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var(--ease-out-expo);margin-right:8px;flex-shrink:0}.mobile-menu-btn:hover{background:var(--bg-hover);color:var(--text-primary);border-color:var(--border-visible)}}.graph-section.fullscreen-mobile{position:fixed;inset:0;z-index:1001;background:var(--bg-primary)}.graph-section.fullscreen-mobile .graph-toolbar{position:absolute;top:0;left:0;right:0;background:#12121ae6;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.fullscreen-toggle-btn{display:none}@media(max-width:768px){.fullscreen-toggle-btn{display:flex}}.landing-page{flex:1;overflow-y:auto;overflow-x:hidden}.hero-section{min-height:calc(100vh - 64px);min-height:calc(100dvh - 64px);display:flex;align-items:center;justify-content:center;padding:80px 60px;background:radial-gradient(ellipse 80% 50% at 50% -20%,var(--accent-glow) 0%,transparent 50%),radial-gradient(ellipse 60% 40% at 90% 80%,var(--accent-glow) 0%,transparent 50%),var(--bg-primary)}.hero-inner{display:grid;grid-template-columns:1fr 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var(--ease-out-expo)}.btn-hero.primary{background:linear-gradient(135deg,var(--accent-primary) 0%,var(--accent-secondary) 100%);color:#fff;box-shadow:0 4px 20px var(--accent-glow)}.btn-hero.primary:hover{transform:translateY(-2px);box-shadow:0 8px 30px var(--accent-glow)}.btn-hero.secondary{background:var(--bg-elevated);color:var(--text-primary);border:1px solid var(--border-visible)}.btn-hero.secondary:hover{background:var(--bg-hover);border-color:var(--accent-primary)}.hero-visual{display:flex;justify-content:center;perspective:1000px}.visual-card{width:420px;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:16px;overflow:hidden;-webkit-backdrop-filter:blur(20px);backdrop-filter:blur(20px);box-shadow:var(--shadow-lg),0 0 0 1px var(--border-subtle) inset,0 0 80px var(--accent-glow);transform:rotateY(-5deg) rotateX(5deg);transition:transform var(--duration-normal) var(--ease-out-expo)}.visual-card:hover{transform:rotateY(0) rotateX(0)}.card-header{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-elevated);border-bottom:1px solid var(--border-subtle)}.card-dots{display:flex;gap:6px}.card-dots span{width:10px;height:10px;border-radius:50%;background:var(--bg-hover)}.card-dots span:first-child{background:var(--color-error)}.card-dots span:nth-child(2){background:var(--color-warning)}.card-dots span:last-child{background:var(--color-success)}.card-title{font-size:.8rem;color:var(--text-muted)}.card-content{padding:20px}.demo-equation{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-primary);border-radius:var(--radius-sm);margin-bottom:16px}.eq-label{font-size:.75rem;color:var(--accent-primary);text-transform:uppercase;letter-spacing:.05em}.demo-equation code{font-family:var(--font-mono);font-size:1rem;color:var(--text-primary)}.demo-steps{display:flex;flex-direction:column;gap:8px;margin-bottom:16px}.demo-steps .step-item{display:flex;align-items:center;gap:12px;padding:10px 14px;background:var(--bg-primary);border-radius:var(--radius-sm);font-size:.875rem;color:var(--text-secondary);border-left:3px solid transparent;transition:all var(--duration-fast) var(--ease-out-expo);margin-bottom:0;border:none;box-shadow:none}.demo-steps .step-item.active{background:var(--accent-glow);border-left-color:var(--accent-primary);color:var(--text-primary)}.demo-steps .step-num{width:22px;height:22px;display:flex;align-items:center;justify-content:center;background:var(--bg-elevated);border-radius:50%;font-size:.75rem;font-weight:600;color:var(--text-muted)}.demo-steps .step-item.active .step-num{background:var(--accent-primary);color:var(--bg-primary)}.demo-graph{background:var(--bg-primary);border-radius:var(--radius-sm);padding:16px}.mini-graph{width:100%;height:100px}.features-section{padding:100px 60px;background:var(--bg-secondary)}.section-title{text-align:center;font-size:2.25rem;font-weight:700;color:var(--text-primary);margin:0 0 60px}.features-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1200px;margin:0 auto}.feature-card{padding:32px;background:var(--bg-card);border:1px solid