/* ============================================================
   博鱼体育 · 共享站壳样式  /assets/site.css
   深海基底 · 熔岩橙 · 荧光青 ｜ 左侧轨道 + 38:62 分屏 + 编号章节
   ============================================================ */

/* ---------- 01 reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,dl,dd,figure,blockquote{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{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;border-spacing:0;width:100%}
th,td{text-align:start}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}

/* ---------- 02 设计变量 ---------- */
:root{
  --deep:#061726;
  --shell:#04121f;
  --panel:#0C2338;
  --line:#1B3A55;
  --mist:#93A9BC;
  --bone:#F1F5F9;
  --soft:#C9D8E5;
  --lava:#FF5A1F;
  --lava-deep:#C23A0B;
  --cyan:#34E7D0;
  --violet:#7C5CFF;
  --alert:#FF3B5C;
  --grass:#5BE38A;

  --rail-w:96px;
  --rail-w-open:220px;
  --gut:clamp(18px,4vw,56px);
  --maxw:1440px;

  --font-display:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-body:"PingFang SC","Hiragino Sans GB","Noto Sans SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:ui-monospace,SFMono-Regular,Menlo,Consolas,"DejaVu Sans Mono",monospace;
}

/* ---------- 03 文档基底 ---------- */
body{
  min-height:100vh;
  background:var(--deep);
  color:var(--bone);
  font-family:var(--font-body);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  overflow-x:hidden;
  padding-block-start:64px;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(27,58,85,.55) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(27,58,85,.55) 1px,transparent 1px);
  background-size:80px 80px;
  opacity:.3;
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;line-height:1.12;letter-spacing:-.02em;color:var(--bone)}
p{color:var(--soft)}
.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

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

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

/* ---------- 04 跳转链接 ---------- */
.skip-link{
  position:fixed;
  inset-block-start:8px;
  inset-inline-start:8px;
  z-index:200;
  padding:10px 16px;
  background:var(--lava);
  color:#0B1220;
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
  transform:translateY(-200%);
  transition:transform .18s ease-out;
}
.skip-link:focus{transform:none}

/* ---------- 05 头部：侧边轨道 ---------- */
.rail{
  position:fixed;
  inset-block-start:0;
  inset-inline:0;
  z-index:60;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:16px;
  block-size:64px;
  padding-inline:20px;
  background:rgba(4,18,31,.95);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-block-end:1px solid var(--line);
}
.rail__brand{display:flex;align-items:center;gap:12px;min-width:0}
.rail__mark{
  position:relative;
  display:grid;
  place-items:center;
  inline-size:40px;
  block-size:40px;
  flex:none;
  border:1px solid var(--line);
  background:linear-gradient(135deg,#12314a 0%,#061726 100%);
  overflow:hidden;
}
.rail__mark-char{
  font-family:var(--font-display);
  font-weight:800;
  font-size:19px;
  line-height:1;
  color:var(--lava);
  letter-spacing:-.02em;
  transform:skewX(-3deg);
}
.rail__mark-grid{
  position:absolute;
  inset-block-end:0;
  inset-inline:0;
  block-size:3px;
  background:repeating-linear-gradient(90deg,var(--cyan) 0 3px,transparent 3px 7px);
  opacity:.85;
}
.rail__brand-text{display:grid;gap:0;min-width:0;line-height:1.2}
.rail__brand-line{font-size:13px;font-weight:700;color:var(--bone);white-space:nowrap}
.rail__brand-sub{font-size:10px;letter-spacing:.18em;color:var(--mist);white-space:nowrap}

.rail__toggle{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:none;
  padding:10px 12px;
  border:1px solid var(--line);
  color:var(--bone);
  font-size:11px;
  letter-spacing:.18em;
  transition:border-color .18s,color .18s;
}
.rail__toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.rail__toggle-bars{display:grid;gap:5px;inline-size:18px}
.rail__toggle-bars span{display:block;block-size:1px;background:currentColor;transition:transform .2s ease-out,opacity .2s ease-out}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars span:nth-child(1){transform:translateY(6px) rotate(45deg)}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars span:nth-child(2){opacity:0}
.rail__toggle[aria-expanded="true"] .rail__toggle-bars span:nth-child(3){transform:translateY(-6px) rotate(-45deg)}

