.btn-admin:hover{background-color:var(--primary-color);opacity:1}.lesson-back{max-width:1100px;margin:1.5rem auto 0;padding:0 1rem}.lesson-back .btn{display:inline-block}.btn-admin.active{background-color:var(--primary-dark)}.hamburger{display:none;flex-direction:column;gap:.5rem;background:none;border:none;cursor:pointer;padding:.75rem;z-index:101}.hamburger span{width:30px;height:4px;background-color:var(--primary-color);transition:all .3s ease;border-radius:3px;display:block}.hamburger.active span:nth-child(1){transform:rotate(45deg) translate(9px,9px)}.hamburger.active span:nth-child(2){opacity:0}.hamburger.active span:nth-child(3){transform:rotate(-45deg) translate(8px,-8px)}:root{--primary-color: #6366f1;--secondary-color: #ffffff;--text-color: #1f2937;--text-light: #6b7280;--bg-color: #f3f4f6;--card-bg: #ffffff;--border-color: #e5e7eb;--success-color: #10b981;--warning-color: #f59e0b;--danger-color: #ef4444;--shadow: 0 1px 3px rgba(0, 0, 0, .1);--shadow-lg: 0 10px 25px rgba(0, 0, 0, .1);--radius: .5rem}*{margin:0;padding:0;box-sizing:border-box}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,sans-serif;line-height:1.6;color:var(--text-color);background-color:var(--bg-color)}.container{max-width:1200px;margin:0 auto;padding:0 2rem}.navbar{background:var(--card-bg);box-shadow:var(--shadow);padding:1rem 0;position:sticky;top:0;z-index:100}.navbar .container{display:flex;justify-content:space-between;flex-wrap:wrap;align-items:center}.logo{font-size:1.5rem;font-weight:700;color:var(--primary-color);text-decoration:none}.logo span{color:var(--warning-color)}.nav-menu{display:flex;gap:2rem;list-style:none;align-items:center}.nav-menu a{color:var(--text-color);text-decoration:none;transition:color .3s}.nav-menu a:hover,.nav-menu a.active{color:var(--primary-color)}.btn-admin{background:var(--primary-color);color:#fff!important;padding:.5rem 1.5rem;border-radius:var(--radius);transition:opacity .3s}.btn-admin.active{opacity:.85}.hero{position:relative;min-height:85vh;display:flex;align-items:center;justify-content:center;text-align:center;overflow:hidden;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff}.grid-background{position:absolute;top:0;right:0;bottom:0;left:0;background-image:linear-gradient(rgba(255,255,255,.05) 1px,transparent 1px),linear-gradient(90deg,rgba(255,255,255,.05) 1px,transparent 1px);background-size:50px 50px;animation:gridMove 20s linear infinite}@keyframes gridMove{0%{transform:translate(0)}to{transform:translate(50px,50px)}}.hero .container{position:relative;z-index:1}.hero-title{font-size:4rem;font-weight:800;margin-bottom:1rem;line-height:1.2}.hero-subtitle{font-size:1.5rem;margin-bottom:2rem;opacity:.95}.hero-actions{display:flex;gap:1rem;justify-content:center;margin-bottom:3rem}.scroll-indicator{animation:bounce 2s infinite;opacity:.8}@keyframes bounce{0%,to{transform:translateY(0)}50%{transform:translateY(10px)}}.btn{display:inline-block;padding:.75rem 2rem;border-radius:var(--radius);text-decoration:none;font-weight:600;transition:all .3s;cursor:pointer;border:none;font-size:1rem}.btn-primary{background:var(--primary-color);color:#fff}.btn-primary:hover{transform:translateY(-2px);box-shadow:var(--shadow-lg)}.btn-secondary{background:transparent;color:#fff;border:2px solid white}.btn-secondary:hover{background:#fff;color:var(--primary-color)}.btn-success{background:var(--success-color);color:#fff}.btn-danger{background:var(--danger-color);color:#fff}.btn-block{display:block;width:100%}.section-info,.section-themes,.section-content{padding:4rem 0}.section-info{background:var(--card-bg);text-align:center}.section-info h2{font-size:2.5rem;margin-bottom:1rem}.section-info p{font-size:1.1rem;color:var(--text-light);max-width:800px;margin:0 auto 2rem}.section-themes h2{font-size:2rem;margin-bottom:2rem;text-align:center}.themes-grid{display:grid;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));gap:2rem}.theme-card{background:var(--card-bg);padding:2rem;border-radius:var(--radius);box-shadow:var(--shadow);transition:transform .3s,box-shadow .3s}.theme-card:hover{transform:translateY(-5px);box-shadow:var(--shadow-lg)}.theme-card h3{font-size:1.5rem;margin-bottom:.5rem;color:var(--primary-color)}.theme-card p{color:var(--text-light)}.module-card{background:var(--card-bg);padding:1.5rem;border-radius:var(--radius);box-shadow:var(--shadow);margin-bottom:2rem}.module-card h3{font-size:1.8rem;margin-bottom:.5rem}.module-card p{color:var(--text-light);margin-bottom:1rem}.module-card .lessons-label{font-size:.9rem;font-weight:600;color:var(--text-color);margin-bottom:.5rem;text-transform:uppercase}.lesson-list{list-style:none}.lesson-item{background:var(--bg-color);padding:1rem;border-radius:var(--radius);margin-bottom:.5rem;display:flex;align-items:center;gap:1rem}.lesson-number{width:40px;height:40px;background:var(--primary-color);color:#fff;border-radius:50%;display:flex;align-items:center;justify-content:center;font-weight:700;flex-shrink:0}.lesson-info h4{font-size:1rem;margin-bottom:.25rem}.lesson-info p{font-size:.9rem;color:var(--text-light);margin:0}.contact-card{background:var(--card-bg);padding:3rem;border-radius:var(--radius);box-shadow:var(--shadow);max-width:600px;margin:0 auto}.contact-card h2{font-size:1.5rem;margin-bottom:.5rem}.contact-card a{color:var(--primary-color);text-decoration:none}.contact-card a:hover{text-decoration:underline}.page-header{background:var(--card-bg);padding:3rem 0;text-align:center;box-shadow:var(--shadow)}.lesson-back{margin-top:1rem}.lesson-back a{display:inline-block;padding:.6rem 1rem;border-radius:12px;background:#fff;border:1px solid rgba(0,0,0,.12);text-decoration:none;color:inherit}.lesson-back a:hover{border-color:#00000040}.page-header h1{font-size:2.5rem;margin-bottom:.5rem}.page-header p{color:var(--text-light);font-size:1.1rem}@media (max-width: 768px){.hamburger{display:flex;order:3}.hero-title{font-size:2.5rem}.hero-subtitle{font-size:1.2rem}.hero-actions{flex-direction:column;align-items:center}.nav-menu{position:absolute;top:100%;left:0;right:0;background:var(--card-bg);flex-direction:column;gap:0;padding:0;box-shadow:var(--shadow-lg);max-height:0;overflow:hidden;transition:max-height .3s ease}.nav-menu.active{max-height:400px}.nav-menu li{width:100%;text-align:center;padding:1rem 0;border-bottom:1px solid var(--border-color)}.themes-grid{grid-template-columns:1fr}}.lesson-blocks{display:flex;flex-direction:column;gap:14px}.lesson-blocks .block{background:var(--card-bg);box-shadow:var(--shadow);border-radius:var(--radius);padding:1.25rem}.lesson-blocks .video-wrap{position:relative;padding-top:56.25%;border-radius:var(--radius);overflow:hidden}.lesson-blocks .video-wrap iframe{position:absolute;top:0;right:0;bottom:0;left:0;width:100%;height:100%}.lesson-blocks img{max-width:100%;height:auto;display:block;border-radius:var(--radius)}.status-msg{margin-bottom:1rem}.status-error{color:var(--danger-color)}.status-warn{color:var(--warning-color)}.pdf-assignment{margin:2rem 0;padding:1.5rem;background:#f8f9fa;border:2px dashed #4CAF50;border-radius:8px;text-align:center}.pdf-assignment h3{color:#4caf50;margin:0 0 1rem}.pdf-btn{background:linear-gradient(135deg,#4caf50,#45a049)!important;box-shadow:0 4px 12px #4caf504d;transition:all .3s ease}.pdf-btn:hover{transform:translateY(-2px);box-shadow:0 8px 25px #4caf5066}.chatbot-widget{position:fixed;bottom:20px;right:20px;z-index:9998;font-family:inherit}.chatbot-toggle{width:60px;height:60px;border-radius:50%;background:var(--primary, #6366f1);color:#fff;border:none;font-size:28px;cursor:pointer;box-shadow:0 4px 12px #00000026;transition:transform .2s,box-shadow .2s}.chatbot-toggle:hover{transform:scale(1.05);box-shadow:0 6px 16px #0003}.chatbot-window{position:fixed;bottom:90px;right:20px;width:360px;max-width:calc(100vw - 40px);height:500px;max-height:calc(100vh - 150px);background:#fff;border-radius:12px;box-shadow:0 8px 24px #00000026;display:flex;flex-direction:column;overflow:hidden}.chatbot-header{background:var(--primary, #6366f1);color:#fff;padding:16px;display:flex;justify-content:space-between;align-items:center;font-weight:600}.chatbot-close{background:transparent;border:none;color:#fff;font-size:28px;cursor:pointer;line-height:1;padding:0;width:32px;height:32px}.chatbot-messages{flex:1;overflow-y:auto;padding:16px;display:flex;flex-direction:column;gap:12px;background:var(--background, #f3f4f6)}.chatbot-message{max-width:80%;padding:10px 14px;border-radius:12px;line-height:1.4;word-wrap:break-word}.chatbot-message.user{align-self:flex-end;background:var(--primary, #6366f1);color:#fff}.chatbot-message.bot{align-self:flex-start;background:#fff;color:var(--text, #1f2937);border:1px solid #e5e7eb}.chatbot-input-container{display:flex;gap:8px;padding:12px;background:#fff;border-top:1px solid #e5e7eb}.chatbot-input{flex:1;padding:10px 12px;border:1px solid #d1d5db;border-radius:8px;font-size:14px;outline:none}.chatbot-input:focus{border-color:var(--primary, #6366f1)}.chatbot-send{padding:10px 16px;background:var(--primary, #6366f1);color:#fff;border:none;border-radius:8px;cursor:pointer;font-weight:500;transition:background .2s}.chatbot-send:hover{background:#5558e3}@media (max-width: 480px){.chatbot-window{width:calc(100vw - 40px);height:calc(100vh - 140px);bottom:80px;right:20px}}