/* ============================================================
   开云赛场 KAIYUN · 共享样式 /assets/site.css
   夜场直播间 → 侧边轨道 + Bento 连续画布
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dd{margin:0;padding:0;}
ul,ol{list-style:none;}
img,svg,video,canvas{display:block;max-width:100%;}
a{color:inherit;text-decoration:none;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
table{border-collapse:collapse;}
main{display:block;}

/* ---------- 2. 变量 ---------- */
:root{
  --ink-950:#040712;
  --ink-900:#060A1B;
  --ink-800:#0E1430;
  --ink-700:#1A2450;
  --neon:#21F3E0;
  --neon-soft:#9BFFF4;
  --red:#FF3D57;
  --amber:#FFB627;
  --green:#4BE08B;
  --text:#EAF2FF;
  --text-soft:#C9D6F2;
  --muted:#8FA0C8;
  --line:rgba(33,243,224,.18);
  --line-soft:rgba(143,160,200,.18);
  --rail-w:88px;
  --rail-open:240px;
  --topbar-h:64px;
  --r-xl:28px;
  --r-lg:22px;
  --r-md:16px;
  --r-pill:999px;
  --gap:24px;
  --shell:1280px;
  --glow-neon:0 0 0 1px rgba(33,243,224,.45),0 0 26px -6px rgba(33,243,224,.55);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC","Segoe UI",system-ui,-apple-system,sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 3. 基础排版 ---------- */
html{scroll-behavior:smooth;}
body{
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(1000px 560px at 82% -10%, rgba(33,243,224,.13), transparent 62%),
    radial-gradient(760px 520px at 4% 104%, rgba(255,61,87,.10), transparent 60%),
    repeating-linear-gradient(0deg, rgba(143,160,200,.05) 0 1px, transparent 1px 4px);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}
h1,h2,h3,h4,h5{line-height:1.18;letter-spacing:-.02em;font-weight:900;}
h1{font-size:clamp(38px,5.2vw,72px);}
h2{font-size:clamp(26px,3vw,44px);}
h3{font-size:clamp(20px,2vw,26px);}
h4{font-size:18px;font-weight:700;letter-spacing:-.01em;}
strong,b{font-weight:700;color:var(--text);}
.mono{font-family:var(--font-mono);letter-spacing:.02em;}

:focus-visible{outline:2px solid var(--neon);outline-offset:2px;border-radius:8px;}
#main-content{display:block;}
#main-content:focus{outline:none;}

.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;}

@media (min-width:1024px){ body{padding-left:var(--rail-w);} }
@media (max-width:1023px){ body{padding-top:var(--topbar-h);} }

/* ---------- 4. 跳转链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:200;
  transform:translateY(-180%);
  padding:10px 20px;border-radius:var(--r-pill);
  background:var(--neon);color:#04202A;font-weight:800;font-size:14px;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:translateY(0);}

/* ---------- 5. 侧边轨道头部 ---------- */
.site-header{
  position:fixed;top:0;left:0;bottom:0;z-index:80;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  padding:22px 0 24px;
  background:linear-gradient(180deg,#0E1430 0%,#070C1E 58%,#060A1B 100%);
  border-right:1px solid var(--line);
  overflow:hidden;
  transition:width .24s var(--ease),box-shadow .24s var(--ease);
}
.site-header:hover,
.site-header:focus-within{width:var(--rail-open);box-shadow:24px 0 60px -30px rgba(0,0,0,.95);}

/* 品牌 */
.rail-brand{
  flex:0 0 auto;display:flex;align-items:center;gap:14px;
  height:52px;padding:0 13px 0 22px;
  border-radius:var(--r-md);
}
.brand-mark{
  position:relative;flex:0 0 auto;
  width:44px;height:44px;border-radius:14px;
  display:grid;place-items:center;overflow:hidden;
  background:linear-gradient(145deg,#1A2450,#0B1130);
  border:1px solid var(--line);
}
.brand-mark::before{
  content:"";position:absolute;left:-6px;right:-6px;bottom:-12px;height:22px;
  background:linear-gradient(90deg,transparent,var(--neon),transparent);
  filter:blur(9px);opacity:.55;
}
.brand-pulse{
  width:12px;height:12px;border-radius:50%;
  background:var(--neon);
  box-shadow:0 0 0 4px rgba(33,243,224,.16),0 0 16px rgba(33,243,224,.9);
}
.brand-text{
  display:flex;flex-direction:column;line-height:1.15;white-space:nowrap;
  opacity:0;transform:translateX(-8px);
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.site-header:hover .brand-text,
.site-header:focus-within .brand-text{opacity:1;transform:none;}
.brand-name{font-size:18px;font-weight:900;letter-spacing:-.01em;}
.brand-latin{font-family:var(--font-mono);font-size:11px;letter-spacing:.34em;color:var(--neon);}

