/* ============================================================
   永利中心 · 共享样式表 /assets/site.css
   档案库 × 视频索引 · 悬浮胶囊导航 · 粗边框硬阴影
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-behavior: smooth;
  scroll-padding-top: calc(var(--header-h) + 28px);
}

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

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

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

a { color: inherit; text-decoration: none; }

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

button {
  background: none;
  border: 0;
  padding: 0;
  cursor: pointer;
}

:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 3px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink: #0B1219;
  --navy: #13263D;
  --gold: #F5A623;
  --gold-lt: #FFD79A;
  --celadon: #6FAF9F;
  --silver: #A8B2C1;
  --paper: #F4F6F9;
  --slate: #2A3B52;
  --cinnabar: #D64545;
  --teal: #1F4E5F;

  --line: rgba(168, 178, 193, 0.26);
  --line-soft: rgba(168, 178, 193, 0.12);

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

  --wrap: 1200px;
  --gutter: clamp(16px, 4vw, 40px);
  --header-h: 104px;

  --shadow-hard: 7px 7px 0 rgba(245, 166, 35, 0.16);
  --shadow-deep: 0 34px 70px -34px rgba(0, 0, 0, 0.95);

  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 3. 基础排版 ---------- */
body {
  min-height: 100vh;
  padding-top: var(--header-h);
  background-color: var(--ink);
  background-image:
    linear-gradient(var(--line-soft) 1px, transparent 1px),
    linear-gradient(90deg, var(--line-soft) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  letter-spacing: 0.01em;
  text-rendering: optimizeLegibility;
}

h1, h2, h3, h4 {
  font-family: var(--font-head);
  font-weight: 800;
  line-height: 1.2;
  letter-spacing: -0.02em;
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

main { display: block; }

#main-content { scroll-margin-top: calc(var(--header-h) + 16px); }

/* ---------- 4. 布局骨架 ---------- */
.wrap {
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(48px, 7vw, 96px); }
.section--tight { padding-block: clamp(26px, 3.6vw, 48px); }

.section--navy {
  background: var(--navy);
  color: var(--paper);
}

.section--paper {
  background: var(--paper);
  color: var(--ink);
  background-image:
    linear-gradient(rgba(42, 59, 82, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(42, 59, 82, 0.06) 1px, transparent 1px);
  background-size: 64px 64px, 64px 64px;
}

.section__head {
  max-width: 840px;
  margin-bottom: clamp(22px, 3vw, 40px);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--gold);
}

.eyebrow::before {
  content: "";
  width: 24px;
  height: 2px;
  background: currentColor;
}

.section--paper .eyebrow { color: #B8760C; }

.section-title {
  font-size: clamp(28px, 4.4vw, 52px);
  font-weight: 900;
  line-height: 1.1;
  letter-spacing: -0.028em;
}

.lede {
  max-width: 64ch;
  margin-top: 16px;
  font-size: clamp(15.5px, 1.4vw, 17.5px);
  line-height: 1.85;
  color: var(--silver);
}

.section--paper .lede { color: #48607C; }

.rule {
  height: 1px;
  border: 0;
  margin-block: clamp(22px, 3vw, 40px);
  background: linear-gradient(90deg, var(--slate), rgba(42, 59, 82, 0));
}

.section--paper .rule {
  background: linear-gradient(90deg, #C9D3DE, rgba(201, 211, 222, 0));
}

/* ---------- 5. 网格 ---------- */
.grid {
  display: grid;
  gap: clamp(16px, 2.4vw, 28px);
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
.grid--split { grid-template-columns: minmax(0, 5fr) minmax(0, 7fr); }
.grid--rail { grid-template-columns: minmax(220px, 3fr) minmax(0, 9fr); }

/* ---------- 6. 卡片 / 标签 / 时间轴 ---------- */
.card {
  position: relative;
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--navy);
  border: 1px solid var(--slate);
  transition: transform 0.22s var(--ease), border-color 0.22s var(--ease), box-shadow 0.22s var(--ease);
}

.card::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: 3px;
  background: var(--cat-accent, var(--gold));
  opacity: 0.9;
}

