:root {
  color-scheme: light;
  --bg: #f5f2eb;
  --panel: #ffffff;
  --panel-soft: #faf8f3;
  --text: #1f2933;
  --heading: #101820;
  --muted: #5f6872;
  --border: #d8d1c4;
  --border-strong: #b9ad9a;
  --accent: #1d4f73;
  --accent-dark: #143a56;
  --accent-soft: #e8eef2;
  --good: #265c46;
  --good-soft: #eef5f1;
  --caution: #7a5626;
  --caution-soft: #f7f1e8;
  --shadow: 0 10px 28px rgba(16, 24, 32, 0.08);
  --radius: 8px;
  --max: 1140px;
}

* { box-sizing: border-box; }

html { scroll-behavior: smooth; }

body {
  margin: 0;
  font-family: Inter, ui-sans-serif, system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  color: var(--text);
  background: var(--bg);
  line-height: 1.58;
}

body::before {
  content: "";
  position: fixed;
  inset: 0 0 auto;
  height: 4px;
  background: var(--accent-dark);
  z-index: 10;
}

a {
  color: var(--accent);
  text-underline-offset: 0.18em;
}

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

.site-shell {
  width: min(100% - 36px, var(--max));
  margin: 0 auto;
  padding: 42px 0 72px;
}

.topic-switcher {
  display: none;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  margin-bottom: 18px;
  padding: 12px 14px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 8px 20px rgba(16, 24, 32, 0.05);
  color: var(--muted);
  font-size: 0.92rem;
}

.topic-switcher > span {
  padding-left: 8px;
  font-weight: 700;
}

.topic-switcher > div {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: 8px;
}

.topic-link {
  display: inline-flex;
  align-items: center;
  min-height: 34px;
  padding: 6px 12px;
  border-radius: 6px;
  color: var(--muted);
  text-decoration: none;
  font-weight: 650;
}

.topic-link:hover,
.topic-link:focus,
.topic-link:active { color: var(--accent); }

.topic-link.active {
  color: var(--accent-dark);
  background: var(--accent-soft);
}

.hero {
  position: relative;
  padding: 56px 58px;
  border: 1px solid var(--border-strong);
  border-top: 5px solid var(--accent-dark);
  border-radius: var(--radius);
  background: linear-gradient(180deg, #fff 0%, #fbfaf7 100%);
  box-shadow: var(--shadow);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-bottom: 20px;
  padding: 0;
  border: 0;
  border-radius: 0;
  background: transparent;
  color: var(--accent-dark);
  font-size: 0.8rem;
  font-weight: 760;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.dot {
  width: 28px;
  height: 1px;
  border-radius: 0;
  background: var(--accent-dark);
}

h1, h2, h3, p { margin-top: 0; }

h1, h2, h3 {
  font-family: Georgia, "Times New Roman", serif;
  color: var(--heading);
  font-weight: 650;
}

h1 {
  max-width: 820px;
  margin-bottom: 20px;
  font-size: clamp(2.3rem, 5.4vw, 4.25rem);
  line-height: 1.02;
  letter-spacing: -0.035em;
}

.overview {
  max-width: 875px;
  color: var(--muted);
  font-size: clamp(1.02rem, 1.3vw, 1.14rem);
}

.overview p:last-child,
.markdown p:last-child,
.list-block li:last-child { margin-bottom: 0; }

section { margin-top: 46px; }

.section-jump-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.section-jump-links a {
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  padding: 8px 14px;
  border: 1px solid var(--border-strong);
  border-radius: 4px;
  color: var(--accent-dark);
  background: #fff;
  text-decoration: none;
  font-size: 0.92rem;
  font-weight: 720;
}

.section-jump-links a:hover,
.section-jump-links a:focus,
.section-jump-links a:active {
  color: #fff;
  border-color: var(--accent-dark);
  background: var(--accent-dark);
  text-decoration: none;
}

.section-header {
  display: grid;
  gap: 8px;
  margin-bottom: 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--border);
}

h2 {
  margin-bottom: 0;
  font-size: clamp(1.55rem, 2.8vw, 2.15rem);
  line-height: 1.12;
  letter-spacing: -0.025em;
}

.section-note {
  max-width: 620px;
  margin: 0;
  color: var(--muted);
  font-size: 0.95rem;
}

.path-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--panel);
  box-shadow: 0 8px 22px rgba(16, 24, 32, 0.045);
}

.path-card {
  padding: 24px;
  min-height: 190px;
  border-top: 3px solid var(--accent-dark);
}

.path-card h3 {
  margin-bottom: 12px;
  font-size: 1.2rem;
  letter-spacing: -0.015em;
}

