  background: #ffffff;
  text-align: left;
  cursor: pointer;
  transition: background-color 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}

.account-picker-apple .account-option {
  background: #ffffff;
  border-radius: 0.85rem;
}

.account-option:hover {
  background: #f8fafc;
  border-color: rgba(99,102,241,0.12);
  transform: translateY(-1px);
}

.account-avatar {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  font-weight: 700;
  color: #ffffff;
  flex-shrink: 0;
}

.account-avatar.google {
  background: linear-gradient(135deg, #4285f4, #34a853);
}

.account-avatar.apple {
  background: #111827;
}

.account-option strong {
  display: block;
  color: #0d0d0d;
  font-size: 0.98rem;
}

.account-option span {
  display: block;
  color: var(--muted);
  font-size: 0.88rem;
  margin-top: 0.15rem;
}

.account-picker-add {
  width: 100%;
  margin-top: 1rem;
  padding: 0.85rem 1rem;
  border: 1px dashed rgba(15, 23, 42, 0.18);
  border-radius: 1rem;
  background: transparent;
  color: var(--accent-strong);
  font-weight: 600;
  cursor: pointer;
  font: inherit;
}

.account-picker-add:hover {
  background: rgba(99,102,241,0.12);
}

.study-intro {
  margin: 0.75rem 0 0;
  color: var(--muted);
  max-width: 640px;
}

.study-tools-grid {
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.study-tool-card {
  display: grid;
  gap: 0.65rem;
  padding: 1.35rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
  text-align: left;
  cursor: pointer;
  transition: border-color 0.15s ease, box-shadow 0.15s ease, transform 0.15s ease;
  font: inherit;
}

.study-tool-card:hover {
  border-color: rgba(0, 0, 0, 0.22);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.study-tool-card.is-active {
  border-color: rgba(0, 0, 0, 0.35);
  box-shadow: 0 0 0 3px var(--accent-soft);
}

.study-tool-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 0.65rem;
  background: var(--accent-soft);
  color: var(--accent);
}

.study-tool-icon svg {
  width: 1.25rem;
  height: 1.25rem;
}

.study-tool-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.65rem;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}

.study-tool-card strong {
  color: #0d0d0d;
  font-size: 1rem;
}

.study-tool-card span:last-child {
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.45;
}

.study-workspace {
  padding: 1.5rem;
}

.study-panel-head h3 {
  margin: 0;
  color: #0d0d0d;
}

.study-panel-head p {
  margin: 0.45rem 0 1.25rem;
  color: var(--muted);
}

.study-upload-zone {
  display: grid;
  gap: 0.35rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
  border: 1px dashed rgba(99,102,241,0.12);
  border-radius: 1.25rem;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  text-align: center;
  cursor: pointer;
}

.study-upload-title {
  font-weight: 700;
  color: #0d0d0d;
}

.study-upload-hint {
  color: var(--muted);
  font-size: 0.9rem;
}

.study-field {
  display: grid;
  gap: 0.45rem;
  margin-bottom: 1rem;
  font-weight: 600;
  color: #0d0d0d;
}

.study-field input,
.study-field textarea,
.study-field select,
.study-select {
  width: 100%;
  padding: 0.75rem 0.9rem;
  border-radius: 0.85rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  font: inherit;
  font-weight: 400;
  color: #0d0d0d;
  background: #ffffff;
}

.study-recorder {
  display: grid;
  gap: 1rem;
  padding: 1.5rem;
  margin-bottom: 1rem;
  border: 1px dashed rgba(99,102,241,0.12);
  border-radius: 1.25rem;
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  text-align: center;
}

.study-recorder-status {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  color: var(--muted);
  font-weight: 600;
}

.study-recorder-dot {
  width: 0.65rem;
  height: 0.65rem;
  border-radius: 999px;
  background: #cbd5e1;
  flex-shrink: 0;
}

.study-recorder-dot.is-recording {
  background: #ef4444;
  box-shadow: 0 0 0 4px rgba(239, 68, 68, 0.18);
  animation: study-recorder-pulse 1.2s ease-in-out infinite;
}

@keyframes study-recorder-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.55; }
}

.study-recorder-timer {
  font-size: 2rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: #0d0d0d;
  font-variant-numeric: tabular-nums;
}

.study-recorder-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}

.study-record-preview {
  width: min(100%, 420px);
  margin: 0 auto;
}

.study-result {
  margin-top: 1.25rem;
  padding: 1rem 1.15rem;
  border-radius: 1rem;
  background: #f8fafc;
  border: 1px solid rgba(15, 23, 42, 0.06);
  color: #0d0d0d;
}

.study-result h4 {
  margin: 0 0 0.75rem;
}

.study-result ul {
  margin: 0;
  padding-left: 1.2rem;
}

.study-notes-list {
  list-style: disc;
  padding-left: 1.35rem;
}

.study-notes-list li {
  margin-bottom: 0.9rem;
  line-height: 1.6;
}

.study-notes-heading {
  margin: 0 0 1rem;
  font-size: 1.15rem;
  font-weight: 700;
  color: #0f172a;
}

.study-notes-cards {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin: 0;
}

.study-note-card {
  margin: 0;
  padding: 0.95rem 1.15rem;
  border-radius: 14px;
  border: 1px solid rgba(15, 23, 42, 0.06);
  border-left: 4px solid var(--note-accent, #6366f1);
  background: var(--note-bg, rgba(99, 102, 241, 0.06));
}

.study-note-card-title {
  margin: 0 0 0.4rem;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--note-accent, #4f46e5);
}

.study-note-card-body {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.72;
  color: rgba(15, 23, 42, 0.86);
}

.study-note-sky    { --note-accent: #0284c7; --note-bg: rgba(2, 132, 199, 0.07); }
.study-note-violet { --note-accent: #7c3aed; --note-bg: rgba(124, 58, 237, 0.07); }
.study-note-emerald{ --note-accent: #059669; --note-bg: rgba(5, 150, 105, 0.07); }
.study-note-amber  { --note-accent: #d97706; --note-bg: rgba(217, 119, 6, 0.09); }
.study-note-rose   { --note-accent: #e11d48; --note-bg: rgba(225, 29, 72, 0.07); }
.study-note-cyan   { --note-accent: #0891b2; --note-bg: rgba(8, 145, 178, 0.07); }

/* Structured notes document */
.study-note-doc {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}

.study-note-doc-title {
  margin: 0;
  font-size: 1.6rem;
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: #0f172a;
}

.study-note-intro {
  margin: 0;
  font-size: 1rem;
  line-height: 1.75;
  color: rgba(15, 23, 42, 0.72);
}

.study-note-section {
  position: relative;
  padding: 1.15rem 1.25rem 1.25rem;
  border-radius: 16px;
  border: 1px solid rgba(15, 23, 42, 0.07);
  border-left: 4px solid var(--note-accent, #6366f1);
  background: #ffffff;
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.04);
}

.study-note-section-head {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  margin-bottom: 0.7rem;
  flex-wrap: wrap;
}

.study-note-part-badge {
  flex: none;
  display: inline-flex;
  align-items: center;
  padding: 0.22rem 0.62rem;
  border-radius: 999px;
  font-size: 0.64rem;
  font-weight: 800;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--note-accent, #6366f1);
  background: var(--note-bg, rgba(99, 102, 241, 0.1));
}

.study-note-section-heading {
  margin: 0;
  font-size: 1.12rem;
  font-weight: 700;
  line-height: 1.35;
  color: #0f172a;
}

.study-note-section-body {
  margin: 0 0 0.75rem;
  font-size: 0.97rem;
  line-height: 1.7;
  color: rgba(15, 23, 42, 0.74);
}

.study-note-points {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}

.study-note-point {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.97rem;
  line-height: 1.65;
  color: rgba(15, 23, 42, 0.82);
}

.study-note-point::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--note-accent, #6366f1);
}

.study-note-term {
  color: #0f172a;
  font-weight: 700;
}

.study-note-example {
  margin-top: 0.9rem;
  padding: 0.85rem 1rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 12px;
  background: #f8fafc;
}

.study-note-example-label {
  display: block;
  font-size: 0.7rem;
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--note-accent, #6366f1);
  margin-bottom: 0.35rem;
}

.study-note-example p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.65;
  color: rgba(15, 23, 42, 0.74);
}

.study-note-group {
  display: flex;
  flex-direction: column;
  gap: 0.9rem;
}

.study-note-group-label {
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: rgba(15, 23, 42, 0.5);
}

.study-note-group-key { color: #d97706; }
.study-note-group-warn { color: #e11d48; }

.study-note-comparison {
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 14px;
  padding: 1rem 1.1rem;
  background: #ffffff;
}

.study-note-comparison-title {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 700;
  color: #0f172a;
}

.study-note-table-wrap { overflow-x: auto; }

.study-note-table {
  width: 100%;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.study-note-table th {
  text-align: left;
  padding: 0.5rem 0.75rem;
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: rgba(15, 23, 42, 0.5);
  font-weight: 700;
}

.study-note-table td {
  padding: 0.6rem 0.75rem;
  border-top: 1px solid rgba(15, 23, 42, 0.06);
  color: rgba(15, 23, 42, 0.8);
  line-height: 1.5;
  vertical-align: top;
}

.study-note-cmp-label {
  font-weight: 600;
  color: #0f172a;
}

.study-note-concepts {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 0.75rem;
}

.study-note-concept {
  padding: 0.9rem 1rem;
  border-radius: 14px;
  border: 1px solid rgba(15, 23, 42, 0.06);
  background: var(--note-bg, rgba(99, 102, 241, 0.05));
}

.study-note-concept-term {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 700;
  color: #0f172a;
  margin-bottom: 0.35rem;
}

.study-note-diamond {
  width: 10px;
  height: 10px;
  border-radius: 3px;
  transform: rotate(45deg);
  background: var(--note-accent, #6366f1);
  flex: none;
}

.study-note-concept p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.6;
  color: rgba(15, 23, 42, 0.72);
}

.study-note-pitfalls {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.study-note-pitfall {
  border: 1px solid rgba(15, 23, 42, 0.08);
  border-radius: 14px;
  overflow: hidden;
}

.study-note-dont { padding: 0.85rem 1rem; background: #fef2f2; }
.study-note-instead {
  padding: 0.85rem 1rem;
  background: #f0fdf4;
  border-top: 1px solid rgba(15, 23, 42, 0.06);
}

/* Myth vs. Reality — two-column comparison */
.study-note-myth-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
}

.study-note-myth {
  padding: 0.85rem 1rem;
  background: #fef2f2;
}

.study-note-reality {
  padding: 0.85rem 1rem;
  background: #f0fdf4;
  border-left: 1px solid rgba(15, 23, 42, 0.08);
}

@media (max-width: 640px) {
  .study-note-myth-row {
    grid-template-columns: 1fr;
  }
  .study-note-reality {
    border-left: none;
    border-top: 1px solid rgba(15, 23, 42, 0.08);
  }
}

.study-note-pitfall-label {
  display: block;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  margin-bottom: 0.3rem;
}

.study-note-pitfall-dont { color: #dc2626; }
.study-note-pitfall-fix { color: #16a34a; }

.study-note-pitfall p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.6;
  color: rgba(15, 23, 42, 0.8);
}

.study-rich-text strong {
  color: #0d0d0d;
  font-weight: 600;
}

.study-rich-text .katex {
  font-size: 1.05em;
}

.study-rich-text .katex-display {
  margin: 0.5rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

.study-result-meta {
  margin-top: 0.75rem;
  color: var(--muted);
  font-size: 0.92rem;
}

.study-quiz-item {
  margin-top: 0.85rem;
}

.study-quiz-item ul {
  margin: 0.35rem 0 0;
}

.study-step {
  margin-top: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: 0.85rem;
  background: #ffffff;
  border: 1px solid rgba(15, 23, 42, 0.06);
}

.study-step p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.study-field-optional {
  color: #94a3b8;
  font-weight: 500;
  font-size: 0.82rem;
}

.study-podcast-segments,
.study-podcast-script {
  margin-top: 1.25rem;
}

.study-podcast-segments h5,
.study-podcast-script h5 {
  margin: 0 0 0.75rem;
  color: #0d0d0d;
  font-size: 0.95rem;
}

.study-podcast-segment {
  display: flex;
  gap: 0.85rem;
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}

.study-podcast-segment:last-child {
  border-bottom: none;
}

.study-podcast-time {
  flex-shrink: 0;
  min-width: 2.75rem;
  color: var(--accent-strong);
  font-size: 0.82rem;
  font-weight: 700;
}

.study-podcast-segment p,
.study-podcast-line p {
  margin: 0.25rem 0 0;
  color: var(--muted);
  line-height: 1.5;
}

.study-podcast-line {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.study-podcast-line:last-child {
  border-bottom: none;
}

.study-podcast-line strong {
  color: #0d0d0d;
  font-size: 0.88rem;
}

.study-podcast-line-male strong {
  color: #2563eb;
}

.study-podcast-line-female strong {
  color: #db2777;
}

.study-podcast-audio {
  margin: 1rem 0 1.25rem;
  padding: 1rem 1.15rem;
  border-radius: 12px;
  background: #f8fafc;
  border: 1px solid var(--border);
}

.study-podcast-title {
  margin: 0 0 0.5rem;
  font-size: 1.25rem;
  color: #0d0d0d;
}

.study-podcast-meta {
  margin: 0 0 1rem;
}

.study-podcast-desc {
  margin: 0;
  color: #334155;
  line-height: 1.65;
  font-size: 0.98rem;
}

.study-podcast-audio-minimal {
  margin-top: 1.25rem;
  padding: 1rem 1.15rem;
  border-radius: 12px;
  background: var(--accent-soft);
  border: 1px solid rgba(99,102,241,0.12);
}

.study-podcast-player-row {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.study-podcast-play-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.55rem;
  width: auto;
  min-width: 11rem;
  padding: 0.8rem 1.5rem;
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.study-podcast-play-btn:disabled {
  opacity: 0.75;
  cursor: wait;
}

.study-podcast-play-btn svg,
.study-podcast-browser-btn svg {
  width: 1.1rem;
  height: 1.1rem;
  flex-shrink: 0;
}

.study-podcast-play-icon {
  width: 1.15rem;
  height: 1.15rem;
}

.study-podcast-player-minimal {
  width: 100%;
  min-height: 2.75rem;
  margin-top: 0.25rem;
}

.study-podcast-player-minimal:not([hidden]) {
  display: block;
}

.study-podcast-audio-status {
  margin: 0 0 0.75rem;
  font-size: 0.9rem;
  color: var(--muted);
}

.study-podcast-audio-status.is-loading::before {
  content: '';
  display: inline-block;
  width: 0.85rem;
  height: 0.85rem;
  margin-right: 0.45rem;
  border: 2px solid rgba(0, 0, 0, 0.25);
  border-top-color: var(--accent);
  border-radius: 50%;
  vertical-align: -0.1rem;
  animation: study-podcast-spin 0.8s linear infinite;
}

@keyframes study-podcast-spin {
  to { transform: rotate(360deg); }
}

.study-podcast-play-btn {
  margin-bottom: 0;
}

.study-podcast-voices {
  margin: 0;
}

.study-review-section {
  padding-top: 0;
}

.study-review-controls,
.study-session-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.study-session {
  margin-top: 1.25rem;
}

.study-card-box {
  min-height: 160px;
}

.study-card-question {
  font-size: 1.15rem;
  font-weight: 700;
}

.study-card-answer {
  margin-top: 0.75rem;
  color: var(--muted);
}

.study-progress {
  margin-top: 0.75rem;
  color: var(--muted);
}

.study-deck-editor {
  margin-top: 1rem;
}

.study-deck-cards {
  margin-top: 1rem;
}

@media (max-width: 1100px) {
  .study-tools-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (max-width: 920px) {
  .study-tools-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .study-tools-grid {
    grid-template-columns: 1fr;
  }
}

.dashboard-page {
  padding-bottom: 3rem;
}

.dashboard-top {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1.5rem;
  margin-bottom: 1.5rem;
  padding-bottom: 1.5rem;
  border-bottom: 1px solid var(--border);
}

.dashboard-top h2 {
  margin: 0.45rem 0 0;
  font-size: clamp(1.75rem, 3.5vw, 2.25rem);
  color: #0d0d0d;
}

