:root { --bg:#0e0f12; --panel:#15171c; --text:#eaeaf0; --muted:#a2a7b6; --accent:#7aa2ff; --ring:#2a2f3a; }
* { box-sizing: border-box; }
html,body { height: 100%; }
body {
  margin: 0; background: var(--bg); color: var(--text); font: 15px/1.4 system-ui, -apple-system, Segoe UI, Roboto, sans-serif;
}
.topbar {
  display: flex; align-items: center; justify-content: space-between;
  padding: 10px 14px; background: #0b0c10; border-bottom: 1px solid var(--ring); position: sticky; top: 0; z-index: 5;
}
.brand { font-weight: 700; }
.controls { display: flex; gap: 16px; align-items: center; font-size: 14px; color: var(--muted); }
.controls select, .controls input[type=range] {
  background: var(--panel); border: 1px solid var(--ring); color: var(--text); border-radius: 6px; padding: 4px 6px;
}

main { display: grid; grid-template-columns: 260px 1fr; min-height: calc(100vh - 48px); }
.sidebar {
  border-right: 1px solid var(--ring); padding: 12px; background: #0b0c10;
}
.sidebar h2 { font-size: 14px; color: var(--muted); margin: 0 0 10px; }
.preset {
  width: 100%; margin: 6px 0; padding: 8px; border-radius: 8px; border: 1px solid var(--ring);
  background: var(--panel); color: var(--text); text-align: left; cursor: pointer;
}
#system {
  width: 100%; min-height: 90px; margin-top: 8px; background: var(--panel); color: var(--text);
  border: 1px solid var(--ring); border-radius: 8px; padding: 8px;
}

.chat { display: flex; flex-direction: column; height: calc(100vh - 48px); }
#messages {
  flex: 1; overflow: auto; padding: 16px; display: flex; flex-direction: column; gap: 12px;
}
.msg {
  padding: 12px 14px; border: 1px solid var(--ring); border-radius: 10px; background: var(--panel); white-space: pre-wrap;
}
.msg.user { align-self: flex-end; background: #1f2430; }
.msg.assistant { align-self: flex-start; }
.msg small { display: block; color: var(--muted); margin-bottom: 6px; }

#chatForm { padding: 12px; border-top: 1px solid var(--ring); background: #0b0c10; }
#userInput {
  width: 100%; min-height: 80px; resize: vertical; background: var(--panel); color: var(--text);
  border: 1px solid var(--ring); border-radius: 10px; padding: 10px;
}
.row { margin-top: 8px; display: flex; gap: 8px; }
button {
  border: 1px solid var(--ring); background: var(--panel); color: var(--text); padding: 8px 12px; border-radius: 8px; cursor: pointer;
}
button:disabled { opacity: 0.6; cursor: not-allowed; }