:root {
  --main-beige: #F5F5DC;
  --dark-green: #006400;
  --accent-orange: #FFA500;
  --font-heading: 'Baskerville', serif;
  --font-body: 'Helvetica Neue', sans-serif;
  --shadow-sm: 0 4px 6px rgba(0, 0, 0, 0.1);
  --shadow-md: 0 10px 15px rgba(0, 0, 0, 0.1);
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

@font-face {
  font-family: 'Baskerville';
  src: local('Baskerville'), local('Baskerville Old Face');
}

body {
  font-family: var(--font-body);
  line-height: 1.6;
  color: #333;
  background: radial-gradient(circle at 10% 20%, rgba(245, 245, 220, 0.8), rgba(245, 245, 220, 0.4));
  margin: 0;
  padding: 0;
  min-height: 100%;
}

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

.header {
  background: linear-gradient(135deg, var(--main-beige), rgba(245, 245, 220, 0.7));
  padding: 40px 0;
  text-align: center;
  position: relative;
  overflow: hidden;
  border-bottom: 3px solid var(--dark-green);
}

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

.header h1 {
  font-family: var(--font-heading);
  color: var(--dark-green);
  font-size: 2.8rem;
  margin: 0;
  position: relative;
  z-index: 1;
  text-shadow: 2px 2px 4px rgba(0, 0, 0, 0.1);
}

.header p {
  font-size: 1.2rem;
  color: var(--dark-green);
  max-width: 800px;
  margin: 20px auto;
  position: relative;
  z-index: 1;
}

.notice {
  background: var(--dark-green);
  color: white;
  padding: 15px;
  text-align: center;
  font-size: 1rem;
  margin-bottom: 40px;
  box-shadow: var(--shadow-sm);
}

.article-container {
  display: grid;
  grid-template-columns: 250px 1fr;
  gap: 30px;
  margin: 40px 0;
}

.nav-sidebar {
  position: sticky;
  top: 20px;
  align-self: start;
  background: white;
  padding: 20px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 100, 0, 0.1);
}

.nav-sidebar h3 {
  color: var(--dark-green);
  margin-top: 0;
  border-bottom: 2px solid var(--accent-orange);
  padding-bottom: 10px;
}

.nav-sidebar ul {
  list-style: none;
  padding: 0;
  margin: 0;
}

.nav-sidebar li {
  margin-bottom: 10px;
}

.nav-sidebar a {
  color: var(--dark-green);
  text-decoration: none;
  transition: var(--transition);
  display: block;
  padding: 8px 0;
  border-bottom: 1px dashed rgba(0, 100, 0, 0.2);
}

.nav-sidebar a:hover {
  color: var(--accent-orange);
  transform: translateX(5px);
}

article {
  background: white;
  padding: 40px;
  border-radius: 8px;
  box-shadow: var(--shadow-sm);
  border: 1px solid rgba(0, 100, 0, 0.1);
}

article h2 {
  color: var(--dark-green);
  font-family: var(--font-heading);
  font-size: 2rem;
  margin-top: 0;
  border-bottom: 2px solid var(--accent-orange);
  padding-bottom: 10px;
}

article h3 {
  color: var(--dark-green);
  font-family: var(--font-heading);
  font-size: 1.5rem;
  margin-top: 30px;
}

article p {
  margin-bottom: 20px;
  font-size: 1.1rem;
  line-height: 1.7;
}

pre {
  background: #f8f8f8;
  border-left: 4px solid var(--accent-orange);
  border-radius: 4px;
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
  box-shadow: var(--shadow-sm);
}

code {
  font-family: 'Courier New', monospace;
  background: rgba(0, 100, 0, 0.05);
  padding: 2px 4px;
  border-radius: 3px;
  color: #d63384;
}

.image-gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin: 30px 0;
}

.image-card {
  position: relative;
  border-radius: 8px;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: var(--transition);
}

.image-card:hover {
  transform: translateY(-5px);
  box-shadow: var(--shadow-md);
}

.image-card img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  display: block;
}

.image-card::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background: linear-gradient(to top, rgba(0, 0, 0, 0.5), transparent);
  opacity: 0;
  transition: var(--transition);
}

.image-card:hover::after {
  opacity: 1;
}

.summary-card {
  background: linear-gradient(135deg, var(--main-beige), white);
  padding: 30px;
  border-radius: 8px;
  margin: 40px 0;
  border: 1px solid rgba(0, 100, 0, 0.2);
  box-shadow: var(--shadow-sm);
  position: relative;
  overflow: hidden;
}

.summary-card::before {
  content: "";
  position: absolute;
  top: -50%;
  left: -50%;
  width: 200%;
  height: 200%;
  background: url('https://images.gptkong.com/demo/sample2.png') center/cover no-repeat;
  opacity: 0.05;
  z-index: 0;
}

.summary-card h3 {
  position: relative;
  z-index: 1;
}

.summary-card p {
  position: relative;
  z-index: 1;
}

.footer {
  background: var(--dark-green);
  color: white;
  padding: 30px 0;
  text-align: center;
  margin-top: 60px;
}

.footer p {
  margin: 0;
}

@media (max-width: 768px) {
  .article-container {
    grid-template-columns: 1fr;
  }
  
  .nav-sidebar {
    position: static;
    margin-bottom: 30px;
  }
  
  article {
    padding: 30px 20px;
  }
  
  .header h1 {
    font-size: 2rem;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.floating {
  animation: float 3s ease-in-out infinite;
}