:root{--bg:#faf9f7;--surface:#fff;--surface-2:#f4f2ee;--border:#e9e6e0;--text:#1c1b1a;--text-2:#6b6862;--accent:#f2683f;--accent-soft:#fdeee8;--radius:16px;--sidebar-w:252px}*{box-sizing:border-box}body,html{padding:0;margin:0;height:100%}body{background:var(--bg);color:var(--text);font-family:ui-sans-serif,system-ui,-apple-system,Segoe UI,Roboto,Inter,sans-serif;-webkit-font-smoothing:antialiased}.app{display:flex;min-height:100vh}.sidebar{width:var(--sidebar-w);flex:0 0 var(--sidebar-w);border-right:1px solid var(--border);background:var(--surface);padding:18px 14px;display:flex;flex-direction:column;gap:6px;position:-webkit-sticky;position:sticky;top:0;height:100vh}.brand{display:flex;align-items:center;gap:10px;padding:6px 8px 16px}.brand-logo{width:30px;height:30px;border-radius:9px;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:700;font-size:15px}.brand-name{font-weight:650;font-size:15px}.nav-label{font-size:11px;text-transform:uppercase;letter-spacing:.06em;color:var(--text-2);padding:14px 10px 6px}.nav-item{display:flex;align-items:center;gap:11px;padding:9px 11px;border-radius:11px;color:var(--text-2);font-size:14px;cursor:pointer;text-decoration:none}.nav-item:hover{background:var(--surface-2);color:var(--text)}.nav-item.active{background:var(--accent-soft);color:var(--accent);font-weight:600}.nav-item .ic{width:17px;text-align:center;opacity:.9}.sidebar-bottom{margin-top:auto}.main{flex:1 1;display:flex;flex-direction:column;min-width:0}.topbar{display:flex;align-items:center;justify-content:space-between;padding:22px 32px 6px}.topbar h1{font-size:26px;margin:0;font-weight:680}.pill{border:1px solid var(--border);background:var(--surface);padding:8px 14px;border-radius:999px;font-size:13px;color:var(--text-2)}.chat-wrap{max-width:860px;width:100%;margin:0 auto;padding:12px 24px 24px;min-height:0}.chat-wrap,.thread{flex:1 1;display:flex;flex-direction:column}.thread{overflow-y:auto;padding:18px 4px;gap:18px}.empty{margin:auto;text-align:center;color:var(--text-2);max-width:440px}.empty .ava{width:64px;height:64px;border-radius:50%;background:var(--accent);color:#fff;display:grid;place-items:center;font-size:26px;margin:0 auto 14px}.empty h2{color:var(--text);font-size:20px;margin:0 0 6px}.suggestions{display:flex;flex-wrap:wrap;gap:8px;justify-content:center;margin-top:18px}.chip{border:1px solid var(--border);background:var(--surface);border-radius:999px;padding:8px 14px;font-size:13px;cursor:pointer;color:var(--text)}.chip:hover{border-color:var(--accent);color:var(--accent)}.msg{display:flex;gap:12px}.msg .ava{width:32px;height:32px;border-radius:50%;flex:0 0 32px;display:grid;place-items:center;font-size:14px;color:#fff}.msg.user{flex-direction:row-reverse}.msg.user .ava{background:#3a3a3a}.msg.bot .ava{background:var(--accent)}.bubble{padding:12px 15px;border-radius:14px;font-size:14.5px;line-height:1.55;white-space:pre-wrap;max-width:78%}.msg.user .bubble{background:#2a2a2a;color:#fff;border-bottom-right-radius:5px}.msg.bot .bubble{background:var(--surface);border:1px solid var(--border);border-bottom-left-radius:5px}.typing{color:var(--text-2);font-style:italic}.composer{border:1px solid var(--border);background:var(--surface);border-radius:var(--radius);padding:10px 12px;display:flex;align-items:flex-end;gap:10px;box-shadow:0 1px 2px rgba(0,0,0,.03)}.composer textarea{flex:1 1;border:none;outline:none;resize:none;font:inherit;font-size:15px;background:transparent;color:var(--text);max-height:160px;padding:6px 4px}.send{background:var(--accent);color:#fff;border:none;width:38px;height:38px;border-radius:11px;cursor:pointer;font-size:17px;flex:0 0 38px}.send:disabled{opacity:.45;cursor:not-allowed}.hint{text-align:center;color:var(--text-2);font-size:12px;margin-top:8px}.login-wrap{min-height:100vh;display:grid;place-items:center;padding:24px}.login-card{width:100%;max-width:380px;background:var(--surface);border:1px solid var(--border);border-radius:var(--radius);padding:32px 28px;display:flex;flex-direction:column;gap:14px;text-align:center;box-shadow:0 8px 30px rgba(0,0,0,.06)}.login-logo{width:48px;height:48px;border-radius:13px;background:var(--accent);color:#fff;display:grid;place-items:center;font-weight:700;font-size:22px;margin:0 auto}.login-card h1{margin:6px 0 0;font-size:22px}.login-card p{margin:0 0 6px;color:var(--text-2);font-size:14px}.login-card input{border:1px solid var(--border);border-radius:11px;padding:12px 14px;font-size:15px;outline:none}.login-card input:focus{border-color:var(--accent)}.login-card button{background:var(--accent);color:#fff;border:none;border-radius:11px;padding:12px;font-size:15px;font-weight:600;cursor:pointer}.login-card button:disabled{opacity:.5;cursor:not-allowed}.login-error{color:#c0392b;font-size:13px}.login-switch{font-size:13px;color:var(--text-2);margin-top:4px}.login-switch button{background:none;border:none;color:var(--accent);font:inherit;font-weight:600;cursor:pointer;padding:0}