/* BestWayToLearn.AI — Neural Editorial Theme */

:root {
  --bg-deep: #060a10;
  --bg-surface: #0d1219;
  --bg-elevated: #141b26;
  --bg-card: #111820;
  --border: rgba(45, 212, 191, 0.12);
  --border-strong: rgba(45, 212, 191, 0.28);
  --text-primary: #e8edf4;
  --text-secondary: #8b9cb3;
  --text-muted: #5a6d85;
  --accent-teal: #2dd4bf;
  --accent-teal-dim: rgba(45, 212, 191, 0.15);
  --accent-amber: #f59e0b;
  --accent-amber-dim: rgba(245, 158, 11, 0.12);
  --accent-rose: #fb7185;
  --accent-violet: #a78bfa;
  --accent-sky: #38bdf8;
  --accent-sky-dim: rgba(56, 189, 248, 0.14);
  --font-display: 'Noto Serif SC', serif;
  --font-body: 'Outfit', sans-serif;
  --font-mono: 'IBM Plex Mono', monospace;
  --radius-sm: 6px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --shadow-glow: 0 10px 28px rgba(0, 0, 0, 0.28);
  --transition: 0.35s cubic-bezier(0.22, 1, 0.36, 1);
  --header-height: 3.25rem;
  --font-scale: 1;
}

html[data-font-size="sm"] { font-size: 14px; --font-scale: 0.875; }
html[data-font-size="md"] { font-size: 16px; --font-scale: 1; }
html[data-font-size="lg"] { font-size: 18px; --font-scale: 1.125; }
html[data-font-size="xl"] { font-size: 20px; --font-scale: 1.25; }

html[lang="en"] {
  --font-display: 'Outfit', sans-serif;
}

html[lang="en"] .section-header h2,
html[lang="en"] .phase-banner-text h2,
html[lang="en"] .hero-title {
  letter-spacing: -0.02em;
}

.locale-content-notice {
  max-width: 1280px;
  margin: calc(var(--header-height) + 0.75rem) auto 0;
  padding: 0.65rem 1rem;
  font-size: 0.82rem;
  line-height: 1.5;
  color: var(--text-secondary);
  background: rgba(167, 139, 250, 0.08);
  border: 1px solid rgba(167, 139, 250, 0.22);
  border-radius: var(--radius-md);
}

.locale-content-notice.hidden { display: none; }

.theme-icon {
  display: inline-block;
  vertical-align: middle;
  object-fit: contain;
  flex-shrink: 0;
}

.theme-icon-sm { width: 32px; height: 32px; }
.theme-icon-inline { width: 1.15em; height: 1.15em; margin-right: 0.25rem; }
.theme-icon-badge { width: 14px; height: 14px; }
.theme-icon-fundamental { width: 28px; height: 28px; }

.theme-icon-fallback {
  line-height: 1;
}

.overview-tool-head .theme-icon {
  width: 32px;
  height: 32px;
}

.prompt-guide h4 {
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

html {
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-height) + 0.5rem);
  font-size: 16px;
  width: 100%;
  max-width: 100%;
}

body {
  font-family: var(--font-body);
  background:
    radial-gradient(ellipse 90% 50% at 50% -10%, rgba(45, 212, 191, 0.07), transparent 55%),
    radial-gradient(ellipse 60% 40% at 100% 0%, rgba(167, 139, 250, 0.05), transparent 50%),
    var(--bg-deep);
  color: var(--text-primary);
  line-height: 1.65;
  width: 100%;
  max-width: 100%;
  min-width: 0;
  overflow-x: clip;
  -webkit-font-smoothing: subpixel-antialiased;
  -moz-osx-font-smoothing: auto;
  text-rendering: optimizeLegibility;
}

body.welcome-active {
  overflow: hidden;
}

#neural-canvas {
  position: fixed;
  inset: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
  opacity: 0.32;
  pointer-events: none;
}

main {
  position: relative;
  z-index: 1;
}

/* Header */
.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  height: var(--header-height);
  padding: 0 1.25rem;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  transition: var(--transition);
}

.main-nav a[data-nav-tab] {
  line-height: 1.2;
}

.header-inner {
  max-width: 1280px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  flex-wrap: nowrap;
  min-width: 0;
}

.logo {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
  text-decoration: none;
  color: var(--text-primary);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: -0.02em;
}

.logo-mark {
  display: block;
  width: 1.4rem;
  height: 1.4rem;
  object-fit: contain;
  animation: pulse-mark 3s ease-in-out infinite;
}

@keyframes pulse-mark {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.7; transform: scale(0.92); }
}

.logo-text {
  white-space: nowrap;
  line-height: 1.1;
}

.logo-text em {
  font-style: normal;
  color: var(--accent-teal);
  font-weight: 700;
}

.main-nav {
  display: flex;
  gap: 0.15rem;
  flex: 1;
  min-width: 0;
  flex-wrap: nowrap;
  justify-content: center;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scrollbar-width: none;
}

.main-nav::-webkit-scrollbar {
  display: none;
}

.main-nav a {
  color: var(--text-secondary);
  text-decoration: none;
  font-size: 0.8rem;
  font-weight: 500;
  padding: 0.38rem 0.62rem;
  border-radius: var(--radius-sm);
  transition: var(--transition);
  white-space: nowrap;
  flex-shrink: 0;
}

.main-nav a:hover,
.main-nav a[aria-selected="true"],
.main-nav a.active {
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.main-nav a[aria-selected="true"] {
  font-weight: 600;
}

.header-user {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.35rem 0.75rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.8rem;
  cursor: pointer;
  transition: var(--transition);
}

.header-user:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
}

.header-user-avatar {
  display: block;
  width: 1.1rem;
  height: 1.1rem;
  object-fit: contain;
}

.user-profile-overlay {
  position: fixed;
  inset: 0;
  z-index: 10001;
  background: rgba(6, 10, 16, 0.92);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
}

.user-profile-overlay.hidden { display: none; }

.user-profile-modal {
  width: 100%;
  max-width: 420px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 1.75rem;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.45);
}

.user-profile-modal h2 {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin-bottom: 0.5rem;
}

.user-profile-desc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  line-height: 1.5;
}

.user-profile-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.25rem;
}

.user-profile-actions .btn { flex: 1; min-width: 100px; }

.header-lang {
  display: flex;
  align-items: center;
  gap: 0.3rem;
  flex-shrink: 0;
  order: 10;
}

.header-lang-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  background: var(--bg-elevated);
  border: 1.5px solid var(--border);
  border-radius: 50%;
  cursor: pointer;
  transition: var(--transition);
  line-height: 1;
}

.header-lang-btn:hover {
  border-color: var(--accent-violet);
  transform: scale(1.06);
}

.header-lang-btn.active {
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
  box-shadow: 0 0 0 2px rgba(45, 212, 191, 0.2);
}

.header-lang-flag {
  display: block;
  font-size: 1.1rem;
}

.header-prefs {
  position: relative;
  flex-shrink: 0;
  order: 9;
}

.header-prefs-toggle {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  padding: 0;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--text-secondary);
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: -0.02em;
  cursor: pointer;
  transition: var(--transition);
}

.header-prefs-toggle:hover,
.header-prefs-toggle[aria-expanded="true"] {
  border-color: var(--accent-violet);
  color: var(--accent-violet);
  background: rgba(167, 139, 250, 0.1);
}

.header-prefs-icon {
  line-height: 1;
}

.header-prefs-panel {
  position: absolute;
  top: calc(100% + 0.5rem);
  right: 0;
  z-index: 200;
  min-width: 220px;
  padding: 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-glow);
}

.header-prefs-panel.hidden { display: none; }

.header-prefs-title {
  font-size: 0.9rem;
  font-weight: 600;
  margin-bottom: 0.85rem;
}

.header-prefs-field {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  margin-bottom: 0.85rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.header-prefs-field:last-child { margin-bottom: 0; }

.header-prefs-select {
  width: 100%;
  padding: 0.45rem 0.6rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.85rem;
}

.pref-font-btns {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0.35rem;
}

.pref-font-btn {
  padding: 0.4rem 0.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.72rem;
  cursor: pointer;
  transition: var(--transition);
}

.pref-font-btn:hover,
.pref-font-btn.active {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.header-continue {
  display: inline-flex;
  align-items: center;
  padding: 0.38rem 0.75rem;
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--accent-amber);
  text-decoration: none;
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: 100px;
  background: var(--accent-amber-dim);
  white-space: nowrap;
  flex-shrink: 0;
  transition: var(--transition);
}

.header-continue:hover {
  color: var(--bg-deep);
  background: var(--accent-amber);
  border-color: var(--accent-amber);
}

.header-progress {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-teal);
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  background: var(--accent-teal-dim);
  white-space: nowrap;
  flex-shrink: 0;
}

.header-user,
.nav-toggle {
  flex-shrink: 0;
}

/* Page reader */
.page-reader-btn {
  position: fixed;
  left: 1.5rem;
  bottom: 1.5rem;
  z-index: 88;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.55rem 0.9rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.32);
  cursor: pointer;
  transition: var(--transition);
}

.page-reader-btn:hover,
.page-reader-btn:focus-visible {
  color: var(--accent-teal);
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
  outline: none;
}

.page-reader-btn.active {
  color: var(--bg-deep);
  background: linear-gradient(135deg, var(--accent-teal), #14b8a6);
  border-color: var(--accent-teal);
}

.page-reader-icon {
  display: block;
  width: 1rem;
  height: 1rem;
  object-fit: contain;
}

.page-reader-status {
  position: fixed;
  left: 1.5rem;
  bottom: 4.35rem;
  z-index: 88;
  max-width: min(280px, calc(100vw - 3rem));
  padding: 0.45rem 0.75rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  pointer-events: none;
}

.page-reader-status.hidden { display: none; }

body.welcome-active .page-reader-btn,
body.welcome-active .page-reader-status {
  display: none;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

/* Welcome System */
.welcome-overlay {
  position: fixed;
  inset: 0;
  width: 100%;
  min-height: 100dvh;
  z-index: 10000;
  background: rgba(6, 10, 16, 0.97);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  animation: fadeIn 0.4s ease;
}

.welcome-overlay.hidden {
  display: none;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

.welcome-modal {
  width: 100%;
  max-width: 560px;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 2rem;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.5), var(--shadow-glow);
  animation: slideUp 0.5s var(--transition);
}

@keyframes slideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.welcome-teacher {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.75rem;
  padding-bottom: 1.25rem;
  border-bottom: 1px solid var(--border);
}

.teacher-avatar {
  width: 48px;
  height: 48px;
  border-radius: 50%;
  background: linear-gradient(135deg, var(--accent-teal-dim), rgba(167, 139, 250, 0.15));
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
}

.teacher-avatar img,
.teacher-coach-avatar img {
  width: 60%;
  height: 60%;
  object-fit: contain;
}

.teacher-avatar--placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.4rem;
  color: var(--accent-teal);
  animation: pulse-mark 3s ease-in-out infinite;
}

.teacher-label {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 0.15rem;
}

.teacher-name {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-teal);
}

.welcome-step {
  display: none;
  animation: fadeSlideIn 0.35s var(--transition);
}

.welcome-step.active { display: block; }

.welcome-step h2 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin-bottom: 0.85rem;
}

.welcome-step p {
  color: var(--text-secondary);
  font-size: 0.95rem;
  margin-bottom: 0.75rem;
  line-height: 1.65;
}

.welcome-hint {
  font-size: 0.85rem !important;
  color: var(--text-muted) !important;
  padding: 0.75rem 1rem;
  background: var(--accent-teal-dim);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-teal);
}

.welcome-flow {
  display: flex;
  align-items: center;
  gap: 0.35rem;
  flex-wrap: wrap;
  margin-top: 1rem;
}

.welcome-flow-item {
  flex: 1;
  min-width: 90px;
  padding: 0.75rem 0.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  text-align: center;
}

.welcome-flow-item span {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-teal);
  margin-bottom: 0.25rem;
}

.welcome-flow-item strong {
  display: block;
  font-size: 0.78rem;
  margin-bottom: 0.15rem;
}

.welcome-flow-item small {
  font-size: 0.65rem;
  color: var(--text-muted);
}

.welcome-flow-arrow {
  color: var(--text-muted);
  font-size: 0.9rem;
}

.welcome-list {
  margin: 0.5rem 0 0 1.2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.welcome-list li { margin-bottom: 0.4rem; }

.welcome-name-input {
  width: 100%;
  padding: 0.9rem 1.1rem;
  margin-top: 0.5rem;
  background: var(--bg-deep);
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1.1rem;
  outline: none;
  transition: var(--transition);
}

.welcome-name-input:focus {
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 3px var(--accent-teal-dim);
}

.welcome-name-error {
  color: var(--accent-rose);
  font-size: 0.82rem;
  margin-top: 0.5rem;
}

.welcome-ready-card {
  margin-top: 1rem;
  padding: 1.25rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-align: center;
}

.welcome-ready-card p {
  font-family: var(--font-display);
  font-size: 1rem;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.welcome-ready-card span {
  font-size: 0.8rem;
  color: var(--accent-teal);
}

.welcome-footer {
  margin-top: 2rem;
  padding-top: 1.25rem;
  border-top: 1px solid var(--border);
}

.welcome-dots {
  display: flex;
  justify-content: center;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.welcome-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  transition: var(--transition);
}

.welcome-dot.active {
  background: var(--accent-teal);
  border-color: var(--accent-teal);
  transform: scale(1.2);
}

.welcome-actions {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
}

.welcome-actions .btn { min-width: 110px; }

/* Teacher Coach Bar */
.teacher-coach {
  position: fixed;
  bottom: 1.5rem;
  right: 1.5rem;
  z-index: 90;
  width: min(400px, calc(100vw - 2rem));
  animation: slideUp 0.5s var(--transition);
}

