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.token-input{background:var(--bg-secondary);border-color:var(--gray-600)}.exchange-rate{background:rgba(102,126,234,.1);border:1px solid rgba(102,126,234,.2);border-radius:var(--radius-lg);color:var(--primary-purple-dark);font-weight:600;padding:var(--space-md)}.buy-tokens-btn,.purchase-btn,.sell-tokens-btn,.submit-btn,.verify-btn{align-items:center;background:var(--gradient-primary);border:none;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);color:#fff;cursor:pointer;display:flex;font-size:1rem;font-weight:600;justify-content:center;min-height:44px;overflow:hidden;padding:var(--space-sm) var(--space-lg);position:relative;transition:all .3s cubic-bezier(.4,0,.2,1);width:100%}.buy-tokens-btn:hover:not(:disabled),.purchase-btn:hover:not(:disabled),.sell-tokens-btn:hover:not(:disabled),.submit-btn:hover:not(:disabled),.verify-btn:hover:not(:disabled){box-shadow:var(--shadow-lg);transform:translateY(-2px)}.approve-btn{background:linear-gradient(135deg,var(--warning) 0,#fbbf24 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h2{color:var(--text-primary);font-size:1.75rem;font-weight:700;margin-bottom:var(--space-lg)}.courses-grid{display:grid;gap:var(--space-lg);grid-template-columns:repeat(auto-fill,minmax(300px,1fr));margin-top:var(--space-lg);max-width:100%}@media (min-width:1024px){.courses-grid{grid-template-columns:repeat(3,1fr)}}.course-card{background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);box-shadow:var(--shadow-md);overflow:hidden;padding:var(--space-xl);position:relative;transition:all .3s cubic-bezier(.4,0,.2,1)}[data-theme=dark] .course-card{border:1px solid var(--gray-600)}.course-card:before{background:var(--gradient-primary);content:"";height:4px;left:0;opacity:0;position:absolute;right:0;top:0;transition:opacity .3s ease}.course-card:hover{box-shadow:var(--shadow-xl);transform:translateY(-8px)}.course-card:hover:before{opacity:1}.course-header{align-items:flex-start;display:flex;justify-content:space-between;margin-bottom:var(--space-md)}.course-header h3{color:var(--text-primary);font-size:1.25rem;font-weight:700;line-height:1.3;margin:0}.course-price{background:var(--gradient-primary);border-radius:var(--radius-full);box-shadow:var(--shadow-sm);color:#fff;font-size:.875rem;font-weight:600;padding:var(--space-xs) var(--space-sm);white-space:nowrap}.course-description{color:var(--text-secondary);line-height:1.6;margin-bottom:var(--space-md)}.course-creator,.course-status{color:var(--text-tertiary);font-size:.875rem;margin-bottom:var(--space-xs)}.course-actions{margin-top:var(--space-md)}.course-card .approve-btn,.course-card .purchase-btn{align-items:center;display:flex;justify-content:center;min-height:44px;width:100%}.approval-step,.sell-flow{width:100%}.sell-flow 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label{color:var(--text-secondary);display:block;font-size:.875rem;font-weight:600;letter-spacing:.05em;margin-bottom:var(--space-xs);text-transform:uppercase}.address{background:var(--bg-primary);border:1px solid var(--gray-300);border-radius:var(--radius-md);color:var(--text-primary);font-family:SF Mono,Monaco,Cascadia Code,Roboto Mono,Consolas,Courier New,monospace;font-size:.875rem;overflow:hidden;padding:var(--space-md);position:relative;word-break:break-all}[data-theme=dark] .address{border-color:var(--gray-600)}.address:before{content:"🔗";opacity:.5;position:absolute;right:var(--space-sm);top:50%;transform:translateY(-50%)}.address-container{align-items:center;display:flex;gap:var(--space-sm);width:100%}.address-container .address{cursor:pointer;flex:1;margin:0;transition:all .2s ease}.address-container .address:hover{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.1)}.address-actions{align-items:center;display:flex;flex-shrink:0;gap:var(--space-xs)}.address-action-btn{align-items:center;background:var(--bg-tertiary);border:none;border:1px solid var(--gray-200);border-radius:var(--radius-md);cursor:pointer;display:flex;font-size:14px;height:36px;justify-content:center;transition:all .2s ease;width:36px}.address-action-btn:hover{background:var(--primary-purple);border-color:var(--primary-purple);box-shadow:0 2px 8px rgba(102,126,234,.3);color:#fff;transform:translateY(-1px)}[data-theme=dark] .address-action-btn{background:var(--gray-700);border-color:var(--gray-600)}[data-theme=dark] .address-action-btn:hover{background:var(--primary-purple);border-color:var(--primary-purple)}.edit-name{flex-wrap:wrap;gap:var(--space-sm)}.display-name,.edit-name{align-items:center;display:flex}.display-name{gap:var(--space-md);justify-content:space-between}.display-name span{background:var(--bg-primary);border:1px solid var(--gray-300);border-radius:var(--radius-md);color:var(--text-primary);font-size:1.125rem;font-weight:500;min-width:200px;padding:var(--space-sm) var(--space-md)}[data-theme=dark] .display-name span{border-color:var(--gray-600)}.cancel-btn,.edit-btn,.save-btn{border:none;border-radius:var(--radius-md);cursor:pointer;font-size:.875rem;font-weight:600;overflow:hidden;padding:var(--space-sm) var(--space-lg);position:relative;transition:all .3s ease}.edit-btn{background:var(--bg-primary);border:2px solid var(--primary-purple);color:var(--primary-purple)}.edit-btn:hover{background:var(--primary-purple);transform:translateY(-1px)}.edit-btn:hover,.save-btn{box-shadow:var(--shadow-sm);color:#fff}.save-btn{background:linear-gradient(135deg,var(--success) 