:root{
  --ink-900:#0A1220;
  --ink-800:#101B2E;
  --ink-700:#1B283C;
  --paper:#EDE9DF;
  --paper-dim:#CFCBC1;
  --cyan:#00E5C9;
  --orange:#FF6A2B;
  --turf:#3FA34D;
  --clay:#C7A17A;
  --moss:#7C8B6B;
  --mist:#9AA7B8;

  --rail-w:96px;
  --shell-max:1320px;
  --line:rgba(154,167,184,.16);
  --line-accent:rgba(0,229,201,.35);

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

  --ease:cubic-bezier(.22,.68,.2,1);
  --radius:10px;
  --radius-sm:8px;
  --radius-pill:999px;
  --scroll-ratio:0;
}

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

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

body{
  margin:0;
  padding-left:var(--rail-w);
  min-height:100vh;
  background-color:var(--ink-900);
  background-image:
    radial-gradient(120% 70% at 92% -8%, rgba(0,229,201,.13), transparent 58%),
    radial-gradient(90% 55% at 4% 104%, rgba(255,106,43,.09), transparent 60%),
    linear-gradient(180deg,#0A1220,#0B1424 60%,#0A1220);
  background-attachment:fixed;
  color:var(--paper);
  font-family:var(--font-sans);
  font-size:16px;
  font-weight:400;
  line-height:1.75;
  letter-spacing:.01em;
  -webkit-font-smoothing:antialiased;
}

h1,h2,h3,h4,h5,h6{margin:0;font-weight:800;line-height:1.2;}
p{margin:0;}
ul,ol{margin:0;padding:0;}
img,svg,video{max-width:100%;}
img{height:auto;}
a{color:inherit;}
button{font:inherit;color:inherit;background:none;border:0;}
dl,dd,dt{margin:0;}
figure{margin:0;}
[hidden]{display:none !important;}

:focus-visible{
  outline:2px solid var(--cyan);
  outline-offset:3px;
  border-radius:4px;
}

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

#main-content{display:block;scroll-margin-top:96px;}

/* ---------- 跳转链接 ---------- */
.skip-link{
  position:absolute;
  left:.6rem;
  top:.6rem;
  z-index:200;
  padding:.6rem 1rem;
  border-radius:var(--radius-sm);
  background:var(--cyan);
  color:#04121A;
  font:500 13px/1 var(--font-mono);
  letter-spacing:.08em;
  text-decoration:none;
  transform:translateY(-180%);
  transition:transform .2s var(--ease);
}
.skip-link:focus{
  transform:translateY(0);
}

/* ---------- 页头外壳 ---------- */
.site-header{
  position:relative;
  z-index:60;
}

/* 品牌轨道 */
.brand-rail{
  position:fixed;
  left:0;
  top:0;
  bottom:0;
  width:var(--rail-w);
  z-index:70;
  display:flex;
  flex-direction:column;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  padding:1.4rem .6rem 1.6rem;
  background:linear-gradient(180deg,#0C1627 0%,#0A1220 55%,#0C1524 100%);
  border-right:1px solid var(--line);
}

.brand-mark{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.55rem;
  color:var(--paper);
  text-decoration:none;
}
.brand-glyph{
  display:grid;
  place-items:center;
  width:46px;
  height:46px;
  border-radius:9px;
  background:var(--cyan);
  color:#04121A;
  font:900 26px/1 var(--font-sans);
  box-shadow:0 0 0 1px rgba(0,229,201,.4), 0 10px 24px -14px rgba(0,229,201,.9);
  transition:box-shadow .2s var(--ease);
}
.brand-word{
  writing-mode:vertical-rl;
  font:700 13px/1 var(--font-sans);
  letter-spacing:.3em;
  color:var(--paper);
  transition:color .2s var(--ease);
}
.brand-mark:hover .brand-glyph{box-shadow:0 0 0 3px rgba(0,229,201,.22), 0 10px 24px -12px rgba(0,229,201,.95);}
.brand-mark:hover .brand-word{color:var(--cyan);}