.dashboard-top-copy p:last-child {
  margin: 0.65rem 0 0;
  max-width: 520px;
  color: var(--muted);
  line-height: 1.55;
}

.dashboard-overview {
  margin-bottom: 1.75rem;
}

.dashboard-overview-block {
  display: grid;
  gap: 0.85rem;
  min-width: 0;
}

.dashboard-section-label {
  margin: 0;
  color: #64748b;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dashboard-overview-divider {
  width: 1px;
  align-self: stretch;
  background: var(--border);
}

.dashboard-shortcuts {
  display: grid;
  gap: 0.55rem;
}

.dashboard-shortcut {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  width: 100%;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface-soft);
  text-decoration: none;
  text-align: left;
  transition: border-color 0.15s ease, background 0.15s ease;
}

.dashboard-shortcut:hover {
  border-color: rgba(0, 0, 0, 0.22);
  background: #ffffff;
}

.dashboard-shortcut-btn {
  cursor: pointer;
  font: inherit;
  color: inherit;
}

.dashboard-shortcut-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.55rem;
  background: #ffffff;
  color: var(--accent);
  border: 1px solid var(--border);
  flex-shrink: 0;
}

.dashboard-shortcut-icon svg {
  width: 1rem;
  height: 1rem;
}

.dashboard-shortcut-copy {
  display: grid;
  gap: 0.1rem;
  min-width: 0;
}

.dashboard-shortcut-copy strong {
  color: #0d0d0d;
  font-size: 0.9rem;
}

.dashboard-shortcut-copy span:last-child {
  color: var(--muted);
  font-size: 0.8rem;
}

.dashboard-library {
  display: grid;
  gap: 1rem;
}

.dashboard-library-head h3 {
  margin: 0;
  color: #0d0d0d;
  font-size: 1.15rem;
}

.dashboard-library-head p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.dashboard-panel {
  margin-bottom: 1.25rem;
  padding: 1.35rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}

.dashboard-panel-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.15rem;
}

.dashboard-panel-head h4 {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  color: #0d0d0d;
  font-size: 1rem;
}

.dashboard-panel-head p {
  margin: 0.3rem 0 0;
  color: var(--muted);
  font-size: 0.86rem;
}

.dashboard-panel-badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.45rem;
  height: 1.45rem;
  padding: 0 0.4rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 700;
}

.dashboard-form-title {
  margin: 0 0 0.75rem;
  color: #0d0d0d;
  font-size: 0.92rem;
  font-weight: 600;
}

.button-sm {
  padding: 0.45rem 0.85rem;
  font-size: 0.84rem;
}

.dashboard-stats-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.75rem;
}

.dashboard-stat-card {
  display: grid;
  gap: 0.3rem;
  padding: 0.9rem 1rem;
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  border: 1px solid var(--border);
}

.dashboard-stat-card-highlight {
  background: linear-gradient(180deg, #ffffff 0%, #f5f7ff 100%);
  border-color: rgba(0, 0, 0, 0.18);
}

.dashboard-stat-card-highlight strong {
  color: var(--accent-strong);
}

.dashboard-stat-label {
  color: var(--muted);
  font-size: 0.76rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
}

.dashboard-stat-card strong {
  color: #0d0d0d;
  font-size: 1.5rem;
  line-height: 1.1;
}

.dashboard-main-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.25rem;
  align-items: start;
}

.dashboard-main-grid .dashboard-panel {
  margin-bottom: 0;
}

.dashboard-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.dashboard-action-card {
  display: grid;
  gap: 0.35rem;
  padding: 1.35rem 1.5rem;
  border-radius: 1.25rem;
  border: 1px solid rgba(99,102,241,0.12);
  background: #ffffff;
  box-shadow: 0 12px 28px rgba(99,102,241,0.12);
  text-decoration: none;
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.dashboard-action-card:hover {
  transform: translateY(-2px);
  border-color: rgba(99,102,241,0.12);
  box-shadow: 0 18px 36px rgba(99,102,241,0.12);
}

.dashboard-action-card strong {
  color: #0d0d0d;
  font-size: 1.05rem;
}

.dashboard-action-card span:last-child {
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.45;
}

.dashboard-action-label {
  color: var(--accent-strong);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.dashboard-action-primary {
  background: linear-gradient(180deg, #ffffff 0%, var(--surface-soft) 100%);
  border-color: rgba(99,102,241,0.12);
}

.dashboard-stats {
  margin-bottom: 2rem;
}

.dashboard-folders {
  margin-bottom: 2rem;
}

.dashboard-folder-modal-body {
  display: grid;
  gap: 1rem;
}

.dashboard-folder-modal-body .study-modal-actions {
  margin-top: 0.25rem;
}

.dashboard-folder-list {
  display: grid;
  gap: 0.75rem;
}

.dashboard-actions {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1rem;
  margin-bottom: 2rem;
}

.dashboard-folder-card {
  padding: 1.25rem 1.35rem;
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  background: #ffffff;
  box-shadow: var(--shadow-sm);
}

.dashboard-folder-card-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  margin-bottom: 0.5rem;
}

.dashboard-folder-card strong {
  color: #0d0d0d;
  font-size: 1rem;
}

.dashboard-folder-meta {
  color: #94a3b8;
  font-size: 0.78rem;
}

.dashboard-folder-card p {
  margin: 0.55rem 0 0 2.65rem;
  color: var(--muted);
  line-height: 1.5;
  font-size: 0.88rem;
}

.dashboard-folder-delete {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: none;
  border-radius: 0.5rem;
  background: var(--surface-soft);
  color: #64748b;
  cursor: pointer;
  flex-shrink: 0;
}

.dashboard-folder-delete svg {
  width: 0.95rem;
  height: 0.95rem;
}

.dashboard-folder-delete:hover {
  background: #fee2e2;
  color: #dc2626;
}

.dashboard-recent-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.dashboard-recent-head h3 {
  margin: 0;
  color: #0d0d0d;
}

.dashboard-link {
  color: var(--accent-strong);
  font-weight: 600;
  font-size: 0.92rem;
}

.dashboard-deck-list {
  display: grid;
  gap: 0.75rem;
}

.dashboard-folder-card-title {
  display: inline-flex;
  align-items: flex-start;
  gap: 0.65rem;
  min-width: 0;
  flex: 1;
}

.dashboard-folder-card-copy {
  display: grid;
  gap: 0.15rem;
  min-width: 0;
}

.dashboard-folder-card-copy strong {
  color: #0d0d0d;
  font-size: 0.95rem;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dashboard-folder-icon,
.dashboard-deck-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.55rem;
  background: var(--accent-soft);
  color: var(--accent);
  flex-shrink: 0;
}

.dashboard-folder-icon svg,
.dashboard-deck-icon svg {
  width: 1rem;
  height: 1rem;
}

.dashboard-deck-card {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.95rem 1.1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: #ffffff;
}

.dashboard-deck-copy {
  display: grid;
  gap: 0.15rem;
  min-width: 0;
  flex: 1;
}

.dashboard-deck-badge {
  flex-shrink: 0;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 700;
}

.dashboard-deck-badge-muted {
  background: var(--surface-soft);
  color: #94a3b8;
  font-weight: 600;
}

.dashboard-deck-copy strong {
  color: #0d0d0d;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.dashboard-deck-copy span {
  color: var(--muted);
  font-size: 0.86rem;
}

.dashboard-empty {
  padding: 1.35rem 1.25rem;
  border-radius: var(--radius-lg);
  border: 1px dashed rgba(0, 0, 0, 0.22);
  background: var(--surface-soft);
  color: var(--muted);
}

.dashboard-empty strong {
  display: block;
  margin-bottom: 0.35rem;
  color: #0d0d0d;
  font-size: 0.95rem;
}

.dashboard-empty p {
  margin: 0;
  line-height: 1.5;
}

.dashboard-empty a,
.dashboard-empty-link {
  color: var(--accent-strong);
  font-weight: 600;
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  cursor: pointer;
  text-decoration: underline;
  text-underline-offset: 2px;
}

@media (max-width: 920px) {
  .dashboard-overview {
    grid-template-columns: 1fr;
  }

  .dashboard-overview-divider {
    width: 100%;
    height: 1px;
  }

  .dashboard-main-grid,
  .dashboard-stats-grid {
    grid-template-columns: 1fr;
  }

  .dashboard-stats-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 720px) {
  .dashboard-actions {
    grid-template-columns: 1fr;
  }
}

/* Study tool modal */
.study-modal {
  position: fixed;
  inset: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.study-modal[hidden] {
  display: none !important;
}

.study-modal-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.45);
  backdrop-filter: blur(4px);
}

.study-modal-dialog {
  position: relative;
  width: min(520px, 100%);
  max-height: calc(100vh - 2.5rem);
  overflow-y: auto;
  padding: 1.75rem;
  border-radius: 1.25rem;
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.study-modal-close {
  position: absolute;
  top: 1rem;
  right: 1rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: none;
  border-radius: 0.5rem;
  background: var(--surface-soft);
  color: #64748b;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.study-modal-close svg {
  width: 1rem;
  height: 1rem;
}

.study-modal-close:hover {
  background: #eef2ff;
  color: #0d0d0d;
}

.study-modal-header {
  display: flex;
  gap: 1rem;
  align-items: flex-start;
  padding-right: 2rem;
  margin-bottom: 1.5rem;
}

.study-modal-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 0.75rem;
  background: var(--accent-soft);
  color: var(--accent);
  flex-shrink: 0;
}

.study-modal-icon svg {
  width: 1.35rem;
  height: 1.35rem;
}

.study-modal-header h3 {
  margin: 0;
  font-size: 1.2rem;
  font-weight: 600;
  color: #0d0d0d;
}

.study-modal-header p {
  margin: 0.35rem 0 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.study-upload-preview,
.study-result-preview {
  display: block;
  width: min(100%, 320px);
  max-height: 220px;
  margin: 0 auto;
  object-fit: contain;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: #ffffff;
}

.study-upload-preview {
  margin-top: 0.25rem;
}

.study-result-preview {
  margin-bottom: 1rem;
}

.study-modal-tabs {
  display: inline-flex;
  gap: 0.25rem;
  margin-bottom: 1.25rem;
  padding: 0.25rem;
  border-radius: 0.65rem;
  background: #f1f5f9;
  border: 1px solid var(--border);
}

.study-modal-tab {
  border: none;
  background: transparent;
  padding: 0.5rem 0.9rem;
  border-radius: 0.5rem;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.study-modal-tab.is-active {
  background: #ffffff;
  color: var(--accent-strong);
  box-shadow: var(--shadow-sm);
}

.study-upload-dialog {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.study-upload-plus {
  display: grid;
  gap: 0.5rem;
  justify-items: center;
  width: 100%;
  padding: 2rem 1.5rem;
  border: 1.5px dashed rgba(0, 0, 0, 0.28);
  border-radius: var(--radius-xl);
  background: #fafbff;
  cursor: pointer;
  transition: border-color 0.15s ease, background-color 0.15s ease;
  font: inherit;
}

.study-upload-plus:hover {
  border-color: rgba(0, 0, 0, 0.45);
  background: #f5f7ff;
}

.study-upload-plus-ring {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 3.5rem;
  height: 3.5rem;
  border-radius: 999px;
  background: #ffffff;
  border: 1px solid rgba(0, 0, 0, 0.15);
  box-shadow: var(--shadow-sm);
}

.study-upload-plus-icon {
  font-size: 1.75rem;
  font-weight: 300;
  line-height: 1;
  color: var(--accent);
}

.study-upload-plus-label {
  font-weight: 600;
  color: #0d0d0d;
  font-size: 0.95rem;
}

.study-upload-plus-hint {
  color: var(--muted);
  font-size: 0.85rem;
}

.study-file-name {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #334155;
  font-size: 0.88rem;
  font-weight: 500;
}

.study-file-selected {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: var(--surface-soft);
}

.study-file-selected-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border-radius: 0.5rem;
  background: #ffffff;
  color: var(--accent);
  flex-shrink: 0;
}

.study-file-selected-icon svg {
  width: 1rem;
  height: 1rem;
}

.study-file-type-badge {
  display: inline-block;
  margin-right: 0.45rem;
  padding: 0.15rem 0.45rem;
  border-radius: 0.35rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  background: var(--accent-soft);
  color: var(--accent-strong);
}

.study-file-type-badge[data-type="image"] {
  background: rgba(59, 130, 246, 0.12);
  color: #1d4ed8;
}

.study-file-type-badge[data-type="pdf"] {
  background: rgba(239, 68, 68, 0.12);
  color: #b91c1c;
}

.study-file-type-badge[data-type="word"] {
  background: rgba(37, 99, 235, 0.12);
  color: #1e40af;
}

.study-file-type-badge[data-type="slides"] {
  background: rgba(234, 88, 12, 0.12);
  color: #c2410c;
}

.study-file-type-badge[data-type="spreadsheet"] {
  background: rgba(22, 163, 74, 0.12);
  color: #15803d;
}

.study-file-type-badge[data-type="text"] {
  background: rgba(100, 116, 139, 0.12);
  color: #475569;
}

.study-detected-types {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.25rem;
}

.study-detected-types-inline {
  margin: 0.5rem 0 0.75rem;
}

.study-type-chip {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.65rem;
  border-radius: 999px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  color: #334155;
  font-size: 0.78rem;
  font-weight: 600;
}

.study-type-chip[data-type="image"] { border-color: rgba(59, 130, 246, 0.25); color: #1d4ed8; }
.study-type-chip[data-type="pdf"] { border-color: rgba(239, 68, 68, 0.25); color: #b91c1c; }
.study-type-chip[data-type="word"] { border-color: rgba(37, 99, 235, 0.25); color: #1e40af; }
.study-type-chip[data-type="slides"] { border-color: rgba(234, 88, 12, 0.25); color: #c2410c; }
.study-type-chip[data-type="spreadsheet"] { border-color: rgba(22, 163, 74, 0.25); color: #15803d; }

.study-auto-detect-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.84rem;
  line-height: 1.5;
}

.study-file-list {
  display: grid;
  gap: 0.5rem;
}

.study-file-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 0.85rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: #ffffff;
}

.study-file-name-only {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  color: #0d0d0d;
  font-size: 0.92rem;
  font-weight: 500;
}

.study-file-row-actions {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  flex-shrink: 0;
}

.study-file-preview-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: none;
  border-radius: 0.5rem;
  background: var(--surface-soft);
  color: #64748b;
  cursor: pointer;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.study-file-preview-btn svg {
  width: 1rem;
  height: 1rem;
}

.study-file-preview-btn:hover {
  background: #eef2ff;
  color: var(--accent-strong);
}

.study-file-preview-modal {
  position: fixed;
  inset: 0;
  z-index: 110;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.25rem;
}

.study-file-preview-modal[hidden] {
  display: none !important;
}

.study-file-preview-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(15, 23, 42, 0.55);
  backdrop-filter: blur(4px);
}

.study-file-preview-dialog {
  position: relative;
  width: min(900px, 100%);
  max-height: calc(100vh - 2.5rem);
  display: grid;
  grid-template-rows: auto 1fr;
  gap: 0.75rem;
  padding: 1.25rem;
  border-radius: 1rem;
  background: #ffffff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lg);
}

.study-file-preview-close {
  position: absolute;
  top: 0.85rem;
  right: 0.85rem;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.25rem;
  height: 2.25rem;
  padding: 0;
  border: none;
  border-radius: 0.5rem;
  background: var(--surface-soft);
  color: #64748b;
  cursor: pointer;
}

.study-file-preview-close svg {
  width: 1rem;
  height: 1rem;
}

.study-file-preview-close:hover {
  background: #eef2ff;
  color: #0d0d0d;
}

.study-file-preview-title {
  margin: 0;
  padding-right: 2.5rem;
  color: #0d0d0d;
  font-size: 1rem;
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.study-file-preview-body {
  min-height: 240px;
  max-height: calc(100vh - 8rem);
  overflow: auto;
  border-radius: 0.75rem;
  border: 1px solid var(--border);
  background: var(--surface-soft);
}

.study-file-preview-image {
  display: block;
  width: 100%;
  max-height: calc(100vh - 10rem);
  object-fit: contain;
  background: #ffffff;
}

.study-file-preview-doc {
  width: 100%;
  height: min(70vh, 720px);
  border: none;
  background: #ffffff;
}

