:root {
  --bg-primary: #0c0c14;
  --bg-secondary: #141420;
  --bg-card: rgba(255, 255, 255, 0.04);
  --bg-card-hover: rgba(255, 255, 255, 0.08);
  --bg-glass: rgba(255, 255, 255, 0.05);
  --border-glass: rgba(255, 255, 255, 0.08);
  --border-glass-strong: rgba(255, 255, 255, 0.15);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.65);
  --text-tertiary: rgba(255, 255, 255, 0.4);
  --accent: #7c3aed;
  --accent-hover: #6d28d9;
  --accent-light: rgba(124, 58, 237, 0.15);
  --accent-glow: rgba(124, 58, 237, 0.3);
  --danger: #ef4444;
  --success: #10b981;
  --overlay: rgba(0, 0, 0, 0.7);
  --navbar-bg: rgba(12, 12, 20, 0.8);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.3);
  --radius-sm: 8px;
  --radius-md: 12px;
  --radius-lg: 20px;
  --radius-xl: 24px;
  --font: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', system-ui, sans-serif;
  --transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  --transition-fast: 0.15s ease;
}

[data-theme="light"] {
  --bg-primary: #f5f5f8;
  --bg-secondary: #e8e8ee;
  --bg-card: rgba(0, 0, 0, 0.03);
  --bg-card-hover: rgba(0, 0, 0, 0.06);
  --bg-glass: rgba(255, 255, 255, 0.7);
  --border-glass: rgba(0, 0, 0, 0.08);
  --border-glass-strong: rgba(0, 0, 0, 0.15);
  --text-primary: #1a1a2e;
  --text-secondary: rgba(26, 26, 46, 0.65);
  --text-tertiary: rgba(26, 26, 46, 0.4);
  --accent-light: rgba(124, 58, 237, 0.1);
  --overlay: rgba(0, 0, 0, 0.5);
  --navbar-bg: rgba(245, 245, 248, 0.85);
  --shadow: 0 8px 32px rgba(0, 0, 0, 0.1);
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
}

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

html {
  scroll-behavior: smooth;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

body {
  font-family: var(--font);
  background: var(--bg-primary);
  color: var(--text-primary);
  min-height: 100vh;
  line-height: 1.6;
  transition: background var(--transition), color var(--transition);
}

::selection {
  background: var(--accent);
  color: white;
}

::-webkit-scrollbar {
  width: 6px;
}

::-webkit-scrollbar-track {
  background: transparent;
}

::-webkit-scrollbar-thumb {
  background: var(--text-tertiary);
  border-radius: 3px;
}

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.glass {
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow);
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 100;
  background: var(--navbar-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border-bottom: 1px solid var(--border-glass);
  padding: 0 24px;
  height: 64px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background var(--transition);
}

.navbar-brand {
  display: flex;
  align-items: center;
  gap: 10px;
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: -0.02em;
  color: var(--text-primary);
  text-decoration: none;
}

.navbar-logo {
  width: 32px;
  height: 32px;
  border-radius: 6px;
  object-fit: cover;
}

[data-theme="dark"] .navbar-logo {
  filter: brightness(0) invert(1);
}

.navbar-brand .accent {
  color: var(--accent);
}

.navbar-actions {
  display: flex;
  align-items: center;
  gap: 8px;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
  padding: 10px 20px;
  border: none;
  border-radius: var(--radius-sm);
  font-family: var(--font);
  font-size: 0.875rem;
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
  line-height: 1;
}

.btn:disabled {
  opacity: 0.4;
  cursor: not-allowed;
}

.btn-primary {
  background: var(--accent);
  color: white;
  box-shadow: 0 0 20px var(--accent-glow);
}

.btn-primary:hover:not(:disabled) {
  background: var(--accent-hover);
  box-shadow: 0 0 30px var(--accent-glow);
  transform: translateY(-1px);
}

.btn-secondary {
  background: var(--bg-glass);
  color: var(--text-primary);
  border: 1px solid var(--border-glass-strong);
}

.btn-secondary:hover:not(:disabled) {
  background: var(--bg-card-hover);
  border-color: var(--accent);
}