.rail-domain{
  writing-mode:vertical-rl;
  font:500 10px/1 var(--font-mono);
  letter-spacing:.14em;
  color:var(--mist);
}
.rail-domain__full{display:none;}
.rail-domain__short{display:inline;}

.rail-version{
  writing-mode:vertical-rl;
  font:500 11px/1 var(--font-mono);
  letter-spacing:.12em;
  color:var(--clay);
}
.rail-version__key{color:var(--mist);}

.rail-links{
  display:flex;
  flex-direction:column;
  gap:.5rem;
  width:100%;
}
.rail-link{
  display:block;
  padding:.6rem .3rem;
  border:1px solid var(--line);
  border-radius:var(--radius-sm);
  color:var(--paper);
  text-decoration:none;
  text-align:center;
  font:600 12px/1.2 var(--font-sans);
  letter-spacing:.06em;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.rail-link:hover{color:var(--cyan);border-color:var(--line-accent);}
.rail-link--accent{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#04121A;
  font-weight:700;
}
.rail-link--accent:hover{background:#5CFBE6;border-color:#5CFBE6;color:#04121A;}

.rail-meter{
  display:flex;
  flex-direction:column;
  align-items:center;
  gap:.35rem;
  width:100%;
}
.rail-meter__tick{
  display:block;
  width:100%;
  height:1px;
  background:linear-gradient(90deg,rgba(0,229,201,0),rgba(0,229,201,.65),rgba(0,229,201,0));
}
.rail-meter__tick:nth-child(2){opacity:.55;}
.rail-meter__tick:nth-child(3){opacity:.28;}

.rail-note{
  display:none;
  font:500 10px/1.4 var(--font-mono);
  letter-spacing:.2em;
  color:var(--moss);
}

/* 顶栏 */
.header-bar{
  position:sticky;
  top:0;
  z-index:50;
  background:rgba(10,18,32,.9);
  -webkit-backdrop-filter:blur(10px);
  backdrop-filter:blur(10px);
  border-bottom:1px solid var(--line);
}
.header-bar__inner{
  max-width:var(--shell-max);
  margin:0 auto;
  padding:.65rem 2rem;
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1.5rem;
}
.header-tagline{
  font:500 11px/1 var(--font-mono);
  letter-spacing:.2em;
  color:var(--cyan);
  text-transform:uppercase;
  white-space:nowrap;
}
.header-tagline::before{
  content:"—";
  margin-right:.5em;
  color:var(--orange);
}

.scroll-progress{
  position:absolute;
  left:0;
  bottom:-1px;
  height:2px;
  width:calc(var(--scroll-ratio,0) * 100%);
  background:linear-gradient(90deg,var(--cyan),var(--orange));
  transition:width .12s linear;
}

.nav-toggle{
  display:none;
  align-items:center;
  gap:.5rem;
  padding:.5rem .8rem;
  border:1px solid var(--line-accent);
  border-radius:var(--radius-sm);
  background:rgba(0,229,201,.08);
  color:var(--cyan);
  cursor:pointer;
  font:500 12px/1 var(--font-mono);
  letter-spacing:.1em;
}
.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:1.5px;
  background:currentColor;
  transition:transform .2s var(--ease);
}
.nav-toggle__bars::before{top:0;}
.nav-toggle__bars::after{bottom:0;}
.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);}
.nav-toggle__text{font-family:var(--font-sans);font-weight:600;letter-spacing:.08em;}

.site-nav{display:block;}
.site-nav__list{
  display:flex;
  align-items:center;
  flex-wrap:wrap;
  gap:.2rem;
  list-style:none;
}
.site-nav__item{margin:0;}
.site-nav a{
  display:block;
  padding:.5rem .85rem;
  border:1px solid transparent;
  border-radius:var(--radius-pill);
  color:var(--paper);
  text-decoration:none;
  font-size:14px;
  font-weight:500;
  letter-spacing:.03em;
  transition:color .18s var(--ease),border-color .18s var(--ease),background-color .18s var(--ease);
}
.site-nav a:hover{
  color:var(--cyan);
  border-color:var(--line-accent);
  background:rgba(0,229,201,.08);
}
.site-nav a[aria-current="page"]{
  color:#04121A;
  background:var(--cyan);
  border-color:var(--cyan);
  font-weight:700;
}

