/* ============================================================
   星空体育 · 共享样式 /assets/site.css
   深空蓝 × 星云紫 × 暖纸：Bento 手册式版面基础层
   ============================================================ */

/* ---------- 1. 重置 ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth}
body,h1,h2,h3,h4,h5,p,figure,blockquote,dl,dd{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg,video{display:block;max-width:100%;height:auto}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
table{border-collapse:collapse}
[id]{scroll-margin-top:132px}

/* ---------- 2. 设计令牌 ---------- */
:root{
  --ink-deep:#0A1330;
  --ink-module:#16224D;
  --nebula:#6D3FC4;
  --nebula-soft:#A98BF5;
  --flame:#FF7A29;
  --volt:#2AD4E0;
  --paper:#F3EDE0;
  --ink:#14181F;
  --frost:#E8EEF9;
  --river:#3E7BB6;
  --muted:#8A93AD;

  --line:rgba(169,139,245,.26);
  --line-soft:rgba(232,238,249,.10);
  --line-paper:rgba(20,24,31,.16);

  --font-sans:"Noto Sans SC","Source Han Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Helvetica Neue",sans-serif;
  --font-serif:"Source Han Serif SC","Noto Serif SC","Songti SC",Georgia,serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --wrap:1240px;
  --gap:24px;
  --radius:16px;
  --radius-sm:9px;
  --ease:cubic-bezier(.22,.61,.36,1);
  --shadow-card:0 18px 44px rgba(4,8,22,.48);
}

/* ---------- 3. 基础排版 ---------- */
body{
  min-height:100%;
  background-color:var(--ink-deep);
  background-image:
    radial-gradient(1200px 720px at 10% -10%, rgba(109,63,196,.30), transparent 62%),
    radial-gradient(900px 620px at 94% 4%, rgba(42,212,224,.12), transparent 60%),
    radial-gradient(1100px 720px at 58% 112%, rgba(62,123,182,.20), transparent 66%);
  color:var(--frost);
  font:400 16px/1.75 var(--font-sans);
  letter-spacing:.005em;
  overflow-x:clip;
}
:where(h1,h2,h3,h4){font-family:var(--font-sans);font-weight:800;line-height:1.2;letter-spacing:-.02em;color:var(--frost)}
h1{font-size:clamp(2.4rem,6.5vw,5.6rem);line-height:1.06;font-weight:900}
h2{font-size:clamp(1.6rem,3vw,2.6rem)}
h3{font-size:clamp(1.15rem,1.6vw,1.5rem)}
p{text-wrap:pretty}
strong{color:var(--flame);font-weight:700}
::selection{background:var(--flame);color:#1A1008}
:focus-visible{outline:2px solid var(--volt);outline-offset:3px;border-radius:3px}

.wrap{width:100%;max-width:var(--wrap);margin-inline:auto;padding-inline:clamp(16px,4vw,40px)}
.mono,.num-block__value,.archive-progress__value,.footer-archive,.contact-row__value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  letter-spacing:.02em;
}
.eyebrow{font-family:var(--font-mono);font-size:12px;letter-spacing:.18em;color:var(--muted);text-transform:uppercase}
.label-tag{
  display:inline-flex;align-items:center;gap:8px;
  padding:5px 13px;border:1px solid var(--line);border-radius:999px;
  background:rgba(109,63,196,.14);color:var(--nebula-soft);
  font-size:12px;letter-spacing:.14em;line-height:1.5;
}
.label-tag--paper{border-color:var(--line-paper);background:rgba(20,24,31,.06);color:#5A4630}
.label-tag--flame{border-color:rgba(255,122,41,.45);background:rgba(255,122,41,.14);color:var(--flame)}

/* ---------- 4. 跳过链接 ---------- */
.skip-link{
  position:fixed;top:10px;left:10px;z-index:300;
  padding:11px 18px;border-radius:999px;
  background:var(--volt);color:#05242A;font-weight:700;font-size:14px;
  transform:translateY(-180%);
  transition:transform .24s var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 5. 页头 ---------- */
.site-header{
  position:sticky;top:0;z-index:90;
  background:linear-gradient(180deg,#0A1330 0%,#0B1739 100%);
  border-bottom:1px solid var(--line);
  color:var(--frost);
}
.site-header::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(60% 130% at 6% -30%, rgba(109,63,196,.38), transparent 62%),
    radial-gradient(46% 120% at 96% 130%, rgba(42,212,224,.14), transparent 62%);
}
.site-header > *{position:relative;z-index:1}

