/* ==========================================================================
   DSA ENGINEERING - MODERN PRODUCTION STYLESHEET
   Disciplines: Mechanical, Electrical, Plumbing (MEP) & Civil Engineering
   Offices: Wilmington, NC & Raleigh/Durham (Research Triangle), NC
   Design System: Fluid Mobile-First Typography, Glassmorphism & WCAG AA AA+
   ========================================================================== */

/* --------------------------------------------------------------------------
   1. CSS Custom Properties / Design Tokens
   -------------------------------------------------------------------------- */
:root {
  /* Brand Palette */
  --color-primary: #123C69;           /* Core Brand Navy */
  --color-primary-dark: #0A2240;      /* Midnight Navy */
  --color-primary-deep: #061528;      /* Deep Scrim Navy */
  --color-primary-light: #1A5491;     /* Interactive Navy */
  --color-primary-subtle: #EBF3FA;    /* Soft Navy Tint */
  
  --color-accent: #AC3B45;            /* Brand Crimson / Brick Red */
  --color-accent-hover: #8E2831;      /* Deep Crimson */
  --color-accent-light: #F9EBEB;      /* Warm Crimson Tint */
  
  --color-warm-cream: #FDF9EC;        /* Brand Cream Accent */
  --color-warm-stone: #E8E4DB;        /* Warm Neutral Stone */
  --color-sand: #D3CEB8;              /* Soft Ochre */
  
  /* Neutral Palette */
  --color-bg: #FFFFFF;
  --color-bg-alt: #F8FAFC;            /* Subtle Cool Light */
  --color-surface: #FFFFFF;
  --color-surface-hover: #F1F5F9;
  --color-border: #E2E8F0;
  --color-border-dark: #CBD5E1;
  
  /* Accessible Typography Palette (WCAG AA & AAA compliant on white) */
  --color-text-main: #0F172A;         /* High Contrast Slate (16.2:1) */
  --color-text-muted: #475569;        /* Medium Slate (6.1:1) */
  --color-text-light: #64748B;        /* Supporting Slate (4.6:1) */
  --color-text-inverse: #FFFFFF;
  --color-text-inverse-muted: #CBD5E1;

  /* Typography Stack */
  --font-sans: system-ui, -apple-system, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
  --font-heading: "Futura", system-ui, -apple-system, "Segoe UI", Roboto, sans-serif;

  /* Fluid Typography Scale (Mobile-First clamp values) */
  --text-xs: clamp(0.75rem, 0.7rem + 0.25vw, 0.8125rem);
  --text-sm: clamp(0.875rem, 0.825rem + 0.25vw, 0.9375rem);
  --text-base: clamp(1rem, 0.95rem + 0.25vw, 1.0625rem);
  --text-lg: clamp(1.125rem, 1.05rem + 0.35vw, 1.25rem);
  --text-xl: clamp(1.25rem, 1.15rem + 0.5vw, 1.4375rem);
  --text-2xl: clamp(1.5rem, 1.35rem + 0.75vw, 1.875rem);
  --text-3xl: clamp(1.875rem, 1.65rem + 1.1vw, 2.375rem);
  --text-4xl: clamp(2.25rem, 1.95rem + 1.5vw, 3rem);
  --text-5xl: clamp(2.75rem, 2.25rem + 2.5vw, 4rem);

  /* Spacing Scale */
  --space-2xs: 0.25rem;
  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2rem;
  --space-2xl: 3rem;
  --space-3xl: 4.5rem;
  --space-4xl: 6rem;

  /* Layout Widths */
  --container-max: 1240px;
  --container-wide: 1360px;
  --container-narrow: 840px;
  --header-height: 84px;

  /* Elevation & Shadows */
  --shadow-xs: 0 1px 2px rgba(15, 23, 42, 0.05);
  --shadow-sm: 0 2px 4px rgba(15, 23, 42, 0.06), 0 1px 2px rgba(15, 23, 42, 0.04);
  --shadow-md: 0 4px 12px rgba(15, 23, 42, 0.08), 0 2px 4px rgba(15, 23, 42, 0.04);
  --shadow-lg: 0 12px 24px -4px rgba(15, 23, 42, 0.1), 0 4px 8px -2px rgba(15, 23, 42, 0.05);
  --shadow-xl: 0 20px 35px -6px rgba(15, 23, 42, 0.15), 0 10px 15px -4px rgba(15, 23, 42, 0.08);

