* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
    min-height: 100vh;
    padding: 20px;
}
.container {
    max-width: 800px;
    margin: 0 auto;
    background: white;
    border-radius: 10px;
    padding: 30px;
    box-shadow: 0 10px 40px rgba(0,0,0,0.2);
}
h1 {
    color: #333;
    margin-bottom: 20px;
    text-align: center;
}
.info {
    background: #f0f4f8;
    padding: 15px;
    border-radius: 5px;
    margin-bottom: 20px;
}
.info p {
    margin: 10px 0;
    color: #555;
}
.test-section {
    margin: 30px 0;
    padding: 20px;
    border: 1px solid #e0e0e0;
    border-radius: 5px;
}
.test-section h2 {
    color: #667eea;
    margin-bottom: 15px;
}
.test-image {
    max-width: 100%;
    border-radius: 5px;
    margin: 10px 0;
}
button {
    background: #667eea;
    color: white;
    border: none;
    padding: 10px 20px;
    border-radius: 5px;
    cursor: pointer;
    font-size: 14px;
    transition: background 0.3s;
}
button:hover {
    background: #5568d3;
}
#dynamic-result {
    margin-top: 10px;
    color: #555;
}