/* ============================================================
   开云体育 · 中国区站点 共享样式 /assets/site.css
   夜蓝底 + 天山雪青 + 开云暖金单强调色
   ============================================================ */

/* ---------- reset ---------- */
*, *::before, *::after { box-sizing: border-box; }
html { -webkit-text-size-adjust: 100%; scroll-behavior: smooth; }
body { margin: 0; }
img, svg, picture { max-width: 100%; display: block; }
ul, ol { margin: 0; padding: 0; list-style: none; }
p, h1, h2, h3, h4, figure { margin: 0; }
a { color: inherit; text-decoration: none; }
button { font: inherit; color: inherit; background: none; border: 0; padding: 0; cursor: pointer; }
table { border-collapse: collapse; width: 100%; }
[hidden] { display: none !important; }

/* ---------- tokens ---------- */
:root {
  --ink-900: #071A2B;
  --ink-800: #102C43;
  --ink-700: #1B4159;
  --cyan-600: #4E7C8A;
  --cyan-200: #B9D6DC;
  --paper: #F2F6F7;
  --gold: #E2A33C;
  --up: #2FB8A0;
  --down: #E4572E;
  --muted: #8A94A0;

  --radius-lg: 28px;
  --radius-md: 20px;
  --radius-sm: 12px;
  --pill: 999px;

  --maxw: 1280px;
  --rail: 320px;
  --gutter: 24px;

  --sans: "PingFang SC", "Microsoft YaHei", "Source Han Sans SC", "Noto Sans SC", system-ui, -apple-system, "Segoe UI", sans-serif;
  --mono: "IBM Plex Mono", "JetBrains Mono", ui-monospace, SFMono-Regular, Menlo, Consolas, "Courier New", monospace;
}

/* ---------- base typography ---------- */
body {
  background-color: var(--ink-900);
  color: var(--cyan-200);
  font-family: var(--sans);
  font-size: 16px;
  line-height: 1.75;
  font-weight: 400;
  -webkit-font-smoothing: antialiased;
}
h1, h2, h3 { color: var(--paper); font-weight: 900; letter-spacing: -0.02em; line-height: 1.25; }
h1 { font-size: clamp(40px, 6vw, 56px); }
h2 { font-size: clamp(26px, 3.6vw, 32px); }
h3 { font-size: 19px; letter-spacing: -0.01em; }
.mono { font-family: var(--mono); font-variant-numeric: tabular-nums; letter-spacing: 0.06em; }
.muted { color: var(--muted); }
.eyebrow {
  font-family: var(--mono); font-size: 13px; letter-spacing: 0.14em;
  text-transform: uppercase; color: var(--gold);
}
.visually-hidden {
  position: absolute !important; width: 1px; height: 1px; overflow: hidden;
  clip: rect(0 0 0 0); clip-path: inset(50%); white-space: nowrap;
}

/* ---------- layout ---------- */
.container {
  width: 100%; max-width: var(--maxw);
  margin-inline: auto; padding-inline: var(--gutter);
}
main { display: block; }
#main-content { display: block; }
.section { padding: 72px 0; }
.section--paper { background-color: var(--paper); color: var(--ink-800); }
.section--paper h1, .section--paper h2, .section--paper h3 { color: var(--ink-900); }
.section-head { display: flex; flex-wrap: wrap; align-items: baseline; gap: 12px 20px; margin-bottom: 28px; }
.grid { display: grid; grid-template-columns: repeat(12, minmax(0, 1fr)); gap: var(--gutter); }
.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-8 { grid-column: span 8; }
.col-12 { grid-column: span 12; }
.split { display: grid; grid-template-columns: var(--rail) minmax(0, 1fr); gap: 48px; align-items: start; }
.rail { position: sticky; top: 132px; }

/* ---------- buttons ---------- */
.btn {
  display: inline-flex; align-items: center; justify-content: center; gap: 8px;
  padding: 11px 20px; border-radius: var(--pill);
  font-size: 14px; font-weight: 600; letter-spacing: 0.03em;
  border: 1px solid transparent; white-space: nowrap;
  transition: background-color .18s ease, color .18s ease, border-color .18s ease, transform .18s ease;
}
.btn--primary { background-color: var(--gold); color: var(--ink-900); }
.btn--primary:hover { background-color: #F0B45A; }
.btn--ghost { border-color: var(--ink-700); color: var(--cyan-200); }
.btn--ghost:hover { border-color: var(--cyan-600); color: var(--paper); background-color: rgba(78, 124, 138, .16); }
.btn--block { display: flex; width: 100%; }
.btn--small { padding: 8px 14px; font-size: 13px; }
.btn:active { transform: translateY(1px); }

