/* ============================================================
   style.css — Zig Language Reference
   Inspired by tailwindcss.com docs design system (Tailwind v4)
   Design tokens: oklch colors, .25rem spacing grid, Inter font
   ============================================================ */

/* ── Design Tokens (CSS Custom Properties) ───────────────── */

:root {
  /* Fonts */
  --font-sans: 'Inter', system-ui, -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'IBM Plex Mono', ui-monospace, monospace;

  /* Spacing scale (base .25rem = 4px) */
  --spacing: 0.25rem;
  --size-0: 0px;
  --size-px: 1px;
  --size-0_5: calc(var(--spacing) * 0.5);
  --size-1: calc(var(--spacing) * 1);
  --size-1_5: calc(var(--spacing) * 1.5);
  --size-2: calc(var(--spacing) * 2);
  --size-2_5: calc(var(--spacing) * 2.5);
  --size-3: calc(var(--spacing) * 3);
  --size-3_5: calc(var(--spacing) * 3.5);
  --size-4: calc(var(--spacing) * 4);
  --size-5: calc(var(--spacing) * 5);
  --size-6: calc(var(--spacing) * 6);
  --size-7: calc(var(--spacing) * 7);
  --size-8: calc(var(--spacing) * 8);
  --size-9: calc(var(--spacing) * 9);
  --size-10: calc(var(--spacing) * 10);
  --size-12: calc(var(--spacing) * 12);
  --size-14: calc(var(--spacing) * 14);
  --size-16: calc(var(--spacing) * 16);
  --size-20: calc(var(--spacing) * 20);
  --size-24: calc(var(--spacing) * 24);
  --size-28: calc(var(--spacing) * 28);
  --size-32: calc(var(--spacing) * 32);
  --size-36: calc(var(--spacing) * 36);
  --size-40: calc(var(--spacing) * 40);
  --size-44: calc(var(--spacing) * 44);
  --size-48: calc(var(--spacing) * 48);
  --size-52: calc(var(--spacing) * 52);
  --size-56: calc(var(--spacing) * 56);
  --size-60: calc(var(--spacing) * 60);
  --size-64: calc(var(--spacing) * 64);
  --size-72: calc(var(--spacing) * 72);
  --size-80: calc(var(--spacing) * 80);
  --size-96: calc(var(--spacing) * 96);

  /* Container widths */
  --container-3xs: 16rem;
  --container-2xs: 18rem;
  --container-xs: 20rem;
  --container-sm: 24rem;
  --container-md: 28rem;
  --container-lg: 32rem;
  --container-xl: 36rem;
  --container-2xl: 42rem;
  --container-3xl: 48rem;
  --container-4xl: 56rem;
  --container-5xl: 64rem;
  --container-6xl: 72rem;
  --container-7xl: 80rem;

  /* Breakpoints (for reference, used in media queries) */
  --breakpoint-sm: 40rem;
  --breakpoint-md: 48rem;
  --breakpoint-lg: 64rem;
  --breakpoint-xl: 80rem;
  --breakpoint-2xl: 96rem;

  /* ── Color Palette: Tailwind v4 OKLCH gray scale ── */
  --color-white: oklch(1 0 0);
  --color-black: oklch(0 0 0);
  --color-gray-50: oklch(0.985 0.002 247.839);
  --color-gray-100: oklch(0.967 0.003 264.542);
  --color-gray-200: oklch(0.928 0.006 264.531);
  --color-gray-300: oklch(0.872 0.01 258.338);
  --color-gray-400: oklch(0.707 0.022 261.325);
  --color-gray-500: oklch(0.551 0.027 264.364);
  --color-gray-600: oklch(0.446 0.03 256.802);
  --color-gray-700: oklch(0.373 0.034 259.733);
  --color-gray-800: oklch(0.278 0.033 256.848);
  --color-gray-900: oklch(0.21 0.034 264.665);
  --color-gray-950: oklch(0.13 0.028 261.692);

  /* ── Accent (Olive) ── */
  --color-sky-300: #b5c489;       /* olive-300 */
  --color-sky-400: #a9bd6e;       /* olive-400 */
  --color-sky-500: #728a42;       /* olive-500 */
  --color-sky-600: #5f7432;       /* olive-600 */
  --color-sky-700: #556b26;       /* olive-700 */
  --color-sky-800: #4f6420;       /* olive-800 */

  /* ── Syntax highlighting ── */
  --color-syntax-keyword: #b45309;       /* orange-700 */
  --color-syntax-string: #728a42;        /* olive-500 */
  --color-syntax-builtin: #5f7432;       /* olive-600 */
  --color-syntax-comment: #9ca3af;       /* gray-400 */
  --color-syntax-function: #334155;      /* slate-700 */
  --color-syntax-null: #d97706;          /* amber-600 */
  --color-syntax-number: #d97706;        /* amber-600 */
  --color-syntax-type: #556b26;          /* olive-700 */

  /* ── Prose (content) variables ── */
  --prose-color: var(--color-gray-700);
  --prose-heading-color: var(--color-gray-950);
  --prose-strong-color: var(--color-gray-950);
  --prose-link-color: var(--color-gray-950);
  --prose-link-underline-color: var(--color-sky-500);
  --prose-code-color: var(--color-gray-950);
  --prose-code-bg: color-mix(in oklch, var(--color-gray-950) 4%, transparent);
  --prose-blockquote-border: var(--color-gray-300);
  --prose-hr-color: color-mix(in oklch, var(--color-gray-950) 6%, transparent);
  --prose-th-borders: var(--color-gray-300);
  --prose-td-borders: var(--color-gray-200);

  /* ── Layout ── */
  --nav-width: var(--container-2xs);
  --nav-margin-l: 1em;
  --gutter-width: 2.5rem;
  --top-bar-height: 3.5rem;
}

/* ── Dark Theme ──────────────────────────────────────── */

@media (prefers-color-scheme: dark) {
  :root {
    --color-white: oklch(0.13 0.028 261.692);
    --color-black: oklch(1 0 0);
    --color-gray-50: oklch(0.13 0.028 261.692);
    --color-gray-100: oklch(0.16 0.028 264.665);
    --color-gray-200: oklch(0.21 0.034 264.665);
    --color-gray-300: oklch(0.278 0.033 256.848);
    --color-gray-400: oklch(0.446 0.03 256.802);
    --color-gray-500: oklch(0.551 0.027 264.364);
    --color-gray-600: oklch(0.707 0.022 261.325);
    --color-gray-700: oklch(0.872 0.01 258.338);
    --color-gray-800: oklch(0.928 0.006 264.531);
    --color-gray-900: oklch(0.967 0.003 264.542);
    --color-gray-950: oklch(0.985 0.002 247.839);

    --color-syntax-keyword: #f7a41e;       /* orange-500 */
    --color-syntax-string: #a9bd6e;        /* olive-400 */
    --color-syntax-builtin: #97a571;       /* olive-400 */
    --color-syntax-comment: #6b7280;       /* gray-500 */
    --color-syntax-function: #cbd5e1;      /* slate-300 */
    --color-syntax-null: #fcd34d;          /* amber-300 */
    --color-syntax-number: #fcd34d;        /* amber-300 */
    --color-syntax-type: #8f9d6c;          /* olive-500 */

