/* ==========================================================================
   ULTRATRAIL BLOG DESIGN SYSTEM - VARIABLES & TOKENS
   Theme: Mountain & Alpine Nature (Forest, Slate, Granite, Summit Amber)
   ========================================================================== */

:root {
  /* Nature Color Palette */
  --color-forest-950: #0d1a13;
  --color-forest-900: #14281d;
  --color-forest-800: #1c3829;
  --color-forest-700: #254b37;
  --color-forest-600: #336148;
  --color-forest-500: #427c5d;
  --color-forest-400: #589b77;

  --color-moss-500: #6b8f71;
  --color-moss-400: #85a98b;
  --color-moss-200: #c9dbc9;
  --color-moss-100: #eaf1eb;

  --color-stone-950: #121415;
  --color-stone-900: #1c1f21;
  --color-stone-800: #282c2f;
  --color-stone-700: #3f454a;
  --color-stone-500: #6c757d;
  --color-stone-300: #c2c7cc;
  --color-stone-200: #e2e5e8;
  --color-stone-100: #f1f3f5;
  --color-stone-50:  #f8f9fa;

  --color-summit-amber: #e07a5f;
  --color-summit-orange: #d95d39;
  --color-summit-yellow: #f4a261;
  --color-alpine-glacier: #3d8dae;
  --color-alpine-mist: #eaf4f4;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Outfit", -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  --font-mono: "SF Mono", "Fira Code", "JetBrains Mono", Menlo, Consolas, monospace;

  --text-xs: 0.75rem;     /* 12px */
  --text-sm: 0.875rem;    /* 14px */
  --text-base: 1rem;       /* 16px */
  --text-lg: 1.125rem;    /* 18px */
  --text-xl: 1.25rem;     /* 20px */
  --text-2xl: 1.5rem;     /* 24px */
  --text-3xl: 1.875rem;   /* 30px */
  --text-4xl: 2.25rem;    /* 36px */
  --text-5xl: 3rem;       /* 48px */

  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* 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 */

  /* Radii */
  --radius-sm: 4px;
  --radius-md: 8px;
  --radius-lg: 12px;
  --radius-xl: 16px;
  --radius-full: 9999px;

  /* Layout */
  --container-max-width: 1240px;
  --container-article-width: 840px;
  --header-height: 72px;

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-smooth: 350ms cubic-bezier(0.16, 1, 0.3, 1);
}

/* Light Theme (Default: Crisp Alpine Morning) */
:root, [data-theme="light"] {
  color-scheme: light;

  --bg-primary: #faf9f6;             /* Crisp natural off-white */
  --bg-secondary: #f0eee9;           /* Soft stone tint */
  --bg-card: #ffffff;
  --bg-card-hover: #ffffff;
  --bg-surface: #e8e6df;
  --bg-input: #ffffff;

  --text-primary: #1c2421;           /* Deep pine black */
  --text-secondary: #4a5550;         /* Slate moss */
  --text-muted: #718079;             /* Granite mist */
  --text-inverse: #ffffff;

  --border-subtle: #e5e2da;
  --border-medium: #cfcac0;
  --border-strong: #9da39e;

  --accent-primary: #254b37;         /* Evergreen primary */
  --accent-primary-hover: #1c3829;
  --accent-secondary: #e07a5f;       /* Summit trail blaze */
  --accent-secondary-hover: #c96248;
  --accent-glow: rgba(37, 75, 55, 0.1);

  --badge-bg: #eaf1eb;
  --badge-text: #254b37;
  --badge-border: #c9dbc9;

  --elevation-shadow-sm: 0 1px 3px rgba(28, 36, 33, 0.06);
  --elevation-shadow-md: 0 4px 14px rgba(28, 36, 33, 0.08);
  --elevation-shadow-lg: 0 12px 28px rgba(28, 36, 33, 0.12);

  --hero-pattern-opacity: 0.07;
}

/* Dark Theme (Alpine Night / High Camp) */
[data-theme="dark"] {
  color-scheme: dark;

  --bg-primary: #0e1512;             /* Deepest pine slate */
  --bg-secondary: #141f1a;           /* Forest night surface */
  --bg-card: #182620;
  --bg-card-hover: #1f3028;
  --bg-surface: #22342c;
  --bg-input: #121c17;

  --text-primary: #f2f5f3;           /* Crisp moonlight */
  --text-secondary: #b5c4bc;         /* Glacier fog */
  --text-muted: #7c9185;             /* Lichen stone */
  --text-inverse: #0e1512;

  --border-subtle: #24382e;
  --border-medium: #355042;
  --border-strong: #4e7360;

  --accent-primary: #589b77;         /* Glowing moss emerald */
  --accent-primary-hover: #6eb78f;
  --accent-secondary: #e07a5f;       /* Beacon amber */
  --accent-secondary-hover: #f08f75;
  --accent-glow: rgba(88, 155, 119, 0.2);

  --badge-bg: #1c3829;
  --badge-text: #85a98b;
  --badge-border: #254b37;

  --elevation-shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.35);
  --elevation-shadow-md: 0 4px 16px rgba(0, 0, 0, 0.45);
  --elevation-shadow-lg: 0 12px 32px rgba(0, 0, 0, 0.6);

  --hero-pattern-opacity: 0.12;
}