*,*::before,*::after{box-sizing:border-box;margin:0;padding:0}
:root{--accent:#0d9488;--ink:#1a1a1a;--muted:#5c5c5c;--line:#e8e8e8;--bg:#fff;--max:960px;--soft:#0d948818}
html{scroll-behavior:smooth;scroll-padding-top:72px}
body{font-family:"Noto Sans SC",system-ui,sans-serif;background:var(--bg);color:var(--ink);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}
.container{max-width:var(--max);margin:0 auto;padding:0 1.25rem}
.site-header{border-bottom:1px solid var(--line);background:#fff;position:sticky;top:0;z-index:100}
.header-row{display:flex;align-items:center;justify-content:space-between;min-height:58px;gap:1rem}
.brand{display:flex;align-items:center;gap:.6rem;color:var(--ink);font-size:.95rem;text-decoration:none}
.brand b{color:var(--accent);font-weight:700}
.nav-toggle{display:none;flex-direction:column;gap:5px;background:none;border:none;cursor:pointer;padding:6px}
.nav-toggle span{display:block;width:22px;height:2px;background:var(--ink)}
.site-nav ul{display:flex;gap:1.25rem;list-style:none;flex-wrap:wrap}
.site-nav a{color:var(--muted);font-size:.9rem;text-decoration:none}
.site-nav a.active,.site-nav a:hover{color:var(--accent)}
.ads-top-bar{background:#fafafa;border-bottom:1px solid var(--line);padding:.5rem 0}
.applist-title{font-size:.8rem;color:var(--muted);margin-bottom:.35rem;text-align:center}
#ads{display:flex;justify-content:center;flex-wrap:wrap;gap:.5rem}
.hero-figure img{width:100%;max-width:480px;margin:0 auto;border-radius:10px;box-shadow:0 8px 28px rgba(0,0,0,.08)}
.hero-figure figcaption,.content-fig figcaption{font-size:.78rem;color:var(--muted);margin-top:.5rem;text-align:center}
.content-fig img{width:100%;max-width:560px;margin:1rem auto;border-radius:8px;box-shadow:0 4px 16px rgba(0,0,0,.06)}
.link-strip{display:flex;flex-wrap:wrap;gap:.75rem;padding:1rem 0;border-bottom:1px solid var(--line);margin-bottom:1.5rem}
.link-strip a{padding:.35rem .85rem;border:1px solid var(--line);border-radius:999px;font-size:.85rem;color:var(--ink);background:#fafafa}
.link-strip a:hover{border-color:var(--accent);color:var(--accent);text-decoration:none}
.masthead,.hero-block,.hero-dash,.hero-split,.hero-scroll,.hero-tree{padding:2rem 0 1rem}
.masthead h1,.hero-block h1,.hero-dash h1,.hero-split h1,.hero-scroll h1,.hero-tree h1{font-size:clamp(1.35rem,3vw,1.75rem);line-height:1.35;margin-bottom:1rem}
.lead{color:var(--muted);font-size:1.02rem;margin-bottom:.75rem}
.lead strong{color:var(--ink)}
.tagline{font-size:.85rem;color:var(--muted)}
section p,.wizard-step p,.dash-card p,.split-main p,.hscroll-card p,.tree-inner p{margin-bottom:.85rem;text-align:justify;color:#333}
section h2,.wizard-step h2,.dash-card h2,.split-main h2,.hscroll-card h2,.tree-inner h2{font-size:1.2rem;margin-bottom:.85rem;color:var(--ink)}
.faq{margin:2rem 0;padding-top:1.5rem;border-top:1px solid var(--line)}
.faq details{border:1px solid var(--line);border-radius:6px;margin-bottom:.5rem}
.faq summary{cursor:pointer;padding:.75rem 1rem;font-weight:600;list-style:none}
.faq summary::-webkit-details-marker{display:none}
.faq details[open] summary{border-bottom:1px solid var(--line)}
.faq details p{padding:.75rem 1rem;font-size:.92rem;color:var(--muted)}
.related-read{padding:2rem 0 3rem;border-top:1px solid var(--line)}
.related-read h2{font-size:1rem;margin-bottom:1rem}
.related-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(140px,1fr));gap:.75rem}
.related-grid a{display:block;padding:.65rem;border:1px solid var(--line);border-radius:6px;text-align:center;font-size:.88rem;color:var(--ink);text-decoration:none}
.related-grid a:hover{border-color:var(--accent);color:var(--accent)}
.site-footer{border-top:1px solid var(--line);padding:1.5rem 0 2rem;background:#fafafa}
.footer-links{display:flex;flex-wrap:wrap;gap:1rem;margin-bottom:.75rem}
.footer-links a{font-size:.85rem;color:var(--muted);text-decoration:none}
.site-footer p{font-size:.8rem;color:var(--muted)}
.page-head{padding:2rem 0 1rem}
.page-head h1{font-size:1.6rem}
.prose-page{padding-bottom:3rem;max-width:720px}
.prose-page h2{font-size:1.15rem;margin:1.5rem 0 .75rem}
.prose-page p{margin-bottom:1rem;text-align:justify;color:#333}
.error-page{min-height:55vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:2rem}
.error-page h1{font-size:3rem;color:var(--accent)}
@media(max-width:768px){
  .nav-toggle{display:flex}
  .site-nav{position:absolute;top:58px;left:0;right:0;background:#fff;border-bottom:1px solid var(--line);padding:1rem;display:none}
  .site-nav.is-open{display:block}
  .site-nav ul{flex-direction:column;gap:.75rem}
  .header-row{position:relative;flex-wrap:wrap}
}

.tree-root{position:relative;padding:1.5rem 0 2.5rem 1.5rem}
.tree-trunk{position:absolute;left:1.75rem;top:0;bottom:2rem;width:2px;background:var(--line)}
.tree-node{margin-bottom:.75rem;margin-left:1.5rem;border:1px solid var(--line);border-radius:10px;overflow:hidden;background:#fff}
.tree-toggle{width:100%;display:flex;align-items:center;gap:.65rem;padding:.85rem 1rem;border:none;background:#fafafa;cursor:pointer;text-align:left;font:inherit}
.tree-toggle h2{font-size:1rem;margin:0;color:var(--ink)}
.tree-icon{color:var(--accent);font-size:.75rem;width:1rem}
.tree-body{max-height:0;overflow:hidden;transition:max-height .35s ease}
.tree-node.is-open .tree-body{max-height:3000px}
.tree-inner{padding:0 1rem 1rem}