/* 移动端按钮（桌面隐藏） */
.nav-toggle{display:none;}

/* 导航主体 */
.rail-nav{
  flex:1 1 auto;min-height:0;
  display:flex;flex-direction:column;
  overflow-y:auto;overflow-x:hidden;
  padding-bottom:8px;
  scrollbar-width:none;
}
.rail-nav::-webkit-scrollbar{width:0;height:0;}

.rail-tagline{
  margin:18px 13px 14px;padding:0 18px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  color:var(--muted);white-space:nowrap;
  opacity:0;transition:opacity .18s var(--ease);
}
.site-header:hover .rail-tagline,
.site-header:focus-within .rail-tagline{opacity:1;}

.rail-list{display:flex;flex-direction:column;gap:4px;padding:0 13px;}
.rail-link{
  position:relative;display:flex;align-items:center;gap:12px;
  height:46px;padding:0 18px;border-radius:var(--r-md);
  color:var(--muted);
  transition:background-color .2s var(--ease),color .2s var(--ease);
}
.rail-index{
  flex:0 0 26px;width:26px;text-align:center;
  font-family:var(--font-mono);font-size:12px;opacity:.7;
}
.rail-label{
  font-size:15px;font-weight:600;white-space:nowrap;
  opacity:0;transform:translateX(-8px);
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.site-header:hover .rail-label,
.site-header:focus-within .rail-label{opacity:1;transform:none;}

.rail-link:hover{background:var(--ink-700);color:var(--text);}
.rail-link:hover .rail-index{opacity:1;color:var(--neon);}
.rail-link[aria-current="page"]{background:rgba(33,243,224,.12);color:var(--neon-soft);}
.rail-link[aria-current="page"] .rail-index{opacity:1;color:var(--neon);}
.rail-link[aria-current="page"]::after{
  content:"";position:absolute;right:2px;top:50%;
  width:3px;height:20px;margin-top:-10px;border-radius:3px;
  background:var(--neon);box-shadow:0 0 12px rgba(33,243,224,.85);
}

.rail-foot{
  margin-top:auto;padding:16px 13px 0;
  display:flex;flex-direction:column;gap:12px;
}
.rail-cta{
  display:flex;align-items:center;gap:12px;
  height:46px;padding:0 18px;border-radius:var(--r-pill);
  background:linear-gradient(120deg,var(--neon),#5FE9FF);
  color:#04202A;font-size:14px;font-weight:800;white-space:nowrap;
  transition:box-shadow .2s var(--ease),transform .2s var(--ease);
}
.rail-cta:hover{box-shadow:0 0 26px -4px rgba(33,243,224,.75);transform:translateY(-2px);}
.rail-cta-glyph{flex:0 0 26px;width:26px;text-align:center;font-size:11px;line-height:1;}
.rail-cta-text{
  opacity:0;transform:translateX(-8px);
  transition:opacity .18s var(--ease),transform .18s var(--ease);
}
.site-header:hover .rail-cta-text,
.site-header:focus-within .rail-cta-text{opacity:1;transform:none;}

.rail-hint{
  padding:0 18px;
  font-size:11.5px;line-height:1.6;color:var(--muted);
  max-height:0;opacity:0;overflow:hidden;
  transition:max-height .24s var(--ease),opacity .18s var(--ease);
}
.site-header:hover .rail-hint,
.site-header:focus-within .rail-hint{max-height:180px;opacity:1;}

/* 遮罩与进度光带（桌面） */
.rail-scrim{display:none;}
.rail-progress{
  position:absolute;top:0;right:0;width:2px;height:100%;
  background:rgba(143,160,200,.12);
}
.rail-progress-fill{
  display:block;width:100%;height:100%;
  background:linear-gradient(180deg,var(--neon),var(--neon-soft));
  transform:scaleY(0);transform-origin:top center;
  box-shadow:0 0 14px rgba(33,243,224,.8);
}

