@tailwind base;
@tailwind components;
@tailwind utilities;

/* Dark mode CSS variables (extracted from index.html) */
[data-theme="dark"] {
  --bg-primary: #0a0e1a;
  --bg-secondary: #111827;
  --bg-card: #1e293b;
  --bg-overlay: rgba(14, 165, 233, 0.12);
  --text-primary: #f1f5f9;
  --text-secondary: #94a3b8;
  --text-muted: #64748b;
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
  --shadow-glow: 0 0 30px rgba(14, 165, 233, 0.3);
}

[data-theme="dark"] body { background: var(--bg-primary); color: var(--text-primary); }
[data-theme="dark"] .bg-primary { background: var(--bg-primary); }
[data-theme="dark"] .bg-secondary { background: var(--bg-secondary); }
[data-theme="dark"] .bg-card { background: var(--bg-card); }
[data-theme="dark"] .bg-overlay { background: var(--bg-overlay); }
[data-theme="dark"] .text-primary { color: var(--text-primary); }
[data-theme="dark"] .text-secondary { color: var(--text-secondary); }
[data-theme="dark"] .text-muted { color: var(--text-muted); }
[data-theme="dark"] .shadow-sm { box-shadow: var(--shadow-sm); }
[data-theme="dark"] .shadow-md { box-shadow: var(--shadow-md); }
[data-theme="dark"] .shadow-lg { box-shadow: var(--shadow-lg); }
[data-theme="dark"] .shadow-glow { box-shadow: var(--shadow-glow); }
[data-theme="dark"] .border-secondary { border-color: var(--bg-secondary); }

/* Onboarding step-dot active state */
.step-dot.active {
  width: 32px;
  background-color: #3b82f6;
}

/* Onboarding step content visibility */
.onboarding-step {
  display: none;
}
.onboarding-step.active {
  display: block;
}

/* Screen visibility */
.screen {
  display: none;
}
.screen.active {
  display: block;
}

/* Button styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 0.5rem;
  padding: 1rem 2rem;
  border-radius: 9999px;
  font-size: 1rem;
  font-weight: 600;
  cursor: pointer;
  border: none;
  transition: all 0.25s ease;
}
.btn-primary {
  background: linear-gradient(135deg, #3b82f6 0%, #06b6d4 100%);
  color: white;
  box-shadow: 0 4px 20px rgba(59, 130, 246, 0.3);
}
.btn-primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 6px 25px rgba(59, 130, 246, 0.4);
}
.btn-secondary {
  background: #e2e8f0;
  color: #0f172a;
}
.btn-secondary:hover {
  background: #cbd5e1;
}

/* Swipe card animations (from scene_swipe.html) */
@keyframes shimmer {
  0% { transform: translateX(-100%) translateY(-100%); }
  100% { transform: translateX(100%) translateY(100%); }
}
@keyframes cardExitLeft {
  to { transform: translateX(-150%) rotate(-15deg); opacity: 0; }
}
@keyframes cardExitRight {
  to { transform: translateX(150%) rotate(15deg); opacity: 0; }
}
@keyframes cardEnter {
  from { transform: scale(0.9) translateY(30px); opacity: 0; }
  to { transform: scale(1) translateY(0); opacity: 1; }
}

.animate-card-enter {
  animation: cardEnter 0.3s ease forwards;
}

/* Fade slide up animation */
@keyframes fadeSlideUp {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Float animation */
@keyframes float {
  0%, 100% { transform: translateY(0); }
  50% { transform: translateY(-10px); }
}

/* Bounce in animation */
@keyframes bounceIn {
  0% { transform: scale(0); }
  50% { transform: scale(1.1); }
  100% { transform: scale(1); }
}

/* Pulse animation */
@keyframes pulse {
  0%, 100% { opacity: 0.5; transform: scale(1); }
  50% { opacity: 1; transform: scale(1.1); }
}

/* Slide in animation */
@keyframes slideIn {
  from { opacity: 0; transform: translateY(30px); }
  to { opacity: 1; transform: translateY(0); }
}

/* Unlock pulse (gamification) */
@keyframes unlockPulse {
  0% { transform: scale(1); box-shadow: 0 0 0 0 rgba(251, 191, 36, 0.4); }
  50% { transform: scale(1.1); box-shadow: 0 0 0 15px rgba(251, 191, 36, 0); }
  100% { transform: scale(1); box-shadow: 0 0 0 0 rgba(251, 191, 36, 0); }
}

/* Sparkle (gamification) */
@keyframes sparkle {
  0%, 100% { opacity: 0; transform: scale(0) rotate(0deg); }
  50% { opacity: 1; transform: scale(1) rotate(180deg); }
}

/* Confetti fall (gamification) */
@keyframes confettiFall {
  0% { transform: translateY(-100%) rotate(0deg); opacity: 1; }
  100% { transform: translateY(100vh) rotate(720deg); opacity: 0; }
}

/* Fire flicker (gamification) */
@keyframes fireFlicker {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

.animate-card-exit-left {
  animation: cardExitLeft 0.3s ease forwards;
}
.animate-card-exit-right {
  animation: cardExitRight 0.3s ease forwards;
}

