:root {
    --primary: #0D47A1;
    --secondary: #37474F;
    --accent: #FF9800;
    --text: #FFFFFF;
    --bg-gradient: linear-gradient(135deg, var(--primary), var(--secondary));
    --card-bg: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s ease;
  }

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

  body {
    background: var(--bg-gradient);
    color: var(--text);
    font-family: 'Roboto', sans-serif;
    line-height: 1.6;
    overflow-x: hidden;
  }

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

  header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(10px);
    z-index: 1000;
    padding: 15px 0;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.3);
  }

  .nav-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
  }

  .logo {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--accent);
    text-decoration: none;
  }

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

  .nav-links a {
    color: var(--text);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    position: relative;
  }

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

  .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 {
    min-height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
    padding-top: 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: 0.2;
    z-index: -1;
  }

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

  .hero h1 {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(to right, var(--text), var(--accent));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }

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

  .flow-line {
    position: absolute;
    width: 100%;
    height: 2px;
    background: linear-gradient(to right, transparent, var(--accent), transparent);
    animation: flow 5s linear infinite;
    z-index: -1;
  }

  @keyframes flow {
    from { transform: translateX(-100%); }
    to { transform: translateX(100%); }
  }

  .section {
    padding: 80px 0;
  }

  .section-title {
    font-size: 2.5rem;
    margin-bottom: 40px;
    text-align: center;
    position: relative;
  }

  .section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 50%;
    transform: translateX(-50%);
    width: 100px;
    height: 3px;
    background: var(--accent);
  }

  .grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin-top: 40px;
  }

  .card {
    background: var(--card-bg);
    border-radius: 10px;
    padding: 30px;
    transition: var(--transition);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.1);
    position: relative;
    overflow: hidden;
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0, 0, 0, 0.2);
  }

  .card::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 5px;
    background: var(--accent);
  }

  .card h3 {
    font-size: 1.5rem;
    margin-bottom: 15px;
    color: var(--accent);
  }

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

  .card-img {
    width: 100%;
    height: 200px;
    object-fit: cover;
    border-radius: 5px;
    margin-bottom: 20px;
    transition: var(--transition);
  }

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

  .split-section {
    display: flex;
    flex-wrap: wrap;
    align-items: center;
    gap: 40px;
    margin: 60px 0;
  }

  .split-content, .split-image {
    flex: 1;
    min-width: 300px;
  }

  .split-image img {
    width: 100%;
    border-radius: 10px;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
    transition: var(--transition);
  }

  .split-image img:hover {
    transform: scale(1.02);
  }

  .code-block {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow: auto;
    font-family: 'Courier New', monospace;
    border-left: 4px solid var(--accent);
  }

  .code-block pre {
    margin: 0;
  }

  .code-block code {
    color: var(--text);
    font-size: 0.9rem;
  }

  .btn {
    display: inline-block;
    background: var(--accent);
    color: var(--text);
    padding: 12px 25px;
    border-radius: 5px;
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition);
    border: none;
    cursor: pointer;
    box-shadow: 0 5px 15px rgba(255, 152, 0, 0.3);
  }

  .btn:hover {
    background: #FFA726;
    transform: translateY(-3px);
    box-shadow: 0 8px 20px rgba(255, 152, 0, 0.4);
  }

  footer {
    background: rgba(0, 0, 0, 0.5);
    padding: 40px 0;
    text-align: center;
    margin-top: 80px;
  }

  .footer-text {
    opacity: 0.8;
    font-size: 0.9rem;
  }

  .scroll-indicator {
    position: fixed;
    top: 0;
    left: 0;
    height: 4px;
    background: var(--accent);
    width: 0%;
    z-index: 1001;
  }

  @media (max-width: 768px) {
    .hero h1 {
      font-size: 2.5rem;
    }
    
    .nav-links {
      gap: 15px;
    }
    
    .split-section {
      flex-direction: column;
    }
  }

  @media (max-width: 480px) {
    .hero h1 {
      font-size: 2rem;
    }
    
    .nav-links {
      display: none;
    }
    
    .section-title {
      font-size: 2rem;
    }
  }