/* =========================================================================
   球速赛事 · 共享样式 /assets/site.css
   夜场墨绿底 · 荧光青绿强调 · 切角面板 · 取景框导航
   ========================================================================= */

/* ---------- 1. 设计变量 ---------- */
:root {
  --pitch: #0B1F1A;
  --stand: #10161A;
  --panel: #14261F;
  --panel-hi: #182D25;
  --neon: #3DFFA0;
  --neon-ink: #0E7B54;
  --track: #FF7A2F;
  --score: #FF3B47;
  --bone: #F2F5F3;
  --silver: #93A39C;
  --line: #24403A;
  --amber: #FFC24B;

  --font-display: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-editorial: "Source Han Serif SC", "Noto Serif SC", "Songti SC", Georgia, serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --gutter: 24px;
  --maxw: 1360px;
  --pad: 28px;
  --ease: cubic-bezier(.22, .61, .36, 1);
  --t-fast: 150ms;
  --t-panel: 260ms;
  --t-band: 420ms;
}

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

html {
  -webkit-text-size-adjust: 100%;
  scroll-padding-top: 132px;
}

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

body,
h1, h2, h3, h4, h5, h6,
p, ul, ol, li, figure, blockquote, dl, dd { margin: 0; padding: 0; }

ul, ol { 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; }

main { display: block; }

#main-content { display: block; }

/* ---------- 3. 页面基调与中文排版 ---------- */
body {
  min-height: 100vh;
  background-color: var(--pitch);
  color: var(--bone);
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.75;
  letter-spacing: .01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

body::before {
  content: "";
  position: fixed;
  inset: 0;
  border: 1px solid var(--line);
  pointer-events: none;
  z-index: 95;
}

h1, h2, h3, h4 {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.14;
}

.display {
  font-family: var(--font-display);
  font-weight: 900;
  letter-spacing: -.02em;
  line-height: 1.08;
  font-size: clamp(2rem, 5.4vw, 4rem);
}

.eyebrow {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--silver);
}

.mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: .01em;
}

.prose {
  max-width: 68ch;
  line-height: 1.85;
}

.prose p + p { margin-top: 1em; }

.prose h2 {
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(1.375rem, 2.4vw, 1.875rem);
  letter-spacing: 0;
  margin-top: 2em;
  margin-bottom: .6em;
}

.prose ul { margin: 1em 0 0 1.1em; }
.prose li { list-style: none; position: relative; padding-left: 18px; }
.prose li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .78em;
  width: 8px;
  height: 1px;
  background: var(--neon);
}

/* ---------- 4. 焦点与跳转链接 ---------- */
:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 2px;
}

.skip-link {
  position: fixed;
  top: -80px;
  left: 16px;
  z-index: 200;
  padding: 12px 20px;
  background: var(--neon);
  color: #06201A;
  font-weight: 800;
  font-size: 15px;
  transition: top var(--t-fast) var(--ease);
}

.skip-link:focus { top: 16px; }

/* ---------- 5. 布局容器与网格 ---------- */
.container {
  width: 100%;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
}

.section { padding: 72px 0; }
.section--tight { padding: 40px 0; }

.section--bone {
  background: var(--bone);
  color: var(--stand);
}

.section--bone .section-title,
.section--bone h2,
.section--bone h3 { color: var(--stand); }

.section--bone .section-num { color: var(--neon-ink); }
.section--bone .section-lead { color: #4C5C56; }
.section--bone .divider,
.section--bone .tick-rule { border-color: #D3DCD8; }

.grid {
  display: grid;
  gap: var(--gutter);
}

.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)); }

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

.tick-rule {
  height: 12px;
  border-bottom: 1px solid var(--line);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 16px);
  background-position: bottom left;
  background-repeat: repeat-x;
  background-size: 16px 6px;
}

/* ---------- 6. 章节牌 ---------- */
.section-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px 20px;
  padding-bottom: 16px;
  margin-bottom: 28px;
  border-bottom: 1px solid var(--line);
}

