/* ==========================================================================
   乐竞体育 · 共享样式表 /assets/site.css
   高原夜蓝 × 竞技场炽金 · 经幡五色做数据标记 · 12 列 / 8px 基线
   锐利直角、1px 细线、精密网格；无圆角、无投影
   ========================================================================== */

/* --- 01 reset ----------------------------------------------------------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,p,ul,ol,li,figure,figcaption,dl,dd{margin:0}
ul[class],ol[class]{list-style:none;padding:0}
img,svg,video,picture{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
main{display:block}

/* --- 02 tokens ----------------------------------------------------------- */
:root{
  --night:#071A33;
  --night-2:#0E2A4A;
  --grid-blue:#123A63;
  --gold:#E8B23A;
  --gold-soft:#F2D48A;
  --flag-blue:#2E7FD1;
  --flag-red:#E03A3A;
  --flag-green:#2FA36B;
  --cream:#F2EDE3;
  --grey:#C9D3DF;

  --ink:#F2EDE3;
  --ink-2:#C9D3DF;
  --ink-3:rgba(201,211,223,.62);
  --line:rgba(201,211,223,.16);
  --line-2:rgba(201,211,223,.34);
  --line-3:rgba(201,211,223,.58);

  --wrap:1240px;
  --gutter:clamp(16px,4vw,40px);
  --header-h:54px;

  --sp-1:8px; --sp-2:16px; --sp-3:24px; --sp-4:32px;
  --sp-5:48px; --sp-6:64px; --sp-7:96px;

  --fs-12:12px; --fs-14:14px; --fs-15:15px; --fs-18:18px;
  --fs-24:24px; --fs-36:36px; --fs-56:56px;

  --font-display:"HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","PingFang SC","Microsoft YaHei",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;

  --dur:220ms;
  --dur-slow:360ms;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* --- 03 base ------------------------------------------------------------- */
html,body{min-height:100%}
body{
  background-color:var(--night);
  background-image:
    linear-gradient(to right,rgba(201,211,223,.04) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(201,211,223,.04) 1px,transparent 1px);
  background-size:64px 64px,64px 64px;
  color:var(--ink);
  font-family:var(--font-display);
  font-size:var(--fs-15);
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
}
h1,h2,h3,h4{font-weight:900;letter-spacing:-.02em;line-height:1.14;margin:0 0 .6em}
h1{font-size:clamp(32px,6vw,56px)}
h2{font-size:clamp(24px,3.4vw,36px)}
h3{font-size:var(--fs-24)}
h4{font-size:var(--fs-18)}
strong{font-weight:700;color:#fff}
::selection{background:var(--gold);color:#08182E}
:focus-visible{outline:2px solid var(--gold);outline-offset:2px}
a:focus-visible,button:focus-visible{outline-offset:3px}

/* --- 04 typography utilities --------------------------------------------- */
.num{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.05em;
}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.05em}
.kicker{
  display:inline-flex;align-items:center;gap:8px;
  font-family:var(--font-mono);font-size:var(--fs-12);
  letter-spacing:.18em;color:var(--grey);text-transform:uppercase;
}
.rule{height:1px;border:0;background:var(--line-2);margin:var(--sp-5) 0}
.ruler{
  height:6px;
  background-image:repeating-linear-gradient(to right,var(--line-2) 0 1px,transparent 1px 12px);
}
.flag-texture{
  background-image:repeating-linear-gradient(135deg,rgba(46,127,209,.12) 0 1px,transparent 1px 12px);
}
.swatch{display:inline-block;width:6px;height:6px;flex:none;background:var(--cream);transition:transform var(--dur) var(--ease)}
.swatch--gold{background:var(--gold)}
.swatch--soft{background:var(--gold-soft)}
.swatch--blue{background:var(--flag-blue)}
.swatch--red{background:var(--flag-red)}
.swatch--green{background:var(--flag-green)}
.swatch--cream{background:var(--cream)}

