:root {
  color-scheme: light;
  --bg: oklch(99% 0.003 220);
  --surface: oklch(100% 0 0);
  --surface-2: oklch(96.5% 0.006 220);
  --surface-3: oklch(93.5% 0.008 220);
  --fg: oklch(20% 0.018 250);
  --muted: oklch(50% 0.012 250);
  --muted-2: oklch(68% 0.01 250);
  --border: oklch(90% 0.006 220);
  --border-strong: oklch(78% 0.01 250);
  --accent: oklch(52% 0.15 240);
  --accent-soft: color-mix(in oklab, var(--accent) 16%, transparent);
  --accent-deep: oklch(38% 0.11 240);
  --accent-2: oklch(68% 0.14 65);
  --accent-2-soft: color-mix(in oklab, var(--accent-2) 20%, white);
  --accent-2-deep: oklch(52% 0.14 65);
  --success: oklch(56% 0.14 150);
  --success-soft: color-mix(in oklab, var(--success) 18%, white);
  --warning: oklch(66% 0.16 70);
  --warning-soft: color-mix(in oklab, var(--warning) 18%, white);
  --danger: oklch(58% 0.18 25);
  --danger-soft: color-mix(in oklab, var(--danger) 16%, white);
  --code-bg: oklch(18% 0.018 250);
  --code-fg: oklch(95% 0.005 250);
  --shadow-lift:
    0 28px 60px -42px oklch(24% 0.03 250 / 0.55),
    0 12px 24px -18px oklch(24% 0.03 250 / 0.22);
  --r-sm: 8px;
  --r-md: 14px;
  --r-lg: 20px;
  --content-max: 1600px;
  --hero-max: 1920px;
  --sidebar-w: 264px;
  --font-main: "Nunito", "jf-openhuninn-1.1", "jf-openhuninn", "Microsoft JhengHei", "PingFang TC", system-ui, sans-serif;
}

[data-theme="dark"] {
  color-scheme: dark;
  --bg: oklch(17% 0.016 250);
  --surface: oklch(22% 0.016 250);
  --surface-2: oklch(26% 0.016 250);
  --surface-3: oklch(30% 0.016 250);
  --fg: oklch(96% 0.005 250);
  --muted: oklch(72% 0.01 250);
  --muted-2: oklch(58% 0.01 250);
  --border: oklch(30% 0.012 250);
  --border-strong: oklch(42% 0.014 250);
  --accent: oklch(68% 0.16 250);
  --accent-deep: oklch(82% 0.12 250);
  --accent-soft: color-mix(in oklab, var(--accent) 26%, transparent);
  --accent-2: oklch(78% 0.13 65);
  --accent-2-deep: oklch(86% 0.11 65);
  --accent-2-soft: color-mix(in oklab, var(--accent-2) 24%, transparent);
  --success: oklch(68% 0.16 150);
  --success-soft: color-mix(in oklab, var(--success) 22%, transparent);
  --warning: oklch(80% 0.14 75);
  --warning-soft: color-mix(in oklab, var(--warning) 22%, transparent);
  --danger: oklch(70% 0.18 25);
  --danger-soft: color-mix(in oklab, var(--danger) 20%, transparent);
  --code-bg: oklch(12% 0.012 250);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: var(--font-main);
  color: var(--fg);
  background:
    radial-gradient(circle at top left, color-mix(in oklab, var(--accent-2) 22%, transparent), transparent 34%),
    radial-gradient(circle at top right, color-mix(in oklab, var(--accent) 16%, transparent), transparent 30%),
    linear-gradient(180deg, var(--bg), color-mix(in oklab, var(--bg) 90%, var(--surface)));
  overflow-x: hidden;
}

body,
button,
input {
  font: inherit;
}

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

a {
  color: inherit;
}

code {
  border-radius: 8px;
  padding: 2px 7px;
  background: color-mix(in oklab, var(--surface-3) 72%, transparent);
}

.shell {
  min-height: 100vh;
  margin-left: var(--sidebar-w);
}

.sidebar {
  position: fixed;
  inset: 0 auto 0 0;
  z-index: 100;
  width: var(--sidebar-w);
  height: 100vh;
  padding: 24px 16px;
  overflow-y: auto;
  background: color-mix(in oklab, var(--surface) 82%, transparent);
  border-right: 1px solid var(--border);
  backdrop-filter: blur(18px) saturate(140%);
}

.sidebar-close-btn,
.sidebar-restore-btn,
.top-theme-toggle,
.top-action-button,
.copy-code-btn,
.prompt-copy-btn,
.quiz-submit-btn {
  border: 1px solid var(--border);
  cursor: pointer;
  transition: 160ms ease;
}

.sidebar-close-btn {
  position: absolute;
  top: 14px;
  right: 12px;
  width: 28px;
  height: 28px;
  padding: 0;
  border-radius: 8px;
  background: var(--surface-2);
  color: var(--muted);
  font-weight: 700;
}

