/* ============================================================
   赛事通体育 / ARENAFLOW — shared site kit
   /assets/site.css
   01 tokens · 02 reset · 03 base · 04 helpers · 05 buttons
   06 labels/cards/media · 07 breadcrumbs · 08 header
   09 footer · 10 responsive · 11 motion
   ============================================================ */

/* ---------- 01 tokens ---------- */
:root{
  --ink-900:#061812;
  --ink-800:#0C2A20;
  --ink-700:#123A2B;
  --paper:#F2EFE6;
  --neon:#35F2A4;
  --neon-soft:#9BFFD8;
  --orange:#FF8B3D;
  --muted:#B7C8BF;
  --line:#2F5848;
  --black:#020806;

  --font-display:"Noto Serif SC","Source Han Serif SC","Songti SC","STSong",serif;
  --font-label:"Barlow Condensed","Oswald","Noto Sans SC Condensed","PingFang SC",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;
  --font-body:"Noto Sans SC","Source Han Sans SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;

  --rail-w:88px;
  --topbar-h:62px;
  --gutter:24px;
  --maxw:1440px;
  --dur:.3s;
  --ease:cubic-bezier(.2,.75,.25,1);
  --shadow-plate:0 18px 44px rgba(2,8,6,.5);
}

/* ---------- 02 reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,figure,blockquote,pre{margin:0}
ul,ol{padding:0}
ul[class],ol[class],nav ul,nav ol{list-style:none}
img,svg,picture,video,canvas{display:block;max-width:100%}
button{font:inherit;color:inherit}
table{border-collapse:collapse;width:100%}

/* ---------- 03 base ---------- */
body{
  min-height:100vh;
  padding-left:var(--rail-w);
  background:var(--ink-900);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.7;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
h1,h2,h3{font-family:var(--font-display);font-weight:900;line-height:1.1;letter-spacing:.01em}
h1{font-size:clamp(34px,6vw,72px)}
h2{font-size:clamp(26px,3.4vw,44px)}
h3{font-size:clamp(20px,2.2vw,28px)}
h4,h5,h6{font-family:var(--font-label);font-weight:600;letter-spacing:.16em;text-transform:uppercase;font-size:13px;color:var(--muted)}
p{text-wrap:pretty}
a{color:var(--neon);text-underline-offset:3px}
strong{font-weight:700;color:var(--paper)}
::selection{background:var(--neon);color:var(--ink-900)}
:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--neon);
  outline-offset:3px;
  border-radius:2px;
}

/* ---------- 04 helpers ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:clamp(16px,3vw,40px);
}
.wrap--narrow{max-width:980px}
.grid{display:grid;gap:var(--gutter)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.section-head{padding:clamp(32px,5vw,64px) 0 20px;border-top:1px solid var(--line)}
.section-head__kicker{
  display:inline-block;margin-bottom:10px;padding:4px 9px;
  font-family:var(--font-label);font-size:11px;letter-spacing:.24em;font-weight:600;
  color:var(--ink-900);background:var(--paper);
}
.section-head__title{margin:0;font-family:var(--font-display);font-weight:900;font-size:clamp(24px,3.2vw,40px);line-height:1.12}
.prose{max-width:68ch}
.prose p{margin:0 0 1em;color:var(--muted)}
.prose p:last-child{margin-bottom:0}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;padding:0;margin:-1px;
  overflow:hidden;clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;border:0;
}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}

/* ---------- 05 buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:13px 22px;
  font-family:var(--font-label);font-size:14px;font-weight:600;letter-spacing:.14em;
  text-decoration:none;text-align:center;border-radius:2px;
  border:1px solid var(--line);background:transparent;color:var(--paper);
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{transform:translateY(-1px)}
.btn--neon{background:var(--neon);border-color:var(--neon);color:var(--ink-900)}
.btn--neon:hover{background:var(--neon-soft);border-color:var(--neon-soft)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--paper)}
.btn--ghost:hover{border-color:var(--neon);color:var(--neon)}
.btn--block{width:100%}
.btn--rail{writing-mode:vertical-rl;padding:14px 10px;font-size:12px;letter-spacing:.22em;line-height:1.2}

