/**
 * Design Tokens - branchstone.art
 * Premium Artist Portfolio - Design System Foundation
 *
 * Contents:
 * - Color system (light/dark themes)
 * - Typography scale & fonts
 * - Spacing system
 * - Shadows & elevations
 * - Border radius
 * - Transitions & animations
 */

:root {
  /* ========================================
     COLORS - LIGHT THEME (Warm & Natural)
     ======================================== */

  /* Background Colors */
  --bg-primary: #F5F3F0;      /* Main canvas - warm off-white (slightly darker) */
  --bg-secondary: #F0EDE9;    /* Subtle contrast backgrounds */
  --bg-tertiary: #FFFFFF;     /* Pure white for cards */
  --bg-elevated: #FFFFFF;     /* Elevated surfaces */

  /* Text Colors */
  --text-primary: #1A1816;    /* Main text - rich charcoal */
  --text-secondary: #4A4745;  /* Secondary text */
  --text-tertiary: #6B6662;   /* Tertiary/muted text */
  --text-inverse: #FFFFFF;    /* Text on dark backgrounds */

  /* Accent Colors */
  --accent-primary: #B8866B;    /* Primary accent - warm copper */
  --accent-secondary: #5B7A8F;  /* Secondary accent - slate blue */
  --accent-tertiary: #D4A586;   /* Tertiary accent - light copper */
  --accent-hover: #A67757;      /* Hover state - darker copper */

  /* Copper Color Spectrum (9-tone professional palette) */
  --copper-50: #F5ECE4;    /* Light sand - backgrounds, subtle highlights */
  --copper-100: #E8D5C4;   /* Warm cream - hover backgrounds */
  --copper-200: #D4B89E;   /* Light copper - borders, dividers */
  --copper-300: #C29776;   /* Medium copper - secondary UI elements */
  --copper-400: #B8866B;   /* Primary copper - main brand color */
  --copper-500: #A67757;   /* Dark copper - hover states, emphasis */
  --copper-600: #8C6347;   /* Deep copper - active states */
  --copper-700: #6B4A35;   /* Rich earth - strong contrast */
  --copper-800: #4A3325;   /* Deep earth - text on light backgrounds */
  --copper-900: #2D1F17;   /* Almost black - darkest accents */

  /* Semantic Colors */
  --success: #6B8E7F;   /* Success messages */
  --warning: #C29563;   /* Warning messages */
  --error: #A65B4F;     /* Error messages */

  /* Border Colors */
  --border-subtle: #E8E5E1;   /* Very subtle borders */
  --border-default: #D4CFC9;  /* Default border color */
  --border-strong: #B5ACA3;   /* Strong/emphasized borders */

  /* ========================================
     SHADOWS & ELEVATIONS
     Updated: Increased opacity for better card visibility
     ======================================== */

  --shadow-sm: 0 1px 3px rgba(26, 24, 22, 0.08), 0 1px 2px rgba(26, 24, 22, 0.06);
  --shadow-md: 0 4px 8px rgba(26, 24, 22, 0.10), 0 2px 4px rgba(26, 24, 22, 0.08);
  --shadow-lg: 0 10px 24px rgba(26, 24, 22, 0.12), 0 4px 8px rgba(26, 24, 22, 0.08);
  --shadow-xl: 0 20px 40px rgba(26, 24, 22, 0.15), 0 8px 16px rgba(26, 24, 22, 0.10);

  /* ========================================
     GRADIENTS - Enhanced with multi-stop depth
     ======================================== */

  /* Primary gradients - enhanced with copper palette */
  --gradient-warm: linear-gradient(135deg,
    var(--copper-200) 0%,
    var(--copper-300) 35%,
    var(--copper-400) 65%,
    var(--copper-500) 100%
  );

  --gradient-copper-rich: linear-gradient(135deg,
    var(--copper-300) 0%,
    var(--copper-400) 50%,
    var(--copper-600) 100%
  );

  --gradient-earth: linear-gradient(135deg,
    #5E7A6F 0%,
    #4A5F57 100%
  );

  --gradient-subtle: linear-gradient(180deg,
    var(--bg-primary) 0%,
    var(--bg-secondary) 100%
  );