/* 移动端底部快捷条 */
.dock-cta{display:none;}

/* 返回顶部 */
.to-top{
  position:fixed;
  right:1.2rem;
  bottom:1.2rem;
  z-index:95;
  display:inline-flex;
  align-items:center;
  gap:.45rem;
  padding:.6rem .85rem;
  border:1px solid var(--line-accent);
  border-radius:var(--radius-pill);
  background:var(--ink-800);
  color:var(--cyan);
  cursor:pointer;
  font:500 12px/1 var(--font-mono);
  letter-spacing:.08em;
  box-shadow:0 16px 34px -20px rgba(0,0,0,.95);
  transition:transform .2s var(--ease),background-color .2s var(--ease);
}
.to-top:hover{background:#152744;transform:translateY(-2px);}
.to-top__mark{font-size:13px;line-height:1;}
.to-top__text{font-family:var(--font-sans);font-weight:600;}

/* ---------- 页脚 ---------- */
.site-footer{
  margin-top:5rem;
  background:linear-gradient(180deg,#0B1524 0%,#0A1220 100%);
  border-top:1px solid rgba(0,229,201,.22);
  position:relative;
}
.site-footer::before{
  content:"";
  position:absolute;
  left:0;
  right:0;
  top:-1px;
  height:3px;
  background:linear-gradient(90deg,var(--cyan),var(--orange) 45%,var(--turf) 75%,var(--clay));
  opacity:.75;
}

.footer-grid{
  max-width:var(--shell-max);
  margin:0 auto;
  padding:3.5rem 2rem 2.5rem;
  display:grid;
  grid-template-columns:1.4fr 1fr 1.7fr 1.1fr;
  gap:2rem 2.5rem;
}

.footer-col{min-width:0;}
.footer-col--brand{padding-right:1.5rem;border-right:1px solid var(--line);}

.footer-wordmark{
  font:900 24px/1.1 var(--font-sans);
  letter-spacing:.04em;
  color:var(--paper);
}
.footer-tagline{
  margin-top:.7rem;
  font-size:15px;
  line-height:1.7;
  color:var(--paper-dim);
}
.footer-meta{
  margin-top:.7rem;
  font:500 12px/1.4 var(--font-mono);
  letter-spacing:.1em;
  color:var(--cyan);
}
.footer-title{
  margin-bottom:.85rem;
  font:500 12px/1 var(--font-mono);
  letter-spacing:.16em;
  color:var(--cyan);
  text-transform:uppercase;
}
.footer-title::before{
  content:"—";
  margin-right:.5em;
  color:var(--orange);
}
.footer-list{
  list-style:none;
  display:flex;
  flex-direction:column;
  gap:.45rem;
}
.footer-list a{
  color:var(--mist);
  text-decoration:none;
  font-size:14.5px;
  transition:color .18s var(--ease);
}
.footer-list a:hover{color:var(--cyan);}

.contact-list dt{
  font:500 11px/1.6 var(--font-mono);
  letter-spacing:.12em;
  color:var(--moss);
}
.contact-list dd{
  margin:0 0 .7rem;
  font-size:14.5px;
  color:var(--paper);
  font-variant-numeric:tabular-nums;
  word-break:break-all;
}

.footer-note{
  margin-top:.9rem;
  font-size:12.5px;
  line-height:1.7;
  color:var(--mist);
}
.footer-cta{margin-top:1rem;}
.footer-cta .btn{width:100%;justify-content:center;}

.footer-base{
  max-width:var(--shell-max);
  margin:0 auto;
  padding:1.2rem 2rem 1.6rem;
  display:flex;
  flex-wrap:wrap;
  align-items:center;
  justify-content:space-between;
  gap:.6rem;
  border-top:1px solid var(--line);
}
.footer-legal{
  font:500 12px/1.6 var(--font-mono);
  letter-spacing:.06em;
  color:var(--paper-dim);
  font-variant-numeric:tabular-nums;
}
.footer-legal--dim{color:var(--mist);}