.teacher-coach.hidden { display: none; }

.teacher-coach.collapsed {
  width: auto;
}

.teacher-coach.collapsed .teacher-coach-body {
  display: none;
}

.teacher-coach.collapsed .teacher-coach-inner {
  padding: 0.65rem 0.75rem;
  align-items: center;
}

.teacher-coach-inner {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  padding: 1rem 1.1rem;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-glow);
}

.teacher-coach-body {
  flex: 1;
  min-width: 0;
}

.teacher-coach-avatar {
  width: 36px;
  height: 36px;
  border-radius: 50%;
  background: var(--accent-teal-dim);
  border: 1px solid var(--border-strong);
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--accent-teal);
  font-size: 1rem;
  flex-shrink: 0;
}

.teacher-coach-name {
  display: block;
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--accent-teal);
  margin-bottom: 0.25rem;
}

.teacher-coach-msg {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin: 0 0 0.65rem;
}

.teacher-coach-nav {
  margin-bottom: 0.55rem;
}

.teacher-coach-nav.open {
  padding-bottom: 0.55rem;
  border-bottom: 1px solid var(--border);
}

.teacher-coach-nav-toggle {
  display: flex;
  align-items: center;
  justify-content: space-between;
  width: 100%;
  padding: 0.4rem 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--text-muted);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: var(--transition);
}

.teacher-coach-nav-toggle:hover,
.teacher-coach-nav-toggle:focus-visible {
  color: var(--accent-teal);
  border-color: var(--border-strong);
  background: var(--accent-teal-dim);
  outline: none;
}

.teacher-coach-nav-chevron {
  font-size: 0.85rem;
  line-height: 1;
  transition: transform var(--transition);
}

.teacher-coach-nav.open .teacher-coach-nav-chevron {
  transform: rotate(90deg);
}

.teacher-coach-nav-grid {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  max-height: 92px;
  overflow-y: auto;
  scrollbar-width: thin;
  margin-top: 0.45rem;
}

.teacher-coach-nav-grid[hidden] {
  display: none;
}

.teacher-coach-nav-btn {
  padding: 0.32rem 0.62rem;
  font-family: var(--font-body);
  font-size: 0.72rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: 100px;
  cursor: pointer;
  transition: var(--transition);
  white-space: nowrap;
}

.teacher-coach-nav-btn:hover,
.teacher-coach-nav-btn:focus-visible {
  color: var(--accent-teal);
  border-color: var(--border-strong);
  background: var(--accent-teal-dim);
  outline: none;
}

.teacher-coach-nav-btn.active {
  color: var(--accent-teal);
  border-color: rgba(45, 212, 191, 0.45);
  background: var(--accent-teal-dim);
}

.teacher-coach-search {
  position: relative;
}

.teacher-coach-search-input {
  width: 100%;
  padding: 0.55rem 0.85rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  outline: none;
  transition: var(--transition);
}

.teacher-coach-search-input:focus {
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 2px var(--accent-teal-dim);
}

.teacher-coach-search-input::placeholder {
  color: var(--text-muted);
}

.teacher-coach-results {
  position: absolute;
  left: 0;
  right: 0;
  bottom: calc(100% + 0.4rem);
  max-height: 240px;
  overflow-y: auto;
  margin: 0;
  padding: 0.35rem;
  list-style: none;
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-md);
  box-shadow: 0 -8px 32px rgba(0, 0, 0, 0.35);
}

.teacher-coach-results.hidden { display: none; }

.teacher-coach-result {
  display: flex;
  align-items: flex-start;
  gap: 0.5rem;
  width: 100%;
  padding: 0.55rem 0.65rem;
  background: none;
  border: none;
  border-radius: var(--radius-sm);
  text-align: left;
  cursor: pointer;
  transition: var(--transition);
}

.teacher-coach-result:hover,
.teacher-coach-result:focus-visible {
  background: var(--accent-teal-dim);
  outline: none;
}

.teacher-coach-result-type {
  flex-shrink: 0;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  padding: 0.15rem 0.4rem;
  border-radius: 4px;
  background: var(--bg-elevated);
  color: var(--accent-amber);
  margin-top: 0.1rem;
}

.teacher-coach-result-text {
  min-width: 0;
}

.teacher-coach-result-text strong {
  display: block;
  font-size: 0.82rem;
  color: var(--text-primary);
  line-height: 1.3;
}

.teacher-coach-result-text small {
  display: block;
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: 0.1rem;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.teacher-coach-result-empty {
  padding: 0.65rem;
  font-size: 0.78rem;
  color: var(--text-muted);
  text-align: center;
}

.teacher-coach-toggle {
  background: none;
  border: none;
  color: var(--text-muted);
  font-size: 1.2rem;
  cursor: pointer;
  padding: 0.2rem;
  line-height: 1;
  flex-shrink: 0;
}

.teacher-coach-toggle:hover { color: var(--text-primary); }

.footer-reset-welcome {
  background: none;
  border: none;
  color: var(--accent-teal);
  font-size: inherit;
  cursor: pointer;
  text-decoration: underline;
  margin-left: 0.5rem;
  padding: 0;
}

.footer-reset-welcome:hover { color: var(--text-primary); }

.nav-toggle {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0.5rem;
}

.nav-toggle span {
  display: block;
  width: 22px;
  height: 2px;
  background: var(--text-primary);
  transition: var(--transition);
}

/* Main layout */
main {
  position: relative;
  z-index: 1;
  width: 100%;
  max-width: 100%;
}

.section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 4rem 1.75rem;
}

.section-header {
  margin-bottom: 2.25rem;
  max-width: 640px;
}

.roadmap-section {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  max-width: none;
  width: 100%;
  padding: 2.5rem 0 4rem;
}

.roadmap-section > :not(.roadmap-backdrop) {
  position: relative;
  z-index: 1;
  max-width: 1280px;
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.75rem;
  padding-right: 1.75rem;
}

.roadmap-backdrop {
  position: absolute;
  left: 50%;
  top: 0;
  width: 100vw;
  height: 100%;
  min-height: 420px;
  transform: translateX(-50%);
  z-index: 0;
  pointer-events: none;
  overflow: hidden;
}

.roadmap-backdrop-image {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.roadmap-backdrop-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(6, 10, 16, 0.35) 0%, rgba(6, 10, 16, 0.65) 70%, var(--bg-deep) 100%),
    radial-gradient(ellipse 60% 55% at 75% 40%, rgba(45, 212, 191, 0.06) 0%, transparent 72%);
  pointer-events: none;
}

.roadmap-backdrop-fade {
  position: absolute;
  inset: auto 0 0;
  height: 100px;
  background: linear-gradient(to bottom, transparent, var(--bg-deep));
}

.section-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent-teal);
  margin-bottom: 1rem;
  padding: 0.35rem 0.75rem;
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  background: var(--accent-teal-dim);
}

.section-header h2 {
  font-family: var(--font-display);
  font-size: clamp(1.75rem, 4vw, 2.5rem);
  font-weight: 700;
  line-height: 1.25;
  margin-bottom: 1rem;
}

.section-header p {
  color: var(--text-secondary);
  font-size: 1.05rem;
}

.section-header-center {
  text-align: center;
  max-width: 560px;
  margin-left: auto;
  margin-right: auto;
}

/* Phase Tab Views */
.phase-view,
.learning-phase {
  animation: phase-view-in 0.35s ease;
}

@keyframes phase-view-in {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.phase-view[hidden],
.learning-phase[hidden] {
  display: none !important;
}

/* Learning Phases */
.learning-phase {
  border-top: 1px solid var(--border);
  padding-top: calc(var(--header-height) + 0.25rem);
  scroll-margin-top: var(--header-height);
}

.learning-phase .section {
  scroll-margin-top: calc(var(--header-height) + 0.5rem);
}

/* Phase Bridge — 阶段衔接引导 */
.phase-next-bridge {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2.5rem 1.75rem 4rem;
}

.phase-bridge-inner {
  padding: 2rem 2.25rem;
  border-radius: var(--radius-lg);
  border: 1px solid var(--border);
  background: linear-gradient(135deg, var(--bg-elevated) 0%, rgba(45, 212, 191, 0.04) 100%);
}

.phase-next-bridge--done .phase-bridge-inner {
  border-color: rgba(45, 212, 191, 0.35);
  background: linear-gradient(135deg, rgba(45, 212, 191, 0.08) 0%, var(--bg-elevated) 100%);
}

.phase-next-bridge--quiz .phase-bridge-inner {
  border-color: rgba(251, 113, 133, 0.35);
  background: linear-gradient(135deg, rgba(251, 113, 133, 0.06) 0%, var(--bg-elevated) 100%);
}

.phase-bridge-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--accent-teal);
  margin-bottom: 0.75rem;
  padding: 0.3rem 0.7rem;
  border-radius: 100px;
  border: 1px solid rgba(45, 212, 191, 0.3);
  background: var(--accent-teal-dim);
}

.phase-next-bridge--quiz .phase-bridge-badge {
  color: var(--accent-rose);
  border-color: rgba(251, 113, 133, 0.35);
  background: rgba(251, 113, 133, 0.1);
}

.phase-bridge-inner h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.phase-bridge-inner > p {
  color: var(--text-secondary);
  margin-bottom: 1.25rem;
  max-width: 52ch;
}

.phase-bridge-score {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  margin-bottom: 1rem !important;
}

.phase-bridge-score strong {
  color: var(--accent-teal);
  font-size: 1.1rem;
}

.phase-bridge-modules {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.phase-bridge-module {
  font-size: 0.85rem;
  padding: 0.4rem 0.85rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--bg-deep);
  color: var(--text-secondary);
  text-decoration: none;
  transition: var(--transition);
}

.phase-bridge-module:hover {
  color: var(--accent-teal);
  border-color: rgba(45, 212, 191, 0.4);
  background: var(--accent-teal-dim);
}

.phase-bridge-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  align-items: center;
}

.phase-bridge-status > p:last-of-type {
  margin-bottom: 1rem;
}

.phase-bridge-mastery h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
  margin-bottom: 0.5rem;
}

.phase-bridge-mastery > p {
  color: var(--text-secondary);
  margin-bottom: 1rem;
  max-width: 56ch;
  line-height: 1.6;
}

.phase-bridge-mastery-progress {
  font-size: 0.88rem !important;
  color: var(--text-muted) !important;
}

.phase-bridge-mastery-progress strong {
  color: var(--accent-teal);
  font-family: var(--font-mono);
}

.phase-bridge-day-chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin-bottom: 1rem;
}

.phase-bridge-day-chip {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  padding: 0.3rem 0.65rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--bg-deep);
  color: var(--text-muted);
}

.phase-bridge-day-chip.is-done {
  color: var(--accent-teal);
  border-color: rgba(45, 212, 191, 0.4);
  background: var(--accent-teal-dim);
}

.phase-bridge-master-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.phase-bridge-master-check {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.25rem;
  height: 1.25rem;
  border-radius: 50%;
  background: rgba(6, 10, 16, 0.25);
  font-size: 0.75rem;
  font-weight: 700;
}

.phase-bridge-mastery--done {
  border-top: none;
}

.phase-bridge-divider {
  height: 1px;
  margin: 1.5rem 0;
  background: linear-gradient(90deg, transparent, var(--border-strong), transparent);
}

.phase-bridge-next {
  padding-top: 0.15rem;
}

.phase-bridge-next-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-amber);
  margin-bottom: 0.65rem;
}

.phase-bridge-next--highlight .phase-bridge-next-eyebrow {
  color: var(--accent-teal);
}

.phase-bridge-flow {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 0.65rem;
  margin-bottom: 0.85rem;
}

.phase-bridge-flow-pill {
  font-size: 0.82rem;
  padding: 0.35rem 0.75rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--bg-deep);
  color: var(--text-muted);
}

.phase-bridge-flow-pill--next {
  color: var(--accent-teal);
  border-color: rgba(45, 212, 191, 0.4);
  background: var(--accent-teal-dim);
  font-weight: 600;
}

.phase-bridge-flow-arrow {
  color: var(--accent-amber);
  font-weight: 700;
  font-size: 1rem;
}

.phase-bridge-next-desc {
  color: var(--text-secondary);
  margin-bottom: 1.1rem;
  max-width: 56ch;
}

.phase-bridge-next .phase-bridge-go-btn {
  width: 100%;
  max-width: 360px;
}

.phase-next-bridge--done .phase-bridge-next {
  border-top: none;
  padding-top: 0;
}

.phase-banner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 2rem 1.75rem 0;
  display: flex;
  align-items: center;
  gap: 1.5rem;
}

.phase-banner.has-page-poster {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  min-height: 240px;
  padding: 2.75rem 1.75rem 2rem;
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  border-top: none;
  margin-bottom: 0.5rem;
  background: #0a0a0c;
}

.page-poster-bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-poster-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, rgba(6, 10, 16, 0.72) 0%, rgba(6, 10, 16, 0.28) 42%, transparent 68%),
    linear-gradient(to top, rgba(6, 10, 16, 0.5) 0%, transparent 48%);
  pointer-events: none;
}

.page-poster-overlay-teal {
  background:
    linear-gradient(100deg, rgba(6, 10, 16, 0.72) 0%, rgba(6, 10, 16, 0.22) 42%, transparent 68%),
    radial-gradient(ellipse 55% 80% at 78% 50%, rgba(45, 212, 191, 0.07) 0%, transparent 70%);
}