.sidebar-restore-btn {
  display: none;
  position: fixed;
  top: 12px;
  left: 12px;
  z-index: 200;
  padding: 6px 14px;
  border-radius: 10px;
  background: var(--surface-2);
  color: var(--fg);
  font-size: 0.85rem;
  font-weight: 700;
}

body.sidebar-hidden .shell {
  margin-left: 0;
}

body.sidebar-hidden .sidebar {
  display: none;
}

body.sidebar-hidden .sidebar-restore-btn {
  display: block;
}

.brand small,
.eyebrow {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  gap: 8px;
  padding: 6px 12px;
  border-radius: 999px;
  background: var(--accent-2-soft);
  color: var(--accent-2-deep);
  font-size: 0.86rem;
  font-weight: 800;
  letter-spacing: 0.03em;
}

.brand h1 {
  margin: 14px 0 10px;
  font-size: 1.22rem;
  line-height: 1.28;
}

.brand p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

.sidebar nav {
  display: grid;
  gap: 8px;
  margin-top: 22px;
}

.nav-link,
.nav-chapter-link {
  text-decoration: none;
}

.nav-link {
  display: block;
  padding: 11px 12px;
  border-radius: var(--r-md);
  border: 1px solid transparent;
  color: var(--muted);
  transition: 160ms ease;
}

.nav-link strong {
  display: block;
  margin-bottom: 4px;
  color: var(--fg);
}

.nav-link:hover,
.nav-link.active,
.nav-chapter-link:hover,
.nav-chapter-link.active {
  background: color-mix(in oklab, var(--surface-2) 84%, transparent);
  border-color: var(--border);
  color: var(--fg);
}

.nav-group {
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  overflow: hidden;
}

.nav-group-header {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 11px 32px 11px 12px;
  list-style: none;
  cursor: pointer;
  background: color-mix(in oklab, var(--surface-2) 60%, transparent);
  user-select: none;
}

.nav-group-header::-webkit-details-marker {
  display: none;
}

.nav-group-header::after {
  content: "+";
  position: absolute;
  right: 13px;
  top: 50%;
  transform: translateY(-50%);
  color: var(--accent-deep);
  font-size: 1.12rem;
  font-weight: 800;
}

.nav-group[open] > .nav-group-header::after {
  content: "-";
}

.nav-group-badge {
  color: var(--accent-deep);
  font-size: 0.74rem;
  font-weight: 900;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.nav-group-title {
  color: var(--fg);
  font-size: 0.88rem;
  font-weight: 800;
  line-height: 1.35;
}

.nav-group-body {
  display: grid;
  gap: 2px;
  padding: 4px 6px 8px;
}

.nav-chapter-link {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: 10px;
  color: var(--muted);
  font-size: 0.85rem;
  transition: 160ms ease;
}

.nav-chapter-num {
  flex: 0 0 auto;
  padding-top: 1px;
  color: var(--accent-deep);
  font-size: 0.76rem;
  font-weight: 900;
}

.nav-chapter-title {
  line-height: 1.35;
}

.sidebar-tools {
  display: grid;
  gap: 12px;
  margin-top: 24px;
}

.progress-box,
.tool-button {
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  background: color-mix(in oklab, var(--surface) 86%, transparent);
}

.progress-box {
  padding: 14px;
}

.progress-box strong {
  display: block;
  margin-bottom: 4px;
}

.progress-box p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 0.9rem;
}

.progress-track {
  height: 9px;
  overflow: hidden;
  border-radius: 999px;
  background: var(--surface-3);
}

.progress-fill {
  width: 0;
  height: 100%;
  border-radius: inherit;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
}

.tool-button {
  display: block;
  width: 100%;
  padding: 12px 14px;
  color: var(--fg);
  text-align: left;
  text-decoration: none;
}

.tool-button:hover,
.top-theme-toggle:hover,
.top-action-button:hover,
.copy-code-btn:hover,
.prompt-copy-btn:hover,
.quiz-submit-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lift);
}

.main {
  padding-bottom: 42px;
}

.top-actions {
  position: fixed;
  top: 18px;
  right: 24px;
  z-index: 80;
  display: flex;
  align-items: center;
  gap: 10px;
}

.search {
  width: min(34vw, 390px);
  min-height: 42px;
  padding: 0 15px;
  border: 1px solid color-mix(in oklab, var(--border) 84%, transparent);
  border-radius: 999px;
  background: color-mix(in oklab, var(--surface) 82%, transparent);
  color: var(--fg);
  box-shadow: var(--shadow-lift);
  backdrop-filter: blur(16px) saturate(140%);
}

.top-theme-toggle,
.top-action-button {
  min-height: 42px;
  padding: 0 15px;
  border-radius: 999px;
  background: color-mix(in oklab, var(--surface) 82%, transparent);
  color: var(--fg);
  font-weight: 800;
  box-shadow: var(--shadow-lift);
  backdrop-filter: blur(16px) saturate(140%);
}

/* 平台切換按鈕 active 狀態：顯示當前選中的平台 */
.platform-toggle-btn.active {
  background: var(--accent);
  color: oklch(100% 0 0);
  border-color: var(--accent-deep);
}

.content {
  width: min(100%, var(--content-max));
  margin: 0 auto;
  padding: 0 28px;
}

.hero-band {
  width: min(100%, var(--hero-max));
  margin: 0 auto;
  padding: 24px 28px 0;
}

