/* =========================================================
   云开体育 · 共享层样式 /assets/site.css
   夜空蓝基底 · 荧光青数据高亮 · 信号橙动作 · 等宽索引
   ========================================================= */

:root{
  --sky-900:#0A1730;
  --sky-800:#122748;
  --blue-600:#1E4D8F;
  --cyan:#38F2D2;
  --orange:#FF6B2C;
  --sand:#E9C46A;
  --grass:#2FA36B;
  --star:#F3F7FF;
  --mist:#93A7C4;
  --hair:rgba(255,255,255,.10);
  --hair-strong:rgba(255,255,255,.22);
  --paper:#F4F7FB;
  --ink:#0A1730;
  --ink-soft:#41567A;

  --font-display:'Barlow Condensed','Oswald','Noto Sans SC','Source Han Sans SC',system-ui,sans-serif;
  --font-num:'JetBrains Mono','IBM Plex Mono',ui-monospace,'SFMono-Regular',Menlo,Consolas,monospace;
  --font-body:'Noto Sans SC','Source Han Sans SC',system-ui,-apple-system,'Segoe UI',sans-serif;

  --fs-12:12px; --fs-14:14px; --fs-16:16px; --fs-20:20px;
  --fs-28:28px; --fs-44:44px; --fs-72:72px; --fs-120:120px;

  --w-container:1320px;
  --pad-inline:clamp(16px,4vw,40px);
  --shadow-soft:0 1px 0 rgba(255,255,255,.04),0 14px 34px -26px rgba(0,0,0,.9);
  --ease:cubic-bezier(.2,.7,.3,1);
  --dur:180ms;
}

*,*::before,*::after{box-sizing:border-box}

html{
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
}

body{
  margin:0;
  min-height:100%;
  font-family:var(--font-body);
  font-size:var(--fs-16);
  line-height:1.75;
  letter-spacing:.01em;
  color:var(--star);
  background-color:var(--sky-900);
  background-image:
    radial-gradient(900px 520px at 78% -8%,rgba(30,77,143,.42),transparent 68%),
    radial-gradient(700px 420px at 6% 4%,rgba(56,242,210,.08),transparent 66%),
    radial-gradient(1100px 620px at 50% 118%,rgba(255,107,44,.10),transparent 72%);
  -webkit-font-smoothing:antialiased;
  overflow-x:hidden;
}

img,svg,video{max-width:100%;display:block}
a{color:inherit;text-decoration:none}
button{font:inherit;color:inherit;background:none;border:0}
ul,ol{margin:0;padding:0;list-style:none}
h1,h2,h3,h4,p,figure,blockquote{margin:0}
table{border-collapse:collapse;width:100%}

:focus-visible{outline:2px solid var(--cyan);outline-offset:2px;border-radius:1px}
::selection{background:var(--cyan);color:var(--sky-900)}

.visually-hidden{
  position:absolute;width:1px;height:1px;margin:-1px;padding:0;
  overflow:hidden;clip:rect(0 0 0 0);white-space:nowrap;border:0;
}

/* ---------- 布局与排版工具 ---------- */
.container{
  width:100%;
  max-width:var(--w-container);
  margin-inline:auto;
  padding-inline:var(--pad-inline);
}

.display{
  font-family:var(--font-display);
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.04;
}

.num{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-feature-settings:"tnum" 1;
  letter-spacing:-.01em;
}

.index-label{
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}

.hair{height:1px;border:0;margin:0;background:var(--hair)}

.grid-lines::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:linear-gradient(90deg,var(--hair) 1px,transparent 1px);
  background-size:clamp(64px,8vw,110px) 100%;
  opacity:.55;
}

.slice-top{clip-path:polygon(0 2.2vw,100% 0,100% 100%,0 100%)}
.slice-bottom{clip-path:polygon(0 0,100% 0,100% 100%,0 calc(100% - 2.2vw))}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:var(--pad-inline);
  top:8px;
  z-index:120;
  padding:10px 16px;
  border-radius:2px;
  background:var(--cyan);
  color:var(--sky-900);
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.16em;
  text-transform:uppercase;
  transform:translateY(-180%);
  transition:transform var(--dur) var(--ease);
}
.skip-link:focus{transform:translateY(0)}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 18px;
  border:1px solid var(--hair-strong);
  border-radius:2px;
  background:transparent;
  color:var(--star);
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.16em;
  text-transform:uppercase;
  white-space:nowrap;
  cursor:pointer;
  transition:background var(--dur) var(--ease),color var(--dur) var(--ease),
             border-color var(--dur) var(--ease),transform var(--dur) var(--ease);
}
.btn:hover{border-color:var(--cyan);color:var(--cyan)}
.btn:active{transform:translateY(1px)}
.btn--primary{
  background:var(--orange);
  border-color:var(--orange);
  color:#16110C;
  font-weight:700;
}
.btn--primary:hover{background:#FF8350;border-color:#FF8350;color:#16110C}
.btn--ghost{border-color:var(--hair-strong);color:var(--star)}
.btn--ghost:hover{
  border-color:var(--cyan);
  color:var(--cyan);
  background:rgba(56,242,210,.08);
}
.btn--solid{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#06231E;
  font-weight:700;
}
.btn--solid:hover{background:#6BF7DD;border-color:#6BF7DD;color:#06231E}
.btn--sm{padding:8px 13px;letter-spacing:.14em}

