:root {
  --ink: #15212d;
  --paper: #fbf8f1;
  --paper-soft: #f3eee2;
  --rust: #2d5876;
  --warm: #b8782f;
  --rule: rgba(21, 33, 45, 0.10);
  --max: 1180px;
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--paper);
  color: var(--ink);
  font: 16px/1.55 "Spectral", Georgia, "Times New Roman", serif;
}
img { max-width: 100%; display: block; }
a { color: var(--rust); text-decoration: none; }
a:hover { text-decoration: underline; }
.muted { color: #6b7785; font-size: 0.92rem; }

.topbar {
  display: flex; align-items: baseline; gap: 24px;
  padding: 14px 24px;
  border-bottom: 1px solid var(--rule);
  background: var(--paper);
}
.topbar .brand {
  font-weight: 700; letter-spacing: 0.04em;
  font-size: 1.1rem; color: var(--ink);
}
.topbar nav { margin-left: auto; display: flex; gap: 18px; }
.topbar nav a { color: #485560; }

.hero {
  max-width: var(--max);
  margin: 48px auto 24px;
  padding: 0 24px;
  text-align: center;
}
.hero h1 {
  font-size: clamp(2rem, 4vw, 3rem);
  letter-spacing: 0.02em;
  margin: 0 0 8px;
}
.hero p { font-size: 1.1rem; }

.catalogue {
  max-width: var(--max);
  margin: 24px auto 64px;
  padding: 0 24px;
}
.filters {
  display: flex; align-items: baseline; gap: 14px;
  margin-bottom: 18px;
}
.filters select {
  font: inherit; font-size: 0.95rem;
  padding: 8px 12px;
  background: #fff;
  border: 1px solid var(--rule);
  border-radius: 4px;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 24px;
}
.card {
  display: flex; flex-direction: column;
  background: var(--paper-soft);
  border: 1px solid var(--rule);
  text-decoration: none; color: inherit;
  transition: transform 0.12s, border-color 0.12s, box-shadow 0.12s;
}
.card:hover {
  transform: translateY(-2px);
  border-color: var(--rust);
  box-shadow: 0 8px 20px rgba(21, 33, 45, 0.08);
  text-decoration: none;
}
.card img { aspect-ratio: 2 / 3; object-fit: cover; background: #fff; }
.card-body { padding: 10px 12px 14px; }
.card-title { font-weight: 700; letter-spacing: 0.02em; font-size: 1rem; }
.card-sub { color: #6b7785; font-size: 0.85rem; }

.footer {
  max-width: var(--max);
  margin: 0 auto;
  padding: 32px 24px 48px;
  border-top: 1px solid var(--rule);
}

/* Poster detail */
.poster-detail {
  display: grid;
  grid-template-columns: minmax(320px, 1fr) minmax(280px, 380px);
  gap: 40px;
  max-width: var(--max);
  margin: 32px auto;
  padding: 0 24px 64px;
}
@media (max-width: 800px) {
  .poster-detail { grid-template-columns: 1fr; }
}
.poster-detail .image img {
  width: 100%; aspect-ratio: 2 / 3; object-fit: contain;
  background: #fff;
  border: 1px solid var(--rule);
}
.poster-detail h1 {
  font-size: clamp(1.6rem, 3vw, 2.4rem);
  letter-spacing: 0.04em;
  margin: 0 0 4px;
}
.poster-detail .subtitle {
  color: #6b7785; letter-spacing: 0.06em; font-size: 1rem;
}
.size-picker { margin: 28px 0 14px; }
.size-picker label {
  display: flex; align-items: baseline; justify-content: space-between;
  gap: 10px;
  padding: 10px 12px;
  border: 1px solid var(--rule);
  border-radius: 4px;
  background: #fff;
  margin-bottom: 8px;
  cursor: pointer;
}
.size-picker label:has(input:checked) { border-color: var(--rust); border-width: 2px; padding: 9px 11px; }
.size-picker input { margin-right: 8px; }
.size-name { font-weight: 600; }
.size-price { color: var(--rust); font-weight: 600; }

button.buy {
  font: inherit; font-weight: 700; letter-spacing: 0.06em;
  width: 100%; padding: 14px;
  background: var(--rust); color: #fff;
  border: none; border-radius: 4px;
  cursor: pointer;
  text-transform: uppercase;
}
button.buy:hover:not(:disabled) { background: #1d3e57; }
button.buy:disabled { opacity: 0.5; cursor: wait; }

.attribution {
  margin-top: 32px;
  padding: 14px 16px;
  background: var(--paper-soft);
  border-radius: 4px;
  font-size: 0.85rem;
}
.attribution dt { font-weight: 600; color: #485560; margin-top: 6px; }
.attribution dd { margin: 0 0 4px; }

.prose {
  max-width: 720px;
  margin: 32px auto;
  padding: 0 24px;
  font-size: 1.05rem;
}
.prose h1 { font-size: 2rem; }