var(--border-subtle);border-radius:var(--radius-lg);transition:all var(--duration-normal) var(--ease-out-expo)}.feature-card:hover{border-color:var(--border-active);transform:translateY(-2px);box-shadow:0 0 30px var(--accent-glow)}.feature-icon{width:48px;height:48px;border-radius:50%;background:var(--accent-glow);display:flex;align-items:center;justify-content:center;color:var(--accent-primary);margin-bottom:20px}.feature-card h3{font-size:1.25rem;font-weight:600;color:var(--text-primary);margin:0 0 12px}.feature-card p{font-size:.9rem;line-height:1.6;color:var(--text-secondary);margin:0}.cta-section{padding:100px 60px;background:radial-gradient(ellipse 60% 50% at 50% 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p{font-size:1rem;line-height:1.7}.featured-collections-section{padding:80px 60px;background:var(--bg-secondary)}.featured-collections-section .section-subtitle{text-align:center;color:var(--text-secondary);font-size:1.1rem;margin-top:-16px;margin-bottom:40px}.featured-collections-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1200px;margin:0 auto}.featured-collections-cta{text-align:center;margin-top:40px}.btn-view-all{display:inline-flex;align-items:center;gap:8px;padding:12px 28px;border-radius:8px;background:var(--accent-primary);color:#fff;font-size:1rem;font-weight:500;text-decoration:none;transition:background .2s}.btn-view-all:hover{background:var(--accent-secondary)}.how-it-works-section{padding:100px 60px;background:var(--bg-primary)}.steps-flow{display:flex;align-items:center;justify-content:center;gap:16px;max-width:1200px;margin:0 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var(--duration-fast) var(--ease-out-expo)}.topic-card:hover{border-color:var(--accent-primary);transform:translateY(-2px)}.topic-icon{flex-shrink:0;width:48px;height:48px;border-radius:12px;background:var(--accent-glow);display:flex;align-items:center;justify-content:center;color:var(--accent-primary)}.topic-card h3{font-size:1rem;font-weight:600;color:var(--text-primary);margin:0 0 4px}.topic-card p{font-size:.875rem;color:var(--text-secondary);margin:0;line-height:1.5}.landing-footer{padding:40px 60px;border-top:1px solid var(--border-subtle);background:var(--bg-secondary)}.footer-content{display:flex;align-items:center;justify-content:space-between;max-width:1200px;margin:0 auto}.footer-brand{display:flex;align-items:center;gap:12px}.footer-brand .logo{width:36px;height:36px;font-size:1.25rem}.footer-brand 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var(--ease-out-expo)}.btn-send-code:hover:not(:disabled){background:var(--accent-glow)}.btn-send-code:disabled{opacity:.55;cursor:not-allowed}.field-hint{margin:0;font-size:.75rem;color:var(--text-muted)}.auth-submit{height:48px;width:100%;padding:0 24px;background:var(--accent-primary);color:#fff;border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:all var(--duration-fast) var(--ease-out-expo);box-shadow:var(--shadow-glow);margin-top:8px}.auth-submit:hover{background:var(--accent-secondary)}.auth-error{padding:12px 16px;background:var(--color-error-bg);border:1px solid var(--color-error-bg);border-radius:var(--radius-md);color:var(--color-error);font-size:.875rem;text-align:center;margin:0}.auth-footer{text-align:center;margin-top:24px;font-size:.875rem;color:var(--text-muted)}.auth-footer a{color:var(--accent-primary);text-decoration:none;font-weight:500}.auth-footer 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.chat-input-wrapper .voice-btn svg,.welcome-input-wrapper .chat-input-wrapper .keyboard-toggle-btn svg{width:22px;height:22px}.welcome-examples{display:flex;align-items:center;justify-content:center;flex-wrap:wrap;gap:8px;color:var(--text-muted);font-size:.875rem}.welcome-examples button{padding:8px 16px;font-size:.8125rem;background:var(--bg-hover);border:1px solid var(--border-subtle);border-radius:var(--radius-full);color:var(--text-secondary);cursor:pointer;transition:all var(--duration-fast) var(--ease-out-expo)}@media(max-width:640px){.welcome-container{padding:24px 12px}.welcome-content{max-width:100%}.welcome-input-wrapper .chat-input-wrapper.math-input{--chat-toolbar-btn: 