/* ---------- skip link ---------- */
.skip-link {
  position: absolute; left: 16px; top: -72px; z-index: 300;
  padding: 10px 18px; border-radius: var(--pill);
  background-color: var(--gold); color: var(--ink-900);
  font-size: 14px; font-weight: 700;
  transition: top .2s ease;
}
.skip-link:focus { top: 12px; }

/* ---------- header ---------- */
.site-header {
  position: sticky; top: 0; z-index: 120;
  background-color: rgba(7, 26, 43, .96);
  backdrop-filter: blur(12px);
  border-bottom: 1px solid var(--ink-700);
}
.header-top {
  border-bottom: 1px solid rgba(27, 65, 89, .8);
  overflow: hidden;
}
.header-top__inner {
  display: flex; align-items: center; gap: 20px;
  min-height: 44px; padding-block: 6px;
  font-size: 13px; letter-spacing: 0.04em;
}
.brand { display: inline-flex; align-items: baseline; gap: 10px; flex: 0 0 auto; }
.brand__name { font-size: 17px; font-weight: 900; letter-spacing: -0.01em; color: var(--paper); }
.brand__suffix {
  font-size: 12px; letter-spacing: 0.08em; color: var(--cyan-600);
  border: 1px solid var(--ink-700); border-radius: var(--pill); padding: 2px 10px;
}
.brand__line {
  color: var(--cyan-200); white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.header-top__meta {
  margin-left: auto; display: flex; align-items: center; gap: 12px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em; color: var(--muted);
}
.meta-pill {
  border: 1px solid var(--ink-700); border-radius: var(--pill);
  padding: 3px 10px; color: var(--cyan-200);
}
.header-nav-bar__inner {
  display: flex; align-items: center; gap: 20px; min-height: 60px;
}
.nav { display: flex; align-items: center; gap: 8px; min-width: 0; }
.nav__list { display: flex; align-items: center; gap: 4px; }
.nav__link {
  position: relative; display: inline-block;
  padding: 10px 12px; border-radius: var(--pill);
  font-size: 14px; letter-spacing: 0.04em; color: var(--cyan-200);
  transition: color .18s ease, background-color .18s ease;
}
.nav__link:hover { color: var(--paper); background-color: rgba(27, 65, 89, .75); }
.nav__link[aria-current="page"] { color: var(--paper); }
.nav__link[aria-current="page"]::after {
  content: ""; position: absolute; left: 12px; right: 12px; bottom: 2px;
  height: 2px; border-radius: 2px; background-color: var(--gold);
}
.nav__index, .nav__extra { display: none; }
.header-actions { margin-left: auto; display: flex; gap: 10px; }
.nav-toggle {
  display: none; align-items: center; gap: 9px; margin-left: auto;
  padding: 9px 15px; border-radius: var(--pill);
  border: 1px solid var(--ink-700); color: var(--cyan-200);
  font-size: 13px; letter-spacing: 0.06em;
}
.nav-toggle__bars {
  position: relative; width: 18px; height: 2px; border-radius: 2px; background-color: currentColor;
  transition: background-color .18s ease;
}
.nav-toggle__bars::before, .nav-toggle__bars::after {
  content: ""; position: absolute; left: 0; width: 18px; height: 2px;
  border-radius: 2px; background-color: currentColor;
  transition: transform .2s ease, top .2s ease;
}
.nav-toggle__bars::before { top: -6px; }
.nav-toggle__bars::after { top: 6px; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars { background-color: transparent; }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before { top: 0; transform: rotate(45deg); }
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after { top: 0; transform: rotate(-45deg); }
.nav-scrim { display: none; }

