/* ============================================================
   三亿赛事 · 共享样式表 /assets/site.css
   岩墨底 · 青花蓝 · 竞技橙 · 霓虹青绿 · 柠檬黄
   ============================================================ */

/* ---------- 1. 设计令牌 ---------- */
:root{
  color-scheme: dark;

  --c-ink:#101418;
  --c-slate:#1B2026;
  --c-cream:#F2EFE7;
  --c-blue:#1F4E8C;
  --c-blue-soft:#5C8DC4;
  --c-orange:#E4572E;
  --c-neon:#38E0B0;
  --c-lemon:#F5D547;
  --c-moss:#5F7152;
  --c-clay:#A8552F;

  --c-cream-dim:rgba(242,239,231,.68);
  --c-cream-faint:rgba(242,239,231,.42);
  --line:rgba(242,239,231,.13);
  --line-strong:rgba(242,239,231,.26);
  --card:rgba(27,32,38,.66);
  --card-hi:rgba(27,32,38,.92);

  --font-body:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans SC","Helvetica Neue",Arial,sans-serif;
  --font-display:var(--font-body);
  --font-mono:ui-monospace,SFMono-Regular,"SF Mono",Menlo,Consolas,"DejaVu Sans Mono",monospace;

  --fs-xs:.76rem;
  --fs-sm:.88rem;
  --fs-base:clamp(1rem,.96rem + .18vw,1.19rem);
  --fs-md:clamp(1.12rem,1.03rem + .4vw,1.42rem);
  --fs-lg:clamp(1.48rem,1.2rem + 1.4vw,2.4rem);
  --fs-xl:clamp(1.95rem,1.4rem + 3vw,3.6rem);
  --fs-2xl:clamp(2.6rem,1.6rem + 6vw,5.8rem);
  --fs-3xl:clamp(3.1rem,1.4rem + 9vw,7.6rem);

  --sp-1:8px;
  --sp-2:16px;
  --sp-3:24px;
  --sp-4:32px;
  --sp-5:48px;
  --sp-6:64px;
  --sp-7:96px;
  --sp-8:128px;

  --shell:1320px;
  --gutter:clamp(20px,4.2vw,64px);
  --header-h:84px;
  --header-h-sm:62px;
  --radius:2px;
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,li,figure,figcaption,blockquote,dl,dd,fieldset{margin:0;padding:0}
ul,ol{list-style:none}
img,svg,video,canvas{display:block;max-width:100%}
button,input,select,textarea{font:inherit;color:inherit}
button{background:none;border:0;cursor:pointer}
a{color:inherit;text-decoration:none}
table{border-collapse:collapse;width:100%}
:focus{outline:none}
:focus-visible{outline:2px solid var(--c-lemon);outline-offset:3px;border-radius:1px}
::selection{background:var(--c-lemon);color:var(--c-ink)}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:var(--fs-base);
  line-height:1.75;
  background:var(--c-ink);
  color:var(--c-cream-dim);
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
/* 极细扫描质感，浮于内容之上但不参与交互 */
body::after{
  content:"";
  position:fixed;
  inset:0;
  z-index:60;
  pointer-events:none;
  opacity:.45;
  background-image:repeating-linear-gradient(0deg,rgba(242,239,231,.03) 0 1px,rgba(0,0,0,0) 1px 5px);
}
h1,h2,h3,h4{font-family:var(--font-display);font-weight:800;color:var(--c-cream);line-height:1.14;letter-spacing:-.012em}
h1{font-size:var(--fs-2xl);line-height:1.02;letter-spacing:-.022em}
h2{font-size:var(--fs-lg)}
h3{font-size:var(--fs-md)}
p{max-width:70ch}
strong{color:var(--c-cream);font-weight:700}
small{font-size:var(--fs-xs)}

#main-content{display:block;scroll-margin-top:calc(var(--header-h) + 12px)}

/* ---------- 4. 布局骨架 ---------- */
.container{width:100%;max-width:var(--shell);margin-inline:auto;padding-inline:var(--gutter)}
.container--narrow{max-width:900px}
.container--read{max-width:760px}
.section{padding-block:clamp(48px,7vw,112px)}
.section--tight{padding-block:clamp(28px,4vw,60px)}
.section--slate{background:var(--c-slate)}
.section--clay{background:rgba(168,85,47,.07);border-block:1px solid var(--line)}
.section--blue{background:rgba(31,78,140,.14);border-block:1px solid var(--line)}
.rule{height:1px;border:0;background:var(--line);margin-block:var(--sp-4)}

