/* ==========================================================================
   DeepSeek Harness 完全指南 —— 样式
   设计方向：工程师手册 / 编辑式技术文档
   ========================================================================== */

:root {
  /* 配色 */
  --bg: #f6f5f1;
  --surface: #ffffff;
  --surface-2: #fbfaf7;
  --ink: #161d2e;
  --ink-soft: #3f4a61;
  --muted: #8a93a6;
  --line: #e7e4dc;
  --line-strong: #d8d4c9;

  --accent: #3b5bdb;
  --accent-strong: #2f46c9;
  --accent-soft: #eef1ff;
  --teal: #0d9488;
  --teal-soft: #e6f6f4;

  --code-bg: #101725;
  --code-ink: #dbe2f0;
  --code-accent: #8ab4ff;
  --code-muted: #6b7a99;

  --warn: #b45309;
  --warn-soft: #fdf3e3;

  /* 字体 */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'PingFang SC',
    'Hiragino Sans GB', 'Microsoft YaHei', sans-serif;
  --font-mono: 'SFMono-Regular', Consolas, 'Liberation Mono', Menlo,
    'Courier New', monospace;

  /* 尺寸 */
  --header-h: 64px;
  --radius: 14px;
  --radius-sm: 9px;
  --shadow-sm: 0 1px 2px rgba(22, 29, 46, 0.05);
  --shadow-md: 0 10px 30px -12px rgba(22, 29, 46, 0.18);
  --shadow-lg: 0 24px 60px -24px rgba(22, 29, 46, 0.28);
}

/* ---------- 基础 ---------- */
* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink);
  background-color: var(--bg);
  background-image:
    radial-gradient(circle at 12% -4%, rgba(59, 91, 219, 0.07), transparent 42%),
    radial-gradient(circle at 88% 8%, rgba(13, 148, 136, 0.05), transparent 38%),
    linear-gradient(rgba(22, 29, 46, 0.022) 1px, transparent 1px),
    linear-gradient(90deg, rgba(22, 29, 46, 0.022) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 42px 42px, 42px 42px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-strong); }

img { max-width: 100%; height: auto; }

::selection { background: rgba(59, 91, 219, 0.18); }

/* ---------- 阅读进度条 ---------- */
.progress-bar {
  position: fixed;
  top: 0; left: 0;
  height: 3px;
  width: 0;
  background: linear-gradient(90deg, var(--accent), var(--teal));
  z-index: 1000;
  transition: width 0.08s linear;
}

/* ---------- 顶栏 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  height: var(--header-h);
  background: rgba(246, 245, 241, 0.82);
  backdrop-filter: saturate(160%) blur(12px);
  -webkit-backdrop-filter: saturate(160%) blur(12px);
  border-bottom: 1px solid var(--line);
}

.site-header__inner {
  max-width: 1280px;
  margin: 0 auto;
  padding: 0 28px;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: var(--ink);
}
.brand:hover { color: var(--ink); }

.brand__mark {
  display: inline-flex;
  filter: drop-shadow(0 2px 6px rgba(47, 70, 201, 0.35));
}

.brand__text {
  display: flex;
  align-items: baseline;
  gap: 8px;
}
.brand__name {
  font-weight: 700;
  font-size: 17px;
  letter-spacing: -0.01em;
}
.brand__tag {
  font-size: 12px;
  font-weight: 600;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 1px 8px;
  border-radius: 999px;
  line-height: 1.5;
}

.site-nav {
  display: flex;
  align-items: center;
  gap: 6px;
}
.site-nav__link {
  color: var(--ink-soft);
  font-size: 14px;
  font-weight: 500;
  padding: 7px 13px;
  border-radius: 9px;
  transition: background 0.15s, color 0.15s;
}
.site-nav__link:hover {
  color: var(--ink);
  background: rgba(22, 29, 46, 0.05);
}

.menu-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  width: 42px;
  height: 42px;
  padding: 0 10px;
  background: transparent;
  border: 1px solid var(--line-strong);
  border-radius: 10px;
  cursor: pointer;
}
.menu-toggle span {
  display: block;
  height: 2px;
  background: var(--ink);
  border-radius: 2px;
  transition: transform 0.2s, opacity 0.2s;
}
.menu-toggle.is-open span:nth-child(1) { transform: translateY(7px) rotate(45deg); }
.menu-toggle.is-open span:nth-child(2) { opacity: 0; }
.menu-toggle.is-open span:nth-child(3) { transform: translateY(-7px) rotate(-45deg); }

