*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",sans-serif;background:#fff;color:#1a1a1a;line-height:1.75;font-size:16px}
a{color:#1565c0;text-decoration:none}a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:1140px;margin:0 auto;padding:0 20px}
.site-header{background:#fff;border-bottom:2px solid #111;position:sticky;top:0;z-index:300}
.header-row{display:flex;align-items:center;justify-content:space-between;gap:16px;padding:12px 0;position:relative}
.brand{display:flex;align-items:center;gap:10px;color:#111;font-weight:600;font-size:.95rem}
.brand:hover{text-decoration:none}.brand img{border-radius:4px}.brand b{color:#1565c0;font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none}
.site-nav a{color:#555;font-size:.9rem;padding:4px 0}
.site-nav a.active,.site-nav a:hover{color:#0d47a1;font-weight:600;border-bottom:2px solid #1565c0;text-decoration:none}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:#333;transition:.2s}
.nav-toggle.is-open span:nth-child(1){transform:translateY(7px) rotate(45deg)}
.nav-toggle.is-open span:nth-child(2){opacity:0}
.nav-toggle.is-open span:nth-child(3){transform:translateY(-7px) rotate(-45deg)}
.ads-top-bar{background:#fafafa;border-bottom:1px solid #ddd;padding:10px 0}
.applist-title{font-size:.78rem;color:#888;text-align:center;margin-bottom:6px}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
#ads .caption{font-size:.7rem;color:#666;margin-top:4px;text-align:center;max-width:70px;line-height:1.3}
.site-footer{background:#fafafa;border-top:2px solid #111;padding:28px 0;text-align:center;font-size:.88rem;color:#666}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:14px;margin-bottom:10px}
.footer-links a{color:#555}
.prose-page{max-width:720px;margin:0 auto;padding:32px 20px 48px}
.prose-page h1{font-size:1.5rem;margin-bottom:16px}
.prose-page p{margin-bottom:12px;color:#333}
.error-page{text-align:center;padding:48px 20px 24px}
.error-page h1{font-size:3rem;color:#1565c0}
@media(max-width:640px){
.nav-toggle{display:flex}
.site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #eee;padding:12px 20px;display:none}
.site-nav.is-open{display:block}.site-nav ul{flex-direction:column;gap:10px}
}

.ribbon-hero{background:linear-gradient(180deg,#fff 0%,#f5f5f5 100%);padding-bottom:8px}
.ribbon-band{background:#0d47a1;color:#fff;text-align:center;padding:10px 20px;font-size:.85rem;font-weight:600;letter-spacing:.06em}
.ribbon-intro{padding:32px 20px 24px;max-width:820px}
.ribbon-intro h1{font-size:1.8rem;line-height:1.35;margin-bottom:16px}
.ribbon-intro p{color:#333;margin-bottom:12px;font-size:1.02rem;text-align:justify}
.ribbon-layout{display:grid;grid-template-columns:200px 1fr;gap:32px;padding:28px 0 24px;align-items:start}
.ribbon-sidebar{position:sticky;top:80px;border-left:4px solid #0d47a1;padding-left:16px}
.ribbon-sidebar ul{list-style:none}
.ribbon-sidebar li{margin-bottom:10px}
.ribbon-sidebar a{color:#555;font-size:.9rem;font-weight:500;display:block;padding:4px 0;border-bottom:1px dotted #ddd}
.ribbon-sidebar a:hover{color:#0d47a1;text-decoration:none;border-bottom-color:#0d47a1}
.ribbon-main section{margin-bottom:32px;padding-bottom:28px;border-bottom:1px solid #eee}
.ribbon-main h2{font-size:1.12rem;margin-bottom:12px;color:#111;padding-left:12px;border-left:4px solid #1565c0}
.ribbon-main p{margin-bottom:10px;color:#333;font-size:.96rem;text-align:justify}
.ribbon-main ul{margin:10px 0 12px 20px;color:#444;font-size:.92rem}
.ribbon-main li{margin-bottom:5px}
.ribbon-fig{margin:16px 0;border:1px solid #ccc}
.ribbon-fig figcaption{font-size:.78rem;color:#666;padding:6px 10px;background:#fafafa}
.ribbon-tip{margin:12px 0;padding:10px 14px;background:#e8eaf6;border-left:3px solid #3f51b5;font-size:.9rem;color:#283593}
.ribbon-close{border-bottom:none!important}
.ribbon-faq{padding:28px 0 36px;border-top:3px solid #0d47a1}
.ribbon-faq h2{font-size:1.2rem;text-align:center;margin-bottom:18px}
.ribbon-faq details{border:1px solid #ccc;margin-bottom:8px}
.ribbon-faq summary{padding:12px 16px;cursor:pointer;font-weight:500;list-style:none;background:#fafafa}
.ribbon-faq summary::-webkit-details-marker{display:none}
.ribbon-faq details[open] summary{border-bottom:1px solid #eee;background:#e3f2fd}
.ribbon-faq details p{padding:12px 16px;color:#444;font-size:.93rem}
.related-read{padding:16px 0 40px;border-top:1px solid #ddd}
.related-read h2{font-size:1rem;margin-bottom:12px;text-align:center}
.related-links{display:flex;flex-wrap:wrap;justify-content:center;gap:10px 16px}
.related-links a{font-size:.9rem;padding:6px 12px;border:1px solid #ddd;color:#333}
.related-links a:hover{background:#e3f2fd;text-decoration:none}
@media(max-width:768px){
.ribbon-layout{grid-template-columns:1fr}
.ribbon-sidebar{position:static;border-left:none;border-top:3px solid #0d47a1;padding:16px 0 0}
.ribbon-sidebar ul{display:flex;flex-wrap:wrap;gap:8px}
.ribbon-sidebar li{margin:0}
.ribbon-sidebar a{border:1px solid #ddd;padding:6px 10px;border-radius:4px}
}