/* Vexon Aviation Media - Global Stylesheet */

:root {
  /* Primary Brand Colors */
  --primary-navy: #0D2137;
  --secondary-navy: #1a3a52;
  --accent-blue: #1976D2;
  --safety-red: #D32F2F;
  --warning-orange: #F57C00;
  --success-green: #388E3C;
  --neutral-gray: #424242;

  /* Neutral Palette */
  --white: #ffffff;
  --light-gray: #f5f5f5;
  --medium-gray: #e0e0e0;
  --dark-gray: #666666;

  /* Typography */
  --font-sans: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Inter', Roboto, Helvetica, Arial, sans-serif;
  --font-mono: 'IBM Plex Mono', 'Courier New', monospace;

  /* Spacing */
  --spacing-xs: 0.5rem;
  --spacing-sm: 1rem;
  --spacing-md: 1.5rem;
  --spacing-lg: 2rem;
  --spacing-xl: 3rem;
  --spacing-2xl: 5rem;

  /* Border Radius */
  --radius-sm: 4px;
  --radius-md: 8px;

  /* Shadows */
  --shadow-sm: 0 2px 8px rgba(0, 0, 0, 0.08);
  --shadow-md: 0 4px 16px rgba(0, 0, 0, 0.12);
  --shadow-lg: 0 8px 24px rgba(0, 0, 0, 0.15);
}

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

html {
  scroll-behavior: smooth;
}

body {
  font-family: var(--font-sans);
  font-size: 16px;
  line-height: 1.6;
  color: var(--neutral-gray);
  background-color: var(--white);
}

h1, h2, h3, h4, h5, h6 {
  font-weight: 700;
  line-height: 1.2;
  color: var(--primary-navy);
}

h1 {
  font-size: 2rem;
  margin-bottom: var(--spacing-md);
}

h2 {
  font-size: 1.5rem;
  margin-bottom: var(--spacing-md);
}

h3 {
  font-size: 1.25rem;
  margin-bottom: var(--spacing-sm);
}

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

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

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

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

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

.container-narrow {
  max-width: 800px;
  margin: 0 auto;
  padding: 0 var(--spacing-lg);
}

/* Header & Navigation */
header {
  background-color: var(--primary-navy);
  color: var(--white);
  padding: var(--spacing-md) 0;
  position: sticky;
  top: 0;
  z-index: 1000;
  box-shadow: var(--shadow-sm);
}

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

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: 0.5px;
  color: var(--white);
}

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

nav a {
  color: var(--white);
  font-size: 0.95rem;
  font-weight: 500;
  transition: opacity 0.3s ease;
}

nav a:hover {
  opacity: 0.8;
  color: var(--white);
}

.menu-toggle {
  display: none;
  background: none;
  border: none;
  color: var(--white);
  font-size: 1.5rem;
  cursor: pointer;
}

/* Hero Section */
.hero {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--secondary-navy) 100%);
  color: var(--white);
  padding: 5rem var(--spacing-lg);
  text-align: center;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 1200 600"><defs><pattern id="grid" width="40" height="40" patternUnits="userSpaceOnUse"><path d="M 40 0 L 0 0 0 40" fill="none" stroke="rgba(255,255,255,0.03)" stroke-width="1"/></pattern></defs><rect width="1200" height="600" fill="url(%23grid)"/></svg>');
  pointer-events: none;
  z-index: 1;
}

.hero-content {
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 2;
  animation: fadeInUp 0.8s ease-out;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
  color: var(--white);
  line-height: 1.2;
}

.hero-subtitle {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-md);
  opacity: 0.95;
  font-weight: 500;
}

.hero-tagline {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-lg);
  opacity: 0.9;
  font-style: italic;
  padding: var(--spacing-sm) 0;
  border-top: 1px solid rgba(255, 255, 255, 0.3);
  border-bottom: 1px solid rgba(255, 255, 255, 0.3);
  display: inline-block;
}

.cta-group {
  display: flex;
  gap: var(--spacing-md);
  justify-content: center;
  flex-wrap: wrap;
  margin-top: var(--spacing-lg);
}

