/* ============================================================
   博万体育赛事 · saidian-bowan.com.cn
   /assets/site.css — 共享外壳、变量、通用组件
   ============================================================ */

/* ---------- 01 Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body, h1, h2, h3, h4, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { list-style: none; padding: 0; }
img, svg, video, canvas { display: block; max-width: 100%; }
a { color: inherit; text-decoration: none; }
button, input, textarea, select { font: inherit; color: inherit; }
button { background: none; border: 0; cursor: pointer; }
::selection { background: var(--cyan); color: #062018; }

/* ---------- 02 变量 ---------- */
:root {
  --ink-900: #0A1424;
  --ink-800: #101F33;
  --ink-700: #17293f;
  --paper: #F4EEDF;
  --paper-hi: #FFF9EF;
  --ink-body: #1A1714;
  --ink-body-soft: #5c554c;
  --cyan: #35F2D0;
  --orange: #FF6A2B;
  --green: #58D68D;
  --steel: #8FA3B8;
  --steel-bright: #c3d2e0;
  --alert: #C8411A;

  --line-dark: rgba(143, 163, 184, 0.28);
  --line-cyan: rgba(53, 242, 208, 0.24);
  --line-paper: rgba(26, 23, 20, 0.16);

  --font-display: "Oswald", "Barlow Condensed", "Noto Sans SC", "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Noto Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, sans-serif;
  --font-mono: "JetBrains Mono", "Roboto Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;

  --radius-panel: 20px 20px 20px 6px;
  --radius-soft: 14px 14px 14px 4px;
  --radius-pill: 999px;

  --shell-max: 1280px;
  --gutter: clamp(16px, 4vw, 40px);
  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
}

/* ---------- 03 中文基础排版 ---------- */
body {
  font-family: var(--font-body);
  font-size: clamp(16px, 0.35vw + 15px, 17px);
  font-weight: 400;
  line-height: 1.7;
  color: var(--paper);
  background-color: var(--ink-900);
  background-image:
    radial-gradient(900px 420px at 82% -8%, rgba(53, 242, 208, 0.10), transparent 62%),
    radial-gradient(720px 380px at 4% 4%, rgba(255, 106, 43, 0.08), transparent 60%);
  background-repeat: no-repeat;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
}
h1, h2, h3, h4 { font-weight: 700; line-height: 1.18; letter-spacing: -0.005em; overflow-wrap: break-word; }
p, li, dd { overflow-wrap: break-word; }
strong { font-weight: 700; color: var(--paper-hi); }
:focus-visible { outline: 2px solid var(--cyan); outline-offset: 3px; border-radius: 3px; }
#main-content { scroll-margin-top: 112px; }

/* ---------- 04 布局容器 ---------- */
.shell {
  width: 100%;
  max-width: var(--shell-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}
.page-main { display: block; padding-block: clamp(24px, 4vw, 56px) clamp(48px, 7vw, 96px); }
.section { padding-block: clamp(26px, 4.4vw, 56px); border-top: 1px solid var(--line-dark); }
.section:first-child { border-top: 0; padding-top: 0; }
.layout-rail {
  display: grid;
  grid-template-columns: minmax(200px, 22%) minmax(0, 1fr);
  gap: clamp(20px, 3.4vw, 52px);
  align-items: start;
}
.grid-2 { display: grid; grid-template-columns: repeat(2, minmax(0, 1fr)); gap: clamp(16px, 2.4vw, 32px); }
.grid-3 { display: grid; grid-template-columns: repeat(3, minmax(0, 1fr)); gap: clamp(16px, 2.4vw, 28px); }

/* ---------- 05 跳转与滚动进度 ---------- */
.skip-link {
  position: fixed;
  top: 10px;
  left: 10px;
  z-index: 200;
  padding: 12px 22px;
  border-radius: var(--radius-pill);
  background: var(--cyan);
  color: #062018;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  transform: translateY(-180%);
  transition: transform 0.2s var(--ease);
}
.skip-link:focus, .skip-link:focus-visible { transform: translateY(0); outline: 3px solid var(--orange); outline-offset: 2px; }