.section-num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--neon);
}

.section-title {
  font-family: var(--font-editorial);
  font-weight: 600;
  font-size: clamp(1.375rem, 2.6vw, 1.875rem);
  letter-spacing: 0;
  line-height: 1.3;
}

.section-lead {
  margin-left: auto;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--silver);
}

/* ---------- 7. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 12px 22px;
  font-size: 15px;
  font-weight: 800;
  line-height: 1.2;
  white-space: nowrap;
  border: 1px solid var(--line);
  background: var(--panel);
  color: var(--bone);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: background-color var(--t-fast) var(--ease),
              color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
}

.btn:hover { background: var(--panel-hi); border-color: var(--neon); }

.btn--neon {
  background: var(--neon);
  border-color: var(--neon);
  color: #06201A;
}
.btn--neon:hover { background: #6BFFB8; border-color: #6BFFB8; color: #06201A; }

.btn--track {
  background: var(--track);
  border-color: var(--track);
  color: #241005;
}
.btn--track:hover { background: #FF9354; border-color: #FF9354; color: #241005; }

.btn--ghost {
  background: transparent;
  border-color: var(--line);
  color: var(--bone);
}
.btn--ghost:hover { background: var(--panel); border-color: var(--neon); }

.btn--sm { padding: 9px 16px; font-size: 14px; }

/* ---------- 8. 面板 / 卡片 / 标签 / 数字 ---------- */
.panel {
  position: relative;
  padding: 26px;
  background: var(--line);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 14px, 100% 100%, 0 100%);
  transition: background-color var(--t-fast) var(--ease);
}

.panel::before {
  content: "";
  position: absolute;
  inset: 1px;
  background: var(--panel);
  clip-path: polygon(0 0, calc(100% - 13px) 0, 100% 13px, 100% 100%, 0 100%);
}

.panel > * { position: relative; }

.panel:hover { background: var(--neon); }

.panel--bone { color: var(--stand); }
.panel--bone::before { background: var(--bone); }
.panel--bone .card-text,
.panel--bone .section-lead { color: #4C5C56; }

.panel-index {
  position: absolute;
  top: 16px;
  left: 20px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--silver);
  transition: color var(--t-fast) var(--ease);
}

.panel:hover .panel-index { color: var(--neon); }
.panel--bone:hover .panel-index { color: var(--neon-ink); }

.card {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px;
  background: var(--panel);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - 12px) 0, 100% 12px, 100% 100%, 0 100%);
  transition: background-color var(--t-fast) var(--ease),
              border-color var(--t-fast) var(--ease);
}

.card:hover { background: var(--panel-hi); border-color: var(--neon); }

.card-title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 19px;
  line-height: 1.32;
  letter-spacing: -.01em;
  color: var(--bone);
}

.card-text {
  font-size: 15px;
  line-height: 1.75;
  color: var(--silver);
}

.card-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver);
}

.card-link {
  margin-top: auto;
  padding-top: 6px;
  font-size: 14px;
  font-weight: 800;
  color: var(--neon);
}
.card-link:hover { color: var(--bone); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  border: 1px solid var(--line);
  color: var(--silver);
}

.tag--live { color: var(--amber); border-color: rgba(255, 194, 75, .45); }
.tag--score { color: var(--score); border-color: rgba(255, 59, 71, .45); }

.stat-row {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(128px, 1fr));
  gap: 18px;
}

.stat { display: flex; flex-direction: column; gap: 4px; }

.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--neon);
}

.stat-label {
  font-size: 13px;
  color: var(--silver);
}

/* ---------- 9. 高密度索引列表 ---------- */
.index-list {
  display: grid;
  border-top: 1px solid var(--line);
}

.index-item {
  display: grid;
  grid-template-columns: 72px minmax(0, 1fr) auto;
  align-items: center;
  gap: 16px;
  padding: 14px 4px;
  line-height: 1.4;
  border-bottom: 1px solid var(--line);
  transition: background-color var(--t-fast) var(--ease);
}

