:root {
  color-scheme: light dark;
  --bg: #f5f4f0;
  --fg: #1a1a1a;
  --muted: #6b6b6b;
  --accent: #2f6feb;
  --card-bg: #ffffff;
  --border: #e2e0da;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #16161a;
    --fg: #f2f2f2;
    --muted: #a0a0a0;
    --accent: #6ea8fe;
    --card-bg: #1f1f24;
    --border: #2c2c33;
  }
}

* { box-sizing: border-box; }

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

.site-header {
  text-align: center;
  padding: 2rem 1rem 1rem;
}

.site-header h1 {
  margin: 0 0 0.25rem;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  line-height: 1.15;
}

.subtitle {
  margin: 0;
  color: var(--muted);
}

main {
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 1rem 3rem;
}

.mine-banner {
  background: var(--accent);
  color: #fff;
  padding: 0.75rem 1rem;
  border-radius: 10px;
  text-align: center;
  margin-bottom: 1rem;
}

.badge {
  background: rgba(255, 255, 255, 0.25);
  padding: 0.1rem 0.5rem;
  border-radius: 999px;
  font-weight: 600;
}

.tap-hint {
  text-align: center;
  color: var(--muted);
  margin: 0 0 1.25rem;
  font-size: 0.95rem;
}

.status {
  text-align: center;
  color: var(--muted);
  padding: 2rem 0;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 1rem;
}

.photo-card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  position: relative;
}

.photo-card.mine {
  outline: 3px solid var(--accent);
}

/* The thumbnail itself is a button that opens the full-screen viewer. */
.photo-open {
  padding: 0;
  border: 0;
  background: none;
  cursor: zoom-in;
  display: block;
  width: 100%;
}

.photo-card img {
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  display: block;
}

.photo-card .mine-tag {
  position: absolute;
  top: 0.5rem;
  right: 0.5rem;
  background: var(--accent);
  color: #fff;
  font-size: 0.75rem;
  font-weight: 600;
  padding: 0.2rem 0.55rem;
  border-radius: 999px;
  pointer-events: none;
}

.card-action {
  display: block;
  width: 100%;
  text-align: center;
  padding: 0.7rem;
  color: var(--accent);
  background: none;
  font: inherit;
  font-weight: 600;
  cursor: pointer;
  border: 0;
  border-top: 1px solid var(--border);
}

.card-action:hover {
  background: rgba(127, 127, 127, 0.1);
}

.site-footer {
  text-align: center;
  color: var(--muted);
  padding: 2rem 1rem;
  font-size: 0.9rem;
}

/* ---- full-screen photo viewer ---- */

.lb-open-body { overflow: hidden; }

.lightbox {
  position: fixed;
  inset: 0;
  z-index: 100;
  background: rgba(0, 0, 0, 0.94);
  display: grid;
  grid-template-rows: 1fr auto;
}

.lightbox[hidden] { display: none; }

.lb-figure {
  margin: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 0;
  padding: max(0.5rem, env(safe-area-inset-top)) 0.5rem 0.5rem;
}

.lb-figure img {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  border-radius: 6px;
  /* Long-press must stay available -- on iOS that's how you save to Photos. */
  -webkit-touch-callout: default;
  touch-action: manipulation;
}

.lb-btn {
  position: absolute;
  background: rgba(255, 255, 255, 0.14);
  color: #fff;
  border: 0;
  cursor: pointer;
  border-radius: 999px;
  line-height: 1;
  z-index: 2;
}

.lb-btn:hover { background: rgba(255, 255, 255, 0.26); }

.lb-close {
  top: max(0.75rem, env(safe-area-inset-top));
  right: 0.75rem;
  width: 2.75rem;
  height: 2.75rem;
  font-size: 1.9rem;
}

.lb-nav {
  top: 50%;
  transform: translateY(-50%);
  width: 3rem;
  height: 3rem;
  font-size: 2rem;
}

.lb-prev { left: 0.5rem; }
.lb-next { right: 0.5rem; }

.lb-bar {
  text-align: center;
  color: #fff;
  padding: 0.85rem 1rem calc(1rem + env(safe-area-inset-bottom));
  background: rgba(0, 0, 0, 0.55);
}

.lb-count {
  display: block;
  font-size: 0.85rem;
  opacity: 0.75;
  margin-bottom: 0.35rem;
}

.lb-hint {
  margin: 0 0 0.75rem;
  font-size: 1rem;
  font-weight: 600;
}

.lb-actions {
  display: flex;
  gap: 0.75rem;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
}

.lb-save {
  background: var(--accent);
  color: #fff;
  border: 0;
  border-radius: 999px;
  padding: 0.7rem 1.6rem;
  font: inherit;
  font-weight: 700;
  cursor: pointer;
}

.lb-save[disabled] { opacity: 0.6; cursor: default; }

.lb-open {
  color: #fff;
  opacity: 0.8;
  text-decoration: underline;
  font-size: 0.9rem;
  padding: 0.5rem;
}

@media (max-width: 480px) {
  .lb-nav { width: 2.5rem; height: 2.5rem; font-size: 1.6rem; }
  .lb-hint { font-size: 0.95rem; }
}