/* Contextual navigation for subject, module, topic and lesson pages only. */
.site-layout{display:grid;grid-template-columns:280px minmax(0,1fr);max-width:1480px;margin:0 auto;align-items:start}
.site-sidebar{position:sticky;top:18px;max-height:calc(100dvh - 36px);overflow-y:auto;overscroll-behavior:contain;scrollbar-width:thin;scrollbar-color:#bbccd6 transparent;padding:26px 18px 28px 22px;background:#f7f9fb;border-right:1px solid #e0e8ee;border-bottom:1px solid #e0e8ee;border-radius:0 0 12px 0}
.site-nav-panel>summary{display:none}
.sidebar-back{display:block;color:#647f91;font-size:.875rem;padding:3px 9px 20px}
.sidebar-subject{display:flex;gap:12px;align-items:center;padding:0 9px 20px;font-size:.94rem;line-height:1.5}
.sidebar-subject-code{display:grid;place-items:center;width:43px;height:43px;background:#fff0c4;color:#805e0c;border:1px solid #e9d798;border-radius:9px;font-weight:750;font-size:.81rem;flex:none}
.sidebar-label{display:block;color:#7b91a0;font-size:.75rem;letter-spacing:.1em;font-weight:700;padding:18px 10px 9px}
.sidebar-links{display:grid;gap:3px}
.sidebar-links a{display:flex;gap:11px;align-items:center;line-height:1.5;padding:10px;border-radius:6px;color:#466478;font-size:.875rem;min-height:42px}
.sidebar-links a:hover,.sidebar-module-row>a:hover,.sidebar-topics a:hover{background:#eaf0f5;text-decoration:none}
.sidebar-links a[aria-current],.sidebar-module-row>a[aria-current]{background:#e4eef5;color:#103c58;font-weight:700;box-shadow:inset 3px 0 #dbb147}
.sidebar-code{width:31px;flex:none;font-size:.75rem;color:#768b9a;font-weight:700}
.sidebar-number{font-size:.75rem;font-weight:650;color:#8b9faa;flex:none;min-width:20px}
.sidebar-overview{padding-bottom:5px;border-bottom:1px solid #dfe8ee}
.sidebar-module{margin:2px 0}
.sidebar-module-row{display:flex;align-items:stretch}
.sidebar-module-row>a{display:flex;align-items:start;gap:11px;flex:1;min-width:0;border-radius:6px;padding:11px 8px;font-size:.875rem;line-height:1.45;color:#3b5c72}
.sidebar-module-row .sidebar-number{padding-top:2px}
.sidebar-module-row>button{width:30px;min-height:44px;flex:none;display:grid;place-items:center;border:0;background:transparent;color:#7190a3;border-radius:6px}
.sidebar-module-row>button:hover{background:#e4eef4}
.sidebar-module-row>button[aria-expanded=true] svg{transform:rotate(90deg)}
.is-active-module>.sidebar-module-row>a{font-weight:700;color:#103c58}
.sidebar-topics{list-style:none;padding:5px 0 7px 13px;margin:2px 0 6px 15px;border-left:1px solid #ccdde8}
.sidebar-topics a{display:flex;align-items:start;gap:10px;padding:10px 9px;font-size:.875rem;line-height:1.5;color:#627c8d;border-radius:6px}
.sidebar-topics a>span:first-child{flex:none;font-size:.75rem;min-width:9px;padding-top:2px}
.sidebar-topics a[aria-current]{color:#0c3b55;background:#e2edf5;font-weight:650;box-shadow:inset 3px 0 #dbb147}
.sidebar-other-subjects{margin-top:20px;border-top:1px solid #dfe8ee;padding:15px 8px 0}
.sidebar-other-subjects summary{cursor:pointer;color:#526f83;font-size:.875rem;padding:5px 0}
.sidebar-site-links{border-top:1px solid #dfe8ee;margin-top:20px;padding-top:3px}
.site-page{min-width:0}
.site-page .container{width:calc(100% - 72px);max-width:1100px}
.site-page .gsl.container{width:calc(100% - 72px)}
.site-page .gsl-crumbs{margin-bottom:28px}
.site-page .gsl h1{font-size:clamp(2rem,3.1vw,3rem)}
.site-page .gsl-module-hero h1,.site-page .gsl-topic-hero h1{max-width:950px}
.site-page .gsl-reading-layout,.site-page .gsl-module-layout{display:block}
.site-page .gsl-topic-hero{padding-bottom:22px}
.site-page .gsl-contents{margin-top:4px}
.site-page .gsl-module-hero{padding-bottom:15px}
.site-page .gsl-topic-directory{padding-top:28px}
.site-page .gsl-topic-directory .gsl-topic-row{padding:25px 0}
.site-page .gsl-topic-directory .gsl-part-number{font-size:.875rem}
