:root {
  --primary-color: #003366;
  --secondary-color: #2d3748;
  --accent-color: #FFA500;
  --bg-gradient: linear-gradient(135deg, #003366 0%, #2d3748 100%);
  --text-light: #f8f9fa;
  --text-dark: #212529;
  --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
}

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

body {
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  color: var(--text-dark);
  background-color: #f5f7fa;
  overflow-x: hidden;
}

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

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  z-index: 1000;
  background: var(--bg-gradient);
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
  padding: 15px 0;
}

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

.nav-logo {
  font-size: 24px;
  font-weight: 700;
  color: var(--text-light);
  text-decoration: none;
  display: flex;
  align-items: center;
}

.nav-logo img {
  width: 40px;
  height: 40px;
  margin-right: 10px;
  border-radius: 50%;
}

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

.nav-item {
  margin-left: 30px;
}

.nav-link {
  color: var(--text-light);
  text-decoration: none;
  font-size: 16px;
  font-weight: 500;
  transition: var(--transition);
  position: relative;
}

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

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

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

.hero {
  padding: 150px 0 80px;
  background: var(--bg-gradient);
  color: var(--text-light);
  text-align: center;
  position: relative;
  overflow: hidden;
}

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

.hero-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  margin: 0 auto;
}

.hero-title {
  font-size: 48px;
  font-weight: 700;
  margin-bottom: 20px;
  text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.hero-subtitle {
  font-size: 20px;
  margin-bottom: 30px;
  opacity: 0.9;
}

.notice {
  background-color: rgba(255, 255, 255, 0.1);
  padding: 15px;
  border-radius: 8px;
  margin: 30px 0;
  font-size: 14px;
  border-left: 4px solid var(--accent-color);
}

.main {
  padding: 60px 0;
}

.section {
  margin-bottom: 60px;
  background-color: white;
  border-radius: 12px;
  padding: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  position: relative;
  overflow: hidden;
}

.section::after {
  content: '';
  position: absolute;
  top: 0;
  right: 0;
  width: 100px;
  height: 100px;
  background: url('https://images.gptkong.com/demo/sample2.png') no-repeat center/contain;
  opacity: 0.1;
  z-index: 0;
}

.section-title {
  font-size: 32px;
  color: var(--primary-color);
  margin-bottom: 30px;
  position: relative;
  z-index: 1;
}

.section-title::after {
  content: '';
  display: block;
  width: 60px;
  height: 4px;
  background: var(--accent-color);
  margin-top: 10px;
}

.section-subtitle {
  font-size: 24px;
  color: var(--secondary-color);
  margin: 30px 0 20px;
  position: relative;
  z-index: 1;
}

.section-text {
  margin-bottom: 20px;
  position: relative;
  z-index: 1;
}

.code-container {
  background-color: #1e1e1e;
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow: auto;
  position: relative;
  z-index: 1;
}

.code-container pre {
  margin: 0;
}

.code-container code {
  font-family: 'Courier New', monospace;
  color: #d4d4d4;
  font-size: 14px;
  line-height: 1.5;
}

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

.image-card {
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: var(--transition);
  position: relative;
}

.image-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.image-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  display: block;
}

.image-caption {
  padding: 15px;
  background-color: white;
}

.footer {
  background: var(--bg-gradient);
  color: var(--text-light);
  padding: 40px 0;
  text-align: center;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  margin: 20px 0;
}

.footer-link {
  color: var(--text-light);
  margin: 0 15px;
  text-decoration: none;
  transition: var(--transition);
}

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

@media (max-width: 768px) {
  .hero-title {
    font-size: 36px;
  }
  
  .hero-subtitle {
    font-size: 18px;
  }
  
  .section {
    padding: 30px;
  }
  
  .section-title {
    font-size: 28px;
  }
  
  .nav-menu {
    display: none;
  }
}

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

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