html, body {
    height: 100%;
    background-color: #f5f7fb;
}

body {
    margin: 0;
    font-size: 0.95rem;
    color: #212529;
}

.admin-shell {
    min-height: 100vh;
    display: flex;
}

.admin-sidebar {
    width: 260px;
    min-width: 260px;
    background: #212529;
    color: #fff;
    display: flex;
    flex-direction: column;
    box-shadow: 0 0 20px rgba(0, 0, 0, .08);
    position: relative;
    z-index: 1040;
    transition: transform .25s ease;
}

.admin-brand {
    padding: 1.25rem;
    border-bottom: 1px solid rgba(255, 255, 255, .08);
    font-size: 1.1rem;
    font-weight: 700;
    letter-spacing: .2px;
}

    .admin-brand a {
        color: #fff;
        text-decoration: none;
    }

.sidebar-section-title {
    font-size: .75rem;
    text-transform: uppercase;
    letter-spacing: .08em;
    color: rgba(255, 255, 255, .55);
    padding: 1rem 1.25rem .5rem;
}

.sidebar-nav {
    padding: 0 .75rem 1rem;
}

    .sidebar-nav .nav-link {
        color: rgba(255, 255, 255, .82);
        border-radius: .75rem;
        padding: .75rem .9rem;
        display: flex;
        align-items: center;
        gap: .65rem;
        margin-bottom: .25rem;
        transition: all .15s ease;
    }

        .sidebar-nav .nav-link:hover {
            background: rgba(255, 255, 255, .08);
            color: #fff;
        }

        .sidebar-nav .nav-link.active {
            background: #fd7e14;
            color: #fff;
            font-weight: 600;
        }

.admin-main {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
}

.admin-topbar {
    height: 70px;
    background: #fff;
    border-bottom: 1px solid #e9ecef;
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 1.5rem;
}

.admin-topbar-title {
    font-size: 1.15rem;
    font-weight: 700;
    margin: 0;
}

.admin-topbar-subtitle {
    font-size: .85rem;
    color: #6c757d;
    margin: 0;
}

.admin-content {
    padding: 1.5rem;
}

.content-card {
    background: #fff;
    border: 1px solid #edf0f4;
    border-radius: 1rem;
    box-shadow: 0 4px 20px rgba(15, 23, 42, 0.04);
    padding: 1.25rem;
}

.admin-footer {
    padding: 1rem 1.5rem 1.5rem;
    color: #6c757d;
    font-size: .85rem;
}

.admin-sidebar-backdrop {
    display: none;
}

@media (max-width: 991.98px) {
    .admin-sidebar {
        position: fixed;
        top: 0;
        left: 0;
        height: 100vh;
        transform: translateX(-100%);
    }

        .admin-sidebar.is-open {
            transform: translateX(0);
        }

    .admin-sidebar-backdrop {
        display: block;
        position: fixed;
        inset: 0;
        background: rgba(0, 0, 0, .35);
        opacity: 0;
        visibility: hidden;
        transition: all .2s ease;
        z-index: 1030;
    }

        .admin-sidebar-backdrop.is-visible {
            opacity: 1;
            visibility: visible;
        }

    .admin-content {
        padding: 1rem;
    }

    .admin-topbar {
        padding: 0 1rem;
    }
}