*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--accent:#2563eb;--accent-light:#eff6ff;--ink:#1e293b;--muted:#64748b;--line:#e2e8f0;--bg:#fff;--max:1080px}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.78;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}a:hover{text-decoration:underline}
.container{max-width:var(--max);margin:0 auto;padding:0 1.25rem}
.site-header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:200}
.header-row{display:flex;align-items:center;justify-content:space-between;min-height:60px;gap:1rem}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--ink);font-weight:600;font-size:.95rem;text-decoration:none}
.brand b{color:var(--accent);font-weight:700}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:#fff;border:1px solid var(--line);border-radius:8px;cursor:pointer;padding:8px;width:40px;height:40px;justify-content:center;align-items:center}
.nav-toggle span{display:block;width:20px;height:2px;background:var(--ink);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)}
.site-nav ul{display:flex;gap:1.1rem;list-style:none}
.site-nav a{color:var(--muted);font-size:.9rem;text-decoration:none}
.site-nav a.active,.site-nav a:hover{color:var(--accent)}
.ads-top-bar{background:#f8fafc;border-bottom:1px solid var(--line);padding:.5rem 0}
#applist{text-align:center}.applist-title{font-size:.78rem;color:var(--muted);margin-bottom:.35rem}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:.45rem}
.hero{padding:2rem 0 1.25rem;text-align:center;max-width:720px;margin:0 auto}
.hero h1{font-size:clamp(1.4rem,3vw,1.9rem);line-height:1.35;margin-bottom:.85rem;color:var(--ink)}
.lead{color:var(--muted);font-size:1rem;margin-bottom:.75rem;text-align:justify}
.link-strip{display:flex;flex-wrap:wrap;justify-content:center;gap:.65rem;padding:1rem 0 1.5rem;border-bottom:1px solid var(--line);margin-bottom:.5rem}
.link-strip a{padding:.4rem .9rem;border:1px solid var(--line);border-radius:999px;font-size:.84rem;color:var(--ink);background:var(--accent-light);text-decoration:none}
.link-strip a:hover{border-color:var(--accent);color:var(--accent)}
.card-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(260px,1fr));gap:1.15rem;padding:1.5rem 0 2.5rem}
.card{background:#fff;border:1px solid var(--line);border-radius:12px;padding:1.15rem;box-shadow:0 2px 10px rgba(0,0,0,.03);transition:border-color .2s,box-shadow .2s}
.card:hover{border-color:color-mix(in srgb,var(--accent) 40%,#fff);box-shadow:0 4px 16px rgba(37,99,235,.08)}
.card h2{font-size:1rem;color:var(--accent);margin-bottom:.55rem}
.card p{font-size:.9rem;color:#334155;text-align:justify;margin-bottom:.45rem}
.card-hero{grid-column:1/-1;display:grid;grid-template-columns:1fr 1fr;gap:1.25rem;align-items:center;background:linear-gradient(120deg,var(--accent-light),#fff)}
.card-accent{border-left:4px solid var(--accent);background:var(--accent-light)}
.content-fig{margin:.85rem 0;border-radius:10px;overflow:hidden;border:1px solid var(--line)}
.content-fig img{width:100%;max-width:560px;margin:0 auto}
.content-fig figcaption{font-size:.74rem;color:var(--muted);text-align:center;padding:.4rem;background:#f8fafc}
.callout{background:var(--accent-light);border-left:4px solid var(--accent);padding:.85rem 1rem;border-radius:0 10px 10px 0;margin:.85rem 0;font-size:.9rem}
.faq{padding:1.5rem 0 2.5rem;border-top:1px solid var(--line)}
.faq h2{font-size:1.1rem;margin-bottom:1rem;color:var(--accent)}
.faq details{border:1px solid var(--line);border-radius:10px;margin-bottom:.55rem;background:#fff}
.faq summary{cursor:pointer;padding:.85rem 1rem;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq details p{padding:.75rem 1rem;font-size:.9rem;color:var(--muted)}
.related-read{padding:1.5rem 0 2.5rem;border-top:1px solid var(--line)}
.related-read h2{font-size:1rem;margin-bottom:.85rem}
.related-grid{display:flex;flex-wrap:wrap;gap:.55rem}
.related-grid a{padding:.4rem .85rem;border:1px solid var(--line);border-radius:8px;font-size:.86rem;color:var(--ink);text-decoration:none;background:#fff}
.related-grid a:hover{border-color:var(--accent);color:var(--accent)}
.page-head{padding:2rem 0 1rem;border-bottom:1px solid var(--line)}
.breadcrumb{font-size:.84rem;color:var(--muted);margin-bottom:.4rem}
.prose-page{padding:2rem 0 3rem;max-width:720px}
.prose-page h2{font-size:1.1rem;color:var(--accent);margin:1.3rem 0 .75rem}
.prose-page p{margin-bottom:.9rem;text-align:justify;color:#334155}
.site-footer{border-top:1px solid var(--line);padding:1.5rem 0 2rem;background:#f8fafc;text-align:center}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;margin-bottom:.6rem}
.footer-links a{font-size:.85rem;color:var(--muted);text-decoration:none}
.footer-links a:hover{color:var(--accent)}
.site-footer p{font-size:.82rem;color:var(--muted)}
.error-page{min-height:50vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:2rem}
.error-page h1{font-size:3.5rem;color:var(--accent)}
@media(max-width:900px){.card-hero{grid-template-columns:1fr}}
@media(max-width:768px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:1rem;display:none;box-shadow:0 8px 24px rgba(0,0,0,.06)}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:.75rem}
}