.bd-page{background:#f9fafb;min-height:100vh}.bd-not-found{text-align:center;padding:120px 20px}.bd-not-found p{margin-bottom:16px;font-size:1.2rem;font-weight:700}.bd-not-found a{color:var(--primary);font-weight:600}.bd-container{grid-template-columns:1fr 320px;align-items:start;gap:28px;max-width:1100px;margin:0 auto;padding:24px 20px 60px;display:grid}.bd-header-card{background:var(--white);border-radius:var(--radius-lg);border:1px solid var(--border);margin-bottom:24px;overflow:hidden}.bd-header-thumb{aspect-ratio:16/9;position:relative;overflow:hidden}.bd-header-thumb img{object-fit:cover;width:100%;height:100%}.bd-promo-btn{-webkit-backdrop-filter:blur(8px);color:#fff;cursor:pointer;background:#0006;border:1px solid #ffffff4d;border-radius:50px;align-items:center;gap:10px;padding:12px 24px;font-size:.9rem;font-weight:700;transition:all .3s cubic-bezier(.4,0,.2,1);display:flex;position:absolute;top:50%;left:50%;transform:translate(-50%,-50%);box-shadow:0 8px 32px #0000004d}.bd-promo-btn:hover{background:#0d6b3fcc;border-color:#ffffff80;transform:translate(-50%,-50%)scale(1.05);box-shadow:0 12px 40px #0d6b3f66}.bd-promo-btn svg{filter:drop-shadow(0 0 8px #ffffff4d)}.bd-header-info{padding:20px}.bd-header-info h1{color:var(--text-dark);margin-bottom:8px;font-size:1.3rem;font-weight:800;line-height:1.4}.bd-header-instructor{color:var(--text-muted);align-items:center;gap:6px;margin-bottom:10px;font-size:.82rem;display:flex}.bd-header-instructor svg{width:16px;height:16px;stroke:var(--text-light)}.bd-header-desc{color:var(--text-muted);margin-bottom:14px;font-size:.85rem;line-height:1.6}.bd-header-meta{flex-wrap:wrap;gap:16px;display:flex}.bd-header-meta span{color:var(--text-muted);background:#f3f4f6;border-radius:6px;align-items:center;gap:5px;padding:4px 10px;font-size:.75rem;font-weight:600;display:flex}.bd-header-meta svg{width:14px;height:14px;stroke:var(--text-light)}.bd-preview-video{background:var(--white);border-radius:var(--radius-lg);border:1px solid var(--border);margin-bottom:24px;animation:.3s brCardUp;overflow:hidden}.bd-preview-header{border-bottom:1px solid var(--border);background:#f0fdf4;justify-content:space-between;align-items:center;padding:14px 18px;display:flex}.bd-preview-header h3{color:var(--primary-dark);font-size:.88rem;font-weight:700}.bd-preview-header button{cursor:pointer;width:32px;height:32px;transition:var(--transition);background:#fff;border:none;border-radius:50%;font-size:1rem}.bd-preview-header button:hover{background:#fee2e2}.bd-video-wrap{aspect-ratio:16/9;position:relative}.bd-video-wrap iframe{border:none;width:100%;height:100%;position:absolute;inset:0}.bd-modules-section{margin-bottom:24px}.bd-modules-title{color:var(--text-dark);flex-wrap:wrap;align-items:center;gap:8px;margin-bottom:16px;font-size:1rem;font-weight:800;display:flex}.bd-modules-title svg{width:20px;height:20px;stroke:var(--primary)}.bd-modules-count{color:var(--text-muted);background:#f3f4f6;border-radius:12px;margin-left:auto;padding:3px 10px;font-size:.72rem;font-weight:600}.bd-module{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-md);transition:var(--transition);margin-bottom:8px;overflow:hidden}.bd-module:hover{border-color:var(--primary-light)}.bd-module-toggle{cursor:pointer;text-align:left;width:100%;transition:var(--transition);background:0 0;border:none;align-items:center;gap:12px;padding:14px 16px;font-family:inherit;display:flex}.bd-module-toggle:hover{background:#fafafa}.bd-module-num{background:var(--primary-lightest);width:32px;height:32px;color:var(--primary);border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-size:.78rem;font-weight:800;display:flex}.bd-module-toggle-text{flex:1;min-width:0}.bd-module-toggle-text h3{color:var(--text-dark);white-space:nowrap;text-overflow:ellipsis;font-size:.85rem;font-weight:700;overflow:hidden}.bd-module-toggle-text