.page-poster-overlay-amber,
.page-poster-overlay-gold {
  background:
    linear-gradient(100deg, rgba(6, 10, 16, 0.72) 0%, rgba(6, 10, 16, 0.22) 42%, transparent 68%),
    radial-gradient(ellipse 55% 80% at 78% 50%, rgba(245, 158, 11, 0.07) 0%, transparent 70%);
}

.page-poster-overlay-violet {
  background:
    linear-gradient(100deg, rgba(6, 10, 16, 0.72) 0%, rgba(6, 10, 16, 0.22) 42%, transparent 68%),
    radial-gradient(ellipse 55% 80% at 78% 50%, rgba(167, 139, 250, 0.08) 0%, transparent 70%);
}

.page-poster-overlay-rose {
  background:
    linear-gradient(100deg, rgba(6, 10, 16, 0.72) 0%, rgba(6, 10, 16, 0.22) 42%, transparent 68%),
    radial-gradient(ellipse 55% 80% at 78% 50%, rgba(251, 113, 133, 0.07) 0%, transparent 70%);
}

.page-poster-overlay-sky {
  background:
    linear-gradient(100deg, rgba(6, 10, 16, 0.72) 0%, rgba(6, 10, 16, 0.22) 42%, transparent 68%),
    radial-gradient(ellipse 55% 80% at 78% 50%, rgba(56, 189, 248, 0.08) 0%, transparent 70%);
}

.phase-banner.has-page-poster > :not(.page-poster-bg) {
  position: relative;
  z-index: 1;
}

.phase-banner.has-page-poster .phase-num {
  opacity: 0.7;
}

.phase-num {
  font-family: var(--font-display);
  font-size: 2.5rem;
  font-weight: 700;
  opacity: 0.25;
  line-height: 1;
}

.phase-banner-text h2 {
  font-family: var(--font-display);
  font-size: 1.5rem;
  margin-bottom: 0.25rem;
}

.phase-banner-text p {
  font-size: 0.9rem;
  color: var(--text-muted);
}

.phase-progress {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 0.8rem;
  padding: 0.4rem 0.85rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  white-space: nowrap;
}

.phase-banner-teal .phase-progress { color: var(--accent-teal); border-color: rgba(45,212,191,0.3); background: var(--accent-teal-dim); }
.phase-banner-amber .phase-progress { color: var(--accent-amber); border-color: rgba(245,158,11,0.3); background: var(--accent-amber-dim); }
.phase-banner-violet .phase-progress { color: var(--accent-violet); border-color: rgba(167,139,250,0.3); background: rgba(167,139,250,0.12); }
.phase-banner-rose .phase-progress { color: var(--accent-rose); border-color: rgba(251,113,133,0.3); background: rgba(251,113,133,0.1); }
.phase-banner-plan .phase-num {
  font-size: 0.82rem;
  letter-spacing: 0.04em;
  color: var(--accent-amber);
}
.phase-banner-plan .phase-progress {
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.35);
  background: var(--accent-amber-dim);
}

.phase-banner-gold .phase-num {
  font-size: 2rem;
  opacity: 0.55;
  color: var(--accent-amber);
}

.phase-banner-gold .phase-progress {
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.35);
  background: var(--accent-amber-dim);
}

.phase-banner-sky .phase-num {
  font-size: 1.35rem;
  letter-spacing: 0.06em;
  color: var(--accent-sky);
  opacity: 0.85;
}

.phase-banner-sky .phase-progress {
  color: var(--accent-sky);
  border-color: rgba(56, 189, 248, 0.35);
  background: var(--accent-sky-dim);
}

.learning-phase .section { padding-top: 2rem; }

/* Roadmap */
.roadmap-overall {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.roadmap-overall-bar {
  flex: 1;
  height: 6px;
  background: var(--bg-elevated);
  border-radius: 3px;
  overflow: hidden;
}

.roadmap-overall-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-teal), var(--accent-amber), var(--accent-violet), var(--accent-rose));
  border-radius: 3px;
  transition: width 0.6s var(--transition);
}

.roadmap-overall-text {
  font-family: var(--font-mono);
  font-size: 0.85rem;
  color: var(--accent-teal);
  white-space: nowrap;
}

.roadmap-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
}

.roadmap-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  transition: var(--transition);
  position: relative;
}

.roadmap-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.roadmap-card.done {
  border-color: rgba(45, 212, 191, 0.35);
}

.roadmap-card-num {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-teal);
  margin-bottom: 0.5rem;
}

.roadmap-card h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.roadmap-card-sub {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.75rem;
}

.roadmap-card-desc {
  font-size: 0.85rem;
  color: var(--text-secondary);
  flex: 1;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.roadmap-modules {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 1rem;
}

.roadmap-module-tag {
  font-size: 0.68rem;
  padding: 0.2rem 0.5rem;
  background: var(--bg-elevated);
  border-radius: 100px;
  color: var(--text-muted);
}

.roadmap-card-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.roadmap-card-days {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-amber);
}

.roadmap-card-progress {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}

.roadmap-card-link {
  display: block;
  margin-top: 1rem;
  text-align: center;
  padding: 0.6rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-teal);
  text-decoration: none;
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  transition: var(--transition);
}

.roadmap-card-link:hover {
  background: var(--accent-teal-dim);
}

/* Hero flow preview */
.flow-preview {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
  justify-content: center;
}

.flow-step {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  padding: 0.75rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text-secondary);
  font-size: 0.85rem;
  font-weight: 500;
  transition: var(--transition);
}

.flow-step span {
  font-family: var(--font-mono);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--accent-teal);
}

.flow-step:hover {
  border-color: var(--accent-teal);
  color: var(--text-primary);
}

.flow-arrow {
  color: var(--text-muted);
  font-size: 1.1rem;
}

/* Knowledge view toggle */
.view-toggle {
  display: flex;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.view-toggle-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.6rem 1.2rem;
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.view-toggle-btn.active {
  color: var(--accent-teal);
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.knowledge-view.hidden { display: none; }

/* Path day links */
.path-goto {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-top: 0.85rem;
}

.path-goto-link {
  font-size: 0.78rem;
  padding: 0.35rem 0.75rem;
  background: var(--accent-teal-dim);
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  color: var(--accent-teal);
  text-decoration: none;
  transition: var(--transition);
}

.path-goto-link:hover {
  background: var(--accent-teal);
  color: var(--bg-deep);
}

.path-day-phase-row {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.45rem 0.65rem;
  margin-bottom: 0.45rem;
}

.path-day-phase-label {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.path-phase-enter {
  display: inline-flex;
  align-items: center;
  padding: 0.35rem 0.7rem;
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
  text-decoration: none;
  border: 1px dashed var(--border-strong);
  border-radius: 100px;
  transition: var(--transition);
}

.path-phase-enter:hover {
  color: var(--accent-teal);
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.path-phase-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
  margin-bottom: 0.4rem;
}

.path-phase-1 { color: var(--accent-teal); background: var(--accent-teal-dim); }
.path-phase-2 { color: var(--accent-amber); background: var(--accent-amber-dim); }
.path-phase-3 { color: var(--accent-violet); background: rgba(167,139,250,0.12); }
.path-phase-4 { color: var(--accent-rose); background: rgba(251,113,133,0.1); }

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 0.85rem 1.6rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-md);
  border: none;
  cursor: pointer;
  text-decoration: none;
  transition: var(--transition);
}

.btn-primary {
  background: linear-gradient(135deg, var(--accent-teal), #14b8a6);
  color: var(--bg-deep);
  box-shadow: 0 4px 24px rgba(45, 212, 191, 0.25);
}

.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(45, 212, 191, 0.35);
}

.btn-ghost {
  background: transparent;
  color: var(--text-primary);
  border: 1px solid var(--border-strong);
}

.btn-ghost:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.btn-sm {
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
}

/* Graduation */
.graduation-banner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  max-width: 1280px;
  margin: 0 auto 1.5rem;
  padding: 1.1rem 1.35rem;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.12), rgba(45, 212, 191, 0.1));
  border: 1px solid rgba(245, 158, 11, 0.35);
  border-radius: var(--radius-lg);
}

.graduation-banner-badge,
.graduation-hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--accent-amber);
  margin-bottom: 0.35rem;
}

.graduation-banner p {
  color: var(--text-secondary);
  font-size: 0.92rem;
}

.graduation-section {
  padding-bottom: 4rem;
}

.graduation-hero {
  text-align: center;
  padding: 2.5rem 1.5rem;
  margin-bottom: 2rem;
  background: linear-gradient(160deg, rgba(45, 212, 191, 0.1), rgba(245, 158, 11, 0.08), var(--bg-card));
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
}

.graduation-hero h2 {
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 3.5vw, 2rem);
  margin-bottom: 0.65rem;
}

.graduation-hero-desc {
  color: var(--text-secondary);
  max-width: 36em;
  margin: 0 auto 0.5rem;
  line-height: 1.6;
}

.graduation-hero-date {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.graduation-stats {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 1rem;
  margin-bottom: 2rem;
}

.graduation-stat {
  padding: 1.25rem 1rem;
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.graduation-stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent-teal);
  line-height: 1.1;
}

.graduation-stat-label {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.graduation-modules h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 1rem;
}

.graduation-module-list {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 1rem;
  margin-bottom: 2.5rem;
}

.graduation-module-group {
  padding: 1rem 1.15rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.graduation-module-phase {
  display: block;
  font-weight: 600;
  color: var(--accent-teal);
  margin-bottom: 0.5rem;
  font-size: 0.88rem;
}

.graduation-module-group ul {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.section-header-compact {
  margin-bottom: 1.25rem;
}

.section-header-compact h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin: 0.35rem 0 0.5rem;
}

.practice-plan-30 {
  padding: 1.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
}

.practice-plan-focus {
  border: none;
  margin: 0 0 1.25rem;
  padding: 0;
}

.practice-plan-focus legend {
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.65rem;
}

.practice-plan-focus label {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-right: 1rem;
  margin-bottom: 0.5rem;
  font-size: 0.86rem;
  color: var(--text-secondary);
  cursor: pointer;
}

.practice-plan-weeks {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.practice-plan-week {
  padding: 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.practice-plan-week h4 {
  font-size: 0.9rem;
  color: var(--accent-amber);
  margin-bottom: 0.75rem;
}

.practice-plan-field {
  display: block;
  margin-bottom: 0.65rem;
}

.practice-plan-field span {
  display: block;
  font-size: 0.75rem;
  color: var(--text-muted);
  margin-bottom: 0.25rem;
}

.practice-plan-field input {
  width: 100%;
  padding: 0.5rem 0.65rem;
  font-family: var(--font-body);
  font-size: 0.86rem;
  color: var(--text-primary);
  background: var(--bg-deep);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.practice-plan-field input:focus {
  outline: none;
  border-color: var(--accent-teal);
}

.practice-plan-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.practice-plan-saved {
  margin-top: 0.75rem;
  font-size: 0.8rem;
  color: var(--accent-teal);
}

/* Hero */
.hero {
  position: relative;
  width: 100%;
  max-width: none;
  margin: 0;
  padding: 5.25rem 0 2rem;
  isolation: isolate;
  overflow: hidden;
}

.hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1.05fr 0.95fr;
  align-items: center;
  gap: 2rem;
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 1.75rem;
}

.hero-backdrop {
  position: absolute;
  left: 50%;
  top: 0;
  width: 100vw;
  height: 100%;
  min-height: 420px;
  transform: translateX(-50%);
  z-index: -1;
  pointer-events: none;
  overflow: hidden;
}

.hero-backdrop-image {
  position: absolute;
  inset: 0;
  overflow: hidden;
}

.hero-backdrop-image img,
.roadmap-backdrop-image img,
.page-poster-bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: 72% center;
  display: block;
}

.hero-backdrop-image::after {
  content: '';
  position: absolute;
  inset: 0;
  background:
    linear-gradient(100deg, rgba(6, 10, 16, 0.78) 0%, rgba(6, 10, 16, 0.32) 46%, transparent 72%),
    radial-gradient(ellipse 50% 70% at 80% 45%, rgba(45, 212, 191, 0.06) 0%, transparent 72%);
  pointer-events: none;
}

.hero-backdrop-fade {
  position: absolute;
  inset: auto 0 0;
  height: 120px;
  background: linear-gradient(to bottom, transparent, var(--bg-deep));
}

.hero-content,
.hero-visual {
  position: relative;
}

.hero-eyebrow {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-amber);
  letter-spacing: 0.08em;
  margin-bottom: 0.75rem;
}

.hero-title {
  font-family: var(--font-display);
  font-size: clamp(2rem, 4.8vw, 3.1rem);
  font-weight: 700;
  line-height: 1.12;
  margin-bottom: 1rem;
}

.hero-accent {
  display: inline-block;
  color: #7af0e4;
  text-shadow:
    0 0 24px rgba(122, 240, 228, 0.42),
    0 0 48px rgba(45, 212, 191, 0.16);
}

.hero-accent-ai {
  font-style: normal;
  color: #fcd34d;
  text-shadow:
    0 0 20px rgba(252, 211, 77, 0.38),
    0 0 40px rgba(245, 158, 11, 0.14);
}

.hero-desc {
  color: var(--text-secondary);
  font-size: 1rem;
  max-width: 480px;
  margin-bottom: 1.25rem;
  line-height: 1.6;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-bottom: 0;
}

.hero-stats {
  display: none;
}

.stat-num {
  display: block;
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-teal);
}

.stat-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

/* Orbit visual */
.hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}

.orbit-card {
  position: relative;
  width: 340px;
  height: 340px;
}

.orbit-ring {
  position: absolute;
  inset: 20px;
  border: 1px dashed var(--border-strong);
  border-radius: 50%;
  animation: spin-slow 30s linear infinite;
}