.index-item:hover { background: rgba(61, 255, 160, .05); }

.index-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--silver);
}

.index-main {
  font-size: 16px;
  font-weight: 700;
  color: var(--bone);
}

.index-meta {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--silver);
  text-align: right;
}

/* ---------- 10. 分段切换（标签页） ---------- */
.tabs { width: 100%; }

.tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.tab {
  appearance: none;
  padding: 9px 16px;
  font-size: 15px;
  font-weight: 800;
  color: var(--silver);
  background: transparent;
  border: 1px solid transparent;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
  transition: color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}

.tab:hover { color: var(--bone); background: var(--panel); }

.tab[aria-selected="true"] {
  color: #06201A;
  background: var(--neon);
}

.tabpanel { padding-top: 26px; }
.tabpanel[hidden] { display: none; }

/* ---------- 11. 图片容器 ---------- */
.media {
  position: relative;
  overflow: hidden;
  background: var(--stand);
  border: 1px solid var(--line);
}

.media > img,
.media > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.media--3x1 { aspect-ratio: 3 / 1; }
.media--4x3 { aspect-ratio: 4 / 3; }
.media--16x9 { aspect-ratio: 16 / 9; }
.media--4x5 { aspect-ratio: 4 / 5; }

.media__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 8px 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  background: rgba(11, 31, 26, .84);
  color: var(--bone);
}

.media__placeholder {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  background: linear-gradient(140deg, #14261F 0%, #0B1F1A 58%, #10161A 100%);
  color: var(--silver);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
}

/* ---------- 12. 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver);
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb li + li::before { content: "/"; color: var(--line); }
.breadcrumb a:hover { color: var(--neon); }
.breadcrumb [aria-current="page"] { color: var(--bone); }

/* ---------- 13. 页头：取景框导航 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 70;
  background: var(--stand);
  border-bottom: 1px solid var(--line);
}

.header-rail {
  position: fixed;
  left: 0;
  top: 0;
  bottom: 0;
  width: 20px;
  display: none;
  flex-direction: column;
  align-items: center;
  gap: 10px;
  padding: 180px 0 90px;
  border-right: 1px solid rgba(36, 64, 58, .55);
  pointer-events: none;
  z-index: 60;
}

.rail-tick {
  width: 9px;
  height: 1px;
  background: var(--line);
}

.rail-tick--on {
  width: 14px;
  background: var(--neon);
}

.rail-label {
  margin-top: auto;
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .3em;
  color: var(--silver);
}

.header-frame {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  column-gap: 28px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 14px var(--pad) 0;
}

.header-bar {
  grid-column: 1;
  display: flex;
  align-items: center;
  gap: 14px;
  min-width: 0;
}

.brand {
  display: inline-flex;
  align-items: baseline;
  gap: 12px;
  padding: 4px 0;
}

.brand-mark {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 21px;
  letter-spacing: -.02em;
  color: var(--bone);
}

.brand-tag {
  padding-left: 12px;
  border-left: 1px solid var(--line);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--silver);
  white-space: nowrap;
}

.site-nav {
  grid-column: 2;
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: 22px;
  min-width: 0;
}

.nav-list {
  display: flex;
  align-items: center;
  gap: 2px;
  counter-reset: navidx;
}

.nav-item { counter-increment: navidx; }

.nav-link {
  display: inline-flex;
  align-items: center;
  padding: 10px 13px;
  font-size: 15px;
  font-weight: 700;
  color: var(--silver);
  border: 1px solid transparent;
  clip-path: polygon(0 0, calc(100% - 9px) 0, 100% 9px, 100% 100%, 0 100%);
  transition: color var(--t-fast) var(--ease),
              background-color var(--t-fast) var(--ease);
}

.nav-link::before {
  content: counter(navidx, decimal-leading-zero);
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: .06em;
  opacity: .6;
}