/* --- 05 layout ----------------------------------------------------------- */
.container{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:860px}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(12px,2vw,24px)}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-9{grid-column:span 9}
.span-12{grid-column:span 12}

.section{padding-block:clamp(40px,7vw,88px)}
.section--tight{padding-block:clamp(24px,4vw,48px)}
.section--plate{background:var(--night-2);border-block:1px solid var(--line)}
.section-head{display:grid;gap:10px;margin-bottom:clamp(20px,3vw,36px)}
.section-head h2{margin:0}
.section-head p{margin:0;max-width:38em;font-size:var(--fs-14);color:var(--ink-2)}
.section-index{
  display:flex;align-items:center;gap:12px;
  font-family:var(--font-mono);font-size:var(--fs-12);
  letter-spacing:.2em;color:var(--gold);
}
.section-index::after{content:"";flex:1;height:1px;background:var(--line)}
.section-mark{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:var(--fs-12);
  letter-spacing:.2em;color:var(--grey);
}
.section-mark::before{content:"";width:2px;height:16px;background:var(--gold)}
.section-mark--blue::before{background:var(--flag-blue)}
.section-mark--red::before{background:var(--flag-red)}
.section-mark--green::before{background:var(--flag-green)}
.section-mark--soft::before{background:var(--gold-soft)}

/* --- 06 buttons ---------------------------------------------------------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  min-height:40px;padding:10px 18px;border:1px solid var(--line-2);
  background:transparent;color:var(--ink);
  font-family:var(--font-display);font-size:var(--fs-14);font-weight:700;
  letter-spacing:.02em;line-height:1;border-radius:0;cursor:pointer;
  transition:background-color 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--gold{background:var(--gold);border-color:var(--gold);color:#08182E}
.btn--gold:hover{background:var(--gold-soft);border-color:var(--gold-soft);color:#08182E}
.btn--ghost{color:var(--cream);border-color:var(--line-2)}
.btn--ghost:hover{border-color:var(--gold);color:var(--gold)}
.btn--block{display:flex;width:100%}

/* --- 07 breadcrumb / prose / table --------------------------------------- */
.breadcrumb{margin:var(--sp-4) 0 var(--sp-3)}
.breadcrumb ol{
  display:flex;flex-wrap:wrap;align-items:center;gap:0 10px;
  font-family:var(--font-mono);font-size:var(--fs-12);
  letter-spacing:.06em;color:var(--ink-3);
}
.breadcrumb li+li::before{content:"/";margin-right:10px;color:var(--line-3)}
.breadcrumb a{color:var(--grey);padding-bottom:1px;border-bottom:1px solid transparent}
.breadcrumb a:hover{color:var(--gold);border-bottom-color:var(--gold)}
.breadcrumb [aria-current="page"]{color:var(--cream)}

.prose{max-width:38em}
.prose p{margin:0 0 1.15em}
.prose h2{margin:1.6em 0 .6em}
.prose h3{margin:1.4em 0 .5em}
.prose ul{margin:0 0 1.15em;padding-left:1.1em;list-style:none}
.prose li{position:relative;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:-1.1em;top:.66em;width:6px;height:6px;background:var(--gold)}
.prose a{color:var(--gold-soft);border-bottom:1px solid rgba(232,178,58,.4)}
.prose a:hover{color:var(--gold);border-bottom-color:var(--gold)}

.data-table{width:100%;font-family:var(--font-mono);font-size:var(--fs-14);font-variant-numeric:tabular-nums}
.data-table th,.data-table td{padding:10px 12px;border-bottom:1px solid var(--line);text-align:left;white-space:nowrap}
.data-table thead th{
  font-size:var(--fs-12);font-weight:500;letter-spacing:.14em;
  color:var(--grey);border-bottom:1px solid var(--line-2);text-transform:uppercase;
}
.data-table tbody tr:nth-child(even){background:rgba(18,58,99,.35)}
.data-table tbody tr:hover{background:var(--grid-blue)}
.data-table .is-num{text-align:right;color:var(--cream)}