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

.orbit-core {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 140px;
  height: 140px;
  border-radius: 50%;
  background: radial-gradient(circle at 30% 30%, var(--bg-elevated), var(--bg-deep));
  border: 1px solid var(--border-strong);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  box-shadow: var(--shadow-glow);
}

.orbit-label {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
}

.orbit-sub {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-teal);
  margin-top: 0.25rem;
}

.orbit-node {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 80px;
  margin: -14px 0 0 -40px;
  padding: 0.4rem 0.6rem;
  font-size: 0.7rem;
  font-weight: 500;
  text-align: center;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  transform: rotate(var(--angle)) translateY(-150px) rotate(calc(-1 * var(--angle)));
  animation: node-glow 4s ease-in-out infinite;
  animation-delay: calc(var(--angle) / 360deg * 2s);
}

@keyframes node-glow {
  0%, 100% { border-color: var(--border); }
  50% { border-color: var(--accent-teal); box-shadow: 0 0 12px rgba(45, 212, 191, 0.2); }
}

/* Reveal animation */
.reveal {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.45s ease-out, transform 0.45s ease-out;
}

.reveal.visible {
  opacity: 1;
  transform: translateY(0);
}

/* Learning Path */
.path-guide {
  margin-bottom: 1.75rem;
  padding: 1.25rem 1.5rem;
  background: linear-gradient(135deg, rgba(245, 158, 11, 0.08), var(--bg-card));
  border: 1px solid rgba(245, 158, 11, 0.22);
  border-radius: var(--radius-lg);
}

.path-guide h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin-bottom: 0.75rem;
  color: var(--accent-amber);
}

.path-guide ol {
  margin: 0 0 1rem 1.2rem;
  color: var(--text-secondary);
  font-size: 0.9rem;
  line-height: 1.65;
}

.path-guide li { margin-bottom: 0.35rem; }

.path-check-legend {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem 1.5rem;
  padding-top: 0.85rem;
  border-top: 1px solid var(--border);
  font-size: 0.8rem;
  color: var(--text-muted);
}

.path-check-legend-item {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
}

.path-check-sample {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  border: 2px solid var(--border-strong);
  border-radius: var(--radius-sm);
  font-size: 0.75rem;
  color: transparent;
}

.path-check-sample.is-done {
  background: var(--accent-teal);
  border-color: var(--accent-teal);
  color: var(--bg-deep);
}

.path-progress-bar {
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 2px;
  margin-bottom: 0.75rem;
  overflow: hidden;
}

.path-progress-fill {
  height: 100%;
  width: 0%;
  background: linear-gradient(90deg, var(--accent-teal), var(--accent-amber));
  border-radius: 2px;
  transition: width 0.6s var(--transition);
}

.path-progress-text {
  font-size: 0.875rem;
  color: var(--text-muted);
  margin-bottom: 2.5rem;
}

.path-timeline {
  display: grid;
  gap: 1rem;
}

.path-day {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: start;
  gap: 1.5rem;
  padding: 1.5rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.path-day:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow);
}

.path-day.completed {
  border-color: rgba(45, 212, 191, 0.35);
  background: linear-gradient(135deg, var(--bg-card), rgba(45, 212, 191, 0.04));
}

.path-day-num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-amber);
  padding: 0.4rem 0.7rem;
  background: var(--accent-amber-dim);
  border-radius: var(--radius-sm);
  white-space: nowrap;
}

.path-day h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.4rem;
}

.path-goal {
  color: var(--accent-teal);
  font-size: 0.88rem;
  margin-bottom: 0.5rem;
}

.path-day p {
  color: var(--text-secondary);
  font-size: 0.9rem;
}

.path-milestone {
  display: flex;
  align-items: flex-start;
  gap: 0.45rem;
  margin-top: 0.85rem;
  padding: 0.75rem 1rem;
  background: var(--accent-amber-dim);
  border-radius: var(--radius-sm);
  font-size: 0.82rem;
  color: var(--accent-amber);
}

.path-day ul {
  margin-top: 0.75rem;
  padding-left: 1.2rem;
  color: var(--text-muted);
  font-size: 0.85rem;
}

.path-day ul li { margin-bottom: 0.25rem; }

.path-check {
  min-width: 4.25rem;
  padding: 0.45rem 0.55rem;
  border-radius: var(--radius-sm);
  border: 2px solid var(--border-strong);
  background: var(--bg-elevated);
  cursor: pointer;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.15rem;
  font-family: var(--font-body);
  transition: var(--transition);
  flex-shrink: 0;
}

.path-check-box {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  border: 2px solid var(--border-strong);
  font-size: 0.8rem;
  font-weight: 700;
  color: transparent;
  transition: var(--transition);
}

.path-check-label {
  font-size: 0.68rem;
  font-weight: 600;
  color: var(--text-muted);
  line-height: 1.2;
  white-space: nowrap;
}

.path-check:hover {
  border-color: var(--accent-teal);
}

.path-check:hover .path-check-box {
  border-color: var(--accent-teal);
}

.path-check.is-done,
.path-day.completed .path-check {
  border-color: rgba(45, 212, 191, 0.45);
  background: var(--accent-teal-dim);
}

.path-check.is-done .path-check-box,
.path-day.completed .path-check .path-check-box {
  background: var(--accent-teal);
  border-color: var(--accent-teal);
  color: var(--bg-deep);
}

.path-check.is-done .path-check-label,
.path-day.completed .path-check .path-check-label {
  color: var(--accent-teal);
}

/* AI Overview */
.overview-nav {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
  position: sticky;
  top: 72px;
  z-index: 5;
  padding: 0.75rem 0;
  background: linear-gradient(180deg, var(--bg-deep) 70%, transparent);
}

.overview-nav-link {
  padding: 0.45rem 0.9rem;
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--text-secondary);
  text-decoration: none;
  border: 1px solid var(--border);
  border-radius: 100px;
  background: var(--bg-card);
  transition: var(--transition);
}

.overview-nav-link:hover {
  color: var(--accent-teal);
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.overview-blocks {
  display: grid;
  gap: 2rem;
}

.overview-block {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

.overview-block-header {
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 1.5rem 1.75rem;
  background: var(--block-accent, var(--accent-teal-dim));
  border-bottom: 1px solid var(--border);
}

.overview-block-icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  object-fit: contain;
}

.overview-block-tag {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  letter-spacing: 0.06em;
  margin-bottom: 0.2rem;
}

.overview-block-header h3 {
  font-family: var(--font-display);
  font-size: 1.35rem;
}

.overview-block-body {
  padding: 1.5rem 1.75rem 1.75rem;
}

.overview-lead {
  font-size: 1rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.25rem;
}

.overview-intro {
  font-size: 0.95rem;
  color: var(--text-secondary);
  line-height: 1.7;
  margin-bottom: 1.25rem;
  padding-left: 0.85rem;
  border-left: 2px solid var(--border-strong);
}

.overview-subsections {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.overview-subsection {
  padding: 1rem 1.1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.overview-subsection h4 {
  font-size: 0.92rem;
  color: var(--accent-teal);
  margin-bottom: 0.45rem;
}

.overview-subsection p {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.6;
  margin-bottom: 0.5rem;
}

.overview-subsection-list {
  margin: 0.35rem 0 0 1.1rem;
  font-size: 0.84rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.overview-subsection-list li { margin-bottom: 0.3rem; }

.overview-points {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1rem;
}

.overview-point {
  padding: 0.85rem 1rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-teal);
}

.overview-point strong {
  display: block;
  font-size: 0.82rem;
  color: var(--accent-teal);
  margin-bottom: 0.25rem;
}

.overview-point span {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.overview-cap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.overview-field-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.overview-cap-card {
  padding: 0;
  overflow: hidden;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.overview-field-card {
  padding: 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  transition: var(--transition);
}

.overview-cap-card:hover,
.overview-field-card:hover {
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow);
}

.overview-cap-visual {
  aspect-ratio: 16 / 10;
  overflow: hidden;
  background: var(--bg-deep);
  border-bottom: 1px solid var(--border);
}

.overview-cap-visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  transition: transform 0.45s cubic-bezier(0.22, 1, 0.36, 1);
}

.overview-cap-card:hover .overview-cap-visual img {
  transform: scale(1.04);
}

.overview-cap-body {
  padding: 0.85rem 1rem 1rem;
}

.overview-cap-desc {
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 0.45rem;
}

.overview-cap-detail {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin-bottom: 0.5rem;
}

.overview-cap-examples {
  margin: 0 0 0.55rem 1rem;
  font-size: 0.76rem;
  color: var(--text-muted);
  line-height: 1.5;
}

.overview-cap-examples li { margin-bottom: 0.25rem; }

.overview-cap-tip {
  font-size: 0.74rem;
  color: var(--accent-amber);
  line-height: 1.45;
  padding-top: 0.45rem;
  border-top: 1px dashed var(--border);
}

.overview-cap-tip strong { color: var(--accent-amber); }

.overview-collab-tips,
.overview-boundaries {
  margin-top: 1.25rem;
  padding: 1rem 1.1rem;
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.overview-collab-tips {
  background: var(--accent-teal-dim);
}

.overview-boundaries {
  background: rgba(251, 113, 133, 0.08);
  border-color: rgba(251, 113, 133, 0.25);
}

.overview-collab-tips h4,
.overview-boundaries h4 {
  font-size: 0.9rem;
  margin-bottom: 0.65rem;
}

.overview-collab-tips h4 { color: var(--accent-teal); }
.overview-boundaries h4 { color: var(--accent-rose); }

.overview-boundaries ul {
  margin: 0 0 0 1.1rem;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.overview-boundaries li { margin-bottom: 0.35rem; }

.overview-collab-tips .overview-points { margin-bottom: 0; }

.overview-cap-icon,
.overview-field-icon {
  display: block;
  width: 40px;
  height: 40px;
  object-fit: contain;
  margin-bottom: 0.4rem;
}

.overview-cap-card .overview-cap-icon {
  padding: 1rem 1rem 0;
}

.overview-cap-body strong,
.overview-field-card strong {
  display: block;
  font-size: 0.9rem;
  margin-bottom: 0.3rem;
}

.overview-cap-body p,
.overview-field-card p {
  font-size: 0.8rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.overview-tool-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.overview-tool-card {
  padding: 1rem 1.1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.overview-tool-head {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.overview-tool-head strong {
  color: var(--accent-violet);
  font-size: 0.92rem;
}

.overview-tool-names {
  font-size: 0.84rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  line-height: 1.5;
}

.overview-tool-use {
  font-size: 0.78rem;
  color: var(--text-muted);
}

.overview-link-row {
  margin-bottom: 1rem;
}

.overview-link {
  color: var(--accent-teal);
  font-size: 0.88rem;
  font-weight: 500;
  text-decoration: none;
}

.overview-link:hover {
  text-decoration: underline;
}

.overview-timeline {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.25rem;
}

.overview-timeline-item {
  padding: 1rem 1.15rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.overview-timeline-item h4 {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--accent-amber);
  margin-bottom: 0.6rem;
  letter-spacing: 0.04em;
}

.overview-timeline-item ul {
  margin: 0;
  padding-left: 1.1rem;
  font-size: 0.86rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.overview-timeline-item li { margin-bottom: 0.35rem; }

.overview-life-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.85rem;
  margin-bottom: 1rem;
}

.overview-life-card {
  padding: 1rem;
  text-align: center;
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-card));
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.overview-life-card .theme-icon {
  display: block;
  width: 36px;
  height: 36px;
  margin: 0 auto 0.35rem;
}

.overview-life-card strong {
  display: block;
  font-size: 0.88rem;
  margin-bottom: 0.3rem;
}

.overview-life-card p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.overview-note {
  padding: 0.85rem 1rem;
  background: var(--accent-amber-dim);
  border-left: 3px solid var(--accent-amber);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.84rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

/* Fundamentals */
.fundamentals-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.25rem;
}

.fundamentals-diagram {
  margin: 0 0 2rem;
  padding: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--border);
  background: var(--bg-card);
  box-shadow: var(--shadow-glow);
}

.fundamentals-diagram img {
  display: block;
  width: 100%;
  height: auto;
}

.fundamentals-diagram figcaption {
  padding: 0.85rem 1.25rem;
  font-size: 0.82rem;
  color: var(--text-muted);
  text-align: center;
  border-top: 1px solid var(--border);
  background: var(--bg-elevated);
}

.fundamental-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  transition: var(--transition);
}

.fundamental-card:hover {
  border-color: var(--border-strong);
}

.fundamental-header {
  padding: 1.5rem;
  cursor: pointer;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.fundamental-icon {
  width: 44px;
  height: 44px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 1.25rem;
  flex-shrink: 0;
}

.fundamental-header h3 {
  font-family: var(--font-display);
  font-size: 1.1rem;
  margin-bottom: 0.3rem;
}

.fundamental-header .subtitle {
  font-size: 0.85rem;
  color: var(--text-muted);
}

.fundamental-toggle {
  margin-left: auto;
  color: var(--accent-teal);
  font-size: 1.25rem;
  transition: transform var(--transition);
}

.fundamental-card.open .fundamental-toggle {
  transform: rotate(45deg);
}

.fundamental-body {
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.5s var(--transition);
}

.fundamental-card.open .fundamental-body {
  max-height: 1400px;
}

.fundamental-content .key-points {
  margin-top: 0.75rem;
  padding-left: 1.2rem;
  font-size: 0.9rem;
}

.fundamental-content .key-points li {
  margin-bottom: 0.4rem;
}

.fundamental-content {
  padding: 0 1.5rem 1.5rem 4.4rem;
  color: var(--text-secondary);
  font-size: 0.95rem;
}