.card-container {
  overflow: visible;
}
.current-card {
  touch-action: pan-y;
}
.current-card.dragging {
  cursor: grabbing;
  transition: none;
}
.current-card.swiping-left .card-hints span:first-child,
.current-card.swiping-right .card-hints span:last-child {
  opacity: 1;
}

:root {
      /* Blue Light Puzzle Theme - Intelligent, Precise, Cool */
      --primary: #3b82f6;
      --primary-light: #60a5fa;
      --primary-dark: #1d4ed8;
      --secondary: #06b6d4;
      --secondary-light: #22d3ee;
      --accent: #0ea5e9;
      --accent-warn: #38bdf8;
      --accent-danger: #f472b6;

      /* Neutrals */
      --bg-primary: #f8fafc;
      --bg-secondary: #e2e8f0;
      --bg-card: #ffffff;
      --bg-overlay: rgba(14, 165, 233, 0.08);

      /* Text */
      --text-primary: #0f172a;
      --text-secondary: #475569;
      --text-muted: #94a3b8;

      /* Shadows with Blue Glow */
      --shadow-sm: 0 2px 8px rgba(14, 165, 233, 0.06);
      --shadow-md: 0 4px 20px rgba(14, 165, 233, 0.08);
      --shadow-lg: 0 8px 40px rgba(14, 165, 233, 0.12);
      --shadow-glow: 0 0 30px rgba(14, 165, 233, 0.25);
      --shadow-blue: 0 4px 20px rgba(59, 130, 246, 0.3);

      /* Spacing */
      --space-1: 4px;
      --space-2: 8px;
      --space-3: 12px;
      --space-4: 16px;
      --space-5: 20px;
      --space-6: 24px;
      --space-8: 32px;
      --space-10: 40px;
      --space-12: 48px;
      --space-16: 64px;

      /* Border Radius */
      --radius-sm: 8px;
      --radius-md: 12px;
      --radius-lg: 20px;
      --radius-xl: 28px;
      --radius-full: 9999px;

      /* Transitions */
      --transition-fast: 150ms ease;
      --transition-base: 250ms ease;
      --transition-slow: 400ms ease;
      --transition-bounce: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    [data-theme="dark"] {
      --bg-primary: #0a0e1a;
      --bg-secondary: #111827;
      --bg-card: #1e293b;
      --bg-overlay: rgba(14, 165, 233, 0.12);
      --text-primary: #f1f5f9;
      --text-secondary: #94a3b8;
      --text-muted: #64748b;
      --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.4);
      --shadow-md: 0 4px 20px rgba(0, 0, 0, 0.5);
      --shadow-lg: 0 8px 40px rgba(0, 0, 0, 0.6);
      --shadow-glow: 0 0 30px rgba(14, 165, 233, 0.3);
    }

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

    body {
      font-family: 'Noto Sans KR', -apple-system, BlinkMacSystemFont, sans-serif;
      background: var(--bg-primary);
      color: var(--text-primary);
      min-height: 100vh;
      overflow-x: hidden;
      line-height: 1.5;
      -webkit-font-smoothing: antialiased;
    }

    @keyframes fadeInUp {
      0% { opacity: 0; transform: translateY(20px); }
      100% { opacity: 1; transform: translateY(0); }
    }

    @keyframes fadeIn {
      0% { opacity: 0; }
      100% { opacity: 1; }
    }

    .app {
      animation: fadeIn 0.6s ease-out;
    }

    .header {
      animation: fadeInUp 0.5s ease-out;
    }

    .comparison-banner {
      animation: fadeInUp 0.6s ease-out 0.1s both;
    }

    .comparison-container {
      animation: fadeInUp 0.6s ease-out 0.2s both;
    }

    .comparison-panel {
      animation: fadeInUp 0.6s ease-out;
    }

    .comparison-panel:nth-child(2) {
      animation-delay: 0.15s;
    }

    .section {
      animation: fadeInUp 0.6s ease-out 0.3s both;
    }

    .tree-container {
      animation: fadeInUp 0.6s ease-out 0.4s both;
    }

    h1, h2, h3, h4 {
      font-family: 'Outfit', sans-serif;
      font-weight: 600;
    }

    /* Buttons */
    .btn {
      display: inline-flex;
      align-items: center;
      justify-content: center;
      gap: var(--space-2);
      padding: var(--space-4) var(--space-8);
      border-radius: var(--radius-full);
      font-size: 1rem;
      font-weight: 600;
      font-family: 'Outfit', sans-serif;
      cursor: pointer;
      border: none;
      transition: all var(--transition-base);
      min-height: 56px;
      min-width: 160px;
    }

    .btn-primary {
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      color: white;
      box-shadow: var(--shadow-blue);
    }

    .btn-primary:hover {
      transform: translateY(-2px);
      box-shadow: 0 6px 25px rgba(59, 130, 246, 0.4);
    }

    .btn-primary:active {
      transform: translateY(0);
    }

    .btn-secondary {
      background: var(--bg-card);
      color: var(--text-primary);
      box-shadow: var(--shadow-sm);
    }

