:root{--bg:#fff;--muted:#666;--line:#e9e9e9;--bubble:#f7f7f7;--bubble-me:#f0f0f0;--accent:#111;--max-width:1100px;--sidebar-w:300px;--sidebar-w-collapsed:0;--gap:12px;--radius:8px;--nav-h:56px;--composer-h:64px}*{box-sizing:border-box}#__next,body,html{height:100%;margin:0;font-family:Inter,system-ui,Arial,sans-serif;background:#f6f6f6;color:var(--accent)}a{color:inherit;text-decoration:none}button{font-family:inherit}.container{max-width:var(--max-width);margin:0 auto;padding:0 12px}.app-root{display:flex;height:100vh;width:100%;min-width:320px}.sidebar{width:var(--sidebar-w);background:var(--bg);border-right:1px solid var(--line);display:flex;flex-direction:column;padding:12px;gap:10px;transition:transform .22s ease,width .22s ease}.sidebar .brand{font-weight:700;font-size:18px;color:var(--accent)}.sidebar .logged-as{font-size:13px;color:var(--muted);margin-top:4px}.search-bar{width:100%;padding:10px;border-radius:var(--radius);border:1px solid var(--line);background:#fafafa}.sidebar .scroll{overflow-y:auto;flex:1 1;padding-right:6px}.conv-item{display:flex;gap:10px;align-items:center;padding:8px;border-radius:8px;cursor:pointer}.conv-item.active{background:#fbfbfb}.conv-item:hover{background:#fafafa}.conv-item .avatar{width:40px;height:40px;border-radius:8px;background:#e9e9e9;display:flex;align-items:center;justify-content:center;font-weight:700;color:#444;flex-shrink:0}.main{flex:1 1;flex-direction:column;height:100%}.chat-header,.main{display:flex;background:var(--bg)}.chat-header{height:var(--nav-h);align-items:center;gap:12px;padding:0 14px;border-bottom:1px solid var(--line)}.chat-header .logged-user{display:flex;align-items:center;gap:8px;margin-left:auto}.messages{flex:1 1;overflow-y:auto;padding:16px;flex-direction:column;background:#fff}.messages,.msg-row{display:flex;gap:10px}.msg-row{align-items:flex-start;max-width:100%}.msg-row.mine{flex-direction:row-reverse}.msg-avatar{width:40px;height:40px;border-radius:8px;background:#e9e9e9;display:flex;align-items:center;justify-content:center;font-weight:700;color:#444;flex-shrink:0}.msg-body{max-width:75%;display:flex;flex-direction:column;gap:6px}.msg-author{font-weight:600;font-size:13px;color:var(--accent)}.msg-bubble{padding:10px 12px;border-radius:10px;background:var(--bubble);border:1px solid #eee;color:var(--accent);word-break:break-word}.msg-row.mine .msg-bubble{background:var(--bubble-me)}.composer{height:var(--composer-h);display:flex;gap:8px;align-items:center;padding:10px 14px;border-top:1px solid var(--line);background:var(--bg)}.composer input{flex:1 1;padding:10px;border-radius:8px;border:1px solid var(--line);background:#fff}.composer button{padding:10px 14px;border-radius:8px;background:var(--accent);color:#fff;border:none;cursor:pointer}.header-hamburger{display:none;border:0;background:transparent;font-size:20px;cursor:pointer}@media (max-width:860px){.app-root{flex-direction:column}.sidebar{position:fixed;top:0;left:0;height:100vh;z-index:80;width:var(--sidebar-w);transform:translateX(-100%);box-shadow:2px 0 12px rgba(0,0,0,.06)}.sidebar.open{transform:translateX(0)}.main{margin-left:0;width:100%;height:100vh}.chat-header{padding:0 10px}.header-hamburger{display:inline-block;margin-right:6px}.messages{padding:12px}.composer{position:fixed;bottom:0;left:0;right:0;z-index:10;box-shadow:0 -2px 6px rgba(0,0,0,.03)}.sidebar .scroll{-webkit-overflow-scrolling:touch}}@media (max-width:420px){:root{--sidebar-w:260px;--nav-h:52px;--composer-h:60px}.msg-body{max-width:86%}.conv-item .avatar,.msg-avatar{width:36px;height:36px}.composer input{padding:8px}}.form-card{width:100%;max-width:420px;margin:36px auto;background:#fff;padding:18px;border-radius:12px;box-shadow:0 4px 14px rgba(0,0,0,.04)}.form-row{display:flex;flex-direction:column;gap:10px}.form-row button,.form-row input{padding:10px;border-radius:8px;border:1px solid var(--line)}@media (max-width:860px){.form-card{margin:20px;padding:14px}}.muted{color:var(--muted);font-size:13px}.messages::-webkit-scrollbar,.sidebar .scroll::-webkit-scrollbar{width:8px}.messages::-webkit-scrollbar-thumb,.sidebar .scroll::-webkit-scrollbar-thumb{background:rgba(0,0,0,.08);border-radius:999px}.message,.msg-row{align-items:flex-start!important}.msg-avatar,.msg-avatar img,.msg-left .avatar{align-self:flex-start}.message-content,.msg-bubble{word-break:break-word;white-space:pre-wrap;display:inline-block;max-width:100%;box-sizing:border-box}@media (max-width:860px){.msg-body{max-width:86%!important}.message-content,.msg-bubble{max-width:86vw}:root{--composer-h:64px}.messages{padding-bottom:calc(var(--composer-h) + 20px)!important;-webkit-overflow-scrolling:touch}.messages>:last-child{margin-bottom:calc(var(--composer-h) + 6px)}}.message.me .message-content,.msg-row.mine .msg-bubble{align-self:flex-start}