.site-page .gsl-module-meta,.site-page .gsl-stats,.site-page .gsl-topic-row small{font-size:.875rem}
.gsl-subject-intro{display:grid;grid-template-columns:minmax(0,1.45fr) minmax(220px,1fr);gap:32px;align-items:center}
.gsl-subject-intro h1{margin:12px 0 18px}
.gsl-subject-intro .gsl-intro p{font-size:1rem;line-height:1.8;margin:0}
.gsl-subject-image{margin:0;height:245px;border-radius:14px;overflow:hidden}
.gsl-subject-image img{display:block;width:100%;height:100%;object-fit:cover;object-position:60% center}
.gsl-subject-facts{display:flex;flex-wrap:wrap;gap:20px 35px;margin:30px 0 0;padding:21px 0;border-top:1px solid #e1e8ed;border-bottom:1px solid #e1e8ed}
.gsl-subject-facts>div{display:flex;gap:10px;align-items:baseline}
.gsl-subject-facts strong{font-family:Manrope,sans-serif;color:#153f59;font-weight:750;font-size:1.5rem}
.gsl-subject-facts span{font-size:.875rem;color:#728897}
.gsl-subject-about{padding:29px 0 0}
.gsl-subject-about h2,.gsl-study-approach h2{font-size:1.55rem;margin:0 0 14px}
.gsl-subject-about>p{font-size:1rem;max-width:850px;margin:0 0 24px}
.gsl-learning-themes{display:grid;grid-template-columns:repeat(3,minmax(0,1fr));gap:21px;margin:24px 0 32px}
.gsl-learning-themes>div{padding:0 18px 0 15px;border-left:3px solid #d9e5ed}
.gsl-learning-themes>div:first-child{border-left-color:#e0bd62}
.gsl-learning-themes h3{font-size:1rem;margin:0 0 9px;line-height:1.5}
.gsl-learning-themes p{font-size:.94rem;line-height:1.75;margin:0}
.gsl-subject-actions{display:flex;gap:22px;align-items:center;flex-wrap:wrap;margin-bottom:12px}
.gsl-subject-actions>a:not(.button){font-size:.875rem;color:#56778d}
.gsl-study-approach{margin:34px 0 0}
.gsl-study-approach ol{list-style:none;counter-reset:study-step;padding:0;margin:22px 0;display:grid;gap:19px}
.gsl-study-approach li{counter-increment:study-step;position:relative;padding-left:42px;line-height:1.7;color:#627b8b;font-size:1rem}
.gsl-study-approach li:before{content:counter(study-step);position:absolute;left:0;top:2px;width:27px;height:27px;display:grid;place-items:center;border-radius:50%;background:#edf3f7;color:#527084;font-size:.875rem;font-weight:700}
.gsl-study-approach li strong{display:block;color:#274a61;font-weight:650}
.study-ad-placement{display:block;margin:40px 0;padding:13px 18px 18px;border:1px solid #e4eaef;border-radius:9px;background:#fafbfc;text-align:center;clear:both}
.study-ad-label{display:block;font-size:.75rem;letter-spacing:.12em;color:#83939e;line-height:1.5}
.study-ad-placement .ad-content{margin-top:10px;min-height:90px}
.study-ad-placement .ad-placeholder{height:90px}
.site-page .section{padding-top:48px;padding-bottom:48px}
.site-page .page-hero{padding:38px 0}
.site-page .page-hero h1{font-size:clamp(2rem,3.4vw,3rem)}
.site-page .course-grid{grid-template-columns:1fr;gap:30px}
.site-page .lesson-layout{display:block;padding-top:36px}
.site-page .lesson-article{max-width:none}
@media(max-width:1180px) and (min-width:961px){
 .site-layout{grid-template-columns:255px minmax(0,1fr)}
 .site-sidebar{padding-left:12px;padding-right:12px}
 .site-page .container,.site-page .gsl.container{width:calc(100% - 48px)}
 .gsl-subject-intro{grid-template-columns:1fr}.gsl-subject-image{height:190px}
}
@media(max-width:960px){
 .site-layout{display:block}
 .site-sidebar{position:static;top:auto;max-height:none;overflow:visible;border-right:0;border-radius:0;padding:0 24px;background:#f3f7fa}
 .site-nav-panel>summary{display:flex;align-items:center;gap:12px;min-height:57px;padding:12px 0;font-size:.875rem;font-weight:650;color:#31566f;cursor:pointer;list-style:none}
 .site-nav-panel>summary::-webkit-details-marker{display:none}
 .site-nav-panel>summary>svg:last-child{margin-left:auto}
 .site-nav-panel[open]>summary>svg:last-child{transform:rotate(90deg)}
