/* ============================================================
   BSPORTS 赛场 · /assets/site.css
   共享层：设计令牌 / reset / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink-900:#050B18;
  --ink-700:#0B1B33;
  --stone:#2A3442;
  --moss:#5F7D63;
  --clay:#B96A4B;
  --paper:#F3EDE2;
  --lime:#74F7A6;
  --orange:#FF7A3D;
  --ice:#9BC4FF;
  --void:#01040A;

  --paper-82:rgba(243,237,226,.82);
  --paper-70:rgba(243,237,226,.70);
  --paper-55:rgba(243,237,226,.55);
  --line:rgba(42,52,66,.85);

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

  --ease:cubic-bezier(.22,.61,.36,1);
  --radius-pill:999px;
  --radius-card:16px;
  --shell-max:1240px;
}

/* ---------- 2. reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse}
:focus-visible{outline:2px solid var(--lime);outline-offset:3px;border-radius:4px}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100vh;
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1100px 620px at 12% -12%, rgba(116,247,166,.12), transparent 62%),
    radial-gradient(900px 520px at 88% -6%, rgba(155,196,255,.10), transparent 66%),
    radial-gradient(700px 480px at 60% 110%, rgba(185,106,75,.10), transparent 70%);
  background-repeat:no-repeat;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.5;
  background-image:
    linear-gradient(rgba(155,196,255,.055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(155,196,255,.055) 1px, transparent 1px);
  background-size:84px 84px;
  -webkit-mask-image:radial-gradient(120% 78% at 50% 0%, #000 28%, transparent 86%);
  mask-image:radial-gradient(120% 78% at 50% 0%, #000 28%, transparent 86%);
}
main{display:block}
#main-content{scroll-margin-top:110px}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.12;
  letter-spacing:-.02em;
  color:var(--paper);
  text-wrap:balance;
}
h1{font-size:clamp(2rem,5.4vw,3.75rem)}
h2{font-size:clamp(1.5rem,3.2vw,2.25rem)}
h3{font-size:clamp(1.125rem,2vw,1.4rem)}
p{max-width:70ch}
strong{font-weight:700;color:var(--paper)}
.num,time,code{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

/* ---------- 4. 工具类 ---------- */
.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;
}
.container{width:100%;max-width:1120px;margin-inline:auto;padding-inline:clamp(16px,3vw,28px)}
.container--wide{max-width:var(--shell-max)}
.section{padding-block:clamp(40px,7vw,80px)}
.section--tight{padding-block:clamp(24px,4vw,40px)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:11.5px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--lime);
}
.eyebrow::before{content:"";width:22px;height:1px;background:var(--lime);opacity:.75}
.section-title{font-size:clamp(1.5rem,3.2vw,2.2rem)}
.lede{font-size:clamp(1rem,1.6vw,1.125rem);line-height:1.85;color:var(--paper-70);max-width:62ch}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(260px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(210px,1fr))}
.split{display:grid;gap:clamp(20px,3vw,40px);grid-template-columns:1fr}
.split--even{grid-template-columns:1fr}

/* ---------- 5. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:9px;
  padding:12px 22px;border-radius:var(--radius-pill);border:1px solid transparent;
  font-size:14.5px;font-weight:700;letter-spacing:.02em;
  transition:transform .18s var(--ease),background .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--orange);color:#170900;box-shadow:0 16px 30px -18px rgba(255,122,61,.95)}
.btn--primary:hover{background:#ff8d5c}
.btn--ghost{border-color:var(--stone);background:rgba(42,52,66,.28);color:var(--paper)}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime)}
.btn--quiet{padding:10px 4px;border-radius:8px;color:var(--ice)}
.btn--quiet:hover{color:var(--lime);transform:none}

/* ---------- 6. 标签 / 卡片 / 指标 ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border-radius:var(--radius-pill);border:1px solid currentColor;
  font-family:var(--font-mono);font-size:11px;font-weight:600;letter-spacing:.1em;
  line-height:1.6;text-transform:uppercase;
}
.tag--lime{color:var(--lime);background:rgba(116,247,166,.08);border-color:rgba(116,247,166,.42)}
.tag--clay{color:#e79a7a;background:rgba(185,106,75,.16);border-color:rgba(185,106,75,.62)}
.tag--moss{color:#9dbf9f;background:rgba(95,125,99,.2);border-color:rgba(95,125,99,.7)}
.tag--ice{color:var(--ice);background:rgba(155,196,255,.08);border-color:rgba(155,196,255,.45)}