/* ---------- 页头：双层常驻 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:60;
  background:rgba(10,23,48,.88);
  -webkit-backdrop-filter:blur(12px);
  backdrop-filter:blur(12px);
  border-bottom:1px solid var(--hair);
  transition:background var(--dur) var(--ease),box-shadow var(--dur) var(--ease);
}
.site-header.is-scrolled{
  background:rgba(8,18,38,.96);
  box-shadow:0 22px 44px -36px rgba(0,0,0,.95);
}

.header-top{position:relative}
.header-top-inner{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:clamp(14px,3vw,36px);
  padding-block:14px;
}

.brand-block{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
}
.brand-mark{
  display:grid;
  place-items:center;
  width:38px;
  height:38px;
  border:1px solid var(--hair-strong);
  border-radius:2px 0 2px 2px;
  background:linear-gradient(140deg,rgba(30,77,143,.6),rgba(56,242,210,.14));
  color:var(--cyan);
  font-family:var(--font-display);
  font-size:20px;
  font-weight:600;
  line-height:1;
  clip-path:polygon(0 0,100% 0,100% 72%,72% 100%,0 100%);
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.brand-block:hover .brand-mark{border-color:var(--cyan);color:var(--star)}
.brand-text{display:flex;flex-direction:column;gap:2px}
.brand-name{
  font-family:var(--font-display);
  font-size:var(--fs-20);
  font-weight:600;
  letter-spacing:.10em;
  line-height:1.15;
  color:var(--star);
}
.brand-line{
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.16em;
  line-height:1.3;
  text-transform:uppercase;
  color:var(--mist);
}

.brand-note{
  flex:1 1 220px;
  max-width:420px;
  font-size:var(--fs-14);
  line-height:1.6;
  color:var(--mist);
}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  margin-left:auto;
  flex:0 0 auto;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:10px;
  margin-left:auto;
  padding:10px 14px;
  border:1px solid var(--hair-strong);
  border-radius:2px;
  color:var(--star);
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.16em;
  text-transform:uppercase;
  cursor:pointer;
  transition:border-color var(--dur) var(--ease),color var(--dur) var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan);color:var(--cyan)}
.nav-toggle-bars{display:flex;flex-direction:column;gap:4px;width:18px}
.nav-toggle-bars span{
  display:block;
  height:1px;
  background:currentColor;
  transition:transform var(--dur) var(--ease),opacity var(--dur) var(--ease);
}
.site-header[data-open] .nav-toggle-bars span:nth-child(1){transform:translateY(5px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars span:nth-child(2){opacity:0}
.site-header[data-open] .nav-toggle-bars span:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.header-nav{
  position:relative;
  background:linear-gradient(180deg,rgba(18,39,72,.72),rgba(10,23,48,.5));
  border-top:1px solid var(--hair);
  border-bottom:1px solid var(--hair);
}
.nav-list{
  display:flex;
  align-items:stretch;
  overflow-x:auto;
  scrollbar-width:thin;
}
.nav-item{flex:0 0 auto}
.nav-link{
  position:relative;
  display:inline-flex;
  align-items:center;
  padding:15px 20px;
  color:var(--mist);
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.18em;
  text-transform:uppercase;
  transition:color var(--dur) var(--ease);
}
.nav-link::after{
  content:"";
  position:absolute;
  left:20px;
  right:20px;
  bottom:0;
  height:2px;
  background:var(--cyan);
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform var(--dur) var(--ease),background var(--dur) var(--ease);
}
.nav-link:hover{color:var(--star)}
.nav-link:hover::after{transform:scaleX(1)}
.nav-link[aria-current="page"]{color:var(--cyan)}
.nav-link[aria-current="page"]::after{transform:scaleX(1);background:var(--orange)}

