/* CSS Variables for Design System */
:root {
  /* Colors */
  --primary-color: #0072ce; /* Tech Blue */
  --primary-light: #e6f0f9;
  --secondary-color: #f8f9fa; /* Light Gray Background */
  --accent-color: #ff6b35; /* Orange for CTAs */
  --text-primary: #212529;
  --text-secondary: #6c757d;
  --white: #ffffff;
  --border-color: #dee2e6;
  --shadow: 0 4px 6px rgba(0, 0, 0, 0.07);
  --shadow-hover: 0 6px 12px rgba(0, 0, 0, 0.1);

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-xxl: 4rem;

  /* Typography */
  --font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-md: 1.125rem;
  --font-size-lg: 1.25rem;
  --font-size-xl: 1.5rem;
  --font-size-2xl: 1.875rem;
  --font-size-3xl: 2.25rem;
  --font-size-4xl: 3rem;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;

  /* Border Radius */
  --border-radius: 8px;
  --border-radius-component: 12px;

  /* Layout */
  --container-width: 1200px;
  --grid-gap: var(--spacing-md);
}

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

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

h1, h2, h3, h4, h5, h6 {
  font-weight: var(--font-weight-semibold);
  line-height: 1.2;
  margin-bottom: var(--spacing-sm);
}

h1 {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: var(--font-size-2xl);
  margin-bottom: var(--spacing-lg);
  position: relative;
  display: inline-block;
}

h2:after {
  content: '';
  position: absolute;
  bottom: -8px;
  left: 0;
  width: 50px;
  height: 3px;
  background: var(--primary-color);
  border-radius: 2px;
}

h3 {
  font-size: var(--font-size-xl);
  margin-bottom: var(--spacing-sm);
}

p {
  margin-bottom: var(--spacing-sm);
  color: var(--text-secondary);
}

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

a:hover {
  color: #0059a3;
}

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

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

/* Button Styles */
.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) calc(var(--spacing-md) * 1.2);
  border-radius: var(--border-radius);
  font-weight: var(--font-weight-semibold);
  text-align: center;
  cursor: pointer;
  transition: all 0.3s ease;
  border: none;
  font-size: var(--font-size-base);
}

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

.btn-primary:hover {
  background-color: #e55a2b;
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

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

.btn-secondary:hover {
  background-color: #0059a3;
  box-shadow: var(--shadow-hover);
  transform: translateY(-2px);
}

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

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

/* Header & Navigation */
.header {
  position: sticky;
  top: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  box-shadow: var(--shadow);
}

.navbar {
  padding: var(--spacing-sm) 0;
}

.nav-container {
  max-width: var(--container-width);
  margin: 0 auto;
  padding: 0 var(--spacing-md);
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo h2 {
  color: var(--primary-color);
  font-size: var(--font-size-xl);
}

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

.nav-menu a {
  color: var(--text-primary);
  font-weight: var(--font-weight-medium);
  position: relative;
}

.nav-menu a:hover {
  color: var(--primary-color);
}

.nav-menu a:after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--primary-color);
  transition: width 0.3s ease;
}

.nav-menu a:hover:after {
  width: 100%;
}

.hamburger {
  display: none;
  flex-direction: column;
  cursor: pointer;
}

.hamburger span {
  width: 25px;
  height: 3px;
  background-color: var(--text-primary);
  margin: 3px 0;
  transition: 0.3s;
}

/* Hero Banner */
.hero-banner {
  background: linear-gradient(135deg, var(--primary-color) 0%, #004a8c 100%);
  color: var(--white);
  padding: calc(var(--spacing-xl) * 2) var(--spacing-md);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero-banner:before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-image: 
    radial-gradient(circle at 10% 20%, rgba(255, 255, 255, 0.05) 0%, transparent 20%),
    radial-gradient(circle at 90% 80%, rgba(255, 255, 255, 0.05) 0%, transparent 20%);
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  max-width: var(--container-width);
  margin: 0 auto;
}

.hero-content h1 {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
  max-width: 800px;
  margin-left: auto;
  margin-right: auto;
}

.hero-content p {
  font-size: var(--font-size-lg);
  margin-bottom: calc(var(--spacing-lg) * 1.5);
  max-width: 600px;
  margin-left: auto;
  margin-right: auto;
}

.cta-buttons {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
}

/* Sections */
.section {
  padding: calc(var(--spacing-xl) * 1.5) var(--spacing-md);
}

.section.core-advantages,
.section.core-products,
.section.solutions {
  background-color: var(--secondary-color);
}

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

.section.final-cta {
  background: linear-gradient(135deg, var(--primary-color) 0%, #004a8c 100%);
  color: var(--white);
  text-align: center;
}

/* Grid Systems */
.features-grid,
.products-grid,
.solutions-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: var(--grid-gap);
  margin-top: var(--spacing-lg);
}

/* Cards */
.feature-card,
.product-card,
.solution-card {
  background: var(--white);
  border-radius: var(--border-radius-component);
  padding: var(--spacing-lg);
  text-align: center;
  box-shadow: var(--shadow);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.feature-card:hover,
.product-card:hover,
.solution-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-hover);
}

