*{box-sizing:border-box}body{font-family:system-ui,-apple-system,Segoe UI,Roboto,Ubuntu,Arial,sans-serif;margin:0;background:#f7f7fb;color:#222}.container{max-width:960px;margin:0 auto;padding:16px}.site-header{background:#fff;border-bottom:1px solid #ececf1;position:sticky;top:0}.site-header .brand{font-weight:700;margin-right:16px;text-decoration:none}nav a{margin-right:12px;text-decoration:none;color:#333}.card{background:#fff;border:1px solid #ececf1;border-radius:14px;padding:20px;box-shadow:0 1px 2px rgba(0,0,0,.04)}form{display:block;max-width:520px}label{display:block;margin:10px 0 6px;font-weight:600}input[type=text],input[type=email],input[type=password]{width:100%;padding:10px;border:1px solid #dcdce4;border-radius:10px}button{padding:10px 14px;border:0;border-radius:10px;background:#222;color:#fff;cursor:pointer}.error{background:#ffe8e8;border:1px solid #ffc4c4;color:#b10000;padding:10px;border-radius:8px;margin-bottom:12px}.success{background:#e9ffef;border:1px solid #b8f5c6;color:#096a2e;padding:10px;border-radius:8px;margin-bottom:12px}.grid{display:grid;gap:16px}table{width:100%;border-collapse:collapse}th,td{border-bottom:1px solid #eee;padding:8px;text-align:left}