:root {
  --primary: #0a192f;
  --secondary: #172a45;
  --accent: #00bfff;
  --highlight: #7fffd4;
  --text: #ccd6f6;
  --text-light: #8892b0;
}

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

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

.header {
  position: relative;
  height: 600px;
  display: flex;
  align-items: center;
  justify-content: center;
  background: linear-gradient(135deg, rgba(10,25,47,0.9), rgba(23,42,69,0.8)), 
              url('https://images.gptkong.com/demo/sample1.png');
  background-size: cover;
  background-position: center;
  padding: 0 5%;
  margin-bottom: 80px;
}

.header-content {
  max-width: 1200px;
  width: 100%;
  text-align: center;
  z-index: 2;
}

.header h1 {
  font-size: 3.5rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, var(--accent), var(--highlight));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 4px 20px rgba(0,191,255,0.3);
}

.header p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 30px;
  color: var(--text-light);
}

.note {
  position: absolute;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255,255,255,0.1);
  backdrop-filter: blur(10px);
  padding: 10px 20px;
  border-radius: 20px;
  font-size: 0.9rem;
}

.navbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  padding: 20px 5%;
  background: rgba(10,25,47,0.8);
  backdrop-filter: blur(10px);
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
  transition: all 0.3s ease;
}

.navbar.scrolled {
  padding: 15px 5%;
  background: rgba(10,25,47,0.95);
}

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

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

.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%;
}

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

.section {
  margin-bottom: 100px;
}

.section-title {
  font-size: 2.2rem;
  margin-bottom: 40px;
  position: relative;
  display: inline-block;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -10px;
  left: 0;
  width: 60px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--highlight));
}

.grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(500px, 1fr));
  gap: 30px;
  margin-bottom: 50px;
}

.card {
  background: rgba(255,255,255,0.05);
  border-radius: 15px;
  padding: 30px;
  backdrop-filter: blur(5px);
  border: 1px solid rgba(255,255,255,0.1);
  transition: all 0.3s ease;
}

.card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0,191,255,0.1);
  border-color: rgba(0,191,255,0.3);
}

.card-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 20px;
  box-shadow: 0 10px 20px rgba(0,0,0,0.2);
  transition: transform 0.3s ease;
}

.card:hover .card-img {
  transform: scale(1.03);
}

.card h3 {
  font-size: 1.5rem;
  margin-bottom: 15px;
  color: var(--accent);
}

.card p {
  color: var(--text-light);
  margin-bottom: 20px;
}

.code-block {
  background: rgba(23,42,69,0.8);
  border-radius: 10px;
  padding: 20px;
  margin: 20px 0;
  overflow: auto;
  border-left: 3px solid var(--accent);
}

code {
  font-family: 'Courier New', monospace;
  color: var(--highlight);
  background: transparent;
}

pre {
  margin: 0;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 20px 0;
}

th {
  background: rgba(0,191,255,0.1);
  padding: 15px;
  text-align: left;
  color: var(--accent);
}

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

.footer {
  background: var(--secondary);
  padding: 50px 5%;
  text-align: center;
  margin-top: 100px;
}

.footer p {
  color: var(--text-light);
  margin-bottom: 20px;
}

@media (max-width: 768px) {
  .header h1 {
    font-size: 2.5rem;
  }
  
  .grid {
    grid-template-columns: 1fr;
  }
  
  .nav-links {
    display: none;
  }
}

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

.floating {
  animation: float 6s ease-in-out infinite;
}

.gradient-text {
  background: linear-gradient(90deg, var(--accent), var(--highlight));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}