:root {
  --primary: rgba(255, 255, 255, 0.85);
  --secondary: rgba(107, 140, 230, 0.8);
  --accent: #88e6d5;
  --text: #333;
  --light-text: #666;
  --bg: #f5f8ff;
  --card-bg: rgba(255, 255, 255, 0.2);
  --border: rgba(255, 255, 255, 0.3);
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Helvetica Neue', Arial, sans-serif;
}

body {
  background: var(--bg);
  color: var(--text);
  line-height: 1.6;
  padding: 0;
  margin: 0;
  min-height: 100%;
  overflow-x: hidden;
}

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

.header {
  position: relative;
  padding: 40px 0;
  text-align: center;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  border-radius: 0 0 30px 30px;
  margin-bottom: 50px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.1);
  overflow: hidden;
}

.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-size: 2.5rem;
  color: white;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
  position: relative;
  z-index: 1;
  margin-bottom: 20px;
}

.header p {
  color: white;
  max-width: 800px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
  font-size: 1.1rem;
  opacity: 0.9;
}

.notice {
  background: rgba(255, 255, 255, 0.9);
  padding: 15px;
  border-radius: 10px;
  text-align: center;
  margin: 20px auto;
  max-width: 800px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.1);
  font-size: 0.9rem;
  color: var(--light-text);
}

article {
  background: var(--primary);
  border-radius: 20px;
  padding: 40px;
  margin-bottom: 50px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  backdrop-filter: blur(5px);
}

article h2 {
  font-size: 1.8rem;
  margin-bottom: 25px;
  color: var(--text);
  position: relative;
  padding-bottom: 10px;
}

article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--secondary), var(--accent));
  border-radius: 3px;
}

article h3 {
  font-size: 1.4rem;
  margin: 30px 0 15px;
  color: var(--text);
}

article h4 {
  font-size: 1.2rem;
  margin: 25px 0 10px;
  color: var(--light-text);
}

article p {
  margin-bottom: 20px;
  font-size: 1.05rem;
  line-height: 1.7;
}

article strong {
  color: var(--secondary);
}

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

.card {
  background: var(--card-bg);
  border-radius: 15px;
  padding: 30px;
  backdrop-filter: blur(10px);
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
  border: 1px solid var(--border);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 40px rgba(0, 0, 0, 0.15);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: transform 0.3s ease;
}

.card-img:hover {
  transform: scale(1.02);
}

pre {
  background: rgba(0, 0, 0, 0.05);
  border-radius: 10px;
  padding: 20px;
  margin: 20px 0;
  overflow: auto;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  border-left: 4px solid var(--secondary);
}

code {
  font-family: 'Courier New', monospace;
  background: rgba(0, 0, 0, 0.05);
  padding: 2px 5px;
  border-radius: 3px;
  font-size: 0.9rem;
}

.footer {
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  color: white;
  padding: 30px;
  text-align: center;
  border-radius: 30px 30px 0 0;
  margin-top: 50px;
}

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

.nav {
  position: sticky;
  top: 0;
  background: var(--primary);
  backdrop-filter: blur(10px);
  padding: 15px 0;
  z-index: 100;
  box-shadow: 0 2px 20px rgba(0, 0, 0, 0.1);
}

.nav-container {
  display: flex;
  justify-content: center;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 20px;
}

.nav-link {
  color: var(--text);
  text-decoration: none;
  margin: 0 15px;
  font-weight: 500;
  padding: 5px 10px;
  border-radius: 5px;
  transition: all 0.3s ease;
}

.nav-link:hover {
  color: var(--secondary);
  background: rgba(107, 140, 230, 0.1);
}

.geometric-shape {
  position: absolute;
  width: 100px;
  height: 100px;
  background: linear-gradient(135deg, var(--secondary), var(--accent));
  opacity: 0.1;
  z-index: -1;
}

.shape-1 {
  top: 10%;
  left: 5%;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
  animation: float 6s ease-in-out infinite;
}

.shape-2 {
  bottom: 15%;
  right: 8%;
  clip-path: circle(50% at 50% 50%);
  animation: float 8s ease-in-out infinite reverse;
}

.shape-3 {
  top: 30%;
  right: 15%;
  clip-path: polygon(0% 0%, 100% 0%, 50% 100%);
  animation: float 7s ease-in-out infinite 2s;
}

@keyframes float {
  0% { transform: translateY(0) rotate(0deg); }
  50% { transform: translateY(-20px) rotate(5deg); }
  100% { transform: translateY(0) rotate(0deg); }
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 2rem;
  }
  
  .header p {
    font-size: 1rem;
  }
  
  article {
    padding: 25px;
  }
  
  article h2 {
    font-size: 1.5rem;
  }
  
  article h3 {
    font-size: 1.2rem;
  }
  
  .grid-container {
    grid-template-columns: 1fr;
  }
  
  .nav-container {
    flex-wrap: wrap;
  }
  
  .nav-link {
    margin: 5px;
  }
}

@media (max-width: 480px) {
  .header {
    padding: 30px 0;
  }
  
  .header h1 {
    font-size: 1.8rem;
  }
  
  article {
    padding: 20px;
  }
}