/* BAVS v0.10.0 - Educational Lessons */
:root{
  --ls-primary:#2563eb;--ls-primary-2:#0f766e;--ls-ink:#0f2742;--ls-muted:#64748b;
  --ls-line:#dbe7f2;--ls-soft:#f7fbff;--ls-card:#fff;--ls-danger:#b42318;--ls-warning:#b45309;
  --ls-radius:22px;--ls-shadow:0 16px 44px rgba(30,64,175,.08)
}
[data-theme="dark"]{--ls-ink:#e5eef9;--ls-muted:#94a3b8;--ls-line:#25364c;--ls-soft:#101c2b;--ls-card:#132235;--ls-shadow:0 16px 44px rgba(0,0,0,.2)}
.lesson-hero{padding:42px 0 10px;background:radial-gradient(circle at 20% 20%,rgba(37,99,235,.16),transparent 35%),radial-gradient(circle at 80% 10%,rgba(15,118,110,.16),transparent 38%)}
.lesson-hero-inner{display:flex;gap:24px;align-items:end;justify-content:space-between}.lesson-kicker{display:inline-flex;align-items:center;gap:8px;color:var(--ls-primary);font-weight:800;font-size:.88rem}.lesson-kicker svg{width:18px;height:18px}.lesson-hero h1,.lesson-admin-head h1{margin:.45rem 0;font-size:clamp(1.8rem,4vw,3.25rem);color:var(--ls-ink);letter-spacing:-.03em}.lesson-hero p,.lesson-admin-head p{margin:0;color:var(--ls-muted);line-height:2;max-width:780px}.lesson-hero-stat{min-width:155px;background:var(--ls-card);border:1px solid var(--ls-line);border-radius:20px;padding:18px;text-align:center;box-shadow:var(--ls-shadow)}.lesson-hero-stat strong{display:block;font-size:2rem;color:var(--ls-primary)}.lesson-hero-stat span{color:var(--ls-muted);font-size:.85rem}
.lesson-browser{padding-top:20px}.lesson-scope-tabs,.lesson-admin-scope-tabs{display:flex;gap:9px;overflow:auto;padding:4px 1px 12px;scrollbar-width:thin}.lesson-scope-tabs a,.lesson-admin-scope-tabs a{white-space:nowrap;text-decoration:none;border:1px solid var(--ls-line);background:var(--ls-card);color:var(--ls-ink);border-radius:15px;padding:10px 16px;font-weight:800;transition:.18s ease}.lesson-scope-tabs a:hover,.lesson-scope-tabs a.active,.lesson-admin-scope-tabs a:hover,.lesson-admin-scope-tabs a.active{background:var(--ls-primary);border-color:var(--ls-primary);color:#fff;transform:translateY(-1px)}
.lesson-filter-panel,.lesson-admin-filters{display:grid;grid-template-columns:minmax(220px,1.6fr) repeat(4,minmax(130px,1fr)) auto;gap:12px;background:var(--ls-card);border:1px solid var(--ls-line);border-radius:var(--ls-radius);padding:16px;margin:8px 0 24px;box-shadow:var(--ls-shadow)}.lesson-filter-panel label,.lesson-admin-filters label,.lesson-form-grid label,.lesson-inline-form label,.lesson-form-card>label{display:flex;flex-direction:column;gap:7px;color:var(--ls-ink);font-weight:800;font-size:.85rem}.lesson-filter-panel input,.lesson-filter-panel select,.lesson-admin-filters input,.lesson-admin-filters select,.lesson-form-grid input,.lesson-form-grid select,.lesson-form-card>label select,.lesson-inline-form input,.lesson-inline-form select{width:100%;min-height:45px;border:1px solid var(--ls-line);border-radius:12px;background:var(--ls-soft);color:var(--ls-ink);padding:0 12px;outline:none;transition:.18s}.lesson-filter-panel input:focus,.lesson-filter-panel select:focus,.lesson-admin-filters input:focus,.lesson-admin-filters select:focus,.lesson-form-grid input:focus,.lesson-form-grid select:focus,.lesson-inline-form input:focus{border-color:var(--ls-primary);box-shadow:0 0 0 3px rgba(37,99,235,.1)}.lesson-filter-actions{display:flex;gap:8px;align-self:end}.lesson-filter-actions .btn,.lesson-filter-actions .admin-primary{white-space:nowrap}.lesson-search-field span{display:flex;align-items:center;gap:5px}.lesson-search-field svg{width:16px;height:16px}