  /* Transitions */
  --transition-fast: 150ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-normal: 250ms cubic-bezier(0.4, 0, 0.2, 1);
  --transition-slow: 350ms cubic-bezier(0.4, 0, 0.2, 1);

  /* Borders & Radius */
  --radius-sm: 6px;
  --radius-md: 10px;
  --radius-lg: 16px;
  --radius-xl: 24px;
  --radius-full: 9999px;
}

/* --------------------------------------------------------------------------
   2. Modern Reset & Base Rules
   -------------------------------------------------------------------------- */
*,
*::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: var(--text-base);
  line-height: 1.65;
  color: var(--color-text-main);
  background-color: var(--color-bg);
  min-height: 100vh;
  display: flex;
  flex-direction: column;
  overflow-x: clip; /* Cleanly clip without disabling sticky headers */
}

/* Ensure flex/grid children can shrink properly without overflowing */
*,
::before,
::after {
  min-width: 0;
}

img,
picture,
video,
canvas,
svg {
  display: block;
  max-width: 100%;
  height: auto;
}

input,
button,
textarea,
select {
  font: inherit;
  color: inherit;
}

p,
h1,
h2,
h3,
h4,
h5,
h6 {
  overflow-wrap: break-word;
}

ul[role="list"],
ol[role="list"] {
  list-style: none;
}

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

a:hover {
  color: var(--color-accent);
}

/* Accessible Skip Link */
.skip-link {
  position: absolute;
  top: -100px;
  inset-inline-start: var(--space-md);
  background-color: var(--color-accent);
  color: #FFFFFF;
  padding: var(--space-sm) var(--space-md);
  font-weight: 700;
  border-radius: var(--radius-sm);
  z-index: 9999;
  transition: top var(--transition-fast);
  text-decoration: none;
}

.skip-link:focus {
  top: var(--space-md);
  outline: 3px solid #FFFFFF;
  outline-offset: 3px;
}

/* Focus Visible Accessibility */
:focus-visible {
  outline: 3px solid var(--color-accent);
  outline-offset: 3px;
}

/* --------------------------------------------------------------------------
   3. Typography & Utility Classes
   -------------------------------------------------------------------------- */
h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-heading);
  font-weight: 700;
  line-height: 1.25;
  color: var(--color-primary-dark);
  letter-spacing: -0.015em;
}

h1 { font-size: var(--text-5xl); }
h2 { font-size: var(--text-3xl); }
h3 { font-size: var(--text-2xl); }
h4 { font-size: var(--text-xl); }

.lead-text {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text-muted);
}

.eyebrow {
  display: inline-flex;
  align-items: center;
  gap: var(--space-xs);
  font-size: var(--text-xs);
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--color-accent);
  margin-bottom: var(--space-sm);
}

.eyebrow::before {
  content: "";
  display: inline-block;
  width: 24px;
  height: 2px;
  background-color: var(--color-accent);
}

.eyebrow--light {
  color: var(--color-sand);
}

.eyebrow--light::before {
  background-color: var(--color-sand);
}

.section-intro {
  max-width: var(--container-narrow);
  margin-inline: auto;
  text-align: center;
  margin-bottom: var(--space-3xl);
}

.section-intro .eyebrow {
  justify-content: center;
}

.section-intro h2 {
  margin-bottom: var(--space-md);
}

.container {
  width: 100%;
  max-width: var(--container-max);
  margin-inline: auto;
  padding-inline: var(--space-md);
}

@media (min-width: 768px) {
  .container {
    padding-inline: var(--space-xl);
  }
}

.container-wide {
  max-width: var(--container-wide);
}

.container-narrow {
  max-width: var(--container-narrow);
}

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

@media (min-width: 1024px) {
  .section {
    padding-block: var(--space-4xl);
  }
}

.section--alt {
  background-color: var(--color-bg-alt);
}

.section--dark {
  background-color: var(--color-primary-dark);
  color: var(--color-text-inverse);
}

