:root{--bg-primary:#070d1e;--bg-surface:#0e172e;--bg-surface-elevated:#152244;--bg-surface-hover:#1c2c58;--border-subtle:#ffffff14;--border-medium:#ffffff29;--border-accent:#f59e0b66;--text-main:#f1f5f9;--text-muted:#94a3b8;--text-subtle:#64748b;--text-inverse:#0f172a;--accent-gold:#f59e0b;--accent-gold-hover:#d97706;--accent-gold-bg:#f59e0b1f;--accent-gold-border:#f59e0b40;--accent-blue:#3b82f6;--accent-blue-hover:#2563eb;--accent-blue-bg:#3b82f61f;--accent-emerald:#10b981;--accent-emerald-bg:#10b9811f;--accent-crimson:#ef4444;--accent-crimson-bg:#ef44441f;--shadow-sm:0 1px 2px #0006;--shadow-md:0 4px 14px #00000073;--shadow-lg:0 10px 30px #0009;--shadow-glow-gold:0 0 20px #f59e0b40;--shadow-glow-blue:0 0 20px #3b82f640;--radius-sm:6px;--radius-md:10px;--radius-lg:16px;--radius-full:9999px;--font-family:"Plus Jakarta Sans", system-ui, -apple-system, sans-serif;--font-heading:"Outfit", "Plus Jakarta Sans", system-ui, sans-serif}[data-theme=light]{--bg-primary:#f8fafc;--bg-surface:#fff;--bg-surface-elevated:#f1f5f9;--bg-surface-hover:#e2e8f0;--border-subtle:#00000014;--border-medium:#00000024;--border-accent:#d9770666;--text-main:#0f172a;--text-muted:#475569;--text-subtle:#64748b;--text-inverse:#f8fafc;--accent-gold-bg:#f59e0b26;--accent-blue-bg:#3b82f626;--accent-emerald-bg:#10b98126}*{box-sizing:border-box;margin:0;padding:0}body{font-family:var(--font-family);background-color:var(--bg-primary);color:var(--text-main);-webkit-font-smoothing:antialiased;min-height:100vh;line-height:1.5}button{cursor:pointer;background:0 0;border:none;font-family:inherit;transition:all .2s}input,select,textarea{color:inherit;font-family:inherit}a{color:inherit;text-decoration:none}.app-container{flex-direction:column;min-height:100vh;display:flex}.main-content{flex:1;width:100%;max-width:1320px;margin:0 auto;padding:2rem 1.5rem}.app-header{z-index:40;-webkit-backdrop-filter:blur(14px);border-bottom:1px solid var(--border-subtle);background-color:#0e172ee0;padding:.875rem 1.5rem;position:sticky;top:0}.header-inner{justify-content:space-between;align-items:center;gap:1.25rem;max-width:1320px;margin:0 auto;display:flex}.brand-section{cursor:pointer;align-items:center;gap:.875rem;display:flex}.brand-logo-icon{border-radius:var(--radius-md);color:#000;width:42px;height:42px;box-shadow:var(--shadow-glow-gold);background:linear-gradient(135deg,#f59e0b,#b45309);justify-content:center;align-items:center;display:flex}.brand-title-wrap h1{font-family:var(--font-heading);letter-spacing:-.02em;background:linear-gradient(90deg,#fff,#cbd5e1);-webkit-text-fill-color:transparent;-webkit-background-clip:text;font-size:1.25rem;font-weight:800}.brand-subtitle{text-transform:uppercase;letter-spacing:.12em;color:var(--accent-gold);font-size:.72rem;font-weight:700}.header-center{flex:1;max-width:480px;position:relative}.search-input-wrap{align-items:center;display:flex;position:relative}.search-icon{color:var(--text-subtle);pointer-events:none;position:absolute;left:.875rem}.global-search-input{background-color:var(--bg-surface-elevated);border:1px solid var(--border-medium);border-radius:var(--radius-full);width:100%;color:var(--text-main);padding:.55rem 1rem .55rem 2.6rem;font-size:.875rem;transition:all .2s}.global-search-input:focus{border-color:var(--accent-gold);outline:none;box-shadow:0 0 0 3px #f59e0b26}.header-actions{align-items:center;gap:.75rem;display:flex}.badge{border-radius:var(--radius-full);letter-spacing:.02em;align-items:center;gap:.35rem;padding:.25rem .65rem;font-size:.75rem;font-weight:600;display:inline-flex}.badge-gold{background:var(--accent-gold-bg);color:var(--accent-gold);border:1px solid var(--accent-gold-border)}.badge-blue{background:var(--accent-blue-bg);color:var(--accent-blue);border:1px