/* ─── Reset & Base ─────────────────────────────────────────────────────────── */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg-base:      #141f3d;
  --bg-panel:     rgba(12, 21, 38, 0.65);
  --bg-panel-alt: rgba(15, 26, 46, 0.65);
  --bg-elevated:  rgba(22, 32, 53, 0.75);
  --dot-color:    rgba(255, 255, 255, 0.06);
  --bg-hover:     rgba(28, 40, 64, 0.8);
  --border:       rgba(255,255,255,0.06);
  --border-lit:   rgba(255,255,255,0.11);

  --accent:       #3b82f6;
  --accent-glow:  rgba(59,130,246,0.18);
  --accent-hover: #60a5fa;
  --accent-dim:   rgba(59,130,246,0.12);

  --teal:         #14b8a6;
  --teal-dim:     rgba(20,184,166,0.12);
  --teal-mid:     rgba(20,184,166,0.3);

  --purple:       #a855f7;
  --purple-dim:   rgba(168,85,247,0.12);
  --purple-mid:   rgba(168,85,247,0.3);

  --amber:        #f59e0b;
  --amber-dim:    rgba(245,158,11,0.12);
  --amber-mid:    rgba(245,158,11,0.3);

  --rose:         #f43f5e;
  --rose-dim:     rgba(244,63,94,0.12);
  --rose-mid:     rgba(244,63,94,0.3);

  --emerald:      #10b981;
  --text-primary:   #ebedf5;
  --text-secondary: #8a93a8;
  --text-dim:       #3e4860;
  --header-h: 56px;
  --left-w:   272px;
  --right-w:  420px;
  --radius:   12px;
  --radius-sm:8px;
  --radius-xs:6px;
html { height: 100%; background-color: var(--bg-base); }
body { height: 100%; background-color: var(--bg-base); color: var(--text-primary); font-family: 'Inter', system-ui, sans-serif; font-size: 13.5px; line-height: 1.55; overflow: hidden; position: relative; }

.ambient-orb {
  position: absolute; border-radius: 50%; filter: blur(140px); opacity: 0.20;
  z-index: 1; pointer-events: none;
}
body.light-theme .ambient-orb { opacity: 0.15; }

.orb-1 { top: -10%; left: -10%; width: 55vw; height: 55vw; background: var(--accent); animation: float-orb 22s ease-in-out infinite alternate; }
.orb-2 { bottom: -20%; right: -10%; width: 45vw; height: 45vw; background: var(--teal); animation: float-orb-alt 28s ease-in-out infinite alternate; }

@keyframes float-orb { 0% { transform: translate(0, 0) scale(1); } 100% { transform: translate(25vw, 20vh) scale(1.4); } }
@keyframes float-orb-alt { 0% { transform: translate(0, 0) scale(1); } 100% { transform: translate(-20vw, -25vh) scale(1.2); } }

::-webkit-scrollbar { width: 4px; }
::-webkit-scrollbar-track { background: transparent; }
::-webkit-scrollbar-thumb { background: rgba(255,255,255,0.08); border-radius: 99px; }

