:root {
  /* Surfaces */
  --bg-app: #0b0d12;
  --bg-surface: #111418;
  --bg-elevated: #161a20;
  --bg-input: #0e1116;
  --bg-hover: #1a1f26;

  /* Borders */
  --border: #1f242c;
  --border-strong: #2a313b;
  --border-focus: #3a4452;

  /* Text */
  --text-primary: #e6e9ef;
  --text-secondary: #a0a8b4;
  --text-muted: #6b7280;
  --text-faint: #4b5563;

  /* Brand & accents */
  --accent: #6366f1;          /* indigo — primary brand */
  --accent-hover: #7c7ff5;
  --accent-soft: rgba(99, 102, 241, 0.12);
  --accent-cyan: #38bdf8;     /* info */
  --accent-violet: #a78bfa;   /* assistant */
  --accent-green: #10b981;    /* success */
  --accent-amber: #f59e0b;    /* warning */
  --accent-red: #ef4444;      /* danger */

  /* Typography */
  --font-mono: "JetBrains Mono", "SF Mono", ui-monospace, monospace;
  --font-body: "Inter", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;

  /* Geometry */
  --radius-sm: 6px;
  --radius: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;

  /* Shadows */
  --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.25);
  --shadow-focus: 0 0 0 3px rgba(99, 102, 241, 0.18);
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html,
body {
  height: 100%;
}

body {
  background: var(--bg-app);
  color: var(--text-primary);
  font-family: var(--font-body);
  height: 100vh;
  overflow: hidden;
  display: flex;
  flex-direction: column;
  font-size: 14px;
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

#app {
  display: grid;
  grid-template-rows: 60px 1fr;
  height: 100vh;
  overflow: hidden;
  width: 100%;
}

/* ───────────────────────── Header ───────────────────────── */
#header {
  display: flex;
  align-items: center;
  padding: 0 24px;
  gap: 16px;
  background: var(--bg-surface);
  border-bottom: 1px solid var(--border);
  height: 60px;
}

.brand {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
}

.brand-mark {
  width: 34px;
  height: 34px;
  display: grid;
  place-items: center;
  background: linear-gradient(135deg, var(--accent), #8b5cf6);
  border-radius: var(--radius);
  color: white;
  box-shadow: var(--shadow-sm);
}

.brand-text {
  display: flex;
  flex-direction: column;
  line-height: 1.15;
}

.brand-title {
  font-size: 0.95rem;
  font-weight: 600;
  letter-spacing: -0.01em;
  color: var(--text-primary);
}

.brand-sub {
  font-size: 0.72rem;
  color: var(--text-muted);
  font-weight: 500;
}

#header-stats {
  display: flex;
  gap: 8px;
  align-items: center;
}

/* ───────────────────────── Layout ───────────────────────── */
#body {
  display: grid;
  grid-template-columns: 280px 1fr 340px;
  height: 100%;
  overflow: hidden;
}

.panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  border-right: 1px solid var(--border);
  background: var(--bg-app);
}

.panel:last-child {
  border-right: none;
  border-left: 1px solid var(--border);
}

.panel-header {
  padding: 14px 18px;
  border-bottom: 1px solid var(--border);
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 600;
  font-size: 0.78rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  gap: 8px;
  background: var(--bg-surface);
  color: var(--text-secondary);
  height: 48px;
  flex-shrink: 0;
}

.panel-header .label {
  display: flex;
  align-items: center;
  gap: 8px;
}

.panel-header .icon-inline {
  color: var(--accent);
  opacity: 0.9;
}

.panel-body {
  flex: 1;
  overflow-y: auto;
  padding: 16px;
  display: flex;
  flex-direction: column;
}

.panel-footer {
  margin-top: auto;
  padding-top: 16px;
}

/* Scrollbars */
.panel-body::-webkit-scrollbar,
.chat-messages::-webkit-scrollbar,
textarea::-webkit-scrollbar,
pre::-webkit-scrollbar {
  width: 6px;
  height: 6px;
}

