/* ============================================================
   爱游戏官网 · 共享站点样式 /assets/site.css
   深场底 + 面板分层 + 坐标刻度 + 编辑部非对称网格
   ============================================================ */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; }
body, h1, h2, h3, h4, p, ul, ol, li, figure, blockquote, dl, dd, details, summary { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; }
button, input, select, textarea { font: inherit; color: inherit; }
a { color: inherit; text-decoration: none; }
table { border-collapse: collapse; }
[hidden] { display: none !important; }

/* ---------- 变量 ---------- */
:root {
  --bg: #0A1013;
  --panel: #121C21;
  --raise: #1B282E;
  --green: #19C37D;
  --blue: #2E9BFF;
  --lime: #C9FF3D;
  --alert: #FF6B3D;
  --ink: #E9F3F4;
  --ink-soft: #C6D6DA;
  --muted: #9DB2B7;
  --line: #24343A;
  --pad-x: clamp(16px, 2.4vw, 36px);
  --max: 1440px;
  --header-h: 76px;
  --font-display: "PingFang SC", "Microsoft YaHei", system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-body: system-ui, -apple-system, "PingFang SC", "Microsoft YaHei", "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
  --shadow-float: 0 18px 48px rgba(0, 0, 0, .45);
}

/* ---------- 基础排版 ---------- */
html { scroll-padding-top: calc(var(--header-h) + 24px); }
@media (prefers-reduced-motion: no-preference) { html { scroll-behavior: smooth; } }
body {
  background-color: var(--bg);
  background-image: radial-gradient(120% 80% at 82% -10%, rgba(46, 155, 255, .12), transparent 60%),
                    radial-gradient(90% 60% at 6% 4%, rgba(25, 195, 125, .10), transparent 62%);
  background-repeat: no-repeat;
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
::selection { background: var(--lime); color: #06120C; }

h1, h2, h3, h4 { font-family: var(--font-display); font-weight: 800; letter-spacing: -.02em; line-height: 1.1; font-stretch: 90%; }
h1 { font-size: clamp(2.2rem, 5.4vw, 4.5rem); }
h2 { font-size: clamp(1.6rem, 3vw, 2.75rem); }
h3 { font-size: clamp(1.15rem, 1.8vw, 1.5rem); }
h4 { font-size: 1.0625rem; line-height: 1.35; }
p { max-width: 68ch; }
strong { color: var(--lime); font-weight: 700; }
hr, .rule { border: 0; border-top: 1px solid var(--line); margin: 0; }

:focus-visible { outline: 2px solid var(--lime); outline-offset: 3px; }
a:focus-visible, button:focus-visible, summary:focus-visible { outline-offset: 2px; }

/* ---------- 工具类 ---------- */
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; }
.lime { color: var(--lime); }
.alert { color: var(--alert); }
.muted-text { color: var(--muted); }
.stack > * + * { margin-top: 1rem; }
.status-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; background: currentColor; vertical-align: middle; }

/* ---------- 跳转链接 ---------- */
.skip-link {
  position: absolute; left: 16px; top: -72px; z-index: 300;
  padding: 10px 18px; background: var(--lime); color: #06120C;
  font-size: 14px; font-weight: 700; letter-spacing: .04em;
  transition: top .18s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- 容器与主区 ---------- */
.container { width: 100%; max-width: var(--max); margin: 0 auto; padding-left: var(--pad-x); padding-right: var(--pad-x); }
.container--narrow { max-width: 900px; }
.site-main { display: block; padding-top: calc(var(--header-h) + 28px); }
.site-main--overlay { padding-top: 0; }
#main-content { scroll-margin-top: calc(var(--header-h) + 24px); }

