/* ============================================================
   NULL GALLERY — Global Stylesheet
   Inspired by Leeum Museum of Art's minimal luxury aesthetic
   ============================================================ */

/* ── TOKENS ─────────────────────────────────────────────── */
:root {
    --black:   #0a0a0a;
    --white:   #f8f8f6;
    --grey-1:  #1a1a1a;
    --grey-2:  #2e2e2e;
    --grey-3:  #6b6b6b;
    --grey-4:  #aaaaaa;
    --grey-5:  #e2e2e0;
    --grey-6:  #f2f2f0;

    --logo:     'Bebas Neue', 'Noto Sans KR', sans-serif;
    --serif:    'Noto Sans KR', sans-serif;
    --sans:     'Noto Sans KR', sans-serif;

    --header-h: 72px;
    --transition: 0.45s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ── RESET ───────────────────────────────────────────────── */
*, *::before, *::after { margin: 0; padding: 0; box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
    background: var(--white);
    color: var(--black);
    font-family: var(--sans);
    font-size: 15px;
    line-height: 1.7;
    -webkit-font-smoothing: antialiased;
}
body.page-inner { padding-top: var(--header-h); }
a { text-decoration: none; color: inherit; }
img { display: block; width: 100%; }
button { background: none; border: none; cursor: pointer; }

/* ── HEADER ─────────────────────────────────────────────── */
.header {
    position: fixed;
    top: 0; left: 0;
    width: 100%;
    height: var(--header-h);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 48px;
    z-index: 900;
    transition: background var(--transition), border-color var(--transition);
}
.header.transparent {
    background: transparent;
    border-bottom: 1px solid rgba(255,255,255,0.12);
}
.header.scrolled,
.header.header--dark {
    background: var(--white);
    border-bottom: 1px solid var(--grey-5);
}

.header-logo a {
    font-family: var(--logo);
    font-size: 1.5rem;
    font-weight: 900;
    letter-spacing: 6px;
    line-height: 1;
    color: var(--black);
    transition: color var(--transition);
    text-transform: uppercase;
}
.header.transparent .header-logo a { color: var(--white); }

.header-nav ul { display: flex; gap: 40px; list-style: none; }
.header-nav a {
    font-size: 0.8rem;
    letter-spacing: 2px;
    color: var(--grey-3);
    transition: color var(--transition);
    text-transform: uppercase;
}
.header.transparent .header-nav a { color: rgba(255,255,255,0.65); }
.header-nav a:hover,
.header-nav a.active { color: var(--black); }
.header.transparent .header-nav a:hover { color: var(--white); }

.header-util {
    display: flex;
    align-items: center;
    gap: 20px;
    font-size: 0.75rem;
    letter-spacing: 2px;
    color: var(--grey-3);
}
.header.transparent .header-util { color: rgba(255,255,255,0.65); }

.menu-btn {
    display: flex;
    flex-direction: column;
    gap: 5px;
    padding: 4px 0;
}
.menu-btn span {
    display: block;
    width: 22px;
    height: 1px;
    background: var(--black);
    transition: background var(--transition);
}
.header.transparent .menu-btn span { background: var(--white); }

/* ── MENU OVERLAY ─────────────────────────────────────── */
.menu-overlay {
    position: fixed;
    inset: 0;
    background: var(--black);
    z-index: 999;
    display: flex;
    flex-direction: column;
    justify-content: center;
    padding: 80px;
    opacity: 0;
    pointer-events: none;
    transition: opacity 0.5s ease;
}
.menu-overlay.open { opacity: 1; pointer-events: all; }

.menu-close {
    position: absolute;
    top: 28px; right: 48px;
    font-size: 1.2rem;
    color: var(--white);
    opacity: 0.5;
    transition: opacity 0.2s;
}
.menu-close:hover { opacity: 1; }

