*{box-sizing:border-box}
:root{
  --bg:#040606;
  --card:rgba(10,14,16,0.72);
  --text:#f2f2f2;
  --muted:#c3c3c3;
  --line:rgba(255,255,255,0.14);
  --btn:#0f1417;
  --accent:#0f1d19;
  --accentLine:#1a3b31;
}
html,body{height:100%}
body{
  margin:0;
  font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
  color:var(--text);
  background:
    radial-gradient(900px 500px at 50% 0%, rgba(16,62,45,0.55) 0%, rgba(0,0,0,0) 60%),
    radial-gradient(1200px 700px at 20% 20%, rgba(18,55,43,0.38) 0%, rgba(0,0,0,0) 60%),
    radial-gradient(900px 650px at 80% 30%, rgba(12,38,30,0.32) 0%, rgba(0,0,0,0) 60%),
    linear-gradient(180deg, #050607, #030404 60%, #020303);
}
.wrap{max-width:980px;margin:0 auto;padding:18px}
.kicker{letter-spacing:0.18em;font-weight:700;font-size:12px;color:rgba(255,255,255,0.85)}
.diac{white-space:nowrap}
.landing{min-height:calc(100vh - 36px);display:grid;place-items:center}
.landing-inner{width:min(860px, 100%);border-radius:22px;padding:26px 18px;background:linear-gradient(180deg, rgba(255,255,255,0.06), rgba(255,255,255,0.02));border:1px solid var(--line);box-shadow:0 20px 80px rgba(0,0,0,0.45)}
.brand{max-width:760px;margin:0 auto}
h1{margin:10px 0 10px;font-family:ui-serif, Georgia, 'Times New Roman', Times, serif;font-weight:600;font-size:34px;letter-spacing:0.02em}
.lead{margin:0 0 18px;color:rgba(255,255,255,0.82);line-height:1.55;font-size:15px;max-width:58ch}
.card{margin-top:16px;background:var(--card);border:1px solid var(--line);border-radius:18px;padding:14px;backdrop-filter: blur(10px)}
.hidden{display:none !important}
.top{display:flex;gap:14px;align-items:flex-end;justify-content:space-between;margin:6px 0 12px}
.h2{margin:8px 0 0;font-family:ui-serif, Georgia, 'Times New Roman', Times, serif;font-weight:600;letter-spacing:0.02em}
.sub{margin:6px 0 0;color:rgba(255,255,255,0.72);font-size:13px;line-height:1.35}
.controls{display:flex;flex-wrap:wrap;gap:10px;align-items:center;justify-content:space-between;margin-bottom:12px}
.seg{display:flex;gap:10px;flex-wrap:wrap}
.btn{appearance:none;border:1px solid rgba(255,255,255,0.16);background:var(--btn);color:var(--text);padding:10px 12px;border-radius:12px;font-weight:650;font-size:13px;cursor:pointer}
.btn input{display:none}
.btn.primary{background:var(--accent);border-color:var(--accentLine)}
.btn.ghost{background:transparent}
.btn:disabled{opacity:.45;cursor:not-allowed}
.stage{display:grid;place-items:center;padding:10px;border-radius:14px;border:1px dashed rgba(255,255,255,0.16);background:rgba(0,0,0,0.18)}
canvas{width:min(92vw,720px);height:auto;border-radius:14px}
.hint{margin:10px 0 0;color:rgba(255,255,255,0.68);font-size:12px;text-align:center}
.tiny{margin:10px 0 0;color:rgba(255,255,255,0.66);font-size:12px}
.advanced{margin-top:12px;border-top:1px solid rgba(255,255,255,0.12);padding-top:10px}
.advanced summary{cursor:pointer;color:rgba(255,255,255,0.74);font-weight:650}
.grid{display:grid;grid-template-columns:1fr;gap:10px;margin:10px 0}
.grid label{display:flex;flex-direction:column;gap:6px;color:rgba(255,255,255,0.72);font-size:12px}
.grid input{padding:10px 10px;border-radius:12px;border:1px solid rgba(255,255,255,0.16);background:#0b0e10;color:var(--text)}
@media(min-width:720px){.grid{grid-template-columns:repeat(3,1fr)}}