/* ============================================================
   爱游戏赛场 — /assets/site.css
   共享外壳：轨道导航 / 页脚 / 变量 / 排版 / 通用组件
   ============================================================ */

:root {
  --ink-night: #0A1A2F;
  --ink-night-2: #12294A;
  --ink-deep: #061020;
  --snow: #F4F7FB;
  --snow-2: #E1E8F2;
  --saffron: #C0392B;
  --saffron-deep: #8E2A22;
  --gold: #D6A64B;
  --teal: #3FB8A3;
  --charcoal: #1B2430;
  --mist: #5C6F86;
  --glass: rgba(244, 247, 251, 0.12);
  --glass-strong: rgba(244, 247, 251, 0.2);
  --line-dark: rgba(244, 247, 251, 0.16);
  --line-light: rgba(27, 36, 48, 0.14);

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

  --track-w: 104px;
  --wrap-max: 1280px;
  --gutter: 28px;
  --band-gap: 96px;

  --ease: cubic-bezier(0.2, 0.7, 0.3, 1);
  --dur: 160ms;

  --radius-s: 4px;
  --radius-m: 8px;
  --radius-l: 14px;
}

/* ---------- reset ---------- */
*,
*::before,
*::after { box-sizing: border-box; }

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

body {
  margin: 0;
  background: var(--ink-night);
  color: var(--snow);
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.75;
  text-rendering: optimizeLegibility;
  -webkit-font-smoothing: antialiased;
}

h1, h2, h3, h4, h5, h6, p, figure, blockquote, dl, dd, ul, ol { margin: 0; }
ul, ol { padding: 0; list-style: none; }
img, svg, video { display: block; max-width: 100%; height: auto; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; margin: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
hr { border: 0; border-top: 1px solid var(--line-dark); margin: 0; }

::selection { background: var(--saffron); color: #fff; }

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

/* ---------- 排版 ---------- */
h1, h2, h3 {
  font-family: var(--font-display);
  font-weight: 800;
  line-height: 1.18;
  letter-spacing: 0.01em;
}
h4, h5, h6 {
  font-family: var(--font-body);
  font-weight: 700;
  line-height: 1.4;
}
h1 { font-size: clamp(2.25rem, 5vw, 4.25rem); }
h2 { font-size: clamp(1.75rem, 3vw, 2.5rem); }
h3 { font-size: clamp(1.25rem, 1.8vw, 1.5rem); }

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

.eyebrow {
  display: inline-block;
  font-family: var(--font-body);
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}

.prose { max-width: 66ch; }
.prose p + p { margin-top: 1.1em; }
.prose h2 { margin-top: 2.2em; margin-bottom: 0.6em; }
.prose h3 { margin-top: 1.8em; margin-bottom: 0.5em; }
.prose ul, .prose ol { padding-left: 1.4em; margin: 1em 0; }
.prose ul { list-style: disc; }
.prose ol { list-style: decimal; }
.prose li + li { margin-top: 0.4em; }
.prose a { color: var(--gold); text-decoration: underline; text-underline-offset: 4px; }
.prose strong { color: var(--snow); font-weight: 700; }

/* ---------- 布局 ---------- */
.content-wrap {
  width: 100%;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding-inline: var(--gutter);
}

@media (min-width: 900px) {
  .site-header ~ * .content-wrap,
  .content-wrap { max-width: var(--wrap-max); }
  body { padding-left: var(--track-w); }
  body > .content-wrap { padding-inline: 48px; }
}

.grid-12 {
  display: grid;
  grid-template-columns: repeat(12, minmax(0, 1fr));
  gap: 24px;
}
.col-4 { grid-column: span 12; }
.col-5 { grid-column: span 12; }
.col-7 { grid-column: span 12; }
.col-8 { grid-column: span 12; }

@media (min-width: 760px) {
  .col-4 { grid-column: span 6; }
  .col-5 { grid-column: span 6; }
  .col-7 { grid-column: span 6; }
  .col-8 { grid-column: span 12; }
}
@media (min-width: 1024px) {
  .col-4 { grid-column: span 4; }
  .col-5 { grid-column: span 5; }
  .col-7 { grid-column: span 7; }
  .col-8 { grid-column: span 8; }
}

