:root {
  --bg: #ffffff;
  --bg-soft: #f5f7fb;
  --text: #111827;
  --muted: #6b7280;
  --line: #e5e7eb;
  --blue-soft: #dbeafe;
  --blue: #60a5fa;
  --purple-soft: #ede9fe;
  --purple: #a78bfa;
  --surface: rgba(255, 255, 255, 0.82);
  --shadow: 0 18px 48px rgba(17, 24, 39, 0.08);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--text);
  background: var(--bg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
}

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

button,
input {
  font: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  align-items: center;
  justify-content: space-between;
  min-height: 64px;
  padding: 0 36px;
  border-bottom: 1px solid rgba(229, 231, 235, 0.72);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(18px);
}

.brand {
  font-size: 15px;
  font-weight: 700;
}

.site-nav {
  display: flex;
  gap: 26px;
  color: var(--muted);
  font-size: 14px;
}

.site-nav a:hover {
  color: var(--text);
}

.nav-toggle {
  display: none;
  width: 38px;
  height: 38px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.nav-toggle span {
  display: block;
  width: 16px;
  height: 2px;
  margin: 5px auto;
  background: var(--text);
}

.hero {
  min-height: calc(100vh - 64px);
  display: grid;
  align-content: center;
  justify-items: center;
  padding: 86px 24px 120px;
  text-align: center;
  background:
    radial-gradient(circle at 50% 18%, rgba(219, 234, 254, 0.9), transparent 34%),
    linear-gradient(180deg, #fff 0%, #f8fbff 100%);
}

.eyebrow {
  margin: 0 0 14px;
  color: #5b6fb7;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0;
  text-transform: uppercase;
}

h1,
h2,
h3,
p {
  overflow-wrap: anywhere;
}

.hero h1 {
  max-width: 920px;
  margin: 0;
  font-size: clamp(56px, 10vw, 104px);
  line-height: 0.98;
  letter-spacing: 0;
}

.hero-copy {
  max-width: 720px;
  margin: 28px auto 0;
  color: var(--muted);
  font-size: 22px;
  line-height: 1.5;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 14px;
  margin-top: 34px;
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 44px;
  padding: 0 22px;
  border-radius: 8px;
  font-weight: 700;
}

.button.primary {
  color: #fff;
  background: #2563eb;
}

.button.secondary {
  color: #364153;
  border: 1px solid var(--line);
  background: #fff;
}

.section {
  padding: 96px 36px;
}

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

.section-heading {
  max-width: 1120px;
  margin: 0 auto 34px;
}

.section-heading.split {
  display: flex;
  align-items: end;
  justify-content: space-between;
  gap: 24px;
}

.section-heading h2,
.page-hero h1 {
  max-width: 760px;
  margin: 0;
  font-size: clamp(34px, 5vw, 64px);
  line-height: 1.08;
}

.text-link {
  color: #2563eb;
  font-weight: 700;
  white-space: nowrap;
}

.feature-grid,
.phase-grid,
.project-grid,
.chapter-list,
.prompt-list,
.example-grid {
  max-width: 1120px;
  margin: 0 auto;
  display: grid;
  gap: 18px;
}

.feature-grid,
.phase-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

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

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

.feature-card,
.phase-card,
.project-card,
.chapter-card,
.prompt-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: var(--surface);
}

a.chapter-card {
  transition: transform 180ms ease, box-shadow 180ms ease;
}

a.chapter-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.feature-card,
.phase-card,
.chapter-card,
.prompt-card {
  padding: 24px;
}

.feature-card {
  min-height: 230px;
}

.feature-number {
  display: inline-block;
  margin-bottom: 28px;
  color: #7c86a8;
  font-weight: 800;
}

.feature-card h3,
.phase-card h3,
.project-card h3,
.project-card h2,
.chapter-card h2 {
  margin: 0 0 10px;
  font-size: 21px;
  line-height: 1.25;
}

.feature-card p,
.phase-card span,
.project-card p,
.chapter-card p,
.prompt-card p,
.page-hero p {
  margin: 0;
  color: var(--muted);
}

.phase-card p {
  margin: 0 0 8px;
  color: #64748b;
  font-size: 13px;
  font-weight: 800;
}

.project-card {
  overflow: hidden;
  background: #fff;
  box-shadow: var(--shadow);
}

.project-card h2,
.project-card h3,
.project-card p,
.project-card span {
  display: block;
  margin-left: 22px;
  margin-right: 22px;
}

.project-card h2,
.project-card h3 {
  margin-top: 20px;
}

.project-card p {
  margin-bottom: 14px;
}

.project-card span {
  margin-bottom: 22px;
  color: #5b6fb7;
  font-size: 13px;
  font-weight: 800;
}

.project-preview {
  height: 172px;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(135deg, var(--blue-soft), var(--purple-soft));
  position: relative;
}

.project-preview::before,
.project-preview::after {
  content: "";
  position: absolute;
  border-radius: 8px;
  background: rgba(255, 255, 255, 0.86);
}

