/* ============================================================
   金游世界 · 共享样式 /assets/site.css
   夜航指挥舱 × 东方游艺厅：暗底微光、切角面板、等宽索引
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: #0A0C10;
}

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

ul, ol { list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; background: none; border: 0; }
button { cursor: pointer; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
summary { list-style: none; }
summary::-webkit-details-marker { display: none; }

/* ---------- 2. 变量 ---------- */
:root {
  --obsidian: #0A0C10;
  --rock: #141821;
  --iron: #1E232E;
  --iron-2: #262C39;
  --gold: #E9A23B;
  --gold-hi: #FFD27A;
  --jade: #35C9A4;
  --crimson: #B23C5A;
  --indigo: #4B3A78;
  --warn: #E2703A;
  --ink: #E8E4DA;
  --ink-strong: #FFF4DE;
  --muted: #9BA3AE;
  --line: rgba(233, 162, 59, .22);
  --line-soft: rgba(232, 228, 218, .10);

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

  --gutter: clamp(16px, 4vw, 40px);
  --maxw: 1320px;
  --chamfer: 16px;
  --ease: cubic-bezier(.22, .8, .28, 1);
  --duration: 260ms;
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  font-weight: 400;
  letter-spacing: .01em;
  color: var(--ink);
  background-color: var(--obsidian);
  background-image:
    linear-gradient(to right, rgba(232, 228, 218, .034) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(232, 228, 218, .034) 1px, transparent 1px),
    radial-gradient(880px 520px at 10% -6%, rgba(233, 162, 59, .17), transparent 62%),
    radial-gradient(720px 460px at 96% 0%, rgba(75, 58, 120, .32), transparent 66%),
    radial-gradient(700px 640px at 50% 112%, rgba(53, 201, 164, .10), transparent 72%);
  background-size: 72px 72px, 72px 72px, auto, auto, auto;
  background-repeat: repeat, repeat, no-repeat, no-repeat, no-repeat;
  background-attachment: fixed, fixed, fixed, fixed, fixed;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5 {
  font-family: var(--font-head);
  font-weight: 800;
  letter-spacing: .04em;
  line-height: 1.16;
  color: var(--ink-strong);
}
h1 { font-size: clamp(28px, 3.4vw, 58px); }
h2 { font-size: clamp(23px, 2.4vw, 38px); }
h3 { font-size: clamp(19px, 1.6vw, 26px); }
h4 { font-size: 17px; font-weight: 700; letter-spacing: .07em; }
h5 { font-size: 14px; font-weight: 700; letter-spacing: .1em; color: var(--gold-hi); }

strong { color: var(--ink-strong); font-weight: 700; }
::selection { background: rgba(233, 162, 59, .35); color: #FFF7E6; }

@media (max-width: 720px) {
  body { font-size: 16px; }
}

/* ---------- 4. 焦点与无障碍 ---------- */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(255, 210, 122, .30);
}
.btn:focus-visible,
.tab:focus-visible,
.panel__tab:focus-visible {
  outline: none;
  box-shadow: inset 0 0 0 2px #0A0C10, inset 0 0 0 4px var(--gold-hi);
}

.skip-link {
  position: absolute;
  left: var(--gutter);
  top: -72px;
  z-index: 200;
  display: inline-flex;
  align-items: center;
  padding: 11px 18px;
  background: var(--gold);
  color: #150F03;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .06em;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 10px), calc(100% - 10px) 100%, 0 100%);
  transition: top 180ms var(--ease);
}
.skip-link:focus { top: 10px; }

.visually-hidden {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 5. 工具类 ---------- */
.shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .02em;
}

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  letter-spacing: .01em;
  color: var(--gold-hi);
}

.eyebrow {
  display: flex;
  align-items: center;
  gap: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: .26em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 14px;
}
.eyebrow::after {
  content: "";
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--line), transparent);
}

.divider {
  border: 0;
  border-top: 1px dashed var(--line);
  margin-block: clamp(22px, 3vw, 40px);
}

