/* ============================================
   Reset & Base
   ============================================ */
*,
*::before,
*::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --color-bg: #ffffff;
    --color-text: #111111;
    --color-text-muted: #888888;
    --color-line: #e8e8e8;
    --color-placeholder-bg: #f4f4f4;
    --color-placeholder-text: #cccccc;

    /* 이름 (영문 세리프) */
    --font-serif: 'Playfair Display', 'Times New Roman', serif;
    /* 본문 기본 (한글·영문 겸용) */
    --font-sans: 'Pretendard Variable', Pretendard, -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;
    /* 프로젝트 제목·페이지 제목 (영문 Poppins + 한글 Noto Sans KR) */
    --font-title: 'Poppins', 'Noto Sans KR', 'Pretendard Variable', Pretendard, -apple-system, sans-serif;
    /* 카테고리·라벨 (영문 Poppins) */
    --font-category: 'Poppins', -apple-system, BlinkMacSystemFont, 'Helvetica Neue', sans-serif;

    --header-height: 64px;
    --content-max-width: 1400px;
    --side-padding: 60px;

    /* ============================================
       글씨 크기 변수 (Font Sizes)
       여기서 값을 수정하면 사이트 전체에 반영됩니다.
       ============================================ */

    /* --- 큰 제목 --- */
    --fs-hero-title: 4.5rem;       /* 홈 메인 타이틀 */
    --fs-page-title: 3rem;         /* About/Project/Contact 페이지 제목 */
    --fs-about-name: 2.5rem;       /* About 페이지 이름 */
    --fs-detail-title: 2.5rem;     /* 프로젝트 상세 제목 */
    --fs-contact-lead: 1.75rem;    /* Contact 인용 문구 */
    --fs-intro-text: 1.5rem;       /* 홈 영문 키워드 라인 */
    --fs-intro-description: 1rem;  /* 홈 한글 설명 (작게) */

    /* --- 프로젝트 카드 --- */
    --fs-project-title: 1.125rem;  /* 프로젝트 카드 제목 (작게 조정됨) */

    /* --- 본문 --- */
    --fs-body: 1rem;               /* About 바이오, 상세 본문, Contact 값 */
    --fs-body-sm: 0.9375rem;       /* 메타 리스트, 상세 메타, 영문 설명 */

    /* --- 네비 / 로고 / 소제목 --- */
    --fs-logo: 1rem;               /* 헤더 로고 */
    --fs-nav: 0.875rem;            /* 헤더 네비 링크 */
    --fs-subtitle: 0.875rem;       /* Hero 서브타이틀, About 역할, 상세 서브타이틀 */

    /* --- 라벨 / 캡션 (대문자 작은 글씨) --- */
    --fs-label: 0.75rem;           /* 카테고리, 메타 키, Contact 라벨, Footer, 상세 네비 */

    /* --- 기타 --- */
    --fs-arrow: 1.5rem;            /* 갤러리 화살표 */
    --fs-image-placeholder: 0.75rem;   /* 이미지 자리 라벨 */
    --fs-thumb-placeholder: 0.625rem;  /* 썸네일 자리 라벨 */
}

html {
    font-size: 16px;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
}

body {
    background-color: var(--color-bg);
    color: var(--color-text);
    font-family: var(--font-sans);
    font-weight: 300;
    line-height: 1.6;
    letter-spacing: 0.02em;
}

a {
    color: inherit;
    text-decoration: none;
    transition: opacity 0.2s ease;
}

a:hover {
    opacity: 0.6;
}

ul {
    list-style: none;
}

img {
    max-width: 100%;
    display: block;
}

/* ============================================
   Header
   ============================================ */
.header {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    height: var(--header-height);
    background-color: var(--color-bg);
    border-bottom: 1px solid var(--color-line);
    z-index: 100;
}

.header-inner {
    max-width: var(--content-max-width);
    height: 100%;
    margin: 0 auto;
    padding: 0 var(--side-padding);
    display: flex;
    align-items: center;
    justify-content: space-between;
}

.logo {
    font-family: var(--font-sans);
    font-size: var(--fs-logo);
    font-weight: 500;
    letter-spacing: 0.25em;
}

