/* Material Design 3 Color System - GZM Design System */
:root {
  /* Dynamic theme hue - will be updated by JS */
  --theme-hue: 210;
  
  /* Material Design 3 Color Tokens - Light Mode */
  --md-sys-color-primary: hsl(var(--theme-hue), 85%, 35%);
  --md-sys-color-on-primary: hsl(var(--theme-hue), 20%, 99%);
  --md-sys-color-primary-container: hsl(var(--theme-hue), 90%, 90%);
  --md-sys-color-on-primary-container: hsl(var(--theme-hue), 100%, 10%);
  
  --md-sys-color-secondary: hsl(calc(var(--theme-hue) + 30), 70%, 40%);
  --md-sys-color-on-secondary: hsl(calc(var(--theme-hue) + 30), 20%, 99%);
  --md-sys-color-secondary-container: hsl(calc(var(--theme-hue) + 30), 60%, 90%);
  --md-sys-color-on-secondary-container: hsl(calc(var(--theme-hue) + 30), 100%, 10%);
  
  --md-sys-color-tertiary: hsl(calc(var(--theme-hue) + 180), 50%, 40%);
  --md-sys-color-on-tertiary: hsl(calc(var(--theme-hue) + 180), 20%, 99%);
  --md-sys-color-tertiary-container: hsl(calc(var(--theme-hue) + 180), 40%, 90%);
  --md-sys-color-on-tertiary-container: hsl(calc(var(--theme-hue) + 180), 60%, 10%);
  
  --md-sys-color-error: hsl(0, 65%, 48%);
  --md-sys-color-error-container: hsl(0, 93%, 94%);
  --md-sys-color-on-error: hsl(0, 100%, 100%);
  --md-sys-color-on-error-container: hsl(0, 100%, 21%);
  
  --md-sys-color-background: hsl(var(--theme-hue), 20%, 99%);
  --md-sys-color-on-background: hsl(var(--theme-hue), 20%, 10%);
  
  --md-sys-color-surface: hsl(var(--theme-hue), 20%, 98%);
  --md-sys-color-surface-variant: hsl(var(--theme-hue), 15%, 90%);
  --md-sys-color-on-surface: hsl(var(--theme-hue), 10%, 10%);
  --md-sys-color-on-surface-variant: hsl(var(--theme-hue), 15%, 25%);
  
  --md-sys-color-outline: hsl(var(--theme-hue), 10%, 50%);
  --md-sys-color-outline-variant: hsl(var(--theme-hue), 15%, 80%);
  
  /* Font */
  --md-sys-typescale-font-family: 'Roboto', system-ui, -apple-system, sans-serif;
  
  /* Spacing System */
  --md-sys-spacing-xs: 4px;
  --md-sys-spacing-sm: 8px;
  --md-sys-spacing-md: 16px;
  --md-sys-spacing-lg: 24px;
  --md-sys-spacing-xl: 32px;
  --md-sys-spacing-xxl: 48px;
  
  /* RGB values for glassmorphism */
  --md-sys-color-surface-rgb: 251, 251, 254;
  --md-sys-color-outline-rgb: 121, 116, 126;
  
  /* Shape System */
  --md-sys-shape-corner-none: 0px;
  --md-sys-shape-corner-extra-small: 4px;
  --md-sys-shape-corner-small: 8px;
  --md-sys-shape-corner-medium: 12px;
  --md-sys-shape-corner-large: 16px;
  --md-sys-shape-corner-extra-large: 28px;
  --md-sys-shape-corner-full: 9999px;
  
  /* Typography scale */
  --md-sys-typescale-display-large: 57px;
  --md-sys-typescale-display-medium: 45px;
  --md-sys-typescale-display-small: 36px;
  --md-sys-typescale-headline-large: 32px;
  --md-sys-typescale-headline-medium: 28px;
  --md-sys-typescale-headline-small: 24px;
  --md-sys-typescale-title-large: 22px;
  --md-sys-typescale-title-medium: 16px;
  --md-sys-typescale-title-small: 14px;
  --md-sys-typescale-body-large: 16px;
  --md-sys-typescale-body-medium: 14px;
  --md-sys-typescale-body-small: 12px;
  --md-sys-typescale-label-large: 14px;
  --md-sys-typescale-label-medium: 12px;
  --md-sys-typescale-label-small: 11px;
  
