/* ==========================================================================
   TechWiki · 样式表
   设计语言：暖白纸感 + 墨色文字 + 青绿强调色，暗色模式对应深墨底
   ========================================================================== */

/* ------------------------------------------------------------------ *
 * 1. 设计变量
 * ------------------------------------------------------------------ */

:root {
  --font-sans: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", "PingFang SC",
    "Hiragino Sans GB", "Microsoft YaHei", "Noto Sans SC", sans-serif;
  --font-mono: "SFMono-Regular", ui-monospace, "SF Mono", Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;

  --bg: #faf8f4;
  --bg-sidebar: #f4f1ea;
  --surface: #ffffff;
  --surface-2: #f6f3ec;
  --text: #1b222b;
  --text-2: #4c5663;
  --text-3: #7d8794;
  --border: #e7e2d7;
  --border-strong: #d6d0c2;

  --accent: #0f766e;
  --accent-strong: #0b5d57;
  --accent-ink: #0b4f4a;
  --accent-soft: #e6f3f0;
  --accent-line: rgba(15, 118, 110, 0.26);
  --accent-glow: rgba(15, 118, 110, 0.09);

  --code-bg: #fbfaf7;
  --code-head: #f2efe7;
  --code-text: #2f3a48;
  --code-border: #e7e2d7;
  --code-head-text: #7b8492;
  --code-lang: #425062;
  --code-title: #8a93a0;
  --code-copy-border: #ddd7c9;
  --code-copy-text: #6b7482;
  --code-copy-hover-border: #b9b1a0;
  --code-copy-hover-text: #2f3a48;
  --code-success: #15803d;
  --code-scroll: rgba(27, 34, 43, 0.14);
  --code-shadow: 0 14px 34px -24px rgba(27, 34, 43, 0.28);
  --code-dot: #d8d2c5;
  --code-dot-red: #e88b84;
  --code-dot-yellow: #e3b45f;
  --code-dot-green: #86bd93;

  --tok-comment: #8a919c;
  --tok-string: #2f7d32;
  --tok-keyword: #8b3fb8;
  --tok-number: #b45309;
  --tok-builtin: #0b6fb8;
  --tok-function: #2563eb;
  --tok-property: #0b6fb8;
  --tok-operator: #0f766e;
  --tok-punctuation: #6b7280;
  --tok-tag: #c2410c;
  --tok-attr: #b45309;
  --tok-variable: #1f2937;
  --tok-flag: #b45309;
  --tok-atrule: #8b3fb8;
  --tok-important: #c2410c;
  --tok-color: #b45309;
  --tok-selector: #2563eb;
  --tok-decorator: #b45309;
  --tok-key: #0b6fb8;
  --tok-anchor: #b45309;
  --tok-hunk: #0e7490;
  --tok-added: #15803d;
  --tok-added-bg: rgba(34, 197, 94, 0.08);
  --tok-removed: #b91c1c;
  --tok-removed-bg: rgba(239, 68, 68, 0.08);
  --tok-meta: #8a919c;

  --mark-bg: #fde68a;
  --mark-text: #4a3700;

  --shadow-sm: 0 1px 2px rgba(27, 34, 43, 0.05);
  --shadow-md: 0 14px 40px -22px rgba(27, 34, 43, 0.32);
  --shadow-lg: 0 32px 80px -32px rgba(20, 26, 34, 0.4);

  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;

  --sidebar-w: 286px;
  color-scheme: light;
}

[data-theme="dark"] {
  --bg: #101317;
  --bg-sidebar: #14181d;
  --surface: #181d23;
  --surface-2: #1e242b;
  --text: #e9ecef;
  --text-2: #b3bcc7;
  --text-3: #808b98;
  --border: #272e37;
  --border-strong: #38414c;

  --accent: #2dd4bf;
  --accent-strong: #5eead4;
  --accent-ink: #99f6e4;
  --accent-soft: rgba(45, 212, 191, 0.1);
  --accent-line: rgba(45, 212, 191, 0.3);
  --accent-glow: rgba(45, 212, 191, 0.08);

  --code-bg: #0b0f14;
  --code-head: #121821;
  --code-text: #d5dce6;
  --code-border: rgba(255, 255, 255, 0.07);
  --code-head-text: #8b98ab;
  --code-lang: #c9d4e2;
  --code-title: #7f8ea3;
  --code-copy-border: rgba(255, 255, 255, 0.13);
  --code-copy-text: #93a1b5;
  --code-copy-hover-border: rgba(255, 255, 255, 0.32);
  --code-copy-hover-text: #ffffff;
  --code-success: #4ade80;
  --code-scroll: rgba(255, 255, 255, 0.14);
  --code-shadow: 0 16px 38px -24px rgba(8, 12, 18, 0.65);
  --code-dot: #3b4552;
  --code-dot-red: #f16d67;
  --code-dot-yellow: #e7b04c;
  --code-dot-green: #53c583;

  --tok-comment: #6f7f95;
  --tok-string: #9ece6a;
  --tok-keyword: #bb9af7;
  --tok-number: #ff9e64;
  --tok-builtin: #7dcfff;
  --tok-function: #7aa2f7;
  --tok-property: #7dcfff;
  --tok-operator: #89ddff;
  --tok-punctuation: #9aa8ba;
  --tok-tag: #f7768e;
  --tok-attr: #ffc777;
  --tok-variable: #c0caf5;
  --tok-flag: #e0af68;
  --tok-atrule: #bb9af7;
  --tok-important: #f7768e;
  --tok-color: #e0af68;
  --tok-selector: #7aa2f7;
  --tok-decorator: #e0af68;
  --tok-key: #7dcfff;
  --tok-anchor: #e0af68;
  --tok-hunk: #2ac3de;
  --tok-added: #9ece6a;
  --tok-added-bg: rgba(158, 206, 106, 0.08);
  --tok-removed: #f7768e;
  --tok-removed-bg: rgba(247, 118, 142, 0.08);
  --tok-meta: #6f7f95;

  --mark-bg: rgba(250, 204, 21, 0.28);
  --mark-text: #fde68a;

  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 16px 44px -22px rgba(0, 0, 0, 0.75);
  --shadow-lg: 0 36px 90px -30px rgba(0, 0, 0, 0.85);

  color-scheme: dark;
}

/* ------------------------------------------------------------------ *
 * 2. 基础重置
 * ------------------------------------------------------------------ */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  scroll-padding-top: 92px;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: var(--font-sans);
  font-size: 15.5px;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
}

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

button {
  font-family: inherit;
  font-size: inherit;
  color: inherit;
}

img {
  max-width: 100%;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: 700;
  color: var(--text);
}

::selection {
  background: var(--accent-soft);
  color: var(--accent-ink);
}

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
    border-radius: 4px;
}

[hidden] {
  display: none !important;
}

.muted {
  color: var(--text-3);
}

.noscript {
  margin: 0;
  padding: 12px 20px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: 13px;
  text-align: center;
}

