/* =========================================================
   乐鱼赛场 · Site Kit 共享样式 (/assets/site.css)
   01 变量 / 02 Reset / 03 中文排版 / 04 通用组件
   05 头部 / 06 页脚 / 07 响应式 / 08 动效降级
   ========================================================= */

/* ---------- 01. 变量 ---------- */
:root{
  --abyss:#06131F;
  --navy:#0A1F30;
  --panel:#0F2C40;
  --line:#28536B;
  --line-soft:rgba(40,83,107,.5);
  --cyan:#2FE3C2;
  --cyan-soft:#9FF6E7;
  --coral:#FF7A59;
  --ice:#EAF7FF;
  --mist:#8FB3C4;
  --mist-dim:#6C93A8;
  --white:#FFFFFF;
  --ink:#04121B;

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

  --max:1240px;
  --gutter:clamp(18px,4vw,48px);
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 02. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:clamp(96px,15vh,168px);
}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0}
ul[class],ol[class]{list-style:none}
img,picture,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
a{color:inherit}
hr{border:0}
table{border-collapse:collapse;width:100%}

/* ---------- 03. 中文排版基线 ---------- */
body{
  min-height:100vh;
  background-color:var(--abyss);
  color:var(--ice);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  text-rendering:optimizeLegibility;
}
::selection{background:var(--cyan);color:var(--ink)}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.1;letter-spacing:-.01em;color:var(--ice)}
p{color:var(--ice)}
strong{font-weight:700;color:var(--white)}
small{font-size:.82em}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}

.h-display{
  font-family:var(--font-display);
  font-size:clamp(3rem,7vw,6.5rem);
  line-height:.95;
  font-weight:900;
  letter-spacing:-.02em;
  color:var(--white);
}
.h2{font-size:clamp(2rem,4vw,3.6rem);line-height:1.05;font-weight:800;letter-spacing:-.01em}
.lede{font-size:clamp(1rem,1.35vw,1.15rem);line-height:1.8;color:var(--mist);max-width:54ch}
.eyebrow{
  display:inline-flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.24em;text-transform:uppercase;color:var(--cyan);
}
.eyebrow::before{content:"";width:16px;height:1px;background:var(--cyan);flex:none}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}
.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;
}

/* ---------- 04. 通用组件 ---------- */
.wrap{width:100%;max-width:var(--max);margin-inline:auto;padding-inline:var(--gutter)}
.wrap--narrow{max-width:820px}

.section{padding-block:clamp(48px,7vw,104px)}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:14px 28px;padding-bottom:18px;margin-bottom:clamp(24px,4vw,48px);
  border-bottom:1px solid var(--line-soft);
}
.section-head > *{min-width:0}

.divider{border:0;border-top:1px solid var(--line-soft);margin-block:clamp(24px,4vw,48px)}

.frame-grid{position:relative;isolation:isolate}
.frame-grid::before{
  content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background-image:linear-gradient(90deg,rgba(40,83,107,.28) 1px,transparent 1px);
  background-size:calc(100% / 6) 100%;
  opacity:.55;
  -webkit-mask-image:linear-gradient(180deg,transparent,#000 10%,#000 90%,transparent);
  mask-image:linear-gradient(180deg,transparent,#000 10%,#000 90%,transparent);
}

.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.grid--2{grid-template-columns:repeat(auto-fit,minmax(268px,1fr))}
.grid--3{grid-template-columns:repeat(auto-fit,minmax(220px,1fr))}