/* ---------- 12 列网格 ---------- */
.grid-12 { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(16px, 2vw, 28px); }
.span-2 { grid-column: span 2; }
.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-10 { grid-column: span 10; }
.span-12 { grid-column: span 12; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 10px 16px; border: 1px solid var(--line); background: var(--panel);
  color: var(--ink); font-size: 13px; font-weight: 600; letter-spacing: .04em;
  cursor: pointer; transition: background-color .18s ease, border-color .18s ease, color .18s ease, transform .18s ease;
}
.btn:hover { border-color: var(--green); color: var(--lime); }
.btn:active { transform: translateY(1px); }
.btn-primary { background: var(--green); border-color: var(--green); color: #04140C; }
.btn-primary:hover { background: #22d98c; border-color: #22d98c; color: #04140C; }
.btn-ghost { background: transparent; border-color: var(--line); color: var(--ink); }
.btn-ghost:hover { border-color: var(--blue); color: var(--blue); }
.btn-block { width: 100%; }
.btn-row { display: flex; flex-wrap: wrap; gap: 12px; align-items: center; }

/* ============================================================
   页头
   ============================================================ */
.site-header {
  position: fixed; inset: 0 0 auto 0; z-index: 100;
  background: transparent;
  border-bottom: 1px solid transparent;
  transition: background-color .25s ease, border-color .25s ease, backdrop-filter .25s ease;
}
.site-header::before {
  content: ""; position: absolute; inset: 0; pointer-events: none;
  background: linear-gradient(to bottom, rgba(10, 16, 19, .78), rgba(10, 16, 19, 0));
  transition: opacity .25s ease; opacity: 1;
}
.site-header::after {
  content: ""; position: absolute; left: 0; right: 0; bottom: 0; height: 5px; pointer-events: none;
  background-image: repeating-linear-gradient(to right, var(--line) 0 1px, transparent 1px 30px);
  opacity: 0; transition: opacity .25s ease;
}
.site-header.is-scrolled { background: rgba(10, 16, 19, .94); border-bottom-color: var(--line); backdrop-filter: blur(12px); }
.site-header.is-scrolled::before { opacity: 0; }
.site-header.is-scrolled::after { opacity: .4; }

.scroll-progress {
  position: absolute; left: 0; right: 0; bottom: -1px; height: 2px; z-index: 4;
  background: linear-gradient(90deg, var(--green), var(--blue) 55%, var(--lime));
  transform: scaleX(0); transform-origin: 0 50%; pointer-events: none;
}

.header-inner {
  position: relative; z-index: 3;
  max-width: var(--max); margin: 0 auto; padding: 0 var(--pad-x);
  height: var(--header-h);
  display: flex; align-items: center; gap: clamp(14px, 2vw, 32px);
}

/* 品牌 */
.brand { display: inline-flex; align-items: center; gap: 12px; flex: 0 0 auto; }
.brand-mark {
  position: relative; padding-left: 14px;
  font-family: var(--font-display); font-weight: 800; font-size: 21px; letter-spacing: -.02em; color: var(--ink);
}
.brand-mark::before {
  content: ""; position: absolute; left: 0; top: 50%; margin-top: -3px;
  width: 6px; height: 6px; background: var(--lime);
}
.brand-meta { display: flex; flex-direction: column; line-height: 1.3; }
.brand-badge { font-family: var(--font-mono); font-size: 11px; letter-spacing: .1em; color: var(--green); text-transform: uppercase; }
.brand-tagline { font-size: 11.5px; letter-spacing: .02em; color: var(--muted); white-space: nowrap; }

/* 主导航 */
.site-nav { flex: 1 1 auto; display: flex; justify-content: center; }
.nav-list { display: flex; align-items: center; gap: 2px; }
.nav-item { position: relative; }
.nav-link {
  display: inline-block; padding: 8px 11px;
  font-size: 13px; font-weight: 600; letter-spacing: .06em; color: var(--muted);
  border-bottom: 1px solid transparent;
  transition: color .18s ease, border-color .18s ease;
}
.nav-link:hover { color: var(--ink); }
.nav-link[aria-current="page"] { color: var(--lime); border-bottom-color: var(--lime); }

.nav-actions { display: none; }

/* 页头工具区 */
.header-tools { display: flex; align-items: center; gap: 10px; flex: 0 0 auto; }
.header-cta { padding: 9px 14px; }

