/* ===========================================================
   金都服务端 · 共享站点样式 /assets/site.css
   深靛蓝档案库 + 数字港口：粗边框、硬阴影、斜切角、鎏金锚点
   =========================================================== */

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

:root {
  --ink-900: #0A1430;
  --ink-800: #101E3F;
  --ink-700: #17294F;
  --line-600: #2B3B60;
  --warm-100: #F4F1E8;
  --gold-500: #D9A441;
  --gold-300: #F0CD84;
  --celadon-400: #6FB39C;
  --celadon-200: #A8D6C7;
  --slate-400: #93A0BE;

  --font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", system-ui, sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "SFMono-Regular", Consolas, monospace;

  --header-h: 78px;
  --header-h-sm: 62px;
  --rail-w: 232px;

  --gap: clamp(16px, 2.4vw, 28px);
  --edge: clamp(16px, 4vw, 48px);

  --shadow-hard: 6px 6px 0 rgba(4, 9, 28, 0.9);
  --shadow-gold: 6px 6px 0 rgba(217, 164, 65, 0.3);
  --ease: cubic-bezier(.2, .8, .2, 1);
  --dur: 180ms;
}

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 24px);
  background: var(--ink-900);
}

body, h1, h2, h3, h4, h5, p, ul, ol, li, figure, blockquote, dl, dd, table { margin: 0; }
ul, ol { padding: 0; list-style: none; }
button { font: inherit; color: inherit; background: none; border: 0; cursor: pointer; }
a { color: inherit; text-decoration: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
table { border-collapse: collapse; width: 100%; }

body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: clamp(15px, 1.05vw, 17px);
  line-height: 1.85;
  color: var(--warm-100);
  background-color: var(--ink-900);
  background-image:
    linear-gradient(rgba(43, 59, 96, 0.26) 1px, transparent 1px),
    linear-gradient(90deg, rgba(43, 59, 96, 0.26) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}

:focus-visible { outline: 3px solid var(--gold-300); outline-offset: 3px; }

/* ---------- 排版 ---------- */
h1, h2, h3, h4, h5 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--warm-100);
}
h1 { font-size: clamp(2.4rem, 6vw, 5rem); letter-spacing: -0.02em; }
h2 { font-size: clamp(1.55rem, 3.2vw, 2.5rem); }
h3 { font-size: clamp(1.12rem, 1.8vw, 1.5rem); }
h4 { font-size: 1rem; }

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

.prose { max-width: 68ch; color: rgba(244, 241, 232, 0.86); }
.prose p + p { margin-top: 1em; }
.prose strong { color: var(--gold-300); font-weight: 700; }
.prose a { color: var(--gold-300); border-bottom: 1px solid rgba(240, 205, 132, 0.5); }
.prose a:hover { color: var(--gold-500); border-bottom-color: var(--gold-500); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold-500);
}
.eyebrow::before {
  content: "";
  width: 18px;
  height: 2px;
  background: var(--gold-500);
}

/* ---------- 骨架 ---------- */
.container { width: min(1280px, 100% - 2 * var(--edge)); margin-inline: auto; }
.container--wide { width: min(1440px, 100% - 2 * clamp(16px, 3vw, 40px)); margin-inline: auto; }

.site-main { display: block; padding-top: calc(var(--header-h) + clamp(20px, 4vw, 44px)); padding-bottom: clamp(40px, 6vw, 88px); }
.site-main--overlay { padding-top: 0; }

.shell {
  display: grid;
  grid-template-columns: var(--rail-w) minmax(0, 1fr);
  gap: clamp(24px, 3.2vw, 56px);
  align-items: start;
}

.section { padding-block: clamp(30px, 5vw, 72px); }
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: clamp(12px, 2vw, 28px);
  padding-bottom: 16px;
  margin-bottom: clamp(20px, 3vw, 36px);
  border-bottom: 2px solid var(--line-600);
}

.grid-12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(16px, 2vw, 28px); }
.col-main { grid-column: 1 / span 7; }
.col-aside { grid-column: 9 / span 4; }

/* ---------- 跳链 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 320;
  padding: 10px 18px;
  font-weight: 700;
  color: var(--ink-900);
  background: var(--gold-500);
  border: 2px solid var(--ink-900);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 14px; }

