:root,
[data-theme="light"] {
  --bg-void: hsl(270 30% 95%);
  --bg-primary: hsl(270 35% 97%);
  --bg-elevated: hsl(270 25% 93%);
  --bg-surface: hsl(270 20% 89%);
  --bg-glass: hsl(270 30% 96% / 0.85);
  --bg-soft: hsl(270 40% 90%);
  --bg-contrast: hsl(270 20% 75%);
  --bg-strong: hsl(270 24% 70%);

  --text-primary: hsl(270 40% 12%);
  --text-secondary: hsl(270 15% 35%);
  --text-muted: hsl(270 15% 60%);

  --accent-h: 265;
  --accent: hsl(var(--accent-h) 65% 54%);
  --light-accent: hsl(var(--accent-h) 65% 75%);
  --accent-soft: hsl(var(--accent-h) 55% 55% / 0.12);
  --accent-glow: hsl(var(--accent-h) 75% 55% / 0.4);

  --valid: hsl(160 35% 45%);
  --valid-glow: hsl(160 40% 41% / 0.4);
  --invalid: hsl(355 45% 45%);
  --warning: hsl(42 80% 50%);

  --tile-bg: hsl(270 40% 99%);
  --tile-border: hsl(270 20% 81%);
  --tile-shadow: hsl(270 30% 88% / 0.15);
  --tile-number: hsl(270 40% 15%);

  --divider: hsl(270 20% 88%);
  --grid-cell-bg: hsl(270 25% 95%);
  --grid-bg: hsl(270 25% 93%);
  --grid-border: hsl(270 25% 84%);
  --grid-shadow: hsl(270 35% 55% / 0.1);

  --shockwave-color: hsl(var(--accent-h) 65% 55%);


}

[data-theme="dark"] {
  --bg-void: hsl(270 25% 5%);
  --bg-primary: hsl(270 20% 6%);
  --bg-elevated: hsl(270 20% 8%);
  --bg-surface: hsl(270 18% 12%);
  --bg-soft: hsl(270 40% 15%);
  --bg-glass: hsl(270 20% 8% / 0.9);
  --bg-contrast: hsl(270 20% 20%);
  --bg-strong: hsl(270 24% 24%);

  --text-primary: hsl(270 30% 94%);
  --text-secondary: hsl(270 10% 65%);
  --text-muted: hsl(270 10% 35%);

  --accent-h: 270;
  --accent: hsl(var(--accent-h) 60% 70%);
  --light-accent: hsl(var(--accent-h) 40% 50%);
  --accent-soft: hsl(var(--accent-h) 50% 65% / 0.15);
  --accent-glow: hsl(var(--accent-h) 60% 65% / 0.3);

  --valid: hsl(160 40% 48%);
  --valid-glow: hsl(160 45% 48% / 0.35);
  --invalid: hsl(355 50% 48%);
  --warning: hsl(42 70% 58%);

  --tile-bg: hsl(270 18% 12%);
  --tile-border: hsl(270 15% 20%);
  --tile-shadow: hsl(270 30% 2% / 0.5);
  --tile-number: hsl(270 25% 92%);

  --divider: hsl(270 15% 16%);
  --grid-cell-bg: hsl(270 18% 8%);
  --grid-bg: hsl(270 18% 10%);
  --grid-border: hsl(270 12% 14%);
  --grid-shadow: hsl(270 30% 0% / 0.35);

  --shockwave-color: hsl(var(--accent-h) 65% 60%);


}

:root {
  --space-2xs: 0.125rem;
  --space-xs: 0.25rem;
  --space-sm: 0.5rem;
  --space-md: 0.875rem;
  --space-lg: 1.25rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;

  --ease-out-expo: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-out-back: cubic-bezier(0.34, 1.4, 0.64, 1);
  --ease-out-quart: cubic-bezier(0.25, 1, 0.5, 1);
  --ease-spring: cubic-bezier(0.175, 0.885, 0.32, 1.275);
  --ease-snappy: cubic-bezier(0.2, 0, 0, 1);
  --ease-luxe: cubic-bezier(0.4, 0, 0.2, 1);

