*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--accent:#ea580c;--accent-soft:#ffedd5;--ink:#1a1a1a;--muted:#555;--line:#e8e8e8;--bg:#fff;--max:920px}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:var(--bg);color:var(--ink);line-height:1.85;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,var(--max));margin-inline:auto}
.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line);box-shadow:0 1px 0 rgba(0,0,0,.04)}
.header-row{display:flex;align-items:center;justify-content:space-between;min-height:64px;gap:1rem}
.brand{display:flex;align-items:center;gap:.65rem;font-weight:600;color:var(--ink);text-decoration:none}
.brand img{border-radius:10px}
.brand b{color:var(--accent);font-weight:700}
.site-nav ul{display:flex;gap:1.1rem;list-style:none}
.site-nav a{color:var(--muted);font-size:.95rem;text-decoration:none}
.site-nav a.active,.site-nav a:hover{color:var(--accent)}
.nav-toggle{display:none;border:1px solid var(--line);width:42px;height:42px;border-radius:10px;cursor:pointer;flex-direction:column;justify-content:center;align-items:center;gap:5px;background:#fff;padding:6px}
.nav-toggle span{width:22px;height:2px;background:var(--ink);display:block;transition:transform .2s,opacity .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{border-bottom:1px solid var(--line);background:#fff;padding:.55rem 0}
.applist-title{font-size:.78rem;color:var(--muted);text-align:center;margin-bottom:.35rem}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem}
.acc-wrap{padding:1.75rem 0 2rem}
.acc-intro{margin-bottom:1.5rem}
.acc-intro h1{font-size:clamp(1.4rem,3vw,1.85rem);line-height:1.35;margin-bottom:1rem;color:var(--ink)}
.lead{color:#333;margin-bottom:.85rem;text-align:justify;font-size:1.02rem}
.kw-intro strong{font-weight:600;color:var(--ink)}
.link-strip{display:flex;flex-wrap:wrap;gap:.75rem;padding:1rem 0 1.5rem;border-bottom:1px solid var(--line);margin-bottom:.5rem}
.link-strip a{padding:.45rem .95rem;border:1px solid var(--line);border-radius:999px;font-size:.88rem;color:var(--ink);background:#fff;text-decoration:none}
.link-strip a:hover{border-color:var(--accent);color:var(--accent)}
.acc-item{border:1px solid var(--line);border-radius:12px;margin-bottom:.75rem;overflow:hidden;background:#fff}
.acc-item summary{padding:1rem 1.2rem;font-weight:600;cursor:pointer;background:var(--accent-soft);list-style:none;color:var(--ink)}
.acc-item summary::-webkit-details-marker{display:none}
.acc-item[open] summary{border-bottom:1px solid var(--line);color:var(--accent)}
.acc-body{padding:1.15rem 1.25rem}
.acc-body p{text-align:justify;margin-bottom:.85rem;color:#333;font-size:.97rem}
.acc-body p:last-child{margin-bottom:0}
.content-fig{margin:1.15rem 0}
.content-fig img{width:100%;max-width:560px;margin:0 auto;border-radius:10px;box-shadow:0 4px 16px rgba(234,88,12,.08)}
.content-fig figcaption{font-size:.78rem;color:var(--muted);text-align:center;margin-top:.45rem}
.callout{background:var(--accent-soft);border-left:4px solid var(--accent);padding:1rem 1.15rem;border-radius:0 10px 10px 0;margin:1rem 0;font-size:.95rem}
.faq{padding:0 0 2.5rem}
.faq h2{font-size:1.2rem;margin-bottom:1rem;color:var(--ink)}
.faq details{border:1px solid var(--line);border-radius:12px;margin-bottom:.65rem;background:#fff}
.faq summary{cursor:pointer;padding:.85rem 1.1rem;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq details[open] summary{border-bottom:1px solid var(--line);color:var(--accent)}
.faq details p{padding:.85rem 1.1rem;font-size:.94rem;color:#444}
.related-read{padding:2rem 0 3rem;border-top:1px solid var(--line)}
.related-read h2{font-size:1.05rem;margin-bottom:1rem}
.related-grid{display:flex;flex-wrap:wrap;gap:.75rem}
.related-grid a{padding:.45rem .9rem;border:1px solid var(--line);border-radius:8px;font-size:.88rem;color:var(--ink);background:#fff;text-decoration:none}
.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:.86rem;color:var(--muted);margin-bottom:.5rem}
.prose-page{padding:2rem 0 3rem}
.prose-page h2{color:var(--accent);margin:1.75rem 0 1rem;font-size:1.15rem}
.prose-page p,.prose-page li{margin-bottom:1rem;text-align:justify;color:#333}
.prose-page ul{padding-left:1.25rem}
.site-footer{border-top:1px solid var(--line);padding:2rem 0;text-align:center;color:var(--muted);font-size:.88rem;background:#fff}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;margin-bottom:.75rem}
.footer-links a{color:var(--muted);text-decoration:none}
.error-page{min-height:60vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:3rem 0}
.error-page h1{font-size:4rem;color:var(--accent);margin-bottom:.5rem}
@media(max-width:768px){
  .nav-toggle{display:flex}
  .site-nav{display:none;position:absolute;top:64px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:1rem 1.25rem;box-shadow:0 8px 24px rgba(0,0,0,.06)}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:.75rem}
}