/* ============================================================
   LEYU · CN · V4  —  /assets/site.css
   共享外壳：reset / tokens / 中文排版 / 头部 / 页脚 / 基础组件
   ============================================================ */

/* ---------- 1. Reset ---------- */
*,*::before,*::after{box-sizing:border-box}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;overflow-x:clip}
body,h1,h2,h3,h4,h5,h6,p,figure,blockquote,ul,ol,dl{margin:0}
ul,ol{padding:0;list-style:none}
img,svg,video,picture{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0;padding:0;cursor:pointer}
a{color:inherit}
[hidden]{display:none!important}

/* ---------- 2. Tokens ---------- */
:root{
  --deep:#0A2B2C;
  --deep-2:#071F20;
  --deep-3:#05191A;
  --sand:#F5F0E6;
  --sand-2:#EDE6D8;
  --stone:#E6DFD1;
  --paper:#FFFCF5;
  --teal:#10BFB0;
  --teal-deep:#0A6B63;
  --fluor:#6FF7E4;
  --coral:#FF6A3D;
  --coral-deep:#C4431C;
  --rock:#3A4A4B;
  --moss:#5B7A5E;
  --moss-tint:#DDE5DC;
  --clay:#B96A44;
  --clay-deep:#8E4A28;
  --mist:#A8C6C3;
  --ink:#0B1213;
  --sans:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Source Han Sans SC","Noto Sans CJK SC",system-ui,-apple-system,"Segoe UI",sans-serif;
  --mono:ui-monospace,SFMono-Regular,"JetBrains Mono","SF Mono",Menlo,Consolas,monospace;
  --wrap:1240px;
  --pad:clamp(16px,4vw,56px);
  --ease:cubic-bezier(.22,.72,.24,1);
  --r-sm:4px;
  --r-md:14px;
  --r-lg:26px;
}

/* ---------- 3. 基础排版 ---------- */
body{
  font-family:var(--sans);
  font-size:clamp(15px,1.02vw,17px);
  line-height:1.75;
  color:var(--ink);
  background:var(--sand);
  font-kerning:normal;
  word-break:normal;
  line-break:loose;
  -webkit-font-smoothing:antialiased;
}
body.is-locked{overflow:hidden}
h1,h2,h3,h4{line-height:1.2;letter-spacing:-.01em}
strong{font-weight:800}
::selection{background:var(--fluor);color:var(--deep)}

/* ---------- 4. 容器 / 可访问 ---------- */
.wrap{
  width:100%;
  max-width:calc(var(--wrap) + var(--pad)*2);
  margin-inline:auto;
  padding-inline:var(--pad);
}
.skip-link{
  position:fixed;top:0;left:0;z-index:200;
  transform:translateY(-160%);
  background:var(--coral);color:var(--ink);
  font-weight:800;font-size:14px;letter-spacing:.04em;
  padding:12px 20px;text-decoration:none;
  border-radius:0 0 var(--r-sm) 0;
  transition:transform 200ms var(--ease);
}
.skip-link:focus{transform:translateY(0)}
:focus-visible{
  outline:2px solid var(--fluor);
  outline-offset:3px;
  box-shadow:0 0 0 5px rgba(10,43,44,.5);
  border-radius:3px;
}

/* ============================================================
   5. 头部：双层索引卡
   ============================================================ */
.site-header{
  position:sticky;top:0;z-index:80;
  background:var(--deep);
  color:var(--sand);
  isolation:isolate;
}

