:root {
  --bg: #ffffff;
  --card: #ffffff;
  --card-2: #f7f7f7;
  --border: #dddddd;
  --text: #222222;
  --muted: #717171;
  --accent: #ff385c;
  --user: #2b2620;
}

* { box-sizing: border-box; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--text);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, system-ui, sans-serif;
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
  height: 100vh;
  display: flex;
  flex-direction: column;
}

.topbar {
  display: flex; justify-content: space-between; align-items: flex-start; gap: 16px;
  max-width: 1120px; width: 100%; margin: 0 auto; padding: 22px 20px 10px;
}
.topbar h1 { font-size: 1.5rem; margin: 0; font-weight: 600; letter-spacing: -0.02em; }
.tagline { color: var(--muted); margin: 4px 0 0; font-size: 0.9rem; }
.back { color: #222222; text-decoration: none; font-size: 0.85rem; white-space: nowrap; opacity: 0.85; }
.back:hover { opacity: 1; }

.chat-wrap { flex: 1; display: flex; flex-direction: column; max-width: 1120px; width: 100%; margin: 0 auto; padding: 0 16px 16px; min-height: 0; }

.messages { flex: 1; overflow-y: auto; padding: 10px 4px; display: flex; flex-direction: column; gap: 14px; }
.msg { display: flex; }
.msg.user { justify-content: flex-end; }
.bubble {
  max-width: 86%; padding: 12px 16px; border-radius: 16px; font-size: 0.96rem;
  border: 1px solid var(--border);
}
.msg.agent .bubble { background: var(--card); border-top-left-radius: 4px; }
.msg.user .bubble { background: var(--user); border-top-right-radius: 4px; }
.bubble p { margin: 0 0 10px; }
.bubble p:last-child { margin-bottom: 0; }
.bubble h3 { font-size: 1.02rem; margin: 12px 0 6px; }
.bubble h4 { font-size: 0.95rem; margin: 10px 0 5px; color: var(--accent); }
.bubble ul, .bubble ol { margin: 6px 0 10px; padding-left: 22px; }
.bubble li { margin-bottom: 3px; }
.bubble code { background: rgba(0,0,0,0.35); padding: 1px 5px; border-radius: 5px; font-size: 0.9em; }
.bubble pre { background: #f7f7f7; border: 1px solid var(--border); border-radius: 10px; padding: 12px; overflow-x: auto; }
.bubble pre code { background: none; padding: 0; }
.bubble table { border-collapse: collapse; margin: 8px 0; font-size: 0.9rem; width: 100%; }
.bubble th, .bubble td { border: 1px solid var(--border); padding: 6px 10px; text-align: left; }
.bubble th { background: var(--card-2); }
.bubble.thinking { color: var(--muted); font-style: italic; }

.quick { display: flex; flex-wrap: wrap; gap: 8px; padding: 10px 4px; }
.chip {
  border: 1px solid var(--border); background: var(--card); color: var(--muted);
  border-radius: 999px; padding: 8px 14px; font: inherit; font-size: 0.85rem; cursor: pointer;
}
.chip:hover { color: var(--text); border-color: var(--accent); }

.composer { display: flex; gap: 10px; align-items: flex-end; background: var(--card); border: 1px solid var(--border); border-radius: 16px; padding: 8px 8px 8px 14px; }
.composer textarea {
  flex: 1; background: none; border: none; color: var(--text); font: inherit; font-size: 0.98rem;
  resize: none; max-height: 160px; padding: 6px 0; outline: none;
}
.send {
  flex: none; width: 40px; height: 40px; border-radius: 12px; border: none; cursor: pointer;
  background: var(--accent); color: #ffffff; font-size: 1.1rem;
}
.send:hover { filter: brightness(1.08); }
.send:disabled { opacity: 0.5; cursor: default; }
.skills-used { margin-top: 10px; padding-top: 8px; border-top: 1px solid var(--border); color: var(--accent); font-size: 0.76rem; }
.composer-note { color: var(--muted); font-size: 0.76rem; text-align: center; margin-top: 8px; }
.composer-note a { color: var(--muted); }