/* ========== 01 tokens ========== */
:root{
  --ink-0:#070B18;
  --ink-1:#0E1830;
  --panel:#121C33;
  --line:#1E2C4A;
  --cyan:#35E6D2;
  --violet:#8A6BFF;
  --lime:#9BFF5C;
  --amber:#FFB347;
  --text:#EAF1FF;
  --dim:#93A1BD;
  --warm:#F4F7FF;
  --on-accent:#04121A;

  --header-bg:linear-gradient(160deg, rgba(18,28,51,.97), rgba(7,11,24,.95));
  --footer-bg:linear-gradient(180deg, rgba(14,24,48,.92), rgba(7,11,24,1));
  --card-bg:linear-gradient(155deg, rgba(18,28,51,.94), rgba(10,16,32,.9));
  --glow-1:rgba(138,107,255,.22);
  --glow-2:rgba(53,230,210,.14);
  --grid-line:rgba(30,44,74,.55);

  --radius-sm:12px;
  --radius-md:18px;
  --radius-lg:28px;
  --page-max:1240px;
  --gutter:clamp(16px,4vw,40px);
  --shadow-panel:0 24px 60px rgba(2,5,14,.55);
  --ease:cubic-bezier(.22,.61,.36,1);

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

  color-scheme:dark;
}

:root[data-theme="light"]{
  --ink-0:#F4F7FF;
  --ink-1:#E6EEFB;
  --panel:#FFFFFF;
  --line:#C6D3E8;
  --cyan:#0E9E92;
  --violet:#6B4BE0;
  --lime:#4E9E1F;
  --amber:#B96B00;
  --text:#0B1426;
  --dim:#4E5F7E;
  --on-accent:#F7FBFE;

  --header-bg:linear-gradient(160deg, rgba(255,255,255,.98), rgba(233,241,253,.96));
  --footer-bg:linear-gradient(180deg,#EAF0FC,#F8FBFF);
  --card-bg:linear-gradient(155deg,#FFFFFF,#F1F6FF);
  --glow-1:rgba(138,107,255,.14);
  --glow-2:rgba(53,230,210,.18);
  --grid-line:rgba(120,145,185,.28);
  --shadow-panel:0 20px 48px rgba(20,40,80,.12);

  color-scheme:light;
}

/* ========== 02 reset ========== */
*,*::before,*::after{box-sizing:border-box}
html{
  margin:0;padding:0;
  -webkit-text-size-adjust:100%;
  scroll-behavior:smooth;
  scroll-padding-top:120px;
}
body{
  margin:0;
  min-height:100vh;
  background-color:var(--ink-0);
  background-image:
    radial-gradient(1100px 680px at 80% -12%, var(--glow-1), transparent 62%),
    radial-gradient(860px 560px at 6% 2%, var(--glow-2), transparent 60%);
  background-repeat:no-repeat;
  color:var(--text);
  font-family:var(--font-body);
  font-size:17px;
  line-height:1.75;
  letter-spacing:.005em;
  -webkit-font-smoothing:antialiased;
  text-rendering:optimizeLegibility;
}
body::before{
  content:"";
  position:fixed;
  inset:0;
  z-index:-1;
  pointer-events:none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size:96px 96px;
  opacity:.45;
  -webkit-mask-image:radial-gradient(120% 90% at 50% 0%, #000 28%, transparent 82%);
  mask-image:radial-gradient(120% 90% at 50% 0%, #000 28%, transparent 82%);
}
h1,h2,h3,h4,h5,p,figure,blockquote{margin:0}
ul,ol{margin:0;padding:0;list-style:none}
img,svg{display:block;max-width:100%}
a{color:inherit}
button{font:inherit;color:inherit;background:none;border:0;cursor:pointer}
strong{font-weight:700}
::selection{background:rgba(53,230,210,.28);color:var(--text)}
:focus-visible{outline:2px solid var(--cyan);outline-offset:3px;border-radius:8px}
html.is-nav-open{overflow:hidden}

