:root{--bg:#0b1020;--card:#151c2f;--text:#e8eefc;--muted:#9aa8c7;--warn:#ffd166;--ok:#5dde9e;--bad:#ff6b7a}
*{box-sizing:border-box}body{margin:0;font-family:system-ui,-apple-system,Segoe UI,sans-serif;background:radial-gradient(900px 500px at 15% -10%,#1a2748,var(--bg));color:var(--text)}
main{max-width:880px;margin:0 auto;padding:22px 16px 48px}h1{margin:0 0 6px;font-size:1.5rem}.sub{color:var(--muted);margin:0 0 14px}
.banner{padding:12px 14px;border-radius:12px;font-weight:600;margin-bottom:14px}
.banner.warn{background:#3a2f12;color:var(--warn);border:1px solid #6a5418}
.card{background:var(--card);border:1px solid #24304d;border-radius:16px;padding:14px;margin-bottom:12px}
.stage{min-height:220px;background:#070b16;border-radius:12px;display:flex;align-items:center;justify-content:center;text-align:center;color:var(--muted);padding:16px;line-height:1.5}
.row{display:flex;flex-wrap:wrap;gap:8px;margin-top:12px}
button{border:0;border-radius:10px;padding:11px 14px;font-weight:600;background:#2a3348;color:#c9d4ef}
button:disabled{opacity:.45;cursor:not-allowed}
.muted{color:var(--muted);font-size:.92rem}
pre{background:#070b16;border-radius:10px;padding:12px;overflow:auto;font:12px/1.4 ui-monospace,Menlo,monospace}