/* --- 08 frames & media --------------------------------------------------- */
.frame{position:relative;border:1px solid var(--line-2);background:rgba(14,42,74,.45);padding:clamp(20px,3vw,40px)}
.frame::before{content:"";position:absolute;inset:6px;border:1px solid var(--line);pointer-events:none}
.frame__ruler{
  position:absolute;left:0;right:0;top:0;height:8px;
  background-image:repeating-linear-gradient(to right,var(--line-2) 0 1px,transparent 1px 12px);
}
.media-frame{
  position:relative;display:block;width:100%;overflow:hidden;
  border:1px solid var(--line-2);background-color:var(--night-2);
  background-image:
    repeating-linear-gradient(135deg,rgba(46,127,209,.10) 0 1px,transparent 1px 12px),
    linear-gradient(180deg,rgba(14,42,74,.92),rgba(7,26,51,.92));
}
.media-frame img,.media-frame picture,.media-frame video,.media-frame svg{
  width:100%;height:100%;object-fit:cover;
}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--21x9{aspect-ratio:21/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--3x2{aspect-ratio:3/2}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame figcaption{
  position:absolute;left:0;right:0;bottom:0;padding:8px 12px;
  font-family:var(--font-mono);font-size:var(--fs-12);color:var(--grey);
  background:rgba(7,26,51,.78);border-top:1px solid var(--line);
}
.media-cap{
  display:block;padding:8px 0 0;
  font-family:var(--font-mono);font-size:var(--fs-12);color:var(--ink-3);
}

/* --- 09 header ----------------------------------------------------------- */
.skip-link{
  position:absolute;left:16px;top:-120px;z-index:120;
  padding:10px 16px;background:var(--gold);color:#08182E;
  font-size:var(--fs-14);font-weight:700;
  transition:top var(--dur) var(--ease);
}
.skip-link:focus{top:12px}

.site-header{position:relative;z-index:60;background:var(--night)}
.masthead{padding-block:clamp(18px,2.6vw,30px) clamp(12px,1.8vw,20px);border-bottom:1px solid var(--line)}
.masthead-inner{display:grid;grid-template-columns:1fr auto 1fr;align-items:end;gap:16px}
.masthead-brand{text-align:center}
.brand{
  display:inline-block;font-family:var(--font-display);
  font-size:clamp(30px,5.4vw,56px);font-weight:900;
  letter-spacing:-.02em;line-height:1;color:var(--cream);
  transition:color var(--dur) var(--ease);
}
.brand:hover{color:var(--gold)}
.brand-tagline{
  margin:10px 0 0;font-family:var(--font-mono);
  font-size:var(--fs-12);letter-spacing:.14em;color:var(--ink-3);
}
.masthead-note{
  display:flex;align-items:center;gap:8px;
  margin:0 0 6px;font-family:var(--font-mono);
  font-size:var(--fs-12);letter-spacing:.08em;color:var(--grey);
}
.masthead-note--right{justify-content:flex-end;text-align:right}