.nav {
    display: flex;
    gap: 48px;
}

.nav-link {
    font-size: var(--fs-nav);
    font-weight: 400;
    letter-spacing: 0.15em;
    text-transform: uppercase;
    position: relative;
    padding-bottom: 4px;
}

.nav-link.active::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 1px;
    background-color: var(--color-text);
}

/* ============================================
   Main Layout
   ============================================ */
.main {
    padding-top: var(--header-height);
    min-height: calc(100vh - var(--header-height));
}

.main.page {
    padding-top: calc(var(--header-height) + 80px);
    padding-bottom: 120px;
}

.page-section {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--side-padding);
}

.page-title {
    font-family: var(--font-title);
    font-size: var(--fs-page-title);
    font-weight: 300;
    letter-spacing: 0.02em;
    margin-bottom: 80px;
}

/* ============================================
   Image Placeholder (이미지 자리 표시자)
   ============================================ */
.image-placeholder {
    width: 100%;
    aspect-ratio: 4 / 3;
    background-color: var(--color-placeholder-bg);
    display: flex;
    align-items: center;
    justify-content: center;
    color: var(--color-placeholder-text);
    font-size: var(--fs-image-placeholder);
    letter-spacing: 0.3em;
    font-weight: 400;
}

.image-placeholder.portrait {
    aspect-ratio: 3 / 4;
}

/* ============================================
   Home — 16:9 히어로 슬라이드쇼 + 스크롤 인트로
   ============================================ */
.main.home {
    padding-top: var(--header-height);
}

/* 풀폭 시네마틱 비율 (21:9) — 페이지 가로 전체에 맞춤
   - 가로: 뷰포트 전체 너비
   - 세로: 21:9 비율로 자동 계산되며, 뷰포트를 넘지 않도록 제한 */
.home-hero {
    position: relative;
    width: 100%;
    aspect-ratio: 21 / 9;
    max-height: calc(100vh - var(--header-height));
    margin: 0;
    overflow: hidden;
    background-color: var(--color-placeholder-bg);
}

.home-hero-image {
    position: relative;
    width: 100%;
    height: 100%;
}

/* 슬라이드: 모두 같은 자리에 겹쳐두고, 활성화된 것만 보이게 페이드 */
.hero-slide {
    position: absolute;
    inset: 0;
    opacity: 0;
    transition: opacity 1.2s ease;
    pointer-events: none;
}

.hero-slide.is-active {
    opacity: 1;
    pointer-events: auto;
}

.hero-slide .image-placeholder,
.hero-slide img {
    width: 100%;
    height: 100%;
    aspect-ratio: auto;
}

.hero-slide .image-placeholder {
    font-size: var(--fs-image-placeholder);
}

.hero-slide img {
    object-fit: cover;
}

/* 스크롤 후 나타나는 인트로 영역 */
.home-intro {
    max-width: 760px;
    margin: 0 auto;
    padding: 180px var(--side-padding) 200px;
    text-align: center;
}

.home-name {
    font-family: var(--font-serif);
    font-size: var(--fs-hero-title);
    font-weight: 300;
    line-height: 1.1;
    margin-bottom: 32px;
}

.home-role {
    font-size: var(--fs-subtitle);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 120px;
}

.home-keywords {
    font-family: var(--font-category);
    font-size: var(--fs-intro-text);
    font-weight: 300;
    line-height: 1.6;
    margin-bottom: 96px;
}

.home-cta-group {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 56px;
}

.home-cta {
    display: inline-block;
    font-size: var(--fs-label);
    letter-spacing: 0.3em;
    text-transform: uppercase;
    border-bottom: 1px solid var(--color-text);
    padding-left: 0.3em;
    padding-bottom: 3px;
    transition: opacity 0.2s ease, letter-spacing 0.3s ease;
}

.home-cta:hover {
    letter-spacing: 0.4em;
}

/* ============================================
   About
   ============================================ */
.about-grid {
    max-width: 760px;
    margin: 0 auto;
}

.about-content {
    padding-top: 0;
}

.about-name {
    font-family: var(--font-serif);
    font-size: var(--fs-about-name);
    font-weight: 300;
    margin-bottom: 16px;
    text-align: center;
}

.about-role {
    font-size: var(--fs-subtitle);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-bottom: 96px;
    text-align: center;
}

