:root {
  /* Stanford web colors — Lagunita teal for Model A, Cardinal Red for
     Model B, Stanford Black for text, Fog/grey tints for surfaces.
     identity.stanford.edu/design-elements/color/ */
  --bg: #F4F4F4;             /* Fog Light */
  --bg-warm: #EAEAEA;        /* Black 10% tint */
  --card: #FFFFFF;
  --card-elev: #FAFAFA;
  --border: #D5D5D4;         /* Black 20% tint */
  --border-soft: #EAEAEA;    /* Black 10% tint */
  --text: #2E2D29;           /* Stanford Black */
  --text-muted: #53565A;     /* Cool Grey */
  --text-light: #43423E;     /* Black 90% tint */
  --a: #007C92;              /* Model A: Lagunita */
  --a-glow: rgba(0, 124, 146, 0.22);
  --a-soft: rgba(0, 124, 146, 0.10);
  --b: #544948;              /* Model B: Stone Dark (Stanford accent grey) */
  --b-glow: rgba(84, 73, 72, 0.22);
  --b-soft: rgba(84, 73, 72, 0.10);
  --accent: #E98300;         /* Poppy */
  --danger: #820000;         /* Cardinal Dark */
  --success: #017E7C;        /* Palo Verde Dark */
  --warn: #E98300;           /* Poppy */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 14px;
  --shadow-sm: 0 1px 2px rgba(46, 45, 41, 0.06);
  --shadow-md: 0 8px 28px rgba(46, 45, 41, 0.09);
  --font-body: 'DM Sans', -apple-system, BlinkMacSystemFont, sans-serif;
  --font-display: 'Space Grotesk', -apple-system, sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', Menlo, monospace;
}

* { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: var(--font-body);
  color: var(--text);
  background: var(--bg);
  height: 100vh;
  overflow: hidden;
  overflow-x: hidden;
  max-width: 100vw;
}

body {
  display: grid;
  grid-template-rows: auto 1fr auto;
  height: 100vh;
  background-color: var(--bg);
  background-image:
    radial-gradient(ellipse 80% 50% at 10% 0%, rgba(0, 124, 146, 0.06), transparent 60%),
    radial-gradient(ellipse 80% 50% at 90% 100%, rgba(84, 73, 72, 0.06), transparent 60%),
    linear-gradient(rgba(46, 45, 41, 0.025) 1px, transparent 1px),
    linear-gradient(90deg, rgba(46, 45, 41, 0.025) 1px, transparent 1px);
  background-size: 100% 100%, 100% 100%, 32px 32px, 32px 32px;
  background-attachment: fixed;
}

/* ============ Header ============ */
.app-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.75rem 1.25rem;
  background: rgba(255, 255, 255, 0.85);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
  backdrop-filter: blur(8px);
  position: relative;
}

.app-header::after {
  content: '';
  position: absolute;
  left: 0; right: 0; bottom: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--a) 30%, var(--b) 70%, transparent);
  opacity: 0.55;
}

.brand {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  min-width: 0;
  flex-shrink: 1;
}

.brand > div { min-width: 0; }

.brand-mark {
  width: 32px;
  height: 32px;
  border-radius: 5px;
  background: conic-gradient(from 135deg at 50% 50%,
    var(--a) 0deg, var(--a) 90deg,
    var(--b) 90deg, var(--b) 180deg,
    var(--a) 180deg, var(--a) 270deg,
    var(--b) 270deg);
  box-shadow: 0 4px 12px rgba(0, 124, 146, 0.25), inset 0 0 0 1px rgba(255,255,255,0.4);
  position: relative;
  transform: rotate(45deg);
}

.brand-mark::after {
  content: '';
  position: absolute;
  inset: 6px;
  background: var(--card);
  border-radius: 2px;
}

.brand h1 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  margin: 0;
  line-height: 1.15;
  letter-spacing: 0.6px;
  text-transform: uppercase;
  background: linear-gradient(90deg, var(--a), var(--b));
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}
.brand-word { display: inline; }

.subtitle {
  margin: 0;
  font-size: 0.7rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.2px;
  line-height: 1.35;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.header-actions {
  display: flex;
  gap: 0.5rem;
  flex-shrink: 0;
}

/* ============ Buttons ============ */
.ghost-btn, .primary-btn, .load-btn {
  font-family: inherit;
  font-size: 0.78rem;
  font-weight: 500;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  white-space: nowrap;
}

.ghost-btn {
  padding: 0.4rem 0.75rem;
  background: var(--card);
  color: var(--text-light);
  border: 1px solid var(--border);
  letter-spacing: 0.3px;
}

.ghost-btn:hover:not(:disabled) {
  border-color: var(--a);
  color: var(--a);
  box-shadow: 0 0 0 3px var(--a-soft);
}

.ghost-btn:disabled {
  opacity: 0.45;
  cursor: not-allowed;
}

.ghost-btn .icon {
  font-size: 1rem;
  line-height: 1;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

/* Lucide injects <svg class="lucide ..."> in place of our <i data-lucide>.
   It preserves the class we set on the <i>, so .icon styles still apply. */
.ghost-btn svg.lucide,
.primary-btn svg.lucide {
  width: 16px;
  height: 16px;
  stroke-width: 2;
}
.primary-btn svg.lucide { width: 14px; height: 14px; }
.kb-toggle-icon.lucide,
svg.kb-toggle-icon {
  width: 14px;
  height: 14px;
  stroke-width: 2;
}
.msg-sources summary svg.lucide {
  width: 12px;
  height: 12px;
  stroke-width: 2.2;
}

.primary-btn {
  padding: 0.55rem 1.1rem;
  background: linear-gradient(135deg, var(--a) 0%, var(--b) 100%);
  color: #fff;
  border: none;
  font-weight: 700;
  letter-spacing: 0.5px;
  text-transform: uppercase;
  font-size: 0.75rem;
  box-shadow: 0 4px 14px rgba(0, 124, 146, 0.3);
}

.primary-btn:hover:not(:disabled) {
  box-shadow: 0 6px 20px rgba(0, 124, 146, 0.4), 0 0 0 3px var(--b-soft);
  transform: translateY(-1px);
}

.primary-btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
  background: var(--border);
  color: var(--text-muted);
  box-shadow: none;
}

