.app-shell {
      display: grid;
      grid-template-columns: minmax(280px, 1fr) 2fr;
      grid-template-rows: auto 1fr auto;
      height: 100vh;
      overflow: hidden;
    }
    .app-shell > header { grid-column: 1 / -1; }
    .app-shell > .site-footer-global { grid-column: 1 / -1; }
    .app-shell > .app-sidebar {
      grid-row: 2;
      grid-column: 1;
      min-width: 0;
    }
    .app-shell > main {
      grid-row: 2;
      grid-column: 2;
      min-width: 0;
    }
    .tool-page-shell {
      display: grid;
      grid-template-rows: auto 1fr auto;
      min-height: 100vh;
      height: 100vh;
      overflow: hidden;
      max-width: 100vw;
    }
    .tool-page-shell > .site-footer-global {
      grid-column: 1 / -1;
    }
    .tool-page-shell > header {
      min-width: 0;
      overflow-x: auto;
    }
    .tool-page-shell > main.tool-layout {
      min-height: 0;
      min-width: 0;
      overflow: hidden;
    }
    .tool-layout {
      display: grid;
      grid-template-columns: minmax(280px, 1fr) 2fr;
      flex: 1;
      min-height: 0;
      min-width: 0;
      height: 100%;
    }
    .tool-sidebar {
      overflow-x: hidden;
      overflow-y: auto;
      padding: 0.5rem;
      background: oklch(var(--b2));
      border-right: 1px solid oklch(var(--b3));
      display: flex;
      flex-direction: column;
      gap: 0.5rem;
      min-height: 0;
      min-width: 0;
    }
    .tool-sidebar .card,
    .tool-sidebar .card-body {
      min-width: 0;
    }
    .tool-sidebar .compact-field {
      min-width: 0;
    }
    .tool-sidebar .input,
    .tool-sidebar .select {
      min-width: 0;
      max-width: 100%;
    }
    .tool-stage {
      display: flex;
      align-items: center;
      justify-content: center;
      min-height: 0;
      min-width: 0;
      background: #0c0e14;
      overflow: auto;
      padding: 0.5rem;
    }
    .preview-viewport {
      position: relative;
    }
    .preview-viewport.preview-grid-mode {
      --grid-cell: 10px;
      --grid-tone-a: #565656;
      --grid-tone-b: #464646;
      background-color: var(--grid-tone-a);
      background-image:
        linear-gradient(45deg, var(--grid-tone-b) 25%, transparent 25%),
        linear-gradient(-45deg, var(--grid-tone-b) 25%, transparent 25%),
        linear-gradient(45deg, transparent 75%, var(--grid-tone-b) 75%),
        linear-gradient(-45deg, transparent 75%, var(--grid-tone-b) 75%);
      background-size: calc(var(--grid-cell) * 2) calc(var(--grid-cell) * 2);
      background-position:
        0 0,
        0 var(--grid-cell),
        var(--grid-cell) calc(var(--grid-cell) * -1),
        calc(var(--grid-cell) * -1) 0;
    }
    .preview-viewport.preview-grid-mode::before,
    .preview-viewport.preview-grid-mode::after {
      content: "";
      position: absolute;
      pointer-events: none;
      z-index: 1;
    }
    .preview-viewport.preview-grid-mode::before {
      left: 0;
      right: 0;
      top: 50%;
      height: 1px;
      background: rgba(0, 0, 0, 0.92);
      box-shadow: 0 0 0 0.5px rgba(255, 255, 255, 0.06);
    }
    .preview-viewport.preview-grid-mode::after {
      top: 0;
      bottom: 0;
      left: 50%;
      width: 1px;
      background: rgba(0, 0, 0, 0.92);
      box-shadow: 0 0 0 0.5px rgba(255, 255, 255, 0.06);
    }
    .preview-viewport.preview-grid-mode canvas {
      position: relative;
      z-index: 2;
    }
    .preview-viewport.preview-grid-mode #pixi-root {
      z-index: 2;
      background: transparent !important;
    }
    .tool-stage canvas {
      max-width: 100%;
      max-height: 100%;
      image-rendering: pixelated;
    }
    .tool-thumbs {
      display: flex;
      flex-wrap: wrap;
      gap: 0.375rem;
      padding: 0 0.25rem 0.25rem;
    }
    .tool-thumb {
      display: flex;
      flex-direction: column;
      align-items: center;
      gap: 0.125rem;
      font-size: 0.5625rem;
      opacity: 0.85;
      max-width: 3.5rem;
    }
    .tool-thumb canvas {
      border: 1px solid oklch(var(--b3));
      border-radius: 0.25rem;
      background: #12151c;
    }
    .tool-thumb span {
      text-overflow: ellipsis;
      overflow: hidden;
      white-space: nowrap;
      width: 100%;
      text-align: center;
    }
    header nav[aria-label="Tools"] {
      scrollbar-width: thin;
    }
    header nav[aria-label="Tools"] .join-item.btn {
      white-space: nowrap;
    }
    .footer-support .btn-xs,
    .header-support .btn-xs {
      height: 1.75rem;
      min-height: 1.75rem;
      font-size: 0.6875rem;
    }
    .header-support {
      flex-shrink: 0;
    }
