:root {
  --bg: #fbf7ee;
  --panel: #ffffff;
  --fg: #2b2620;
  --muted: #6f6a60;
  --border: #e6ddc9;
  --gold: #b8892f;
  --gold-soft: #f0e2b8;
  --code-bg: #f2ecdc;
  --serif: "Iowan Old Style", "Palatino", "Georgia", ui-serif, serif;
  --sans: -apple-system, BlinkMacSystemFont, "Inter", "Segoe UI", Roboto, sans-serif;
  --mono: ui-monospace, SFMono-Regular, "SF Mono", Menlo, monospace;
}
@media (prefers-color-scheme: dark) {
  :root {
    --bg: #17140f;
    --panel: #1e1a13;
    --fg: #f2ead8;
    --muted: #9c948a;
    --border: #33291b;
    --gold: #d4af37;
    --gold-soft: rgba(212, 175, 55, 0.15);
    --code-bg: #23200c;
  }
}
* { box-sizing: border-box; }
html, body {
  margin: 0; padding: 0;
  background: var(--bg); color: var(--fg);
  font-family: var(--sans);
  font-size: 16px; line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}
.wrap {
  max-width: 780px; margin: 0 auto;
  padding: 2rem 1.5rem 4rem;
}
.back {
  display: inline-block;
  color: var(--muted); font-size: 0.9rem;
  text-decoration: none; margin-bottom: 1.5rem;
  border-bottom: 1px dotted var(--border);
}
.back:hover { color: var(--gold); border-color: var(--gold); }
.spec-content h1 {
  font-family: var(--serif); font-weight: 400;
  font-size: clamp(1.9rem, 4vw, 2.4rem);
  letter-spacing: -0.01em;
  line-height: 1.15;
  margin: 0 0 1.5rem;
  padding-bottom: 0.9rem;
  border-bottom: 1px solid var(--border);
}
.spec-content h2 {
  font-family: var(--serif); font-weight: 400;
  font-size: 1.55rem; letter-spacing: -0.005em;
  margin: 3rem 0 0.9rem;
}
.spec-content h3 {
  font-weight: 600; font-size: 1.15rem;
  margin: 2rem 0 0.6rem;
}
.spec-content h4 {
  font-weight: 600; font-size: 1rem;
  margin: 1.4rem 0 0.5rem;
  color: var(--muted);
}
.spec-content p { margin: 0 0 1rem; }
.spec-content ul, .spec-content ol { margin: 0 0 1rem; padding-left: 1.5rem; }
.spec-content li { margin: 0.2rem 0; }
.spec-content a { color: var(--gold); text-decoration: underline; text-underline-offset: 3px; text-decoration-thickness: 1px; }
.spec-content a:hover { color: var(--fg); }
.spec-content strong { font-weight: 600; color: var(--fg); }
.spec-content em { font-style: italic; }
.spec-content code {
  background: var(--code-bg);
  padding: 0.1rem 0.35rem;
  border-radius: 4px;
  font-family: var(--mono);
  font-size: 0.9em;
}
.spec-content pre {
  background: var(--code-bg);
  border: 1px solid var(--border);
  border-radius: 8px;
  padding: 0.9rem 1rem;
  overflow-x: auto;
  font-family: var(--mono);
  font-size: 0.85rem;
  line-height: 1.5;
  margin: 0.5rem 0 1.3rem;
}
.spec-content pre code {
  background: transparent; padding: 0; font-size: inherit;
}
.spec-content blockquote {
  margin: 0 0 1rem;
  padding: 0.6rem 1rem;
  border-left: 3px solid var(--gold);
  background: var(--gold-soft);
  color: var(--fg);
  border-radius: 0 6px 6px 0;
}
.spec-content blockquote p:last-child { margin-bottom: 0; }
.spec-content hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 2.5rem 0;
}
.spec-content table {
  border-collapse: collapse;
  margin: 0 0 1.2rem;
  width: 100%;
}
.spec-content th, .spec-content td {
  border: 1px solid var(--border);
  padding: 0.4rem 0.7rem;
  text-align: left;
  font-size: 0.92rem;
}
.spec-content th { background: var(--panel); font-weight: 600; }
.loading, .error {
  color: var(--muted);
  font-style: italic;
  padding: 2rem 0;
  text-align: center;
}
.error { color: var(--danger, #8a3a2b); font-style: normal; }
footer {
  margin-top: 4rem; padding-top: 2rem;
  border-top: 1px solid var(--border);
  color: var(--muted); font-size: 0.88rem;
  display: flex; justify-content: space-between;
  flex-wrap: wrap; gap: 0.8rem;
}
footer a { color: var(--muted); border-bottom: 1px dotted var(--border); text-decoration: none; }
footer a:hover { color: var(--gold); border-color: var(--gold); }
@media (max-width: 480px) {
  .wrap { padding: 1.5rem 1.1rem 3rem; }
  .spec-content pre { font-size: 0.78rem; }
}