.load-btn {
  padding: 0.3rem 0.75rem;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text-light);
  text-transform: uppercase;
  font-size: 0.7rem;
  letter-spacing: 0.6px;
  font-weight: 600;
}

.pane-a .load-btn:hover:not(:disabled) { border-color: var(--a); color: var(--a); box-shadow: 0 0 0 3px var(--a-soft); }
.pane-b .load-btn:hover:not(:disabled) { border-color: var(--b); color: var(--b); box-shadow: 0 0 0 3px var(--b-soft); }

.load-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* ============ Lab grid ============ */
.lab {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 1px;
  background: var(--border);
  overflow: hidden;
  min-height: 0;
}

/* Solo mode: Model B is hidden, Model A fills the full width (and the
   full height on mobile, since the mobile media query stacks panes). */
.lab.solo {
  grid-template-columns: 1fr;
  grid-template-rows: 1fr;
}
.lab.solo .pane-b { display: none; }

/* Compare button visually reflects state — filled when on, ghost when off */
#compare-btn.is-off {
  color: var(--text-muted);
}
#compare-btn.is-off:hover {
  color: var(--a);
}

.pane {
  display: flex;
  flex-direction: column;
  background: var(--bg);
  min-height: 0;
  overflow: hidden;
  position: relative;
}

.pane-a::before,
.pane-b::before {
  content: '';
  position: absolute;
  top: 0; left: 0; right: 0;
  height: 2px;
  z-index: 1;
  pointer-events: none;
}

.pane-a::before { background: linear-gradient(90deg, transparent, var(--a), transparent); opacity: 0.7; }
.pane-b::before { background: linear-gradient(90deg, transparent, var(--b), transparent); opacity: 0.7; }

.pane-header {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.6rem 0.85rem;
  background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.pane-dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  flex-shrink: 0;
}

.pane-a .pane-dot { background: var(--a); box-shadow: 0 0 0 3px var(--a-soft); }
.pane-b .pane-dot { background: var(--b); box-shadow: 0 0 0 3px var(--b-soft); }

/* Live activity state badge in pane header */
.pane-state {
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 2px 8px;
  font-size: 0.64rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  border-radius: 3px;
  font-family: var(--font-mono);
}

.pane-state[hidden] { display: none; }

.pane-state.queued {
  color: var(--text-muted);
  background: var(--bg-warm);
  border: 1px solid var(--border);
}

.pane-state.thinking,
.pane-state.generating {
  color: #fff;
}

.pane-a .pane-state.thinking,
.pane-a .pane-state.generating { background: var(--a); box-shadow: 0 0 0 2px var(--a-soft); }
.pane-b .pane-state.thinking,
.pane-b .pane-state.generating { background: var(--b); box-shadow: 0 0 0 2px var(--b-soft); }

.pane-state .spinner {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 1s ease-in-out infinite;
}

@keyframes pulse {
  0%, 100% { opacity: 0.35; transform: scale(0.85); }
  50% { opacity: 1; transform: scale(1.1); }
}

.pane-label {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-light);
}

.pane-a .pane-label { color: var(--a); }
.pane-b .pane-label { color: var(--b); }

/* Rich picker button replacement for <select> */
.model-picker-btn {
  flex: 1;
  min-width: 0;
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.35rem 0.55rem;
  font-family: var(--font-body);
  font-size: 0.82rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-warm);
  color: var(--text);
  cursor: pointer;
  text-align: left;
  transition: all 0.12s ease;
}

.model-picker-btn:hover {
  background: var(--card);
  border-color: var(--text-muted);
}

.pane-a .model-picker-btn:focus-visible {
  outline: none;
  border-color: var(--a);
  box-shadow: 0 0 0 3px var(--a-soft);
}
.pane-b .model-picker-btn:focus-visible {
  outline: none;
  border-color: var(--b);
  box-shadow: 0 0 0 3px var(--b-soft);
}

.picker-name {
  font-weight: 600;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  min-width: 0;
  flex: 1;
}

.picker-size {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  flex-shrink: 0;
}

.picker-caret.lucide,
svg.picker-caret { width: 14px; height: 14px; opacity: 0.6; flex-shrink: 0; }

/* ============ Status / progress ============ */
.pane-status {
  padding: 0.5rem 0.85rem;
  background: var(--card);
  border-bottom: 1px solid var(--border-soft);
  font-size: 0.72rem;
  color: var(--text-muted);
  flex-shrink: 0;
  font-family: var(--font-mono);
}

.pane-status.hidden { display: none; }

.status-text {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.status-text.error { color: var(--danger); }
.status-text.ready { color: var(--success); }

.progress {
  margin-top: 0.4rem;
  height: 2px;
  background: var(--border-soft);
  border-radius: 2px;
  overflow: hidden;
  display: none;
}

.progress.active { display: block; }

.progress-bar {
  height: 100%;
  width: 0%;
  background: var(--a);
  box-shadow: 0 0 8px var(--a-glow);
  transition: width 0.2s ease;
}

.pane-b .progress-bar { background: var(--b); box-shadow: 0 0 8px var(--b-glow); }

.progress-bar.indeterminate {
  width: 30%;
  animation: indeterminate 1.4s ease-in-out infinite;
}

@keyframes indeterminate {
  0% { transform: translateX(-100%); }
  100% { transform: translateX(400%); }
}

/* ============ Prompt editor ============ */
.prompt-editor {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.prompt-editor summary {
  padding: 0.45rem 0.85rem;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.prompt-editor summary::before {
  content: '▸';
  font-size: 0.7rem;
  transition: transform 0.15s ease;
  color: var(--a);
}

.pane-b .prompt-editor summary::before { color: var(--b); }

.prompt-editor[open] summary::before {
  transform: rotate(90deg);
}

.prompt-editor summary::-webkit-details-marker { display: none; }

.system-prompt {
  width: 100%;
  min-height: 70px;
  max-height: 200px;
  padding: 0.6rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.5;
  color: var(--text);
  background: var(--bg-warm);
  border: none;
  border-top: 1px solid var(--border-soft);
  resize: vertical;
  display: block;
}

.system-prompt:focus {
  outline: none;
  background: #fff;
  box-shadow: inset 0 0 0 1px var(--a);
}

