:root {
  color-scheme: light;
  --bg: #ffffff;
  --fg: #0f172a;
  --muted: #475569;
  --border: #e2e8f0;
  --link: #2563eb;
  --container: 860px;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--fg);
  font-family:
    ui-sans-serif,
    system-ui,
    -apple-system,
    Segoe UI,
    Roboto,
    Helvetica,
    Arial,
    "Apple Color Emoji",
    "Segoe UI Emoji";
  line-height: 1.55;
}

a {
  color: var(--link);
  text-decoration: none;
}
a:hover {
  text-decoration: underline;
}

code {
  font-family:
    ui-monospace,
    SFMono-Regular,
    Menlo,
    Monaco,
    Consolas,
    "Liberation Mono",
    "Courier New",
    monospace;
  font-size: 0.95em;
}

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

.site-header {
  border-bottom: 1px solid var(--border);
  background: var(--bg);
}

.header-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 14px 0;
}

.brand {
  font-weight: 700;
  color: var(--fg);
}

.content {
  padding: 28px 16px 48px;
}

.markdown h1 {
  margin: 0 0 12px;
  font-size: 34px;
  letter-spacing: -0.02em;
}
.markdown h2 {
  margin: 28px 0 12px;
  font-size: 22px;
  letter-spacing: -0.01em;
}
.markdown h3 {
  margin: 18px 0 10px;
  font-size: 18px;
}
.markdown p {
  margin: 0 0 12px;
  color: var(--fg);
}
.markdown ul,
.markdown ol {
  margin: 0 0 12px;
  padding-left: 18px;
}
.markdown li {
  margin: 6px 0;
}
.markdown hr {
  border: 0;
  border-top: 1px solid var(--border);
  margin: 24px 0;
}
.markdown strong {
  color: var(--fg);
}
.markdown :where(p, li) {
  color: var(--fg);
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 20px 0;
}

.footer-row {
  display: flex;
  justify-content: space-between;
  gap: 16px;
  align-items: center;
  color: var(--muted);
  font-size: 14px;
}

.footer-links {
  display: flex;
  gap: 14px;
}

@media (max-width: 640px) {
  .header-row {
    flex-direction: column;
    align-items: flex-start;
  }
  .footer-row {
    flex-direction: column;
    align-items: flex-start;
  }
}