.panel-body::-webkit-scrollbar-track,
.chat-messages::-webkit-scrollbar-track,
textarea::-webkit-scrollbar-track,
pre::-webkit-scrollbar-track {
  background: transparent;
}

.panel-body::-webkit-scrollbar-thumb,
.chat-messages::-webkit-scrollbar-thumb,
textarea::-webkit-scrollbar-thumb,
pre::-webkit-scrollbar-thumb {
  background: var(--border-strong);
  border-radius: 3px;
}

.panel-body::-webkit-scrollbar-thumb:hover,
.chat-messages::-webkit-scrollbar-thumb:hover {
  background: var(--border-focus);
}

/* ───────────────────────── Badges ───────────────────────── */
.badge {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 3px 8px;
  border-radius: var(--radius-sm);
  font-size: 0.68rem;
  font-weight: 600;
  white-space: nowrap;
  border: 1px solid transparent;
  font-family: var(--font-mono);
  letter-spacing: 0.02em;
  line-height: 1.4;
}

.badge-cyan {
  background: rgba(56, 189, 248, 0.1);
  color: var(--accent-cyan);
  border-color: rgba(56, 189, 248, 0.3);
}

.badge-green {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.3);
}

.badge-violet {
  background: rgba(167, 139, 250, 0.1);
  color: var(--accent-violet);
  border-color: rgba(167, 139, 250, 0.3);
}

.badge-amber {
  background: rgba(245, 158, 11, 0.1);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.badge-red {
  background: rgba(239, 68, 68, 0.1);
  color: var(--accent-red);
  border-color: rgba(239, 68, 68, 0.3);
}

.badge-gray {
  background: rgba(160, 168, 180, 0.08);
  color: var(--text-secondary);
  border-color: var(--border-strong);
}

.fmt-pdf {
  background: rgba(239, 68, 68, 0.1);
  color: var(--accent-red);
  border-color: rgba(239, 68, 68, 0.3);
}

.fmt-csv {
  background: rgba(16, 185, 129, 0.1);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.3);
}

.fmt-xlsx {
  background: rgba(16, 185, 129, 0.15);
  color: var(--accent-green);
  border-color: rgba(16, 185, 129, 0.4);
}

.fmt-pptx {
  background: rgba(245, 158, 11, 0.1);
  color: var(--accent-amber);
  border-color: rgba(245, 158, 11, 0.3);
}

.fmt-docx {
  background: rgba(99, 102, 241, 0.12);
  color: var(--accent);
  border-color: rgba(99, 102, 241, 0.35);
}

.fmt-txt,
.fmt-md {
  background: rgba(160, 168, 180, 0.08);
  color: var(--text-secondary);
  border-color: var(--border-strong);
}

/* ───────────────────────── Buttons ───────────────────────── */
.btn {
  cursor: pointer;
  border: 1px solid transparent;
  border-radius: var(--radius);
  padding: 9px 16px;
  font-family: var(--font-body);
  font-size: 0.85rem;
  font-weight: 500;
  transition: all 0.15s ease;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 7px;
  white-space: nowrap;
}

.btn-primary {
  background: var(--accent);
  color: #ffffff;
  font-weight: 600;
  box-shadow: var(--shadow-sm);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
}

.btn-primary:focus-visible {
  outline: none;
  box-shadow: var(--shadow-focus);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
}

.btn-ghost:hover:not(:disabled) {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background: var(--bg-hover);
}

.btn-danger {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-strong);
}

.btn-danger:hover:not(:disabled) {
  border-color: rgba(239, 68, 68, 0.5);
  background: rgba(239, 68, 68, 0.08);
  color: var(--accent-red);
}

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

.btn-icon {
  background: transparent;
  border: 1px solid transparent;
  color: var(--text-muted);
  padding: 6px;
  border-radius: var(--radius-sm);
  cursor: pointer;
  display: inline-grid;
  place-items: center;
  transition: all 0.15s ease;
}

