:root {
    --admin-primary: #0d6efd;
    --admin-sidebar: #212529;
    --admin-sidebar-hover: #495057;
    --admin-bg: #f8f9fa;
}

body {
    background-color: var(--admin-bg);
}

.admin-sidebar {
    min-height: 100vh;
    background-color: var(--admin-sidebar);
    width: 250px;
    position: fixed;
    top: 0;
    left: 0;
    z-index: 1000;
    padding-top: 20px;
}

.admin-sidebar .nav-link {
    color: #fff;
    padding: 12px 20px;
    border-radius: 0;
    margin-bottom: 2px;
}

.admin-sidebar .nav-link:hover,
.admin-sidebar .nav-link.active {
    background-color: var(--admin-sidebar-hover);
    color: #fff;
}

.admin-sidebar .nav-link i {
    margin-right: 10px;
    width: 20px;
}

.admin-main {
    margin-left: 250px;
    padding: 0;
}

.admin-header {
    background-color: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 15px 30px;
    margin-bottom: 30px;
}

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

.stats-card {
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border-radius: 15px;
    padding: 25px;
    margin-bottom: 20px;
    border: none;
}

.stats-card.success {
    background: linear-gradient(135deg, #11998e 0%, #38ef7d 100%);
}

.stats-card.warning {
    background: linear-gradient(135deg, #f093fb 0%, #f5576c 100%);
}

.stats-card.info {
    background: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
}

.admin-table {
    background: white;
    border-radius: 10px;
    overflow: hidden;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}

.admin-table th {
    background-color: #f8f9fa;
    border: none;
    font-weight: 600;
    color: #495057;
}

.admin-table td {
    border: none;
    vertical-align: middle;
}

.admin-table tbody tr {
    border-bottom: 1px solid #f8f9fa;
}

.admin-table tbody tr:hover {
    background-color: #f8f9fa;
}

.sidebar-brand {
    color: #fff;
    font-size: 1.2rem;
    font-weight: bold;
    padding: 0 20px 30px;
    border-bottom: 1px solid #495057;
    margin-bottom: 20px;
}

.sidebar-brand i {
    margin-right: 10px;
    color: var(--admin-primary);
}