@import url('https://fonts.googleapis.com/css2?family=Inter:wght@400;500;600;700&display=swap');
:root {
  color-scheme: light;
  --bg: #0f172a;
  --panel: #111827;
  --panel-2: #0b1221;
  --border: rgba(148, 163, 184, 0.24);
  --text: #e5e7eb;
  --muted: #94a3b8;
  --primary: #8b5cf6;
  --primary-2: #7c3aed;
  --accent: #06b6d4;
}
* { box-sizing: border-box; }
body {
  margin: 0;
  font-family: 'Inter', system-ui, -apple-system, sans-serif;
  background: radial-gradient(circle at 20% 20%, rgba(124, 58, 237, 0.08) 0, transparent 30%),
              radial-gradient(circle at 80% 0%, rgba(6, 182, 212, 0.08) 0, transparent 28%),
              var(--bg);
  color: var(--text);
  min-height: 100vh;
}
header {
  padding: 16px 18px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  border-bottom: 1px solid var(--border);
  background: rgba(15, 23, 42, 0.7);
  backdrop-filter: blur(8px);
  position: sticky;
  top: 0;
  z-index: 5;
}
.logo { font-weight: 800; letter-spacing: 0.02em; }
.btn { display: inline-flex; align-items: center; gap: 8px; padding: 10px 14px; border-radius: 12px; border: 1px solid var(--border); background: #1f2937; color: var(--text); text-decoration: none; font-weight: 700; cursor: pointer; }
.btn.primary { border-color: transparent; background: linear-gradient(135deg, var(--primary), var(--primary-2)); color: #fff; box-shadow: 0 12px 30px rgba(139, 92, 246, 0.35); }
.layout { display: grid; grid-template-columns: 320px 1fr; gap: 14px; padding: 14px; }
.sidebar { background: var(--panel-2); border: 1px solid var(--border); border-radius: 14px; padding: 14px; display: flex; flex-direction: column; gap: 12px; }
.section-title { margin: 0; font-size: 14px; color: var(--muted); letter-spacing: 0.04em; text-transform: uppercase; }
.persona-list { display: grid; gap: 10px; }
.persona { border: 1px solid var(--border); border-radius: 12px; padding: 10px; cursor: pointer; background: #0f172a; transition: border-color 0.2s, box-shadow 0.2s; }
.persona:hover { border-color: var(--accent); box-shadow: 0 8px 24px rgba(6, 182, 212, 0.18); }
.persona.active { border-color: var(--primary); box-shadow: 0 8px 24px rgba(139, 92, 246, 0.3); }
.persona h3 { margin: 0 0 4px; font-size: 16px; }
.persona p { margin: 0; color: var(--muted); font-size: 14px; line-height: 1.5; }
.main { background: var(--panel); border: 1px solid var(--border); border-radius: 16px; display: flex; flex-direction: column; min-height: 70vh; }
.chat { flex: 1; padding: 14px; display: flex; flex-direction: column; gap: 10px; overflow-y: auto; }
.message { padding: 12px 14px; border-radius: 12px; max-width: 82ch; line-height: 1.6; }
.message.user { align-self: flex-end; background: rgba(6, 182, 212, 0.12); border: 1px solid rgba(6, 182, 212, 0.35); }
.message.ai { align-self: flex-start; background: rgba(139, 92, 246, 0.12); border: 1px solid rgba(139, 92, 246, 0.35); }
.composer { border-top: 1px solid var(--border); padding: 12px; display: grid; grid-template-columns: 1fr auto; gap: 10px; }
textarea { width: 100%; resize: vertical; min-height: 60px; max-height: 200px; padding: 10px; border-radius: 12px; border: 1px solid var(--border); background: #0b1221; color: var(--text); font-family: inherit; }
textarea:focus { outline: 2px solid var(--accent); }
.status { color: var(--muted); font-size: 13px; padding: 0 12px 12px; }
@media (max-width: 960px) {
  .layout { grid-template-columns: 1fr; }
}