:root{color-scheme:dark;--color-brand-primary: #8b5cf6;--color-brand-secondary: #06b6d4;--color-brand-accent: #38bdf8;--color-success: #10b981;--color-warning: #f59e0b;--color-error: #f43f5e;--color-danger: var(--color-error);--font-heading: "Outfit", sans-serif;--font-body: "Inter", sans-serif;--space-1: 4px;--space-2: 8px;--space-3: 16px;--space-4: 24px;--space-5: 32px;--space-6: 48px;--border-radius: 8px;--border-radius-lg: 16px;--bg-primary: #0F0C29;--bg-secondary: #1A1638;--bg-tertiary: #241E4D;--text-main: #FFFFFF;--text-muted: #94A3B8;--text-inverse: #0F172A;--border-color: rgba(139, 92, 246, .2);--glass-bg: rgba(26, 22, 56, .7);--glass-border: rgba(139, 92, 246, .2);--glass-shadow: 0 8px 32px 0 rgba(0, 0, 0, .5);--color-bg: var(--bg-primary);--color-card: var(--bg-secondary);--color-text: var(--text-main);--color-muted: var(--text-muted);--color-accent: var(--color-brand-accent);--color-primary: var(--color-brand-primary);--color-border: var(--border-color);--color-input-bg: var(--bg-tertiary)}[data-theme=light]{color-scheme:light;--bg-primary: #F0F4F8;--bg-secondary: #FFFFFF;--bg-tertiary: #E2E8F0;--text-main: #0F172A;--text-muted: #64748B;--text-inverse: #FFFFFF;--border-color: #CBD5E1;--glass-bg: rgba(255, 255, 255, .9);--glass-border: rgba(148, 163, 184, .3);--glass-shadow: 0 4px 6px -1px rgba(0, 0, 0, .1);--color-accent: #0891b2;--color-primary: #7c3aed}@media(max-width:768px){:root{--space-4: 16px;--space-5: 24px;--space-6: 32px}}.spin{animation:spin 1s linear infinite;display:inline-block}*{box-sizing:border-box;margin:0;padding:0}body{background-color:var(--color-bg);color:var(--color-text);font-family:var(--font-body);line-height:1.6;-webkit-font-smoothing:antialiased;overflow-x:hidden;width:100%}html{width:100%}h1,h2,h3,h4,h5,h6{font-family:var(--font-heading);font-weight:700;line-height:1.2;margin-bottom:var(--space-4)}.hero-title{font-size:3.5rem;font-weight:800;line-height:1.2;margin-bottom:var(--space-4)}.hero-subtitle{font-size:1.2rem;color:var(--color-muted);margin-bottom:var(--space-6);line-height:1.6}@media(max-width:768px){.hero-title{font-size:2.2rem}.hero-subtitle{font-size:1rem}}a{color:var(--color-accent);text-decoration:none;transition:var(--transition-fast)}a:hover{color:var(--color-primary);filter:drop-shadow(0 0 8px var(--color-accent-glow))}button{cursor:pointer;font-family:var(--font-body);border:none;outline:none}.container{max-width:1200px;margin:0 auto;padding:0 var(--space-4)}.glass{background:var(--glass-bg);backdrop-filter:var(--glass-blur);-webkit-backdrop-filter:var(--glass-blur);border:1px solid var(--glass-border);border-radius:var(--border-radius);box-shadow:var(--glass-shadow)}.card{background:var(--color-card);border:1px solid var(--color-border);border-radius:var(--border-radius);padding:var(--space-4);transition:var(--transition-normal)}.card:hover{transform:translateY(-4px);border-color:var(--color-accent);box-shadow:0 10px 30px -10px #7dd3fc33}.aspect-video{aspect-ratio:16 / 9;width:100%;overflow:hidden;position:relative;background-color:#000}.aspect-video iframe,.aspect-video video{position:absolute;top:0;left:0;width:100%;height:100%;border:0}.w-full{width:100%}.h-full{height:100%}.rounded-lg{border-radius:var(--border-radius)}.shadow-lg{box-shadow:0 10px 15px -3px #0000001a,0 4px 6px -2px #0000000d}.btn{display:inline-flex;align-items:center;justify-content:center;padding:var(--space-2) var(--space-4);border-radius:4px;font-weight:600;font-size:.95rem;transition:var(--transition-normal);gap:var(--space-2)}.btn-primary{background:linear-gradient(135deg,var(--color-accent),var(--color-primary));color:var(--color-bg)}.btn-primary:hover{transform:scale(1.05);box-shadow:0 