.overlay-nav ul { list-style: none; }
.overlay-link {
    display: block;
    font-family: var(--sans);
    font-size: clamp(2rem, 4vw, 3.5rem);
    font-weight: 700;
    color: var(--white);
    line-height: 1.2;
    padding: 14px 0;
    border-bottom: 1px solid rgba(255,255,255,0.08);
    transition: opacity 0.3s;
    letter-spacing: 4px;
}
.overlay-link:hover { opacity: 0.5; }
.overlay-link span {
    display: block;
    font-family: var(--sans);
    font-size: 0.75rem;
    letter-spacing: 3px;
    color: var(--grey-4);
    margin-top: 4px;
}

.overlay-info {
    margin-top: 60px;
    font-size: 0.8rem;
    color: var(--grey-4);
    letter-spacing: 1px;
    line-height: 2;
}

/* ── HERO (LANDING) ──────────────────────────────────────── */
.hero {
    position: relative;
    height: 100vh;
    min-height: 600px;
    overflow: hidden;
    display: flex;
    align-items: flex-end;
    padding: 0 48px 80px;
}
/* ── HERO SLIDESHOW ─────────────────────────────────────── */
.hero-slideshow {
    position: absolute;
    inset: 0;
    z-index: 0;
}

.hero-slide {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    object-fit: cover;
    opacity: 0;
    transition: opacity 1.8s ease-in-out;
}

.hero-slide.active {
    opacity: 1;
}

.hero-overlay {
    position: absolute;
    inset: 0;
    background: linear-gradient(to top, rgba(0,0,0,0.72) 0%, rgba(0,0,0,0.15) 60%, transparent 100%);
    z-index: 1;
    pointer-events: none;
}

.hero-content {
    position: relative;
    z-index: 2;
    color: var(--white);
    max-width: 700px;
}
.hero-label {
    font-size: 0.72rem;
    letter-spacing: 3px;
    color: rgba(255,255,255,0.6);
    margin-bottom: 16px;
    text-transform: uppercase;
}
.hero-title {
    font-family: var(--sans);
    font-size: clamp(3.5rem, 7vw, 7rem);
    font-weight: 700;
    line-height: 1.0;
    letter-spacing: -1px;
    margin-bottom: 20px;
}
.hero-title em { font-style: normal; opacity: 0.75; font-weight: 300; }
.hero-sub {
    font-size: 0.85rem;
    letter-spacing: 2px;
    opacity: 0.65;
    margin-bottom: 36px;
}
.hero-cta {
    display: inline-block;
    padding: 14px 36px;
    border: 1px solid rgba(255,255,255,0.45);
    font-size: 0.78rem;
    letter-spacing: 3px;
    text-transform: uppercase;
    color: var(--white);
    transition: background 0.3s, border-color 0.3s;
}
.hero-cta:hover { background: rgba(255,255,255,0.12); border-color: var(--white); }

.hero-scroll-hint {
    position: absolute;
    right: 48px; bottom: 80px;
    z-index: 2;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 12px;
    color: rgba(255,255,255,0.4);
    font-size: 0.65rem;
    letter-spacing: 2px;
    writing-mode: vertical-rl;
}
.scroll-line {
    width: 1px;
    height: 60px;
    background: rgba(255,255,255,0.25);
    animation: scrollPulse 2s ease-in-out infinite;
}
@keyframes scrollPulse {
    0%, 100% { opacity: 0.25; transform: scaleY(1); }
    50% { opacity: 0.8; transform: scaleY(0.5); transform-origin: top; }
}

/* ── ABOUT STRIP ─────────────────────────────────────────── */
.about-strip {
    padding: 80px 48px;
    border-bottom: 1px solid var(--grey-5);
}
.about-strip-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
    gap: 60px;
}
.about-text h2 {
    font-family: var(--sans);
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: 3px;
    margin-bottom: 20px;
}
.about-text p {
    max-width: 560px;
    color: var(--grey-3);
    line-height: 1.9;
    font-size: 0.9rem;
}
.strip-link {
    font-size: 0.8rem;
    letter-spacing: 2px;
    border-bottom: 1px solid var(--black);
    padding-bottom: 2px;
    white-space: nowrap;
    transition: opacity 0.3s;
}
.strip-link:hover { opacity: 0.45; }

