/* ===================================================================
   MuseFlow Design System v2.0
   Future-Forward Minimalist Design with Dual Theme Support
   =================================================================== */

/* =================================================================== 
   1. CSS VARIABLES - Design Tokens
   =================================================================== */

:root {
  /* ============= COLOR PALETTE (Light Mode) ============= */
  
  /* Primary - Purple Gradient */
  --color-primary-50: #F5F3FF;
  --color-primary-100: #EDE9FE;
  --color-primary-200: #DDD6FE;
  --color-primary-300: #C4B5FD;
  --color-primary-400: #A78BFA;
  --color-primary-500: #8B5CF6;
  --color-primary-600: #7C3AED;
  --color-primary-700: #6D28D9;
  --color-primary-800: #5B21B6;
  --color-primary-900: #4C1D95;
  
  /* Neutral - True Grayscale */
  --color-neutral-0: #FFFFFF;
  --color-neutral-50: #FAFAFA;
  --color-neutral-100: #F5F5F5;
  --color-neutral-200: #E5E5E5;
  --color-neutral-300: #D4D4D4;
  --color-neutral-400: #A3A3A3;
  --color-neutral-500: #737373;
  --color-neutral-600: #525252;
  --color-neutral-700: #404040;
  --color-neutral-800: #262626;
  --color-neutral-900: #171717;
  --color-neutral-950: #0A0A0A;
  --color-neutral-1000: #000000;
  
  /* Semantic Colors */
  --color-success: #10B981;
  --color-success-light: #D1FAE5;
  --color-warning: #F59E0B;
  --color-warning-light: #FEF3C7;
  --color-error: #EF4444;
  --color-error-light: #FEE2E2;
  --color-info: #3B82F6;
  --color-info-light: #DBEAFE;
  
  /* ============= THEME COLORS (Light Mode Default) ============= */
  --bg-primary: #FFFFFF;
  --bg-secondary: #F9FAFB;
  --bg-tertiary: #F3F4F6;
  --surface: #FFFFFF;
  --surface-variant: #F9FAFB;
  
  --text-primary: #111827;
  --text-secondary: #6B7280;
  --text-tertiary: #9CA3AF;
  --text-inverse: #FFFFFF;
  
  --border-primary: #E5E7EB;
  --border-secondary: #F3F4F6;
  --divider: #E5E7EB;
  
  --primary: var(--color-primary-500);
  --primary-hover: var(--color-primary-600);
  --primary-light: var(--color-primary-50);
  
  /* ============= GLASSMORPHISM ============= */
  --glass-bg: rgba(255, 255, 255, 0.1);
  --glass-bg-medium: rgba(255, 255, 255, 0.2);
  --glass-bg-heavy: rgba(255, 255, 255, 0.3);
  --glass-border: rgba(255, 255, 255, 0.18);
  --glass-blur: blur(20px);
  --glass-saturation: saturate(180%);
  
  /* ============= SPACING (8px base) ============= */
  --space-0: 0;
  --space-1: 0.25rem;   /* 4px */
  --space-2: 0.5rem;    /* 8px */
  --space-3: 0.75rem;   /* 12px */
  --space-4: 1rem;      /* 16px */
  --space-5: 1.25rem;   /* 20px */
  --space-6: 1.5rem;    /* 24px */
  --space-8: 2rem;      /* 32px */
  --space-10: 2.5rem;   /* 40px */
  --space-12: 3rem;     /* 48px */
  --space-16: 4rem;     /* 64px */
  --space-20: 5rem;     /* 80px */
  --space-24: 6rem;     /* 96px */
  
  /* ============= TYPOGRAPHY ============= */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-display: 'Poppins', 'Inter', sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;
  
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.813rem;   /* 13px */
  --font-size-base: 0.875rem; /* 14px */
  --font-size-lg: 1rem;       /* 16px */
  --font-size-xl: 1.125rem;   /* 18px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 1.875rem;  /* 30px */
  --font-size-4xl: 2.25rem;   /* 36px */
  --font-size-5xl: 3rem;      /* 48px */
  
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-extrabold: 800;
  
  --line-height-tight: 1.25;
  --line-height-normal: 1.5;
  --line-height-relaxed: 1.625;
  
  --letter-spacing-tight: -0.025em;
  --letter-spacing-normal: 0;
  --letter-spacing-wide: 0.025em;
  
  /* ============= EFFECTS ============= */
  
  /* Shadows */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px 0 rgba(0, 0, 0, 0.06);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
  
  /* Elevation (Material Design 3) */
  --elevation-1: 0 1px 2px rgba(0, 0, 0, 0.3), 0 1px 3px 1px rgba(0, 0, 0, 0.15);
  --elevation-2: 0 1px 2px rgba(0, 0, 0, 0.3), 0 2px 6px 2px rgba(0, 0, 0, 0.15);
  --elevation-3: 0 4px 8px 3px rgba(0, 0, 0, 0.15), 0 1px 3px rgba(0, 0, 0, 0.3);
  
  /* Blur */
  --blur-sm: 4px;
  --blur-md: 8px;
  --blur-lg: 16px;
  --blur-xl: 24px;
  --blur-2xl: 40px;
  
  /* Border Radius */
  --radius-sm: 0.25rem;   /* 4px */
  --radius-md: 0.5rem;    /* 8px */
  --radius-lg: 0.75rem;   /* 12px */
  --radius-xl: 1rem;      /* 16px */
  --radius-2xl: 1.5rem;   /* 24px */
  --radius-full: 9999px;
  