.icon {
  width: 18px;
  height: 18px;
  flex: none;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 8px 14px;
  border-radius: 8px;
  background: var(--accent);
  color: #fff;
  font-size: 13px;
  transform: translateY(-200%);
  transition: transform 0.18s ease;
}

.skip-link:focus {
  transform: none;
}

svg symbol {
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

/* ------------------------------------------------------------------ *
 * 3. 布局骨架
 * ------------------------------------------------------------------ */

.app {
  display: grid;
  grid-template-columns: var(--sidebar-w) minmax(0, 1fr);
  min-height: 100vh;
  transition: grid-template-columns 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

.page {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 100vh;
}

main {
  flex: 1;
  min-width: 0;
}

.progress {
  position: fixed;
  top: 0;
  left: var(--sidebar-w);
  right: 0;
  height: 2px;
  z-index: 90;
  pointer-events: none;
  transition: left 0.28s cubic-bezier(0.22, 1, 0.36, 1);
}

#progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #14b8a6);
}

/* ------------------------------------------------------------------ *
 * 4. 侧边栏
 * ------------------------------------------------------------------ */

.sidebar {
  position: sticky;
  top: 0;
  height: 100vh;
  overflow: hidden;
  background: var(--bg-sidebar);
  border-right: 1px solid var(--border);
  z-index: 60;
  transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.18s ease,
    visibility 0s linear 0s;
}

.sidebar-inner {
  display: flex;
  flex-direction: column;
  height: 100%;
  padding: 22px 16px 16px;
  overflow: hidden;
}

.sidebar-head {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 2px 2px 0 8px;
  margin-bottom: 16px;
}

.brand {
  display: flex;
  flex: 1;
  align-items: center;
  gap: 11px;
  min-width: 0;
  padding: 0;
  margin: 0;
}

.sidebar-collapse {
  display: grid;
  place-items: center;
  flex: none;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 0;
  border-radius: 7px;
  background: transparent;
  color: var(--text-3);
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}

.sidebar-collapse:hover {
  background: rgba(27, 34, 43, 0.06);
  color: var(--text);
}

[data-theme="dark"] .sidebar-collapse:hover {
  background: rgba(255, 255, 255, 0.06);
}

.sidebar-collapse .icon {
  width: 16px;
  height: 16px;
}

.sidebar-expand {
  position: fixed;
  top: 26px;
  left: 0;
  z-index: 75;
  display: none;
  place-items: center;
  width: 32px;
  height: 42px;
  padding: 0;
  border: 1px solid var(--border);
  border-left: 0;
  border-radius: 0 9px 9px 0;
  background: var(--surface);
  color: var(--text-2);
  box-shadow: var(--shadow-md);
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.sidebar-expand:hover {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent);
}

.sidebar-expand .icon {
  width: 16px;
  height: 16px;
  transform: rotate(180deg);
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: none;
  border-radius: 10px;
  background: linear-gradient(145deg, #0f766e 0%, #0d9488 55%, #14b8a6 100%);
  box-shadow: 0 8px 18px -8px rgba(15, 118, 110, 0.65);
}

.brand-mark svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: #ffffff;
  stroke-width: 2;
  stroke-linecap: round;
}

.brand-mark-sm {
  width: 27px;
  height: 27px;
  border-radius: 8px;
  box-shadow: none;
}

.brand-mark-sm svg {
  width: 15px;
  height: 15px;
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.2;
  min-width: 0;
}

.brand-text strong {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.brand-text small {
  font-size: 10.5px;
  font-weight: 500;
  letter-spacing: 0.12em;
  color: var(--text-3);
  margin-top: 2px;
}

.search-trigger {
  display: flex;
  align-items: center;
  gap: 9px;
  width: 100%;
  padding: 9px 11px;
  margin-bottom: 6px;
  border: 1px solid var(--border);
  border-radius: 10px;
  background: var(--surface);
  color: var(--text-3);
  font-size: 13px;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--shadow-sm);
  transition: border-color 0.16s ease, color 0.16s ease, box-shadow 0.16s ease;
}

.search-trigger:hover {
  border-color: var(--accent-line);
  color: var(--text-2);
  box-shadow: var(--shadow-md);
}

.search-trigger .icon {
  width: 16px;
  height: 16px;
  color: var(--text-3);
}

.search-trigger .key-hint {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 10px;
  padding: 2px 6px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--text-3);
}

.side-nav {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow-y: auto;
  margin: 0 -6px;
  padding: 2px 6px 12px;
  scrollbar-width: thin;
}

.side-label {
  margin: 14px 10px 5px;
  font-size: 10.5px;
  font-weight: 600;
  letter-spacing: 0.13em;
  text-transform: uppercase;
  color: var(--text-3);
}

.side-link {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border-radius: 8px;
  font-size: 13.5px;
  color: var(--text-2);
  transition: background 0.15s ease, color 0.15s ease;
}

.side-link .icon {
  width: 16px;
  height: 16px;
  color: var(--text-3);
}

.side-link:hover {
  background: rgba(27, 34, 43, 0.05);
  color: var(--text);
}

[data-theme="dark"] .side-link:hover {
  background: rgba(255, 255, 255, 0.05);
}

.side-link.active {
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-weight: 600;
}

.side-link.active .icon {
  color: var(--accent);
}

.side-group {
  margin-top: 2px;
}

.side-group-head {
  display: flex;
  align-items: center;
  gap: 6px;
  width: 100%;
  padding: 6px 10px 6px 6px;
  border: 0;
  border-radius: 7px;
  background: none;
  color: var(--text-3);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.04em;
  cursor: pointer;
  transition: color 0.15s ease, background 0.15s ease;
}

.side-group-head:hover {
  color: var(--text-2);
  background: rgba(27, 34, 43, 0.04);
}

[data-theme="dark"] .side-group-head:hover {
  background: rgba(255, 255, 255, 0.04);
}

.side-group-head .chevron {
  width: 13px;
  height: 13px;
  transition: transform 0.2s ease;
}

.side-group.collapsed .chevron {
  transform: rotate(-90deg);
}

.side-group.collapsed .side-items {
  display: none;
}

.side-group.is-active .side-group-head {
  color: var(--accent);
}

.side-group-name {
  flex: 1;
  text-align: left;
}

.side-count {
  font-family: var(--font-mono);
  font-size: 10px;
  font-weight: 400;
  padding: 1px 6px;
  border-radius: 20px;
  color: var(--text-3);
  background: rgba(27, 34, 43, 0.05);
}

[data-theme="dark"] .side-count {
  background: rgba(255, 255, 255, 0.06);
}

.side-items {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 2px 0 4px;
}

.side-item {
  position: relative;
  display: block;
  padding: 5px 9px 5px 28px;
  border-radius: 7px;
  font-size: 12.6px;
  line-height: 1.5;
  color: var(--text-2);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: background 0.15s ease, color 0.15s ease;
}