.fundamental-content p { margin-bottom: 0.75rem; }

.fundamental-content .analogy {
  margin-top: 1rem;
  padding: 1rem;
  background: var(--accent-teal-dim);
  border-left: 3px solid var(--accent-teal);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  font-size: 0.9rem;
}

/* Concepts flip cards */
.concepts-filter,
.glossary-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.25rem;
}

.concepts-search-wrap {
  display: flex;
  align-items: center;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 2rem;
}

.concepts-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex-shrink: 0;
}

.concepts-flip-all,
.concepts-auto-flip {
  flex-shrink: 0;
  white-space: nowrap;
  font-size: 0.88rem;
  padding: 0.55rem 1rem;
}

.concepts-flip-all[aria-pressed="true"],
.concepts-auto-flip[aria-pressed="true"] {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.concepts-flip-all:disabled {
  opacity: 0.45;
  pointer-events: none;
}

.concepts-auto-flip-on .concept-front .hint {
  color: var(--accent-teal);
}

.terms-count {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.empty-hint {
  grid-column: 1 / -1;
  color: var(--text-muted);
  padding: 2rem;
  text-align: center;
}

.concept-cat-tag {
  font-size: 0.62rem;
  color: var(--accent-amber);
  font-family: var(--font-mono);
  margin-bottom: 0.35rem;
  display: block;
}

.concepts-search {
  width: 100%;
  max-width: 480px;
  padding: 0.9rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  outline: none;
  transition: var(--transition);
}

.concepts-search:focus {
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 3px var(--accent-teal-dim);
}

.concepts-grid {
  display: grid;
  width: 100%;
  grid-template-columns: repeat(auto-fill, minmax(min(100%, 300px), 1fr));
  gap: 1.25rem;
}

.concept-card {
  perspective: 900px;
  height: 320px;
  min-width: 0;
  cursor: pointer;
}

.concept-card.hidden-card { display: none; }

.concept-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.55s var(--transition);
  transform-style: preserve-3d;
}

.concept-card.flipped .concept-inner {
  transform: rotateY(180deg);
}

.concept-front,
.concept-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: var(--radius-md);
  padding: 1.25rem 1.35rem;
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
  gap: 0.4rem;
  overflow: hidden;
}

.concept-front {
  background: var(--bg-card);
  border: 1px solid var(--border);
}

.concept-card:hover .concept-front {
  border-color: var(--border-strong);
  box-shadow: 0 8px 28px rgba(0, 0, 0, 0.18);
}

.concept-front-top {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.concept-abbr {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 600;
  color: var(--bg-deep);
  background: var(--accent-teal);
  padding: 0.15rem 0.45rem;
  border-radius: 4px;
  flex-shrink: 0;
}

.concept-front h4,
.concept-back h4 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.3;
}

.concept-full-en {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-teal);
  line-height: 1.45;
  word-break: break-word;
}

.concept-front .hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-top: auto;
  padding-top: 0.75rem;
}

.concept-back {
  background: linear-gradient(135deg, var(--bg-elevated), var(--bg-card));
  border: 1px solid var(--border-strong);
  transform: rotateY(180deg);
}

.concept-back .concept-front-top { margin-bottom: 0.1rem; }

.concept-back .concept-full-en {
  margin-bottom: 0.35rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border);
}

.concept-back-def {
  font-size: 0.8rem;
  color: var(--text-secondary);
  line-height: 1.5;
  flex: 1;
  min-height: 0;
}

.concept-example {
  margin-top: auto;
  font-size: 0.74rem;
  color: var(--text-muted);
  line-height: 1.45;
  border-top: 1px solid var(--border);
  padding-top: 0.5rem;
  flex-shrink: 0;
}

.concept-back .hint {
  font-size: 0.68rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

/* Apps */
.apps-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.filter-btn {
  padding: 0.5rem 1rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
}

.filter-btn:hover,
.filter-btn.active {
  color: var(--accent-teal);
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.apps-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.25rem;
}

.app-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  transition: var(--transition);
}

.app-card:hover {
  transform: translateY(-4px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow);
}

.app-card.hidden-app { display: none; }

.app-header {
  margin-bottom: 1rem;
}

.app-header .app-software-link {
  margin: 0;
}

.app-full-en {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  margin-bottom: 0.6rem;
}

.app-desc {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.app-features {
  margin: 0 0 0.75rem 1.1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.app-features li { margin-bottom: 0.2rem; }

.app-best-for {
  font-size: 0.82rem;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.app-best-for strong { color: var(--accent-violet); font-weight: 500; }

.app-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-bottom: 1rem;
}

.app-tag {
  font-size: 0.7rem;
  padding: 0.25rem 0.55rem;
  background: var(--bg-elevated);
  border-radius: 100px;
  color: var(--text-muted);
}

.app-tip {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.app-tip strong {
  color: var(--accent-teal);
  font-weight: 500;
}

.section-inline-link {
  display: inline-block;
  margin-left: 0.35rem;
  color: var(--accent-teal);
  text-decoration: none;
  font-weight: 500;
  white-space: nowrap;
}

.section-inline-link:hover {
  text-decoration: underline;
  color: var(--text-primary);
}

/* AI navigation pages */
.ai-nav-page {
  padding-top: 1.5rem;
}

.ai-nav-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 1.75rem;
}

.ai-nav-tab {
  min-width: 7.5rem;
  text-align: center;
  text-decoration: none;
}

/* AI tools directory (Hao123-style) */
.tools-nav-section-header {
  padding-top: 0;
}

.tools-nav-curriculum-link-wrap {
  margin-top: 0.35rem;
}

.tools-nav-curriculum-link {
  color: var(--accent-teal);
  text-decoration: none;
  font-size: 0.9rem;
  font-weight: 500;
}

.tools-nav-curriculum-link:hover {
  text-decoration: underline;
}

.tools-nav-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1rem;
  margin-bottom: 1.25rem;
  padding: 1rem 1.15rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  position: sticky;
  top: calc(var(--header-height) + 0.5rem);
  z-index: 6;
}

.tools-nav-search {
  flex: 1 1 220px;
  min-width: 0;
  padding: 0.65rem 1rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--text-primary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  outline: none;
  transition: var(--transition);
}

.tools-nav-search:focus {
  border-color: var(--accent-teal);
  box-shadow: 0 0 0 3px var(--accent-teal-dim);
}

.tools-nav-stats {
  margin: 0;
  font-size: 0.85rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.tools-nav-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin-bottom: 2rem;
}

.tools-nav-jump-btn {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.75rem;
  font-size: 0.8rem;
  font-weight: 500;
  color: var(--text-secondary);
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  text-decoration: none;
  transition: var(--transition);
}

.tools-nav-jump-btn span {
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg-elevated);
  padding: 0.1rem 0.4rem;
  border-radius: 100px;
}

.tools-nav-jump-btn:hover {
  color: var(--accent-teal);
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.tools-nav-body {
  display: flex;
  flex-direction: column;
  gap: 2.75rem;
}

.tools-nav-category {
  scroll-margin-top: calc(var(--header-height) + 5rem);
}

.tools-nav-category-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  margin-bottom: 1.1rem;
  padding-bottom: 0.65rem;
  border-bottom: 1px solid var(--border);
}

.tools-nav-category-title {
  margin: 0;
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--text-primary);
}

.tools-nav-category-count {
  font-size: 0.8rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.tools-nav-chip-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1rem;
}

.tools-nav-chip {
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
  padding: 1.05rem 1.15rem;
  min-height: 0;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  text-decoration: none;
  color: inherit;
  transition: var(--transition);
}

.tools-nav-chip:hover {
  transform: translateY(-2px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-glow);
  background: var(--bg-elevated);
}

.tools-nav-chip.is-featured {
  border-color: rgba(45, 212, 191, 0.35);
  background: linear-gradient(135deg, var(--bg-card) 0%, var(--accent-teal-dim) 100%);
}

.tools-nav-chip-head {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  min-width: 0;
}

.tools-nav-chip-icon-wrap {
  flex-shrink: 0;
  width: 2rem;
  height: 2rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.tools-nav-chip-icon {
  width: 1.75rem;
  height: 1.75rem;
  object-fit: contain;
}

.tools-nav-chip-name {
  flex: 1;
  min-width: 0;
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
  word-break: break-word;
}

.tools-nav-chip-desc {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--text-secondary);
}

.tools-nav-chip-badge {
  flex-shrink: 0;
  font-size: 0.65rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
  color: var(--accent-teal);
  background: rgba(45, 212, 191, 0.14);
  border: 1px solid rgba(45, 212, 191, 0.28);
  white-space: nowrap;
}

.tools-nav-empty {
  text-align: center;
  color: var(--text-muted);
  padding: 2.5rem 1rem;
  font-size: 0.95rem;
}

/* Agent skills directory */
.skills-nav-section-header {
  padding-top: 0;
}

.skills-nav-card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: 1.1rem;
}

.skills-nav-card {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  padding: 1.1rem 1.2rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.skills-nav-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-elevated);
  box-shadow: var(--shadow-glow);
}

.skills-nav-card-head {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
}

.skills-nav-card-title-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
}

.skills-nav-card-name {
  margin: 0;
  font-size: 1rem;
  font-weight: 600;
  color: var(--text-primary);
  line-height: 1.3;
}

.skills-nav-stars {
  flex-shrink: 0;
  font-size: 0.75rem;
  font-weight: 600;
  color: #f5b942;
  white-space: nowrap;
}

.skills-nav-agents {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
}

.skills-nav-agents-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-right: 0.15rem;
}

.skills-nav-agent-tag {
  font-size: 0.68rem;
  font-weight: 500;
  padding: 0.15rem 0.45rem;
  border-radius: 100px;
  color: var(--accent-teal);
  background: rgba(45, 212, 191, 0.1);
  border: 1px solid rgba(45, 212, 191, 0.22);
}

.skills-nav-card-desc {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--text-secondary);
}

.skills-nav-cmd-wrap {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}

.skills-nav-cmd {
  margin: 0;
  padding: 0.65rem 0.75rem;
  font-family: var(--font-mono, ui-monospace, monospace);
  font-size: 0.76rem;
  line-height: 1.5;
  color: var(--text-primary);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  white-space: pre-wrap;
  word-break: break-all;
}

.skills-nav-copy-btn {
  align-self: flex-start;
  font-size: 0.78rem;
  padding: 0.35rem 0.75rem;
}

.skills-nav-install-note {
  margin: 0;
  font-size: 0.74rem;
  line-height: 1.45;
  color: var(--text-muted);
}

.skills-nav-github-link {
  font-size: 0.82rem;
  font-weight: 500;
  color: var(--accent-teal);
  text-decoration: none;
  margin-top: auto;
}

.skills-nav-github-link:hover {
  text-decoration: underline;
}

@media (max-width: 640px) {
  .skills-nav-card-grid {
    grid-template-columns: 1fr;
  }

  .tools-nav-chip-grid {
    grid-template-columns: 1fr;
    gap: 0.85rem;
  }

  .tools-nav-chip {
    padding: 0.95rem 1rem;
  }

  .tools-nav-chip-head {
    flex-wrap: wrap;
  }

  .tools-nav-chip-badge {
    margin-left: 2.65rem;
  }

  .tools-nav-toolbar {
    top: calc(var(--header-height) + 0.25rem);
  }

  .section-inline-link {
    display: block;
    margin: 0.5rem 0 0;
    white-space: normal;
  }
}

/* Monetize guide */
.monetize-work-types {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 0.75rem;
  margin-bottom: 1.25rem;
}

.monetize-work-card {
  padding: 0.85rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.monetize-work-card strong {
  display: block;
  font-size: 0.88rem;
  color: var(--accent-amber);
  margin-bottom: 0.25rem;
}

.monetize-work-card p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.monetize-principles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.monetize-principle {
  font-size: 0.78rem;
  padding: 0.35rem 0.75rem;
  background: var(--accent-amber-dim);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: 100px;
  color: var(--text-secondary);
}

.monetize-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.monetize-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.monetize-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.monetize-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.monetize-card.hidden-monetize { display: none; }

.monetize-card-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.85rem;
}

.monetize-card-icon {
  flex-shrink: 0;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.monetize-card-title-wrap {
  flex: 1;
  min-width: 0;
}

.monetize-title-row {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  margin-bottom: 0.35rem;
}

.monetize-card-num {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-amber);
  flex-shrink: 0;
}

.monetize-title-row h3 {
  font-size: 1.05rem;
  font-weight: 600;
  min-width: 0;
}

.monetize-card-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.monetize-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.monetize-badge-income {
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.35);
  background: var(--accent-amber-dim);
}

.monetize-card-desc {
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
  margin-bottom: 0.85rem;
}

.monetize-card-block {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
  line-height: 1.5;
}

.monetize-card-block strong {
  color: var(--text-secondary);
  font-weight: 500;
}

.monetize-card-tools {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-bottom: 0.85rem;
}

.monetize-tool-tag {
  font-size: 0.68rem;
  padding: 0.2rem 0.5rem;
  background: var(--bg-elevated);
  border-radius: 100px;
  color: var(--accent-violet);
}

.monetize-card-steps {
  margin: 0 0 0.75rem 1.1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.monetize-card-steps li {
  margin-bottom: 0.25rem;
}

.monetize-card-tip {
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-top: 0.75rem;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

.monetize-card-tip strong {
  color: var(--accent-teal);
  font-weight: 500;
}

/* Device guide */
.device-principles {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 2rem;
}

.device-principle {
  font-size: 0.78rem;
  padding: 0.35rem 0.75rem;
  background: var(--accent-sky-dim);
  border: 1px solid rgba(56, 189, 248, 0.28);
  border-radius: 100px;
  color: var(--text-secondary);
}

.device-subsection {
  margin-bottom: 2.75rem;
}

.device-subtitle {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 0.35rem;
}

