.login-container{display:flex;align-items:center;justify-content:center;min-height:100vh;background:linear-gradient(135deg,#667eea,#764ba2);padding:20px}.login-card{background:#fff;border-radius:16px;padding:48px 40px;width:100%;max-width:400px;box-shadow:0 20px 60px #00000026;text-align:center}.login-logo{display:flex;flex-direction:column;align-items:center;gap:12px;margin-bottom:8px}.logo-icon{width:64px;height:64px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:16px;display:flex;align-items:center;justify-content:center;font-size:28px;font-weight:700}.login-logo h1{margin:0;font-size:28px;font-weight:700;color:#1a1a2e}.login-subtitle{color:#6b7280;margin:0 0 32px;font-size:15px}.input-group{margin-bottom:16px}.input-group input{width:100%;padding:14px 16px;border:2px solid #e5e7eb;border-radius:10px;font-size:16px;font-family:Inter,sans-serif;outline:none;transition:border-color .2s,box-shadow .2s;box-sizing:border-box}.input-group input:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea26}.input-group input::placeholder{color:#9ca3af}.error-text{color:#ef4444;font-size:13px;margin:-8px 0 16px;text-align:left}.login-button{width:100%;padding:14px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border:none;border-radius:10px;font-size:16px;font-weight:600;font-family:Inter,sans-serif;cursor:pointer;transition:opacity .2s,transform .1s}.login-button:hover{opacity:.9}.login-button:active{transform:scale(.98)}@media (max-width: 480px){.login-card{padding:36px 24px}.login-logo h1{font-size:24px}.logo-icon{width:56px;height:56px;font-size:24px}}.chat-header{display:flex;align-items:center;justify-content:space-between;padding:12px 20px;background:#fff;border-bottom:1px solid #e5e7eb;box-shadow:0 1px 3px #0000000d;position:sticky;top:0;z-index:100}.header-left{display:flex;align-items:center}.header-logo{display:flex;align-items:center;gap:10px}.header-logo-icon{width:36px;height:36px;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:8px;display:flex;align-items:center;justify-content:center;font-size:16px;font-weight:700}.header-title{font-size:18px;font-weight:700;color:#1a1a2e}.header-center{display:flex;align-items:center;gap:12px}.status-badge{display:flex;align-items:center;gap:6px;padding:4px 10px;background:#f3f4f6;border-radius:20px;font-size:12px;color:#6b7280}.status-dot{width:8px;height:8px;border-radius:50%}.online-badge{display:flex;align-items:center;gap:4px;padding:4px 10px;background:#ecfdf5;border-radius:20px;font-size:12px;color:#059669}.online-count{font-weight:700}.header-right{display:flex;align-items:center;gap:12px}.username-display{font-size:14px;font-weight:500;color:#374151}.logout-button{display:flex;align-items:center;justify-content:center;width:36px;height:36px;border:none;background:#f3f4f6;border-radius:8px;color:#6b7280;cursor:pointer;transition:background .2s,color .2s}.logout-button:hover{background:#fee2e2;color:#ef4444}@media (max-width: 640px){.chat-header{padding:10px 12px}.header-title{font-size:16px}.header-center{gap:6px}.status-badge,.online-badge{padding:3px 8px;font-size:11px}.username-display{font-size:12px}}.message-list{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:8px}.message-list::-webkit-scrollbar{width:6px}.message-list::-webkit-scrollbar-track{background:transparent}.message-list::-webkit-scrollbar-thumb{background:#d1d5db;border-radius:3px}.message-list-empty{flex:1;display:flex;align-items:center;justify-content:center;padding:20px}.empty-state{text-align:center;color:#9ca3af}.empty-icon{margin-bottom:16px}.loading-spinner{width:40px;height:40px;border:3px solid #e5e7eb;border-top-color:#667eea;border-radius:50%;animation:spin .8s linear infinite;margin:0 auto 16px}@keyframes spin{to{transform:rotate(360deg)}}.error-icon{width:48px;height:48px;background:#fef2f2;color:#ef4444;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:20px;font-weight:700;margin:0 auto 16px}.empty-title{font-size:16px;font-weight:600;color:#6b7280;margin:0 0 4px}.empty-subtitle{font-size:14px;color:#9ca3af;margin:0}.message-wrapper{display:flex;margin-bottom:4px}.message-wrapper.own{justify-content:flex-end}.message-wrapper.other{justify-content:flex-start}.message-bubble{max-width:70%;padding:10px 14px;border-radius:16px;position:relative;word-wrap:break-word}.message-wrapper.own .message-bubble{background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-bottom-right-radius:4px}.message-wrapper.other .message-bubble{background:#f3f4f6;color:#1a1a2e;border-bottom-left-radius:4px}.message-username{font-size:12px;font-weight:600;color:#667eea;margin-bottom:2px;display:block}.message-text{margin:0;font-size:14px;line-height:1.5}.message-time{font-size:11px;opacity:.7;margin-top:4px;display:block;text-align:right}@media (max-width: 640px){.message-list{padding:12px}.message-bubble{max-width:85%;padding:8px 12px}.message-text{font-size:13px}}.composer{display:flex;align-items:center;gap:10px;padding:16px 20px;background:#fff;border-top:1px solid #e5e7eb}.composer-input{flex:1;padding:12px 16px;border:2px solid #e5e7eb;border-radius:24px;font-size:15px;font-family:Inter,sans-serif;outline:none;transition:border-color .2s,box-shadow .2s}.composer-input:focus{border-color:#667eea;box-shadow:0 0 0 3px #667eea1a}.composer-input::placeholder{color:#9ca3af}.composer-input:disabled{background:#f9fafb;cursor:not-allowed}.composer-button{display:flex;align-items:center;justify-content:center;width:44px;height:44px;border:none;background:linear-gradient(135deg,#667eea,#764ba2);color:#fff;border-radius:50%;cursor:pointer;transition:opacity .2s,transform .1s;flex-shrink:0}.composer-button:hover:not(:disabled){opacity:.9}.composer-button:active:not(:disabled){transform:scale(.95)}.composer-button:disabled{opacity:.5;cursor:not-allowed}@media (max-width: 640px){.composer{padding:12px;gap:8px}.composer-input{padding:10px 14px;font-size:14px}.composer-button{width:40px;height:40px}}.typing-indicator{display:flex;align-items:center;gap:8px;padding:8px 20px;font-size:13px;color:#9ca3af;min-height:32px}.typing-dots{display:flex;gap:3px}.dot{width:6px;height:6px;background:#d1d5db;border-radius:50%;animation:bounce 1.4s ease-in-out infinite}.dot:nth-child(2){animation-delay:.2s}.dot:nth-child(3){animation-delay:.4s}@keyframes bounce{0%,80%,to{transform:translateY(0)}40%{transform:translateY(-6px)}}.typing-text{font-style:italic}@media (max-width: 640px){.typing-indicator{padding:6px 12px;font-size:12px}}.app{display:flex;flex-direction:column;height:100vh;max-width:100%;margin:0 auto;background:#f5f5f5;overflow:hidden}.chat-area{flex:1;display:flex;flex-direction:column;overflow:hidden}@media (min-width: 768px){.app{max-width:900px;margin:0 auto;border-left:1px solid #e5e7eb;border-right:1px solid #e5e7eb;background:#fff}}@media (min-width: 1024px){.app{max-width:1000px;margin:0 auto}}*,*:before,*:after{box-sizing:border-box;margin:0;padding:0}body{font-family:Inter,-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,sans-serif;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;background:#f5f5f5;color:#1a1a2e}#root{height:100vh}