.crumbs{font-family:var(--font-mono);font-size:11.5px;letter-spacing:.12em;color:var(--mist)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;list-style:none;margin:0;padding:0}
.crumbs li{display:inline-flex;align-items:center;gap:8px}
.crumbs li + li::before{content:"/";color:var(--line)}
.crumbs a{color:var(--mist);text-decoration:none;transition:color .16s}
.crumbs a:hover{color:var(--cyan)}
.crumbs [aria-current="page"]{color:var(--ice)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:13px 22px;border:1px solid var(--line);border-radius:999px;
  background:transparent;color:var(--ice);
  font-size:14px;font-weight:600;letter-spacing:.05em;text-decoration:none;
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease),background .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan-soft);transform:translateY(-1px)}
.btn:active{transform:translateY(0)}
.btn--primary{background:var(--cyan);border-color:var(--cyan);color:var(--ink);font-weight:700}
.btn--primary:hover{background:var(--cyan-soft);border-color:var(--cyan-soft);color:var(--ink)}
.btn--ghost{border-color:var(--line-soft);color:var(--mist)}
.btn--ghost:hover{border-color:var(--cyan-soft);color:var(--ice)}

.card{
  position:relative;
  background:var(--panel);
  border:1px solid var(--line);
  padding:clamp(18px,2.4vw,28px);
  box-shadow:0 1px 0 rgba(0,0,0,.28);
  transition:border-color .2s var(--ease),transform .2s var(--ease);
}
.card:hover{border-color:var(--cyan);transform:translateY(-2px)}
.card--flat{background:transparent;box-shadow:none}
.card--flat:hover{background:rgba(15,44,64,.5)}

.tag{
  display:inline-flex;align-items:center;gap:7px;
  padding:4px 10px;border:1px solid rgba(47,227,194,.35);border-radius:999px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--cyan);white-space:nowrap;
}
.tag--coral{color:var(--coral);border-color:rgba(255,122,89,.42)}
.tag--muted{color:var(--mist);border-color:var(--line)}

.stat{display:flex;flex-direction:column;gap:6px}
.stat-value{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(1.8rem,3.4vw,2.8rem);font-weight:600;line-height:1;color:var(--white);
}
.stat-label{font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;text-transform:uppercase;color:var(--mist)}

.note{border-left:2px solid var(--coral);padding:6px 0 6px 16px;color:var(--mist);font-size:14px;line-height:1.75}
.note--info{border-left-color:var(--cyan)}

.toc{position:sticky;top:clamp(112px,16vh,180px);font-size:14px}
.toc-title{
  font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--mist);margin:0 0 12px;
}
.toc ul,.toc ol{list-style:none;margin:0;padding:0;border-left:1px solid var(--line)}
.toc a{
  display:block;padding:8px 0 8px 16px;margin-left:-1px;
  border-left:1px solid transparent;
  color:var(--mist);text-decoration:none;line-height:1.5;
  transition:color .16s var(--ease),border-color .16s var(--ease),background .16s var(--ease);
}
.toc a:hover{color:var(--ice);border-left-color:var(--cyan-soft)}
.toc a[aria-current="true"]{color:var(--cyan);border-left-color:var(--cyan);background:rgba(47,227,194,.07)}

.media{
  position:relative;overflow:hidden;margin:0;
  aspect-ratio:16 / 9;
  background:var(--navy);
  border:1px solid var(--line);
}
.media img,.media picture,.media svg{width:100%;height:100%;object-fit:cover;display:block}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:linear-gradient(180deg,rgba(6,19,31,0) 58%,rgba(6,19,31,.62) 100%);
}
.media--wide{aspect-ratio:21 / 9}
.media--tall{aspect-ratio:4 / 5}
.media--square{aspect-ratio:1 / 1}
.media-cap{
  display:block;margin-top:10px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;color:var(--mist);
}

.entry-float{
  position:fixed;right:clamp(12px,2vw,24px);bottom:clamp(12px,2vw,24px);z-index:70;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 16px;border-radius:999px;
  background:var(--cyan);color:var(--ink);
  font-size:13px;font-weight:700;letter-spacing:.06em;text-decoration:none;
  box-shadow:0 10px 26px rgba(0,0,0,.4);
  transition:background .18s var(--ease),transform .18s var(--ease);
}
.entry-float:hover{background:var(--cyan-soft);transform:translateY(-1px)}

