/* ===================================================================
   三亿赛场 · 共享样式 /assets/site.css
   骨架：左侧 72px 数字轨道 + 右侧连续画布；极夜底 + 1px 精密网格
   =================================================================== */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%}
@media (prefers-reduced-motion:no-preference){html{scroll-behavior:smooth}}
body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,figure,blockquote,dl,dt,dd,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
button,input,select,textarea{font:inherit;color:inherit;background:none;border:0}
button{cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
[hidden]{display:none!important}

/* ---------- 2. 设计令牌 ---------- */
:root{
  --ink:#05070C;
  --navy:#0B1424;
  --frost:#F2F6FF;
  --ice:#4FA8FF;
  --aurora:#35E0A1;
  --signal:#FF7A1A;
  --neon:#8AF0FF;
  --steel:#7C8798;
  --line:#1E2A3A;
  --mist:rgba(79,168,255,.14);
  --rail-w:72px;
  --head-h:64px;
  --sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Hiragino Sans GB","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:"JetBrains Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,"Courier New",monospace;
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  background:var(--ink);
  color:var(--frost);
  min-height:100vh;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(30,42,58,.6) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(30,42,58,.6) 1px,transparent 1px);
  background-size:80px 80px;
  opacity:.45;
}
:focus-visible{outline:2px solid var(--neon);outline-offset:2px}

.display{font-size:clamp(48px,9vw,132px);font-weight:900;line-height:.92;letter-spacing:-.02em}
.h2{font-size:clamp(28px,4vw,56px);font-weight:900;line-height:1.06;letter-spacing:-.02em}
.h3{font-size:clamp(19px,2.2vw,26px);font-weight:800;line-height:1.28;letter-spacing:-.01em}
.eyebrow{font-family:var(--mono);font-size:12px;letter-spacing:.24em;color:var(--ice)}
.lede{font-size:clamp(17px,1.5vw,20px);line-height:1.75;color:var(--frost);opacity:.86;max-width:34em}
.prose{max-width:38em;line-height:1.75;color:var(--frost);opacity:.82}
.prose p+p{margin-top:1em}
.mono{font-family:var(--mono);font-variant-numeric:tabular-nums;letter-spacing:.02em}

/* ---------- 4. 容器与骨架 ---------- */
.wrap{width:100%;max-width:1280px;margin-inline:auto;padding-inline:clamp(18px,4vw,56px)}
.site-main{display:block;padding-left:var(--rail-w);padding-top:var(--head-h);min-height:60vh}
.section{padding-block:clamp(56px,8vw,116px);position:relative}
.section--tint{background:var(--navy)}
.band{background:var(--navy)}
.band--ink{background:var(--ink)}
.band--mist{background:linear-gradient(180deg,rgba(79,168,255,.09),rgba(79,168,255,0))}
.section__head{display:flex;flex-wrap:wrap;gap:14px 32px;align-items:flex-end;justify-content:space-between;margin-bottom:clamp(24px,4vw,48px)}
.rule{height:1px;background:var(--line);border:0}

.grid-field{
  position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(30,42,58,.75) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(30,42,58,.75) 1px,transparent 1px);
  background-size:64px 64px;
}
.slice-field{
  position:absolute;inset:-12% -6%;pointer-events:none;
  background-image:repeating-linear-gradient(78deg,rgba(30,42,58,.85) 0 1px,transparent 1px 76px);
}

