:root{--primary: #00d4ff;--primary-light: #00ffff;--primary-dark: #0088aa;--primary-gradient: linear-gradient(135deg, #00d4ff, #8a2be2);--primary-glow: 0 0 30px rgba(0, 212, 255, .35);--bg-primary: #050505;--bg-secondary: #0a0a0a;--bg-dark: #000000;--bg-glass: rgba(20, 20, 20, .6);--text-primary: #ffffff;--text-secondary: #9ca3af;--text-muted: #6b7280;--text-white: #ffffff;--border-color: rgba(255, 255, 255, .08);--card-shadow: 0 8px 32px 0 rgba(0, 0, 0, .3);--card-hover-shadow: 0 12px 24px rgba(0, 212, 255, .2);--radius-sm: 8px;--radius-md: 12px;--radius-lg: 16px;--radius-xl: 24px;--transition-fast: .2s ease;--transition-normal: .3s cubic-bezier(.25, .8, .25, 1);--transition-slow: .5s cubic-bezier(.4, 0, .2, 1);--font-primary: "Inter", system-ui, -apple-system, sans-serif;--font-secondary: "Plus Jakarta Sans", sans-serif;--container-max: 1280px;--navbar-height: 70px}.glass-panel{background:var(--bg-glass);backdrop-filter:blur(12px);-webkit-backdrop-filter:blur(12px);border:1px solid var(--border-color);border-radius:var(--radius-lg);box-shadow:var(--card-shadow)}.hover-glow{transition:all var(--transition-normal)}.hover-glow:hover{transform:translateY(-4px);box-shadow:var(--card-hover-shadow);border-color:#00d4ff66}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}html{scroll-behavior:smooth;-webkit-text-size-adjust:100%;font-size:16px}body{font-family:var(--font-primary);color:var(--text-primary);background:var(--bg-primary);line-height:1.7;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;text-rendering:optimizeLegibility;overflow-x:hidden;scrollbar-width:none;-ms-overflow-style:none}body::-webkit-scrollbar{display:none}img{max-width:100%;height:auto;display:block}a{text-decoration:none;color:inherit;transition:color var(--transition-fast)}ul,ol{list-style:none}button,input,textarea,select{font-family:inherit;font-size:inherit;border:none;outline:none;background:none}button{cursor:pointer}.loading-overlay{position:fixed;top:0;right:0;bottom:0;left:0;z-index:9999;display:flex;align-items:center;justify-content:center;background:var(--bg-primary);opacity:0;visibility:hidden;transition:opacity .5s ease,visibility .5s ease}.loading-overlay.active{opacity:1;visibility:visible}.loading-spinner{width:56px;height:56px;border:4px solid var(--border-color);border-top-color:var(--primary);border-right-color:var(--primary-light);border-radius:50%;animation:spinLoader .8s linear infinite}@keyframes spinLoader{to{transform:rotate(360deg)}}h1,h2,h3,h4,h5,h6{font-family:var(--font-primary);font-weight:700;line-height:1.25;color:var(--text-primary);margin-bottom:.5em}h1{font-size:3.5rem;letter-spacing:-1.5px}h2{font-size:2.75rem;letter-spacing:-1px}h3{font-size:2rem}h4{font-size:1.5rem}h5{font-size:1.25rem}h6{font-size:1rem}p{margin-bottom:1em;color:var(--text-secondary)}.text-gradient{background:var(--primary-gradient);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.text-gradient-wide{background:linear-gradient(135deg,purple,#c060c0,purple);background-size:200% auto;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:shimmer 3s linear infinite}.container{width:100%;max-width:var(--container-max);margin:0 auto;padding:0 24px}.grid-2{display:grid;grid-template-columns:repeat(2,1fr);gap:24px}.grid-3{display:grid;grid-template-columns:repeat(3,1fr);gap:24px}.grid-4{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}.flex-center{display:flex;align-items:center;justify-content:center}.flex-between{display:flex;align-items:center;justify-content:space-between}.navbar{position:fixed;top:0;left:0;right:0;height:var(--navbar-height);background:#0a0a0ad9;backdrop-filter:blur(16px);-webkit-backdrop-filter:blur(16px);box-shadow:0 1px 12px #00d4ff0f;z-index:1000;transition:box-shadow var(--transition-normal),background var(--transition-normal)}.navbar.scrolled{box-shadow:0 4px 24px #00d4ff1a}.navbar-inner{display:flex;align-items:center;justify-content:space-between;height:100%;max-width:var(--container-max);margin:0 