  --duration-instant: 80ms;
  --duration-fast: 120ms;
  --duration-normal: 320ms;
  --duration-slow: 500ms;

  --z-base: 1;
  --z-tile: 10;
  --z-tile-dragging: 100;
  --z-overlay: 500;

  --grid-rows: 8;
  --grid-cols: 8;

  --font-display: 'Instrument Serif', 'Playfair Display', Georgia, serif;
  --font-body: system-ui, -apple-system, 'Segoe UI', sans-serif;

  /* Default / Fallback Sizing */
  --tile-size: 3rem;
  --tile-radius: 0.5rem;
  --grid-gap: 6px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;

  &:focus-visible {
    outline-color: unset;
  }
}

html,
body {
  width: 100%;
  height: 100%;
  overflow: hidden;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
}

body {
  font-family: var(--font-body);
  background: var(--bg-void);
  color: var(--text-primary);
  user-select: none;
  -webkit-user-select: none;
  -webkit-font-smoothing: antialiased;
  transition: background var(--duration-slow) var(--ease-luxe),
    color var(--duration-slow) var(--ease-luxe);
}

.is-remodeling,
.is-remodeling *,
.is-remodeling *::before,
.is-remodeling *::after {
  transition: none !important;
}

.app {
  display: grid;
  grid-template-rows: auto 1fr auto auto;
  grid-template-areas:
    "header"
    "board"
    "controls"
    "rack";
  height: 100%;
  max-height: 100%;
  overflow: hidden;
  background: var(--bg-primary);
  transition: grid-template-rows var(--duration-normal) var(--ease-snappy);
}

.header {
  grid-area: header;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-sm);
  background: var(--bg-glass);
  backdrop-filter: blur(20px) saturate(1.2);
  -webkit-backdrop-filter: blur(20px) saturate(1.2);
  border-bottom: 1px solid var(--divider);
  z-index: 10;
}

.icon-btn {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background: transparent;
  border: 1px solid transparent;
  top: 1px;
  border-radius: 50%;
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out-quart);
  position: relative;
}

.icon-btn::before {
  content: '';
  position: absolute;
  inset: -2px;
  border-radius: inherit;
  background: var(--accent-soft);
  opacity: 0;
  transform: scale(0.8);
  transition: all var(--duration-fast) var(--ease-out-quart);
}

@media (pointer: fine) and (hover: hover) {
  .icon-btn:hover::before {
    opacity: 1;
    transform: scale(1);
  }
}

.icon-btn:active {
  transform: scale(0.92);
}

.icon-btn svg {
  width: 18px;
  height: 18px;
  stroke: var(--text-secondary);
  transition: stroke var(--duration-fast), transform var(--duration-fast);
  position: relative;
  z-index: 1;
}

@media (pointer: fine) and (hover: hover) {
  .icon-btn:hover svg {
    stroke: var(--accent);
  }
}

.game-container {
  grid-area: board;
  display: grid;
  place-items: center;
  padding: var(--space-xl);
  background: var(--bg-primary);
  overflow: auto;
  min-height: 0;
  position: relative;
}



.grid-wrapper {
  position: relative;
}

.game-grid {
  display: grid;
  grid-template-columns: repeat(var(--grid-cols, 8), var(--tile-size));
  grid-template-rows: repeat(var(--grid-rows, 8), var(--tile-size));
  gap: var(--grid-gap);
  padding: var(--space-lg);
  background: var(--grid-bg);
  border-radius: calc(var(--tile-radius) * 2.5 + var(--space-lg));
  border: 1px solid var(--grid-border, var(--divider));
  position: relative;
  touch-action: none;
  box-shadow:
    0 2px 4px var(--grid-shadow, hsl(270 30% 60% / 0.06)),
    0 12px 32px var(--grid-shadow, hsl(270 30% 60% / 0.06));
}