.rail__nav{
  position:fixed;
  inset-block-start:64px;
  inset-inline:0;
  z-index:59;
  display:flex;
  flex-direction:column;
  gap:6px;
  padding:18px 20px 28px;
  max-block-size:calc(100vh - 64px);
  overflow-y:auto;
  background:var(--shell);
  border-block-end:1px solid var(--line);
  opacity:0;
  visibility:hidden;
  transform:translateY(-8px);
  pointer-events:none;
  transition:opacity .2s ease-out,transform .2s ease-out,visibility .2s ease-out;
}
.rail__nav[data-open]{opacity:1;visibility:visible;transform:none;pointer-events:auto}
.rail__nav-label{font-size:10px;letter-spacing:.24em;color:var(--mist);padding-inline:4px}
.rail__list{display:grid;gap:2px}
.rail__item{display:block}
.rail__link{
  position:relative;
  display:flex;
  align-items:center;
  gap:14px;
  min-height:48px;
  padding-inline:12px;
  border-block-end:1px solid rgba(27,58,85,.6);
  color:var(--mist);
  font-size:15px;
  white-space:nowrap;
  transition:color .18s,background-color .18s;
}
.rail__link::before{
  content:"";
  position:absolute;
  inset-block:6px;
  inset-inline-start:0;
  inline-size:3px;
  background:transparent;
  transition:background-color .18s;
}
.rail__link:hover{color:var(--bone);background:rgba(52,231,208,.06)}
.rail__link:hover::before{background:var(--line)}
.rail__link[aria-current="page"]{color:var(--bone)}
.rail__link[aria-current="page"]::before{background:var(--lava)}
.rail__link:focus-visible{outline-offset:-2px}
.rail__link-idx{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:11px;letter-spacing:.12em;color:var(--cyan);flex:none}
.rail__link-text{min-width:0}
.rail__cta{display:grid;gap:8px;margin-block-start:16px}

.rail__progress{
  position:absolute;
  inset-block-end:-1px;
  inset-inline:0;
  block-size:2px;
  background:linear-gradient(90deg,var(--lava),var(--cyan));
  transform-origin:0 50%;
  transform:scaleX(var(--p,0));
  pointer-events:none;
}

/* ---------- 06 页脚 ---------- */
.site-foot{
  position:relative;
  margin-block-start:clamp(64px,8vw,120px);
  background:var(--shell);
  border-block-start:1px solid var(--line);
}
.site-foot::before{
  content:"";
  position:absolute;
  inset-block-start:0;
  inset-inline:0;
  block-size:1px;
  background:repeating-linear-gradient(90deg,var(--cyan) 0 2px,transparent 2px 26px);
  opacity:.55;
}
.site-foot__grid{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:clamp(40px,6vw,88px) var(--gut);
  display:grid;
  gap:44px;
}
.site-foot__brand{display:grid;gap:14px;align-content:start}
.site-foot__mark{
  justify-self:start;
  font-family:var(--font-display);
  font-weight:800;
  font-size:clamp(26px,3.4vw,38px);
  letter-spacing:-.02em;
  color:var(--bone);
  transform:skewX(-3deg);
  transform-origin:left bottom;
  border-block-end:2px solid var(--lava);
  padding-block-end:4px;
}
.site-foot__line{font-size:11px;letter-spacing:.18em;color:var(--mist)}
.site-foot__summary{font-size:14px;line-height:1.7;color:var(--soft);max-width:42ch}
.site-foot__meta{display:grid;gap:8px;border-block-start:1px solid var(--line);padding-block-start:16px}
.site-foot__meta-row{display:grid;gap:2px}
.site-foot__meta-row dt{font-size:10px;letter-spacing:.2em;color:var(--mist)}
.site-foot__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:13px;color:var(--bone);word-break:break-all}
.site-foot__reply{font-size:12px;line-height:1.7;color:var(--mist);max-width:40ch}
.site-foot__cols{display:grid;gap:32px;align-content:start}
.site-foot__col{display:grid;gap:12px;align-content:start}
.site-foot__col-title{
  display:flex;
  align-items:baseline;
  gap:10px;
  font-size:12px;
  letter-spacing:.2em;
  color:var(--bone);
  border-block-end:1px solid var(--line);
  padding-block-end:10px;
}
.site-foot__col-idx{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:11px;color:var(--lava)}
.site-foot__links{display:grid;gap:8px}
.site-foot__link{
  display:inline-block;
  font-size:14px;
  color:var(--mist);
  border-block-end:1px solid transparent;
  padding-block-end:2px;
  transition:color .18s,border-color .18s;
}
.site-foot__link:hover{color:var(--cyan);border-block-end-color:var(--cyan)}
.site-foot__bar{
  border-block-start:1px solid var(--line);
  padding:18px var(--gut) 26px;
  display:flex;
  flex-wrap:wrap;
  gap:8px 28px;
  align-items:baseline;
}
.site-foot__legal{font-family:var(--font-mono);font-size:12px;color:var(--mist)}
.site-foot__note{font-size:12px;color:var(--mist)}
.site-foot__year{margin-inline-start:auto;font-family:var(--font-mono);font-size:12px;color:var(--mist)}