.pane-b .system-prompt:focus { box-shadow: inset 0 0 0 1px var(--b); }

/* ============ Generation settings ============ */
.gen-settings {
  background: var(--card);
  border-bottom: 1px solid var(--border);
  flex-shrink: 0;
}

.gen-settings summary {
  padding: 0.45rem 0.85rem;
  font-family: var(--font-display);
  font-size: 0.68rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  list-style: none;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.gen-settings summary::before {
  content: '▸';
  font-size: 0.7rem;
  transition: transform 0.15s ease;
  color: var(--a);
}

.pane-b .gen-settings summary::before { color: var(--b); }

.gen-settings[open] summary::before {
  transform: rotate(90deg);
}

.gen-settings summary::-webkit-details-marker { display: none; }

.gen-summary {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 400;
  text-transform: none;
  letter-spacing: 0;
  color: var(--text-muted);
  opacity: 0.85;
}

.gen-controls {
  padding: 0.65rem 0.85rem 0.85rem;
  background: var(--bg-warm);
  border-top: 1px solid var(--border-soft);
  display: flex;
  flex-direction: column;
  gap: 0.7rem;
}

.gen-row {
  display: grid;
  grid-template-columns: 80px 1fr 60px;
  align-items: center;
  gap: 0.6rem;
  font-size: 0.78rem;
}

.gen-row label {
  font-weight: 500;
  color: var(--text-light);
  font-family: var(--font-mono);
  font-size: 0.74rem;
}

.gen-row input[type="range"] {
  width: 100%;
  accent-color: var(--a);
  cursor: pointer;
}

.pane-b .gen-row input[type="range"] {
  accent-color: var(--b);
}

.gen-row input[type="number"] {
  grid-column: 2 / span 2;
  padding: 0.25rem 0.4rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--card);
  color: var(--text);
  width: 100%;
}

.gen-row input[type="number"]:focus {
  outline: none;
  border-color: var(--a);
  box-shadow: 0 0 0 2px var(--a-soft);
}

.pane-b .gen-row input[type="number"]:focus { border-color: var(--b); box-shadow: 0 0 0 2px var(--b-soft); }

.gen-row .gen-val {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 600;
  color: var(--a);
  text-align: right;
}

.pane-b .gen-row .gen-val { color: var(--b); }

.gen-help {
  margin: -0.35rem 0 0.15rem 0;
  font-size: 0.7rem;
  color: var(--text-muted);
  line-height: 1.35;
}

.gen-reset {
  align-self: flex-start;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  padding: 0.25rem 0.6rem;
  border-radius: var(--radius-sm);
  cursor: pointer;
  margin-top: 0.15rem;
}

.gen-reset:hover {
  border-color: var(--text-light);
  color: var(--text);
}

/* ============ Messages ============ */
.messages {
  flex: 1;
  overflow-y: auto;
  padding: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.85rem;
  min-height: 0;
  scroll-behavior: smooth;
}

.empty-state {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  color: var(--text-muted);
  text-align: center;
  gap: 0.6rem;
}

.empty-glyph {
  font-family: var(--font-display);
  font-size: 1.8rem;
  font-weight: 700;
  width: 64px;
  height: 64px;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  background: var(--card);
  border: 1px solid var(--border);
  color: var(--text-muted);
  letter-spacing: 2px;
}

.pane-a .empty-glyph {
  color: var(--a);
  border-color: var(--a);
  box-shadow: 0 0 0 4px var(--a-soft), 0 8px 24px var(--a-soft);
}

.pane-b .empty-glyph {
  color: var(--b);
  border-color: var(--b);
  box-shadow: 0 0 0 4px var(--b-soft), 0 8px 24px var(--b-soft);
}

.empty-state p {
  margin: 0;
  font-size: 0.82rem;
  font-family: var(--font-mono);
  letter-spacing: 0.3px;
}

/* Message bubbles */
.msg {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  max-width: 92%;
  animation: fadeIn 0.15s ease;
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(4px); }
  to { opacity: 1; transform: translateY(0); }
}

.msg.user {
  align-self: flex-end;
  align-items: flex-end;
}

.msg.assistant {
  align-self: flex-start;
  align-items: flex-start;
}

.msg-bubble {
  padding: 0.65rem 0.9rem;
  border-radius: var(--radius-md);
  font-size: 0.88rem;
  line-height: 1.55;
  word-wrap: break-word;
  overflow-wrap: anywhere;
}

/* User messages are plain text — preserve their newlines.
   Assistant messages are rendered HTML from marked, which emits real
   newlines BETWEEN block tags for readability. Those would render as
   visible blank lines under pre-wrap, so we use the normal collapse. */
.msg.user .msg-bubble { white-space: pre-wrap; }
.msg.assistant .msg-bubble { white-space: normal; }

.msg.user .msg-bubble {
  background: linear-gradient(135deg, #FFFFFF 0%, rgba(0, 124, 146, 0.16) 100%);
  color: var(--text);
  font-weight: 500;
  border: 1px solid var(--a);
  border-right-width: 3px;
  border-bottom-right-radius: 3px;
}

.msg.assistant .msg-bubble {
  background: var(--card);
  border: 1px solid var(--border);
  border-bottom-left-radius: 3px;
  box-shadow: var(--shadow-sm);
  color: var(--text);
}