/* ---------- 头部 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 300;
  color: var(--warm-100);
  background: transparent;
  transition: background-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}
.site-header::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 2px;
  background: linear-gradient(90deg, rgba(43, 59, 96, 0.9), rgba(43, 59, 96, 0.2));
}
.site-header[data-scrolled] {
  background: var(--ink-900);
  box-shadow: 0 18px 40px rgba(4, 9, 28, 0.62);
}
.site-header[data-nav-open] { background: var(--ink-900); }

.site-header__inner {
  position: relative;
  width: min(1440px, 100% - 2 * clamp(16px, 3vw, 40px));
  margin-inline: auto;
  min-height: var(--header-h);
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 32px);
  transition: min-height var(--dur) var(--ease);
}
.site-header[data-scrolled] .site-header__inner { min-height: var(--header-h-sm); }

.site-header__progress {
  position: absolute;
  left: 0;
  bottom: 0;
  z-index: 4;
  width: 100%;
  height: 3px;
  background: var(--gold-500);
  transform: scaleX(0);
  transform-origin: 0 50%;
  will-change: transform;
}

/* 品牌 */
.brand { display: flex; align-items: center; gap: 12px; flex: 0 0 auto; padding: 6px 0; }
.brand__mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--gold-500);
  border: 2px solid var(--gold-500);
  background: linear-gradient(135deg, rgba(217, 164, 65, 0.18), rgba(10, 20, 48, 0.2));
  clip-path: polygon(0 0, 100% 0, 100% 70%, 70% 100%, 0 100%);
  transition: width var(--dur) var(--ease), height var(--dur) var(--ease);
}
.site-header[data-scrolled] .brand__mark { width: 36px; height: 36px; }
.brand__text { display: flex; flex-direction: column; gap: 1px; line-height: 1.22; }
.brand__name {
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 800;
  letter-spacing: 0.03em;
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--slate-400);
}

/* 主导航 */
.site-nav { margin-inline: auto; }
.site-nav__list { display: flex; align-items: center; gap: clamp(6px, 1.5vw, 22px); }
.site-nav__item { position: relative; }
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 2px;
  font-size: 0.92rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: rgba(244, 241, 232, 0.86);
  transition: color var(--dur) var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 2px;
  background: var(--gold-500);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform var(--dur) var(--ease);
}
.site-nav__link:hover { color: var(--gold-300); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--gold-500); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.site-nav__quick { display: none; }
.site-nav__quick-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate-400);
}

/* 桌面行动区 */
.header-actions { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }

/* 汉堡按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding: 9px 13px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--warm-100);
  border: 2px solid var(--line-600);
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--gold-500); color: var(--gold-300); }
.nav-toggle__bars { position: relative; display: block; width: 18px; height: 2px; background: currentColor; transition: background-color var(--dur) var(--ease); }
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  background: currentColor;
  transition: transform var(--dur) var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] { border-color: var(--gold-500); color: var(--gold-500); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 0.68em 1.25em;
  font-family: var(--font-body);
  font-size: 0.92rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  line-height: 1.3;
  border: 2px solid transparent;
  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--gold {
  color: var(--ink-900);
  background: var(--gold-500);
  border-color: var(--gold-500);
  box-shadow: 4px 4px 0 rgba(4, 9, 28, 0.75);
}
.btn--gold:hover { background: var(--gold-300); border-color: var(--gold-300); transform: translate(-1px, -1px); box-shadow: 6px 6px 0 rgba(4, 9, 28, 0.75); }
.btn--ghost {
  color: var(--warm-100);
  background: rgba(16, 30, 63, 0.55);
  border-color: var(--line-600);
}
.btn--ghost:hover { color: var(--gold-300); border-color: var(--gold-500); background: rgba(23, 41, 79, 0.85); }
.btn--sm { padding: 0.5em 0.95em; font-size: 0.84rem; }
.btn--block { width: 100%; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 18px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--slate-400);
}
.breadcrumb__sep { color: var(--line-600); }
.breadcrumb__item a:hover { color: var(--gold-300); }
.breadcrumb__item[aria-current="page"] { color: var(--gold-300); }