/* ---------- 06 labels / cards / media ---------- */
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;border:1px solid var(--line);
  background:rgba(18,58,43,.65);color:var(--muted);
  font-family:var(--font-label);font-size:11px;font-weight:600;letter-spacing:.18em;text-transform:uppercase;
  white-space:nowrap;
}
.tag--live{background:var(--neon);border-color:var(--neon);color:var(--ink-900)}
.tag--alert{background:var(--orange);border-color:var(--orange);color:var(--ink-900)}
.tag--paper{background:var(--paper);border-color:var(--paper);color:var(--ink-900)}

.plate{
  display:inline-block;padding:12px 16px;
  background:var(--paper);color:var(--ink-900);
  border:1px solid var(--paper);
  font-family:var(--font-label);font-size:12px;font-weight:600;letter-spacing:.18em;
  box-shadow:4px 4px 0 rgba(2,8,6,.55);
}

.panel{
  background:var(--ink-800);
  border:1px solid var(--line);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:var(--shadow-plate);
}

.card{
  position:relative;
  background:var(--ink-800);
  border:1px solid var(--line);
  padding:clamp(18px,2vw,24px);
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
.card:hover{border-color:var(--neon);background:var(--ink-700);transform:translateY(-2px)}
.card__index{display:block;font-family:var(--font-mono);font-size:12px;color:var(--neon);letter-spacing:.08em}
.card__title{margin:10px 0 6px;font-family:var(--font-display);font-size:20px;font-weight:700;line-height:1.25}
.card__text{margin:0;font-size:15px;line-height:1.65;color:var(--muted)}

/* 可复用图片容器：页面阶段放置真实图片或 CSS 视觉 */
.media{
  position:relative;display:block;overflow:hidden;
  background:linear-gradient(135deg,var(--ink-700),var(--ink-800) 55%,var(--black));
  border:1px solid var(--line);
}
.media > img,.media > picture > img,.media__img{
  width:100%;height:100%;object-fit:cover;display:block;
  filter:saturate(.85) contrast(1.05);
}
.media--4x3{aspect-ratio:4/3}
.media--16x9{aspect-ratio:16/9}
.media--1x1{aspect-ratio:1/1}
.media--slant{clip-path:polygon(0 0,100% 0,100% 84%,0 100%)}
.media__grid{
  position:absolute;inset:0;pointer-events:none;opacity:.28;
  background-image:
    repeating-linear-gradient(0deg,rgba(53,242,164,.35) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(90deg,rgba(53,242,164,.35) 0 1px,transparent 1px 44px);
  mix-blend-mode:screen;
}
.media__caption{
  margin-top:10px;
  font-family:var(--font-label);font-size:12px;letter-spacing:.16em;color:var(--muted);
}

/* ---------- 07 breadcrumbs ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  padding:22px 0 0;
  font-family:var(--font-label);font-size:12px;letter-spacing:.16em;color:var(--muted);
}
.breadcrumbs a{color:var(--muted);text-decoration:none}
.breadcrumbs a:hover{color:var(--neon)}
.breadcrumbs__sep{color:var(--line)}
.breadcrumbs__current{color:var(--paper)}

/* ---------- 08 header : desktop side rail ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  padding:11px 18px;border-radius:2px;
  background:var(--neon);color:var(--ink-900);
  font-family:var(--font-label);font-size:13px;font-weight:600;letter-spacing:.16em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:translateY(0)}

.site-header{
  position:fixed;top:0;left:0;bottom:0;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  background:linear-gradient(180deg,var(--ink-800) 0%,var(--ink-900) 62%,var(--ink-900) 100%);
  border-right:1px solid var(--line);
  z-index:80;
}
.site-header::before{
  content:"";position:absolute;top:0;left:0;width:100%;height:3px;
  background:linear-gradient(90deg,var(--neon),var(--neon-soft) 58%,transparent);
  opacity:.9;
}

