/* ============================================================
   开云安装 · KAIYUN MOBILE
   /assets/site.css — 共享外壳：reset / tokens / 排版 / 页头 / 页脚 / 组件
   ============================================================ */

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

html { -webkit-text-size-adjust: 100%; }

@media (prefers-reduced-motion: no-preference) {
  html { scroll-behavior: smooth; }
}

body, h1, h2, h3, h4, h5, h6, p, ul, ol, li, figure, figcaption, blockquote, dl, dd { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
img { height: auto; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; }

/* ---------- 2. tokens ---------- */
:root {
  /* 品牌色板 */
  --night: #0A1230;      /* 夜场深靛 · 主背景 */
  --coal: #14161C;       /* 炭黑 · 卡片底 */
  --paper: #F4F6FA;      /* 纸白 · 正文 */
  --mist: #6B7690;       /* 雾灰蓝 · 描边 */
  --mist-lift: #9AA5BE;  /* 辅助文字（深色底提亮） */
  --cyan: #34E7E4;       /* 荧光青 · 主强调 */
  --orange: #FF8A3D;     /* 暖橙 · 数字与指向 */
  --rose: #FF4D8D;       /* 玫红 · 极小块点缀 */
  --edge: #1C5C6B;       /* 深青描边 */
  --amber: #FFC48A;      /* 琥珀浅 · 次级填充 */
  --ink: #05070D;        /* 墨黑 · 页脚 */
  --on-cyan: #04131A;
  --on-amber: #2B1500;

  /* 结构色 */
  --line: rgba(28, 92, 107, .62);
  --line-soft: rgba(107, 118, 144, .26);
  --surface: rgba(20, 22, 28, .88);

  /* 字体 */
  --font-head: "Oswald", "Archivo Narrow", "Arial Narrow", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-body: "Source Han Sans SC", "Noto 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, monospace;

  /* 尺度 */
  --wrap: 1240px;
  --gutter: clamp(18px, 4.4vw, 56px);
  --sect: clamp(72px, 9.5vw, 140px);

  /* 动效 */
  --dur: .24s;
  --ease: cubic-bezier(.2, .7, .3, 1);
}

/* ---------- 3. 基础与中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--night);
  background-image:
    linear-gradient(rgba(52, 231, 228, .038) 1px, transparent 1px),
    linear-gradient(90deg, rgba(52, 231, 228, .038) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  background-position: center top;
  color: var(--paper);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.85;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-head);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: .015em;
  text-wrap: balance;
}

h1 { font-size: clamp(2.1rem, 5.6vw, 3.25rem); }
h2 { font-size: clamp(1.55rem, 3.6vw, 2rem); }
h3 { font-size: 1.375rem; line-height: 1.32; }
h4 { font-size: 1.125rem; line-height: 1.4; }

p { max-width: 38em; }
strong, b { font-weight: 700; }
small { font-size: .82em; }

.page-title { font-size: clamp(2.1rem, 5.6vw, 3.25rem); }
.section-title { font-size: clamp(1.55rem, 3.6vw, 2rem); }
.block-title { font-size: 1.375rem; line-height: 1.32; }

.lede {
  font-size: clamp(1.02rem, 1.6vw, 1.2rem);
  line-height: 1.8;
  color: var(--paper);
}

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

.muted { color: var(--mist-lift); }
.mono {
  font-family: var(--font-mono);
  font-weight: 600;
  letter-spacing: .04em;
  font-variant-numeric: tabular-nums;
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1;
  letter-spacing: .28em;
  text-transform: uppercase;
  color: var(--cyan);
}
.eyebrow::before {
  content: "";
  width: 26px;
  height: 1px;
  background: currentColor;
  flex: none;
}

.rule { height: 1px; background: var(--line); }

a { transition: color var(--dur) var(--ease); }
::selection { background: var(--cyan); color: var(--on-cyan); }

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

.visually-hidden {
  position: absolute !important;
  width: 1px; height: 1px;
  margin: -1px; padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

