:root {
  --bg: #0e0e10;
  --panel: #141416;
  --panel-2: #101113;
  --text: #eceff3;
  --muted: #a9afb7;
  --brand: #e0e3e8; /* neutralized */
  --brand-2: #c9cdd3; /* neutralized */
  --danger: #ff6a6a;
  --success: #5bd39d;
  --border: #2a2a2e;

  /* Extended tokens */
  --bg-elevated: #121214;
  --panel-3: #0e0f12;
  --brand-start: #e0e3e8; /* neutralized */
  --brand-end: #c9cdd3; /* neutralized */
  --border-soft: rgba(255, 255, 255, 0.08);
  --ring: rgba(255, 255, 255, 0.35);
  --surface-glass: rgba(16, 16, 20, 0.6);
  --shadow-1: 0 8px 24px rgba(0, 0, 0, 0.45), inset 0 1px 0 rgba(255, 255, 255, 0.02);
  --shadow-2: 0 10px 30px rgba(0, 0, 0, 0.35);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 16px;
  --radius-xl: 20px;
  --space-1: 4px;
  --space-2: 8px;
  --space-3: 12px;
  --space-4: 16px;
  --space-5: 20px;
  --space-6: 24px;
}

* { box-sizing: border-box; }

html, body {
  min-height: 100%;
}

body {
  margin: 0;
  font-family: "Open Sans", system-ui, -apple-system, Segoe UI, Roboto, Arial, Helvetica, sans-serif;
  background: linear-gradient(180deg, #0e0e10 0%, #0a0a0c 100%);
  color: var(--text);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-rendering: optimizeLegibility;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  -webkit-text-size-adjust: 100%; /* prevent iOS zoom on inputs */
  text-size-adjust: 100%;
  overscroll-behavior: none; /* avoid rubber band */
}

::selection { background: rgba(255, 255, 255, 0.15); color: #fff; }

.container {
  width: 100%;
  max-width: 1100px;
  margin: 0 auto;
  padding: 0 16px;
}

.site-header {
  padding: 28px 0 8px;
  border-bottom: 1px solid var(--border-soft);
}

.site-header h1 {
  margin: 0 0 6px 0;
  font-size: 28px;
  letter-spacing: 0.2px;
  color: #ffffff;
}

.site-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 16px;
}

.site-logo img {
  display: block;
  height: 96px;
  width: auto;
  filter: none; /* SVG already white */
  /* Optimal SVG anti-aliasing settings */
  image-rendering: auto; /* Let browser optimize */
  shape-rendering: geometricPrecision; /* Fallback for older browsers */
}

.site-header, .tagline {
  text-align: center;
  margin: 0;
  color: var(--muted);
}

.workspace-section { 
  margin-top: 16px; 
  position: relative;
  min-height: 400px;
}

.workspace-section.dragover .upload-message {
  border-color: var(--border); 
  background: linear-gradient(180deg, rgba(18, 22, 28, 0.6) 0%, rgba(14, 18, 24, 0.6) 100%);
  -webkit-backdrop-filter: blur(12px);
  backdrop-filter: blur(12px);
}

.upload-message {
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px dashed var(--border);
  border-radius: var(--radius-lg);
  padding: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: border-color 0.25s ease, background 0.25s ease, box-shadow 0.25s ease;
  min-height: 160px;
  box-shadow: var(--shadow-1);
}
.upload-message:hover { border-color: var(--border); }

.upload-message:focus { outline: none; border-color: var(--border); }

.upload-content { display: flex; flex-direction: column; align-items: center; text-align: center; gap: 12px; }
.drop-icon { font-size: 32px; letter-spacing: 5px; }
.hint { color: var(--muted); margin-top: 8px; }

.btn {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  cursor: pointer;
  min-height: 44px; /* iOS recommended touch target */
  min-width: 44px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-size: 14px;
  font-weight: 500;
  text-decoration: none;
  box-sizing: border-box;
  transition: transform 0.12s ease, box-shadow 0.2s ease, border-color 0.2s ease, background 0.2s ease, filter 0.2s ease;
  /* Mobile touch improvements */
  -webkit-tap-highlight-color: rgba(255, 255, 255, 0.15);
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.btn:hover { border-color: var(--border); box-shadow: none; filter: brightness(1.03); }
.btn:active { transform: translateY(1px); filter: brightness(0.98); }

.btn:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px rgba(11, 11, 13, 0.75), 0 0 0 4px var(--ring), 0 10px 30px rgba(0, 0, 0, 0.25);
  border-color: transparent;
}