    .btn-secondary:hover {
      background: var(--bg-secondary);
    }

    .btn-ghost {
      background: transparent;
      color: var(--text-secondary);
      min-width: auto;
      padding: var(--space-3) var(--space-4);
    }

    .btn-icon {
      width: 56px;
      height: 56px;
      padding: 0;
      border-radius: var(--radius-lg);
    }

    .btn svg {
      width: 20px;
      height: 20px;
      stroke: currentColor;
      fill: none;
    }

    .app {
      max-width: 720px;
      margin: 0 auto;
      padding: var(--space-6) var(--space-5) 100px;
    }

    /* Header */
    .header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      padding: var(--space-4) var(--space-6);
      background: var(--bg-card);
      box-shadow: var(--shadow-sm);
      position: sticky;
      top: 0;
      z-index: 100;
    }

    .header-left {
      display: flex;
      align-items: center;
      gap: var(--space-3);
    }

    .header-logo {
      width: 40px;
      height: 40px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      box-shadow: var(--shadow-blue);
      position: relative;
    }

    .header-logo::before {
      content: '';
      position: absolute;
      inset: -2px;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      border-radius: var(--radius-md);
      filter: blur(8px);
      opacity: 0.5;
      z-index: -1;
    }

    .header-logo svg {
      width: 24px;
      height: 24px;
      fill: white;
      filter: drop-shadow(0 1px 2px rgba(0,0,0,0.2));
    }

    .header-title {
      font-family: 'Outfit', sans-serif;
      font-size: 1.25rem;
      font-weight: 600;
    }

    .header-right {
      display: flex;
      align-items: center;
      gap: var(--space-3);
    }

    .back-btn {
      width: 40px;
      height: 40px;
      border-radius: var(--radius-md);
      background: var(--bg-secondary);
      border: none;
      display: flex;
      align-items: center;
      justify-content: center;
      cursor: pointer;
      transition: all var(--transition-base);
      box-shadow: var(--shadow-sm);
    }

    .back-btn:hover {
      background: var(--primary-light);
      color: white;
    }

    .back-btn svg {
      width: 20px;
      height: 20px;
      stroke: currentColor;
    }

    /* Comparison Banner */
    .comparison-banner {
      display: flex;
      align-items: center;
      justify-content: center;
      gap: var(--space-4);
      padding: var(--space-4) var(--space-5);
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.03) 0%, rgba(6, 182, 212, 0.05) 50%, rgba(244, 114, 182, 0.03) 100%);
      border: 1px solid rgba(14, 165, 233, 0.1);
      border-radius: var(--radius-xl);
      margin-bottom: var(--space-7);
      box-shadow: var(--shadow-md), inset 0 1px 0 rgba(255,255,255,0.8);
      position: relative;
      overflow: hidden;
    }

    .comparison-banner::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.4) 50%, transparent 100%);
      transform: translateX(-100%);
      animation: bannerShimmer 3s ease-in-out infinite;
    }

    @keyframes bannerShimmer {
      0%, 100% { transform: translateX(-100%); }
      50% { transform: translateX(100%); }
    }

    .comparison-item {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      padding: var(--space-3) var(--space-5);
      border-radius: var(--radius-lg);
      font-weight: 600;
      font-size: 0.9375rem;
      position: relative;
      z-index: 1;
      transition: all var(--transition-base);
    }

    .comparison-item.current {
      background: linear-gradient(135deg, rgba(244, 114, 182, 0.2) 0%, rgba(244, 114, 182, 0.1) 100%);
      color: #db2777;
      border: 1px solid rgba(244, 114, 182, 0.3);
      box-shadow: 0 2px 10px rgba(244, 114, 182, 0.15), inset 0 1px 0 rgba(255,255,255,0.5);
    }

    .comparison-item.current:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 15px rgba(244, 114, 182, 0.25);
    }

    .comparison-item.proposed {
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.2) 0%, rgba(6, 182, 212, 0.15) 100%);
      color: var(--primary-dark);
      border: 1px solid rgba(14, 165, 233, 0.3);
      box-shadow: 0 2px 10px rgba(14, 165, 233, 0.15), inset 0 1px 0 rgba(255,255,255,0.5);
    }

    .comparison-item.proposed:hover {
      transform: translateY(-2px);
      box-shadow: 0 4px 15px rgba(14, 165, 233, 0.25);
    }

    .comparison-icon {
      width: 32px;
      height: 32px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      background: rgba(255,255,255,0.6);
    }

    .comparison-icon svg {
      width: 18px;
      height: 18px;
      stroke: currentColor;
      fill: none;
    }

    .comparison-arrow {
      color: var(--text-muted);
      font-size: 1.5rem;
      font-weight: 300;
      opacity: 0.6;
      animation: arrowPulse 2s ease-in-out infinite;
    }

    @keyframes arrowPulse {
      0%, 100% { transform: translateX(0); opacity: 0.4; }
      50% { transform: translateX(4px); opacity: 0.8; }
    }

    /* Before/After Comparison Container */
    .comparison-container {
      display: grid;
      grid-template-columns: 1fr 1fr;
      gap: var(--space-6);
      margin-bottom: var(--space-6);
    }