.scroll-progress {
  position: fixed;
  top: 0; left: 0; right: 0;
  height: 3px;
  z-index: 120;
  transform: scaleX(0);
  transform-origin: 0 50%;
  background: linear-gradient(90deg, var(--cyan), var(--orange));
  pointer-events: none;
}

/* ---------- 06 页头 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, #0A1424 0%, #0c1a2c 100%);
  border-bottom: 1px solid var(--line-cyan);
  box-shadow: 0 20px 44px -36px rgba(0, 0, 0, 0.95);
}
.site-header::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(53, 242, 208, 0) 46%, var(--orange) 100%);
  opacity: 0.85;
}
.header-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: clamp(14px, 2.2vw, 32px);
  padding-block: 14px 12px;
}
.brand {
  order: 1;
  margin-right: auto;
  display: inline-flex;
  align-items: center;
  gap: 12px;
  min-height: 44px;
  color: var(--paper-hi);
}
.brand-mark {
  position: relative;
  flex: 0 0 auto;
  width: 40px;
  height: 40px;
  border-radius: 10px 10px 10px 3px;
  background:
    radial-gradient(circle at 50% 50%, transparent 0 7px, rgba(53, 242, 208, 0.55) 7px 8px, transparent 8px),
    linear-gradient(90deg, transparent 49.2%, rgba(53, 242, 208, 0.35) 49.2% 50.8%, transparent 50.8%),
    linear-gradient(160deg, rgba(53, 242, 208, 0.16), rgba(255, 106, 43, 0.24)),
    var(--ink-800);
  box-shadow: inset 0 0 0 1px rgba(244, 238, 223, 0.22);
}
.brand-mark::after {
  content: "";
  position: absolute;
  top: 6px; right: 6px;
  width: 6px; height: 6px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 43, 0.18);
}
.brand-lockup { display: flex; flex-direction: column; gap: 3px; }
.brand-name {
  font-family: var(--font-display);
  font-size: clamp(17px, 1.6vw, 21px);
  font-weight: 700;
  letter-spacing: 0.06em;
  line-height: 1;
  transition: color 0.18s var(--ease);
}
.brand-tag {
  font-family: var(--font-mono);
  font-size: 10.5px;
  line-height: 1;
  letter-spacing: 0.34em;
  color: var(--cyan);
  text-transform: uppercase;
}
.brand:hover .brand-name { color: var(--cyan); }

.primary-nav { order: 2; }
.nav-list { display: flex; flex-wrap: wrap; align-items: center; gap: clamp(10px, 1.6vw, 26px); }
.nav-link {
  position: relative;
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 10px 0;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 500;
  letter-spacing: 0.05em;
  color: var(--steel-bright);
  transition: color 0.18s var(--ease);
}
.nav-index {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0;
  color: var(--cyan);
  opacity: 0.62;
  transition: opacity 0.18s var(--ease), color 0.18s var(--ease);
}
.nav-label { white-space: nowrap; }
.nav-link::after {
  content: "";
  position: absolute;
  left: 0; right: 0; bottom: 2px;
  height: 2px;
  background: var(--cyan);
  transform: scaleX(0);
  transform-origin: left center;
  transition: transform 0.2s var(--ease);
}
.nav-link:hover, .nav-link:focus-visible { color: var(--paper-hi); }
.nav-link:hover::after, .nav-link:focus-visible::after { transform: scaleX(1); }
.nav-link[aria-current="page"] { color: var(--paper-hi); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); }
.nav-link[aria-current="page"] .nav-index { opacity: 1; color: var(--orange); }

.header-actions { order: 3; display: flex; align-items: center; gap: 10px; }
.header-cta { font-size: 14px; padding: 10px 18px; }
.header-scale {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-bottom: 10px;
  overflow: hidden;
}
.scale-tick { flex: 1 1 10px; height: 2px; border-radius: 2px; background: var(--line-dark); }
.scale-tick--hot { flex: 0 0 34px; height: 3px; background: var(--orange); opacity: 0.9; }
.scale-tick--cold { flex: 0 0 18px; background: var(--cyan); opacity: 0.55; }