/* ========== 03 typography ========== */
h1,h2,h3,h4{line-height:1.05;font-weight:700;letter-spacing:-.01em}
p{max-width:38ch}
.num,.mono{font-family:var(--font-mono);font-variant-numeric:tabular-nums;letter-spacing:-.01em}
.eyebrow{
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.22em;text-transform:uppercase;
  color:var(--dim);
}
.eyebrow::before{content:"";width:26px;height:1px;background:var(--cyan);flex:0 0 auto}
.section-title{font-size:clamp(26px,3.6vw,44px)}
.lede{font-size:clamp(15px,1.4vw,18px);line-height:1.8;color:var(--dim);max-width:40ch}
.small-note{font-size:12px;line-height:1.7;color:var(--dim);letter-spacing:.04em}

/* ========== 04 layout ========== */
#main-content{position:relative;z-index:1;display:block}
.container{width:100%;max-width:var(--page-max);margin-inline:auto;padding-inline:var(--gutter)}
.section{padding-block:clamp(36px,6vw,84px)}
.section-head{display:grid;gap:14px;margin-bottom:clamp(20px,3vw,38px)}
.grid{display:grid;gap:clamp(18px,2.6vw,32px)}
.grid--2{grid-template-columns:repeat(2,minmax(0,1fr))}
.grid--3{grid-template-columns:repeat(3,minmax(0,1fr))}
.grid--4{grid-template-columns:repeat(4,minmax(0,1fr))}
.split{display:grid;gap:clamp(20px,3vw,48px)}
.split--4-8{grid-template-columns:minmax(0,4fr) minmax(0,8fr)}
.split--5-7{grid-template-columns:minmax(0,5fr) minmax(0,7fr)}
.split--7-5{grid-template-columns:minmax(0,7fr) minmax(0,5fr)}

/* ========== 05 shared components ========== */
.btn{
  display:inline-flex;align-items:center;justify-content:center;gap:8px;
  padding:11px 20px;border-radius:999px;
  border:1px solid transparent;
  font-size:14px;font-weight:600;letter-spacing:.02em;
  text-decoration:none;white-space:nowrap;
  transition:transform .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease),color .2s var(--ease),box-shadow .2s var(--ease);
}
.btn-primary{
  background:linear-gradient(118deg,var(--cyan),#6FF3E4 58%,var(--violet));
  color:var(--on-accent);
  box-shadow:0 10px 26px rgba(53,230,210,.22);
}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 34px rgba(53,230,210,.32)}
.btn-primary:active{transform:translateY(0)}
.btn-ghost{
  border-color:var(--line);
  color:var(--text);
  background:rgba(18,28,51,.55);
}
:root[data-theme="light"] .btn-ghost{background:rgba(255,255,255,.75)}
.btn-ghost:hover{border-color:rgba(53,230,210,.55);color:var(--cyan)}
.btn-quiet{padding:8px 12px;color:var(--dim);font-weight:500}
.btn-quiet:hover{color:var(--cyan)}

.link-btn{
  padding:4px 2px;border-bottom:1px solid transparent;
  font-size:12px;letter-spacing:.08em;color:var(--dim);
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.link-btn:hover,.link-btn[aria-pressed="true"]{color:var(--cyan);border-color:var(--cyan)}

.tag{
  display:inline-flex;align-items:center;gap:6px;
  padding:5px 11px;border-radius:999px;
  border:1px solid var(--line);
  font-family:var(--font-mono);
  font-size:10.5px;letter-spacing:.14em;text-transform:uppercase;
  color:var(--dim);
}
.tag::before{content:"";width:5px;height:5px;border-radius:50%;background:currentColor;flex:0 0 auto}
.tag--live{color:var(--lime);border-color:rgba(155,255,92,.42)}
.tag--warn{color:var(--amber);border-color:rgba(255,179,71,.42)}

