:root {
  --bg: #f6f7f9;
  --card: #ffffff;
  --text: #1f2328;
  --muted: #667085;
  --border: #e6e8ee;
  --primary: #0b5cff;
  --primaryText: #ffffff;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  font-family: system-ui, -apple-system, Segoe UI, Roboto, Arial, sans-serif;
  background: var(--bg);
  color: var(--text);
}

.app {
  width: min(820px, 92vw);
  margin: 28px auto;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: 14px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.06);
  overflow: hidden;
}

.header {
  padding: 16px 18px;
  border-bottom: 1px solid var(--border);
}

.header h1 {
  margin: 0 0 4px;
  font-size: 18px;
}

.subtitle {
  margin: 0;
  font-size: 13px;
  color: var(--muted);
}

.messages {
  padding: 16px 18px;
  height: 55vh;
  overflow-y: auto;
  background: #fbfcfe;
}

.msg {
  margin: 10px 0;
  display: flex;
}

.msg.bot {
  justify-content: flex-start;
}
.msg.user {
  justify-content: flex-end;
}

.bubble {
  max-width: 78%;
  border: 1px solid var(--border);
  background: var(--card);
  border-radius: 12px;
  padding: 10px 12px;
  line-height: 1.35;
  font-size: 14px;
  white-space: pre-wrap;
}

.msg.user .bubble {
  background: #eef4ff;
  border-color: #d8e5ff;
}

.bubble .meta {
  margin-top: 8px;
  font-size: 12px;
  color: var(--muted);
}

.choices {
  margin-top: 10px;
  display: grid;
  gap: 8px;
}

.choice-btn {
  text-align: left;
  width: 100%;
  padding: 10px 10px;
  border-radius: 10px;
  border: 1px solid var(--border);
  background: #fafbff;
  cursor: pointer;
}

.choice-btn:hover {
  border-color: #c9d6ff;
}

.card {
  display: flex;
  flex-direction: column;
  margin-top: 0px;
  padding: 0px;
}

.card h3 {
  font-size: 15px;
}

.card-content {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.kv {
  font-size: 13px;
  color: #2c3340;
}

.kv span {
  color: var(--muted);
}

.composer {
  border-top: 1px solid var(--border);
  padding: 14px 18px;
  display: grid;
  gap: 10px;
}

.fields {
  display: grid;
  gap: 8px;
}

.input,
.textarea {
  width: 100%;
  border: 1px solid var(--border);
  border-radius: 10px;
  padding: 10px 12px;
  font-size: 14px;
  outline: none;
}

.input:focus,
.textarea:focus {
  border-color: #c9d6ff;
  box-shadow: 0 0 0 3px rgba(11, 92, 255, 0.08);
}

.actions {
  display: flex;
  gap: 10px;
}

.btn {
  border: 1px solid var(--border);
  background: var(--card);
  padding: 10px 12px;
  border-radius: 10px;
  cursor: pointer;
}

.spinner {
  display: none;
  width: 16px;
  height: 16px;
  border: 2px solid rgba(0, 0, 0, 0.1);
  border-top-color: rgba(0, 0, 0, 0.35);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-left: 8px;
  vertical-align: middle;
}

@keyframes spin {
  to {
    transform: rotate(360deg);
  }
}

/* small spinner for choice buttons */
.choice-spinner {
  display: inline-block;
  width: 12px;
  height: 12px;
  border: 2px solid rgba(0, 0, 0, 0.1);
  border-top-color: rgba(0, 0, 0, 0.35);
  border-radius: 50%;
  animation: spin 1s linear infinite;
  margin-left: 8px;
  vertical-align: middle;
}

.choice-btn[disabled] {
  opacity: 0.6;
  cursor: not-allowed;
}

.choice-btn.selected {
  background: #eef4ff;
  border-color: #d8e5ff;
}

.btn.primary {
  background: var(--primary);
  border-color: var(--primary);
  color: var(--primaryText);
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

.hint {
  margin: 0;
  color: var(--muted);
  font-size: 12px;
}

#contextInput {
  font-family: sans-serif;
}