*,*::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:1.78;font-size:16px}
a{color:#c62828;text-decoration:none}
a:hover{text-decoration:underline}
img{max-width:100%;height:auto;display:block}

.site-header{background:#fff;border-bottom:1px solid #ececec;position:sticky;top:0;z-index:200}
.header-inner{max-width:1140px;margin:0 auto;padding:12px 20px;display:flex;align-items:center;justify-content:space-between;gap:16px}
.brand{display:flex;align-items:center;gap:10px;color:#111;font-weight:600;font-size:1rem}
.brand:hover{text-decoration:none}
.brand img{border-radius:8px}
.brand em{font-style:normal;color:#c62828;font-weight:700}
.site-nav ul{display:flex;flex-wrap:wrap;gap:6px 18px;list-style:none}
.site-nav a{color:#555;font-size:.9rem;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}
#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}

.page-wrap{max-width:1140px;margin:0 auto;padding:28px 20px 52px}

.hero-band{background:linear-gradient(120deg,#fff5f5 0%,#fff 55%);border:1px solid #fde8e8;border-radius:16px;padding:32px 28px;margin-bottom:32px}
.hero-band .tag{display:inline-block;background:#c62828;color:#fff;font-size:.78rem;font-weight:600;padding:5px 14px;border-radius:999px;margin-bottom:14px;letter-spacing:.04em}
.hero-band h1{font-size:1.75rem;line-height:1.35;margin-bottom:14px;color:#111}
.hero-band .lede{color:#444;font-size:1.02rem;margin-bottom:10px}

.chapter-nav{display:flex;flex-wrap:wrap;gap:8px;margin-bottom:28px}
.chapter-nav a{display:inline-block;padding:8px 16px;background:#fafafa;border:1px solid #eee;border-radius:999px;font-size:.86rem;color:#555}
.chapter-nav a:hover{background:#fff0f0;border-color:#ffcdd2;color:#c62828;text-decoration:none}

.card-index{display:grid;grid-template-columns:repeat(3,1fr);gap:14px;margin-bottom:36px}
.index-card{background:#fafafa;border:1px solid #eee;border-radius:12px;padding:18px 16px;text-align:center;transition:.2s}
.index-card:hover{border-color:#ffcdd2;background:#fff8f8}
.index-card .num{font-size:1.6rem;font-weight:700;color:#ef9a9a;line-height:1;margin-bottom:6px}
.index-card .label{font-size:.88rem;color:#444;font-weight:500}
.index-card a{color:inherit;display:block}
.index-card a:hover{text-decoration:none}

.split-section{margin-bottom:40px;padding-bottom:36px;border-bottom:1px solid #f0f0f0}
.split-section:last-of-type{border-bottom:none}
.split-section h2{font-size:1.24rem;margin-bottom:14px;color:#222;display:flex;align-items:center;gap:10px}
.split-section h2 .badge-num{display:inline-flex;align-items:center;justify-content:center;width:32px;height:32px;background:#c62828;color:#fff;font-size:.85rem;font-weight:700;border-radius:8px;flex-shrink:0}
.split-row{display:grid;grid-template-columns:1fr 1fr;gap:28px;align-items:center}
.split-row.reverse .split-text{order:2}
.split-row.reverse .split-media{order:1}
.split-text p{margin-bottom:11px;color:#333}
.split-text ul{margin:10px 0 12px 20px;color:#333}
.split-text li{margin-bottom:6px}
.split-media figure{border-radius:12px;overflow:hidden;border:1px solid #eee;margin:0}
.split-media figcaption{font-size:.84rem;color:#777;padding:8px 12px;background:#fafafa}

.tip-strip{background:#fff8f0;border-left:4px solid #ff9800;padding:14px 18px;margin:16px 0;border-radius:0 8px 8px 0;font-size:.95rem;color:#444}

.faq-block{background:#fafafa;border-radius:12px;padding:22px 24px;margin-top:8px}
.faq-block p{margin-bottom:10px;color:#333}
.faq-block p:last-child{margin-bottom:0}

.read-more{display:flex;flex-wrap:wrap;gap:10px;margin-top:24px}
.read-more a{display:inline-block;padding:8px 14px;background:#fafafa;border:1px solid #e8e8e8;border-radius:999px;font-size:.88rem;color:#555}
.read-more a:hover{background:#fff0f0;border-color:#ffcdd2;color:#c62828;text-decoration:none}

.site-footer{background:#fafafa;border-top:1px solid #eee;padding:28px 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{max-width:780px;margin:0 auto;padding:32px 20px 48px}
.prose-page h1{font-size:1.5rem;margin-bottom:16px}
.prose-page h2{font-size:1.12rem;margin:22px 0 10px}
.prose-page p{margin-bottom:12px;color:#333}
.error-page{text-align:center;padding:60px 20px}
.error-page h1{font-size:3rem;color:#c62828}

@media(max-width:900px){
  .card-index{grid-template-columns:repeat(2,1fr)}
  .split-row{grid-template-columns:1fr}
  .split-row.reverse .split-text,.split-row.reverse .split-media{order:unset}
}
@media(max-width:640px){
  .card-index{grid-template-columns:1fr}
  .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-inner{position:relative;flex-wrap:wrap}
  .hero-band h1{font-size:1.38rem}
}