.card{
  position:relative;
  padding:clamp(20px,2.4vw,28px);
  border-radius:var(--radius-lg);
  border:1px solid var(--line);
  background:var(--card-bg);
  box-shadow:var(--shadow-panel);
}
.card--glow{box-shadow:var(--shadow-panel),0 0 0 1px rgba(53,230,210,.26),0 0 56px -14px rgba(138,107,255,.55)}
.panel{
  padding:clamp(14px,2vw,22px);
  border-radius:var(--radius-md);
  border:1px solid var(--line);
  background:rgba(18,28,51,.5);
}
:root[data-theme="light"] .panel{background:rgba(255,255,255,.78)}

.crumbs{font-size:12px;letter-spacing:.06em;color:var(--dim)}
.crumbs ol{display:flex;flex-wrap:wrap;align-items:center;gap:8px}
.crumbs li+li::before{content:"/";margin-right:8px;color:var(--line)}
.crumbs a{text-decoration:none;color:var(--dim);transition:color .2s var(--ease)}
.crumbs a:hover{color:var(--cyan)}
.crumbs [aria-current="page"]{color:var(--text)}

.index-rail{
  position:sticky;top:112px;align-self:start;
  display:grid;gap:6px;
  font-size:12px;letter-spacing:.08em;
}
.index-rail a{
  display:flex;align-items:center;gap:10px;
  padding:6px 0 6px 14px;
  border-left:1px solid var(--line);
  color:var(--dim);text-decoration:none;
  transition:color .2s var(--ease),border-color .2s var(--ease);
}
.index-rail a:hover{color:var(--text);border-color:var(--cyan)}
.index-rail a[aria-current="true"]{color:var(--cyan);border-color:var(--cyan)}

.media-frame{
  position:relative;overflow:hidden;
  aspect-ratio:16/9;
  border-radius:var(--radius-md);
  border:1px solid var(--line);
  background:
    linear-gradient(150deg, rgba(138,107,255,.18), rgba(53,230,210,.09) 55%, transparent 82%),
    var(--panel);
}
.media-frame::after{
  content:"";position:absolute;inset:0;z-index:2;pointer-events:none;
  background-image:
    linear-gradient(to right, var(--grid-line) 1px, transparent 1px),
    linear-gradient(to bottom, var(--grid-line) 1px, transparent 1px);
  background-size:44px 44px;
  opacity:.55;
}
.media-frame > img{position:relative;z-index:1;width:100%;height:100%;object-fit:cover}
.media-frame--wide{aspect-ratio:21/9}
.media-frame--tall{aspect-ratio:3/4}
.media-frame--square{aspect-ratio:1/1}
.media-frame--schematic{aspect-ratio:4/3}
.figure-note{margin-top:10px;font-family:var(--font-mono);font-size:11px;letter-spacing:.1em;color:var(--dim)}

/* ========== 06 header ========== */
.skip-link{
  position:fixed;left:50%;top:-120px;transform:translateX(-50%);
  z-index:999;
  padding:12px 22px;border-radius:999px;
  background:var(--cyan);color:var(--on-accent);
  font-size:14px;font-weight:700;text-decoration:none;
  transition:top .24s var(--ease);
}
.skip-link:focus{top:14px}

.site-header{
  position:sticky;top:14px;z-index:90;
  width:calc(100% - (var(--gutter) * 2));
  max-width:var(--page-max);
  margin:14px auto 0;
  display:flex;align-items:center;gap:clamp(6px,1.6vw,22px);
  padding:8px 10px 8px 16px;
  border:1px solid var(--line);
  border-radius:999px;
  background:var(--header-bg);
  box-shadow:0 18px 44px rgba(2,5,14,.55),inset 0 1px 0 rgba(234,241,255,.07);
  transition:padding .32s var(--ease),box-shadow .32s var(--ease);
}
:root[data-theme="light"] .site-header{box-shadow:0 16px 36px rgba(24,48,92,.14),inset 0 1px 0 rgba(255,255,255,.9)}
.site-header[data-condensed="true"]{
  padding-block:4px;
  box-shadow:0 12px 32px rgba(2,5,14,.72),inset 0 1px 0 rgba(234,241,255,.09);
}
.site-header[data-condensed="true"] .brand-sub{opacity:0}

