/* =========================================================
   竞博中心 · 共享外壳样式 /assets/site.css
   深炭黑导航台 · 侧边品牌轨道 · 版本日期条 · 荧光绿状态点
   ========================================================= */

/* ---------- 01 reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,blockquote,dl,dd,hr{margin:0}
ul,ol{list-style:none;padding:0}
img,svg,video{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
:target{scroll-margin-top:118px}

/* ---------- 02 tokens ---------- */
:root{
  --ink:#0B0D11;
  --graphite:#171B22;
  --silver:#C9CFD8;
  --slate:#7E8794;
  --parchment:#F1EAD9;
  --umber:#241A14;
  --red:#FF3B2F;
  --blue:#2E7DFF;
  --red-press:#8C1D14;
  --green:#86FF6E;

  --rail-w:88px;
  --bar-h:32px;
  --mast-h:68px;
  --shell-x:clamp(20px,3.2vw,56px);

  --line:rgba(201,207,216,.13);
  --line-strong:rgba(201,207,216,.3);

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

  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 03 base ---------- */
body{
  min-height:100vh;
  padding-left:var(--rail-w);
  background-color:var(--ink);
  background-image:
    linear-gradient(rgba(201,207,216,.042) 1px,transparent 1px),
    linear-gradient(90deg,rgba(201,207,216,.042) 1px,transparent 1px);
  background-size:76px 76px;
  color:var(--silver);
  font-family:var(--font-body);
  font-size:17px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}
body.nav-open{overflow:hidden}

h1,h2,h3,h4{
  font-family:var(--font-display);
  font-weight:800;
  font-stretch:88%;
  letter-spacing:-.02em;
  line-height:1.08;
  color:#fff;
}
h1{font-size:clamp(2.4rem,6vw,5.2rem);font-weight:900;letter-spacing:-.03em}
h2{font-size:clamp(1.5rem,3vw,2.4rem)}
h3{font-size:clamp(1.15rem,1.6vw,1.5rem)}

:focus-visible{outline:2px solid var(--green);outline-offset:2px}

/* ---------- 04 utilities ---------- */
.mono{font-family:var(--font-mono);font-size:13px;letter-spacing:.04em}
.eyebrow{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--slate);
}
.eyebrow--green{color:var(--green)}
.visually-hidden{
  position:absolute!important;width:1px;height:1px;overflow:hidden;
  clip:rect(0 0 0 0);clip-path:inset(50%);white-space:nowrap;
}
.container{width:100%;max-width:1240px;margin-inline:auto;padding-inline:var(--shell-x)}
.stack>*+*{margin-top:var(--stack-gap,18px)}
.section{padding-block:clamp(44px,6vw,88px)}
.section--tight{padding-block:clamp(28px,4vw,52px)}
.section-head{
  display:flex;flex-wrap:wrap;gap:10px 24px;align-items:baseline;justify-content:space-between;
  padding-bottom:14px;margin-bottom:clamp(20px,3vw,36px);
  border-bottom:1px solid var(--line);
}
.grid{display:grid;gap:clamp(16px,2vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--7-5{grid-template-columns:7fr 5fr}
.grid--5-7{grid-template-columns:5fr 7fr}

.pulse-dot{
  display:inline-block;width:7px;height:7px;border-radius:50%;
  background:var(--green);
  box-shadow:0 0 0 0 rgba(134,255,110,.45);
  animation:pulse 4s ease-in-out infinite;
  flex:none;
}
@keyframes pulse{
  0%,100%{opacity:.45;box-shadow:0 0 0 0 rgba(134,255,110,.35)}
  50%{opacity:1;box-shadow:0 0 0 6px rgba(134,255,110,0)}
}

[data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
[data-reveal][data-visible]{opacity:1;transform:none}

