/* ============================================
   FKSB - Design Tokens & Themes
   Agricultural Minimal Redesign
   ============================================ */

:root {
  /* === Spacing === */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.5rem;
  --space-6: 2rem;
  --space-7: 3rem;
  --space-8: 4rem;
  --space-9: 6rem;
  --space-10: 8rem;

  /* === Typography === */
  --font-fa: 'Vazirmatn', 'IRANSans', 'Tahoma', system-ui, sans-serif;
  --font-en: 'Inter', system-ui, -apple-system, sans-serif;
  --font-display: 'Vazirmatn', 'IRANSans', system-ui, sans-serif;

  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;
  --text-4xl: 2.25rem;
  --text-5xl: 3rem;
  --text-6xl: 3.75rem;
  --text-7xl: 4.5rem;

  --leading-tight: 1.15;
  --leading-snug: 1.35;
  --leading-normal: 1.6;
  --leading-relaxed: 1.75;

  --tracking-tighter: -0.04em;
  --tracking-tight: -0.02em;
  --tracking-normal: 0;
  --tracking-wide: 0.02em;
  --tracking-wider: 0.05em;

  /* === Radius === */
  --radius-sm: 0.375rem;
  --radius-md: 0.625rem;
  --radius-lg: 1rem;
  --radius-xl: 1.5rem;
  --radius-2xl: 2rem;
  --radius-full: 9999px;

  /* === Transitions === */
  --ease-out: cubic-bezier(0.16, 1, 0.3, 1);
  --ease-in-out: cubic-bezier(0.65, 0, 0.35, 1);
  --ease-spring: cubic-bezier(0.34, 1.56, 0.64, 1);
  --ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);

  --duration-fast: 150ms;
  --duration-base: 300ms;
  --duration-slow: 500ms;
  --duration-slower: 800ms;

  /* === Z-Index === */
  --z-base: 1;
  --z-raised: 10;
  --z-sticky: 50;
  --z-overlay: 100;
  --z-modal: 1000;
  --z-loader: 9999;

  /* === Layout === */
  --header-h: 76px;
  --container-max: 1280px;
  --container-px: 1.5rem;
}

/* === Light Theme (default) === */
:root,
[data-theme="light"] {
  /* Brand - Agricultural */
  --color-primary-50:  #f1f8f1;
  --color-primary-100: #dcecdc;
  --color-primary-200: #bbdabb;
  --color-primary-300: #8fc08f;
  --color-primary-400: #5fa15f;
  --color-primary-500: #3f843f;
  --color-primary-600: #2d6930;
  --color-primary-700: #235326;
  --color-primary-800: #1a3e1d;
  --color-primary-900: #112b13;

  --color-accent-500: #d4a742;   /* Wheat gold */
  --color-accent-600: #b08a32;
  --color-soil:       #8b6f47;   /* Earth */
  --color-clay:       #b97455;   /* Clay */

  /* Surfaces */
  --bg:           #fafaf7;       /* Soft cream */
  --bg-elevated:  #ffffff;
  --bg-muted:     #f3f3ed;
  --bg-subtle:    #ebebe3;
  --bg-inverse:   #1a1f17;
  --footer-bg:    #112b13;
  --footer-text:  #f1f8f1;

  --surface:      #ffffff;
  --surface-2:    #f7f7f1;
  --surface-3:    #eeeee5;

  --overlay:      rgba(20, 28, 18, 0.45);
  --scrim:        rgba(20, 28, 18, 0.7);

  /* Text */
  --text:         #1a1f17;
  --text-2:       #3d4639;
  --text-3:       #6b7568;
  --text-muted:   #98a094;
  --text-inverse: #fafaf7;

  /* Borders */
  --border:       #e5e5dc;
  --border-2:     #d4d4c8;
  --border-3:     #b8b8a8;
  --border-focus: var(--color-primary-500);

  /* Decorative */
  --grain-opacity: 0.025;

