/* ============================================================
   云体育 · score-yun.com.cn
   /assets/site.css — 共享外壳：reset / 令牌 / 头部 / 页脚 / 通用组件
   直角 · 1px 网格 · 等宽索引 · 夜空蓝底 + 点状荧光强调
   ============================================================ */

/* ---------- 01 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 { margin: 0; }
ul, ol { padding: 0; 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%; }
details > summary { list-style: none; }
input, textarea, select { font: inherit; }

/* ---------- 02 设计令牌 ---------- */
:root {
  --c-void: #060B1C;
  --c-deep: #0D1530;
  --c-cloud: #F4F7FF;
  --c-cyan: #33F0D0;
  --c-orange: #FF7A33;
  --c-blue: #4D8BFF;
  --c-grid: #22304F;
  --c-muted: #9FB0D4;
  --c-teal: #0B3B38;
  --c-red: #FF4D6D;

  --f-mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
  --f-sans: "HarmonyOS Sans SC", "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", sans-serif;

  --fs-1: 0.75rem;    /* 12 */
  --fs-2: 0.875rem;   /* 14 */
  --fs-3: 1.125rem;   /* 18 */
  --fs-4: 1.75rem;    /* 28 */
  --fs-5: 3.5rem;     /* 56 */
  --fs-6: 5.5rem;     /* 88 */
  --fs-stat: 1.5rem;  /* 24 —— 版本号 / 统计值独立层级 */

  --sp-1: 4px;
  --sp-2: 8px;
  --sp-3: 12px;
  --sp-4: 16px;
  --sp-5: 24px;
  --sp-6: 32px;
  --sp-7: 48px;
  --sp-8: 72px;
  --sp-9: 112px;

  --w-max: 1240px;
  --radius: 2px;
  --header-h: 74px;
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
}

/* ---------- 03 基础排版与底板 ---------- */
body {
  min-height: 100vh;
  color: var(--c-cloud);
  font-family: var(--f-sans);
  font-size: 1rem;
  line-height: 1.75;
  background-color: var(--c-void);
  background-image:
    linear-gradient(rgba(34, 48, 79, 0.42) 1px, transparent 1px),
    linear-gradient(90deg, rgba(34, 48, 79, 0.42) 1px, transparent 1px),
    radial-gradient(120% 68% at 90% -12%, rgba(77, 139, 255, 0.20), transparent 62%),
    radial-gradient(96% 58% at 2% 6%, rgba(51, 240, 208, 0.10), transparent 64%);
  background-size: 72px 72px, 72px 72px, 100% 100%, 100% 100%;
  background-attachment: scroll, scroll, fixed, fixed;
  overflow-x: hidden;
}

h1, h2, h3, h4 {
  font-weight: 800;
  line-height: 1.12;
  letter-spacing: -0.01em;
}

p { max-width: 34em; }

a { transition: color 0.16s var(--ease), border-color 0.16s var(--ease); }

.num,
.mono,
[data-count] {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.02em;
}

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

::selection { background: var(--c-cyan); color: #04121C; }

[id] { scroll-margin-top: calc(var(--header-h) + 24px); }

/* 跳转链接 */
.skip-link {
  position: fixed;
  top: 0;
  left: 0;
  z-index: 300;
  padding: 12px 18px;
  background: var(--c-cyan);
  color: #04121C;
  font-size: var(--fs-2);
  font-weight: 700;
  border-radius: 0 0 var(--radius) 0;
  transform: translateY(-130%);
  transition: transform 0.18s var(--ease);
}
.skip-link:focus { transform: translateY(0); }

/* 布局容器 */
.wrap {
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  padding-inline: 20px;
}

.u-mono { font-family: var(--f-mono); font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.u-muted { color: var(--c-muted); }