.hero {
  position: relative;
  min-height: 88vh;
  overflow: hidden;
  border-radius: 0 0 36px 36px;
  box-shadow: var(--shadow-lift);
  background:
    linear-gradient(120deg, oklch(20% 0.03 248 / 0.82), oklch(38% 0.06 232 / 0.64)),
    linear-gradient(180deg, transparent, oklch(14% 0.02 248 / 0.42));
}

.hero-media {
  position: absolute;
  inset: 0;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  mix-blend-mode: luminosity;
  opacity: 0.38;
}

.hero-overlay {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.15fr) 380px;
  gap: 28px;
  align-items: end;
  min-height: 88vh;
  padding: 56px;
}

.hero-copy h2 {
  margin: 18px 0;
  color: white;
  font-size: clamp(2.6rem, 5vw, 5.4rem);
  line-height: 0.98;
}

.hero-copy p {
  max-width: 860px;
  margin: 0;
  color: oklch(96% 0.01 250 / 0.92);
  font-size: 1.08rem;
  line-height: 1.9;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.pill {
  padding: 9px 14px;
  border: 1px solid oklch(100% 0 0 / 0.18);
  border-radius: 999px;
  background: oklch(100% 0 0 / 0.12);
  color: white;
  font-size: 0.92rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}

.primary-button,
.secondary-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 50px;
  padding: 0 22px;
  border-radius: 999px;
  font-weight: 800;
  text-decoration: none;
  transition: 160ms ease;
}

.primary-button {
  background: white;
  color: var(--accent-deep);
}

.secondary-button {
  border: 1px solid oklch(100% 0 0 / 0.24);
  color: white;
}

.hero-panel {
  padding: 22px;
  border: 1px solid oklch(100% 0 0 / 0.14);
  border-radius: var(--r-lg);
  background: oklch(100% 0 0 / 0.1);
  color: white;
  backdrop-filter: blur(18px) saturate(140%);
}

.hero-panel h3 {
  margin: 0 0 12px;
  font-size: 1.05rem;
}

.hero-panel ul {
  margin: 0;
  padding-left: 18px;
  line-height: 1.8;
}

.glass-card {
  background: color-mix(in oklab, var(--surface) 84%, transparent);
  border: 1px solid color-mix(in oklab, var(--border) 90%, transparent);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lift);
  backdrop-filter: blur(14px) saturate(140%);
}

.section,
.chapter {
  margin-top: 32px;
  padding: 28px 30px;
}

.section-header h3,
.section-title {
  margin: 0;
  font-size: 1.9rem;
}

.section-header p,
.section > p,
.lead {
  max-width: 900px;
  color: var(--muted);
  line-height: 1.85;
}

.overview-lead {
  padding: 28px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in oklab, var(--surface-2) 88%, transparent);
}

.overview-lead h4 {
  margin: 0 0 12px;
  font-size: 1.35rem;
  line-height: 1.35;
}

.overview-lead p {
  margin: 0;
  color: var(--muted);
  line-height: 1.9;
}

.overview-lead p + p {
  margin-top: 12px;
}

.overview-pills .pill {
  color: var(--fg);
  background: color-mix(in oklab, var(--surface) 82%, transparent);
}

.stat-grid,
.summary-grid,
.brand-grid,
.quiz-container {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 24px;
}

.stat-card,
.summary-card,
.brand-card,
.quiz-card {
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface);
}

.stat-card small,
.summary-card small,
.brand-card small {
  display: block;
  margin-bottom: 8px;
  color: var(--muted-2);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.stat-card strong,
.summary-card strong {
  display: block;
  margin-bottom: 8px;
  font-size: 1.08rem;
}

.data-table {
  width: 100%;
  border-collapse: collapse;
}

.data-table td,
.data-table th {
  padding: 10px 8px;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  text-align: left;
  vertical-align: top;
}

.data-table td:first-child,
.data-table th {
  color: var(--fg);
  font-weight: 800;
}

.day-block {
  margin-top: 42px;
}

.day-header {
  padding: 30px;
}

.day-header-grid {
  display: grid;
  grid-template-columns: 160px minmax(0, 1fr);
  gap: 22px;
  align-items: center;
}

.day-numeral {
  color: var(--accent-2);
  font-size: clamp(5rem, 10vw, 8rem);
  font-weight: 900;
  line-height: 0.85;
  transition: color 340ms ease, text-shadow 340ms ease;
}

.day-header:hover .day-numeral {
  color: var(--accent-2-deep);
  text-shadow: 0 18px 40px color-mix(in oklab, var(--accent-2) 24%, transparent);
}

.day-header h3 {
  margin: 12px 0 8px;
  font-size: 2.1rem;
}

.day-header p {
  margin: 0;
  color: var(--muted);
  line-height: 1.8;
}

.unit {
  display: block;
}

.unit-card {
  margin-top: 20px;
  padding: 28px 30px 32px;
}

.unit.hidden-by-search {
  display: none;
}

.unit-kicker {
  display: inline-block;
  width: fit-content;
  padding: 8px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.92rem;
  font-weight: 800;
}