/* ---------- 05 buttons / chips / tags ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 18px;
  border:1px solid transparent;
  font-size:14px;font-weight:600;letter-spacing:.02em;
  transition:background-color .18s var(--ease),color .18s var(--ease),border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:active{transform:translateY(1px)}
.btn--sm{padding:8px 13px;font-size:12.5px}
.btn--primary{background:var(--red);color:#fff}
.btn--primary:hover{background:#FF554A}
.btn--primary:active{background:var(--red-press)}
.btn--ghost{
  border-color:rgba(46,125,255,.55);
  background:rgba(46,125,255,.1);
  color:#D6E5FF;
}
.btn--ghost:hover{background:rgba(46,125,255,.22);border-color:var(--blue);color:#fff}
.btn--quiet{border-color:var(--line);color:var(--slate)}
.btn--quiet:hover{color:var(--silver);border-color:var(--line-strong)}

.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 12px;
  border:1px solid var(--line);
  background:rgba(201,207,216,.03);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  color:var(--slate);
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.chip:hover{color:var(--silver);border-color:var(--line-strong)}
.chip[aria-pressed="true"]{background:var(--blue);border-color:var(--blue);color:#06101F}

.filter-bar{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.filter-bar__label{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--slate);margin-right:4px;
}
[data-filter-item][data-filtered="out"]{display:none}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 9px;
  border:1px solid var(--line-strong);
  background:rgba(201,207,216,.04);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;
  color:var(--silver);
}
.tag--green{background:var(--green);border-color:var(--green);color:#06110A}
.tag--red{background:var(--red-press);border-color:rgba(255,59,47,.5);color:#fff}
.tag--blue{background:rgba(46,125,255,.16);border-color:rgba(46,125,255,.5);color:#DCE9FF}

/* ---------- 06 cards / prose ---------- */
.card{
  position:relative;
  background:var(--graphite);
  border:1px solid var(--line);
  padding:clamp(18px,2.2vw,28px);
}
.card--paper{background:var(--parchment);color:var(--umber);border-color:rgba(36,26,20,.22)}
.card--paper h2,.card--paper h3{color:var(--umber)}
.card--umber{background:var(--umber);border-color:rgba(241,234,217,.16);color:#E8DECC}
.card--accent::before{
  content:"";position:absolute;left:-1px;top:-1px;width:38px;height:3px;background:var(--red);
}

.prose{max-width:68ch;font-size:17px;line-height:1.75;color:var(--silver)}
.prose>*+*{margin-top:1em}
.prose h2{margin-top:2.2em;margin-bottom:.5em}
.prose h3{margin-top:1.8em;margin-bottom:.4em}
.prose a{color:var(--blue);border-bottom:1px solid rgba(46,125,255,.45)}
.prose a:hover{border-bottom-color:var(--blue)}

.breadcrumb{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--slate)}
.breadcrumb ol{display:flex;flex-wrap:wrap;gap:8px;align-items:center}
.breadcrumb li+li::before{content:"/";margin-right:8px;color:rgba(201,207,216,.3)}
.breadcrumb a:hover{color:var(--silver)}
.breadcrumb [aria-current="page"]{color:var(--green)}

/* ---------- 07 media frame（图片占位基础规则） ---------- */
.media-frame{
  position:relative;
  overflow:hidden;
  isolation:isolate;
  background-color:var(--graphite);
  border:1px solid var(--line);
}
.media-frame::before{
  content:"";position:absolute;inset:0;z-index:0;
  background-image:
    radial-gradient(120% 90% at 12% 112%,rgba(46,125,255,.30),transparent 62%),
    radial-gradient(70% 60% at 94% -10%,rgba(255,59,47,.18),transparent 60%),
    repeating-linear-gradient(90deg,rgba(201,207,216,.10) 0 1px,transparent 1px 30px),
    repeating-linear-gradient(0deg,rgba(201,207,216,.07) 0 1px,transparent 1px 30px);
}
.media-frame::after{
  content:"";position:absolute;left:14px;top:14px;width:8px;height:8px;z-index:2;
  background:var(--green);opacity:.85;
}
.media-frame>img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.media-frame--21x9{aspect-ratio:21/9}
.media-frame--16x9{aspect-ratio:16/9}
.media-frame--4x3{aspect-ratio:4/3}
.media-frame--1x1{aspect-ratio:1/1}
.media-frame--tall{aspect-ratio:3/4}
.media-cap{
  display:block;margin-top:10px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;color:var(--slate);
}

