:root{
      --bg:#0b0f19; --card:#0e1726; --ink:#e5f6ff; --muted:#9fb3c8; --cyan:#22d3ee;
      --cyan-d:#0ea5e9; --emerald:#34d399; --violet:#a78bfa; --ring:#116b7a; --accent:#12323a;
    }
    *{box-sizing:border-box}
    html,body{height:100%}
    body{margin:0;background:#000;color:var(--ink);font:16px/1.5 system-ui,-apple-system,Segoe UI,Roboto,Inter,Arial,sans-serif}
    .wrap{max-width:1100px;margin:0 auto;padding:24px;position:relative}
    .glow{position:absolute;inset:-120px 0 auto 0;z-index:-1;height:600px;
      background:radial-gradient(600px 300px at 50% 0, rgba(52,211,153,.25), transparent 60%),
                 radial-gradient(450px 260px at 50% 20%, rgba(14,165,233,.18), transparent 70%);}
    .hero{padding:56px 0;text-align:center}
    .badge{display:inline-flex;gap:8px;padding:6px 12px;border-radius:999px;background:rgba(14,165,233,.15);
      border:1px solid rgba(14,165,233,.35);color:#bff4ff;font-weight:600;font-size:12px;backdrop-filter:blur(4px)}
    .title{font-weight:900;line-height:1.1;margin:18px 0;background:linear-gradient(90deg,#aaf0ff,#d4ffe7,#b7fff2);
      -webkit-background-clip:text;background-clip:text;color:transparent;font-size:clamp(32px,6vw,56px)}
    .lead{max-width:760px;margin:0 auto;color:var(--muted);font-size:18px}
    .pills{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:12px}
    .pill{border-radius:999px;background:#0b1a21b3;border:1px solid rgba(14,165,233,.4);padding:6px 10px;color:#7fffd4;
      font-weight:600;font-size:12px}
    .tabs{display:grid;grid-template-columns:repeat(3,1fr);border:1px solid rgba(14,165,233,.3);border-radius:12px;
      overflow:hidden;background:#0b1a21cc;margin:10px auto;max-width:640px}
    .tab{padding:10px 12px;background:transparent;color:#aee9ff;border:0;cursor:pointer;font-weight:600}
    .tab.active{background:rgba(15,118,110,.3);box-shadow:inset 0 0 0 1px rgba(94,234,212,.4)}
    .grid2{display:grid;gap:16px;grid-template-columns:1fr}
    @media (min-width:900px){.grid2{grid-template-columns:1fr 1fr}}
    .card{background:var(--card);border-radius:16px;padding:20px;border:1px solid rgba(14,165,233,.3)}
    .label{color:#bff4ff;font-weight:700;font-size:14px;margin:12px 0 6px}
    .range{width:100%}
    .row{display:flex;justify-content:space-between;align-items:baseline;gap:12px}
    .btn{background:rgba(34,211,238,.25);border:1px solid rgba(34,211,238,.6);color:#d6faff;border-radius:8px;padding:8px 12px;font-weight:700;cursor:pointer}
    .note{background:rgba(245,158,11,.07);color:#fde68a;border:1px solid rgba(245,158,11,.25);border-radius:12px;padding:12px}
    .muted{color:var(--muted)}
    .mono{font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;}
    .result{font-size:28px;font-weight:900;color:#bff6ff}
    .ring{border:1px solid rgba(17,107,122,.5);border-radius:10px;padding:10px;background:#0c1320}
    .bullets{display:grid;gap:8px;margin:0;padding:0;list-style:none}
    .bullet{display:flex;gap:10px;background:#0b1a21b3;border:1px solid rgba(14,165,233,.4);border-radius:12px;padding:10px}
    .dot{width:8px;height:8px;border-radius:50%;background:#34d399;margin-top:6px;flex:0 0 auto}
    .test{background:#0e1322;border:1px solid rgba(14,165,233,.35);border-radius:16px;padding:16px;margin-top:28px}
    .ok{background:rgba(16,185,129,.18);color:#d1fae5;padding:6px 8px;border-radius:8px}
    .fail{background:rgba(244,63,94,.2);color:#fecdd3;padding:6px 8px;border-radius:8px}
    input[type="number"], input[type="text"]{width:100%;background:#0b1220;border:1px solid #334155;color:#e6faff;border-radius:8px;padding:8px}