/* ─── Header ───────────────────────────────────────────────────────────────── */
.app-header {
  position: fixed; top: 0; left: 0; right: 0;
  height: var(--header-h);
  background: rgba(8,13,26,0.96);
  backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--border);
  display: grid; grid-template-columns: 1fr auto 1fr;
  align-items: center; padding: 0 20px; z-index: 100;
}
.header-brand { display: flex; align-items: center; gap: 10px; }
.brand-icon {
  width: 32px; height: 32px;
  background: linear-gradient(135deg, var(--accent), var(--teal));
  border-radius: var(--radius-sm);
  display: flex; align-items: center; justify-content: center; flex-shrink: 0;
}
.brand-icon svg { width: 16px; height: 16px; stroke: white; }
.brand-text { display: flex; flex-direction: column; }
.brand-title { font-size: 14px; font-weight: 700; letter-spacing: -0.3px; }
.brand-sub   { font-size: 10.5px; color: var(--text-secondary); }
.header-center { display: flex; justify-content: center; }
.header-pipeline-tag {
  display: flex; align-items: center; gap: 7px;
  font-size: 11px; color: var(--text-secondary);
  padding: 5px 14px;
  background: var(--bg-elevated); border: 1px solid var(--border-lit); border-radius: 99px;
}
.dot-pulse {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--teal); box-shadow: 0 0 6px var(--teal);
  animation: pulse-glow 2s infinite;
}
@keyframes pulse-glow { 0%,100% { opacity:1; box-shadow:0 0 6px var(--teal); } 50% { opacity:.5; box-shadow:0 0 2px var(--teal); } }
.header-badge {
  justify-self: end;
  display: flex; align-items: center; gap: 7px;
  font-size: 11px; color: var(--text-secondary);
  padding: 5px 12px;
  background: var(--bg-elevated); border: 1px solid var(--border-lit); border-radius: 99px;
}
.badge-dot { width: 6px; height: 6px; border-radius: 50%; background: var(--accent); box-shadow: 0 0 5px var(--accent); }

/* ─── Layout ───────────────────────────────────────────────────────────────── */
.app-layout {
  position: relative;
  z-index: 10;
  display: grid; grid-template-columns: var(--left-w) 1fr var(--right-w);
  gap: 15px; padding: 15px;
  height: calc(100vh - var(--header-h)); margin-top: var(--header-h);
}
.panel { display: flex; flex-direction: column; background: var(--bg-panel); backdrop-filter: blur(15px); -webkit-backdrop-filter: blur(15px); border: 1px solid var(--border); border-radius: var(--radius); overflow: hidden; box-shadow: 0 4px 15px rgba(0,0,0,0.15); }
.panel-right  { background: var(--bg-panel-alt); }
.panel-centre { background: #06101c; }
.panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 12px 16px; border-bottom: 1px solid var(--border); flex-shrink: 0;
  background: rgba(0,0,0,0.12);
}
.panel-header h2 { font-size: 11px; font-weight: 700; letter-spacing: 0.8px; text-transform: uppercase; color: var(--text-secondary); }
.panel-header-hint { font-size: 10.5px; color: var(--text-dim); }

/* ─── Subject Cards ─────────────────────────────────────────────────────────── */
.subject-list { padding: 10px; display: flex; flex-direction: column; gap: 6px; overflow-y: auto; flex-shrink: 0; }
.subject-card {
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: var(--radius); padding: 11px 13px; cursor: pointer;
  transition: all 0.18s ease; display: flex; align-items: center; gap: 10px;
  position: relative; overflow: hidden;
}
.subject-card::before { content:''; position:absolute; left:0; top:0; bottom:0; width:2px; background:transparent; transition: background .18s; }
.subject-card:hover { border-color: var(--border-lit); transform: translateX(2px); }
.subject-card:hover::before { background: var(--accent); }
.subject-card.active { border-color: rgba(59,130,246,.4); background: var(--accent-dim); box-shadow: 0 2px 16px var(--accent-glow); }
.subject-card.active::before { background: var(--accent); }
.card-rank {
  width: 26px; height: 26px; border-radius: 50%;
  background: var(--bg-base); border: 1px solid var(--border-lit);
  display: flex; align-items: center; justify-content: center;
  font-size: 10px; font-weight: 700; color: var(--text-dim); flex-shrink: 0;
}
.subject-card.active .card-rank { border-color: var(--accent); color: var(--accent-hover); }
.card-body { flex: 1; min-width: 0; }
.card-pid  { font-size: 11.5px; font-weight: 600; color: var(--text-primary); white-space: nowrap; overflow: hidden; text-overflow: ellipsis; font-family: 'JetBrains Mono', monospace; }
.card-meta { font-size: 10.5px; color: var(--text-secondary); margin-top: 2px; }
.card-accuracy { font-size: 14px; font-weight: 800; color: var(--teal); flex-shrink: 0; }

