:root {
  --bg: #1A1A1A;
  --panel: #0f0f0f;
  --line: #2a2a2a;
  --ink: #f0f0f0;
  --sub: #666666;
  --accent: #A8E10C;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  height: 100%;
  background: var(--bg);
  color: var(--ink);
  font-family: 'IBM Plex Mono', ui-monospace, monospace;
}

body { display: flex; flex-direction: column; }

.topbar {
  padding: 18px 24px;
  border-bottom: 1px solid var(--line);
  display: flex;
  align-items: baseline;
  gap: 12px;
}
.topbar .prompt { color: var(--accent); font-weight: 700; }
.topbar .sub { color: var(--sub); font-size: 13px; }

.chat {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: flex;
  flex-direction: column;
  gap: 14px;
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}

.bubble {
  max-width: 78%;
  padding: 11px 15px;
  border-radius: 3px;
  font-size: 14px;
  line-height: 1.5;
  white-space: pre-wrap;
}
.bubble.user {
  align-self: flex-end;
  background: #262626;
  border-left: 2px solid var(--accent);
  color: #eaeaea;
}
.bubble.bot {
  align-self: flex-start;
  background: var(--panel);
  border-left: 2px solid #444;
  color: #c9c9c9;
}
.bubble b { color: var(--accent); }
.bubble.error { border-left-color: #e14c4c; color: #e0a0a0; }

.input-row {
  display: flex;
  gap: 8px;
  padding: 14px 24px 24px;
  border-top: 1px solid var(--line);
  max-width: 760px;
  margin: 0 auto;
  width: 100%;
}
.box {
  flex: 1;
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 10px 14px;
  font: 400 13px 'IBM Plex Mono', monospace;
  color: var(--ink);
  border-radius: 0;
}
.box:focus { outline: 2px solid var(--accent); outline-offset: -1px; }
.box::placeholder { color: var(--sub); }

.send {
  background: var(--accent);
  color: #111;
  font: 700 12px 'IBM Plex Mono', monospace;
  padding: 10px 16px;
  white-space: nowrap;
  border: none;
  cursor: pointer;
}
.send:hover { filter: brightness(1.1); }
.send:disabled { opacity: 0.5; cursor: not-allowed; }