:root {
  /* Color Palette - Premium Vascular */
  --color-primary: #0a2540; /* Deep Navy - Trust, Professionalism */
  --color-secondary: #c0392b; /* Vascular Red - Accent */
  --color-text-dark: #333333; /* Readable Text */
  --color-text-light: #666666; /* Subtitles */
  --color-bg-light: #f8f9fa; /* Off-white background */
  --color-white: #ffffff;
  --color-border: #e1e4e8;

  /* Typography */
  --font-heading: 'Montserrat', sans-serif;
  --font-body: 'Open Sans', sans-serif;

  /* Spacing */
  --spacing-sm: 0.5rem;
  --spacing-md: 1rem;
  --spacing-lg: 2rem;
  --spacing-xl: 4rem;
  
  /* Shadows */
  --shadow-sm: 0 2px 4px rgba(0,0,0,0.05);
  --shadow-md: 0 4px 6px rgba(0,0,0,0.1);
  --shadow-lg: 0 10px 15px rgba(0,0,0,0.1);
}

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

body {
  font-family: var(--font-body);
  color: var(--color-text-dark);
  line-height: 1.6;
  background-color: var(--color-bg-light);
}

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

a {
  text-decoration: none;
  color: var(--color-primary);
  transition: color 0.3s ease;
}

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

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

.btn {
  display: inline-block;
  padding: 12px 24px;
  border-radius: 4px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.5px;
  cursor: pointer;
  transition: all 0.3s ease;
}

.btn-primary {
  background-color: var(--color-secondary);
  color: var(--color-white);
  border: 2px solid var(--color-secondary);
}

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

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

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

/* Header */
header {
  background-color: var(--color-white);
  box-shadow: var(--shadow-sm);
  position: sticky;
  top: 0;
  z-index: 1000;
}

nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 80px;
}

.logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--color-primary);
}

.nav-links {
  display: flex;
  gap: var(--spacing-lg);
  list-style: none;
}

.nav-links a {
  font-weight: 500;
  font-size: 1rem;
}

/* Hero Section */
.hero {
  background: linear-gradient(rgba(10, 37, 64, 0.8), rgba(10, 37, 64, 0.8)), url('../images/hero-bg.jpg');
  background-size: cover;
  background-position: center;
  color: var(--color-white);
  padding: 120px 0;
  text-align: center;
}

.hero h1 {
  color: var(--color-white);
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.hero p {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
}

/* Services Section */
.services {
  padding: var(--spacing-xl) 0;
  background-color: var(--color-white);
}

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

.section-title h2 {
  font-size: 2.5rem;
  position: relative;
  display: inline-block;
}

.section-title h2::after {
  content: '';
  display: block;
  width: 60px;
  height: 3px;
  background-color: var(--color-secondary);
  margin: var(--spacing-sm) auto 0;
}

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

.service-card {
  background: var(--color-bg-light);
  padding: var(--spacing-lg);
  border-radius: 8px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border-top: 4px solid var(--color-primary);
}

.service-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.service-icon {
  font-size: 2rem;
  color: var(--color-secondary);
  margin-bottom: var(--spacing-md);
}

/* Blog Section */
.blog-section {
  padding: var(--spacing-xl) 0;
}

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

.blog-card {
  background: var(--color-white);
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.blog-content {
  padding: var(--spacing-md);
}

.blog-date {
  font-size: 0.85rem;
  color: var(--color-text-light);
  margin-bottom: var(--spacing-sm);
}

/* Footer */
footer {
  background-color: var(--color-primary);
  color: var(--color-white);
  padding: var(--spacing-xl) 0 var(--spacing-lg);
}

.footer-content {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--spacing-xl);
}

.footer-logo {
  font-family: var(--font-heading);
  font-size: 1.5rem;
  font-weight: 700;
  margin-bottom: var(--spacing-md);
}

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

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

.footer-links a:hover {
  color: var(--color-white);
}

.copyright {
  text-align: center;
  margin-top: var(--spacing-xl);
  padding-top: var(--spacing-lg);
  border-top: 1px solid rgba(255,255,255,0.1);
  font-size: 0.9rem;
  color: rgba(255,255,255,0.6);
}

/* Mobile Responsive */
@media (max-width: 768px) {
  .hero h1 {
    font-size: 2rem;
  }
  
  .nav-links {
    display: none; /* simple hide for now, would implement burger menu later */
  }
}