:root{color-scheme:dark;--bg:#212121;--panel:#171717;--panel2:#2f2f2f;--line:#3a3a3a;--text:#f4f4f4;--muted:#b4b4b4;--blue:#10a37f;--danger:#ff5c5c}*{box-sizing:border-box}html,body{height:100%}body{margin:0;font-family:Inter,ui-sans-serif,system-ui,-apple-system,Segoe UI,sans-serif;background:var(--bg);color:var(--text);font-size:16px}button,input,textarea{font:inherit}.auth-shell{min-height:100%;display:grid;place-items:center;padding:24px}.card{background:var(--panel);border:1px solid var(--line);border-radius:18px;padding:34px;box-shadow:0 20px 60px #0007;max-width:720px}.warn{border-color:#d29922}.login-card{text-align:center}.button,button{background:var(--text);color:#111;border:0;border-radius:999px;padding:12px 18px;text-decoration:none;font-weight:700;cursor:pointer}button:disabled{opacity:.55;cursor:wait}a{color:#cfcfcf}code{background:#0f0f0f;padding:3px 7px;border-radius:6px}.app-shell{height:100vh;display:grid;grid-template-columns:300px minmax(0,1fr);overflow:hidden}.sidebar{background:#171717;border-right:1px solid #282828;display:flex;flex-direction:column;padding:14px;gap:12px;min-width:0}.brand{display:flex;align-items:center;gap:10px;font-weight:800;padding:6px 4px 8px}.mark{width:30px;height:30px;border-radius:9px;background:var(--blue);display:grid;place-items:center;color:white}.new-chat{width:100%;background:#2b2b2b;color:var(--text);border:1px solid var(--line);border-radius:12px;text-align:left;padding:13px 14px}.new-chat:hover,.chat-item:hover,.icon-btn:hover{background:#333}.search-wrap input{width:100%;background:#111;border:1px solid #333;color:var(--text);border-radius:11px;padding:11px 12px;outline:none}.chat-list{flex:1;overflow:auto;display:flex;flex-direction:column;gap:4px;padding-right:2px}.chat-item{background:transparent;color:var(--text);border:0;border-radius:10px;padding:11px 10px;text-align:left;display:flex;flex-direction:column;gap:3px;min-width:0}.chat-item.active{background:#303030}.chat-title{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;font-size:14px}.chat-meta{font-size:12px;color:var(--muted)}.sidebar-footer{border-top:1px solid #2b2b2b;padding-top:12px;font-size:13px;color:var(--muted);display:flex;justify-content:space-between;gap:8px}.sidebar-footer div{overflow:hidden;text-overflow:ellipsis;white-space:nowrap}.chat-main{height:100vh;display:grid;grid-template-rows:auto minmax(0,1fr) auto auto;position:relative;background:var(--bg)}.topbar{height:58px;border-bottom:1px solid #2a2a2a;display:flex;align-items:center;justify-content:space-between;padding:0 18px;background:#212121cc;backdrop-filter:blur(12px);z-index:2}.topbar>div{display:flex;flex-direction:column;gap:2px;min-width:0}.topbar strong{overflow:hidden;text-overflow:ellipsis;white-space:nowrap;max-width:60vw}.topbar span{font-size:12px;color:var(--muted)}.icon-btn{background:transparent;color:var(--text);border:1px solid transparent;border-radius:10px;padding:9px 12px}.icon-btn.danger{color:#ff9a9a}.messages{overflow:auto;padding:26px max(22px,calc((100vw - 300px - 820px)/2)) 20px;display:flex;flex-direction:column;gap:24px}.msg{display:grid;grid-template-columns:42px minmax(0,1fr);gap:14px;line-height:1.6}.avatar{width:34px;height:34px;border-radius:50%;background:#444;color:#fff;display:grid;place-items:center;font-size:12px;font-weight:800;margin-top:2px}.msg.assistant .avatar{background:var(--blue)}.bubble{white-space:pre-wrap;overflow-wrap:anywhere;font-size:16px;max-width:820px}.msg.user .bubble{background:#2f2f2f;border-radius:18px;padding:13px 16px;justify-self:end;max-width:min(760px,88%)}.msg.user .avatar{order:2}.msg.user{grid-template-columns:minmax(0,1fr) 42px}.msg.error .bubble{background:#4a2323;border:1px solid #8c3b3b;border-radius:14px;padding:12px}.empty-state{position:absolute;inset:58px 0 110px;display:grid;place-items:center;text-align:center;pointer-events:none}.empty-state h1{font-size:34px;margin:0 0 8px}.empty-state p{margin:0;color:var(--muted)}.composer{margin:0 auto;width:min(860px,calc(100% - 32px));background:#2f2f2f;border:1px solid #454545;border-radius:26px;display:grid;grid-template-columns:auto minmax(0,1fr) auto;gap:8px;align-items:end;padding:10px 10px 10px 12px;box-shadow:0 12px 35px #0004}.composer textarea{background:transparent;color:var(--text);border:0;outline:none;resize:none;min-height:28px;max-height:220px;padding:10px 6px;line-height:1.45}.composer .icon-btn{border-radius:50%;width:42px;height:42px;padding:0;background:#3b3b3b}.composer button[type=submit]{height:42px;padding:0 18px;background:var(--text);color:#111}.hint{text-align:center;color:#888;font-size:12px;padding:9px 10px 14px}@media(max-width:800px){.app-shell{grid-template-columns:1fr}.sidebar{position:fixed;z-index:5;inset:0 auto 0 0;width:300px;transform:translateX(-103%);transition:.18s transform;box-shadow:20px 0 50px #0008}.sidebar-open .sidebar{transform:translateX(0)}.messages{padding:20px 16px}.topbar strong{max-width:48vw}.composer{width:calc(100% - 20px)}}@media(min-width:801px){#sidebarToggle{display:none}}