0,#34d399 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h3:before{align-items:center;background:var(--gradient-primary);border-radius:50%;color:#fff;content:"📚";display:flex;font-size:1.5rem;height:40px;justify-content:center;width:40px}.courses-list{display:grid;gap:var(--space-lg)}.course-item{background:var(--bg-secondary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);overflow:hidden;padding:var(--space-xl);position:relative;transition:all .3s cubic-bezier(.4,0,.2,1)}[data-theme=dark] .course-item{border-color:var(--gray-700)}.course-item:before{background:linear-gradient(135deg,var(--success) 0,#34d399 100%);content:"";height:4px;left:0;opacity:0;position:absolute;right:0;top:0;transition:opacity .3s ease}.course-item:hover{box-shadow:var(--shadow-xl);transform:translateY(-5px)}.course-item:hover:before{opacity:1}.course-item .course-header{align-items:flex-start;display:flex;gap:var(--space-md);justify-content:space-between;margin-bottom:var(--space-md)}.course-item .course-header h4{color:var(--text-primary);flex:1;font-size:1.25rem;font-weight:700;line-height:1.3;margin:0}.course-item .course-price{background:linear-gradient(135deg,var(--success) 0,#34d399 100%);border-radius:var(--radius-full);box-shadow:var(--shadow-sm);color:#fff;font-size:.875rem;font-weight:600;padding:var(--space-xs) var(--space-sm);white-space:nowrap}.course-item .course-body{margin-bottom:var(--space-lg)}.course-item .course-description{color:var(--text-secondary);line-height:1.6;margin-bottom:var(--space-md)}.course-meta{color:var(--text-tertiary);display:grid;font-size:.875rem;gap:var(--space-md);grid-template-columns:1fr 1fr}.course-meta span{align-items:center;background:var(--bg-primary);border:1px solid var(--gray-300);border-radius:var(--radius-md);display:flex;gap:var(--space-xs);padding:var(--space-xs) var(--space-sm)}[data-theme=dark] .course-meta span{border-color:var(--gray-600)}.course-meta .creator:before{content:"👨‍💻"}.course-meta .date:before{content:"📅"}.access-btn{align-items:center;background:linear-gradient(135deg,var(--success) 0,#34d399 100%);border:none;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);color:#fff;cursor:default;display:flex;font-size:1rem;font-weight:600;gap:var(--space-xs);justify-content:center;padding:var(--space-sm) var(--space-lg);width:100%}.course-item.loading{animation:pulse 2s ease-in-out infinite;background:var(--bg-tertiary);color:var(--text-tertiary);padding:var(--space-xl);text-align:center}.exchange-records{background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);overflow:hidden;padding:var(--space-xl);position:relative}[data-theme=dark] .exchange-records{border-color:var(--gray-700)}.exchange-records:before{background:var(--gradient-primary);content:"";height:4px;left:0;position:absolute;right:0;top:0}.records-header{align-items:center;display:flex;justify-content:space-between;margin-bottom:var(--space-lg)}.exchange-records h3{align-items:center;color:var(--text-primary);display:flex;font-size:1.75rem;font-weight:700;gap:var(--space-sm);margin:0}.exchange-records h3:before{align-items:center;background:var(--gradient-primary);border-radius:50%;color:#fff;content:"📊";display:flex;font-size:1.5rem;height:40px;justify-content:center;width:40px}.refresh-btn,.retry-btn{background:var(--bg-secondary);border:2px solid var(--primary-purple);border-radius:var(--radius-md);color:var(--text-primary);cursor:pointer;font-size:.875rem;font-weight:600;padding:var(--space-xs) var(--space-md);transition:all .3s ease}.refresh-btn:hover,.retry-btn:hover{background:var(--primary-purple);box-shadow:var(--shadow-sm);color:#fff;transform:translateY(-1px)}.records-list{display:grid;gap:var(--space-md)}.record-item{background:var(--bg-secondary);border:1px solid var(--gray-200);border-radius:var(--radius-lg);overflow:hidden;padding:var(--space-lg);position:relative;transition:all .3s ease}[data-theme=dark] .record-item{border-color:var(--gray-700)}.record-item:hover{box-shadow:var(--shadow-md);transform:translateY(-2px)}.record-item.buy:before{background:linear-gradient(135deg,var(--success) 0,#34d399 100%)}.record-item.buy:before,.record-item.sell:before{bottom:0;content:"";left:0;position:absolute;top:0;width:4px}.record-item.sell:before{background:linear-gradient(135deg,#ef4444,#f87171)}.record-main{margin-bottom:var(--space-md)}.record-type{align-items:center;display:flex;justify-content:space-between;margin-bottom:var(--space-sm)}.type-badge{border-radius:var(--radius-full);font-size:.875rem;font-weight:600;padding:var(--space-xs) var(--space-sm)}.type-badge.buy{background:rgba(34,197,94,.1);border:1px solid rgba(34,197,94,.2);color:var(--success)}.type-badge.sell{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.2);color:#ef4444}.record-time{color:var(--text-tertiary);font-size:.875rem}.record-amounts{display:grid;gap:var(--space-md);grid-template-columns:1fr 1fr}.amount-item{display:flex;flex-direction:column;gap:var(--space-xs)}.amount-item label{color:var(--text-secondary);font-size:.875rem;font-weight:500}.eth-amount,.token-amount{font-family:SF Mono,Monaco,Cascadia Code,Roboto Mono,Consolas,Courier New,monospace;font-size:1.125rem;font-weight:700}.eth-amount{color:var(--primary-purple)}.token-amount{color:var(--success)}.record-details{border-top:1px solid