/* ==========================================================================
   6688体育登录 · 共享样式 /assets/site.css
   视觉基调：赛场数据指挥中心 —— 深空蓝黑承重 + 荧光绿/亮橙数据高亮
   ========================================================================== */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --bg:#080D16;
  --panel:#0F1724;
  --line:#1B2637;
  --divider:#2E3A4D;
  --green:#3DFFA6;
  --orange:#FF7A2F;
  --purple:#7C5CFF;
  --cyan:#59E1FF;
  --gray:#9FB3C8;
  --white:#E8EEF5;

  --green-soft:rgba(61,255,166,.12);
  --green-line:rgba(61,255,166,.38);
  --orange-soft:rgba(255,122,47,.12);
  --orange-line:rgba(255,122,47,.38);
  --cyan-soft:rgba(89,225,255,.12);
  --cyan-line:rgba(89,225,255,.42);
  --purple-soft:rgba(124,92,255,.18);

  --font-sans:"Noto Sans SC","PingFang SC","Microsoft YaHei",system-ui,-apple-system,"Segoe UI",sans-serif;
  --font-mono:"JetBrains Mono","IBM Plex Mono",ui-monospace,SFMono-Regular,Menlo,Consolas,monospace;

  --gutter:24px;
  --content:1320px;
  --shell:1360px;
  --radius:20px;
  --radius-sm:14px;
  --pill:999px;
  --cut:26px;
  --header-h:78px;

  --s1:8px; --s2:16px; --s3:24px; --s4:32px; --s5:48px; --s6:72px; --s7:112px;

  --ease:cubic-bezier(.2,.7,.3,1);
}

/* ---------- 2. Reset 与基础 ---------- */
*,*::before,*::after{box-sizing:border-box}

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

body{
  margin:0;
  padding-top:var(--header-h);
  background:var(--bg);
  color:var(--white);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.7;
  overflow-x:hidden;
  -webkit-font-smoothing:antialiased;
}

/* 球场俯视网格：只在首屏区域可见，向下渐隐 */
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(to right, rgba(27,38,55,.65) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(27,38,55,.65) 1px, transparent 1px);
  background-size:72px 72px;
  -webkit-mask-image:radial-gradient(120% 68% at 50% 0%, #000 8%, transparent 72%);
  mask-image:radial-gradient(120% 68% at 50% 0%, #000 8%, transparent 72%);
  opacity:.55;
}

img{max-width:100%;display:block}
a{color:var(--cyan);text-decoration:none}
a:hover{color:var(--green)}

h1,h2,h3,h4{margin:0;font-weight:700;line-height:1.2;letter-spacing:-.01em}
h1{font-size:clamp(36px,6vw,64px);font-weight:900;line-height:1.05;letter-spacing:-.02em}
h2{font-size:clamp(28px,4vw,44px)}
h3{font-size:clamp(20px,2.4vw,26px)}
p{margin:0 0 1em}

button{font:inherit;color:inherit}

.nav-list,.chip-list,.footer-links,.contact-list,.timeline,.breadcrumb,.stat-list,.filter-chips{
  list-style:none;margin:0;padding:0;
}

:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:6px}

#main-content{display:block;position:relative;z-index:1;scroll-margin-top:96px}

.skip-link{
  position:fixed;
  top:10px;left:10px;
  z-index:200;
  transform:translateY(-180%);
  background:var(--green);
  color:#04120C;
  font-weight:700;
  font-size:15px;
  padding:12px 20px;
  border-radius:12px;
  transition:transform .18s var(--ease);
}
.skip-link:focus{transform:none;color:#04120C}

.num{font-family:var(--font-mono);font-variant-numeric:tabular-nums}

.annot{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.16em;
  color:var(--gray);
}
.annot--vertical{
  writing-mode:vertical-rl;
  text-orientation:mixed;
  letter-spacing:.3em;
  padding-block:8px;
}

