/* nav.css — dots rail, back / next chevrons, mute toggle.
 *
 * Every control: 44px hit area, a much smaller visual mark centred inside it, ivory/gold
 * on a soft translucent disc, transform/opacity-only motion, visible focus ring,
 * aria-labelled (no text labels — the invitation copy arrives in a later phase).
 *
 * Chrome is kept near-invisible on purpose: no opaque plates. Legibility over the
 * artwork comes from a delicate outline + soft shadow on each mark instead, tuned per
 * tone-variant so the same marks read on both pale watercolour skies and the navy
 * night scene.
 */

.nav-layer {
  position: absolute;
  inset: 0;
  z-index: 900;
  pointer-events: none; /* only the controls themselves take input */
}

/* --------------------------------------------------------- shared control */

.nav-btn {
  position: absolute;
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  color: var(--ivory);
  cursor: pointer;
  pointer-events: auto;
  opacity: 1;
  transform: translate3d(0, 0, 0) scale(1);
  transition:
    opacity var(--dur-sm) var(--ease-out),
    transform var(--dur-sm) var(--ease-out);
}

/* the visible disc sits on its own layer, inset from the 44px hit box, so the tap
   target stays full-size while the mark itself reads as slim and jewellery-light.
   No backdrop-filter here: stacked with the scene's own blurred controls (e.g. the
   finale's replay button) it silently failed to paint at desktop viewport widths —
   a plain tinted disc + ring reads just as soft without that risk. */
.nav-btn::before {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: rgba(251, 247, 239, 0.32);
  box-shadow:
    inset 0 0 0 1px rgba(232, 210, 162, 0.5),
    0 2px 8px rgba(58, 49, 40, 0.16);
}

.nav-btn svg {
  width: 20px;
  height: 20px;
  fill: none;
  stroke: currentColor;
  stroke-width: 2;
  stroke-linecap: round;
  stroke-linejoin: round;
  filter: drop-shadow(0 1px 2px rgba(58, 49, 40, 0.4));
}

.nav-btn:active {
  transform: translate3d(0, 0, 0) scale(0.92);
}

/* hidden = out of the tab order and non-interactive, not merely invisible */
.nav-btn[hidden] {
  display: none;
}

/* ------------------------------------------------------------ back / next */

.nav-btn--back {
  top: calc(var(--safe-t) + 14px);
  left: calc(var(--safe-l) + 14px);
}

.nav-btn--next {
  right: calc(var(--safe-r) + 14px);
  bottom: calc(var(--safe-b) + 74px); /* clears the dots rail */
  animation: ms-next-pulse 2.6s var(--ease-in-out) infinite;
}

@keyframes ms-next-pulse {
  0%,
  62%,
  100% {
    transform: translate3d(0, 0, 0) scale(1);
    opacity: 0.86;
  }
  30% {
    transform: translate3d(3px, 0, 0) scale(1.06);
    opacity: 1;
  }
}

.nav-btn--mute {
  top: calc(var(--safe-t) + 14px);
  right: calc(var(--safe-r) + 14px);
}

.nav-btn--mute .icon-on {
  display: block;
}
.nav-btn--mute .icon-off {
  display: none;
}
.nav-btn--mute[aria-pressed="false"] .icon-on {
  display: none;
}
.nav-btn--mute[aria-pressed="false"] .icon-off {
  display: block;
}

/* ------------------------------------------------------------- dots rail */

/* No plate behind the row — the rail itself is just a positioning/flex container.
   Each dot carries its own delicate outline + soft shadow (below) so the marks read
   directly against the artwork, on both pale paper/sky and the navy cocktail scene. */
.nav-rail {
  position: absolute;
  bottom: calc(var(--safe-b) + 10px);
  left: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  max-width: calc(100% - 24px); /* 7 x 44px targets clamp instead of overflowing */
  padding: 0 6px;
  transform: translateX(-50%);
  pointer-events: auto;
}

.nav-rail__list {
  display: flex;
  align-items: center;
  max-width: 100%;
  margin: 0;
  padding: 0;
  list-style: none;
}

/* the <li> is the flex item, so it carries the shrink budget; the button fills it */
.nav-rail__list > li {
  display: flex;
  flex: 0 1 auto;
  min-width: 0;
}

/* 44x44 hit area, 8px visual mark. Shrinks (never overflows) below ~320px wide. */
.dot {
  display: grid;
  place-items: center;
  width: 44px;
  min-width: 26px;
  max-width: 100%;
  height: 44px;
  padding: 0;
  border: 0;
  background: none;
  cursor: pointer;
}

.dot__mark {
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 999px;
  background: rgba(251, 247, 239, 0.5);
  box-shadow: 0 0 0 1px rgba(58, 49, 40, 0.2);
  transform: scale(1);
  transform-origin: center;
  transition:
    transform var(--dur-md) var(--ease-soft),
    background-color var(--dur-md) var(--ease-out),
    box-shadow var(--dur-md) var(--ease-out),
    opacity var(--dur-md) var(--ease-out);
}

/* visited (unlocked, tappable) — soft ivory with a delicate ink outline so it keeps a
   crisp edge even against pale paper/sky, where a plain ivory fill would nearly vanish */
.dot[data-state="visited"] .dot__mark {
  background: var(--ivory);
  box-shadow:
    0 0 0 1px rgba(58, 49, 40, 0.32),
    0 1px 3px rgba(58, 49, 40, 0.22);
}

/* current — elongated. scaleX on an 8px circle rather than a width animation:
   width is a layout property and must never be animated. At this size the resulting
   ellipse is visually indistinguishable from a stadium.
   Fill is the deeper --gold (not --gold-hi): pale champagne alone is too close in
   value to the paper/sky to read as "active" without the old dark plate behind it. */
.dot[data-state="current"] .dot__mark {
  background: var(--gold);
  box-shadow:
    0 0 0 1px rgba(58, 49, 40, 0.18),
    0 0 7px rgba(232, 210, 162, 0.7);
  transform: scaleX(2.6);
}

/* locked — dim and inert (the <button> is `disabled`, so it is out of the tab order).
   Left without an outline on purpose: these are future scenes, not yet worth the eye. */
.dot[data-state="locked"] {
  cursor: default;
}

.dot[data-state="locked"] .dot__mark {
  background: rgba(251, 247, 239, 0.3);
  box-shadow: none;
  opacity: 0.55;
  transform: scale(0.72);
}

.dot:focus-visible {
  border-radius: 12px;
}

/* night scenes (cocktail): ink reads as nothing against navy, so the outline/glow
   flips to gold-on-navy instead of dropping legibility support altogether. */
.stage.is-tone-dark .nav-btn::before {
  background: rgba(13, 42, 82, 0.34);
  box-shadow:
    inset 0 0 0 1px rgba(232, 210, 162, 0.4),
    0 2px 10px rgba(5, 19, 51, 0.4);
}

.stage.is-tone-dark .dot__mark {
  box-shadow: 0 0 0 1px rgba(232, 210, 162, 0.3);
}

.stage.is-tone-dark .dot[data-state="visited"] .dot__mark {
  box-shadow:
    0 0 0 1px rgba(232, 210, 162, 0.4),
    0 0 5px rgba(5, 19, 51, 0.5);
}

.stage.is-tone-dark .dot[data-state="current"] .dot__mark {
  box-shadow:
    0 0 0 1px rgba(232, 210, 162, 0.55),
    0 0 9px rgba(232, 210, 162, 0.75);
}

.stage.is-tone-dark .dot[data-state="locked"] .dot__mark {
  box-shadow: none;
}