    --prose-color: var(--color-gray-600);
    --prose-heading-color: var(--color-gray-900);
    --prose-strong-color: var(--color-gray-900);
    --prose-link-color: var(--color-gray-900);
    --prose-link-underline-color: var(--color-sky-400);
    --prose-code-color: var(--color-gray-900);
    --prose-code-bg: color-mix(in oklch, var(--color-gray-950) 10%, transparent);
    --prose-blockquote-border: var(--color-gray-400);
    --prose-hr-color: color-mix(in oklch, var(--color-gray-950) 12%, transparent);
    --prose-th-borders: var(--color-gray-400);
    --prose-td-borders: var(--color-gray-300);
  }
}

[data-theme='dark'] {
  --color-white: oklch(0.13 0.028 261.692);
  --color-black: oklch(1 0 0);
  --color-gray-50: oklch(0.13 0.028 261.692);
  --color-gray-100: oklch(0.16 0.028 264.665);
  --color-gray-200: oklch(0.21 0.034 264.665);
  --color-gray-300: oklch(0.278 0.033 256.848);
  --color-gray-400: oklch(0.446 0.03 256.802);
  --color-gray-500: oklch(0.551 0.027 264.364);
  --color-gray-600: oklch(0.707 0.022 261.325);
  --color-gray-700: oklch(0.872 0.01 258.338);
  --color-gray-800: oklch(0.928 0.006 264.531);
  --color-gray-900: oklch(0.967 0.003 264.542);
  --color-gray-950: oklch(0.985 0.002 247.839);

  --color-syntax-keyword: #f7a41e;       /* orange-500 */
  --color-syntax-string: #a9bd6e;        /* olive-400 */
  --color-syntax-builtin: #97a571;       /* olive-400 */
  --color-syntax-comment: #6b7280;       /* gray-500 */
  --color-syntax-function: #cbd5e1;      /* slate-300 */
  --color-syntax-null: #fcd34d;          /* amber-300 */
  --color-syntax-number: #fcd34d;        /* amber-300 */
  --color-syntax-type: #8f9d6c;          /* olive-500 */

  --prose-color: var(--color-gray-600);
  --prose-heading-color: var(--color-gray-900);
  --prose-strong-color: var(--color-gray-900);
  --prose-link-color: var(--color-gray-900);
  --prose-link-underline-color: var(--color-sky-400);
  --prose-code-color: var(--color-gray-900);
  --prose-code-bg: color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  --prose-blockquote-border: var(--color-gray-400);
  --prose-hr-color: color-mix(in oklch, var(--color-gray-950) 12%, transparent);
  --prose-th-borders: var(--color-gray-400);
  --prose-td-borders: var(--color-gray-300);
}

/* ── Base / Reset ─────────────────────────────────────── */

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

html {
  -webkit-text-size-adjust: 100%;
  -moz-text-size-adjust: 100%;
  text-size-adjust: 100%;
  tab-size: 4;
  line-height: 1.5;
  font-family: var(--font-sans);
  -webkit-tap-highlight-color: transparent;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding-top: var(--top-bar-height);
  font-family: var(--font-sans);
  color: var(--prose-color);
  background: var(--color-white);
  line-height: 1.6;
}

@media (prefers-color-scheme: dark) {
  body {
    background: var(--color-gray-50);
    color: var(--prose-color);
  }
}

[data-theme='dark'] body,
body.dark {
  background: var(--color-gray-50);
  color: var(--prose-color);
}

/* ── Typography ───────────────────────────────────────── */

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-sans);
  font-weight: 700;
  color: var(--prose-heading-color);
  line-height: 1.3;
  scroll-margin-top: 2rem;
}

h1 { font-size: 2.25rem; margin: 0 0 1rem; }
h2 { font-size: 1.5rem; margin: 2rem 0 0.75rem; padding-bottom: 0.25rem; border-bottom: 1px solid var(--prose-hr-color); }
h3 { font-size: 1.25rem; margin: 64px 0 0.5rem; }
h4 { font-size: 1.1rem; margin: 1.25rem 0 0.5rem; }
h5 { font-size: 1rem; margin: 1rem 0 0.5rem; }
h6 { font-size: 0.9rem; margin: 1rem 0 0.5rem; }

h1 a, h2 a, h3 a, h4 a, h5 a, h6 a {
  text-decoration: none;
  color: inherit;
}

a.hdr {
  visibility: hidden;
  font-size: 0.85em;
  color: var(--color-gray-400);
  text-decoration: none;
  margin-left: 0.25rem;
  font-weight: 400;
}

h1:hover > a.hdr,
h2:hover > a.hdr,
h3:hover > a.hdr,
h4:hover > a.hdr,
h5:hover > a.hdr,
h6:hover > a.hdr {
  visibility: visible;
}

a.hdr:hover {
  color: var(--color-gray-950);
}

p {
  margin: 0.75em 0;
  line-height: 1.75;
}

strong {
  font-weight: 600;
  color: var(--prose-strong-color);
}

/* ── Links ────────────────────────────────────────────── */

#contents a {
  color: var(--prose-link-color);
  font-weight: 700;
  text-underline-offset: 3px;
  text-decoration: underline;
  text-decoration-color: color-mix(in oklch, var(--prose-link-underline-color) 30%, transparent);
  text-decoration-thickness: 2px;
  transition: color 0.15s ease, text-decoration-color 0.15s ease;
}

#contents a:hover {
  text-decoration-color: color-mix(in oklch, var(--prose-link-underline-color) 70%, transparent);
}

@media (prefers-color-scheme: dark) {
  #contents a {
    text-decoration-color: color-mix(in oklch, var(--prose-link-underline-color) 30%, transparent);
  }
  #contents a:hover {
    text-decoration-color: color-mix(in oklch, var(--prose-link-underline-color) 70%, transparent);
  }
}

/* ── Layout: Top Navigation Bar ────────────────────────── */

#top-bar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 50;
  height: var(--top-bar-height);
  background: color-mix(in oklch, var(--color-white) 85%, transparent);
  backdrop-filter: blur(12px);
  -webkit-backdrop-filter: blur(12px);
  border-bottom: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  padding: 0;
  font-family: var(--font-sans);
}

@media (prefers-color-scheme: dark) {
  #top-bar {
    background: color-mix(in oklch, var(--color-gray-50) 85%, transparent);
    border-bottom-color: color-mix(in oklch, var(--color-gray-950) 12%, transparent);
  }
}

[data-theme='dark'] #top-bar {
  background: color-mix(in oklch, var(--color-gray-50) 85%, transparent);
  border-bottom-color: color-mix(in oklch, var(--color-gray-950) 12%, transparent);
}

.top-bar-inner {
  display: flex;
  align-items: center;
  justify-content: flex-start;
  height: 100%;
  padding: 0 var(--size-4);
  max-width: 100%;
  position: relative;
}

.top-bar-start {
  display: flex;
  align-items: center;
  gap: var(--size-2);
  padding-left: 0;
}

.top-bar-end {
  display: flex;
  align-items: center;
  gap: var(--size-2);
  padding-right: 0;
  margin-left: auto;
}

.top-bar-title {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: 0.9375rem;
  font-weight: 500;
  color: var(--prose-heading-color);
  letter-spacing: -0.01em;
  padding: 0 var(--size-3);
  margin-left: var(--size-1);
  min-width: 0;
  /* 极窄时标题盒可被压缩到小于 Logo 内容: 裁切而非溢出叠到版本下拉上 */
  overflow: hidden;
}

/* 标题文字内层 span: 承担省略号截断 (flex 容器自身不生效 text-overflow,
   需 block container 才吃到省略号, 否则窄屏硬裁切) */
.top-bar-title-text {
  display: block;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  min-width: 0;
}