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

.section { padding-block: var(--sect); }
.section--tight { padding-block: clamp(48px, 6vw, 84px); }
.section--coal { background: var(--coal); border-block: 1px solid var(--line); }
.section--line { border-top: 1px solid var(--line); }

.section--paper {
  background: var(--paper);
  color: #151A26;
  border-block: 1px solid #D7DCE6;
}
.section--paper h1, .section--paper h2, .section--paper h3 { color: #0C1120; }
.section--paper .muted { color: #5A6478; }
.section--paper .eyebrow { color: #0E7C86; }
.section--paper .note-plate { color: #4C5568; background: rgba(255, 138, 61, .1); }
.section--paper .figure-frame__caption { color: #4C5568; }

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: clamp(14px, 2vw, 32px);
  padding-bottom: clamp(20px, 2.6vw, 32px);
  border-bottom: 1px solid var(--line);
  margin-bottom: clamp(28px, 4vw, 52px);
}
.section-head__text { max-width: 46em; }
.section-head__text > * + * { margin-top: .7em; }

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2.4vw, 32px);
}

.grid-cards {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: clamp(14px, 2vw, 24px);
}

.page-shell {
  display: grid;
  grid-template-columns: minmax(0, 3fr) minmax(0, 9fr);
  gap: clamp(24px, 4vw, 64px);
  align-items: start;
}

.content-col { min-width: 0; }

/* 粘性赛事标签轨道 */
.rail {
  position: sticky;
  top: 84px;
  align-self: start;
  border-top: 2px solid var(--cyan);
  padding-top: 18px;
}
.rail__title {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1;
  letter-spacing: .24em;
  text-transform: uppercase;
  color: var(--mist-lift);
  margin-bottom: 16px;
}
.rail__list { display: flex; flex-direction: column; }
.rail__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 16px;
  line-height: 1.2;
  letter-spacing: .05em;
  color: var(--paper);
  transition: color var(--dur) var(--ease), padding-left var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.rail__index {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--mist);
  flex: none;
}
.rail__link:hover,
.rail__link:focus-visible { color: var(--cyan); padding-left: 8px; }
.rail__link[aria-current="page"] {
  color: var(--cyan);
  padding-left: 8px;
  border-bottom-color: var(--rose);
}
.rail__link[aria-current="page"] .rail__index { color: var(--orange); }

/* ---------- 5. 通用按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 20px;
  border: 1px solid transparent;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 13px;
  line-height: 1;
  letter-spacing: .16em;
  white-space: nowrap;
  cursor: pointer;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease),
              border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn::after {
  content: "→";
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  transition: transform var(--dur) var(--ease);
}
.btn:hover::after { transform: translateX(4px); }
.btn:active { transform: translateY(1px); }

.btn--primary { background: var(--cyan); color: var(--on-cyan); border-color: var(--cyan); }
.btn--primary:hover { background: var(--paper); border-color: var(--paper); color: #0B1220; }

.btn--ghost { background: transparent; color: var(--paper); border-color: var(--line); }
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }

.btn--amber { background: var(--amber); color: var(--on-amber); border-color: var(--amber); }
.btn--amber:hover { background: var(--orange); border-color: var(--orange); color: #2B1500; }

.section--paper .btn--ghost { color: #151A26; border-color: #C3CAD8; }
.section--paper .btn--ghost:hover { border-color: #0E7C86; color: #0E7C86; }

/* ---------- 6. 标签牌 / 面板 / 说明牌 ---------- */
.label-chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 5px 10px;
  border: 1px solid rgba(52, 231, 228, .45);
  background: rgba(52, 231, 228, .08);
  color: var(--cyan);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1.2;
  letter-spacing: .16em;
  text-transform: uppercase;
}
.label-chip--rose {
  color: var(--rose);
  border-color: rgba(255, 77, 141, .5);
  background: rgba(255, 77, 141, .09);
}
.label-chip--amber {
  color: var(--amber);
  border-color: rgba(255, 196, 138, .45);
  background: rgba(255, 196, 138, .09);
}