/* ---------- 6. 头部移动端：顶栏 + 抽屉 ---------- */
@media (max-width:1023px){
  .site-header{
    top:0;right:0;bottom:auto;left:0;
    width:100%;height:var(--topbar-h);
    flex-direction:row;align-items:center;justify-content:space-between;
    padding:0 16px;
    border-right:0;border-bottom:1px solid var(--line);
    background:linear-gradient(90deg,#0E1430,#080D22);
    overflow:visible;
  }
  .site-header:hover,
  .site-header:focus-within{width:100%;box-shadow:none;}

  .rail-brand{padding:0;height:auto;gap:10px;}
  .brand-mark{width:36px;height:36px;border-radius:11px;}
  .brand-text{opacity:1;transform:none;}
  .brand-name{font-size:16px;}
  .brand-latin{font-size:9px;letter-spacing:.28em;}

  .nav-toggle{
    display:inline-flex;align-items:center;justify-content:center;
    width:44px;height:44px;border-radius:14px;
    border:1px solid var(--line);
    background:var(--ink-800);color:var(--neon);
    transition:background-color .2s var(--ease),border-color .2s var(--ease);
  }
  .nav-toggle:hover{background:var(--ink-700);}
  .nav-toggle-box{display:flex;flex-direction:column;justify-content:center;gap:4px;width:20px;}
  .nav-toggle-bar{
    display:block;height:2px;border-radius:2px;background:currentColor;
    transition:transform .2s var(--ease),opacity .2s var(--ease);
  }
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(1){transform:translateY(6px) rotate(45deg);}
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(2){opacity:0;transform:scaleX(.4);}
  .nav-toggle[aria-expanded="true"] .nav-toggle-bar:nth-child(3){transform:translateY(-6px) rotate(-45deg);}

  .rail-progress{display:none;}

  .rail-nav{
    position:fixed;top:0;left:0;bottom:0;z-index:95;
    width:min(84vw,320px);
    padding:calc(var(--topbar-h) + 18px) 0 28px;
    background:linear-gradient(180deg,#0E1430 0%,#070C1E 100%);
    border-right:1px solid var(--line);
    box-shadow:30px 0 70px -30px rgba(0,0,0,.95);
    transform:translateX(-104%);
    transition:transform .26s var(--ease);
    overflow-y:auto;
  }
  .rail-nav[data-open="true"]{transform:translateX(0);}

  .rail-nav .rail-tagline{opacity:1;margin-top:0;}
  .rail-nav .rail-label{opacity:1;transform:none;}
  .rail-nav .rail-cta-text{opacity:1;transform:none;}
  .rail-nav .rail-hint{opacity:1;max-height:none;margin-top:4px;}
  .rail-list{gap:6px;}
  .rail-link{height:50px;}
  .rail-cta{height:50px;}