.btn-ghost {
  background: transparent;
  color: var(--text-secondary);
  padding: 8px 12px;
}

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

.btn-icon {
  width: 40px;
  height: 40px;
  padding: 0;
  border-radius: 50%;
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid var(--border-glass);
  cursor: pointer;
  transition: all var(--transition-fast);
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

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

.btn-group {
  display: flex;
  gap: 8px;
  flex-wrap: wrap;
}

.btn-sm {
  padding: 6px 14px;
  font-size: 0.8rem;
}

.hero {
  min-height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 80px 24px 40px;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(ellipse at 30% 40%, rgba(124, 58, 237, 0.08) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 60%, rgba(124, 58, 237, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.hero-content {
  position: relative;
  text-align: center;
  max-width: 600px;
  width: 100%;
  padding: 48px 40px;
}

[data-theme="light"] .hero::before {
  background: radial-gradient(ellipse at 30% 40%, rgba(124, 58, 237, 0.06) 0%, transparent 60%),
              radial-gradient(ellipse at 70% 60%, rgba(124, 58, 237, 0.04) 0%, transparent 50%);
}

.hero-badge {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 6px 16px;
  background: var(--accent-light);
  border: 1px solid rgba(124, 58, 237, 0.2);
  border-radius: 100px;
  font-size: 0.8rem;
  color: var(--accent);
  font-weight: 500;
  margin-bottom: 20px;
}

.hero h1 {
  font-size: clamp(2.2rem, 5vw, 3.5rem);
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.15;
  margin-bottom: 16px;
}

.hero h1 .gradient {
  background: linear-gradient(135deg, var(--accent), #a78bfa);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.hero p {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 32px;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}

.upload-zone {
  position: relative;
  cursor: pointer;
}

.upload-area {
  border: 2px dashed var(--border-glass-strong);
  border-radius: var(--radius-md);
  padding: 36px 24px;
  transition: all var(--transition);
  background: var(--bg-card);
}

.upload-zone:hover .upload-area,
.upload-zone.drag-over .upload-area {
  border-color: var(--accent);
  background: var(--accent-light);
}

.upload-icon {
  width: 48px;
  height: 48px;
  margin: 0 auto 16px;
  color: var(--text-tertiary);
  transition: color var(--transition);
}

.upload-zone:hover .upload-icon,
.upload-zone.drag-over .upload-icon {
  color: var(--accent);
}

.upload-area p {
  font-weight: 600;
  margin-bottom: 4px;
  color: var(--text-primary);
}

.upload-area span {
  font-size: 0.8rem;
  color: var(--text-tertiary);
}

.editor {
  min-height: 100vh;
  padding: 80px 24px 24px;
  display: flex;
  flex-direction: column;
}

.editor-layout {
  display: grid;
  grid-template-columns: 1fr 360px;
  gap: 20px;
  flex: 1;
  max-width: 1400px;
  width: 100%;
  margin: 0 auto;
  min-height: 0;
}

.preview-panel {
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-height: 400px;
}

.preview-toolbar {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-glass);
  flex-shrink: 0;
  flex-wrap: wrap;
}

.color-presets {
  display: flex;
  gap: 6px;
  align-items: center;
}

.color-swatch {
  width: 28px;
  height: 28px;
  border-radius: 50%;
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  flex-shrink: 0;
}

.color-swatch:hover {
  transform: scale(1.15);
}

.color-swatch.active {
  border-color: var(--text-primary);
  box-shadow: 0 0 0 2px var(--accent);
}

.color-picker-wrapper {
  position: relative;
  width: 28px;
  height: 28px;
  border-radius: 50%;
  overflow: hidden;
  border: 2px solid var(--border-glass-strong);
  cursor: pointer;
  flex-shrink: 0;
}

.color-picker-wrapper input[type="color"] {
  position: absolute;
  top: -4px;
  left: -4px;
  width: calc(100% + 8px);
  height: calc(100% + 8px);
  border: none;
  padding: 0;
  cursor: pointer;
}