.js [data-reveal]{opacity:0;transform:translateY(16px);transition:opacity .6s var(--ease),transform .6s var(--ease)}
.js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 05. 头部 ---------- */
.skip-link{
  position:absolute;left:14px;top:-120px;z-index:200;
  padding:10px 16px;border-radius:var(--radius);
  background:var(--cyan);color:var(--ink);
  font-size:14px;font-weight:700;text-decoration:none;
  transition:top .16s var(--ease);
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;top:0;z-index:80;
  color:var(--ice);
  background:rgba(6,19,31,.95);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
@supports not ((-webkit-backdrop-filter:blur(10px)) or (backdrop-filter:blur(10px))){
  .site-header{background:var(--abyss)}
}

.header-rail{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  max-width:var(--max);margin-inline:auto;
  padding:10px var(--gutter) 0;
  font-family:var(--font-mono);font-size:10.5px;font-weight:500;
  letter-spacing:.2em;text-transform:uppercase;color:var(--mist);
}
.rail-id{display:inline-flex;align-items:center;gap:8px;white-space:nowrap;min-width:0}
.rail-dot{
  width:6px;height:6px;flex:none;background:var(--cyan);border-radius:50%;
  box-shadow:0 0 10px rgba(47,227,194,.85);
  animation:railPulse 2.6s ease-in-out infinite;
}
.rail-note{white-space:nowrap;letter-spacing:.16em;color:var(--mist)}
@keyframes railPulse{0%,100%{opacity:1}50%{opacity:.3}}

.header-main{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:clamp(12px,3vw,40px);
  max-width:var(--max);margin-inline:auto;
  padding:9px var(--gutter) 12px;
}

.brand{display:inline-flex;align-items:center;gap:11px;text-decoration:none;color:var(--ice);min-width:0}
.brand-mark{
  position:relative;display:grid;place-items:center;flex:none;
  width:36px;height:36px;
  background:var(--navy);border:1px solid var(--line);
  transition:border-color .18s var(--ease);
}
.brand-mark::after{
  content:"";position:absolute;right:3px;bottom:3px;
  width:4px;height:4px;background:var(--coral);
}
.brand-core{
  width:13px;height:13px;background:var(--cyan);
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand:hover .brand-mark{border-color:var(--cyan)}
.brand-text{display:flex;flex-direction:column;gap:5px;min-width:0}
.brand-name{font-size:17px;font-weight:800;line-height:1;letter-spacing:.08em;color:var(--ice);white-space:nowrap}
.brand-sub{
  font-family:var(--font-mono);font-size:9.5px;line-height:1;
  letter-spacing:.26em;color:var(--cyan);white-space:nowrap;
}

.site-nav{justify-self:center;min-width:0}
.nav-list{
  display:flex;align-items:center;gap:clamp(2px,1vw,12px);
  margin:0;padding:0;list-style:none;
  counter-reset:navidx;
}
.nav-list li{counter-increment:navidx;min-width:0}
.nav-list a{
  position:relative;display:inline-flex;align-items:baseline;gap:6px;
  padding:10px 10px 11px;
  color:var(--mist);font-size:14.5px;letter-spacing:.03em;text-decoration:none;
  white-space:nowrap;
  transition:color .18s var(--ease);
}
.nav-list a::before{
  content:counter(navidx,decimal-leading-zero);
  font-family:var(--font-mono);font-size:9.5px;letter-spacing:.1em;
  color:var(--line);transition:color .18s var(--ease);
}
.nav-list a::after{
  content:"";position:absolute;left:10px;right:10px;bottom:4px;height:1px;
  background:var(--cyan);transform:scaleX(0);transform-origin:left;
  transition:transform .22s var(--ease);
}
.nav-list a:hover{color:var(--ice)}
.nav-list a:hover::before{color:var(--cyan-soft)}
.nav-list a:hover::after{transform:scaleX(1)}
.nav-list a[aria-current="page"]{color:var(--ice)}
.nav-list a[aria-current="page"]::before{color:var(--cyan)}
.nav-list a[aria-current="page"]::after{transform:scaleX(1)}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  min-height:38px;padding:9px 12px;
  border:1px solid var(--line);border-radius:999px;
  background:transparent;color:var(--ice);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.16em;
  cursor:pointer;
  transition:border-color .18s var(--ease),color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan-soft)}
.nav-toggle-bar{position:relative;display:block;width:14px;height:1px;background:currentColor}
.nav-toggle-bar::before,
.nav-toggle-bar::after{
  content:"";position:absolute;left:0;width:14px;height:1px;background:currentColor;
  transition:transform .2s var(--ease);
}
.nav-toggle-bar::before{top:-4px}
.nav-toggle-bar::after{top:4px}
.site-header[data-open="true"] .nav-toggle-bar{background:transparent}
.site-header[data-open="true"] .nav-toggle-bar::before{transform:translateY(4px) rotate(45deg)}
.site-header[data-open="true"] .nav-toggle-bar::after{transform:translateY(-4px) rotate(-45deg)}

