/** Variables **/

:root {
    /* Background */
    --color-background: #eaf2ff;        /* 原 cbrd5e1 → 更冷的浅蓝灰 */
    --color-background-alt: #cfe2ff;    /* 原偏绿 → 同系浅蓝 */

    /* Border */
    --color-border-default: #b6c9ee;    /* 中性蓝灰边框 */
    --color-border-active: #0a5fd1;     /* 主色加深 */

    /* Primary */
    --color-primary: #0a7bff;           /* 主题主色 */
    --color-primary-active: #064fb3;    /* Active / Pressed 状态 */

    /* Highlight */
    --color-highlight: #6fb0ff;         /* 主色提亮、降低饱和 */

    /* Text */
    --color-text-default: #0b1f3a;      /* 深蓝黑，保证对比 */
    --color-text-muted: #4a6fa5;        /* 次级文本 */
    --color-requerd: #ff2929;
}


/** Base **/

*,
::before,
::after {
    box-sizing: border-box;
}

* {
    border: 0;
    margin: 0;
    padding: 0;
}

body {
    -webkit-font-smoothing: antialiased;
    font-optical-sizing: auto;
    font-style: normal;
}

button,
input,
optgroup,
select,
textarea {
    font-family: inherit;
    font-feature-settings: inherit;
    font-variation-settings: inherit;
    font-size: 100%;
    font-weight: inherit;
    line-height: inherit;
    color: inherit;
    margin: 0;
    padding: 0;
}

[type="checkbox"],
[type="radio"],
[type="range"] {
    appearance: none;
    flex-shrink: 0;
    padding: 0;
    user-select: none;
}

[type="checkbox"]:focus,
[type="radio"]:focus,
[type="range"]:focus {
    outline: none;
}

/** Components **/
.page18 .ct-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
}

.page18 .choice-box .item-l-box {
    width: 50%;
    position: relative;
    z-index: 10
}

.page18 .choice-box .item-r {
    width: 50%;
    position: relative;
    z-index: 10
}
.fs-form {
    display: grid;
    row-gap: 1em;
}

.fs-form:where(.fs-layout__2-column) {
    column-gap: 1em;
    grid-template-columns: 1fr 1fr;
}

fieldset {
    display: grid;
    margin: 1em 0;
    row-gap: 1em;
}

.fs-form:where(.fs-layout__2-column) fieldset {
    column-gap: 1em;
    grid-template-columns: 1fr 1fr;
    grid-column: 1 / -1;
}

.fs-fieldset-title {
    color: var(--color-text-default);
    font-size: 1.25em;
    font-weight: 500;
    line-height: 1.75em;
    margin-bottom: 1em;
    grid-column: 1 / -1;
}

.fs-field {
    display: flex;
    flex-direction: column;
    row-gap: 0.375em;
}

.fs-label {
    color: var(--color-text-default);
    display: block;
    font-size: 0.875em;
    font-weight: 500;
    line-height: 1.25em;
}
.fs-label i{
    color: var(--color-requerd);
}
.fs-description {
    color: var(--color-text-muted);
    display: block;
    font-size: 0.875em;
    line-height: 1.25em;
}

.fs-button-group {
    display: flex;
    flex-direction: row-reverse;
    column-gap: 0.75em;
}

.fs-form:where(.fs-layout__2-column) .fs-button-group {
    grid-column: 1 / -1;
}

.fs-button {
    background-color: var(--color-primary);
    border-radius: 0.375em;
    color: white;
    cursor: pointer;
    font-size: 0.875em;
    font-weight: 500;
    line-height: 1em;
    padding: 1em 2em;
    transition-duration: 200ms;
    transition-property: background-color;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
}

.fs-button:hover {
    background-color: var(--color-primary-active);
}

.fs-button:focus-visible {
    background-color: var(--color-primary-active);
    outline: 3px solid var(--color-highlight);
}

.fs-input,
.fs-select {
    appearance: none;
    border-radius: 0.375em;
    border-width: 0;
    box-shadow: var(--color-border-default) 0 0 0 1px inset;
    color: var(--color-text-default);
    font-size: 0.875em;
    height: 3em;
    line-height: 1.25em;
    outline: none;
    padding-left: 0.75em;
    padding-right: 0.75em;
}

.fs-input:focus-visible,
.fs-select:focus-visible {
    box-shadow: var(--color-border-active) 0 0 0 1.5px inset;
    outline: 3px solid var(--color-highlight);
    outline-offset: 0;
}

.fs-input::placeholder {
    color: var(--color-text-muted);
}

.fs-checkbox-group,
.fs-radio-group {
    display: flex;
    flex-direction: column;
    row-gap: 0.5em;
}

.fs-checkbox-field,
.fs-radio-field {
    column-gap: 0.5em;
    display: flex;
}

:is(.fs-checkbox-field, .fs-radio-field) .fs-label + .fs-description {
    margin-top: 0.125em;
}

.fs-checkbox-wrapper,
.fs-radio-wrapper {
    align-items: center;
    display: flex;
    height: 1.25em;
}

.fs-checkbox,
.fs-radio {
    background-color: #fff;
    border: 1px solid var(--color-text-default);
    height: 1em;
    width: 1em;
}

.fs-checkbox {
    border-radius: 0.25em;
}

.fs-radio {
    border-radius: 100%;
}

.fs-checkbox:checked,
.fs-radio:checked {
    background-color: var(--color-primary);
    background-position: center;
    background-repeat: no-repeat;
    background-size: 100% 100%;
    border-color: transparent;
}