.lesson-card-grid{display:grid;grid-template-columns:repeat(4,minmax(0,1fr));gap:16px}.lesson-card-grid.compact{grid-template-columns:repeat(3,minmax(0,1fr))}.lesson-card{background:var(--ls-card);border:1px solid var(--ls-line);border-radius:20px;overflow:hidden;box-shadow:0 8px 28px rgba(15,39,66,.06);transition:.2s ease}.lesson-card:hover{transform:translateY(-3px);box-shadow:0 16px 36px rgba(15,39,66,.11)}.lesson-card-media{position:relative;display:block;aspect-ratio:16/10;background:linear-gradient(135deg,#0f766e,#2563eb);overflow:hidden}.lesson-card-media img{width:100%;height:100%;object-fit:cover;display:block}.lesson-card-fallback{height:100%;display:flex;align-items:center;justify-content:center;flex-direction:column;gap:8px;color:#fff;background:linear-gradient(135deg,#123a68,#2563eb)}.lesson-big-icon{width:48px!important;height:48px!important}.lesson-play{position:absolute;inset:auto 14px 14px auto;width:42px;height:42px;border-radius:50%;display:grid;place-items:center;background:rgba(255,255,255,.93);color:var(--ls-primary);box-shadow:0 5px 16px rgba(0,0,0,.15)}.lesson-play svg{width:20px;height:20px}.lesson-card-body{padding:15px}.lesson-card-meta{display:flex;gap:7px;align-items:center;flex-wrap:wrap;color:var(--ls-muted);font-size:.78rem}.scope-pill,.subject-pill{display:inline-flex;align-items:center;border-radius:999px;padding:5px 10px;background:rgba(37,99,235,.1);color:var(--ls-primary);font-size:.76rem;font-weight:900}.subject-pill{background:rgba(15,118,110,.1);color:#0f766e}.lesson-card h2,.lesson-card h3{font-size:1rem;line-height:1.8;margin:10px 0}.lesson-card h2 a,.lesson-card h3 a{color:var(--ls-ink);text-decoration:none}.lesson-facts{display:grid;gap:7px;color:var(--ls-muted);font-size:.82rem}.lesson-facts span,.lesson-card-foot span,.lesson-admin-meta span{display:flex;align-items:center;gap:6px}.lesson-facts svg,.lesson-card-foot svg,.lesson-admin-meta svg{width:15px;height:15px}.lesson-card-foot{display:flex;justify-content:space-between;gap:8px;border-top:1px dashed var(--ls-line);margin-top:12px;padding-top:10px;color:var(--ls-muted);font-size:.74rem}.lesson-empty{text-align:center;padding:48px 20px;border:1px dashed var(--ls-line);border-radius:22px;background:var(--ls-card)}.lesson-empty>span svg,.lesson-empty>svg{width:54px;height:54px;color:var(--ls-primary)}.lesson-empty h2{color:var(--ls-ink)}.lesson-empty p{color:var(--ls-muted)}
.lesson-pagination{display:flex;justify-content:center;gap:7px;flex-wrap:wrap;margin:28px 0}.lesson-pagination a{width:39px;height:39px;border-radius:11px;border:1px solid var(--ls-line);display:grid;place-items:center;text-decoration:none;color:var(--ls-ink);background:var(--ls-card);font-weight:800}.lesson-pagination a.active{background:var(--ls-primary);border-color:var(--ls-primary);color:#fff}
