/* PFAS Registrar Website Styles */
/* Mobile-first, accessible, performance-optimized */

/* ============================================
   CSS VARIABLES & DESIGN TOKENS
   ============================================ */
:root {
  /* Brand Colors */
  --color-navy: #0C2340;
  --color-emerald: #1F7A64;
  --color-light-gray: #F3F5F7;
  --color-charcoal: #1A1D21;
  --color-white: #FFFFFF;
  
  /* Semantic Colors */
  --color-primary: var(--color-emerald);
  --color-secondary: var(--color-navy);
  --color-background: var(--color-white);
  --color-surface: var(--color-light-gray);
  --color-text: var(--color-charcoal);
  --color-text-muted: #6B7280;
  --color-border: #E5E7EB;
  
  /* Status Colors */
  --color-success: #10B981;
  --color-warning: #F59E0B;
  --color-error: #EF4444;
  --color-info: #3B82F6;
  
  /* Typography */
  --font-sans: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-mono: 'SF Mono', Monaco, 'Cascadia Code', monospace;
  
  /* Font Sizes */
  --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 */
  
  /* Spacing */
  --spacing-xs: 0.25rem;   /* 4px */
  --spacing-sm: 0.5rem;    /* 8px */
  --spacing-md: 1rem;      /* 16px */
  --spacing-lg: 1.5rem;    /* 24px */
  --spacing-xl: 2rem;      /* 32px */
  --spacing-2xl: 3rem;     /* 48px */
  --spacing-3xl: 4rem;     /* 64px */
  
  /* Layout */
  --container-max: 1280px;
  --content-max: 720px;
  --radius: 0.375rem;      /* 6px - rounded-md */
  --radius-lg: 0.5rem;     /* 8px */
  --radius-xl: 0.75rem;    /* 12px */
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow: 0 1px 3px 0 rgba(0, 0, 0, 0.1), 0 1px 2px -1px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -2px rgba(0, 0, 0, 0.1);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -4px rgba(0, 0, 0, 0.1);
  
  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-base: 200ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 300ms cubic-bezier(0.4, 0, 0.2, 1);
}

/* ============================================
   RESET & BASE STYLES
   ============================================ */
*, *::before, *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text);
  background-color: var(--color-background);
  min-height: 100vh;
}

/* ============================================
   TYPOGRAPHY
   ============================================ */
h1, h2, h3, h4, h5, h6 {
  font-weight: 600;
  line-height: 1.2;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
}

h1 { font-size: var(--text-4xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }
h5 { font-size: var(--text-lg); }
h6 { font-size: var(--text-base); }

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text);
}

a {
  color: var(--color-primary);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover, a:focus {
  color: #16614E;
  text-decoration: underline;
}

a:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: 2px;
}

/* ============================================
   LAYOUT UTILITIES
   ============================================ */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
  }
}

/* ============================================
   NAVIGATION
   ============================================ */
.site-header {
  position: sticky;
  top: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  box-shadow: var(--shadow-sm);
  z-index: 1000;
}

.nav-container {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: var(--spacing-md) var(--spacing-md);
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-lg);
}

.nav-brand {
  flex-shrink: 0;
}

.logo-link {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-secondary);
  font-weight: 600;
  font-size: var(--text-lg);
  text-decoration: none;
}

.logo-link:hover {
  text-decoration: none;
  color: var(--color-primary);
}

.logo-icon {
  color: var(--color-primary);
  flex-shrink: 0;
}

.logo-text {
  display: none;
}

@media (min-width: 640px) {
  .logo-text {
    display: inline;
  }
}

.nav-toggle {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  padding: 0;
  background: none;
  border: none;
  cursor: pointer;
  color: var(--color-secondary);
  position: relative;
  z-index: 1001;
}

.nav-toggle:hover {
  color: var(--color-primary);
}

.nav-toggle:focus-visible {
  outline: 2px solid var(--color-primary);
  outline-offset: 2px;
  border-radius: var(--radius);
}

