#lesson-menu-open{width:100%;display:flex;align-items:center;justify-content:space-between;gap:12px;margin:10px 0;padding:12px 15px;border-radius:12px;background:#edf2ff;border:1px solid #cbd8ff;color:#143cb5;font-weight:700;text-align:left}#lesson-menu-open span{font-size:12px;font-weight:400;color:#516083}
#lesson-menu{width:min(1120px,96vw);max-width:none;max-height:94dvh;padding:0;border:1px solid #dce4f5;border-radius:22px;background:#f8faff;color:#122348;box-shadow:0 25px 100px #07153555;overflow:hidden}#lesson-menu::backdrop{background:#09173380;backdrop-filter:blur(4px)}
.lesson-menu-header{display:flex;justify-content:space-between;align-items:center;padding:22px 26px 14px;background:white}.lesson-menu-header h2{font:700 25px/1.2 system-ui;margin:3px 0}.lesson-eyebrow{font:700 10px/1.5 system-ui;letter-spacing:1.5px;color:#4564a3;margin:0}.lesson-menu-header button{background:#f0f4fc;color:#344766;border:0;border-radius:50%;width:38px;height:38px;font-size:18px}
.lesson-search-row{display:flex;gap:16px;padding:0 26px 18px;background:white;border-bottom:1px solid #e0e7f4}.lesson-search-row label{flex:1;font-size:12px;color:#596984;margin:0}#lesson-menu input,#lesson-menu select{display:block;width:100%;box-sizing:border-box;padding:11px 12px;border:1px solid #d1dbed;border-radius:9px;background:#fff;color:#152644;font:14px system-ui;margin-top:6px}.lesson-search-row #opening-family-wrap{flex:0 1 270px}
.lesson-menu-layout{display:grid;grid-template-columns:180px minmax(250px,1fr) 285px;height:min(560px,65dvh)}#lesson-categories{padding:17px 10px;border-right:1px solid #e0e7f4;overflow:auto}#lesson-categories button{display:block;width:100%;text-align:left;background:transparent;border:0;color:#4f607c;border-radius:9px;padding:12px;margin:3px 0;font-size:13px;font-weight:600}#lesson-categories button[aria-pressed=true]{background:#2458e8;color:white}
.lesson-browser{padding:16px 18px;overflow:auto}#lesson-category-intro{font-size:13px;line-height:1.5;margin:0;color:#53647c}#lesson-count{font-size:11px;color:#718099;margin:10px 0 14px}#lesson-results{display:grid;grid-template-columns:1fr 1fr;gap:10px}.lesson-card{display:flex;flex-direction:column;gap:7px;text-align:left;background:#fff;border:1px solid #dfe6f3;border-radius:12px;padding:14px;min-height:94px;color:#172b51}.lesson-card:hover,.lesson-card[aria-pressed=true]{border-color:#6486ef;background:#f0f4ff}.lesson-card strong{font:650 13px/1.45 system-ui}.lesson-card-type{font:10px/1.4 system-ui;color:#617491}#lesson-more{margin-top:15px;width:100%;background:white;color:#2856cc;border:1px solid #cad7f2;border-radius:9px;padding:10px}
#lesson-detail{padding:21px 19px;background:#eef3ff;border-left:1px solid #dce5f6;overflow:auto}#lesson-detail h3{font:700 20px/1.3 system-ui;margin:10px 0}#lesson-detail-description{font-size:13px;line-height:1.6;color:#52617a}#lesson-detail-kind{font-size:11px;font-weight:600;color:#4263aa}#lesson-opening-options label{display:block;font-size:12px;margin-top:10px}.lesson-detail-actions{display:grid;gap:8px;margin-top:18px}.lesson-detail-actions button{font-size:12px;border-radius:9px;padding:11px;min-height:42px}.lesson-detail-actions .primary{background:#2458e8;color:white;border:1px solid #2458e8}.lesson-detail-actions button:not(.primary){background:white;border:1px solid #c7d5f1;color:#2c4d98}.lesson-access-note{font-size:11px;line-height:1.5;color:#677894;margin-top:20px}#lesson-menu-status{font-size:12px;line-height:1.5;color:#783822}#lesson-menu [hidden]{display:none!important}#lesson-menu button:focus-visible,#lesson-menu input:focus-visible,#lesson-menu select:focus-visible{outline:3px solid #ffbf47;outline-offset:2px}
@media(max-width:850px){.lesson-menu-layout{grid-template-columns:145px minmax(200px,1fr) 235px}#lesson-results{grid-template-columns:1fr}}
@media(max-width:650px){#lesson-menu{width:96vw;border-radius:14px}.lesson-menu-header{padding:16px}.lesson-menu-header h2{font-size:19px}.lesson-search-row{padding:0 16px 12px;flex-direction:column;gap:8px}.lesson-search-row #opening-family-wrap{flex:auto}.lesson-menu-layout{display:grid;grid-template-columns:1fr 1fr;grid-template-rows:auto minmax(0,1fr);height:60dvh}#lesson-categories{grid-column:1/-1;display:flex;gap:5px;padding:7px;overflow:auto;border-bottom:1px solid #dce5f6}#lesson-categories button{white-space:nowrap;width:auto;padding:9px;font-size:11px}.lesson-browser{padding:12px 8px}#lesson-detail{padding:14px 10px}#lesson-detail h3{font-size:16px}.lesson-card{padding:10px}.lesson-card strong{font-size:12px}#lesson-category-intro{font-size:11px}.lesson-access-note{font-size:10px}#lesson-menu-open span{display:none}}

/* A directory of categories, expandable sections and compact lesson rows. */
#lesson-results{display:block}.lesson-subsection{margin:0 0 8px;border:1px solid #dce4f2;border-radius:10px;background:#fff;overflow:hidden}.lesson-subsection>summary{cursor:pointer;padding:14px;font-size:13px;font-weight:650;line-height:1.5;color:#193d7d}.lesson-subsection[open]>summary{background:#edf2ff;border-bottom:1px solid #dce4f2}.lesson-section-list{padding:4px 10px}.lesson-card{width:100%;min-height:0;border:0;border-bottom:1px solid #e7edf6;border-radius:0;padding:12px 8px;gap:3px}.lesson-card strong{font-size:13px}.lesson-card:last-child{border-bottom:0}.lesson-section-list>button:not(.lesson-card){width:100%;margin:8px 0}.lesson-subsection>summary:focus-visible{outline:3px solid #ffbf47;outline-offset:-3px}
@media(max-width:650px){.lesson-menu-layout{display:block;overflow:auto;height:60dvh}#lesson-categories{display:block;overflow:visible;padding:10px 14px}#lesson-categories button{width:100%;white-space:normal;font-size:13px;padding:10px;margin:2px 0}.lesson-browser{overflow:visible;padding:16px}#lesson-detail{overflow:visible;border-left:0;border-top:1px solid #dce5f6;padding:18px}.lesson-subsection>summary{font-size:14px}.lesson-card strong{font-size:14px}.lesson-search-row{position:relative}.lesson-menu-header h2{font-size:18px}}

#lesson-custom{width:100%;margin:0 0 14px;padding:12px;text-align:left;overflow-wrap:anywhere;background:#edf2ff;border:1px solid #a9bdf9;border-radius:10px;color:#183a80}