/* ===== OK赛场 shared site kit :: /assets/site.css ===== */

*,*::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}
img,svg{max-width:100%;display:block}
button{font:inherit;color:inherit}
a{color:inherit}

:root{
  --ink-900:#050D1A;
  --ink-800:#071426;
  --ink-700:#0B1F3A;
  --ink-750:#0D2544;
  --line:#1E3554;
  --line-soft:rgba(30,53,84,.72);
  --lime:#B8FF3D;
  --lime-soft:#7DE84B;
  --lime-08:rgba(184,255,61,.08);
  --lime-14:rgba(184,255,61,.14);
  --lime-28:rgba(184,255,61,.28);
  --orange:#FF8A2B;
  --ice:#F2F7FF;
  --ice-dim:#C8D6EA;
  --mist:#8FA3BF;
  --teal:#0E3B3A;

  --r-xl:32px;
  --r-lg:24px;
  --r-md:16px;
  --r-sm:12px;
  --r-pill:999px;

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

  --shell:1280px;
  --gutter:24px;
  --header-h:76px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --t-fast:140ms;
  --t:180ms;
}

html{background:var(--ink-900)}
body{
  background:
    radial-gradient(1100px 520px at 82% -12%, rgba(14,59,58,.55), transparent 62%),
    radial-gradient(760px 420px at -8% 8%, rgba(184,255,61,.07), transparent 60%),
    var(--ink-900);
  color:var(--ice);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.7;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  word-break:break-word;
  min-height:100vh;
}

h1,h2,h3,h4{font-family:var(--font-display);font-weight:900;letter-spacing:-.02em;line-height:1.12}
h1{font-size:clamp(34px,5.4vw,56px)}
h2{font-size:clamp(26px,3.6vw,36px)}
h3{font-size:clamp(20px,2.2vw,24px)}
h4{font-size:18px;letter-spacing:0}
p{max-width:72ch}

::selection{background:var(--lime);color:#04140A}

:where(a,button,summary,[tabindex]):focus-visible{
  outline:2px solid var(--lime);
  outline-offset:3px;
  border-radius:8px;
}
#main-content:focus-visible{outline:2px solid var(--lime);outline-offset:10px}

/* ---------- utilities ---------- */
.sr-only{
  position:absolute;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;
}
.shell{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(44px,6vw,88px)}
.section-head{display:grid;gap:14px;max-width:820px}
.rule{height:1px;border:0;background:var(--line);margin:0}
.lead{font-size:clamp(17px,1.4vw,20px);line-height:1.75;color:var(--ice-dim);max-width:64ch}
.prose{display:grid;gap:16px;max-width:72ch;color:var(--ice-dim)}
.prose h2,.prose h3{color:var(--ice);margin-top:12px}
.prose a{color:var(--lime);text-decoration:none;border-bottom:1px solid var(--lime-28)}
.prose a:hover{border-bottom-color:var(--lime)}

.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--lime);
}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:var(--lime)}

/* ---------- buttons ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  min-height:48px;padding:0 24px;border:1px solid transparent;
  border-radius:var(--r-pill);cursor:pointer;text-decoration:none;
  font-family:var(--font-display);font-size:15px;font-weight:800;letter-spacing:.02em;
  transition:background var(--t) var(--ease),color var(--t) var(--ease),
             border-color var(--t) var(--ease),transform var(--t-fast) var(--ease),
             box-shadow var(--t) var(--ease);
}
.btn--primary{background:var(--lime);color:#04140A;box-shadow:0 12px 30px -18px rgba(184,255,61,.9)}
.btn--primary:hover{background:#CDFF6E;transform:translateY(-1px);box-shadow:0 18px 34px -18px rgba(184,255,61,.95)}
.btn--ghost{background:transparent;color:var(--ice);border-color:var(--line)}
.btn--ghost:hover{border-color:var(--lime);color:var(--lime);background:var(--lime-08)}
.btn--sm{min-height:40px;padding:0 18px;font-size:14px}

/* ---------- skip link ---------- */
.skip-link{
  position:fixed;top:12px;left:12px;z-index:300;
  padding:12px 20px;border-radius:var(--r-sm);
  background:var(--lime);color:#04140A;
  font-family:var(--font-display);font-weight:800;font-size:14px;text-decoration:none;
  transform:translateY(-180%);
  transition:transform var(--t-fast) var(--ease);
}
.skip-link:focus,.skip-link:focus-visible{transform:none}