.header-top{border-bottom:1px solid var(--line-soft)}
.header-top__inner{
  display:flex;align-items:center;gap:clamp(14px,3vw,34px);
  padding-block:14px;min-height:66px;
  transition:min-height .32s var(--ease),padding .32s var(--ease);
}
.header-top__actions{margin-left:auto;display:flex;align-items:center;gap:10px;flex:none}
.site-header.is-condensed .header-top__inner{padding-block:4px;min-height:44px;gap:16px}
.site-header.is-condensed .archive-progress,
.site-header.is-condensed .brand__line{display:none}

.brand{display:inline-flex;align-items:center;gap:12px;flex:none;min-width:0}
.brand__mark{
  position:relative;flex:none;width:34px;height:34px;border-radius:11px;
  background:conic-gradient(from 200deg,var(--nebula),var(--volt) 45%,var(--flame) 72%,var(--nebula));
  box-shadow:0 8px 20px rgba(109,63,196,.45);
}
.brand__mark::before{content:"";position:absolute;inset:3px;border-radius:8px;background:var(--ink-deep)}
.brand__mark::after{
  content:"";position:absolute;inset:11px;border-radius:50%;
  background:radial-gradient(circle at 34% 28%,var(--frost),var(--nebula-soft) 58%,var(--volt));
}
.brand__text{display:flex;flex-direction:column;line-height:1.18;min-width:0}
.brand__name{font-size:17px;font-weight:800;letter-spacing:.05em;color:var(--frost)}
.brand__line{
  font-size:11.5px;letter-spacing:.12em;color:var(--muted);
  white-space:nowrap;overflow:hidden;text-overflow:ellipsis;
}
.brand:hover .brand__name{color:var(--volt)}

.archive-progress{display:flex;align-items:center;gap:10px;flex:1 1 auto;min-width:0;max-width:420px}
.archive-progress__label{font-size:11px;letter-spacing:.14em;color:var(--muted);white-space:nowrap}
.archive-progress__track{position:relative;flex:1 1 auto;min-width:56px;height:4px;border-radius:999px;background:rgba(232,238,249,.14);overflow:hidden}
.archive-progress__fill{position:absolute;left:0;top:0;bottom:0;width:100%;border-radius:999px;background:linear-gradient(90deg,var(--nebula),var(--volt))}
.archive-progress__fill::after{
  content:"";position:absolute;right:-3px;top:50%;width:7px;height:7px;border-radius:50%;
  background:var(--flame);transform:translateY(-50%);box-shadow:0 0 10px var(--flame);
}
.archive-progress__value{font-size:12px;color:rgba(232,238,249,.72);white-space:nowrap}

.header-nav{position:relative;background:rgba(10,19,48,.72);backdrop-filter:blur(6px)}
.header-nav__inner{display:flex;align-items:center;gap:18px;padding-block:4px}

.site-nav{flex:1 1 auto;min-width:0;overflow-x:auto;overscroll-behavior-x:contain;scrollbar-width:none}
.site-nav::-webkit-scrollbar{display:none}
.site-nav__list{display:flex;align-items:stretch;gap:clamp(6px,1.6vw,26px)}
.site-nav__item{flex:none}
.site-nav__link{
  position:relative;display:inline-flex;align-items:center;
  padding:15px 4px;font-size:15px;letter-spacing:.04em;
  color:rgba(232,238,249,.76);white-space:nowrap;
  transition:color .2s var(--ease);
}
.site-nav__link::after{
  content:"";position:absolute;left:50%;bottom:9px;width:0;height:3px;
  border-radius:0 0 50% 50% / 0 0 4px 4px;
  background:var(--volt);transform:translateX(-50%);
  transition:width .28s var(--ease),background .2s var(--ease);
}
.site-nav__link:hover{color:var(--frost)}
.site-nav__link:hover::after{width:56%;background:var(--nebula-soft)}
.site-nav__link[aria-current="page"]{color:var(--frost)}
.site-nav__link[aria-current="page"]::after{
  width:100%;background:var(--volt);box-shadow:0 0 12px rgba(42,212,224,.6);
}

