/* ================================================================
   MainStreetDNS — Production Stylesheet
   Palette:    Option B (Heritage Blue)
   Expression: B-3
   Version:    2026-04-07
   ================================================================

   DESIGN PARAMETERS (B-3 Expression Level)
   ------------------------------------------
   - Refined type hierarchy with clear weight contrast
   - Subtle background gradients on hero and CTA band
   - Card surfaces with soft box-shadow elevation
   - Hover transitions (200ms ease)
   - Generous whitespace rhythm
   - No decorative imagery, icons, metaphors, or symbolic visuals
   - Focus-visible outlines on all interactive elements
   - Fully semantic, WCAG 2.1 AA compliant color contrast
   ================================================================ */


/* ----------------------------------------------------------------
   0. CUSTOM PROPERTIES — Option B (Heritage Blue) Palette
   ---------------------------------------------------------------- */
:root {
  /* --- Primary Blue Scale --- */
  --color-blue-900:   #0F2440;
  --color-blue-800:   #1B3A5C;
  --color-blue-700:   #244B75;
  --color-blue-600:   #2C5A8A;
  --color-blue-500:   #3D7ABF;
  --color-blue-400:   #5A9AD6;
  --color-blue-300:   #89BBE5;
  --color-blue-200:   #B8D4F0;
  --color-blue-100:   #DAE8F5;
  --color-blue-50:    #EEF4FA;

  /* --- Warm Accent (Gold) --- */
  --color-gold-600:   #8B6914;
  --color-gold-500:   #B8860B;
  --color-gold-400:   #C49A2A;
  --color-gold-300:   #D4B04A;
  --color-gold-100:   #F5ECD4;

  /* --- Neutrals --- */
  --color-white:      #FFFFFF;
  --color-gray-50:    #F7F9FC;
  --color-gray-100:   #EDF1F7;
  --color-gray-200:   #D1DAE6;
  --color-gray-300:   #B0BDCF;
  --color-gray-500:   #64748B;
  --color-gray-700:   #3E4C5E;
  --color-gray-900:   #1A2332;

  /* --- Semantic Assignments --- */
  --color-primary:       var(--color-blue-800);
  --color-primary-dark:  var(--color-blue-900);
  --color-primary-mid:   var(--color-blue-600);
  --color-primary-light: var(--color-blue-100);
  --color-accent:        var(--color-gold-500);
  --color-accent-hover:  var(--color-gold-600);
  --color-bg:            var(--color-white);
  --color-bg-alt:        var(--color-gray-50);
  --color-surface:       var(--color-white);
  --color-border:        var(--color-gray-200);
  --color-text:          var(--color-gray-900);
  --color-text-secondary:var(--color-gray-700);
  --color-text-muted:    var(--color-gray-500);

  /* --- Typography --- */
  --font-sans:   "Segoe UI", system-ui, -apple-system, "Helvetica Neue", Arial, sans-serif;
  --font-weight-normal:  400;
  --font-weight-medium:  500;
  --font-weight-semi:    600;
  --font-weight-bold:    700;

  /* --- Spacing Scale (8px base) --- */
  --space-xs:    0.25rem;
  --space-sm:    0.5rem;
  --space-md:    1rem;
  --space-lg:    1.5rem;
  --space-xl:    2rem;
  --space-2xl:   3rem;
  --space-3xl:   4rem;
  --space-4xl:   6rem;

  /* --- Layout --- */
  --container-max:  72rem;
  --radius-sm:  4px;
  --radius-md:  6px;
  --radius-lg:  8px;

  /* --- Elevation (B-3) --- */
  --shadow-card:    0 1px 3px rgba(27, 58, 92, 0.08),
                    0 4px 12px rgba(27, 58, 92, 0.06);
  --shadow-card-hover: 0 2px 6px rgba(27, 58, 92, 0.10),
                       0 8px 24px rgba(27, 58, 92, 0.08);

