:root {
    --primary: linear-gradient(135deg, #1e3c72 0%, #2a5298 70%);
    --secondary: rgba(42, 82, 152, 0.25);
    --accent: linear-gradient(45deg, #00c6ff, #0072ff);
    --text-light: #ffffff;
    --text-muted: #e0e0e0;
    --card-bg: rgba(255, 255, 255, 0.1);
    --border-radius: 15px;
    --shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    --transition: all 0.3s ease;
  }

  @import url('https://fonts.googleapis.com/css2?family=Montserrat:wght@600;700&family=Roboto:wght@300;400;500&display=swap');

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

  body {
    background: var(--primary);
    color: var(--text-light);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    padding-top: 80px;
    overflow-x: hidden;
  }

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

  /* Header Styles */
  header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(30, 60, 114, 0.95);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: var(--shadow);
  }

  .navbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 40px;
  }

  .logo {
    font-family: 'Montserrat', sans-serif;
    font-weight: 700;
    font-size: 24px;
    background: var(--accent);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

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

  .nav-links a {
    color: var(--text-light);
    text-decoration: none;
    font-family: 'Montserrat', sans-serif;
    font-weight: 600;
    font-size: 16px;
    position: relative;
    transition: var(--transition);
  }

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

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

  /* Hero Section */
  .hero {
    height: 500px;
    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: url('https://images.gptkong.com/demo/sample1.png') center/cover no-repeat;
    opacity: 0.1;
    z-index: -1;
  }

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

  .hero h1 {
    font-family: 'Montserrat', sans-serif;
    font-size: 48px;
    margin-bottom: 20px;
    line-height: 1.2;
    text-shadow: 0 5px 15px rgba(0, 0, 0, 0.3);
  }

  .hero p {
    font-size: 18px;
    margin-bottom: 30px;
    color: var(--text-muted);
  }

  .notice {
    background: rgba(255, 255, 255, 0.1);
    padding: 15px;
    border-radius: var(--border-radius);
    margin-bottom: 40px;
    border-left: 4px solid #00c6ff;
  }

  /* Article Styles */
  article {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: var(--border-radius);
    padding: 40px;
    margin-bottom: 60px;
    box-shadow: var(--shadow);
  }

  article h2 {
    font-family: 'Montserrat', sans-serif;
    font-size: 32px;
    margin-bottom: 30px;
    background: var(--accent);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    display: inline-block;
  }

  article h3 {
    font-family: 'Montserrat', sans-serif;
    font-size: 24px;
    margin: 40px 0 20px;
    color: var(--text-light);
  }

  article p {
    margin-bottom: 20px;
    font-size: 17px;
  }

  /* Code Block Styles */
  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: var(--border-radius);
    padding: 20px;
    margin: 30px 0;
    overflow: hidden;
    position: relative;
  }

  pre::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--accent);
  }

  code {
    font-family: 'Roboto Mono', monospace;
    font-size: 15px;
    color: #ffffff;
  }

  /* Card Styles */
  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 50px 0;
  }

  .card {
    background: var(--card-bg);
    border-radius: var(--border-radius);
    padding: 30px;
    transition: var(--transition);
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
  }

  .card::after {
    content: '';
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: linear-gradient(
      to bottom right,
      rgba(255, 255, 255, 0) 0%,
      rgba(255, 255, 255, 0.1) 50%,
      rgba(255, 255, 255, 0) 100%
    );
    transform: rotate(30deg);
    transition: var(--transition);
    opacity: 0;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 35px rgba(0, 0, 0, 0.3);
  }

  .card:hover::after {
    animation: shine 1.5s;
  }

  @keyframes shine {
    0% {
      transform: rotate(30deg) translate(-30%, -30%);
      opacity: 0;
    }
    20% {
      opacity: 1;
    }
    100% {
      transform: rotate(30deg) translate(30%, 30%);
      opacity: 0;
    }
  }

  .card img {
    width: 100%;
    border-radius: 10px;
    margin-bottom: 20px;
    transition: var(--transition);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }

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

  .card h4 {
    font-family: 'Montserrat', sans-serif;
    font-size: 20px;
    margin-bottom: 15px;
    color: var(--text-light);
  }

  .card p {
    color: var(--text-muted);
    font-size: 15px;
  }

  /* Footer Styles */
  footer {
    background: rgba(0, 0, 0, 0.2);
    padding: 40px 0;
    margin-top: 80px;
  }

  .footer-content {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 40px;
  }

  .footer-column h4 {
    font-family: 'Montserrat', sans-serif;
    font-size: 18px;
    margin-bottom: 20px;
    color: var(--text-light);
  }

  .footer-column ul {
    list-style: none;
  }

  .footer-column li {
    margin-bottom: 10px;
  }

  .footer-column a {
    color: var(--text-muted);
    text-decoration: none;
    transition: var(--transition);
  }

  .footer-column a:hover {
    color: var(--text-light);
  }

  .copyright {
    text-align: center;
    margin-top: 40px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
    color: var(--text-muted);
    font-size: 14px;
  }

  /* Animations */
  @keyframes float {
    0%, 100% {
      transform: translateY(0);
    }
    50% {
      transform: translateY(-20px);
    }
  }

  .floating {
    animation: float 6s ease-in-out infinite;
  }

  /* Responsive Styles */
  @media (max-width: 992px) {
    .hero h1 {
      font-size: 36px;
    }
    
    .card-grid {
      grid-template-columns: repeat(auto-fill, minmax(250px, 1fr));
    }
  }

  @media (max-width: 768px) {
    .navbar {
      padding: 15px 20px;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    .hero {
      height: auto;
      padding: 100px 0;
    }
    
    article {
      padding: 30px;
    }
  }

  @media (max-width: 576px) {
    .hero h1 {
      font-size: 28px;
    }
    
    .hero p {
      font-size: 16px;
    }
    
    article h2 {
      font-size: 26px;
    }
    
    article h3 {
      font-size: 20px;
    }
    
    .card-grid {
      grid-template-columns: 1fr;
    }
  }