*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--accent:#0891b2;--ink:#1a1a1a;--muted:#555;--line:#e5e7eb;--bg:#fff}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:"Noto Sans SC",sans-serif;background:var(--bg);color:var(--ink);line-height:1.8;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}
.container{width:min(100% - 2rem,1100px);margin-inline:auto}
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.header-row{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:1rem}
.brand{display:flex;align-items:center;gap:.6rem;font-weight:700;color:var(--ink);text-decoration:none}
.brand b{color:var(--accent)}
.site-nav ul{display:flex;gap:1rem;list-style:none;margin:0;padding:0;flex-wrap:wrap}
.site-nav a{color:var(--muted);font-weight:500;padding:.25rem 0;border-bottom:2px solid transparent;text-decoration:none}
.site-nav a.active,.site-nav a:hover{color:var(--accent);border-bottom-color:var(--accent)}
.nav-toggle{display:none;flex-direction:column;gap:5px;width:44px;height:44px;border:1px solid #ddd;border-radius:8px;background:#fff;cursor:pointer;padding:10px}
.nav-toggle span{height:2px;background:#333;border-radius:2px;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{padding:.75rem 0;background:#fafafa;border-bottom:1px solid var(--line)}
.applist-title{font-size:.85rem;font-weight:700;text-align:center;color:var(--accent);margin:0 0 .5rem}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem .8rem}
.ads-item figure{margin:0;text-align:center}
.ads-item img{width:65px;height:65px;object-fit:cover;border-radius:10px}
.link-strip{display:flex;flex-wrap:wrap;gap:.6rem;padding:1.25rem 0}
.link-strip a{padding:.45rem 1rem;border:1px solid var(--accent);border-radius:999px;color:var(--accent);font-size:.9rem;font-weight:500;text-decoration:none}
.link-strip a:hover{background:var(--accent);color:#fff}
.lead{color:var(--muted);font-size:1.05rem;margin:0 0 1rem}
.content-fig{margin:1rem 0}
.content-fig img{border-radius:10px;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.content-fig figcaption{font-size:.78rem;color:var(--muted);text-align:center;margin-top:.4rem}
.related-read{margin:2rem 0;padding:1.5rem;background:#f9fafb;border-radius:12px;border:1px solid var(--line)}
.related-read h2{margin:0 0 1rem;font-size:1.1rem}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:.5rem}
.related-grid a{padding:.5rem;background:#fff;border:1px solid var(--line);border-radius:8px;font-size:.88rem;text-align:center;text-decoration:none;color:var(--ink)}
.related-grid a:hover{border-color:var(--accent);color:var(--accent)}
.faq-block{margin:2rem 0 3rem}
.faq-item{border:1px solid var(--line);border-radius:8px;margin-bottom:.5rem;padding:.75rem 1rem;background:#fff}
.faq-item summary{cursor:pointer;font-weight:600}
.site-footer{border-top:1px solid var(--line);padding:2rem 0;background:#fafafa;margin-top:2rem}
.footer-links{display:flex;flex-wrap:wrap;gap:1rem;margin-bottom:.75rem}
.footer-links a{color:var(--muted);font-size:.88rem;text-decoration:none}
.page-wrap{padding:2rem 0 3rem}
.page-wrap h1{font-size:1.6rem;margin-bottom:1.25rem}
.prose p{margin-bottom:1rem;text-align:justify}
.prose h2{font-size:1.1rem;margin:1.5rem 0 .75rem}
.error-wrap{padding:4rem 0;text-align:center}
.error-wrap h1{font-size:4rem;color:var(--accent);margin:0 0 1rem}
@media(max-width:768px){
.nav-toggle{display:flex}
.site-nav{position:fixed;inset:64px 0 auto 0;background:#fff;padding:1rem;border-bottom:1px solid var(--line);transform:translateY(-120%);transition:.3s;z-index:99}
.site-nav.is-open{transform:translateY(0)}
.site-nav ul{flex-direction:column}
}

.hero-masonry{padding:1.5rem 0 .5rem}
.hero-masonry h1{font-size:clamp(1.35rem,3vw,1.85rem)}
.masonry-grid{columns:2;column-gap:1.25rem;padding:1rem 0 2.5rem}
.masonry-item{break-inside:avoid;background:#fff;border:1px solid var(--line);border-radius:12px;padding:1.2rem;margin-bottom:1.2rem;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.masonry-item h2{margin:0 0 .5rem;font-size:.98rem;color:var(--accent)}
.masonry-item p{font-size:.93rem;text-align:justify;margin-bottom:.5rem}
@media(max-width:768px){.masonry-grid{columns:1}}