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

body {
    font-family: 'Roboto', sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.header {
    background: linear-gradient(135deg, #1976d2 0%, #1565c0 100%);
    color: white;
    padding: 16px 24px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: sticky;
    top: 0;
    z-index: 100;
}

.header h1 {
    font-size: 24px;
    font-weight: 400;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

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

.nav-menu ul {
    list-style: none;
    display: flex;
    margin: 0;
    padding: 0;
}

.nav-menu li {
    flex: 1;
}

.nav-menu a {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 8px;
    padding: 16px;
    text-decoration: none;
    color: #1976d2;
    font-weight: 500;
    transition: all 0.3s ease;
    border-bottom: 3px solid transparent;
}

.nav-menu a:hover, .nav-menu a.active {
    background-color: #e3f2fd;
    border-bottom-color: #1976d2;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 24px;
}

.card {
    background: white;
    border-radius: 8px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    margin-bottom: 24px;
    overflow: hidden;
}

.card-header {
    padding: 20px 24px;
    border-bottom: 1px solid #e0e0e0;
    background-color: #fafafa;
}

.card-title {
    font-size: 20px;
    font-weight: 500;
    color: #333;
    margin: 0;
    display: flex;
    align-items: center;
    gap: 12px;
}

.card-content {
    padding: 24px;
}

.btn {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    padding: 12px 24px;
    border: none;
    border-radius: 4px;
    font-size: 14px;
    font-weight: 500;
    cursor: pointer;
    text-decoration: none;
    transition: all 0.3s ease;
    box-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

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

.btn-primary:hover {
    background-color: #1565c0;
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.btn-success {
    background-color: #388e3c;
    color: white;
}

.btn-success:hover {
    background-color: #2e7d32;
}

.btn-warning {
    background-color: #f57c00;
    color: white;
}

.btn-warning:hover {
    background-color: #ef6c00;
}

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

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

.btn-small {
    padding: 8px 16px;
    font-size: 12px;
}

.form-group {
    margin-bottom: 20px;
}

.form-label {
    display: block;
    margin-bottom: 8px;
    font-weight: 500;
    color: #555;
}

.form-control {
    width: 100%;
    padding: 12px 16px;
    border: 2px solid #e0e0e0;
    border-radius: 4px;
    font-size: 16px;
    transition: border-color 0.3s ease;
    background-color: white;
}

.form-control:focus {
    outline: none;
    border-color: #1976d2;
    box-shadow: 0 0 0 3px rgba(25,118,210,0.1);
}

.table-responsive {
    overflow-x: auto;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    border-radius: 8px;
}

.table {
    width: 100%;
    border-collapse: collapse;
    background: white;
}

.table th {
    background-color: #1976d2;
    color: white;
    padding: 16px;
    text-align: left;
    font-weight: 500;
    border: none;
}

.table td {
    padding: 16px;
    border-bottom: 1px solid #e0e0e0;
}

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

.icon {
    width: 24px;
    height: 24px;
    display: inline-block;
    vertical-align: middle;
}

.status-badge {
    padding: 4px 12px;
    border-radius: 16px;
    font-size: 12px;
    font-weight: 500;
}

.status-pending {
    background-color: #fff3e0;
    color: #f57c00;
}

.status-processing {
    background-color: #e3f2fd;
    color: #1976d2;
}

.status-completed {
    background-color: #e8f5e8;
    color: #388e3c;
}

.grid {
    display: grid;
    gap: 24px;
}

.grid-2 {
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

.grid-3 {
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
}

.alert {
    padding: 16px;
    border-radius: 4px;
    margin-bottom: 20px;
}

.alert-success {
    background-color: #e8f5e8;
    border-left: 4px solid #388e3c;
    color: #2e7d32;
}

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

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

.modal-content {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    background: white;
    border-radius: 8px;
    padding: 24px;
    max-width: 500px;
    width: 90%;
    max-height: 80vh;
    overflow-y: auto;
}

@media (max-width: 768px) {
    .nav-menu ul {
        flex-direction: column;
    }
    
    .container {
        padding: 0 16px;
    }
    
    .card-content {
        padding: 16px;
    }
    
    .table th, .table td {
        padding: 12px 8px;
        font-size: 14px;
    }
}