:root {
  --room-size: 400px;
  --inner-size: 120px;
  --rotation-duration: 20s;
  
  --primary: #1a1a2e;
  --secondary: #16213e;
  --dark: #0f0f1a;
  --accent: rgba(56, 189, 248, 0.15);
  --grid-color: rgba(56, 189, 248, 0.08);
  
  --inner-primary: rgba(248, 113, 113, 0.3);
  --inner-accent: rgba(248, 113, 113, 0.6);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  background: #0a0a0f;
  overflow: hidden;
  font-family: system-ui, -apple-system, sans-serif;
}

.scene {
  perspective: 800px;
  perspective-origin: 50% 50%;
  width: 100vw;
  height: 100vh;
  display: flex;
  align-items: center;
  justify-content: center;
}

.room {
  position: relative;
  width: var(--room-size);
  height: var(--room-size);
  transform-style: preserve-3d;
  animation: rotate var(--rotation-duration) linear infinite;
}

.room.paused {
  animation-play-state: paused;
}

@keyframes rotate {
  0% {
    transform: rotateX(0deg) rotateY(0deg);
  }
  25% {
    transform: rotateX(15deg) rotateY(90deg);
  }
  50% {
    transform: rotateX(0deg) rotateY(180deg);
  }
  75% {
    transform: rotateX(-15deg) rotateY(270deg);
  }
  100% {
    transform: rotateX(0deg) rotateY(360deg);
  }
}

.wall {
  position: absolute;
  width: var(--room-size);
  height: var(--room-size);
  backface-visibility: visible;
  border: 1px solid var(--accent);
  box-shadow: inset 0 0 80px rgba(0, 0, 0, 0.5);
  transition: opacity 0.5s ease;
}

.wall.hidden {
  opacity: 0;
  pointer-events: none;
}

.wall-content {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
}

.wall-label {
  font-size: 1.5rem;
  font-weight: 600;
  color: rgba(56, 189, 248, 0.4);
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

/* Back wall */
.wall.back {
  transform: translateZ(calc(var(--room-size) / -2));
  background: 
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(180deg, var(--dark) 0%, var(--primary) 50%, var(--secondary) 100%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

/* Front wall */
.wall.front {
  transform: translateZ(calc(var(--room-size) / 2)) rotateY(180deg);
  background: 
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(180deg, var(--secondary) 0%, var(--primary) 50%, var(--dark) 100%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

/* Left wall */
.wall.left {
  transform: translateX(calc(var(--room-size) / -2)) rotateY(90deg);
  background: 
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--dark) 0%, var(--primary) 100%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

/* Right wall */
.wall.right {
  transform: translateX(calc(var(--room-size) / 2)) rotateY(-90deg);
  background: 
    linear-gradient(var(--grid-color) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-color) 1px, transparent 1px),
    linear-gradient(-90deg, var(--dark) 0%, var(--primary) 100%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

/* Floor */
.wall.floor {
  transform: translateY(calc(var(--room-size) / 2)) rotateX(90deg);
  background: 
    linear-gradient(var(--accent) 1px, transparent 1px),
    linear-gradient(90deg, var(--accent) 1px, transparent 1px),
    linear-gradient(180deg, var(--primary) 0%, var(--secondary) 50%, var(--primary) 100%);
  background-size: 40px 40px, 40px 40px, 100% 100%;
}

/* Ceiling */
.wall.ceiling {
  transform: translateY(calc(var(--room-size) / -2)) rotateX(-90deg);
  background: 
    linear-gradient(rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, 0.03) 1px, transparent 1px),
    linear-gradient(180deg, var(--dark) 0%, var(--primary) 100%);
  background-size: 60px 60px, 60px 60px, 100% 100%;
}

/* Inner cube (tesseract) */
.inner-cube {
  position: absolute;
  width: var(--inner-size);
  height: var(--inner-size);
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  transform-style: preserve-3d;
  animation: inner-rotate var(--rotation-duration) linear infinite reverse;
}

@keyframes inner-rotate {
  0% {
    transform: translate(-50%, -50%) rotateX(0deg) rotateY(0deg) rotateZ(0deg);
  }
  100% {
    transform: translate(-50%, -50%) rotateX(360deg) rotateY(360deg) rotateZ(360deg);
  }
}

.inner-face {
  position: absolute;
  width: var(--inner-size);
  height: var(--inner-size);
  background: var(--inner-primary);
  border: 2px solid var(--inner-accent);
  box-shadow: 
    inset 0 0 30px rgba(248, 113, 113, 0.2),
    0 0 20px rgba(248, 113, 113, 0.1);
}

.inner-face.back {
  transform: translateZ(calc(var(--inner-size) / -2));
}

.inner-face.front {
  transform: translateZ(calc(var(--inner-size) / 2));
}

.inner-face.left {
  transform: translateX(calc(var(--inner-size) / -2)) rotateY(90deg);
}

.inner-face.right {
  transform: translateX(calc(var(--inner-size) / 2)) rotateY(-90deg);
}

.inner-face.top {
  transform: translateY(calc(var(--inner-size) / -2)) rotateX(90deg);
}

.inner-face.bottom {
  transform: translateY(calc(var(--inner-size) / 2)) rotateX(-90deg);
}

/* Controls */
.controls {
  position: fixed;
  bottom: 2rem;
  display: flex;
  gap: 1rem;
  align-items: center;
  background: rgba(20, 20, 35, 0.9);
  padding: 1rem 1.5rem;
  border-radius: 12px;
  border: 1px solid rgba(56, 189, 248, 0.2);
  backdrop-filter: blur(10px);
  z-index: 10;
  flex-wrap: wrap;
  justify-content: center;
  max-width: 90vw;
}

.controls button {
  background: rgba(56, 189, 248, 0.2);
  color: rgba(56, 189, 248, 0.9);
  border: 1px solid rgba(56, 189, 248, 0.3);
  padding: 0.5rem 0.75rem;
  border-radius: 6px;
  cursor: pointer;
  font-size: 0.85rem;
  transition: all 0.2s ease;
}

.controls button:hover {
  background: rgba(56, 189, 248, 0.3);
}

.controls button.active {
  background: rgba(56, 189, 248, 0.5);
  border-color: rgba(56, 189, 248, 0.7);
}

.controls label {
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.85rem;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.controls input[type="range"] {
  width: 80px;
  accent-color: rgba(56, 189, 248, 0.8);
}

.divider {
  width: 1px;
  height: 24px;
  background: rgba(56, 189, 248, 0.2);
}