:root{--primary: #6366f1;--primary-hover: #4f46e5;--primary-light: #e0e7ff;--bg: #f8fafc;--bg-secondary: #ffffff;--bg-tertiary: #f1f5f9;--text: #0f172a;--text-secondary: #64748b;--text-muted: #94a3b8;--border: #e2e8f0;--border-light: #f1f5f9;--success: #22c55e;--error: #ef4444;--warning: #f59e0b;--shadow: 0 1px 3px 0 rgb(0 0 0 / .1), 0 1px 2px -1px rgb(0 0 0 / .1);--shadow-lg: 0 10px 15px -3px rgb(0 0 0 / .1), 0 4px 6px -4px rgb(0 0 0 / .1);--radius: 8px;--radius-lg: 12px;--radius-full: 9999px}*{margin:0;padding:0;box-sizing:border-box}html,body,#root{height:100%;width:100%}body{font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica Neue,Arial,sans-serif;background:var(--bg);color:var(--text);line-height:1.5;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale}.loading-screen{display:flex;flex-direction:column;align-items:center;justify-content:center;height:100vh;gap:16px}.spinner{width:40px;height:40px;border:3px solid var(--border);border-top-color:var(--primary);border-radius:50%;animation:spin .8s linear infinite}.spinner.small{width:24px;height:24px;border-width:2px}.spinner.tiny{width:16px;height:16px;border-width:2px}@keyframes spin{to{transform:rotate(360deg)}}.auth-page{min-height:100vh;display:flex;align-items:center;justify-content:center;padding:20px;background:linear-gradient(135deg,#667eea,#764ba2)}.auth-card{width:100%;max-width:400px;background:var(--bg-secondary);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);padding:40px}.auth-header{text-align:center;margin-bottom:32px}.auth-logo{margin-bottom:16px}.auth-header h1{font-size:24px;font-weight:600;margin-bottom:8px}.auth-header p{color:var(--text-secondary);font-size:14px}.auth-form{display:flex;flex-direction:column;gap:20px}.auth-error{background:#fef2f2;border:1px solid #fecaca;color:#dc2626;padding:12px;border-radius:var(--radius);font-size:14px;text-align:center}.form-group{display:flex;flex-direction:column;gap:6px}.form-group label{font-size:14px;font-weight:500;color:var(--text)}.form-group input{padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;transition:border-color .2s,box-shadow .2s}.form-group input:focus{outline:none;border-color:var(--primary);box-shadow:0 0 0 3px var(--primary-light)}.form-group input:disabled{background:var(--bg-tertiary);cursor:not-allowed}.field-hint{font-size:12px;color:var(--text-muted)}.auth-button{padding:12px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;transition:background .2s}.auth-button:hover:not(:disabled){background:var(--primary-hover)}.auth-button:disabled{opacity:.7;cursor:not-allowed}.auth-footer{text-align:center;margin-top:24px;font-size:14px;color:var(--text-secondary)}.auth-footer a{color:var(--primary);text-decoration:none;font-weight:500}.auth-footer a:hover{text-decoration:underline}.chat-list-page{height:100vh;display:flex;flex-direction:column;background:var(--bg)}.chat-list-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--bg-secondary);border-bottom:1px solid var(--border)}.chat-list-header h1{font-size:20px;font-weight:600}.header-actions{display:flex;gap:8px}.icon-button{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius);cursor:pointer;color:var(--text-secondary);transition:background .2s,color .2s}.icon-button:hover{background:var(--bg-tertiary);color:var(--text)}.search-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;align-items:flex-start;justify-content:center;z-index:100;padding:60px 20px 20px}.search-container{width:100%;max-width:480px;background:var(--bg-secondary);border-radius:var(--radius-lg);box-shadow:var(--shadow-lg);overflow:hidden}.search-input-wrapper{display:flex;align-items:center;padding:12px 16px;border-bottom:1px solid var(--border)}.search-input-wrapper input{flex:1;border:none;font-size:16px;background:transparent;outline:none}.close-search{width:32px;height:32px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius);cursor:pointer;color:var(--text-secondary)}.close-search:hover{background:var(--bg-tertiary)}.search-results{max-height:400px;overflow-y:auto}.search-loading,.search-empty{padding:24px;text-align:center;color:var(--text-muted)}.search-result-item{width:100%;display:flex;align-items:center;gap:12px;padding:12px 