/* =====================================================================
   LEYU赛场 · /assets/site.css
   共享外壳：reset / 变量 / 中文排版 / 头部 / 页脚 / 通用组件 / 响应式
   ===================================================================== */

/* ---------- 1. 变量 ---------- */
:root{
  --deep:#0A1B3D;
  --night:#061229;
  --night-2:#040C1C;
  --cyan:#2BE8D5;
  --cyan-soft:#B9FFF6;
  --flame:#FF5A2C;
  --flame-dark:#C63A12;
  --cream:#F4EFE4;
  --brown:#1C1714;
  --slate:#6B7A99;
  --grid:#1E3A66;
  --text:#D7E2F2;
  --text-dim:#9FB0CB;
  --font-sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",Roboto,sans-serif;
  --font-mono:ui-monospace,"SF Mono",Menlo,Consolas,"Liberation Mono",monospace;
  --radius:2px;
  --ease:cubic-bezier(.2,.7,.3,1);
  --shadow-card:0 20px 44px -34px rgba(0,0,0,.95);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;background:var(--night);scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,ul,ol,figure,blockquote,dl,dd{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
table{border-collapse:collapse;width:100%}
::selection{background:var(--cyan);color:#04231F}
:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:1px}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--font-sans);
  font-size:16px;
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--text);
  background-color:var(--night);
  background-image:
    linear-gradient(rgba(30,58,102,.42) 1px,transparent 1px),
    linear-gradient(90deg,rgba(30,58,102,.42) 1px,transparent 1px),
    radial-gradient(900px 520px at 88% -8%,rgba(43,232,213,.12),transparent 62%),
    radial-gradient(700px 460px at 4% 6%,rgba(255,90,44,.09),transparent 60%),
    linear-gradient(180deg,var(--deep) 0%,var(--night) 100%);
  background-size:96px 96px,96px 96px,auto,auto,auto;
  background-attachment:fixed;
}
h1,h2,h3,h4{color:var(--cream);line-height:1.14;font-weight:800;letter-spacing:-.01em}
h1{font-size:clamp(2rem,5vw,3.25rem)}
h2{font-size:clamp(1.5rem,3vw,2rem)}
h3{font-size:1.25rem}
h4{font-size:1.0625rem}
p{max-width:46ch}
a{color:var(--cyan);text-decoration:none;transition:color .16s ease,border-color .16s ease}
a:hover{color:var(--cyan-soft)}
strong,b{color:#F2F7FF;font-weight:700}
hr{border:0;border-top:1px solid var(--grid);margin:32px 0}

.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:.01em}
.kicker{display:inline-block;font-family:var(--font-mono);font-size:11px;letter-spacing:.22em;color:var(--cyan);text-transform:uppercase}
.display{font-size:clamp(2.4rem,6.4vw,4.75rem);font-weight:900;letter-spacing:-.03em;line-height:1.02;color:var(--cream)}
.prose{max-width:38ch}
.prose p{margin:0 0 1.15em}
.prose ul{list-style:none;max-width:38ch}
.prose li{padding-left:18px;position:relative;margin-bottom:.5em}
.prose li::before{content:"";position:absolute;left:0;top:.72em;width:8px;height:1px;background:var(--cyan)}
.statnum{font-family:var(--font-mono);font-size:clamp(2rem,5vw,3.75rem);line-height:1;color:var(--cyan);letter-spacing:-.02em}

/* ---------- 4. 布局容器 ---------- */
.wrap{width:100%;max-width:1240px;margin:0 auto;padding:0 24px}
.wrap--narrow{max-width:820px}
.section{padding:64px 0;border-top:1px solid var(--grid)}
.section--paper{background:var(--cream);color:var(--brown);border-top-color:rgba(28,23,20,.18)}
.section--paper h1,.section--paper h2,.section--paper h3,.section--paper h4{color:var(--brown)}
.section--paper a{color:#A32C0B}
.section--paper a:hover{color:var(--flame)}
.section--paper .section__lead{color:#4A423B}
.section__head{margin-bottom:32px}
.section__num{display:block;font-family:var(--font-mono);font-size:12px;letter-spacing:.2em;color:var(--flame);margin-bottom:10px}
.section__title{margin-bottom:8px}
.section__lead{max-width:38ch;color:var(--text-dim);font-size:15px}

