:root {
  --bg: #FAFAF7;
  --surface: #FFFFFF;
  --text: #0A0A0A;
  --muted: #666;
  --border: #ededed;
  --link: #0A0A0A;
  --accent: #F5C518;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #0A0A0A;
    --surface: #161616;
    --text: #FAFAF7;
    --muted: #A0A0A0;
    --border: #2A2A2A;
    --link: #FAFAF7;
    --accent: #F5C518;
  }
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", "Inter", "Roboto", sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  padding: 24px 16px 64px;
}

main {
  max-width: 680px;
  margin: 0 auto;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 32px 28px;
}

header {
  max-width: 680px;
  margin: 0 auto 20px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 4px;
}

.brand {
  font-weight: 700;
  font-size: 20px;
  letter-spacing: -0.3px;
  color: var(--text);
  text-decoration: none;
}

.brand .dot {
  color: var(--accent);
}

header nav {
  display: flex;
  gap: 16px;
  font-size: 14px;
}

header nav a {
  color: var(--muted);
  text-decoration: none;
}

header nav a:hover {
  color: var(--text);
}

header nav a[aria-current="page"] {
  color: var(--text);
  font-weight: 600;
}

h1 {
  font-size: 28px;
  line-height: 1.25;
  margin: 0 0 8px;
  letter-spacing: -0.5px;
}

h2 {
  font-size: 20px;
  line-height: 1.3;
  margin: 32px 0 12px;
  letter-spacing: -0.3px;
}

h3 {
  font-size: 16px;
  line-height: 1.4;
  margin: 20px 0 8px;
  color: var(--text);
}

p {
  margin: 0 0 12px;
  color: var(--text);
}

ul {
  margin: 0 0 12px;
  padding-left: 24px;
}

li {
  margin: 4px 0;
}

a {
  color: var(--link);
  text-decoration: underline;
  text-underline-offset: 2px;
}

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

code {
  font-family: "JetBrains Mono", "SF Mono", "Consolas", monospace;
  font-size: 13px;
  background: var(--bg);
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid var(--border);
}

.effective {
  color: var(--muted);
  font-size: 14px;
  margin: 0 0 32px;
}

.landing-card {
  display: block;
  padding: 20px 24px;
  margin: 12px 0;
  border: 1px solid var(--border);
  border-radius: 8px;
  color: var(--text);
  text-decoration: none;
  transition: border-color 0.15s, transform 0.15s;
}

.landing-card:hover {
  border-color: var(--accent);
  transform: translateY(-1px);
}

.landing-card h3 {
  margin: 0 0 4px;
  font-size: 17px;
}

.landing-card p {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
}

footer {
  max-width: 680px;
  margin: 32px auto 0;
  padding: 0 4px;
  font-size: 13px;
  color: var(--muted);
  text-align: center;
}

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