/* ---------- header : track frame ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  background:rgba(7,20,38,.94);
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid var(--line);
}
.site-header::before{
  content:"";position:absolute;top:0;left:0;right:0;height:2px;
  background:repeating-linear-gradient(90deg,var(--line) 0 14px,transparent 14px 28px);
  opacity:.85;pointer-events:none;
}
.site-header::after{
  content:"";position:absolute;left:0;top:0;bottom:0;width:3px;
  background:linear-gradient(180deg,var(--lime),rgba(184,255,61,0) 72%);
  pointer-events:none;
}
.header-frame{
  max-width:var(--shell);margin-inline:auto;
  min-height:var(--header-h);
  padding-inline:var(--gutter);
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;
  gap:18px;
}

/* brand */
.brand{display:inline-flex;align-items:center;gap:12px;text-decoration:none;padding-block:10px}
.brand-mark{
  display:inline-grid;place-items:center;
  width:42px;height:42px;flex:0 0 auto;
  border-radius:14px;
  background:linear-gradient(150deg,var(--lime),var(--lime-soft));
  color:#04140A;
  font-family:var(--font-mono);font-weight:700;font-size:16px;letter-spacing:-.02em;
  box-shadow:0 10px 24px -14px rgba(184,255,61,.95);
}
.brand-text{display:grid;gap:2px;line-height:1.1}
.brand-name{font-family:var(--font-display);font-weight:900;font-size:19px;letter-spacing:.01em;color:var(--ice)}
.brand-line{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--mist);
}
.brand:hover .brand-name{color:var(--lime)}

/* nav */
.primary-nav{justify-self:center;min-width:0}
.nav-list{display:flex;align-items:center;gap:4px;flex-wrap:wrap;list-style:none;margin:0;padding:0}
.nav-item{list-style:none}
.nav-link{
  position:relative;display:inline-flex;align-items:baseline;gap:8px;
  padding:9px 13px;border-radius:var(--r-pill);
  font-family:var(--font-display);font-size:15px;font-weight:600;
  color:var(--ice);text-decoration:none;
  border:1px solid transparent;
  transition:background var(--t) var(--ease),color var(--t) var(--ease),
             border-color var(--t) var(--ease);
}
.nav-num{
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.08em;color:var(--mist);
  transition:color var(--t) var(--ease);
}
.nav-link:hover{background:var(--lime-08);color:var(--lime);border-color:var(--lime-28)}
.nav-link:hover .nav-num{color:var(--lime)}
.nav-link[aria-current="page"]{
  background:var(--lime-14);color:var(--lime);border-color:var(--lime-28);
}
.nav-link[aria-current="page"] .nav-num{color:var(--lime)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:50%;bottom:3px;transform:translateX(-50%);
  width:16px;height:2px;border-radius:2px;background:var(--lime);
}
.nav-foot{display:none}

/* utility */
.header-utility{display:flex;align-items:center;gap:10px;justify-self:end;position:relative;z-index:3}
.header-cta{white-space:nowrap}

/* toggle */
.nav-toggle{
  display:none;align-items:center;gap:9px;
  min-height:40px;padding:0 14px;
  border:1px solid var(--line);border-radius:var(--r-pill);
  background:transparent;color:var(--ice);cursor:pointer;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease),background var(--t) var(--ease);
}
.nav-toggle:hover{border-color:var(--lime);color:var(--lime);background:var(--lime-08)}
.nav-toggle-bars{position:relative;width:16px;height:10px;display:block}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;border-radius:2px;
  background:currentColor;transition:transform var(--t) var(--ease),top var(--t) var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.site-header[data-open="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.site-header[data-open="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}
.site-header[data-open="true"] .nav-toggle{border-color:var(--lime);color:var(--lime);background:var(--lime-14)}

/* progress */
.header-progress{position:relative;height:2px;background:rgba(30,53,84,.7);overflow:hidden}
.header-progress-bar{
  display:block;height:100%;width:100%;
  transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--lime),var(--orange));
  transition:transform 90ms linear;
}

/* scrim */
.nav-scrim{position:fixed;inset:0;background:rgba(5,13,26,.66);z-index:1}
.nav-scrim[hidden]{display:none}

/* mobile / tablet navigation */
@media (max-width:960px){
  :root{--header-h:66px}
  .header-frame{grid-template-columns:1fr auto;gap:12px}
  .nav-toggle{display:inline-flex}
  .header-cta{display:none}
  .primary-nav{
    position:fixed;top:var(--header-h);right:0;left:auto;
    z-index:2;
    width:min(88vw,380px);
    height:calc(100vh - var(--header-h));
    height:calc(100dvh - var(--header-h));
    padding:26px 22px 44px;
    overflow-y:auto;
    background:var(--ink-800);
    border-left:1px solid var(--line);
    border-top-left-radius:var(--r-xl);
    box-shadow:-40px 0 70px -46px #000;
    opacity:0;visibility:hidden;transform:translateX(102%);
    transition:transform 220ms var(--ease),opacity var(--t) var(--ease),visibility 220ms;
  }
  .site-header[data-open="true"] .primary-nav{
    opacity:1;visibility:visible;transform:translateX(0);
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:6px}
  .nav-link{
    justify-content:flex-start;gap:14px;
    padding:15px 16px;border-radius:var(--r-md);
    border:1px solid var(--line-soft);font-size:17px;
  }
  .nav-num{font-size:12px;color:var(--lime)}
  .nav-link[aria-current="page"]::after{display:none}
  .nav-foot{
    display:block;margin-top:24px;
    font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;
    color:var(--mist);line-height:1.9;
    border-top:1px solid var(--line);padding-top:18px;
  }
  html.nav-open{overflow:hidden}
}