.panel {
  border: 1px solid var(--edge);
  background: var(--surface);
  padding: clamp(20px, 3vw, 34px);
}
.panel--night {
  background: linear-gradient(155deg, rgba(20, 22, 28, .94) 0%, rgba(10, 18, 48, .92) 100%);
}
.panel--paper {
  background: var(--paper);
  color: #151A26;
  border-color: #D7DCE6;
}
.panel--stack {
  box-shadow: 8px 8px 0 rgba(28, 92, 107, .34), 16px 16px 0 rgba(5, 7, 13, .55);
}

.note-plate {
  margin-top: 14px;
  padding: 12px 14px;
  border-left: 2px solid var(--orange);
  background: rgba(255, 138, 61, .07);
  color: var(--mist-lift);
  font-size: 14px;
  line-height: 1.7;
  max-width: 44em;
}

/* ---------- 7. 数据卡 ---------- */
.stat-card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px;
  border: 1px solid var(--line);
  background: var(--coal);
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.stat-card::before {
  content: "";
  position: absolute;
  left: 0; top: 0;
  width: 3px; height: 0;
  background: var(--cyan);
  transition: height var(--dur) var(--ease);
}
.stat-card:hover { border-color: var(--edge); transform: translateY(-3px); }
.stat-card:hover::before { height: 100%; }

.stat-card__label {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1.3;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist-lift);
}
.stat-card__value {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(2rem, 5vw, 3.25rem);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
  transition: transform var(--dur) var(--ease);
}
.stat-card:hover .stat-card__value { transform: translateY(-2px); }
.stat-card__hint {
  font-size: 14px;
  line-height: 1.7;
  color: var(--mist-lift);
  max-width: 26em;
}

/* ---------- 8. 图片容器（页面阶段放置占位） ---------- */
.figure-frame {
  position: relative;
  margin: 0;
  border: 1px solid var(--edge);
  background: var(--coal);
  overflow: hidden;
}
.figure-frame__media {
  position: relative;
  display: block;
  aspect-ratio: 16 / 10;
  background:
    radial-gradient(circle at 28% 18%, rgba(52, 231, 228, .16), transparent 58%),
    linear-gradient(135deg, #101B3A 0%, #0A1230 52%, #14161C 100%);
}
.figure-frame__media--wide { aspect-ratio: 21 / 9; }
.figure-frame__media--tall { aspect-ratio: 3 / 4; }
.figure-frame__media img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.figure-frame__media::after {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 2;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(52, 231, 228, .09) 1px, transparent 1px),
    linear-gradient(90deg, rgba(52, 231, 228, .09) 1px, transparent 1px);
  background-size: 36px 36px, 36px 36px;
}
.figure-frame__caption {
  padding: 12px 16px;
  border-top: 1px solid var(--line);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .06em;
  color: var(--mist-lift);
}

/* ---------- 9. 面包屑 ---------- */
.breadcrumbs {
  border-bottom: 1px solid var(--line-soft);
  padding-block: 14px;
}
.breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist-lift);
}
.breadcrumbs__list li { display: flex; align-items: center; gap: 8px; }
.breadcrumbs__list li + li::before {
  content: "/";
  color: var(--edge);
}
.breadcrumbs__list a { color: var(--paper); }
.breadcrumbs__list a:hover { color: var(--cyan); }
.breadcrumbs__list [aria-current="page"] { color: var(--mist-lift); }

/* ---------- 10. 显现动画 ---------- */
.reveal {
  opacity: 0;
  transform: translateY(18px);
  transition: opacity .44s var(--ease), transform .44s var(--ease);
}
.reveal.is-visible { opacity: 1; transform: translateY(0); }