/* ---------- 04 按钮与标签 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 16px;
  border: 1px solid transparent;
  border-radius: var(--radius);
  font-size: var(--fs-2);
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  transition: background 0.18s var(--ease), border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.btn-solid { background: var(--c-orange); color: #160A02; }
.btn-solid:hover { background: #FF9056; }
.btn-quiet { border-color: var(--c-grid); color: var(--c-muted); }
.btn-quiet:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.btn-ghost { border-color: var(--c-grid); color: var(--c-cloud); }
.btn-ghost:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.btn-block { width: 100%; }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 8px;
  border: 1px solid var(--c-grid);
  border-radius: var(--radius);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}
.tag--cyan { border-color: rgba(51, 240, 208, 0.45); color: var(--c-cyan); background: rgba(11, 59, 56, 0.5); }
.tag--orange { border-color: rgba(255, 122, 51, 0.45); color: var(--c-orange); background: rgba(255, 122, 51, 0.08); }
.tag--blue { border-color: rgba(77, 139, 255, 0.45); color: var(--c-blue); background: rgba(77, 139, 255, 0.08); }
.tag--red { border-color: rgba(255, 77, 109, 0.5); color: var(--c-red); background: rgba(255, 77, 109, 0.08); }

/* ---------- 05 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background: rgba(6, 11, 28, 0.9);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--c-grid);
}
.site-header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  height: 2px;
  width: min(42%, 440px);
  background: linear-gradient(90deg, var(--c-cyan), var(--c-blue) 64%, rgba(255, 122, 51, 0));
  pointer-events: none;
}

.header-inner {
  position: relative;
  display: flex;
  align-items: center;
  gap: var(--sp-4);
  width: 100%;
  max-width: var(--w-max);
  margin-inline: auto;
  min-height: var(--header-h);
  padding: 12px 20px;
  transition: min-height 0.22s var(--ease), padding 0.22s var(--ease);
}
.site-header.is-condensed .header-inner { min-height: 58px; padding-block: 6px; }

/* 品牌 */
.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  flex: 0 0 auto;
}
.brand-mark {
  display: grid;
  grid-template-columns: repeat(2, 7px);
  grid-template-rows: repeat(2, 7px);
  gap: 2px;
}
.brand-mark i { display: block; background: var(--c-cyan); }
.brand-mark i:nth-child(2) { background: var(--c-blue); }
.brand-mark i:nth-child(3) { background: var(--c-orange); }
.brand-mark i:nth-child(4) { background: var(--c-grid); }
.brand-text { display: flex; flex-direction: column; line-height: 1.05; }
.brand-name { font-size: 1.375rem; font-weight: 800; letter-spacing: 0.06em; color: var(--c-cloud); }
.brand-tagline {
  margin-top: 3px;
  font-family: var(--f-mono);
  font-size: 10px;
  letter-spacing: 0.22em;
  color: var(--c-muted);
}

/* 导航（桌面：左右分置，导航贴右） */
.site-nav { margin-left: auto; display: flex; align-items: center; }
.nav-list { display: flex; align-items: center; gap: clamp(10px, 1.7vw, 26px); }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 10px 2px;
  font-size: var(--fs-2);
  color: var(--c-muted);
}
.nav-num { font-family: var(--f-mono); font-size: 10px; letter-spacing: 0.08em; color: rgba(159, 176, 212, 0.45); }
.nav-text { font-weight: 600; }
.nav-link::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 4px;
  height: 2px;
  width: 0;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-blue));
  transition: width 0.22s var(--ease);
}
.nav-link:hover { color: var(--c-cloud); }
.nav-link:hover::after { width: 100%; }
.nav-link[aria-current="page"] { color: var(--c-cyan); }
.nav-link[aria-current="page"]::after { width: 100%; background: var(--c-cyan); }
.nav-link[aria-current="page"] .nav-num { color: var(--c-cyan); opacity: 0.75; }

.nav-foot { display: none; }

/* 右侧动作区 */
.header-actions { display: flex; align-items: center; gap: var(--sp-3); margin-left: var(--sp-4); }

/* 抽屉按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  padding: 9px 11px;
  border: 1px solid var(--c-grid);
  border-radius: var(--radius);
  background: rgba(13, 21, 48, 0.6);
  color: var(--c-cloud);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.nav-toggle:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.nav-toggle-bars { display: grid; gap: 4px; width: 15px; }
.nav-toggle-bars i { display: block; height: 1px; background: currentColor; transition: transform 0.2s var(--ease); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:first-child { transform: translateY(2.5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-bars i:last-child { transform: translateY(-2.5px) rotate(-45deg); }

