/* =========================================================
   开云体育官网 · 共享样式 /assets/site.css
   夜场靛蓝底 / 细线精密网格 / 青柠绿与电光橙战术强调
   ========================================================= */

/* ---------- 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,li,figure,blockquote,dl,dt,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,picture,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none !important}

/* ---------- tokens ---------- */
:root{
  --ink:#0E1B3D;
  --charcoal:#15181F;
  --indigo-2:#1B2A55;
  --silver:#C3CBD9;
  --muted:#6C7893;
  --lime:#B6FF3C;
  --orange:#FF6A1A;
  --cream:#EFE6D6;
  --paper:#F5F7FB;
  --brown:#2A2118;
  --line:rgba(195,203,217,.22);
  --line-strong:rgba(195,203,217,.42);
  --shell:1240px;
  --gutter:clamp(16px,4vw,40px);
  --font-display:"Arial Narrow","Helvetica Neue",Helvetica,"PingFang SC","Microsoft YaHei",sans-serif;
  --font-body:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --t-fast:180ms;
  --t-mid:240ms;
  --t-slow:320ms;
}
::selection{background:var(--lime);color:var(--ink)}

html{background:var(--ink)}
body{
  min-height:100vh;
  background-color:var(--ink);
  background-image:
    repeating-linear-gradient(115deg,rgba(195,203,217,.055) 0 1px,transparent 1px 72px),
    radial-gradient(120% 90% at 10% -12%,rgba(27,42,85,.9) 0%,rgba(14,27,61,0) 62%),
    radial-gradient(70% 55% at 104% 4%,rgba(182,255,60,.09) 0%,rgba(14,27,61,0) 60%);
  color:var(--paper);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.65;
  letter-spacing:.004em;
  -webkit-font-smoothing:antialiased;
}
:focus-visible{outline:2px solid var(--lime);outline-offset:2px}
#main-content{display:block}

/* ---------- layout ---------- */
.shell,.header-shell,.footer-shell{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding:clamp(40px,6vw,76px) 0}
.section__head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:12px 24px;padding-bottom:14px;border-bottom:1px solid var(--line);
  margin-bottom:clamp(20px,3vw,32px);
}
.section__title{
  font-family:var(--font-display);font-weight:300;text-transform:uppercase;
  font-size:clamp(26px,4.4vw,48px);line-height:1.02;letter-spacing:-.01em;color:var(--paper);
}
.section__note{font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--muted)}
.rule{height:1px;border:0;background:var(--line)}

.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap,20px)}
.grid-ruled{display:grid;gap:1px;background:var(--line);border:1px solid var(--line)}
.grid-ruled>*{background:var(--charcoal);min-width:0}

/* ---------- type helpers ---------- */
.display{
  font-family:var(--font-display);font-weight:300;text-transform:uppercase;
  font-size:clamp(44px,9vw,120px);line-height:.94;letter-spacing:-.015em;color:var(--paper);
}
.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-feature-settings:"tnum" 1}
.index-label{
  display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.28em;
  text-transform:uppercase;color:var(--muted);
}

/* ---------- buttons / tags ---------- */
.btn{
  display:inline-flex;align-items:center;gap:10px;padding:12px 20px;
  border:1px solid var(--line-strong);background:var(--charcoal);color:var(--paper);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  transition:background-color var(--t-fast) linear,color var(--t-fast) linear,border-color var(--t-fast) linear;
}
.btn:hover{background:var(--indigo-2);border-color:var(--silver)}
.btn--lime{background:var(--lime);border-color:var(--lime);color:var(--ink);font-weight:700}
.btn--lime:hover{background:#caff72;border-color:#caff72;color:var(--ink)}
.btn--orange{background:var(--orange);border-color:var(--orange);color:#1a1108;font-weight:700}
.btn--orange:hover{background:#ff8342;border-color:#ff8342;color:#1a1108}
.btn--ghost{background:transparent;color:var(--silver)}

.tag{
  display:inline-flex;align-items:center;gap:8px;padding:5px 10px;
  border:1px solid var(--line-strong);color:var(--silver);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;
}
.tag--lime{border-color:rgba(182,255,60,.5);color:var(--lime)}
.tag--orange{border-color:rgba(255,106,26,.5);color:var(--orange)}
.tag--paper{background:var(--cream);border-color:var(--cream);color:var(--brown)}

/* ---------- panels / cards ---------- */
.panel{background:var(--charcoal);border:1px solid var(--line);padding:clamp(16px,2.4vw,24px);min-width:0}
.panel--raised{background:var(--indigo-2)}
.panel--paper{background:var(--cream);border-color:rgba(42,33,24,.22);color:var(--brown)}
.panel--accent-lime{border-left:3px solid var(--lime)}
.panel--accent-orange{border-left:3px solid var(--orange)}

