/* CSS Custom Properties */
:root {
  /* Colors */
  --color-primary: #0066cc;
  --color-primary-dark: #004499;
  --color-primary-light: #3399ff;
  --color-secondary: #6c757d;
  --color-accent: #ff6b35;
  --color-success: #28a745;
  --color-warning: #ffc107;
  --color-danger: #dc3545;
  
  /* Neutral Colors */
  --color-white: #ffffff;
  --color-gray-50: #f8f9fa;
  --color-gray-100: #e9ecef;
  --color-gray-200: #dee2e6;
  --color-gray-300: #ced4da;
  --color-gray-400: #adb5bd;
  --color-gray-500: #6c757d;
  --color-gray-600: #495057;
  --color-gray-700: #343a40;
  --color-gray-800: #212529;
  --color-gray-900: #0d1117;
  
  /* Typography */
  --font-family-primary: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
  --font-size-xs: 0.75rem;
  --font-size-sm: 0.875rem;
  --font-size-base: 1rem;
  --font-size-lg: 1.125rem;
  --font-size-xl: 1.25rem;
  --font-size-2xl: 1.5rem;
  --font-size-3xl: 1.875rem;
  --font-size-4xl: 2.25rem;
  --font-size-5xl: 3rem;
  
  /* Font Weights */
  --font-weight-light: 300;
  --font-weight-normal: 400;
  --font-weight-medium: 500;
  --font-weight-semibold: 600;
  --font-weight-bold: 700;
  
  /* Spacing */
  --spacing-xs: 0.25rem;
  --spacing-sm: 0.5rem;
  --spacing-md: 0.75rem;
  --spacing-lg: 1rem;
  --spacing-xl: 1.5rem;
  --spacing-2xl: 2rem;
  --spacing-3xl: 3rem;
  --spacing-4xl: 4rem;
  --spacing-5xl: 5rem;
  
  /* Border Radius */
  --border-radius-sm: 0.25rem;
  --border-radius-md: 0.375rem;
  --border-radius-lg: 0.5rem;
  --border-radius-xl: 0.75rem;
  --border-radius-2xl: 1rem;
  
  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.05);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
  --shadow-xl: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
  
  /* Transitions */
  --transition-fast: 0.15s ease-in-out;
  --transition-normal: 0.3s ease-in-out;
  --transition-slow: 0.5s ease-in-out;
  
  /* Layout */
  --container-max-width: 1200px;
  --header-height: 80px;
  --header-height-mobile: 70px;
}

/* Reset and Base Styles */
*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

body {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-normal);
  line-height: 1.6;
  color: var(--color-gray-800);
  background-color: var(--color-white);
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

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

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

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

/* Container */
.container {
  max-width: var(--container-max-width);
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

@media (min-width: 768px) {
  .container {
    padding: 0 var(--spacing-2xl);
  }
}

/* Typography */
.section__title {
  font-size: var(--font-size-3xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
}

.section__description {
  font-size: var(--font-size-lg);
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-2xl);
  max-width: 600px;
}

/* Buttons */
.btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) var(--spacing-xl);
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  border-radius: var(--border-radius-lg);
  transition: all var(--transition-fast);
  cursor: pointer;
  border: none;
  white-space: nowrap;
}

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

.btn--primary:hover {
  background-color: var(--color-primary-dark);
  color: var(--color-white);
  box-shadow: var(--shadow-md);
  transform: translateY(-1px);
}

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

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

/* Header */
.header {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  z-index: 1000;
  background-color: rgba(255, 255, 255, 0.95);
  backdrop-filter: blur(10px);
  border-bottom: 1px solid var(--color-gray-200);
  height: var(--header-height-mobile);
  transition: all var(--transition-fast);
}

@media (min-width: 768px) {
  .header {
    height: var(--header-height);
  }
}

.header__content {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: 100%;
}

/* Logo */
.logo {
  display: flex;
  flex-direction: column;
  text-decoration: none;
  color: var(--color-gray-900);
}