16px;background:transparent;border:none;cursor:pointer;text-align:left;transition:background .2s}.search-result-item:hover{background:var(--bg-tertiary)}.conversation-list{flex:1;overflow-y:auto}.conversation-item{width:100%;display:flex;align-items:center;gap:12px;padding:16px 20px;background:transparent;border:none;border-bottom:1px solid var(--border-light);cursor:pointer;text-align:left;transition:background .2s}.conversation-item:hover{background:var(--bg-tertiary)}.conversation-info{flex:1;min-width:0}.conversation-top{display:flex;justify-content:space-between;align-items:center;margin-bottom:4px}.conversation-name{font-weight:500;font-size:15px}.conversation-time{font-size:12px;color:var(--text-muted);white-space:nowrap}.conversation-bottom{display:flex;align-items:center}.conversation-preview{font-size:13px;color:var(--text-secondary);overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:100%}.conversation-preview.no-messages{font-style:italic}.file-indicator{color:var(--primary)}.user-avatar{width:48px;height:48px;border-radius:var(--radius-full);background:var(--primary-light);display:flex;align-items:center;justify-content:center;flex-shrink:0;overflow:hidden}.user-avatar.small{width:40px;height:40px}.user-avatar.large{width:96px;height:96px;font-size:36px}.user-avatar img{width:100%;height:100%;object-fit:cover}.user-avatar span{font-size:18px;font-weight:600;color:var(--primary)}.user-avatar.large span{font-size:36px}.user-info{min-width:0}.user-name{font-weight:500;font-size:15px}.user-username{font-size:13px;color:var(--text-muted)}.empty-state{display:flex;flex-direction:column;align-items:center;justify-content:center;padding:60px 20px;text-align:center;color:var(--text-muted)}.empty-state svg{margin-bottom:16px;opacity:.5}.empty-state h2{font-size:18px;font-weight:500;color:var(--text);margin-bottom:8px}.empty-state p{font-size:14px;margin-bottom:20px}.primary-button{padding:10px 20px;background:var(--primary);color:#fff;border:none;border-radius:var(--radius);font-size:14px;font-weight:500;cursor:pointer;transition:background .2s}.primary-button:hover{background:var(--primary-hover)}.chat-page{height:100vh;display:flex;flex-direction:column;background:var(--bg)}.chat-header{display:flex;align-items:center;gap:12px;padding:12px 16px;background:var(--bg-secondary);border-bottom:1px solid var(--border)}.back-button{width:36px;height:36px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius);cursor:pointer;color:var(--text-secondary);transition:background .2s}.back-button:hover{background:var(--bg-tertiary)}.chat-header-info{flex:1;display:flex;align-items:center;gap:12px;min-width:0}.chat-header-info h2{font-size:16px;font-weight:600}.chat-header-info .username{font-size:12px;color:var(--text-muted)}.connection-status{font-size:12px}.status-online{color:var(--success)}.status-offline{color:var(--text-muted)}.messages-container{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:4px}.loading-more{display:flex;justify-content:center;padding:16px}.load-more-button{padding:8px 16px;background:transparent;border:1px solid var(--border);border-radius:var(--radius);color:var(--text-secondary);font-size:13px;cursor:pointer;margin:8px auto}.load-more-button:hover{background:var(--bg-tertiary)}.empty-messages{flex:1;display:flex;align-items:center;justify-content:center;color:var(--text-muted);font-size:14px}.message-bubble-wrapper{display:flex;gap:8px;max-width:70%}.message-bubble-wrapper.own{align-self:flex-end;flex-direction:row-reverse}.message-bubble-wrapper.other{align-self:flex-start}.message-avatar{width:32px;height:32px;border-radius:var(--radius-full);background:var(--primary-light);display:flex;align-items:center;justify-content:center;flex-shrink:0;color:var(--primary);font-size:10px}.message-bubble{padding:10px 14px;border-radius:var(--radius-lg);max-width:100%;word-wrap:break-word}.message-bubble.own{background:var(--primary);color:#fff;border-bottom-right-radius:4px}.message-bubble.other{background:var(--bg-secondary);border:1px solid