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

  :root {
      --primary: #0284c7;
      --primary-hover: #0ea5e9;
      --secondary: #7dd3fc;

      --bg-dark: #0a0e14;
      --bg-darker: #05070b;
      --bg-panel: #111827;

      --text-primary: #f8fafc;
      --text-secondary: #94a3b8;
      --border: #1e293b;

      --accent: #f59e0b;
  }

  [data-theme="light"] {
      --primary: #0284c7;
      --primary-hover: #0369a1;
      --secondary: #38bdf8;

      --bg-dark: #f8fafc;
      --bg-darker: #ffffff;
      --bg-panel: #f1f5f9;

      --text-primary: #0f172a;
      --text-secondary: #475569;
      --border: #e2e8f0;

      --accent: #f59e0b;
  }

  [data-theme="dark"] .TSD-3d-indicator {
      filter: brightness(2)
  }

  html {
      overflow: hidden;
  }

  body {
      font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
      background: linear-gradient(135deg, var(--bg-darker) 0%, var(--bg-dark) 100%);
      color: var(--text-primary);
      height: 100vh;
      overflow: hidden;
      transition: background 0.3s ease, color 0.3s ease;
  }

  .app-container {
      display: grid;
      grid-template-columns: 1fr 380px;
      grid-template-rows: auto 1fr;
      height: 100vh;
  }

  /* Header */
  .header {
      grid-column: 1 / -1;
      background: var(--bg-panel);
      border-bottom: 1px solid var(--border);
      padding: 1rem 2rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
  }

  .logo {
      font-size: 1.5rem;
      font-weight: 700;
      background: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
      display: flex;
      align-items: center;
  }

  .logo img {
      display: block;
      height: 1.75rem;
      width: 1.75rem;
      margin-right: 0.25rem;
  }

  .header-actions {
      display: flex;
      gap: 0.75rem;
      align-items: center;
  }

  .header-actions .btn {
      padding: 0.5rem;
      height: 2.5rem;
  }

  .theme-switcher {
      background: var(--bg-dark);
      border: 1px solid var(--border);
      color: var(--text-primary);
      padding: 0.5rem;
      border-radius: 0.5rem;
      cursor: pointer;
      transition: all 0.2s;
      font-size: 1.25rem;
      width: 2.5rem;
      height: 2.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
  }

  .theme-switcher:hover {
      background: var(--primary);
      border-color: var(--primary);
  }

  /* Main Viewer */
  .viewer-container {
      position: relative;
      display: flex;
      align-items: center;
      justify-content: center;
      background: linear-gradient(0deg, var(--bg-panel), var(--bg-darker));
  }

  [data-theme="light"] .viewer-container {
      background: linear-gradient(0deg, #e7e7e7, var(--bg-darker));
  }

  .viewer-placeholder {
      width: 100%;
      max-width: 800px;
      aspect-ratio: 16/10;
      background: var(--bg-panel);
      border: 2px dashed var(--border);
      border-radius: 1rem;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      gap: 1rem;
      transition: background 0.3s ease, border-color 0.3s ease;
  }

  .viewer-placeholder-icon {
      font-size: 4rem;
      opacity: 0.3;
  }

  .viewer-placeholder-text {
      color: var(--text-secondary);
      font-size: 1.125rem;
  }

  /* Camera Controls Overlay */
  .camera-controls,
  .vertical-toolbar {
      position: absolute;
      bottom: 2rem;
      left: 50%;
      transform: translateX(-50%);
      background: var(--bg-panel);
      backdrop-filter: blur(10px);
      border: 1px solid var(--border);
      border-radius: 1.5rem;
      padding: 0.75rem 1.5rem;
      display: flex;
      gap: 0.5rem;
  }

  .vertical-toolbar {
      top: 2rem;
      right: auto;
      left: 2rem;
      bottom: auto;
      flex-direction: column;
      padding: 1rem .75rem;
      transform: none;

  }

  .camera-btn,
  .toolbar-btn {
      background: var(--bg-dark);
      border: 1px solid var(--border);
      color: var(--text-primary);
      padding: 0.5rem 1rem;
      border-radius: 1.5rem;
      cursor: pointer;
      transition: border 0.2s, color 0.2s;
      font-size: 0.875rem;
  }

  .toolbar-btn {
      border-radius: 99999px;
      width: 2.5rem;
      height: 2.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
      background-image: linear-gradient(135deg, var(--primary), var(--secondary));
      -webkit-background-clip: text;
      -webkit-text-fill-color: transparent;
      background-clip: text;
  }

  .toolbar-btn img {
      width: 1.75rem;
      height: 1.75rem;
      display: block;
  }

  .camera-btn:hover {
      border-color: var(--primary);
  }

  .toolbar-btn:hover,
  .toolbar-btn.is-active {
      background: var(--text-primary);
      border-color: var(--primary);
      background-clip: text;
  }

