/* =========================================================================
   GianOS — Settings app styles
   Neutral surface (consumes the global accent like Messages — a brand app).
   Grouped list per platform: iOS inset-grouped tables vs Material 3 list. Hosts
   the theme toy (hue slider + preset swatches), the relocated platform switch,
   a read-only reduced-motion row, and a collapsible About specs sheet.
   OKLCH only; colors derive from base.css tokens (the accent ones are seeded).
   ========================================================================= */

/* the settings screen reads as the OS Settings app: warm-paper surface, the
   per-OS wallpaper does not bleed through (it is an app takeover). */
.settings .app-body {
  background: var(--surface);
}

/* ---- the grouped list -------------------------------------------------- */
.settings__list {
  display: flex;
  flex-direction: column;
  gap: 1.6rem;
  padding: 1.3rem 1.15rem calc(2.4rem + env(safe-area-inset-bottom));
}

/* a settings group: a labelled cluster of rows */
.settings-group { display: flex; flex-direction: column; gap: 0.55rem; }
.settings-group__h {
  font-family: var(--font-label);
  font-size: 0.72rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  text-transform: uppercase;
  color: var(--text-faint);
  padding-inline: 0.4rem;
}
.settings-group__body {
  display: flex;
  flex-direction: column;
  background: var(--surface-2);
  border: 1px solid var(--line-soft);
  border-radius: 1.1rem;
  overflow: hidden;
}

/* ---- a row ------------------------------------------------------------- */
.settings-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  padding: 0.85rem 1rem;
  min-height: 3.1rem;
}
.settings-row + .settings-row { border-top: 1px solid var(--line-soft); }
.settings-row__main { display: flex; flex-direction: column; gap: 0.12rem; min-width: 0; }
.settings-row__label {
  font-size: 0.98rem;
  font-weight: 600;
  color: var(--text);
}
.settings-row__hint {
  font-family: var(--font-label);
  font-size: 0.74rem;
  line-height: 1.3;
  color: var(--text-muted);
}
.settings-row__state {
  font-family: var(--font-label);
  font-size: 0.82rem;
  font-weight: 600;
  color: var(--text-muted);
  white-space: nowrap;
}

/* a stacked row: label above, full-width control below (the hue slider) */
.settings-row--stack { flex-direction: column; align-items: stretch; gap: 0.7rem; }
.settings-row--switch .os-switch { flex: 0 0 auto; }

/* =========================================================================
   APPEARANCE — the theme toy
   ========================================================================= */
/* hue slider: a native range input painted with an oklch hue-gradient track at
   the brand L/C so it previews the exact accent family it produces. The thumb
   is a clean accent ring. Keyboard-operable for free (native range). */
.hue-slider {
  -webkit-appearance: none;
  appearance: none;
  width: 100%;
  height: 1.5rem;
  margin: 0.1rem 0 0.2rem;
  background: transparent;
  cursor: pointer;
}
.hue-slider::-webkit-slider-runnable-track {
  height: 0.7rem;
  border-radius: 999px;
  background: var(--hue-track);
  border: 1px solid var(--line);
}
.hue-slider::-moz-range-track {
  height: 0.7rem;
  border-radius: 999px;
  background: var(--hue-track);
  border: 1px solid var(--line);
}
.hue-slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 1.35rem;
  height: 1.35rem;
  margin-top: -0.38rem;       /* center on the 0.7rem track */
  border-radius: 50%;
  background: var(--surface);
  border: 3px solid var(--accent);
  box-shadow: 0 0.2rem 0.5rem -0.2rem oklch(0.4 0.03 50 / 0.45);
  transition: transform 0.2s var(--ease);
}
.hue-slider::-moz-range-thumb {
  width: 1.35rem;
  height: 1.35rem;
  border-radius: 50%;
  background: var(--surface);
  border: 3px solid var(--accent);
  box-shadow: 0 0.2rem 0.5rem -0.2rem oklch(0.4 0.03 50 / 0.45);
  transition: transform 0.2s var(--ease);
}
.hue-slider:active::-webkit-slider-thumb { transform: scale(1.08); }
.hue-slider:active::-moz-range-thumb { transform: scale(1.08); }
.hue-slider:focus-visible { outline: none; }
.hue-slider:focus-visible::-webkit-slider-thumb { box-shadow: 0 0 0 4px var(--accent-line); }
.hue-slider:focus-visible::-moz-range-thumb { box-shadow: 0 0 0 4px var(--accent-line); }