/* ---------- footer ---------- */
.site-footer {
  margin-top: 80px;
  background-color: var(--ink-900);
  border-top: 1px solid var(--ink-700);
  color: var(--cyan-200);
}
.index-bar {
  background-color: var(--ink-800);
  background-image: linear-gradient(180deg, rgba(226, 163, 60, .10), rgba(226, 163, 60, 0) 70%);
  border-bottom: 1px solid var(--ink-700);
}
.index-bar__inner { padding: 18px 0 16px; }
.index-bar__head { display: flex; align-items: center; gap: 16px; margin-bottom: 14px; }
.index-bar__title {
  font-size: 15px; font-weight: 900; color: var(--paper); letter-spacing: 0.02em;
}
.index-bar__title .mono { font-size: 12px; color: var(--gold); margin-right: 8px; letter-spacing: 0.16em; }
.index-toggle {
  margin-left: auto; display: inline-flex; align-items: center; gap: 8px;
  padding: 7px 14px; border-radius: var(--pill);
  border: 1px solid var(--ink-700); color: var(--cyan-200);
  font-size: 13px; letter-spacing: 0.05em;
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}
.index-toggle:hover { border-color: var(--gold); color: var(--gold); background-color: rgba(226, 163, 60, .10); }
.index-toggle__caret {
  width: 7px; height: 7px; border-right: 2px solid currentColor; border-bottom: 2px solid currentColor;
  transform: rotate(45deg) translateY(-2px); transition: transform .2s ease;
}
.index-toggle[aria-expanded="true"] .index-toggle__caret { transform: rotate(-135deg) translateY(-2px); }
.index-track {
  display: flex; align-items: center; gap: 10px;
  overflow-x: auto; padding-bottom: 6px;
  scrollbar-width: thin; scroll-snap-type: x proximity;
}
.index-track::-webkit-scrollbar { height: 6px; }
.index-track::-webkit-scrollbar-thumb { background-color: var(--ink-700); border-radius: var(--pill); }
.index-panel {
  margin-top: 14px; padding-top: 16px;
  border-top: 1px dashed var(--ink-700);
}
.index-panel__label { font-size: 12px; letter-spacing: 0.16em; color: var(--cyan-600); margin-bottom: 10px; }
.chip {
  flex: 0 0 auto; display: inline-flex; align-items: center; gap: 8px;
  padding: 8px 14px; border-radius: var(--pill);
  border: 1px solid var(--ink-700); background-color: rgba(7, 26, 43, .55);
  color: var(--cyan-200); font-size: 13px; letter-spacing: 0.04em; white-space: nowrap;
  scroll-snap-align: start;
  transition: border-color .18s ease, color .18s ease, background-color .18s ease;
}
.chip:hover { border-color: var(--cyan-600); color: var(--paper); background-color: rgba(27, 65, 89, .8); }
.chip--accent { border-color: rgba(226, 163, 60, .55); color: var(--gold); }
.chip--accent:hover { border-color: var(--gold); background-color: rgba(226, 163, 60, .16); color: var(--gold); }
.chip--up { border-color: rgba(47, 184, 160, .45); color: var(--up); }
.chip--up:hover { border-color: var(--up); background-color: rgba(47, 184, 160, .14); color: var(--up); }
.chip--down { border-color: rgba(228, 87, 46, .45); color: var(--down); }
.chip--down:hover { border-color: var(--down); background-color: rgba(228, 87, 46, .14); color: var(--down); }