/* 滚动进度线 */
.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  width: 100%;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--c-cyan), var(--c-blue) 55%, var(--c-orange));
  pointer-events: none;
}

html[data-nav-locked] { overflow: hidden; }

/* ---------- 06 页脚 ---------- */
.site-footer {
  margin-top: clamp(56px, 9vw, 112px);
  border-top: 1px solid var(--c-grid);
  background: linear-gradient(180deg, rgba(13, 21, 48, 0) 0%, rgba(13, 21, 48, 0.86) 30%, #0A1226 100%);
  color: var(--c-muted);
  font-size: var(--fs-2);
}
.site-footer .wrap { padding-block: clamp(40px, 6vw, 64px) 28px; }

.footer-grid {
  display: grid;
  gap: 36px 24px;
  grid-template-columns: 1fr;
}
.footer-brand { display: flex; flex-direction: column; gap: 14px; }
.footer-note { max-width: 32em; color: var(--c-muted); font-size: var(--fs-2); line-height: 1.7; }
.footer-note--mono {
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-muted);
  opacity: 0.7;
}
.footer-note--wide { margin-top: 20px; max-width: 46em; }

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--c-cyan);
}
.footer-links { display: grid; gap: 10px; }
.footer-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--c-muted);
  font-size: var(--fs-2);
}
.footer-link::before {
  content: "";
  width: 8px;
  height: 1px;
  background: var(--c-grid);
  transition: width 0.18s var(--ease), background 0.18s var(--ease);
}
.footer-link:hover { color: var(--c-cloud); }
.footer-link:hover::before { width: 16px; background: var(--c-cyan); }

.footer-contact {
  display: grid;
  gap: 20px;
  margin-top: clamp(32px, 5vw, 56px);
  padding-top: 24px;
  border-top: 1px solid var(--c-grid);
}
.contact-item { display: flex; flex-direction: column; align-items: flex-start; gap: 6px; }
.contact-label { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.2em; color: var(--c-cyan); }
.contact-value { color: var(--c-cloud); font-size: var(--fs-2); word-break: break-all; }
.contact-value.num { font-family: var(--f-mono); letter-spacing: 0.02em; }
.copy-btn {
  margin-top: 2px;
  padding: 6px 10px;
  border: 1px solid var(--c-grid);
  border-radius: var(--radius);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--c-muted);
  transition: border-color 0.18s var(--ease), color 0.18s var(--ease);
}
.copy-btn:hover { border-color: var(--c-cyan); color: var(--c-cyan); }
.copy-btn[data-copied="true"] { border-color: var(--c-orange); color: var(--c-orange); }

.footer-base {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 28px;
  margin-top: 28px;
  padding-top: 18px;
  border-top: 1px solid var(--c-grid);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--c-muted);
}
.footer-legal { opacity: 0.85; }

/* 返回顶部 */
.to-top {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 80;
  display: grid;
  place-items: center;
  width: 46px;
  height: 46px;
  border: 1px solid var(--c-grid);
  border-radius: var(--radius);
  background: rgba(13, 21, 48, 0.94);
  color: var(--c-cyan);
  font-size: 16px;
  line-height: 1;
  opacity: 0;
  visibility: hidden;
  transform: translateY(10px);
  transition: opacity 0.2s var(--ease), transform 0.2s var(--ease), visibility 0.2s linear, border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.to-top[data-visible="true"] { opacity: 1; visibility: visible; transform: none; }
.to-top:hover { border-color: var(--c-cyan); background: var(--c-teal); }

/* ---------- 07 通用页面组件 ---------- */
.section { padding-block: clamp(40px, 7vw, 88px); }
.section-head { margin-bottom: clamp(20px, 3vw, 36px); }
.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-cyan);
  text-transform: uppercase;
}
.eyebrow::before { content: ""; width: 22px; height: 1px; background: var(--c-cyan); }
.section-title { margin-top: 12px; font-size: clamp(1.5rem, 3.4vw, 2.25rem); }
.section-note { margin-top: 12px; color: var(--c-muted); font-size: var(--fs-2); max-width: 40em; }

.rule-slash {
  display: block;
  height: 1px;
  width: 100%;
  background: linear-gradient(90deg, var(--c-cyan), rgba(51, 240, 208, 0));
  transform: skewY(-0.5deg);
  transform-origin: left center;
}

