:root {
  --bg: #1a1612;
  --surface: #221d18;
  --surface-2: #2c2620;
  --border: #3a3128;
  --text: #f4ede2;
  --text-muted: #b5a692;
  --amber: #f5a623;
  --amber-soft: #d99848;
  --orange: #e8743c;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: var(--bg); color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  font-size: 15px; line-height: 1.55;
}
.layout { display: grid; grid-template-columns: 260px 1fr 320px; height: 100vh; }
.sidebar {
  background: var(--surface); border-right: 1px solid var(--border);
  display: flex; flex-direction: column; padding: 16px;
}
.brand { display: flex; align-items: center; gap: 10px; margin-bottom: 24px; }
.brand-mark {
  width: 32px; height: 32px; border-radius: 8px;
  background: linear-gradient(135deg, var(--amber), var(--orange));
  display: grid; place-items: center; font-weight: 700; color: var(--bg);
}
.brand-name { font-weight: 600; font-size: 16px; letter-spacing: 0.4px; }
.new-chat {
  background: transparent; color: var(--text);
  border: 1px solid var(--border); border-radius: 8px;
  padding: 10px 12px; cursor: pointer; margin-bottom: 16px; text-align: left;
}
.new-chat:hover { border-color: var(--amber); }
.convo-list { flex: 1; overflow-y: auto; }
.convo-item {
  padding: 10px 12px; border-radius: 6px; cursor: pointer;
  color: var(--text-muted); font-size: 14px; margin-bottom: 4px;
  white-space: nowrap; overflow: hidden; text-overflow: ellipsis;
}
.convo-item:hover { background: var(--surface-2); color: var(--text); }
.convo-item.active { background: var(--surface-2); color: var(--amber); }
.convo-group { font-size: 11px; text-transform: uppercase; color: var(--text-muted); margin: 12px 0 4px; padding: 0 12px; letter-spacing: 0.6px; }
.user-card { border-top: 1px solid var(--border); padding-top: 12px; font-size: 13px; color: var(--text-muted); }
.user-card .name { color: var(--text); font-weight: 500; }
.user-card .role { color: var(--amber); font-size: 11px; text-transform: uppercase; letter-spacing: 0.5px; }
.chat { display: flex; flex-direction: column; min-width: 0; }
.chat-header { padding: 16px 24px; border-bottom: 1px solid var(--border); display: flex; align-items: center; gap: 12px; }
.chat-header h1 { margin: 0; font-size: 16px; font-weight: 500; }
.role-pill {
  background: var(--surface-2); color: var(--amber);
  padding: 2px 10px; border-radius: 999px; font-size: 11px;
  text-transform: uppercase; letter-spacing: 0.5px;
}
.messages { flex: 1; overflow-y: auto; padding: 24px; display: flex; flex-direction: column; gap: 16px; }
.msg { max-width: 800px; padding: 12px 16px; border-radius: 12px; line-height: 1.6; white-space: pre-wrap; word-wrap: break-word; }
.msg.user { align-self: flex-end; background: var(--surface-2); }
.msg.assistant { align-self: flex-start; background: var(--surface); border: 1px solid var(--border); }
.msg .cite-ref { color: var(--amber); cursor: pointer; text-decoration: underline; text-decoration-color: rgba(245,166,35,0.3); }
.tool-indicator {
  align-self: flex-start; color: var(--amber); font-size: 13px;
  display: flex; align-items: center; gap: 8px;
  padding: 8px 16px; background: var(--surface);
  border-radius: 12px; border: 1px solid var(--border);
}
.tool-indicator::before {
  content: ''; width: 8px; height: 8px; border-radius: 50%;
  background: var(--amber); animation: pulse 1.2s ease-in-out infinite;
}
@keyframes pulse { 0%, 100% { opacity: 0.3; transform: scale(0.8); } 50% { opacity: 1; transform: scale(1.2); } }
.composer { padding: 16px 24px; border-top: 1px solid var(--border); display: flex; gap: 12px; }
.composer textarea {
  flex: 1; background: var(--surface-2); color: var(--text);
  border: 1px solid var(--border); border-radius: 10px;
  padding: 12px 16px; font: inherit; resize: none; max-height: 160px;
}
.composer textarea:focus { outline: none; border-color: var(--amber); }
.composer button {
  background: linear-gradient(135deg, var(--amber), var(--orange));
  color: var(--bg); border: none; border-radius: 10px;
  padding: 0 22px; font-weight: 600; cursor: pointer;
}
.composer button:disabled { opacity: 0.5; cursor: not-allowed; }
.citations { background: var(--surface); border-left: 1px solid var(--border); padding: 16px; overflow-y: auto; }
.citations h2 { margin: 0 0 12px; font-size: 12px; text-transform: uppercase; color: var(--text-muted); letter-spacing: 0.6px; }
#cite-list { list-style: none; padding: 0; margin: 0; }
.cite { padding: 10px 12px; background: var(--surface-2); border: 1px solid var(--border); border-radius: 8px; margin-bottom: 8px; font-size: 13px; }
.cite .cite-num { color: var(--amber); font-weight: 600; margin-right: 6px; }
.cite .cite-title { color: var(--text); }
.empty { color: var(--text-muted); font-size: 13px; }
@media (max-width: 1000px) {
  .layout { grid-template-columns: 220px 1fr; }
  .citations { display: none; }
}