span{color:var(--text-muted);font-size:.68rem;font-weight:600}.bd-free-tag{color:#15803d;background:#dcfce7;border-radius:4px;flex-shrink:0;padding:2px 8px;font-size:.6rem;font-weight:800}.bd-module-arrow{flex-shrink:0;justify-content:center;align-items:center;width:24px;height:24px;transition:transform .3s;display:flex}.bd-module-arrow svg{width:20px;height:20px;stroke:var(--text-light)}.bd-module.open .bd-module-arrow{transform:rotate(180deg)}.bd-module-items{max-height:0;transition:max-height .3s;overflow:hidden}.bd-module.open .bd-module-items{max-height:500px}.bd-module-item{transition:var(--transition);border-top:1px solid #f3f4f6;align-items:center;gap:10px;padding:10px 16px 10px 60px;display:flex}.bd-module-item.free{cursor:pointer}.bd-module-item.free:hover{background:#f0fdf4}.bd-module-item.locked{opacity:.55}.bd-item-icon{border-radius:6px;flex-shrink:0;justify-content:center;align-items:center;width:28px;height:28px;display:flex}.bd-item-icon svg{width:16px;height:16px}.bd-item-icon.instruction{background:#e8f5e9}.bd-item-icon.instruction svg{stroke:var(--primary)}.bd-item-icon.video{background:#fef2f2}.bd-item-icon.video svg{stroke:#dc2626}.bd-item-icon.homework{background:#fff7ed}.bd-item-icon.homework svg{stroke:#f59e0b}.bd-item-icon.quiz-instruction{background:#f3e8ff}.bd-item-icon.quiz-instruction svg{stroke:#7c3aed}.bd-item-icon.quiz{background:#eff6ff}.bd-item-icon.quiz svg{stroke:#2563eb}.bd-item-label{color:var(--text-dark);flex:1;font-size:.78rem;font-weight:600}.bd-item-lock{flex-shrink:0;width:20px;height:20px}.bd-item-lock svg{width:16px;height:16px;stroke:var(--text-light)}.bd-item-free-badge{color:#15803d;background:#dcfce7;border-radius:4px;flex-shrink:0;align-items:center;gap:3px;padding:2px 8px;font-size:.6rem;font-weight:800;display:flex}.bd-item-free-badge svg{stroke:#15803d;width:12px;height:12px}.bd-sidebar{position:sticky;top:76px}.bd-price-card{background:var(--white);border:1px solid var(--border);border-radius:var(--radius-lg);box-shadow:var(--shadow-md);padding:22px}.bd-price-display{align-items:baseline;gap:10px;margin-bottom:8px;display:flex}.bd-price-final{color:var(--primary-dark);font-size:1.8rem;font-weight:900}.bd-price-was{color:var(--text-light);font-size:1rem;font-weight:600;text-decoration:line-through}.bd-price-save{color:#92400e;border-radius:var(--radius-sm);background:#fef3c7;align-items:center;gap:6px;margin-bottom:16px;padding:8px 12px;font-size:.78rem;font-weight:700;display:flex}.bd-price-save svg{stroke:currentColor;width:16px;height:16px}.bd-buy-btn{width:100%;color:var(--white);background:linear-gradient(135deg,var(--primary),var(--primary-dark));border-radius:var(--radius-md);cursor:pointer;transition:var(--transition);border:none;justify-content:center;align-items:center;gap:8px;padding:14px 20px;font-family:inherit;font-size:.95rem;font-weight:800;display:flex;box-shadow:0 4px 16px #0d6b3f4d}.bd-buy-btn svg{stroke:currentColor;width:20px;height:20px}.bd-buy-btn:hover:not(.in-cart){transform:translateY(-2px);box-shadow:0 8px 24px #0d6b3f59}.bd-buy-btn.in-cart{color:#15803d;box-shadow:none;cursor:default;background:#dcfce7}.bd-buy-btn.in-cart svg{stroke:#15803d}.bd-checkout-link{text-align:center;color:var(--primary);transition:var(--transition);margin-top:8px;padding:10px;font-size:.82rem;font-weight:700;text-decoration:none;display:block}.bd-checkout-link:hover{color:var(--primary-dark)}.bd-features-list{border-top:1px solid var(--border);margin-top:20px;padding-top:16px}.bd-features-list h4{color:var(--text-dark);margin-bottom:12px;font-size:.82rem;font-weight:700}.bd-feature-item{color:var(--text-muted);align-items:center;gap:8px;padding:6px 0;font-size:.78rem;display:flex}.bd-feature-item svg{stroke:#22c55e;flex-shrink:0;width:16px;height:16px}@media (max-width:768px){.bd-container{grid-template-columns:1fr}.bd-sidebar{position:static}.bd-header-info h1{font-size:1.1rem}}@media (max-width:480px){.bd-container{padding:16px 12px 40px}.bd-module-item{padding-left:44px}}