/* ============================================================
   乐鱼手机赛场 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件
   ============================================================ */

*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote{margin:0;}
ul,ol{padding:0;list-style:none;}
img,svg{display:block;max-width:100%;}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer;}
a{color:inherit;text-decoration:none;}
a:hover{text-decoration:underline;text-underline-offset:4px;}
table{border-collapse:collapse;width:100%;}
:focus-visible{outline:2px solid var(--accent);outline-offset:3px;border-radius:6px;}

:root{
  --ink:#0B1B33;
  --ink-deep:#071527;
  --paper:#F6F1E7;
  --paper-raise:#FFFCF5;
  --text:#101820;
  --brand:#17A2D6;
  --brand-soft:#7FD3EE;
  --accent:#FF6A2B;
  --pulse:#B4FF57;
  --muted:#5A6B82;
  --rule:#D9CFBC;
  --alert:#B03A29;
  --r-lg:28px;
  --r-md:18px;
  --r-sm:10px;
  --pill:999px;
  --header-h:74px;
  --header-h-scrolled:58px;
  --shell:1200px;
  --gutter:clamp(16px,4vw,40px);
  --gap:clamp(16px,2.6vw,32px);
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Roboto Mono","Courier New",monospace;
  --ease-out:cubic-bezier(.22,.61,.36,1);
}

body{
  background:var(--paper);
  color:var(--text);
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  -webkit-font-smoothing:antialiased;
}
body.nav-open{overflow:hidden;}

/* ---------- 排版基元 ---------- */
.display{
  font-size:clamp(44px,9vw,120px);
  font-weight:900;
  line-height:.98;
  letter-spacing:-.02em;
}
.section-title{
  font-size:clamp(26px,4.2vw,40px);
  font-weight:800;
  line-height:1.2;
  letter-spacing:-.01em;
}
.eyebrow{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.28em;
  text-transform:uppercase;
  color:var(--muted);
}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.7;max-width:34em;}
.prose{font-size:17px;line-height:1.75;max-width:34em;}
.prose h2{font-size:clamp(24px,3.2vw,34px);font-weight:800;line-height:1.25;margin:2.2em 0 .6em;}
.prose h3{font-size:20px;font-weight:700;margin:1.8em 0 .5em;}
.prose p + p{margin-top:1em;}
.prose ul{list-style:none;margin:1em 0;}
.prose li{position:relative;padding-left:1.2em;margin:.45em 0;}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:3px;background:var(--brand);border-radius:2px;}
.prose a{color:var(--text);text-decoration:underline;text-decoration-color:var(--brand);text-decoration-thickness:2px;text-underline-offset:4px;}
.prose a:hover{text-decoration-color:var(--accent);}
.num-mono{font-family:var(--font-mono);font-weight:700;font-variant-numeric:tabular-nums;letter-spacing:.12em;}
.vertical-note{
  writing-mode:vertical-rl;
  font-size:12px;
  letter-spacing:.24em;
  color:var(--muted);
}
.muted{color:var(--muted);}
.link-line{text-decoration:underline;text-decoration-color:var(--brand);text-decoration-thickness:2px;text-underline-offset:4px;}

/* ---------- 版式骨架 ---------- */
.shell{width:min(var(--shell),100% - (var(--gutter) * 2));margin-inline:auto;}
.grid-12{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap);}
.band--ink{background:var(--ink);color:var(--paper);}
.band--ink .eyebrow,.band--ink .muted{color:var(--brand-soft);}
.band--paper{background:var(--paper);color:var(--text);}
.u-offset-top{padding-top:var(--header-h);}
.divider{height:2px;background:var(--rule);border:0;border-radius:2px;}
.band--ink .divider{background:rgba(246,241,231,.18);}

/* ---------- 跳过链接 ---------- */
.skip-link{
  position:fixed;
  left:var(--gutter);
  top:-80px;
  z-index:120;
  display:inline-flex;
  align-items:center;
  min-height:44px;
  padding:10px 20px;
  border-radius:var(--pill);
  background:var(--paper);
  color:var(--text);
  font-weight:700;
  font-size:14px;
  transition:top .16s var(--ease-out);
}
.skip-link:focus{top:12px;}