.side-item::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 50%;
  width: 4px;
  height: 4px;
  border-radius: 50%;
  background: var(--border-strong);
  transform: translateY(-50%);
  transition: background 0.15s ease;
}

.side-item:hover {
  background: rgba(27, 34, 43, 0.05);
  color: var(--text);
}

[data-theme="dark"] .side-item:hover {
  background: rgba(255, 255, 255, 0.05);
}

.side-item.active {
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-weight: 600;
}

.side-item.active::before {
  background: var(--accent);
}

.sidebar-foot {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.theme-btn {
  display: flex;
  align-items: center;
  gap: 9px;
  padding: 7px 10px;
  border: 0;
  border-radius: 8px;
  background: none;
  color: var(--text-3);
  font-size: 12.5px;
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.theme-btn:hover {
  background: rgba(27, 34, 43, 0.05);
  color: var(--text-2);
}

[data-theme="dark"] .theme-btn:hover {
  background: rgba(255, 255, 255, 0.05);
}

.theme-btn .icon {
  width: 15px;
  height: 15px;
}

[data-theme="light"] .icon-sun,
[data-theme="dark"] .icon-moon {
  display: none;
}

.scrim {
  position: fixed;
  inset: 0;
  z-index: 55;
  background: rgba(14, 19, 25, 0.46);
  opacity: 0;
  visibility: hidden;
  transition: opacity 0.2s ease, visibility 0.2s ease;
  backdrop-filter: blur(2px);
}

body.nav-open .scrim {
  opacity: 1;
  visibility: visible;
}

body.nav-open {
  overflow: hidden;
}

/* ------------------------------------------------------------------ *
 * 5. 顶部栏（仅移动端）
 * ------------------------------------------------------------------ */

.topbar {
  display: none;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  border: 0;
  border-radius: 9px;
  background: none;
  color: var(--text-2);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.icon-btn:hover {
  background: var(--surface-2);
  color: var(--text);
}

.icon-btn .icon {
  width: 19px;
  height: 19px;
}

/* ------------------------------------------------------------------ *
 * 6. 首页
 * ------------------------------------------------------------------ */

.home {
  max-width: 1120px;
  margin: 0 auto;
  padding: 62px 56px 84px;
}

.hero {
  position: relative;
  padding: 20px 0 10px;
}

.hero h1 {
  margin: 18px 0 20px;
  font-size: clamp(2.1rem, 4.1vw, 3.05rem);
  font-weight: 800;
  line-height: 1.22;
  letter-spacing: -0.035em;
}

.hero h1 .accent {
  color: var(--accent);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 5px 12px;
  border: 1px solid var(--accent-line);
  border-radius: 99px;
  background: var(--accent-soft);
  color: var(--accent-ink);
  font-size: 11.5px;
  font-weight: 600;
  letter-spacing: 0.03em;
}

.pulse {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.hero-lead {
  max-width: 58ch;
  margin: 0 0 30px;
  color: var(--text-2);
  font-size: 16px;
  line-height: 1.85;
}

.hero-search {
  display: flex;
  align-items: center;
  gap: 12px;
  width: min(570px, 100%);
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  color: var(--text-3);
  font-size: 14.5px;
  text-align: left;
  cursor: pointer;
  box-shadow: var(--shadow-md);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.hero-search:hover {
  transform: translateY(-1px);
  border-color: var(--accent-line);
  box-shadow: 0 20px 46px -24px var(--accent-line);
}

.hero-search .icon {
  width: 18px;
  height: 18px;
  color: var(--accent);
}

.hero-search kbd {
  margin-left: auto;
}

.hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 34px;
  margin-top: 36px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}

.stat {
  display: flex;
  flex-direction: column;
  gap: 1px;
}

.stat strong {
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.stat span {
  font-size: 11px;
  letter-spacing: 0.05em;
  color: var(--text-3);
}

.section {
  margin-top: 62px;
}

.section-head {
  display: flex;
  align-items: flex-end;
  justify-content: space-between;
  gap: 20px;
  margin-bottom: 22px;
}

.section-head h2 {
  margin: 0 0 4px;
  font-size: 21px;
  letter-spacing: -0.02em;
}

.section-head p {
  margin: 0;
  font-size: 13px;
  color: var(--text-3);
}

.text-link {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 12.5px;
  font-weight: 500;
  color: var(--accent);
  white-space: nowrap;
}

.text-link .icon {
  width: 14px;
  height: 14px;
}

.text-link:hover {
  color: var(--accent-strong);
}

.cat-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
}

.cat-card {
  display: flex;
  flex-direction: column;
  padding: 22px 22px 18px;
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: transform 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.cat-card:hover {
  transform: translateY(-3px);
  border-color: var(--border-strong);
  box-shadow: var(--shadow-md);
}

.cat-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 15px;
}

.cat-icon {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 11px;
  color: var(--cat);
  background: rgba(127, 127, 127, 0.08);
  background: color-mix(in srgb, var(--cat) 11%, transparent);
}

.cat-icon .icon {
  width: 20px;
  height: 20px;
}

.cat-count {
  padding: 3px 9px;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--surface-2);
  font-size: 11px;
  color: var(--text-3);
}

.cat-card h3 {
  margin: 0 0 6px;
  font-size: 17px;
  letter-spacing: -0.01em;
}

.cat-card h3 a:hover {
  color: var(--cat);
}

.cat-desc {
  margin: 0 0 16px;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--text-3);
}

.cat-docs {
  display: flex;
  flex-direction: column;
  gap: 1px;
  margin: 0 0 16px;
  padding: 10px 0 0;
  border-top: 1px solid var(--border);
  list-style: none;
}

.cat-docs a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding: 5px 5px;
  border-radius: 6px;
  font-size: 12.5px;
  color: var(--text-2);
}

.cat-docs a:hover {
  background: var(--accent-soft);
  color: var(--accent-ink);
}

.cat-doc-title {
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.cat-doc-arrow {
  color: var(--text-3);
  opacity: 0;
  transform: translateX(-3px);
  transition: opacity 0.16s ease, transform 0.16s ease;
}

.cat-docs a:hover .cat-doc-arrow {
  opacity: 1;
  transform: none;
}

.cat-link {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  margin-top: auto;
  font-size: 12px;
  font-weight: 600;
  color: var(--cat);
}

.cat-link .icon {
  width: 14px;
  height: 14px;
  transition: transform 0.18s ease;
}

.cat-link:hover .icon {
  transform: translateX(3px);
}

.tag-cloud {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--border);
  border-radius: 99px;
  background: var(--surface);
  color: var(--text-2);
  font-size: 12px;
  line-height: 1.5;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.tag:hover {
  border-color: var(--accent-line);
  background: var(--accent-soft);
  color: var(--accent-ink);
}

