/* =========================================================
   三亿体育 · Site Kit 共享层  /assets/site.css
   夜间赛场指挥中心：蓝图网格 + 框景导航 + 珠宝色分区
   ========================================================= */

/* ---------- 1. 设计令牌 ---------- */
:root{
  --ink-900:#061A14;
  --ink-800:#0B2A21;
  --ink-700:#0E3529;
  --indigo:#1B1F3B;
  --wine:#3B1722;
  --cyan:#49F2D0;
  --orange:#FF7A1A;
  --sand:#C9A86A;
  --cool:#93A6A0;
  --ice:#EAF6F2;
  --ice-soft:#C7DCD5;
  --line:#24443C;
  --line-soft:rgba(36,68,60,.62);
  --line-strong:rgba(73,242,208,.42);

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

  --fs-12:12px; --fs-14:14px; --fs-16:16px; --fs-20:20px;
  --fs-28:28px; --fs-44:44px; --fs-72:72px; --fs-112:112px;

  --shell-max:1440px;
  --gutter:clamp(16px,3vw,40px);
  --radius:2px;
  --ease:cubic-bezier(.22,.61,.36,1);
}

/* ---------- 2. Reset ---------- */
*,*::before,*::after{box-sizing:border-box;}
html{-webkit-text-size-adjust:100%;scroll-behavior:smooth;}
body{margin:0;}
img,svg,picture,video{max-width:100%;}
button,input,select,textarea{font:inherit;color:inherit;}
table{border-collapse:collapse;width:100%;}
ul,ol{margin:0;padding:0;}

/* ---------- 3. 画布与中文排版 ---------- */
body{
  font-family:var(--font-body);
  font-size:var(--fs-16);
  font-weight:400;
  line-height:1.75;
  color:var(--ice);
  background-color:var(--ink-900);
  background-image:
    linear-gradient(rgba(36,68,60,.28) 1px,transparent 1px),
    linear-gradient(90deg,rgba(36,68,60,.28) 1px,transparent 1px),
    radial-gradient(1100px 620px at 84% -12%,rgba(73,242,208,.10),transparent 62%),
    radial-gradient(900px 560px at 2% 104%,rgba(255,122,26,.07),transparent 58%);
  background-size:72px 72px,72px 72px,100% 100%,100% 100%;
  background-attachment:fixed;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
  overflow-x:hidden;
}

h1,h2,h3,h4,h5,h6{
  font-family:var(--font-display);
  font-weight:800;
  line-height:1.1;
  letter-spacing:.01em;
  color:var(--ice);
  margin:0 0 .5em;
}
h1{font-size:clamp(40px,7vw,84px);}
h2{font-size:clamp(28px,4vw,44px);}
h3{font-size:clamp(20px,2.2vw,28px);}
h4{font-size:var(--fs-20);font-weight:600;}
p{margin:0 0 1.1em;}
p:last-child{margin-bottom:0;}
strong,b{font-weight:700;color:var(--ice);}
small{font-size:var(--fs-12);}
code,kbd,samp{font-family:var(--font-mono);font-size:.92em;color:var(--sand);}
a{color:var(--cyan);text-decoration:none;transition:color .18s var(--ease);}
a:hover{text-decoration:underline;text-underline-offset:3px;}
hr{border:0;}
::selection{background:rgba(73,242,208,.28);color:var(--ice);}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:1px;
}

.container{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.page-shell{padding-block:clamp(28px,4.5vw,68px);}

.visually-hidden{
  position:absolute!important;
  width:1px;height:1px;
  margin:-1px;padding:0;
  overflow:hidden;
  clip:rect(0 0 0 0);
  clip-path:inset(50%);
  white-space:nowrap;
  border:0;
}

/* ---------- 4. 跳至主要内容 ---------- */
.skip-link{
  position:fixed;
  top:12px;left:12px;
  z-index:200;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
  padding:10px 18px;
  background:var(--orange);
  color:#1A0C02;
  font-weight:700;
  font-size:var(--fs-14);
  border-radius:var(--radius);
  text-decoration:none;
}
.skip-link:focus,
.skip-link:focus-visible{transform:translateY(0);text-decoration:none;}