/* ---------- 头部 ---------- */
.site-header{
  position:fixed;
  top:0;
  left:0;
  right:0;
  z-index:60;
  color:var(--paper);
  background:transparent;
  transition:background-color .32s var(--ease-out),box-shadow .32s var(--ease-out);
}
.site-header::before{
  content:"";
  position:absolute;
  inset:0;
  background:linear-gradient(180deg,rgba(7,21,39,.66),rgba(7,21,39,0));
  opacity:1;
  transition:opacity .32s var(--ease-out);
  pointer-events:none;
}
.site-header[data-scrolled],
.site-header[data-solid]{
  background:var(--ink);
  box-shadow:0 1px 0 rgba(127,211,238,.22);
}
.site-header[data-scrolled]::before,
.site-header[data-solid]::before{opacity:0;}

.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  width:100%;
  height:3px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:var(--brand);
  z-index:2;
  pointer-events:none;
}

.header-inner{
  position:relative;
  z-index:1;
  display:flex;
  align-items:center;
  gap:clamp(14px,2.4vw,36px);
  width:min(var(--shell),100% - (var(--gutter) * 2));
  margin-inline:auto;
  min-height:var(--header-h);
  transition:min-height .32s var(--ease-out);
}
.site-header[data-scrolled] .header-inner,
.site-header[data-solid] .header-inner{min-height:var(--header-h-scrolled);}

/* 品牌 */
.brand{display:inline-flex;align-items:center;gap:12px;margin-right:auto;flex:0 0 auto;}
.brand:hover{text-decoration:none;}
.brand-mark{display:inline-flex;align-items:flex-end;gap:3px;height:26px;transform:skewX(-12deg);}
.brand-mark__bar{display:block;width:4px;border-radius:2px;background:var(--brand);}
.brand-mark__bar:nth-child(1){height:12px;}
.brand-mark__bar:nth-child(2){height:19px;background:var(--brand-soft);}
.brand-mark__bar:nth-child(3){height:26px;background:var(--accent);}
.brand-text{display:flex;flex-direction:column;line-height:1.15;}
.brand-name{font-size:18px;font-weight:800;letter-spacing:-.01em;}
.brand-tag{font-size:11px;letter-spacing:.1em;color:rgba(246,241,231,.66);}

/* 主导航 */
.site-nav{margin-left:auto;}
.nav-list{display:flex;align-items:center;gap:clamp(10px,1.6vw,26px);}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  gap:7px;
  min-height:44px;
  font-size:15px;
  font-weight:600;
  letter-spacing:.01em;
  white-space:nowrap;
}
.nav-idx{font-family:var(--font-mono);font-size:11px;letter-spacing:.08em;color:rgba(246,241,231,.5);}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:9px;
  height:2px;
  background:var(--brand);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .16s var(--ease-out);
}
.nav-link:hover::after,
.nav-link:focus-visible::after{transform:scaleX(1);}
.nav-link[aria-current="page"]{color:var(--brand-soft);}
.nav-link[aria-current="page"]::before{
  content:"";
  width:7px;
  height:7px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--pulse);
  box-shadow:0 0 0 4px rgba(180,255,87,.18);
}
.nav-link[aria-current="page"] .nav-idx{color:var(--pulse);}
.nav-action{display:none;}

/* 头部 CTA */
.header-cta{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  min-height:44px;
  padding:0 20px;
  border-radius:var(--pill);
  background:var(--accent);
  color:#FFFFFF;
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  white-space:nowrap;
  transition:box-shadow .16s var(--ease-out),transform .16s var(--ease-out);
}
.header-cta:hover{text-decoration:none;transform:translateY(-1px);box-shadow:0 8px 20px rgba(255,106,43,.34);}

