:root {
  --primary: #0A0A0A;
  --secondary: #1E90FF;
  --accent: #6A11CB;
  --text: #FFFFFF;
  --bg-gradient: linear-gradient(135deg, #0A0A0A, #1E1E3F);
  --card-bg: rgba(255, 255, 255, 0.05);
  --neon-glow: 0 0 10px rgba(30, 144, 255, 0.7);
}

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

body {
  font-family: 'Montserrat', sans-serif;
  background: var(--bg-gradient);
  color: var(--text);
  line-height: 1.6;
  overflow-x: hidden;
}

.header {
  position: relative;
  height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  padding: 0 20px;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
}

.header::after {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(10, 10, 10, 0.7);
  z-index: 1;
}

.header-content {
  position: relative;
  z-index: 2;
  max-width: 800px;
}

h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #1E90FF, #6A11CB);
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  animation: gradientShift 8s ease infinite;
}

@keyframes gradientShift {
  0% { background-position: 0% 50%; }
  50% { background-position: 100% 50%; }
  100% { background-position: 0% 50%; }
}

.subtitle {
  font-size: 1.5rem;
  margin-bottom: 30px;
  opacity: 0.9;
}

.nav {
  position: sticky;
  top: 0;
  background: rgba(10, 10, 10, 0.95);
  backdrop-filter: blur(10px);
  padding: 20px 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  z-index: 1000;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
}

.nav-logo {
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--secondary);
}

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

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

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

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 40px 20px;
}

.section {
  margin-bottom: 80px;
  opacity: 0;
  transform: translateY(30px);
  transition: opacity 0.8s ease, transform 0.8s ease;
}

.section.visible {
  opacity: 1;
  transform: translateY(0);
}

h2 {
  font-size: 2.5rem;
  margin-bottom: 30px;
  color: var(--secondary);
  position: relative;
  display: inline-block;
}

h2::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--secondary), transparent);
}

h3 {
  font-size: 1.8rem;
  margin: 30px 0 20px;
  color: var(--secondary);
}

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

.card-grid {
  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;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: var(--neon-glow);
}

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

.card-title {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--secondary);
}

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

.card-meta {
  display: flex;
  justify-content: space-between;
  color: rgba(255, 255, 255, 0.7);
  font-size: 0.9rem;
}

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

code {
  font-family: 'Courier New', monospace;
  color: #00FFAA;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 30px 0;
  background: var(--card-bg);
  border-radius: 10px;
  overflow: hidden;
}

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

th {
  background: rgba(30, 144, 255, 0.2);
  color: var(--secondary);
}

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

.footer {
  background: rgba(10, 10, 10, 0.9);
  padding: 40px 0;
  text-align: center;
  margin-top: 80px;
}

.footer-text {
  opacity: 0.7;
  font-size: 0.9rem;
}

.notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: rgba(30, 144, 255, 0.2);
  padding: 10px 20px;
  border-radius: 50px;
  backdrop-filter: blur(5px);
  border: 1px solid rgba(30, 144, 255, 0.5);
  box-shadow: 0 0 15px rgba(30, 144, 255, 0.3);
  z-index: 1000;
}

@media (max-width: 768px) {
  h1 {
    font-size: 2.5rem;
  }
  
  .subtitle {
    font-size: 1.2rem;
  }
  
  .nav {
    padding: 15px 20px;
    flex-direction: column;
    gap: 15px;
  }
  
  .nav-links {
    gap: 15px;
  }
  
  .card-grid {
    grid-template-columns: 1fr;
  }
  
  .section {
    margin-bottom: 60px;
  }
}

@media (max-width: 480px) {
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  h3 {
    font-size: 1.5rem;
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
  }
}