:root {
  --bg: #faf9f5;
  --surface: #ffffff;
  --surface-soft: #f4f1e8;
  --text: #141413;
  --muted: #6f6b63;
  --border: #e8e6dc;
  --accent: #d97757;
  --accent-2: #6a9bcc;
  --accent-3: #788c5d;
  --shadow: 0 8px 30px rgba(20, 20, 19, 0.05);
}
* { box-sizing: border-box; }
html { scroll-behavior: smooth; }
body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.7;
}
a { color: var(--text); text-decoration: none; }
a:hover { color: var(--accent); }
code {
  background: var(--surface-soft);
  border: 1px solid var(--border);
  padding: 0.12rem 0.38rem;
  border-radius: 6px;
  font-size: 0.92em;
}
.topbar {
  position: sticky;
  top: 0;
  z-index: 20;
  display: flex;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 20px;
  background: rgba(250, 249, 245, 0.92);
  border-bottom: 1px solid var(--border);
  backdrop-filter: blur(10px);
}
.brand {
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--muted);
  font-weight: 600;
}
.wrap,
.page,
.toc,
.footer { max-width: 1040px; margin: 0 auto; }
.hero {
  padding: 72px 20px 28px;
}
.hero-panel {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 24px;
  padding: clamp(24px, 4vw, 42px);
  box-shadow: var(--shadow);
}
.hero h1,
h1,
h2,
h3,
h4 {
  font-family: Poppins, Arial, sans-serif;
  letter-spacing: -0.02em;
}
.hero h1 {
  font-size: clamp(2.4rem, 6vw, 4.8rem);
  line-height: 1.03;
  margin: 0 0 16px;
}
.hero p {
  max-width: 800px;
  font-size: 1.06rem;
  color: var(--muted);
}
.meta { color: var(--muted); font-size: 0.96rem; }
.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}
.pill {
  border: 1px solid var(--border);
  border-radius: 999px;
  padding: 6px 12px;
  font-size: 0.92rem;
  color: var(--muted);
  background: var(--surface-soft);
}
.toc {
  padding: 8px 20px 20px;
}
.toc-card,
.card,
.slide-inner,
.mini,
.diagram,
.note {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 22px;
  box-shadow: var(--shadow);
}
.toc-card { padding: 24px; }
.toc h2 { margin-top: 0; font-size: 1.5rem; }
.toc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px 18px;
}
.toc-grid a {
  color: var(--muted);
  border-bottom: 1px solid transparent;
}
.toc-grid a:hover { color: var(--accent); border-color: var(--accent); }
.slides {
  padding: 20px;
  display: grid;
  gap: 20px;
}
.slide {
  display: flex;
  align-items: stretch;
  justify-content: center;
}
.slide-inner {
  width: min(1100px, 100%);
  border-left: 6px solid var(--accent);
  padding: clamp(22px, 4vw, 42px);
}
.eyebrow {
  color: var(--accent);
  letter-spacing: 0.1em;
  text-transform: uppercase;
  font-size: 0.8rem;
  font-weight: 700;
  margin-bottom: 10px;
}
h2 {
  margin: 0 0 16px;
  font-size: clamp(1.8rem, 3.6vw, 3rem);
  line-height: 1.1;
}
h3 {
  margin: 22px 0 10px;
  font-size: 1.1rem;
}
.content { font-size: 1.03rem; }
.content p { margin: 0 0 14px; }
.content ul, .content ol { margin: 0 0 14px 0; padding-left: 1.35em; }
.content li { margin: 0 0 10px; }
.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 18px;
}
.mini { padding: 18px; }
.callout {
  border-left: 3px solid var(--accent-2);
  padding-left: 14px;
  margin: 18px 0;
  color: var(--muted);
}
.diagram {
  padding: 20px;
  overflow-x: auto;
  margin-top: 18px;
}
.diagram svg {
  width: 100%;
  min-width: 760px;
  height: auto;
}
.link-list a {
  display: inline-block;
  margin: 0 10px 10px 0;
  padding: 10px 12px;
  border: 1px solid var(--border);
  border-radius: 12px;
  background: var(--surface-soft);
  color: var(--text);
}
.link-list a:hover {
  border-color: var(--accent);
  color: var(--accent);
}
.footer {
  padding: 10px 20px 56px;
  color: var(--muted);
}
.footer a { color: var(--muted); }
.footer a:hover { color: var(--accent); }
@media (max-width: 720px) {
  .topbar { flex-direction: column; align-items: flex-start; }
  .hero { padding-top: 56px; }
  .slide-inner { border-radius: 18px; }
}