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

:root {
  --bg-dark: #0f0f1a;
  --bg-gradient: linear-gradient(135deg, #1a1a2e 0%, #16213e 50%, #0f0f1a 100%);
  --accent-primary: #e94560;
  --accent-secondary: #ff6b6b;
  --accent-glow: rgba(233, 69, 96, 0.6);
  --text-primary: #ffffff;
  --text-secondary: rgba(255, 255, 255, 0.7);
  --spinner-bg: linear-gradient(145deg, #1f1f3a, #2a2a4a);
  --gold: #ffd700;
  --gold-dark: #b8860b;
}

html, body {
  height: 100%;
  overflow: hidden;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
  background: var(--bg-gradient);
  color: var(--text-primary);
  display: flex;
  justify-content: center;
  align-items: center;
  min-height: 100vh;
  min-height: 100dvh;
  touch-action: manipulation;
  -webkit-tap-highlight-color: transparent;
  user-select: none;
}

.app {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: space-between;
  height: 100%;
  width: 100%;
  max-width: 500px;
  padding: 2rem 1rem;
  gap: 1rem;
}

header {
  text-align: center;
  flex-shrink: 0;
}

h1 {
  font-size: 2.5rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 30px var(--accent-glow);
}

.subtitle {
  color: var(--text-secondary);
  font-size: 1rem;
  margin-top: 0.5rem;
  letter-spacing: 0.05em;
}

.spinner-container {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  /* Use vmin to ensure perfect circle on any device */
  width: min(80vw, 80vh, 400px);
  height: min(80vw, 80vh, 400px);
  flex-shrink: 0;
}

.spinner-ring {
  position: absolute;
  width: 95%;
  height: 95%;
  border-radius: 50%;
  border: 3px solid rgba(255, 255, 255, 0.1);
  box-shadow:
    inset 0 0 30px rgba(233, 69, 96, 0.1),
    0 0 20px rgba(233, 69, 96, 0.2);
  /* Ensure perfect circle */
  aspect-ratio: 1;
}

.spinner-glow {
  position: absolute;
  width: 70%;
  height: 70%;
  border-radius: 50%;
  background: radial-gradient(circle, var(--accent-glow) 0%, transparent 70%);
  opacity: 0;
  transition: opacity 0.3s ease;
  pointer-events: none;
}

.spinner.spinning .spinner-glow,
.spinner-container:has(.spinner.spinning) .spinner-glow {
  opacity: 0.5;
  animation: pulse-glow 0.5s ease-in-out infinite;
}

@keyframes pulse-glow {
  0%, 100% { transform: scale(1); opacity: 0.3; }
  50% { transform: scale(1.1); opacity: 0.6; }
}

.spinner {
  width: 70%;
  height: 70%;
  position: relative;
  cursor: pointer;
  /* GPU acceleration for smooth rotation */
  will-change: transform;
  transform: rotate(0deg);
  transform-origin: center center;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
}

.spinner-face {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: var(--spinner-bg);
  box-shadow:
    0 10px 40px rgba(0, 0, 0, 0.5),
    0 0 0 4px rgba(255, 255, 255, 0.1),
    inset 0 -5px 20px rgba(0, 0, 0, 0.3),
    inset 0 5px 20px rgba(255, 255, 255, 0.1);
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
  /* Ensure perfect circle */
  aspect-ratio: 1;
}

.spinner-center {
  width: 25%;
  height: 25%;
  border-radius: 50%;
  background: linear-gradient(145deg, var(--gold), var(--gold-dark));
  box-shadow:
    0 4px 15px rgba(0, 0, 0, 0.4),
    inset 0 2px 5px rgba(255, 255, 255, 0.5),
    inset 0 -2px 5px rgba(0, 0, 0, 0.3);
  position: relative;
  z-index: 2;
}

.spinner-arrow {
  position: absolute;
  top: 5%;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
  border-bottom: 45% solid var(--accent-primary);
  filter: drop-shadow(0 0 10px var(--accent-glow));
  z-index: 1;
}

