/* Claude Skills 完全指南 — common.css
 * 深浅双主题（data-theme="dark" | "light"）
 * Accent: #D97757 (orange) — Anthropic Claude 品牌色
 * 对比度: WCAG AAA (正文 ≥ 7:1)
 */

/* ── DARK THEME (default) ── */
:root,
:root[data-theme="dark"] {
  --bg:            #0d1117;
  --surface:       #161b22;
  --surface-2:     #21262d;
  --card:          #1c2128;
  --card-hover:    #262c36;
  --border:        rgba(180,185,210,0.12);
  --border-bright: rgba(180,185,210,0.26);
  --text:          #e6edf3;  /* 主文字 — 对 #0d1117 约 15:1 */
  --text-2:        #c9d1d9;  /* 正文 — 对 #0d1117 约 12:1 AAA */
  --text-3:        #8b949e;  /* 辅助 — 对 #0d1117 约 5.5:1 AA */
  --accent:        #D97757;
  --accent-2:      #E89B85;
  --accent-soft:   #F2CDBE;
  --accent-glow:   rgba(217,119,87,0.22);
  --accent-tint:   rgba(217,119,87,0.10);
  --accent-tint-2: rgba(217,119,87,0.06);
  --green:         #4ade80;
  --blue:          #60a5fa;
  --red:           #f87171;
  --yellow:        #fbbf24;
  --cyan:          #22d3ee;
  --code-bg:       #090d12;
  --inline-code-bg: rgba(217,119,87,0.14);
  --inline-code-color: #F2CDBE;
  --radius:    10px;
  --radius-lg: 14px;
  color-scheme: dark;
}

/* ── LIGHT THEME ── */
:root[data-theme="light"] {
  --bg:            #fafafa;
  --surface:       #ffffff;
  --surface-2:     #f2f2f5;
  --card:          #ffffff;
  --card-hover:    #f7f7fa;
  --border:        rgba(20,25,40,0.10);
  --border-bright: rgba(20,25,40,0.22);
  --text:          #1a1a23;  /* 主文字 — 对 #fafafa 约 15:1 */
  --text-2:        #2d2d39;  /* 正文 — 对 #fafafa 约 12.5:1 AAA */
  --text-3:        #5a5a6a;  /* 辅助 — 对 #fafafa 约 6.2:1 AA */
  --accent:        #A25538;  /* red-800 — 浅底上加深提升对比 */
  --accent-2:      #BF6344;  /* red-700 */
  --accent-soft:   #D97757;
  --accent-glow:   rgba(162,85,56,0.18);
  --accent-tint:   rgba(162,85,56,0.08);
  --accent-tint-2: rgba(162,85,56,0.04);
  --green:         #15803d;
  --blue:          #1d4ed8;
  --red:           #BF6344;
  --yellow:        #a16207;
  --cyan:          #0e7490;
  --code-bg:       #1e1e28;  /* 浅色主题代码块保持深色便于阅读 */
  --inline-code-bg: rgba(162,85,56,0.10);
  --inline-code-color: #7A3A22;
  color-scheme: light;
}

/* ── SYSTEM PREFERENCE (first visit, no saved choice) ── */
@media (prefers-color-scheme: light) {
  :root:not([data-theme]) {
    --bg:            #fafafa;
    --surface:       #ffffff;
    --surface-2:     #f2f2f5;
    --card:          #ffffff;
    --card-hover:    #f7f7fa;
    --border:        rgba(20,25,40,0.10);
    --border-bright: rgba(20,25,40,0.22);
    --text:          #1a1a23;
    --text-2:        #2d2d39;
    --text-3:        #5a5a6a;
    --accent:        #A25538;
    --accent-2:      #BF6344;
    --accent-soft:   #D97757;
    --accent-glow:   rgba(162,85,56,0.18);
    --accent-tint:   rgba(162,85,56,0.08);
    --accent-tint-2: rgba(162,85,56,0.04);
    --green:         #15803d;
    --blue:          #1d4ed8;
    --red:           #BF6344;
    --yellow:        #a16207;
    --cyan:          #0e7490;
    --code-bg:       #1e1e28;
    --inline-code-bg: rgba(162,85,56,0.10);
    --inline-code-color: #7A3A22;
    color-scheme: light;
  }
}

