.sidebar {
    background: linear-gradient(
        180deg,
        #111827 0%,
        #1f2937 100%
    );
}


/* Menu sidebar */
.sidebar .nav-link {
    color:#cbd5e1;
    font-size:14px;
    padding:8px 14px;
    margin:4px 10px;
    border-radius:12px;
    display:flex;
    align-items:center;
    transition:all .2s ease;
}


/* Icon */
.sidebar .nav-link i {
    width:20px;
    margin-right:8px;
}


/* Menu đang chọn */
.sidebar .nav-item.active .nav-link {
    background:#2563eb;
    color:#fff;
    font-weight:600;
    border-radius:12px;
    box-shadow:0 5px 15px rgba(37,99,235,.35);
}


/* Hover */
.sidebar .nav-link:hover {
    background:#2563eb;
    color:white;
    border-radius:12px;
}


/* Tiêu đề nhóm */
.sidebar-heading {
    color:#64748b;
    font-size:11px;
    text-transform:uppercase;
    letter-spacing:1px;
}

.sidebar {
    border-top-right-radius:20px;
    border-bottom-right-radius:20px;
    overflow:hidden;
}


.sidebar-brand {
    padding:20px 0;
}


.sidebar-divider {
    border-color:rgba(255,255,255,0.1);
}


/* Logo */
.ucp-logo {
    width:150px;
    height:auto;
    padding:10px;
}


/* Card dashboard */
.dashboard-card {
    border:0;
    border-radius:18px;
    box-shadow:0 8px 25px rgba(0,0,0,0.06);
    overflow:hidden;
}


.dashboard-card .card-header {
    background:#fff;
    border-bottom:1px solid #eef2f7;
    font-weight:700;
    color:#2d6cdf;
}


.dashboard-card .card-body {
    background:#fff;
}


/* Card thống kê */
.stat-card {
    border:0;
    border-radius:18px;
    box-shadow:0 8px 25px rgba(0,0,0,0.06);
    min-height:120px;
}


/* Cảnh báo bảo mật */
.security-alert {
    border-radius:16px;
    background:linear-gradient(135deg,#fff5f3,#fff);
    border:1px solid #ffe1db;
    padding:20px;
}


/* Button */
.quick-link-btn {
    border-radius:12px;
}


iframe {
    max-width:100%;
}