/* layout: 인증 화면과 공통 메뉴에서 재사용하는 언어 선택 토글 */
.language-selector {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    gap: 0.32rem;
    max-width: 100%;
}
.language-selector__label {
    color: rgba(107, 118, 132, 0.72);
    font-size: 0.58rem;
    font-weight: 720;
    line-height: 1;
    letter-spacing: 0.13em;
    text-transform: uppercase;
}
.language-toggle {
    display: inline-grid;
    grid-template-columns: repeat(2, max-content);
    align-items: center;
    gap: 0.12rem;
    max-width: 100%;
    min-height: 2rem;
    padding: 0.16rem;
    border: 1px solid rgba(15, 23, 42, 0.09);
    border-radius: 999px;
    color: rgba(107, 118, 132, 1);
    background-color: rgba(242, 244, 246, 0.78);
    box-shadow: inset 0 1px 2px rgba(15, 23, 42, 0.035);
    font-family: inherit;
    cursor: default;
    opacity: 1;
}
.language-toggle:not(:disabled) {
    cursor: pointer;
}
.language-toggle:disabled {
    color: rgba(107, 118, 132, 1);
    opacity: 1;
}
.language-toggle__option {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.3rem;
    min-height: 1.58rem;
    padding: 0 0.48rem;
    border-radius: 999px;
    font-size: 0.68rem;
    font-weight: 650;
    line-height: 1;
    white-space: nowrap;
    transition: color 0.18s ease, background-color 0.18s ease,
        box-shadow 0.18s ease;
}
.language-toggle__option.is-active {
    color: rgba(51, 61, 75, 1);
    background-color: rgba(255, 255, 255, 0.98);
    box-shadow: 0 2px 7px rgba(15, 23, 42, 0.08);
}
.language-toggle:not(:disabled):hover .language-toggle__option:not(.is-active) {
    color: rgba(49, 130, 246, 1);
}
.language-toggle__mark {
    display: block;
    flex: 0 0 auto;
    width: 1.18rem;
    height: 0.885rem;
    border: 1px solid rgba(15, 23, 42, 0.1);
    border-radius: 0.16rem;
    background-color: rgba(255, 255, 255, 1);
    object-fit: cover;
    box-shadow: 0 1px 2px rgba(15, 23, 42, 0.08);
}

/* 접근성: 언어 선택 토글의 키보드 포커스 표시 */
.language-toggle:not(:disabled):focus-visible {
    outline: 3px solid rgba(49, 130, 246, 0.28);
    outline-offset: 3px;
}

/* layout: 공통 헤더 브랜드 링크 */
.intro-header__title-link,
.intro-header__title-link:visited,
.intro-header__title-link:active {
    color: rgba(51, 65, 85, 1);
    text-decoration: none;
}
.intro-header__title-link {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    transition: color 0.2s ease;
}
.intro-header__title-link:hover,
.intro-header__title-link:focus {
    color: rgba(3, 105, 161, 1);
    text-decoration: none;
}

/* 접근성: 공통 헤더 링크의 키보드 포커스 표시 */
.intro-header__title-link:focus-visible {
    outline: 3px solid rgba(3, 105, 161, 0.35);
    outline-offset: 3px;
}
.intro-header__title {
    margin-bottom: 0;
}

/* layout: 공통 내비게이션 내부 정렬 */
.site-nav > .site-nav__inner {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 0.75rem;
    flex-wrap: nowrap;
    width: 100%;
    max-width: 100%;
    margin: 0 auto;
}
.site-nav__menu {
    display: flex;
    align-items: center;
    min-width: 0;
    gap: 0.15rem;
}

/* layout: 공통 내비게이션 메뉴 드롭다운 */
.site-nav-dropdown {
    position: relative;
    margin: 0;
}
.site-nav-dropdown > summary {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.45rem;
    min-width: 2.5rem;
    padding: 0 0.8rem;
    cursor: pointer;
    list-style: none;
    user-select: none;
    transition: color 0.18s ease, background-color 0.18s ease, transform 0.18s ease;
}
.site-nav-dropdown > summary::-webkit-details-marker {
    display: none;
}
.site-nav-dropdown > summary:hover,
.site-nav-dropdown > summary:focus {
    outline: none;
}
.site-nav-dropdown__icon {
    display: inline-block;
    width: auto;
    height: auto;
    border: 0;
    transform: none;
}
.site-nav-dropdown__menu {
    position: absolute;
    top: calc(100% + 0.45rem);
    left: 0;
    min-width: 13rem;
    z-index: 1040;
}
.site-nav-dropdown__item {
    padding: 0.6rem 0.75rem;
    font-size: 0.92rem;
    line-height: 1.35;
    text-decoration: none;
}
.site-nav-dropdown__item:hover,
.site-nav-dropdown__item:focus {
    text-decoration: none;
    outline: none;
}

