:root {
  --bg: #ffffff;
  --text: #1a1a1a;
  --muted: #5a5a5a;
  --accent: #c8a04a;
  --border: #e6e6e6;
  --card-bg: #fafafa;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
    Ubuntu, Cantarell, sans-serif;
  font-size: 17px;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

.site-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  padding: 16px 24px;
  background: var(--bg);
}

.site-header .brand {
  font-weight: 700;
  font-size: 19px;
  color: var(--text);
  text-decoration: none;
  letter-spacing: -0.01em;
}

.site-header nav a {
  color: var(--muted);
  text-decoration: none;
  margin-left: 24px;
  font-size: 15px;
}

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

.container {
  max-width: 720px;
  margin: 0 auto;
  padding: 32px 24px 80px;
}

h1 {
  font-size: 32px;
  letter-spacing: -0.02em;
  margin: 32px 0 8px;
}

h2 {
  font-size: 22px;
  letter-spacing: -0.01em;
  margin: 40px 0 12px;
}

h3 {
  font-size: 17px;
  margin: 24px 0 8px;
}

p,
ul,
ol {
  margin: 0 0 16px;
}

ul,
ol {
  padding-left: 24px;
}

li {
  margin-bottom: 6px;
}

a {
  color: var(--text);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-underline-offset: 3px;
}

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

.tagline {
  font-size: 19px;
  color: var(--muted);
  margin-bottom: 32px;
}

.card {
  background: var(--card-bg);
  border: 1px solid var(--border);
  border-radius: 12px;
  padding: 20px 24px;
  margin: 24px 0;
}

.effective {
  background: var(--card-bg);
  border-left: 3px solid var(--accent);
  padding: 12px 16px;
  margin: 0 0 32px;
  font-size: 15px;
}

.site-footer {
  border-top: 1px solid var(--border);
  padding: 24px;
  text-align: center;
  color: var(--muted);
  font-size: 14px;
}

.site-footer a {
  color: var(--muted);
  margin: 0 8px;
}

@media (max-width: 520px) {
  .site-header {
    padding: 12px 16px;
  }
  .site-header nav a {
    margin-left: 12px;
    font-size: 14px;
  }
  .container {
    padding: 24px 16px 60px;
  }
  h1 {
    font-size: 26px;
  }
  h2 {
    font-size: 19px;
  }
}