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(width<=560px){.khoahoc-grid{grid-template-columns:1fr}.khoahoc-hero{padding:35px 15px 30px}}.course-detail-container{max-width:1200px;margin:110px auto 60px;padding:0 24px;font-family:Inter,sans-serif}.course-header-section{background-position:50%;background-size:cover;border-radius:24px;width:100%;height:400px;margin-bottom:30px;position:relative;overflow:hidden;box-shadow:0 10px 30px #0000001a}.course-info-header{margin-bottom:30px}.course-info-header h1{color:#1e293b;margin:15px 0;font-size:2.5rem;font-weight:800}.author-meta{color:#64748b;align-items:center;gap:15px;font-size:1rem;display:flex}.author-name strong{color:#1e293b}.course-level-tag{color:#94a3b8}.badge-new{color:#3b82f6;text-transform:uppercase;background:#eff6ff;border-radius:50px;padding:6px 16px;font-size:.85rem;font-weight:700;display:inline-block}.course-title-box{z-index:2;max-width:800px;position:relative}.course-title-box h1{color:#fff;margin:10px 0;font-size:2.8rem;font-weight:900}.author-info{color:#ccc;font-size:1.1rem}.course-content-wrapper{grid-template-columns:2fr 1fr;gap:40px;display:grid}h2{color:#1a1a1a;align-items:center;gap:10px;margin-bottom:20px;font-size:1.5rem;display:flex}h2:before{content:"";background:#3b82f6;border-radius:2px;width:4px;height:24px}.course-intro{color:#444;margin-bottom:40px;line-height:1.8}.video-player-section{background:#000;border-radius:20px;margin-bottom:40px;overflow:hidden;box-shadow:0 10px 40px #0000004d}.video-container{aspect-ratio:16/9;background:#000;width:100%}.main-video{width:100%;height:100%;display:block}.video-info-bar{background:#111;border-top:1px solid #222;justify-content:space-between;align-items:center;padding:20px 30px;display:flex}.video-info-bar h3{color:#eee;margin:0;font-size:1.1rem;font-weight:600}.btn-close-player{color:#fff;cursor:pointer;background:#ffffff1a;border:none;border-radius:6px;padding:8px 16px;font-size:.85rem;transition:background .2s}.btn-close-player:hover{background:#fff3}.lesson-item{cursor:pointer;border-bottom:1px solid #f5f5f5;align-items:center;padding:18px 20px;transition:all .2s;display:flex}.lesson-item.locked{cursor:not-allowed;opacity:.7}.lesson-item:hover:not(.locked){background:#f0f7ff}.lesson-item.active{background:#eff6ff;border-left:4px solid #3b82f6;padding-left:16px}.lesson-num{color:#94a3b8;width:35px;font-size:.9rem;font-weight:700}.lesson-text{color:#1e293b;flex:1;font-size:.95rem;font-weight:600}.lesson-status{color:#3b82f6;font-size:.85rem;font-weight:600}.lesson-item.locked .lesson-status{color:#94a3b8}.lesson-item.active .lesson-status{color:#2563eb;font-style:italic}.download-card{background:#fff;border:1px solid #eee;border-radius:16px;padding:24px;position:sticky;top:110px;box-shadow:0 4px 20px #0000000d}.download-card h3{margin-top:0;margin-bottom:12px;font-size:1.2rem}.download-desc{color:#666;margin-bottom:20px;font-size:.9rem}.lock-area{text-align:center;background:#f8fafc;border:1px dashed #cbd5e1;border-radius:12px;margin-bottom:20px;padding:30px 20px}.lock-icon{margin-bottom:10px;font-size:2.5rem}.lock-area p{color:#64748b;margin-bottom:20px;font-size:.9rem}.btn-login-to-download{color:#fff;background:#1a1a2e;border-radius:8px;padding:12px;font-weight:700;text-decoration:none;transition:background .3s;display:block}.btn-login-to-download:hover{background:#16213e}.download-area{margin-bottom:20px}.success-msg{color:#059669;margin-bottom:15px;font-size:.9rem;font-weight:600}.btn-download-now{color:#fff;text-align:center;background:#3b82f6;border-radius:8px;padding:14px;font-weight:700;text-decoration:none;transition:transform .2s,box-shadow .2s;display:block}.btn-download-now:hover{transform:translateY(-2px);box-shadow:0 4px 12px #3b82f666}.course-stats{border-top:1px solid #f1f5f9;padding-top:15px}.stat-item{justify-content:space-between;margin-bottom:8px;font-size:.85rem;display:flex}.stat-item span{color:#94a3b8}.stat-item strong{color:#334155}@media (width<=900px){.course-content-wrapper{grid-template-columns:1fr}.course-banner{height:300px}.course-title-box h1{font-size:1.8rem}}.course-section{background:#fff;border:1px solid #0000000d;border-radius:12px;margin-bottom:12px;overflow:hidden;box-shadow:0 2px 8px #00000005}.section-header{background:#f8fafc;border-bottom:1px solid #f1f5f9;justify-content:space-between;align-items:center;padding:16px 20px;display:flex}.section-header-left{cursor:pointer;flex:1;align-items:center;gap:12px;min-width:0;display:flex}.section-header-right{flex-shrink:0;align-items:center;gap:12px;display:flex}.section-header:hover{background:#f1f5f9}.section-title{color:#1e293b;word-break:break-word;font-size:1rem;font-weight:700;line-height:1.4}.section-count{color:#64748b;white-space:nowrap;background:#e2e8f0;border-radius:20px;flex-shrink:0;padding:4px 10px;font-size:.75rem}.btn-resource-mini{color:#fff;background:#3b82f6;border-radius:6px;align-items:center;gap:6px;padding:6px 12px;font-size:.8rem;font-weight:600;text-decoration:none;transition:all .2s;display:flex}.btn-resource-mini:hover{color:#fff;background:#2563eb;box-shadow:0 2px 8px #2563eb4d}.toggle-icon{color:#94a3b8;font-size:.8rem}.section-content{background:#fff;display:none;overflow:hidden}.section-content.expanded{display:block}.sub-sections-container{background:#fcfcfc;border-left:2px solid #e2e8f0;margin-left:10px;padding-left:20px}.depth-1 .section-header{background:#fff;padding:12px 15px}.depth-1 .section-title{font-size:.95rem;font-weight:600}.depth-2 .section-header{background:#fafafa;padding:10px 15px}.section-content .lesson-item{background:#fff;border-bottom:1px solid #f8fafc;padding:15px 25px}.section-content .lesson-item:hover{background:#f0f9ff}.section-content .lesson-item:last-child{border-bottom:none}.flat-lessons{background:#fff;border:1px solid #0000000d;border-radius:12px;margin-bottom:20px;overflow:hidden;box-shadow:0 2px 8px #00000005}