/* ==========================================================================
   site.css · 齐发官网共享外壳 — 深夜信号控制台
   深空蓝底 / 信号青呼号 / 脉冲橙版本标记 / 非对称信号轴
   ========================================================================== */

/* ---------- 1. Token ---------- */
:root{
  --space-900:#070C18;
  --space-800:#0C1428;
  --space-700:#12203C;
  --space-600:#1B2E52;
  --steel-500:#3D5B8C;
  --steel-300:#8FA6C8;
  --paper-050:#E6EDF8;
  --signal-cyan:#38E0D0;
  --signal-deep:#0FA79B;
  --pulse-orange:#FF8A3D;

  --line:rgba(143,166,200,.18);
  --line-soft:rgba(143,166,200,.10);
  --line-cyan:rgba(56,224,208,.28);
  --line-warm:rgba(255,138,61,.32);

  --font-title:"PingFang SC","Hiragino Sans GB","Microsoft YaHei","Noto Sans CJK SC","Source Han Sans SC",sans-serif;
  --font-body:system-ui,-apple-system,"Segoe UI","PingFang SC","Hiragino Sans GB","Microsoft YaHei",sans-serif;
  --font-mono:ui-monospace,"SFMono-Regular",Menlo,Consolas,"Liberation Mono","Courier New",monospace;

  --maxw:1240px;
  --gutter:clamp(18px,4vw,40px);
  --radius-s:12px;
  --radius-m:16px;
  --radius-l:20px;
  --radius-pill:999px;
  --shadow-panel:0 30px 70px -48px rgba(0,0,0,.95);
  --shadow-nav:0 24px 50px -30px rgba(0,0,0,.95);
  --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,video{display:block;max-width:100%}
button{font:inherit;color:inherit;background:none;border:0}
h1,h2,h3,h4,h5,h6{margin:0 0 .6em}
p{margin:0}
ul,ol{margin:0}
a{color:var(--signal-cyan);text-decoration:none}
a:hover{color:var(--paper-050)}
table{border-collapse:collapse;width:100%}

/* ---------- 3. 中文排版与底色 ---------- */
body{
  background-color:var(--space-900);
  color:var(--paper-050);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.01em;
  min-height:100vh;
  -webkit-font-smoothing:antialiased;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(56,224,208,.055) 1px,transparent 1px),
    linear-gradient(90deg,rgba(56,224,208,.045) 1px,transparent 1px);
  background-size:72px 72px,72px 72px;
  opacity:.55;
}
body>*{position:relative;z-index:1}

h1,h2,h3,h4,h5,h6,.font-title{
  font-family:var(--font-title);
  font-weight:700;
  letter-spacing:.03em;
  line-height:1.28;
}
h1{font-size:clamp(32px,6vw,68px);letter-spacing:.04em}
h2{font-size:clamp(24px,3.2vw,32px)}
h3{font-size:clamp(19px,2.1vw,22px)}
h4{font-size:17px}

.num{
  font-family:var(--font-mono);
  font-feature-settings:"tnum" 1;
  letter-spacing:.06em;
  padding-inline:.12em;
  font-weight:600;
}
.num--cyan{color:var(--signal-cyan)}
.num--warm{color:var(--pulse-orange)}

.kicker{
  display:inline-flex;
  align-items:center;
  gap:8px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.14em;
  color:var(--signal-cyan);
  margin:0 0 14px;
}
.kicker::before{
  content:"";
  width:16px;
  height:1px;
  background:var(--signal-cyan);
  opacity:.8;
}
.lead{
  font-size:clamp(16px,1.5vw,18px);
  line-height:1.75;
  color:var(--steel-300);
  max-width:62ch;
}
.section-title{margin:0 0 .5em}
.muted{color:var(--steel-300)}

/* ---------- 4. 布局容器 ---------- */
.wrap{
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding-inline:var(--gutter);
}
.section{padding-block:clamp(56px,8vw,96px)}
.section--tight{padding-block:clamp(36px,5vw,56px)}

.signal-axis{
  display:grid;
  grid-template-columns:minmax(180px,3fr) minmax(0,7fr) minmax(150px,2fr);
  gap:clamp(24px,3.5vw,56px);
  align-items:start;
}
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,minmax(0,1fr));
  gap:clamp(16px,2.4vw,32px);
}
.col-3{grid-column:span 3}
.col-4{grid-column:span 4}
.col-5{grid-column:span 5}
.col-6{grid-column:span 6}
.col-7{grid-column:span 7}
.col-8{grid-column:span 8}
.col-12{grid-column:span 12}

