/* ==========================================================================
   乐鱼赛事 · /assets/site.css
   共享外壳：深海蓝底 + 荧光青数据脉络 + 珊瑚橙行动节点
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink-0:#04101F;
  --ink-1:#0A2A4A;
  --ink-2:#12466F;
  --line:#1E3A5C;
  --line-soft:rgba(30,58,92,.6);
  --cyan:#40F0D0;
  --cyan-soft:#8FF7E4;
  --coral:#FF6A4D;
  --coral-soft:#FFB39F;
  --text:#E8F4FF;
  --text-2:#9FB8D0;
  --text-3:#6C86A3;
  --paper:#F2F7FA;
  --paper-ink:#0A2A4A;
  --paper-ink-2:#3B5C7A;
  --footer-bg:#0B1220;
  --pill:999px;
  --r-0:2px;
  --shadow-card:0 18px 40px -26px rgba(0,0,0,.95);
  --shell:1240px;
  --gutter:clamp(16px,4vw,40px);
  --font-body:"Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-display:"Arial Narrow","Helvetica Neue",Helvetica,"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"Liberation Mono","Courier New",monospace;
}

/* ---------- 2. Reset 与基础排版 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;background:var(--ink-0)}
body{
  margin:0;
  background-color:var(--ink-0);
  color:var(--text);
  font-family:var(--font-body);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  opacity:.35;
  background-image:
    linear-gradient(to right,var(--line-soft) 1px,transparent 1px),
    linear-gradient(to bottom,var(--line-soft) 1px,transparent 1px);
  background-size:80px 80px;
}
h1,h2,h3,h4,h5{margin:0;font-family:var(--font-display);font-weight:800;line-height:1.12;letter-spacing:-.01em}
p{margin:0 0 1em}
ul,ol{margin:0;padding:0;list-style:none}
img{max-width:100%;display:block}
figure{margin:0}
a{color:var(--cyan);text-decoration:none;transition:color .2s ease}
a:hover{color:var(--cyan-soft)}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:2px}
main:focus{outline:none}
@media (min-width:900px){body{font-size:17px}}

/* ---------- 3. 布局容器与工具类 ---------- */
.shell{width:min(calc(100% - var(--gutter) * 2),var(--shell));margin-inline:auto}
.visually-hidden{position:absolute!important;width:1px;height:1px;margin:-1px;padding:0;overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0}

.skip-link{
  position:fixed;left:16px;top:-70px;z-index:200;
  padding:10px 18px;border-radius:var(--pill);
  background:var(--cyan);color:#04101F;font-weight:700;font-size:14px;
  transition:top .2s ease;
}
.skip-link:focus{top:14px;color:#04101F}

/* ---------- 4. 滚动进度条 ---------- */
.scroll-progress{
  position:fixed;left:0;right:0;top:0;height:3px;z-index:120;
  background:rgba(30,58,92,.55);pointer-events:none;
}
.scroll-progress span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--cyan),var(--coral));
  transition:width .1s linear;
}

/* ---------- 5. 页头：双浮岛胶囊导航 ---------- */
.site-header{
  position:sticky;top:0;z-index:80;
  padding-top:clamp(8px,2vw,16px);
  transition:padding .25s ease;
}
.site-header[data-scrolled="true"]{padding-top:6px}
.header-shell{
  position:relative;
  display:flex;align-items:center;gap:12px;
  padding-bottom:6px;
}
.brand-island{
  display:flex;flex-direction:column;justify-content:center;
  padding:8px 20px 9px;
  border:1px solid var(--line);border-radius:var(--pill);
  background:rgba(10,42,74,.82);
  color:var(--text);line-height:1.15;
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  transition:background .25s ease,border-color .25s ease;
}
.brand-island:hover{background:rgba(18,70,111,.9);color:var(--text);border-color:var(--ink-2)}
.brand-mark{font-family:var(--font-display);font-weight:800;font-size:19px;letter-spacing:.02em;white-space:nowrap}
.brand-tagline{
  font-family:var(--font-mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--cyan);white-space:nowrap;
}
.nav-island{
  margin-left:auto;
  display:flex;align-items:center;gap:4px;
  padding:6px;
  border:1px solid var(--line);border-radius:var(--pill);
  background:rgba(10,42,74,.72);
  -webkit-backdrop-filter:blur(14px);backdrop-filter:blur(14px);
  transition:background .25s ease,box-shadow .25s ease;
}
.site-header[data-scrolled="true"] .nav-island{
  background:rgba(4,16,31,.9);
  box-shadow:0 20px 44px -30px #000;
}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-item{display:block}
.nav-link{
  position:relative;display:inline-block;
  padding:9px 14px;border-radius:var(--pill);
  font-size:14px;font-weight:600;color:var(--text-2);white-space:nowrap;
  transition:color .2s ease,background .2s ease;
}
.nav-link:hover{color:var(--text);background:rgba(64,240,208,.08)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{
  content:"";position:absolute;left:14px;right:14px;bottom:4px;height:2px;
  background:var(--cyan);border-radius:2px;
}
.nav-cta{
  margin-left:6px;padding:10px 18px;border-radius:var(--pill);
  background:var(--coral);color:#180803;
  font-size:13.5px;font-weight:800;letter-spacing:.02em;white-space:nowrap;
  transition:background .2s ease,transform .2s ease,box-shadow .2s ease;
}
.nav-cta:hover{background:var(--coral-soft);color:#180803;transform:translateY(-1px);box-shadow:0 12px 26px -14px var(--coral)}