/* ---------- 5. 跳过链接 ---------- */
.skip-link{
  position:fixed;top:8px;left:8px;z-index:90;
  padding:10px 18px;background:var(--neon);color:var(--ink);
  font-size:13px;font-weight:900;
  transform:translateY(-180%);
  transition:transform .16s ease;
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 6. 顶部条 ---------- */
.site-head__bar{
  position:fixed;top:0;right:0;left:var(--rail-w);z-index:60;
  height:var(--head-h);
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding-inline:clamp(16px,3vw,36px);
  background:linear-gradient(180deg,rgba(5,7,12,.95),rgba(5,7,12,.74));
  backdrop-filter:blur(10px);
  border-bottom:1px solid transparent;
  transition:height .2s ease,border-color .2s ease,background .2s ease;
}
.site-head[data-condensed] .site-head__bar{
  height:52px;
  border-bottom-color:var(--line);
  background:rgba(5,7,12,.97);
}
.site-head__brand{display:flex;align-items:center;gap:16px;min-width:0}
.brand-mark{display:inline-flex;align-items:center;gap:10px}
.brand-mark__glyph{
  display:grid;place-items:center;width:30px;height:30px;
  border:1px solid var(--ice);background:rgba(79,168,255,.08);
  color:var(--ice);font-size:11px;line-height:1;letter-spacing:0;
  transition:background .16s ease,color .16s ease;
}
.brand-mark__text{font-size:17px;font-weight:900;letter-spacing:.02em}
.brand-mark:hover .brand-mark__glyph{background:var(--ice);color:var(--ink)}
.site-head__section{
  padding-left:16px;border-left:1px solid var(--line);
  font-family:var(--mono);font-size:12px;letter-spacing:.16em;color:var(--steel);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.site-head__meta{display:flex;align-items:center;gap:14px}
.site-head__season{font-size:11px;letter-spacing:.14em;color:var(--steel);white-space:nowrap}
.site-head__progress{
  position:absolute;left:0;right:0;bottom:-1px;height:2px;
  background:linear-gradient(90deg,var(--ice),var(--neon));
  transform:scaleX(0);transform-origin:0 50%;
  transition:transform .1s linear;
}

/* ---------- 7. 按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:10px;
  padding:11px 20px;border:1px solid var(--line);
  font-size:14px;font-weight:800;letter-spacing:.02em;
  color:var(--frost);background:transparent;
  transition:background .16s ease,border-color .16s ease,color .16s ease,transform .12s ease;
}
.btn:hover{border-color:var(--ice);background:var(--mist)}
.btn:active{transform:translateY(1px)}
.btn--signal{border-color:var(--signal);background:var(--signal);color:#0A0A0A;font-weight:900}
.btn--signal:hover{background:#FF8F3C;border-color:#FF8F3C;color:#0A0A0A}
.btn--ghost{border-color:var(--line);color:var(--steel)}
.btn--ghost:hover{color:var(--frost);border-color:var(--ice)}
.btn--block{width:100%}

/* ---------- 8. 移动导航按钮 ---------- */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:9px 12px;border:1px solid var(--line);
  background:rgba(11,20,36,.75);color:var(--frost);
  font-size:12px;font-weight:800;letter-spacing:.14em;
  transition:border-color .16s ease,background .16s ease;
}
.nav-toggle:hover{border-color:var(--ice);background:var(--mist)}
.nav-toggle__bars{position:relative;display:block;width:18px;height:12px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1px;background:var(--frost);
  transition:transform .18s ease,top .18s ease;
}
.nav-toggle__bars::before{top:2px}
.nav-toggle__bars::after{top:9px}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:5px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{top:5px;transform:rotate(-45deg)}

/* ---------- 9. 侧边轨道 ---------- */
.rail{
  position:fixed;top:0;bottom:0;left:0;z-index:58;
  width:var(--rail-w);
  display:flex;flex-direction:column;
  background:var(--navy);
  border-right:1px solid var(--line);
  padding:8px 0 16px;
}
.rail__crest{
  display:block;align-self:center;
  writing-mode:vertical-rl;text-orientation:upright;
  padding:6px 0 14px;margin-bottom:8px;
  font-size:10px;letter-spacing:.28em;color:var(--steel);
  border-bottom:1px solid var(--line);
}
.rail__caption{display:none}
.rail__list{display:flex;flex-direction:column;width:100%}
.rail__item{width:100%}
.rail__link{
  position:relative;display:flex;align-items:center;justify-content:center;
  width:100%;height:54px;
  border-left:2px solid transparent;
  transition:background .16s ease,border-color .16s ease;
}
.rail__idx{font-size:12px;color:var(--steel);transition:color .16s ease}
.rail__link:hover{background:var(--mist);border-left-color:var(--ice)}
.rail__link:hover .rail__idx{color:var(--frost)}
.rail__link[aria-current="page"]{background:var(--mist);border-left-color:var(--ice)}
.rail__link[aria-current="page"] .rail__idx{color:var(--ice);font-weight:700}
.rail__label{
  position:absolute;left:calc(100% + 10px);top:50%;
  transform:translate(-6px,-50%);
  white-space:nowrap;padding:7px 12px;
  background:var(--navy);border:1px solid var(--line);
  font-size:13px;font-weight:700;color:var(--frost);
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .16s ease,transform .16s ease,visibility .16s;
}
.rail__link:hover .rail__label,
.rail__link:focus-visible .rail__label{
  opacity:1;visibility:visible;transform:translate(0,-50%);
}
.rail__link[aria-current="page"] .rail__label{color:var(--ice)}
.rail__foot{
  display:flex;align-items:center;justify-content:center;gap:8px;
  margin-top:auto;padding:12px 8px;
}
.rail__pulse{
  width:8px;height:8px;background:var(--aurora);
  box-shadow:0 0 0 3px rgba(53,224,161,.18);
}
.rail__note{display:none}
.rail-scrim{
  position:fixed;inset:0;z-index:50;
  background:rgba(5,7,12,.76);
  backdrop-filter:blur(2px);
  animation:scrim-in .2s ease;
}
@keyframes scrim-in{from{opacity:0}to{opacity:1}}
@media (min-width:901px){.rail-scrim{display:none}}

