*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--accent:#0369a1;--accent-light:#0ea5e9;--accent-soft:#e0f2fe;--ink:#0c4a6e;--muted:#0369a1;--line:#bae6fd;--bg:#f0f9ff;--max:880px}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.82;font-size:16px;min-height:100vh}
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:100;box-shadow:0 1px 8px rgba(3,105,161,.06)}
.header-row{display:flex;align-items:center;justify-content:space-between;min-height:58px;gap:1rem;position:relative}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--ink);font-size:.95rem;font-weight:600;text-decoration:none}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:1px solid var(--line);border-radius:6px;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(--accent)}
.site-nav ul{display:flex;gap:1.25rem;list-style:none;flex-wrap:wrap}
.site-nav a{color:#64748b;font-size:.9rem;text-decoration:none}
.site-nav a.active,.site-nav a:hover{color:var(--accent)}
.ads-top-bar{background:#fff;border-bottom:1px solid var(--line);padding:.5rem 0}
.applist-title{font-size:.8rem;color:#64748b;margin-bottom:.35rem;text-align:center}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem}
.gradient-strip{width:100%;padding:2.5rem 0;border-bottom:1px solid rgba(186,230,253,.5)}
.hero-strip{padding:2.75rem 0 2rem}
.hero-title{font-size:clamp(1.35rem,3.2vw,1.9rem);font-weight:700;line-height:1.38;margin-bottom:1rem;color:var(--accent)}
.hero-lead{font-size:1.02rem;line-height:1.88;color:#0c4a6e;text-align:justify;max-width:780px}
.hero-lead strong{color:var(--ink)}
.strip-title{font-size:clamp(1.1rem,2.6vw,1.4rem);font-weight:700;color:var(--accent);margin-bottom:1.1rem;padding-bottom:.65rem;border-bottom:2px solid rgba(3,105,161,.15)}
.strip-body p{margin-bottom:.85rem;text-align:justify;color:#0c4a6e;font-size:.96rem;line-height:1.85}
.strip-body p:last-child{margin-bottom:0}
.content-fig img{width:100%;max-width:520px;margin:1rem auto;border-radius:10px;box-shadow:0 6px 24px rgba(3,105,161,.1);border:1px solid var(--line)}
.content-fig figcaption{font-size:.76rem;color:#64748b;margin-top:.45rem;text-align:center}
.link-strip{display:flex;flex-wrap:wrap;gap:.7rem;padding:1.35rem 0;background:#fff;border-bottom:1px solid var(--line)}
.link-strip a{padding:.42rem .95rem;border:2px solid var(--accent);border-radius:999px;font-size:.86rem;color:var(--accent);background:#fff;font-weight:500;transition:background .2s,color .2s}
.link-strip a:hover{background:var(--accent);color:#fff;text-decoration:none}
.faq-inner details{border:1px solid var(--line);border-radius:8px;margin-bottom:.55rem;background:rgba(255,255,255,.7);backdrop-filter:blur(4px)}
.faq-inner summary{cursor:pointer;padding:.75rem 1rem;font-weight:600;list-style:none;color:var(--accent);font-size:.92rem}
.faq-inner summary::-webkit-details-marker{display:none}
.faq-inner details[open] summary{border-bottom:1px solid var(--line)}
.faq-inner details p{padding:.75rem 1rem;font-size:.9rem;color:#0c4a6e;line-height:1.78}
.related-read{padding:2rem 0 3rem;background:#fff;border-top:1px solid var(--line)}
.related-read h2{font-size:1rem;margin-bottom:1rem;color:var(--accent);font-weight:700}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(130px,1fr));gap:.65rem}
.related-grid a{display:block;padding:.65rem;border:1px solid var(--line);border-radius:8px;text-align:center;font-size:.85rem;color:var(--ink);text-decoration:none;background:var(--accent-soft)}
.related-grid a:hover{border-color:var(--accent);color:var(--accent)}
.site-footer{border-top:2px solid var(--accent);padding:1.5rem 0 2rem;background:linear-gradient(180deg,#e0f2fe,#f0f9ff)}
.footer-links{display:flex;flex-wrap:wrap;gap:1rem;margin-bottom:.75rem;justify-content:center}
.footer-links a{font-size:.85rem;color:#64748b;text-decoration:none}
.site-footer p{font-size:.8rem;color:#64748b;text-align:center}
.page-head-strip{padding:2rem 0 1.5rem}
.page-title{font-size:1.55rem;color:var(--accent);margin-top:.5rem;font-weight:700}
.breadcrumb{font-size:.85rem;color:#64748b}
.breadcrumb a{color:var(--accent)}
.prose-page{padding:2rem 0 3rem;max-width:720px}
.prose-page h2{font-size:1.1rem;margin:1.5rem 0 .75rem;color:var(--accent)}
.prose-page p{margin-bottom:1rem;text-align:justify;color:#0c4a6e;line-height:1.85}
.error-page{min-height:50vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:2rem}
.error-page h1{font-size:3rem;color:var(--accent);font-weight:700}
@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 4px 12px rgba(3,105,161,.08)}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:.75rem}
  .gradient-strip{padding:1.75rem 0}
}