/* ============================================================
   安博体育赛事 · 共享样式 /assets/site.css
   高原观测站 × 赛事档案 · 框架式导航粗野主义体系
   ============================================================ */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  overflow-x: hidden;
}

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

ul, ol { list-style: none; }

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

button {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
  margin: 0;
}

main { display: block; }

/* ---------- 2. 变量 ---------- */
:root {
  /* 底色与结构色 */
  --ink-void: #0B1B33;
  --ink-archive: #14294A;
  --ink-grid: #25395C;

  /* 经幡五色 · 数据分类 */
  --flag-blue: #2F7FD1;
  --flag-white: #F4F6F8;
  --flag-red: #D1403C;
  --flag-green: #2E9E6B;
  --flag-yellow: #E8B33C;
  --amber: #FF9A1F;
  --paper: #E8E4DA;

  /* 文字层级 */
  --text-strong: #F4F6F8;
  --text-body: #C7D3E3;
  --text-mute: #8496B0;

  /* 尺寸 */
  --rail-w: 264px;
  --frame-h: 72px;
  --stroke: 2px;
  --stroke-fat: 3px;
  --hard-shadow: 6px 6px 0 rgba(3, 8, 18, 0.55);
  --hard-shadow-sm: 4px 4px 0 rgba(3, 8, 18, 0.6);

  /* 字体 */
  --font-index: "JetBrains Mono", "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Noto Sans Mono", monospace;
  --font-display: "Archivo Narrow", "Oswald", "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
}

/* ---------- 3. 中文排版基线 ---------- */
body {
  background-color: var(--ink-void);
  background-image:
    linear-gradient(rgba(37, 57, 92, 0.22) 1px, transparent 1px),
    linear-gradient(90deg, rgba(37, 57, 92, 0.14) 1px, transparent 1px);
  background-size: 100% 96px, 96px 100%;
  color: var(--text-body);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.9;
  font-weight: 400;
  letter-spacing: 0.012em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  overflow-wrap: break-word;
  padding-left: var(--rail-w);
  padding-top: var(--frame-h);
  min-height: 100vh;
  transition: padding-left 0.24s ease;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-display);
  color: var(--text-strong);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: 0.14em;
}

p { max-width: 62ch; }

a {
  color: var(--flag-blue);
  text-decoration: none;
  transition: color 0.16s ease;
}

a:hover { color: var(--amber); }

strong { color: var(--text-strong); font-weight: 700; }

::selection {
  background: var(--amber);
  color: var(--ink-void);
}

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

#main-content { scroll-margin-top: calc(var(--frame-h) + 24px); }

/* ---------- 4. 通用工具 ---------- */
.mono {
  font-family: var(--font-index);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.08em;
}

.wrap {
  width: 100%;
  max-width: 1180px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 56px);
}

.wrap--narrow { max-width: 820px; }

.prose { max-width: 46em; }
.prose p {
  max-width: 34em;
  margin-bottom: 1.5em;
}
.prose p:last-child { margin-bottom: 0; }
.prose h2, .prose h3 { margin: 2.2em 0 0.8em; }

/* ---------- 5. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 18px;
  font-family: var(--font-index);
  font-size: 12.5px;
  line-height: 1;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  white-space: nowrap;
  cursor: pointer;
  color: var(--text-body);
  background-color: var(--ink-archive);
  border: var(--stroke) solid var(--ink-grid);
  box-shadow: var(--hard-shadow-sm);
  transition: transform 0.16s ease, box-shadow 0.16s ease,
              background-color 0.16s ease, color 0.16s ease, border-color 0.16s ease;
}

.btn:hover {
  transform: translate(-2px, -2px);
  box-shadow: 6px 6px 0 rgba(3, 8, 18, 0.72);
  color: var(--flag-white);
}

.btn:active {
  transform: translate(1px, 1px);
  box-shadow: 2px 2px 0 rgba(3, 8, 18, 0.6);
}

.btn--amber {
  background-color: var(--amber);
  border-color: var(--amber);
  color: var(--ink-void);
}

.btn--amber:hover {
  background-color: #FFAE4A;
  border-color: #FFAE4A;
  color: var(--ink-void);
}

.btn--yellow {
  background-color: rgba(232, 179, 60, 0.08);
  border-color: var(--flag-yellow);
  color: var(--flag-yellow);
}

.btn--yellow:hover {
  background-color: var(--flag-yellow);
  color: var(--ink-void);
}