.btn:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  box-shadow: none;
}
/* Button variants */
.btn-secondary {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-secondary:hover { border-color: var(--border); filter: brightness(1.03); }

.btn-primary {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
}
.btn-primary:hover { filter: brightness(1.03); }
.btn-primary:active { transform: translateY(1px); }

/* CTA button: invert colors (fill like border/text; text like bg) */
.btn-cta {
  background: #eaeef5;
  color: #0b0f14;
  border: 1px solid #eaeef5;
}
.btn-cta:hover { filter: brightness(1.02); }

/* Spinner alignment inside CTA */
.btn-cta i.bx { font-size: 18px; }
.btn-icon {
  background: var(--panel);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  width: 44px; /* Increased for better touch target */
  height: 44px;
  padding: 0;
  font-size: 18px; /* default icon size */
  line-height: 1;
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  box-sizing: border-box;
  /* Mobile touch improvements */
  -webkit-tap-highlight-color: rgba(255, 255, 255, 0.15);
  -webkit-touch-callout: none;
  -webkit-user-select: none;
  user-select: none;
  touch-action: manipulation;
}

.btn-icon i { font-size: 20px; line-height: 1; }

.btn-icon:hover:not(:disabled) { border-color: var(--border); background: #1a1b1e; box-shadow: none; filter: brightness(1.03); }
.btn-icon:focus-visible { outline: none; box-shadow: 0 0 0 2px rgba(11, 15, 20, 0.75), 0 0 0 4px var(--ring); }

.btn-icon:disabled {
  opacity: 0.5;
  cursor: default;
  border-color: var(--border);
}

.btn-remove {
  position: absolute;
  top: 8px;
  right: 8px;
  background: rgba(255, 106, 106, 0.9);
  color: white;
  border: 1px solid #ff6a6a;
  width: 32px;
  height: 32px;
  font-size: 16px;
}

.btn-remove:hover {
  background: #ff6a6a;
  filter: brightness(1.1);
}

.hidden { display: none !important; }

/* Keep file input present for iOS while visually hidden */
#fileInput, #referenceInput {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.canvas-area { margin-top: 20px; }
.section-heading { display:flex; align-items: baseline; gap:8px; }
.section-heading .muted { color: var(--muted); }

.canvas-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 10px;
  padding-bottom: 8px;
  border-bottom: 1px solid var(--border-soft);
}

.controls { display: flex; align-items: center; justify-content: flex-end; gap: 12px; }
.toolbar-instructions { margin-bottom: 10px; }

.canvas-wrapper {
  position: relative;
  width: 100%;
  max-width: 90vw;
  max-height: 60vh;
  background: linear-gradient(180deg, var(--panel-2) 0%, var(--panel-3) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  overflow: hidden;
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
  box-shadow: var(--shadow-1);
}

/* Center canvas and make action rows match canvas width */
.canvas-area { display: flex; flex-direction: column; align-items: center; }
.canvas-area .action-row { width: 100%; max-width: 90vw; }

/* Center the canvases inside the wrapper */
.canvas-stage {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center; /* vertical center */
  justify-content: center; /* horizontal center */
}

#imageCanvas {
  display: block;
  width: 100%;
  height: auto;
}

.action-row {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 16px;
  margin-top: 16px;
}

.action-row-left {
  display: flex;
  align-items: center;
  gap: 16px;
}

.action-row-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.action-row .btn {
  min-width: 140px;
  text-align: center;
}

.status { color: var(--muted); }

/* Hairstyle Options Styling */
.hairstyle-options {
  margin-top: 20px;
  background: linear-gradient(180deg, var(--panel) 0%, var(--panel-2) 100%);
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  padding: 20px;
  box-shadow: var(--shadow-1);
}

.option-tabs {
  display: flex;
  gap: 4px;
  margin-bottom: 20px;
  background: var(--panel-3);
  border-radius: var(--radius-sm);
  padding: 4px;
}

.tab-btn {
  flex: 1;
  background: transparent;
  color: var(--muted);
  border: none;
  border-radius: var(--radius-sm);
  padding: 12px 16px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s ease;
  -webkit-tap-highlight-color: rgba(255, 255, 255, 0.15);
}

.tab-btn:hover {
  background: rgba(255, 255, 255, 0.05);
  color: var(--text);
}

.tab-btn.active {
  background: var(--panel);
  color: var(--text);
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
}

.option-panel {
  display: none;
}

.option-panel.active {
  display: block;
}

.hairstyle-prompt-label {
  display: block;
  font-size: 14px;
  font-weight: 600;
  color: var(--text);
  margin-bottom: 8px;
}