.grid { display: grid; gap: 20px; grid-template-columns: 1fr; }
.grid--2 { grid-template-columns: 1fr; }
.grid--3 { grid-template-columns: 1fr; }
.grid--4 { grid-template-columns: 1fr; }

.card {
  position: relative;
  padding: 20px;
  border: 1px solid var(--c-grid);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(13, 21, 48, 0.92), rgba(6, 11, 28, 0.72));
  transition: transform 0.2s var(--ease), border-color 0.2s var(--ease);
}
.card::after {
  content: "";
  position: absolute;
  top: -1px;
  left: -1px;
  width: 26px;
  height: 2px;
  background: var(--c-cyan);
}
.card:hover { transform: translateY(-3px); border-color: rgba(51, 240, 208, 0.5); }
.card--accent::after { background: var(--c-orange); }
.card--accent:hover { border-color: rgba(255, 122, 51, 0.5); }
.card-head { display: flex; align-items: baseline; justify-content: space-between; gap: 12px; margin-bottom: 12px; }
.card-title { font-size: var(--fs-3); font-weight: 700; }
.card-meta { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.12em; color: var(--c-muted); }
.card-body { color: var(--c-muted); font-size: var(--fs-2); }

.stat { display: flex; flex-direction: column; gap: 4px; }
.stat-value {
  font-family: var(--f-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 4vw, var(--fs-stat));
  font-weight: 700;
  line-height: 1;
  color: var(--c-cloud);
}
.stat-label { font-family: var(--f-mono); font-size: 11px; letter-spacing: 0.16em; color: var(--c-muted); }
.stat-unit { font-family: var(--f-mono); font-size: var(--fs-2); color: var(--c-cyan); }

.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-block: 16px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}
.crumbs a:hover { color: var(--c-cyan); }
.crumb-sep { color: var(--c-grid); }

.toc { display: grid; gap: 2px; }
.toc-title {
  margin-bottom: 10px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--c-muted);
}
.toc-link {
  display: block;
  padding: 8px 0 8px 14px;
  border-left: 1px solid var(--c-grid);
  font-size: var(--fs-2);
  color: var(--c-muted);
}
.toc-link:hover { color: var(--c-cloud); }
.toc-link[aria-current="true"] { color: var(--c-cyan); border-left-color: var(--c-cyan); }

.table-wrap {
  overflow-x: auto;
  border: 1px solid var(--c-grid);
  background: var(--c-deep);
  -webkit-overflow-scrolling: touch;
}
.data-table { min-width: 560px; font-size: var(--fs-2); }
.data-table th {
  padding: 12px 14px;
  border-bottom: 1px solid var(--c-grid);
  background: #0A1226;
  font-family: var(--f-mono);
  font-size: 11px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--c-muted);
  text-align: left;
  white-space: nowrap;
}
.data-table td {
  padding: 14px;
  border-bottom: 1px solid rgba(34, 48, 79, 0.6);
  color: var(--c-cloud);
}
.data-table tbody tr:nth-child(even) { background: rgba(11, 59, 56, 0.28); }
.data-table tbody tr:hover { background: rgba(51, 240, 208, 0.08); }

.index-list { display: grid; border-top: 1px solid var(--c-grid); }
.index-item {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--c-grid);
}
.index-num { font-family: var(--f-mono); font-size: 12px; letter-spacing: 0.08em; color: var(--c-cyan); min-width: 26px; }
.index-text { color: var(--c-cloud); font-size: var(--fs-3); }

.qa {
  margin-bottom: 10px;
  border: 1px solid var(--c-grid);
  border-radius: var(--radius);
  background: rgba(13, 21, 48, 0.6);
}
.qa > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  cursor: pointer;
  font-size: var(--fs-3);
  font-weight: 600;
  color: var(--c-cloud);
}
.qa > summary::-webkit-details-marker { display: none; }
.qa > summary::after { content: "+"; font-family: var(--f-mono); color: var(--c-cyan); }
.qa[open] > summary::after { content: "–"; }
.qa-body { padding: 0 18px 18px; color: var(--c-muted); font-size: var(--fs-2); }

