:root { --max: 920px; }
html { font-size: 16px; }
body { font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, 'PingFang SC', 'Microsoft YaHei', sans-serif; line-height: 1.75; color: #1f2937; background: #fff; margin: 0; }
.wrap { max-width: var(--max); margin: 0 auto; padding: 2.5rem 1.25rem 4rem; }
h1, h2, h3 { line-height: 1.3; color: #111827; }
h1 { font-size: 2rem; margin: 0 0 1rem; }
h2 { font-size: 1.25rem; margin: 2rem 0 .75rem; }
p { margin: .75rem 0; }
ul { margin: .5rem 0 .5rem 1.25rem; }
.meta { color: #6b7280; font-size: .9375rem; margin-bottom: 1.25rem; }
.note { background: #f9fafb; border: 1px solid #e5e7eb; padding: .875rem 1rem; border-radius: .5rem; }
a { color: #0ea5e9; text-decoration: none; }
a:hover { text-decoration: underline; }
hr { border: none; border-top: 1px solid #e5e7eb; margin: 2rem 0; }
#main header{display:none}