.study-file-preview-text {
  margin: 0;
  padding: 1rem;
  white-space: pre-wrap;
  word-break: break-word;
  color: #334155;
  font-size: 0.9rem;
  line-height: 1.55;
}

.study-file-preview-audio {
  display: block;
  width: min(100%, 480px);
  margin: 1.5rem auto;
}

.study-file-preview-placeholder {
  display: grid;
  gap: 0.5rem;
  padding: 2rem 1.5rem;
  text-align: center;
  color: var(--muted);
}

.study-file-preview-placeholder strong {
  color: #0d0d0d;
  font-size: 1rem;
}

.study-file-preview-placeholder p {
  margin: 0;
  color: #334155;
  font-weight: 500;
}

body.preview-open {
  overflow: hidden;
}

.study-file-page {
  display: block;
  color: var(--accent);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.study-upload-preview-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
  gap: 0.75rem;
}

.study-preview-item {
  margin: 0;
  display: grid;
  gap: 0.35rem;
}

.study-preview-item figcaption {
  color: var(--muted);
  font-size: 0.78rem;
  font-weight: 600;
  text-align: center;
}

.study-upload-preview-grid .study-upload-preview {
  width: 100%;
  height: 120px;
  margin: 0;
  object-fit: cover;
}

.study-result-preview-grid {
  margin-bottom: 1rem;
}

.study-file-remove {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  margin-left: auto;
  padding: 0;
  border: none;
  border-radius: 0.5rem;
  background: #ffffff;
  color: #64748b;
  cursor: pointer;
  flex-shrink: 0;
  transition: background-color 0.15s ease, color 0.15s ease;
}

.study-file-remove svg {
  width: 0.95rem;
  height: 0.95rem;
}

.study-file-remove:hover {
  background: #fee2e2;
  color: #dc2626;
}

.study-upload-plus[hidden],
.study-file-selected[hidden] {
  display: none !important;
}

.study-modal-divider {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 1.25rem 0;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 500;
}

.study-modal-divider::before,
.study-modal-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.study-modal-actions {
  display: flex;
  justify-content: flex-end;
  gap: 0.75rem;
  margin-top: 1.25rem;
  padding-top: 0.25rem;
}

.study-loading {
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.study-visuals {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.study-visuals-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
}

.study-visuals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 1rem;
}

.study-visual-card {
  margin: 0;
  border: 1px solid var(--border, rgba(0, 0, 0, 0.08));
  border-radius: 14px;
  overflow: hidden;
  background: var(--card, #fff);
  display: flex;
  flex-direction: column;
}

.study-visual-card img {
  display: block;
  width: 100%;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  background: #f3f4f6;
}

.study-visual-card figcaption {
  padding: 0.65rem 0.8rem 0.4rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  line-height: 1.35;
}

.study-visual-caption {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text, #111);
}

.study-visual-explain {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--muted, #555);
  line-height: 1.45;
}

.study-visual-audio {
  margin-top: auto;
  padding: 0 0.8rem 0.75rem;
}

.study-visual-play {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  font-size: 0.8rem;
  font-weight: 600;
  padding: 0.4rem 0.7rem;
  border-radius: 999px;
}

.study-visual-play[disabled] {
  opacity: 0.6;
  cursor: default;
}

.study-visual-play-icon {
  font-size: 0.72rem;
  line-height: 1;
}

.study-visuals-empty {
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.5rem 0;
}

.study-visuals-title {
  margin: 0;
  font-size: 1.1rem;
}

.study-visuals-note {
  margin: 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.study-error {
  margin: 0;
  color: #b91c1c;
  font-size: 0.95rem;
  line-height: 1.5;
}

.study-solver-result {
  margin-top: 1.25rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.study-solver-card {
  background: rgba(15, 23, 42, 0.03);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 1rem 1.1rem;
}

.study-solver-head h4 {
  margin: 0 0 0.35rem;
  font-size: 1rem;
}

.study-solver-problem {
  margin: 0;
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text);
}

.study-solver-steps {
  margin-top: 0.75rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.study-solver-steps .study-step:first-child {
  padding-top: 0;
}

.study-solver-answer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 0.85rem;
  padding: 0.85rem 1rem;
  border-radius: 10px;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.12);
}

.study-solver-answer-label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.study-solver-answer-value {
  font-size: 1.25rem;
  color: var(--text);
}

.study-workspace {
  padding: 1.75rem;
}

.study-result {
  margin-top: 1rem;
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  background: var(--surface-soft);
  border: 1px solid var(--border);
}

.study-result h4 {
  margin: 0 0 0.75rem;
  color: #0d0d0d;
}

.study-result ul {
  margin: 0;
  padding-left: 1.25rem;
  color: #334155;
}

.study-result-meta {
  margin: 0.75rem 0 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.study-quiz-item {
  padding: 0.85rem 0;
  border-bottom: 1px solid var(--border);
}

.study-quiz-item:last-child {
  border-bottom: none;
}

.study-step {
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--border);
}

.study-step:last-child {
  border-bottom: none;
}

.study-step p {
  margin: 0.35rem 0 0;
  color: var(--muted);
}

.study-review-section {
  border-top: 1px solid var(--border);
}

.study-review-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
  margin-bottom: 1.5rem;
}

.study-select {
  min-width: 200px;
  padding: 0.65rem 0.85rem;
  border-radius: 0.65rem;
  border: 1px solid var(--border-strong);
  background: #ffffff;
  font: inherit;
  color: #0d0d0d;
}

.dashboard-action-card {
  box-shadow: var(--shadow-sm);
}

.dashboard-action-card:hover {
  box-shadow: var(--shadow-md);
}

.stat-card {
  background: #ffffff;
}

.dashboard-deck-card {
  box-shadow: var(--shadow-sm);
}

.study-solver-section {
  border-top: 1px solid var(--border);
  padding-top: 2rem;
}

.study-solver-panel {
  padding: 1.25rem 1.5rem 1.5rem;
}

.study-solver-panel .study-modal-tabs {
  margin-bottom: 1rem;
}

.study-solver-panel-body {
  margin-top: 0.5rem;
}

.study-solver-upload-zone {
  margin-bottom: 1rem;
}

.study-solver-upload-btn {
  margin-top: 0.75rem;
}

.study-solver-block {
  margin-bottom: 1rem;
}

.study-solver-label {
  display: block;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.35rem;
}

.study-solver-block p {
  margin: 0;
  color: #334155;
  line-height: 1.55;
}

.study-solver-given-list {
  margin: 0;
  padding-left: 1.25rem;
  color: #334155;
}

.study-solver-formula {
  font-weight: 600;
  font-family: ui-monospace, SFMono-Regular, Menlo, monospace;
}

/* Study page — user-friendly layout */
.study-page {
  max-width: 680px;
  margin: 0 auto;
  padding: 1.5rem 1rem 3rem;
}

.study-hero {
  margin-bottom: 1.5rem;
  text-align: center;
}

.study-hero-badge {
  display: inline-block;
  margin: 0 0 0.5rem;
  padding: 0.25rem 0.65rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.78rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.study-hero h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.6rem, 4.5vw, 2.1rem);
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.study-hero-sub {
  margin: 0 auto;
  max-width: 28rem;
  color: var(--muted);
  font-size: 1rem;
  line-height: 1.5;
}

.study-how-steps {
  display: flex;
  gap: 0.5rem;
  margin: 0 0 1.5rem;
  padding: 0;
  list-style: none;
}

.study-how-step {
  flex: 1;
  display: flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.55rem 0.65rem;
  border-radius: 10px;
  background: #fff;
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--muted);
  transition: border-color 0.2s, background 0.2s, color 0.2s;
}

.study-how-step span {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: #f1f5f9;
  font-size: 0.72rem;
  font-weight: 700;
  flex-shrink: 0;
}

.study-how-step.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  color: var(--accent);
}

.study-how-step.is-active span {
  background: var(--accent);
  color: #fff;
}

.study-input-card,
.study-results-card {
  padding: 1.35rem;
  margin-bottom: 1.5rem;
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-sm);
}

.study-card-label,
.study-field-label {
  display: block;
  margin: 0 0 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: #334155;
}

.study-mode-picker {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.6rem;
  margin-bottom: 1.25rem;
}

.study-solver-modes {
  grid-template-columns: repeat(2, 1fr);
  max-width: 320px;
}

.study-mode-card {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.2rem;
  padding: 0.85rem 0.5rem;
  border: 2px solid var(--border);
  border-radius: 14px;
  background: #fff;
  font: inherit;
  text-align: center;
  cursor: pointer;
  transition: border-color 0.15s, box-shadow 0.15s, transform 0.1s;
}

.study-mode-card:hover {
  border-color: rgba(0, 0, 0, 0.35);
}

.study-mode-card.is-active {
  border-color: var(--accent);
  background: var(--accent-soft);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.12);
}

.study-mode-card-icon {
  display: flex;
  color: var(--accent);
}

.study-mode-card-icon svg {
  width: 1.35rem;
  height: 1.35rem;
}

.study-mode-card-title {
  font-size: 0.9rem;
  font-weight: 600;
  color: #0d0d0d;
}

.study-mode-card-desc {
  font-size: 0.75rem;
  color: var(--muted);
}

.study-drop-card {
  border: 2px dashed #cbd5e1;
  border-radius: 16px;
  padding: 2rem 1.25rem;
  text-align: center;
  background: #fafbfc;
  transition: border-color 0.15s, background 0.15s;
}

.study-drop-card.is-dragover {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.study-drop-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.35rem;
  width: 100%;
  border: none;
  background: transparent;
  font: inherit;
  cursor: pointer;
}

.study-drop-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 1.75rem;
  font-weight: 300;
  line-height: 1;
}

.study-drop-title {
  font-weight: 600;
  color: #0d0d0d;
}

.study-drop-hint {
  font-size: 0.85rem;
  color: var(--muted);
}

.study-file-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.85rem 0 0;
  padding: 0;
  list-style: none;
}

.study-file-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.5rem 0.35rem 0.75rem;
  border-radius: 999px;
  background: #f1f5f9;
  font-size: 0.82rem;
  color: #334155;
}

.study-file-chip-remove {
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 1.1rem;
  line-height: 1;
  cursor: pointer;
  padding: 0 0.15rem;
}

.study-mode-tip {
  margin: 0.75rem 0 0;
  font-size: 0.82rem;
  color: var(--muted);
}

.study-text-input,
.study-select {
  width: 100%;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  font: inherit;
  background: #fff;
  transition: border-color 0.15s, box-shadow 0.15s;
}

.study-text-input:focus,
.study-select:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.12);
}

.study-text-input {
  resize: vertical;
  min-height: 130px;
}

.study-upload-audio-stack {
  margin-top: 0.75rem;
  display: grid;
  gap: 0.75rem;
}

.study-audio-layout {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.study-audio-box {
  padding: 1.1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fafbfc;
}

.study-audio-box-title {
  margin: 0 0 0.25rem;
  font-size: 0.95rem;
  font-weight: 600;
}

.study-audio-box-desc {
  margin: 0 0 0.85rem;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.4;
}

.study-recorder-ui {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  text-align: center;
}

.study-recorder-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: #cbd5e1;
}

.study-recorder-dot.is-recording {
  background: #ef4444;
  animation: pulse-rec 1s infinite;
}

@keyframes pulse-rec {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.5; transform: scale(1.15); }
}

.study-recorder-time {
  font-size: 1.75rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  color: #0d0d0d;
}

.study-recorder-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  justify-content: center;
}

.study-record-preview {
  width: 100%;
  margin-top: 0.25rem;
}

.study-audio-pick-btn {
  width: 100%;
}

.study-audio-picked {
  margin: 0.5rem 0 0;
  font-size: 0.82rem;
  color: var(--accent);
  font-weight: 500;
  word-break: break-all;
}

.study-loading-panel {
  display: flex;
  flex-direction: column;
  align-items: stretch;
  gap: 0.65rem;
  margin: 1rem 0;
  padding: 1.25rem 1.35rem;
  border-radius: 14px;
  background: var(--accent-soft);
  text-align: center;
}

.study-loading-progress {
  height: 6px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.15);
  overflow: hidden;
}

.study-loading-progress-bar {
  width: 0%;
  height: 100%;
  border-radius: inherit;
  background: var(--accent);
  transition: width 0.45s ease;
}

.study-loading-steps {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin: 0.25rem 0 0;
  padding: 0;
  list-style: none;
}

.study-loading-steps li {
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.7);
  font-size: 0.72rem;
  font-weight: 600;
  color: var(--muted);
  transition: background 0.2s, color 0.2s;
}

.study-loading-steps li.is-active {
  background: var(--accent);
  color: #fff;
}

.study-loading-steps li.is-done {
  background: rgba(34, 197, 94, 0.15);
  color: #15803d;
}

.study-loading-spinner {
  display: block;
  flex: none;
  box-sizing: border-box;
  width: 2rem;
  height: 2rem;
  border: 3px solid rgba(0, 0, 0, 0.2);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

.study-loading-bar {
  display: block;
  flex: none;
  box-sizing: border-box;
  width: 180px;
  max-width: 70%;
  height: 6px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.12);
  overflow: hidden;
  position: relative;
}

.study-loading-bar::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 40%;
  border-radius: 999px;
  background: var(--accent);
  animation: study-loading-slide 1.1s ease-in-out infinite;
}

@keyframes study-loading-slide {
  0% { left: -40%; }
  100% { left: 100%; }
}

.study-chat-loader {
  margin: 0;
  padding: 0.85rem 1rem;
  gap: 0.5rem;
}

.study-chat-loader .study-loading-title { font-size: 0.85rem; }
.study-chat-loader .study-loading-text { font-size: 0.75rem; }

.study-loading-indeterminate {
  position: relative;
  height: 8px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.12);
  overflow: hidden;
}

.study-loading-indeterminate::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 100%;
  width: 8%;
  border-radius: 999px;
  background: var(--accent);
  animation: study-loading-fillup 9s cubic-bezier(0.22, 0.85, 0.28, 1) forwards;
}

@keyframes study-loading-fillup {
  0%   { width: 6%; }
  50%  { width: 50%; }
  100% { width: 92%; }
}

.study-progress-loader {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 14px 4px 18px;
}

.study-progress-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  font-size: 13px;
  font-weight: 600;
  color: var(--muted);
}

.study-progress-count {
  font-variant-numeric: tabular-nums;
  color: var(--accent);
}

.study-progress-track {
  box-sizing: border-box;
  width: 100%;
  height: 8px;
  border-radius: 999px;
  background: rgba(0, 0, 0, 0.12);
  overflow: hidden;
}

.study-progress-fill {
  height: 100%;
  border-radius: 999px;
  background: var(--accent);
  width: 0;
  transition: width 0.35s ease;
}

.study-loading-title {
  margin: 0;
  font-weight: 600;
  color: #0d0d0d;
}

.study-loading-text {
  margin: 0;
  font-size: 0.88rem;
  color: var(--muted);
}

.study-create-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.15rem;
  width: 100%;
  margin-top: 0.5rem;
  padding: 1rem 1.25rem;
  border-radius: 14px;
  font-size: 1rem;
  box-shadow: 0 4px 14px rgba(0, 0, 0, 0.25);
}

.study-create-btn:disabled {
  opacity: 0.65;
  cursor: not-allowed;
}

.study-create-btn-label {
  font-weight: 600;
}

.study-create-btn-sub {
  font-size: 0.78rem;
  font-weight: 400;
  opacity: 0.85;
}

.study-status-msg {
  margin: 0.75rem 0 0;
  text-align: center;
  font-size: 0.9rem;
  color: var(--muted);
}

.study-status-msg.study-success {
  color: #15803d;
  font-weight: 500;
}

.study-ready-badge {
  display: inline-block;
  margin: 0 0 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: #dcfce7;
  color: #15803d;
  font-size: 0.75rem;
  font-weight: 600;
}

.study-results-top h2 {
  margin: 0 0 0.25rem;
  font-size: 1.2rem;
}

.study-tabs-scroll {
  overflow-x: auto;
  flex-wrap: nowrap;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.study-tabs-scroll::-webkit-scrollbar {
  display: none;
}

.study-tutor-hint {
  margin: 0 0 0.75rem;
  font-size: 0.88rem;
  color: var(--muted);
}