/* ---------- 通用容器与章节 ---------- */
.page-top{padding-top:clamp(1.6rem,4vw,3rem);}
.wrap{
  width:100%;
  max-width:var(--shell-max);
  margin-inline:auto;
  padding-inline:2rem;
}

.section{padding:3.5rem 0;}
.section--tight{padding:2rem 0;}

.section-head{
  display:flex;
  flex-wrap:wrap;
  align-items:flex-end;
  justify-content:space-between;
  gap:1rem;
  margin-bottom:1.6rem;
}
.section-title{
  font:900 clamp(1.6rem,3vw,2.4rem)/1.15 var(--font-sans);
  letter-spacing:-.02em;
  color:var(--paper);
}
.section-sub{
  margin-top:.45rem;
  font-size:15px;
  color:var(--mist);
}
.kicker{
  display:inline-flex;
  align-items:center;
  gap:.6rem;
  font:500 12px/1 var(--font-mono);
  letter-spacing:.16em;
  color:var(--cyan);
  text-transform:uppercase;
}
.kicker::before{
  content:"";
  width:28px;
  height:1px;
  background:currentColor;
  opacity:.75;
}
.lede{
  max-width:52ch;
  font-size:clamp(1.05rem,1.6vw,1.25rem);
  line-height:1.7;
  color:#D6D2C8;
}
.note{
  margin:1.2rem 0;
  padding-left:.85rem;
  border-left:2px solid rgba(199,161,122,.65);
  font-size:13.5px;
  line-height:1.7;
  color:var(--clay);
}
.divider{
  height:1px;
  border:0;
  margin:2.5rem 0;
  background:linear-gradient(90deg,rgba(0,229,201,.5),rgba(0,229,201,0) 65%);
}

/* ---------- 按钮 ---------- */
.btn{
  display:inline-flex;
  align-items:center;
  gap:.5rem;
  padding:.75rem 1.25rem;
  border:1px solid var(--line-accent);
  border-radius:var(--radius-pill);
  background:transparent;
  color:var(--paper);
  text-decoration:none;
  font:500 14px/1 var(--font-sans);
  letter-spacing:.04em;
  cursor:pointer;
  transition:color .2s var(--ease),background-color .2s var(--ease),border-color .2s var(--ease),transform .2s var(--ease);
}
.btn:hover{
  color:var(--cyan);
  border-color:var(--cyan);
  transform:translateY(-1px);
}
.btn--primary{
  background:var(--cyan);
  border-color:var(--cyan);
  color:#04121A;
  font-weight:700;
}
.btn--primary:hover{
  background:#5CFBE6;
  border-color:#5CFBE6;
  color:#04121A;
  box-shadow:0 12px 26px -14px rgba(0,229,201,.85);
}
.btn--ghost{
  border-color:var(--line);
  color:var(--paper-dim);
}
.btn--ghost:hover{
  border-color:var(--line-accent);
  color:var(--cyan);
}
.btn--block{
  display:flex;
  width:100%;
  justify-content:center;
}

/* ---------- 标签 ---------- */
.tag{
  display:inline-flex;
  align-items:center;
  gap:.35rem;
  padding:.3rem .6rem;
  border:1px solid var(--line);
  border-radius:4px;
  font:500 12px/1 var(--font-mono);
  letter-spacing:.08em;
  text-transform:uppercase;
  color:var(--mist);
}
.tag--cyan{color:var(--cyan);border-color:rgba(0,229,201,.5);background:rgba(0,229,201,.1);}
.tag--orange{color:#FFB08C;border-color:rgba(255,106,43,.5);background:rgba(255,106,43,.12);}
.tag--turf{color:#9BEA9F;border-color:rgba(63,163,77,.55);background:rgba(63,163,77,.14);}
.tag--clay{color:var(--clay);border-color:rgba(199,161,122,.5);background:rgba(199,161,122,.12);}
.tag--moss{color:#B7C3A8;border-color:rgba(124,139,107,.55);background:rgba(124,139,107,.16);}