*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
html { scroll-behavior: smooth; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: 'SF Pro Text', -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC', 'Hiragino Sans GB', sans-serif;
  font-size: 16px;
  line-height: 1.75;
  min-height: 100vh;
  transition: background-color 0.25s ease, color 0.25s ease;
}

/* ── NAV ── */
.nav {
  position: sticky;
  top: 0;
  z-index: 100;
  display: flex;
  align-items: center;
  gap: 1rem;
  padding: 0 2rem;
  height: 56px;
  background: color-mix(in srgb, var(--bg) 92%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--border);
}
.nav-back {
  color: var(--accent);
  text-decoration: none;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.03em;
  opacity: 0.9;
  transition: opacity 0.2s;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}
.nav-back::before { content: '←'; font-size: 1rem; }
.nav-back:hover { opacity: 1; }
.nav-title {
  flex: 1;
  text-align: center;
  font-size: 0.9rem;
  color: var(--text-2);
  font-weight: 500;
}

/* ── THEME TOGGLE ── */
.theme-toggle {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 999px;
  width: 36px;
  height: 36px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  color: var(--text-2);
  transition: background 0.2s, border-color 0.2s, color 0.2s, transform 0.2s;
  padding: 0;
}
.theme-toggle:hover {
  background: var(--card-hover);
  border-color: var(--border-bright);
  color: var(--accent);
  transform: translateY(-1px);
}
.theme-toggle svg { width: 18px; height: 18px; }
.theme-toggle .icon-moon { display: none; }
.theme-toggle .icon-sun { display: block; }
:root[data-theme="dark"] .theme-toggle .icon-sun { display: none; }
:root[data-theme="dark"] .theme-toggle .icon-moon { display: block; }
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) .theme-toggle .icon-sun { display: none; }
  :root:not([data-theme]) .theme-toggle .icon-moon { display: block; }
}

/* ── HERO (index) ── */
.hero {
  position: relative;
  overflow: hidden;
  padding: 6rem 2rem 5rem;
  text-align: center;
  background: radial-gradient(ellipse 80% 60% at 50% 0%, var(--accent-tint) 0%, var(--surface) 45%, var(--bg) 100%);
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 15% 50%, var(--accent-tint) 0%, transparent 45%),
    radial-gradient(circle at 85% 20%, var(--accent-tint-2) 0%, transparent 40%),
    radial-gradient(circle at 55% 85%, var(--accent-tint-2) 0%, transparent 40%);
  pointer-events: none;
}

/* Orbit animation — 评估节点环绕 */
.orbit-bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
  opacity: 0.55;
}
.orbit-bg .node {
  position: absolute;
  width: 10px; height: 10px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 14px var(--accent);
  animation: orbit 14s linear infinite;
}
.orbit-bg .node:nth-child(1) { left: 20%; top: 30%; animation-delay: 0s; }
.orbit-bg .node:nth-child(2) { left: 75%; top: 45%; animation-delay: -2.3s; background: var(--accent-2); }
.orbit-bg .node:nth-child(3) { left: 50%; top: 70%; animation-delay: -5s; }
.orbit-bg .node:nth-child(4) { left: 30%; top: 65%; animation-delay: -7.5s; background: var(--accent-soft); }
.orbit-bg .node:nth-child(5) { left: 65%; top: 25%; animation-delay: -10s; }
@keyframes orbit {
  0%   { transform: translate(0, 0); opacity: 0.2; }
  50%  { transform: translate(18px, -22px); opacity: 1; }
  100% { transform: translate(0, 0); opacity: 0.2; }
}

.hero-badge {
  display: inline-block;
  padding: 0.35rem 1rem;
  border: 1px solid var(--border-bright);
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin-bottom: 1.5rem;
  background: var(--accent-tint);
  font-weight: 600;
  position: relative;
}
.hero h1 {
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  line-height: 1.2;
  margin-bottom: 1.2rem;
  background: linear-gradient(135deg, var(--accent) 0%, var(--accent-2) 50%, var(--accent-soft) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  position: relative;
}
.hero p {
  font-size: 1.1rem;
  color: var(--text-2);
  max-width: 640px;
  margin: 0 auto 2rem;
  line-height: 1.85;
  position: relative;
}
.hero-meta {
  display: flex;
  justify-content: center;
  gap: 2rem;
  font-size: 0.85rem;
  color: var(--text-3);
  position: relative;
  flex-wrap: wrap;
}
.hero-meta span { display: flex; align-items: center; gap: 0.4rem; }

