* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  user-select: none;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
}

:root {
  --color-bg-gradient-start: #667eea;
  --color-bg-gradient-end: #764ba2;
  --color-bg-wavy-fade-light: rgba(255, 255, 255, 1);
  --color-bg-wavy-fade-dark: rgba(0, 0, 0, 1);
  --color-bubble-bg: rgba(255, 255, 255, 0.95);
  --color-bubble-shadow-dark: rgba(0, 0, 0, 0.3);
  --color-bubble-shadow-light: rgba(255, 255, 255, 0.2);
  --color-bubble-shadow-inset: rgba(255, 255, 255, 0.6);
  --color-bubble-shadow-dark-hover: rgba(0, 0, 0, 0.4);
  --color-bubble-shadow-light-hover: rgba(255, 255, 255, 0.3);
  --color-message-gradient-start: #667eea;
  --color-message-gradient-end: #764ba2;
  --color-bubble-glow-1: #ff6b6b;
  --color-bubble-glow-2: #4ecdc4;
  --color-bubble-glow-3: #45b7d1;
  --color-bubble-glow-4: #96ceb4;
  --color-bubble-glow-5: #ffeaa7;
  --color-bubble-glow-opacity: 0.6;
  --color-snake-border: #ffd700;
}

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
  background: linear-gradient(135deg, var(--color-bg-gradient-start) 0%, var(--color-bg-gradient-end) 100%);
  min-height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  overflow: hidden;
  position: relative;
}

body::before {
  content: '';
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 10vh;
  background: var(--color-bg-wavy-fade-light);
  pointer-events: none;
  z-index: 5;
}

@media (prefers-color-scheme: dark) {
  body::before {
    background: var(--color-bg-wavy-fade-dark);
  }
}

.container {
  position: relative;
  z-index: 10;
  display: flex;
  flex-direction: column;
  gap: 20px;
  align-items: center;
}

.chat-bubble {
  background: var(--color-bubble-bg);
  backdrop-filter: blur(10px);
  border-radius: 24px;
  padding: 32px 48px;
  box-shadow: 
    0 20px 60px var(--color-bubble-shadow-dark),
    0 0 40px var(--color-bubble-shadow-light),
    inset 0 1px 0 var(--color-bubble-shadow-inset);
  position: relative;
  animation: float 3s ease-in-out infinite;
  transition: box-shadow 0.3s ease;
}

.chat-bubble.clickable {
  cursor: pointer;
}

.chat-bubble.non-clickable {
  cursor: default;
}

.chat-bubble.clickable:hover {
  box-shadow: 
    0 25px 70px var(--color-bubble-shadow-dark-hover),
    0 0 60px var(--color-bubble-shadow-light-hover),
    inset 0 1px 0 var(--color-bubble-shadow-inset);
}

.chat-bubble .snake-border {
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border-radius: 27px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
  overflow: hidden;
}

.chat-bubble.clickable:hover .snake-border {
  opacity: 1;
}

.chat-bubble .snake-border svg {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.chat-bubble .snake-border svg,
.theme-toggle-snake-border svg {
  transform: translateZ(0);
  isolation: isolate;
  contain: layout style paint;
}

.chat-bubble .snake-border svg path,
.theme-toggle-snake-border svg path {
  will-change: stroke-dashoffset;
}

.chat-bubble .snake-border svg stop.snake-color-stop,
.theme-toggle-snake-border svg stop.snake-color-stop {
  animation: snakeColorPulseStop 6s ease-in-out infinite;
  will-change: stop-color;
}

@keyframes snakeColorPulseStop {
  0% {
    stop-color: var(--color-snake-border);
  }
  50% {
    stop-color: var(--color-snake-border-secondary);
  }
  100% {
    stop-color: var(--color-snake-border);
  }
}


.chat-bubble::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 26px;
  background: linear-gradient(45deg, var(--color-bubble-glow-1), var(--color-bubble-glow-2), var(--color-bubble-glow-3), var(--color-bubble-glow-4), var(--color-bubble-glow-5));
  background-size: 300% 300%;
  z-index: -2;
  opacity: var(--color-bubble-glow-opacity);
  animation: glow 3s ease infinite;
  filter: blur(8px);
  /* Force hardware acceleration and proper border-radius rendering */
  will-change: background, filter;
  transform: translateZ(0);
}

