/* Catalogue-only layout; all colours, typography and page dimensions inherit the lessons. */
.catalog-document{scroll-behavior:auto}
.catalog-page .catalog-brand{font-size:.9rem;font-weight:600;text-decoration:none;letter-spacing:.05em}
.catalog-brand span{font-size:.7rem;font-weight:400;color:var(--muted);margin-left:22px;letter-spacing:.08em}
.mast-note{font-size:.75rem;color:var(--muted);text-decoration:none}
.catalog-hero{padding:48px 0 38px;border-bottom:1px solid var(--line);gap:40px;align-items:center}
.catalog-hero .eyebrow{margin-bottom:14px;font-weight:400}
.catalog-hero h1{margin-bottom:18px}
.title-dot{color:var(--teal)}
.catalog-hero .lead{margin:0;line-height:1.8}
.catalog-stats{display:flex;gap:0;margin:12px 0 0;flex:none}
.catalog-stats>div{min-width:100px;padding:0 22px;border-left:1px solid var(--line);display:flex;flex-direction:column-reverse;gap:6px}
.catalog-stats>div:last-child{padding-right:0}
.catalog-stats dt{font-size:.74rem;color:var(--muted);white-space:nowrap}
.catalog-stats dd{font-size:2.3rem;line-height:1.2;font-weight:400;letter-spacing:-.05em;margin:0;font-variant-numeric:tabular-nums}
.catalog-layout{display:grid;grid-template-columns:222px minmax(0,1fr);gap:46px;padding-top:32px;align-items:start}
.sidebar-sticky{position:sticky;top:24px}
.category-sidebar{align-self:stretch;min-width:0}
.sidebar-label{font-size:.7rem;letter-spacing:.1em;color:var(--muted);margin:0 0 15px}
.category-nav{display:flex;flex-direction:column;gap:3px}
.category-link{display:grid;grid-template-columns:24px 1fr auto;align-items:center;gap:9px;text-decoration:none;padding:11px 12px;font-size:.8rem;border-left:2px solid transparent;line-height:1.5;min-height:44px}
.category-link:hover{background:var(--wash)}
.category-link[aria-current=true]{background:var(--wash);border-left-color:var(--teal);color:var(--teal);font-weight:600}
.category-number,.category-count,.topic-id,.group-number{font-family:Menlo,monospace;font-weight:400;font-variant-numeric:tabular-nums}
.category-number{color:var(--muted);font-size:.65rem}
.category-count{color:var(--muted);font-size:.67rem}
.all-symbol{font-size:1.1rem;line-height:1}
.all-link{margin-bottom:10px}
.sidebar-note{border-top:1px solid var(--line);padding-top:20px;margin:27px 12px 0;font-size:.75rem;color:var(--muted);line-height:1.9}
.catalog-content{min-width:0;scroll-margin-top:24px}
.catalog-tools{display:flex;gap:12px;margin:0 0 22px}
.catalog-search{display:flex;align-items:center;border:1px solid var(--line);padding:0 14px;flex:1;min-width:0;background:var(--white);border-radius:3px;color:var(--muted)}
.catalog-search:focus-within{outline:2px solid var(--teal);outline-offset:2px}
.catalog-search svg{flex:none}
.catalog-search input{width:100%;min-width:0;border:0;padding:12px 10px;background:transparent;font-size:.85rem;outline:none;color:var(--ink);min-height:48px}
.catalog-search input::placeholder{color:var(--muted)}
.catalog-search input:focus-visible{outline:0}
.catalog-search input::-webkit-search-cancel-button{display:none}
.catalog-search .search-clear{background:transparent;border:0;padding:0;min-width:32px;min-height:44px;font-size:1.25rem;color:var(--muted)}
.scope-field{display:flex;align-items:stretch;min-width:0}
.scope-field select{border:1px solid var(--line);background:transparent;padding:9px 28px 9px 12px;font-size:.8rem;color:var(--ink);min-height:48px}
