/* ============================================================
   欧博会馆 · daohang-oubo.com.cn
   /assets/site.css — 共享层：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

/* 1. Reset ------------------------------------------------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, pre { margin: 0; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; }
summary { cursor: pointer; }
[hidden] { display: none !important; }

/* 2. 变量 -------------------------------------------------- */
:root {
  --ink: #070A14;
  --plate: #111524;
  --line: #2C3142;
  --gold: #E4C070;
  --gold-deep: #A9822F;
  --violet: #A468FF;
  --cyan: #49D6E8;
  --amber: #FF8A3D;
  --clay: #C97B55;
  --moss: #6FA07A;
  --paper: #F1EDE3;
  --mist: #A6ADC0;

  --shell: 1240px;
  --measure: 36em;
  --pill: 999px;
  --r-l: 28px;
  --r-m: 20px;
  --r-s: 14px;

  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB",
    "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;
  --font-mono: ui-monospace, "JetBrains Mono", "SFMono-Regular", Menlo, Consolas, monospace;

  --ease: cubic-bezier(.22, .7, .24, 1);
  --shadow-card: 0 18px 44px rgba(2, 4, 10, .55);
}

/* 3. 基础排版 ---------------------------------------------- */
body {
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .005em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
}
body::before {
  content: "";
  position: fixed;
  inset: 0;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(920px 640px at 78% -10%, rgba(164, 104, 255, .16), transparent 62%),
    radial-gradient(760px 540px at 4% 8%, rgba(73, 214, 232, .12), transparent 60%),
    radial-gradient(720px 700px at 50% 112%, rgba(201, 123, 85, .12), transparent 66%);
}
h1, h2, h3, h4 { font-weight: 700; line-height: 1.22; }
p { margin: 0 0 1.05em; }
a { text-decoration: none; }
p a, li a { color: var(--gold); }
p a:hover, li a:hover { color: var(--cyan); }
strong { color: var(--paper); }
::selection { background: rgba(228, 192, 112, .3); color: #fff; }

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 6px;
}

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0; border: 0;
  clip: rect(0 0 0 0); clip-path: inset(50%);
  overflow: hidden; white-space: nowrap;
}
.mono-num { font-family: var(--font-mono); letter-spacing: .06em; }

/* 跳至主要内容 */
.skip-link {
  position: fixed;
  left: 16px;
  top: -72px;
  z-index: 200;
  padding: 10px 20px;
  border-radius: var(--pill);
  background: var(--gold);
  color: #160F04;
  font-weight: 700;
  font-size: 14px;
  transition: top .28s var(--ease);
}
.skip-link:focus { top: 12px; }

/* 4. 布局容器与章节 ---------------------------------------- */
.shell {
  width: 100%;
  max-width: var(--shell);
  margin-inline: auto;
  padding-inline: 24px;
}
.section { position: relative; padding: clamp(56px, 8vw, 118px) 0; }
.section--plate {
  background: linear-gradient(180deg, rgba(17, 21, 36, .88), rgba(17, 21, 36, .52));
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.section--edge::before {
  content: "";
  position: absolute;
  left: 0; right: 0; top: -1px;
  height: 2px;
  background: linear-gradient(90deg, transparent, rgba(228, 192, 112, .6), rgba(73, 214, 232, .42), transparent);
}
.section > .shell { position: relative; z-index: 1; }

.aurora {
  position: absolute;
  z-index: 0;
  pointer-events: none;
  border-radius: 50%;
  filter: blur(62px);
  opacity: .5;
}
.aurora--gold { background: radial-gradient(circle, rgba(228, 192, 112, .5), transparent 70%); }
.aurora--violet { background: radial-gradient(circle, rgba(164, 104, 255, .45), transparent 70%); }
.aurora--cyan { background: radial-gradient(circle, rgba(73, 214, 232, .4), transparent 70%); }

