@import url("https://fonts.googleapis.com/css2?family=Jost:wght@400;700&display=swap");:root{--side-padding: 3rem;--color-black: #000;--color-white: #fff;--color-light-gray: #eee;--color-medium-gray: #888;--color-dark-gray: #555;--color-lighter-gray: #ccc;--color-background-gray: #f9f9f9;--color-light-background: #f5f5f5;--color-primary: #e00004;--color-secondary: #edf6ff;--color-accent: #badeff;--color-gradient-dark-start: #1f1f1f;--color-gradient-dark-middle: #2c2c2c;--color-gradient-dark-end: #1a1a1a}*{margin:0;padding:0;box-sizing:border-box}body,button,input,select,textarea{font-family:"Jost",sans-serif;font-size:1.125rem}body{color:var(--color-black);line-height:1.6;padding-top:80px}.container{max-width:1200px;margin:0 auto;padding:0 var(--side-padding)}.logo{width:42px;border-radius:6px}.header{position:fixed;top:0;left:0;right:0;z-index:1000;background:var(--color-white);border-bottom:1px solid var(--color-light-gray);padding:20px 0}.header .header-top{display:flex;justify-content:space-between;align-items:center}.header .left-section{display:flex;align-items:center;gap:15px}.header .nav-menu-mobile{display:none}.menu-toggle{display:none;background:none;border:none;cursor:pointer;padding:0;width:30px;height:24px;flex-direction:column;justify-content:center;align-items:center;position:relative}.menu-toggle span{width:25px;height:3px;background:var(--color-black);border-radius:2px;transition:all .3s ease;position:absolute;left:50%;transform:translateX(-50%)}.menu-toggle span:nth-child(1){top:0}.menu-toggle span:nth-child(2){top:50%;transform:translate(-50%, -50%)}.menu-toggle span:nth-child(3){bottom:0}.menu-toggle.active span:nth-child(1){top:50%;transform:translate(-50%, -50%) rotate(-45deg)}.menu-toggle.active span:nth-child(2){opacity:0}.menu-toggle.active span:nth-child(3){bottom:50%;transform:translate(-50%, 50%) rotate(45deg)}.nav-menu{display:flex}.nav-menu a{margin:0 15px;text-decoration:none;color:var(--color-black);font-weight:500}.get-started-btn{background:var(--color-primary);color:var(--color-white);padding:10px 20px;border-radius:6px;font-weight:bold;text-decoration:none}.login-btn{background:none;color:var(--color-primary);padding:10px 20px;border-radius:6px;font-weight:bold;text-decoration:none}.auth-body,.signin-body{padding-top:0}.auth-fullscreen,.signin-page-fullscreen{min-height:100vh;display:flex;align-items:center;justify-content:center;background:var(--color-light-background);padding:20px}.auth-card,.signin-form-container{background:var(--color-white);border-radius:12px;padding:40px;box-shadow:0 4px 20px rgba(0,0,0,.1);width:100%;max-width:400px;text-align:center}.auth-card .logo,.signin-form-container .logo{margin-bottom:25px}.auth-card h1,.signin-form-container h1{font-size:1.8rem;margin-bottom:8px;color:var(--color-black)}.auth-subtitle,.signin-subtitle{color:var(--color-dark-gray);margin-bottom:30px}.auth-content,.message-content{text-align:left;margin-bottom:20px}.auth-content p,.message-content p{margin-bottom:16px;color:var(--color-dark-gray);line-height:1.6}.auth-content ul,.message-content ul,.auth-content ol,.message-content ol{margin:16px 0;padding-left:24px}.auth-content ul li,.message-content ul li,.auth-content ol li,.message-content ol li{margin-bottom:8px;color:var(--color-dark-gray);line-height:1.6}.auth-content strong,.message-content strong{color:var(--color-black);font-weight:600}.auth-content em,.message-content em{font-style:italic}.auth-content a,.message-content a{color:var(--color-primary);text-decoration:none;font-weight:500}.auth-content a:hover,.message-content a:hover{text-decoration:underline}.signin-form .form-group{margin-bottom:20px;text-align:left}.signin-form .form-group