:root{--bg: #f3f7fc;--bg-2: #e6eefb;--panel: #ffffff;--ink: #172232;--muted: #607089;--line: #d8e2f1;--accent: #1f6feb;--accent-2: #22a699;--shadow-soft: 0 8px 26px rgba(16, 35, 74, .08);--shadow-hover: 0 12px 28px rgba(16, 35, 74, .16)}*{box-sizing:border-box}body{margin:0;font-family:Manrope,ui-sans-serif,-apple-system,BlinkMacSystemFont,Segoe UI,sans-serif;color:var(--ink);background:radial-gradient(circle at 0% 0%,#ffffff 0,transparent 34%),radial-gradient(circle at 100% 0%,#dde8ff 0,transparent 30%),linear-gradient(135deg,var(--bg),var(--bg-2));min-height:100vh}button,input,textarea,select{font:inherit}button,select,input,textarea,.chat-item,.msg{transition:transform .14s ease,box-shadow .18s ease,border-color .18s ease,background-color .18s ease,color .18s ease}button:focus-visible,select:focus-visible,input:focus-visible,textarea:focus-visible,.chat-item:focus-visible{outline:2px solid rgba(31,111,235,.35);outline-offset:2px}.loading{min-height:100vh;display:grid;place-items:center}.login-wrap{min-height:100vh;display:grid;place-items:center;padding:20px}.login-card{width:min(420px,100%);background:var(--panel);border:1px solid var(--line);border-radius:18px;box-shadow:var(--shadow-soft);padding:24px;display:grid;gap:12px}.login-card h1{margin:0;font-size:26px}.login-card p{margin:0 0 8px;color:var(--muted)}.login-card input,.login-card button{border:1px solid var(--line);border-radius:12px;padding:12px}.login-card button{background:linear-gradient(135deg,#2b77f0,#1f6feb);color:#fff;border:0;cursor:pointer;box-shadow:0 8px 18px #1f6feb47}.login-card button:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 12px 24px #1f6feb54}.error{color:#b00020}.app-shell{min-height:100vh;display:grid;grid-template-columns:320px 1fr}.sidebar{border-right:1px solid var(--line);background:#ffffffbd;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px);display:flex;flex-direction:column}.side-head{display:grid;gap:8px;padding:14px;border-bottom:1px solid var(--line)}.side-head button{border:0;border-radius:12px;padding:10px;background:linear-gradient(135deg,#2b77f0,#1f6feb);color:#fff;cursor:pointer;box-shadow:0 8px 16px #1f6feb38}.side-head select{border:1px solid var(--line);border-radius:12px;padding:10px;background:#fff}.side-head .secondary{background:linear-gradient(135deg,#58647c,#49566f)}.side-head button:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 14px 24px #10234a40}.chat-list{padding:10px;display:grid;gap:8px;overflow:auto}.chat-item{text-align:left;border:1px solid var(--line);background:#ffffffe6;border-radius:12px;padding:11px;cursor:pointer;box-shadow:0 2px 8px #10234a0a}.chat-item:hover{border-color:#9bb8ec;transform:translateY(-1px);box-shadow:0 10px 20px #10234a1a}.chat-item.active{border-color:var(--accent);background:linear-gradient(135deg,#edf4ff,#e8f0ff);box-shadow:0 8px 20px #1f6feb29}.main{display:grid;grid-template-rows:auto 1fr auto;min-height:100vh}.topbar{display:flex;justify-content:space-between;gap:10px;align-items:center;padding:14px 16px;border-bottom:1px solid var(--line);background:#ffffffd1;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.topbar select{border:1px solid var(--line);border-radius:12px;padding:9px 12px;background:#fff}.topbar select:hover{border-color:#9bb8ec}.chat-title{font-weight:650}.messages{overflow:auto;padding:16px;display:grid;gap:12px}.msg{border:1px solid var(--line);border-radius:14px;padding:12px 14px;background:#fff;box-shadow:0 4px 14px #10234a0d}.msg.user{background:linear-gradient(135deg,#ebf4ff,#f2f8ff);border-color:#b6d0f6}.msg.assistant{background:linear-gradient(135deg,#fff,#f7fbff)}.role{font-size:12px;color:var(--muted);margin-bottom:4px;text-transform:uppercase}.content{white-space:pre-wrap;word-break:break-word}.hint{color:var(--muted);margin-top:40px;text-align:center}.composer{border-top:1px solid var(--line);padding:12px;display:grid;grid-template-columns:1fr auto;gap:10px;background:#ffffffd9;-webkit-backdrop-filter:blur(8px);backdrop-filter:blur(8px)}.composer textarea{width:100%;resize:vertical;border:1px solid var(--line);border-radius:12px;padding:12px;background:#fff;min-height:88px}.composer textarea:hover{border-color:#9bb8ec}.composer button{align-self:end;border:0;border-radius:12px;background:linear-gradient(135deg,#25b6a7,var(--accent-2));color:#fff;padding:10px 16px;cursor:pointer;box-shadow:0 8px 16px #22a69942}.composer button:hover:not(:disabled){transform:translateY(-1px);box-shadow:0 14px 24px #22a69954}button:disabled{opacity:.6;cursor:not-allowed}@media(max-width:900px){.app-shell{grid-template-columns:1fr;grid-template-rows:250px 1fr}.sidebar{border-right:0;border-bottom:1px solid var(--line)}}