.card{
  display:flex;flex-direction:column;gap:12px;min-width:0;
  background:var(--charcoal);border:1px solid var(--line);padding:20px;
  transition:border-color var(--t-fast) linear;
}
.card:hover{border-color:var(--line-strong)}
.card__title{font-family:var(--font-display);font-size:clamp(19px,2.2vw,24px);line-height:1.24;color:var(--paper)}
.card__meta{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--muted)}
.card__text{font-size:15px;line-height:1.7;color:var(--silver)}

/* ---------- breadcrumb ---------- */
.breadcrumb{padding:14px 0}
.breadcrumb__list{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;text-transform:uppercase;color:var(--muted);
}
.breadcrumb__link{color:var(--silver)}
.breadcrumb__link:hover{color:var(--lime)}
.breadcrumb__item[aria-current="page"]{color:var(--paper)}
.breadcrumb__sep{color:var(--muted)}

/* ---------- prose ---------- */
.prose{max-width:72ch;font-size:16px;line-height:1.78;color:var(--silver)}
.prose>*+*{margin-top:18px}
.prose h2,.prose h3{font-family:var(--font-display);font-weight:300;color:var(--paper);line-height:1.22}
.prose h2{font-size:clamp(24px,3vw,30px);margin-top:36px}
.prose h3{font-size:clamp(19px,2.4vw,24px);margin-top:28px}
.prose ul{display:grid;gap:10px}
.prose ul li{position:relative;padding-left:20px}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:10px;height:1px;background:var(--lime)}
.prose strong{color:var(--paper)}
.prose a{color:var(--lime);border-bottom:1px solid rgba(182,255,60,.4)}
.prose--paper{color:var(--brown)}
.prose--paper h2,.prose--paper h3,.prose--paper strong{color:var(--brown)}
.prose--paper a{color:#8a3a00;border-bottom-color:rgba(42,33,24,.35)}
.prose--paper ul li::before{background:var(--orange)}

/* ---------- media (image container base) ---------- */
.media{
  position:relative;display:block;width:100%;overflow:hidden;
  background:var(--charcoal);border:1px solid var(--line);aspect-ratio:16 / 9;
}
.media--21x9{aspect-ratio:21 / 9}
.media--4x3{aspect-ratio:4 / 3}
.media--3x4{aspect-ratio:3 / 4}
.media--1x1{aspect-ratio:1 / 1}
.media__img{
  width:100%;height:100%;object-fit:cover;
  filter:saturate(.92) contrast(1.06) brightness(.94);
}
.media--night .media__img{filter:saturate(.85) contrast(1.12) brightness(.84) hue-rotate(-6deg)}
.media__frame{
  position:absolute;inset:0;pointer-events:none;mix-blend-mode:screen;
  background-image:
    repeating-linear-gradient(90deg,rgba(195,203,217,.14) 0 1px,transparent 1px 25%),
    repeating-linear-gradient(0deg,rgba(195,203,217,.14) 0 1px,transparent 1px 25%);
}
.media__scrim{
  position:absolute;inset:0;pointer-events:none;
  background:
    linear-gradient(190deg,rgba(14,27,61,0) 42%,rgba(14,27,61,.86) 100%),
    linear-gradient(90deg,rgba(255,106,26,.16),rgba(14,27,61,0) 58%);
}
.media__cap{
  display:block;margin-top:10px;font-family:var(--font-mono);font-size:11px;
  letter-spacing:.14em;text-transform:uppercase;color:var(--muted);
}

/* ---------- reveal ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity var(--t-slow) linear,transform var(--t-slow) linear}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* =========================================================
   HEADER
   ========================================================= */
.skip-link{
  position:absolute;left:8px;top:-80px;z-index:130;
  padding:10px 16px;background:var(--lime);color:var(--ink);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;
  transition:top var(--t-fast) linear;
}
.skip-link:focus{top:8px}

.site-header{
  position:sticky;top:0;z-index:70;
  background:linear-gradient(180deg,rgba(14,27,61,.99),rgba(14,27,61,.94));
  border-bottom:1px solid var(--line-strong);
}
.progress-rail{position:absolute;left:0;right:0;bottom:-1px;height:2px;background:rgba(195,203,217,.12)}
.progress-rail__bar{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--lime),var(--orange));
  transition:width 120ms linear;
}

.header-ledger{
  display:grid;grid-template-columns:repeat(12,minmax(0,1fr));
  gap:10px 14px;align-items:center;padding:10px 0;
  border-bottom:1px solid var(--line);
}
.entry-notice{
  grid-column:2 / span 6;
  display:flex;align-items:center;gap:10px;min-width:0;
  padding:9px 12px;background:var(--charcoal);
  border-left:3px solid var(--orange);
}
.entry-notice__tag{
  flex:none;padding:3px 8px;background:rgba(255,106,26,.14);color:var(--orange);
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;text-transform:uppercase;
}
.entry-notice__text{font-size:13.5px;line-height:1.5;color:var(--silver)}