.hamburger {
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  position: relative;
  transition: background-color var(--transition-fast);
}

.hamburger::before,
.hamburger::after {
  content: '';
  position: absolute;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  left: 0;
  transition: transform var(--transition-base);
}

.hamburger::before {
  top: -7px;
}

.hamburger::after {
  bottom: -7px;
}

.nav-toggle[aria-expanded="true"] .hamburger {
  background-color: transparent;
}

.nav-toggle[aria-expanded="true"] .hamburger::before {
  transform: rotate(45deg) translateY(7px);
}

.nav-toggle[aria-expanded="true"] .hamburger::after {
  transform: rotate(-45deg) translateY(-7px);
}

.nav-menu {
  list-style: none;
  display: none;
  flex-direction: column;
  gap: var(--spacing-md);
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
  padding: var(--spacing-lg) var(--spacing-md);
  box-shadow: var(--shadow-md);
}

.nav-menu.active {
  display: flex;
}

.nav-link {
  display: block;
  padding: var(--spacing-sm) 0;
  color: var(--color-text);
  font-weight: 500;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link.active {
  color: var(--color-primary);
  text-decoration: none;
}

.nav-cta {
  margin-top: var(--spacing-sm);
}

@media (min-width: 1024px) {
  .nav-container {
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
  }
  
  .nav-toggle {
    display: none;
  }
  
  .nav-menu {
    display: flex;
    flex-direction: row;
    align-items: center;
    position: static;
    border: none;
    box-shadow: none;
    padding: 0;
    gap: var(--spacing-lg);
  }
  
  .nav-link {
    padding: var(--spacing-sm) var(--spacing-md);
  }
  
  .nav-cta {
    margin-top: 0;
  }
}

/* ============================================
   BUTTONS
   ============================================ */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  padding: 0.75rem 1.5rem;
  font-size: var(--text-base);
  font-weight: 500;
  line-height: 1;
  border-radius: var(--radius);
  border: 2px solid transparent;
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

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

.btn-primary {
  background-color: var(--color-primary);
  color: var(--color-white);
  border-color: var(--color-primary);
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: #16614E;
  border-color: #16614E;
  text-decoration: none;
  transform: translateY(-1px);
  box-shadow: var(--shadow-md);
}

.btn-primary:active {
  transform: translateY(0);
}

.btn-secondary {
  background-color: transparent;
  color: var(--color-secondary);
  border-color: var(--color-secondary);
}

.btn-secondary:hover,
.btn-secondary:focus {
  background-color: var(--color-secondary);
  color: var(--color-white);
  text-decoration: none;
}

.btn-lg {
  padding: 1rem 2rem;
  font-size: var(--text-lg);
}

.btn-sm {
  padding: 0.5rem 1rem;
  font-size: var(--text-sm);
}

/* ============================================
   HERO SECTION
   ============================================ */
.hero {
  background: linear-gradient(135deg, var(--color-secondary) 0%, #0A1929 100%);
  color: var(--color-white);
  padding: var(--spacing-3xl) var(--spacing-md);
  text-align: center;
}

@media (min-width: 768px) {
  .hero {
    padding: 5rem var(--spacing-xl) 6rem;
  }
}

.hero-content {
  max-width: 960px;
  margin: 0 auto;
}

.hero-title {
  font-size: var(--text-3xl);
  font-weight: 700;
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

@media (min-width: 768px) {
  .hero-title {
    font-size: var(--text-5xl);
  }
}

.hero-subtitle {
  font-size: var(--text-lg);
  color: rgba(255, 255, 255, 0.9);
  margin-bottom: var(--spacing-xl);
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
  line-height: 1.6;
}

@media (min-width: 768px) {
  .hero-subtitle {
    font-size: var(--text-xl);
  }
}

.hero-features {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-2xl);
  max-width: 640px;
  margin-left: auto;
  margin-right: auto;
}