/* ---------- 5. 按钮 ---------- */
.btn{
  --btn-bg:transparent;
  --btn-fg:var(--ice);
  --btn-bd:var(--line-strong);
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  min-height:42px;
  padding:11px 18px;
  font-family:var(--font-body);
  font-size:var(--fs-14);
  font-weight:600;
  line-height:1;
  white-space:nowrap;
  color:var(--btn-fg);
  background:var(--btn-bg);
  border:1px solid var(--btn-bd);
  border-radius:var(--radius);
  text-decoration:none;
  cursor:pointer;
  transition:background .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}
.btn:hover{text-decoration:none;transform:translateY(-1px);}
.btn:active{transform:translateY(0);}
.btn--primary{--btn-bg:var(--orange);--btn-fg:#1A0C02;--btn-bd:var(--orange);font-weight:700;}
.btn--primary:hover{--btn-bg:#FF9040;--btn-bd:#FF9040;}
.btn--ghost{--btn-bg:rgba(73,242,208,.06);--btn-fg:var(--cyan);}
.btn--ghost:hover{--btn-bg:rgba(73,242,208,.15);}
.btn--quiet{
  --btn-fg:var(--cool);
  --btn-bd:var(--line);
  min-height:36px;
  padding:8px 13px;
  font-size:var(--fs-12);
  letter-spacing:.06em;
}
.btn--quiet:hover{--btn-fg:var(--ice);--btn-bd:var(--line-strong);}

/* ---------- 6. 状态灯 / 标签 / 芯片 ---------- */
.status-lamp{
  display:inline-block;
  width:7px;height:7px;
  flex:0 0 auto;
  border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(73,242,208,.16),0 0 10px rgba(73,242,208,.75);
}
.tag{
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:3px 9px;
  font-family:var(--font-mono);
  font-size:11px;
  line-height:1.6;
  letter-spacing:.1em;
  color:var(--cool);
  background:rgba(11,42,33,.65);
  border:1px solid var(--line);
  border-radius:999px;
  white-space:nowrap;
}
.tag--cyan{color:var(--cyan);border-color:rgba(73,242,208,.42);background:rgba(73,242,208,.08);}
.tag--orange{color:var(--orange);border-color:rgba(255,122,26,.44);background:rgba(255,122,26,.09);}
.tag--sand{color:var(--sand);border-color:rgba(201,168,106,.38);background:rgba(201,168,106,.07);}
.kicker{
  display:inline-block;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.22em;
  text-transform:uppercase;
  color:var(--sand);
}

/* ---------- 7. 头部：画框上沿 ---------- */
.scroll-meter{
  position:fixed;
  top:0;left:0;right:0;
  height:2px;
  z-index:120;
  pointer-events:none;
  background:rgba(36,68,60,.55);
}
.scroll-meter__bar{
  display:block;
  width:0;
  height:100%;
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  box-shadow:0 0 12px rgba(73,242,208,.6);
}

.site-header{
  position:sticky;
  top:0;
  z-index:110;
  background:linear-gradient(180deg,rgba(6,26,20,.98),rgba(6,26,20,.92));
  border-bottom:1px solid var(--line);
  box-shadow:0 1px 0 rgba(73,242,208,.12);
  transition:box-shadow .24s var(--ease);
}
.site-header[data-scrolled]{
  box-shadow:0 1px 0 rgba(73,242,208,.24),0 24px 52px -36px #000;
}
.header-frame{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.header-top{
  display:flex;
  align-items:center;
  gap:clamp(12px,2.2vw,32px);
  min-height:78px;
  transition:min-height .24s var(--ease);
}
.site-header[data-scrolled] .header-top{min-height:64px;}

