/* ============================================================================
   TECOSTAR HOLDINGS, INC. - PROFESSIONAL ENTERPRISE WEBSITE
   CSS Variable System & Responsive Grid Layout
   ============================================================================ */

/* ============================================================================
   CSS VARIABLES - DESIGN TOKENS
   ============================================================================ */

:root {
  /* ==========================================================================
     TECOSTAR HOLDINGS, INC. — REFACTOR THEME TOKENS
     Strategy: "Dual-Track Precision" (Medical + Aerospace)
     Constraints: no gradients / US B2B / HTML+CSS+Vanilla JS / WCAG AA
     ========================================================================== */

  /* Brand Colors (from plan) */
  --primary: #0A2540;         /* Space Deep Blue */
  --primary-light: #1E3A5F;
  --primary-dark: #061A2E;
  --medical-teal: #0891B2;    /* Medical Tech Teal */
  --precision-silver: #94A3B8;

  /* Surfaces & Text */
  --surface: #F8FAFC;
  --white: #FFFFFF;
  --text: #0F172A;
  --text-muted: #475569;
  --border: #E2E8F0;
  --border-dark: #CBD5E1;

  /* Functional (kept restrained) */
  --success: #16A34A;
  --warning: #D97706;
  --danger: #DC2626;
  
  /* Typography */
  --font-primary: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
  --font-secondary: ui-serif, Georgia, "Times New Roman", Times, serif;
  --font-mono: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", "Courier New", monospace;
  
  --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: 1.5rem;             /* 24px */
  --font-size-2xl: 2rem;              /* 32px */
  --font-size-3xl: 2.5rem;            /* 40px */
  --font-size-4xl: 3rem;              /* 48px */
  
  --font-weight-regular: 400;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  --font-weight-heavy: 800;
  
  /* Spacing System (plan) */
  --space-xs: 0.25rem;   /* 4px */
  --space-sm: 0.5rem;    /* 8px */
  --space-md: 1rem;      /* 16px */
  --space-lg: 1.5rem;    /* 24px */
  --space-xl: 2rem;      /* 32px */
  --space-2xl: 3rem;     /* 48px */
  --space-3xl: 4rem;     /* 64px */

  /* Backwards-compatible spacing aliases */
  --spacing-xs: var(--space-xs);
  --spacing-sm: var(--space-sm);
  --spacing-md: var(--space-md);
  --spacing-lg: var(--space-lg);
  --spacing-xl: var(--space-xl);
  --spacing-2xl: var(--space-2xl);
  --spacing-3xl: var(--space-3xl);
  --spacing-4xl: 5rem;   /* 80px (legacy) */
  
  /* Border Radius */
  --radius-none: 0;
  --radius-sm: 4px;
  --radius-md: 6px;
  --radius-lg: 8px;
  --radius-xl: 12px;
  --radius-2xl: 16px;
  --radius-full: 9999px;
  
  /* Shadows (restrained) */
  --shadow-sm: 0 1px 2px rgba(2, 6, 23, 0.06);
  --shadow-md: 0 4px 10px rgba(2, 6, 23, 0.08);
  --shadow-lg: 0 14px 25px rgba(2, 6, 23, 0.12);
  --shadow-xl: 0 22px 45px rgba(2, 6, 23, 0.14);
  --shadow-2xl: 0 30px 65px rgba(2, 6, 23, 0.16);
  
  /* Transitions */
  --transition-fast: 150ms ease;
  --transition-base: 200ms ease;
  --transition-slow: 500ms ease;

  /* Container Widths (plan) */
  --container-sm: 640px;
  --container-md: 768px;
  --container-lg: 1024px;
  --container-xl: 1280px;
  
  /* Z-index Scale */
  --z-dropdown: 100;
  --z-sticky: 200;
  --z-fixed: 300;
  --z-modal: 400;
  --z-tooltip: 500;