/* ---------- 08 main ---------- */
main{padding-top:calc(var(--bar-h) + var(--mast-h));display:block}
.site-main{display:block;width:100%;min-height:50vh}

/* ---------- 09 skip link ---------- */
.skip-link{
  position:fixed;z-index:200;top:8px;left:50%;
  transform:translate(-50%,-190%);
  padding:10px 20px;
  background:var(--red);color:#fff;
  font-size:13.5px;font-weight:600;letter-spacing:.06em;
  transition:transform .2s var(--ease);
}
.skip-link:focus{transform:translate(-50%,0)}

/* ---------- 10 brand rail ---------- */
.brand-rail{
  position:fixed;top:0;left:0;bottom:0;z-index:90;
  width:var(--rail-w);
  display:flex;flex-direction:column;align-items:center;gap:14px;
  padding:16px 0 20px;
  background:linear-gradient(180deg,#101520 0%,#0B0D11 44%,#080A0E 100%);
  border-right:1px solid var(--line);
}
.brand-rail::before{
  content:"";position:absolute;top:0;left:50%;transform:translateX(-50%);
  width:2px;height:56px;background:var(--red);
}
.rail-mark{display:flex;flex-direction:column;align-items:center;gap:10px;padding-top:14px}
.rail-mark__text{
  writing-mode:vertical-rl;
  font-family:var(--font-display);font-weight:900;font-size:19px;letter-spacing:.26em;
  color:#fff;line-height:1;
}
.rail-mark__en{
  writing-mode:vertical-rl;
  font-size:9.5px;letter-spacing:.42em;text-transform:uppercase;color:var(--slate);
}
.rail-version{
  font-size:10.5px;letter-spacing:.1em;color:var(--green);
  border:1px solid rgba(134,255,110,.35);
  background:rgba(134,255,110,.07);
  padding:5px 6px;
}
.rail-links{
  display:flex;flex-direction:column;align-items:center;gap:8px;
  width:100%;margin-top:auto;
}
.rail-link{
  display:flex;flex-direction:column;align-items:center;gap:3px;
  width:calc(var(--rail-w) - 18px);
  padding:9px 0;
  border:1px solid var(--line);
  color:var(--slate);
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.rail-link:hover{color:#fff;border-color:var(--line-strong);background:rgba(201,207,216,.05)}
.rail-link__key{font-size:9.5px;letter-spacing:.14em;color:var(--green);opacity:.75}
.rail-link__label{font-size:12.5px;letter-spacing:.06em}
.rail-cta{
  width:calc(var(--rail-w) - 18px);
  text-align:center;
  padding:10px 0;
  background:var(--red);color:#fff;
  font-size:12.5px;font-weight:600;letter-spacing:.06em;
  transition:background-color .18s var(--ease);
}
.rail-cta:hover{background:#FF554A}
.rail-cta:active{background:var(--red-press)}

/* ---------- 11 version bar ---------- */
.version-bar{
  position:fixed;top:0;left:var(--rail-w);right:0;z-index:75;
  height:var(--bar-h);
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding-inline:clamp(14px,2vw,28px);
  background:rgba(11,13,17,.9);
  border-bottom:1px solid var(--line);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.05em;
  color:var(--slate);
  backdrop-filter:blur(8px);
  transition:height .24s var(--ease),background-color .24s var(--ease);
}
.site-header[data-scrolled] .version-bar{height:28px;background:rgba(11,13,17,.98)}
.version-bar__left{display:inline-flex;align-items:center;gap:8px;white-space:nowrap}
.version-bar__left .mono{color:var(--silver)}
.version-bar__right{white-space:nowrap;color:var(--slate)}