.brand{
  display:inline-flex;
  align-items:center;
  gap:12px;
  flex:0 0 auto;
  color:var(--ice);
  text-decoration:none;
}
.brand:hover{text-decoration:none;}
.brand-mark{
  width:38px;height:38px;
  flex:0 0 auto;
  display:grid;
  place-items:center;
  border:1px solid rgba(73,242,208,.55);
  background:linear-gradient(160deg,rgba(73,242,208,.18),rgba(6,26,20,.1) 68%);
  position:relative;
}
.brand-mark::after{
  content:"";
  width:12px;height:12px;
  border:2px solid var(--cyan);
  transform:rotate(45deg);
  transition:transform .3s var(--ease);
}
.brand:hover .brand-mark::after{transform:rotate(135deg);}
.brand-text{display:block;min-width:0;}
.brand-name{
  display:block;
  font-family:var(--font-display);
  font-size:22px;
  font-weight:800;
  letter-spacing:.08em;
  line-height:1.05;
  color:var(--ice);
}
.brand-sub{
  display:block;
  margin-top:5px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--sand);
  white-space:nowrap;
}

.header-status{
  display:inline-flex;
  align-items:center;
  gap:9px;
  margin:0 0 0 auto;
  font-size:var(--fs-12);
  letter-spacing:.06em;
  color:var(--cool);
  white-space:nowrap;
}
.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}

/* 移动端抽屉按钮 */
.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  margin:0;
  padding:9px 13px;
  background:rgba(73,242,208,.06);
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  color:var(--cyan);
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.16em;
  line-height:1;
  cursor:pointer;
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.nav-toggle:hover{background:rgba(73,242,208,.14);}
.nav-toggle__bars{display:inline-flex;flex-direction:column;gap:3px;width:16px;}
.nav-toggle__bars > span{
  display:block;
  height:2px;
  background:currentColor;
  transition:transform .22s var(--ease),opacity .18s 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);}

/* ---------- 8. 导航：索引条 ---------- */
.site-nav{border-top:1px solid var(--line-soft);}
.nav-list{
  display:flex;
  flex-wrap:wrap;
  align-items:stretch;
  list-style:none;
  gap:2px;
}
.nav-item{display:flex;}
.nav-link{
  display:inline-flex;
  align-items:baseline;
  gap:8px;
  padding:13px 16px;
  font-size:var(--fs-14);
  font-weight:500;
  color:var(--cool);
  text-decoration:none;
  border-bottom:2px solid transparent;
  transition:color .18s var(--ease),background-color .18s var(--ease),border-color .18s var(--ease);
}
.nav-link:hover{color:var(--ice);background:rgba(73,242,208,.07);text-decoration:none;}
.nav-index{
  font-family:var(--font-mono);
  font-size:10px;
  letter-spacing:.1em;
  color:var(--sand);
  opacity:.85;
  transition:color .18s var(--ease);
}
.nav-link:hover .nav-index{color:var(--cyan);}
.nav-label{white-space:nowrap;}
.nav-link[aria-current="page"]{
  color:var(--cyan);
  border-bottom-color:var(--cyan);
  background:rgba(73,242,208,.06);
}
.nav-link[aria-current="page"] .nav-index{color:var(--orange);opacity:1;}

.nav-quick{display:none;}
.nav-quick__link{
  display:flex;
  align-items:center;
  justify-content:space-between;
  padding:12px 14px;
  font-size:var(--fs-14);
  font-weight:600;
  color:var(--cyan);
  text-decoration:none;
  background:rgba(73,242,208,.05);
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  transition:background .18s var(--ease);
}
.nav-quick__link:hover{background:rgba(73,242,208,.14);text-decoration:none;}
.nav-quick__link:last-child{color:var(--cool);background:transparent;border-color:var(--line);}
.nav-meta{display:none;}

.nav-scrim{
  display:none;
  position:fixed;
  inset:0;
  z-index:100;
  background:rgba(3,12,9,.74);
}
.nav-scrim[hidden]{display:none;}

