.login-container{display:flex;justify-content:center;align-items:center;min-height:100vh;background-color:var(--primary-blue);padding:20px}.login-card{background-color:#fff;padding:2.5rem;border-radius:12px;box-shadow:0 4px 6px #0000001a;width:100%;max-width:400px}.login-card h2{text-align:center;color:var(--primary-blue);margin-bottom:2rem;font-size:24px;font-weight:500}.form-group{margin-bottom:1.25rem}.form-group input{width:100%;padding:12px 16px;border:1px solid #e4e6eb;border-radius:8px;font-size:16px;transition:border-color .2s ease}.form-group input:focus{outline:none;border-color:var(--primary-blue)}.login-card button{width:100%;padding:12px;background-color:var(--primary-blue);color:#fff;border:none;border-radius:8px;font-size:16px;cursor:pointer;margin-top:1.5rem;transition:background-color .2s ease}.login-card button:hover{background-color:var(--dark-blue)}.error-message{color:#e53935;text-align:center;margin-bottom:1rem;padding:12px;background-color:#e539351a;border-radius:8px}:root{--primary-blue: #4177F6;--message-blue: #0084ff;--message-gray: #e4e6eb}.app{height:100vh;display:flex}.sidebar{width:400px;background:var(--primary-blue);display:flex;flex-direction:column;padding:0;margin:0}.sidebar-header{padding:20px;display:flex;align-items:center;color:#fff;font-size:24px;font-weight:700}.sidebar-header .close-button{display:none}.search-container{padding:10px;width:80%;margin:8px}.search-container input{width:100%;padding:12px 20px;border-radius:20px;border:none;background:#fff3;color:#fff;font-size:16px}.search-container input::placeholder{color:#fffc}.chat-list{flex:1;overflow-y:auto;padding:10px}.chat-item{display:flex;align-items:center;padding:15px;cursor:pointer;background:#0000001a;margin:8px;border-radius:10px}.chat-item:hover{background:#0003}.user-info{margin-left:15px;color:#fff}.user-info h4{margin:0;font-size:16px}.user-info p{margin:5px 0 0;font-size:14px;opacity:.8}.chat-window{flex:1;display:flex;flex-direction:column;background:#fff}.messages{flex:1;padding:20px;overflow-y:auto;display:flex;flex-direction:column;gap:8px;background:#f0f2f5}.message{padding:12px 16px;position:relative;max-width:65%;word-wrap:break-word}.message.sent{background:var(--message-blue);color:#fff;margin-left:auto;border-radius:18px 18px 4px}.message.received{background:var(--message-gray);color:#000;margin-right:auto;border-radius:18px 18px 18px 4px}.message time{display:block;font-size:11px;margin-top:4px}.message.sent time{color:#ffffffb3}.message.received time{color:#00000080}.input-box{padding:20px;background:#fff;display:flex;align-items:center;gap:15px;border-top:1px solid #ddd}.input-box input{flex:1;padding:15px;border:none;border-radius:20px;background:#f0f2f5;font-size:15px}.input-box button{width:40px;height:40px;border-radius:50%;border:none;background:#000;color:#fff;display:flex;align-items:center;justify-content:center;cursor:pointer}@media (max-width: 768px){.sidebar{position:fixed;width:100%;height:100%;z-index:100;transform:translate(-100%);transition:transform .3s ease}.sidebar.open{transform:translate(0)}.chat-window{position:fixed;width:100%;height:100%}.back-button{display:flex;padding:10px;background:none;border:none;cursor:pointer}}.chat-header{padding:15px;background:#fff;border-bottom:1px solid #ddd;display:flex;align-items:center;gap:15px}.chat-header h3{margin:0;font-size:18px;font-weight:500}::-webkit-scrollbar{width:6px;height:6px}::-webkit-scrollbar-track{background:transparent}::-webkit-scrollbar-thumb{background:#0003;border-radius:3px}::-webkit-scrollbar-thumb:hover{background:#0000004d}.message{animation:messageAppear .3s ease}@keyframes messageAppear{0%{opacity:0;transform:translateY(10px)}to{opacity:1;transform:translateY(0)}}.no-chats{color:#fff;text-align:center;padding:20px;opacity:.7}.MuiAvatar-root{width:40px!important;height:40px!important}.highlighted-text{background-color:#ffffff4d;border-radius:3px}.header-buttons{display:flex;gap:10px;align-items:center}.new-chat-button{background:#fff3;border:none;color:#fff;width:32px;height:32px;border-radius:50%;display:flex;align-items:center;justify-content:center;font-size:24px;cursor:pointer;transition:background-color .2s;margin-left:20px}.new-chat-button:hover{background:#ffffff4d}.modal-overlay{position:fixed;top:0;left:0;right:0;bottom:0;background:#00000080;display:flex;justify-content:center;align-items:center;z-index:1000}.modal-content{background:#fff;border-radius:12px;width:90%;max-width:500px;max-height:80vh;display:flex;flex-direction:column}.modal-header{padding:20px;border-bottom:1px solid #eee;display:flex;justify-content:space-between;align-items:center}.modal-header h2{margin:0;font-size:20px;color:var(--text-primary)}.modal-header button{background:none;border:none;font-size:24px;cursor:pointer;color:var(--text-secondary)}.users-list{padding:20px;overflow-y:auto}.user-item{display:flex;align-items:center;padding:12px;border-radius:8px;cursor:pointer;transition:background-color .2s}.user-item:hover{background-color:var(--hover-blue)}.user-info{margin-left:12px}.user-info h4{margin:0;color:#3b3939}.chat-item{position:relative}.delete-chat-button{background:transparent;border:none;color:#ffffffb3;cursor:pointer;padding:8px;margin-left:auto;visibility:hidden}.chat-item:hover .delete-chat-button{visibility:visible}.delete-chat-button:hover{color:#fff}.chat-window:not(:has(.chat-header)){display:flex;justify-content:center;align-items:center;background-color:#f0f2f5;height:100%;font-size:1.5rem;color:#65676b;text-align:center;padding:20px;font-weight:500}.chat-window>div:only-child:not(.chat-header):not(.messages):not(.input-box){display:flex;justify-content:center;align-items:center;background-color:#f0f2f5;height:100%;font-size:1.5rem;color:#65676b;text-align:center;padding:20px;font-weight:500;font-family:-apple-system,BlinkMacSystemFont,Segoe UI,Roboto,Helvetica,Arial,sans-serif}.chat-window{display:flex;flex-direction:column;height:100%;flex:1}