  [data-theme="light"] .toolbar-btn.is-active img {
      filter: brightness(0)
  }

  [data-theme="dark"] .toolbar-btn.is-active img {
      filter: brightness(10)
  }

  /* Side Panel */
  .side-panel {
      background: var(--bg-panel);
      border-left: 1px solid var(--border);
      overflow-y: auto;
      display: flex;
      flex-direction: column;
      transform: translateX(100%);
      transition: transform 1000ms cubic-bezier(.17, .67, 0, 1) 1750ms;
  }

  .side-panel.is-open {
      transform: translateX(0);
  }

  .panel-section {
      padding: 1.5rem;
      border-bottom: 1px solid var(--border);
  }

  .panel-section:last-child {
      border-bottom: none;
  }

  .section-title {
      font-size: 0.875rem;
      font-weight: 600;
      text-transform: uppercase;
      letter-spacing: 0.05em;
      color: var(--text-secondary);
      margin-bottom: 1rem;
      display: flex;
      align-items: center;
  }

  .section-title span {
      font-size: 0.75rem;
      font-weight: 400;
      text-transform: none;
      margin-left: auto;
      text-decoration: underline;
      cursor: pointer;
      margin-right: 0.25rem;
      display: block;
  }

  /* Shoe Side Toggle */
  .shoe-toggle {
      display: flex;
      background: var(--bg-dark);
      border-radius: 0.5rem;
      padding: 0.25rem;
      margin-bottom: 1.5rem;
  }

  .toggle-btn {
      flex: 1;
      padding: 0.5rem;
      border: none;
      background: transparent;
      color: var(--text-secondary);
      cursor: pointer;
      border-radius: 0.375rem;
      transition: all 0.2s;
      font-weight: 500;
  }

  .toggle-btn.is-active {
      background: var(--primary);
      color: white;
  }

  /* Panel Colors */
  .panel-grid {
      display: grid;
      gap: 0.75rem;
  }

  .panel-item {
      background: var(--bg-dark);
      border: 1px solid var(--border);
      border-radius: 0.5rem;
      padding: 0.75rem;
      transition: all 0.2s;
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
  }

  .panel-item:hover {
      border-color: var(--primary);
  }

  .panel-header {
      display: flex;
      justify-content: space-between;
      align-items: center;
  }

  .panel-name {
      font-size: 0.875rem;
      font-weight: 500;
  }

  .panel-controls {
      display: flex;
      gap: 0.5rem;
      align-items: center;
  }

  .color-input-wrapper {
      position: relative;
      width: 2rem;
      height: 2rem;
      border-radius: 0.375rem;
      overflow: hidden;
      border: 2px solid var(--border);
      cursor: pointer;
      transition: all 0.2s;
  }

  .color-input-wrapper:hover {
      border-color: var(--primary);
  }

  .color-input {
      width: 100%;
      height: 100%;
      border: none;
      cursor: pointer;
  }

  .gradient-toggle {
      background: var(--bg-panel);
      border: 1px solid var(--border);
      padding: 0.375rem 0.5rem;
      border-radius: 0.375rem;
      cursor: pointer;
      font-size: 0.75rem;
      color: var(--text-secondary);
      transition: all 0.2s;
  }

  .is-active .gradient-toggle {
      background: var(--accent);
      border-color: var(--accent);
      color: var(--bg-dark);
  }

  .gradient-color-wrapper {
      display: none;
      align-items: center;
      gap: .5rem;
  }

  .is-active .gradient-color-wrapper {
      display: flex;
  }

  .gradient-controls {
      padding-top: 0.5rem;
      border-top: 1px solid var(--border);
      display: none;
  }

  .is-active .gradient-controls {
      display: block;
  }

  .gradient-inputs {
      display: flex;
      gap: 0.5rem;
      align-items: center;
  }

  .gradient-label {
      font-size: 0.75rem;
      color: var(--text-secondary);
  }

  .gradient-settings {
      display: flex;
      flex-direction: row;
      justify-content: space-around;
      gap: 0.75rem;
  }

  .gradient-setting {
      display: flex;
      align-items: center;
      gap: 0.5rem;
      font-size: 0.75rem;
  }

  .gradient-setting span:first-child {
      color: var(--text-secondary);
      min-width: 45px;
  }

  .gradient-angle,
  .gradient-stop {
      flex: 1;
      background: var(--bg-panel);
      border: 1px solid var(--border);
      color: var(--text-primary);
      padding: 0.375rem 0.5rem;
      border-radius: 0.375rem;
      font-size: 0.75rem;
      font-weight: 500;
      outline: none;
      cursor: ew-resize;
      transition: all 0.2s;
      -moz-appearance: textfield;
  }