.btn--ghost {
  background-color: transparent;
  color: var(--text-mute);
}

.btn--ghost:hover { background-color: var(--ink-archive); }

/* ---------- 6. 标签 · 统计 · 卡片 ---------- */
.tag {
  display: inline-flex;
  align-items: center;
  gap: 7px;
  height: 26px;
  padding: 0 10px;
  font-family: var(--font-index);
  font-size: 11px;
  line-height: 1;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: var(--stroke) solid var(--ink-grid);
  color: var(--text-body);
  background-color: transparent;
}

.tag--blue { border-color: var(--flag-blue); color: var(--flag-blue); }
.tag--amber { border-color: var(--amber); color: var(--amber); }
.tag--yellow { border-color: var(--flag-yellow); color: var(--flag-yellow); }
.tag--green { border-color: var(--flag-green); color: var(--flag-green); }
.tag--red { border-color: var(--flag-red); color: var(--flag-red); }

.stat {
  display: inline-flex;
  align-items: baseline;
  gap: 0.4em;
  font-family: var(--font-index);
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
}

.stat__value {
  font-size: 1.4em;
  font-weight: 600;
  color: var(--flag-white);
  letter-spacing: 0.02em;
}

.stat__unit {
  font-size: 0.72em;
  color: var(--text-mute);
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.card {
  position: relative;
  display: block;
  padding: 24px 26px;
  background-color: var(--ink-archive);
  border: var(--stroke) solid var(--ink-grid);
  box-shadow: var(--hard-shadow);
}

.card__tag { margin-bottom: 14px; }

.card__title {
  font-family: var(--font-display);
  font-size: 20px;
  letter-spacing: 0.1em;
  line-height: 1.4;
  color: var(--flag-white);
  margin-bottom: 10px;
}

.card__meta {
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-mute);
}

/* ---------- 7. 章节标题 · 面包屑 · 网格 ---------- */
.section-head { margin-bottom: 28px; }

.section-head__eyebrow {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--amber);
}

.section-head__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  letter-spacing: 0.14em;
  line-height: 1.2;
  color: var(--flag-white);
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.breadcrumb a { color: var(--text-mute); }
.breadcrumb a:hover { color: var(--amber); }
.breadcrumb__sep { color: var(--ink-grid); }
.breadcrumb [aria-current="page"] { color: var(--flag-yellow); }

.grid {
  display: grid;
  gap: 22px;
}

.grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
.grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
.grid--auto { grid-template-columns: repeat(auto-fit, minmax(258px, 1fr)); }

/* ---------- 8. 响应式图片容器 ---------- */
.media-frame {
  position: relative;
  display: block;
  width: 100%;
  background-color: var(--ink-archive);
  border: var(--stroke) solid var(--ink-grid);
  box-shadow: var(--hard-shadow);
  overflow: hidden;
}

.media-frame > img,
.media-frame > svg {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media-frame--16x9 { aspect-ratio: 16 / 9; }
.media-frame--4x3 { aspect-ratio: 4 / 3; }
.media-frame--1x1 { aspect-ratio: 1 / 1; }

.media-frame__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 9px 14px;
  background-color: rgba(11, 27, 51, 0.88);
  border-top: var(--stroke) solid var(--ink-grid);
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--text-body);
}

/* ---------- 9. 页头 · 跳转链接 ---------- */
.skip-link {
  position: fixed;
  top: 0;
  left: 50%;
  z-index: 300;
  padding: 10px 20px;
  background-color: var(--amber);
  color: var(--ink-void);
  font-family: var(--font-index);
  font-size: 13px;
  letter-spacing: 0.1em;
  border: var(--stroke) solid var(--ink-void);
  transform: translate(-50%, -160%);
  transition: transform 0.18s ease;
}

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

.site-header {
  position: relative;
  z-index: 90;
}

/* 左侧纵向索引轨道 */
.rail-plate {
  position: fixed;
  top: 0;
  right: auto;
  bottom: 0;
  left: 0;
  z-index: 95;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  background-color: var(--ink-void);
  border-right: var(--stroke-fat) solid var(--ink-grid);
  padding: 20px 0 18px;
}

.rail-plate::after {
  content: "";
  position: absolute;
  top: 18px;
  right: 0;
  width: 3px;
  height: 88px;
  background-color: var(--amber);
  pointer-events: none;
}

.rail-plate__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 0 20px 18px;
  border-bottom: var(--stroke) solid var(--ink-grid);
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1 1 auto;
  min-width: 0;
  color: var(--flag-white);
}

