/* Homepage heading hierarchy: one H1, seven H2, three H3 in the full DOM. */
.intro>div{min-width:0}.intro h1{max-width:820px;text-wrap:pretty}
.book-title{font-size:16px;font-weight:600;line-height:1.35;margin:12px 0 5px;min-height:46px}
.install-intro .install-title{font-size:24px;line-height:1.35;overflow-wrap:anywhere;font-weight:600;margin:0}
.install-help .help-title{font-size:24px;line-height:1.35;font-weight:600;color:var(--ink);margin:0 20px 0 0}
.install-help .help-platform{color:var(--gold);font-size:18px;font-weight:600;margin-top:22px}
.reading-guide{margin-block:10px 40px;scroll-margin-top:20px}
.reading-guide details{border:1px solid var(--line);border-radius:10px;background:linear-gradient(130deg,var(--panel),var(--bg));overflow:hidden}
.reading-guide summary{list-style:none;cursor:pointer;min-height:90px;padding:20px;display:flex;align-items:center;justify-content:space-between;gap:15px;touch-action:manipulation}
.reading-guide summary::-webkit-details-marker{display:none}.reading-guide summary::marker{content:""}
.reading-guide summary:focus-visible{outline:3px solid var(--gold);outline-offset:-4px}
.reading-guide summary .eyebrow{display:block;font-size:13px;margin-bottom:5px}.guide-title{display:block;font-size:19px;font-weight:600;line-height:1.5}
.guide-toggle{display:flex;align-items:center;gap:9px;flex-shrink:0;font-size:14px;color:var(--gold);min-height:44px}.guide-toggle svg{width:20px;height:20px;transition:transform .18s}
.when-open{display:none}.reading-guide details[open] .when-closed{display:none}.reading-guide details[open] .when-open{display:inline}.reading-guide details[open] .guide-toggle svg{transform:rotate(180deg)}
.reading-guide details[open] summary{border-bottom:1px solid var(--line)}
.guide-content{max-width:800px;margin:auto;padding:22px 20px 30px;overflow-wrap:break-word;font-size:16px;line-height:1.9}
.guide-content>p{color:var(--muted);margin:14px 0}.guide-content .guide-lead{color:var(--ink)}
.guide-content h2{font-size:23px;margin:32px 0 15px;scroll-margin-top:25px}.guide-content h3{font-size:19px;margin:26px 0 12px;color:var(--gold)}
.article-toc{display:flex;flex-wrap:wrap;gap:8px 18px;border-block:1px solid var(--line);padding:12px 0;margin:20px 0}.article-toc a{font-size:14px;color:var(--gold);min-height:44px;display:flex;align-items:center;text-decoration:underline;text-underline-offset:5px}
.guide-links{display:flex;flex-wrap:wrap;gap:14px 22px;align-items:center;border-top:1px solid var(--line);padding-top:24px;margin-top:28px}
@media(max-width:520px){.reading-guide summary{padding:18px 16px;gap:10px;align-items:flex-start}.guide-title{font-size:18px}.guide-toggle{font-size:0;min-width:28px;justify-content:center}.guide-toggle svg{width:24px;height:24px}.guide-content{padding:16px 18px 25px}.guide-content h2{font-size:22px}.guide-links .button{width:100%}.guide-links .text-link{justify-content:center;width:100%}}
@media(min-width:700px){.intro{flex-wrap:wrap}.intro>div{flex:1 1 510px}.intro .searchbox{margin-left:auto}.reading-guide summary{padding:23px 30px}.guide-content{padding-block:28px 40px}.guide-content h2{font-size:26px}}