/* ---------- 6. 按钮 / 标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 19px;
  font-family: var(--font-head);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: .06em;
  line-height: 1.2;
  border: 1px solid transparent;
  clip-path: polygon(11px 0, 100% 0, 100% calc(100% - 11px), calc(100% - 11px) 100%, 0 100%, 0 11px);
  transition: background-color var(--duration) var(--ease),
              color var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}
.btn--gold {
  background: linear-gradient(135deg, var(--gold-hi), var(--gold) 62%, #C57F22);
  color: #150F03;
}
.btn--gold:hover {
  background: linear-gradient(135deg, #FFF0CB, var(--gold-hi) 60%, var(--gold));
}
.btn--ghost {
  background: rgba(233, 162, 59, .07);
  border-color: rgba(233, 162, 59, .45);
  color: var(--gold-hi);
}
.btn--ghost:hover {
  background: rgba(233, 162, 59, .16);
  border-color: var(--gold-hi);
  color: #FFF6E4;
}
.btn--sm { padding: 9px 14px; font-size: 12.5px; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  line-height: 1.5;
  border: 1px solid currentColor;
  background: rgba(232, 228, 218, .05);
  color: var(--muted);
}
.tag--gold { color: var(--gold-hi); background: rgba(233, 162, 59, .14); border-color: rgba(233, 162, 59, .5); }
.tag--jade { color: var(--jade); background: rgba(53, 201, 164, .13); border-color: rgba(53, 201, 164, .45); }
.tag--crimson { color: #EE9BB2; background: rgba(178, 60, 90, .28); border-color: rgba(178, 60, 90, .7); }
.tag--indigo { color: #BFB0F0; background: rgba(75, 58, 120, .45); border-color: rgba(151, 127, 214, .5); }
.tag--warn { color: #F3A87E; background: rgba(226, 112, 58, .18); border-color: rgba(226, 112, 58, .55); }

/* ---------- 7. 网格 ---------- */
.grid { display: grid; gap: clamp(14px, 1.9vw, 26px); }
.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--asym { grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr); }
.grid--wide { grid-template-columns: minmax(0, 1fr) minmax(0, .62fr); }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.span-4 { grid-column: span 4; }
.span-5 { grid-column: span 5; }
.span-6 { grid-column: span 6; }
.span-7 { grid-column: span 7; }
.span-8 { grid-column: span 8; }
.span-12 { grid-column: span 12; }

/* ---------- 8. 章节 / 面板 ---------- */
.section { padding-block: clamp(34px, 5.2vw, 76px); }
.section--tight { padding-block: clamp(20px, 3vw, 40px); }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 16px 26px;
  margin-bottom: clamp(18px, 2.4vw, 32px);
}
.section-head__text { max-width: 64ch; }
.section-head__text p { color: var(--muted); font-size: 15.5px; margin-top: 10px; }

.panel-stack { display: grid; gap: clamp(16px, 2.4vw, 34px); }

.panel {
  position: relative;
  padding: clamp(20px, 2.7vw, 38px);
  background: linear-gradient(180deg, rgba(20, 24, 33, .96), rgba(10, 12, 16, .92));
  border: 1px solid var(--line);
  clip-path: polygon(0 0,
    calc(100% - var(--chamfer)) 0,
    100% var(--chamfer),
    100% 100%,
    var(--chamfer) 100%,
    0 calc(100% - var(--chamfer)));
}
.panel--rock {
  background: linear-gradient(180deg, rgba(30, 35, 46, .96), rgba(20, 24, 33, .92));
}
.panel--indigo {
  background: linear-gradient(180deg, rgba(75, 58, 120, .44), rgba(10, 12, 16, .93));
  border-color: rgba(151, 127, 214, .34);
}
.panel--gold { border-color: rgba(233, 162, 59, .58); }

.panel__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px 18px;
  padding-bottom: 14px;
  margin-bottom: clamp(14px, 1.8vw, 22px);
  border-bottom: 1px dashed var(--line-soft);
}
.panel__tab {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--gold);
  background: rgba(233, 162, 59, .09);
  border: 1px solid rgba(233, 162, 59, .4);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}
.panel__title { margin: 0; font-size: clamp(19px, 2vw, 27px); }
.panel__note {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--muted);
}
.panel__body { color: var(--ink); }
.panel__body > p + p { margin-top: 1.1em; }
.panel__grid {
  display: grid;
  gap: clamp(14px, 2vw, 26px);
  grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
}

/* ---------- 9. 分段切换（标签页） ---------- */
.panel__tabs { margin-top: 4px; }

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

.tab {
  padding: 8px 14px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .09em;
  color: var(--muted);
  background: rgba(30, 35, 46, .7);
  border: 1px solid rgba(232, 228, 218, .14);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
  transition: color var(--duration) var(--ease),
              background-color var(--duration) var(--ease),
              border-color var(--duration) var(--ease);
}
.tab:hover { color: var(--ink-strong); border-color: rgba(233, 162, 59, .5); }
.tab[aria-selected="true"] {
  color: #150F03;
  background: linear-gradient(135deg, var(--gold-hi), var(--gold) 60%, #C57F22);
  border-color: var(--gold-hi);
  font-weight: 700;
}