/* ---------- 布局：侧栏 + 内容 ---------- */
.layout {
  display: flex;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 28px;
  gap: 56px;
}

/* ---------- 侧栏 ---------- */
.sidebar {
  flex: 0 0 264px;
  width: 264px;
}
.sidebar__inner {
  position: sticky;
  top: var(--header-h);
  height: calc(100vh - var(--header-h));
  display: flex;
  flex-direction: column;
  padding: 34px 0 24px;
}

.sidebar__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 14px;
  padding: 0 6px;
}
.sidebar__title {
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.sidebar__count {
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 1px 9px;
  border-radius: 999px;
}

.toc {
  display: flex;
  flex-direction: column;
  gap: 2px;
  overflow-y: auto;
  flex: 1;
  padding-right: 4px;
}
.toc__item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 10px 12px;
  border-radius: 11px;
  color: var(--ink-soft);
  border: 1px solid transparent;
  transition: background 0.15s, border-color 0.15s, color 0.15s;
}
.toc__item:hover {
  background: var(--surface);
  color: var(--ink);
}
.toc__item.is-active {
  background: var(--surface);
  border-color: var(--line);
  color: var(--ink);
  box-shadow: var(--shadow-sm);
}
.toc__num {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
  padding-top: 3px;
  min-width: 20px;
}
.toc__item.is-active .toc__num { color: var(--accent); }
.toc__body { display: flex; flex-direction: column; gap: 2px; }
.toc__title { font-size: 14px; font-weight: 600; line-height: 1.4; }
.toc__reading { font-size: 12px; color: var(--muted); }

.sidebar__foot {
  margin-top: 16px;
  padding: 14px 6px 0;
  border-top: 1px solid var(--line);
}
.sidebar__foot a {
  font-size: 13px;
  font-weight: 600;
}

/* ---------- 内容区 ---------- */
.content {
  flex: 1;
  min-width: 0;
  max-width: 760px;
  margin: 0 auto;
  padding: 52px 0 88px;
}

/* ---------- 章节头部 ---------- */
.chapter-head {
  padding-bottom: 28px;
  margin-bottom: 36px;
  border-bottom: 1px solid var(--line);
}
.chapter-kicker {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 16px;
}
.chapter-num {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--accent);
  background: var(--accent-soft);
  padding: 4px 12px;
  border-radius: 999px;
}
.chapter-reading {
  font-size: 13px;
  color: var(--muted);
}
.chapter-title {
  margin: 0 0 14px;
  font-size: clamp(28px, 4.5vw, 40px);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.2;
  color: var(--ink);
}
.chapter-desc {
  margin: 0;
  font-size: 17px;
  color: var(--ink-soft);
  line-height: 1.6;
}

/* ---------- 章节正文 ---------- */
.chapter-body {
  font-size: 16.5px;
  color: var(--ink);
}

.chapter-body h2 {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  margin: 46px 0 16px;
  padding-left: 16px;
  position: relative;
}
.chapter-body h2::before {
  content: '';
  position: absolute;
  left: 0; top: 6px; bottom: 6px;
  width: 4px;
  border-radius: 2px;
  background: linear-gradient(var(--accent), var(--teal));
}

.chapter-body h3 {
  font-size: 19px;
  font-weight: 700;
  margin: 30px 0 12px;
  letter-spacing: -0.01em;
}

.chapter-body p { margin: 0 0 18px; }

.chapter-body .lead {
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.chapter-body strong { font-weight: 700; color: var(--ink); }

.chapter-body ul, .chapter-body ol {
  margin: 0 0 20px;
  padding-left: 24px;
}
.chapter-body li { margin: 6px 0; }
.chapter-body li::marker { color: var(--accent); }

/* 内联代码 */
.chapter-body code {
  font-family: var(--font-mono);
  font-size: 0.85em;
  color: var(--accent-strong);
  background: var(--accent-soft);
  border: 1px solid #dfe5fb;
  padding: 2px 6px;
  border-radius: 6px;
  white-space: nowrap;
}