.lead{font-size:clamp(17px,1.6vw,20px);color:var(--gray);max-width:64ch}

/* ---------- 3. 布局 ---------- */
.container{
  width:100%;
  max-width:var(--content);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.container--narrow{max-width:960px}

.section{padding-block:var(--s6)}
.section--tight{padding-block:var(--s4)}
.section--loose{padding-block:var(--s7)}
.section--band{
  background:linear-gradient(180deg,
    rgba(15,23,36,0) 0%,
    rgba(15,23,36,.82) 16%,
    rgba(15,23,36,.82) 84%,
    rgba(15,23,36,0) 100%);
}

.grid{display:grid;gap:var(--s3)}
.grid--12{grid-template-columns:repeat(12,minmax(0,1fr))}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}

.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-9{grid-column:span 9}
.span-12{grid-column:span 12}

.stack{display:flex;flex-direction:column;gap:var(--s3)}
.row{display:flex;flex-wrap:wrap;align-items:center;gap:12px}

/* ---------- 4. 头部 · 悬浮胶囊导航 ---------- */
.site-header{
  position:fixed;
  top:0;left:0;right:0;
  z-index:60;
  height:var(--header-h);
  display:flex;
  align-items:center;
  background:linear-gradient(180deg, rgba(8,13,22,.94), rgba(8,13,22,.62));
  -webkit-backdrop-filter:blur(14px);
  backdrop-filter:blur(14px);
  border-bottom:1px solid transparent;
  transition:height .26s var(--ease), background-color .26s var(--ease), border-color .26s var(--ease);
}
.site-header[data-condensed]{
  height:62px;
  background:rgba(8,13,22,.97);
  border-bottom-color:var(--line);
}
@media (min-width:1025px){
  .site-header::after{
    content:"";
    position:absolute;
    left:0;bottom:-1px;
    width:180px;height:1px;
    background:linear-gradient(90deg,var(--green),rgba(61,255,166,0));
  }
}

.scroll-progress{
  position:absolute;
  left:0;right:0;bottom:-1px;
  height:2px;
  transform:scaleX(0);
  transform-origin:0 50%;
  background:linear-gradient(90deg,var(--cyan) 0%,var(--green) 55%,var(--orange) 100%);
  z-index:2;
  pointer-events:none;
}

.header-inner{
  width:100%;
  max-width:var(--shell);
  height:100%;
  margin-inline:auto;
  padding-inline:24px;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:20px;
}

/* 品牌 */
.brand{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--white);
  text-decoration:none;
  flex:0 0 auto;
}
.brand:hover{color:var(--white)}
.brand-mark{
  position:relative;
  width:34px;height:34px;
  flex:0 0 auto;
  background:linear-gradient(140deg,var(--green),var(--cyan));
  clip-path:polygon(0 0,100% 0,100% 68%,68% 100%,0 100%);
}
.brand-mark::after{
  content:"";
  position:absolute;
  inset:8px;
  background:var(--bg);
  clip-path:polygon(0 0,100% 0,100% 62%,62% 100%,0 100%);
}
.brand-text{display:flex;flex-direction:column;line-height:1.15}
.brand-name{font-size:17px;font-weight:800;letter-spacing:-.01em}
.brand-sub{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.1em;
  color:var(--gray);
  margin-top:2px;
}
.site-header[data-condensed] .brand-sub{display:none}

/* 胶囊导航 */
.site-nav{
  display:flex;
  align-items:center;
  gap:14px;
  padding:6px 8px;
  border:1px solid var(--line);
  border-radius:var(--pill);
  background:rgba(15,23,36,.78);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-link{
  display:inline-flex;
  align-items:center;
  min-height:38px;
  padding:0 13px;
  border-radius:var(--pill);
  color:var(--gray);
  font-size:15px;
  font-weight:500;
  white-space:nowrap;
  transition:color .18s var(--ease), background-color .18s var(--ease), box-shadow .18s var(--ease);
}
.nav-link:hover{color:var(--white);background:var(--cyan-soft)}
.nav-link[aria-current="page"]{
  color:var(--green);
  background:var(--green-soft);
  box-shadow:inset 0 0 0 1px var(--green-line);
}