/* ---------- 9. 页脚：归档落点 ---------- */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,104px);
  background:linear-gradient(180deg,#071D17 0%,#061A14 100%);
  border-top:1px solid var(--line);
}
.site-footer::before{
  content:"";
  position:absolute;
  top:0;left:0;right:0;
  height:1px;
  background:linear-gradient(90deg,transparent,rgba(73,242,208,.7),transparent);
  opacity:.5;
}
.footer-frame{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding:clamp(36px,5.5vw,72px) var(--gutter) 22px;
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr .7fr .8fr 1.35fr;
  gap:clamp(24px,3.4vw,56px);
  padding-bottom:clamp(28px,4vw,48px);
  border-bottom:1px solid var(--line-soft);
}
.footer-brand__name{
  font-family:var(--font-display);
  font-size:clamp(30px,4vw,44px);
  font-weight:800;
  letter-spacing:.06em;
  line-height:1;
  margin:0 0 14px;
  color:var(--ice);
}
.footer-brand__desc{
  margin:0 0 18px;
  max-width:34ch;
  font-size:var(--fs-14);
  line-height:1.8;
  color:var(--cool);
}
.footer-brand__stamp{
  display:inline-flex;
  align-items:center;
  gap:8px;
  margin:0;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--sand);
}
.footer-col{min-width:0;}
.footer-col__title{
  margin:0 0 14px;
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.2em;
  text-transform:uppercase;
  color:var(--sand);
}
.footer-links{list-style:none;display:flex;flex-direction:column;gap:9px;}
.footer-links a{
  display:inline-block;
  font-size:var(--fs-14);
  color:var(--cool);
  text-decoration:none;
  border-bottom:1px solid transparent;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.footer-links a:hover{color:var(--cyan);border-bottom-color:rgba(73,242,208,.5);text-decoration:none;}

.footer-contact{
  min-width:0;
  padding:18px 18px 10px;
  background:linear-gradient(165deg,rgba(11,42,33,.72),rgba(6,26,20,.55));
  border:1px solid rgba(73,242,208,.18);
  border-radius:var(--radius);
}
.footer-contact__row{
  display:grid;
  grid-template-columns:auto minmax(0,1fr) auto;
  align-items:center;
  gap:10px;
  padding:9px 0;
  border-bottom:1px dashed rgba(36,68,60,.85);
}
.footer-contact__row:last-child{border-bottom:0;}
.footer-contact__label{
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.14em;
  color:var(--sand);
}
.footer-contact__value{
  font-size:var(--fs-12);
  line-height:1.6;
  color:var(--ice-soft);
  overflow-wrap:anywhere;
}
.copy-btn{
  padding:4px 9px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  line-height:1.6;
  color:var(--cyan);
  background:rgba(73,242,208,.06);
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  cursor:pointer;
  transition:color .18s var(--ease),background .18s var(--ease),border-color .18s var(--ease);
}
.copy-btn:hover{background:rgba(73,242,208,.16);}
.copy-btn.is-copied{color:var(--orange);border-color:rgba(255,122,26,.55);background:rgba(255,122,26,.1);}

.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px 26px;
  padding-top:20px;
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--cool);
}
.footer-legal,
.footer-region,
.footer-copy{margin:0;}
.footer-legal{color:var(--ice-soft);}
.footer-copy{margin-inline-start:auto;}
.to-top{
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:8px 14px;
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.14em;
  color:var(--cyan);
  background:rgba(73,242,208,.06);
  border:1px solid var(--line-strong);
  border-radius:var(--radius);
  cursor:pointer;
  transition:background .18s var(--ease),border-color .18s var(--ease);
}
.to-top:hover{background:rgba(73,242,208,.16);border-color:var(--cyan);}