var(--gray-200);display:grid;gap:var(--space-md);grid-template-columns:1fr 1fr;padding-top:var(--space-md)}[data-theme=dark] .record-details{border-color:var(--gray-700)}.detail-item{display:flex;flex-direction:column;gap:var(--space-xs)}.detail-item label{color:var(--text-tertiary);font-size:.8rem;letter-spacing:.05em;text-transform:uppercase}.detail-item span{color:var(--text-secondary)}.detail-item span,.tx-link{font-family:SF Mono,Monaco,Cascadia Code,Roboto Mono,Consolas,Courier New,monospace;font-size:.875rem}.tx-link{color:var(--primary-purple);text-decoration:none;transition:all .3s ease}.tx-link:hover{color:var(--primary-purple-dark);text-decoration:underline}.empty-state,.error-state,.loading-state{background:var(--bg-secondary);border:1px dashed var(--gray-300);border-radius:var(--radius-lg);color:var(--text-secondary);padding:var(--space-xl);text-align:center}[data-theme=dark] .empty-state,[data-theme=dark] .error-state,[data-theme=dark] .loading-state{border-color:var(--gray-600)}.empty-state:before{content:"📭"}.empty-state:before,.loading-state:before{display:block;font-size:2rem;margin-bottom:var(--space-sm)}.loading-state:before{content:"⏳"}.error-state:before{content:"❌";display:block;font-size:2rem;margin-bottom:var(--space-sm)}.page-exchange-records{margin-top:var(--space-xl)}.page-exchange-records .exchange-records{border:1px solid var(--gray-200);box-shadow:var(--shadow-xl)}[data-theme=dark] .page-exchange-records .exchange-records{border-color:var(--gray-700)}.purchased-courses p,.user-profile p{background:var(--bg-secondary);border:1px dashed var(--gray-300);border-radius:var(--radius-lg);color:var(--text-secondary);font-size:1.125rem;margin-top:var(--space-md);overflow:hidden;padding:var(--space-xl);position:relative;text-align:center}[data-theme=dark] .purchased-courses p,[data-theme=dark] .user-profile p{border-color:var(--gray-600)}.purchased-courses p:before,.user-profile p:before{content:"💼";display:block;font-size:2rem;margin-bottom:var(--space-sm)}.purchased-courses p:before{content:"📖"}@media (max-width:1200px){.categories-container,.cta-container,.featured-courses-container,.hero-content,.page-container,.stats-container{padding-left:20px;padding-right:20px}}@media (max-width:1024px){.courses-grid{gap:var(--space-md);grid-template-columns:repeat(auto-fit,minmax(280px,1fr))}.main-content{padding:0 20px var(--space-xl) 20px}.header-content,.nav-list{padding:0 20px}.courses-section,.token-section{padding:var(--space-lg)}.categories-container,.featured-courses-container,.hero-content,.stats-container{max-width:none;padding:0 20px}}@media (max-width:768px){.header-content{flex-direction:column;gap:var(--space-md);text-align:center}.title{font-size:2rem}.wallet-connected{align-items:center;flex-direction:column;gap:var(--space-sm)}.courses-grid{gap:var(--space-md);grid-template-columns:1fr}.course-card{padding:var(--space-lg)}.course-header{align-items:flex-start;flex-direction:column;gap:var(--space-xs)}.course-price{align-self:flex-start}.courses-section,.token-section{padding:var(--space-md)}.main-content{gap:var(--space-lg);padding:0 16px var(--space-lg) 16px}.header-content{padding:0 16px}.table-header,.table-row{text-align:left}.info-item,.table-header,.table-row{gap:var(--space-xs);grid-template-columns:1fr}.edit-name{align-items:stretch;flex-direction:column}.display-name{align-items:flex-start;flex-direction:column;gap:var(--space-sm)}.display-name span{min-width:unset;width:100%}.course-meta{flex-direction:column;gap:var(--space-xs);grid-template-columns:1fr}.categories-container,.cta-container,.featured-courses-container,.hero-content,.page-container,.stats-container{padding-left:16px;padding-right:16px}.nav-brand{margin-left:16px}}@media (max-width:480px){.title{font-size:1.75rem}.course-card,.courses-section,.token-section{border-radius:var(--radius-lg);padding:var(--space-sm)}.approve-btn,.buy-tokens-btn,.connect-btn,.purchase-btn,.submit-btn,.verify-btn{font-size:.875rem;padding:var(--space-xs) var(--space-md)}.categories-container,.cta-container,.featured-courses-container,.hero-content,.page-container,.stats-container{padding-left:12px;padding-right:12px}.course-categories,.cta-section,.featured-courses,.hero-section,.stats-section{padding-bottom:var(--space-lg);padding-top:var(--space-lg)}}.error{background:#f8d7da;border:1px solid #f5c6cb;border-radius:8px;color:#dc3545}.error,.success{margin-top:1rem;padding:.75rem}.success{background:#d4edda;border:1px solid #c3e6cb;border-radius:8px;color:#155724}.course-id-success{font-size:.9rem;margin-top:.5rem}.course-id{background:#c3e6cb;border-radius:4px;font-family:monospace;font-weight:600;padding:.25rem .5rem}.loading{color:#666;padding:2rem;text-align:center}.course-id-display{align-items:center;display:flex;gap:.5rem}.course-id-input{background:#f8f9fa;border:1px solid #e9ecef;color:#6c757d;flex:1;font-family:monospace;font-size:.9rem}.course-id-input:focus{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.1);outline:none}.regenerate-btn{background:#6c757d;border:none;border-radius:8px;color:#fff;cursor:pointer;font-size:.9rem;padding:.75rem 1rem;transition:background .3s