.tab-container {
    display: flex;
    justify-content: center;
    gap: 20px;
    margin-bottom: 30px;
}

.tab-button {
    padding: 12px 30px;
    font-size: 16px;
    border: none;
    border-radius: 6px;
    cursor: pointer;
    background: #fff;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    transition: all 0.3s ease;
}

.tab-button.active {
    background: #d32f2f;
    color: white;
}

.upload-button {
    padding: 12px 25px;
    background: #4CAF50;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s ease;
}

.upload-button:hover {
    background: #45a049;
}

.process-button {
    display: block;
    margin: 20px auto;
    padding: 12px 30px;
    background: #d32f2f;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s ease;
}

.process-button:hover {
    background: #b71c1c;
}

.download-button {
    display: block;
    margin: 20px auto;
    padding: 12px 30px;
    background: #2196F3;
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background 0.3s ease;
}

.download-button:hover {
    background: #1976D2;
}