.footer-main { padding: 56px 0 40px; }
.footer-main__inner { display: grid; gap: 36px; grid-template-columns: minmax(0, 1fr); }
.footer-brand__name { font-size: 22px; font-weight: 900; color: var(--paper); letter-spacing: -0.01em; }
.footer-brand__suffix {
  margin-top: 6px; font-family: var(--mono); font-size: 12px;
  letter-spacing: 0.08em; color: var(--cyan-600);
}
.footer-brand__note { margin-top: 14px; font-size: 14px; color: var(--cyan-200); max-width: 34ch; }
.footer-col__title {
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.16em;
  text-transform: uppercase; color: var(--cyan-600); margin-bottom: 12px;
}
.footer-col__list { display: grid; gap: 2px; }
.footer-link {
  position: relative; display: inline-block; padding: 6px 0;
  font-size: 14px; color: var(--cyan-200);
  transition: color .18s ease, padding-left .18s ease;
}
.footer-link::before {
  content: ""; position: absolute; left: 0; top: 50%; width: 0; height: 2px;
  border-radius: 2px; background-color: var(--gold);
  transform: translateY(-50%); transition: width .18s ease;
}
.footer-link:hover { color: var(--paper); padding-left: 14px; }
.footer-link:hover::before { width: 8px; }
.footer-contact__item { font-size: 14px; padding: 5px 0; word-break: break-word; }
.footer-contact__item .mono {
  display: inline-block; min-width: 44px; margin-right: 10px;
  font-size: 12px; letter-spacing: 0.14em; color: var(--cyan-600);
}
.footer-contact__note { margin-top: 12px; font-size: 13px; color: var(--muted); max-width: 40ch; }
.footer-bottom { border-top: 1px solid var(--ink-700); }
.footer-bottom__inner {
  display: flex; flex-wrap: wrap; align-items: center; gap: 12px 24px;
  padding: 18px 0 28px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.05em; color: var(--muted);
}
.footer-legal { color: var(--cyan-600); }
.footer-bottom__links { display: flex; flex-wrap: wrap; gap: 18px; margin-left: auto; }
.footer-bottom__links .footer-link { font-size: 12px; color: var(--muted); }
.footer-bottom__links .footer-link:hover { color: var(--paper); }
.footer-copy { color: var(--muted); }

/* ---------- breadcrumbs ---------- */
.breadcrumbs { padding: 20px 0 4px; }
.breadcrumbs__list {
  display: flex; flex-wrap: wrap; align-items: center; gap: 8px;
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; color: var(--muted);
}
.breadcrumbs__item { display: inline-flex; align-items: center; gap: 8px; }
.breadcrumbs__item:not(:first-child)::before { content: "/"; color: var(--cyan-600); opacity: .7; }
.breadcrumbs__link { color: var(--cyan-200); }
.breadcrumbs__link:hover { color: var(--gold); }
.breadcrumbs__item[aria-current="page"] { color: var(--paper); }

/* ---------- cards ---------- */
.card {
  background-color: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-radius: var(--radius-lg);
  padding: 24px;
}
.card--paper { background-color: var(--paper); border-color: transparent; color: var(--ink-800); }
.card--paper .card__title { color: var(--ink-900); }
.card--flush { padding: 0; overflow: hidden; }
.card__title { font-size: 19px; font-weight: 800; color: var(--paper); letter-spacing: -0.01em; }

/* ---------- media frame (页面阶段放图占位) ---------- */
.media-frame {
  position: relative; overflow: hidden;
  border-radius: var(--radius-md);
  aspect-ratio: 16 / 9;
  background-color: var(--ink-800);
  background-image:
    radial-gradient(120% 120% at 18% 0%, rgba(226, 163, 60, .22), rgba(7, 26, 43, 0) 62%),
    linear-gradient(160deg, var(--ink-700), var(--ink-900));
}
.media-frame > img,
.media-frame > picture > img,
.media-frame > video { 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; }
.media-frame__caption {
  position: absolute; left: 16px; bottom: 16px;
  padding: 6px 12px; border-radius: var(--pill);
  background-color: rgba(7, 26, 43, .74);
  font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; color: var(--cyan-200);
}

/* ---------- delta bar（积分差异条） ---------- */
.delta { display: flex; align-items: center; gap: 12px; }
.delta__track {
  position: relative; flex: 1 1 auto; height: 8px; min-width: 60px;
  border-radius: var(--pill); background-color: var(--ink-700); overflow: hidden;
}
.delta__bar {
  display: block; height: 100%; width: 0;
  border-radius: var(--pill); background-color: var(--up);
  transition: width .24s ease-out;
}
.delta--down .delta__bar { background-color: var(--down); }
.delta__value { font-family: var(--mono); font-size: 13px; letter-spacing: 0.06em; color: var(--up); }
.delta--down .delta__value { color: var(--down); }

/* ---------- 左侧索引轨道 ---------- */
.index-rail__list { display: grid; gap: 4px; }
.index-rail__link {
  display: flex; align-items: baseline; gap: 10px;
  padding: 10px 14px; border-radius: var(--radius-sm);
  border-left: 2px solid transparent;
  font-size: 14px; color: var(--cyan-200);
  transition: color .18s ease, background-color .18s ease, border-color .18s ease;
}
.index-rail__link .mono { font-size: 12px; color: var(--cyan-600); }
.index-rail__link:hover { color: var(--paper); background-color: rgba(27, 65, 89, .6); }
.index-rail__link[aria-current="true"] {
  color: var(--paper); border-left-color: var(--gold); background-color: rgba(226, 163, 60, .10);
}