.top-bar-logo {
  flex-shrink: 0;
  width: 1.25rem;
  height: auto;
  display: block;
}

@media (prefers-color-scheme: dark) {
  .top-bar-logo {
    filter: brightness(1.4);
  }
}

@media screen and (min-width: 64rem) {
  /* Title and start/end items flow naturally in the flex layout.
     Align with content area padding on desktop. */
  .top-bar-inner {
    padding: 0 var(--size-8);
  }
  .top-bar-title {
    padding: 0 var(--size-2);
    margin-left: 0;
  }
}

@media (prefers-color-scheme: dark) {
  .top-bar-title {
    color: var(--color-gray-900);
  }
}

.top-bar-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  border: none;
  border-radius: 0.375rem;
  background: transparent;
  color: var(--color-gray-600);
  cursor: pointer;
  transition: background 0.15s ease, color 0.15s ease;
}

.top-bar-btn:hover {
  background: color-mix(in oklch, var(--color-gray-950) 5%, transparent);
  color: var(--color-gray-950);
}

.top-bar-btn:focus-visible {
  outline: 2px solid var(--color-sky-500);
  outline-offset: 2px;
}

/* ── Search Toggle: Capsule Shape ─────────────────────── */

.search-toggle-btn {
  display: inline-flex;
  align-items: center;
  width: auto;
  gap: var(--size-1);
  border-radius: 9999px;
  border: none;
  padding: var(--size-1) var(--size-2);
  font-family: var(--font-sans);
  font-size: 0.75rem;
  line-height: 1;
  background: color-mix(in oklch, var(--color-gray-950) 2%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in oklch, var(--color-gray-950) 8%, transparent);
  color: var(--color-gray-600);
  cursor: pointer;
  transition: background 0.15s ease, box-shadow 0.15s ease, color 0.15s ease;
}

.search-toggle-btn svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
  margin-left: -0.125rem;
  fill: var(--color-gray-600);
}

.search-toggle-btn:hover {
  background: color-mix(in oklch, var(--color-gray-950) 4%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in oklch, var(--color-gray-950) 16%, transparent);
}

.search-toggle-btn:focus-visible {
  outline: 2px solid var(--color-sky-500);
  outline-offset: 2px;
}

.search-toggle-kbd {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-sans);
  font-size: 0.6875rem;
  font-weight: 500;
  line-height: 1;
  color: var(--color-gray-500);
  letter-spacing: -0.01em;
}

/* 窄屏隐藏 ⌘K 提示, 搜索按钮退化为纯圆形图标, 给顶栏标题让位 */
@media screen and (max-width: 30rem) {
  .search-toggle-kbd {
    display: none;
  }

  .search-toggle-btn {
    width: 2rem;
    height: 2rem;
    padding: 0;
    justify-content: center;
  }

  .search-toggle-btn svg {
    margin-left: 0;
  }
}

@media (prefers-color-scheme: dark) {
  .search-toggle-btn {
    background: color-mix(in oklch, var(--color-white) 5%, transparent);
    box-shadow: inset 0 0 0 1px color-mix(in oklch, var(--color-white) 2%, transparent);
    color: var(--color-gray-500);
  }

  .search-toggle-btn svg {
    fill: var(--color-gray-500);
  }

  .search-toggle-btn:hover {
    background: color-mix(in oklch, var(--color-white) 8%, transparent);
    box-shadow: inset 0 0 0 1px color-mix(in oklch, var(--color-white) 5%, transparent);
  }

  .search-toggle-kbd {
    color: var(--color-gray-400);
  }
}

@media (prefers-color-scheme: dark) {
  .top-bar-btn {
    color: var(--color-gray-500);
  }
  .top-bar-btn:hover {
    background: color-mix(in oklch, var(--color-gray-950) 12%, transparent);
    color: var(--color-gray-900);
  }
}

/* ── Layout: Grid ─────────────────────────────────────── */

@media screen and (min-width: 64rem) {
  body {
    display: grid;
    grid-template-columns:
      var(--nav-width)
      var(--gutter-width)
      minmax(0, 1fr);
    grid-template-rows: 1fr;
    min-height: 100dvh;
  }

  #main-wrapper {
    grid-column: 1 / -1;
    grid-row: 1;
    display: grid;
    grid-template-columns: subgrid;
    /* Clip the sidebar when it slides out */
    overflow-x: clip;
  }

  #navigation {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: 0;
    height: 100dvh;
    overflow-y: auto;
    padding: 0 var(--size-6) var(--size-6);
    padding-top: var(--top-bar-height);
    /* Border removed — handled by gutter separator */
    background: var(--color-gray-50);
    transition: transform 0.25s ease;
    z-index: 1;
    /* Default collapsed — no JS flash */
    transform: translateX(-100%);
  }

  #navigation.sidebar-expanded {
    transform: translateX(0);
  }

  #navigation.sidebar-collapsed {
    transform: translateX(-100%);
  }

  /* Hide left gutter when sidebar collapsed */
  body.sidebar-collapsed #main-wrapper::before {
    opacity: 0;
  }

  #contents-wrapper {
    grid-column: 1 / -1;
    grid-row: 1;
    min-width: 0;
    padding: var(--size-8) var(--size-8) var(--size-16);
    padding-left: calc(var(--nav-width) + var(--gutter-width));
    transition: padding-left 0.25s ease;
  }

  body.sidebar-collapsed #contents-wrapper {
    padding-left: var(--size-8);
  }

  #contents {
    max-width: 1050px;
    margin: 0 20px 0 20px;
  }
}

@media (prefers-color-scheme: dark) {
  @media screen and (min-width: 64rem) {
    #navigation {
      background: var(--color-gray-100);
    }
  }

  @media screen and (min-width: 60em) {
    #page-toc {
      border-right-color: color-mix(in oklch, var(--color-gray-950) 12%, transparent);
    }
    #contents-wrapper:not(.has-page-toc) #contents {
      border-right-color: color-mix(in oklch, var(--color-gray-950) 12%, transparent);
    }
  }
}

/* ── Layout: Mobile / Narrow ──────────────────────────── */

@media screen and (max-width: 63.999rem) {
  body {
    padding-top: var(--top-bar-height);
  }

  #navigation {
    position: fixed;
    top: var(--top-bar-height);
    left: 0;
    bottom: 0;
    z-index: 40;
    width: var(--nav-width);
    max-width: 85vw;
    padding: 0 var(--size-4) var(--size-6);
    background: var(--color-gray-50);
    border-right: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
    overflow-y: auto;
    transform: translateX(-100%);
    transition: transform 0.25s ease, opacity 0.2s ease;
    opacity: 0;
  }

  #navigation.sidebar-open {
    transform: translateX(0);
    opacity: 1;
  }

  #contents-wrapper {
    padding: 0 var(--size-4);
  }

  #contents {
    padding: 0;
  }
}

@media (max-width: 63.999rem) and (prefers-color-scheme: dark) {
  #navigation {
    background: var(--color-gray-100);
    border-right-color: color-mix(in oklch, var(--color-gray-950) 15%, transparent);
  }
}