.device-subdesc {
  font-size: 0.88rem;
  color: var(--text-muted);
  margin-bottom: 1.1rem;
}

.device-need-picker {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: 0.65rem;
  margin-bottom: 1rem;
}

.device-need-btn {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.25rem;
  padding: 0.85rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  text-align: left;
  color: var(--text-primary);
  font-family: var(--font-body);
  transition: var(--transition);
}

.device-need-btn:hover {
  border-color: rgba(56, 189, 248, 0.4);
}

.device-need-btn.active {
  border-color: var(--accent-sky);
  background: var(--accent-sky-dim);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.2);
}

.device-need-btn strong {
  font-size: 0.88rem;
  display: flex;
  align-items: center;
  gap: 0.35rem;
}

.device-need-btn span {
  font-size: 0.75rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.device-need-result {
  padding: 0.85rem 1.1rem;
  background: var(--bg-elevated);
  border: 1px solid rgba(56, 189, 248, 0.3);
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.55;
}

.device-need-result strong {
  color: var(--accent-sky);
}

.device-os-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 1.25rem;
}

.device-os-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
}

.device-os-card-header {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  margin-bottom: 0.5rem;
}

.device-os-card-header h4 {
  font-size: 1.15rem;
  font-weight: 600;
}

.device-os-tagline {
  font-size: 0.82rem;
  color: var(--accent-sky);
  margin-bottom: 1rem;
}

.device-os-block {
  margin-bottom: 0.85rem;
}

.device-os-block strong {
  display: block;
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}

.device-os-block ul {
  margin: 0 0 0 1.1rem;
  font-size: 0.82rem;
  color: var(--text-muted);
}

.device-os-block li {
  margin-bottom: 0.3rem;
}

.device-os-note {
  font-size: 0.8rem;
  color: var(--text-muted);
  padding: 0.75rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border-left: 3px solid var(--accent-sky);
  line-height: 1.5;
}

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

.device-tier-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem;
}

.device-tier-card.highlight {
  border-color: rgba(56, 189, 248, 0.45);
  background: linear-gradient(145deg, var(--bg-card), rgba(56, 189, 248, 0.06));
}

.device-tier-size {
  font-family: var(--font-mono);
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--accent-sky);
  margin-bottom: 0.15rem;
}

.device-tier-level {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
}

.device-tier-field {
  font-size: 0.8rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  line-height: 1.45;
}

.device-tier-field strong {
  color: var(--text-secondary);
  font-weight: 500;
}

.device-tier-apps {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.35rem;
  margin: 0.5rem 0 0.35rem;
}

.device-tier-apps-label {
  font-size: 0.72rem;
  color: var(--text-muted);
  margin-right: 0.15rem;
}

.device-tier-app-tag {
  font-size: 0.66rem;
  padding: 0.2rem 0.5rem;
  background: var(--bg-elevated);
  border-radius: 100px;
  color: var(--accent-sky);
  border: 1px solid rgba(56, 189, 248, 0.25);
}

.device-tier-verdict {
  font-size: 0.78rem;
  color: var(--accent-teal);
  margin-top: 0.65rem;
  padding-top: 0.65rem;
  border-top: 1px solid var(--border);
  line-height: 1.45;
}

.device-gpu-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1rem;
}

.device-gpu-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 1.1rem;
}

.device-gpu-header {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.5rem;
  margin-bottom: 0.5rem;
}

.device-gpu-header h4 {
  font-size: 0.95rem;
  font-weight: 600;
}

.device-gpu-vram {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--accent-sky);
  white-space: nowrap;
}

.device-gpu-field {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.35rem;
  line-height: 1.45;
}

.device-gpu-field strong {
  color: var(--text-secondary);
}

.device-gpu-verdict {
  font-size: 0.76rem;
  color: var(--text-muted);
  margin-top: 0.55rem;
  padding-top: 0.55rem;
  border-top: 1px solid var(--border);
}

.device-storage-row {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: 0.75rem;
}

.device-storage-chip {
  padding: 0.85rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.device-storage-chip strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.95rem;
  color: var(--accent-sky);
  margin-bottom: 0.35rem;
}

.device-storage-chip p {
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.45;
}

.device-ai-boxes-compare {
  font-size: 0.82rem;
  color: var(--text-muted);
  line-height: 1.55;
  margin: 0 0 1.25rem;
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--accent-violet);
}

.device-ai-box-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(360px, 1fr));
  gap: 1.25rem;
}

.device-ai-box-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.device-ai-box-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.device-ai-box-card.match {
  border-color: rgba(139, 92, 246, 0.55);
  box-shadow: 0 0 0 1px rgba(139, 92, 246, 0.25), var(--shadow-glow);
}

.device-ai-box-card.dimmed {
  opacity: 0.45;
}

.device-ai-box-card:has(.device-preset-badge-dedicated) {
  border-color: rgba(139, 92, 246, 0.28);
  background: linear-gradient(145deg, var(--bg-card), rgba(139, 92, 246, 0.04));
}

.device-ai-box-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.65rem;
}

.device-ai-box-chip {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.5rem;
  line-height: 1.45;
}

.device-ai-box-caps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.4rem;
  margin: 0.65rem 0;
  padding: 0.65rem 0.75rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
  border: 1px solid var(--border);
}

.device-ai-cap {
  font-size: 0.78rem;
  color: var(--text-secondary);
  line-height: 1.45;
}

.device-ai-cap strong {
  color: var(--accent-violet);
  font-weight: 600;
  margin-right: 0.35rem;
}

.device-ai-oem {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
  line-height: 1.5;
}

.device-ai-vs {
  font-size: 0.78rem;
  color: var(--text-muted);
  margin-bottom: 0.65rem;
  line-height: 1.5;
  padding: 0.55rem 0.65rem;
  background: rgba(56, 189, 248, 0.06);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(56, 189, 248, 0.15);
}

.device-ai-vs strong {
  color: var(--accent-sky);
  font-weight: 500;
}

.device-preset-badge-dedicated {
  color: var(--accent-violet);
  border-color: rgba(139, 92, 246, 0.45);
  background: rgba(139, 92, 246, 0.1);
  font-weight: 600;
}

.device-preset-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(340px, 1fr));
  gap: 1.25rem;
}

.device-preset-card {
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.35rem;
  transition: var(--transition);
  display: flex;
  flex-direction: column;
}

.device-preset-card:hover {
  border-color: var(--border-strong);
  transform: translateY(-3px);
  box-shadow: var(--shadow-glow);
}

.device-preset-card.match {
  border-color: rgba(56, 189, 248, 0.55);
  box-shadow: 0 0 0 1px rgba(56, 189, 248, 0.25), var(--shadow-glow);
}

.device-preset-card.dimmed {
  opacity: 0.45;
}

.device-preset-header {
  display: flex;
  align-items: flex-start;
  gap: 0.75rem;
  margin-bottom: 0.75rem;
}

.device-preset-icon {
  flex-shrink: 0;
  background: var(--bg-elevated);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
}

.device-preset-title-wrap h4 {
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.35rem;
}

.device-preset-badges {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
}

.device-preset-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.device-preset-badge-budget {
  color: var(--accent-sky);
  border-color: rgba(56, 189, 248, 0.35);
  background: var(--accent-sky-dim);
}

.device-preset-badge-luxury {
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.45);
  background: var(--accent-amber-dim);
  font-weight: 600;
}

.device-preset-card:has(.device-preset-badge-luxury) {
  border-color: rgba(245, 158, 11, 0.28);
  background: linear-gradient(145deg, var(--bg-card), rgba(245, 158, 11, 0.04));
}

.device-spec-table {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.3rem 0.75rem;
  font-size: 0.78rem;
  margin: 0.75rem 0;
  padding: 0.75rem;
  background: var(--bg-elevated);
  border-radius: var(--radius-sm);
}

.device-spec-table dt {
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.device-spec-table dd {
  color: var(--text-secondary);
  margin: 0;
}

.device-preset-best {
  font-size: 0.85rem;
  color: var(--text-secondary);
  margin-bottom: 0.65rem;
  line-height: 1.5;
}

.device-preset-reasons {
  margin: 0 0 0.75rem 1.1rem;
  font-size: 0.8rem;
  color: var(--text-muted);
}

.device-preset-reasons li {
  margin-bottom: 0.25rem;
}

.device-preset-tradeoff {
  font-size: 0.78rem;
  color: var(--text-muted);
  padding-top: 0.75rem;
  margin-top: auto;
  border-top: 1px solid var(--border);
}

.device-preset-tradeoff strong {
  color: var(--accent-rose);
  font-weight: 500;
}

/* Practice category filters */
.practice-filter-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1rem;
  margin-bottom: 1.5rem;
}

.practice-filter {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  flex: 1;
  min-width: 0;
}

.practice-filter-count {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--text-muted);
  white-space: nowrap;
}

.hands-on-item.hidden-practice-item,
.practice-item.hidden-practice-item {
  display: none;
}

.hands-on-cat-tag,
.practice-cat-tag {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.2rem 0.55rem;
  border-radius: 100px;
  border: 1px solid rgba(167, 139, 250, 0.35);
  color: var(--accent-violet);
  background: rgba(167, 139, 250, 0.1);
}

.practice-cat-tag {
  border-color: rgba(45, 212, 191, 0.35);
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.practice-item-head {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 0.5rem 0.75rem;
  margin-bottom: 0.5rem;
}

.practice-item-head h3 {
  margin-bottom: 0;
}

/* Hands-on walkthroughs */
.hands-on-list {
  display: grid;
  gap: 1.25rem;
  margin-bottom: 4rem;
}

.hands-on-item {
  padding: 1.75rem 2rem;
  background: linear-gradient(135deg, rgba(167, 139, 250, 0.06), var(--bg-card));
  border: 1px solid rgba(167, 139, 250, 0.22);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.hands-on-item:hover {
  border-color: rgba(167, 139, 250, 0.4);
  box-shadow: 0 12px 40px rgba(0, 0, 0, 0.2);
}

.hands-on-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  margin-bottom: 0.85rem;
}

.hands-on-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-violet);
  opacity: 0.45;
  line-height: 1;
}

.hands-on-meta {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.hands-on-software {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  padding: 0.35rem 0.75rem;
  background: var(--accent-violet);
  color: var(--bg-deep);
  font-size: 0.82rem;
  font-weight: 600;
  border-radius: 100px;
  text-decoration: none;
  transition: var(--transition);
}

.hands-on-software:hover {
  filter: brightness(1.08);
  transform: translateY(-1px);
}

.hands-on-badge {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  padding: 0.2rem 0.55rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  color: var(--text-muted);
}

.hands-on-badge-time {
  color: var(--accent-teal);
  border-color: rgba(45, 212, 191, 0.3);
}

.hands-on-item h3 {
  font-family: var(--font-display);
  font-size: 1.2rem;
  margin-bottom: 0.5rem;
}

.hands-on-desc {
  color: var(--text-secondary);
  font-size: 0.92rem;
  margin-bottom: 0.85rem;
  line-height: 1.6;
}

.hands-on-steps {
  margin: 0 0 1rem 1.2rem;
  font-size: 0.86rem;
  color: var(--text-muted);
  line-height: 1.55;
}

.hands-on-steps li { margin-bottom: 0.35rem; }

.hands-on-result {
  font-size: 0.86rem;
  color: var(--text-secondary);
  padding: 0.75rem 1rem;
  background: var(--accent-teal-dim);
  border-left: 3px solid var(--accent-teal);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
  margin-bottom: 0.75rem;
}

.hands-on-result strong { color: var(--accent-teal); }

.hands-on-tips {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
  line-height: 1.5;
}

.hands-on-tips strong { color: var(--accent-amber); }

.hands-on-prompt-block { margin-top: 0.25rem; }

/* Practice */
.practice-list {
  display: grid;
  gap: 1rem;
}

.practice-item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 1.5rem;
  padding: 1.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  transition: var(--transition);
}

.practice-item:hover {
  border-color: var(--border-strong);
}

.practice-num {
  font-family: var(--font-display);
  font-size: 2rem;
  font-weight: 700;
  color: var(--accent-teal);
  opacity: 0.4;
  line-height: 1;
}

.practice-item h3 {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 0.5rem;
}

.practice-item .tools {
  font-size: 0.85rem;
  color: var(--accent-amber);
  margin-bottom: 0.75rem;
}

.practice-item p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 0.75rem;
}

.practice-steps {
  margin: 0 0 0.75rem 1.2rem;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.practice-steps li { margin-bottom: 0.25rem; }

.practice-prompt-block {
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: var(--bg-deep);
}

.practice-prompt-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 0.6rem 1rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.practice-copy-btn { flex-shrink: 0; }

.btn-copy.copied {
  background: var(--accent-teal);
  color: var(--bg-deep);
  border-color: var(--accent-teal);
}

.practice-prompt {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  padding: 1rem;
  margin: 0;
  background: var(--bg-deep);
  color: var(--text-muted);
  border-left: 2px solid var(--accent-violet);
  white-space: pre-wrap;
  word-break: break-word;
}

/* Prompt Lab — unified studio */
.prompt-studio {
  background: var(--bg-card);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-glow);
}

.prompt-studio-toolbar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.75rem 1rem;
  background: var(--bg-elevated);
  border-bottom: 1px solid var(--border);
}

.prompt-studio-toolbar-main {
  display: flex;
  align-items: center;
  gap: 0.65rem;
  flex: 1;
  min-width: 0;
}

.prompt-studio-toolbar-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

.prompt-studio-toolbar-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex-shrink: 0;
}