/* ---------- 左侧功能索引 ---------- */
.rail {
  position: sticky;
  top: calc(var(--header-h) + 28px);
  padding-left: 18px;
  border-left: 2px solid var(--line-600);
}
.rail__title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--slate-400);
}
.rail__list { display: grid; gap: 2px; }
.rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 8px 9px 0;
  font-size: 0.9rem;
  color: var(--slate-400);
  border-bottom: 1px dashed rgba(43, 59, 96, 0.6);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.rail__link:hover { color: var(--warm-100); transform: translateX(3px); }
.rail__num { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.06em; color: var(--gold-500); }
.rail__link[aria-current="true"] { color: var(--gold-300); }
.rail__link[aria-current="true"] .rail__num { color: var(--gold-300); }

/* ---------- 档案卡 / 步骤 / 标签 / 旁注 ---------- */
.card {
  position: relative;
  padding: clamp(16px, 2.2vw, 26px);
  background: var(--ink-700);
  border: 2px solid var(--line-600);
  box-shadow: var(--shadow-hard);
}
.card--link { display: block; transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), box-shadow var(--dur) var(--ease); }
.card--link:hover { transform: translate(-2px, -2px); border-color: var(--gold-500); box-shadow: var(--shadow-gold); }
.card__title { margin-bottom: 8px; font-family: var(--font-display); font-size: 1.14rem; font-weight: 800; }
.card__meta { font-family: var(--font-mono); font-size: 0.72rem; letter-spacing: 0.08em; color: var(--slate-400); }

.step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: clamp(14px, 2vw, 24px);
  padding: clamp(16px, 2.4vw, 26px);
  background: var(--ink-700);
  border: 2px solid var(--line-600);
  border-left: 6px solid var(--gold-500);
  box-shadow: var(--shadow-hard);
}
.step__num { font-family: var(--font-mono); font-size: clamp(1.35rem, 2.6vw, 2.1rem); font-weight: 700; line-height: 1; color: var(--gold-500); }
.step__body { min-width: 0; }
.step--done { border-left-color: var(--celadon-400); }
.step--done .step__num { color: var(--celadon-400); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--slate-400);
  background: rgba(23, 41, 79, 0.6);
  border: 1px solid var(--line-600);
}
.tag--gold { color: var(--gold-300); border-color: var(--gold-500); background: rgba(217, 164, 65, 0.1); }
.tag--celadon { color: var(--celadon-200); border-color: var(--celadon-400); background: rgba(111, 179, 156, 0.1); }

.note {
  padding: 14px 18px;
  font-size: 0.92rem;
  color: rgba(244, 241, 232, 0.82);
  background: var(--ink-800);
  border-left: 3px solid var(--gold-500);
}
.note strong { color: var(--gold-300); }

/* ---------- 图片占位容器 ---------- */
.media {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  background: var(--ink-700);
  border: 2px solid var(--line-600);
}
.media::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(135deg, rgba(111, 179, 156, 0.16), transparent 46%),
    linear-gradient(315deg, rgba(217, 164, 65, 0.14), transparent 58%);
}
.media > img { width: 100%; height: 100%; object-fit: cover; }
.media--wide { aspect-ratio: 16 / 9; }
.media--square { aspect-ratio: 1 / 1; }
.media--tall { aspect-ratio: 4 / 5; }
.media--cut { clip-path: polygon(0 0, 100% 0, 100% calc(100% - 46px), calc(100% - 46px) 100%, 0 100%); }

/* ---------- 横向轨道与表格 ---------- */
.track {
  display: flex;
  gap: clamp(14px, 2vw, 22px);
  padding: 6px 4px 18px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.track > * { flex: 0 0 clamp(240px, 32vw, 340px); scroll-snap-align: start; }
.track::-webkit-scrollbar { height: 8px; }
.track::-webkit-scrollbar-track { background: var(--ink-800); }
.track::-webkit-scrollbar-thumb { background: var(--line-600); }
.track::-webkit-scrollbar-thumb:hover { background: var(--gold-500); }

.table-scroll {
  overflow-x: auto;
  background: var(--ink-800);
  border: 2px solid var(--line-600);
}
.table-scroll table { min-width: 640px; }
.table-scroll th,
.table-scroll td {
  padding: 12px 16px;
  text-align: left;
  font-size: 0.92rem;
  white-space: nowrap;
  border-bottom: 1px solid var(--line-600);
}
.table-scroll thead th {
  font-family: var(--font-mono);
  font-size: 0.72rem;
  font-weight: 500;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--slate-400);
  background: var(--ink-700);
}
.table-scroll tbody tr { transition: background-color var(--dur) var(--ease); }
.table-scroll tbody tr:hover { background: rgba(217, 164, 65, 0.08); }
.table-scroll tbody tr[aria-selected="true"] { background: rgba(111, 179, 156, 0.12); }
.table-scroll td .mono { color: var(--gold-300); }

