*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#1e3a8a;line-height:1.75;font-size:16px}
a{color:#2563eb;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:960px;margin:0 auto;padding:0 20px}

.site-header{background:#fff;border-bottom:2px solid #bfdbfe;position:sticky;top:0;z-index:200}
.header-row{display:flex;align-items:center;justify-content:space-between;padding:12px 0;position:relative}
.brand{display:flex;align-items:center;gap:10px;font-size:1rem;color:#1e3a8a;font-weight:500}
.brand:hover{text-decoration:none}
.brand b{color:#2563eb;font-weight:700}
.brand img{border-radius:6px}
.site-nav ul{display:flex;gap:6px 16px;list-style:none;flex-wrap:wrap}
.site-nav a{color:#57534e;font-size:.9rem;padding:4px 0}
.site-nav a.active{color:#2563eb;font-weight:600;border-bottom:2px solid #2563eb}
.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:#444;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:#eff6ff;border-bottom:1px solid #bfdbfe;padding:10px 0}
.applist-title{font-size:.78rem;color:#1d4ed8;text-align:center;margin-bottom:6px}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
#ads .caption{font-size:.7rem;color:#78716c;margin-top:4px;text-align:center;max-width:70px;line-height:1.3}

.hero{padding:44px 0 20px;border-bottom:1px solid #dbeafe}
.hero .tag{display:inline-block;font-size:.76rem;font-weight:700;color:#2563eb;background:#dbeafe;padding:4px 12px;margin-bottom:14px}
.hero h1{font-family:"Source Serif 4","Noto Sans SC",serif;font-size:1.85rem;line-height:1.32;margin-bottom:16px;color:#1e3a8a;max-width:820px}
.hero .deck{font-size:1.04rem;color:#444;max-width:760px}

.mag-nav{display:flex;flex-wrap:wrap;gap:8px;padding:18px 0;border-bottom:1px solid #e7e5e4}
.mag-nav a{font-size:.82rem;padding:5px 12px;border:1px solid #bfdbfe;color:#1d4ed8;background:#fff}
.mag-nav a:hover{background:#eff6ff;text-decoration:none}

.mag{padding:28px 0 40px}
.mag-block{display:grid;grid-template-columns:1fr 260px;gap:28px;padding:32px 0;border-bottom:1px solid #e7e5e4;align-items:start}
.col-main h2{font-family:"Source Serif 4","Noto Sans SC",serif;font-size:1.28rem;margin-bottom:12px;color:#1e3a8a}
.col-main p{color:#444;margin-bottom:10px;font-size:.97rem}
.col-main figure{margin:16px 0 4px;max-width:400px;border:1px solid #dbeafe;overflow:hidden}
.col-main figcaption{font-size:.84rem;color:#78716c;margin-top:6px}
.col-side{position:sticky;top:88px}
.pull{font-family:"Source Serif 4","Noto Sans SC",serif;font-size:1.12rem;line-height:1.45;color:#1d4ed8;border-left:3px solid #2563eb;padding:8px 0 8px 16px;margin:0 0 12px;font-weight:600}
.side-note{font-size:.88rem;color:#57534e;line-height:1.6}

.faq{padding:12px 0 56px}
.faq > h2{font-family:"Source Serif 4","Noto Sans SC",serif;font-size:1.35rem;margin-bottom:18px;text-align:center}
.faq-list details{border-top:1px solid #dbeafe;padding:14px 4px}
.faq-list summary{cursor:pointer;font-weight:600;font-size:.96rem;color:#1e3a8a}
.faq-list p{margin-top:8px;color:#57534e;font-size:.93rem}

.prose-page{padding:36px 0 48px;max-width:720px}
.prose-page h1{font-size:1.5rem;margin-bottom:16px}
.prose-page h2{font-size:1.1rem;margin:20px 0 8px}
.prose-page p{margin-bottom:12px;color:#444}
.site-footer{background:#fafaf9;border-top:1px solid #e7e5e4;padding:26px 0;text-align:center;font-size:.88rem;color:#78716c}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:10px}
.footer-links a{color:#57534e}
.error-page{text-align:center;padding:80px 20px}
.error-page h1{font-size:3rem;color:#2563eb;margin-bottom:12px}

@media(max-width:800px){
  .mag-block{grid-template-columns:1fr;gap:16px}
  .col-side{position:static}
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #e7e5e4;padding:12px 20px;display:none}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:10px}
  .hero h1{font-size:1.45rem}
}