  .rail-scrim{
    display:block;position:fixed;inset:0;z-index:90;
    background:rgba(4,7,18,.74);
    opacity:0;visibility:hidden;
    transition:opacity .22s var(--ease),visibility .22s linear;
  }
  .rail-scrim[data-open="true"]{opacity:1;visibility:visible;}
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:96px;
  background:linear-gradient(180deg,#0A0F26 0%,#050814 100%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;right:0;height:3px;
  background:linear-gradient(90deg,
    var(--neon) 0 16%, transparent 16% 18%,
    var(--amber) 18% 42%, transparent 42% 44%,
    var(--red) 44% 62%, transparent 62% 100%);
  opacity:.9;
}
.footer-shell{width:min(100% - 40px,var(--shell));margin-inline:auto;}
.footer-top{
  display:grid;grid-template-columns:minmax(260px,1fr) 2.1fr;
  gap:56px;padding:60px 0 46px;
}
.footer-logo{
  display:flex;align-items:baseline;gap:10px;
  font-size:22px;font-weight:900;letter-spacing:-.01em;
}
.footer-latin{font-family:var(--font-mono);font-size:11px;letter-spacing:.34em;color:var(--neon);}
.footer-tagline{
  margin-top:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.14em;color:var(--muted);
}
.footer-contact{margin-top:24px;display:flex;flex-direction:column;gap:10px;font-size:14px;color:var(--muted);}
.footer-item{display:flex;align-items:baseline;gap:10px;}
.footer-key{
  flex:0 0 auto;padding:2px 9px;border-radius:var(--r-pill);
  border:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:11px;color:var(--neon-soft);
}
.footer-nav{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:32px;}
.footer-col{display:flex;flex-direction:column;}
.footer-col-title{
  font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--text);
  padding-bottom:12px;border-bottom:1px solid var(--line-soft);
}
.footer-links{margin-top:16px;display:flex;flex-direction:column;gap:10px;}
.footer-link{
  display:inline-block;font-size:14px;color:var(--muted);
  transition:color .18s var(--ease),transform .18s var(--ease);
}
.footer-link:hover{color:var(--neon);transform:translateX(3px);}
.footer-bar{border-top:1px solid var(--line-soft);background:rgba(4,7,18,.6);}
.footer-bar-inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 28px;padding:20px 0;
}
.footer-service{font-size:12.5px;color:var(--muted);}
.footer-legal{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px 18px;
  font-family:var(--font-mono);font-size:12px;color:var(--muted);
}
.footer-icp{color:var(--neon-soft);}
.footer-copy{color:var(--muted);}

/* ---------- 8. 通用布局与组件 ---------- */
.shell{width:min(100% - 40px,var(--shell));margin-inline:auto;}
.section{padding:72px 0;}
.section--tight{padding:44px 0;}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:18px;margin-bottom:34px;
}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--neon);
}
.eyebrow::before{content:"";width:26px;height:2px;border-radius:2px;background:linear-gradient(90deg,var(--neon),transparent);}
.section-title{font-size:clamp(26px,3.2vw,44px);font-weight:900;}
.section-sub{margin-top:10px;max-width:62ch;color:var(--muted);font-size:16px;}
.lede{font-size:clamp(17px,1.6vw,20px);line-height:1.8;color:var(--text-soft);max-width:66ch;}

.panel{
  position:relative;
  background:var(--ink-800);
  border:1px solid transparent;
  border-radius:var(--r-xl);
  padding:28px;
  transition:background-color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.panel:hover{background:var(--ink-700);border-color:var(--line);transform:translateY(-3px);}
.panel--focus{
  background:linear-gradient(150deg,#13204A 0%,#0B1230 62%);
  border-color:var(--line);
  box-shadow:var(--glow-neon);
}
.panel--flat{background:rgba(14,20,48,.55);border:1px solid var(--line-soft);}
.panel--flat:hover{background:rgba(26,36,80,.65);transform:none;border-color:var(--line);}
.panel-slant{clip-path:polygon(0 0,100% 0,100% calc(100% - 22px),calc(100% - 34px) 100%,0 100%);}

.chip-row{display:flex;flex-wrap:wrap;gap:10px;}
.chip{
  display:inline-flex;align-items:center;gap:8px;
  padding:8px 16px;border-radius:var(--r-pill);
  background:rgba(26,36,80,.7);
  border:1px solid var(--line-soft);
  color:var(--muted);font-size:14px;font-weight:600;
  transition:background-color .2s var(--ease),color .2s var(--ease),border-color .2s var(--ease);
}
.chip:hover{background:var(--ink-700);color:var(--text);border-color:var(--line);}
.chip[aria-pressed="true"],
.chip.is-active{background:rgba(33,243,224,.14);border-color:rgba(33,243,224,.5);color:var(--neon-soft);}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 11px;border-radius:var(--r-pill);
  border:1px solid currentColor;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;text-transform:uppercase;
}
.tag--neon{color:var(--neon);}
.tag--red{color:var(--red);}
.tag--amber{color:var(--amber);}
.tag--green{color:var(--green);}
.tag--muted{color:var(--muted);}
.tag-dot{width:6px;height:6px;border-radius:50%;background:currentColor;box-shadow:0 0 10px currentColor;}