/* 5. 文字建筑 ---------------------------------------------- */
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 16px;
}
.eyebrow::before {
  content: "";
  width: 26px; height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent);
}
.display {
  font-size: clamp(38px, 6vw, 84px);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -.02em;
  text-shadow: 0 0 24px rgba(228, 192, 112, .28);
}
.headline {
  font-size: clamp(24px, 3vw, 40px);
  font-weight: 700;
  line-height: 1.2;
}
.lede {
  max-width: var(--measure);
  font-size: clamp(17px, 1.4vw, 20px);
  color: var(--mist);
}
.prose { max-width: var(--measure); }
.prose p { margin-bottom: 1.15em; }
.prose h2 { font-size: clamp(20px, 2.2vw, 26px); margin: 1.8em 0 .6em; }
.prose h3 { font-size: 18px; margin: 1.5em 0 .5em; color: var(--paper); }
.prose ul, .prose ol { padding-left: 1.3em; margin: 0 0 1.2em; }
.prose li { margin-bottom: .5em; color: var(--mist); }

/* 6. 按钮与胶囊 -------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 24px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-size: 15px;
  font-weight: 700;
  line-height: 1;
  cursor: pointer;
  background: transparent;
  transition: transform .3s var(--ease), box-shadow .3s var(--ease), background .3s var(--ease), border-color .3s var(--ease), color .3s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn--gold {
  background: linear-gradient(120deg, var(--gold), var(--gold-deep));
  color: #160F04;
  box-shadow: 0 14px 34px rgba(228, 192, 112, .2);
}
.btn--gold:hover { box-shadow: 0 18px 40px rgba(228, 192, 112, .32); }
.btn--ghost {
  border-color: var(--line);
  background: rgba(17, 21, 36, .6);
  color: var(--paper);
}
.btn--ghost:hover { border-color: var(--gold); color: var(--gold); }
.btn--cyan {
  border-color: rgba(73, 214, 232, .45);
  color: var(--cyan);
  background: rgba(73, 214, 232, .08);
}
.btn--cyan:hover { background: rgba(73, 214, 232, .16); }

.chip-row { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  padding: 8px 15px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: transparent;
  color: var(--mist);
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .08em;
  cursor: pointer;
  transition: color .25s var(--ease), border-color .25s var(--ease), background .25s var(--ease);
}
.chip:hover { color: var(--paper); border-color: rgba(164, 104, 255, .5); }
.chip[aria-pressed="true"] {
  color: var(--paper);
  border-color: var(--violet);
  background: rgba(164, 104, 255, .14);
}

/* 7. 面包屑 ------------------------------------------------ */
.crumbs {
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--mist);
}
.crumbs ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; color: var(--line); }
.crumbs a { color: var(--mist); }
.crumbs a:hover { color: var(--gold); }
.crumbs [aria-current="page"] { color: var(--paper); }

/* 8. 网格与卡片 -------------------------------------------- */
.grid { display: grid; gap: clamp(16px, 2vw, 24px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }

.card {
  position: relative;
  padding: clamp(20px, 2.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background: linear-gradient(160deg, rgba(17, 21, 36, .96), rgba(17, 21, 36, .7));
  transition: transform .35s var(--ease), border-color .35s var(--ease), box-shadow .35s var(--ease);
}
.card:hover {
  transform: translateY(-4px);
  border-color: rgba(228, 192, 112, .45);
  box-shadow: var(--shadow-card);
}
.card--wide { grid-column: span 2; }
.card--tall { grid-row: span 2; }
.card-title { font-size: 19px; font-weight: 700; margin-bottom: 8px; }
.card-body { color: var(--mist); font-size: 15px; margin: 0; }

.tag {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid rgba(164, 104, 255, .45);
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--violet);
}

.note {
  padding: 16px 18px 16px 20px;
  border-left: 3px solid var(--clay);
  border-radius: 0 var(--r-s) var(--r-s) 0;
  background: rgba(201, 123, 85, .1);
  color: var(--paper);
  font-size: 15px;
}
.note--amber { border-left-color: var(--amber); background: rgba(255, 138, 61, .12); }

