[data-app-window='settings'] [data-window-content] { padding: 0; }

[data-settings-app] {
  display: grid;
  font-family: var(--mono);
  grid-template-columns: 180px minmax(0, 1fr);
  height: 100%;
  min-height: 0;
}

[data-settings-nav] {
  border-right: 1px solid var(--os-surface-highlight);
  display: flex;
  flex-direction: column;
}

[data-settings-nav] button,
[data-replay-boot] {
  background: var(--os-surface);
  border: 0;
  border-bottom: 1px solid var(--os-surface-highlight);
  border-radius: 0;
  color: var(--os-ink);
  font-family: var(--mono);
  min-height: 46px;
  padding: 10px 14px;
  text-align: left;
  transition:
    transform var(--press-duration) var(--ease-out),
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease,
    box-shadow var(--ui-duration) var(--ease-out);
}

[data-settings-nav] button[aria-pressed='true'] {
  background: var(--os-accent);
  color: var(--os-canvas);
}

[data-settings-panel] {
  align-content: start;
  display: grid;
  gap: 18px;
  min-width: 0;
  overflow: auto;
  padding: 28px;
  transition: opacity var(--ui-duration) var(--ease-out), transform var(--ui-duration) var(--ease-out);

  @starting-style {
    opacity: 0;
    transform: translateY(6px);
  }
}

[data-settings-panel] h3 {
  border-bottom: 4px double var(--os-accent);
  font-family: var(--serif);
  font-size: 32px;
  font-weight: 400;
  padding-bottom: 12px;
}

[data-settings-panel-kicker] {
  background: var(--os-surface-raised);
  color: var(--os-ink);
  font-size: 11px;
  padding: 7px 9px;
  text-transform: uppercase;
}

[data-settings-field],
[data-settings-meter] {
  align-items: center;
  border-bottom: 1px dotted var(--os-surface-highlight);
  display: grid;
  gap: 12px;
  grid-template-columns: minmax(150px, 1fr) minmax(160px, 0.8fr);
  min-height: 50px;
  padding-bottom: 12px;
}

[data-settings-meter] { grid-template-columns: minmax(150px, 1fr) 5ch minmax(140px, 0.8fr); }
[data-settings-meter] output { text-align: right; }

[data-settings-field] select,
[data-settings-meter] input[type='range'] {
  accent-color: var(--os-accent);
  background: var(--os-surface);
  border: 1px solid var(--os-surface-highlight);
  border-radius: 0;
  color: var(--os-ink);
  font-family: var(--mono);
  min-height: 34px;
  min-width: 0;
  padding: 4px 8px;
  width: 100%;
}

/* Native <select> dropdowns on Windows Chromium can flicker or immediately
 * collapse if the element has CSS transitions. Keep transitions only on the
 * range input, not on the select. */
[data-settings-meter] input[type='range'] {
  transition:
    border-color var(--ui-duration) ease,
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease;
}

[data-settings-toggle] {
  align-items: center;
  display: flex;
  gap: 12px;
  min-height: 38px;
}

[data-settings-toggle] input {
  accent-color: var(--os-accent);
  height: 18px;
  width: 18px;
}

[data-settings-toggle-state] {
  font-size: 10px;
  margin-left: auto;
  opacity: 0.75;
  text-transform: uppercase;
}

@media (hover: hover) and (pointer: fine) {
  [data-settings-nav] button:hover,
  [data-replay-boot]:hover { background: color-mix(in srgb, var(--os-accent) 18%, var(--os-surface)); }

  [data-settings-nav] button[aria-pressed='true']:hover { background: var(--os-accent); }
}

[data-replay-boot] {
  border: 1px solid var(--os-surface-highlight);
  box-shadow: 4px 4px 0 var(--os-shadow);
  justify-self: start;
  margin-top: 8px;
}

[data-replay-boot]:active {
  box-shadow: 1px 1px 0 var(--os-shadow);
  transform: translate(1px, 1px);
}

[data-settings-app] button:focus-visible,
[data-settings-app] select:focus-visible,
[data-settings-app] input:focus-visible {
  outline: var(--os-focus-width) solid var(--os-accent-bright);
  outline-offset: 2px;
}

/* The resident remains a foreground object, so its focus ring uses the bright system accent. */
[data-bot-standby]:focus-visible {
  outline: var(--os-focus-width) solid var(--os-accent-bright);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  [data-settings-panel],
  [data-settings-app] button,
  [data-settings-app] select,
  [data-settings-app] input { transition-duration: 1ms; }
}

