/* =========================================================
   6319登录 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 侧边轨道 / 页脚 / 基础组件
   ========================================================= */

/* ---------- 1. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; scroll-padding-top: 5.5rem; }

body,
h1, h2, h3, h4, h5, h6,
p, figure, blockquote, dl, dd, ul, ol { margin: 0; }

ul[class],
ol[class] { list-style: none; padding: 0; }

img, svg, video { display: block; max-width: 100%; height: auto; }

button, input, select, textarea { font: inherit; color: inherit; }

a { color: inherit; }

/* ---------- 2. 变量 ---------- */
:root {
  --ink-950: #07131F;
  --ink-900: #0B1B2A;
  --ink-800: #12263A;
  --ink-700: #1A334A;
  --line: #2E4256;
  --paper: #F4EFE6;
  --paper-dim: #E8DFD2;
  --cyan-400: #2FE6C8;
  --cyan-600: #14A89A;
  --amber-400: #E8A838;
  --amber-600: #B8791F;
  --text-primary: #E9F0F5;
  --text-muted: #A8B8C6;
  --text-on-paper: #14202B;
  --danger: #E35D6A;
  --success: #4CD98A;

  --text: var(--text-primary);

  --rail-w: 276px;
  --gap: 1.25rem;
  --radius-xs: 2px;
  --radius-sm: 4px;

  --fs-display: clamp(2.8rem, 6vw, 5.2rem);
  --fs-h1: clamp(2.2rem, 4.6vw, 4rem);
  --fs-h2: clamp(1.6rem, 3vw, 2.6rem);
  --fs-h3: 1.25rem;

  --font-head: "Noto Sans SC", "HarmonyOS Sans", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", "SFMono-Regular", Consolas, monospace;

  --dur: 220ms;
  --dur-fast: 150ms;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  margin: 0;
  padding-left: var(--rail-w);
  min-height: 100vh;
  background: var(--ink-900);
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 1rem;
  font-weight: 400;
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: inherit;
}

h1, .h1 { font-size: var(--fs-h1); }
h2, .h2 { font-size: var(--fs-h2); }
h3, .h3 { font-size: var(--fs-h3); line-height: 1.35; }

.display {
  font-family: var(--font-head);
  font-size: var(--fs-display);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.01em;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-400);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  opacity: 0.7;
}

.lede {
  max-width: 62ch;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.7;
  color: var(--text-muted);
}

.meta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem 1.25rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* ---------- 4. 焦点与可访问 ---------- */
:focus-visible {
  outline: 2px solid var(--cyan-400);
  outline-offset: 2px;
  border-radius: var(--radius-xs);
}

#main-content { outline: none; }

.skip-link {
  position: fixed;
  top: 0.6rem;
  left: 0.6rem;
  z-index: 300;
  padding: 0.6rem 1rem;
  background: var(--cyan-400);
  color: #04211D;
  font-family: var(--font-head);
  font-size: 0.875rem;
  font-weight: 800;
  text-decoration: none;
  border-radius: var(--radius-sm);
  transform: translateY(-220%);
  transition: transform var(--dur) var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* ---------- 5. 布局容器 ---------- */
.shell {
  width: min(100% - 2.5rem, 1200px);
  margin-inline: auto;
}

.section { padding-block: clamp(2.75rem, 6vw, 5.5rem); }
.section-tight { padding-block: clamp(1.75rem, 4vw, 3rem); }

.section-head {
  max-width: 64ch;
  margin-bottom: clamp(1.5rem, 3vw, 2.5rem);
}

.grid {
  display: grid;
  gap: var(--gap);
}
.cols-2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.cols-3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.cols-4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }

.ledger {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: var(--gap);
}
.span-4 { grid-column: span 4; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }
.shift-1 { grid-column-start: 2; }

.stack {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
}
.cluster {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.6rem;
}

.divider {
  height: 1px;
  border: 0;
  background: var(--line);
  margin-block: clamp(1.5rem, 3vw, 2.5rem);
}
.rule-glow {
  height: 1px;
  border: 0;
  background: linear-gradient(90deg, var(--cyan-600), rgba(46, 66, 86, 0));
}