.tabpanel { padding-top: clamp(14px, 1.8vw, 22px); }
.tabpanel[hidden] { display: none; }

/* ---------- 10. 页面头 / 正文 ---------- */
.page-head { padding-block: clamp(28px, 4.6vw, 64px) clamp(18px, 3vw, 36px); }
.page-title { font-size: clamp(26px, 3.2vw, 52px); }
.page-lede {
  max-width: 68ch;
  margin-top: 14px;
  font-size: 16.5px;
  color: var(--muted);
}

.prose { max-width: 78ch; }
.prose p + p { margin-top: 1.1em; }
.prose h2, .prose h3 { margin-top: 1.6em; margin-bottom: .5em; }
.prose ul, .prose ol { margin: 1em 0; padding-left: 1.3em; list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: .4em; }
.prose a {
  color: var(--gold-hi);
  border-bottom: 1px dashed rgba(255, 210, 122, .6);
}
.prose a:hover { border-bottom-style: solid; }
.prose blockquote {
  margin: 1.2em 0;
  padding-left: 16px;
  border-left: 2px solid var(--gold);
  color: var(--muted);
}
.prose code {
  font-family: var(--font-mono);
  font-size: .92em;
  padding: 1px 5px;
  color: var(--gold-hi);
  background: rgba(30, 35, 46, .9);
  border: 1px solid var(--line-soft);
}

/* ---------- 11. 面包屑 ---------- */
.breadcrumbs {
  padding-block: clamp(12px, 2vw, 22px);
  border-bottom: 1px dashed var(--line-soft);
}
.crumb-list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}
.crumb-list a { color: var(--muted); }
.crumb-list a:hover { color: var(--gold-hi); }
.crumb-list [aria-current="page"] { color: var(--ink-strong); }
.crumb__sep { color: rgba(233, 162, 59, .65); }

/* ---------- 12. 图像容器基础 ---------- */
.media-frame {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  background: var(--rock);
  border: 1px solid var(--line);
  clip-path: polygon(0 0,
    calc(100% - 16px) 0,
    100% 16px,
    100% 100%,
    16px 100%,
    0 calc(100% - 16px));
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}
.media-frame__ph {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 16px;
  text-align: center;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .2em;
  color: rgba(232, 228, 218, .55);
  background:
    repeating-linear-gradient(135deg, rgba(233, 162, 59, .10) 0 12px, rgba(10, 12, 16, 0) 12px 24px),
    radial-gradient(520px 280px at 28% 18%, rgba(75, 58, 120, .55), transparent 72%),
    radial-gradient(420px 260px at 82% 96%, rgba(53, 201, 164, .18), transparent 74%);
}
.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--ink);
  background: linear-gradient(180deg, rgba(10, 12, 16, 0), rgba(10, 12, 16, .92));
}

.media-row {
  display: flex;
  gap: clamp(12px, 1.6vw, 20px);
  padding: 4px 4px 14px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  scrollbar-width: thin;
  scrollbar-color: var(--gold) rgba(30, 35, 46, .8);
}
.media-row > * { flex: 0 0 min(320px, 80%); scroll-snap-align: start; }
.media-row::-webkit-scrollbar { height: 8px; }
.media-row::-webkit-scrollbar-track { background: rgba(30, 35, 46, .8); }
.media-row::-webkit-scrollbar-thumb { background: var(--gold); }

/* ---------- 13. 命令栏头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: rgba(10, 12, 16, .88);
  -webkit-backdrop-filter: blur(10px);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--line);
}

.header-rail {
  height: 2px;
  background: rgba(232, 228, 218, .07);
  overflow: hidden;
}
.header-rail__fill {
  display: block;
  height: 100%;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--gold), var(--gold-hi) 58%, var(--jade));
}

.header-bar {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding-inline: var(--gutter);
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
  height: 72px;
  transition: height 220ms var(--ease);
}
[data-scrolled="true"] .header-bar { height: 56px; }