.study-section-head {
  margin-bottom: 1rem;
}

.study-section-head h2 {
  margin: 0 0 0.35rem;
  font-size: 1.15rem;
}

.study-section-head p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
}

.study-solver-card-wrap {
  padding: 1.35rem;
  border-radius: var(--radius-xl);
}

.solver-mode-picker {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.45rem;
  margin-bottom: 1rem;
  max-width: 300px;
}

.solver-mode-picker .study-mode-card {
  padding: 0.5rem 0.55rem;
  border-radius: 10px;
  border-width: 1.5px;
  text-align: left;
  align-items: flex-start;
  gap: 0.05rem;
}

.solver-mode-picker .study-mode-card.is-active {
  box-shadow: 0 0 0 2px rgba(0, 0, 0, 0.1);
}

.solver-mode-picker .study-mode-card-icon {
  margin-bottom: 0.05rem;
}

.solver-mode-picker .study-mode-card-icon svg {
  width: 1rem;
  height: 1rem;
}

.solver-mode-picker .study-mode-card-title {
  font-size: 0.78rem;
  font-weight: 600;
  line-height: 1.25;
}

.solver-mode-picker .study-mode-card-desc {
  font-size: 0.65rem;
  line-height: 1.3;
}

.solver-mode-picker .study-modal-tab {
  border: 2px solid var(--border);
}

.solver-panel {
  animation: solver-panel-in 0.2s ease;
}

@keyframes solver-panel-in {
  from {
    opacity: 0;
    transform: translateY(4px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.solver-problem-input {
  width: 100%;
  min-height: 8.5rem;
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  font: inherit;
  line-height: 1.55;
  resize: none;
  overflow: hidden;
  field-sizing: content;
  background: #fafbfc;
  transition: border-color 0.15s, box-shadow 0.15s, background 0.15s;
}

.solver-problem-input:focus {
  outline: none;
  border-color: var(--accent);
  background: #fff;
  box-shadow: 0 0 0 3px rgba(0, 0, 0, 0.08);
}

.solver-drop-card {
  margin-bottom: 0.25rem;
}

.solver-drop-card .study-drop-icon {
  width: 3.25rem;
  height: 3.25rem;
  font-size: 1.85rem;
}

.study-solver-submit {
  margin-top: 0.75rem;
}

@media (max-width: 640px) {
  .study-how-steps {
    flex-direction: column;
  }

  .study-mode-picker {
    grid-template-columns: 1fr;
  }

  .study-audio-layout {
    grid-template-columns: 1fr;
  }

  .study-solver-modes {
    max-width: none;
  }

  .solver-mode-picker {
    grid-template-columns: 1fr;
  }
}

/* Study session UI */
.study-session-hub .section-heading h1 {
  font-size: clamp(1.75rem, 4vw, 2.35rem);
  margin: 0.35rem 0 0.75rem;
}

.study-upload-card {
  padding: 1.5rem;
  margin-bottom: 1.5rem;
}

.study-upload-zone {
  border: 2px dashed var(--border);
  border-radius: 16px;
  padding: 2rem 1.5rem;
  text-align: center;
  transition: border-color 0.15s, background 0.15s;
}

.study-upload-zone.is-dragover {
  border-color: var(--accent);
  background: rgba(0, 0, 0, 0.04);
}

.study-upload-zone-btn {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  border: none;
  background: transparent;
  cursor: pointer;
  font: inherit;
  color: inherit;
}

.study-upload-zone-label {
  font-weight: 600;
  color: #0d0d0d;
}

.study-upload-zone-hint {
  font-size: 0.88rem;
  color: var(--muted);
}

.study-paste-divider {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin: 1.25rem 0;
  color: var(--muted);
  font-size: 0.85rem;
}

.study-paste-divider::before,
.study-paste-divider::after {
  content: '';
  flex: 1;
  height: 1px;
  background: var(--border);
}

.study-paste-field textarea {
  width: 100%;
  min-height: 100px;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  font: inherit;
  resize: vertical;
}

.study-session-file-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.study-session-file-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.55rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  font-size: 0.9rem;
}

.study-session-file-item .study-file-remove {
  border: none;
  background: transparent;
  font-size: 1.25rem;
  line-height: 1;
  cursor: pointer;
  color: var(--muted);
}

.study-generate-btn {
  width: 100%;
  margin-top: 1.25rem;
}

.study-generate-status {
  margin: 0.75rem 0 0;
  font-size: 0.9rem;
  color: var(--muted);
  text-align: center;
}

.study-results {
  padding: 1.25rem 1.5rem 1.5rem;
}

.study-results-head {
  margin-bottom: 1rem;
}

.study-results-head h2 {
  margin: 0 0 0.35rem;
  font-size: 1.25rem;
}

.study-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 0.75rem;
}

.study-tab {
  border: none;
  background: transparent;
  padding: 0.45rem 0.85rem;
  border-radius: 999px;
  font: inherit;
  font-size: 0.9rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
}

.study-tab.is-active {
  background: rgba(0, 0, 0, 0.1);
  color: var(--accent);
}

.study-tab-panel h3 {
  margin: 0 0 0.75rem;
  font-size: 1.05rem;
}

.study-flashcard-deck {
  margin-top: 0.5rem;
}

.study-flashcard-deck-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.study-quiz-deck-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
  margin-bottom: 1rem;
}

.study-quiz-deck-head-copy {
  min-width: 0;
}

.study-panel-empty {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 0.5rem 0 1rem;
}

.study-flashcard-progress {
  margin: 0 0 0.25rem;
  font-size: 1rem;
  color: var(--text);
}

.study-flashcard-progress strong {
  color: var(--accent-strong);
}

.study-flashcard-stage {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.study-flashcard-viewport {
  flex: 1;
  overflow: visible;
  touch-action: pan-y;
  border-radius: var(--radius-xl);
  perspective: 1200px;
}

.study-flashcard-viewport .study-flashcard {
  width: 100%;
}

.study-flashcard-hint {
  margin: 0.75rem 0 0;
  text-align: center;
  font-size: 0.78rem;
  color: var(--muted-light);
}

.study-flashcard-track {
  display: flex;
  will-change: transform;
}

.study-flashcard-slide {
  flex: 0 0 100%;
  min-width: 100%;
  padding: 0 0.15rem;
  box-sizing: border-box;
}

.study-flashcard-nav {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2.5rem;
  height: 2.5rem;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: #fff;
  color: var(--text);
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.study-flashcard-nav svg {
  width: 1.25rem;
  height: 1.25rem;
}

.study-flashcard-nav:hover:not(:disabled) {
  border-color: var(--accent);
  color: var(--accent-strong);
  background: var(--accent-soft);
}

.study-flashcard-nav:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.study-flashcard-dots {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 0.4rem;
  margin-top: 1rem;
  padding: 0 0.5rem;
}

.study-flashcard-dot {
  width: 0.5rem;
  height: 0.5rem;
  padding: 0;
  border: none;
  border-radius: 50%;
  background: var(--border-strong);
  cursor: pointer;
  transition: transform 0.15s, background 0.15s;
}

.study-flashcard-dot.is-active {
  background: var(--accent);
  transform: scale(1.25);
}

.study-flashcard-dot:hover {
  background: var(--accent-strong);
}

.study-flashcard-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.study-flashcard {
  position: relative;
  display: flex;
  flex-direction: column;
  align-items: stretch;
  justify-content: flex-start;
  width: 100%;
  min-height: 220px;
  height: auto;
  padding: 1.5rem 1.25rem;
  border: 1px solid rgba(99,102,241,0.12);
  border-radius: var(--radius-xl);
  background: #fff;
  box-shadow: 0 8px 24px rgba(99,102,241,0.12);
  cursor: pointer;
  text-align: left;
  font: inherit;
  transition: box-shadow 0.15s, border-color 0.15s;
}

.study-flashcard:hover {
  border-color: var(--accent);
  box-shadow: 0 12px 28px rgba(99,102,241,0.12);
}

.study-flashcard-label {
  display: inline-block;
  align-self: flex-start;
  margin-bottom: 0.65rem;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-size: 0.72rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.study-flashcard-inner {
  position: relative;
  width: 100%;
  min-height: 140px;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
  transition: transform 0.45s cubic-bezier(0.4, 0.2, 0.2, 1);
}

.study-flashcard.is-flipped .study-flashcard-inner {
  transform: rotateY(180deg);
}

.study-flashcard-face,
.study-flashcard-front,
.study-flashcard-back {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 100%;
  min-height: 140px;
  padding: 0.25rem;
  font-size: 1.05rem;
  line-height: 1.55;
  color: var(--text);
  white-space: normal;
  word-break: break-word;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transform-style: preserve-3d;
  -webkit-transform-style: preserve-3d;
}

.study-flashcard-front {
  transform: rotateY(0deg);
}

.study-flashcard-back {
  transform: rotateY(180deg);
  color: var(--accent-strong);
  font-weight: 500;
}

.study-flashcard:not(.is-flipped) .study-flashcard-front {
  opacity: 1;
  visibility: visible;
}

.study-flashcard:not(.is-flipped) .study-flashcard-back {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.study-flashcard.is-flipped .study-flashcard-front {
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
}

.study-flashcard.is-flipped .study-flashcard-back {
  opacity: 1;
  visibility: visible;
}

.study-quiz-deck {
  margin-top: 0.5rem;
}

.study-quiz-deck-head .study-quiz-progress {
  margin: 0.25rem 0 0;
}

.study-flashcard-viewport .study-quiz-card {
  width: 100%;
  min-height: 280px;
  box-sizing: border-box;
}

.study-flashcard-dot.is-answered:not(.is-active) {
  background: rgba(22, 163, 74, 0.45);
}

.study-quiz-footer {
  margin-top: 1.25rem;
  text-align: center;
}

.study-quiz-options {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin: 1rem 0;
}

.study-quiz-list {
  display: grid;
  gap: 1rem;
}

.study-quiz-card {
  padding: 1rem 1.1rem;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: #fff;
}

.study-quiz-question {
  margin: 0 0 0.75rem;
  font-size: 1.02rem;
  font-weight: 600;
  line-height: 1.55;
  white-space: normal;
  word-break: break-word;
}

.study-quiz-progress {
  margin-top: 1rem;
}

.study-quiz-option {
  text-align: left;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: #fff;
  font: inherit;
  cursor: pointer;
  white-space: normal;
  word-break: break-word;
  line-height: 1.45;
}

.study-quiz-option:hover:not(:disabled) {
  border-color: var(--accent);
}

.study-quiz-option.is-correct {
  border-color: #16a34a;
  background: rgba(22, 163, 74, 0.08);
}

.study-quiz-option.is-wrong {
  border-color: #dc2626;
  background: rgba(220, 38, 38, 0.06);
}

.study-quiz-option:disabled {
  cursor: default;
}

.study-quiz-feedback {
  margin: 0.5rem 0 0.75rem;
  font-weight: 500;
}

.study-quiz-score {
  font-size: 1.1rem;
  margin: 0.5rem 0 1rem;
}

.study-tutor-panel {
  display: flex;
  flex-direction: column;
  min-height: 320px;
}

.tutor-messages {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1rem;
  max-height: 360px;
  padding-right: 0.25rem;
}

.tutor-message {
  max-width: 88%;
  padding: 0.75rem 1rem;
  border-radius: 14px;
  font-size: 0.95rem;
}

.tutor-message p {
  margin: 0;
}

.tutor-message-user {
  align-self: flex-end;
  background: transparent;
  color: var(--text);
  border: 1px solid var(--border);
}

.tutor-message-bot {
  align-self: flex-start;
  background: var(--surface-soft);
  color: var(--text);
  border: 1px solid var(--border);
}

.tutor-cite {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 1.15em;
  height: 1.15em;
  padding: 0 0.3em;
  margin: 0 0.15em;
  border-radius: 999px;
  background: var(--cta-gradient);
  color: #fff;
  font-size: 0.62em;
  font-weight: 700;
  line-height: 1;
  vertical-align: super;
  cursor: default;
}

.tutor-citations {
  margin-top: 0.55rem;
  border-top: 1px dashed var(--border);
  padding-top: 0.45rem;
}

.tutor-citations > summary {
  cursor: pointer;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-muted, #6b7280);
  list-style: none;
  user-select: none;
}

.tutor-citations > summary::-webkit-details-marker {
  display: none;
}

.tutor-citations > summary::before {
  content: '▸';
  display: inline-block;
  margin-right: 0.4rem;
  transition: transform 0.15s ease;
}

.tutor-citations[open] > summary::before {
  transform: rotate(90deg);
}

.tutor-citations-list {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.5rem;
}

.tutor-citation {
  display: flex;
  gap: 0.5rem;
  align-items: flex-start;
  font-size: 0.82rem;
  line-height: 1.45;
  color: var(--text);
  background: var(--surface, #fff);
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 0.5rem 0.65rem;
}

.tutor-citation-num {
  flex: 0 0 auto;
  min-width: 1.35em;
  height: 1.35em;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: 999px;
  background: var(--cta-gradient);
  color: #fff;
  font-size: 0.72rem;
  font-weight: 700;
}

.tutor-citation-text {
  flex: 1;
}

.tutor-form {
  display: flex;
  gap: 0.5rem;
}

.tutor-form input {
  flex: 1;
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  border-radius: 12px;
  font: inherit;
}

.tutor-message-typing p {
  opacity: 0.65;
  font-style: italic;
}

.study-interview-panel {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.study-interview-options {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
}

.study-interview-option:first-child {
  grid-column: 1 / -1;
}

.study-interview-option {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
}

.study-interview-actions {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.interview-action-bar {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
}

.interview-action-btn {
  width: auto;
  flex: 0 0 auto;
  white-space: nowrap;
}

.interview-action-reset {
  margin-top: 0;
  flex: 0 0 auto;
}

.study-interview-form {
  flex: 1 1 auto;
  width: 100%;
}

.interview-message-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.2rem;
}

.interview-step-label {
  margin: 0.35rem 0 0.75rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: #0d9488;
}

.study-required {
  color: #dc2626;
}

.study-interview-setup-card {
  padding: 0;
  border: none;
  background: transparent;
  margin-bottom: 0.75rem;
}

.interview-session-meta {
  margin: 0 0 0.65rem;
}

.interview-review {
  margin-top: 0.5rem;
  padding-top: 0.85rem;
  border-top: 1px solid rgba(15, 23, 42, 0.08);
}

.interview-review-title {
  margin: 0 0 0.35rem;
  font-size: 1rem;
  font-weight: 650;
}

.interview-review-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-top: 0.75rem;
}

.interview-review-card {
  padding: 0.85rem 0.95rem;
  border-radius: 0.85rem;
  border: 1px solid rgba(15, 23, 42, 0.08);
  background: #f8fafc;
}

.interview-review-label {
  display: block;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 0.25rem;
}

.interview-review-q,
.interview-review-your,
.interview-review-suggested {
  margin: 0 0 0.65rem;
  font-size: 0.92rem;
  line-height: 1.45;
}

.interview-review-suggested {
  margin-bottom: 0;
  padding-top: 0.55rem;
  border-top: 1px dashed rgba(15, 23, 42, 0.12);
}

.interview-review-suggested .interview-review-label {
  color: #0d9488;
}

.tutor-message-feedback {
  border-left: 3px solid #f59e0b;
}

.tutor-form button:disabled,
.tutor-form input:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

@media (max-width: 720px) {
  .study-flashcard-stage {
    gap: 0.35rem;
  }

  .study-flashcard-nav {
    width: 2.15rem;
    height: 2.15rem;
  }

  .study-flashcard {
    min-height: 180px;
    padding: 1.15rem 1rem;
  }

  .tutor-form {
    flex-direction: column;
  }
}

/* Landing + study UI */
.hero-mg {
  padding: 4rem 0 2.5rem;
  background: var(--hero-tint);
  color: var(--text);
  border-bottom: 1px solid var(--border);
}

.hero-mg-grid {
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  gap: 2.5rem;
  align-items: center;
}

.hero-mg-copy h1 {
  margin: 0.75rem 0 1rem;
  font-size: clamp(2rem, 4.5vw, 3rem);
  line-height: 1.1;
  letter-spacing: -0.03em;
  color: var(--text);
}

.hero-mg-copy p {
  color: var(--muted);
  font-size: 1.1rem;
  max-width: 34rem;
}

