* { margin: 0; padding: 0; box-sizing: border-box; }
body { font-family: Georgia, 'Times New Roman', serif; background: #f0eeeb; color: #2c2c2c; line-height: 1.7; font-size: 17px; }
nav { position: fixed; top: 0; width: 100%; background: #3a3a3a; z-index: 100; display: flex; align-items: center; padding: 0 20px; height: 52px; flex-wrap: wrap; }
nav .logo { color: #e8e0d0; font-size: 20px; font-weight: bold; letter-spacing: 2px; margin-right: 40px; text-decoration: none; }
nav a { color: #c8c0b0; text-decoration: none; padding: 14px 12px; font-size: 14px; transition: color 0.2s; }
nav a:hover, nav a.active { color: #fff; }
main { max-width: 780px; margin: 72px auto 60px; padding: 0 24px; }
h1 { font-size: 32px; font-weight: normal; margin-bottom: 8px; color: #1a1a1a; border-bottom: 1px solid #ccc; padding-bottom: 12px; }
h2 { font-size: 22px; font-weight: normal; margin: 36px 0 12px; color: #1a1a1a; }
h3 { font-size: 18px; font-weight: bold; margin: 28px 0 8px; color: #2c2c2c; }
p { margin-bottom: 14px; }
a.lib-link { display: inline-block; margin-top: 8px; font-size: 14px; color: #666; }
a.lib-link:hover { color: #333; }
.section-block { background: #e8e5e0; padding: 20px 24px; margin: 20px 0; border-left: 3px solid #aaa; }
.note { background: #e0ddd8; padding: 14px 18px; font-size: 14px; color: #555; margin: 20px 0; border-radius: 3px; }
.outline-item { padding: 6px 0 6px 20px; border-left: 2px solid #ccc; margin: 4px 0; font-size: 15px; color: #444; }
.principle-item { padding: 12px 0; border-bottom: 1px solid #ddd; }
.principle-item:last-child { border-bottom: none; }
.principle-name { font-weight: bold; font-size: 18px; }
.circle-block { margin: 24px 0; padding: 20px 24px; background: #eae7e2; border-left: 3px solid #888; }
.circle-title { font-size: 18px; font-weight: bold; margin-bottom: 8px; }
.circle-subtitle { font-style: italic; color: #666; margin-bottom: 12px; }
.stub { background: #e8e5e0; border: 1px dashed #bbb; padding: 40px 30px; text-align: center; margin: 20px 0; border-radius: 4px; }
.stub p { color: #888; font-style: italic; margin: 0; }
.lib-item { display: block; padding: 10px 16px; margin: 4px 0; background: #eae7e2; border-radius: 3px; text-decoration: none; color: #2c2c2c; }
.lib-item:hover { background: #e0ddd8; }
.lib-section { margin: 24px 0; }
.lib-section h3 { margin-bottom: 12px; border-bottom: 1px solid #ddd; padding-bottom: 6px; }
.back-link { display: inline-block; margin-bottom: 20px; font-size: 14px; color: #888; text-decoration: none; }
.back-link:hover { color: #333; }
footer { text-align: center; padding: 30px; font-size: 13px; color: #999; border-top: 1px solid #ddd; margin-top: 60px; }