/* ============================================================
   6686体育会馆 · 共享样式表 /assets/site.css
   分屏对照 / 竞技档案馆 × 夜间数据看台
   ============================================================ */

:root {
  --color-surface: #f9f9f9;
  --color-surface-alt: #efefef;
  --color-surface-deep: #e2e1e1;
  --color-ink: #37312f;
  --color-ink-soft: #645c58;
  --color-ink-muted: #817774;
  --color-line: #d6d5d5;
  --color-primary: #bc5834;
  --color-primary-ink: #ffffff;
  --color-primary-soft: #f0e2dd;
  --color-accent: #1977cd;
  --color-accent-ink: #ffffff;
  --color-highlight: #d1e2f1;
  --color-focus: #0d72cf;
  --color-contrast-surface: #211714;
  --color-contrast-ink: #e7e5e4;
  --color-contrast-line: #4d4442;
  --color-contrast-accent: #1b84e4;
  --overlay-scrim: linear-gradient(180deg, rgba(33, 23, 20, 0.35) 0%, rgba(33, 23, 20, 0.72) 55%, rgba(33, 23, 20, 0.92) 100%);
  --font-heading: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-body: "Helvetica Neue", Arial, "PingFang SC", "Microsoft YaHei", sans-serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  --text-xs: 12.2px;
  --text-sm: 15.2px;
  --text-base: 17px;
  --text-lg: 21.2px;
  --text-xl: 26.6px;
  --text-2xl: 33.2px;
  --text-3xl: 41.5px;
  --text-4xl: 51.9px;
  --text-display: clamp(38px, 7.7vw, 99px);
  --text-figure: clamp(31px, 5.5vw, 71px);
  --weight-heading: 776;
  --weight-body: 400;
  --leading-body: 1.73;
  --leading-heading: 1.27;
  --tracking-heading: 0.002em;
  --radius-sm: 3px;
  --radius-md: 4px;
  --radius-lg: 5px;
  --radius-pill: 5px;
  --border-thin: 1px;
  --border-thick: 2px;
  --shadow-1: none;
  --shadow-2: none;
  --space-1: 8px;
  --space-2: 16px;
  --space-3: 24px;
  --space-4: 32px;
  --space-6: 48px;
  --space-8: 64px;
  --container: 1200px;
  --measure: 74ch;
  --gutter: 24px;
  --section-y: 76px;
  --section-y-lg: 106px;
}

/* ---------- 1. 归零与基础排版 ---------- */

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

html {
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  scroll-behavior: smooth;
  background: var(--color-surface);
}

body {
  margin: 0;
  font-family: var(--font-body);
  font-size: var(--text-base);
  font-weight: var(--weight-body);
  line-height: var(--leading-body);
  color: var(--color-ink);
  background: var(--color-surface);
  padding-top: 72px;
  overflow-x: hidden;
  transition: padding-left 180ms linear;
}

h1, h2, h3, h4, h5, h6 {
  margin: 0;
  font-family: var(--font-heading);
  font-weight: var(--weight-heading);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: inherit;
}

p { margin: 0 0 var(--space-2); }
p:last-child { margin-bottom: 0; }

ul, ol { margin: 0; padding: 0; list-style: none; }

a { color: inherit; text-decoration: none; }

img, svg, video { display: block; max-width: 100%; height: auto; }

button, input, select, textarea {
  font: inherit;
  color: inherit;
  background: none;
  border: 0;
}

button { cursor: pointer; }

strong, b { font-weight: var(--weight-heading); }

code, kbd, samp { font-family: var(--font-mono); font-size: 0.94em; }

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

:focus-visible {
  outline: 2px solid var(--color-focus);
  outline-offset: 2px;
}

.site-header :focus-visible,
.site-footer :focus-visible,
.split__pane--deep :focus-visible,
.panel--deep :focus-visible,
.media__body :focus-visible {
  outline-color: var(--color-contrast-accent);
}

#main-content { scroll-margin-top: 88px; }

.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;
}

.skip-link {
  position: fixed;
  top: -120px;
  left: var(--space-2);
  z-index: 200;
  padding: 10px 18px;
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  transition: top 160ms linear;
}

.skip-link:focus { top: var(--space-2); }

/* ---------- 2. 头部横梁 ---------- */

.site-header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 72px;
  z-index: 70;
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.site-header__inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 72px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 100%;
  padding-inline: var(--space-3);
  border-right: var(--border-thin) solid var(--color-contrast-line);
  transition: background 160ms linear;
}

.brand:hover {
  background: color-mix(in srgb, var(--color-contrast-ink) 8%, transparent);
}

.brand__mark {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-contrast-ink);
}