.stat { display: grid; gap: 4px; }
.stat-value {
  font-family: var(--font-mono);
  font-size: clamp(28px, 3.4vw, 42px);
  letter-spacing: .02em;
  color: var(--gold);
}
.stat-label { font-size: 13.5px; color: var(--mist); }

/* 9. 索引列表 / 步骤树 / 手风琴 ---------------------------- */
.index-list {
  list-style: none;
  counter-reset: idx;
  margin: 0;
  padding: 0;
  display: grid;
}
.index-list li {
  counter-increment: idx;
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}
.index-list li::before {
  content: counter(idx, decimal-leading-zero);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--gold);
  padding-top: 4px;
}

.steps {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}
.steps::before {
  content: "";
  position: absolute;
  left: 17px; top: 16px; bottom: 16px;
  width: 2px;
  background: linear-gradient(180deg, var(--gold), var(--cyan) 55%, rgba(73, 214, 232, 0));
}
.step { position: relative; padding-left: 58px; }
.step-num {
  position: absolute;
  left: 0; top: 0;
  width: 36px; height: 36px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: linear-gradient(140deg, var(--gold), var(--gold-deep));
  color: #160F04;
  font-family: var(--font-mono);
  font-size: 13px;
  box-shadow: 0 0 0 4px rgba(7, 10, 20, .92);
}
.step--amber .step-num { background: linear-gradient(140deg, var(--amber), #C2601F); color: #1A0C02; }
.step-title { margin: 6px 0 6px; font-size: 17px; font-weight: 700; }
.step-body { margin: 0; color: var(--mist); font-size: 15px; }

.acc {
  border: 1px solid var(--line);
  border-radius: var(--r-m);
  background: linear-gradient(150deg, rgba(17, 21, 36, .95), rgba(17, 21, 36, .68));
  overflow: hidden;
}
.acc + .acc { margin-top: 12px; }
.acc summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px 20px;
  font-size: 16px;
  font-weight: 700;
  list-style: none;
  transition: color .25s var(--ease), background .25s var(--ease);
}
.acc summary::-webkit-details-marker { display: none; }
.acc summary::after {
  content: "";
  margin-left: auto;
  width: 11px; height: 11px;
  border-right: 2px solid var(--gold);
  border-bottom: 2px solid var(--gold);
  transform: rotate(45deg);
  transition: transform .3s var(--ease);
}
.acc[open] summary { color: var(--gold); background: rgba(228, 192, 112, .06); }
.acc[open] summary::after { transform: rotate(-135deg); }
.acc-idx { font-family: var(--font-mono); font-size: 12.5px; color: var(--violet); letter-spacing: .1em; }
.acc-body { padding: 0 20px 20px; font-size: 15px; color: var(--mist); }

/* 10. 图片容器基础规则（页面阶段直接套用） ------------------ */
.media-frame {
  position: relative;
  display: block;
  isolation: isolate;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--r-l);
  background: linear-gradient(140deg, #0B0F1E, #141A2C);
  aspect-ratio: 16 / 9;
}
.media-frame > img {
  width: 100%; height: 100%;
  object-fit: cover;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(180deg, rgba(7, 10, 20, 0) 44%, rgba(7, 10, 20, .74) 100%);
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--focus::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(58% 58% at 50% 44%, rgba(228, 192, 112, .2), transparent 72%);
}
.media-fallback {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: rgba(166, 173, 192, .5);
}

/* ============================================================
   11. 头部：紧凑命令栏
   ============================================================ */
.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.5vw, 22px);
  padding-block: 14px;
  padding-inline: max(16px, calc((100% - var(--shell)) / 2 + 24px));
  background: linear-gradient(180deg, rgba(7, 10, 20, .96), rgba(7, 10, 20, .8));
  border-bottom: 1px solid rgba(44, 49, 66, .8);
  transition: padding-block .4s var(--ease), background .4s var(--ease), border-color .4s var(--ease);
}
.site-header::after {
  content: "";
  position: absolute;
  top: 8px;
  bottom: 8px;
  left: max(10px, calc((100% - var(--shell)) / 2));
  right: max(10px, calc((100% - var(--shell)) / 2));
  z-index: -1;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(11, 14, 26, .9);
  box-shadow: 0 18px 44px rgba(2, 4, 10, .6);
  backdrop-filter: blur(16px) saturate(150%);
  opacity: 0;
  pointer-events: none;
  transition: opacity .35s var(--ease);
}
.site-header[data-scrolled] {
  padding-block: 8px;
  background: transparent;
  border-bottom-color: transparent;
}
.site-header[data-scrolled]::after { opacity: 1; }