.pane-a .msg.assistant .msg-bubble {
  border-left: 2px solid var(--a);
}

.pane-b .msg.assistant .msg-bubble {
  border-left: 2px solid var(--b);
}

.msg-bubble p { margin: 0 0 0.35rem 0; }
.msg-bubble p:last-child { margin-bottom: 0; }
/* Hide empty paragraphs that some models produce by emitting 3+ \n in a
   row — they'd otherwise create huge gaps between sections. */
.msg-bubble p:empty { display: none; }
.msg-bubble br + br { display: none; }
.msg-bubble ul + p,
.msg-bubble ol + p,
.msg-bubble p + ul,
.msg-bubble p + ol { margin-top: 0.15rem; }
.msg-bubble h1, .msg-bubble h2, .msg-bubble h3,
.msg-bubble h4, .msg-bubble h5, .msg-bubble h6 {
  font-family: var(--font-display);
  font-weight: 700;
  margin: 0.6rem 0 0.3rem;
  letter-spacing: 0.2px;
  line-height: 1.3;
}
.msg-bubble h1 { font-size: 1.05rem; }
.msg-bubble h2 { font-size: 1rem; }
.msg-bubble h3 { font-size: 0.94rem; }
.msg-bubble h4, .msg-bubble h5, .msg-bubble h6 { font-size: 0.88rem; }
.msg-bubble ul, .msg-bubble ol {
  margin: 0.3rem 0 0.5rem;
  padding-left: 1.2rem;
}
.msg-bubble li { margin: 0.15rem 0; }
.msg-bubble li > p { margin: 0; }
.msg-bubble blockquote {
  margin: 0.4rem 0;
  padding: 0.2rem 0 0.2rem 0.7rem;
  border-left: 3px solid var(--border);
  color: var(--text-muted);
}
.msg-bubble hr {
  border: none;
  border-top: 1px solid var(--border);
  margin: 0.6rem 0;
}
.msg-bubble table {
  border-collapse: collapse;
  margin: 0.4rem 0;
  font-size: 0.82rem;
}
.msg-bubble th, .msg-bubble td {
  border: 1px solid var(--border);
  padding: 0.3rem 0.5rem;
  text-align: left;
}
.msg-bubble th { background: var(--bg-warm); font-weight: 600; }
.msg-bubble a {
  color: var(--a);
  text-decoration: underline;
  text-underline-offset: 2px;
}
.pane-b .msg-bubble a { color: var(--b); }
.msg.user .msg-bubble a { color: #fff; }

/* KaTeX inline tweaks */
.msg-bubble .katex { font-size: 1em; }
.msg-bubble .katex-display {
  margin: 0.5rem 0;
  overflow-x: auto;
  overflow-y: hidden;
}

/* Empty / "no response" assistant bubble */
.msg.assistant.empty .msg-bubble {
  background: var(--bg-warm);
  border-style: dashed;
  color: var(--text-muted);
  font-size: 0.8rem;
}
.msg.assistant.empty .msg-bubble em { font-style: italic; }
.msg-bubble code {
  font-family: var(--font-mono);
  font-size: 0.82em;
  padding: 0.1em 0.35em;
  background: var(--bg-warm);
  border-radius: 3px;
  color: var(--a);
}
.pane-b .msg-bubble code { color: var(--b); }
.msg.user .msg-bubble code {
  background: rgba(255, 255, 255, 0.2);
  color: #fff;
}
.msg-bubble pre {
  margin: 0.5rem 0;
  padding: 0.7rem 0.85rem;
  background: var(--bg);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow-x: auto;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  line-height: 1.5;
}
.msg.user .msg-bubble pre {
  background: rgba(0, 0, 0, 0.2);
  border-color: rgba(255, 255, 255, 0.15);
}
.msg-bubble pre code {
  padding: 0;
  background: none;
  color: inherit;
}

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

@keyframes blink {
  to { visibility: hidden; }
}

.msg-meta {
  font-size: 0.66rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  padding: 0 0.25rem;
  letter-spacing: 0.3px;
}

/* Thinking / queued indicators on assistant bubble */
.msg.thinking .msg-bubble,
.msg.queued .msg-bubble {
  color: var(--text-muted);
  font-style: italic;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.msg.queued .msg-bubble {
  background: var(--bg-warm);
  border-style: dashed;
}

.thinking-dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
  animation: pulse 1s ease-in-out infinite;
  opacity: 0.7;
}

/* ============ Composer ============ */
.composer {
  display: flex;
  gap: 0.7rem;
  align-items: stretch;
  padding: 0.65rem 1.1rem;
  background: var(--card);
  border-top: 1px solid var(--border);
  flex-shrink: 0;
  position: relative;
}

.composer::before {
  content: '';
  position: absolute;
  left: 0; right: 0; top: -1px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--a) 30%, var(--b) 70%, transparent);
  opacity: 0.45;
}

#user-input {
  flex: 1;
  resize: none;
  padding: 0.55rem 0.85rem;
  font-family: inherit;
  font-size: 0.9rem;
  line-height: 1.4;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-warm);
  color: var(--text);
  max-height: 160px;
  min-height: 40px;
}

#user-input::placeholder { color: var(--text-muted); }

#user-input:focus {
  outline: none;
  border-color: var(--a);
  background: #fff;
  box-shadow: 0 0 0 3px var(--a-soft);
}

.composer-actions {
  display: flex;
  flex-direction: column;
  align-items: flex-end;
  justify-content: center;
  gap: 0.3rem;
}

.composer-actions .hint {
  font-size: 0.66rem;
  color: var(--text-muted);
  text-align: right;
  font-family: var(--font-mono);
  letter-spacing: 0.3px;
  line-height: 1.2;
}

.composer-buttons {
  display: flex;
  gap: 0.35rem;
}

.composer-buttons button {
  justify-content: center;
}

/* Hide the Stop button entirely when nothing is streaming — keeps the
   composer slim and avoids a dangling disabled control. */
#stop-btn:disabled { display: none; }

/* ============ Banner ============ */
.banner {
  position: fixed;
  bottom: 110px;
  left: 50%;
  transform: translateX(-50%);
  max-width: 540px;
  width: calc(100% - 2rem);
  padding: 0.75rem 2.5rem 0.75rem 1rem;
  background: #FDF4E5;  /* Poppy 0.10 over white */
  border: 1px solid var(--warn);
  border-radius: var(--radius-md);
  font-size: 0.8rem;
  color: var(--text);
  box-shadow: var(--shadow-md);
  z-index: 100;
}

.banner strong { color: var(--warn); }

.banner-close {
  position: absolute;
  top: 0.4rem;
  right: 0.4rem;
  background: none;
  border: none;
  font-size: 1.2rem;
  cursor: pointer;
  color: var(--text-muted);
  padding: 0.2rem 0.5rem;
}

.banner-close:hover { color: var(--text); }

.banner.restore {
  background: #E8F2F4;  /* Lagunita 0.10 over white */
  border: 1px solid var(--a);
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

/* `.banner.restore` sets display:flex which beats the UA `[hidden]` rule;
   force-hide so the dismiss button actually works. */
.banner[hidden] { display: none !important; }