.nav-toggle{
  display:none;margin-left:auto;align-items:center;gap:10px;
  padding:10px 16px;border:1px solid var(--line);border-radius:var(--pill);
  background:rgba(10,42,74,.82);color:var(--text);
  font-size:13px;font-weight:700;letter-spacing:.06em;
}
.nav-toggle-bars{display:grid;gap:4px;width:18px}
.nav-toggle-bars span{display:block;height:2px;background:var(--cyan);transition:transform .25s ease,opacity .2s ease}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

@media (max-width:960px){
  .nav-toggle{display:inline-flex}
  .nav-island{
    position:absolute;left:0;right:0;top:calc(100% + 8px);
    margin-left:0;flex-direction:column;align-items:stretch;gap:6px;
    padding:14px;border-radius:14px;
    background:rgba(4,16,31,.97);
    max-height:74vh;overflow:auto;
    opacity:0;visibility:hidden;transform:translateY(-10px);
    transition:opacity .22s ease,transform .22s ease,visibility .22s ease;
  }
  .nav-island[data-open="true"]{opacity:1;visibility:visible;transform:translateY(0)}
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{display:block;padding:12px 14px;font-size:15px}
  .nav-link[aria-current="page"]::after{left:14px;right:auto;width:24px;bottom:8px}
  .nav-cta{margin:8px 0 0;text-align:center;padding:13px 18px}
}
@media (max-width:520px){
  .brand-mark{font-size:17px}
  .brand-tagline{font-size:9.5px;letter-spacing:.1em}
  .brand-island{padding:7px 15px 8px}
}

/* ---------- 6. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;gap:8px;
  padding:13px 22px;border:1px solid transparent;border-radius:var(--r-0);
  font-size:15px;font-weight:700;letter-spacing:.01em;
  transition:transform .2s ease,background .2s ease,border-color .2s ease,color .2s ease;
}
.btn--primary{background:var(--coral);color:#160702}
.btn--primary:hover{background:var(--coral-soft);color:#160702;transform:translateY(-2px)}
.btn--ghost{border-color:var(--line);background:rgba(10,42,74,.5);color:var(--text)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}
.btn--link{padding:0;border:0;background:none;color:var(--cyan)}
.btn--link:hover{color:var(--cyan-soft);text-decoration:underline;text-underline-offset:4px}

/* ---------- 7. 面包屑 ---------- */
.breadcrumbs{
  display:flex;flex-wrap:wrap;gap:6px 10px;
  padding:24px 0 0;
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--text-3);
}
.breadcrumbs li{display:flex;align-items:center;gap:10px}
.breadcrumbs li+li::before{content:"/";color:var(--line)}
.breadcrumbs a{color:var(--text-2)}
.breadcrumbs a:hover{color:var(--cyan)}
.breadcrumbs [aria-current="page"]{color:var(--cyan)}

/* ---------- 8. 区块、网格与章节体系 ---------- */
.section{padding:clamp(44px,7vw,88px) 0;position:relative}
.section--tight{padding:clamp(28px,4vw,46px) 0}
.section--deep{
  background:linear-gradient(140deg,var(--ink-1),var(--ink-0) 72%);
  border-top:1px solid var(--line);border-bottom:1px solid var(--line);
}
.section--paper{background:var(--paper);color:var(--paper-ink)}
.section--paper .lead,.section--paper .muted,.section--paper .card-text{color:var(--paper-ink-2)}
.section--paper a{color:#0A5F73}
.section--paper a:hover{color:#08485A}
.section-head{
  display:flex;flex-wrap:wrap;align-items:flex-end;justify-content:space-between;
  gap:16px;margin-bottom:clamp(20px,3vw,34px);
}
.section-title{font-size:clamp(26px,3.6vw,40px)}
.eyebrow{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.22em;
  text-transform:uppercase;color:var(--cyan);
}
.chapter-num{
  display:block;
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(30px,4vw,46px);font-weight:700;line-height:1;
  letter-spacing:-.02em;color:var(--cyan);
}
.chapter-num--coral{color:var(--coral)}
.rule{height:1px;border:0;background:var(--line);margin:clamp(24px,4vw,48px) 0}
.slant{clip-path:polygon(0 0,100% 0,100% calc(100% - 46px),0 100%);padding-bottom:clamp(48px,7vw,84px)}