.grid{display:grid;gap:16px}
.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--bento{grid-template-columns:repeat(12,minmax(0,1fr));gap:16px}
.grid--bento > *{grid-column:span 4}
.grid--bento > .cell--wide{grid-column:span 7}
.grid--bento > .cell--hero{grid-column:span 5;grid-row:span 2}
.grid--bento > .cell--tall{grid-row:span 2}

/* ---------- 5. 通用组件 ---------- */
.card{
  position:relative;
  background:linear-gradient(180deg,rgba(16,36,74,.86),rgba(6,18,41,.92));
  border:1px solid var(--grid);
  border-radius:var(--radius);
  padding:20px;
  box-shadow:var(--shadow-card);
}
.card--focus{border-color:rgba(43,232,213,.5);box-shadow:0 0 0 1px rgba(43,232,213,.14),0 24px 50px -34px rgba(43,232,213,.6)}
.paper{
  background:var(--cream);
  color:var(--brown);
  border:1px solid rgba(28,23,20,.16);
  border-radius:var(--radius);
  padding:22px;
  box-shadow:var(--shadow-card);
}
.paper h2,.paper h3,.paper h4{color:var(--brown)}
.paper a{color:#A32C0B}
.paper .num{color:var(--flame-dark)}

.tag{display:inline-flex;align-items:center;gap:6px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;padding:4px 9px;border:1px solid rgba(43,232,213,.4);border-radius:var(--radius);color:var(--cyan);background:rgba(43,232,213,.08)}
.tag--cyan{background:var(--cyan-soft);border-color:var(--cyan-soft);color:#04231F}
.tag--flame{border-color:rgba(255,90,44,.5);color:var(--flame);background:rgba(255,90,44,.1)}
.tag--paper{background:rgba(28,23,20,.06);border-color:rgba(28,23,20,.25);color:var(--brown)}

.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  font-family:var(--font-sans);font-size:13px;font-weight:700;letter-spacing:.02em;
  padding:10px 16px;border:1px solid transparent;border-radius:var(--radius);
  text-decoration:none;cursor:pointer;white-space:nowrap;
  transition:background-color .16s ease,border-color .16s ease,color .16s ease,box-shadow .16s ease;
}
.btn--primary{background:var(--cyan);color:#04231F;border-color:var(--cyan)}
.btn--primary:hover{background:#7FF3E8;border-color:#7FF3E8;color:#04231F}
.btn--quota{background:var(--flame);color:#1A0703;border-color:var(--flame)}
.btn--quota:hover{background:var(--flame-dark);border-color:var(--flame-dark);color:#FFF4F0}
.btn--ghost{background:rgba(43,232,213,.06);color:var(--cyan);border-color:rgba(43,232,213,.42)}
.btn--ghost:hover{background:rgba(43,232,213,.16);border-color:var(--cyan);color:var(--cyan-soft)}
.btn--line{background:transparent;color:var(--cream);border-color:rgba(244,239,228,.4)}
.btn--line:hover{border-color:var(--cream);color:#fff}
.btn--sm{padding:7px 12px;font-size:12px}
.link-more{display:inline-flex;align-items:center;gap:8px;font-size:13px;font-weight:700;color:var(--cyan);border-bottom:1px solid rgba(43,232,213,.45);padding-bottom:2px}
.link-more::after{content:"→";font-family:var(--font-mono)}
.link-more:hover{color:var(--cyan-soft);border-bottom-color:var(--cyan-soft)}

/* 图片位：页面阶段把 <img> 放进 .media 即可 */
.media{
  position:relative;overflow:hidden;border:1px solid var(--grid);border-radius:var(--radius);
  aspect-ratio:16/9;
  background-color:rgba(6,18,41,.75);
  background-image:
    repeating-linear-gradient(90deg,rgba(30,58,102,.75) 0 1px,transparent 1px 26px),
    repeating-linear-gradient(0deg,rgba(30,58,102,.75) 0 1px,transparent 1px 26px),
    radial-gradient(120% 90% at 78% 12%,rgba(43,232,213,.18),transparent 58%),
    linear-gradient(180deg,rgba(10,27,61,.9),rgba(4,12,28,.95));
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:3/4}
.media--square{aspect-ratio:1/1}
.media img{width:100%;height:100%;object-fit:cover}
.media__cap{
  position:absolute;left:0;bottom:0;z-index:2;
  font-family:var(--font-mono);font-size:12px;letter-spacing:.04em;
  color:var(--cyan-soft);background:rgba(6,18,41,.88);
  padding:6px 10px;border-top:1px solid var(--grid);border-right:1px solid var(--grid);
}

