:root {
  --primary: #032B44;
  --secondary: #FFA500;
  --light: #FFFFFF;
  --gray: #F5F5F5;
  --dark: #121212;
  --accent: #6E48AA;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Roboto', sans-serif;
}

body {
  background-color: var(--gray);
  color: var(--dark);
  line-height: 1.6;
  overflow-x: hidden;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

header {
  background: linear-gradient(135deg, var(--primary) 0%, #02192b 100%);
  padding: 2rem 0;
  position: relative;
  overflow: hidden;
}

header::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  opacity: 0.1;
  z-index: 0;
}

.header-content {
  position: relative;
  z-index: 1;
  text-align: center;
  color: var(--light);
  padding: 4rem 0;
}

.header-content h1 {
  font-size: 3rem;
  margin-bottom: 1.5rem;
  text-shadow: 0 2px 10px rgba(0,0,0,0.3);
}

.header-content p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 2rem;
}

.navbar {
  position: sticky;
  top: 0;
  background: rgba(3, 43, 68, 0.95);
  padding: 1rem 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0,0,0,0.1);
}

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

.nav-links {
  display: flex;
  gap: 2rem;
}

.nav-links a {
  color: var(--light);
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
  position: relative;
  padding: 0.5rem 0;
}

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

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

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

.notice {
  background: var(--secondary);
  color: var(--dark);
  padding: 1rem;
  text-align: center;
  font-weight: bold;
  margin-bottom: 2rem;
}

.main-content {
  padding: 4rem 0;
}

.article-container {
  background: var(--light);
  border-radius: 12px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.05);
  padding: 3rem;
  margin-bottom: 3rem;
}

article h2 {
  color: var(--primary);
  font-size: 2.2rem;
  margin-bottom: 2rem;
  position: relative;
  padding-bottom: 1rem;
}

article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 4px;
  background: var(--secondary);
  border-radius: 2px;
}

article h3 {
  color: var(--primary);
  font-size: 1.8rem;
  margin: 2.5rem 0 1.5rem;
}

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

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.image-card {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.15);
}

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

.image-card:hover img {
  transform: scale(1.05);
}

pre {
  background: #f8f8f8;
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
  overflow-x: auto;
  border-left: 4px solid var(--secondary);
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  line-height: 1.5;
}

code {
  background: rgba(255, 165, 0, 0.1);
  padding: 0.2rem 0.4rem;
  border-radius: 4px;
  font-family: 'Courier New', monospace;
  font-size: 0.95rem;
  color: #d63384;
}

.feature-section {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.feature-card {
  background: var(--light);
  border-radius: 12px;
  padding: 2rem;
  box-shadow: 0 5px 15px rgba(0,0,0,0.05);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  border-top: 4px solid var(--secondary);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,0,0,0.1);
}

.feature-card h4 {
  color: var(--primary);
  font-size: 1.4rem;
  margin-bottom: 1rem;
}

.feature-card p {
  color: #555;
}

footer {
  background: var(--primary);
  color: var(--light);
  padding: 3rem 0;
  text-align: center;
}

.footer-content {
  max-width: 800px;
  margin: 0 auto;
}

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin: 2rem 0;
}

.footer-links a {
  color: var(--light);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.copyright {
  margin-top: 2rem;
  opacity: 0.8;
}

@media (max-width: 768px) {
  .header-content h1 {
    font-size: 2.2rem;
  }
  
  .nav-links {
    gap: 1rem;
  }
  
  .article-container {
    padding: 2rem;
  }
  
  article h2 {
    font-size: 1.8rem;
  }
  
  article h3 {
    font-size: 1.5rem;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-20px);
  }
}

.floating {
  animation: float 6s ease-in-out infinite;
}