.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}
.grid--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.grid--8-4{grid-template-columns:minmax(0,8fr) minmax(0,4fr)}
@media (max-width:900px){
  .grid--3,.grid--4,.grid--7-5,.grid--5-7,.grid--8-4{grid-template-columns:minmax(0,1fr)}
}
@media (max-width:600px){.grid--2{grid-template-columns:minmax(0,1fr)}}

/* ---------- 9. 正文、卡片、标签、数据 ---------- */
.prose{max-width:68ch}
.prose h2{font-size:clamp(23px,3vw,32px);margin:1.6em 0 .5em}
.prose h3{font-size:clamp(18px,2vw,22px);margin:1.4em 0 .4em}
.prose p{margin-bottom:1.1em}
.prose strong{color:var(--cyan-soft)}
.section--paper .prose strong{color:#0A5F73}
.lead{max-width:62ch;font-size:clamp(17px,1.6vw,19px);line-height:1.7;color:var(--text-2)}
.muted{color:var(--text-2)}
.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

.layer{position:relative}
.layer::after{
  content:"";position:absolute;inset:0;transform:translate(8px,8px);
  border:1px solid var(--cyan);opacity:.32;pointer-events:none;
}
.layer > .card{position:relative;z-index:1}

.card{
  position:relative;
  padding:clamp(18px,2.2vw,26px);
  border:1px solid var(--line);border-radius:var(--r-0);
  background:rgba(10,42,74,.55);
  box-shadow:var(--shadow-card);
  transition:transform .22s ease,border-color .22s ease,background .22s ease;
}
.card:hover{transform:translate(-2px,-2px);border-color:var(--cyan);background:rgba(18,70,111,.6)}
.card--accent{border-top:3px solid var(--coral)}
.card--cyan{border-top:3px solid var(--cyan)}
.card-title{font-size:clamp(17px,1.6vw,20px);margin-bottom:8px}
.card-text{font-size:15px;color:var(--text-2);margin:0}
.card-meta{
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.1em;
  text-transform:uppercase;color:var(--text-3);margin-bottom:10px;
}
.section--paper .card{background:#FFFFFF;border-color:#CBDCE8;color:var(--paper-ink);box-shadow:0 16px 34px -28px rgba(10,42,74,.7)}

.stat{display:flex;flex-direction:column;gap:6px}
.stat-num{
  font-family:var(--font-mono);font-variant-numeric:tabular-nums;
  font-size:clamp(28px,3.6vw,42px);font-weight:700;line-height:1;color:var(--cyan);
}
.stat-label{font-size:13px;letter-spacing:.04em;color:var(--text-2)}
.stat--coral .stat-num{color:var(--coral)}
.section--paper .stat-label{color:var(--paper-ink-2)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:4px 10px;border:1px solid var(--line);border-radius:var(--pill);
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.08em;
  text-transform:uppercase;color:var(--text-2);
}
.tag--cyan{border-color:var(--cyan);color:var(--cyan)}
.tag--coral{border-color:var(--coral);color:var(--coral)}
.tag--fill{background:var(--coral-soft);border-color:transparent;color:#33150E}

.table-scroll{overflow-x:auto;border:1px solid var(--line);background:rgba(4,16,31,.35)}
.data-table{width:100%;border-collapse:collapse;font-size:14.5px}
.data-table caption{
  padding:12px 14px;text-align:left;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.16em;
  text-transform:uppercase;color:var(--text-3);
}
.data-table th,.data-table td{padding:11px 14px;border-bottom:1px solid var(--line);text-align:left}
.data-table thead th{
  background:var(--ink-2);color:var(--text);
  font-family:var(--font-mono);font-size:12px;letter-spacing:.06em;text-transform:uppercase;
}
.data-table tbody tr:hover{background:rgba(64,240,208,.06)}
.data-table td.is-num,.data-table th.is-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;text-align:right}

.panel{
  padding:clamp(18px,2.4vw,28px);
  border:1px solid var(--line);background:rgba(10,42,74,.45);
}
.panel--paper{background:var(--paper);border-color:#CBDCE8;color:var(--paper-ink-2)}

.fold{border:1px solid var(--line);background:rgba(10,42,74,.4)}
.fold+.fold{border-top:0}
.fold summary{
  display:flex;align-items:center;justify-content:space-between;gap:12px;
  padding:14px 18px;font-size:16px;font-weight:700;cursor:pointer;list-style:none;
}
.fold summary::-webkit-details-marker{display:none}
.fold summary::after{content:"+";font-family:var(--font-mono);font-size:18px;color:var(--cyan)}
.fold[open] summary::after{content:"–"}
.fold-body{padding:0 18px 16px;font-size:15px;color:var(--text-2)}
.section--paper .fold{background:#FFFFFF;border-color:#CBDCE8}
.section--paper .fold-body{color:var(--paper-ink-2)}