.header-nav__utility{
  display:flex;align-items:center;gap:14px;flex:none;
  padding-left:16px;border-left:1px solid var(--line-soft);
}
.util-link{display:inline-flex;align-items:center;gap:7px;font-size:13px;letter-spacing:.06em;color:rgba(232,238,249,.76)}
.util-link:hover{color:var(--volt)}
.util-link__dot{width:6px;height:6px;border-radius:50%;background:var(--volt);box-shadow:0 0 8px var(--volt)}
.util-lang{font-size:12px;letter-spacing:.1em;color:var(--muted)}

.nav-toggle{
  display:none;align-items:center;gap:9px;
  padding:9px 14px;border:1px solid var(--line);border-radius:999px;
  font-size:14px;letter-spacing:.04em;color:var(--frost);
}
.nav-toggle:hover{border-color:var(--volt);color:var(--volt)}
.nav-toggle__bars{position:relative;width:16px;height:10px;flex:none}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";position:absolute;left:0;right:0;height:1.5px;border-radius:2px;
  background:currentColor;transition:transform .28s var(--ease),top .28s var(--ease),bottom .28s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{top:4px;transform:rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{bottom:4px;transform:rotate(-45deg)}

/* ---------- 6. 页脚 ---------- */
.site-footer{
  position:relative;margin-top:clamp(60px,9vw,140px);overflow:hidden;
  background:
    radial-gradient(120% 90% at 50% -25%, rgba(109,63,196,.34), transparent 62%),
    linear-gradient(180deg,#14181F 0%,#0A0D14 72%);
  border-top:1px solid var(--line);
  color:rgba(232,238,249,.82);
}
.site-footer::before{
  content:"";position:absolute;inset:0;pointer-events:none;opacity:.1;
  background-image:
    repeating-linear-gradient(60deg,rgba(232,238,249,.6) 0 1px,transparent 1px 9px),
    repeating-linear-gradient(-60deg,rgba(42,212,224,.4) 0 1px,transparent 1px 13px);
  -webkit-mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 72%);
  mask-image:linear-gradient(180deg,rgba(0,0,0,.85),transparent 72%);
}
.site-footer::after{
  content:"";position:absolute;left:-10%;right:-10%;top:-42px;height:86px;pointer-events:none;
  border-top:1px solid rgba(169,139,245,.34);border-radius:50% 50% 0 0 / 100% 100% 0 0;
}
.site-footer > *{position:relative;z-index:1}

.footer-grid{
  display:grid;grid-template-columns:1.5fr .9fr .9fr 1.3fr;
  gap:clamp(22px,3vw,48px);
  padding-block:clamp(40px,6vw,76px) clamp(24px,4vw,44px);
}
.footer-col{min-width:0}
.footer-col__title{
  display:flex;align-items:center;gap:9px;
  font-family:var(--font-mono);font-size:12px;font-weight:600;
  letter-spacing:.16em;color:var(--nebula-soft);margin-bottom:16px;
}
.footer-col__title::before{content:"";width:12px;height:2px;border-radius:2px;background:var(--flame)}
.footer-list li + li{margin-top:10px}
.footer-list a{font-size:15px;color:rgba(232,238,249,.78);transition:color .2s var(--ease)}
.footer-list a:hover{color:var(--volt)}
.brand--footer{margin-bottom:16px}
.footer-archive{font-size:12.5px;color:rgba(232,238,249,.68);letter-spacing:.04em}
.footer-icp{margin-top:8px;font-size:12.5px;color:var(--muted)}

.footer-list--contact li + li{margin-top:14px}
.contact-row{display:flex;flex-wrap:wrap;align-items:center;gap:10px}
.contact-row__value{font-size:13px;color:rgba(232,238,249,.86);word-break:break-all}
.copy-btn{
  flex:none;padding:5px 12px;border:1px solid var(--line);border-radius:999px;
  font-size:12px;letter-spacing:.1em;color:var(--nebula-soft);
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.copy-btn:hover{border-color:var(--volt);color:var(--volt)}
.copy-btn.is-copied{border-color:var(--flame);background:rgba(255,122,41,.16);color:var(--flame)}
.copy-btn__text{pointer-events:none}

