/* =========================================================
   GOGO体育主站 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 基础组件
   ========================================================= */

/* ---------- 1. Reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
h1, h2, h3, h4, h5, p, figure, blockquote, dl, dd { margin: 0; }
ul, ol { margin: 0; padding: 0; 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; }
table { width: 100%; border-collapse: collapse; }
[hidden] { display: none !important; }

/* ---------- 2. 设计变量 ---------- */
:root {
  --ink: #0A0F1A;
  --ink-2: #111C2E;
  --ink-3: #0D1524;
  --grid-line: #1E2D45;

  --accent: #A8FF2A;
  --accent-soft: #D4FF8A;
  --accent-rgb: 168, 255, 42;

  --signal: #FF6B2C;
  --signal-soft: #FFB38A;
  --signal-rgb: 255, 107, 44;

  --yellow: #F2C94C;
  --legacy: #8E2A35;
  --legacy-deep: #2A0E14;

  --text: #F4F7F2;
  --muted: #94A3B8;

  --band-echo: rgba(17, 28, 46, 0.72);
  --plate-bg: rgba(30, 45, 69, 0.35);

  --font-head: 'Noto Serif SC', 'Source Han Serif SC', 'Songti SC', serif;
  --font-body: 'Inter', 'Noto Sans SC', 'PingFang SC', sans-serif;
  --font-ui: 'Inter', 'Noto Sans SC', sans-serif;
  --font-mono: 'JetBrains Mono', 'Roboto Mono', 'SFMono-Regular', monospace;

  --max: 1320px;
  --pad: clamp(20px, 4vw, 48px);
  --read: 720px;

  --dur-1: 180ms;
  --dur-2: 240ms;
  --dur-3: 320ms;
  --ease: cubic-bezier(0.2, 0.8, 0.2, 1);
}

html[data-version="legacy"] {
  --accent: #F2C94C;
  --accent-soft: #FFB38A;
  --accent-rgb: 242, 201, 76;
  --grid-line: #3A1A22;
  --ink-2: #20090F;
  --ink-3: #150509;
  --band-echo: rgba(42, 14, 20, 0.82);
  --plate-bg: rgba(142, 42, 53, 0.22);
}

/* ---------- 3. 中文排版与页面底色 ---------- */
body {
  min-height: 100%;
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px, 72px 72px;
  background-attachment: fixed;
  color: var(--text);
  font-family: var(--font-body);
  font-size: 17px;
  font-weight: 400;
  line-height: 1.72;
  letter-spacing: 0.01em;
  -webkit-font-smoothing: antialiased;
  overflow-x: hidden;
  transition: background-color var(--dur-3) var(--ease);
}

h1, h2, h3, h4 { font-family: var(--font-head); font-weight: 800; line-height: 1.12; letter-spacing: 0.01em; }
h1 { font-size: clamp(40px, 7vw, 96px); }
h2 { font-size: clamp(28px, 4vw, 40px); }
h3 { font-size: clamp(20px, 2.4vw, 28px); }
p { text-wrap: pretty; }
strong { color: var(--accent); font-weight: 600; }

/* ---------- 4. 焦点与跳转 ---------- */
.skip-link {
  position: absolute;
  left: 16px;
  top: -120px;
  z-index: 200;
  background: var(--accent);
  color: var(--ink);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.04em;
  padding: 12px 18px;
  transition: top var(--dur-2) var(--ease);
}
.skip-link:focus { top: 12px; }

:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px rgba(var(--signal-rgb), 0.35);
}

/* ---------- 5. 头部 ---------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  background: linear-gradient(180deg, rgba(10, 15, 26, 0.98) 0%, rgba(10, 15, 26, 0.88) 100%);
  border-bottom: 1px solid var(--grid-line);
  backdrop-filter: blur(10px);
  transition: background var(--dur-3) var(--ease), border-color var(--dur-3) var(--ease);
}

.site-header__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: 18px var(--pad) 12px;
  display: grid;
  grid-template-columns: minmax(0, auto) minmax(0, 1fr);
  grid-template-areas:
    "brand nav"
    "quick quick";
  gap: 10px 40px;
  align-items: center;
}

.scroll-progress {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  overflow: hidden;
  pointer-events: none;
}
.scroll-progress__bar {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--accent) 0%, var(--signal) 100%);
  transform: scaleX(0);
  transform-origin: left center;
}

.site-header__brand-zone {
  grid-area: brand;
  display: flex;
  align-items: center;
  gap: clamp(14px, 2vw, 26px);
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 14px;
  min-height: 44px;
}
.brand__mark {
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(24px, 2.4vw, 32px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--accent);
  transform: rotate(-2deg);
  transform-origin: left center;
  transition: color var(--dur-3) var(--ease);
}
.brand__text { display: flex; flex-direction: column; gap: 2px; }
.brand__name {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--text);
}
.brand__sub {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
}
.brand--footer .brand__mark { font-size: 26px; }
.brand:hover .brand__mark { color: var(--accent-soft); }

