:root {
  --bg: #0c0d10;
  --bg-elev: #14161b;
  --bg-elev2: #1c1f26;
  --fg: #e9eef5;
  --fg-dim: #8e98a6;
  --accent: #6ea8ff;
  --accent-2: #a586ff;
  --border: rgba(255,255,255,0.08);
  --danger: #ff6b6b;
  --ok: #2dd4bf;
}
* { box-sizing: border-box; }
html, body { margin: 0; padding: 0; height: 100%; background: var(--bg); color: var(--fg);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif; }
a { color: var(--accent); text-decoration: none; }
a:hover { color: var(--accent-2); }
.topbar { display: flex; align-items: center; justify-content: space-between;
  padding: 14px 24px; border-bottom: 1px solid var(--border);
  background: rgba(12,13,16,0.85); backdrop-filter: blur(10px);
  position: sticky; top: 0; z-index: 10; }
.brand { font-weight: 700; font-size: 18px; letter-spacing: 0.5px; }
.nav { display: flex; gap: 18px; align-items: center; }
.nav .me { color: var(--fg-dim); font-size: 14px; }
main { padding: 24px; max-width: 980px; margin: 0 auto; }
.card { background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 12px; padding: 20px; }
.btn { display: inline-flex; align-items: center; gap: 6px; padding: 10px 18px;
  background: linear-gradient(135deg, var(--accent), var(--accent-2));
  border: none; border-radius: 8px; color: #0c0d10; font-weight: 600;
  cursor: pointer; transition: transform .1s; }
.btn:hover { transform: translateY(-1px); }
.btn.ghost { background: var(--bg-elev2); color: var(--fg); border: 1px solid var(--border); }
input, textarea { background: var(--bg-elev2); border: 1px solid var(--border);
  color: var(--fg); padding: 10px 14px; border-radius: 8px; font: inherit; width: 100%; }
input:focus, textarea:focus { outline: 2px solid var(--accent); border-color: transparent; }
.chat { display: flex; flex-direction: column; height: calc(100vh - 130px);
  background: var(--bg-elev); border: 1px solid var(--border);
  border-radius: 12px; overflow: hidden; }
.chat-log { flex: 1; overflow-y: auto; padding: 20px; display: flex;
  flex-direction: column; gap: 14px; }
.msg { max-width: 78%; padding: 12px 16px; border-radius: 12px; line-height: 1.5;
  white-space: pre-wrap; word-wrap: break-word; }
.msg.user { background: linear-gradient(135deg, var(--accent), var(--accent-2));
  color: #0c0d10; align-self: flex-end; border-bottom-right-radius: 4px; }
.msg.assistant { background: var(--bg-elev2); align-self: flex-start;
  border-bottom-left-radius: 4px; }
.msg.tool { background: rgba(110,168,255,0.08); color: var(--fg-dim);
  align-self: flex-start; font-size: 13px; padding: 8px 12px; }
.chat-input { display: flex; gap: 10px; padding: 14px; border-top: 1px solid var(--border);
  background: var(--bg-elev2); }
.hint { color: var(--fg-dim); font-size: 14px; margin-top: 6px; }
.kv { display: grid; grid-template-columns: 200px 1fr; gap: 8px 16px; }
.kv dt { color: var(--fg-dim); }
.ledger { font-family: ui-monospace, "JetBrains Mono", monospace; font-size: 13px; }
.ledger .pos { color: var(--ok); }
.ledger .neg { color: var(--danger); }
.empty { text-align: center; color: var(--fg-dim); padding: 60px 20px; }
.hero { padding: 80px 20px; text-align: center; }
.hero h1 { font-size: 48px; margin: 0 0 16px; background: linear-gradient(135deg, var(--accent), var(--accent-2));
  -webkit-background-clip: text; background-clip: text; color: transparent; }
.hero p { font-size: 18px; color: var(--fg-dim); max-width: 600px; margin: 0 auto 32px; }