/* ---------- 分段标签页 ---------- */
.tabs__list {
  display: flex;
  gap: 6px;
  margin-bottom: clamp(16px, 2.4vw, 28px);
  overflow-x: auto;
  border-bottom: 2px solid var(--line-600);
}
.tabs__tab {
  padding: 10px 16px;
  font-size: 0.92rem;
  font-weight: 700;
  white-space: nowrap;
  color: var(--slate-400);
  border: 2px solid transparent;
  border-bottom: 0;
  transition: color var(--dur) var(--ease), background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.tabs__tab:hover { color: var(--warm-100); }
.tabs__tab[aria-selected="true"] {
  color: var(--gold-500);
  background: var(--ink-800);
  border-color: var(--line-600);
  box-shadow: inset 0 2px 0 var(--gold-500);
}
.tabs__panel[hidden] { display: none; }
.tabs__panel { animation: kit-fade var(--dur) var(--ease); }
@keyframes kit-fade {
  from { opacity: 0; transform: translateY(8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 手风琴 ---------- */
.faq__item {
  margin-bottom: 10px;
  background: var(--ink-800);
  border: 2px solid var(--line-600);
}
.faq__item[open] { border-color: var(--gold-500); }
.faq__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  font-weight: 700;
  cursor: pointer;
  list-style: none;
}
.faq__summary::-webkit-details-marker { display: none; }
.faq__summary::after { content: "+"; font-family: var(--font-mono); color: var(--gold-500); }
.faq__item[open] .faq__summary::after { content: "–"; }
.faq__body { padding: 0 18px 18px; color: rgba(244, 241, 232, 0.82); }

/* ---------- 提示条 ---------- */
.toast {
  position: fixed;
  left: 50%;
  bottom: 28px;
  z-index: 420;
  padding: 10px 18px;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--warm-100);
  background: var(--ink-700);
  border: 2px solid var(--gold-500);
  opacity: 0;
  pointer-events: none;
  transform: translate(-50%, 16px);
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.toast.is-open { opacity: 1; transform: translate(-50%, 0); }

/* ---------- 进入显现 ---------- */
html.js [data-reveal] { opacity: 0; transform: translateY(12px); }
html.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease);
}

/* ---------- 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 8vw, 120px);
  color: var(--warm-100);
  background: var(--ink-800);
  border-top: 2px solid var(--line-600);
}
.site-footer__inner {
  width: min(1440px, 100% - 2 * clamp(16px, 3vw, 40px));
  margin-inline: auto;
  padding-top: clamp(40px, 6vw, 72px);
  padding-bottom: 0;
}
.site-footer__grid {
  display: grid;
  grid-template-columns: minmax(210px, 1.3fr) repeat(3, minmax(110px, 0.8fr)) minmax(240px, 1.5fr);
  gap: clamp(24px, 3vw, 48px);
  padding-bottom: clamp(32px, 5vw, 56px);
}
.site-footer__brand { display: grid; gap: 12px; align-content: start; justify-items: start; }
.site-footer__name {
  position: relative;
  padding-top: 14px;
  font-family: var(--font-display);
  font-size: clamp(1.5rem, 2.4vw, 2rem);
  font-weight: 800;
  letter-spacing: 0.02em;
}
.site-footer__name::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 46px;
  height: 4px;
  background: var(--gold-500);
}
.site-footer__sub { font-size: 0.86rem; color: rgba(244, 241, 232, 0.72); }
.site-footer__meta {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.14em;
  color: var(--slate-400);
}
.site-footer__brand .btn { margin-top: 4px; }

.footer-col { display: grid; gap: 14px; align-content: start; }
.footer-col__title {
  display: flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold-500);
}
.footer-col__title::before {
  content: "";
  width: 7px;
  height: 7px;
  background: var(--gold-500);
  transform: rotate(45deg);
}
.footer-col__list { display: grid; gap: 2px; }
.footer-col__link {
  display: inline-block;
  padding: 5px 0;
  font-size: 0.92rem;
  color: rgba(244, 241, 232, 0.8);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.footer-col__link:hover { color: var(--gold-300); transform: translateX(3px); }

