/* ==========================================================================
   博万体育赛事 — 共享站点样式 /assets/site.css
   夜场计分板 × 展览画册：深蓝基底、荧光橙状态、粗边框与斜切动势
   ========================================================================== */

/* ---------- 1. 变量 ---------- */
:root {
  --ink: #061625;
  --ink-2: #0b253d;
  --ink-3: #123b5e;
  --orange: #ff6b1a;
  --orange-deep: #a83e0b;
  --green: #69d36f;
  --silver: #c7d2de;
  --ice: #f3f7fb;
  --fog: #7e98b2;
  --paper: #e8eef5;

  --font-display: "Noto Serif SC", "Source Han Serif SC", "Songti SC", "STSong", "SimSun", serif;
  --font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Hiragino Sans GB", "Microsoft YaHei", system-ui, -apple-system, sans-serif;
  --font-mono: "JetBrains Mono", "IBM Plex Mono", ui-monospace, "SFMono-Regular", Menlo, Consolas, monospace;

  --page-max: 1200px;
  --gutter: clamp(1rem, 4vw, 3rem);
  --hdr-pad: clamp(0.6rem, 1.3vw, 1.05rem);
  --radius-pill: 999px;
  --radius-card: 4px;
  --shadow-brut: 0 20px 44px -22px rgba(0, 0, 0, 0.9);
  --ease: cubic-bezier(0.22, 0.61, 0.36, 1);
  --reveal-delay: 0ms;
}

/* ---------- 2. Reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  min-height: 100vh;
  background-color: var(--ink);
  background-image:
    radial-gradient(112% 70% at 88% -10%, rgba(18, 59, 94, 0.62), transparent 58%),
    repeating-linear-gradient(112deg, rgba(199, 210, 222, 0.028) 0 1px, transparent 1px 104px);
  color: var(--ice);
  font-family: var(--font-sans);
  font-size: clamp(1rem, 0.96rem + 0.18vw, 1.0625rem);
  line-height: 1.75;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  overflow-x: hidden;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; list-style: none; }
img, svg, picture, video { display: block; max-width: 100%; }
a { color: inherit; }
button { font: inherit; color: inherit; background: none; border: 0; }
hr { border: 0; }

::selection { background: var(--orange); color: var(--ink); }

/* ---------- 3. 中文排版与工具类 ---------- */
.sr-only {
  position: absolute;
  width: 1px; height: 1px;
  padding: 0; margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  clip-path: inset(50%);
  white-space: nowrap;
  border: 0;
}

.skip-link {
  position: fixed;
  top: 0.4rem;
  left: 50%;
  z-index: 999;
  transform: translate(-50%, -180%);
  padding: 0.65rem 1.3rem;
  border-radius: var(--radius-pill);
  background: var(--orange);
  color: var(--ink);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 8px 22px -10px rgba(0, 0, 0, 0.9);
  transition: transform 0.22s var(--ease);
}
.skip-link:focus { transform: translate(-50%, 0); }
.skip-link:focus-visible { outline: 2px solid var(--ice); outline-offset: 3px; }

#main-content {
  display: block;
  padding-top: clamp(5.5rem, 8vw, 7rem);
  scroll-margin-top: 96px;
}

.container {
  width: min(var(--page-max), 100%);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

.section { padding-block: clamp(3rem, 7vw, 6rem); }
.section--tight { padding-block: clamp(2rem, 4vw, 3rem); }

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}
.eyebrow::before {
  content: "";
  width: 22px;
  height: 2px;
  background: var(--orange);
}

.display {
  font-family: var(--font-display);
  font-weight: 900;
  line-height: 1.02;
  letter-spacing: -0.01em;
  font-size: clamp(2.6rem, 7.4vw, 5.6rem);
}
.display--skew { transform: skewX(-5deg); transform-origin: left bottom; }

.chapter__index {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2.6rem, 7vw, 5.5rem);
  font-weight: 700;
  line-height: 0.82;
  color: transparent;
  -webkit-text-stroke: 1px rgba(199, 210, 222, 0.42);
  letter-spacing: -0.02em;
}

.rule {
  height: 2px;
  border: 0;
  background: linear-gradient(90deg, rgba(199, 210, 222, 0.55), rgba(199, 210, 222, 0));
}

.slash-divider {
  height: clamp(28px, 4vw, 54px);
  background: linear-gradient(101deg, transparent 0 46%, rgba(199, 210, 222, 0.14) 46% 48%, transparent 48%);
}