  /* --- Transitions --- */
  --transition-fast: 200ms ease;
}


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

html {
  font-size: 100%;
  scroll-behavior: smooth;
  -webkit-text-size-adjust: 100%;
}

body {
  font-family: var(--font-sans);
  font-size: 1rem;
  font-weight: var(--font-weight-normal);
  line-height: 1.625;
  color: var(--color-text);
  background-color: var(--color-bg);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

img {
  max-width: 100%;
  height: 46px;
  display: block;
}

a {
  color: var(--color-primary-mid);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 2px;
  transition: color var(--transition-fast);
}

a:hover {
  color: var(--color-primary-dark);
}

/* --- Focus-Visible (Accessibility) --- */
:focus-visible {
  outline: 3px solid var(--color-blue-400);
  outline-offset: 2px;
  border-radius: var(--radius-sm);
}

:focus:not(:focus-visible) {
  outline: none;
}

ul, ol {
  list-style: none;
}

h1, h2, h3, h4, h5, h6 {
  line-height: 1.25;
  font-weight: var(--font-weight-bold);
  color: var(--color-text);
}


/* ----------------------------------------------------------------
   2. LAYOUT — Container
   ---------------------------------------------------------------- */
.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-lg);
}


/* ----------------------------------------------------------------
   3. SITE HEADER
   ---------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 100;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-border);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 4rem;
}

/* --- Logo --- */
.site-logo {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  line-height: 1.15;
}

.logo-wordmark {
  font-size: 1.25rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-primary);
  letter-spacing: -0.01em;
}

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

.logo-tagline {
  font-size: 0.6875rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-muted);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

/* --- Navigation --- */
.nav-list {
  display: flex;
  align-items: center;
  gap: var(--space-xs);
}

.nav-link {
  display: inline-block;
  padding: var(--space-sm) var(--space-md);
  font-size: 0.9375rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-text-secondary);
  text-decoration: none;
  border-radius: var(--radius-md);
  transition: color var(--transition-fast),
              background-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-primary);
  background-color: var(--color-blue-50);
}

.nav-link--cta {
  color: var(--color-white);
  background-color: var(--color-primary);
  margin-left: var(--space-sm);
}

.nav-link--cta:hover {
  color: var(--color-white);
  background-color: var(--color-primary-dark);
}

/* --- Mobile Toggle --- */
.nav-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: var(--space-sm);
}

.nav-toggle-bar {
  display: block;
  width: 22px;
  height: 2px;
  background-color: var(--color-primary);
  border-radius: 1px;
  transition: transform var(--transition-fast),
              opacity var(--transition-fast);
}


/* ----------------------------------------------------------------
   4. HERO
   ---------------------------------------------------------------- */
.hero {
  background: linear-gradient(
    168deg,
    var(--color-blue-900) 0%,
    var(--color-blue-800) 55%,
    var(--color-blue-700) 100%
  );
  color: var(--color-white);
  padding-block: var(--space-4xl);
}

.hero-inner {
  max-width: 60rem;
}

.hero-heading {
  font-size: clamp(2rem, 4vw + 0.5rem, 3rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  letter-spacing: -0.015em;
  line-height: 1.15;
  margin-bottom: var(--space-lg);
}

.hero-subheading {
  font-size: 1.125rem;
  line-height: 1.65;
  color: var(--color-blue-200);
  margin-bottom: var(--space-xl);
  max-width: 44rem;
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
}


/* ----------------------------------------------------------------
   5. BUTTONS
   ---------------------------------------------------------------- */
.btn {
  display: inline-block;
  padding: 0.75rem 1.75rem;
  font-family: var(--font-sans);
  font-size: 0.9375rem;
  font-weight: var(--font-weight-semi);
  line-height: 1.4;
  text-decoration: none;
  border-radius: var(--radius-md);
  border: 2px solid transparent;
  cursor: pointer;
  transition: background-color var(--transition-fast),
              color var(--transition-fast),
              border-color var(--transition-fast),
              box-shadow var(--transition-fast);
}

.btn--primary {
  color: var(--color-primary-dark);
  background-color: var(--color-gold-400);
  border-color: var(--color-gold-400);
}

