:root {
    --primary-dark: #0f2027;
    --primary-mid: #203a43;
    --primary-light: #2c5364;
    --accent-gold: #ffd700;
    --accent-orange: #ff9800;
    --accent-purple: #6a3093;
    --text-light: #ffffff;
    --text-dim: #cccccc;
    --card-bg: rgba(255, 255, 255, 0.1);
    --transition: all 0.3s cubic-bezier(0.25, 0.8, 0.25, 1);
  }

  @font-face {
    font-family: 'Montserrat';
    src: url('https://fonts.gstatic.com/s/montserrat/v25/JTUHjIg1_i6t8kCHKm4532VJOt5-QNFgpCs16Ew-.ttf') format('truetype');
  }

  @font-face {
    font-family: 'Open Sans';
    src: url('https://fonts.gstatic.com/s/opensans/v35/memSYaGs126MiZpBA-UvWbX2vVnXBbObj2OVZyOOSr4dVJWUgsjZ0B4gaVc.ttf') format('truetype');
  }

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

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

  .design-notice {
    position: fixed;
    bottom: 20px;
    right: 20px;
    background: rgba(0,0,0,0.7);
    color: var(--accent-gold);
    padding: 10px 15px;
    border-radius: 5px;
    font-size: 14px;
    z-index: 1000;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
  }

  .hero-section {
    height: 80vh;
    display: flex;
    align-items: center;
    justify-content: center;
    position: relative;
    overflow: hidden;
    padding: 0 5%;
  }

  .hero-content {
    position: relative;
    z-index: 2;
    text-align: center;
    max-width: 800px;
  }

  .hero-bg {
    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;
  }

  h1, h2, h3, h4 {
    font-family: 'Montserrat', sans-serif;
    color: var(--text-light);
    margin-bottom: 20px;
  }

  h1 {
    font-size: 3rem;
    background: linear-gradient(90deg, var(--accent-gold), var(--accent-orange));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    text-shadow: 0 2px 4px rgba(0,0,0,0.3);
  }

  h2 {
    font-size: 2.2rem;
    position: relative;
    display: inline-block;
    margin-top: 40px;
  }

  h2::after {
    content: '';
    position: absolute;
    bottom: -10px;
    left: 0;
    width: 100%;
    height: 3px;
    background: linear-gradient(90deg, var(--accent-orange), transparent);
  }

  h3 {
    font-size: 1.8rem;
    margin-top: 30px;
    color: var(--accent-gold);
  }

  p {
    margin-bottom: 20px;
    font-size: 1.1rem;
  }

  .container {
    max-width: 1200px;
    margin: 0 auto;
    padding: 40px 20px;
  }

  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
    gap: 30px;
    margin: 40px 0;
  }

  .card {
    background: var(--card-bg);
    border-radius: 15px;
    padding: 25px;
    box-shadow: 0 10px 20px rgba(0,0,0,0.2);
    transition: var(--transition);
    backdrop-filter: blur(5px);
    border: 1px solid rgba(255,255,255,0.1);
  }

  .card:hover {
    transform: translateY(-10px);
    box-shadow: 0 15px 30px rgba(0,0,0,0.3);
    border-color: var(--accent-orange);
  }

  .card-img {
    width: 100%;
    height: 200px;
    border-radius: 10px;
    object-fit: cover;
    margin-bottom: 20px;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: var(--transition);
  }

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

  code {
    background: rgba(0,0,0,0.3);
    color: var(--accent-gold);
    padding: 2px 5px;
    border-radius: 3px;
    font-family: monospace;
  }

  pre {
    background: rgba(0,0,0,0.5);
    padding: 20px;
    border-radius: 10px;
    overflow-x: auto;
    margin: 20px 0;
    border-left: 4px solid var(--accent-orange);
    font-size: 0.9rem;
    line-height: 1.5;
  }

  pre code {
    background: transparent;
    color: var(--text-light);
    padding: 0;
  }

  .nav-tabs {
    display: flex;
    gap: 10px;
    margin: 30px 0;
    flex-wrap: wrap;
  }

  .nav-tab {
    padding: 10px 20px;
    background: rgba(255,255,255,0.1);
    border-radius: 5px;
    color: var(--text-light);
    text-decoration: none;
    transition: var(--transition);
    font-family: 'Montserrat', sans-serif;
    font-size: 0.9rem;
  }

  .nav-tab:hover {
    background: var(--accent-orange);
    transform: translateY(-3px);
  }

  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin: 40px 0;
  }

  .gallery-img {
    width: 100%;
    height: 200px;
    border-radius: 10px;
    object-fit: cover;
    box-shadow: 0 5px 15px rgba(0,0,0,0.2);
    transition: var(--transition);
    filter: grayscale(20%);
  }

  .gallery-img:hover {
    transform: scale(1.05);
    filter: grayscale(0%);
    box-shadow: 0 10px 20px rgba(255,215,0,0.3);
  }

  @media (max-width: 768px) {
    h1 {
      font-size: 2.2rem;
    }
    h2 {
      font-size: 1.8rem;
    }
    .card-grid {
      grid-template-columns: 1fr;
    }
    .hero-section {
      height: 60vh;
    }
  }

  @media (max-width: 480px) {
    h1 {
      font-size: 1.8rem;
    }
    .container {
      padding: 20px 15px;
    }
  }

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

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

  @keyframes pulse {
    0%, 100% { opacity: 1; }
    50% { opacity: 0.5; }
  }

  .pulsing {
    animation: pulse 2s ease-in-out infinite;
  }