.tag-lg {
  padding: 7px 14px;
  font-size: 13px;
}

.tag-count {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--text-3);
}

.tag:hover .tag-count {
  color: var(--accent);
}

/* ------------------------------------------------------------------ *
 * 7. 文档页
 * ------------------------------------------------------------------ */

.doc-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: start;
  gap: clamp(24px, 2vw, 44px);
  max-width: none;
  margin: 0 auto;
  padding: 44px clamp(16px, 1.8vw, 24px) 96px;
}

.doc {
  justify-self: center;
  width: 100%;
  max-width: 1080px;
  min-width: 0;
  animation: doc-in 0.35s ease both;
}

@keyframes doc-in {
  from {
    transform: translateY(6px);
  }
  to {
    transform: none;
  }
}

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 7px;
  margin-bottom: 24px;
  font-size: 12px;
  color: var(--text-3);
}

.crumbs a {
  color: var(--text-3);
  transition: color 0.15s ease;
}

.crumbs a:hover {
  color: var(--accent);
}

.crumb-sep {
  color: var(--border-strong);
}

.crumbs [aria-current] {
  max-width: 46ch;
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
  color: var(--text-2);
}

.doc-header {
  margin-bottom: 36px;
}

.doc-header h1 {
  margin: 0 0 14px;
  font-size: clamp(1.9rem, 3.2vw, 2.4rem);
  font-weight: 800;
  line-height: 1.26;
  letter-spacing: -0.032em;
}

.doc-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 18px;
  padding-bottom: 20px;
  border-bottom: 1px solid var(--border);
  font-size: 12px;
  color: var(--text-3);
}

.meta-item {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.meta-item .icon {
  width: 14px;
  height: 14px;
}

.doc-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  margin-left: auto;
}

.doc-tags .tag {
  padding: 2px 8px;
  border: 0;
  background: var(--surface-2);
  font-size: 11px;
}

/* 正文排版 */

.doc-body {
  font-size: 16px;
  line-height: 1.9;
  color: var(--text);
  overflow-wrap: break-word;
}

.doc-body > p:first-child {
  margin-top: 0;
}

.doc-body p {
  margin: 0 0 1.15em;
}

.doc-body h2 {
  position: relative;
  margin: 2.4em 0 0.75em;
  padding-bottom: 0.42em;
  border-bottom: 1px solid var(--border);
  font-size: 1.45rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  scroll-margin-top: 100px;
}

.doc-body h3 {
  margin: 1.9em 0 0.55em;
  font-size: 1.12rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  scroll-margin-top: 100px;
}

.doc-body h4 {
  margin: 1.6em 0 0.4em;
  font-size: 1rem;
  font-weight: 650;
}

.doc-body h2:first-child,
.doc-body h3:first-child {
  margin-top: 0;
}

.heading-anchor {
  display: inline-block;
  margin-left: 10px;
  color: var(--text-3) !important;
  font-weight: 400;
  font-size: 0.8em;
  opacity: 0;
  vertical-align: middle;
  transition: opacity 0.15s ease, color 0.15s ease;
}

.doc-body h2:hover .heading-anchor,
.doc-body h3:hover .heading-anchor,
.heading-anchor:focus-visible {
  opacity: 1;
}

.heading-anchor:hover {
  color: var(--accent) !important;
}

.doc-body a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-color: var(--accent-line);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
  transition: text-decoration-color 0.15s ease, color 0.15s ease;
}

.doc-body a:hover {
  color: var(--accent-strong);
  text-decoration-color: var(--accent);
}

.doc-body strong {
  font-weight: 650;
}

.doc-body ul,
.doc-body ol {
  margin: 0 0 1.2em;
  padding-left: 1.4em;
}

.doc-body li {
  margin: 0.35em 0;
}

.doc-body li > ul,
.doc-body li > ol {
  margin: 0.25em 0 0.15em;
}

.doc-body hr {
  height: 1px;
  margin: 2.4em 0;
  border: 0;
  background: var(--border);
}

.doc-body img {
  height: auto;
  margin: 1.4em 0;
  border-radius: 10px;
}

.doc-body .img-wrap {
  margin: 1.5em 0;
}

.doc-body .img-wrap img {
  display: block;
  margin: 0;
}

/* 图片下方仅含斜体的段落，作为居中的图注 */
.doc-body p > em:only-child {
  display: block;
  margin-top: -0.5em;
  color: var(--text-3);
  font-size: 12.5px;
  font-style: normal;
  text-align: center;
}

.doc-body code {
  padding: 0.12em 0.38em;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--accent-ink);
  font-family: var(--font-mono);
  font-size: 0.86em;
  white-space: break-spaces;
}

.doc-body pre code {
  padding: 0;
  border: 0;
  background: none;
  color: inherit;
  font-size: inherit;
  white-space: pre;
}

.doc-body blockquote {
  margin: 1.5em 0;
  padding: 2px 0 2px 18px;
  border-left: 3px solid var(--border-strong);
  color: var(--text-2);
}

.doc-body blockquote p {
  margin: 0.4em 0;
}

/* 表格 */

.table-wrap {
  margin: 1.5em 0;
  overflow-x: auto;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
}

.table-wrap table {
  width: 100%;
  border-collapse: collapse;
  font-size: 13.5px;
  line-height: 1.65;
}

.table-wrap th {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-2);
  font-weight: 600;
  white-space: nowrap;
}

.table-wrap td {
  padding: 10px 14px;
  border-bottom: 1px solid var(--border);
  color: var(--text-2);
  vertical-align: top;
}

.table-wrap tr:last-child td {
  border-bottom: 0;
}

.table-wrap tbody tr:hover {
  background: var(--surface-2);
}

.table-wrap code {
  font-size: 0.86em;
}

/* 提示块 */

.callout {
  display: flex;
  gap: 12px;
  margin: 1.6em 0;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  font-size: 14.5px;
  line-height: 1.75;
}

.callout-icon {
  flex: none;
  color: var(--text-3);
}

.callout-icon svg {
  width: 20px;
  height: 20px;
  margin-top: 2px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.callout-main {
  min-width: 0;
}

.callout-title {
  margin: 0 0 4px !important;
  font-size: 13px;
  font-weight: 650;
  letter-spacing: 0.03em;
}

.callout-body p {
  margin: 0.25em 0;
}

.callout-body p:last-child {
  margin-bottom: 0;
}

.callout-note {
  border-color: rgba(37, 99, 235, 0.22);
  background: rgba(37, 99, 235, 0.055);
}

.callout-note .callout-icon,
.callout-note .callout-title {
  color: #2563eb;
}

.callout-tip {
  border-color: rgba(5, 150, 105, 0.22);
  background: rgba(5, 150, 105, 0.06);
}

