:root {
  --primary-color: #0d47a1;
  --secondary-color: #42a5f5;
  --accent-color: #ff9800;
  --dark-bg: #121a2d;
  --light-bg: #f8f9fa;
  --text-light: #e0e0e0;
  --text-dark: #333333;
}

body {
  background: linear-gradient(135deg, var(--dark-bg), var(--primary-color));
  color: var(--text-light);
  font-family: 'Open Sans', sans-serif;
  line-height: 1.6;
  margin: 0;
  padding: 0;
  min-height: 100%;
}

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

.header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(13, 71, 161, 0.9);
  backdrop-filter: blur(10px);
  z-index: 1000;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
}

.navbar {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 0;
}

.nav-logo {
  font-size: 1.5rem;
  font-weight: bold;
  color: white;
  text-decoration: none;
}

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

.nav-item {
  position: relative;
  color: white;
  text-decoration: none;
  font-weight: 500;
  transition: all 0.3s ease;
}

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

.dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  background: var(--secondary-color);
  border-radius: 4px;
  padding: 10px;
  min-width: 150px;
  display: none;
  box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
}

.nav-item:hover .dropdown {
  display: block;
  animation: fadeIn 0.3s ease-out;
}

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

.hero-content {
  max-width: 800px;
  z-index: 1;
}

.hero h1 {
  font-size: 3rem;
  margin-bottom: 20px;
  background: linear-gradient(to right, #ffffff, var(--accent-color));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
}

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

.hero-bg {
  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: 0;
}

.section {
  padding: 100px 0;
  position: relative;
}

.section-title {
  font-size: 2.5rem;
  margin-bottom: 50px;
  text-align: center;
  position: relative;
}

.section-title::after {
  content: '';
  position: absolute;
  bottom: -15px;
  left: 50%;
  transform: translateX(-50%);
  width: 80px;
  height: 4px;
  background: var(--accent-color);
  border-radius: 2px;
}

.content-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(500px, 1fr));
  gap: 40px;
  align-items: center;
}

.content-text {
  padding: 30px;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 10px;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.1);
  box-shadow: 0 15px 35px rgba(0, 0, 0, 0.2);
  transition: transform 0.3s ease;
}

.content-text:hover {
  transform: translateY(-10px);
}

.content-illustration {
  display: flex;
  justify-content: center;
  align-items: center;
}

.content-illustration img {
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  box-shadow: 0 20px 40px rgba(0, 0, 0, 0.3);
  transition: transform 0.3s ease;
}

.content-illustration img:hover {
  transform: scale(1.05);
}

.code-block {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 20px;
  margin: 20px 0;
  overflow-x: auto;
  border-left: 4px solid var(--accent-color);
}

code {
  font-family: 'Courier New', monospace;
  color: #f8f8f2;
}

.footer {
  text-align: center;
  padding: 30px 0;
  background: rgba(0, 0, 0, 0.2);
  margin-top: 100px;
}

.notice {
  background: rgba(255, 152, 0, 0.1);
  border-left: 4px solid var(--accent-color);
  padding: 15px;
  margin: 30px 0;
  border-radius: 0 4px 4px 0;
}

@keyframes fadeIn {
  from { opacity: 0; }
  to { opacity: 1; }
}

@media (max-width: 768px) {
  .navbar {
    flex-direction: column;
    padding: 15px 0;
  }
  
  .nav-menu {
    margin-top: 15px;
    flex-direction: column;
    gap: 15px;
    align-items: center;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  .content-grid {
    grid-template-columns: 1fr;
  }
}