/* Force repaint of pseudo-element on theme update */
.chat-bubble.theme-update::after {
  filter: blur(8.01px);
}

.theme-toggle-slider.theme-update::after {
  filter: blur(8.01px);
}

.chat-bubble.wobble {
  animation: wobble 1s ease-in-out;
}

.message {
  font-size: 48px;
  font-weight: 700;
  background: linear-gradient(135deg, var(--color-message-gradient-start) 0%, var(--color-message-gradient-end) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-align: center;
  letter-spacing: -1px;
  line-height: 1;
  display: block;
}

.bubble-tooltip {
  position: absolute;
  bottom: calc(100% + 12px);
  left: 0;
  width: 100%;
  transform: translateY(10px);
  background: var(--color-bubble-bg);
  backdrop-filter: blur(10px);
  color: var(--color-message-gradient-start);
  padding: 8px 16px;
  border-radius: 12px;
  font-size: 14px;
  font-weight: 500;
  white-space: pre-line;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  box-shadow: 
    0 10px 40px var(--color-bubble-shadow-dark),
    0 0 20px var(--color-bubble-shadow-light),
    inset 0 1px 0 var(--color-bubble-shadow-inset);
  transition: opacity 0.3s ease, transform 0.3s ease;
  z-index: 1000;
  overflow: hidden;
  box-sizing: border-box;
}

.bubble-tooltip::before {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 14px;
  background: linear-gradient(45deg, var(--color-bubble-glow-1), var(--color-bubble-glow-2), var(--color-bubble-glow-3), var(--color-bubble-glow-4), var(--color-bubble-glow-5));
  background-size: 300% 300%;
  z-index: -1;
  opacity: var(--color-bubble-glow-opacity);
  animation: glow 3s ease infinite;
  filter: blur(8px);
  will-change: background, filter;
  transform: translateZ(0);
}

.bubble-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 6px solid transparent;
  border-right: 6px solid transparent;
  border-top: 6px solid var(--color-bubble-bg);
  filter: drop-shadow(0 2px 4px rgba(0, 0, 0, 0.1));
}

.chat-bubble:hover .bubble-tooltip {
  opacity: 1;
  transform: translateY(0);
  animation: tooltipBounce 2s ease-in-out infinite;
}

@keyframes tooltipBounce {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-4px);
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0px) scale(1);
  }
  50% {
    transform: translateY(-10px) scale(1);
  }
}

@keyframes glow {
  0%, 100% {
    background-position: 0% 50%;
  }
  50% {
    background-position: 100% 50%;
  }
}

@keyframes travel-glow {
  from {
    stroke-dashoffset: var(--initial-offset, 0);
  }
  to {
    stroke-dashoffset: calc(var(--initial-offset, 0) + var(--pattern-length, 1000));
  }
}


@keyframes wobble {
  0%, 100% {
    transform: translateX(0) translateY(0) rotate(0deg);
  }
  10% {
    transform: translateX(-2px) translateY(-1px) rotate(-0.8deg);
  }
  20% {
    transform: translateX(2px) translateY(1px) rotate(0.8deg);
  }
  30% {
    transform: translateX(-1.5px) translateY(-0.5px) rotate(-0.6deg);
  }
  40% {
    transform: translateX(1.5px) translateY(0.5px) rotate(0.6deg);
  }
  50% {
    transform: translateX(-1px) translateY(-0.5px) rotate(-0.4deg);
  }
  60% {
    transform: translateX(1px) translateY(0.5px) rotate(0.4deg);
  }
  70% {
    transform: translateX(-0.5px) translateY(0) rotate(-0.2deg);
  }
  80% {
    transform: translateX(0.5px) translateY(0) rotate(0.2deg);
  }
  90% {
    transform: translateX(-0.25px) translateY(0) rotate(0deg);
  }
}

.confetti {
  position: absolute;
  width: 10px;
  height: 10px;
  pointer-events: none;
  border-radius: 50%;
  animation: confetti-fall linear forwards;
}

@keyframes confetti-fall {
  to {
    transform: translateY(100vh) rotate(720deg);
    opacity: 0;
  }
}

@keyframes confetti-burst {
  to {
    transform: translate(var(--end-x, 0), var(--end-y, 0)) rotate(720deg);
    opacity: 0;
  }
}

