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

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

.container {
    max-width: 600px;
    margin: 50px auto;
    padding: 30px;
    background-color: #fff;
    border-radius: 8px;
    box-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
}

h1 {
    text-align: center;
    margin-bottom: 30px;
    color: #4a6fa5;
}

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

.file-input {
    display: none;
}

.file-label {
    display: block;
    width: 100%;
    padding: 20px;
    border: 2px dashed #ccc;
    border-radius: 8px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.file-label:hover {
    border-color: #4a6fa5;
    background-color: #f9f9f9;
}

.upload-area.drag-over .file-label {
    border-color: #4a6fa5;
    background-color: #e6f0f8;
    border-style: solid;
}

.file-name {
    display: block;
    margin-bottom: 10px;
    font-size: 16px;
}

.file-icon {
    font-size: 32px;
}

.format-selector {
    margin-bottom: 30px;
}

.format-selector label {
    display: block;
    margin-bottom: 10px;
    font-weight: bold;
}

.format-select {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
}

.convert-btn {
    display: block;
    width: 100%;
    padding: 15px;
    background-color: #4a6fa5;
    color: #fff;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    font-weight: bold;
    cursor: pointer;
    transition: background-color 0.3s ease;
}

.convert-btn:hover {
    background-color: #3a5a85;
}

.convert-btn:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

.progress {
    margin-top: 30px;
    margin-bottom: 30px;
}

.progress-bar {
    width: 0%;
    height: 20px;
    background-color: #4a6fa5;
    border-radius: 10px;
    transition: width 0.3s ease;
    margin-bottom: 10px;
}

.progress-text {
    display: block;
    text-align: center;
    font-size: 14px;
    color: #666;
}

.result {
    text-align: center;
}

.download-link {
    display: inline-block;
    padding: 10px 20px;
    background-color: #4a6fa5;
    color: #fff;
    text-decoration: none;
    border-radius: 4px;
    margin-top: 20px;
    transition: background-color 0.3s ease;
}

.download-link:hover {
    background-color: #3a5a85;
}

.error-message {
    color: #e74c3c;
    margin-top: 20px;
    padding: 10px;
    background-color: #fce4e4;
    border-radius: 4px;
}

@media (max-width: 768px) {
    .container {
        margin: 20px;
        padding: 20px;
    }
    
    h1 {
        font-size: 24px;
    }
    
    .file-label {
        padding: 15px;
    }
    
    .convert-btn {
        padding: 12px;
    }
}