  /* Backwards-compatible color aliases */
  --color-primary: var(--primary);
  --color-primary-dark: var(--primary-dark);
  --color-primary-light: var(--primary-light);
  --color-secondary: var(--text);
  --color-accent: var(--medical-teal);
  --color-success: var(--success);
  --color-warning: var(--warning);
  --color-danger: var(--danger);
  --color-white: var(--white);
  --color-light-gray: var(--surface);
  --color-gray: var(--border);
  --color-dark-gray: var(--text-muted);
  --color-text: var(--text);
  --color-text-light: var(--text-muted);
  --color-border: var(--border);
}

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

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
  font-size: 16px;
}

body {
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  line-height: 1.6;
  color: var(--color-text);
  background-color: var(--white);
  overflow-x: hidden;
}

/* Focus styles (WCAG 2.1 AA) */
:focus-visible {
  outline: 3px solid rgba(8, 145, 178, 0.55);
  outline-offset: 3px;
}

/* Skip link (WCAG 2.1 AA) */
.skip-link {
  position: absolute;
  top: var(--space-md);
  left: var(--space-md);
  padding: var(--space-sm) var(--space-md);
  background: var(--white);
  color: var(--text);
  border: 1px solid var(--border-dark);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  transform: translateY(-200%);
  transition: transform var(--transition-fast);
  z-index: var(--z-tooltip);
}

.skip-link:focus {
  transform: translateY(0);
}

/* Visually hidden utility */
.sr-only {
  position: absolute !important;
  width: 1px !important;
  height: 1px !important;
  padding: 0 !important;
  margin: -1px !important;
  overflow: hidden !important;
  clip: rect(0, 0, 0, 0) !important;
  white-space: nowrap !important;
  border: 0 !important;
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  *, *::before, *::after {
    animation-duration: 0.001ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.001ms !important;
    scroll-behavior: auto !important;
  }
}

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

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

h1 {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-heavy);
}

h2 {
  font-size: var(--font-size-3xl);
}

h3 {
  font-size: var(--font-size-2xl);
}

h4 {
  font-size: var(--font-size-xl);
}

h5 {
  font-size: var(--font-size-lg);
}

h6 {
  font-size: var(--font-size-base);
}

p {
  margin-bottom: var(--spacing-md);
  color: var(--color-text-light);
  line-height: 1.8;
}

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

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

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

em {
  font-style: italic;
}

/* ============================================================================
   RESPONSIVE GRID LAYOUT SYSTEM
   ============================================================================ */

.container {
  width: 100%;
  max-width: var(--container-xl);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-lg);
  }
}

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

/* Grid System */
.grid {
  display: grid;
  gap: var(--spacing-lg);
}

.grid-2 {
  grid-template-columns: 1fr;
}

.grid-3 {
  grid-template-columns: 1fr;
}

.grid-4 {
  grid-template-columns: 1fr;
}

@media (min-width: 768px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-3 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-4 {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  
  .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  
  .grid-4 {
    grid-template-columns: repeat(4, 1fr);
  }
}

/* Flex Layout */
.flex {
  display: flex;
}

.flex-col {
  flex-direction: column;
}

.flex-row {
  flex-direction: row;
}

.flex-wrap {
  flex-wrap: wrap;
}

.flex-center {
  align-items: center;
  justify-content: center;
}

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

.flex-start {
  align-items: flex-start;
  justify-content: flex-start;
}

.flex-end {
  align-items: flex-end;
  justify-content: flex-end;
}

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

.gap-md {
  gap: var(--spacing-md);
}

.gap-lg {
  gap: var(--spacing-lg);
}

.gap-xl {
  gap: var(--spacing-xl);
}

/* ============================================================================
   NAVIGATION STYLES
   ============================================================================ */

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

.main-nav {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-md) 0;
  gap: var(--space-md);
}

.brand,
.logo {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-heavy);
  color: var(--primary);
  display: flex;
  align-items: center;
  gap: var(--space-sm);
  letter-spacing: 0.01em;
}