.lesson-single{padding-top:28px}.lesson-breadcrumb{display:flex;gap:7px;align-items:center;flex-wrap:wrap;color:var(--ls-muted);font-size:.82rem;margin-bottom:14px}.lesson-breadcrumb a{color:var(--ls-primary);text-decoration:none}.lesson-single-grid{display:grid;grid-template-columns:minmax(0,1.55fr) minmax(330px,.75fr);gap:20px;align-items:start}.lesson-player-card,.lesson-detail-card{background:var(--ls-card);border:1px solid var(--ls-line);border-radius:24px;box-shadow:var(--ls-shadow);overflow:hidden}.lesson-player{aspect-ratio:16/9;background:#07111d;display:grid;place-items:center;position:relative}.lesson-player iframe,.lesson-player video{width:100%;height:100%;border:0;display:block;object-fit:contain}.lesson-player-unavailable{color:#fff;text-align:center;padding:30px}.lesson-player-note{position:absolute;bottom:8px;right:10px;left:10px;padding:7px 10px;background:rgba(0,0,0,.6);color:#fff;border-radius:9px;font-size:.75rem}.lesson-detail-card{padding:22px;position:sticky;top:95px}.lesson-title-row{display:flex;gap:8px;flex-wrap:wrap}.lesson-detail-card h1{font-size:clamp(1.4rem,2.4vw,2rem);line-height:1.7;margin:12px 0;color:var(--ls-ink)}.lesson-detail-facts{display:grid;gap:9px}.lesson-detail-facts>div{display:grid;grid-template-columns:34px 72px 1fr;gap:8px;align-items:center;border:1px solid var(--ls-line);border-radius:13px;padding:9px 10px;background:var(--ls-soft)}.lesson-detail-facts>div>span{width:30px;height:30px;border-radius:9px;display:grid;place-items:center;background:rgba(37,99,235,.1);color:var(--ls-primary)}.lesson-detail-facts svg{width:17px;height:17px}.lesson-detail-facts b{color:var(--ls-muted);font-size:.77rem}.lesson-detail-facts strong{color:var(--ls-ink);font-size:.84rem}.lesson-description{margin-top:16px;border-top:1px solid var(--ls-line);padding-top:14px;color:var(--ls-ink);line-height:2}.lesson-description h2{font-size:1rem;margin:0 0 6px}.lesson-single-actions,.lesson-admin-actions{display:flex;gap:8px;flex-wrap:wrap;margin-top:16px}.lesson-admin-actions{border-top:1px dashed var(--ls-line);padding-top:14px}.lesson-admin-actions>span{width:100%;font-size:.75rem;color:var(--ls-muted)}.lesson-danger,.admin-danger{background:#fff0ef!important;color:var(--ls-danger)!important;border:1px solid #f6c7c2!important;border-radius:11px!important;padding:9px 13px!important;font-weight:800!important;cursor:pointer}.lesson-related{margin-top:30px}.lesson-section-head{display:flex;justify-content:space-between;align-items:end;margin-bottom:12px}.lesson-section-head h2{margin:4px 0;color:var(--ls-ink)}
/* Admin */
.lesson-admin-head{display:flex;justify-content:space-between;gap:20px;align-items:flex-end;margin-bottom:16px}.lesson-admin-head h1{font-size:2rem}.lesson-admin-head-actions{display:flex;gap:8px;flex-wrap:wrap}.lesson-admin-scope-tabs{margin-bottom:10px}.lesson-admin-scope-tabs a{display:flex;align-items:center;gap:10px}.lesson-admin-scope-tabs a b{min-width:28px;height:28px;border-radius:9px;display:grid;place-items:center;background:rgba(37,99,235,.1);color:var(--ls-primary)}.lesson-admin-scope-tabs a.active b{background:rgba(255,255,255,.2);color:#fff}.lesson-admin-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:10px;margin-bottom:14px}.lesson-admin-stats article{border:1px solid var(--ls-line);background:var(--ls-card);border-radius:16px;padding:14px}.lesson-admin-stats