.grid-cell {
  position: relative;
  border-radius: var(--tile-radius);
  background: var(--grid-cell-bg);
  transition: all var(--duration-fast) var(--ease-out-quart);
  border: 1.5px solid transparent;
}



.grid-cell--valid-target {
  background: hsl(var(--accent-h) 45% 50% / 0.1);
  border-color: hsl(var(--accent-h) 55% 65% / 0.5);
}

.controls-bar {
  grid-area: controls;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-sm) var(--space-xl);
  padding-right: calc(var(--space-xl) - 0.5rem);
  background: var(--bg-elevated);
  border-top: 1px solid var(--divider);
  border-bottom: 1px solid var(--divider);
  gap: var(--space-lg);
}

.remaining-counter {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.remaining-count {
  font-family: var(--font-display);
  font-size: 1.75rem;
  font-weight: 400;
  color: var(--text-primary);
  line-height: 1;
  min-width: 1.5ch;
  transition: color var(--duration-normal) var(--ease-luxe),
    transform var(--duration-fast) var(--ease-out-back);
}

.remaining-count[data-state="valid"] {
  color: var(--valid);
}

.remaining-count[data-state="victory"] {
  color: var(--accent);
  animation: count-glow 1.5s ease-in-out infinite;
}

@keyframes count-glow {

  0%,
  100% {
    filter: drop-shadow(0 0 0 transparent);
  }

  50% {
    filter: drop-shadow(0 0 8px var(--accent-glow));
  }
}

.remaining-label {
  font-size: 0.8125rem;
  color: var(--text-muted);
  letter-spacing: 0.04em;
  text-transform: lowercase;
}

.toolbar {
  display: flex;
  gap: var(--space-xs);
}

.tool-btn {
  display: grid;
  place-items: center;
  width: 2.5rem;
  height: 2.5rem;
  background: transparent;
  border: 1px solid transparent;
  border-radius: var(--tile-radius);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-out-quart);
  position: relative;
}

.tool-btn::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  background: var(--accent-soft);
  opacity: 0;
  transition: opacity var(--duration-fast);
}

@media (pointer: fine) and (hover: hover) {
  .tool-btn:hover::before {
    opacity: 1;
  }
}

.tool-btn:active {
  transform: scale(0.92);
}

.tool-btn svg {
  width: 18px;
  height: 18px;
  stroke: var(--text-secondary);
  transition: stroke var(--duration-fast);
  position: relative;
  z-index: 1;
}

@media (pointer: fine) and (hover: hover) {
  .tool-btn:hover svg {
    stroke: var(--accent);
  }
}

.selection-rect {
  position: absolute;
  border: 1.5px dashed var(--accent);
  background: var(--accent-soft);
  pointer-events: none;
  z-index: calc(var(--z-tile-dragging) + 5);
  border-radius: var(--tile-radius);
}

.tile.tile--selected {
  border-color: hsl(var(--accent-h) 55% 60% / 0.6);
}

.tile.tile--selected.tile--dragging {
  border-color: var(--accent);
  box-shadow: 0 6px 16px hsl(0 0% 0% / 0.12);
}

.scroll-fade-wrap {
  grid-area: rack;
  position: relative;
  max-height: 24vh;
}

.scroll-fade-wrap > .rack-container {
  grid-area: unset;
  max-height: 100%;
  height: 100%;
}

.rack-container {
  grid-area: rack;
  padding: var(--space-md) var(--space-xl) var(--space-lg);
  background: var(--bg-elevated);
  position: relative;
  max-height: 24vh;
  overflow-y: auto;
  overflow-x: hidden;
}

.scroll-fade {
  position: absolute;
  left: 0;
  right: 0;
  height: 2rem;
  pointer-events: none;
  opacity: 0;
  z-index: 20;
  transition: opacity 80ms ease-out;
}

.scroll-fade--top {
  top: 0;
  background: linear-gradient(to bottom, var(--bg-elevated) 0%, transparent 100%);
}

