body {
    font-family: Arial, sans-serif;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background-color: #f5f5f5;
}
.container {
    background: white;
    padding: 30px;
    border-radius: 10px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
.upload-section {
    border: 2px dashed #ccc;
    border-radius: 10px;
    padding: 30px;
    text-align: center;
    margin-bottom: 30px;
    background-color: #fafafa;
}
.upload-section.dragover {
    border-color: #007bff;
    background-color: #e3f2fd;
}
.file-input {
    margin: 20px 0;
}
.btn {
    background-color: #007bff;
    color: white;
    padding: 12px 24px;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    margin: 5px;
}
.btn:hover {
    background-color: #0056b3;
}
.btn.success {
    background-color: #28a745;
}
.btn.warning {
    background-color: #ffc107;
    color: #212529;
}
.btn-danger {
    background-color: #dc3545;
    color: white;
}
.btn-danger:hover {
    background-color: #c82333;
}
.btn-sm {
    padding: 6px 12px;
    font-size: 14px;
}
.data-preview {
    margin-top: 30px;
}
.table {
    width: 100%;
    border-collapse: collapse;
    margin-top: 20px;
}
.table th, .table td {
    border: 1px solid #ddd;
    padding: 8px;
    text-align: left;
}
.table th {
    background-color: #f2f2f2;
    font-weight: bold;
}
.success {
    color: #28a745;
    background-color: #d4edda;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}
.error {
    color: #dc3545;
    background-color: #f8d7da;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}
.info {
    color: #17a2b8;
    background-color: #d1ecf1;
    padding: 10px;
    border-radius: 5px;
    margin: 10px 0;
}
.stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 20px;
    margin: 20px 0;
}
.stat-card {
    background: #f8f9fa;
    padding: 20px;
    border-radius: 8px;
    text-align: center;
    border-left: 4px solid #007bff;
}
.stat-number {
    font-size: 24px;
    font-weight: bold;
    color: #007bff;
}
.stat-label {
    color: #666;
    margin-top: 5px;
}
.status-indicator {
    display: inline-block;
    width: 12px;
    height: 12px;
    border-radius: 50%;
    margin-right: 8px;
}
.status-online {
    background-color: #28a745;
}
.status-offline {
    background-color: #dc3545;
}