.nav-toggle {
  display: none;
  align-items: center;
  gap: 9px;
  min-height: 44px;
  padding: 8px 15px;
  border: 1px solid rgba(244, 238, 223, 0.28);
  border-radius: var(--radius-pill);
  color: var(--paper-hi);
  background: rgba(244, 238, 223, 0.05);
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.nav-toggle:hover { border-color: var(--cyan); background: rgba(53, 242, 208, 0.12); }
.nav-toggle[aria-expanded="true"] { border-color: var(--cyan); background: rgba(53, 242, 208, 0.16); }
.nav-toggle-box { display: inline-flex; flex-direction: column; justify-content: center; gap: 3px; width: 16px; }
.nav-toggle-box span { display: block; height: 2px; border-radius: 2px; background: var(--cyan); transition: transform 0.2s var(--ease), opacity 0.2s var(--ease); }
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(1) { transform: translateY(5px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(2) { opacity: 0; }
.nav-toggle[aria-expanded="true"] .nav-toggle-box span:nth-child(3) { transform: translateY(-5px) rotate(-45deg); }
.nav-toggle-text { font-family: var(--font-display); font-size: 13px; letter-spacing: 0.14em; }

/* ---------- 07 页脚 ---------- */
.site-footer {
  background: linear-gradient(180deg, #0d1b2d 0%, var(--ink-900) 100%);
  border-top: 1px solid var(--line-cyan);
  color: var(--steel);
}
.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr 1.45fr;
  gap: clamp(24px, 4vw, 56px);
  padding-block: clamp(38px, 6vw, 72px) clamp(26px, 3.4vw, 40px);
}
.footer-brand { display: flex; flex-direction: column; gap: 8px; }
.footer-brandline {
  font-family: var(--font-display);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: 0.02em;
  color: var(--paper-hi);
}
.footer-motto {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.3em;
  color: var(--cyan);
  text-transform: uppercase;
}
.footer-note { font-size: 14px; line-height: 1.7; color: var(--steel); max-width: 34ch; }
.footer-col { display: flex; flex-direction: column; gap: 14px; }
.footer-col-title {
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.2em;
  color: var(--paper-hi);
  text-transform: uppercase;
  display: flex;
  align-items: center;
  gap: 10px;
}
.footer-col-title::before { content: ""; width: 16px; height: 2px; background: var(--orange); flex: 0 0 auto; }
.footer-links { display: flex; flex-direction: column; gap: 10px; }
.footer-links a {
  display: inline-block;
  font-size: 14.5px;
  color: var(--steel);
  border-bottom: 1px solid transparent;
  padding-block: 2px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer-links a:hover, .footer-links a:focus-visible { color: var(--paper-hi); border-bottom-color: var(--cyan); }
.footer-contact { display: flex; flex-direction: column; gap: 14px; }
.contact-list { display: flex; flex-direction: column; gap: 12px; }
.contact-row { display: grid; gap: 2px; }
.contact-row dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: rgba(143, 163, 184, 0.85);
  text-transform: uppercase;
}
.contact-row dd { font-size: 14.5px; color: var(--paper); word-break: break-word; }
.footer-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 10px;
  padding-block: 16px 26px;
  border-top: 1px dashed var(--line-dark);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--steel);
}
.footer-legal { color: var(--steel); }
.footer-year { display: inline-flex; align-items: center; gap: 6px; }
.footer-year .mono { color: var(--cyan); }