.scroll-fade--bottom {
  bottom: 0;
  background: linear-gradient(to top, var(--bg-elevated) 0%, transparent 100%);
}

.scroll-fade.visible {
  opacity: 1;
}

.tile-rack {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  align-items: center;
  padding: var(--space-sm) 0;
}

.tile {
  position: relative;
  display: grid;
  place-items: center;
  width: var(--tile-size);
  height: var(--tile-size);
  background: var(--tile-bg);
  border: 1px solid var(--tile-border);
  border-radius: var(--tile-radius);
  cursor: grab;
  touch-action: none;
  transition:
    transform var(--duration-fast) var(--ease-out-back),
    border-color var(--duration-fast) var(--ease-out-quart),
    box-shadow var(--duration-normal) var(--ease-luxe),
    opacity var(--duration-fast);
  will-change: transform;
  z-index: var(--z-tile);
  box-shadow:
    0 1px 1px var(--tile-shadow),
    0 2px 4px var(--tile-shadow);
}

.tile--placed {
  box-shadow: none;
}






.tile__number {
  font-family: var(--font-display);
  font-size: calc(var(--tile-size) * 0.52);
  font-weight: 500;
  color: var(--tile-number);
  z-index: 1;
  transition: all var(--duration-fast);
}

@media (pointer: fine) and (hover: hover) {
  .tile:hover:not(.tile--placed) {
    transform: translateY(-2px);
    border-color: var(--accent);
  }
}

.tile:active:not(.tile--dragging) {
  cursor: grabbing;
}

.tile--dragging {
  z-index: var(--z-tile-dragging);
  transition: none;
  cursor: grabbing;
}

.tile--ghost {
  visibility: hidden;
  pointer-events: none;
}

.tile-drag-preview {
  position: fixed;
  pointer-events: none;
  z-index: var(--z-tile-dragging);
  box-shadow:
    0 20px 40px var(--tile-shadow),
    0 8px 16px hsl(0 0% 0% / 0.12);
  border-color: var(--accent) !important;
  transition: border-color var(--duration-fast), box-shadow var(--duration-fast), opacity var(--duration-fast);
}

.tile-drag-preview--swapping {
  border: 1.5px dashed var(--accent) !important;
}

.tile-drag-preview--invalid,
.tile--dragging.tile--invalid-drop {
  border-color: var(--invalid) !important;
  box-shadow:
    0 20px 40px var(--tile-shadow),
    0 8px 16px hsl(0 0% 0% / 0.12);
}

.tile--swap-target {
  border: 1.5px dashed var(--accent) !important;
}

.tile--valid .tile__number {
  color: var(--valid);
}

.tile--block-error .tile__number {
  color: var(--invalid);
}

.tile--impossible .tile__number {
  color: var(--invalid);
}

.tile--snapping {
  animation: snap-in 0.32s;
}

.tile--victory {
  animation: victory-tile 0.7s var(--ease-out-back) both;
}

.tile--entering {
  animation: tile-enter 0.3s var(--ease-out-back) both;
}

@keyframes snap-in {
  0% {
    transform: scale(1.02);
  }

  30% {
    transform: scale(0.96);
  }

  55% {
    transform: scale(1.015);
  }

  100% {
    transform: scale(1);
  }
}

@keyframes victory-tile {
  0% {
    transform: scale(1);
  }

  25% {
    transform: scale(1.12);
  }

  50% {
    transform: scale(0.96);
  }

  100% {
    transform: scale(1);
  }
}

@keyframes tile-enter {
  0% {
    opacity: 0;
    transform: scale(0.8) translateY(12px);
  }

  100% {
    opacity: 1;
    transform: scale(1) translateY(0);
  }
}

.particle-burst-canvas {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: calc(var(--z-tile-dragging) + 10);
  border-radius: inherit;
  will-change: transform;
  contain: strict;
  transform: translateZ(0);
}

