:root {
  --primary: #0E2C4F;
  --secondary: #50E3C2;
  --accent: #FF6347;
  --light: #FFFFFF;
  --dark: #111111;
  --gray: #555555;
}

body {
  margin: 0;
  padding: 0;
  font-family: 'Roboto', sans-serif;
  color: var(--dark);
  background-color: #f8f9fa;
  line-height: 1.6;
}

.header {
  position: relative;
  height: 600px;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  text-align: center;
  background: linear-gradient(135deg, var(--primary), var(--secondary));
  color: var(--light);
}

.header::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: 0;
}

.header-content {
  position: relative;
  z-index: 1;
  max-width: 800px;
  padding: 0 20px;
}

.navbar {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(14, 44, 79, 0.9);
  backdrop-filter: blur(10px);
  display: flex;
  justify-content: center;
  padding: 15px 0;
  z-index: 1000;
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.1);
}

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

.nav-links a {
  color: var(--secondary);
  text-decoration: none;
  font-size: 1rem;
  font-weight: 500;
  transition: all 0.3s ease;
  padding: 5px 10px;
  border-radius: 4px;
}

.nav-links a:hover {
  color: var(--light);
  background: rgba(80, 227, 194, 0.2);
}

.container {
  max-width: 1200px;
  margin: 0 auto;
  padding: 80px 20px;
}

.section {
  margin-bottom: 80px;
  background: var(--light);
  border-radius: 12px;
  padding: 40px;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.05);
  position: relative;
  overflow: hidden;
}

.section::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 5px;
  background: linear-gradient(90deg, var(--primary), var(--secondary));
}

h1, h2, h3, h4 {
  color: var(--primary);
  font-weight: 700;
  margin-top: 0;
}

h1 {
  font-size: 2.5rem;
  margin-bottom: 20px;
}

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

h2::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 60px;
  height: 3px;
  background: var(--secondary);
}

h3 {
  font-size: 1.5rem;
  margin-bottom: 20px;
  color: var(--secondary);
}

p {
  font-size: 1.1rem;
  margin-bottom: 20px;
  color: var(--gray);
}

.code-container {
  background: #282c34;
  border-radius: 8px;
  padding: 20px;
  margin: 30px 0;
  overflow-x: auto;
}

pre {
  margin: 0;
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  line-height: 1.5;
  color: #abb2bf;
}

code {
  font-family: 'Courier New', monospace;
  background: rgba(80, 227, 194, 0.1);
  padding: 2px 5px;
  border-radius: 3px;
  color: var(--secondary);
}

.image-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 20px;
  margin: 40px 0;
}

.image-card {
  border-radius: 8px;
  overflow: hidden;
  box-shadow: 0 5px 15px rgba(0, 0, 0, 0.1);
  transition: all 0.3s ease;
}

.image-card:hover {
  transform: translateY(-5px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
  transition: transform 0.3s ease;
}

.image-card:hover img {
  transform: scale(1.05);
}

.notice {
  background: rgba(80, 227, 194, 0.1);
  border-left: 4px solid var(--secondary);
  padding: 20px;
  margin: 40px 0;
  border-radius: 0 8px 8px 0;
}

.notice p {
  margin: 0;
  color: var(--primary);
  font-weight: 500;
}

.footer {
  background: var(--primary);
  color: var(--light);
  padding: 60px 0;
  text-align: center;
}

.footer p {
  color: rgba(255, 255, 255, 0.7);
  margin: 0;
}

@media (max-width: 992px) {
  .image-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 768px) {
  .header {
    height: 500px;
  }
  
  h1 {
    font-size: 2rem;
  }
  
  h2 {
    font-size: 1.8rem;
  }
  
  .section {
    padding: 30px;
  }
  
  .nav-links {
    gap: 15px;
  }
}

@media (max-width: 576px) {
  .image-grid {
    grid-template-columns: 1fr;
  }
  
  .header {
    height: 400px;
  }
  
  .nav-links {
    flex-wrap: wrap;
    justify-content: center;
    gap: 10px;
  }
  
  .section {
    padding: 20px;
  }
}

@keyframes fadeIn {
  from { opacity: 0; transform: translateY(20px); }
  to { opacity: 1; transform: translateY(0); }
}

.fade-in {
  animation: fadeIn 0.8s ease-out forwards;
}

.delay-1 { animation-delay: 0.2s; }
.delay-2 { animation-delay: 0.4s; }
.delay-3 { animation-delay: 0.6s; }