.footer-bottom{border-top:1px solid rgba(232,238,249,.09);background:rgba(6,9,16,.55)}
.footer-bottom__inner{
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:12px 24px;padding-block:20px;
}
.footer-bottom__copy{font-size:12.5px;color:var(--muted);font-family:var(--font-mono);letter-spacing:.03em}
.footer-legal{display:flex;flex-wrap:wrap;gap:8px 20px;font-size:12.5px}
.footer-legal a{color:rgba(232,238,249,.72)}
.footer-legal a:hover{color:var(--volt)}

/* ---------- 7. 通用按钮 ---------- */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;border:1px solid transparent;border-radius:999px;
  font-size:15px;font-weight:600;letter-spacing:.02em;text-align:center;
  transition:transform .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn:hover{transform:translateY(-2px)}
.btn--primary{background:var(--flame);color:#221305;border-color:rgba(255,122,41,.55);box-shadow:0 10px 26px rgba(255,122,41,.28)}
.btn--primary:hover{box-shadow:0 14px 32px rgba(255,122,41,.38)}
.btn--ghost{background:transparent;border-color:var(--line);color:var(--frost)}
.btn--ghost:hover{border-color:var(--nebula-soft);color:var(--nebula-soft)}
.btn--volt{background:transparent;border-color:rgba(42,212,224,.55);color:var(--volt)}
.btn--volt:hover{background:rgba(42,212,224,.12)}
.btn--sm{padding:8px 16px;font-size:13.5px}
.btn--block{width:100%}

/* ---------- 8. 版面容器与 Bento ---------- */
.section{position:relative;padding-block:clamp(48px,8vw,112px)}
.section__head{display:flex;flex-wrap:wrap;align-items:flex-end;gap:14px 26px;margin-bottom:clamp(24px,4vw,46px)}
.section__title{flex:1 1 320px}
.section__desc{flex:1 1 300px;max-width:54ch;font-size:16px;color:rgba(232,238,249,.72)}

.bento{display:grid;grid-template-columns:repeat(12,minmax(0,1fr));gap:var(--gap)}
.bento > *{min-width:0}
.b-1{grid-column:span 1}.b-2{grid-column:span 2}.b-3{grid-column:span 3}.b-4{grid-column:span 4}
.b-5{grid-column:span 5}.b-6{grid-column:span 6}.b-7{grid-column:span 7}.b-8{grid-column:span 8}
.b-9{grid-column:span 9}.b-10{grid-column:span 10}.b-11{grid-column:span 11}.b-12{grid-column:span 12}

.ink-card{
  position:relative;border:1px solid var(--line);border-radius:var(--radius);
  background:linear-gradient(180deg,rgba(22,34,77,.96),rgba(10,19,48,.96));
  padding:clamp(18px,2.4vw,30px);
  transition:transform .24s var(--ease),border-color .24s var(--ease),box-shadow .24s var(--ease);
}
.ink-card:hover{transform:translateY(-4px);border-color:var(--nebula-soft);box-shadow:var(--shadow-card)}
.ink-card__meta{font-family:var(--font-mono);font-size:12px;letter-spacing:.1em;color:var(--muted)}

.paper-card{
  position:relative;border:1px solid var(--line-paper);border-radius:var(--radius);
  background:var(--paper);color:var(--ink);box-shadow:var(--shadow-card);
  padding:clamp(20px,3vw,34px);
}
.paper-card :where(h1,h2,h3,h4){color:var(--ink)}
.paper-card p,.paper-card li{color:rgba(20,24,31,.8)}
.paper-card__label{
  position:absolute;top:-13px;left:20px;
  padding:4px 12px;border-radius:999px;background:var(--ink);color:var(--frost);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.14em;
}

.num-block{margin-block:6px 10px}
.num-block__value{display:block;font-size:clamp(2.6rem,6vw,5.2rem);line-height:1;font-weight:700;color:var(--flame)}
.num-block__unit{display:block;margin-top:8px;font-size:13px;letter-spacing:.1em;color:var(--muted)}

.orbit-divider{position:relative;height:64px;margin-block:clamp(18px,3vw,38px);overflow:hidden}
.orbit-divider::before{
  content:"";position:absolute;left:-6%;right:-6%;top:50%;height:150%;
  border-top:1px solid var(--line);border-radius:50% 50% 0 0 / 100% 100% 0 0;
  transform:translateY(-50%);
}
.slant-top{clip-path:polygon(0 3%,100% 0,100% 100%,0 100%)}
.slant-bottom{clip-path:polygon(0 0,100% 0,100% 97%,0 100%)}