@keyframes victory-pulse-dot {

  0%,
  100% {
    box-shadow: 0 0 0 0 var(--accent-glow);
    transform: scale(1);
  }

  50% {
    box-shadow: 0 0 16px 6px var(--accent-glow);
    transform: scale(1.25);
  }
}

.confetti {
  position: fixed;
  width: 10px;
  height: 10px;
  background: var(--accent);
  border-radius: 2px;
  pointer-events: none;
  z-index: var(--z-overlay);
  animation: confetti-fall 3s cubic-bezier(0.25, 0.46, 0.45, 0.94) forwards;
}

.confetti:nth-child(odd) {
  background: var(--valid);
  animation-duration: 3.2s;
}

.confetti:nth-child(3n) {
  background: var(--warning);
  width: 8px;
  height: 8px;
  border-radius: 50%;
}

.confetti:nth-child(4n) {
  background: hsl(25 50% 60%);
  width: 6px;
  height: 12px;
}

@keyframes confetti-fall {
  0% {
    transform: translateY(-10vh) rotate(0deg) scale(1);
    opacity: 1;
  }

  80% {
    opacity: 1;
  }

  100% {
    transform: translateY(100vh) rotate(720deg) scale(0.4);
    opacity: 0;
  }
}

::-webkit-scrollbar {
  width: 5px;
  height: 5px;
}

::-webkit-scrollbar-thumb {
  background: var(--bg-contrast);
  border-radius: 3px;
}

@media (pointer: fine) and (hover: hover) {
  ::-webkit-scrollbar-thumb:hover {
    background: var(--bg-strong);
  }
}

@media (orientation: portrait) {
  :root {
    --space-lg: 1rem;
    --space-xl: 1.5rem;


    --tile-h-limit: calc((100vh - 18rem) / 9);
    --tile-w-limit: calc((100vw - 2rem) / 8);

    --tile-size: clamp(1.6rem, min(var(--tile-w-limit), var(--tile-h-limit)), 3rem);
    --grid-gap: clamp(4px, 0.85vmin, 6px);
  }

  .rack-container {
    max-height: 24vh;
  }
}

@media (orientation: landscape) {
  :root {

    --tile-h-limit: calc((100vh - 14rem) / 9);
    --tile-w-limit: calc((100vw - 4rem) / 10);

    --tile-size: clamp(1.6rem, min(var(--tile-w-limit), var(--tile-h-limit)), 3.1rem);
    --grid-gap: clamp(3px, 0.8vh, 7px);
  }

  .rack-container {
    max-height: 20vh;
  }
}

@media (max-height: 720px) {
  :root {
    --space-md: 0.5rem;
    --space-lg: 0.75rem;
    --space-xl: 1rem;
    --tile-radius: 0.375rem;
  }

  .header,
  .controls-bar {
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
  }

  .remaining-count {
    font-size: 1.5rem;
  }

  .icon-btn,
  .tool-btn {
    width: 2.25rem;
    height: 2.25rem;
  }

  .rack-container {
    max-height: 18vh;
  }
}

@media (min-width: 1024px) and (orientation: landscape) {
  :root {
    --tile-h-limit: calc((100vh - 15rem) / 9);
    --tile-w-limit: calc((100vw - 5rem) / 10);

    --tile-size: clamp(1.6rem, min(var(--tile-w-limit), var(--tile-h-limit)), 3rem);
  }

  .rack-container {
    max-height: 19vh;
  }
}

@media (prefers-reduced-motion: reduce) {

  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
  }
}

.page {
  position: absolute;
  width: 100%;
  height: 100%;
  left: 0;
  top: 0;
  overflow: hidden;
  will-change: transform;
  transition: transform 0.5s cubic-bezier(0.22, 1, 0.36, 1);
  background: var(--bg-void);
}