/* ---------- 6. 暖纸阅读区 ---------- */
.surface-paper {
  background: var(--paper);
  color: var(--text-on-paper);
}
.surface-paper h1,
.surface-paper h2,
.surface-paper h3 { color: var(--text-on-paper); }
.surface-paper .lede { color: #4A5A67; }
.surface-paper .eyebrow { color: var(--cyan-600); }
.surface-paper .meta-row { color: #5B6B78; }
.surface-paper .divider { background: #D9CDBC; }
.surface-paper .card {
  background: #FFFDF9;
  border-color: #DDD1C0;
  color: var(--text-on-paper);
}
.surface-paper .card:hover {
  background: #FFFFFF;
  border-color: #C6B49C;
}
.surface-paper .callout {
  background: rgba(20, 168, 154, 0.1);
  color: var(--text-on-paper);
}
.surface-paper .tag { background: rgba(20, 32, 43, 0.07); color: #3B4A57; }
.surface-paper .tag-cyan { background: rgba(20, 168, 154, 0.16); color: #0C5F58; }
.surface-paper .tag-amber { background: rgba(184, 121, 31, 0.16); color: #7A4E0B; }
.surface-paper .btn-ghost {
  --btn-fg: var(--text-on-paper);
  --btn-bd: #C9B9A4;
}
.surface-paper .btn-ghost:hover {
  --btn-bd: var(--cyan-600);
  --btn-fg: #0C5F58;
  background: rgba(20, 168, 154, 0.08);
}
.surface-paper .table-wrap {
  background: #FFFDF9;
  border-color: #DDD1C0;
}
.surface-paper .data-table thead th {
  background: var(--paper-dim);
  color: #0C5F58;
}
.surface-paper .data-table th,
.surface-paper .data-table td { border-bottom-color: #E3D8C9; }
.surface-paper .data-table tbody tr:nth-child(even) { background: #F7F2E9; }
.surface-paper .data-table tbody tr:hover { background: #EFE7DA; }
.surface-paper .prose a { color: var(--cyan-600); }

/* ---------- 7. 按钮 ---------- */
.btn {
  --btn-bg: transparent;
  --btn-fg: var(--text-primary);
  --btn-bd: var(--line);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  min-height: 44px;
  padding: 0.68rem 1.15rem;
  background: var(--btn-bg);
  color: var(--btn-fg);
  border: 1px solid var(--btn-bd);
  border-radius: var(--radius-sm);
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-decoration: none;
  cursor: pointer;
  transition:
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.btn:hover { transform: translateY(-1px); }
.btn:active { transform: translateY(0); }

.btn-primary {
  --btn-bg: var(--cyan-400);
  --btn-fg: #04211D;
  --btn-bd: var(--cyan-400);
  box-shadow: 0 8px 22px -14px rgba(47, 230, 200, 0.9);
}
.btn-primary:hover {
  --btn-bg: #63F2D9;
  --btn-bd: #63F2D9;
}

.btn-ghost { --btn-bg: transparent; }
.btn-ghost:hover {
  --btn-bd: var(--cyan-600);
  --btn-fg: var(--cyan-400);
  background: rgba(47, 230, 200, 0.07);
}

.btn-amber {
  --btn-bg: var(--amber-400);
  --btn-fg: #2A1B02;
  --btn-bd: var(--amber-400);
}
.btn-amber:hover {
  --btn-bg: #F2BD5C;
  --btn-bd: #F2BD5C;
}

.btn-sm {
  min-height: 36px;
  padding: 0.42rem 0.8rem;
  font-size: 0.8125rem;
}
.btn-block { width: 100%; }

/* ---------- 8. 标签 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  background: var(--ink-700);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border-radius: var(--radius-xs);
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 0 100%);
}
.tag-cyan { background: rgba(47, 230, 200, 0.14); color: var(--cyan-400); }
.tag-amber { background: rgba(232, 168, 56, 0.16); color: var(--amber-400); }
.tag-danger { background: rgba(227, 93, 106, 0.16); color: var(--danger); }
.tag-success { background: rgba(76, 217, 138, 0.14); color: var(--success); }

/* ---------- 9. 卡片与档案夹 ---------- */
.card {
  position: relative;
  padding: clamp(1.1rem, 2vw, 1.6rem);
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  transition:
    background-color var(--dur) var(--ease),
    border-color var(--dur) var(--ease),
    transform var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}
.card-hover:hover,
.card:hover {
  background: var(--ink-700);
  border-color: #3E5E78;
  transform: translateY(-2px);
  box-shadow: 0 20px 44px -34px rgba(0, 0, 0, 0.95);
}

.dossier { position: relative; padding-top: 2.7rem; }
.dossier[data-tab]::before {
  content: attr(data-tab);
  position: absolute;
  top: 0;
  left: 0;
  max-width: 80%;
  padding: 0.3rem 1.1rem 0.3rem 0.85rem;
  background: var(--ink-700);
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  clip-path: polygon(0 0, 100% 0, calc(100% - 12px) 100%, 0 100%);
}

