:root {
  --primary-blue: #0A74DA;
  --secondary-gray: #B0B0B0;
  --accent-green: #2ECC71;
  --accent-blue: #3498DB;
  --dark-bg: #0A1625;
  --light-bg: rgba(255, 255, 255, 0.05);
  --text-color: #E0E0E0;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
}

body {
  background: var(--dark-bg);
  color: var(--text-color);
  line-height: 1.6;
  overflow-x: hidden;
  padding-top: 80px;
}

.header-notice {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: rgba(10, 22, 37, 0.9);
  backdrop-filter: blur(5px);
  padding: 15px;
  text-align: center;
  z-index: 1000;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
  font-size: 14px;
  color: var(--accent-green);
}

.navbar {
  position: fixed;
  top: 40px;
  left: 0;
  width: 100%;
  background: rgba(10, 116, 218, 0.1);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: center;
  align-items: center;
  padding: 15px 5%;
  z-index: 999;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

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

.nav-links a {
  color: white;
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 5px 0;
  transition: color 0.3s ease;
  font-size: 16px;
}

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

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

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

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

.hero {
  height: 600px;
  display: flex;
  align-items: center;
  position: relative;
  overflow: hidden;
  margin-bottom: 80px;
}

.hero::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: radial-gradient(circle at 30% 50%, rgba(10, 116, 218, 0.2) 0%, rgba(10, 22, 37, 0.9) 70%);
  z-index: -1;
}

.hero-content {
  max-width: 600px;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  background: linear-gradient(90deg, #FFFFFF, var(--accent-blue));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}

.hero p {
  font-size: 1.2rem;
  margin-bottom: 30px;
  opacity: 0.9;
}

.hero-image {
  position: absolute;
  right: 0;
  top: 50%;
  transform: translateY(-50%);
  width: 500px;
  height: 500px;
  background: url('https://images.gptkong.com/demo/sample1.png') center/cover;
  border-radius: 20px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transition: all 0.5s ease;
}

.hero-image:hover {
  transform: translateY(-50%) scale(1.05);
}

article {
  background: var(--light-bg);
  backdrop-filter: blur(10px);
  border-radius: 20px;
  padding: 40px;
  margin-bottom: 80px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  border: 1px solid rgba(255, 255, 255, 0.1);
}

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

article h2::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100px;
  height: 3px;
  background: linear-gradient(90deg, var(--accent-green), var(--accent-blue));
}

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

article p {
  margin-bottom: 20px;
  font-size: 1.1rem;
  line-height: 1.7;
}

.code-container {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 10px;
  padding: 20px;
  margin: 30px 0;
  overflow: hidden;
  border-left: 4px solid var(--accent-green);
}

pre {
  margin: 0;
  white-space: pre-wrap;
  font-family: 'Courier New', Courier, monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #f8f8f2;
}

code {
  font-family: inherit;
}

.feature-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
  gap: 30px;
  margin: 50px 0;
}

.feature-card {
  background: rgba(10, 22, 37, 0.5);
  border-radius: 15px;
  padding: 30px;
  transition: all 0.3s ease;
  border: 1px solid rgba(255, 255, 255, 0.1);
}

.feature-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
  border-color: var(--accent-blue);
}

.feature-card img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  border-radius: 10px;
  margin-bottom: 20px;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.2);
  transition: all 0.3s ease;
}

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

.feature-card h4 {
  font-size: 1.3rem;
  margin-bottom: 15px;
  color: white;
}

.feature-card p {
  font-size: 1rem;
  opacity: 0.9;
}

.footer {
  background: rgba(10, 22, 37, 0.8);
  padding: 50px 0;
  text-align: center;
  border-top: 1px solid rgba(255, 255, 255, 0.1);
}

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

.social-links {
  display: flex;
  justify-content: center;
  gap: 20px;
  margin-top: 30px;
}

.social-links a {
  display: inline-block;
  width: 40px;
  height: 40px;
  background: rgba(255, 255, 255, 0.1);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.3s ease;
}

.social-links a:hover {
  background: var(--accent-blue);
  transform: translateY(-5px);
}

@media (max-width: 1024px) {
  .hero {
    height: auto;
    padding: 100px 0;
    flex-direction: column;
    text-align: center;
  }
  
  .hero-content {
    max-width: 100%;
    margin-bottom: 50px;
  }
  
  .hero-image {
    position: relative;
    transform: none;
    top: auto;
    right: auto;
    margin: 0 auto;
  }
}

@media (max-width: 768px) {
  .nav-links {
    gap: 15px;
  }
  
  article {
    padding: 30px 20px;
  }
  
  .hero h1 {
    font-size: 2.2rem;
  }
  
  .hero-image {
    width: 300px;
    height: 300px;
  }
}

@media (max-width: 500px) {
  .nav-links {
    flex-direction: column;
    gap: 10px;
  }
  
  .hero h1 {
    font-size: 1.8rem;
  }
  
  .feature-grid {
    grid-template-columns: 1fr;
  }
}