*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
:root {
  --bg: #F7F9FC; --blue: #5B9EC9; --blue-l: #B8D9EF;
  --blue-ll: #E4F3FB; --blue-d: #2A6FA0; --line: #DDE8F0;
  --ink: #1C2B38; --ink2: #4A6070; --ink3: #8AAABB; --ink4: #C0D4DF;
}
html { scroll-behavior: smooth; }
body {
  background: var(--bg); color: var(--ink);
  font-family: 'Noto Sans SC','Inter',sans-serif;
  -webkit-font-smoothing: antialiased;
}
body::before {
  content: ''; position: fixed; top: -200px; right: -150px;
  width: 600px; height: 600px;
  background: radial-gradient(ellipse, rgba(155,210,240,0.18) 0%, transparent 65%);
  pointer-events: none; z-index: 0;
}

/* ── nav ── */
nav {
  position: sticky; top: 0; z-index: 100;
  background: rgba(247,249,252,0.9);
  backdrop-filter: blur(16px); -webkit-backdrop-filter: blur(16px);
  border-bottom: 1px solid var(--line);
}
.nav-inner {
  max-width: 1000px; margin: 0 auto;
  padding: 0 2rem; height: 54px;
  display: flex; align-items: center; justify-content: space-between;
}
.nav-logo { display: flex; align-items: center; gap: 9px; text-decoration: none; }
.nav-dot { width: 7px; height: 7px; border-radius: 50%; background: linear-gradient(135deg, var(--blue), var(--blue-l)); }
.nav-name { font-size: 13px; font-weight: 500; letter-spacing: 0.14em; text-transform: uppercase; color: var(--ink); }
.nav-back {
  font-size: 10px; letter-spacing: 0.14em; text-transform: uppercase;
  color: var(--ink3); text-decoration: none;
  padding: 6px 12px; border-radius: 99px;
  transition: color .15s, background .15s;
}
.nav-back:hover { color: var(--ink); background: var(--blue-ll); }

/* ── page header ── */
.page { max-width: 1000px; margin: 0 auto; padding: 0 2rem 8rem; position: relative; z-index: 1; }
.page-header { padding-top: 6rem; padding-bottom: 3.5rem; }
.page-eyebrow {
  font-size: 10px; letter-spacing: 0.28em; text-transform: uppercase;
  color: var(--blue); display: flex; align-items: center; gap: 10px;
  margin-bottom: 2rem;
}
.page-eyebrow::before { content: ''; width: 14px; height: 1px; background: var(--blue); display: block; }
.page-title {
  font-family: 'Noto Serif SC', serif;
  font-size: clamp(2.2rem, 6vw, 3.4rem);
  font-weight: 300; color: var(--ink);
  line-height: 1.15; margin-bottom: 1rem;
}
.page-sub { font-size: 14px; color: var(--ink3); line-height: 1.8; max-width: 440px; }

/* ── masonry grid ── */
.masonry {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 10px;
}
.masonry-col { display: flex; flex-direction: column; gap: 10px; }

.photo-card {
  position: relative;
  border-radius: 10px;
  overflow: hidden;
  cursor: pointer;
  background: var(--blue-ll);
  border: 1px solid var(--line);
}
.photo-card img {
  width: 100%; display: block;
  transition: transform .35s ease;
}
.photo-card:hover img { transform: scale(1.04); }
.photo-card-overlay {
  position: absolute; inset: 0;
  background: linear-gradient(180deg, transparent 55%, rgba(28,43,56,0.55) 100%);
  opacity: 0; transition: opacity .25s;
  display: flex; align-items: flex-end; padding: 0.9rem 1rem;
}
.photo-card:hover .photo-card-overlay { opacity: 1; }
.photo-card-cap {
  color: #fff; font-size: 12px; letter-spacing: 0.03em;
  line-height: 1.5;
}
.photo-card-placeholder {
  aspect-ratio: 1; display: flex; align-items: center; justify-content: center;
  color: var(--ink4); font-size: 11px; letter-spacing: 0.08em;
}