/* 品牌 */
.brand {
  display: inline-flex;
  flex-direction: column;
  gap: 1px;
  flex: 0 0 auto;
}
.brand-mark {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: .02em;
  color: var(--paper);
}
.brand-mark::before {
  content: "";
  width: 7px; height: 7px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 10px rgba(228, 192, 112, .8);
}
.brand:hover .brand-mark { color: var(--gold); }
.brand-sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--mist);
}

/* 命令栏导航 */
.command-nav {
  display: flex;
  align-items: center;
  gap: 4px;
  margin-left: auto;
  min-width: 0;
}
.cmd-list {
  display: flex;
  align-items: center;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}
.cmd-item { min-width: 0; }
.cmd-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 9px 12px;
  border-radius: var(--pill);
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1;
  white-space: nowrap;
  transition: color .25s var(--ease), background .25s var(--ease);
}
.cmd-index {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: rgba(166, 173, 192, .6);
  transition: color .25s var(--ease);
}
.cmd-link:hover { color: var(--paper); background: rgba(164, 104, 255, .1); }
.cmd-link[aria-current="page"] { color: var(--gold); }
.cmd-link[aria-current="page"] .cmd-index { color: var(--gold-deep); }
.cmd-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px; right: 12px; bottom: 3px;
  height: 2px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(228, 192, 112, 0));
}
.cmd-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 6px; right: 6px;
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 8px rgba(111, 160, 122, .9);
}
.cmd-extra {
  display: flex;
  align-items: center;
  gap: 6px;
  margin-left: 10px;
  padding-left: 12px;
  border-left: 1px solid var(--line);
}
.cmd-tool {
  padding: 7px 10px;
  border: 1px solid transparent;
  border-radius: var(--pill);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .1em;
  color: var(--mist);
  white-space: nowrap;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}
.cmd-tool:hover { color: var(--paper); border-color: var(--line); }
.cmd-meta {
  display: none;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--mist);
}

/* 头部动作区 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
  margin-left: 10px;
}
.cta-pill {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 11px 20px;
  border-radius: var(--pill);
  background: linear-gradient(120deg, var(--gold), var(--gold-deep));
  color: #160F04;
  font-size: 14.5px;
  font-weight: 700;
  line-height: 1;
  white-space: nowrap;
  overflow: hidden;
  box-shadow: 0 0 0 1px rgba(228, 192, 112, .4), 0 12px 30px rgba(228, 192, 112, .18);
  transition: transform .3s var(--ease), box-shadow .3s var(--ease);
}
.cta-pill:hover { transform: translateY(-2px); box-shadow: 0 0 0 1px rgba(228, 192, 112, .6), 0 18px 38px rgba(228, 192, 112, .28); }
.cta-pill::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(105deg, transparent 30%, rgba(255, 255, 255, .55) 50%, transparent 70%);
  transform: translateX(-130%);
  animation: sweep 3.2s var(--ease) infinite;
  pointer-events: none;
}
.cta-arrow { font-family: var(--font-mono); }
@keyframes sweep {
  0% { transform: translateX(-130%); }
  55% { transform: translateX(130%); }
  100% { transform: translateX(130%); }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 8px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(17, 21, 36, .85);
  color: var(--paper);
  font-size: 13px;
  line-height: 1;
  cursor: pointer;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}
.nav-toggle:hover { border-color: var(--gold); color: var(--gold); }
.nav-toggle-icon {
  position: relative;
  width: 14px; height: 10px;
  flex: 0 0 auto;
}
.nav-toggle-icon::before,
.nav-toggle-icon::after {
  content: "";
  position: absolute;
  left: 0; right: 0;
  height: 1.5px;
  border-radius: 2px;
  background: currentColor;
  transition: transform .3s var(--ease), top .3s var(--ease);
}
.nav-toggle-icon::before { top: 1px; }
.nav-toggle-icon::after { top: 7px; }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::before { top: 4px; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-icon::after { top: 4px; transform: rotate(-45deg); }