/* ---------- 页脚：三段式脚注带 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(48px,7vw,96px);
  border-top:1px solid var(--hair);
  background:linear-gradient(180deg,rgba(10,23,48,.4),rgba(18,39,72,.85) 42%,rgba(10,23,48,.98));
  color:var(--star);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:
    radial-gradient(760px 320px at 88% 0%,rgba(56,242,210,.10),transparent 65%),
    radial-gradient(620px 300px at 4% 100%,rgba(255,107,44,.10),transparent 68%);
}

.footer-band{
  position:relative;
  z-index:1;
  padding-block:clamp(40px,6vw,72px);
}
.footer-band-inner{
  display:grid;
  grid-template-columns:minmax(220px,1fr) 2.4fr;
  gap:clamp(24px,4vw,56px);
}
.footer-brand{
  display:flex;
  flex-direction:column;
  gap:12px;
  padding-left:20px;
  border-left:1px solid var(--hair);
}
.footer-brand-mark{
  font-family:var(--font-display);
  font-size:var(--fs-28);
  font-weight:600;
  letter-spacing:.08em;
  line-height:1.1;
  color:var(--star);
}
.footer-brand-note{
  max-width:34ch;
  font-size:var(--fs-14);
  line-height:1.7;
  color:var(--mist);
}

.footer-grid{
  display:grid;
  grid-template-columns:repeat(3,minmax(0,1fr));
  gap:clamp(20px,3vw,40px);
}
.footer-col-title{
  margin-bottom:14px;
  font-family:var(--font-num);
  font-size:var(--fs-12);
  font-weight:400;
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--sand);
}
.footer-list{display:flex;flex-direction:column;gap:9px}
.footer-link{
  position:relative;
  font-size:var(--fs-14);
  line-height:1.6;
  color:var(--mist);
  transition:color var(--dur) var(--ease),padding-left var(--dur) var(--ease);
}
.footer-link::before{
  content:"";
  position:absolute;
  left:0;
  top:50%;
  width:0;
  height:1px;
  background:var(--cyan);
  transition:width var(--dur) var(--ease);
}
.footer-link:hover{color:var(--star);padding-left:14px}
.footer-link:hover::before{width:10px}

.footer-contact-band{
  position:relative;
  z-index:1;
  padding-block:22px;
  border-top:1px solid var(--hair);
}
.footer-contact-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:8px 32px;
}
.footer-contact-line{
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.10em;
  color:var(--mist);
}
.footer-address{font-size:var(--fs-14);color:var(--mist)}

.footer-legal-band{
  position:relative;
  z-index:1;
  padding-block:18px;
  border-top:1px solid var(--hair);
  background:rgba(6,14,30,.6);
}
.footer-legal-inner{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:10px 28px;
}
.footer-legal,
.footer-version{
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.08em;
  color:var(--mist);
}
.footer-legal a{
  padding-bottom:1px;
  border-bottom:1px solid var(--hair-strong);
  transition:color var(--dur) var(--ease),border-color var(--dur) var(--ease);
}
.footer-legal a:hover{color:var(--cyan);border-color:var(--cyan)}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding-top:18px}
.breadcrumb-list{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.breadcrumb-item{display:inline-flex;align-items:center;gap:10px}
.breadcrumb-item + .breadcrumb-item::before{content:"/";color:var(--hair-strong)}
.breadcrumb-link{color:var(--mist);transition:color var(--dur) var(--ease)}
.breadcrumb-link:hover{color:var(--cyan)}
.breadcrumb-current{color:var(--sand)}

/* ---------- 正文容器 ---------- */
.prose{
  max-width:74ch;
  font-size:var(--fs-16);
  line-height:1.8;
  color:rgba(243,247,255,.86);
}
.prose > * + *{margin-top:1.1em}
.prose h2{
  margin-top:1.6em;
  font-family:var(--font-display);
  font-size:clamp(24px,3.4vw,44px);
  font-weight:600;
  line-height:1.16;
  letter-spacing:.02em;
  color:var(--star);
}
.prose h3{font-size:var(--fs-20);font-weight:600;color:var(--star)}
.prose a{color:var(--cyan);border-bottom:1px solid rgba(56,242,210,.4)}
.prose a:hover{border-color:var(--cyan)}
.prose li{position:relative;padding-left:20px}
.prose li + li{margin-top:.5em}
.prose li::before{
  content:"";
  position:absolute;
  left:0;
  top:.78em;
  width:8px;
  height:1px;
  background:var(--sand);
}
.prose--ink{color:#2A3B57}
.prose--ink h2,.prose--ink h3{color:var(--ink)}
.prose--ink a{color:#0C6E5C;border-color:rgba(12,110,92,.4)}