  /* Light Theme Elevation */
  --md-sys-elevation-level0: none;
  --md-sys-elevation-level1: 0px 1px 3px 0px rgba(0, 0, 0, 0.12), 0px 1px 2px 0px rgba(0, 0, 0, 0.24);
  --md-sys-elevation-level2: 0px 3px 6px 0px rgba(0, 0, 0, 0.12), 0px 3px 6px 0px rgba(0, 0, 0, 0.24);
  --md-sys-elevation-level3: 0px 6px 12px 0px rgba(0, 0, 0, 0.12), 0px 6px 12px 0px rgba(0, 0, 0, 0.24);
  --md-sys-elevation-level4: 0px 9px 18px 0px rgba(0, 0, 0, 0.12), 0px 9px 18px 0px rgba(0, 0, 0, 0.24);
  --md-sys-elevation-level5: 0px 12px 24px 0px rgba(0, 0, 0, 0.12), 0px 12px 24px 0px rgba(0, 0, 0, 0.24);
}

/* Dark mode overrides */
[data-theme="dark"] {
  --md-sys-color-primary: hsl(var(--theme-hue), 85%, 65%);
  --md-sys-color-on-primary: hsl(var(--theme-hue), 20%, 10%);
  --md-sys-color-primary-container: hsl(var(--theme-hue), 40%, 20%);
  --md-sys-color-on-primary-container: hsl(var(--theme-hue), 90%, 85%);
  
  --md-sys-color-secondary: hsl(calc(var(--theme-hue) + 30), 70%, 60%);
  --md-sys-color-on-secondary: hsl(calc(var(--theme-hue) + 30), 20%, 10%);
  --md-sys-color-secondary-container: hsl(calc(var(--theme-hue) + 30), 60%, 25%);
  --md-sys-color-on-secondary-container: hsl(calc(var(--theme-hue) + 30), 80%, 80%);
  
  --md-sys-color-tertiary: hsl(calc(var(--theme-hue) + 180), 50%, 60%);
  --md-sys-color-on-tertiary: hsl(calc(var(--theme-hue) + 180), 20%, 10%);
  --md-sys-color-tertiary-container: hsl(calc(var(--theme-hue) + 180), 40%, 25%);
  --md-sys-color-on-tertiary-container: hsl(calc(var(--theme-hue) + 180), 60%, 80%);
  
  --md-sys-color-error: hsl(0, 84%, 75%);
  --md-sys-color-error-container: hsl(0, 75%, 29%);
  --md-sys-color-on-error: hsl(0, 75%, 20%);
  --md-sys-color-on-error-container: hsl(0, 100%, 90%);
  
  --md-sys-color-background: hsl(var(--theme-hue), 15%, 8%);
  --md-sys-color-on-background: hsl(var(--theme-hue), 10%, 90%);
  
  --md-sys-color-surface: hsl(var(--theme-hue), 15%, 10%);
  --md-sys-color-surface-variant: hsl(var(--theme-hue), 12%, 25%);
  --md-sys-color-on-surface: hsl(var(--theme-hue), 10%, 90%);
  --md-sys-color-on-surface-variant: hsl(var(--theme-hue), 15%, 75%);
  
  --md-sys-color-outline: hsl(var(--theme-hue), 10%, 60%);
  --md-sys-color-outline-variant: hsl(var(--theme-hue), 10%, 30%);
  
  /* Dark Theme Elevation */
  --md-sys-elevation-level0: none;
  --md-sys-elevation-level1: 0px 1px 2px 0px rgba(0, 0, 0, 0.30), 0px 1px 3px 1px rgba(0, 0, 0, 0.15);
  --md-sys-elevation-level2: 0px 1px 2px 0px rgba(0, 0, 0, 0.30), 0px 2px 6px 2px rgba(0, 0, 0, 0.15);
  --md-sys-elevation-level3: 0px 4px 8px 3px rgba(0, 0, 0, 0.15), 0px 1px 3px 0px rgba(0, 0, 0, 0.30);
  --md-sys-elevation-level4: 0px 6px 10px 4px rgba(0, 0, 0, 0.15), 0px 2px 3px 0px rgba(0, 0, 0, 0.30);
  --md-sys-elevation-level5: 0px 8px 12px 6px rgba(0, 0, 0, 0.15), 0px 4px 4px 0px rgba(0, 0, 0, 0.30);
  