/* ---- preset swatches --------------------------------------------------- */
.swatches {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(3.4rem, 1fr));
  gap: 0.6rem 0.5rem;
  padding: 0.2rem 0.1rem 0.4rem;
}
.swatch {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.32rem;
  padding: 0.1rem;
  border: none;
  background: none;
  font: inherit;
  cursor: pointer;
  -webkit-tap-highlight-color: transparent;
}
.swatch__chip {
  position: relative;
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  border-radius: 50%;
  background: var(--swatch);
  box-shadow: 0 0.2rem 0.6rem -0.25rem oklch(0.4 0.03 50 / 0.4), inset 0 0 0 1px oklch(1 0 0 / 0.12);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.swatch__star { color: oklch(0.985 0.01 90); font-size: 0.85rem; line-height: 1; }
.swatch__name {
  font-family: var(--font-label);
  font-size: 0.68rem;
  color: var(--text-muted);
}
.swatch:hover .swatch__chip { transform: translateY(-0.12rem); }
.swatch:active .swatch__chip { transform: scale(0.93); }
.swatch:focus-visible { outline: none; }
.swatch:focus-visible .swatch__chip { box-shadow: 0 0 0 3px var(--accent-line), inset 0 0 0 1px oklch(1 0 0 / 0.12); }
/* active preset: ring + lifted name */
.swatch[aria-pressed="true"] .swatch__chip {
  box-shadow: 0 0 0 2.5px var(--surface-2), 0 0 0 4.5px var(--accent), inset 0 0 0 1px oklch(1 0 0 / 0.12);
}
.swatch[aria-pressed="true"] .swatch__name { color: var(--text); font-weight: 600; }

/* ---- reset affordance -------------------------------------------------- */
.settings-reset {
  align-self: flex-start;
  display: inline-flex;
  align-items: center;
  gap: 0.42rem;
  margin: 0.2rem 0.1rem 0.1rem;
  padding: 0.42rem 0.8rem;
  border: 1px solid var(--accent-line);
  border-radius: 999px;
  background: var(--accent-soft);
  color: var(--accent);
  font-family: var(--font-label);
  font-size: 0.78rem;
  font-weight: 600;
  cursor: pointer;
  transition: background 0.22s var(--ease), transform 0.2s var(--ease);
}
.settings-reset:hover { background: var(--accent-line); }
.settings-reset:active { transform: scale(0.96); }
.settings-reset:focus-visible { outline: 2px solid var(--accent); outline-offset: 2px; }

/* =========================================================================
   ABOUT — a collapsible specs sheet (reuses .panel from messages.css)
   ========================================================================= */
.settings-about { width: 100%; }
.settings-about__summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 0.9rem;
  padding: 0.85rem 1rem;
  min-height: 3.1rem;
  cursor: pointer;
  list-style: none;
  -webkit-tap-highlight-color: transparent;
}
.settings-about__summary::-webkit-details-marker { display: none; }
.settings-about__summary:focus-visible { outline: 2px solid var(--accent-line); outline-offset: -2px; }
.settings-about__chev { color: var(--text-faint); transition: transform 0.25s var(--ease); flex: 0 0 auto; }
.settings-about[open] .settings-about__chev { transform: rotate(90deg); }
.settings-about__body {
  padding: 0 1rem 1rem;
  border-top: 1px solid var(--line-soft);
}
.settings-about__spec { margin-top: 0.85rem; }
.settings-about__spec dt { text-transform: lowercase; }
.settings-about__spec a { color: var(--accent); font-weight: 600; text-decoration: none; }
.settings-about__spec a:hover { text-decoration: underline; }
.settings-about__sep { color: var(--text-faint); margin: 0 0.4rem; }

/* =========================================================================
   PLATFORM SWITCH placement inside Settings
   The relocated .os-switch--settings sits as a compact segmented control in its
   row. The desktop stage switch (.os-switch--stage) keeps its base.css
   placement; here we only style the in-app instance.
   ========================================================================= */
.os-switch--settings {
  margin: 0;
  align-self: center;
}

/* =========================================================================
   PER-OS list skinning
   iOS: inset grouped tables (rounded group cards, hairline insets). Android:
   Material list (flatter, larger touch targets, tonal surfaces).
   ========================================================================= */
/* iOS inset grouped look — already close to the default; soften the radius and
   lean on the warm surface. */
body[data-os="ios"] .settings-group__body {
  border-radius: 1.15rem;
  background: var(--surface);
  border: 1px solid var(--line);
}
body[data-os="ios"] .settings-group__h {
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

/* Android Material list — tonal surface, flatter rows, sentence-case group head */
body[data-os="android"] .settings-group__body {
  border-radius: 1.4rem;
  background: var(--m3-surface-container);
  border: 1px solid transparent;
}
body[data-os="android"] .settings-row + .settings-row,
body[data-os="android"] .settings-about__body { border-top-color: var(--m3-outline); }
body[data-os="android"] .settings-group__h {
  text-transform: none;
  letter-spacing: 0;
  font-size: 0.82rem;
  color: var(--m3-on-primary-container);
}

/* =========================================================================
   reduced motion: the slider thumb + chips rest static (no transitions). The
   slider stays fully operable (it is a native range — value changes are not
   animations). About chevron snaps instead of rotating with a transition.
   ========================================================================= */
@media (prefers-reduced-motion: reduce) {
  .hue-slider::-webkit-slider-thumb,
  .hue-slider::-moz-range-thumb,
  .swatch__chip,
  .settings-reset,
  .settings-about__chev { transition: none; }
}