  /* Shadows */
  --shadow-xs: 0 1px 2px rgba(20, 28, 18, 0.04);
  --shadow-sm: 0 2px 4px rgba(20, 28, 18, 0.05), 0 1px 2px rgba(20, 28, 18, 0.04);
  --shadow-md: 0 4px 12px rgba(20, 28, 18, 0.06), 0 2px 4px rgba(20, 28, 18, 0.04);
  --shadow-lg: 0 12px 32px rgba(20, 28, 18, 0.08), 0 4px 8px rgba(20, 28, 18, 0.04);
  --shadow-xl: 0 24px 64px rgba(20, 28, 18, 0.12), 0 8px 16px rgba(20, 28, 18, 0.06);
  --shadow-glow: 0 0 0 4px rgba(63, 132, 63, 0.12);

  /* Gradients */
  --grad-hero: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(143, 192, 143, 0.18), transparent),
               radial-gradient(ellipse 60% 40% at 100% 100%, rgba(212, 167, 66, 0.10), transparent);
  --grad-leaf: linear-gradient(135deg, var(--color-primary-400), var(--color-primary-700));
  --grad-soil: linear-gradient(135deg, var(--color-accent-500), var(--color-soil));
  --grad-mesh: radial-gradient(at 20% 20%, rgba(143, 192, 143, 0.15) 0px, transparent 50%),
               radial-gradient(at 80% 30%, rgba(212, 167, 66, 0.10) 0px, transparent 50%),
               radial-gradient(at 50% 80%, rgba(95, 161, 95, 0.10) 0px, transparent 50%);
}

/* === Dark Theme === */
[data-theme="dark"] {
  --color-primary-50:  #112b13;
  --color-primary-100: #1a3e1d;
  --color-primary-200: #235326;
  --color-primary-300: #2d6930;
  --color-primary-400: #3f843f;
  --color-primary-500: #5fa15f;
  --color-primary-600: #8fc08f;
  --color-primary-700: #bbdabb;
  --color-primary-800: #dcecdc;
  --color-primary-900: #f1f8f1;

  --color-accent-500: #e8b94d;
  --color-accent-600: #d4a742;
  --color-soil:       #c2a373;
  --color-clay:       #d99070;

  --bg:           #0e130c;
  --bg-elevated:  #161c14;
  --bg-muted:     #1a2117;
  --bg-subtle:    #232a1f;
  --bg-inverse:   #fafaf7;
  --footer-bg:    #0a130a;
  --footer-text:  #f1f8f1;

  --surface:      #161c14;
  --surface-2:    #1d2419;
  --surface-3:    #252c20;

  --overlay:      rgba(0, 0, 0, 0.55);
  --scrim:        rgba(0, 0, 0, 0.75);

  --text:         #f0f3ed;
  --text-2:       #c8d0c2;
  --text-3:       #98a094;
  --text-muted:   #6b7568;
  --text-inverse: #0e130c;

  --border:       #252c20;
  --border-2:     #2f382a;
  --border-3:     #45523e;
  --border-focus: var(--color-primary-400);

  --grain-opacity: 0.04;

  --shadow-xs: 0 1px 2px rgba(0, 0, 0, 0.4);
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.45), 0 1px 2px rgba(0, 0, 0, 0.35);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.5), 0 2px 4px rgba(0, 0, 0, 0.35);
  --shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.55), 0 4px 8px rgba(0, 0, 0, 0.35);
  --shadow-xl: 0 24px 64px rgba(0, 0, 0, 0.65), 0 8px 16px rgba(0, 0, 0, 0.4);
  --shadow-glow: 0 0 0 4px rgba(95, 161, 95, 0.2);

  --grad-hero: radial-gradient(ellipse 80% 50% at 50% 0%, rgba(95, 161, 95, 0.18), transparent),
               radial-gradient(ellipse 60% 40% at 100% 100%, rgba(232, 185, 77, 0.10), transparent);
  --grad-mesh: radial-gradient(at 20% 20%, rgba(95, 161, 95, 0.12) 0px, transparent 50%),
               radial-gradient(at 80% 30%, rgba(232, 185, 77, 0.08) 0px, transparent 50%),
               radial-gradient(at 50% 80%, rgba(95, 161, 95, 0.10) 0px, transparent 50%);
}

/* Respect user's system preference if no choice made */
@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    color-scheme: dark;
  }
}