/* ---------- 卡片 ---------- */
.card{
  position:relative;
  padding:1.1rem 1.15rem;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(180deg,#101B2E,#0E1829);
  box-shadow:0 2px 0 rgba(0,0,0,.32), 0 16px 34px -30px rgba(0,229,201,.6);
}
.card--s{padding:.8rem .9rem;border-radius:var(--radius-sm);}
.card--l{padding:1.6rem;}
.card--xl{padding:2rem;border-radius:12px;}
.card--accent{border-color:var(--line-accent);}
.card__head{
  display:flex;
  align-items:center;
  justify-content:space-between;
  gap:1rem;
  margin-bottom:.8rem;
}
.card__title{
  font:700 1.05rem/1.4 var(--font-sans);
  color:var(--paper);
}
.card__foot{
  display:flex;
  align-items:center;
  gap:.75rem;
  margin-top:1rem;
  padding-top:.8rem;
  border-top:1px solid var(--line);
}

.data-num{
  font:600 1rem/1.25 var(--font-mono);
  letter-spacing:.02em;
  color:var(--paper);
  font-variant-numeric:tabular-nums;
}

/* ---------- 网格 ---------- */
.grid-12{
  display:grid;
  grid-template-columns:repeat(12,1fr);
  gap:1.25rem;
}
.span-1{grid-column:span 1;}
.span-2{grid-column:span 2;}
.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-10{grid-column:span 10;}
.span-11{grid-column:span 11;}
.span-12{grid-column:span 12;}

/* ---------- 面包屑 ---------- */
.breadcrumb{padding-top:1rem;}
.breadcrumb__list{
  display:flex;
  flex-wrap:wrap;
  gap:.5rem;
  list-style:none;
  font:500 12px/1.5 var(--font-mono);
  letter-spacing:.08em;
  color:var(--mist);
}
.breadcrumb__list li+li::before{
  content:"/";
  margin-right:.5rem;
  color:rgba(154,167,184,.5);
}
.breadcrumb a{
  color:var(--mist);
  text-decoration:none;
  transition:color .18s var(--ease);
}
.breadcrumb a:hover{color:var(--cyan);}
.breadcrumb [aria-current="page"]{color:var(--paper);}

/* ---------- 正文排版 ---------- */
.prose{
  font-size:16.5px;
  line-height:1.75;
  color:#DCD8CE;
}
.prose p{margin:0 0 1.2em;}
.prose h2{
  margin:2.2em 0 .6em;
  font:800 clamp(1.45rem,2.4vw,2rem)/1.25 var(--font-sans);
  letter-spacing:-.01em;
  color:var(--paper);
}
.prose h3{
  margin:1.8em 0 .5em;
  font:700 1.2rem/1.35 var(--font-sans);
  color:var(--paper);
}
.prose a{color:var(--cyan);}
.prose ul,.prose ol{margin:0 0 1.2em;padding-left:1.25em;}
.prose li{margin:.35em 0;}
.prose blockquote{
  margin:1.6em 0;
  padding:.9rem 1.2rem;
  border-left:2px solid var(--clay);
  background:rgba(199,161,122,.07);
  color:#E4DCD0;
}
.prose code{
  padding:.1em .35em;
  border-radius:4px;
  background:rgba(0,229,201,.1);
  font-family:var(--font-mono);
  font-size:.92em;
}
.prose table{
  width:100%;
  margin:1.4em 0;
  border-collapse:collapse;
  font-family:var(--font-mono);
  font-size:14px;
  font-variant-numeric:tabular-nums;
}
.prose th,.prose td{
  padding:.65rem .7rem;
  text-align:left;
  border-bottom:1px solid var(--line);
}
.prose thead th{
  color:var(--cyan);
  font-weight:500;
  letter-spacing:.06em;
}
.prose tbody tr:nth-child(even){background:rgba(27,40,60,.5);}