.path-card .markdown { color: var(--muted); }

.source-files-section { margin-top: 52px; }

.source-panel { padding: 28px; }

.source-button {
  display: inline-flex;
  align-items: center;
  min-height: 42px;
  margin-top: 4px;
  padding: 9px 16px;
  border: 1px solid var(--accent-dark);
  border-radius: 4px;
  color: #fff;
  background: var(--accent-dark);
  text-decoration: none;
  font-weight: 760;
  box-shadow: none;
}

.source-button:hover,
.source-button:focus,
.source-button:active {
  color: #fff;
  background: #0f2c42;
  text-decoration: none;
}

.resource-block { margin-top: 30px; }

.small-header h3 {
  margin: 0;
  font-size: clamp(1.2rem, 2vw, 1.5rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
}

.resource-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.resource-card {
  padding: 18px;
  background: var(--panel-soft);
  box-shadow: none;
}

.resource-card a {
  color: var(--heading);
  font-weight: 760;
  text-decoration: none;
}

.resource-card a:hover,
.resource-card a:focus {
  color: var(--accent);
  text-decoration: underline;
}

.resource-meta {
  margin: 6px 0 8px;
  color: var(--muted);
  font-size: 0.82rem;
  font-weight: 650;
}

.resource-card p:last-child { margin-bottom: 0; }

.resource-card p:not(.resource-meta) {
  color: var(--muted);
  font-size: 0.92rem;
}

.argument-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  align-items: start;
}

.argument-column { overflow: hidden; }

.column-title {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 22px 24px;
  border-bottom: 1px solid var(--border);
  /*background: #f3f0e8;*/
  background: #f8f6f2;
}

.column-title h3 {
  margin: 0;
  font-size: 1.24rem;
  letter-spacing: -0.02em;
}

.count-pill {
  flex: none;
  padding: 5px 10px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--muted);
  background: #fff;
  font-size: 0.82rem;
  font-weight: 650;
}

.argument-list { display: grid; gap: 0; }

details {
  border-bottom: 1px solid var(--border);
  background: var(--panel);
}

details:last-child { border-bottom: 0; }

summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 18px 24px;
  font-weight: 720;
  letter-spacing: -0.005em;
}

summary::-webkit-details-marker { display: none; }

summary::after {
  content: "+";
  display: grid;
  place-items: center;
  flex: 0 0 26px;
  width: 26px;
  height: 26px;
  border: 1px solid var(--border-strong);
  border-radius: 50%;
  color: var(--accent-dark);
  background: #fff;
  font-weight: 800;
  transition: transform 160ms ease;
}

details[open] summary::after {
  content: "−";
  transform: rotate(180deg);
}

.detail-body {
  display: grid;
  gap: 16px;
  padding: 0 24px 24px;
  color: var(--muted);
}

.list-block {
  padding: 16px;
  border-radius: 6px;
  border: 1px solid var(--border);
  background: var(--panel-soft);
}

.list-block h4 {
  margin: 0 0 10px;
  font-size: 0.78rem;
  letter-spacing: 0.09em;
  text-transform: uppercase;
  color: var(--muted);
}

.claims h4 { color: var(--good); }
.claims {
  background: var(--good-soft);
  border-color: rgba(38, 92, 70, 0.22);
}

.counterarguments h4 { color: var(--caution); }
.counterarguments {
  background: var(--caution-soft);
  border-color: rgba(122, 86, 38, 0.22);
}

ul {
  margin: 0;
  padding-left: 1.15rem;
}

li + li { margin-top: 0.65rem; }

footer {
  display: flex;
  justify-content: center;
  margin-top: 40px;
  color: var(--muted);
}

.github-link {
  display: inline-grid;
  place-items: center;
  width: 52px;
  height: 52px;
  border: 1px solid var(--border);
  border-radius: 50%;
  color: var(--muted);
  background: var(--panel);
  text-decoration: none;
}

.github-link:hover,
.github-link:focus,
.github-link:active {
  color: var(--accent-dark);
  border-color: var(--border-strong);
  background: var(--panel);
  transform: none;
}

@media (max-width: 860px) {
  .hero {
    padding: 34px 26px;
  }

  .hero::after { display: none; }

  .path-grid,
  .argument-grid,
  .resource-grid {
    grid-template-columns: 1fr;
  }

  .path-card { min-height: auto; }
}

@media (max-width: 520px) {
  .site-shell {
    width: min(100% - 22px, var(--max));
    padding-top: 24px;
  }

  .hero {
    border-radius: var(--radius);
    padding: 28px 20px;
  }

  .topic-switcher {
    align-items: flex-start;
    flex-direction: column;
  }

  .topic-switcher > div { justify-content: flex-start; }

  .path-card,
  summary,
  .column-title {
    padding-left: 18px;
    padding-right: 18px;
  }

  .detail-body {
    padding-left: 18px;
    padding-right: 18px;
  }
}