/* What's the Line Base CSS - Design System Foundation */
/* Last Updated: December 2024 */

/* ========================================
   CSS CUSTOM PROPERTIES (CSS VARIABLES)
   ======================================== */

:root {
  /* Base Colors */
  --color-black: #000000;
  --color-white: #FFFFFF;
  --color-gray-50: #F9FAFB;
  --color-gray-100: #F3F4F6;
  --color-gray-200: #E5E7EB;
  --color-gray-300: #D1D5DB;
  --color-gray-400: #9CA3AF;
  --color-gray-500: #6B7280;
  --color-gray-600: #4B5563;
  --color-gray-700: #374151;
  --color-gray-800: #1F2937;
  --color-gray-900: #111827;

  /* Accent Colors */
  --color-opportunity-green: #16A34A;
  --color-warning-yellow: #F59E0B;
  --color-caution-red: #F87171;

  /* Typography */
  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  --font-weight-regular: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Font Sizes */
  --font-size-xs: 0.75rem;    /* 12px */
  --font-size-sm: 0.875rem;   /* 14px */
  --font-size-base: 1rem;     /* 16px */
  --font-size-lg: 1.125rem;   /* 18px */
  --font-size-xl: 1.25rem;    /* 20px */
  --font-size-2xl: 1.5rem;    /* 24px */
  --font-size-3xl: 2rem;      /* 32px */

  /* Spacing System (8px base) */
  --space-1: 0.5rem;   /* 8px */
  --space-2: 1rem;     /* 16px */
  --space-3: 1.5rem;   /* 24px */
  --space-4: 2rem;     /* 32px */
  --space-5: 2.5rem;   /* 40px */
  --space-6: 3rem;     /* 48px */
  --space-8: 4rem;     /* 64px */

  /* Component Values */
  --border-radius: 8px;
  --border-radius-sm: 4px;
  --border-radius-lg: 12px;
  --border-width: 1px;
  --border-width-thick: 2px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-base: 0 2px 4px 0 rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1);

  /* Touch Targets */
  --touch-target-min: 48px;
  --button-height-sm: 32px;
  --button-height-md: 40px;
  --button-height-lg: 48px;

  /* Transitions */
  --transition-fast: 150ms ease-in-out;
  --transition-base: 250ms ease-in-out;
  --transition-slow: 350ms ease-in-out;
}

/* ========================================
   RESET & BASE STYLES
   ======================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  line-height: 1.15;
  -webkit-text-size-adjust: 100%;
}

body {
  margin: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-regular);
  line-height: 1.5;
  color: var(--color-black);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

/* Main content should grow to fill available space */
.main-content {
  flex: 1;
}

/* ========================================
   TYPOGRAPHY HIERARCHY
   ======================================== */

h1, h2, h3, h4, h5, h6 {
  margin: 0 0 var(--space-2) 0;
  font-weight: var(--font-weight-semibold);
  line-height: 1.25;
  color: var(--color-black);
}

h1 {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
}

h2 {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-semibold);
}

h3 {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
}

h4 {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-medium);
}

p {
  margin: 0 0 var(--space-2) 0;
  color: var(--color-black);
}

/* Text Utilities */
.text-large {
  font-size: var(--font-size-base);
}

.text-small {
  font-size: var(--font-size-sm);
}

.text-xs {
  font-size: var(--font-size-xs);
}

.text-secondary {
  color: var(--color-gray-600);
}

.text-muted {
  color: var(--color-gray-500);
}

.text-success {
  color: var(--color-opportunity-green);
}

.text-warning {
  color: var(--color-warning-yellow);
}

.text-danger {
  color: var(--color-caution-red);
}

.font-medium {
  font-weight: var(--font-weight-medium);
}

.font-semibold {
  font-weight: var(--font-weight-semibold);
}

.font-bold {
  font-weight: var(--font-weight-bold);
}

/* Data/Numbers Typography */
.text-data {
  font-weight: var(--font-weight-bold);
  font-variant-numeric: tabular-nums;
}

.text-data-large {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  font-variant-numeric: tabular-nums;
}

.text-data-small {
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  font-variant-numeric: tabular-nums;
}

/* ========================================
   FORM SYSTEM
   ======================================== */

.form-control {
  display: block;
  width: 100%;
  padding: var(--space-3);
  font-size: var(--font-size-base);
  font-family: var(--font-family-base);
  line-height: 1.5;
  color: var(--color-black);
  background-color: var(--color-white);
  border: var(--border-width) solid var(--color-gray-300);
  border-radius: var(--border-radius);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  outline: none;
  border-color: var(--color-opportunity-green);
  box-shadow: 0 0 0 3px rgba(22, 163, 74, 0.1);
}

.form-control:disabled {
  background-color: var(--color-gray-100);
  opacity: 1;
}

.form-control::placeholder {
  color: var(--color-gray-500);
}

/* Form Groups */
.form-group {
  margin-bottom: var(--space-4);
}

.form-group label {
  display: block;
  margin-bottom: var(--space-1);
  font-weight: var(--font-weight-medium);
  color: var(--color-black);
}

