/* ========================================
   gusangciren.github.io — Global Styles v2
   Added: dark mode, lightbox, back-to-top,
          hamburger menu, reading time, TOC
   ======================================== */

:root {
  --color-bg: #fafaf9;
  --color-text: #1c1917;
  --color-text-secondary: #78716c;
  --color-accent: #F55000;
  --color-border: #e7e5e4;
  --color-card-bg: #ffffff;
  --color-overlay: rgba(0,0,0,0.45);
  --color-accent-light: rgba(245,80,0,0.08);
  --max-width: 720px;
  --font-serif: 'Noto Serif SC', 'Source Han Serif SC', serif;
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
}

/* 暗黑模式 */
[data-theme="dark"] {
  --color-bg: #18181b;
  --color-text: #e4e4e7;
  --color-text-secondary: #a1a1aa;
  --color-accent: #ff7a33;
  --color-border: #27272a;
  --color-card-bg: #1f1f23;
  --color-overlay: rgba(0,0,0,0.7);
  --color-accent-light: rgba(255,122,51,0.1);
}

/* 过渡动画（仅在主题切换时生效） */
body {
  transition: background-color 0.3s ease, color 0.3s ease;
}

/* 自动跟随系统偏好 */
@media (prefers-color-scheme: dark) {
  [data-theme="auto"] {
    --color-bg: #18181b;
    --color-text: #e4e4e7;
    --color-text-secondary: #a1a1aa;
    --color-accent: #ff7a33;
    --color-border: #27272a;
    --color-card-bg: #1f1f23;
    --color-overlay: rgba(0,0,0,0.7);
    --color-accent-light: rgba(255,122,51,0.1);
  }
}

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

body {
  font-family: var(--font-sans);
  background: var(--color-bg);
  color: var(--color-text);
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
  transition: background 0.3s, color 0.3s;
}

/* 锚点偏移：避免被固定导航栏盖住 */
h2[id], h3[id] {
  scroll-margin-top: 72px;
}

/* ========== Navbar ========== */
.navbar {
  position: sticky;
  top: 0;
  background: rgba(250, 250, 249, 0.92);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--color-border);
  z-index: 100;
}
[data-theme="dark"] .navbar {
  background: rgba(24, 24, 27, 0.92);
}
.nav-inner {
  max-width: 960px;
  margin: 0 auto;
  padding: 0 24px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.logo {
  display: flex;
  align-items: center;
  gap: 12px;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--color-text);
  text-decoration: none;
  padding: 4px 8px;
  border-radius: 24px;
  transition: background 0.2s;
}
.logo:hover {
  background: var(--color-accent-light);
}
.logo-img {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  object-fit: cover;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.12);
  border: 1.5px solid rgba(245, 80, 0, 0.15);
}
.nav-links {
  display: flex;
  gap: 32px;
  align-items: center;
}
.nav-links a {
  font-size: 14px;
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
.nav-links a:hover {
  color: var(--color-accent);
}

/* ========== Main ========== */
main {
  min-height: calc(100vh - 56px - 80px);
}

/* ========== Footer ========== */
footer {
  border-top: 1px solid var(--color-border);
  padding: 24px;
  margin-top: 80px;
}
.footer-inner {
  max-width: 960px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--color-text-secondary);
}
.footer-links a {
  color: var(--color-text-secondary);
  text-decoration: none;
  transition: color 0.2s;
}
.footer-links a:hover {
  color: var(--color-accent);
}

/* ========== 暗黑模式切换按钮（导航栏右侧） ========== */
.theme-btn {
  background: none;
  border: 1px solid var(--color-border);
  border-radius: 50%;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  font-size: 15px;
  padding: 0;
  transition: border-color 0.2s, background 0.2s;
  color: var(--color-text-secondary);
}
.theme-btn:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}