.section--dark h2,
.section--dark h3,
.section--dark h4 {
  color: var(--color-text-inverse);
}

.section--dark .lead-text {
  color: var(--color-text-inverse-muted);
}

/* --------------------------------------------------------------------------
   4. Buttons & Interactive Links
   -------------------------------------------------------------------------- */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-xs);
  min-height: 48px;
  padding: 0.75rem 1.75rem;
  border-radius: var(--radius-sm);
  font-weight: 700;
  font-size: var(--text-sm);
  letter-spacing: 0.02em;
  text-align: center;
  cursor: pointer;
  border: 2px solid transparent;
  transition: all var(--transition-fast);
  text-decoration: none;
  white-space: nowrap;
}

.btn-primary {
  background-color: var(--color-accent);
  color: #FFFFFF;
}

.btn-primary:hover {
  background-color: var(--color-accent-hover);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(172, 59, 69, 0.35);
  transform: translateY(-2px);
}

.btn-secondary {
  background-color: var(--color-primary);
  color: #FFFFFF;
}

.btn-secondary:hover {
  background-color: var(--color-primary-light);
  color: #FFFFFF;
  box-shadow: 0 4px 14px rgba(18, 60, 105, 0.35);
  transform: translateY(-2px);
}

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

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

.btn-outline-white {
  background-color: transparent;
  border-color: #FFFFFF;
  color: #FFFFFF;
}

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

.btn-group {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  align-items: center;
}

/* --------------------------------------------------------------------------
   5. Sticky Glassmorphism Header & Navigation
   -------------------------------------------------------------------------- */
.site-header {
  position: sticky;
  top: 0;
  z-index: 1000;
  width: 100%;
  background-color: rgba(255, 255, 255, 0.94);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid rgba(18, 60, 105, 0.08);
  box-shadow: var(--shadow-xs);
  transition: box-shadow var(--transition-normal), background-color var(--transition-normal);
}

.site-header.scrolled {
  background-color: rgba(255, 255, 255, 0.98);
  box-shadow: var(--shadow-sm);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--header-height);
  gap: var(--space-lg);
}

/* Logo sits at start and acts as home link */
.brand-link {
  display: flex;
  align-items: center;
  flex-shrink: 0;
  padding-block: var(--space-xs);
  min-height: 48px;
}

.brand-logo-img {
  height: 52px;
  width: auto;
  aspect-ratio: 1292 / 866;
  object-fit: contain;
}

/* Primary Navigation Desktop */
.primary-nav {
  display: flex;
  align-items: center;
  gap: var(--space-xl);
}

.nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  gap: var(--space-sm);
}

.nav-link {
  position: relative;
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0.5rem 0.85rem;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-main);
  border-radius: var(--radius-sm);
  transition: color var(--transition-fast), background-color var(--transition-fast);
}

.nav-link:hover {
  color: var(--color-accent);
  background-color: rgba(18, 60, 105, 0.04);
}

.nav-link.active {
  color: var(--color-primary);
  font-weight: 700;
}

.nav-link.active::after {
  content: "";
  position: absolute;
  bottom: 6px;
  left: 0.85rem;
  right: 0.85rem;
  height: 2px;
  background-color: var(--color-accent);
  border-radius: 2px;
}

.header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-md);
}

.header-cta {
  display: none;
}

@media (min-width: 768px) {
  .header-cta {
    display: inline-flex;
  }
}

/* Mobile Navigation Toggle (Hamburger) */
.mobile-toggle {
  display: none;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  gap: 5px;
  width: 48px;
  height: 48px;
  background: transparent;
  border: none;
  cursor: pointer;
  border-radius: var(--radius-sm);
  padding: 10px;
  color: var(--color-primary-dark);
}

.mobile-toggle-bar {
  display: block;
  width: 24px;
  height: 2px;
  background-color: currentColor;
  border-radius: 2px;
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

/* Responsive Menu Drawer */
@media (max-width: 991px) {
  .mobile-toggle {
    display: flex;
  }