.btn-icon:hover {
  color: var(--text-primary);
  background: var(--bg-hover);
}

/* ───────────────────────── Drop zone ───────────────────────── */
.drop-zone {
  border: 1.5px dashed var(--border-strong);
  border-radius: var(--radius-lg);
  padding: 28px 16px;
  text-align: center;
  cursor: pointer;
  transition: all 0.18s ease;
  background: var(--bg-input);
}

.drop-zone:hover,
.drop-zone.drag-over {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop-zone .drop-icon {
  width: 44px;
  height: 44px;
  margin: 0 auto 10px;
  border-radius: 50%;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  display: grid;
  place-items: center;
  color: var(--accent);
  transition: all 0.18s ease;
}

.drop-zone:hover .drop-icon,
.drop-zone.drag-over .drop-icon {
  border-color: var(--accent);
  background: var(--accent-soft);
}

.drop-zone .title {
  font-size: 0.875rem;
  color: var(--text-primary);
  font-weight: 600;
  margin-bottom: 4px;
}

.drop-zone .subtitle {
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-bottom: 12px;
}

.drop-zone .drop-cta {
  width: 100%;
  margin-bottom: 12px;
}

.drop-zone .formats {
  font-size: 0.68rem;
  color: var(--text-muted);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

.upload-status {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 10px 12px;
  border-radius: var(--radius);
  background: var(--bg-elevated);
  border: 1px solid var(--border);
  font-size: 0.78rem;
  color: var(--text-secondary);
  margin-top: 12px;
}

.upload-status.success {
  border-color: rgba(16, 185, 129, 0.35);
  background: rgba(16, 185, 129, 0.06);
  color: var(--accent-green);
}

/* ───────────────────────── Doc list ───────────────────────── */
.section-label {
  text-transform: uppercase;
  font-size: 0.65rem;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  margin: 20px 0 10px;
  font-weight: 600;
}

.doc-list {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.doc-item {
  background: var(--bg-surface);
  border-radius: var(--radius);
  padding: 10px 12px;
  border: 1px solid var(--border);
  display: flex;
  flex-direction: column;
  gap: 6px;
  transition: border-color 0.15s ease;
}

.doc-item:hover {
  border-color: var(--border-strong);
}

.doc-item .filename {
  font-size: 0.78rem;
  font-family: var(--font-mono);
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.doc-item .meta {
  display: flex;
  gap: 6px;
  align-items: center;
  flex-wrap: wrap;
}

.empty-text {
  text-align: center;
  color: var(--text-muted);
  font-size: 0.78rem;
  padding: 18px 8px;
  border: 1px dashed var(--border);
  border-radius: var(--radius);
  background: var(--bg-input);
}

/* ───────────────────────── Chat ───────────────────────── */
.chat-messages {
  display: flex;
  flex-direction: column;
  overflow-y: auto;
  padding: 24px 32px;
  gap: 18px;
  flex: 1;
}

.msg-wrap {
  display: flex;
  flex-direction: column;
  max-width: 78%;
}

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

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

.msg-bubble {
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  line-height: 1.65;
  font-size: 0.9rem;
  white-space: pre-wrap;
  word-break: break-word;
}

.msg-wrap.user .msg-bubble {
  background: var(--accent);
  color: #ffffff;
  border-bottom-right-radius: 4px;
  box-shadow: var(--shadow-sm);
}

.msg-wrap.assistant .msg-bubble {
  background: var(--bg-surface);
  border: 1px solid var(--border);
  color: var(--text-primary);
  border-bottom-left-radius: 4px;
}

.msg-bubble.md p {
  margin: 0 0 8px 0;
}
.msg-bubble.md p:last-child {
  margin-bottom: 0;
}
.msg-bubble.md ul,
.msg-bubble.md ol {
  margin: 4px 0 8px 0;
  padding-left: 22px;
}
.msg-bubble.md ul:last-child,
.msg-bubble.md ol:last-child {
  margin-bottom: 0;
}
.msg-bubble.md li {
  margin: 3px 0;
  line-height: 1.55;
}
.msg-bubble.md li::marker {
  color: var(--text-muted);
}
.msg-bubble.md strong {
  color: var(--text-primary);
  font-weight: 600;
}
.msg-bubble.md code {
  background: rgba(127, 127, 127, 0.15);
  padding: 1px 5px;
  border-radius: 4px;
  font-family: "JetBrains Mono", ui-monospace, monospace;
  font-size: 0.88em;
}