/* ========== Article (.prose) ========== */
.prose {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 24px;
}
.prose h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  margin: 2em 0 0.8em;
  line-height: 1.3;
}
.prose h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 1.8em 0 0.6em;
  line-height: 1.4;
}
.prose h3 {
  font-size: 1.2rem;
  font-weight: 600;
  margin: 1.5em 0 0.4em;
}
.prose p {
  margin: 1em 0;
  font-size: 16px;
  line-height: 1.9;
}
.prose a {
  color: var(--color-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(245, 80, 0, 0.3);
  transition: border-color 0.2s;
}
.prose a:hover {
  border-bottom-color: var(--color-accent);
}

/* 文章图片 — cursor 指示可点击 */
.prose img {
  max-width: 100%;
  border-radius: 12px;
  margin: 2em auto;
  box-shadow: 0 4px 24px rgba(28, 25, 23, 0.08), 0 1px 4px rgba(28, 25, 23, 0.04);
  display: block;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.prose img:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 32px rgba(28, 25, 23, 0.12), 0 2px 8px rgba(28, 25, 23, 0.06);
}
.prose blockquote {
  border-left: 3px solid var(--color-accent);
  padding: 0.5em 1em;
  margin: 1.5em 0;
  color: var(--color-text-secondary);
  background: var(--color-accent-light);
  border-radius: 0 6px 6px 0;
}
.prose ul,
.prose ol {
  padding-left: 1.5em;
  margin: 1em 0;
}
.prose li {
  margin: 0.3em 0;
}
.prose code {
  background: #f5f5f4;
  padding: 2px 6px;
  border-radius: 4px;
  font-size: 0.9em;
}
[data-theme="dark"] .prose code {
  background: #2a2a2e;
}
.prose pre {
  background: #1c1917;
  color: #e7e5e4;
  padding: 1em;
  border-radius: 8px;
  overflow-x: auto;
  margin: 1.5em 0;
}
.prose pre code {
  background: none;
  padding: 0;
  color: inherit;
}
.prose strong {
  font-weight: 600;
}

/* ========== CTA Box (from article pages) ========== */
.cta-box {
  max-width: var(--max-width);
  margin: 3em auto;
  padding: 2em;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  text-align: center;
}
.cta-box p {
  color: var(--color-text-secondary);
  margin-bottom: 1em;
  font-size: 15px;
}

/* ========== Article header ========== */
.article-header {
  margin: 48px 0 32px;
}
.article-header h1 {
  font-family: var(--font-serif);
  font-size: 2rem;
  font-weight: 600;
  line-height: 1.3;
  margin-bottom: 12px;
}
.article-meta {
  font-size: 14px;
  color: var(--color-text-secondary);
  display: flex;
  gap: 12px;
  align-items: center;
  flex-wrap: wrap;
}
.article-series {
  background: var(--color-accent-light);
  padding: 2px 10px;
  border-radius: 4px;
  font-size: 13px;
}

/* ========== Next chapter nav (书籍章节) ========== */
.next-chapter {
  margin: 3em 0 2em;
  max-width: var(--max-width);
  margin-left: auto;
  margin-right: auto;
  padding: 0 24px;
}
.next-chapter-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 24px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-accent);
  border-radius: 10px;
  text-decoration: none;
  color: var(--color-accent);
  transition: all 0.2s ease;
}
.next-chapter-link:hover {
  background: var(--color-accent);
  color: white;
}
.next-label {
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
}
.next-title {
  font-family: var(--font-serif);
  font-size: 16px;
  font-weight: 600;
  flex: 1;
  text-align: center;
}
.next-arrow {
  font-size: 18px;
  transition: transform 0.2s;
}
.next-chapter-link:hover .next-arrow {
  transform: translateX(4px);
}