.icon {
  font-size: var(--font-size-3xl);
  margin-bottom: var(--spacing-md);
  width: 70px;
  height: 70px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 50%;
  background: var(--primary-light);
  color: var(--primary-color);
}

.feature-card h3,
.product-card h3,
.solution-card h3 {
  margin-bottom: var(--spacing-sm);
}

.feature-card p,
.product-card p,
.solution-card p {
  margin-bottom: var(--spacing-md);
  color: var(--text-secondary);
}

.image-placeholder {
  font-size: var(--font-size-4xl);
  margin-bottom: var(--spacing-md);
  width: 100px;
  height: 100px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--border-radius);
  background: var(--primary-light);
  color: var(--primary-color);
}

/* News Section */
.news-tabs {
  display: flex;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  gap: var(--spacing-sm);
}

.tab-btn {
  padding: var(--spacing-sm) var(--spacing-md);
  border: 1px solid var(--border-color);
  background: var(--white);
  cursor: pointer;
  border-radius: var(--border-radius);
  font-weight: var(--font-weight-medium);
  transition: all 0.3s ease;
}

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

.tab-btn:hover {
  background: var(--primary-light);
  border-color: var(--primary-color);
}

.tab-content {
  display: none;
}

.tab-content.active {
  display: block;
}

.news-items {
  display: grid;
  gap: var(--spacing-sm);
}

.news-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: var(--spacing-sm);
  border-bottom: 1px solid var(--border-color);
}

.news-item h3 {
  font-size: var(--font-size-base);
  margin: 0;
  flex: 1;
}

.news-item time {
  color: var(--text-secondary);
  font-size: var(--font-size-sm);
  white-space: nowrap;
  margin-left: var(--spacing-md);
}

/* Final CTA */
.final-cta .container {
  max-width: 600px;
  text-align: center;
}

.final-cta h2 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

.final-cta p {
  color: var(--white);
  margin-bottom: var(--spacing-lg);
}

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

.final-cta .btn:hover {
  background-color: var(--primary-light);
  color: var(--primary-color);
}

/* Footer */
.footer {
  background-color: var(--text-primary);
  color: var(--white);
  padding: calc(var(--spacing-xl) * 1.5) var(--spacing-md) var(--spacing-md);
}

.footer-content {
  max-width: var(--container-width);
  margin: 0 auto;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
  gap: var(--spacing-xl);
  margin-bottom: var(--spacing-xl);
}

.footer-section h3,
.footer-section h4 {
  color: var(--white);
  margin-bottom: var(--spacing-md);
}

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

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

.footer-section ul li a {
  color: #adb5bd;
  transition: color 0.3s ease;
}

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

.footer-bottom {
  max-width: var(--container-width);
  margin: 0 auto;
  padding-top: var(--spacing-md);
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  text-align: center;
  color: #adb5bd;
}

/* Responsive Design */
@media screen and (max-width: 1199px) {
  :root {
    --container-width: 960px;
  }
  
  h1 {
    font-size: var(--font-size-2xl);
  }
  
  h2 {
    font-size: var(--font-size-xl);
  }
  
  .hero-content h1 {
    font-size: var(--font-size-3xl);
  }
}

@media screen and (max-width: 768px) {
  :root {
    --container-width: 100%;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
  }
  
  .nav-menu {
    position: fixed;
    left: -100%;
    top: 70px;
    flex-direction: column;
    background-color: var(--white);
    width: 100%;
    text-align: center;
    transition: 0.3s;
    box-shadow: var(--shadow);
    padding: var(--spacing-lg) 0;
    align-items: center;
  }
  
  .nav-menu.active {
    left: 0;
  }
  
  .hamburger {
    display: flex;
  }
  
  .hamburger.active span:nth-child(2) {
    opacity: 0;
  }
  
  .hamburger.active span:nth-child(1) {
    transform: translateY(8px) rotate(45deg);
  }
  
  .hamburger.active span:nth-child(3) {
    transform: translateY(-8px) rotate(-45deg);
  }
  
  .hero-content h1 {
    font-size: var(--font-size-2xl);
  }
  
  .hero-content p {
    font-size: var(--font-size-base);
  }
  
  .cta-buttons {
    flex-direction: column;
    align-items: center;
  }
  
  .section {
    padding: var(--spacing-xl) var(--spacing-md);
  }
  
  .features-grid,
  .products-grid,
  .solutions-grid {
    grid-template-columns: 1fr;
  }
  
  .news-item {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--spacing-xs);
  }
}

@media screen and (max-width: 480px) {
  h1 {
    font-size: var(--font-size-xl);
  }
  
  h2 {
    font-size: var(--font-size-lg);
  }
  
  .hero-content h1 {
    font-size: var(--font-size-xl);
  }
  
  .final-cta h2 {
    font-size: var(--font-size-2xl);
  }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
  * {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}

/* Focus Styles for Accessibility */
a:focus,
button:focus,
input:focus,
select:focus,
textarea:focus {
  outline: 2px solid var(--primary-color);
  outline-offset: 2px;
}