.nav-quick{display:none}
.nav-quick__title{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.2em;
  color:var(--gray);
}

/* 头部动作区 */
.header-actions{display:flex;align-items:center;gap:10px;flex:0 0 auto}
.header-cta{white-space:nowrap}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  min-height:44px;
  padding:0 16px;
  border:1px solid var(--line);
  border-radius:var(--pill);
  background:rgba(15,23,36,.85);
  color:var(--white);
  font-size:14px;
  cursor:pointer;
  transition:color .18s var(--ease), border-color .18s var(--ease);
}
.nav-toggle:hover{border-color:var(--cyan-line);color:var(--cyan)}
.nav-toggle__bars{position:relative;display:block;width:16px;height:10px}
.nav-toggle__bars::before,
.nav-toggle__bars::after{
  content:"";
  position:absolute;left:0;right:0;
  height:2px;border-radius:2px;
  background:currentColor;
  transition:transform .18s var(--ease);
}
.nav-toggle__bars::before{top:0}
.nav-toggle__bars::after{bottom:0}
.nav-toggle[aria-expanded="true"]{border-color:var(--cyan-line);color:var(--cyan)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::before{transform:translateY(4px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars::after{transform:translateY(-4px) rotate(-45deg)}

/* ---------- 5. 通用按钮 / 标签 / 胶囊碎片 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:44px;
  padding:10px 22px;
  border:1px solid transparent;
  border-radius:var(--pill);
  font-size:15px;
  font-weight:700;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s var(--ease), color .18s var(--ease),
             border-color .18s var(--ease), box-shadow .18s var(--ease);
}
.btn--sm{min-height:38px;padding:8px 17px;font-size:14px}

.btn--primary{background:var(--green);color:#04120C}
.btn--primary:hover{background:#6EFFC1;color:#04120C;box-shadow:0 0 0 4px var(--green-soft)}

.btn--ghost{background:rgba(15,23,36,.7);border-color:var(--line);color:var(--white)}
.btn--ghost:hover{border-color:var(--cyan-line);color:var(--cyan);background:var(--cyan-soft)}

.btn--accent{background:var(--orange);color:#1A0A02}
.btn--accent:hover{background:#FF9357;color:#1A0A02;box-shadow:0 0 0 4px var(--orange-soft)}

.chip{
  display:inline-flex;
  align-items:center;
  gap:6px;
  min-height:36px;
  padding:7px 15px;
  border:1px solid var(--line);
  border-radius:var(--pill);
  background:rgba(27,38,55,.5);
  color:var(--gray);
  font-size:14px;
  line-height:1;
  text-decoration:none;
  transition:color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}
.chip:hover{color:var(--cyan);border-color:var(--cyan-line);background:var(--cyan-soft)}
.chip.is-active,
.chip[aria-pressed="true"]{
  color:var(--orange);
  border-color:var(--orange-line);
  background:var(--orange-soft);
}

.chip-list{display:flex;flex-wrap:wrap;gap:8px}
.chip-list--footer{margin-top:var(--s3)}

.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border:1px solid var(--line);
  border-radius:8px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.08em;
  color:var(--gray);
  line-height:1.6;
}
.tag--live{color:var(--green);border-color:var(--green-line);background:var(--green-soft)}
.tag--fav{color:var(--orange);border-color:var(--orange-line);background:var(--orange-soft)}
.tag--info{color:var(--cyan);border-color:var(--cyan-line);background:var(--cyan-soft)}

/* ---------- 6. 面板 ---------- */
.panel{
  position:relative;
  background:linear-gradient(180deg, rgba(15,23,36,.94), rgba(10,16,27,.94));
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:var(--s3);
}

