/* ============================================================
   Design tokens
   ============================================================ */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }

:root {
  --bg:           #090d13;
  --surface:      #0f1623;
  --surface-2:    #161e2e;
  --surface-3:    #1c2638;
  --border:       #232f45;
  --border-soft:  #1a2438;
  --text:         #e2e8f4;
  --muted:        #627394;
  --accent:       #4f9cf9;
  --accent-glow:  rgba(79, 156, 249, 0.18);
  --green:        #34d399;
  --bacterial:    #f87171;
  --viral:        #60a5fa;
  --warn:         #fbbf24;
  --radius:       10px;
  --radius-sm:    6px;
  --font:         'Inter', system-ui, sans-serif;
  --transition:   0.18s ease;
}

*:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

[hidden] { display: none !important; }

html, body { height: 100%; }

body {
  background: var(--bg);
  color: var(--text);
  font-family: var(--font);
  font-size: 14px;
  line-height: 1.65;
  display: flex;
  flex-direction: column;
  min-height: 100vh;
}

/* ============================================================
   Layout helpers
   ============================================================ */
.container {
  width: 100%;
  max-width: 1140px;
  margin: 0 auto;
  padding: 0 28px;
}

/* ============================================================
   Header
   ============================================================ */
header {
  border-bottom: 1px solid var(--border);
  padding: 18px 0;
  background: rgba(9, 13, 19, 0.92);
  backdrop-filter: blur(12px);
  position: sticky;
  top: 0;
  z-index: 50;
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
}

header h1 {
  font-size: 15px;
  font-weight: 600;
  letter-spacing: -0.01em;
  background: linear-gradient(90deg, #e2e8f4 60%, var(--accent));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
}

.header-sub {
  font-size: 12px;
  color: var(--muted);
  margin-top: 1px;
}

.header-badges { display: flex; gap: 8px; flex-wrap: wrap; }

/* ============================================================
   Badges
   ============================================================ */
.badge {
  font-size: 11px;
  font-weight: 500;
  padding: 3px 9px;
  border-radius: 20px;
  white-space: nowrap;
  letter-spacing: 0.02em;
}
.badge-ready    { background: rgba(52,211,153,.12); color: var(--green);    border: 1px solid rgba(52,211,153,.3); }
.badge-missing  { background: rgba(248,113,113,.12); color: var(--bacterial); border: 1px solid rgba(248,113,113,.3); }
.badge-arch     { background: rgba(79,156,249,.10); color: var(--accent);   border: 1px solid rgba(79,156,249,.25); }
.badge-tf       { background: rgba(251,191,36,.08); color: var(--warn);     border: 1px solid rgba(251,191,36,.2); }
.badge-research { background: rgba(99,102,241,.10); color: #a5b4fc;         border: 1px solid rgba(99,102,241,.25); }

/* ============================================================
   Main
   ============================================================ */
main {
  flex: 1;
  padding: 36px 28px;
  display: flex;
  flex-direction: column;
  gap: 32px;
}

/* ============================================================
   Model Selector Section
   ============================================================ */
.model-selector-section {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.mode-toggle-wrap {
  display: flex;
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 4px;
  width: fit-content;
}

.mode-btn {
  background: none;
  border: none;
  color: var(--muted);
  font-family: var(--font);
  font-size: 13px;
  font-weight: 500;
  padding: 7px 20px;
  border-radius: 4px;
  cursor: pointer;
  transition: all var(--transition);
}

.mode-btn.active {
  background: var(--surface-3);
  color: var(--text);
  box-shadow: 0 1px 3px rgba(0,0,0,.4);
}

.model-cards {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
}

@media (max-width: 640px) { 
  .model-cards { grid-template-columns: 1fr; } 
}

.model-card {
  background: var(--surface);
  border: 1.5px solid var(--border);
  border-radius: var(--radius);
  padding: 18px 20px;
  cursor: pointer;
  transition: border-color var(--transition), box-shadow var(--transition), background var(--transition);
  display: block;
}

.model-card:hover:not(.unavailable) {
  border-color: rgba(79,156,249,.45);
  background: var(--surface-2);
}

.model-card.selected {
  border-color: var(--accent);
  background: var(--surface-2);
  box-shadow: 0 0 0 3px var(--accent-glow);
}

.model-card.unavailable { opacity: 0.55; cursor: not-allowed; }

.model-card-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: 4px;
}

.model-card-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
}

.model-card-detail {
  font-size: 12px;
  color: var(--muted);
  margin-bottom: 14px;
}

.model-stats-row {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 8px;
}

.stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  background: var(--surface-3);
  border-radius: var(--radius-sm);
  padding: 8px 4px;
}

.stat-val {
  font-size: 15px;
  font-weight: 700;
  color: var(--accent);
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
}

