body {
  font-family: Arial, Helvetica, sans-serif;
  line-height: 1.65;
  color: #1f2937;
  max-width: 880px;
  margin: 0 auto;
  padding: 24px 16px 48px;
  background: #fff;
}
h1 { font-size: 1.85rem; margin: 0 0 8px; color: #111827; }
h2 { font-size: 1.2rem; margin: 28px 0 10px; border-bottom: 1px solid #e5e7eb; padding-bottom: 6px; color: #111827; }
h3 { font-size: 1.05rem; margin: 18px 0 8px; color: #312e81; }
p, li { font-size: 0.98rem; }
ol, ul { padding-left: 1.35rem; }
li { margin: 8px 0; }
.meta { color: #4b5563; font-size: 0.92rem; margin-bottom: 20px; }
.box { background: #f5f7ff; border: 1px solid #d8def8; padding: 16px; border-radius: 8px; }
a { color: #3730a3; }
nav, footer { font-size: 0.9rem; margin: 16px 0; }
nav a, footer a { margin-right: 4px; }
footer { border-top: 1px solid #e5e5e5; padding-top: 16px; color: #6b7280; }
.brand { font-weight: 700; color: #111827; margin-bottom: 8px; }