    @media (max-width: 768px) {
      .comparison-container {
        grid-template-columns: 1fr;
      }
    }

    .comparison-panel {
      background: var(--bg-card);
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
      border: 1px solid var(--bg-secondary);
      position: relative;
      transition: all var(--transition-base);
    }

    .comparison-panel:hover {
      transform: translateY(-4px);
      box-shadow: var(--shadow-glow);
    }

    .comparison-panel-header {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      padding: var(--space-5);
      border-bottom: 1px solid var(--bg-secondary);
      position: relative;
    }

    .comparison-panel-header.before {
      background: linear-gradient(135deg, rgba(244, 114, 182, 0.12) 0%, rgba(244, 114, 182, 0.04) 100%);
    }

    .comparison-panel-header.after {
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.12) 0%, rgba(6, 182, 212, 0.06) 100%);
    }

    .comparison-panel-icon {
      width: 44px;
      height: 44px;
      border-radius: var(--radius-lg);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .comparison-panel-icon::after {
      content: '';
      position: absolute;
      inset: -2px;
      border-radius: inherit;
      opacity: 0.3;
      animation: iconPulse 2s ease-in-out infinite;
    }

    @keyframes iconPulse {
      0%, 100% { transform: scale(1); opacity: 0.3; }
      50% { transform: scale(1.1); opacity: 0.1; }
    }

    .comparison-panel-icon.before {
      background: linear-gradient(135deg, #f472b6 0%, #ec4899 100%);
      color: white;
      box-shadow: 0 4px 15px rgba(244, 114, 182, 0.4);
    }

    .comparison-panel-icon.before::after {
      background: rgba(244, 114, 182, 0.3);
    }

    .comparison-panel-icon.after {
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      color: white;
      box-shadow: 0 4px 15px rgba(14, 165, 233, 0.4);
    }

    .comparison-panel-icon.after::after {
      background: rgba(14, 165, 233, 0.3);
    }

    .comparison-panel-icon svg {
      width: 22px;
      height: 22px;
      stroke: currentColor;
      fill: none;
      position: relative;
      z-index: 1;
    }

    .comparison-panel-title {
      font-family: 'Outfit', sans-serif;
      font-size: 1.125rem;
      font-weight: 700;
    }

    .comparison-panel-subtitle {
      font-size: 0.8125rem;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* Before Tree - Messy, Disorganized */
    .before-tree {
      padding: var(--space-5);
      position: relative;
    }

    .messy-folder {
      background: linear-gradient(135deg, rgba(244, 114, 182, 0.08) 0%, rgba(236, 72, 153, 0.04) 100%);
      border-radius: var(--radius-md);
      padding: var(--space-4);
      margin-bottom: var(--space-3);
      opacity: 0.85;
      border: 1px dashed rgba(244, 114, 182, 0.25);
      position: relative;
      overflow: hidden;
      transition: all var(--transition-base);
    }

    .messy-folder::before {
      content: '';
      position: absolute;
      top: 0;
      right: 0;
      width: 60px;
      height: 60px;
      background: radial-gradient(circle at top right, rgba(244, 114, 182, 0.08) 0%, transparent 70%);
    }

    .messy-folder:hover {
      opacity: 1;
      transform: translateX(4px);
      border-style: solid;
    }

    .messy-folder-name {
      font-size: 0.875rem;
      font-weight: 600;
      color: #be185d;
      display: flex;
      align-items: center;
      gap: var(--space-2);
    }

    .messy-folder-name svg {
      width: 18px;
      height: 18px;
      stroke: var(--accent-danger);
      fill: none;
      animation: messyShake 3s ease-in-out infinite;
    }

    @keyframes messyShake {
      0%, 100% { transform: rotate(0deg); }
      25% { transform: rotate(-3deg); }
      75% { transform: rotate(3deg); }
    }

    .messy-files {
      display: flex;
      flex-wrap: wrap;
      gap: var(--space-2);
      margin-top: var(--space-3);
      padding-left: var(--space-6);
      animation: filesScatter 0.5s ease-out;
    }

    @keyframes filesScatter {
      0% { opacity: 0; transform: translateY(-5px); }
      100% { opacity: 1; transform: translateY(0); }
    }

    .messy-file-tag {
      font-size: 0.6875rem;
      padding: var(--space-1) var(--space-2);
      background: linear-gradient(135deg, rgba(244, 114, 182, 0.15) 0%, rgba(236, 72, 153, 0.08) 100%);
      color: #db2777;
      border-radius: var(--radius-sm);
      border: 1px dashed rgba(244, 114, 182, 0.4);
      position: relative;
      transition: all var(--transition-fast);
    }

    .messy-file-tag:hover {
      transform: rotate(-2deg) scale(1.05);
      border-style: solid;
    }

    /* After Tree - Clean, Organized */
    .after-tree {
      padding: var(--space-5);
      position: relative;
    }

    .after-tree::before {
      content: '';
      position: absolute;
      top: 0;
      left: 50%;
      transform: translateX(-50%);
      width: 80%;
      height: 1px;
      background: linear-gradient(90deg, transparent 0%, rgba(14, 165, 233, 0.2) 50%, transparent 100%);
    }

