*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:#fff;color:#1a1a1a;line-height:1.75;font-size:16px}
a{color:#1565c0;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}
.container{max-width:880px;margin:0 auto;padding:0 20px}

.site-header{background:#fff;border-bottom:1px solid #e8e8e8;position:sticky;top:0;z-index:100}
.header-row{display:flex;align-items:center;justify-content:space-between;padding:14px 0}
.brand{display:flex;align-items:center;gap:10px;font-size:1.05rem;color:#1a1a1a;font-weight:500}
.brand:hover{text-decoration:none}
.brand b{color:#c62828;font-weight:700}
.site-nav ul{display:flex;gap:6px 18px;list-style:none;flex-wrap:wrap}
.site-nav a{color:#444;font-size:.92rem;padding:4px 0}
.site-nav a.active{color:#c62828;font-weight:600;border-bottom:2px solid #c62828}
.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:8px;flex-direction:column;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:#333;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{background:#fafafa;border-bottom:1px solid #eee;padding:10px 0}
.applist-title{font-size:.78rem;color:#888;text-align:center;margin-bottom:6px;letter-spacing:.05em}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:12px}
#ads .caption{font-size:.7rem;color:#666;margin-top:4px;text-align:center;max-width:70px;line-height:1.3}

.hero-checklist{padding:36px 0 20px}
.hero-checklist h1{font-size:1.65rem;line-height:1.35;margin-bottom:16px;color:#111}
.hero-checklist .lead{color:#444;margin-bottom:12px;font-size:1.02rem}

.ladder{display:flex;flex-direction:column;gap:0;padding:20px 0 40px}
.ladder-step{display:grid;grid-template-columns:56px 1fr;gap:16px;padding:28px 0;border-bottom:1px dashed #e0e0e0}
.ladder-step:last-child{border-bottom:none}
.step-num{width:48px;height:48px;border-radius:50%;background:#fff;border:3px solid #c62828;color:#c62828;font-weight:700;font-size:1.2rem;display:flex;align-items:center;justify-content:center;flex-shrink:0}
.ladder-step h2{font-size:1.15rem;margin-bottom:10px;color:#222}
.ladder-step p{margin-bottom:10px;color:#333}
.ladder-step figure{margin:16px 0}
.ladder-step figcaption{font-size:.85rem;color:#777;margin-top:6px}
.callout{background:#fff8f8;border-left:4px solid #c62828;padding:14px 18px;margin:14px 0;font-size:.95rem;color:#444}

.site-footer{background:#fafafa;border-top:1px solid #eee;padding:28px 0;margin-top:20px;text-align:center;font-size:.88rem;color:#666}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:8px 16px;margin-bottom:10px}
.footer-links a{color:#555}

.prose-page{padding:32px 0 48px}
.prose-page h1{font-size:1.5rem;margin-bottom:16px}
.prose-page h2{font-size:1.15rem;margin:24px 0 10px;color:#222}
.prose-page p{margin-bottom:12px;color:#333}
.error-page{text-align:center;padding:48px 0 24px}
.error-page h1{font-size:3rem;color:#c62828}

@media(max-width:768px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:100%;left:0;right:0;background:#fff;border-bottom:1px solid #eee;padding:12px 20px;display:none;box-shadow:0 4px 12px rgba(0,0,0,.06)}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:0}
  .site-nav li{border-bottom:1px solid #f0f0f0}
  .site-nav a{display:block;padding:12px 0}
  .header-row{position:relative}
  .hero-checklist h1{font-size:1.35rem}
  .ladder-step{grid-template-columns:44px 1fr;gap:12px}
  .step-num{width:40px;height:40px;font-size:1rem}
}