:root{
  color-scheme:dark;
  --bg:#070911;
  --text:#f5f7fb;
  --muted:#8b94ab;
  --line:#e5eaff22;
  --cyan:#a0e7e9;
  --accent:#4ef6dc;
  --warm:#f6c177;
}
*{box-sizing:border-box}
[hidden]{display:none!important}
html,body{
  margin:0;
  width:100%;
  height:100%;
  background:var(--bg);
}
body{
  font-family:"PingFang SC","Microsoft YaHei",Inter,system-ui,sans-serif;
  color:var(--text);
  -webkit-font-smoothing:antialiased;
  overflow:hidden;
  user-select:none;
}
button,a{-webkit-tap-highlight-color:transparent}
button{font:inherit;cursor:pointer;color:inherit}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible{outline:2px solid #b9e9ee;outline-offset:6px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.skip-link{position:fixed;z-index:40;top:12px;left:16px;padding:10px 18px;background:#0c1426;border:1px solid var(--line);border-radius:8px;transform:translateY(-160%)}
.skip-link:focus{transform:none}

/* ---------- Full-Viewport Universe Stage ---------- */
.page{
  height:100svh;
  min-height:560px;
  overflow:hidden;
  position:relative;
  isolation:isolate;
  background:
    radial-gradient(ellipse at 50% 53%,#14263852,transparent 46%),
    radial-gradient(ellipse at 62% 90%,#352a4c36,transparent 55%),
    #070911;
}
.grain{
  position:absolute;
  inset:0;
  opacity:.035;
  pointer-events:none;
  z-index:5;
  background-image:url('data:image/svg+xml,%3Csvg viewBox=%220 0 180 180%22 xmlns=%22http://www.w3.org/2000/svg%22%3E%3Cfilter id=%22n%22%3E%3CfeTurbulence type=%22fractalNoise%22 baseFrequency=%22.85%22 numOctaves=%223%22 stitchTiles=%22stitch%22/%3E%3C/filter%3E%3Cpath fill=%22%23fff%22 filter=%22url(%23n)%22 opacity=%22.55%22 d=%22M0 0h180v180H0z%22/%3E%3C/svg%3E');
}
.ambient{
  position:absolute;
  pointer-events:none;
  inset:10% 20% 0;
  background:radial-gradient(ellipse at 50% 53%,#49acbd18,transparent 58%);
  filter:blur(50px);
}
#galaxy-scene{
  position:absolute;
  inset:0;
  width:100%;
  height:100%;
  z-index:0;
  display:block;
}
.vignette{
  position:absolute;
  inset:0;
  pointer-events:none;
  z-index:1;
  background:
    linear-gradient(180deg,#07091166,transparent 25%,transparent 80%,#07091177),
    radial-gradient(ellipse at 50% 51%,transparent 28%,#07091155 96%);
}