/* 赛季切换 */
.season-switch { position: relative; }
.season-picker { position: relative; }
.season-summary {
  display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 12px; border: 1px solid var(--line); background: rgba(18, 28, 33, .7);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--ink);
  cursor: pointer; list-style: none; transition: border-color .18s ease, color .18s ease;
}
.season-summary::-webkit-details-marker { display: none; }
.season-summary:hover { border-color: var(--green); color: var(--lime); }
.season-key { color: var(--muted); }
.season-value { color: var(--lime); }
.season-value::after { content: "▾"; margin-left: 6px; color: var(--muted); font-size: 10px; }
.season-picker[open] .season-summary { border-color: var(--green); }
.season-picker-panel {
  position: absolute; right: 0; top: calc(100% + 10px); z-index: 30;
  display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 6px;
  width: 232px; padding: 10px;
  background: var(--raise); border: 1px solid var(--line); box-shadow: var(--shadow-float);
}
.season-btn {
  padding: 8px 6px; border: 1px solid transparent; background: var(--panel); color: var(--muted);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .04em; cursor: pointer;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease;
}
.season-btn:hover { color: var(--ink); border-color: var(--line); }
.season-btn[aria-pressed="true"] { background: rgba(201, 255, 61, .12); color: var(--lime); border-color: rgba(201, 255, 61, .45); }

/* 移动菜单按钮 */
.nav-toggle {
  display: none; align-items: center; gap: 8px;
  height: 40px; padding: 0 12px;
  background: transparent; border: 1px solid var(--line); color: var(--ink);
  font-size: 12.5px; letter-spacing: .08em; cursor: pointer;
  transition: border-color .18s ease, color .18s ease;
}
.nav-toggle:hover { border-color: var(--green); }
.site-header[data-open] .nav-toggle { border-color: var(--green); color: var(--lime); }
.nav-toggle-bars { position: relative; display: block; width: 16px; height: 2px; background: currentColor; transition: background-color .18s ease; }
.nav-toggle-bars::before, .nav-toggle-bars::after {
  content: ""; position: absolute; left: 0; width: 16px; height: 2px; background: currentColor;
  transition: transform .18s ease;
}
.nav-toggle-bars::before { top: -5px; }
.nav-toggle-bars::after { top: 5px; }
.site-header[data-open] .nav-toggle-bars { background: transparent; }
.site-header[data-open] .nav-toggle-bars::before { transform: translateY(5px) rotate(45deg); }
.site-header[data-open] .nav-toggle-bars::after { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle-label { font-family: var(--font-mono); }

/* 遮罩 */
.nav-scrim { position: fixed; inset: var(--header-h) 0 0; z-index: 4; background: rgba(4, 8, 10, .62); }
body.nav-open { overflow: hidden; }

/* ============================================================
   页脚
   ============================================================ */
.site-footer { position: relative; background: var(--panel); border-top: 1px solid var(--line); margin-top: clamp(48px, 7vw, 96px); }
.site-footer::before {
  content: ""; position: absolute; top: -1px; left: 0; width: min(240px, 42vw); height: 1px;
  background: linear-gradient(90deg, var(--lime), var(--green), transparent);
}
.footer-inner { max-width: var(--max); margin: 0 auto; padding: clamp(40px, 6vw, 76px) var(--pad-x) 32px; }

.footer-top { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: clamp(24px, 3vw, 48px) 24px; }
.footer-brand { grid-column: 1 / span 4; }
.brand--footer { flex-direction: column; align-items: flex-start; gap: 8px; }
.brand--footer .brand-mark { font-size: 26px; }
.brand--footer .brand-meta { gap: 2px; }
.footer-claim { margin-top: 18px; max-width: 40ch; color: var(--ink-soft); font-size: 14.5px; line-height: 1.7; }
.footer-note { margin-top: 8px; font-family: var(--font-mono); font-size: 12.5px; color: var(--muted); }

