body {
    min-height: 100vh;
    background: #f4f6fa;
}

.sidebar {
    min-width: 220px;
    max-width: 220px;
    background: linear-gradient(180deg, #1a2332 0%, #22304a 100%);
    color: #fff;
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    padding-top: 2rem;
    z-index: 1000;
    box-shadow: 2px 0 8px rgba(34,48,74,0.08);
}

    .sidebar .navbar-brand {
        color: #fff;
        font-weight: 700;
        font-size: 1.3rem;
        margin-bottom: 2rem;
        letter-spacing: 1px;
    }

    .sidebar .nav-link {
        color: #b8c1d1;
        font-size: 1.07rem;
        margin-bottom: 0.5rem;
        border-left: 4px solid transparent;
        transition: color 0.2s, background 0.2s, border-color 0.2s;
        padding-left: 1.2rem;
    }

        .sidebar .nav-link.active, .sidebar .nav-link:hover {
            color: #fff;
            background: #2d3a54;
            border-left: 4px solid #2563eb;
            border-radius: 0.25rem 0 0 0.25rem;
        }

        .sidebar .nav-link i {
            color: #2563eb;
            margin-right: 0.7rem;
        }

.main-content {
    margin-left: 220px;
    padding: 2rem 1.5rem 0 1.5rem;
    background: #f4f6fa;
    min-height: 100vh;
}

header .badge {
    background: #2563eb;
    color: #fff;
    font-weight: 500;
    letter-spacing: 1px;
}

footer {
    background: #fff;
    border-top: 1px solid #e3e8ee;
    color: #6c757d;
    font-size: 0.97rem;
}

@media (max-width: 768px) {
    .sidebar {
        position: static;
        min-width: 100%;
        max-width: 100%;
        height: auto;
        padding-top: 1rem;
    }

    .main-content {
        margin-left: 0;
        padding: 1rem;
    }
}