/* 5.1 上层 —— 品牌信息带 */
.header-tier-one{
  background-image:
    radial-gradient(120% 180% at 100% 0%,rgba(16,191,176,.18),transparent 58%),
    linear-gradient(90deg,rgba(111,247,228,.06),transparent 40%);
}
.tier-one-inner{
  display:flex;align-items:center;
  gap:clamp(12px,2.4vw,32px);
  padding-block:12px;
  transition:padding-block 240ms var(--ease);
}
.brand{
  display:inline-flex;align-items:baseline;gap:10px;
  text-decoration:none;color:var(--sand);flex:0 0 auto;
}
.brand-mark{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.2em;
  color:var(--fluor);white-space:nowrap;
  transition:font-size 240ms var(--ease);
}
.brand-name{
  display:inline-block;
  font-size:17px;font-weight:900;letter-spacing:.08em;
  transform:skewX(-4deg);
  transition:font-size 240ms var(--ease);
}
.brand:hover .brand-name{color:var(--fluor)}
.tier-one-note{
  font-size:12.5px;letter-spacing:.16em;color:var(--mist);
  padding-left:14px;border-left:1px solid rgba(168,198,195,.28);
  transition:opacity 200ms var(--ease),visibility 200ms var(--ease);
  white-space:nowrap;
}
.utility{
  margin-left:auto;display:flex;align-items:center;gap:8px;
}
.utility-secondary{display:inline-flex;align-items:center}
.utility-secondary + .utility-secondary{border-left:1px solid rgba(168,198,195,.24);padding-left:10px}
.utility-btn{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;
  color:var(--fluor);
  border:1px solid rgba(111,247,228,.45);
  border-radius:999px;
  padding:5px 13px;
  transition:background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),padding 240ms var(--ease),font-size 240ms var(--ease);
}
.utility-btn:hover{background:var(--fluor);color:var(--deep);border-color:var(--fluor)}
.utility-link{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.14em;
  color:var(--mist);text-decoration:none;padding:5px 4px;
  transition:color 200ms var(--ease);
}
.utility-link:hover{color:var(--fluor)}

/* 5.2 下层 —— 栏目索引带 */
.header-tier-two{
  background:rgba(7,31,32,.9);
  border-top:1px solid rgba(168,198,195,.16);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.tier-two-inner{
  display:flex;align-items:center;gap:clamp(12px,2vw,26px);
  justify-content:space-between;
  min-height:46px;
}
.site-nav{flex:1 1 auto;min-width:0}
.nav-list{
  display:flex;align-items:center;
  gap:clamp(10px,1.8vw,28px);
  flex-wrap:nowrap;
}
.nav-list a{
  position:relative;
  display:inline-flex;align-items:baseline;gap:7px;
  padding:13px 0;
  font-size:clamp(13.5px,.98vw,15.5px);
  font-weight:600;letter-spacing:.02em;
  text-decoration:none;color:var(--sand);white-space:nowrap;
  transition:color 200ms var(--ease),transform 220ms var(--ease);
}
.nav-list a::after{
  content:"";position:absolute;left:0;right:100%;bottom:7px;height:2px;
  background:var(--fluor);
  transition:right 260ms var(--ease),background 200ms var(--ease);
}
.nav-list a:hover{color:var(--fluor);transform:skewX(-4deg) translateY(-1px)}
.nav-list a:hover::after{right:0}
.nav-num{
  font-family:var(--mono);font-size:9.5px;letter-spacing:.12em;
  color:var(--mist);opacity:.8;
  transition:color 200ms var(--ease),opacity 200ms var(--ease);
}
.nav-list a[aria-current="page"]{color:var(--fluor)}
.nav-list a[aria-current="page"]::after{right:0;background:var(--coral)}
.nav-list a[aria-current="page"] .nav-num{color:var(--coral);opacity:1}

.header-cta{
  flex:0 0 auto;display:inline-block;
  padding:9px 18px;margin-block:8px;
  font-size:13px;font-weight:800;letter-spacing:.08em;
  color:var(--ink);background:var(--coral);
  text-decoration:none;border-radius:var(--r-sm);
  transform:skewX(-6deg);
  box-shadow:4px 4px 0 rgba(111,247,228,.35);
  transition:transform 220ms var(--ease),background 200ms var(--ease),box-shadow 220ms var(--ease);
}
.header-cta:hover{background:var(--fluor);transform:skewX(-6deg) translate(-2px,-2px);box-shadow:6px 6px 0 rgba(255,106,61,.5)}

/* 5.3 滚动收拢态 */
.site-header[data-condensed] .tier-one-inner{padding-block:4px}
.site-header[data-condensed] .tier-one-note{opacity:0;visibility:hidden}
.site-header[data-condensed] .brand-mark{font-size:10px}
.site-header[data-condensed] .brand-name{font-size:15px}
.site-header[data-condensed] .utility-btn{padding:3px 10px;font-size:9.5px}
.site-header[data-condensed] .header-tier-two{border-top-color:rgba(168,198,195,.06)}