.page.game {
  background: var(--bg-primary);
}

.page-hidden {
  display: none;
}

.slide-exit-to-top {
  transform: translateY(-100%);
}

.slide-enter-from-bottom {
  transform: translateY(100%);
}

.slide-exit-to-bottom {
  transform: translateY(100%);
}

.slide-enter-from-top {
  transform: translateY(-100%);
}

.slide-center {
  transform: translateY(0);
}


.home-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  background: var(--bg-void);
  color: var(--text-primary);
}

.page.home {
  z-index: 10;
}

.page.game {
  z-index: 20;
  background: var(--bg-primary);
}

.home-layout {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  width: 100%;
  padding: var(--space-xl);
  background: var(--bg-void);
  position: relative;
  overflow: hidden;
}

.home-layout::before {
  content: '';
  position: absolute;
  width: min(700px, 100vw);
  height: min(700px, 100vw);
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  background: radial-gradient(circle, hsl(var(--accent-h) 50% 50% / 0.15) 0%, transparent 60%);
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.app-toolbar {
  position: absolute;
  top: 0;
  right: 0;
  padding: var(--space-lg);
  display: flex;
  gap: var(--space-sm);
  z-index: 50;
}

.logo-container {
  margin-bottom: var(--space-xl);
  position: relative;
  z-index: 10;
  text-align: center;
}

.logo-container .logo {
  font-family: var(--font-display);
  font-weight: 400;



  font-size: clamp(2.75rem, 10vw, 4.5rem);
  background: linear-gradient(90deg,
      var(--text-primary) 0%,
      var(--text-primary) 10%,
      hsl(var(--accent-h) 75% 45%) 50%,
      hsl(var(--accent-h) 85% 65%) 70%,
      hsl(var(--accent-h) 75% 45%) 80%,
      hsl(var(--accent-h) 75% 35%) 100%);
  -webkit-background-clip: text;
  background-clip: text;
  -webkit-text-fill-color: transparent;
  position: relative;
}


.start-assembly {
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: 340px;
  position: relative;
  z-index: 10;
}

.hero-play-btn {
  position: relative;
  z-index: 10;
  width: 100%;
  min-height: 92px;
  background: var(--tile-bg);
  border: 1.5px solid var(--tile-border);
  border-radius: var(--tile-radius) var(--tile-radius) 3px 3px;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  transition: box-shadow var(--duration-normal) var(--ease-luxe),
    border-color var(--duration-fast) var(--ease-out-quart);
  box-shadow: 0 1px 1px var(--tile-shadow),
    0 2px 6px var(--tile-shadow);
}

.hero-play-btn::before {
  content: '';
  position: absolute;
  top: 10px;
  left: 10px;
  width: 7px;
  height: 7px;
  background: transparent;
  border: 1.5px solid var(--tile-border);
  border-radius: 1.5px;
  transform: rotate(45deg);
  opacity: 0.4;
  transition: border-color var(--duration-fast),
    opacity var(--duration-fast);
}

.hero-play-btn::after {
  content: '';
  position: absolute;
  top: 10px;
  right: 10px;
  width: 7px;
  height: 7px;
  background: transparent;
  border: 1.5px solid var(--tile-border);
  border-radius: 1.5px;
  transform: rotate(45deg);
  opacity: 0.4;
  transition: border-color var(--duration-fast),
    opacity var(--duration-fast);
}

.hero-play-btn:hover {
  border-color: var(--accent);
  box-shadow: 0 1px 1px var(--tile-shadow),
    0 4px 8px var(--tile-shadow),
    0 8px 16px hsl(var(--accent-h) 55% 50% / 0.025),
    0 16px 32px hsl(var(--accent-h) 50% 45% / 0.05);
}

.hero-play-btn:hover::before,
.hero-play-btn:hover::after {
  border-color: var(--accent);
  opacity: 0.65;
}

.hero-play-btn:active {
  box-shadow: 0 1px 2px var(--tile-shadow),
    0 2px 4px hsl(var(--accent-h) 30% 45% / 0.06),
    inset 0 1px 3px hsl(0 0% 0% / 0.03);
}