auto;padding:0 24px}.navbar-logo img{width:160px;height:auto;transition:transform var(--transition-fast)}.navbar-logo:hover img{transform:scale(1.03)}.nav-links{display:flex;align-items:center;gap:8px}.nav-link{position:relative;padding:8px 16px;font-size:.95rem;font-weight:500;color:var(--text-secondary);border-radius:var(--radius-sm);transition:color var(--transition-fast),background var(--transition-fast)}.nav-link:hover,.nav-link.active{color:var(--primary);background:#00d4ff0f}.nav-link:after{content:"";position:absolute;bottom:2px;left:50%;width:0;height:2px;background:var(--primary-gradient);border-radius:2px;transform:translate(-50%);transition:width var(--transition-normal)}.nav-link:hover:after,.nav-link.active:after{width:60%}.nav-cta{margin-left:12px;padding:10px 24px;background:var(--primary-gradient);color:var(--text-white)!important;border-radius:var(--radius-xl);font-weight:600;font-size:.9rem;box-shadow:0 4px 16px #00d4ff40;transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.nav-cta:hover{transform:translateY(-2px);box-shadow:0 8px 28px #00d4ff59}.nav-cta:after{display:none}.nav-toggle{display:none;flex-direction:column;justify-content:center;gap:5px;width:32px;height:32px;cursor:pointer;z-index:1001}.nav-toggle span{display:block;width:100%;height:2.5px;background:var(--text-primary);border-radius:4px;transition:transform var(--transition-normal),opacity var(--transition-fast)}.nav-toggle.active span:nth-child(1){transform:translateY(7.5px) rotate(45deg)}.nav-toggle.active span:nth-child(2){opacity:0}.nav-toggle.active span:nth-child(3){transform:translateY(-7.5px) rotate(-45deg)}.hero-section{position:relative;min-height:90vh;display:flex;align-items:center;justify-content:center;text-align:center;padding:120px 24px 80px;background:linear-gradient(165deg,#1a0a1a,#400040 40%,purple,#b040b0);overflow:hidden}.hero-section:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 20% 30%,rgba(160,32,160,.35) 0%,transparent 50%),radial-gradient(circle at 80% 70%,rgba(176,64,176,.25) 0%,transparent 50%);pointer-events:none}.hero-section:after{content:"";position:absolute;bottom:-2px;left:0;right:0;height:120px;background:linear-gradient(to top,var(--bg-primary),transparent);pointer-events:none}.hero-content{position:relative;z-index:2;max-width:860px}.hero-tag{display:inline-block;padding:6px 20px;background:#ffffff1f;border:1px solid rgba(255,255,255,.2);border-radius:var(--radius-xl);color:#ffffffe6;font-size:.85rem;font-weight:500;margin-bottom:24px;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.hero-title{font-size:4rem;font-weight:800;color:var(--text-white);line-height:1.15;margin-bottom:20px;letter-spacing:-2px;animation:fadeInUp .8s ease forwards}.hero-title span{background:linear-gradient(135deg,#e0b0ff,#fff,#e0b0ff);background-size:200% auto;-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;animation:shimmer 4s linear infinite}.hero-subtitle{font-size:1.2rem;color:#ffffffbf;max-width:600px;margin:0 auto 40px;font-weight:400;line-height:1.7;animation:fadeInUp .8s ease .15s forwards;opacity:0}.hero-cta-group{display:flex;align-items:center;justify-content:center;gap:16px;margin-bottom:56px;animation:fadeInUp .8s ease .3s forwards;opacity:0}.hero-cta-btn{display:inline-flex;align-items:center;gap:10px;padding:16px 40px;background:var(--text-white);color:var(--primary);font-weight:700;font-size:1.05rem;border-radius:var(--radius-xl);box-shadow:0 8px 32px #0003;transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.hero-cta-btn:hover{transform:translateY(-3px) scale(1.03);box-shadow:0 12px 44px #0000004d,var(--primary-glow)}.hero-cta-btn-outline{display:inline-flex;align-items:center;gap:10px;padding:16px 40px;background:transparent;color:var(--text-white);font-weight:600;font-size:1.05rem;border:2px solid rgba(255,255,255,.35);border-radius:var(--radius-xl);transition:all