.scan-divider{
  position:relative;
  height:1px;
  border:0;
  margin:0;
  background:linear-gradient(90deg,transparent,var(--line) 12%,var(--line-cyan) 50%,var(--line) 88%,transparent);
  overflow:hidden;
}
.scan-divider::after{
  content:"";
  position:absolute;
  top:0;
  left:-25%;
  width:25%;
  height:100%;
  background:linear-gradient(90deg,transparent,rgba(56,224,208,.9),transparent);
  animation:scan 16s linear infinite;
}
.scan-line{
  position:relative;
  height:1px;
  background:var(--space-600);
  overflow:hidden;
}
.scan-line::after{
  content:"";
  position:absolute;
  top:0;
  left:-30%;
  width:30%;
  height:100%;
  background:linear-gradient(90deg,transparent,var(--signal-cyan),transparent);
  animation:scan 14s linear infinite;
}
@keyframes scan{
  0%{left:-30%}
  100%{left:100%}
}

/* ---------- 5. 基础组件 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  justify-content:center;
  gap:8px;
  padding:11px 20px;
  border-radius:var(--radius-pill);
  border:1px solid transparent;
  font-size:14.5px;
  font-weight:600;
  letter-spacing:.02em;
  line-height:1.4;
  text-decoration:none;
  cursor:pointer;
  transition:background-color .18s var(--ease),color .18s var(--ease),
             border-color .18s var(--ease),transform .18s var(--ease);
}
.btn--primary{
  background:var(--pulse-orange);
  color:#1A0B02;
  box-shadow:0 14px 30px -20px rgba(255,138,61,.95);
}
.btn--primary:hover{background:#FFA163;color:#1A0B02}
.btn--ghost{
  border-color:var(--line-cyan);
  background:rgba(56,224,208,.07);
  color:var(--paper-050);
}
.btn--ghost:hover{background:rgba(56,224,208,.16);color:var(--paper-050)}
.btn--quiet{
  border-color:var(--line);
  color:var(--steel-300);
}
.btn--quiet:hover{border-color:var(--line-cyan);color:var(--signal-cyan)}
.btn:active{transform:translateY(1px)}

.chip{
  display:inline-flex;
  align-items:center;
  gap:7px;
  padding:4px 11px;
  border-radius:var(--radius-pill);
  border:1px solid var(--line);
  background:rgba(143,166,200,.06);
  color:var(--steel-300);
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  line-height:1.6;
}
.chip--ok{
  border-color:var(--line-cyan);
  background:rgba(56,224,208,.09);
  color:var(--signal-cyan);
}
.chip--ver{
  border-color:var(--line-warm);
  background:rgba(255,138,61,.09);
  color:var(--pulse-orange);
}

.panel{
  position:relative;
  padding:clamp(20px,3vw,32px);
  border:1px solid var(--line);
  border-radius:var(--radius-l);
  background:linear-gradient(165deg,var(--space-800),var(--space-900) 72%);
  box-shadow:var(--shadow-panel);
  overflow:hidden;
}
.panel::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(56,224,208,.05) 1px,transparent 1px);
  background-size:24px 24px;
  opacity:.6;
}
.panel--flat{background:var(--space-700);border-color:var(--line-soft);box-shadow:none}
.panel--warm{border-color:var(--line-warm)}
.panel--warm .panel__tag{color:var(--pulse-orange)}
.panel>*{position:relative;z-index:1}

.data-table{font-size:15px;text-align:left}
.data-table th{
  background:var(--space-600);
  color:var(--paper-050);
  font-family:var(--font-title);
  font-size:14px;
  font-weight:600;
  letter-spacing:.03em;
  padding:11px 14px;
}
.data-table td{
  padding:12px 14px;
  border-bottom:1px solid var(--line-soft);
  color:#CFDBEE;
  vertical-align:top;
}
.data-table tbody tr:hover{background:rgba(56,224,208,.045)}
.data-table caption{
  caption-side:top;
  text-align:left;
  padding-bottom:10px;
  color:var(--steel-300);
  font-size:13.5px;
}