/* ---------- 代码块 ---------- */
.code-block {
  margin: 24px 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--code-bg);
  border: 1px solid rgba(255, 255, 255, 0.06);
  box-shadow: var(--shadow-md);
}
.code-block__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 10px 16px;
  background: rgba(255, 255, 255, 0.03);
  border-bottom: 1px solid rgba(255, 255, 255, 0.07);
}
.code-block__lang {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--code-muted);
  text-transform: uppercase;
}
.code-block__copy {
  font-family: var(--font-sans);
  font-size: 12px;
  font-weight: 600;
  color: var(--code-ink);
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.1);
  border-radius: 7px;
  padding: 4px 11px;
  cursor: pointer;
  transition: background 0.15s, color 0.15s;
}
.code-block__copy:hover { background: rgba(255, 255, 255, 0.14); }
.code-block__copy.is-copied { color: #7ef0c0; }

.code-block pre {
  margin: 0;
  padding: 18px 20px;
  overflow-x: auto;
}
.code-block pre code {
  font-family: var(--font-mono);
  font-size: 14px;
  line-height: 1.7;
  color: var(--code-ink);
  background: none;
  border: none;
  padding: 0;
  white-space: pre;
}

/* 兼容 JS 未启用时的裸 pre */
.chapter-body pre {
  background: var(--code-bg);
  color: var(--code-ink);
  border-radius: var(--radius);
  padding: 18px 20px;
  overflow-x: auto;
  margin: 24px 0;
}
.chapter-body pre code {
  color: inherit;
  background: none;
  border: none;
  padding: 0;
  white-space: pre;
}

/* ---------- 表格 ---------- */
.chapter-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
  font-size: 15px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}
.chapter-body th,
.chapter-body td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}
.chapter-body thead th {
  background: var(--surface-2);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--ink-soft);
}
.chapter-body tbody tr:last-child td { border-bottom: none; }
.chapter-body tbody tr:hover { background: #fafaf7; }
.chapter-body td code {
  white-space: normal;
  word-break: break-all;
}

/* ---------- 提示框 ---------- */
.callout {
  margin: 26px 0;
  padding: 18px 20px 18px 22px;
  border-radius: var(--radius);
  border: 1px solid var(--line);
  border-left: 4px solid var(--accent);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
}
.callout--tip {
  border-left-color: var(--teal);
  background: var(--teal-soft);
  border-color: #cde9e5;
}
.callout__label {
  display: inline-block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 6px;
}
.callout--tip .callout__label { color: var(--teal); }
.callout__text { margin: 0; font-size: 15.5px; }

/* 一般提示 note */
.note {
  padding: 14px 18px;
  border-radius: var(--radius);
  background: var(--warn-soft);
  border: 1px solid #f0dbb8;
  font-size: 15px;
  color: #6b4411;
}
.note code { background: rgba(180, 83, 9, 0.1); border-color: #ecd3ac; color: #92400e; }

/* ---------- 徽章 / pill ---------- */
.pill {
  display: inline-block;
  font-size: 12px;
  font-weight: 600;
  padding: 2px 10px;
  border-radius: 999px;
  line-height: 1.6;
}
.pill--must { background: #fde8e8; color: #b91c1c; }
.pill--ok   { background: var(--accent-soft); color: var(--accent-strong); }
.pill--opt  { background: #eceff5; color: var(--muted); }

/* ---------- 特性网格（首页第一章） ---------- */
.feature-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 24px 0;
}
.feature {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 18px 18px 16px;
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.feature:hover {
  transform: translateY(-3px);
  border-color: #cdd6f3;
  box-shadow: var(--shadow-md);
}
.feature__icon { font-size: 22px; display: block; margin-bottom: 8px; }
.feature h3 { font-size: 16px; margin: 0 0 6px; }
.feature p { font-size: 14px; line-height: 1.6; color: var(--ink-soft); margin: 0; }

/* ---------- FAQ ---------- */
.faq { display: flex; flex-direction: column; gap: 12px; margin: 24px 0; }
.faq__item {
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: 16px 20px;
}
.faq__item h3 { margin: 0 0 8px; font-size: 16px; }
.faq__item p { margin: 0; font-size: 15px; color: var(--ink-soft); }