/* ---------- Header ---------- */
.home-interface{
  position:relative;
  z-index:6;
  width:100%;
  height:100%;
  pointer-events:none;
  transition:opacity .35s ease;
}
body.immersed .home-interface,
body.immersed .home-constellation,
body.immersed .home-star-card{
  opacity:0;
  pointer-events:none!important;
}
.home-header{
  height:104px;
  padding:0 5%;
  display:flex;
  justify-content:space-between;
  align-items:center;
  pointer-events:auto;
}
.brand{
  display:flex;
  align-items:center;
  gap:12px;
}
.brand-logo{
  width:36px;
  height:36px;
  display:block;
}
.brand-name{
  font-size:22px;
  font-weight:650;
  letter-spacing:-.5px;
  white-space:nowrap;
}
.brand-tag{
  color:#8b95a9;
  border-left:1px solid #a3afc333;
  padding-left:15px;
  margin-left:2px;
  font-size:10px;
  letter-spacing:2px;
}
.nav{
  display:flex;
  gap:24px;
  align-items:center;
}
.group{
  display:flex;
  align-items:center;
  gap:9px;
  border:0;
  background:none;
  color:#8993a6;
  font-size:13px;
  padding:10px 0;
}
.group span{
  color:#c6d8ec;
  letter-spacing:.8px;
  font-variant-numeric:tabular-nums;
}
.group:hover span{color:#a0e7e9}
.console{
  font-size:13px;
  border:1px solid #e4ebff2b;
  border-radius:6px;
  padding:11px 16px;
  display:flex;
  gap:20px;
  align-items:center;
  background:#0c152640;
  backdrop-filter:blur(10px);
  transition:.2s;
}
.console:hover{
  background:#a7dfe714;
  border-color:#bde8f36b;
  transform:translateY(-1px);
}
.arrow{font-size:15px}
.theme-toggle{
  width:36px;
  height:36px;
  padding:0;
  flex-shrink:0;
  display:grid;
  place-items:center;
  border:1px solid #dceaff2b;
  border-radius:50%;
  background:#ffffff06;
  color:#bccbdc;
  transition:background .25s,color .25s,border-color .25s;
}
.theme-toggle:hover{
  background:#b5d9ec18;
  border-color:#dceaff55;
}
.theme-toggle svg{grid-area:1/1;width:17px;height:17px}
.theme-toggle .moon{display:none}
[data-theme="day"] .theme-toggle .sun{display:none}
[data-theme="day"] .theme-toggle .moon{display:block}

/* ---------- Center Hero Stage ---------- */
.hero{
  position:absolute;
  z-index:4;
  top:27%;
  left:20px;
  right:20px;
  text-align:center;
  pointer-events:none;
}
.eyebrow{
  margin:0 0 20px;
  display:flex;
  align-items:center;
  justify-content:center;
  gap:10px;
  color:#b4ced8;
  font-size:12px;
  letter-spacing:4.5px;
}
.eyebrow::before{
  content:"";
  height:4px;
  width:4px;
  box-shadow:0 0 10px #a0e7e999;
  background:#a0e7e9;
  border-radius:50%;
}
.headline-stage{
  position:relative;
  height:142px;
  width:min(100%,1180px);
  margin:auto;
  display:grid;
  place-items:center;
}
.headline{
  position:absolute;
  inset:0;
  display:flex;
  flex-direction:column;
  justify-content:center;
  align-items:center;
  margin:0;
  font-size:clamp(40px,5vw,72px);
  font-weight:580;
  line-height:1.18;
  letter-spacing:-1.5px;
  color:#f2f6fc;
  opacity:0;
  transform:translateY(13px);
  filter:blur(4px);
  transition:opacity 220ms,transform 220ms,filter 220ms;
  text-shadow:0 3px 32px #04070fdd,0 1px 70px #04070faa;
}
.headline span{display:block}
.headline .accent{
  color:#64f4d4;
  font-style:normal;
  text-shadow:0 0 28px rgba(100,244,212,0.32);
}
.headline.active{
  opacity:1;
  transform:translateY(0);
  filter:blur(0);
}
.headline.out{
  opacity:0;
  transform:translateY(-13px);
  filter:blur(4px);
}
.headline.short{
  font-size:clamp(46px,6.2vw,86px);
  letter-spacing:6px;
  padding-left:6px;
}
.headline.quality{
  letter-spacing:-1.5px;
  flex-direction:row;
  white-space:nowrap;
  column-gap:.32em;
  font-size:clamp(42px,5.2vw,76px);
}
.headline.direct{
  font-size:clamp(38px,4.6vw,64px);
}
.hero-sub{
  margin:8px auto 0;
  color:#9bb0c9;
  font-size:13.5px;
  letter-spacing:.6px;
  text-shadow:0 2px 18px #04070fdd;
}
.actions{
  display:flex;
  justify-content:center;
  gap:12px;
  margin-top:24px;
  pointer-events:auto;
}
.cta{
  height:48px;
  min-width:166px;
  border-radius:6px;
  display:flex;
  justify-content:space-between;
  align-items:center;
  gap:14px;
  padding:0 21px;
  font-size:14px;
  font-weight:500;
  transition:transform .2s,background .2s,box-shadow .2s,border-color .2s;
}
.cta.primary{
  background:linear-gradient(110deg,#edf9fa,#d6eef5);
  border:1px solid #f1ffff;
  color:#0f1e29;
  box-shadow:0 0 28px #a8e6ed22;
}
.cta.primary:hover{
  transform:translateY(-2px);
  box-shadow:0 0 38px #a8e6ed48;
}
.cta.secondary{
  background:#0a132255;
  border:1px solid #dceaff3b;
  color:#e6ecf8;
  backdrop-filter:blur(12px);
}
.cta.secondary:hover{
  background:#17263888;
  border-color:#a0e7e980;
  transform:translateY(-2px);
}
.models{
  margin:24px 0 0;
  display:flex;
  justify-content:center;
  align-items:center;
  flex-wrap:wrap;
  gap:22px;
  color:#9ca9c0;
  font-size:11.5px;
  letter-spacing:.4px;
}
.models span{display:inline-flex;align-items:center;gap:6px}
.models i{font-size:14px;font-style:normal;color:#64f4d4}
.models .claude{color:#f6c177}
.models .gemini{color:#9cc4ff}
.sequence{
  display:flex;
  justify-content:center;
  gap:8px;
  margin:20px 0 0;
  pointer-events:auto;
}
.step{
  padding:6px 0;
  background:none;
  border:0;
  width:22px;
  height:14px;
  position:relative;
}
.step::after{
  content:"";
  height:2px;
  background:#5e6c8255;
  position:absolute;
  left:0;
  right:0;
  top:6px;
  transition:background .18s,box-shadow .18s;
}
.step[aria-pressed="true"]::after{
  background:#a0e7e9;
  box-shadow:0 0 10px #a0e7e988;
}

