/* ========================================
   Dice Box - Design System
   ======================================== */

/* CSS Variables */
:root {
  /* Colors */
  --color-bg-primary: #0f0f1a;
  --color-bg-secondary: #1a1a2e;
  --color-bg-tertiary: #16213e;
  --color-accent: #e94560;
  --color-accent-hover: #ff6b6b;
  --color-text-primary: #ffffff;
  --color-text-secondary: rgba(255, 255, 255, 0.7);
  --color-text-muted: rgba(255, 255, 255, 0.5);
  
  /* Glass Effect */
  --glass-bg: rgba(255, 255, 255, 0.05);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
  
  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  
  /* Border Radius */
  --radius-sm: 8px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-full: 50%;
  
  /* Transitions */
  --transition-fast: 0.15s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
  
  /* Typography */
  --font-family: 'Segoe UI', 'Noto Sans KR', sans-serif;
}

/* Reset & Base */
*, *::before, *::after {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

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

body {
  font-family: var(--font-family);
  background: linear-gradient(135deg, var(--color-bg-primary) 0%, var(--color-bg-secondary) 50%, var(--color-bg-tertiary) 100%);
  color: var(--color-text-primary);
  line-height: 1.6;
  -webkit-font-smoothing: antialiased;
}

/* ========================================
   Scene Layout
   ======================================== */

.scene {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--transition-slow), visibility var(--transition-slow);
}

.scene.active {
  opacity: 1;
  visibility: visible;
}

.scene-content {
  width: 100%;
  max-width: 400px;
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-lg);
}

/* ========================================
   Glass Card
   ======================================== */

.glass {
  background: var(--glass-bg);
  backdrop-filter: blur(20px);
  -webkit-backdrop-filter: blur(20px);
  border: 1px solid var(--glass-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--glass-shadow);
}

/* ========================================
   Start Scene
   ======================================== */

.title-area {
  text-align: center;
  margin-bottom: var(--spacing-sm);
}

.title {
  font-size: 3rem;
  font-weight: 700;
  background: linear-gradient(135deg, #fff 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: 0 0 40px rgba(233, 69, 96, 0.3);
  animation: titleGlow 2s ease-in-out infinite alternate;
}

@keyframes titleGlow {
  from { filter: drop-shadow(0 0 20px rgba(233, 69, 96, 0.3)); }
  to { filter: drop-shadow(0 0 30px rgba(233, 69, 96, 0.5)); }
}

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

/* Settings Card */
.settings-card {
  width: 100%;
  padding: var(--spacing-lg);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.setting-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.setting-label {
  font-size: 0.875rem;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

/* Slider */
.slider-container {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
}

.slider {
  flex: 1;
  -webkit-appearance: none;
  appearance: none;
  height: 8px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: var(--radius-full);
  outline: none;
  cursor: pointer;
}

.slider::-webkit-slider-thumb {
  -webkit-appearance: none;
  appearance: none;
  width: 24px;
  height: 24px;
  background: var(--color-accent);
  border-radius: var(--radius-full);
  cursor: pointer;
  box-shadow: 0 0 15px rgba(233, 69, 96, 0.5);
  transition: transform var(--transition-fast);
}

.slider::-webkit-slider-thumb:hover {
  transform: scale(1.2);
}

.slider-value {
  font-size: 1.5rem;
  font-weight: 700;
  min-width: 2ch;
  text-align: center;
  color: var(--color-accent);
}

/* Color Palette */
.color-palette {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.color-btn {
  width: 44px;
  height: 44px;
  border: 3px solid transparent;
  border-radius: var(--radius-full);
  background: var(--btn-color);
  cursor: pointer;
  transition: all var(--transition-fast);
  position: relative;
}

.color-btn::after {
  content: '';
  position: absolute;
  inset: -6px;
  border-radius: var(--radius-full);
  border: 2px solid var(--btn-color);
  opacity: 0;
  transition: opacity var(--transition-fast);
}

.color-btn.active::after,
.color-btn:hover::after {
  opacity: 1;
}

.color-btn.active {
  transform: scale(1.1);
}

/* Roll Button */
.roll-btn {
  width: 100%;
  padding: var(--spacing-md) var(--spacing-lg);
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  background: linear-gradient(135deg, var(--color-accent) 0%, #c0392b 100%);
  border: none;
  border-radius: var(--radius-lg);
  cursor: pointer;
  position: relative;
  overflow: hidden;
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.roll-btn::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
  transition: left var(--transition-slow);
}

.roll-btn:hover {
  transform: translateY(-3px);
  box-shadow: 0 10px 30px rgba(233, 69, 96, 0.4);
}

.roll-btn:hover::before {
  left: 100%;
}

.roll-btn:active {
  transform: translateY(0);
}

/* ========================================
   Rolling Scene
   ======================================== */

#dice-canvas {
  width: 100%;
  height: 100%;
  display: block;
}

.rolling-indicator {
  position: absolute;
  bottom: var(--spacing-xl);
  left: 50%;
  transform: translateX(-50%);
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-text-secondary);
  opacity: 0;
  transition: opacity var(--transition-normal);
}

.rolling-indicator.visible {
  opacity: 1;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 3px solid rgba(255, 255, 255, 0.1);
  border-top-color: var(--color-accent);
  border-radius: var(--radius-full);
  animation: spin 1s linear infinite;
}

@keyframes spin {
  to { transform: rotate(360deg); }
}

/* ========================================
   Result Scene
   ======================================== */

.result-card {
  width: 100%;
  padding: var(--spacing-lg);
  text-align: center;
}

.result-title {
  font-size: 1.25rem;
  color: var(--color-text-secondary);
  margin-bottom: var(--spacing-md);
}

.total-container {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--spacing-xs);
  margin-bottom: var(--spacing-lg);
}

.total-label {
  font-size: 0.875rem;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.1em;
}

.total-value {
  font-size: 4rem;
  font-weight: 800;
  background: linear-gradient(135deg, #fff 0%, var(--color-accent) 100%);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}

/* Dice Groups */
.dice-groups {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  justify-content: center;
}

.dice-group {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-xs) var(--spacing-sm);
  background: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius-md);
}

.dice-group-value {
  font-size: 1.5rem;
  font-weight: 700;
}

.dice-group-count {
  font-size: 0.875rem;
  color: var(--color-text-muted);
}

/* Result Actions */
.result-actions {
  width: 100%;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.action-btn {
  width: 100%;
  padding: var(--spacing-md);
  font-size: 1.125rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--transition-fast);
}

.action-btn.primary {
  color: white;
  background: linear-gradient(135deg, var(--color-accent) 0%, #c0392b 100%);
}

.action-btn.primary:hover {
  transform: translateY(-2px);
  box-shadow: 0 8px 25px rgba(233, 69, 96, 0.3);
}

.action-btn.secondary {
  color: var(--color-text-secondary);
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid var(--glass-border);
}

.action-btn.secondary:hover {
  background: rgba(255, 255, 255, 0.1);
}

/* ========================================
   Responsive Design
   ======================================== */

@media (min-width: 768px) {
  .scene-content {
    max-width: 480px;
  }
  
  .title {
    font-size: 4rem;
  }
  
  .result-actions {
    flex-direction: row;
  }
}