 .site-nav-content{max-height:65dvh;overflow-y:auto;overscroll-behavior:contain;padding:10px 4px 22px;scrollbar-width:thin}
 .sidebar-subject{padding-top:4px}
 .site-page .container,.site-page .gsl.container{width:calc(100% - 48px)}
 .gsl-subject-image{height:230px}
}
@media(max-width:700px){
 .site-page .container,.site-page .gsl.container{width:calc(100% - 32px)}
 .site-sidebar{padding:0 16px}
 .gsl-subject-intro{grid-template-columns:1fr;gap:24px}
 .gsl-subject-image{height:190px}
 .gsl-subject-facts{gap:16px 23px;margin-top:25px;padding:18px 0}
 .gsl-subject-facts>div{display:block}.gsl-subject-facts span{display:block;font-size:.81rem}
 .gsl-learning-themes{grid-template-columns:1fr;gap:20px;margin-bottom:27px}
 .gsl-subject-about{padding-top:27px}
 .site-page .gsl h1{font-size:2rem}
 .site-page .gsl-intro p{font-size:1rem}
 .study-ad-placement{padding:12px;margin:32px 0}.study-ad-placement .ad-content,.study-ad-placement .ad-placeholder{min-height:100px;height:auto}
 .site-page .gsl-topic-directory .gsl-topic-row{grid-template-columns:27px minmax(0,1fr) 20px;gap:9px}
}


.sidebar-audio-label{display:block;font-size:.75rem;color:#826318;margin-bottom:2px}.gsl-audio-row{background:#f5f8fa;padding-left:16px!important;padding-right:16px!important;border-radius:9px}.gsl-audio-row .gsl-part-number{color:#987323}

.site-page .gsl-next{display:grid;grid-template-columns:1fr 1fr;gap:20px;margin:35px 0}.site-page .gsl-next a{border:1px solid #dbe5ed;border-radius:9px;padding:19px;display:grid;gap:8px}.site-page .gsl-next small{color:#647c8d;font-size:.875rem}.site-page .gsl-next strong{font-size:1rem;line-height:1.6}@media(max-width:600px){.site-page .gsl-next{grid-template-columns:1fr}}

/* Audio navigation uses the supplied reference's 72 × 64 headphones/play size. */
.sidebar-topics a.sidebar-audio-link,.sidebar-links a.sidebar-audio-link{display:block;padding:10px 9px 13px;margin:4px 0 7px;background:#edf4f8;border-radius:9px}
.sidebar-topics a.sidebar-audio-link:hover,.sidebar-links a.sidebar-audio-link:hover{background:#e4eef5}
.sidebar-topics a.sidebar-audio-link[aria-current],.sidebar-links a.sidebar-audio-link[aria-current]{background:#e2edf5}
.sidebar-audio-link>.sidebar-audio-heading{display:flex;align-items:center;gap:8px;min-width:0;padding:0;margin:0 0 5px}
.sidebar-audio-heading .sidebar-audio-icon{display:block;flex:0 0 72px;width:72px;height:64px;max-width:none;object-fit:contain}
.sidebar-audio-heading .sidebar-audio-label{margin:0;color:#956c12;font-size:.8125rem;line-height:1.4;font-weight:650;white-space:nowrap}
.sidebar-audio-link .sidebar-audio-title{display:block;padding-left:24px;font-size:.875rem;line-height:1.5;font-weight:400;color:#627c8d;overflow-wrap:anywhere}

/* Unselected recordings follow the same compact rhythm as written topics. */
.sidebar-topics a.sidebar-audio-link:not([aria-current]),.sidebar-links a.sidebar-audio-link:not([aria-current]){display:flex;align-items:start;gap:10px;padding:10px 9px;margin:0;background:transparent;border-radius:6px}
.sidebar-topics a.sidebar-audio-link:not([aria-current]):hover,.sidebar-links a.sidebar-audio-link:not([aria-current]):hover{background:#eaf0f5}
.sidebar-audio-link:not([aria-current])>.sidebar-audio-heading{flex:0 0 18px;width:18px;min-width:18px;gap:0;margin:0;padding-top:2px}
.sidebar-audio-link:not([aria-current]) .sidebar-audio-icon{flex-basis:18px;width:18px;height:16px}
.sidebar-audio-link:not([aria-current]) .sidebar-audio-label{position:absolute;width:1px;height:1px;padding:0;margin:-1px;overflow:hidden;clip:rect(0,0,0,0);white-space:nowrap;border:0}
.sidebar-audio-link:not([aria-current]) .sidebar-audio-title{min-width:0;padding:0;display:-webkit-box;-webkit-box-orient:vertical;-webkit-line-clamp:2;line-clamp:2;height:3em;overflow:hidden}