/* layout: 공통 내비게이션 글쓰기·로그아웃 액션 */
.site-nav__actions {
    display: flex;
    align-items: center;
    flex-wrap: nowrap;
    gap: 0.5rem;
    flex-shrink: 0;
}
.site-nav__actions .btn {
    margin: 0;
    white-space: nowrap;
}

/* 반응형layout: 데스크탑 화면별 내비게이션 콘텐츠 폭 */
@media (min-width: 992px) {
    .site-nav > .site-nav__inner {
        max-width: 800px;
    }
}
@media (min-width: 1200px) {
    .site-nav > .site-nav__inner {
        max-width: 855px;
    }
}

/* layout: 스크롤 고정 상태 */
.site-nav {
    position: sticky;
    top: 0;
    z-index: 1030; /* layout: 내비게이션을 화면 앞에 배치 */
    transition: background-color 0.22s ease, box-shadow 0.22s ease;
}
.site-nav.is-stuck {
    backdrop-filter: blur(10px);
    -webkit-backdrop-filter: blur(10px);
}

/* layout: 공통 푸터 GitHub 아이콘 */
.site-footer__icon {
    margin-right: 0.35rem;
}

/* tokens: Tailwind와 함께 사용하는 프로젝트 공통 디자인 토큰 */
:root {
    --project-canvas: rgba(247, 249, 252, 1);
    --project-surface-soft: rgba(242, 244, 246, 1);
    --project-ink: rgba(25, 31, 40, 1);
    --project-body: rgba(51, 61, 75, 1);
    --project-muted: rgba(107, 118, 132, 1);
    --project-line: rgba(15, 23, 42, 0.08);
    --project-brand: rgba(49, 130, 246, 1);
    --project-brand-strong: rgba(27, 100, 218, 1);
}

/* base: 문서 스크롤과 프로젝트 공통 배경·타이포그래피 */
html {
    scroll-behavior: smooth;
}
body.project-shell {
    background:
        radial-gradient(circle at 12% 8%, rgba(219, 234, 254, 0.72), transparent 25rem),
        radial-gradient(circle at 88% 18%, rgba(224, 231, 255, 0.58), transparent 24rem),
        var(--project-canvas);
    -webkit-font-smoothing: antialiased;
    text-rendering: optimizeLegibility;
}
::selection {
    color: rgba(25, 31, 40, 1);
    background-color: rgba(191, 219, 254, 1);
}

/* 접근성: 키보드 사용자를 위한 본문 바로가기 */
.skip-link {
    position: absolute;
    top: 0.75rem;
    left: 50%;
    z-index: 1100;
    padding: 0.65rem 1rem;
    border-radius: 999px;
    color: rgba(255, 255, 255, 1);
    background-color: var(--project-brand-strong);
    transform: translate(-50%, -180%);
    transition: transform 0.18s ease;
}
.skip-link:focus {
    color: rgba(255, 255, 255, 1);
    text-decoration: none;
    transform: translate(-50%, 0);
}

/* layout: 공통 헤더 배경과 브랜드 문구 */
.site-header {
    position: relative;
    isolation: isolate;
    overflow: hidden;
    border-color: var(--project-line) !important;
    background:
        radial-gradient(circle at 28% -30%, rgba(255, 255, 255, 0.95), transparent 20rem),
        linear-gradient(135deg,
            rgba(240, 247, 255, 1),
            rgba(228, 239, 255, 1),
            rgba(242, 245, 255, 1)
        );
    animation: none;
}
.site-header > .container {
    position: relative;
    z-index: 1;
}
.site-header::after {
    position: absolute;
    right: -5rem;
    bottom: -8rem;
    width: 18rem;
    height: 18rem;
    z-index: 0;
    border-radius: 999px;
    background-color: rgba(255, 255, 255, 0.56);
    filter: blur(2px);
    content: "";
    pointer-events: none;
}
.intro-header__eyebrow {
    margin-bottom: 0.55rem;
    color: var(--project-brand-strong);
    font-size: 0.7rem;
    font-weight: 700;
    letter-spacing: 0.16em;
}
.intro-header__title {
    color: var(--project-ink);
    font-size: clamp(1.75rem, 4vw, 2.35rem);
    font-weight: 750;
    letter-spacing: -0.045em;
}
.intro-header__title-link:hover,
.intro-header__title-link:focus {
    color: var(--project-brand-strong);
}
.intro-header__subtitle {
    max-width: 30rem;
    margin: 0.65rem auto 0;
    color: var(--project-muted);
    font-size: 0.92rem;
    line-height: 1.65;
}

