:root {
    --primary-color: #1890FF;
    --primary-dark: #096dd9;
    --success-color: #52c41a;
    --warning-color: #faad14;
    --danger-color: #f5222d;
    --info-color: #13c2c2;
    --bg-gray: #f5f7fa;
    --card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
}

* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background-color: var(--bg-gray);
    min-height: 100vh;
}

body.bg-gradient-primary {
    background: linear-gradient(135deg, var(--primary-color) 0%, #69c0ff 100%);
    min-height: 100vh;
}

.card {
    border-radius: 10px;
}

.card-header {
    font-weight: 600;
}

.card-body {
    padding: 1.5rem;
}

.card.bg-gradient-primary,
.card.bg-gradient-info,
.card.bg-gradient-success,
.card.bg-gradient-warning,
.card.bg-gradient-danger,
.card.bg-gradient-secondary {
    height: 120px !important;
    max-height: 120px !important;
    min-height: 120px !important;
    overflow: hidden !important;
    margin-bottom: 1rem !important;
    box-sizing: border-box !important;
    flex-shrink: 0 !important;
    flex-grow: 0 !important;
}

.col-xl-3 > .card.bg-gradient-primary,
.col-lg-6 > .card.bg-gradient-primary,
.col-xl-3 > .card.bg-gradient-info,
.col-lg-6 > .card.bg-gradient-info,
.col-xl-3 > .card.bg-gradient-success,
.col-lg-6 > .card.bg-gradient-success,
.col-xl-3 > .card.bg-gradient-warning,
.col-lg-6 > .card.bg-gradient-warning,
.col-xl-3 > .card.bg-gradient-danger,
.col-lg-6 > .card.bg-gradient-danger,
.col-xl-3 > .card.bg-gradient-secondary,
.col-lg-6 > .card.bg-gradient-secondary {
    height: 120px !important;
    max-height: 120px !important;
    min-height: 120px !important;
    overflow: hidden !important;
}

.row:first-child > .col-xl-3:first-child > .card.bg-gradient-primary {
    height: 120px !important;
    max-height: 120px !important;
    min-height: 120px !important;
    overflow: hidden !important;
    display: block !important;
}

.row > div > .card.bg-gradient-primary,
.row > div > .card.bg-gradient-info,
.row > div > .card.bg-gradient-success,
.row > div > .card.bg-gradient-warning,
.row > div > .card.bg-gradient-danger,
.row > div > .card.bg-gradient-secondary {
    height: 120px !important;
    max-height: 120px !important;
    min-height: 120px !important;
    overflow: hidden !important;
}

.card.bg-gradient-primary .card-body,
.card.bg-gradient-info .card-body,
.card.bg-gradient-success .card-body,
.card.bg-gradient-warning .card-body,
.card.bg-gradient-danger .card-body,
.card.bg-gradient-secondary .card-body {
    padding: 0.75rem !important;
    height: 100% !important;
    min-height: auto !important;
    max-height: none !important;
    display: flex !important;
    align-items: center !important;
    margin: 0 !important;
}

.card.bg-gradient-primary,
.card.bg-gradient-info,
.card.bg-gradient-success,
.card.bg-gradient-warning,
.card.bg-gradient-danger,
.card.bg-gradient-secondary {
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
}

.card.bg-gradient-info {
    background: linear-gradient(135deg, var(--info-color) 0%, #08979c 100%);
}

.card.bg-gradient-success {
    background: linear-gradient(135deg, var(--success-color) 0%, #389e0d 100%);
}

.card.bg-gradient-warning {
    background: linear-gradient(135deg, var(--warning-color) 0%, #d48806 100%);
}

.card.bg-gradient-danger {
    background: linear-gradient(135deg, var(--danger-color) 0%, #cf1322 100%);
}

.card.bg-gradient-secondary {
    background: linear-gradient(135deg, #6c757d 0%, #495057 100%);
}