.banner.restore strong { color: var(--a); }

.primary-btn.small {
  padding: 0.35rem 0.7rem;
  font-size: 0.7rem;
}


.pane-status .cached-badge {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  padding: 1px 6px;
  margin-left: 0.4rem;
  font-size: 0.63rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--a);
  background: var(--a-soft);
  border: 1px solid var(--a);
  border-radius: 3px;
}

/* ============ Cache dialog ============ */
#cache-dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0;
  width: 480px;
  max-width: calc(100% - 2rem);
  max-height: 70vh;
  box-shadow: var(--shadow-md);
  background: var(--card);
  color: var(--text);
}

#cache-dialog::backdrop {
  background: rgba(15, 27, 45, 0.35);
  backdrop-filter: blur(4px);
}

.dialog-inner {
  display: flex;
  flex-direction: column;
  background: var(--card);
}

.dialog-header {
  padding: 1rem 1.25rem 0.5rem;
}

.dialog-header h2 {
  font-family: var(--font-display);
  font-size: 1rem;
  margin: 0 0 0.2rem;
  text-transform: uppercase;
  letter-spacing: 1px;
  color: var(--a);
}

.dialog-sub {
  margin: 0;
  font-size: 0.76rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.cache-list {
  max-height: 360px;
  overflow-y: auto;
  padding: 0.5rem 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.cache-row {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.6rem;
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  background: var(--bg-warm);
}

.cache-row .model-id {
  flex: 1;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  min-width: 0;
  word-break: break-all;
  color: var(--text-light);
}

.cache-row .delete-btn {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.25rem 0.55rem;
  font-size: 0.68rem;
  cursor: pointer;
  color: var(--text-muted);
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.cache-row .delete-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}

.cache-empty {
  padding: 1rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

.dialog-footer {
  display: flex;
  justify-content: space-between;
  padding: 0.75rem 1.25rem 1rem;
  gap: 0.5rem;
}

.ghost-btn.danger { color: var(--danger); }
.ghost-btn.danger:hover:not(:disabled) {
  border-color: var(--danger);
  color: var(--danger);
  box-shadow: 0 0 0 3px rgba(130, 0, 0, 0.1);
}

/* ============ Model picker dialog ============ */

#model-picker-dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0;
  width: 720px;
  max-width: calc(100% - 2rem);
  max-height: 86vh;
  box-shadow: var(--shadow-md);
  background: var(--card);
  color: var(--text);
}
#model-picker-dialog::backdrop {
  background: rgba(15, 27, 45, 0.35);
  backdrop-filter: blur(4px);
}

.picker-dialog { display: flex; flex-direction: column; max-height: 86vh; }

#picker-pane-label {
  font-family: var(--font-mono);
  font-size: 0.82rem;
  font-weight: 600;
  margin-left: 0.4rem;
  padding: 1px 8px;
  border-radius: 3px;
  letter-spacing: 0.4px;
}
#picker-pane-label.pane-a { color: var(--a); background: var(--a-soft); border: 1px solid var(--a); }
#picker-pane-label.pane-b { color: var(--b); background: var(--b-soft); border: 1px solid var(--b); }

.picker-tabs {
  display: flex;
  gap: 0.3rem;
  padding: 0 1.25rem;
  margin-top: 0.25rem;
  border-bottom: 1px solid var(--border-soft);
}
.picker-tab {
  background: transparent;
  border: none;
  padding: 0.55rem 0.8rem;
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  cursor: pointer;
  border-bottom: 2px solid transparent;
  margin-bottom: -1px;
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
}
.picker-tab:hover { color: var(--text); }
.picker-tab.active {
  color: var(--a);
  border-bottom-color: var(--a);
}
.picker-tab-count {
  font-family: var(--font-mono);
  font-size: 0.66rem;
  padding: 1px 6px;
  border-radius: 999px;
  background: var(--bg-warm);
  color: var(--text-muted);
}
.picker-tab.active .picker-tab-count { background: var(--a-soft); color: var(--a); }

.picker-search {
  position: relative;
  margin: 0.7rem 1.25rem 0.35rem;
}
.picker-search-icon.lucide,
svg.picker-search-icon {
  position: absolute;
  left: 0.6rem;
  top: 50%;
  transform: translateY(-50%);
  width: 14px;
  height: 14px;
  color: var(--text-muted);
}
#picker-search-input {
  width: 100%;
  padding: 0.5rem 0.7rem 0.5rem 1.9rem;
  font-family: var(--font-body);
  font-size: 0.85rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-warm);
  color: var(--text);
}
#picker-search-input:focus {
  outline: none;
  border-color: var(--a);
  box-shadow: 0 0 0 3px var(--a-soft);
  background: var(--card);
}

.picker-tiles {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.6rem;
  padding: 0.6rem 1.25rem 0.85rem;
  overflow-y: auto;
  flex: 1;
  min-height: 200px;
}

.tile {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  padding: 0.7rem 0.8rem;
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all 0.12s;
  text-align: left;
}
.tile:hover {
  border-color: var(--text-muted);
  box-shadow: var(--shadow-sm);
}
.tile.selected {
  border-color: var(--a);
  box-shadow: 0 0 0 3px var(--a-soft);
}
.tile.loaded-here {
  background: var(--a-soft);
  border-color: var(--a);
}
.tile.too-big { opacity: 0.7; }

.tile-head {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: 0.5rem;
}
.tile-name {
  font-weight: 600;
  font-size: 0.94rem;
  line-height: 1.25;
  color: var(--text);
  min-width: 0;
  overflow-wrap: anywhere;
  word-break: break-word;
}
.tile-cached {
  display: inline-flex;
  align-items: center;
  gap: 0.25rem;
  font-family: var(--font-mono);
  font-size: 0.63rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 7px;
  border-radius: 3px;
  color: var(--success);
  background: rgba(1, 126, 124, 0.08);
  border: 1px solid var(--success);
  flex-shrink: 0;
}

.tile-pills {
  display: flex;
  align-items: center;
  gap: 0.45rem;
}
.tier-pill {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  padding: 2px 7px;
  border-radius: 3px;
}
.tier-quick { color: var(--success); background: rgba(1, 126, 124, 0.08); border: 1px solid var(--success); }
.tier-balanced { color: var(--warn); background: rgba(233, 131, 0, 0.10); border: 1px solid var(--warn); }
.tier-smart { color: var(--a); background: var(--a-soft); border: 1px solid var(--a); }
.tier-heavy { color: var(--text-muted); background: var(--bg-warm); border: 1px solid var(--border); }
.tile-phone-hint {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.4px;
  padding: 2px 6px;
  border-radius: 3px;
  color: var(--warn);
  background: rgba(233, 131, 0, 0.10);
  border: 1px solid var(--warn);
}
.tile-size {
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-light);
}

