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clamp(20px,5vw,80px);display:flex;position:fixed;top:0;left:0;right:0}.landing-nav-logo{letter-spacing:-.02em;font-size:1.35rem;font-weight:800}.landing-nav-links{align-items:center;gap:32px;display:flex}.landing-nav-link{color:var(--text-muted);transition:color var(--transition-fast);font-size:.875rem;font-weight:500}.landing-nav-link:hover{color:var(--text-primary)}.landing-nav-actions{align-items:center;gap:16px;display:flex}.landing-nav-login{color:var(--text-muted);transition:color var(--transition-fast);padding:8px 16px;font-size:.875rem;font-weight:500}.landing-nav-login:hover{color:var(--text-primary)}.landing-nav-signup{border-radius:var(--radius-full);padding:8px 20px;font-size:.875rem}.hero-section{align-items:center;min-height:100vh;padding:120px clamp(20px,5vw,80px) 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16px;display:flex}.topbar-left{align-items:center;gap:12px;display:flex}.topbar-logo{font-size:1.25rem;font-weight:700}.topbar-right{align-items:center;gap:16px;display:flex}.topbar-bell{padding:8px;position:relative}.topbar-user{align-items:center;gap:12px;display:flex}.topbar-username{color:var(--text-secondary);font-size:.875rem;font-weight:500}.topbar-logout:hover{color:var(--danger);background:#ef44441a}.avatar{color:#fff;border-radius:50%;flex-shrink:0;justify-content:center;align-items:center;font-weight:600;display:flex}.avatar-sm{width:32px;height:32px;font-size:.75rem}.avatar-md{width:40px;height:40px;font-size:.875rem}.avatar-lg{width:48px;height:48px;font-size:1rem}.avatar-gradient{background:var(--gradient-accent)}.avatar-muted{background:linear-gradient(135deg,#243054,#2e3d68)}.avatar-wrap{flex-shrink:0;position:relative}.new-sidebar-container{z-index:10;background:var(--bg-secondary);border-right:1px solid 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h3{color:#fff;margin-bottom:8px;font-size:1.25rem;font-weight:600}.chat-placeholder p{color:#64748b;text-align:center;max-width:280px;font-size:.875rem}.date-separator{align-items:center;gap:16px;margin:32px 0 24px;display:flex}.date-separator-line{background:#ffffff0d;flex:1;height:1px}.date-separator-text{color:#64748b;text-transform:uppercase;letter-spacing:.1em;white-space:nowrap;font-size:.7rem;font-weight:600}.message-row{gap:14px;margin-bottom:16px;display:flex}.message-row.sent{flex-direction:row-reverse}.message-avatar-col{flex-shrink:0;width:32px}.message-avatar{color:#fff;border-radius:50%;justify-content:center;align-items:center;width:32px;height:32px;font-size:.75rem;font-weight:600;display:flex}.message-content{flex-direction:column;max-width:75%;display:flex}.message-row.sent .message-content{align-items:flex-end}.message-sender-name{color:#64748b;margin-bottom:6px;padding:0 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(width>=1024px){.auth-branding{display:flex}.auth-form-section{width:50%;padding:48px}.auth-form-card{padding:40px}.auth-mobile-logo{display:none}.topbar{padding:0 24px}.chat-messages{padding:16px 32px}}@media (width<=1023px){.hero-chat-preview{display:none}.features-grid{grid-template-columns:1fr}.steps-grid{grid-template-columns:1fr;gap:32px}.testimonials-grid{grid-template-columns:1fr}.footer-top{grid-template-columns:1fr 1fr;gap:32px}.landing-nav-links{display:none}}@media (width<=767px){.topbar-username,.topbar-logo{display:none}.chat-messages{padding:12px}.message-content{max-width:85%}.footer-top{grid-template-columns:1fr}.footer-bottom{text-align:center;flex-direction:column;gap:12px}.hero-section{padding-top:100px}.layout-chat.hidden-on-mobile,.layout-sidebar.hidden-on-mobile{display:none!important}.layout-chat,.layout-sidebar{flex:1;width:100%;min-width:0}.new-sidebar-container{flex-direction:column-reverse;width:100%}.sidebar-nav-strip{border-top:1px solid #ffffff0d;border-right:none;flex-direction:row;width:100%;height:60px;padding:0 16px}.nav-strip-top{flex-direction:row;flex:1;justify-content:space-around;gap:0;height:100%}.nav-strip-bottom{flex-direction:row;justify-content:center;align-items:center;width:auto;height:100%;display:none}.nav-strip-btn{width:44px;height:44px}.nav-strip-label{display:none}.nav-account-avatar{margin-bottom:0}.mobile-back-btn{color:var(--text-secondary);cursor:pointer;background:0 0;border:none;justify-content:center;align-items:center;margin-right:8px;padding:4px;display:flex}}