/* ---------- 分区节奏 ---------- */
.section{position:relative;padding-block:clamp(44px,7vw,96px)}
.section--tight{padding-block:clamp(28px,4vw,52px)}
.section--paper{background:var(--paper);color:var(--ink)}
.section--paper .section-title{color:var(--ink)}
.section--paper .section-note{color:var(--ink-soft)}
.section--paper .index-label{color:#5A7396}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:16px 32px;
  padding-bottom:18px;
  margin-bottom:clamp(24px,3.4vw,40px);
  border-bottom:1px solid var(--hair);
}
.section--paper .section-head{border-color:rgba(10,23,48,.12)}
.section-title{
  font-family:var(--font-display);
  font-size:clamp(28px,4.4vw,72px);
  font-weight:600;
  line-height:1.02;
  letter-spacing:.02em;
  color:var(--star);
}
.section-note{
  max-width:46ch;
  font-size:var(--fs-14);
  line-height:1.7;
  color:var(--mist);
}

/* ---------- 网格 ---------- */
.grid{display:grid;gap:clamp(16px,2.4vw,28px)}
.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-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.4vw,28px);
}
.span-3{grid-column:span 3}
.span-4{grid-column:span 4}
.span-5{grid-column:span 5}
.span-6{grid-column:span 6}
.span-7{grid-column:span 7}
.span-8{grid-column:span 8}
.span-12{grid-column:span 12}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  padding:clamp(18px,2.2vw,26px);
  border:1px solid var(--hair);
  border-radius:2px;
  background:linear-gradient(160deg,rgba(18,39,72,.78),rgba(10,23,48,.62));
  box-shadow:var(--shadow-soft);
  transition:border-color var(--dur) var(--ease),transform var(--dur) var(--ease),
             background var(--dur) var(--ease);
}
.card:hover{
  border-color:rgba(56,242,210,.55);
  transform:translateY(-2px);
}
.card-title{
  font-family:var(--font-display);
  font-size:clamp(20px,2.4vw,28px);
  font-weight:600;
  line-height:1.2;
  letter-spacing:.02em;
  color:var(--star);
}
.card-note{
  margin-top:10px;
  font-size:var(--fs-14);
  line-height:1.7;
  color:var(--mist);
}
.card-index{
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.18em;
  color:var(--sand);
}
.section--paper .card{
  background:#FFFFFF;
  border-color:rgba(10,23,48,.12);
  box-shadow:0 12px 30px -26px rgba(10,23,48,.5);
}
.section--paper .card:hover{border-color:rgba(12,110,92,.5)}
.section--paper .card-title{color:var(--ink)}
.section--paper .card-note{color:var(--ink-soft)}
.section--paper .card-index{color:#9A7B1F}

/* ---------- 数据 ---------- */
.stat{display:flex;flex-direction:column;gap:6px}
.stat-num{
  font-family:var(--font-num);
  font-variant-numeric:tabular-nums;
  font-size:clamp(44px,7vw,120px);
  line-height:.92;
  letter-spacing:-.02em;
  color:var(--cyan);
}
.stat-num--orange{color:var(--orange)}
.stat-num--sand{color:var(--sand)}
.stat-num--grass{color:var(--grass)}
.stat-label{
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.18em;
  text-transform:uppercase;
  color:var(--mist);
}
.section--paper .stat-label{color:#5A7396}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--hair-strong);
  border-radius:999px;
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.14em;
  text-transform:uppercase;
  color:var(--mist);
}
.tag--cyan{color:var(--cyan);border-color:rgba(56,242,210,.45);background:rgba(56,242,210,.08)}
.tag--orange{color:var(--orange);border-color:rgba(255,107,44,.45);background:rgba(255,107,44,.08)}
.tag--sand{color:var(--sand);border-color:rgba(233,196,106,.45);background:rgba(233,196,106,.08)}
.tag--grass{color:var(--grass);border-color:rgba(47,163,107,.5);background:rgba(47,163,107,.10)}