/* ---------- 08 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  min-height: 44px;
  padding: 11px 22px;
  border: 1px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1.2;
  cursor: pointer;
  transition: transform 0.18s var(--ease), background-color 0.18s var(--ease),
              color 0.18s var(--ease), border-color 0.18s var(--ease), box-shadow 0.18s var(--ease);
}
.btn:hover { transform: translateY(-2px); }
.btn:active { transform: translateY(0); }
.btn--signal { background: var(--orange); color: #1a0f08; box-shadow: 0 6px 0 -2px rgba(255, 106, 43, 0.22); }
.btn--signal:hover { background: #ff7d47; box-shadow: 0 10px 0 -4px rgba(255, 106, 43, 0.3); }
.btn--ghost { border-color: var(--line-cyan); color: var(--paper-hi); background: rgba(53, 242, 208, 0.07); }
.btn--ghost:hover { background: rgba(53, 242, 208, 0.16); border-color: var(--cyan); }
.btn--paper { background: var(--ink-body); color: var(--paper-hi); }
.btn--paper:hover { background: #2b2622; }
.btn--line { border-color: var(--line-paper); color: var(--ink-body); background: transparent; }
.btn--line:hover { border-color: var(--ink-body); background: rgba(26, 23, 20, 0.06); }

/* ---------- 09 面板与卡片 ---------- */
.paper-panel {
  background: var(--paper);
  color: var(--ink-body);
  border-radius: var(--radius-panel);
  padding: clamp(20px, 3vw, 36px);
  box-shadow: 0 30px 70px -46px rgba(0, 0, 0, 0.95);
}
.card {
  background: var(--paper-hi);
  color: var(--ink-body);
  border: 1px solid var(--line-paper);
  border-radius: var(--radius-soft);
  padding: clamp(16px, 2.2vw, 24px);
  transition: transform 0.2s var(--ease), box-shadow 0.2s var(--ease), border-color 0.2s var(--ease);
}
.card:hover, .card:focus-within {
  transform: translateY(-3px);
  border-color: rgba(26, 23, 20, 0.3);
  box-shadow: 0 24px 44px -32px rgba(0, 0, 0, 0.9);
}
.card-title {
  font-family: var(--font-display);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--ink-body);
}
.slice {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
  gap: clamp(18px, 3vw, 40px);
  align-items: center;
  padding: clamp(20px, 3vw, 34px);
  background: linear-gradient(120deg, rgba(23, 41, 63, 0.96), rgba(16, 31, 51, 0.96));
  border: 1px solid var(--line-cyan);
  border-radius: var(--radius-panel);
}
.rule { border: 0; height: 1px; background: var(--line-dark); margin-block: clamp(20px, 3vw, 32px); }

/* ---------- 10 文字与数据 ---------- */
.kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.26em;
  text-transform: uppercase;
  color: var(--cyan);
}
.kicker::before { content: ""; width: 26px; height: 2px; background: var(--orange); flex: 0 0 auto; }
.display {
  font-family: var(--font-display);
  font-size: clamp(34px, 5.6vw, 72px);
  font-weight: 700;
  line-height: 1.02;
  letter-spacing: -0.015em;
  color: var(--paper-hi);
}
.lede { font-size: clamp(16px, 1.5vw, 19px); line-height: 1.75; color: #d8e1ea; }
.muted { color: var(--steel); }
.mono { font-family: var(--font-mono); font-variant-numeric: tabular-nums; letter-spacing: 0.02em; }
.num { font-family: var(--font-mono); font-variant-numeric: tabular-nums; font-weight: 600; letter-spacing: 0.01em; }
.paper-panel .kicker, .card .kicker { color: var(--alert); }
.paper-panel .kicker::before, .card .kicker::before { background: var(--ink-body); }
.paper-panel .muted, .card .muted { color: var(--ink-body-soft); }
.paper-panel .lede, .card .lede { color: #2c2721; }
.paper-panel :focus-visible, .card :focus-visible { outline-color: var(--alert); }

.stat { display: flex; flex-direction: column; gap: 2px; }
.stat-value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 600;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.1;
  color: var(--paper-hi);
}
.stat-label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--steel);
}
.paper-panel .stat-value, .card .stat-value { color: var(--ink-body); }
.paper-panel .stat-label, .card .stat-label { color: var(--ink-body-soft); }
.delta { display: inline-flex; align-items: center; gap: 6px; font-family: var(--font-mono); font-size: 13px; font-weight: 600; }
.delta--up { color: var(--green); }
.delta--down { color: var(--alert); }