.split{display:grid;grid-template-columns:5fr 7fr;gap:clamp(24px,4vw,72px);align-items:start}
.split--reverse{grid-template-columns:7fr 5fr}
.grid{display:grid;gap:clamp(16px,2.4vw,32px)}
.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))}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:var(--sp-3);
  padding-bottom:var(--sp-3);
  margin-bottom:var(--sp-5);
  border-bottom:1px solid var(--line);
}

/* ---------- 5. 文字组件 ---------- */
.eyebrow{
  display:block;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.26em;
  text-transform:uppercase;
  color:var(--c-blue-soft);
  margin-bottom:var(--sp-2);
}
.display{font-size:var(--fs-3xl);font-weight:800;line-height:1;letter-spacing:-.03em;color:var(--c-cream)}
.section-title{font-size:var(--fs-lg);font-weight:800;color:var(--c-cream)}
.lead{font-size:var(--fs-md);line-height:1.68;color:var(--c-cream-dim);max-width:58ch}
.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.04em}
.hl{color:var(--c-lemon);font-family:var(--font-mono);font-variant-numeric:tabular-nums}
.mark{background:linear-gradient(transparent 64%,rgba(245,213,71,.34) 64%);color:var(--c-cream);padding:0 1px}
.side-note{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.24em;
  color:var(--c-moss);
  writing-mode:vertical-rl;
  text-orientation:mixed;
  line-height:1.2;
}
.stat{display:flex;flex-direction:column;gap:6px}
.stat-value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(2rem,1.4rem + 3vw,3.4rem);
  line-height:1;
  letter-spacing:.02em;
  color:var(--c-lemon);
}
.stat-label{font-size:.82rem;color:var(--c-cream-faint);letter-spacing:.06em}
.stat-note{font-size:.8rem;color:var(--c-moss)}

/* ---------- 6. 卡片与字段表 ---------- */
.card{
  position:relative;
  background:var(--card);
  border:1px solid var(--line);
  padding:clamp(20px,2.4vw,32px);
  transition:border-color .3s ease,background .3s ease;
}
.card:hover{border-color:var(--line-strong);background:var(--card-hi)}
.card--edge::before{
  content:"";
  position:absolute;
  left:0;top:0;
  width:2px;height:0;
  background:var(--c-neon);
  transition:height .42s ease;
}
.card--edge:hover::before{height:100%}

.field{display:grid;grid-template-columns:minmax(88px,auto) 1fr;gap:10px var(--sp-3);padding-block:12px;border-bottom:1px solid var(--line)}
.field:last-child{border-bottom:0}
.field-key{font-family:var(--font-mono);font-size:.74rem;letter-spacing:.14em;color:var(--c-blue-soft);padding-top:.35em}
.field-value{color:var(--c-cream);font-size:.98rem}

/* ---------- 7. 按钮与标签 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:14px 26px;
  font-size:.94rem;
  letter-spacing:.04em;
  border:1px solid transparent;
  border-radius:1px;
  transition:background .25s ease,color .25s ease,border-color .25s ease,transform .25s ease;
}
.btn--primary{background:var(--c-orange);border-color:var(--c-orange);color:var(--c-cream)}
.btn--primary:hover{background:transparent;color:var(--c-orange)}
.btn--blue{background:var(--c-blue);border-color:var(--c-blue);color:var(--c-cream)}
.btn--blue:hover{background:transparent;color:var(--c-blue-soft);border-color:var(--c-blue-soft)}
.btn--ghost{border-color:var(--line-strong);color:var(--c-cream)}
.btn--ghost:hover{border-color:var(--c-neon);color:var(--c-neon)}
.btn__arrow{font-family:var(--font-mono);transition:transform .25s ease}
.btn:hover .btn__arrow{transform:translateX(4px)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:5px 12px;
  border:1px solid var(--line-strong);
  border-radius:1px;
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.16em;
  color:var(--c-cream-dim);
  white-space:nowrap;
}
.tag--neon{border-color:rgba(56,224,176,.5);color:var(--c-neon)}
.tag--orange{border-color:rgba(228,87,46,.55);color:var(--c-orange)}
.tag--lemon{border-color:rgba(245,213,71,.45);color:var(--c-lemon)}
.tag--moss{border-color:rgba(95,113,82,.7);color:#9DB48A;background:rgba(95,113,82,.14)}
.tag--clay{border-color:rgba(168,85,47,.6);color:#D98A63;background:rgba(168,85,47,.12)}

