body {
        background: #0f172a;
        color: #f1f5f9;
        min-height: 100vh;
    }
    .navbar-custom {
        background: #1e293b;
        border-bottom: 1px solid #334155;
        padding: 1rem 0;
    }
    .navbar-brand {
        font-weight: 700;
        font-size: 1.5rem;
        color: #f1f5f9 !important;
        display: flex;
        align-items: center;
        gap: 0.75rem;
    }
    .brand-icon {
        width: 40px;
        height: 40px;
        background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
        border-radius: 10px;
        display: flex;
        align-items: center;
        justify-content: center;
        font-size: 1.3rem;
    }
    .nav-link {
        color: #94a3b8 !important;
        font-weight: 500;
        padding: 0.5rem 1rem !important;
        border-radius: 8px;
    }
    .nav-link:hover {
        color: #f1f5f9 !important;
    }
    .content {
        padding: 2rem 0;
        min-height: calc(100vh - 200px);
    }
    .footer-custom {
        background: #1e293b;
        border-top: 1px solid #334155;
        padding: 1.5rem 0;
        margin-top: 3rem;
        color: #94a3b8;
    }
    /* Alert Messages Styling */
    .alert {
        border-radius: 12px;
        border: none;
        font-weight: 500;
        box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    }
    .alert-success {
        background: rgba(34, 197, 94, 0.15);
        color: #4ade80;
        border-left: 4px solid #22c55e;
    }
    .alert-error, .alert-danger {
        background: rgba(239, 68, 68, 0.15);
        color: #f87171;
        border-left: 4px solid #ef4444;
    }
    .alert-warning {
        background: rgba(251, 146, 60, 0.15);
        color: #fb923c;
        border-left: 4px solid #f59e0b;
    }
    .alert-info {
        background: rgba(59, 130, 246, 0.15);
        color: #60a5fa;
        border-left: 4px solid #3b82f6;
    }
    .alert .btn-close {
        filter: brightness(0) invert(1);
        opacity: 0.6;
    }
    .alert .btn-close:hover {
        opacity: 1;
    }