.brand{
  display:inline-flex;align-items:center;gap:10px;
  flex:0 0 auto;padding:4px 6px;border-radius:999px;
  text-decoration:none;
}
.brand-mark{position:relative;display:grid;place-items:center;width:32px;height:32px;flex:0 0 auto}
.brand-mark::before{
  content:"";position:absolute;inset:4px;
  border-radius:50%;border:1px solid rgba(138,107,255,.75);
  transform:rotate(-28deg) scaleY(.44);
}
.brand-orbit{
  position:absolute;inset:0;border-radius:50%;
  border:1px solid rgba(53,230,210,.5);
}
.brand-orbit::after{
  content:"";position:absolute;top:-2.5px;left:50%;
  width:5px;height:5px;border-radius:50%;
  transform:translateX(-50%);
  background:var(--cyan);
  box-shadow:0 0 10px var(--cyan);
  animation:orbit-spin 18s linear infinite;
  transform-origin:0 18.5px;
}
@keyframes orbit-spin{from{transform:translateX(-50%) rotate(0deg) translateX(0)}to{transform:translateX(-50%) rotate(360deg)}}
.brand-core{
  width:7px;height:7px;border-radius:50%;
  background:linear-gradient(140deg,var(--cyan),var(--violet));
  box-shadow:0 0 12px rgba(53,230,210,.75);
}
.brand-text{display:flex;flex-direction:column;line-height:1.12}
.brand-name{font-size:16px;font-weight:700;letter-spacing:.06em;color:var(--text)}
.brand-sub{
  font-family:var(--font-mono);
  font-size:9px;letter-spacing:.22em;color:var(--dim);
  transition:opacity .28s var(--ease);
}
.brand--footer{padding-left:0}

.site-nav{display:flex;align-items:center;gap:4px;margin-inline:auto;min-width:0}
.nav-list{display:flex;align-items:center;gap:2px}
.nav-caption,.nav-foot{display:none}
.nav-link{
  display:inline-flex;align-items:center;gap:7px;
  padding:9px 13px;border-radius:999px;
  border:1px solid transparent;
  color:var(--dim);text-decoration:none;
  font-size:13.5px;letter-spacing:.02em;white-space:nowrap;
  transition:color .2s var(--ease),background .2s var(--ease),border-color .2s var(--ease);
}
.nav-num{font-family:var(--font-mono);font-size:10px;letter-spacing:.06em;opacity:.7}
.nav-link:hover{color:var(--text);background:rgba(53,230,210,.1);border-color:rgba(53,230,210,.3)}
.nav-link[aria-current="page"]{
  background:var(--cyan);
  border-color:var(--cyan);
  color:var(--on-accent);
  font-weight:700;
}
.nav-link[aria-current="page"] .nav-num{opacity:.75}

.header-actions{display:flex;align-items:center;gap:8px;flex:0 0 auto}
.theme-toggle{
  display:inline-flex;align-items:center;gap:7px;
  padding:8px 12px;border-radius:999px;
  border:1px solid var(--line);
  color:var(--dim);
  font-size:11px;letter-spacing:.14em;
  transition:color .2s var(--ease),border-color .2s var(--ease),background .2s var(--ease);
}
.theme-toggle:hover{color:var(--text);border-color:rgba(53,230,210,.45)}
.theme-toggle-dot{
  width:8px;height:8px;border-radius:50%;
  background:var(--cyan);
  box-shadow:0 0 0 3px rgba(53,230,210,.18);
}
.header-cta{padding:9px 18px;font-size:13px;border-radius:999px}

.nav-toggle{
  display:none;align-items:center;gap:8px;
  position:relative;z-index:110;
  padding:9px 14px;border-radius:999px;
  border:1px solid var(--line);
  color:var(--text);
  font-size:11px;letter-spacing:.14em;
}
.nav-toggle-bars{display:inline-flex;flex-direction:column;gap:4px;width:16px}
.nav-toggle-bars span{
  display:block;height:1.5px;border-radius:2px;background:currentColor;
  transition:transform .24s var(--ease),opacity .2s var(--ease);
}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:first-child{transform:translateY(2.75px) rotate(45deg)}
.nav-toggle[aria-expanded="true"] .nav-toggle-bars span:last-child{transform:translateY(-2.75px) rotate(-45deg)}