  /* Radial gradients for depth */
  --gradient-radial-warm: radial-gradient(
    circle at top right,
    var(--copper-100) 0%,
    var(--bg-primary) 60%
  );

  --gradient-radial-glow: radial-gradient(
    circle at center,
    rgba(184, 134, 107, 0.15) 0%,
    rgba(184, 134, 107, 0.05) 50%,
    transparent 100%
  );

  /* Overlay gradients for depth and sophistication */
  --gradient-overlay-top: linear-gradient(
    180deg,
    rgba(26, 24, 22, 0.6) 0%,
    rgba(26, 24, 22, 0.3) 50%,
    transparent 100%
  );

  --gradient-overlay-bottom: linear-gradient(
    0deg,
    rgba(26, 24, 22, 0.7) 0%,
    rgba(26, 24, 22, 0.4) 40%,
    transparent 100%
  );

  /* Shimmer gradient for highlights */
  --gradient-shimmer: linear-gradient(
    90deg,
    transparent 0%,
    rgba(255, 255, 255, 0.3) 50%,
    transparent 100%
  );

  /* ========================================
     TYPOGRAPHY
     ======================================== */

  /* Font Families */
  --font-display: 'Cormorant Garamond', Georgia, serif;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  /* Responsive Display Sizes (fluid typography) */
  --text-display-2xl: clamp(3.5rem, 8vw, 6rem);      /* 56px - 96px */
  --text-display-xl: clamp(3rem, 6vw, 5rem);         /* 48px - 80px */
  --text-display-lg: clamp(2.5rem, 5vw, 4rem);       /* 40px - 64px */
  --text-display-md: clamp(2rem, 4vw, 3rem);         /* 32px - 48px */
  --text-display-sm: clamp(1.75rem, 3vw, 2.5rem);    /* 28px - 40px */

  /* Fixed Type Scale */
  --text-5xl: 3rem;       /* 48px */
  --text-4xl: 2.5rem;     /* 40px */
  --text-3xl: 2rem;       /* 32px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-xl: 1.25rem;     /* 20px */
  --text-lg: 1.125rem;    /* 18px */
  --text-base: 1rem;      /* 16px */
  --text-sm: 0.875rem;    /* 14px */
  --text-xs: 0.75rem;     /* 12px */

  /* Font Weights */
  --font-light: 300;
  --font-regular: 400;
  --font-medium: 500;
  --font-semibold: 600;
  --font-bold: 700;

  /* Line Heights */
  --leading-none: 1;
  --leading-tight: 1.1;
  --leading-snug: 1.25;
  --leading-normal: 1.5;
  --leading-relaxed: 1.75;

  /* Letter Spacing */
  --tracking-tighter: -0.02em;
  --tracking-tight: -0.01em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;
  --tracking-wider: 0.05em;

  /* ========================================
     SPACING SCALE
     ======================================== */

  --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 */
  --space-32: 8rem;     /* 128px */

  /* ========================================
     CONTAINER WIDTHS
     ======================================== */

  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  --container-2xl: 1536px;

  /* ========================================
     BORDER RADIUS
     Enhanced for organic, artisan feel
     ======================================== */

  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 16px;   /* Increased for organic, handcrafted feel */
  --radius-xl: 20px;   /* Adjusted proportionally */
  --radius-2xl: 24px;  /* Adjusted proportionally */
  --radius-full: 9999px;

  /* ========================================
     TRANSITIONS & ANIMATIONS
     ======================================== */

  /* Duration Scale - Premium timing */
  --duration-instant: 100ms;
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --duration-slower: 700ms;

  /* Premium Easing Curves */
  --ease-standard: cubic-bezier(0.4, 0, 0.2, 1);      /* Material standard */
  --ease-decelerate: cubic-bezier(0, 0, 0.2, 1);      /* Entrance */
  --ease-accelerate: cubic-bezier(0.4, 0, 1, 1);      /* Exit */
  --ease-spring: cubic-bezier(0.16, 1, 0.3, 1);       /* Bouncy spring */
  --ease-smooth: cubic-bezier(0.25, 0.1, 0.25, 1);    /* Smooth luxury */
  --ease-subtle: cubic-bezier(0.33, 1, 0.68, 1);      /* Subtle motion */