.brand__name {
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  color: color-mix(in srgb, var(--color-contrast-ink) 62%, transparent);
  white-space: nowrap;
}

@media (min-width: 960px) {
  .brand { min-width: 236px; }
}

.header-readout {
  display: none;
  align-items: stretch;
  height: 72px;
  margin: 0;
  margin-inline: var(--space-2);
}

@media (min-width: 960px) {
  .header-readout {
    display: flex;
    flex: 1;
    justify-content: flex-end;
  }
}

.readout {
  display: flex;
  align-items: center;
  gap: 8px;
  padding-inline: var(--space-3);
  border-left: var(--border-thin) solid var(--color-contrast-line);
  font-size: var(--text-xs);
  line-height: 1;
  white-space: nowrap;
}

.readout__k {
  font-family: var(--font-mono);
  letter-spacing: 0.14em;
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
}

.readout__v {
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
  color: var(--color-contrast-accent);
}

.nav-toggle {
  display: flex;
  align-items: center;
  gap: 10px;
  height: 100%;
  padding-inline: var(--space-3);
  border-left: var(--border-thin) solid var(--color-contrast-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.14em;
  color: var(--color-contrast-ink);
  transition: background 160ms linear, color 160ms linear;
}

.nav-toggle:hover {
  background: color-mix(in srgb, var(--color-contrast-ink) 9%, transparent);
}

html[data-nav-open="false"] .nav-toggle {
  color: color-mix(in srgb, var(--color-contrast-ink) 52%, transparent);
}

.nav-toggle__bars {
  position: relative;
  display: block;
  flex: 0 0 auto;
  width: 18px;
  height: 12px;
}

.nav-toggle__bars::before,
.nav-toggle__bars::after {
  content: "";
  position: absolute;
  left: 0;
  width: 18px;
  height: 1px;
  background: currentColor;
  transition: transform 180ms linear, top 180ms linear, bottom 180ms linear;
}

.nav-toggle__bars::before { top: 0; }
.nav-toggle__bars::after { bottom: 0; }

@media (max-width: 959px) {
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::before,
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
    top: 50%;
    bottom: auto;
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::before {
    transform: translateY(-50%) rotate(45deg);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle__bars::after {
    transform: translateY(-50%) rotate(-45deg);
  }
}

.scroll-progress {
  position: absolute;
  left: 0;
  bottom: -1px;
  width: 0%;
  height: 2px;
  background: var(--color-accent);
  transition: width 80ms linear;
}

/* ---------- 3. 侧边轨道导航 ---------- */

.site-nav {
  position: fixed;
  top: 72px;
  bottom: 0;
  left: 0;
  z-index: 55;
  display: flex;
  flex-direction: column;
  width: 236px;
  overflow-y: auto;
  background: var(--color-surface);
  border-right: var(--border-thin) solid var(--color-line);
  transform: translateX(-100%);
  transition: transform 200ms linear;
}

html[data-nav-open="true"] .site-nav { transform: translateX(0); }

.site-nav__head {
  margin: 0;
  padding: var(--space-3) var(--space-3) var(--space-2);
  border-bottom: var(--border-thin) solid var(--color-line);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.site-nav__head--sub {
  margin-top: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.site-nav__list { display: flex; flex-direction: column; }

.site-nav__item {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.site-nav__link {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: 15px var(--space-3);
  border-left: var(--border-thick) solid transparent;
  font-size: var(--text-sm);
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
  transition: color 160ms linear, background 160ms linear, border-color 160ms linear;
}

.site-nav__link:hover {
  color: var(--color-ink);
  background: var(--color-surface-alt);
}

.site-nav__link[aria-current="page"] {
  color: var(--color-ink);
  background: var(--color-surface-deep);
  border-left-color: var(--color-primary);
  font-weight: var(--weight-heading);
}

.site-nav__label { display: block; }

.site-nav__list--sub .site-nav__link {
  padding-block: 10px;
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
}

.site-nav__list--sub .site-nav__link[aria-current="page"] {
  border-left-color: var(--color-accent);
}

.site-nav__foot {
  margin-top: auto;
  padding: var(--space-3);
  border-top: var(--border-thin) solid var(--color-line);
}

.site-nav__cta {
  display: block;
  padding: 11px 14px;
  border-radius: var(--radius-md);
  background: var(--color-primary);
  color: var(--color-primary-ink);
  text-align: center;
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.06em;
  transition: background 160ms linear;
}

.site-nav__cta:hover {
  background: color-mix(in srgb, var(--color-primary) 82%, #000);
}