/* ========== CTA buttons ========== */
.cta-buttons {
  display: flex;
  gap: 16px;
  justify-content: center;
  flex-wrap: wrap;
}
.cta-btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 28px;
  border-radius: 8px;
  font-size: 15px;
  font-weight: 500;
  text-decoration: none;
  transition: all 0.2s ease;
  min-width: 140px;
  justify-content: center;
}
.cta-btn-primary {
  background: var(--color-accent);
  color: white !important;
}
.cta-btn-primary:hover {
  opacity: 0.9;
  transform: translateY(-1px);
}
.cta-btn-secondary {
  background: #1c1917;
  color: white !important;
}
[data-theme="dark"] .cta-btn-secondary {
  background: #3f3f46;
}
.cta-btn-secondary:hover {
  background: #2d2a26;
  transform: translateY(-1px);
}

/* ========== Book Page ========== */
html { scroll-behavior: smooth; }
.book-page { padding: 48px 24px; }
.book-inner { max-width: 720px; margin: 0 auto; }

.book-section { margin-bottom: 64px; }
.book-divider {
  height: 1px;
  background: var(--color-border);
  margin: 64px auto;
  max-width: 200px;
}

.book-hero { display: flex; gap: 48px; align-items: flex-start; margin-bottom: 48px; }
.book-cover { flex-shrink: 0; }
.book-cover-img {
  width: 200px; height: auto;
  border-radius: 6px;
  box-shadow: 0 12px 40px rgba(0,0,0,0.18), 0 4px 12px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.book-cover-img:hover {
  transform: translateY(-4px) scale(1.02);
  box-shadow: 0 20px 60px rgba(0,0,0,0.25), 0 8px 24px rgba(0,0,0,0.15);
}
.book-details h1 {
  font-family: var(--font-serif);
  font-size: 1.8rem;
  font-weight: 600; margin-bottom: 8px;
}
.tagline { color: var(--color-accent); font-weight: 500; font-size: 1.05rem; margin-bottom: 4px; }
.motto {
  font-family: var(--font-serif);
  color: var(--color-text-secondary);
  font-style: italic;
  margin-bottom: 16px;
  font-size: 15px;
}
.book-details p { color: var(--color-text-secondary); line-height: 1.8; margin-bottom: 12px; }

.chapters { margin-top: 16px; }
.chapters h2 { font-family: var(--font-serif); font-size: 1.3rem; margin-bottom: 24px; }
.chapter-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 0;
}
.chapter-item {
  display: flex; gap: 12px; padding: 14px 16px;
  border-bottom: 1px solid var(--color-border);
  align-items: flex-start;
  text-decoration: none;
  color: inherit;
  transition: background 0.15s;
}
.chapter-item:hover { background: var(--color-accent-light); }
.chapter-num {
  font-size: 1.2rem; font-weight: 300; color: var(--color-accent);
  width: 30px; flex-shrink: 0; line-height: 1.5;
}
.chapter-item strong { font-size: 14px; display: block; }
.chapter-item p { font-size: 13px; color: var(--color-text-secondary); margin: 2px 0 0; }

/* ========== Community Page ========== */
.community-hero {
  padding: 100px 24px 80px;
  text-align: center;
  background: linear-gradient(180deg, rgba(245,80,0,0.04) 0%, transparent 100%);
  border-bottom: 1px solid var(--color-border);
}
.community-hero-inner { max-width: 560px; margin: 0 auto; }
.hero-badge {
  display: inline-block;
  padding: 6px 16px;
  background: rgba(245,80,0,0.1);
  color: var(--color-accent);
  border-radius: 20px;
  font-size: 14px;
  font-weight: 500;
  margin-bottom: 20px;
}
.community-hero h1 {
  font-family: var(--font-serif);
  font-size: 2.8rem;
  font-weight: 600;
  margin-bottom: 12px;
  letter-spacing: 0.02em;
}
.hero-sub {
  font-size: 1.15rem;
  color: var(--color-text-secondary);
  margin-bottom: 24px;
}
.hero-price { margin: 24px 0 28px; }
.price-tag { font-size: 3rem; font-weight: 700; color: var(--color-accent); }
.price-period { font-size: 1.2rem; color: var(--color-text-secondary); }