  /* RGB values for glassmorphism - dark mode */
  --md-sys-color-surface-rgb: 28, 27, 31;
  --md-sys-color-outline-rgb: 147, 143, 153;
}

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

body {
  font-family: var(--md-sys-typescale-font-family);
  background-color: var(--md-sys-color-background);
  color: var(--md-sys-color-on-background);
  line-height: 1.5;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  transition: background-color 300ms cubic-bezier(0.2, 0, 0, 1), 
              color 300ms cubic-bezier(0.2, 0, 0, 1);
}

/* App container */
.App {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  background-color: var(--md-sys-color-background);
  position: relative;
  overflow: hidden;
}

/* Dynamic animated background */
.App::before {
  content: '';
  position: fixed;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    ellipse at center,
    hsla(var(--theme-hue), 60%, 50%, 0.02) 0%,
    transparent 40%,
    transparent 100%
  );
  animation: backgroundRotate 45s linear infinite;
  pointer-events: none;
  z-index: 0;
}

.App::after {
  content: '';
  position: fixed;
  bottom: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(
    ellipse at center,
    hsla(calc(var(--theme-hue) + 180), 50%, 50%, 0.02) 0%,
    transparent 40%,
    transparent 100%
  );
  animation: backgroundRotate 60s linear infinite reverse;
  pointer-events: none;
  z-index: 0;
}

@keyframes backgroundRotate {
  from { transform: rotate(0deg); }
  to { transform: rotate(360deg); }
}

/* Ensure content is above background */
.App > * {
  position: relative;
  z-index: 1;
}

/* Header - Material 3 Top App Bar */
.App-header {
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  padding: var(--md-sys-spacing-md) var(--md-sys-spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  position: sticky;
  top: 0;
  z-index: 100;
  /* Material 3 scroll behavior - ensure opaque background */
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

/* Light theme - Surface container color for app bar */
[data-theme="light"] .App-header {
  background-color: hsl(var(--theme-hue), 25%, 95%);
  box-shadow: 0 1px 0 0 var(--md-sys-color-outline-variant);
}

/* Dark theme - Elevated surface with shadow */
[data-theme="dark"] .App-header {
  background-color: hsl(var(--theme-hue), 15%, 15%);
  box-shadow: var(--md-sys-elevation-level2);
}

/* Ensure header is fully opaque */
.App-header::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: inherit;
  z-index: -1;
}

.App-header h1 {
  font-size: var(--md-sys-typescale-display-small);
  font-weight: 400;
  margin: 0;
  background: linear-gradient(135deg, 
    var(--md-sys-color-primary) 0%, 
    var(--md-sys-color-secondary) 50%, 
    var(--md-sys-color-primary) 100%);
  background-size: 200% auto;
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: gradientShift 8s ease infinite;
}

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

.header-controls {
  display: flex;
  gap: 8px;
}

/* Icon buttons */
.theme-toggle,
.color-palette {
  background: transparent;
  border: none;
  border-radius: 50%;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background-color 0.2s ease;
  color: var(--md-sys-color-on-surface);
}

.theme-toggle:hover,
.color-palette:hover {
  background-color: var(--md-sys-color-on-surface);
  background-color: rgba(var(--md-sys-color-on-surface), 0.08);
}

.theme-toggle:active,
.color-palette:active {
  background-color: rgba(var(--md-sys-color-on-surface), 0.12);
}

/* Main content */
main {
  flex: 1;
  padding: var(--md-sys-spacing-lg);
  max-width: 1200px;
  margin: 0 auto;
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--md-sys-spacing-lg);
}

/* Content containers - Consistent width */
#cribbage-calculator,
#score-display {
  max-width: 620px;
  margin: 0 auto;
  width: 100%;
  padding: 0 16px;
}

/* Interactive section - Material You Container with Glassmorphism */
.interactive-section {
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 100%;
  margin: 0 auto var(--md-sys-spacing-lg);
  padding: var(--md-sys-spacing-xl);
  border-radius: var(--md-sys-shape-corner-extra-large);
  background: rgba(var(--md-sys-color-surface-rgb, 255, 255, 255), 0.9);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
  color: var(--md-sys-color-on-surface);
  box-shadow: var(--md-sys-elevation-level3);
  border: 1px solid rgba(var(--md-sys-color-outline-rgb, 0, 0, 0), 0.08);
  position: relative;
  overflow: hidden;
  transition: height 300ms ease-out, padding 300ms cubic-bezier(0.4, 0, 0.2, 1);
  will-change: height;
}