.tile-tagline {
  font-size: 0.82rem;
  color: var(--text-light);
  line-height: 1.4;
  flex: 1;
}

.tile-foot {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.4rem;
  margin-top: 0.15rem;
}
.tile-last-used {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}
.tile-details-btn {
  background: none;
  border: none;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  cursor: pointer;
  padding: 2px 4px;
  border-radius: 3px;
}
.tile-details-btn:hover {
  color: var(--text);
  background: var(--bg-warm);
}

.tile-details {
  margin-top: 0.35rem;
  padding: 0.5rem 0.65rem;
  background: var(--bg-warm);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-light);
  line-height: 1.5;
}
.tile-details .tile-id {
  display: block;
  word-break: break-all;
  margin-bottom: 0.35rem;
  color: var(--text-muted);
}

.picker-empty {
  grid-column: 1 / -1;
  padding: 2rem 1rem;
  text-align: center;
  color: var(--text-muted);
  font-family: var(--font-mono);
  font-size: 0.85rem;
}

/* ============ Knowledge base ============ */

/* Count badge on the Knowledge header button */
.badge-count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  font-weight: 700;
  color: #fff;
  background: linear-gradient(135deg, var(--a) 0%, var(--b) 100%);
  border-radius: 9px;
  margin-left: 0.3rem;
}
/* The `display: inline-flex` above overrides the UA's [hidden]
   { display: none } rule, so we explicitly re-hide. */
.badge-count[hidden] { display: none; }

/* Per-pane "Use knowledge" toggle row */
.kb-toggle {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: var(--card);
  border-bottom: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
  cursor: pointer;
  user-select: none;
  flex-shrink: 0;
}

.kb-toggle .kb-toggle-input {
  appearance: none;
  -webkit-appearance: none;
  width: 28px;
  height: 16px;
  background: var(--border);
  border-radius: 999px;
  position: relative;
  cursor: pointer;
  transition: background 0.15s;
  flex-shrink: 0;
}

.kb-toggle .kb-toggle-input::after {
  content: "";
  position: absolute;
  top: 2px;
  left: 2px;
  width: 12px;
  height: 12px;
  background: #fff;
  border-radius: 50%;
  transition: left 0.15s;
  box-shadow: 0 1px 2px rgba(0, 0, 0, 0.15);
}

.pane-a .kb-toggle .kb-toggle-input:checked { background: var(--a); }
.pane-b .kb-toggle .kb-toggle-input:checked { background: var(--b); }
.kb-toggle .kb-toggle-input:checked::after { left: 14px; }

.kb-toggle-icon {
  font-size: 0.85rem;
  opacity: 0.7;
}

.kb-toggle-label {
  letter-spacing: 0.4px;
  text-transform: uppercase;
  font-size: 0.66rem;
  font-weight: 600;
}

.kb-toggle-meta {
  margin-left: auto;
  font-size: 0.66rem;
  opacity: 0.7;
}

.pane-a .kb-toggle.active { color: var(--a); }
.pane-b .kb-toggle.active { color: var(--b); }
.kb-toggle.disabled { opacity: 0.6; }

/* Per-pane RAG strictness slider — only visible when toggle is on */
.kb-threshold {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.35rem 0.85rem;
  background: var(--card);
  border-bottom: 1px solid var(--border-soft);
  font-family: var(--font-mono);
  font-size: 0.66rem;
  color: var(--text-muted);
  flex-shrink: 0;
}
.kb-threshold[hidden] { display: none; }
.kb-threshold-label {
  text-transform: uppercase;
  letter-spacing: 0.5px;
  font-weight: 600;
  white-space: nowrap;
}
.kb-threshold-input {
  flex: 1;
  cursor: pointer;
}
.pane-a .kb-threshold-input { accent-color: var(--a); }
.pane-b .kb-threshold-input { accent-color: var(--b); }
.kb-threshold-val {
  min-width: 32px;
  text-align: right;
  font-weight: 700;
}
.pane-a .kb-threshold-val { color: var(--a); }
.pane-b .kb-threshold-val { color: var(--b); }

/* "Searched · nothing relevant" footer under assistant message */
.msg-search-note {
  display: inline-flex;
  align-items: center;
  gap: 0.35rem;
  margin-top: 0.3rem;
  padding: 2px 8px;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  color: var(--text-muted);
  background: var(--bg-warm);
  border: 1px dashed var(--border);
  border-radius: 3px;
  letter-spacing: 0.2px;
}
.msg-search-note svg.lucide {
  width: 11px;
  height: 11px;
  opacity: 0.7;
}

/* Knowledge dialog */
#knowledge-dialog {
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  padding: 0;
  width: 560px;
  max-width: calc(100% - 2rem);
  max-height: 80vh;
  box-shadow: var(--shadow-md);
  background: var(--card);
  color: var(--text);
}
#knowledge-dialog::backdrop {
  background: rgba(15, 27, 45, 0.35);
  backdrop-filter: blur(4px);
}

.kb-status {
  margin: 0.5rem 1.25rem;
  padding: 0.5rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-muted);
  background: var(--bg-warm);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
}
.kb-status[data-kind="loading"],
.kb-status[data-kind="progress"] { color: var(--a); border-color: var(--a); }
.kb-status[data-kind="ready"] { color: var(--success); border-color: var(--success); }
.kb-status[data-kind="error"] { color: var(--danger); border-color: var(--danger); }

.kb-drop {
  margin: 0.5rem 1.25rem;
  padding: 1.1rem 1rem;
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-md);
  background: var(--bg-warm);
  text-align: center;
  transition: all 0.15s;
}
.kb-drop p { margin: 0.15rem 0; font-size: 0.86rem; color: var(--text-light); }
.kb-drop .kb-hint {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}
.kb-drop.drag-over {
  border-color: var(--a);
  background: var(--a-soft);
}
.kb-pick-btn {
  background: none;
  border: none;
  color: var(--a);
  text-decoration: underline;
  cursor: pointer;
  font: inherit;
  padding: 0;
}

