/* App shell, layers, typography defaults, buttons, sheets, top bar, debug. */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  height: 100%;
  background: var(--night);
  overscroll-behavior: none;
  -webkit-text-size-adjust: 100%;
  text-size-adjust: 100%;
  font-size: calc(100% * var(--fontscale, 1));
}

body {
  margin: 0;
  height: 100vh;
  height: 100dvh;
  overflow: hidden;
  overscroll-behavior: none;
  background: var(--night);
  color: var(--text);
  font-family: var(--font-body);
  font-size: var(--fs-body);
  line-height: var(--lh-body);
  font-weight: 400;
  font-optical-sizing: auto;
  font-variation-settings: "SOFT" 80, "WONK" 0;
  -webkit-font-smoothing: antialiased;
  text-rendering: optimizeLegibility;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
  -webkit-user-select: none;
}

html[lang="ar"] body {
  font-family: var(--font-arabic);
  font-variation-settings: normal;
}

h1,
h2,
h3,
p {
  margin: 0;
  overflow-wrap: break-word;
}

img,
svg,
canvas,
video {
  display: block;
  max-width: 100%;
}

button {
  font: inherit;
  color: inherit;
}

a {
  color: var(--candle);
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

:focus-visible {
  outline: none;
  box-shadow: var(--ring);
}

/* ---------- Shell and layers ---------- */

.app {
  position: fixed;
  inset: 0;
  height: 100vh;
  height: 100dvh;
  display: grid;
  grid-template-rows: auto minmax(0, 1fr);
  padding: var(--safe-top) var(--safe-right) var(--safe-bottom) var(--safe-left);
  background: radial-gradient(120% 70% at 50% 0%, var(--velvet), var(--night) 70%);
  overflow: hidden;
}

.layer {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.layer--ambient {
  z-index: var(--z-ambient);
}

.layer--light {
  z-index: var(--z-light);
  background: radial-gradient(
    72% 52% at 50% 42%,
    color-mix(in oklab, var(--candle) 34%, transparent),
    color-mix(in oklab, var(--candle) 12%, transparent) 42%,
    transparent 74%
  );
  opacity: var(--light);
  transition: opacity 700ms var(--ease-out);
}

.light-live .layer--light {
  transition: none;
}

.layer--particles {
  z-index: var(--z-particles);
}

.layer--grain {
  z-index: var(--z-grain);
  opacity: 0.045;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='220' height='220'%3E%3Cfilter id='n'%3E%3CfeTurbulence type='fractalNoise' baseFrequency='0.85' numOctaves='2' stitchTiles='stitch'/%3E%3CfeColorMatrix values='0 0 0 0 1 0 0 0 0 1 0 0 0 0 1 0 0 0 1 0'/%3E%3C/filter%3E%3Crect width='100%25' height='100%25' filter='url(%23n)'/%3E%3C/svg%3E");
  background-size: 220px 220px;
}

.layer--vignette {
  z-index: var(--z-grain);
  background: radial-gradient(
    115% 85% at 50% 45%,
    transparent 52%,
    color-mix(in oklab, var(--night-deep) 70%, transparent) 100%
  );
}

/* Scene transition veil: the room dims and a warm glow passes through. */
.veil {
  position: absolute;
  inset: 0;
  z-index: var(--z-veil);
  pointer-events: none;
  background: var(--night);
  opacity: 0;
  overflow: hidden;
}

.veil__glow {
  position: absolute;
  left: -20%;
  right: -20%;
  top: 20%;
  height: 60%;
  background: radial-gradient(
    50% 50% at 50% 50%,
    color-mix(in oklab, var(--candle) 42%, transparent),
    color-mix(in oklab, var(--candle) 10%, transparent) 50%,
    transparent 75%
  );
  transform: translateY(45%);
  will-change: transform;
}