/* ---------- Architectural Frame Lines ---------- */
.axis{
  position:absolute;
  z-index:2;
  color:#8c9db35c;
  font-size:8.5px;
  letter-spacing:3px;
  writing-mode:vertical-rl;
  top:42%;
  left:4.5%;
  display:flex;
  align-items:center;
  gap:18px;
}
.axis::before{
  content:"";
  height:44px;
  width:1px;
  background:linear-gradient(transparent,#7897a944);
}
.coordinate{
  position:absolute;
  z-index:2;
  right:4.5%;
  top:44%;
  color:#8493a766;
  font-size:8.5px;
  letter-spacing:2px;
  line-height:2.4;
  text-align:right;
}
.horizon{
  position:absolute;
  z-index:1;
  bottom:13%;
  left:14%;
  right:14%;
  height:1px;
  background:linear-gradient(90deg,transparent,#abc8e116,transparent);
}

/* ---------- Orbiting Cluster Pills & Telemetry Card ---------- */
.home-constellation{
  position:fixed;
  inset:0;
  z-index:3;
  pointer-events:none;
  opacity:0;
  transition:opacity .28s ease;
}
.home-constellation.visible{
  opacity:1;
}
.home-cluster-pill{
  position:absolute;
  left:0;
  top:0;
  pointer-events:auto;
  display:inline-flex;
  align-items:center;
  gap:6px;
  padding:4px 10px;
  border-radius:999px;
  border:1px solid rgba(160,231,233,0.28);
  background:rgba(7,12,24,0.72);
  backdrop-filter:blur(8px);
  color:#dbe9f8;
  font-size:11px;
  white-space:nowrap;
  transition:border-color .2s,background .2s;
  will-change:transform;
}
.home-cluster-pill:hover,
.home-cluster-pill.active{
  border-color:#64f4d4;
  background:rgba(14,28,52,0.92);
  box-shadow:0 0 18px rgba(100,244,212,0.25);
}
.home-cluster-dot{
  width:6px;
  height:6px;
  border-radius:50%;
  background:var(--c-color,#64f4d4);
  box-shadow:0 0 8px var(--c-color,#64f4d4);
}
.home-cluster-count{
  color:#8ea4c2;
  font-size:10px;
}

