/* 단독 중앙 콘텐츠는 화면 폭에 따라 연속적으로 줄어들도록 최대 폭만 제한한다. */
.responsive-shell {
    width: 100%;
    margin-inline: auto;
}

.responsive-shell--compact {
    max-width: 536px;
}

.responsive-shell--form {
    max-width: 696px;
}

.responsive-shell--reading {
    max-width: 960px;
}

/* 중앙 카드 안쪽 여백도 브레이크포인트에서 갑자기 바뀌지 않도록 연속적으로 조절한다. */
.responsive-panel {
    padding: clamp(24px, 8%, 48px);
}

.responsive-panel--dense {
    padding: clamp(16px, 4%, 24px);
}

/* 인증 화면은 모바일 기준 폭과 좌우 여백을 유지하고 바깥 카드 없이 표시한다. */
.account-auth-shell {
    width: calc(100% - 48px);
    max-width: 480px;
    margin-inline: auto;
}

/* iOS의 기본 select 최소 폭과 관계없이 생년월일을 한 줄로 유지한다. */
.birth-date-grid {
    display: grid;
    grid-template-columns: minmax(0, 5fr) repeat(2, minmax(0, 3.5fr));
    gap: 0.5rem;
}

.birth-date-part,
.birth-date-part .input-group,
.birth-date-part .form-select {
    min-width: 0;
}

/* 독자 본문 화면의 좌우 회차 버튼은 본문 방향으로 회차 정보를 펼친다. */
.episode-side-nav-wrap {
    z-index: 2;
}

.episode-side-nav {
    position: relative;
    width: 48px;
    height: 48px;
    padding: 0;
    overflow: visible;
    z-index: 1;
}

.episode-side-nav > .bi {
    z-index: 2;
}

.episode-side-nav__details {
    position: absolute;
    top: 50%;
    display: block;
    width: min(288px, 35vw);
    padding: 10px 14px;
    border: 1px solid var(--bs-secondary);
    border-radius: var(--bs-border-radius-lg);
    background-color: var(--bs-secondary);
    color: var(--bs-white);
    text-align: left;
    white-space: normal;
    overflow-wrap: anywhere;
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: opacity 0.15s ease, transform 0.15s ease, visibility 0.15s ease;
    z-index: 1;
}

.episode-side-nav--previous .episode-side-nav__details {
    left: calc(100% - 12px);
    padding-left: 20px;
    transform: translate(-8px, -50%);
}

.episode-side-nav--next .episode-side-nav__details {
    right: calc(100% - 12px);
    padding-right: 20px;
    transform: translate(8px, -50%);
}

.episode-side-nav:hover .episode-side-nav__details,
.episode-side-nav:focus-visible .episode-side-nav__details {
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transform: translate(0, -50%);
}

.episode-side-nav__direction,
.episode-side-nav__title {
    display: block;
}

.episode-side-nav__direction {
    font-size: 0.75rem;
    font-weight: 700;
}

.episode-side-nav__title {
    margin-top: 2px;
    font-size: 0.875rem;
    font-weight: 600;
    line-height: 1.4;
}

/* 터치 화면에서는 회차 정보를 하단 이동 버튼에 항상 표시한다. */
.episode-mobile-nav__button {
    display: flex;
    flex: 1 1 0;
    flex-direction: column;
    justify-content: center;
    min-width: 0;
    padding: 10px 12px;
    white-space: normal;
}

.episode-mobile-nav__button--previous {
    align-items: flex-start;
    text-align: left;
}

.episode-mobile-nav__button--next {
    align-items: flex-end;
    text-align: right;
}

.episode-mobile-nav__direction,
.episode-mobile-nav__title {
    display: block;
}

.episode-mobile-nav__direction {
    font-weight: 700;
}

.episode-mobile-nav__title {
    margin-top: 4px;
    font-size: 0.875rem;
    line-height: 1.4;
    overflow-wrap: anywhere;
}

@media (prefers-reduced-motion: reduce) {
    .episode-side-nav__details {
        transition: none;
    }
}

/* 에피소드 본문 보기 설정은 독자 화면과 작가 미리보기 화면에서 공유한다. */
.episode-reading-settings__popover {
    width: 300px;
    max-width: calc(100vw - 24px);
    margin-top: 10px !important;
    padding: 14px;
    border-color: var(--bs-border-color);
    border-radius: var(--bs-border-radius-lg);
    box-shadow: var(--bs-box-shadow);
    z-index: 1030;
}

.episode-reading-settings__popover::before {
    position: absolute;
    top: -7px;
    right: 13px;
    width: 12px;
    height: 12px;
    border-top: 1px solid var(--bs-border-color);
    border-left: 1px solid var(--bs-border-color);
    background-color: var(--bs-white);
    content: "";
    transform: rotate(45deg);
}

.episode-reading-font-control {
    min-height: 52px;
    overflow: hidden;
}

.episode-reading-font-preview {
    width: 64px;
    min-height: 52px;
    background-color: var(--bs-white);
    color: var(--bs-body-color);
    line-height: 1;
}

.episode-reading-theme[aria-pressed="true"] {
    border-color: var(--bs-primary) !important;
    box-shadow: 0 0 0 2px rgba(var(--bs-primary-rgb), 0.2);
}

.episode-reading-theme {
    flex: 1 1 0;
    justify-content: center;
    min-width: 0;
    padding-inline: 8px;
}

.episode-reading-theme__swatch {
    display: inline-block;
    flex-shrink: 0;
    width: 22px;
    height: 22px;
    border: 1px solid rgba(0, 0, 0, 0.25);
    border-radius: 50%;
}

.episode-reading-theme__swatch--white {
    background-color: #ffffff;
}

.episode-reading-theme__swatch--beige {
    background-color: #eee3cf;
}

.episode-reading-theme__swatch--dark {
    background-color: #202124;
}

.episode-reading-content {
    --episode-reading-font-size: 16px;
    padding: clamp(16px, 4vw, 32px);
    border-radius: var(--bs-border-radius-lg);
    font-size: var(--episode-reading-font-size);
    overflow-wrap: anywhere;
    transition: background-color 0.15s ease, color 0.15s ease;
}

.episode-reading-content[data-reader-theme="white"] {
    background-color: #ffffff;
    color: #212529;
}

.episode-reading-content[data-reader-theme="beige"] {
    background-color: #eee3cf;
    color: #171717;
}

.episode-reading-content[data-reader-theme="dark"] {
    background-color: #202124;
    color: #f8f9fa;
}

@media (prefers-reduced-motion: reduce) {
    .episode-reading-content {
        transition: none;
    }
}