/* ========================================
   DESIGN TOKENS v1.0 - Phase 4
   Centralized Design System
   ======================================== */

:root {
    /* =====================
       SPACING SYSTEM
       Base: 4px (0.25rem)
       ===================== */
    --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-family-base: 'Inter', 'Roboto', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    --font-family-mono: 'JetBrains Mono', 'Fira Code', Consolas, monospace;
    
    /* Font Sizes - Mobile First */
    --font-size-xs: 0.75rem;     /* 12px */
    --font-size-sm: 0.875rem;    /* 14px */
    --font-size-base: 1rem;      /* 16px */
    --font-size-lg: 1.125rem;    /* 18px */
    --font-size-xl: 1.25rem;     /* 20px */
    --font-size-2xl: 1.5rem;     /* 24px */
    --font-size-3xl: 1.875rem;   /* 30px */
    --font-size-4xl: 2.25rem;    /* 36px */
    --font-size-5xl: 3rem;       /* 48px */
    
    /* Font Weights */
    --font-weight-normal: 400;
    --font-weight-medium: 500;
    --font-weight-semibold: 600;
    --font-weight-bold: 700;
    --font-weight-extrabold: 800;
    
    /* Line Heights */
    --line-height-tight: 1.25;
    --line-height-snug: 1.375;
    --line-height-normal: 1.5;
    --line-height-relaxed: 1.625;
    --line-height-loose: 2;

    /* =====================
       COLORS - Semantic
       ===================== */
    /* Primary Colors */
    --color-primary-50: #eef2ff;
    --color-primary-100: #e0e7ff;
    --color-primary-200: #c7d2fe;
    --color-primary-300: #a5b4fc;
    --color-primary-400: #818cf8;
    --color-primary-500: #6366f1;
    --color-primary-600: #4f46e5;
    --color-primary-700: #4338ca;
    --color-primary-800: #3730a3;
    --color-primary-900: #312e81;
    
    /* Secondary (Pink) */
    --color-secondary-50: #fdf2f8;
    --color-secondary-100: #fce7f3;
    --color-secondary-200: #fbcfe8;
    --color-secondary-300: #f9a8d4;
    --color-secondary-400: #f472b6;
    --color-secondary-500: #ec4899;
    --color-secondary-600: #db2777;
    --color-secondary-700: #be185d;
    --color-secondary-800: #9d174d;
    --color-secondary-900: #831843;
    
    /* Success (Green) */
    --color-success-50: #ecfdf5;
    --color-success-100: #d1fae5;
    --color-success-200: #a7f3d0;
    --color-success-300: #6ee7b7;
    --color-success-400: #34d399;
    --color-success-500: #10b981;
    --color-success-600: #059669;
    --color-success-700: #047857;
    --color-success-800: #065f46;
    --color-success-900: #064e3b;
    
    /* Danger (Red) */
    --color-danger-50: #fef2f2;
    --color-danger-100: #fee2e2;
    --color-danger-200: #fecaca;
    --color-danger-300: #fca5a5;
    --color-danger-400: #f87171;
    --color-danger-500: #ef4444;
    --color-danger-600: #dc2626;
    --color-danger-700: #b91c1c;
    --color-danger-800: #991b1b;
    --color-danger-900: #7f1d1d;
    
    /* Warning (Amber) */
    --color-warning-50: #fffbeb;
    --color-warning-100: #fef3c7;
    --color-warning-200: #fde68a;
    --color-warning-300: #fcd34d;
    --color-warning-400: #fbbf24;
    --color-warning-500: #f59e0b;
    --color-warning-600: #d97706;
    --color-warning-700: #b45309;
    --color-warning-800: #92400e;
    --color-warning-900: #78350f;
    
    /* Neutral (Slate) */
    --color-neutral-50: #f8fafc;
    --color-neutral-100: #f1f5f9;
    --color-neutral-200: #e2e8f0;
    --color-neutral-300: #cbd5e1;
    --color-neutral-400: #94a3b8;
    --color-neutral-500: #64748b;
    --color-neutral-600: #475569;
    --color-neutral-700: #334155;
    --color-neutral-800: #1e293b;
    --color-neutral-900: #0f172a;
    --color-neutral-950: #020617;

    /* =====================
       BORDER RADIUS
       ===================== */
    --radius-none: 0;
    --radius-sm: 0.125rem;    /* 2px */
    --radius-md: 0.375rem;    /* 6px */
    --radius-lg: 0.5rem;      /* 8px */
    --radius-xl: 0.75rem;     /* 12px */
    --radius-2xl: 1rem;       /* 16px */
    --radius-3xl: 1.5rem;     /* 24px */
    --radius-full: 9999px;

    /* =====================
       SHADOWS
       ===================== */
    --shadow-xs: 0 1px 2px 0 rgb(0 0 0 / 0.05);
    --shadow-sm: 0 1px 3px 0 rgb(0 0 0 / 0.1), 0 1px 2px -1px rgb(0 0 0 / 0.1);
    --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
    --shadow-2xl: 0 25px 50px -12px rgb(0 0 0 / 0.25);
    --shadow-inner: inset 0 2px 4px 0 rgb(0 0 0 / 0.05);
    
    /* Colored Shadows */
    --shadow-primary: 0 10px 40px -10px rgba(99, 102, 241, 0.5);
    --shadow-success: 0 10px 40px -10px rgba(16, 185, 129, 0.5);
    --shadow-danger: 0 10px 40px -10px rgba(239, 68, 68, 0.5);
    --shadow-warning: 0 10px 40px -10px rgba(245, 158, 11, 0.5);