/* ---------- 9. 媒体容器 ---------- */
.image-frame{
  position:relative;overflow:hidden;border-radius:var(--radius);
  aspect-ratio:16/9;isolation:isolate;
  border:1px solid var(--line);
  background:linear-gradient(140deg,var(--ink-module),var(--ink-deep) 62%);
}
.image-frame > img,.image-frame > picture > img{width:100%;height:100%;object-fit:cover}
.image-frame::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background:
    radial-gradient(80% 60% at 12% 8%, rgba(109,63,196,.42), transparent 62%),
    radial-gradient(70% 60% at 88% 92%, rgba(42,212,224,.18), transparent 64%);
  mix-blend-mode:screen;
}
.image-frame--wide{aspect-ratio:21/9}
.image-frame--square{aspect-ratio:1/1}
.image-frame--portrait{aspect-ratio:3/4}
.image-frame--focus{aspect-ratio:4/3}
.image-frame__tag{
  position:absolute;left:14px;top:14px;z-index:2;
  padding:4px 11px;border-radius:999px;border:1px solid var(--line);
  background:rgba(10,19,48,.72);color:var(--frost);
  font-family:var(--font-mono);font-size:11px;letter-spacing:.12em;
}
.image-frame__caption{
  position:absolute;left:14px;right:14px;bottom:12px;z-index:2;
  font-size:12.5px;color:rgba(232,238,249,.82);text-shadow:0 1px 6px rgba(4,8,22,.8);
}

/* ---------- 10. 数据与交互组件 ---------- */
.data-table{width:100%;font-size:15px}
.data-table caption{caption-side:top;text-align:left;font-family:var(--font-mono);font-size:12px;letter-spacing:.12em;color:var(--muted);padding-bottom:10px}
.data-table th{
  font-family:var(--font-mono);font-size:12px;font-weight:600;letter-spacing:.12em;
  text-align:left;color:var(--nebula-soft);padding:10px 12px;border-bottom:1px solid var(--line);
}
.data-table td{padding:12px;border-bottom:1px solid var(--line-soft);vertical-align:top;color:rgba(232,238,249,.86)}
.data-table tbody tr:nth-child(even){background:rgba(22,34,77,.55)}
.paper-card .data-table th{color:#5B3AA8;border-color:var(--line-paper)}
.paper-card .data-table td{color:rgba(20,24,31,.82);border-color:rgba(20,24,31,.1)}
.paper-card .data-table tbody tr:nth-child(even){background:rgba(20,24,31,.05)}

.chip{
  display:inline-flex;align-items:center;gap:6px;
  padding:7px 14px;border:1px solid var(--line);border-radius:999px;
  background:rgba(22,34,77,.6);color:rgba(232,238,249,.82);
  font-size:13px;letter-spacing:.03em;
  transition:border-color .2s var(--ease),color .2s var(--ease),background .2s var(--ease);
}
.chip:hover{border-color:var(--nebula-soft);color:var(--frost)}
.chip[aria-pressed="true"],.chip.is-active{background:var(--volt);border-color:var(--volt);color:#05242A;font-weight:600}

.disclosure{
  border:1px solid var(--line);border-radius:var(--radius);
  background:rgba(22,34,77,.62);overflow:hidden;
}
.disclosure + .disclosure{margin-top:12px}
.disclosure__trigger{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  width:100%;padding:18px 20px;text-align:left;font-size:16px;font-weight:600;color:var(--frost);
}
.disclosure__icon{
  flex:none;width:22px;height:22px;border-radius:50%;border:1px solid var(--line);
  display:grid;place-items:center;font-family:var(--font-mono);font-size:14px;color:var(--nebula-soft);
}
.disclosure[data-open="true"] .disclosure__icon{background:var(--volt);border-color:var(--volt);color:#05242A}
.disclosure[data-open="false"] .disclosure__panel{display:none}
.disclosure__panel{padding:0 20px 20px;color:rgba(232,238,249,.78)}

.prose{max-width:68ch;font-family:var(--font-serif);font-size:17px;line-height:1.92}
.prose p + p,.prose ul + p,.prose p + ul{margin-top:1em}
.prose :where(h2,h3){font-family:var(--font-sans);margin-top:1.5em;margin-bottom:.5em}
.prose ul{list-style:disc;padding-left:1.4em}
.prose li{margin-top:.4em}
.paper-card .prose{color:var(--ink)}