.version-switch {
  display: inline-flex;
  border: 1px solid var(--grid-line);
  background: var(--plate-bg);
}
.version-switch__btn {
  appearance: none;
  background: transparent;
  border: 0;
  border-left: 1px solid var(--grid-line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 500;
  letter-spacing: 0.08em;
  padding: 7px 12px;
  min-height: 34px;
  cursor: pointer;
  transition: color var(--dur-1) var(--ease), background var(--dur-2) var(--ease);
}
.version-switch__btn:first-child { border-left: 0; }
.version-switch__btn:hover { color: var(--text); background: rgba(var(--accent-rgb), 0.1); }
.version-switch__btn.is-active { background: var(--accent); color: var(--ink); }
.version-switch__btn[data-version-tab="legacy"].is-active { background: var(--legacy); color: var(--yellow); }

.nav-toggle {
  grid-area: toggle;
  display: none;
  align-items: center;
  gap: 10px;
  appearance: none;
  background: var(--plate-bg);
  border: 1px solid var(--grid-line);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  padding: 10px 14px;
  cursor: pointer;
  transition: border-color var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
}
.nav-toggle:hover { border-color: var(--accent); color: var(--accent); }
.nav-toggle__bars { display: inline-flex; flex-direction: column; gap: 4px; width: 18px; }
.nav-toggle__bars span { display: block; height: 1px; background: currentColor; }
.nav-toggle__bars span:nth-child(2) { width: 70%; }

.site-nav {
  grid-area: nav;
  justify-self: end;
  max-width: 100%;
}
.site-nav__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: clamp(6px, 1.6vw, 22px);
}
.site-nav__link {
  position: relative;
  display: inline-block;
  padding: 10px 2px;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--muted);
  transition: color var(--dur-1) var(--ease);
}
.site-nav__link::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 4px;
  height: 2px;
  background: var(--accent);
  transform: scaleX(0);
  transform-origin: right center;
  transition: transform var(--dur-2) var(--ease);
}
.site-nav__link:hover { color: var(--text); }
.site-nav__link:hover::after { transform: scaleX(1); transform-origin: left center; }
.site-nav__link[aria-current="page"] { color: var(--accent); }
.site-nav__link[aria-current="page"]::after { transform: scaleX(1); }

.quick-entry {
  grid-area: quick;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: flex-end;
  gap: 10px 16px;
  padding-top: 10px;
  border-top: 1px solid var(--grid-line);
}
.quick-entry__label {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--muted);
}
.quick-entry__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 5px 12px;
  border: 1px solid var(--grid-line);
  background: var(--band-echo);
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--text);
  transition: border-color var(--dur-2) var(--ease), color var(--dur-2) var(--ease), transform var(--dur-2) var(--ease);
}
.quick-entry__link::before {
  content: "";
  width: 6px;
  height: 6px;
  background: var(--accent);
  transform: rotate(45deg);
  transition: background var(--dur-3) var(--ease);
}
.quick-entry__link--signal::before { background: var(--signal); }
.quick-entry__link:hover {
  border-color: var(--accent);
  color: var(--accent);
  transform: translateY(-1px);
}

/* ---------- 6. 页脚 ---------- */
.site-footer {
  position: relative;
  z-index: 2;
  margin-top: clamp(64px, 10vw, 128px);
  border-top: 1px solid var(--grid-line);
  background: linear-gradient(180deg, var(--ink) 0%, var(--ink-2) 46%, var(--ink) 100%);
  transition: background var(--dur-3) var(--ease);
}
.site-footer__band {
  height: 6px;
  background: linear-gradient(90deg, var(--accent) 0%, var(--accent) 28%, var(--signal) 64%, var(--legacy) 100%);
  opacity: 0.85;
}
.site-footer__inner {
  max-width: var(--max);
  margin: 0 auto;
  padding: clamp(44px, 6vw, 84px) var(--pad) clamp(32px, 4vw, 56px);
  display: grid;
  grid-template-columns: minmax(0, 4fr) minmax(0, 8fr);
  gap: 48px 56px;
}
.site-footer__lead { display: flex; flex-direction: column; align-items: flex-start; gap: 20px; }
.site-footer__summary {
  max-width: 34ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}
.site-footer__nav {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 36px 40px;
}
.footer-col { display: flex; flex-direction: column; gap: 16px; }
.footer-col__title {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
  color: var(--accent);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--grid-line);
  transition: color var(--dur-3) var(--ease);
}
.footer-col__list { display: flex; flex-direction: column; gap: 10px; }
.footer-col__list a {
  display: inline-block;
  font-size: 15px;
  color: var(--muted);
  transition: color var(--dur-1) var(--ease), transform var(--dur-2) var(--ease);
}
.footer-col__list a:hover { color: var(--text); transform: translateX(3px); }
.footer-col--contact { min-width: 0; }