.callout-tip .callout-icon,
.callout-tip .callout-title {
  color: #059669;
}

.callout-important {
  border-color: rgba(124, 58, 237, 0.22);
  background: rgba(124, 58, 237, 0.055);
}

.callout-important .callout-icon,
.callout-important .callout-title {
  color: #7c3aed;
}

.callout-warning {
  border-color: rgba(217, 119, 6, 0.24);
  background: rgba(217, 119, 6, 0.065);
}

.callout-warning .callout-icon,
.callout-warning .callout-title {
  color: #b45309;
}

.callout-caution {
  border-color: rgba(220, 38, 38, 0.22);
  background: rgba(220, 38, 38, 0.055);
}

.callout-caution .callout-icon,
.callout-caution .callout-title {
  color: #dc2626;
}

[data-theme="dark"] .callout-note {
  background: rgba(96, 165, 250, 0.08);
  border-color: rgba(96, 165, 250, 0.22);
}

[data-theme="dark"] .callout-note .callout-icon,
[data-theme="dark"] .callout-note .callout-title {
  color: #93c5fd;
}

[data-theme="dark"] .callout-tip {
  background: rgba(52, 211, 153, 0.08);
  border-color: rgba(52, 211, 153, 0.22);
}

[data-theme="dark"] .callout-tip .callout-icon,
[data-theme="dark"] .callout-tip .callout-title {
  color: #6ee7b7;
}

[data-theme="dark"] .callout-important {
  background: rgba(167, 139, 250, 0.08);
  border-color: rgba(167, 139, 250, 0.22);
}

[data-theme="dark"] .callout-important .callout-icon,
[data-theme="dark"] .callout-important .callout-title {
  color: #c4b5fd;
}

[data-theme="dark"] .callout-warning {
  background: rgba(251, 191, 36, 0.08);
  border-color: rgba(251, 191, 36, 0.22);
}

[data-theme="dark"] .callout-warning .callout-icon,
[data-theme="dark"] .callout-warning .callout-title {
  color: #fcd34d;
}

[data-theme="dark"] .callout-caution {
  background: rgba(248, 113, 113, 0.08);
  border-color: rgba(248, 113, 113, 0.22);
}

[data-theme="dark"] .callout-caution .callout-icon,
[data-theme="dark"] .callout-caution .callout-title {
  color: #fca5a5;
}

/* 代码块 */

.code-block {
  margin: 1.6em 0;
  border: 1px solid var(--code-border);
  border-radius: 12px;
  overflow: hidden;
  background: var(--code-bg);
  box-shadow: var(--code-shadow);
}

.code-head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border-bottom: 1px solid var(--code-border);
  background: var(--code-head);
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--code-head-text);
}

.code-dots {
  display: inline-flex;
  gap: 5px;
}

.code-dots i {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--code-dot);
}

.code-dots i:nth-child(1) {
  background: var(--code-dot-red);
}

.code-dots i:nth-child(2) {
  background: var(--code-dot-yellow);
}

.code-dots i:nth-child(3) {
  background: var(--code-dot-green);
}

.code-lang {
  font-weight: 600;
  color: var(--code-lang);
  letter-spacing: 0.02em;
}

.code-title {
  padding-left: 10px;
  border-left: 1px solid var(--code-border);
  color: var(--code-title);
  overflow: hidden;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.code-copy,
.code-wrap {
  flex: none;
  padding: 3px 9px;
  border: 1px solid var(--code-copy-border);
  border-radius: 6px;
  background: transparent;
  color: var(--code-copy-text);
  font-family: var(--font-sans);
  font-size: 10.5px;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease, background 0.15s ease;
}

.code-wrap {
  margin-left: auto;
}

.code-copy {
  margin-left: auto;
}

.code-wrap + .code-copy {
  margin-left: 0;
}

.code-copy:hover,
.code-wrap:hover {
  border-color: var(--code-copy-hover-border);
  color: var(--code-copy-hover-text);
}

.code-wrap[aria-pressed="true"] {
  border-color: color-mix(in srgb, var(--accent) 45%, transparent);
  background: var(--accent-soft);
  color: var(--accent-ink);
}

.code-copy.copied {
  border-color: color-mix(in srgb, var(--code-success) 45%, transparent);
  color: var(--code-success);
}

.code-block pre {
  margin: 0;
  padding: 16px 18px;
  overflow-x: auto;
  color: var(--code-text);
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.65;
  tab-size: 2;
}

.code-block.is-wrap pre {
  overflow-x: hidden;
  white-space: pre-wrap;
  overflow-wrap: anywhere;
  word-break: break-word;
}

.code-block.is-wrap pre code {
  white-space: pre-wrap;
}

/* 纯文本块常用于 ASCII 示意图，收紧行高让制表符连线更连续 */
.code-block[data-lang="text"] pre {
  line-height: 1.3;
}

.code-block pre::-webkit-scrollbar {
  height: 8px;
}

.code-block pre::-webkit-scrollbar-thumb {
  border-radius: 8px;
  background: var(--code-scroll);
}

/* 语法高亮配色（浅色主题） */

.tok-comment {
  color: var(--tok-comment);
  font-style: italic;
}
.tok-string {
  color: var(--tok-string);
}
.tok-keyword {
  color: var(--tok-keyword);
}
.tok-number,
.tok-boolean {
  color: var(--tok-number);
}
.tok-builtin {
  color: var(--tok-builtin);
}
.tok-function {
  color: var(--tok-function);
}
.tok-property {
  color: var(--tok-property);
}
.tok-operator {
  color: var(--tok-operator);
}
.tok-punctuation {
  color: var(--tok-punctuation);
}
.tok-tag {
  color: var(--tok-tag);
}
.tok-attr {
  color: var(--tok-attr);
}
.tok-variable {
  color: var(--tok-variable);
}
.tok-flag {
  color: var(--tok-flag);
}
.tok-atrule {
  color: var(--tok-atrule);
}
.tok-important {
  color: var(--tok-important);
}
.tok-color {
  color: var(--tok-color);
}
.tok-selector {
  color: var(--tok-selector);
}
.tok-decorator {
  color: var(--tok-decorator);
}
.tok-key {
  color: var(--tok-key);
}
.tok-anchor {
  color: var(--tok-anchor);
}
.tok-hunk {
  color: var(--tok-hunk);
}
.tok-added {
  color: var(--tok-added);
  background: var(--tok-added-bg);
}
.tok-removed {
  color: var(--tok-removed);
  background: var(--tok-removed-bg);
}
.tok-meta {
  color: var(--tok-meta);
}

/* 任务列表 */

.task-item {
  list-style: none;
}

.task-label {
  display: flex;
  align-items: flex-start;
  gap: 8px;
}

.task-check {
  appearance: none;
  -webkit-appearance: none;
  position: relative;
  flex: none;
  width: 15px;
  height: 15px;
  margin-top: 0.38em;
  border: 1.5px solid var(--border-strong);
  border-radius: 4px;
  background: var(--surface);
  cursor: default;
}