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

.brand img,
.logo img {
  height: 40px;
  width: auto;
}

.nav-panel {
  display: flex;
  align-items: center;
  gap: var(--space-lg);
}

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

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

.nav-item {
  position: relative;
}

.nav-link {
  color: var(--text);
  font-weight: var(--font-weight-semibold);
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  transition: color var(--transition-fast);
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  background: transparent;
  border: none;
  cursor: pointer;
}

.nav-link:hover {
  color: var(--primary);
  text-decoration: none;
  background: rgba(148, 163, 184, 0.16);
}

/* Dropdown Menu */
.dropdown {
  position: relative;
}

.dropdown-menu {
  position: absolute;
  top: calc(100% + var(--space-sm));
  left: 0;
  background-color: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  min-width: 240px;
  padding: var(--space-sm);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-6px);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility 0s linear var(--transition-fast);
  z-index: var(--z-dropdown);
  pointer-events: none;
}

.dropdown.is-open .dropdown-menu,
.dropdown:focus-within .dropdown-menu {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
  transition: opacity var(--transition-fast), transform var(--transition-fast), visibility 0s;
  pointer-events: auto;
}

.dropdown-item {
  display: block;
  padding: var(--space-sm) var(--space-md);
  color: var(--text);
  transition: background var(--transition-fast), color var(--transition-fast);
  border-radius: var(--radius-md);
}

.dropdown-item:hover {
  background-color: var(--surface);
  color: var(--primary);
  text-decoration: none;
}

/* Mobile Menu Toggle */
.nav-toggle,
.menu-toggle {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 6px;
  background: none;
  border: 1px solid var(--border);
  border-radius: var(--radius-md);
  cursor: pointer;
  padding: 10px;
}

.nav-toggle__bar,
.menu-toggle__bar {
  width: 22px;
  height: 2px;
  background-color: var(--text);
  border-radius: var(--radius-sm);
  transition: transform var(--transition-fast), opacity var(--transition-fast);
}

body.nav-open .nav-toggle__bar:nth-child(1),
body.nav-open .menu-toggle__bar:nth-child(1) {
  transform: translateY(8px) rotate(45deg);
}

body.nav-open .nav-toggle__bar:nth-child(2),
body.nav-open .menu-toggle__bar:nth-child(2) {
  opacity: 0;
}

body.nav-open .nav-toggle__bar:nth-child(3),
body.nav-open .menu-toggle__bar:nth-child(3) {
  transform: translateY(-8px) rotate(-45deg);
}

.nav-overlay {
  position: fixed;
  inset: 0;
  background: rgba(2, 6, 23, 0.55);
  opacity: 0;
  visibility: hidden;
  pointer-events: none;
  transition: opacity var(--transition-base), visibility 0s linear var(--transition-base);
  z-index: var(--z-fixed);
}

body.nav-open .nav-overlay {
  opacity: 1;
  visibility: visible;
  pointer-events: auto;
  transition: opacity var(--transition-base), visibility 0s;
}

@media (max-width: 1023px) {
  .nav-panel {
    position: fixed;
    top: 0;
    right: 0;
    height: 100dvh;
    width: min(420px, 92vw);
    background: var(--white);
    border-left: 1px solid var(--border);
    padding: var(--space-xl);
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-lg);
    transform: translateX(105%);
    opacity: 0;
    visibility: hidden;
    pointer-events: none;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility 0s linear var(--transition-base);
    z-index: var(--z-modal);
  }

  body.nav-open .nav-panel {
    transform: translateX(0);
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
    transition: transform var(--transition-base), opacity var(--transition-base), visibility 0s;
  }

  .nav-actions {
    margin-top: auto;
  }

  .nav-menu {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-xs);
  }

  .nav-link {
    justify-content: space-between;
    width: 100%;
  }

  .dropdown-menu {
    position: static;
    min-width: auto;
    padding: 0 0 0 var(--space-md);
    border: none;
    box-shadow: none;
    opacity: 1;
    visibility: visible;
    transform: none;
    transition: none;
    pointer-events: auto;
    display: none;
  }

