:root {
  --bg: #f8f8fb;
  --card: #ffffff;
  --text: #131313;
  --muted: #4b4b4b;
  --border: #e6e6ef;
  --accent: #8b5cf6;
}

* {
  box-sizing: border-box;
}

html,
body {
  margin: 0;
  padding: 0;
  background: radial-gradient(circle at top, #ffffff 0%, var(--bg) 45%, #f2f2f8 100%);
  color: var(--text);
  font-family: 'Inter', sans-serif;
}

main {
  width: min(920px, calc(100% - 32px));
  margin: 40px auto;
  padding: 28px;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 16px;
  box-shadow: 0 14px 32px rgba(19, 19, 19, 0.05);
}

h1 {
  margin: 0 0 8px;
  font-size: clamp(1.7rem, 3vw, 2.4rem);
  letter-spacing: -0.03em;
}

h2 {
  margin: 30px 0 10px;
  font-size: clamp(1.05rem, 2.1vw, 1.35rem);
  letter-spacing: -0.015em;
}

p,
li {
  color: var(--muted);
  line-height: 1.65;
  font-size: 0.98rem;
}

ul {
  margin: 8px 0 0;
  padding-left: 22px;
}

a {
  color: var(--accent);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.meta {
  margin: 0;
  font-size: 0.9rem;
  color: #5e5e68;
}

.topnav {
  display: flex;
  gap: 16px;
  flex-wrap: wrap;
  margin-bottom: 22px;
}

.topnav a {
  text-decoration: none;
  padding: 8px 12px;
  border: 1px solid var(--border);
  border-radius: 999px;
  color: var(--text);
  font-size: 0.9rem;
}

.topnav a.active {
  border-color: transparent;
  background: var(--accent);
  color: #fff;
}

@media (max-width: 640px) {
  main {
    margin: 20px auto;
    padding: 20px;
    border-radius: 12px;
  }
}