/* ─── Stats Panel ─────────────────────────────────────────────────────────── */
.stats-panel { flex: 1; padding: 14px; overflow-y: auto; border-top: 1px solid var(--border); display: flex; flex-direction: column; gap: 14px; }
.stats-header { display: flex; align-items: flex-start; justify-content: space-between; }
.stats-pid { font-size: 11px; font-weight: 700; color: var(--text-primary); font-family: 'JetBrains Mono', monospace; }
.stats-pid-sub { font-size: 10px; color: var(--text-dim); margin-top: 2px; }
.stats-accuracy-badge { font-size: 13px; font-weight: 800; padding: 4px 11px; border-radius: 99px; background: var(--teal-dim); color: var(--teal); border: 1px solid var(--teal-mid); }
.stats-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 7px; }
.stat-card { background: var(--bg-base); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 9px 11px; text-align: center; position: relative; overflow: hidden; }
.stat-card::after { content:''; position:absolute; bottom:0; left:0; right:0; height:2px; border-radius:0 0 var(--radius-sm) var(--radius-sm); }
.stat-total::after { background: var(--accent); }
.stat-ncr::after   { background: var(--rose); }
.stat-ed::after    { background: var(--amber); }
.stat-et::after    { background: var(--teal); }
.stat-label { font-size: 9.5px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .8px; margin-bottom: 4px; }
.stat-value { font-size: 20px; font-weight: 800; color: var(--text-primary); line-height: 1; }
.stat-unit  { font-size: 9.5px; color: var(--text-secondary); margin-top: 3px; }
.stats-meta { display: flex; flex-direction: column; }
.meta-row { display: flex; align-items: center; justify-content: space-between; padding: 7px 0; border-bottom: 1px solid var(--border); }
.meta-row:last-child { border-bottom: none; }
.meta-label { font-size: 11px; color: var(--text-secondary); }
.meta-val   { font-size: 11.5px; font-weight: 600; color: var(--text-primary); }
.val-ok   { color: var(--emerald); }
.val-warn { color: var(--rose); }

/* ─── Seg Legend ─────────────────────────────────────────────────────────── */
.seg-legend { display: flex; flex-direction: column; gap: 6px; padding: 10px 0; border-top: 1px solid var(--border); }
.legend-row { display: flex; align-items: center; gap: 8px; }
.legend-dot {
  width: 10px; height: 10px; border-radius: 3px; flex-shrink: 0;
}
.legend-dot.ncr { background: rgba(220,55,55,0.85); }
.legend-dot.ed  { background: rgba(240,190,40,0.85); }
.legend-dot.et  { background: rgba(40,185,220,0.85); }
.legend-label { font-size: 10.5px; color: var(--text-secondary); }

/* ─── MRI Viewer Panel — scrollable 3-section layout ──────────────────────── */
.panel-centre { background: #06101c; overflow: hidden; }

.centre-header { flex-shrink: 0; }

.centre-scroll {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  display: flex;
  flex-direction: column;
  gap: 0;
}

.viewer-placeholder-full {
  flex: 1;
  display: flex; flex-direction: column;
  align-items: center; justify-content: center;
  gap: 14px; padding: 30px; text-align: center; color: var(--text-dim);
}
.viewer-placeholder-icon { opacity: .25; }
.viewer-placeholder-icon svg { width: 58px; height: 58px; }
.viewer-placeholder-full p { font-size: 12px; }

/* ─── Viewer sections ─────────────────────────────────────────────────────── */
.viewer-section {
  border-bottom: 1px solid var(--border);
  padding: 10px 12px;
}
.viewer-section:last-child { border-bottom: none; }

.section-row-title {
  display: flex; align-items: center; justify-content: space-between;
  margin-bottom: 8px;
}
.sr-label {
  font-size: 9.5px; font-weight: 700;
  text-transform: uppercase; letter-spacing: 1.1px;
  color: var(--text-dim);
}
.sr-hint {
  font-size: 10px; color: var(--teal);
  font-family: 'JetBrains Mono', monospace;
  letter-spacing: 0.3px;
}
.sr-source { font-size: 9px; color: var(--text-dim); font-weight: 400; letter-spacing: 0; margin-left: 4px; }

