:root{--red:#b91c1c;--blue:#1e3a8a;--white:#fff;--gray:#334155}
body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;background:#f8fafc;margin:0;padding:16px}
h1,h2,h3{margin:0 0 10px}
.container{max-width:1100px;margin:auto}
.btn{background:var(--blue);color:#fff;text-decoration:none;padding:8px 12px;margin-right:8px;border-radius:12px;display:inline-block}
.btn-secondary{background:var(--red)}
.card{background:#fff;border:1px solid #e5e7eb;border-radius:14px;padding:14px;margin:12px 0}
.alert.ok{background:#ecfdf5;color:#065f46;border:1px solid #a7f3d0;padding:10px;border-radius:10px;margin:10px 0}
.alert.err{background:#fef2f2;color:#b91c1c;border:1px solid #fecaca;padding:10px;border-radius:10px;margin:10px 0}
table{width:100%;border-collapse:collapse}
th,td{border:1px solid #e5e7eb;padding:8px}
th{background:#e2e8f0}