.kb-paste {
  margin: 0 1.25rem 0.5rem;
}
.kb-paste summary {
  font-family: var(--font-display);
  font-size: 0.7rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.6px;
  color: var(--text-muted);
  cursor: pointer;
  padding: 0.4rem 0;
  list-style: none;
}
.kb-paste summary::before {
  content: "▸";
  margin-right: 0.4rem;
  color: var(--a);
  display: inline-block;
  transition: transform 0.15s;
}
.kb-paste[open] summary::before { transform: rotate(90deg); }
.kb-paste summary::-webkit-details-marker { display: none; }
.kb-paste input,
.kb-paste textarea {
  width: 100%;
  margin-top: 0.4rem;
  padding: 0.5rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--bg-warm);
  color: var(--text);
}
.kb-paste input:focus,
.kb-paste textarea:focus {
  outline: none;
  border-color: var(--a);
  background: var(--card);
}
.kb-paste #kb-paste-add { margin-top: 0.4rem; }

.kb-doc-list {
  margin: 0.5rem 1.25rem 0.5rem;
  display: flex;
  flex-direction: column;
  gap: 0.35rem;
  max-height: 240px;
  overflow-y: auto;
}
.kb-doc-row {
  display: flex;
  align-items: center;
  gap: 0.6rem;
  padding: 0.55rem 0.7rem;
  background: var(--bg-warm);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
}
.kb-doc-info { flex: 1; min-width: 0; }
.kb-doc-name {
  font-size: 0.85rem;
  font-weight: 500;
  color: var(--text);
  word-break: break-all;
}
.kb-doc-stats {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}
.kb-doc-row .delete-btn,
.kb-doc-row .kb-view-btn {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 0.3rem 0.6rem;
  font-size: 0.68rem;
  font-family: var(--font-mono);
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
}
.kb-doc-row .delete-btn:hover {
  border-color: var(--danger);
  color: var(--danger);
}
.kb-doc-row .kb-view-btn:hover,
.kb-doc-row .kb-view-btn.active {
  border-color: var(--a);
  color: var(--a);
}
.kb-doc-row .kb-view-btn svg.lucide {
  width: 13px;
  height: 13px;
}

.kb-doc-text {
  margin: 0.35rem 0 0.5rem;
  padding: 0.6rem 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  line-height: 1.5;
  color: var(--text-light);
  background: var(--bg-warm);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-sm);
  max-height: 260px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-wrap: break-word;
}
.kb-empty {
  padding: 1rem;
  text-align: center;
  font-size: 0.82rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
}

/* "grounded · N sources" accordion under an assistant message */
.msg-sources {
  margin-top: 0.3rem;
  width: 100%;
  max-width: 100%;
}
.msg-sources summary {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  color: var(--text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  gap: 0.3rem;
  padding: 0.15rem 0.4rem;
  border-radius: 3px;
  list-style: none;
}
.msg-sources summary::-webkit-details-marker { display: none; }
.pane-a .msg-sources summary { color: var(--a); }
.pane-b .msg-sources summary { color: var(--b); }
.msg-sources[open] summary { background: var(--bg-warm); }
.src-list {
  list-style: decimal;
  padding-left: 1.4rem;
  margin: 0.35rem 0 0 0;
}
.src-list li { margin: 0.4rem 0; }
.src-title {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--text-muted);
}
.src-body {
  font-size: 0.78rem;
  color: var(--text-light);
  background: var(--bg-warm);
  border-left: 2px solid var(--border);
  padding: 0.35rem 0.55rem;
  margin-top: 0.2rem;
  border-radius: 0 3px 3px 0;
}
.pane-a .src-body { border-left-color: var(--a); }
.pane-b .src-body { border-left-color: var(--b); }

/* ============ Responsive ============ */

/* Use dynamic viewport units so the layout adjusts when the mobile URL bar
   hides/shows. Falls back to 100vh on older browsers. */
@supports (height: 100dvh) {
  html, body { height: 100dvh; }
  body { height: 100dvh; }
}

/* Tablet / small laptop — stack the two panes vertically and collapse
   header-button labels down to icons. */
@media (max-width: 820px) {
  .lab {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr 1fr;
  }
  .subtitle { display: none; }
  .header-actions .ghost-btn { padding: 0.4rem 0.55rem; gap: 0; }
  .header-actions .ghost-btn .label { display: none; }
  .app-header { padding: 0.6rem 0.85rem; gap: 0.6rem; }

  /* Break "WebLLM | Prompt Lab" onto two lines so the icon row gets the
     horizontal room it needs. */
  .brand h1 { white-space: normal; font-size: 0.95rem; }
  .brand-word-2 { display: block; }
}

/* Phone — tighten paddings, scale type down, wrap the pane header into
   two rows (dot+label on top, model+Load below), and drop the composer
   hint to keep the send button reachable with one hand. */
@media (max-width: 540px) {
  body {
    background-size: 100% 100%, 100% 100%, 24px 24px, 24px 24px;
  }

  .app-header {
    padding: 0.5rem 0.65rem;
    gap: 0.5rem;
  }
  .brand { gap: 0.5rem; min-width: 0; }
  .brand-mark { width: 26px; height: 26px; }
  .brand h1 { font-size: 0.85rem; letter-spacing: 0.4px; }
  .header-actions { gap: 0.3rem; }
  .header-actions .ghost-btn { padding: 0.4rem 0.5rem; font-size: 0.85rem; }
  .header-actions .ghost-btn .icon { font-size: 1rem; }

  /* Force the model picker + Load button onto a second row so they
     don't squeeze the model id into 30px. */
  .pane-header {
    flex-wrap: wrap;
    row-gap: 0.4rem;
    padding: 0.5rem 0.7rem;
  }
  .pane-header::after {
    content: "";
    flex-basis: 100%;
    height: 0;
    order: 1;
  }
  .pane-header .model-picker-btn,
  .pane-header .load-btn { order: 2; }
  .pane-header .model-picker-btn { flex: 1 1 0; min-width: 0; }

