body {
    font-family: "Helvetica Neue", Arial, "Hiragino Kaku Gothic ProN", "Hiragino Sans", Meiryo, sans-serif;
    max-width: 800px;
    margin: 2rem auto;
    padding: 0 1rem;
    color: #333;
}

h1 {
    font-size: 1.5rem;
    margin-bottom: 0.5rem;
}

textarea {
    width: 100%;
    height: 100px;
    margin-bottom: 10px;
    padding: 10px;
    border: 1px solid #ccc;
    border-radius: 4px;
    font-size: 16px;
    box-sizing: border-box; /* パディングを含めた幅計算にする */
    resize: vertical; /* 縦方向のみリサイズ許可 */
}

.controls {
    margin-bottom: 20px;
}

button {
    padding: 10px 20px;
    cursor: pointer;
    background-color: #007bff;
    color: white;
    border: none;
    border-radius: 4px;
    font-size: 16px;
    transition: background-color 0.2s;
}

button:hover {
    background-color: #0056b3;
}

button:disabled {
    background-color: #ccc;
    cursor: not-allowed;
}

#result {
    padding: 15px;
    border: 1px solid #ddd;
    background: #f9f9f9;
    min-height: 50px;
    white-space: pre-wrap; /* 改行を維持 */
    border-radius: 4px;
    line-height: 1.6;
}

.info {
    font-size: 0.9em;
    color: #666;
    margin-bottom: 20px;
}

.loading {
    color: #e67e22;
    font-weight: bold;
    display: none; /* デフォルトは非表示 */
    margin-left: 10px;
}