var(--transition-fast)}.hero-cta-btn-outline:hover{background:#ffffff1a;border-color:#fff9;transform:translateY(-2px)}.hero-stats{display:flex;align-items:center;justify-content:center;gap:48px;animation:fadeInUp .8s ease .45s forwards;opacity:0}.hero-stat{text-align:center}.hero-stat-value{display:block;font-size:2rem;font-weight:800;color:var(--text-white)}.hero-stat-label{font-size:.85rem;color:#fff9;font-weight:400}.hero-stat+.hero-stat{position:relative}.hero-stat+.hero-stat:before{content:"";position:absolute;left:-24px;top:50%;transform:translateY(-50%);width:1px;height:40px;background:#fff3}.hero-shape{position:absolute;border-radius:50%;background:#b040b026;animation:heroFloat 6s ease-in-out infinite;pointer-events:none}.hero-shape:nth-child(1){width:300px;height:300px;top:-50px;right:-80px;animation-delay:0s}.hero-shape:nth-child(2){width:200px;height:200px;bottom:60px;left:-60px;animation-delay:-2s}.hero-shape:nth-child(3){width:120px;height:120px;top:30%;right:15%;animation-delay:-4s}@keyframes heroFloat{0%,to{transform:translateY(0) rotate(0)}33%{transform:translateY(-20px) rotate(5deg)}66%{transform:translateY(10px) rotate(-3deg)}}.course-card{position:relative;background:var(--bg-primary);border-radius:var(--radius-lg);overflow:hidden;box-shadow:var(--card-shadow);border:1px solid var(--border-color);transition:transform var(--transition-normal),box-shadow var(--transition-normal)}.course-card:hover{transform:translateY(-8px);box-shadow:var(--card-hover-shadow)}.course-card-img{position:relative;aspect-ratio:16 / 9;overflow:hidden}.course-card-img img{width:100%;height:100%;object-fit:cover;transition:transform .5s ease}.course-card:hover .course-card-img img{transform:scale(1.08)}.course-card-badge{position:absolute;top:12px;left:12px;padding:4px 14px;background:var(--primary-gradient);color:var(--text-white);font-size:.75rem;font-weight:600;border-radius:var(--radius-xl);z-index:2;letter-spacing:.5px;text-transform:uppercase}.course-card-badge--free{background:linear-gradient(135deg,#10b981,#059669)}.course-card-body{padding:20px}.course-card-title{font-size:1.05rem;font-weight:600;color:var(--text-primary);margin-bottom:10px;line-height:1.4;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.course-card-meta{display:flex;align-items:center;gap:16px;font-size:.82rem;color:var(--text-muted);margin-bottom:14px}.course-card-meta span{display:flex;align-items:center;gap:5px}.course-card-rating{display:flex;align-items:center;gap:4px;margin-bottom:14px}.course-card-rating .stars{color:#f59e0b;font-size:.85rem}.course-card-rating .rating-count{font-size:.8rem;color:var(--text-muted)}.course-card-footer{display:flex;align-items:center;justify-content:space-between;padding-top:14px;border-top:1px solid var(--border-color)}.course-card-price{display:flex;align-items:baseline;gap:8px}.course-card-price .price-current{font-size:1.25rem;font-weight:700;color:var(--primary)}.course-card-price .price-original{font-size:.85rem;color:var(--text-muted);text-decoration:line-through}.course-card-price .price-free{font-size:1.1rem;font-weight:700;color:#10b981}.course-card-action{padding:8px 18px;background:#00d4ff14;color:var(--primary);font-size:.82rem;font-weight:600;border-radius:var(--radius-sm);transition:all var(--transition-fast)}.course-card-action:hover{background:var(--primary);color:var(--text-white)}.course-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(280px,1fr));gap:24px}.courses-section{padding:80px 0}.courses-filter{display:flex;align-items:center;gap:10px;margin-bottom:40px;flex-wrap:wrap}.filter-btn{padding:8px 22px;border-radius:var(--radius-xl);font-size:.88rem;font-weight:500;color:var(--text-secondary);background:var(--bg-secondary);border:1px solid transparent;transition:all var(--transition-fast)}.filter-btn:hover{color:var(--primary);background:#00d4ff14;border-color:#00d4ff26}.filter-btn.active{color:var(--text-white);background:var(--primary-gradient);border-color:transparent;box-shadow:0 4px 16px #00d4ff40}.video-container{position:relative;width:100%;padding-top:56.25%;border-radius:var(--radius-lg);overflow:hidden;background:#000;box-shadow:0 8px 40px #00000040}.video-container iframe,.video-container video{position:absolute;top:0;left:0;width:100%;height:100%;border:none}.video-overlay{position:absolute;top:0;right:0;bottom:0;left:0;display:flex;align-items:center;justify-content:center;background:#00000059;cursor:pointer;transition:background var(--transition-fast);z-index:2}.video-overlay:hover{background:#0003}.video-play-btn{width:72px;height:72px;background:var(--primary-gradient);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 32px #00d4ff66;transition:transform var(--transition-fast),box-shadow var(--transition-fast)}.video-play-btn:after{content:"";display:block;width:0;height:0;border-style:solid;border-width:12px 0 12px 22px;border-color:transparent transparent transparent white;margin-left:4px}.video-overlay:hover .video-play-btn{transform:scale(1.1);box-shadow:0 12px 44px #00d4ff8c}.curriculum-section{padding:80px 0}.curriculum-module{border:1px solid var(--border-color);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden;background:var(--bg-primary);transition:box-shadow var(--transition-normal)}.curriculum-module:hover{box-shadow:var(--card-shadow)}.curriculum-header{display:flex;align-items:center;justify-content:space-between;padding:18px 24px;background:var(--bg-secondary);cursor:pointer;transition:background var(--transition-fast);-webkit-user-select:none;user-select:none}.curriculum-header:hover{background:#f0eaff}.curriculum-header.active{background:#ece4ff;border-bottom:1px solid var(--border-color)}.curriculum-header-left{display:flex;align-items:center;gap:14px}.curriculum-module-number{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:var(--primary-gradient);color:var(--text-white);font-size:.8rem;font-weight:700;border-radius:50%;flex-shrink:0}.curriculum-module-title{font-size:.95rem;font-weight:600;color:var(--text-primary)}.curriculum-module-meta{font-size:.8rem;color:var(--text-muted)}.curriculum-chevron{width:20px;height:20px;display:flex;align-items:center;justify-content:center;transition:transform var(--transition-normal);color:var(--text-muted);flex-shrink:0}.curriculum-header.active .curriculum-chevron{transform:rotate(180deg);color:var(--primary)}.curriculum-content{max-height:0;overflow:hidden;transition:max-height .45s cubic-bezier(.4,0,.2,1)}.curriculum-content.active{max-height:2000px}.curriculum-content::-webkit-scrollbar{width:4px}.curriculum-content::-webkit-scrollbar-track{background:var(--bg-secondary)}.curriculum-content::-webkit-scrollbar-thumb{background:#00d4ff4d;border-radius:4px}.curriculum-lecture{display:flex;align-items:center;gap:14px;padding:14px 24px 14px 70px;border-bottom:1px solid var(--border-color);transition:background var(--transition-fast);cursor:pointer}.curriculum-lecture:last-child{border-bottom:none}.curriculum-lecture:hover{background:#00d4ff08}.curriculum-lecture-icon{width:28px;height:28px;display:flex;align-items:center;justify-content:center;color:var(--primary);flex-shrink:0;font-size:.85rem}.curriculum-lecture-title{flex:1;font-size:.9rem;color:var(--text-secondary)}.curriculum-lecture-duration{font-size:.8rem;color:var(--text-muted);flex-shrink:0}.testimonials-section{padding:80px 0;background:var(--bg-secondary);overflow:hidden}.testimonial-carousel{overflow:hidden;position:relative}.testimonial-track{display:flex;transition:transform .5s cubic-bezier(.4,0,.2,1);gap:24px}.testimonial-card{min-width:calc(33.333% - 16px);padding:32px;background:var(--bg-primary);border-radius:var(--radius-lg);box-shadow:var(--card-shadow);border:1px solid var(--border-color);flex-shrink:0;transition:transform var(--transition-normal),box-shadow var(--transition-normal)}.testimonial-card:hover{transform:translateY(-4px);box-shadow:var(--card-hover-shadow)}.testimonial-header{display:flex;align-items:center;gap:14px;margin-bottom:18px}.testimonial-img{width:60px;height:60px;border-radius:50%;object-fit:cover;border:3px