.msg-meta {
  font-size: 0.7rem;
  color: var(--text-muted);
  padding: 2px 4px;
  margin-top: 6px;
  display: flex;
  gap: 10px;
}

.msg-meta .trace-id {
  font-family: var(--font-mono);
  color: var(--text-faint);
}

.thinking {
  display: flex;
  gap: 8px;
  align-items: center;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  padding: 12px 16px;
  border-radius: var(--radius-lg);
  border-bottom-left-radius: 4px;
  align-self: flex-start;
  font-size: 0.85rem;
  color: var(--text-secondary);
}

.dot {
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--accent-violet);
  display: inline-block;
  animation: bounce 1.2s infinite ease-in-out;
}

.dot:nth-child(1) { animation-delay: 0s; }
.dot:nth-child(2) { animation-delay: 0.15s; }
.dot:nth-child(3) { animation-delay: 0.3s; }

@keyframes bounce {
  0%, 100% { transform: translateY(0); opacity: 0.6; }
  50% { transform: translateY(-4px); opacity: 1; }
}

/* Chat input */
.chat-input-bar {
  padding: 14px 20px 18px;
  border-top: 1px solid var(--border);
  display: flex;
  gap: 10px;
  align-items: flex-end;
  background: var(--bg-surface);
}

#chat-input {
  flex: 1;
  background: var(--bg-input);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
  padding: 11px 14px;
  color: var(--text-primary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  resize: none;
  outline: none;
  min-height: 44px;
  max-height: 140px;
  line-height: 1.5;
  transition: all 0.15s ease;
}

#chat-input:focus {
  border-color: var(--accent);
  box-shadow: var(--shadow-focus);
  background: var(--bg-elevated);
}

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

#send-btn {
  flex-shrink: 0;
  height: 44px;
}

/* Sources */
.src-toggle-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text-secondary);
  cursor: pointer;
  font-size: 0.75rem;
  font-family: var(--font-body);
  font-weight: 500;
  margin-top: 10px;
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 6px 10px;
  border-radius: var(--radius-sm);
  transition: all 0.15s ease;
}

.src-toggle-btn:hover {
  color: var(--text-primary);
  border-color: var(--border-focus);
  background: var(--bg-hover);
}

.src-list {
  display: none;
  flex-direction: column;
  gap: 8px;
  margin-top: 10px;
  width: 100%;
}

.src-list.open {
  display: flex;
}

.src-chunk {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 10px 12px;
  border-left: 3px solid var(--accent);
  font-family: var(--font-mono);
  font-size: 0.74rem;
  color: var(--text-secondary);
  overflow: hidden;
  line-height: 1.6;
}

.src-chunk .score {
  color: var(--accent-green);
  font-weight: 600;
}

.src-chunk .src-tag {
  color: var(--accent);
  font-weight: 600;
}

/* ───────────────────────── MCP Trace ───────────────────────── */
.trace-card {
  background: var(--bg-surface);
  border-radius: var(--radius);
  margin-bottom: 8px;
  border: 1px solid var(--border);
  transition: border-color 0.15s ease;
}

.trace-card:hover {
  border-color: var(--border-strong);
}

.trace-header {
  padding: 10px 12px;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  user-select: none;
}

.trace-header .sender,
.trace-header .receiver {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  font-weight: 500;
  color: var(--text-primary);
}

.trace-header .arrow {
  color: var(--text-muted);
  font-size: 0.75rem;
}

.trace-header .ts {
  color: var(--text-muted);
  font-size: 0.7rem;
  margin-left: auto;
  font-family: var(--font-mono);
}

