:root{
  /* palette — from yunsome.com final tokens */
  --brand-300:#5ABAD6; --brand-400:#4AA3CB; --brand-500:#3E8EBD; --brand-600:#2A75AC; --brand-700:#1C5C9A; --brand-900:#0E2F52;
  --grad:linear-gradient(135deg,#5ABAD6 0%,#3E8EBD 45%,#1C5C9A 100%);
  --grad-text:linear-gradient(100deg,#E8EEF4 0%,#9fd8ea 35%,#5ABAD6 60%,#3E8EBD 100%);
  --bg:#060B14; --dark-900:#0B1626; --dark-800:#11233A;
  --on-dark:#E8EEF4; --muted:#9FB1C4; --dim:#61758b;
  --line:rgba(159,177,196,.14); --line-2:rgba(159,177,196,.24);
  --font:"Inter","SF Pro Display",-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,"Helvetica Neue",Arial,sans-serif;
  --mono:"JetBrains Mono","SF Mono",ui-monospace,Menlo,Consolas,monospace;
  --container:1240px; --gutter:clamp(20px,5vw,72px);
  --ease:cubic-bezier(.22,1,.36,1);
}
*{box-sizing:border-box}
html{scroll-behavior:smooth;-webkit-text-size-adjust:100%}
body{margin:0;background:var(--bg);color:var(--on-dark);font-family:var(--font);font-size:16px;line-height:1.65;-webkit-font-smoothing:antialiased;overflow-x:hidden}
a{color:inherit;text-decoration:none}
a:focus-visible,button:focus-visible{outline:2px solid var(--brand-300);outline-offset:3px;border-radius:8px}
::selection{background:rgba(90,186,214,.35)}
.wrap{max-width:var(--container);margin:0 auto;padding:0 var(--gutter)}
.grad-text{background:var(--grad-text);-webkit-background-clip:text;background-clip:text;color:transparent}
.skip{position:absolute;left:-999px;top:8px;z-index:100;padding:8px 14px;border-radius:8px;background:var(--dark-800)}
.skip:focus{left:8px}

/* ---------- header ---------- */
.hdr{position:fixed;inset:0 0 auto;z-index:50;transition:background .3s,border-color .3s;border-bottom:1px solid transparent}
.hdr.scrolled{background:rgba(6,11,20,.96);backdrop-filter:saturate(160%) blur(14px);-webkit-backdrop-filter:saturate(160%) blur(14px);border-color:var(--line)}
.hdr .wrap{height:72px;display:flex;align-items:center;gap:32px}
.logo{display:flex;align-items:center;gap:10px;font-weight:650;font-size:20px;letter-spacing:-.02em}
.logo svg{width:30px;height:30px}
.logo .tld{color:var(--brand-300)}
.logo--sm{font-size:16px}
.nav{display:flex;gap:28px;margin-left:auto;font-size:14px;color:var(--muted)}
.nav a{transition:color .2s}.nav a:hover{color:var(--on-dark)}
.status{display:inline-flex;align-items:center;gap:8px;font-family:var(--mono);font-size:12px;color:var(--muted);padding:6px 12px;border:1px solid var(--line-2);border-radius:999px;background:rgba(11,22,38,.5)}
.dot{width:7px;height:7px;border-radius:50%;background:var(--brand-300);animation:ping 2.2s infinite}
@keyframes ping{0%{box-shadow:0 0 0 0 rgba(90,186,214,.55)}70%{box-shadow:0 0 0 9px rgba(90,186,214,0)}100%{box-shadow:0 0 0 0 rgba(90,186,214,0)}}
@media(max-width:820px){.nav{display:none}.status{margin-left:auto}}