/* layout: 공통 내비게이션 색상과 드롭다운 표현 */
.site-nav {
    border-bottom: 1px solid var(--project-line);
    background-color: rgba(255, 255, 255, 0.86) !important;
    box-shadow: none;
    backdrop-filter: blur(18px);
    -webkit-backdrop-filter: blur(18px);
}

/* interaction: 스크롤 고정 내비게이션 상태 */
.site-nav.is-stuck {
    background-color: rgba(255, 255, 255, 0.92) !important;
    box-shadow: 0 12px 36px rgba(15, 23, 42, 0.08);
}
.site-nav-dropdown > summary {
    min-height: 2.75rem;
    border: 1px solid transparent;
    border-radius: 999px;
    color: var(--project-body);
    background-color: transparent;
}

/* interaction: 내비게이션 드롭다운의 hover·focus·open 상태 */
.site-nav-dropdown > summary:hover,
.site-nav-dropdown > summary:focus,
.site-nav-dropdown[open] > summary {
    border-color: var(--project-line);
    color: var(--project-ink);
    background-color: var(--project-surface-soft);
    transform: none;
}

/* 접근성: 내비게이션과 푸터 링크의 키보드 포커스 표시 */
.site-nav-dropdown > summary:focus-visible,
.site-nav__actions a:focus-visible,
.site-footer a:focus-visible {
    outline: 3px solid rgba(49, 130, 246, 0.3);
    outline-offset: 3px;
}

/* animation: 드롭다운 화살표의 open 회전 효과 */
.site-nav-dropdown__icon {
    font-size: 0.8rem;
    line-height: 1;
    transition: transform 0.18s ease;
}
.site-nav-dropdown[open] .site-nav-dropdown__icon {
    transform: rotate(180deg);
}
.site-nav-dropdown__menu {
    overflow: hidden;
    padding: 0.45rem;
    border: 1px solid var(--project-line);
    border-radius: 1rem;
    background-color: rgba(255, 255, 255, 0.96);
    box-shadow: 0 18px 50px rgba(15, 23, 42, 0.14);
}
.site-nav-dropdown__item {
    display: flex;
    align-items: center;
    gap: 0.6rem;
    min-height: 2.75rem;
    border-radius: 0.75rem;
    color: var(--project-body);
    background-color: transparent;
}

/* interaction: 드롭다운 메뉴 항목의 hover·focus 상태 */
.site-nav-dropdown__item:hover,
.site-nav-dropdown__item:focus {
    color: var(--project-ink);
    background-color: var(--project-surface-soft);
}

/* layout: 링크와 버튼으로 구성된 내비게이션 항목의 동일한 너비와 정렬 */
.site-nav-dropdown__item--button {
    width: 100%;
    border: 0;
    text-align: left;
    font-family: inherit;
    cursor: pointer;
}

/* layout: 내비게이션 드롭다운 하단의 언어 선택 영역 */
.site-nav-language {
    display: flex;
    justify-content: center;
    margin-top: 0.35rem;
    padding: 0.72rem 0.35rem 0.22rem;
    border-top: 1px solid var(--project-line);
}

