:root {
  color-scheme: light;
  --bg: #f6f1e7;
  --paper: rgba(255, 252, 247, 0.96);
  --paper-strong: #fffdf9;
  --ink: #1f1b16;
  --muted: #665f57;
  --line: rgba(87, 72, 54, 0.16);
  --accent: #8c4f2b;
  --accent-soft: rgba(140, 79, 43, 0.12);
  --shadow: 0 28px 80px rgba(56, 38, 20, 0.12);
  --radius: 24px;
}

* {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  min-height: 100vh;
  color: var(--ink);
  background:
    radial-gradient(
      circle at top left,
      rgba(191, 147, 107, 0.34),
      transparent 34%
    ),
    radial-gradient(
      circle at top right,
      rgba(117, 143, 119, 0.18),
      transparent 26%
    ),
    linear-gradient(180deg, #f8f4ea 0%, #efe7d8 100%);
  font-family:
    "Iowan Old Style", "Palatino Linotype", "Book Antiqua", Palatino, Georgia,
    serif;
  line-height: 1.7;
}

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

.shell {
  width: min(100%, 1040px);
  margin: 0 auto;
  padding: 40px 20px 64px;
}

.hero {
  position: relative;
  overflow: hidden;
  padding: 36px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    linear-gradient(
      140deg,
      rgba(255, 250, 241, 0.96),
      rgba(252, 246, 236, 0.9)
    ),
    var(--paper);
  box-shadow: var(--shadow);
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto -40px -60px auto;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: rgba(140, 79, 43, 0.08);
  filter: blur(6px);
}

.eyebrow {
  display: inline-flex;
  gap: 8px;
  align-items: center;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-size: 0.84rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.hero h1 {
  margin: 18px 0 10px;
  font-size: clamp(2rem, 4vw, 3.4rem);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.hero p {
  max-width: 52rem;
  margin: 0;
  color: var(--muted);
  font-size: 1.04rem;
}

.meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.meta span {
  padding: 8px 12px;
  border-radius: 999px;
  border: 1px solid var(--line);
  background: rgba(255, 255, 255, 0.68);
  font-size: 0.92rem;
}

.layout {
  display: grid;
  grid-template-columns: minmax(0, 250px) minmax(0, 1fr);
  gap: 24px;
  margin-top: 24px;
}

.card {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--paper);
  box-shadow: var(--shadow);
}

.nav {
  position: sticky;
  top: 20px;
  padding: 24px 20px;
}

.nav h2,
.content h2 {
  margin: 0 0 14px;
  font-size: 1rem;
}

.nav ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav li + li {
  margin-top: 10px;
}

.nav a {
  display: block;
  padding: 10px 12px;
  border-radius: 14px;
  text-decoration: none;
  color: var(--ink);
  border: 1px solid transparent;
}

.nav a[aria-current="page"],
.nav a:hover {
  border-color: var(--line);
  background: rgba(255, 255, 255, 0.7);
}

.content {
  padding: 28px;
}

.content section + section {
  margin-top: 28px;
  padding-top: 28px;
  border-top: 1px solid var(--line);
}

.content h2 {
  font-size: 1.55rem;
}

.content h3 {
  margin: 0 0 10px;
  font-size: 1.08rem;
}

.content p,
.content li,
.content dd {
  color: var(--muted);
}

.content ul {
  margin: 12px 0 0;
  padding-left: 1.25rem;
}

.content li + li {
  margin-top: 10px;
}

.summary {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: var(--paper-strong);
}

.summary p {
  margin: 0;
}

.definition-list {
  display: grid;
  gap: 14px;
}

.definition-list div {
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: 18px;
  background: rgba(255, 255, 255, 0.7);
}

.definition-list dt {
  font-weight: 700;
}

.definition-list dd {
  margin: 8px 0 0;
}

.warning {
  padding: 16px 18px;
  border-radius: 16px;
  background: rgba(140, 79, 43, 0.08);
}

.placeholder {
  font-weight: 700;
  color: #9d3412;
}

.footer {
  margin-top: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 0.94rem;
}

@media (max-width: 860px) {
  .layout {
    grid-template-columns: 1fr;
  }

  .nav {
    position: static;
  }
}

@media (max-width: 640px) {
  .shell {
    padding: 24px 14px 44px;
  }

  .hero,
  .content,
  .nav {
    padding: 22px 18px;
  }

  .hero h1 {
    font-size: 2rem;
  }
}