/* ── Top Bar: Version Selector ──────────────────────────── */

/* 下拉令牌: 灰色阶变量在日夜间反转, 同一组定义自动适配两种模式 */
.pretty-dropdown {
  --dd-bg: var(--color-white);
  --dd-fg: var(--color-gray-700);
  --dd-border: color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  --dd-muted-fg: var(--color-gray-500);
  --dd-accent: color-mix(in oklch, var(--color-gray-950) 4%, transparent);
  --dd-accent-fg: var(--color-gray-950);
  --dd-current-fg: var(--color-gray-950);
  --dd-ring: var(--color-sky-500);
  --dd-shadow: 0 10px 30px rgba(15, 23, 42, 0.08), 0 0 0 1px rgba(15, 23, 42, 0.04);
  --dd-radius: 8px;
  --dd-trigger-bg: color-mix(in oklch, var(--color-gray-950) 2%, transparent);
  --dd-trigger-fg: var(--color-gray-600);
}

@media (prefers-color-scheme: dark) {
  .pretty-dropdown {
    --dd-ring: var(--color-sky-400);
    --dd-shadow: 0 10px 30px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.06);
  }
}

[data-theme='dark'] .pretty-dropdown {
  --dd-ring: var(--color-sky-400);
  --dd-shadow: 0 10px 30px rgba(0, 0, 0, 0.45), 0 0 0 1px rgba(255, 255, 255, 0.06);
}

.top-bar-version {
  display: inline-flex;
  align-items: center;
  gap: 2px;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  line-height: 1;
  padding: 0 var(--size-2);
  /* 与标题/Logo 及搜索按钮保持间距; 不参与压缩, 避免被挤扁后与相邻元素重叠 */
  margin: 0 var(--size-2);
  flex-shrink: 0;
  height: 2rem;
}

.top-bar-version:hover {
  border-color: color-mix(in oklch, var(--color-gray-950) 25%, transparent);
}

.top-bar-version .pretty-dropdown-chevron {
  width: 0.875rem;
  height: 0.875rem;
}

/* 版本标签: 单行不换行, 与 chevron 分离承载文本 */
.top-bar-version-label {
  white-space: nowrap;
  line-height: 1;
}


[data-theme='dark'] .search-toggle-btn {
  background: color-mix(in oklch, var(--color-white) 5%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in oklch, var(--color-white) 2%, transparent);
  color: var(--color-gray-500);
}
[data-theme='dark'] .search-toggle-btn svg {
  fill: var(--color-gray-500);
}
[data-theme='dark'] .search-toggle-btn:hover {
  background: color-mix(in oklch, var(--color-white) 8%, transparent);
  box-shadow: inset 0 0 0 1px color-mix(in oklch, var(--color-white) 5%, transparent);
}
[data-theme='dark'] .search-toggle-kbd {
  color: var(--color-gray-400);
}

/* ── Sidebar: TOC ─────────────────────────────────────── */

#navigation nav:last-of-type h2 {
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-gray-500);
  margin: var(--size-3) 0 var(--size-3);
  padding: 0;
  border: none;
}

#navigation nav:last-of-type ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0;
}

#navigation nav:last-of-type ul ul {
  display: none;
}

#navigation nav:last-of-type a {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.5;
  padding: var(--size-1) var(--size-2);
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color 0.15s ease, border-color 0.15s ease;
  border-left: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
}

#navigation nav:last-of-type a:hover {
  color: var(--color-gray-700);
  border-left-color: var(--color-gray-400);
  text-decoration: none;
}

#navigation nav:last-of-type a.active {
  color: var(--color-gray-950);
  border-left-color: var(--color-gray-950);
  font-weight: 500;
}

@media (prefers-color-scheme: dark) {
  #navigation nav:last-of-type a {
    color: var(--color-gray-500);
    border-left-color: color-mix(in oklch, var(--color-gray-950) 20%, transparent);
  }

  #navigation nav:last-of-type a:hover {
    color: var(--color-gray-700);
    border-left-color: var(--color-gray-500);
  }

  #navigation nav:last-of-type a.active {
    color: var(--color-gray-900);
    border-left-color: var(--color-gray-950);
  }
}

/* ── Page TOC (On this page — right sidebar) ──────────── */

#page-toc {
  display: none;
}

/* ── Page TOC: Right sidebar on screens >= 60em ──────── */

@media screen and (min-width: 60em) {
  #contents-wrapper {
    display: flex;
    flex-direction: row;
    align-items: flex-start;
    gap: 2.5rem;
  }

  #contents {
    flex: 0 1 auto;
    min-width: 0;
    margin: 0 20px 0 20px;
    max-width: 1050px;
    padding: 0 var(--size-8);
  }

  /* Center the content group as a whole (with or without page TOC) */
  #contents-wrapper.has-page-toc,
  #contents-wrapper:not(.has-page-toc) {
    justify-content: center;
  }

  #contents-wrapper.has-page-toc #contents {
    flex: 1 1 auto;
    margin: 0 20px 0 20px;
    min-width: 0;
    max-width: 1050px;
  }

  /* Right separator on page TOC */
  #page-toc {
    display: block;
    width: 12rem;
    min-width: 12rem;
    flex-shrink: 0;
    order: 1;
  }

  /* Right separator on contents when no page TOC */
  #contents-wrapper:not(.has-page-toc) #contents {
    border-right: 1px solid color-mix(in oklch, var(--color-gray-950) 5%, transparent);
  }

  /* Hide right separators when sidebar collapsed */
  body.sidebar-collapsed #page-toc,
  body.sidebar-collapsed #contents-wrapper:not(.has-page-toc) #contents {
    border-right-color: transparent;
  }

  #page-toc {
    position: sticky;
    top: calc(var(--top-bar-height) + 1.5rem);
    max-height: calc(100vh - var(--top-bar-height) - 3rem);
    overflow-y: auto;
    overscroll-behavior: contain;
    scrollbar-width: thin;
    scrollbar-color: transparent transparent;
    transition: scrollbar-color 0.15s ease;
  }

  #page-toc:hover {
    scrollbar-color: color-mix(in oklch, var(--color-gray-950) 15%, transparent) transparent;
  }

  #page-toc::-webkit-scrollbar {
    width: 4px;
  }

  #page-toc::-webkit-scrollbar-track {
    background: transparent;
  }

  #page-toc::-webkit-scrollbar-thumb {
    background: transparent;
    border-radius: 2px;
  }

  #page-toc:hover::-webkit-scrollbar-thumb {
    background: color-mix(in oklch, var(--color-gray-950) 15%, transparent);
  }
}

/* ── Page TOC: Mobile (< 60em, shared dropdown) ──────── */

/* 移动端下拉目录: 桌面端隐藏, 移动端由媒体查询显示 */
.pretty-page-toc-mobile {
  display: none;
}

@media screen and (max-width: 59.999em) {
  /* 桌面右侧栏在移动端隐藏, 由共享下拉形式的移动目录接管 */
  #page-toc {
    display: none;
  }

  .pretty-page-toc-mobile {
    display: block;
    margin-top: var(--size-6);
    margin-bottom: var(--size-6);
  }

  /* 全宽条 trigger: 视觉延续原折叠卡片 */
  .pretty-page-toc-mobile-trigger {
    display: flex;
    width: 100%;
    min-height: 2.75rem;
    justify-content: space-between;
    padding: 0 var(--size-4);
    border-color: color-mix(in oklch, var(--color-gray-950) 10%, transparent);
    border-radius: 0.5rem;
    background: var(--color-gray-50);
    color: var(--color-gray-950);
    font-size: 0.875rem;
    font-weight: 600;
  }

  /* 面板贴内容宽度; 高度约束与面板内滚动由共享引擎接管 (面板视口溢出) */
  .pretty-page-toc-mobile-panel {
    width: 100%;
    max-width: none;
  }
}