.task-check:checked {
  border-color: var(--accent);
  background: var(--accent);
}

.task-check:checked::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1px;
  width: 4px;
  height: 8px;
  border: solid #ffffff;
  border-width: 0 1.5px 1.5px 0;
  transform: rotate(45deg);
}

/* 上一篇 / 下一篇 */

.pager {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
  margin-top: 58px;
  padding-top: 26px;
  border-top: 1px solid var(--border);
}

.pager-link {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.pager-link:hover {
  transform: translateY(-1px);
  border-color: var(--accent-line);
  box-shadow: var(--shadow-md);
}

.pager-next {
  align-items: flex-end;
  text-align: right;
}

.pager-dir {
  display: inline-flex;
  align-items: center;
  gap: 5px;
  font-size: 11px;
  color: var(--text-3);
}

.pager-dir .icon {
  width: 13px;
  height: 13px;
}

.pager-title {
  font-size: 13.5px;
  font-weight: 600;
  line-height: 1.5;
}

.pager-empty {
  border: 0;
  background: none;
  pointer-events: none;
}

/* 目录 */

.toc {
  position: sticky;
  top: 40px;
  align-self: start;
  justify-self: end;
  width: max-content;
  min-width: 180px;
  max-width: 300px;
  max-height: calc(100vh - 80px);
  overflow-y: auto;
  padding: 4px 0 20px;
  font-size: 12.5px;
}

.toc-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px 18px;
}

.toc-title {
  margin: 0;
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--text-3);
}

.toc-collapse {
  flex: none;
  margin-left: auto;
  padding: 2px 7px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: none;
  color: var(--text-3);
  font-size: 10px;
  line-height: 1.5;
  cursor: pointer;
  transition: color 0.15s ease, border-color 0.15s ease;
}

.toc-collapse:hover {
  border-color: var(--accent-line);
  color: var(--accent);
}

.toc.is-collapsed {
  width: 44px;
  min-width: 44px;
  max-width: 44px;
  overflow: visible;
}

.toc.is-collapsed .toc-head {
  justify-content: center;
  margin-left: 0;
}

.toc.is-collapsed .toc-title,
.toc.is-collapsed .toc-list {
  display: none;
}

.toc.is-collapsed .toc-collapse {
  width: 100%;
  margin-left: 0;
  padding: 6px 0;
}

.toc-list,
.toc-children {
  margin: 0;
  padding: 0;
  list-style: none;
}

.toc > .toc-list {
  border-left: 1.5px solid var(--border);
}

.toc-children {
  margin-left: 9px;
  border-left: 1.5px solid var(--border);
}

.toc-row {
  display: flex;
  align-items: flex-start;
  margin-left: -1.5px;
  border-left: 2px solid transparent;
}

.toc-row.active {
  border-left-color: var(--accent);
}

.toc-row a {
  flex: 1;
  min-width: 0;
  padding: 5px 0 5px 2px;
  color: var(--text-3);
  line-height: 1.5;
  transition: color 0.15s ease;
}

.toc-row a:hover {
  color: var(--text);
}

.toc-row a.active {
  color: var(--accent);
  font-weight: 600;
}

.toc-item.toc-1 > .toc-row a {
  color: var(--text-2);
  font-weight: 600;
  font-size: 13px;
}

.toc-item.toc-3 > .toc-row a {
  font-size: 12px;
}

.toc-fold {
  flex: none;
  display: grid;
  place-items: center;
  width: 16px;
  height: 20px;
  margin-top: 2px;
  padding: 0;
  border: 0;
  background: none;
  color: var(--text-3);
  cursor: pointer;
}

.toc-fold .icon {
  width: 12px;
  height: 12px;
  transition: transform 0.15s ease;
}

.toc-fold:hover {
  color: var(--accent);
}

.toc-item.is-collapsed > .toc-row .toc-fold .icon {
  transform: rotate(-90deg);
}

.toc-item.is-collapsed > .toc-children {
  display: none;
}

.toc-fold.is-empty {
  visibility: hidden;
}

/* ------------------------------------------------------------------ *
 * 8. 分类 / 标签列表页
 * ------------------------------------------------------------------ */

.listing {
  max-width: 1060px;
  margin: 0 auto;
  padding: 50px 56px 96px;
}

.page-header {
  margin-bottom: 34px;
}

.page-icon {
  display: inline-grid;
  place-items: center;
  width: 46px;
  height: 46px;
  margin-bottom: 16px;
  border-radius: 13px;
  background: rgba(127, 127, 127, 0.08);
  background: color-mix(in srgb, var(--cat, var(--accent)) 12%, transparent);
  color: var(--cat, var(--accent));
}

.page-icon .icon {
  width: 22px;
  height: 22px;
}

.page-header h1 {
  margin: 0 0 10px;
  font-size: clamp(1.9rem, 3vw, 2.4rem);
  letter-spacing: -0.03em;
}

.page-desc {
  margin: 0 0 8px;
  color: var(--text-2);
  font-size: 15px;
}

.page-count {
  margin: 0;
  color: var(--text-3);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
}

.doc-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
}

.doc-card {
  position: relative;
  display: flex;
  flex-direction: column;
  padding: 20px;
  border: 1px solid var(--border);
  border-radius: 14px;
  background: var(--surface);
  box-shadow: var(--shadow-sm);
  transition: transform 0.18s ease, border-color 0.18s ease, box-shadow 0.18s ease;
}

.doc-card-hit {
  position: absolute;
  inset: 0;
  z-index: 1;
  border-radius: inherit;
}

.doc-card:hover {
  transform: translateY(-2px);
  border-color: var(--accent-line);
  box-shadow: var(--shadow-md);
}

.doc-card-top {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 12px;
  font-size: 11px;
  color: var(--text-3);
}

.doc-card-cat {
  font-weight: 600;
  color: var(--cat);
}

.doc-card time {
  font-family: var(--font-mono);
}

.doc-card h2 {
  margin: 0 0 8px;
  font-size: 16px;
  line-height: 1.45;
  letter-spacing: -0.01em;
}

.doc-card:hover h2 {
  color: var(--accent);
}

.doc-card-title {
  outline-offset: 4px;
}

.doc-card-summary {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  margin: 0 0 16px;
  color: var(--text-3);
  font-size: 12.5px;
  line-height: 1.75;
}

.doc-card-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  margin-top: auto;
  padding-top: 12px;
  border-top: 1px solid var(--border);
}

.doc-card-tags {
  position: relative;
  z-index: 2;
  display: flex;
  flex-wrap: wrap;
  gap: 5px;
  overflow: hidden;
  max-height: 24px;
}

.doc-card-tags .tag {
  padding: 2px 7px;
  border: 0;
  background: var(--surface-2);
  font-size: 10.5px;
}

