:root {
    --primary-color: #3498db;
    --secondary-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f39c12;
    --info-color: #1abc9c;
    --dark-color: #2c3e50;
    --light-color: #ecf0f1;
    --sidebar-width: 250px;
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f5f7fa;
    color: #333;
}

/* Navbar */
.navbar {
    box-shadow: 0 2px 4px rgba(0,0,0,.1);
}

.navbar-brand {
    font-weight: 700;
    font-size: 1.5rem;
    color: white !important;
}

.navbar-dark .navbar-nav .nav-link {
    color: rgba(255,255,255,.8);
    font-weight: 500;
    transition: color 0.3s;
}

.navbar-dark .navbar-nav .nav-link:hover,
.navbar-dark .navbar-nav .nav-link.active {
    color: white;
}

/* Cards */
.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0,0,0,.1);
    transition: transform 0.3s, box-shadow 0.3s;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 20px rgba(0,0,0,.1);
}

.card-header {
    background-color: transparent;
    border-bottom: 1px solid rgba(0,0,0,.05);
    font-weight: 600;
}

/* Buttons */
.btn {
    border-radius: 5px;
    font-weight: 500;
    transition: all 0.3s;
}

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

.btn-primary:hover {
    background-color: #2980b9;
    border-color: #2980b9;
}

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

.btn-success:hover {
    background-color: #27ae60;
    border-color: #27ae60;
}

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

.btn-danger:hover {
    background-color: #c0392b;
    border-color: #c0392b;
}

.btn-warning {
    background-color: var(--warning-color);
    border-color: var(--warning-color);
    color: #fff;
}

.btn-warning:hover {
    background-color: #e67e22;
    border-color: #e67e22;
    color: #fff;
}

/* Forms */
.form-control, .form-select {
    border-radius: 5px;
    border: 1px solid #ddd;
    padding: 10px 15px;
    transition: border-color 0.3s, box-shadow 0.3s;
}

.form-control:focus, .form-select:focus {
    border-color: var(--primary-color);
    box-shadow: 0 0 0 0.2rem rgba(52, 152, 219, 0.25);
}

/* Tables */
.table {
    margin-bottom: 0;
}

.table thead th {
    background-color: #f8f9fa;
    border-bottom: 2px solid #dee2e6;
    font-weight: 600;
    color: var(--dark-color);
}

.table-hover tbody tr:hover {
    background-color: rgba(0,0,0,.02);
}

/* Dashboard Cards */
.dashboard-card {
    border-radius: 10px;
    color: white;
    padding: 20px;
    margin-bottom: 20px;
    transition: transform 0.3s;
}

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

.dashboard-card.primary {
    background: linear-gradient(45deg, var(--primary-color), #5dade2);
}

.dashboard-card.success {
    background: linear-gradient(45deg, var(--secondary-color), #58d68d);
}

.dashboard-card.info {
    background: linear-gradient(45deg, var(--info-color), #48c9b0);
}

.dashboard-card.warning {
    background: linear-gradient(45deg, var(--warning-color), #f5b041);
}

.dashboard-card h4 {
    font-size: 2rem;
    font-weight: 700;
    margin-bottom: 5px;
}

.dashboard-card p {
    font-size: 1rem;
    opacity: 0.9;
}

.dashboard-card i {
    font-size: 3rem;
    opacity: 0.7;
}

/* Login Container */
.login-container {
    padding-top: 100px;
    padding-bottom: 50px;
    background: linear-gradient(135deg, #f5f7fa 0%, #c3cfe2 100%);
    min-height: 100vh;
}

.login-card {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0,0,0,.1);
}

.login-header {
    background: linear-gradient(45deg, var(--primary-color), #5dade2);
    color: white;
    padding: 30px;
    text-align: center;
}

.login-header h2 {
    margin: 0;
    font-weight: 700;
}

.login-body {
    padding: 30px;
}

/* Notifications */
.notification-badge {
    position: absolute;
    top: -5px;
    right: -5px;
    background-color: var(--danger-color);
    color: white;
    border-radius: 50%;
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 12px;
    font-weight: bold;
}

/* Charts */
.chart-container {
    position: relative;
    height: 300px;
    width: 100%;
}

/* Footer */
.footer {
    background-color: var(--dark-color);
    color: white;
    padding: 20px 0;
    margin-top: 50px;
}

/* Responsive */
@media (max-width: 768px) {
    .dashboard-card {
        margin-bottom: 15px;
    }
    
    .chart-container {
        height: 250px;
    }
}