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

body {
    font-family: Arial, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.container {
    background: white;
    border-radius: 10px;
    padding: 30px;
    max-width: 600px;
    width: 100%;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
}

h1 {
    text-align: center;
    color: #333;
    margin-bottom: 30px;
}

.upload-section {
    margin-bottom: 30px;
}

.drop-zone {
    border: 3px dashed #667eea;
    border-radius: 8px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
    background: #f8f9ff;
}

.drop-zone:hover {
    background: #e8ebff;
    border-color: #764ba2;
}

.drop-zone.drag-over {
    background: #d8dbff;
    border-color: #764ba2;
}

.drop-zone p {
    color: #666;
    font-size: 16px;
}

.drop-zone input[type="file"] {
    display: none;
}

.file-list {
    margin-top: 15px;
    max-height: 150px;
    overflow-y: auto;
}

.file-item {
    padding: 8px 12px;
    background: #f0f0f0;
    margin-bottom: 5px;
    border-radius: 4px;
    font-size: 14px;
    color: #333;
}

.process-section {
    margin-bottom: 30px;
}

.process-section label {
    display: block;
    margin-bottom: 10px;
    color: #333;
    font-weight: bold;
}

.process-section select {
    width: 100%;
    padding: 12px;
    border: 2px solid #ddd;
    border-radius: 6px;
    font-size: 16px;
    margin-bottom: 15px;
    cursor: pointer;
}

.process-section select:focus {
    outline: none;
    border-color: #667eea;
}

.process-section button {
    width: 100%;
    padding: 15px;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    color: white;
    border: none;
    border-radius: 6px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: transform 0.2s ease;
}

.process-section button:hover:not(:disabled) {
    transform: translateY(-2px);
}

.process-section button:disabled {
    background: #ccc;
    cursor: not-allowed;
}

.result-section {
    background: #f0f0f0;
    padding: 20px;
    border-radius: 6px;
    text-align: center;
}

.result-section h3 {
    color: #333;
    margin-bottom: 15px;
}

.result-section a {
    display: inline-block;
    padding: 12px 30px;
    background: #667eea;
    color: white;
    text-decoration: none;
    border-radius: 6px;
    font-weight: bold;
    transition: background 0.3s ease;
}

.result-section a:hover {
    background: #764ba2;
}