/* ---------- 07 布局骨架 ---------- */
.wrap{width:100%;max-width:var(--maxw);margin-inline:auto;padding-inline:var(--gut)}
.wrap--wide{max-width:1720px}
.split{display:grid;gap:clamp(28px,4vw,60px)}
.section{padding-block:clamp(56px,8vw,112px)}
.section--tight{padding-block:clamp(28px,4vw,56px)}
.section--panel{background:var(--panel);border-block:1px solid var(--line)}
.divider{block-size:1px;background:var(--line);border:0;margin-block:clamp(24px,3vw,48px)}
.ticks{block-size:10px;background:repeating-linear-gradient(90deg,var(--line) 0 1px,transparent 1px 14px)}
.panel{background:var(--panel);border:1px solid var(--line);padding:clamp(18px,2.4vw,32px)}
.grid-12{display:grid;gap:24px}
.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 12}

/* ---------- 08 排版组件 ---------- */
.eyebrow{
  display:inline-flex;
  align-items:center;
  gap:10px;
  font-size:11px;
  letter-spacing:.22em;
  color:var(--mist);
  text-transform:uppercase;
}
.eyebrow::before{content:"";inline-size:26px;block-size:1px;background:var(--lava)}
.display{
  font-family:var(--font-display);
  font-weight:800;
  letter-spacing:-.02em;
  line-height:.94;
  color:var(--bone);
  transform:skewX(-3deg);
  transform-origin:left bottom;
}
.display--xl{font-size:clamp(56px,9vw,132px)}
.display--l{font-size:clamp(38px,6vw,72px)}
.display--m{font-size:clamp(26px,3.6vw,40px)}
.lede{font-size:clamp(16px,1.4vw,20px);line-height:1.7;color:var(--soft);max-width:62ch}
.chapter{display:grid;gap:12px;margin-block-end:clamp(28px,4vw,56px)}
.chapter-num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:12px;letter-spacing:.18em;color:var(--lava)}
.chapter-title{font-size:clamp(28px,4vw,40px);transform:skewX(-3deg);transform-origin:left bottom}
.chapter-desc{font-size:15px;color:var(--mist);max-width:56ch}
.prose{max-width:68ch}
.prose p{margin-block-end:1.2em;color:var(--soft)}
.prose h2{font-size:22px;margin-block:1.6em .6em}
.prose ul{display:grid;gap:8px;margin-block-end:1.2em}
.prose li{position:relative;padding-inline-start:18px;color:var(--soft)}
.prose li::before{content:"";position:absolute;inset-inline-start:0;inset-block-start:.78em;inline-size:8px;block-size:1px;background:var(--lava)}

/* ---------- 09 按钮与链接 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:12px 18px;
  border:1px solid var(--line);
  background:transparent;
  color:var(--bone);
  font-size:13px;
  letter-spacing:.1em;
  white-space:nowrap;
  transition:background-color .18s,color .18s,border-color .18s,transform .18s ease-out;
}
.btn__mark{font-family:var(--font-mono);font-size:13px;line-height:1;color:var(--lava);flex:none}
.btn__text{min-width:0}
.btn--primary{background:var(--lava);border-color:var(--lava);color:#0B1220;font-weight:700}
.btn--primary .btn__mark{color:#0B1220}
.btn--primary:hover{background:var(--lava-deep);border-color:var(--lava-deep);transform:translateY(-2px)}
.btn--ghost{border-color:var(--line);color:var(--bone)}
.btn--ghost:hover{border-color:var(--cyan);color:var(--cyan);transform:translateY(-2px)}
.btn--rail{inline-size:100%;justify-content:flex-start;gap:10px;padding:12px 14px;font-size:13px;overflow:hidden}
.link-arrow{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-size:14px;
  color:var(--cyan);
  border-block-end:1px solid transparent;
  padding-block-end:2px;
  transition:border-color .18s;
}
.link-arrow::after{content:"→";font-family:var(--font-mono);transition:transform .18s ease-out}
.link-arrow:hover{border-block-end-color:var(--cyan)}
.link-arrow:hover::after{transform:translateX(3px)}