0 20px var(--color-accent-glow)}.btn-success{background:var(--color-brand-secondary);color:#fff;border:none}.btn-success:hover{background:var(--color-brand-accent);transform:translateY(-2px);box-shadow:0 4px 12px #06b6d44d}.btn-outline{background:transparent;border:1px solid var(--color-accent);color:var(--color-accent)}.btn-outline:hover{background:var(--color-accent-glow);color:var(--color-text)}.btn-ghost{background:transparent;color:var(--color-muted);transition:var(--transition-fast)}.btn-ghost:hover{color:var(--color-accent);background:#ffffff08}.switch{position:relative;display:inline-block;width:44px;height:24px;flex-shrink:0}.switch input{opacity:0;width:0;height:0}.slider{position:absolute;cursor:pointer;inset:0;background-color:var(--bg-tertiary);transition:.4s cubic-bezier(.4,0,.2,1);border-radius:24px;border:1px solid var(--border-color)}.slider:before{position:absolute;content:"";height:18px;width:18px;left:2px;bottom:2px;background-color:#fff;transition:.4s cubic-bezier(.4,0,.2,1);border-radius:50%;box-shadow:0 2px 4px #0003}input:checked+.slider{background-color:var(--color-accent);border-color:var(--color-accent)}input:checked+.slider:before{transform:translate(20px)}.segmented-control{display:flex;background:var(--bg-tertiary);padding:4px;border-radius:12px;border:1px solid var(--border-color);width:fit-content;gap:2px}.segmented-item{padding:10px 18px;border-radius:9px;cursor:pointer;font-size:.9rem;font-weight:600;transition:all .2s cubic-bezier(.4,0,.2,1);border:none;background:transparent;color:var(--color-muted);white-space:nowrap;display:flex;flex-direction:column;align-items:center;gap:2px}.segmented-item.active{background:var(--color-card);color:var(--color-accent);box-shadow:0 4px 12px #00000026}.segmented-item:hover:not(.active){color:var(--color-text);background:#ffffff0d}@media(max-width:500px){.segmented-control{width:100%;display:grid;grid-template-columns:1fr 1fr}.segmented-item{padding:12px 8px;font-size:.8rem}}.list-none{list-style:none;padding:0;margin:0}.quiz-question-card{background:var(--bg-secondary);border-radius:16px;padding:1.5rem;border:1px solid var(--border-color);margin-bottom:2rem;box-shadow:var(--glass-shadow);transition:all .3s cubic-bezier(.4,0,.2,1)}.quiz-question-card:hover{border-color:var(--color-accent)}.quiz-badge{padding:4px 12px;background:var(--color-accent);color:#fff;border-radius:20px;font-size:.75rem;font-weight:700;text-transform:uppercase}.tier-badge{padding:2px 6px;border-radius:4px;font-size:.7rem;font-weight:400;background:var(--bg-secondary);border:1px solid var(--border-color);color:var(--color-muted)}.answer-grid{display:grid;grid-template-columns:1fr 1fr;gap:1rem;margin-top:1rem}.answer-card{display:flex;align-items:center;gap:1rem;padding:12px 16px;background:var(--bg-tertiary);border-radius:10px;border:1px solid var(--border-color);transition:all .2s ease;cursor:pointer}.answer-card:hover{background:#ffffff0d}.answer-card.correct{border-color:#10b981;background:#10b9810d}.answer-card.correct input[type=radio]{accent-color:#10b981}.answer-card input[type=text]{background:transparent!important;border:none!important;padding:0!important;margin:0!important;font-size:.9rem!important}.answer-card input[type=text]:focus{outline:none!important}@media(max-width:600px){.answer-grid{grid-template-columns:1fr}}input,textarea,select{width:100%;padding:12px;background:var(--bg-tertiary);border:1px solid var(--border-color);border-radius:var(--border-radius);color:var(--text-main);font-family:var(--font-body);transition:var(--transition-fast)}select