.hero-text {
  font-family: var(--font-display);
  font-size: clamp(2rem, 6vw, 2.5rem);
  font-style: italic;
  font-weight: 500;
  color: var(--tile-number);
  letter-spacing: -0.01em;
  transition: color var(--duration-fast) var(--ease-out-quart),
    transform var(--duration-fast) var(--ease-out-back);
  position: relative;
  z-index: 2;
}

.hero-play-btn:hover .hero-text {
  color: var(--accent);
  transform: scale(1.02);
}

.settings-attachment {
  position: relative;
  z-index: 5;
  background: var(--bg-surface);
  border: 1.5px solid var(--tile-border);
  border-top: none;
  border-radius: 0 0 var(--tile-radius) var(--tile-radius);
  padding: 1rem 1.125rem 1.25rem;
  margin-top: -1px;
  display: flex;
  flex-direction: column;
  gap: 0.875rem;
  box-shadow: 0 2px 6px var(--tile-shadow),
    0 8px 20px hsl(var(--accent-h) 25% 40% / 0.06);
  transform-origin: top center;
  animation: panel-attach 0.35s var(--ease-out-quart) 0.06s backwards;
}

@keyframes panel-attach {
  from {
    opacity: 0;
    transform: translateY(-12px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.compact-setting {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
}

.compact-setting label {
  font-size: 0.65rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--text-muted);
  font-weight: 600;
  margin-left: 0.25rem;
}

.pill-selector {
  display: flex;
  align-items: center;
  gap: 0.625rem;
  background: var(--tile-bg);
  padding: 0.5rem 0.75rem;
  border-radius: calc(var(--tile-radius) * 0.75);
  border: 1.5px solid var(--tile-border);
  transition: border-color var(--duration-fast) var(--ease-out-quart),
    box-shadow var(--duration-fast);
  box-shadow: 0 1px 2px var(--tile-shadow);
}

.pill-selector:focus-within {
  border-color: var(--accent);
  box-shadow: 0 1px 2px var(--tile-shadow),
    0 0 0 2px hsl(var(--accent-h) 50% 60% / 0.1);
}

.setting-value-display {
  font-family: var(--font-body);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--accent);
  margin-left: auto;
  min-width: 55px;
  text-align: right;
}

.slider-control.compact {
  flex: 1;
  height: 20px;
  position: relative;
  display: flex;
  align-items: center;
}

.slider-control.compact input[type="range"] {
  position: absolute;
  width: 100%;
  height: 2px;
  opacity: 0;
  cursor: grab;
  z-index: 3;
}

.slider-control.compact input[type="range"]:active {
  cursor: grabbing;
}

.slider-control.compact .slider-track {
  height: 2px;
  background: var(--divider);
  left: 0;
  right: 0;
  position: absolute;
  border-radius: 1px;
  transition: background var(--duration-fast);
}

.slider-control.compact .slider-thumb {
  width: 12px;
  height: 12px;
  background: var(--accent);
  border-radius: 2px;
  position: absolute;
  left: var(--value, 50%);
  transform: translateX(-50%) rotate(45deg);
  pointer-events: none;
  z-index: 2;
  transition: transform var(--duration-fast) var(--ease-out-back),
    box-shadow var(--duration-fast),
    left 0.1s linear;
  box-shadow: 0 1px 3px hsl(0 0% 0% / 0.15);
}

.slider-control.compact:active .slider-thumb {
  transition: none;
}

.slider-notches {
  position: absolute;
  inset: 0;
  display: flex;
  justify-content: space-between;
  align-items: center;
  pointer-events: none;
  z-index: 1;
}

.slider-notch {
  width: 6px;
  height: 6px;
  background: var(--divider);
  border-radius: 1px;
  transform: rotate(45deg);
  transition: background var(--duration-fast);
}

@media (pointer: fine) and (hover: hover) {
  .pill-selector:hover {
    border-color: var(--accent);
    box-shadow: 0 1px 2px var(--tile-shadow),
      0 0 0 2px hsl(var(--accent-h) 50% 60% / 0.1);
  }