.toolbar-divider {
  width: 1px;
  height: 24px;
  background: var(--border-glass-strong);
  flex-shrink: 0;
}

.canvas-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  background-image:
    linear-gradient(45deg, var(--bg-secondary) 25%, transparent 25%),
    linear-gradient(-45deg, var(--bg-secondary) 25%, transparent 25%),
    linear-gradient(45deg, transparent 75%, var(--bg-secondary) 75%),
    linear-gradient(-45deg, transparent 75%, var(--bg-secondary) 75%);
  background-size: 20px 20px;
  background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}

.canvas-container canvas {
  max-width: 100%;
  max-height: 100%;
  object-fit: contain;
  display: block;
}

.compare-handle {
  position: absolute;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--text-primary);
  cursor: ew-resize;
  z-index: 10;
  pointer-events: none;
}

.compare-handle::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 32px;
  border-radius: 50%;
  background: var(--text-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.3);
}

.compare-handle::after {
  content: '⟷';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  color: var(--bg-primary);
  font-size: 14px;
  font-weight: bold;
  line-height: 1;
}

.controls-panel {
  display: flex;
  flex-direction: column;
  gap: 16px;
  padding: 20px;
  overflow-y: auto;
  max-height: calc(100vh - 120px);
}

.controls-panel .btn {
  width: 100%;
}

.section-label {
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  color: var(--text-tertiary);
  font-weight: 600;
  margin-bottom: 8px;
}

.color-picker-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
}

.download-section {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.info-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px;
  padding: 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
  font-size: 0.8rem;
}

.info-grid dt {
  color: var(--text-tertiary);
  font-size: 0.7rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.info-grid dd {
  color: var(--text-secondary);
  font-weight: 500;
  word-break: break-all;
}

.progress-section {
  display: none;
  flex-direction: column;
  gap: 8px;
}

.progress-section.active {
  display: flex;
}

.progress-bar {
  width: 100%;
  height: 4px;
  background: var(--bg-card);
  border-radius: 2px;
  overflow: hidden;
}

.progress-fill {
  height: 100%;
  background: linear-gradient(90deg, var(--accent), #a78bfa);
  border-radius: 2px;
  transition: width 0.3s ease;
  width: 0%;
}

.progress-text {
  display: flex;
  justify-content: space-between;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.empty-state {
  text-align: center;
  padding: 40px 20px;
  color: var(--text-tertiary);
}

.empty-state svg {
  width: 64px;
  height: 64px;
  margin-bottom: 16px;
  opacity: 0.5;
}

.empty-state h3 {
  font-size: 1.1rem;
  color: var(--text-secondary);
  margin-bottom: 8px;
}

.overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: var(--overlay);
  backdrop-filter: blur(4px);
  -webkit-backdrop-filter: blur(4px);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.overlay-content {
  text-align: center;
  padding: 40px;
  min-width: 300px;
}

.spinner {
  width: 48px;
  height: 48px;
  border: 3px solid var(--border-glass-strong);
  border-top-color: var(--accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
  margin: 0 auto 20px;
}

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

.overlay-content h3 {
  margin-bottom: 8px;
}

.overlay-content p {
  color: var(--text-secondary);
  font-size: 0.9rem;
  margin-bottom: 16px;
}

.overlay-content .progress-bar {
  max-width: 300px;
  margin: 0 auto;
}

.toast {
  position: fixed;
  bottom: 24px;
  right: 24px;
  padding: 12px 20px;
  background: var(--bg-glass);
  backdrop-filter: blur(16px);
  -webkit-backdrop-filter: blur(16px);
  border: 1px solid var(--border-glass-strong);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow);
  z-index: 300;
  font-size: 0.875rem;
  animation: slideUp 0.3s ease;
  display: flex;
  align-items: center;
  gap: 8px;
}

.toast.success {
  border-color: var(--success);
}

.toast.error {
  border-color: var(--danger);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.fade-in {
  animation: fadeIn 0.5s ease;
}

.fade-in-up {
  animation: fadeInUp 0.6s ease;
}

@media (max-width: 1024px) {
  .editor-layout {
    grid-template-columns: 1fr;
  }

