/* ============================================================
   尊国体育 · 共享样式表 /assets/site.css
   深墨绿基底 + 荧光青轨迹 + 琥珀提示 + 运动红切换态
   ============================================================ */

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

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

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

ul, ol { list-style: none; }

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

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

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

table { border-collapse: collapse; width: 100%; }

:where(a, button, summary, [tabindex]):focus-visible {
  outline: 2px solid var(--cyan-glow);
  outline-offset: 2px;
  border-radius: 1px;
}

/* ---------- 2. 变量 ---------- */
:root {
  --ink-900: #06110E;
  --ink-800: #0B1A16;
  --ink-700: #12241F;
  --line-mint: #1E332C;
  --text-hi: #E9FFF7;
  --text-mid: #93ADA4;
  --cyan-glow: #2BF5C8;
  --amber-signal: #FFB63D;
  --sport-red: #FF4B3E;
  --paper-050: #EEF5F1;

  --shell-max: 1440px;
  --gutter: clamp(18px, 3.4vw, 56px);
  --rail-w: 38px;
  --radius: 2px;
  --ease: cubic-bezier(.22, .61, .36, 1);

  --font-sans: "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei",
    "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system,
    "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas,
    "Liberation Mono", "Courier New", monospace;
}

/* ---------- 3. 基础排版 ---------- */
body {
  background-color: var(--ink-900);
  color: var(--text-hi);
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.75;
  letter-spacing: .01em;
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4 {
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.03em;
  color: var(--text-hi);
}

h1 { font-size: clamp(34px, 5vw, 64px); }
h2 { font-size: clamp(24px, 3vw, 34px); }
h3 { font-size: clamp(18px, 1.6vw, 20px); }
h4 { font-size: 16px; letter-spacing: -.01em; }

p { color: var(--text-mid); }
strong { color: var(--text-hi); font-weight: 800; }

::selection { background: var(--cyan-glow); color: var(--ink-900); }

.eyebrow {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .28em;
  color: var(--cyan-glow);
}

.numeric {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 900;
  letter-spacing: -.02em;
}

.prose { max-width: 68ch; }
.prose p + p { margin-top: 1em; }
.prose h2, .prose h3 { margin-top: 1.6em; margin-bottom: .5em; }
.prose ul { margin-top: 1em; display: grid; gap: .5em; }
.prose li {
  position: relative;
  padding-left: 18px;
  color: var(--text-mid);
}
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 8px;
  height: 1px;
  background: var(--cyan-glow);
}

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

.grid { display: grid; gap: clamp(16px, 2.2vw, 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--asym { grid-template-columns: 5fr 7fr; }
.grid--asym-rev { grid-template-columns: 7fr 5fr; }

.band {
  width: 100%;
  padding-block: clamp(32px, 5vw, 72px);
  border-top: 1px solid var(--line-mint);
}
.band--paper {
  background: var(--paper-050);
  color: #0A1A15;
  border-top-color: transparent;
}
.band--paper h1, .band--paper h2, .band--paper h3, .band--paper h4 { color: #0A1A15; }
.band--paper p { color: #35544A; }
.band--paper strong { color: #0A1A15; }

.rule {
  height: 1px;
  border: 0;
  background: var(--line-mint);
}

.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px 24px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line-mint);
  margin-bottom: clamp(20px, 3vw, 36px);
}
.section-head__title { font-size: clamp(22px, 2.6vw, 32px); }
.section-head__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--text-mid);
}

/* ---------- 5. 通用组件 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 12px 22px;
  border: 1px solid var(--line-mint);
  border-radius: var(--radius);
  background: var(--ink-800);
  color: var(--text-hi);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: .06em;
  transition: transform .24s var(--ease), border-color .24s var(--ease),
    color .24s var(--ease), background-color .24s var(--ease);
}
.btn:hover { transform: translateY(-2px); border-color: var(--cyan-glow); color: var(--cyan-glow); }
.btn--cyan { background: var(--cyan-glow); border-color: var(--cyan-glow); color: var(--ink-900); }
.btn--cyan:hover { background: #5CFFDB; border-color: #5CFFDB; color: var(--ink-900); }
.btn--amber { border-color: var(--amber-signal); color: var(--amber-signal); background: transparent; }
.btn--amber:hover { background: var(--amber-signal); color: var(--ink-900); }
.btn--ghost { background: transparent; }
.btn--sm { padding: 8px 14px; font-size: 12.5px; letter-spacing: .1em; }

