/* ===================================
   TODDLER GAMES - UNIFIED DESIGN SYSTEM
   =================================== */

:root {
  /* === TYPOGRAPHY === */
  --font-family: 'Fredoka', 'Segoe UI', system-ui, sans-serif;

  /* === SPACING RHYTHM === */
  --space-xs: 8px;
  --space-sm: 12px;
  --space-md: 16px;
  --space-lg: 24px;
  --space-xl: 32px;
  --space-2xl: 48px;

  /* === BORDER RADIUS === */
  --radius-sm: 12px;
  --radius-md: 16px;
  --radius-lg: 24px;
  --radius-xl: 30px;

  /* === SHADOWS - Toy-like depth === */
  --shadow-toy: 0 8px 0 rgba(30, 58, 95, 0.12);
  --shadow-toy-soft: 0 4px 0 rgba(30, 58, 95, 0.08);
  --shadow-hover: 0 10px 0 rgba(30, 58, 95, 0.15);
  --shadow-inset: inset 0 3px 0 rgba(255, 255, 255, 0.5);
  --shadow-lifted: 0 12px 24px rgba(0, 0, 0, 0.2);
}

/* === LIGHT THEME === */
html[data-theme="light"] {
  /* Background - Warm sky gradient */
  --bg-primary: linear-gradient(165deg, #1e3a5f 0%, #0f766e 35%, #bfdbfe 65%, #ffedd5 100%);
  --bg-overlay: rgba(255, 255, 255, 0.95);

  /* Text colors */
  --text-primary: #1e3a5f;
  --text-secondary: #334e68;
  --text-inverse: #ffffff;

  /* Button gradients */
  --btn-primary: linear-gradient(135deg, #f59e0b 0%, #d97706 100%);
  --btn-secondary: linear-gradient(135deg, #0ea5e9 0%, #0369a1 100%);
  --btn-accent: linear-gradient(135deg, #8b5cf6 0%, #6d28d9 100%);
  --btn-success: linear-gradient(135deg, #10b981 0%, #059669 100%);

  /* Splash screen gradient */
  --splash-bg: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
  --splash-title-color: #FFD700;
  --splash-subtitle-color: #ffffff;

  /* Card backgrounds */
  --card-bg: linear-gradient(180deg, #fff 0%, #e0f2fe 100%);
  --card-border: #ffffff;
  --card-shadow: 0 8px 0 rgba(30, 58, 95, 0.15), 0 0 0 2px rgba(30, 64, 175, 0.12);

  /* UI elements */
  --border-light: rgba(255, 255, 255, 0.8);
  --border-medium: rgba(255, 255, 255, 1);
}

/* === DARK THEME === */
html[data-theme="dark"] {
  /* Background - Deep night gradient */
  --bg-primary: linear-gradient(165deg, #0f172a 0%, #1e3a5f 40%, #172554 85%, #0f172a 100%);
  --bg-overlay: rgba(15, 23, 42, 0.95);

  /* Text colors */
  --text-primary: #f1f5f9;
  --text-secondary: #cbd5e1;
  --text-inverse: #0f172a;

  /* Button gradients - slightly muted for dark mode */
  --btn-primary: linear-gradient(135deg, #fb923c 0%, #f97316 100%);
  --btn-secondary: linear-gradient(135deg, #38bdf8 0%, #0ea5e9 100%);
  --btn-accent: linear-gradient(135deg, #a78bfa 0%, #8b5cf6 100%);
  --btn-success: linear-gradient(135deg, #34d399 0%, #10b981 100%);

  /* Splash screen gradient - softer for dark */
  --splash-bg: linear-gradient(135deg, #4c51bf 0%, #5a3d7c 100%);
  --splash-title-color: #FDE047;
  --splash-subtitle-color: #e0e7ff;

  /* Card backgrounds */
  --card-bg: linear-gradient(180deg, #1e293b 0%, #334155 100%);
  --card-border: rgba(148, 163, 184, 0.35);
  --card-shadow: 0 8px 0 rgba(0, 0, 0, 0.25);