    /* =====================
       TRANSITIONS
       ===================== */
    --duration-75: 75ms;
    --duration-100: 100ms;
    --duration-150: 150ms;
    --duration-200: 200ms;
    --duration-300: 300ms;
    --duration-500: 500ms;
    --duration-700: 700ms;
    --duration-1000: 1000ms;
    
    /* 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-bounce: cubic-bezier(0.34, 1.56, 0.64, 1);

    /* =====================
       Z-INDEX SCALE
       ===================== */
    --z-dropdown: 100;
    --z-sticky: 200;
    --z-fixed: 300;
    --z-modal-backdrop: 400;
    --z-modal: 500;
    --z-popover: 600;
    --z-tooltip: 700;
    --z-toast: 800;

    /* =====================
       BREAKPOINTS (for reference)
       ===================== */
    /* 
    --breakpoint-sm: 640px;
    --breakpoint-md: 768px;
    --breakpoint-lg: 1024px;
    --breakpoint-xl: 1280px;
    --breakpoint-2xl: 1536px;
    */

    /* =====================
       COMPONENT TOKENS
       ===================== */
    /* Buttons */
    --btn-height-sm: 2rem;      /* 32px */
    --btn-height-md: 2.5rem;    /* 40px */
    --btn-height-lg: 3rem;      /* 48px */
    --btn-height-xl: 3.5rem;    /* 56px */
    
    /* Inputs */
    --input-height-sm: 2rem;
    --input-height-md: 2.5rem;
    --input-height-lg: 3rem;
    
    /* Cards */
    --card-padding-sm: var(--space-4);
    --card-padding-md: var(--space-6);
    --card-padding-lg: var(--space-8);
    
    /* Avatar */
    --avatar-size-xs: 1.5rem;   /* 24px */
    --avatar-size-sm: 2rem;     /* 32px */
    --avatar-size-md: 2.5rem;   /* 40px */
    --avatar-size-lg: 3rem;     /* 48px */
    --avatar-size-xl: 4rem;     /* 64px */
    
    /* Header */
    --header-height: 70px;
    --header-height-mobile: 60px;
    
    /* Sidebar */
    --sidebar-width: 280px;
    --sidebar-width-collapsed: 70px;
    
    /* Footer */
    --footer-height: auto;
    
    /* Container */
    --container-max-width: 1400px;
    --container-padding: var(--space-6);
}

/* =====================
   DARK THEME OVERRIDES
   ===================== */
[data-theme="dark"],
:root {
    /* Background */
    --bg-base: var(--color-neutral-950);
    --bg-surface: var(--color-neutral-900);
    --bg-elevated: var(--color-neutral-800);
    --bg-overlay: rgba(0, 0, 0, 0.8);
    
    /* Text */
    --text-primary: var(--color-neutral-50);
    --text-secondary: var(--color-neutral-400);
    --text-muted: var(--color-neutral-500);
    --text-disabled: var(--color-neutral-600);
    
    /* Border */
    --border-primary: var(--color-neutral-700);
    --border-secondary: var(--color-neutral-800);
    
    /* Interactive */
    --interactive-normal: var(--color-neutral-700);
    --interactive-hover: var(--color-neutral-600);
    --interactive-active: var(--color-neutral-500);
}

/* =====================
   LIGHT THEME OVERRIDES
   ===================== */
[data-theme="light"] {
    /* Background */
    --bg-base: var(--color-neutral-50);
    --bg-surface: white;
    --bg-elevated: white;
    --bg-overlay: rgba(0, 0, 0, 0.5);
    
    /* Text */
    --text-primary: var(--color-neutral-900);
    --text-secondary: var(--color-neutral-600);
    --text-muted: var(--color-neutral-500);
    --text-disabled: var(--color-neutral-400);
    
    /* Border */
    --border-primary: var(--color-neutral-200);
    --border-secondary: var(--color-neutral-100);
    
    /* Interactive */
    --interactive-normal: var(--color-neutral-100);
    --interactive-hover: var(--color-neutral-200);
    --interactive-active: var(--color-neutral-300);
    
    /* Shadows - Lighter for light theme */
    --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.05), 0 4px 6px -4px rgb(0 0 0 / 0.05);
    --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.05), 0 8px 10px -6px rgb(0 0 0 / 0.05);
}

/* =====================
   GRADIENTS
   ===================== */
:root {
    --gradient-primary: linear-gradient(135deg, var(--color-primary-500) 0%, var(--color-secondary-500) 100%);
    --gradient-secondary: linear-gradient(135deg, var(--color-warning-500) 0%, var(--color-danger-500) 100%);
    --gradient-success: linear-gradient(135deg, var(--color-success-500) 0%, #06b6d4 100%);
    --gradient-dark: linear-gradient(135deg, var(--color-neutral-900) 0%, var(--color-neutral-800) 100%);
    
    /* Glass Effect */
    --glass-bg: rgba(255, 255, 255, 0.05);
    --glass-border: rgba(255, 255, 255, 0.1);
    --glass-blur: blur(20px);
}

[data-theme="light"] {
    --glass-bg: rgba(255, 255, 255, 0.8);
    --glass-border: rgba(0, 0, 0, 0.1);
}