.banner-box{position:relative}.banner-box .word-box{position:absolute;top:0;bottom:0;left:20px;display:flex;flex-direction:column;justify-content:center;width:100%}.banner-box .title{font-weight:bold;font-size:26px;color:#333333}.banner-box p{font-weight:500;font-size:15px;color:#606162}.video-container{display:flex;min-height:60vh;margin:0 auto;box-shadow:0 10px 30px rgba(0,0,0,0.3);border-radius:15px;overflow:hidden;background:rgba(255,255,255,0.95);padding:0}.nav-list{width:300px;background:linear-gradient(180deg, #2c3e50, #1a2530);color:#fff;padding:25px 0;overflow-y:auto;position:relative}.nav-list::before{content:"";position:absolute;top:0;left:0;right:0;height:60px;background:linear-gradient(to bottom, #2c3e50, rgba(44,62,80,0));z-index:1}.nav-list::after{content:"";position:absolute;bottom:0;left:0;right:0;height:60px;background:linear-gradient(to top, #2c3e50, rgba(44,62,80,0));z-index:2}.nav-list li{list-style:none;padding:0;transition:all 0.3s ease;border-left:4px solid transparent;position:relative;z-index:1}.nav-list li.active{background-color:rgba(255,255,255,0.1);border-left:4px solid #3498db}.nav-list-item{display:block;color:#ecf0f1;text-decoration:none;padding:14px 25px;font-size:16px;transition:all 0.3s ease;position:relative;display:flex;align-items:center}.nav-list-item i{margin-right:12px;font-size:18px;width:24px;text-align:center}.nav-list li:not(.active):hover .nav-list-item{background-color:rgba(255,255,255,0.05);padding-left:28px}.content-section{flex:1;padding:30px;overflow-y:auto;background-color:#fff;position:relative}.content-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px;padding-bottom:15px;border-bottom:2px solid #3498db}.content-title{color:#2c3e50;font-size:28px;font-weight:700}.search-box{position:relative;width:300px}.search-box input{width:100%;padding:10px 15px 10px 40px;border:2px solid #ddd;border-radius:30px;font-size:16px;transition:all 0.3s}.search-box input:focus{outline:none;border-color:#3498db;box-shadow:0 0 10px rgba(52,152,219,0.3)}.search-box i{position:absolute;left:15px;top:12px;color:#7f8c8d}.chapter-container{background:#fff;border-radius:8px;overflow:hidden;box-shadow:0 4px 15px rgba(0,0,0,0.08);margin-bottom:25px;border:1px solid #eee}.chapter{border-bottom:1px solid #eee}.chapter.expanded{background-color:#f8f9fa}.chapter-header{display:flex;justify-content:space-between;align-items:center;padding:18px 25px;cursor:pointer;transition:all 0.3s ease}.chapter-header:hover{background-color:#f0f7ff}.chapter-title{font-size:18px;font-weight:600;color:#2980b9;display:flex;align-items:center}.chapter-title i{margin-right:10px;color:#3498db}.chapter-icon{color:#3498db;transition:transform 0.3s ease}.chapter.expanded .chapter-icon{transform:rotate(180deg)}.subchapter-container{max-height:0;overflow:hidden;transition:max-height 0.4s ease}.chapter.expanded .subchapter-container{max-height:2000px}.subchapter{padding:15px 25px;background-color:rgba(52,152,219,0.05);border-bottom:1px solid #e1f0fa;transition:all 0.3s}.subchapter:hover{background-color:rgba(52,152,219,0.1)}.subchapter-pay{display:flex;align-items:center}.subchapter-icon{margin-right:15px;width:36px;height:36px;background:linear-gradient(135deg, #3498db, #2c3e50);border-radius:50%;display:flex;align-items:center;justify-content:center;color:white;font-size:14px;box-shadow:0 3px 6px rgba(0,0,0,0.1)}.subchapter-content{flex:1}.subchapter-title{font-weight:500;color:#2c3e50;font-size:16px}.subchapter-desc{color:#7f8c8d;font-size:14px;margin-top:5px}.subchapter-duration{color:#7f8c8d;font-weight:500;min-width:70px;text-align:center}.play-btn{padding:10px 20px;background:linear-gradient(135deg, #3498db, #2980b9);color:white;border:none;border-radius:30px;cursor:pointer;display:flex;align-items:center;transition:all 0.3s ease;font-weight:500;box-shadow:0 4px 10px rgba(52,152,219,0.3)}.play-btn:hover{background:linear-gradient(135deg, #2980b9, #1a5276);transform:translateY(-3px);box-shadow:0 6px 15px rgba(0,0,0,0.2)}.play-btn i{margin-right:8px;font-size:14px}.play-btn.no-play{background:#999;cursor:default}.play-btn.no-play:hover{background:#999}.hidden{display:none}.progress-bar{height:5px;background:#e0e0e0;border-radius:3px;margin-top:8px;overflow:hidden}.progress{height:100%;background:linear-gradient(to right, #3498db, #2ecc71);width:0%;transition:width 0.5s ease}@media (max-width: 992px){.container{flex-direction:column;height:auto}.nav-list{width:100%;max-height:300px}.content-section{padding:20px}.content-header{flex-direction:column;align-items:flex-start}.search-box{width:100%;margin-top:15px}}@media (max-width: 768px){.chapter-header{padding:15px 20px}.subchapter{padding:12px 15px}.play-btn{padding:8px 15px;font-size:14px}}@keyframes fadeIn{from{opacity:0;transform:translateY(20px)}to{opacity:1;transform:translateY(0)}}.fade-in{animation:fadeIn 0.6s ease forwards}.badge{display:inline-block;padding:3px 8px;border-radius:12px;font-size:12px;font-weight:bold;margin-left:10px}.badge-new{background:linear-gradient(to right, #ff9a9e, #fad0c4);color:#d35400}.badge-popular{background:linear-gradient(to right, #a1c4fd, #c2e9fb);color:#2980b9}@media (max-width: 1024px){.simple-dialog.dialog-video-play{width:100% !important;height:100% !important;top:0 !important;left:0 !important;transform:none !important}.simple-dialog-content{height:100% !important;display:flex;align-items:center;justify-content:center}#sp{width:100% !important;height:auto !important;max-height:80vh}}@media (max-width: 768px){.simple-dialog-remove{top:20px !important;right:20px !important}.dialog-video-play{position:fixed;top:50%;transform:translate(-50%, -50%);left:50%;z-index:999}}