.header-utility{
  grid-column:9 / span 4;
  display:flex;flex-wrap:wrap;align-items:center;justify-content:flex-end;gap:8px;
}
.util-link,.util-btn{
  display:inline-flex;align-items:center;gap:8px;padding:8px 12px;
  border:1px solid var(--line);background:transparent;color:var(--silver);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;white-space:nowrap;
  transition:color var(--t-fast) linear,background-color var(--t-fast) linear,border-color var(--t-fast) linear;
}
.util-link:hover,.util-btn:hover{color:var(--ink);background:var(--lime);border-color:var(--lime)}
.util-btn[aria-expanded="true"]{color:#1a1108;background:var(--orange);border-color:var(--orange)}
.round-chip{
  display:inline-flex;align-items:baseline;gap:8px;padding:6px 12px;
  border:1px solid rgba(182,255,60,.45);background:rgba(182,255,60,.06);white-space:nowrap;
}
.round-chip__label{font-family:var(--font-mono);font-size:10px;letter-spacing:.24em;text-transform:uppercase;color:rgba(182,255,60,.78)}
.round-chip__num{font-family:var(--font-mono);font-size:18px;line-height:1;font-variant-numeric:tabular-nums;color:var(--lime)}

.compat{
  margin:12px 0 0;padding:14px 16px;
  background:var(--charcoal);border:1px solid var(--line-strong);border-left:3px solid var(--lime);
  max-height:min(56vh,420px);overflow:auto;
}
.compat__head{
  display:flex;flex-wrap:wrap;align-items:baseline;gap:8px 16px;
  padding-bottom:10px;margin-bottom:10px;border-bottom:1px solid var(--line);
}
.compat__title{font-family:var(--font-display);font-weight:300;font-size:20px;text-transform:uppercase;letter-spacing:.04em;color:var(--paper)}
.compat__list{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:1px;background:var(--line)}
.compat__item{display:grid;gap:6px;align-content:start;background:var(--indigo-2);padding:12px}
.compat__label{font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted)}
.compat__value{font-size:14px;color:var(--lime);word-break:break-word}
.compat__hint{font-size:12px;line-height:1.5;color:var(--silver)}

.masthead{
  display:flex;flex-direction:column;align-items:center;gap:6px;
  padding:20px 0 16px;border-bottom:1px solid var(--line-strong);text-align:center;
}
.masthead__kicker{font-family:var(--font-mono);font-size:11px;letter-spacing:.3em;text-transform:uppercase;color:var(--muted)}
.masthead__brand{
  display:flex;flex-wrap:wrap;align-items:baseline;justify-content:center;
  gap:clamp(12px,3vw,30px);font-family:var(--font-display);text-transform:uppercase;
}
.masthead__mark{
  font-size:clamp(38px,7.4vw,74px);font-weight:300;line-height:1;
  letter-spacing:.02em;color:var(--paper);
}
.masthead__round{font-family:var(--font-mono);font-size:clamp(14px,2.4vw,20px);letter-spacing:.06em;color:var(--silver)}
.masthead__num{font-size:1.7em;color:var(--lime);margin:0 2px}

.nav-row{position:relative;display:flex;align-items:center;justify-content:center;padding:2px 0}
.nav-toggle{
  display:none;align-items:center;gap:10px;padding:11px 14px;
  border:1px solid var(--line-strong);background:var(--charcoal);color:var(--silver);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;text-transform:uppercase;
}
.nav-toggle__bars{position:relative;display:block;width:18px;height:2px;background:currentColor}
.nav-toggle__bars::before,.nav-toggle__bars::after{content:"";position:absolute;left:0;width:18px;height:2px;background:currentColor}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"]{color:var(--lime);border-color:var(--lime)}

.site-nav__list{display:flex;flex-wrap:wrap;justify-content:center;gap:2px}
.site-nav__link{
  display:block;padding:13px 17px;font-size:14px;letter-spacing:.06em;color:var(--silver);
  border-bottom:2px solid transparent;
  transition:color var(--t-fast) linear,background-color var(--t-fast) linear,border-color var(--t-fast) linear;
}
.site-nav__link:hover{color:var(--paper);background:var(--charcoal)}
.site-nav__link[aria-current="page"]{color:var(--lime);background:var(--charcoal);border-bottom-color:var(--lime)}

