:root {
        --primary-blue: #003366;
        --accent-blue: #0056b3;
        --light-gray: #f8f9fa;
    }

    .custom-header {
        background-color: var(--primary-blue);
        color: white;
        padding: 1rem 2rem;
        display: flex;
        justify-content: space-between;
        align-items: center;
        box-shadow: 0 2px 5px rgba(0,0,0,0.2);
        font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    }

    .header-left {
        display: flex;
        align-items: center;
        gap: 20px;
    }

    .logo {
        height: 50px;
        width: auto;
        border-radius: 4px;
    }

    .titles h1 { margin: 0; font-size: 1.5rem; color: #ffffff; }
    .titles h2 { margin: 0; font-size: 1.1rem; color: #d1d1d1; font-weight: 400; }
    .titles h3 { margin: 0; font-size: 0.9rem; color: #a0c4ff; font-weight: 300; }

    .header-right {
        display: flex;
        align-items: center;
    }

    .logout-btn {
        background-color: #dc3545;
        color: white;
        text-decoration: none;
        padding: 8px 18px;
        border-radius: 4px;
        font-weight: bold;
        transition: background 0.3s;
    }

    .logout-btn:hover {
        background-color: #c82333;
        box-shadow: 0 2px 4px rgba(0,0,0,0.3);
    }