.prompt-cases {
  display: flex;
  flex-wrap: nowrap;
  gap: 0.45rem;
  overflow-x: auto;
  min-width: 0;
  flex: 1;
  padding-bottom: 2px;
  scrollbar-width: thin;
}

.prompt-case-card {
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 0.35rem;
  padding: 0.4rem 0.7rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: 100px;
  cursor: pointer;
  text-align: left;
  transition: var(--transition);
  font-family: var(--font-body);
  color: var(--text-primary);
}

.prompt-case-card:hover {
  border-color: var(--border-strong);
  background: var(--bg-elevated);
}

.prompt-case-card.active {
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.prompt-case-emoji {
  width: 28px;
  height: 28px;
  flex-shrink: 0;
  object-fit: contain;
}

.prompt-case-title {
  font-size: 0.8rem;
  font-weight: 600;
  white-space: nowrap;
}

.prompt-case-scene {
  display: none;
}

.prompt-studio-body {
  display: grid;
  grid-template-columns: minmax(260px, 300px) minmax(0, 1fr);
  height: min(720px, 78vh);
  min-height: 580px;
}

.prompt-studio-form {
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.85rem 1rem 1rem;
  border-right: 1px solid var(--border);
  overflow-y: auto;
  background: var(--bg-surface);
}

.prompt-studio-form-title {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-secondary);
  margin-bottom: 0.35rem;
}

.prompt-studio-form label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--text-muted);
  margin-top: 0.45rem;
}

.prompt-studio-form label:first-of-type { margin-top: 0; }

.prompt-studio-form input,
.prompt-studio-form select,
.prompt-studio-form textarea {
  padding: 0.6rem 0.75rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.88rem;
  outline: none;
  transition: var(--transition);
  resize: vertical;
}

.prompt-studio-form input:focus,
.prompt-studio-form select:focus,
.prompt-studio-form textarea:focus {
  border-color: var(--accent-teal);
}

.prompt-studio-submit {
  margin-top: 0.75rem;
  width: 100%;
}

.prompt-studio-submit:disabled,
.btn-copy:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

.prompt-studio-chat {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  background: var(--bg-card);
}

.prompt-studio-chat-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem;
  padding: 0.65rem 1rem;
  border-bottom: 1px solid var(--border);
  background: var(--bg-elevated);
  flex-shrink: 0;
}

.prompt-studio-chat-scroll {
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  padding: 1rem;
}

.btn-icon { margin-right: 0.25rem; }

.prompt-guide {
  margin-top: 0.85rem;
  padding: 0.9rem 1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  animation: fadeSlideIn 0.35s var(--transition);
}

@keyframes fadeSlideIn {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: translateY(0); }
}

.prompt-guide h4 {
  font-size: 0.88rem;
  margin-bottom: 0.65rem;
  color: var(--accent-teal);
}

.guide-steps {
  margin: 0 0 1rem 1.2rem;
  font-size: 0.88rem;
  color: var(--text-secondary);
  line-height: 1.7;
}

.guide-steps li { margin-bottom: 0.35rem; }

.guide-steps strong { color: var(--text-primary); }

.guide-tools {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding-top: 0.75rem;
  border-top: 1px solid var(--border);
}

.guide-tools-label {
  font-size: 0.8rem;
  color: var(--text-muted);
}

.guide-tool-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
}

.guide-tool-tag {
  font-size: 0.75rem;
  padding: 0.3rem 0.65rem;
  background: var(--accent-teal-dim);
  border: 1px solid var(--border-strong);
  border-radius: 100px;
  color: var(--accent-teal);
}

.guide-link-btn {
  display: inline-flex;
  margin-top: 1rem;
  padding: 0.55rem 1rem;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  text-decoration: none;
  transition: var(--transition);
}

.guide-link-btn:hover {
  background: var(--accent-teal);
  color: var(--bg-deep);
}

.sim-header-left {
  display: flex;
  align-items: center;
  gap: 0.6rem;
}

.sim-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--accent-teal);
  animation: pulse-mark 2s ease-in-out infinite;
}

.sim-title {
  font-weight: 600;
  font-size: 0.9rem;
}

.sim-badge {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--accent-amber);
  background: var(--accent-amber-dim);
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
}

.sim-reset {
  font-size: 0.75rem;
  padding: 0.35rem 0.7rem;
}

.sim-messages {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-height: 280px;
}

.sim-empty {
  margin: auto;
  max-width: 320px;
  text-align: center;
  color: var(--text-muted);
  padding: 2rem 1rem;
}

.sim-empty-icon {
  display: block;
  width: 48px;
  height: 48px;
  margin: 0 auto 0.75rem;
  opacity: 0.85;
  object-fit: contain;
}

.sim-empty strong {
  display: block;
  color: var(--text-secondary);
  margin-bottom: 0.5rem;
}

.sim-empty p {
  font-size: 0.85rem;
  line-height: 1.6;
  margin: 0;
}

.sim-followup-chips {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  padding: 0 1rem 0.6rem;
  flex-shrink: 0;
}

.sim-chips-label {
  font-size: 0.75rem;
  color: var(--text-muted);
}

.sim-chip {
  font-size: 0.75rem;
  padding: 0.35rem 0.7rem;
  border-radius: 100px;
  border: 1px solid var(--border);
  background: var(--bg-elevated);
  color: var(--text-secondary);
  cursor: pointer;
  transition: var(--transition);
  font-family: var(--font-body);
}

.sim-chip:hover {
  border-color: var(--accent-teal);
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.sim-msg {
  max-width: 88%;
  padding: 0.85rem 1.1rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}

.sim-msg-user {
  align-self: flex-end;
  background: var(--accent-teal-dim);
  border: 1px solid var(--border-strong);
  color: var(--text-primary);
  border-bottom-right-radius: 4px;
}

.sim-msg-ai {
  align-self: flex-start;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  color: var(--text-secondary);
  border-bottom-left-radius: 4px;
}

.sim-msg-error {
  align-self: center;
  max-width: 100%;
  background: rgba(251, 113, 133, 0.12);
  border: 1px solid rgba(251, 113, 133, 0.35);
  color: var(--accent-rose);
}

.sim-msg-label {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  color: var(--text-muted);
  margin-bottom: 0.4rem;
  display: block;
}

.sim-typing {
  display: inline-flex;
  gap: 4px;
  padding: 0.85rem 1.1rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  align-self: flex-start;
}

.sim-typing span {
  width: 6px;
  height: 6px;
  background: var(--accent-teal);
  border-radius: 50%;
  animation: typingBounce 1.2s ease-in-out infinite;
}

.sim-typing span:nth-child(2) { animation-delay: 0.15s; }
.sim-typing span:nth-child(3) { animation-delay: 0.3s; }

.sim-text {
  display: inline;
}

.sim-cursor {
  display: inline-block;
  width: 2px;
  height: 1.05em;
  margin-left: 2px;
  vertical-align: text-bottom;
  background: var(--accent-teal);
  animation: simCursorBlink 0.85s step-end infinite;
}

@keyframes simCursorBlink {
  0%, 45% { opacity: 1; }
  50%, 100% { opacity: 0; }
}

@keyframes typingBounce {
  0%, 60%, 100% { transform: translateY(0); opacity: 0.4; }
  30% { transform: translateY(-4px); opacity: 1; }
}

.sim-input-row {
  display: flex;
  gap: 0.6rem;
  padding: 0.75rem 1rem;
  border-top: 1px solid var(--border);
  background: var(--bg-surface);
  flex-shrink: 0;
}

.sim-input-row input {
  flex: 1;
  padding: 0.7rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  outline: none;
}

.sim-input-row input:focus { border-color: var(--accent-teal); }

.sim-input-row input:disabled { opacity: 0.5; }

.sim-input-row .btn {
  padding: 0.7rem 1.2rem;
  font-size: 0.85rem;
  white-space: nowrap;
}

.sim-disclaimer {
  padding: 0.55rem 1rem 0.7rem;
  font-size: 0.72rem;
  color: var(--text-muted);
  background: var(--bg-surface);
  border-top: 1px solid var(--border);
  line-height: 1.45;
  flex-shrink: 0;
}

.output-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 1.25rem;
  border-bottom: 1px solid var(--border);
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--text-secondary);
}

.btn-copy {
  padding: 0.4rem 0.85rem;
  font-size: 0.8rem;
  background: var(--accent-teal-dim);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius-sm);
  color: var(--accent-teal);
  cursor: pointer;
  transition: var(--transition);
}

.btn-copy:hover:not(:disabled) {
  background: var(--accent-teal);
  color: var(--bg-deep);
}

.btn-copy:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.prompt-result {
  padding: 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--text-secondary);
  white-space: pre-wrap;
  word-break: break-word;
  min-height: 280px;
  margin: 0;
}

/* Quiz */
.quiz-container {
  width: 100%;
  background: linear-gradient(135deg, rgba(251, 113, 133, 0.06), var(--bg-card));
  border: 1px solid rgba(251, 113, 133, 0.22);
  border-radius: var(--radius-lg);
  padding: 2rem 2.25rem;
  box-shadow: 0 8px 32px rgba(0, 0, 0, 0.15);
}

.quiz-start {
  text-align: center;
}

.quiz-prelude {
  position: relative;
  max-width: 40rem;
  margin: 0 auto;
  padding: 0.5rem 0 0.25rem;
}

.quiz-prelude-glow {
  position: absolute;
  inset: -20% 10% auto;
  height: 12rem;
  background: radial-gradient(ellipse 70% 80% at 50% 0%, rgba(251, 113, 133, 0.18), transparent 70%);
  pointer-events: none;
}

.quiz-prelude-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent-rose);
  margin-bottom: 1rem;
}

.quiz-prelude-badge img {
  width: 1rem;
  height: 1rem;
  object-fit: contain;
}

.quiz-prelude-title {
  font-family: var(--font-display);
  font-size: clamp(1.45rem, 3.2vw, 1.9rem);
  font-weight: 600;
  line-height: 1.35;
  margin-bottom: 0.85rem;
  color: var(--text-primary);
}

.quiz-prelude-lead {
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-secondary);
  margin-bottom: 1.35rem;
  text-align: left;
}

.quiz-prelude-journey {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: center;
  gap: 0.35rem 0.5rem;
  margin-bottom: 1.5rem;
  padding: 0.85rem 1rem;
  background: rgba(251, 113, 133, 0.06);
  border: 1px solid rgba(251, 113, 133, 0.18);
  border-radius: var(--radius-md);
}

.quiz-prelude-step {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  font-size: 0.78rem;
  color: var(--text-muted);
}

.quiz-prelude-step.is-done {
  color: var(--text-secondary);
}

.quiz-prelude-step.is-current {
  color: var(--accent-rose);
  font-weight: 600;
}

.quiz-prelude-step-num {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  opacity: 0.85;
}

.quiz-prelude-step-arrow {
  color: var(--text-muted);
  font-size: 0.75rem;
  opacity: 0.6;
}

.quiz-prelude-divider {
  display: flex;
  align-items: center;
  justify-content: center;
  margin: 0 auto 1.35rem;
  max-width: 18rem;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(251, 113, 133, 0.45), transparent);
}

.quiz-prelude-divider span {
  display: block;
  width: 6px;
  height: 6px;
  margin-top: -3px;
  background: var(--accent-rose);
  border-radius: 50%;
  box-shadow: 0 0 12px rgba(251, 113, 133, 0.5);
}

.quiz-prelude-purpose-title {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 600;
  margin-bottom: 0.55rem;
  color: var(--text-primary);
}

.quiz-prelude-purpose {
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-secondary);
  margin-bottom: 0.55rem;
  text-align: left;
}

.quiz-prelude-purpose-sub {
  font-size: 0.84rem;
  line-height: 1.65;
  color: var(--text-muted);
  margin-bottom: 1.25rem;
  text-align: left;
}

.quiz-prelude-stats {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.65rem;
  margin-bottom: 1.35rem;
}

.quiz-prelude-stats li {
  padding: 0.75rem 0.55rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  font-size: 0.78rem;
  color: var(--text-muted);
  line-height: 1.4;
}

.quiz-prelude-stats strong {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-teal);
  margin-bottom: 0.15rem;
}

.quiz-prelude-hint {
  font-size: 0.82rem;
  color: var(--accent-amber);
  margin-bottom: 1rem;
  padding: 0.65rem 0.85rem;
  background: var(--accent-amber-dim);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(245, 158, 11, 0.25);
  text-align: left;
}

.quiz-prelude-actions {
  margin-top: 0.25rem;
}

.quiz-prelude-cta {
  min-width: 14rem;
  padding: 0.85rem 1.75rem;
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: 0.02em;
}

.quiz-prelude-graduated {
  margin-top: 1rem;
  font-size: 0.84rem;
  color: var(--accent-teal);
  line-height: 1.55;
}

.quiz-prelude--graduated .quiz-prelude-lead {
  opacity: 0.92;
}

.hidden { display: none !important; }

.quiz-progress {
  display: flex;
  align-items: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.quiz-progress span {
  font-family: var(--font-mono);
  font-size: 0.8rem;
  color: var(--accent-teal);
  white-space: nowrap;
}

.quiz-bar {
  flex: 1;
  height: 4px;
  background: var(--bg-elevated);
  border-radius: 2px;
  overflow: hidden;
}

.quiz-bar-fill {
  height: 100%;
  background: var(--accent-teal);
  transition: width 0.4s var(--transition);
}

.quiz-question {
  font-family: var(--font-display);
  font-size: 1.25rem;
  margin-bottom: 1.5rem;
  line-height: 1.4;
}

.quiz-options {
  display: grid;
  gap: 0.75rem;
  margin-bottom: 1.5rem;
}

.quiz-option {
  padding: 1rem 1.25rem;
  text-align: left;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.95rem;
  cursor: pointer;
  transition: var(--transition);
}