.hero-pill {
  display: inline-block;
  padding: 0.35rem 0.75rem;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid rgba(99,102,241,0.12);
  font-size: 0.8rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--accent-strong);
}

.hero-trust {
  margin-top: 1.25rem;
  font-size: 0.88rem;
  color: var(--muted-light);
}

.hero-mg-preview {
  padding: 1.5rem;
  background: #fff;
  color: var(--text);
  border: 1px solid rgba(99,102,241,0.12);
  box-shadow: 0 8px 24px rgba(99,102,241,0.12);
  border-radius: var(--radius-xl);
}

.hero-preview-label {
  margin: 0;
  font-size: 0.78rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--muted);
}

.hero-preview-title {
  margin: 0.35rem 0 1rem;
  font-size: 1.15rem;
}

.hero-preview-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.75rem;
  margin-top: 1.25rem;
  padding-top: 1rem;
  border-top: 1px solid var(--border);
}

.hero-preview-stats strong {
  display: block;
  font-size: 1.35rem;
  color: var(--accent);
}

.hero-preview-stats span {
  font-size: 0.78rem;
  color: var(--muted);
}

.file-type-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-top: 2rem;
}

.file-type-chip {
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  background: var(--accent-soft);
  border: 1px solid rgba(99,102,241,0.12);
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent-strong);
}

.mg-feature-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
}

.mg-feature-card {
  padding: 1.5rem;
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, transform 0.2s;
}

.mg-feature-card:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
  border-color: rgba(99,102,241,0.12);
}

.mg-feature-icon {
  font-size: 1.75rem;
  display: block;
  margin-bottom: 0.75rem;
}

.mg-feature-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.mg-feature-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.92rem;
  line-height: 1.5;
}

.mg-steps-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.mg-step-card {
  padding: 1.25rem;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border);
}

.mg-step-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  margin-bottom: 0.75rem;
  border-radius: 50%;
  background: var(--accent-soft);
  color: var(--accent);
  font-weight: 700;
  font-size: 0.9rem;
}

.mg-step-card h3 {
  margin: 0 0 0.4rem;
  font-size: 1rem;
}

.mg-step-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.88rem;
}

.center-cta {
  text-align: center;
}

.science-row {
  display: grid;
  grid-template-columns: 1fr 1.2fr;
  gap: 2rem;
  align-items: start;
}

.science-cards {
  display: grid;
  gap: 0.75rem;
}

.science-card {
  display: grid;
  gap: 0.2rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border);
}

.science-card strong {
  color: var(--text);
}

.science-card span {
  color: var(--muted);
  font-size: 0.9rem;
}

/* Study workspace session flow */
.study-ws-header {
  margin-bottom: 1.5rem;
}

.study-ws-eyebrow {
  margin: 0 0 0.35rem;
  font-size: 0.8rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}

.study-ws-header h1 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  letter-spacing: -0.02em;
}

.study-ws-sub {
  margin: 0;
  color: var(--muted);
  max-width: 36rem;
}

.study-session-card {
  margin-bottom: 2rem;
  padding: 1.5rem;
}

.study-field-label {
  display: block;
  margin-bottom: 0.5rem;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text);
}

.study-session-name {
  width: 100%;
  padding: 0.75rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 12px;
  font: inherit;
  margin-bottom: 1.25rem;
}

.file-type-picker {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.file-type-btn {
  flex: 1;
  min-width: 7rem;
  padding: 0.65rem 1rem;
  border: 1px solid var(--border-strong);
  border-radius: 999px;
  background: #fff;
  font: inherit;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}

.file-type-btn:hover {
  border-color: var(--accent);
  color: var(--accent);
}

.file-type-btn.is-active {
  background: var(--cta-gradient);
  border-color: transparent;
  color: #fff;
  box-shadow: 0 2px 8px rgba(99,102,241,0.12);
}

.study-kit-includes {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.65rem;
  margin: 1.25rem 0;
  padding: 0.85rem 1rem;
  border-radius: 12px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
}

.study-kit-label {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--muted);
}

.study-kit-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.study-kit-tags span {
  padding: 0.25rem 0.6rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text);
}

.study-create-btn {
  width: 100%;
  padding: 0.9rem 1.25rem;
  font-size: 1rem;
}

.study-results-card {
  margin-bottom: 2.5rem;
  padding: 1.5rem;
}

.study-ready-badge {
  display: inline-block;
  margin: 0 0 0.35rem;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: rgba(34, 197, 94, 0.12);
  color: #15803d;
  font-size: 0.75rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.session-checklist {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.session-checklist-demo .session-check-item {
  cursor: default;
}

.session-check-item {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.45rem 0.75rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #fff;
  font: inherit;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--muted);
  cursor: pointer;
  transition: all 0.15s;
}

.session-check-item .check-icon {
  font-size: 0.75rem;
  width: 1rem;
  text-align: center;
}

.session-check-item.is-done {
  border-color: rgba(34, 197, 94, 0.35);
  background: rgba(34, 197, 94, 0.08);
  color: #15803d;
}

.session-check-item.is-pending {
  border-color: rgba(59, 130, 246, 0.35);
  background: rgba(59, 130, 246, 0.08);
  color: #1d4ed8;
}

.session-check-item.is-active {
  border-color: #0d0d0d;
  background: #ececec;
  color: #0d0d0d;
  font-weight: 600;
}

.study-ai-banner {
  margin-bottom: 0.75rem;
  padding: 0.65rem 0.85rem;
  border-radius: 10px;
  background: rgba(245, 158, 11, 0.12);
  border: 1px solid rgba(245, 158, 11, 0.35);
  color: #92400e;
  font-size: 0.86rem;
  line-height: 1.45;
}

.mg-dash-ai-banner {
  margin: 0 0 1rem;
  max-width: 52rem;
}

.ai-setup-steps {
  margin: 0 0 1rem;
  padding-left: 1.2rem;
  line-height: 1.55;
  color: var(--text, #334155);
}

.ai-setup-steps li + li {
  margin-top: 0.45rem;
}

.ai-setup-env-list {
  margin: 0 0 1rem;
  padding: 0.65rem 0.85rem;
  list-style: none;
  background: #f8fafc;
  border: 1px solid #e2e8f0;
  border-radius: 8px;
  font-size: 0.84rem;
  font-family: ui-monospace, monospace;
}

.ai-setup-env-list li {
  display: flex;
  justify-content: space-between;
  gap: 0.5rem;
  padding: 0.2rem 0;
}

.ai-setup-env-list .is-missing {
  color: #b45309;
}

.ai-setup-env-list .is-ok {
  color: #15803d;
}

.ai-setup-terminal code {
  font-size: 0.8rem;
}

.ai-setup-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.session-check-item:hover:not(.session-checklist-demo .session-check-item) {
  border-color: var(--accent);
  color: var(--accent);
}

.study-tabs-scroll {
  overflow-x: auto;
  flex-wrap: nowrap;
  -webkit-overflow-scrolling: touch;
}

.dashboard-sessions-panel {
  margin-bottom: 1.5rem;
}

.dashboard-session-list {
  display: grid;
  gap: 0.65rem;
}

.dashboard-session-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border);
}

.dashboard-session-copy {
  display: grid;
  gap: 0.2rem;
  min-width: 0;
}

.dashboard-session-copy strong {
  font-size: 0.95rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.dashboard-session-copy span {
  font-size: 0.82rem;
  color: var(--muted);
}

.dashboard-session-date {
  font-size: 0.78rem !important;
}

@media (max-width: 900px) {
  .hero-mg-grid {
    grid-template-columns: 1fr;
  }

  .mg-feature-grid {
    grid-template-columns: 1fr 1fr;
  }

  .mg-steps-grid {
    grid-template-columns: 1fr 1fr;
  }

  .science-row {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .mg-feature-grid,
  .mg-steps-grid {
    grid-template-columns: 1fr;
  }

  .file-type-btn {
    flex: 1 1 100%;
  }
}

/* App shell + dashboard */
.app-layout-mg {
  background: var(--page-gradient);
}

.app-layout-mg .app-sidebar {
  background: #ffffff;
  border-right: 1px solid var(--border);
  box-shadow: none;
}

.app-layout-mg .app-main {
  background: transparent;
}

/* Study page — same layout as landing “Start my free study session” */
.study-page-mg {
  background: var(--page-gradient);
  min-height: 100vh;
}

.study-page-mg .topbar {
  position: relative;
  z-index: 10;
}

.study-page-hero {
  padding-bottom: 3rem;
}

.study-form-card .hero-preview-title.study-form-heading {
  margin: 0.25rem 0 1.25rem;
  font-size: 1.35rem;
  font-weight: 700;
  line-height: 1.25;
  color: var(--text);
}

.study-form-card .study-field-label-muted {
  margin-bottom: 0.4rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--muted);
}

.study-results-heading {
  margin: 0.2rem 0 0.35rem;
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1.25;
}

.study-results-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.study-success-banner {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.75rem;
  padding: 0.55rem 0.85rem;
  border-radius: 10px;
  background: rgba(99,102,241,0.12);
  border: 1px solid rgba(99,102,241,0.12);
}

.study-success-banner p {
  margin: 0;
  font-size: 0.88rem;
  font-weight: 600;
  color: #0d7a5f;
}

.study-success-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 700;
  flex-shrink: 0;
}

.study-results-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

#study-delete-session-btn {
  color: #dc2626;
  border-color: rgba(220, 38, 38, 0.35);
}

#study-delete-session-btn:hover {
  background: rgba(220, 38, 38, 0.06);
}

body.study-has-session #study-session {
  display: none;
}

body.study-has-session[data-page="dashboard"] [data-dash-panel] {
  display: none !important;
}

body.study-has-session .study-below,
body.study-has-session .study-dash-workspace {
  padding-top: 0;
}

body.study-has-session .study-dash-workspace {
  display: block;
}

.study-dash-workspace[hidden] {
  display: none !important;
}

body.study-has-session .study-results-card {
  max-width: 52rem;
  margin: 0 auto;
}

.study-form-card {
  margin-bottom: 0;
  max-height: none;
  overflow: visible;
}

.study-form-card .study-field-compact {
  margin-bottom: 1rem;
}

.study-form-card .study-session-name {
  margin-bottom: 0;
}

.study-below {
  padding: 2.5rem 1.5rem 4rem;
  background: var(--page-bg-soft);
}

.study-page-mg .study-results-card,
.study-page-mg .study-solver-card-wrap {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.study-page-mg .file-type-btn.is-active {
  background: var(--cta-gradient);
  border-color: transparent;
}

.study-page-mg .study-create-btn {
  margin-top: 0.25rem;
}

.nav-links .button-primary.nav-cta-btn.is-current {
  background: var(--cta-hover);
  box-shadow: none;
}

.study-page-mg .study-solver-section {
  margin-top: 2.5rem;
}

.app-layout-mg .study-session-card,
.app-layout-mg .study-results-card,
.app-layout-mg .study-solver-card-wrap {
  border-color: var(--border);
  box-shadow: var(--shadow-sm);
}

.app-layout-mg .file-type-btn.is-active {
  background: var(--cta-gradient);
  border-color: transparent;
}

.app-layout-mg .study-create-btn {
  background: var(--cta-gradient);
  border: none;
}

body[data-page="home"] {
  background: var(--page-gradient) !important;
}

body[data-page="home"] .section:not(.hero-mg) {
  background: transparent;
}

.mg-feature-card,
.mg-step-card,
.mg-progress-card,
.product-card {
  border-color: var(--border);
}

.mg-sidebar .mg-sidebar-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  margin: 0.25rem 0.85rem 1rem;
  padding: 0.72rem 1rem;
  border-radius: 12px;
  text-decoration: none;
  font-size: 0.88rem;
  font-weight: 600;
  background: var(--cta-gradient);
  border: none;
  color: #fff;
  box-shadow: 0 10px 22px -12px rgba(79, 70, 229, 0.7);
  transition: transform 0.15s ease, box-shadow 0.15s ease;
}

.mg-sidebar .mg-sidebar-cta:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 26px -12px rgba(79, 70, 229, 0.8);
}

.mg-sidebar .mg-sidebar-cta svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

body[data-page="dashboard"] .app-main {
  background:
    radial-gradient(1100px 460px at 88% -10%, rgba(59, 130, 246, 0.18), transparent 55%),
    radial-gradient(900px 420px at 12% 0%, rgba(99, 102, 241, 0.14), transparent 60%),
    var(--page-gradient);
}

.mg-dashboard {
  width: min(1080px, calc(100% - 3rem));
  max-width: none;
  padding: 0 0 3.5rem;
}

.mg-dash-hero {
  position: relative;
  overflow: hidden;
  display: grid;
  gap: 1.5rem;
  margin: 1.75rem 0;
  padding: 2.35rem 2.4rem 2.5rem;
  background: linear-gradient(135deg, #4f46e5 0%, #6366f1 46%, #7c3aed 100%);
  color: #fff;
  border: none;
  border-radius: var(--radius-xl);
  box-shadow: 0 20px 44px -20px rgba(79, 70, 229, 0.6);
}

.mg-dash-hero::after {
  content: "";
  position: absolute;
  top: -42%;
  right: -8%;
  width: 420px;
  height: 420px;
  background: radial-gradient(circle, rgba(255, 255, 255, 0.22), transparent 62%);
  pointer-events: none;
}

.mg-dash-hero-copy,
.mg-dash-hero-actions {
  position: relative;
  z-index: 1;
}

.mg-dash-greeting {
  margin: 0 0 0.5rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: rgba(255, 255, 255, 0.82);
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.mg-dash-hero h1 {
  margin: 0 0 0.7rem;
  font-size: clamp(1.65rem, 3.6vw, 2.3rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
  max-width: 30rem;
  color: #fff;
}

.mg-dash-hero-copy p:last-child {
  margin: 0;
  color: rgba(255, 255, 255, 0.88);
  font-size: 1.02rem;
  line-height: 1.55;
  max-width: 34rem;
}

.mg-dash-hero-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
}

.mg-dash-cta {
  white-space: nowrap;
}

.mg-dash-hero .mg-dash-cta.button-primary {
  background: #fff;
  color: var(--accent-strong);
  border: none;
  box-shadow: 0 10px 24px -10px rgba(15, 23, 42, 0.45);
}

.mg-dash-hero .mg-dash-cta.button-primary:hover {
  background: #f5f3ff;
  color: var(--accent-strong);
  transform: translateY(-1px);
}

.mg-dash-search-wrap {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 1;
  min-width: 200px;
  max-width: 340px;
  padding: 0.55rem 1rem;
  border-radius: 999px;
  background: #fff;
  border: 1px solid var(--border);
}

.mg-dash-search-wrap svg {
  width: 1rem;
  height: 1rem;
  color: var(--muted-light);
  flex-shrink: 0;
}

.mg-dash-search-wrap input {
  flex: 1;
  border: none;
  background: transparent;
  font: inherit;
  font-size: 0.9rem;
  color: var(--text);
  outline: none;
}

.mg-dash-search-wrap input::placeholder {
  color: var(--muted-light);
}

.mg-dash-stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.mg-stat-card {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.95rem;
  padding: 1.15rem 1.25rem;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.mg-stat-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--border-strong);
}

.mg-stat-card-accent {
  border-color: rgba(249, 115, 22, 0.32);
  background: linear-gradient(180deg, #fff 0%, rgba(249, 115, 22, 0.05) 100%);
}

.mg-stat-card-accent strong {
  color: #ea580c;
}

.mg-stat-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.75rem;
  height: 2.75rem;
  border-radius: 14px;
  flex-shrink: 0;
}

.mg-stat-icon svg {
  width: 1.2rem;
  height: 1.2rem;
}

.mg-stat-icon-sessions {
  background: rgba(0, 0, 0, 0.1);
  color: var(--accent);
}

.mg-stat-icon-cards {
  background: rgba(14, 165, 233, 0.1);
  color: #0284c7;
}

.mg-stat-icon-due {
  background: rgba(249, 115, 22, 0.1);
  color: #ea580c;
}

.mg-stat-icon-folders {
  background: rgba(34, 197, 94, 0.1);
  color: #16a34a;
}

.mg-stat-card strong {
  display: block;
  font-size: 1.7rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: #0d0d0d;
}