/* 滚动进度轨 */
.scroll-rail {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  height: 2px;
  overflow: hidden;
  background: rgba(44, 49, 66, .55);
}
.scroll-rail-fill {
  display: block;
  width: 100%; height: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--gold), var(--cyan) 58%, var(--violet));
}

/* ============================================================
   12. 页脚：矿物色收束层
   ============================================================ */
.site-footer {
  position: relative;
  margin-top: clamp(48px, 7vw, 96px);
  padding: clamp(48px, 6vw, 84px) 0 calc(30px + env(safe-area-inset-bottom));
  background: linear-gradient(180deg, #0A0E1C 0%, #0C1120 62%, #0A0E19 100%);
  border-top: 1px solid rgba(44, 49, 66, .85);
  overflow: hidden;
}
.site-footer::before {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    radial-gradient(760px 380px at 10% 0%, rgba(201, 123, 85, .18), transparent 66%),
    radial-gradient(680px 340px at 88% 6%, rgba(111, 160, 122, .16), transparent 62%),
    linear-gradient(115deg, rgba(228, 192, 112, .08) 0%, transparent 40%, rgba(73, 214, 232, .07) 100%);
}
.footer-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 2fr);
  gap: clamp(28px, 4vw, 64px);
  align-items: start;
}
.footer-brand { min-width: 0; }
.footer-mark {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--paper);
}
.footer-mark::after {
  content: "";
  display: block;
  width: 46px; height: 2px;
  margin-top: 12px;
  border-radius: 2px;
  background: linear-gradient(90deg, var(--gold), var(--clay), transparent);
}
.footer-sub {
  margin: 12px 0 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mist);
}
.footer-note {
  margin: 14px 0 0;
  max-width: 28em;
  font-size: 14px;
  color: var(--mist);
}
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 36px);
}
.footer-col { min-width: 0; }
.footer-col-title {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .18em;
  color: var(--gold);
}
.footer-col-title::before {
  content: "";
  width: 5px; height: 5px;
  border-radius: 50%;
  background: var(--clay);
}
.footer-links {
  display: grid;
  gap: 11px;
  list-style: none;
  margin: 0;
  padding: 0;
}
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14.5px;
  color: var(--mist);
  transition: color .25s var(--ease);
}
.footer-link::before {
  content: "";
  width: 5px; height: 5px;
  flex: 0 0 auto;
  border-radius: 50%;
  background: var(--line);
  transition: background .25s var(--ease), box-shadow .25s var(--ease);
}
.footer-link:hover { color: var(--paper); }
.footer-link:hover::before { background: var(--gold); box-shadow: 0 0 9px rgba(228, 192, 112, .9); }

.footer-rule {
  position: relative;
  z-index: 1;
  display: block;
  height: 1px;
  margin-top: clamp(32px, 4vw, 56px);
  background: linear-gradient(90deg, transparent, rgba(228, 192, 112, .55) 22%, rgba(73, 214, 232, .38) 60%, transparent);
}
.footer-meta {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 10px;
  padding-top: 22px;
}
.footer-contact {
  margin: 0;
  font-size: 15px;
  color: var(--paper);
}
.footer-address {
  margin: 0;
  font-size: 14px;
  color: var(--mist);
}
.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--mist);
}
.footer-footnote {
  margin: 0;
  font-size: 13px;
  color: rgba(166, 173, 192, .75);
}

