:root{color-scheme:light}*{box-sizing:border-box}body{margin:0;font-family:Inter,Arial,sans-serif;background:#f7f7f8;color:#111827}main{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:24px}.card{width:100%;max-width:420px;background:#fff;border-radius:12px;border:1px solid #e5e7eb;padding:20px}button,input{width:100%;padding:12px;border-radius:8px;font-size:14px}input{border:1px solid #d1d5db}button{border:none;background:#111827;color:white;cursor:pointer}button:disabled{opacity:.6;cursor:not-allowed}.muted{color:#6b7280}.error,.muted{font-size:14px}.error{color:#b91c1c}