/* ── EXHIBITIONS SECTION (LANDING) ───────────────────────── */
.section-exhibitions {
    padding: 80px 48px 100px;
    max-width: 1400px;
    margin: 0 auto;
}
.section-header {
    display: flex;
    justify-content: space-between;
    align-items: baseline;
    margin-bottom: 48px;
    border-bottom: 1px solid var(--grey-5);
    padding-bottom: 20px;
}
.section-title {
    font-family: var(--sans);
    font-size: 1.6rem;
    font-weight: 700;
    letter-spacing: 2px;
}
.section-all {
    font-size: 0.75rem;
    letter-spacing: 2px;
    color: var(--grey-3);
    transition: color 0.3s;
}
.section-all:hover { color: var(--black); }

.exhibition-grid {
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 40px;
}
.exhibit-card { display: block; }
.exhibit-img-wrap {
    overflow: hidden;
    margin-bottom: 20px;
    aspect-ratio: 3 / 2;
    background: var(--grey-6);
}
.exhibit-img {
    width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    background-color: var(--grey-2);
    transition: transform 0.7s var(--transition);
}
.exhibit-card:hover .exhibit-img { transform: scale(1.04); }
.exhibit-info { padding: 0 4px; }
.exhibit-label {
    font-size: 0.7rem;
    letter-spacing: 2px;
    color: var(--grey-4);
    margin-bottom: 8px;
    text-transform: uppercase;
}
.exhibit-info h3 {
    font-family: var(--sans);
    font-size: 1.5rem;
    font-weight: 600;
    letter-spacing: 1px;
    margin-bottom: 8px;
}
.exhibit-period { font-size: 0.8rem; color: var(--grey-3); }
.exhibit-venue  { font-size: 0.75rem; color: var(--grey-4); margin-top: 4px; }

/* ── EVENT STRIP ─────────────────────────────────────────── */
.event-strip {
    background: var(--black);
    padding: 72px 48px;
}
.event-strip-inner {
    max-width: 1400px;
    margin: 0 auto;
    display: flex;
    align-items: center;
    gap: 48px;
}
.event-tag {
    font-size: 0.68rem;
    letter-spacing: 3px;
    color: var(--grey-4);
    white-space: nowrap;
    border: 1px solid var(--grey-2);
    padding: 6px 14px;
}
.event-text { flex: 1; }
.event-text h3 {
    font-family: var(--sans);
    font-size: 1.5rem;
    font-weight: 600;
    color: var(--white);
    margin-bottom: 8px;
}
.event-text p { font-size: 0.85rem; color: var(--grey-4); line-height: 1.8; }
.event-cta {
    display: inline-block;
    padding: 14px 36px;
    border: 1px solid var(--grey-2);
    font-size: 0.75rem;
    letter-spacing: 2px;
    color: var(--white);
    white-space: nowrap;
    transition: border-color 0.3s, background 0.3s;
}
.event-cta:hover { border-color: var(--white); background: rgba(255,255,255,0.06); }

/* ── PAGE HERO (INNER PAGES) ─────────────────────────────── */
.page-hero {
    border-bottom: 1px solid var(--grey-5);
    padding: 64px 48px 40px;
    margin-bottom: 0;
}
.page-hero-inner h1 {
    font-family: var(--sans);
    font-size: clamp(2.5rem, 5vw, 4rem);
    font-weight: 700;
    letter-spacing: 2px;
    line-height: 1.1;
}
.page-hero-inner h1 em { font-style: normal; opacity: 0.3; margin-left: 20px; font-size: 0.6em; font-weight: 300; }

/* ── FILTER TABS ─────────────────────────────────────────── */
.filter-tabs {
    display: flex;
    gap: 0;
    padding: 0 48px;
    border-bottom: 1px solid var(--grey-5);
}
.tab {
    padding: 20px 28px;
    font-size: 0.78rem;
    letter-spacing: 1.5px;
    color: var(--grey-4);
    border-bottom: 2px solid transparent;
    margin-bottom: -1px;
    transition: color 0.3s, border-color 0.3s;
}
.tab.active, .tab:hover { color: var(--black); border-bottom-color: var(--black); }