.site-nav{
  position:sticky;top:0;z-index:70;
  background:rgba(7,26,51,.95);
  border-bottom:1px solid var(--line-2);
}
@supports (backdrop-filter:blur(6px)){
  .site-nav{backdrop-filter:blur(8px)}
}
.site-nav::before{
  content:"";display:block;height:3px;
  background:linear-gradient(90deg,
    var(--flag-blue) 0 20%,
    var(--cream) 20% 40%,
    var(--flag-red) 40% 60%,
    var(--flag-green) 60% 80%,
    var(--gold) 80% 100%);
}
.nav-inner{
  display:grid;grid-template-columns:1fr auto 1fr;
  grid-template-areas:"toggle list cta";
  align-items:center;gap:10px;min-height:var(--header-h);
}
.nav-toggle{
  grid-area:toggle;display:none;align-items:center;gap:8px;
  min-height:38px;padding:8px 12px;cursor:pointer;
  border:1px solid var(--line-2);color:var(--cream);
  font-family:var(--font-mono);font-size:var(--fs-12);letter-spacing:.16em;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--gold);color:var(--gold)}
.nav-toggle-bars{position:relative;display:block;width:16px;height:1px;background:currentColor}
.nav-toggle-bars::before,.nav-toggle-bars::after{content:"";position:absolute;left:0;width:16px;height:1px;background:currentColor}
.nav-toggle-bars::before{top:-5px}
.nav-toggle-bars::after{top:5px}
.nav-list{
  grid-area:list;display:flex;flex-wrap:wrap;align-items:center;justify-content:center;
  gap:4px clamp(10px,1.8vw,26px);
}
.nav-link{
  display:inline-flex;align-items:center;gap:8px;padding:16px 2px;
  font-size:var(--fs-14);color:var(--grey);
  border-bottom:2px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.nav-link:hover{color:var(--cream);border-bottom-color:var(--line-3)}
.nav-link:hover .swatch{transform:translateX(3px)}
.nav-link[aria-current="page"]{color:var(--gold);font-weight:700;border-bottom-color:var(--gold)}
.nav-cta{grid-area:cta;justify-self:end}

/* --- 10 footer ----------------------------------------------------------- */
.site-footer{margin-top:var(--sp-7);background:var(--night-2);border-top:1px solid var(--line-2)}
.flag-strip{display:grid;grid-template-columns:repeat(5,1fr);height:4px}
.flag-strip span:nth-child(1){background:var(--flag-blue)}
.flag-strip span:nth-child(2){background:var(--cream)}
.flag-strip span:nth-child(3){background:var(--flag-red)}
.flag-strip span:nth-child(4){background:var(--flag-green)}
.flag-strip span:nth-child(5){background:var(--gold)}
.footer-grid{
  display:grid;grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));
  gap:clamp(24px,3vw,48px);padding-block:clamp(40px,6vw,72px);
}
.footer-brand-mark{
  display:inline-block;font-size:var(--fs-24);font-weight:900;
  letter-spacing:-.01em;color:var(--cream);
  transition:color var(--dur) var(--ease);
}
.footer-brand-mark:hover{color:var(--gold)}
.footer-summary{margin-top:14px;max-width:36em;font-size:var(--fs-14);color:var(--ink-2)}
.footer-contact{margin-top:18px;display:grid;gap:6px;font-family:var(--font-mono);font-size:var(--fs-12);letter-spacing:.04em;color:var(--grey)}
.footer-contact-key{display:inline-block;min-width:5em;color:var(--gold)}
.footer-note{margin-top:14px;max-width:40em;font-size:var(--fs-12);color:var(--ink-3)}
.footer-col-title{
  margin:0 0 14px;font-family:var(--font-mono);font-size:var(--fs-12);
  letter-spacing:.18em;color:var(--cream);
}
.footer-col-title::before{content:"";display:block;width:16px;height:2px;background:var(--gold);margin-bottom:10px}
.footer-links{display:grid;gap:10px}
.footer-links a{font-size:var(--fs-14);color:var(--grey);transition:color var(--dur) var(--ease)}
.footer-links a:hover{color:var(--gold)}
.footer-base{border-top:1px solid var(--line);padding-block:18px}
.footer-base-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:10px 24px;
  font-family:var(--font-mono);font-size:var(--fs-12);letter-spacing:.06em;color:var(--ink-3);
}
.footer-legal{margin:0}
.footer-icp{color:var(--grey)}
.footer-legal-links{display:flex;flex-wrap:wrap;gap:0 18px}
.footer-legal-links a{color:var(--grey);transition:color var(--dur) var(--ease)}
.footer-legal-links a:hover{color:var(--gold)}