  .primary-nav {
    position: fixed;
    top: var(--header-height);
    inset-inline-start: 0;
    width: 100%;
    height: calc(100vh - var(--header-height));
    background-color: #FFFFFF;
    flex-direction: column;
    align-items: flex-start;
    padding: var(--space-xl);
    gap: var(--space-lg);
    box-shadow: var(--shadow-lg);
    transform: translateY(-100%);
    opacity: 0;
    pointer-events: none;
    transition: transform var(--transition-normal), opacity var(--transition-normal);
    overflow-y: auto;
  }

  .primary-nav.is-open {
    transform: translateY(0);
    opacity: 1;
    pointer-events: auto;
  }

  .nav-list {
    flex-direction: column;
    align-items: flex-start;
    width: 100%;
    gap: var(--space-xs);
  }

  .nav-link {
    width: 100%;
    padding: 0.85rem 1rem;
    font-size: var(--text-lg);
  }

  .nav-link.active::after {
    left: 1rem;
    right: auto;
    width: 32px;
    bottom: 4px;
  }

  .mobile-drawer-cta {
    width: 100%;
    margin-top: var(--space-md);
  }

  /* Hamburger transform when open */
  .mobile-toggle[aria-expanded="true"] .mobile-toggle-bar:nth-child(1) {
    transform: translateY(7px) rotate(45deg);
  }
  .mobile-toggle[aria-expanded="true"] .mobile-toggle-bar:nth-child(2) {
    opacity: 0;
  }
  .mobile-toggle[aria-expanded="true"] .mobile-toggle-bar:nth-child(3) {
    transform: translateY(-7px) rotate(-45deg);
  }
}

/* --------------------------------------------------------------------------
   6. Hero Section (Accessible High-Contrast Architectural Banner)
   -------------------------------------------------------------------------- */
.hero {
  position: relative;
  background-color: var(--color-primary-dark);
  color: var(--color-text-inverse);
  padding-block: var(--space-3xl) var(--space-4xl);
  overflow: hidden;
}

@media (min-width: 1024px) {
  .hero {
    padding-block: var(--space-4xl) var(--space-4xl);
  }
}

.hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.22;
  filter: contrast(1.1) brightness(0.9);
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 34, 64, 0.95) 0%,
    rgba(18, 60, 105, 0.92) 50%,
    rgba(6, 21, 40, 0.97) 100%
  );
}

.hero-content {
  position: relative;
  z-index: 10;
  max-width: 820px;
}

.hero h1 {
  color: #FFFFFF;
  margin-bottom: var(--space-md);
  line-height: 1.15;
}

.hero h1 span.accent {
  color: var(--color-sand);
}

.hero-lead {
  font-size: var(--text-lg);
  line-height: 1.7;
  color: var(--color-text-inverse-muted);
  margin-bottom: var(--space-xl);
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: var(--space-md);
  margin-top: var(--space-2xl);
  padding-top: var(--space-xl);
  border-top: 1px solid rgba(255, 255, 255, 0.15);
}

@media (min-width: 768px) {
  .hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

.stat-item {
  display: flex;
  flex-direction: column;
}

.stat-number {
  font-size: var(--text-3xl);
  font-weight: 800;
  color: var(--color-warm-cream);
  line-height: 1.1;
  font-family: var(--font-heading);
}

.stat-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-inverse-muted);
  margin-top: var(--space-2xs);
}

/* --------------------------------------------------------------------------
   7. AEO Definition Box (What is MEP Engineering)
   -------------------------------------------------------------------------- */
.aeo-callout {
  background-color: #FFFFFF;
  border-radius: var(--radius-lg);
  border-inline-start: 6px solid var(--color-accent);
  padding: var(--space-xl);
  box-shadow: var(--shadow-md);
  margin-block: calc(-1 * var(--space-2xl)) var(--space-2xl);
  position: relative;
  z-index: 20;
}

@media (min-width: 768px) {
  .aeo-callout {
    padding: var(--space-2xl);
  }
}

.aeo-header {
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  margin-bottom: var(--space-sm);
}

.aeo-badge {
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.25rem 0.75rem;
  border-radius: var(--radius-full);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.aeo-callout h3 {
  font-size: var(--text-xl);
  color: var(--color-primary-dark);
}

