:root{--bg-dark: #202225;--bg-sidebar: #2f3136;--bg-chat: #36393f;--bg-header: #2f3136;--text-main: #dcddde;--text-muted: #72767d;--accent: #5865f2;--accent-hover: #4752c4;--msg-me: #5865f2;--msg-other: #40444b}*{box-sizing:border-box;margin:0;padding:0;font-family:Segoe UI,Roboto,Helvetica,Arial,sans-serif}body,html,#root{height:100dvh;width:100%;overflow:hidden;background-color:var(--bg-dark)}.app-container{display:flex;height:100%;width:100%;background-color:var(--bg-chat);color:var(--text-main)}.sidebar{width:260px;background-color:var(--bg-sidebar);display:flex;flex-direction:column;border-right:1px solid #202225;flex-shrink:0}.sidebar-header{padding:15px;display:flex;justify-content:space-between;border-bottom:1px solid #202225}.sidebar-header h3{font-size:.9rem;color:var(--text-muted);text-transform:uppercase;letter-spacing:.5px}.sidebar-header span{display:none}.users-list{flex:1;overflow-y:auto;padding:10px}.user-card{display:flex;align-items:center;gap:12px;padding:8px;border-radius:4px;margin-bottom:2px;transition:background .2s}.user-card.current-user{background-color:#5865f21a}.user-avatar{width:32px;height:32px;border-radius:50%;background-color:var(--accent);display:flex;align-items:center;justify-content:center;font-weight:700;color:#fff;flex-shrink:0}.user-info{display:flex;flex-direction:column;overflow:hidden}.user-name{font-weight:500;white-space:nowrap;overflow:hidden;text-overflow:ellipsis}.user-status,.user-msgs{font-size:.7rem;color:var(--text-muted)}.chat-area{flex:1;display:flex;flex-direction:column;min-width:0}.chat-header{height:50px;padding:0 20px;display:flex;align-items:center;justify-content:space-between;background-color:var(--bg-chat);border-bottom:1px solid #202225}.messages-box{flex:1;overflow-y:auto;padding:20px;display:flex;flex-direction:column;gap:8px}.message{max-width:80%}.message.normal.me{align-self:flex-end}.message.normal.other{align-self:flex-start}.msg-sender-name{font-size:.75rem;margin-bottom:2px;color:#00aff4}.msg-bubble{padding:8px 12px;border-radius:16px;font-size:.95rem;word-wrap:break-word}.message.me .msg-bubble{background-color:var(--msg-me);color:#fff;border-bottom-right-radius:2px}.message.other .msg-bubble{background-color:var(--msg-other);border-bottom-left-radius:2px}.message.system{align-self:center;font-size:.75rem;color:var(--text-muted);margin:10px 0}.input-area{padding:15px 20px;display:flex;gap:10px;background-color:var(--bg-chat)}.input-area input{flex:1;background:#40444b;border:none;padding:10px 15px;border-radius:8px;color:#fff;outline:none}.input-area button{background:var(--accent);border:none;color:#fff;width:40px;height:40px;border-radius:50%;cursor:pointer}@media(max-width:768px){.app-container{flex-direction:column}.sidebar{width:100%;height:auto;border-right:none;border-bottom:1px solid #202225}.sidebar-header{padding:8px 15px}.sidebar-header span{display:block}.users-list{display:flex;flex-direction:row;overflow-x:auto;padding:0 7px;max-height:0px;gap:15px;scrollbar-width:none;transition:max-height .3s,padding .3s}.users-list.show-mobile{max-height:1000px;padding:7px}.users-list::-webkit-scrollbar{display:none}.user-card{flex-direction:column;min-width:60px;padding:3px;gap:4px;align-items:center;text-align:center}.user-avatar{width:40px;height:40px}.user-name{font-size:.7rem;max-width:60px}.user-status,.user-msgs{display:none}.chat-header{font-size:12px}.chat-area{height:0;flex:1}.messages-box{padding:10px}}