* { box-sizing: border-box; margin: 0; padding: 0; }
body { font-family: system-ui, -apple-system, sans-serif; color: #1a1a1a; background: #f8fafc; line-height: 1.65; }
main { max-width: 720px; margin: 0 auto; padding: 40px 20px; }
.back { margin-bottom: 24px; font-size: 0.95rem; }
h1 { color: #1e40af; font-size: 1.8rem; margin-bottom: 4px; }
.meta { color: #64748b; font-size: 0.9rem; margin-bottom: 24px; }
h2 { color: #1e3a5f; font-size: 1.15rem; margin: 28px 0 8px; }
p, ul { color: #334155; margin-bottom: 12px; }
ul { padding-left: 22px; }
li { margin-bottom: 6px; }
a { color: #1e40af; }
code { font-family: 'SF Mono', Consolas, monospace; font-size: 0.9em; background: #e2e8f0; padding: 1px 5px; border-radius: 4px; }
.callout { background: #fffbeb; border: 1px solid #fcd34d; border-radius: 6px; padding: 12px; color: #78350f; }
mark { background: #fde68a; padding: 0 3px; }
footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #e2e8f0; color: #64748b; font-size: 0.9rem; text-align: center; }