/* ---------- 10. 媒体容器（页面阶段放图） ---------- */
.media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  background:
    radial-gradient(120% 90% at 50% 0%, rgba(47, 230, 200, 0.1), transparent 62%),
    linear-gradient(160deg, #0E2233, #07131F 72%);
}
.media > img,
.media > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-16x9 { aspect-ratio: 16 / 9; }
.media-4x3 { aspect-ratio: 4 / 3; }
.media-3x2 { aspect-ratio: 3 / 2; }
.media-1x1 { aspect-ratio: 1 / 1; }

.media-frame { position: relative; }
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image: repeating-linear-gradient(180deg, rgba(233, 240, 245, 0.045) 0 1px, transparent 1px 4px);
}

.media-cap {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

/* ---------- 11. 数据表 ---------- */
.table-wrap {
  overflow-x: auto;
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.data-table {
  width: 100%;
  min-width: 640px;
  border-collapse: collapse;
  font-size: 0.9375rem;
}
.data-table th,
.data-table td {
  padding: 0.75rem 1rem;
  text-align: left;
  vertical-align: top;
  border-bottom: 1px solid var(--line);
}
.data-table thead th {
  background: var(--ink-900);
  color: var(--cyan-400);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  white-space: nowrap;
}
.data-table tbody tr:nth-child(even) { background: rgba(46, 66, 86, 0.22); }
.data-table tbody tr:hover { background: var(--ink-700); }
.data-table tbody tr:last-child th,
.data-table tbody tr:last-child td { border-bottom: 0; }

/* ---------- 12. 抽屉对比 ---------- */
.drawer {
  background: var(--ink-800);
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
}
.drawer + .drawer { margin-top: 0.75rem; }
.drawer-head { margin: 0; }
.drawer-toggle {
  display: flex;
  width: 100%;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 1rem 1.15rem;
  background: transparent;
  border: 0;
  text-align: left;
  font-family: var(--font-head);
  font-size: 1rem;
  font-weight: 700;
  color: inherit;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease);
}
.drawer-toggle:hover { background: var(--ink-700); }
.drawer-sign {
  font-family: var(--font-mono);
  font-size: 1.1rem;
  line-height: 1;
  color: var(--cyan-400);
  transition: transform var(--dur) var(--ease);
}
.drawer-toggle[aria-expanded="true"] .drawer-sign { transform: rotate(45deg); }
.drawer-body {
  padding: 0.25rem 1.15rem 1.25rem;
  border-top: 1px solid var(--line);
}

/* ---------- 13. 面包屑 / 数据块 / 提示 ---------- */
.crumbs {
  padding-top: 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.crumbs li {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.crumbs li + li::before {
  content: "/";
  color: var(--line);
}
.crumbs a {
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.crumbs a:hover {
  color: var(--cyan-400);
  border-bottom-color: currentColor;
}
.crumbs [aria-current="page"] { color: var(--text-primary); }

.stat { display: block; }
.stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan-400);
}
.stat-label {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--text-muted);
}
.surface-paper .stat-label { color: #5B6B78; }
.surface-paper .stat-num { color: var(--cyan-600); }

.callout {
  padding: 0.95rem 1.15rem;
  background: rgba(47, 230, 200, 0.06);
  border-left: 2px solid var(--cyan-400);
  border-radius: 0 var(--radius-sm) var(--radius-sm) 0;
}
.callout p + p { margin-top: 0.6em; }
.callout-amber {
  background: rgba(232, 168, 56, 0.08);
  border-left-color: var(--amber-400);
}

/* ---------- 14. 长文阅读 ---------- */
.prose { max-width: 68ch; }
.prose > * + * { margin-top: 1.1em; }
.prose h2 { margin-top: 2.2em; }
.prose h3 { margin-top: 1.8em; }
.prose ul,
.prose ol { padding-left: 1.4em; }
.prose li + li { margin-top: 0.4em; }
.prose a {
  color: var(--cyan-400);
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}
.prose strong { font-weight: 700; color: var(--text-primary); }
.surface-paper .prose strong { color: var(--text-on-paper); }

/* ---------- 15. 阅读进度 ---------- */
.site-progress {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  height: 2px;
  z-index: 120;
  background: rgba(46, 66, 86, 0.5);
  pointer-events: none;
}
.site-progress-bar {
  display: block;
  width: 0;
  height: 100%;
  background: linear-gradient(90deg, var(--cyan-600), var(--cyan-400) 60%, var(--amber-400));
  transition: width 120ms linear;
}