  /* UI elements */
  --border-light: rgba(148, 163, 184, 0.3);
  --border-medium: rgba(148, 163, 184, 0.5);

  /* Dark theme shadows */
  --shadow-toy: 0 8px 0 rgba(0, 0, 0, 0.3);
  --shadow-toy-soft: 0 4px 0 rgba(0, 0, 0, 0.2);
  --shadow-hover: 0 10px 0 rgba(0, 0, 0, 0.4);
  --shadow-lifted: 0 12px 24px rgba(0, 0, 0, 0.5);
}

/* === UNIFIED BUTTON SYSTEM === */
.game-btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-sm) var(--space-lg);
  font-size: 18px;
  font-weight: 700;
  font-family: var(--font-family);
  color: var(--text-inverse);
  border: 3px solid var(--border-medium);
  border-radius: var(--radius-md);
  cursor: pointer;
  box-shadow: var(--shadow-toy), var(--shadow-inset);
  text-shadow:
    2px 2px 0px #000000,
    -1px -1px 0px #000000,
    1px -1px 0px #000000,
    -1px 1px 0px #000000;
  transition: all 0.2s ease;
  touch-action: manipulation;
  user-select: none;
}

.game-btn:hover {
  transform: scale(1.05);
  box-shadow: var(--shadow-hover), var(--shadow-inset);
}

.game-btn:active {
  transform: scale(0.96);
  box-shadow: var(--shadow-toy-soft), var(--shadow-inset);
}

.game-btn--primary { background: var(--btn-primary); }
.game-btn--secondary { background: var(--btn-secondary); }
.game-btn--accent { background: var(--btn-accent); }
.game-btn--success { background: var(--btn-success); }

/* === UNIFIED SPLASH SCREEN === */
.unified-splash {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  width: 100vw;
  height: 100vh;
  background: var(--splash-bg);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 20000;
  animation: fadeIn 0.3s ease;
}

.unified-splash.hidden {
  display: none;
}

.unified-splash__content {
  text-align: center;
  padding: var(--space-2xl);
  max-width: 600px;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  width: 100%;
}

.unified-splash__title {
  font-size: clamp(36px, 8vw, 64px);
  font-weight: 800;
  color: var(--splash-title-color);
  text-shadow:
    3px 3px 0px #000000,
    -1px -1px 0px #000000,
    1px -1px 0px #000000,
    -1px 1px 0px #000000,
    0 0 20px rgba(255, 215, 0, 0.6);
  margin-bottom: var(--space-lg);
  filter: drop-shadow(0 8px 16px rgba(0,0,0,0.4));
  animation: gentleBounce 2s ease-in-out infinite;
  line-height: 1.2;
}

.unified-splash__subtitle {
  font-size: clamp(20px, 4vw, 32px);
  font-weight: 700;
  color: var(--splash-subtitle-color);
  text-shadow:
    2px 2px 0px #000000,
    -1px -1px 0px #000000,
    1px -1px 0px #000000,
    -1px 1px 0px #000000;
  margin-bottom: var(--space-2xl);
  line-height: 1.3;
}

.unified-splash__icon {
  width: 300px;
  height: auto;
  margin: 0 auto var(--space-2xl) auto;
  filter: drop-shadow(0 10px 20px rgba(0, 0, 0, 0.3));
  animation: iconFloat 2s ease-in-out infinite;
}

.unified-splash__button {
  min-width: 300px;
  max-width: 400px;
  min-height: 100px;
  padding: var(--space-lg) var(--space-xl);
  font-size: clamp(32px, 5vw, 48px);
  font-weight: 800;
  border-width: 6px;
  border-radius: var(--radius-xl);
}

/* === ANIMATIONS === */
@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@keyframes gentleBounce {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-12px); }
}

@keyframes iconFloat {
  0%, 100% { transform: translateY(0px) rotate(0deg); }
  50% { transform: translateY(-15px) rotate(3deg); }
}

/* === RESPONSIVE === */
@media (max-width: 640px) {
  .game-btn {
    padding: 10px 16px;
    font-size: 16px;
  }

  .unified-splash__icon {
    width: 240px;
  }
}