.scroll-rail{
  position:fixed;top:50%;right:10px;
  transform:translateY(-50%);
  width:2px;height:170px;
  border-radius:2px;
  background:var(--line);
  z-index:80;
  pointer-events:none;
}
.scroll-rail-fill{
  display:block;width:100%;height:0;
  border-radius:2px;
  background:linear-gradient(var(--cyan),var(--violet));
  transition:height .14s linear;
}

/* ========== 07 footer ========== */
.site-footer{
  position:relative;
  margin-top:clamp(56px,8vw,120px);
  border-top:1px solid var(--line);
  background:var(--footer-bg);
}
.site-footer::before{
  content:"";position:absolute;inset:0 0 auto 0;height:1px;
  background:linear-gradient(90deg,transparent,rgba(53,230,210,.55),rgba(138,107,255,.5),transparent);
}
.footer-inner{
  max-width:var(--page-max);
  margin-inline:auto;
  padding:clamp(40px,6vw,72px) var(--gutter) clamp(22px,3vw,32px);
}
.footer-grid{
  display:grid;
  grid-template-columns:1.5fr .9fr 1fr 1.4fr;
  gap:clamp(24px,4vw,54px);
}
.footer-tagline{
  margin-top:16px;
  max-width:30ch;
  font-size:14px;line-height:1.8;color:var(--dim);
}
.footer-icp{
  margin-top:14px;
  font-family:var(--font-mono);
  font-size:11px;letter-spacing:.12em;color:var(--dim);
}
.footer-title{
  display:flex;align-items:center;gap:8px;
  font-size:11px;font-weight:700;
  letter-spacing:.22em;text-transform:uppercase;
  color:var(--text);
}
.footer-title::before{
  content:"";width:6px;height:6px;border-radius:50%;
  background:var(--cyan);flex:0 0 auto;
}
.footer-list{margin-top:16px;display:grid;gap:10px;font-size:14px}
.footer-list a{
  color:var(--dim);text-decoration:none;
  transition:color .2s var(--ease),padding-left .2s var(--ease);
}
.footer-list a:hover{color:var(--cyan);padding-left:4px}
.footer-list--plain li{display:grid;gap:2px}
.footer-label{
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.18em;text-transform:uppercase;color:var(--dim);
}
.footer-value{font-size:13.5px;line-height:1.6;color:var(--text);word-break:break-word}
.footer-note{
  margin-top:14px;padding-left:12px;
  border-left:1px solid var(--line);
  font-size:12px;line-height:1.75;color:var(--dim);
  max-width:34ch;
}
.footer-base{
  display:flex;flex-wrap:wrap;align-items:center;gap:16px;
  margin-top:clamp(28px,4vw,48px);padding-top:20px;
  border-top:1px solid var(--line);
  font-size:12px;color:var(--dim);
}
.footer-copy{margin-right:auto;max-width:none;letter-spacing:.04em}
.footer-theme{display:inline-flex;align-items:center;gap:8px}
.footer-divider{color:var(--line)}
.footer-scale{
  margin-left:auto;
  display:inline-flex;align-items:center;gap:10px;
  font-family:var(--font-mono);
  font-size:10px;letter-spacing:.16em;color:var(--dim);
}
.footer-scale-line{
  width:64px;height:1px;
  background:repeating-linear-gradient(90deg,var(--dim) 0 4px,transparent 4px 8px);
  opacity:.55;
}

/* ========== 08 motion ========== */
[data-reveal]{
  opacity:0;
  transform:translateY(8px);
  transition:opacity .32s var(--ease),transform .32s var(--ease);
  transition-delay:calc(var(--i,0) * 40ms);
}
[data-reveal].is-visible{opacity:1;transform:none}