.card:hover {
  transform: translateY(-4px);
  border-color: var(--cat-accent, var(--gold));
  box-shadow: var(--shadow-hard);
}

.card__meta {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--silver);
}

.card__title {
  margin-block: 10px 8px;
  font-family: var(--font-head);
  font-size: clamp(17px, 1.6vw, 20px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.012em;
}

.card__text {
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--silver);
}

.section--paper .card { background: #FFFFFF; border-color: #D3DBE4; }
.section--paper .card__text { color: #48607C; }

.tag-list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  background: rgba(11, 18, 25, 0.5);
  border: 1px solid var(--slate);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--silver);
}

.tag--accent {
  border-color: var(--gold);
  color: var(--gold);
  background: rgba(245, 166, 35, 0.1);
}

.tag--live {
  border-color: var(--celadon);
  color: var(--celadon);
  background: rgba(111, 175, 159, 0.1);
}

.tag--cat {
  border-color: currentColor;
  color: var(--cat-accent, var(--gold));
}

.cat-1 { --cat-accent: #F5A623; }
.cat-2 { --cat-accent: #6FAF9F; }
.cat-3 { --cat-accent: #D64545; }
.cat-4 { --cat-accent: #1F4E5F; }
.cat-5 { --cat-accent: #A8B2C1; }
.cat-6 { --cat-accent: #FFD79A; }
.cat-7 { --cat-accent: #2A3B52; }
.cat-8 { --cat-accent: #7B61A8; }
.cat-9 { --cat-accent: #4C9A8A; }
.cat-10 { --cat-accent: #C97B4A; }
.cat-11 { --cat-accent: #5B7FA6; }
.cat-12 { --cat-accent: #8A8F98; }

.timeline-track {
  display: flex;
  overflow-x: auto;
  padding-bottom: 14px;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--slate) transparent;
}

.timeline-track::-webkit-scrollbar { height: 6px; }
.timeline-track::-webkit-scrollbar-track { background: rgba(42, 59, 82, 0.4); }
.timeline-track::-webkit-scrollbar-thumb { background: var(--slate); }

.timeline-node {
  position: relative;
  flex: 0 0 clamp(220px, 26vw, 300px);
  padding: 20px 22px 22px 24px;
  border-left: 1px solid var(--slate);
  scroll-snap-align: start;
}

.timeline-node::before {
  content: "";
  position: absolute;
  top: 26px;
  left: -5px;
  width: 9px;
  height: 9px;
  background: var(--cat-accent, var(--gold));
  box-shadow: 0 0 0 4px var(--ink);
}

.timeline-node:last-child { border-right: 1px solid var(--slate); }

/* ---------- 7. 图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 1px solid var(--slate);
  background-color: #0E1A28;
  background-image:
    linear-gradient(135deg, rgba(19, 38, 61, 0.95), rgba(11, 18, 25, 0.98)),
    repeating-linear-gradient(0deg, rgba(168, 178, 193, 0.08) 0 1px, transparent 1px 9px);
}

.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background:
    linear-gradient(90deg, rgba(245, 166, 35, 0.14) 0 1px, transparent 1px) 0 0 / 56px 100%,
    linear-gradient(0deg, rgba(168, 178, 193, 0.07) 0 1px, transparent 1px) 0 0 / 100% 56px;
}

.media-frame img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 3 / 4; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--soft { aspect-ratio: 4 / 3; }

.media-frame__cap {
  position: absolute;
  inset: auto 0 0 0;
  z-index: 2;
  padding: 9px 13px;
  background: linear-gradient(0deg, rgba(11, 18, 25, 0.92), rgba(11, 18, 25, 0));
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--paper);
}

.media-frame__badge {
  position: absolute;
  top: 0;
  left: 0;
  z-index: 2;
  padding: 5px 10px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: 0.12em;
}

/* ---------- 8. 按钮 / 面包屑 / 正文 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 12px 22px;
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-size: 14.5px;
  font-weight: 800;
  letter-spacing: 0.02em;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
              transform 0.2s var(--ease), box-shadow 0.2s var(--ease),
              border-color 0.2s var(--ease);
}