.nifti-controls { display: flex; align-items: center; gap: 10px; }

/* Seg toggle button */
.seg-toggle-btn {
  display: flex; align-items: center; gap: 5px;
  font-size: 9.5px; font-weight: 700; letter-spacing: 0.8px;
  padding: 3px 10px; border-radius: 99px;
  border: 1px solid var(--border); background: var(--bg-elevated);
  color: var(--text-secondary); cursor: pointer;
  transition: all .18s; white-space: nowrap;
}
.seg-dot {
  width: 6px; height: 6px; border-radius: 50%;
  background: var(--text-dim); flex-shrink: 0;
  transition: background .18s;
}
.seg-toggle-btn.seg-on  {
  border-color: var(--teal-mid); color: var(--teal); background: var(--teal-dim);
}
.seg-toggle-btn.seg-on .seg-dot {
  background: var(--teal); box-shadow: 0 0 5px var(--teal);
}
.seg-toggle-btn.seg-off { color: var(--text-dim); }
.seg-toggle-btn:hover   { opacity: .85; }


/* ─── 3-column image grid ─────────────────────────────────────────────────── */
.img-grid-3 {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 8px;
}
.img-grid-1 { display: grid; grid-template-columns: 1fr; gap: 8px; }
.img-grid-2 { display: grid; grid-template-columns: 1fr 1fr; gap: 10px; }

/* ─── Co-registered Brain 2-panel viewer ──────────────────────────────────── */
.reg-panel {
  display: flex; flex-direction: column;
  background: #040a12;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  overflow: hidden;
}

.reg-panel-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 8px 12px 6px;
  border-bottom: 1px solid var(--border);
  background: rgba(0,0,0,.25);
}
.reg-panel-title {
  font-size: 11px; font-weight: 600; color: var(--text-primary);
  letter-spacing: 0.2px;
}
.reg-badge {
  font-size: 9px; font-weight: 600; letter-spacing: 0.5px;
  padding: 2px 8px; border-radius: 99px; border: 1px solid;
}
.reg-badge-blue  { color: #60a5fa; border-color: rgba(96,165,250,.3); background: rgba(96,165,250,.08); }
.reg-badge-green { color: #4ade80; border-color: rgba(74,222,128,.3); background: rgba(74,222,128,.08); }

.reg-viewer-box {
  flex: 1; position: relative;
  display: flex; align-items: center; justify-content: center;
  background: #000; min-height: 180px;
  cursor: crosshair;
}
.reg-slice-img {
  max-width: 100%; max-height: 260px;
  object-fit: contain; display: block;
}
.reg-slice-label {
  position: absolute; bottom: 6px; left: 50%; transform: translateX(-50%);
  font-size: 10px; font-family: 'JetBrains Mono', monospace;
  color: rgba(255,255,255,.55);
  background: rgba(0,0,0,.55); padding: 2px 10px;
  border-radius: 99px; white-space: nowrap;
  pointer-events: none;
}

.reg-slider-row {
  display: flex; align-items: center; gap: 6px;
  padding: 6px 10px 8px;
  border-top: 1px solid var(--border);
  background: rgba(0,0,0,.2);
}


.img-cell {
  position: relative;
  background: #04090f;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  display: flex; flex-direction: column;
}
.img-cell-wide { max-height: 220px; }

.grid-img {
  width: 100%;
  flex: 1;
  object-fit: contain;
  display: block;
  min-height: 100px;
}

.img-cell-label {
  font-size: 9.5px; font-weight: 600;
  color: var(--text-dim);
  text-transform: uppercase; letter-spacing: 0.8px;
  padding: 4px 8px;
  background: rgba(0,0,0,0.4);
  text-align: center;
  border-top: 1px solid var(--border);
  flex-shrink: 0;
}