.doc-card-time {
  color: var(--text-3);
  font-size: 10.5px;
  white-space: nowrap;
}

.tag-cloud-page {
  gap: 10px;
}

.all-group {
  margin-top: 42px;
}

.all-group-head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--border);
}

.all-group-head h2 {
  margin: 0;
  font-size: 17px;
  letter-spacing: -0.01em;
  color: var(--cat);
}

.all-group-count {
  font-size: 11px;
  color: var(--text-3);
}

/* ------------------------------------------------------------------ *
 * 9. 404
 * ------------------------------------------------------------------ */

.notfound {
  max-width: 620px;
  margin: 0 auto;
  padding: 110px 40px;
  text-align: center;
}

.notfound-code {
  margin: 0;
  color: var(--accent);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.28em;
}

.notfound h1 {
  margin: 14px 0 12px;
  font-size: 2rem;
  letter-spacing: -0.03em;
}

.notfound-actions {
  display: flex;
  justify-content: center;
  gap: 12px;
  margin-top: 28px;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 16px;
  border: 1px solid var(--border);
  border-radius: 9px;
  background: var(--surface);
  color: var(--text-2);
  font-size: 13px;
  cursor: pointer;
  transition: border-color 0.15s ease, color 0.15s ease;
}

.btn:hover {
  border-color: var(--accent-line);
  color: var(--accent);
}

.btn-primary {
  border-color: var(--accent);
  background: var(--accent);
  color: #ffffff;
}

.btn-primary:hover {
  border-color: var(--accent-strong);
  background: var(--accent-strong);
  color: #ffffff;
}

.btn .icon {
  width: 15px;
  height: 15px;
}

/* ------------------------------------------------------------------ *
 * 10. 页脚
 * ------------------------------------------------------------------ */

.site-footer {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 10px 24px;
  width: 100%;
  max-width: 1160px;
  margin: 0 auto;
  padding: 26px 56px 34px;
  border-top: 1px solid var(--border);
  font-size: 11.5px;
  color: var(--text-3);
}

.site-footer p {
  margin: 0;
}

.footer-note {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.02em;
}

.visit-count {
  display: inline-flex;
  align-items: center;
  gap: 6px;
}

.visit-count::before {
  content: "";
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--accent);
  opacity: 0.65;
}

.visit-count strong {
  color: var(--text-2);
  font-weight: 600;
  font-variant-numeric: tabular-nums;
}

/* ------------------------------------------------------------------ *
 * 11. 搜索
 * ------------------------------------------------------------------ */

.search-modal {
  position: fixed;
  inset: 0;
  z-index: 130;
  display: flex;
  justify-content: center;
  align-items: flex-start;
  padding: 11vh 20px 40px;
}

.search-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(11, 15, 20, 0.44);
  backdrop-filter: blur(6px);
  opacity: 0;
  transition: opacity 0.18s ease;
}

.search-modal.open .search-backdrop {
  opacity: 1;
}

.search-panel {
  position: relative;
  display: flex;
  flex-direction: column;
  width: min(680px, 100%);
  max-height: 78vh;
  overflow: hidden;
  border: 1px solid var(--border);
  border-radius: 16px;
  background: var(--surface);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  transform: translateY(-8px) scale(0.985);
  transition: opacity 0.18s ease, transform 0.18s ease;
}

.search-modal.open .search-panel {
  opacity: 1;
  transform: none;
}

.search-bar {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
}

.search-bar .icon {
  width: 19px;
  height: 19px;
  color: var(--text-3);
}

.search-bar input {
  flex: 1;
  min-width: 0;
  border: 0;
  outline: 0;
  background: transparent;
  color: var(--text);
  font-family: inherit;
  font-size: 15.5px;
}

.search-bar input::placeholder {
  color: var(--text-3);
}

.search-bar input::-webkit-search-cancel-button {
  display: none;
}

.search-esc {
  flex: none;
  padding: 3px 7px;
  border: 1px solid var(--border);
  border-radius: 5px;
  background: var(--surface-2);
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 10px;
  cursor: pointer;
}

.search-body {
  min-height: 140px;
  overflow-y: auto;
  padding: 10px;
}

.search-count {
  padding: 6px 10px 8px;
  color: var(--text-3);
  font-size: 10.5px;
  letter-spacing: 0.03em;
}

.search-result {
  display: block;
  padding: 10px 12px;
  border: 1px solid transparent;
  border-radius: 10px;
}

.search-result:hover,
.search-result.active {
  border-color: var(--accent-line);
  background: var(--accent-soft);
}

.search-result-head {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 4px;
}

.search-cat {
  flex: none;
  padding: 1px 7px;
  border-radius: 4px;
  background: rgba(127, 127, 127, 0.1);
  background: color-mix(in srgb, var(--cat) 12%, transparent);
  color: var(--cat);
  font-size: 9.5px;
  font-weight: 600;
}

.search-result-title {
  overflow: hidden;
  color: var(--text);
  font-size: 13.5px;
  font-weight: 600;
  white-space: nowrap;
  text-overflow: ellipsis;
}

.search-snippet {
  display: -webkit-box;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
  overflow: hidden;
  margin: 0;
  color: var(--text-3);
  font-size: 12px;
  line-height: 1.7;
}

mark {
  padding: 0 1px;
  border-radius: 2px;
  background: var(--mark-bg);
  color: var(--mark-text);
}

.search-empty {
  padding: 38px 20px;
  text-align: center;
  color: var(--text-2);
}

.search-empty .empty-icon {
  width: 30px;
  height: 30px;
  margin-bottom: 10px;
  color: var(--text-3);
}

.search-empty p {
  margin: 6px 0;
  font-size: 13.5px;
}

.search-empty .muted {
  font-size: 12px;
}

.search-hint {
  padding: 8px 8px 14px;
}

.search-hint-label {
  margin: 8px 4px;
  color: var(--text-3);
  font-size: 10px;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.quick-list {
  display: flex;
  flex-direction: column;
}

.quick-item {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 10px;
  border-radius: 8px;
  color: var(--text-2);
  font-size: 13px;
}

.quick-item:hover {
  background: var(--surface-2);
  color: var(--text);
}

.quick-cat {
  flex: none;
  color: var(--cat);
  font-size: 9.5px;
  font-weight: 600;
}

.quick-arrow {
  width: 14px;
  height: 14px;
  margin-left: auto;
  color: var(--text-3);
  opacity: 0;
}

.quick-item:hover .quick-arrow {
  opacity: 1;
}

.search-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 7px;
  padding: 4px;
}

.search-foot {
  display: flex;
  gap: 18px;
  padding: 10px 16px;
  border-top: 1px solid var(--border);
  background: var(--surface-2);
  color: var(--text-3);
  font-size: 10.5px;
}