  .dropdown.is-open .dropdown-menu {
    display: block;
  }
}

@media (min-width: 1024px) {
  .nav-toggle,
  .menu-toggle {
    display: none;
  }

  .nav-overlay {
    display: none;
  }

  .nav-panel {
    position: static;
    height: auto;
    width: auto;
    padding: 0;
    border: none;
    transform: none;
    opacity: 1;
    visibility: visible;
    pointer-events: auto;
  }

  .nav-actions {
    padding-left: var(--space-md);
    border-left: 1px solid var(--border);
  }
}

/* ============================================================================
   BUTTON STYLES
   ============================================================================ */

.btn {
  display: inline-block;
  padding: var(--spacing-sm) var(--spacing-lg);
  border: none;
  border-radius: var(--radius-md);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  cursor: pointer;
  transition: all var(--transition-fast);
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: var(--color-primary-dark);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

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

.btn-secondary:hover {
  background-color: var(--primary);
  box-shadow: var(--shadow-lg);
  text-decoration: none;
}

.btn-outline {
  background-color: transparent;
  border: 2px solid var(--primary-light);
  color: var(--primary-light);
}

.btn-outline:hover {
  background-color: var(--primary-light);
  color: var(--color-white);
  text-decoration: none;
}

.btn-outline.btn-outline-inverse {
  border-color: rgba(255, 255, 255, 0.85);
  color: var(--color-white);
}

.btn-outline.btn-outline-inverse:hover {
  background-color: rgba(255, 255, 255, 0.14);
  border-color: rgba(255, 255, 255, 0.85);
  color: var(--color-white);
}

.btn-accent {
  background-color: var(--medical-teal);
  color: var(--color-white);
}

.btn-accent:hover {
  background-color: #0E7490;
  text-decoration: none;
}

.btn-sm {
  padding: var(--spacing-xs) var(--spacing-md);
  font-size: var(--font-size-sm);
}

.btn-lg {
  padding: var(--spacing-md) var(--spacing-2xl);
  font-size: var(--font-size-lg);
}

.btn-block {
  width: 100%;
  display: block;
}

/* ============================================================================
   CARD STYLES
   ============================================================================ */

.card {
  background-color: var(--color-white);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-base);
}

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

.card-image {
  width: 100%;
  height: 250px;
  object-fit: cover;
  border-radius: var(--radius-lg) var(--radius-lg) 0 0;
  margin: -var(--spacing-lg) -var(--spacing-lg) var(--spacing-lg) -var(--spacing-lg);
}

.card-title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-sm);
}

.card-text {
  font-size: var(--font-size-sm);
  color: var(--color-text-light);
  margin-bottom: var(--spacing-md);
}

.card-footer {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-lg);
  padding-top: var(--spacing-lg);
  border-top: 1px solid var(--color-border);
}

/* ============================================================================
   HERO SECTION
   ============================================================================ */

.hero {
  position: relative;
  min-height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: var(--primary);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  color: var(--color-white);
  overflow: hidden;
}

.hero-bg {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(10, 37, 64, 0.74);
  opacity: 1;
  z-index: 0;
  pointer-events: none;
}

.hero-content {
  position: relative;
  z-index: 1;
  text-align: center;
  max-width: 800px;
  padding: var(--spacing-2xl);
}

.hero h1 {
  color: var(--color-white);
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-lg);
}

.hero p {
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-2xl);
}

/* ============================================================================
   SECTION STYLES
   ============================================================================ */

section {
  padding: var(--spacing-3xl) 0;
}

.section-title {
  text-align: center;
  margin-bottom: var(--spacing-2xl);
}

.section-title h2 {
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  color: var(--color-text-light);
  font-size: var(--font-size-lg);
  max-width: 600px;
  margin: 0 auto;
}

/* ============================================================================
   FEATURE SECTION
   ============================================================================ */

.feature {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

@media (min-width: 768px) {
  .feature {
    flex-direction: row;
    align-items: center;
  }
  