@media (max-width:420px){
  .brand-line{display:none}
  .brand-name{font-size:17px}
  .brand-mark{width:38px;height:38px;border-radius:12px;font-size:14px}
}

/* ---------- footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,88px);
  background:linear-gradient(180deg,var(--ink-800),var(--ink-900));
  border-top:1px solid var(--line);
  border-radius:var(--r-xl) var(--r-xl) 0 0;
  overflow:hidden;
}
.site-footer::before{
  content:"";position:absolute;top:0;left:0;right:0;height:3px;
  background:linear-gradient(90deg,var(--lime),var(--orange) 58%,rgba(255,138,43,0) 100%);
  border-top-left-radius:var(--r-xl);border-top-right-radius:var(--r-xl);
}
.footer-frame{
  max-width:var(--shell);margin-inline:auto;
  padding:clamp(36px,5vw,60px) var(--gutter) clamp(28px,4vw,40px);
  display:grid;gap:clamp(28px,4vw,44px);
  grid-template-columns:1.1fr 1.5fr 1.1fr;
  align-items:start;
}
.footer-brand{display:grid;gap:14px;align-content:start}
.footer-brand-mark{
  font-family:var(--font-display);font-weight:900;font-size:26px;
  letter-spacing:-.01em;color:var(--ice);text-decoration:none;width:max-content;
}
.footer-brand-mark:hover{color:var(--lime)}
.footer-brand-summary{color:var(--ice-dim);font-size:15px;line-height:1.7;max-width:34ch}
.footer-brand-meta{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;
  color:var(--mist);line-height:1.9;max-width:36ch;
}
.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(16px,3vw,28px)}
.footer-col-title{
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--lime);
  margin-bottom:14px;
}
.footer-links{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.footer-link{
  display:inline-block;color:var(--ice-dim);text-decoration:none;
  font-size:15px;line-height:1.4;
  border-bottom:1px solid transparent;
  transition:color var(--t) var(--ease),border-color var(--t) var(--ease);
}
.footer-link:hover{color:var(--lime);border-bottom-color:var(--lime-28)}
.footer-link[aria-current="page"]{color:var(--lime);border-bottom-color:var(--lime-28)}

.footer-contact{
  background:var(--ink-700);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:20px 20px 18px;
  display:grid;gap:14px;
}
.footer-contact-title{
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--mist);
}
.contact-list{list-style:none;margin:0;padding:0;display:grid;gap:12px}
.contact-item{
  display:grid;grid-template-columns:auto 1fr auto;align-items:center;gap:10px;
  padding-bottom:10px;border-bottom:1px dashed var(--line-soft);
}
.contact-item:last-child{border-bottom:0;padding-bottom:0}
.contact-label{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.1em;
  color:var(--mist);white-space:nowrap;
}
.contact-value{
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.02em;
  color:var(--ice);overflow-wrap:anywhere;
}
.copy-btn{
  min-height:30px;padding:0 12px;
  border:1px solid var(--line);border-radius:var(--r-pill);
  background:transparent;color:var(--ice-dim);cursor:pointer;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease),background var(--t) var(--ease);
}
.copy-btn:hover{border-color:var(--lime);color:var(--lime);background:var(--lime-08)}
.copy-btn[data-copied="true"]{border-color:var(--lime);color:#04140A;background:var(--lime)}

.footer-base{
  max-width:var(--shell);margin-inline:auto;
  padding:18px var(--gutter) 26px;
  border-top:1px solid var(--line);
  display:flex;flex-wrap:wrap;align-items:center;gap:10px 22px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--mist);
}
.footer-copy{max-width:none}
.footer-icp{
  padding:5px 12px;border:1px solid var(--line);border-radius:var(--r-pill);
  color:var(--ice-dim);
}
.footer-base-note{margin-left:auto;max-width:52ch;color:var(--mist)}

@media (max-width:1080px){
  .footer-frame{grid-template-columns:1fr 1fr}
  .footer-brand{grid-column:1 / -1}
  .footer-contact{grid-column:1 / -1}
  .footer-base-note{margin-left:0;width:100%}
}
@media (max-width:680px){
  .footer-frame{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:1fr 1fr}
  .contact-item{grid-template-columns:1fr auto}
  .contact-label{grid-column:1 / -1}
}