.logo__text {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-primary);
  line-height: 1;
}

.logo__tagline {
  font-size: var(--font-size-xs);
  color: var(--color-gray-600);
  line-height: 1;
  margin-top: 2px;
}

/* Navigation */
.nav {
  display: none;
}

@media (min-width: 768px) {
  .nav {
    display: block;
  }
}

.nav__list {
  display: flex;
  align-items: center;
  gap: var(--spacing-2xl);
  list-style: none;
}

.nav__item {
  position: relative;
}

.nav__link {
  display: flex;
  align-items: center;
  gap: var(--spacing-xs);
  padding: var(--spacing-sm) 0;
  font-weight: var(--font-weight-medium);
  color: var(--color-gray-700);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.nav__link:hover,
.nav__link--active {
  color: var(--color-primary);
}

.nav__icon {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.nav__item--dropdown:hover .nav__icon {
  transform: rotate(180deg);
}

/* Dropdown */
.nav__dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  min-width: 220px;
  background-color: var(--color-white);
  border: 1px solid var(--color-gray-200);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transform: translateY(-10px);
  transition: all var(--transition-fast);
  list-style: none;
  padding: var(--spacing-sm);
  z-index: 100;
}

.nav__item--dropdown:hover .nav__dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav__dropdown-link {
  display: block;
  padding: var(--spacing-sm) var(--spacing-md);
  color: var(--color-gray-700);
  text-decoration: none;
  border-radius: var(--border-radius-md);
  transition: all var(--transition-fast);
}

.nav__dropdown-link:hover {
  background-color: var(--color-gray-50);
  color: var(--color-primary);
}

/* Mobile Menu Button */
.mobile-menu-btn {
  display: flex;
  flex-direction: column;
  justify-content: center;
  width: 32px;
  height: 32px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 0;
  gap: 4px;
}

@media (min-width: 768px) {
  .mobile-menu-btn {
    display: none;
  }
}

.mobile-menu-btn__line {
  width: 100%;
  height: 2px;
  background-color: var(--color-gray-700);
  transition: all var(--transition-fast);
  transform-origin: center;
}

.mobile-menu-btn--active .mobile-menu-btn__line:nth-child(1) {
  transform: rotate(45deg) translate(6px, 6px);
}

.mobile-menu-btn--active .mobile-menu-btn__line:nth-child(2) {
  opacity: 0;
}

.mobile-menu-btn--active .mobile-menu-btn__line:nth-child(3) {
  transform: rotate(-45deg) translate(6px, -6px);
}

/* Mobile Navigation */
.mobile-nav {
  display: block;
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  background-color: var(--color-white);
  border-bottom: 1px solid var(--color-gray-200);
  box-shadow: var(--shadow-lg);
  transform: translateY(-100%);
  opacity: 0;
  visibility: hidden;
  transition: all var(--transition-normal);
}

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

.mobile-nav--active {
  transform: translateY(0);
  opacity: 1;
  visibility: visible;
}

.mobile-nav__list {
  list-style: none;
  padding: var(--spacing-lg);
}

.mobile-nav__item {
  border-bottom: 1px solid var(--color-gray-100);
}

.mobile-nav__item:last-child {
  border-bottom: none;
}

.mobile-nav__link {
  display: block;
  padding: var(--spacing-lg) 0;
  color: var(--color-gray-700);
  text-decoration: none;
  font-weight: var(--font-weight-medium);
  transition: color var(--transition-fast);
}

.mobile-nav__link:hover,
.mobile-nav__link--active {
  color: var(--color-primary);
}

/* Main Content */
.main {
  margin-top: var(--header-height-mobile);
}

@media (min-width: 768px) {
  .main {
    margin-top: var(--header-height);
  }
}

/* Hero Section */
.hero {
  position: relative;
  min-height: 70vh;
  display: flex;
  align-items: center;
  overflow: hidden;
}

.hero__background {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  z-index: -2;
}