/* ── Projects: Finder shell + ring carousel ───────────────── */

[data-app-window='projects'] [data-window-content] { padding: 0; }

[data-projects-app] {
  display: flex;
  flex-direction: column;
  font-family: var(--mono);
  height: 100%;
  min-height: 0;
}

[data-projects-toolbar],
[data-projects-statusbar] {
  align-items: center;
  display: flex;
  flex: 0 0 auto;
  font-size: 10.5px;
  gap: 12px;
  justify-content: space-between;
  min-height: 34px;
  padding: 6px 12px;
  text-transform: uppercase;
}

[data-projects-toolbar] { border-bottom: 1px solid var(--os-surface-highlight); }
[data-projects-statusbar] { border-top: 1px solid var(--os-surface-highlight); }

[data-projects-crumb],
[data-projects-position] {
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

[data-projects-count],
[data-projects-hint] { flex: 0 0 auto; opacity: 0.75; }

[data-projects-ring] {
  cursor: grab;
  flex: 1 1 auto;
  min-height: 0;
  outline-offset: -2px;
  overflow: hidden;
  perspective: 1100px;
  position: relative;
  touch-action: pan-y;
}

[data-projects-ring]:active { cursor: grabbing; }

[data-projects-strip] {
  height: 100%;
  pointer-events: none;
  position: relative;
  transform-style: preserve-3d;
  width: 100%;
}

[data-projects-card] {
  align-items: stretch;
  backface-visibility: hidden;
  background: var(--os-surface);
  border: 1px solid var(--os-surface-highlight);
  border-radius: 0;
  color: var(--os-ink);
  display: flex;
  flex-direction: column;
  font-family: var(--mono);
  gap: 6px;
  left: 50%;
  padding: 8px;
  pointer-events: auto;
  position: absolute;
  text-align: left;
  text-decoration: none;
  top: 50%;
  transform-style: preserve-3d;
  width: 190px;
  will-change: transform;
}

[data-projects-card][aria-current='true'] { box-shadow: 6px 6px 0 var(--os-accent); }

[data-projects-card-frame] {
  border: 1px solid var(--os-surface-highlight);
  display: block;
  height: 148px;
  pointer-events: none;
}

[data-projects-card-canvas] { display: block; height: 100%; width: 100%; }
[data-projects-card-canvas][data-preview-failed] { display: none; }

[data-projects-card-label] {
  display: block;
  font-size: 10.5px;
  letter-spacing: 0.04em;
  overflow: hidden;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

[data-projects-card-meta] { display: block; font-size: 9.5px; opacity: 0.7; }

/* ── Writing: archive list ────────────────────────────────── */

[data-writing-app] {
  display: grid;
  font-family: var(--mono);
  gap: 16px;
  height: 100%;
}

[data-writing-header] { align-items: baseline; display: flex; gap: 12px; }

[data-writing-kicker],
[data-about-kicker],
[data-contact-kicker] {
  background: var(--os-accent);
  color: var(--os-canvas);
  display: inline-block;
  font-family: var(--mono);
  font-size: 11px;
  padding: 7px 9px;
  text-transform: uppercase;
}

[data-writing-count] { font-size: 10px; opacity: 0.75; }

[data-writing-list] { align-content: start; display: grid; list-style: none; }

[data-writing-list] a {
  align-items: baseline;
  background: var(--os-surface);
  border: 0;
  border-bottom: 1px dotted var(--os-surface-highlight);
  border-radius: 0;
  color: var(--os-ink);
  display: flex;
  font-family: var(--mono);
  gap: 12px;
  min-height: 46px;
  padding: 10px 4px;
  text-align: left;
  text-decoration: none;
  transition:
    transform var(--press-duration) var(--ease-out),
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease;
  width: 100%;
}

[data-writing-index] { flex: 0 0 auto; font-size: 10px; opacity: 0.6; }

[data-writing-date] { flex: 0 0 auto; font-size: 10.5px; opacity: 0.75; }

[data-writing-title] {
  font-family: var(--serif);
  font-size: 16px;
  min-width: 0;
}

[data-writing-tag] {
  flex: 0 0 auto;
  font-size: 10px;
  margin-left: auto;
  opacity: 0.75;
  text-transform: uppercase;
}

/* ── About: identity / experience / works / toolbox / now ─── */

[data-about-app] { align-content: start; display: grid; gap: 20px; height: 100%; }