.hero-cta {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.8rem 2rem;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #fff;
  font-weight: 700;
  font-size: 0.95rem;
  border-radius: 40px;
  text-decoration: none;
  transition: opacity 0.2s, transform 0.2s, box-shadow 0.2s;
  box-shadow: 0 4px 24px var(--accent-glow);
  position: relative;
}
.hero-cta:hover {
  opacity: 0.95;
  transform: translateY(-2px);
  box-shadow: 0 8px 32px var(--accent-glow);
}

.stack-badges {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: 0.55rem;
  margin: 1.5rem 0 2rem;
  position: relative;
}
.stack-badge {
  padding: 0.3rem 0.85rem;
  background: var(--accent-tint);
  border: 1px solid var(--accent-glow);
  border-radius: 20px;
  font-size: 0.78rem;
  color: var(--accent);
  font-weight: 600;
}

/* ── CONTAINER ── */
.container {
  max-width: 1100px;
  margin: 0 auto;
  padding: 4rem 2rem;
}
.section-header {
  text-align: center;
  margin-bottom: 3rem;
}
.section-header h2 {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--text);
  margin-bottom: 0.5rem;
}
.section-header p {
  color: var(--text-3);
  font-size: 0.95rem;
}

/* ── CARDS ── */
.card-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}
.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s, border-color 0.2s, transform 0.2s, box-shadow 0.2s;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  opacity: 0;
  transform: translateY(20px);
  animation: cardIn 0.5s ease forwards;
  box-shadow: 0 1px 2px rgba(0,0,0,0.04);
}
.card:hover {
  background: var(--card-hover);
  border-color: var(--border-bright);
  transform: translateY(-3px);
  box-shadow: 0 10px 32px var(--accent-glow);
}
@keyframes cardIn { to { opacity: 1; transform: translateY(0); } }

.card-num {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.8;
}
.card-title {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  line-height: 1.4;
}
.card-desc {
  font-size: 0.875rem;
  color: var(--text-3);
  line-height: 1.65;
  flex: 1;
}
.card-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.25rem;
}
.tag {
  font-size: 0.72rem;
  padding: 0.2rem 0.55rem;
  border-radius: 6px;
  background: var(--accent-tint);
  color: var(--accent);
  border: 1px solid var(--accent-glow);
  font-weight: 600;
}

/* ── CHAPTER HERO ── */
.chapter-hero {
  padding: 4.5rem 2rem 3.5rem;
  text-align: center;
  background: radial-gradient(ellipse at top, var(--surface) 0%, var(--bg) 70%);
  border-bottom: 1px solid var(--border);
  position: relative;
  overflow: hidden;
}
.chapter-hero::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 200px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--accent-glow), transparent);
}
.ch-num {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: var(--accent);
  opacity: 0.8;
  margin-bottom: 1rem;
}
.chapter-hero h1 {
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.02em;
  margin-bottom: 1rem;
  background: linear-gradient(135deg, var(--accent-2), var(--text));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.chapter-hero p {
  font-size: 1rem;
  color: var(--text-2);
  max-width: 600px;
  margin: 0 auto;
  line-height: 1.85;
}

/* ── CONTENT ── */
.content {
  max-width: 860px;
  margin: 0 auto;
  padding: 3rem 2rem 5rem;
}