label{display:block;margin-bottom:6px;font-weight:500;color:var(--color-black)}.signin-form .form-group input{width:100%;padding:12px 16px;border:2px solid var(--color-light-gray);border-radius:6px;transition:border-color .3s ease}.signin-form .form-group input:focus{outline:none;border-color:var(--color-primary)}.signin-form .form-group input#code{text-align:center;letter-spacing:.5em;font-weight:bold}.signin-form .form-options{display:flex;justify-content:space-between;align-items:center;margin-bottom:30px}.signin-form .form-options .checkbox-container{display:flex;align-items:center;cursor:pointer}.signin-form .form-options .checkbox-container input[type=checkbox]{margin-right:8px;width:auto}.signin-form .form-options .forgot-password{color:var(--color-primary);text-decoration:none}.signin-form .form-options .forgot-password:hover{text-decoration:underline}.signin-form .signin-btn{width:100%;background:var(--color-primary);color:var(--color-white);padding:14px 20px;border:none;border-radius:6px;font-weight:bold;cursor:pointer;transition:background-color .3s ease}.signin-form .signin-btn:hover{background:color-mix(in srgb, var(--color-primary) 90%, #000)}.signup-prompt{text-align:center;margin-top:25px;color:var(--color-dark-gray)}.signup-prompt a{color:var(--color-primary);text-decoration:none;font-weight:500}.signup-prompt a:hover{text-decoration:underline}.dashboard-page{height:100vh;background:var(--color-light-background);display:flex;flex-direction:column}.dashboard-header{flex-shrink:0;padding:8px 20px;border-bottom:1px solid var(--color-light-gray);background:var(--color-white)}.dashboard-header .dashboard-nav{display:flex;justify-content:space-between;align-items:center}.dashboard-body{flex-grow:1;display:flex;flex-direction:row;min-height:0}.dashboard-sidebar{width:240px;background:var(--color-white);border-right:1px solid var(--color-light-gray);display:flex;flex-direction:column;flex-shrink:0}.sidebar-nav{display:flex;flex-direction:column;padding:20px 0;flex-grow:1}.sidebar-nav .sidebar-link{display:flex;align-items:center;gap:12px;padding:12px 20px;text-decoration:none;color:var(--color-dark-gray);font-weight:500;transition:all .2s ease;border-left:3px solid rgba(0,0,0,0)}.sidebar-nav .sidebar-link:hover{background:var(--color-background-gray);color:var(--color-black)}.sidebar-nav .sidebar-link.active{background:var(--color-background-gray);color:var(--color-primary);border-left-color:var(--color-primary)}.sidebar-nav .sidebar-link .sidebar-icon{font-size:1.25rem;width:24px;text-align:center}.sidebar-nav .signout-link{margin-top:auto;color:var(--color-medium-gray)}.sidebar-nav .signout-link:hover{color:var(--color-primary);background:var(--color-background-gray)}.dashboard-main{flex-grow:1;display:flex;flex-direction:column;min-width:0}.dashboard-container{flex-grow:1;min-height:0;overflow-y:auto;padding:0 20px}.dashboard-footer{flex-shrink:0;background:var(--color-white);border-top:1px solid var(--color-light-gray);padding:12px 20px}.dashboard-footer p{text-align:center;color:var(--color-medium-gray);font-size:.9rem;margin:0}.dashboard-content{display:flex;flex-direction:column;max-width:800px;margin:0 auto;padding:40px 20px}.manage-subscription-btn{background:none;color:var(--color-primary);border:2px solid var(--color-primary);padding:10px 20px;border-radius:6px;font-weight:500;cursor:pointer;text-decoration:none;display:inline-block;transition:all .3s ease}.manage-subscription-btn:hover{background:var(--color-primary);color:var(--color-white)}.dashboard-content{padding:40px 0}.dashboard-content h1{font-size:2.5rem;margin-bottom:30px;color:var(--color-black)}.section-description{color:var(--color-medium-gray);font-size:1.05rem;margin-bottom:40px;line-height:1.6}.language-grid{display:grid;grid-template-columns:repeat(auto-fit, minmax(180px, 