/* KI赛场 · 全站共享样式 /assets/site.css */
:root{
  --ink:#070C0B;
  --deep:#0E2420;
  --layer:#14312B;
  --lime:#C8FF3D;
  --orange:#FF6A2B;
  --red:#D62F3A;
  --violet:#5B4B8A;
  --bone:#F2F4EF;
  --gray:#8A9691;
  --line:rgba(242,244,239,.12);
  --line-2:rgba(242,244,239,.22);
  --s1:8px; --s2:16px; --s3:24px; --s4:32px; --s5:48px; --s6:72px; --s7:112px;
  --wrap:1280px;
  --gutter:clamp(16px,4vw,40px);
  --measure:36em;
  --radius:3px;
  --mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono",monospace;
  --sans:"PingFang SC","HarmonyOS Sans SC","Source Han Sans SC","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --serif:"Songti SC","Source Han Serif SC","Noto Serif SC",Georgia,"Times New Roman",serif;
  --shadow:0 22px 50px -36px rgba(0,0,0,.95),0 1px 0 rgba(242,244,239,.05);
}
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body{
  margin:0;
  font-family:var(--sans);
  font-size:16px;
  line-height:1.8;
  color:var(--bone);
  background-color:var(--ink);
  background-image:
    radial-gradient(1100px 620px at 78% -12%,rgba(200,255,61,.07),transparent 62%),
    linear-gradient(118deg,rgba(14,36,32,.9) 0%,rgba(7,12,11,0) 52%),
    repeating-linear-gradient(90deg,rgba(242,244,239,.03) 0 1px,transparent 1px 72px);
  background-repeat:no-repeat,no-repeat,repeat;
}
h1,h2,h3,h4,h5,h6,p,figure,ul,ol{margin:0}
ul,ol{padding:0;list-style:none}
img,video,svg{display:block;max-width:100%}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit}
main{display:block}
#main-content{scroll-margin-top:120px}
::selection{background:rgba(200,255,61,.28);color:var(--bone)}
:focus-visible{outline:2px solid var(--lime);outline-offset:2px}

/* ---------- 通用动作与按钮 ---------- */
.ki-btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 20px;border:1px solid var(--line-2);border-radius:var(--radius);
  background:transparent;color:var(--bone);
  font-size:14px;font-weight:700;letter-spacing:.08em;line-height:1.2;
  cursor:pointer;transition:background-color .18s ease,color .18s ease,border-color .18s ease;
}
.ki-btn:hover{border-color:var(--lime);color:var(--lime)}
.ki-btn--primary{background:var(--lime);border-color:var(--lime);color:#08120E}
.ki-btn--primary:hover{background:#D6FF6E;color:#08120E}
.ki-btn--ghost{color:var(--bone);border-color:var(--line-2)}
.ki-btn--sm{padding:7px 14px;font-size:12px;letter-spacing:.1em}

.ki-action{
  position:relative;display:inline-flex;align-items:center;gap:7px;
  padding:4px 0;border-bottom:1px solid transparent;
  color:var(--gray);font-size:13px;font-weight:700;letter-spacing:.06em;white-space:nowrap;
  transition:color .18s ease,border-color .18s ease;
}
.ki-action:hover{color:var(--bone)}
.ki-action.is-active,.ki-action[aria-current="true"]{color:var(--lime);border-bottom-color:var(--lime)}
.ki-action--key{color:var(--lime)}
.ki-action--key:hover{color:#DFFF8C}
.ki-action__dot{
  width:6px;height:6px;border-radius:50%;background:var(--lime);
  box-shadow:0 0 0 4px rgba(200,255,61,.14);flex:0 0 auto;
}