option{background-color:var(--bg-tertiary);color:var(--text-main)}input:focus,textarea:focus,select:focus{outline:none;border-color:var(--color-accent);background:#ffffff14;box-shadow:0 0 0 4px var(--color-accent-glow)}@media(prefers-reduced-motion:reduce){*,:before,:after{animation-delay:-1ms!important;animation-duration:1ms!important;animation-iteration-count:1!important;background-attachment:initial!important;scroll-behavior:auto!important;transition-duration:0s!important;transition-delay:0s!important}}.hero-section{margin:0;padding:var(--space-6) 0 60px;text-align:center;position:relative;overflow:hidden;width:100%}@media(max-width:640px){.footer-main-row{flex-direction:column!important;align-items:flex-start!important;text-align:left}.footer-brand-section{width:100%}.footer-copyright{text-align:center;width:100%;margin-top:var(--space-3)!important}.footer-links-section{width:100%;display:flex;justify-content:center}.footer-links-list{justify-content:center;width:100%}}.mobile-only{display:none}@media(max-width:768px){.mobile-only{display:block}.desktop-only{display:none!important}.profile-main{padding:var(--space-4)!important}.profile-main h1{font-size:1.5rem!important}}.course-player-layout{display:grid;grid-template-columns:1fr 380px;gap:var(--space-8);max-width:1500px;margin:0 auto;padding:var(--space-6);min-height:calc(100vh - 80px);background:var(--bg-primary)}@media(max-width:1200px){.course-player-layout{grid-template-columns:1fr 320px;gap:var(--space-5)}}.course-player-main{flex:1;display:flex;flex-direction:column;gap:var(--space-5)}.course-player-sidebar{background:var(--glass-bg);-webkit-backdrop-filter:blur(12px);backdrop-filter:blur(12px);border:1px solid var(--glass-border);border-radius:20px;height:fit-content;position:sticky;top:20px;display:flex;flex-direction:column;overflow:hidden;box-shadow:var(--glass-shadow)}@media(max-width:768px){.course-player-layout{display:flex;flex-direction:column;height:auto;padding:var(--space-4);gap:var(--space-6)}.course-player-sidebar{width:100%;position:relative;top:0;order:2}.course-player-main{order:1;width:100%}}.course-detail-layout{display:grid;grid-template-columns:2fr 1fr;gap:var(--space-6)}@media(max-width:992px){.course-detail-layout{grid-template-columns:1fr;display:flex;flex-direction:column}.course-detail-sidebar-container{order:-1;margin-bottom:var(--space-6)}}.course-detail-sidebar-container{position:relative}.course-detail-sidebar-card{position:sticky;top:100px;background:var(--bg-secondary);border:1px solid var(--border-color);border-radius:var(--border-radius-lg);padding:var(--space-5) var(--space-4);box-shadow:var(--glass-shadow);overflow:hidden}@media(max-width:992px){.course-detail-sidebar-card{position:static;margin-bottom:var(--space-4)}}.lesson-top-bar{margin-bottom:var(--space-4)}.course-breadcrumb{color:var(--color-accent);font-size:.75rem;font-weight:700;letter-spacing:.1em;display:block;margin-bottom:var(--space-1)}.lesson-top-bar h1{font-size:2rem;margin:0}.video-section{display:flex;flex-direction:column;gap:var(--space-4)}.video-container{width:100%;max-width:1000px;background:#000;border-radius:var(--border-radius-lg);overflow:hidden;box-shadow:0 20px 50px -10px #00000080;border:1px solid var(--glass-border)}@media(max-width:768px){.video-container{max-width:100%}}.lesson-nav-controls{display:flex;justify-content:space-between;align-items:center;border-bottom:1px solid