: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%;--border-color: #444;--sidebar-bg: #2a2a2a;--chat-bg: #1e1e1e;--hover-bg: #3a3a3a;--sent-message-bg: #0b5394;--received-message-bg: #333;--text-light: rgba(255, 255, 255, .87);--text-muted: #aaa;--button-bg: #1a73e8;--button-hover-bg: #5b9cf0}a{font-weight:500;color:#646cff;text-decoration:inherit}a:hover{color:#535bf2}body{margin:0;display:flex;place-items:center;min-width:320px;min-height:100vh}#root{width:100%;height:100vh}h1{font-size:2em;line-height:1.1;margin-bottom:1rem;text-align:center;padding:.5rem 0}button{border-radius:8px;border:1px solid transparent;padding:.6em 1.2em;font-size:1em;font-weight:500;font-family:inherit;background-color:var(--button-bg);color:var(--text-light);cursor:pointer;transition:background-color .25s,border-color .25s}button:hover{background-color:var(--button-hover-bg)}button:focus,button:focus-visible{outline:4px auto -webkit-focus-ring-color}button:disabled{background-color:#555;cursor:not-allowed;opacity:.7}input[type=text],input[type=email],input[type=password]{padding:.6em 1em;border-radius:8px;border:1px solid var(--border-color);background-color:#333;color:var(--text-light);font-size:1em;margin-bottom:10px}ul{list-style:none;padding:0;margin:0}.App{display:flex;height:100vh;width:100%;overflow:hidden;background-color:var(--chat-bg)}.App-auth-container{width:100%;display:flex;justify-content:center;align-items:center;padding:20px}.sidebar{width:30%;min-width:250px;max-width:350px;border-right:1px solid var(--border-color);display:flex;flex-direction:column;background-color:var(--sidebar-bg)}.sidebar-header{padding:15px;border-bottom:1px solid var(--border-color);flex-shrink:0}.sidebar-header p{margin:0 0 10px}.sidebar-content{flex-grow:1;overflow-y:auto}.main-chat-area{flex-grow:1;display:flex;flex-direction:column;padding:0}.welcome-message{text-align:center;margin-top:50px;padding:20px;color:var(--text-muted)}.welcome-message h2{margin-bottom:10px}.auth-container{background-color:var(--sidebar-bg);padding:30px;border-radius:8px;border:1px solid var(--border-color);text-align:center}.auth-container h2{margin-top:0;margin-bottom:20px}.auth-container form div{margin-bottom:15px;text-align:left}.auth-container label{display:block;margin-bottom:5px;font-weight:700}.auth-container input{width:100%;box-sizing:border-box}.auth-container button[type=submit]{width:100%;margin-top:10px}.auth-container .toggle-button{margin-top:15px;background:none;border:none;color:var(--button-hover-bg);text-decoration:underline;cursor:pointer}.chat-list-container,.user-list-container{padding:10px}.chat-list-container h3,.user-list-container h4{margin-top:0;margin-bottom:10px;padding-bottom:10px;border-bottom:1px solid var(--border-color)}.chat-list-container ul li,.user-list-container ul li{padding:10px 15px;border-bottom:1px solid var(--border-color);cursor:pointer;transition:background-color .2s;display:flex;justify-content:space-between;align-items:center}.chat-list-container ul li:hover,.user-list-container ul li:hover{background-color:var(--hover-bg)}.chat-list-container ul li.selected,.user-list-container ul li.selected{background-color:var(--button-bg);font-weight:700}.user-list-container button{padding:.3em .8em;font-size:.9em}.chat-container{display:flex;flex-direction:column;height:100%;background-color:var(--chat-bg)}.chat-header{padding:10px 15px;border-bottom:1px solid var(--border-color);font-weight:700;flex-shrink:0}.message-list{flex-grow:1;overflow-y:auto;padding:15px;display:flex;flex-direction:column}.message{margin-bottom:10px;padding:8px 12px;border-radius:15px;max-width:70%;word-wrap:break-word}.message p{margin:0 0 3px}.message span.timestamp{font-size:.75em;color:var(--text-muted);display:block;text-align:right}.message.sent{background-color:var(--sent-message-bg);color:#fff;align-self:flex-end;border-bottom-right-radius:5px}.message.received{background-color:var(--received-message-bg);color:var(--text-light);align-self:flex-start;border-bottom-left-radius:5px}.message-input-form{display:flex;padding:15px;border-top:1px solid var(--border-color);background-color:var(--sidebar-bg);flex-shrink:0}.message-input-form input{flex-grow:1;margin-right:10px;margin-bottom:0}.loading-text,.error-text{text-align:center;padding:20px;color:var(--text-muted)}@media (prefers-color-scheme: light){:root{color:#213547;background-color:#fff;--border-color: #ccc;--sidebar-bg: #f0f0f0;--chat-bg: #ffffff;--hover-bg: #e0e0e0;--sent-message-bg: #d1e7fd;--received-message-bg: #e9e9eb;--text-light: #213547;--text-muted: #555;--button-bg: #1a73e8;--button-hover-bg: #4285f4}a:hover{color:#747bff}button{background-color:#f9f9f9;color:#213547}input[type=text],input[type=email],input[type=password]{background-color:#fff;color:#213547}.auth-container{background-color:#f9f9f9}.message.sent{color:#052c65}.message.received{color:#213547}.message-input-form{background-color:#f0f0f0}}