.icon-circle {
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
}

.font-bold {
    font-weight: 700;
}

.text-white-80 {
    color: rgba(255, 255, 255, 0.8);
}

.text-white-60 {
    color: rgba(255, 255, 255, 0.6);
}

.rounded-10 {
    border-radius: 10px;
}

.shadow-lg {
    box-shadow: 0 10px 40px rgba(0, 0, 0, 0.15);
}

.sidebar {
    min-height: calc(100vh - 100px);
    padding-top: 1rem;
}

.sidebar .nav-link {
    color: #666;
    padding: 0.75rem 1rem;
    border-radius: 8px;
    margin-bottom: 0.25rem;
    transition: all 0.2s;
}

.sidebar .nav-link:hover {
    background-color: rgba(24, 144, 255, 0.1);
    color: var(--primary-color);
}

.sidebar .nav-link.active {
    background-color: var(--primary-color);
    color: white;
}

.sidebar-heading {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    box-shadow: var(--card-shadow);
}

.stat-value {
    font-size: 2rem;
    font-weight: 700;
}

.stat-label {
    color: #666;
    font-size: 0.875rem;
}

.admin-body {
    background-color: #f0f2f5;
    min-height: 100vh;
}

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

.admin-sidebar {
    width: 250px;
    background: #001529;
    color: white;
    position: fixed;
    height: 100vh;
    overflow-y: auto;
}

.admin-sidebar .sidebar-header {
    padding: 1.5rem;
    border-bottom: 1px solid #1f3a5f;
    font-size: 1.1rem;
}

.admin-sidebar .sidebar-nav ul {
    list-style: none;
    padding: 1rem;
}

.admin-sidebar .sidebar-nav li {
    margin-bottom: 0.25rem;
}

.admin-sidebar .sidebar-nav a {
    display: flex;
    align-items: center;
    padding: 0.75rem 1rem;
    color: rgba(255, 255, 255, 0.8);
    text-decoration: none;
    border-radius: 8px;
    transition: all 0.2s;
}

.admin-sidebar .sidebar-nav a:hover {
    background: rgba(255, 255, 255, 0.1);
    color: white;
}

.admin-sidebar .sidebar-nav li.active a {
    background: var(--primary-color);
    color: white;
}

.admin-sidebar .sidebar-nav i {
    margin-right: 0.75rem;
}

.admin-main {
    margin-left: 250px;
    flex: 1;
    padding: 2rem;
}

.admin-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 2rem;
}

.admin-header h1 {
    font-size: 1.75rem;
    font-weight: 600;
}

.admin-stat-card {
    background: white;
    padding: 1.5rem;
    border-radius: 10px;
    display: flex;
    align-items: center;
    color: white;
}

.admin-stat-card .stat-icon {
    width: 60px;
    height: 60px;
    background: rgba(255, 255, 255, 0.2);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
    margin-right: 1rem;
}

.admin-stat-card .stat-info {
    flex: 1;
}

.admin-stat-card .stat-value {
    font-size: 1.75rem;
    font-weight: 700;
}

.admin-stat-card .stat-label {
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.875rem;
}

.checkbox-inline {
    display: block;
    margin-bottom: 0.25rem;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.btn-primary:hover {
    background-color: var(--primary-dark);
    border-color: var(--primary-dark);
}

.table th,
.table td {
    vertical-align: middle;
}

.pagination .page-link {
    color: var(--primary-color);
}

.pagination .page-item.active .page-link {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
}

.form-select:focus,
.form-control:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(24, 144, 255, 0.2);
}

.alert {
    border-radius: 8px;
}

@media (max-width: 768px) {
    .admin-sidebar {
        width: 100%;
        position: relative;
        height: auto;
    }
    
    .admin-main {
        margin-left: 0;
        padding: 1rem;
    }
    
    .admin-header {
        flex-direction: column;
        align-items: flex-start;
        gap: 1rem;
    }
    
    .card.bg-gradient-primary,
    .card.bg-gradient-info,
    .card.bg-gradient-success,
    .card.bg-gradient-warning,
    .card.bg-gradient-danger,
    .card.bg-gradient-secondary {
        margin-bottom: 1rem;
    }
}

@media (max-width: 992px) {
    .sidebar {
        display: none;
    }
}