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 11px;
  border: 1px solid currentColor;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  line-height: 1.6;
}
.tag--cyan { color: var(--cyan); }
.tag--orange { color: var(--orange); }
.tag--green { color: var(--green); }
.paper-panel .tag--cyan, .card .tag--cyan { color: #0f6f61; }
.paper-panel .tag--orange, .card .tag--orange { color: var(--alert); }
.paper-panel .tag--green, .card .tag--green { color: #1f7a4a; }
.status-dot {
  width: 8px; height: 8px;
  border-radius: 50%;
  background: var(--orange);
  flex: 0 0 auto;
  animation: statusPulse 2.4s var(--ease) infinite;
}
@keyframes statusPulse {
  0%, 100% { box-shadow: 0 0 0 0 rgba(255, 106, 43, 0.55); }
  50% { box-shadow: 0 0 0 5px rgba(255, 106, 43, 0); }
}

/* ---------- 11 面包屑 ---------- */
.crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--steel);
}
.crumbs li { display: inline-flex; align-items: center; gap: 8px; }
.crumbs li + li::before { content: "/"; color: var(--line-dark); }
.crumbs a { color: var(--steel); border-bottom: 1px solid transparent; transition: color 0.18s var(--ease), border-color 0.18s var(--ease); }
.crumbs a:hover, .crumbs a:focus-visible { color: var(--cyan); border-bottom-color: var(--cyan); }
.crumbs [aria-current="page"] { color: var(--paper-hi); }

/* ---------- 12 图片占位容器 ---------- */
.media-frame {
  position: relative;
  overflow: hidden;
  aspect-ratio: 16 / 9;
  border-radius: var(--radius-soft);
  background-color: var(--ink-800);
  background-image:
    repeating-linear-gradient(90deg, rgba(53, 242, 208, 0.14) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, rgba(143, 163, 184, 0.12) 0 1px, transparent 1px 44px),
    linear-gradient(150deg, rgba(53, 242, 208, 0.12), rgba(255, 106, 43, 0.12));
  box-shadow: inset 0 0 0 1px var(--line-cyan);
}
.media-frame img { width: 100%; height: 100%; object-fit: cover; }
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--square { aspect-ratio: 1 / 1; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-cap {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--steel);
}
.paper-panel .media-cap, .card .media-cap { color: var(--ink-body-soft); }

/* ---------- 13 索引轨道 ---------- */
.rail { position: sticky; top: clamp(96px, 12vh, 132px); }
.rail-title {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--steel);
  margin-bottom: 12px;
}
.rail-list { display: flex; flex-direction: column; gap: 2px; border-left: 1px solid var(--line-dark); }
.rail-link {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 10px;
  padding: 10px 12px 10px 15px;
  margin-left: -1px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--steel);
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.rail-link:hover, .rail-link:focus-visible { color: var(--paper-hi); background: rgba(53, 242, 208, 0.07); }
.rail-link[aria-current="true"] {
  color: var(--paper-hi);
  border-left-color: var(--cyan);
  background: linear-gradient(90deg, rgba(53, 242, 208, 0.16), rgba(53, 242, 208, 0));
}

/* ---------- 14 前端过滤 ---------- */
.filter-bar { display: flex; flex-wrap: wrap; align-items: center; gap: 12px; }
.filter-input {
  width: min(320px, 100%);
  min-height: 44px;
  padding: 10px 18px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-pill);
  background: rgba(244, 238, 223, 0.06);
  color: var(--paper-hi);
  font-family: var(--font-body);
  font-size: 15px;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.filter-input::placeholder { color: rgba(143, 163, 184, 0.9); }
.filter-input:focus { border-color: var(--cyan); background: rgba(53, 242, 208, 0.08); }
.filter-status { font-family: var(--font-mono); font-size: 12px; letter-spacing: 0.04em; color: var(--steel); }
.paper-panel .filter-input, .card .filter-input { background: var(--paper-hi); color: var(--ink-body); border-color: var(--line-paper); }
.paper-panel .filter-input:focus, .card .filter-input:focus { border-color: var(--ink-body); }
.paper-panel .filter-status, .card .filter-status { color: var(--ink-body-soft); }
[data-filter-item][hidden] { display: none !important; }

