*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{
  --ink:#1a1a1a;--muted:#555;--line:#e8e8e8;--accent:#c0392b;
  --quote-bg:#fafafa;--max:680px;--header-h:56px;
}
html{scroll-behavior:smooth}
body{font-family:"Noto Sans SC",system-ui,sans-serif;color:var(--ink);background:#fff;line-height:1.75;font-size:16px}
img{max-width:100%;height:auto;display:block}
a{color:var(--accent);text-decoration:none}
a:hover{text-decoration:underline}

.site-header{position:sticky;top:0;z-index:100;background:#fff;border-bottom:1px solid var(--line)}
.header-inner{max-width:960px;margin:0 auto;padding:0 1rem;display:flex;align-items:center;justify-content:space-between;min-height:var(--header-h)}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--ink);font-size:.9rem;text-decoration:none}
.brand:hover{text-decoration:none}
.brand em{font-style:normal;font-weight:700;color:var(--accent)}
.brand span{line-height:1.3}

.nav-toggle{display:none;background:none;border:none;cursor:pointer;padding:.5rem;flex-direction:column;gap:5px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink);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)}

.site-nav ul{display:flex;gap:1.2rem;list-style:none}
.site-nav a{color:var(--muted);font-size:.88rem;text-decoration:none}
.site-nav a:hover,.site-nav a.active{color:var(--accent)}

.ads-top-bar{background:#f9f9f9;border-bottom:1px solid var(--line);padding:.5rem 0}
#applist{display:flex;align-items:center;gap:1rem;flex-wrap:wrap}
.applist-title{font-size:.78rem;color:var(--muted);white-space:nowrap}
#ads{display:flex;gap:.75rem;flex-wrap:wrap}
.ads-item figure{margin:0;text-align:center}
.ads-item img{border-radius:8px}
.ads-item .caption{font-size:.68rem;color:var(--muted);margin-top:.2rem;max-width:65px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap}

.column-wrap{max-width:var(--max);margin:0 auto;padding:2rem 1.25rem 3rem}

.hero-block{margin-bottom:2.5rem;padding-bottom:2rem;border-bottom:1px solid var(--line)}
.hero-tag{display:inline-block;font-size:.78rem;font-weight:500;color:var(--accent);border:1px solid var(--accent);padding:.15rem .65rem;border-radius:999px;margin-bottom:1rem;letter-spacing:.02em}
.hero-block h1{font-size:1.65rem;line-height:1.35;font-weight:700;margin-bottom:1rem}
.hero-lead{font-size:1.02rem;color:var(--muted)}

.toc-strip{display:flex;flex-wrap:wrap;gap:.5rem;margin:1.5rem 0 2rem;padding:0;list-style:none}
.toc-strip a{font-size:.82rem;color:var(--muted);background:#f5f5f5;padding:.3rem .75rem;border-radius:4px;text-decoration:none}
.toc-strip a:hover{background:#eee;color:var(--accent);text-decoration:none}

.article-section{margin-bottom:2.5rem}
.article-section h2{font-size:1.25rem;font-weight:700;margin-bottom:1rem;padding-bottom:.4rem;border-bottom:2px solid var(--accent);display:inline-block}
.article-section p{margin-bottom:1rem;text-align:justify}
.article-section figure{margin:1.5rem 0}
.article-section figcaption{font-size:.82rem;color:var(--muted);margin-top:.4rem;text-align:center}

.pull-quote{margin:1.75rem 0;padding:1.25rem 1.5rem;background:var(--quote-bg);border-left:4px solid var(--accent);font-size:1.05rem;font-weight:500;line-height:1.6;color:#333}
.pull-quote cite{display:block;margin-top:.6rem;font-size:.82rem;font-weight:400;color:var(--muted);font-style:normal}

.tip-line{background:#fff8f0;border:1px solid #ffe0b2;padding:.85rem 1rem;border-radius:6px;font-size:.92rem;margin:1.25rem 0}

.faq-block{margin-top:3rem;padding-top:2rem;border-top:2px solid var(--line)}
.faq-block>h2{font-size:1.25rem;margin-bottom:1.25rem}
.faq-item{border:1px solid var(--line);border-radius:8px;margin-bottom:.65rem;overflow:hidden;background:#fff}
.faq-q{width:100%;display:flex;align-items:center;justify-content:space-between;gap:1rem;padding:1rem 1.15rem;background:#fff;border:none;cursor:pointer;font:inherit;font-weight:600;text-align:left;color:var(--ink)}
.faq-q:hover{background:#fafafa}
.faq-q .icon{font-size:1.2rem;color:var(--accent);transition:transform .2s;flex-shrink:0}
.faq-item.is-open .faq-q .icon{transform:rotate(45deg)}
.faq-a{display:none;padding:0 1.15rem 1rem;color:var(--muted);font-size:.95rem}
.faq-item.is-open .faq-a{display:block}

.read-links{display:flex;flex-wrap:wrap;gap:1rem;margin-top:2rem;padding-top:1.5rem;border-top:1px solid var(--line)}
.read-links a{font-size:.88rem;color:var(--muted)}

.prose-page{max-width:var(--max);margin:0 auto;padding:2rem 1.25rem 3rem}
.prose-page h1{font-size:1.5rem;margin-bottom:1rem}
.prose-page h2{font-size:1.1rem;margin:1.5rem 0 .75rem}
.prose-page p{margin-bottom:1rem}

.error-page{max-width:var(--max);margin:4rem auto;padding:2rem 1.25rem;text-align:center}
.error-page h1{font-size:3rem;color:var(--accent);margin-bottom:.5rem}

.site-footer{background:#fafafa;border-top:1px solid var(--line);padding:1.5rem 1rem;text-align:center;font-size:.82rem;color:var(--muted)}
.footer-links{display:flex;flex-wrap:wrap;justify-content:center;gap:1rem;margin-bottom:.75rem}
.footer-links a{color:var(--muted);text-decoration:none}
.footer-links a:hover{color:var(--accent)}

@media(max-width:720px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:var(--header-h);left:0;right:0;background:#fff;border-bottom:1px solid var(--line);display:none;padding:1rem}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:.75rem}
  .site-header{position:relative}
  .hero-block h1{font-size:1.35rem}
}