/* ---------- hero (latent sphere) ---------- */
.hero{position:relative;min-height:100vh;min-height:100svh;display:flex;align-items:center;overflow:hidden;isolation:isolate}
.fx{position:absolute;inset:0;width:100%;height:100%;z-index:-2;display:block}
.hero::after{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:linear-gradient(90deg,rgba(6,11,20,.92) 0%,rgba(6,11,20,.55) 42%,rgba(6,11,20,0) 70%),linear-gradient(0deg,var(--bg) 0%,rgba(6,11,20,0) 26%)}
@media(max-width:899px){.hero::after{background:linear-gradient(180deg,rgba(6,11,20,.1) 0%,rgba(6,11,20,.5) 35%,rgba(6,11,20,.2) 70%,var(--bg) 100%)}}
.hero .wrap{width:100%;padding-top:96px;padding-bottom:96px}
.hero-inner{max-width:680px}
.eyebrow{display:inline-flex;align-items:center;gap:10px;font-family:var(--mono);font-size:12px;letter-spacing:.14em;text-transform:uppercase;color:var(--brand-300);padding:7px 14px;border-radius:999px;border:1px solid rgba(90,186,214,.28);background:rgba(90,186,214,.06)}
.eyebrow i{width:18px;height:1px;background:var(--brand-300);display:inline-block}
h1{font-size:clamp(3rem,1.6rem + 6vw,6.4rem);line-height:.98;letter-spacing:-.045em;font-weight:650;margin:28px 0 24px}
.lead{font-size:clamp(1.05rem,1rem + .4vw,1.3rem);color:var(--muted);max-width:580px;margin:0 0 40px;line-height:1.6}
.ctas{display:flex;flex-wrap:wrap;gap:14px}
.btn{display:inline-flex;align-items:center;gap:10px;height:50px;padding:0 24px;border-radius:12px;font-weight:600;font-size:15px;transition:transform .25s var(--ease),box-shadow .25s,background .25s,border-color .25s}
.btn-primary{background:var(--grad);color:#fff;box-shadow:0 10px 30px -10px rgba(62,142,189,.7),inset 0 1px 0 rgba(255,255,255,.25)}
.btn-primary:hover{transform:translateY(-2px);box-shadow:0 16px 40px -12px rgba(90,186,214,.8),inset 0 1px 0 rgba(255,255,255,.3)}
.btn-ghost{border:1px solid var(--line-2);color:var(--on-dark);background:rgba(11,22,38,.4);backdrop-filter:blur(8px)}
.btn-ghost:hover{border-color:rgba(90,186,214,.5);background:rgba(90,186,214,.08)}
.btn svg{width:16px;height:16px;transition:transform .25s var(--ease)}.btn:hover svg{transform:translateX(3px)}
.hero-meta{display:flex;gap:12px 28px;flex-wrap:wrap;margin-top:56px;font-family:var(--mono);font-size:12px;color:var(--dim);letter-spacing:.06em}
.hero-meta b{color:var(--muted);font-weight:500;margin-right:8px}
.scroll-cue{position:absolute;left:50%;bottom:28px;transform:translateX(-50%);width:22px;height:36px;border:1px solid var(--line-2);border-radius:12px}
.scroll-cue::after{content:"";position:absolute;left:50%;top:7px;width:2px;height:7px;margin-left:-1px;background:var(--brand-300);border-radius:2px;animation:cue 1.8s var(--ease) infinite}
@keyframes cue{0%{opacity:0;transform:translateY(0)}30%{opacity:1}100%{opacity:0;transform:translateY(12px)}}

/* ---------- sections ---------- */
section{position:relative}
.sec{padding:clamp(96px,10vw,168px) 0}
.sec--flush-top{padding-top:0}
.kicker{font-family:var(--mono);font-size:12px;letter-spacing:.16em;text-transform:uppercase;color:var(--brand-300);display:flex;align-items:center;gap:12px;margin-bottom:22px}
.kicker::before{content:"";width:28px;height:1px;background:currentColor;opacity:.7}
.kicker--center{justify-content:center}
h2{font-size:clamp(2rem,1.3rem + 2.6vw,3.4rem);line-height:1.06;letter-spacing:-.035em;font-weight:620;margin:0 0 20px;max-width:900px}
.sub{color:var(--muted);font-size:1.08rem;max-width:620px;margin:0}

