* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 40px 20px;
}

h1 {
    text-align: center;
    margin-bottom: 10px;
    color: #2c3e50;
}

p {
    text-align: center;
    margin-bottom: 30px;
    color: #7f8c8d;
}

.upload-container {
    background-color: #fff;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
}

.upload-box {
    border: 2px dashed #3498db;
    border-radius: 8px;
    padding: 40px 20px;
    text-align: center;
    cursor: pointer;
    transition: all 0.3s ease;
}

.upload-box:hover {
    background-color: #f0f9ff;
    border-color: #2980b9;
}

.upload-icon {
    width: 50px;
    height: 50px;
    margin-bottom: 15px;
    color: #3498db;
}

.file-label {
    display: block;
    cursor: pointer;
}

.hidden {
    display: none;
}

#file-info {
    margin-top: 20px;
    padding: 15px;
    background-color: #f0f9ff;
    border-radius: 8px;
    border: 1px solid #d6eaf8;
}

.convert-btn {
    display: block;
    margin: 20px auto 0;
    padding: 12px 25px;
    background-color: #3498db;
    color: white;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.3s ease;
}

.convert-btn:hover {
    background-color: #2980b9;
}

.progress-bar {
    height: 20px;
    background-color: #ecf0f1;
    border-radius: 10px;
    margin: 20px 0;
    overflow: hidden;
}

#progress-bar-fill {
    height: 100%;
    background-color: #2ecc71;
    width: 0;
    transition: width 0.3s ease;
}

#progress-container {
    margin-top: 20px;
}

#status-message {
    text-align: center;
    color: #7f8c8d;
}

/* Drag and drop highlighting */
.highlight {
    background-color: #f0f9ff;
    border-color: #3498db;
}