:root {
  --primary-color: #0D1B2A;
  --secondary-color: #1B263B;
  --accent-color: #FCA311;
  --highlight-color: #4CC9F0;
  --text-color: #E0E1DD;
  --card-bg: rgba(27, 38, 59, 0.8);
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Montserrat', 'Segoe UI', sans-serif;
  background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
}

.header-banner {
  position: relative;
  height: 400px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  margin-bottom: 60px;
  overflow: hidden;
}

.header-banner::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(13, 27, 42, 0.7);
}

.banner-content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 0 20px;
  max-width: 800px;
}

.banner-content h1 {
  font-size: 2.8rem;
  margin-bottom: 20px;
  text-shadow: 0 2px 10px rgba(0,0,0,0.5);
  background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.notice {
  position: fixed;
  bottom: 20px;
  right: 20px;
  background: var(--accent-color);
  color: var(--primary-color);
  padding: 10px 20px;
  border-radius: 30px;
  font-weight: bold;
  box-shadow: 0 4px 15px rgba(252, 163, 17, 0.3);
  z-index: 1000;
}

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

article {
  background: var(--card-bg);
  border-radius: 12px;
  padding: 40px;
  margin-bottom: 60px;
  box-shadow: 0 10px 30px rgba(0,0,0,0.3);
  border: 1px solid rgba(76, 201, 240, 0.2);
}

article h2 {
  font-size: 2rem;
  color: var(--highlight-color);
  margin-bottom: 30px;
  position: relative;
  padding-bottom: 15px;
}

article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-color), var(--highlight-color));
}

article h3 {
  font-size: 1.5rem;
  color: var(--accent-color);
  margin: 30px 0 20px;
}

article p {
  font-size: 1.1rem;
  margin-bottom: 20px;
}

article color {
  color: var(--highlight-color);
  font-weight: bold;
}

pre {
  background: rgba(13, 27, 42, 0.7);
  border-radius: 8px;
  padding: 20px;
  overflow: auto;
  margin: 25px 0;
  border-left: 4px solid var(--accent-color);
}

code {
  font-family: 'Fira Code', monospace;
  font-size: 0.9rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
  gap: 20px;
  margin: 40px 0;
}

.gallery img {
  width: 100%;
  height: 300px;
  object-fit: cover;
  border-radius: 8px;
  transition: transform 0.3s, box-shadow 0.3s;
  box-shadow: 0 5px 15px rgba(0,0,0,0.2);
}

.gallery img:hover {
  transform: translateY(-5px);
  box-shadow: 0 10px 25px rgba(76, 201, 240, 0.4);
}

.tech-element {
  position: absolute;
  width: 100px;
  height: 100px;
  background: rgba(76, 201, 240, 0.2);
  border: 2px solid var(--highlight-color);
  border-radius: 50%;
  animation: rotate 10s linear infinite;
}

@keyframes rotate {
  0% { transform: rotate(0deg) translateX(200px) rotate(0deg); }
  100% { transform: rotate(360deg) translateX(200px) rotate(-360deg); }
}

.neon-line {
  position: absolute;
  width: 2px;
  height: 100px;
  background: linear-gradient(45deg, var(--accent-color), var(--highlight-color));
  animation: neonMove 5s infinite;
}

@keyframes neonMove {
  0% { transform: translateX(0) translateY(0); opacity: 0.5; }
  50% { transform: translateX(50px) translateY(-50px); opacity: 1; }
  100% { transform: translateX(0) translateY(0); opacity: 0.5; }
}

@media (max-width: 768px) {
  .header-banner {
    height: 300px;
  }
  
  .banner-content h1 {
    font-size: 2rem;
  }
  
  article {
    padding: 25px;
  }
  
  article h2 {
    font-size: 1.5rem;
  }
  
  article h3 {
    font-size: 1.2rem;
  }
  
  .gallery {
    grid-template-columns: 1fr;
  }
}