:root {
  --primary: #0d47a1;
  --secondary: #42a5f5;
  --accent: #00e676;
  --dark: #010a13;
  --light: #f5f7fa;
  --gray: #90a4ae;
}

@font-face {
  font-family: 'TechFont';
  src: local('Helvetica Neue'), local('Arial'), sans-serif;
}

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

html {
  scroll-behavior: smooth;
}

body {
  background: linear-gradient(135deg, var(--dark), var(--primary));
  color: var(--light);
  font-family: 'TechFont', sans-serif;
  line-height: 1.6;
  overflow-x: hidden;
}

header {
  position: fixed;
  top: 0;
  width: 100%;
  background: rgba(13, 71, 161, 0.95);
  padding: 1.5rem;
  z-index: 1000;
  box-shadow: 0 4px 30px rgba(0, 0, 0, 0.3);
  backdrop-filter: blur(10px);
}

.nav-container {
  max-width: 1200px;
  margin: 0 auto;
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.logo {
  font-size: 1.8rem;
  font-weight: 700;
  background: linear-gradient(to right, var(--secondary), var(--accent));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  text-shadow: 0 2px 10px rgba(66, 165, 245, 0.3);
}

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

.nav-links a {
  color: var(--light);
  text-decoration: none;
  font-weight: 500;
  position: relative;
  padding: 0.5rem 0;
  transition: all 0.3s ease;
}

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

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

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

.main-content {
  max-width: 1200px;
  margin: 8rem auto 4rem;
  padding: 0 2rem;
}

.hero {
  min-height: 80vh;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: flex-start;
  position: relative;
  padding: 4rem 0;
}

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

.hero h1 {
  font-size: 3.5rem;
  margin-bottom: 1.5rem;
  background: linear-gradient(to right, var(--light), var(--secondary));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  line-height: 1.2;
}

.hero p {
  font-size: 1.2rem;
  max-width: 600px;
  margin-bottom: 2rem;
  color: var(--gray);
}

.notice {
  background: rgba(255, 255, 255, 0.1);
  padding: 1rem;
  border-left: 4px solid var(--accent);
  margin: 2rem 0;
  border-radius: 0 4px 4px 0;
}

.notice p {
  color: var(--light);
  font-size: 0.9rem;
}

article {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  padding: 3rem;
  margin: 4rem 0;
  box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
  backdrop-filter: blur(10px);
}

article h2 {
  font-size: 2.2rem;
  margin-bottom: 2rem;
  color: var(--secondary);
  position: relative;
  padding-bottom: 1rem;
}

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

article h3 {
  font-size: 1.8rem;
  margin: 2.5rem 0 1.5rem;
  color: var(--light);
}

article p {
  font-size: 1.1rem;
  margin-bottom: 1.5rem;
  color: var(--gray);
}

article strong {
  color: var(--light);
  font-weight: 600;
}

pre {
  background: rgba(0, 0, 0, 0.3);
  border-radius: 8px;
  padding: 1.5rem;
  margin: 2rem 0;
  overflow: auto;
  border-left: 4px solid var(--accent);
}

code {
  font-family: 'Courier New', monospace;
  font-size: 0.9rem;
  color: var(--accent);
}

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

.image-card {
  background: rgba(255, 255, 255, 0.05);
  border-radius: 12px;
  overflow: hidden;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.image-card:hover {
  transform: translateY(-10px);
  box-shadow: 0 15px 30px rgba(0, 0, 0, 0.3);
}

.image-card img {
  width: 100%;
  height: auto;
  display: block;
  border-radius: 12px 12px 0 0;
}

.image-caption {
  padding: 1.5rem;
  background: rgba(0, 0, 0, 0.2);
}

.image-caption h4 {
  color: var(--light);
  margin-bottom: 0.5rem;
}

.image-caption p {
  color: var(--gray);
  font-size: 0.9rem;
}

table {
  width: 100%;
  border-collapse: collapse;
  margin: 2rem 0;
  background: rgba(255, 255, 255, 0.05);
  border-radius: 8px;
  overflow: hidden;
}

th, td {
  padding: 1rem;
  text-align: left;
  border-bottom: 1px solid rgba(255, 255, 255, 0.1);
}

th {
  background: rgba(0, 0, 0, 0.3);
  color: var(--secondary);
  font-weight: 600;
}

tr:hover {
  background: rgba(66, 165, 245, 0.1);
}

ol, ul {
  margin: 1.5rem 0;
  padding-left: 2rem;
}

li {
  margin-bottom: 0.8rem;
  color: var(--gray);
}

footer {
  background: rgba(0, 0, 0, 0.5);
  padding: 3rem 0;
  text-align: center;
  margin-top: 4rem;
}

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

.footer-links {
  display: flex;
  justify-content: center;
  gap: 2rem;
  margin-bottom: 2rem;
}

.footer-links a {
  color: var(--gray);
  text-decoration: none;
  transition: color 0.3s ease;
}

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

.copyright {
  color: var(--gray);
  font-size: 0.9rem;
}

.wave-decoration {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 150px;
  background: url('https://images.gptkong.com/demo/sample2.png') repeat-x;
  background-size: contain;
  opacity: 0.3;
  animation: waveAnimation 20s linear infinite;
}

@keyframes waveAnimation {
  0% {
    background-position-x: 0;
  }
  100% {
    background-position-x: 1000px;
  }
}

@media (max-width: 768px) {
  .nav-links {
    gap: 1rem;
  }
  
  .hero h1 {
    font-size: 2.5rem;
  }
  
  article {
    padding: 2rem;
  }
  
  .image-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 480px) {
  .nav-container {
    flex-direction: column;
    gap: 1rem;
  }
  
  .hero h1 {
    font-size: 2rem;
  }
  
  article h2 {
    font-size: 1.8rem;
  }
  
  article h3 {
    font-size: 1.5rem;
  }
}