.results-bar{display:flex;align-items:baseline;flex-wrap:wrap;gap:8px 14px;padding:0 0 16px;border-bottom:1px solid var(--line)}
.results-bar h2{font-size:.85rem;line-height:1.6;margin:0;font-weight:600;letter-spacing:0}
.results-bar p{font-size:.73rem;color:var(--muted);margin:0}
.reset-filters{font-size:.73rem;border:0;background:transparent;color:var(--teal);padding:0 0 0 4px;margin-left:auto;min-height:32px}
.topic-group{padding:30px 0 8px;border-bottom:0;scroll-margin-top:20px}
.group-heading{display:flex;align-items:baseline;gap:12px;margin-bottom:13px}
.group-number{font-size:.7rem;color:var(--teal);flex:none}
.group-heading h2{font-size:1.15rem;line-height:1.5;margin:0 0 5px}
.group-heading p{font-size:.77rem;color:var(--muted);margin:0}
.group-count{font-size:.7rem;color:var(--muted);white-space:nowrap;margin-left:auto}
.topic-list{list-style:none;padding:0;margin:0;border-top:1px solid var(--line)}
.topic-row{position:relative;display:grid;grid-template-columns:34px minmax(0,1fr) 116px 16px;gap:12px;align-items:center;padding:19px 0;border-bottom:1px solid var(--line);transition:background-color .15s}
.topic-row:hover{background:var(--wash)}
.topic-id{font-size:.68rem;align-self:start;margin-top:6px;color:var(--muted)}
.topic-title{display:flex;align-items:baseline;gap:8px;flex-wrap:wrap}
.topic-title h3{font-size:.95rem;line-height:1.65;font-weight:500;margin:0;letter-spacing:0}
.topic-link{text-decoration:none}
.topic-link::after{content:"";position:absolute;inset:0}
.topic-link:focus-visible{outline-offset:4px}
.topic-copy p{font-size:.76rem;color:var(--muted);line-height:1.75;margin:5px 0 0}
.extension-label{font-size:.62rem;color:var(--amber);border:1px solid var(--line);padding:0 5px;line-height:1.7;white-space:nowrap}
.topic-resources{display:flex;flex-direction:column;align-items:flex-end;gap:4px;font-size:.68rem;color:var(--muted);white-space:nowrap}
.video-meta{font-variant-numeric:tabular-nums}
.video-meta>span{font-size:.8rem;margin-right:2px;color:var(--teal)}
.offline-link{position:relative;z-index:1;text-decoration:none;color:var(--teal);min-height:28px;display:flex;align-items:center;gap:6px;padding-inline:3px}
.offline-link:hover{text-decoration:underline}
.row-arrow{font-size:.85rem;color:var(--muted);align-self:start;margin-top:4px}
.catalog-end{margin:28px 0 0;font-size:.72rem;color:var(--muted);display:flex;gap:18px;flex-wrap:wrap;justify-content:space-between}
.catalog-end a{white-space:nowrap;text-decoration:none}
.catalog-about{margin-top:58px;padding:28px 0 32px;border-top:1px solid var(--line);display:grid;grid-template-columns:222px minmax(0,1fr);gap:46px}
.catalog-about h2{font-size:1.05rem;line-height:1.7;margin:10px 0 0}
.catalog-about p:not(.eyebrow){margin:0 0 14px;color:var(--muted);font-size:.78rem;line-height:1.9}
.catalog-about a{font-size:.75rem;margin:0 20px 0 0;display:inline-block;min-height:30px}
.catalog-footer{border-top:1px solid var(--line);padding-top:20px;display:flex;justify-content:space-between;gap:16px;font-size:.7rem;color:var(--muted)}
.empty-state{text-align:center;padding:68px 15px 80px}
.empty-state>span{color:var(--muted);font-size:2.5rem;font-family:serif}
.empty-state h2{font-size:1.15rem;margin:10px 0}
.empty-state p{font-size:.85rem;color:var(--muted)}
.empty-reset{font-size:.85rem;background:transparent;color:var(--teal);margin-top:10px}
.sr-only{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip-path:inset(50%);white-space:nowrap;border:0}