/* ---------- 图片容器 ---------- */
.media{
  position:relative;
  display:block;
  overflow:hidden;
  border:1px solid var(--line);
  border-radius:var(--radius);
  background:linear-gradient(135deg,#132038,#0E1B2E 60%,#152840);
}
.media__inner{
  display:block;
  width:100%;
  aspect-ratio:16/9;
  background:linear-gradient(135deg,#132038,#0E1B2E 60%,#152840);
}
.media__inner img{
  display:block;
  width:100%;
  height:100%;
  object-fit:cover;
  transition:transform .5s var(--ease);
}
.media:hover .media__inner img{transform:scale(1.03);}
.media--4x3 .media__inner{aspect-ratio:4/3;}
.media--1x1 .media__inner{aspect-ratio:1/1;}
.media--21x9 .media__inner{aspect-ratio:21/9;}
.media::after{
  content:"";
  position:absolute;
  inset:0;
  pointer-events:none;
  background-image:
    linear-gradient(rgba(0,229,201,.07) 1px, transparent 1px),
    linear-gradient(90deg, rgba(0,229,201,.07) 1px, transparent 1px);
  background-size:32px 32px;
}
.media__cap{
  position:absolute;
  left:0;
  right:0;
  bottom:0;
  padding:.7rem .9rem;
  background:linear-gradient(180deg,rgba(10,18,32,0),rgba(10,18,32,.92));
  color:var(--paper);
  font:400 13px/1.5 var(--font-sans);
}

/* ---------- 滚动显现 ---------- */
[data-reveal]{
  opacity:0;
  transform:translateY(18px);
  transition:opacity .6s var(--ease),transform .6s var(--ease);
  transition-delay:var(--reveal-delay,0ms);
}
[data-reveal].is-visible{
  opacity:1;
  transform:none;
}

/* ---------- 宽屏轨道展开 ---------- */
@media (min-width:1440px){
  :root{--rail-w:240px;}
  .brand-rail{
    align-items:flex-start;
    padding:1.6rem 1.4rem 1.8rem;
    gap:1.2rem;
  }
  .brand-mark{
    flex-direction:row;
    align-items:center;
    gap:.65rem;
    width:100%;
  }
  .brand-word{
    writing-mode:horizontal-tb;
    font-size:15px;
    letter-spacing:.18em;
  }
  .rail-domain{
    writing-mode:horizontal-tb;
    font-size:11px;
    letter-spacing:.1em;
  }
  .rail-domain__full{display:inline;}
  .rail-domain__short{display:none;}
  .rail-version{
    writing-mode:horizontal-tb;
    font-size:11.5px;
  }
  .rail-links{
    flex-direction:row;
    flex-wrap:wrap;
    margin-top:auto;
  }
  .rail-link{
    flex:1 1 46%;
    font-size:13px;
    padding:.6rem .7rem;
  }
  .rail-meter{
    flex-direction:row;
    gap:.3rem;
  }
  .rail-note{
    display:block;
    writing-mode:horizontal-tb;
    font-size:11px;
    letter-spacing:.14em;
    color:var(--moss);
  }
}

/* ---------- 平板与手机 ---------- */
@media (max-width:1080px){
  body{
    padding-left:0;
    padding-bottom:78px;
    background-attachment:scroll;
  }

  .wrap{padding-inline:1.25rem;}
  .section{padding:2.5rem 0;}
  .section--tight{padding:1.6rem 0;}

  .site-header{
    position:sticky;
    top:0;
    z-index:80;
    background:#0A1220;
    border-bottom:1px solid rgba(0,229,201,.22);
  }

  .brand-rail{
    position:static;
    inset:auto;
    width:auto;
    flex-direction:row;
    align-items:center;
    justify-content:flex-start;
    gap:.85rem;
    padding:.7rem 1.1rem .55rem;
    background:transparent;
    border-right:0;
  }
  .brand-mark{
    flex-direction:row;
    align-items:center;
    gap:.55rem;
  }
  .brand-glyph{
    width:34px;
    height:34px;
    border-radius:7px;
    font-size:20px;
  }
  .brand-word{
    writing-mode:horizontal-tb;
    font-size:14px;
    letter-spacing:.16em;
  }
  .rail-domain{
    writing-mode:horizontal-tb;
    font-size:11px;
    letter-spacing:.1em;
  }
  .rail-domain__full{display:inline;}
  .rail-domain__short{display:none;}
  .rail-version{
    writing-mode:horizontal-tb;
    margin-left:auto;
    font-size:11px;
  }
  .rail-links,
  .rail-meter,
  .rail-note{display:none;}

