:root {
  
  --primary-blue: #001F3F; 
  --secondary-blue: #0074D9; 
  --neon-teal: #00FFFF; 
  --neon-green: #39FF14; 
  --metallic-grey: #A9A9A9; 
  --dark-grey: #333333; 
  --light-grey: #F5F5F5; 
  --white: #FFFFFF;
  --black: #000000;

  --font-family-base: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-family-heading: 'Oxanium', var(--font-family-base);
  --font-size-h1: 3.5rem;
  --font-size-h2: 2.5rem;
  --font-size-h3: 2rem;
  --font-size-h4: 1.5rem;
  --font-size-h5: 1.25rem;
  --font-size-h6: 1rem;
  --font-size-body: 1rem;
  --font-size-small: 0.875rem;
  --line-height-base: 1.6;
  --line-height-heading: 1.2;

  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 1.5rem;
  --spacing-xl: 2rem;
  --spacing-2xl: 3rem;
  --spacing-3xl: 4rem;

  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.5rem;
  --border-radius-lg: 1rem;

  --shadow-sm: 0 2px 4px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 4px 8px rgba(0, 0, 0, 0.15);
  --shadow-lg: 0 8px 16px rgba(0, 0, 0, 0.2);
  --shadow-neon: 0 0 10px var(--neon-teal);

  --transition-fast: 0.2s ease;
  --transition-normal: 0.3s ease;
  --transition-slow: 0.5s ease;
}

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

html {
  font-size: 16px;
  line-height: 1.5;
  scroll-behavior: smooth;
}

body {
  margin: 0;
  padding: 0;
  font-family: var(--font-family-base);
  font-size: var(--font-size-body);
  line-height: var(--line-height-base);
  color: var(--dark-grey);
  background-color: var(--light-grey);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

h1, h2, h3, h4, h5, h6 {
  font-family: var(--font-family-heading);
  font-weight: 700;
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  line-height: var(--line-height-heading);
}

p {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
}

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

a:hover,
a:focus {
  color: var(--neon-green);
  outline: 2px solid var(--neon-teal);
  outline-offset: 2px;
}

img,
video {
  max-width: 100%;
  height: auto;
}

ul, ol {
  margin-top: 0;
  margin-bottom: var(--spacing-md);
  padding-left: var(--spacing-lg);
}

button,
input,
select,
textarea {
  font-family: inherit;
  font-size: inherit;
}

h1 { font-size: var(--font-size-h1); }
h2 { font-size: var(--font-size-h2); }
h3 { font-size: var(--font-size-h3); }
h4 { font-size: var(--font-size-h4); }
h5 { font-size: var(--font-size-h5); }
h6 { font-size: var(--font-size-h6); }

body {
  color: var(--dark-grey);
}

.lead {
  font-size: 1.25rem;
  font-weight: 300;
}

.container-custom {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md);
}

.d-flex {
  display: flex;
}

.justify-content-center {
  justify-content: center;
}

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

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

.custom-grid {
  display: grid;
  gap: var(--spacing-md);
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
}

@media (min-width: 768px) {
  .tablet-hide { display: none; }
  .mobile-only { display: none; }
}

@media (min-width: 1024px) {
  .desktop-only { display: block; }
  .tablet-only { display: none; }
}

.btn-primary {
  background-color: var(--primary-blue);
  color: var(--white);
  border: none;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-md);
  font-weight: 600;
  transition: all var(--transition-normal);
  cursor: pointer;
}

.btn-primary:hover,
.btn-primary:focus {
  background-color: var(--secondary-blue);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  outline: none;
}

.btn-secondary {
  background-color: transparent;
  color: var(--neon-teal);
  border: 2px solid var(--neon-teal);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-md);
  font-weight: 600;
  transition: all var(--transition-normal);
}

.btn-secondary:hover,
.btn-secondary:focus {
  background-color: var(--neon-teal);
  color: var(--primary-blue);
  transform: scale(1.05);
}

.row[class*='g-'] > [class*='col-']:has([class*='card']) { 
  display: flex !important; 
  flex-direction: column !important; 
}

[class*='card'] { 
  flex: 1; 
  display: flex; 
  flex-direction: column; 
  height: 100%; 
}

.card {
  background: var(--white);
  border: 1px solid var(--metallic-grey);
  border-radius: var(--border-radius-lg);
  padding: var(--spacing-lg);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  position: relative;
  overflow: hidden;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-lg);
  border-color: var(--neon-teal);
}

.card-header {
  font-size: var(--font-size-h5);
  color: var(--primary-blue);
  margin-bottom: var(--spacing-md);
}

.card-body {
  flex-grow: 1;
}

.card-footer {
  margin-top: auto;
  padding-top: var(--spacing-md);
  border-top: 1px solid var(--metallic-grey);
}

.form-control {
  border: 1px solid var(--metallic-grey);
  border-radius: var(--border-radius-sm);
  padding: var(--spacing-sm);
  transition: border-color var(--transition-fast);
}

.form-control:focus {
  border-color: var(--neon-teal);
  box-shadow: 0 0 0 0.2rem rgba(0, 255, 255, 0.25);
  outline: none;
}

.form-label {
  font-weight: 600;
  color: var(--dark-grey);
}

.navbar-custom {
  background: rgba(0, 31, 63, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--metallic-grey);
}

.navbar-brand {
  font-family: var(--font-family-heading);
  font-size: var(--font-size-h4);
  color: var(--neon-teal) !important;
}

.nav-link {
  color: var(--white) !important;
  transition: color var(--transition-fast);
}

.nav-link:hover,
.nav-link:focus {
  color: var(--neon-green) !important;
}

.hero {
  background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-blue) 100%);
  color: var(--white);
  padding: var(--spacing-3xl) 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><defs><pattern id="grain" width="100" height="100" patternUnits="userSpaceOnUse"><circle cx="25" cy="25" r="1" fill="white" opacity="0.1"/><circle cx="75" cy="75" r="1" fill="white" opacity="0.1"/></pattern></defs><rect width="100" height="100" fill="url(%23grain)"/></svg>') repeat;
  opacity: 0.1;
  animation: float 20s ease-in-out infinite;
}

@keyframes float {
  0%, 100% { transform: translateY(0px); }
  50% { transform: translateY(-10px); }
}

* {
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.btn:focus,
.card:focus-within,
.nav-link:focus {
  outline: 2px solid var(--neon-teal);
  outline-offset: 2px;
}

body,
.card,
.hero {
  color: var(--white); 
}

body,
.card {
  background: var(--white);
  color: var(--dark-grey);
}

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

.bg-dark-custom {
  background-color: var(--primary-blue) !important;
  color: var(--white) !important;
}

@media (max-width: 767.98px) {
  :root {
    --font-size-h1: 2.5rem;
    --font-size-h2: 2rem;
  }
  
  .hero {
    padding: var(--spacing-xl) 0;
  }
}

.text-center { text-align: center; }
.mb-0 { margin-bottom: 0 !important; }
.mt-0 { margin-top: 0 !important; }

.lg-toolbar .lg-close::after { color: var(--neon-teal); }

#particles-js {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
}

#three-canvas {
  width: 100%;
  height: 400px;
  border-radius: var(--border-radius-lg);
}

.rellax {
  will-change: transform;
}