/* 5.4 移动开关 */
.nav-toggle{
  display:none;align-items:center;gap:8px;
  padding:7px 13px;
  border:1px solid rgba(168,198,195,.38);border-radius:999px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;
  color:var(--sand);
  transition:border-color 200ms var(--ease),color 200ms var(--ease);
}
.site-header[data-open] .nav-toggle{border-color:var(--coral);color:var(--coral)}
.nav-toggle-bars{position:relative;display:inline-block;width:16px;height:10px}
.nav-toggle-bars::before,
.nav-toggle-bars::after{
  content:"";position:absolute;left:0;right:0;height:2px;
  background:var(--fluor);
  transition:transform 220ms var(--ease),opacity 180ms var(--ease);
}
.nav-toggle-bars::before{top:0}
.nav-toggle-bars::after{bottom:0}
.site-header[data-open] .nav-toggle-bars::before{transform:translateY(4px) rotate(45deg)}
.site-header[data-open] .nav-toggle-bars::after{transform:translateY(-4px) rotate(-45deg)}

/* 5.5 阅读进度光带 */
.scroll-meter{
  position:absolute;left:0;right:0;bottom:0;height:3px;
  background:linear-gradient(90deg,rgba(16,191,176,.28),rgba(185,106,68,.28));
  pointer-events:none;
}
.scroll-meter > span{
  display:block;height:100%;width:0;
  background:linear-gradient(90deg,var(--teal),var(--fluor) 60%,var(--coral));
  transition:width 140ms linear;
}

/* ============================================================
   6. 全站索引浮层
   ============================================================ */
.index-panel{
  position:fixed;inset:0;z-index:120;
  overflow-y:auto;-webkit-overflow-scrolling:touch;
  padding-block:clamp(26px,5vw,64px) clamp(36px,6vw,72px);
  background:
    radial-gradient(110% 90% at 88% 0%,#0F3B3A 0%,rgba(10,43,44,.98) 52%,var(--deep-3) 100%);
  color:var(--sand);
  animation:index-drop 260ms var(--ease) both;
}
@keyframes index-drop{from{opacity:0;transform:translateY(-10px)}to{opacity:1;transform:none}}
.index-inner{display:block}
.index-head{
  display:flex;align-items:center;justify-content:space-between;gap:16px;
  padding-bottom:14px;
  border-bottom:1px solid rgba(168,198,195,.28);
}
.index-title{
  font-family:var(--mono);font-size:11.5px;letter-spacing:.28em;color:var(--fluor);
}
.index-close{
  font-family:var(--mono);font-size:11px;letter-spacing:.18em;
  color:var(--coral);
  border:1px solid rgba(255,106,61,.6);border-radius:999px;
  padding:6px 16px;
  transition:background 200ms var(--ease),color 200ms var(--ease);
}
.index-close:hover{background:var(--coral);color:var(--ink)}
.index-list{
  display:grid;grid-template-columns:repeat(auto-fit,minmax(230px,1fr));
  gap:0 clamp(18px,4vw,60px);margin-top:18px;
}
.index-list li{border-bottom:1px solid rgba(168,198,195,.16)}
.index-link{
  display:flex;align-items:baseline;gap:14px;
  padding:15px 6px;
  font-size:clamp(17px,2vw,22px);font-weight:700;letter-spacing:.02em;
  color:var(--sand);text-decoration:none;
  transition:color 200ms var(--ease),transform 220ms var(--ease),background 200ms var(--ease);
}
.index-link:hover{color:var(--fluor);transform:translateX(6px);background:rgba(111,247,228,.06)}
.index-num{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;color:var(--mist);
}
.index-link:hover .index-num{color:var(--coral)}
.index-foot{
  margin-top:24px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.2em;color:var(--mist);
}

