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scale(1.05)}}.auth-card{animation:cardEntrance .8s cubic-bezier(.34,1.56,.64,1);background:linear-gradient(145deg,#fff,#f8f9fa);border:3px solid #ffffff4d;border-radius:30px;box-shadow:0 30px 80px #0000004d,inset 0 0 0 1px #fff3,0 10px 20px #667eea33;max-width:500px;padding:50px 40px;position:relative;transform-style:preserve-3d;transition:all .3s ease;width:100%;will-change:transform;z-index:1}@keyframes cardEntrance{0%{opacity:0;transform:translateY(50px) translateZ(-200px) rotateX(20deg) scale(.8)}to{opacity:1;transform:translateY(0) translateZ(0) rotateX(0deg) scale(1)}}.auth-card:before{animation:gradientShift 4s ease infinite;background:linear-gradient(135deg,#0096c7,#99c2f8,#54cce7,#0096c7);background-size:300% 300%;border-radius:30px;bottom:-2px;content:"";filter:blur(10px);left:-2px;position:absolute;right:-2px;top:-2px;z-index:-1}@keyframes gradientShift{0%,to{background-position:0 50%}50%{background-position:100% 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spin-loader{to{transform:rotate(1turn)}}.header{background:linear-gradient(135deg,#667eea,#764ba2);box-shadow:0 4px 6px #0000001a;color:#fff;padding:2rem 1rem;text-align:center}.header-content{margin:0 auto;max-width:1200px}.header-title{font-size:2.5rem;font-weight:700;margin:0;text-shadow:2px 2px 4px #0003}.header-subtitle{font-size:1.1rem;margin:.5rem 0 0;opacity:.9}@media (max-width:768px){.header-title{font-size:2rem}.header-subtitle{font-size:.95rem}}.search-bar-container{margin:2rem auto;max-width:1200px;padding:0 1rem}.search-bar{align-items:center;background:#fff;border-radius:50px;box-shadow:0 4px 12px #0000001a;display:flex;padding:.75rem 1.5rem;position:relative;transition:box-shadow .3s ease}.search-bar:focus-within{box-shadow:0 6px 20px #667eea4d}.search-icon{color:#667eea;font-size:1.2rem;margin-right:.75rem}.search-input{background:#0000;border:none;color:#333;flex:1 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(max-width:480px){.subject-grid{grid-template-columns:1fr}}.video-player-container{margin:2rem auto;max-width:1200px;padding:0 1rem 2rem}.video-section-title{color:#333;font-size:1.75rem;font-weight:700;margin:0 0 1.5rem;text-align:center}.video-player-wrapper{grid-gap:1.5rem;background:#fff;border-radius:16px;box-shadow:0 4px 12px #0000001a;display:grid;gap:1.5rem;grid-template-columns:1fr 350px;overflow:hidden}.video-main{padding:1.5rem}.video-element{background:#000;border-radius:12px;max-height:500px;width:100%}.video-info{margin-top:1.5rem}.video-title{color:#333;font-size:1.5rem;font-weight:600;margin:0 0 1rem}.progress-container{margin:1.5rem 0}.progress-bar-wrapper{background:#e0e0e0;border-radius:5px;height:10px;margin-bottom:.75rem;overflow:hidden;width:100%}.progress-bar{background:linear-gradient(90deg,#667eea,#764ba2);border-radius:5px;height:100%;transition:width .3s 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