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

:root {
  --bg: #0c0c0c;
  --bg2: #111111;
  --surface: #181818;
  --border: rgba(255,255,255,0.07);
  --text: #f0f0f0;
  --text-dim: #888;
  --text-muted: #555;
  --accent: #e8e8e8;
  --accent-hover: #ffffff;
  --dot: #c8a96e;

  --font: 'Pretendard Variable', 'Pretendard', -apple-system, BlinkMacSystemFont, sans-serif;

  --gap: clamp(8px, 1.2vw, 16px);
  --col: clamp(240px, 30vw, 420px);
  --radius: 4px;
  --trans: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

html { scroll-behavior: smooth; }

body {
  font-family: var(--font);
  background: var(--bg);
  color: var(--text);
  min-height: 100vh;
  overflow-x: hidden;
  -webkit-font-smoothing: antialiased;
}

img { display: block; max-width: 100%; }
button { cursor: pointer; border: none; background: none; color: inherit; font-family: inherit; }
a { text-decoration: none; color: inherit; }

/* ============================================================
   Header / Nav
   ============================================================ */
.site-header {
  position: fixed;
  top: 0; left: 0; right: 0;
  z-index: 100;
  padding: 0 clamp(20px, 5vw, 60px);
  height: 64px;
  display: flex;
  align-items: center;
  background: linear-gradient(to bottom, rgba(12,12,12,0.95) 0%, rgba(12,12,12,0) 100%);
  backdrop-filter: blur(0px);
  transition: background var(--trans), backdrop-filter var(--trans);
}

.site-header.scrolled {
  background: rgba(12,12,12,0.92);
  backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border);
}

.nav {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-logo {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}
.nav-logo .dot { color: var(--dot); }

.nav-filters {
  display: flex;
  gap: 4px;
  flex: 1;
}

.filter-btn {
  padding: 6px 14px;
  font-size: 13px;
  font-weight: 500;
  letter-spacing: 0.02em;
  color: var(--text-muted);
  border-radius: 20px;
  transition: color var(--trans), background var(--trans);
}

.filter-btn:hover {
  color: var(--text-dim);
  background: rgba(255,255,255,0.05);
}

.filter-btn.active {
  color: var(--text);
  background: rgba(255,255,255,0.1);
}

.nav-right {
  white-space: nowrap;
}

.photo-count {
  font-size: 12px;
  font-weight: 400;
  color: var(--text-muted);
  letter-spacing: 0.05em;
}

/* ============================================================
   Hero
   ============================================================ */
.hero {
  height: 100vh;
  min-height: 560px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 0 clamp(24px, 8vw, 120px);
  position: relative;
  overflow: hidden;
}

/* 배경 사진 */
.hero-bg {
  position: absolute;
  inset: -6%;          /* Ken Burns 여백 */
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  animation: kenBurns 18s ease-in-out infinite alternate;
  will-change: transform;
}

@keyframes kenBurns {
  0%   { transform: scale(1)    translate(0,    0);    }
  100% { transform: scale(1.08) translate(-1.5%, 1%); }
}

/* 오버레이: 아래로 갈수록 배경색과 자연스럽게 연결 */
.hero-overlay {
  position: absolute;
  inset: 0;
  background:
    linear-gradient(to bottom, rgba(0,0,0,0.35) 0%, rgba(0,0,0,0.55) 60%, var(--bg) 100%);
  pointer-events: none;
}


.hero-sub {
  position: absolute;
  top: clamp(28px, 4vw, 48px);
  left: clamp(24px, 8vw, 120px);
  z-index: 1;
  font-size: clamp(11px, 1.2vw, 13px);
  font-weight: 400;
  color: rgba(255,255,255,0.5);
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scroll-hint {
  position: absolute;
  bottom: 48px;
  left: clamp(24px, 8vw, 120px);
  display: flex;
  align-items: center;
  gap: 16px;
  z-index: 1;
  color: rgba(255,255,255,0.4);
  font-size: 11px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.scroll-line {
  width: 40px;
  height: 1px;
  background: var(--text-muted);
  transform-origin: left;
  animation: scrollPulse 2s ease-in-out infinite;
}