span{color:var(--ls-muted);font-size:.78rem}.lesson-admin-stats strong{display:block;color:var(--ls-ink);font-size:1.65rem;margin-top:3px}.lesson-admin-filters{grid-template-columns:minmax(220px,1.6fr) repeat(5,minmax(110px,1fr)) auto}.lesson-admin-filters .wide{min-width:210px}.lesson-admin-list{display:grid;gap:10px}.lesson-admin-row{display:grid;grid-template-columns:110px minmax(0,1fr) auto;gap:14px;align-items:center;background:var(--ls-card);border:1px solid var(--ls-line);border-radius:18px;padding:10px}.lesson-admin-cover{height:78px;border-radius:13px;background:linear-gradient(135deg,#123a68,#2563eb);display:grid;place-items:center;overflow:hidden;color:#fff}.lesson-admin-cover img{width:100%;height:100%;object-fit:cover}.lesson-admin-main h2{margin:6px 0;color:var(--ls-ink);font-size:1rem;line-height:1.65}.lesson-admin-badges,.lesson-admin-meta{display:flex;gap:6px;align-items:center;flex-wrap:wrap}.status-chip{font-size:.7rem;font-weight:800;padding:4px 8px;border-radius:999px;background:#edf2f7;color:#475569}.status-chip.status-published,.status-chip.visible{background:#e9f8ef;color:#087a4e}.status-chip.status-draft{background:#fff6df;color:#9a6700}.status-chip.status-archived,.status-chip.hidden{background:#f1f5f9;color:#64748b}.status-chip.warning{background:#fff0df;color:#b45309}.lesson-admin-meta{color:var(--ls-muted);font-size:.74rem}.lesson-admin-actions{border:0;padding:0;margin:0;justify-content:flex-end}.lesson-admin-actions form{margin:0}.lesson-admin-actions .admin-primary,.lesson-admin-actions .admin-danger{display:flex;align-items:center;gap:5px;white-space:nowrap}.lesson-admin-actions svg{width:16px;height:16px}
/* Form Studio */
.lesson-form-head{align-items:end}.lesson-studio-grid{display:grid;grid-template-columns:minmax(0,1fr) 300px;gap:18px;align-items:start}.lesson-studio-main{display:grid;gap:14px}.lesson-form-card,.lesson-save-card,.lesson-help-card,.lesson-delete-card{background:var(--ls-card);border:1px solid var(--ls-line);border-radius:20px;padding:18px;box-shadow:0 8px 26px rgba(15,39,66,.04)}.lesson-form-card-head{display:flex;gap:11px;align-items:center;margin-bottom:15px}.lesson-form-card-head>span{width:38px;height:38px;border-radius:12px;display:grid;place-items:center;background:rgba(37,99,235,.1);color:var(--ls-primary);font-weight:900}.lesson-form-card-head h2{margin:0;color:var(--ls-ink);font-size:1.05rem}.lesson-form-card-head p{margin:2px 0 0;color:var(--ls-muted);font-size:.78rem}.lesson-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.lesson-form-grid .span-2{grid-column:1/-1}.lesson-form-grid label>b,.lesson-grade-picker strong>b{color:#dc2626}.lesson-form-grid small{color:var(--ls-muted);font-weight:500;line-height:1.7}.lesson-rich{margin-top:14px;border:1px solid var(--ls-line);border-radius:14px;overflow:hidden;background:var(--ls-soft)}.lesson-rich-toolbar{display:flex;gap:5px;flex-wrap:wrap;padding:8px;border-bottom:1px solid var(--ls-line);background:var(--ls-card)}.lesson-rich-toolbar button{border:1px solid var(--ls-line);background:var(--ls-soft);color:var(--ls-ink);border-radius:8px;padding:5px 