@media screen and (max-width: 59.999em) and (prefers-color-scheme: dark) {
  .pretty-page-toc-mobile-trigger {
    background: var(--color-gray-100);
    border-color: color-mix(in oklch, var(--color-gray-950) 15%, transparent);
  }
}

/* ── Page TOC: Both desktop & mobile shared visual styles ── */

#page-toc-header {
  display: flex;
  align-items: center;
  gap: var(--size-2);
  margin-bottom: var(--size-3);
}

#page-toc h3 {
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--color-gray-400);
  margin: 0;
  padding: 0;
  border: none;
  font-family: var(--font-mono);
}

/* Page TOC links */
#page-toc ul {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
}

#page-toc li {
  margin: 0;
}

#page-toc a {
  display: block;
  padding: var(--size-1) var(--size-3);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--color-gray-400);
  text-decoration: none;
  border-left: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  margin-left: 0;
  transition: color 0.15s ease, border-color 0.15s ease;
  border-radius: 0;
  word-break: break-word;
}

#page-toc a:hover {
  color: var(--color-gray-700);
  border-left-color: var(--color-gray-400);
  text-decoration: none;
}

#page-toc a.active {
  color: var(--color-gray-950);
  border-left-color: var(--color-gray-950);
  font-weight: 500;
}

@media (prefers-color-scheme: dark) {
  #page-toc h3 {
    color: var(--color-gray-500);
  }

  #page-toc a {
    color: var(--color-gray-500);
    border-left-color: color-mix(in oklch, var(--color-gray-950) 20%, transparent);
  }

  #page-toc a:hover {
    color: var(--color-gray-700);
    border-left-color: var(--color-gray-500);
  }

  #page-toc a.active {
    color: var(--color-gray-900);
    border-left-color: var(--color-gray-950);
  }

  /* Desktop hover scrollbar */
  @media screen and (min-width: 60em) {
    #page-toc:hover {
      scrollbar-color: color-mix(in oklch, var(--color-gray-950) 30%, transparent) transparent;
    }

    #page-toc:hover::-webkit-scrollbar-thumb {
      background: color-mix(in oklch, var(--color-gray-950) 30%, transparent);
    }
  }
}

/* ── Scrollbar (Webkit) ───────────────────────────────── */

#navigation::-webkit-scrollbar {
  width: 6px;
}

#navigation::-webkit-scrollbar-track {
  background: transparent;
}

#navigation::-webkit-scrollbar-thumb {
  background: color-mix(in oklch, var(--color-gray-950) 15%, transparent);
  border-radius: 3px;
}

#navigation::-webkit-scrollbar-thumb:hover {
  background: color-mix(in oklch, var(--color-gray-950) 25%, transparent);
}

/* ── Prose: Content Styling ───────────────────────────── */

#contents {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--prose-color);
}

#contents h2 {
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--prose-heading-color);
  margin-top: 2.5rem;
  margin-bottom: 1rem;
  padding-bottom: 0.375rem;
  border-bottom: 1px solid var(--prose-hr-color);
}

#contents h3 {
  font-size: 1.25rem;
  font-weight: 600;
  color: var(--prose-heading-color);
  margin-top: 64px;
  margin-bottom: 0.75rem;
}

#contents h4 {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--prose-heading-color);
  margin-top: 1.5rem;
  margin-bottom: 0.5rem;
}

#contents p {
  margin: 0.875em 0;
}

/* ── Prose: Code ──────────────────────────────────────── */

/* Note: code, samp, kbd, and figcaption get translate="no"
   applied via style.js to prevent browser translation tools
   from corrupting code content. */

code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--prose-code-bg);
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
  border: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  color: var(--prose-code-color);
}

pre > code {
  display: block;
  overflow-x: auto;
  padding: var(--size-5);
  background: var(--color-gray-50);
  border: none;
  border-radius: 0.5rem;
  line-height: 2;
  font-size: 0.875rem;
  tab-size: 4;
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.08), 0 1px 2px color-mix(in oklch, black 4%, transparent);
}

pre {
  margin: 1.25em 0;
  position: relative;
}

/* ── Prose: Figure / Code Captions ────────────────────── */

figure {
  margin: 1.5em 0;
  overflow: hidden;
  border: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  border-radius: 0.75rem;
  background: var(--color-white);
  padding: var(--size-1);
  box-shadow: 0 1px 2px color-mix(in oklch, black 4%, transparent);
}

figure pre {
  margin: 0;
  border-radius: 0.5rem;
  background: var(--color-gray-50);
  padding: var(--size-5);
  font-size: 0.875rem;
  line-height: 20px;
  overflow-x: auto;
  box-shadow: inset 0 0 0 1px rgba(226, 232, 240, 0.8);
}

figure pre > code,
figure pre > samp {
  display: block;
  overflow: visible;
  padding: 0;
  background: transparent;
  border: none;
  border-radius: 0;
  font-size: 0.875rem;
  line-height: 20px;
  box-shadow: none;
}

figcaption {
  display: flex;
  justify-content: flex-start;
  align-items: center;
  height: 28px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  padding: 0 0 0 3px;
  background: transparent;
  border: none;
  color: var(--color-gray-500);
}

figcaption.shell-cap::before {
  content: "$";
  font-family: var(--font-mono);
  margin-right: var(--size-1);
}

@media (prefers-color-scheme: dark) {
  figure pre {
    box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1);
  }

  figcaption {
    color: #94a3b8;
  }
}

[data-theme='dark'] figure pre {
  box-shadow: inset 0 0 0 1px rgba(255, 255, 255, 0.1);
}

[data-theme='dark'] figcaption {
  color: #94a3b8;
}

@media (prefers-color-scheme: dark) {
  code {
    background: color-mix(in oklch, var(--color-gray-950) 10%, transparent);
    border-color: color-mix(in oklch, var(--color-gray-950) 15%, transparent);
    color: var(--color-gray-800);
  }

  pre > code {
    background: var(--color-gray-50);
    color: var(--color-gray-950);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1), 0 1px 2px color-mix(in oklch, black 4%, transparent);
  }

  pre > samp {
    background: var(--color-gray-50);
    color: var(--color-gray-950);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1), 0 1px 2px color-mix(in oklch, black 4%, transparent);
  }

}

/* ── Prose: <samp> ────────────────────────────────────── */

samp {
  font-family: var(--font-mono);
  background: #fafafa;
  padding: 0.125rem 0.375rem;
  border-radius: 0.25rem;
}

pre > samp {
  display: block;
  overflow-x: auto;
  padding: var(--size-5);
  border: none;
  border-radius: 0 0 0.5rem 0.5rem;
  line-height: 2;
  font-size: 0.875rem;
  background: var(--color-gray-50);
  box-shadow: inset 0 0 0 1px rgba(0,0,0,0.08), 0 1px 2px color-mix(in oklch, black 4%, transparent);
}

@media (prefers-color-scheme: dark) {
  samp {
    background: var(--color-gray-50);
    color: var(--color-gray-950);
  }
  pre > samp {
    background: var(--color-gray-50);
    color: var(--color-gray-950);
    box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1), 0 1px 2px color-mix(in oklch, black 4%, transparent);
  }
}

[data-theme='dark'] code {
  background: color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  border-color: color-mix(in oklch, var(--color-gray-950) 15%, transparent);
  color: var(--color-gray-800);
}