.spinner-arrow::before {
  content: '';
  position: absolute;
  top: 20px;
  left: 50%;
  transform: translateX(-50%);
  width: 8px;
  height: calc(100% + 30px);
  background: linear-gradient(to bottom, var(--accent-primary), var(--accent-secondary));
  border-radius: 4px;
}

.direction-markers {
  position: absolute;
  width: 100%;
  height: 100%;
  pointer-events: none;
}

.marker {
  position: absolute;
  width: 10px;
  height: 10px;
  background: rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  top: 50%;
  left: 50%;
  transform:
    rotate(var(--angle))
    translateY(-48%)
    translateY(-50%);
  transform-origin: 0 0;
  box-shadow: 0 0 10px rgba(255, 255, 255, 0.2);
}

.marker::before {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 4px;
  height: 4px;
  background: white;
  border-radius: 50%;
}

.spin-button {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.75rem;
  padding: 1rem 3rem;
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
  color: white;
  background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
  border: none;
  border-radius: 50px;
  cursor: pointer;
  box-shadow:
    0 8px 30px var(--accent-glow),
    0 4px 15px rgba(0, 0, 0, 0.3);
  transition: all 0.2s ease;
  touch-action: manipulation;
}

.spin-button:hover {
  transform: translateY(-2px);
  box-shadow:
    0 12px 40px var(--accent-glow),
    0 6px 20px rgba(0, 0, 0, 0.4);
}

.spin-button:active {
  transform: translateY(1px);
  box-shadow:
    0 4px 20px var(--accent-glow),
    0 2px 10px rgba(0, 0, 0, 0.3);
}

.spin-button:disabled {
  opacity: 0.6;
  cursor: not-allowed;
  transform: none;
}

.button-icon {
  font-size: 1.5rem;
  transition: transform 0.3s ease;
}

.spin-button:not(:disabled):hover .button-icon {
  transform: rotate(45deg);
}

footer {
  flex-shrink: 0;
  text-align: center;
  color: var(--text-secondary);
  font-size: 0.875rem;
  opacity: 0.7;
}

/* Spinning animation */
.spinner.spinning {
  transition: transform 4s cubic-bezier(0.17, 0.67, 0.12, 0.99);
}

/* Remove jitter - don't apply conflicting animations during spin */
.spinner.finishing {
  /* Finishing state handled by JS haptic only */
}

/* Celebration effect */
@keyframes celebrate {
  0% { transform: scale(1); }
  50% { transform: scale(1.05); }
  100% { transform: scale(1); }
}

.spinner.celebrate .spinner-face {
  animation: celebrate 0.3s ease-in-out;
}

.spinner.celebrate .spinner-arrow {
  filter: drop-shadow(0 0 20px var(--gold)) drop-shadow(0 0 40px var(--accent-glow));
}

/* Responsive adjustments */
@media (max-height: 600px) {
  .app {
    padding: 1rem;
  }

  h1 {
    font-size: 1.75rem;
  }

  .subtitle {
    font-size: 0.875rem;
  }

  .spin-button {
    padding: 0.75rem 2rem;
    font-size: 1rem;
  }

  .spinner-container {
    width: min(70vw, 70vh, 300px);
    height: min(70vw, 70vh, 300px);
  }
}

/* Install prompt styles */
.install-prompt {
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  background: rgba(31, 31, 58, 0.95);
  backdrop-filter: blur(10px);
  padding: 1rem;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  transform: translateY(100%);
  transition: transform 0.3s ease;
  z-index: 100;
}

.install-prompt.show {
  transform: translateY(0);
}

.install-prompt p {
  font-size: 0.875rem;
  color: var(--text-secondary);
}

.install-prompt button {
  padding: 0.5rem 1rem;
  border-radius: 20px;
  border: none;
  font-weight: 600;
  cursor: pointer;
  transition: opacity 0.2s;
}

.install-prompt .install-btn {
  background: var(--accent-primary);
  color: white;
}

.install-prompt .dismiss-btn {
  background: transparent;
  color: var(--text-secondary);
  border: 1px solid rgba(255, 255, 255, 0.2);
}