/* ---------- skip link ---------- */
.skip-link {
  position: absolute;
  top: -100px;
  left: 12px;
  z-index: 200;
  padding: 10px 18px;
  background: var(--saffron);
  color: #fff;
  font-size: 0.875rem;
  font-weight: 700;
  border-radius: var(--radius-s);
  transition: top var(--dur) var(--ease);
}
.skip-link:focus { top: 12px; }

/* ---------- 头部：移动品牌条 ---------- */
.header-bar {
  position: sticky;
  top: 0;
  z-index: 90;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 20px;
  background: linear-gradient(180deg, rgba(10, 26, 47, 0.97), rgba(10, 26, 47, 0.88));
  border-bottom: 1px solid var(--line-dark);
  backdrop-filter: blur(8px);
}

.brand { display: block; }
.brand__name {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--snow);
}
.brand__tagline {
  display: block;
  color: var(--mist);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  line-height: 1.4;
}
.brand--bar .brand__name { font-size: 1.125rem; }
.brand--bar .brand__tagline {
  color: rgba(244, 247, 251, 0.5);
  font-size: 0.625rem;
  letter-spacing: 0.1em;
}

.nav-toggle {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius-s);
  color: var(--snow);
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.14em;
}
.nav-toggle__bars { display: grid; gap: 4px; width: 18px; }
.nav-toggle__bars i {
  display: block;
  height: 2px;
  background: var(--snow);
  transition: transform var(--dur) var(--ease), opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:first-child { transform: translateY(3px) rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:last-child { transform: translateY(-3px) rotate(-45deg); }
.nav-toggle[aria-expanded="true"] { border-color: var(--saffron); }

/* ---------- 头部：轨道导航（移动端为抽屉） ---------- */
.is-nav {
  position: fixed;
  inset: 0 0 0 auto;
  width: min(88vw, 360px);
  z-index: 120;
  background: linear-gradient(170deg, var(--ink-night-2), var(--ink-night) 58%, var(--ink-deep));
  border-left: 1px solid var(--line-dark);
  transform: translateX(104%);
  visibility: hidden;
  transition: transform 220ms var(--ease), visibility 220ms var(--ease);
  overflow-y: auto;
  overscroll-behavior: contain;
}
.is-nav[data-open] { transform: translateX(0); visibility: visible; }

.is-nav__inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
  min-height: 100%;
  padding: 24px 20px 32px;
}

.brand--track {
  padding-bottom: 16px;
  border-bottom: 1px solid var(--line-dark);
}
.brand--track .brand__name { font-size: 1.25rem; }
.brand--track .brand__tagline { margin-top: 4px; color: rgba(244, 247, 251, 0.55); letter-spacing: 0.06em; }

.nav-list { display: grid; gap: 2px; }

.nav-link {
  position: relative;
  display: grid;
  grid-template-columns: 2.5em 1fr;
  align-items: center;
  gap: 10px;
  padding: 12px 12px 12px 10px;
  border-left: 2px solid transparent;
  color: rgba(244, 247, 251, 0.78);
  font-size: 0.9375rem;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}
.nav-link__index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  color: var(--mist);
  letter-spacing: 0.08em;
  transition: color var(--dur) var(--ease);
}
.nav-link__label { font-weight: 600; letter-spacing: 0.02em; }
.nav-link::after {
  content: "";
  position: absolute;
  left: 10px;
  right: 12px;
  bottom: 8px;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.nav-link:hover,
.nav-link:focus-visible { color: var(--snow); border-left-color: var(--saffron); background: var(--glass); }
.nav-link:hover::after,
.nav-link:focus-visible::after { transform: scaleX(1); }
.nav-link:hover .nav-link__index,
.nav-link:focus-visible .nav-link__index { color: var(--gold); }
.nav-link[aria-current="page"] {
  color: var(--snow);
  border-left-color: var(--saffron);
  background: linear-gradient(90deg, rgba(192, 57, 43, 0.28), rgba(192, 57, 43, 0));
}
.nav-link[aria-current="page"] .nav-link__index { color: var(--saffron); }
.nav-link[aria-current="page"]::after { transform: scaleX(1); background: var(--saffron); }