/* ---------- 16. 侧边轨道（头部） ---------- */
.site-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  z-index: 90;
  background: var(--ink-950);
  color: var(--text-primary);
  border-right: 1px solid var(--line);
}
.site-rail::before {
  content: "";
  position: absolute;
  top: 0;
  right: -1px;
  width: 1px;
  height: 100%;
  pointer-events: none;
  background: linear-gradient(
    180deg,
    transparent,
    rgba(47, 230, 200, 0.55) 22%,
    rgba(232, 168, 56, 0.4) 78%,
    transparent
  );
}
.site-rail::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  opacity: 0.55;
  background-image: repeating-linear-gradient(180deg, rgba(233, 240, 245, 0.03) 0 1px, transparent 1px 6px);
}

.rail-inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(1rem, 3vh, 1.75rem);
  height: 100%;
  padding: 1.6rem 1.35rem 1.3rem;
  overflow-y: auto;
  scrollbar-width: thin;
}

.rail-head {
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.7rem;
  text-decoration: none;
  color: inherit;
}
.brand-mark {
  position: relative;
  display: grid;
  place-items: center;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  background: linear-gradient(145deg, var(--cyan-400), var(--cyan-600));
  clip-path: polygon(0 0, 70% 0, 100% 30%, 100% 100%, 30% 100%, 0 70%);
}
.brand-mark-core {
  width: 13px;
  height: 13px;
  border: 2px solid var(--ink-950);
  border-radius: 50%;
}
.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.25;
}
.brand-name {
  font-family: var(--font-head);
  font-size: 1.0625rem;
  font-weight: 900;
  letter-spacing: 0.01em;
}
.brand-tagline {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}

/* 移动导航按钮：桌面隐藏 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 0.55rem;
  min-height: 40px;
  padding: 0.45rem 0.7rem;
  background: transparent;
  border: 1px solid var(--line);
  border-radius: var(--radius-sm);
  color: var(--text-primary);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover {
  border-color: var(--cyan-600);
  color: var(--cyan-400);
}
.nav-toggle-bars {
  display: grid;
  gap: 3px;
  width: 16px;
}
.nav-toggle-bars span {
  display: block;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease), opacity var(--dur-fast) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle-label { line-height: 1; }

.rail-nav { display: block; }
.rail-nav-list {
  counter-reset: railnav;
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.rail-nav-link {
  position: relative;
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.6rem 0.75rem 0.6rem 0.9rem;
  border-left: 2px solid transparent;
  color: var(--text-muted);
  font-family: var(--font-head);
  font-size: 0.9375rem;
  font-weight: 600;
  text-decoration: none;
  transition:
    background-color var(--dur) var(--ease),
    color var(--dur) var(--ease),
    border-color var(--dur) var(--ease);
}
.rail-nav-link::before {
  counter-increment: railnav;
  content: counter(railnav, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--text-muted);
  opacity: 0.65;
}
.rail-nav-link:hover {
  background: var(--ink-800);
  color: var(--text-primary);
  border-left-color: var(--cyan-600);
}
.rail-nav-link[aria-current="page"] {
  background: var(--ink-800);
  color: var(--text-primary);
  border-left-color: var(--cyan-400);
}
.rail-nav-link[aria-current="page"]::before {
  color: var(--cyan-400);
  opacity: 1;
}

.rail-foot {
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  margin-top: auto;
  padding-top: 1.15rem;
  border-top: 1px solid var(--line);
}
.rail-note {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.05em;
  color: var(--text-muted);
}
.pulse-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--success);
  box-shadow: 0 0 0 3px rgba(76, 217, 138, 0.16);
}
.rail-actions {
  display: grid;
  gap: 0.5rem;
}

/* ---------- 17. 页脚 ---------- */
.site-foot {
  position: relative;
  padding: clamp(2.5rem, 5vw, 4rem) 0 1.5rem;
  background: var(--ink-950);
  color: var(--text-muted);
  border-top: 1px solid var(--line);
}
.site-foot::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(47, 230, 200, 0.6), rgba(232, 168, 56, 0.45), transparent);
}

.foot-grid {
  display: grid;
  grid-template-columns: 1.35fr 0.85fr 1.15fr 0.85fr;
  gap: clamp(1.5rem, 3vw, 2.5rem);
}
.foot-brand { min-width: 0; }
.foot-name {
  font-family: var(--font-head);
  font-size: 1.15rem;
  font-weight: 900;
  letter-spacing: 0.01em;
  color: var(--text-primary);
}
.foot-desc {
  margin-top: 0.5rem;
  max-width: 34ch;
  font-size: 0.875rem;
}
.foot-icp {
  margin-top: 0.9rem;
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

