/* Shared catalogue identity and navigation. Keep all catalogue sites on this file. */
:root{--space:#0c1d28;--panel:#152b37;--ink:#e0e8e4;--muted:#a0b4b6;--gold:#d0b57d;--line:#35505a}
body{background:var(--space);color:var(--ink)}
.catalogue-shell{position:sticky;top:0;z-index:10;background:var(--space);box-shadow:0 5px 16px #020b1230;border-bottom:1px solid var(--line)}
.catalogue-shell .catalogue-header{max-width:1500px;margin:0 auto;padding:20px 40px;min-height:84px;display:flex;align-items:center;justify-content:space-between;gap:24px;border:0}
.catalogue-header .catalogue-brand{color:var(--ink);text-decoration:none;font:600 27px/1.2 Georgia,serif;letter-spacing:-.5px}
.catalogue-header .catalogue-links{display:flex;align-items:center;flex-wrap:wrap;gap:8px;margin:0;padding:0;border:0;font:14px/1.4 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.catalogue-header .catalogue-links a{display:block;margin:0;padding:10px 15px;border:1px solid transparent;border-radius:5px;text-decoration:none;color:var(--muted);font-size:14px}
.catalogue-header .catalogue-links a:hover{color:var(--ink);background:var(--panel)}
.catalogue-header .catalogue-links a[aria-current=page]{color:var(--gold);border-color:var(--line);background:var(--panel)}
.catalogue-header .catalogue-links .play-link{color:var(--gold);margin-left:12px;border-left:1px solid var(--line);border-radius:0}
.catalogue-shell .collection-nav{max-width:1500px;display:flex;flex-wrap:wrap;gap:6px;margin:0 auto;padding:0 40px;border:0}
.catalogue-shell .collection-nav button{min-height:48px;margin:0;padding:13px 17px;border:0;border-radius:0;background:none;color:var(--muted);box-shadow:none;font:14px/1.4 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif}
.catalogue-shell .collection-nav button:hover{color:var(--ink);background:var(--panel)}
.catalogue-shell .collection-nav button[aria-pressed=true],.catalogue-shell .collection-nav button[aria-selected=true]{color:var(--gold);background:none;box-shadow:inset 0 -2px var(--gold)}
.catalogue-shell :focus-visible{outline:2px solid var(--gold);outline-offset:-3px}
.catalogue-shell+main{padding-top:26px}
.inspection-page>.catalogue-shell{display:block}
.inspection-page dialog{margin-top:0}
.inspection-navigation{display:flex;flex-wrap:wrap;gap:8px;margin-left:auto;font-size:13px}
.inspection-navigation a{padding:9px;color:var(--gold)}
@media(max-width:650px){.catalogue-shell .catalogue-header{padding:16px 18px;min-height:0;gap:12px;flex-wrap:wrap}.catalogue-header .catalogue-brand{font-size:25px}.catalogue-header .catalogue-links{gap:1px}.catalogue-header .catalogue-links a{padding:9px 10px;font-size:13px}.catalogue-header .catalogue-links .play-link{margin-left:2px}.catalogue-shell .collection-nav{padding:0 10px;gap:0}.catalogue-shell .collection-nav button{padding:12px 10px;font-size:13px;min-height:48px;flex:1 1 auto}.catalogue-shell+main{padding-top:20px}.inspection-navigation{width:100%;margin:0}.inspection-page .dialog-top{flex-wrap:wrap}}
@media(prefers-reduced-motion:reduce){.catalogue-shell *{scroll-behavior:auto!important}}

.catalogue-header .catalogue-brand{display:flex;align-items:center;gap:12px;white-space:nowrap}.catalogue-emblem{width:36px;height:36px;fill:none;stroke:var(--gold);stroke-width:1.2;flex:none}.catalogue-emblem circle:last-child{fill:var(--gold);stroke:none}.catalogue-header .catalogue-links a{min-height:42px}

.catalogue-header .catalogue-context{display:block;margin-top:3px;color:var(--muted);font:400 11px/1.3 -apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;letter-spacing:0}
.equation-card{margin:22px 0;padding:22px 24px;border:1px solid #819aa53b;border-radius:6px;background:#142a36;color:#e4e9e9;min-width:0;max-width:100%}
.equation-card>figcaption{font:600 17px/1.35 system-ui;color:#dfbd7b;margin:0 0 8px}
.equation-card>.equation-reading{font:14px/1.7 system-ui;max-width:72ch;margin:0 0 16px;color:#c2d0d6}
.equation-line{max-width:100%;min-width:0;overflow-x:auto;padding:12px 4px;overscroll-behavior-x:contain;scrollbar-width:thin}
.equation-line:focus-visible{outline:2px solid #dfbd7b;outline-offset:2px}
.equation-line math{font-family:'STIX Two Math','Cambria Math','Latin Modern Math',math;font-size:22px;line-height:1.8;text-align:left;margin:0;width:max-content;min-width:100%}
.equation-card .equation-symbols{display:grid;grid-template-columns:repeat(2,minmax(0,1fr));gap:8px 24px;margin:18px 0 0;padding-top:14px;border-top:1px solid #819aa53b}
.equation-card .equation-symbols>div{display:grid;grid-template-columns:minmax(42px,auto) minmax(0,1fr);gap:10px;align-items:baseline}
.equation-card .equation-symbols dt{margin:0;font:italic 16px/1.4 Georgia,serif;color:#e4e9e9}
.equation-card .equation-symbols dd{margin:0;font:12px/1.6 system-ui;color:#b3c6ce}
.equation-card .equation-details{margin:16px 0 0;border-top:1px solid #819aa53b}
.equation-card .equation-details>summary{color:#dfbd7b;font:13px/1.5 system-ui;cursor:pointer;padding:12px 0 0;min-height:40px}
.equation-card .equation-details pre{margin:12px 0 0;font:12px/1.7 ui-monospace,SFMono-Regular,monospace;color:#d5e1e5;background:#0e202b;border:0;border-radius:3px;padding:14px;white-space:pre-wrap;overflow-wrap:anywhere}
.notation-primer{border-top:2px solid #d5ae68;border-bottom:1px solid #819aa53b;padding:22px 0;margin-bottom:28px;max-width:76ch}
.notation-primer>h2{font:26px/1.25 Georgia,serif}
.notation-primer a{font-size:13px}
.formula-page .formula-content section{scroll-margin-top:110px}
@media(max-width:650px){.formula-page .formula-content section{scroll-margin-top:190px}}
@media(max-width:760px){.equation-card{padding:17px 14px}.equation-line math{font-size:20px}.equation-card .equation-symbols{grid-template-columns:1fr}.equation-card .equation-symbols>div{grid-template-columns:65px minmax(0,1fr)}}
@media print{.equation-card{background:white;color:black;break-inside:avoid}.equation-card>figcaption,.equation-card>.equation-reading,.equation-card .equation-symbols dt,.equation-card .equation-symbols dd{color:black}.equation-card .equation-details{display:block}.equation-line{overflow:visible}.equation-line math{font-size:16px}}