.track-foot {
  margin-top: auto;
  padding-top: 18px;
  border-top: 1px solid var(--line-dark);
}
.track-foot__meta {
  font-size: 0.75rem;
  color: rgba(244, 247, 251, 0.6);
  margin-bottom: 12px;
}
.track-foot__meta .mono { color: var(--teal); margin-right: 6px; }

/* ---------- 按钮 ---------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 13px 24px;
  border: 1px solid transparent;
  border-radius: var(--radius-s);
  font-family: var(--font-body);
  font-size: 0.9375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1.2;
  text-align: center;
  transition: background-color var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}
.btn--primary {
  background: var(--saffron);
  color: #fff;
  border-color: var(--saffron);
}
.btn--primary:hover,
.btn--primary:focus-visible { background: var(--saffron-deep); border-color: var(--saffron-deep); }
.btn--ghost {
  background: transparent;
  color: var(--snow);
  border-color: var(--line-dark);
}
.btn--ghost:hover,
.btn--ghost:focus-visible { border-color: var(--saffron); color: #fff; background: rgba(192, 57, 43, 0.18); }
.btn--sm { padding: 9px 16px; font-size: 0.8125rem; }
.btn:active { transform: translateY(1px); }

/* ---------- 章节色带 / 刻度 ---------- */
.section-band {
  display: grid;
  grid-template-columns: auto 1fr;
  align-items: baseline;
  gap: 18px;
  padding: 18px 0 14px;
  border-top: 1px solid var(--line-dark);
}
.section-band__no {
  font-family: var(--font-mono);
  font-size: 2rem;
  font-variant-numeric: tabular-nums;
  color: var(--gold);
  line-height: 1;
}
.section-band__title {
  font-family: var(--font-display);
  font-size: 1.125rem;
  font-weight: 800;
  letter-spacing: 0.04em;
}
.section-band--light { border-top-color: var(--line-light); color: var(--charcoal); }
.section-band--light .section-band__no { color: var(--saffron); }

/* ---------- 框景角标 ---------- */
.frame-corner {
  position: relative;
  padding: 26px;
}
.frame-corner::before,
.frame-corner::after {
  content: "";
  position: absolute;
  width: 26px;
  height: 26px;
  border: 1px solid var(--gold);
  pointer-events: none;
}
.frame-corner::before { top: 0; left: 0; border-right: 0; border-bottom: 0; }
.frame-corner::after { bottom: 0; right: 0; border-left: 0; border-top: 0; }

/* ---------- 面包屑 ---------- */
.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-size: 0.75rem;
  color: var(--mist);
  margin: 24px 0 32px;
}
.breadcrumb__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  color: rgba(92, 111, 134, 0.6);
}
.breadcrumb__item a { color: inherit; text-decoration: none; }
.breadcrumb__item a:hover { color: var(--gold); }
.breadcrumb__item[aria-current="page"] { color: var(--snow); }

/* ---------- 玻璃层 / 展签 / 数字 ---------- */
.glass-panel {
  background: var(--glass);
  border: 1px solid var(--glass-strong);
  border-radius: var(--radius-m);
  padding: 22px;
  backdrop-filter: blur(6px);
}

.exhibit-tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 4px 10px;
  border: 1px solid var(--line-dark);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.08em;
  color: rgba(244, 247, 251, 0.82);
  white-space: nowrap;
}
.exhibit-tag--live { background: var(--saffron); border-color: var(--saffron); color: #fff; }
.exhibit-tag--gold { background: rgba(214, 166, 75, 0.14); border-color: var(--gold); color: var(--gold); }
.exhibit-tag--teal { background: rgba(63, 184, 163, 0.14); border-color: var(--teal); color: var(--teal); }

.data-figure { display: block; }
.data-figure__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2rem, 4vw, 3rem);
  line-height: 1;
  color: var(--gold);
  font-variant-numeric: tabular-nums;
}
.data-figure__label {
  display: block;
  margin-top: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--mist);
}