/* 刻度条 */
.tickbar{position:relative;height:16px;margin-top:18px;overflow:hidden}
.tickbar::before{content:"";position:absolute;left:0;right:0;bottom:0;height:8px;
  background-image:repeating-linear-gradient(90deg,var(--grid) 0 1px,transparent 1px 14px)}
.tickbar__line{position:absolute;left:0;bottom:7px;width:44%;height:2px;background:var(--cyan)}

/* 面包屑 */
.crumbs{display:flex;flex-wrap:wrap;gap:8px;padding:20px 0 0;font-family:var(--font-mono);font-size:12px;color:var(--slate)}
.crumbs__item{display:flex;align-items:center;gap:8px}
.crumbs__link{color:var(--text-dim);border-bottom:1px solid transparent}
.crumbs__link:hover{color:var(--cyan);border-bottom-color:var(--cyan)}
.crumbs__sep{color:var(--grid)}
.crumbs__current{color:var(--cyan-soft)}

/* ---------- 6. 跳过链接 ---------- */
.skip-link{
  position:absolute;left:16px;top:-72px;z-index:200;
  background:var(--cyan);color:#04231F;font-size:13px;font-weight:700;
  padding:10px 16px;border-radius:var(--radius);text-decoration:none;
  transition:top .18s ease;
}
.skip-link:focus{top:12px;color:#04231F}

/* ---------- 7. 头部 ---------- */
.site-header{position:sticky;top:0;z-index:60;background:transparent}

.progressbar{position:absolute;left:0;right:0;bottom:-1px;height:2px;z-index:3;pointer-events:none;background:rgba(30,58,102,.6)}
.progressbar__fill{display:block;height:100%;width:100%;transform:scaleX(0);transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan),var(--cyan-soft))}

/* 顶部细数据条 */
.datastrip{height:36px;overflow:hidden;background:rgba(6,18,41,.96);border-bottom:1px solid var(--grid);
  backdrop-filter:blur(8px);transition:height .22s var(--ease),background-color .22s ease}
.datastrip__inner{
  max-width:1240px;margin:0 auto;padding:0 24px;height:36px;
  display:flex;align-items:center;gap:24px;font-size:12px;
  transition:opacity .16s ease;
}
.datastrip__item{display:flex;align-items:baseline;gap:7px}
.datastrip__label{font-size:11px;letter-spacing:.1em;color:var(--slate)}
.datastrip__value{font-size:12px;color:var(--cyan-soft)}
.datastrip__item--quota .datastrip__value{color:var(--flame)}
.datastrip__link{
  margin-left:auto;font-size:11px;letter-spacing:.08em;color:var(--cyan);
  padding:3px 10px;border:1px solid rgba(43,232,213,.38);border-radius:var(--radius);
}
.datastrip__link:hover{background:rgba(43,232,213,.14);border-color:var(--cyan)}
.site-header[data-collapsed] .datastrip{
  height:2px;border-bottom-color:transparent;
  background:linear-gradient(90deg,var(--cyan),rgba(43,232,213,.15));
}
.site-header[data-collapsed] .datastrip__inner{opacity:0;visibility:hidden}

/* 居中刊头 */
.masthead{
  background:linear-gradient(180deg,rgba(10,27,61,.94),rgba(10,27,61,.66));
  border-bottom:1px solid var(--grid);
  backdrop-filter:blur(10px);
}
.masthead__inner{
  max-width:1240px;margin:0 auto;padding:18px 24px 14px;
  display:grid;grid-template-columns:1fr auto 1fr;align-items:center;gap:20px;
}
.masthead__meta{grid-column:1;display:flex;flex-direction:column;gap:3px;max-width:none}
.masthead__metakey{font-family:var(--font-mono);font-size:11px;letter-spacing:.18em;color:var(--slate)}
.masthead__metaval{font-size:15px;color:var(--cyan-soft)}
.masthead__brand{grid-column:2;text-align:center}
.masthead__tools{grid-column:3;display:flex;align-items:center;justify-content:flex-end;gap:10px}

.brand{display:inline-flex;align-items:baseline;gap:6px;color:var(--cream);text-decoration:none}
.brand__mark{font-family:var(--font-mono);font-weight:700;font-size:clamp(1.05rem,2.2vw,1.4rem);letter-spacing:.02em;color:var(--cream)}
.brand__cn{font-size:clamp(1.4rem,3.4vw,2.15rem);font-weight:900;letter-spacing:.08em;color:#F4EFE4;transition:color .16s ease}
.brand:hover .brand__cn{color:var(--cyan)}
.brand__sub{margin-top:5px;font-family:var(--font-mono);font-size:11px;letter-spacing:.32em;color:var(--slate)}

