:root {
  --bg: #0e1118;
  --panel: #161b25;
  --ink: #e5e9f0;
  --muted: #8b94a7;
  --line: #232a37;
  --accent: #7c83ff;
  --accent-soft: #1a1f2e;
  --r: 14px;
  --shadow: 0 1px 2px rgba(0,0,0,.3), 0 8px 28px rgba(0,0,0,.25);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
html, body { height: 100%; }
body {
  font: 15px/1.55 -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  background: var(--bg); color: var(--ink);
  -webkit-font-smoothing: antialiased;
}
.app { max-width: 880px; margin: 0 auto; min-height: 100%; display: flex; flex-direction: column; padding: 0 18px; }

header.bar {
  display: flex; align-items: center; gap: 14px;
  padding: 22px 4px 18px; border-bottom: 1px solid var(--line);
}
.logo {
  width: 44px; height: 44px; border-radius: 12px; flex: none;
  background: var(--accent); color: #0e1118;
  display: grid; place-items: center; font-size: 22px;
}
.bar h1 { font-size: 18px; font-weight: 650; letter-spacing: -.01em; }
.bar p { font-size: 13px; color: var(--muted); }
.bar p code { background: var(--accent-soft); padding: 1px 6px; border-radius: 5px; color: var(--accent); font-size: 12px; }
.bar nav { margin-left: auto; display: flex; gap: 8px; }
.bar nav a {
  font-size: 13px; text-decoration: none; color: var(--muted);
  padding: 7px 13px; border-radius: 999px; border: 1px solid var(--line);
}
.bar nav a:hover { color: var(--accent); border-color: var(--accent); }

.meta {
  display: flex; gap: 14px; flex-wrap: wrap;
  padding: 12px 0;
  color: var(--muted); font-size: 12.5px;
}
.meta .pill {
  background: var(--accent-soft); color: var(--accent);
  padding: 4px 10px; border-radius: 999px; font-weight: 600;
}

.chat { flex: 1; display: flex; flex-direction: column; padding: 8px 0 20px; gap: 14px; }
.log { flex: 1; display: flex; flex-direction: column; gap: 14px; overflow-y: auto; padding: 4px; min-height: 50vh; }
.msg { max-width: 80%; padding: 12px 16px; border-radius: var(--r); white-space: pre-wrap; line-height: 1.55; }
.msg.bot { background: var(--panel); border: 1px solid var(--line); align-self: flex-start; box-shadow: var(--shadow); border-bottom-left-radius: 4px; }
.msg.me { background: var(--accent); color: #0e1118; align-self: flex-end; border-bottom-right-radius: 4px; font-weight: 500; }
.msg.sys { align-self: center; color: var(--muted); font-size: 13px; background: none; }
.typing { color: var(--muted); font-size: 13px; align-self: flex-start; padding: 6px 4px; }
.sources {
  display: flex; flex-wrap: wrap; gap: 6px; margin-top: 8px; padding-top: 8px;
  border-top: 1px solid var(--line);
}
.sources .src {
  background: var(--accent-soft); color: var(--accent);
  font-size: 11.5px; font-weight: 600;
  padding: 3px 8px; border-radius: 6px;
}

.hints { display: flex; flex-wrap: wrap; gap: 8px; }
.hints button {
  font: inherit; font-size: 13px; cursor: pointer; color: var(--muted);
  background: var(--panel); border: 1px solid var(--line);
  padding: 8px 14px; border-radius: 999px;
}
.hints button:hover { color: var(--accent); border-color: var(--accent); }

.composer { display: flex; gap: 10px; padding: 4px 0 24px; }
.composer input {
  flex: 1; font: inherit; padding: 14px 16px; border-radius: var(--r);
  border: 1px solid var(--line); background: var(--panel); color: var(--ink);
}
.composer input:focus { outline: 2px solid var(--accent); border-color: transparent; }
button.send {
  font: inherit; font-weight: 600; cursor: pointer; color: #0e1118;
  background: var(--accent); border: 0; padding: 0 22px; border-radius: var(--r);
}
button.send:disabled { opacity: .5; cursor: progress; }