/* ---------- shared page building blocks ---------- */
.breadcrumb{margin-block:22px}
.breadcrumb ol{
  list-style:none;margin:0;padding:0;
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;color:var(--mist);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--line);font-family:var(--font-mono)}
.breadcrumb a{color:var(--mist);text-decoration:none;transition:color var(--t) var(--ease)}
.breadcrumb a:hover{color:var(--lime)}
.breadcrumb [aria-current="page"]{color:var(--ice)}

.chapter{display:flex;align-items:baseline;gap:clamp(12px,2vw,22px);flex-wrap:wrap}
.chapter-num{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(46px,8vw,84px);line-height:.86;letter-spacing:-.04em;
  color:transparent;
  -webkit-text-stroke:1.5px rgba(184,255,61,.55);
  text-stroke:1.5px rgba(184,255,61,.55);
}
.chapter-title{font-size:clamp(24px,3.2vw,34px);line-height:1.15}

.grid{display:grid;gap:clamp(16px,2.2vw,24px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--split{grid-template-columns:minmax(0,1.15fr) minmax(0,.85fr);align-items:start}

.card,.data-card{
  position:relative;
  background:var(--ink-700);
  border:1px solid var(--line);
  border-radius:var(--r-lg);
  padding:clamp(18px,2.4vw,26px);
  display:grid;gap:12px;align-content:start;
  transition:border-color var(--t) var(--ease),background var(--t) var(--ease),
             transform var(--t-fast) var(--ease);
}
.card:hover,.data-card:hover{
  border-color:var(--lime-28);background:var(--ink-750);transform:translateY(-2px);
}
.data-card{border-radius:var(--r-xl);background:linear-gradient(160deg,var(--ink-700),var(--teal))}
.stat{display:grid;gap:4px}
.stat-value{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(28px,4vw,46px);line-height:1;letter-spacing:.02em;
  color:var(--orange);font-variant-numeric:tabular-nums;
}
.stat-label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--mist);
}
.kv{list-style:none;margin:0;padding:0;display:grid;gap:10px}
.kv-item{
  display:flex;justify-content:space-between;gap:16px;
  padding-bottom:10px;border-bottom:1px dashed var(--line-soft);
  font-size:15px;
}
.kv-item:last-child{border-bottom:0;padding-bottom:0}
.kv-key{color:var(--mist)}
.kv-val{font-family:var(--font-mono);color:var(--ice);letter-spacing:.02em}

.chip-row{display:flex;flex-wrap:wrap;gap:10px}
.chip,.tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:7px 14px;border-radius:var(--r-pill);
  border:1px solid var(--line);background:rgba(11,31,58,.6);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--ice-dim);text-decoration:none;
  transition:border-color var(--t) var(--ease),color var(--t) var(--ease),background var(--t) var(--ease);
}
.chip:hover,.tag:hover{border-color:var(--lime);color:var(--lime);background:var(--lime-08)}
.chip[aria-pressed="true"],.chip[data-active="true"]{
  border-color:var(--lime);color:#04140A;background:var(--lime);font-weight:700;
}
.tag--accent{border-color:rgba(255,138,43,.5);color:var(--orange)}

/* image containers for the page stage */
.media{
  position:relative;overflow:hidden;
  border-radius:var(--r-lg);
  border:1px solid var(--line);
  background:linear-gradient(140deg,var(--ink-700),var(--teal));
  isolation:isolate;
}
.media > img,.media > picture > img,.media > video{
  width:100%;height:100%;object-fit:cover;display:block;
}
.media--hero{aspect-ratio:16 / 9}
.media--wide{aspect-ratio:21 / 9}
.media--square{aspect-ratio:1 / 1}
.media--portrait{aspect-ratio:3 / 4}
.media--data::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(180deg,rgba(5,13,26,0) 42%,rgba(5,13,26,.78) 100%),
    repeating-linear-gradient(90deg,rgba(184,255,61,.14) 0 1px,transparent 1px 52px),
    repeating-linear-gradient(0deg,rgba(184,255,61,.08) 0 1px,transparent 1px 52px);
}
.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:var(--mist);
}

@media (max-width:860px){
  .grid--2,.grid--3,.grid--split{grid-template-columns:1fr}
  .media--wide{aspect-ratio:16 / 9}
}

/* reveal (driven by data-reveal) */
html.js [data-reveal]{opacity:0;transform:translateY(16px)}
html.js [data-reveal].is-visible{
  opacity:1;transform:none;
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}

/* reduced motion */
@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 [data-reveal]{opacity:1;transform:none}
}