.panel--cut{
  position:relative;
  z-index:0;
  padding:var(--s3);
  border:0;
  border-radius:0;
  background:var(--line);
  clip-path:polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}
.panel--cut::before{
  content:"";
  position:absolute;
  inset:1px;
  z-index:-1;
  background:linear-gradient(158deg, var(--panel), #0A101B 78%);
  clip-path:polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
}
.panel--cut:hover{background:var(--cyan-line)}

.panel__head{
  display:flex;
  align-items:baseline;
  justify-content:space-between;
  gap:16px;
  margin-bottom:var(--s2);
}
.panel__title{margin:0;font-size:19px;font-weight:700}
.panel__meta{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--gray);
}

/* 斜纹轨道装饰 */
.track-lines{
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(104deg, rgba(27,38,55,.55) 0 1px, transparent 1px 78px);
  opacity:.55;
}

/* ---------- 7. 章节头 ---------- */
.section-head{
  display:flex;
  align-items:flex-end;
  justify-content:space-between;
  flex-wrap:wrap;
  gap:var(--s3);
  margin-bottom:var(--s4);
}
.section-index{
  display:block;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.2em;
  color:var(--purple);
  margin-bottom:10px;
}
.section-title{margin:0;font-size:clamp(28px,4vw,44px);line-height:1.12}
.section-desc{margin:12px 0 0;max-width:60ch;color:var(--gray);font-size:16px}

/* ---------- 8. 指标 ---------- */
.stat-list{display:flex;flex-wrap:wrap;gap:var(--s4)}
.stat{display:flex;flex-direction:column;gap:6px;min-width:120px}
.stat-value{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:clamp(32px,5vw,52px);
  font-weight:700;
  line-height:1;
  letter-spacing:-.02em;
  color:var(--white);
}
.stat-value--green{color:var(--green)}
.stat-value--orange{color:var(--orange)}
.stat-value--cyan{color:var(--cyan)}
.stat-label{font-size:13px;color:var(--gray)}

/* ---------- 9. 时间轴 ---------- */
.timeline{position:relative;padding-left:32px}
.timeline::before{
  content:"";
  position:absolute;
  left:7px;top:8px;bottom:8px;
  width:1px;
  background:var(--divider);
}
.timeline-item{position:relative;padding-bottom:var(--s4)}
.timeline-item:last-child{padding-bottom:0}
.timeline-node{
  position:absolute;
  left:-32px;top:6px;
  width:15px;height:15px;
  border-radius:50%;
  border:1px solid var(--divider);
  background:var(--bg);
  transition:background-color .24s var(--ease), box-shadow .24s var(--ease), border-color .24s var(--ease);
}
.timeline-item.is-on .timeline-node{
  background:var(--green);
  border-color:var(--green);
  box-shadow:0 0 0 5px var(--green-soft);
}
.timeline-time{
  font-family:var(--font-mono);
  font-variant-numeric:tabular-nums;
  font-size:13px;
  letter-spacing:.08em;
  color:var(--cyan);
}
.timeline-title{margin:4px 0 6px;font-size:18px;font-weight:700}
.timeline-body{margin:0;color:var(--gray);font-size:15px;max-width:62ch}

/* ---------- 10. 图片容器 ---------- */
.media-frame{
  position:relative;
  width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(158deg, var(--panel), #0A101B 80%);
}
.media-frame--wide{aspect-ratio:21 / 9}
.media-frame--tall{aspect-ratio:4 / 5}
.media-frame--square{aspect-ratio:1 / 1}
.media-frame img{
  width:100%;height:100%;
  object-fit:cover;
  position:relative;
  z-index:1;
}
.media-frame__grid{
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(to right, rgba(89,225,255,.14) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(89,225,255,.14) 1px, transparent 1px);
  background-size:56px 56px;
  opacity:.8;
  pointer-events:none;
}
.media-frame__lines{
  position:absolute;
  inset:0;
  background:repeating-linear-gradient(14deg, rgba(124,92,255,.2) 0 2px, transparent 2px 22px);
  pointer-events:none;
}
.media-frame__caption{
  position:absolute;
  left:16px;bottom:14px;
  z-index:2;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--white);
  background:rgba(8,13,22,.7);
  border:1px solid var(--line);
  border-radius:var(--pill);
  padding:5px 12px;
}