[data-theme='dark'] pre > code {
  background: var(--color-gray-50);
  color: var(--color-gray-950);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1), 0 1px 2px color-mix(in oklch, black 4%, transparent);
}

[data-theme='dark'] pre > samp {
  background: var(--color-gray-50);
  color: var(--color-gray-950);
  box-shadow: inset 0 0 0 1px rgba(255,255,255,0.1), 0 1px 2px color-mix(in oklch, black 4%, transparent);
}

[data-theme='dark'] samp {
  background: var(--color-gray-50);
  color: var(--color-gray-950);
}

/* ── Prose: <kbd> ──────────────────────────────────────── */

kbd {
  font-family: var(--font-mono);
  font-weight: normal;
  padding: 0.125rem 0.375rem;
  border: 1px solid color-mix(in oklch, var(--color-gray-950) 15%, transparent);
  border-radius: 0.25rem;
  background: var(--color-gray-50);
  font-size: 0.8125em;
}

/* ── Prose: <kbd> inside <samp> ───────────────────────── */
/* kbd inside sample output: no border, fully inherit samp text style */
samp > kbd,
samp kbd {
  border: none;
  background: transparent;
  padding: 0;
  font-family: inherit;
  font-size: inherit;
  font-weight: inherit;
  color: inherit;
  border-radius: 0;
}

/* ── Prose: Blockquote ────────────────────────────────── */

blockquote, aside {
  border-left: 4px solid color-mix(in oklch, var(--color-gray-950) 15%, transparent);
  padding: 0.75rem 1.25rem;
  margin: 1.5em 0;
  background: color-mix(in oklch, var(--color-gray-950) 2%, transparent);
  border-radius: 0 0.375rem 0.375rem 0;
}

@media (prefers-color-scheme: dark) {
  blockquote, aside {
    background: color-mix(in oklch, var(--color-gray-950) 8%, transparent);
    border-left-color: color-mix(in oklch, var(--color-gray-950) 25%, transparent);
  }
}

/* ── Prose: Lists ─────────────────────────────────────── */

#contents ul,
#contents ol {
  padding-left: 1.5rem;
  margin: 0.75em 0;
}

#contents li {
  margin: 0.25em 0;
  line-height: 1.7;
}

/* ── Prose: Definition Lists ──────────────────────────── */

dt {
  font-weight: 600;
  color: var(--prose-strong-color);
}

dd {
  margin: 0.25em 0 0.75em 1.5rem;
}

/* ── Prose: Tables ────────────────────────────────────── */

#contents table {
  width: 100%;
  border-collapse: separate;
  border-spacing: 0;
  font-size: 0.875rem;
  line-height: 1.4;
  margin: 2em 0;
}

#contents caption {
  display: none;
}

#contents caption {
  display: none;
}

#contents thead tr {
  background: transparent;
}

#contents th {
  white-space: nowrap;
  text-align: start;
  font-weight: 600;
  color: var(--prose-heading-color);
  padding: 0 .6em .8em .6em;
}

#contents thead th {
  vertical-align: bottom;
  border-bottom: 2px solid var(--prose-th-borders);
}

#contents thead th:first-child {
  padding-left: 0;
}

#contents thead th:last-child {
  padding-right: 0;
}

#contents tbody tr:nth-child(even) {
  background: transparent;
}

#contents td {
  white-space: nowrap;
  padding: .8em .6em .8em .6em;
  vertical-align: baseline;
  text-align: start;
  border-bottom: 1px solid var(--prose-td-borders);
}

#contents tbody th[scope='row'] {
  padding: .8em .6em .8em .6em;
  vertical-align: baseline;
  border-bottom: 1px solid var(--prose-td-borders);
}

#contents tbody td:first-child,
#contents tbody th:first-child {
  padding-left: 0;
}

#contents tbody td:last-child {
  padding-right: 0;
}

#contents tbody tr:last-child td,
#contents tbody tr:last-child th {
  border-bottom: 2px solid var(--prose-th-borders);
}

#contents th[scope='row'] {
  font-weight: 600;
}

#contents td code {
  font-size: 0.8125rem;
}

#contents table ul {
  list-style-type: none;
  padding: 0;
}

#contents table li {
  padding-bottom: 0.5rem;
  line-height: 1.4;
}

.table-wrapper {
  width: 100%;
  margin: 2em auto;
  overflow-x: auto;
}

.table-wrapper table {
  margin: 0;
  border: none;
  width: 100%;
}

@media (prefers-color-scheme: dark) {
  #contents thead th {
    border-bottom-color: var(--prose-th-borders);
  }
  #contents td,
  #contents tbody th[scope='row'] {
    border-bottom-color: var(--prose-td-borders);
  }
  #contents tbody tr:last-child td,
  #contents tbody tr:last-child th {
    border-bottom-color: var(--prose-th-borders);
  }
}

/* ── Syntax Highlighting ──────────────────────────────── */

.tok-kw {
  color: var(--color-syntax-keyword);
  font-weight: bold;
}
.tok-str {
  color: var(--color-syntax-string);
}
.tok-builtin {
  color: var(--color-syntax-builtin);
}
.tok-comment {
  color: var(--color-syntax-comment);
  font-style: italic;
}
.tok-fn {
  color: var(--color-syntax-function);
  font-weight: bold;
}
.tok-null {
  color: var(--color-syntax-null);
}
.tok-number {
  color: var(--color-syntax-number);
}
.tok-type {
  color: var(--color-syntax-type);
  font-weight: bold;
}

/* ── Terminal Output Classes ──────────────────────────── */

.sgr-1m { font-weight: bold; }
.sgr-2m { color: #575757; }
.sgr-31_1m { color: #b40000; }
.sgr-32_1m { color: green; }
.sgr-36_1m { color: #005c7a; }

@media (prefers-color-scheme: dark) {
  .sgr-2m { color: var(--color-gray-500); }
  .sgr-31_1m { color: #f87171; }
  .sgr-32_1m { color: #4ade80; }
  .sgr-36_1m { color: #38bdf8; }
}

/* ── File References ──────────────────────────────────── */

.file {
  font-weight: bold;
  border: none;
  background: none;
  padding: 0;
}

/* ── Inline heading link style ────────────────────────── */

th pre code {
  background: none;
  border: none;
  padding: 0;
}

/* ── Copy Button ───────────────────────────────────────── */

.code-block-header {
  display: flex;
  justify-content: flex-end;
  padding: var(--size-1) var(--size-2);
  opacity: 0;
  transition: opacity 0.15s ease;
  position: absolute;
  top: 0;
  right: 0;
  z-index: 1;
}

pre:hover .code-block-header {
  opacity: 1;
}

.copy-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--size-1);
  padding: var(--size-1) var(--size-2);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  line-height: 1;
  color: var(--color-gray-500);
  background: rgba(248, 250, 252, 0.82);
  border: 1px solid rgba(148, 163, 184, 0.28);
  border-radius: 0.5rem;
  cursor: pointer;
  margin-bottom: 3px;
  transition: color 0.15s ease, background-color 0.15s ease, border-color 0.15s ease;
}

.copy-btn:hover {
  color: var(--color-gray-700);
  background: rgba(241, 245, 249, 0.94);
  border-color: rgba(100, 116, 139, 0.42);
}

.copy-btn svg {
  width: 1rem;
  height: 1rem;
  flex-shrink: 0;
}

.copy-btn.copied {
  border-color: rgba(95, 116, 50, 0.38);
  background: rgba(95, 116, 50, 0.1);
  color: #5f7432;
}

