:root{--bg:#0b0f10;--card:#111618;--muted:#9aa3ab;--brand:#16a34a}
*{box-sizing:border-box}body{font-family:Inter,ui-sans-serif,system-ui,-apple-system,'Segoe UI',Roboto,'Helvetica Neue',Arial;color:#fff;background:var(--bg);margin:0}
.header{padding:28px 20px;text-align:center}
.logo{width:56px;height:56px;border-radius:10px;display:inline-block;vertical-align:middle;margin-bottom:8px}
.container{max-width:900px;margin:20px auto;padding:0 16px;display:grid;grid-template-columns:1fr;gap:16px}
.card{background:rgba(17,22,24,0.9);padding:18px;border-radius:12px;box-shadow:0 6px 20px rgba(0,0,0,0.4)}
.row{display:flex;gap:8px;align-items:center;margin-top:10px}
.row.small{display:flex;justify-content:space-between;margin-top:12px}
input[type=number]{background:rgba(0,0,0,0.5);border:1px solid rgba(255,255,255,0.04);padding:8px;border-radius:8px;color:#fff;min-width:140px}
button{background:var(--brand);border:none;padding:10px 14px;border-radius:10px;color:#fff;cursor:pointer}
button:disabled{opacity:0.5;cursor:not-allowed}
.muted{color:var(--muted)}
.small{font-size:13px}
.footer{text-align:center;padding:12px;color:var(--muted);opacity:0.9}
code{background:#0b0f10;padding:6px;border-radius:6px;display:inline-block}