1fr));gap:20px;margin-bottom:40px}.language-card{background:var(--color-white);border:2px solid var(--color-light-gray);border-radius:12px;padding:30px 20px;text-align:center;cursor:pointer;transition:all .2s ease;position:relative}.language-card:hover{border-color:var(--color-primary);transform:translateY(-2px);box-shadow:0 4px 15px rgba(0,0,0,.1)}.language-card.active{border-color:var(--color-primary);background:var(--color-secondary)}.language-flag{font-size:3rem;margin-bottom:15px}.language-name{font-size:1.1rem;color:var(--color-black);font-weight:600}.language-check{position:absolute;top:12px;right:12px;width:24px;height:24px;background:var(--color-primary);color:var(--color-white);border-radius:50%;display:none;align-items:center;justify-content:center;font-weight:bold;font-size:.9rem}.language-card.active .language-check{display:flex}.language-info{background:var(--color-background-gray);border-left:4px solid var(--color-primary);padding:20px;border-radius:8px}.language-info p{margin:0;color:var(--color-dark-gray);line-height:1.6}.language-info p strong{color:var(--color-black);font-weight:500}.books-list,.courses-list{display:flex;flex-direction:column;gap:20px}.book-item,.course-item{background:var(--color-white);padding:25px;border-radius:12px;box-shadow:0 2px 10px rgba(0,0,0,.05);transition:transform .2s ease,box-shadow .2s ease}.book-item:hover,.course-item:hover{transform:translateY(-2px);box-shadow:0 4px 20px rgba(0,0,0,.1)}.book-item h3,.course-item h3{font-size:1.25rem;margin-bottom:8px;color:var(--color-black)}.book-item p,.course-item p{color:var(--color-dark-gray);font-size:.9rem;margin:0}.book-item{display:flex;justify-content:space-between;align-items:center}.book-item .book-link{color:var(--color-primary);text-decoration:none;font-weight:500;white-space:nowrap}.book-item .book-link:hover{text-decoration:underline}.course-item-header{display:flex;justify-content:space-between;align-items:flex-start;gap:20px;margin-bottom:15px}.course-item-info{flex:1;min-width:0}.course-item-meta{display:flex;align-items:center;gap:12px;margin-top:8px}.course-modules{font-size:.9rem;color:var(--color-medium-gray);font-weight:500}.course-item-link{flex-shrink:0;color:var(--color-primary);text-decoration:none;font-weight:600;font-size:1rem;white-space:nowrap;transition:color .2s ease}.course-item-link:hover{color:color-mix(in srgb, var(--color-primary) 80%, #000);text-decoration:underline}.progress-bar{width:100%;height:8px;background:var(--color-light-gray);border-radius:4px;overflow:hidden;margin-bottom:8px}.progress-fill{height:100%;background:var(--color-primary);border-radius:4px;transition:width .3s ease}.progress-text{font-size:.85rem;color:var(--color-medium-gray);font-weight:500}.back-btn{background:none;color:var(--color-dark-gray);padding:10px 20px;border-radius:6px;font-weight:500;text-decoration:none;transition:color .3s ease}.back-btn:hover{color:var(--color-primary);text-decoration:underline}.subscription-content{max-width:600px;margin:0 auto;padding:40px 20px}.subscription-content h1{font-size:2.5rem;margin-bottom:30px;color:var(--color-black)}.subscription-card{background:var(--color-white);border-radius:12px;padding:30px;box-shadow:0 2px 10px rgba(0,0,0,.05);display:flex;flex-direction:column;gap:25px}.subscription-info h3{font-size:1.1rem;margin-bottom:8px;color:var(--color-black);font-weight:600}.plan-details{display:flex;align-items:center;gap:12px}.plan-details .plan-name{font-size:1.25rem;font-weight:600;color:var(--color-black)}.plan-details .plan-status{padding:4px 12px;border-radius:20px;font-size:.85rem;font-weight:500}.plan-details .plan-status.active{background:var(--color-accent);color:var(--color-black)}.plan-details .plan-status.expired{background:var(--color-primary);color:var(--color-white)}.billing-date{font-size:1.1rem;color:var(--color-black);font-weight:500;margin:0}.status-description{color:var(--color-dark-gray);margin:0;line-height:1.5}.subscription-actions{display:flex;justify-content:space-between;gap:15px;flex-wrap:wrap;margin-top:10px}.cancel-subscription-btn{background:none;color:var(--color-primary);border:none;padding:10px 20px;border-radius:6px;font-weight:500;font-size:1rem;cursor:pointer;text-decoration:none;transition:all .3s ease}.cancel-subscription-btn:hover{text-decoration:underline}.update-payment-btn{background:var(--color-black);color:var(--color-white);padding:10px 20px;border-radius:6px;font-weight:500;font-size:1rem;text-decoration:none;transition:background-color .3s ease}.update-payment-btn:hover{background:color-mix(in srgb, var(--color-black) 85%, #fff)}.text-page{padding:40px 0}.text-content{max-width:800px;margin:0 auto;line-height:1.8}.text-content h1{font-size:2.5rem;margin-bottom:30px;color:var(--color-black)}.text-content h2{font-size:1.5rem;margin-top:40px;margin-bottom:20px;color:var(--color-black)}.text-content h3{font-size:1.25rem;margin-top:30px;margin-bottom:15px;color:var(--color-black)}.text-content p{margin-bottom:16px;color:var(--color-dark-gray)}.text-content ul,.text-content ol{margin-bottom:16px;padding-left:24px}.text-content ul li,.text-content ol li{margin-bottom:8px;color:var(--color-dark-gray)}.text-content em{font-style:italic;color:var(--color-medium-gray);font-size:.9rem}.ride-hero{padding:80px 0;background:var(--color-white)}.ride-hero .ride-hero-split{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center}.ride-hero .ride-hero-left h1{font-size:3.2rem;margin-bottom:24px;color:var(--color-black);line-height:1.2}.ride-hero .ride-hero-left h1 i{color:var(--color-primary);font-style:italic}.ride-hero .ride-hero-left .ride-hero-subtitle{font-size:1.3rem;color:var(--color-dark-gray);margin-bottom:32px;line-height:1.6}.ride-hero .ride-hero-left .ride-cta-btn{display:inline-block;padding:16px 40px;font-size:1.2rem;font-weight:700;background:var(--color-primary);color:var(--color-white);text-decoration:none;border-radius:6px;transition:all .3s ease}.ride-hero .ride-hero-left .ride-cta-btn:hover{background:color-mix(in srgb, var(--color-primary) 90%, #000);transform:translateX(4px)}.ride-hero .ride-hero-right{display:flex;justify-content:center;align-items:center}.ride-hero .ride-visual{position:relative;width:400px;height:400px}.ride-hero .ride-center{position:absolute;top:50%;left:50%;transform:translate(-50%, -50%);width:120px;height:120px;background:var(--color-primary);border-radius:50%;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 32px rgba(224,0,4,.3);z-index:2}.ride-hero .ride-center .ride-logo{color:var(--color-white);font-size:1.5rem;font-weight:700}.ride-hero .ride-node{position:absolute;padding:12px 20px;background:var(--color-white);border:2px solid var(--color-light-gray);border-radius:8px;font-size:.9rem;font-weight:600;color:var(--color-dark-gray);box-shadow:0 4px 12px rgba(0,0,0,.08);white-space:nowrap}.ride-hero .ride-node::before{content:"";position:absolute;width:2px;background:var(--color-primary);opacity:.3}.ride-hero .ride-node-1{top:0;left:50%;transform:translateX(-50%)}.ride-hero .ride-node-1::before{height:80px;top:100%;left:50%}.ride-hero .ride-node-2{right:0;top:50%;transform:translateY(-50%)}.ride-hero .ride-node-2::before{width:80px;height:2px;right:100%;top:50%}.ride-hero .ride-node-3{bottom:0;left:50%;transform:translateX(-50%)}.ride-hero .ride-node-3::before{height:80px;bottom:100%;left:50%}.ride-hero .ride-node-4{left:0;top:50%;transform:translateY(-50%)}.ride-hero .ride-node-4::before{width:80px;height:2px;left:100%;top:50%}.ride-features{padding:80px 0;background:var(--color-background-gray)}.ride-features .ride-features-header{text-align:center;margin-bottom:60px}.ride-features .ride-features-header h2{font-size:2.5rem;margin-bottom:16px;color:var(--color-black)}.ride-features .ride-features-header p{font-size:1.2rem;color:var(--color-dark-gray)}.ride-features .ride-features-list{max-width:900px;margin:0 auto}.ride-features .ride-feature-item{display:flex;gap:24px;padding:32px;margin-bottom:20px;background:var(--color-white);border-radius:12px;border-left:4px solid var(--color-primary);transition:all .3s ease}.ride-features .ride-feature-item:hover{transform:translateX(8px);box-shadow:0 4px 16px rgba(0,0,0,.1)}.ride-features .ride-feature-item .ride-feature-icon{flex-shrink:0}.ride-features .ride-feature-item .ride-feature-icon img{width:48px;height:48px}.ride-features .ride-feature-item .ride-feature-content h3{font-size:1.4rem;margin-bottom:8px;color:var(--color-black)}.ride-features .ride-feature-item .ride-feature-content p{font-size:1.05rem;color:var(--color-dark-gray);line-height:1.6}.ride-workflow{padding:80px 0;background:var(--color-white)}.ride-workflow .ride-workflow-title{text-align:center;font-size:2.5rem;margin-bottom:60px;color:var(--color-black)}.ride-workflow .ride-workflow-timeline{max-width:1000px;margin:0 auto;display:flex;align-items:center;justify-content:space-between}.ride-workflow .ride-workflow-step{display:flex;align-items:center;flex:1}.ride-workflow .ride-workflow-content{background:var(--color-background-gray);padding:32px 24px;border-radius:12px;text-align:center;flex:1;border:2px solid rgba(0,0,0,0);transition:all .3s ease}.ride-workflow .ride-workflow-content:hover{border-color:var(--color-primary);transform:scale(1.05)}.ride-workflow .ride-workflow-content .ride-workflow-number{display:inline-flex;align-items:center;justify-content:center;width:50px;height:50px;background:var(--color-primary);color:var(--color-white);font-size:1.5rem;font-weight:700;border-radius:50%;margin-bottom:16px}.ride-workflow .ride-workflow-content h3{font-size:1.3rem;margin-bottom:12px;color:var(--color-black)}.ride-workflow .ride-workflow-content p{font-size:1rem;color:var(--color-dark-gray);line-height:1.5}.ride-workflow .ride-workflow-arrow{font-size:2rem;color:var(--color-primary);margin:0 16px;flex-shrink:0}.ride-cta-block{padding:100px 0;background:linear-gradient(135deg, var(--color-gradient-dark-start) 0%, var(--color-gradient-dark-middle) 50%, var(--color-gradient-dark-end) 100%);position:relative;overflow:hidden}.ride-cta-block::before{content:"";position:absolute;top:-50%;right:-10%;width:500px;height:500px;background:var(--color-primary);opacity:.1;border-radius:50%}.ride-cta-block .ride-cta-container{max-width:800px;margin:0 auto;text-align:center;position:relative;z-index:1}.ride-cta-block .ride-cta-content h2{font-size:2.8rem;color:var(--color-white);margin-bottom:20px;line-height:1.3}.ride-cta-block .ride-cta-content p{font-size:1.3rem;color:var(--color-light-gray);margin-bottom:40px}.ride-cta-block .ride-cta-content .ride-cta-primary{display:inline-block;padding:20px 56px;font-size:1.3rem;font-weight:700;background:var(--color-primary);color:var(--color-white);text-decoration:none;border-radius:8px;transition:all .3s ease;box-shadow:0 8px 24px rgba(224,0,4,.4)}.ride-cta-block .ride-cta-content .ride-cta-primary:hover{background:color-mix(in srgb, var(--color-primary) 85%, #000);transform:translateY(-4px);box-shadow:0 12px 32px rgba(224,0,4,.5)}.ride-roadmap{padding:80px 0 100px;background:var(--color-background-gray)}.ride-roadmap .ride-roadmap-title{text-align:center;font-size:2.5rem;margin-bottom:16px;color:var(--color-black)}.ride-roadmap .ride-roadmap-subtitle{text-align:center;font-size:1.2rem;color:var(--color-dark-gray);margin-bottom:60px}.ride-roadmap .ride-roadmap-items{display:grid;grid-template-columns:repeat(auto-fit, minmax(280px, 1fr));gap:32px;max-width:1000px;margin:0 auto}.ride-roadmap .ride-roadmap-card{background:var(--color-white);padding:36px 28px;border-radius:12px;box-shadow:0 2px 12px rgba(0,0,0,.08);position:relative;transition:all .3s ease}.ride-roadmap .ride-roadmap-card:hover{transform:translateY(-6px);box-shadow:0 8px 24px rgba(0,0,0,.12)}.ride-roadmap .ride-roadmap-card .ride-roadmap-badge{display:inline-block;padding:6px 14px;background:var(--color-primary);color:var(--color-white);font-size:.75rem;font-weight:700;text-transform:uppercase;border-radius:20px;margin-bottom:16px;letter-spacing:.5px}.ride-roadmap .ride-roadmap-card h3{font-size:1.4rem;margin-bottom:12px;color:var(--color-black)}.ride-roadmap .ride-roadmap-card p{font-size:1.05rem;color:var(--color-dark-gray);line-height:1.6}.catalog-filter{display:flex;gap:10px;justify-content:center;margin-bottom:40px;flex-wrap:wrap}.filter-btn{padding:10px 24px;border:2px solid var(--color-light-gray);background:var(--color-white);color:var(--color-dark-gray);border-radius:6px;font-weight:500;font-size:1rem;cursor:pointer;transition:all .2s ease}.filter-btn:hover{border-color:var(--color-primary);color:var(--color-primary)}.filter-btn.active{background:var(--color-primary);border-color:var(--color-primary);color:var(--color-white)}.catalog-grid{display:grid;grid-template-columns:repeat(auto-fill, minmax(320px, 1fr));gap:25px;margin-bottom:40px}.course-card{display:flex;flex-direction:column;background:var(--color-white);border:1px solid var(--color-light-gray);border-radius:12px;padding:25px;transition:all .2s ease;box-shadow:0 2px 10px rgba(0,0,0,.05);cursor:pointer}.course-card:hover{transform:translateY(-4px);box-shadow:0 8px 25px rgba(0,0,0,.12);border-color:var(--color-primary)}.course-card h3{font-size:1.25rem;margin:15px 0 10px 0;color:var(--color-black)}.course-card p{color:var(--color-dark-gray);font-size:.95rem;line-height:1.6;flex-grow:1;margin-bottom:15px}.course-header{display:flex;justify-content:space-between;align-items:center;gap:10px}.course-badge{padding:4px 12px;border-radius:20px;font-size:.85rem;font-weight:600}.course-badge.python{background:rgba(55,118,171,.0823529412);color:#3776ab}.course-badge.typescript{background:rgba(49,120,198,.0823529412);color:#3178c6}.course-badge.rust{background:rgba(206,66,43,.0823529412);color:#ce422b}.course-difficulty{padding:4px 12px;border-radius:20px;font-size:.8rem;font-weight:500}.course-difficulty.difficulty-1{background:rgba(16,185,129,.0823529412);color:#059669}.course-difficulty.difficulty-1::after{content:"Beginner"}.course-difficulty.difficulty-2{background:rgba(245,158,11,.0823529412);color:#d97706}.course-difficulty.difficulty-2::after{content:"Intermediate"}.course-difficulty.difficulty-3{background:rgba(239,68,68,.0823529412);color:#dc2626}.course-difficulty.difficulty-3::after{content:"Advanced"}.course-meta{display:flex;gap:15px;font-size:.9rem;color:var(--color-medium-gray);margin-bottom:15px}.course-meta span{display:flex;align-items:center;gap:4px}.course-link{display:inline-block;color:var(--color-primary);text-decoration:none;font-weight:600;transition:all .2s ease}.course-link:hover{color:color-mix(in srgb, var(--color-primary) 80%, #000);text-decoration:underline}.demo-category{margin-bottom:50px}.demo-category 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rgba(224,0,4,.3)}.sidebar-features{display:flex;flex-direction:column;gap:12px}.feature-item{display:flex;align-items:center;gap:10px;font-size:1rem;color:var(--color-dark-gray)}.feature-item .feature-icon{color:var(--color-primary);font-weight:bold;font-size:1.2rem}.sidebar-info{background:var(--color-white);border-radius:12px;padding:25px;box-shadow:0 2px 10px rgba(0,0,0,.05)}.sidebar-info h3{font-size:1.2rem;color:var(--color-black);margin-bottom:20px;padding-bottom:15px;border-bottom:1px solid var(--color-light-gray)}.info-item{padding:10px 0;font-size:1rem;color:var(--color-dark-gray);display:flex;justify-content:space-between;border-bottom:1px solid var(--color-light-gray)}.info-item:last-child{border-bottom:none}.info-item strong{color:var(--color-black);font-weight:600}.sidebar-free{background:var(--color-background-gray);border-radius:12px;padding:25px;margin-top:20px;text-align:center}.sidebar-free h3{font-size:1.2rem;color:var(--color-black);margin-bottom:15px}.sidebar-free p{color:var(--color-dark-gray);font-size:.95rem;line-height:1.5;margin-bottom:20px}.free-cover-link{display:block;margin:0 auto 20px;width:75%}.free-cover-image{width:100%;height:auto;display:block;border-radius:8px;box-shadow:0 2px 4px rgba(0,0,0,.1),0 4px 8px rgba(0,0,0,.12),0 8px 16px rgba(0,0,0,.14),0 16px 32px rgba(0,0,0,.16)}.free-pdf-btn{display:block;width:100%;padding:14px;background:var(--color-white);color:var(--color-primary);border:2px solid var(--color-primary);border-radius:8px;font-size:1rem;font-weight:bold;text-align:center;text-decoration:none;cursor:pointer;transition:all .2s ease}.free-pdf-btn:hover{background:var(--color-primary);color:var(--color-white);transform:translateY(-2px);box-shadow:0 4px 15px rgba(224,0,4,.3)}@media (max-width: 968px){.course-detail-container{flex-direction:column}.course-sidebar{width:100%}.course-header-detail{padding:25px}.course-header-detail h1{font-size:2rem}.course-header-detail .course-intro{font-size:1.1rem}.course-section{padding:25px}.course-section h2{font-size:1.5rem}}.error-page{min-height:100vh;display:flex;align-items:center;justify-content:center;background:linear-gradient(135deg, var(--color-gradient-dark-start) 0%, var(--color-gradient-dark-middle) 50%, var(--color-gradient-dark-end) 100%);padding:2rem}.error-content{max-width:600px;text-align:center;color:var(--color-white)}.error-code{font-size:8rem;font-weight:700;line-height:1;color:var(--color-primary);margin-bottom:1rem;text-shadow:0 4px 8px rgba(224,0,4,.3)}.error-content h1{font-size:2.5rem;font-weight:700;margin-bottom:1rem;color:var(--color-white)}.error-message{font-size:1.25rem;color:rgba(255,255,255,.8);margin-bottom:2.5rem;line-height:1.6}.error-actions{display:flex;gap:1rem;justify-content:center;margin-bottom:3rem;flex-wrap:wrap}.error-btn{padding:14px 32px;font-size:1.125rem;font-weight:600;text-decoration:none;border-radius:8px;transition:all .3s ease;display:inline-block}.error-btn.primary{background:var(--color-primary);color:var(--color-white)}.error-btn.primary:hover{background:#c00003;transform:translateY(-2px);box-shadow:0 4px 12px rgba(224,0,4,.4)}.error-btn.secondary{background:rgba(0,0,0,0);color:var(--color-white);border:2px solid var(--color-white)}.error-btn.secondary:hover{background:rgba(255,255,255,.1);transform:translateY(-2px)}.error-links{margin-top:2rem;padding-top:2rem;border-top:1px solid rgba(255,255,255,.1)}.error-links p{font-size:1rem;color:rgba(255,255,255,.6);margin-bottom:1rem}.error-links ul{list-style:none;padding:0;margin:0;display:flex;flex-direction:column;gap:.75rem}.error-links ul li{font-size:1rem}.error-links a{color:rgba(255,255,255,.8);text-decoration:none;transition:color .3s ease}.error-links a:hover{color:var(--color-primary)}@media (max-width: 767px){.error-code{font-size:5rem}.error-content h1{font-size:2rem}.error-message{font-size:1.125rem}.error-actions{flex-direction:column}.error-btn{width:100%}}