/* ============================================================
   VARIABLES.CSS — Design System Tokens
   Blog/Vlog: Deforestación en Áncash, Perú
   ============================================================
   Defines all color, typography, spacing, shadow, and animation
   tokens as CSS custom properties. Supports light and dark themes.
   ============================================================ */

/* ---------- Light Theme (Default) ---------- */
:root {
  /* — Primary Palette — */
  --color-primary:        #2E7D32;
  --color-primary-light:  #4CAF50;
  --color-primary-dark:   #1B5E20;
  --color-primary-rgb:    46, 125, 50;

  /* — Secondary / Accent — */
  --color-secondary:      #81C784;
  --color-secondary-dark: #66BB6A;

  /* — Earth Tones — */
  --color-earth:          #5D4037;
  --color-earth-light:    #8D6E63;
  --color-earth-rgb:      93, 64, 55;

  /* — Surfaces & Backgrounds — */
  --color-bg:             #FAF9F5;
  --color-bg-alt:         #F0EDE6;
  --color-surface:        #FFFFFF;
  --color-surface-hover:  #F5F5F0;

  /* — Text — */
  --color-text:           #212121;
  --color-text-secondary: #555555;
  --color-text-muted:     #888888;
  --color-text-inverse:   #FFFFFF;

  /* — Borders & Dividers — */
  --color-border:         #E0DDD5;
  --color-border-light:   #EEEAE2;

  /* — Status & Feedback — */
  --color-danger:         #C62828;
  --color-warning:        #F57F17;
  --color-info:           #0277BD;

  /* — Overlay — */
  --color-overlay:        rgba(0, 0, 0, 0.55);
  --color-glass:          rgba(255, 255, 255, 0.75);
  --color-glass-border:   rgba(255, 255, 255, 0.25);

  /* — Gradients — */
  --gradient-hero:        linear-gradient(180deg, rgba(0,0,0,0.45) 0%, rgba(0,0,0,0.20) 50%, rgba(27,94,32,0.50) 100%);
  --gradient-primary:     linear-gradient(135deg, #2E7D32 0%, #1B5E20 100%);
  --gradient-earth:       linear-gradient(135deg, #5D4037 0%, #3E2723 100%);
  --gradient-card:        linear-gradient(180deg, rgba(46,125,50,0.04) 0%, transparent 100%);

  /* — Typography — */
  --font-heading:  'Outfit', sans-serif;
  --font-body:     'Inter', sans-serif;

  --fs-hero:   clamp(2.25rem, 5vw, 4rem);
  --fs-h1:     clamp(1.875rem, 4vw, 3rem);
  --fs-h2:     clamp(1.5rem,   3vw, 2.25rem);
  --fs-h3:     clamp(1.25rem,  2.5vw, 1.75rem);
  --fs-h4:     clamp(1.125rem, 2vw, 1.375rem);
  --fs-body:   clamp(1rem,     1.5vw, 1.125rem);
  --fs-small:  clamp(0.8125rem, 1.2vw, 0.9375rem);
  --fs-xs:     0.75rem;

  --fw-light:    300;
  --fw-regular:  400;
  --fw-medium:   500;
  --fw-semibold: 600;
  --fw-bold:     700;
  --fw-black:    900;

  --lh-tight:    1.2;
  --lh-normal:   1.6;
  --lh-relaxed:  1.8;

  --ls-tight:   -0.02em;
  --ls-normal:   0;
  --ls-wide:     0.05em;
  --ls-caps:     0.12em;

  /* — Spacing Scale — */
  --space-2xs:  0.25rem;   /*  4px */
  --space-xs:   0.5rem;    /*  8px */
  --space-sm:   0.75rem;   /* 12px */
  --space-md:   1rem;      /* 16px */
  --space-lg:   1.5rem;    /* 24px */
  --space-xl:   2rem;      /* 32px */
  --space-2xl:  3rem;      /* 48px */
  --space-3xl:  4rem;      /* 64px */
  --space-4xl:  6rem;      /* 96px */
  --space-5xl:  8rem;      /* 128px */

  /* — Layout — */
  --container-max:     1200px;
  --container-narrow:  800px;
  --container-wide:    1400px;
  --gutter:            clamp(1rem, 3vw, 2rem);

  /* — Border Radius — */
  --radius-sm:   6px;
  --radius-md:   12px;
  --radius-lg:   20px;
  --radius-xl:   28px;
  --radius-full: 9999px;

  /* — Shadows — */
  --shadow-xs:     0  1px  2px  rgba(0, 0, 0, 0.05);
  --shadow-sm:     0  2px  8px  rgba(0, 0, 0, 0.06);
  --shadow-md:     0  4px 16px  rgba(0, 0, 0, 0.08);
  --shadow-lg:     0  8px 32px  rgba(0, 0, 0, 0.10);
  --shadow-xl:     0 16px 48px  rgba(0, 0, 0, 0.14);
  --shadow-glow:   0  0  24px  rgba(46, 125, 50, 0.20);
  --shadow-card:   0  2px 12px  rgba(0, 0, 0, 0.06), 0 1px 3px rgba(0,0,0,0.04);