/* ============================================================
   7. 页脚：矿物色收束面
   ============================================================ */
.site-footer{
  position:relative;
  margin-top:clamp(48px,8vw,120px);
  background:
    radial-gradient(120% 90% at 0% 0%,#0E3738 0%,var(--deep) 46%,var(--deep-3) 100%);
  color:var(--sand);
  padding-top:calc(clamp(38px,6vw,80px) + 22px);
  clip-path:polygon(0 30px,100% 0,100% 100%,0 100%);
}
.footer-seam{
  width:calc(100% - var(--pad)*2);
  max-width:var(--wrap);
  height:4px;margin:0 auto clamp(26px,4vw,48px);
  border-radius:2px;
  background:linear-gradient(90deg,var(--teal) 0 32%,var(--fluor) 32% 48%,var(--coral) 48% 72%,var(--clay) 72% 100%);
  opacity:.85;
}
.footer-inner{
  display:grid;grid-template-columns:1.05fr 1.6fr;
  gap:clamp(28px,4vw,64px);
  align-items:start;
}
.footer-brand{display:flex;flex-direction:column;align-items:flex-start;gap:8px}
.footer-logo{
  display:inline-block;
  font-size:clamp(28px,3.8vw,44px);font-weight:900;letter-spacing:.02em;
  color:var(--sand);text-decoration:none;line-height:1.05;
  transform:skewX(-4deg);
  transition:color 200ms var(--ease);
}
.footer-logo:hover{color:var(--fluor)}
.footer-mark{
  font-family:var(--mono);font-size:10.5px;letter-spacing:.26em;color:var(--fluor);
}
.footer-tagline{font-size:13.5px;color:var(--mist);letter-spacing:.02em;max-width:20em}
.to-top{
  margin-top:14px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.18em;
  color:var(--sand);
  border:1px solid rgba(168,198,195,.4);border-radius:999px;
  padding:7px 16px;
  transition:background 200ms var(--ease),color 200ms var(--ease),border-color 200ms var(--ease),transform 220ms var(--ease);
}
.to-top:hover{background:var(--fluor);color:var(--deep);border-color:var(--fluor);transform:translateY(-2px)}

.footer-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:clamp(18px,3vw,40px)}
.footer-col-title{
  font-family:var(--mono);font-size:10.5px;font-weight:400;
  letter-spacing:.24em;color:var(--coral);
  padding-bottom:9px;margin-bottom:8px;
  border-bottom:1px solid rgba(168,198,195,.22);
}
.footer-col ul{display:flex;flex-direction:column}
.footer-link{
  display:inline-block;
  padding:6px 0;
  font-size:14.5px;color:rgba(245,240,230,.84);text-decoration:none;
  transition:color 200ms var(--ease),transform 220ms var(--ease);
}
.footer-link:hover{color:var(--fluor);transform:translateX(4px)}

.footer-contact{
  margin-top:clamp(28px,4vw,52px);
  padding-top:22px;
  border-top:1px solid rgba(168,198,195,.22);
  display:grid;gap:8px;
}
.contact-line{
  font-family:var(--mono);font-size:12px;letter-spacing:.06em;
  color:var(--sand);word-break:break-word;line-height:1.9;
}
.contact-note{font-size:12.5px;line-height:1.8;color:var(--mist);max-width:64ch}

.footer-legal{
  margin-top:clamp(22px,3vw,38px);
  padding-block:20px 28px;
  border-top:1px solid rgba(168,198,195,.16);
  display:flex;flex-wrap:wrap;align-items:center;justify-content:space-between;
  gap:10px 24px;
}
.legal-copy{font-size:12px;color:var(--mist);letter-spacing:.04em}
.legal-copy [data-year]{font-family:var(--mono);color:var(--sand)}
.legal-links{display:flex;flex-wrap:wrap;gap:8px 20px}
.legal-links a{
  font-size:12px;color:rgba(245,240,230,.82);text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color 200ms var(--ease),border-color 200ms var(--ease);
}
.legal-links a:hover{color:var(--fluor);border-bottom-color:var(--fluor)}
.footer-update{
  width:100%;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.12em;
  color:rgba(168,198,195,.72);
}

/* ============================================================
   8. 页面级基础组件
   ============================================================ */

/* 8.1 分区 */
.section{padding-block:clamp(42px,7vw,104px)}
.section--deep{background:var(--deep);color:var(--sand)}
.section--stone{background:var(--stone)}
.section--moss{background:var(--moss-tint);color:var(--ink)}
.section--deep .lead{color:var(--mist)}
.section--deep .eyebrow{color:var(--fluor)}
.section--deep .rule{background:rgba(168,198,195,.28)}