.fs-checkbox:checked {
    background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3e%3cpath d='M12.207 4.793a1 1 0 010 1.414l-5 5a1 1 0 01-1.414 0l-2-2a1 1 0 011.414-1.414L6.5 9.086l4.293-4.293a1 1 0 011.414 0z'/%3e%3c/svg%3e");
}

.fs-radio:checked {
    background-image: url("data:image/svg+xml,%3csvg viewBox='0 0 16 16' fill='white' xmlns='http://www.w3.org/2000/svg'%3e%3ccircle cx='8' cy='8' r='3'/%3e%3c/svg%3e");
}

.fs-checkbox:focus-visible,
.fs-radio:focus-visible {
    outline: 3px solid var(--color-highlight);
    outline-offset: 0;
}

.fs-select {
    background-color: #fff;
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' fill='none' viewBox='0 0 20 20'%3e%3cpath stroke='%236b7280' stroke-linecap='round' stroke-linejoin='round' stroke-width='1.5' d='M6 8l4 4 4-4'/%3e%3c/svg%3e");
    background-position: right 0.5em center;
    background-repeat: no-repeat;
    background-size: 1.5em 1.5em;
    padding-right: 2.5em;
}

.fs-slider {
    background: transparent;
    cursor: pointer;
    height: 1.25em;
    width: 100%;
}

.fs-slider::-moz-range-track {
    background-color: var(--color-background);
    border-radius: 0.5em;
    height: 0.5em;
}

.fs-slider::-webkit-slider-runnable-track {
    background-color: var(--color-background);
    border-radius: 0.5em;
    height: 0.5em;
}

.fs-slider::-moz-range-thumb {
    background-color: var(--color-primary);
    border: none; /* Removes extra border that FF applies */
    border-radius: 50%;
    height: 1.25em;
    width: 1.25em;
}

.fs-slider::-webkit-slider-thumb {
    appearance: none;
    background-color: var(--color-primary);
    border-radius: 50%;
    height: 1.25em;
    margin-top: -0.375em; /* Centers thumb on the track */
    width: 1.25em;
}

.fs-slider:focus-visible::-moz-range-thumb {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.fs-slider:focus-visible::-webkit-slider-thumb {
    outline: 2px solid var(--color-primary);
    outline-offset: 2px;
}

.fs-switch {
    background-color: var(--color-background-alt);
    background-image: url("data:image/svg+xml,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='-4 -4 8 8'%3e%3ccircle r='3' fill='white'/%3e%3c/svg%3e");
    background-position: left center;
    background-repeat: no-repeat;
    border-radius: 1.5em;
    cursor: pointer;
    height: 1.5em;
    transition-duration: 200ms;
    transition-property: background-color, background-position;
    transition-timing-function: cubic-bezier(0.4, 0, 0.2, 1);
    width: 2.75em;
}

.fs-switch:checked {
    background-color: var(--color-primary);
    background-position: right center;
}

.fs-switch:focus-visible {
    outline: 3px solid var(--color-highlight);
    outline-offset: 0;
}

.fs-textarea {
    appearance: none;
    border-radius: 0.375em;
    border-width: 0;
    box-shadow: var(--color-border-default) 0 0 0 1px inset;
    color: var(--color-primary);
    font-size: 0.875em;
    line-height: 1.25em;
    outline: none;
    padding: 0.5em 0.75em;
    resize: vertical;
}

.fs-textarea:focus-visible {
    box-shadow: var(--color-border-active) 0 0 0 1.5px inset;
    outline: 3px solid var(--color-highlight);
    outline-offset: 0;
}

.fs-textarea::placeholder {
    color: var(--color-text-muted);
}

/** Utilities **/

.col-span-full {
    grid-column: 1 / -1;
}

.fs-textarea::placeholder {
    color: var(--color-text-muted);
}

.slider-label-container {
    display: flex;
    justify-content: space-between;
    width: 100%;
    margin-top: 0.25em;
}

.slider-label-text {
    font-size: 0.75em;
    color: var(--color-text-muted);
    text-align: center;
    white-space: nowrap;
}

#form-submit.is-loading {
    opacity: 0.6;
    cursor: not-allowed;
}
#form-submit.is-loading::after {
    content: ' ⏳';
}


@media screen and (max-width: 768px) {
    .page18 .item-r .chios-btm-a .list-b {
        flex-wrap: wrap
    }
    .page18 .item-r .chios-btm-a .list-b .txt-r {
        width: 100%
    }

    .page18 .item-r .chios-btm-a .list-b .txt-r p {
        font-size: .83em
    }

    .page18 .swithh-co-icon-c > div {
        padding: .5em
    }

    .page18 .choice-c.item-l .list-box .logo-list .txt-l {
        font-size: 1em;
        width: 4em
    }

    .page18 .choice-c.item-l .list-box .logo-list .pic-r {
        width: calc(100% - 4em)
    }

    .page18 .choice-c.item-l .list-box::after {
        left: 4em
    }

    .page18 .chios-btm-c .num-list .num-a {
        width: 100%
    }

    .page18 .chios-btm-c .num-list .num-a .num-l {
        font-size: 4em
    }

    .page18 .choice-box .item-l-box {
        margin-top: 1.5em;
        width: 100%;
        order: 3;
    }
}