/* ─── NIfTI interactive cells ─────────────────────────────────────────────── */
.nifti-cell {
  position: relative;
  cursor: crosshair;
  border: 2px solid var(--border);
  border-radius: var(--radius-sm);
  overflow: hidden;
  background: #04090f;
  transition: border-color .18s;
  display: flex; flex-direction: column;
}
.nifti-cell:hover { border-color: rgba(20,184,166,0.35); }
.nifti-cell.active {
  border-color: var(--teal);
  box-shadow: 0 0 12px rgba(20,184,166,0.2), inset 0 0 0 1px rgba(20,184,166,0.15);
}

.nifti-img { width:100%; flex:1; object-fit:contain; min-height:120px; display:block; }

.nifti-cell-label {
  position: absolute; top: 6px; left: 8px;
  font-size: 9px; font-weight: 800;
  color: var(--teal); letter-spacing: 1.2px;
  background: rgba(0,0,0,0.65); padding: 2px 7px;
  border-radius: 4px;
  border: 1px solid rgba(20,184,166,0.3);
}
.nifti-cell.active .nifti-cell-label { background: var(--teal); color: #04090f; }

.nifti-cell-overlay {
  position: absolute; bottom: 28px; left: 0; right: 0;
  text-align: center;
  font-size: 9px; color: rgba(255,255,255,0.3);
  opacity: 0;
  transition: opacity .2s;
  pointer-events: none;
}
.nifti-cell:hover .nifti-cell-overlay { opacity: 1; }

/* ─── Slice Slider ─────────────────────────────────────────────────────────── */
.slice-slider-bar {
  display: flex; align-items: center; gap: 8px;
  padding: 6px 0 2px;
}
.slice-step-btn {
  width: 24px; height: 24px; border-radius: var(--radius-xs);
  border: 1px solid var(--border); background: var(--bg-elevated);
  color: var(--text-secondary); cursor: pointer;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; transition: all .13s;
}
.slice-step-btn svg { width: 13px; height: 13px; }
.slice-step-btn:hover { border-color: var(--teal-mid); color: var(--teal); }
.slider-wrap { flex: 1; }
.slice-slider {
  width: 100%; height: 4px;
  -webkit-appearance: none; appearance: none;
  background: var(--border-lit); border-radius: 99px;
  cursor: pointer; accent-color: var(--teal); outline: none;
}
.slice-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  width: 14px; height: 14px; border-radius: 50%;
  background: var(--teal); border: 2px solid #06101c;
  box-shadow: 0 0 6px rgba(20,184,166,.5); cursor: grab;
}
.slice-slider::-webkit-slider-thumb:active { cursor: grabbing; transform: scale(1.2); }
.scroll-hint { font-size: 9.5px; color: var(--text-dim); white-space: nowrap; flex-shrink: 0; }


/* ─── RIGHT: Report ──────────────────────────────────────────────────────── */
.right-placeholder { flex: 1; display: flex; flex-direction: column; align-items: center; justify-content: center; gap: 16px; padding: 30px; text-align: center; color: var(--text-dim); }
.right-placeholder svg { width: 52px; height: 52px; opacity: .2; }
.right-placeholder p { font-size: 12.5px; line-height: 1.7; }

.report-section { flex-shrink: 0; display: flex; flex-direction: column; border-bottom: 1px solid var(--border); max-height: 46%; overflow: hidden; }
.report-header {
  display: flex; align-items: center; justify-content: space-between;
  padding: 11px 16px 9px; border-bottom: 1px solid var(--border); flex-shrink: 0;
  background: rgba(0,0,0,.15);
}
.report-pid { font-size: 10.5px; font-weight: 700; font-family: 'JetBrains Mono', monospace; color: var(--accent-hover); letter-spacing: .4px; }
.report-tag { font-size: 10px; color: var(--text-dim); text-transform: uppercase; letter-spacing: .6px; }

.report-body { flex: 1; overflow-y: auto; padding: 12px 16px; display: flex; flex-direction: column; }
.report-block { padding: 10px 0; border-bottom: 1px solid var(--border); }
.report-block:last-child { border-bottom: none; }

