:root {
  --bg: #f1f5f9;
  --panel: #fff;
  --border: #e2e8f0;
  --text: #0f172a;
  --muted: #64748b;
  --accent: #0284c7;
  --accent-dark: #0369a1;
  --error-bg: #fef2f2;
  --error-border: #fecaca;
  --error-text: #991b1b;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  height: 100vh;
  background: var(--bg);
  color: var(--text);
  font: 15px/1.55 system-ui, 'Segoe UI', Roboto, sans-serif;
}

.app {
  max-width: 900px;
  height: 100%;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  background: #f8fafc;
}

.header {
  padding: 12px 20px;
  background: var(--panel);
  border-bottom: 1px solid var(--border);
}

.header h1 {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
}

.header p {
  margin: 2px 0 0;
  font-size: 12px;
  color: var(--muted);
}

.messages {
  flex: 1;
  overflow-y: auto;
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.banner {
  padding: 12px 16px;
  border: 1px solid var(--error-border);
  background: var(--error-bg);
  color: var(--error-text);
  border-radius: 10px;
  font-size: 14px;
}

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

.suggested-label {
  margin: 0;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
}

.chip {
  padding: 10px 16px;
  text-align: left;
  font: inherit;
  font-size: 14px;
  background: var(--panel);
  border: 1px solid var(--border);
  border-radius: 12px;
  cursor: pointer;
}

.chip:hover {
  border-color: var(--accent);
  background: #f0f9ff;
}

.row {
  display: flex;
}

.row-user {
  justify-content: flex-end;
}

.row-bot {
  justify-content: flex-start;
}

.bubble {
  max-width: 85%;
  padding: 10px 16px;
  border-radius: 16px;
}

.bubble-user {
  background: var(--accent);
  color: #fff;
  border-bottom-right-radius: 4px;
  white-space: pre-wrap;
}

.bubble-bot {
  background: var(--panel);
  border: 1px solid var(--border);
  border-bottom-left-radius: 4px;
}

.bubble-error {
  background: var(--error-bg);
  border-color: var(--error-border);
  color: var(--error-text);
}

.notice {
  color: var(--muted);
  font-size: 14px;
}

/* markdown do markdown.js sinh ra */
.md > :first-child {
  margin-top: 0;
}

.md > :last-child {
  margin-bottom: 0;
}

.md p {
  margin: 0 0 10px;
}

.md h3,
.md h4,
.md h5,
.md h6 {
  margin: 14px 0 6px;
  font-size: 15px;
}

.md ul,
.md ol {
  margin: 0 0 10px;
  padding-left: 22px;
}

.md li {
  margin-bottom: 4px;
}

.md a {
  color: var(--accent-dark);
}

.md code {
  padding: 1px 5px;
  background: #f1f5f9;
  border-radius: 4px;
  font-size: 13px;
}

.md pre {
  margin: 0 0 10px;
  padding: 10px 12px;
  background: #f1f5f9;
  border-radius: 8px;
  overflow-x: auto;
}

.md pre code {
  padding: 0;
  background: none;
}

.sources {
  margin-top: 12px;
  padding-top: 8px;
  border-top: 1px solid var(--border);
}

.sources-label {
  margin: 0 0 4px;
  font-size: 12px;
  font-weight: 600;
  color: var(--muted);
}

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

.sources li {
  font-size: 13px;
}

.sources a {
  color: var(--accent-dark);
}

.composer {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  padding: 12px 20px;
  background: var(--panel);
  border-top: 1px solid var(--border);
}

.composer textarea {
  flex: 1;
  min-height: 44px;
  max-height: 160px;
  padding: 10px 12px;
  font: inherit;
  font-size: 14px;
  border: 1px solid #cbd5e1;
  border-radius: 12px;
  resize: vertical;
}

.composer textarea:focus {
  outline: none;
  border-color: var(--accent);
}

.composer button {
  height: 44px;
  padding: 0 20px;
  font: inherit;
  font-size: 14px;
  font-weight: 500;
  color: #fff;
  background: var(--accent);
  border: none;
  border-radius: 12px;
  cursor: pointer;
}

.composer button:hover {
  background: var(--accent-dark);
}

.composer button:disabled {
  background: #cbd5e1;
  cursor: default;
}

#stop {
  background: #475569;
}

#stop:hover {
  background: #334155;
}