/* ---------- 8. 面包屑 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  padding-block:18px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  color:var(--c-cream-faint);
}
.breadcrumb a{transition:color .2s ease}
.breadcrumb a:hover{color:var(--c-neon)}
.breadcrumb-sep{color:var(--line-strong)}
.breadcrumb [aria-current="page"]{color:var(--c-cream-dim)}

/* ---------- 9. 图片容器（页面阶段放置资源） ---------- */
.media{
  position:relative;
  overflow:hidden;
  background:var(--c-slate);
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.media img,.media video{width:100%;height:100%;object-fit:cover;display:block}
.media--wide{aspect-ratio:16/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media--strip{aspect-ratio:21/9}
.media--placeholder{
  display:grid;
  place-items:center;
  background-image:repeating-linear-gradient(135deg,rgba(242,239,231,.05) 0 1px,rgba(0,0,0,0) 1px 12px);
}
.media--placeholder::before{
  content:"IMAGE";
  font-family:var(--font-mono);
  font-size:.68rem;
  letter-spacing:.32em;
  color:var(--c-cream-faint);
}
.media--scan::after{
  content:"";
  position:absolute;
  inset:auto 0 0 0;
  height:34%;
  background:linear-gradient(180deg,rgba(56,224,176,0) 0%,rgba(56,224,176,.18) 100%);
  pointer-events:none;
}
.media-caption{
  margin-top:10px;
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.1em;
  color:var(--c-cream-faint);
}

/* ---------- 10. 页头 ---------- */
.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-64px;
  z-index:120;
  padding:12px 20px;
  background:var(--c-lemon);
  color:var(--c-ink);
  font-size:.86rem;
  font-weight:700;
  transition:top .22s ease;
}
.skip-link:focus{top:12px}

.site-header{
  position:sticky;
  top:0;
  z-index:80;
  background:linear-gradient(180deg,rgba(16,20,24,.95) 0%,rgba(16,20,24,.7) 58%,rgba(16,20,24,0) 100%);
  transition:background .35s ease,box-shadow .35s ease;
}
.site-header.is-solid{
  background:rgba(16,20,24,.97);
  box-shadow:0 1px 0 var(--line),0 22px 44px -34px rgba(0,0,0,.95);
}
.header-inner{
  display:flex;
  align-items:center;
  gap:clamp(14px,2.6vw,44px);
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding-inline:var(--gutter);
  min-height:var(--header-h);
  transition:min-height .3s ease;
}
.site-header.is-solid .header-inner{min-height:var(--header-h-sm)}

.brand{display:flex;flex-direction:column;gap:1px;flex:0 0 auto;padding-block:8px}
.footer-brand{display:flex;flex-direction:column;gap:1px}
.brand-mark{
  font-family:var(--font-display);
  font-size:1.24rem;
  font-weight:800;
  letter-spacing:.08em;
  line-height:1.1;
  color:var(--c-cream);
}
.brand-en{
  font-family:var(--font-mono);
  font-size:.58rem;
  letter-spacing:.3em;
  color:var(--c-blue-soft);
  text-transform:uppercase;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:10px 14px;
  border:1px solid var(--line-strong);
  border-radius:1px;
  font-family:var(--font-mono);
  font-size:.74rem;
  letter-spacing:.18em;
  color:var(--c-cream);
  transition:border-color .25s ease,color .25s ease;
}
.nav-toggle:hover{border-color:var(--c-neon);color:var(--c-neon)}
.nav-toggle-bars{position:relative;display:block;width:18px;height:10px}
.nav-toggle-bars::before,.nav-toggle-bars::after{
  content:"";
  position:absolute;
  left:0;
  width:100%;
  height:1px;
  background:var(--c-neon);
  transition:transform .3s ease,top .3s ease;
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{top:8px}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars::after{top:4px;transform:rotate(-45deg)}