var(--glass-border);padding-bottom:var(--space-4)}.nav-btn{display:flex;align-items:center;gap:var(--space-2);font-weight:600}.next-btn{background:linear-gradient(135deg,var(--color-brand-secondary),var(--color-brand-accent));color:#fff;border-radius:var(--border-radius);padding:var(--space-3) var(--space-5);box-shadow:0 4px 15px #38bdf84d}.lesson-info-section{margin-top:var(--space-4)}.tab-nav{display:flex;gap:var(--space-6);border-bottom:1px solid var(--glass-border);margin-bottom:var(--space-6)}.tab-item{background:transparent;border:none;padding:var(--space-3) 0;color:var(--color-muted);font-weight:600;display:flex;align-items:center;gap:var(--space-2);cursor:pointer;position:relative;transition:var(--transition-fast)}.tab-item:hover{color:var(--color-text)}.tab-item.active{color:var(--color-accent)}.tab-item.active:after{content:"";position:absolute;bottom:-1px;left:0;width:100%;height:3px;background:var(--color-accent);border-radius:3px 3px 0 0}.tab-content{min-height:200px}.overview-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-4)}.takeaways-section h4{margin:var(--space-6) 0 var(--space-3)}.takeaways-section ul{list-style:disc;padding-left:var(--space-5);color:var(--color-muted)}.takeaways-section li{margin-bottom:var(--space-2)}.instructor-card{margin-top:var(--space-8);padding:var(--space-4);display:flex;align-items:center;gap:var(--space-4);max-width:400px}.instructor-avatar{width:50px;height:50px;border-radius:50%;background:var(--color-card);display:flex;align-items:center;justify-content:center;border:1px solid var(--glass-border)}.instructor-info h5{margin:0;font-size:1rem}.instructor-info p{margin:0;font-size:.85rem;color:var(--color-muted)}.sidebar-header{padding:var(--space-6) var(--space-4);border-bottom:1px solid var(--glass-border)}.sidebar-header h3{margin-bottom:var(--space-4);font-size:1.25rem}.progress-container{display:flex;flex-direction:column;gap:var(--space-2)}.progress-stats{display:flex;justify-content:space-between;font-size:.75rem;color:var(--color-muted);font-weight:600}.progress-bar-bg{width:100%;height:6px;background:var(--bg-tertiary);border-radius:3px;overflow:hidden}.progress-bar-fill{height:100%;background:var(--color-brand-secondary);transition:width .5s ease}.sidebar-modules{flex:1;overflow-y:auto}.module-item{border-bottom:1px solid var(--glass-border)}.module-header{padding:var(--space-4);display:flex;justify-content:space-between;align-items:center;cursor:pointer;background:#ffffff05;transition:var(--transition-fast)}.module-header:hover{background:#ffffff0d}.module-title-group{display:flex;flex-direction:column}.module-title{font-weight:700;font-size:.95rem}.module-meta{font-size:.75rem;color:var(--color-muted)}.module-lessons{background:#0000001a}.lesson-item{padding:var(--space-3) var(--space-4);display:flex;gap:var(--space-3);align-items:center;cursor:pointer;transition:var(--transition-fast);border-left:3px solid transparent}.lesson-item:hover{background:#ffffff08}.lesson-item.active{background:#38bdf81a;border-left-color:var(--color-accent)}.lesson-item.active .lesson-title{color:var(--color-brand-accent);font-weight:600}.lesson-status{display:flex;align-items:center;justify-content:center;width:20px}.icon-success{color:var(--color-success)}.icon-active{color:var(--color-accent)}.icon-idle{color:var(--color-muted);opacity:.5}.lesson-info{display:flex;flex-direction:column;flex:1}.lesson-title{font-size:.85rem}.lesson-duration{font-size:.7rem;color:var(--color-muted)}.sidebar-footer{padding:var(--space-4);border-top:1px solid var(--glass-border)}.back-btn{width:100%;justify-content:flex-start}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100%;text-align:center;color:var(--color-muted)}.empty-tab{padding:var(--space-6);color:var(--color-muted);text-align:center;background:#0000001a;border-radius:var(--border-radius)}.spinner{width:40px;height:40px;border:3px