:root {
  --primary-green: #81C784;
  --secondary-brown: #A1887F;
  --accent-blue: #2196F3;
  --neutral-gray: #ECEFF1;
  --highlight-orange: #FFC107;
  --dark-gray: #263238;
  --light-gray: #f5f7fa;
  --text-dark: #37474F;
  --text-light: #607D8B;
}

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

body {
  font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: var(--light-gray);
  overflow-x: hidden;
}

.header {
  position: fixed;
  top: 0;
  width: 100%;
  height: 80px;
  background: linear-gradient(135deg, var(--primary-green), var(--accent-blue));
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  z-index: 1000;
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 5%;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  color: white;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
}

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

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  padding: 0.5rem 1rem;
  border-radius: 4px;
  transition: all 0.3s ease;
}

.nav-links a:hover {
  background-color: rgba(255, 255, 255, 0.2);
  transform: translateY(-2px);
}

.container {
  max-width: 1200px;
  margin: 100px auto 50px;
  padding: 0 20px;
}

.hero {
  height: 500px;
  background: linear-gradient(rgba(0, 0, 0, 0.5), rgba(0, 0, 0, 0.5)), url('https://images.gptkong.com/demo/sample1.png');
  background-size: cover;
  background-position: center;
  border-radius: 16px;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-bottom: 60px;
  position: relative;
  overflow: hidden;
}

.hero::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, rgba(129, 199, 132, 0.3), rgba(33, 150, 243, 0.3));
  animation: gradientShift 15s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.hero-content {
  text-align: center;
  color: white;
  z-index: 1;
  padding: 0 20px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero p {
  font-size: 1.2rem;
  max-width: 700px;
  margin: 0 auto 30px;
}

.button {
  display: inline-block;
  background-color: var(--highlight-orange);
  color: white;
  padding: 12px 30px;
  border-radius: 30px;
  text-decoration: none;
  font-weight: 600;
  transition: all 0.3s ease;
  box-shadow: 0 4px 8px rgba(0, 0, 0, 0.2);
}

.button:hover {
  transform: translateY(-3px);
  box-shadow: 0 6px 12px rgba(0, 0, 0, 0.3);
}

.section-title {
  text-align: center;
  margin-bottom: 60px;
  position: relative;
}

.section-title h2 {
  font-size: 2.5rem;
  color: var(--primary-green);
  display: inline-block;
  padding-bottom: 15px;
}

.section-title h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 50%;
  transform: translateX(-50%);
  width: 100px;
  height: 4px;
  background: linear-gradient(to right, var(--primary-green), var(--accent-blue));
  border-radius: 2px;
}

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin-bottom: 80px;
}

.feature-card {
  background-color: white;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.15);
}

.feature-img {
  height: 200px;
  overflow: hidden;
}

.feature-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 0.5s ease;
}

.feature-card:hover .feature-img img {
  transform: scale(1.1);
}

.feature-content {
  padding: 25px;
}

.feature-content h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--dark-gray);
}

.feature-content p {
  color: var(--text-light);
  margin-bottom: 20px;
}

.article-container {
  background-color: white;
  border-radius: 16px;
  padding: 40px;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.1);
  margin-bottom: 80px;
}

article h2 {
  font-size: 2rem;
  color: var(--primary-green);
  margin-bottom: 30px;
  padding-bottom: 15px;
  border-bottom: 2px solid var(--neutral-gray);
}

article h3 {
  font-size: 1.5rem;
  color: var(--accent-blue);
  margin: 40px 0 20px;
}

article p {
  margin-bottom: 20px;
  font-size: 1.1rem;
  line-height: 1.8;
}

pre {
  background-color: var(--dark-gray);
  color: white;
  padding: 20px;
  border-radius: 8px;
  overflow-x: auto;
  margin: 25px 0;
  font-size: 0.9rem;
  line-height: 1.5;
}

code {
  font-family: 'Courier New', Courier, monospace;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
}

thead {
  background-color: var(--primary-green);
  color: white;
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid var(--neutral-gray);
}

tbody tr:nth-child(even) {
  background-color: var(--light-gray);
}

tbody tr:hover {
  background-color: rgba(129, 199, 132, 0.1);
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 20px;
  margin: 40px 0;
}

.gallery-item {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.gallery-item:hover {
  transform: scale(1.03);
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.2);
}

.gallery-item img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

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

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: 30px;
  margin-bottom: 30px;
}

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

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

.copyright {
  margin-top: 30px;
  color: var(--text-light);
  font-size: 0.9rem;
}

.notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background-color: white;
  padding: 15px 20px;
  border-radius: 8px;
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.2);
  z-index: 1000;
  animation: slideIn 0.5s ease-out;
}

@keyframes slideIn {
  from {
    transform: translateX(100%);
    opacity: 0;
  }
  to {
    transform: translateX(0);
    opacity: 1;
  }
}

@media (max-width: 768px) {
  .header {
    padding: 0 20px;
  }
  
  .nav-links {
    display: none;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .hero p {
    font-size: 1rem;
  }
  
  .features {
    grid-template-columns: 1fr;
  }
  
  .article-container {
    padding: 20px;
  }
  
  article h2 {
    font-size: 1.8rem;
  }
  
  article h3 {
    font-size: 1.3rem;
  }
}

@media (max-width: 480px) {
  .hero {
    height: 400px;
  }
  
  .section-title h2 {
    font-size: 2rem;
  }
  
  .gallery {
    grid-template-columns: 1fr;
  }
}