/* ---------- 11. 跳过链接 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -90px;
  z-index: 300;
  padding: 13px 20px;
  background: var(--cyan);
  color: var(--on-cyan);
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 13px;
  line-height: 1;
  letter-spacing: .12em;
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 12. 页头 ---------- */
.site-header {
  position: relative;
  z-index: 80;
  border-bottom: 1px solid var(--line);
  background: linear-gradient(180deg, rgba(5, 7, 13, .94) 0%, rgba(10, 18, 48, .88) 100%);
}

.header-topbar {
  border-bottom: 1px solid var(--line-soft);
  background: rgba(5, 7, 13, .62);
}
.header-topbar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 40px;
}
.topbar-mark {
  display: flex;
  align-items: center;
  gap: 10px;
  max-width: 100%;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist-lift);
  max-width: 70%;
}
.topbar-mark__dot {
  flex: none;
  width: 7px; height: 7px;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--cyan);
  animation: ky-pulse 2.6s var(--ease) infinite;
}
@keyframes ky-pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .3; }
}
.util-link {
  flex: none;
  padding-bottom: 3px;
  border-bottom: 1px solid var(--rose);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--paper);
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}
.util-link:hover { color: var(--rose); border-color: var(--rose); }

.masthead { padding: clamp(26px, 4.6vw, 56px) 0 clamp(20px, 3vw, 40px); }
.masthead__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
}
.masthead-brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 12px;
}
.masthead-brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(2.5rem, 7.8vw, 4.75rem);
  line-height: .92;
  letter-spacing: .06em;
  color: var(--paper);
  text-shadow: 0 0 48px rgba(52, 231, 228, .18);
  transition: color var(--dur) var(--ease);
}
.masthead-brand:hover .masthead-brand__name { color: var(--cyan); }
.masthead-brand__sub {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .32em;
  text-transform: uppercase;
  color: var(--mist-lift);
}

/* 粘性导航带 */
.nav-band {
  position: sticky;
  top: 0;
  z-index: 90;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: rgba(8, 14, 34, .94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}
.nav-band__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto minmax(0, 1fr);
  align-items: center;
  gap: clamp(12px, 2vw, 28px);
  min-height: 64px;
}
.nav-band__meta {
  justify-self: start;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--mist-lift);
}
.nav-band__cta { justify-self: end; }
.nav-band__cta .btn { padding: 11px 16px; font-size: 12px; }

.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(4px, 1.6vw, 24px);
}
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: 15px;
  line-height: 1.2;
  letter-spacing: .12em;
  color: var(--paper);
  transition: color var(--dur) var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 2px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: 0 50%;
  transition: transform var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.site-nav__link:hover,
.site-nav__link:focus-visible { color: var(--cyan); }
.site-nav__link:hover::after,
.site-nav__link:focus-visible::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--cyan); }
.site-nav__link[aria-current="page"]::after {
  transform: scaleX(1);
  background: var(--rose);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 10px 13px;
  border: 1px solid var(--line);
  color: var(--paper);
  cursor: pointer;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); color: var(--cyan); }
.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__text {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1;
  letter-spacing: .2em;
  text-transform: uppercase;
}
.site-header[data-open] .nav-toggle { border-color: var(--cyan); color: var(--cyan); }
.site-header[data-open] .nav-toggle__bars { background: transparent; }
.site-header[data-open] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* 滚动进度条 */
.scroll-meter {
  position: fixed;
  top: 0; left: 0;
  z-index: 200;
  width: 100%;
  height: 2px;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan) 0%, var(--cyan) 55%, var(--rose) 78%, var(--orange) 100%);
  pointer-events: none;
}

