.navbar{background:#fff;border-bottom:1px solid #e5e5e5;position:sticky;top:0;z-index:100}.navbar-content{display:flex;align-items:center;justify-content:space-between;height:64px}.navbar-brand{display:flex;align-items:center;gap:8px;font-family:Outfit,sans-serif;font-size:1.25rem;font-weight:600;color:#1a1a1a}.navbar-brand svg{color:#1a1a1a}.navbar-links{display:flex;gap:32px}.nav-link{color:#666;font-weight:500;font-size:.95rem;transition:color .2s;position:relative}.nav-link:hover{color:#1a1a1a}.nav-link:after{content:"";position:absolute;bottom:-4px;left:0;width:0;height:2px;background:#1a1a1a;transition:width .2s}.nav-link:hover:after{width:100%}.navbar-auth{display:flex;align-items:center;gap:12px}.navbar-user{display:flex;align-items:center;gap:16px}.nav-link-user{display:flex;align-items:center;gap:6px;color:var(--primary);font-weight:500}.nav-link-user:hover{color:var(--primary-light)}.user-info{display:flex;align-items:center;gap:6px;color:var(--text-secondary);font-size:.9rem}.course-card{display:flex;flex-direction:column;background:var(--dark-surface);border-radius:16px;border:1px solid var(--border);overflow:hidden;transition:all .3s ease}.course-card:hover{transform:translateY(-6px);box-shadow:0 20px 50px #0006;border-color:var(--primary)}.course-card-image{position:relative;aspect-ratio:16/9;overflow:hidden}.course-card-image img{width:100%;height:100%;object-fit:cover;transition:transform .3s ease}.course-card:hover .course-card-image img{transform:scale(1.05)}.course-card-badge{position:absolute;top:12px;left:12px}.course-card-price{position:absolute;bottom:12px;right:12px;background:#000c;padding:6px 12px;border-radius:8px;font-weight:700;font-size:.9rem}.course-card-content{padding:20px;display:flex;flex-direction:column;flex:1}.course-card-category{font-size:.75rem;color:var(--primary);font-weight:600;text-transform:uppercase;letter-spacing:.5px;margin-bottom:8px}.course-card-title{font-size:1.1rem;font-weight:600;margin-bottom:8px;display:-webkit-box;-webkit-line-clamp:2;-webkit-box-orient:vertical;overflow:hidden}.course-card-instructor{display:flex;align-items:center;gap:8px;margin-bottom:12px;color:var(--text-secondary);font-size:.9rem}.course-card-instructor img{width:24px;height:24px;border-radius:50%;object-fit:cover}.course-card-meta{display:flex;gap:16px;margin-top:auto;padding-top:12px;border-top:1px solid var(--border);color:var(--text-muted);font-size:.85rem}.course-card-meta span{display:flex;align-items:center;gap:4px}.hero{padding:80px 0;text-align:center;background:radial-gradient(ellipse at top,rgba(99,102,241,.15) 0%,transparent 50%)}.hero h1{font-size:3.5rem;margin-bottom:20px;line-height:1.1}.hero h1 span{color:var(--primary)}.hero p{font-size:1.25rem;color:var(--text-secondary);max-width:600px;margin:0 auto 32px}.hero-buttons{display:flex;gap:16px;justify-content:center}.features{padding:60px 0;background:var(--dark-surface)}.features-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:24px}.feature-card{text-align:center;padding:32px 24px;background:var(--dark-surface-2);border-radius:16px;border:1px solid var(--border);transition:all .3s ease}.feature-card:hover{transform:translateY(-4px);border-color:var(--primary)}.feature-icon{width:60px;height:60px;display:flex;align-items:center;justify-content:center;background:var(--primary);border-radius:16px;margin:0 auto 16px}.feature-icon svg{color:#fff}.feature-card h3{font-size:1.1rem;margin-bottom:8px}.feature-card p{color:var(--text-secondary);font-size:.9rem}.courses-section{padding:60px 0}.courses-header{display:flex;justify-content:space-between;align-items:center;margin-bottom:40px;flex-wrap:wrap;gap:20px}.courses-filters{display:flex;gap:12px;flex-wrap:wrap}.filter-btn{padding:8px 20px;background:var(--dark-surface);border:1px solid var(--border);border-radius:25px;color:var(--text-secondary);font-weight:500;transition:all .2s}.filter-btn:hover,.filter-btn.active{background:var(--primary);border-color:var(--primary);color:#fff}.search-box{position:relative;width:300px}.search-box input{width:100%;padding:10px 16px 10px 44px;background:var(--dark-surface);border:1px solid var(--border);border-radius:25px;color:var(--text-primary)}.search-box svg{position:absolute;left:16px;top:50%;transform:translateY(-50%);color:var(--text-muted)}.footer{background:var(--dark-surface);border-top:1px solid var(--border);padding:40px 0;margin-top:60px}.footer-content{display:flex;justify-content:space-between;align-items:center}.footer-brand{display:flex;align-items:center;gap:10px;font-family:Outfit,sans-serif;font-size:1.25rem;font-weight:700}.footer-brand svg{color:var(--primary)}.footer-text{color:var(--text-muted);font-size:.9rem}.footer-links{display:flex;gap:24px}.footer-links a{color:var(--text-secondary);font-size:.9rem}.footer-links a:hover{color:var(--primary)}.auth-page{min-height:calc(100vh - 70px);display:flex;align-items:center;justify-content:center;padding:40px 20px}.auth-card{background:var(--dark-surface);border-radius:20px;padding:40px;width:100%;max-width:440px;border:1px solid var(--border)}.auth-header{text-align:center;margin-bottom:32px}.auth-header h1{font-size:1.75rem;margin-bottom:8px}.auth-header p{color:var(--text-secondary)}.auth-form{display:flex;flex-direction:column;gap:20px}.form-group{display:flex;flex-direction:column;gap:8px}.form-group label{font-weight:500;font-size:.9rem}.form-footer{text-align:center;margin-top:24px;color:var(--text-secondary)}.form-footer a{color:var(--primary);font-weight:600}.role-select{display:flex;gap:12px}.role-btn{flex:1;padding:12px;background:var(--dark-surface-2);border:2px solid var(--border);border-radius:10px;color:var(--text-secondary);font-weight:500;transition:all .2s}.role-btn:hover{border-color:var(--primary)}.role-btn.active{background:#6366f11a;border-color:var(--primary);color:var(--primary)}.dashboard{padding:40px 0}.dashboard-header{margin-bottom:40px}.dashboard-header h1{font-size:2rem;margin-bottom:8px}.dashboard-header p{color:var(--text-secondary)}.dashboard-stats{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:40px}.stat-card{background:var(--dark-surface);border-radius:16px;padding:24px;border:1px solid var(--border)}.stat-card h3{color:var(--text-secondary);font-size:.9rem;font-weight:500;margin-bottom:8px}.stat-card .value{font-size:2rem;font-weight:700;font-family:Outfit,sans-serif}.enrolled-course-card{display:flex;gap:20px;background:var(--dark-surface);border-radius:16px;padding:20px;border:1px solid var(--border);margin-bottom:16px;transition:all .2s}.enrolled-course-card:hover{border-color:var(--primary)}.enrolled-course-card img{width:200px;height:120px;object-fit:cover;border-radius:12px}.enrolled-course-info{flex:1}.enrolled-course-info h3{font-size:1.1rem;margin-bottom:8px}.enrolled-course-info .instructor{color:var(--text-secondary);font-size:.9rem;margin-bottom:12px}.enrolled-course-progress{margin-top:12px}.progress-info{display:flex;justify-content:space-between;margin-bottom:8px;font-size:.85rem}.analytics-header{margin-bottom:24px}.analytics-header h2{display:flex;align-items:center;gap:10px;font-size:1.5rem}.analytics-grid{display:grid;grid-template-columns:repeat(4,1fr);gap:20px;margin-bottom:32px}.stat-card-analytics{display:flex;align-items:center;gap:16px;background:var(--dark-surface);border:1px solid var(--border);border-radius:12px;padding:20px}.stat-icon{width:48px;height:48px;border-radius:12px;display:flex;align-items:center;justify-content:center}.stat-info{display:flex;flex-direction:column}.stat-label{font-size:.875rem;color:var(--text-muted)}.stat-value{font-size:1.5rem;font-weight:700;color:var(--text-primary)}.stat-sub{font-size:.75rem;color:var(--text-muted)}.circular-progress-wrapper{position:relative;display:flex;align-items:center;justify-content:center}.circular-progress-label{position:absolute;display:flex;flex-direction:column;align-items:center;justify-content:center}.circular-progress-label .progress-value{font-size:1.5rem;font-weight:700;color:var(--text-primary)}.circular-progress-label .progress-label{font-size:.75rem;color:var(--text-muted)}.progress-overview-card{display:flex;align-items:center;gap:32px;background:var(--dark-surface);border:1px solid var(--border);border-radius:16px;padding:32px;margin-bottom:32px}.progress-overview-left{display:flex;align-items:center;justify-content:center}.progress-overview-right h3{display:flex;align-items:center;gap:8px;font-size:1.25rem;margin-bottom:8px}.progress-overview-right p{color:var(--text-secondary);margin-bottom:16px}.progress-stats-mini{display:flex;gap:24px;margin-bottom:16px}.progress-stat-mini{display:flex;align-items:center;gap:6px;color:var(--text-secondary);font-size:.875rem}.course-detail{padding:40px 0}.course-detail-header{display:grid;grid-template-columns:1fr 380px;gap:40px;margin-bottom:40px}.course-detail-main h1{font-size:2.25rem;margin-bottom:16px}.course-detail-main .description{color:var(--text-secondary);font-size:1.1rem;margin-bottom:24px;line-height:1.7}.course-detail-main .meta{display:flex;gap:24px;flex-wrap:wrap}.course-meta-item{display:flex;align-items:center;gap:8px;color:var(--text-secondary)}.course-detail-sidebar{background:var(--dark-surface);border-radius:20px;padding:28px;border:1px solid var(--border);position:sticky;top:100px;height:fit-content}.course-detail-sidebar img{width:100%;aspect-ratio:16/9;object-fit:cover;border-radius:12px;margin-bottom:20px}.course-detail-sidebar .price{font-size:2rem;font-weight:700;margin-bottom:20px;font-family:Outfit,sans-serif}.course-detail-sidebar .enroll-btn{width:100%;margin-bottom:12px}.course-detail-sidebar .preview-btn{width:100%}.course-detail-content{margin-top:60px}.content-section{margin-bottom:40px}.content-section h2{font-size:1.5rem;margin-bottom:20px}.learn-list{list-style:none;display:grid;grid-template-columns:repeat(2,1fr);gap:16px}.learn-list li{display:flex;align-items:center;gap:12px;color:var(--text-secondary)}.learn-list li svg{color:var(--secondary);flex-shrink:0}.curriculum{display:flex;flex-direction:column;gap:16px}.curriculum-section{background:var(--dark-surface);border-radius:12px;border:1px solid var(--border);overflow:hidden}.curriculum-section-header{display:flex;justify-content:space-between;align-items:center;padding:16px 20px;background:var(--dark-surface-2);cursor:pointer}.curriculum-section-header h3{font-size:1rem}.curriculum-section-header span{color:var(--text-muted);font-size:.85rem}.curriculum-lessons{padding:0}.curriculum-lesson{display:flex;align-items:center;gap:12px;padding:14px 20px;border-top:1px solid var(--border);color:var(--text-secondary);transition:all .2s}.curriculum-lesson:hover{background:var(--dark-surface-2);color:var(--text-primary)}.curriculum-lesson svg{color:var(--text-muted)}.curriculum-lesson .duration{margin-left:auto;font-size:.85rem;color:var(--text-muted)}.learning-page{min-height:calc(100vh - 70px)}.learning-container{display:grid;grid-template-columns:1fr 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h2{font-size:1.1rem;margin-bottom:8px}.learning-progress{margin-top:12px}.learning-progress-text{display:flex;justify-content:space-between;font-size:.85rem;margin-bottom:8px}.lesson-list{flex:1;overflow-y:auto}.lesson-section{border-bottom:1px solid var(--border)}.lesson-section-title{padding:14px 20px;background:var(--dark-surface-2);font-weight:600;font-size:.9rem;color:var(--text-secondary)}.lesson-item{display:flex;align-items:center;gap:12px;padding:14px 20px;cursor:pointer;transition:all .2s;border-left:3px solid transparent}.lesson-item:hover{background:var(--dark-surface-2)}.lesson-item.active{background:#6366f11a;border-left-color:var(--primary)}.lesson-item.completed .lesson-check{color:var(--secondary)}.lesson-item-title{flex:1;font-size:.9rem}.lesson-item-duration{font-size:.8rem;color:var(--text-muted)}.lesson-item-status{width:20px;height:20px;border-radius:50%;border:2px