:root {
  --bg: #121212;
  --bg-card: #1e1e1e;
  --text: #e0e0e0;
  --text-muted: #999;
  --accent: #64b5f6;
  --gap: 12px;
  --content-margin: 20%;
  --text-inset: 1rem;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
    Helvetica, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

header {
  text-align: left;
  padding: 2rem var(--content-margin) 1rem;
  padding-left: calc(var(--content-margin) + var(--text-inset));
}

header h1 {
  font-size: 1.8rem;
  font-weight: 700;
}

.tagline {
  color: var(--text-muted);
  margin-top: 0.25rem;
}

.about {
  padding: 0 var(--content-margin) 2rem;
  padding-left: calc(var(--content-margin) + var(--text-inset));
  text-align: left;
}

.app-link {
  display: inline-block;
  margin-top: 1rem;
  padding: 0.5rem 1.25rem;
  background: var(--accent);
  color: #000;
  text-decoration: none;
  border-radius: 4px;
  font-weight: 600;
}

.app-link:hover {
  opacity: 0.85;
}

.gallery {
  flex: 1;
  padding: 0 var(--content-margin) var(--gap);
}

#photo-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
  gap: var(--gap);
}

.card {
  background: var(--bg-card);
  border-radius: 6px;
  overflow: hidden;
}

.card img {
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  display: block;
}

.card .caption {
  padding: 0.5rem 0.6rem;
  font-size: 0.85rem;
}

.card .caption .username {
  font-weight: 600;
}

.card .caption .date {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.loading,
.error,
.end-message {
  text-align: center;
  padding: 2rem;
  color: var(--text-muted);
}

.error {
  color: #ef5350;
}

footer {
  display: flex;
  justify-content: space-between;
  padding: 2rem var(--content-margin);
  padding-left: calc(var(--content-margin) + var(--text-inset));
  color: var(--text-muted);
  font-size: 0.8rem;
}

footer a {
  color: var(--text-muted);
  text-decoration: none;
}

footer a:hover {
  color: var(--text);
}