/* ---------- 10 数据组件 ---------- */
.card{display:grid;gap:12px;background:var(--panel);border:1px solid var(--line);padding:clamp(16px,2vw,24px)}
.card__head{display:flex;align-items:baseline;justify-content:space-between;gap:12px;border-block-end:1px solid var(--line);padding-block-end:10px}
.card__title{font-size:16px;font-weight:700;letter-spacing:.01em}
.card__idx{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:12px;color:var(--cyan)}
.stat{display:grid;gap:4px}
.stat__value{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-weight:500;font-size:clamp(24px,3vw,34px);line-height:1;color:var(--bone)}
.stat__label{font-size:12px;letter-spacing:.14em;color:var(--mist)}
.stat__delta{font-family:var(--font-mono);font-variant-numeric:tabular-nums;font-size:13px;color:var(--grass)}
.stat__delta--down{color:var(--alert)}
.data-table{font-size:14px}
.data-table caption{font-size:11px;letter-spacing:.18em;color:var(--mist);text-align:start;padding-block-end:10px}
.data-table th{
  font-size:11px;
  font-weight:500;
  letter-spacing:.16em;
  color:var(--mist);
  padding:10px 12px;
  border-block-end:1px solid var(--line);
  white-space:nowrap;
}
.data-table td{padding:12px;border-block-end:1px solid rgba(27,58,85,.6);color:var(--soft)}
.data-table tbody tr:hover{background:rgba(52,231,208,.05)}
.data-table tbody tr[tabindex]:focus-visible{outline:2px solid var(--lava);outline-offset:-2px}
.data-table .num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;text-align:end;color:var(--bone)}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 8px;
  border:1px solid var(--line);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--mist);
  white-space:nowrap;
}
.tag--lava{color:#FFC4AB;border-color:rgba(255,90,31,.5);background:rgba(255,90,31,.12)}
.tag--cyan{color:#A9F6EC;border-color:rgba(52,231,208,.45);background:rgba(52,231,208,.1)}
.tag--violet{color:#C7BCFF;border-color:rgba(124,92,255,.5);background:rgba(124,92,255,.12)}
.tag--alert{color:#FFB3C0;border-color:rgba(255,59,92,.5);background:rgba(255,59,92,.12)}
.tag--grass{color:#BDF3CD;border-color:rgba(91,227,138,.45);background:rgba(91,227,138,.1)}
.status-dot{display:inline-block;flex:none;inline-size:8px;block-size:8px;background:var(--alert)}
.status-dot--ok{background:var(--grass)}
.status-dot--watch{background:var(--cyan)}

/* ---------- 11 面包屑 ---------- */
.breadcrumbs{display:flex;flex-wrap:wrap;gap:8px;font-size:11px;letter-spacing:.16em;color:var(--mist);text-transform:uppercase}
.breadcrumbs li{display:inline-flex;align-items:center;gap:8px}
.breadcrumbs li::after{content:"/";color:var(--line)}
.breadcrumbs li:last-child::after{content:none}
.breadcrumbs a:hover{color:var(--cyan)}

/* ---------- 12 图片容器 ---------- */
.media{position:relative;background:var(--panel);border:1px solid var(--line);overflow:hidden}
.media__frame{position:relative;aspect-ratio:16/9;overflow:hidden;background:linear-gradient(160deg,#12314a 0%,#061726 72%)}
.media__frame--wide{aspect-ratio:21/9}
.media__frame--square{aspect-ratio:1/1}
.media__frame--tall{aspect-ratio:3/4}
.media img{inline-size:100%;block-size:100%;object-fit:cover}
.media__frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(90deg,rgba(52,231,208,.16) 1px,transparent 1px),
    linear-gradient(0deg,rgba(52,231,208,.16) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.45;
}
.media__tag{position:absolute;inset-block-start:12px;inset-inline-start:12px;z-index:2}
.media__caption{padding:10px 14px;border-block-start:1px solid var(--line);font-size:13px;color:var(--mist)}
.media--cut{clip-path:polygon(0 0,100% 0,100% calc(100% - 30px),calc(100% - 30px) 100%,0 100%)}