/* ---------- 10. 面包屑 ---------- */
.crumb{
  display:flex;flex-wrap:wrap;align-items:center;gap:8px;
  font-family:var(--mono);font-size:12px;letter-spacing:.08em;color:var(--steel);
}
.crumb__item{display:inline-flex;align-items:center;gap:8px}
.crumb a{transition:color .16s ease}
.crumb a:hover{color:var(--ice)}
.crumb__sep{color:var(--line)}

/* ---------- 11. 网格 ---------- */
.grid{display:grid;gap:clamp(18px,3vw,36px);grid-template-columns:1fr}
.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--mirror{grid-template-columns:1fr auto 1fr}

/* ---------- 12. 组件：索引行 ---------- */
.index-list{border-top:1px solid var(--line)}
.index-list__row{
  display:grid;grid-template-columns:64px 1fr auto;
  gap:clamp(12px,2vw,28px);align-items:baseline;
  padding:18px 6px;border-bottom:1px solid var(--line);
  transition:background .16s ease,padding-left .16s ease;
}
.index-list__row:hover{background:var(--mist);padding-left:18px}
.index-list__idx{font-family:var(--mono);font-size:13px;color:var(--ice)}
.index-list__title{font-size:clamp(17px,2vw,22px);font-weight:800;line-height:1.3}
.index-list__meta{font-family:var(--mono);font-size:12px;color:var(--steel);white-space:nowrap}

/* ---------- 13. 组件：数据与标签 ---------- */
.stat{display:flex;flex-direction:column;gap:2px}
.stat__value{font-family:var(--mono);font-size:clamp(24px,3vw,40px);font-weight:700;line-height:1.1;color:var(--frost)}
.stat__label{font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--steel)}
.bar{position:relative;height:6px;background:var(--line);overflow:hidden}
.bar__fill{display:block;height:100%;width:var(--v,50%);background:var(--ice);transition:width .32s cubic-bezier(.22,.7,.25,1)}
.bar--aurora .bar__fill{background:var(--aurora)}
.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:3px 9px;border:1px solid var(--line);
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;color:var(--steel);
}
.tag--ice{border-color:rgba(79,168,255,.55);color:var(--ice)}
.tag--aurora{border-color:rgba(53,224,161,.55);color:var(--aurora)}
.tag--signal{border-color:rgba(255,122,26,.6);color:var(--signal)}
.ribbon{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:rgba(11,20,36,.7)}
.ribbon__list{display:flex;flex-wrap:wrap;gap:0}
.ribbon__item{flex:1 1 180px;padding:16px 18px;border-right:1px solid var(--line);min-width:0}
.ribbon__item:last-child{border-right:0}
.ribbon__value{display:block;font-family:var(--mono);font-size:clamp(18px,2.2vw,26px);font-weight:700;color:var(--frost)}
.ribbon__key{display:block;font-family:var(--mono);font-size:11px;letter-spacing:.14em;color:var(--steel)}

