:root {
  --primary-bg: #0d0d0d;
  --secondary-bg: #1a1a1a;
  --accent-blue: #00ffff;
  --accent-green: #00ff00;
  --text-color: #ffffff;
  --highlight: rgba(0, 255, 255, 0.1);
  --card-bg: #1e1e1e;
  --grid-gap: 20px;
  --border-radius: 8px;
  --transition: all 0.3s ease;
}

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

body {
  background-color: var(--primary-bg);
  color: var(--text-color);
  font-family: 'Roboto', sans-serif;
  line-height: 1.6;
  padding-top: 70px;
  overflow-x: hidden;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: linear-gradient(90deg, var(--primary-bg) 0%, var(--secondary-bg) 100%);
  padding: 15px 5%;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  border-bottom: 1px solid var(--accent-blue);
}

.header::after {
  content: '';
  position: absolute;
  bottom: -5px;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  opacity: 0.7;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
}

.nav-links {
  display: flex;
  gap: 25px;
}

.nav-links a {
  color: var(--text-color);
  text-decoration: none;
  font-size: 1rem;
  position: relative;
  padding: 5px 0;
  transition: var(--transition);
}

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

.nav-links a:hover {
  color: var(--accent-blue);
}

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

.banner {
  height: 400px;
  background: linear-gradient(135deg, rgba(0, 255, 255, 0.1) 0%, rgba(0, 255, 0, 0.1) 100%);
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 15%;
  position: relative;
  overflow: hidden;
  margin-bottom: 50px;
}

.banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample3.png') center/cover no-repeat;
  opacity: 0.1;
  z-index: -1;
}

.banner h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 0 20px rgba(0, 255, 255, 0.3);
}

.banner p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  max-width: 700px;
}

.notice {
  background: var(--highlight);
  padding: 15px;
  border-radius: var(--border-radius);
  border-left: 3px solid var(--accent-blue);
  margin: 30px 0;
  font-size: 0.9rem;
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 5%;
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: var(--grid-gap);
  margin: 50px 0;
}

.card {
  background: var(--card-bg);
  border-radius: var(--border-radius);
  padding: 30px;
  transition: var(--transition);
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  position: relative;
  overflow: hidden;
}

.card::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-blue), var(--accent-green));
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 255, 255, 0.2);
}

.card h2 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--accent-blue);
}

.card p {
  margin-bottom: 20px;
}

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

.image-card {
  border-radius: var(--border-radius);
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  transition: var(--transition);
}

.image-card:hover {
  transform: scale(1.03);
  box-shadow: 0 10px 25px rgba(0, 255, 255, 0.3);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
  transition: var(--transition);
}

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

pre {
  background: #1a1a1a;
  border-radius: var(--border-radius);
  padding: 20px;
  overflow-x: auto;
  margin: 20px 0;
  border-left: 3px solid var(--accent-blue);
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
}

code {
  color: var(--accent-green);
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  background: var(--card-bg);
  border-radius: var(--border-radius);
  overflow: hidden;
}

th, td {
  padding: 15px;
  text-align: left;
  border-bottom: 1px solid #333;
}

th {
  background: rgba(0, 255, 255, 0.1);
  color: var(--accent-blue);
}

tr:hover {
  background: rgba(0, 255, 255, 0.05);
}

.highlight {
  color: var(--accent-blue);
  font-weight: bold;
}

.success {
  color: var(--accent-green);
}

.footer {
  background: var(--secondary-bg);
  padding: 50px 5%;
  text-align: center;
  margin-top: 100px;
  border-top: 1px solid #333;
}

.footer p {
  margin-bottom: 20px;
}

.particles {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  pointer-events: none;
}

.particle {
  position: absolute;
  width: 2px;
  height: 2px;
  background: var(--accent-blue);
  border-radius: 50%;
  animation: move 10s linear infinite;
  opacity: 0.7;
}

@keyframes move {
  0% { transform: translate(0, 0); opacity: 0; }
  10% { opacity: 0.7; }
  90% { opacity: 0.7; }
  100% { transform: translate(100px, 100px); opacity: 0; }
}

@media (max-width: 768px) {
  .header {
    padding: 15px 5%;
  }
  
  .nav-links {
    gap: 15px;
  }
  
  .banner {
    height: 300px;
    padding: 0 10%;
  }
  
  .banner h1 {
    font-size: 2rem;
  }
  
  .banner p {
    font-size: 1rem;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .header {
    flex-direction: column;
    padding: 15px;
  }
  
  .logo {
    margin-bottom: 15px;
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }
  
  .banner {
    height: 250px;
    padding: 0 5%;
  }
  
  .banner h1 {
    font-size: 1.5rem;
  }
}