.btn--primary {
  background: var(--gold);
  color: var(--ink);
  box-shadow: 5px 5px 0 rgba(11, 18, 25, 0.8);
}

.btn--primary:hover {
  background: var(--gold-lt);
  transform: translate(-2px, -2px);
  box-shadow: 7px 7px 0 rgba(11, 18, 25, 0.8);
}

.btn--ghost {
  border-color: var(--slate);
  color: var(--paper);
}

.btn--ghost:hover {
  border-color: var(--gold);
  color: var(--gold);
}

.btn--quiet {
  padding-inline: 0;
  border-bottom: 2px solid var(--gold);
  color: var(--gold);
}

.btn--quiet:hover { color: var(--gold-lt); border-color: var(--gold-lt); }

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 9px;
  margin-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.breadcrumb a {
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.breadcrumb a:hover { color: var(--gold); border-color: var(--gold); }

.breadcrumb__sep { color: var(--slate); }

.prose {
  max-width: 72ch;
  font-size: 16.5px;
  line-height: 1.9;
  color: rgba(244, 246, 249, 0.86);
}

.prose > * + * { margin-top: 1.1em; }

.prose h2 {
  margin-top: 2em;
  font-size: clamp(22px, 2.6vw, 30px);
  letter-spacing: -0.022em;
  color: var(--paper);
}

.prose h3 {
  margin-top: 1.6em;
  font-size: 18px;
  color: var(--gold);
}

.prose ul { padding-left: 0; }
.prose ul li { position: relative; padding-left: 20px; }

.prose ul li::before {
  content: "";
  position: absolute;
  top: 0.75em;
  left: 0;
  width: 9px;
  height: 2px;
  background: var(--celadon);
}

.prose a {
  color: var(--gold);
  border-bottom: 1px solid rgba(245, 166, 35, 0.42);
}

.section--paper .prose { color: #33475E; }
.section--paper .prose h2 { color: var(--ink); }
.section--paper .prose h3 { color: #B8760C; }
.section--paper .prose ul li::before { background: var(--teal); }
.section--paper .prose a { color: #B8760C; border-color: rgba(184, 118, 12, 0.45); }

/* ---------- 9. 显现 ---------- */
.js-reveal [data-reveal] {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity 0.6s var(--ease), transform 0.6s var(--ease);
}

.js-reveal [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 10. 跳过链接 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 50%;
  z-index: 200;
  padding: 12px 22px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 800;
  transform: translate(-50%, -180%);
  transition: transform 0.22s var(--ease);
}

.skip-link:focus { transform: translate(-50%, 0); }

/* ---------- 11. 页头 ---------- */
.site-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 60;
  padding: 14px var(--gutter);
  pointer-events: none;
}

.header-capsule {
  position: relative;
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.6vw, 24px);
  width: 100%;
  max-width: var(--wrap);
  margin-inline: auto;
  padding: 9px 14px 9px 20px;
  background: rgba(19, 38, 61, 0.9);
  border: 1px solid var(--line);
  border-radius: 3px;
  box-shadow: var(--shadow-deep);
  pointer-events: auto;
}

.header-capsule::before {
  content: "";
  position: absolute;
  top: 10px;
  bottom: 10px;
  left: 0;
  width: 3px;
  background: linear-gradient(180deg, var(--gold), rgba(245, 166, 35, 0));
}

.brand {
  display: flex;
  flex: 0 0 auto;
  align-items: center;
  gap: 11px;
}

.brand__mark {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 900;
  line-height: 1;
  box-shadow: 3px 3px 0 rgba(245, 166, 35, 0.22);
}

.brand__mark--lg {
  width: 54px;
  height: 54px;
  font-size: 27px;
}

.brand__text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand__name {
  font-family: var(--font-head);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.brand__meta {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--silver);
}

.primary-nav { margin-left: auto; }

.primary-nav__list {
  display: flex;
  align-items: center;
  gap: 2px;
}

.primary-nav__item { display: block; }

.nav-link {
  position: relative;
  display: inline-block;
  padding: 8px 12px;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--silver);
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}

.nav-link::after {
  content: "";
  position: absolute;
  right: 12px;
  bottom: 4px;
  left: 12px;
  height: 2px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.25s var(--ease);
}