/* ---------- 14. 组件：筛选片 ---------- */
.chips{display:flex;flex-wrap:wrap;gap:8px}
.chip{
  padding:7px 14px;border:1px solid var(--line);
  font-size:13px;font-weight:700;color:var(--steel);
  transition:background .16s ease,border-color .16s ease,color .16s ease;
}
.chip:hover{color:var(--frost);border-color:var(--ice)}
.chip[aria-pressed="true"],.chip.is-active{
  border-color:var(--ice);color:var(--frost);background:var(--mist);
}

/* ---------- 15. 组件：图片容器 ---------- */
.media{
  position:relative;display:block;overflow:hidden;
  background:var(--navy);border:1px solid var(--line);
  aspect-ratio:16/9;
}
.media img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(to right,rgba(30,42,58,.5) 1px,transparent 1px),
    linear-gradient(to bottom,rgba(30,42,58,.5) 1px,transparent 1px);
  background-size:48px 48px;
  opacity:.55;
}
.media--wide{aspect-ratio:21/9}
.media--square{aspect-ratio:1/1}
.media--tall{aspect-ratio:3/4}
.media__cap{
  position:absolute;left:0;bottom:0;z-index:2;
  padding:8px 12px;background:rgba(5,7,12,.82);
  font-family:var(--mono);font-size:11px;letter-spacing:.1em;color:var(--steel);
}

/* ---------- 16. 页脚 ---------- */
.site-foot{
  margin-left:var(--rail-w);
  background:var(--navy);
  border-top:1px solid var(--line);
  padding-top:clamp(44px,6vw,80px);
}
.foot__grid{
  display:grid;grid-template-columns:1.5fr 1fr 1.4fr 1fr;
  gap:clamp(24px,4vw,56px);
  padding-bottom:clamp(32px,5vw,64px);
}
.foot__col{min-width:0}
.foot__brand{font-size:22px;font-weight:900;letter-spacing:.02em}
.foot__tag{margin-top:10px;max-width:28em;font-size:14px;line-height:1.75;color:var(--steel)}
.foot__meta{margin-top:18px;font-size:11px;letter-spacing:.18em;color:var(--steel)}
.foot__title{
  padding-bottom:12px;margin-bottom:14px;
  border-bottom:1px solid var(--line);
  font-family:var(--mono);font-size:13px;font-weight:800;letter-spacing:.18em;color:var(--frost);
}
.foot__list li+li{margin-top:2px}
.foot__link{
  position:relative;display:inline-block;padding:7px 0;
  font-size:14px;color:var(--steel);
  transition:color .16s ease;
}
.foot__link::after{
  content:"";position:absolute;left:0;bottom:3px;height:1px;width:0;
  background:var(--ice);transition:width .16s ease;
}
.foot__link:hover{color:var(--frost)}
.foot__link:hover::after{width:100%}
.foot__link--sm{font-size:12px;padding:2px 0}
.foot__contact li{
  display:grid;grid-template-columns:52px 1fr;gap:10px;align-items:start;
  padding:8px 0;border-bottom:1px solid rgba(30,42,58,.65);
}
.foot__key{font-size:11px;letter-spacing:.14em;color:var(--ice);padding-top:3px}
.foot__val{font-size:14px;line-height:1.7;color:var(--frost);opacity:.86;word-break:break-word}
.foot__hint{margin-top:12px;font-size:12px;line-height:1.7;color:var(--steel)}
.foot__findlabel{display:block;margin-bottom:8px;font-size:11px;letter-spacing:.14em;color:var(--steel)}
.foot__findinput{
  width:100%;padding:11px 12px;
  background:rgba(5,7,12,.65);border:1px solid var(--line);
  font-size:14px;color:var(--frost);
  transition:border-color .16s ease,background .16s ease;
}
.foot__findinput::placeholder{color:var(--steel)}
.foot__findinput:focus{border-color:var(--ice);background:rgba(79,168,255,.08)}
.foot__empty{margin-top:8px;font-size:12px;color:var(--signal)}
.foot__quick{display:flex;flex-wrap:wrap;gap:8px;margin-top:16px}
.foot__quicklink{
  padding:7px 12px;border:1px solid var(--line);
  font-size:12px;color:var(--steel);
  transition:border-color .16s ease,color .16s ease,background .16s ease;
}
.foot__quicklink:hover{border-color:var(--ice);color:var(--frost);background:var(--mist)}
.foot__bottom{
  display:flex;flex-wrap:wrap;gap:14px 24px;
  align-items:center;justify-content:space-between;
  padding:20px 0 30px;border-top:1px solid var(--line);
}
.foot__legal{display:flex;flex-wrap:wrap;align-items:center;gap:10px 18px;font-size:12px;color:var(--steel)}
.foot__copy{font-size:11px;letter-spacing:.12em;color:var(--steel)}