.copy-btn.failed {
  border-color: rgba(180, 83, 9, 0.4);
  background: rgba(247, 164, 30, 0.12);
  color: #b45309;
}

@media (prefers-color-scheme: dark) {
  .copy-btn {
    color: #94a3b8;
    background: rgba(15, 23, 42, 0.74);
    border-color: rgba(148, 163, 184, 0.18);
  }
  .copy-btn:hover {
    color: #cbd5e1;
    background: rgba(30, 41, 59, 0.86);
    border-color: rgba(148, 163, 184, 0.34);
  }
  .copy-btn.copied {
    border-color: rgba(169, 189, 110, 0.34);
    background: rgba(169, 189, 110, 0.14);
    color: #a9bd6e;
  }
  .copy-btn.failed {
    border-color: rgba(247, 164, 30, 0.4);
    background: rgba(247, 164, 30, 0.15);
    color: #f7a41e;
  }
}

[data-theme='dark'] .copy-btn {
  color: #94a3b8;
  background: rgba(15, 23, 42, 0.74);
  border-color: rgba(148, 163, 184, 0.18);
}
[data-theme='dark'] .copy-btn:hover {
  color: #cbd5e1;
  background: rgba(30, 41, 59, 0.86);
  border-color: rgba(148, 163, 184, 0.34);
}
[data-theme='dark'] .copy-btn.copied {
  border-color: rgba(169, 189, 110, 0.34);
  background: rgba(169, 189, 110, 0.14);
  color: #a9bd6e;
}
[data-theme='dark'] .copy-btn.failed {
  border-color: rgba(247, 164, 30, 0.4);
  background: rgba(247, 164, 30, 0.15);
  color: #f7a41e;
}

figure .code-block-header {
  position: static;
  opacity: 1;
  padding: 0;
  margin-left: auto;
}

/* ── Print Styles ─────────────────────────────────────── */

@media print {
  body {
    background: #fff;
    color: #000;
  }

  #navigation {
    display: none;
  }

  #page-toc {
    display: none !important;
  }

  #top-bar {
    display: none;
  }

  #contents-wrapper {
    margin-left: 0;
    padding: 0;
  }

  #contents {
    max-width: 100%;
  }

  code {
    background: #f5f5f5;
    border: 1px solid #ddd;
  }

  pre > code {
    border: 1px solid #ddd;
    page-break-inside: avoid;
  }

  a {
    color: #000;
    text-decoration: underline;
  }

  h1, h2, h3, h4, h5, h6 {
    page-break-after: avoid;
  }

  a.hdr {
    display: none;
  }
}

/* ── Overlay (used for sidebar mobile backdrop & search) ── */

.overlay {
  position: fixed;
  inset: 0;
  z-index: 30;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: opacity 0.2s ease, visibility 0.2s ease;
}

.overlay.visible {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
}

/* ── Sidebar Mobile Overlay ─────────────────────────────── */

#sidebar-overlay {
  z-index: 35;
  background: rgba(0, 0, 0, 0.25);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
}

/* ── Search Modal ───────────────────────────────────────── */

#search-overlay {
  z-index: 60;
  background: rgba(0, 0, 0, 0.25);
  background: color-mix(in oklch, rgba(0, 0, 0) 20%, transparent);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  align-items: flex-start;
  padding: 1.5rem 1.5rem 1.5rem;
  padding-top: 10vh;
}

@media (prefers-color-scheme: dark) {
  #search-overlay {
    background: rgba(0, 0, 0, 0.5);
    background: color-mix(in oklch, rgba(0, 0, 0) 40%, transparent);
  }
}

[data-theme='dark'] #search-overlay {
  background: color-mix(in oklch, rgba(0, 0, 0) 40%, transparent);
}

.search-modal {
  background: var(--color-white);
  border: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  border-radius: 0.75rem;
  box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  width: min(90vw, 47.375rem);
  max-height: min(60vh, 30rem);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transform: scale(0.95) translateY(-0.75rem);
  opacity: 0;
  transition: transform 0.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.15s ease;
}

.overlay.visible .search-modal {
  transform: scale(1) translateY(0);
  opacity: 1;
}

@media (prefers-color-scheme: dark) {
  .search-modal {
    background: #18181b;
    border-color: color-mix(in oklch, var(--color-gray-950) 20%, transparent);
    box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
  }
}

.search-bar {
  display: flex;
  align-items: center;
  gap: var(--size-3);
  padding: 0 var(--size-5);
  border-bottom: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  flex-shrink: 0;
}

@media (prefers-color-scheme: dark) {
  .search-bar {
    border-bottom-color: color-mix(in oklch, var(--color-gray-950) 15%, transparent);
  }
}

.search-bar .search-icon {
  flex-shrink: 0;
  color: var(--color-gray-400);
  width: 1.25rem;
  height: 1.25rem;
}

.search-bar .search-icon path {
  fill: currentColor;
  fill-rule: evenodd;
}

#search-input {
  flex: 1;
  /* 允许收缩: type=search 自带 size 固有宽度, 不设 min-width: 0 会把 ESC kbd 挤出搜索框 */
  min-width: 0;
  height: 3.5rem;
  border: none;
  background: transparent;
  font-size: 1rem;
  font-family: var(--font-sans);
  color: var(--prose-heading-color);
  outline: none;
}

#search-input::placeholder {
  color: var(--color-gray-400);
}

@media (prefers-color-scheme: dark) {
  #search-input {
    color: var(--color-gray-900);
  }
  #search-input::placeholder {
    color: var(--color-gray-500);
  }
}

.search-kbd {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0 var(--size-1_5);
  height: 1.5rem;
  min-width: 1.5rem;
  font-family: var(--font-sans);
  font-size: 0.75rem;
  line-height: 1;
  color: var(--color-gray-500);
  background: var(--color-gray-100);
  border: 1px solid color-mix(in oklch, var(--color-gray-950) 10%, transparent);
  border-radius: 0.25rem;
}

@media (prefers-color-scheme: dark) {
  .search-kbd {
    color: var(--color-gray-400);
    background: var(--color-gray-200);
    border-color: color-mix(in oklch, var(--color-gray-950) 20%, transparent);
  }
}

.search-results {
  flex: 1;
  overflow-y: auto;
  padding: var(--size-2) 0;
  max-height: 40vh;
}

.search-empty {
  padding: var(--size-8) var(--size-5);
  text-align: center;
  color: var(--color-gray-400);
  font-size: 0.875rem;
}

.search-result-count {
  padding: var(--size-1_5) var(--size-5) var(--size-1);
  font-size: 0.6875rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-gray-400);
}

.search-result-item {
  display: flex;
  align-items: center;
  gap: var(--size-2);
  padding: var(--size-2) var(--size-5);
  color: var(--color-gray-700);
  text-decoration: none;
  font-size: 0.875rem;
  cursor: pointer;
  transition: background 0.1s ease;
}

.search-result-item:hover,
.search-result-item.selected {
  background: color-mix(in oklch, var(--color-gray-950) 4%, transparent);
  color: var(--color-gray-950);
}

.search-result-item.selected {
  font-weight: 500;
}

.search-result-item .result-icon {
  flex-shrink: 0;
  color: var(--color-gray-400);
  width: 1rem;
  height: 1rem;
}

.search-result-item .result-section {
  font-size: 0.75rem;
  color: var(--color-gray-400);
  margin-left: auto;
  flex-shrink: 0;
}