.card{
  position:relative;
  padding:clamp(18px,2.4vw,26px);
  border:1px solid var(--stone);
  border-radius:var(--radius-card);
  background:linear-gradient(180deg,rgba(11,27,51,.94),rgba(5,11,24,.94));
  box-shadow:0 30px 52px -42px #000;
}
.card--paper{background:var(--paper);border-color:rgba(11,27,51,.14);color:#0b1521}
.card--paper .card-title,.card--paper h3{color:#0b1521}
.card-title{font-size:1.05rem;font-weight:800;letter-spacing:-.01em}
.card-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--ice);
}

.stat{display:grid;gap:4px}
.stat-value{
  font-family:var(--font-mono);font-weight:700;line-height:1;
  font-size:clamp(2rem,4.5vw,3.25rem);letter-spacing:-.02em;color:var(--lime);
}
.stat-unit{font-size:.42em;margin-left:4px;color:var(--paper-55)}
.stat-label{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--paper-55);
}

/* ---------- 7. 表格 / 时间线 / 图片容器 ---------- */
.table-wrap{
  overflow-x:auto;
  border:1px solid var(--stone);
  border-radius:14px;
  background:rgba(5,11,24,.62);
}
.data-table{width:100%;min-width:520px;font-size:14px}
.data-table th,.data-table td{padding:12px 14px;text-align:left;border-bottom:1px solid rgba(42,52,66,.72)}
.data-table thead th{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;text-transform:uppercase;
  color:var(--ice);background:rgba(11,27,51,.92);white-space:nowrap;
}
.data-table tbody tr:last-child td{border-bottom:0}
.data-table tbody tr:hover{background:rgba(116,247,166,.06)}
.data-table td.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;color:var(--paper)}

.timeline{position:relative;display:grid;gap:20px;padding-left:22px}
.timeline::before{
  content:"";position:absolute;left:5px;top:8px;bottom:8px;width:1px;
  background:linear-gradient(180deg,var(--moss),rgba(42,52,66,.25));
}
.timeline-item{position:relative}
.timeline-node{
  position:absolute;left:-22px;top:9px;width:11px;height:11px;border-radius:50%;
  background:var(--ink-900);border:2px solid var(--moss);
  transition:border-color .2s var(--ease),box-shadow .2s var(--ease);
}
.timeline-item:hover .timeline-node{border-color:var(--lime);box-shadow:0 0 0 5px rgba(116,247,166,.18)}
.timeline-time{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--ice)}

.media-frame{
  position:relative;overflow:hidden;isolation:isolate;
  border:1px solid var(--stone);border-radius:var(--radius-card);
  background:linear-gradient(135deg,var(--ink-700),var(--ink-900));
  aspect-ratio:16/9;
}
.media-frame img{width:100%;height:100%;object-fit:cover;filter:saturate(.92) contrast(1.08) brightness(.82)}
.media-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(180deg,rgba(1,4,10,.12),rgba(1,4,10,.74)),
    repeating-linear-gradient(0deg,rgba(116,247,166,.09) 0 1px,transparent 1px 46px);
  opacity:.75;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame-caption{
  margin-top:10px;font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--paper-55);
}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{
  padding-top:clamp(20px,3vw,32px);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.06em;color:var(--paper-55);
}
.breadcrumb-list{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.breadcrumb-list li:not(:last-child)::after{content:"/";margin-left:8px;color:rgba(155,196,255,.35)}
.breadcrumb-link{color:var(--paper-70);transition:color .18s var(--ease)}
.breadcrumb-link:hover{color:var(--lime)}
.breadcrumb-current{color:var(--lime)}

/* ---------- 9. 分段切换 ---------- */
.tablist{
  display:inline-flex;flex-wrap:wrap;gap:6px;padding:6px;
  border:1px solid var(--stone);border-radius:var(--radius-pill);
  background:rgba(11,27,51,.78);
}
.tab{
  padding:8px 16px;border-radius:var(--radius-pill);
  font-size:13.5px;font-weight:700;color:var(--paper-70);
  transition:background .18s var(--ease),color .18s var(--ease);
}
.tab:hover{color:var(--paper);background:rgba(155,196,255,.1)}
.tab[aria-selected="true"]{background:var(--lime);color:#04140a}
.tabpanel{padding-top:20px}
.tabpanel[hidden]{display:none}

/* ---------- 10. 动效与进度 ---------- */
[data-reveal]{transition:opacity .45s var(--ease),transform .45s var(--ease)}
.reveal-ready [data-reveal]{opacity:0;transform:translateY(12px)}
.reveal-ready [data-reveal].is-visible{opacity:1;transform:none}