[data-about-banner] {
  background: var(--os-canvas);
  border: 1px solid var(--os-surface-highlight);
  box-shadow: 6px 6px 0 var(--os-shadow);
  min-height: 142px;
  overflow: hidden;
  position: relative;
}

[data-about-banner-canvas] { display: block; height: 100%; width: 100%; }

[data-about-banner-copy] {
  bottom: 0;
  color: var(--os-ink);
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  left: 0;
  padding: 14px;
  pointer-events: none;
  position: absolute;
  right: 0;
  top: 0;
}

[data-about-banner-kicker],
[data-about-banner-trail] {
  font-family: var(--mono);
  font-size: 10px;
  line-height: 1.35;
}

[data-about-banner-kicker] { color: var(--os-accent-bright); letter-spacing: 2px; }
[data-about-banner-trail] { color: var(--os-ink); letter-spacing: 0.25px; }

[data-about-identity] {
  align-items: start;
  display: grid;
  gap: 16px;
  grid-template-columns: 132px minmax(0, 1fr);
}

[data-about-avatar-frame] {
  background: var(--os-surface);
  border: 1px solid var(--os-surface-highlight);
  box-shadow: 6px 6px 0 var(--os-shadow);
  min-width: 0;
  overflow: hidden;
}

[data-about-avatar-label] {
  background: var(--os-accent);
  color: var(--os-canvas);
  display: block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 0.5px;
  line-height: 1.2;
  padding: 6px 7px;
}

[data-about-avatar] {
  display: block;
  height: 126px;
  object-fit: cover;
  width: 100%;
}

[data-about-masthead] h3 {
  font-family: var(--serif);
  font-size: 42px;
  font-weight: 400;
  line-height: 1;
}

[data-about-role] { font-family: var(--mono); font-size: 11px; margin-top: 8px; opacity: 0.75; }

[data-about-section] { display: grid; gap: 10px; }

[data-about-bio] { font-family: var(--serif); font-size: 14px; line-height: 1.65; max-width: 56ch; }

[data-about-experience] { display: grid; list-style: none; }

[data-about-experience] li {
  border-bottom: 1px dotted var(--os-surface-highlight);
  display: grid;
  font-family: var(--mono);
  font-size: 11.5px;
  gap: 16px;
  grid-template-columns: minmax(110px, 0.65fr) 1fr;
  padding: 8px 0;
}

[data-about-experience-label] { opacity: 0.75; }

[data-about-works] { display: grid; list-style: none; }

[data-about-work] {
  border-bottom: 1px dotted var(--os-surface-highlight);
  display: grid;
  gap: 8px;
  padding: 10px 0;
}

[data-about-work-heading] {
  align-items: baseline;
  display: flex;
  gap: 12px;
  justify-content: space-between;
}

[data-about-work-name] {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 400;
  line-height: 1;
  margin: 0;
}

[data-about-work-link] {
  color: inherit;
  text-decoration: none;
}

[data-about-work-link]:hover {
  color: var(--os-accent);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

[data-about-work-meta] {
  font-family: var(--mono);
  font-size: 10px;
  margin-left: auto;
  opacity: 0.75;
  text-align: right;
}

[data-about-work-description] {
  font-family: var(--serif);
  font-size: 13px;
  line-height: 1.5;
  margin: 0;
  max-width: 56ch;
}

[data-about-toolbox] {
  display: grid;
  font-family: var(--mono);
  font-size: 11px;
  gap: 6px 24px;
  grid-template-columns: repeat(auto-fill, minmax(180px, 1fr));
  list-style: none;
}

[data-about-now] {
  display: grid;
  font-family: var(--mono);
  font-size: 11.5px;
  grid-template-columns: minmax(96px, auto) 1fr;
}

[data-about-now] dt,
[data-about-now] dd { border-bottom: 1px dotted var(--os-surface-highlight); padding: 8px 0; }
[data-about-now] dt { opacity: 0.75; }

/* ── Contact: channel directory ───────────────────────────── */

[data-contact-app] {
  display: flex;
  flex-direction: column;
  font-family: var(--mono);
  gap: 16px;
  height: 100%;
}

[data-contact-directory] { display: grid; }

[data-contact-row] {
  align-items: center;
  display: grid;
  gap: 12px;
  grid-template-columns: 76px minmax(0, 1fr) 44px;
  min-height: 46px;
}