/* ---------- 上一章 / 下一章 ---------- */
.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
  margin-top: 56px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}
.pager__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.pager__item:hover {
  transform: translateY(-2px);
  border-color: #cdd6f3;
  box-shadow: var(--shadow-md);
  color: var(--ink);
}
.pager__item--next { text-align: right; align-items: flex-end; }
.pager__label {
  font-size: 13px;
  font-weight: 600;
  color: var(--accent);
}
.pager__title {
  font-size: 15px;
  font-weight: 700;
  line-height: 1.4;
}
.pager__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--muted);
  margin-right: 8px;
}

/* ---------- 首页 Hero ---------- */
.home { max-width: 1080px; margin: 0 auto; padding: 0 28px; }

.hero {
  position: relative;
  text-align: center;
  padding: 92px 24px 76px;
}
.hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 50% -10%, rgba(59, 91, 219, 0.12), transparent 55%),
    radial-gradient(circle at 78% 12%, rgba(13, 148, 136, 0.08), transparent 45%);
  pointer-events: none;
}

.hero__badges {
  display: flex;
  justify-content: center;
  gap: 10px;
  margin-bottom: 28px;
  flex-wrap: wrap;
}
.badge {
  font-size: 13px;
  font-weight: 600;
  color: var(--ink-soft);
  background: var(--surface);
  border: 1px solid var(--line);
  padding: 5px 14px;
  border-radius: 999px;
  box-shadow: var(--shadow-sm);
}

.hero__title {
  margin: 0 0 22px;
  font-size: clamp(40px, 7vw, 68px);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--ink);
}
.hero__title em {
  font-style: normal;
  background: linear-gradient(120deg, var(--accent), var(--teal));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  color: transparent;
}

.hero__sub {
  margin: 0 auto 32px;
  max-width: 560px;
  font-size: 18px;
  line-height: 1.7;
  color: var(--ink-soft);
}

.hero__actions {
  display: flex;
  justify-content: center;
  gap: 14px;
  flex-wrap: wrap;
}
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 15px;
  font-weight: 700;
  padding: 13px 26px;
  border-radius: 12px;
  transition: transform 0.15s, box-shadow 0.15s, background 0.15s;
}
.btn--primary {
  color: #fff;
  background: linear-gradient(135deg, var(--accent), var(--accent-strong));
  box-shadow: 0 12px 28px -10px rgba(47, 70, 201, 0.55);
}
.btn--primary:hover { color: #fff; transform: translateY(-2px); box-shadow: 0 16px 32px -10px rgba(47, 70, 201, 0.6); }
.btn--ghost {
  color: var(--ink);
  background: var(--surface);
  border: 1px solid var(--line-strong);
}
.btn--ghost:hover { color: var(--ink); transform: translateY(-2px); box-shadow: var(--shadow-md); }

.hero__meta {
  margin-top: 34px;
  font-size: 14px;
  color: var(--muted);
  display: flex;
  justify-content: center;
  gap: 12px;
}
.hero__dot { opacity: 0.5; }

/* ---------- 章节目录网格 ---------- */
.chapter-grid { padding: 16px 0 96px; }
.chapter-grid__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  margin-bottom: 24px;
}
.chapter-grid__title {
  margin: 0;
  font-size: 24px;
  font-weight: 800;
  letter-spacing: -0.01em;
}
.chapter-grid__hint { font-size: 14px; color: var(--muted); }

.chapter-grid__list {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}
.chapter-card {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  padding: 22px;
  background: var(--surface);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: var(--ink);
  transition: transform 0.18s, box-shadow 0.18s, border-color 0.18s;
}
.chapter-card:hover {
  transform: translateY(-3px);
  border-color: #cdd6f3;
  box-shadow: var(--shadow-md);
  color: var(--ink);
}
.chapter-card__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  color: var(--accent);
  line-height: 1.2;
  flex-shrink: 0;
}
.chapter-card__body { display: flex; flex-direction: column; gap: 5px; flex: 1; }
.chapter-card__title { font-size: 16px; font-weight: 700; }
.chapter-card__desc { font-size: 13.5px; line-height: 1.6; color: var(--ink-soft); }
.chapter-card__meta {
  font-size: 12.5px;
  color: var(--muted);
  flex-shrink: 0;
  padding-top: 3px;
}