.toc{position:sticky;top:120px;border-left:1px solid var(--line);padding-left:18px}
.toc-title{
  margin-bottom:12px;
  font-family:var(--font-mono);font-size:11px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--text-3);
}
.toc a{
  display:block;margin-left:-20px;padding:6px 0 6px 18px;
  border-left:2px solid transparent;
  font-size:14px;color:var(--text-2);
}
.toc a:hover{color:var(--text)}
.toc a[aria-current="true"]{color:var(--cyan);border-left-color:var(--cyan)}
@media (max-width:960px){
  .toc{position:static;top:auto;border-left:0;padding-left:0}
  .toc a{margin-left:0;padding:6px 12px;border-left:0;border-bottom:1px solid var(--line-soft)}
  .toc a[aria-current="true"]{border-left:0;border-bottom-color:var(--cyan)}
}

/* ---------- 10. 图片容器（供页面阶段放置占位/图片） ---------- */
.media{
  position:relative;overflow:hidden;aspect-ratio:16/9;
  border:1px solid var(--line);
  background:linear-gradient(150deg,var(--ink-1),var(--ink-0));
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media img{width:100%;height:100%;object-fit:cover}
.media-placeholder{
  position:absolute;inset:0;display:grid;place-items:center;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.2em;
  text-transform:uppercase;color:var(--text-3);
  background-image:
    linear-gradient(to right,rgba(30,58,92,.55) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(30,58,92,.55) 1px,transparent 1px);
  background-size:34px 34px;
}
figcaption{
  margin-top:8px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.06em;color:var(--text-3);
}

/* ---------- 11. 显现动效 ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .5s ease,transform .5s ease}
html.js [data-reveal].is-visible{opacity:1;transform:none}

/* ---------- 12. 页脚 ---------- */
.site-footer{
  position:relative;z-index:1;
  margin-top:clamp(48px,8vw,110px);
  background:var(--footer-bg);border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";position:absolute;left:0;right:0;top:0;height:3px;
  background:linear-gradient(90deg,var(--coral) 0 16%,var(--cyan) 16% 40%,transparent 40%);
}
.footer-top{
  display:grid;gap:clamp(24px,3vw,44px);
  grid-template-columns:minmax(0,1.5fr) repeat(3,minmax(0,1fr));
  padding:clamp(40px,5vw,64px) 0 clamp(24px,3vw,36px);
}
.footer-brand{display:flex;flex-direction:column;gap:10px;max-width:36ch}
.footer-mark{font-family:var(--font-display);font-weight:800;font-size:22px;letter-spacing:.02em;color:var(--text)}
.footer-tagline{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;text-transform:uppercase;color:var(--cyan)}
.footer-blurb{margin:0;font-size:14px;color:var(--text-2)}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-mono);font-size:11.5px;letter-spacing:.18em;
  text-transform:uppercase;color:var(--text-3);
}
.footer-links{display:grid;gap:9px}
.footer-links a{font-size:14.5px;color:var(--text-2)}
.footer-links a:hover{color:var(--cyan)}
.footer-meta{
  display:flex;flex-wrap:wrap;gap:8px 24px;
  padding:18px 0;border-top:1px solid var(--line);
  font-size:13px;color:var(--text-2);
}
.footer-meta span{display:inline-flex;align-items:center;gap:8px}
.footer-bottom{
  display:flex;flex-wrap:wrap;justify-content:space-between;gap:10px 20px;
  padding:16px 0 clamp(28px,4vw,44px);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.04em;color:var(--text-3);
}
@media (max-width:900px){
  .footer-top{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-brand{grid-column:1/-1}
}
@media (max-width:560px){
  .footer-top{grid-template-columns:minmax(0,1fr)}
}

/* ---------- 13. 返回顶部 ---------- */
.back-to-top{
  position:fixed;right:clamp(14px,2.4vw,28px);bottom:clamp(14px,2.4vw,28px);z-index:90;
  display:inline-flex;align-items:center;gap:8px;
  padding:11px 16px;border:1px solid var(--line);border-radius:var(--pill);
  background:rgba(4,16,31,.92);color:var(--text-2);
  font-family:var(--font-mono);font-size:12.5px;letter-spacing:.08em;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .25s ease,transform .25s ease,visibility .25s ease,border-color .2s ease,color .2s ease;
}
.back-to-top[data-visible="true"]{opacity:1;visibility:visible;transform:none}
.back-to-top:hover{border-color:var(--cyan);color:var(--cyan)}

/* ---------- 14. 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;
  }
  html.js [data-reveal]{opacity:1;transform:none}
}