[data-contact-row='head'] {
  border-bottom: 1px solid var(--os-surface-highlight);
  font-size: 10px;
  min-height: 34px;
  opacity: 0.75;
  text-transform: uppercase;
}

a[data-contact-row] {
  border-bottom: 1px dotted var(--os-surface-highlight);
  color: var(--os-ink);
  font-size: 11.5px;
  text-decoration: none;
  transition:
    transform var(--press-duration) var(--ease-out),
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease;
}

[data-contact-address] { min-width: 0; overflow-wrap: anywhere; }
[data-contact-status] { text-align: right; }
[data-contact-row='head'] span:last-child { text-align: right; }

[data-contact-footer] {
  background: var(--os-accent);
  color: var(--os-canvas);
  font-size: 11px;
  margin-top: auto;
  padding: 9px 12px;
  text-transform: uppercase;
}

/* ── Shared states ────────────────────────────────────────── */

@media (hover: hover) and (pointer: fine) {
  [data-writing-list] a:hover,
  a[data-contact-row]:hover { background: color-mix(in srgb, var(--os-accent) 18%, var(--os-surface)); }

  [data-projects-card]:hover { box-shadow: 6px 6px 0 var(--os-accent); }
}

[data-projects-card]:focus-visible,
[data-projects-ring]:focus-visible,
[data-writing-app] a:focus-visible,
[data-about-app] a:focus-visible,
[data-contact-app] a:focus-visible {
  outline: var(--os-focus-width) solid var(--os-accent-bright);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  [data-writing-list] a,
  a[data-contact-row] { transition-duration: 1ms; }
}

@media (max-width: 760px) {
  [data-projects-card] { width: 148px; }
  [data-projects-card-frame] { height: 118px; }
  [data-about-banner] { min-height: 128px; }
  [data-about-banner-copy] { padding: 12px; }
  [data-about-banner-kicker],
  [data-about-banner-trail] { font-size: 9px; }
  [data-about-identity] { gap: 14px; grid-template-columns: 120px minmax(0, 1fr); }
  [data-about-avatar] { height: 112px; }
  [data-about-masthead] h3 { font-size: 32px; }
  [data-contact-row] { grid-template-columns: 64px minmax(0, 1fr) 40px; }
}

/* ── Photos viewer (desktop folder) ───────────────────────── */

[data-photos-shell] {
  display: flex;
  flex-direction: column;
  font-family: var(--mono);
  gap: 12px;
  height: 100%;
  min-height: 0;
}

[data-photos-tabs] {
  border-bottom: 1px solid var(--os-surface-highlight);
  display: flex;
  flex: 0 0 auto;
  gap: 4px;
}

[data-photos-tabs] button,
[data-wallpaper-card],
[data-wallpaper-back],
[data-wallpaper-apply] {
  background: var(--os-surface-raised);
  border: 1px solid var(--os-surface-highlight);
  border-radius: 0;
  color: var(--os-ink);
  font-family: var(--mono);
  transition:
    transform var(--press-duration) var(--ease-out),
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease;
}

[data-photos-tabs] button {
  border-bottom: 0;
  font-size: 10px;
  min-height: 30px;
  padding: 6px 10px;
}

[data-photos-tabs] button[aria-selected='true'] {
  background: var(--os-accent);
  color: var(--os-canvas);
}

[data-photos-panel] {
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

[data-photos-panel][hidden] { display: none; }

[data-photos-shell] [data-folder-browser] { height: 100%; }

[data-wallpapers-view] {
  display: flex;
  flex-direction: column;
  height: 100%;
  min-height: 0;
}

[data-wallpaper-content] {
  display: flex;
  flex-direction: column;
  flex: 1;
  min-height: 0;
  overflow: hidden;
}

[data-wallpaper-grid] {
  display: grid;
  flex: 1;
  gap: 12px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  min-height: 0;
  overflow: auto;
  padding: 2px;
}

[data-wallpaper-card] {
  display: grid;
  gap: 8px;
  min-width: 0;
  padding: 8px;
  text-align: left;
}

[data-wallpaper-card] img,
[data-wallpaper-detail] > img {
  aspect-ratio: 16 / 9;
  background: var(--os-surface);
  border: 1px solid var(--os-surface-highlight);
  display: block;
  object-fit: cover;
  width: 100%;
}

[data-wallpaper-card-label] {
  font-size: 11px;
  overflow: hidden;
  text-overflow: ellipsis;
  text-transform: uppercase;
  white-space: nowrap;
}