.unit-title {
  margin: 16px 0 12px;
  font-size: 2rem;
  line-height: 1.15;
}

.unit-summary {
  max-width: 880px;
  margin: 0;
  color: var(--muted);
  font-size: 1.02rem;
  line-height: 1.9;
}

.unit-meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 16px;
}

.unit-meta-chip {
  padding: 6px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in oklab, var(--surface-2) 84%, transparent);
  color: var(--muted);
  font-size: 0.86rem;
}

.goal-list,
.checklist,
.materials,
.concept-list {
  display: grid;
  gap: 10px;
  margin-top: 20px;
}

.goal-item,
.check,
.material-row {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: color-mix(in oklab, var(--surface-2) 90%, transparent);
}

.goal-item::before {
  content: "✓";
  display: inline-flex;
  flex: 0 0 auto;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  margin-top: 1px;
  border-radius: 999px;
  background: var(--success-soft);
  color: var(--success);
  font-weight: 900;
}

.unit-visual-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin: 24px 0 6px;
}

.illustration {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in oklab, var(--surface-2) 88%, transparent);
  box-shadow: var(--shadow-lift);
}

.illustration-hero {
  grid-column: 1 / -1;
}

.illustration img {
  width: 100%;
  aspect-ratio: 16 / 9;
  height: auto;
  object-fit: contain;
}

.illustration-hero img {
  object-fit: cover;
}

/* ===== 功能藍圖區塊（全課各章節產出總覽） ===== */
.feature-roadmap-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 16px;
  margin-top: 8px;
}

.roadmap-card {
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: var(--surface);
  text-decoration: none;
  color: inherit;
  transition: transform 0.18s ease, box-shadow 0.18s ease, border-color 0.18s ease;
}

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

.roadmap-card-head {
  display: flex;
  align-items: center;
  gap: 12px;
}

/* 章節 SVG 圖示外框：漸層底色凸顯每個單元的主題符號 */
.roadmap-glyph {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border-radius: 14px;
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 14%, transparent);
}

.unit-glyph {
  width: 26px;
  height: 26px;
}

.roadmap-kicker {
  display: block;
  font-size: 0.74rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--muted);
}

.roadmap-card-title strong {
  font-size: 1.02rem;
  line-height: 1.35;
}

.roadmap-feature-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.roadmap-feature-list li {
  display: flex;
  align-items: flex-start;
  gap: 8px;
  font-size: 0.9rem;
  color: var(--fg);
}

.feature-check-icon {
  flex-shrink: 0;
  width: 17px;
  height: 17px;
  margin-top: 2px;
  color: var(--success);
}

/* ===== 單元卡片開頭：本章將完成的功能（重點標示） ===== */
.unit-feature-highlight {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin: 4px 0 20px;
  padding: 16px 18px;
  border: 1px solid color-mix(in oklab, var(--accent) 30%, var(--border));
  border-left: 4px solid var(--accent);
  border-radius: var(--r-sm);
  background: color-mix(in oklab, var(--accent) 8%, transparent);
}

.unit-feature-glyph {
  flex-shrink: 0;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 12px;
  color: var(--accent);
  background: color-mix(in oklab, var(--accent) 16%, var(--surface));
}

.unit-feature-body {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.unit-feature-body > strong {
  font-size: 0.86rem;
  letter-spacing: 0.03em;
  color: var(--accent-deep);
}

.feature-chip-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.feature-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 12px;
  border-radius: 999px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--fg);
  background: var(--surface);
  border: 1px solid var(--border);
}

.feature-chip .feature-check-icon {
  margin-top: 0;
}

.caption {
  display: grid;
  gap: 4px;
  margin: 0;
  padding: 12px 16px 14px;
  border-top: 1px solid var(--border);
  color: var(--muted);
  font-size: 0.94rem;
  line-height: 1.7;
}

.caption strong {
  color: var(--fg);
  font-size: 0.82rem;
  letter-spacing: 0.04em;
}

.content-block {
  margin-top: 24px;
}

.content-block h5,
.content-block h4 {
  margin: 0 0 14px;
  font-size: 1.08rem;
}

.accordion {
  display: grid;
  gap: 16px;
  margin-top: 24px;
}

.accordion-item {
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in oklab, var(--surface) 90%, transparent);
}

.accordion-item[open] {
  box-shadow: var(--shadow-lift);
}

.accordion-summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 20px 22px;
  cursor: pointer;
  list-style: none;
  font-size: 1.06rem;
  font-weight: 800;
}

.accordion-summary::-webkit-details-marker {
  display: none;
}

.accordion-summary::after {
  content: "+";
  color: var(--accent-deep);
  font-size: 1.35rem;
  transition: transform 160ms ease;
}

.accordion-item[open] .accordion-summary::after {
  transform: rotate(45deg);
}

.accordion-body {
  padding: 0 22px 22px;
}

/* AI CRM 情境區塊的視覺差異化 */
.accordion-item + .accordion-item {
  margin-top: 8px;
}
.accordion .accordion-item:last-child:not(:first-child) .accordion-summary {
  color: var(--accent-deep);
  background: linear-gradient(135deg,
    color-mix(in oklab, var(--accent) 6%, transparent),
    color-mix(in oklab, var(--accent-deep) 4%, transparent));
  border-left: 3px solid var(--accent);
}