.breadcrumbs{
  display:flex;flex-wrap:wrap;align-items:center;gap:6px;
  font-family:var(--font-mono);font-size:13px;letter-spacing:.06em;color:var(--muted);
}
.breadcrumbs li{display:flex;align-items:center;gap:6px}
.breadcrumbs li + li::before{content:"/";color:rgba(138,147,173,.6)}
.breadcrumbs a:hover{color:var(--volt)}

/* ---------- 11. 滚动显现与返回顶部 ---------- */
.has-js [data-reveal]{
  opacity:0;transform:translateY(16px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
}
.has-js [data-reveal].is-visible{opacity:1;transform:none}

.to-top{
  position:fixed;right:clamp(14px,3vw,34px);bottom:clamp(14px,3vw,34px);z-index:80;
  width:46px;height:46px;border-radius:50%;
  display:grid;place-items:center;font-size:17px;
  background:rgba(22,34,77,.94);border:1px solid var(--line);color:var(--frost);
  box-shadow:var(--shadow-card);
  opacity:0;visibility:hidden;transform:translateY(8px);
  transition:opacity .24s var(--ease),transform .24s var(--ease),visibility .24s var(--ease),border-color .2s var(--ease),color .2s var(--ease);
}
.to-top.is-visible{opacity:1;visibility:visible;transform:none}
.to-top:hover{border-color:var(--volt);color:var(--volt)}

/* ---------- 12. 响应式 ---------- */
@media (max-width:1080px){
  .archive-progress{display:none}
  .footer-grid{grid-template-columns:1.4fr 1fr 1fr}
  .footer-col--brand{grid-column:1 / -1}
}
@media (max-width:900px){
  .header-nav__inner{padding-block:8px;gap:12px}
  .nav-toggle{display:inline-flex}
  .header-nav__utility{display:none}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    padding-inline:clamp(16px,4vw,40px);
    background:linear-gradient(180deg,#13204A 0%,#0A1330 100%);
    border-bottom:1px solid var(--line);
    box-shadow:0 26px 52px rgba(4,8,22,.72);
    overflow:hidden;max-height:0;opacity:0;visibility:hidden;
    transition:max-height .34s var(--ease),opacity .24s var(--ease),visibility .24s var(--ease);
  }
  .site-nav[data-open="true"]{max-height:min(72vh,560px);opacity:1;visibility:visible;overflow-y:auto}
  .site-nav__list{flex-direction:column;gap:0;padding-block:8px 18px}
  .site-nav__item{width:100%}
  .site-nav__link{
    width:100%;justify-content:space-between;padding:15px 2px;font-size:17px;
    border-bottom:1px dashed rgba(232,238,249,.12);
  }
  .site-nav__link::after{left:2px;bottom:0;transform:none;border-radius:2px;height:2px}
  .site-nav__link:hover::after{width:52px}
  .site-nav__link[aria-current="page"]::after{width:68px}
  .bento{grid-template-columns:repeat(6,minmax(0,1fr));gap:16px}
  .b-1,.b-2,.b-3,.b-4{grid-column:span 3}
  .b-5,.b-6,.b-7,.b-8,.b-9,.b-10,.b-11,.b-12{grid-column:span 6}
  .footer-grid{grid-template-columns:1fr 1fr;gap:26px}
  .footer-col--brand{grid-column:1 / -1}
}
@media (max-width:640px){
  .header-top__inner{min-height:58px;gap:12px}
  .brand__line{display:none}
  .btn--sm{padding:8px 13px;font-size:13px}
  .bento{grid-template-columns:repeat(4,minmax(0,1fr))}
  .b-1,.b-2,.b-3,.b-4,.b-5,.b-6,.b-7,.b-8,.b-9,.b-10,.b-11,.b-12{grid-column:span 4}
  .footer-grid{grid-template-columns:1fr}
  .footer-bottom__inner{flex-direction:column;align-items:flex-start}
  .num-block__value{font-size:clamp(2.2rem,12vw,3.4rem)}
}

/* ---------- 13. 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;
  }
  .has-js [data-reveal]{opacity:1;transform:none}
  .btn:hover,.ink-card:hover{transform:none}
  .to-top{transform:none}
}