/* ---------- 滚动进度条 ---------- */
.read-progress {
  position: fixed; top: 0; left: 0; right: 0; height: 2px; z-index: 200;
  background-color: rgba(27, 65, 89, .65); pointer-events: none;
}
.read-progress__bar {
  display: block; width: 0; height: 100%;
  background-color: var(--gold); transition: width .1s linear;
}

/* ---------- 入场显现 ---------- */
[data-reveal] {
  opacity: 0; transform: translateY(8px);
  transition: opacity .12s ease-out, transform .12s ease-out;
  transition-delay: var(--reveal-delay, 0ms);
}
[data-reveal][data-revealed] { opacity: 1; transform: none; }

/* ---------- focus ---------- */
:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: 2px;
  border-radius: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .footer-main__inner { grid-template-columns: repeat(2, minmax(0, 1fr)); }
}
@media (min-width: 1080px) {
  .footer-main__inner {
    grid-template-columns: minmax(0, 1.5fr) repeat(3, minmax(0, 1fr)) minmax(0, 1.3fr);
    gap: 44px;
  }
}
@media (min-width: 900px) {
  .header-top {
    max-height: 84px; opacity: 1;
    transition: max-height .28s ease, opacity .2s ease, border-color .28s ease;
  }
  .site-header[data-scrolled] .header-top {
    max-height: 0; opacity: 0; border-color: transparent;
  }
}
@media (max-width: 1023px) {
  .split { grid-template-columns: minmax(0, 1fr); gap: 32px; }
  .rail { position: static; }
}
@media (max-width: 899px) {
  .header-actions { display: none; }
  .nav-toggle { display: inline-flex; }
  .nav {
    position: fixed; top: 0; left: 0; bottom: 0; z-index: 140;
    width: min(340px, 86vw);
    flex-direction: column; align-items: stretch; gap: 0;
    padding: 22px 20px 32px;
    background-color: var(--ink-800);
    border-right: 1px solid var(--ink-700);
    overflow-y: auto;
    transform: translateX(-104%);
    transition: transform .28s cubic-bezier(.4, 0, .2, 1);
  }
  .nav[data-open] { transform: none; }
  .nav__index {
    display: flex; flex-direction: column; gap: 2px;
    padding: 14px 16px; margin-bottom: 16px;
    border: 1px solid var(--ink-700); border-radius: var(--radius-md);
    background-color: var(--ink-900);
  }
  .nav__index-title { font-size: 16px; font-weight: 900; color: var(--paper); }
  .nav__index-note { font-family: var(--mono); font-size: 12px; letter-spacing: 0.06em; color: var(--muted); }
  .nav__list { flex-direction: column; align-items: stretch; gap: 2px; }
  .nav__link { display: block; padding: 12px 14px; border-radius: var(--radius-sm); font-size: 15px; }
  .nav__link[aria-current="page"] { background-color: rgba(226, 163, 60, .12); }
  .nav__link[aria-current="page"]::after { display: none; }
  .nav__extra { display: flex; flex-direction: column; gap: 10px; margin-top: 24px; }
  .nav-scrim {
    position: fixed; inset: 0; z-index: 130;
    background-color: rgba(4, 14, 24, .62);
  }
  .site-header[data-nav-open] .nav-scrim { display: block; }
  .col-3, .col-4, .col-5, .col-6, .col-8 { grid-column: span 12; }
  .section { padding: 52px 0; }
  .site-footer { margin-top: 56px; }
}
@media (max-width: 639px) {
  .brand__line { display: none; }
  .header-top__meta .meta-item { display: none; }
  .header-top__inner { gap: 12px; }
  .footer-bottom__links { margin-left: 0; }
}

/* ---------- reduced motion ---------- */
@media (prefers-reduced-motion: reduce) {
  html { scroll-behavior: auto; }
  *, *::before, *::after {
    animation-duration: .01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: .01ms !important;
    transition-delay: 0ms !important;
  }
  [data-reveal] { opacity: 1; transform: none; }
  .read-progress__bar { transition: none; }
}