.breadcrumb{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  gap:10px;
  padding:0;
  margin:0 0 24px;
  list-style:none;
  font-family:var(--font-mono);
  font-size:13px;
  letter-spacing:.06em;
  color:var(--steel-300);
}
.breadcrumb li{display:inline-flex;align-items:center;gap:10px}
.breadcrumb li+li::before{content:"›";color:var(--steel-500)}
.breadcrumb a{color:var(--steel-300)}
.breadcrumb a:hover{color:var(--signal-cyan)}
.breadcrumb [aria-current="page"]{color:var(--paper-050)}

.prose{max-width:68ch;font-size:17px;color:#D7E2F2}
.prose p{margin:0 0 1.15em}
.prose h2{margin-top:1.9em}
.prose h3{margin-top:1.5em}
.prose ul,.prose ol{padding-left:1.2em;margin:0 0 1.2em}
.prose li{margin-bottom:.4em}
.prose strong{color:var(--paper-050)}
.prose a{border-bottom:1px solid var(--line-cyan)}

.media-frame{
  position:relative;
  display:block;
  width:100%;
  margin:0;
  aspect-ratio:16/9;
  border:1px solid var(--line);
  border-radius:var(--radius-m);
  background:linear-gradient(160deg,var(--space-800),var(--space-900));
  overflow:hidden;
}
.media-frame::before{
  content:"";
  position:absolute;
  inset:0;
  background-image:
    linear-gradient(rgba(56,224,208,.10) 1px,transparent 1px),
    linear-gradient(90deg,rgba(56,224,208,.08) 1px,transparent 1px);
  background-size:32px 32px,32px 32px;
  opacity:.6;
}
.media-frame::after{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:0;
  height:2px;
  background:linear-gradient(90deg,transparent,rgba(56,224,208,.75),transparent);
  animation:scan-y 15s linear infinite;
}
@keyframes scan-y{
  0%{top:0}
  100%{top:100%}
}
.media-frame img,
.media-frame svg{
  position:relative;
  z-index:1;
  width:100%;
  height:100%;
  object-fit:cover;
}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:4/5}
.media-frame--square{aspect-ratio:1/1}
.media-frame__cap{
  position:relative;
  z-index:1;
  margin-top:10px;
  font-size:13px;
  color:var(--steel-300);
}

.section-tracker{
  position:sticky;
  top:132px;
  font-size:14px;
}
.section-tracker__title{
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.12em;
  color:var(--steel-500);
  margin:0 0 12px;
}
.section-tracker ol{list-style:none;padding:0;border-left:1px solid var(--line)}
.section-tracker a{
  display:block;
  padding:7px 0 7px 14px;
  margin-left:-1px;
  border-left:2px solid transparent;
  color:var(--steel-300);
  font-size:14px;
  transition:color .18s var(--ease),border-color .18s var(--ease);
}
.section-tracker a:hover{color:var(--paper-050)}
.section-tracker a.is-active{
  color:var(--signal-cyan);
  border-left-color:var(--signal-cyan);
}

html.js [data-reveal]{
  opacity:0;
  transform:translateY(14px);
  transition:opacity .5s var(--ease),transform .5s var(--ease);
}
html.js [data-reveal].is-visible{opacity:1;transform:none}

.pulse-dot{
  display:inline-block;
  width:8px;
  height:8px;
  border-radius:50%;
  background:var(--signal-cyan);
  box-shadow:0 0 0 3px rgba(56,224,208,.14),0 0 14px rgba(56,224,208,.75);
  animation:pulse 5s ease-in-out infinite;
  flex:0 0 auto;
}
@keyframes pulse{
  0%,100%{opacity:.55;transform:scale(.9)}
  50%{opacity:1;transform:scale(1.08)}
}

/* ---------- 6. 头部 ---------- */
.site-header{
  position:sticky;
  top:0;
  z-index:50;
}

.skip-link{
  position:absolute;
  left:var(--gutter);
  top:-70px;
  z-index:90;
  padding:10px 18px;
  border-radius:0 0 12px 12px;
  background:var(--pulse-orange);
  color:#1A0B02;
  font-size:14px;
  font-weight:600;
  transition:top .18s var(--ease);
}
.skip-link:focus{top:0;color:#1A0B02}

