:root {
            --primary: #5b7a91;
            --secondary: #7f8c8d;
            --success: #6b8e7e;
            --info: #7a9cad;
            --warning: #bfa97a;
            --danger: #a26a6a;
            --light: #f5f6f7;
            --dark: #2e3a43;
        }

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

        .login-wrapper {
            width: 100%;
            max-width: 420px;
            padding: 20px;
        }

        .login-container {
            background: white;
            border-radius: 8px;
            box-shadow: 0 8px 32px rgba(46, 58, 67, 0.15);
            padding: 45px;
            border-top: 4px solid var(--primary);
        }

        .login-header {
            text-align: center;
            margin-bottom: 35px;
        }

        .login-logo {
            margin-bottom: 20px;
        }

        .login-logo img {
            max-height: 50px;
            width: auto;
        }

        .login-header h1 {
            font-size: 26px;
            font-weight: 700;
            color: var(--dark);
            margin-bottom: 8px;
            letter-spacing: -0.5px;
        }

        .login-header p {
            color: var(--secondary);
            font-size: 13px;
            margin: 0;
        }

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

        .form-group label {
            font-weight: 600;
            color: var(--dark);
            margin-bottom: 6px;
            display: block;
            font-size: 13px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
        }

        .form-control {
            border: 1px solid #e0e0e0;
            border-radius: 4px;
            padding: 10px 12px;
            font-size: 14px;
            transition: all 0.3s ease;
            background-color: #fafbfc;
        }

        .form-control:focus {
            border-color: var(--primary);
            background-color: white;
            box-shadow: 0 0 0 3px rgba(91, 122, 145, 0.1);
            outline: none;
        }

        .form-control::placeholder {
            color: #999;
        }

        .btn-login {
            background-color: var(--primary);
            border: none;
            color: white;
            font-weight: 600;
            padding: 11px 16px;
            border-radius: 4px;
            width: 100%;
            transition: all 0.3s ease;
            font-size: 14px;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            margin-top: 8px;
        }

        .btn-login:hover {
            background-color: #4a6478;
            color: white;
            text-decoration: none;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(91, 122, 145, 0.25);
        }

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

        .alert {
            margin-bottom: 20px;
            border-radius: 4px;
            border: none;
            font-size: 13px;
        }

        .alert-danger {
            background-color: #fef5f5;
            color: var(--danger);
            border-left: 4px solid var(--danger);
        }

        .alert-success {
            background-color: #f5faf8;
            color: var(--success);
            border-left: 4px solid var(--success);
        }

        .btn-close {
            opacity: 0.5;
            transition: opacity 0.2s;
        }

        .btn-close:hover {
            opacity: 0.8;
        }

        @media (max-width: 480px) {
            .login-container {
                padding: 30px 20px;
            }

            .login-header h1 {
                font-size: 22px;
            }
        }