:root{font-family:Inter,system-ui,Avenir,Helvetica,Arial,sans-serif;line-height:1.5;font-weight:400;color-scheme:light dark;color:#ffffffde;background-color:#242424;font-synthesis:none;text-rendering:optimizeLegibility;-webkit-font-smoothing:antialiased;-moz-osx-font-smoothing:grayscale;-webkit-text-size-adjust:100%}*{margin:0;padding:0;box-sizing:border-box}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}#root{width:100%;height:100vh}.chat-container{display:flex;height:100vh;width:100%}.sidebar{width:300px;background-color:#1a1a1a;border-right:1px solid #333;overflow-y:auto}.main-chat{flex:1;display:flex;flex-direction:column;background-color:#242424}.message-list{flex:1;overflow-y:auto;padding:20px}.message-input{padding:20px;border-top:1px solid #333}.message{margin-bottom:15px;padding:10px;border-radius:8px;background-color:#333}.message.own{background-color:#4a9eff;margin-left:0%;width:50%;border-radius:20px 0}.message.other{background-color:#444;margin-left:60%;width:40%}.message-header{font-size:12px;color:#888;margin-bottom:5px}.message-content{font-size:14px;line-height:1.4}.conversation-item{padding:15px;border-bottom:1px solid #333;cursor:pointer;transition:background-color .2s}.conversation-item:hover{background-color:#2a2a2a}.conversation-item.active{background-color:#4a9eff}.login-form,.register-form{max-width:400px;margin:50px auto;padding:30px;background-color:#333;border-radius:8px;box-shadow:0 4px 6px #0000001a}.form-group{margin-bottom:20px}.form-group label{display:block;margin-bottom:5px;font-weight:500}.form-group input{width:100%;padding:10px;border:1px solid #555;border-radius:4px;background-color:#444;color:#fff;font-size:14px}.form-group input:focus{outline:none;border-color:#4a9eff}.btn{width:100%;padding:12px;background-color:#4a9eff;color:#fff;border:none;border-radius:4px;font-size:16px;cursor:pointer;transition:background-color .2s}.btn:hover{background-color:#3a8eef}.btn:disabled{background-color:#666;cursor:not-allowed}.error{color:#ff6b6b;font-size:14px;margin-top:5px}.success{color:#51cf66;font-size:14px;margin-top:5px}.nav-link{color:#4a9eff;text-decoration:none}.nav-link:hover{text-decoration:underline}.auth-container{display:flex;justify-content:center;align-items:center;min-height:100vh;background-color:#242424}.create-conversation-form{padding:20px;border-bottom:1px solid #333}.user-checkbox{margin-right:10px}.user-list{max-height:200px;overflow-y:auto;margin-bottom:15px}.user-item{padding:5px;border-bottom:1px solid #444}.timestamp{font-size:11px;color:#888;margin-left:10px}