body {
    font-family: 'Helvetica Neue', sans-serif;
    background: #90d5ff;
    color: #333333;
    display: flex;
    justify-content: center;
    align-items: center;
    height: 100vh;
    margin: 0;
}

.container {
    width: 90%;
    max-width: 500px;
    background: #ffffff;
    padding: 35px;
    border-radius: 8px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.05);
    text-align: center;
}

textarea {
    width: 90%;
    padding: 12px;
    margin: 15px 0;
    resize: vertical;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    display: block;
    margin-left: auto;
    margin-right: auto;
}

button {
    background-color: #4a90e2;
    color: white;
    padding: 12px 20px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 16px;
    transition: background-color 0.2s ease;
}

button:hover {
    background-color: #357ABD;
}

.mode {
    margin-bottom: 15px;
}

.hidden {
    display: none;
}

footer {
    margin-top: 30px;
    font-size: 12px;
    color: #777;
}

footer a {
    color: #777;
    text-decoration: none;
    margin: 0 5px;
}

footer a:hover {
    text-decoration: underline;
}