/* 8.2 标题族 */
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--mono);font-size:11px;letter-spacing:.26em;
  color:var(--teal-deep);
  margin-bottom:14px;
}
.eyebrow::before{content:"";display:inline-block;width:26px;height:2px;background:var(--coral)}
.display{
  font-size:clamp(36px,8.2vw,116px);
  line-height:.98;font-weight:200;letter-spacing:-.02em;
  color:var(--deep);
}
.display strong{
  font-weight:900;font-style:normal;
  display:inline-block;transform:skewX(-4deg);
  color:var(--teal-deep);
}
.section--deep .display{color:var(--sand)}
.section--deep .display strong{color:var(--fluor)}
.section-title{
  font-size:clamp(25px,3.6vw,46px);
  line-height:1.14;font-weight:800;letter-spacing:-.012em;
}
.lead{
  margin-top:14px;
  font-size:clamp(15.5px,1.35vw,18.5px);
  line-height:1.8;color:var(--rock);max-width:32em;
}
.prose{max-width:34em;color:var(--rock)}
.prose p + p{margin-top:1em}
.prose h3{margin-top:1.9em;margin-bottom:.5em;font-size:clamp(18px,1.7vw,22px);color:var(--ink)}
.prose ul{margin-top:.6em;display:grid;gap:.45em}
.prose ul li{position:relative;padding-left:1.1em}
.prose ul li::before{content:"";position:absolute;left:0;top:.72em;width:6px;height:6px;background:var(--teal);border-radius:50%}
.section--deep .prose,.section--deep .prose h3{color:var(--sand)}
.section--deep .prose p{color:var(--mist)}
.num{font-family:var(--mono);font-size:.72em;letter-spacing:.18em;color:var(--clay-deep)}
.rule{border:0;height:1px;background:rgba(58,74,75,.2);margin-block:clamp(22px,4vw,46px)}

/* 8.3 按钮 */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:12px 22px;
  font-size:14.5px;font-weight:800;letter-spacing:.05em;
  text-decoration:none;border-radius:var(--r-sm);
  border:1px solid transparent;
  transition:transform 200ms var(--ease),background 200ms var(--ease),color 200ms var(--ease),box-shadow 220ms var(--ease),border-color 200ms var(--ease);
}
.btn--primary{background:var(--coral);color:var(--ink);box-shadow:4px 4px 0 rgba(10,43,44,.16)}
.btn--primary:hover{transform:translate(-2px,-2px);box-shadow:6px 6px 0 rgba(10,43,44,.24);background:#FF7F57}
.btn--ghost{color:currentColor;border-color:currentColor;background:transparent}
.btn--ghost:hover{background:var(--deep);color:var(--sand);border-color:var(--deep)}
.section--deep .btn--ghost:hover{background:var(--fluor);color:var(--deep);border-color:var(--fluor)}

/* 8.4 标签 */
.tag{
  display:inline-block;padding:3px 11px;
  font-family:var(--mono);font-size:10.5px;letter-spacing:.16em;
  border-radius:999px;
  color:var(--teal-deep);background:rgba(16,191,176,.13);
  border:1px solid rgba(16,191,176,.42);
}
.tag--coral{color:var(--coral-deep);background:rgba(255,106,61,.14);border-color:rgba(255,106,61,.45)}
.tag--moss{color:#3E5A42;background:rgba(91,122,94,.16);border-color:rgba(91,122,94,.42)}
.tag--clay{color:var(--clay-deep);background:rgba(185,106,68,.16);border-color:rgba(185,106,68,.42)}
.section--deep .tag{color:var(--fluor);background:rgba(111,247,228,.1);border-color:rgba(111,247,228,.4)}

/* 8.5 网格 */
.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--aside{grid-template-columns:minmax(0,1.7fr) minmax(0,1fr);align-items:start}

/* 8.6 卡片 */
.card{
  background:var(--paper);
  border:1px solid rgba(58,74,75,.14);
  border-radius:var(--r-md);
  padding:clamp(18px,2.4vw,28px);
}
.card-title{font-size:clamp(17px,1.5vw,20px);font-weight:800;letter-spacing:.01em}
.card-text{margin-top:8px;font-size:14.5px;line-height:1.8;color:var(--rock)}
.section--deep .card{background:rgba(245,240,230,.06);border-color:rgba(168,198,195,.26)}
.section--deep .card-text{color:var(--mist)}
.section--deep .card-title{color:var(--sand)}