/* Subtle gradient overlay */
.interactive-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, 
    var(--md-sys-color-primary) 0%, 
    transparent 50%, 
    var(--md-sys-color-tertiary) 100%);
  opacity: 0.05;
  pointer-events: none;
}

.interactive-section > * {
  position: relative;
  z-index: 1;
}

.interactive-section h2 {
  font-size: var(--md-sys-typescale-headline-small);
  font-weight: 400;
  margin-bottom: var(--md-sys-spacing-lg);
  color: var(--md-sys-color-on-surface);
  width: 100%;
  text-align: center;
}

.interactive-section h3 {
  font-size: var(--md-sys-typescale-title-medium);
  font-weight: 500;
  margin-top: var(--md-sys-spacing-lg);
  margin-bottom: var(--md-sys-spacing-md);
  color: var(--md-sys-color-on-surface-variant);
  text-transform: none;
  letter-spacing: 0.1px;
  width: 100%;
}

.interactive-section h3:first-child {
  margin-top: 0;
}

/* Buttons - Material 3 Filled Tonal */
button {
  /* Reset */
  appearance: none;
  border: none;
  outline: none;
  cursor: pointer;
  
  /* Typography */
  font-family: var(--md-sys-typescale-font-family);
  font-size: var(--md-sys-typescale-label-large);
  font-weight: 500;
  letter-spacing: 0.1px;
  text-transform: none;
  
  /* Layout */
  min-width: 64px;
  height: 40px;
  padding: 0 var(--md-sys-spacing-lg);
  border-radius: var(--md-sys-shape-corner-full);
  
  /* Effects */
  position: relative;
  overflow: hidden;
  transition: all 200ms cubic-bezier(0.2, 0, 0, 1);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--md-sys-spacing-sm);
}

/* State Layer */
button::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: currentColor;
  opacity: 0;
  transition: opacity 200ms cubic-bezier(0.2, 0, 0, 1);
}

button:hover::before { opacity: 0.08; }
button:focus-visible::before { opacity: 0.12; }
button:active::before { opacity: 0.12; }
button:active { transform: scale(0.96); }

/* Ripple Effect */
.ripple {
  position: absolute;
  border-radius: 50%;
  background-color: currentColor;
  opacity: 0.32;
  animation: rippleEffect 600ms cubic-bezier(0.2, 0, 0, 1);
  pointer-events: none;
}

@keyframes rippleEffect {
  from {
    transform: scale(0);
    opacity: 0.32;
  }
  to {
    transform: scale(4);
    opacity: 0;
  }
}


/* Card selector buttons */
.rank-selector,
.suit-selector {
  width: 100%;
}

.rank-selector button,
.suit-selector button {
  background-color: var(--md-sys-color-surface-variant);
  color: var(--md-sys-color-on-surface);
  min-width: 48px;
  height: 48px;
  padding: var(--md-sys-spacing-sm);
  margin: var(--md-sys-spacing-xs);
  box-shadow: none;
  border: 1px solid var(--md-sys-color-outline-variant);
  position: relative;
  overflow: hidden;
  border-radius: var(--md-sys-shape-corner-medium);
}


/* Ensure better visibility in dark mode */
[data-theme="dark"] .rank-selector button,
[data-theme="dark"] .suit-selector button {
  background-color: var(--md-sys-color-surface-variant);
  border-color: var(--md-sys-color-outline);
}

.rank-selector button:hover,
.suit-selector button:hover {
  background-color: var(--md-sys-color-surface-level1);
  border-color: var(--md-sys-color-outline);
}

/* Active selection state with gradient */
.rank-selector button.active,
.suit-selector button.active {
  background: linear-gradient(135deg, 
    var(--md-sys-color-primary) 0%, 
    hsla(var(--theme-hue), 85%, 45%, 1) 100%);
  color: var(--md-sys-color-on-primary);
  border-color: var(--md-sys-color-primary);
  box-shadow: 
    var(--md-sys-elevation-level1),
    0 0 15px hsla(var(--theme-hue), 85%, 50%, 0.2);
}

.rank-selector button.active:hover,
.suit-selector button.active:hover {
  background: linear-gradient(135deg, 
    hsla(var(--theme-hue), 85%, 40%, 1) 0%, 
    var(--md-sys-color-primary) 100%);
  filter: brightness(1.1);
}