/* Alert System */
.alert {
  padding: var(--space-3);
  margin-bottom: var(--space-4);
  border: var(--border-width) solid transparent;
  border-radius: var(--border-radius);
}

.alert-danger {
  color: #721c24;
  background-color: #f8d7da;
  border-color: #f5c6cb;
}

.alert-success {
  color: #155724;
  background-color: #d4edda;
  border-color: #c3e6cb;
}

.alert-warning {
  color: #856404;
  background-color: #fff3cd;
  border-color: #ffeaa7;
}

/* ========================================
   BUTTON SYSTEM
   ======================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-2) var(--space-3);
  font-family: var(--font-family-base);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  line-height: 1;
  text-decoration: none;
  border: var(--border-width) solid transparent;
  border-radius: var(--border-radius);
  cursor: pointer;
  transition: all var(--transition-fast);
  min-height: var(--touch-target-min);
  gap: var(--space-1);
}

.btn:focus {
  outline: 2px solid var(--color-opportunity-green);
  outline-offset: 2px;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

/* Primary Actions (Opportunity Green) */
.btn-primary {
  background-color: var(--color-opportunity-green);
  border-color: var(--color-opportunity-green);
  color: var(--color-white);
}

.btn-primary:hover:not(:disabled) {
  background-color: #15803D;
  border-color: #15803D;
}

/* Secondary Actions (Black outline) */
.btn-secondary {
  background-color: transparent;
  border-color: var(--color-black);
  color: var(--color-black);
}

.btn-secondary:hover:not(:disabled) {
  background-color: var(--color-gray-100);
}

/* Social Actions (Black solid) */
.btn-social {
  background-color: var(--color-black);
  border-color: var(--color-black);
  color: var(--color-white);
}

.btn-social:hover:not(:disabled) {
  background-color: var(--color-gray-800);
  border-color: var(--color-gray-800);
}

/* Subtle Actions (Gray) */
.btn-subtle {
  background-color: transparent;
  border-color: var(--color-gray-300);
  color: var(--color-gray-600);
}

.btn-subtle:hover:not(:disabled) {
  background-color: var(--color-gray-100);
  border-color: var(--color-gray-400);
}

/* Button Sizes */
.btn-sm {
  height: var(--button-height-sm);
  padding: var(--space-1) var(--space-2);
  font-size: var(--font-size-xs);
}

.btn-md {
  height: var(--button-height-md);
  padding: var(--space-2) var(--space-3);
  font-size: var(--font-size-sm);
}

.btn-lg {
  height: var(--button-height-lg);
  padding: var(--space-2) var(--space-4);
  font-size: var(--font-size-base);
}

/* ========================================
   LAYOUT UTILITIES
   ======================================== */

.container {
  width: 100%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--space-2);
}

.section {
  padding: var(--space-4) 0;
}

.section-lg {
  padding: var(--space-6) 0;
}

/* Spacing Utilities */
.mt-1 { margin-top: var(--space-1); }
.mt-2 { margin-top: var(--space-2); }
.mt-3 { margin-top: var(--space-3); }
.mt-4 { margin-top: var(--space-4); }

.mb-1 { margin-bottom: var(--space-1); }
.mb-2 { margin-bottom: var(--space-2); }
.mb-3 { margin-bottom: var(--space-3); }
.mb-4 { margin-bottom: var(--space-4); }

.p-1 { padding: var(--space-1); }
.p-2 { padding: var(--space-2); }
.p-3 { padding: var(--space-3); }
.p-4 { padding: var(--space-4); }

/* Responsive Display Utilities */
.desktop-only {
  display: block;
}

.mobile-only {
  display: none;
}

@media (max-width: 767px) {
  .desktop-only {
    display: none !important;
  }
  
  .mobile-only {
    display: block !important;
  }
}

/* ========================================
   RESPONSIVE DESIGN
   ======================================== */

/* Mobile-first approach */
@media (min-width: 768px) {
  .container {
    padding: 0 var(--space-3);
  }
  
  h1 {
    font-size: 2.5rem; /* 40px */
  }
  
  h2 {
    font-size: 1.875rem; /* 30px */
  }
}

@media (min-width: 1024px) {
  .container {
    padding: 0 var(--space-4);
  }
}

/* ========================================
   ACCESSIBILITY
   ======================================== */

/* Focus states */
*:focus {
  outline: 2px solid var(--color-opportunity-green);
  outline-offset: 2px;
}

/* Screen reader only content */
.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;
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* ========================================
   COMPONENT IMPORTS
   ======================================== */

/* Import component styles */
@import url('components/navigation.css');
@import url('components/footer.css');
@import url('components/alerts.css');
@import url('components/forms.css');

/* ========================================
   PRINT STYLES
   ======================================== */

@media print {
  *,
  *::before,
  *::after {
    background: transparent !important;
    color: black !important;
    box-shadow: none !important;
    text-shadow: none !important;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.3;
  }
  
  h1, h2, h3 {
    page-break-after: avoid;
  }
}