.section-label {
  display: flex; align-items: center; gap: 8px;
  font-size: 9.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 1.4px;
  margin-bottom: 7px;
}
.section-dot { width: 7px; height: 7px; border-radius: 50%; flex-shrink: 0; }
.morphology-label   { color: var(--rose);   }
.morphology-label .section-dot   { background: var(--rose);   box-shadow: 0 0 5px var(--rose); }
.anatomy-label      { color: var(--accent); }
.anatomy-label .section-dot      { background: var(--accent); box-shadow: 0 0 5px var(--accent); }
.correlation-label  { color: var(--teal);   }
.correlation-label .section-dot  { background: var(--teal);   box-shadow: 0 0 5px var(--teal); }

.section-text { font-size: 12px; line-height: 1.7; color: var(--text-secondary); }
.section-text p { margin: 0 0 5px; } .section-text p:last-child { margin-bottom: 0; }
.section-text strong { color: var(--text-primary); }
.section-skeleton {
  height: 48px; border-radius: 6px;
  background: linear-gradient(90deg, var(--bg-elevated), var(--bg-hover), var(--bg-elevated));
  background-size: 300% 100%; animation: shimmer 1.8s infinite;
}
@keyframes shimmer { 0% { background-position:100% 50%; } 100% { background-position:0% 50%; } }

/* ─── Q&A ───────────────────────────────────────────────────────────────── */
.qa-divider {
  display: flex; align-items: center; gap: 10px;
  padding: 8px 16px; flex-shrink: 0; border-bottom: 1px solid var(--border);
}
.qa-divider span { font-size: 9.5px; font-weight: 700; text-transform: uppercase; letter-spacing: 1px; color: var(--text-dim); }
.qa-divider::before,.qa-divider::after { content:''; flex:1; height:1px; background:var(--border); }

.chat-window { flex: 1; overflow-y: auto; padding: 12px 14px; min-height: 0; }
.chat-messages { display: flex; flex-direction: column; gap: 10px; }

.chat-bubble { display: flex; gap: 9px; animation: slide-in .22s ease; }
@keyframes slide-in { from { opacity:0; transform:translateY(5px); } to { opacity:1; transform:translateY(0); } }
.bubble-icon {
  width: 26px; height: 26px; border-radius: 50%;
  display: flex; align-items: center; justify-content: center;
  flex-shrink: 0; margin-top: 16px;
}
.bubble-icon svg { width: 12px; height: 12px; }
.user-icon { border: 1px solid; }
.ai-icon { background: linear-gradient(135deg, #2563eb, var(--teal)); }
.bubble-content { flex: 1; min-width: 0; }
.bubble-meta { font-size: 9.5px; color: var(--text-dim); margin-bottom: 4px; font-weight: 600; text-transform: uppercase; letter-spacing: .6px; }
.ai-meta { display: flex; align-items: center; gap: 6px; }
.ai-badge { font-size: 9px; font-weight: 700; padding: 1px 7px; border-radius: 99px; background: var(--accent-dim); color: var(--accent-hover); border: 1px solid rgba(59,130,246,.3); letter-spacing: .5px; }
.bubble-text {
  font-size: 12px; line-height: 1.7; color: var(--text-secondary);
  background: var(--bg-elevated); border: 1px solid var(--border);
  border-radius: 4px var(--radius) var(--radius) var(--radius);
  padding: 9px 13px;
}
.bubble-text.user { color: var(--text-primary); font-weight: 500; }
.bubble-text.ai-text { background: var(--bg-panel); }
.bubble-text.ai-text strong { color: var(--text-primary); }
.thinking-bubble { display: flex; align-items: center; gap: 12px; }
.thinking-label { font-size: 11px; color: var(--text-dim); font-style: italic; }
.typing-indicator { display: flex; gap: 4px; align-items: center; }
.typing-dot { width: 5px; height: 5px; border-radius: 50%; background: var(--accent); animation: typing-bounce 1.4s infinite; }
.typing-dot:nth-child(2) { animation-delay: .2s; }
.typing-dot:nth-child(3) { animation-delay: .4s; }
@keyframes typing-bounce { 0%,80%,100% { transform:scale(.7); opacity:.4; } 40% { transform:scale(1.1); opacity:1; } }