.stat-grid{display:grid;grid-template-columns:repeat(auto-fit,minmax(150px,1fr));gap:18px;}
.stat{padding:18px 20px;border-radius:var(--r-lg);background:rgba(14,20,48,.72);border:1px solid var(--line-soft);}
.stat-num{
  font-family:var(--font-mono);font-weight:700;
  font-size:clamp(22px,2.6vw,34px);line-height:1.2;letter-spacing:-.02em;
  color:var(--neon);
}
.stat-label{margin-top:6px;font-size:13px;color:var(--muted);}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 26px;border-radius:var(--r-pill);
  border:1px solid transparent;font-size:15px;font-weight:700;
  transition:transform .2s var(--ease),background-color .2s var(--ease),box-shadow .2s var(--ease),border-color .2s var(--ease);
}
.btn--primary{
  background:linear-gradient(120deg,var(--neon),#5FE9FF);
  color:#04202A;
  box-shadow:0 12px 30px -18px rgba(33,243,224,.9);
}
.btn--primary:hover{transform:translateY(-2px);box-shadow:0 18px 38px -18px rgba(33,243,224,.95);}
.btn--ghost{border-color:var(--line);color:var(--neon-soft);background:rgba(33,243,224,.06);}
.btn--ghost:hover{background:rgba(33,243,224,.14);transform:translateY(-2px);}
.btn--small{padding:9px 18px;font-size:13.5px;}

.breadcrumb{padding-top:18px;}
.breadcrumb-list{
  display:flex;flex-wrap:wrap;align-items:center;gap:10px;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;color:var(--muted);
}
.breadcrumb-list li{display:flex;align-items:center;gap:10px;}
.breadcrumb-list li + li::before{content:"/";color:rgba(143,160,200,.5);}
.breadcrumb-link{color:var(--muted);transition:color .18s var(--ease);}
.breadcrumb-link:hover{color:var(--neon);}
.breadcrumb-current{color:var(--neon-soft);}

.prose{max-width:72ch;}
.prose p{margin-bottom:1.1em;color:var(--text-soft);}
.prose h2{margin:1.6em 0 .6em;font-size:clamp(22px,2.4vw,30px);}
.prose h3{margin:1.4em 0 .5em;}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.25em;color:var(--text-soft);}
.prose li{margin-bottom:.5em;list-style:disc;}
.prose ol li{list-style:decimal;}
.prose a{color:var(--neon);border-bottom:1px solid rgba(33,243,224,.35);}

.grid{display:grid;gap:var(--gap);}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr));}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr));}
.grid--matrix{grid-template-columns:repeat(auto-fit,minmax(260px,1fr));}

.media{
  position:relative;overflow:hidden;
  border-radius:var(--r-lg);
  background:linear-gradient(150deg,#13204A,#080D22);
  border:1px solid var(--line-soft);
}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:repeating-linear-gradient(0deg,rgba(143,160,200,.06) 0 1px,transparent 1px 3px);
}
.media img{width:100%;height:100%;object-fit:cover;}
.media--16x9{aspect-ratio:16/9;}
.media--4x3{aspect-ratio:4/3;}
.media--1x1{aspect-ratio:1/1;}
.media--wide{aspect-ratio:21/9;}
.media-caption{margin-top:10px;font-size:13px;color:var(--muted);}

.divider{height:1px;border:0;background:linear-gradient(90deg,var(--line),transparent);margin:40px 0;}

/* 进入视口显现 */
.js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .55s var(--ease),transform .55s var(--ease);
}
.js [data-reveal].is-visible{opacity:1;transform:none;}

/* ---------- 9. 响应式 ---------- */
@media (max-width:1100px){
  .footer-top{grid-template-columns:1fr;gap:40px;}
}
@media (max-width:900px){
  .grid--2,.grid--3{grid-template-columns:1fr;}
  .section{padding:52px 0;}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr));gap:26px;}
}
@media (max-width:600px){
  .shell,.footer-shell{width:min(100% - 32px,var(--shell));}
  .panel{padding:22px;border-radius:var(--r-lg);}
  .footer-top{padding:44px 0 34px;}
  .footer-bar-inner{padding:18px 0;}
  .footer-legal{font-size:11.5px;}
  .site-footer{margin-top:64px;}
}

/* ---------- 10. 动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
  }
  .panel:hover{transform:none;}
  .btn--primary:hover,
  .btn--ghost:hover,
  .rail-cta:hover,
  .footer-link:hover{transform:none;}
  .js [data-reveal]{opacity:1;transform:none;}
}