.footer-cols { grid-column: 5 / -1; display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 24px; }
.footer-col-title {
  font-family: var(--font-mono); font-size: 12px; font-weight: 600; letter-spacing: .16em;
  text-transform: uppercase; color: var(--muted); padding-bottom: 12px; border-bottom: 1px solid var(--line);
}
.footer-list { margin-top: 14px; display: grid; gap: 10px; }
.footer-link { font-size: 14.5px; color: var(--ink-soft); transition: color .18s ease; }
.footer-link:hover { color: var(--lime); }

.footer-contact {
  display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: 20px 24px;
  margin-top: clamp(28px, 4vw, 52px); padding-top: clamp(20px, 3vw, 32px); border-top: 1px solid var(--line);
}
.contact-line { display: flex; flex-direction: column; gap: 6px; }
.contact-label { font-family: var(--font-mono); font-size: 11.5px; letter-spacing: .14em; color: var(--muted); text-transform: uppercase; }
.contact-value { font-size: 14.5px; color: var(--ink); word-break: break-word; }
.footer-contact-note { grid-column: 1 / -1; font-size: 13px; color: var(--muted); max-width: 60ch; }

.footer-legal {
  display: flex; flex-wrap: wrap; align-items: baseline; justify-content: space-between; gap: 12px 24px;
  margin-top: clamp(24px, 3vw, 40px); padding-top: 18px; border-top: 1px solid var(--line);
  font-size: 12.5px; color: var(--muted);
}
.footer-footnote { max-width: 52ch; }
.footer-legal-links { display: flex; flex-wrap: wrap; gap: 18px; font-family: var(--font-mono); letter-spacing: .04em; }
.footer-icp, .footer-copy { color: var(--muted); }

/* ============================================================
   通用内容组件
   ============================================================ */
.eyebrow {
  display: inline-flex; align-items: center; gap: 8px;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .18em; text-transform: uppercase; color: var(--muted);
}
.section-head {
  display: flex; align-items: baseline; gap: 16px; flex-wrap: wrap;
  padding-bottom: 14px; border-bottom: 1px solid var(--line); margin-bottom: clamp(20px, 2.6vw, 32px);
}
.section-index { font-family: var(--font-mono); font-size: 12px; letter-spacing: .14em; color: var(--lime); }
.lede { font-size: clamp(17px, 1.6vw, 20px); line-height: 1.7; color: var(--ink-soft); max-width: 54ch; }

.prose { max-width: 60ch; }
.prose p + p { margin-top: 1.1em; }
.prose h2 { margin: 1.8em 0 .6em; }
.prose h3 { margin: 1.5em 0 .5em; }
.prose ul { margin: 1em 0; display: grid; gap: .5em; }
.prose ul li { position: relative; padding-left: 20px; }
.prose ul li::before { content: ""; position: absolute; left: 0; top: .72em; width: 10px; height: 1px; background: var(--green); }
.prose a { color: var(--blue); border-bottom: 1px solid rgba(46, 155, 255, .45); }
.prose a:hover { color: var(--lime); border-bottom-color: var(--lime); }
.prose blockquote { border-left: 2px solid var(--lime); padding-left: 16px; color: var(--ink-soft); }

.breadcrumbs { display: flex; flex-wrap: wrap; gap: 8px; font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--muted); }
.breadcrumbs li { display: inline-flex; align-items: center; }
.breadcrumbs li + li::before { content: "/"; margin-right: 8px; color: var(--line); }
.breadcrumbs a:hover { color: var(--lime); }

/* 面板与卡片 */
.panel { background: var(--panel); border: 1px solid var(--line); padding: clamp(18px, 2.2vw, 28px); }
.card {
  position: relative; background: var(--panel); border: 1px solid var(--line);
  padding: clamp(18px, 2.2vw, 26px);
  transition: border-color .2s ease, box-shadow .2s ease, transform .2s ease;
}
.card:hover { border-color: var(--green); box-shadow: var(--shadow-float); transform: translateY(-2px); }
.card--raise { background: var(--raise); }

