body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    background-color: #f4f4f4;
    overflow: hidden;
}

.container {
    display: flex;
    width: 100%;
    height: 100vh;
    overflow: hidden;
}

.column {
    padding: 20px;
    box-sizing: border-box;
}

.column-a {
    width: 70%;
    background-color: #ffffff;
    border-right: 1px solid #ddd;
}

.column-b {
    width: 30%;
    background-color: #ffffff;
}

.list {
    background-color: #f5f5f5;
    border: 0px solid #ddd;
    /* 合并边框属性 */
    padding: 10px;
    border-radius: 10px;

    overflow: auto;
    font-size: 1em;
    /* 应用与.list-select相同的字体大小 */
    color: #333;
    /* 应用与.list-select相同的字体颜色 */
    text-align: left;
    /* 假设默认文本左对齐，如有需要可调整 */
    transition: background-color 0.3s ease;
    /* 应用平滑过渡效果 */
}

.list p {
    margin: 0;
}

.name-list {
    height: 300px;
    margin-bottom: 20px;
}

.select-output {
    height: 200px;
    font-size: 70px;
    margin: 20px;
    margin-top: 45px;
    padding: 20px;
    overflow: hidden;
}

.select-output h1 {
    text-align: center;
    margin: 0 auto 25px;
    color: #333;
}

.select-output p {
    text-align: center;
    margin: 0 auto 25px;
    color: #333;
}

.column-b h1 {
    text-align: center;
    margin: 0 auto 25px;
    color: #333;
}

.list-select {
    appearance: none;
    -moz-appearance: none;
    -webkit-appearance: none;
    padding: 10px 15px;
    font-size: 1em;
    border: none;
    border-radius: 5px;
    background-color: #f5f5f5;
    color: #333;
    width: 100%;
    transition: background-color 0.3s ease;
}

.list-select:hover {
    background-color: #eaeaea;
}

.list-select:focus {
    outline: none;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

.list-select[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
}

.list-select option {
    padding: 10px;
    font-size: 1em;
    background-color: #f5f5f5;
    color: #333;
}

.list-select option:checked {
    background-color: #dcdcdc;
}

.list-select option[value=''] {
    color: #aaa;
}

.btn {
    margin-top: 20px;
    margin-bottom: 20px;
    margin-right: 30px;
    appearance: none;
    -moz-appearance: none;
    -webkit-appearance: none;
    padding: 10px 15px;
    font-size: 20px;
    font-weight: bold;
    border: none;
    border-radius: 5px;
    background-color: #f5f5f5;
    color: #333;
    cursor: pointer;
    width: auto;
    transition: background-color 0.3s ease, transform 0.2s ease;
}

.btn:hover {
    background-color: #eaeaea;
    transform: translateY(-2px);
}

.btn:focus {
    outline: none;
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

.btn[disabled] {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.btn:active {
    background-color: #dcdcdc;
    transform: translateY(1px);
}

.checkbox-style {
    appearance: none;
    -moz-appearance: none;
    -webkit-appearance: none;
    margin: 0;
    padding: 0;
    border: none;
    outline: none;
    vertical-align: middle;
    cursor: pointer;
    transition: background-color 0.3s ease;
    position: relative;
}

.checkbox-style::before {
    content: '';
    display: inline-block;
    width: 15px;
    height: 15px;
    margin-right: 10px;
    border: 1px solid #ccc;
    background-color: #fff;
    vertical-align: middle;
    transition: background-color 0.3s ease, border-color 0.3s ease;
}

.checkbox-style:checked::before {
    background-color: #4CAF50;
    border-color: #4CAF50;
}

.checkbox-style:checked::after {
    content: '\2713';
    position: absolute;
    top: 3px;
    left: 3px;
    font-size: 12px;
    line-height: 1;
    color: #fff;
    text-align: center;
}

.checkbox-style:hover::before {
    border-color: #bbb;
}

.checkbox-style:focus::before {
    box-shadow: 0 0 5px rgba(0, 0, 0, 0.1);
}

.checkbox-style:disabled::before {
    opacity: 0.5;
    cursor: not-allowed;
}

.checkbox-label {
    font-size: 1em;
    color: #333;
    cursor: pointer;
    user-select: none;
}

.checkbox-style:disabled+.checkbox-label {
    opacity: 0.5;
    cursor: not-allowed;
}