.nav-link:hover {
  color: var(--bone);
  background: var(--panel);
}

.nav-link[aria-current="page"] {
  color: #06201A;
  background: var(--neon);
}

.nav-link[aria-current="page"]::before { opacity: .8; }

.nav-extra {
  display: flex;
  align-items: center;
  gap: 18px;
}

.utility-nav {
  display: flex;
  align-items: center;
  gap: 16px;
}

.utility-link {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--silver);
  padding: 4px 0;
  border-bottom: 1px solid transparent;
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.utility-link:hover {
  color: var(--neon);
  border-bottom-color: var(--neon);
}

.nav-toggle {
  grid-column: 3;
  display: none;
  align-items: center;
  gap: 10px;
  padding: 9px 14px;
  background: transparent;
  border: 1px solid var(--line);
  color: var(--bone);
  font-size: 14px;
  font-weight: 800;
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 10px) 0, 100% 10px, 100% 100%, 0 100%);
}

.nav-toggle:hover { border-color: var(--neon); color: var(--neon); }

.nav-toggle-icon {
  position: relative;
  display: inline-block;
  width: 16px;
  height: 12px;
}

.nav-toggle-bar {
  position: absolute;
  left: 0;
  right: 0;
  height: 2px;
  background: currentColor;
  transition: transform var(--t-fast) var(--ease);
}

.nav-toggle-bar:first-child { top: 2px; }
.nav-toggle-bar:last-child { bottom: 2px; }

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child {
  transform: translateY(3px) rotate(45deg);
}

.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child {
  transform: translateY(-3px) rotate(-45deg);
}

.status-strip {
  grid-column: 1 / -1;
  display: flex;
  align-items: center;
  gap: 10px;
  margin-top: 14px;
  padding: 9px 0 11px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  color: var(--silver);
}

.status-text {
  font-size: 13px;
  line-height: 1.5;
  color: var(--silver);
}

.status-dot {
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--neon);
  box-shadow: 0 0 0 3px rgba(61, 255, 160, .16);
  animation: pulse 2.4s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 1; }
  50% { opacity: .4; }
}

.status-code {
  margin-left: auto;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--amber);
  border: 1px solid rgba(255, 194, 75, .42);
}

/* ---------- 14. 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: 88px;
  background: var(--stand);
  border-top: 1px solid var(--line);
}

.footer-ticks {
  height: 16px;
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 0 var(--pad);
  background-image: repeating-linear-gradient(90deg, var(--line) 0 1px, transparent 1px 24px);
  background-position: bottom left;
  background-repeat: repeat-x;
  background-size: 24px 8px;
}

.footer-frame {
  max-width: var(--maxw);
  margin: 0 auto;
  padding: 46px var(--pad) 34px;
}

.footer-top {
  display: grid;
  grid-template-columns: minmax(260px, 1.15fr) 2fr;
  gap: 44px;
}

.footer-brand-line {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 20px;
  letter-spacing: -.01em;
  line-height: 1.4;
  color: var(--bone);
}

.footer-note {
  margin-top: 12px;
  max-width: 40ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 26px;
}

.footer-col-title {
  margin-bottom: 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--neon);
}

.footer-list li + li { margin-top: 9px; }

.footer-link {
  font-size: 15px;
  color: var(--silver);
  transition: color var(--t-fast) var(--ease);
}

.footer-link:hover { color: var(--bone); }

.footer-contact {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
  margin-top: 42px;
  padding-top: 26px;
  border-top: 1px solid var(--line);
}

.contact-item { display: flex; flex-direction: column; gap: 8px; align-items: flex-start; }

.contact-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--silver);
}

.contact-value {
  font-family: var(--font-mono);
  font-size: 15px;
  line-height: 1.6;
  color: var(--bone);
  word-break: break-all;
}

.contact-value--text {
  font-family: var(--font-body);
  font-size: 14px;
  line-height: 1.8;
  color: var(--silver);
}