/* Ripple effect for selection feedback */
.rank-selector button::after,
.suit-selector button::after {
  content: '';
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
  border-radius: 50%;
  background-color: var(--md-sys-color-primary);
  opacity: 0.3;
  transform: translate(-50%, -50%);
  transition: width 0.3s, height 0.3s, opacity 0.3s;
}

.rank-selector button.active::after,
.suit-selector button.active::after {
  background-color: var(--md-sys-color-on-primary);
}

.rank-selector button:active::after,
.suit-selector button:active::after {
  width: 100%;
  height: 100%;
  opacity: 0.1;
}

/* Button grid - Card System */
.button-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(56px, 1fr));
  gap: var(--md-sys-spacing-sm);
  padding: var(--md-sys-spacing-lg);
  background-color: var(--md-sys-color-surface-variant);
  border-radius: var(--md-sys-shape-corner-large);
  margin-bottom: var(--md-sys-spacing-md);
  width: 100%;
}


/* Selected cards */
.card-list {
  display: flex;
  flex-wrap: nowrap;
  margin: 24px 0;
  justify-content: center;
  position: relative;
  padding: 0 50px;
  min-height: 140px;
  transition: min-height 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

.selected-card {
  width: 100px;
  height: 140px;
  background: linear-gradient(145deg, #ffffff 0%, #fafafa 100%);
  color: #1a1a1a;
  border-radius: 10px;
  font-size: 28px;
  font-weight: 700;
  box-shadow: 
    0 2px 5px rgba(0, 0, 0, 0.1),
    0 5px 15px rgba(0, 0, 0, 0.15),
    0 10px 25px rgba(0, 0, 0, 0.1),
    inset 0 1px 0 rgba(255, 255, 255, 0.6);
  cursor: pointer;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(0, 0, 0, 0.08);
  text-transform: none;
  animation: cardSlideIn 0.3s ease-out;
  transform-origin: center bottom;
  margin-right: -45px;
  z-index: 1;
}

.selected-card:last-child {
  margin-right: 0;
}

/* Card pattern background */
.card-pattern {
  position: absolute;
  inset: 0;
  background-image: 
    repeating-linear-gradient(45deg,
      transparent,
      transparent 15px,
      rgba(0, 0, 0, 0.005) 15px,
      rgba(0, 0, 0, 0.005) 30px
    );
  border-radius: 10px;
  opacity: 0.3;
}


/* Animation for card slide in */
@keyframes cardSlideIn {
  0% {
    opacity: 0;
    transform: translateY(-30px);
  }
  100% {
    opacity: 1;
    transform: translateY(0);
  }
}


/* Animation for card removal */
.selected-card.removing {
  animation: cardRemove 0.3s ease-out forwards;
}

@keyframes cardRemove {
  to {
    opacity: 0;
    transform: translateY(-20px) scale(0.8) rotate(10deg);
  }
}

/* Animation for clearing all cards */
.selected-card.clearing {
  animation: cardClear 0.4s ease-out forwards;
}

@keyframes cardClear {
  to {
    opacity: 0;
    transform: translateY(30px) scale(0.6) rotate(-15deg);
  }
}

[data-theme="dark"] .selected-card {
  /* Cards always remain light in dark mode */
  background: linear-gradient(145deg, #ffffff 0%, #fafafa 100%);
  color: #1a1a1a;
  box-shadow: 
    0 2px 10px rgba(0, 0, 0, 0.3),
    0 5px 20px rgba(0, 0, 0, 0.4),
    0 10px 30px rgba(0, 0, 0, 0.3);
  border-color: rgba(0, 0, 0, 0.1);
}

[data-theme="dark"] .card-pattern {
  opacity: 0.2;
}

/* Simple hover effect */
.selected-card:hover {
  transform: translateY(-5px);
  box-shadow: 
    0 8px 20px rgba(0, 0, 0, 0.15),
    0 12px 28px rgba(0, 0, 0, 0.1);
  z-index: 10;
}

.selected-card:active {
  transform: translateY(-2px) scale(0.98);
  box-shadow: 
    0 2px 5px rgba(0, 0, 0, 0.1),
    0 5px 15px rgba(0, 0, 0, 0.15);
}

/* Red suits - consistent in both themes since cards are always light */
.selected-card.hearts .card-center,
.selected-card.diamonds .card-center,
.selected-card.hearts .card-corner,
.selected-card.diamonds .card-corner {
  color: #c62828;
}

