/* ==========================================================================
   K体育网址 · /assets/site.css
   共享外壳：重置 / 设计令牌 / 中文排版 / 头部轨道与胶囊导航 / 页脚 / 通用组件
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root {
  --ink: #05170F;
  --ink-2: #0A2A1E;
  --cyan: #2FF0C0;
  --green: #86FF5C;
  --pulse: #FF5330;
  --amber: #FFC24B;
  --white: #E9F6F1;
  --mute: #8FA9A0;
  --line: #173A2E;
  --paper: #F4FBF7;

  --rail-w: 88px;
  --topbar-h: 76px;
  --topbar-h-m: 60px;
  --shell-max: 1440px;
  --radius-card: 14px;
  --radius-pill: 999px;

  --font-display: "Oswald", "Archivo Narrow", "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;
  --font-mono: "IBM Plex Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

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

/* ---------- 2. 重置与基础 ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  font-family: var(--font-body);
  font-size: clamp(15px, 0.32vw + 14px, 17px);
  font-weight: 400;
  line-height: 1.75;
  color: var(--white);
  background-color: var(--ink);
  background-image:
    radial-gradient(120% 85% at 10% -12%, rgba(47, 240, 192, 0.10), transparent 62%),
    radial-gradient(95% 70% at 102% 0%, rgba(255, 83, 48, 0.08), transparent 58%),
    repeating-linear-gradient(90deg, rgba(23, 58, 46, 0.55) 0 1px, transparent 1px 140px);
  background-attachment: fixed;
  padding-left: var(--rail-w);
  padding-top: var(--topbar-h);
}

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

:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
  border-radius: 4px;
}

/* ---------- 3. 无障碍 ---------- */
.skip-link {
  position: fixed;
  left: calc(var(--rail-w) + 12px);
  top: 10px;
  z-index: 200;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: var(--ink);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

.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. 排版 ---------- */
.display {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.01em;
  color: var(--white);
}
.display--xl { font-size: clamp(44px, 8.4vw, 112px); }
.display--l  { font-size: clamp(34px, 5vw, 72px); }
.display--m  { font-size: clamp(26px, 3.4vw, 44px); }
.display--s  { font-size: clamp(20px, 1.8vw, 28px); }
.display--caps { text-transform: uppercase; letter-spacing: 0.06em; }

.eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}
.lede {
  margin: 0;
  max-width: 42ch;
  font-size: clamp(16px, 0.6vw + 14px, 18px);
  color: #CBE4DB;
}
.prose { max-width: 38em; }
.prose p + p { margin-top: 1.1em; }
.muted { color: var(--mute); }

.num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-feature-settings: "tnum" 1;
}

/* ---------- 5. 布局容器 ---------- */
.page-shell {
  width: 100%;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(28px, 4vw, 56px) clamp(18px, 3.4vw, 48px) clamp(56px, 7vw, 112px);
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 28px);
}
.span-3 { grid-column: span 3; }
.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-9 { grid-column: span 9; }
.span-12 { grid-column: span 12; }

.stack > * + * { margin-top: clamp(12px, 1.6vw, 22px); }

.rule {
  height: 1px;
  margin: 0;
  border: 0;
  background: var(--line);
}
.rule--tick {
  height: 11px;
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 12px);
  background-color: transparent;
}

/* ---------- 6. 按钮 / 标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 13px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 14.5px;
  font-weight: 600;
  letter-spacing: 0.02em;
  transition: background 0.2s var(--ease), color 0.2s var(--ease),
              border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.btn--primary { background: var(--pulse); color: var(--ink); }
.btn--primary:hover { background: #FF6C4C; transform: translateY(-1px); }
.btn--ghost {
  background: rgba(10, 42, 30, 0.6);
  border-color: var(--line);
  color: var(--white);
}
.btn--ghost:hover { border-color: var(--cyan); color: var(--cyan); }
.btn--quiet { padding: 8px 0; color: var(--cyan); }
.btn--quiet:hover { color: var(--green); }

