:root {
    color-scheme: light;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, "Noto Sans SC", sans-serif;
    color: #333;
    background: #f5f5f5;
    line-height: 1.8;
}

* { box-sizing: border-box; }
body { margin: 0; }
.container {
    max-width: 900px;
    min-height: 100vh;
    margin: 0 auto;
    padding: 36px 28px;
    background: #fff;
}
.page-nav, .footer-links { display: flex; flex-wrap: wrap; gap: 8px 20px; }
.page-nav { margin-bottom: 28px; font-size: .95rem; }
header { margin-bottom: 28px; padding-bottom: 24px; border-bottom: 2px solid #e0e0e0; }
h1 { margin: 0 0 12px; color: #1a1a1a; font-size: 2rem; line-height: 1.45; }
h2 { margin: 32px 0 16px; padding-bottom: 8px; border-bottom: 2px solid #0066cc; font-size: 1.3rem; }
h3 { margin: 24px 0 12px; font-size: 1.08rem; }
p { margin: 0 0 16px; }
ul, ol { padding-left: 24px; }
li { margin-bottom: 8px; }
a { color: #005dbb; text-decoration: underline; text-underline-offset: 3px; overflow-wrap: anywhere; }
a:hover { color: #003e7d; }
a:focus-visible { outline: 3px solid #0066cc; outline-offset: 4px; border-radius: 2px; }
.date-info, footer { color: #666; font-size: .9rem; }
.date-info p { margin-bottom: 4px; }
.intro, .toc, .contact-info { padding: 20px; border-radius: 8px; margin: 24px 0; }
.intro { background: #f9f9f9; }
.reminder { padding: 16px 20px; background: #fff7dc; border-left: 4px solid #d99c00; margin: 24px 0; }
.toc { background: #f0f7ff; }
.toc h2 { margin-top: 0; border: 0; padding: 0; font-size: 1.15rem; }
.toc ul { margin-bottom: 0; }
.contact-info { background: #eef7ee; }
.intro p:last-child, .reminder p:last-child, .contact-info p:last-child { margin-bottom: 0; }
section { scroll-margin-top: 20px; }
.document-links { list-style: none; padding: 0; }
.document-links li { padding: 20px; background: #f0f7ff; border-radius: 8px; margin: 16px 0; }
.document-links a { font-size: 1.15rem; font-weight: 600; }
.document-links p { margin: 8px 0 0; }
footer { margin-top: 40px; padding-top: 20px; border-top: 1px solid #e0e0e0; }
footer p { margin-top: 12px; }
@media (max-width: 600px) {
    .container { padding: 24px 18px; }
    h1 { font-size: 1.65rem; }
    h2 { font-size: 1.2rem; }
    .intro, .toc, .contact-info, .reminder { padding: 16px; }
}
@media print {
    :root, .container { background: #fff; color: #000; }
    .container { max-width: none; padding: 0; }
    .page-nav, .footer-links { display: none; }
    h2, h3 { break-after: avoid; }
    a { color: #000; }
}