.about-bio {
    font-size: var(--fs-body);
    line-height: 1.9;
    color: var(--color-text);
    margin-bottom: 96px;
}

.about-bio p + p {
    margin-top: 20px;
}

.about-meta {
    display: flex;
    flex-direction: column;
    gap: 72px;
}

.meta-item {
    display: grid;
    grid-template-columns: 140px 1fr;
    gap: 40px;
}

.meta-title {
    font-size: var(--fs-label);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    font-weight: 500;
    color: var(--color-text-muted);
    padding-top: 4px;
}

.meta-list {
    display: flex;
    flex-direction: column;
    gap: 8px;
}

.meta-list li {
    font-size: var(--fs-body-sm);
    line-height: 1.6;
    display: flex;
    gap: 16px;
    align-items: baseline;
}

.meta-list li .year {
    flex: 0 0 auto;
    min-width: 5em;
    white-space: nowrap;
}

.meta-list li .entry {
    flex: 1 1 auto;
}

/* ============================================
   Project
   ============================================ */
.project-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 60px 40px;
}

.project-card {
    width: 100%;
}

.project-link {
    display: block;
    transition: opacity 0.3s ease;
}

.project-link:hover {
    opacity: 1;
}

.project-image {
    width: 100%;
    margin-bottom: 20px;
    overflow: hidden;
}

.project-image .image-placeholder {
    transition: transform 0.6s ease;
}

.project-link:hover .image-placeholder {
    transform: scale(1.03);
}

.project-info {
    padding: 4px 0;
}

.project-title {
    font-family: var(--font-title);
    font-size: var(--fs-project-title);
    font-weight: 400;
    margin-bottom: 4px;
}

.project-category {
    font-family: var(--font-category);
    font-size: var(--fs-label);
    letter-spacing: 0.15em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

/* ============================================
   Project Detail
   ============================================ */
.main.detail {
    padding-top: var(--header-height);
    padding-bottom: 120px;
}

/* 메인 이미지 + 썸네일 갤러리 */
.detail-gallery {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 40px var(--side-padding) 0;
}

.detail-main-image {
    position: relative;
    width: 100%;
    max-width: 900px;
    margin: 0 auto 24px;
}

.detail-main-placeholder {
    /* 헤더 + 패딩 + 썸네일 + 여유 공간을 빼고 한 화면에 들어오도록 제한 */
    aspect-ratio: 16 / 10;
    max-height: calc(100vh - var(--header-height) - 280px);
    min-height: 320px;
}

.gallery-arrow {
    position: absolute;
    top: 0;
    bottom: 0;
    width: 25%;
    background: none;
    border: none;
    cursor: pointer;
    display: flex;
    align-items: center;
    z-index: 2;
    opacity: 0;
    transition: opacity 0.25s ease;
    padding: 0 16px;
}

.gallery-arrow:hover {
    opacity: 1;
}

.gallery-arrow.prev {
    left: 0;
    justify-content: flex-start;
}

.gallery-arrow.next {
    right: 0;
    justify-content: flex-end;
}

.arrow-icon {
    font-size: var(--fs-arrow);
    line-height: 1;
    color: var(--color-text);
    font-weight: 300;
}

.detail-thumbnails {
    display: flex;
    justify-content: center;
    flex-wrap: wrap;
    gap: 12px;
    max-width: 100%;
    margin: 0 auto;
}

/* placeholder 안에 img가 들어오면 컨테이너를 꽉 채우도록 */
.image-placeholder img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    display: block;
}

.thumb-item {
    background: none;
    border: none;
    padding: 0;
    cursor: pointer;
    opacity: 0.4;
    transition: opacity 0.3s ease;
    flex: 0 0 105px;
    width: 105px;
}

.thumb-item:hover,
.thumb-item.active {
    opacity: 1;
}

.thumb-placeholder {
    aspect-ratio: 4 / 3;
    font-size: var(--fs-thumb-placeholder);
}

/* 텍스트 영역 */
.detail-info {
    margin-top: 120px;
}

.detail-inner {
    max-width: 760px;
    margin: 0 auto;
    padding: 0 var(--side-padding);
}

.detail-header {
    margin-bottom: 64px;
}

.detail-title {
    font-family: var(--font-title);
    font-size: var(--fs-detail-title);
    font-weight: 300;
    line-height: 1.2;
    margin-bottom: 12px;
    /* 세리프+한글 fallback 폰트의 좌측 여백 optical 보정 */
    margin-left: -0.04em;
}