.masthead{
  display:flex;flex-direction:column;align-items:center;gap:12px;
  padding:20px 0 14px;
  border-bottom:1px solid var(--line);
}
.brand{
  display:flex;flex-direction:column;align-items:center;gap:12px;
  text-decoration:none;color:var(--paper);
}
.brand__mark{
  display:grid;place-items:center;
  width:34px;height:34px;border-radius:2px;
  background:var(--neon);color:var(--ink-900);
  font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.02em;
  box-shadow:0 0 0 1px rgba(53,242,164,.45),0 0 22px rgba(53,242,164,.28);
}
.brand__text{display:flex;align-items:flex-start;gap:7px}
.brand__cn{
  writing-mode:vertical-rl;line-height:1;
  font-family:var(--font-display);font-weight:900;font-size:15px;letter-spacing:.2em;
  color:var(--paper);
}
.brand__en{
  writing-mode:vertical-rl;line-height:1;
  font-family:var(--font-label);font-weight:600;font-size:10px;letter-spacing:.3em;
  color:var(--muted);
}

.nav-toggle{
  display:none;align-items:center;gap:10px;
  padding:9px 13px;border:1px solid var(--line);border-radius:2px;
  background:transparent;color:var(--paper);cursor:pointer;
  font-family:var(--font-label);font-size:13px;font-weight:600;letter-spacing:.16em;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--neon);color:var(--neon)}
.nav-toggle__bars{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle__bars > span{
  display:block;height:2px;width:100%;background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars > span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__label{white-space:nowrap}

.site-nav{
  flex:1 1 auto;
  display:flex;flex-direction:column;align-items:center;
  padding:14px 0 10px;
  overflow-y:auto;overflow-x:hidden;
  scrollbar-width:thin;scrollbar-color:var(--line) transparent;
  transition:transform .34s var(--ease),visibility .34s var(--ease);
}
.site-nav__eyebrow{
  margin:0 0 14px;
  writing-mode:vertical-rl;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.34em;color:var(--line);
  text-transform:uppercase;
}
.site-nav__list{
  display:flex;flex-direction:column;align-items:center;gap:2px;
  width:100%;margin:0;padding:0;list-style:none;
}
.site-nav__item{width:100%}
.site-nav__link{
  position:relative;
  display:flex;align-items:center;justify-content:center;gap:9px;
  width:100%;padding:11px 0;
  color:var(--muted);text-decoration:none;
  font-family:var(--font-label);font-size:14px;font-weight:600;letter-spacing:.16em;
  transition:color var(--dur) var(--ease),background var(--dur) var(--ease);
}
.site-nav__link:hover,.site-nav__link:focus-visible{
  color:var(--paper);
  background:rgba(53,242,164,.08);
}
.site-nav__num{
  writing-mode:vertical-rl;line-height:1;
  font-family:var(--font-mono);font-size:10px;letter-spacing:.1em;color:var(--line);
  transition:color var(--dur) var(--ease);
}
.site-nav__label{writing-mode:vertical-rl;line-height:1.05}
.site-nav__link[aria-current="page"]{color:var(--neon);background:rgba(53,242,164,.07)}
.site-nav__link[aria-current="page"] .site-nav__num{color:var(--neon)}
.site-nav__link[aria-current="page"]::before{
  content:"";position:absolute;left:0;top:10px;bottom:10px;width:2px;background:var(--neon);
}
.site-nav__foot{
  display:flex;flex-direction:column;align-items:center;gap:10px;
  width:100%;margin-top:auto;padding:14px 10px 4px;
  border-top:1px solid var(--line);
}
.site-nav__note{
  margin:0;writing-mode:vertical-rl;
  font-family:var(--font-label);font-size:10px;letter-spacing:.22em;color:var(--muted);
}

.rail-progress{
  position:absolute;top:0;right:-1px;bottom:0;width:2px;
  background:rgba(47,88,72,.45);
  pointer-events:none;
}
.rail-progress__bar{
  display:block;width:100%;height:100%;
  background:var(--neon);
  transform:scaleY(0);transform-origin:top center;
  transition:transform .12s linear;
}

.nav-scrim{display:none}

/* ---------- 09 footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(64px,9vw,132px);
  padding:clamp(38px,5.5vw,72px) 0 26px;
  background:
    radial-gradient(120% 90% at 88% 0%,rgba(53,242,164,.10),transparent 62%),
    var(--ink-800);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--neon),var(--neon-soft) 26%,var(--line) 62%,var(--orange) 100%);
}
.site-footer__inner{
  width:100%;max-width:var(--maxw);margin-inline:auto;
  padding-inline:clamp(16px,3vw,40px);
}