.section { padding: 64px 24px; }
.section-inner { max-width: 960px; margin: 0 auto; }
.section-title {
  font-family: var(--font-serif);
  font-size: 1.6rem;
  font-weight: 600;
  text-align: center;
  margin-bottom: 40px;
}
.section-accent { background: rgba(245,80,0,0.03); }

.benefits-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 24px;
}
.benefit-card {
  padding: 28px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  text-align: center;
  transition: box-shadow 0.2s, transform 0.2s;
}
.benefit-card:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.06); transform: translateY(-2px); }
.benefit-icon { font-size: 2rem; margin-bottom: 12px; }
.benefit-card h3 { font-size: 1.1rem; font-weight: 600; margin-bottom: 8px; }
.benefit-card p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.6; }

.philosophy { max-width: 640px; margin: 0 auto; text-align: center; }
.philosophy h2 { font-family: var(--font-serif); font-size: 2rem; font-weight: 600; margin-bottom: 16px; }
.philosophy-lead { font-size: 1.2rem; color: var(--color-accent); font-weight: 500; margin-bottom: 16px; }
.philosophy p { color: var(--color-text-secondary); margin-bottom: 12px; line-height: 1.8; }

.content-list { display: flex; flex-direction: column; gap: 20px; }
.content-item {
  padding: 28px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 12px;
  transition: box-shadow 0.2s;
}
.content-item:hover { box-shadow: 0 4px 20px rgba(0,0,0,0.06); }
.content-tag {
  display: inline-block;
  padding: 4px 12px;
  background: var(--color-accent-light);
  color: var(--color-accent);
  border-radius: 4px;
  font-size: 13px;
  font-weight: 500;
  margin-bottom: 12px;
}
.content-item h3 { font-size: 1.2rem; font-weight: 600; margin-bottom: 8px; }
.content-item p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.6; }

.pricing-card {
  max-width: 440px;
  margin: 0 auto;
  padding: 40px;
  background: var(--color-card-bg);
  border: 2px solid var(--color-accent);
  border-radius: 16px;
  text-align: center;
}
.pricing-card h2 { font-family: var(--font-serif); font-size: 1.6rem; font-weight: 600; margin-bottom: 16px; }
.pricing-price { margin: 24px 0; }
.price-number { font-size: 3.5rem; font-weight: 700; color: var(--color-accent); }
.price-unit { font-size: 1.2rem; color: var(--color-text-secondary); }
.pricing-features { list-style: none; text-align: left; margin: 28px 0; padding: 0; }
.pricing-features li { padding: 10px 0; font-size: 15px; border-bottom: 1px solid var(--color-border); }
.pricing-features li:last-child { border-bottom: none; }
.pricing-note { margin-top: 16px; font-size: 13px; color: var(--color-text-secondary); }

.faq-list { max-width: 640px; margin: 0 auto; }
.faq-item { padding: 24px 0; border-bottom: 1px solid var(--color-border); }
.faq-item:last-child { border-bottom: none; }
.faq-item h3 { font-size: 1.05rem; font-weight: 600; margin-bottom: 8px; }
.faq-item p { font-size: 14px; color: var(--color-text-secondary); line-height: 1.7; }