/* ── empty state ── */
.empty { padding: 5rem 0; text-align: center; }
.empty p { font-size: 13px; color: var(--ink4); letter-spacing: 0.06em; }

/* ── lightbox ── */
.lightbox {
  position: fixed; inset: 0; z-index: 500;
  background: rgba(20,30,40,0);
  display: none;
  align-items: center; justify-content: center;
  padding: 2rem;
  backdrop-filter: blur(0px);
  transition: background .32s ease, backdrop-filter .32s ease;
}
.lightbox.open { display: flex; }
.lightbox.show {
  background: rgba(20,30,40,0.92);
  backdrop-filter: blur(6px);
}
.lightbox-inner {
  max-width: 1100px; max-height: 88vh;
  display: flex; flex-direction: column; align-items: center;
  gap: 1.2rem;
  opacity: 0;
  transition: opacity .28s ease;
  transition-delay: .05s;
}
.lightbox.show .lightbox-inner { opacity: 1; }
.lightbox-img-wrap {
  max-height: 76vh; display: flex; align-items: center; justify-content: center;
  position: relative;
}
.lightbox img {
  max-width: 100%; max-height: 76vh;
  border-radius: 8px;
  box-shadow: 0 20px 60px rgba(0,0,0,0.35);
  display: block;
}
/* the FLIP-animated clone that morphs from thumbnail to full image */
.lb-flip-img {
  position: fixed; z-index: 600;
  border-radius: 10px;
  object-fit: cover;
  box-shadow: 0 20px 60px rgba(0,0,0,0);
  pointer-events: none;
  transition: transform .42s cubic-bezier(.2,.8,.2,1), border-radius .42s ease, box-shadow .42s ease;
  will-change: transform;
}
.lightbox-cap {
  color: rgba(255,255,255,0.85);
  font-size: 13px; letter-spacing: 0.04em;
  text-align: center; max-width: 600px;
  line-height: 1.7;
}
.lightbox-meta {
  display: flex; align-items: center; gap: 10px;
  color: rgba(255,255,255,0.5);
  font-size: 11px; letter-spacing: 0.08em;
}
.lightbox-close {
  position: absolute; top: 1.5rem; right: 1.8rem;
  width: 38px; height: 38px; border-radius: 50%;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: #fff; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: background .15s;
}
.lightbox-close:hover { background: rgba(255,255,255,0.18); }
.lightbox-source {
  right: 5.2rem;
  text-decoration: none;
}
.lightbox-source svg { stroke: #fff; }
.lightbox-nav {
  position: absolute; top: 50%; transform: translateY(-50%);
  width: 44px; height: 44px; border-radius: 50%;
  background: rgba(255,255,255,0.08);
  border: 1px solid rgba(255,255,255,0.15);
  color: #fff; font-size: 18px;
  display: flex; align-items: center; justify-content: center;
  cursor: pointer; transition: background .15s;
}
.lightbox-nav:hover { background: rgba(255,255,255,0.18); }
.lightbox-prev { left: 1.5rem; }
.lightbox-next { right: 1.5rem; }

footer {
  margin-top: 5rem; padding-top: 2rem;
  border-top: 1px solid var(--line);
  display: flex; justify-content: space-between; align-items: center;
}
footer p { font-size: 10px; letter-spacing: 0.12em; text-transform: uppercase; color: var(--ink4); }

@media (max-width: 900px) {
  .masonry { grid-template-columns: repeat(3, 1fr); }
}
@media (max-width: 640px) {
  .nav-inner, .page { padding-left: 1.4rem; padding-right: 1.4rem; }
  .masonry { grid-template-columns: repeat(2, 1fr); gap: 8px; }
  .masonry-col { gap: 8px; }
  .page-header { padding-top: 4rem; }
  .lightbox-nav { width: 36px; height: 36px; font-size: 16px; }
  .lightbox-prev { left: 0.6rem; }
  .lightbox-next { right: 0.6rem; }
  .lightbox-close { top: 1rem; right: 1rem; }
  .lightbox-source { right: 4.2rem; }
}