:root{--bg:#f8fafc;--card:#ffffff;--accent:#0ea5a4;--muted:#6b7280}
body{font-family:Inter,ui-sans-serif,system-ui,Arial,sans-serif;background:var(--bg);color:#0f172a;margin:0}
.container{max-width:920px;margin:0 auto;padding:18px}
.topbar{background:#fff;border-bottom:1px solid #e6eef2;padding:12px}
h1{margin:0;font-size:20px}
.card{background:var(--card);padding:18px;border-radius:8px;box-shadow:0 1px 2px rgba(2,6,23,0.06);margin-top:18px}
.controls{margin-top:12px}
button{background:var(--accent);color:#fff;border:none;padding:8px 12px;border-radius:6px;cursor:pointer}
.hidden{display:none}
.chat-window{height:260px;overflow:auto;border:1px solid #eef2f7;padding:8px;border-radius:6px;background:#f9fafb}
.chat-input{display:flex;gap:8px;margin-top:8px}
input[type="text"], input[type="file"], #userInput{flex:1;padding:8px;border:1px solid #e6eef2;padding-left:10px;border-radius:6px}
.footer{margin-top:28px;padding:12px;text-align:center;color:var(--muted);font-size:13px}