/**
 * C&S Drainage + Civil Brand Variables
 *
 * CSS Custom Properties for consistent brand theming
 * Brand colors: #F2901C (Construction Orange), #1A1A1A (Charcoal Black), #FFFFFF (White)
 */

:root {
  /* === PRIMARY BRAND COLORS === */
  --csd-orange: #F2901C;          /* Construction Orange - Primary accent/CTA color */
  --csd-yellow: #F2901C;          /* Legacy alias (was yellow) - now Construction Orange */
  --csd-grey: #1A1A1A;            /* Charcoal Black - Secondary brand color */
  --csd-white: #FFFFFF;           /* Pure White */
  
  /* === SEMANTIC COLOR SYSTEM === */
  --csd-text-primary: var(--csd-grey);            /* Main text color */
  --csd-text-secondary: #6B6D6F;                  /* Secondary text (lighter grey) */
  --csd-text-light: #FFFFFF;                      /* Light text on dark backgrounds */
  --csd-text-muted: #7B7D7F;                      /* Muted/disabled text */
  
  --csd-bg-primary: var(--csd-white);             /* Main background */
  --csd-bg-secondary: #F8F8F8;                    /* Light gray background */
  --csd-bg-dark: var(--csd-grey);                 /* Dark background sections */
  --csd-bg-accent: var(--csd-yellow);             /* Accent background */
  
  /* === INTERACTIVE ELEMENTS === */
  --csd-accent: var(--csd-orange);                /* Primary accent/CTA color */
  --csd-accent-hover: #D97C13;                    /* Darker orange for hover states */
  --csd-accent-light: #FDEBD3;                    /* Light orange tint for subtle accents */

  --csd-link: var(--csd-grey);                    /* Link color */
  --csd-link-hover: var(--csd-accent-hover);      /* Link hover color (darker orange) */
  --csd-link-visited: #2A2B2C;                    /* Visited link color (darker grey) */
  
  /* === BORDER AND DIVIDER COLORS === */
  --csd-border-light: #E5E5E5;                    /* Light borders */
  --csd-border-medium: #CCCCCC;                   /* Medium borders */
  --csd-border-dark: var(--csd-grey);             /* Dark/prominent borders */
  
  /* === STATUS AND FEEDBACK COLORS === */
  --csd-success: #059669;                          /* Success states */
  --csd-success-bg: #ECFDF5;                       /* Success background */
  --csd-warning: #D97706;                          /* Warning states */
  --csd-warning-bg: #FFFBEB;                       /* Warning background */
  --csd-error: #DC2626;                            /* Error states */
  --csd-error-bg: #FEF2F2;                         /* Error background */
  --csd-info: var(--csd-grey);                    /* Info states */
  --csd-info-bg: #F5F5F5;                         /* Info background */
  
  /* === TYPOGRAPHY SYSTEM === */
  --csd-font-size-base: clamp(1.125rem, 1rem + 0.5vw, 1.25rem);      /* 18-20px base */
  --csd-font-size-sm: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);      /* 16-17px small */
  --csd-font-size-lg: clamp(1.375rem, 1.25rem + 0.5vw, 1.5rem);      /* 22-24px large */
  --csd-font-size-xl: clamp(1.625rem, 1.5rem + 0.625vw, 1.875rem);   /* 26-30px extra large */
  --csd-font-size-2xl: clamp(2rem, 1.75rem + 1vw, 2.25rem);          /* 32-36px 2x large */
  --csd-font-size-3xl: clamp(2.5rem, 2.25rem + 1.25vw, 3rem);        /* 40-48px 3x large */
  
  /* === SHADOW SYSTEM === */
  --csd-shadow-sm: 0 1px 2px 0 rgba(26, 26, 26, 0.05);
  --csd-shadow-md: 0 4px 6px -1px rgba(26, 26, 26, 0.1), 0 2px 4px -1px rgba(26, 26, 26, 0.06);
  --csd-shadow-lg: 0 10px 15px -3px rgba(26, 26, 26, 0.1), 0 4px 6px -2px rgba(26, 26, 26, 0.05);
  --csd-shadow-xl: 0 20px 25px -5px rgba(26, 26, 26, 0.1), 0 10px 10px -5px rgba(26, 26, 26, 0.04);
  
  /* === SPACING SYSTEM === */
  /* Base spacing scale (8px system) */
  --csd-space-0: 0;           /* 0px - No spacing */
  --csd-space-xs: 0.25rem;    /* 4px - Minimal spacing */
  --csd-space-sm: 0.5rem;     /* 8px - Small spacing */
  --csd-space-md: 1rem;       /* 16px - Medium spacing */
  --csd-space-lg: 1.5rem;     /* 24px - Large spacing */
  --csd-space-xl: 2rem;       /* 32px - Extra large spacing */
  --csd-space-2xl: 3rem;      /* 48px - Section spacing */
  --csd-space-3xl: 4rem;      /* 64px - Large section spacing */
  --csd-space-4xl: 5rem;      /* 80px - Hero section spacing */
  --csd-space-5xl: 6rem;      /* 96px - Major section spacing */
  