  /* ============= ANIMATION ============= */
  
  /* Easing */
  --ease-linear: linear;
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.16, 1, 0.3, 1);
  
  /* Duration */
  --duration-instant: 100ms;
  --duration-fast: 200ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  
  /* ============= Z-INDEX ============= */
  --z-base: 0;
  --z-dropdown: 1000;
  --z-sticky: 1100;
  --z-fixed: 1200;
  --z-modal-backdrop: 1300;
  --z-modal: 1400;
  --z-popover: 1500;
  --z-tooltip: 1600;
  --z-notification: 1700;
}

/* =================================================================== 
   2. DARK MODE THEME
   =================================================================== */

.dark {
  /* ============= THEME COLORS (Dark Mode) ============= */
  --bg-primary: #0A0A0A;
  --bg-secondary: #111111;
  --bg-tertiary: #1A1A1A;
  --surface: #111111;
  --surface-variant: #1A1A1A;
  
  --text-primary: #F9FAFB;
  --text-secondary: #D1D5DB;
  --text-tertiary: #9CA3AF;
  --text-inverse: #111827;
  
  --border-primary: #333333;
  --border-secondary: #262626;
  --divider: #1A1A1A;
  
  --primary: var(--color-primary-400);
  --primary-hover: var(--color-primary-500);
  --primary-light: rgba(167, 139, 250, 0.1);
  
  /* Glassmorphism (Dark) */
  --glass-bg: rgba(0, 0, 0, 0.5);
  --glass-bg-medium: rgba(0, 0, 0, 0.6);
  --glass-bg-heavy: rgba(0, 0, 0, 0.7);
  --glass-border: rgba(255, 255, 255, 0.1);
  --glass-blur: blur(40px);
  
  /* Shadows (Dark) */
  --shadow-xs: 0 1px 2px 0 rgba(0, 0, 0, 0.5);
  --shadow-sm: 0 1px 3px 0 rgba(0, 0, 0, 0.5);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.6);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.7);
  --shadow-2xl: 0 25px 50px -12px rgba(0, 0, 0, 0.8);
  
  --elevation-1: 0 1px 2px rgba(0, 0, 0, 0.8), 0 1px 3px 1px rgba(0, 0, 0, 0.5);
  --elevation-2: 0 1px 2px rgba(0, 0, 0, 0.8), 0 2px 6px 2px rgba(0, 0, 0, 0.5);
  --elevation-3: 0 4px 8px 3px rgba(0, 0, 0, 0.5), 0 1px 3px rgba(0, 0, 0, 0.8);
}

/* =================================================================== 
   3. GLASSMORPHISM COMPONENTS
   =================================================================== */

.glass-card {
  background: linear-gradient(
    135deg,
    var(--glass-bg),
    var(--glass-bg-medium)
  );
  backdrop-filter: var(--glass-blur) var(--glass-saturation);
  -webkit-backdrop-filter: var(--glass-blur) var(--glass-saturation);
  border: 1px solid var(--glass-border);
  box-shadow: var(--elevation-2);
  border-radius: var(--radius-xl);
  transition: all var(--duration-normal) var(--ease-smooth);
}

.glass-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--elevation-3);
}

.glass-button {
  background: rgba(139, 92, 246, 0.1);
  backdrop-filter: blur(10px);
  border: 1px solid rgba(139, 92, 246, 0.3);
  color: var(--primary);
  padding: var(--space-3) var(--space-6);
  border-radius: var(--radius-lg);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--duration-fast) var(--ease-smooth);
}

.glass-button:hover {
  background: rgba(139, 92, 246, 0.2);
  border-color: rgba(139, 92, 246, 0.5);
  transform: scale(1.02);
}

/* =================================================================== 
   4. UTILITY CLASSES
   =================================================================== */

/* Spacing */
.p-0 { padding: var(--space-0); }
.p-2 { padding: var(--space-2); }
.p-4 { padding: var(--space-4); }
.p-6 { padding: var(--space-6); }
.p-8 { padding: var(--space-8); }

.m-0 { margin: var(--space-0); }
.m-2 { margin: var(--space-2); }
.m-4 { margin: var(--space-4); }
.m-6 { margin: var(--space-6); }
.m-8 { margin: var(--space-8); }

/* Typography */
.text-xs { font-size: var(--font-size-xs); }
.text-sm { font-size: var(--font-size-sm); }
.text-base { font-size: var(--font-size-base); }
.text-lg { font-size: var(--font-size-lg); }
.text-xl { font-size: var(--font-size-xl); }

.font-normal { font-weight: var(--font-weight-normal); }
.font-medium { font-weight: var(--font-weight-medium); }
.font-semibold { font-weight: var(--font-weight-semibold); }
.font-bold { font-weight: var(--font-weight-bold); }

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

/* Border Radius */
.rounded-sm { border-radius: var(--radius-sm); }
.rounded-md { border-radius: var(--radius-md); }
.rounded-lg { border-radius: var(--radius-lg); }
.rounded-xl { border-radius: var(--radius-xl); }
.rounded-2xl { border-radius: var(--radius-2xl); }
.rounded-full { border-radius: var(--radius-full); }

/* Shadows */
.shadow-sm { box-shadow: var(--shadow-sm); }
.shadow-md { box-shadow: var(--shadow-md); }
.shadow-lg { box-shadow: var(--shadow-lg); }
.shadow-xl { box-shadow: var(--shadow-xl); }

/* Transitions */
.transition-all { transition: all var(--duration-normal) var(--ease-smooth); }
.transition-fast { transition: all var(--duration-fast) var(--ease-smooth); }