/* 抽屉按钮 */
.nav-toggle{
  position:relative;
  z-index:80;
  display:none;
  align-items:center;
  gap:10px;
  min-height:44px;
  min-width:44px;
  padding:0 16px;
  border:1px solid rgba(127,211,238,.4);
  border-radius:var(--pill);
  color:var(--paper);
  font-size:13px;
  font-weight:700;
  letter-spacing:.08em;
}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:4px;width:20px;}
.nav-toggle__bars span{display:block;height:2px;border-radius:2px;background:var(--brand-soft);transition:transform .16s var(--ease-out),opacity .16s var(--ease-out);}
.nav-toggle__bars span:nth-child(1){width:20px;}
.nav-toggle__bars span:nth-child(2){width:14px;}
.nav-toggle__bars span:nth-child(3){width:18px;}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars span:nth-child(1){transform:translateY(6px) rotate(45deg);width:20px;background:var(--pulse);}
.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);width:20px;background:var(--pulse);}

/* ---------- 页脚 ---------- */
.site-footer{
  position:relative;
  background:var(--ink);
  color:var(--paper);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;
  left:0;
  right:0;
  height:4px;
  background:linear-gradient(90deg,var(--accent) 0 22%,var(--brand) 22% 56%,var(--pulse) 56% 64%,var(--ink-deep) 64% 100%);
}
.footer-inner{
  position:relative;
  z-index:1;
  width:min(var(--shell),100% - (var(--gutter) * 2));
  margin-inline:auto;
  padding-block:clamp(46px,7vw,88px) clamp(30px,5vw,56px);
  display:grid;
  grid-template-columns:minmax(0,1.25fr) minmax(0,1fr);
  gap:clamp(28px,4.4vw,56px) clamp(24px,4vw,48px);
}
.footer-lead{grid-column:1;grid-row:1;}
.footer-kicker{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.28em;
  color:var(--brand-soft);
}
.footer-title{
  margin-top:18px;
  font-size:clamp(24px,3.4vw,38px);
  font-weight:800;
  line-height:1.25;
  letter-spacing:-.01em;
  max-width:22em;
}
.footer-note{margin-top:16px;font-size:14px;color:rgba(246,241,231,.7);max-width:34em;}
.footer-contact{
  grid-column:2;
  grid-row:1;
  justify-self:end;
  width:100%;
  max-width:420px;
  padding:clamp(20px,2.6vw,28px);
  border:1px solid rgba(127,211,238,.28);
  border-radius:var(--r-lg);
  background:rgba(23,162,214,.10);
}
.contact-label{font-size:13px;font-weight:700;letter-spacing:.08em;color:var(--brand-soft);}
.contact-row{display:flex;gap:12px;margin-top:12px;font-size:14px;line-height:1.6;}
.contact-key{
  flex:0 0 auto;
  width:3.6em;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:rgba(246,241,231,.58);
  padding-top:2px;
}
.contact-value{word-break:break-word;}
.footer-nav{
  grid-column:1 / -1;
  grid-row:2;
  display:grid;
  grid-template-columns:minmax(0,1.05fr) minmax(0,1fr) minmax(0,.85fr);
  gap:clamp(20px,3vw,40px);
  border-top:1px solid rgba(246,241,231,.16);
  padding-top:clamp(24px,3.4vw,36px);
}
.footer-col{padding-left:clamp(12px,1.8vw,20px);border-left:1px solid rgba(246,241,231,.14);}
.footer-col__title{display:flex;align-items:center;gap:10px;font-size:15px;font-weight:700;letter-spacing:.06em;color:var(--brand-soft);}
.num{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:700;
  letter-spacing:.1em;
  color:var(--ink);
  background:var(--pulse);
  border-radius:var(--pill);
  padding:2px 8px;
}
.footer-list{margin-top:8px;}
.footer-list a{display:inline-flex;align-items:center;min-height:44px;font-size:17px;font-weight:600;color:var(--paper);}
.footer-list a:hover{color:var(--pulse);text-decoration:none;}
.footer-vertical{
  position:absolute;
  right:0;
  top:clamp(46px,7vw,88px);
  writing-mode:vertical-rl;
  font-size:12px;
  letter-spacing:.24em;
  color:rgba(127,211,238,.75);
}
.footer-base{
  width:min(var(--shell),100% - (var(--gutter) * 2));
  margin-inline:auto;
  padding-block:20px clamp(26px,4vw,40px);
  border-top:1px solid rgba(246,241,231,.16);
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
}
.footer-legal{font-family:var(--font-mono);font-size:12px;letter-spacing:.08em;color:var(--brand-soft);}
.footer-update{font-size:12px;color:rgba(246,241,231,.72);max-width:62ch;}

