/* Material Design inspired styles */
* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', Oxygen, Ubuntu, Cantarell, sans-serif;
    background: #f5f5f5;
    color: #212121;
    line-height: 1.6;
}

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

.card {
    background: white;
    border-radius: 4px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    padding: 24px;
    margin-bottom: 16px;
}

.btn {
    display: inline-block;
    padding: 10px 24px;
    font-size: 14px;
    font-weight: 500;
    text-transform: uppercase;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
    text-decoration: none;
    text-align: center;
}

.btn-primary {
    background: #1976d2;
    color: white;
}

.btn-primary:hover {
    background: #1565c0;
}

.btn-secondary {
    background: #757575;
    color: white;
}

.btn-secondary:hover {
    background: #616161;
}

.btn-danger {
    background: #d32f2f;
    color: white;
}

.btn-danger:hover {
    background: #c62828;
}

.btn-small {
    padding: 6px 12px;
    font-size: 12px;
}

.form-group {
    margin-bottom: 16px;
}

.form-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 14px;
    font-weight: 500;
    color: #424242;
}

.form-control {
    width: 100%;
    padding: 12px;
    font-size: 16px;
    border: 1px solid #bdbdbd;
    border-radius: 4px;
    transition: border-color 0.2s;
}

.form-control:focus {
    outline: none;
    border-color: #1976d2;
}

.form-control.error {
    border-color: #d32f2f;
}

textarea.form-control {
    resize: vertical;
    min-height: 80px;
}

.checkbox-group {
    display: flex;
    align-items: center;
    gap: 8px;
}

.checkbox-group input[type="checkbox"] {
    width: 18px;
    height: 18px;
    cursor: pointer;
}

.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 16px;
}

.table th,
.table td {
    padding: 12px;
    text-align: left;
    border-bottom: 1px solid #e0e0e0;
}

.table th {
    font-weight: 500;
    color: #757575;
    font-size: 12px;
    text-transform: uppercase;
}

.table tr:hover {
    background: #f5f5f5;
}

.alert {
    padding: 12px 16px;
    border-radius: 4px;
    margin-bottom: 16px;
}

.alert-error {
    background: #ffebee;
    color: #c62828;
    border-left: 4px solid #d32f2f;
}

.alert-success {
    background: #e8f5e9;
    color: #2e7d32;
    border-left: 4px solid #4caf50;
}

.alert-info {
    background: #e3f2fd;
    color: #1565c0;
    border-left: 4px solid #2196f3;
}

.nav {
    background: white;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 24px;
}

.nav-content {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 16px 24px;
}

.nav-links {
    display: flex;
    gap: 24px;
}

.nav-links a {
    color: #424242;
    text-decoration: none;
    font-weight: 500;
    padding: 8px 0;
    border-bottom: 2px solid transparent;
    transition: border-color 0.2s;
}

.nav-links a:hover,
.nav-links a.active {
    border-bottom-color: #1976d2;
    color: #1976d2;
}

.modal {
    display: none;
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0,0,0,0.5);
    z-index: 1000;
    align-items: center;
    justify-content: center;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: white;
    border-radius: 4px;
    padding: 24px;
    max-width: 600px;
    width: 90%;
    max-height: 90vh;
    overflow-y: auto;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 24px;
}

.modal-header h2 {
    margin: 0;
}

.close-btn {
    background: none;
    border: none;
    font-size: 24px;
    cursor: pointer;
    color: #757575;
}

.close-btn:hover {
    color: #424242;
}

.modal-footer {
    display: flex;
    justify-content: flex-end;
    gap: 8px;
    margin-top: 24px;
}

.loading {
    text-align: center;
    padding: 40px;
    color: #757575;
}

@media (max-width: 768px) {
    .container {
        padding: 12px;
    }
    
    .card {
        padding: 16px;
    }
    
    .nav-content {
        flex-direction: column;
        gap: 16px;
    }
    
    .nav-links {
        flex-direction: column;
        gap: 12px;
        width: 100%;
    }
    
    .table {
        font-size: 14px;
    }
    
    .table th,
    .table td {
        padding: 8px;
    }
}