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ease}.toolbar-btn:hover{background:var(--bg-elevated);color:var(--text-primary);border-color:var(--border-visible)}.toolbar-btn.active{background:var(--accent-primary);color:var(--bg-primary);border-color:var(--accent-primary)}.speed-slider{width:100px;height:6px;appearance:none;background:var(--bg-hover);border-radius:3px;cursor:pointer}.speed-slider::-webkit-slider-thumb{appearance:none;width:12px;height:12px;border-radius:50%;background:var(--accent-primary);cursor:pointer}.parameter-controls{display:flex;flex-wrap:wrap;gap:12px;padding:8px 12px;background:var(--bg-secondary);border-bottom:1px solid var(--border-subtle);flex-shrink:0}.param-slider{flex:1;min-width:200px}.param-slider label{display:flex;align-items:center;gap:12px}.param-name{font-family:var(--font-mono);font-size:.875rem;font-weight:600;color:var(--accent-primary);min-width:20px}.param-slider input[type=range]{flex:1;height:4px;appearance:none;background:var(--bg-hover);border-radius:2px;cursor:pointer}.param-slider 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#10b98180}.session-label{font-size:.8125rem;color:var(--text-muted);font-family:var(--font-mono)}.status-message{font-size:.8125rem;color:var(--accent-primary);padding:4px 12px;background:#06b6d41a;border-radius:var(--radius-sm)}.control-actions{display:flex;gap:10px}.control-btn{display:flex;align-items:center;gap:10px;padding:14px 28px;font-size:1rem;font-weight:500;border-radius:var(--radius-md);border:none;cursor:pointer;transition:all .2s ease}.control-btn.secondary{background:var(--bg-hover);color:var(--text-secondary);border:1px solid var(--border-subtle);box-shadow:none}.control-btn.secondary:hover:not(:disabled){background:var(--bg-elevated);color:var(--text-primary);border-color:var(--border-visible);transform:none}.control-btn.primary{background:linear-gradient(135deg,var(--accent-primary),#0891b2);color:var(--bg-primary);box-shadow:0 4px 12px var(--accent-glow)}.control-btn.primary:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 6px 16px var(--accent-glow)}.control-btn:disabled{opacity:.5;cursor:not-allowed}.auth-page{flex:1 1 0;min-height:0;display:flex;justify-content:center;align-items:flex-start;padding:40px 24px;background:linear-gradient(135deg,var(--bg-primary) 0%,var(--bg-secondary) 100%);overflow-y:auto;overflow-x:hidden}.auth-card{width:min(420px,100%);padding:40px;background:var(--bg-secondary);border:1px solid var(--border-subtle);border-radius:var(--radius-xl);box-shadow:var(--shadow-lg);margin-top:auto;margin-bottom:auto}.auth-header{text-align:center;margin-bottom:32px}.auth-logo{width:64px;height:64px;margin:0 auto 20px;border-radius:var(--radius-lg);background:linear-gradient(135deg,var(--accent-primary) 0%,var(--purple-primary) 100%);color:var(--bg-primary);font-family:serif;font-size:2rem;font-weight:700;display:flex;align-items:center;justify-content:center;box-shadow:0 8px 32px var(--accent-glow)}.auth-header h2{font-size:1.5rem;font-weight:600;color:var(--text-primary);margin:0 0 8px}.auth-header p{font-size:.875rem;color:var(--text-muted);margin:0}.auth-form{display:flex;flex-direction:column;gap:20px}.form-group{display:flex;flex-direction:column;gap:8px}.form-group label{font-size:.875rem;font-weight:500;color:var(--text-secondary)}.form-group input{padding:14px 16px;background:var(--bg-primary);border:1px solid var(--border-subtle);border-radius:var(--radius-md);color:var(--text-primary);font-size:.9375rem;transition:all .2s ease}.form-group input::placeholder{color:var(--text-muted)}.form-group input:focus{outline:none;border-color:var(--accent-primary);box-shadow:0 0 0 3px var(--accent-glow)}.auth-submit{padding:14px 24px;background:linear-gradient(135deg,var(--accent-primary),#0891b2);color:var(--bg-primary);border:none;border-radius:var(--radius-md);font-size:1rem;font-weight:600;cursor:pointer;transition:all .2s ease;box-shadow:0 4px 16px var(--accent-glow);margin-top:8px}.auth-submit:hover{transform:translateY(-2px);box-shadow:0 8px 24px var(--accent-glow)}.auth-error{padding:12px 16px;background:#f871711a;border:1px solid rgba(248,113,113,.2);border-radius:var(--radius-md);color:#f87171;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 a:hover{text-decoration:underline}.auth-card-register{width:min(480px,100%)}.form-group.has-error input{border-color:#f87171}.form-group.has-error input:focus{box-shadow:0 0 0 3px #f8717133}.form-group.has-success input{border-color:#10b981}.form-group.has-success input:focus{box-shadow:0 0 0 3px #10b98133}.field-error{font-size:.75rem;color:#f87171;display:flex;align-items:center;gap:4px}.field-error:before{content:"⚠";font-size:.7rem}.password-strength{margin-top:4px}.strength-indicators{display:flex;flex-wrap:wrap;gap:8px 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h2{font-size:4rem;font-weight:700;background:linear-gradient(135deg,var(--accent-primary),var(--purple-primary));-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text;margin:0 0 8px}.not-found p{font-size:1.125rem;color:var(--text-muted);margin:0 0 24px}.not-found a{color:var(--accent-primary);text-decoration:none;font-weight:500}.not-found a:hover{text-decoration:underline}.landing-page{flex:1;overflow-y:auto;overflow-x:hidden}.hero-section{min-height:calc(100vh - 80px);min-height:calc(100dvh - 80px);display:flex;align-items:center;justify-content:center;padding:80px 60px;background:radial-gradient(ellipse 80% 50% at 50% -20%,rgba(6,182,212,.15) 0%,transparent 50%),radial-gradient(ellipse 60% 40% at 90% 80%,rgba(168,85,247,.1) 0%,transparent 50%),var(--bg-primary)}.hero-inner{display:grid;grid-template-columns:1fr 1fr;gap:60px;align-items:center;max-width:1200px;width:100%}.hero-content{max-width:580px}.hero-badge{display:inline-flex;align-items:center;gap:8px;padding:8px 16px;background:#06b6d41a;border:1px solid rgba(6,182,212,.2);border-radius:100px;font-size:.875rem;color:var(--accent-primary);margin-bottom:24px}.badge-icon{font-size:1rem}.hero-title{font-size:3.5rem;font-weight:700;line-height:1.1;color:var(--text-primary);margin:0 0 24px}.gradient-text{display:block;background:linear-gradient(135deg,var(--accent-primary) 0%,var(--purple-primary) 100%);-webkit-background-clip:text;-webkit-text-fill-color:transparent;background-clip:text}.hero-description{font-size:1.125rem;line-height:1.7;color:var(--text-secondary);margin:0 0 36px}.hero-actions{display:flex;gap:16px}.btn-hero{display:inline-flex;align-items:center;gap:8px;padding:14px 28px;border-radius:var(--radius-md);font-size:1rem;font-weight:600;text-decoration:none;transition:all .2s ease}.btn-hero.primary{background:linear-gradient(135deg,var(--accent-primary) 0%,var(--purple-primary) 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-secondary);border:1px solid var(--border-visible);border-radius:16px;overflow:hidden;box-shadow:0 20px 60px #0006,0 0 0 1px #ffffff0d inset;transform:rotateY(-5deg) rotateX(5deg);transition:transform .3s ease}.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:#ff5f57}.card-dots span:nth-child(2){background:#febc2e}.card-dots span:last-child{background:#28c840}.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 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20px;border-radius:100px;font-weight:500;color:var(--text-secondary);background:var(--bg-primary);border:1px solid var(--border-subtle);cursor:default;transition:all .3s ease;white-space:nowrap}.tag-icon{font-size:1.1em}.cloud-tag:hover{color:var(--text-primary);border-color:var(--accent-primary);transform:translateY(-2px);box-shadow:0 4px 12px #06b6d426}.cloud-tag.size-sm{font-size:.8rem;padding:6px 14px}.cloud-tag.size-md{font-size:.95rem;padding:8px 18px}.cloud-tag.size-lg{font-size:1.1rem;padding:10px 