/* 数值 */
.metric { display: flex; flex-direction: column; gap: 6px; }
.metric-value { font-family: var(--font-mono); font-size: clamp(28px, 3.4vw, 44px); line-height: 1.05; color: var(--lime); letter-spacing: -.02em; }
.metric-label { font-family: var(--font-mono); font-size: 12px; letter-spacing: .1em; color: var(--muted); text-transform: uppercase; }
.metric-delta { font-family: var(--font-mono); font-size: 13px; color: var(--green); }
.metric-delta--alert { color: var(--alert); }

/* 表格 */
.table-scroll { overflow-x: auto; border: 1px solid var(--line); background: var(--panel); }
.data-table { width: 100%; min-width: 560px; font-family: var(--font-mono); font-size: 14px; }
.data-table caption { padding: 14px 16px; text-align: left; font-size: 12px; letter-spacing: .12em; color: var(--muted); text-transform: uppercase; }
.data-table th, .data-table td { padding: 12px 16px; border-bottom: 1px solid var(--line); text-align: left; }
.data-table thead th { font-size: 12px; font-weight: 600; letter-spacing: .08em; color: var(--muted); text-transform: uppercase; background: var(--raise); }
.data-table td.num, .data-table th.num { text-align: right; font-variant-numeric: tabular-nums; }
.data-table tbody tr:hover td { background: var(--raise); }
.data-table tbody tr:last-child td { border-bottom: 0; }

/* 标签 */
.tag {
  display: inline-flex; align-items: center; gap: 6px;
  padding: 3px 8px; border: 1px solid var(--line);
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--muted);
}
.tag--lime { color: var(--lime); border-color: rgba(201, 255, 61, .42); }
.tag--green { color: var(--green); border-color: rgba(25, 195, 125, .42); }
.tag--blue { color: var(--blue); border-color: rgba(46, 155, 255, .42); }
.tag--alert { color: var(--alert); border-color: rgba(255, 107, 61, .48); }

/* 时间线 */
.timeline { position: relative; padding-left: 26px; }
.timeline::before { content: ""; position: absolute; left: 4px; top: 8px; bottom: 8px; width: 1px; background: var(--line); }
.timeline-item { position: relative; padding-bottom: 26px; }
.timeline-item::before {
  content: ""; position: absolute; left: -26px; top: 9px; width: 9px; height: 9px;
  background: var(--bg); border: 1px solid var(--green);
}
.timeline-date { font-family: var(--font-mono); font-size: 12px; letter-spacing: .08em; color: var(--muted); }

/* 左侧索引 */
.index-rail { position: sticky; top: calc(var(--header-h) + 24px); border-left: 1px solid var(--line); padding-left: 14px; }
.index-link {
  display: block; padding: 6px 0;
  font-family: var(--font-mono); font-size: 12px; letter-spacing: .06em; color: var(--muted);
  transition: color .18s ease, padding-left .18s ease;
}
.index-link:hover { color: var(--ink); }
.index-link[aria-current="true"], .index-link.is-active { color: var(--lime); padding-left: 4px; }

/* 分段切换 */
.segmented { display: inline-flex; gap: 3px; padding: 3px; background: var(--panel); border: 1px solid var(--line); }
.segmented-btn {
  padding: 7px 12px; border: 1px solid transparent; background: transparent; color: var(--muted);
  font-family: var(--font-mono); font-size: 13px; letter-spacing: .04em; cursor: pointer;
  transition: background-color .18s ease, color .18s ease;
}
.segmented-btn:hover { color: var(--ink); }
.segmented-btn[aria-pressed="true"] { background: var(--raise); color: var(--lime); box-shadow: inset 0 0 0 1px var(--line); }