.entry-pill{
  display:inline-flex;align-items:center;gap:9px;
  padding:11px 18px;border-radius:999px;
  background:var(--cyan);border:1px solid var(--cyan);color:var(--ink);
  font-size:13.5px;font-weight:700;letter-spacing:.08em;text-decoration:none;white-space:nowrap;
  box-shadow:0 0 0 0 rgba(47,227,194,.35);
  transition:background .18s var(--ease),border-color .18s var(--ease),box-shadow .18s var(--ease),transform .18s var(--ease);
}
.entry-pill:hover{
  background:var(--cyan-soft);border-color:var(--cyan-soft);
  box-shadow:0 0 0 4px rgba(47,227,194,.16);
  transform:translateY(-1px);
}
.entry-pill:active{transform:translateY(0)}
.entry-arrow{font-family:var(--font-mono);font-size:13px;line-height:1}

.progress{position:relative;height:2px;background:rgba(40,83,107,.38);overflow:hidden}
.progress-bar{
  display:block;height:100%;width:100%;
  background:var(--cyan);
  transform:scaleX(0);transform-origin:0 50%;
  will-change:transform;
}

/* ---------- 06. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,9vw,132px);
  background:var(--navy);
  border-top:1px solid var(--line);
  color:var(--mist);
  font-size:14px;
}
.site-footer::before{
  content:"";position:absolute;top:-1px;left:0;
  width:clamp(64px,18vw,180px);height:1px;background:var(--cyan);
}

.footer-top{
  display:grid;
  grid-template-columns:minmax(240px,1.25fr) repeat(3,minmax(0,1fr));
  gap:clamp(24px,4vw,56px);
  max-width:var(--max);margin-inline:auto;
  padding:clamp(36px,5.5vw,72px) var(--gutter) clamp(24px,3.5vw,44px);
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:16px;min-width:0}
.brand--footer{gap:10px}
.brand--footer .brand-mark{width:32px;height:32px}
.brand--footer .brand-name{font-size:16px}
.footer-summary{max-width:32ch;margin:0;color:var(--mist);font-size:14px;line-height:1.8}
.footer-entry{
  display:inline-flex;align-items:center;gap:10px;
  padding:11px 18px;border:1px solid var(--line);border-radius:999px;
  color:var(--ice);text-decoration:none;
  font-size:13px;font-weight:700;letter-spacing:.08em;
  transition:border-color .18s var(--ease),color .18s var(--ease),background .18s var(--ease);
}
.footer-entry:hover{border-color:var(--cyan);color:var(--cyan);background:rgba(47,227,194,.06)}
.footer-entry-label{line-height:1}
.footer-entry-arrow{font-family:var(--font-mono);font-size:13px;line-height:1}

.footer-col{min-width:0}
.footer-title{
  display:flex;align-items:center;gap:8px;
  margin:0 0 14px;
  font-family:var(--font-mono);font-size:11px;font-weight:500;
  letter-spacing:.22em;text-transform:uppercase;color:var(--ice);
}
.footer-title::before{content:"";width:14px;height:1px;flex:none;background:var(--cyan)}
.footer-col ul{display:flex;flex-direction:column;gap:2px;margin:0;padding:0;list-style:none}
.footer-col a{
  display:inline-block;padding:5px 0;
  color:var(--mist);font-size:14px;text-decoration:none;
  transition:color .16s var(--ease),padding-left .16s var(--ease);
}
.footer-col a:hover{color:var(--cyan-soft);padding-left:6px}