/* ── EXHIBITION LIST ─────────────────────────────────────── */
.ex-list { max-width: 1400px; margin: 0 auto; padding: 0 48px 100px; }
.ex-item { padding: 0; }
.ex-item-inner {
    display: grid;
    grid-template-columns: 360px 1fr;
    gap: 48px;
    padding: 52px 0;
    align-items: center;
    transition: opacity 0.3s;
}
.ex-item-inner:hover { opacity: 0.72; }
.ex-img-wrap {
    position: relative;
    overflow: hidden;
    aspect-ratio: 4/3;
    background: var(--grey-6);
}
.ex-img {
    width: 100%; height: 100%;
    background-size: cover;
    background-position: center;
    background-color: var(--grey-2);
    transition: transform 0.6s var(--transition);
}
.ex-item-inner:hover .ex-img { transform: scale(1.04); }
.ex-badge {
    position: absolute;
    top: 16px; left: 16px;
    font-size: 0.65rem;
    letter-spacing: 2px;
    padding: 5px 12px;
    text-transform: uppercase;
}
.ex-badge.current  { background: var(--black); color: var(--white); }
.ex-badge.upcoming { background: transparent; color: var(--black); border: 1px solid var(--black); }
.ex-badge.past     { background: var(--grey-6); color: var(--grey-3); }

.ex-meta {
    display: flex;
    justify-content: space-between;
    align-items: flex-end;
}
.ex-meta h2 {
    font-family: var(--sans);
    font-size: clamp(1.6rem, 2.5vw, 2.4rem);
    font-weight: 700;
    letter-spacing: 0px;
    margin-bottom: 12px;
}
.ex-artist { font-size: 0.8rem; color: var(--grey-4); margin-bottom: 8px; }
.ex-period  { font-size: 0.85rem; color: var(--grey-3); }
.ex-arrow {
    font-size: 1.4rem;
    color: var(--grey-5);
    transition: color 0.3s, transform 0.3s;
}
.ex-item-inner:hover .ex-arrow { color: var(--black); transform: translateX(6px); }
.ex-divider { height: 1px; background: var(--grey-5); }

/* ── VISIT PAGE ──────────────────────────────────────────── */
.visit-main { padding-bottom: 120px; }
.visit-map-wrap {
    width: 100%;
    overflow: hidden;
    border-bottom: 1px solid var(--grey-5);
}
.visit-map-wrap iframe { display: block; }

.visit-info-grid {
    max-width: 1400px;
    margin: 0 auto;
    padding: 80px 48px;
    display: grid;
    grid-template-columns: repeat(2, 1fr);
    gap: 0;
    border-bottom: 1px solid var(--grey-5);
}
.visit-block {
    padding: 48px 48px 48px 0;
    border-right: 1px solid var(--grey-5);
}
.visit-block:nth-child(even) {
    padding: 48px 0 48px 48px;
    border-right: none;
}
.visit-block:nth-child(3),
.visit-block:nth-child(4) { border-top: 1px solid var(--grey-5); }
.visit-block h2 {
    font-family: var(--sans);
    font-size: 1.4rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 28px;
}
.visit-block h2 em {
    display: block;
    font-style: normal;
    font-size: 0.72em;
    color: var(--grey-4);
    letter-spacing: 2px;
    margin-top: 2px;
    font-weight: 300;
}
.visit-rows { display: flex; flex-direction: column; gap: 16px; }
.visit-row {
    display: flex;
    gap: 24px;
    font-size: 0.9rem;
    padding-bottom: 16px;
    border-bottom: 1px solid var(--grey-6);
}
.visit-row:last-child { border-bottom: none; }
.vr-label {
    min-width: 90px;
    font-size: 0.75rem;
    letter-spacing: 1.5px;
    color: var(--grey-4);
    padding-top: 2px;
}
.vr-muted { color: var(--grey-4); }
.visit-row a { border-bottom: 1px solid var(--grey-5); transition: border-color 0.3s; }
.visit-row a:hover { border-color: var(--black); }

