:root {
    --mint-green: #98c9a8;
    --olive-green: #6b8e4c;
    --soft-mint: #d1e9d9;
    --dark-olive: #4a6b3a;
    --white: #ffffff;
    --light-gray: #f5f5f5;
    --text-dark: #333333;
}

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

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

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
}

.header {
    background-color: var(--mint-green);
    color: var(--text-dark);
    padding: 1rem 2rem;
    border-radius: 8px;
    margin-bottom: 2rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.header h1 {
    color: var(--dark-olive);
}

.nav-menu {
    background-color: var(--olive-green);
    padding: 1rem;
    border-radius: 8px;
    margin-bottom: 2rem;
}

.nav-menu a {
    color: white;
    text-decoration: none;
    padding: 0.5rem 1rem;
    margin: 0 0.5rem;
    border-radius: 4px;
    transition: background-color 0.3s;
}

.nav-menu a:hover {
    background-color: var(--dark-olive);
}

.card {
    background: var(--white);
    border-radius: 8px;
    padding: 1.5rem;
    margin-bottom: 1.5rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

.card-header {
    border-bottom: 2px solid var(--mint-green);
    padding-bottom: 1rem;
    margin-bottom: 1rem;
    color: var(--dark-olive);
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.5rem;
    color: var(--dark-olive);
    font-weight: 500;
}

.form-control {
    width: 100%;
    padding: 0.75rem;
    border: 1px solid var(--mint-green);
    border-radius: 4px;
    font-size: 1rem;
}

.form-control:focus {
    outline: none;
    border-color: var(--olive-green);
    box-shadow: 0 0 5px var(--mint-green);
}

.btn {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 4px;
    font-size: 1rem;
    cursor: pointer;
    transition: background-color 0.3s;
    text-decoration: none;
}

.btn-primary {
    background-color: var(--olive-green);
    color: white;
}

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

.btn-secondary {
    background-color: var(--mint-green);
    color: var(--text-dark);
}

.btn-secondary:hover {
    background-color: var(--soft-mint);
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: var(--white);
    border-radius: 8px;
    overflow: hidden;
}

.table th {
    background-color: var(--mint-green);
    color: var(--dark-olive);
    font-weight: 600;
    padding: 1rem;
    text-align: left;
}

.table td {
    padding: 1rem;
    border-bottom: 1px solid var(--soft-mint);
}

.table tr:hover {
    background-color: var(--soft-mint);
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--white);
    padding: 1.5rem;
    border-radius: 8px;
    text-align: center;
    border-left: 4px solid var(--olive-green);
}

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

.stat-label {
    color: var(--text-dark);
    margin-top: 0.5rem;
}

.alert {
    padding: 1rem;
    border-radius: 4px;
    margin-bottom: 1rem;
}

.alert-success {
    background-color: #d4edda;
    color: #155724;
    border: 1px solid #c3e6cb;
}

.alert-error {
    background-color: #f8d7da;
    color: #721c24;
    border: 1px solid #f5c6cb;
}

@media print {
    .nav-menu, .btn, .form-group, .card-header .btn {
        display: none;
    }
    
    .card {
        box-shadow: none;
        border: 1px solid #ddd;
    }
}