:root {
  --bg: #ffffff;
  --bg-soft: #f5f6f8;
  --text: #16181d;
  --text-muted: #5b6270;
  --border: #e3e6eb;
  --accent: #2f5bea;
  --accent-text: #ffffff;
  --radius: 12px;
  --max: 880px;
  color-scheme: light dark;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0f1115;
    --bg-soft: #171a21;
    --text: #e8eaee;
    --text-muted: #9aa1ad;
    --border: #262a33;
    --accent: #6d8dff;
    --accent-text: #0f1115;
  }
}

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

html {
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

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

.wrap {
  max-width: var(--max);
  margin: 0 auto;
  padding: 0 16px;
}

/* Header */
.site-header {
  border-bottom: 1px solid var(--border);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  min-height: 64px;
  flex-wrap: wrap;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  color: var(--text);
  text-decoration: none;
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.01em;
}

.brand-mark {
  display: inline-grid;
  place-items: center;
  width: 32px;
  height: 32px;
  border-radius: 8px;
  background: var(--accent);
  color: var(--accent-text);
  font-size: 18px;
}

.nav {
  display: flex;
  gap: 20px;
  flex-wrap: wrap;
}

.nav a {
  color: var(--text-muted);
  text-decoration: none;
  font-size: 15px;
}

.nav a:hover,
.nav a[aria-current="page"] {
  color: var(--text);
}

/* Content */
main {
  padding: 48px 0 64px;
}

h1 {
  font-size: clamp(30px, 5vw, 42px);
  line-height: 1.15;
  letter-spacing: -0.02em;
  margin: 0 0 16px;
}

h2 {
  font-size: 24px;
  line-height: 1.25;
  margin: 48px 0 12px;
}

h3 {
  font-size: 18px;
  margin: 28px 0 8px;
}

.lead {
  font-size: 19px;
  color: var(--text-muted);
  max-width: 640px;
  margin: 0;
}

.muted {
  color: var(--text-muted);
}

.cards {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(240px, 1fr));
  gap: 16px;
  margin-top: 16px;
}

.card {
  background: var(--bg-soft);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
}

.card h3 {
  margin-top: 0;
}

.card p {
  margin: 0 0 12px;
}

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

.facts {
  display: grid;
  grid-template-columns: max-content 1fr;
  gap: 8px 24px;
  margin: 16px 0 0;
}

.facts dt {
  color: var(--text-muted);
}

.facts dd {
  margin: 0;
  overflow-wrap: anywhere;
}

@media (max-width: 520px) {
  .facts {
    grid-template-columns: 1fr;
    gap: 2px;
  }

  .facts dd {
    margin-bottom: 10px;
  }
}

.prose {
  max-width: 720px;
}

.prose ul {
  padding-left: 22px;
}

/* Footer */
.site-footer {
  border-top: 1px solid var(--border);
  padding: 28px 0 40px;
  font-size: 14px;
  color: var(--text-muted);
}

.site-footer p {
  margin: 0 0 6px;
}

.site-footer a {
  color: var(--text-muted);
}