.reference-index{max-width:1120px;margin:auto;padding:36px 28px 0}
.reference-index h1,.reference-main h1{margin-bottom:20px}
.reference-intro{max-width:680px;color:var(--muted)}
.reference-search{align-items:center;gap:10px;margin:0 0 12px;max-width:680px;padding:6px;border:1px solid var(--border);background:var(--sidebar-surface);border-radius:12px}
.reference-search input{flex:1;min-width:0;padding:10px 12px;border:0;border-radius:7px;background:var(--lesson-surface);color:var(--text);font-size:16px}
.reference-search button{padding:8px 12px;font-size:13px}
.reference-search-status{font-size:13px;color:var(--muted);margin:0 0 24px;min-height:20px}
.reference-empty{padding:24px;border:1px solid var(--border);border-radius:12px;color:var(--muted)}
.reference-language-grid{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;margin:24px 0 40px}
.reference-language-card{display:flex;align-items:center;gap:16px;padding:20px;text-decoration:none;border:1px solid var(--border);border-radius:14px;background:var(--lesson-surface);color:var(--text)}
.reference-language-card:hover{border-color:var(--accent);background:var(--accent-soft)}
.reference-language-card h2{font-size:19px;margin:0 0 6px}.reference-language-card p{font-size:13px;color:var(--muted);margin:0}.reference-language-card>span:last-child{margin-left:auto;color:var(--accent)}
.reference-language-symbol{display:grid;place-items:center;width:42px;height:42px;flex:0 0 42px;border-radius:10px;background:var(--accent-soft);color:var(--accent);font-family:monospace;font-size:18px;font-weight:700}
.cheatsheet-reference .course-sidebar{padding-bottom:24px}
.reference-language-switch{padding:20px 0;flex-shrink:0}.reference-language-switch label{display:block;font-size:12px;color:var(--muted);margin-bottom:7px}.reference-language-switch select{width:100%}
.reference-topic-nav{display:flex;flex-direction:column;gap:3px;min-height:0;overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;flex:1}.reference-topic-nav a{padding:9px 12px;font-size:13px;line-height:1.5;border-radius:8px;text-decoration:none;color:var(--muted)}
.reference-topic-nav a:hover,.reference-topic-nav a[aria-current=location]{color:var(--accent);background:var(--accent-soft)}
.cheatsheet-reference .reference-main{padding-bottom:30px}
.reference-content>section{scroll-margin-top:calc(var(--header-height) + 24px);padding:24px 0;border-top:1px solid var(--border)}
.reference-content h2{font-size:25px;color:var(--accent);margin-bottom:18px}.reference-content h3{font-size:19px;margin:20px 0 12px}.reference-content p{margin-bottom:14px}
.reference-content pre{margin:16px 0 22px}.reference-code-actions{display:flex;justify-content:flex-end;margin-top:14px}.reference-code-actions button{font-size:12px;padding:7px 12px}
.reference-code-actions+pre{margin-top:8px}.reference-copy-status{align-self:center;font-size:12px;color:var(--muted);margin-right:12px}
.reference-related{display:flex;flex-wrap:wrap;gap:24px;padding:24px 0;border-top:1px solid var(--border);font-weight:650}
.reference-footer{max-width:1120px;margin:auto;padding:0 clamp(20px,5vw,80px)}
.cheatsheet-reference .site-footer{margin-top:20px}
@media(max-width:900px){.reference-language-grid{grid-template-columns:repeat(2,minmax(0,1fr))}}
@media(max-width:650px){.reference-index{padding:28px 14px 0}.reference-language-grid{grid-template-columns:1fr;gap:10px}.reference-language-card{padding:16px}.reference-footer{padding:0 14px}.reference-content h2{font-size:23px}.reference-language-switch select{font-size:16px}}

.reference-language-symbol{background:#f4f7f5}
.reference-language-symbol img{display:block;width:32px;height:32px;object-fit:contain}