/* Buttons */
.btn {
  display: inline-block;
  padding: 1rem 2rem;
  font-size: 1rem;
  font-weight: 600;
  border: none;
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: all 0.3s ease;
  text-decoration: none;
  text-align: center;
  white-space: nowrap;
}

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

.btn-primary:hover {
  background-color: #1565c0;
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

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

.btn-secondary:hover {
  background-color: rgba(255, 255, 255, 0.1);
  transform: translateY(-2px);
}

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

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

.btn-small {
  padding: 0.75rem 1.5rem;
  font-size: 0.95rem;
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-md);
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 600;
  color: var(--primary-navy);
}

input[type="email"],
input[type="text"],
input[type="tel"],
textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--medium-gray);
  border-radius: var(--radius-sm);
  font-family: var(--font-sans);
  font-size: 1rem;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

input[type="email"]:focus,
input[type="text"]:focus,
input[type="tel"]:focus,
textarea:focus {
  outline: none;
  border-color: var(--accent-blue);
  box-shadow: 0 0 0 3px rgba(25, 118, 210, 0.1);
}

textarea {
  resize: vertical;
  min-height: 150px;
}

.form-horizontal {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
}

.form-horizontal input {
  flex: 1;
  min-width: 250px;
}

.form-horizontal button {
  flex-shrink: 0;
}

/* Section Styles */
section {
  padding: var(--spacing-2xl) var(--spacing-lg);
}

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

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

.section-title {
  font-size: 2.5rem;
  margin-bottom: var(--spacing-md);
}

.section-subtitle {
  font-size: 1.1rem;
  color: var(--dark-gray);
  max-width: 600px;
  margin: 0 auto;
}

/* Article Cards */
.article-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.article-card {
  background: var(--white);
  border-radius: var(--radius-md);
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: all 0.3s ease;
  display: flex;
  flex-direction: column;
}

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

.article-card-image {
  width: 100%;
  height: 200px;
  background: linear-gradient(135deg, var(--accent-blue) 0%, var(--primary-navy) 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 3rem;
  color: var(--white);
}

.article-card-content {
  padding: var(--spacing-lg);
  flex: 1;
  display: flex;
  flex-direction: column;
}

.article-category {
  display: inline-block;
  background-color: var(--accent-blue);
  color: var(--white);
  padding: 0.3rem 0.8rem;
  border-radius: 20px;
  font-size: 0.8rem;
  font-weight: 600;
  margin-bottom: var(--spacing-md);
  width: fit-content;
}

.article-title {
  font-size: 1.3rem;
  margin-bottom: var(--spacing-sm);
  line-height: 1.4;
}

.article-meta {
  font-size: 0.9rem;
  color: var(--dark-gray);
  margin-bottom: var(--spacing-md);
}

.article-excerpt {
  font-size: 0.95rem;
  line-height: 1.6;
  margin-bottom: var(--spacing-md);
  flex-grow: 1;
}

.article-link {
  color: var(--accent-blue);
  font-weight: 600;
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.article-link:hover {
  color: var(--primary-navy);
}

/* Featured Article */
.featured-article {
  background-color: var(--light-gray);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  border-left: 4px solid var(--accent-blue);
  margin-bottom: var(--spacing-lg);
}

.featured-article h3 {
  margin-top: 0;
}

/* Category Grid */
.category-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-top: var(--spacing-lg);
}

.category-card {
  background: var(--white);
  border: 2px solid var(--medium-gray);
  border-radius: var(--radius-md);
  padding: var(--spacing-lg);
  text-align: center;
  transition: all 0.3s ease;
}

.category-card:hover {
  border-color: var(--accent-blue);
  box-shadow: var(--shadow-md);
  transform: translateY(-2px);
}

.category-icon {
  font-size: 3rem;
  margin-bottom: var(--spacing-md);
}

.category-name {
  font-size: 1.3rem;
  font-weight: 600;
  margin-bottom: var(--spacing-sm);
  color: var(--primary-navy);
}