ease;white-space:nowrap}.regenerate-btn:hover:not(:disabled){background:#5a6268}.regenerate-btn:disabled{cursor:not-allowed;opacity:.6}.course-id-note{color:#6c757d;display:block;font-size:.8rem;margin-top:.25rem}.course-purchase-page,.courses-page,.creator-platform-page,.home-page,.tokens-page,.user-center-page{background:var(--gradient-background);display:flex;flex:1;flex-direction:column;overflow-x:hidden;width:100%}.hero-section{background:var(--gradient-background);flex-shrink:0;overflow:hidden;padding:var(--space-2xl) 0;position:relative;width:100%}.hero-content{align-items:center;box-sizing:border-box;display:grid;gap:var(--space-2xl);grid-template-columns:1fr 1fr;margin:0 auto;max-width:1200px;padding:0 24px;width:100%}.hero-text{z-index:2}.hero-title{margin:0 0 var(--space-lg) 0}.hero-title-main{background:var(--gradient-primary);-webkit-background-clip:text;display:block;font-size:3.5rem;font-weight:800;line-height:1.1;-webkit-text-fill-color:transparent;background-clip:text}.hero-title-sub{color:var(--text-secondary);display:block;font-size:1.5rem;font-weight:400;margin-top:var(--space-xs)}.hero-description{color:var(--text-secondary);font-size:1.125rem;line-height:1.7;margin-bottom:var(--space-xl)}.hero-actions{display:flex;gap:var(--space-md)}.cta-primary,.cta-secondary{align-items:center;border-radius:var(--radius-full);display:inline-flex;font-weight:600;gap:var(--space-xs);padding:var(--space-md) var(--space-xl);text-decoration:none;transition:all .3s cubic-bezier(.4,0,.2,1)}.cta-primary{background:var(--gradient-primary);box-shadow:var(--shadow-lg);color:#fff}.cta-primary:hover{box-shadow:var(--shadow-xl);color:#fff;transform:translateY(-2px)}.cta-secondary{background:var(--bg-primary);border:2px solid var(--gray-300);color:var(--text-primary)}.cta-secondary:hover{border-color:var(--primary-purple);box-shadow:var(--shadow-md);color:var(--text-primary);transform:translateY(-2px)}.hero-visual{align-items:center;display:flex;height:500px;justify-content:center;overflow:hidden;position:relative}.hero-graphic{height:100%;position:relative;width:100%}.floating-card{align-items:center;animation:float 6s ease-in-out infinite;background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);display:flex;gap:var(--space-sm);padding:var(--space-md);position:absolute}[data-theme=dark] .floating-card{border-color:var(--gray-600)}.floating-card.card-1{animation-delay:0s;left:10%;top:20%}.floating-card.card-2{animation-delay:2s;right:5%;top:60%}.floating-card.card-3{animation-delay:4s;bottom:30%;left:20%}.card-icon{align-items:center;background:var(--bg-tertiary);border-radius:var(--radius-md);display:flex;font-size:1.5rem;height:40px;justify-content:center;width:40px}.card-title{color:var(--text-primary);font-size:.875rem;font-weight:600}.card-subtitle{color:var(--text-tertiary);font-size:.75rem}.hero-center-icon{left:50%;position:absolute;top:50%;transform:translate(-50%,-50%);z-index:5}.center-logo{align-items:center;animation:pulse 3s ease-in-out infinite;background:var(--gradient-primary);border-radius:50%;box-shadow:var(--shadow-xl);display:flex;height:80px;justify-content:center;width:80px}.logo-text{color:#fff;font-size:1rem;font-weight:700}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-20px)}}.stats-section{background:var(--bg-primary);border-bottom:1px solid var(--gray-200);border-top:1px solid var(--gray-200);flex-shrink:0;overflow:hidden;padding:var(--space-2xl) 0;width:100%}[data-theme=dark] .stats-section{border-color:var(--gray-700)}.stats-container{box-sizing:border-box;margin:0 auto;max-width:1200px;padding:0 24px;width:100%}.stats-header{margin-bottom:var(--space-2xl);text-align:center}.stats-header h2{color:var(--text-primary);font-size:2.5rem;font-weight:700;margin-bottom:var(--space-md)}.stats-header p{color:var(--text-secondary);font-size:1.125rem}.stats-grid{display:grid;gap:var(--space-xl);grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.stat-card{background:var(--bg-secondary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);padding:var(--space-xl);text-align:center;transition:all .3s ease}[data-theme=dark] .stat-card{border-color:var(--gray-700)}.stat-card:hover{box-shadow:var(--shadow-lg);transform:translateY(-5px)}.stat-icon{display:block;font-size:3rem;margin-bottom:var(--space-md)}.stat-value{color:var(--primary-purple);font-size:2.5rem;font-weight:800}.stat-label,.stat-value{margin-bottom:var(--space-xs)}.stat-label{color:var(--text-primary);font-size:1.25rem;font-weight:600}.stat-description{color:var(--text-tertiary);font-size:.875rem;line-height:1.5}.course-categories{background:var(--gradient-background);flex-shrink:0;overflow:hidden;padding:var(--space-2xl) 0;width:100%}.categories-container{box-sizing:border-box;margin:0 auto;max-width:1200px;padding:0 24px;width:100%}.categories-header{margin-bottom:var(--space-2xl);text-align:center}.categories-header h2{color:var(--text-primary);font-size:2.5rem;font-weight:700;margin-bottom:var(--space-md)}.categories-header p{color:var(--text-secondary);font-size:1.125rem}.categories-grid{display:grid;gap:var(--space-lg);grid-template-columns:repeat(auto-fit,minmax(350px,1fr))}.category-card{align-items:center;background:var(--bg-primary);border:2px solid var(--gray-200);border-radius:var(--radius-xl);cursor:pointer;display:flex;gap:var(--space-md);overflow:hidden;padding:var(--space-xl);position:relative;transition:all .3s cubic-bezier(.4,0,.2,1)}[data-theme=dark] .category-card{border-color:var(--gray-700)}.category-card:before{background:var(--category-color,var(--primary-blue));content:"";height:4px;left:0;position:absolute;right:0;top:0;transform:scaleX(0);transition:transform .3s ease}.category-card.active:before,.category-card:hover:before{transform:scaleX(1)}.category-card:hover{box-shadow:var(--shadow-xl);transform:translateY(-5px)}.category-card.active,.category-card:hover{border-color:var(--category-color,var(--primary-purple))}.category-card.active{box-shadow:var(--shadow-md)}.category-icon{align-items:center;background:rgba(var(--category-color,99,102,241),.1);border-radius:var(--radius-lg);display:flex;flex-shrink:0;font-size:2rem;height:60px;justify-content:center;width:60px}.category-content{flex:1}.category-name{color:var(--text-primary);font-size:1.25rem;font-weight:700;margin:0 0 var(--space-xs) 0}.category-description{color:var(--text-secondary);line-height:1.5;margin:0 0 var(--space-sm) 0}.course-count{font-size:.875rem;font-weight:600}.category-arrow,.course-count{color:var(--category-color,var(--primary-purple))}.category-arrow{font-size:1.5rem;transition:transform .3s ease}.category-card:hover .category-arrow{transform:translateX(5px)}.featured-courses{background:var(--bg-primary);flex-shrink:0;overflow:hidden;padding:var(--space-2xl) 0;width:100%}.featured-courses-container{box-sizing:border-box;margin:0 auto;max-width:1200px;padding:0 24px;width:100%}.section-header{margin-bottom:var(--space-2xl);text-align:center}.section-header h2{color:var(--text-primary);font-size:2.5rem;font-weight:700;margin-bottom:var(--space-md)}.section-header p{color:var(--text-secondary);font-size:1.125rem}.featured-grid{display:grid;gap:var(--space-xl);grid-template-columns:repeat(auto-fit,minmax(350px,1fr))}.featured-card{background:var(--bg-secondary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);padding:var(--space-xl);position:relative;transition:all .3s ease}[data-theme=dark] .featured-card{border-color:var(--gray-700)}.featured-card:hover{box-shadow:var(--shadow-xl);transform:translateY(-5px)}.featured-badge{background:var(--gradient-primary);border-radius:var(--radius-full);color:#fff;font-size:.75rem;font-weight:600;padding:var(--space-xs) var(--space-sm);position:absolute;right:var(--space-md);top:var(--space-md)}.featured-card h3{color:var(--text-primary);font-size:1.25rem;font-weight:700;margin:0 0 var(--space-md) 0}.featured-card p{color:var(--text-secondary);line-height:1.6;margin-bottom:var(--space-lg)}.featured-meta{display:flex;font-size:.875rem;gap:var(--space-md)}.featured-meta span{background:var(--bg-primary);border:1px solid var(--gray-300);border-radius:var(--radius-md);padding:var(--space-xs) var(--space-sm)}[data-theme=dark] .featured-meta span{border-color:var(--gray-600)}.difficulty{background:rgba(102,126,234,.1)!important;border-color:var(--primary-purple)!important;color:var(--primary-purple)}.students{color:var(--success)}.price{color:var(--warning);font-weight:600}.cta-section{background:var(--gradient-primary);color:#fff;flex-shrink:0;overflow:hidden;padding:var(--space-2xl) 0;text-align:center;width:100%}.cta-container{box-sizing:border-box;margin:0 auto;max-width:800px;padding:0 24px;width:100%}.cta-section h2{font-size:2.5rem;font-weight:700;margin-bottom:var(--space-md)}.cta-section p{font-size:1.25rem;margin-bottom:var(--space-xl);opacity:.9}.cta-buttons{display:flex;gap:var(--space-md);justify-content:center}.cta-buttons .cta-primary{background:#fff;color:var(--primary-purple)}.cta-buttons .cta-primary:hover{color:var(--primary-purple);transform:translateY(-2px)}.cta-buttons .cta-secondary{background:transparent;border-color:#fff;color:#fff}.cta-buttons .cta-secondary:hover{background:#fff;color:var(--primary-purple)}.page-container{margin:0 auto;max-width:1200px;padding:0 24px var(--space-2xl) 24px}.courses-search,.page-container{box-sizing:border-box;width:100%}.courses-search{background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);display:flex;justify-content:center;margin-bottom:var(--space-xl);padding:var(--space-lg)}[data-theme=dark] .courses-search{border-color:var(--gray-700)}.search-container{max-width:600px;position:relative;width:100%}.courses-content{box-sizing:border-box;width:100%}.filters-row{align-items:center;display:flex;gap:var(--space-md);margin-bottom:var(--space-md)}.search-box{flex:1;min-width:300px}.search-input-container{position:relative}.search-icon{color:var(--text-tertiary);left:var(--space-sm);position:absolute;top:50%;transform:translateY(-50%)}.search-input{background:var(--bg-primary);border:1px solid var(--gray-300);border-radius:var(--radius-lg);color:var(--text-primary);font-size:1rem;padding:var(--space-sm) var(--space-sm) var(--space-sm) 2.5rem;transition:all .2s ease;width:100%}.search-input:focus{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.1);outline:none}.category-filter,.sort-filter{min-width:150px}.category-select,.sort-select{appearance:none;background:var(--bg-primary);background-image:linear-gradient(45deg,transparent 50%,var(--gray-500) 50%),linear-gradient(135deg,var(--gray-500) 50%,transparent 50%);background-position:calc(100% - 15px) calc(1em + 2px),calc(100% - 10px) calc(1em + 2px);background-repeat:no-repeat;background-size:5px 5px,5px 5px;border:2px solid var(--gray-300);border-radius:var(--radius-lg);color:var(--text-primary);cursor:pointer;font-size:1rem;padding:var(--space-sm) var(--space-md);transition:all .2s