.concept {
  padding: 18px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: color-mix(in oklab, var(--surface-2) 80%, transparent);
  min-width: 0; /* 防止 grid 項目被內部 pre 等長內容撐開，造成水平溢出與圖片遮擋 */
}

/* 群組內多個概念段落的間距與分隔線 */
.concept-list .concept + .concept {
  margin-top: 16px;
  padding-top: 20px;
  border-top: 2px solid color-mix(in oklab, var(--accent) 18%, var(--border));
}

.concept-heading {
  margin: 0 0 8px;
}

.concept-body,
.concept p {
  margin: 0;
  color: var(--muted);
  line-height: 1.9;
}

.concept-body + .kv,
.concept .data-table,
.note {
  margin-top: 14px;
}

.kv {
  display: grid;
  gap: 8px;
}

.kv-row {
  display: grid;
  grid-template-columns: 180px minmax(0, 1fr);
  gap: 12px;
  padding: 10px 0;
  border-bottom: 1px solid var(--border);
}

.kv-key {
  color: var(--fg);
  font-weight: 800;
}

.kv-value {
  color: var(--muted);
}

.note,
.callout {
  padding: 16px 18px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: color-mix(in oklab, var(--surface-2) 84%, transparent);
  color: var(--muted);
  line-height: 1.85;
}

.note strong,
.callout strong {
  display: block;
  margin-bottom: 8px;
  color: var(--fg);
}

.prompt-box,
.code-block {
  overflow: hidden;
  border: 1px solid color-mix(in oklab, white 12%, transparent);
  border-radius: var(--r-lg);
  background: var(--code-bg);
  color: var(--code-fg);
}

.prompt-box {
  border-left: 3px solid var(--accent-2);
  position: relative;
}

.prompt-head,
.code-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 12px 16px;
  border-bottom: 1px solid color-mix(in oklab, white 12%, transparent);
  color: oklch(88% 0.01 250);
}

.prompt-head strong {
  display: block;
  color: white;
}

.prompt-head strong::before {
  content: "PROMPT";
  display: inline-block;
  margin-right: 8px;
  padding: 1px 7px;
  border-radius: 4px;
  background: var(--accent-2);
  color: white;
  font-size: 10px;
  letter-spacing: 0.06em;
  vertical-align: middle;
}

/* 驗證提示詞徽章：綠色，標示「驗證」 */
.prompt-box.is-verify {
  border-left-color: oklch(72% 0.17 150);
}
.prompt-box.is-verify .prompt-head strong::before {
  content: "驗證";
  /* 背景降低亮度以確保白字對比（深淺色模式皆可讀） */
  background: oklch(56% 0.15 150);
}
/* 排錯提示詞徽章：琥珀色，標示「排錯」 */
.prompt-box.is-fix {
  border-left-color: oklch(75% 0.15 70);
}
.prompt-box.is-fix .prompt-head strong::before {
  content: "排錯";
  /* 背景降低亮度以確保白字對比（深淺色模式皆可讀） */
  background: oklch(58% 0.14 65);
}

.prompt-head span {
  display: block;
  margin-top: 4px;
  color: oklch(78% 0.01 250);
  font-size: 0.9rem;
}

.prompt-copy-btn,
.copy-code-btn {
  flex: 0 0 auto;
  padding: 6px 11px;
  border-color: color-mix(in oklab, white 24%, transparent);
  border-radius: 8px;
  background: color-mix(in oklab, white 6%, transparent);
  color: oklch(88% 0.01 250);
  font-size: 0.82rem;
  font-weight: 800;
}

.prompt-copy-btn.ok,
.copy-code-btn.ok {
  border-color: color-mix(in oklab, var(--success) 60%, transparent);
  color: var(--success);
}

.prompt-box pre,
.code-block pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
  color: var(--code-fg);
  font-size: 0.94rem;
  line-height: 1.75;
  white-space: pre-wrap;
  word-break: break-word;
}

.prompt-box pre code,
.code-block pre code {
  padding: 0;
  border-radius: 0;
  background: transparent;
}

.task-panel {
  margin-top: 24px;
  padding: 22px;
  border: 1px solid var(--border);
  border-radius: var(--r-lg);
  background: color-mix(in oklab, var(--surface-2) 88%, transparent);
}

.task-panel h4 {
  margin: 0 0 14px;
  font-size: 1.08rem;
}

.check {
  align-items: center;
  cursor: pointer;
}

.check.done {
  border-color: color-mix(in oklab, var(--success) 35%, var(--border));
  background: var(--success-soft);
}

.check input {
  position: absolute;
  opacity: 0;
  width: 0;
  height: 0;
  pointer-events: none;
}

.check::before {
  content: "";
  flex: 0 0 auto;
  width: 20px;
  height: 20px;
  margin-top: 1px;
  border: 2px solid var(--border-strong);
  border-radius: var(--r-sm);
  display: grid;
  place-items: center;
  transition: all 160ms ease;
}

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

.check.done::before {
  content: "✓";
  background: var(--success);
  border-color: var(--success);
  color: white;
  font-size: 12px;
  font-weight: 900;
}

