body {
            margin: 0;
            padding: 0;
            display: flex;
            justify-content: center;
            align-items: center;
            min-height: 100vh;
            background: linear-gradient(135deg, #1A2B3C 0%, #243B55 100%);
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
        }

        .login-container {
            background: white;
            border-radius: 8px;
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
            width: 100%;
            max-width: 400px;
            padding: 40px;
        }

        .login-header {
            text-align: center;
            margin-bottom: 30px;
        }

        .login-header img {
            max-width: 240px;
            width: 100%;
            height: auto;
            display: block;
            margin: 0 auto;
        }

        .login-header p {
            margin: 10px 0 0 0;
            color: #999;
            font-size: 14px;
        }

        .form-group {
            margin-bottom: 20px;
        }

        .form-group label {
            display: block;
            margin-bottom: 8px;
            color: #333;
            font-size: 14px;
            font-weight: 500;
        }

        .form-group input {
            width: 100%;
            padding: 12px 14px;
            border: 1px solid #ddd;
            border-radius: 6px;
            font-size: 14px;
            box-sizing: border-box;
            transition: border-color 0.3s;
        }

        .form-group input:focus {
            outline: none;
            border-color: #4DC94B;
            box-shadow: 0 0 0 3px rgba(77, 201, 75, 0.15);
        }

        .login-btn {
            width: 100%;
            padding: 12px;
            background: linear-gradient(135deg, #4DC94B 0%, #38A83C 100%);
            color: white;
            border: none;
            border-radius: 6px;
            font-size: 16px;
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.2s, box-shadow 0.2s;
            margin-top: 10px;
        }

        .login-btn:hover {
            transform: translateY(-2px);
            box-shadow: 0 5px 20px rgba(77, 201, 75, 0.35);
        }

        .login-btn:active {
            transform: translateY(0);
        }

        .login-btn:disabled {
            opacity: 0.6;
            cursor: not-allowed;
        }

        .error-message {
            color: #e74c3c;
            font-size: 13px;
            margin-top: 5px;
            display: none;
        }

        .demo-info {
            text-align: center;
            margin-top: 20px;
            padding-top: 20px;
            border-top: 1px solid #eee;
            font-size: 12px;
            color: #999;
        }

        .loading {
            display: none;
        }

.login-link {
    display: block;
    text-align: center;
    margin-top: 18px;
    font-size: 13px;
    color: #2b7bd6;
    text-decoration: underline;
    background: none;
    border: none;
    cursor: pointer;
    font-family: inherit;
    width: 100%;
}

.login-link:hover { color: #1a5aa6; }

.login-view h2 {
    margin: 0 0 8px 0;
    font-size: 18px;
    color: #1A2B3C;
    text-align: center;
}

.login-intro {
    margin: 0 0 20px 0;
    font-size: 13.5px;
    color: #5b6573;
    line-height: 1.5;
    text-align: center;
}

.info-message {
    background: #eef8ee;
    border: 1px solid #bfe3bf;
    color: #256b2d;
    border-radius: 6px;
    padding: 10px 12px;
    font-size: 13px;
    line-height: 1.5;
    margin-bottom: 16px;
    display: none;
}

.form-group .tbpw-box { margin-top: 10px; }