/* Black suits - ensure visibility on light cards */
.selected-card:not(.hearts):not(.diamonds) {
  color: #000000;
}

/* Card center display */
.card-center {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

.card-rank {
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
}

.card-suit {
  display: flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}

/* Card corners */
.selected-card .card-corner {
  position: absolute;
  font-size: 14px;
  font-weight: 700;
  line-height: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 2px;
  z-index: 2;
}

.selected-card .card-corner.top-left {
  top: 6px;
  left: 6px;
}

.selected-card .card-corner.bottom-right {
  bottom: 6px;
  right: 6px;
  transform: rotate(180deg);
}


/* Clear hand button - Simple Tonal Button */
.clear-hand-btn {
  background-color: var(--md-sys-color-secondary-container);
  color: var(--md-sys-color-on-secondary-container);
  margin-top: 24px;
  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.08);
  animation: fadeInScale 300ms cubic-bezier(0.4, 0, 0.2, 1) forwards;
  transform-origin: center;
  position: relative;
  overflow: hidden;
}

@keyframes fadeInScale {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.clear-hand-btn:hover {
  filter: brightness(1.08);
  transform: translateY(-2px);
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.12);
}

/* Score display - Prominent Card with Float Effect */
.score-display {
  background: linear-gradient(135deg, 
    var(--md-sys-color-primary-container) 0%,
    hsla(var(--theme-hue), 90%, 85%, 0.9) 100%);
  border-radius: var(--md-sys-shape-corner-extra-large);
  padding: 32px;
  box-shadow: 
    0 10px 30px rgba(0, 0, 0, 0.15),
    0 20px 60px rgba(0, 0, 0, 0.1),
    0 0 100px hsla(var(--theme-hue), 70%, 50%, 0.2);
  text-align: center;
  position: relative;
  overflow: hidden;
  width: 100%;
  opacity: 0;
  animation: fadeInUp 400ms cubic-bezier(0.4, 0, 0.2, 1) forwards, floatAnimation 6s ease-in-out infinite;
  border: 1px solid rgba(255, 255, 255, 0.2);
  backdrop-filter: blur(10px);
  -webkit-backdrop-filter: blur(10px);
}

@keyframes floatAnimation {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-3px); }
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* CSS class for hiding score display with animation */
.score-display.hiding {
  animation: fadeOutDown 400ms cubic-bezier(0.4, 0, 1, 1) forwards;
}

@keyframes fadeOutDown {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(20px);
  }
}

/* Decorative background pattern */
.score-display::before {
  content: '';
  position: absolute;
  top: -50%;
  right: -50%;
  width: 200%;
  height: 200%;
  background: radial-gradient(circle, var(--md-sys-color-primary) 0%, transparent 70%);
  opacity: 0.1;
  pointer-events: none;
}

.score-display > * {
  position: relative;
  z-index: 1;
}

.score-display h3 {
  font-size: var(--md-sys-typescale-display-small);
  color: var(--md-sys-color-on-primary-container);
  margin-bottom: 24px;
  font-weight: 400;
}

.score-breakdown {
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  border-collapse: separate;
  border-spacing: 0;
  background-color: var(--md-sys-color-surface);
  border-radius: var(--md-sys-shape-corner-large);
  overflow: hidden;
  box-shadow: var(--md-sys-elevation-level1);
}

.score-breakdown th,
.score-breakdown td {
  padding: 16px 20px;
  text-align: left;
  border-bottom: 1px solid var(--md-sys-color-outline-variant);
}

.score-breakdown th {
  background-color: var(--md-sys-color-surface-level1);
  font-weight: 500;
  font-size: var(--md-sys-typescale-label-large);
  color: var(--md-sys-color-on-surface-variant);
  text-transform: none;
  letter-spacing: 0.5px;
}

.score-breakdown td {
  font-size: var(--md-sys-typescale-body-large);
  font-weight: 400;
}

.score-breakdown td:last-child {
  font-weight: 500;
  color: var(--md-sys-color-primary);
  text-align: right;
}

.score-breakdown tr:last-child td {
  border-bottom: none;
  background-color: var(--md-sys-color-primary-container);
  color: var(--md-sys-color-on-primary-container);
  font-weight: 700;
}


/* Responsive design */
@media (max-width: 768px) {
  .App-header {
    padding: 12px 16px;
  }
  