/* layout: 마이페이지 모달의 프로필 정보와 닉네임 수정 폼 */
body.user-profile-open {
    overflow: hidden;
}
.site-profile-dialog {
    width: min(34rem, calc(100% - 2rem));
    max-width: none;
    max-height: calc(100dvh - 2rem);
    margin: auto;
    padding: 0;
    overflow: hidden;
    border: 1px solid var(--project-line);
    border-radius: 1.5rem;
    color: var(--project-ink);
    background-color: rgba(255, 255, 255, 1);
    box-shadow: 0 28px 90px rgba(15, 23, 42, 0.24);
}
.site-profile-dialog::backdrop {
    background-color: rgba(15, 23, 42, 0.48);
    backdrop-filter: blur(4px);
    -webkit-backdrop-filter: blur(4px);
}
.site-profile-dialog__surface {
    max-height: calc(100dvh - 2rem);
    overflow-y: auto;
}
.site-profile-dialog__header {
    display: grid;
    grid-template-columns: minmax(0, 1fr) max-content;
    align-items: start;
    gap: 1rem;
    padding: 1.5rem 1.5rem 1rem;
}
.site-profile-dialog__eyebrow {
    margin-bottom: 0.35rem;
    color: var(--project-brand-strong);
    font-size: 0.68rem;
    font-weight: 750;
    letter-spacing: 0.14em;
}
.site-profile-dialog__title {
    margin: 0;
    font-size: 1.4rem;
    font-weight: 750;
    letter-spacing: -0.035em;
}
.site-profile-dialog__close {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    width: 2.5rem;
    height: 2.5rem;
    padding: 0;
    border: 1px solid var(--project-line);
    border-radius: 999px;
    color: var(--project-muted);
    background-color: rgba(255, 255, 255, 1);
}
.site-profile-dialog__body {
    padding: 0 1.5rem 1.5rem;
}
.site-profile-dialog__loading,
.site-profile-dialog__load-error {
    min-height: 14rem;
    padding: 3rem 1rem;
    color: var(--project-muted);
    text-align: center;
}
.site-profile-dialog__load-error i {
    display: block;
    margin-bottom: 0.75rem;
    color: rgba(225, 45, 63, 1);
    font-size: 1.6rem;
}
.site-profile-dialog__identity {
    padding: 1rem;
    border-radius: 1.15rem;
    background-color: var(--project-surface-soft);
}
.site-profile-dialog__nickname {
    display: block;
    overflow: hidden;
    color: var(--project-ink);
    font-size: 1rem;
    font-weight: 700;
    text-overflow: ellipsis;
    white-space: nowrap;
}
.site-profile-dialog__email {
    display: block;
    margin-top: 0.15rem;
    color: var(--project-muted);
    font-size: 0.8rem;
    overflow-wrap: anywhere;
}
.site-profile-dialog__stats {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.75rem;
    margin-top: 0.85rem;
}
.site-profile-dialog__stat {
    margin: 0;
    padding: 1rem;
    border: 1px solid var(--project-line);
    border-radius: 1rem;
    background-color: rgba(255, 255, 255, 1);
}
.site-profile-dialog__stat dt {
    margin-bottom: 0.35rem;
    color: var(--project-muted);
    font-size: 0.78rem;
    font-weight: 600;
}
.site-profile-dialog__stat dd {
    margin: 0;
    color: var(--project-ink);
    font-size: 1.35rem;
    font-weight: 750;
}
.site-profile-dialog__form {
    margin-top: 1.15rem;
    padding-top: 1.15rem;
    border-top: 1px solid var(--project-line);
}
.site-profile-dialog__label {
    margin-bottom: 0.45rem;
    color: var(--project-body);
    font-size: 0.86rem;
    font-weight: 650;
}
.site-profile-dialog__input-wrap {
    position: relative;
}
.site-profile-dialog__input {
    min-height: 3rem;
    padding-right: 3.8rem;
    border-color: rgba(15, 23, 42, 0.12);
    border-radius: 0.9rem;
    color: var(--project-ink);
    background-color: rgba(255, 255, 255, 1);
}
.site-profile-dialog__counter {
    position: absolute;
    top: 50%;
    right: 0.9rem;
    color: var(--project-muted);
    font-size: 0.76rem;
    transform: translateY(-50%);
    pointer-events: none;
}
.site-profile-dialog__guide {
    min-height: 1.3rem;
    margin: 0.45rem 0 0;
    color: var(--project-muted);
    font-size: 0.77rem;
}
.site-profile-dialog__message {
    margin: 0.85rem 0 0;
    border: 0;
    border-radius: 0.85rem;
    font-size: 0.82rem;
}
.site-profile-dialog__actions {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.65rem;
    margin-top: 1rem;
}
.site-profile-dialog__action {
    min-height: 2.8rem;
    border-radius: 0.9rem !important;
    white-space: nowrap;
}

/* interaction: 마이페이지 모달의 입력·버튼 상태 피드백 */
.site-profile-dialog__close:hover,
.site-profile-dialog__close:focus {
    color: var(--project-ink);
    background-color: var(--project-surface-soft);
}
.site-profile-dialog__input:focus {
    border-color: rgba(49, 130, 246, 0.7);
    box-shadow: 0 0 0 0.2rem rgba(49, 130, 246, 0.14);
}
.site-profile-dialog__input[aria-invalid="true"] {
    border-color: rgba(225, 45, 63, 0.7);
}
.site-profile-dialog__guide.is-valid {
    color: rgba(0, 145, 100, 1);
}
.site-profile-dialog__guide.is-invalid {
    color: rgba(225, 45, 63, 1);
}

/* 접근성: 마이페이지 모달 버튼의 키보드 포커스 표시 */
.site-profile-dialog button:focus-visible,
.site-profile-dialog input:focus-visible {
    outline: 3px solid rgba(49, 130, 246, 0.3);
    outline-offset: 2px;
}