.brand__glyph {
  display: grid;
  place-items: center;
  flex: 0 0 42px;
  width: 42px;
  height: 42px;
  background-color: var(--flag-blue);
  border: var(--stroke) solid var(--flag-white);
  box-shadow: 3px 3px 0 rgba(3, 8, 18, 0.6);
  color: var(--ink-void);
  font-family: var(--font-index);
  font-size: 12.5px;
  font-weight: 700;
  letter-spacing: 0.06em;
}

.brand__text {
  font-family: var(--font-display);
  font-size: 18px;
  letter-spacing: 0.14em;
  line-height: 1.25;
  color: var(--flag-white);
  white-space: nowrap;
  transition: color 0.16s ease;
}

.brand:hover { color: var(--flag-white); }
.brand:hover .brand__text { color: var(--amber); }

.rail-plate__meta {
  max-width: none;
  padding: 14px 20px 16px;
  border-bottom: var(--stroke) solid var(--ink-grid);
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.rail-plate__foot {
  max-width: none;
  display: flex;
  flex-direction: column;
  gap: 4px;
  margin-top: auto;
  padding: 14px 20px 0;
  border-top: var(--stroke) solid var(--ink-grid);
  font-family: var(--font-index);
  font-size: 10.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
}

/* 纵向导航 */
.site-nav {
  flex: 1 1 auto;
  overflow-y: auto;
  padding: 18px 0;
}

.site-nav__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
}

.site-nav__item { position: relative; }

.site-nav__link {
  display: grid;
  grid-template-columns: 32px 1fr 10px;
  align-items: center;
  gap: 10px;
  padding: 11px 20px 11px 16px;
  border-left: 3px solid transparent;
  color: var(--text-body);
  font-size: 15.5px;
  letter-spacing: 0.06em;
  transition: background-color 0.16s ease, color 0.16s ease,
              border-color 0.16s ease, padding-left 0.16s ease;
}

.site-nav__link:hover {
  background-color: var(--ink-archive);
  border-left-color: var(--ink-grid);
  color: var(--flag-white);
}

.site-nav__index {
  font-family: var(--font-index);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--text-mute);
  transition: color 0.16s ease;
}

.site-nav__label { line-height: 1.4; }

.site-nav__swatch {
  width: 10px;
  height: 10px;
  background-color: var(--swatch, var(--flag-blue));
  border: 1px solid rgba(244, 246, 248, 0.24);
}

.site-nav__link[data-tone="blue"] { --swatch: var(--flag-blue); }
.site-nav__link[data-tone="white"] { --swatch: var(--flag-white); }
.site-nav__link[data-tone="amber"] { --swatch: var(--amber); }
.site-nav__link[data-tone="yellow"] { --swatch: var(--flag-yellow); }
.site-nav__link[data-tone="green"] { --swatch: var(--flag-green); }
.site-nav__link[data-tone="red"] { --swatch: var(--flag-red); }

.site-nav__link[aria-current="page"] {
  background-color: var(--ink-archive);
  border-left-color: var(--swatch, var(--flag-blue));
  color: var(--flag-white);
}

.site-nav__link[aria-current="page"] .site-nav__index { color: var(--amber); }

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  flex: 0 0 auto;
  padding: 8px 12px;
  background-color: var(--ink-archive);
  border: var(--stroke) solid var(--ink-grid);
  color: var(--flag-white);
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.14em;
  cursor: pointer;
  transition: border-color 0.16s ease, color 0.16s ease;
}

.nav-toggle__bars {
  display: grid;
  gap: 3px;
  width: 16px;
}

.nav-toggle__bars i {
  display: block;
  height: 2px;
  background-color: currentColor;
  transition: transform 0.18s ease, opacity 0.18s ease;
}

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

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1) {
  transform: translateY(5px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2) { opacity: 0; }

.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3) {
  transform: translateY(-5px) rotate(-45deg);
}

/* 顶部框架条 */
.frame-bar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  z-index: 85;
  height: var(--frame-h);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  padding: 0 28px;
  background-color: var(--ink-void);
  border-bottom: var(--stroke-fat) solid var(--ink-grid);
  transition: height 0.24s ease, left 0.24s ease;
}

.frame-bar::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background-image: linear-gradient(
    90deg,
    var(--flag-blue) 0 18%,
    var(--flag-white) 18% 34%,
    var(--flag-red) 34% 50%,
    var(--flag-green) 50% 66%,
    var(--flag-yellow) 66% 82%,
    var(--amber) 82% 100%
  );
  opacity: 0.9;
  pointer-events: none;
}