/* ---------- 17. 返回顶部（JS 注入） ---------- */
.to-top{
  position:fixed;right:clamp(14px,3vw,28px);bottom:clamp(14px,3vw,28px);z-index:62;
  display:inline-flex;align-items:center;gap:8px;
  padding:10px 14px;border:1px solid var(--line);
  background:rgba(11,20,36,.94);color:var(--frost);
  font-size:11px;letter-spacing:.16em;
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .2s ease,transform .2s ease,visibility .2s,border-color .16s ease,color .16s ease;
}
.to-top[data-shown]{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--ice);color:var(--ice)}
.to-top__arrow{
  width:0;height:0;display:block;
  border-left:5px solid transparent;border-right:5px solid transparent;
  border-bottom:6px solid currentColor;
}

/* ---------- 18. 显现 ---------- */
html.js [data-reveal]{opacity:0;transform:translateY(12px);transition:opacity .42s ease,transform .42s ease}
html.js [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 19. 响应式 ---------- */
@media (max-width:1100px){
  .site-head__season{display:none}
  .foot__grid{grid-template-columns:1.4fr 1fr 1.4fr}
  .foot__col--brand{grid-column:1 / -1}
}

@media (max-width:1024px){
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--mirror{grid-template-columns:1fr}
}

@media (max-width:900px){
  :root{--rail-w:0px;--head-h:58px}
  .site-head__bar{left:0;padding-inline:16px;gap:10px}
  .site-head__section{display:none}
  .brand-mark__text{font-size:16px}
  .nav-toggle{display:inline-flex}
  html.nav-open,html.nav-open body{overflow:hidden}

  .rail{
    width:min(320px,86vw);
    transform:translateX(-100%);
    padding-top:calc(var(--head-h) + 10px);
    overflow-y:auto;
    transition:transform .26s cubic-bezier(.22,.7,.25,1);
  }
  .rail[data-open]{transform:translateX(0)}
  .rail__crest{display:none}
  .rail__caption{display:block;padding:0 20px 10px;font-size:11px;letter-spacing:.24em;color:var(--steel)}
  .rail__list{padding-bottom:8px}
  .rail__item{border-bottom:1px solid var(--line)}
  .rail__link{height:auto;justify-content:flex-start;gap:14px;padding:15px 20px}
  .rail__idx{color:var(--ice)}
  .rail__label{
    position:static;opacity:1;visibility:visible;transform:none;
    padding:0;background:none;border:0;pointer-events:auto;
    font-size:15px;font-weight:700;color:var(--frost);
  }
  .rail__link[aria-current="page"]{border-left-color:var(--ice);background:var(--mist)}
  .rail__link[aria-current="page"] .rail__label{color:var(--ice)}
  .rail__foot{justify-content:flex-start;padding:16px 20px;margin-top:0}
  .rail__note{display:inline;font-size:12px;color:var(--steel)}

  .site-main{padding-inline:0}
  .site-foot{margin-left:0}
  .foot__grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .foot__col--brand{grid-column:1 / -1}
  .foot__bottom{flex-direction:column;align-items:flex-start}
}

@media (max-width:720px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .index-list__row{grid-template-columns:48px 1fr;grid-template-areas:"idx title" ". meta";row-gap:6px}
  .index-list__idx{grid-area:idx}
  .index-list__title{grid-area:title}
  .index-list__meta{grid-area:meta}
  .ribbon__item{flex:1 1 100%;border-right:0;border-bottom:1px solid var(--line)}
  .ribbon__item:last-child{border-bottom:0}
}

@media (max-width:560px){
  .foot__grid{grid-template-columns:1fr}
  .brand-mark__glyph{width:26px;height:26px;font-size:10px}
}

/* ---------- 20. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
    scroll-behavior:auto!important;
  }
  html.js [data-reveal]{opacity:1;transform:none}
  .site-head__bar{transition:none}
}