:root {
  --primary: #1A237E;
  --secondary: #03A9F4;
  --accent: #BA68C8;
  --text: #FFFFFF;
  --dark: #0D47A1;
  --light: #E3F2FD;
}

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

body {
  background: linear-gradient(135deg, var(--primary), var(--dark));
  color: var(--text);
  font-family: 'Segoe UI', Roboto, -apple-system, BlinkMacSystemFont, sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

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

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(26, 35, 126, 0.95);
  backdrop-filter: blur(10px);
  z-index: 1000;
  padding: 20px 0;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
}

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

.nav-links {
  display: flex;
  gap: 30px;
}

.nav-link {
  color: var(--secondary);
  text-decoration: none;
  font-weight: 500;
  font-size: 16px;
  position: relative;
  transition: all 0.3s ease;
}

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

.nav-link::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 0;
  height: 2px;
  background: var(--accent);
  transition: width 0.3s ease;
}

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

.banner {
  height: 100vh;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
}

.banner::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: -1;
}

.banner-content {
  max-width: 800px;
  margin: 0 auto;
  text-align: center;
  padding: 20px;
}

.banner-title {
  font-size: 3.5rem;
  margin-bottom: 20px;
  text-shadow: 0 4px 10px rgba(0, 0, 0, 0.3);
  animation: fadeInUp 1s ease;
}

.banner-subtitle {
  font-size: 1.5rem;
  margin-bottom: 30px;
  color: var(--secondary);
  animation: fadeInUp 1s ease 0.2s forwards;
  opacity: 0;
}

.notice {
  background: rgba(255, 255, 255, 0.1);
  padding: 15px;
  border-radius: 8px;
  margin: 30px 0;
  border-left: 4px solid var(--accent);
  animation: fadeIn 1s ease 0.4s forwards;
  opacity: 0;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 50px;
  text-align: center;
  position: relative;
  display: inline-block;
  left: 50%;
  transform: translateX(-50%);
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
}

.content-block {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 15px;
  padding: 40px;
  margin-bottom: 50px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.content-block:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
}

.content-title {
  font-size: 1.8rem;
  margin-bottom: 20px;
  color: var(--secondary);
}

.content-text {
  font-size: 1.1rem;
  margin-bottom: 20px;
  line-height: 1.8;
}

.code-block {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  font-family: 'Courier New', monospace;
  border-left: 4px solid var(--secondary);
}

.code-block code {
  color: var(--light);
  font-size: 0.95rem;
}

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

.image-item {
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
  position: relative;
}

.image-item:hover {
  transform: scale(1.03);
}

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

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

.image-caption {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(to top, rgba(0,0,0,0.8), transparent);
  padding: 15px;
  color: white;
  opacity: 0;
  transition: opacity 0.3s ease;
}

.image-item:hover .image-caption {
  opacity: 1;
}

.table-wrapper {
  overflow-x: auto;
  margin: 30px 0;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
}

table {
  width: 100%;
  border-collapse: collapse;
  background: rgba(255, 255, 255, 0.05);
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

th {
  background: rgba(3, 169, 244, 0.2);
  color: var(--secondary);
  font-weight: 500;
}

tr:hover {
  background: rgba(255, 255, 255, 0.05);
}

.footer {
  background: rgba(26, 35, 126, 0.8);
  padding: 50px 0;
  text-align: center;
  margin-top: 100px;
}

.footer-text {
  font-size: 0.9rem;
  opacity: 0.8;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (max-width: 768px) {
  .banner-title {
    font-size: 2.5rem;
  }
  
  .banner-subtitle {
    font-size: 1.2rem;
  }
  
  .section {
    padding: 60px 0;
  }
  
  .content-block {
    padding: 25px;
  }
  
  .nav-links {
    gap: 15px;
  }
}

@media (max-width: 480px) {
  .banner-title {
    font-size: 2rem;
  }
  
  .section-title {
    font-size: 2rem;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
  
  .nav {
    flex-direction: column;
    gap: 15px;
  }
}