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

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background-color: #f0f4f8;
    color: #333;
    line-height: 1.6;
}

.container {
    max-width: 800px;
    margin: 0 auto;
    padding: 2rem;
}

h1#main-heading {
    text-align: center;
    font-size: 2.5rem;
    margin-bottom: 1rem;
    color: #2c5f7c;
}

p#description {
    text-align: center;
    font-size: 1.1rem;
    margin-bottom: 2rem;
    color: #555;
}

.interactive-section {
    background: #fff;
    border-radius: 12px;
    padding: 2rem;
    text-align: center;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
}

.interactive-section h2 {
    margin-bottom: 1rem;
    color: #2c5f7c;
}

#color-button {
    display: inline-block;
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    color: #fff;
    background-color: #2c5f7c;
    border: none;
    border-radius: 8px;
    cursor: pointer;
    transition: background-color 0.3s ease, transform 0.1s ease;
}

#color-button:hover {
    background-color: #1e4a5f;
}

#color-button:active {
    transform: scale(0.97);
}

.response {
    margin-top: 1.5rem;
    padding: 1rem;
    border-radius: 8px;
    font-weight: bold;
    transition: all 0.3s ease;
}

.response.hidden {
    display: none;
}