.container { max-width: 1200px; margin: 0 auto; padding: 20px; }
.io-container {
    display: flex;
    gap: 20px;
    margin-bottom: 20px;
}
.input-section, .output-section {
    flex: 1;
    display: flex;
    flex-direction: column;
}
.text-area {
    width: 100%;
    height: 400px;
    padding: 15px;
    border: 1px solid #ccc;
    border-radius: 5px;
    font-family: monospace;
    resize: vertical;
}
.output-section .text-area { background-color: #f9f9f9; } /* 输出框只读背景 */
.button-section {
    text-align: center;
}
.btn {
    padding: 10px 20px;
    margin: 0 10px;
    border: none;
    border-radius: 4px;
    background: #007cba;
    color: white;
    cursor: pointer;
}

.cp_btn {
    width: 200px;
}

.btn:hover { background: #005a87; }

.show {
    width: 110px;
    margin-left: 5px;
    margin-bottom: 5px;
    background-color: #047BFB;
    font-size: 22px;
    text-align: center;
    border-radius: 24px;
    user-select: none;
}