.mg-stat-card > div > span:last-child {
  font-size: 0.8rem;
  color: var(--muted);
  font-weight: 500;
}

.app-sidebar-nav-label {
  margin: 0.35rem 0.55rem 0.15rem;
  font-size: 0.68rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: #94a3b8;
}

.mg-dash-quick {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.85rem;
  margin-bottom: 2rem;
}

.dash-link-field {
  margin-bottom: 0.35rem;
}

.study-generate-options {
  margin: 1rem 0 0.85rem;
}

.study-generate-hint {
  margin: 0.2rem 0 0.55rem;
  font-size: 0.82rem;
}

.study-original-panel {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.study-original-file,
.study-original-label {
  margin: 0;
}

.study-original-label {
  font-size: 0.82rem;
  color: rgba(15, 23, 42, 0.62);
}

.study-original-file {
  font-size: 0.92rem;
}

.study-original-title {
  margin: 0;
}

.study-original-meta {
  margin: 0;
}

.study-original-body {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  margin: 0;
}

.study-original-topic {
  margin: 0;
  padding: 1rem 1.1rem 1.05rem;
  border-radius: 14px;
  background: rgba(15, 23, 42, 0.035);
  border: 1px solid rgba(15, 23, 42, 0.07);
}

.study-original-topic + .study-original-topic {
  margin-top: 0.15rem;
}

.study-original-topic-title {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  line-height: 1.45;
  color: #0f172a;
}

.study-original-topic-body {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.72;
  color: rgba(15, 23, 42, 0.88);
}

.study-original-topic-body .katex {
  font-size: 1em;
}

.study-original-block + .study-original-block {
  margin-top: 0.85rem;
}

.study-original-body,
.study-original-block {
  margin: 0;
  line-height: 1.72;
}

.study-original-para {
  margin: 0 0 0.9rem;
  line-height: 1.72;
  white-space: pre-wrap;
  word-break: break-word;
}

.study-original-para:last-child {
  margin-bottom: 0;
}

.study-original-text {
  margin: 0;
  padding: 1rem 1.1rem;
  border-radius: 12px;
  background: rgba(15, 23, 42, 0.04);
  white-space: pre-wrap;
  word-break: break-word;
  font: inherit;
  line-height: 1.55;
  max-height: 70vh;
  overflow: auto;
}

.study-original-link {
  margin: 0;
}

.study-youtube-trigger,
.mg-session-youtube-trigger {
  background: none;
  border: none;
  padding: 0;
  font: inherit;
  color: inherit;
  text-align: left;
  cursor: pointer;
  text-decoration: underline;
}

.study-youtube-trigger:hover,
.mg-session-youtube-trigger:hover {
  color: var(--accent, #0d9488);
}

.study-youtube-embed-wrap {
  width: 100%;
  margin-top: 0.65rem;
  border-radius: 12px;
  overflow: hidden;
  background: #0f172a;
  aspect-ratio: 16 / 9;
}

.study-youtube-embed-wrap iframe {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.mg-session-origin-youtube {
  flex-direction: column;
  align-items: stretch;
}

.study-original-youtube {
  margin-bottom: 0.75rem;
}

.study-original-youtube-only {
  margin-bottom: 0;
}

.study-original-panel-youtube .study-original-title {
  margin-bottom: 0.65rem;
}

.study-original-panel-youtube .study-youtube-embed-wrap {
  margin-top: 0;
}

.study-original-audio {
  width: 100%;
}

.study-generate-pick input:disabled {
  opacity: 1;
}

.dash-interview-setup {
  margin-bottom: 0.75rem;
}

.dash-podcast-setup {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
}

.dash-podcast-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.dash-podcast-tab {
  padding: 0.38rem 0.72rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #fff;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 600;
  cursor: pointer;
  transition: border-color 0.15s, color 0.15s, background 0.15s;
}

.dash-podcast-tab.is-active {
  border-color: rgba(13, 148, 136, 0.45);
  background: rgba(13, 148, 136, 0.08);
  color: #0d9488;
}

.dash-podcast-source-panel {
  display: none;
  flex-direction: column;
  gap: 0.5rem;
}

.dash-podcast-source-panel.is-active {
  display: flex;
}

.dash-podcast-source-panel[hidden] {
  display: none !important;
}

.dash-podcast-style-field {
  margin-top: 0.15rem;
}

.dash-session-modal.is-interview-only #dash-session-name-wrap,
.dash-session-modal.is-interview-only #dash-input-tabs,
.dash-session-modal.is-interview-only .study-mode-panel:not([data-dash-mode-panel="interview"]),
.dash-session-modal.is-interview-only .study-generate-options,
.dash-session-modal.is-podcast-only #dash-session-name-wrap,
.dash-session-modal.is-podcast-only #dash-input-tabs,
.dash-session-modal.is-podcast-only .study-mode-panel:not([data-dash-mode-panel="podcast"]),
.dash-session-modal.is-podcast-only .study-generate-options {
  display: none !important;
}

.dash-input-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.85rem 0 1rem;
}

.dash-input-tab {
  padding: 0.38rem 0.72rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: #f8fafc;
  color: var(--text);
  font: inherit;
  font-size: 0.8rem;
  font-weight: 500;
  cursor: pointer;
  transition: border-color 0.15s, background 0.15s, color 0.15s;
}

.dash-input-tab:hover {
  border-color: rgba(99,102,241,0.12);
}

.dash-input-tab.is-active {
  border-color: rgba(99,102,241,0.12);
  background: rgba(99,102,241,0.12);
  color: var(--accent-strong);
}

.dash-paste-section {
  margin-top: 0.85rem;
}

.dash-paste-text {
  min-height: 7rem;
  resize: vertical;
}

.study-audio-box.is-emphasis {
  border-color: rgba(99,102,241,0.12);
  background: rgba(99,102,241,0.12);
  box-shadow: 0 0 0 1px rgba(99,102,241,0.12);
}

.study-generate-picks {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.45rem;
}

.study-podcast-style-field {
  margin-top: 0.85rem;
  max-width: 280px;
}

.study-generate-pick {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.4rem 0.75rem;
  border-radius: 999px;
  border: 1px solid var(--border);
  background: #f8fafc;
  font-size: 0.82rem;
  font-weight: 500;
  color: #0d0d0d;
  cursor: pointer;
  user-select: none;
  transition: border-color 0.15s, background 0.15s;
}

.study-generate-pick:has(input:checked) {
  border-color: rgba(99,102,241,0.12);
  background: rgba(99,102,241,0.12);
}

.study-generate-pick input {
  width: 0.95rem;
  height: 0.95rem;
  margin: 0;
  accent-color: var(--accent);
}

#dash-audio-layout.is-single-column {
  grid-template-columns: 1fr;
}

.mg-quick-card {
  position: relative;
  display: grid;
  gap: 0.3rem;
  padding: 1.3rem 1.35rem 1.4rem;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border);
  text-decoration: none;
  text-align: left;
  color: inherit;
  cursor: pointer;
  font: inherit;
  transition: border-color 0.16s ease, box-shadow 0.16s ease, transform 0.16s ease;
}

.mg-quick-card::before {
  content: "";
  position: absolute;
  inset: 0;
  border-radius: inherit;
  padding: 1px;
  background: linear-gradient(135deg, rgba(99, 102, 241, 0.5), rgba(124, 58, 237, 0.35));
  opacity: 0;
  transition: opacity 0.16s ease;
  pointer-events: none;
}

@supports ((-webkit-mask-composite: xor) or (mask-composite: exclude)) {
  .mg-quick-card::before {
    -webkit-mask: linear-gradient(#000 0 0) content-box, linear-gradient(#000 0 0);
    -webkit-mask-composite: xor;
    mask-composite: exclude;
  }
}

.mg-quick-card:hover {
  border-color: var(--accent);
  box-shadow: 0 16px 32px -18px rgba(79, 70, 229, 0.5);
  transform: translateY(-3px);
}

.mg-quick-card:hover::before {
  opacity: 1;
}

@supports ((-webkit-mask-composite: xor) or (mask-composite: exclude)) {
  .mg-quick-card:hover {
    border-color: transparent;
  }
}

.mg-quick-card-btn {
  width: 100%;
}

.mg-quick-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2.9rem;
  height: 2.9rem;
  margin-bottom: 0.55rem;
  border-radius: 14px;
  font-size: 1.5rem;
  line-height: 1;
  background: linear-gradient(135deg, var(--accent-soft), var(--accent-tint));
  box-shadow: inset 0 0 0 1px rgba(99, 102, 241, 0.14);
}

.mg-quick-card strong {
  font-size: 0.95rem;
  color: #0d0d0d;
}

.mg-quick-card span:last-child {
  font-size: 0.82rem;
  color: var(--muted);
}

.mg-dash-solver {
  max-width: 720px;
}

.mg-dash-solver .study-solver-card-wrap {
  margin-top: 0;
}

.solver-options-row {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 0.75rem;
  margin: 0 0 0.9rem;
}

.solver-option-field {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  min-width: 0;
}

.solver-option-field .study-select {
  width: 100%;
}

.solver-actions-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
  margin-top: 0.6rem;
}

.solver-actions-row .study-solver-submit {
  margin-top: 0;
}

.solver-upload-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.9rem;
  height: 1.9rem;
  padding: 0;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 999px;
  background: #fff;
  color: #555;
  cursor: pointer;
}

.solver-upload-icon:hover {
  color: #147a5b;
  border-color: #147a5b;
}

.solver-upload-icon svg {
  width: 0.95rem;
  height: 0.95rem;
}

#solver-drop-zone.is-dragover {
  outline: 2px dashed #147a5b;
  outline-offset: 4px;
  border-radius: 12px;
}

#study-results.is-interview-only .study-tabs,
#study-results.is-interview-only #study-session-source,
#study-results.is-interview-only #study-results-meta,
#study-results.is-interview-only .study-results-actions {
  display: none !important;
}

.interview-simple .interview-messages {
  margin-bottom: 0.75rem;
}

.interview-simple .study-interview-form {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.interview-simple .study-interview-form input {
  flex: 1;
  min-width: 0;
}

.interview-audio-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 999px;
  background: #fff;
  color: #666;
  cursor: pointer;
}

.interview-audio-btn svg {
  width: 1rem;
  height: 1rem;
}

.interview-audio-btn.is-active {
  color: #147a5b;
  border-color: #147a5b;
  background: rgba(20, 122, 91, 0.08);
}

#interview-mic.is-active {
  color: #dc2626;
  border-color: #dc2626;
  background: rgba(220, 38, 38, 0.08);
}

.interview-compact-bar {
  display: flex;
  justify-content: flex-end;
  align-items: center;
  gap: 0.35rem;
  margin: -0.25rem 0 0.75rem;
}

.interview-compact-role,
.interview-compact-level {
  height: 1.75rem;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 999px;
  background-color: #fff;
  color: #333;
  font-size: 0.75rem;
  font-weight: 600;
}

.interview-compact-role {
  width: 9.5rem;
  max-width: 100%;
  min-width: 0;
  padding: 0 0.65rem;
}

.interview-compact-level {
  appearance: none;
  -webkit-appearance: none;
  padding: 0 1.4rem 0 0.6rem;
  background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='3'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 0.45rem center;
  cursor: pointer;
}

.interview-compact-role:focus-visible,
.interview-compact-level:focus-visible {
  outline: 2px solid #147a5b;
  outline-offset: 1px;
}

.solver-method-compact {
  flex-shrink: 0;
  margin-left: auto;
}

.solver-method-compact select {
  appearance: none;
  -webkit-appearance: none;
  height: 1.75rem;
  padding: 0 1.5rem 0 0.6rem;
  border: 1px solid rgba(0, 0, 0, 0.12);
  border-radius: 999px;
  background: #fff url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='10' viewBox='0 0 24 24' fill='none' stroke='%23666' stroke-width='3'%3E%3Cpath d='m6 9 6 6 6-6'/%3E%3C/svg%3E") no-repeat right 0.5rem center;
  color: #333;
  font-size: 0.75rem;
  font-weight: 600;
  cursor: pointer;
}

.solver-method-compact select:focus-visible {
  outline: 2px solid #147a5b;
  outline-offset: 1px;
}

.study-solver-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: wrap;
}

.study-solver-method {
  display: inline-flex;
  align-items: center;
  padding: 0.25rem 0.55rem;
  border-radius: 8px;
  background: rgba(37, 99, 235, 0.1);
  color: #1d4ed8;
  font-size: 0.75rem;
  font-weight: 600;
  white-space: nowrap;
}

@media (max-width: 640px) {
  .solver-options-row {
    grid-template-columns: 1fr;
  }
}

.mg-dash-panel[hidden] {
  display: none !important;
}

.dash-session-modal-dialog {
  width: min(640px, 100%);
}

.dash-session-modal-body {
  display: grid;
  gap: 1rem;
}

.dash-session-modal-body .study-create-btn {
  width: 100%;
  margin-top: 0.25rem;
}

.dash-session-modal .study-modal-icon {
  font-size: 1.35rem;
  line-height: 1;
  display: grid;
  place-items: center;
}

.mg-dash-section {
  margin-bottom: 2.25rem;
}

#dashboard-sessions {
  padding-top: 2rem;
}

.mg-dash-section-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1rem;
}

.mg-dash-section-title-block {
  flex: 1;
  min-width: 0;
}

.mg-dash-section-title-row {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.25rem;
}

.mg-dash-section-title-row h2 {
  margin: 0;
  font-size: 1.25rem;
  color: #0d0d0d;
  white-space: nowrap;
}

.mg-dash-search-inline {
  flex: 1;
  min-width: 12rem;
  max-width: 320px;
}

.mg-dash-section-head h2 {
  margin: 0 0 0.25rem;
  font-size: 1.25rem;
  color: #0d0d0d;
}

.mg-dash-section-head p {
  margin: 0;
  font-size: 0.9rem;
  color: var(--muted);
}

.mg-session-list {
  display: grid;
  gap: 0.5rem;
}

.mg-session-row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto auto;
  align-items: center;
  gap: 1rem;
  padding: 0.9rem 1.1rem;
  border-radius: var(--radius-lg);
  background: #fff;
  border: 1px solid var(--border);
  transition: border-color 0.2s, box-shadow 0.2s, transform 0.2s;
}

.mg-session-row:hover {
  border-color: var(--accent);
  box-shadow: 0 10px 24px -16px rgba(79, 70, 229, 0.5);
  transform: translateY(-1px);
}

.mg-session-copy {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.mg-session-origin-row {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem 0.55rem;
  min-width: 0;
}

.mg-session-origin-link,
.mg-session-origin-text {
  display: block;
  flex: 1 1 auto;
  min-width: 0;
  font-size: 0.82rem;
  color: var(--muted);
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mg-session-origin-link:hover {
  color: var(--accent);
  text-decoration: underline;
}

.study-session-source {
  margin: 0.15rem 0 0.35rem;
}

.study-session-source .mg-session-origin-row {
  flex-wrap: wrap;
}

.study-session-source .mg-session-origin-link,
.study-session-source .mg-session-origin-text {
  white-space: normal;
  overflow: visible;
  text-overflow: unset;
  flex: 1 1 100%;
}

.mg-session-actions {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.mg-session-delete {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  background: #fff;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s, background 0.15s;
}

.mg-session-delete svg {
  width: 1rem;
  height: 1rem;
}

.mg-session-delete:hover {
  color: #dc2626;
  border-color: rgba(220, 38, 38, 0.35);
  background: rgba(220, 38, 38, 0.06);
}

.mg-session-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.mg-session-card {
  display: grid;
  gap: 0.65rem;
  padding: 1.25rem;
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: box-shadow 0.2s, border-color 0.2s;
}

.mg-session-card:hover {
  border-color: rgba(0, 0, 0, 0.22);
  box-shadow: var(--shadow-md);
}

.mg-session-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem;
}

.mg-session-source {
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--accent);
}

.mg-session-title {
  margin: 0;
  font-size: 0.95rem;
  font-weight: 600;
  line-height: 1.35;
  color: #0d0d0d;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mg-session-date {
  font-size: 0.82rem;
  color: var(--muted);
  white-space: nowrap;
}

.mg-session-open {
  justify-self: end;
  flex-shrink: 0;
}

.mg-library-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1rem;
}

.mg-library-panel {
  padding: 1.25rem;
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--border);
}