@media (min-width: 640px) {
  .hero-features {
    flex-direction: row;
    justify-content: center;
    flex-wrap: wrap;
  }
}

.hero-features li {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: rgba(255, 255, 255, 0.95);
  font-size: var(--text-base);
}

.feature-icon {
  color: var(--color-primary);
  flex-shrink: 0;
}

.hero-cta {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  align-items: center;
  justify-content: center;
}

@media (min-width: 640px) {
  .hero-cta {
    flex-direction: row;
    flex-wrap: wrap;
  }
}

/* ============================================
   TRUST STRIP
   ============================================ */
.trust-strip {
  background-color: var(--color-surface);
  padding: var(--spacing-2xl) var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

.trust-category {
  margin-bottom: var(--spacing-xl);
}

.trust-category:last-child {
  margin-bottom: 0;
}

.trust-label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--spacing-md);
  text-align: center;
}

.partner-logos {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  align-items: center;
  gap: var(--spacing-lg);
}

.partner-logo {
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-md) var(--spacing-lg);
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius);
  min-width: 140px;
  height: 60px;
  transition: all var(--transition-fast);
}

.partner-logo:hover {
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.partner-name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  text-align: center;
}

/* ============================================
   SECTIONS
   ============================================ */
.problem-solution {
  padding: var(--spacing-3xl) 0;
}

.content-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
}

@media (min-width: 768px) {
  .content-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-3xl);
  }
}

.problem-card,
.solution-card {
  padding: var(--spacing-2xl);
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
}

.section-title {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-lg);
}

.section-title-center {
  color: var(--color-secondary);
  text-align: center;
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  margin-bottom: var(--spacing-2xl);
}

/* ============================================
   SERVICES
   ============================================ */
.services-preview {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-white);
}

.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
}

@media (min-width: 768px) {
  .services-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-2xl);
  }
}

.service-card {
  padding: var(--spacing-2xl);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  transition: all var(--transition-base);
}

.service-card:hover {
  box-shadow: var(--shadow-lg);
  transform: translateY(-4px);
  border-color: var(--color-primary);
}

.service-icon {
  color: var(--color-primary);
  margin-bottom: var(--spacing-lg);
}

.service-title {
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
  font-size: var(--text-2xl);
}

.service-description {
  color: var(--color-text);
  margin-bottom: var(--spacing-lg);
  line-height: 1.7;
}

.service-link {
  color: var(--color-primary);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-xs);
  transition: gap var(--transition-fast);
}

.service-link:hover {
  gap: var(--spacing-sm);
}

.cta-center {
  text-align: center;
  margin-top: var(--spacing-2xl);
}

/* ============================================
   PAGE HEADER
   ============================================ */
.page-header {
  background-color: var(--color-surface);
  padding: var(--spacing-3xl) 0 var(--spacing-2xl);
  border-bottom: 1px solid var(--color-border);
}

.page-title {
  color: var(--color-secondary);
  font-size: var(--text-4xl);
  margin-bottom: var(--spacing-md);
}

.page-subtitle {
  color: var(--color-text-muted);
  font-size: var(--text-xl);
  max-width: 720px;
}

/* ============================================
   SERVICE DETAIL
   ============================================ */
.service-detail {
  padding: var(--spacing-3xl) 0;
}

.service-detail.alternate {
  background-color: var(--color-surface);
}

.service-detail-content {
  max-width: 960px;
  margin: 0 auto;
}

.service-detail-header {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-2xl);
  align-items: center;
  text-align: center;
}

@media (min-width: 768px) {
  .service-detail-header {
    flex-direction: row;
    align-items: flex-start;
    text-align: left;
  }
}

.service-icon-large {
  color: var(--color-primary);
  flex-shrink: 0;
}

.service-detail-title {
  color: var(--color-secondary);
  font-size: var(--text-3xl);
  margin-bottom: var(--spacing-sm);
}

.service-detail-intro {
  color: var(--color-text-muted);
  font-size: var(--text-lg);
  line-height: 1.6;
}