.trace-payload {
  display: none;
  padding: 0 12px 12px;
}

.trace-payload.open {
  display: block;
}

.trace-payload pre {
  background: var(--bg-input);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 10px 12px;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  color: var(--text-secondary);
  overflow-x: auto;
  max-height: 220px;
  overflow-y: auto;
  white-space: pre-wrap;
  word-break: break-all;
  line-height: 1.5;
}

/* ───────────────────────── Empty / Error ───────────────────────── */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  color: var(--text-muted);
  gap: 12px;
  padding: 48px 32px;
  flex: 1;
  margin: auto;
  max-width: 420px;
}

.empty-state .icon {
  font-size: 2.4rem;
  width: 64px;
  height: 64px;
  border-radius: 50%;
  background: var(--bg-surface);
  border: 1px solid var(--border);
  display: grid;
  place-items: center;
}

.empty-state .title {
  font-size: 1.05rem;
  font-weight: 600;
  color: var(--text-primary);
}

.empty-state .subtitle {
  font-size: 0.85rem;
  max-width: 320px;
  line-height: 1.6;
  color: var(--text-secondary);
}

.error-msg {
  color: var(--accent-red);
  font-size: 0.78rem;
  padding: 9px 12px;
  background: rgba(239, 68, 68, 0.06);
  border-radius: var(--radius-sm);
  border: 1px solid rgba(239, 68, 68, 0.3);
  margin-top: 10px;
}

.spinner {
  width: 14px;
  height: 14px;
  border: 2px solid var(--border-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.7s linear infinite;
  display: inline-block;
  flex-shrink: 0;
}

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

/* ───────────────────────── Responsive ───────────────────────── */
@media (max-width: 1100px) {
  #body {
    grid-template-columns: 240px 1fr 280px;
  }
  .chat-messages {
    padding: 20px 20px;
  }
}

/* ── Right panel tabs ────────────────────────────────────────────────────── */
.rtab-nav {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  padding: 0 4px;
}
.rtab-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.rtab-btn:hover { color: var(--text-primary); }
.rtab-btn.active {
  color: var(--accent-violet);
  border-bottom-color: var(--accent-violet);
}

/* ── Source section ──────────────────────────────────────────────────────── */
.src-section {
  margin-top: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.src-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  background: var(--bg-elevated);
  cursor: pointer;
  user-select: none;
  font-size: 11.5px;
  color: var(--text-secondary);
}
.src-section-header:hover { background: var(--bg-hover); color: var(--text-primary); }
.src-label { display: flex; align-items: center; gap: 5px; font-weight: 500; }
.src-chevron { font-size: 10px; transition: transform 0.2s; }
.src-section.open .src-chevron { transform: rotate(180deg); }
.src-cards {
  display: none;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
}
.src-section.open .src-cards { display: flex; }
.src-chunk {
  background: var(--bg-surface);
  padding: 8px 10px;
  font-size: 11px;
  line-height: 1.5;
}
.src-chunk-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 5px;
  gap: 8px;
}
.src-meta { display: flex; align-items: center; gap: 6px; min-width: 0; }
.src-file {
  font-weight: 600;
  color: var(--accent-cyan);
  font-size: 10.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}
.src-loc {
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-elevated);
  padding: 1px 5px;
  border-radius: 3px;
  white-space: nowrap;
}
.src-score-wrap { display: flex; align-items: center; gap: 5px; flex-shrink: 0; }
.src-score-bar {
  width: 44px;
  height: 4px;
  background: var(--border-strong);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}
.src-score-bar::after {
  content: "";
  display: block;
  height: 100%;
  width: var(--pct);
  background: var(--fill);
  border-radius: 2px;
}
.src-score-pct { font-size: 10px; color: var(--text-muted); font-family: var(--font-mono); }
.src-chunk-body { color: var(--text-secondary); font-size: 11px; line-height: 1.55; }