.chip {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(5, 23, 15, 0.62);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--mute);
  white-space: nowrap;
}
.chip--live { background: var(--pulse); border-color: transparent; color: var(--ink); }
.chip--cyan { color: var(--cyan); border-color: rgba(47, 240, 192, 0.42); }
.chip--green { color: var(--green); border-color: rgba(134, 255, 92, 0.32); }
.chip--amber { color: var(--amber); border-color: rgba(255, 194, 75, 0.34); }

.dot-pulse {
  display: inline-block;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--pulse);
  animation: pulse 1.6s ease-in-out infinite;
}
@keyframes pulse {
  0%, 100% { opacity: 1; transform: scale(1); }
  50% { opacity: 0.42; transform: scale(0.8); }
}

/* ---------- 7. 面板块 / 表格 / 媒体容器 ---------- */
.surface {
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(180deg, rgba(10, 42, 30, 0.88), rgba(5, 23, 15, 0.74));
  box-shadow: 0 1px 0 rgba(233, 246, 241, 0.03) inset, 0 14px 32px rgba(0, 0, 0, 0.32);
  padding: clamp(16px, 2vw, 26px);
}

.data-table {
  width: 100%;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}
.data-table th {
  padding: 10px 12px;
  border-bottom: 1px solid var(--line);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mute);
  text-align: left;
  white-space: nowrap;
}
.data-table td {
  padding: 12px;
  border-bottom: 1px solid rgba(23, 58, 46, 0.72);
  font-size: 14px;
  vertical-align: middle;
}
.data-table tbody tr:hover td { background: rgba(47, 240, 192, 0.05); }

.media-frame {
  position: relative;
  overflow: hidden;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  background: linear-gradient(160deg, rgba(10, 42, 30, 0.92), rgba(5, 23, 15, 0.94));
  aspect-ratio: 16 / 9;
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: repeating-linear-gradient(180deg, rgba(233, 246, 241, 0.05) 0 1px, transparent 1px 3px);
  opacity: 0.7;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 3 / 4; }

.media-frame__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(1.05) contrast(1.04);
}
.media-frame__ph {
  position: absolute;
  inset: 10px;
  display: grid;
  place-items: center;
  border: 1px dashed rgba(47, 240, 192, 0.28);
  border-radius: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
}
.media-frame__tag {
  position: absolute;
  left: 12px;
  top: 12px;
  z-index: 2;
  padding: 4px 10px;
  border-radius: var(--radius-pill);
  background: rgba(5, 23, 15, 0.78);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--cyan);
}
.media-frame__caption {
  position: absolute;
  left: 0; right: 0; bottom: 0;
  z-index: 2;
  padding: 26px 14px 12px;
  font-size: 12.5px;
  color: #CBE4DB;
  background: linear-gradient(180deg, transparent, rgba(5, 23, 15, 0.88));
}
.media-grid {
  display: grid;
  gap: clamp(12px, 1.6vw, 20px);
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
}

/* ---------- 8. 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--mute);
}
.crumbs__item { display: inline-flex; align-items: center; gap: 8px; }
.crumbs__link { color: var(--mute); transition: color 0.2s var(--ease); }
.crumbs__link:hover { color: var(--cyan); }
.crumbs__sep { color: rgba(143, 169, 160, 0.5); }
.crumbs [aria-current="page"] { color: var(--cyan); }

/* ==========================================================================
   9. 头部：左侧品牌轨道 + 悬浮胶囊导航
   ========================================================================== */
.site-header { position: relative; z-index: 70; }

.brand-rail {
  position: fixed;
  top: 0;
  left: 0;
  bottom: 0;
  z-index: 74;
  width: var(--rail-w);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 18px;
  padding: 22px 0 20px;
  background:
    radial-gradient(120% 40% at 50% 0%, rgba(47, 240, 192, 0.10), transparent 70%),
    linear-gradient(180deg, rgba(10, 42, 30, 0.97), rgba(5, 23, 15, 0.99));
  border-right: 1px solid var(--line);
}

.brand {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 14px;
}
.brand__glyph {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid rgba(47, 240, 192, 0.6);
  border-radius: 13px;
  background: rgba(47, 240, 192, 0.07);
  box-shadow: 0 0 0 1px rgba(47, 240, 192, 0.08), 0 8px 20px rgba(0, 0, 0, 0.45);
  color: var(--cyan);
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  line-height: 1;
}
.brand__name {
  writing-mode: vertical-rl;
  text-orientation: upright;
  font-family: var(--font-display);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.32em;
  color: var(--white);
}