.visit-space-section {
    background: var(--grey-6);
    padding: 80px 48px;
    border-top: 1px solid var(--grey-5);
}
.visit-space-text { max-width: 700px; margin: 0 auto; text-align: center; }
.space-tag {
    font-size: 0.68rem;
    letter-spacing: 4px;
    color: var(--grey-4);
    margin-bottom: 20px;
    text-transform: uppercase;
}
.visit-space-text h3 {
    font-family: var(--sans);
    font-size: 2.2rem;
    font-weight: 700;
    letter-spacing: 1px;
    margin-bottom: 24px;
}
.visit-space-text p {
    font-size: 0.9rem;
    color: var(--grey-3);
    line-height: 2;
    margin-bottom: 36px;
}
.space-cta {
    display: inline-block;
    padding: 14px 40px;
    background: var(--black);
    color: var(--white);
    font-size: 0.75rem;
    letter-spacing: 3px;
    transition: opacity 0.3s;
}
.space-cta:hover { opacity: 0.65; }

/* ── FOOTER ──────────────────────────────────────────────── */
.footer {
    background: var(--black);
    padding: 64px 48px 40px;
}
.footer-inner { max-width: 1400px; margin: 0 auto; }
.footer-brand {
    font-family: var(--logo);
    font-size: 1.6rem;
    font-weight: 900;
    letter-spacing: 6px;
    color: var(--white);
    margin-bottom: 48px;
    padding-bottom: 32px;
    border-bottom: 1px solid rgba(255,255,255,0.1);
}
.footer-cols {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 40px;
    margin-bottom: 48px;
}
.footer-col-title {
    font-size: 0.68rem;
    letter-spacing: 2.5px;
    color: var(--grey-4);
    margin-bottom: 12px;
    text-transform: uppercase;
}
.footer-col p { font-size: 0.85rem; color: var(--grey-3); line-height: 1.8; }
.footer-col a { border-bottom: 1px solid var(--grey-2); transition: border-color 0.3s; }
.footer-col a:hover { border-color: var(--grey-4); }
.footer-muted { color: var(--grey-2) !important; }
.footer-bottom {
    border-top: 1px solid rgba(255,255,255,0.06);
    padding-top: 24px;
    font-size: 0.72rem;
    color: var(--grey-2);
    letter-spacing: 1px;
}

/* ── ANIMATIONS ──────────────────────────────────────────── */
.fade-in {
    opacity: 0;
    transform: translateY(24px);
    transition: opacity 0.8s ease, transform 0.8s ease;
}
.fade-in.visible { opacity: 1; transform: translateY(0); }

/* ── RESPONSIVE ──────────────────────────────────────────── */
@media (max-width: 1024px) {
    .exhibition-grid { grid-template-columns: 1fr; }
    .visit-info-grid { grid-template-columns: 1fr; }
    .visit-block { border-right: none !important; padding: 40px 0 !important; border-top: 1px solid var(--grey-5) !important; }
    .visit-block:first-child { border-top: none !important; }
    .ex-item-inner { grid-template-columns: 280px 1fr; gap: 32px; }
    .footer-cols { grid-template-columns: 1fr 1fr; }
}

@media (max-width: 768px) {
    :root { --header-h: 60px; }
    .header { padding: 0 24px; }
    .header-nav { display: none; }
    .hero { padding: 0 24px 64px; }
    .about-strip { padding: 56px 24px; }
    .about-strip-inner { flex-direction: column; gap: 32px; }
    .section-exhibitions, .ex-list { padding: 0 24px 80px; }
    .page-hero { padding: 48px 24px 32px; }
    .filter-tabs { padding: 0 24px; }
    .ex-item-inner { grid-template-columns: 1fr; }
    .ex-meta { flex-direction: column; align-items: flex-start; gap: 16px; }
    .visit-info-grid { padding: 48px 24px; }
    .visit-space-section { padding: 56px 24px; }
    .footer { padding: 48px 24px 32px; }
    .footer-cols { grid-template-columns: 1fr; }
    .event-strip { padding: 48px 24px; }
    .event-strip-inner { flex-direction: column; gap: 28px; }
    .menu-overlay { padding: 40px 32px; }
}