#header {
    display: flex;
    flex-direction: column;
    /* 垂直排列 */
    justify-content: space-between;
    /* 均匀分布 */
    align-items: center;
    /* 垂直居中对齐 */
    height: auto;
    /* 自适应高度 */
    max-height: 300px;
    /* 限制最大高度 */
    padding: 20px 0;
    /* 给顶部和底部添加间距 */
}


#site-title {
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 24px;
    /* 增大字体 */
    color: white;
    margin-bottom: 30px;
    /* 增大标题与输入框的间距 */
    font-weight: bold;
    /* 设置加粗字体 */
}

#site-title .logo {
    width: 20px;
    /* 调整图标大小 */
    height: 20px;
    margin-right: 15px;
    /* 图标与标题之间的间距 */
    margin-left: 15px;
    /* 图标与标题之间的间距 */
}

.c-checkbox {
    visibility: hidden;
}

.c-checkbox:not(:checked)+.c-formContainer {
    .c-form__input:required:valid~.c-form__toggle {
        pointer-events: auto;
        cursor: pointer;
    }
}

.c-checkbox:checked+.c-formContainer {
    .c-form {
        width: 18.75em;
    }

    .c-form__toggle {
        visibility: hidden;
        opacity: 0;
        transform: scale(0.7);
    }

    .c-form__input,
    .c-form__buttonLabel {
        transition: 0.2s 0.1s;
        visibility: visible;
        opacity: 1;
        transform: scale(1);
    }
}

.c-checkbox:checked+.c-formContainer~#presetContainer {
    opacity: 1;
    visibility: visible;
    transition: opacity 0.3s ease, visibility 0s 0s;
}

.c-checkbox:not(:checked)+.c-formContainer~#presetContainer {
    opacity: 0;
    visibility: hidden;
    transition: opacity 0.3s ease, visibility 0s 0.3s;
}

.c-formContainer {
    position: absolute;
    margin-top: 35px;
    display: flex;
    left: 50%;
    transform: translate(-50%, -50%);
    font-weight: 700;
}

.c-form,
.c-form__toggle {
    width: 10em;
    height: 1.8em;
    position: absolute;
    border-radius: 3.125em;
    background-color: #ffffff;
    transition: 0.2s;
}

.c-form {
    left: 50%;
    transform: translateX(-50%);
    padding: 0.3125em;
    box-sizing: border-box;
    box-shadow: 0 0.0625em 0.15625em rgba(#000000, 0.3);
    display: flex;
    justify-content: center;
}

.c-form__toggle {
    color: #ff7b73;
    top: 0;
    cursor: pointer;
    z-index: 1;
    display: flex;
    align-items: center;
    justify-content: center;
}

.c-form__toggle::before {
    font-size: 0.8em;
    content: attr(data-title);
}

.c-form__input,
.c-form__button {
    font: inherit;
    border: 0;
    outline: 0;
    border-radius: 2.5em;
    box-sizing: border-box;
}

.c-form__input,
.c-form__buttonLabel {
    font-size: 0.8em;
    opacity: 0;
    visibility: hidden;
    transform: scale(0.7);
    transition: 0s;
}

.c-form__input {
    color: #ffcccc;
    height: 100%;
    width: 100%;
    padding: 0 0.357em;
}

.c-form__input::placeholder {
    color: currentColor;
}

.c-form__input:required:valid {
    color: #ff7b73;

    +.c-form__buttonLabel {
        color: #ffffff;

        &::before {
            pointer-events: initial;
        }
    }
}

.c-form__buttonLabel {
    color: #ffaea9;
    height: 100%;
    width: auto;

    &::before {
        content: '';
        position: absolute;
        width: 100%;
        height: 100%;
        pointer-events: none;
        cursor: pointer;
    }
}

.c-form__button {
    color: inherit;
    padding: 0;
    height: 100%;
    width: 2.5em;
    background-color: #ff7b73;
}