.site-header.is-condensed .frame-bar { height: 56px; }

.frame-bar__status {
  max-width: 46ch;
  display: flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--text-mute);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.frame-bar__status::before {
  content: "";
  flex: 0 0 8px;
  width: 8px;
  height: 8px;
  background-color: var(--flag-green);
  box-shadow: 0 0 0 3px rgba(46, 158, 107, 0.22);
  animation: statusPulse 2.6s ease-in-out infinite;
}

@keyframes statusPulse {
  0%, 100% { opacity: 1; }
  50% { opacity: 0.32; }
}

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

/* ---------- 10. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 120px;
  background-color: var(--ink-archive);
  border-top: var(--stroke-fat) solid var(--ink-grid);
}

.site-footer::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: min(340px, 42%);
  height: 3px;
  background-color: var(--amber);
  pointer-events: none;
}

.site-footer__grid {
  display: grid;
  grid-template-columns: 1.35fr 1fr 1.2fr 1.2fr;
  max-width: 1440px;
  margin: 0 auto;
  padding: 0 32px;
}

.footer-block {
  padding: 44px 30px 40px;
  border-left: var(--stroke) solid var(--ink-grid);
}

.footer-block:first-child {
  border-left: 0;
  padding-left: 0;
}

.footer-block--brand { padding-right: 36px; }

.footer-block__eyebrow {
  display: inline-block;
  margin-bottom: 18px;
  padding-bottom: 6px;
  border-bottom: var(--stroke) solid var(--ink-grid);
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--text-mute);
}

.footer-brand {
  max-width: none;
  font-family: var(--font-display);
  font-size: 24px;
  letter-spacing: 0.16em;
  line-height: 1.3;
  color: var(--flag-white);
  margin-bottom: 12px;
}

.footer-block__note {
  max-width: 30ch;
  font-size: 14px;
  line-height: 1.9;
  color: var(--text-mute);
}

.footer-stamp {
  display: inline-block;
  margin-top: 18px;
  padding: 5px 10px;
  background-color: var(--flag-yellow);
  color: var(--ink-void);
  font-family: var(--font-index);
  font-size: 10.5px;
  letter-spacing: 0.2em;
}

.footer-links {
  display: grid;
  gap: 2px;
}

.footer-links a {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(37, 57, 92, 0.9);
  color: var(--text-body);
  font-size: 15px;
  transition: color 0.16s ease, padding-left 0.16s ease;
}

.footer-links a::before {
  content: "";
  flex: 0 0 6px;
  width: 6px;
  height: 6px;
  background-color: var(--flag-blue);
}

.footer-links li:nth-child(2) a::before { background-color: var(--flag-white); }
.footer-links li:nth-child(3) a::before { background-color: var(--amber); }
.footer-links li:nth-child(4) a::before { background-color: var(--flag-yellow); }
.footer-links li:nth-child(5) a::before { background-color: var(--flag-green); }
.footer-links li:nth-child(6) a::before { background-color: var(--flag-red); }

.footer-links a:hover {
  color: var(--flag-white);
  padding-left: 6px;
}

.footer-meta {
  display: grid;
  gap: 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-mute);
}

.footer-meta li { max-width: none; }

.footer-meta__key {
  display: inline-block;
  margin-right: 8px;
  padding: 1px 7px;
  background-color: var(--flag-yellow);
  color: var(--ink-void);
  font-family: var(--font-index);
  font-size: 11px;
  letter-spacing: 0.12em;
}

.footer-contact {
  display: grid;
  gap: 2px;
  margin-bottom: 16px;
}

.footer-contact li {
  max-width: none;
  padding: 7px 0;
  border-bottom: 1px dashed rgba(37, 57, 92, 0.9);
  font-family: var(--font-index);
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--text-body);
  word-break: break-all;
}

.site-footer__base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 26px;
  padding: 20px 32px;
  background-color: var(--ink-void);
  border-top: var(--stroke-fat) solid var(--ink-grid);
}

.footer-legal {
  max-width: none;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}

.footer-legal-links {
  display: flex;
  flex-wrap: wrap;
  gap: 22px;
}

.footer-legal-links a {
  color: var(--text-body);
  font-size: 13px;
  border-bottom: 1px solid transparent;
  transition: color 0.16s ease, border-color 0.16s ease;
}

