:root {
  --primary-color: #032B44;
  --secondary-color: #87CEEB;
  --accent-color: #FF9F1C;
  --background-color: #F5F5F5;
  --text-color: #333333;
  --light-gray: #E8E8E8;
  --dark-gray: #4A4A4A;
}

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

body {
  font-family: 'Helvetica Neue', Helvetica, Arial, sans-serif;
  line-height: 1.6;
  color: var(--text-color);
  background-color: var(--background-color);
  overflow-x: hidden;
}

/* Header Styles */
.header {
  background: linear-gradient(135deg, var(--primary-color) 0%, #0A4B75 100%);
  color: white;
  padding: 2rem 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
}

.header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--accent-color), var(--secondary-color), var(--accent-color);
}

.header h1 {
  font-size: 2.5rem;
  margin-bottom: 1rem;
  position: relative;
  z-index: 1;
  text-shadow: 0 2px 4px rgba(0,0,0,0.2);
}

.header p {
  font-size: 1.1rem;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}

/* Navigation */
.nav-container {
  background-color: white;
  box-shadow: 0 2px 10px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 1000;
}

.nav {
  display: flex;
  justify-content: space-between;
  align-items: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 1rem 2rem;
}

.nav-logo {
  font-weight: bold;
  font-size: 1.2rem;
  color: var(--primary-color);
  text-decoration: none;
}

.nav-links {
  display: flex;
  list-style: none;
}

.nav-links li {
  margin-left: 2rem;
}

.nav-links a {
  color: var(--primary-color);
  text-decoration: none;
  font-weight: 500;
  transition: color 0.3s ease;
  position: relative;
}

.nav-links a:hover {
  color: var(--accent-color);
}

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

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

.hamburger {
  display: none;
  cursor: pointer;
}

.hamburger div {
  width: 25px;
  height: 3px;
  background-color: var(--primary-color);
  margin: 5px;
  transition: all 0.3s ease;
}

/* Main Content */
.main {
  max-width: 1200px;
  margin: 2rem auto;
  padding: 0 2rem;
}

.article-container {
  background-color: white;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  padding: 2rem;
  margin-bottom: 2rem;
}

.article-header {
  margin-bottom: 2rem;
  text-align: center;
}

.article-header h2 {
  font-size: 2rem;
  color: var(--primary-color);
  margin-bottom: 1rem;
  position: relative;
  display: inline-block;
}

.article-header h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color), var(--secondary-color));
}

.section {
  margin-bottom: 3rem;
}

.section h3 {
  font-size: 1.5rem;
  color: var(--primary-color);
  margin-bottom: 1.5rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px solid var(--light-gray);
}

.section p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
  line-height: 1.8;
}

.section span {
  color: var(--accent-color);
  font-weight: 500;
}

.section strong {
  color: var(--primary-color);
}

.section em {
  font-style: italic;
  color: var(--dark-gray);
}

/* Code Blocks */
pre {
  background-color: #f8f8f8;
  border-radius: 6px;
  padding: 1.5rem;
  overflow: auto;
  margin: 1.5rem 0;
  border-left: 4px solid var(--secondary-color);
  position: relative;
}

pre code {
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #333;
}

pre::before {
  content: 'CSS';
  position: absolute;
  top: 0;
  right: 0;
  background-color: var(--secondary-color);
  color: white;
  padding: 0.2rem 0.8rem;
  font-size: 0.8rem;
  border-bottom-left-radius: 4px;
}

/* Image Gallery */
.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 1.5rem;
  margin: 2rem 0;
}

.gallery-item {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.gallery-item:hover {
  transform: translateY(-5px);
  box-shadow: 0 8px 16px rgba(0,0,0,0.15);
}

.gallery-item img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.5s ease;
}

.gallery-item:hover img {
  transform: scale(1.05);
}

/* Footer */
.footer {
  background: linear-gradient(135deg, var(--primary-color) 0%, #0A4B75 100%);
  color: white;
  padding: 3rem 0;
  text-align: center;
}

.footer-content {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 2rem;
}

.footer p {
  margin-bottom: 1rem;
}

.footer-links {
  display: flex;
  justify-content: center;
  list-style: none;
  margin: 1.5rem 0;
}

.footer-links li {
  margin: 0 1rem;
}

.footer-links a {
  color: white;
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.copyright {
  font-size: 0.9rem;
  opacity: 0.8;
}

/* Animations */
@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.8s ease forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }

/* Responsive Design */
@media (max-width: 768px) {
  .nav-links {
    position: fixed;
    top: 70px;
    left: -100%;
    width: 100%;
    height: calc(100vh - 70px);
    background-color: white;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    padding-top: 2rem;
    transition: left 0.3s ease;
  }

  .nav-links.active {
    left: 0;
  }

  .nav-links li {
    margin: 1rem 0;
  }

  .hamburger {
    display: block;
  }

  .hamburger.active div:nth-child(1) {
    transform: rotate(-45deg) translate(-5px, 6px);
  }

  .hamburger.active div:nth-child(2) {
    opacity: 0;
  }

  .hamburger.active div:nth-child(3) {
    transform: rotate(45deg) translate(-5px, -6px);
  }

  .image-gallery {
    grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  }
}

@media (max-width: 480px) {
  .header h1 {
    font-size: 2rem;
  }

  .article-header h2 {
    font-size: 1.5rem;
  }

  .section h3 {
    font-size: 1.3rem;
  }

  .image-gallery {
    grid-template-columns: 1fr;
  }
}

/* Utility Classes */
.text-center {
  text-align: center;
}

.mb-1 { margin-bottom: 1rem; }
.mb-2 { margin-bottom: 2rem; }
.mb-3 { margin-bottom: 3rem; }

.p-1 { padding: 1rem; }
.p-2 { padding: 2rem; }

.rounded {
  border-radius: 8px;
}

.shadow {
  box-shadow: 0 4px 8px rgba(0,0,0,0.1);
}

/* Decorative Elements */
.decorative-line {
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--secondary-color), transparent);
  margin: 2rem 0;
}

.decorative-dots {
  display: flex;
  justify-content: center;
  margin: 1.5rem 0;
}

.dot {
  width: 8px;
  height: 8px;
  background-color: var(--secondary-color);
  border-radius: 50%;
  margin: 0 5px;
  opacity: 0.6;
}

/* Notification Banner */
.notification {
  background-color: var(--accent-color);
  color: white;
  padding: 1rem;
  text-align: center;
  font-weight: bold;
  position: fixed;
  bottom: 0;
  left: 0;
  right: 0;
  z-index: 1001;
  transform: translateY(100%);
  transition: transform 0.3s ease;
}

.notification.show {
  transform: translateY(0);
}