.category-description {
  color: var(--dark-gray);
  font-size: 0.95rem;
  line-height: 1.6;
}

/* Article Page Layout */
.article-full {
  display: grid;
  grid-template-columns: 1fr 320px;
  gap: var(--spacing-lg);
  align-items: start;
}

.article-main {
  background: var(--white);
}

.article-header {
  margin-bottom: var(--spacing-lg);
  padding-bottom: var(--spacing-lg);
  border-bottom: 1px solid var(--medium-gray);
}

.article-byline {
  font-size: 0.95rem;
  color: var(--dark-gray);
  margin: var(--spacing-sm) 0;
}

.article-content {
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--neutral-gray);
}

.article-content h2 {
  margin-top: var(--spacing-xl);
  margin-bottom: var(--spacing-md);
}

.article-content h3 {
  margin-top: var(--spacing-lg);
  margin-bottom: var(--spacing-sm);
}

.article-content ol,
.article-content ul {
  margin: var(--spacing-md) 0 var(--spacing-md) var(--spacing-lg);
}

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

.article-content blockquote {
  border-left: 4px solid var(--accent-blue);
  padding-left: var(--spacing-lg);
  margin: var(--spacing-lg) 0;
  font-style: italic;
  color: var(--dark-gray);
}

.article-content code {
  background-color: var(--light-gray);
  padding: 0.25rem 0.5rem;
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: 0.9rem;
}

.article-content pre {
  background-color: var(--light-gray);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  overflow-x: auto;
  margin: var(--spacing-md) 0;
}

.article-content pre code {
  background: none;
  padding: 0;
}

/* Sidebar */
.sidebar {
  position: sticky;
  top: 100px;
}

.sidebar-widget {
  background: var(--light-gray);
  padding: var(--spacing-lg);
  border-radius: var(--radius-md);
  margin-bottom: var(--spacing-lg);
}

.sidebar-widget h3 {
  margin-top: 0;
  font-size: 1.1rem;
}

.related-articles {
  list-style: none;
}

.related-articles li {
  padding: var(--spacing-sm) 0;
  border-bottom: 1px solid var(--medium-gray);
}

.related-articles li:last-child {
  border-bottom: none;
}

.related-articles a {
  display: block;
  font-weight: 500;
}

.social-share {
  display: flex;
  gap: var(--spacing-sm);
}

.social-share a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: var(--accent-blue);
  color: var(--white);
  border-radius: 50%;
  font-size: 1.1rem;
}

.social-share a:hover {
  background-color: var(--primary-navy);
  color: var(--white);
}

/* Newsletter Section */
.newsletter-section {
  background: linear-gradient(135deg, var(--primary-navy) 0%, var(--secondary-navy) 100%);
  color: var(--white);
  text-align: center;
  padding: var(--spacing-2xl) var(--spacing-lg);
}

.newsletter-content {
  max-width: 600px;
  margin: 0 auto;
}

.newsletter-section h2 {
  color: var(--white);
}

.newsletter-section p {
  color: rgba(255, 255, 255, 0.95);
  margin-bottom: var(--spacing-lg);
}

.newsletter-form {
  display: flex;
  gap: var(--spacing-sm);
  flex-wrap: wrap;
  justify-content: center;
}

.newsletter-form input {
  flex: 1;
  min-width: 250px;
  padding: var(--spacing-sm);
  border: none;
  border-radius: var(--radius-sm);
  font-size: 1rem;
}

.newsletter-form button {
  padding: var(--spacing-sm) var(--spacing-lg);
  background-color: var(--accent-blue);
  color: var(--white);
  border: none;
  border-radius: var(--radius-sm);
  font-weight: 600;
  cursor: pointer;
  transition: all 0.3s ease;
}

.newsletter-form button:hover {
  background-color: #1565c0;
  transform: translateY(-2px);
}

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

.footer-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: var(--spacing-lg);
  margin-bottom: var(--spacing-lg);
}

.footer-section h3 {
  font-size: 1.1rem;
  margin-bottom: var(--spacing-md);
  color: var(--white);
}