  /* Composite Transitions - Backwards compatible */
  --transition-fast: 150ms cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-normal: 300ms cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-slow: 500ms cubic-bezier(0.25, 0.1, 0.25, 1);
  --transition-smooth: 400ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Premium Hover Transitions - Refined for luxury feel */
  --transition-hover-lift: transform 300ms cubic-bezier(0.16, 1, 0.3, 1),
                           box-shadow 300ms cubic-bezier(0.16, 1, 0.3, 1);

  --transition-hover-scale: transform 250ms cubic-bezier(0.16, 1, 0.3, 1);

  --transition-hover-color: color 200ms cubic-bezier(0.25, 0.1, 0.25, 1),
                            background-color 200ms cubic-bezier(0.25, 0.1, 0.25, 1),
                            border-color 200ms cubic-bezier(0.25, 0.1, 0.25, 1);

  --transition-hover-all: all 300ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Legacy Easing (backwards compatible) */
  --ease-in-out: cubic-bezier(0.4, 0, 0.2, 1);
  --ease-out: cubic-bezier(0, 0, 0.2, 1);
  --ease-in: cubic-bezier(0.4, 0, 1, 1);
}

/* ========================================
   DARK THEME (Enhanced contrast for WCAG AA)
   ======================================== */

[data-theme="dark"] {
  /* Background Colors */
  --bg-primary: #141210;      /* Deep charcoal - darker */
  --bg-secondary: #1E1B18;    /* Slightly lighter charcoal */
  --bg-tertiary: #282522;     /* Mid-tone charcoal */
  --bg-elevated: #302D2A;     /* Elevated surfaces */

  /* Text Colors - Enhanced for WCAG AA contrast */
  --text-primary: #FAFAF9;    /* Near white - 15.8:1 contrast */
  --text-secondary: #D4D0CB;  /* Lighter warm gray - 10.2:1 contrast */
  --text-tertiary: #A8A39D;   /* Visible muted gray - 6.5:1 contrast */
  --text-inverse: #141210;    /* Dark text on light backgrounds */

  /* Accent Colors - Enhanced for visibility */
  --accent-primary: #D9AD8F;    /* Lighter copper for dark mode */
  --accent-secondary: #8DAFC4;  /* Lighter slate blue for dark mode */
  --accent-tertiary: #E8C9A0;   /* Lightest copper */
  --accent-hover: #E8C9A0;      /* Hover state - even brighter */

  /* Border Colors */
  --border-subtle: #353230;   /* More visible borders */
  --border-default: #4A4540;  /* Default border color */
  --border-strong: #5F5954;   /* Strong borders */

  /* Shadows (darker, more pronounced for dark mode) */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.15), 0 1px 2px rgba(0, 0, 0, 0.12);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.20), 0 2px 4px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 10px 24px rgba(0, 0, 0, 0.25), 0 4px 8px rgba(0, 0, 0, 0.18);
  --shadow-xl: 0 20px 40px rgba(0, 0, 0, 0.30), 0 8px 16px rgba(0, 0, 0, 0.20);

  /* Gradients */
  --gradient-warm: linear-gradient(135deg, #E8C9A0 0%, #D9AD8F 100%);
  --gradient-earth: linear-gradient(135deg, #8FB3A4 0%, #6B9485 100%);
  --gradient-subtle: linear-gradient(180deg, #141210 0%, #1E1B18 100%);
}

/* ========================================
   REDUCED MOTION
   ======================================== */

@media (prefers-reduced-motion: reduce) {
  :root {
    /* Durations */
    --duration-instant: 0ms;
    --duration-fast: 0ms;
    --duration-normal: 0ms;
    --duration-slow: 0ms;
    --duration-slower: 0ms;

    /* Transitions - instant but keep easing for potential micro-animations */
    --transition-fast: 0ms;
    --transition-normal: 0ms;
    --transition-slow: 0ms;
    --transition-smooth: 0ms;
  }

  /* Disable transforms and animations */
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}