.hairstyle-prompt-input {
  width: 100%;
  background: var(--panel-3);
  color: var(--text);
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  padding: 12px 14px;
  font-size: 14px;
  transition: border-color 0.2s ease, box-shadow 0.2s ease;
}

.hairstyle-prompt-input:focus {
  outline: none;
  border-color: var(--border);
  box-shadow: 0 0 0 2px rgba(255, 255, 255, 0.15);
}

.hairstyle-prompt-hint {
  display: block;
  color: var(--muted);
  font-size: 12px;
  margin-top: 6px;
  line-height: 1.4;
}

.reference-upload {
  margin-bottom: 16px;
}

.reference-upload-buttons {
  display: flex;
  gap: 12px;
  justify-content: center;
}

.reference-upload-buttons .btn {
  flex: 0 0 auto;
  min-width: 180px;
  max-width: 200px;
  text-align: center;
}

.reference-hint {
  color: var(--muted);
  font-size: 12px;
  text-align: center;
  margin-top: 8px;
}

.reference-preview {
  position: relative;
  max-width: 200px;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border);
}

.reference-preview img {
  width: 100%;
  height: auto;
  display: block;
}

/* Simplified single-column layout */
main.container {
  display: flex;
  flex-direction: column;
  gap: 24px;
  margin-bottom: 100px;
}

.canvas-area .action-row {
  margin-top: 20px;
}

/* Add touch-friendly spacing for mobile */
@media (max-width: 979px) {
  .btn {
    padding: 14px 18px;
    font-size: 16px; /* Larger text on mobile */
    white-space: nowrap; /* prevent wrapping */
  }
  
  .controls {
    gap: 16px;
  }
  
  .action-row { gap: 12px; margin-top: 16px; flex-direction: column; align-items: stretch; }
  .action-row-left, .action-row-right { width: 100%; }
  .action-row-left .btn, .action-row-right .btn { width: 100%; justify-content: center; min-width: auto; }
  /* Submit status block smaller and above action buttons */
  #submitStatus { width: 100%; font-size: 12px; line-height: 1.3; margin: 4px 0 8px 0; text-align: left; }
  
  .canvas-toolbar {
    gap: 8px;
    margin-bottom: 12px;
    flex-direction: column;
    align-items: stretch;
  }
  .toolbar-instructions { text-align: left; }
  .controls { justify-content: flex-end; }

  .reference-upload-buttons {
    flex-direction: column;
    gap: 8px;
  }

  .reference-upload-buttons .btn {
    flex: 1;
    min-width: auto;
    max-width: none;
    width: 100%;
  }
}

/* Desktop keep action rows same width as canvas column */
@media (min-width: 980px) {
  .canvas-area { align-items: stretch; }
  .canvas-area .action-row { width: 100%; max-width: none; }
}

/* Desktop layout - keep single column but with better spacing */
@media (min-width: 980px) {
  main.container {
    gap: 32px;
  }
}

/* Example Showcase */
.example-showcase {
  margin-top: 40px;
  padding: var(--space-6);
  border-radius: var(--radius-lg);
  background: var(--panel-2);
  border: 1px solid var(--border-soft);
  text-align: center;
}

.example-content {
  max-width: 600px;
  margin: 0 auto;
}

.example-showcase h3 {
  margin: 0 0 var(--space-4) 0;
  color: var(--text);
  font-size: 20px;
  font-weight: 600;
}

.example-image-container {
  margin: var(--space-4) 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.example-image {
  width: 100%;
  height: auto;
  display: block;
}

.example-description {
  color: var(--muted);
  font-size: 14px;
  margin: var(--space-4) 0 0 0;
  line-height: 1.5;
}

.site-footer {
  margin-top: auto;
  border-top: 1px solid var(--border-soft);
  padding: 20px 0 40px;
  color: var(--muted);
  text-align: center;
}

@media (min-width: 900px) {
  .site-header h1 { font-size: 32px; }
}

/* Processing Overlay */
.processing-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: rgba(0, 0, 0, 0.3);
  z-index: 10000;
  display: flex;
  align-items: center;
  justify-content: center;
}

.processing-overlay.hidden {
  display: none;
}

.processing-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-5);
  background: var(--panel);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  box-shadow: var(--shadow-2);
}

.processing-spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--border);
  border-top: 3px solid var(--text);
  border-radius: 50%;
  animation: spin 1s linear infinite;
}

.processing-text {
  color: var(--text);
  font-size: 16px;
  font-weight: 600;
}

@keyframes spin {
  0% { transform: rotate(0deg); }
  100% { transform: rotate(360deg); }
}