.model-card.selected .stat-val { color: var(--green); }

.stat-lbl {
  font-size: 10px;
  color: var(--muted);
  text-align: center;
  margin-top: 2px;
}

.compare-hint {
  font-size: 13px;
  color: var(--muted);
  padding: 10px 14px;
  background: var(--surface-2);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
}

.compare-hint .warn { color: var(--warn); margin-left: 6px; }

/* ============================================================
   Workspace (upload + results)
   ============================================================ */
.workspace {
  display: grid;
  grid-template-columns: 380px 1fr;
  gap: 20px;
  align-items: start;
}

@media (max-width: 820px) { .workspace { grid-template-columns: 1fr; } }

/* ============================================================
   Cards
   ============================================================ */
.card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 24px;
}

.card-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 18px;
}

/* ============================================================
   Drop Zone
   ============================================================ */
.drop-zone {
  border: 1.5px dashed var(--border);
  border-radius: var(--radius-sm);
  height: 240px;
  cursor: pointer;
  transition: border-color var(--transition), background var(--transition);
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}

.drop-zone:hover, .drop-zone.dragover {
  border-color: var(--accent);
  background: var(--accent-glow);
}

#drop-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  color: var(--muted);
  text-align: center;
  padding: 24px;
  pointer-events: none;
  position: relative;
  z-index: 1;
}

#drop-content svg { color: var(--border); }
#drop-content p   { font-size: 14px; color: var(--text); }
#drop-content span { font-size: 13px; }
#drop-content small { font-size: 12px; }

#browse-btn {
  background: transparent;
  border: 1px solid var(--accent);
  color: var(--accent);
  padding: 6px 14px;
  border-radius: var(--radius-sm);
  font-size: 13px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
  margin-top: 4px;
}
#browse-btn:hover { background: var(--accent-glow); }

#preview {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: contain;
  padding: 10px;
}

/* ============================================================
   Predict Button
   ============================================================ */
#predict-btn {
  width: 100%;
  margin-top: 14px;
  padding: 11px;
  background: linear-gradient(135deg, var(--accent), #6366f1);
  color: #fff;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 600;
  cursor: pointer;
  transition: opacity var(--transition), transform var(--transition);
  letter-spacing: 0.01em;
}
#predict-btn:hover:not(:disabled) { opacity: 0.88; transform: translateY(-1px); }
#predict-btn:active:not(:disabled) { transform: translateY(0); }
#predict-btn:disabled { opacity: 0.3; cursor: not-allowed; }

#reset-btn {
  background: transparent;
  border: 1px solid var(--border);
  color: var(--text);
  width: 100%;
  margin-top: 10px;
  padding: 10px;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 14px;
  font-weight: 500;
  cursor: pointer;
  transition: all var(--transition);
}
#reset-btn:hover { background: var(--surface-2); border-color: var(--muted); }

/* ============================================================
   Single Results
   ============================================================ */
#results-placeholder {
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: 220px;
}

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

#model-badge-result {
  font-size: 11px;
  font-weight: 500;
  color: var(--accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}

#prediction-label {
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.03em;
  margin-bottom: 20px;
  padding-bottom: 16px;
  border-bottom: 1px solid var(--border);
}
#prediction-label.bacterial { color: var(--bacterial); }
#prediction-label.viral     { color: var(--viral); }

.confidence-section { display: flex; flex-direction: column; gap: 10px; margin-bottom: 22px; }

.bar-row {
  display: grid;
  grid-template-columns: 72px 1fr 46px;
  align-items: center;
  gap: 10px;
}
.bar-label { font-size: 13px; color: var(--muted); }
.bar-track { height: 6px; background: var(--surface-3); border-radius: 3px; position: relative; }
.bar { height: 100%; border-radius: 3px; width: 0%; transition: width 0.55s cubic-bezier(.4,0,.2,1); position: absolute; left: 0; top: 0; }
.bar-marker-50 { position: absolute; left: 50%; top: -2px; bottom: -2px; width: 2px; background: var(--border); z-index: 2; }
.bar-label-50 { position: absolute; left: 50%; top: 8px; transform: translateX(-50%); font-size: 10px; color: var(--muted); }
#bar-bacterial { background: linear-gradient(90deg, #f87171, #fb923c); }
#bar-viral     { background: linear-gradient(90deg, var(--viral), #818cf8); }
.bar-value { font-size: 13px; font-weight: 600; text-align: right; font-variant-numeric: tabular-nums; }

.image-pair {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 12px;
  margin-bottom: 16px;
}
.image-pair figure { display: flex; flex-direction: column; gap: 6px; }
.image-pair img { width: 100%; border-radius: var(--radius-sm); border: 1px solid var(--border); display: block; }
.image-pair figcaption { font-size: 11px; color: var(--muted); text-align: center; }