.project-preview::before {
  width: 58%;
  height: 38%;
  left: 24px;
  top: 26px;
}

.project-preview::after {
  width: 42%;
  height: 18%;
  right: 24px;
  bottom: 26px;
}

.project-preview.todo::before {
  width: calc(100% - 48px);
  height: 16px;
  box-shadow: 0 28px 0 rgba(255,255,255,0.86), 0 56px 0 rgba(255,255,255,0.86);
}

.project-preview.calculator::before {
  width: 70%;
  height: 30px;
}

.project-preview.calculator::after {
  width: 70%;
  height: 70px;
  left: 24px;
  bottom: 24px;
}

.project-preview.gallery::before {
  width: 34%;
  height: 34%;
  box-shadow: 86px 0 0 rgba(255,255,255,0.86), 0 62px 0 rgba(255,255,255,0.86), 86px 62px 0 rgba(255,255,255,0.86);
}

.project-preview.portfolio::before {
  width: 48%;
  height: 78%;
}

.project-preview.portfolio::after {
  height: 78%;
}

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

.example-grid {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.example-card {
  min-height: 210px;
  padding: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.example-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow);
}

.example-card span {
  display: inline-block;
  margin-bottom: 26px;
  color: #5b6fb7;
  font-size: 13px;
  font-weight: 900;
}

.example-card h2 {
  margin: 0 0 10px;
  font-size: 21px;
  line-height: 1.25;
}

.example-card p {
  margin: 0;
  color: var(--muted);
}

.prompt-card {
  display: grid;
  gap: 20px;
  align-content: space-between;
  min-height: 184px;
}

.copy-button,
.filter-button,
.back-to-top {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  color: var(--text);
  cursor: pointer;
}

.copy-button {
  justify-self: start;
  padding: 9px 14px;
  color: #2563eb;
  font-weight: 800;
}

.timeline {
  max-width: 860px;
  margin: 0 auto;
  display: grid;
  gap: 12px;
}

.timeline label {
  display: flex;
  gap: 12px;
  align-items: center;
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.page-hero {
  padding: 104px 36px 72px;
  text-align: center;
  background: linear-gradient(180deg, #fff 0%, #f8fbff 100%);
}

.page-hero h1,
.page-hero p {
  margin-left: auto;
  margin-right: auto;
}

.page-hero p {
  max-width: 680px;
  margin-top: 18px;
  font-size: 20px;
}

.filter-bar {
  max-width: 1120px;
  margin: 0 auto 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.filter-button {
  padding: 9px 15px;
  color: var(--muted);
  font-weight: 800;
}

.filter-button.active {
  color: #fff;
  border-color: #2563eb;
  background: #2563eb;
}

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

.chapter-card span {
  display: inline-block;
  margin-bottom: 22px;
  color: #7c86a8;
  font-weight: 900;
}

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

.faq-list {
  max-width: 820px;
  margin: 0 auto;
  border-top: 1px solid var(--line);
}

.faq-question {
  width: 100%;
  min-height: 64px;
  padding: 18px 4px;
  border: 0;
  border-bottom: 1px solid var(--line);
  background: transparent;
  color: var(--text);
  text-align: left;
  font-weight: 800;
  cursor: pointer;
}

.faq-answer {
  display: none;
  padding: 0 0 18px;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.faq-answer.open {
  display: block;
}

.back-to-top {
  position: fixed;
  right: 22px;
  bottom: 22px;
  width: 44px;
  height: 44px;
  opacity: 0;
  pointer-events: none;
  transition: opacity 180ms ease;
}

.back-to-top.visible {
  opacity: 1;
  pointer-events: auto;
}

.site-footer {
  display: flex;
  justify-content: space-between;
  gap: 24px;
  padding: 34px 36px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 14px;
}

.site-footer p {
  margin: 0;
}

.book-page {
  padding: 72px 24px 96px;
  background: linear-gradient(180deg, #fff 0%, #f8fbff 100%);
}

.book-content {
  max-width: 820px;
  margin: 0 auto;
  padding: 54px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  box-shadow: var(--shadow);
}

.book-content h1 {
  margin: 0;
  font-size: clamp(38px, 6vw, 64px);
  line-height: 1.08;
}

.book-content .lead {
  margin: 22px 0 36px;
  color: var(--muted);
  font-size: 21px;
}

.book-content h2 {
  margin: 38px 0 12px;
  font-size: 26px;
}

.book-content p,
.book-content li {
  color: #374151;
  font-size: 17px;
}

.book-content pre {
  overflow-x: auto;
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #f8fafc;
}

.book-content code {
  font-family: "SFMono-Regular", Consolas, monospace;
}

.book-content table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
}

.book-content th,
.book-content td {
  padding: 12px 16px;
  border: 1px solid var(--line);
  text-align: left;
}

.book-content th {
  background: var(--bg-soft);
  font-weight: 700;
  color: var(--text);
}

.book-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 46px;
}

.progress-shell {
  max-width: 980px;
  margin: 0 auto;
}

.progress-summary {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 16px;
  margin-bottom: 18px;
}