.home-star-card{
  position:fixed;
  right:4.5%;
  bottom:68px;
  z-index:7;
  width:min(330px,calc(100vw - 32px));
  padding:14px 16px;
  border-radius:12px;
  border:1px solid rgba(160,231,233,0.24);
  background:rgba(9,15,28,0.82);
  backdrop-filter:blur(16px);
  box-shadow:0 18px 48px rgba(0,0,0,0.48);
  pointer-events:auto;
}
.hsc-head{display:flex;justify-content:space-between;align-items:flex-start;gap:10px}
.hsc-eyebrow{display:block;font-size:9.5px;letter-spacing:1.4px;color:#89a4c2}
.hsc-title{margin:3px 0 0;font-size:14px;font-weight:600;color:#f2f7ff}
.hsc-pill{font-size:11px;padding:2px 8px;border-radius:999px;background:rgba(100,244,212,0.1);border:1px solid rgba(100,244,212,0.25)}
.hsc-desc{margin:8px 0;font-size:11.5px;color:#9bb0c9}
.hsc-grid{display:grid;grid-template-columns:1fr 1fr;gap:7px;margin-top:8px}
.hsc-grid div{padding:6px 8px;border-radius:7px;background:rgba(255,255,255,0.03);border:1px solid rgba(255,255,255,0.05)}
.hsc-grid span{display:block;font-size:10px;color:#8296b2}
.hsc-grid strong{display:block;margin-top:2px;font-size:11.5px;color:#e6f1ff;font-weight:600}
.hsc-foot{margin-top:10px;padding-top:8px;border-top:1px solid rgba(255,255,255,0.07);display:flex;justify-content:space-between;align-items:center;font-size:11px;color:#89a4c2}
.hsc-foot a{color:#a0e7e9;font-weight:500}

/* ---------- Footer ---------- */
.home-footer{
  position:absolute;
  z-index:6;
  bottom:24px;
  left:5%;
  right:5%;
  display:flex;
  justify-content:space-between;
  align-items:center;
  color:#8b97ad99;
  font-size:10.5px;
  letter-spacing:.8px;
  pointer-events:auto;
}
.signature{
  display:flex;
  align-items:center;
  gap:11px;
}
.signature::before{
  content:"";
  height:1px;
  width:25px;
  background:#9fbac460;
}
.signature b{
  font-size:10px;
  font-weight:500;
  letter-spacing:3.5px;
  color:#b8cade;
}
.foot-actions{
  display:flex;
  align-items:center;
  gap:16px;
}
.motion-state{
  color:#95adc2;
  font-size:10.5px;
}
.dock-button{
  border:1px solid #dceaff24;
  background:#ffffff06;
  color:#b6cade;
  border-radius:999px;
  padding:4px 11px;
  font-size:10.5px;
  transition:.2s;
}
.dock-button:hover,.dock-button.active{
  border-color:#a0e7e966;
  color:#e8f7fa;
  background:#a0e7e914;
}
.motion{
  border:0;
  background:none;
  color:#a1b7c5;
  font-size:10.5px;
  display:flex;
  align-items:center;
  gap:8px;
  padding:6px 0;
  letter-spacing:1px;
}
.motion i{
  height:5px;
  width:5px;
  border-radius:50%;
  background:#64f4d4;
  box-shadow:0 0 8px #64f4d488;
}
.motion[aria-pressed="true"] i{
  background:#708296;
  box-shadow:none;
}
.leave-immersion{
  position:fixed;
  bottom:28px;
  left:50%;
  transform:translateX(-50%);
  z-index:20;
  padding:9px 20px;
  border-radius:999px;
  border:1px solid #a0e7e955;
  background:#091224dd;
  backdrop-filter:blur(12px);
  color:#e8f6ff;
  font-size:12px;
}