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

.quiz-option.correct {
  border-color: var(--accent-teal);
  background: var(--accent-teal-dim);
}

.quiz-option.wrong {
  border-color: var(--accent-rose);
  background: rgba(251, 113, 133, 0.1);
}

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

.quiz-feedback {
  padding: 1rem;
  border-radius: var(--radius-sm);
  font-size: 0.9rem;
  margin-bottom: 1rem;
  line-height: 1.5;
}

.quiz-feedback.correct-fb {
  background: var(--accent-teal-dim);
  border-left: 3px solid var(--accent-teal);
  color: var(--text-secondary);
}

.quiz-feedback.wrong-fb {
  background: rgba(251, 113, 133, 0.08);
  border-left: 3px solid var(--accent-rose);
  color: var(--text-secondary);
}

.quiz-result {
  text-align: center;
}

.result-score {
  font-family: var(--font-display);
  font-size: 3.5rem;
  font-weight: 700;
  color: var(--accent-teal);
  margin-bottom: 0.5rem;
}

.result-message {
  color: var(--text-secondary);
  margin-bottom: 1.5rem;
}

.quiz-review {
  text-align: left;
  margin: 0 0 1.5rem;
  padding: 1.25rem 1.5rem;
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
}

.quiz-review h4 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin-bottom: 0.35rem;
  color: var(--accent-rose);
}

.quiz-review-hint {
  font-size: 0.82rem;
  color: var(--text-muted);
  margin-bottom: 1rem;
}

.quiz-review-list {
  list-style: none;
  display: grid;
  gap: 0.85rem;
}

.quiz-review-item {
  padding: 0.85rem 1rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.quiz-review-q {
  font-size: 0.9rem;
  color: var(--text-primary);
  margin-bottom: 0.35rem;
  line-height: 1.5;
}

.quiz-review-a {
  font-size: 0.82rem;
  color: var(--accent-teal);
  margin-bottom: 0.5rem;
}

.quiz-review-link {
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--accent-amber);
  text-decoration: none;
}

.quiz-review-link:hover {
  text-decoration: underline;
}

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

/* Glossary */
.glossary-list {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}

.glossary-group-title {
  font-family: var(--font-display);
  font-size: 1.15rem;
  margin-bottom: 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.glossary-group-count {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--accent-teal);
  background: var(--accent-teal-dim);
  padding: 0.2rem 0.5rem;
  border-radius: 100px;
}

.glossary-group-items {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 0.75rem;
}

.glossary-item {
  padding: 1rem 1.25rem;
  background: var(--bg-card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.glossary-item dt {
  font-weight: 600;
  font-size: 0.9rem;
  margin-bottom: 0.2rem;
}

.glossary-abbr {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  color: var(--accent-teal);
  font-weight: 500;
}

.glossary-en {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--accent-amber);
  margin-bottom: 0.3rem;
}

.glossary-item dd:last-child {
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 3rem 2rem;
  margin-top: 2rem;
  position: relative;
  z-index: 1;
}

.footer-inner {
  max-width: 1280px;
  margin: 0 auto;
}

.footer-brand {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-weight: 600;
  margin-bottom: 0.75rem;
}

.footer-brand-text {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.footer-domain {
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--accent-teal);
  text-decoration: none;
  letter-spacing: 0.01em;
}

.footer-domain:hover {
  color: var(--text-primary);
  text-decoration: underline;
}

.footer-inner p {
  color: var(--text-muted);
  font-size: 0.9rem;
  max-width: 480px;
}

.footer-note {
  margin-top: 1rem;
  font-size: 0.8rem !important;
}

/* Responsive */
@media (prefers-reduced-motion: reduce) {
  .reveal { opacity: 1; transform: none; transition: none; }
}

@media (max-width: 1024px) {
  .main-nav {
    position: fixed;
    top: var(--header-height);
    left: 0;
    right: 0;
    flex: none;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0.15rem;
    overflow-x: visible;
    background: rgba(6, 10, 16, 0.98);
    padding: 0.65rem 1rem 0.85rem;
    border-bottom: 1px solid var(--border);
    transform: translateY(-120%);
    opacity: 0;
    pointer-events: none;
    transition: var(--transition);
    z-index: 99;
  }

  .main-nav.open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .main-nav a {
    font-size: 0.9rem;
    padding: 0.65rem 0.85rem;
  }

  .nav-toggle {
    display: flex;
  }

  .hero {
    padding: 4.75rem 0 1.75rem;
  }

  .hero-inner {
    grid-template-columns: 1fr;
    text-align: center;
    gap: 1.25rem;
    padding: 0 1.25rem;
  }

  .hero-backdrop,
  .roadmap-backdrop {
    left: 50%;
    width: 100vw;
    transform: translateX(-50%);
  }

  .hero-backdrop {
    min-height: 360px;
  }

  .hero-desc { margin-left: auto; margin-right: auto; }
  .hero-actions { justify-content: center; }
  .hero-visual { order: -1; }
  .roadmap-grid { grid-template-columns: repeat(2, 1fr); }
  .phase-banner { flex-wrap: wrap; }
  .phase-progress { margin-left: 0; }
  .header-progress { display: none; }
  .header-continue { display: none; }
  .header-user { display: none; }
  .teacher-coach { left: 1rem; right: 1rem; max-width: none; bottom: 1rem; }
  .teacher-coach.collapsed { left: auto; right: 1rem; width: auto; }

  .page-reader-btn {
    left: 1rem;
    bottom: max(6.25rem, calc(5.25rem + env(safe-area-inset-bottom, 0px)));
  }

  .page-reader-status {
    left: 1rem;
    bottom: max(9rem, calc(8rem + env(safe-area-inset-bottom, 0px)));
  }

  .prompt-studio-body {
    grid-template-columns: 1fr;
    height: auto;
    min-height: 0;
  }

  .prompt-studio-form {
    border-right: none;
    border-bottom: 1px solid var(--border);
    max-height: 380px;
  }

  .prompt-studio-chat {
    height: min(620px, 68vh);
    min-height: 520px;
  }

  .prompt-studio-toolbar {
    flex-direction: column;
    align-items: stretch;
  }

  .prompt-studio-toolbar-actions {
    justify-content: flex-end;
  }
}

@media (max-width: 768px) {
  .site-header {
    height: auto;
    min-height: calc(var(--header-height) + env(safe-area-inset-top, 0px));
    padding: max(0.35rem, env(safe-area-inset-top, 0px)) 1rem 0.35rem;
  }

  .header-inner { gap: 0.5rem; }
  .logo { font-size: 0.72rem; gap: 0.35rem; }
  .logo-mark { width: 1.15rem; height: 1.15rem; }

  /* iPhone 首屏 Hero：上（路径）· 中（文案）· 下（按钮）三区分布，填满一屏不浪费 */
  .hero {
    display: flex;
    flex-direction: column;
    justify-content: flex-start;
    align-items: stretch;
    min-height: 100svh;
    min-height: 100dvh;
    padding:
      calc(4rem + env(safe-area-inset-top, 0px))
      0
      calc(2.25rem + env(safe-area-inset-bottom, 0px));
    gap: 0;
    box-sizing: border-box;
  }

  .hero-inner {
    display: flex;
    flex-direction: column;
    flex: 1;
    min-height: 0;
    gap: 0;
    padding-left: max(1.25rem, env(safe-area-inset-left, 0px));
    padding-right: max(1.25rem, env(safe-area-inset-right, 0px));
  }

  .hero-backdrop {
    min-height: 100%;
  }

  .hero-visual {
    order: -1;
    flex-shrink: 0;
    margin-bottom: 0;
  }

  .hero-content {
    display: grid;
    grid-template-rows: minmax(0, 0.9fr) auto auto auto minmax(0, 1.1fr) auto;
    flex: 1;
    min-height: 0;
    text-align: center;
    align-items: center;
  }

  .hero-eyebrow {
    grid-row: 2;
    font-size: 0.74rem;
    margin-bottom: clamp(0.75rem, 2.2vh, 1.1rem);
    letter-spacing: 0.05em;
  }

  .hero-title {
    grid-row: 3;
    font-size: clamp(1.8rem, 7.2vw, 2.35rem);
    line-height: 1.14;
    margin-bottom: clamp(0.85rem, 2.5vh, 1.25rem);
  }

  .hero-desc {
    grid-row: 4;
    font-size: 0.94rem;
    line-height: 1.58;
    margin-bottom: 0;
    max-width: 34em;
    margin-left: auto;
    margin-right: auto;
    display: block;
    overflow: visible;
  }

  .hero-actions {
    grid-row: 6;
    gap: 0.7rem;
    flex-wrap: nowrap;
    margin-top: 0;
    padding-top: 0;
    width: 100%;
  }

  .hero-actions .btn {
    flex: 1;
    min-width: 0;
    padding: 0.8rem 0.85rem;
    font-size: 0.9rem;
  }

  .section { padding: 3rem 1rem; }
  .roadmap-section { padding: 2rem 0 3rem; }
  .roadmap-section > :not(.roadmap-backdrop) { padding-left: 1rem; padding-right: 1rem; }
  .phase-banner { padding: 1.5rem 1rem 0; gap: 0.85rem; }
  .phase-banner.has-page-poster {
    min-height: 180px;
    padding: 1.75rem 1rem 1.25rem;
    border-radius: 0;
    margin-left: -0.25rem;
    margin-right: -0.25rem;
  }
  .phase-num { font-size: 2rem; }
  .hands-on-item { padding: 1.25rem 1rem; }
  .quiz-container { padding: 1.5rem 1rem; }
  .quiz-prelude-stats { grid-template-columns: 1fr; }
  .quiz-prelude-journey { justify-content: flex-start; }
  .practice-item { padding: 1.25rem 1rem; }

  .path-day {
    grid-template-columns: 1fr auto;
    gap: 0.85rem 0.75rem;
    padding: 1.25rem 1rem;
  }

  .path-day-num { grid-column: 1; }
  .path-check { grid-column: 2; grid-row: 1 / span 2; align-self: start; }
  .path-day > div:not(.path-day-num) { grid-column: 1; }

  .graduation-stats { grid-template-columns: repeat(2, 1fr); }
  .practice-plan-weeks { grid-template-columns: 1fr; }
  .graduation-banner { margin-left: 1rem; margin-right: 1rem; }

  .welcome-modal { padding: 1.25rem; max-height: calc(100dvh - 2rem); overflow-y: auto; }
  .welcome-flow { flex-wrap: wrap; justify-content: center; gap: 0.5rem; }
  .welcome-flow-arrow { display: none; }
  .welcome-flow-item { min-width: calc(50% - 0.35rem); flex: 1 1 calc(50% - 0.35rem); }

  .concepts-grid { grid-template-columns: 1fr; }
  .roadmap-grid { grid-template-columns: 1fr; }

  .flow-preview {
    flex-wrap: nowrap;
    gap: 0.28rem;
    width: 100%;
    max-width: 100%;
  }

  .flow-step {
    flex: 1;
    min-width: 0;
    padding: 0.58rem 0.32rem;
    font-size: 0.72rem;
    gap: 0.2rem;
    border-radius: var(--radius-md);
  }

  .flow-step span {
    font-size: 1.02rem;
    line-height: 1;
  }

  .flow-arrow {
    flex-shrink: 0;
    font-size: 0.72rem;
    transform: none;
    opacity: 0.75;
  }

  .apps-grid { grid-template-columns: 1fr; }
  .monetize-grid { grid-template-columns: 1fr; }
  .device-preset-grid,
  .device-ai-box-grid { grid-template-columns: 1fr; }
  .device-need-picker { grid-template-columns: repeat(2, 1fr); }
  .device-os-grid { grid-template-columns: 1fr; }
  .overview-tool-grid { grid-template-columns: 1fr; }
  .overview-nav { top: var(--header-height); }

  .concepts-search,
  .welcome-name-input,
  .teacher-coach-search-input,
  .prompt-studio-form input,
  .prompt-studio-form select,
  .prompt-studio-form textarea,
  .sim-input-row input {
    font-size: 16px;
  }

  .teacher-coach {
    bottom: max(1rem, env(safe-area-inset-bottom, 0px));
  }

  /* iPhone SE / 短屏：适度收紧，仍保持三区分布 */
  @media (max-height: 700px) {
    .hero {
      padding-top: calc(3.5rem + env(safe-area-inset-top, 0px));
      padding-bottom: calc(1.5rem + env(safe-area-inset-bottom, 0px));
    }

    .hero-title {
      font-size: clamp(1.55rem, 6vw, 1.9rem);
      margin-bottom: 0.65rem;
    }

    .hero-desc { font-size: 0.86rem; }

    .hero-actions .btn {
      padding: 0.68rem 0.65rem;
      font-size: 0.84rem;
    }

    .flow-step {
      padding: 0.48rem 0.22rem;
      font-size: 0.66rem;
    }

    .flow-step span { font-size: 0.92rem; }
  }

  /* iPhone Pro Max 宽屏：舒展排版 */
  @media (min-width: 414px) and (max-width: 768px) {
    .hero-title { font-size: clamp(1.95rem, 6.5vw, 2.45rem); }
    .hero-desc { font-size: 1rem; }
    .flow-step { font-size: 0.76rem; padding: 0.62rem 0.38rem; }
    .flow-step span { font-size: 1.08rem; }
  }

  .fundamentals-grid { grid-template-columns: 1fr; }
  .path-day { grid-template-columns: 1fr; gap: 0.75rem; }
  .path-check { justify-self: start; }
  .practice-item { grid-template-columns: 1fr; }
  .practice-num { font-size: 1.5rem; }
}

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
  html { scroll-behavior: auto; }
}