.card {
  position: relative;
  background: var(--ink-800);
  border: 1px solid var(--line-mint);
  border-radius: var(--radius);
  padding: clamp(18px, 2.4vw, 28px);
  transition: transform .24s var(--ease), border-color .24s var(--ease),
    box-shadow .24s var(--ease);
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--cyan-glow);
  box-shadow: 0 20px 44px -30px rgba(43, 245, 200, .6);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line-mint);
  border-radius: var(--radius);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--text-mid);
  white-space: nowrap;
}
.tag--cyan { color: var(--cyan-glow); border-color: rgba(43, 245, 200, .45); }
.tag--amber { color: var(--amber-signal); border-color: rgba(255, 182, 61, .45); }
.tag--red { color: var(--sport-red); border-color: rgba(255, 75, 62, .45); }

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--text-mid);
}
.crumbs__link { color: var(--text-mid); transition: color .2s var(--ease); }
.crumbs__link:hover { color: var(--cyan-glow); }
.crumbs__sep { color: var(--line-mint); }
.crumbs__current { color: var(--text-hi); }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line-mint);
  background: var(--ink-800);
}
.table { min-width: 560px; font-size: 14px; }
.table th,
.table td {
  text-align: left;
  padding: 12px 16px;
  border-bottom: 1px solid var(--line-mint);
  vertical-align: top;
}
.table th {
  background: var(--ink-700);
  color: var(--text-mid);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .16em;
}
.table tbody tr:nth-child(even) { background: var(--ink-700); }
.table tbody tr:last-child td { border-bottom: 0; }

.media {
  position: relative;
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  background: var(--ink-700);
  border: 1px solid var(--line-mint);
  border-radius: var(--radius);
}
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--21x9 { aspect-ratio: 21 / 9; }
.media__img { width: 100%; height: 100%; object-fit: cover; }
.media--plate {
  background-image:
    repeating-linear-gradient(90deg, rgba(30, 51, 44, .95) 0 1px, transparent 1px 40px),
    repeating-linear-gradient(180deg, rgba(30, 51, 44, .95) 0 1px, transparent 1px 40px);
  background-color: var(--ink-700);
}
.media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--text-mid);
}

/* ---------- 6. 头部 ---------- */
.skip-link {
  position: fixed;
  top: 8px;
  left: 8px;
  z-index: 200;
  padding: 10px 16px;
  background: var(--cyan-glow);
  color: var(--ink-900);
  font-size: 14px;
  font-weight: 800;
  border-radius: var(--radius);
  transform: translateY(-180%);
  transition: transform .2s var(--ease);
}
.skip-link:focus { transform: none; }

.site-header {
  position: sticky;
  top: 0;
  z-index: 80;
  background: rgba(6, 17, 14, .94);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--line-mint);
}

.header-inner {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 12px var(--gutter);
  min-height: 78px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(16px, 3vw, 48px);
}

.header-start {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.6vw, 22px);
  flex: 0 0 auto;
  min-width: 0;
}

.header-end {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 26px);
  flex: 0 0 auto;
}

/* 品牌 */
.brand { display: flex; align-items: center; gap: 12px; }
.brand-mark {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 46px;
  height: 38px;
  padding: 0 8px;
  background: var(--cyan-glow);
  color: var(--ink-900);
  font-size: 15px;
  font-weight: 900;
  letter-spacing: .02em;
  clip-path: polygon(0 0, 100% 0, 100% 72%, 82% 100%, 0 100%);
  transition: background-color .24s var(--ease);
}
.brand:hover .brand-mark { background: var(--amber-signal); }
.brand-text { display: flex; flex-direction: column; line-height: 1.25; }
.brand-name { font-size: 17px; font-weight: 900; letter-spacing: .02em; color: var(--text-hi); }
.brand-line {
  margin-top: 2px;
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--text-mid);
  white-space: nowrap;
}