    .clean-folder {
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(6, 182, 212, 0.04) 100%);
      border-radius: var(--radius-md);
      padding: var(--space-4);
      margin-bottom: var(--space-3);
      border: 1px solid rgba(14, 165, 233, 0.12);
      position: relative;
      overflow: hidden;
      transition: all var(--transition-base);
    }

    .clean-folder::before {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      right: 0;
      height: 2px;
      background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 100%);
      transform: scaleX(0);
      transition: transform var(--transition-base);
    }

    .clean-folder:hover {
      border-color: rgba(14, 165, 233, 0.25);
      transform: translateX(4px);
      box-shadow: 0 4px 15px rgba(14, 165, 233, 0.1);
    }

    .clean-folder:hover::before {
      transform: scaleX(1);
    }

    .clean-folder-header {
      display: flex;
      align-items: center;
      gap: var(--space-2);
    }

    .clean-folder-name {
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--primary-dark);
      flex: 1;
      display: flex;
      align-items: center;
      gap: var(--space-2);
    }

    .clean-folder-name svg {
      width: 18px;
      height: 18px;
      stroke: var(--primary);
      fill: none;
    }

    .clean-folder-count {
      font-size: 0.6875rem;
      color: var(--text-muted);
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.1) 0%, rgba(6, 182, 212, 0.08) 100%);
      padding: var(--space-1) var(--space-3);
      border-radius: var(--radius-full);
      border: 1px solid rgba(14, 165, 233, 0.15);
    }

    .clean-subfolders {
      margin-top: var(--space-3);
      padding-left: var(--space-5);
      border-left: 2px solid rgba(14, 165, 233, 0.2);
    }

    .clean-subfolder {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-2) 0;
      font-size: 0.75rem;
      color: var(--text-secondary);
      position: relative;
    }

    .clean-subfolder::before {
      content: '';
      position: absolute;
      left: calc(-1 * var(--space-5) - 8px);
      width: 6px;
      height: 6px;
      border-radius: 50%;
      background: var(--secondary);
      opacity: 0.6;
    }

    .clean-subfolder svg {
      width: 14px;
      height: 14px;
      stroke: var(--primary-light);
      fill: none;
    }

    /* Diff Highlight */
    .diff-indicator {
      display: inline-flex;
      align-items: center;
      gap: var(--space-1);
      font-size: 0.6875rem;
      padding: var(--space-1) var(--space-2);
      border-radius: var(--radius-full);
      margin-left: var(--space-2);
      font-weight: 600;
    }

    .diff-indicator.added {
      background: linear-gradient(135deg, rgba(52, 211, 153, 0.2) 0%, rgba(52, 211, 153, 0.12) 100%);
      color: #10b981;
      border: 1px solid rgba(52, 211, 153, 0.25);
    }

    .diff-indicator.removed {
      background: linear-gradient(135deg, rgba(244, 114, 182, 0.2) 0%, rgba(236, 72, 153, 0.12) 100%);
      color: #ec4899;
      border: 1px solid rgba(244, 114, 182, 0.25);
    }

    .diff-indicator svg {
      width: 10px;
      height: 10px;
      stroke: currentColor;
      fill: none;
    }

    /* Stats Summary */
    .comparison-stats {
      display: flex;
      gap: var(--space-5);
      padding: var(--space-5);
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(6, 182, 212, 0.04) 100%);
      border-top: 1px solid rgba(14, 165, 233, 0.1);
      position: relative;
    }

    .comparison-stats::before {
      content: '';
      position: absolute;
      top: 0;
      left: var(--space-5);
      right: var(--space-5);
      height: 1px;
      background: linear-gradient(90deg, transparent 0%, rgba(14, 165, 233, 0.2) 50%, transparent 100%);
    }

    .comparison-stat {
      display: flex;
      align-items: center;
      gap: var(--space-3);
    }

    .comparison-stat-icon {
      width: 36px;
      height: 36px;
      border-radius: var(--radius-md);
      display: flex;
      align-items: center;
      justify-content: center;
      position: relative;
    }

    .comparison-stat-icon.improved {
      background: linear-gradient(135deg, rgba(52, 211, 153, 0.2) 0%, rgba(52, 211, 153, 0.1) 100%);
      color: #10b981;
      box-shadow: 0 2px 8px rgba(52, 211, 153, 0.2);
    }

    .comparison-stat-icon.optimized {
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.2) 0%, rgba(14, 165, 233, 0.1) 100%);
      color: var(--primary);
      box-shadow: 0 2px 8px rgba(14, 165, 233, 0.2);
    }

    .comparison-stat-icon.removed {
      background: linear-gradient(135deg, rgba(244, 114, 182, 0.2) 0%, rgba(236, 72, 153, 0.1) 100%);
      color: #ec4899;
      box-shadow: 0 2px 8px rgba(244, 114, 182, 0.2);
    }

    .comparison-stat-icon svg {
      width: 18px;
      height: 18px;
      stroke: currentColor;
      fill: none;
    }

    .comparison-stat-value {
      font-family: 'Outfit', sans-serif;
      font-size: 1.5rem;
      font-weight: 700;
      color: var(--text-primary);
      line-height: 1;
    }

