/* ============================================
   LIGHT MODE THEME - Default
   ============================================ */
:root {
  /* Primary Colors */
  --color-primary: #6366f1;
  --color-primary-light: #818cf8;
  --color-primary-dark: #4f46e5;
  
  /* Secondary Colors */
  --color-secondary: #ec4899;
  --color-secondary-light: #f472b6;
  --color-secondary-dark: #be185d;
  
  /* Accent Colors */
  --color-accent: #f59e0b;
  --color-accent-light: #fbbf24;
  --color-accent-dark: #d97706;
  
  /* Neutral Colors */
  --color-bg-primary: #ffffff;
  --color-bg-secondary: #f9fafb;
  --color-bg-tertiary: #f3f4f6;
  
  --color-text-primary: #111827;
  --color-text-secondary: #4b5563;
  --color-text-tertiary: #9ca3af;
  
  --color-border: #e5e7eb;
  --color-border-light: #f3f4f6;
  
  /* Status Colors */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1);
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;
  
  /* Typography */
  --font-family-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-family-mono: 'Fira Code', 'Courier New', monospace;
  
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  --line-height-tight: 1.25;
  --line-height-snug: 1.375;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  --line-height-loose: 2;
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 300ms ease;
  
  /* Border Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-2xl: 1.5rem;
  --radius-full: 9999px;
}

/* ============================================
   DARK MODE THEME
   ============================================ */
@media (prefers-color-scheme: dark) {
  :root {
    --color-primary: #a78bfa;
    --color-primary-light: #c4b5fd;
    --color-primary-dark: #8b5cf6;
    
    --color-secondary: #f472b6;
    --color-secondary-light: #fbcfe8;
    --color-secondary-dark: #ec4899;
    
    --color-accent: #fbbf24;
    --color-accent-light: #fcd34d;
    --color-accent-dark: #f59e0b;
    
    --color-bg-primary: #0f172a;
    --color-bg-secondary: #1e293b;
    --color-bg-tertiary: #334155;
    
    --color-text-primary: #f1f5f9;
    --color-text-secondary: #cbd5e1;
    --color-text-tertiary: #94a3b8;
    
    --color-border: #475569;
    --color-border-light: #334155;
    
    --color-success: #34d399;
    --color-warning: #fbbf24;
    --color-error: #f87171;
    --color-info: #60a5fa;
  }
  
  body {
    color-scheme: dark;
  }
}

/* ============================================
   DARK MODE - Data Attribute Override
   ============================================ */
html[data-theme="dark"] {
  --color-primary: #a78bfa;
  --color-primary-light: #c4b5fd;
  --color-primary-dark: #8b5cf6;
  
  --color-secondary: #f472b6;
  --color-secondary-light: #fbcfe8;
  --color-secondary-dark: #ec4899;
  
  --color-accent: #fbbf24;
  --color-accent-light: #fcd34d;
  --color-accent-dark: #f59e0b;
  
  --color-bg-primary: #0f172a;
  --color-bg-secondary: #1e293b;
  --color-bg-tertiary: #334155;
  
  --color-text-primary: #f1f5f9;
  --color-text-secondary: #cbd5e1;
  --color-text-tertiary: #94a3b8;
  
  --color-border: #475569;
  --color-border-light: #334155;
  
  --color-success: #34d399;
  --color-warning: #fbbf24;
  --color-error: #f87171;
  --color-info: #60a5fa;
  
  color-scheme: dark;
}

/* ============================================
   SUNSET THEME
   ============================================ */
html[data-theme="sunset"] {
  --color-primary: #ea580c;
  --color-primary-light: #f97316;
  --color-primary-dark: #c2410c;
  
  --color-secondary: #dc2626;
  --color-secondary-light: #ef4444;
  --color-secondary-dark: #b91c1c;
  
  --color-accent: #eab308;
  --color-accent-light: #facc15;
  --color-accent-dark: #ca8a04;
  
  --color-bg-primary: #1f1410;
  --color-bg-secondary: #2d1f1a;
  --color-bg-tertiary: #3d2817;
  
  --color-text-primary: #fef3c7;
  --color-text-secondary: #fcd34d;
  --color-text-tertiary: #f59e0b;
  
  --color-border: #d97706;
  --color-border-light: #b45309;
  
  --color-success: #059669;
  --color-warning: #f59e0b;
  --color-error: #dc2626;
  --color-info: #f97316;
}

/* ============================================
   MINT THEME
   ============================================ */
html[data-theme="mint"] {
  --color-primary: #0d9488;
  --color-primary-light: #14b8a6;
  --color-primary-dark: #0f766e;
  