/* =========================================================
   FOOTER
   ========================================================= */
.site-footer{margin-top:clamp(48px,8vw,96px);background:var(--charcoal);border-top:1px solid var(--line-strong)}
.footer-update{background:var(--cream);color:var(--brown);border-bottom:1px solid rgba(42,33,24,.25)}
.footer-update__inner{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;padding-block:10px}
.footer-update__dot{flex:none;width:12px;height:12px;background:var(--orange)}
.footer-update__text{font-family:var(--font-mono);font-size:13px;letter-spacing:.1em;text-transform:uppercase}
.footer-update__text .num{font-size:16px;color:#8a3a00}
.footer-update__note{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:rgba(42,33,24,.65)}

.footer-shell{padding-block:0}
.footer-grid{display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:1px;background:var(--line);margin-top:clamp(28px,4vw,48px);border:1px solid var(--line)}
.footer-col{display:flex;flex-direction:column;gap:12px;min-width:0;background:var(--charcoal);padding:22px 20px}
.footer-col--brand{border-left:3px solid var(--lime)}
.footer-brand{font-family:var(--font-display);font-weight:300;font-size:clamp(22px,2.6vw,30px);letter-spacing:.02em;color:var(--paper)}
.footer-brand__line{font-size:14px;line-height:1.7;color:var(--silver);max-width:28ch}
.footer-cta{margin-top:auto;align-self:flex-start}
.footer-col__title{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--muted);padding-bottom:10px;border-bottom:1px solid var(--line);
}
.footer-list{display:grid;gap:2px}
.footer-list__link{
  display:inline-block;padding:5px 0;font-size:14px;color:var(--silver);
  border-left:2px solid transparent;padding-left:0;
  transition:color var(--t-fast) linear,padding-left var(--t-fast) linear,border-color var(--t-fast) linear;
}
.footer-list__link:hover{color:var(--lime);padding-left:10px;border-left-color:var(--lime)}

.footer-contact{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:1px;background:var(--line);border:1px solid var(--line);border-top:0;
}
.footer-contact__row{display:grid;gap:6px;align-content:start;background:var(--indigo-2);padding:16px 18px}
.footer-contact__label{font-family:var(--font-mono);font-size:10px;letter-spacing:.22em;text-transform:uppercase;color:var(--muted)}
.footer-contact__value{font-size:13.5px;line-height:1.6;color:var(--paper);word-break:break-word}

.footer-note{padding:16px 0 0;font-size:13.5px;line-height:1.7;color:var(--silver)}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px 24px;
  margin-top:20px;padding:16px 0 22px;border-top:1px solid var(--line);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;text-transform:uppercase;color:var(--muted);
}
.footer-legal__links{display:flex;flex-wrap:wrap;gap:8px 20px}
.footer-legal__link{color:var(--silver);border-bottom:1px solid transparent;transition:color var(--t-fast) linear,border-color var(--t-fast) linear}
.footer-legal__link:hover{color:var(--lime);border-bottom-color:var(--lime)}
.footer-legal__copy{color:var(--muted)}

.to-top{
  position:fixed;right:clamp(12px,3vw,26px);bottom:clamp(12px,3vw,26px);z-index:90;
  display:inline-flex;align-items:center;gap:8px;padding:11px 14px;
  background:var(--charcoal);border:1px solid var(--line-strong);color:var(--silver);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity var(--t-fast) linear,transform var(--t-fast) linear,visibility var(--t-fast) linear,color var(--t-fast) linear,border-color var(--t-fast) linear;
}
.to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.to-top:hover{color:var(--lime);border-color:var(--lime)}

/* =========================================================
   RESPONSIVE
   ========================================================= */
@media (max-width:1100px){
  .compat__list{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-contact{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .header-ledger{grid-template-columns:1fr}
  .entry-notice{grid-column:1 / -1}
  .header-utility{grid-column:1 / -1;justify-content:flex-start}
  .nav-row{justify-content:flex-end;padding:8px 0}
  .nav-toggle{display:inline-flex}
  .site-nav{
    display:none;position:absolute;top:100%;
    left:calc(var(--gutter) * -1);right:calc(var(--gutter) * -1);
    background:var(--charcoal);border-top:2px solid var(--lime);border-bottom:1px solid var(--line-strong);
    max-height:70vh;overflow:auto;z-index:80;
  }
  .site-nav[data-open]{display:block}
  .site-nav__list{flex-direction:column;flex-wrap:nowrap;gap:0;justify-content:flex-start}
  .site-nav__item{width:100%}
  .site-nav__link{
    padding:15px 18px;border-bottom:1px solid var(--line);
    border-left:3px solid transparent;
  }
  .site-nav__link[aria-current="page"]{border-bottom-color:var(--line);border-left-color:var(--lime)}
  .footer-grid{grid-template-columns:1fr 1fr}
  .footer-col--brand{grid-column:1 / -1}
}
@media (max-width:600px){
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .compat__list{grid-template-columns:1fr}
  .footer-grid{grid-template-columns:1fr}
  .footer-contact{grid-template-columns:1fr}
  .footer-legal{flex-direction:column;align-items:flex-start}
}

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