body {
    background: #f4f5f7;
    font-family: "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
}

.admin-sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 230px;
    background: #1c2733;
    color: #cfd6dd;
    padding: 20px 0;
    overflow-y: auto;
    z-index: 10;
}

.admin-sidebar .brand {
    color: #fff;
    font-weight: 700;
    font-size: 18px;
    padding: 0 20px 20px;
    display: block;
}

.admin-sidebar a {
    color: #cfd6dd;
    text-decoration: none;
    display: block;
    padding: 10px 20px;
    font-size: 14px;
    transition: all 0.2s ease;
}

.admin-sidebar a:hover,
.admin-sidebar a.active {
    background: #c33;
    color: #fff;
}

.admin-sidebar .sidebar-separator {
    border-top: 1px solid rgba(255,255,255,0.08);
    margin: 16px 0;
}

.admin-content {
    margin-left: 230px;
    padding: 26px 30px;
    min-height: 100vh;
}

.admin-topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: 16px;
    flex-wrap: wrap;
    margin-bottom: 24px;
}

.stat-card,
.card-panel {
    background: #fff;
    border-radius: 10px;
    padding: 20px;
    box-shadow: 0 2px 10px rgba(0,0,0,.05);
}

.stat-card .num {
    font-size: 28px;
    font-weight: 700;
    color: #c33;
}

.thumb {
    width: 56px;
    height: 56px;
    object-fit: cover;
    border-radius: 8px;
}

.admin-sidebar form {
    padding: 0 20px;
}

.admin-logout-button {
    width: 100%;
}

@media (max-width: 991px) {
    .admin-sidebar {
        position: static;
        width: 100%;
        max-height: none;
    }

    .admin-content {
        margin-left: 0;
        padding: 20px 20px 30px;
    }
}

@media (max-width: 767px) {
    .admin-sidebar {
        padding-top: 16px;
    }

    .admin-sidebar a {
        padding: 12px 16px;
        font-size: 15px;
    }

    .admin-topbar {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 575px) {
    .admin-content {
        padding: 18px 15px 26px;
    }

    .admin-sidebar .brand {
        font-size: 16px;
        padding-bottom: 16px;
    }
}