.no-script{font-size:.8rem;color:var(--muted)}
@media(min-width:851px){.catalog-page main{min-height:100vh}}
@media(max-width:1050px){.catalog-layout,.catalog-about{grid-template-columns:200px minmax(0,1fr);gap:28px}.catalog-stats>div{min-width:80px;padding-inline:16px}.topic-row{grid-template-columns:30px minmax(0,1fr) 100px;gap:10px}.row-arrow{display:none}}
@media(max-width:850px){.catalog-hero{padding:32px 0;align-items:end}.catalog-stats>div{min-width:68px;padding-inline:13px}.catalog-stats dd{font-size:1.9rem}.catalog-layout{display:block;padding-top:24px}.sidebar-sticky{position:static}.sidebar-label{margin-bottom:10px}.category-nav{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:5px}.category-link{font-size:.76rem;padding:9px 10px;gap:7px;background:transparent;border:1px solid var(--line);border-radius:2px}.category-link[aria-current=true]{border-color:var(--teal)}.all-link{margin-bottom:0}.category-number{display:none}.category-link{grid-template-columns:1fr auto}.all-symbol{display:none}.sidebar-note{display:none}.catalog-content{margin-top:26px}.catalog-about{grid-template-columns:1fr;gap:20px;margin-top:42px}.catalog-about h2{margin-top:6px}.topic-row{grid-template-columns:34px minmax(0,1fr) 116px}.group-heading h2{font-size:1.2rem}}
@media(max-width:560px){.catalog-brand span{display:none}.mast-note{font-size:.68rem}.catalog-hero{display:block;padding:28px 0 25px}.catalog-hero h1{font-size:2.4rem}.catalog-hero .eyebrow{font-size:.7rem}.catalog-hero .lead{font-size:.88rem}.catalog-stats{margin-top:25px;justify-content:flex-start}.catalog-stats>div{min-width:88px;padding:0 22px;gap:5px}.catalog-stats>div:first-child{padding-left:0;border-left:0}.catalog-stats dd{font-size:1.9rem}.catalog-stats dt{font-size:.68rem}.catalog-layout{padding-top:22px}.category-nav{grid-template-columns:repeat(2,minmax(0,1fr))}.category-link{font-size:.76rem;padding:10px;min-height:44px}.category-count{font-size:.65rem}.catalog-tools{gap:8px;flex-wrap:wrap;margin-bottom:15px}.catalog-search{flex-basis:100%}.scope-field{width:100%}.scope-field select{width:100%;min-height:44px}.results-bar{gap:3px 10px;padding-bottom:12px}.results-bar p{font-size:.68rem}.reset-filters{font-size:.7rem}.topic-group{padding-top:25px}.group-heading{gap:8px;flex-wrap:wrap;position:relative}.group-heading>div{flex:1}.group-heading h2{font-size:1.08rem;padding-right:0}.group-heading p{font-size:.73rem}.group-count{font-size:.65rem;flex-basis:100%;margin:0 0 0 25px}.topic-row{grid-template-columns:27px minmax(0,1fr);gap:5px 9px;padding:16px 0}.topic-id{margin-top:5px;font-size:.64rem}.topic-title h3{font-size:.95rem;font-weight:500}.topic-copy p{font-size:.76rem;margin-top:4px}.topic-resources{grid-column:2;flex-direction:row;align-items:center;justify-content:space-between;margin-top:3px;font-size:.67rem;gap:14px}.offline-link{min-height:36px}.catalog-end{font-size:.7rem;line-height:1.8}.catalog-about{margin-top:35px;padding-top:22px}.catalog-footer{flex-wrap:wrap;font-size:.66rem;gap:8px}.empty-state{padding:45px 0}}
@media(prefers-reduced-motion:reduce){.topic-row{transition:none}}
@media print{.category-sidebar,.catalog-tools,.reset-filters,.catalog-end a{display:none}.catalog-layout{display:block}.catalog-page main{padding:0}.catalog-hero{padding-top:15px}.topic-group{break-inside:auto}.topic-row{break-inside:avoid}.catalog-about{display:block}}