.nav-link:hover { color: var(--paper); background: rgba(244, 246, 249, 0.06); }
.nav-link:hover::after { transform: scaleX(1); }

.nav-link[aria-current="page"] {
  background: var(--gold);
  color: var(--ink);
}

.nav-link[aria-current="page"]::after { transform: scaleX(0); }

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

.index-search { position: relative; }

.index-search__label {
  position: absolute;
  width: 1px;
  height: 1px;
  overflow: hidden;
  clip-path: inset(50%);
  white-space: nowrap;
}

.index-search__input {
  width: clamp(132px, 15vw, 196px);
  padding: 9px 12px;
  background: rgba(11, 18, 25, 0.72);
  border: 1px solid var(--slate);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.02em;
  transition: border-color 0.2s var(--ease), width 0.25s var(--ease);
}

.index-search__input::placeholder {
  color: rgba(168, 178, 193, 0.6);
  font-family: var(--font-body);
}

.index-search__input:focus {
  width: clamp(176px, 20vw, 236px);
  border-color: var(--gold);
  outline: none;
}

.index-search__results {
  position: absolute;
  top: calc(100% + 8px);
  right: 0;
  z-index: 24;
  min-width: 230px;
  max-height: 64vh;
  overflow-y: auto;
  padding: 6px;
  background: var(--ink);
  border: 1px solid var(--slate);
  box-shadow: 8px 8px 0 rgba(11, 18, 25, 0.85);
}

.index-search__item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 10px;
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  color: var(--silver);
  transition: background 0.18s var(--ease), color 0.18s var(--ease);
}

.index-search__item:hover,
.index-search__item:focus-visible {
  background: var(--navy);
  color: var(--gold);
}

.index-search__path {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 400;
  letter-spacing: 0.04em;
  color: rgba(168, 178, 193, 0.55);
}

.index-search__empty {
  padding: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--silver);
}

.index-search__item[hidden],
.index-search__empty[hidden],
.index-search__results [hidden] { display: none; }

.header-cta {
  flex: 0 0 auto;
  padding: 9px 16px;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-head);
  font-size: 13.5px;
  font-weight: 800;
  letter-spacing: 0.02em;
  box-shadow: 3px 3px 0 rgba(11, 18, 25, 0.85);
  transition: background 0.2s var(--ease), transform 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.header-cta:hover {
  background: var(--gold-lt);
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 rgba(11, 18, 25, 0.85);
}

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 12px;
  border: 1px solid var(--slate);
  color: var(--paper);
  font-family: var(--font-head);
  font-size: 13px;
  font-weight: 700;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.nav-toggle__bar {
  display: block;
  width: 16px;
  height: 2px;
  background: var(--gold);
  box-shadow: 0 -5px 0 var(--gold), 0 5px 0 var(--gold);
  transition: background 0.2s var(--ease), box-shadow 0.2s var(--ease);
}

.nav-toggle__text { letter-spacing: 0.08em; }

.nav-toggle[aria-expanded="true"] {
  background: var(--gold);
  border-color: var(--gold);
  color: var(--ink);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bar {
  background: var(--ink);
  box-shadow: 0 -5px 0 var(--ink), 0 5px 0 var(--ink);
}

.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 70;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--gold-lt) 55%, var(--celadon));
  transform: scaleX(0);
  transform-origin: left center;
  pointer-events: none;
}

/* ---------- 12. 页脚 ---------- */
.site-footer {
  position: relative;
  background: var(--ink);
  border-top: 1px solid var(--slate);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(
    90deg,
    var(--gold) 0 18%,
    var(--cinnabar) 18% 24%,
    var(--teal) 24% 52%,
    var(--celadon) 52% 58%,
    var(--slate) 58% 100%
  );
  opacity: 0.9;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.6fr);
  gap: clamp(24px, 3.6vw, 54px);
  padding-block: clamp(46px, 6vw, 78px) clamp(28px, 4vw, 46px);
}

.footer-brand__name {
  margin-top: 18px;
  font-family: var(--font-head);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.footer-brand__desc {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--silver);
}