/* ---------- 10. 通用排版组件 ---------- */
.lede{
  max-width:62ch;
  font-size:clamp(16px,1.4vw,20px);
  line-height:1.72;
  color:var(--ice-soft);
}
.rule{
  height:1px;
  margin:clamp(22px,3.6vw,44px) 0;
  background:linear-gradient(90deg,var(--line),rgba(36,68,60,.18) 72%,transparent);
}
.section-head{
  display:flex;
  align-items:flex-end;
  gap:16px;
  padding-bottom:14px;
  margin-bottom:clamp(20px,2.6vw,32px);
  border-bottom:1px solid var(--line);
}
.section-head__index{
  font-family:var(--font-mono);
  font-size:var(--fs-12);
  letter-spacing:.18em;
  color:var(--orange);
  padding-bottom:6px;
  flex:0 0 auto;
}
.section-head__title{
  margin:0;
  font-family:var(--font-display);
  font-size:clamp(22px,3vw,34px);
  font-weight:800;
  line-height:1.1;
}
.breadcrumb{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.12em;
  color:var(--cool);
}
.breadcrumb ol{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:8px;
  list-style:none;
}
.breadcrumb a{color:var(--cool);text-decoration:none;}
.breadcrumb a:hover{color:var(--cyan);}
.breadcrumb__sep{color:var(--sand);opacity:.7;}
.breadcrumb [aria-current="page"]{color:var(--ice);}

/* ---------- 11. 面板 / 网格 / 数据 ---------- */
.panel{
  background:var(--ink-800);
  border:1px solid var(--line);
  border-radius:var(--radius);
  padding:clamp(18px,2.4vw,30px);
}
.panel--glass{
  background:linear-gradient(160deg,rgba(11,42,33,.8),rgba(6,26,20,.58));
  border:1px solid rgba(73,242,208,.18);
}
.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--8-4{grid-template-columns:minmax(0,2fr) minmax(0,1fr);}
.grid--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr);}

.stat{display:flex;flex-direction:column;gap:6px;}
.stat__value{
  font-family:var(--font-mono);
  font-weight:600;
  font-size:clamp(40px,7vw,72px);
  line-height:1;
  letter-spacing:-.02em;
  color:var(--cyan);
}
.stat__label{
  font-family:var(--font-mono);
  font-size:11px;
  letter-spacing:.18em;
  color:var(--sand);
}
.stat--accent .stat__value{color:var(--orange);}

.data-table{width:100%;font-size:var(--fs-14);}
.data-table th,
.data-table td{
  padding:10px 12px;
  text-align:left;
  vertical-align:top;
  border-bottom:1px solid rgba(36,68,60,.7);
}
.data-table th{
  font-family:var(--font-mono);
  font-size:11px;
  font-weight:500;
  letter-spacing:.14em;
  color:var(--sand);
  white-space:nowrap;
}
.data-table tbody tr{transition:background .18s var(--ease);}
.data-table tbody tr:hover{background:rgba(73,242,208,.05);}

/* ---------- 12. 图片容器基础规则 ---------- */
.media-frame{
  position:relative;
  display:block;
  width:100%;
  aspect-ratio:16 / 9;
  overflow:hidden;
  background:linear-gradient(150deg,var(--ink-800),var(--ink-900));
  border:1px solid var(--line);
  border-radius:var(--radius);
}
.media-frame > img,
.media-frame > picture,
.media-frame > picture > img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  filter:saturate(.82) brightness(.82) contrast(1.04);
}
.media-frame::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(36,68,60,.45) 1px,transparent 1px),
    linear-gradient(90deg,rgba(36,68,60,.45) 1px,transparent 1px);
  background-size:40px 40px;
  opacity:.55;
}
.media-frame--wide{aspect-ratio:21 / 9;}
.media-frame--square{aspect-ratio:1 / 1;}
.media-frame__caption{
  position:absolute;
  left:10px;
  bottom:10px;
  z-index:2;
  display:inline-flex;
  align-items:center;
  gap:6px;
  max-width:calc(100% - 20px);
  padding:4px 10px;
  font-family:var(--font-mono);
  font-size:10.5px;
  letter-spacing:.1em;
  color:var(--sand);
  background:rgba(6,26,20,.82);
  border:1px solid var(--line);
  border-radius:var(--radius);
}