/* 规格徽标 */
.spec-chip {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 6px 12px;
  border: 1px solid var(--line-mint);
  border-radius: var(--radius);
  background: var(--ink-800);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--text-mid);
  white-space: nowrap;
}
.spec-chip__dot {
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  background: var(--amber-signal);
  box-shadow: 0 0 0 3px rgba(255, 182, 61, .16);
}
.spec-chip__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--text-hi);
}

/* 中部数据轨迹 */
.header-trace {
  flex: 1 1 auto;
  min-width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  opacity: .6;
}
.header-trace svg { width: 100%; height: 100%; }
.header-trace__grid {
  fill: none;
  stroke: var(--line-mint);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}
.header-trace__flow {
  fill: none;
  stroke: var(--cyan-glow);
  stroke-width: 1;
  opacity: .75;
  vector-effect: non-scaling-stroke;
}
.header-trace__node { fill: var(--amber-signal); }

/* 导航 */
.site-nav {
  display: flex;
  align-items: center;
  gap: clamp(12px, 1.8vw, 26px);
}
.site-nav__list {
  display: flex;
  align-items: center;
  gap: clamp(10px, 1.5vw, 24px);
}
.site-nav__item { position: relative; }
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 8px 2px;
  font-size: 13.5px;
  font-weight: 600;
  letter-spacing: .04em;
  color: var(--text-mid);
  white-space: nowrap;
  transition: color .2s var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 2px;
  height: 1px;
  background: var(--cyan-glow);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform .24s var(--ease);
}
.site-nav__link:hover { color: var(--text-hi); }
.site-nav__link:hover::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"] { color: var(--cyan-glow); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }
.site-nav__link[aria-current="page"]::before {
  content: "";
  position: absolute;
  left: 50%;
  top: -2px;
  width: 4px;
  height: 4px;
  background: var(--amber-signal);
  transform: translateX(-50%);
}

/* 双路径开关 */
.path-switch {
  display: flex;
  align-items: stretch;
  border: 1px solid var(--line-mint);
  border-radius: var(--radius);
  background: var(--ink-800);
  overflow: hidden;
}
.path-switch__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 8px 14px;
  min-width: 0;
  transition: background-color .24s var(--ease);
}
.path-switch__item + .path-switch__item { border-left: 1px solid var(--line-mint); }
.path-switch__label {
  font-size: 13px;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--text-hi);
  transition: color .24s var(--ease);
}
.path-switch__hint {
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--text-mid);
  white-space: nowrap;
}
.path-switch__item:hover { background: rgba(43, 245, 200, .07); }
.path-switch__item:hover .path-switch__label { color: var(--cyan-glow); }
.path-switch__item[data-active] { background: rgba(43, 245, 200, .09); }
.path-switch__item[data-active] .path-switch__label { color: var(--cyan-glow); }
.path-switch__item[data-active]::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--sport-red);
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 12px;
  border: 1px solid var(--line-mint);
  border-radius: var(--radius);
  background: var(--ink-800);
  transition: border-color .24s var(--ease);
}
.nav-toggle__bars { display: flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle__bars i {
  display: block;
  height: 1px;
  background: var(--text-hi);
  transition: transform .24s var(--ease), opacity .2s var(--ease);
}
.nav-toggle__text {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--text-mid);
}
.site-header[data-open] .nav-toggle { border-color: var(--cyan-glow); }
.site-header[data-open] .nav-toggle__bars i:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle__bars i:nth-child(2) { opacity: 0; }
.site-header[data-open] .nav-toggle__bars i:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }

