body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    max-width: 1200px;
    margin: 0 auto;
    padding: 20px;
    background: #f5f5f5;
}
.container {
    background: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
}
h1 {
    color: #333;
    text-align: center;
    margin-bottom: 30px;
}
.input-section, .output-section {
    margin-bottom: 25px;
}
label {
    display: block;
    margin-bottom: 8px;
    font-weight: bold;
    color: #555;
}
textarea {
    width: 100%;
    height: 200px;
    padding: 15px;
    border: 2px solid #ddd;
    border-radius: 8px;
    font-family: 'Courier New', monospace;
    font-size: 14px;
    resize: vertical;
    box-sizing: border-box;
}
textarea:focus {
    border-color: #4CAF50;
    outline: none;
}
.button-group {
    text-align: center;
    margin: 25px 0;
}
button {
    background: #4CAF50;
    color: white;
    border: none;
    padding: 12px 30px;
    font-size: 16px;
    border-radius: 6px;
    cursor: pointer;
    margin: 0 10px;
    transition: background 0.3s;
}
button:hover {
    background: #45a049;
}
button:disabled {
    background: #cccccc;
    cursor: not-allowed;
}
.info-box {
    background: #e7f3ff;
    border-left: 4px solid #2196F3;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
}
.success-box {
    background: #e8f5e8;
    border-left: 4px solid #4CAF50;
    padding: 15px;
    margin: 20px 0;
    border-radius: 4px;
}
.mapping-table {
    background: #f9f9f9;
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
}
.mapping-table table {
    width: 100%;
    border-collapse: collapse;
}
.mapping-table th, .mapping-table td {
    padding: 8px 12px;
    text-align: left;
    border-bottom: 1px solid #ddd;
}
.mapping-table th {
    background: #f0f0f0;
    font-weight: bold;
}
.example {
    background: #fff9e6;
    border: 1px solid #ffd700;
    padding: 15px;
    border-radius: 8px;
    margin: 15px 0;
}