.search-foot span {
  display: inline-flex;
  align-items: center;
  gap: 5px;
}

kbd {
  padding: 1px 5px;
  border: 1px solid var(--border);
  border-radius: 4px;
  background: var(--surface);
  box-shadow: 0 1px 0 var(--border);
  color: var(--text-3);
  font-family: var(--font-mono);
  font-size: 10px;
}

body.modal-open {
  overflow: hidden;
}

/* ------------------------------------------------------------------ *
 * 14. 侧边栏折叠（仅桌面端）
 * ------------------------------------------------------------------ */

@media (min-width: 901px) {
  html.nav-collapsed .app {
    grid-template-columns: 0 minmax(0, 1fr);
  }

  html.nav-collapsed .sidebar {
    transform: translateX(-100%);
    opacity: 0;
    visibility: hidden;
    transition: transform 0.28s cubic-bezier(0.22, 1, 0.36, 1), opacity 0.18s ease,
      visibility 0s linear 0.28s;
  }

  html.nav-collapsed .progress {
    left: 0;
  }

  html.nav-collapsed .sidebar-expand {
    display: grid;
  }
}

/* ------------------------------------------------------------------ *
 * 15. 响应式
 * ------------------------------------------------------------------ */

@media (max-width: 1180px) {
  .home {
    padding: 52px 40px 76px;
  }

  .doc-grid {
    grid-template-columns: minmax(0, 1fr);
    gap: 0;
    max-width: 960px;
    padding: 40px 32px 88px;
  }

  /* 窄屏下目录直接放在正文之后 */
  .toc {
    display: block;
    position: static;
    justify-self: stretch;
    width: auto;
    min-width: 0;
    max-width: none;
    max-height: none;
    margin-top: 40px;
    padding: 22px 0 0;
    border-top: 1px solid var(--border);
    overflow: visible;
  }

  /* 窄屏收起时保留标题，只隐藏目录列表 */
  .toc.is-collapsed {
    width: auto;
    min-width: 0;
    max-width: none;
  }

  .toc.is-collapsed .toc-head {
    justify-content: space-between;
    margin-left: 18px;
  }

  .toc.is-collapsed .toc-title {
    display: block;
  }

  .toc.is-collapsed .toc-collapse {
    width: auto;
    margin-left: auto;
    padding: 2px 7px;
  }

  .listing {
    padding: 44px 40px 88px;
  }

  .site-footer {
    padding: 24px 40px 30px;
  }
}

@media (max-width: 900px) {
  .app {
    display: block;
  }

  .progress {
    left: 0;
    top: 55px;
  }

  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: min(320px, 86vw);
    height: 100%;
    transform: translateX(-102%);
    transition: transform 0.26s cubic-bezier(0.22, 1, 0.36, 1);
    box-shadow: var(--shadow-lg);
  }

  body.nav-open .sidebar {
    transform: none;
  }

  .topbar {
    position: sticky;
    top: 0;
    z-index: 45;
    display: flex;
    align-items: center;
    gap: 10px;
    height: 56px;
    padding: 0 12px;
    border-bottom: 1px solid var(--border);
    background: var(--bg);
    background: color-mix(in srgb, var(--bg) 88%, transparent);
    backdrop-filter: blur(12px);
  }

  .topbar-brand {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: 14px;
    letter-spacing: -0.01em;
  }

  .topbar-actions {
    display: flex;
    gap: 2px;
    margin-left: auto;
  }

  .search-trigger .key-hint {
    display: none;
  }

  .sidebar-collapse,
  .sidebar-expand {
    display: none;
  }

  .home {
    padding: 30px 20px 64px;
  }

  .hero h1 {
    font-size: clamp(1.9rem, 8vw, 2.4rem);
    margin: 16px 0 16px;
  }

  .hero-lead {
    font-size: 14.5px;
  }

  .hero-stats {
    gap: 20px 30px;
    margin-top: 28px;
    padding-top: 22px;
  }

  .doc-grid {
    padding: 26px 20px 60px;
  }

  .doc-header h1 {
    font-size: clamp(1.7rem, 6.5vw, 2rem);
  }

  .listing {
    padding: 26px 20px 64px;
  }

  .cat-grid,
  .doc-cards {
    grid-template-columns: 1fr;
  }

  .doc-meta {
    gap: 8px 14px;
  }

  .doc-tags {
    width: 100%;
    margin-left: 0;
  }

  .pager {
    grid-template-columns: 1fr;
    margin-top: 44px;
  }

  .pager-empty {
    display: none;
  }

  .search-modal {
    padding: 8vh 12px 20px;
  }

  .search-panel {
    max-height: 82vh;
  }

  .site-footer {
    flex-direction: column;
    gap: 6px;
    padding: 22px 20px 30px;
  }

  .notfound {
    padding: 80px 24px;
  }
}

@media (max-width: 760px) {
  /* 流程图等 SVG 在窄屏下保持最小可读宽度，横向滑动查看 */
  .doc-body .img-wrap-svg {
    overflow-x: auto;
    padding-bottom: 6px;
    scrollbar-width: thin;
  }

  .doc-body .img-wrap-svg::before {
    content: "← 横向滑动查看完整图表 →";
    display: block;
    margin-bottom: 8px;
    color: var(--text-3);
    font-size: 10.5px;
    letter-spacing: 0.02em;
    text-align: center;
  }

  .doc-body .img-wrap-svg img {
    min-width: 620px;
    max-width: none;
  }
}

@media (max-width: 560px) {
  .home {
    padding-top: 24px;
  }

  .section {
    margin-top: 46px;
  }

  .section-head {
    align-items: flex-start;
    flex-direction: column;
    gap: 8px;
  }

  .hero-search {
    padding: 12px 14px;
    font-size: 13.5px;
  }

  .hero-search .key-hint,
  .hero-search kbd {
    display: none;
  }

  .hero-stats {
    gap: 16px 26px;
  }

  .stat strong {
    font-size: 18px;
  }

  .doc-body {
    font-size: 15.5px;
    line-height: 1.85;
  }

  .doc-body h2 {
    font-size: 1.3rem;
  }

  .doc-meta {
    font-size: 11.5px;
  }

  .search-foot {
    gap: 12px;
    font-size: 10px;
  }

  .search-foot span:nth-child(2) {
    display: none;
  }
}

/* ------------------------------------------------------------------ *
 * 16. 动效可访问性 & 打印
 * ------------------------------------------------------------------ */

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
}

@media print {
  .sidebar,
  .topbar,
  .toc,
  .progress,
  .pager,
  .site-footer,
  .search-modal,
  .heading-anchor {
    display: none !important;
  }

  .app {
    display: block;
  }

  .doc-grid {
    display: block;
    padding: 0;
  }

  body {
    background: #ffffff;
    color: #000000;
    font-size: 12pt;
  }

  .code-block {
    break-inside: avoid;
  }
}