/* ============================================================
   13. 滚动显现
   ============================================================ */
[data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ============================================================
   14. 响应式：平板 / 手机
   ============================================================ */
@media (max-width: 1080px) {
  .cmd-link { padding: 8px 9px; font-size: 14px; }
  .cmd-index { font-size: 10.5px; }
  .cmd-extra { margin-left: 6px; padding-left: 8px; }
  .cta-pill { padding: 10px 16px; font-size: 14px; }
}

@media (max-width: 900px) {
  body { padding-bottom: calc(112px + env(safe-area-inset-bottom)); }

  .site-header,
  .site-header[data-scrolled] {
    padding-block: 10px;
    padding-inline: 16px;
    gap: 10px;
    background: linear-gradient(180deg, rgba(7, 10, 20, .97), rgba(7, 10, 20, .9));
    border-bottom-color: rgba(44, 49, 66, .9);
  }
  .site-header::after,
  .site-header[data-scrolled]::after { display: none; }
  .brand { margin-right: auto; }
  .brand-mark { font-size: 16px; }
  .brand-sub { font-size: 10px; }
  .nav-toggle { display: inline-flex; }

  /* 命令栏转为底部悬浮码头 */
  .command-nav {
    position: fixed;
    left: 12px;
    right: 12px;
    bottom: calc(10px + env(safe-area-inset-bottom));
    z-index: 90;
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    margin: 0;
    padding: 10px;
    max-height: min(72vh, 540px);
    overflow-y: auto;
    border: 1px solid var(--line);
    border-radius: 26px;
    background: rgba(11, 14, 26, .95);
    backdrop-filter: blur(18px) saturate(150%);
    box-shadow: 0 24px 60px rgba(2, 4, 10, .72);
  }
  .cmd-list {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 6px;
  }
  .cmd-link {
    flex-direction: column;
    align-items: center;
    gap: 3px;
    padding: 9px 4px;
    border: 1px solid rgba(44, 49, 66, .7);
    border-radius: 18px;
    background: rgba(17, 21, 36, .72);
    font-size: 13px;
  }
  .cmd-index { display: none; }
  .cmd-link[aria-current="page"] {
    border-color: rgba(228, 192, 112, .5);
    background: rgba(228, 192, 112, .12);
  }
  .cmd-link[aria-current="page"]::after { left: 16px; right: 16px; bottom: 4px; }
  .cmd-link[aria-current="page"]::before { top: 5px; right: 5px; }

  .command-nav .cmd-extra,
  .command-nav .cmd-meta { display: none; }
  .command-nav[data-open] { padding: 14px; border-radius: 24px; }
  .command-nav[data-open] .cmd-list { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 8px; }
  .command-nav[data-open] .cmd-link {
    flex-direction: row;
    align-items: center;
    padding: 12px 10px;
    font-size: 14px;
  }
  .command-nav[data-open] .cmd-index { display: inline; }
  .command-nav[data-open] .cmd-extra {
    display: flex;
    flex-wrap: wrap;
    gap: 8px;
    margin: 0;
    padding: 12px 0 0;
    border-left: 0;
    border-top: 1px solid var(--line);
  }
  .command-nav[data-open] .cmd-tool {
    border-color: var(--line);
    color: var(--paper);
  }
  .command-nav[data-open] .cmd-meta { display: block; }

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

@media (max-width: 640px) {
  .shell { padding-inline: 18px; }
  .grid--2, .grid--3 { grid-template-columns: 1fr; }
  .card--wide { grid-column: auto; }
  .card--tall { grid-row: auto; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 22px 16px; }
  .cta-pill { padding: 9px 13px; font-size: 13px; }
  .nav-toggle { padding: 8px 12px; font-size: 12.5px; }
  .index-list li { grid-template-columns: 44px minmax(0, 1fr); gap: 12px; }
  .step { padding-left: 50px; }
}

@media (max-width: 480px) {
  .brand-sub { display: none; }
  .nav-toggle-label { display: none; }
  .nav-toggle { padding: 9px 11px; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

/* ============================================================
   15. 动效降级
   ============================================================ */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    transition-delay: 0ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .cta-pill::after { display: none; }
  .card:hover, .btn:hover, .cta-pill:hover { transform: none; }
}