:root{color-scheme:light dark;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}body{margin:0;min-height:100vh;background:#0f172a;color:#f8fafc}main{max-width:420px;margin:4rem auto}.card,main{padding:1.5rem}.card{background:#1e293b;border-radius:12px;box-shadow:0 10px 40px rgba(0,0,0,.35)}label{display:block;font-size:.875rem;margin-bottom:.25rem;color:#cbd5e1}input{width:100%;box-sizing:border-box;padding:.6rem .75rem;margin-bottom:1rem;border-radius:8px;border:1px solid #334155;background:#0f172a;color:#f8fafc}button{width:100%;padding:.75rem;border:none;border-radius:8px;background:#0891b2;color:#fff;font-weight:600;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}.error{color:#fca5a5;margin-bottom:1rem}.error,.muted{font-size:.875rem}.muted{color:#94a3b8}