/* manifesto */
.manifesto{border-top:1px solid var(--line);border-bottom:1px solid var(--line);background:radial-gradient(60% 120% at 50% 0%,rgba(28,92,154,.18),transparent 70%)}
.manifesto p{font-size:clamp(1.7rem,1rem + 2.8vw,3.3rem);line-height:1.22;letter-spacing:-.03em;font-weight:560;margin:0;max-width:1080px}
.manifesto .w{color:rgba(232,238,244,.16);transition:color .6s var(--ease)}
.manifesto .w.on{color:var(--on-dark)}
.manifesto .w.hl.on{color:var(--brand-300)}

/* focus cards */
.cards{display:grid;grid-template-columns:repeat(3,1fr);gap:20px;margin-top:64px}
@media(max-width:960px){.cards{grid-template-columns:1fr}}
.card{position:relative;padding:34px 30px 32px;border-radius:20px;border:1px solid var(--line);background:linear-gradient(180deg,rgba(17,35,58,.55),rgba(11,22,38,.25));overflow:hidden;transition:border-color .4s,transform .5s var(--ease)}
.card::before{content:"";position:absolute;inset:0;border-radius:inherit;padding:1px;background:radial-gradient(400px circle at var(--mx,50%) var(--my,0%),rgba(90,186,214,.55),transparent 45%);-webkit-mask:linear-gradient(#000 0 0) content-box,linear-gradient(#000 0 0);-webkit-mask-composite:xor;mask-composite:exclude;opacity:0;transition:opacity .4s}
.card:hover{transform:translateY(-4px)}.card:hover::before{opacity:1}
.card .glow{position:absolute;width:300px;height:300px;left:var(--mx,50%);top:var(--my,0%);transform:translate(-50%,-50%);background:radial-gradient(circle,rgba(62,142,189,.16),transparent 65%);opacity:0;transition:opacity .4s;pointer-events:none}
.card:hover .glow{opacity:1}
.card-ico{width:56px;height:56px;border-radius:14px;display:grid;place-items:center;background:rgba(90,186,214,.08);border:1px solid rgba(90,186,214,.2);margin-bottom:28px}
.card-ico svg{width:30px;height:30px}
.card h3{font-size:1.32rem;letter-spacing:-.02em;margin:0 0 10px;font-weight:600}
.card p{color:var(--muted);margin:0 0 24px;font-size:.98rem}
.tag{font-family:var(--mono);font-size:11px;letter-spacing:.1em;text-transform:uppercase;color:var(--brand-300);border:1px solid rgba(90,186,214,.25);border-radius:999px;padding:4px 10px}
.idx{position:absolute;right:26px;top:28px;font-family:var(--mono);font-size:12px;color:var(--dim)}

/* approach */
.approach{display:grid;grid-template-columns:1fr 1.05fr;gap:clamp(40px,6vw,96px);align-items:center}
@media(max-width:960px){.approach{grid-template-columns:1fr}}
.steps{list-style:none;padding:0;margin:44px 0 0;display:grid;gap:4px}
.steps li{display:grid;grid-template-columns:44px 1fr;gap:6px 16px;padding:20px 0;border-top:1px solid var(--line)}
.steps li:last-child{border-bottom:1px solid var(--line)}
.steps .n{grid-row:span 2;font-family:var(--mono);font-size:12px;color:var(--brand-300);padding-top:5px}
.steps b{font-weight:600;font-size:1.06rem;letter-spacing:-.01em}
.steps .d{grid-column:2;color:var(--muted);font-size:.96rem}
.trace{border-radius:20px;border:1px solid var(--line-2);background:linear-gradient(180deg,rgba(17,35,58,.7),rgba(11,22,38,.6));box-shadow:0 50px 100px -40px rgba(0,0,0,.8);overflow:hidden}
.trace-hd{display:flex;align-items:center;justify-content:space-between;padding:14px 20px;border-bottom:1px solid var(--line);font-family:var(--mono);font-size:12px;color:var(--dim)}
.trace-hd .live{display:flex;align-items:center;gap:8px;color:var(--muted)}
.trace-bd{padding:22px 20px 26px;font-family:var(--mono);font-size:13px}
.row{display:grid;grid-template-columns:76px 1fr auto;align-items:center;gap:14px;padding:11px 0;opacity:.28;transition:opacity .5s}
.row.on{opacity:1}
.row .k{color:var(--brand-300)}
.row .v{color:var(--on-dark);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}
.row .t{color:var(--dim);font-size:11px}
.bar{grid-column:1/-1;height:3px;border-radius:3px;background:rgba(159,177,196,.1);overflow:hidden;margin-top:6px}
.bar i{display:block;height:100%;width:0;background:var(--grad);border-radius:inherit;transition:width 1.1s var(--ease)}
.row.on .bar i{width:var(--w)}
.w28{--w:28%}.w52{--w:52%}.w74{--w:74%}.w90{--w:90%}.w100{--w:100%}
.trace-ft{display:flex;justify-content:space-between;padding:14px 20px;border-top:1px solid var(--line);font-family:var(--mono);font-size:11px;color:var(--dim)}
.ok{color:#7fe0c3}
@media(max-width:560px){.row{grid-template-columns:60px 1fr}.row .t{display:none}}