.progress-summary article,
.chapter-progress-card {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.progress-summary article {
  padding: 22px;
}

.progress-summary span {
  display: block;
  font-size: 40px;
  font-weight: 900;
}

.progress-summary p {
  margin: 4px 0 0;
  color: var(--muted);
}

.progress-track.wide {
  height: 14px;
  overflow: hidden;
  border-radius: 8px;
  background: var(--line);
}

.progress-actions {
  margin: 18px 0;
}

.chapter-progress-list {
  display: grid;
  gap: 12px;
}

.chapter-progress-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  align-items: start;
  padding: 18px;
}

.chapter-progress-card input {
  width: 20px;
  height: 20px;
  margin-top: 6px;
}

.chapter-progress-card h2 {
  margin: 0 0 4px;
  font-size: 20px;
}

.chapter-progress-card p {
  margin: 0 0 10px;
  color: var(--muted);
  font-size: 14px;
  font-weight: 800;
}

.chapter-progress-card.done h2 {
  color: var(--muted);
  text-decoration: line-through;
}

.progress-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.progress-links a {
  color: #2563eb;
  font-weight: 800;
}

.manuscript-list {
  max-width: 980px;
  margin: 0 auto;
  display: grid;
  gap: 10px;
}

.manuscript-row {
  display: grid;
  grid-template-columns: 56px 1fr auto auto;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.manuscript-row span {
  color: #5b6fb7;
  font-weight: 900;
}

.manuscript-row h2 {
  margin: 0;
  font-size: 18px;
}

.manuscript-row a {
  color: #2563eb;
  font-weight: 800;
}

.search-shell {
  max-width: 980px;
  margin: 0 auto;
}

.search-box {
  display: grid;
  gap: 8px;
  color: #374151;
  font-weight: 900;
}

.search-box input {
  width: 100%;
  padding: 15px 16px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font: inherit;
  background: #fff;
}

.search-count {
  margin: 16px 0;
  color: var(--muted);
  font-weight: 800;
}

.search-results {
  display: grid;
  gap: 12px;
}

.search-result-card {
  display: block;
  padding: 20px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.search-result-card span {
  color: #5b6fb7;
  font-size: 13px;
  font-weight: 900;
}

.search-result-card h2 {
  margin: 8px 0;
  font-size: 22px;
}

.search-result-card p {
  margin: 0;
  color: var(--muted);
}

@media (max-width: 900px) {
  .site-header {
    padding: 0 18px;
  }

  .nav-toggle {
    display: block;
  }

  .site-nav {
    position: absolute;
    top: 64px;
    left: 0;
    right: 0;
    display: none;
    flex-direction: column;
    gap: 0;
    padding: 10px 18px 18px;
    border-bottom: 1px solid var(--line);
    background: rgba(255, 255, 255, 0.96);
  }

  .site-nav.open {
    display: flex;
  }

  .site-nav a {
    padding: 12px 0;
  }

  .hero {
    min-height: auto;
    padding: 74px 20px 88px;
  }

  .hero h1 {
    font-size: clamp(48px, 16vw, 72px);
  }

  .hero-copy,
  .page-hero p {
    font-size: 18px;
  }

  .section {
    padding: 72px 20px;
  }

  .section-heading.split {
    align-items: start;
    flex-direction: column;
  }

  .feature-grid,
  .phase-grid,
  .project-grid,
  .project-grid.compact,
  .chapter-list,
  .prompt-list,
  .example-grid {
    grid-template-columns: 1fr;
  }

  .site-footer {
    flex-direction: column;
    padding: 28px 20px;
  }

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

  .manuscript-row {
    grid-template-columns: 1fr;
    align-items: start;
  }

  .book-content {
    padding: 30px 20px;
  }

  .book-nav {
    flex-direction: column;
  }
}

/* Purchase CTA & Locked Content Styles */
.purchase-cta {
  margin: 48px 0;
  padding: 32px;
  border: 1px solid #dbeafe;
  border-radius: 12px;
  background: #f0f7ff;
  text-align: center;
}

.purchase-cta h3 {
  margin: 0 0 12px;
  color: #1e40af;
}

.purchase-cta p {
  margin: 0 0 24px;
  color: #3b82f6;
  font-size: 16px;
}

.locked-content {
  position: relative;
  overflow: hidden;
  margin-bottom: 24px;
  padding: 24px;
  border: 1px dashed var(--line);
  border-radius: 8px;
  background: #f9fafb;
}

.locked-content::after {
  content: "內容已鎖定";
  display: flex;
  align-items: center;
  justify-content: center;
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(249, 250, 251, 0.86);
  backdrop-filter: blur(4px);
  color: var(--muted);
  font-weight: 700;
  font-size: 14px;
}

.locked-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: 12px;
  padding: 4px 12px;
  border-radius: 20px;
  background: #fee2e2;
  color: #b91c1c;
  font-size: 12px;
  font-weight: 700;
}