solid rgba(0,212,255,.15)}.testimonial-info{flex:1}.testimonial-name{font-size:1rem;font-weight:600;color:var(--text-primary)}.testimonial-role{font-size:.82rem;color:var(--text-muted)}.testimonial-stars{color:#f59e0b;font-size:.9rem;margin-bottom:12px}.testimonial-text{font-size:.95rem;font-style:italic;color:var(--text-secondary);line-height:1.7}.testimonial-text:before{content:'"';font-size:2rem;color:var(--primary-light);font-family:Georgia,serif;line-height:0;vertical-align:-.3em;margin-right:4px}.testimonial-nav{display:flex;align-items:center;justify-content:center;gap:10px;margin-top:32px}.testimonial-dot{width:10px;height:10px;border-radius:50%;background:var(--border-color);border:none;cursor:pointer;transition:all var(--transition-fast)}.testimonial-dot:hover{background:var(--primary-light);transform:scale(1.2)}.testimonial-dot.active{width:32px;border-radius:6px;background:var(--primary-gradient)}.testimonial-arrows{display:flex;gap:10px}.testimonial-arrow{width:44px;height:44px;border-radius:50%;background:var(--bg-primary);border:1px solid var(--border-color);display:flex;align-items:center;justify-content:center;cursor:pointer;font-size:1.1rem;color:var(--text-secondary);transition:all var(--transition-fast)}.testimonial-arrow:hover{background:var(--primary);color:var(--text-white);border-color:var(--primary)}.faq-section{padding:80px 0}.faq-list{max-width:800px;margin:0 auto}.faq-item{border:1px solid var(--border-color);border-radius:var(--radius-md);margin-bottom:12px;overflow:hidden;background:var(--bg-primary);transition:box-shadow var(--transition-normal)}.faq-item:hover{box-shadow:var(--card-shadow)}.faq-question{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;cursor:pointer;font-weight:600;font-size:1rem;color:var(--text-primary);transition:color var(--transition-fast);-webkit-user-select:none;user-select:none}.faq-question:hover{color:var(--primary)}.faq-question:after{content:"+";font-size:1.5rem;font-weight:300;color:var(--primary);transition:transform var(--transition-normal);flex-shrink:0;width:28px;height:28px;display:flex;align-items:center;justify-content:center}.faq-question.active:after{content:"−";transform:rotate(180deg)}.faq-answer{max-height:0;overflow:hidden;transition:max-height .4s cubic-bezier(.4,0,.2,1),padding .3s ease;padding:0 24px}.faq-answer.active{max-height:500px;padding:0 24px 20px}.faq-answer p{font-size:.95rem;color:var(--text-secondary);line-height:1.7}.section-header{text-align:center;margin-bottom:56px}.section-tag{display:inline-block;padding:6px 18px;background:#00d4ff14;color:var(--primary);font-size:.8rem;font-weight:600;border-radius:var(--radius-xl);margin-bottom:14px;letter-spacing:.5px;text-transform:uppercase}.section-title{font-size:2.5rem;font-weight:700;color:var(--text-primary);margin-bottom:14px}.section-subtitle{font-size:1.05rem;color:var(--text-muted);max-width:560px;margin:0 auto;line-height:1.7}.features-section{padding:80px 0}.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:32px}.feature-card{text-align:center;padding:40px 28px;background:var(--bg-primary);border:1px solid var(--border-color);border-radius:var(--radius-lg);transition:transform var(--transition-normal),box-shadow var(--transition-normal)}.feature-card:hover{transform:translateY(-6px);box-shadow:var(--card-hover-shadow)}.feature-icon{width:64px;height:64px;margin:0 auto 20px;display:flex;align-items:center;justify-content:center;background:#00d4ff1a;border-radius:50%;font-size:1.5rem;color:var(--primary);transition:background var(--transition-fast),transform var(--transition-fast)}.feature-card:hover .feature-icon{background:var(--primary-gradient);color:var(--text-white);transform:scale(1.1)}.feature-title{font-size:1.15rem;font-weight:600;color:var(--text-primary);margin-bottom:10px}.feature-desc{font-size:.9rem;color:var(--text-muted);line-height:1.6}.stats-bar{display:flex;align-items:center;justify-content:space-around;background:var(--primary-gradient);color:var(--text-white);border-radius:var(--radius-xl);padding:40px 