*{box-sizing:border-box;margin:0;padding:0}.fade-in-up{animation:fadeInUp var(--transition-slow) ease forwards}.text-center{text-align:center}.text-primary{color:var(--primary-color)}.text-secondary{color:var(--text-secondary)}body{-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Oxygen,Ubuntu,Cantarell,Fira Sans,Droid Sans,Helvetica Neue,sans-serif;margin:0}code{font-family:source-code-pro,Menlo,Monaco,Consolas,Courier New,monospace}.auth-container{align-items:center;background:linear-gradient(135deg,#f0fdfa,#e0f7fa);display:flex;justify-content:center;min-height:100vh;padding:2rem}.auth-card{animation:fadeInUp .6s ease forwards;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fffffff2;border-radius:20px;box-shadow:0 8px 32px #0000001a;max-width:400px;padding:3rem;text-align:center;width:100%}.logo-section{margin-bottom:2rem}.logo-icon{background:linear-gradient(45deg,teal,#20b2aa);box-shadow:0 4px 15px #0080804d;font-size:1.5rem;height:60px;margin:0 auto 1rem;width:60px}.logo-text{font-size:1.8rem;margin-bottom:.5rem}.logo-subtitle{color:#666;font-size:.9rem;margin-bottom:1rem}.auth-title{color:#333;font-size:1.5rem;font-weight:600;margin-bottom:2rem}.loading-container{align-items:center;background:linear-gradient(135deg,#f0fdfa,#e0f7fa);display:flex;flex-direction:column;justify-content:center;min-height:100vh}.loading-spinner{animation:spin 1s linear infinite;border:4px solid #f3f3f3;border-radius:50%;border-top-color:teal;height:40px;margin-bottom:1rem;width:40px}@keyframes spin{0%{transform:rotate(0deg)}to{transform:rotate(1turn)}}.auth-card .supabase-auth-ui_ui{text-align:left}.auth-card .supabase-auth-ui_ui button{border-radius:8px;font-weight:600;padding:12px;transition:all .3s 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a{border-radius:var(--radius-lg);color:var(--text-secondary);cursor:pointer;font-weight:500;padding:var(--spacing-xs) var(--spacing-sm);text-decoration:none;transition:all var(--transition-normal)}.nav-tabs a.active{background:var(--primary-color);color:#fff}.nav-tabs a:hover{background:#0080801a;color:var(--primary-color)}@media (max-width:768px){.nav-tabs{justify-content:center;padding:0 var(--spacing-sm)}}.input-container{position:relative;transition:transform var(--transition-normal)}.input-container.focused{transform:scale(1.02)}.input-field{border:none;border-radius:var(--radius-full);box-shadow:var(--shadow-md);font-size:1.1rem;outline:none;padding:15px 25px;transition:all var(--transition-normal);width:100%}.input-field:focus{box-shadow:0 8px 30px #00808033;transform:translateY(-2px)}@media (max-width:600px){.input-field{border-radius:30px;font-size:1rem;padding:12px 16px}}.search-bar{margin:var(--spacing-lg) auto;max-width:600px}@media (max-width:600px){.search-bar{margin:var(--spacing-sm) 0;max-width:100%;padding:0 8px}}.btn{border-radius:var(--radius-lg);font-weight:600;text-align:center;transition:all var(--transition-normal)}.btn-primary{background:linear-gradient(45deg,var(--primary-color));box-shadow:0 4px 15px #0080804d}.btn-primary:hover{box-shadow:0 6px 20px #00808066;transform:translateY(-2px)}.btn-secondary{background:linear-gradient(45deg,var(--secondary-color));box-shadow:0 4px 15px #ff6f614d;color:#fff}.btn-secondary:hover{box-shadow:0 6px 20px #ff6f6166;transform:translateY(-2px)}.btn-link{background:#ff6f611a;border:none;color:var(--secondary-color)}.btn-link:hover{background:var(--secondary-color);color:#fff;transform:translateY(-2px)}.btn-small{font-size:.9rem;padding:10px 20px}.btn-medium{font-size:1rem;padding:12px 24px}.btn-large{font-size:1.1rem;padding:15px 30px}.sell-now-btn{background:linear-gradient(45deg,var(--primary-color));border:none;border-radius:var(--radius-lg);box-shadow:0 4px 15px #0080804d;color:#fff;cursor:pointer;font-weight:600;padding:12px 24px;transition:all var(--transition-normal)}.sell-now-btn:hover{box-shadow:0 6px 20px #00808066;transform:translateY(-2px)}.hero-section{margin:var(--spacing-lg) auto;max-width:1400px;padding:0 var(--spacing-lg)}.greeting{-webkit-text-fill-color:#0000;background:linear-gradient(45deg,var(--primary-color));-webkit-background-clip:text;background-clip:text;font-size:3rem;font-weight:700;margin-bottom:var(--spacing-sm)}.hero-title{color:var(--text-primary);font-size:2rem;font-weight:600;margin-bottom:var(--spacing-lg)}.hero-description{color:var(--text-secondary);font-size:1.2rem;line-height:1.6;margin:var(--spacing-lg) 0;margin-left:auto;margin-right:auto;max-width:800px}.hero-image{background-position:50%;background-size:cover;border-radius:var(--radius-md);box-shadow:0 8px 30px #00000026;display:block;height:300px;margin:var(--spacing-lg) auto;object-fit:cover;width:300px}.logout-link{background:#ff6f611a;border-radius:var(--radius-lg);color:var(--secondary-color);display:inline-block;font-weight:600;margin:var(--spacing-sm);padding:10px 20px;text-decoration:none;transition:all var(--transition-normal)}.logout-link:hover{background:var(--secondary-color);color:#fff}@media (max-width:768px){.hero-section{margin:var(--spacing-sm) auto;padding:0 var(--spacing-sm)}.greeting{font-size:2rem}.hero-title{font-size:1.5rem}}.features-section{grid-gap:var(--spacing-lg);display:grid;gap:var(--spacing-lg);grid-template-columns:repeat(auto-fit,minmax(400px,1fr));margin:var(--spacing-lg) auto;max-width:1400px;padding:0 var(--spacing-lg)}.feature-title{color:var(--primary-color);font-size:1.8rem;font-weight:600;margin-bottom:var(--spacing-md);text-align:center}.feature-image{background-position:50%;background-size:cover;border-radius:var(--radius-sm);box-shadow:var(--shadow-md);display:block;height:200px;margin:var(--spacing-sm) 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li a:hover{background:#0080801a;color:teal;transform:translateX(4px)}.sidebar ul li a.active{background:teal;box-shadow:0 4px 15px #0080804d;color:#fff}@media (max-width:1024px){.sidebar{position:static}}@media (max-width:768px){.sidebar{padding:1rem}}.dashboard-grid{grid-gap:1.5rem;display:grid;gap:1.5rem;grid-template-columns:repeat(auto-fit,minmax(300px,1fr));margin-bottom:2rem}.dashboard-card{animation:fadeInUp .6s ease forwards;background:#fff;border-left:4px solid teal;border-radius:16px;box-shadow:0 4px 20px #00000014;padding:1.5rem;transition:all .3s ease}.dashboard-card:hover{box-shadow:0 8px 30px #0000001f;transform:translateY(-4px)}.dashboard-card:first-child{animation-delay:.1s}.dashboard-card:nth-child(2){animation-delay:.2s}.dashboard-card:nth-child(3){animation-delay:.3s}.dashboard-card:nth-child(4){animation-delay:.4s}.card-header{gap:12px;margin-bottom:1rem}.card-header,.card-icon{align-items:center;display:flex}.card-icon{background:#0080801a;border-radius:10px;color:teal;font-size:18px;height:40px;justify-content:center;width:40px}.card-header h3{color:#333;font-size:1.1rem;margin:0}.card-content{color:#666;line-height:1.6}.card-content p{margin:0 0 1rem}.stats-grid{grid-gap:1rem;display:grid;gap:1rem;grid-template-columns:repeat(2,1fr);margin-top:1rem}.stat-item{background:#0080800d;border-radius:12px;padding:1rem;text-align:center}.stat-number{color:teal;font-size:2rem;margin:0}.stat-label{color:#666;font-size:.9rem;margin-top:.5rem}.action-buttons{display:flex;flex-wrap:wrap;gap:1rem;margin-top:1rem}.btn{display:inline-block;font-family:inherit;font-size:.9rem;padding:10px 20px;text-decoration:none;transition:all .3s ease}.btn-primary{background:teal}.btn-secondary{background:#0080801a;color:teal}.btn:hover{box-shadow:0 4px 15px #0003;transform:translateY(-2px)}.btn:active{transform:translateY(0)}@media (max-width:768px){.dashboard-grid{grid-template-columns:1fr}.action-buttons{flex-direction:column}.stats-grid{grid-template-columns:1fr}}@media (max-width:480px){.dashboard-card{padding:1rem}}.section-content{-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px);background:#fffffff2;border-radius:20px;box-shadow:0 8px 32px #0000001a;padding:2rem}.profile-info{color:#666;line-height:1.6;margin-top:20px}.profile-info p{margin-bottom:1rem}.profile-info strong{color:teal}.books-list,.purchases-list{grid-gap:1.5rem;display:grid;gap:1.5rem;grid-template-columns:repeat(auto-fill,minmax(300px,1fr));margin-top:1.5rem}.book-item,.purchase-item{animation:fadeInUp .6s ease forwards;background:#fff;border-left:4px solid teal;border-radius:16px;box-shadow:0 4px 20px #00000014;padding:1.5rem;transition:all .3s ease}.book-item:hover,.purchase-item:hover{box-shadow:0 8px 30px #0000001f;transform:translateY(-4px)}.loading{color:#666;font-size:1.2em;padding:2rem}.welcome-section{align-items:center;background:linear-gradient(135deg,teal,#20b2aa);border-radius:16px;color:#fff;display:flex;gap:1.5rem;justify-content:space-between;margin-bottom:2rem;padding:2rem}.welcome-text h2{font-size:1.8rem;margin-bottom:.5rem;margin-top:0}.welcome-text p{margin:0;opacity:.9}.logout-link{background:#fff3;border-radius:8px;cursor:pointer;padding:.5rem 1rem;transition:all .3s ease}.logout-link:hover{background:#ffffff4d;transform:translateY(-2px)}@keyframes fadeInUp{0%{opacity:0;transform:translateY(30px)}to{opacity:1;transform:translateY(0)}}@media (max-width:768px){.section-content{padding:1rem}.welcome-section{flex-direction:column;text-align:center}.books-list,.purchases-list{grid-template-columns:1fr}}@media (max-width:480px){.section-content,.welcome-section{padding:1rem}}.search-filters{align-items:center;display:flex;gap:16px;margin-bottom:24px}.search-bar{flex:1 1;min-width:450px;position:relative}.search-input{border:2px solid #e5e7eb;border-radius:12px;font-size:16px;padding:12px 16px 12px 44px;transition:all .2s;width:100%}.search-input:focus{border-color:#2dd4bf;box-shadow:0 0 0 3px #2dd4bf1a;outline:none}.search-icon{color:#9ca3af;left:16px;position:absolute;top:50%;transform:translateY(-50%)}.filter-select{background:#fff;border:2px solid #e5e7eb;border-radius:12px;cursor:pointer;font-size:14px;padding:12px 16px;transition:all .2s}.filter-select:focus{border-color:#2dd4bf;outline:none}@media (max-width:768px){.search-filters{flex-direction:column}.search-bar{min-width:100%}}.book-card{margin:0 auto}.book-image{height:100%;width:100%}.quick-stats{grid-gap:16px;display:grid;gap:16px;grid-template-columns:repeat(auto-fit,minmax(200px,1fr));margin-bottom:32px}.stat-card{background:#f8fafc;border-radius:12px;padding:20px;text-align:center}.stat-number{color:#2dd4bf;font-size:28px;font-weight:700;margin-bottom:4px}.stat-label{color:#6b7280;font-size:14px}.textbook-market{background:linear-gradient(135deg,#667eea,#764ba2);min-height:100vh;padding-bottom:60px}.books-grid{padding-top:20px}.book-card{box-shadow:0 2px 8px #0000001a;overflow:visible;transition:transform .2s ease,box-shadow .2s ease}.book-card:hover{box-shadow:0 8px 24px #00000026;transform:translateY(-4px)}.btn{border:none;border-radius:8px;cursor:pointer;flex:1 1;font-size:14px;font-weight:500;padding:8px 16px;transition:all .2s}.btn-primary{background:#2dd4bf;color:#fff}.btn-primary:hover{background:#14b8a6}.floating-action{align-items:center;background:#2dd4bf;border:none;border-radius:50%;bottom:24px;box-shadow:0 8px 25px #2dd4bf4d;color:#fff;cursor:pointer;display:flex;height:64px;justify-content:center;padding:16px;position:fixed;right:24px;transition:all .3s;width:64px}.floating-action:hover{box-shadow:0 