body {
    font-family: Arial, sans-serif;
    background: #f4f4f4;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    min-height: 100vh;
    margin: 0;
}
.container {
    background: #fff;
    padding: 2rem;
    border-radius: 10px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    max-width: 400px;
    width: 100%;
}
textarea {
    width: 100%;
    height: 100px;
    margin-bottom: 1rem;
    padding: 0.5rem;
    font-size: 1rem;
    border-radius: 5px;
    border: 1px solid #ccc;
    resize: vertical;
}
.slider-container {
    display: flex;
    align-items: center;
    margin-bottom: 1rem;
}
.slider-container label {
    margin-right: 1rem;
}
.slider-container input[type=range] {
    flex: 1;
}
#display {
    font-size: 2rem;
    font-weight: bold;
    text-align: center;
    min-height: 2.5rem;
    margin-bottom: 1rem;
}
button {
    width: 100%;
    padding: 0.75rem;
    font-size: 1rem;
    background: #0078d7;
    color: #fff;
    border: none;
    border-radius: 5px;
    cursor: pointer;
    transition: background 0.2s;
}
button:disabled {
    background: #aaa;
    cursor: not-allowed;
}