@media (prefers-color-scheme: dark) {
  .search-result-item {
    color: var(--color-gray-600);
  }
  .search-result-item:hover,
  .search-result-item.selected {
    background: color-mix(in oklch, var(--color-gray-950) 15%, transparent);
    color: var(--color-gray-900);
  }
  .search-result-item .result-icon {
    color: var(--color-gray-500);
  }
  .search-result-item .result-section {
    color: var(--color-gray-500);
  }
}

/* ── Pagination: Page Container ──────────────────────────── */

.h2-page {
  display: none;
}

.h2-page.active {
  display: block;
}

/* ── Pagination: Bottom Navigation ──────────────────────── */

.h2-pagination {
  display: flex;
  align-items: center;
  justify-content: space-between;
  /* 按钮与计数器最小间距: 窄屏时提供宽度冗余, 避免紧贴 */
  gap: var(--size-3);
  margin-top: 3rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--prose-hr-color);
}

/* 翻页按钮: 与主站 global-pretty.css 的 .button 胶囊按钮样式保持一致
   选择器带 #contents 前缀以压过 #contents a 的通用下划线规则;
   箭头与标题文字为独立 span (page-arrow/page-label): 箭头 flex-shrink: 0
   不参与截断, 文字在自身右缘省略号截断 */
#contents .h2-pagination a {
  display: inline-flex;
  align-items: center;
  /* 箭头与文字间距: flex gap 与子元素顺序无关, 左侧(← 文字)与右侧(文字 →)按钮统一生效 */
  gap: 9px;
  min-height: 2.625rem;
  flex: 0 1 auto;
  min-width: 0;
  max-width: 40%;
  padding: 0 1.125rem;
  border: 1px solid var(--color-gray-300);
  border-radius: 0.5rem;
  background: var(--color-white);
  box-shadow: 0 1px 2px rgba(15, 23, 42, 0.05);
  font-size: 0.875rem;
  font-weight: 600;
  line-height: 1.25;
  color: var(--color-gray-900);
  text-decoration: none;
  transition: border-color 0.15s ease, background 0.15s ease, transform 0.15s ease;
}

/* 窄屏: 两按钮均分计数器之外的剩余空间, 文字在自身右缘省略号截断 */
@media screen and (max-width: 40rem) {
  #contents .h2-pagination a {
    flex: 1 1 0;
    max-width: none;
  }
}

#contents .h2-pagination .page-arrow {
  flex-shrink: 0;
}

#contents .h2-pagination .page-label {
  /* 撑满按钮剩余空间: 下一页箭头顶到最右缘; 窄屏文字在自身右缘省略号截断 */
  flex: 1 1 auto;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#contents .h2-pagination a:hover {
  border-color: var(--color-gray-400);
  background: var(--color-white);
  color: var(--color-gray-900);
  transform: translateY(-1px);
  text-decoration: none;
}

.page-counter {
  font-size: 0.8125rem;
  color: var(--color-gray-400);
  font-weight: 500;
  flex-shrink: 0;
}

@media (prefers-color-scheme: dark) {
  #contents .h2-pagination a {
    border-color: color-mix(in oklch, var(--color-gray-400) 35%, transparent);
    background: var(--color-gray-100);
    color: var(--color-gray-900);
    box-shadow: 0 1px 2px rgba(0, 0, 0, 0.32);
  }
  #contents .h2-pagination a:hover {
    border-color: color-mix(in oklch, var(--color-gray-400) 55%, transparent);
    background: var(--color-gray-200);
    color: var(--color-gray-900);
  }
}

/* ── Print: hide interactive elements ──────────────────── */

@media print {
  #top-bar,
  #sidebar-overlay,
  #search-overlay {
    display: none !important;
  }

  .h2-page {
    display: block !important;
  }

  .h2-pagination {
    display: none !important;
  }
}

/* ── ICP 备案区: 强制灰字 12px + 底部两行空白 ───────────── */

/* 备案区经 style.js 移入 #contents 末尾, 与正文列对齐居中展示;
   强制灰字 12px, 防止被内容区排版规则 (链接着色/行高) 覆盖 */
#contents .icp-footer {
  --icp-footer-color: #666;
  --icp-footer-hover-color: #000;
  color: var(--icp-footer-color) !important;
  font-size: 12px !important;
  line-height: 1.5 !important;
  /* 短章节时贴内容列底部, 长章节时以 padding-top 保持 28px 间距 */
  margin-top: auto;
  padding-top: 28px;
  /* 底部两行空白 (2 x 1.5 行高, 12px 字号下为 36px) */
  padding-bottom: 3em;
}

#contents .icp-footer-notice,
#contents .icp-footer-license-line,
#contents .icp-footer-label {
  color: var(--icp-footer-color) !important;
}

/* 备案号链接: 自持常规字重/非 hover 无下划线 (hover 时才出下划线),
   hover 不继承正文 700 字重 (不变大) */
#contents .icp-footer-license {
  font-weight: normal !important;
  text-decoration: none !important;
  text-underline-offset: 3px !important;
}

#contents .icp-footer-license:not(:hover) {
  color: var(--icp-footer-color) !important;
}

#contents .icp-footer-license:hover {
  text-decoration: underline !important;
}

/* 平台名称链接: 自持 600 字重, 不继承正文链接样式
   (hover 态交回共享样式: 下划线 + 深色, 字重保持 600 不变大) */
#contents .icp-footer-link {
  font-weight: 600 !important;
}

#contents .icp-footer-link:not(:hover) {
  color: var(--icp-footer-color) !important;
  text-decoration: none !important;
}

/* hover 态颜色自持: 不继承正文链接 hover 色, 用共享组件配色 */
#contents .icp-footer-license:hover,
#contents .icp-footer-link:hover {
  color: var(--icp-footer-hover-color) !important;
}

/* 下划线颜色/粗细自持: 不继承正文链接的 sky 色调装饰色与 2px 粗细 */
#contents .icp-footer-license:not(:hover),
#contents .icp-footer-link:not(:hover) {
  text-decoration-color: var(--icp-footer-color) !important;
  text-decoration-thickness: auto !important;
}

/* hover 态: 下划线颜色跟随自身文字色, 不采用正文 hover 装饰色 */
#contents .icp-footer-license:hover,
#contents .icp-footer-link:hover {
  text-decoration-color: currentColor !important;
  text-decoration-thickness: auto !important;
}

/* 暗色主题: 强制色切换为浅灰 (与共享 icp-footer.css 取值一致) */
@media (prefers-color-scheme: dark) {
  #contents .icp-footer {
    --icp-footer-color: #a1a1aa;
    --icp-footer-hover-color: #fff;
  }
}

[data-theme='dark'] #contents .icp-footer {
  --icp-footer-color: #a1a1aa;
  --icp-footer-hover-color: #fff;
}

/* ── ICP 备案区: 短章节底部对齐 ───────────────────────── */

/* 内容列转为 flex 列并至少撑满视口 (扣除顶栏与 wrapper 垂直内边距),
   短章节时备案区经 margin-top: auto 贴视口底部对齐, 不再紧跟内容偏高 */
#contents {
  display: flex;
  flex-direction: column;
  min-height: calc(100dvh - var(--top-bar-height));
}

@media screen and (min-width: 64rem) {
  #contents {
    min-height: calc(100dvh - var(--top-bar-height) - var(--size-8) - var(--size-16));
  }
}

/* 打印: 取消视口撑满, 避免产生多余空白页 */
@media print {
  #contents {
    min-height: 0;
  }
}