  .header-bar{
    position:relative;
    top:auto;
    background:transparent;
    -webkit-backdrop-filter:none;
    backdrop-filter:none;
    border-bottom:0;
  }
  .header-bar__inner{padding:.45rem 1.1rem .7rem;}
  .header-tagline{font-size:10.5px;letter-spacing:.16em;}

  .nav-toggle{display:inline-flex;}

  .site-nav{
    position:absolute;
    left:0;
    right:0;
    top:100%;
    display:none;
    padding:.6rem 1rem 1.1rem;
    background:#0C1627;
    border-bottom:1px solid rgba(0,229,201,.3);
    box-shadow:0 26px 44px -30px rgba(0,0,0,.95);
    max-height:calc(100vh - 150px);
    overflow-y:auto;
  }
  .site-nav[data-open]{display:block;}
  .site-nav__list{
    flex-direction:column;
    align-items:stretch;
    gap:.25rem;
  }
  .site-nav a{
    padding:.75rem .9rem;
    border-radius:var(--radius-sm);
    border-color:var(--line);
    background:rgba(16,27,46,.7);
    font-size:15px;
  }
  .site-nav a:hover{background:rgba(0,229,201,.1);}

  .dock-cta{
    display:flex;
    position:fixed;
    left:0;
    right:0;
    bottom:0;
    z-index:90;
    gap:.6rem;
    padding:.6rem .9rem calc(.6rem + env(safe-area-inset-bottom, 0px));
    background:rgba(10,18,32,.97);
    border-top:1px solid rgba(0,229,201,.3);
  }
  .dock-cta__link{
    flex:1;
    padding:.7rem .5rem;
    border:1px solid var(--line-accent);
    border-radius:var(--radius-sm);
    color:var(--paper);
    text-decoration:none;
    text-align:center;
    font:600 14px/1 var(--font-sans);
    letter-spacing:.04em;
  }
  .dock-cta__link--accent{
    background:var(--cyan);
    border-color:var(--cyan);
    color:#04121A;
  }

  .to-top{bottom:5.2rem;}

  .footer-grid{
    grid-template-columns:1fr 1fr;
    padding:2.6rem 1.25rem 1.8rem;
  }
  .footer-col--brand{
    padding-right:0;
    border-right:0;
    grid-column:1 / -1;
  }
  .footer-base{padding:1.1rem 1.25rem 1.4rem;}

  .grid-12{grid-template-columns:repeat(6,1fr);gap:1rem;}
  .span-7,.span-8,.span-9,.span-10,.span-11,.span-12{grid-column:1 / -1;}
  .span-4,.span-5,.span-6{grid-column:span 3;}
  .span-1,.span-2,.span-3{grid-column:span 3;}

  .media::after{background-size:24px 24px;}
}

@media (max-width:640px){
  body{font-size:15.5px;}
  .header-tagline{display:none;}
  .footer-grid{grid-template-columns:1fr;}
  .footer-cta .btn{width:100%;}
  .grid-12{grid-template-columns:1fr;}
  .span-1,.span-2,.span-3,.span-4,.span-5,.span-6,
  .span-7,.span-8,.span-9,.span-10,.span-11,.span-12{grid-column:1 / -1;}
  .to-top__text{display:none;}
  .to-top{padding:.7rem;border-radius:50%;}
}

/* ---------- 减弱动效 ---------- */
@media (prefers-reduced-motion: reduce){
  html{scroll-behavior:auto;}
  *,*::before,*::after{
    animation-duration:.01ms !important;
    animation-iteration-count:1 !important;
    transition-duration:.01ms !important;
    transition-delay:0ms !important;
    scroll-behavior:auto !important;
  }
  [data-reveal]{
    opacity:1;
    transform:none;
  }
  .media:hover .media__inner img{transform:none;}
  .btn:hover{transform:none;}
  .to-top:hover{transform:none;}
}