.footer-legal-links a:hover {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.footer-copy {
  max-width: none;
  margin-left: auto;
  font-family: var(--font-index);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-mute);
}

/* ---------- 11. 滚动显现 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.4s ease, transform 0.4s cubic-bezier(0.2, 0.7, 0.3, 1);
  transition-delay: calc(var(--stagger, 0) * 60ms);
}

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

html:not(.has-js) [data-reveal] {
  opacity: 1;
  transform: none;
}

/* ---------- 12. 响应式 ---------- */
@media (max-width: 1180px) {
  .footer-block { padding: 38px 22px 34px; }
  .site-footer__grid { padding: 0 24px; }
}

@media (max-width: 1080px) {
  .site-footer__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .footer-block {
    border-left: 0;
    border-top: var(--stroke) solid var(--ink-grid);
    padding: 30px 22px;
  }

  .footer-block:nth-child(1),
  .footer-block:nth-child(2) { border-top: 0; }

  .footer-block--brand { padding-right: 22px; }
}

@media (max-width: 1000px) {
  body {
    padding-left: 0;
    padding-top: 104px;
  }

  #main-content { scroll-margin-top: 116px; }

  .rail-plate {
    top: 0;
    right: 0;
    bottom: auto;
    left: 0;
    width: 100%;
    height: 56px;
    flex-direction: row;
    align-items: center;
    padding: 0 16px;
    border-right: 0;
    border-bottom: var(--stroke) solid var(--ink-grid);
  }

  .rail-plate::after {
    top: auto;
    bottom: 0;
    right: auto;
    left: 16px;
    width: 72px;
    height: 3px;
  }

  .rail-plate__head {
    flex: 1 1 auto;
    gap: 10px;
    padding: 0;
    border-bottom: 0;
  }

  .brand__glyph {
    flex-basis: 34px;
    width: 34px;
    height: 34px;
    font-size: 11px;
  }

  .brand__text {
    font-size: 16px;
    letter-spacing: 0.1em;
    overflow: hidden;
    text-overflow: ellipsis;
  }

  .rail-plate__meta,
  .rail-plate__foot { display: none; }

  .nav-toggle { display: inline-flex; }

  .site-nav {
    position: fixed;
    top: 104px;
    left: 0;
    right: 0;
    bottom: auto;
    max-height: calc(100vh - 104px);
    padding: 10px 0 18px;
    background-color: var(--ink-void);
    border-bottom: var(--stroke-fat) solid var(--ink-grid);
    overflow-y: auto;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transform: translateY(-12px);
    transition: transform 0.2s ease, opacity 0.2s ease, visibility 0.2s ease;
  }

  .site-nav[data-open] {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: none;
  }

  .site-nav__list { gap: 0; }

  .site-nav__link {
    grid-template-columns: 34px 1fr 12px;
    padding: 14px 20px;
    font-size: 16px;
    border-left: 0;
    border-bottom: 1px solid rgba(37, 57, 92, 0.7);
  }

  .site-nav__link[aria-current="page"] {
    border-left: 0;
    box-shadow: inset 4px 0 0 0 var(--swatch, var(--flag-blue));
  }

  .frame-bar {
    top: 56px;
    left: 0;
    height: 48px;
    padding: 0 16px;
    gap: 10px;
  }

  .site-header.is-condensed .frame-bar { height: 48px; }

  .frame-bar__status { display: none; }

  .frame-bar__actions { margin-left: auto; }

  .btn {
    padding: 8px 12px;
    font-size: 11.5px;
    letter-spacing: 0.08em;
    box-shadow: 3px 3px 0 rgba(3, 8, 18, 0.6);
  }

  .grid--2,
  .grid--3 { grid-template-columns: 1fr; }
}

@media (max-width: 680px) {
  body { font-size: 16px; line-height: 1.85; }

  .site-footer { margin-top: 88px; }

  .site-footer__grid {
    grid-template-columns: 1fr;
    padding: 0 18px;
  }

  .footer-block {
    padding: 26px 0;
    border-top: var(--stroke) solid var(--ink-grid);
  }

  .footer-block:nth-child(1) { border-top: 0; }

  .site-footer__base {
    padding: 18px;
    gap: 10px 18px;
  }

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

  .grid { gap: 16px; }

  .card { padding: 20px; }
}

/* ---------- 13. 降低动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.12s !important;
    transition-property: opacity, background-color, color, border-color !important;
  }

  [data-reveal] {
    transform: none !important;
    transition-delay: 0ms !important;
  }

  .btn:hover { transform: none; }
}