:root{color-scheme:light;font-family:system-ui,-apple-system,Segoe UI,Roboto,sans-serif;line-height:1.5}body{margin:0;background:#f6f7f9;color:#111}a{color:inherit}main{max-width:960px;margin:0 auto;padding:1.5rem}nav{display:flex;gap:1rem;padding:1rem 1.5rem;background:#fff;border-bottom:1px solid #e5e7eb}nav a{text-decoration:none;font-weight:600}.card{background:#fff;border:1px solid #e5e7eb;border-radius:8px;padding:1.25rem}.form{display:flex;flex-direction:column;gap:.75rem;max-width:360px}.form input{padding:.5rem .75rem;border:1px solid #d1d5db;border-radius:6px}.form button{padding:.6rem .75rem;border:none;border-radius:6px;background:#111827;color:#fff;font-weight:600;cursor:pointer}.form button:disabled{opacity:.6;cursor:not-allowed}.error{color:#b91c1c;font-size:.875rem}