/* ---------- 15 辅助 ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 16 响应式 ---------- */
@media (max-width: 1100px) {
  .nav-list { gap: 14px; }
  .nav-link { font-size: 14px; }
  .nav-index { display: none; }
  .footer-grid { grid-template-columns: 1.4fr 1fr 1fr; }
  .footer-contact { grid-column: 1 / -1; }
}
@media (max-width: 900px) {
  .header-inner { padding-block: 12px; gap: 12px; }
  .nav-toggle { display: inline-flex; }
  .header-cta { padding: 9px 15px; font-size: 13px; }
  .primary-nav {
    order: 4;
    flex: 1 1 100%;
    display: none;
    margin-top: 2px;
    padding: 6px;
    background: var(--paper);
    border-radius: var(--radius-soft);
    box-shadow: 0 28px 44px -30px rgba(0, 0, 0, 0.9);
  }
  .primary-nav[data-open] { display: block; }
  .nav-list { flex-direction: column; align-items: stretch; gap: 0; }
  .nav-item + .nav-item { border-top: 1px solid var(--line-paper); }
  .nav-link {
    width: 100%;
    min-height: 48px;
    align-items: center;
    justify-content: flex-start;
    padding: 14px 12px;
    font-size: 16px;
    color: var(--ink-body);
  }
  .nav-index { display: inline; font-size: 11px; color: var(--alert); opacity: 0.85; }
  .nav-link::after { left: 12px; right: auto; bottom: 9px; width: 20px; height: 2px; background: var(--alert); }
  .nav-link[aria-current="page"] { color: var(--alert); background: rgba(26, 23, 20, 0.06); }
  .nav-link[aria-current="page"] .nav-index { color: var(--alert); opacity: 1; }

  .layout-rail { grid-template-columns: minmax(0, 1fr); gap: clamp(18px, 3vw, 28px); }
  .rail { position: static; }
  .rail-list { flex-direction: row; gap: 8px; overflow-x: auto; border-left: 0; padding-bottom: 6px; scrollbar-width: thin; }
  .rail-link {
    margin-left: 0;
    padding: 8px 14px;
    white-space: nowrap;
    border: 1px solid var(--line-dark);
    border-radius: var(--radius-pill);
  }
  .rail-link[aria-current="true"] { border-color: var(--cyan); background: rgba(53, 242, 208, 0.14); }
  .grid-2, .grid-3 { grid-template-columns: minmax(0, 1fr); }
  .slice { grid-template-columns: minmax(0, 1fr); }
}
@media (max-width: 780px) {
  .footer-grid { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-brand { grid-column: 1 / -1; }
  .footer-contact { grid-column: 1 / -1; }
  .footer-note { max-width: none; }
}
@media (max-width: 640px) {
  .header-scale { display: none; }
  .footer-bar { flex-direction: column; align-items: flex-start; gap: 6px; }
  .footer-grid { grid-template-columns: minmax(0, 1fr); }
  .display { font-size: clamp(32px, 9vw, 44px); }
  .filter-input { width: 100%; }
}
@media (max-width: 400px) {
  .brand-mark { width: 34px; height: 34px; }
  .brand-tag { letter-spacing: 0.22em; font-size: 10px; }
  .header-cta { padding: 9px 12px; font-size: 12.5px; }
}

/* ---------- 17 减少动态 ---------- */
@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;
    scroll-behavior: auto !important;
  }
  .btn:hover, .card:hover, .card:focus-within { transform: none; }
  .status-dot { animation: none; box-shadow: 0 0 0 3px rgba(255, 106, 43, 0.18); }
}