.brand {
  display: inline-flex;
  align-items: center;
  gap: 11px;
  flex: 0 0 auto;
}
.brand__mark {
  display: grid;
  place-items: center;
  width: 36px;
  height: 36px;
  flex: 0 0 auto;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 17px;
  color: #120C02;
  background: linear-gradient(140deg, var(--gold-hi), var(--gold) 46%, var(--crimson));
  clip-path: polygon(0 0, 100% 0, 100% 62%, 62% 100%, 0 100%);
}
.brand__text { display: flex; flex-direction: column; line-height: 1.05; }
.brand__cn {
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: .14em;
  color: var(--ink-strong);
}
.brand__en {
  margin-top: 3px;
  font-family: var(--font-mono);
  font-size: 9.5px;
  letter-spacing: .24em;
  color: var(--muted);
}
.brand--footer .brand__cn { font-size: 18px; }

.primary-nav { margin-left: clamp(4px, 1vw, 18px); }
.primary-nav__list { display: flex; align-items: center; gap: 2px; }
.primary-nav__item { display: flex; }

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 12px;
  font-size: 14.5px;
  letter-spacing: .03em;
  color: var(--muted);
  transition: color var(--duration) var(--ease),
              background-color var(--duration) var(--ease);
}
.nav-link:hover { color: var(--ink-strong); background: rgba(233, 162, 59, .09); }
.nav-link__idx {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .1em;
  color: rgba(233, 162, 59, .7);
}
.nav-link__label { font-weight: 500; }

.nav-link[aria-current="page"] {
  color: var(--ink-strong);
  background: rgba(233, 162, 59, .11);
}
.nav-link[aria-current="page"]::after {
  content: "";
  position: absolute;
  left: 12px;
  right: 12px;
  bottom: 2px;
  height: 2px;
  background: linear-gradient(90deg, var(--gold), var(--gold-hi));
}
.nav-link[aria-current="page"]::before {
  content: "";
  position: absolute;
  top: 7px;
  right: 7px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 8px rgba(53, 201, 164, .9);
}

.header-tools {
  margin-left: auto;
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}

.status-lamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 11px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  white-space: nowrap;
  color: var(--jade);
  background: rgba(53, 201, 164, .08);
  border: 1px solid rgba(53, 201, 164, .4);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%);
}
.status-lamp__dot {
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 10px rgba(53, 201, 164, .9);
  animation: lamp-pulse 2.4s var(--ease) infinite;
}
@keyframes lamp-pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: .45; transform: scale(.82); }
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--gold);
  background: rgba(20, 24, 33, .92);
  border: 1px solid rgba(233, 162, 59, .42);
}
.nav-toggle:hover { color: var(--gold-hi); border-color: var(--gold-hi); background: rgba(233, 162, 59, .12); }
.nav-toggle__bars {
  position: relative;
  display: block;
  width: 16px;
  height: 2px;
  flex: 0 0 auto;
  background: var(--gold);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 16px;
  height: 2px;
  background: var(--gold);
  transition: transform 180ms var(--ease), background-color 180ms var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
  background: var(--gold-hi);
  transform: translateY(6px) rotate(45deg);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
  background: var(--gold-hi);
  transform: translateY(-6px) rotate(-45deg);
}

.status-strip {
  max-height: 64px;
  overflow: hidden;
  border-top: 1px dashed var(--line);
  background: rgba(20, 24, 33, .6);
  transition: max-height 240ms var(--ease), opacity 200ms var(--ease);
}
.status-strip__inner {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: 8px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 26px;
}
.status-strip__item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 12px;
  color: var(--muted);
}
.status-strip__key { letter-spacing: .1em; }
.status-strip__key::after { content: "/"; margin-left: 9px; color: rgba(233, 162, 59, .6); }
.status-strip__val {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .06em;
  color: var(--gold-hi);
}
[data-scrolled="true"] .status-strip {
  max-height: 0;
  opacity: 0;
  border-color: transparent;
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(40px, 6vw, 90px);
  border-top: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(20, 24, 33, .97) 0%, rgba(10, 12, 16, .99) 62%);
  color: var(--ink);
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: min(320px, 40%);
  height: 2px;
  background: linear-gradient(90deg, var(--gold), rgba(233, 162, 59, 0));
}
.footer-shell {
  width: 100%;
  max-width: var(--maxw);
  margin-inline: auto;
  padding: clamp(32px, 4.6vw, 64px) var(--gutter) 22px;
}