  .controls-panel {
    max-height: none;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 12px;
  }

  .controls-panel .btn {
    grid-column: 1 / -1;
  }

  .download-section {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 8px;
  }

  .color-picker-section {
    grid-column: 1 / -1;
  }

  .info-grid {
    grid-column: 1 / -1;
  }
}

@media (max-width: 640px) {
  .navbar {
    padding: 0 16px;
    height: 56px;
  }

  .navbar-brand span {
    font-size: 0.9rem;
  }

  .hero {
    padding: 64px 16px 32px;
  }

  .hero-content {
    padding: 32px 20px;
  }

  .editor {
    padding: 64px 12px 12px;
  }

  .controls-panel {
    grid-template-columns: 1fr;
  }

  .download-section {
    grid-template-columns: 1fr;
  }

  .preview-toolbar {
    padding: 8px 12px;
    gap: 6px;
  }

  .color-swatch {
    width: 24px;
    height: 24px;
  }

  .color-picker-wrapper {
    width: 24px;
    height: 24px;
  }

  .toast {
    left: 16px;
    right: 16px;
    bottom: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    transition-duration: 0.01ms !important;
  }
}

[data-theme="dark"] .sun { display: none; }
[data-theme="dark"] .moon { display: block; }
[data-theme="light"] .sun { display: block; }
[data-theme="light"] .moon { display: none; }

.btn-ghost.active {
  background: var(--accent-light);
  color: var(--accent);
  border-color: var(--accent);
}

.compare-handle {
  pointer-events: none;
  touch-action: none;
}

.mask-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
}

.tool-toggle {
  display: flex;
  border-radius: var(--radius-sm);
  overflow: hidden;
  border: 1px solid var(--border-color);
  background: var(--bg-card);
}

.tool-toggle-btn {
  flex: 1;
  padding: 6px 12px;
  font-size: 0.8rem;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all var(--transition-fast);
  font-family: inherit;
}

.tool-toggle-btn.active {
  background: var(--accent);
  color: #fff;
}

.tool-toggle-btn:not(.active):hover {
  color: var(--text-primary);
  background: var(--bg-card-hover);
}

.mask-controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.mask-controls.hidden {
  display: none;
}

.mask-btn-group {
  display: flex;
  gap: 6px;
}

.mask-btn-group .btn {
  flex: 1;
}

.mask-btn-group .btn-sm.active {
  background: var(--accent);
  color: white;
  border-color: var(--accent);
}

.remover-section {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 12px;
  background: var(--bg-card);
  border-radius: var(--radius-sm);
}

.remover-controls {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.remover-controls.hidden {
  display: none;
}

.canvas-container.mask-edit-mode canvas {
  cursor: crosshair;
}

.canvas-container.pan-grab,
.canvas-container.pan-grab canvas {
  cursor: grab;
}

.canvas-container.pan-grab:active,
.canvas-container.pan-grab:active canvas {
  cursor: grabbing;
}

.range-row output {
  min-width: 32px;
  text-align: right;
  font-size: 0.8rem;
  color: var(--text-secondary);
}

.canvas-container.compare-mode {
  cursor: ew-resize;
}

.zoom-controls {
  display: flex;
  align-items: center;
  gap: 4px;
}

.zoom-controls span {
  min-width: 38px;
  text-align: center;
  font-size: 0.75rem;
  color: var(--text-secondary);
  font-variant-numeric: tabular-nums;
}

.btn-icon-sm {
  width: 26px;
  height: 26px;
  padding: 0;
  font-size: 1rem;
  line-height: 1;
  border-radius: var(--radius-sm);
  background: var(--bg-glass);
  border: 1px solid var(--border-glass);
  color: var(--text-secondary);
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all var(--transition-fast);
}

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

.app-footer {
  text-align: center;
  padding: 12px 24px;
  font-size: 0.75rem;
  color: var(--text-tertiary);
  background: var(--bg-primary);
  border-top: 1px solid var(--border-color);
}

.app-footer strong {
  color: var(--accent);
}