32px;margin:0 auto;max-width:var(--container-max);box-shadow:0 12px 48px #00d4ff40;position:relative;overflow:hidden}.stats-bar:before{content:"";position:absolute;top:0;right:0;bottom:0;left:0;background:radial-gradient(circle at 10% 50%,rgba(255,255,255,.1) 0%,transparent 50%),radial-gradient(circle at 90% 50%,rgba(255,255,255,.08) 0%,transparent 50%);pointer-events:none}.stat-item{text-align:center;position:relative;z-index:1}.stat-value{display:block;font-size:2.25rem;font-weight:800;line-height:1.2}.stat-label{font-size:.85rem;opacity:.8;font-weight:400;margin-top:4px}.course-hero{display:flex;align-items:flex-start;gap:48px;padding:calc(var(--navbar-height) + 40px) 0 60px}.course-info{flex:1;padding-right:20px}.course-video-wrapper{flex:1;position:sticky;top:calc(var(--navbar-height) + 24px)}.course-detail-breadcrumb{font-size:.85rem;color:var(--text-muted);margin-bottom:16px}.course-detail-breadcrumb a{color:var(--primary)}.course-detail-breadcrumb a:hover{text-decoration:underline}.course-detail-title{font-size:2.2rem;font-weight:700;color:var(--text-primary);line-height:1.3;margin-bottom:16px}.course-detail-subtitle{font-size:1.05rem;color:var(--text-secondary);margin-bottom:20px;line-height:1.6}.course-detail-meta{display:flex;align-items:center;gap:20px;margin-bottom:24px;flex-wrap:wrap}.course-detail-meta-item{display:flex;align-items:center;gap:6px;font-size:.88rem;color:var(--text-secondary)}.course-detail-price{display:flex;align-items:baseline;gap:12px;margin-bottom:24px}.course-detail-price .price-current{font-size:2rem;font-weight:800;color:var(--primary)}.course-detail-price .price-original{font-size:1.15rem;color:var(--text-muted);text-decoration:line-through}.course-detail-price .price-discount{padding:4px 12px;background:#10b9811a;color:#059669;font-size:.82rem;font-weight:600;border-radius:var(--radius-sm)}.enroll-btn{display:flex;align-items:center;justify-content:center;gap:10px;width:100%;padding:18px 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h3{font-size:20px;font-weight:700}.help-close{background:#ffffff1a;border:1px solid rgba(255,255,255,.15);color:#fff;cursor:pointer;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;transition:all .3s}.help-close:hover{background:#ffffff40;transform:scale(1.15) rotate(90deg)}.help-row{display:flex;justify-content:space-between;align-items:center;padding:14px 0;border-bottom:1px solid rgba(255,255,255,.08);font-size:14px}.help-row:last-child{border-bottom:none}.help-key{background:#ffffff26;padding:6px 14px;border-radius:8px;font-size:12px;font-weight:700;font-family:monospace;border:1px solid rgba(255,255,255,.1)}@media (max-width: 768px){.player-header{padding:12px;flex-direction:column;gap:10px;align-items:flex-start}.player-course-title{font-size:1rem;white-space:nowrap;overflow:hidden;text-overflow:ellipsis;max-width:100%}.player-video-section{padding:10px}.video-wrapper{border-radius:8px}.ctrl-overlay{left:10px;right:10px;bottom:10px;padding:10px}.cb{width:34px;height:34px}.cb svg{width:18px;height:18px}.time-txt{display:none}.vol-wrap:hover .vol-range{width:60px}.q-menu,.spd-menu{right:10px;bottom:70px;padding:6px}.spd-menu{right:60px}.dt-ripple{width:140px;height:140px}.dt-left .dt-ripple{left:-30px}.dt-right .dt-ripple{right:-30px}.dt-icon{font-size:18px}.dt-icon svg{width:18px;height:18px}.big-play-circle{width:64px;height:64px}.big-play-circle svg{width:28px;height:28px}.player-controls{padding:16px;flex-direction:column!important;align-items:flex-start!important;gap:16px;margin-top:16px}#mark-done-btn{width:100%;text-align:center}.player-controls h2{font-size:1.25rem}.sidebar-header{padding:16px}.sidebar-module-header{padding:12px 16px}.sidebar-lecture-btn{padding:12px 16px;font-size:.85rem}}