[data-wallpaper-current-badge] {
  background: var(--os-accent);
  color: var(--os-canvas);
  font-size: 9px;
  justify-self: start;
  padding: 3px 5px;
  text-transform: uppercase;
}

[data-wallpaper-detail] {
  display: grid;
  gap: 12px;
  height: 100%;
  overflow: auto;
  padding: 2px;
}

[data-wallpaper-detail] h3 {
  font-family: var(--serif);
  font-size: 24px;
  font-weight: 400;
}

[data-wallpaper-description] { line-height: 1.55; }

[data-wallpaper-back],
[data-wallpaper-apply] {
  font-size: 10px;
  justify-self: start;
  min-height: 30px;
  padding: 6px 10px;
}

[data-wallpaper-apply] { background: var(--os-accent); color: var(--os-canvas); }
[data-wallpaper-apply]:disabled { cursor: wait; opacity: 0.7; }
[data-wallpaper-apply-status] { font-size: 10px; min-height: 1.2em; }

[data-photos-shell] button:focus-visible,
[data-wallpaper-card]:focus-visible,
[data-wallpaper-back]:focus-visible,
[data-wallpaper-apply]:focus-visible {
  outline: var(--os-focus-width) solid var(--os-accent-bright);
  outline-offset: 2px;
}

[data-photos-app] {
  display: flex;
  flex-direction: column;
  font-family: var(--mono);
  gap: 12px;
  height: 100%;
}

[data-photos-count] {
  font-size: 10px;
  letter-spacing: 1px;
  opacity: 0.75;
}

[data-photos-frame] {
  align-items: center;
  background: var(--os-surface);
  border: 1px solid var(--os-surface-highlight);
  box-shadow: 8px 8px 0 var(--os-shadow);
  display: flex;
  justify-content: center;
  padding: 12px;
}

[data-photos-frame] svg {
  display: block;
  height: auto;
  image-rendering: pixelated;
  width: min(384px, 100%);
}

[data-photos-caption] {
  align-items: baseline;
  display: flex;
  justify-content: space-between;
}

[data-photos-caption] h3 {
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 400;
}

[data-photos-date] {
  font-size: 10px;
  opacity: 0.75;
}

[data-photos-nav] {
  display: flex;
  gap: 8px;
  margin-top: auto;
}

[data-photos-nav] button {
  background: var(--os-surface-raised);
  border: 1px solid var(--os-surface-highlight);
  border-radius: 0;
  flex: 1;
  font-family: var(--mono);
  font-size: 11px;
  min-height: 32px;
  padding: 6px 10px;
  transition:
    transform var(--press-duration) var(--ease-out),
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease;
}

/* ── Albums player (desktop folder) ───────────────────────── */

[data-albums-app] {
  align-items: center;
  display: flex;
  flex-direction: column;
  font-family: var(--mono);
  gap: 12px;
  height: 100%;
  text-align: center;
}

[data-player-track] {
  align-self: flex-start;
  font-size: 10px;
  letter-spacing: 1px;
  opacity: 0.75;
}

[data-player-cover] {
  align-items: center;
  background: var(--os-surface);
  border: 1px solid var(--os-surface-highlight);
  box-shadow: 8px 8px 0 var(--os-shadow);
  display: flex;
  height: 150px;
  justify-content: center;
  line-height: 0;
  overflow: hidden;
  padding: 0;
  width: 150px;
}

[data-player-cover] svg {
  display: block;
  height: 128px;
  image-rendering: pixelated;
  width: 128px;
}

[data-player-cover] img {
  display: block;
  height: 100%;
  image-rendering: pixelated;
  object-fit: cover;
  width: 100%;
}

[data-player-title] {
  font-family: var(--serif);
  font-size: 22px;
  font-weight: 400;
}

[data-player-format] {
  font-size: 10px;
  opacity: 0.75;
}

[data-player-controls] {
  display: flex;
  gap: 8px;
  margin-top: auto;
}

[data-player-controls] button {
  align-items: center;
  background: var(--os-surface-raised);
  border: 1px solid var(--os-surface-highlight);
  border-radius: 0;
  display: inline-flex;
  font-family: var(--mono);
  font-size: 13px;
  justify-content: center;
  min-height: 36px;
  transition:
    transform var(--press-duration) var(--ease-out),
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease;
  width: 44px;
}

[data-player-toggle] {
  font-size: 16px !important;
  min-height: 44px !important;
  width: 56px !important;
}