.contact-line {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 9px 0;
  border-bottom: 1px solid var(--grid-line);
  font-family: var(--font-mono);
  font-size: 12.5px;
}
.contact-line__key { color: var(--muted); letter-spacing: 0.08em; }
.contact-line__value { color: var(--text); word-break: break-all; }

.copy-btn {
  appearance: none;
  background: transparent;
  border: 1px solid var(--grid-line);
  color: var(--muted);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  padding: 5px 10px;
  cursor: pointer;
  transition: border-color var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
}
.copy-btn:hover { border-color: var(--signal); color: var(--signal); }
.copy-btn[data-copy-state="done"] { border-color: var(--accent); color: var(--accent); }
.copy-btn[data-copy-state="failed"] { border-color: var(--signal); color: var(--signal); }

.site-footer__meta {
  max-width: var(--max);
  margin: 0 auto;
  padding: 20px var(--pad) 34px;
  border-top: 1px solid var(--grid-line);
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  gap: 12px 32px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
}
.footer-note { max-width: 62ch; }
.footer-legal { color: var(--muted); }

/* ---------- 7. 基础组件 ---------- */
.container {
  width: 100%;
  max-width: var(--max);
  margin-inline: auto;
  padding-inline: var(--pad);
}

.section { padding-block: clamp(56px, 9vw, 112px); }
.section--band {
  background: var(--band-echo);
  border-top: 1px solid var(--grid-line);
  border-bottom: 1px solid var(--grid-line);
}
.section__head { display: flex; flex-direction: column; gap: 18px; margin-bottom: clamp(28px, 4vw, 48px); }

.plate {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  align-self: flex-start;
  padding: 6px 12px;
  border: 1px solid var(--grid-line);
  background: var(--plate-bg);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--accent);
  transition: color var(--dur-3) var(--ease), border-color var(--dur-3) var(--ease);
}
.plate::before { content: ""; width: 7px; height: 7px; background: currentColor; transform: rotate(45deg); }
.plate--signal { color: var(--signal); }
.plate--legacy { color: var(--yellow); border-color: var(--legacy); background: rgba(142, 42, 53, 0.2); }

.prose { max-width: var(--read); }
.prose p + p { margin-top: 20px; }
.prose h2, .prose h3 { margin-top: 44px; margin-bottom: 16px; }

.data-figure {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(40px, 7vw, 96px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
  transition: color var(--dur-3) var(--ease);
}

.grid { display: grid; gap: 24px; }
.grid--12 { grid-template-columns: repeat(12, minmax(0, 1fr)); }
.col-3 { grid-column: span 3; }
.col-4 { grid-column: span 4; }
.col-5 { grid-column: span 5; }
.col-6 { grid-column: span 6; }
.col-7 { grid-column: span 7; }
.col-8 { grid-column: span 8; }
.col-9 { grid-column: span 9; }
.col-12 { grid-column: span 12; }

.rule-line { height: 1px; background: var(--grid-line); width: 100%; border: 0; }
.angle-line {
  height: 1px;
  width: min(320px, 60%);
  background: linear-gradient(90deg, var(--accent), transparent);
  transform: rotate(-12deg);
  transform-origin: left center;
}

.btn {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  padding: 14px 22px;
  border: 1px solid var(--grid-line);
  background: transparent;
  color: var(--text);
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.06em;
  cursor: pointer;
  transition: transform var(--dur-2) var(--ease), background var(--dur-2) var(--ease), color var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease);
}
.btn::after { content: "→"; font-family: var(--font-mono); }
.btn:hover { transform: translateY(-2px); }
.btn--primary { background: var(--accent); border-color: var(--accent); color: var(--ink); }
.btn--primary:hover { background: var(--accent-soft); border-color: var(--accent-soft); }
.btn--signal { background: var(--signal); border-color: var(--signal); color: var(--ink); }
.btn--signal:hover { background: var(--signal-soft); border-color: var(--signal-soft); }
.btn--ghost { background: var(--plate-bg); }
.btn--ghost:hover { border-color: var(--accent); color: var(--accent); }

.breadcrumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}
.breadcrumbs li { display: inline-flex; align-items: center; gap: 10px; }
.breadcrumbs li + li::before { content: "/"; color: var(--grid-line); }
.breadcrumbs a:hover { color: var(--accent); }
.breadcrumbs [aria-current="page"] { color: var(--text); }