.signal-strip{
  background:
    linear-gradient(90deg,rgba(56,224,208,.12),rgba(7,12,24,0) 58%),
    var(--space-800);
  border-bottom:1px solid var(--line-cyan);
}
.signal-strip__inner{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:18px;
  min-height:34px;
  padding-block:5px;
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--steel-300);
}
.signal-call{
  display:inline-flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.signal-call__id{color:var(--paper-050)}
.signal-call__state{color:var(--signal-cyan)}
.signal-meta{
  display:inline-flex;
  align-items:center;
  gap:18px;
  flex-wrap:wrap;
  justify-content:flex-end;
}
.signal-meta__item{white-space:nowrap}
.signal-meta__item--ok{color:var(--signal-cyan)}

.header-float{
  padding:10px var(--gutter) 12px;
  background:linear-gradient(180deg,rgba(7,12,24,.92) 40%,rgba(7,12,24,0));
}
.header-float__inner{
  position:relative;
  display:flex;
  align-items:center;
  gap:clamp(12px,2vw,26px);
  width:100%;
  max-width:var(--maxw);
  margin-inline:auto;
  padding:10px 12px 10px 18px;
  border:1px solid var(--line);
  border-radius:var(--radius-pill);
  background:rgba(12,20,40,.86);
  backdrop-filter:blur(14px);
  -webkit-backdrop-filter:blur(14px);
  box-shadow:var(--shadow-nav);
  transition:border-color .22s var(--ease),background-color .22s var(--ease),
             padding .22s var(--ease);
}
.site-header[data-scrolled] .header-float__inner{
  padding-block:6px;
  border-color:var(--line-cyan);
  background:rgba(9,16,32,.95);
}

.brand{
  display:inline-flex;
  align-items:center;
  gap:11px;
  flex:0 0 auto;
  color:var(--paper-050);
}
.brand:hover{color:var(--paper-050)}
.brand__mark{
  position:relative;
  width:30px;
  height:30px;
  border-radius:10px;
  background:radial-gradient(circle at 32% 28%,var(--signal-cyan),var(--signal-deep) 58%,var(--space-600));
  box-shadow:0 0 0 1px rgba(56,224,208,.42),0 0 22px -6px rgba(56,224,208,.8);
  flex:0 0 auto;
}
.brand__mark::after{
  content:"";
  position:absolute;
  inset:9px 5px;
  border-radius:2px;
  background:repeating-linear-gradient(90deg,var(--space-900) 0 2px,transparent 2px 4px);
  opacity:.55;
}
.brand__text{display:flex;flex-direction:column;line-height:1.2}
.brand__name{
  font-family:var(--font-title);
  font-size:16px;
  font-weight:700;
  letter-spacing:.04em;
}
.brand__sub{
  font-family:var(--font-mono);
  font-size:11.5px;
  letter-spacing:.06em;
  color:var(--steel-300);
}

.channel-nav{flex:1 1 auto;display:flex;justify-content:center}
.channel-list{
  display:flex;
  align-items:center;
  gap:2px;
  padding:0;
  list-style:none;
}
.channel-link{
  position:relative;
  display:inline-block;
  padding:8px 12px;
  border-radius:var(--radius-pill);
  color:var(--steel-300);
  font-size:14.5px;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.channel-link:hover{color:var(--paper-050);background:rgba(56,224,208,.08)}
.channel-link::after{
  content:"";
  position:absolute;
  left:50%;
  bottom:3px;
  width:0;
  height:2px;
  border-radius:2px;
  background:var(--signal-cyan);
  transform:translateX(-50%);
  transition:width .2s var(--ease);
}
.channel-link[aria-current="page"]{color:var(--paper-050)}
.channel-link[aria-current="page"]::after{width:18px}
.channel-link[aria-current="page"]::before{
  content:"";
  position:absolute;
  left:50%;
  bottom:-3px;
  width:4px;
  height:4px;
  border-radius:50%;
  background:var(--signal-cyan);
  transform:translateX(-50%);
}

.channel-nav__tail{display:none}
.tail-link{
  display:block;
  padding:12px 14px;
  border-radius:var(--radius-s);
  color:var(--steel-300);
  font-size:15px;
}
.tail-link:hover{color:var(--signal-cyan);background:rgba(56,224,208,.07)}
.tail-cta{margin-top:10px;width:100%}

.header-actions{
  display:flex;
  align-items:center;
  gap:10px;
  flex:0 0 auto;
}
.util-link{
  padding:6px 8px;
  border-radius:8px;
  color:var(--steel-300);
  font-size:13.5px;
  letter-spacing:.02em;
  white-space:nowrap;
  transition:color .18s var(--ease),background-color .18s var(--ease);
}
.util-link:hover{color:var(--signal-cyan);background:rgba(56,224,208,.08)}
.header-cta{padding:9px 16px;font-size:13.5px;white-space:nowrap}

