:root {
    --primary: #1e3c72;
    --secondary: #2a5298;
    --accent: #00FFFF;
    --accent2: #8A2BE2;
    --text: #E0E0E0;
    --dark: #121212;
    --light: #f5f5f5;
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  @font-face {
    font-family: 'Montserrat';
    src: url('Montserrat-Regular.woff2') format('woff2');
    font-weight: normal;
    font-style: normal;
  }

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

  body {
    font-family: 'Montserrat', sans-serif;
    background: linear-gradient(135deg, var(--primary), var(--secondary));
    color: var(--text);
    line-height: 1.6;
    padding-top: 80px;
    overflow-x: hidden;
  }

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

  /* Header */
  .header {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    background: rgba(30, 60, 114, 0.9);
    backdrop-filter: blur(10px);
    z-index: 1000;
    box-shadow: 0 4px 30px rgba(0, 0, 0, 0.1);
    padding: 15px 0;
  }

  .header-container {
    display: flex;
    justify-content: space-between;
    align-items: center;
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
  }

  .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--accent);
    text-decoration: none;
    display: flex;
    align-items: center;
    gap: 10px;
  }

  .logo span {
    color: var(--text);
  }

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

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

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

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

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

  .hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
  }

  .hamburger div {
    width: 25px;
    height: 3px;
    background: var(--text);
    margin: 4px 0;
    transition: var(--transition);
  }

  /* Hero */
  .hero {
    height: 600px;
    display: flex;
    align-items: center;
    position: relative;
    overflow: hidden;
  }

  .hero::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: radial-gradient(circle at 50% 50%, rgba(138, 43, 226, 0.1), transparent 70%);
    z-index: -1;
  }

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

  .hero-title {
    font-size: 3rem;
    margin-bottom: 20px;
    background: linear-gradient(90deg, var(--accent), var(--accent2));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    line-height: 1.2;
  }

  .hero-subtitle {
    font-size: 1.2rem;
    margin-bottom: 30px;
    opacity: 0.9;
  }

  .hero-image {
    position: absolute;
    right: -100px;
    top: 50%;
    transform: translateY(-50%);
    width: 600px;
    height: 600px;
    background: url('https://images.gptkong.com/demo/sample1.png') no-repeat center/contain;
    opacity: 0.8;
    filter: drop-shadow(0 0 20px rgba(0, 255, 255, 0.3));
  }

  /* Main Content */
  .main {
    padding: 80px 0;
  }

  .section {
    margin-bottom: 100px;
    position: relative;
  }

  .section-title {
    font-size: 2rem;
    margin-bottom: 40px;
    position: relative;
    display: inline-block;
  }

  .section-title::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 50%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent), transparent);
  }

  .section-content {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 40px;
    align-items: center;
  }

  .section-text {
    font-size: 1.1rem;
    line-height: 1.8;
  }

  .section-image {
    border-radius: 15px;
    overflow: hidden;
    box-shadow: 0 10px 30px rgba(0, 0, 0, 0.2);
    transition: var(--transition);
    height: 350px;
    background: url('https://images.gptkong.com/demo/sample2.png') no-repeat center/cover;
  }

  .section-image:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 40px rgba(0, 0, 0, 0.3);
  }

  /* Code Blocks */
  pre {
    background: rgba(0, 0, 0, 0.3);
    border-radius: 10px;
    padding: 20px;
    overflow-x: auto;
    margin: 30px 0;
    border-left: 3px solid var(--accent);
    font-family: 'Courier New', Courier, monospace;
    font-size: 0.9rem;
    line-height: 1.5;
  }

  code {
    color: var(--accent);
  }

  /* Grid Layout */
  .grid-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .grid-item {
    background: rgba(255, 255, 255, 0.05);
    backdrop-filter: blur(10px);
    border-radius: 15px;
    padding: 30px;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

  .grid-item:hover {
    transform: translateY(-10px);
    background: rgba(255, 255, 255, 0.1);
    box-shadow: 0 10px 20px rgba(0, 0, 0, 0.2);
  }

  .grid-item-title {
    font-size: 1.3rem;
    margin-bottom: 15px;
    color: var(--accent);
  }

  /* Cards */
  .card-container {
    display: flex;
    flex-wrap: wrap;
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    flex: 1 1 300px;
    background: rgba(255, 255, 255, 0.05);
    border-radius: 15px;
    overflow: hidden;
    transition: var(--transition);
    border: 1px solid rgba(255, 255, 255, 0.1);
  }

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

  .card-image {
    height: 200px;
    background: url('https://images.gptkong.com/demo/sample3.png') no-repeat center/cover;
  }

  .card-content {
    padding: 20px;
  }

  .card-title {
    font-size: 1.2rem;
    margin-bottom: 10px;
    color: var(--accent);
  }

  /* Footer */
  .footer {
    background: rgba(0, 0, 0, 0.3);
    padding: 50px 0;
    text-align: center;
    position: relative;
  }

  .footer::before {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 2px;
    background: linear-gradient(90deg, transparent, var(--accent), transparent);
  }

  .footer-text {
    margin-bottom: 20px;
    opacity: 0.7;
  }

  .footer-link {
    color: var(--accent);
    text-decoration: none;
    transition: var(--transition);
  }

  .footer-link:hover {
    text-decoration: underline;
  }

  /* Responsive */
  @media (max-width: 1024px) {
    .hero {
      height: auto;
      padding: 100px 0;
    }

    .hero-image {
      position: relative;
      right: auto;
      top: auto;
      transform: none;
      width: 100%;
      height: 400px;
      margin-top: 50px;
    }

    .section-content {
      grid-template-columns: 1fr;
    }

    .section-image {
      order: -1;
      height: 300px;
    }
  }

  @media (max-width: 768px) {
    .nav {
      display: none;
      position: absolute;
      top: 70px;
      left: 0;
      width: 100%;
      background: rgba(30, 60, 114, 0.95);
      flex-direction: column;
      align-items: center;
      padding: 20px 0;
      gap: 15px;
    }

    .nav.active {
      display: flex;
    }

    .hamburger {
      display: flex;
    }

    .hero-title {
      font-size: 2.5rem;
    }

    .hero-subtitle {
      font-size: 1rem;
    }
  }

  @media (max-width: 480px) {
    .hero-title {
      font-size: 2rem;
    }

    .section-title {
      font-size: 1.5rem;
    }
  }

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

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

  /* Notification */
  .notification {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0, 0, 0, 0.7);
    color: white;
    padding: 15px 25px;
    border-radius: 5px;
    z-index: 1001;
    backdrop-filter: blur(10px);
    border-left: 3px solid var(--accent);
    transform: translateX(200%);
    transition: transform 0.5s ease;
  }

  .notification.show {
    transform: translateX(0);
  }