/* 返回顶部 */
.to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:calc(clamp(16px,3vw,32px) + env(safe-area-inset-bottom,0px));
  z-index:50;
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:44px;
  padding:10px 20px;
  border:1px solid rgba(127,211,238,.36);
  border-radius:var(--pill);
  background:rgba(7,21,39,.9);
  color:var(--paper);
  font-size:14px;
  font-weight:700;
  letter-spacing:.04em;
  opacity:0;
  visibility:hidden;
  transform:translateY(16px);
  transition:opacity .32s var(--ease-out),transform .32s var(--ease-out),visibility .32s var(--ease-out);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none;}
.to-top__icon{font-family:var(--font-mono);color:var(--pulse);}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:12px 24px;
  border:1px solid transparent;
  border-radius:var(--pill);
  font-size:15px;
  font-weight:700;
  letter-spacing:.03em;
  transition:transform .16s var(--ease-out),box-shadow .16s var(--ease-out),background-color .16s var(--ease-out);
}
.btn:hover{text-decoration:none;transform:translateY(-1px);}
.btn--accent{background:var(--accent);color:#FFFFFF;}
.btn--accent:hover{box-shadow:0 10px 24px rgba(255,106,43,.32);}
.btn--brand{background:var(--brand);color:var(--ink);}
.btn--paper{background:var(--paper);color:var(--text);}
.btn--ghost{border-color:currentColor;background:transparent;color:inherit;}

/* ---------- 卡片与数据 ---------- */
.card{
  background:var(--paper-raise);
  border:1px solid var(--rule);
  border-radius:var(--r-md);
  padding:clamp(18px,2.4vw,26px);
}
.card--outline{background:transparent;box-shadow:none;}
.card--data{
  background:rgba(246,241,231,.06);
  border:1px solid rgba(127,211,238,.28);
  border-radius:var(--r-lg);
  color:var(--paper);
  padding:clamp(20px,2.6vw,30px);
  backdrop-filter:blur(6px);
}
.card--data .eyebrow{color:var(--brand-soft);}
.pill{
  display:inline-flex;
  align-items:center;
  gap:8px;
  min-height:32px;
  padding:5px 14px;
  border:1px solid var(--rule);
  border-radius:var(--pill);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--muted);
}
.band--ink .pill,.card--data .pill{border-color:rgba(127,211,238,.32);color:var(--brand-soft);}
.delta{
  display:inline-flex;
  align-items:center;
  gap:6px;
  font-family:var(--font-mono);
  font-weight:700;
  font-size:13px;
  letter-spacing:.1em;
}
.delta--up{color:var(--alert);}
.delta--down{color:var(--muted);}
.band--ink .delta--up,.card--data .delta--up{color:var(--accent);}
.band--ink .delta--down,.card--data .delta--down{color:var(--brand-soft);}

/* ---------- 图片容器 ---------- */
.figure{
  position:relative;
  display:block;
  width:100%;
  overflow:hidden;
  border-radius:var(--r-lg);
  background:var(--ink-deep);
}
.figure--16x9{aspect-ratio:16/9;}
.figure--4x5{aspect-ratio:4/5;}
.figure--1x1{aspect-ratio:1/1;}
.figure img{width:100%;height:100%;object-fit:cover;filter:saturate(.92);}
.figure[data-grid]::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    repeating-linear-gradient(0deg,rgba(127,211,238,.22) 0 1px,transparent 1px 44px),
    repeating-linear-gradient(90deg,rgba(127,211,238,.22) 0 1px,transparent 1px 44px);
  mix-blend-mode:screen;
}
.figure__cap{
  position:absolute;
  left:16px;
  bottom:16px;
  z-index:2;
  padding:6px 14px;
  border-radius:var(--pill);
  background:rgba(7,21,39,.76);
  color:var(--paper);
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
}