/* 移动导航按钮 */
.navtoggle{
  display:none;align-items:center;gap:9px;
  padding:9px 12px;border:1px solid rgba(43,232,213,.42);border-radius:var(--radius);
  color:var(--cyan);font-size:13px;font-weight:700;letter-spacing:.08em;
}
.navtoggle__bars{display:flex;flex-direction:column;gap:4px}
.navtoggle__bar{display:block;width:16px;height:2px;background:currentColor}
.navtoggle[aria-expanded="true"]{background:rgba(43,232,213,.16);color:var(--cyan-soft)}

/* 居中栏目索引 */
.mainnav{
  position:relative;z-index:2;
  background:rgba(6,18,41,.72);
  border-bottom:1px solid var(--grid);
  backdrop-filter:blur(6px);
}
.mainnav__title{display:none;font-family:var(--font-mono);font-size:11px;letter-spacing:.24em;color:var(--slate)}
.mainnav__list{
  position:relative;max-width:1240px;margin:0 auto;padding:0 24px;
  display:flex;justify-content:center;flex-wrap:wrap;
}
.mainnav__item{position:relative}
.mainnav__link{
  position:relative;display:flex;align-items:baseline;gap:8px;
  padding:15px 16px 13px;
  font-size:15px;font-weight:600;letter-spacing:.02em;color:#C4D3EA;
  border-bottom:2px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.mainnav__link:hover,.mainnav__link:focus-visible{color:var(--cyan-soft);border-bottom-color:var(--cyan)}
.mainnav__link[aria-current="page"]{color:var(--cyan);border-bottom-color:var(--flame)}
.mainnav__num{font-family:var(--font-mono);font-size:11px;letter-spacing:.06em;color:var(--slate)}
.mainnav__link:hover .mainnav__num{color:var(--cyan)}
.mainnav__link[aria-current="page"] .mainnav__num{color:var(--flame)}
.mainnav__hint{
  position:absolute;left:50%;top:calc(100% + 1px);z-index:6;
  transform:translate(-50%,8px);
  padding:7px 12px;white-space:nowrap;
  background:var(--cream);color:var(--brown);
  font-family:var(--font-sans);font-size:12px;font-weight:600;letter-spacing:.02em;
  border-radius:var(--radius);box-shadow:0 16px 30px -18px rgba(0,0,0,.95);
  opacity:0;visibility:hidden;pointer-events:none;
  transition:opacity .16s ease,transform .16s ease;
}
.mainnav__link:hover .mainnav__hint,
.mainnav__link:focus-visible .mainnav__hint{opacity:1;visibility:visible;transform:translate(-50%,0)}

/* ---------- 8. 页脚 ---------- */
.site-footer{
  position:relative;z-index:1;
  background:linear-gradient(180deg,var(--night),var(--night-2));
  border-top:1px solid var(--grid);
  color:var(--text-dim);
}
.footer__top{
  max-width:1240px;margin:0 auto;padding:56px 24px 40px;
  display:grid;grid-template-columns:1.5fr 1fr 1fr 1fr;gap:40px 32px;
  border-bottom:1px solid var(--grid);
}
.footer__brand{display:flex;flex-direction:column;align-items:flex-start}
.brand--footer .brand__cn{font-size:1.5rem}
.brand--footer .brand__mark{font-size:1.05rem}
.footer__tagline{margin-top:14px;font-size:13px;line-height:1.7;color:#8EA1C0;max-width:26ch}
.footer__col{min-width:0}
.footer__coltitle{
  margin-bottom:14px;font-family:var(--font-mono);font-size:12px;
  font-weight:700;letter-spacing:.18em;color:var(--cyan);
}
.footer__list{display:flex;flex-direction:column;gap:10px}
.footer__link{
  display:inline-flex;align-items:center;gap:8px;
  font-size:14px;color:#C4D3EA;border-bottom:1px solid transparent;
  transition:color .16s ease,border-color .16s ease;
}
.footer__link::before{content:"";width:10px;height:1px;background:var(--grid);transition:width .16s ease,background-color .16s ease}
.footer__link:hover{color:var(--cyan-soft);border-bottom-color:var(--cyan)}
.footer__link:hover::before{width:16px;background:var(--flame)}

