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

body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

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

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

.card-header {
    padding: 1.5rem;
    border-bottom: 1px solid #eee;
}

.card-header h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
    color: #2d3748;
}

.card-header p {
    color: #718096;
    font-size: 0.875rem;
}

.card-content {
    padding: 1.5rem;
}

.upload-area {
    margin-bottom: 1.5rem;
}

.file-upload {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    height: 8rem;
    border: 2px dashed #cbd5e0;
    border-radius: 8px;
    background-color: #f7fafc;
    cursor: pointer;
    transition: background-color 0.2s;
}

.file-upload:hover {
    background-color: #edf2f7;
}

.upload-icon {
    color: #718096;
    margin-bottom: 0.5rem;
}

.file-upload span {
    color: #718096;
    font-size: 0.875rem;
}

.loading {
    text-align: center;
    padding: 1rem;
    color: #718096;
}

.download-button-container {
    display: flex;
    justify-content: flex-end;
    margin-bottom: 1rem;
}

.download-button {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    background-color: #4299e1;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    transition: background-color 0.2s;
}

.download-button:hover {
    background-color: #3182ce;
}

.table-container {
    overflow-x: auto;
}

table {
    width: 100%;
    border-collapse: collapse;
    white-space: nowrap;
}

th, td {
    padding: 0.75rem 1rem;
    text-align: left;
    border: 1px solid #e2e8f0;
}

th {
    background-color: #f7fafc;
    font-weight: 600;
    color: #2d3748;
}

tr:hover {
    background-color: #f7fafc;
}

@media (max-width: 768px) {
    .container {
        margin: 1rem auto;
    }
    
    .card-header {
        padding: 1rem;
    }
    
    .card-content {
        padding: 1rem;
    }
}