/* ---------- 顶部外框 ---------- */
.skip-link{
  position:fixed;top:-120px;left:16px;z-index:120;
  padding:10px 18px;background:var(--lime);color:#08120E;
  font-size:14px;font-weight:700;letter-spacing:.06em;
  border-radius:0 0 var(--radius) var(--radius);
  transition:top .2s ease;
}
.skip-link:focus{top:0}
.site-header{
  position:sticky;top:0;z-index:60;
  background:linear-gradient(180deg,rgba(7,12,11,.98),rgba(7,12,11,.9));
  border-bottom:1px solid var(--line);
}
.header-rail,
.header-frame,
.footer-grid,
.footer-base{
  max-width:var(--wrap);margin:0 auto;
  border-left:1px solid var(--line);border-right:1px solid var(--line);
}
.header-rail{
  display:flex;align-items:center;gap:var(--s3);
  padding:14px var(--gutter);
  border-bottom:1px solid var(--line);
}
.brand{display:inline-flex;align-items:center;gap:12px;flex:0 0 auto}
.brand-mark{
  width:26px;height:26px;flex:0 0 auto;background:var(--lime);
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:20px;font-weight:800;letter-spacing:.08em}
.brand-sub{
  font-family:var(--mono);font-size:10px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--gray);
}
.brand-line{
  font-family:var(--serif);font-size:13px;line-height:1.6;
  color:rgba(242,244,239,.6);
  padding-left:var(--s3);border-left:1px solid var(--line);
}
.rail-tools{margin-left:auto;display:flex;align-items:center;gap:10px}
.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 13px;background:transparent;border:1px solid var(--line-2);
  border-radius:var(--radius);color:var(--bone);
  font-size:12px;font-weight:700;letter-spacing:.14em;cursor:pointer;
}
.nav-toggle:hover{border-color:var(--lime)}
.nav-toggle-box{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-box span{display:block;height:1px;background:var(--lime)}
.nav-toggle-box span:nth-child(2){width:68%;transition:width .18s ease}
.site-header[data-open] .nav-toggle-box span:nth-child(2){width:100%}
.header-frame{
  display:flex;align-items:center;justify-content:space-between;
  gap:var(--s3);padding:0 var(--gutter);
}
.site-nav{min-width:0}
.nav-list{display:flex;align-items:center;gap:clamp(14px,2.4vw,32px)}
.nav-item{flex:0 0 auto}
.nav-link{
  display:block;padding:16px 2px;
  border-bottom:2px solid transparent;
  color:var(--gray);font-size:14px;font-weight:700;letter-spacing:.1em;
  transition:color .18s ease,border-color .18s ease;
}
.nav-link:hover{color:var(--bone)}
.nav-link[aria-current="page"]{color:var(--bone);border-bottom-color:var(--lime)}
.header-actions{display:flex;align-items:center;gap:clamp(10px,1.8vw,22px)}
.scroll-meter{
  position:absolute;left:0;bottom:-1px;width:100%;height:2px;
  background:var(--lime);transform:scaleX(0);transform-origin:0 50%;
}
.site-header.is-stuck .header-rail{padding-top:8px;padding-bottom:8px}
.site-header.is-stuck .nav-link{padding-top:11px;padding-bottom:11px}
.site-header.is-stuck .brand-sub,
.site-header.is-stuck .brand-line{display:none}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:var(--s7);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg,var(--deep) 0%,var(--ink) 88%);
}
.footer-grid{
  display:grid;grid-template-columns:repeat(4,minmax(0,1fr));
  gap:var(--s4);
  padding:var(--s6) var(--gutter) var(--s5);
}
.footer-seg{min-width:0}
.footer-title{
  display:flex;align-items:center;gap:9px;
  margin-bottom:16px;
  font-family:var(--mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--gray);
}
.footer-title::before{content:"";width:14px;height:1px;background:var(--lime);flex:0 0 auto}
.footer-actions,.footer-links{display:grid;gap:10px}
.footer-actions .ki-action{font-size:14px;justify-self:start}
.footer-links a{
  font-size:14px;color:rgba(242,244,239,.78);
  transition:color .18s ease;
}
.footer-links a:hover{color:var(--lime)}
.footer-contact{display:grid;gap:10px}
.footer-contact li{
  display:flex;gap:10px;font-size:14px;
  color:rgba(242,244,239,.78);word-break:break-all;
}
.contact-label{
  flex:0 0 auto;min-width:44px;padding-top:3px;
  font-family:var(--mono);font-size:11px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gray);
}
.footer-note{
  margin-top:16px;padding-left:12px;
  border-left:1px solid var(--line-2);
  font-family:var(--serif);font-size:13px;line-height:1.8;
  color:var(--gray);
}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;
  padding:18px var(--gutter) 34px;
  border-top:1px solid var(--line);
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--gray);
}
.footer-sign{color:var(--bone)}