.check.done span {
  color: var(--muted);
  text-decoration: line-through;
}

.material-tag {
  flex: 0 0 auto;
  padding: 4px 9px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent-deep);
  font-size: 0.78rem;
  font-weight: 900;
}

.material-name {
  color: var(--fg);
  font-weight: 800;
  text-decoration: none;
}

.material-desc {
  margin-top: 4px;
  color: var(--muted);
  font-size: 0.92rem;
}

.quiz-question {
  margin-bottom: 15px;
  font-weight: 900;
}

.quiz-options {
  display: grid;
  gap: 10px;
}

.quiz-option {
  display: flex;
  gap: 10px;
  align-items: center;
  padding: 12px;
  border: 1px solid var(--border);
  border-radius: var(--r-sm);
  cursor: pointer;
}

.quiz-option:hover {
  background: var(--surface-2);
}

.quiz-submit-btn {
  margin-top: 20px;
  padding: 12px 22px;
  border-radius: 999px;
  background: var(--accent);
  color: white;
  font-weight: 900;
}

.site-footer {
  margin-top: 34px;
  padding: 0 24px;
  color: var(--muted);
  text-align: center;
  line-height: 1.8;
}

@media (max-width: 1180px) {
  .shell {
    margin-left: 0;
  }

  .sidebar {
    display: none;
  }

  body.sidebar-visible-mobile .sidebar {
    display: block;
  }

  .sidebar-restore-btn {
    display: block;
  }

  .top-actions {
    padding-left: 78px;
  }
}

@media (max-width: 980px) {
  .hero-overlay,
  .stat-grid,
  .summary-grid,
  .brand-grid,
  .quiz-container,
  .day-header-grid,
  .unit-visual-grid {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  .hero-overlay {
    min-height: auto;
    padding: 34px 24px 28px;
  }

  .top-actions {
    position: sticky;
    top: 0;
    right: auto;
    justify-content: flex-end;
    padding: 12px 16px 12px 86px;
    background: color-mix(in oklab, var(--bg) 86%, transparent);
    backdrop-filter: blur(16px);
  }

  .search {
    width: min(100%, 360px);
  }
}

@media (max-width: 640px) {
  .content,
  .hero-band {
    padding-right: 16px;
    padding-left: 16px;
  }

  .hero-copy h2 {
    font-size: clamp(2.2rem, 16vw, 3.4rem);
  }

  .section,
  .chapter,
  .unit-card,
  .day-header {
    padding: 22px 18px;
    border-radius: 22px;
  }

  .day-header-grid {
    gap: 8px;
  }

  .day-numeral {
    font-size: 4.2rem;
  }

  .unit-title {
    font-size: 1.55rem;
  }

  .top-actions {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }

  .search {
    grid-column: 1 / -1;
    width: 100%;
  }

  .top-theme-toggle,
  .top-action-button {
    padding: 0 10px;
    font-size: 0.86rem;
  }

  .kv-row {
    grid-template-columns: 1fr;
    gap: 4px;
  }

  .prompt-head,
  .code-head {
    align-items: flex-start;
    flex-direction: column;
  }
}

/* SharedCase 左右排版優化 */
.brand-card-split {
  grid-column: 1 / -1; /* 讓它橫跨整行 */
  display: grid;
  grid-template-columns: 1.2fr 1fr; /* 左右比例為 1.2 比 1 */
  gap: 28px;
  align-items: start;
}

.brand-card-media {
  overflow: hidden;
  border-radius: var(--r-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-lift);
}

.brand-card-media img {
  width: 100%;
  height: 100%;
  max-height: 480px;
  object-fit: cover;
  display: block;
}

/* RWD 支援 */
@media (max-width: 980px) {
  .brand-card-split {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}

/* --- 教材素材預覽 Modal 樣式 --- */
.modal-overlay {
  position: fixed;
  inset: 0;
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
  background: color-mix(in oklab, var(--bg) 60%, transparent);
  backdrop-filter: blur(8px);
}

.modal-card {
  display: flex;
  flex-direction: column;
  width: min(90vw, 900px);
  max-height: 85vh;
  background: var(--surface);
  border: 1px solid var(--border-strong);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-lift);
  overflow: hidden;
  animation: modalFadeIn 240ms cubic-bezier(0.16, 1, 0.3, 1);
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: translateY(12px) scale(0.98);
  }
  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 18px 28px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
}

.modal-header h3 {
  margin: 0;
  font-size: 1.25rem;
  font-weight: 900;
  color: var(--accent-deep);
}

.modal-close {
  border: none;
  background: transparent;
  color: var(--muted);
  font-size: 1.8rem;
  cursor: pointer;
  line-height: 1;
  padding: 0;
  transition: 150ms ease;
}

.modal-close:hover {
  color: var(--fg);
}

.modal-body {
  flex: 1 1 auto;
  padding: 28px;
  overflow-y: auto;
  line-height: 1.8;
  color: var(--fg);
}

.modal-loading,
.modal-error {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 200px;
  color: var(--muted);
  font-weight: 700;
}

.modal-error {
  color: var(--danger);
}

.modal-actions {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 12px;
  padding: 16px 28px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
}