.site-nav{display:flex;align-items:center;gap:clamp(10px,1.8vw,28px);margin-left:auto}
.nav-list{display:flex;align-items:center;gap:clamp(2px,1.2vw,20px)}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:10px 4px;
  font-size:.94rem;
  letter-spacing:.02em;
  color:var(--c-cream-dim);
  white-space:nowrap;
  transition:color .22s ease;
}
.nav-link::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  bottom:2px;
  height:1px;
  background:var(--c-neon);
  transform:scaleX(0);
  transform-origin:left center;
  transition:transform .28s ease;
}
.nav-link:hover,.nav-link:focus-visible{color:var(--c-cream)}
.nav-link:hover::after,.nav-link:focus-visible::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--c-cream)}
.nav-link[aria-current="page"]::after{
  transform:scaleX(1);
  box-shadow:0 0 8px rgba(56,224,176,.85);
}

.nav-quick{display:flex;align-items:center;padding-left:clamp(12px,1.8vw,26px);border-left:1px solid var(--line)}
.quick-link{
  display:inline-flex;
  align-items:center;
  gap:10px;
  padding:9px 15px;
  border:1px solid var(--line-strong);
  border-radius:1px;
  font-size:.86rem;
  color:var(--c-cream);
  transition:border-color .25s ease,background .25s ease,color .25s ease;
}
.quick-link:hover,.quick-link:focus-visible{border-color:var(--c-orange);background:rgba(228,87,46,.12)}
.quick-arrow{font-family:var(--font-mono);color:var(--c-orange);transition:transform .25s ease}
.quick-link:hover .quick-arrow{transform:translateX(4px)}

.scroll-progress{
  position:absolute;
  left:0;
  bottom:0;
  width:100%;
  height:2px;
  transform:scaleX(0);
  transform-origin:left center;
  background:linear-gradient(90deg,var(--c-blue) 0%,var(--c-neon) 68%,var(--c-lemon) 100%);
  opacity:0;
  transition:opacity .3s ease;
}
.site-header.is-solid .scroll-progress{opacity:1}

/* ---------- 11. 页脚 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,112px);
  background:var(--c-ink);
  border-top:1px solid var(--line-strong);
  color:var(--c-cream-dim);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:-1px;
  left:0;
  width:min(280px,42%);
  height:2px;
  background:var(--c-orange);
}
.footer-inner{
  width:100%;
  max-width:var(--shell);
  margin-inline:auto;
  padding:clamp(40px,5vw,72px) var(--gutter) clamp(28px,3vw,44px);
}
.footer-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:var(--sp-3);
  padding-bottom:var(--sp-4);
  border-bottom:1px solid var(--line);
}
.footer-tag{
  font-family:var(--font-mono);
  font-size:.76rem;
  letter-spacing:.2em;
  color:var(--c-cream-faint);
  max-width:none;
}
.to-top{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:9px 16px;
  border:1px solid var(--line-strong);
  border-radius:1px;
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.18em;
  color:var(--c-cream-dim);
  transition:border-color .25s ease,color .25s ease;
}
.to-top:hover{border-color:var(--c-neon);color:var(--c-neon)}

.footer-cols{
  display:grid;
  grid-template-columns:repeat(4,minmax(0,1fr));
  border-bottom:1px solid var(--line);
}
.footer-col{
  padding:var(--sp-4) clamp(14px,2vw,28px);
  border-left:1px solid var(--line);
}
.footer-col:first-child{border-left:0;padding-left:0}
.footer-col:last-child{padding-right:0}
.footer-col-title{
  font-family:var(--font-mono);
  font-size:.7rem;
  font-weight:500;
  letter-spacing:.24em;
  color:var(--c-blue-soft);
  margin-bottom:var(--sp-2);
}
.footer-list{display:flex;flex-direction:column;gap:10px}
.footer-link{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:.9rem;
  color:var(--c-cream-dim);
  transition:color .2s ease;
}
.footer-link::before{
  content:"";
  width:12px;
  height:1px;
  background:var(--line-strong);
  transition:width .22s ease,background .22s ease;
}
.footer-link:hover,.footer-link:focus-visible{color:var(--c-cream)}
.footer-link:hover::before,.footer-link:focus-visible::before{width:20px;background:var(--c-neon)}
.footer-text{
  display:inline-flex;
  align-items:center;
  gap:9px;
  font-size:.88rem;
  color:var(--c-cream-faint);
}
.footer-text::before{
  content:"";
  width:5px;
  height:5px;
  border:1px solid var(--c-moss);
  transform:rotate(45deg);
  flex:0 0 auto;
}

