*{box-sizing:border-box}
:root{
  --bg:#0f1724;
  --card:#0b1220;
  --accent:#7c3aed;
  --muted:#9aa4b2;
  --msg-user:#1f2937;
  --msg-bot:#0b1220;
}
html,body,#chatWindow{height:100%}
body{
  margin:0;
  font-family:Inter, system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial;
  background: linear-gradient(180deg,#071025 0%, #0f1724 100%);
  color: white;
  -webkit-font-smoothing:antialiased;
  -moz-osx-font-smoothing:grayscale;
  display:flex;
  align-items:center;
  justify-content:center;
  padding:24px;
}
.app{
  width:100%;
  max-width:800px;
  background:linear-gradient(180deg, rgba(255,255,255,0.02), rgba(255,255,255,0.01));
  border-radius:14px;
  box-shadow: 0 8px 30px rgba(2,6,23,0.6);
  padding:18px;
  display:flex;
  flex-direction:column;
  gap:12px;
  min-height:640px;
}
header h1{margin:0;font-size:1.6rem;letter-spacing:0.2px}
.tag{margin:0;color:var(--muted);font-size:0.9rem}
.chat-window{
  background:linear-gradient(180deg, rgba(255,255,255,0.01), rgba(255,255,255,0.00));
  border-radius:10px;
  padding:14px;
  flex:1;
  display:flex;
  flex-direction:column;
  gap:8px;
  overflow:auto;
  border:1px solid rgba(255,255,255,0.02);
}
.messages{display:flex;flex-direction:column;gap:10px}
.msg{max-width:78%;padding:10px 12px;border-radius:12px;line-height:1.35}
.msg.user{align-self:flex-end;background:linear-gradient(180deg,#111827,#0b1220);border:1px solid rgba(255,255,255,0.02)}
.msg.bot{align-self:flex-start;background:linear-gradient(180deg, #061223, #0b1220);border:1px solid rgba(124,58,237,0.12)}
.meta{font-size:0.72rem;color:var(--muted);margin-bottom:6px}
.composer{display:flex;gap:8px}
.composer input{flex:1;padding:12px;border-radius:10px;border:1px solid rgba(255,255,255,0.03);background:transparent;color:white;outline:none}
.composer button{padding:10px 12px;border-radius:10px;border:none;background:var(--accent);color:white;font-weight:600;cursor:pointer}
.composer #voiceBtn{background:transparent;border:1px solid rgba(255,255,255,0.04);font-size:1.1rem}
.typing{font-style:italic;color:var(--muted)}
footer small{color:var(--muted)}
`