.footer-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr));
  gap: clamp(22px, 3vw, 40px);
  align-items: start;
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
}
.footer-note {
  max-width: 40ch;
  font-size: 14.5px;
  color: var(--muted);
}
.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}
.footer-meta__k { color: var(--gold); text-transform: uppercase; letter-spacing: .16em; }
.footer-meta__v { color: var(--ink); }

.footer-col { min-width: 0; }
.footer-fold { border-top: 1px dashed var(--line-soft); padding-top: 12px; }
.footer-col__title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-block: 4px;
  font-family: var(--font-head);
  font-size: 13.5px;
  font-weight: 700;
  letter-spacing: .16em;
  color: var(--gold-hi);
  cursor: pointer;
}
.footer-col__title::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 400;
  color: var(--gold);
}
.footer-fold[open] .footer-col__title::after { content: "–"; }

.footer-list { margin-top: 12px; display: grid; gap: 9px; }
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14.5px;
  color: var(--muted);
  transition: color var(--duration) var(--ease);
}
.footer-link::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background: rgba(233, 162, 59, .5);
  transition: background-color var(--duration) var(--ease);
}
.footer-link:hover { color: var(--ink-strong); }
.footer-link:hover::before { background: var(--jade); }

.footer-contact {
  margin-top: clamp(24px, 3vw, 40px);
  padding: clamp(16px, 2.2vw, 26px);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  background: linear-gradient(135deg, rgba(233, 162, 59, .09), rgba(20, 24, 33, .72));
  border: 1px solid var(--line);
  clip-path: polygon(0 0,
    calc(100% - 14px) 0,
    100% 14px,
    100% 100%,
    14px 100%,
    0 calc(100% - 14px));
}
.footer-contact__row { display: flex; flex-direction: column; gap: 4px; min-width: 0; }
.footer-contact__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
}
.footer-contact__v { font-size: 14.5px; color: var(--ink); word-break: break-word; }
.footer-contact__note {
  grid-column: 1 / -1;
  padding-top: 12px;
  border-top: 1px dashed var(--line-soft);
  font-size: 13px;
  color: var(--muted);
  max-width: none;
}

.footer-bottom {
  margin-top: clamp(20px, 2.6vw, 32px);
  padding-top: 16px;
  border-top: 1px solid var(--line-soft);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .03em;
  color: var(--muted);
}
.footer-legal__sep { color: rgba(233, 162, 59, .6); }
.footer-stamp {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--gold);
}
.footer-stamp__dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--jade);
  box-shadow: 0 0 10px rgba(53, 201, 164, .9);
}

/* ---------- 15. 显现动效协议 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 320ms var(--ease), transform 320ms var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 16. 响应式 ---------- */
@media (max-width: 1180px) {
  .nav-link__idx { display: none; }
  .nav-link { padding: 9px 10px; font-size: 14px; }
}

@media (max-width: 980px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 900px) {
  .grid--2, .grid--3, .grid--asym, .grid--wide { grid-template-columns: minmax(0, 1fr); }
  .grid--12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .span-4, .span-5, .span-6, .span-7, .span-8 { grid-column: span 6; }

  .nav-toggle { display: inline-flex; }
  .primary-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    padding: 10px var(--gutter) 20px;
    max-height: calc(100vh - 72px);
    overflow-y: auto;
    background: linear-gradient(180deg, #12161F, #0A0C10);
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 44px -30px #000;
  }
  .primary-nav[data-open] { display: block; }
  .primary-nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .primary-nav__item { display: block; }
  .nav-link {
    display: flex;
    width: 100%;
    padding: 14px 10px;
    font-size: 16px;
    border-bottom: 1px dashed var(--line-soft);
  }
  .nav-link__idx { display: inline; }
  .nav-link[aria-current="page"]::after { left: 10px; right: auto; width: 36px; bottom: 6px; }
  .nav-link[aria-current="page"]::before { top: 50%; right: 12px; margin-top: -2px; }
}

@media (max-width: 720px) {
  .status-strip__item--wide { display: none; }
  .footer-contact { grid-template-columns: minmax(0, 1fr); }
  .page-title { font-size: clamp(24px, 7vw, 34px); }
  .header-bar { gap: 8px; }
}

@media (max-width: 620px) {
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
}

@media (min-width: 621px) {
  .footer-col__title { pointer-events: none; cursor: default; }
  .footer-col__title::after { display: none; }
  .footer-fold { border-top: 0; padding-top: 0; }
}

/* ---------- 17. 降低动效偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
}