.hero__image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero__overlay {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(135deg, rgba(0, 102, 204, 0.8) 0%, rgba(0, 68, 153, 0.6) 100%);
  z-index: -1;
}

.hero__content {
  position: relative;
  z-index: 1;
  color: var(--color-white);
  max-width: 600px;
}

.hero__title {
  font-size: var(--font-size-5xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
  line-height: 1.1;
}

.hero__subtitle {
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-medium);
  margin-bottom: var(--spacing-lg);
  opacity: 0.95;
}

.hero__description {
  font-size: var(--font-size-lg);
  margin-bottom: var(--spacing-3xl);
  opacity: 0.9;
  line-height: 1.6;
}

.hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-lg);
}

@media (max-width: 767px) {
  .hero__title {
    font-size: var(--font-size-4xl);
  }
  
  .hero__subtitle {
    font-size: var(--font-size-xl);
  }
  
  .hero__actions {
    flex-direction: column;
    align-items: flex-start;
  }
}

/* Quick Access Section */
.quick-access {
  padding: var(--spacing-5xl) 0;
  background-color: var(--color-gray-50);
}

.quick-access__grid {
  display: grid;
  gap: var(--spacing-2xl);
  grid-template-columns: 1fr;
}

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

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

/* Card Component */
.card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  border: 1px solid var(--color-gray-100);
}

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

.card__icon {
  width: 48px;
  height: 48px;
  background-color: var(--color-primary);
  border-radius: var(--border-radius-xl);
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: var(--spacing-lg);
  color: var(--color-white);
}

.card__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-md);
}

.card__description {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
}

.card__links {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.card__link {
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: color var(--transition-fast);
}

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

/* Features Section */
.features {
  padding: var(--spacing-5xl) 0;
}

.features__content {
  display: grid;
  gap: var(--spacing-4xl);
  align-items: center;
  grid-template-columns: 1fr;
}

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

.features__list {
  list-style: none;
  margin-top: var(--spacing-xl);
}

.features__item {
  display: flex;
  align-items: center;
  gap: var(--spacing-md);
  margin-bottom: var(--spacing-lg);
  color: var(--color-gray-700);
}

.features__item i {
  color: var(--color-success);
  width: 20px;
  height: 20px;
}

.features__image {
  position: relative;
  border-radius: var(--border-radius-xl);
  overflow: hidden;
  box-shadow: var(--shadow-xl);
}

.features__img {
  width: 100%;
  height: 400px;
  object-fit: cover;
  object-position: center;
}

/* Updates Section */
.updates {
  padding: var(--spacing-5xl) 0;
  background-color: var(--color-gray-50);
}

.updates__grid {
  display: grid;
  gap: var(--spacing-2xl);
  grid-template-columns: 1fr;
}

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

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

/* Update Card */
.update-card {
  background-color: var(--color-white);
  border-radius: var(--border-radius-xl);
  padding: var(--spacing-2xl);
  box-shadow: var(--shadow-sm);
  transition: all var(--transition-normal);
  border: 1px solid var(--color-gray-100);
}

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

.update-card__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--spacing-lg);
}

.update-card__badge {
  background-color: var(--color-accent);
  color: var(--color-white);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  padding: var(--spacing-xs) var(--spacing-sm);
  border-radius: var(--border-radius-sm);
  text-transform: uppercase;
  letter-spacing: 0.5px;
}

.update-card__date {
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.update-card__title {
  font-size: var(--font-size-lg);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
  margin-bottom: var(--spacing-md);
}

.update-card__description {
  color: var(--color-gray-600);
  margin-bottom: var(--spacing-xl);
  line-height: 1.6;
}

.update-card__link {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-sm);
  color: var(--color-primary);
  font-weight: var(--font-weight-medium);
  text-decoration: none;
  transition: all var(--transition-fast);
}

.update-card__link:hover {
  color: var(--color-primary-dark);
}

.update-card__link i {
  width: 16px;
  height: 16px;
  transition: transform var(--transition-fast);
}