.scroll-progress{
  position:fixed;top:0;left:0;z-index:120;
  width:0;height:2px;pointer-events:none;
  background:linear-gradient(90deg,var(--lime),var(--ice));
  box-shadow:0 0 12px rgba(116,247,166,.75);
}

/* ---------- 11. 头部 ---------- */
.skip-link{
  position:absolute;left:50%;top:0;z-index:200;
  transform:translate(-50%,-160%);
  padding:10px 18px;border-radius:0 0 12px 12px;
  background:var(--lime);color:#04140a;font-size:14px;font-weight:800;
  transition:transform .18s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translate(-50%,0)}

.site-header{
  position:sticky;top:0;z-index:80;
  padding:12px clamp(10px,2.4vw,28px) 0;
  transition:padding-top .22s var(--ease);
}
.site-header[data-scrolled]{padding-top:5px}

.header-shell{
  max-width:var(--shell-max);margin-inline:auto;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 16px;
  padding:10px 12px 10px 14px;
  border:1px solid var(--stone);border-radius:18px;
  background:linear-gradient(180deg,rgba(11,27,51,.95),rgba(5,11,24,.93));
  box-shadow:0 26px 50px -36px #000,inset 0 1px 0 rgba(243,237,226,.06);
  -webkit-backdrop-filter:blur(16px) saturate(130%);
  backdrop-filter:blur(16px) saturate(130%);
  transition:padding .22s var(--ease),border-radius .22s var(--ease),background .22s var(--ease);
}

.brand{display:inline-flex;align-items:center;gap:11px;min-width:0}
.brand-mark{
  flex:none;display:grid;place-items:center;width:38px;height:38px;border-radius:11px;
  font-family:var(--font-mono);font-size:13px;font-weight:700;letter-spacing:.06em;
  color:#04140a;
  background:linear-gradient(135deg,var(--lime) 0%,#38d68d 52%,var(--ice) 100%);
  box-shadow:0 0 0 1px rgba(116,247,166,.35),0 12px 22px -16px rgba(116,247,166,.95);
}
.brand-text{display:flex;flex-direction:column;line-height:1.18;min-width:0}
.brand-name{font-size:16px;font-weight:800;letter-spacing:.01em;color:var(--paper);white-space:nowrap}
.brand-tag{
  display:none;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.07em;
  color:rgba(155,196,255,.72);white-space:nowrap;
}

.nav-toggle{
  display:inline-flex;align-items:center;gap:9px;
  padding:9px 13px;border-radius:12px;
  border:1px solid var(--stone);background:rgba(42,52,66,.35);color:var(--paper);
  transition:border-color .18s var(--ease),background .18s var(--ease);
}
.nav-toggle:hover{border-color:rgba(116,247,166,.6)}
.nav-toggle-icon{display:grid;gap:4px;width:16px}
.nav-toggle-bar{
  display:block;width:16px;height:2px;border-radius:2px;background:var(--lime);
  transition:transform .2s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:first-child{transform:translateY(3px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bar:last-child{transform:translateY(-3px) rotate(-45deg)}
.nav-toggle-label{font-size:12px;font-weight:700;letter-spacing:.1em;font-family:var(--font-mono)}

.primary-nav{
  display:none;flex-basis:100%;width:100%;
  padding-top:10px;margin-top:4px;border-top:1px solid rgba(42,52,66,.9);
}
.primary-nav[data-open]{display:block}

.nav-list{display:flex;flex-direction:column;gap:2px;width:100%}
.nav-link{
  position:relative;display:block;
  padding:11px 14px;border-radius:12px;
  font-size:14px;font-weight:600;letter-spacing:.02em;color:var(--paper-82);
  transition:color .18s var(--ease),background .18s var(--ease);
}
.nav-link:hover{color:var(--paper);background:rgba(155,196,255,.1)}
.nav-link[aria-current="page"]{color:var(--lime)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:14px;bottom:5px;width:16px;height:2px;border-radius:2px;
  background:var(--lime);box-shadow:0 0 12px rgba(116,247,166,.9);
}

.nav-cta{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  width:100%;margin-top:10px;padding:11px 18px;
  border-radius:var(--radius-pill);
  background:var(--orange);color:#170900;
  font-size:13.5px;font-weight:800;letter-spacing:.02em;
  box-shadow:0 12px 26px -16px rgba(255,122,61,.95);
  transition:transform .18s var(--ease),background .18s var(--ease),box-shadow .18s var(--ease);
}
.nav-cta::after{content:"→";font-family:var(--font-mono);font-size:13px}
.nav-cta:hover{transform:translateY(-1px);background:#ff8d5c;box-shadow:0 16px 30px -16px rgba(255,122,61,1)}

