:root {
    --primary: #667eea;
    --secondary: #764ba2;
    --success: #10b981;
    --danger: #ef4444;
    --warning: #f59e0b;
    --info: #06b6d4;
    --dark: #1f2937;
    --light: #f9fafb;
}

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

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    position: fixed;
    left: 0;
    top: 0;
    height: 100vh;
    width: 260px;
    background: white;
    box-shadow: 2px 0 10px rgba(0,0,0,0.1);
    z-index: 1000;
    overflow-y: auto;
}

.sidebar-header {
    padding: 25px 20px;
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

.sidebar-header h3 {
    font-size: 1.5rem;
    font-weight: 700;
    margin: 0;
}

.sidebar-header p {
    font-size: 0.85rem;
    opacity: 0.9;
    margin: 5px 0 0 0;
}

.nav-menu {
    padding: 20px 0;
}

.nav-item {
    margin: 5px 15px;
}

.nav-link {
    display: flex;
    align-items: center;
    padding: 12px 15px;
    color: var(--dark);
    text-decoration: none;
    border-radius: 10px;
    transition: all 0.3s;
    font-weight: 500;
}

.nav-link:hover,
.nav-link.active {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
    transform: translateX(5px);
}

.nav-link i {
    width: 25px;
    margin-right: 12px;
    font-size: 1.1rem;
}

/* Main Content */
.main-content {
    margin-left: 260px;
    padding: 30px;
    min-height: 100vh;
}

.page-content {
    display: none;
}

.page-content.active {
    display: block;
}

.page-header {
    background: white;
    padding: 25px 30px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    margin-bottom: 30px;
}

.page-header h1 {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
    margin: 0;
}

.page-header p {
    color: #666;
    margin: 5px 0 0 0;
}

/* Stats Cards */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 20px;
    margin-bottom: 30px;
}

.stat-card {
    background: white;
    padding: 25px;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    transition: transform 0.3s;
}

.stat-card:hover {
    transform: translateY(-5px);
}

.stat-card-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 15px;
}

.stat-card-title {
    font-size: 0.9rem;
    color: #666;
    font-weight: 600;
    text-transform: uppercase;
}

.stat-card-icon {
    width: 50px;
    height: 50px;
    border-radius: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 1.5rem;
}

.stat-card-value {
    font-size: 2rem;
    font-weight: 700;
    color: var(--dark);
}

.stat-card-footer {
    margin-top: 10px;
    font-size: 0.85rem;
}

/* Card */
.card {
    background: white;
    border-radius: 15px;
    box-shadow: 0 5px 20px rgba(0,0,0,0.1);
    overflow: hidden;
}

.card-header {
    padding: 20px 25px;
    border-bottom: 1px solid #e5e7eb;
}

.card-header h3 {
    font-size: 1.3rem;
    font-weight: 700;
    color: var(--dark);
    margin: 0;
}

.card-body {
    padding: 25px;
}

/* Quick Actions */
.quick-actions {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.quick-actions .btn {
    padding: 15px 25px;
    font-weight: 600;
    border-radius: 10px;
    border: none;
    transition: all 0.3s;
}

.quick-actions .btn:hover {
    transform: translateY(-3px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.btn-primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
    color: white;
}

.btn-success {
    background: linear-gradient(135deg, var(--success) 0%, #059669 100%);
    color: white;
}

.btn-info {
    background: linear-gradient(135deg, var(--info) 0%, #0891b2 100%);
    color: white;
}

.btn-warning {
    background: linear-gradient(135deg, var(--warning) 0%, #d97706 100%);
    color: white;
}

.btn-danger {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
    color: white;
}

/* Table */
table {
    width: 100%;
    border-collapse: collapse;
}

table thead {
    background: #f9fafb;
}

table th {
    padding: 15px;
    text-align: left;
    font-weight: 600;
    color: var(--dark);
    border-bottom: 2px solid #e5e7eb;
}

table td {
    padding: 15px;
    border-bottom: 1px solid #e5e7eb;
}

table tr:hover {
    background: #f9fafb;
}

/* Badge */
.badge {
    padding: 5px 12px;
    border-radius: 20px;
    font-size: 0.85rem;
    font-weight: 600;
}

.badge-success {
    background: #d1fae5;
    color: #065f46;
}

.badge-danger {
    background: #fee2e2;
    color: #991b1b;
}

.badge-warning {
    background: #fef3c7;
    color: #92400e;
}

.badge-info {
    background: #cffafe;
    color: #164e63;
}

/* Utilities */
.text-success {
    color: var(--success);
}

.text-danger {
    color: var(--danger);
}

.text-warning {
    color: var(--warning);
}

.text-muted {
    color: #6b7280;
}

.mt-4 {
    margin-top: 2rem;
}