  --color-secondary: #0891b2;
  --color-secondary-light: #06b6d4;
  --color-secondary-dark: #0e7490;
  
  --color-accent: #7c3aed;
  --color-accent-light: #a855f7;
  --color-accent-dark: #6d28d9;
  
  --color-bg-primary: #0f2f2f;
  --color-bg-secondary: #134e4a;
  --color-bg-tertiary: #0d9488;
  
  --color-text-primary: #ccfbf1;
  --color-text-secondary: #99f6e4;
  --color-text-tertiary: #2dd4bf;
  
  --color-border: #14b8a6;
  --color-border-light: #2dd4bf;
  
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #06b6d4;
}

/* ============================================
   APPLY CSS VARIABLES TO DOM
   ============================================ */
body {
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  font-family: var(--font-family-sans);
  font-size: var(--font-size-base);
  line-height: var(--line-height-normal);
  transition: background-color var(--transition-base), color var(--transition-base);
}

/* ============================================
   SMOOTH SCROLL BEHAVIOR
   ============================================ */
html {
  scroll-behavior: smooth;
}

/* ============================================
   ANIMATIONS
   ============================================ */
@keyframes fadeIn {
  from {
    opacity: 0;
    transform: translateY(10px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideOutDown {
  from {
    opacity: 1;
    transform: translateY(0);
  }
  to {
    opacity: 0;
    transform: translateY(30px);
  }
}

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

@keyframes pulse {
  0%, 100% {
    opacity: 1;
  }
  50% {
    opacity: 0.5;
  }
}

@keyframes shimmer {
  0% {
    background-position: -1000px 0;
  }
  100% {
    background-position: 1000px 0;
  }
}

.fade-in {
  animation: fadeIn var(--transition-slow) ease-out;
}

.slide-in-left {
  animation: slideInLeft var(--transition-slow) ease-out;
}

.slide-in-right {
  animation: slideInRight var(--transition-slow) ease-out;
}

.slide-in-up {
  animation: slideInUp var(--transition-slow) ease-out;
}

.scale-in {
  animation: scaleIn var(--transition-base) ease-out;
}

.pulse {
  animation: pulse 2s ease-in-out infinite;
}

/* ============================================
   UTILITY CLASSES
   ============================================ */
.text-primary {
  color: var(--color-primary);
}

.text-secondary {
  color: var(--color-secondary);
}

.bg-primary {
  background-color: var(--color-primary);
}

.bg-secondary {
  background-color: var(--color-secondary);
}

.border-primary {
  border-color: var(--color-border);
}

.shadow-card {
  box-shadow: var(--shadow-md);
}

.shadow-hover {
  box-shadow: var(--shadow-lg);
  transition: box-shadow var(--transition-base);
}

.transition-all {
  transition: all var(--transition-base);
}

/* ============================================
   SMOOTH FORM INPUTS
   ============================================ */
input, textarea, select {
  background-color: var(--color-bg-secondary);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-md) var(--spacing-lg);
  font-family: var(--font-family-sans);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
}

input:focus, textarea:focus, select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* ============================================
   BUTTON STYLES
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-lg);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-base);
  font-family: var(--font-family-sans);
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-secondary {
  background-color: var(--color-secondary);
  color: white;
}

.btn-secondary:hover {
  background-color: var(--color-secondary-dark);
  transform: translateY(-2px);
  box-shadow: var(--shadow-lg);
}

.btn-outline {
  background-color: transparent;
  color: var(--color-primary);
  border: 2px solid var(--color-primary);
}

.btn-outline:hover {
  background-color: var(--color-primary);
  color: white;
}

/* ============================================
   THEME SELECTOR STYLES
   ============================================ */
.theme-button {
  position: relative;
  overflow: hidden;
}

.theme-button::before {
  content: '';
  position: absolute;
  top: 0;
  left: -100%;
  width: 100%;
  height: 100%;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,0.1), transparent);
  transition: left 0.5s;
}

.theme-button:hover::before {
  left: 100%;
}

/* Highlight active theme */
html[data-theme="light"] button[onclick*="'light'"],
html[data-theme="dark"] button[onclick*="'dark'"],
html[data-theme="sunset"] button[onclick*="'sunset'"],
html[data-theme="mint"] button[onclick*="'mint'"] {
  border-color: var(--color-primary) !important;
  background-color: var(--color-primary) !important;
  color: white !important;
  font-weight: 600;
  box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.2);
}