  /* === SEMANTIC SPACING === */
  /* Content spacing */
  --csd-content-gap: var(--csd-space-md);          /* Gap between content elements */
  --csd-content-gap-sm: var(--csd-space-sm);       /* Small gap between content */
  --csd-content-gap-lg: var(--csd-space-lg);       /* Large gap between content */
  
  /* Section spacing */
  --csd-section-padding: var(--csd-space-3xl);     /* Standard section padding */
  --csd-section-padding-sm: var(--csd-space-2xl);  /* Small section padding */
  --csd-section-padding-lg: var(--csd-space-4xl);  /* Large section padding */
  --csd-section-gap: var(--csd-space-2xl);         /* Gap between sections */
  
  /* Container spacing */
  --csd-container-padding: var(--csd-space-md);    /* Container side padding */
  --csd-container-padding-sm: var(--csd-space-sm); /* Small container padding */
  --csd-container-padding-lg: var(--csd-space-xl); /* Large container padding */
  
  /* Component spacing */
  --csd-component-gap: var(--csd-space-lg);        /* Gap between components */
  --csd-component-padding: var(--csd-space-md);    /* Internal component padding */
  --csd-component-margin: var(--csd-space-lg);     /* External component margin */
  
  /* Form spacing */
  --csd-form-gap: var(--csd-space-md);             /* Gap between form elements */
  --csd-form-padding: var(--csd-space-sm);         /* Form input padding */
  --csd-form-margin: var(--csd-space-lg);          /* Form group margin */
  
  /* === RESPONSIVE SPACING MODIFIERS === */
  /* Mobile-first responsive spacing */
  --csd-space-responsive-xs: clamp(0.125rem, 0.5vw, 0.25rem);  /* 2-4px */
  --csd-space-responsive-sm: clamp(0.25rem, 1vw, 0.5rem);      /* 4-8px */
  --csd-space-responsive-md: clamp(0.5rem, 2vw, 1rem);         /* 8-16px */
  --csd-space-responsive-lg: clamp(0.75rem, 3vw, 1.5rem);      /* 12-24px */
  --csd-space-responsive-xl: clamp(1rem, 4vw, 2rem);           /* 16-32px */
  --csd-space-responsive-2xl: clamp(1.5rem, 6vw, 3rem);        /* 24-48px */
  --csd-space-responsive-3xl: clamp(2rem, 8vw, 4rem);          /* 32-64px */
  
  /* === GRID SYSTEM === */
  /* Container max-widths */
  --csd-container-sm: 640px;
  --csd-container-md: 768px;
  --csd-container-lg: 1024px;
  --csd-container-xl: 1280px;
  --csd-container-2xl: 1536px;
  --csd-container-fluid: 100%;
  
  /* Grid gaps */
  --csd-grid-gap: var(--csd-space-md);           /* Standard grid gap */
  --csd-grid-gap-sm: var(--csd-space-sm);        /* Small grid gap */
  --csd-grid-gap-lg: var(--csd-space-lg);        /* Large grid gap */
  
  /* Layout widths */
  --csd-content-width: 65ch;                     /* Optimal reading width */
  --csd-content-width-wide: 80ch;                /* Wide content width */
  --csd-content-width-narrow: 45ch;              /* Narrow content width */

  /* === RESPONSIVE BREAKPOINTS === */
  --csd-breakpoint-sm: 640px;
  --csd-breakpoint-md: 768px;
  --csd-breakpoint-lg: 1024px;
  --csd-breakpoint-xl: 1280px;
  --csd-breakpoint-2xl: 1536px;
  
  /* === Z-INDEX SYSTEM === */
  --csd-z-dropdown: 1000;
  --csd-z-sticky: 1020;
  --csd-z-fixed: 1030;
  --csd-z-modal-backdrop: 1040;
  --csd-z-modal: 1050;
  --csd-z-popover: 1060;
  --csd-z-tooltip: 1070;
  --csd-z-toast: 1080;
}

/* === HIGH CONTRAST MODE SUPPORT === */
@media (prefers-contrast: high) {
  :root {
    --csd-text-primary: #000000;
    --csd-text-secondary: #000000;
    --csd-border-light: #000000;
    --csd-border-medium: #000000;
  }
}

/* === DARK MODE ===
 * Intentionally not overridden: the site is designed as a light theme
 * (charcoal text on white). Auto-flipping tokens via prefers-color-scheme
 * produced broken combinations (light text on components with hardcoded
 * light backgrounds), so dark-mode users get the standard light design. */

/* === ACCESSIBILITY UTILITIES === */
.csd-sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.csd-focus-visible:focus-visible {
  outline: 2px solid var(--csd-grey);
  outline-offset: 2px;
}

/* === UTILITY CLASSES === */
.csd-text-primary { color: var(--csd-text-primary); }
.csd-text-secondary { color: var(--csd-text-secondary); }
.csd-text-light { color: var(--csd-text-light); }
.csd-text-muted { color: var(--csd-text-muted); }

.csd-bg-primary { background-color: var(--csd-bg-primary); }
.csd-bg-secondary { background-color: var(--csd-bg-secondary); }
.csd-bg-dark { background-color: var(--csd-bg-dark); }
.csd-bg-accent { background-color: var(--csd-bg-accent); }