.nav-toggle{
  display:none;
  align-items:center;
  gap:9px;
  padding:9px 14px;
  border:1px solid var(--line-cyan);
  border-radius:var(--radius-pill);
  background:rgba(56,224,208,.07);
  color:var(--paper-050);
  font-size:13.5px;
  cursor:pointer;
}
.nav-toggle__bars{display:flex;flex-direction:column;gap:3px;width:16px}
.nav-toggle__bars i{display:block;height:2px;border-radius:2px;background:var(--signal-cyan);transition:transform .2s var(--ease),opacity .2s var(--ease)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(1){transform:translateY(5px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(2){opacity:0}
.nav-toggle[aria-expanded="true"] .nav-toggle__bars i:nth-child(3){transform:translateY(-5px) rotate(-45deg)}

.scroll-meter{
  position:absolute;
  left:16%;
  right:16%;
  bottom:4px;
  height:2px;
  border-radius:2px;
  background:rgba(143,166,200,.18);
  overflow:hidden;
  pointer-events:none;
}
.scroll-meter__fill{
  display:block;
  width:100%;
  height:100%;
  background:linear-gradient(90deg,var(--signal-deep),var(--signal-cyan));
  transform:scaleX(0);
  transform-origin:0 50%;
  transition:transform .12s linear;
}
@keyframes nav-drop{
  from{opacity:0;transform:translateY(-6px)}
  to{opacity:1;transform:none}
}

/* ---------- 7. 页脚 ---------- */
.site-footer{
  margin-top:clamp(48px,7vw,96px);
  background:linear-gradient(180deg,var(--space-900),var(--space-800));
  color:var(--steel-300);
  font-size:14.5px;
}
.footer-top{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:14px;
  padding-block:22px;
}
.footer-call{
  display:inline-flex;
  align-items:center;
  gap:10px;
  color:var(--paper-050);
  font-family:var(--font-title);
  letter-spacing:.03em;
}
.footer-call__meta{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--steel-300);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr 1fr 1fr 1.7fr;
  gap:clamp(24px,3.6vw,56px);
  padding-block:clamp(32px,5vw,56px);
  border-top:1px solid var(--line-soft);
}
.footer-brand__name{
  font-family:var(--font-title);
  font-size:18px;
  font-weight:700;
  letter-spacing:.04em;
  color:var(--paper-050);
  margin-bottom:8px;
}
.footer-brand__line{color:var(--steel-300);font-size:13.5px;margin-bottom:6px}
.footer-brand__region{
  font-family:var(--font-mono);
  font-size:12.5px;
  letter-spacing:.06em;
  color:var(--signal-cyan);
  margin-bottom:14px;
}
.footer-brand__link{
  display:inline-block;
  font-size:13.5px;
  color:var(--paper-050);
  border-bottom:1px solid var(--line-cyan);
}
.footer-brand__link:hover{color:var(--signal-cyan)}
.footer-col__title{
  font-family:var(--font-mono);
  font-size:12px;
  font-weight:600;
  letter-spacing:.12em;
  color:var(--steel-500);
  margin:0 0 14px;
}
.footer-list{list-style:none;padding:0;display:grid;gap:8px}
.footer-list a{color:var(--steel-300);font-size:14px}
.footer-list a:hover{color:var(--signal-cyan)}
.contact-list{list-style:none;padding:0;display:grid;gap:10px}
.contact-list__item{display:flex;gap:10px;align-items:flex-start;font-size:14px}
.contact-list__key{
  flex:0 0 42px;
  font-family:var(--font-mono);
  font-size:12px;
  letter-spacing:.06em;
  color:var(--steel-500);
  padding-top:2px;
}
.contact-list__val{color:#CFDBEE;word-break:break-word}
.footer-note{
  margin-top:14px;
  padding-left:12px;
  border-left:2px solid var(--line-warm);
  font-size:13px;
  color:var(--steel-300);
}
.footer-base{
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:12px 24px;
  padding-block:20px 26px;
  border-top:1px solid var(--line-soft);
  font-size:13px;
}
.footer-base__filing{
  font-family:var(--font-mono);
  letter-spacing:.06em;
  color:var(--steel-300);
}
.footer-base__copy{color:var(--steel-500);max-width:60ch}
.footer-base__right{color:var(--steel-300)}