/* ── Evaluate button ─────────────────────────────────────────────────────── */
.eval-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 500;
  color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s;
  margin-left: auto;
}
.eval-btn:hover { background: rgba(245, 158, 11, 0.16); }
.eval-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Evaluation scores card ─────────────────────────────────────────────── */
.eval-card {
  margin-top: 8px;
  padding: 10px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
}
.eval-title {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.eval-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 11.5px;
}
.eval-row:last-child { margin-bottom: 0; }
.eval-label { width: 130px; color: var(--text-secondary); flex-shrink: 0; }
.eval-bar-wrap {
  flex: 1;
  height: 5px;
  background: var(--border-strong);
  border-radius: 3px;
  overflow: hidden;
}
.eval-bar-fill { height: 100%; border-radius: 3px; transition: width 0.4s ease; }
.eval-val {
  width: 34px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  flex-shrink: 0;
}

/* ── Health panel empty state ───────────────────────────────────────────── */
#health-panel .empty-text { padding: 16px; }

/* ── Mobile bottom tab bar (hidden on desktop) ──────────────────────────── */
.mobile-tabbar {
  display: none;
}

/* ───────────────────────── TABLET (≤860px) ─────────────────────────────── */
@media (max-width: 860px) {
  #body {
    grid-template-columns: 1fr;
    grid-template-rows: 1fr;
    height: calc(100vh - 53px - 56px); /* header + tabbar */
  }

  /* Only show the active panel, hide others */
  .panel {
    display: none;
    border: none;
    height: 100%;
    overflow: hidden;
  }
  .panel.mobile-active {
    display: flex;
    flex-direction: column;
  }

  /* Chat main is always the default active */
  main.mobile-active {
    display: flex;
  }
  main {
    display: none;
    border: none;
  }

  /* Mobile bottom navigation tab bar */
  .mobile-tabbar {
    display: flex;
    position: fixed;
    bottom: 0;
    left: 0;
    right: 0;
    height: 56px;
    background: var(--bg-surface);
    border-top: 1px solid var(--border);
    z-index: 100;
  }

  .mobile-tabbar-btn {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 3px;
    font-size: 10px;
    font-weight: 500;
    color: var(--text-muted);
    background: none;
    border: none;
    cursor: pointer;
    transition: color 0.15s;
    padding: 6px 0;
  }
  .mobile-tabbar-btn svg { flex-shrink: 0; }
  .mobile-tabbar-btn.active {
    color: var(--accent-violet);
  }
  .mobile-tabbar-btn.active svg {
    stroke: var(--accent-violet);
  }

  /* App wrapper padding for tab bar */
  #app {
    padding-bottom: 56px;
  }

  /* Header adjustments */
  .header {
    padding: 0 12px;
  }
  .header-brand span {
    display: none;
  }
  #header-stats {
    display: none;
  }

  /* Chat messages */
  .chat-messages {
    padding: 12px 12px;
  }

  /* Input row */
  .input-row {
    padding: 10px 12px;
    gap: 8px;
  }
  #chat-input {
    font-size: 15px; /* prevents iOS zoom on focus */
  }

  /* Bubbles */
  .msg-bubble {
    max-width: 92%;
    font-size: 0.88rem;
  }

  /* Panel headers */
  .panel-header {
    padding: 10px 12px;
    font-size: 12px;
  }

  /* Drop zone */
  .drop-zone {
    padding: 20px 16px;
  }

  /* Upload status */
  .upload-status {
    font-size: 12px;
  }
}

/* ───────────────────────── SMALL MOBILE (≤480px) ───────────────────────── */
@media (max-width: 480px) {
  .header-title {
    font-size: 13px;
  }
  .msg-bubble {
    max-width: 96%;
    font-size: 0.86rem;
    padding: 10px 12px;
  }
  .msg-meta {
    font-size: 0.68rem;
  }
  .send-btn {
    width: 36px;
    height: 36px;
  }
  .eval-label {
    width: 90px;
    font-size: 10px;
  }
}