/* ---------- Day Theme (Warm Ivory Ink Particle Field) ---------- */
:root[data-theme="day"]{
  color-scheme:light;
  --bg:#fcfaf6;
  --text:#302216;
  --muted:#78614c;
  --line:#78523930;
  --cyan:#af4f34;
}
[data-theme="day"] .page{
  background:
    radial-gradient(ellipse at 45% 28%,#ffffffb8,transparent 65%),
    linear-gradient(170deg,#fcfaf6 20%,#fbf9f5 70%,#f7f3ed 100%);
}
[data-theme="day"] .ambient{background:radial-gradient(ellipse at 49% 54%,#b9945b0a,transparent 62%)}
[data-theme="day"] .grain{opacity:.018;mix-blend-mode:multiply}
[data-theme="day"] .vignette{
  background:
    linear-gradient(180deg,#ffffff30,transparent 25%,transparent 78%,#c8bda306),
    radial-gradient(ellipse at 50% 46%,transparent 28%,#c5b99d08 100%);
}
[data-theme="day"] .brand-name{color:#493222}
[data-theme="day"] .brand-tag{color:#78614c;border-left-color:#78523930}
[data-theme="day"] .group{color:#78614c}
[data-theme="day"] .group span{color:#593d28}
[data-theme="day"] .console{color:#593d28;border-color:#78523940;background:#fff9ef65}
[data-theme="day"] .console:hover{background:#fff7e9cc;border-color:#27736c80}
[data-theme="day"] .theme-toggle{color:#755032;border-color:#78523940;background:#fff9ef65}
[data-theme="day"] .eyebrow{color:#78614c}
[data-theme="day"] .eyebrow::before{background:#af4f34;box-shadow:0 0 11px #af4f3433}
[data-theme="day"] .headline{color:#302216;text-shadow:0 3px 28px #fffdf8cc}
[data-theme="day"] .headline .accent{color:#d96b27;text-shadow:none}
[data-theme="day"] .hero-sub{color:#6f5843;text-shadow:none}
[data-theme="day"] .cta.primary{background:#f39a50;border-color:#f39a50;color:#302216;box-shadow:0 7px 24px #f39a5026}
[data-theme="day"] .cta.secondary{background:#fff8ed88;border-color:#8a654545;color:#61432c}
[data-theme="day"] .models{color:#745c47}
[data-theme="day"] .models i{color:#27736c}
[data-theme="day"] .step::after{background:#8a65453d}
[data-theme="day"] .step[aria-pressed="true"]::after{background:#af4f34;box-shadow:0 0 9px #af4f3433}
[data-theme="day"] .axis,[data-theme="day"] .coordinate{color:#826b5466}
[data-theme="day"] .home-footer,[data-theme="day"] .motion-state,[data-theme="day"] .motion{color:#6d543f}
[data-theme="day"] .signature b{color:#493222}
[data-theme="day"] .dock-button{color:#5c422f;border-color:#78523938;background:#fff9ef66}
[data-theme="day"] :is(.home-cluster-pill,.home-star-card){background:rgba(255,251,244,.92);color:#2c221a;border-color:#78523938;box-shadow:0 10px 30px #78523924}
[data-theme="day"] .home-cluster-pill:hover,[data-theme="day"] .home-cluster-pill.active{background:#edf4ec;border-color:#27736c66}
[data-theme="day"] :is(.home-cluster-count,.hsc-eyebrow,.hsc-desc,.hsc-grid span,.hsc-foot){color:#725d4b}
[data-theme="day"] :is(.hsc-title,.hsc-grid strong){color:#302216}
[data-theme="day"] .hsc-grid div{background:#78523908;border-color:#7852391a}
[data-theme="day"] .hsc-foot a{color:#23655f}

@media(max-width:760px){
  .home-header{height:82px;padding:0 5%}
  .brand-tag,.axis,.coordinate,.signature span,.motion-state{display:none}
  .hero{top:24%}
  .headline.quality{flex-direction:column}
  .home-star-card{display:none}
}