.update-card__link:hover i {
  transform: translateX(4px);
}

/* Footer */
.footer {
  background-color: var(--color-gray-900);
  color: var(--color-gray-300);
  padding: var(--spacing-5xl) 0 var(--spacing-2xl);
}

.footer__content {
  display: grid;
  gap: var(--spacing-3xl);
  grid-template-columns: 1fr;
  margin-bottom: var(--spacing-4xl);
}

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

.footer__title {
  font-size: var(--font-size-xl);
  font-weight: var(--font-weight-bold);
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
}

.footer__description {
  color: var(--color-gray-400);
  line-height: 1.6;
  max-width: 300px;
}

.footer__heading {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
  color: var(--color-white);
  margin-bottom: var(--spacing-lg);
}

.footer__links {
  list-style: none;
}

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

.footer__link {
  color: var(--color-gray-400);
  text-decoration: none;
  transition: color var(--transition-fast);
}

.footer__link:hover {
  color: var(--color-white);
}

.footer__bottom {
  border-top: 1px solid var(--color-gray-700);
  padding-top: var(--spacing-2xl);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  text-align: center;
}

@media (min-width: 768px) {
  .footer__bottom {
    flex-direction: row;
    justify-content: space-between;
    text-align: left;
  }
}

.footer__copyright {
  color: var(--color-gray-400);
  font-size: var(--font-size-sm);
}

.footer__disclaimer {
  color: var(--color-gray-500);
  font-size: var(--font-size-xs);
}

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

/* Responsive Typography */
@media (max-width: 767px) {
  .section__title {
    font-size: var(--font-size-2xl);
  }
  
  .section__description {
    font-size: var(--font-size-base);
  }
}

/* Print Styles */
@media print {
  .header,
  .mobile-nav,
  .footer {
    display: none;
  }
  
  .main {
    margin-top: 0;
  }
  
  .hero {
    min-height: auto;
    padding: var(--spacing-2xl) 0;
  }
  
  .hero__background {
    display: none;
  }
  
  .hero__content {
    color: var(--color-gray-900);
  }
}

/* Dark Mode Support */
@media (prefers-color-scheme: dark) {
  /* This can be implemented later for dark mode support */
}

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

/* High Contrast Mode */
@media (prefers-contrast: high) {
  .btn--primary {
    border: 2px solid var(--color-white);
  }
  
  .card {
    border: 2px solid var(--color-gray-300);
  }
}

/* Content Pages Common Styles */
.page-header {
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-primary-dark) 100%);
  color: var(--color-white);
  padding: var(--spacing-4xl) 0 var(--spacing-3xl);
  margin-bottom: var(--spacing-4xl);
}

.page-header__title {
  font-size: var(--font-size-4xl);
  font-weight: var(--font-weight-bold);
  margin-bottom: var(--spacing-lg);
  line-height: 1.2;
}

.page-header__description {
  font-size: var(--font-size-lg);
  opacity: 0.9;
  max-width: 600px;
}

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

.content-section:not(:last-child) {
  border-bottom: 1px solid var(--color-gray-200);
}

.spec-table {
  width: 100%;
  border-collapse: collapse;
  margin: var(--spacing-2xl) 0;
  background-color: var(--color-white);
  border-radius: var(--border-radius-lg);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
}

.spec-table th,
.spec-table td {
  padding: var(--spacing-lg);
  text-align: left;
  border-bottom: 1px solid var(--color-gray-200);
}

.spec-table th {
  background-color: var(--color-gray-50);
  font-weight: var(--font-weight-semibold);
  color: var(--color-gray-900);
}

.spec-table tr:last-child td {
  border-bottom: none;
}

.spec-table tr:hover {
  background-color: var(--color-gray-50);
}

/* Breadcrumb */
.breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-xl);
  font-size: var(--font-size-sm);
  color: var(--color-gray-500);
}

.breadcrumb__link {
  color: var(--color-primary);
  text-decoration: none;
}

.breadcrumb__link:hover {
  text-decoration: underline;
}

.breadcrumb__separator {
  color: var(--color-gray-400);
}