.detail-subtitle {
    font-family: var(--font-category);
    font-size: var(--fs-subtitle);
    color: var(--color-text-muted);
    letter-spacing: 0.05em;
}

.detail-meta {
    display: flex;
    flex-direction: column;
    margin-bottom: 80px;
}

.meta-row {
    display: grid;
    grid-template-columns: 120px 1fr;
    gap: 32px;
    padding: 8px 0;
    font-size: var(--fs-body-sm);
}

.meta-key {
    font-size: var(--fs-label);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    padding-top: 2px;
}

.meta-val {
    color: var(--color-text);
}

.detail-description {
    margin-bottom: 100px;
}

/* 유튜브 영상 임베드 (썸네일 → 클릭 시 iframe으로 교체) */
.detail-video-section {
    margin-bottom: 100px;
    display: flex;
    flex-direction: column;
    gap: 32px;
}

.video-embed {
    width: 100%;
}

.video-thumb {
    position: relative;
    display: block;
    width: 100%;
    aspect-ratio: 16 / 9;
    border: 0;
    padding: 0;
    margin: 0;
    background-color: #000;
    cursor: pointer;
    overflow: hidden;
}

.video-thumb img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: opacity 0.3s ease, transform 0.6s ease;
}

.video-thumb:hover img {
    opacity: 0.9;
    transform: scale(1.02);
}

.video-play-icon {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    width: 68px;
    height: 48px;
    pointer-events: none;
    transition: transform 0.2s ease, filter 0.2s ease;
    filter: drop-shadow(0 2px 8px rgba(0, 0, 0, 0.35));
}

.video-thumb:hover .video-play-icon {
    transform: translate(-50%, -50%) scale(1.08);
}

.video-caption {
    font-size: var(--fs-label);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-text-muted);
    margin-top: 12px;
}

.video-embed iframe {
    width: 100%;
    aspect-ratio: 16 / 9;
    border: 0;
    display: block;
}

/* 임베드 차단된 영상 폴백 박스 */
.video-fallback {
    width: 100%;
    aspect-ratio: 16 / 9;
    background-color: var(--color-placeholder-bg);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 16px;
    text-align: center;
    padding: 24px;
}

.video-fallback p {
    font-size: var(--fs-body-sm);
    color: var(--color-text-muted);
    margin: 0;
}

.video-fallback a {
    font-size: var(--fs-label);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    color: var(--color-text);
    border-bottom: 1px solid var(--color-text);
    padding-bottom: 4px;
}

/* ============================================
   Lightbox (이미지 풀스크린 모달)
   ============================================ */
.lightbox {
    position: fixed;
    inset: 0;
    background-color: rgba(0, 0, 0, 0.92);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 60px;
    animation: lightbox-fade-in 0.2s ease;
}

.lightbox[hidden] {
    display: none;
}

@keyframes lightbox-fade-in {
    from { opacity: 0; }
    to   { opacity: 1; }
}

.lightbox-content {
    max-width: 90vw;
    max-height: 85vh;
    width: 100%;
    display: flex;
    align-items: center;
    justify-content: center;
    pointer-events: none; /* 배경 클릭으로 닫히도록 — 안의 이미지는 다시 활성화 */
}

.lightbox-content > * {
    pointer-events: auto;
    max-width: 100%;
    max-height: 85vh;
}

.lightbox-content .image-placeholder {
    width: 100%;
    aspect-ratio: 4 / 3;
    max-height: 85vh;
    background-color: #1a1a1a;
    color: #555;
    font-size: 1rem;
}

.lightbox-content img {
    max-width: 100%;
    max-height: 85vh;
    object-fit: contain;
    display: block;
}

.lightbox-close,
.lightbox-arrow {
    position: absolute;
    background: none;
    border: 0;
    color: #fff;
    cursor: pointer;
    padding: 16px;
    opacity: 0.7;
    transition: opacity 0.2s ease, transform 0.2s ease;
    line-height: 1;
}

.lightbox-close:hover,
.lightbox-arrow:hover {
    opacity: 1;
}

.lightbox-close {
    top: 12px;
    right: 16px;
    font-size: 2.25rem;
    font-weight: 200;
}

