:root{--bg:#070b14;--panel:#0d1422;--panel2:#111b2d;--line:#22304a;--text:#f4f7fb;--muted:#8e9bb1;--blue:#5b8cff;--blue2:#7ca4ff;--green:#62d9a1}
*{box-sizing:border-box}body{margin:0;background:radial-gradient(circle at 80% 0%,#172b52 0,#0a101d 32%,var(--bg) 65%);color:var(--text);font-family:Inter,ui-sans-serif,system-ui,-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;min-height:100vh}
body:before{content:"";position:fixed;inset:0;pointer-events:none;background-image:linear-gradient(rgba(255,255,255,.025) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.025) 1px,transparent 1px);background-size:42px 42px}
.topbar{height:72px;border-bottom:1px solid rgba(255,255,255,.08);display:flex;align-items:center;justify-content:space-between;padding:0 6vw;position:relative;z-index:2;background:rgba(7,11,20,.65);backdrop-filter:blur(14px)}
.brand{color:var(--text);font-weight:800;text-decoration:none;letter-spacing:-.02em}.brand span{margin-right:9px}.github{color:#b9c6db;text-decoration:none;font-size:14px}.github:hover{color:#fff}
.shell{max-width:1180px;margin:auto;padding:70px 24px 40px}.hero{max-width:820px}.eyebrow{font-size:11px;letter-spacing:.18em;color:var(--blue2);font-weight:800;margin-bottom:18px}.hero h1{font-size:clamp(46px,7vw,82px);line-height:.96;letter-spacing:-.06em;margin:0}.hero h1 span{color:var(--blue2)}.hero p{max-width:650px;color:var(--muted);font-size:18px;line-height:1.65;margin:26px 0}.hero-actions{display:flex;gap:12px;flex-wrap:wrap}.primary,.secondary{border:0;border-radius:10px;padding:13px 18px;font-weight:750;cursor:pointer;font-size:14px}.primary{background:var(--blue);color:white}.secondary{background:#151f31;color:#d9e2f2;border:1px solid var(--line)}
.workspace{display:grid;grid-template-columns:260px 1fr;gap:16px;margin-top:58px;background:rgba(9,14,24,.78);border:1px solid rgba(255,255,255,.08);border-radius:18px;padding:14px;box-shadow:0 30px 80px rgba(0,0,0,.25)}
.sidebar{padding:8px}.side-label{font-size:10px;letter-spacing:.18em;color:#64738b;font-weight:800;padding:14px 12px}.nav{width:100%;border:0;background:transparent;color:#9eabc0;display:flex;align-items:center;gap:13px;text-align:left;padding:13px 12px;border-radius:9px;cursor:pointer;margin:3px 0}.nav b{font-size:10px;color:#56657d}.nav span{font-weight:650}.nav.active,.nav:hover{background:#152238;color:#fff}.nav.active b{color:var(--blue2)}
.panel{background:var(--panel);border:1px solid var(--line);border-radius:13px;padding:30px;min-height:430px}.tool-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-start;margin-bottom:28px}.tool-kicker{font-size:11px;color:var(--blue2);letter-spacing:.14em;font-weight:800}.tool-title{font-size:30px;letter-spacing:-.04em;margin:7px 0}.tool-copy{color:var(--muted);margin:0;line-height:1.6}.badge{font-size:11px;border:1px solid #254332;color:var(--green);background:#0c1c16;padding:7px 10px;border-radius:99px;white-space:nowrap}
.form-grid{display:grid;grid-template-columns:repeat(2,1fr);gap:15px}.field label{display:block;color:#8290a8;font-size:12px;margin-bottom:7px}.field input,.field select{width:100%;background:#080e18;border:1px solid #293750;color:#fff;border-radius:9px;padding:13px;font-size:16px;outline:none}.field input:focus,.field select:focus{border-color:var(--blue)}.action{margin-top:18px;background:var(--blue);color:#fff;border:0;border-radius:9px;padding:13px 18px;font-weight:750;cursor:pointer}.result{margin-top:24px;padding:20px;border:1px solid #293750;background:#080e18;border-radius:11px;min-height:66px}.result .label{color:#75849c;font-size:11px;text-transform:uppercase;letter-spacing:.12em}.result .value{font-size:24px;font-weight:800;margin-top:5px}.result.success{border-color:#24523e}.result.error{border-color:#5c2d38;color:#ffb4c0}
.concepts{display:grid;grid-template-columns:repeat(4,1fr);margin-top:18px;border:1px solid rgba(255,255,255,.08);border-radius:13px;background:rgba(12,18,30,.6);overflow:hidden}.concepts div{padding:18px;border-right:1px solid rgba(255,255,255,.07)}.concepts div:last-child{border:0}.concepts span{display:block;color:#52627a;font-size:10px;margin-bottom:12px}.concepts strong{display:block}.concepts small{display:block;color:#718097;margin-top:4px}footer{text-align:center;color:#5e6b81;font-size:12px;padding:22px 0 36px}
@media(max-width:800px){.workspace{grid-template-columns:1fr}.sidebar{display:grid;grid-template-columns:repeat(2,1fr)}.side-label{grid-column:1/-1}.panel{padding:22px}.concepts{grid-template-columns:repeat(2,1fr)}.concepts div:nth-child(2){border-right:0}.hero h1{font-size:54px}}
@media(max-width:500px){.topbar{padding:0 20px}.github{display:none}.shell{padding:45px 16px 25px}.form-grid{grid-template-columns:1fr}.concepts{grid-template-columns:1fr}.concepts div{border-right:0;border-bottom:1px solid rgba(255,255,255,.07)}.sidebar{grid-template-columns:1fr}}