solid var(--border);display:flex;align-items:center;justify-content:center}.lesson-item.completed .lesson-item-status{background:var(--secondary);border-color:var(--secondary)}.lesson-item.active .lesson-item-status{background:var(--primary);border-color:var(--primary)}@media (max-width: 1024px){.learning-container{grid-template-columns:1fr;height:auto}.learning-sidebar{border-left:none;border-top:1px solid var(--border);max-height:400px}.course-detail-header{grid-template-columns:1fr}.course-detail-sidebar{position:static}.learn-list{grid-template-columns:1fr}.dashboard-stats,.features-grid{grid-template-columns:repeat(2,1fr)}}@media (max-width: 768px){.hero h1{font-size:2.5rem}.hero-buttons{flex-direction:column}.navbar-links{display:none}.enrolled-course-card{flex-direction:column}.enrolled-course-card img{width:100%;height:160px}.dashboard-stats{grid-template-columns:1fr}}.create-course{padding:40px 0;max-width:800px;margin:0 auto}.create-course h1{font-size:2rem;margin-bottom:32px}.create-course-form{display:flex;flex-direction:column;gap:24px}.form-row{display:grid;grid-template-columns:repeat(2,1fr);gap:20px}@media (max-width: 640px){.form-row{grid-template-columns:1fr}}.empty-state{text-align:center;padding:60px 20px}.empty-state svg{color:var(--text-muted);margin-bottom:16px}.empty-state h3{margin-bottom:8px}.empty-state p{color:var(--text-secondary);margin-bottom:24px}.practice{padding:40px 0;min-height:calc(100vh - 70px)}.practice-header{text-align:center;margin-bottom:32px}.practice-header h1{font-size:2rem;margin-bottom:8px;display:flex;align-items:center;justify-content:center;gap:12px}.practice-header p{color:var(--text-secondary);font-size:1.1rem}.practice-toolbar{display:flex;justify-content:space-between;align-items:center;margin-bottom:24px;padding:16px 20px;background:var(--dark-surface);border-radius:12px;border:1px solid var(--border)}.language-select{padding:10px 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768px){.practice-content,.notes-grid{grid-template-columns:1fr}.practice-toolbar{flex-direction:column;gap:16px}.toolbar-actions{width:100%;justify-content:center}}.chat-toggle{position:fixed;bottom:24px;right:24px;width:60px;height:60px;border-radius:50%;background:var(--primary);border:none;color:#fff;cursor:pointer;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 24px #6366f166;transition:all .3s ease;z-index:999}.chat-toggle:hover{transform:scale(1.1);box-shadow:0 12px 32px #6366f180}.chat-toggle.open{background:var(--dark-surface);border:2px solid var(--border);color:var(--text-primary)}.chat-container{position:fixed;bottom:100px;right:24px;width:380px;max-width:calc(100vw - 48px);height:550px;background:var(--dark-surface);border-radius:16px;border:1px solid var(--border);box-shadow:0 12px 48px #00000080;display:flex;flex-direction:column;overflow:hidden;z-index:998;animation:slideIn .3s ease}@keyframes 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.2s}.chat-btn-icon:hover{background:#ffffff1a}.chat-messages{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:16px;background:var(--dark)}.chat-messages::-webkit-scrollbar{width:6px}.chat-messages::-webkit-scrollbar-track{background:var(--dark-surface)}.chat-messages::-webkit-scrollbar-thumb{background:var(--border);border-radius:3px}.chat-messages::-webkit-scrollbar-thumb:hover{background:var(--primary)}.chat-message{display:flex;gap:12px;align-items:flex-start;animation:messageSlide .3s ease}@keyframes messageSlide{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.chat-message.user{flex-direction:row-reverse}.message-avatar{font-size:24px;flex-shrink:0}.message-content{max-width:75%;display:flex;flex-direction:column;gap:4px}.chat-message.bot .message-content{align-items:flex-start}.chat-message.user .message-content{align-items:flex-end}.message-content p{margin:0;padding:12px 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