/* ========== Resources Page ========== */
.resources-page { padding: 48px 24px; }
.resources-inner { max-width: 720px; margin: 0 auto; }
.resources-header { text-align: center; margin-bottom: 48px; }
.resources-header h1 { font-family: var(--font-serif); font-size: 2rem; font-weight: 600; margin-bottom: 12px; }
.resources-header p { color: var(--color-text-secondary); font-size: 1.05rem; }
.resource-category { margin-bottom: 48px; }
.resource-category h2 { font-family: var(--font-serif); font-size: 1.4rem; font-weight: 600; margin-bottom: 20px; padding-bottom: 8px; border-bottom: 2px solid var(--color-accent); display: inline-block; }
.resource-list { display: flex; flex-direction: column; gap: 12px; }
.resource-item {
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 16px 20px;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  text-decoration: none;
  color: inherit;
  transition: box-shadow 0.2s, border-color 0.2s;
}
.resource-item:hover { box-shadow: 0 4px 16px rgba(0,0,0,0.06); border-color: var(--color-accent); }
.resource-icon {
  font-size: 1.5rem;
  width: 40px; height: 40px;
  display: flex; align-items: center; justify-content: center;
  background: var(--color-accent-light);
  border-radius: 8px;
  flex-shrink: 0;
}
.resource-info { flex: 1; }
.resource-info strong { font-size: 15px; display: block; margin-bottom: 2px; }
.resource-info span { font-size: 13px; color: var(--color-text-secondary); }
.resource-download {
  padding: 6px 16px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 6px;
  font-size: 13px;
  font-weight: 500;
  text-decoration: none;
  transition: opacity 0.2s;
  flex-shrink: 0;
}
.resource-download:hover { opacity: 0.9; }

/* ========== Hero (index page) ========== */
.hero {
  padding: 48px 24px 40px;
  border-bottom: 1px solid var(--color-border);
}
.hero-inner {
  max-width: 960px;
  margin: 0 auto;
}
.hero h1 {
  font-size: clamp(1.55rem, 2.6vw, 2.25rem);
  font-weight: 750;
  letter-spacing: -0.01em;
  line-height: 1.18;
  margin-bottom: 6px;
  color: var(--color-text);
}
.hero-cn {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin-bottom: 22px;
}
.hero-habit {
  font-size: clamp(1.35rem, 2vw, 1.7rem);
  font-weight: 800;
  color: var(--color-text);
  margin-bottom: 6px;
  letter-spacing: -0.02em;
}
.hero-habit-cn {
  font-size: 1rem;
  color: var(--color-text-secondary);
  margin-bottom: 26px;
}
.hero-actions {
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}
.btn-primary {
  display: inline-block;
  padding: 10px 24px;
  background: var(--color-accent);
  color: #fff;
  border-radius: 8px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: opacity 0.2s, transform 0.2s;
}
.btn-primary:hover { opacity: 0.88; transform: translateY(-1px); }
.btn-large {
  padding: 14px 32px;
  font-size: 1.05rem;
}
.btn-full {
  width: 100%;
}
.btn-secondary {
  display: inline-block;
  padding: 10px 24px;
  background: transparent;
  color: var(--color-text);
  border: 1px solid var(--color-border);
  border-radius: 8px;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  transition: border-color 0.2s, color 0.2s;
}
.btn-secondary:hover {
  border-color: var(--color-accent);
  color: var(--color-accent);
}

/* ========== Card Grid (index page) ========== */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 20px;
}

/* ========== Books Preview (index page) ========== */
.books-preview {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.book-preview-card {
  display: flex;
  gap: 16px;
  align-items: center;
  text-decoration: none;
  color: inherit;
  padding: 16px;
  border: 1px solid var(--color-border);
  border-radius: 12px;
  transition: box-shadow 0.2s, transform 0.2s;
}
.book-preview-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transform: translateY(-2px);
}
.book-preview-cover {
  width: 60px;
  height: auto;
  border-radius: 4px;
  flex-shrink: 0;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
}
.book-preview-card h3 {
  font-size: 1rem;
  font-weight: 600;
  margin-bottom: 4px;
}
.book-preview-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0;
}

