*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--accent:#dc2626;--accent-soft:#fef2f2;--accent-dark:#991b1b;--ink:#1a1a1a;--muted:#555;--line:#e5e5e5;--max:1080px}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;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}
.brand{display:flex;align-items:center;gap:.65rem;font-weight:600;color:var(--ink)}.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}
.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}
.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}
.hero{padding:2.25rem 0 1.75rem;border-bottom:2px solid var(--accent-soft)}
.hero h1{font-size:clamp(1.45rem,3.2vw,2rem);line-height:1.35;margin-bottom:1rem;color:var(--ink)}
.hero .lead{color:#333;margin-bottom:.85rem;text-align:justify}
.hero .lead:last-of-type{margin-bottom:0}
.kw-intro strong{font-weight:600;color:var(--accent-dark)}
.link-strip{display:flex;flex-wrap:wrap;gap:.65rem;padding:1.25rem 0 1.75rem;border-bottom:1px solid var(--line)}
.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)}
.checker-wrap{padding:0 0 2.5rem}
.checkerboard{display:grid;grid-template-columns:1fr 1fr;gap:0;border:1px solid var(--line);border-radius:16px;overflow:hidden;box-shadow:0 8px 32px rgba(220,38,38,.06)}
.checker-tile{padding:1.75rem 1.65rem;border:1px solid var(--line);min-height:220px}
.checker-tile:nth-child(4n+1),.checker-tile:nth-child(4n+4){background:#fff}
.checker-tile:nth-child(4n+2),.checker-tile:nth-child(4n+3){background:var(--accent-soft)}
.checker-tile h2{font-size:1.08rem;color:var(--accent);margin-bottom:.7rem;line-height:1.4}
.checker-tile p{margin-bottom:.8rem;text-align:justify;color:#333;font-size:.96rem}
.checker-tile p:last-child{margin-bottom:0}
.checker-tile figure{margin:1rem 0 0}
.checker-tile figure img{max-width:min(100%,480px);border-radius:10px;margin:0 auto;border:1px solid var(--line)}
.checker-tile figcaption{font-size:.76rem;color:var(--muted);text-align:center;margin-top:.35rem}
.checker-tile.span-full{grid-column:1/-1;background:linear-gradient(135deg,var(--accent-soft),#fff);border-top:3px solid var(--accent)}
.callout{background:#fff;border-left:4px solid var(--accent);padding:.85rem 1rem;border-radius:0 8px 8px 0;margin:.85rem 0;font-size:.92rem;box-shadow:0 2px 8px rgba(0,0,0,.04)}
.note-tag{display:inline-block;font-size:.72rem;font-weight:600;color:var(--accent);background:var(--accent-soft);padding:.15rem .55rem;border-radius:4px;margin-bottom:.5rem}
.faq-block{padding:0 0 2.5rem}.faq-block h2{font-size:1.25rem;margin-bottom:1rem;color:var(--ink)}
.faq-block details{border:1px solid var(--line);border-radius:12px;padding:1rem 1.15rem;margin-bottom:.75rem;background:#fff}
.faq-block summary{cursor:pointer;font-weight:600;color:var(--ink)}
.faq-block p{margin-top:.65rem;color:#444;font-size:.95rem}
.related-read{margin:2rem 0 3rem;padding:1.5rem 1.75rem;border:1px solid var(--line);border-radius:14px;background:#fafafa}
.related-read h2{font-size:1.1rem;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)}
.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}
  .checkerboard{grid-template-columns:1fr;border-radius:12px}
  .checker-tile.span-full{grid-column:1}
}