.aeo-callout p {
  color: var(--color-text-muted);
  font-size: var(--text-base);
  line-height: 1.7;
}

/* --------------------------------------------------------------------------
   8. Core Services Cards (4 Pillars)
   -------------------------------------------------------------------------- */
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 640px) {
  .services-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .services-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.service-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal), border-color var(--transition-normal);
  position: relative;
}

.service-card:hover {
  transform: translateY(-6px);
  box-shadow: var(--shadow-lg);
  border-color: rgba(18, 60, 105, 0.2);
}

.service-card-icon {
  width: 52px;
  height: 52px;
  border-radius: var(--radius-md);
  background-color: var(--color-primary-subtle);
  color: var(--color-primary);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--space-lg);
  flex-shrink: 0;
}

.service-card-icon svg {
  width: 28px;
  height: 28px;
}

.service-card h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-sm);
  color: var(--color-primary-dark);
}

.service-card p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.65;
  margin-top: auto;
}

/* --------------------------------------------------------------------------
   9. Target Markets Grid (8 Real Scraped Photo Sectors)
   -------------------------------------------------------------------------- */
.markets-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg);
}

@media (min-width: 600px) {
  .markets-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .markets-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

.market-card {
  position: relative;
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  border: 1px solid var(--color-border);
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-normal), box-shadow var(--transition-normal);
}

.market-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--shadow-lg);
}

.market-media {
  position: relative;
  aspect-ratio: 16 / 10;
  width: 100%;
  overflow: hidden;
  background-color: var(--color-primary-dark);
}

.market-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform var(--transition-slow);
}

.market-card:hover .market-media img {
  transform: scale(1.06);
}

.market-badge {
  position: absolute;
  top: var(--space-sm);
  inset-inline-start: var(--space-sm);
  background-color: rgba(10, 34, 64, 0.85);
  color: #FFFFFF;
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-sm);
  backdrop-filter: blur(4px);
  letter-spacing: 0.04em;
  text-transform: uppercase;
}

.market-content {
  padding: var(--space-lg);
  display: flex;
  flex-direction: column;
  flex-grow: 1;
}

.market-content h3 {
  font-size: var(--text-lg);
  margin-bottom: var(--space-xs);
  color: var(--color-primary-dark);
}

.market-content p {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.6;
  margin-bottom: var(--space-md);
}

.market-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin-top: auto;
}

.market-tag {
  font-size: 0.72rem;
  background-color: var(--color-bg-alt);
  color: var(--color-primary);
  border: 1px solid var(--color-border);
  padding: 0.2rem 0.5rem;
  border-radius: var(--radius-sm);
  font-weight: 600;
}

/* --------------------------------------------------------------------------
   10. Feature / Highlight Split Sections
   -------------------------------------------------------------------------- */
.split-feature {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  align-items: center;
}

@media (min-width: 992px) {
  .split-feature {
    grid-template-columns: 1fr 1fr;
  }
}

.split-feature-content h2 {
  margin-bottom: var(--space-md);
}

.split-feature-content p {
  margin-bottom: var(--space-lg);
  color: var(--color-text-muted);
}

.feature-checklist {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  margin-bottom: var(--space-xl);
}

.checklist-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-sm);
  font-size: var(--text-sm);
  color: var(--color-text-main);
}

.checklist-icon {
  width: 20px;
  height: 20px;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 2px;
}

.feature-card-box {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-2xl);
  box-shadow: var(--shadow-lg);
  position: relative;
}

.feature-card-box::before {
  content: "";
  position: absolute;
  top: 0;
  inset-inline: var(--space-2xl);
  height: 4px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
}

/* --------------------------------------------------------------------------
   11. Call-to-Action (CTA) Banner
   -------------------------------------------------------------------------- */
.cta-banner {
  position: relative;
  background-color: var(--color-primary-dark);
  color: var(--color-text-inverse);
  border-radius: var(--radius-xl);
  overflow: hidden;
  padding: var(--space-3xl) var(--space-xl);
  text-align: center;
  box-shadow: var(--shadow-xl);
}

@media (min-width: 768px) {
  .cta-banner {
    padding: var(--space-4xl) var(--space-3xl);
  }
}