.footer-mast{
  display:grid;grid-template-columns:minmax(0,1fr) auto;
  gap:24px 32px;align-items:end;
  padding-bottom:clamp(24px,3vw,34px);
  border-bottom:1px solid var(--line);
}
.footer-mast__tag{
  display:inline-block;margin:0 0 16px;padding:5px 10px;
  background:var(--paper);color:var(--ink-900);
  font-family:var(--font-label);font-size:11px;font-weight:600;letter-spacing:.22em;
  box-shadow:4px 4px 0 rgba(2,8,6,.55);
}
.footer-mast__line{
  margin:0 0 10px;
  font-family:var(--font-display);font-weight:900;
  font-size:clamp(21px,2.6vw,32px);line-height:1.28;
  max-width:20em;
}
.footer-mast__line--dim{
  font-family:var(--font-body);font-weight:400;
  font-size:15px;line-height:1.7;color:var(--muted);max-width:34em;
}
.footer-mast__score{
  display:flex;align-items:baseline;gap:8px;
  color:var(--neon);
}
.footer-mast__num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(56px,7vw,96px);line-height:.78;letter-spacing:-.05em;
}
.footer-mast__unit{
  font-family:var(--font-label);font-size:14px;font-weight:600;letter-spacing:.22em;color:var(--muted);
}

.footer-grid{
  display:grid;grid-template-columns:repeat(3,minmax(0,1fr)) minmax(0,1.2fr);
  gap:32px 24px;
  padding:clamp(26px,3.4vw,40px) 0;
}
.footer-col{min-width:0}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-label);font-size:11px;font-weight:600;letter-spacing:.24em;
  text-transform:uppercase;color:var(--muted);
  padding-bottom:8px;border-bottom:1px solid var(--line);
}
.footer-col__list{display:flex;flex-direction:column;gap:10px;margin:0;padding:0;list-style:none}
.footer-link{
  display:inline-block;
  color:var(--paper);text-decoration:none;font-size:15px;line-height:1.5;
  border-bottom:1px solid transparent;padding-bottom:1px;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-link:hover{color:var(--neon);border-bottom-color:var(--neon)}
.footer-link--up{
  font-family:var(--font-label);font-size:12px;letter-spacing:.16em;color:var(--muted);
}
.footer-meta{
  font-size:13px;line-height:1.55;color:var(--muted);
}
.footer-meta__val{
  display:block;margin-top:2px;
  font-family:var(--font-mono);font-size:13px;color:var(--paper);
  word-break:break-word;
}
.footer-col--contact{
  padding:16px 18px 18px;
  background:var(--ink-700);
  border:1px solid var(--line);
  align-self:start;
  box-shadow:var(--shadow-plate);
}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:14px 22px;
  padding-top:20px;border-top:1px solid var(--line);
}
.footer-copy{margin:0;font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;color:var(--muted)}
.footer-legal{
  margin:0;padding:3px 8px;
  border:1px solid var(--line);
  font-family:var(--font-label);font-size:11px;letter-spacing:.16em;color:var(--muted);
}
.footer-bottom__actions{display:flex;flex-wrap:wrap;align-items:center;gap:14px}
.to-top{
  display:inline-flex;align-items:center;gap:8px;
  padding:9px 14px;border-radius:2px;
  border:1px solid var(--line);background:transparent;color:var(--paper);
  font-family:var(--font-label);font-size:12px;font-weight:600;letter-spacing:.16em;
  cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(6px);
  transition:opacity var(--dur) var(--ease),transform var(--dur) var(--ease),visibility var(--dur) var(--ease),border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--neon);color:var(--neon)}

/* ---------- 10 responsive ---------- */
@media (max-width:1180px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col--contact{grid-column:1 / -1}
}
@media (max-height:860px) and (min-width:961px){
  .brand__cn{font-size:13px}
  .brand__en{font-size:9px}
  .site-nav__link{font-size:12px;padding:9px 0}
  .site-nav__eyebrow{display:none}
}

@media (max-width:960px){
  :root{--rail-w:0px}
  body{padding-left:0}
  body.is-nav-open{overflow:hidden}

