:root {
  --primary: #1e3c72;
  --secondary: #2a5298;
  --accent: #00ffcc;
  --highlight: #ff9966;
  --text: #f8f9fa;
  --card-bg: rgba(255, 255, 255, 0.15);
  --shadow: 0 8px 32px rgba(31, 38, 135, 0.37);
}

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

body {
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--text);
  line-height: 1.6;
  padding-top: 80px;
}

.header {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(0, 0, 0, 0.7);
  backdrop-filter: blur(10px);
  padding: 1rem 2rem;
  z-index: 1000;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.5rem;
  font-weight: 700;
  background: linear-gradient(45deg, var(--accent), var(--highlight));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.nav-links {
  display: flex;
  gap: 2rem;
}

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

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

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

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

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 2rem;
}

.hero {
  text-align: center;
  padding: 4rem 0;
  position: relative;
  overflow: hidden;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
  opacity: 0.2;
  z-index: -1;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 1rem;
  background: linear-gradient(45deg, var(--accent), var(--highlight));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.hero p {
  font-size: 1.2rem;
  max-width: 800px;
  margin: 0 auto 2rem;
}

.notice {
  background: rgba(255, 255, 255, 0.1);
  padding: 1rem;
  border-radius: 8px;
  margin: 2rem 0;
  text-align: center;
  backdrop-filter: blur(5px);
}

article {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 2rem;
  margin-bottom: 3rem;
  box-shadow: var(--shadow);
}

article h2 {
  font-size: 2rem;
  margin-bottom: 1.5rem;
  color: var(--accent);
}

article h3 {
  font-size: 1.5rem;
  margin: 2rem 0 1rem;
  color: var(--highlight);
}

article p {
  margin-bottom: 1.5rem;
  font-size: 1.1rem;
}

pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 1rem;
  margin: 1.5rem 0;
  overflow-x: auto;
}

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

.features {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 2rem;
  margin: 3rem 0;
}

.feature-card {
  background: var(--card-bg);
  backdrop-filter: blur(10px);
  border-radius: 15px;
  padding: 1.5rem;
  box-shadow: var(--shadow);
  transition: transform 0.3s;
}

.feature-card:hover {
  transform: translateY(-10px);
}

.feature-card h3 {
  color: var(--highlight);
  margin-bottom: 1rem;
}

.feature-card p {
  margin-bottom: 1rem;
}

.gallery {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
  gap: 1.5rem;
  margin: 3rem 0;
}

.gallery img {
  width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s, box-shadow 0.3s;
}

.gallery img:hover {
  transform: scale(1.05);
  box-shadow: 0 8px 25px rgba(0, 0, 0, 0.3);
}

.footer {
  text-align: center;
  padding: 2rem;
  margin-top: 3rem;
  background: rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(5px);
}

@media (max-width: 768px) {
  .nav-links {
    display: none;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  article {
    padding: 1.5rem;
  }
}

@keyframes float {
  0%, 100% {
    transform: translateY(0);
  }
  50% {
    transform: translateY(-10px);
  }
}

.floating {
  animation: float 3s ease-in-out infinite;
}