/* ---------- 13. 页脚 ---------- */
.site-footer {
  background: var(--ink);
  border-top: 1px solid var(--edge);
  color: var(--paper);
  padding-top: clamp(48px, 7vw, 88px);
}
.footer-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 2fr);
  gap: clamp(28px, 5vw, 72px);
  padding-bottom: clamp(34px, 5vw, 56px);
}
.footer-brand__name {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.6rem, 3vw, 2.25rem);
  line-height: 1;
  letter-spacing: .06em;
  color: var(--paper);
}
.footer-brand__sub {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--mist-lift);
}
.footer-brand__desc {
  margin-top: 14px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist-lift);
}
.footer-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(18px, 3vw, 40px);
}
.footer-col__title {
  margin-bottom: 16px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.footer-col__list { display: flex; flex-direction: column; gap: 9px; }
.footer-link {
  display: inline-block;
  font-size: 15px;
  line-height: 1.6;
  color: var(--paper);
  transition: color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.footer-link:hover,
.footer-link:focus-visible { color: var(--cyan); transform: translateX(3px); }

.footer-contact {
  border-top: 1px solid var(--line-soft);
  padding-top: clamp(22px, 3vw, 34px);
  padding-bottom: clamp(26px, 4vw, 42px);
}
.footer-contact p {
  max-width: none;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist-lift);
}
.footer-note { margin-top: 8px; }

.footer-bottom {
  border-top: 1px solid var(--line-soft);
  background: rgba(0, 0, 0, .42);
}
.footer-bottom__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px 20px;
  min-height: 62px;
  padding-block: 12px;
}
.footer-legal,
.footer-copy {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--mist-lift);
}

/* ---------- 14. 响应式 ---------- */
@media (max-width: 1080px) {
  .page-shell { grid-template-columns: 1fr; }
  .rail {
    position: static;
    border-top: 1px solid var(--line);
    border-bottom: 1px solid var(--line-soft);
    padding-bottom: 14px;
  }
  .rail__list {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 0 20px;
  }
  .rail__link { border-bottom: 0; padding: 8px 0; }
  .footer-inner { grid-template-columns: 1fr; }
}

@media (max-width: 900px) {
  .nav-band__inner {
    grid-template-columns: auto minmax(0, 1fr);
    gap: 12px;
    min-height: 58px;
  }
  .nav-band__meta { display: none; }
  .nav-toggle { display: inline-flex; justify-self: start; }
  .nav-band__cta { justify-self: end; }
  .nav-band__cta .btn { padding: 10px 13px; font-size: 11px; letter-spacing: .1em; }
  .nav-band__cta .btn::after { display: none; }

  .site-nav {
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    display: none;
    background: rgba(5, 7, 13, .98);
    border-bottom: 1px solid var(--edge);
    padding: 4px var(--gutter) 20px;
    max-height: calc(100vh - 60px);
    overflow-y: auto;
  }
  .site-header[data-open] .site-nav { display: block; }
  .site-nav__list { flex-direction: column; align-items: stretch; gap: 0; }
  .site-nav__item { border-bottom: 1px solid var(--line-soft); }
  .site-nav__item:last-child { border-bottom: 0; }
  .site-nav__link {
    display: block;
    width: 100%;
    padding: 16px 0;
    font-size: 17px;
    letter-spacing: .1em;
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] {
    padding-left: 12px;
    border-left: 2px solid var(--rose);
  }
}

@media (max-width: 680px) {
  body { font-size: 16px; line-height: 1.8; }
  .header-topbar__inner { min-height: 38px; }
  .topbar-mark { font-size: 10px; letter-spacing: .14em; max-width: 62%; }
  .masthead { padding: 26px 0 22px; }
  .masthead-brand__sub { font-size: 10px; letter-spacing: .2em; }
  .footer-grid { grid-template-columns: 1fr; gap: 26px; }
  .footer-bottom__inner { justify-content: flex-start; }
  .panel--stack { box-shadow: 5px 5px 0 rgba(28, 92, 107, .34), 10px 10px 0 rgba(5, 7, 13, .5); }
}

/* ---------- 15. 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
  }
  .reveal { opacity: 1; transform: none; }
  .stat-card:hover { transform: none; }
  .stat-card:hover .stat-card__value { transform: none; }
  .footer-link:hover { transform: none; }
}