    .comparison-stat-label {
      font-size: 0.6875rem;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* Section */
    .section {
      margin-bottom: var(--space-6);
    }

    .section-header {
      display: flex;
      align-items: center;
      justify-content: space-between;
      margin-bottom: var(--space-4);
    }

    .section-title {
      font-family: 'Outfit', sans-serif;
      font-size: 0.875rem;
      font-weight: 600;
      color: var(--text-secondary);
      text-transform: uppercase;
      letter-spacing: 0.8px;
    }

    .section-badge {
      font-size: 0.75rem;
      color: var(--text-muted);
      background: var(--bg-secondary);
      padding: var(--space-1) var(--space-3);
      border-radius: var(--radius-full);
    }

    /* Tree Container */
    .tree-container {
      background: var(--bg-card);
      border: 1px solid var(--bg-secondary);
      border-radius: var(--radius-xl);
      overflow: hidden;
      box-shadow: var(--shadow-lg);
    }

    /* Tree Item */
    .tree-item {
      border-bottom: 1px solid var(--bg-secondary);
      position: relative;
    }

    .tree-item:last-child {
      border-bottom: none;
    }

    .tree-item::after {
      content: '';
      position: absolute;
      left: 0;
      top: 0;
      bottom: 0;
      width: 3px;
      background: linear-gradient(180deg, var(--primary) 0%, var(--secondary) 100%);
      transform: scaleY(0);
      transition: transform var(--transition-base);
    }

    .tree-item:hover::after {
      transform: scaleY(1);
    }

    .tree-item-header {
      display: flex;
      align-items: center;
      padding: var(--space-5);
      gap: var(--space-4);
      cursor: pointer;
      transition: all var(--transition-fast);
    }

    .tree-item-header:hover {
      background: rgba(14, 165, 233, 0.03);
    }

    .tree-item.expanded .tree-item-header {
      background: rgba(14, 165, 233, 0.05);
    }

    /* Category Colors */
    .tree-item[data-category="work"] .folder-icon {
      color: var(--primary);
    }

    .tree-item[data-category="personal"] .folder-icon {
      color: var(--accent);
    }

    .tree-item[data-category="utility"] .folder-icon {
      color: var(--text-muted);
    }

    /* Checkbox */
    .checkbox-wrapper {
      position: relative;
      width: 22px;
      height: 22px;
      flex-shrink: 0;
    }

    .checkbox-input {
      position: absolute;
      opacity: 0;
      width: 100%;
      height: 100%;
      cursor: pointer;
      z-index: 1;
    }

    .checkbox-visual {
      width: 22px;
      height: 22px;
      border: 2px solid var(--text-muted);
      border-radius: var(--radius-sm);
      display: flex;
      align-items: center;
      justify-content: center;
      transition: all var(--transition-bounce);
      background: var(--bg-card);
      position: relative;
      overflow: hidden;
    }

    .checkbox-visual::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, var(--primary) 0%, var(--secondary) 100%);
      opacity: 0;
      transition: opacity var(--transition-fast);
    }

    .checkbox-input:checked + .checkbox-visual {
      border-color: transparent;
    }

    .checkbox-input:checked + .checkbox-visual::before {
      opacity: 1;
    }

    .checkbox-input:checked + .checkbox-visual {
      box-shadow: 0 2px 8px rgba(14, 165, 233, 0.3);
    }

    .checkbox-visual svg {
      width: 14px;
      height: 14px;
      color: white;
      opacity: 0;
      transform: scale(0.5) rotate(-90deg);
      transition: all var(--transition-bounce);
      position: relative;
      z-index: 1;
    }

    .checkbox-input:checked + .checkbox-visual svg {
      opacity: 1;
      transform: scale(1) rotate(0deg);
    }

    .checkbox-input:focus-visible + .checkbox-visual {
      outline: 2px solid var(--primary);
      outline-offset: 2px;
    }

    /* Folder Icon */
    .folder-icon {
      width: 28px;
      height: 28px;
      flex-shrink: 0;
      transition: all var(--transition-base);
      filter: drop-shadow(0 1px 2px rgba(0,0,0,0.1));
    }

    .tree-item:hover .folder-icon {
      transform: scale(1.15) rotate(-3deg);
      filter: drop-shadow(0 2px 4px rgba(0,0,0,0.15));
    }

    .tree-item.expanded .folder-icon {
      transform: scale(1.1);
    }

    /* Folder Name */
    .folder-name {
      flex: 1;
      font-weight: 600;
      font-size: 0.9375rem;
    }

    .folder-meta {
      display: flex;
      align-items: center;
      gap: var(--space-3);
    }

    .file-count {
      font-size: 0.6875rem;
      color: var(--text-muted);
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.08) 0%, rgba(6, 182, 212, 0.05) 100%);
      padding: 2px var(--space-3);
      border-radius: var(--radius-full);
      border: 1px solid rgba(14, 165, 233, 0.1);
    }

    .expand-icon {
      width: 24px;
      height: 24px;
      color: var(--text-muted);
      transition: all var(--transition-base);
      opacity: 0.6;
    }

