*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#164e63;line-height:1.78;font-size:16px}
a{color:#0891b2;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:820px;margin:0 auto;padding:0 20px}

.site-header{background:#fff;border-bottom:1px solid #a5f3fc;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:#164e63;font-weight:500}
.brand:hover{text-decoration:none}
.brand b{color:#0891b2;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:#0891b2;font-weight:600;border-bottom:2px solid #0891b2}
.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:#ecfeff;border-bottom:1px solid #a5f3fc;padding:10px 0}
.applist-title{font-size:.78rem;color:#0e7490;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}

.band{padding:40px 0}
.band.soft{background:#f0fdfa}
.band.soft2{background:#ecfeff}
.band .tag{display:inline-block;font-size:.76rem;font-weight:700;color:#0891b2;background:#cffafe;padding:4px 12px;margin-bottom:14px}
.band h1{font-size:1.68rem;line-height:1.35;color:#164e63;margin-bottom:14px}
.band h2{font-size:1.2rem;color:#164e63;margin-bottom:12px}
.band .lead,.band p{color:#444;margin-bottom:10px;font-size:.97rem}
.band .lead{font-size:1.02rem}
.band figure{margin:16px 0 4px;max-width:480px;border:1px solid #a5f3fc;overflow:hidden}
.band figcaption{font-size:.84rem;color:#78716c;margin-top:6px}

.band-nav{padding:16px 0 8px}
.band-nav ul{list-style:none;display:flex;flex-wrap:wrap;gap:8px}
.band-nav a{display:inline-block;padding:6px 12px;border:1px solid #a5f3fc;font-size:.82rem;color:#0e7490;background:#fff}
.band-nav a:hover{background:#ecfeff;text-decoration:none}

.faq-band details{border:1px solid #a5f3fc;padding:12px 16px;margin-bottom:8px;background:#fff}
.faq-band summary{cursor:pointer;font-weight:600;font-size:.94rem}
.faq-band details p{margin-top:8px;margin-bottom:0;color:#57534e;font-size:.92rem}

.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:#0891b2;margin-bottom:12px}

@media(max-width:720px){
  .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}
  .band h1{font-size:1.38rem}
  .band{padding:28px 0}
}