.nav-scrim {
  position: fixed;
  inset: 72px 0 0 0;
  z-index: 54;
  background: color-mix(in srgb, var(--color-contrast-surface) 78%, transparent);
  opacity: 0;
  pointer-events: none;
  transition: opacity 200ms linear;
}

html[data-nav-open="true"] .nav-scrim {
  opacity: 1;
  pointer-events: auto;
}

@media (min-width: 960px) {
  body { padding-left: 236px; }
  .site-nav { transform: translateX(0); }
  html[data-nav-open="false"] body { padding-left: 0; }
  html[data-nav-open="false"] .site-nav { transform: translateX(-100%); }
  .nav-scrim { display: none; }
}

/* ---------- 4. 页脚 ---------- */

.site-footer {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
}

.site-footer__inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2) var(--space-4);
  min-height: 64px;
  padding: var(--space-3) var(--space-3);
  max-width: var(--container);
  margin-inline: auto;
  font-size: var(--text-sm);
}

.footer-brand {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  letter-spacing: 0.1em;
  color: var(--color-contrast-ink);
}

.footer-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2) var(--space-3);
  margin-inline: auto;
}

.footer-links a {
  padding-bottom: 2px;
  border-bottom: var(--border-thin) solid transparent;
  color: color-mix(in srgb, var(--color-contrast-ink) 76%, transparent);
  transition: color 160ms linear, border-color 160ms linear;
}

.footer-links a:hover {
  color: var(--color-contrast-ink);
  border-bottom-color: var(--color-contrast-accent);
}

.footer-legal {
  margin: 0;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.06em;
  color: color-mix(in srgb, var(--color-contrast-ink) 55%, transparent);
}

@media (min-width: 720px) {
  .footer-legal { text-align: right; }
}

/* ---------- 5. 结构与容器 ---------- */

.container {
  width: 100%;
  max-width: var(--container);
  margin-inline: auto;
  padding-inline: var(--space-3);
}

.section { padding-block: var(--section-y); }
.section--lg { padding-block: var(--section-y-lg); }

.rule {
  height: var(--border-thin);
  border: 0;
  margin: 0;
  background: var(--color-line);
}

.eyebrow {
  margin: 0 0 var(--space-2);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--color-ink-muted);
}

.eyebrow--deep { color: var(--color-contrast-accent); }

.grid {
  display: grid;
  gap: var(--space-3);
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 720px) {
  .grid--2 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--3 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}

@media (min-width: 1080px) {
  .grid--3 { grid-template-columns: repeat(3, minmax(0, 1fr)); }
  .grid--4 { grid-template-columns: repeat(4, minmax(0, 1fr)); }
}

/* ---------- 6. 分屏 ---------- */

.split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
}

@media (min-width: 960px) {
  .split { grid-template-columns: 7fr 5fr; }
  .split--wide-left { grid-template-columns: 8fr 4fr; }
  .split--wide-right { grid-template-columns: 4fr 8fr; }
}

.split__pane {
  padding: var(--space-6) var(--space-3);
}

@media (min-width: 960px) {
  .split__pane { padding: var(--section-y) var(--space-4); }
}

.split__pane--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-top: var(--border-thin) solid var(--color-contrast-line);
  border-bottom: var(--border-thin) solid var(--color-contrast-line);
}

.split__pane--light {
  background: var(--color-surface);
  color: var(--color-ink);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

.split__pane--alt {
  background: var(--color-surface-alt);
  color: var(--color-ink);
  border-top: var(--border-thin) solid var(--color-line);
  border-bottom: var(--border-thin) solid var(--color-line);
}

/* ---------- 7. 框体与徽标 ---------- */

.panel {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-ink);
}

.panel--alt { background: var(--color-surface-alt); }

.panel--deep {
  background: var(--color-contrast-surface);
  color: var(--color-contrast-ink);
  border-color: var(--color-contrast-line);
}

.tag {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 3px 9px;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-sm);
  background: var(--color-surface-alt);
  color: var(--color-ink-soft);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  line-height: 1.5;
  white-space: nowrap;
  transition: background 140ms linear, color 140ms linear, border-color 140ms linear;
}

.tag--primary {
  background: var(--color-primary-soft);
  border-color: color-mix(in srgb, var(--color-primary) 36%, transparent);
  color: color-mix(in srgb, var(--color-primary) 78%, #000);
}

.tag--accent {
  background: var(--color-highlight);
  border-color: color-mix(in srgb, var(--color-accent) 34%, transparent);
  color: color-mix(in srgb, var(--color-accent) 80%, #000);
}

.tag--deep {
  background: color-mix(in srgb, var(--color-contrast-ink) 12%, transparent);
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

button.tag { cursor: pointer; }

button.tag:hover {
  border-color: color-mix(in srgb, var(--color-primary) 60%, transparent);
  color: color-mix(in srgb, var(--color-primary) 84%, #000);
}