/* ---------- 12 masthead / nav ---------- */
.masthead{
  position:fixed;top:var(--bar-h);left:var(--rail-w);right:0;z-index:72;
  background:linear-gradient(180deg,rgba(11,13,17,.8),rgba(11,13,17,0));
  border-bottom:1px solid transparent;
  transition:top .24s var(--ease),background-color .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.site-header[data-scrolled] .masthead{
  top:28px;
  background:rgba(11,13,17,.97);
  border-bottom-color:var(--line);
  box-shadow:0 20px 44px -32px rgba(0,0,0,.95);
  backdrop-filter:blur(10px);
}
.masthead__inner{
  max-width:1240px;margin-inline:auto;
  height:var(--mast-h);
  display:flex;align-items:center;gap:clamp(12px,2vw,28px);
  padding-inline:var(--shell-x);
}
.masthead__tag{
  font-size:11px;letter-spacing:.24em;text-transform:uppercase;
  color:var(--slate);white-space:nowrap;
}

.primary-nav{display:flex;align-items:center;gap:clamp(10px,2vw,30px);margin-left:auto;min-width:0}
.primary-nav__list{display:flex;align-items:center;gap:2px}
.primary-nav__list a{
  position:relative;display:inline-block;
  padding:9px 12px;
  font-size:14.5px;letter-spacing:.02em;
  color:rgba(201,207,216,.82);
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.primary-nav__list a::after{
  content:"";position:absolute;left:10px;right:10px;bottom:4px;height:2px;
  background:var(--red);
  transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.primary-nav__list a:hover{color:#fff;background:rgba(201,207,216,.06)}
.primary-nav__list a:hover::after{transform:scaleX(1)}
.primary-nav__list a[aria-current="page"]{color:#fff;background:rgba(201,207,216,.08)}
.primary-nav__list a[aria-current="page"]::after{transform:scaleX(1);background:var(--red)}

.nav-utility{
  display:flex;align-items:center;gap:clamp(10px,1.6vw,20px);
  padding-left:clamp(10px,1.6vw,20px);
  border-left:1px solid var(--line);
}
.nav-utility__list{display:flex;align-items:center;gap:14px}
.nav-utility__list a{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  color:var(--slate);white-space:nowrap;
  transition:color .18s var(--ease);
}
.nav-utility__list a:hover{color:var(--blue)}
.nav-actions{display:flex;align-items:center;gap:8px}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  height:40px;padding:0 12px;margin-left:auto;
  border:1px solid var(--line-strong);
  background:rgba(201,207,216,.04);
  color:var(--silver);
}
.nav-toggle:hover{background:rgba(201,207,216,.1)}
.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;
  transition:transform .24s var(--ease);
}
.nav-toggle__bars::before{top:-6px}
.nav-toggle__bars::after{top:6px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars{background:transparent}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-6px) rotate(-45deg)}
.nav-toggle__text{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em}

.scroll-progress{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;
  transform:scaleX(var(--progress,0));transform-origin:left;
  background:linear-gradient(90deg,var(--red),var(--blue) 58%,var(--green));
  transition:transform .12s linear;
}

.pointer-glow{
  position:fixed;inset:0;z-index:3;pointer-events:none;
  opacity:0;
  background:radial-gradient(420px circle at var(--px,50%) var(--py,50%),rgba(46,125,255,.13),transparent 68%);
  transition:opacity .6s var(--ease);
}
.pointer-glow[data-active]{opacity:1}

/* ---------- 13 footer ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(40px,6vw,80px);
  background:var(--graphite);
  border-top:1px solid var(--line-strong);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;width:min(240px,38vw);height:2px;background:var(--red);
}
.footer-inner{
  max-width:1240px;margin-inline:auto;
  padding:clamp(36px,5vw,68px) var(--shell-x) 26px;
}
.footer-top{
  display:grid;grid-template-columns:minmax(220px,1fr) 2.6fr;
  gap:clamp(28px,4vw,56px);
  padding-bottom:clamp(26px,3vw,44px);
  border-bottom:1px solid var(--line);
}
.footer-brand__mark{
  display:inline-block;
  font-family:var(--font-display);font-weight:900;font-size:26px;letter-spacing:-.02em;
  color:#fff;
}
.footer-brand__mark:hover{color:var(--green)}
.footer-brand__line{margin-top:10px;font-size:14px;color:var(--slate)}
.footer-version{
  display:inline-flex;align-items:center;gap:8px;
  margin-top:16px;
  font-size:12px;color:var(--green);
}
.footer-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:clamp(20px,3vw,36px)}
.footer-col__title{
  font-family:var(--font-mono);font-size:11px;font-weight:600;
  letter-spacing:.18em;text-transform:uppercase;color:var(--silver);
  margin-bottom:14px;
}
.footer-links li+li{margin-top:9px}
.footer-links a{font-size:14.5px;color:var(--slate);transition:color .18s var(--ease)}
.footer-links a:hover{color:#fff}
.footer-links a[aria-current="page"]{color:var(--green)}
.footer-meta li{font-size:12px;line-height:1.9;color:var(--slate);word-break:break-word}
.footer-meta li+li{margin-top:2px}
.footer-col--contact .footer-meta li:first-child{color:var(--silver)}