/* ========== Community Preview (index page) ========== */
.section-community {
  padding: 32px 24px;
}
.community-preview {
  max-width: 720px;
  margin: 0 auto;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 14px;
  overflow: hidden;
}
.community-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0;
  border-bottom: 1px solid var(--color-border);
}
.community-card {
  padding: 24px;
  text-align: center;
  border-right: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  align-items: center;
  cursor: default;
  transition: background 0.15s;
}
.community-card:last-child {
  border-right: none;
}
.community-card:hover {
  background: var(--color-accent-light);
}
.community-icon-wrap {
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(245,80,0,0.06);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 12px;
}
.community-card .community-icon {
  font-size: 18px;
  color: var(--color-accent);
}
.community-card h4 {
  font-size: 1rem;
  font-weight: 600;
  margin: 0 0 6px;
  color: var(--color-text);
}
.community-card p {
  font-size: 13px;
  color: var(--color-text-secondary);
  line-height: 1.5;
  margin: 0;
}
.community-cta {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 20px;
  padding: 18px 24px;
}
.community-stat {
  display: flex;
  align-items: baseline;
  gap: 6px;
  font-size: 15px;
  color: var(--color-text-secondary);
}
.community-stat strong {
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-text);
}
.community-cta .btn-primary {
  padding: 9px 22px;
  font-size: 14px;
  border-radius: 7px;
}

/* ========== PostCard component ========== */
.post-card {
  text-decoration: none;
  color: inherit;
  background: var(--color-card-bg);
  border: 1px solid var(--color-border);
  border-radius: 10px;
  transition: box-shadow 0.2s, transform 0.2s, border-color 0.2s;
  display: block;
  overflow: hidden;
}
.post-card:hover {
  box-shadow: 0 4px 16px rgba(0,0,0,0.06);
  transform: translateY(-2px);
  border-color: var(--color-accent);
}
.post-card-body {
  padding: 20px;
}
.post-card-date {
  font-size: 13px;
  color: var(--color-text-secondary);
}
.post-card h3 {
  font-size: 1.1rem;
  font-weight: 600;
  margin: 8px 0;
  line-height: 1.4;
  color: var(--color-text);
}
.post-card p {
  font-size: 14px;
  color: var(--color-text-secondary);
  line-height: 1.6;
  display: -webkit-box;
  -webkit-line-clamp: 2;
  -webkit-box-orient: vertical;
  overflow: hidden;
  margin: 0;
}

/* ========== SectionHeader component ========== */
.section-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: 32px;
}
.section-header h2 {
  font-family: var(--font-serif);
  font-size: 1.5rem;
  font-weight: 600;
  margin: 0;
}
.see-all {
  font-size: 14px;
  color: var(--color-accent);
  text-decoration: none;
}
.see-all:hover { text-decoration: underline; }

/* ========== BookChapterItem component ========== */
.book-chapter-item {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 14px 16px;
  text-decoration: none;
  color: inherit;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  transition: border-color 0.2s, background 0.2s;
}
.book-chapter-item:hover {
  border-color: var(--color-accent);
  background: var(--color-accent-light);
}
.book-chapter-item .chapter-num {
  flex-shrink: 0;
  width: 36px;
  height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 8px;
  background: var(--color-bg);
  font-size: 13px;
  font-weight: 600;
  color: var(--color-text-secondary);
}
.book-chapter-item .chapter-info strong {
  display: block;
  font-size: 15px;
  font-weight: 600;
  margin-bottom: 2px;
}
.book-chapter-item .chapter-info p {
  font-size: 13px;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
}

/* ========== Responsive ========== */
@media (max-width: 640px) {
  .nav-inner {
    padding: 0 16px;
  }
  .nav-links {
    gap: 20px;
  }
  .prose {
    padding: 0 16px;
  }
  .prose h1 {
    font-size: 1.6rem;
  }
  .footer-inner {
    flex-direction: column;
    gap: 8px;
    text-align: center;
  }
  .next-chapter {
    padding: 0 16px;
  }
  .next-chapter-link {
    flex-direction: column;
    gap: 8px;
    padding: 16px;
  }
  .next-title {
    text-align: center;
  }
  .book-hero { flex-direction: column; align-items: center; text-align: center; }
  .chapter-grid { grid-template-columns: 1fr; }
  .benefits-grid { grid-template-columns: 1fr; }
  .community-hero h1 { font-size: 2.2rem; }
  .community-hero { padding: 60px 24px 48px; }
  .pricing-card { padding: 28px 20px; }
}