.callout {
  padding: 16px 18px;
  border: 1px solid var(--c-grid);
  border-left: 2px solid var(--c-orange);
  border-radius: var(--radius);
  background: rgba(255, 122, 51, 0.07);
  color: var(--c-muted);
  font-size: var(--fs-2);
}

/* 图像容器（页面阶段放图） */
.media {
  position: relative;
  overflow: hidden;
  border: 1px solid var(--c-grid);
  border-radius: var(--radius);
  background: linear-gradient(148deg, var(--c-deep), var(--c-void));
}
.media > img,
.media > picture > img,
.media > svg {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--1x1 { aspect-ratio: 1 / 1; }
.media--slanted { clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%); border-bottom: 0; }
.media--placeholder::after {
  content: attr(data-label);
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  padding: 12px;
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--c-muted);
  text-align: center;
}
.media-caption {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 12px;
  background: rgba(6, 11, 28, 0.86);
  border-top: 1px solid var(--c-grid);
  font-family: var(--f-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--c-muted);
}
.media-grid { display: grid; gap: 16px; grid-template-columns: 1fr; }

/* 显现动效 */
html.js [data-reveal] {
  opacity: 0;
  transform: translateY(14px);
  transition: opacity 0.28s var(--ease), transform 0.28s var(--ease);
}
html.js [data-reveal].is-in { opacity: 1; transform: none; }

/* ---------- 08 响应式 ---------- */
@media (min-width: 640px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .media-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-template-columns: repeat(3, minmax(0, 1fr)); }
}

@media (min-width: 768px) {
  .wrap { padding-inline: 32px; }
  .header-inner { padding-inline: 32px; }
  .to-top { right: 28px; bottom: 28px; }
}

@media (min-width: 1024px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
  .grid--aside { grid-template-columns: minmax(0, 1fr) 248px; gap: 40px; }
  .footer-grid { grid-template-columns: 1.7fr repeat(4, minmax(0, 1fr)); gap: 40px 28px; }
}

@media (min-width: 1200px) {
  .wrap { padding-inline: 48px; }
  .header-inner { padding-inline: 48px; }
}

@media (max-width: 1179px) {
  .header-actions .btn-quiet { display: none; }
}

/* 移动端抽屉 */
@media (max-width: 1023px) {
  :root { --header-h: 62px; }

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

  .site-nav {
    position: fixed;
    inset: 0;
    z-index: 90;
    display: flex;
    flex-direction: column;
    margin-left: 0;
    padding: calc(var(--header-h) + 18px) 20px 40px;
    border-left: 1px solid var(--c-grid);
    background:
      linear-gradient(158deg, rgba(51, 240, 208, 0.12) 0%, rgba(51, 240, 208, 0) 44%),
      linear-gradient(178deg, var(--c-void) 0%, var(--c-deep) 62%, var(--c-teal) 100%);
    transform: translateX(102%);
    visibility: hidden;
    overflow-y: auto;
    transition: transform 0.26s var(--ease), visibility 0.26s linear;
  }
  .site-nav[data-open="true"] { transform: translateX(0); visibility: visible; }

  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-item { border-bottom: 1px solid rgba(34, 48, 79, 0.85); }
  .nav-link {
    display: flex;
    align-items: baseline;
    gap: 14px;
    padding: 18px 2px;
    font-size: var(--fs-3);
    color: var(--c-cloud);
  }
  .nav-link::after { display: none; }
  .nav-num { font-size: 12px; color: var(--c-cyan); }
  .nav-link[aria-current="page"] { color: var(--c-cyan); }
  .nav-link[aria-current="page"] .nav-num { color: var(--c-orange); opacity: 1; }

  .nav-foot {
    display: flex;
    flex-direction: column;
    gap: 12px;
    margin-top: auto;
    padding-top: 32px;
  }

  .header-actions { margin-left: auto; gap: 10px; }
  .header-actions .btn { padding: 8px 12px; font-size: 12px; }
}

@media (max-width: 479px) {
  .brand-tagline { display: none; }
  .header-actions .btn-solid { padding: 8px 10px; }
}

/* ---------- 09 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;
  }
  html.js [data-reveal] { opacity: 1; transform: none; }
}