/* ---------- 7. 期次标尺与返回顶部 ---------- */
.period-rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  z-index: 70;
  width: var(--rail-w);
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 18px 0 16px;
  background: rgba(6, 17, 14, .92);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  border-right: 1px solid var(--line-mint);
}
.period-rail__cap {
  writing-mode: vertical-rl;
  font-size: 10px;
  letter-spacing: .34em;
  color: var(--text-mid);
  white-space: nowrap;
}
.period-rail__track {
  position: relative;
  flex: 1 1 auto;
  width: 9px;
  margin: 6px 0;
  background-image: repeating-linear-gradient(
    180deg,
    var(--line-mint) 0 1px,
    transparent 1px 14px
  );
}
.period-rail__fill {
  position: absolute;
  left: 50%;
  top: 0;
  width: 1px;
  height: 0;
  transform: translateX(-50%);
  background: linear-gradient(180deg, var(--cyan-glow), rgba(43, 245, 200, .25));
  box-shadow: 0 0 8px rgba(43, 245, 200, .7);
}
.period-rail__readout {
  font-family: var(--font-mono);
  font-size: 10px;
  color: var(--cyan-glow);
  font-variant-numeric: tabular-nums;
}
.period-rail__count {
  font-family: var(--font-mono);
  font-size: 9px;
  letter-spacing: -.02em;
  color: var(--text-mid);
  font-variant-numeric: tabular-nums;
}

.to-top {
  position: fixed;
  right: clamp(14px, 2vw, 28px);
  bottom: clamp(14px, 2vw, 28px);
  z-index: 75;
  width: 46px;
  height: 46px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  background: var(--ink-800);
  border: 1px solid var(--line-mint);
  border-radius: var(--radius);
  color: var(--text-hi);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: opacity .24s var(--ease), transform .24s var(--ease),
    visibility .24s var(--ease), border-color .24s var(--ease), color .24s var(--ease);
}
.to-top[data-visible] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--cyan-glow); color: var(--cyan-glow); }
.to-top__glyph { font-size: 16px; line-height: 1; }

/* ---------- 8. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: clamp(56px, 8vw, 110px);
  background: var(--ink-800);
  border-top: 1px solid var(--line-mint);
}

.footer-trace {
  height: 54px;
  border-bottom: 1px solid var(--line-mint);
  overflow: hidden;
}
.footer-trace svg { width: 100%; height: 100%; }
.footer-trace__grid {
  fill: none;
  stroke: var(--line-mint);
  stroke-width: 1;
  vector-effect: non-scaling-stroke;
}
.footer-trace__flow {
  fill: none;
  stroke: var(--cyan-glow);
  stroke-width: 1.2;
  opacity: .55;
  vector-effect: non-scaling-stroke;
}

.footer-inner {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: clamp(34px, 5vw, 64px) var(--gutter);
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1.9fr) auto;
  gap: clamp(28px, 5vw, 72px);
}

.footer-brand__mark {
  display: inline-block;
  font-size: 26px;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--text-hi);
  transition: color .24s var(--ease);
}
.footer-brand__mark:hover { color: var(--cyan-glow); }
.footer-brand__name {
  margin-top: 8px;
  font-size: 12px;
  letter-spacing: .32em;
  color: var(--text-mid);
}
.footer-brand__summary {
  margin-top: 18px;
  max-width: 34ch;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--text-mid);
}
.footer-brand__region {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: var(--amber-signal);
}

.footer-annotation {
  writing-mode: vertical-rl;
  align-self: stretch;
  padding-left: 14px;
  border-left: 1px solid var(--line-mint);
  font-size: 11px;
  letter-spacing: .36em;
  color: var(--text-mid);
  white-space: nowrap;
}

.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(20px, 3vw, 40px);
}
.footer-col__title {
  margin-bottom: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .24em;
  color: var(--cyan-glow);
}
.footer-list { display: grid; gap: 10px; }
.footer-list__link {
  font-size: 14.5px;
  color: var(--text-mid);
  transition: color .2s var(--ease);
}
.footer-list__link:hover { color: var(--text-hi); }

.footer-note {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--text-mid);
}

