*,*::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}
.hero-zone{padding:36px 0 24px;text-align:center;border-bottom:2px solid #111}
.hero-tag{display:inline-block;font-size:.78rem;letter-spacing:.08em;color:#1565c0;border:1px solid #1565c0;padding:4px 14px;border-radius:4px;margin-bottom:14px}
.hero-zone h1{font-size:1.8rem;line-height:1.35;margin-bottom:16px;max-width:820px;margin-left:auto;margin-right:auto}
.hero-lead{color:#333;margin-bottom:12px;font-size:1.02rem;text-align:justify;max-width:820px;margin-left:auto;margin-right:auto}
.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}
.extra-aside{padding:20px 0;border-top:1px dashed #ccc;max-width:820px;margin:0 auto}
.extra-aside p{color:#444;text-align:justify;font-size:.95rem;line-height:1.8}
@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}
}

.ring-wrap{display:grid;grid-template-columns:1fr 280px;gap:32px;padding:28px 0;align-items:start}
.ring-nav-col{position:sticky;top:80px}
.ring-nav{display:flex;flex-direction:column;gap:8px;border-left:3px solid #1565c0;padding-left:16px}
.ring-nav a{font-size:.88rem;padding:10px 14px;background:#f5f5f5;border-radius:0 8px 8px 0;color:#0d47a1;font-weight:500}
.ring-nav a:hover{background:#e3f2fd;text-decoration:none}
.ring-main article{margin-bottom:28px;padding:22px;border:1px solid #ddd;border-radius:12px;background:#fff}
.ring-main h2{font-size:1.12rem;margin-bottom:12px;color:#111}
.ring-main p{margin-bottom:10px;color:#333;text-align:justify;font-size:.95rem}
.ring-main figure{margin:14px 0;border:1px solid #eee;border-radius:8px;overflow:hidden}
.ring-main figcaption{font-size:.78rem;color:#666;padding:8px 12px;background:#fafafa}
.ring-faq{padding:24px 0 36px;border-top:2px solid #1565c0}
.ring-faq h2{font-size:1.15rem;margin-bottom:16px;text-align:center}
.ring-faq details{border:1px solid #ccc;margin-bottom:8px;border-radius:6px}
.ring-faq summary{padding:12px 16px;cursor:pointer;font-weight:500;list-style:none}
.ring-faq summary::-webkit-details-marker{display:none}
.ring-faq details[open] summary{background:#e3f2fd;border-bottom:1px solid #ddd}
.ring-faq details p{padding:12px 16px;color:#444;font-size:.93rem}
@media(max-width:900px){.ring-wrap{grid-template-columns:1fr}.ring-nav-col{position:static}.ring-nav{flex-direction:row;flex-wrap:wrap;border-left:none;padding-left:0;border-top:3px solid #1565c0;padding-top:12px}}