.mg-library-panel-head {
  margin-bottom: 1rem;
}

.mg-library-panel-head h3 {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  font-size: 1rem;
  color: #0d0d0d;
}

.dashboard-empty-mg {
  text-align: center;
  padding: 2rem 1.5rem;
}

.dashboard-empty-wide {
  grid-column: 1 / -1;
}

.dashboard-empty-icon {
  display: block;
  font-size: 2.5rem;
  margin-bottom: 0.75rem;
}

.dashboard-empty-mg strong {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 1.05rem;
}

.dashboard-empty-mg p {
  margin: 0 0 1rem;
  max-width: 28rem;
  margin-left: auto;
  margin-right: auto;
}

.study-field-optional {
  font-weight: 400;
  color: var(--muted);
  font-size: 0.85rem;
}

.mg-progress-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.mg-progress-card {
  padding: 1.5rem;
  border-radius: var(--radius-xl);
  background: #fff;
  border: 1px solid var(--border);
  text-align: center;
}

.mg-progress-icon {
  display: block;
  font-size: 2rem;
  margin-bottom: 0.75rem;
}

.mg-progress-card h3 {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
}

.mg-progress-card p {
  margin: 0;
  color: var(--muted);
  font-size: 0.9rem;
  line-height: 1.5;
}

@media (max-width: 1100px) {
  .mg-dash-quick {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 900px) {
  .mg-dash-stats {
    grid-template-columns: repeat(2, 1fr);
  }

  .mg-dash-quick {
    grid-template-columns: 1fr;
  }

  .mg-library-grid {
    grid-template-columns: 1fr;
  }

  .mg-progress-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 560px) {
  .mg-dash-stats {
    grid-template-columns: 1fr;
  }

  .mg-dash-hero-actions {
    flex-direction: column;
    align-items: stretch;
  }

  .mg-dash-section-title-row {
    flex-direction: column;
    align-items: stretch;
  }

  .mg-dash-search-inline {
    max-width: none;
    width: 100%;
  }

  .mg-session-row {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "copy actions"
      "date actions";
    row-gap: 0.35rem;
  }

  .mg-session-copy {
    grid-area: copy;
  }

  .mg-session-title {
    grid-area: unset;
    white-space: normal;
  }

  .mg-session-date {
    grid-area: date;
  }

  .mg-session-actions {
    grid-area: actions;
    align-self: center;
  }

  .mg-session-open {
    align-self: center;
  }
}

/* ============================================================
   Student-friendly UX polish (additive — appended)
   ============================================================ */

/* One-click session cards: clear affordance + feedback */
.mg-session-row.is-clickable { cursor: pointer; }
.mg-session-row.is-clickable:active { transform: translateY(0); }
.mg-session-row.is-clickable .mg-session-title { transition: color 0.15s; }
.mg-session-row.is-clickable:hover .mg-session-title { color: var(--accent-strong); }
/* The card is the primary click target now — de-emphasize the redundant Open button until hover */
.mg-session-row.is-clickable .mg-session-open { opacity: 0.75; transition: opacity 0.15s; }
.mg-session-row.is-clickable:hover .mg-session-open { opacity: 1; }

/* Accessible keyboard focus everywhere (helps students navigating without a mouse) */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible,
.mg-session-row.is-clickable:focus-visible,
.mg-quick-card:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius, 0.5rem);
}

/* Friendlier, larger tap targets + smoother hover on the quick-start cards */
.mg-quick-card {
  transition: border-color 0.18s, box-shadow 0.18s, transform 0.18s, background 0.18s;
}
.mg-quick-card:hover {
  transform: translateY(-2px);
  box-shadow: 0 12px 26px -18px rgba(79, 70, 229, 0.55);
}

/* Make empty-state guidance feel more inviting and readable for students */
.dashboard-empty p { line-height: 1.55; }
.dashboard-empty strong { font-size: 1.02rem; }

/* ============================================================
   PRODUCTION DESIGN SYSTEM  (appended — cascades over base)
   Refines tokens, typography, buttons, inputs, cards, states.
   Keeps the existing indigo brand; adds depth, consistency,
   and complete interaction states across the whole app.
   ============================================================ */

:root {
  /* Refined neutral + brand ramp (accessible contrast) */
  --text: #0b1220;
  --muted: #556074;
  --muted-light: #8a94a6;
  --border: #e6e9ef;
  --border-strong: #d3d8e2;
  --accent: #5b5bf0;
  --accent-strong: #4a44d6;
  --accent-soft: rgba(91, 91, 240, 0.10);
  --accent-tint: rgba(91, 91, 240, 0.05);
  --cta: #5b5bf0;
  --cta-hover: #4a44d6;
  --cta-gradient: linear-gradient(135deg, #6d6cf5 0%, #5b5bf0 55%, #4a44d6 100%);

  /* Layered, realistic elevation */
  --shadow-sm: 0 1px 2px rgba(16, 24, 40, 0.05), 0 1px 3px rgba(16, 24, 40, 0.05);
  --shadow-md: 0 2px 4px rgba(16, 24, 40, 0.05), 0 6px 16px -6px rgba(16, 24, 40, 0.10);
  --shadow-lg: 0 8px 24px -8px rgba(16, 24, 40, 0.14), 0 2px 6px rgba(16, 24, 40, 0.06);
  --shadow-focus: 0 0 0 3px var(--accent-soft);

  /* Consistent radius scale */
  --radius-sm: 0.5rem;
  --radius-md: 0.65rem;
  --radius-lg: 0.85rem;
  --radius-xl: 1.1rem;
}

body {
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  font-feature-settings: 'cv02' 1, 'cv03' 1, 'cv04' 1, 'cv11' 1;
  letter-spacing: -0.005em;
}

/* Typography rhythm — tighter, more confident headings */
h1, h2, h3, h4 { letter-spacing: -0.02em; color: var(--text); }
h1 { font-weight: 700; line-height: 1.12; }
h2 { font-weight: 700; line-height: 1.2; }
h3 { font-weight: 650; }

/* ---- Buttons: full state set ---- */
.button {
  padding: 0.7rem 1.35rem;
  border-radius: var(--radius-md);
  font-weight: 600;
  letter-spacing: -0.01em;
  transition: background-color 0.16s ease, box-shadow 0.16s ease, transform 0.12s ease, border-color 0.16s ease, opacity 0.16s ease;
  will-change: transform;
}
.button:active { transform: translateY(0) scale(0.985); }
.button:disabled,
.button[disabled] { opacity: 0.55; cursor: not-allowed; transform: none; box-shadow: none; }

.button-primary {
  background: var(--cta-gradient);
  color: #fff;
  box-shadow: 0 1px 2px rgba(74, 68, 214, 0.30), 0 8px 18px -10px rgba(74, 68, 214, 0.55);
}
.button-primary:hover {
  /* Fix: keep the brand indigo on hover (was drifting to green) */
  background: linear-gradient(135deg, #5b5bf0 0%, #4a44d6 100%);
  box-shadow: 0 2px 4px rgba(74, 68, 214, 0.32), 0 12px 22px -10px rgba(74, 68, 214, 0.6);
  transform: translateY(-1px);
}
.button-primary:active { box-shadow: 0 1px 2px rgba(74, 68, 214, 0.30); }

.button-soft,
.topbar .nav-study-btn,
.topbar .ai-study-btn.button-primary {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
  box-shadow: var(--shadow-sm);
}
.button-soft:hover { border-color: var(--accent); color: var(--accent-strong); }

/* ---- Form controls: unified, focus-ringed ---- */
input:not([type="checkbox"]):not([type="radio"]):not([type="range"]),
select,
textarea,
.study-select,
.study-text-input {
  border-radius: var(--radius-md);
  border: 1px solid var(--border-strong);
  background: var(--surface);
  color: var(--text);
  transition: border-color 0.16s ease, box-shadow 0.16s ease, background 0.16s ease;
}
input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):hover,
select:hover,
textarea:hover { border-color: var(--muted-light); }
input:not([type="checkbox"]):not([type="radio"]):not([type="range"]):focus,
select:focus,
textarea:focus,
.study-select:focus,
.study-text-input:focus {
  outline: none;
  border-color: var(--accent);
  box-shadow: var(--shadow-focus);
}
::placeholder { color: var(--muted-light); opacity: 1; }

/* ---- Cards & surfaces: unified elevation and hover ---- */
.product-card,
.mg-quick-card,
.mg-session-row,
.mg-dash-panel .dashboard-deck-card {
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-sm);
  transition: border-color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}
.mg-quick-card:hover,
.mg-session-row:hover,
.dashboard-deck-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

/* ---- Sidebar refinement ---- */
.app-sidebar { box-shadow: var(--shadow-sm); }
.app-sidebar-link {
  border-radius: var(--radius-sm);
  transition: background 0.15s ease, color 0.15s ease;
}
.app-sidebar-link.is-active {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 600;
}

/* ---- Accessible keyboard focus (consistent, brand-colored) ---- */
a:focus-visible,
button:focus-visible,
input:focus-visible,
select:focus-visible,
textarea:focus-visible,
[tabindex]:focus-visible,
.mg-session-row.is-clickable:focus-visible,
.mg-quick-card:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

/* ---- Respect reduced-motion preferences ---- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

/* ============================================================
   PRODUCTION REDESIGN — Study session view
   (appended — cascades over base study-view rules)
   ============================================================ */

.study-results-card {
  border-radius: var(--radius-xl);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-md);
  padding: clamp(1.1rem, 2.5vw, 1.9rem);
}

/* Header hierarchy */
.study-results-header {
  align-items: flex-start;
  gap: 1.25rem;
  padding-bottom: 1.1rem;
  margin-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}
.study-results-heading {
  font-size: clamp(1.35rem, 2.4vw, 1.7rem);
  font-weight: 700;
  letter-spacing: -0.025em;
  line-height: 1.18;
}
.study-results-header .study-result-meta { color: var(--muted); }

/* Success banner — semantic green (was indigo bg + green text) */
.study-success-banner {
  padding: 0.6rem 0.9rem;
  border-radius: var(--radius-md);
  background: #ecfdf5;
  border: 1px solid #a7f3d0;
}
.study-success-banner p { color: #047857; font-weight: 600; }
.study-success-icon { background: #10b981; }

/* ---- Segmented tab bar (track + white active pill) ---- */
.study-tabs,
.study-tabs.study-tabs-scroll {
  display: flex;
  flex-wrap: nowrap;
  gap: 4px;
  margin-bottom: 1.5rem;
  padding: 4px;
  background: var(--surface-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow-x: auto;
  scrollbar-width: thin;
}
.study-tab {
  flex: 0 0 auto;
  padding: 0.5rem 0.95rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--muted);
  white-space: nowrap;
  transition: background 0.15s ease, color 0.15s ease, box-shadow 0.15s ease;
}
.study-tab:hover:not(.is-active) {
  color: var(--text);
  background: rgba(11, 18, 32, 0.04);
}
.study-tab.is-active {
  background: var(--surface);
  color: var(--accent-strong);
  box-shadow: var(--shadow-sm);
}

/* ---- Reading panels: comfortable measure + rhythm ---- */
.study-tab-panel { animation: study-fade 0.18s ease both; }
.study-tab-panel.study-result .study-rich-text,
#study-tab-notes .study-rich-text,
#study-tab-original .study-rich-text { max-width: 72ch; line-height: 1.7; }
.study-tab-panel h3 {
  font-size: 1.1rem;
  font-weight: 650;
  letter-spacing: -0.015em;
  margin: 0 0 0.85rem;
}
@keyframes study-fade { from { opacity: 0; transform: translateY(4px); } to { opacity: 1; transform: none; } }
@media (prefers-reduced-motion: reduce) { .study-tab-panel { animation: none; } }

/* Action buttons in header stay tidy on small screens */
@media (max-width: 640px) {
  .study-results-header { flex-direction: column; }
  .study-results-actions { width: 100%; }
}

/* ---- Study view: flashcards ---- */
.study-flashcard {
  border: 1px solid var(--border);
  border-radius: var(--radius-xl);
  box-shadow: var(--shadow-md);
  transition: box-shadow 0.18s ease, border-color 0.18s ease, transform 0.18s ease;
}
.study-flashcard:hover {
  border-color: var(--accent);
  box-shadow: var(--shadow-lg);
  transform: translateY(-2px);
}
.study-flashcard-label {
  background: var(--accent-soft);
  color: var(--accent-strong);
  font-weight: 600;
  letter-spacing: 0.01em;
  border-radius: 999px;
}

/* ---- Study view: quiz options with clear correct/incorrect cues ---- */
.study-quiz-option {
  position: relative;
  padding-right: 2.6rem;
  border-radius: var(--radius-md);
  transition: border-color 0.15s ease, background 0.15s ease, box-shadow 0.15s ease;
}
.study-quiz-option:hover:not(:disabled) {
  border-color: var(--accent);
  background: var(--accent-tint);
}
.study-quiz-option.is-correct {
  border-color: #16a34a;
  background: #f0fdf4;
  color: #14532d;
}
.study-quiz-option.is-wrong {
  border-color: #dc2626;
  background: #fef2f2;
  color: #7f1d1d;
}
.study-quiz-option.is-correct::after,
.study-quiz-option.is-wrong::after {
  position: absolute;
  right: 0.85rem;
  top: 50%;
  transform: translateY(-50%);
  width: 1.35rem;
  height: 1.35rem;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  font-size: 0.8rem;
  font-weight: 700;
  color: #fff;
}
.study-quiz-option.is-correct::after { content: '\2713'; background: #16a34a; }
.study-quiz-option.is-wrong::after { content: '\2715'; background: #dc2626; }
.study-quiz-option:disabled { opacity: 1; }
.study-quiz-option:disabled:not(.is-correct):not(.is-wrong) { opacity: 0.6; }

.study-video-lesson {
  width: min(100%, 960px);
  margin: 0 auto;
}
.study-video-heading {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 0.9rem;
}
.study-video-eyebrow {
  margin: 0 0 0.25rem;
  color: var(--accent-strong, #0d8c6d);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.study-video-title {
  margin: 0;
  font-size: 1.2rem;
}
.study-video-length {
  padding: 0.3rem 0.6rem;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.76rem;
  white-space: nowrap;
}
.study-video-frame {
  position: relative;
  overflow: hidden;
  border-radius: 14px;
  background: #153d32;
  box-shadow: 0 12px 32px rgba(18, 48, 37, 0.16);
  aspect-ratio: 16 / 9;
}
.study-video-canvas {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: contain;
}
.study-video-slide-count {
  position: absolute;
  right: 0.8rem;
  bottom: 0.8rem;
  padding: 0.25rem 0.55rem;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: 999px;
  color: #fff;
  background: rgba(0, 0, 0, 0.36);
  font-size: 0.72rem;
}
.study-video-controls {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.9rem;
}
.study-video-audio {
  flex: 1 1 240px;
  min-width: 180px;
  height: 38px;
}
.study-video-status {
  min-height: 1.35em;
  margin: 0.55rem 0 0;
  color: var(--muted);
  font-size: 0.8rem;
}
.study-video-transcript {
  margin-top: 1.15rem;
  padding: 0.85rem 1rem;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: #fff;
}
.study-video-transcript summary {
  color: var(--text);
  font-size: 0.87rem;
  font-weight: 650;
  cursor: pointer;
}
.study-video-transcript ol {
  display: grid;
  gap: 0.8rem;
  margin: 0.9rem 0 0;
  padding-left: 1.25rem;
}
.study-video-transcript li { padding-left: 0.2rem; }
.study-video-transcript li strong { font-size: 0.85rem; }
.study-video-transcript li p {
  margin: 0.25rem 0 0;
  color: var(--muted);
  font-size: 0.82rem;
  line-height: 1.6;
}
@media (max-width: 560px) {
  .study-video-controls > .button { flex: 1 1 auto; }
  .study-video-audio { flex-basis: 100%; order: 3; }
}