/* ---------- 页脚 ---------- */
.site-footer {
  border-top: 1px solid var(--line);
  background: var(--surface-2);
  padding: 40px 28px 56px;
}
.site-footer__inner {
  max-width: 1080px;
  margin: 0 auto;
  text-align: center;
}
.site-footer p {
  margin: 4px 0;
  font-size: 14px;
  color: var(--muted);
}
.site-footer a { font-weight: 600; }

/* ---------- 回到顶部 ---------- */
.back-top {
  position: fixed;
  right: 24px;
  bottom: 24px;
  width: 44px;
  height: 44px;
  border-radius: 12px;
  border: 1px solid var(--line-strong);
  background: var(--surface);
  color: var(--ink);
  font-size: 18px;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  opacity: 0;
  pointer-events: none;
  transform: translateY(8px);
  transition: opacity 0.2s, transform 0.2s;
  z-index: 90;
}
.back-top.is-visible {
  opacity: 1;
  pointer-events: auto;
  transform: translateY(0);
}

/* ---------- 遮罩 ---------- */
.sidebar-overlay {
  position: fixed;
  inset: 0;
  background: rgba(16, 23, 37, 0.4);
  backdrop-filter: blur(2px);
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.25s;
  z-index: 90;
}
.sidebar-overlay.is-visible { opacity: 1; pointer-events: auto; }

/* ---------- 移动端下拉菜单（默认隐藏，仅移动端显示） ---------- */
.mobile-menu { display: none; }

/* ---------- 响应式 ---------- */
@media (max-width: 960px) {
  .layout { gap: 32px; }
  .sidebar { flex-basis: 230px; width: 230px; }
  .chapter-grid__list { grid-template-columns: 1fr; }
}

@media (max-width: 820px) {
  .menu-toggle { display: flex; }

  .site-nav { display: none; }
  .sidebar { display: none; }

  .layout { padding: 0 20px; }

  .mobile-menu {
    display: block;
    position: absolute;
    top: var(--header-h);
    left: 0; right: 0;
    background: var(--surface);
    border-bottom: 1px solid var(--line);
    box-shadow: var(--shadow-lg);
    padding: 8px 20px 20px;
    max-height: calc(100vh - var(--header-h));
    overflow-y: auto;
    opacity: 0;
    transform: translateY(-8px);
    pointer-events: none;
    transition: opacity 0.22s, transform 0.22s;
    z-index: 99;
  }
  .mobile-menu.is-open {
    opacity: 1;
    transform: translateY(0);
    pointer-events: auto;
  }
  .mobile-menu__group {
    display: flex;
    flex-direction: column;
    padding: 8px 0;
  }
  .mobile-menu__group + .mobile-menu__group {
    border-top: 1px solid var(--line);
    margin-top: 6px;
    padding-top: 14px;
  }
  .mobile-menu__title {
    font-size: 12px;
    font-weight: 700;
    letter-spacing: 0.08em;
    text-transform: uppercase;
    color: var(--muted);
    margin-bottom: 6px;
    padding: 0 6px;
  }
  .mobile-menu__group a {
    display: block;
    padding: 11px 12px;
    border-radius: 9px;
    color: var(--ink-soft);
    font-weight: 600;
    font-size: 15px;
  }
  .mobile-menu__group a:hover {
    background: var(--accent-soft);
    color: var(--ink);
  }

  .content { padding: 36px 0 72px; }

  .hero { padding: 64px 8px 52px; }
  .hero__sub { font-size: 16.5px; }

  .feature-grid { grid-template-columns: 1fr; }
  .pager { grid-template-columns: 1fr; }
  .pager__item--next { text-align: left; align-items: flex-start; }
}

@media (max-width: 480px) {
  .site-header__inner { padding: 0 18px; }
  .brand__name { font-size: 15px; }
  .brand__tag { display: none; }
  .chapter-body table { display: block; overflow-x: auto; }
  .chapter-body th, .chapter-body td { white-space: nowrap; }
}