46px;--chat-field-min-height: 50px;--chat-text-field-min-height: 58px}}.welcome-examples button:hover{background:var(--bg-elevated);border-color:var(--accent-primary);color:var(--accent-primary)}.loading-container{flex:1;display:flex;align-items:center;justify-content:center}.loading-content{text-align:center}.loading-spinner{width:40px;height:40px;margin:0 auto 16px;border:3px solid var(--border-subtle);border-top-color:var(--accent-primary);border-radius:50%;animation:spin .8s linear infinite}.loading-content p{color:var(--text-muted);font-size:.875rem}.control-section{flex-shrink:0;border-top:1px solid var(--border-subtle);background:var(--bg-secondary);position:relative;z-index:10}.control-bar{display:flex;align-items:center;justify-content:space-between;padding:12px 24px}.control-left{display:flex;align-items:center;gap:16px}.session-info{display:flex;align-items:center;gap:8px}.session-indicator{width:8px;height:8px;border-radius:50%;background:var(--text-muted)}.session-indicator.active{background:var(--color-success);box-shadow:0 0 8px 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1rem;font-size:1.25rem;font-weight:600;color:var(--text-primary);line-height:1.4;flex-grow:1}.worksheet-meta{display:flex;align-items:center;gap:8px;color:var(--text-muted);font-size:.875rem;margin-bottom:1.5rem}.meta-icon{width:14px;height:14px;opacity:.7}.card-actions{display:flex;gap:1rem;margin-top:auto;border-top:1px solid var(--border-subtle);padding-top:1.25rem}.action-btn{flex:1;background:var(--bg-secondary);color:var(--text-primary);border:1px solid var(--border-subtle);padding:8px 12px;border-radius:6px;font-size:.875rem;font-weight:500;cursor:pointer;display:flex;align-items:center;justify-content:center;gap:6px;transition:all var(--duration-fast) var(--ease-out-expo)}.action-btn:hover{background:var(--bg-hover);border-color:var(--text-muted)}.danger-btn{background:transparent!important;color:#ef4444!important;border-color:#ef44444d!important}.danger-btn:hover{background:#ef44441a!important;border-color:#ef4444!important}.empty-state{grid-column:1 / 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1rem}.list-header{flex-direction:column;align-items:flex-start;gap:1rem}.primary-btn{width:100%;justify-content:center}.worksheet-grid{grid-template-columns:1fr}}.account-page{padding:32px;max-width:1100px;margin:0 auto;width:100%;overflow-y:auto;overflow-x:hidden;height:100%;box-sizing:border-box}.main-content.account-content{overflow-y:auto;overflow-x:hidden}.main-content.account-content>*{overflow:visible;max-height:none}.account-title{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin:0 0 24px}.account-loading{display:flex;flex-direction:column;align-items:center;justify-content:center;gap:12px;height:300px;color:var(--text-secondary)}.account-grid{display:grid;grid-template-columns:300px 1fr;gap:24px;align-items:start;max-width:100%}.account-info-card{background:var(--bg-elevated);border:1px solid var(--border-subtle);border-radius:16px;padding:28px 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#e74c3c)}.account-nickname-success{font-size:.8rem;color:var(--success-color, #27ae60)}.account-divider{width:100%;height:1px;background:var(--border-subtle);margin:8px 0}.account-balance-section{display:flex;flex-direction:column;align-items:center;gap:4px;padding:12px 0}.account-balance-label{font-size:.8rem;color:var(--text-secondary);text-transform:uppercase;letter-spacing:.5px}.account-balance-value{font-size:2.4rem;font-weight:700;color:var(--text-primary);line-height:1.1}.account-balance--warning{color:var(--color-warning)}.account-balance--danger{color:var(--color-error)}.account-subscription-section{width:100%;display:flex;flex-direction:column;gap:6px;padding:8px 0}.account-sub-row{display:flex;justify-content:space-between;align-items:center;font-size:.85rem}.account-sub-label{color:var(--text-secondary)}.account-sub-value{color:var(--text-primary);font-weight:500}.account-upgrade-btn{margin-top:8px;width:100%;padding:10px 0;border-radius:10px;border:none;background:linear-gradient(135deg,var(--accent-primary),var(--accent-secondary));color:#fff;font-size:.95rem;font-weight:600;cursor:pointer;transition:opacity .15s}.account-upgrade-btn:hover{opacity:.9}.account-transactions-card{background:var(--bg-elevated);border:1px solid var(--border-subtle);border-radius:16px;padding:24px;display:flex;flex-direction:column;gap:16px;min-height:400px}.account-transactions-title{font-size:1.1rem;font-weight:600;color:var(--text-primary);margin:0}.account-transactions-empty{color:var(--text-secondary);text-align:center;padding:40px 0;font-size:.9rem}.account-transactions-table-wrapper{overflow-x:auto}.account-transactions-table{width:100%;border-collapse:collapse;font-size:.85rem}.account-transactions-table th{text-align:left;padding:8px 12px;color:var(--text-secondary);font-weight:500;border-bottom:1px solid var(--border-subtle);white-space:nowrap}.account-transactions-table td{padding:10px 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var(--color-error-bg))}.tx-type--grant{color:var(--color-success);background:var(--color-success-bg)}.tx-type--purchase{color:var(--accent-primary);background:var(--accent-glow)}.tx-amount-negative{color:var(--color-error);font-weight:600;font-variant-numeric:tabular-nums}.tx-amount-positive{color:var(--color-success);font-weight:600;font-variant-numeric:tabular-nums}.tx-reason{max-width:280px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;color:var(--text-secondary);font-size:.8rem}.account-pagination{display:flex;align-items:center;justify-content:center;gap:16px;padding-top:8px}.account-page-btn{padding:6px 16px;border-radius:8px;border:1px solid var(--border-subtle);background:var(--bg-card);color:var(--text-secondary);font-size:.85rem;cursor:pointer;transition:background 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#0006}.feedback-floating-button:active{transform:scale(.95)}.feedback-overlay{position:fixed;inset:0;z-index:1000;display:flex;align-items:center;justify-content:center;background:#0009;-webkit-backdrop-filter:blur(4px);backdrop-filter:blur(4px)}.feedback-modal{background:var(--bg-elevated);border:1px solid var(--border-visible);border-radius:16px;padding:0;max-width:480px;width:90%;max-height:90vh;overflow:hidden;display:flex;flex-direction:column}.feedback-header{display:flex;align-items:center;justify-content:space-between;padding:20px 24px;border-bottom:1px solid var(--border-subtle)}.feedback-header h3{font-size:1.1rem;font-weight:600;color:var(--text-primary);margin:0}.feedback-close-button{background:none;border:none;font-size:1.8rem;line-height:1;color:var(--text-secondary);cursor:pointer;padding:0;width:32px;height:32px;display:flex;align-items:center;justify-content:center;border-radius:8px;transition:background .15s,color 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textarea{resize:vertical;min-height:120px}.feedback-message{padding:12px 16px;border-radius:8px;font-size:.9rem;margin-bottom:16px;text-align:center}.feedback-success{background:var(--color-success-bg);color:var(--color-success);border:1px solid rgba(34,197,94,.3)}.feedback-error{background:var(--color-error-bg);color:var(--color-error);border:1px solid rgba(239,68,68,.3)}.feedback-actions{display:flex;gap:12px;justify-content:flex-end}.feedback-btn-primary{padding:10px 24px;border-radius:8px;font-size:.9rem;font-weight:600;color:#fff;background:linear-gradient(135deg,var(--accent-primary),#4F46E5);border:none;cursor:pointer;transition:opacity .15s}.feedback-btn-primary:hover:not(:disabled){opacity:.9}.feedback-btn-primary:disabled{opacity:.6;cursor:not-allowed}.feedback-btn-secondary{padding:10px 24px;border-radius:8px;font-size:.9rem;font-weight:500;color:var(--text-secondary);background:var(--bg-card);border:1px solid var(--border-subtle);cursor:pointer;transition:background .15s}.feedback-btn-secondary:hover:not(:disabled){background:var(--bg-card-hover)}.feedback-btn-secondary:disabled{opacity:.6;cursor:not-allowed}@media(max-width:640px){.feedback-floating-button{bottom:16px;right:16px;width:48px;height:48px}.feedback-modal{max-width:95%}.feedback-header{padding:16px 20px}.feedback-form{padding:20px}.feedback-actions{flex-direction:column-reverse}.feedback-actions button{width:100%}}