/* ---------- 13. 显现动效协议 ---------- */
[data-reveal]{transition:opacity .34s var(--ease),transform .34s var(--ease);}
[data-reveal].is-reveal-ready{opacity:0;transform:translateY(12px);}
[data-reveal].is-revealed{opacity:1;transform:none;}

/* ---------- 14. 响应式 ---------- */
@media (max-width:1080px){
  .grid--3{grid-template-columns:repeat(2,minmax(0,1fr));}
  .grid--8-4,
  .grid--7-5{grid-template-columns:minmax(0,1fr);}
  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr));}
  .header-status{display:none;}
  .header-actions{margin-inline-start:auto;}
}

@media (max-width:900px){
  body{background-attachment:scroll;}

  .header-actions{display:none;}
  .nav-toggle{display:inline-flex;margin-inline-start:auto;}

  .site-nav{
    position:fixed;
    top:0;right:0;bottom:0;
    z-index:105;
    width:min(86vw,380px);
    padding:96px 22px 34px;
    overflow-y:auto;
    overscroll-behavior:contain;
    background:linear-gradient(180deg,#07211A 0%,#061A14 56%,#0B2A21 100%);
    border-top:0;
    border-left:1px solid var(--line);
    transform:translateX(101%);
    transition:transform .3s var(--ease);
    -webkit-overflow-scrolling:touch;
  }
  .site-header[data-open] .site-nav{transform:translateX(0);}

  .nav-list{flex-direction:column;gap:0;padding:0;}
  .nav-link{
    display:flex;
    justify-content:space-between;
    align-items:center;
    width:100%;
    padding:16px 12px;
    font-size:var(--fs-16);
    color:var(--ice-soft);
    border-bottom:1px solid rgba(36,68,60,.7);
    border-left:2px solid transparent;
    border-bottom-width:1px;
  }
  .nav-link:hover{background:rgba(73,242,208,.07);}
  .nav-link[aria-current="page"]{
    color:var(--cyan);
    border-bottom-color:rgba(36,68,60,.7);
    border-left-color:var(--cyan);
    background:rgba(73,242,208,.08);
  }
  .nav-index{font-size:11px;}

  .nav-quick{
    display:flex;
    flex-direction:column;
    gap:10px;
    margin-top:26px;
    padding-top:22px;
    border-top:1px solid var(--line);
  }
  .nav-meta{
    display:block;
    margin:20px 0 0;
    font-family:var(--font-mono);
    font-size:10.5px;
    letter-spacing:.14em;
    color:var(--sand);
    opacity:.8;
  }

  .nav-scrim{display:block;}
  .footer-copy{margin-inline-start:0;}
}

@media (max-width:760px){
  .grid--2,
  .grid--3{grid-template-columns:minmax(0,1fr);}
  .footer-grid{grid-template-columns:minmax(0,1fr);}
  .footer-base{flex-direction:column;align-items:flex-start;gap:8px;}
  .to-top{align-self:flex-start;margin-top:6px;}
  .footer-brand__desc{max-width:none;}
}

@media (max-width:640px){
  body{background-size:48px 48px,48px 48px,100% 100%,100% 100%;}
  .brand-sub{display:none;}
  .brand-mark{width:34px;height:34px;}
  .brand-name{font-size:20px;}
  .header-top{min-height:66px;}
  .footer-contact{padding:16px 14px 8px;}
  .section-head{flex-wrap:wrap;align-items:baseline;gap:10px;}
}

/* ---------- 15. 降低动效偏好 ---------- */
@media (prefers-reduced-motion:reduce){
  html{scroll-behavior:auto;}
  *,
  *::before,
  *::after{
    animation-duration:.001ms!important;
    animation-iteration-count:1!important;
    transition-duration:.001ms!important;
  }
  [data-reveal],
  [data-reveal].is-reveal-ready{
    opacity:1!important;
    transform:none!important;
  }
  .btn:hover{transform:none;}
  .brand:hover .brand-mark::after{transform:rotate(45deg);}
  .scroll-meter__bar{transition:none;}
}