@keyframes scrollPulse {
  0%, 100% { transform: scaleX(1); opacity: 0.4; }
  50% { transform: scaleX(1.4); opacity: 1; }
}

/* ============================================================
   Gallery
   ============================================================ */
.gallery-wrap {
  padding: 0 clamp(16px, 3vw, 40px) 80px;
}

.gallery {
  columns: var(--col) auto;
  column-gap: var(--gap);
}

.gallery-item {
  break-inside: avoid;
  margin-bottom: var(--gap);
  position: relative;
  overflow: hidden;
  border-radius: var(--radius);
  background: var(--surface);
  cursor: pointer;
  opacity: 0;
  transform: translateY(20px);
  transition: opacity 0.5s ease, transform 0.5s ease;
}

.gallery-item.visible {
  opacity: 1;
  transform: translateY(0);
}

.gallery-item.hidden {
  display: none;
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.6s cubic-bezier(0.4, 0, 0.2, 1);
  will-change: transform;
}

.gallery-item:hover img {
  transform: scale(1.04);
}

.gallery-item-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(to top, rgba(0,0,0,0.7) 0%, transparent 50%);
  opacity: 0;
  transition: opacity var(--trans);
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  padding: 20px 16px 16px;
  pointer-events: none;
}

.gallery-item:hover .gallery-item-overlay {
  opacity: 1;
}

.item-title {
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.01em;
  color: #fff;
  line-height: 1.3;
}

.item-meta {
  margin-top: 4px;
  font-size: 11px;
  font-weight: 400;
  color: rgba(255,255,255,0.6);
  letter-spacing: 0.04em;
}

/* Skeleton loader */
.gallery-item.skeleton {
  aspect-ratio: 4/3;
  cursor: default;
}
.gallery-item.skeleton::after {
  content: '';
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, var(--surface) 0%, rgba(255,255,255,0.05) 50%, var(--surface) 100%);
  background-size: 200% 100%;
  animation: shimmer 1.5s infinite;
}
@keyframes shimmer {
  0% { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}

/* ============================================================
   Lightbox
   ============================================================ */
.lb-backdrop {
  position: fixed;
  inset: 0;
  background: rgba(0,0,0,0.96);
  z-index: 200;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 201;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity 0.3s ease;
}

.lb-backdrop.open,
.lightbox.open {
  opacity: 1;
  pointer-events: all;
}

.lb-img-wrap {
  position: relative;
  max-width: min(90vw, 1200px);
  max-height: 80vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.lb-img {
  max-width: min(90vw, 1200px);
  max-height: 80vh;
  width: auto;
  height: auto;
  object-fit: contain;
  border-radius: 2px;
  opacity: 0;
  transition: opacity 0.25s ease;
  user-select: none;
}

.lb-img.loaded { opacity: 1; }

.lb-spinner {
  position: absolute;
  width: 28px;
  height: 28px;
  border: 2px solid rgba(255,255,255,0.1);
  border-top-color: var(--dot);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}
.lb-spinner.hidden { display: none; }
@keyframes spin { to { transform: rotate(360deg); } }

/* ── Color Palette ─────────────────────────────────────────── */
.lb-palette {
  position: fixed;
  right: clamp(24px, 5vw, 60px);
  top: 50%;
  transform: translateY(-50%);
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: center;
  opacity: 0;
  transition: opacity 0.15s ease;
  pointer-events: none;
}

.lb-palette.ready {
  opacity: 1;
  pointer-events: all;
}

.palette-swatch {
  display: flex;
  align-items: center;
  cursor: pointer;
  position: relative;
}

.palette-swatch-color {
  width: 32px;
  height: 32px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.12);
  transition: transform 0.25s cubic-bezier(0.34, 1.56, 0.64, 1),
              border-color 0.2s ease,
              box-shadow 0.2s ease;
  flex-shrink: 0;
}