9px;cursor:pointer}.lesson-rich-editor{min-height:160px;padding:14px;color:var(--ls-ink);line-height:2;outline:none}.lesson-grade-picker{margin-bottom:13px}.lesson-grade-picker>strong{display:block;color:var(--ls-ink);margin-bottom:8px}.lesson-grade-options{display:flex;gap:8px;flex-wrap:wrap}.lesson-grade-options label{cursor:pointer}.lesson-grade-options input{position:absolute;opacity:0;pointer-events:none}.lesson-grade-options span{display:inline-flex;border:1px solid var(--ls-line);background:var(--ls-soft);color:var(--ls-ink);padding:9px 13px;border-radius:11px;font-weight:800;font-size:.8rem}.lesson-grade-options input:checked+span{background:var(--ls-primary);border-color:var(--ls-primary);color:#fff}.lesson-quick-grid{display:grid;grid-template-columns:1fr 1fr;gap:10px;margin-top:13px}.lesson-quick-card{border:1px dashed var(--ls-line);border-radius:14px;background:var(--ls-soft);overflow:hidden}.lesson-quick-card summary{cursor:pointer;padding:11px 12px;color:var(--ls-primary);font-weight:900;display:flex;gap:6px;align-items:center}.lesson-quick-card summary svg{width:16px;height:16px}.lesson-quick-card>div{border-top:1px dashed var(--ls-line);padding:12px}.lesson-inline-form{display:grid;grid-template-columns:1fr 1fr;gap:9px}.lesson-inline-form button,.lesson-inline-form p{grid-column:1/-1}.lesson-inline-form p{margin:0;color:var(--ls-muted);font-size:.78rem}.lesson-inline-form p.ok{color:#087a4e}.lesson-inline-form p.error{color:#b42318}.lesson-cover-drop{position:relative;min-height:170px;border:1px dashed var(--ls-line);border-radius:16px;background:var(--ls-soft);display:flex;align-items:center;justify-content:center;flex-direction:column;gap:8px;overflow:hidden;margin-bottom:14px}.lesson-cover-drop input{display:none}.lesson-cover-drop>img{width:100%;height:220px;object-fit:cover}.lesson-cover-drop>[data-cover-placeholder]{display:flex;align-items:center;justify-content:center;flex-direction:column;gap:5px;color:var(--ls-muted)}.lesson-cover-drop .admin-primary{position:relative;z-index:2}.lesson-switch{display:flex!important;flex-direction:row!important;align-items:center;gap:9px!important;margin-top:13px;cursor:pointer}.lesson-switch input{display:none}.lesson-switch>span{width:44px;height:24px;border-radius:999px;background:#cbd5e1;position:relative;transition:.2s}.lesson-switch>span:after{content:"";position:absolute;width:18px;height:18px;border-radius:50%;background:#fff;top:3px;right:3px;transition:.2s;box-shadow:0 2px 6px rgba(0,0,0,.15)}.lesson-switch input:checked+span{background:var(--ls-primary)}.lesson-switch input:checked+span:after{transform:translateX(-20px)}.lesson-studio-side{display:grid;gap:12px;position:sticky;top:84px}.lesson-save-card h2,.lesson-help-card h3,.lesson-delete-card h3{color:var(--ls-ink);margin:10px 0 6px}.lesson-save-card p,.lesson-help-card,.lesson-delete-card p{color:var(--ls-muted);line-height:1.9;font-size:.82rem}.lesson-save-button{width:100%;display:flex;justify-content:center;align-items:center;gap:7px;margin:12px 0}.lesson-save-button svg{width:17px;height:17px}.lesson-save-card small{display:block;color:var(--ls-muted);font-size:.7rem}.lesson-help-card ul{padding-right:17px;margin:5px 0}.lesson-help-card li{margin:5px 0}.lesson-delete-card{border-color:#f5c2c0;background:#fff9f8}.lesson-delete-card .admin-danger{width:100%}