    .header-support img {
      height: 1.75rem;
      width: auto;
    }
    #pixi-root {
      flex: 1;
      min-height: 0;
      cursor: grab;
      touch-action: none;
      overflow: hidden;
    }
    #pixi-root.is-panning { cursor: grabbing; }
    #pixi-root canvas {
      display: block;
      width: 100%;
      height: 100%;
      object-fit: contain;
    }
    .viewer-canvas-bg { background: #0c0e14; }
    .dropzone.dragover {
      border-color: oklch(var(--p));
      background: oklch(var(--p) / 0.08);
    }
    .join.join-wrap {
      flex-wrap: wrap;
    }
    .join.join-wrap .join-item.btn {
      flex: 0 1 auto;
    }
    .playback-row .playback-join {
      width: auto;
    }
    .playback-join .join-item.btn {
      height: 1.25rem;
      min-height: 1.25rem;
      padding-left: 0.375rem;
      padding-right: 0.375rem;
      font-size: 0.625rem;
      line-height: 1;
    }
    .sidebar-compact .compact-label {
      width: 3.25rem;
      font-size: 0.625rem;
      font-weight: 500;
      opacity: 0.7;
      line-height: 1.2;
      flex-shrink: 0;
    }
    .sidebar-compact .compact-field {
      min-height: 0;
    }
    .sidebar-compact .input.input-xs,
    .sidebar-compact .select.select-xs {
      height: 1.5rem;
      min-height: 1.5rem;
      font-size: 0.6875rem;
      padding-left: 0.375rem;
      padding-right: 0.375rem;
    }
    .sidebar-compact .btn.btn-xs {
      height: 1.5rem;
      min-height: 1.5rem;
      font-size: 0.6875rem;
    }
    .sidebar-compact .range-xs {
      height: 0.875rem;
    }
    .sidebar-compact .table-xs :is(td, th) {
      padding: 0.25rem 0.375rem;
      font-size: 0.625rem;
    }
    .sidebar-compact .label {
      min-height: 0;
      padding-top: 0;
      padding-bottom: 0;
    }
    .join .join-item.btn:has(input[type="radio"]:checked) {
      --btn-bg: var(--btn-color, var(--p));
      background-color: oklch(var(--btn-bg));
      border-color: oklch(var(--btn-bg));
      color: oklch(var(--btn-fg, var(--pc)));
    }
    .how-to-sidebar .how-to-content .how-to-lead {
      font-size: 0.6875rem;
      line-height: 1.55;
      opacity: 0.78;
      margin-bottom: 0.5rem;
    }
    .how-to-sidebar .how-to-content h3 {
      font-size: 0.6875rem;
      font-weight: 600;
      margin-top: 0.75rem;
      margin-bottom: 0.25rem;
      opacity: 0.88;
    }
    .how-to-sidebar .how-to-content h3:first-of-type {
      margin-top: 0.25rem;
    }
    .how-to-sidebar .how-to-content p,
    .how-to-sidebar .how-to-content li {
      font-size: 0.6875rem;
      line-height: 1.55;
      opacity: 0.78;
    }
    .how-to-sidebar .how-to-content ol,
    .how-to-sidebar .how-to-content ul {
      padding-left: 1.125rem;
      margin: 0.25rem 0 0.625rem;
    }
    .how-to-sidebar .how-to-content ol li + li,
    .how-to-sidebar .how-to-content ul li + li {
      margin-top: 0.3rem;
    }
    .how-to-sidebar .how-to-content a {
      text-decoration: underline;
      text-underline-offset: 2px;
    }
    .how-to-sidebar .how-to-content code {
      font-size: 0.625rem;
      padding: 0.05em 0.3em;
      border-radius: 0.2rem;
      background: oklch(var(--b3));
    }
    .how-to-sidebar .how-to-faq {
      margin-top: 0.625rem;
      padding-top: 0.625rem;
      border-top: 1px solid oklch(var(--b3));
    }
    .how-to-sidebar .how-to-faq h3 {
      margin-top: 0;
    }
    .how-to-sidebar .how-to-faq dt {
      font-weight: 600;
      font-size: 0.6875rem;
      margin-top: 0.5rem;
    }
    .how-to-sidebar .how-to-faq dd {
      font-size: 0.6875rem;
      margin-left: 0;
      margin-top: 0.15rem;
      opacity: 0.78;
      line-height: 1.55;
    }
    .how-to-sidebar .how-to-related {
      margin-top: 0.625rem;
      font-size: 0.625rem;
      opacity: 0.65;
      line-height: 1.45;
    }
    @media (max-width: 900px) {
      .app-shell {
        height: auto;
        min-height: 100vh;
        overflow: auto;
        grid-template-columns: 1fr;
        grid-template-rows: auto auto minmax(50vh, 1fr) auto;
      }
      .app-shell > .app-sidebar {
        grid-row: auto;
        grid-column: auto;
        max-height: 50vh;
      }
      .app-shell > main {
        grid-row: auto;
        grid-column: auto;
      }
      .tool-page-shell {
        height: auto;
        min-height: 100vh;
        overflow: auto;
      }
      .tool-layout {
        grid-template-columns: 1fr;
        grid-template-rows: auto minmax(50vh, 1fr);
      }
      .tool-sidebar {
        max-height: none;
        border-right: none;
        border-bottom: 1px solid oklch(var(--b3));
      }
    }