/* ---------- 页面通用组件 ---------- */
.ki-main{padding-bottom:var(--s5)}
.ki-container{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:var(--gutter)}
.ki-section{padding-block:clamp(32px,6vw,72px)}
.ki-rule{height:1px;background:var(--line);border:0}
.ki-prose{max-width:var(--measure);color:rgba(242,244,239,.86);line-height:1.85}
.ki-prose p{margin-bottom:1.1em}
.ki-prose a{color:var(--lime);text-decoration:underline;text-underline-offset:3px}
.ki-crumb{
  display:flex;flex-wrap:wrap;gap:8px;margin-bottom:24px;
  font-family:var(--mono);font-size:12px;letter-spacing:.1em;color:var(--gray);
}
.ki-crumb a{color:var(--gray)}
.ki-crumb a:hover{color:var(--bone)}
.ki-crumb li+li::before{content:"/";margin-right:8px;color:var(--line-2)}
.ki-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px;padding-bottom:14px;margin-bottom:24px;border-bottom:1px solid var(--line);
}
.ki-kicker{
  font-family:var(--mono);font-size:11px;letter-spacing:.24em;
  text-transform:uppercase;color:var(--lime);
}
.ki-title{
  margin-top:8px;
  font-size:clamp(28px,4.6vw,44px);line-height:1.14;
  font-weight:800;letter-spacing:-.01em;
}
.ki-lede{
  max-width:34em;margin-top:12px;
  font-family:var(--serif);font-size:16px;line-height:1.9;
  color:rgba(242,244,239,.78);
}
.ki-grid{display:grid;gap:var(--s3)}
.ki-grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.ki-grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.ki-grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.ki-card{
  position:relative;padding:20px;
  background:var(--deep);border:1px solid var(--line);border-radius:var(--radius);
  box-shadow:var(--shadow);
  transition:transform .2s ease,border-color .2s ease,background-color .2s ease;
}
.ki-card:hover{transform:translateY(-2px);border-color:var(--line-2);background:var(--layer)}
.ki-num{
  font-family:var(--mono);font-size:2.4em;font-weight:700;
  letter-spacing:-.02em;line-height:1;color:var(--lime);
}
.ki-metric{
  display:flex;align-items:baseline;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:.14em;
  text-transform:uppercase;color:var(--gray);
}
.ki-tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--line-2);border-radius:999px;
  font-family:var(--mono);font-size:11px;letter-spacing:.12em;
  text-transform:uppercase;color:var(--gray);
}
.ki-tag--live{color:var(--lime);border-color:rgba(200,255,61,.5);background:rgba(200,255,61,.08)}
.ki-tag--soon{color:var(--orange);border-color:rgba(255,106,43,.45);background:rgba(255,106,43,.08)}
.ki-tag--done{color:#E8909A;border-color:rgba(214,47,58,.45);background:rgba(214,47,58,.1)}
.ki-tag--node{color:#C6BBEC;border-color:rgba(91,75,138,.6);background:rgba(91,75,138,.2)}
.ki-filter{display:flex;flex-wrap:wrap;gap:8px}
.ki-filter-btn{
  padding:7px 14px;background:transparent;
  border:1px solid var(--line);border-radius:999px;
  color:var(--gray);font-size:12px;font-weight:700;letter-spacing:.1em;
  cursor:pointer;transition:color .18s ease,background-color .18s ease,border-color .18s ease;
}
.ki-filter-btn:hover{color:var(--bone);border-color:var(--line-2)}
.ki-filter-btn.is-active{background:var(--lime);border-color:var(--lime);color:#08120E}
.ki-media{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(135deg,var(--layer) 0%,var(--ink) 72%);
}
.ki-media img{width:100%;height:100%;object-fit:cover}
.ki-media--wide{aspect-ratio:21/9}
.ki-media--tall{aspect-ratio:3/4}
.ki-media__tag{position:absolute;top:10px;left:10px;z-index:1}
.ki-media__caption{
  position:absolute;left:0;right:0;bottom:0;padding:10px 14px;
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;
  color:rgba(242,244,239,.82);
  background:linear-gradient(0deg,rgba(7,12,11,.94),transparent);
}
[data-collapse][data-collapsed] > [data-collapse-body]{display:none}
[data-reveal]{opacity:0;transform:translateY(14px);transition:opacity .5s ease,transform .5s ease}
[data-reveal].is-in{opacity:1;transform:none}

/* ---------- 平板 ---------- */
@media (max-width:1080px){
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));gap:var(--s4) var(--s3)}
  .ki-grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .ki-grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .brand-line{display:none}
  .nav-toggle{display:inline-flex}
  .header-frame{
    display:none;flex-direction:column;align-items:stretch;
    padding:4px var(--gutter) 18px;
  }
  .site-header[data-open] .header-frame{display:flex}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-link{padding:14px 0;border-bottom:1px solid var(--line)}
  .nav-link[aria-current="page"]{
    border-bottom-color:var(--line);
    border-left:3px solid var(--lime);padding-left:10px;
  }
  .header-actions{
    flex-wrap:wrap;gap:10px 20px;
    margin-top:14px;padding-top:14px;border-top:1px solid var(--line);
  }
  .site-header.is-stuck .brand-sub{display:none}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  .footer-grid{grid-template-columns:1fr;gap:var(--s4);padding-top:var(--s5)}
  .footer-base{padding-bottom:28px}
  .ki-grid--2,.ki-grid--3,.ki-grid--4{grid-template-columns:1fr}
  .ki-title{line-height:1.2}
  .brand-name{font-size:18px}
  .ki-num{font-size:2em}
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  [data-reveal]{opacity:1;transform:none;transition:none}
  .ki-card,.ki-btn,.ki-action,.ki-filter-btn,.nav-toggle-box span{transition:none}
  .ki-card:hover{transform:none}
}