/* ========== 09 responsive ========== */
@media (max-width:1200px){
  .nav-link{padding:9px 10px;font-size:13px}
  .nav-num{display:none}
}
@media (max-width:1080px){
  .scroll-rail{display:none}
  .site-header{gap:8px;padding:8px 10px 8px 14px}
  .nav-toggle{display:inline-flex}
  .theme-toggle{padding:8px;gap:0}
  .theme-toggle-text{display:none}
  .brand,.header-actions{position:relative;z-index:110}
  .nav-num{display:inline}

  .site-nav{
    position:fixed;
    inset:0;
    z-index:100;
    display:flex;
    flex-direction:column;
    align-items:stretch;
    gap:0;
    margin:0;
    padding:calc(92px + env(safe-area-inset-top)) var(--gutter) 48px;
    overflow-y:auto;
    overscroll-behavior:contain;
    background:
      radial-gradient(680px 420px at 82% -6%, var(--glow-1), transparent 64%),
      radial-gradient(520px 380px at 4% 6%, var(--glow-2), transparent 62%),
      var(--ink-0);
    opacity:0;
    visibility:hidden;
    transform:translateY(-10px);
    transition:opacity .26s var(--ease),transform .26s var(--ease),visibility .26s var(--ease);
  }
  .site-nav[data-open="true"]{opacity:1;visibility:visible;transform:none}
  .nav-caption{
    display:block;
    margin-bottom:10px;
    font-family:var(--font-mono);
    font-size:10px;letter-spacing:.24em;text-transform:uppercase;
    color:var(--dim);
  }
  .nav-list{flex-direction:column;align-items:stretch;gap:0;width:100%}
  .nav-item{border-bottom:1px solid var(--line)}
  .nav-link{
    width:100%;
    justify-content:flex-start;
    gap:14px;
    padding:16px 6px;
    border:0;
    border-radius:0;
    font-size:19px;
    color:var(--text);
  }
  .nav-link:hover{background:none;color:var(--cyan)}
  .nav-link[aria-current="page"]{
    background:none;
    color:var(--cyan);
    font-weight:700;
  }
  .nav-link[aria-current="page"] .nav-label{border-bottom:1px solid var(--cyan)}
  .nav-num{font-size:11px;opacity:.6;min-width:24px}
  .nav-foot{
    display:block;
    margin-top:28px;padding-top:18px;
    border-top:1px solid var(--line);
    font-size:12px;color:var(--dim);
  }
  .nav-foot-mail{
    font-family:var(--font-mono);
    font-size:12px;letter-spacing:.02em;
    color:var(--text);word-break:break-all;max-width:none;
  }
  .nav-foot-icp{margin-top:6px;font-size:11px;letter-spacing:.14em;max-width:none}

  .footer-grid{grid-template-columns:repeat(2,minmax(0,1fr))}
  .footer-note{max-width:none}
}

@media (max-width:900px){
  body{font-size:16px}
  .split--4-8,.split--5-7,.split--7-5{grid-template-columns:minmax(0,1fr)}
  .grid--3,.grid--4{grid-template-columns:repeat(2,minmax(0,1fr))}
  .index-rail{
    position:static;
    display:flex;
    gap:8px;
    overflow-x:auto;
    padding-bottom:6px;
    scrollbar-width:thin;
  }
  .index-rail a{white-space:nowrap;border-left:0;border-bottom:1px solid var(--line);padding:6px 2px}
  .index-rail a[aria-current="true"]{border-left:0;border-bottom:1px solid var(--cyan)}
}

@media (max-width:720px){
  .site-header{top:10px;margin-top:10px}
  .header-cta{padding:8px 14px;font-size:12px}
  .footer-grid{grid-template-columns:minmax(0,1fr);gap:28px}
  .footer-base{gap:10px}
  .footer-scale{display:none}
  .grid--2,.grid--3,.grid--4{grid-template-columns:minmax(0,1fr)}
}

@media (max-width:420px){
  .theme-toggle{display:none}
  .brand-sub{display:none}
}

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