.brand-rail__track {
  position: relative;
  flex: 1 1 auto;
  min-height: 56px;
  width: 1px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-around;
  background: linear-gradient(180deg, transparent, var(--line) 12%, var(--line) 88%, transparent);
}
.brand-rail__dot {
  width: 5px;
  height: 5px;
  margin-left: -2px;
  border-radius: 50%;
  background: var(--mute);
  opacity: 0.55;
}
.brand-rail__dot:nth-child(2) {
  background: var(--cyan);
  opacity: 1;
  box-shadow: 0 0 0 4px rgba(47, 240, 192, 0.12);
}

.brand-rail__tagline {
  writing-mode: vertical-rl;
  font-size: 11px;
  line-height: 1.5;
  letter-spacing: 0.18em;
  color: var(--mute);
  text-align: center;
}
.brand-rail__live {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--pulse);
}

/* --- 顶部悬浮条 --- */
.nav-bar {
  position: fixed;
  top: 0;
  left: var(--rail-w);
  right: 0;
  z-index: 72;
  height: var(--topbar-h);
  display: flex;
  align-items: center;
  gap: 16px;
  padding: 0 clamp(16px, 2.4vw, 34px);
  background: linear-gradient(180deg, rgba(5, 23, 15, 0.94), rgba(5, 23, 15, 0.74));
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line);
}
.nav-bar__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  width: 100%;
  min-width: 0;
}

.nav-island {
  padding: 6px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(10, 42, 30, 0.72);
  box-shadow: 0 1px 0 rgba(233, 246, 241, 0.04) inset, 0 12px 26px rgba(0, 0, 0, 0.35);
}
.nav-island__list {
  display: flex;
  align-items: center;
  gap: 2px;
}
.nav-island__link {
  display: block;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  font-size: 14px;
  font-weight: 500;
  white-space: nowrap;
  color: var(--mute);
  transition: color 0.2s var(--ease), background 0.2s var(--ease);
}
.nav-island__link:hover { color: var(--white); background: rgba(47, 240, 192, 0.09); }
.nav-island__link[aria-current="page"] {
  background: var(--cyan);
  color: var(--ink);
  font-weight: 600;
}

.header-utility {
  display: flex;
  align-items: center;
  gap: 10px;
  flex-shrink: 0;
}
.pill {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-size: 13.5px;
  font-weight: 500;
  letter-spacing: 0.02em;
  white-space: nowrap;
  transition: background 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.pill--line {
  border-color: var(--line);
  background: rgba(10, 42, 30, 0.55);
  color: var(--white);
}
.pill--line:hover { border-color: var(--cyan); color: var(--cyan); }
.pill--pulse {
  background: var(--pulse);
  color: var(--ink);
  font-weight: 700;
}
.pill--pulse:hover { background: #FF6C4C; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(10, 42, 30, 0.92);
  color: var(--white);
  font-size: 12.5px;
  letter-spacing: 0.16em;
}
.nav-toggle__bars {
  display: flex;
  flex-direction: column;
  gap: 3px;
  width: 16px;
}
.nav-toggle__bars i {
  display: block;
  height: 1px;
  background: var(--cyan);
  transition: transform 0.24s var(--ease), opacity 0.24s var(--ease);
}
.nav-toggle[data-open] { border-color: rgba(47, 240, 192, 0.55); }
.nav-toggle[data-open] .nav-toggle__bars i:nth-child(1) { transform: translateY(4px) rotate(45deg); }
.nav-toggle[data-open] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.nav-toggle[data-open] .nav-toggle__bars i:nth-child(3) { transform: translateY(-4px) rotate(-45deg); }

.scroll-meter {
  position: fixed;
  top: calc(var(--topbar-h) - 2px);
  left: var(--rail-w);
  right: 0;
  z-index: 73;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), var(--green) 55%, var(--pulse));
  transform: scaleX(var(--scroll-progress, 0));
  transform-origin: 0 50%;
  transition: transform 0.12s linear;
  pointer-events: none;
}