.palette-swatch:hover .palette-swatch-color {
  transform: scale(1.3) translateX(-3px);
  border-color: rgba(255,255,255,0.35);
  box-shadow: 0 4px 16px rgba(0,0,0,0.5);
}

.palette-swatch-hex {
  position: absolute;
  right: calc(100% + 10px);
  top: 50%;
  transform: translateY(-50%) translateX(4px);
  font-size: 10px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--text-dim);
  text-transform: uppercase;
  font-variant-numeric: tabular-nums;
  opacity: 0;
  transition: opacity 0.2s ease, transform 0.2s ease;
  white-space: nowrap;
  user-select: none;
  pointer-events: none;
}

.palette-swatch:hover .palette-swatch-hex {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}

/* 복사 완료 피드백 */
.palette-swatch-color.copied {
  animation: swatchPop 0.35s ease;
}
@keyframes swatchPop {
  0%   { transform: scale(1); }
  40%  { transform: scale(1.3); }
  100% { transform: scale(1); }
}

/* 팔레트 로딩 스켈레톤 */
.palette-swatch-color.loading {
  background: rgba(255,255,255,0.06) !important;
  animation: palettePulse 1.2s ease-in-out infinite;
}
@keyframes palettePulse {
  0%, 100% { opacity: 0.4; }
  50%       { opacity: 0.8; }
}

/* 이미지에서 팔레트로 날아오는 원점 도트 — transform/transition은 JS로 제어 */
.color-origin-dot {
  position: fixed;
  width: 42px;
  height: 42px;
  border-radius: 50%;
  border: 1.5px solid rgba(255,255,255,0.4);
  pointer-events: none;
  z-index: 203;
}

/* 선택된 스워치 활성 상태 */
.palette-swatch.active .palette-swatch-color {
  transform: scale(1.3) translateX(-3px);
  border-color: rgba(255,255,255,0.45);
  box-shadow: 0 0 0 2px rgba(255,255,255,0.18), 0 6px 24px rgba(0,0,0,0.65);
}
.palette-swatch.active .palette-swatch-hex {
  opacity: 1;
  transform: translateY(-50%) translateX(0);
}


/* ── Meta bar ─────────────────────────────────────────────── */
.lb-meta {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 20px clamp(24px, 5vw, 60px);
  display: flex;
  align-items: center;
  gap: 16px;
  background: linear-gradient(to top, rgba(0,0,0,0.85) 0%, transparent 100%);
}

.lb-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  letter-spacing: 0.01em;
}

.lb-info {
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.03em;
}

.lb-counter {
  margin-left: auto;
  font-size: 12px;
  color: var(--text-muted);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.05em;
}

.lb-close {
  position: fixed;
  top: 20px;
  right: 20px;
  width: 44px;
  height: 44px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-dim);
  border-radius: 50%;
  transition: color var(--trans), background var(--trans);
}
.lb-close:hover {
  color: var(--text);
  background: rgba(255,255,255,0.08);
}


/* ============================================================
   Footer
   ============================================================ */
.site-footer {
  padding: 32px clamp(24px, 5vw, 60px);
  border-top: 1px solid var(--border);
  text-align: center;
  font-size: 12px;
  color: var(--text-muted);
  letter-spacing: 0.04em;
}

.footer-link {
  color: var(--text-dim);
  text-decoration: none;
  transition: color var(--trans);
}
.footer-link:hover { color: var(--text); }

/* ============================================================
   Responsive
   ============================================================ */
@media (max-width: 640px) {
  .nav-filters { display: none; }
  .mobile-filters {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    padding: 12px clamp(16px, 4vw, 24px);
    scrollbar-width: none;
    -webkit-overflow-scrolling: touch;
  }
  .mobile-filters::-webkit-scrollbar { display: none; }
}

/* ============================================================
   Utility
   ============================================================ */
::selection { background: var(--dot); color: #000; }

@media (prefers-reduced-motion: reduce) {
  *, *::before, *::after { animation-duration: 0.01ms !important; transition-duration: 0.01ms !important; }
}