.footer__contact{
  max-width:1240px;margin:0 auto;padding:32px 24px 0;
  display:grid;grid-template-columns:minmax(0,.7fr) minmax(0,1.6fr);gap:20px 32px;align-items:start;
}
.footer__contacttitle{font-family:var(--font-mono);font-size:12px;font-weight:700;letter-spacing:.18em;color:var(--cyan)}
.footer__contactlist{display:flex;flex-wrap:wrap;gap:16px 40px}
.footer__contactitem{display:flex;flex-direction:column;gap:4px;min-width:0}
.footer__contactkey{font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;color:var(--slate)}
.footer__contactval{font-size:14px;color:#E4EDFA;word-break:break-all}
.footer__note{grid-column:1 / -1;max-width:62ch;font-size:12.5px;line-height:1.75;color:#8397B5}

.footer__bottom{
  max-width:1240px;margin:36px auto 0;padding:20px 24px 40px;
  border-top:1px solid var(--grid);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;gap:12px;
}
.footer__legal{display:flex;flex-wrap:wrap;align-items:center;gap:10px;font-size:12px;color:#7D90AE}
.footer__dot{color:var(--grid)}
.footer__closing{font-size:13px;letter-spacing:.16em;color:var(--cyan-soft)}

/* ---------- 9. 进入动效 ---------- */
html[data-motion="ready"] [data-reveal]{
  opacity:0;transform:translate3d(-12px,10px,0);
  transition:opacity .5s ease,transform .5s var(--ease);
}
html[data-motion="ready"] [data-reveal].is-in{opacity:1;transform:none}

/* ---------- 10. 响应式 ---------- */
@media (max-width:1100px){
  .footer__top{grid-template-columns:1fr 1fr 1fr;gap:36px 28px}
  .footer__brand{grid-column:1 / -1}
}
@media (max-width:960px){
  .grid--bento > *{grid-column:span 6}
  .grid--bento > .cell--wide,
  .grid--bento > .cell--hero{grid-column:span 12;grid-row:auto}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
}
@media (max-width:900px){
  .datastrip__inner{gap:16px;padding:0 16px}
  .masthead__inner{
    grid-template-columns:1fr auto;gap:10px 14px;
    padding:14px 16px 12px;align-items:center;
  }
  .masthead__brand{grid-column:1;grid-row:1;text-align:left}
  .masthead__tools{grid-column:2;grid-row:1}
  .masthead__meta{grid-column:1 / -1;grid-row:2;flex-direction:row;align-items:baseline;gap:8px}
  .masthead__tools .btn--ghost{display:none}
  .brand__sub{letter-spacing:.22em}

  .navtoggle{display:inline-flex}

  .mainnav{
    position:fixed;top:0;right:0;bottom:0;
    width:min(330px,88vw);
    padding:88px 0 32px;
    background:linear-gradient(180deg,var(--deep),var(--night) 72%);
    border-bottom:0;border-left:1px solid var(--grid);
    transform:translateX(101%);visibility:hidden;overflow-y:auto;z-index:90;
    transition:transform .28s var(--ease),visibility .28s linear;
  }
  .mainnav[data-open]{transform:translateX(0);visibility:visible}
  .mainnav__title{display:block;padding:0 24px 16px}
  .mainnav__list{flex-direction:column;flex-wrap:nowrap;padding:0 24px}
  .mainnav__item{border-bottom:1px dashed rgba(43,232,213,.22)}
  .mainnav__link{padding:16px 4px;font-size:17px;border-bottom:0}
  .mainnav__link[aria-current="page"]{border-bottom:0;color:var(--cyan)}
  .mainnav__hint{display:none}
  .footer__contact{grid-template-columns:1fr}
  .footer__contactlist{gap:16px 28px}
}
@media (max-width:640px){
  .wrap{padding:0 18px}
  .datastrip__item:nth-child(2){display:none}
  .section{padding:48px 0}
  .grid--2,.grid--3,.grid--4{grid-template-columns:1fr}
  .grid--bento > *,
  .grid--bento > .cell--wide,
  .grid--bento > .cell--hero{grid-column:span 12}
  .footer__top{grid-template-columns:1fr 1fr;padding:44px 18px 32px;gap:32px 20px}
  .footer__contact{padding:28px 18px 0}
  .footer__bottom{padding:18px 18px 32px;flex-direction:column;align-items:flex-start}
  .footer__closing{letter-spacing:.12em}
}

/* ---------- 11. 降低动效 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.001ms !important;
    scroll-behavior:auto !important;
  }
  html[data-motion] [data-reveal]{opacity:1;transform:none}
}