:root {
  --claude: #c15f3c;
  --claude-bg: #f6e5de;
  --gemini: #3b73e0;
  --gemini-bg: #dde8fb;
  --llama: #7a5cd0;
  --llama-bg: #e8e1f7;

  --ink: #1f2328;
  --muted: #6b7280;
  --line: #e2e2e2;
  --panel: #ffffff;
  --page: #f4f3ef;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  background: var(--page);
  color: var(--ink);
  font-family: "Segoe UI", system-ui, -apple-system, Helvetica, Arial, sans-serif;
  line-height: 1.55;
}

.app {
  max-width: 760px;
  margin: 0 auto;
  padding: 24px 20px 32px;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.header h1 {
  font-size: 1.55rem;
  margin: 0 0 6px;
}

.subhead {
  font-size: 1.02rem;
  font-weight: 600;
  color: var(--ink);
  margin: 0 0 10px;
}

.tagline {
  margin: 8px 0;
  color: var(--ink);
  font-size: 0.92rem;
}

/* Legend ------------------------------------------------------------------ */
.legend {
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  margin: 18px 0 10px;
  padding: 10px 14px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.88rem;
}

.legend-item {
  display: inline-flex;
  align-items: center;
  gap: 7px;
}

.legend-model {
  color: var(--muted);
  font-size: 0.78rem;
}

.swatch {
  width: 14px;
  height: 14px;
  border-radius: 3px;
  display: inline-block;
}

.head-claude {
  background: var(--claude);
}

.head-gemini {
  background: var(--gemini);
}

.head-llama {
  background: var(--llama);
}

/* Mode banner ------------------------------------------------------------- */
.banner {
  margin: 6px 0 0;
  padding: 9px 12px;
  border-radius: 8px;
  font-size: 0.85rem;
  border: 1px solid var(--line);
  background: #fffaf0;
  color: #7a5b17;
}

/* Transcript -------------------------------------------------------------- */
.transcript {
  flex: 1;
  margin: 16px 0;
  padding: 4px 2px;
  overflow-y: auto;
}

.empty-state {
  color: var(--muted);
  text-align: center;
  padding: 40px 10px;
  font-size: 0.95rem;
}

.message {
  margin: 0 0 18px;
}

.message .role {
  font-size: 0.72rem;
  letter-spacing: 0.05em;
  text-transform: uppercase;
  color: var(--muted);
  margin-bottom: 5px;
}

.bubble {
  border: 1px solid var(--line);
  border-radius: 10px;
  padding: 11px 14px;
  background: var(--panel);
  white-space: pre-wrap;
  word-wrap: break-word;
}

.message.user .bubble {
  background: #eef1f4;
}

/* Coloured tokens --------------------------------------------------------- */
.token {
  border-radius: 2px;
  padding: 1px 0;
  transition: background 0.15s ease;
}

.token.head-claude {
  background: var(--claude-bg);
  box-shadow: inset 0 -2px 0 var(--claude);
}

.token.head-gemini {
  background: var(--gemini-bg);
  box-shadow: inset 0 -2px 0 var(--gemini);
}

.token.head-llama {
  background: var(--llama-bg);
  box-shadow: inset 0 -2px 0 var(--llama);
}

.cursor {
  display: inline-block;
  width: 7px;
  height: 1.05em;
  vertical-align: text-bottom;
  background: var(--ink);
  margin-left: 1px;
  animation: blink 1s steps(2, start) infinite;
}

@keyframes blink {
  50% {
    opacity: 0;
  }
}

/* Composer ---------------------------------------------------------------- */
.composer {
  display: flex;
  gap: 8px;
  position: sticky;
  bottom: 0;
  padding-top: 6px;
  background: var(--page);
}

.prompt-input {
  flex: 1;
  padding: 11px 13px;
  border: 1px solid var(--line);
  border-radius: 8px;
  font-size: 0.98rem;
  background: var(--panel);
  color: var(--ink);
}

.prompt-input:focus {
  outline: 2px solid #c9d3e4;
  border-color: #c9d3e4;
}

.send-button {
  padding: 0 20px;
  border: none;
  border-radius: 8px;
  background: var(--ink);
  color: #fff;
  font-size: 0.95rem;
  cursor: pointer;
}

.send-button:disabled {
  opacity: 0.5;
  cursor: default;
}

.error {
  color: #b42318;
  font-size: 0.85rem;
  margin-top: 6px;
}

/* Caveats (footer below the app) ------------------------------------------ */
.caveats {
  max-width: 760px;
  margin: 0 auto;
  padding: 22px 20px 40px;
  border-top: 1px solid var(--line);
  color: var(--muted);
  font-size: 0.85rem;
  line-height: 1.55;
}

.caveats h2 {
  margin: 0 0 10px;
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--ink);
}

.caveats ul {
  margin: 0;
  padding-left: 18px;
}

.caveats li {
  margin: 0 0 9px;
}

.caveats li:last-child {
  margin-bottom: 0;
}