/* ---------- 图片容器（页面阶段放置图片） ---------- */
.media-frame{
  position:relative;
  display:block;
  overflow:hidden;
  width:100%;
  aspect-ratio:16/10;
  border:1px solid var(--hair);
  border-radius:2px;
  background:
    linear-gradient(150deg,var(--sky-800) 0%,#0A1730 58%,#1E4D8F 100%);
}
.media-frame img{
  width:100%;
  height:100%;
  object-fit:cover;
  display:block;
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:linear-gradient(180deg,rgba(10,23,48,0) 42%,rgba(10,23,48,.74) 100%);
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--portrait{aspect-ratio:3/4}
.media-frame--tall{aspect-ratio:2/3}
.media-frame--square{aspect-ratio:1/1}
.media-frame--slanted{clip-path:polygon(0 0,100% 0,100% 90%,0 100%)}
.media-caption{
  margin-top:10px;
  font-family:var(--font-num);
  font-size:var(--fs-12);
  letter-spacing:.12em;
  line-height:1.6;
  color:var(--mist);
}
.section--paper .media-caption{color:var(--ink-soft)}

/* ---------- 编辑部目录索引条 ---------- */
.index-bar{
  display:flex;
  overflow-x:auto;
  border-top:1px solid var(--hair);
  border-bottom:1px solid var(--hair);
  scrollbar-width:thin;
}
.index-cell{
  flex:1 1 0;
  min-width:210px;
  padding:18px 20px;
  border-right:1px solid var(--hair);
  transition:background var(--dur) var(--ease);
}
.index-cell:last-child{border-right:0}
.index-cell:hover{background:rgba(56,242,210,.07)}
.section--paper .index-bar{border-color:rgba(10,23,48,.12)}
.section--paper .index-cell{border-color:rgba(10,23,48,.12)}
.section--paper .index-cell:hover{background:rgba(12,110,92,.07)}

/* ---------- 滚动进度条 ---------- */
.scroll-progress{
  position:fixed;
  top:0;
  left:0;
  z-index:90;
  width:100%;
  height:2px;
  background:linear-gradient(90deg,var(--cyan),var(--sand) 55%,var(--orange));
  transform:scaleX(0);
  transform-origin:0 50%;
  pointer-events:none;
}

/* ---------- 入场显现 ---------- */
.js-ready [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity 240ms var(--ease),transform 240ms var(--ease);
}
.js-ready [data-reveal].is-visible{opacity:1;transform:none}

@keyframes navDrop{
  from{opacity:0;transform:translateY(-6px)}
  to{opacity:1;transform:none}
}

/* ---------- 平板 ---------- */
@media (max-width:1080px){
  .footer-band-inner{grid-template-columns:minmax(0,1fr);gap:32px}
  .footer-brand{
    padding-left:0;
    padding-top:20px;
    border-left:0;
    border-top:1px solid var(--hair);
  }
}

/* ---------- 移动导航 ---------- */
@media (max-width:900px){
  .brand-note{display:none}
  .header-actions{display:none}
  .nav-toggle{display:inline-flex;margin-left:auto}

  .header-nav{
    display:none;
    background:linear-gradient(180deg,rgba(18,39,72,.96),rgba(10,23,48,.99));
  }
  .site-header[data-open] .header-nav{
    display:block;
    animation:navDrop 180ms var(--ease);
  }
  .nav-list{flex-direction:column;overflow:visible}
  .nav-item{width:100%}
  .nav-link{
    width:100%;
    padding:15px 0;
    justify-content:flex-start;
    border-bottom:1px solid var(--hair);
  }
  .nav-link::after{left:0;right:0}
  .nav-item:last-child .nav-link{border-bottom:0}

  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .span-3,.span-4{grid-column:span 3}
  .span-5,.span-6,.span-7,.span-8{grid-column:span 6}
  .span-12{grid-column:span 6}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
}

/* ---------- 手机 ---------- */
@media (max-width:640px){
  .header-top-inner{gap:12px;padding-block:10px}
  .brand-mark{width:32px;height:32px;font-size:17px}
  .brand-name{font-size:var(--fs-16);letter-spacing:.08em}
  .brand-line{letter-spacing:.10em}
  .nav-toggle{padding:9px 12px;letter-spacing:.12em}

  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
  .grid-12{grid-template-columns:minmax(0,1fr)}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-12{grid-column:span 1}

  .footer-grid{grid-template-columns:minmax(0,1fr)}
  .footer-contact-inner{flex-direction:column;align-items:flex-start}
  .footer-legal-inner{flex-direction:column;align-items:flex-start}
  .footer-contact-line{letter-spacing:.04em;line-height:1.7}

  .index-cell{min-width:78%}
  .section-head{align-items:flex-start}
}

/* ---------- 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;
  }
  .js-ready [data-reveal]{opacity:1;transform:none}
  .scroll-progress{display:none}
}