/* ========================================
   CSS Custom Properties (Design Tokens)
   MGH ED Patient Portal
   ======================================== */

:root {
  /* MGH Brand Colors - matched to the MGH logo green */
  --brand-primary: #76B043;
  --brand-primary-light: #8EC95E;
  --brand-secondary: #4A7A28;

  /* Section Card Colors (from mockup) */
  --section-green: #D4EDDA;
  --section-green-border: #B1DFBB;
  --section-blue: #D1ECF1;
  --section-blue-border: #A8DAE5;
  --section-purple: #E2D9F3;
  --section-purple-border: #C9B8E8;
  --section-yellow: #FFF3CD;
  --section-yellow-border: #FFE69C;
  --section-pink: #F8D7DA;
  --section-pink-border: #F1AEB5;
  --section-gray: #E8E8E8;
  --section-gray-border: #CCCCCC;
  --section-teal: #D1F0E8;
  --section-teal-border: #A3DFD0;

  /* Semantic Colors */
  --bg: #FFFFFF;
  --bg-surface: #F8F9FA;
  --bg-overlay: rgba(0, 0, 0, 0.6);
  --text: #1A1A1A;
  --text-secondary: #555555;
  --text-muted: #6B6B6B;
  --border: #DDDDDD;
  --focus-ring: #76B043;
  --text-on-brand: #FFFFFF;
  --link: #4A7A28;
  --link-hover: #365A1D;

  /* Spacing Scale */
  --space-2xs: 0.25rem;  /* 4px */
  --space-xs: 0.5rem;    /* 8px */
  --space-sm: 1rem;      /* 16px */
  --space-md: 1.5rem;    /* 24px */
  --space-lg: 2rem;      /* 32px */
  --space-xl: 3rem;      /* 48px */

  /* Typography */
  --font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-size-base: 1rem;       /* 16px */
  --font-size-sm: 0.875rem;     /* 14px */
  --font-size-lg: 1.125rem;     /* 18px */
  --font-size-xl: 1.25rem;      /* 20px */
  --font-size-2xl: 1.5rem;      /* 24px */
  --line-height: 1.6;
  --line-height-tight: 1.3;

  /* Layout */
  --max-width: 600px;
  --border-radius: 12px;
  --border-radius-sm: 8px;
  --header-height: auto;

  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-normal: 250ms ease;
  --transition-slow: 400ms ease;

  /* Shadows */
  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);

  /* Touch Targets */
  --min-touch-target: 44px;

  /* Icons & Arrows */
  --icon-size: 24px;
  --arrow-size: 10px;
  --arrow-size-sm: 8px;
  --arrow-border-width: 2px;

  /* Focus Ring */
  --focus-outline: 3px solid var(--focus-ring);
  --focus-offset: 2px;
}

/* ========================================
   Dark Mode Overrides
   ======================================== */
[data-theme="dark"] {
  --bg: #121212;
  --bg-surface: #1E1E1E;
  --bg-overlay: rgba(0, 0, 0, 0.8);
  --text: #E5E5E5;
  --text-secondary: #AAAAAA;
  --text-muted: #888888;
  --border: #333333;
  --focus-ring: #8EC95E;
  --link: #8EC95E;
  --link-hover: #B2D235;

  /* Dark mode section colors - muted for less eye strain */
  --section-green: #1B3A1B;
  --section-green-border: #2D5A2D;
  --section-blue: #1A2F3A;
  --section-blue-border: #2A4A5A;
  --section-purple: #2A1F3A;
  --section-purple-border: #3D2F55;
  --section-yellow: #3A3520;
  --section-yellow-border: #5A5030;
  --section-pink: #3A1A1A;
  --section-pink-border: #5A2A2A;
  --section-teal: #1A3A30;
  --section-teal-border: #2A5A48;
  --section-gray: #2A2A2A;
  --section-gray-border: #3A3A3A;

  --shadow-sm: 0 1px 3px rgba(0, 0, 0, 0.3);
  --shadow-md: 0 4px 12px rgba(0, 0, 0, 0.4);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.5);
}

/* ========================================
   Font Size Overrides
   ======================================== */
.font-size-medium {
  --font-size-base: 1.125rem;   /* 18px */
  --font-size-sm: 1rem;         /* 16px */
  --font-size-lg: 1.25rem;      /* 20px */
  --font-size-xl: 1.375rem;     /* 22px */
  --font-size-2xl: 1.625rem;    /* 26px */
}

.font-size-large {
  --font-size-base: 1.25rem;    /* 20px */
  --font-size-sm: 1.125rem;     /* 18px */
  --font-size-lg: 1.375rem;     /* 22px */
  --font-size-xl: 1.5rem;       /* 24px */
  --font-size-2xl: 1.75rem;     /* 28px */
}