.header{position:fixed;top:0;left:0;right:0;height:var(--header-height);background:var(--bg-card);border-bottom:1px solid var(--border-dark);z-index:1000;-webkit-backdrop-filter:blur(10px);backdrop-filter:blur(10px)}.header-inner{max-width:1200px;height:100%;margin:0 auto;padding:0 20px;display:flex;align-items:center;justify-content:space-between}.logo{display:flex;align-items:center;text-decoration:none;gap:10px}.logo-icon{width:36px;height:36px;border-radius:var(--radius-md);object-fit:cover}.logo-text{color:var(--text-primary);font-size:20px;font-weight:700;letter-spacing:-.5px}.header-left{display:flex;align-items:center;gap:20px}.search-form{display:flex;align-items:center;position:relative}.search-input{width:220px;padding:10px 16px 10px 40px;font-size:14px;border:1px solid var(--border-medium);border-radius:var(--radius-full);background:var(--bg-input);color:var(--text-primary);transition:all .2s}.search-input::placeholder{color:var(--text-tertiary)}.search-input:focus{outline:none;width:280px;border-color:var(--primary-blue);box-shadow:0 0 0 3px #2563eb26}.search-btn{position:absolute;left:12px;background:none;border:none;font-size:14px;opacity:.5}.header-nav{display:flex;gap:4px}.nav-link{display:flex;align-items:center;gap:8px;padding:10px 16px;color:var(--text-secondary);font-size:14px;font-weight:500;text-decoration:none;border-radius:var(--radius-md);transition:all .15s}.nav-link:hover{background:var(--bg-card-hover);color:var(--text-primary)}.nav-link-profile{background:var(--bg-elevated);border:1px solid var(--border-dark)}.nav-link-profile .avatar{width:28px;height:28px;border:none}.nav-icon{width:18px;height:18px}.header-right{display:flex;align-items:center;gap:12px}.header-btn{padding:8px 16px;color:var(--text-link);font-size:14px;font-weight:500;text-decoration:none;border-radius:var(--radius-md);transition:all 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rgba(239,68,68,.3);border-radius:var(--radius-md);color:var(--error);font-size:14px;margin-bottom:16px}.form-group{margin-bottom:12px}.form-row{display:flex;gap:12px}.form-row .form-group{flex:1}.auth-submit{width:100%;padding:14px;font-size:16px;margin-top:8px}.auth-divider{display:flex;align-items:center;margin:24px 0;color:var(--text-tertiary);font-size:13px}.auth-divider:before,.auth-divider:after{content:"";flex:1;height:1px;background:var(--border-medium)}.auth-divider span{padding:0 16px}.auth-switch{width:100%;padding:14px;font-size:15px;text-decoration:none}.auth-footer-text{margin-top:24px;text-align:center;font-size:14px;color:var(--text-secondary)}.auth-footer-text a{color:var(--text-link);font-weight:500}@media (max-width: 900px){.auth-page{flex-direction:column}.auth-hero{padding:40px 20px}.auth-form-container{width:100%;border-left:none;border-top:1px solid var(--border-dark)}}.founding-invite-overlay{position:fixed;top:0;right:0;bottom:0;left:0;background:#000000b3;display:flex;align-items:center;justify-content:center;z-index:1000;padding:20px}.founding-invite-modal{background:var(--bg-card);border:1px solid var(--border-medium);border-radius:var(--radius-lg);padding:40px 32px;max-width:440px;width:100%;text-align:center}.founding-invite-icon{margin-bottom:16px}.founding-invite-modal h2{font-size:24px;font-weight:700;color:var(--text-primary);margin-bottom:12px}.founding-invite-text{font-size:15px;line-height:1.6;color:var(--text-secondary);margin-bottom:8px}.founding-invite-subtext{font-size:14px;color:var(--text-tertiary);margin-bottom:24px}.founding-invite-actions{display:flex;gap:12px;justify-content:center}.founding-invite-actions .btn{min-width:140px}.messages-page{display:flex;height:calc(100vh - var(--header-height) - 40px);background:var(--bg-card);border:1px solid 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.15s}.new-conversation-btn:hover{background:var(--primary-blue);border-color:var(--primary-blue)}.no-conversations{padding:20px;text-align:center;color:var(--text-tertiary)}.conversation-item{display:flex;align-items:center;gap:12px;padding:12px 16px;cursor:pointer;transition:background .15s}.conversation-item:hover{background:var(--bg-card-hover)}.conversation-item.active{background:var(--bg-elevated);border-left:3px solid var(--primary-blue)}.conversation-info{flex:1;min-width:0}.conversation-name{display:block;font-size:14px;font-weight:600;color:var(--text-primary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conversation-preview{display:block;font-size:13px;color:var(--text-tertiary);white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.conversation-time{font-size:11px;color:var(--text-tertiary)}.chat-area{flex:1;display:flex;flex-direction:column}.chat-header{display:flex;align-items:center;gap:12px;padding:16px 20px;border-bottom:1px solid var(--border-dark)}.chat-header-info h3{font-size:16px;font-weight:600;color:var(--text-primary)}.chat-status{font-size:12px;color:var(--success)}.messages-container{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:12px}.message{display:flex;align-items:flex-end;gap:8px;max-width:70%}.message.sent{align-self:flex-end;flex-direction:row-reverse}.message.received{align-self:flex-start}.message-bubble{padding:10px 16px;border-radius:var(--radius-lg);font-size:14px;line-height:1.4}.message.sent .message-bubble{background:linear-gradient(135deg,var(--primary-blue) 0%,var(--primary-blue-dark) 100%);color:#fff;border-bottom-right-radius:4px}.message.received .message-bubble{background:var(--bg-elevated);color:var(--text-primary);border-bottom-left-radius:4px}.message-bubble p{margin:0}.message-input-form{display:flex;align-items:center;gap:12px;padding:16px 20px;border-top:1px solid var(--border-dark)}.message-input{flex:1;padding:12px 20px;border:1px solid var(--border-medium);border-radius:var(--radius-full);background:var(--bg-input);color:var(--text-primary);font-size:14px;transition:all .15s}.message-input::placeholder{color:var(--text-tertiary)}.message-input:focus{outline:none;border-color:var(--primary-blue)}.send-button{width:44px;height:44px;display:flex;align-items:center;justify-content:center;background:var(--primary-blue);border:none;border-radius:var(--radius-full);color:#fff;font-size:18px;cursor:pointer;transition:all .15s}.send-button:hover:not(:disabled){background:var(--primary-blue-dark);transform:scale(1.05)}.send-button:disabled{opacity:.5;cursor:not-allowed}.no-chat-selected{flex:1;display:flex;flex-direction:column;align-items:center;justify-content:center;color:var(--text-secondary)}.no-chat-selected h3{font-size:18px;color:var(--text-primary);margin-bottom:8px}.no-chat-selected 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