/* ==========================================================================
   10. 页脚
   ========================================================================== */
.site-footer {
  position: relative;
  border-top: 1px solid var(--line);
  color: var(--white);
  background:
    radial-gradient(120% 110% at 0% 0%, rgba(47, 240, 192, 0.07), transparent 58%),
    radial-gradient(90% 90% at 100% 100%, rgba(255, 83, 48, 0.05), transparent 60%),
    linear-gradient(180deg, rgba(10, 42, 30, 0.92), rgba(5, 23, 15, 1));
}
.site-footer::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent 4%, var(--cyan), rgba(47, 240, 192, 0.18) 60%, transparent 96%);
  opacity: 0.6;
}

.footer-inner {
  display: grid;
  grid-template-columns: minmax(180px, 1.15fr) minmax(0, 2.1fr) minmax(210px, 1.3fr);
  gap: clamp(24px, 3.2vw, 56px);
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: clamp(34px, 4.6vw, 68px) clamp(18px, 3.4vw, 48px) clamp(22px, 3vw, 38px);
}

.footer-brand__mark {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.06em;
}
.footer-brand__glyph {
  display: grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border: 1px solid rgba(47, 240, 192, 0.6);
  border-radius: 9px;
  background: rgba(47, 240, 192, 0.07);
  color: var(--cyan);
  font-size: 16px;
  line-height: 1;
}
.footer-brand__line {
  margin: 14px 0 0;
  max-width: 26ch;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mute);
}
.footer-brand__rail {
  display: flex;
  align-items: center;
  gap: 6px;
  margin: 18px 0 0;
}
.footer-brand__rail i {
  display: block;
  width: 18px;
  height: 2px;
  background: var(--line);
}
.footer-brand__rail i:nth-child(2) { background: var(--cyan); width: 26px; }
.footer-brand__rail i:nth-child(4) { background: var(--pulse); width: 10px; }

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(16px, 2vw, 32px);
}
.footer-col__title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  font-weight: 500;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--mute);
}
.footer-links {
  display: flex;
  flex-direction: column;
  gap: 10px;
}
.footer-link {
  display: inline-block;
  font-size: 14.5px;
  color: var(--white);
  opacity: 0.86;
  transition: color 0.2s var(--ease), opacity 0.2s var(--ease), transform 0.2s var(--ease);
}
.footer-link:hover {
  color: var(--cyan);
  opacity: 1;
  transform: translateX(2px);
}

.footer-contact__list {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 8px 14px;
  font-size: 14px;
}
.footer-contact__list dt {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--mute);
  white-space: nowrap;
}
.footer-contact__list dd {
  margin: 0;
  overflow-wrap: anywhere;
}
.footer-note {
  margin: 14px 0 0;
  max-width: 34ch;
  font-size: 12.5px;
  line-height: 1.7;
  color: var(--mute);
}

.footer-bottom {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px 24px;
  max-width: var(--shell-max);
  margin: 0 auto;
  padding: 18px clamp(18px, 3.4vw, 48px) 26px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--mute);
}
.footer-copy { margin: 0; }
.footer-legal {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
}
.footer-legal .footer-link { font-size: 13px; }
.footer-icp {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
}

/* ==========================================================================
   11. 显现动效
   ========================================================================== */
.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.5s var(--ease), transform 0.5s var(--ease);
}
.js [data-reveal].is-in {
  opacity: 1;
  transform: none;
}

/* ==========================================================================
   12. 响应式
   ========================================================================== */
@media (max-width: 1240px) {
  .nav-island__link { padding: 9px 12px; font-size: 13.5px; }
  .pill { padding: 8px 13px; font-size: 12.5px; }
  .header-utility { gap: 8px; }
}

@media (max-width: 1080px) {
  .header-utility .pill--line:first-child { display: none; }
  .footer-inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.9fr);
  }
  .footer-contact { grid-column: 1 / -1; }
  .footer-note { max-width: 46ch; }
}

@media (max-width: 900px) {
  body {
    padding-left: 0;
    padding-top: var(--topbar-h-m);
  }