/* 8.7 图片容器 */
.media{
  position:relative;overflow:hidden;isolation:isolate;
  aspect-ratio:16/9;
  border-radius:var(--r-md);
  background:
    linear-gradient(135deg,rgba(16,191,176,.18),rgba(185,106,68,.18)),
    var(--stone);
}
.media img{width:100%;height:100%;object-fit:cover}
.media::after{
  content:"";position:absolute;inset:0;pointer-events:none;
  background-image:
    linear-gradient(rgba(11,18,19,.14) 1px,transparent 1px),
    linear-gradient(90deg,rgba(11,18,19,.14) 1px,transparent 1px);
  background-size:46px 46px;
  opacity:.26;mix-blend-mode:overlay;
}
.media--wide{aspect-ratio:21/9}
.media--tall{aspect-ratio:4/5}
.media--square{aspect-ratio:1/1}
.media--skew{border-radius:6px 42px 6px 42px}
.figure-cap{margin-top:10px;font-size:12.5px;line-height:1.7;color:var(--rock)}
.section--deep .figure-cap{color:var(--mist)}

/* 8.8 面包屑 */
.breadcrumb{padding-block:16px;font-family:var(--mono);font-size:11px;letter-spacing:.14em}
.breadcrumb ol{display:flex;flex-wrap:wrap;align-items:center}
.breadcrumb li{display:inline-flex;align-items:center}
.breadcrumb li + li::before{content:"/";margin:0 7px;color:var(--mist)}
.breadcrumb a{color:var(--rock);text-decoration:none;transition:color 200ms var(--ease)}
.breadcrumb a:hover{color:var(--teal-deep)}
.breadcrumb [aria-current="page"]{color:var(--ink)}

/* 8.9 渐显 */
[data-reveal]{
  opacity:0;transform:translateY(14px);
  transition:opacity 420ms var(--ease),transform 420ms var(--ease);
}
[data-reveal].is-in{opacity:1;transform:none}

/* ============================================================
   9. 响应式
   ============================================================ */
@media (max-width:1120px){
  .nav-num{display:none}
  .tier-one-note{display:none}
  .header-cta{padding:8px 14px;font-size:12.5px}
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:900px){
  .site-header{position:sticky}
  .tier-one-inner{padding-block:9px;gap:12px}
  .utility{gap:6px;margin-left:auto}
  .utility-secondary{display:none}
  .tier-two-inner{padding-block:7px;gap:12px}
  .nav-toggle{display:inline-flex}
  .site-nav{
    position:absolute;top:100%;left:0;right:0;
    background:var(--deep-2);
    border-top:1px solid rgba(111,247,228,.28);
    box-shadow:0 26px 48px rgba(0,0,0,.5);
    max-height:0;overflow:hidden;
    opacity:0;visibility:hidden;
    transition:max-height 320ms var(--ease),opacity 220ms var(--ease),visibility 220ms;
  }
  .site-header[data-open] .site-nav{
    max-height:78vh;overflow-y:auto;
    opacity:1;visibility:visible;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;padding:6px var(--pad) 20px}
  .nav-list li + li{border-top:1px solid rgba(168,198,195,.16)}
  .nav-list a{padding:15px 0;font-size:16.5px;width:100%}
  .nav-list a::after{bottom:10px}
  .nav-num{display:inline;font-size:10px}
  .header-cta{padding:8px 14px;font-size:12.5px;box-shadow:3px 3px 0 rgba(111,247,228,.3)}
  .footer-inner{grid-template-columns:1fr}
  .footer-nav{grid-template-columns:repeat(2,minmax(0,1fr))}
}

@media (max-width:860px){
  .grid--2,.grid--3,.grid--aside{grid-template-columns:1fr}
}

@media (max-width:600px){
  .display{font-size:clamp(32px,10.5vw,54px)}
  .section-title{font-size:clamp(23px,6.4vw,32px)}
  .footer-nav{grid-template-columns:1fr}
  .footer-legal{flex-direction:column;align-items:flex-start}
  .index-list{grid-template-columns:1fr}
}

/* ============================================================
   10. 动效降级
   ============================================================ */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto}
  *,*::before,*::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  .index-panel{animation:none}
  [data-reveal]{opacity:1;transform:none}
  .scroll-meter > span{transition:none}
}