.copy-btn {
  padding: 6px 12px;
  font-size: 12px;
  font-weight: 700;
  color: var(--silver);
  background: transparent;
  border: 1px solid var(--line);
  cursor: pointer;
  clip-path: polygon(0 0, calc(100% - 8px) 0, 100% 8px, 100% 100%, 0 100%);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.copy-btn:hover { color: var(--bone); border-color: var(--neon); }
.copy-btn[data-copied="true"] { color: var(--neon); border-color: var(--neon); }
.copy-btn[data-copied="false"] { color: var(--score); border-color: var(--score); }

.footer-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 22px;
  margin-top: 34px;
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.meta-line {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--silver);
}

/* ---------- 15. 进度线与进入动效 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  background: var(--neon);
  transform: scaleX(0);
  transform-origin: 0 50%;
  pointer-events: none;
  z-index: 120;
  transition: transform 120ms linear;
}

.js [data-reveal] {
  opacity: 0;
  transform: translateY(8px);
}

.js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
  transition: opacity var(--t-panel) var(--ease), transform var(--t-panel) var(--ease);
}

/* ---------- 16. 响应式 ---------- */
@media (min-width: 1200px) {
  .header-rail { display: flex; }
}

@media (max-width: 1180px) {
  .nav-link { padding: 10px 10px; font-size: 14px; }
  .utility-nav { gap: 12px; }
}

@media (max-width: 1024px) {
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-top { grid-template-columns: 1fr; gap: 34px; }
}

@media (max-width: 900px) {
  :root { --pad: 18px; }

  html { scroll-padding-top: 150px; }

  body { font-size: 16px; }

  .header-frame {
    grid-template-columns: 1fr auto;
    column-gap: 14px;
    row-gap: 10px;
    padding-top: 12px;
  }

  .header-bar { grid-column: 1; }

  .nav-toggle {
    display: inline-flex;
    justify-self: end;
  }

  .site-nav {
    grid-column: 1 / -1;
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    min-width: 0;
  }

  .nav-list {
    gap: 6px;
    overflow-x: auto;
    padding-bottom: 8px;
    scrollbar-width: none;
  }

  .nav-list::-webkit-scrollbar { display: none; }

  .nav-link {
    white-space: nowrap;
    padding: 8px 12px;
    border-color: var(--line);
  }

  .nav-extra { display: none; }

  .site-nav[data-open] .nav-extra {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    padding: 14px 0 4px;
    border-top: 1px solid var(--line);
  }

  .site-nav[data-open] .utility-nav {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .status-strip { margin-top: 12px; }

  .section { padding: 52px 0; }

  .section-head { margin-bottom: 22px; }

  .section-lead {
    margin-left: 0;
    max-width: none;
  }

  .panel { padding: 20px; }
  .panel-index { top: 12px; left: 14px; }

  .index-item { grid-template-columns: 52px minmax(0, 1fr); row-gap: 4px; }
  .index-meta { grid-column: 2; text-align: left; }

  .footer-nav { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-contact { grid-template-columns: repeat(2, minmax(0, 1fr)); gap: 20px; }
}

@media (max-width: 640px) {
  .grid--2,
  .grid--3,
  .grid--4 { grid-template-columns: 1fr; }

  .brand-tag { display: none; }

  .footer-nav { grid-template-columns: 1fr; gap: 22px; }
  .footer-contact { grid-template-columns: 1fr; }

  .tablist { gap: 6px; }
  .tab { padding: 8px 12px; font-size: 14px; }

  .status-text { font-size: 12px; }
  .status-code { display: none; }

  .site-footer { margin-top: 60px; }
  .footer-frame { padding: 34px var(--pad) 28px; }
}

/* ---------- 17. 减少动态效果 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: .001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .001ms !important;
    scroll-behavior: auto !important;
  }

  .js [data-reveal] {
    opacity: 1;
    transform: none;
  }

  .scroll-progress { transition: none; }
}