:root {
  --bg: #f7f7f5;
  --fg: #1c1c1c;
  --muted: #6b6b6b;
  --card: #ffffff;
  --border: #e2e2e0;
  --accent: #0f9b8e;
  --badge-exact-bg: #e3f6f2;
  --badge-exact-fg: #0f6b60;
  --badge-estimated-bg: #fdf3e3;
  --badge-estimated-fg: #8a5a10;
  --badge-unknown-bg: #efefef;
  --badge-unknown-fg: #666666;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #14161a;
    --fg: #eaeaea;
    --muted: #9a9a9a;
    --card: #1d2025;
    --border: #2b2f36;
    --accent: #35c9b8;
    --badge-exact-bg: #10312d;
    --badge-exact-fg: #6fe4d2;
    --badge-estimated-bg: #332813;
    --badge-estimated-fg: #f0c069;
    --badge-unknown-bg: #23262b;
    --badge-unknown-fg: #b0b0b0;
  }
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  line-height: 1.5;
}

a { color: var(--accent); }

.site-header {
  padding: 2rem 1.5rem 1rem;
  text-align: center;
}
.site-title {
  font-size: 1.6rem;
  font-weight: 700;
  text-decoration: none;
  color: var(--fg);
}
.site-subtitle { color: var(--muted); margin: .25rem 0 0; }

main {
  max-width: 960px;
  margin: 0 auto;
  padding: 1rem 1.25rem 3rem;
}

.phase-heading {
  margin: 2.5rem 0 1rem;
  padding-bottom: .5rem;
  border-bottom: 1px solid var(--border);
  color: var(--muted);
  font-size: 1.1rem;
  text-transform: uppercase;
  letter-spacing: .04em;
}

.timeline { display: flex; flex-direction: column; gap: .75rem; }

.chapters {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
  gap: 1.25rem;
}
.chapter-card {
  display: flex;
  flex-direction: column;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  overflow: hidden;
  text-decoration: none;
  color: var(--fg);
}
.chapter-thumb {
  width: 100%;
  height: 180px;
  object-fit: cover;
  background: var(--border);
  display: block;
}
.chapter-body { padding: 1rem 1.1rem 1.2rem; }
.chapter-body h2 { margin: 0 0 .5rem; font-size: 1.15rem; }
.chapter-intro {
  margin: 0 0 .6rem;
  color: var(--muted);
  font-size: .92rem;
  line-height: 1.45;
}

.timeline-card {
  display: flex;
  gap: 1rem;
  align-items: center;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: .75rem;
  text-decoration: none;
  color: var(--fg);
}
.timeline-thumb {
  width: 120px;
  height: 90px;
  object-fit: cover;
  border-radius: 8px;
  flex: none;
  background: var(--border);
}
.timeline-card-body h3 { margin: .35rem 0; font-size: 1.05rem; }

.badge {
  display: inline-block;
  font-size: .75rem;
  padding: .15rem .55rem;
  border-radius: 999px;
  font-weight: 600;
}
.badge-exact { background: var(--badge-exact-bg); color: var(--badge-exact-fg); }
.badge-estimated { background: var(--badge-estimated-bg); color: var(--badge-estimated-fg); }
.badge-unknown { background: var(--badge-unknown-bg); color: var(--badge-unknown-fg); }

.stage-tag {
  margin-left: .5rem;
  font-size: .75rem;
  color: var(--muted);
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: .15rem .55rem;
}

.photo-count {
  display: block;
  color: var(--muted);
  font-size: .8rem;
  margin-top: .25rem;
}

.back-link { display: inline-block; margin-bottom: 1rem; text-decoration: none; }

.entry h1 { margin-bottom: .5rem; }
.entry-meta { margin-bottom: 1.5rem; }
.entry-content { margin-bottom: 1.5rem; color: var(--fg); }

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: .6rem;
}
.gallery-item img {
  width: 100%;
  height: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: 8px;
  display: block;
  background: var(--border);
}

.video-list { margin-top: 1.5rem; display: flex; flex-direction: column; gap: 1rem; }
.video-list video { width: 100%; border-radius: 8px; background: #000; }

.lightbox {
  display: none;
  position: fixed;
  inset: 0;
  background: rgba(0, 0, 0, 0.92);
  z-index: 1000;
  align-items: center;
  justify-content: center;
}
.lightbox.open { display: flex; }
.lightbox-img {
  max-width: 90vw;
  max-height: 90vh;
  object-fit: contain;
  border-radius: 4px;
}
.lightbox-close, .lightbox-prev, .lightbox-next {
  position: absolute;
  background: rgba(255, 255, 255, 0.08);
  color: #fff;
  border: none;
  cursor: pointer;
  border-radius: 999px;
  line-height: 1;
}
.lightbox-close {
  top: 1.2rem;
  right: 1.2rem;
  width: 2.5rem;
  height: 2.5rem;
  font-size: 1.6rem;
}
.lightbox-prev, .lightbox-next {
  top: 50%;
  transform: translateY(-50%);
  width: 3rem;
  height: 3rem;
  font-size: 2rem;
}
.lightbox-prev { left: 1rem; }
.lightbox-next { right: 1rem; }
.lightbox-close:hover, .lightbox-prev:hover, .lightbox-next:hover {
  background: rgba(255, 255, 255, 0.18);
}
.lightbox-count {
  position: absolute;
  bottom: 1.2rem;
  left: 50%;
  transform: translateX(-50%);
  color: rgba(255, 255, 255, 0.7);
  font-size: .85rem;
}

.site-footer {
  text-align: center;
  color: var(--muted);
  font-size: .8rem;
  padding: 2rem 0;
}