.theme-toggle {
  position: fixed;
  bottom: 20px;
  left: 20px;
  z-index: 1000;
}

/* Theme Toggle Slider Dimensions:
 * - Slider: 200px × 48px, padding: 8px all sides
 * - Track: 184px × 32px (slider inner area), no padding
 * - Thumb: dynamically sized, height: 32px, positioned absolutely
 * - Labels: centered in equal segments
 */
.theme-toggle-slider {
  background: var(--color-bubble-bg);
  backdrop-filter: blur(10px);
  border-radius: 24px;
  padding: 8px;
  box-shadow: 
    0 20px 60px var(--color-bubble-shadow-dark),
    0 0 40px var(--color-bubble-shadow-light),
    inset 0 1px 0 var(--color-bubble-shadow-inset);
  position: relative;
  cursor: pointer;
  transition: transform 0.3s ease, box-shadow 0.3s ease, width 0.3s ease;
  /* Width is set dynamically in JavaScript based on theme count */
  min-width: 200px;
  height: 48px;
  overflow: visible; /* Ensure glow is visible */
}

.theme-toggle-slider:hover {
  transform: scale(1.05);
  box-shadow: 
    0 25px 70px var(--color-bubble-shadow-dark-hover),
    0 0 60px var(--color-bubble-shadow-light-hover),
    inset 0 1px 0 var(--color-bubble-shadow-inset);
}

.theme-toggle-slider::after {
  content: '';
  position: absolute;
  top: -2px;
  left: -2px;
  right: -2px;
  bottom: -2px;
  border-radius: 26px;
  background: linear-gradient(45deg, var(--color-bubble-glow-1), var(--color-bubble-glow-2), var(--color-bubble-glow-3), var(--color-bubble-glow-4), var(--color-bubble-glow-5));
  background-size: 300% 300%;
  z-index: -2;
  opacity: var(--color-bubble-glow-opacity);
  animation: glow 3s ease infinite;
  filter: blur(8px);
  will-change: background, filter;
  transform: translateZ(0);
  pointer-events: none;
}

.theme-toggle-snake-border {
  position: absolute;
  top: -3px;
  left: -3px;
  right: -3px;
  bottom: -3px;
  border-radius: 27px;
  pointer-events: none;
  opacity: 0;
  transition: opacity 0.3s ease;
  z-index: -1;
  overflow: hidden;
}

.theme-toggle-slider:hover .theme-toggle-snake-border {
  opacity: 1;
}

.theme-toggle-snake-border svg {
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}

.theme-toggle-track {
  position: relative;
  width: 100%;
  height: 100%;
  padding: 0;
}

.theme-toggle-label {
  position: absolute;
  top: 50%;
  left: 0;
  font-size: 20px;
  font-weight: 700;
  z-index: 2;
  transition: opacity 0.3s ease, left 0.3s ease, color 0.3s ease;
  pointer-events: none;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0.5;
  transform: translateX(-50%) translateY(-50%);
  /* Position will be set dynamically in JavaScript */
  line-height: 1;
  /* Render emoji as silhouettes (same as bubble buttons) */
  background: linear-gradient(135deg, var(--color-message-gradient-start) 0%, var(--color-message-gradient-end) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

.theme-toggle-label.active {
  /* Use snake border colors for active theme emoji silhouette */
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  animation: snakeColorPulse 6s ease-in-out infinite;
}

@keyframes snakeColorPulse {
  0% {
    background: var(--color-snake-border);
    -webkit-background-clip: text;
    background-clip: text;
  }
  50% {
    background: var(--color-snake-border-secondary);
    -webkit-background-clip: text;
    background-clip: text;
  }
  100% {
    background: var(--color-snake-border);
    -webkit-background-clip: text;
    background-clip: text;
  }
}

.theme-toggle-thumb {
  position: absolute;
  top: 8px;
  left: 0;
  height: 32px; /* 48px slider - 16px padding (8px top + 8px bottom) */
  background: linear-gradient(135deg, var(--color-message-gradient-start) 0%, var(--color-message-gradient-end) 100%);
  border-radius: 20px;
  transition: transform 0.3s ease;
  box-shadow: 
    0 2px 8px rgba(0, 0, 0, 0.2),
    inset 0 1px 0 rgba(255, 255, 255, 0.3);
  z-index: 1;
  /* Width and transform are set dynamically in JavaScript */
}