:root {
    --primary-color: #2c3e50;
    --secondary-color: #3498db;
    --accent-color: #e74c3c;
    --text-color: #333;
    --light-bg: #f8f9fa;
}

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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    line-height: 1.6;
    color: var(--text-color);
}

header {
    background-color: #2c3e50;
    padding: 1rem 0;
}

nav ul {
    list-style: none;
    display: flex;
    justify-content: center;
    gap: 2rem;
}

nav a {
    color: white;
    text-decoration: none;
    font-weight: bold;
    transition: color 0.3s ease;
}

nav a:hover {
    color: #3498db;
}

main {
    max-width: 1200px;
    margin: 2rem auto;
    padding: 0 1rem;
}

h1 {
    color: #2c3e50;
    margin-bottom: 1rem;
    text-align: center;
}

footer {
    background-color: #2c3e50;
    color: white;
    text-align: center;
    padding: 1rem 0;
    position: fixed;
    bottom: 0;
    width: 100%;
}

.card {
    border: none;
    border-radius: 10px;
}

.btn-primary {
    background-color: var(--primary-color);
    border-color: var(--primary-color);
    padding: 10px 20px;
    font-weight: 500;
}

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

.form-control {
    padding: 12px;
    border-radius: 5px;
    border: 1px solid #ddd;
}

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

/* Dashboard Styles */
.dashboard-card {
    transition: transform 0.3s ease;
}

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

/* Table Styles */
.table thead th {
    background-color: var(--primary-color);
    color: white;
    border: none;
}

/* Form Styles */
.form-label {
    font-weight: 500;
    color: var(--primary-color);
}

/* Custom Scrollbar */
::-webkit-scrollbar {
    width: 8px;
}

::-webkit-scrollbar-track {
    background: var(--light-bg);
}

::-webkit-scrollbar-thumb {
    background: var(--primary-color);
    border-radius: 4px;
}

/* Responsive Adjustments */
@media (max-width: 768px) {
    .container {
        padding: 15px;
    }
}