/* ---------- 面包屑 ---------- */
.breadcrumb{font-size:13px;color:var(--muted);}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px;}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px;}
.breadcrumb li + li::before{content:"/";color:var(--rule);}
.breadcrumb a{color:var(--text);text-decoration:underline;text-decoration-color:var(--brand);text-decoration-thickness:2px;text-underline-offset:3px;}
.band--ink .breadcrumb{color:var(--brand-soft);}
.band--ink .breadcrumb a{color:var(--paper);text-decoration-color:var(--brand-soft);}

/* ---------- 章节目录 ---------- */
.toc{position:sticky;top:calc(var(--header-h-scrolled) + 24px);}
.toc a{
  display:flex;
  align-items:center;
  gap:10px;
  min-height:44px;
  padding:6px 0;
  border-bottom:1px solid var(--rule);
  font-size:14px;
  color:var(--muted);
}
.toc a::before{
  content:"";
  width:7px;
  height:7px;
  flex:0 0 auto;
  border-radius:50%;
  background:transparent;
}
.toc a:hover{text-decoration:none;color:var(--text);}
.toc a[aria-current="true"]{color:var(--text);font-weight:700;}
.toc a[aria-current="true"]::before{background:var(--pulse);box-shadow:0 0 0 4px rgba(180,255,87,.25);}

/* ---------- 显隐动效 ---------- */
html.js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .32s var(--ease-out),transform .32s var(--ease-out);
}
html.js [data-reveal][data-shown]{opacity:1;transform:none;}

/* ---------- 响应式 ---------- */
@media (max-width:1024px){
  .footer-vertical{display:none;}
}
@media (max-width:900px){
  .header-cta{display:none;}
  .nav-toggle{display:inline-flex;}
  .site-nav{
    position:fixed;
    inset:0;
    z-index:70;
    margin-left:0;
    display:flex;
    flex-direction:column;
    justify-content:center;
    padding:calc(var(--header-h) + 28px) var(--gutter) 48px;
    background:var(--ink);
    opacity:0;
    visibility:hidden;
    transform:translateY(-14px);
    pointer-events:none;
    transition:opacity .32s var(--ease-out),transform .32s var(--ease-out),visibility .32s var(--ease-out);
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
    pointer-events:auto;
  }
  .nav-list{flex-direction:column;align-items:flex-start;gap:4px;width:100%;}
  .nav-link{
    font-size:clamp(26px,8vw,38px);
    font-weight:800;
    letter-spacing:-.02em;
    min-height:56px;
    color:var(--paper);
  }
  .nav-idx{font-size:13px;color:var(--brand-soft);}
  .nav-link::after{bottom:6px;}
  .nav-action{
    display:inline-flex;
    align-items:center;
    justify-content:center;
    align-self:flex-start;
    min-height:48px;
    margin-top:28px;
    padding:0 26px;
    border-radius:var(--pill);
    background:var(--accent);
    color:#FFFFFF;
    font-weight:700;
    font-size:16px;
  }
  .nav-action:hover{text-decoration:none;}
  .footer-inner{grid-template-columns:minmax(0,1fr);}
  .footer-lead{grid-column:1;grid-row:1;}
  .footer-contact{grid-column:1;grid-row:2;justify-self:start;max-width:none;}
  .footer-nav{grid-row:3;}
}
@media (max-width:680px){
  .brand-tag{display:none;}
  .footer-nav{grid-template-columns:minmax(0,1fr);gap:8px;}
  .footer-col{border-left:0;padding-left:0;border-top:1px solid rgba(246,241,231,.14);padding-top:14px;}
  .footer-col:first-child{border-top:0;padding-top:0;}
  .footer-base{flex-direction:column;align-items:flex-start;}
  .to-top{right:16px;bottom:calc(16px + env(safe-area-inset-bottom,0px));}
}

@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;}
  .to-top{transform:none;}
  .header-cta:hover,.btn:hover{transform:none;}
}