    .tree-item:hover .expand-icon {
      opacity: 1;
      color: var(--primary);
    }

    .tree-item.expanded .expand-icon {
      transform: rotate(180deg);
      color: var(--primary);
      opacity: 1;
    }

    /* Children Container */
    .tree-children {
      max-height: 0;
      overflow: hidden;
      transition: max-height 0.4s ease;
    }

    .tree-item.expanded .tree-children {
      max-height: 500px;
    }

    .tree-children-inner {
      padding: 0 var(--space-5) var(--space-5) 60px;
    }

    .child-item {
      display: flex;
      align-items: center;
      padding: var(--space-3) var(--space-4);
      gap: var(--space-3);
      border-radius: var(--radius-md);
      cursor: pointer;
      transition: all var(--transition-fast);
      margin-bottom: var(--space-2);
      background: rgba(14, 165, 233, 0.02);
      border: 1px solid transparent;
    }

    .child-item:hover {
      background: rgba(14, 165, 233, 0.06);
      border-color: rgba(14, 165, 233, 0.1);
      transform: translateX(4px);
    }

    .child-item:last-child {
      margin-bottom: 0;
    }

    .child-item .checkbox-wrapper {
      width: 18px;
      height: 18px;
    }

    .child-item .checkbox-visual {
      width: 18px;
      height: 18px;
      border-radius: 5px;
    }

    .child-item .checkbox-visual svg {
      width: 11px;
      height: 11px;
    }

    .child-folder-icon {
      width: 18px;
      height: 18px;
      color: var(--text-secondary);
    }

    .child-folder-name {
      font-size: 0.8125rem;
      color: var(--text-secondary);
    }

    /* Preview Section */
    .preview-container {
      background: var(--bg-card);
      border: 1px solid var(--bg-secondary);
      border-radius: var(--radius-lg);
      overflow: hidden;
      box-shadow: var(--shadow-sm);
    }

    .preview-header {
      display: flex;
      align-items: center;
      gap: var(--space-2);
      padding: var(--space-3) var(--space-4);
      background: var(--bg-secondary);
      border-bottom: 1px solid var(--bg-secondary);
    }

    .preview-header svg {
      width: 18px;
      height: 18px;
      color: var(--text-muted);
    }

    .preview-title {
      font-size: 0.8125rem;
      color: var(--text-secondary);
      font-weight: 500;
    }

    .preview-path {
      font-family: 'Outfit', sans-serif;
      font-size: 0.8125rem;
      color: var(--text-primary);
      margin-left: auto;
    }

    .preview-content {
      padding: var(--space-4);
    }

    .preview-empty {
      text-align: center;
      padding: var(--space-8) var(--space-4);
      color: var(--text-muted);
      font-size: 0.875rem;
    }

    .preview-empty svg {
      width: 40px;
      height: 40px;
      margin-bottom: var(--space-3);
      opacity: 0.5;
    }

    .preview-file {
      display: flex;
      align-items: center;
      gap: var(--space-3);
      padding: var(--space-2) var(--space-3);
      background: var(--bg-secondary);
      border-radius: var(--radius-sm);
      margin-bottom: var(--space-2);
      transition: all var(--transition-fast);
    }

    .preview-file:last-child {
      margin-bottom: 0;
    }

    .preview-file:hover {
      background: var(--bg-overlay);
    }

    .preview-file.applied {
      opacity: 0.5;
      text-decoration: line-through;
    }

    .file-icon {
      width: 20px;
      height: 20px;
      color: var(--text-muted);
    }

    .file-info {
      flex: 1;
    }

    .file-name {
      font-size: 0.8125rem;
      color: var(--text-primary);
      font-weight: 500;
    }

    .file-meta {
      font-size: 0.6875rem;
      color: var(--text-muted);
      margin-top: 2px;
    }

    /* Bottom Action Bar */
    .action-bar {
      position: fixed;
      bottom: 0;
      left: 0;
      right: 0;
      background: linear-gradient(to top, var(--bg-primary) 0%, rgba(248, 250, 252, 0.95) 60%, transparent 100%);
      padding: var(--space-8) var(--space-5) calc(var(--space-8) + env(safe-area-inset-bottom));
      z-index: 100;
      backdrop-filter: blur(10px);
    }

    .action-bar-inner {
      max-width: 720px;
      margin: 0 auto;
    }

    .progress-bar-container {
      margin-bottom: var(--space-4);
    }

    .progress-label {
      display: flex;
      justify-content: space-between;
      font-size: 0.8125rem;
      color: var(--text-secondary);
      margin-bottom: var(--space-3);
      font-weight: 500;
    }

    .progress-bar {
      height: 8px;
      background: linear-gradient(135deg, rgba(14, 165, 233, 0.1) 0%, rgba(6, 182, 212, 0.05) 100%);
      border-radius: var(--radius-full);
      overflow: hidden;
      position: relative;
    }

    .progress-fill {
      height: 100%;
      background: linear-gradient(90deg, var(--primary) 0%, var(--secondary) 50%, var(--accent) 100%);
      border-radius: var(--radius-full);
      transition: width 0.6s cubic-bezier(0.34, 1.56, 0.64, 1);
      position: relative;
      overflow: hidden;
    }

