/* ===================================
   CSS Custom Properties (Variables)
   Template 2: Celestial Bookshelf
   Dramatic dark celestial theme with gold highlights
   
   CUSTOMIZATION GUIDE:
   - To change colors: Update the color values in the Brand Colors section
   - To adjust spacing: Modify the Spacing Scale values
   - To change fonts: Update font-primary and font-secondary with your Google Fonts
   - All values use CSS custom properties for easy theme customization
   =================================== */

:root {
  /* ===== Brand Colors ===== */
  /* Primary blacks - deep, dramatic backgrounds */
  --color-black-primary: #1A1A1A;
  --color-black-secondary: #2C2C2C;
  --color-black-tertiary: #2C2C2C;  /* Changed from #3A3A3A to approved brand color */
  
  /* Gold accents - celestial highlights */
  --color-gold-primary: #D4AF37;
  --color-gold-light: #F4E4C1;
  --color-gold-dark: #D4AF37;  /* Changed from #B8941F to approved brand color */
  
  /* Cream tones - for text and subtle accents */
  --color-cream-primary: #FFF8E7;
  --color-cream-secondary: #F5F5DC;
  
  /* Warm neutrals - supporting colors */
  --color-neutral-warm-1: #D7CCC8;
  --color-neutral-warm-2: #BCAAA4;
  
  /* Semantic colors */
  --color-text-primary: #FFF8E7;
  --color-text-secondary: #D7CCC8;
  --color-text-muted: #BCAAA4;
  --color-background-primary: #1A1A1A;
  --color-background-secondary: #2C2C2C;
  --color-background-tertiary: #2C2C2C;  /* Changed from #3A3A3A to approved brand color */
  --color-accent: #D4AF37;
  --color-error: #D4AF37;  /* Changed from #E57373 to gold for brand consistency */
  --color-success: #D4AF37;  /* Changed from #81C784 to gold for brand consistency */
  
  /* ===== Typography ===== */
  /* Font families */
  --font-primary: 'Playfair Display', Georgia, serif;
  --font-secondary: 'Lato', 'Helvetica Neue', Arial, sans-serif;
  
  /* Font sizes - mobile-first base */
  --font-size-base: 16px;
  --font-size-sm: 0.875rem;    /* 14px */
  --font-size-md: 1rem;         /* 16px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  
  /* Heading sizes - mobile */
  --font-size-h1: 2rem;         /* 32px */
  --font-size-h2: 1.75rem;      /* 28px */
  --font-size-h3: 1.5rem;       /* 24px */
  --font-size-h4: 1.25rem;      /* 20px */
  --font-size-h5: 1.125rem;     /* 18px */
  --font-size-h6: 1rem;         /* 16px */
  
  /* Line heights */
  --line-height-base: 1.6;
  --line-height-heading: 1.2;
  --line-height-tight: 1.4;
  
  /* Font weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* ===== Spacing Scale ===== */
  --spacing-xs: 0.5rem;    /* 8px */
  --spacing-sm: 1rem;      /* 16px */
  --spacing-md: 1.5rem;    /* 24px */
  --spacing-lg: 2rem;      /* 32px */
  --spacing-xl: 3rem;      /* 48px */
  --spacing-2xl: 4rem;     /* 64px */
  --spacing-3xl: 6rem;     /* 96px */
  
  /* ===== Layout ===== */
  --container-max-width: 1200px;
  --container-padding: 1rem;
  --header-height: 80px;
  --footer-min-height: 300px;
  
  /* Grid and columns */
  --grid-gap: 2rem;
  --grid-gap-sm: 1rem;
  
  /* ===== Border and Radius ===== */
  --border-radius-sm: 4px;
  --border-radius-md: 8px;
  --border-radius-lg: 12px;
  --border-width: 1px;
  --border-width-thick: 2px;
  
  /* ===== Shadows ===== */
  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.5);
  --shadow-gold: 0 4px 12px rgba(212, 175, 55, 0.3);
  
  /* ===== Transitions ===== */
  --transition-speed-fast: 0.15s;
  --transition-speed: 0.3s;
  --transition-speed-slow: 0.5s;
  --transition-easing: ease-in-out;
  --transition-easing-smooth: cubic-bezier(0.4, 0, 0.2, 1);
  
  /* ===== Z-index Scale ===== */
  --z-index-dropdown: 100;
  --z-index-sticky: 200;
  --z-index-fixed: 300;
  --z-index-modal-backdrop: 400;
  --z-index-modal: 500;
  --z-index-tooltip: 600;
  
  /* ===== Form Elements ===== */
  --input-height: 48px;
  --input-padding: 0.75rem 1rem;
  --input-border-color: #2C2C2C;  /* Changed from #3A3A3A to approved brand color */
  --input-focus-border-color: #D4AF37;
  --input-background: #2C2C2C;
  --input-text-color: #FFF8E7;
  
  /* ===== Buttons ===== */
  --button-height: 48px;
  --button-padding: 0.75rem 2rem;
  --button-border-radius: 4px;
  
  /* ===== Breakpoints (for reference in media queries) ===== */
  /* These are used in @media queries, not as CSS variables */
  /* --breakpoint-xs: 320px; */
  /* --breakpoint-sm: 576px; */
  /* --breakpoint-md: 768px; */
  /* --breakpoint-lg: 1024px; */
  /* --breakpoint-xl: 1440px; */
  /* --breakpoint-2xl: 1920px; */
}

/* ===== Responsive Typography Adjustments ===== */
/* Tablet and up */
@media (min-width: 768px) {
  :root {
    --font-size-base: 18px;
    --font-size-h1: 3rem;      /* 48px */
    --font-size-h2: 2.5rem;    /* 40px */
    --font-size-h3: 2rem;      /* 32px */
    --font-size-h4: 1.5rem;    /* 24px */
    --font-size-h5: 1.25rem;   /* 20px */
    --container-padding: 2rem;
    --grid-gap: 2.5rem;
  }
}

/* Desktop and up */
@media (min-width: 1024px) {
  :root {
    --font-size-h1: 3.5rem;    /* 56px */
    --font-size-h2: 3rem;      /* 48px */
    --font-size-h3: 2.25rem;   /* 36px */
    --spacing-3xl: 8rem;       /* 128px */
    --container-padding: 3rem;
  }
}

/* Large desktop */
@media (min-width: 1440px) {
  :root {
    --font-size-h1: 4rem;      /* 64px */
    --container-padding: 4rem;
  }
}