:root {
  --primary-color: #00aaff;
  --secondary-color: #c0c0c0;
  --accent-color-1: #9b59b6;
  --accent-color-2: #1abc9c;
  --dark-bg: #001f3f;
  --darker-bg: #2c3e50;
  --text-color: #f8f9fa;
}

body {
  margin: 0;
  font-family: 'Roboto', sans-serif;
  background: linear-gradient(180deg, var(--dark-bg), var(--darker-bg));
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

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

.header {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  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: 0.3;
  z-index: -1;
}

.header-content {
  text-align: center;
  padding: 40px;
  background: rgba(0, 31, 63, 0.7);
  border-radius: 20px;
  backdrop-filter: blur(10px);
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.5);
  max-width: 800px;
  margin: 0 auto;
}

.header h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  background: linear-gradient(45deg, var(--primary-color), var(--accent-color-2));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  animation: titleGlow 3s ease-in-out infinite alternate;
}

@keyframes titleGlow {
  from {
    text-shadow: 0 0 10px rgba(0, 170, 255, 0.5);
  }
  to {
    text-shadow: 0 0 20px rgba(0, 170, 255, 0.8), 0 0 30px rgba(155, 89, 182, 0.6);
  }
}

.notice {
  position: fixed;
  top: 20px;
  right: 20px;
  background: rgba(0, 0, 0, 0.7);
  color: white;
  padding: 10px 20px;
  border-radius: 5px;
  z-index: 1000;
  font-size: 14px;
  backdrop-filter: blur(5px);
}

.main-content {
  padding: 80px 0;
}

.section {
  margin-bottom: 100px;
  padding: 40px;
  background: rgba(0, 31, 63, 0.2);
  border-radius: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.section:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.section h2, .section h3 {
  color: var(--accent-color-1);
  position: relative;
  padding-bottom: 10px;
  margin-bottom: 30px;
}

.section h2::after, .section h3::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color-1), var(--accent-color-2));
}

.code-block {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  padding: 20px;
  margin: 30px 0;
  overflow: auto;
  border-left: 4px solid var(--accent-color-2);
}

.code-block pre {
  margin: 0;
  font-family: 'Courier New', monospace;
  font-size: 14px;
  line-height: 1.5;
  color: #f8f9fa;
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 30px;
  margin: 40px 0;
}

.image-card {
  position: relative;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}

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

.image-card img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  transition: transform 0.5s ease;
}

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

.image-card::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(45deg, rgba(0, 170, 255, 0.3), rgba(155, 89, 182, 0.3));
  opacity: 0;
  transition: opacity 0.3s ease;
}

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

.nav-tabs {
  display: flex;
  margin-bottom: 30px;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

.nav-tab {
  padding: 15px 30px;
  cursor: pointer;
  position: relative;
  color: var(--secondary-color);
  transition: all 0.3s ease;
}

.nav-tab:hover {
  color: white;
}

.nav-tab.active {
  color: var(--accent-color-1);
}

.nav-tab.active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color-1), var(--accent-color-2));
}

.footer {
  text-align: center;
  padding: 40px 0;
  background: rgba(0, 0, 0, 0.2);
  margin-top: 80px;
}

@media (max-width: 768px) {
  .header {
    height: 500px;
  }
  
  .header h1 {
    font-size: 2.5rem;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
  
  .section {
    padding: 30px 20px;
  }
}

@media (max-width: 480px) {
  .header {
    height: 400px;
  }
  
  .header h1 {
    font-size: 2rem;
  }
  
  .section {
    padding: 20px 15px;
  }
  
  .nav-tabs {
    flex-direction: column;
  }
  
  .nav-tab {
    padding: 10px 15px;
  }
}