.content h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--text);
  margin: 3rem 0 1rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--border);
  position: relative;
}
.content h2::before {
  content: '';
  position: absolute;
  bottom: -1px; left: 0;
  width: 48px; height: 2px;
  background: var(--accent);
  border-radius: 1px;
}
.content h3 {
  font-size: 1.15rem;
  font-weight: 600;
  color: var(--accent-2);
  margin: 2rem 0 0.75rem;
}
.content h4 {
  font-size: 1rem;
  font-weight: 600;
  color: var(--text);
  margin: 1.5rem 0 0.5rem;
}
.content p {
  color: var(--text-2);
  margin-bottom: 1.2rem;
  line-height: 1.85;
}
.content ul, .content ol {
  color: var(--text-2);
  padding-left: 1.5rem;
  margin-bottom: 1.2rem;
}
.content li {
  margin-bottom: 0.45rem;
  line-height: 1.75;
}
.content strong { color: var(--text); font-weight: 700; }
.content a {
  color: var(--accent);
  text-decoration: none;
  border-bottom: 1px dashed var(--accent-glow);
  transition: color 0.15s, border-color 0.15s;
}
.content a:hover { color: var(--accent-2); border-bottom-color: var(--accent); }

/* ── PROGRESS ── */
.progress {
  width: 100%;
  height: 4px;
  background: var(--surface-2);
  border-radius: 2px;
  margin-bottom: 3rem;
  overflow: hidden;
}
.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), var(--accent-2));
  border-radius: 2px;
  box-shadow: 0 0 8px var(--accent-glow);
  transition: width 0.6s ease;
}

/* ── DEF LIST ── */
.def-list { display: flex; flex-direction: column; gap: 0.75rem; margin: 1.5rem 0; }
.def-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  border-left: 3px solid var(--accent);
}
.def-term {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent-2);
  margin-bottom: 0.3rem;
  letter-spacing: 0.02em;
}
.def-desc { font-size: 0.92rem; color: var(--text-2); line-height: 1.75; }

/* ── CALLOUT ── */
.callout {
  border-radius: var(--radius);
  padding: 1rem 1.25rem;
  margin: 1.5rem 0;
  border-left: 3px solid;
  font-size: 0.92rem;
  line-height: 1.75;
  background: var(--surface);
}
.callout strong {
  display: block;
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 0.4rem;
}
.callout.info    { border-color: var(--accent); color: var(--text-2); }
.callout.info strong { color: var(--accent); }
.callout.tip     { border-color: var(--green); color: var(--text-2); }
.callout.tip strong { color: var(--green); }
.callout.warning { border-color: var(--yellow); color: var(--text-2); }
.callout.warning strong { color: var(--yellow); }
.callout.danger  { border-color: var(--red); color: var(--text-2); }
.callout.danger strong { color: var(--red); }

/* ── CODE ── */
pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-top: 2px solid var(--accent);
  border-radius: var(--radius);
  padding: 1.25rem 1.5rem;
  overflow-x: auto;
  margin: 1.5rem 0;
  font-size: 0.875rem;
  line-height: 1.75;
  position: relative;
  color: #e6edf3;
}
pre::before {
  content: attr(data-lang);
  position: absolute;
  top: 0.5rem;
  right: 0.75rem;
  font-size: 0.7rem;
  color: #768390;
  font-family: inherit;
  letter-spacing: 0.05em;
  text-transform: uppercase;
}
code {
  font-family: 'JetBrains Mono', 'Fira Code', 'Cascadia Code', 'SF Mono', Consolas, monospace;
  font-size: 0.875em;
}
p code, li code, td code {
  background: var(--inline-code-bg);
  color: var(--inline-code-color);
  padding: 0.12em 0.42em;
  border-radius: 4px;
  font-size: 0.86em;
  border: 1px solid var(--accent-glow);
}

/* Syntax highlight — 深色代码块统一配色（浅色主题下代码块仍深色） */
.kw { color: #f472b6; font-weight: 600; }
.fn { color: #E89B85; }
.st { color: #4ade80; }
.cm { color: #768390; font-style: italic; }
.ty { color: #22d3ee; }
.nu { color: #fbbf24; }
.at { color: #f87171; }
.pr { color: #60a5fa; }

/* ── TWO COL ── */
.two-col {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1.25rem;
  margin: 1.5rem 0;
}
@media (max-width: 640px) { .two-col { grid-template-columns: 1fr; } }
.two-col-item {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
}
.two-col-item h4 {
  font-size: 0.92rem;
  font-weight: 700;
  color: var(--accent);
  margin-bottom: 0.75rem;
}
.two-col-item ul {
  font-size: 0.88rem;
  color: var(--text-2);
  padding-left: 1.2rem;
  margin-bottom: 0;
}
.two-col-item li { margin-bottom: 0.4rem; }

