:root {
  --bg: #0e1116;
  --panel: #161b22;
  --panel-2: #1c2430;
  --border: #2a3340;
  --text: #e6edf3;
  --muted: #8b97a7;
  --accent: #58c4a3;
  --user: #2b4b7a;
  --code-bg: #0b0f14;
}
* { box-sizing: border-box; }
html, body { height: 100%; margin: 0; }
body {
  background: radial-gradient(1200px 600px at 50% -10%, #182030, var(--bg));
  color: var(--text);
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto,
        Helvetica, Arial, sans-serif;
}
#app {
  max-width: 820px; margin: 0 auto; height: 100vh;
  display: flex; flex-direction: column;
}
header {
  display: flex; align-items: center; justify-content: space-between;
  gap: 12px; padding: 16px 18px; border-bottom: 1px solid var(--border);
}
.brand { display: flex; align-items: center; gap: 12px; }
.dot {
  width: 12px; height: 12px; border-radius: 50%; background: var(--accent);
  box-shadow: 0 0 12px var(--accent); flex: none;
}
h1 { font-size: 16px; margin: 0; font-weight: 650; }
.ver { color: var(--accent); font-weight: 700; }
.tag { margin: 2px 0 0; color: var(--muted); font-size: 12px; max-width: 46ch; }
.controls { display: flex; align-items: center; gap: 12px; flex: none; }
.toggle { display: flex; align-items: center; gap: 5px; font-size: 12px;
  color: var(--muted); cursor: pointer; user-select: none; }
.toggle input { accent-color: var(--accent); }
button {
  background: var(--panel-2); color: var(--text); border: 1px solid var(--border);
  border-radius: 8px; padding: 7px 12px; cursor: pointer; font-size: 13px;
}
button:hover { border-color: var(--accent); }

main {
  flex: 1; overflow-y: auto; padding: 20px 18px; display: flex;
  flex-direction: column; gap: 14px;
}
.msg { display: flex; }
.msg.user { justify-content: flex-end; }
.bubble {
  max-width: 86%; padding: 11px 14px; border-radius: 14px;
  background: var(--panel); border: 1px solid var(--border);
}
.msg.user .bubble { background: var(--user); border-color: #34608f; }
.bubble p { margin: 0 0 8px; }
.bubble p:last-child { margin-bottom: 0; }
.bubble h1, .bubble h2, .bubble h3 { margin: 10px 0 6px; line-height: 1.3; }
.bubble h1 { font-size: 19px; } .bubble h2 { font-size: 16px; }
.bubble h3 { font-size: 14px; }
.bubble ul { margin: 6px 0; padding-left: 20px; }
.bubble li { margin: 2px 0; }
.bubble a { color: var(--accent); }
.bubble code {
  background: var(--code-bg); padding: 1px 5px; border-radius: 5px;
  font-family: "SF Mono", Consolas, monospace; font-size: 13px;
}
.bubble pre {
  background: var(--code-bg); border: 1px solid var(--border);
  border-radius: 9px; padding: 12px; overflow-x: auto; margin: 8px 0;
}
.bubble pre code { background: none; padding: 0; }
.meta { margin-top: 6px; font-size: 11px; color: var(--muted); }
.meta .route {
  background: var(--panel-2); border: 1px solid var(--border);
  border-radius: 5px; padding: 1px 6px; color: var(--accent);
}
.trace { margin-top: 4px; font-family: monospace; font-size: 10px;
  color: var(--muted); word-break: break-all; }

.suggestions { display: flex; flex-wrap: wrap; gap: 8px; }
.chip {
  background: var(--panel); border: 1px solid var(--border); color: var(--text);
  border-radius: 999px; padding: 6px 12px; font-size: 12px; cursor: pointer;
}
.chip:hover { border-color: var(--accent); color: var(--accent); }

.typing span {
  display: inline-block; width: 6px; height: 6px; margin: 0 1px;
  background: var(--muted); border-radius: 50%; animation: blink 1.2s infinite;
}
.typing span:nth-child(2) { animation-delay: .2s; }
.typing span:nth-child(3) { animation-delay: .4s; }
@keyframes blink { 0%,60%,100% { opacity: .25; } 30% { opacity: 1; } }

form#composer {
  display: flex; gap: 10px; padding: 14px 18px;
  border-top: 1px solid var(--border);
}
#input {
  flex: 1; background: var(--panel); border: 1px solid var(--border);
  color: var(--text); border-radius: 10px; padding: 12px 14px; font-size: 15px;
}
#input:focus { outline: none; border-color: var(--accent); }
#send { padding: 0 20px; background: var(--accent); color: #06231c;
  font-weight: 650; border: none; }

.about { flex: 1; overflow-y: auto; padding: 28px 22px 40px; }
.about h2 { font-size: 20px; margin: 28px 0 10px; }
.about h2:first-child { margin-top: 0; }
.about p { color: var(--text); margin: 0 0 12px; }
.about ul { margin: 0 0 12px; padding-left: 20px; }
.about li { margin: 4px 0; }
.about .lede { color: var(--muted); font-size: 14px; max-width: 60ch; }
.card-grid {
  display: grid; grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 12px; margin: 14px 0 4px;
}
.card {
  background: var(--panel); border: 1px solid var(--border);
  border-radius: 10px; padding: 14px 16px;
}
.card h3 { margin: 0 0 6px; font-size: 14px; color: var(--accent); }
.card p { margin: 0; font-size: 13px; color: var(--muted); }
.about a.back { color: var(--accent); font-size: 13px; text-decoration: none; }
.about a.back:hover { text-decoration: underline; }