.footer-bottom{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;padding-top:22px;
}
.footer-legal,
.footer-year{font-size:11.5px;color:var(--slate)}
.footer-signoff{display:inline-flex;align-items:center;gap:8px;font-size:12px;color:var(--silver)}

/* ---------- 14 responsive ---------- */
@media (max-width:1180px){
  .masthead__tag{display:none}
  .nav-utility__list{display:none}
}
@media (max-width:1024px){
  .nav-toggle{display:inline-flex}
  .primary-nav{
    position:fixed;top:0;left:var(--rail-w);right:0;bottom:0;z-index:62;
    display:flex;flex-direction:column;align-items:stretch;gap:0;
    margin-left:0;
    padding:calc(var(--bar-h) + var(--mast-h) + 18px) clamp(18px,6vw,40px) 44px;
    background:linear-gradient(160deg,#12161E 0%,#0B0D11 58%);
    border-left:1px solid var(--line);
    overflow-y:auto;
    transform:translateX(102%);opacity:0;visibility:hidden;
    transition:transform .32s var(--ease),opacity .32s var(--ease),visibility .32s var(--ease);
  }
  .primary-nav[data-open]{transform:translateX(0);opacity:1;visibility:visible}
  .primary-nav__list{flex-direction:column;align-items:stretch;gap:0;border-top:1px solid var(--line)}
  .primary-nav__list li{border-bottom:1px solid var(--line)}
  .primary-nav__list a{
    display:flex;align-items:center;justify-content:space-between;
    padding:16px 4px;font-size:19px;
    font-family:var(--font-display);font-weight:800;letter-spacing:-.01em;
  }
  .primary-nav__list a::after{left:4px;right:auto;width:26px;bottom:8px}
  .nav-utility{flex-direction:column;align-items:stretch;gap:20px;padding-left:0;border-left:0;margin-top:28px}
  .nav-utility__list{display:flex;flex-wrap:wrap;gap:8px}
  .nav-utility__list a{
    display:inline-flex;padding:10px 14px;border:1px solid var(--line);color:var(--silver);
  }
  .nav-actions{flex-direction:column;align-items:stretch;gap:10px}
  .nav-actions .btn{width:100%}
}
@media (max-width:900px){
  .grid--2,.grid--3,.grid--7-5,.grid--5-7{grid-template-columns:1fr}
  .footer-top{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:720px){
  :root{--rail-w:56px;--mast-h:58px;--shell-x:16px}
  body{font-size:16px}
  .rail-mark__text{font-size:16px;letter-spacing:.2em}
  .rail-mark__en{display:none}
  .rail-version{font-size:9.5px;padding:4px 5px}
  .rail-link{padding:7px 0}
  .rail-link__label{font-size:11.5px}
  .rail-link__key{font-size:9px}
  .rail-cta{font-size:11.5px;padding:9px 0}
  .nav-toggle__text{display:none}
  .nav-toggle{padding:0 11px}
  .version-bar__right{font-size:10px}
  .version-bar{font-size:10.5px}
}
@media (max-width:560px){
  .footer-nav{grid-template-columns:1fr}
  .footer-bottom{flex-direction:column;align-items:flex-start}
}

/* ---------- 15 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;
  }
  [data-reveal]{opacity:1!important;transform:none!important}
  .pointer-glow{display:none}
  .primary-nav{transition:none}
}