.btn--primary:hover {
  background-color: var(--color-gold-500);
  border-color: var(--color-gold-500);
  color: var(--color-white);
}

.btn--secondary {
  color: var(--color-white);
  background-color: transparent;
  border-color: var(--color-blue-300);
}

.btn--secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  border-color: var(--color-white);
}

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

.btn--secondary-light:hover {
  background-color: var(--color-blue-50);
  border-color: var(--color-blue-50);
}

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

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


/* ----------------------------------------------------------------
   6. SECTION PATTERN
   ---------------------------------------------------------------- */
.section-header {
  text-align: center;
  margin-bottom: var(--space-2xl);
}

.section-title {
  font-size: clamp(1.5rem, 2.5vw + 0.25rem, 2rem);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.section-subtitle {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  max-width: 36rem;
  margin-inline: auto;
}


/* ----------------------------------------------------------------
   7. SERVICES
   ---------------------------------------------------------------- */
.services {
  padding-block: var(--space-4xl);
  background-color: var(--color-bg);
}

.services-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.service-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl) var(--space-lg);
  box-shadow: var(--shadow-card);
  transition: box-shadow var(--transition-fast),
              transform var(--transition-fast);
}

.service-card:hover {
  box-shadow: var(--shadow-card-hover);
  transform: translateY(-2px);
}

.service-card__title {
  font-size: 1.25rem;
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  margin-bottom: var(--space-sm);
}

.service-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
  margin-bottom: var(--space-lg);
}

.service-card__link {
  font-size: 0.9375rem;
  font-weight: var(--font-weight-semi);
  color: var(--color-primary-mid);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition-fast);
}

.service-card__link:hover {
  border-bottom-color: var(--color-primary-mid);
}


/* ----------------------------------------------------------------
   8. TRUST
   ---------------------------------------------------------------- */
.trust {
  padding-block: var(--space-4xl);
  background-color: var(--color-bg-alt);
}

.trust-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-xl) var(--space-2xl);
}

.trust-item {
  padding-left: var(--space-lg);
  border-left: 3px solid var(--color-gold-400);
}

.trust-item__title {
  font-size: 1.125rem;
  font-weight: var(--font-weight-semi);
  color: var(--color-primary);
  margin-bottom: var(--space-xs);
}

.trust-item__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary);
  line-height: 1.65;
}


/* ----------------------------------------------------------------
   9. HERITAGE / ABOUT
   ---------------------------------------------------------------- */
.heritage {
  padding-block: var(--space-4xl);
  background-color: var(--color-bg);
}

.heritage-inner {
  max-width: 42rem;
}

.heritage .section-title {
  text-align: left;
  margin-bottom: var(--space-lg);
}

.heritage-body {
  margin-bottom: var(--space-xl);
}

.heritage-body p {
  font-size: 1.0625rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  margin-bottom: var(--space-md);
}

.heritage-body p:last-child {
  margin-bottom: 0;
}


/* ----------------------------------------------------------------
   10. CTA BAND
   ---------------------------------------------------------------- */
.cta-band {
  background: linear-gradient(
    168deg,
    var(--color-blue-800) 0%,
    var(--color-blue-700) 100%
  );
  color: var(--color-white);
  padding-block: var(--space-3xl);
}

.cta-band-inner {
  text-align: center;
}

.cta-band__title {
  font-size: clamp(1.5rem, 2.5vw + 0.25rem, 2rem);
  color: var(--color-white);
  margin-bottom: var(--space-sm);
}

.cta-band__text {
  font-size: 1.0625rem;
  color: var(--color-blue-200);
  margin-bottom: var(--space-xl);
}

.cta-band__actions {
  display: flex;
  justify-content: center;
  flex-wrap: wrap;
  gap: var(--space-md);
}


/* ----------------------------------------------------------------
   11. SITE FOOTER
   ---------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-blue-900);
  color: var(--color-blue-200);
  padding-top: var(--space-3xl);
}