  .site-header{
    position:sticky;top:0;left:0;right:0;bottom:auto;
    width:100%;height:var(--topbar-h);
    flex-direction:row;align-items:center;justify-content:space-between;
    padding:0 16px;
    background:rgba(6,24,18,.96);
    border-right:0;border-bottom:1px solid var(--line);
    backdrop-filter:blur(8px);
  }
  .site-header::before{height:2px}
  .masthead{
    flex-direction:row;align-items:center;justify-content:space-between;
    width:100%;padding:0;border-bottom:0;gap:12px;
  }
  .brand{flex-direction:row;align-items:center;gap:10px}
  .brand__mark{width:28px;height:28px;font-size:10px}
  .brand__text{flex-direction:row;align-items:center;gap:10px}
  .brand__cn{writing-mode:horizontal-tb;font-size:16px;letter-spacing:.1em}
  .brand__en{
    writing-mode:horizontal-tb;font-size:10px;letter-spacing:.24em;
    padding-left:10px;border-left:1px solid var(--line);
  }
  .nav-toggle{display:inline-flex}
  .rail-progress{display:none}

  .site-nav{
    position:fixed;top:var(--topbar-h);right:0;bottom:0;left:auto;
    width:min(88vw,380px);
    padding:24px 20px calc(24px + env(safe-area-inset-bottom));
    background:var(--ink-800);
    border-left:1px solid var(--line);
    align-items:stretch;
    transform:translateX(102%);
    visibility:hidden;
    overflow-y:auto;
    z-index:95;
    box-shadow:-30px 0 70px rgba(2,8,6,.66);
  }
  .site-nav[data-open="true"]{transform:translateX(0);visibility:visible}
  .site-nav__eyebrow{
    writing-mode:horizontal-tb;margin:0 0 8px;
    font-size:11px;letter-spacing:.3em;color:var(--neon);
  }
  .site-nav__list{align-items:stretch;gap:0}
  .site-nav__link{
    justify-content:flex-start;gap:16px;
    padding:16px 8px;
    border-bottom:1px solid var(--line);
    font-family:var(--font-display);font-size:21px;font-weight:700;letter-spacing:.04em;
    color:var(--paper);
  }
  .site-nav__num{
    writing-mode:horizontal-tb;min-width:24px;
    font-size:11px;color:var(--line);
  }
  .site-nav__label{writing-mode:horizontal-tb}
  .site-nav__link[aria-current="page"]{background:rgba(53,242,164,.08)}
  .site-nav__link[aria-current="page"]::before{left:0;top:14px;bottom:14px}
  .site-nav__foot{
    margin-top:auto;padding:20px 0 0;
    flex-direction:column;align-items:stretch;gap:10px;
  }
  .btn--rail{writing-mode:horizontal-tb;padding:15px 18px;font-size:15px;letter-spacing:.14em}
  .site-nav__note{
    writing-mode:horizontal-tb;text-align:center;
    font-size:11px;letter-spacing:.16em;
  }
  .nav-scrim{
    display:block;position:fixed;top:var(--topbar-h);right:0;bottom:0;left:0;
    padding:0;border:0;background:rgba(2,8,6,.66);
    opacity:0;visibility:hidden;z-index:90;cursor:pointer;
    transition:opacity var(--dur) var(--ease),visibility var(--dur) var(--ease);
  }
  .nav-scrim[data-open="true"]{opacity:1;visibility:visible}

  .grid--2{grid-template-columns:minmax(0,1fr)}
  .footer-mast{grid-template-columns:minmax(0,1fr);align-items:start}
  .footer-mast__score{order:-1}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

@media (max-width:560px){
  body{font-size:16px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:26px}
  .footer-col--contact{padding:14px 16px 16px}
  .footer-mast__num{font-size:56px}
  .brand__en{display:none}
  .to-top{padding:8px 12px}
}

/* ---------- 11 motion ---------- */
html.js-ready [data-reveal]{
  opacity:0;transform:translateY(18px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
}
html.js-ready [data-reveal].is-visible{opacity:1;transform:none}

@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  html.js-ready [data-reveal]{opacity:1;transform:none}
  .rail-progress__bar{transition:none}
}