.footer-section p {
  font-size: 0.95rem;
  opacity: 0.9;
  line-height: 1.6;
}

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

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

.footer-links a {
  color: var(--white);
  font-size: 0.95rem;
  opacity: 0.9;
  transition: opacity 0.3s ease;
}

.footer-links a:hover {
  opacity: 1;
  color: var(--white);
}

.social-links {
  display: flex;
  gap: var(--spacing-md);
  margin-top: var(--spacing-md);
}

.social-links a {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  background-color: rgba(255, 255, 255, 0.1);
  color: var(--white);
  border-radius: 50%;
  transition: all 0.3s ease;
  font-size: 1.1rem;
}

.social-links a:hover {
  background-color: var(--accent-blue);
  transform: translateY(-2px);
}

.footer-divider {
  border-top: 1px solid rgba(255, 255, 255, 0.1);
  padding-top: var(--spacing-lg);
  margin-top: var(--spacing-lg);
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex-wrap: wrap;
  gap: var(--spacing-md);
  font-size: 0.9rem;
  opacity: 0.8;
}

/* Utilities */
.text-center {
  text-align: center;
}

.text-muted {
  color: var(--dark-gray);
}

.mt-1 { margin-top: var(--spacing-sm); }
.mt-2 { margin-top: var(--spacing-md); }
.mt-3 { margin-top: var(--spacing-lg); }

.mb-1 { margin-bottom: var(--spacing-sm); }
.mb-2 { margin-bottom: var(--spacing-md); }
.mb-3 { margin-bottom: var(--spacing-lg); }

.pt-1 { padding-top: var(--spacing-sm); }
.pt-2 { padding-top: var(--spacing-md); }
.pt-3 { padding-top: var(--spacing-lg); }

.pb-1 { padding-bottom: var(--spacing-sm); }
.pb-2 { padding-bottom: var(--spacing-md); }
.pb-3 { padding-bottom: var(--spacing-lg); }

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

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

/* Responsive Design */
@media (max-width: 768px) {
  .header-container {
    flex-direction: column;
    gap: var(--spacing-md);
  }

  nav ul {
    gap: var(--spacing-md);
    justify-content: center;
  }

  nav a {
    font-size: 0.9rem;
  }

  .hero {
    padding: 3rem var(--spacing-lg);
  }

  .hero h1 {
    font-size: 2rem;
  }

  .hero-subtitle {
    font-size: 1.1rem;
  }

  section {
    padding: var(--spacing-lg) var(--spacing-lg);
  }

  .section-title {
    font-size: 2rem;
  }

  .cta-group {
    flex-direction: column;
    align-items: center;
  }

  .btn {
    width: 100%;
    max-width: 300px;
  }

  .form-horizontal {
    flex-direction: column;
  }

  .form-horizontal input,
  .form-horizontal button {
    width: 100%;
  }

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

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

  .article-full {
    grid-template-columns: 1fr;
  }

  .sidebar {
    position: static;
  }

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

  .footer-divider {
    flex-direction: column;
    text-align: center;
  }

  .newsletter-form {
    flex-direction: column;
  }

  .newsletter-form input,
  .newsletter-form button {
    width: 100%;
  }
}

@media (max-width: 480px) {
  .container,
  .container-narrow {
    padding: 0 var(--spacing-sm);
  }

  .hero h1 {
    font-size: 1.5rem;
  }

  .section-title {
    font-size: 1.5rem;
  }

  nav ul {
    gap: var(--spacing-sm);
  }

  .article-title {
    font-size: 1.1rem;
  }

  .btn {
    padding: 0.8rem 1.5rem;
    font-size: 0.95rem;
  }
}

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

/* Print Styles */
@media print {
  header,
  footer,
  .sidebar,
  .newsletter-section,
  .cta-group {
    display: none;
  }

  body {
    font-size: 12pt;
    line-height: 1.5;
    color: #000;
  }

  a {
    color: #000;
    text-decoration: underline;
  }
}