:root {
  --text: #1a1a1a;
  --muted: #5c5c5c;
  --accent: #1976d2;
  --bg: #fafafa;
  --card: #ffffff;
  --border: #e0e0e0;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  font-size: 16px;
  line-height: 1.65;
  color: var(--text);
  background: var(--bg);
}

.page {
  max-width: 720px;
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  background: var(--card);
  min-height: 100vh;
}

@media (min-width: 640px) {
  .page {
    margin-top: 2rem;
    margin-bottom: 2rem;
    min-height: auto;
    border: 1px solid var(--border);
    border-radius: 12px;
    box-shadow: 0 1px 3px rgba(0, 0, 0, 0.06);
  }
}

h1 {
  font-size: 1.75rem;
  margin: 0 0 0.25rem;
  color: var(--accent);
}

h2 {
  font-size: 1.15rem;
  margin: 2rem 0 0.75rem;
  color: #333;
}

h3 {
  font-size: 1rem;
  margin: 1.25rem 0 0.5rem;
}

p, ul {
  margin: 0 0 1rem;
}

ul {
  padding-left: 1.35rem;
}

li {
  margin-bottom: 0.35rem;
}

.lead {
  font-size: 1.05rem;
  color: var(--muted);
}

.meta {
  font-size: 0.9rem;
  color: var(--muted);
}

.nav-links {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0;
}

.nav-links a {
  display: inline-block;
  padding: 0.6rem 1rem;
  margin: 0.25rem 0.5rem 0.25rem 0;
  background: var(--accent);
  color: #fff;
  text-decoration: none;
  border-radius: 8px;
  font-weight: 500;
}

.nav-links a:hover {
  filter: brightness(1.08);
}

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

.back {
  display: inline-block;
  margin-bottom: 1.5rem;
  font-size: 0.9rem;
}

strong {
  font-weight: 600;
}