@media (max-width: 640px) {
  .image-pair { grid-template-columns: 1fr; }
  .image-pair figure:first-child { display: none; }
}

/* ============================================================
   Compare Mode
   ============================================================ */
#results-compare { display: flex; flex-direction: column; gap: 20px; }

.section-heading {
  font-size: 13px;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.compare-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 16px;
}
@media (max-width: 640px) { 
  .compare-grid { grid-template-columns: 1fr; } 
  .compare-xray-row figure { max-width: 100%; }
}

.compare-card {
  background: var(--surface);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  padding: 20px;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.compare-card.winner { border-color: var(--green); box-shadow: 0 0 0 2px rgba(52,211,153,.15); }

.compare-model-name {
  font-size: 13px;
  font-weight: 600;
  color: var(--text);
  display: flex;
  align-items: center;
  gap: 8px;
}

.winner-tag {
  font-size: 10px;
  font-weight: 600;
  background: rgba(52,211,153,.15);
  color: var(--green);
  border: 1px solid rgba(52,211,153,.3);
  padding: 2px 7px;
  border-radius: 10px;
}

.compare-verdict {
  font-size: 18px;
  font-weight: 700;
  letter-spacing: -0.02em;
}
.compare-verdict.bacterial { color: var(--bacterial); }
.compare-verdict.viral     { color: var(--viral); }

.compare-conf { display: flex; flex-direction: column; gap: 7px; }

.compare-bar-row {
  display: grid;
  grid-template-columns: 64px 1fr 42px;
  align-items: center;
  gap: 8px;
}

.compare-gradcam img { width: 100%; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.compare-gradcam figcaption { font-size: 11px; color: var(--muted); margin-top: 5px; text-align: center; }

.compare-xray-row {
  display: flex;
  justify-content: center;
}
.compare-xray-row figure { max-width: 240px; display: flex; flex-direction: column; gap: 6px; }
.compare-xray-row img { width: 100%; border-radius: var(--radius-sm); border: 1px solid var(--border); }
.compare-xray-row figcaption { font-size: 11px; color: var(--muted); text-align: center; }

/* ============================================================
   Loading / Error
   ============================================================ */
#loading, #compare-loading {
  display: flex;
  flex-direction: column;
  justify-content: center;
  min-height: 200px;
}

.skeleton-container {
  display: flex;
  flex-direction: column;
  gap: 16px;
  width: 100%;
}
.skeleton-label { height: 32px; width: 60%; background: var(--surface-3); border-radius: var(--radius-sm); animation: pulse 1.5s infinite; }
.skeleton-bar { height: 6px; width: 100%; background: var(--surface-3); border-radius: 3px; animation: pulse 1.5s infinite; }
.skeleton-images { display: grid; grid-template-columns: 1fr 1fr; gap: 12px; }
.skeleton-img { height: 180px; background: var(--surface-3); border-radius: var(--radius-sm); animation: pulse 1.5s infinite; }
@keyframes pulse {
  0% { opacity: 0.6; }
  50% { opacity: 1; }
  100% { opacity: 0.6; }
}
.timer-text { font-variant-numeric: tabular-nums; text-align: center; margin-top: 8px; }

.spinner {
  width: 26px;
  height: 26px;
  border: 2px solid var(--border);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.65s linear infinite;
}
@keyframes spin { to { transform: rotate(360deg); } }

#error-box, #compare-error {
  background: rgba(248,113,113,.08);
  border: 1px solid rgba(248,113,113,.25);
  border-radius: var(--radius-sm);
  padding: 13px 16px;
  font-size: 13px;
  color: var(--bacterial);
}

/* ============================================================
   Disclaimer
   ============================================================ */
.disclaimer {
  font-size: 12px;
  color: var(--muted);
  padding-top: 12px;
  border-top: 1px solid var(--border-soft);
  margin-top: 4px;
}

/* ============================================================
   Footer
   ============================================================ */
footer {
  border-top: 1px solid var(--border);
  background: linear-gradient(to bottom, transparent, var(--surface));
  padding: 28px 0;
  margin-top: auto;
}

.footer-inner {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 32px;
}
@media (max-width: 720px) { .footer-inner { grid-template-columns: 1fr; } }

.footer-heading {
  font-size: 11px;
  font-weight: 500;
  color: var(--muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin-bottom: 12px;
}

.specs { width: 100%; border-collapse: collapse; font-size: 12.5px; }
.specs td { padding: 6px 10px; border-bottom: 1px solid var(--border-soft); }
.specs td:first-child { color: var(--muted); width: 120px; }
.specs td:last-child  { color: var(--text); }
.specs tr:last-child td { border-bottom: none; }