/* ============================================================
   커스텀 셀렉트
   마크업 :
     <div class="cselect" data-cselect>
        <button type="button" class="cselect__display">
            <span class="cselect__label">선택해주세요</span>
            <img class="cselect__arrow" src="./img/icon_arr_ver.png" alt="">
        </button>
        <ul class="cselect__options">
            <li class="cselect__option" data-value="a">옵션 A</li>
            <li class="cselect__option" data-value="b">옵션 B</li>
        </ul>
        <input type="hidden" name="…" class="cselect__input" value="">
     </div>
   ============================================================ */

.cselect {
    position: relative;
    display: block;
    width: 100%;
}

.cselect__display {
    width: 100%;
    height: 4.4rem;
    padding: 0 2rem;
    display: flex;
    align-items: center;
    justify-content: space-between;
    box-sizing: border-box;
    border: 1px solid var(--line2);
    border-radius: 1rem;
    background: #fff;

    /* Body 1 토큰 */
    font-family:    var(--font-family-base);
    font-weight:    var(--font-body-1-weight);
    font-size:      var(--font-body-1-size);
    line-height:    var(--font-body-1-line);
    letter-spacing: var(--font-body-1-spacing);
    color: var(--gray-900);
    cursor: pointer;
    text-align: left;
    -webkit-appearance: none;
    appearance: none;
    z-index: 999;
}
.cselect__display:focus,
.cselect.is-open .cselect__display {
    outline: none;
    border-color: var(--color-primary);
}

.cselect__label {
    color: inherit;
    font: inherit;
    flex: 1 1 auto;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.cselect.is-placeholder .cselect__label {
    color: var(--gray-400);
}

.cselect__arrow {
    width: 2.4rem;
    height: 2.4rem;
    margin-left: 1rem;
    transition: transform .25s ease;
    flex-shrink: 0;
    margin-right: -.8rem;
}
.cselect.is-open .cselect__arrow {
    transform: rotate(180deg);
}

/* 옵션 패널 : 셀렉트와 1.6rem 갭, max-height 25.6rem, padding 2rem */
.cselect__options {
    position: absolute;
    left: 0;
    right: 0;
    top: calc(100% + 1rem);
    margin: 0;
    padding: 2rem;
    box-sizing: border-box;
    background: var(--gray-50);
    border-radius: 1rem;
    max-height: 20rem;
    overflow: auto;
    list-style: none;
    z-index: 10000;

    /* 슬라이드 다운 효과 */
    transform-origin: top;
    transform: scaleY(0.95) translateY(-0.4rem);
    opacity: 0;
    visibility: hidden;
    transition: opacity .2s ease, transform .2s ease, visibility .2s;
}
.cselect.is-open .cselect__options {
    transform: scaleY(1) translateY(0);
    opacity: 1;
    visibility: visible;
}
.cselect.is-open-up .cselect__options {
    top: auto;
    bottom: calc(100% + 1rem);
    transform-origin: bottom;
    transform: scaleY(0.95) translateY(0.4rem);
}
.cselect.is-open.is-open-up .cselect__options {
    transform: scaleY(1) translateY(0);
}

.cselect__options ul {
    height: 25dvh;
    max-height: 25.6rem;
    overflow-y: auto;
}

.cselect__option {
    padding: 1rem 0;

    /* Body 1 토큰 */
    font-family:    var(--font-family-base);
    font-weight:    var(--font-body-1-weight);
    font-size:      var(--font-body-1-size);
    line-height:    var(--font-body-1-line);
    letter-spacing: var(--font-body-1-spacing);
    color: #000;
    cursor: pointer;
}
.cselect__option.is-selected {
    color: var(--color-primary);
    font-weight: var(--fw-bold);
}

.cselect__option:first-child {
    padding-top: 0
}

.cselect__option:last-child {
    padding-bottom: 0
}