[data-player-time] {
  font-size: 12px;
  letter-spacing: 2px;
}

@media (hover: hover) and (pointer: fine) {
  [data-photos-tabs] button:hover,
  [data-wallpaper-card]:hover,
  [data-wallpaper-back]:hover { background: color-mix(in srgb, var(--os-accent) 18%, var(--os-surface)); }

  [data-photos-nav] button:hover,
  [data-player-controls] button:hover { background: var(--os-accent); color: var(--os-canvas); }
}

[data-photos-app] button:focus-visible,
[data-albums-app] button:focus-visible {
  outline: var(--os-focus-width) solid var(--os-accent-bright);
  outline-offset: 2px;
}

@media (prefers-reduced-motion: reduce) {
  [data-photos-tabs] button,
  [data-wallpaper-card],
  [data-wallpaper-back],
  [data-wallpaper-apply],
  [data-photos-nav] button,
  [data-player-controls] button { transition-duration: 1ms; }
}

/* ── Collection folder / viewer shell ─────────────────────── */

[data-folder-browser] {
  display: flex;
  flex-direction: column;
  font-family: var(--mono);
  gap: 14px;
  height: 100%;
  min-height: 0;
}

[data-folder-header] {
  align-items: flex-start;
  border-bottom: 1px solid var(--os-surface-highlight);
  display: flex;
  flex: 0 0 auto;
  gap: 16px;
  justify-content: space-between;
  padding-bottom: 12px;
}

[data-folder-heading] { min-width: 0; }

[data-folder-kicker],
[data-folder-count],
[data-folder-hint],
[data-folder-item-meta],
[data-book-reader-kicker],
[data-book-reader-meta] {
  font-size: 10px;
  letter-spacing: 1px;
  opacity: 0.72;
}

[data-folder-title] {
  font-family: var(--serif);
  font-size: 28px;
  font-weight: 400;
  line-height: 1.05;
  margin: 4px 0;
}

[data-folder-hint] {
  flex: 0 0 auto;
  margin-top: 4px;
  text-align: right;
}

[data-folder-back],
[data-book-open] {
  background: var(--os-surface-raised);
  border: 1px solid var(--os-surface-highlight);
  border-radius: 0;
  color: var(--os-ink);
  font-family: var(--mono);
  font-size: 10px;
  min-height: 30px;
  padding: 6px 10px;
  text-decoration: none;
  transition:
    transform var(--press-duration) var(--ease-out),
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease;
}

[data-folder-list] {
  align-content: start;
  display: grid;
  flex: 1;
  gap: 20px 16px;
  grid-template-columns: repeat(auto-fill, minmax(128px, 1fr));
  min-height: 0;
  overflow: auto;
  padding: 4px 8px 12px 0;
}

[data-folder-item] {
  align-items: center;
  background: transparent;
  border: 0;
  border-radius: 0;
  color: var(--os-ink);
  display: flex;
  flex-direction: column;
  gap: 7px;
  min-width: 0;
  padding: 4px;
  text-align: center;
  transition: color var(--ui-duration) ease;
}

[data-folder-item-art] {
  align-items: center;
  background: var(--os-surface);
  border: 1px solid var(--os-surface-highlight);
  box-shadow: 5px 5px 0 var(--os-shadow);
  display: flex;
  height: 92px;
  justify-content: center;
  line-height: 0;
  padding: 8px;
  transition:
    transform var(--ui-duration) var(--ease-out),
    box-shadow var(--ui-duration) var(--ease-out),
    background-color var(--ui-duration) ease,
    color var(--ui-duration) ease;
  width: min(128px, 100%);
}

[data-folder-item-art] svg {
  display: block;
  height: auto;
  image-rendering: pixelated;
  max-height: 100%;
  max-width: 100%;
  width: auto;
}

[data-folder-item-art] img {
  display: block;
  height: auto;
  image-rendering: pixelated;
  max-height: 100%;
  max-width: 100%;
  object-fit: cover;
  width: auto;
}

[data-album-item-art] {
  overflow: hidden;
  padding: 0;
}

[data-album-item-art] [data-album-cover-image] {
  height: 100%;
  max-height: none;
  max-width: none;
  object-fit: cover;
  width: 100%;
}

[data-folder-item-title] {
  font-size: 11px;
  line-height: 1.2;
  max-width: 100%;
  overflow-wrap: anywhere;
}

[data-folder-item][data-selected='true'] [data-folder-item-art],
[data-folder-item]:focus-visible [data-folder-item-art] {
  background: var(--os-accent);
  color: var(--os-canvas);
  transform: translateY(-2px);
}

