:root {
  --bg-color: #fcfbf9;
  --text-color: #1a1a1a;
  --rule-color: #d1d1d1;
  --accent: #d94a38;
  --focus-ring: rgba(0,0,0,0.8);
}

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

@media (prefers-reduced-motion: reduce) {
  * {
    animation: none !important;
    transform: none !important;
  }
}

body {
  background-color: var(--bg-color);
  color: var(--text-color);
  font-family: ui-serif, Georgia, Cambria, "Times New Roman", Times, serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  overflow-x: hidden;
}

main {
  max-width: 900px;
  margin: 0 auto;
  padding: 40px 20px;
}

h1, h2, h3 {
  font-family: ui-sans-serif, system-ui, -apple-system, sans-serif;
  font-weight: 600;
  margin-top: 2em;
  margin-bottom: 0.5em;
  color: var(--text-color);
}

h1 {
  font-size: 2rem;
  margin-top: 0;
  border-bottom: 2px solid var(--text-color);
  padding-bottom: 0.5em;
}

.row {
  display: flex;
  margin-bottom: 2rem;
  border-bottom: 1px solid var(--rule-color);
  padding-bottom: 2rem;
}

.row-number {
  flex: 0 0 40px;
  font-family: ui-monospace, monospace;
  font-size: 0.9em;
  color: var(--accent);
  padding-top: 0.25em;
}

.row-content {
  flex: 1;
  min-width: 0;
}

a {
  color: var(--accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
}

a:hover {
  text-decoration-thickness: 2px;
}

a:focus, button:focus {
  outline: 2px solid var(--focus-ring);
  outline-offset: 4px;
}

pre {
  background-color: #f0f0f0;
  padding: 16px;
  overflow-x: auto;
  font-size: 0.9em;
  border-top: 1px solid var(--rule-color);
  border-bottom: 1px solid var(--rule-color);
  white-space: pre-wrap;
  word-wrap: break-word;
}

code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, monospace;
  font-size: 0.9em;
}

.action-btn {
  display: inline-block;
  padding: 12px 24px;
  background-color: var(--text-color);
  color: var(--bg-color);
  text-decoration: none;
  font-family: ui-sans-serif, sans-serif;
  font-weight: bold;
  border-radius: 4px;
  min-width: 40px;
  min-height: 40px;
  text-align: center;
}

.action-btn:hover {
  transform: translateY(-2px);
  text-decoration: none;
}

img {
  max-width: 100%;
  height: auto;
  object-fit: contain;
  display: block;
  margin: 1rem 0;
}

figcaption {
  font-size: 0.85em;
  color: #666;
  text-align: center;
  margin-top: -0.5rem;
  margin-bottom: 1rem;
}

figure {
  margin: 1.5rem 0 2rem;
}

.irregular-divider {
  border: 0;
  height: 1px;
  background: var(--text-color);
  margin: 40px 0;
  width: 100%;
  max-width: 300px;
}

@media (max-width: 640px) {
  main {
    padding: 24px 16px 56px;
  }

  h1 {
    font-size: clamp(1.65rem, 9vw, 2.25rem);
    overflow-wrap: anywhere;
  }

  .row {
    display: grid;
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 8px;
  }

  .row-number {
    flex-basis: auto;
  }

  .action-btn {
    width: 100%;
    padding-inline: 12px;
  }
}