.cta-banner-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
}

.cta-banner-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(
    135deg,
    rgba(10, 34, 64, 0.94) 0%,
    rgba(18, 60, 105, 0.90) 100%
  );
}

.cta-banner-content {
  position: relative;
  z-index: 10;
  max-width: 680px;
  margin-inline: auto;
}

.cta-banner h2 {
  color: #FFFFFF;
  margin-bottom: var(--space-md);
}

.cta-banner p {
  color: var(--color-text-inverse-muted);
  font-size: var(--text-lg);
  margin-bottom: var(--space-xl);
}

.cta-banner .btn-group {
  justify-content: center;
}

/* --------------------------------------------------------------------------
   12. Detailed Market Filter (Markets Page)
   -------------------------------------------------------------------------- */
.filter-tabs {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-xs);
  justify-content: center;
  margin-bottom: var(--space-2xl);
}

.filter-btn {
  background-color: #FFFFFF;
  border: 1px solid var(--color-border);
  color: var(--color-text-main);
  padding: 0.6rem 1.25rem;
  border-radius: var(--radius-full);
  font-size: var(--text-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all var(--transition-fast);
}

.filter-btn:hover {
  border-color: var(--color-primary);
  color: var(--color-primary);
}

.filter-btn.active {
  background-color: var(--color-primary);
  border-color: var(--color-primary);
  color: #FFFFFF;
}

.detailed-market-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  display: grid;
  grid-template-columns: 1fr;
  margin-bottom: var(--space-2xl);
  transition: box-shadow var(--transition-normal);
}

@media (min-width: 860px) {
  .detailed-market-card {
    grid-template-columns: 420px 1fr;
  }
}

.detailed-market-card:hover {
  box-shadow: var(--shadow-lg);
}

.detailed-market-media {
  position: relative;
  min-height: 260px;
  background-color: var(--color-primary-dark);
}

.detailed-market-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.detailed-market-body {
  padding: var(--space-xl);
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.detailed-market-body h3 {
  font-size: var(--text-2xl);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-xs);
}

.detailed-market-body p {
  color: var(--color-text-muted);
  margin-bottom: var(--space-md);
  line-height: 1.7;
}

.market-spec-box {
  background-color: var(--color-bg-alt);
  border-radius: var(--radius-md);
  padding: var(--space-md);
  margin-top: var(--space-sm);
}

.market-spec-title {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 800;
  color: var(--color-primary);
  margin-bottom: var(--space-2xs);
}

.market-spec-list {
  font-size: var(--text-sm);
  color: var(--color-text-main);
  line-height: 1.6;
}

/* --------------------------------------------------------------------------
   13. Careers & Hiring System (Careers Page)
   -------------------------------------------------------------------------- */
.careers-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-xl);
}

@media (min-width: 768px) {
  .careers-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

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

.career-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-md);
}

.career-card-header {
  display: flex;
  justify-content: space-between;
  align-items: flex-start;
  margin-bottom: var(--space-sm);
}

.career-badge {
  background-color: var(--color-accent-light);
  color: var(--color-accent);
  font-size: var(--text-xs);
  font-weight: 700;
  padding: 0.25rem 0.65rem;
  border-radius: var(--radius-full);
}

.career-card h3 {
  font-size: var(--text-xl);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-xs);
}

.career-location {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  display: flex;
  align-items: center;
  gap: 0.35rem;
  margin-bottom: var(--space-md);
}

.career-card p {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.65;
  margin-bottom: var(--space-lg);
  flex-grow: 1;
}

.application-protocol-box {
  background-color: var(--color-warm-cream);
  border: 2px solid var(--color-sand);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  margin-top: var(--space-3xl);
}

.application-protocol-box h3 {
  color: var(--color-primary-dark);
  margin-bottom: var(--space-sm);
}

.application-protocol-box ol {
  padding-inline-start: var(--space-xl);
  margin-block: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
  color: var(--color-text-main);
}

/* --------------------------------------------------------------------------
   14. Contact Page & Interactive Form
   -------------------------------------------------------------------------- */
.contact-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3xl);
}

@media (min-width: 992px) {
  .contact-layout {
    grid-template-columns: 1fr 1.2fr;
  }
}