.img-frame {
  position: relative;
  display: block;
  border: 1px solid var(--grid-line);
  background: linear-gradient(140deg, var(--ink-2), var(--ink-3));
  overflow: hidden;
}
.img-frame::before {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(var(--accent-rgb), 0.14), transparent 58%);
  pointer-events: none;
}
.img-frame::after {
  content: "";
  position: absolute;
  left: -10%;
  bottom: 0;
  width: 46%;
  height: 1px;
  background: linear-gradient(90deg, var(--signal), transparent);
  transform: rotate(-12deg);
  transform-origin: left center;
  pointer-events: none;
}
.img-frame__media {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: var(--frame-ratio, 16 / 9);
  object-fit: cover;
}
.img-frame__caption {
  position: relative;
  padding: 10px 14px;
  border-top: 1px solid var(--grid-line);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--muted);
  background: rgba(10, 15, 26, 0.6);
}

.expand { border: 1px solid var(--grid-line); background: var(--band-echo); }
.expand__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 20px;
  appearance: none;
  background: transparent;
  border: 0;
  padding: 18px 20px;
  text-align: left;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 16px;
  letter-spacing: 0.03em;
  color: var(--text);
  cursor: pointer;
  transition: color var(--dur-2) var(--ease);
}
.expand__trigger::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--accent);
  transition: transform var(--dur-2) var(--ease);
}
.expand__trigger:hover { color: var(--accent); }
.expand[data-open="true"] .expand__trigger::after { transform: rotate(45deg); }
.expand__panel {
  display: grid;
  grid-template-rows: 0fr;
  opacity: 0;
  transition: grid-template-rows var(--dur-3) var(--ease), opacity var(--dur-2) var(--ease);
}
.expand[data-open="true"] .expand__panel { grid-template-rows: 1fr; opacity: 1; }
.expand__inner { overflow: hidden; min-height: 0; }
.expand__body { padding: 0 20px 22px; max-width: var(--read); color: var(--muted); font-size: 16px; }

.back-to-top {
  position: fixed;
  right: clamp(16px, 3vw, 32px);
  bottom: clamp(16px, 3vw, 32px);
  z-index: 70;
  appearance: none;
  border: 1px solid var(--grid-line);
  background: var(--ink-2);
  color: var(--text);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  padding: 12px 14px;
  cursor: pointer;
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--dur-2) var(--ease), visibility var(--dur-2) var(--ease), border-color var(--dur-2) var(--ease), color var(--dur-2) var(--ease);
}
.back-to-top[data-visible="true"] { opacity: 1; visibility: visible; pointer-events: auto; }
.back-to-top:hover { border-color: var(--signal); color: var(--signal); }

/* ---------- 8. 显现动效 ---------- */
[data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity var(--dur-3) var(--ease), transform var(--dur-3) var(--ease);
}
[data-reveal].is-visible { opacity: 1; transform: none; }

/* ---------- 9. 响应式 ---------- */
@media (max-width: 1080px) {
  .site-footer__inner { grid-template-columns: minmax(0, 1fr); }
  .site-footer__summary { max-width: 60ch; }
}

@media (max-width: 899px) {
  body { font-size: 16px; background-size: 48px 48px, 48px 48px; }

  .site-header__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    grid-template-areas:
      "brand toggle"
      "quick quick"
      "nav nav";
    gap: 12px 16px;
    padding: 14px var(--pad) 12px;
    align-items: center;
  }
  .nav-toggle { display: inline-flex; }
  .site-nav {
    display: none;
    justify-self: stretch;
    max-width: none;
  }
  .site-header[data-open="true"] .site-nav { display: block; }
  .site-nav__list {
    flex-direction: column;
    align-items: stretch;
    justify-content: flex-start;
    gap: 0;
    width: 100%;
    padding-top: 6px;
    border-top: 1px solid var(--grid-line);
  }
  .site-nav__link {
    width: 100%;
    padding: 14px 2px;
    border-bottom: 1px solid var(--grid-line);
    font-size: 16px;
    color: var(--text);
  }
  .site-nav__link::after { display: none; }
  .site-nav__link[aria-current="page"] { color: var(--accent); }

  .quick-entry { justify-content: flex-start; gap: 8px 10px; }
  .quick-entry__label { width: 100%; }

  .col-3, .col-4, .col-5, .col-6, .col-7, .col-8, .col-9 { grid-column: span 12; }
  .site-footer__nav { grid-template-columns: minmax(0, 1fr); gap: 28px; }
}

@media (max-width: 560px) {
  .brand__sub { display: none; }
  .version-switch__btn { padding: 7px 9px; font-size: 11px; }
  .site-footer__meta { flex-direction: column; }
  .contact-line { grid-template-columns: 46px minmax(0, 1fr); }
  .contact-line .copy-btn { grid-column: 2; justify-self: start; }
}

/* ---------- 10. 可访问性偏好 ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .expand__panel { transition: none; }
  .btn:hover, .quick-entry__link:hover, .footer-col__list a:hover { transform: none; }
}