  .App-header h1 {
    font-size: var(--md-sys-typescale-headline-small);
  }
  
  main {
    padding: 16px;
  }
  
  .interactive-section {
    padding: 16px;
  }
  
  .button-grid {
    grid-template-columns: repeat(auto-fill, minmax(50px, 1fr));
  }
  
  .card-list {
    padding: 0 20px;
  }
  
  .selected-card {
    width: 80px;
    height: 112px;
    margin-right: -35px;
  }
}

/* Smooth transitions for theme changes */
* {
  transition: background-color 200ms cubic-bezier(0.4, 0, 0.2, 1),
              color 200ms cubic-bezier(0.4, 0, 0.2, 1),
              border-color 200ms cubic-bezier(0.4, 0, 0.2, 1),
              box-shadow 200ms cubic-bezier(0.4, 0, 0.2, 1),
              transform 200ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* Accessibility - High Contrast Support */
@media (prefers-contrast: high) {
  .interactive-section {
    border: 1px solid var(--md-sys-color-outline);
  }
  
  button {
    border: 1px solid var(--md-sys-color-outline);
  }
}

/* Accessibility - Reduced Motion Support */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Accessibility - Focus Management */
button:focus-visible {
  outline: 2px solid var(--md-sys-color-primary);
  outline-offset: 2px;
}

@supports not selector(:focus-visible) {
  button:focus {
    outline: 2px solid var(--md-sys-color-primary);
    outline-offset: 2px;
  }
}

/* Notifications */
.notification {
  position: fixed;
  top: 20px;
  right: 20px;
  background-color: var(--md-sys-color-surface);
  color: var(--md-sys-color-on-surface);
  padding: 16px 24px;
  border-radius: var(--md-sys-shape-corner-medium);
  box-shadow: var(--md-sys-elevation-level3);
  transform: translateX(400px);
  transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  z-index: 1000;
  max-width: 350px;
  font-size: var(--md-sys-typescale-body-medium);
}

.notification.show {
  transform: translateX(0);
}

.notification.warning {
  background-color: var(--md-sys-color-error-container);
  color: var(--md-sys-color-on-error-container);
}

/* High score celebration */
.score-display.high-score {
  background: linear-gradient(135deg,
    hsla(var(--theme-hue), 90%, 85%, 0.95) 0%,
    hsla(calc(var(--theme-hue) + 30), 85%, 80%, 0.95) 50%,
    hsla(var(--theme-hue), 90%, 85%, 0.95) 100%);
  background-size: 200% 200%;
  animation: fadeInUp 600ms cubic-bezier(0.4, 0, 0.2, 1) forwards, 
             floatAnimation 6s ease-in-out infinite,
             gradientShift 3s ease infinite;
}

.score-display.celebrating {
  animation: fadeInUp 600ms cubic-bezier(0.4, 0, 0.2, 1) forwards, 
             floatAnimation 6s ease-in-out infinite,
             gradientShift 3s ease infinite,
             celebrationPulse 0.5s ease 3;
}

@keyframes celebrationPulse {
  0%, 100% { transform: scale(1); }
  50% { transform: scale(1.05); }
}

/* Sparkle effects */
.achievement-sparkles {
  position: absolute;
  inset: 0;
  pointer-events: none;
  overflow: hidden;
}

.sparkle {
  position: absolute;
  width: 4px;
  height: 4px;
  background: radial-gradient(circle, white 0%, transparent 100%);
  border-radius: 50%;
  animation: sparkleFloat 3s ease-out forwards;
}

.sparkle::before {
  content: '';
  position: absolute;
  top: -10px;
  left: -10px;
  width: 24px;
  height: 24px;
  background: radial-gradient(circle, 
    hsla(60, 100%, 50%, 0.8) 0%, 
    hsla(45, 100%, 60%, 0.4) 50%,
    transparent 100%);
  border-radius: 50%;
  animation: sparkleGlow 1s ease-out forwards;
}

@keyframes sparkleFloat {
  0% {
    transform: translateY(0) scale(0);
    opacity: 1;
  }
  50% {
    transform: translateY(-50px) scale(1);
    opacity: 1;
  }
  100% {
    transform: translateY(-100px) scale(0.5);
    opacity: 0;
  }
}

@keyframes sparkleGlow {
  0% { transform: scale(0); opacity: 1; }
  50% { transform: scale(1.5); opacity: 0.8; }
  100% { transform: scale(2); opacity: 0; }
}