/* ---------- 13 入视口点亮 ---------- */
.has-js [data-reveal]{opacity:0;transform:translateY(10px);transition:opacity .32s ease-out,transform .32s ease-out}
.has-js [data-reveal].is-lit{opacity:1;transform:none}

/* ---------- 14 桌面：轨道 + 分屏 ---------- */
@media (min-width:768px){
  .site-foot__cols{grid-template-columns:repeat(3,minmax(0,1fr));gap:28px}
  .grid-12{grid-template-columns:repeat(12,minmax(0,1fr));gap:clamp(16px,2vw,28px)}
  .col-4{grid-column:span 4}
  .col-5{grid-column:span 5}
  .col-6{grid-column:span 6}
  .col-7{grid-column:span 7}
  .col-8{grid-column:span 8}
}

@media (min-width:1024px){
  body{padding-block-start:0;padding-inline-start:var(--rail-w)}

  .rail{
    inset-block:0;
    inset-inline-start:0;
    inset-inline-end:auto;
    inline-size:var(--rail-w);
    block-size:auto;
    flex-direction:column;
    align-items:stretch;
    justify-content:flex-start;
    gap:0;
    padding:26px 0 22px;
    padding-inline:0;
    background:var(--shell);
    border-block-end:0;
    border-inline-end:1px solid var(--line);
    overflow:hidden;
    transition:inline-size .28s ease-out;
  }
  .rail:hover,.rail:focus-within{inline-size:var(--rail-w-open);box-shadow:22px 0 48px rgba(2,10,18,.55)}
  .rail__brand{padding-inline:28px}
  .rail__brand-text{opacity:0;max-inline-size:0;overflow:hidden;transition:opacity .2s ease-out,max-inline-size .28s ease-out}
  .rail:hover .rail__brand-text,.rail:focus-within .rail__brand-text{opacity:1;max-inline-size:170px}
  .rail__toggle{display:none}

  .rail__nav{
    position:static;
    inset:auto;
    opacity:1;
    visibility:visible;
    transform:none;
    pointer-events:auto;
    background:none;
    border:0;
    padding:0;
    max-block-size:none;
    overflow:visible;
    margin-block-start:34px;
    flex:1 1 auto;
    gap:0;
  }
  .rail__nav-label{padding-inline:28px;margin-block-end:10px}
  .rail__list{gap:0}
  .rail__link{
    min-height:46px;
    padding-inline:14px 12px;
    padding-inline-start:28px;
    border-block-end:0;
    font-size:14px;
  }
  .rail__link:focus-visible{outline-offset:-2px}
  .rail__link::before{inset-block:8px}
  .rail__link-text{opacity:0;transition:opacity .2s ease-out}
  .rail:hover .rail__link-text,.rail:focus-within .rail__link-text{opacity:1}
  .rail__cta{margin-block-start:auto;padding-inline:28px;gap:10px}
  .btn--rail .btn__text{opacity:0;transition:opacity .2s ease-out}
  .rail:hover .btn--rail .btn__text,.rail:focus-within .btn--rail .btn__text{opacity:1}

  .rail__progress{
    inset-block:0;
    inset-block-end:0;
    inset-inline:auto 0;
    inline-size:2px;
    block-size:100%;
    transform-origin:50% 0;
    transform:scaleY(var(--p,0));
  }

  .skip-link{inset-inline-start:calc(var(--rail-w) + 8px)}

  .site-foot__grid{grid-template-columns:38fr 62fr;gap:clamp(40px,5vw,80px)}
  .split{grid-template-columns:38fr 62fr;align-items:start}
  .split--reverse{grid-template-columns:62fr 38fr}
  .split__aside{position:sticky;inset-block-start:96px}
}

@media (min-width:1280px){
  .site-foot__summary{font-size:15px}
}

/* ---------- 15 无障碍与降级 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    transition-duration:.001ms!important;
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .btn:hover{transform:none}
  .link-arrow:hover::after{transform:none}
}