/* ── Right panel tabs ────────────────────────────────────────────────────── */
.rtab-nav {
  display: flex;
  gap: 2px;
  border-bottom: 1px solid var(--border);
  padding: 0 4px;
}
.rtab-btn {
  display: flex;
  align-items: center;
  gap: 5px;
  padding: 7px 10px;
  font-size: 11.5px;
  font-weight: 500;
  color: var(--text-secondary);
  background: none;
  border: none;
  border-bottom: 2px solid transparent;
  cursor: pointer;
  transition: color 0.15s, border-color 0.15s;
  white-space: nowrap;
}
.rtab-btn:hover { color: var(--text-primary); }
.rtab-btn.active {
  color: var(--accent-violet);
  border-bottom-color: var(--accent-violet);
}

/* ── Source section ──────────────────────────────────────────────────────── */
.src-section {
  margin-top: 6px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}
.src-section-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 7px 10px;
  background: var(--bg-elevated);
  cursor: pointer;
  user-select: none;
  font-size: 11.5px;
  color: var(--text-secondary);
}
.src-section-header:hover { background: var(--bg-hover); color: var(--text-primary); }
.src-label { display: flex; align-items: center; gap: 5px; font-weight: 500; }
.src-chevron { font-size: 10px; transition: transform 0.2s; }
.src-section.open .src-chevron { transform: rotate(180deg); }
.src-cards {
  display: none;
  flex-direction: column;
  gap: 1px;
  background: var(--border);
}
.src-section.open .src-cards { display: flex; }
.src-chunk {
  background: var(--bg-surface);
  padding: 8px 10px;
  font-size: 11px;
  line-height: 1.5;
}
.src-chunk-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 5px;
  gap: 8px;
}
.src-meta { display: flex; align-items: center; gap: 6px; min-width: 0; }
.src-file {
  font-weight: 600;
  color: var(--accent-cyan);
  font-size: 10.5px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  max-width: 140px;
}
.src-loc {
  font-size: 10px;
  color: var(--text-muted);
  background: var(--bg-elevated);
  padding: 1px 5px;
  border-radius: 3px;
  white-space: nowrap;
}
.src-score-wrap { display: flex; align-items: center; gap: 5px; flex-shrink: 0; }
.src-score-bar {
  width: 44px;
  height: 4px;
  background: var(--border-strong);
  border-radius: 2px;
  overflow: hidden;
  position: relative;
}
.src-score-bar::after {
  content: "";
  display: block;
  height: 100%;
  width: var(--pct);
  background: var(--fill);
  border-radius: 2px;
}
.src-score-pct { font-size: 10px; color: var(--text-muted); font-family: var(--font-mono); }
.src-chunk-body { color: var(--text-secondary); font-size: 11px; line-height: 1.55; }

/* ── Evaluate button ─────────────────────────────────────────────────────── */
.eval-btn {
  display: inline-flex;
  align-items: center;
  gap: 4px;
  padding: 3px 8px;
  font-size: 11px;
  font-weight: 500;
  color: var(--accent-amber);
  background: rgba(245, 158, 11, 0.08);
  border: 1px solid rgba(245, 158, 11, 0.25);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background 0.15s;
  margin-left: auto;
}
.eval-btn:hover { background: rgba(245, 158, 11, 0.16); }
.eval-btn:disabled { opacity: 0.5; cursor: not-allowed; }

/* ── Evaluation scores card ─────────────────────────────────────────────── */
.eval-card {
  margin-top: 8px;
  padding: 10px 12px;
  background: var(--bg-elevated);
  border: 1px solid var(--border-strong);
  border-radius: var(--radius);
}
.eval-title {
  font-size: 10.5px;
  font-weight: 600;
  color: var(--text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: 8px;
}
.eval-row {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 6px;
  font-size: 11.5px;
}
.eval-row:last-child { margin-bottom: 0; }
.eval-label { width: 130px; color: var(--text-secondary); flex-shrink: 0; }
.eval-bar-wrap {
  flex: 1;
  height: 5px;
  background: var(--border-strong);
  border-radius: 3px;
  overflow: hidden;
}
.eval-bar-fill { height: 100%; border-radius: 3px; transition: width 0.4s ease; }
.eval-val {
  width: 34px;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  flex-shrink: 0;
}