[data-folder-item][data-selected='true'] { color: var(--os-accent-bright); }

[data-folder-item]:focus-visible,
[data-folder-back]:focus-visible,
[data-book-open]:focus-visible {
  outline: var(--os-focus-width) solid var(--os-accent-bright);
  outline-offset: 2px;
}

[data-folder-empty] {
  align-self: center;
  border: 1px solid var(--os-surface-highlight);
  font-size: 11px;
  justify-self: center;
  line-height: 1.8;
  max-width: 280px;
  padding: 18px;
  text-align: center;
}

[data-games-empty] code {
  display: inline-block;
  font-family: var(--mono);
  font-size: 10px;
  letter-spacing: 0.5px;
  margin-top: 4px;
}

/* ── Three.js / pixel bookshelf ────────────────────────────── */

[data-books-app] {
  height: 100%;
  min-height: 0;
  position: relative;
}

[data-bookshelf-stage] {
  background: var(--os-surface);
  border: 1px solid var(--os-surface-highlight);
  box-shadow: 6px 6px 0 var(--os-shadow);
  color: var(--os-ink);
  inset: 0;
  overflow: hidden;
  position: absolute;
}

[data-bookshelf-canvas] {
  display: block;
  height: 100%;
  image-rendering: pixelated;
  width: 100%;
}

[data-bookshelf-masthead] {
  left: 26px;
  pointer-events: none;
  position: absolute;
  top: 25px;
  z-index: 1;
}

[data-bookshelf-inspector] {
  background: var(--os-surface-raised);
  border-left: 1px solid var(--os-surface-highlight);
  bottom: 12%;
  color: var(--os-ink);
  display: flex;
  flex-direction: column;
  gap: 10px;
  left: 66%;
  opacity: 0;
  padding: 22px 24px 22px 20px;
  pointer-events: none;
  position: absolute;
  right: 24px;
  top: 24%;
  transform: translateX(10px);
  transition: opacity var(--ui-duration) ease, transform var(--ui-duration) var(--ease-out);
  z-index: 2;
}

[data-bookshelf-inspector][data-bookshelf-inspector-state='active'] {
  opacity: 1;
  transform: translateX(0);
}

[data-bookshelf-inspector-kicker],
[data-bookshelf-inspector-meta] {
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 1px;
  margin: 0;
  opacity: 0.72;
}

[data-bookshelf-inspector-title] {
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 400;
  line-height: 1.08;
  margin: 0;
}

[data-bookshelf-inspector-description] {
  font-family: var(--serif);
  font-size: 14px;
  line-height: 1.5;
  margin: 4px 0 0;
  max-width: 280px;
}

[data-bookshelf-title] {
  color: var(--os-ink);
  font-family: var(--serif);
  font-size: 30px;
  font-weight: 400;
  letter-spacing: 0;
  line-height: 0.95;
  margin: 0 0 8px;
}

[data-bookshelf-count] {
  color: var(--os-accent-bright);
  display: block;
  font-family: var(--mono);
  font-size: 9px;
  letter-spacing: 1.1px;
  line-height: 1.4;
  margin: 0;
}

[data-books-app] > [data-folder-browser] {
  height: 100%;
  min-height: 0;
  position: relative;
  z-index: 2;
}

[data-books-app][data-bookshelf-view='folder'] > [data-folder-browser] {
  color: var(--os-ink);
  pointer-events: none;
}

[data-books-app][data-bookshelf-view='folder'] > [data-folder-browser] [data-folder-header] {
  border-bottom: 0;
  padding: 20px 26px 0;
  pointer-events: none;
}

[data-books-app][data-bookshelf-view='folder'] > [data-folder-browser] [data-folder-heading],
[data-books-app][data-bookshelf-view='folder'] > [data-folder-browser] [data-folder-hint] {
  display: none;
}

[data-books-app][data-bookshelf-view='folder'] > [data-folder-browser] [data-folder-list] {
  display: block;
  inset: 0;
  overflow: hidden;
  padding: 0;
  pointer-events: none;
  position: absolute;
}

[data-books-app][data-bookshelf-view='folder'] > [data-folder-browser] [data-folder-item] {
  opacity: 0;
  pointer-events: none;
  position: absolute;
}

[data-books-app][data-bookshelf-view='folder'] > [data-folder-browser] [data-folder-item]:focus-visible {
  opacity: 1;
  pointer-events: auto;
}

