@scope (.popup-window) {
  :scope {
    position: absolute;
    top: 0;
    left: 0;
    min-inline-size: min(280px, 100%);
    max-inline-size: 100%;
    max-block-size: 100%;
    pointer-events: auto;
    display: flex;
    flex-direction: column;
    border: 1px solid color-mix(in oklch, var(--win-text) 28%, transparent);
    border-radius: var(--radius-lg);
    background: var(--win-bg);
    box-shadow: 0 8px 24px rgba(0,0,0,0.28);
    outline: none;
  }
  :scope.is-active {
    box-shadow: 0 18px 48px rgba(0,0,0,0.42);
  }
  :scope.is-opening {
    visibility: hidden;
  }
  :scope.is-minimized {
    display: none;
  }

  :scope.is-maximized {
    inset: 0;
    border-radius: 0;
    border-width: 0;
  }
  :scope.is-maximized,
  :scope[data-snapped] {
    box-shadow: none;
  }

  .popup-titlebar {
    position: relative;
    display: flex;
    align-items: center;
    gap: var(--space-2);
    flex-shrink: 0;
    block-size: var(--titlebar-h);
    padding-inline-start: var(--space-3);
    overflow: hidden;
    border-start-start-radius: calc(var(--radius-lg) - 1px);
    border-start-end-radius: calc(var(--radius-lg) - 1px);
    border-block-end: 1px solid var(--win-line);
    background: var(--win-bg);
    color: var(--win-text-soft);
    font: var(--fs-base) var(--font-main);
    cursor: default;
    touch-action: none;
    user-select: none;
  }
  :scope.is-active .popup-titlebar {
    background: var(--win-sunken);
    color: var(--win-text);
    box-shadow: inset 0 3px 0 var(--win-title);
  }
  :scope.is-maximized .popup-titlebar,
  :scope.is-maximized .popup-body {
    border-radius: 0;
  }

  .popup-icon {
    display: flex;
    flex-shrink: 0;
  }
  .popup-icon-img {
    inline-size: var(--icon-sm);
    block-size: var(--icon-sm);
    object-fit: contain;
  }

  .popup-title {
    flex: 1;
    min-inline-size: 0;
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }

  .popup-titlebar-actions {
    display: flex;
    align-self: stretch;
    flex-shrink: 0;
  }

  .popup-btn {
    display: grid;
    place-items: center;
    inline-size: calc(var(--titlebar-h) + 10px);
    padding: 0;
    border: none;
    background: transparent;
    color: inherit;
    cursor: pointer;
    transition: background-color var(--dur-fast) var(--ease-out), color var(--dur-fast) var(--ease-out);
  }
  .popup-btn svg {
    inline-size: var(--icon-sm);
    block-size: var(--icon-sm);
    fill: currentColor;
  }
  @media (hover: hover) {
    .popup-btn:hover { background: var(--win-hover); }
    .popup-close:hover { background: #c42b1c; color: #fff; }
  }
  .popup-btn:active { background: var(--win-pressed); }
  .popup-close:active { background: #a52619; color: #fff; }
  .popup-btn:focus-visible {
    outline: 2px solid transparent;
    box-shadow: inset 0 0 0 2px var(--win-accent);
  }

  .popup-glyph-restore,
  :scope.is-maximized .popup-glyph-maximize {
    display: none;
  }
  :scope.is-maximized .popup-glyph-restore {
    display: block;
  }

  .popup-body {
    position: relative;
    flex: 1 1 auto;
    min-block-size: 0;
    overflow: auto;
    border-end-start-radius: calc(var(--radius-lg) - 1px);
    border-end-end-radius: calc(var(--radius-lg) - 1px);
    background: var(--win-bg);
    color: var(--win-text);
  }

  .popup-error {
    display: grid;
    gap: var(--space-3);
    justify-items: start;
    inline-size: 320px;
    max-inline-size: 100%;
    padding: var(--space-5);
    font: var(--fs-base) var(--font-main);
    line-height: 1.5;
  }
  .popup-error p {
    margin: 0;
  }

  .popup-resize {
    position: absolute;
    z-index: 2;
    touch-action: none;
  }
  .popup-resize[data-dir="n"],
  .popup-resize[data-dir="s"] { inset-inline: 10px; block-size: 8px; cursor: ns-resize; }
  .popup-resize[data-dir="e"],
  .popup-resize[data-dir="w"] { inset-block: 10px; inline-size: 8px; cursor: ew-resize; }
  .popup-resize[data-dir="n"] { top: -4px; }
  .popup-resize[data-dir="s"] { bottom: -4px; }
  .popup-resize[data-dir="e"] { right: -4px; }
  .popup-resize[data-dir="w"] { left: -4px; }
  .popup-resize[data-dir="ne"],
  .popup-resize[data-dir="nw"],
  .popup-resize[data-dir="se"],
  .popup-resize[data-dir="sw"] { inline-size: 14px; block-size: 14px; }
  .popup-resize[data-dir="ne"] { top: -4px; right: -4px; cursor: nesw-resize; }
  .popup-resize[data-dir="sw"] { bottom: -4px; left: -4px; cursor: nesw-resize; }
  .popup-resize[data-dir="nw"] { top: -4px; left: -4px; cursor: nwse-resize; }
  .popup-resize[data-dir="se"] { bottom: -4px; right: -4px; cursor: nwse-resize; }

  @media (pointer: coarse) {
    .popup-resize:not([data-dir="se"]) {
      display: none;
    }
    .popup-resize[data-dir="se"] {
      bottom: 0;
      right: 0;
      inline-size: 28px;
      block-size: 28px;
      border-end-end-radius: var(--radius-lg);
      background: linear-gradient(135deg, transparent 0 55%, var(--win-line) 55% 62%, transparent 62% 72%, var(--win-line) 72% 79%, transparent 79%);
    }
  }

  :scope.is-maximized .popup-resize {
    display: none;
  }

  @media (max-width: 599px), (max-height: 499px) {
    .popup-maximize,
    .popup-resize {
      display: none;
    }
  }
}