:root {
  --brand: #4138ff;
  --bg: #f7f6ff;
  --text: #1f1f2f;
  --muted: #5a5c70;
}

* { box-sizing: border-box; margin: 0; padding: 0; }
body {
  font-family: 'PingFang SC', 'Helvetica Neue', sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.7;
}

.page {
  max-width: 800px;
  margin: 0 auto;
  padding: 40px 20px 80px;
}

header { margin-bottom: 30px; }

.back {
  text-decoration: none;
  color: var(--brand);
  font-weight: 600;
}

h1 { font-size: 2.2rem; margin: 16px 0 8px; }

h2 { margin: 32px 0 12px; }

section { margin-bottom: 16px; }

p, li { color: var(--muted); margin-bottom: 10px; }

ul { list-style: disc; padding-left: 20px; }