ease;width:100%}.category-select:hover,.sort-select:hover{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.1)}.category-select:focus,.sort-select:focus{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.2);outline:none}.quick-filters{border-top:1px solid var(--gray-200);padding-top:var(--space-md)}[data-theme=dark] .quick-filters{border-color:var(--gray-700)}.filter-tags{display:flex;flex-wrap:wrap;gap:var(--space-sm)}.filter-tag{background:var(--bg-secondary);border:1px solid var(--gray-300);border-radius:var(--radius-full);color:var(--text-secondary);cursor:pointer;font-size:.875rem;padding:var(--space-xs) var(--space-md);transition:all .2s ease}[data-theme=dark] .filter-tag{border-color:var(--gray-700)}.filter-tag.active,.filter-tag:hover{background:var(--primary-purple);border-color:var(--primary-purple);color:#fff}.courses-header{margin-bottom:var(--space-xl)}.courses-header h2{color:var(--text-primary);font-size:2rem;font-weight:700;margin-bottom:var(--space-xs)}.search-results{color:var(--text-tertiary);font-style:italic}.no-courses{color:var(--text-secondary);padding:var(--space-2xl);text-align:center}.no-courses-icon{font-size:4rem;margin-bottom:var(--space-lg)}.no-courses h3{color:var(--text-primary);font-size:1.5rem;margin-bottom:var(--space-md)}.tokens-intro{align-items:center;box-sizing:border-box;display:grid;gap:var(--space-xl);grid-template-columns:2fr 1fr;margin-bottom:var(--space-2xl);width:100%}.intro-content h2{color:var(--text-primary);font-size:2.5rem;font-weight:700;margin-bottom:var(--space-md)}.intro-content p{color:var(--text-secondary);font-size:1.125rem;line-height:1.6}.balance-card{background:var(--gradient-primary);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);color:#fff;padding:var(--space-xl);text-align:center}.balance-label{font-size:.875rem;margin-bottom:var(--space-xs);opacity:.8}.balance-amount{font-size:2.5rem;font-weight:800;margin-bottom:var(--space-xs)}.balance-usd{font-size:1rem;opacity:.7}.exchange-section{background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);margin-bottom:var(--space-2xl);padding:var(--space-xl)}[data-theme=dark] .exchange-section{border-color:var(--gray-700)}.usage-guide{box-sizing:border-box;margin-bottom:var(--space-2xl);width:100%}.usage-guide h3{color:var(--text-primary);font-size:1.75rem;font-weight:700;margin-bottom:var(--space-lg);text-align:center}.guide-grid{display:grid;gap:var(--space-lg);grid-template-columns:repeat(auto-fit,minmax(250px,1fr))}.guide-item{background:var(--bg-secondary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);padding:var(--space-xl);text-align:center;transition:all .3s ease}[data-theme=dark] .guide-item{border-color:var(--gray-700)}.guide-item:hover{box-shadow:var(--shadow-lg);transform:translateY(-5px)}.guide-icon{font-size:2.5rem;margin-bottom:var(--space-md)}.guide-item h4{color:var(--text-primary);font-size:1.25rem;font-weight:600;margin-bottom:var(--space-sm)}.guide-item p{color:var(--text-secondary);line-height:1.5}.transaction-history{box-sizing:border-box;margin-bottom:var(--space-2xl);width:100%}.transaction-history h3{color:var(--text-primary);font-size:1.75rem;font-weight:700;margin-bottom:var(--space-lg)}.history-table{background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);overflow:hidden}[data-theme=dark] .history-table{border-color:var(--gray-700)}.history-header{background:var(--bg-tertiary);color:var(--text-secondary);display:grid;font-size:.875rem;font-weight:600;gap:var(--space-md);grid-template-columns:2fr 1fr 1fr 1fr;letter-spacing:.05em;padding:var(--space-md) var(--space-lg);text-transform:uppercase}.history-empty{color:var(--text-secondary);padding:var(--space-2xl);text-align:center}.empty-icon{font-size:3rem;margin-bottom:var(--space-md)}.history-empty p{color:var(--text-primary);font-size:1.125rem;margin-bottom:var(--space-xs)}.history-empty small{color:var(--text-tertiary)}.risk-notice{background:rgba(245,158,11,.1);border:1px solid rgba(245,158,11,.3);border-radius:var(--radius-xl);margin-top:var(--space-xl);padding:var(--space-xl)}.notice-header{align-items:center;display:flex;gap:var(--space-sm);margin-bottom:var(--space-md)}.notice-icon{font-size:1.25rem}.notice-header h4{color:var(--warning);font-size:1.25rem;font-weight:600;margin:0}.risk-notice ul{list-style:none;margin:0;padding:0}.risk-notice li{color:var(--text-secondary);padding:var(--space-xs) 0;padding-left:var(--space-lg);position:relative}.risk-notice li:before{color:var(--warning);content:"•";font-weight:700;left:0;position:absolute}@media (max-width:768px){.hero-content{gap:var(--space-xl);grid-template-columns:1fr;text-align:center}.hero-title-main{font-size:2.5rem}.hero-actions{justify-content:center}.stats-grid{gap:var(--space-lg);grid-template-columns:repeat(auto-fit,minmax(200px,1fr))}.categories-grid,.featured-grid{grid-template-columns:1fr}.cta-buttons{align-items:center;flex-direction:column}.filters-row{flex-direction:column;gap:var(--space-sm)}.search-box{min-width:unset}.tokens-intro{gap:var(--space-lg)}.guide-grid,.history-header,.tokens-intro{grid-template-columns:1fr}.history-header{gap:var(--space-xs)}}.staking-system{background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);margin-bottom:var(--space-xl);padding:var(--space-xl)}[data-theme=dark] .staking-system{border-color:var(--gray-700)}.staking-type-tabs{background:var(--bg-secondary);border-radius:var(--radius-lg);box-shadow:var(--shadow-sm);display:flex;margin-bottom:30px;padding:4px}.type-button{background:transparent;border:none;border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;flex:1;font-size:16px;font-weight:600;padding:12px 