  .feature-image {
    flex: 1;
  }
  
  .feature-content {
    flex: 1;
  }
  
  .feature.reverse {
    flex-direction: row-reverse;
  }
}

.feature-image img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
}

.feature-content h3 {
  margin-bottom: var(--spacing-md);
}

.feature-list {
  list-style: none;
  margin-bottom: var(--spacing-lg);
}

.feature-list li {
  padding: var(--spacing-sm) 0;
  padding-left: var(--spacing-2xl);
  position: relative;
  color: var(--color-text-light);
}

.feature-list li:before {
  content: '✓';
  position: absolute;
  left: 0;
  color: var(--color-success);
  font-weight: var(--font-weight-bold);
  font-size: var(--font-size-lg);
}

/* ============================================================================
   FOOTER STYLES
   ============================================================================ */

footer {
  background-color: var(--primary);
  color: var(--color-white);
  padding: var(--spacing-3xl) 0 var(--spacing-lg);
  margin-top: var(--spacing-3xl);
}

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

@media (min-width: 768px) {
  .footer-content {
    grid-template-columns: repeat(3, 1fr);
  }
}

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

.footer-section h4 {
  color: var(--color-white);
  margin-bottom: var(--spacing-md);
}

.footer-section ul {
  list-style: none;
}

.footer-section li {
  margin-bottom: var(--spacing-sm);
}

.footer-section a {
  color: rgba(255, 255, 255, 0.7);
  transition: color var(--transition-fast);
}

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

.footer-bottom {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  text-align: center;
  color: rgba(255, 255, 255, 0.6);
  font-size: var(--font-size-sm);
}

/* ============================================================================
   UTILITY CLASSES
   ============================================================================ */

.text-center {
  text-align: center;
}

.text-left {
  text-align: left;
}

.text-right {
  text-align: right;
}

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

.text-primary {
  color: var(--color-primary);
}

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

.text-accent {
  color: var(--color-accent);
}

.text-light {
  color: var(--color-text-light);
}

.text-white {
  color: var(--color-white);
}

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

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

.bg-light {
  background-color: var(--color-light-gray);
}

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

.py-sm {
  padding-top: var(--spacing-sm);
  padding-bottom: var(--spacing-sm);
}

.py-md {
  padding-top: var(--spacing-md);
  padding-bottom: var(--spacing-md);
}

.py-lg {
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
}

.py-xl {
  padding-top: var(--spacing-xl);
  padding-bottom: var(--spacing-xl);
}

.py-2xl {
  padding-top: var(--spacing-2xl);
  padding-bottom: var(--spacing-2xl);
}

.px-sm {
  padding-left: var(--spacing-sm);
  padding-right: var(--spacing-sm);
}

.px-md {
  padding-left: var(--spacing-md);
  padding-right: var(--spacing-md);
}

.px-lg {
  padding-left: var(--spacing-lg);
  padding-right: var(--spacing-lg);
}

.px-xl {
  padding-left: var(--spacing-xl);
  padding-right: var(--spacing-xl);
}

.mx-auto {
  margin-left: auto;
  margin-right: auto;
}

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

.mt-md {
  margin-top: var(--spacing-md);
}

.mt-lg {
  margin-top: var(--spacing-lg);
}

.mt-xl {
  margin-top: var(--spacing-xl);
}

.mb-sm {
  margin-bottom: var(--spacing-sm);
}

.mb-md {
  margin-bottom: var(--spacing-md);
}

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

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

.hidden {
  display: none !important;
}

.visible {
  display: block !important;
}

.opacity-50 {
  opacity: 0.5;
}

.opacity-75 {
  opacity: 0.75;
}

.rounded {
  border-radius: var(--radius-md);
}

.rounded-lg {
  border-radius: var(--radius-lg);
}

.rounded-full {
  border-radius: var(--radius-full);
}

.shadow {
  box-shadow: var(--shadow-md);
}

.shadow-lg {
  box-shadow: var(--shadow-lg);
}

.border {
  border: 1px solid var(--color-border);
}

.border-top {
  border-top: 1px solid var(--color-border);
}

.border-bottom {
  border-bottom: 1px solid var(--color-border);
}

/* ============================================================================
   RESPONSIVE UTILITIES
   ============================================================================ */