.veil.is-in {
  transition: opacity 280ms var(--ease-in);
  opacity: 1;
}

.veil.is-in .veil__glow {
  transition: transform 640ms var(--ease-in-out);
  transform: translateY(-45%);
}

.veil.is-out {
  transition: opacity 360ms var(--ease-out);
  opacity: 0;
}

.veil.is-block {
  pointer-events: auto;
}

/* ---------- Top bar: fairy lights and sound ---------- */

.topbar {
  position: relative;
  z-index: var(--z-topbar);
  height: var(--topbar-h);
  display: grid;
  grid-template-columns: minmax(0, 1fr) var(--tap);
  align-items: center;
  column-gap: var(--space-2);
  padding-inline: var(--gutter) var(--space-2);
}

.lights {
  height: 100%;
  min-width: 0;
  display: block;
}

.lights svg {
  width: 100%;
  height: 100%;
  overflow: visible;
  transform-origin: 50% 0;
  transform: rotate(calc(var(--tilt-x) * 1.4deg));
}

.lights .wire {
  fill: none;
  stroke: var(--candle-line);
  stroke-width: 1.1;
}

.lights .stem {
  stroke: color-mix(in oklab, var(--candle) 45%, transparent);
  stroke-width: 1;
}

.lights .halo {
  fill: url(#halo-grad);
  opacity: 0;
  transform-box: fill-box;
  transform-origin: center;
}

.lights .glass {
  fill: color-mix(in oklab, var(--text-dim) 22%, transparent);
  stroke: color-mix(in oklab, var(--text-dim) 30%, transparent);
  stroke-width: 0.6;
}

.lights .bulb--done .glass {
  fill: var(--candle);
  stroke: var(--flame-core);
}

.lights .bulb--done .halo {
  opacity: 0.75;
}

.lights .bulb--now .glass {
  fill: var(--flame-core);
  stroke: var(--flame-core);
}

.lights .bulb--now .halo {
  opacity: 1;
  animation: bulb-pulse 2.6s ease-in-out infinite;
}

.lights .bulb-hit {
  fill: transparent;
  pointer-events: none;
}

.lights.is-keepsake .bulb-hit {
  pointer-events: auto;
  cursor: pointer;
}

@keyframes bulb-pulse {
  0%,
  100% {
    opacity: 0.55;
    transform: scale(0.9);
  }
  50% {
    opacity: 1;
    transform: scale(1.12);
  }
}

.sound-toggle {
  width: var(--tap);
  height: var(--tap);
  border: 0;
  border-radius: var(--r-pill);
  background: transparent;
  color: var(--text-dim);
  display: grid;
  place-items: center;
  cursor: pointer;
  touch-action: manipulation;
}

.sound-toggle:active {
  background: var(--glass);
}

.sound-toggle svg {
  width: 24px;
  height: 24px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.7;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.sound-toggle .wave {
  transition: opacity 200ms;
}

.sound-toggle .cross {
  opacity: 0;
  transition: opacity 200ms;
}

.sound-toggle.is-muted .wave {
  opacity: 0;
}

.sound-toggle.is-muted .cross {
  opacity: 1;
}

/* ---------- Stage and scene skeleton ---------- */

.stage {
  position: relative;
  z-index: var(--z-stage);
  min-height: 0;
}

.scene {
  position: absolute;
  inset: 0;
  display: grid;
  grid-template-rows: minmax(0, 1fr) auto auto;
  row-gap: var(--space-4);
  padding: var(--space-2) var(--gutter) var(--space-3);
  justify-items: center;
  text-align: center;
}

.scene.is-entering,
.scene.is-leaving {
  will-change: opacity, transform;
}

.scene.is-entering {
  opacity: 0;
  transform: translateY(14px) scale(0.985);
}

.scene.is-visible {
  transition: opacity 460ms var(--ease-out), transform 520ms var(--ease-out);
  opacity: 1;
  transform: none;
}

