/* Variables */
:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --success-color: #2ecc71;
    --danger-color: #e74c3c;
    --warning-color: #f1c40f;
    --info-color: #3498db;
}

/* Body */
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

/* Navigation */
.navbar {
    background-color: var(--primary-color) !important;
}

.navbar-brand {
    color: white !important;
    font-weight: bold;
}

.nav-link {
    color: white !important;
}

.nav-link:hover {
    color: var(--secondary-color) !important;
}

/* Cards */
.card {
    border: none;
    border-radius: 10px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.card-header {
    background-color: var(--primary-color);
    color: white;
    border-bottom: none;
    border-radius: 10px 10px 0 0;
}

/* Tables */
.table {
    background-color: white;
    box-shadow: 0 2px 4px rgba(0, 0, 0, 0.05);
}

/* Buttons */
.btn-primary {
    background-color: var(--secondary-color);
    border-color: var(--secondary-color);
}

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

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

/* Dashboard Stats */
.stat-card {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    padding: 20px;
    border-radius: 10px;
    height: 100%;
}

.stat-number {
    font-size: 2em;
    font-weight: bold;
    margin-bottom: 10px;
}

/* Responsive Design */
@media (max-width: 768px) {
    .stat-card {
        margin-bottom: 20px;
    }
}