.tag[aria-pressed="true"] {
  background: var(--color-primary);
  border-color: var(--color-primary);
  color: var(--color-primary-ink);
}

.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 24px;
  padding: 2px 7px;
  border-radius: var(--radius-sm);
  background: var(--color-accent);
  color: var(--color-accent-ink);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  line-height: 1.6;
}

/* ---------- 8. 按钮 ---------- */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 11px 20px;
  border: var(--border-thin) solid transparent;
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: var(--weight-heading);
  letter-spacing: 0.04em;
  line-height: 1.2;
  transition: background 160ms linear, color 160ms linear, border-color 160ms linear;
}

.btn--primary {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.btn--primary:hover {
  background: color-mix(in srgb, var(--color-primary) 82%, #000);
}

.btn--accent {
  background: var(--color-accent);
  color: var(--color-accent-ink);
}

.btn--accent:hover {
  background: color-mix(in srgb, var(--color-accent) 82%, #000);
}

.btn--ghost {
  background: transparent;
  border-color: var(--color-line);
  color: var(--color-ink);
}

.btn--ghost:hover {
  background: var(--color-surface-alt);
  border-color: color-mix(in srgb, var(--color-primary) 55%, transparent);
  color: color-mix(in srgb, var(--color-primary) 80%, #000);
}

.btn--on-deep {
  background: transparent;
  border-color: var(--color-contrast-line);
  color: var(--color-contrast-ink);
}

.btn--on-deep:hover {
  border-color: var(--color-contrast-accent);
  color: var(--color-contrast-accent);
}

/* ---------- 9. 面包屑与正文 ---------- */

.breadcrumb {
  padding-top: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.08em;
  color: var(--color-ink-muted);
}

.breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
}

.breadcrumb li { display: inline-flex; align-items: center; gap: 6px; }

.breadcrumb li + li::before {
  content: "/";
  color: var(--color-line);
}

.breadcrumb a { color: var(--color-ink-soft); }
.breadcrumb a:hover { color: var(--color-ink); }

.prose {
  max-width: var(--measure);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
}

.prose h2 {
  margin: var(--space-6) 0 var(--space-2);
  font-size: var(--text-2xl);
}

.prose h3 {
  margin: var(--space-4) 0 var(--space-2);
  font-size: var(--text-xl);
}

.prose p { margin-bottom: var(--space-3); }
.prose p:last-child { margin-bottom: 0; }
.prose a {
  color: var(--color-primary);
  border-bottom: var(--border-thin) solid color-mix(in srgb, var(--color-primary) 45%, transparent);
}
.prose a:hover { border-bottom-color: var(--color-primary); }

/* ---------- 10. 图片容器（供页面阶段放置图片） ---------- */

.media {
  position: relative;
  overflow: hidden;
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface-deep);
}

.media__img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
}

.media--wide .media__img { aspect-ratio: 21 / 9; }
.media--square .media__img { aspect-ratio: 1 / 1; }
.media--tall .media__img { aspect-ratio: 4 / 5; }

.media__scrim {
  position: absolute;
  inset: 0;
  background: var(--overlay-scrim);
  pointer-events: none;
}

.media__body {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-3);
  color: var(--color-contrast-ink);
}

.media__eyebrow {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--color-contrast-accent);
}

/* ---------- 11. 数据块 ---------- */

.metric {
  padding: var(--space-3);
  border: var(--border-thin) solid var(--color-line);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.metric__value {
  font-family: var(--font-mono);
  font-size: var(--text-xl);
  font-weight: var(--weight-heading);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--color-primary);
}

.metric__label {
  margin-top: 6px;
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  letter-spacing: 0.12em;
  color: var(--color-ink-muted);
}

.panel--deep .metric {
  background: transparent;
  border-color: var(--color-contrast-line);
}

/* ---------- 12. 筛选与动效协议 ---------- */

.filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-1);
  padding-block: var(--space-2);
}

[data-filter-item][hidden] { display: none; }

html[data-js="on"] [data-reveal] {
  opacity: 0;
  transform: translateY(10px);
  transition: opacity 200ms linear, transform 200ms linear;
}

html[data-js="on"] [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 13. 响应式与可访问性偏好 ---------- */

@media (max-width: 719px) {
  .site-footer__inner { flex-direction: column; align-items: flex-start; }
  .footer-links { margin-inline: 0; }
}

@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }

  *,
  *::before,
  *::after {
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 1ms !important;
    scroll-behavior: auto !important;
  }

  html[data-js="on"] [data-reveal] {
    opacity: 1;
    transform: none;
  }
}