  .brand-rail {
    top: 0;
    left: 0;
    right: 0;
    bottom: auto;
    width: auto;
    height: var(--topbar-h-m);
    flex-direction: row;
    align-items: center;
    gap: 12px;
    padding: 0 96px 0 14px;
    border-right: 0;
    border-bottom: 1px solid var(--line);
  }
  .brand { flex-direction: row; gap: 10px; }
  .brand__glyph { width: 34px; height: 34px; border-radius: 10px; font-size: 17px; }
  .brand__name {
    writing-mode: horizontal-tb;
    font-size: 14px;
    letter-spacing: 0.18em;
  }
  .brand-rail__track,
  .brand-rail__live { display: none; }
  .brand-rail__tagline {
    writing-mode: horizontal-tb;
    margin-left: auto;
    padding-left: 12px;
    border-left: 1px solid var(--line);
    font-size: 11px;
    letter-spacing: 0.1em;
    white-space: nowrap;
  }

  .nav-bar {
    top: 0;
    left: auto;
    right: 0;
    height: var(--topbar-h-m);
    padding: 0 12px;
    background: transparent;
    border-bottom: 0;
    backdrop-filter: none;
    -webkit-backdrop-filter: none;
    justify-content: flex-end;
    pointer-events: none;
  }
  .nav-toggle {
    display: inline-flex;
    pointer-events: auto;
  }
  .nav-bar__inner {
    position: fixed;
    top: var(--topbar-h-m);
    left: 0;
    right: 0;
    z-index: 71;
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 16px;
    max-height: calc(100vh - var(--topbar-h-m));
    overflow-y: auto;
    padding: 18px 16px 26px;
    background: linear-gradient(180deg, rgba(10, 42, 30, 0.99), rgba(5, 23, 15, 0.99));
    border-bottom: 1px solid var(--line);
    box-shadow: 0 26px 54px rgba(0, 0, 0, 0.62);
    opacity: 0;
    visibility: hidden;
    transform: translateY(-10px);
    transition: opacity 0.24s var(--ease), transform 0.24s var(--ease), visibility 0.24s linear;
    pointer-events: none;
  }
  .nav-toggle[data-open] + .nav-bar__inner,
  .nav-toggle[aria-expanded="true"] + .nav-bar__inner {
    opacity: 1;
    visibility: visible;
    transform: none;
    pointer-events: auto;
  }

  .nav-island {
    padding: 0;
    border: 0;
    border-radius: 0;
    background: transparent;
    box-shadow: none;
  }
  .nav-island__list {
    flex-direction: column;
    align-items: stretch;
    gap: 2px;
  }
  .nav-island__link {
    padding: 13px 14px;
    border-left: 2px solid transparent;
    border-radius: 10px;
    font-size: 15.5px;
    white-space: normal;
  }
  .nav-island__link[aria-current="page"] {
    background: rgba(47, 240, 192, 0.13);
    border-left-color: var(--cyan);
    color: var(--cyan);
  }

  .header-utility {
    flex-direction: column;
    align-items: stretch;
    gap: 8px;
    padding-top: 4px;
    border-top: 1px solid var(--line);
    pointer-events: auto;
  }
  .header-utility .pill--line:first-child { display: inline-flex; }
  .pill { justify-content: center; padding: 12px 16px; font-size: 14px; }

  .scroll-meter {
    top: calc(var(--topbar-h-m) - 2px);
    left: 0;
  }

  .skip-link { left: 12px; }

  .grid-12 > [class*="span-"] { grid-column: 1 / -1; }

  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-icp { margin-left: 0; flex-basis: 100%; }
}

@media (max-width: 640px) {
  .brand-rail__tagline { display: none; }
  .brand-rail { padding-right: 88px; }

  .footer-inner { grid-template-columns: 1fr; }
  .footer-contact { grid-column: auto; }
  .footer-bottom { flex-direction: column; align-items: flex-start; gap: 10px; }
  .media-grid { grid-template-columns: repeat(auto-fit, minmax(160px, 1fr)); }
}

/* ==========================================================================
   13. 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;
  }
  .js [data-reveal] { opacity: 1; transform: none; }
  .scroll-meter { transition: none; }
  .dot-pulse { animation: none; }
}