.modal-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 38px;
  padding: 0 16px;
  border-radius: 999px;
  font-weight: 800;
  font-size: 0.9rem;
  text-decoration: none;
  border: 1px solid var(--border);
  background: var(--surface);
  color: var(--fg);
  cursor: pointer;
  transition: 160ms ease;
}

.modal-btn:hover {
  background: var(--surface-3);
  transform: translateY(-1px);
}

.modal-btn.download-btn {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.modal-btn.download-btn:hover {
  background: var(--accent-deep);
}

.modal-btn.print-btn {
  background: var(--accent-2-soft);
  color: var(--accent-2-deep);
  border-color: var(--accent-2);
}

.modal-btn.print-btn:hover {
  background: var(--accent-2-deep);
  color: white;
}

/* Markdown 預覽排版樣式 */
.markdown-body h1,
.markdown-body h2,
.markdown-body h3 {
  color: var(--fg);
  font-weight: 900;
  margin-top: 24px;
  margin-bottom: 12px;
}

.markdown-body h1 {
  font-size: 1.75rem;
  border-bottom: 2px solid var(--border);
  padding-bottom: 8px;
  margin-top: 0;
}

.markdown-body h2 {
  font-size: 1.4rem;
  border-bottom: 1px solid var(--border);
  padding-bottom: 6px;
}

.markdown-body h3 {
  font-size: 1.15rem;
}

.markdown-body p {
  margin-top: 0;
  margin-bottom: 16px;
}

.markdown-body ul,
.markdown-body ol {
  margin-top: 0;
  margin-bottom: 16px;
  padding-left: 24px;
}

.markdown-body li {
  margin-bottom: 6px;
}

.markdown-body pre {
  margin: 16px 0;
  padding: 16px;
  background: var(--code-bg);
  color: var(--code-fg);
  border-radius: var(--r-sm);
  overflow-x: auto;
}

.markdown-body code {
  font-family: Consolas, Monaco, "Andale Mono", monospace;
  font-size: 0.9rem;
}

.markdown-body pre code {
  padding: 0;
  background: transparent;
  border-radius: 0;
}

/* --- 列印與匯出 PDF 樣式支援 --- */
@media print {
  body {
    background: white !important;
    color: black !important;
  }
  
  /* 隱藏主畫面的所有元素 */
  #sidebar-restore,
  .top-actions,
  .shell,
  .site-footer {
    display: none !important;
  }

  /* 調整 Modal 覆蓋層為普通區塊，避免固定定位造成的分頁截斷 */
  .modal-overlay {
    position: absolute !important;
    inset: 0 !important;
    z-index: auto !important;
    display: block !important;
    padding: 0 !important;
    background: transparent !important;
    backdrop-filter: none !important;
  }

  .modal-card {
    border: none !important;
    box-shadow: none !important;
    max-width: 100% !important;
    width: 100% !important;
    max-height: none !important;
    height: auto !important;
    overflow: visible !important;
    background: white !important;
    animation: none !important;
  }

  .modal-header,
  .modal-actions {
    display: none !important;
  }

  .modal-body {
    overflow: visible !important;
    max-height: none !important;
    padding: 0 !important;
  }

  /* 強制列印背景顏色，保留程式碼區塊等效果 */
  * {
    -webkit-print-color-adjust: exact !important;
    print-color-adjust: exact !important;
  }

  /* 分頁優化 */
  .markdown-body pre,
  .markdown-body blockquote,
  .markdown-body tr,
  .markdown-body li {
    page-break-inside: avoid;
    break-inside: avoid;
  }

  .markdown-body h1,
  .markdown-body h2,
  .markdown-body h3 {
    page-break-after: avoid;
    break-after: avoid;
  }
}

/* ===== 提示詞平台切換控制列 (直接放在所有提示詞上方) ===== */
.prompt-platform-bar {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  padding: 12px 16px;
  border-radius: var(--r-md);
  background: color-mix(in oklab, var(--surface-2) 60%, transparent);
  border: 1px solid var(--border);
}

.prompt-platform-label {
  font-size: 0.9rem;
  font-weight: 800;
  color: var(--muted);
}

.prompt-platform-btn {
  padding: 6px 14px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in oklab, var(--surface) 82%, transparent);
  color: var(--fg);
  font-size: 0.85rem;
  font-weight: 800;
  cursor: pointer;
  transition: 160ms ease;
}

.prompt-platform-btn:hover {
  transform: translateY(-1px);
  box-shadow: var(--shadow-lift);
}

.prompt-platform-btn.active {
  background: var(--accent);
  color: oklch(100% 0 0);
  border-color: var(--accent-deep);
}

/* ===== 核心觀念 Tabs & 圓點步進器樣式 ===== */
.concept-tabs-nav-wrapper {
  display: flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--border);
  padding-bottom: 8px;
}

.concept-tabs {
  flex: 1;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.concept-tabs-nav-arrow {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  border: 1px solid var(--border);
  border-radius: 50%;
  background: color-mix(in oklab, var(--surface-2) 64%, transparent);
  color: var(--muted);
  font-size: 0.85rem;
  font-weight: 800;
  cursor: pointer;
  transition: all 160ms cubic-bezier(0.4, 0, 0.2, 1);
  user-select: none;
}

