:root {
  --bg: #0f172a;
  --card: #1e293b;
  --text: #e2e8f0;
  --muted: #94a3b8;
  --accent: #3b82f6;
}

* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: system-ui, sans-serif;
  background: var(--bg);
  color: var(--text);
  line-height: 1.5;
}
header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 1rem 2rem;
  border-bottom: 1px solid #334155;
}
main { max-width: 900px; margin: 0 auto; padding: 1.5rem; }
fieldset {
  border: 1px solid #334155;
  border-radius: 8px;
  margin-bottom: 1rem;
  padding: 1rem;
  background: var(--card);
}
label {
  display: block;
  margin-bottom: 0.75rem;
}
input, select, button {
  width: 100%;
  margin-top: 0.25rem;
  padding: 0.5rem;
  border-radius: 6px;
  border: 1px solid #475569;
  background: #0f172a;
  color: var(--text);
}
button {
  background: var(--accent);
  border: none;
  cursor: pointer;
  margin-top: 0.5rem;
}
button:hover { filter: brightness(1.1); }
.actions button { margin-right: 0.5rem; width: auto; display: inline-block; }
.log {
  background: #020617;
  padding: 1rem;
  border-radius: 8px;
  overflow: auto;
  font-size: 0.85rem;
}
.hidden { display: none !important; }
#preview-img { max-width: 100%; margin-top: 1rem; border-radius: 8px; }
#chat-messages {
  min-height: 200px;
  background: var(--card);
  padding: 1rem;
  border-radius: 8px;
  margin-bottom: 1rem;
}
.msg { margin-bottom: 0.75rem; }
.msg.user { color: #93c5fd; }
.msg.assistant { color: #a7f3d0; }
a { color: var(--accent); }