/* ---------- 11. 面包屑与正文 ---------- */
.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  margin-bottom:var(--s3);
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--gray);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:8px}
.breadcrumb li + li::before{content:"/";color:var(--divider)}
.breadcrumb a{color:var(--gray)}
.breadcrumb a:hover{color:var(--cyan)}

.prose{max-width:68ch}
.prose p{color:var(--gray);margin:0 0 1.1em}
.prose h2{margin:var(--s5) 0 var(--s2);font-size:clamp(24px,3vw,34px)}
.prose h3{margin:var(--s4) 0 12px;font-size:20px}
.prose ul,.prose ol{margin:0 0 1.1em;padding-left:1.3em;color:var(--gray)}
.prose ul{list-style:disc}
.prose ol{list-style:decimal}
.prose li{margin-bottom:6px}
.prose a{border-bottom:1px solid var(--cyan-line)}

/* ---------- 12. 筛选侧栏（业务 / 专题 / 答疑页常驻） ---------- */
.filter-rail{
  display:flex;
  flex-direction:column;
  gap:var(--s3);
  padding:var(--s3);
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:rgba(15,23,36,.75);
}
.filter-group__title{
  margin:0 0 10px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.18em;
  color:var(--gray);
}
.filter-chips{display:flex;flex-wrap:wrap;gap:8px}

/* ---------- 13. 章节索引链接（滚动监听） ---------- */
[data-spy-link]{
  color:var(--gray);
  text-decoration:none;
  transition:color .18s var(--ease);
}
[data-spy-link]:hover{color:var(--white)}
[data-spy-link][aria-current]{color:var(--green)}

/* ---------- 14. 页脚 ---------- */
.site-footer{
  position:relative;
  z-index:1;
  margin-top:var(--s7);
  padding:var(--s6) 0 var(--s4);
  border-top:1px solid var(--line);
  background:linear-gradient(180deg, rgba(8,13,22,0) 0%, rgba(15,23,36,.9) 22%, rgba(15,23,36,.96) 100%);
  color:var(--gray);
  overflow:hidden;
}
.site-footer::before{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background:repeating-linear-gradient(104deg, rgba(27,38,55,.5) 0 1px, transparent 1px 90px);
  opacity:.5;
}
.footer-track{
  position:absolute;
  top:0;left:0;right:0;
  height:2px;
  background:linear-gradient(90deg, transparent 0%, rgba(61,255,166,.6) 18%, rgba(89,225,255,.55) 50%, rgba(255,122,47,.6) 82%, transparent 100%);
}
.footer-inner{
  position:relative;
  display:grid;
  grid-template-columns:1.25fr 1.7fr 1.2fr;
  gap:var(--s5);
}
.footer-brand .brand{margin-bottom:var(--s3)}
.footer-tagline{margin:0;font-size:15px;color:var(--gray);max-width:34ch}
.footer-brand .brand-sub{display:block}

.footer-cols{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:var(--s4)}
.footer-col__title{
  position:relative;
  margin:0 0 var(--s2);
  padding-left:14px;
  font-size:14px;
  font-weight:700;
  letter-spacing:.06em;
  color:var(--white);
}
.footer-col__title::before{
  content:"";
  position:absolute;
  left:0;top:50%;
  width:6px;height:6px;
  margin-top:-3px;
  background:var(--green);
  transform:rotate(45deg);
}
.footer-links li{margin-bottom:8px}
.footer-links a{color:var(--gray);font-size:15px}
.footer-links a:hover{color:var(--cyan)}