22px;font-weight:600}.cloud-tag.accent{background:linear-gradient(135deg,#06b6d41a,#a855f71a);border-color:#06b6d44d;color:var(--accent-primary)}.cloud-tag.accent:hover{background:linear-gradient(135deg,#06b6d433,#a855f733);border-color:var(--accent-primary)}.cloud-tag.float-1{animation:float 4s ease-in-out infinite}.cloud-tag.float-2{animation:float 4.5s ease-in-out infinite .5s}.cloud-tag.float-3{animation:float 5s ease-in-out infinite 1s}.cloud-tag.float-4{animation:float 4.2s ease-in-out infinite 1.5s}.cloud-tag.float-5{animation:float 4.8s ease-in-out infinite 2s}@keyframes float{0%,to{transform:translateY(0)}50%{transform:translateY(-6px)}}.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(4,1fr);gap:24px;max-width:1200px;margin:0 auto}.feature-card{padding:32px;background:var(--bg-primary);border:1px solid var(--border-subtle);border-radius:16px;transition:all .3s ease}.feature-card:hover{border-color:var(--accent-primary);transform:translateY(-4px);box-shadow:0 20px 40px #0003}.feature-icon{font-size:2.5rem;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% 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auto;flex-wrap:wrap}.flow-step{display:flex;flex-direction:column;align-items:center;text-align:center;max-width:200px}.flow-number{width:48px;height:48px;border-radius:50%;background:linear-gradient(135deg,var(--accent-primary) 0%,var(--purple-primary) 100%);color:#fff;font-size:1.25rem;font-weight:700;display:flex;align-items:center;justify-content:center;margin-bottom:16px;box-shadow:0 4px 16px var(--accent-glow)}.flow-content h3{font-size:1rem;font-weight:600;color:var(--text-primary);margin:0 0 8px}.flow-content p{font-size:.875rem;color:var(--text-secondary);margin:0;line-height:1.5}.flow-arrow{color:var(--text-muted);flex-shrink:0}.topics-section{padding:100px 60px;background:var(--bg-secondary)}.topics-grid{display:grid;grid-template-columns:repeat(3,1fr);gap:24px;max-width:1000px;margin:0 auto}.topic-card{display:flex;align-items:flex-start;gap:16px;padding:24px;background:var(--bg-primary);border:1px solid var(--border-subtle);border-radius:12px;transition:all .2s 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span{font-weight:600;color:var(--text-primary)}.footer-copyright{font-size:.875rem;color:var(--text-muted);margin:0}@media(max-width:1200px){.features-grid,.features-grid-6,.topics-grid{grid-template-columns:repeat(2,1fr)}.steps-flow{gap:12px}.flow-step{max-width:160px}}@media(max-width:900px){.hero-section{padding:60px 24px}.hero-inner{grid-template-columns:1fr;text-align:center;gap:40px}.hero-content{max-width:100%}.hero-actions{justify-content:center}.hero-visual{display:flex;order:2}.visual-card{width:100%;max-width:400px}.hero-title{font-size:2.5rem}.features-section,.cta-section,.how-it-works-section,.topics-section{padding:60px 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.collapse-btn{display:none}.history-sidebar.collapsed .session-list{display:block}.history-sidebar.collapsed .new-session-btn span{display:inline}.main-area{width:100%}.main-content.two-column,.main-content.three-column{grid-template-columns:1fr;padding-bottom:calc(72px + var(--safe-area-inset-bottom, 0px))}.main-content.two-column .chat-panel,.main-content.three-column .chat-panel{display:none}.main-content.two-column .chat-panel.mobile-active,.main-content.three-column .chat-panel.mobile-active{display:flex}.main-content.two-column .steps-panel-section,.main-content.three-column .steps-panel-section{display:none;width:100%;min-width:100%;border-right:none}.main-content.two-column .steps-panel-section.mobile-active,.main-content.three-column .steps-panel-section.mobile-active{display:flex}.steps-panel-section.mobile-active .steps-list,.steps-panel-section.mobile-active .streaming-content{padding-bottom:calc(80px + var(--safe-area-inset-bottom, 0px))}.main-content.three-column 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