.footer-contact { display: grid; gap: 14px; align-content: start; }
.footer-contact__list { display: grid; gap: 10px; }
.footer-contact__item { display: grid; gap: 2px; }
.footer-contact__label {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--slate-400);
}
.footer-contact__value {
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--warm-100);
  word-break: break-word;
}
.footer-contact__value.mono { font-size: 0.84rem; color: var(--gold-300); }
.footer-contact__note {
  padding-left: 12px;
  font-size: 0.8rem;
  line-height: 1.7;
  color: var(--slate-400);
  border-left: 2px solid var(--line-600);
}

.site-footer__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 0 22px;
  border-top: 2px solid var(--line-600);
}
.site-footer__legal-item {
  font-size: 0.82rem;
  color: var(--slate-400);
}
.site-footer__legal-item--mono { font-family: var(--font-mono); letter-spacing: 0.08em; }

/* ---------- 响应式 ---------- */
@media (max-width: 1240px) {
  .site-footer__grid { grid-template-columns: minmax(200px, 1.2fr) repeat(2, minmax(120px, 0.9fr)) minmax(230px, 1.4fr); }
}

@media (max-width: 1099px) {
  .site-footer__grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .site-footer__brand,
  .footer-contact { grid-column: 1 / -1; }
}

@media (max-width: 1023px) {
  :root { --header-h: 70px; --header-h-sm: 60px; }
  .shell { grid-template-columns: minmax(0, 1fr); gap: clamp(20px, 4vw, 36px); }
  .rail {
    position: static;
    padding: 0 0 12px;
    border-left: 0;
    border-bottom: 2px solid var(--line-600);
  }
  .rail__list { display: flex; gap: 10px; overflow-x: auto; padding-bottom: 6px; }
  .rail__link { border-bottom: 0; white-space: nowrap; padding: 8px 10px; background: var(--ink-800); border: 1px solid var(--line-600); }
  .rail__link[aria-current="true"] { border-color: var(--gold-500); }
  .col-main,
  .col-aside { grid-column: 1 / -1; }

  .header-actions { display: none; }
  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    z-index: 290;
    margin: 0;
    padding: clamp(16px, 4vw, 26px) clamp(16px, 4vw, 32px) clamp(22px, 5vw, 32px);
    max-height: calc(100vh - var(--header-h) - 10px);
    overflow-y: auto;
    background: var(--ink-800);
    border-bottom: 2px solid var(--line-600);
    box-shadow: 0 26px 46px rgba(4, 9, 28, 0.66);
    visibility: hidden;
    opacity: 0;
    transform: translateY(-10px);
    transition: opacity var(--dur) var(--ease), transform var(--dur) var(--ease), visibility var(--dur) linear;
  }
  .site-nav[data-open] { visibility: visible; opacity: 1; transform: none; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__item { border-bottom: 1px solid rgba(43, 59, 96, 0.85); }
  .site-nav__link { display: block; padding: 15px 2px; font-size: 1.05rem; }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] { padding-left: 18px; }
  .site-nav__link[aria-current="page"]::before {
    content: "";
    position: absolute;
    left: 0;
    top: 50%;
    width: 7px;
    height: 7px;
    background: var(--gold-500);
    transform: translateY(-50%) rotate(45deg);
  }
  .site-nav__quick { display: grid; gap: 10px; margin-top: 22px; }

  html.nav-open { overflow: hidden; }
}

@media (max-width: 760px) {
  body { background-size: 56px 56px; }
  .site-footer__grid { grid-template-columns: minmax(0, 1fr); }
  .grid-12 { grid-template-columns: minmax(0, 1fr); }
  .track > * { flex-basis: min(78vw, 300px); }
}

@media (max-width: 520px) {
  .brand__sub { display: none; }
  .brand__mark { width: 36px; height: 36px; font-size: 0.72rem; }
  .brand__name { font-size: 0.98rem; }
  .nav-toggle__text { display: none; }
  .site-footer__legal { flex-direction: column; align-items: flex-start; gap: 6px; }
}

@media (min-width: 1024px) {
  body { background-attachment: fixed; }
}

/* ---------- 无障碍与降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
  .tabs__panel { animation: none; }
}

@media print {
  .site-header, .site-footer, .toast { display: none; }
  body { background: #fff; color: #000; }
}