/* ---------- 4. 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.45rem;
  padding: 0.72rem 1.3rem;
  border: 2px solid transparent;
  border-radius: var(--radius-pill);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  line-height: 1.2;
  text-decoration: none;
  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--primary {
  background: var(--orange);
  color: var(--ink);
  box-shadow: 4px 4px 0 0 var(--orange-deep);
}
.btn--primary:hover {
  background: #ff8342;
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 0 var(--orange-deep);
}
.btn--primary:active {
  transform: translate(2px, 2px);
  box-shadow: 1px 1px 0 0 var(--orange-deep);
}

.btn--ghost {
  background: transparent;
  color: var(--ice);
  border-color: rgba(199, 210, 222, 0.34);
}
.btn--ghost:hover {
  border-color: var(--orange);
  color: var(--orange);
}

.btn--sm { padding: 0.55rem 1.05rem; font-size: 0.8125rem; }
.btn--block { width: 100%; }

.btn:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}
.btn--primary:focus-visible {
  outline-color: var(--ice);
  outline-offset: 3px;
}

/* ---------- 5. 页头：三座悬浮浮岛 ---------- */
.arena-header {
  position: fixed;
  inset: 0 0 auto 0;
  z-index: 120;
  display: flex;
  justify-content: center;
  padding: var(--hdr-pad) var(--gutter);
  pointer-events: none;
  transition: padding 0.28s var(--ease);
}
.arena-header[data-scrolled] { --hdr-pad: 0.35rem; }

.arena-header__inner {
  pointer-events: auto;
  width: min(var(--page-max), 100%);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: clamp(0.5rem, 1.6vw, 1.25rem);
}

/* 品牌浮岛 */
.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.7rem;
  padding: 0.5rem 1rem 0.5rem 0.55rem;
  border: 1px solid rgba(199, 210, 222, 0.18);
  border-radius: var(--radius-pill);
  background: rgba(11, 37, 61, 0.86);
  color: var(--ice);
  text-decoration: none;
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}
.brand:hover { border-color: rgba(255, 107, 26, 0.65); background: rgba(18, 59, 94, 0.94); }
.brand:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }

.brand__mark {
  position: relative;
  flex: 0 0 auto;
  display: grid;
  place-content: center;
  gap: 4px;
  width: 32px;
  height: 32px;
  border-radius: 3px;
  background: var(--orange);
  transform: skewX(-8deg);
  box-shadow: 3px 3px 0 0 var(--orange-deep);
  transition: width 0.28s var(--ease), height 0.28s var(--ease);
}
.brand__mark-line {
  display: block;
  width: 16px;
  height: 3px;
  border-radius: 2px;
  background: var(--ink);
}
.brand__mark-line:nth-child(2) { width: 10px; margin-left: -6px; }

.brand__text { display: grid; gap: 0.05rem; }
.brand__name {
  font-family: var(--font-sans);
  font-size: 0.95rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.25;
  white-space: nowrap;
}
.brand__tagline {
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.1em;
  color: var(--fog);
  line-height: 1.3;
  white-space: nowrap;
}

.arena-header[data-scrolled] .brand__mark { width: 28px; height: 28px; }

/* 栏目浮岛 */
.nav-shell {
  display: flex;
  align-items: center;
  gap: 0.25rem;
  padding: 0.35rem;
  border: 1px solid rgba(199, 210, 222, 0.14);
  border-radius: var(--radius-pill);
  background: rgba(6, 22, 37, 0.74);
  -webkit-backdrop-filter: blur(14px);
  backdrop-filter: blur(14px);
  transition: background-color 0.28s var(--ease), border-color 0.28s var(--ease);
}

.nav-shell__label,
.nav-shell__status,
.nav-shell__cta { display: none; }

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

.nav-link {
  display: inline-flex;
  align-items: baseline;
  gap: 0.34rem;
  padding: 0.48rem 0.78rem;
  border-radius: var(--radius-pill);
  color: var(--silver);
  font-family: var(--font-sans);
  font-size: 0.875rem;
  font-weight: 500;
  line-height: 1.4;
  white-space: nowrap;
  text-decoration: none;
  transition: color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.nav-link__idx {
  font-family: var(--font-mono);
  font-size: 0.6rem;
  letter-spacing: 0.06em;
  color: var(--fog);
  transition: color 0.18s var(--ease);
}
.nav-link:hover { color: var(--ice); background: rgba(18, 59, 94, 0.9); }
.nav-link:hover .nav-link__idx { color: var(--orange); }
.nav-link:focus-visible { outline: 2px solid var(--orange); outline-offset: 2px; }