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

/* --- Footer Brand --- */
.footer-wordmark {
  font-size: 1.25rem;
  font-weight: var(--font-weight-medium);
  color: var(--color-white);
}

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

.footer-established {
  font-size: 0.875rem;
  color: var(--color-blue-300);
  margin-top: var(--space-xs);
}

/* --- Footer Nav --- */
.footer-nav {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-xl);
}

.footer-nav-heading {
  font-size: 0.8125rem;
  font-weight: var(--font-weight-semi);
  color: var(--color-white);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-md);
}

.footer-nav-group ul li {
  margin-bottom: var(--space-sm);
}

.footer-nav-group ul li a {
  font-size: 0.9375rem;
  color: var(--color-blue-300);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer-nav-group ul li a:hover {
  color: var(--color-white);
}

/* --- Footer Bottom --- */
.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-block: var(--space-lg);
}

.footer-bottom p {
  font-size: 0.8125rem;
  color: var(--color-blue-400);
}


/* ----------------------------------------------------------------
   12. RESPONSIVE — Tablet (≤ 960px)
   ---------------------------------------------------------------- */
@media (max-width: 60rem) {

  .services-grid {
    grid-template-columns: 1fr;
    gap: var(--space-lg);
  }

  .trust-grid {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }

  .footer-inner {
    grid-template-columns: 1fr;
    gap: var(--space-xl);
  }
}


/* ----------------------------------------------------------------
   13. RESPONSIVE — Mobile (≤ 640px)
   ---------------------------------------------------------------- */
@media (max-width: 40rem) {

  .header-inner {
    height: 3.5rem;
  }

  .site-nav {
    display: none;
  }

  .nav-toggle {
    display: flex;
  }

  /* Mobile nav open state (toggled via JS) */
  .site-header.nav-open .site-nav {
    display: block;
    position: absolute;
    top: 3.5rem;
    left: 0;
    right: 0;
    background-color: var(--color-white);
    border-bottom: 1px solid var(--color-border);
    box-shadow: 0 8px 24px rgba(27, 58, 92, 0.1);
    padding: var(--space-md) var(--space-lg);
  }

  .site-header.nav-open .nav-list {
    flex-direction: column;
    align-items: stretch;
    gap: 0;
  }

  .site-header.nav-open .nav-link {
    display: block;
    padding: var(--space-sm) 0;
    border-radius: 0;
  }

  .site-header.nav-open .nav-link--cta {
    margin-left: 0;
    margin-top: var(--space-sm);
    text-align: center;
    border-radius: var(--radius-md);
    padding: var(--space-sm) var(--space-md);
  }

  .hero {
    padding-block: var(--space-3xl) var(--space-2xl);
  }

  .hero-heading {
    font-size: 1.75rem;
  }

  .hero-subheading {
    font-size: 1rem;
  }

  .hero-actions {
    flex-direction: column;
  }

  .hero-actions .btn {
    text-align: center;
  }

  .services,
  .trust,
  .heritage {
    padding-block: var(--space-2xl);
  }

  .footer-nav {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-lg);
  }

  .container {
    padding-inline: var(--space-md);
  }
}


/* ----------------------------------------------------------------
   14. REDUCED MOTION
   ---------------------------------------------------------------- */
@media (prefers-reduced-motion: reduce) {
  *,
  *::before,
  *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
    scroll-behavior: auto !important;
  }
}


/* ----------------------------------------------------------------
   15. PRINT
   ---------------------------------------------------------------- */
@media print {
  .site-header,
  .nav-toggle,
  .cta-band,
  .hero-actions {
    display: none;
  }

  .hero {
    background: none;
    color: var(--color-text);
    padding-block: var(--space-lg);
  }

  .hero-heading {
    color: var(--color-text);
  }

  .hero-subheading {
    color: var(--color-text-secondary);
  }

  body {
    font-size: 11pt;
  }

  .service-card {
    box-shadow: none;
    border: 1px solid #ccc;
    break-inside: avoid;
  }
}