24px;transition:all .3s ease}.type-button.active{background:var(--gradient-primary);box-shadow:var(--shadow-md);color:#fff}.type-button:hover:not(.active){background:var(--bg-primary);color:var(--text-primary)}.staking-system h3{font-size:1.75rem;font-weight:700;margin-bottom:var(--space-lg)}.staking-system h3,.staking-system h4{color:var(--text-primary);text-align:center}.staking-system h4{font-size:1.5rem;font-weight:600;margin-bottom:var(--space-md)}.staking-paused{background:rgba(239,68,68,.1);border:1px solid rgba(239,68,68,.3);border-radius:var(--radius-lg);color:var(--error);padding:var(--space-xl);text-align:center}.staking-paused h3{font-size:1.5rem;margin-bottom:var(--space-sm)}.stake-flow{margin-top:var(--space-lg)}.approval-step{text-align:center}.approval-note{color:var(--text-tertiary);display:block;font-size:.875rem;margin-top:var(--space-sm)}.approve-btn,.stake-btn{background:var(--gradient-primary);border:none;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);color:#fff;cursor:pointer;font-size:1rem;font-weight:600;padding:var(--space-md) var(--space-lg);transition:all .3s ease;width:100%}.approve-btn:hover,.stake-btn:hover{box-shadow:var(--shadow-lg);transform:translateY(-2px)}.approve-btn:disabled,.stake-btn:disabled{background:var(--gray-300);box-shadow:var(--shadow-sm);color:var(--gray-600);cursor:not-allowed;transform:none}.system-stats{background:var(--bg-secondary);border-radius:var(--radius-lg);display:grid;gap:var(--space-md);grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-bottom:var(--space-lg);padding:var(--space-lg)}.stat-item{align-items:center;display:flex;flex-direction:column;padding:var(--space-sm);text-align:center}.stat-item span:first-child{color:var(--text-tertiary);font-size:.875rem;font-weight:500;margin-bottom:var(--space-xs)}.stat-item span:last-child{color:var(--primary-purple);font-size:1.25rem;font-weight:700}.user-info{background:rgba(102,126,234,.05);border:1px solid rgba(102,126,234,.2);border-radius:var(--radius-lg);display:grid;gap:var(--space-md);grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-bottom:var(--space-lg);padding:var(--space-lg)}.info-item{align-items:center;display:flex;flex-direction:column;padding:var(--space-sm);text-align:center}.info-item span:first-child{color:var(--text-secondary);font-size:.875rem;font-weight:500;margin-bottom:var(--space-xs)}.info-item span:last-child{color:var(--primary-purple-dark);font-size:1.125rem;font-weight:700}.staking-tabs{background:var(--bg-tertiary);border-radius:var(--radius-lg);display:flex;gap:var(--space-xs);margin-bottom:var(--space-lg);padding:var(--space-xs)}.tab-button{background:transparent;border:none;border-radius:var(--radius-md);color:var(--text-secondary);cursor:pointer;flex:1;font-size:1rem;font-weight:600;padding:var(--space-sm) var(--space-md);transition:all .2s ease}.tab-button.active,.tab-button:hover{background:var(--bg-primary);box-shadow:var(--shadow-sm);color:var(--primary-purple)}.rewards-form,.stake-form,.withdraw-form{display:grid;gap:var(--space-lg)}.stake-input,.withdraw-input{background:var(--bg-primary);border:2px solid var(--gray-300);border-radius:var(--radius-lg);color:var(--text-primary);font-size:1rem;padding:var(--space-md);transition:all .2s ease}.stake-input:focus,.withdraw-input:focus{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.1);outline:none}.staking-info,.withdraw-info{background:var(--bg-tertiary);border-left:4px solid var(--primary-purple);border-radius:var(--radius-lg);margin-bottom:var(--space-md);padding:var(--space-md)}.staking-info p,.withdraw-info p{color:var(--text-secondary);font-size:.875rem;line-height:1.5;margin:var(--space-xs) 0}.staking-info p:first-child,.withdraw-info p:first-child{margin-top:0}.staking-info p:last-child,.withdraw-info p:last-child{margin-bottom:0}.claim-btn,.stake-btn,.withdraw-btn{background:var(--gradient-primary);border:none;border-radius:var(--radius-lg);box-shadow:var(--shadow-md);color:#fff;cursor:pointer;font-size:1rem;font-weight:600;overflow:hidden;padding:var(--space-md) var(--space-xl);position:relative;transition:all .3s cubic-bezier(.4,0,.2,1)}.withdraw-btn{background:linear-gradient(135deg,var(--warning) 0,#fbbf24 100%)}.claim-btn{background:linear-gradient(135deg,var(--success) 0,#34d399 100%)}.claim-btn:hover:not(:disabled),.stake-btn:hover:not(:disabled),.withdraw-btn:hover:not(:disabled){box-shadow:var(--shadow-lg);transform:translateY(-2px)}.claim-btn:disabled,.stake-btn:disabled,.withdraw-btn:disabled{box-shadow:var(--shadow-sm);cursor:not-allowed;opacity:.6;transform:none}.rewards-info{background:var(--bg-secondary);border:1px solid var(--gray-200);border-radius:var(--radius-lg);margin-bottom:var(--space-lg);padding:var(--space-xl);text-align:center}[data-theme=dark] .rewards-info{border-color:var(--gray-700)}.rewards-info h4{color:var(--text-primary);font-size:1.25rem;font-weight:700;margin-bottom:var(--space-md)}.rewards-info p{color:var(--text-secondary);font-size:1rem;margin:var(--space-sm) 0}.rewards-info p:first-of-type{color:var(--success);font-size:1.125rem;font-weight:600}.rewards-info