.offices-cards {
  display: flex;
  flex-direction: column;
  gap: var(--space-xl);
}

.office-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-xl);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.office-card::before {
  content: "";
  position: absolute;
  top: 0;
  inset-inline-start: 0;
  width: 5px;
  height: 100%;
  background-color: var(--color-primary);
}

.office-card--accent::before {
  background-color: var(--color-accent);
}

.office-card h3 {
  font-size: var(--text-xl);
  color: var(--color-primary-dark);
  margin-bottom: var(--space-md);
}

.office-detail-row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-md);
  margin-bottom: var(--space-md);
}

.office-icon {
  width: 22px;
  height: 22px;
  color: var(--color-accent);
  flex-shrink: 0;
  margin-top: 3px;
}

.office-text-label {
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 700;
  color: var(--color-text-light);
  display: block;
}

.office-text-val {
  font-size: var(--text-base);
  color: var(--color-text-main);
  font-weight: 500;
}

.office-text-val a {
  color: var(--color-primary);
  font-weight: 600;
}

.office-text-val a:hover {
  color: var(--color-accent);
  text-decoration: underline;
}

/* Contact Form Card */
.contact-form-card {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  padding: var(--space-xl);
  box-shadow: var(--shadow-lg);
}

@media (min-width: 768px) {
  .contact-form-card {
    padding: var(--space-2xl);
  }
}

.contact-form-card h2 {
  font-size: var(--text-2xl);
  margin-bottom: var(--space-xs);
}

.contact-form-card .form-subtitle {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  margin-bottom: var(--space-xl);
}

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

@media (min-width: 640px) {
  .form-grid-2col {
    grid-template-columns: repeat(2, 1fr);
  }
}

.form-group {
  display: flex;
  flex-direction: column;
  gap: var(--space-2xs);
}

.form-group label {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-main);
}

.form-group label .required-star {
  color: var(--color-accent);
}

.form-control {
  min-height: 48px;
  padding: 0.75rem 1rem;
  border: 1.5px solid var(--color-border);
  border-radius: var(--radius-sm);
  background-color: #FFFFFF;
  color: var(--color-text-main);
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.form-control:focus {
  border-color: var(--color-accent);
  outline: none;
  box-shadow: 0 0 0 3px rgba(172, 59, 69, 0.15);
}

textarea.form-control {
  min-height: 130px;
  resize: vertical;
}

.captcha-box {
  background-color: var(--color-bg-alt);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: var(--space-md);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.captcha-prompt {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.captcha-math {
  font-family: var(--font-heading);
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-primary-dark);
}

.captcha-refresh-btn {
  background: transparent;
  border: none;
  color: var(--color-primary);
  font-size: var(--text-xs);
  cursor: pointer;
  text-decoration: underline;
  padding: 4px;
}

.form-status {
  padding: var(--space-md);
  border-radius: var(--radius-sm);
  font-size: var(--text-sm);
  font-weight: 600;
  display: none;
}

.form-status.is-success {
  display: block;
  background-color: #ECFDF5;
  color: #065F46;
  border: 1px solid #A7F3D0;
}

.form-status.is-error {
  display: block;
  background-color: #FEF2F2;
  color: #991B1B;
  border: 1px solid #FECACA;
}

/* --------------------------------------------------------------------------
   15. FAQ Accordion (AEO Support)
   -------------------------------------------------------------------------- */
.faq-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
  max-width: var(--container-narrow);
  margin-inline: auto;
}

.faq-item {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
  transition: border-color var(--transition-fast);
}

.faq-item:hover {
  border-color: var(--color-primary);
}

.faq-button {
  width: 100%;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-lg);
  background: transparent;
  border: none;
  text-align: start;
  font-size: var(--text-base);
  font-weight: 700;
  color: var(--color-primary-dark);
  cursor: pointer;
  min-height: 48px;
}

.faq-icon {
  width: 20px;
  height: 20px;
  transition: transform var(--transition-fast);
  color: var(--color-accent);
  flex-shrink: 0;
}

.faq-button[aria-expanded="true"] .faq-icon {
  transform: rotate(180deg);
}

.faq-answer {
  display: none;
  padding: 0 var(--space-lg) var(--space-lg);
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.7;
}