/* ---------- 图片容器基础（页面阶段放置占位） ---------- */
.media-frame {
  position: relative;
  width: 100%;
  aspect-ratio: 16 / 9;
  overflow: hidden;
  border-radius: var(--radius-m);
  background: linear-gradient(150deg, var(--ink-night-2), var(--ink-deep));
  border: 1px solid var(--line-dark);
  box-shadow: inset 0 0 0 1px rgba(244, 247, 251, 0.04);
}
.media-frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(63, 184, 163, 0.12), transparent 45%, rgba(192, 57, 43, 0.16));
  pointer-events: none;
}
.media-frame > img,
.media-frame > picture > img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.media-frame--wide { aspect-ratio: 21 / 9; }
.media-frame--tall { aspect-ratio: 4 / 5; }
.media-frame--square { aspect-ratio: 1 / 1; }

/* ---------- 折叠面板 ---------- */
.disclosure {
  border-top: 1px solid var(--line-dark);
  padding: 4px 0;
}
.disclosure > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 0;
  cursor: pointer;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1rem;
  list-style: none;
}
.disclosure > summary::-webkit-details-marker { display: none; }
.disclosure > summary::after {
  content: "+";
  font-family: var(--font-mono);
  color: var(--gold);
  font-size: 1.125rem;
  transition: transform var(--dur) var(--ease);
}
.disclosure[open] > summary::after { transform: rotate(45deg); }
.disclosure__body { padding: 0 0 18px; color: rgba(244, 247, 251, 0.76); font-size: 0.9375rem; }

/* ---------- 滚动进度 ---------- */
.scroll-progress {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 3px;
  z-index: 150;
  background: transparent;
  pointer-events: none;
}
.scroll-progress::before {
  content: "";
  display: block;
  height: 100%;
  width: calc(var(--progress, 0) * 100%);
  background: linear-gradient(90deg, var(--teal), var(--gold), var(--saffron));
  transition: width 80ms linear;
}

/* ---------- 页脚 ---------- */
.site-footer {
  position: relative;
  margin-top: var(--band-gap);
  background: linear-gradient(180deg, var(--ink-night) 0%, var(--ink-night-2) 62%, var(--ink-deep) 100%);
  border-top: 1px solid var(--line-dark);
  overflow: hidden;
}
.site-footer__glow {
  position: absolute;
  top: -120px;
  left: -10%;
  width: 70%;
  height: 260px;
  background: radial-gradient(ellipse at 30% 50%, rgba(63, 184, 163, 0.18), transparent 65%),
              radial-gradient(ellipse at 60% 40%, rgba(214, 166, 75, 0.14), transparent 70%);
  pointer-events: none;
}
.site-footer__inner {
  position: relative;
  max-width: var(--wrap-max);
  margin-inline: auto;
  padding: 64px var(--gutter) 28px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  padding-bottom: 44px;
  border-bottom: 1px solid var(--line-dark);
}
.footer-brand__name {
  font-family: var(--font-display);
  font-size: 1.5rem;
  font-weight: 800;
  letter-spacing: 0.04em;
  color: var(--snow);
}
.footer-brand__line {
  margin-top: 10px;
  max-width: 30ch;
  color: rgba(244, 247, 251, 0.66);
  font-size: 0.9375rem;
}
.footer-brand__note {
  margin-top: 16px;
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--teal);
}

.footer-col__title {
  font-size: 0.6875rem;
  font-weight: 800;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
  margin-bottom: 16px;
}

.footer-links__list { display: grid; gap: 10px; }
.footer-links__list a {
  display: inline-block;
  position: relative;
  color: rgba(244, 247, 251, 0.76);
  font-size: 0.9375rem;
  transition: color var(--dur) var(--ease);
}
.footer-links__list a::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 1px;
  background: var(--gold);
  transform: scaleX(0);
  transform-origin: left;
  transition: transform var(--dur) var(--ease);
}
.footer-links__list a:hover,
.footer-links__list a:focus-visible { color: var(--snow); }
.footer-links__list a:hover::after,
.footer-links__list a:focus-visible::after { transform: scaleX(1); }