/* --- 11 toc / progress / to-top ----------------------------------------- */
.toc{
  position:sticky;top:calc(var(--header-h) + 24px);
  font-family:var(--font-mono);font-size:var(--fs-12);
}
.toc__title{margin-bottom:12px;letter-spacing:.18em;color:var(--grey)}
.toc-list{display:grid;gap:2px;border-left:1px solid var(--line-2)}
.toc-list a{
  display:block;margin-left:-1px;padding:6px 0 6px 12px;
  color:var(--ink-3);border-left:2px solid transparent;
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.toc-list a:hover{color:var(--cream)}
.toc-list a.is-active{color:var(--gold);border-left-color:var(--gold)}

.scroll-progress{
  position:fixed;top:0;left:0;height:3px;width:0;z-index:90;
  background:linear-gradient(90deg,var(--flag-blue),var(--flag-green),var(--gold));
  transition:width 120ms linear;pointer-events:none;
}
.to-top{
  position:fixed;right:clamp(16px,3vw,32px);bottom:clamp(16px,3vw,32px);z-index:80;
  display:grid;place-items:center;width:44px;height:44px;
  background:var(--night-2);color:var(--cream);border:1px solid var(--line-2);
  font-family:var(--font-mono);font-size:var(--fs-18);line-height:1;cursor:pointer;
  opacity:0;visibility:hidden;transform:translateY(8px);
  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]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--gold);color:var(--gold)}

/* --- 12 reveal ----------------------------------------------------------- */
.js [data-reveal]{opacity:0;transform:translateY(10px)}
.js [data-reveal].is-in{
  opacity:1;transform:none;
  transition:opacity var(--dur-slow) var(--ease),transform var(--dur-slow) var(--ease);
}

/* --- 13 responsive ------------------------------------------------------- */
@media (max-width:1080px){
  .nav-link{font-size:var(--fs-12)}
  .nav-cta{padding-inline:14px;font-size:var(--fs-12)}
}
@media (max-width:900px){
  .grid-12 .span-3,.grid-12 .span-4,.grid-12 .span-5,
  .grid-12 .span-6,.grid-12 .span-7,.grid-12 .span-8,
  .grid-12 .span-9{grid-column:span 12}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}
@media (max-width:860px){
  .masthead-inner{grid-template-columns:1fr;align-items:center;gap:12px}
  .masthead-note{margin:0;justify-content:center;text-align:center}
  .masthead-note--right{justify-content:center;text-align:center}
  .nav-inner{
    grid-template-columns:1fr auto;
    grid-template-areas:"toggle toggle" "list list" "cta cta";
    padding-block:8px;gap:0;
  }
  .nav-toggle{display:inline-flex;justify-self:start}
  .nav-list{display:none;flex-direction:column;align-items:stretch;gap:0;margin-top:10px;border-top:1px solid var(--line)}
  .site-nav[data-open] .nav-list{display:flex;padding-bottom:8px}
  .nav-link{justify-content:flex-start;padding:14px 12px;border-bottom:1px solid var(--line);border-left:2px solid transparent}
  .nav-link:hover{border-left-color:var(--line-3);border-bottom-color:var(--line)}
  .nav-link[aria-current="page"]{border-left-color:var(--gold);border-bottom-color:var(--line)}
  .nav-cta{display:none}
  .site-nav[data-open] .nav-cta{display:inline-flex;justify-self:stretch;width:100%;margin-top:12px}
}
@media (max-width:640px){
  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-base-inner{flex-direction:column;align-items:flex-start}
  .masthead-note{flex-wrap:wrap;justify-content:center}
}

/* --- 14 focus & reduced motion ------------------------------------------ */
a:hover{color:var(--gold-soft)}
@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;
  }
  .js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
  .nav-link:hover .swatch{transform:none}
  .to-top{transform:none}
}