* { box-sizing: border-box; margin: 0; padding: 0; }

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: #f0f2f5;
            display: flex;
            align-items: center;
            justify-content: center;
            min-height: 100vh;
        }

        .login-card {
            background: #fff;
            border-radius: 8px;
            box-shadow: 0 2px 16px rgba(0,0,0,0.12);
            padding: 40px 36px;
            width: 360px;
        }

        .login-card h1 {
            font-size: 22px;
            font-weight: 600;
            color: #1a1a2e;
            margin-bottom: 6px;
        }

        .login-card p.subtitle {
            font-size: 13px;
            color: #888;
            margin-bottom: 28px;
        }

        .form-group {
            margin-bottom: 18px;
        }

        .form-group label {
            display: block;
            font-size: 13px;
            font-weight: 500;
            color: #444;
            margin-bottom: 6px;
        }

        .form-group input {
            width: 100%;
            padding: 10px 12px;
            border: 1px solid #d1d5db;
            border-radius: 6px;
            font-size: 14px;
            color: #333;
            transition: border-color 0.2s;
            outline: none;
        }

        .form-group input:focus {
            border-color: #4f6ef7;
            box-shadow: 0 0 0 3px rgba(79,110,247,0.12);
        }

        .btn-login {
            width: 100%;
            padding: 11px;
            background: #4f6ef7;
            color: #fff;
            border: none;
            border-radius: 6px;
            font-size: 15px;
            font-weight: 500;
            cursor: pointer;
            transition: background 0.2s;
            margin-top: 6px;
        }

        .btn-login:hover {
            background: #3a57d4;
        }

        .alert-error {
            background: #fff0f0;
            border: 1px solid #f5c2c2;
            color: #c0392b;
            border-radius: 6px;
            padding: 10px 14px;
            font-size: 13px;
            margin-bottom: 18px;
        }