.scene.is-leaving {
  transition: opacity 240ms var(--ease-in), transform 260ms var(--ease-in);
  opacity: 0;
  transform: translateY(-8px) scale(0.99);
  pointer-events: none;
}

.scene__object {
  width: 100%;
  min-height: 0;
  display: grid;
  place-items: center;
  align-self: stretch;
}

.scene__text {
  max-width: 36ch;
  display: grid;
  gap: var(--space-2);
}

.scene__actions {
  width: min(100%, 420px);
  display: grid;
  gap: var(--space-1);
  justify-items: center;
}

.prompt {
  font-size: var(--fs-lead);
  line-height: 1.35;
  color: var(--text);
  text-wrap: balance;
}

.hint {
  font-size: var(--fs-small);
  color: var(--text-dim);
  line-height: 1.4;
  text-wrap: balance;
}

.hand {
  font-family: var(--font-hand);
  font-weight: 500;
  line-height: 1.25;
}

html[lang="ar"] .hand,
.hand[lang="ar"],
.hand:lang(ar) {
  font-family: var(--font-arabic-hand);
  font-weight: 400;
}

.arabic {
  font-family: var(--font-arabic-hand);
  direction: rtl;
  unicode-bidi: isolate;
}

.tabular {
  font-variant-numeric: tabular-nums;
}

/* ---------- Buttons ---------- */

.btn {
  appearance: none;
  border: 0;
  margin: 0;
  width: 100%;
  min-height: var(--btn-h);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--r-pill);
  font-family: var(--font-display);
  font-size: var(--fs-body);
  font-weight: 500;
  line-height: 1.25;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  cursor: pointer;
  touch-action: manipulation;
  transition: transform 160ms var(--ease-out), background-color 200ms, box-shadow 200ms, opacity 300ms;
}

html[lang="ar"] .btn {
  font-family: var(--font-arabic);
}

.btn--primary {
  background: var(--candle);
  color: var(--ink);
  box-shadow: inset 0 1px 0 color-mix(in oklab, var(--flame-core) 70%, transparent),
    0 10px 28px -10px color-mix(in oklab, var(--candle) 60%, transparent);
}

.btn--primary:active {
  transform: scale(0.97);
  background: color-mix(in oklab, var(--candle) 90%, var(--ink));
}

.btn--secondary {
  background: var(--glass);
  color: var(--text);
  box-shadow: inset 0 0 0 1px var(--glass-edge);
}

.btn--secondary:active {
  transform: scale(0.97);
}

.btn--link {
  background: transparent;
  color: var(--text-dim);
  min-height: var(--tap);
  padding-block: var(--space-2);
  font-weight: 400;
  text-decoration: underline;
  text-decoration-color: color-mix(in oklab, var(--text-dim) 45%, transparent);
  text-underline-offset: 4px;
}

.btn--link:active {
  color: var(--text);
}

.btn[disabled] {
  opacity: 0.45;
  pointer-events: none;
}

.btn--quiet {
  opacity: 0.85;
}

/* ---------- Bottom sheet ---------- */

.sheet-backdrop {
  position: fixed;
  inset: 0;
  z-index: var(--z-sheet);
  background: color-mix(in oklab, var(--night-deep) 62%, transparent);
  opacity: 0;
  transition: opacity 240ms var(--ease-out);
}

.sheet-backdrop.is-open {
  opacity: 1;
}

.sheet {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: var(--space-5) var(--gutter) calc(var(--safe-bottom) + var(--space-4));
  background: color-mix(in oklab, var(--velvet) 82%, var(--night));
  color: var(--text);
  border-radius: var(--r-sheet) var(--r-sheet) 0 0;
  box-shadow: 0 -12px 40px -16px var(--night-deep);
  display: grid;
  gap: var(--space-4);
  justify-items: center;
  text-align: center;
  transform: translateY(100%);
  transition: transform 360ms var(--ease-out);
}