.nav-link[aria-current="page"] {
  background: var(--orange);
  color: var(--ink);
  font-weight: 700;
}
.nav-link[aria-current="page"] .nav-link__idx { color: rgba(6, 22, 37, 0.7); }

/* 行动浮岛 */
.header-actions {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  flex: 0 0 auto;
}

/* 移动导航按钮 */
.nav-toggle {
  display: none;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border: 1px solid rgba(199, 210, 222, 0.26);
  border-radius: var(--radius-pill);
  background: rgba(11, 37, 61, 0.92);
  color: var(--ice);
  cursor: pointer;
  transition: border-color 0.18s var(--ease), background-color 0.18s var(--ease);
}
.nav-toggle:hover { border-color: rgba(255, 107, 26, 0.7); }
.nav-toggle:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }

.nav-toggle__bars {
  position: relative;
  display: block;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: background-color 0.2s var(--ease);
}
.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 2px;
  border-radius: 2px;
  background: currentColor;
  transition: transform 0.24s var(--ease);
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }

.arena-header[data-open] .nav-toggle__bars { background: transparent; }
.arena-header[data-open] .nav-toggle__bars::before { transform: translateY(6px) rotate(45deg); }
.arena-header[data-open] .nav-toggle__bars::after { transform: translateY(-6px) rotate(-45deg); }

/* ---------- 6. 页脚：状态面板 ---------- */
.arena-footer {
  position: relative;
  margin-top: clamp(3.5rem, 8vw, 7rem);
  background: var(--ink-2);
  border-top: 2px solid rgba(199, 210, 222, 0.18);
  color: var(--silver);
  overflow: hidden;
}
.arena-footer::before {
  content: "";
  position: absolute;
  inset: -60% 45% 40% -20%;
  background: radial-gradient(circle at 34% 34%, rgba(255, 107, 26, 0.2), transparent 62%);
  pointer-events: none;
}
.arena-footer__slash {
  position: absolute;
  inset: auto 0 0 0;
  height: 6px;
  background: linear-gradient(96deg, var(--orange) 0 18%, rgba(199, 210, 222, 0.18) 18% 100%);
  opacity: 0.85;
}

.arena-footer__inner {
  position: relative;
  z-index: 1;
  width: min(var(--page-max), 100%);
  margin-inline: auto;
  padding: clamp(2.5rem, 6vw, 4.5rem) var(--gutter) clamp(1.5rem, 3vw, 2.25rem);
  display: grid;
  grid-template-columns: minmax(0, 1.05fr) minmax(0, 1.45fr);
  gap: clamp(1.75rem, 4vw, 3.5rem);
}

/* 页脚品牌叙述 */
.brand--footer {
  background: rgba(6, 22, 37, 0.55);
  border-color: rgba(199, 210, 222, 0.24);
  padding: 0.55rem 1.1rem 0.55rem 0.6rem;
}
.brand--footer:hover { background: rgba(18, 59, 94, 0.8); }

.footer-lead { display: grid; gap: 1rem; align-content: start; }
.footer-lead__statement {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.05rem, 1.9vw, 1.4rem);
  line-height: 1.45;
  color: var(--ice);
  letter-spacing: 0.005em;
  max-width: 26ch;
}
.footer-lead__note {
  font-size: 0.8125rem;
  line-height: 1.8;
  color: var(--fog);
  max-width: 40ch;
  padding-left: 0.85rem;
  border-left: 2px solid rgba(255, 107, 26, 0.55);
}

/* 页脚链接栏 */
.footer-cols {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(1rem, 2.5vw, 2rem);
}
.footer-col { display: grid; gap: 0.85rem; align-content: start; }
.footer-col__title {
  display: flex;
  align-items: baseline;
  gap: 0.45rem;
  font-family: var(--font-sans);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--ice);
  padding-bottom: 0.65rem;
  border-bottom: 1px solid rgba(199, 210, 222, 0.2);
}
.footer-col__idx {
  font-family: var(--font-mono);
  font-size: 0.65rem;
  font-weight: 400;
  letter-spacing: 0.1em;
  color: var(--orange);
}
.footer-col__list { display: grid; gap: 0.5rem; }
.footer-link {
  display: inline-block;
  font-size: 0.875rem;
  color: var(--silver);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}
.footer-link:hover { color: var(--orange); border-bottom-color: var(--orange); }
.footer-link:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }

/* 页脚联络读数面板 */
.footer-console {
  grid-column: 1 / -1;
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  border: 2px solid rgba(199, 210, 222, 0.16);
  border-radius: var(--radius-card);
  background: rgba(6, 22, 37, 0.62);
  overflow: hidden;
}
.footer-console__cell {
  display: grid;
  gap: 0.3rem;
  padding: 0.95rem 1.05rem;
  border-right: 1px solid rgba(199, 210, 222, 0.12);
  border-bottom: 1px solid rgba(199, 210, 222, 0.12);
}
.footer-console__cell:nth-child(4n) { border-right: 0; }
.footer-console__key {
  font-family: var(--font-mono);
  font-size: 0.64rem;
  letter-spacing: 0.14em;
  color: var(--fog);
}
.footer-console__val {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--ice);
  word-break: break-word;
}

/* 版权条 */
.footer-base {
  grid-column: 1 / -1;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.5rem 1.5rem;
  padding-top: 1rem;
  border-top: 1px solid rgba(199, 210, 222, 0.14);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--fog);
}
.footer-base__icp { color: var(--silver); }
.footer-base__meta { color: rgba(126, 152, 178, 0.85); }

/* ---------- 7. 通用组件 ---------- */
.panel {
  background: var(--ink-2);
  border: 2px solid rgba(199, 210, 222, 0.14);
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-brut);
  padding: clamp(1rem, 2.4vw, 1.75rem);
}

.card {
  position: relative;
  background: var(--ink-3);
  border: 2px solid rgba(199, 210, 222, 0.16);
  border-radius: var(--radius-card);
  padding: clamp(0.95rem, 2vw, 1.5rem);
  transition: border-color 0.2s var(--ease), transform 0.2s var(--ease);
}
.card:hover { border-color: rgba(255, 107, 26, 0.6); transform: translateY(-2px); }

.data-chip {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.28rem 0.65rem;
  border: 1px solid rgba(199, 210, 222, 0.26);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  line-height: 1.6;
  color: var(--silver);
}
.data-chip--accent { border-color: rgba(255, 107, 26, 0.6); color: var(--orange); }

.status-dot {
  flex: 0 0 auto;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--green);
  box-shadow: 0 0 0 3px rgba(105, 211, 111, 0.18);
}
.status-dot--live { animation: bw-pulse 2.6s ease-in-out infinite; }

@keyframes bw-pulse {
  0%, 100% { box-shadow: 0 0 0 3px rgba(105, 211, 111, 0.18); }
  50% { box-shadow: 0 0 0 6px rgba(105, 211, 111, 0.05); }
}

/* ---------- 8. 图片容器基础规则 ---------- */
.media {
  position: relative;
  display: block;
  overflow: hidden;
  aspect-ratio: 16 / 10;
  border: 2px solid rgba(199, 210, 222, 0.16);
  border-radius: var(--radius-card);
  background:
    linear-gradient(158deg, var(--ink-3) 0%, var(--ink-2) 58%, var(--ink) 100%);
}
.media > img,
.media > picture,
.media > picture > img,
.media > video {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 46%;
  background: linear-gradient(180deg, rgba(6, 22, 37, 0) 0%, rgba(6, 22, 37, 0.78) 100%);
  pointer-events: none;
}
.media--wide { aspect-ratio: 21 / 9; }
.media--tall { aspect-ratio: 3 / 4; }
.media--square { aspect-ratio: 1 / 1; }

.media__tag {
  position: absolute;
  z-index: 2;
  left: 0.7rem;
  bottom: 0.7rem;
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-pill);
  background: rgba(6, 22, 37, 0.82);
  border: 1px solid rgba(199, 210, 222, 0.24);
  font-family: var(--font-mono);
  font-size: 0.65rem;
  letter-spacing: 0.08em;
  color: var(--ice);
}

/* ---------- 9. 面包屑与长文 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.08em;
  color: var(--fog);
}
.breadcrumb li { display: inline-flex; align-items: center; gap: 0.45rem; }
.breadcrumb li + li::before {
  content: "／";
  color: rgba(126, 152, 178, 0.6);
}
.breadcrumb a {
  color: var(--silver);
  text-decoration: none;
  transition: color 0.18s var(--ease);
}
.breadcrumb a:hover { color: var(--orange); }
.breadcrumb a:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }

.prose {
  max-width: 68ch;
  color: var(--silver);
  font-size: 1rem;
  line-height: 1.85;
}
.prose > * + * { margin-top: 1.1em; }
.prose h2 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.35rem, 2.4vw, 1.75rem);
  line-height: 1.35;
  color: var(--ice);
}
.prose h3 {
  font-family: var(--font-sans);
  font-weight: 700;
  font-size: 1.0625rem;
  color: var(--ice);
}
.prose a { color: var(--orange); text-underline-offset: 3px; }
.prose a:focus-visible { outline: 2px solid var(--orange); outline-offset: 3px; }
.prose ul { list-style: none; display: grid; gap: 0.5rem; }
.prose ul li { padding-left: 1.1rem; position: relative; }
.prose ul li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 8px;
  height: 2px;
  background: var(--orange);
}
.prose strong { color: var(--ice); }

/* ---------- 10. 滚动显现协议 ---------- */
[data-reveal] {
  transition: opacity 0.38s var(--ease) var(--reveal-delay),
              transform 0.38s var(--ease) var(--reveal-delay);
}
[data-reveal].is-pending {
  opacity: 0;
  transform: translateY(22px);
}
[data-reveal].is-revealed {
  opacity: 1;
  transform: none;
}

/* ---------- 11. 响应式 ---------- */
@media (min-width: 1024px) {
  body { background-attachment: fixed; }
}

@media (max-width: 1180px) {
  .brand__tagline { display: none; }
  .nav-link { padding: 0.44rem 0.6rem; font-size: 0.8125rem; }
  .nav-link__idx { display: none; }
}

@media (max-width: 1000px) {
  .header-actions__secondary { display: none; }
}

@media (max-width: 900px) {
  .arena-header { --hdr-pad: 0.5rem; }
  .arena-header__inner { gap: 0.5rem; }

  .brand { padding: 0.42rem 0.8rem 0.42rem 0.45rem; gap: 0.55rem; }
  .brand__mark { width: 28px; height: 28px; }
  .brand__name { font-size: 0.875rem; }

  .nav-toggle { display: inline-flex; }
  .header-actions .btn { display: none; }

  .nav-shell {
    position: fixed;
    left: 0;
    right: 0;
    bottom: 0;
    z-index: 130;
    margin: 0 0.75rem calc(0.75rem + env(safe-area-inset-bottom));
    padding: 0.9rem 0.9rem 0.95rem;
    flex-direction: column;
    align-items: stretch;
    gap: 0.75rem;
    border-radius: 18px;
    border-color: rgba(199, 210, 222, 0.24);
    background: rgba(6, 22, 37, 0.97);
    box-shadow: 0 -26px 60px -24px rgba(0, 0, 0, 0.95);
    opacity: 0;
    visibility: hidden;
    transform: translateY(calc(100% + 2.5rem));
    transition: transform 0.34s var(--ease), opacity 0.24s var(--ease), visibility 0.34s linear;
  }
  .arena-header[data-open] .nav-shell {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
  }

  .nav-shell__label {
    display: block;
    font-family: var(--font-mono);
    font-size: 0.64rem;
    letter-spacing: 0.18em;
    color: var(--fog);
  }
  .nav-list {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.4rem;
    width: 100%;
  }
  .nav-link {
    display: flex;
    align-items: baseline;
    gap: 0.4rem;
    padding: 0.68rem 0.75rem;
    border-radius: 10px;
    background: rgba(18, 59, 94, 0.55);
    font-size: 0.875rem;
    color: var(--ice);
  }
  .nav-link__idx { display: inline; font-size: 0.62rem; color: var(--fog); }
  .nav-link[aria-current="page"] { background: var(--orange); color: var(--ink); }

  .nav-shell__status {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-family: var(--font-mono);
    font-size: 0.68rem;
    letter-spacing: 0.08em;
    color: var(--fog);
    padding-top: 0.65rem;
    border-top: 1px solid rgba(199, 210, 222, 0.14);
  }
  .nav-shell__cta { display: inline-flex; width: 100%; }

  .arena-footer__inner {
    grid-template-columns: minmax(0, 1fr);
    gap: 2rem;
  }
  .footer-console { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-console__cell:nth-child(4n) { border-right: 1px solid rgba(199, 210, 222, 0.12); }
  .footer-console__cell:nth-child(2n) { border-right: 0; }
}

@media (max-width: 620px) {
  #main-content { padding-top: 5rem; }
  .footer-cols { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .footer-console { grid-template-columns: minmax(0, 1fr); }
  .footer-console__cell { border-right: 0; }
  .footer-base { flex-direction: column; align-items: flex-start; }
  .footer-lead__statement { max-width: none; }
  .display--skew { transform: none; }
}

/* ---------- 12. 焦点与减弱动效 ---------- */
:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 3px;
}

@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;
  }
  [data-reveal].is-pending { opacity: 1; transform: none; }
  .status-dot--live { animation: none; }
}