  .pane-status { padding: 0.4rem 0.7rem; font-size: 0.68rem; }

  .prompt-editor summary,
  .gen-settings summary {
    padding: 0.45rem 0.7rem;
    font-size: 0.66rem;
  }
  .system-prompt {
    padding: 0.55rem 0.7rem;
    font-size: 0.74rem;
    min-height: 60px;
  }
  .gen-controls { padding: 0.55rem 0.7rem 0.7rem; gap: 0.55rem; }
  .gen-row {
    grid-template-columns: 70px 1fr 48px;
    gap: 0.5rem;
    font-size: 0.74rem;
  }
  .gen-row label { font-size: 0.7rem; }

  .messages {
    padding: 0.75rem 0.65rem;
    gap: 0.7rem;
  }
  .msg { max-width: 96%; }
  .msg-bubble {
    font-size: 0.86rem;
    padding: 0.55rem 0.75rem;
    line-height: 1.5;
  }
  .empty-glyph { width: 56px; height: 56px; font-size: 1.5rem; }

  .composer {
    padding: 0.65rem 0.7rem;
    gap: 0.5rem;
    align-items: stretch;
  }
  /* On phones the hint is redundant with the textarea placeholder, and
     hiding it lets the Stop/Send buttons stretch to the full textarea
     height for a tap-friendly target. */
  .composer-actions {
    gap: 0;
    justify-content: stretch;
  }
  .composer-actions .hint { display: none; }
  .composer-buttons {
    height: 100%;
    align-items: stretch;
    gap: 0.4rem;
  }
  .composer-buttons button {
    padding: 0 0.95rem;
    font-size: 0.78rem;
    min-height: 44px;       /* 44 = WCAG touch target */
    align-self: stretch;
  }
  /* iOS-friendly: keep input at >=16px to suppress auto-zoom on focus. */
  #user-input {
    font-size: 1rem;
    padding: 0.6rem 0.75rem;
    min-height: 44px;
    line-height: 1.4;
  }

  .banner {
    bottom: 92px;
    font-size: 0.75rem;
    padding: 0.6rem 2.2rem 0.6rem 0.8rem;
  }

  /* Dialogs near-fullscreen on phones */
  #cache-dialog,
  #knowledge-dialog,
  #model-picker-dialog {
    width: calc(100% - 1rem);
    max-width: calc(100% - 1rem);
    max-height: 88vh;
  }
  .dialog-header { padding: 0.85rem 1rem 0.4rem; }
  .cache-list { padding: 0.4rem 0.75rem; }
  .dialog-footer { padding: 0.6rem 1rem 0.85rem; gap: 0.4rem; }

  /* Picker: 1-column tile grid so long model names + cached badges
     don't squeeze into 150px and overflow. */
  .picker-tiles {
    grid-template-columns: 1fr;
    padding: 0.5rem 0.85rem 0.7rem;
    gap: 0.5rem;
  }
  .picker-tabs { padding: 0 0.85rem; gap: 0.15rem; }
  .picker-tab { padding: 0.55rem 0.55rem; font-size: 0.68rem; }
  .picker-search { margin: 0.5rem 0.85rem 0.3rem; }

  /* Knowledge dialog tightens */
  .kb-status, .kb-drop, .kb-paste, .kb-doc-list { margin-left: 0.85rem; margin-right: 0.85rem; }

  /* Long doc names inside knowledge rows: wrap, don't horizontally
     overflow the dialog. */
  .kb-doc-name { overflow-wrap: anywhere; word-break: break-word; }
}

/* Extra-narrow phones — drop the brand text so the action icons keep
   breathing room. */
@media (max-width: 360px) {
  .brand h1 { display: none; }
}

/* ============ Accessibility ============ */

/* Visible focus ring on every keyboard-focused control. Uses the model A
   accent by default; pane B contexts already override to violet. */
*:focus { outline: none; }
.ghost-btn:focus-visible,
.primary-btn:focus-visible,
.load-btn:focus-visible,
.kb-pick-btn:focus-visible,
.kb-view-btn:focus-visible,
.kb-doc-row .delete-btn:focus-visible,
.cache-row .delete-btn:focus-visible,
.tile:focus-visible,
.picker-tab:focus-visible,
.tile-details-btn:focus-visible,
.gen-reset:focus-visible,
.banner-close:focus-visible {
  outline: 2px solid var(--a);
  outline-offset: 2px;
  box-shadow: 0 0 0 4px var(--a-soft);
}
.pane-b .tile:focus-visible,
.pane-b .ghost-btn:focus-visible {
  outline-color: var(--b);
  box-shadow: 0 0 0 4px var(--b-soft);
}

/* Skip-link target for keyboard users to jump straight to the composer */
.skip-link {
  position: absolute;
  left: -9999px;
  top: 0;
  z-index: 9999;
  padding: 0.5rem 0.85rem;
  background: var(--text);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  border-radius: 0 0 var(--radius-sm) var(--radius-sm);
}
.skip-link:focus {
  left: 1rem;
  top: 0;
}

/* WCAG-aware touch targets on phones. Vertically 44 (tap accuracy
   matters most along the y-axis on phones). Horizontally we use 36 on
   header buttons because six 44px icons + brand mark won't fit on a
   375px viewport, and WCAG 2.5.8 allows smaller with adequate spacing. */
@media (max-width: 540px) {
  .header-actions .ghost-btn,
  .load-btn,
  .kb-view-btn,
  .kb-doc-row .delete-btn,
  .picker-tab,
  .tile,
  .gen-reset {
    min-height: 44px;
  }
  .header-actions .ghost-btn {
    min-width: 36px;
    padding: 0.4rem 0.45rem;
    justify-content: center;
  }
  .header-actions { gap: 0.2rem; }
}

/* Reduced motion: stop the pulse/blink/indeterminate-bar animations
   and use instant transitions for users who request it. */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}

/* Honor forced-colors mode (Windows High Contrast etc.) by keeping
   structural borders visible. */
@media (forced-colors: active) {
  .ghost-btn, .primary-btn, .load-btn,
  .model-picker-btn, .tile, .kb-doc-row {
    border: 1px solid CanvasText;
  }
}

/* Scrollbar */
.messages::-webkit-scrollbar { width: 8px; }
.messages::-webkit-scrollbar-track { background: transparent; }
.messages::-webkit-scrollbar-thumb {
  background: var(--border);
  border-radius: 4px;
}
.messages::-webkit-scrollbar-thumb:hover { background: var(--text-muted); }