    .progress-fill::after {
      content: '';
      position: absolute;
      top: 0;
      left: 0;
      right: 0;
      bottom: 0;
      background: linear-gradient(90deg, transparent 0%, rgba(255,255,255,0.4) 50%, transparent 100%);
      animation: progressShine 2s ease-in-out infinite;
    }

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

    .apply-btn {
      width: 100%;
      padding: var(--space-5) var(--space-6);
      font-family: 'Outfit', sans-serif;
      font-size: 1.0625rem;
      font-weight: 600;
      color: white;
      background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
      border: none;
      border-radius: var(--radius-full);
      cursor: pointer;
      transition: all var(--transition-base);
      display: flex;
      align-items: center;
      justify-content: center;
      gap: var(--space-3);
      box-shadow: 0 4px 20px rgba(59, 130, 246, 0.35);
      min-height: 60px;
      position: relative;
      overflow: hidden;
    }

    .apply-btn::before {
      content: '';
      position: absolute;
      inset: 0;
      background: linear-gradient(135deg, var(--secondary) 0%, var(--primary) 100%);
      opacity: 0;
      transition: opacity var(--transition-base);
    }

    .apply-btn:hover:not(:disabled)::before {
      opacity: 1;
    }

    .apply-btn:hover:not(:disabled) {
      transform: translateY(-3px);
      box-shadow: 0 8px 30px rgba(59, 130, 246, 0.5);
    }

    .apply-btn:active:not(:disabled) {
      transform: translateY(-1px);
    }

    .apply-btn:disabled {
      background: var(--bg-secondary);
      color: var(--text-muted);
      cursor: not-allowed;
      box-shadow: none;
    }

    .apply-btn svg {
      width: 22px;
      height: 22px;
      position: relative;
      z-index: 1;
      transition: transform var(--transition-bounce);
    }

    .apply-btn:hover:not(:disabled) svg {
      transform: scale(1.1) rotate(5deg);
    }

    .apply-btn .btn-text {
      position: relative;
      z-index: 1;
    }

    .apply-btn .count-badge {
      background: rgba(255, 255, 255, 0.25);
      padding: 4px var(--space-4);
      border-radius: var(--radius-full);
      font-size: 0.875rem;
      position: relative;
      z-index: 1;
    }

    /* Success Animation Overlay */
    .success-overlay {
      position: fixed;
      inset: 0;
      background: linear-gradient(135deg, rgba(15, 23, 42, 0.92) 0%, rgba(30, 41, 59, 0.95) 100%);
      display: flex;
      align-items: center;
      justify-content: center;
      z-index: 200;
      opacity: 0;
      visibility: hidden;
      transition: all 0.4s ease;
      backdrop-filter: blur(8px);
    }

    .success-overlay.visible {
      opacity: 1;
      visibility: visible;
    }

    .success-content {
      text-align: center;
      transform: scale(0.8);
      transition: transform 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
    }

    .success-overlay.visible .success-content {
      transform: scale(1);
    }

    .success-icon {
      width: 100px;
      height: 100px;
      background: linear-gradient(135deg, rgba(52, 211, 153, 0.25) 0%, rgba(16, 185, 129, 0.15) 100%);
      border-radius: 50%;
      display: flex;
      align-items: center;
      justify-content: center;
      margin: 0 auto var(--space-6);
      animation: successPulse 1.5s ease infinite;
      box-shadow: 0 0 40px rgba(52, 211, 153, 0.3);
    }

    @keyframes successPulse {
      0%, 100% { box-shadow: 0 0 0 0 rgba(52, 211, 153, 0.5); transform: scale(1); }
      50% { box-shadow: 0 0 0 25px rgba(52, 211, 153, 0); transform: scale(1.05); }
    }

    .success-icon svg {
      width: 50px;
      height: 50px;
      color: #10b981;
      stroke-width: 2.5;
    }

    .success-title {
      font-family: 'Outfit', sans-serif;
      font-size: 1.75rem;
      font-weight: 700;
      margin-bottom: var(--space-3);
      background: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
    }

    .success-message {
      color: var(--text-secondary);
      font-size: 1rem;
      line-height: 1.6;
    }

    .success-subtitle {
      font-size: 0.875rem;
      color: var(--text-secondary);
    }

    /* Animations */
    @keyframes fadeInUp {
      from {
        opacity: 0;
        transform: translateY(20px);
      }
      to {
        opacity: 1;
        transform: translateY(0);
      }
    }

    .tree-item {
      animation: fadeInUp 0.4s ease backwards;
    }

    .tree-item:nth-child(1) { animation-delay: 0.05s; }
    .tree-item:nth-child(2) { animation-delay: 0.1s; }
    .tree-item:nth-child(3) { animation-delay: 0.15s; }

    @keyframes checkBounce {
      0% { transform: scale(1); }
      50% { transform: scale(1.2); }
      100% { transform: scale(1); }
    }

    .checkbox-input:checked + .checkbox-visual {
      animation: checkBounce 0.3s ease;
    }