.qa-controls { flex-shrink: 0; padding: 10px 14px; border-top: 1px solid var(--border); background: rgba(0,0,0,.12); }
.category-prompt,.question-prompt { font-size: 10.5px; color: var(--text-dim); margin-bottom: 7px; font-weight: 500; text-transform: uppercase; letter-spacing: .5px; }
.category-btns { display: grid; grid-template-columns: 1fr 1fr; gap: 5px; }
.cat-btn {
  display: flex; align-items: center; gap: 6px;
  padding: 8px 11px; border-radius: var(--radius-sm);
  border: 1px solid var(--border); background: var(--bg-elevated);
  color: var(--text-primary); font-size: 11.5px; font-weight: 500;
  cursor: pointer; transition: all .15s;
}
.cat-btn svg { width: 13px; height: 13px; opacity: .6; flex-shrink: 0; }
.cat-btn:hover { transform: translateY(-1px); }
.cat-volume:hover    { border-color:var(--teal-mid);   background:var(--teal-dim);   color:var(--teal); }
.cat-region:hover    { border-color:var(--purple-mid); background:var(--purple-dim); color:var(--purple); }
.cat-morphology:hover{ border-color:var(--amber-mid);  background:var(--amber-dim);  color:var(--amber); }
.cat-clinical:hover  { border-color:var(--rose-mid);   background:var(--rose-dim);   color:var(--rose); }

.question-menu { display: flex; flex-direction: column; gap: 5px; animation: fade-in .18s ease; }
@keyframes fade-in { from { opacity:0; } to { opacity:1; } }
.back-btn {
  display: flex; align-items: center; gap: 5px;
  padding: 5px 9px; border-radius: var(--radius-xs);
  border: 1px solid var(--border); background: transparent;
  color: var(--text-secondary); font-size: 10.5px; cursor: pointer;
  width: fit-content; transition: all .15s; margin-bottom: 2px;
}
.back-btn svg { width: 11px; height: 11px; }
.back-btn:hover { color: var(--text-primary); border-color: var(--border-lit); }
.question-btns { display: flex; flex-direction: column; gap: 3px; }
.q-btn {
  text-align: left; padding: 7px 11px; border-radius: var(--radius-xs);
  border: 1px solid var(--border); background: var(--bg-elevated);
  color: var(--text-secondary); font-size: 11.5px; cursor: pointer;
  transition: all .13s; width: 100%;
}
.q-btn:hover { border-color: var(--accent); background: var(--accent-dim); color: var(--text-primary); }
.q-btn.asked { opacity: .4; }

/* ─── Utilities ──────────────────────────────────────────────────────────── */
.loading-placeholder { display: flex; flex-direction: column; align-items: center; gap: 10px; padding: 30px; color: var(--text-dim); font-size: 12.5px; }
.spinner { width: 22px; height: 22px; border: 2px solid var(--border-lit); border-top-color: var(--accent); border-radius: 50%; animation: spin .7s linear infinite; }
@keyframes spin { to { transform:rotate(360deg); } }
.hidden { display: none !important; }

/* ─── Stats Panel — Pipeline Animation ──────────────────────────────────── */

/* 1. Scanning shimmer on stat cards while pipeline is "computing" */
@keyframes stat-shimmer {
  0%   { background-position: 200% 0; }
  100% { background-position: -200% 0; }
}
.stat-scanning {
  background: linear-gradient(
    90deg,
    var(--bg-base) 0%,
    var(--bg-elevated) 40%,
    var(--border-lit) 50%,
    var(--bg-elevated) 60%,
    var(--bg-base) 100%
  );
  background-size: 300% 100%;
  animation: stat-shimmer 1.4s ease infinite;
}
.stat-scanning .stat-value { color: var(--text-dim) !important; }