.footer-contact{
  display:grid;
  grid-template-columns:auto 1fr;
  gap:var(--sp-2) var(--sp-4);
  padding-block:var(--sp-4);
  border-bottom:1px solid var(--line);
}
.footer-contact-label{
  font-family:var(--font-mono);
  font-size:.7rem;
  letter-spacing:.24em;
  color:var(--c-clay);
  padding-top:.4em;
}
.footer-contact-line{
  font-size:.92rem;
  color:var(--c-cream);
  word-break:break-word;
  max-width:none;
  line-height:1.9;
}
.footer-contact-line .sep{color:var(--c-blue-soft);padding-inline:.35em}

.footer-legal{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:var(--sp-2);
  padding-top:var(--sp-3);
  font-family:var(--font-mono);
  font-size:.72rem;
  letter-spacing:.12em;
  color:var(--c-cream-faint);
}
.footer-legal-line{display:inline-block}

/* ---------- 12. 动效 ---------- */
[data-reveal]{opacity:1;transform:none}
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .62s ease,transform .62s ease;
}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

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

/* ---------- 13. 响应式 ---------- */
@media (max-width:1100px){
  .grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:980px){
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin-left:0;
    padding-inline:var(--gutter);
    background:rgba(16,20,24,.98);
    border-top:1px solid var(--line);
    border-bottom:1px solid var(--line-strong);
    max-height:0;
    overflow:hidden;
    opacity:0;
    visibility:hidden;
    transition:max-height .38s ease,opacity .3s ease,visibility .3s ease;
  }
  .site-nav[data-open]{
    max-height:min(78vh,560px);
    overflow-y:auto;
    opacity:1;
    visibility:visible;
  }
  .nav-list{
    display:grid;
    grid-template-columns:repeat(2,minmax(0,1fr));
    gap:0;
  }
  .nav-list li{border-bottom:1px solid var(--line)}
  .nav-list li:nth-child(odd){border-right:1px solid var(--line)}
  .nav-link{display:flex;width:100%;padding:16px 14px;font-size:1rem}
  .nav-link::after{bottom:12px;left:14px;right:auto;width:22px}
  .nav-quick{padding:18px 0;border-left:0}
  .quick-link{width:100%;justify-content:space-between;padding:13px 16px}

  .split,.split--reverse{grid-template-columns:1fr;gap:clamp(24px,5vw,40px)}
  .side-note{writing-mode:horizontal-tb;letter-spacing:.22em}

  .footer-cols{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-col{padding:var(--sp-3) 0;border-left:0;border-top:1px solid var(--line)}
  .footer-col:nth-child(-n+2){border-top:0;padding-top:var(--sp-3)}
  .footer-col:nth-child(odd){padding-right:var(--sp-3)}
  .footer-col:first-child{padding-left:0}
  .footer-col:last-child{padding-right:0}
}

@media (max-width:760px){
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .section-head{flex-direction:column;align-items:flex-start}
  .footer-head{flex-direction:column;align-items:flex-start}
  .footer-contact{grid-template-columns:1fr;gap:var(--sp-1)}
  .footer-contact-label{padding-top:0}
}

@media (max-width:620px){
  .footer-cols{grid-template-columns:1fr}
  .footer-col{padding-right:0;border-top:1px solid var(--line)}
  .footer-col:first-child{border-top:0}
  .footer-col:nth-child(odd){padding-right:0}
  .footer-legal{flex-direction:column;align-items:flex-start;gap:6px}
}

@media (max-width:420px){
  .brand-mark{font-size:1.1rem}
  .nav-toggle-label{display:none}
  .btn{width:100%;justify-content:center}
}