.contact-list li{
  display:flex;
  flex-wrap:wrap;
  align-items:baseline;
  gap:10px;
  margin-bottom:8px;
  font-size:15px;
}
.contact-key{
  flex:0 0 auto;
  min-width:68px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.1em;
  color:var(--divider);
  color:#7C8DA3;
}
.contact-value{color:var(--gray);word-break:break-all}
.footer-note{margin:12px 0 0;font-size:13px;color:var(--gray);line-height:1.6}

.footer-base{
  position:relative;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 28px;
  margin-top:var(--s5);
  padding-top:var(--s3);
  border-top:1px solid var(--divider);
  font-size:13px;
}
.footer-base .footer-note{margin:0;flex:1 1 320px}
.footer-icp{
  margin:0;
  font-family:var(--font-mono);
  font-size:13px;
  color:var(--white);
  letter-spacing:.06em;
}
.footer-copy{margin:0;font-family:var(--font-mono);font-size:13px;color:var(--gray)}

/* ---------- 15. 滚动显现 ---------- */
.has-js [data-reveal]{
  opacity:0;
  transform:translateY(16px);
  transition:opacity .42s var(--ease), transform .42s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
  will-change:opacity,transform;
}
.has-js [data-reveal].is-visible{
  opacity:1;
  transform:none;
  will-change:auto;
}

/* ---------- 16. 平板与手机 ---------- */
@media (max-width:1100px){
  .footer-inner{grid-template-columns:1fr 1fr;gap:var(--s4)}
  .footer-contact{grid-column:1 / -1}
}

@media (max-width:1024px){
  :root{--header-h:64px}
  body{padding-top:64px}
  .site-header[data-condensed]{height:56px}
  .header-inner{padding-inline:16px;gap:12px}
  .brand-sub{display:none}
  .header-cta{display:none}
  .nav-toggle{display:inline-flex}

  .site-nav{
    position:fixed;
    top:74px;left:12px;right:12px;
    z-index:70;
    display:block;
    padding:14px;
    border-radius:22px;
    background:rgba(15,23,36,.98);
    box-shadow:0 26px 64px rgba(0,0,0,.6);
    max-height:calc(100vh - 100px);
    overflow-y:auto;
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .18s var(--ease), transform .18s var(--ease), visibility .18s linear;
  }
  .site-nav[data-open]{
    opacity:1;
    visibility:visible;
    transform:none;
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:2px}
  .nav-link{
    width:100%;
    min-height:48px;
    padding:0 14px;
    border-radius:14px;
    font-size:16px;
  }
  .nav-quick{
    display:block;
    margin-top:14px;
    padding-top:14px;
    border-top:1px solid var(--divider);
  }
}

@media (max-width:900px){
  .grid--12{grid-template-columns:repeat(4,minmax(0,1fr))}
  .grid--2,.grid--3{grid-template-columns:minmax(0,1fr)}
  .span-3,.span-4,.span-5,.span-6,.span-7,.span-8,.span-9,.span-12{grid-column:1 / -1}
  .section{padding-block:var(--s5)}
  .section--loose{padding-block:var(--s6)}
  .section-head{margin-bottom:var(--s3)}
  .site-footer{margin-top:var(--s6);padding-top:var(--s5)}
  .footer-inner,
  .footer-cols{grid-template-columns:minmax(0,1fr);gap:var(--s4)}
  .panel--cut{--cut:18px}
  .stat-list{gap:var(--s3)}
}

@media (max-width:600px){
  :root{--cut:16px;--radius:16px}
  .btn{width:auto}
  .header-actions{gap:8px}
  .stat-value{font-size:clamp(30px,9vw,42px)}
  .timeline{padding-left:26px}
  .timeline-node{left:-26px}
}

/* ---------- 17. 降低动态 ---------- */
@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 !important;
    transform:none !important;
  }
  .scroll-progress{display:none}
}