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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f4f7f6;
    color: #333;
    line-height: 1.6;
    padding: 20px;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    background: #fff;
    padding: 30px;
    border-radius: 8px;
    box-shadow: 0 4px 6px rgba(0,0,0,0.1);
}

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

p {
    text-align: center;
    margin-bottom: 20px;
    color: #7f8c8d;
}

.form-group, .result-group {
    margin-bottom: 20px;
}

label {
    display: block;
    font-weight: bold;
    margin-bottom: 5px;
}

input[type="text"], textarea {
    width: 100%;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    margin-bottom: 10px;
    font-family: inherit;
}

button {
    background: #3498db;
    color: #fff;
    border: none;
    padding: 10px 20px;
    font-size: 16px;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.3s;
}

button:hover {
    background: #2980b9;
}

.preview {
    margin-top: 30px;
}

.preview h3 {
    margin-bottom: 10px;
    color: #2c3e50;
}

#preview-container {
    width: 100%;
    border: 1px solid #ddd;
    border-radius: 4px;
    overflow: hidden;
    background-color: #000;
}