/* principles (light) */
.light{background:#F5F7F9;color:#1B1F23}
.light .kicker{color:var(--brand-600)}
.light .sub{color:#5C6366}
.pgrid{display:grid;grid-template-columns:repeat(4,1fr);margin-top:64px;border-top:1px solid #E6E8EB}
@media(max-width:960px){.pgrid{grid-template-columns:1fr 1fr}}
@media(max-width:560px){.pgrid{grid-template-columns:1fr}}
.pgrid div{padding:32px 28px 8px 0}
.pgrid b{display:block;font-size:2.4rem;letter-spacing:-.04em;font-weight:600;background:var(--grad);-webkit-background-clip:text;background-clip:text;color:transparent;line-height:1.1;margin-bottom:14px}
.pgrid h3{margin:0 0 8px;font-size:1.06rem;font-weight:600}
.pgrid p{margin:0;color:#5C6366;font-size:.95rem}

/* contact (neural field) */
.cta{text-align:center;overflow:hidden;isolation:isolate}
.cta::after{content:"";position:absolute;inset:0;z-index:-1;pointer-events:none;
  background:radial-gradient(48% 46% at 50% 50%,rgba(6,11,20,.88) 0%,rgba(6,11,20,.55) 55%,rgba(6,11,20,0) 100%),linear-gradient(180deg,var(--bg) 0%,rgba(6,11,20,0) 18%,rgba(6,11,20,0) 82%,var(--bg) 100%)}
.cta .wrap{position:relative}
.cta h2{margin:0 auto 20px;max-width:820px}
.cta .sub{margin:0 auto 40px}
.cta .ctas{justify-content:center}

/* footer */
footer{border-top:1px solid var(--line);padding:40px 0 48px;color:var(--dim);font-size:13px}
footer .wrap{display:flex;flex-wrap:wrap;gap:16px 32px;align-items:center;justify-content:space-between}
footer nav{display:flex;gap:24px}
footer a:hover{color:var(--on-dark)}

/* 404 */
.nf{min-height:100vh;display:grid;place-items:center;text-align:center;padding:24px}
.nf b{display:block;font-family:var(--mono);color:var(--brand-300);letter-spacing:.16em;margin-bottom:16px}

/* reveal */
.js .rv{opacity:0;transform:translateY(24px);transition:opacity .9s var(--ease),transform .9s var(--ease)}
.js .rv.in{opacity:1;transform:none}
.rv.d1{transition-delay:.08s}.rv.d2{transition-delay:.16s}.rv.d3{transition-delay:.24s}.rv.d4{transition-delay:.32s}
.hero .rv{transition-duration:1.1s}
@media (prefers-reduced-motion:reduce){*,*::before,*::after{animation:none!important;transition:none!important}.js .rv{opacity:1;transform:none}}