.footer-contact__list { display: grid; gap: 12px; }
.footer-contact__list li {
  display: grid;
  grid-template-columns: 3.2em 1fr;
  gap: 10px;
  font-size: 0.875rem;
  color: rgba(244, 247, 251, 0.8);
  word-break: break-word;
}
.footer-contact__key {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.1em;
  color: var(--mist);
  padding-top: 3px;
}
.footer-contact__list a { color: var(--snow); border-bottom: 1px solid rgba(214, 166, 75, 0.4); }
.footer-contact__list a:hover { border-bottom-color: var(--gold); color: var(--gold); }
.footer-contact__note {
  margin-top: 16px;
  padding-top: 14px;
  border-top: 1px dashed var(--line-dark);
  font-size: 0.75rem;
  color: rgba(244, 247, 251, 0.55);
  line-height: 1.7;
}

.footer-legal {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px 24px;
  padding-top: 24px;
  font-size: 0.75rem;
  color: rgba(244, 247, 251, 0.55);
}
.footer-legal__hint { color: var(--teal); letter-spacing: 0.06em; font-size: 0.6875rem; }
.footer-legal__links { display: flex; flex-wrap: wrap; gap: 8px 18px; }
.footer-legal__links a { color: rgba(244, 247, 251, 0.7); transition: color var(--dur) var(--ease); }
.footer-legal__links a:hover,
.footer-legal__links a:focus-visible { color: var(--gold); }
.footer-legal__copy { margin-left: auto; }

/* ---------- 平板 ---------- */
@media (min-width: 760px) {
  :root { --gutter: 36px; }
  .footer-grid { grid-template-columns: 1.2fr 1fr 1.3fr; gap: 32px; }
  .footer-legal { font-size: 0.75rem; }
}

/* ---------- 桌面：轨道导航切换为固定侧栏 ---------- */
@media (min-width: 900px) {
  :root { --gutter: 40px; }

  .header-bar { display: none; }

  .is-nav {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    right: auto;
    width: var(--track-w);
    transform: none;
    visibility: visible;
    border-left: 0;
    border-right: 1px solid var(--line-dark);
    background: linear-gradient(180deg, var(--ink-night-2) 0%, var(--ink-night) 46%, var(--ink-deep) 100%);
    overflow: visible;
  }
  .is-nav__inner {
    padding: 28px 14px 26px;
    gap: 18px;
  }
  .brand--track { padding-bottom: 18px; }
  .brand--track .brand__name {
    font-size: 1rem;
    line-height: 1.35;
    letter-spacing: 0.08em;
    word-break: break-word;
  }
  .brand--track .brand__tagline { font-size: 0.625rem; letter-spacing: 0.08em; }

  .nav-list { gap: 0; }
  .nav-link {
    grid-template-columns: 1fr;
    gap: 0;
    padding: 14px 8px 14px 10px;
  }
  .nav-link__index { font-size: 0.625rem; }
  .nav-link__label {
    font-size: 0.8125rem;
    line-height: 1.35;
    margin-top: 3px;
    display: block;
  }
  .nav-link::after { left: 10px; right: 8px; bottom: 8px; }

  .track-foot { padding-top: 16px; }
  .track-foot__meta { font-size: 0.6875rem; line-height: 1.55; }
  .track-foot .btn { width: 100%; padding: 9px 8px; font-size: 0.75rem; letter-spacing: 0.02em; }

  .site-footer { margin-left: 0; }
  .site-footer__inner { padding: 82px var(--gutter) 32px; }
}

@media (min-width: 1200px) {
  :root { --track-w: 112px; --gutter: 56px; }
  .brand--track .brand__name { font-size: 1.0625rem; }
  .nav-link__label { font-size: 0.875rem; }
}

/* ---------- 抽屉遮罩（移动端） ---------- */
.nav-scrim {
  position: fixed;
  inset: 0;
  z-index: 110;
  background: rgba(6, 16, 32, 0.72);
  backdrop-filter: blur(3px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 200ms var(--ease), visibility 200ms var(--ease);
}
.nav-scrim[data-open] { opacity: 1; visibility: visible; }

@media (min-width: 900px) {
  .nav-scrim { display: none; }
}

/* 抽屉打开时锁定滚动 */
body[data-nav-locked] { overflow: hidden; }

/* ---------- 减少动态偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
  .scroll-progress::before { transition: none; }
}