/* ---------- 12. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,96px);
  background:linear-gradient(180deg,rgba(11,27,51,.62),var(--void) 78%);
  border-top:1px solid var(--stone);
  color:var(--paper-70);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:2px;
  background:linear-gradient(90deg,transparent,var(--lime) 35%,var(--orange) 70%,transparent);
  opacity:.7;
}
.footer-shell{
  max-width:var(--shell-max);margin-inline:auto;
  padding:clamp(30px,5vw,56px) clamp(16px,3vw,28px) 24px;
}
.footer-strip{
  display:flex;align-items:center;gap:10px;
  margin-bottom:clamp(22px,3.4vw,34px);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
  color:rgba(116,247,166,.78);
}
.footer-strip::before{
  content:"";flex:none;width:6px;height:6px;border-radius:50%;
  background:var(--lime);box-shadow:0 0 10px rgba(116,247,166,.95);
}
.footer-top{display:grid;gap:clamp(26px,4vw,48px);grid-template-columns:1fr}
.footer-brand{display:grid;gap:12px;align-content:start}
.footer-name{display:flex;align-items:center;gap:10px;font-size:16px;font-weight:800;color:var(--paper)}
.footer-name .brand-mark{width:32px;height:32px;border-radius:9px;font-size:11px}
.footer-summary{max-width:36ch;font-size:14px;line-height:1.85;color:var(--paper-55)}

.footer-grid{display:grid;gap:22px 18px;grid-template-columns:repeat(auto-fit,minmax(130px,1fr))}
.footer-col{min-width:0}
.footer-col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:700;
  letter-spacing:.16em;text-transform:uppercase;
  color:rgba(155,196,255,.72);
}
.footer-links{display:grid;gap:8px;margin-top:12px}
.footer-link{
  display:inline-block;width:fit-content;
  font-size:14px;color:var(--paper-82);
  transition:color .18s var(--ease);
}
.footer-link:hover{color:var(--lime)}

.footer-contact{
  display:grid;gap:6px;
  margin-top:clamp(26px,4vw,44px);padding-top:20px;
  border-top:1px dashed var(--line);
}
.footer-contact-line{
  font-family:var(--font-mono);font-size:13px;letter-spacing:.02em;
  color:var(--paper-82);word-break:break-word;max-width:100%;
}
.footer-contact-note{font-size:12.5px;line-height:1.75;color:var(--paper-55);max-width:64ch}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 20px;
  margin-top:22px;padding-top:18px;
  border-top:1px solid rgba(42,52,66,.7);
  font-size:12.5px;color:var(--paper-55);
}
.footer-copyright,.footer-icp{font-family:var(--font-mono);letter-spacing:.05em}
.footer-legal{font-size:12.5px;color:var(--paper-55);max-width:38ch}

/* ---------- 13. 断点 ---------- */
@media (min-width:600px){
  .brand-tag{display:block}
  .footer-top{grid-template-columns:minmax(240px,.9fr) 1.5fr}
}
@media (min-width:900px){
  .site-header{padding-top:16px}
  .header-shell{
    display:grid;grid-template-columns:auto 1fr;align-items:center;gap:20px;
    padding:8px 10px 8px 20px;border-radius:var(--radius-pill);
  }
  .nav-toggle{display:none}
  .primary-nav{
    display:flex;flex-basis:auto;width:auto;grid-column:2;justify-self:end;
    align-items:center;gap:12px;
    padding:0;margin:0;border-top:0;
  }
  .primary-nav[data-open]{display:flex}
  .nav-list{flex-direction:row;align-items:center;gap:2px;width:auto}
  .nav-link{padding:8px 10px;font-size:13px}
  .nav-link[aria-current="page"]::after{left:10px;bottom:2px}
  .nav-cta{width:auto;margin-top:0;padding:9px 16px}
  .split{grid-template-columns:minmax(0,1.35fr) minmax(0,1fr)}
  .split--even{grid-template-columns:1fr 1fr}
}
@media (min-width:1100px){
  .brand-tag{font-size:10.5px}
  .nav-link{padding:9px 12px;font-size:13.5px}
  .nav-link[aria-current="page"]::after{left:12px;bottom:3px}
}
@media (max-width:899px){
  .site-header{padding-top:10px}
  .header-shell{border-radius:20px}
}

/* ---------- 14. 可访问性与降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .reveal-ready [data-reveal]{opacity:1;transform:none}
  .btn:hover,.nav-cta:hover{transform:none}
}