.sheet-backdrop.is-open .sheet {
  transform: none;
}

.sheet::before {
  content: "";
  width: 40px;
  height: 4px;
  border-radius: 2px;
  background: var(--glass-edge);
}

.sheet__title {
  font-size: var(--fs-lead);
  line-height: 1.35;
  font-weight: 400;
  text-wrap: balance;
}

.sheet__body {
  color: var(--text-dim);
  font-size: var(--fs-body);
  max-width: 36ch;
}

.sheet__actions {
  width: min(100%, 420px);
  display: grid;
  gap: var(--space-2);
}

/* ---------- Loading glow ---------- */

.loading {
  position: fixed;
  inset: 0;
  z-index: var(--z-loading);
  background: var(--night);
  display: grid;
  place-items: center;
  transition: opacity 520ms var(--ease-out);
}

.loading::before {
  content: "";
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--candle-glow), transparent 68%);
  animation: breathe 1.9s ease-in-out infinite;
}

.loading.is-done {
  opacity: 0;
  pointer-events: none;
}

@keyframes breathe {
  0%,
  100% {
    transform: scale(0.85);
    opacity: 0.6;
  }
  50% {
    transform: scale(1.05);
    opacity: 1;
  }
}

/* ---------- Orientation guard (pure CSS) ---------- */

.guard {
  position: fixed;
  inset: 0;
  z-index: var(--z-guard);
  display: none;
  place-items: center;
  place-content: center;
  gap: var(--space-4);
  background: var(--night);
  color: var(--text);
  text-align: center;
  padding: var(--gutter);
}

.guard__phone {
  width: 34px;
  height: 58px;
  border: 2.5px solid var(--candle);
  border-radius: 7px;
  transform: rotate(-90deg);
  animation: guard-turn 2.2s var(--ease-in-out) infinite;
}

@keyframes guard-turn {
  0%,
  20% {
    transform: rotate(-90deg);
  }
  60%,
  100% {
    transform: rotate(0deg);
  }
}

@media (orientation: landscape) and (max-height: 500px) {
  .guard {
    display: grid;
  }
}

/* ---------- Debug panel (?debug=1 only) ---------- */

.debug {
  position: fixed;
  left: 8px;
  top: calc(var(--safe-top) + var(--topbar-h) + 4px);
  z-index: var(--z-debug);
  max-width: min(92vw, 360px);
  max-height: 55vh;
  overflow: auto;
  padding: 8px 10px;
  border-radius: 8px;
  background: rgba(10, 4, 14, 0.82);
  color: #e8dcd0;
  font: 12px/1.35 ui-monospace, Menlo, Consolas, monospace;
  user-select: text;
  -webkit-user-select: text;
  touch-action: pan-y;
  overscroll-behavior: contain;
}

.debug.is-collapsed .debug__body {
  display: none;
}

.debug__toggle {
  appearance: none;
  border: 0;
  background: transparent;
  color: var(--candle);
  font: inherit;
  padding: 4px 0;
  cursor: pointer;
}

.debug__row {
  display: flex;
  justify-content: space-between;
  gap: 12px;
}

.debug__row b {
  font-weight: 500;
  color: var(--candle);
}

.debug__section {
  margin-top: 6px;
  padding-top: 6px;
  border-top: 1px solid rgba(243, 185, 95, 0.25);
}

.debug input[type="range"] {
  width: 100%;
}

/* ---------- Reduced motion and still mode ---------- */

html.reduced .scene.is-entering {
  transform: none;
}

html.reduced .scene.is-visible,
html.reduced .scene.is-leaving {
  transform: none;
  transition-duration: 260ms;
}

html.reduced .lights svg {
  transform: none;
}

html.reduced .lights .bulb--now .halo {
  animation: none;
}

html.reduced .veil__glow {
  display: none;
}

html.still *,
html.still *::before,
html.still *::after {
  animation-play-state: paused !important;
  transition: none !important;
}