.to-top{
  position:fixed;
  right:clamp(16px,3vw,32px);
  bottom:clamp(16px,3vw,32px);
  z-index:60;
  display:inline-flex;
  align-items:center;
  gap:8px;
  padding:11px 18px;
  border:1px solid var(--line-cyan);
  border-radius:var(--radius-pill);
  background:rgba(12,20,40,.92);
  backdrop-filter:blur(10px);
  -webkit-backdrop-filter:blur(10px);
  color:var(--signal-cyan);
  font-size:13.5px;
  cursor:pointer;
  opacity:0;
  visibility:hidden;
  transform:translateY(10px);
  transition:opacity .22s var(--ease),transform .22s var(--ease),
             visibility .22s var(--ease),background-color .18s var(--ease);
  box-shadow:var(--shadow-nav);
}
.to-top[data-visible]{opacity:1;visibility:visible;transform:none}
.to-top:hover{background:rgba(56,224,208,.14);color:var(--paper-050)}
.to-top__arrow{font-family:var(--font-mono);line-height:1}

/* ---------- 8. 焦点与可达性 ---------- */
:focus-visible{
  outline:2px solid var(--signal-cyan);
  outline-offset:3px;
  border-radius:6px;
}

/* ---------- 9. 响应式 ---------- */
@media (max-width:1080px){
  .signal-axis{grid-template-columns:minmax(0,1fr)}
  .section-tracker{position:static;top:auto}
  .section-tracker ol{display:flex;flex-wrap:wrap;gap:4px;border-left:0}
  .section-tracker a{border-left:0;border-bottom:2px solid transparent;padding:6px 10px;margin-left:0}
  .section-tracker a.is-active{border-left:0;border-bottom-color:var(--signal-cyan)}
}

@media (max-width:900px){
  .grid-12{grid-template-columns:repeat(6,minmax(0,1fr))}
  .col-3,.col-4,.col-5{grid-column:span 3}
  .col-6,.col-7,.col-8{grid-column:span 6}

  .signal-strip__inner{font-size:12px}
  .brand__sub{display:none}

  .channel-nav{display:none;order:10}
  .channel-nav[data-open]{
    display:block;
    position:absolute;
    left:0;
    right:0;
    top:calc(100% + 10px);
    padding:12px;
    border:1px solid var(--line-cyan);
    border-radius:var(--radius-l);
    background:rgba(9,16,32,.98);
    box-shadow:var(--shadow-panel);
    animation:nav-drop .2s var(--ease);
  }
  .channel-list{display:flex;flex-direction:column;align-items:stretch;gap:2px}
  .channel-link{
    padding:12px 14px;
    border-radius:var(--radius-s);
    border-left:2px solid transparent;
    font-size:15px;
  }
  .channel-link::after,
  .channel-link[aria-current="page"]::before{display:none}
  .channel-link[aria-current="page"]{
    background:rgba(56,224,208,.10);
    border-left-color:var(--signal-cyan);
  }
  .channel-nav__tail{display:block;margin-top:10px;padding-top:10px;border-top:1px solid var(--line-soft)}

  .header-actions .util-link,
  .header-cta{display:none}
  .nav-toggle{display:inline-flex}

  .footer-grid{grid-template-columns:1fr 1fr;gap:32px}
  .footer-brand{grid-column:1/-1}
  .footer-col--contact{grid-column:1/-1}
}

@media (max-width:640px){
  body{font-size:16px}
  .grid-12{grid-template-columns:repeat(2,minmax(0,1fr))}
  .col-3,.col-4,.col-5,.col-6,.col-7,.col-8{grid-column:span 2}

  .signal-call__state{display:none}
  .signal-meta__item{display:none}
  .signal-meta__item:first-child{display:inline}
  .brand__name{font-size:15px}
  .header-float{padding-inline:12px}
  .header-float__inner{padding:8px 10px 8px 14px}
  .scroll-meter{left:24%;right:24%}

  .footer-grid{grid-template-columns:1fr}
  .footer-base{flex-direction:column;align-items:flex-start}
  .to-top{padding:10px 14px}
  .to-top__label{display:none}
}

/* ---------- 10. 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;
  }
  .pulse-dot{animation:none;opacity:1;transform:none}
  .scan-divider::after,
  .scan-line::after,
  .media-frame::after{display:none}
  html.js [data-reveal]{opacity:1;transform:none}
}