12px 35px #2dd4bf66;transform:scale(1.1)}.loading,.no-results{color:#6b7280;padding:40px}@media (max-width:768px){.main-content{padding:16px 8px}.content-container{padding:8px}.content-card{padding:24px}.books-grid{gap:16px;grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}}@media (max-width:480px){.books-grid{gap:12px;grid-template-columns:1fr}}.content-container{padding:var(--spacing-md)}.content-card{background:var(--card-background);border-radius:var(--radius-md);box-shadow:var(--shadow-md);padding:var(--spacing-lg)}.page-header{margin-bottom:var(--spacing-lg)}.page-title{color:var(--text-primary);margin-bottom:var(--spacing-xs)}.page-subtitle{color:var(--text-secondary)}.grid{grid-gap:var(--spacing-md);display:grid;gap:var(--spacing-md);grid-template-columns:repeat(auto-fill,minmax(280px,1fr));margin-bottom:var(--spacing-md)}.error-message,.success-message{border-radius:var(--radius-sm);margin-bottom:var(--spacing-md);padding:var(--spacing-md)}.loading,.no-results{color:var(--text-secondary);padding:var(--spacing-xl);text-align:center}@media (max-width:768px){.content-container{padding:var(--spacing-sm)}.content-card{padding:var(--spacing-md)}.grid{gap:var(--spacing-sm);grid-template-columns:repeat(auto-fill,minmax(240px,1fr))}}@media (max-width:480px){.grid{gap:var(--spacing-xs);grid-template-columns:1fr}}:root{--primary-color:teal;--primary-light:#20b2aa;--secondary-color:#ff6f61;--background-gradient:linear-gradient(135deg,#667eea,#764ba2);--card-background:#fffffff2;--text-primary:#333;--text-secondary:#666;--text-light:#fffc;--spacing-xs:0.5rem;--spacing-sm:1rem;--spacing-md:1.5rem;--spacing-lg:2rem;--spacing-xl:3rem;--radius-sm:15px;--radius-md:20px;--radius-lg:25px;--radius-full:50px;--shadow-sm:0 2px 10px #0000001a;--shadow-md:0 4px 20px #0000001a;--shadow-lg:0 8px 32px #0000001a;--shadow-xl:0 12px 40px #00000026;--transition-fast:0.2s ease;--transition-normal:0.3s ease;--transition-slow:0.6s ease}.main-content{box-sizing:border-box;padding:32px 24px;width:100%}.content-card{background:#fff;border-radius:16px;box-shadow:0 10px 25px #0000001a;margin:0 auto;max-width:1200px;padding:24px;width:100%}.left-content{align-items:center;display:flex;gap:12px}.content-container{box-sizing:border-box;display:flex;flex-direction:row;gap:24px;margin:0 auto;max-width:1200px;padding:16px;width:100%}.cart-section{flex:2 1;min-width:0}.summary-container{flex:1 1;min-width:300px}.cart-section,.summary-section{background:#fff;border-radius:16px;box-shadow:0 10px 25px #0000001a;padding:32px}.summary-section{height:-webkit-fit-content;height:fit-content;position:-webkit-sticky;position:sticky;top:32px}.page-header{align-items:center;display:flex;justify-content:space-between}.page-title{font-size:32px}.cart-count{background:#2dd4bf;border-radius:20px;color:#fff;font-size:14px;font-weight:600;padding:4px 12px}.cart-empty{color:#6b7280;padding:64px 32px;text-align:center}.cart-empty-icon{font-size:64px;margin-bottom:16px}.cart-empty-title{color:#374151;font-size:24px;font-weight:600;margin-bottom:8px}.cart-empty-text{font-size:16px;margin-bottom:24px}.cart-item{border-bottom:1px solid #f3f4f6;display:flex;gap:20px;padding:24px 0}.cart-item:last-child{border-bottom:none}.item-image{align-items:center;background:#f8f9fa;border:1px solid #e5e7eb;border-radius:8px;display:flex;flex-shrink:0;height:100px;justify-content:center;overflow:hidden;width:80px}.cart-book-image{background-color:#fff;height:100%;object-fit:contain;width:100%}.cart-book-placeholder,.cart-book-placeholder-fallback{align-items:center;background-color:#f3f4f6;color:#9ca3af;display:flex;height:100%;justify-content:center;width:100%}.item-details{flex:1 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