.faq-item.is-open .faq-answer {
  display: block;
}

/* --------------------------------------------------------------------------
   16. Multi-Column Accessible Footer
   -------------------------------------------------------------------------- */
.site-footer {
  background-color: var(--color-primary-dark);
  color: var(--color-text-inverse-muted);
  margin-top: auto;
  padding-top: var(--space-4xl);
  border-top: 4px solid var(--color-accent);
}

.footer-top {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-2xl);
  padding-bottom: var(--space-3xl);
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

@media (min-width: 640px) {
  .footer-top {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .footer-top {
    grid-template-columns: 1.5fr 1fr 1fr 1fr;
  }
}

.footer-brand {
  display: flex;
  flex-direction: column;
  gap: var(--space-md);
}

.footer-logo-img {
  height: 46px;
  width: auto;
  aspect-ratio: 1308 / 876;
  object-fit: contain;
}

.footer-brand p {
  font-size: var(--text-sm);
  line-height: 1.65;
  color: var(--color-text-inverse-muted);
}

.footer-col h3 {
  color: #FFFFFF;
  font-size: var(--text-base);
  margin-bottom: var(--space-lg);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  font-weight: 700;
  position: relative;
  padding-bottom: var(--space-xs);
}

.footer-col h3::after {
  content: "";
  position: absolute;
  bottom: 0;
  inset-inline-start: 0;
  width: 28px;
  height: 2px;
  background-color: var(--color-accent);
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-links a {
  color: var(--color-text-inverse-muted);
  font-size: var(--text-sm);
  display: inline-flex;
  align-items: center;
  min-height: 38px;
  transition: color var(--transition-fast), padding-inline-start var(--transition-fast);
}

.footer-links a:hover {
  color: #FFFFFF;
  padding-inline-start: 4px;
}

.footer-address {
  font-style: normal;
  font-size: var(--text-sm);
  line-height: 1.6;
  color: var(--color-text-inverse-muted);
  display: flex;
  flex-direction: column;
  gap: var(--space-xs);
}

.footer-address a {
  color: var(--color-warm-cream);
}

.footer-address a:hover {
  color: #FFFFFF;
  text-decoration: underline;
}

.footer-bottom {
  padding-block: var(--space-lg);
  display: flex;
  flex-direction: column;
  gap: var(--space-sm);
  align-items: center;
  justify-content: space-between;
  font-size: var(--text-xs);
  color: rgba(255, 255, 255, 0.6);
  text-align: center;
}

@media (min-width: 768px) {
  .footer-bottom {
    flex-direction: row;
    text-align: start;
  }
}

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

.footer-bottom a:hover {
  color: #FFFFFF;
}

/* --------------------------------------------------------------------------
   17. Back-to-Top Button
   -------------------------------------------------------------------------- */
.back-to-top {
  position: fixed;
  bottom: 2rem;
  inset-inline-end: 2rem;
  width: 50px;
  height: 50px;
  min-width: 48px;
  min-height: 48px;
  border-radius: var(--radius-full);
  background-color: var(--color-accent);
  color: #FFFFFF;
  border: none;
  cursor: pointer;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.25);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 990;
  opacity: 0;
  visibility: hidden;
  transform: translateY(12px);
  transition: opacity var(--transition-normal), visibility var(--transition-normal), transform var(--transition-normal), background-color var(--transition-fast);
}

.back-to-top.is-visible {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.back-to-top:hover {
  background-color: var(--color-accent-hover);
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(172, 59, 69, 0.4);
}

.back-to-top svg {
  width: 24px;
  height: 24px;
  transition: transform var(--transition-fast);
}

.back-to-top:hover svg {
  transform: translateY(-2px);
}

/* --------------------------------------------------------------------------
   18. Print & High Contrast Optimization
   -------------------------------------------------------------------------- */
@media print {
  .site-header,
  .mobile-toggle,
  .back-to-top,
  .cta-banner,
  .btn {
    display: none !important;
  }

  body {
    background-color: #FFFFFF;
    color: #000000;
  }

  a[href^="http"]::after {
    content: " (" attr(href) ")";
    font-size: 80%;
  }
}