solid #3b82f64d}.badge-emerald{background:var(--accent-emerald-bg);color:var(--accent-emerald);border:1px solid #10b9814d}.badge-red{background:var(--accent-crimson-bg);color:var(--accent-crimson);border:1px solid #ef44444d}.btn{border-radius:var(--radius-md);justify-content:center;align-items:center;gap:.5rem;padding:.55rem 1.1rem;font-size:.875rem;font-weight:600;transition:all .2s cubic-bezier(.16,1,.3,1);display:inline-flex}.btn-primary{color:#000;background:linear-gradient(135deg,#f59e0b,#d97706);font-weight:700;box-shadow:0 2px 8px #f59e0b4d}.btn-primary:hover{background:linear-gradient(135deg,#fbbf24,#b45309);transform:translateY(-1px);box-shadow:0 4px 14px #f59e0b66}.btn-admin{color:#fff;background:linear-gradient(135deg,#dc2626,#991b1b);font-weight:700;box-shadow:0 2px 8px #dc26264d}.btn-admin:hover{background:linear-gradient(135deg,#ef4444,#7f1d1d);transform:translateY(-1px)}.btn-secondary{background-color:var(--bg-surface-elevated);border:1px solid var(--border-medium);color:var(--text-main)}.btn-secondary:hover{background-color:var(--bg-surface-hover);border-color:var(--accent-gold)}.btn-ghost{color:var(--text-muted);border-radius:var(--radius-md);padding:.5rem}.btn-ghost:hover{color:var(--text-main);background-color:var(--bg-surface-hover)}.breadcrumb-bar{color:var(--text-muted);align-items:center;gap:.5rem;margin-bottom:1.5rem;font-size:.85rem;display:flex}.breadcrumb-bar span.active{color:var(--accent-gold);font-weight:600}.breadcrumb-link{color:var(--text-muted);align-items:center;gap:.25rem;display:flex}.breadcrumb-link:hover{color:var(--text-main)}.stats-banner{background:linear-gradient(135deg, var(--bg-surface), #131f3e);border:1px solid var(--border-medium);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);grid-template-columns:repeat(auto-fit,minmax(180px,1fr)) 2fr;align-items:center;gap:1.5rem;margin-bottom:2rem;padding:1.25rem 1.75rem;display:grid}.stat-chip{align-items:center;gap:1rem;display:flex}.stat-icon-wrap{border-radius:var(--radius-sm);justify-content:center;align-items:center;width:30px;height:30px;display:flex}.stat-value{font-size:1.5rem;font-weight:800;font-family:var(--font-heading);line-height:1.1}.stat-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.05em;font-size:.75rem;font-weight:600}.progress-banner-wrap{flex-direction:column;gap:.5rem;display:flex}.progress-header{justify-content:space-between;font-size:.85rem;font-weight:600;display:flex}.progress-bar-track{background-color:var(--bg-primary);border-radius:var(--radius-full);border:1px solid var(--border-subtle);height:10px;overflow:hidden}.progress-bar-fill{border-radius:var(--radius-full);background:linear-gradient(90deg,#3b82f6,#f59e0b);height:100%;transition:width .6s cubic-bezier(.16,1,.3,1)}.section-header-row{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:1rem;margin-bottom:1.5rem;display:flex}.section-title-wrap h2{font-family:var(--font-heading);letter-spacing:-.02em;font-size:1.6rem;font-weight:800}.section-desc{color:var(--text-muted);margin-top:.25rem;font-size:.875rem}.cards-grid{grid-template-columns:repeat(auto-fill,minmax(320px,1fr));gap:1.5rem;display:grid}.course-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);flex-direction:column;transition:all .3s cubic-bezier(.16,1,.3,1);display:flex;position:relative;overflow:hidden}.course-card:hover{border-color:var(--accent-gold-border);box-shadow:var(--shadow-lg), var(--shadow-glow-gold);transform:translateY(-4px)}.course-card-thumb-wrap{background-color:#0b1426;width:100%;height:180px;position:relative;overflow:hidden}.course-card-thumb{object-fit:cover;width:100%;height:100%;transition:transform .4s}.course-card:hover .course-card-thumb{transform:scale(1.05)}.thumb-badges{justify-content:space-between;align-items:center;display:flex;position:absolute;top:.75rem;left:.75rem;right:.75rem}.course-card-body{flex-direction:column;flex:1;padding:1.25rem;display:flex}.course-card-title{font-size:1.15rem;font-weight:700;font-family:var(--font-heading);margin-bottom:.5rem;line-height:1.3}.course-card-desc{color:var(--text-muted);-webkit-line-clamp:2;-webkit-box-orient:vertical;margin-bottom:1.25rem;font-size:.85rem;line-height:1.5;display:-webkit-box;overflow:hidden}.course-card-footer{border-top:1px solid var(--border-subtle);justify-content:space-between;align-items:center;margin-top:auto;padding-top:1rem;display:flex}.subject-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);cursor:pointer;flex-direction:column;transition:all .3s;display:flex;overflow:hidden}.subject-card:hover{border-color:var(--accent-blue);box-shadow:var(--shadow-lg), var(--shadow-glow-blue);transform:translateY(-4px)}.subject-thumb-wrap{height:160px;position:relative;overflow:hidden}.subject-thumb{object-fit:cover;width:100%;height:100%}.heatmap-card{background:linear-gradient(145deg, var(--bg-surface), #111d3b);border:1px solid var(--border-medium);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);margin-bottom:2rem;padding:1.5rem}.heatmap-header{flex-wrap:wrap;justify-content:space-between;align-items:center;gap:.75rem;margin-bottom:1rem;display:flex}.heatmap-title-wrap{align-items:center;gap:.75rem;display:flex}.heatmap-title-wrap h3{font-size:1.1rem;font-family:var(--font-heading);font-weight:700}.heatmap-grid-scroll{padding-bottom:.5rem;overflow-x:auto}.heatmap-grid{grid-template-rows:repeat(7,14px);grid-auto-columns:14px;grid-auto-flow:column;gap:4px;width:max-content;display:grid}.heatmap-cell{cursor:pointer;border-radius:3px;width:14px;height:14px;transition:transform .15s}.heatmap-cell:hover{outline:1px solid #fff;transform:scale(1.3)}.heatmap-cell-lvl-0{background-color:#ffffff0d}.heatmap-cell-lvl-1{background-color:#0e4429}.heatmap-cell-lvl-2{background-color:#006d32}.heatmap-cell-lvl-3{background-color:#26a641}.heatmap-cell-lvl-4{background-color:#39d353}.heatmap-legend{color:var(--text-muted);align-items:center;gap:.35rem;font-size:.75rem;display:flex}.lecture-card{background-color:var(--bg-surface);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);flex-direction:column;transition:all .25s;display:flex;position:relative;overflow:hidden}.lecture-card.completed{background:linear-gradient(180deg, #10b9810a, var(--bg-surface));border-color:#10b98159}.lecture-card:hover{border-color:var(--border-accent);box-shadow:var(--shadow-md)}.lecture-thumb-wrap{cursor:pointer;height:160px;position:relative;overflow:hidden}.lecture-thumb{object-fit:cover;width:100%;height:100%}.lecture-play-overlay{opacity:0;background:#00000073;justify-content:center;align-items:center;transition:opacity .2s;display:flex;position:absolute;inset:0}.lecture-thumb-wrap:hover .lecture-play-overlay{opacity:1}.play-circle-btn{border-radius:var(--radius-full);background:var(--accent-gold);color:#000;justify-content:center;align-items:center;width:36px;height:36px;transition:transform .2s;display:flex;transform:scale(.9);box-shadow:0 2px 10px #f59e0b66}.lecture-thumb-wrap:hover .play-circle-btn{transform:scale(1)}.lecture-card-body{flex-direction:column;gap:.75rem;padding:1.25rem;display:flex}.lecture-topic-badge{color:var(--accent-gold);text-transform:uppercase;letter-spacing:.05em;font-size:.72rem;font-weight:700}.lecture-title{font-size:1.05rem;font-weight:700;line-height:1.35}.passcode-pill{background-color:var(--bg-surface-elevated);border:1px dashed var(--border-medium);border-radius:var(--radius-sm);color:var(--text-muted);align-items:center;gap:.5rem;width:fit-content;padding:.35rem .65rem;font-size:.75rem;display:inline-flex}.copy-pass-btn{color:var(--accent-gold);align-items:center;display:flex}.lecture-card-actions{border-top:1px solid var(--border-subtle);justify-content:space-between;align-items:center;margin-top:.5rem;padding-top:.75rem;display:flex}.modal-backdrop{-webkit-backdrop-filter:blur(8px);z-index:50;background:#040917c7;justify-content:center;align-items:center;padding:1.25rem;display:flex;position:fixed;inset:0}.modal-card{background-color:var(--bg-surface);border:1px solid var(--border-medium);border-radius:var(--radius-lg);width:100%;max-width:580px;max-height:90vh;box-shadow:var(--shadow-lg);animation:.25s cubic-bezier(.16,1,.3,1) modalPop;overflow-y:auto}.modal-card.modal-lg{max-width:900px}@keyframes modalPop{0%{opacity:0;transform:scale(.95)}to{opacity:1;transform:scale(1)}}.modal-header{border-bottom:1px solid var(--border-subtle);justify-content:space-between;align-items:center;padding:1.25rem 1.5rem;display:flex}.modal-header h3{font-size:1.25rem;font-weight:700;font-family:var(--font-heading)}.modal-body{flex-direction:column;gap:1.25rem;padding:1.5rem;display:flex}.modal-footer{border-top:1px solid var(--border-subtle);justify-content:flex-end;align-items:center;gap:.75rem;padding:1.25rem 1.5rem;display:flex}.form-group{flex-direction:column;gap:.45rem;display:flex}.form-label{color:var(--text-muted);text-transform:uppercase;letter-spacing:.03em;font-size:.8rem;font-weight:600}.form-input,.form-select,.form-textarea{background-color:var(--bg-surface-elevated);border:1px solid var(--border-medium);border-radius:var(--radius-md);color:var(--text-main);padding:.65rem .85rem;font-size:.875rem;transition:border-color .2s}.form-input:focus,.form-select:focus,.form-textarea:focus{border-color:var(--accent-gold);outline:none;box-shadow:0 0 0 3px #f59e0b26}.form-textarea{resize:vertical;min-height:85px}.video-player-container{aspect-ratio:16/9;border-radius:var(--radius-md);width:100%;box-shadow:var(--shadow-md);background-color:#000;position:relative;overflow:hidden}.video-player-container iframe{border:none;width:100%;height:100%}@media (width<=768px){.header-inner{flex-wrap:wrap}.header-center{order:3;width:100%;max-width:100%}.stats-banner{grid-template-columns:1fr 1fr}.progress-banner-wrap{grid-column:1/-1}.cards-grid{grid-template-columns:1fr}}.lecture-list-stack{flex-direction:column;gap:.75rem;display:flex}.lecture-row-item{background-color:var(--bg-surface);border:1px solid var(--border-medium);border-radius:var(--radius-md);cursor:pointer;justify-content:space-between;align-items:center;gap:1rem;padding:.85rem 1.25rem;transition:all .2s cubic-bezier(.16,1,.3,1);display:flex}.lecture-row-item:hover{border-color:var(--accent-blue);background-color:var(--bg-surface-elevated);transform:translate(3px);box-shadow:0 4px 14px #00000059}.lecture-row-item.completed{border-color:#10b98159}.lecture-row-left{flex:1;align-items:center;gap:1rem;min-width:0;display:flex}.lecture-folder-icon{border-radius:var(--radius-sm);width:38px;height:38px;color:var(--accent-blue);background-color:#3b82f61f;border:1px solid #3b82f640;flex-shrink:0;justify-content:center;align-items:center;transition:background-color .2s;display:flex}.lecture-row-item:hover .lecture-folder-icon{background-color:#3b82f638}.lecture-row-title{color:var(--text-main);white-space:nowrap;text-overflow:ellipsis;font-size:.95rem;font-weight:600;overflow:hidden}.lecture-row-right{flex-shrink:0;align-items:center;gap:.75rem;display:flex}.subject-disclaimer-footer{text-align:center;color:var(--text-subtle);letter-spacing:.02em;margin-top:3.5rem;padding:1.5rem;font-family:monospace;font-size:.8rem}