*,body{margin:0}#chatSection h2,#loginForm #selectedRoomName{text-transform:capitalize}#chatBox,#userList{overflow-y:auto;background-color:#f9f9f9}.current-user,.private-messages div strong{font-weight:700}#chatSection h2,#loginForm,.chat-box,.container>p,.footer-copy,.text-center,h1{text-align:center}.dropdown{position:relative;display:inline-block}.dropbtn{background-color:#3498db;color:#fff;padding:6px 12px;font-size:14px;border:none;cursor:pointer;border-radius:4px}.dropdown-content{display:none;position:absolute;background-color:#fff;min-width:140px;box-shadow:0 4px 8px rgba(0,0,0,.15);border-radius:4px;z-index:1}.dropdown-content a{color:#333;padding:8px 12px;text-decoration:none;display:block;border-bottom:1px solid #eee;font-size:13px}.dropdown-content a:last-child{border-bottom:none}.dropdown-content a:hover{background-color:#f1f1f1}.dropdown:hover .dropdown-content{display:block}.dropdown:hover .dropbtn{background-color:#2980b9}:root{--primary-color:#1e88e5;--secondary-color:#f5f5f5;--text-color:#333;--border-radius:12px;--transition-speed:0.3s}*{box-sizing:border-box;padding:0;transition:all var(--transition-speed) ease-in-out}html{scroll-behavior:smooth}body{font-family:system-ui,sans-serif;color:var(--text-color)}a:focus-visible,button:focus-visible{outline:2px solid var(--primary-color);outline-offset:2px}.mt-1{margin-top:.5rem}.mt-2{margin-top:1rem}.mb-1{margin-bottom:.5rem}.mb-2{margin-bottom:1rem}.px-2{padding-left:1rem;padding-right:1rem}.flex-center{display:flex;justify-content:center;align-items:center}.grid-responsive{display:grid;grid-template-columns:repeat(auto-fit,minmax(250px,1fr));gap:20px}.btn,button{background-color:var(--primary-color);color:#fff;border:none;padding:12px 20px;border-radius:var(--border-radius);font-size:1rem;cursor:pointer;touch-action:manipulation}#chatSection,#loginForm,.chat-box{background:#fff;box-shadow:0 4px 8px rgba(0,0,0,.05)}.btn:hover,button:hover{background-color:darken(var(--primary-color),10%);transform:scale(1.02)}#previsualizar{width:100%;margin-right:0;magin-left:0px}.nav,header{display:flex}@media (prefers-color-scheme:dark){body{background-color:#121212;color:#fff}a{color:#90caf9}}body{font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",Roboto,Helvetica,Arial,sans-serif,"Apple Color Emoji","Segoe UI Emoji","Segoe UI Symbol";line-height:1.6;padding:0;background-color:#f8f8f8;color:#333}.container{max-width:1200px;margin:100px auto 15px;padding:20px 20px 10px}header{justify-content:space-between;align-items:center;padding:1em;background-color:#000;color:#fff;position:fixed;top:0;left:0;width:100%;z-index:1000}.logo{margin-right:1em}.nav{justify-content:flex-end;align-items:center}.nav-toggle{display:none}.nav-toggle-label{display:none;cursor:pointer}.nav-links{list-style:none;margin:0;padding:0;display:flex}#chatSection,.chat-input,footer{margin-top:20px}.nav-links li{margin-right:20px}.nav-links a{color:#fff;text-decoration:none}.nav-links a:hover{color:#ccc}h1{color:#000;margin-bottom:15px;font-size:2.5rem}.container>p{margin-top:0;margin-bottom:30px;color:#555;font-size:1.1rem}.hidden{display:none!important}.grid-container{display:grid;grid-template-columns:repeat(auto-fill,minmax(220px,1fr));gap:20px;padding:0;margin-bottom:40px}.chat-box{border-radius:10px;padding:1.5rem 1rem;transition:transform .2s ease-in-out,box-shadow .2s ease-in-out,border-color .2s ease-in-out;cursor:pointer;display:flex;flex-direction:column;align-items:center;justify-content:center;min-height:180px}.chat-box:hover{background:#e6e6e6;transform:translateY(-5px);box-shadow:0 8px 16px rgba(0,0,0,.1);border-color:#f37}.chat-box img.flag-icon{width:60px;height:auto;margin-bottom:12px;border:1px solid #eee;box-shadow:0 2px 5px rgba(0,0,0,.1);border-radius:3px}.chat-box h3{margin:.5rem 0 .3rem;font-size:1.3rem;color:#333}.chat-box p{margin:0;font-size:.95rem;color:#555}#loginForm{margin-top:40px;padding:30px 20px;border-radius:10px;border:1px solid #ddd;max-width:500px;margin-left:auto;margin-right:auto}#loginForm h2{color:#000;margin-bottom:20px;font-size:1.8rem}#loginForm button,.chat-input button{color:#fff;cursor:pointer;transition:background-color .2s,transform .1s}#chatSection h2,.private-messages div:last-child{margin-bottom:0}#loginForm input[type=text]{padding:12px;margin-right:10px;border:1px solid #ccc;border-radius:5px;font-size:1rem;width:calc(100% - 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