:root {
  --paper: #f3e8d8;
  --ink: #161210;
  --muted: #5d4f42;
  --line: #251e18;
  --card: #f8eddc;
  --accent: #0f5b8d;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "IBM Plex Sans", sans-serif;
  background: radial-gradient(circle at top left, #faf3e8, #f1dfca 60%, #e9d4bf);
}

.paper-bg {
  position: fixed;
  inset: 0;
  pointer-events: none;
  background-image: linear-gradient(rgba(0, 0, 0, 0.02) 1px, transparent 1px);
  background-size: 100% 26px;
}

.page-shell {
  position: relative;
  max-width: 1080px;
  margin: 0 auto;
  padding: 20px 16px 56px;
}

.masthead {
  text-align: center;
  border-top: 4px solid var(--line);
  border-bottom: 3px solid var(--line);
  padding: 12px 10px 16px;
}

.masthead h1 {
  margin: 8px 0;
  font-family: "Libre Baskerville", serif;
  font-size: clamp(2rem, 5vw, 3.8rem);
}

.masthead-sub {
  margin: 2px 0 6px;
  font-size: 1.28rem;
  color: var(--muted);
  letter-spacing: 0.02em;
}

.edition,
.stamp {
  margin: 0;
  color: var(--muted);
  font-size: 0.76rem;
  text-transform: uppercase;
  letter-spacing: 0.12em;
}

.top-links {
  margin-top: 16px;
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.top-card {
  display: block;
  text-decoration: none;
  color: var(--ink);
  background: var(--card);
  border: 1.5px solid var(--line);
  padding: 14px;
  min-height: 140px;
  transition: transform 160ms ease, box-shadow 160ms ease;
}

.top-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 8px 0 rgba(22, 18, 16, 0.14);
}

.top-card .label {
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--muted);
}

.top-card strong {
  display: block;
  margin-top: 7px;
  font-family: "Libre Baskerville", serif;
  font-size: 1.1rem;
}

.top-card p {
  margin: 10px 0 0;
  color: var(--muted);
  line-height: 1.45;
}

.top-card.disabled {
  opacity: 0.72;
  cursor: not-allowed;
}

main {
  margin-top: 18px;
  display: grid;
  gap: 14px;
}

.guide-block {
  background: var(--card);
  border: 1.5px solid var(--line);
  padding: 16px;
}

.guide-block h2,
.guide-block h3 {
  margin: 0 0 10px;
  font-family: "Libre Baskerville", serif;
}

.guide-block h2 {
  font-size: 1.25rem;
}

.guide-block h3 {
  font-size: 1rem;
  margin-top: 12px;
}

.guide-block p,
.guide-block li {
  margin: 0 0 10px;
  color: var(--muted);
}

.framework-block p {
  margin-bottom: 12px;
}

.framework-view {
  display: block;
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 520px;
  margin: 0 auto;
  border: 1.5px solid var(--line);
  background: #fff;
}

pre {
  margin: 0;
  overflow-x: auto;
  background: #1d1814;
  color: #f9f6f0;
  border: 1px solid #090705;
  padding: 11px 12px;
  line-height: 1.45;
}

code {
  font-family: "SFMono-Regular", Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

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

@media (max-width: 980px) {
  .top-links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .top-links {
    grid-template-columns: 1fr;
  }
}