:root {
  --bg: #fafaf8;
  --fg: #222;
  --muted: #6b6b6b;
  --line: #ddd;
  --btn: #fff;
  --btn-hover: #eee;
  color-scheme: light dark;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #161616;
    --fg: #e8e8e8;
    --muted: #9a9a9a;
    --line: #333;
    --btn: #222;
    --btn-hover: #2e2e2e;
  }
}
* { box-sizing: border-box; }
body {
  margin: 0;
  padding: 0 16px;
  background: var(--bg);
  color: var(--fg);
  font: 16px/1.5 system-ui, -apple-system, "Segoe UI", sans-serif;
}
a { color: inherit; }
header, main, footer { max-width: 960px; margin: 0 auto; }
header { padding: 20px 0 8px; text-align: center; }
header h1 { margin: 0; font-size: 1.6rem; letter-spacing: .02em; }
header h1 a { text-decoration: none; }
header p { margin: 4px 0 0; color: var(--muted); }

.chapters {
  list-style: none;
  margin: 24px 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  gap: 24px;
}
.chapters a { display: block; text-decoration: none; text-align: center; }
.chapters img {
  width: 100%;
  aspect-ratio: 600 / 812;
  object-fit: cover;
  border: 1px solid var(--line);
  transition: transform .15s;
}
.chapters a:hover img, .chapters a:focus-visible img { transform: translateY(-3px); }
.chapters span { display: block; margin-top: 6px; }
.chapters small { color: var(--muted); }

nav.pager {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 8px;
  margin: 16px 0;
}
.btn {
  display: inline-block;
  padding: 6px 14px;
  border: 1px solid var(--line);
  border-radius: 6px;
  background: var(--btn);
  text-decoration: none;
  font-size: .95rem;
}
a.btn:hover, a.btn:focus-visible { background: var(--btn-hover); }
.btn.disabled { opacity: .35; }
.where { text-align: center; color: var(--muted); margin: 0; }
.page { text-align: center; padding-top: 16px; }
.page img { max-width: 100%; height: auto; border: 1px solid var(--line); }

footer {
  margin-top: 32px;
  padding: 16px 0 24px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: .9rem;
  text-align: center;
}
footer p { margin: 2px 0; }