solid var(--glass-border);border-top:3px solid var(--color-accent);border-radius:50%;animation:spin 1s linear infinite}@keyframes spin{0%{transform:rotate(0)}to{transform:rotate(360deg)}}.burger-btn{background:transparent;border:none;color:var(--color-text);font-size:1.8rem;cursor:pointer;padding:12px;min-width:48px;min-height:48px;display:none;z-index:1001}.mobile-menu-overlay{position:fixed;top:0;left:0;width:100%;height:100vh;background:var(--color-bg);background:#010816f2;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);z-index:2000;display:flex;flex-direction:column;align-items:center;justify-content:center;gap:var(--space-5);transition:opacity .3s ease}.mobile-menu-close{position:absolute;top:20px;right:20px;background:transparent;border:none;color:var(--color-text);font-size:1.5rem;cursor:pointer}.mobile-menu-link{font-size:1.5rem;font-weight:700;color:var(--color-text)}@media(max-width:768px){.burger-btn{display:block}.logo-text{font-size:1.2rem!important}}.responsive-form-grid{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-3)}.responsive-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-4)}.responsive-scroll-header,.explore-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:var(--space-5);flex-wrap:wrap;gap:var(--space-4)}.responsive-scroll-tabs,.explore-tabs{display:flex;gap:var(--space-2)}.responsive-scroll-tabs button,.explore-tabs button{white-space:nowrap;flex-shrink:0}@media(max-width:768px){.responsive-form-grid{grid-template-columns:1fr}.responsive-header{flex-direction:column;align-items:stretch;gap:var(--space-3)}.hero-section{padding-bottom:60px!important}.responsive-header button{width:100%}.responsive-scroll-header,.explore-header{flex-direction:column;align-items:center;text-align:center;gap:var(--space-3)}.responsive-scroll-tabs,.explore-tabs{width:100%;overflow-x:auto;padding-bottom:8px;-webkit-overflow-scrolling:touch;scrollbar-width:none;justify-content:center}.responsive-scroll-tabs::-webkit-scrollbar,.explore-tabs::-webkit-scrollbar{display:none}.admin-mobile-card{background-color:var(--color-card);border-radius:var(--border-radius);padding:16px;margin-bottom:var(--space-4);border:1px solid var(--border-color);box-shadow:0 4px 6px -1px #0000001a,0 2px 4px -1px #0000000f}.mobile-actions-grid{display:grid;grid-template-columns:1fr 1fr;gap:var(--space-2);margin-top:var(--space-3)}.mobile-actions-grid button{width:100%;justify-content:center;padding:10px}.text-gradient{background:linear-gradient(135deg,var(--color-accent) 0%,var(--color-primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.btn-gradient{background:linear-gradient(135deg,var(--color-accent) 0%,var(--color-primary) 100%);color:#fff;border:none;font-weight:700;transition:filter .3s ease}.btn-gradient:hover{filter:brightness(1.1);box-shadow:0 0 20px #7dd3fc66}.input-group input{background-color:#ffffff08;border:1px solid var(--glass-border);color:var(--color-text);padding:12px 16px;border-radius:var(--border-radius);outline:none;transition:all .3s ease}.input-group input:focus{border-color:var(--color-accent);box-shadow:0 0 0 2px var(--color-accent-glow);background-color:#ffffff0d}}.footer-bottom{margin-top:var(--space-6);padding-top:var(--space-4);border-top:1px solid var(--border-color);display:flex;justify-content:space-between;align-items:center;flex-wrap:wrap;gap:var(--space-3)}@media(max-width:768px){.footer-bottom{flex-direction:column;justify-content:center;text-align:center;gap:var(--space-4)}}