/* 2. Flash-pop when a value lands */
@keyframes stat-pop-kf {
  0%   { transform: scale(1);    box-shadow: 0 0 0px transparent; }
  30%  { transform: scale(1.04); box-shadow: 0 0 14px rgba(20,184,166,0.35); }
  100% { transform: scale(1);    box-shadow: none; }
}
.stat-pop { animation: stat-pop-kf 0.4s ease forwards; }

/* 3. Meta row fade + slide in */
@keyframes meta-row-in {
  from { opacity: 0; transform: translateX(10px); }
  to   { opacity: 1; transform: translateX(0); }
}
.meta-anim { animation: meta-row-in 0.3s ease forwards; }

/* 4. Legend row fade in */
@keyframes legend-row-in {
  from { opacity: 0; transform: translateX(8px); }
  to   { opacity: 1; transform: translateX(0); }
}
.legend-row { opacity: 0; }
.legend-row.legend-anim { animation: legend-row-in 0.28s ease forwards; }

/* 5. Accuracy badge pulse while computing */
@keyframes badge-pulse-kf {
  0%,100% { box-shadow: 0 0 0px transparent; }
  50%     { box-shadow: 0 0 10px rgba(20,184,166,0.55); }
}
.badge-pulse { animation: badge-pulse-kf 0.9s ease infinite; }

/* ─── Light Theme Overrides ────────────────────────────────────────────────── */
body.light-theme {
  --bg-base:      #b8c9f7;
  --bg-panel:     rgba(255, 255, 255, 0.75);
  --bg-panel-alt: rgba(248, 250, 252, 0.85);
  --bg-elevated:  rgba(255, 255, 255, 0.9);
  --dot-color:    rgba(0, 0, 0, 0.05);
  --bg-hover:     rgba(241, 245, 249, 0.9);
  --border:       rgba(0,0,0,0.08);
  --border-lit:   rgba(0,0,0,0.15);

  --accent:       #2563eb;
  --accent-glow:  rgba(37,99,235,0.15);
  --accent-hover: #1d4ed8;
  --accent-dim:   rgba(37,99,235,0.1);

  --teal:         #0f766e;
  --teal-dim:     rgba(15,118,110,0.12);
  --teal-mid:     rgba(15,118,110,0.25);

  --purple:       #7e22ce;
  --purple-dim:   rgba(126,34,206,0.12);
  --purple-mid:   rgba(126,34,206,0.25);

  --amber:        #d97706;
  --amber-dim:    rgba(217,119,6,0.12);
  --amber-mid:    rgba(217,119,6,0.25);

  --rose:         #e11d48;
  --rose-dim:     rgba(225,29,72,0.12);
  --rose-mid:     rgba(225,29,72,0.25);

  --emerald:      #059669;

  --text-primary:   #1e293b;
  --text-secondary: #475569;
  --text-dim:       #94a3b8;
}

body.light-theme .app-header {
  background: rgba(255,255,255,0.96);
}

body.light-theme .header-pipeline-tag {
  background-color: rgba(241,245,249,0.9) !important;
  border-color: rgba(0,0,0,0.08) !important;
  color: #475569 !important;
}

body.light-theme #theme-toggle {
  background: #f8fafc;
  color: #1e293b;
}

/* Decorative, extremely subtle creator signature designed to look like a UI element */
.creator-sig {
  position: fixed;
  bottom: 80px; /* Start slightly higher so it doesn't clip */
  left: 12px;
  font-size: 9px;
  color: rgba(255, 255, 255, 0.08); /* Fainter */
  filter: blur(0.8px); /* Blurs the text slightly */
  transform: rotate(-90deg);
  transform-origin: left bottom;
  pointer-events: none;
  z-index: 9999;
  user-select: none;
  letter-spacing: 28px; /* Greatly spread out */
  font-family: 'JetBrains Mono', monospace;
  text-transform: uppercase;
  white-space: nowrap;
}

body.light-theme .creator-sig {
  color: rgba(0, 0, 0, 0.04);
}