.footer-brand__note {
  margin-top: 16px;
  max-width: 30ch;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(168, 178, 193, 0.78);
}

.footer-col__title {
  padding-bottom: 10px;
  margin-bottom: 16px;
  border-bottom: 1px solid var(--slate);
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--gold);
}

.footer-list li + li { margin-top: 9px; }

.footer-link {
  display: inline-block;
  font-family: var(--font-head);
  font-size: 14px;
  font-weight: 600;
  color: var(--silver);
  transition: color 0.2s var(--ease), transform 0.2s var(--ease);
}

.footer-link:hover {
  color: var(--paper);
  transform: translateX(3px);
}

.contact-list dd { margin-top: 2px; }

.contact-list dt {
  margin-top: 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--celadon);
}

.contact-list dt:first-child { margin-top: 0; }

.contact-list dd {
  font-size: 14px;
  line-height: 1.75;
  color: var(--silver);
}

.footer-base {
  border-top: 1px solid var(--slate);
  background: rgba(11, 18, 25, 0.66);
}

.footer-base__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 22px;
  padding-block: 18px;
}

.footer-base__legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  color: var(--silver);
}

.footer-base__sep { color: var(--slate); }

.footer-sub {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin-left: auto;
}

.footer-sub__link {
  padding-bottom: 2px;
  border-bottom: 1px solid transparent;
  font-family: var(--font-head);
  font-size: 12.5px;
  color: var(--silver);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.footer-sub__link:hover {
  color: var(--gold);
  border-color: var(--gold);
}

.to-top {
  position: fixed;
  right: var(--gutter);
  bottom: 28px;
  z-index: 55;
  padding: 10px 15px;
  background: var(--ink);
  border: 1px solid var(--gold);
  color: var(--gold);
  font-family: var(--font-head);
  font-size: 12.5px;
  font-weight: 800;
  letter-spacing: 0.04em;
  box-shadow: 4px 4px 0 rgba(245, 166, 35, 0.22);
  transition: background 0.2s var(--ease), color 0.2s var(--ease), transform 0.2s var(--ease);
}

.to-top:hover {
  background: var(--gold);
  color: var(--ink);
  transform: translate(-2px, -2px);
}

.to-top[hidden] { display: none; }

/* ---------- 13. 响应式 ---------- */
@media (max-width: 1120px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (max-width: 1040px) {
  :root { --header-h: 92px; }

  .nav-toggle {
    display: inline-flex;
    margin-left: auto;
  }

  .header-tools { display: none; }

  .primary-nav {
    position: absolute;
    top: calc(100% + 10px);
    right: 0;
    left: 0;
    display: none;
    max-height: min(72vh, 560px);
    margin-left: 0;
    padding: 10px;
    overflow-y: auto;
    background: var(--ink);
    border: 1px solid var(--slate);
    box-shadow: 0 30px 60px -30px rgba(0, 0, 0, 0.96);
  }

  .primary-nav[data-open] { display: block; }

  .primary-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }

  .nav-link {
    display: block;
    padding: 13px 14px;
    border-left: 2px solid transparent;
    font-size: 15px;
  }

  .nav-link::after { display: none; }

  .nav-link:hover {
    background: var(--navy);
    border-left-color: var(--gold);
  }

  .nav-link[aria-current="page"] {
    background: var(--gold);
    color: var(--ink);
    border-left-color: var(--gold);
  }

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

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

@media (max-width: 720px) {
  :root { --header-h: 86px; }

  .header-capsule { padding: 8px 12px 8px 16px; }
  .brand__meta { display: none; }

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

  .timeline-node { flex-basis: 76%; }

  .footer-sub { margin-left: 0; }

  .to-top {
    right: 14px;
    bottom: 16px;
  }
}

@media (max-width: 560px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); }
  .brand__name { font-size: 16px; }
  .skip-link { width: calc(100% - 24px); text-align: center; }
}

/* ---------- 14. 动效降级 ---------- */
@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;
    scroll-behavior: auto !important;
  }

  .js-reveal [data-reveal],
  [data-reveal] {
    opacity: 1 !important;
    transform: none !important;
  }
}