p:last-of-type{color:var(--text-tertiary);font-size:.875rem}.rewards-description{color:var(--text-tertiary)!important;font-size:.875rem!important;font-style:italic;margin-top:var(--space-md)!important}.staking-section{background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);box-sizing:border-box;padding:var(--space-xl);width:100%}[data-theme=dark] .staking-section{border-color:var(--gray-700)}@media (max-width:768px){.system-stats,.user-info{gap:var(--space-sm);grid-template-columns:1fr}.staking-tabs{flex-direction:column}.tab-button{text-align:center}.rewards-info,.staking-system{padding:var(--space-lg)}}@media (max-width:480px){.staking-system{border-radius:var(--radius-lg);padding:var(--space-md)}.staking-system h3{font-size:1.5rem}.system-stats,.user-info{padding:var(--space-md)}.info-item,.stat-item{padding:var(--space-xs)}.claim-btn,.stake-btn,.withdraw-btn{font-size:.875rem;padding:var(--space-sm) var(--space-lg)}}.courses-sort{align-items:center;background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);display:flex;justify-content:flex-end;margin-bottom:var(--space-xl);padding:var(--space-lg)}[data-theme=dark] .courses-sort{border-color:var(--gray-700)}.sort-section{align-items:center;display:flex;gap:var(--space-sm)}.sort-label{color:var(--text-secondary);font-size:.875rem;font-weight:600;margin:0}.sort-select-wrapper{align-items:center;display:flex;position:relative}.sort-select{appearance:none;background:var(--bg-primary);background-color:var(--bg-primary);border:2px solid var(--gray-300);border-radius:var(--radius-lg);color:var(--text-primary);cursor:pointer;font-size:.875rem;font-weight:500;min-width:150px;padding:var(--space-sm) 2.5rem var(--space-sm) var(--space-md);transition:all .2s ease}.sort-select:hover{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.1)}.sort-select:focus{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.2);outline:none}[data-theme=dark] .sort-select{background-color:var(--bg-secondary);border-color:var(--gray-600)}.sort-arrow{color:var(--text-tertiary);pointer-events:none;position:absolute;right:var(--space-sm);transition:transform .2s ease}.sort-select:hover+.sort-arrow{color:var(--primary-purple)}.sort-select:focus+.sort-arrow{transform:rotate(180deg)}.courses-filter-bar{align-items:center;background:var(--bg-primary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);box-shadow:var(--shadow-sm);display:flex;gap:var(--space-lg);margin-bottom:var(--space-xl);padding:var(--space-lg)}[data-theme=dark] .courses-filter-bar{border-color:var(--gray-700)}.courses-filter-bar .search-container{flex:1;max-width:none;position:relative}.courses-filter-bar .sort-container{align-items:center;display:flex;flex-shrink:0;gap:var(--space-sm)}.courses-filter-bar .sort-label{color:var(--text-secondary);font-size:.875rem;font-weight:600;margin:0;white-space:nowrap}.courses-filter-bar .sort-select-wrapper{align-items:center;display:flex;position:relative}.courses-filter-bar .sort-select{appearance:none;background:var(--bg-primary);border:2px solid var(--gray-300);border-radius:var(--radius-lg);color:var(--text-primary);cursor:pointer;font-size:.875rem;font-weight:500;min-width:160px;outline:none;padding:var(--space-sm) 2.5rem var(--space-sm) var(--space-md);transition:all .2s ease}.courses-filter-bar .sort-select:hover{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.1)}.courses-filter-bar .sort-select:focus{border-color:var(--primary-purple);box-shadow:0 0 0 3px rgba(102,126,234,.2)}.courses-filter-bar .sort-arrow{color:var(--text-tertiary);pointer-events:none;position:absolute;right:var(--space-sm);transition:transform .2s ease}.courses-filter-bar .sort-select:hover+.sort-arrow{color:var(--primary-purple)}.courses-filter-bar .sort-select:focus+.sort-arrow{transform:rotate(180deg)}@media (max-width:768px){.courses-filter-bar{align-items:stretch;flex-direction:column;gap:var(--space-md)}.courses-filter-bar .search-container{max-width:none}.courses-filter-bar .sort-container{flex-direction:column;gap:var(--space-xs);justify-content:center;text-align:center}.courses-filter-bar .sort-select{min-width:200px}}@media (max-width:480px){.courses-filter-bar{padding:var(--space-md)}.courses-filter-bar .sort-select{font-size:.75rem;min-width:180px;padding:var(--space-xs) 2rem var(--space-xs) var(--space-sm)}}.course-list-empty,.course-list-loading{background:var(--bg-secondary);border:1px dashed var(--gray-300);border-radius:var(--radius-lg);color:var(--text-secondary);margin:var(--space-xl) 0;padding:var(--space-2xl);text-align:center}[data-theme=dark] .course-list-empty,[data-theme=dark] .course-list-loading{border-color:var(--gray-600)}.course-list-empty:before{content:"🔍"}.course-list-empty:before,.course-list-loading:before{display:block;font-size:3rem;margin-bottom:var(--space-md)}.course-list-loading:before{content:"⏳"}.course-card-loading{animation:pulse 2s ease-in-out infinite;background:var(--bg-tertiary);border:1px solid var(--gray-200);border-radius:var(--radius-xl);color:var(--text-tertiary);padding:var(--space-xl);text-align:center}[data-theme=dark] .course-card-loading{border-color:var(--gray-700)}@keyframes pulse{0%,to{opacity:1}50%{opacity:.6}}@media (max-width:768px){.courses-sort{justify-content:center;padding:var(--space-md)}.sort-section{flex-direction:column;gap:var(--space-xs);text-align:center}.sort-select{min-width:200px}}@media (max-width:480px){.courses-sort{padding:var(--space-sm)}.sort-select{font-size:.75rem;min-width:180px;padding:var(--space-xs) 2rem var(--space-xs) var(--space-sm)}}