/* ============================================================
   Study page (dashboard): same look as the home page
   (src/pages/HomePage.tsx) — forest green, mint tints, pastel
   icon tiles — plus an icon-only sidebar that expands on hover.
   ============================================================ */

body[data-page="dashboard"] {
  --text: #172621;
  --muted: #586b63;
  --muted-light: #78867f;
  --border: #e3ebe5;
  --border-strong: #cbded0;
  --surface-soft: #f3f8f4;
  --accent: #147a5b;
  --accent-strong: #0d6147;
  --accent-soft: #e8f5ec;
  --accent-tint: #f0f8f1;
  --cta: #147a5b;
  --cta-hover: #0d6147;
  --cta-gradient: linear-gradient(135deg, #147a5b 0%, #147a5b 100%);
  --page-gradient: linear-gradient(180deg, #f3faf5 0%, #ffffff 96%);
  --hero-tint: linear-gradient(180deg, #f3faf5 0%, #ffffff 96%);
  --shadow-sm: 0 1px 2px rgba(29, 66, 47, 0.04);
  --shadow-md: 0 14px 34px rgba(29, 66, 47, 0.07);
  --shadow-lg: 0 25px 70px rgba(29, 66, 47, 0.14);
  --shadow-focus: 0 0 0 3px rgba(20, 122, 91, 0.18);
  color: var(--text);
  background: #fff;
}

/* ---- Page background: home hero mint fade ---- */
body[data-page="dashboard"] .app-layout,
body[data-page="dashboard"].app-layout,
body[data-page="dashboard"] .app-main {
  background:
    radial-gradient(ellipse at 83% 0%, rgba(214, 239, 224, 0.75), transparent 40%),
    linear-gradient(180deg, #f3faf5 0%, #ffffff 520px);
}

/* ---- Buttons: solid green like the home CTA ---- */
body[data-page="dashboard"] .button-primary,
body[data-page="dashboard"] .mg-sidebar .mg-sidebar-cta {
  background: #147a5b;
  color: #fff;
  border-radius: 0.7rem;
  box-shadow: 0 7px 16px rgba(20, 122, 91, 0.16);
}
body[data-page="dashboard"] .button-primary:hover,
body[data-page="dashboard"] .mg-sidebar .mg-sidebar-cta:hover {
  background: #0d6147;
  color: #fff;
  box-shadow: 0 10px 20px rgba(20, 122, 91, 0.2);
}
body[data-page="dashboard"] :is(.button-outline, .button-soft, .button-ghost) {
  border-color: var(--border);
  background: #fff;
  color: var(--text);
}
body[data-page="dashboard"] :is(.button-outline, .button-soft, .button-ghost):hover { background: #f5f9f6; }

/* ---- Headings: heavy, tight tracking like the home page ---- */
body[data-page="dashboard"] :is(h1, h2, h3, h4) { color: var(--text); }
body[data-page="dashboard"] :is(.mg-dash-section-head h2, .mg-dash-section-title-row h2, .study-results-heading) {
  font-weight: 800;
  letter-spacing: -0.04em;
}

/* ---- Welcome hero: white preview card on mint, green kicker ---- */
.mg-dash-hero {
  background: rgba(255, 255, 255, 0.96);
  color: var(--text);
  border: 1px solid #e7eee8;
  border-radius: 1.2rem;
  box-shadow: 0 25px 70px -30px rgba(29, 66, 47, 0.25);
}
.mg-dash-hero::after {
  top: -55%;
  right: -10%;
  border-radius: 46% 54% 42% 58% / 54% 40% 60% 46%;
  background: #dff2e4;
  opacity: 0.7;
}
.mg-dash-greeting {
  display: inline-flex;
  padding: 0;
  background: none;
  border: 0;
  color: #147a5b;
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.09em;
  text-transform: uppercase;
}
.mg-dash-hero h1 {
  color: var(--text);
  font-weight: 800;
  letter-spacing: -0.055em;
}
.mg-dash-hero-copy p:last-child { color: var(--muted); }
.mg-dash-hero .mg-dash-cta.button-primary { background: #147a5b; color: #fff; }
.mg-dash-hero .mg-dash-cta.button-primary:hover { background: #0d6147; color: #fff; }

/* ---- Cards: home feature-card look ---- */
body[data-page="dashboard"] :is(.mg-stat-card, .mg-quick-card, .mg-session-row, .mg-session-card, .product-card, .study-results-card) {
  background: #fff;
  border: 1px solid #e9efea;
  border-radius: 1rem;
  box-shadow: none;
}
body[data-page="dashboard"] :is(.mg-stat-card, .mg-quick-card, .mg-session-row, .mg-session-card):hover {
  transform: translateY(-3px);
  border-color: #cbded0;
  box-shadow: 0 14px 34px rgba(29, 66, 47, 0.07);
}
body[data-page="dashboard"] .mg-quick-card::before { display: none; }
body[data-page="dashboard"] .mg-quick-icon {
  background: #e8f5ec;
  box-shadow: none;
  border-radius: 0.78rem;
}
body[data-page="dashboard"] :is(.mg-stat-card strong, .mg-quick-card strong) { color: var(--text); }

/* Stat icons: pastel tiles from the home feature cards */
body[data-page="dashboard"] .mg-stat-icon { border-radius: 0.78rem; box-shadow: none; }
body[data-page="dashboard"] .mg-stat-icon-sessions { color: #147a5b; background: #e8f5ec; }
body[data-page="dashboard"] .mg-stat-icon-cards { color: #7654ae; background: #f0ebfa; }
body[data-page="dashboard"] .mg-stat-icon-due { color: #bf6741; background: #fff0e8; }
body[data-page="dashboard"] .mg-stat-icon-folders { color: #3b72a3; background: #eaf2fb; }
body[data-page="dashboard"] .mg-stat-card-accent {
  border-color: #e9efea;
  background: #fff;
}
body[data-page="dashboard"] .mg-stat-card-accent strong { color: #bf6741; }

/* Tabs, chips and pills in green */
body[data-page="dashboard"] .study-tab.is-active,
body[data-page="dashboard"] .ai-tab-btn.is-active {
  color: #147a5b;
  border-color: #147a5b;
}
body[data-page="dashboard"] .study-solver-method,
body[data-page="dashboard"] .ai-context-badge {
  background: #edf7f0;
  border-color: transparent;
  color: #147a5b;
}
body[data-page="dashboard"] :is(input, select, textarea):focus-visible {
  border-color: #147a5b;
  box-shadow: 0 0 0 3px rgba(20, 122, 91, 0.15);
  outline: none;
}

/* ---- Sidebar: white glass like the home nav, green brand mark ---- */
.mg-sidebar .app-sidebar-logo {
  width: 2.1rem;
  height: 2.1rem;
  border-radius: 0.7rem;
  background: #147a5b;
  font-size: 0.95rem;
}
.mg-sidebar .app-sidebar-brand-text { font-weight: 800; letter-spacing: -0.04em; color: var(--text); }
.app-sidebar-text { white-space: nowrap; }

.mg-sidebar .app-sidebar-link {
  gap: 0.75rem;
  padding: 0.3rem;
  border-radius: 0.85rem;
  color: #586b63;
  font-size: 0.86rem;
  font-weight: 600;
}
.mg-sidebar .app-sidebar-link:hover { background: #f3f8f4; color: var(--text); }
.mg-sidebar .app-sidebar-link.is-active { background: #edf7f0; color: #0d6147; }

/* Pastel icon tiles (home feature-icon palette) with a little motion */
.sb-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  width: 2.25rem;
  height: 2.25rem;
  border-radius: 0.78rem;
  color: var(--sb-ink);
  background: var(--sb-bg);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--sb-ink) 12%, transparent);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1), background 0.2s ease, color 0.2s ease, box-shadow 0.2s ease;
}
.mg-sidebar .app-sidebar-link .sb-icon svg {
  width: 1.15rem;
  height: 1.15rem;
  opacity: 1;
  color: inherit;
}
.sb-blue   { --sb-ink: #147a5b; --sb-bg: #e8f5ec; }  /* Overview */
.sb-violet { --sb-ink: #7654ae; --sb-bg: #f0ebfa; }  /* My sessions */
.sb-amber  { --sb-ink: #9c771b; --sb-bg: #fbf4db; }  /* Help on homework */
.sb-pink   { --sb-ink: #ad5071; --sb-bg: #faeaf0; }  /* AI Tutor */
.sb-teal   { --sb-ink: #3b72a3; --sb-bg: #eaf2fb; }  /* Upload study materials */
.sb-red    { --sb-ink: #bf6741; --sb-bg: #fff0e8; }  /* Record lecture */
.sb-green  { --sb-ink: #0f766e; --sb-bg: #e3f4f1; }  /* Mock interview */
.sb-indigo { --sb-ink: #147a5b; --sb-bg: #e8f5ec; }  /* Ai Study + */
.sb-sky    { --sb-ink: #4b6b5f; --sb-bg: #eef3f0; }  /* Home */

.mg-sidebar .app-sidebar-link:hover .sb-icon {
  transform: translateY(-2px) rotate(-6deg) scale(1.08);
  box-shadow: 0 8px 16px -8px color-mix(in srgb, var(--sb-ink) 55%, transparent),
    inset 0 0 0 1px color-mix(in srgb, var(--sb-ink) 18%, transparent);
}
/* Current page: tile fills with its color, glyph turns white */
.mg-sidebar .app-sidebar-link.is-active .sb-icon {
  color: #fff;
  background: var(--sb-ink);
  box-shadow: 0 8px 16px -8px color-mix(in srgb, var(--sb-ink) 70%, transparent);
}

/* ---- Icon-only sidebar, expands on hover (desktop) ---- */
@media (min-width: 721px) {
  .app-layout-mg .mg-sidebar {
    width: 4.75rem;
    padding: 0.85rem 0.6rem;
    overflow-x: hidden;
    background: rgba(255, 255, 255, 0.92);
    backdrop-filter: blur(14px);
    border-right: 1px solid rgba(227, 235, 229, 0.8);
    box-shadow: none;
    transition: width 0.22s ease, box-shadow 0.22s ease;
  }
  .app-layout-mg .mg-sidebar:hover,
  .app-layout-mg .mg-sidebar:focus-within {
    width: 15.5rem;
    box-shadow: 0 25px 70px rgba(29, 66, 47, 0.14);
  }
  .app-layout-mg .app-main,
  body[data-page="dashboard"] .app-main { margin-left: 4.75rem; }

  .app-layout-mg .mg-sidebar .app-sidebar-nav { padding: 0; }
  /* Left padding of 0.65rem centers 2.25rem tiles in the collapsed rail. */
  .app-layout-mg .mg-sidebar .app-sidebar-link { padding: 0.3rem 0.3rem 0.3rem 0.65rem; }
  .app-layout-mg .mg-sidebar .app-sidebar-top { padding: 0.2rem 0.3rem 0.85rem 0.72rem; }

  .app-layout-mg .mg-sidebar :is(.app-sidebar-text, .app-sidebar-brand-text, .app-sidebar-nav-label, .app-sidebar-user-copy, .sidebar-user-actions) {
    opacity: 0;
    transition: opacity 0.15s ease;
  }
  .app-layout-mg .mg-sidebar:hover :is(.app-sidebar-text, .app-sidebar-brand-text, .app-sidebar-nav-label, .app-sidebar-user-copy, .sidebar-user-actions),
  .app-layout-mg .mg-sidebar:focus-within :is(.app-sidebar-text, .app-sidebar-brand-text, .app-sidebar-nav-label, .app-sidebar-user-copy, .sidebar-user-actions) {
    opacity: 1;
    transition-delay: 0.06s;
  }
  .app-layout-mg .mg-sidebar .app-sidebar-nav-label { white-space: nowrap; margin-left: 0.4rem; }

  .app-layout-mg .mg-sidebar .mg-sidebar-cta {
    justify-content: flex-start;
    gap: 0.85rem;
    margin: 0.1rem 0 1rem;
    padding: 0.62rem 0 0.62rem 1.25rem;
    white-space: nowrap;
    overflow: hidden;
  }
  .app-layout-mg .mg-sidebar .app-sidebar-footer { padding-left: 0.2rem; padding-right: 0; }
  .app-layout-mg .mg-sidebar .app-sidebar-user { padding: 0.35rem 0.2rem 0.35rem 0.52rem; }
  .app-layout-mg .mg-sidebar .app-sidebar-avatar { width: 2.1rem; height: 2.1rem; }
  .app-layout-mg .mg-sidebar .app-sidebar-divider { margin: 0.65rem 0.3rem; }
}

@media (prefers-reduced-motion: reduce) {
  .app-layout-mg .mg-sidebar,
  .sb-icon,
  .app-sidebar-text { transition: none !important; }
  .mg-sidebar .app-sidebar-link:hover .sb-icon { transform: none; }
}

/* Let the React root fill the flex body so the main area spans the screen. */
body[data-page="dashboard"] > #root,
body[data-page="dashboard"] > #root > div {
  flex: 1;
  min-width: 0;
  width: 100%;
}
body[data-page="dashboard"] .app-main-inner.mg-dashboard {
  width: min(1160px, calc(100% - 3rem));
  margin-inline: auto;
}

/* Quick-action icons: line glyphs on pastel tiles like the home feature cards */
body[data-page="dashboard"] .mg-quick-icon svg { width: 1.3rem; height: 1.3rem; }
body[data-page="dashboard"] .mg-quick-icon.qi-mint   { color: #147a5b; background: #e8f5ec; }
body[data-page="dashboard"] .mg-quick-icon.qi-lilac  { color: #7654ae; background: #f0ebfa; }
body[data-page="dashboard"] .mg-quick-icon.qi-blue   { color: #3b72a3; background: #eaf2fb; }
body[data-page="dashboard"] .mg-quick-icon.qi-peach  { color: #bf6741; background: #fff0e8; }
body[data-page="dashboard"] .mg-quick-icon.qi-rose   { color: #ad5071; background: #faeaf0; }
body[data-page="dashboard"] .mg-quick-icon.qi-yellow { color: #9c771b; background: #fbf4db; }

/* The "Ai Study +" app link is always current; keep it quiet so only the section link stands out. */
.mg-sidebar .app-sidebar-nav-secondary .app-sidebar-link.is-active { background: transparent; color: #586b63; }
.mg-sidebar .app-sidebar-nav-secondary .app-sidebar-link.is-active .sb-icon {
  color: var(--sb-ink);
  background: var(--sb-bg);
  box-shadow: inset 0 0 0 1px color-mix(in srgb, var(--sb-ink) 12%, transparent);
}

/* Quick actions: 3-column grid like the home feature cards */
body[data-page="dashboard"] .mg-dash-quick { grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 1rem; }
@media (max-width: 900px) { body[data-page="dashboard"] .mg-dash-quick { grid-template-columns: repeat(2, minmax(0, 1fr)); } }
@media (max-width: 560px) { body[data-page="dashboard"] .mg-dash-quick { grid-template-columns: minmax(0, 1fr); } }

/* After a menu click the sidebar folds back to icons until the mouse moves again (see initAppSidebar). */
@media (min-width: 721px) {
  .app-layout-mg .mg-sidebar.is-hold-collapsed,
  .app-layout-mg .mg-sidebar.is-hold-collapsed:hover,
  .app-layout-mg .mg-sidebar.is-hold-collapsed:focus-within {
    width: 4.75rem;
    box-shadow: none;
  }
  .app-layout-mg .mg-sidebar.is-hold-collapsed :is(.app-sidebar-text, .app-sidebar-brand-text, .app-sidebar-nav-label, .app-sidebar-user-copy, .sidebar-user-actions),
  .app-layout-mg .mg-sidebar.is-hold-collapsed:hover :is(.app-sidebar-text, .app-sidebar-brand-text, .app-sidebar-nav-label, .app-sidebar-user-copy, .sidebar-user-actions) {
    opacity: 0;
    transition-delay: 0s;
  }
}

/* My sessions search: one compact field, no icon or outer frame */
body[data-page="dashboard"] .mg-dash-search-wrap {
  padding: 0;
  border: 0;
  background: none;
  box-shadow: none;
  min-width: 0;
  max-width: 260px;
}
body[data-page="dashboard"] .mg-dash-search-wrap input {
  width: 100%;
  height: 2.25rem;
  margin: 0;
  padding: 0 0.9rem;
  border: 1px solid #e3ebe5;
  border-radius: 999px;
  background: #fff;
  font-size: 0.86rem;
  box-shadow: none;
}
body[data-page="dashboard"] .mg-dash-search-wrap input:focus {
  border-color: #147a5b;
  box-shadow: 0 0 0 3px rgba(20, 122, 91, 0.15);
  outline: none;
}