[data-books-app][data-bookshelf-view='folder'] [data-folder-empty] { display: none; }

[data-books-app][data-bookshelf-view='viewer'] [data-bookshelf-stage] { display: none; }

[data-books-app][data-bookshelf-view='viewer'] > [data-folder-browser] {
  color: var(--os-ink);
  pointer-events: auto;
}

[data-book-reader] {
  display: grid;
  gap: 16px;
  grid-template-columns: minmax(0, 1fr);
  grid-template-rows: auto minmax(0, 1fr) auto;
  height: 100%;
  min-height: 0;
}

[data-book-reader-masthead] { grid-column: 1 / -1; }

[data-book-reader-title] {
  font-family: var(--serif);
  font-size: 25px;
  font-weight: 400;
  line-height: 1.1;
  margin: 5px 0;
}

[data-book-reader-frame] {
  align-items: center;
  border: 1px solid var(--os-surface-highlight);
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-height: 0;
  overflow: auto;
  padding: 22px;
}

[data-book-reader-empty],
[data-book-reader-hint] {
  font-family: var(--mono);
  margin: 0;
  text-align: center;
}

[data-book-reader-empty] {
  font-size: 16px;
  margin-top: auto;
}

[data-book-reader-hint] { font-size: 10px; margin-bottom: auto; opacity: 0.7; }

[data-book-file-frame] {
  border: 0;
  height: 100%;
  min-height: 300px;
  width: 100%;
}

[data-book-open-file] {
  background: var(--os-surface-raised);
  border: 1px solid var(--os-surface-highlight);
  color: var(--os-ink);
  font-family: var(--mono);
  font-size: 10px;
  padding: 8px 12px;
  text-decoration: none;
}

[data-book-reader-nav] {
  display: flex;
  gap: 8px;
  grid-column: 1 / -1;
}

[data-book-reader-nav] button {
  background: var(--os-surface-raised);
  border: 1px solid var(--os-surface-highlight);
  border-radius: 0;
  font-family: var(--mono);
  font-size: 10px;
  min-height: 30px;
  padding: 6px 10px;
}

[data-book-reader-nav] button:focus-visible {
  outline: var(--os-focus-width) solid var(--os-accent-bright);
  outline-offset: 2px;
}

@media (hover: hover) and (pointer: fine) {
  [data-folder-back]:hover,
  [data-book-open-file]:hover,
  [data-book-reader-nav] button:hover {
    background: var(--os-accent);
    color: var(--os-canvas);
  }
}

@media (max-width: 760px) {
  [data-folder-header] { gap: 8px; }
  [data-folder-title] { font-size: 23px; }
  [data-folder-hint] { font-size: 9px; }
  [data-folder-list] { grid-template-columns: repeat(2, minmax(0, 1fr)); }
  [data-bookshelf-stage] { box-shadow: 4px 4px 0 var(--os-shadow); }
  [data-bookshelf-masthead] { left: 18px; top: 19px; }
  [data-bookshelf-title] { font-size: 25px; }
  [data-bookshelf-inspector] {
    border-left: 0;
    border-top: 1px solid var(--os-surface-highlight);
    bottom: 16px;
    left: 48%;
    padding: 12px 12px 0 0;
    right: 16px;
    top: auto;
  }
  [data-book-reader] {
    grid-template-columns: 1fr;
    grid-template-rows: auto auto minmax(0, 1fr) auto;
    overflow: auto;
  }
  [data-book-reader-frame] { padding: 14px; }
}

@media (prefers-reduced-motion: reduce) {
  [data-folder-item-art],
  [data-folder-back],
  [data-book-open-file] { transition-duration: 1ms; }
}

/* Shared application states: controls feel like the same instrument as the shell. */
[data-app-window] button:focus-visible,
[data-app-window] input:focus-visible,
[data-app-window] select:focus-visible,
[data-app-window] textarea:focus-visible {
  outline: var(--os-focus-width) solid var(--os-accent-bright);
  outline-offset: 2px;
}

[data-app-window] button:active:not(:disabled),
[data-app-window] [role='button']:active,
[data-app-window] a:active {
  box-shadow: 1px 1px 0 var(--os-shadow);
  transform: translate(1px, 1px);
}

[data-app-window] button:disabled,
[data-app-window] input:disabled,
[data-app-window] select:disabled,
[data-app-window] textarea:disabled,
[data-app-window] [aria-disabled='true'] {
  color: var(--os-muted);
  cursor: not-allowed;
  opacity: 1;
}