.foot-col { min-width: 0; }
.foot-title {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--cyan-400);
}
.foot-list {
  display: grid;
  gap: 0.55rem;
  margin: 0.9rem 0 0;
  padding: 0;
  list-style: none;
}
.foot-link {
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.foot-link:hover {
  color: var(--text-primary);
  border-bottom-color: var(--cyan-400);
}

.foot-item {
  display: grid;
  gap: 0.15rem;
  font-size: 0.8125rem;
}
.foot-label {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: #7F93A3;
}
.foot-value {
  color: var(--text-primary);
  word-break: break-word;
}

.copy-btn {
  display: inline-flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  max-width: 100%;
  padding: 0.2rem 0.45rem;
  background: transparent;
  border: 1px dashed var(--line);
  border-radius: var(--radius-xs);
  color: inherit;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  text-align: left;
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.copy-btn:hover {
  border-color: var(--cyan-600);
  color: var(--cyan-400);
}
.copy-btn[data-copied="true"] {
  border-style: solid;
  border-color: var(--success);
  color: var(--success);
}
.copy-flag {
  font-size: 0.6875rem;
  letter-spacing: 0.06em;
  color: var(--text-muted);
}
.copy-btn[data-copied="true"] .copy-flag { color: var(--success); }

.foot-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.75rem 1.5rem;
  margin-top: clamp(2rem, 4vw, 3rem);
  padding-top: 1.25rem;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
}
.foot-region { color: var(--text-muted); }

/* ---------- 18. 渐显 ---------- */
[data-reveal].is-armed {
  opacity: 0;
  transform: translateY(14px);
}
[data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity 420ms var(--ease), transform 420ms var(--ease);
}

/* ---------- 19. 响应式：平板 ---------- */
@media (max-width: 1023px) {
  :root { --rail-w: 0px; }

  body { padding-left: 0; }

  .site-rail {
    position: sticky;
    top: 0;
    left: auto;
    bottom: auto;
    width: 100%;
    height: auto;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .site-rail::before { display: none; }
  .site-rail::after { opacity: 0.3; }
  .site-rail[data-open="true"] {
    box-shadow: 0 26px 54px -32px rgba(0, 0, 0, 0.95);
  }

  .rail-inner {
    gap: 0;
    height: auto;
    max-height: calc(100dvh - 1px);
    padding: 0.7rem 1rem 0.85rem;
    overflow-y: auto;
  }

  .rail-head {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
    gap: 1rem;
  }
  .brand-tagline { font-size: 0.625rem; }
  .nav-toggle { display: inline-flex; }

  .rail-nav {
    display: none;
    margin-top: 0.85rem;
    padding-top: 0.85rem;
    border-top: 1px solid var(--line);
  }
  .site-rail[data-open="true"] .rail-nav { display: block; }
  .rail-nav-link { padding: 0.7rem 0.75rem; }

  .rail-foot { display: none; }
  .site-rail[data-open="true"] .rail-foot {
    display: flex;
    margin-top: 0.9rem;
    padding-top: 0.9rem;
    border-top: 1px solid var(--line);
  }
  .rail-actions { grid-template-columns: 1fr 1fr; }

  .foot-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }

  .cols-4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .cols-3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .ledger { grid-template-columns: 1fr; }
  .span-4, .span-6, .span-7, .span-8, .span-12 { grid-column: auto; }
  .shift-1 { grid-column-start: auto; }
}

/* ---------- 20. 响应式：手机 ---------- */
@media (max-width: 620px) {
  body { font-size: 0.9688rem; }
  .shell { width: min(100% - 1.75rem, 1200px); }
  .cols-2, .cols-3, .cols-4 { grid-template-columns: 1fr; }
  .rail-actions { grid-template-columns: 1fr; }
  .foot-grid { grid-template-columns: 1fr; }
  .foot-base { flex-direction: column; align-items: flex-start; }
  .data-table { min-width: 520px; }
  .drawer-toggle { padding: 0.85rem 1rem; }
  .drawer-body { padding: 0.25rem 1rem 1rem; }
}

/* ---------- 21. 降低动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  .btn:hover { transform: none; }
  .card:hover,
  .card-hover:hover { transform: none; }
  [data-reveal].is-armed { opacity: 1; transform: none; }
  [data-reveal].is-visible { transition: none; }
  .site-progress-bar { transition: none; }
  .skip-link { transition: none; }
}