  .pill-selector:hover .slider-notch {
    background: var(--light-accent);
  }

  .pill-selector:hover .slider-track {
    background: var(--light-accent);
  }

  .slider-control.compact:hover .slider-thumb {
    transform: translateX(-50%) rotate(45deg) scale(1.15);
    box-shadow: 0 1px 3px hsl(0 0% 0% / 0.22);
  }
}

.slider-control.compact input:active+.slider-track+.slider-thumb {
  transform: translateX(-50%) rotate(45deg) scale(1.05);
}

.secondary-action-btn {
  margin-top: var(--space-xl);
  background: transparent;
  border: 1px solid var(--divider);
  padding: 0.875rem 2rem;
  border-radius: 99px;
  color: var(--text-secondary);
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.02em;
  cursor: pointer;
  z-index: 10;
  transition: all var(--duration-fast) var(--ease-out-quart);
}

.secondary-action-btn:hover {
  color: var(--text-primary);
  border-color: var(--text-muted);
  box-shadow: 0 4px 12px hsl(0 0% 0% / 0.06);
  transform: translateY(-1px);
}

.secondary-action-btn:active {
  transform: translateY(0) scale(0.98);
  box-shadow: none;
}

.parallax-scene {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
  overflow: hidden;
  perspective: 800px;
  perspective-origin: 50% 50%;
  transform-style: preserve-3d;
}

.parallax-tile {
  position: absolute;
  display: grid;
  place-items: center;
  background: var(--tile-bg);
  border: 1.5px solid var(--tile-border);
  border-radius: 8px;
  font-family: var(--font-display);
  color: var(--text-secondary);
  transform-style: preserve-3d;
  transition: transform 0.12s ease-out;
  will-change: transform;
  overflow: hidden;
  box-shadow: 0 2px 6px hsl(270 30% 50% / 0.12);
}

[data-theme="dark"] .parallax-tile {
  box-shadow: 0 2px 8px hsl(270 30% 5% / 0.4);
}

.parallax-tile::before {
  content: '';
  position: absolute;
  inset: 0;
  border-radius: inherit;
  pointer-events: none;
  background: linear-gradient(135deg,
      hsl(0 0% 100% / 0.6) 0%,
      hsl(0 0% 100% / 0.2) 35%,
      transparent 65%);
}

[data-theme="dark"] .parallax-tile::before {
  background: linear-gradient(135deg,
      hsl(270 40% 85% / 0.04) 0%,
      hsl(270 30% 70% / 0.015) 40%,
      transparent 60%);
}



/* Portrait / Mobile */
@media (max-width: 600px) {
  .logo-container .logo {
    font-size: clamp(2rem, 11vw, 2.75rem);
  }

  .logo-container::after {
    font-size: 0.6rem;
  }

  .start-assembly {
    max-width: 300px;
  }

  .hero-play-btn {
    min-height: 85px;
  }

  .hero-text {
    font-size: 2.25rem;
  }

  .settings-attachment {
    padding: 1rem;
  }
}

/* Short screens */
@media (max-height: 650px) {
  .logo-container {
    margin-bottom: var(--space-md);
  }

  .logo-container .logo {
    font-size: clamp(1.75rem, 6vw, 2.25rem);
  }

  .logo-container::after {
    display: none;
  }

  .hero-play-btn {
    min-height: 70px;
  }

  .hero-text {
    font-size: 1.75rem;
  }

  .settings-attachment {
    padding: 0.875rem;
    gap: 0.625rem;
  }

  .secondary-action-btn {
    margin-top: var(--space-md);
    padding: 0.625rem 1.25rem;
    font-size: 0.8rem;
  }

  .parallax-scene {
    display: none;
  }
}

/* Landscape tablets & larger */
@media (min-width: 768px) and (orientation: landscape) {
  .start-assembly {
    max-width: 380px;
  }

  .hero-play-btn {
    min-height: 110px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .home-layout::before {
    animation: none;
  }
}