.concept-tabs-nav-arrow:hover:not(:disabled) {
  background: var(--accent);
  color: white;
  border-color: var(--accent-deep);
  transform: scale(1.05);
  box-shadow: var(--shadow-lift);
}

.concept-tabs-nav-arrow:disabled {
  opacity: 0.25;
  cursor: not-allowed;
}

/* 橫向滾動條美化 */
.concept-tabs::-webkit-scrollbar {
  height: 4px;
}
.concept-tabs::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 4px;
}

.concept-tab-btn {
  padding: 8px 16px;
  border: 1px solid var(--border);
  border-radius: 999px;
  background: color-mix(in oklab, var(--surface-2) 64%, transparent);
  color: var(--muted);
  font-size: 0.86rem;
  font-weight: 800;
  cursor: pointer;
  white-space: nowrap;
  transition: all 160ms cubic-bezier(0.4, 0, 0.2, 1);
}

.concept-tab-btn:hover {
  border-color: var(--accent-soft);
  color: var(--fg);
}

.concept-tab-btn.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent-deep);
  box-shadow: var(--shadow-lift);
}

.concept-nav-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-top: 20px;
  padding-top: 16px;
  border-top: 1px solid var(--border);
}

.concept-nav-btn {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 14px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--fg);
  font-size: 0.85rem;
  font-weight: 800;
  cursor: pointer;
  transition: all 150ms ease;
}

.concept-nav-btn:hover:not(:disabled) {
  background: var(--surface-2);
  transform: translateY(-1px);
  box-shadow: var(--shadow-lift);
}

.concept-nav-btn:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.concept-dots {
  display: flex;
  align-items: center;
  gap: 6px;
}

.concept-dot {
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: var(--border-strong);
  cursor: pointer;
  transition: width 0.24s cubic-bezier(0.4, 0, 0.2, 1), background-color 0.24s;
}

.concept-dot:hover {
  background: var(--muted);
}

.concept-dot.active {
  width: 20px;
  background: var(--accent);
}

/* ===== 核心觀念 SVG 圖解佈局與微動畫 ===== */
.concept-layout {
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: stretch;
}

.concept-text-col {
  width: 100%;
  display: flex;
  flex-direction: column;
}

.concept-visual-col {
  width: 100%;
  max-width: 100%;
  min-width: 0; /* 防止 flex 容器被大圖撐開 */
  flex-shrink: 1; /* 允許 flex 項目收縮 */
  margin: 0 auto 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 240px;
  border: 1px solid var(--border);
  border-radius: var(--r-md);
  background: color-mix(in oklab, var(--surface-2) 35%, transparent);
  padding: 16px;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  overflow: hidden;
}

.concept-visual-col:hover {
  transform: translateY(-2px);
  border-color: var(--accent-soft);
  box-shadow: var(--shadow-lift);
  background: color-mix(in oklab, var(--surface-2) 60%, transparent);
}

/* 概念圖片樣式：保持原始比例、寬度撐滿、高度等比例自動計算，防止變形或裁切 */
.concept-svg-illustration {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
}

/* 1. Spring MVC 請求流動動畫 */
.svg-flow-arrow {
  stroke-dasharray: 8;
  animation: flowdash 30s linear infinite;
}
@keyframes flowdash {
  to {
    stroke-dashoffset: -1000;
  }
}
.svg-flow-node {
  transition: transform 0.3s ease;
}
.svg-flow-node:hover {
  transform: scale(1.05);
}

/* 2. Flyway 資料庫遷移動畫 */
.svg-flyway-v {
  transition: transform 0.3s cubic-bezier(0.175, 0.885, 0.32, 1.275);
}
.svg-flyway-step:hover .svg-flyway-v {
  transform: translateY(-5px);
}

/* 3. Spring Security 閥門旋轉動畫 */
.svg-valve-gate {
  transition: transform 0.4s ease;
  transform-origin: center;
}
.svg-filter-item:hover .svg-valve-gate {
  transform: rotate(90deg);
}

/* 4. SSE 串流氣泡漂移動畫 */
.svg-sse-bubble {
  animation: ssefloat 3s infinite linear;
}
.svg-sse-bubble-2 {
  animation: ssefloat 4s infinite linear 1.5s;
}
.svg-sse-bubble-3 {
  animation: ssefloat 2.5s infinite linear 0.8s;
}
@keyframes ssefloat {
  0% {
    transform: translateX(0);
    opacity: 0;
  }
  15% {
    opacity: 1;
  }
  85% {
    opacity: 1;
  }
  100% {
    transform: translateX(80px);
    opacity: 0;
  }
}

/* 5. Embabel GOAP Agent 決策線索動畫 */
.svg-agent-brain {
  animation: brainpulse 2s infinite ease-in-out;
  transform-origin: center;
}
@keyframes brainpulse {
  0%, 100% { transform: scale(1); opacity: 0.9; }
  50% { transform: scale(1.05); opacity: 1; filter: drop-shadow(0 0 6px var(--accent)); }
}

/* 響應式適配：調整窄螢幕時圖表與下方文字的間距 */
@media (max-width: 768px) {
  .concept-visual-col {
    margin-bottom: 8px;
  }
}