.footer-meta {
  border-top: 1px solid var(--line-mint);
  background: var(--ink-900);
}
.footer-meta__inner {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding: 16px var(--gutter);
  display: flex;
  flex-wrap: wrap;
  gap: 6px 28px;
  align-items: baseline;
  justify-content: space-between;
  font-size: 12.5px;
  color: var(--text-mid);
}
.footer-meta__inner + .footer-meta__inner { padding-top: 0; }
.footer-meta__inner--base {
  border-top: 1px solid var(--line-mint);
  padding-top: 16px;
  padding-bottom: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
}
.footer-meta__line { color: var(--text-mid); }
.footer-meta__line--soft { color: var(--text-mid); opacity: .78; }
.footer-meta__icp { color: var(--text-mid); }
.footer-meta__note { color: var(--line-mint); }
.footer-meta__copy { color: var(--text-mid); }

/* ---------- 9. JS 状态与动效 ---------- */
html.nav-open { overflow: hidden; }

.has-js [data-reveal] {
  opacity: 0;
  transform: translate3d(0, 18px, 0);
  transition: opacity .5s var(--ease), transform .5s var(--ease);
}
.has-js [data-reveal][data-revealed] {
  opacity: 1;
  transform: none;
}

@keyframes panel-in {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: none; }
}

/* ---------- 10. 响应式 ---------- */
@media (min-width: 1100px) {
  body { padding-left: var(--rail-w); }
}

@media (min-width: 1200px) {
  .period-rail { display: flex; }
}

@media (max-width: 1199.98px) {
  .header-trace { display: none; }
  .path-switch { display: none; }
  .spec-chip__label { display: none; }
}

@media (max-width: 1023.98px) {
  .header-inner { min-height: 64px; padding-block: 10px; }
  .nav-toggle { display: inline-flex; }

  .site-nav { display: none; }

  .site-header[data-open] .site-nav {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    position: absolute;
    top: 100%;
    left: 0;
    right: 0;
    max-height: 78vh;
    overflow: auto;
    padding: 8px var(--gutter) 24px;
    background: var(--ink-800);
    border-top: 1px solid var(--line-mint);
    border-bottom: 1px solid var(--line-mint);
    box-shadow: 0 30px 60px -34px rgba(0, 0, 0, .95);
    animation: panel-in .24s var(--ease) both;
  }

  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
    counter-reset: nav;
  }
  .site-nav__item { border-bottom: 1px solid var(--line-mint); }
  .site-nav__item::before {
    content: counter(nav, decimal-leading-zero);
    counter-increment: nav;
    position: absolute;
    left: 2px;
    top: 20px;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--text-mid);
  }
  .site-nav__link {
    display: block;
    padding: 15px 4px 15px 40px;
    font-size: 17px;
    font-weight: 800;
    color: var(--text-hi);
  }
  .site-nav__link::after { display: none; }
  .site-nav__link::before { display: none; }
  .site-nav__link[aria-current="page"] {
    color: var(--cyan-glow);
    background: linear-gradient(90deg, rgba(43, 245, 200, .1), transparent 72%);
  }

  .site-header[data-open] .path-switch {
    display: flex;
    flex-direction: column;
    align-items: stretch;
    margin-top: 18px;
    border-top: 0;
    background: var(--ink-700);
  }
  .site-header[data-open] .path-switch__item { padding: 14px 16px; }
  .site-header[data-open] .path-switch__item + .path-switch__item {
    border-left: 0;
    border-top: 1px solid var(--line-mint);
  }
  .site-header[data-open] .path-switch__hint { white-space: normal; }

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

@media (max-width: 899.98px) {
  .footer-inner { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .footer-annotation { display: none; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand__summary { max-width: 46ch; }
}

@media (max-width: 639.98px) {
  .brand-line { display: none; }
  .brand-mark { min-width: 40px; height: 34px; font-size: 13px; }
  .brand-name { font-size: 15px; }
  .spec-chip { padding: 5px 9px; font-size: 10.5px; }
  .grid--3 { grid-template-columns: minmax(0, 1fr); }
  .footer-cols { grid-template-columns: minmax(0, 1fr); gap: 24px; }
}

@media (max-width: 479.98px) {
  .brand-text { display: none; }
  .spec-chip { display: none; }
  .to-top { width: 42px; height: 42px; }
}

/* ---------- 11. 焦点与减弱动效 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *,
  *::before,
  *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
  }
  .has-js [data-reveal] { opacity: 1; transform: none; }
  .skip-link { transition: none; }
}