/* layout: 화면 내 일반 액션과 내비게이션 버튼 공통 형태 */
.app-button {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    border-radius: 999px !important;
    font-weight: 650;
}
.site-nav__write,
.site-nav__logout {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.4rem;
    min-height: 2.75rem;
    padding: 0.55rem 0.95rem;
    font-weight: 650;
    transition: transform 0.18s ease, box-shadow 0.18s ease,
        background-color 0.18s ease;
}

/* layout: POST 로그아웃 폼이 내비게이션 버튼 정렬에 영향을 주지 않게 한다. */
.site-nav__logout-form {
    margin: 0;
}
.site-nav__write {
    border-color: var(--project-brand);
    color: rgba(255, 255, 255, 1);
    background-color: var(--project-brand);
    box-shadow: 0 8px 20px rgba(49, 130, 246, 0.22);
}

/* interaction: 글쓰기 버튼의 hover·focus 상태 */
.site-nav__write:hover,
.site-nav__write:focus {
    border-color: var(--project-brand-strong);
    color: rgba(255, 255, 255, 1);
    background-color: var(--project-brand-strong);
    transform: translateY(-1px);
}
.site-nav__logout {
    border-color: var(--project-line);
    color: var(--project-body);
    background-color: rgba(255, 255, 255, 0.7);
}

/* interaction: 로그아웃 버튼의 hover·focus 상태 */
.site-nav__logout:hover,
.site-nav__logout:focus {
    color: var(--project-ink);
    background-color: var(--project-surface-soft);
    transform: translateY(-1px);
}

/* layout: 공통 푸터 배경과 링크 */
.site-footer {
    border-color: var(--project-line) !important;
    background-color: rgba(255, 255, 255, 0.72) !important;
    backdrop-filter: blur(14px);
    -webkit-backdrop-filter: blur(14px);
}
.site-footer__link {
    color: var(--project-muted);
    font-weight: 550;
    letter-spacing: -0.01em;
}

/* interaction: 공통 푸터 링크의 hover·focus 상태 */
.site-footer__link:hover,
.site-footer__link:focus {
    color: var(--project-brand-strong);
}

/* 반응형layout: 모바일 내비게이션·헤더·마이페이지 모달 밀도 조정 */
@media (max-width: 575.98px) {
    .site-nav {
        padding-right: 0;
        padding-left: 0;
    }
    .site-nav__inner {
        gap: 0.5rem;
        padding-right: 0.75rem;
        padding-left: 0.75rem;
    }
    .site-nav-dropdown > summary {
        padding-right: 0.55rem;
        padding-left: 0.55rem;
    }
    .site-nav__actions {
        gap: 0.35rem;
    }
    .site-nav__write,
    .site-nav__logout {
        min-height: 2.5rem;
        padding: 0.45rem 0.7rem;
        font-size: 0.8rem;
    }
    .intro-header__subtitle {
        font-size: 0.86rem;
    }
    .site-profile-dialog {
        width: calc(100% - 1rem);
        max-height: calc(100dvh - 1rem);
        border-radius: 1.15rem;
    }
    .site-profile-dialog__surface {
        max-height: calc(100dvh - 1rem);
    }
    .site-profile-dialog__header {
        padding: 1.2rem 1rem 0.85rem;
    }
    .site-profile-dialog__body {
        padding: 0 1rem 1rem;
    }
    .site-profile-dialog__stat {
        padding: 0.85rem;
    }
}

/* 반응형layout: 320px 화면에서도 메뉴와 글쓰기·로그아웃 액션을 한 줄에 유지 */
@media (max-width: 359.98px) {
    .site-nav > .site-nav__inner {
        gap: 0.25rem;
        padding-right: 0.35rem;
        padding-left: 0.35rem;
    }
    .site-nav-dropdown > summary {
        gap: 0.2rem;
        padding-right: 0.2rem;
        padding-left: 0.2rem;
        font-size: 0.74rem;
        white-space: nowrap;
    }
    .site-nav__actions {
        gap: 0.2rem;
    }
    .site-nav__write,
    .site-nav__logout {
        gap: 0.2rem;
        padding-right: 0.35rem;
        padding-left: 0.35rem;
        font-size: 0.68rem;
    }
}

/* 접근성: 사용자가 모션 감소를 선택한 경우 */
@media (prefers-reduced-motion: reduce) {
    html {
        scroll-behavior: auto;
    }
    *,
    *::before,
    *::after {
        transition-duration: 0.01ms !important;
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
    }
}