.service-detail-body {
  color: var(--color-text);
}

.subsection-title {
  color: var(--color-secondary);
  font-size: var(--text-xl);
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-lg);
}

.feature-list {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

.feature-list li {
  display: flex;
  gap: var(--spacing-md);
  align-items: flex-start;
}

.checkmark-icon {
  color: var(--color-primary);
  flex-shrink: 0;
  margin-top: 2px;
}

/* ============================================
   PRICING
   ============================================ */
.pricing-section {
  padding: var(--spacing-3xl) 0;
  background-color: var(--color-white);
}

.pricing-card {
  max-width: 800px;
  margin: 0 auto;
  padding: var(--spacing-2xl);
  background-color: var(--color-surface);
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-lg);
  text-align: center;
}

.pricing-title {
  color: var(--color-secondary);
  font-size: var(--text-3xl);
  margin-bottom: var(--spacing-md);
}

.pricing-description {
  color: var(--color-text);
  font-size: var(--text-lg);
  margin-bottom: var(--spacing-2xl);
}

.pricing-options {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-2xl);
  text-align: left;
}

@media (min-width: 640px) {
  .pricing-options {
    grid-template-columns: 1fr 1fr;
  }
}

.pricing-option {
  padding: var(--spacing-xl);
  background-color: var(--color-white);
  border-radius: var(--radius);
  border: 1px solid var(--color-border);
}

.pricing-option h3 {
  color: var(--color-secondary);
  font-size: var(--text-xl);
  margin-bottom: var(--spacing-sm);
}

.pricing-range {
  color: var(--color-primary);
  font-size: var(--text-2xl);
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

.pricing-cta-text {
  color: var(--color-text-muted);
  margin-bottom: var(--spacing-xl);
  font-size: var(--text-lg);
}

/* ============================================
   FOOTER
   ============================================ */
.site-footer {
  background-color: var(--color-secondary);
  color: rgba(255, 255, 255, 0.9);
  padding: var(--spacing-3xl) 0 var(--spacing-xl);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-2xl);
  margin-bottom: var(--spacing-2xl);
}

@media (min-width: 640px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
}

@media (min-width: 1024px) {
  .footer-grid {
    grid-template-columns: 2fr 1fr 1fr 1fr;
  }
}

.footer-brand {
  margin-bottom: var(--spacing-lg);
}

.footer-logo {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-white);
  font-weight: 600;
  font-size: var(--text-lg);
  margin-bottom: var(--spacing-md);
}

.footer-tagline {
  color: rgba(255, 255, 255, 0.7);
  font-size: var(--text-sm);
  margin-bottom: var(--spacing-xs);
}

.footer-location {
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--text-sm);
}

.footer-heading {
  color: var(--color-white);
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--spacing-md);
}

.footer-links ul {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.footer-links a {
  color: rgba(255, 255, 255, 0.8);
  font-size: var(--text-sm);
  transition: color var(--transition-fast);
}

.footer-links a:hover {
  color: var(--color-white);
  text-decoration: none;
}

.footer-disclaimer {
  padding: var(--spacing-xl);
  background-color: rgba(255, 255, 255, 0.05);
  border-radius: var(--radius);
  margin-bottom: var(--spacing-xl);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.footer-disclaimer p {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--text-sm);
  margin-bottom: 0;
  line-height: 1.6;
}

.footer-bottom {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding-top: var(--spacing-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  font-size: var(--text-sm);
  color: rgba(255, 255, 255, 0.6);
}

@media (min-width: 640px) {
  .footer-bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer-bottom p {
  margin: 0;
}

.footer-accessibility a {
  color: rgba(255, 255, 255, 0.7);
}

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

/* Print styles for PDF export */
@media print {
  .site-header,
  .site-footer,
  .btn,
  .nav-toggle {
    display: none;
  }
  
  body {
    font-size: 12pt;
    line-height: 1.5;
  }
  
  .container {
    max-width: 100%;
  }
}