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

@media (min-width: 768px) {
  .show-mobile {
    display: none !important;
  }
}

/* ============================================================================
   ANIMATIONS
   ============================================================================ */

@keyframes fadeIn {
  from {
    opacity: 0;
  }
  to {
    opacity: 1;
  }
}

@keyframes slideInUp {
  from {
    opacity: 0;
    transform: translateY(30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInDown {
  from {
    opacity: 0;
    transform: translateY(-30px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes slideInLeft {
  from {
    opacity: 0;
    transform: translateX(-30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes slideInRight {
  from {
    opacity: 0;
    transform: translateX(30px);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.fade-in {
  animation: fadeIn var(--transition-base);
}

.slide-in-up {
  animation: slideInUp var(--transition-base);
}

.slide-in-down {
  animation: slideInDown var(--transition-base);
}

.slide-in-left {
  animation: slideInLeft var(--transition-base);
}

.slide-in-right {
  animation: slideInRight var(--transition-base);
}

/* ============================================================================
   FORM STYLES
   ============================================================================ */

.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  margin-bottom: var(--spacing-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text);
}

input[type="text"],
input[type="email"],
input[type="phone"],
input[type="number"],
textarea,
select {
  width: 100%;
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-family: var(--font-primary);
  font-size: var(--font-size-base);
  transition: all var(--transition-fast);
}

input[type="text"]:focus,
input[type="email"]:focus,
input[type="phone"]:focus,
input[type="number"]:focus,
textarea:focus,
select:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px rgba(8, 145, 178, 0.22);
}

textarea {
  resize: vertical;
  min-height: 120px;
}

/* ============================================================================
   TABLE STYLES
   ============================================================================ */

table {
  width: 100%;
  border-collapse: collapse;
  margin-bottom: var(--spacing-lg);
}

th {
  background-color: var(--color-light-gray);
  padding: var(--spacing-md);
  text-align: left;
  font-weight: var(--font-weight-bold);
  border-bottom: 2px solid var(--color-border);
}

td {
  padding: var(--spacing-md);
  border-bottom: 1px solid var(--color-border);
}

tr:hover {
  background-color: var(--color-light-gray);
}

/* ============================================================================
   BREADCRUMB STYLES
   ============================================================================ */

.breadcrumb {
  display: flex;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-lg);
  font-size: var(--font-size-sm);
}

.breadcrumb a {
  color: var(--color-primary);
}

.breadcrumb span {
  color: var(--color-text-light);
}

/* ============================================================================
   PAGINATION STYLES
   ============================================================================ */

.pagination {
  display: flex;
  gap: var(--spacing-sm);
  justify-content: center;
  margin-top: var(--spacing-2xl);
}

.pagination a,
.pagination span {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-primary);
  transition: all var(--transition-fast);
}

.pagination a:hover {
  background-color: var(--color-primary);
  color: var(--color-white);
  text-decoration: none;
}

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

/* ============================================================================
   RESPONSIVE IMAGES
   ============================================================================ */

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

.img-responsive {
  width: 100%;
  height: auto;
}

.img-rounded {
  border-radius: var(--radius-lg);
}

.img-circle {
  border-radius: 50%;
}

/* ============================================================================
   REFACTOR COMPONENTS (Dual-Track Precision)
   ============================================================================ */

.page-hero {
  position: relative;
  padding: var(--space-3xl) 0;
  background-color: var(--primary);
  background-image: var(--hero-image);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  color: var(--white);
  overflow: hidden;
}

.page-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(10, 37, 64, 0.76);
  pointer-events: none;
}