var(--border);border-bottom-left-radius:4px}.message-bubble.first.own{border-top-right-radius:var(--radius-lg)}.message-bubble.first.other{border-top-left-radius:var(--radius-lg)}.message-text{font-size:14px;line-height:1.5;white-space:pre-wrap}.message-meta{display:flex;align-items:center;gap:4px;margin-top:4px;font-size:11px;opacity:.7}.message-time,.message-status{color:inherit}.message-status.read{color:#93c5fd}.message-file{min-width:200px}.file-preview{margin-bottom:8px;border-radius:var(--radius);overflow:hidden}.file-preview.image img{width:100%;max-height:300px;object-fit:cover;display:block}.file-preview.video video{width:100%;max-height:300px;display:block}.file-preview.document{display:flex;align-items:center;justify-content:center;padding:24px;background:var(--bg-tertiary)}.file-info{display:flex;flex-direction:column;gap:2px}.file-name{font-size:13px;font-weight:500}.file-size{font-size:11px;opacity:.7}.typing-indicator{display:flex;align-items:center;gap:4px;padding:8px 16px;align-self:flex-start}.typing-indicator .dot{width:8px;height:8px;background:var(--text-muted);border-radius:var(--radius-full);animation:typing 1.4s infinite}.typing-indicator .dot:nth-child(2){animation-delay:.2s}.typing-indicator .dot:nth-child(3){animation-delay:.4s}@keyframes typing{0%,60%,to{transform:translateY(0);opacity:.4}30%{transform:translateY(-4px);opacity:1}}.message-input-container{padding:12px 16px;background:var(--bg-secondary);border-top:1px solid var(--border)}.pending-file{display:flex;align-items:center;justify-content:space-between;padding:8px 12px;background:var(--bg-tertiary);border-radius:var(--radius);margin-bottom:8px;font-size:13px}.pending-file button{background:transparent;border:none;font-size:18px;cursor:pointer;color:var(--text-muted)}.message-input-wrapper{display:flex;align-items:flex-end;gap:8px}.file-upload-button{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:transparent;border:none;border-radius:var(--radius);cursor:pointer;color:var(--text-secondary);transition:background .2s;flex-shrink:0}.file-upload-button:hover{background:var(--bg-tertiary);color:var(--text)}.message-input-wrapper textarea{flex:1;padding:10px 14px;border:1px solid var(--border);border-radius:var(--radius);font-size:14px;font-family:inherit;resize:none;max-height:120px;line-height:1.5}.message-input-wrapper textarea:focus{outline:none;border-color:var(--primary)}.send-button{width:40px;height:40px;display:flex;align-items:center;justify-content:center;background:var(--primary);border:none;border-radius:var(--radius-full);cursor:pointer;color:#fff;transition:background .2s;flex-shrink:0}.send-button:hover:not(:disabled){background:var(--primary-hover)}.send-button:disabled{opacity:.5;cursor:not-allowed}.profile-page{height:100vh;display:flex;flex-direction:column;background:var(--bg)}.profile-header{display:flex;align-items:center;justify-content:space-between;padding:16px 20px;background:var(--bg-secondary);border-bottom:1px solid var(--border)}.profile-header h1{font-size:18px;font-weight:600}.profile-content{flex:1;overflow-y:auto;padding:24px;display:flex;flex-direction:column;align-items:center;gap:24px}.avatar-section{display:flex;flex-direction:column;align-items:center;gap:8px}.avatar-section h2{font-size:20px;font-weight:600}.avatar-section .username{font-size:14px;color:var(--text-muted)}.profile-form{width:100%;max-width:400px;display:flex;flex-direction:column;gap:20px}.profile-message{padding:12px;border-radius:var(--radius);font-size:14px;text-align:center}.profile-message.success{background:#dcfce7;border:1px solid #bbf7d0;color:#166534}.profile-message.error{background:#fef2f2;border:1px solid #fecaca;color:#dc2626}.disabled-input{background:var(--bg-tertiary)!important;cursor:not-allowed!important}.logout-button{display:flex;align-items:center;justify-content:center;gap:8px;width:100%;max-width:400px;padding:12px;background:transparent;border:1px solid var(--error);border-radius:var(--radius);color:var(--error);font-size:14px;font-weight:500;cursor:pointer;transition:background .2s}.logout-button:hover{background:#fef2f2}@media (max-width: 640px){.auth-card{padding:24px}.message-bubble-wrapper{max-width:85%}.chat-header-info h2{font-size:15px}}