  /* — Transitions — */
  --transition-fast:   150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base:   250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow:   400ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-spring: 500ms cubic-bezier(0.34, 1.56, 0.64, 1);

  /* — Z-Index Scale — */
  --z-below:     -1;
  --z-base:       1;
  --z-dropdown:  10;
  --z-sticky:    20;
  --z-fixed:     30;
  --z-overlay:   40;
  --z-modal:     50;
  --z-toast:     60;
  --z-max:       99;

  /* — Progress Bar — */
  --progress-height: 3px;

  /* — Nav — */
  --nav-height:  72px;
}

/* ---------- Dark Theme ---------- */
[data-theme="dark"] {
  --color-primary:        #4CAF50;
  --color-primary-light:  #81C784;
  --color-primary-dark:   #388E3C;
  --color-primary-rgb:    76, 175, 80;

  --color-secondary:      #A5D6A7;
  --color-secondary-dark: #81C784;

  --color-earth:          #8D6E63;
  --color-earth-light:    #A1887F;
  --color-earth-rgb:      141, 110, 99;

  --color-bg:             #0F1410;
  --color-bg-alt:         #151C15;
  --color-surface:        #1A221A;
  --color-surface-hover:  #222D22;

  --color-text:           #E8EDE8;
  --color-text-secondary: #B0BAB0;
  --color-text-muted:     #778877;
  --color-text-inverse:   #0F1410;

  --color-border:         #2A352A;
  --color-border-light:   #1F291F;

  --color-overlay:        rgba(0, 0, 0, 0.70);
  --color-glass:          rgba(26, 34, 26, 0.80);
  --color-glass-border:   rgba(76, 175, 80, 0.15);

  --gradient-hero:        linear-gradient(180deg, rgba(0,0,0,0.60) 0%, rgba(0,0,0,0.30) 50%, rgba(15,20,16,0.85) 100%);
  --gradient-primary:     linear-gradient(135deg, #388E3C 0%, #2E7D32 100%);
  --gradient-card:        linear-gradient(180deg, rgba(76,175,80,0.05) 0%, transparent 100%);

  --shadow-xs:     0  1px  2px  rgba(0, 0, 0, 0.20);
  --shadow-sm:     0  2px  8px  rgba(0, 0, 0, 0.25);
  --shadow-md:     0  4px 16px  rgba(0, 0, 0, 0.30);
  --shadow-lg:     0  8px 32px  rgba(0, 0, 0, 0.35);
  --shadow-xl:     0 16px 48px  rgba(0, 0, 0, 0.40);
  --shadow-glow:   0  0  24px  rgba(76, 175, 80, 0.25);
  --shadow-card:   0  2px 12px  rgba(0, 0, 0, 0.20), 0 1px 3px rgba(0,0,0,0.15);
}

/* ---------- Reduced Motion ---------- */
@media (prefers-reduced-motion: reduce) {
  :root {
    --transition-fast:   0ms;
    --transition-base:   0ms;
    --transition-slow:   0ms;
    --transition-spring: 0ms;
  }
}

/* ---------- System Dark Mode Auto-detect ---------- */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme="light"]) {
    --color-primary:        #4CAF50;
    --color-primary-light:  #81C784;
    --color-primary-dark:   #388E3C;
    --color-primary-rgb:    76, 175, 80;
    --color-secondary:      #A5D6A7;
    --color-secondary-dark: #81C784;
    --color-earth:          #8D6E63;
    --color-earth-light:    #A1887F;
    --color-earth-rgb:      141, 110, 99;
    --color-bg:             #0F1410;
    --color-bg-alt:         #151C15;
    --color-surface:        #1A221A;
    --color-surface-hover:  #222D22;
    --color-text:           #E8EDE8;
    --color-text-secondary: #B0BAB0;
    --color-text-muted:     #778877;
    --color-text-inverse:   #0F1410;
    --color-border:         #2A352A;
    --color-border-light:   #1F291F;
    --color-overlay:        rgba(0, 0, 0, 0.70);
    --color-glass:          rgba(26, 34, 26, 0.80);
    --color-glass-border:   rgba(76, 175, 80, 0.15);
    --gradient-hero:        linear-gradient(180deg, rgba(0,0,0,0.60) 0%, rgba(0,0,0,0.30) 50%, rgba(15,20,16,0.85) 100%);
    --gradient-primary:     linear-gradient(135deg, #388E3C 0%, #2E7D32 100%);
    --gradient-card:        linear-gradient(180deg, rgba(76,175,80,0.05) 0%, transparent 100%);
    --shadow-xs:     0  1px  2px  rgba(0, 0, 0, 0.20);
    --shadow-sm:     0  2px  8px  rgba(0, 0, 0, 0.25);
    --shadow-md:     0  4px 16px  rgba(0, 0, 0, 0.30);
    --shadow-lg:     0  8px 32px  rgba(0, 0, 0, 0.35);
    --shadow-xl:     0 16px 48px  rgba(0, 0, 0, 0.40);
    --shadow-glow:   0  0  24px  rgba(76, 175, 80, 0.25);
    --shadow-card:   0  2px 12px  rgba(0, 0, 0, 0.20), 0 1px 3px rgba(0,0,0,0.15);
  }
}