/* ── ASCII FLOW ── */
.ascii-flow {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.5rem 2rem;
  margin: 1.5rem 0;
  font-family: 'JetBrains Mono', 'Fira Code', monospace;
  font-size: 0.82rem;
  line-height: 1.9;
  color: #c9d1d9;
  overflow-x: auto;
  white-space: pre;
}

/* ── COMPARE TABLE ── */
.compare-table {
  width: 100%;
  border-collapse: collapse;
  margin: 1.5rem 0;
  font-size: 0.885rem;
}
.compare-table th {
  background: var(--surface-2);
  color: var(--accent);
  font-weight: 700;
  padding: 0.75rem 1rem;
  text-align: left;
  border: 1px solid var(--border);
}
.compare-table td {
  padding: 0.7rem 1rem;
  border: 1px solid var(--border);
  color: var(--text-2);
  vertical-align: top;
}
.compare-table tr:nth-child(even) td { background: var(--accent-tint-2); }
.compare-table tr:hover td { background: var(--accent-tint); }

/* ── CHAPTER NAV ── */
.chapter-nav {
  display: flex;
  justify-content: space-between;
  gap: 1rem;
  margin-top: 4rem;
  padding-top: 2rem;
  border-top: 1px solid var(--border);
}
.chapter-nav a {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.875rem 1.25rem;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  transition: background 0.2s, border-color 0.2s;
  min-width: 0;
  max-width: 48%;
}
.chapter-nav a:hover {
  background: var(--card-hover);
  border-color: var(--border-bright);
}
.chapter-nav .label {
  font-size: 0.72rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-3);
}
.chapter-nav .title {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--accent);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.chapter-nav .prev { align-items: flex-start; }
.chapter-nav .next { align-items: flex-end; margin-left: auto; }

/* ── SITE FOOTER ── */
.site-footer {
  text-align: center;
  padding: 1.5rem;
  font-size: 0.82rem;
  color: var(--text-3);
  border-top: 1px solid var(--border);
}
.site-footer a {
  color: var(--accent);
  text-decoration: none;
  opacity: 0.9;
}
.site-footer a:hover { opacity: 1; }

/* ── HIGHLIGHT BOX ── */
.highlight-box {
  background: linear-gradient(135deg, var(--accent-tint), var(--accent-tint-2));
  border: 1px solid var(--border-bright);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  margin: 1.5rem 0;
}

/* ── STEP LIST ── */
.step-list {
  counter-reset: step;
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}
.step-list li {
  counter-increment: step;
  padding: 0.75rem 0.75rem 0.75rem 3.5rem;
  position: relative;
  border-left: 1px solid var(--border);
  margin-left: 1.5rem;
  margin-bottom: 0.5rem;
  color: var(--text-2);
  font-size: 0.92rem;
  line-height: 1.75;
}
.step-list li::before {
  content: counter(step);
  position: absolute;
  left: -1.5rem;
  top: 0.65rem;
  width: 2rem;
  height: 2rem;
  background: var(--card);
  border: 1px solid var(--border-bright);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
}

/* ── METRIC GRID (vLLM 专用 — 性能指标展示) ── */
.metric-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(180px, 1fr));
  gap: 1rem;
  margin: 1.5rem 0;
}
.metric-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 1.25rem;
  text-align: center;
}
.metric-value {
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--accent);
  line-height: 1.2;
  margin-bottom: 0.4rem;
  font-family: 'JetBrains Mono', monospace;
}
.metric-label {
  font-size: 0.78rem;
  color: var(--text-3);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}

/* ── RESPONSIVE ── */
@media (max-width: 768px) {
  .nav { padding: 0 1rem; }
  .content { padding: 2rem 1.25rem 4rem; }
  .chapter-hero { padding: 3rem 1.25rem 2.5rem; }
  .container { padding: 3rem 1.25rem; }
  .ascii-flow { font-size: 0.72rem; padding: 1rem; }
  .compare-table { font-size: 0.8rem; }
  .chapter-nav { flex-direction: column; }
  .chapter-nav a { max-width: 100%; }
  .hero-meta { gap: 1rem; }
}