@media(max-width:1180px){.lesson-card-grid{grid-template-columns:repeat(3,1fr)}.lesson-admin-filters,.lesson-filter-panel{grid-template-columns:repeat(3,1fr)}.lesson-search-field,.lesson-admin-filters .wide{grid-column:span 2}.lesson-filter-actions{grid-column:1/-1}.lesson-studio-grid{grid-template-columns:1fr}.lesson-studio-side{position:static;grid-template-columns:repeat(3,1fr)}}
@media(max-width:860px){.lesson-hero-inner,.lesson-admin-head{align-items:stretch;flex-direction:column}.lesson-hero-stat{width:100%}.lesson-card-grid,.lesson-card-grid.compact{grid-template-columns:repeat(2,1fr)}.lesson-single-grid{grid-template-columns:1fr}.lesson-detail-card{position:static}.lesson-admin-stats{grid-template-columns:repeat(2,1fr)}.lesson-admin-row{grid-template-columns:90px 1fr}.lesson-admin-actions{grid-column:1/-1}.lesson-studio-side{grid-template-columns:1fr}.lesson-quick-grid{grid-template-columns:1fr}}
@media(max-width:620px){.lesson-hero{padding-top:25px}.lesson-hero h1,.lesson-admin-head h1{font-size:1.65rem}.lesson-filter-panel,.lesson-admin-filters{grid-template-columns:1fr;padding:12px}.lesson-search-field,.lesson-admin-filters .wide{grid-column:auto}.lesson-filter-actions{grid-column:auto}.lesson-card-grid,.lesson-card-grid.compact{grid-template-columns:1fr}.lesson-admin-stats{grid-template-columns:1fr 1fr}.lesson-admin-row{grid-template-columns:68px 1fr;padding:8px}.lesson-admin-cover{height:62px}.lesson-admin-actions{justify-content:stretch}.lesson-admin-actions>a,.lesson-admin-actions>form,.lesson-admin-actions button{flex:1;width:100%}.lesson-form-grid{grid-template-columns:1fr}.lesson-form-grid .span-2{grid-column:auto}.lesson-inline-form{grid-template-columns:1fr}.lesson-grade-options span{padding:8px 10px}.lesson-player-card,.lesson-detail-card{border-radius:18px}.lesson-detail-card{padding:16px}.lesson-scope-tabs a,.lesson-admin-scope-tabs a{padding:9px 12px}}

/* v0.10.1 — smart 20-second card frame preview */
.lesson-card-media .lesson-card-frame,.lesson-admin-cover .lesson-card-frame{position:absolute;inset:0;width:100%;height:100%;object-fit:cover;display:block;opacity:0;pointer-events:none;background:#07111f;transition:opacity .22s ease;z-index:1}
.lesson-card-media.is-frame-ready .lesson-card-frame,.lesson-admin-cover.is-frame-ready .lesson-card-frame{opacity:1}
.lesson-card-media .lesson-card-cover{transition:opacity .22s ease}.lesson-card-media.is-frame-ready .lesson-card-cover{opacity:0}
.lesson-card-media.is-frame-ready .lesson-card-fallback{opacity:0}
.lesson-card-fallback{transition:opacity .22s ease}
.lesson-play{z-index:3}
.lesson-admin-cover{position:relative}.lesson-admin-cover .lesson-card-cover{width:100%;height:100%;object-fit:cover;display:block;transition:opacity .22s ease}.lesson-admin-cover.is-frame-ready .lesson-card-cover,.lesson-admin-cover.is-frame-ready .lesson-admin-cover-fallback{opacity:0}.lesson-admin-cover-fallback{display:grid;place-items:center;width:100%;height:100%;transition:opacity .22s ease}
@media (prefers-reduced-motion:reduce){.lesson-card-media .lesson-card-frame,.lesson-admin-cover .lesson-card-frame,.lesson-card-media .lesson-card-cover{transition:none}}