/* 媒体容器 */
.media-frame { position: relative; overflow: hidden; border: 1px solid var(--line); background: var(--panel); }
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame figcaption, .figure-frame figcaption {
  position: absolute; left: 0; right: 0; bottom: 0; z-index: 2;
  padding: 10px 14px; font-family: var(--font-mono); font-size: 12px; color: var(--ink-soft);
  background: linear-gradient(to top, rgba(10, 16, 19, .92), rgba(10, 16, 19, 0));
}
.figure-frame {
  position: relative; overflow: hidden; border: 1px solid var(--line);
  background:
    linear-gradient(140deg, rgba(25, 195, 125, .12), transparent 55%),
    linear-gradient(320deg, rgba(46, 155, 255, .14), transparent 60%),
    var(--panel);
}
.figure-frame::after {
  content: ""; position: absolute; inset: 0; pointer-events: none; opacity: .45;
  background-image:
    linear-gradient(to right, rgba(36, 52, 58, .75) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(36, 52, 58, .75) 1px, transparent 1px);
  background-size: 58px 58px;
}
.ratio-21x9 { aspect-ratio: 21 / 9; }
.ratio-16x9 { aspect-ratio: 16 / 9; }
.ratio-4x3 { aspect-ratio: 4 / 3; }
.ratio-1x1 { aspect-ratio: 1 / 1; }
.ratio-3x4 { aspect-ratio: 3 / 4; }

/* 入场动效 */
[data-reveal] { opacity: 0; transform: translateY(14px); }
[data-reveal].is-visible { opacity: 1; transform: none; transition: opacity .5s ease, transform .5s ease; }

/* ============================================================
   响应式
   ============================================================ */
@media (max-width: 1180px) {
  .site-header .brand-tagline { display: none; }
  .site-header .header-cta--ghost { display: none; }
  .site-header .nav-link { padding: 8px 9px; }
}
@media (max-width: 1023px) {
  .grid-12 { grid-template-columns: repeat(6, minmax(0, 1fr)); }
  .grid-12 > [class*="span-"] { grid-column: 1 / -1; }
  .footer-brand { grid-column: 1 / -1; }
  .footer-cols { grid-column: 1 / -1; }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .index-rail { position: static; border-left: 0; border-top: 1px solid var(--line); padding: 14px 0 0; }
  .site-header .nav-link { font-size: 12.5px; letter-spacing: .04em; padding: 8px 7px; }
}
@media (max-width: 899px) {
  :root { --header-h: 64px; }
  .site-header .header-cta { display: none; }
  .nav-toggle { display: inline-flex; }
  .site-header .site-nav {
    position: fixed; left: 0; right: 0; top: var(--header-h); z-index: 5;
    display: block; flex: none; justify-content: flex-start;
    max-height: calc(100vh - var(--header-h)); overflow-y: auto;
    padding: 10px var(--pad-x) 24px;
    background: var(--panel); border-top: 1px solid var(--line); border-bottom: 1px solid var(--line);
    opacity: 0; visibility: hidden; pointer-events: none; transform: translateY(-10px);
    transition: opacity .2s ease, transform .2s ease, visibility .2s linear;
  }
  .site-header[data-open] .site-nav { opacity: 1; visibility: visible; pointer-events: auto; transform: none; }
  .site-header .nav-list { flex-direction: column; align-items: stretch; gap: 0; counter-reset: navidx; }
  .site-header .nav-item { counter-increment: navidx; border-bottom: 1px solid var(--line); }
  .site-header .nav-link {
    display: flex; align-items: baseline; gap: 12px;
    padding: 14px 0; font-size: 15px; letter-spacing: .02em; border-bottom: 0;
  }
  .site-header .nav-link::before {
    content: counter(navidx, decimal-leading-zero);
    font-family: var(--font-mono); font-size: 11px; color: var(--muted);
  }
  .site-header .nav-link[aria-current="page"] { border-bottom: 0; }
  .nav-actions { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; margin-top: 20px; }
  .footer-contact { grid-template-columns: 1fr; }
  .section-head { gap: 10px; }
}
@media (max-width: 639px) {
  .site-header .season-switch { display: none; }
  .nav-actions { grid-template-columns: 1fr; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-legal { flex-direction: column; align-items: flex-start; }
  .brand--footer .brand-mark { font-size: 23px; }
  .btn { width: auto; }
  .btn-block { width: 100%; }
}

/* ---------- 可访问性降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .card:hover { transform: none; }
}