.page-hero .container {
  position: relative;
  z-index: 1;
}

.page-hero h1 {
  color: var(--white);
  margin-bottom: var(--space-sm);
}

.page-hero p {
  color: rgba(248, 250, 252, 0.9);
  max-width: 60ch;
}

.cta-banner {
  position: relative;
  padding: var(--space-3xl) 0;
  background-color: var(--primary);
  background-image: var(--cta-image);
  background-repeat: no-repeat;
  background-size: cover;
  background-position: center;
  color: var(--white);
  overflow: hidden;
}

.cta-banner::before {
  content: "";
  position: absolute;
  inset: 0;
  background: rgba(10, 37, 64, 0.78);
  pointer-events: none;
}

.cta-banner .container {
  position: relative;
  z-index: 1;
}

.cta-banner h2 {
  color: var(--white);
}

.cta-banner p {
  color: rgba(248, 250, 252, 0.9);
}

.cert-wall {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-sm);
  justify-content: center;
  align-items: center;
}

.cert-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-sm);
  padding: var(--space-sm) var(--space-md);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  font-size: var(--font-size-sm);
  color: var(--text);
  white-space: nowrap;
}

.cert-badge::before {
  content: "";
  width: 8px;
  height: 8px;
  border-radius: 9999px;
  background: var(--precision-silver);
}

.cert-badge--medical::before {
  background: var(--medical-teal);
}

.cert-badge--aero::before {
  background: var(--primary-light);
}

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

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

.track-card {
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  overflow: hidden;
  display: grid;
  grid-template-rows: auto 1fr;
}

.track-card__media {
  width: 100%;
  height: 220px;
  object-fit: cover;
}

.track-card__body {
  padding: var(--space-lg);
}

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

.track-card__title::before {
  content: "";
  width: 10px;
  height: 10px;
  border-radius: 9999px;
  background: var(--precision-silver);
}

.track-card--medical .track-card__title::before {
  background: var(--medical-teal);
}

.track-card--aero .track-card__title::before {
  background: var(--primary-light);
}

.capability-matrix {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-md);
}

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

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

.capability-tile {
  display: grid;
  gap: var(--space-sm);
  padding: var(--space-lg);
  background: var(--white);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-sm);
  color: var(--text);
  text-decoration: none;
  transition: box-shadow var(--transition-base), transform var(--transition-base), border-color var(--transition-base);
}

.capability-tile:hover {
  border-color: var(--border-dark);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
  text-decoration: none;
}

.capability-tile__icon {
  width: 36px;
  height: 36px;
  color: var(--primary-light);
}

.capability-tile__icon--medical {
  color: var(--medical-teal);
}

.carousel {
  position: relative;
}

.carousel-track {
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(260px, 82vw);
  gap: var(--space-md);
  overflow-x: auto;
  overscroll-behavior-x: contain;
  scroll-snap-type: x mandatory;
  scroll-padding-inline: var(--space-md);
  padding-bottom: var(--space-md);
  -webkit-overflow-scrolling: touch;
}

@media (min-width: 768px) {
  .carousel-track {
    grid-auto-columns: minmax(320px, 1fr);
  }
}

.carousel-item {
  scroll-snap-align: start;
}

.carousel-controls {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-sm);
  margin-top: var(--space-sm);
}

.carousel-btn {
  padding: var(--space-sm) var(--space-md);
  border-radius: var(--radius-md);
  border: 1px solid var(--border);
  background: var(--white);
  color: var(--text);
  cursor: pointer;
  transition: background var(--transition-fast), color var(--transition-fast), border-color var(--transition-fast);
}

.carousel-btn:hover {
  background: var(--surface);
  border-color: var(--border-dark);
}

.carousel-btn:disabled {
  opacity: 0.55;
  cursor: not-allowed;
}

/* ============================================================================
   GLOBAL DISABLED STYLES
   ============================================================================ */

button:disabled,
input:disabled,
select:disabled,
textarea:disabled {
  cursor: not-allowed;
  opacity: 0.6;
}

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

@media print {
  body {
    background-color: var(--color-white);
  }
  
  header,
  footer,
  .no-print {
    display: none;
  }
  
  a {
    text-decoration: underline;
  }
}