.footer-contact{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(190px,1fr));
  gap:18px clamp(20px,3vw,40px);
  max-width:var(--max);margin-inline:auto;
  padding:clamp(20px,3vw,32px) var(--gutter);
  border-top:1px solid var(--line-soft);
}
.contact-item{display:flex;flex-direction:column;gap:5px;min-width:0}
.contact-label{
  font-family:var(--font-mono);font-size:10px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--mist-dim);
}
.contact-value{color:var(--ice);font-size:14px;line-height:1.7;overflow-wrap:anywhere}
.contact-value--mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
  max-width:var(--max);margin-inline:auto;
  padding:16px var(--gutter) clamp(20px,3vw,32px);
  border-top:1px solid var(--line-soft);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;color:var(--mist-dim);
}
.footer-copy,.footer-icp{margin:0}
.footer-legal{display:flex;flex-wrap:wrap;gap:6px 18px;margin:0;padding:0;list-style:none}
.footer-legal a{color:var(--mist-dim);text-decoration:none;transition:color .16s var(--ease)}
.footer-legal a:hover{color:var(--cyan)}

/* ---------- 07. 响应式 ---------- */
@media (max-width:1099px){
  .nav-list a{padding:10px 8px 11px;font-size:13.5px}
  .nav-list a::before{display:none}
}

@media (max-width:959px){
  .header-main{
    grid-template-columns:minmax(0,1fr) auto auto;
    grid-template-areas:
      "brand toggle pill"
      "nav    nav    nav";
    gap:10px;
  }
  .brand{grid-area:brand}
  .nav-toggle{grid-area:toggle;display:inline-flex}
  .entry-pill{grid-area:pill}
  .site-nav{
    grid-area:nav;
    display:none;
    width:100%;justify-self:stretch;
    margin-top:2px;padding-top:8px;
    border-top:1px solid var(--line);
  }
  .site-nav[data-open="true"]{display:block;animation:navIn .2s var(--ease) both}
  .nav-list{flex-direction:column;align-items:stretch;gap:0}
  .nav-list a{width:100%;padding:13px 8px;font-size:15px;border-bottom:1px solid rgba(40,83,107,.4)}
  .nav-list a::before{display:inline;color:var(--line)}
  .nav-list a::after{display:none}
  .nav-list a[aria-current="page"]{background:rgba(47,227,194,.07)}
  @keyframes navIn{from{opacity:0;transform:translateY(-6px)}to{opacity:1;transform:none}}

  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1 / -1}
}

@media (max-width:720px){
  .toc{position:static}
  .entry-float{display:none}
}

@media (max-width:600px){
  body{font-size:16px}
  .header-rail{padding-top:8px;font-size:10px;letter-spacing:.16em}
  .rail-note{display:none}
  .header-main{padding-bottom:10px}
  .brand-mark{width:30px;height:30px}
  .brand-core{width:11px;height:11px}
  .brand-name{font-size:15.5px;letter-spacing:.06em}
  .brand-sub{font-size:8.5px;letter-spacing:.2em}
  .entry-pill{padding:9px 14px;font-size:12.5px;letter-spacing:.04em;gap:7px}
  .nav-toggle{padding:8px 10px;font-size:10.5px;letter-spacing:.12em}
  .footer-top{grid-template-columns:1fr}
  .footer-base{flex-direction:column;align-items:flex-start}
  .grid--2,.grid--3{grid-template-columns:1fr}
}

/* ---------- 08. 动效降级 ---------- */
@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}
  .card:hover,.btn:hover,.entry-pill:hover,.entry-float:hover{transform:none}
  .rail-dot{animation:none;opacity:1}
}