  .gradient-angle::-webkit-outer-spin-button,
  .gradient-angle::-webkit-inner-spin-button,
  .gradient-stop::-webkit-outer-spin-button,
  .gradient-stop::-webkit-inner-spin-button {
      -webkit-appearance: none;
      margin: 0;
  }

  .gradient-angle:hover,
  .gradient-stop:hover {
      border-color: var(--primary);
  }

  .gradient-angle:focus,
  .gradient-stop:focus {
      border-color: var(--primary);
      cursor: text;
  }

  .gradient-angle.dragging,
  .gradient-stop.dragging {
      background: var(--primary);
      color: white;
      cursor: ew-resize;
      user-select: none;
  }

  .gradient-unit {
      color: var(--text-secondary);
      font-weight: 500;
      min-width: 20px;
      font-size: 0.75rem;
  }

  /* Presets */
  .presets-grid {
      display: grid;
      grid-template-columns: repeat(2, 1fr);
      gap: 0.75rem;
  }

  .preset-card {
      background: var(--bg-dark);
      border: 2px solid var(--border);
      border-radius: 0.5rem;
      padding: 1rem;
      cursor: pointer;
      transition: all 0.2s;
      text-align: center;
  }

  .preset-card:hover {
      border-color: var(--primary);
      transform: translateY(-2px);
  }

  .preset-colors {
      display: flex;
      gap: 0.25rem;
      margin-bottom: 0.5rem;
      height: 2rem;
      border-radius: 0.25rem;
      overflow: hidden;
  }

  .preset-color {
      flex: 1;
  }

  .preset-name {
      font-size: 0.75rem;
      font-weight: 500;
  }

  /* Upload Section */
  .upload-area {
      background: var(--bg-dark);
      border: 2px dashed var(--border);
      border-radius: 0.5rem;
      padding: 2rem;
      text-align: center;
      cursor: pointer;
      transition: all 0.2s;
      display: block;
  }

  .upload-area:hover {
      border-color: var(--primary);
      background: rgba(99, 102, 241, 0.05);
  }

  .upload-icon {
      font-size: 2rem;
      margin-bottom: 0.5rem;
      opacity: 0.5;
  }

  .upload-text {
      font-size: 0.875rem;
      color: var(--text-secondary);
      margin-bottom: 0.25rem;
  }

  .upload-hint {
      font-size: 0.75rem;
      color: var(--text-secondary);
      opacity: 0.7;
  }

  .upload-input {
      display: none;
  }

  .panel-selector {
      margin-top: 1rem;
  }

  .panel-select {
      width: 100%;
      background: var(--bg-dark);
      border: 1px solid var(--border);
      color: var(--text-primary);
      padding: 0.5rem;
      border-radius: 0.375rem;
      font-size: 0.875rem;
  }

  /* Export Buttons */
  .btn {
      width: 100%;
      padding: 0.875rem;
      border: none;
      border-radius: 0.5rem;
      font-weight: 600;
      cursor: pointer;
      transition: all 0.2s;
      font-size: 0.875rem;
  }

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

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

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

  .btn-secondary:hover {
      border-color: var(--primary);
  }

  .btn-accent {
      background: linear-gradient(135deg, var(--accent), #f97316);
      color: white;
  }

  .btn-accent:hover {
      transform: translateY(-2px);
      box-shadow: 0 10px 20px rgba(245, 158, 11, 0.3);
  }

  .export-grid {
      display: grid;
      gap: 0.75rem;
  }

  /* Scrollbar */
  .side-panel::-webkit-scrollbar {
      width: 8px;
  }

  .side-panel::-webkit-scrollbar-track {
      background: var(--bg-dark);
  }

  .side-panel::-webkit-scrollbar-thumb {
      background: var(--border);
      border-radius: 4px;
  }

  .side-panel::-webkit-scrollbar-thumb:hover {
      background: var(--primary);
  }

  /* Responsive */
  @media (max-width: 1024px) {
      .app-container {
          grid-template-columns: 1fr;
          grid-template-rows: auto 1fr auto;
      }

      .side-panel {
          border-left: none;
          border-top: 1px solid var(--border);
          max-height: 50vh;
          transform: translateY(100%);
          transition: transform 1000ms cubic-bezier(.17, .67, 0, 1) 1250ms;
      }

      .side-panel.is-open {
          transform: translateY(0);
      }

      .camera-controls {
          bottom: 1rem;
      }
  }

  @media (max-width: 640px) {
      .header {
          padding: 1rem;
      }

      .logo {
          font-size: 1.25rem;
      }

      .viewer-container {
          padding: 0;
      }

      .panel-section {
          padding: 1rem;
      }

      .presets-grid {
          grid-template-columns: 1fr;
      }

      .TSD-3d-indicator {
          display: none !important;
      }

      .vertical-toolbar {
          left: 1rem;
          top: 1rem;
      }

      .camera-controls {
          display: none;
      }
  }