:root {
  color-scheme: light dark;
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1b1f24;
  --muted: #5c6572;
  --accent: #2f6fed;
  --border: #e2e6ec;
}

@media (prefers-color-scheme: dark) {
  :root {
    --bg: #101216;
    --card: #181b21;
    --text: #e7eaee;
    --muted: #a3acb8;
    --accent: #7fa6ff;
    --border: #2a2f37;
  }
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font: 16px/1.65 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}

main {
  max-width: 760px;
  margin: 0 auto;
  padding: 40px 20px 8px;
}

.card {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  padding: 34px 36px;
}

h1 {
  font-size: 1.9rem;
  line-height: 1.2;
  margin: 0 0 6px;
}

h2 {
  font-size: 1.18rem;
  line-height: 1.3;
  margin: 32px 0 8px;
}

h3 {
  font-size: 1rem;
  line-height: 1.4;
  margin: 22px 0 4px;
}

p {
  margin: 8px 0;
}

ul {
  margin: 8px 0;
  padding-left: 1.3em;
}

li {
  margin: 4px 0;
}

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

.meta {
  color: var(--muted);
  font-size: 0.92rem;
  margin: 0 0 26px;
}

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

footer {
  max-width: 760px;
  margin: 0 auto;
  padding: 18px 20px 40px;
  color: var(--muted);
  font-size: 0.84rem;
  text-align: center;
}

footer p {
  margin: 0;
}

@media (max-width: 520px) {
  main {
    padding: 16px 10px 4px;
  }

  .card {
    padding: 22px 18px;
    border-radius: 12px;
  }

  h1 {
    font-size: 1.55rem;
  }
}