.lightbox-arrow {
    top: 50%;
    transform: translateY(-50%);
    font-size: 3rem;
    font-weight: 200;
}

.lightbox-arrow:hover {
    transform: translateY(-50%) scale(1.1);
}

.lightbox-arrow.prev { left: 16px; }
.lightbox-arrow.next { right: 16px; }

.lightbox-counter {
    position: absolute;
    bottom: 24px;
    left: 50%;
    transform: translateX(-50%);
    color: #fff;
    font-size: var(--fs-label);
    letter-spacing: 0.3em;
    opacity: 0.6;
}

/* 더블클릭 가능한 이미지에 커서 힌트 */
.detail-main-placeholder,
.thumb-placeholder {
    cursor: zoom-in;
}

@media (max-width: 640px) {
    .lightbox {
        padding: 16px;
    }
    .lightbox-arrow {
        font-size: 2rem;
        padding: 8px;
    }
    .lightbox-arrow.prev { left: 4px; }
    .lightbox-arrow.next { right: 4px; }
}

.detail-description p {
    font-size: var(--fs-body);
    line-height: 1.9;
    margin-bottom: 24px;
}

.detail-description p:last-child {
    margin-bottom: 0;
}

.description-en {
    color: var(--color-text-muted);
    font-size: var(--fs-body-sm);
    margin-top: 32px;
}

.detail-nav {
    display: flex;
    justify-content: space-between;
    padding-top: 40px;
}

.detail-nav-link {
    font-size: var(--fs-label);
    letter-spacing: 0.2em;
    text-transform: uppercase;
    font-weight: 400;
}

/* ============================================
   Contact
   ============================================ */
.contact-section {
    max-width: 900px;
}

.contact-content {
    padding-top: 100px;
}

.contact-lead {
    font-family: var(--font-title);
    font-size: var(--fs-contact-lead);
    font-weight: 300;
    line-height: 1.5;
    margin-bottom: 80px;
}

.contact-list {
    display: flex;
    flex-direction: column;
}

.contact-item {
    display: grid;
    grid-template-columns: 160px 1fr;
    align-items: center;
    padding: 14px 0;
}

.contact-label {
    font-size: var(--fs-label);
    letter-spacing: 0.25em;
    text-transform: uppercase;
    color: var(--color-text-muted);
}

.contact-value {
    font-size: var(--fs-body);
    letter-spacing: 0.02em;
}

/* ============================================
   Footer
   ============================================ */
.footer {
    border-top: 1px solid var(--color-line);
    padding: 40px 0;
}

.footer-inner {
    max-width: var(--content-max-width);
    margin: 0 auto;
    padding: 0 var(--side-padding);
    display: flex;
    justify-content: center;
}

.footer-text {
    font-size: var(--fs-label);
    letter-spacing: 0.1em;
    color: var(--color-text-muted);
}

/* ============================================
   Responsive
   ============================================ */
@media (max-width: 1024px) {
    :root {
        --side-padding: 40px;

        /* 태블릿 사이즈 오버라이드 — 여기서 값을 바꾸면 태블릿에서만 적용됩니다. */
        --fs-hero-title: 3.5rem;
    }

    .project-grid {
        grid-template-columns: repeat(2, 1fr);
    }
}

@media (max-width: 640px) {
    :root {
        --side-padding: 24px;
        --header-height: 64px;

        /* 모바일 사이즈 오버라이드 — 여기서 값을 바꾸면 모바일에서만 적용됩니다. */
        --fs-nav: 0.75rem;
        --fs-logo: 0.875rem;
        --fs-hero-title: 2.5rem;
        --fs-page-title: 2rem;
        --fs-detail-title: 1.875rem;
        --fs-intro-text: 1.125rem;
        --fs-contact-lead: 1.25rem;
    }

    .nav {
        gap: 24px;
    }

    .page-title {
        margin-bottom: 48px;
    }

    .project-grid {
        grid-template-columns: 1fr;
        gap: 40px;
    }

    .meta-item,
    .contact-item,
    .meta-row {
        grid-template-columns: 1fr;
        gap: 8px;
    }

    .detail-thumbnails {
        gap: 8px;
    }

    .detail-info {
        margin-top: 80px;
    }
}