:root {
    --primary: linear-gradient(135deg, #4facfe 0%, #00f2fe 100%);
    --secondary: #f5f5f5;
    --accent: #ffeb3b;
    --text: #333;
    --light: #fff;
    --shadow: 0 4px 20px rgba(0,0,0,0.1);
    --radius: 12px;
    --transition: all 0.3s ease;
  }

  * {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Roboto', sans-serif;
  }

  body {
    background: var(--secondary);
    color: var(--text);
    line-height: 1.6;
    padding-top: 80px;
    max-width: 1200px;
    margin: 0 auto;
    padding-bottom: 60px;
  }

  .header-banner {
    background: var(--primary);
    color: var(--light);
    padding: 40px;
    border-radius: var(--radius);
    margin: 20px;
    box-shadow: var(--shadow);
    position: relative;
    overflow: hidden;
  }

  .header-banner::after {
    content: "";
    position: absolute;
    top: -50%;
    left: -50%;
    width: 200%;
    height: 200%;
    background: radial-gradient(circle, rgba(255,255,255,0.1) 0%, transparent 70%);
    transform: rotate(30deg);
    pointer-events: none;
  }

  h1, h2, h3, h4 {
    margin: 1.5em 0 0.8em;
    line-height: 1.3;
    position: relative;
  }

  h2 {
    font-size: 2rem;
    color: #4facfe;
    padding-bottom: 10px;
    border-bottom: 2px solid rgba(79,172,254,0.2);
  }

  h3 {
    font-size: 1.6rem;
    color: #00a8ff;
  }

  p {
    margin-bottom: 1.5em;
    font-size: 1.1rem;
  }

  .nav-tabs {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    background: var(--light);
    box-shadow: 0 2px 15px rgba(0,0,0,0.1);
    z-index: 1000;
    display: flex;
    justify-content: center;
    padding: 15px 0;
  }

  .tab {
    padding: 10px 25px;
    margin: 0 10px;
    cursor: pointer;
    border-radius: 30px;
    transition: var(--transition);
    font-weight: 500;
    position: relative;
    overflow: hidden;
  }

  .tab::before {
    content: "";
    position: absolute;
    bottom: 0;
    left: 50%;
    transform: translateX(-50%);
    width: 0;
    height: 3px;
    background: var(--accent);
    transition: var(--transition);
  }

  .tab:hover {
    color: #4facfe;
  }

  .tab:hover::before {
    width: 80%;
  }

  .tab.active {
    color: #4facfe;
    font-weight: 600;
  }

  .tab.active::before {
    width: 80%;
  }

  .content-section {
    background: var(--light);
    border-radius: var(--radius);
    padding: 30px;
    margin: 20px;
    box-shadow: var(--shadow);
    transition: var(--transition);
  }

  .content-section:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 25px rgba(0,0,0,0.15);
  }

  .card-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin: 30px 0;
  }

  .card {
    background: var(--light);
    border-radius: var(--radius);
    padding: 25px;
    box-shadow: var(--shadow);
    transition: var(--transition);
    position: relative;
    overflow: hidden;
  }

  .card::before {
    content: "";
    position: absolute;
    top: 0;
    left: 0;
    width: 4px;
    height: 100%;
    background: var(--primary);
    transition: var(--transition);
  }

  .card:hover {
    transform: translateY(-5px);
  }

  .card:hover::before {
    width: 8px;
  }

  .highlight-box {
    background: rgba(255,235,59,0.2);
    border-left: 4px solid var(--accent);
    padding: 20px;
    margin: 25px 0;
    border-radius: 0 var(--radius) var(--radius) 0;
  }

  pre {
    background: #2d2d2d;
    color: #f8f8f2;
    padding: 20px;
    border-radius: var(--radius);
    overflow-x: auto;
    margin: 25px 0;
    font-size: 0.95rem;
    line-height: 1.5;
    position: relative;
  }

  pre::before {
    content: "CSS";
    position: absolute;
    top: 0;
    right: 0;
    background: #4facfe;
    color: white;
    padding: 5px 15px;
    border-radius: 0 var(--radius) 0 var(--radius);
    font-size: 0.8rem;
    font-weight: bold;
  }

  code {
    font-family: 'Courier New', monospace;
    background: rgba(0,0,0,0.05);
    padding: 2px 5px;
    border-radius: 3px;
    font-size: 0.95rem;
  }

  table {
    width: 100%;
    border-collapse: collapse;
    margin: 30px 0;
    box-shadow: var(--shadow);
    border-radius: var(--radius);
    overflow: hidden;
  }

  th, td {
    padding: 15px;
    text-align: left;
    border-bottom: 1px solid #eee;
  }

  th {
    background: #4facfe;
    color: white;
    font-weight: 500;
  }

  tr:nth-child(even) {
    background: #f9f9f9;
  }

  tr:hover {
    background: #f0f0f0;
  }

  .image-gallery {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 20px;
    margin: 30px 0;
  }

  .gallery-img {
    border-radius: var(--radius);
    overflow: hidden;
    box-shadow: var(--shadow);
    transition: var(--transition);
    aspect-ratio: 1/1;
  }

  .gallery-img img {
    width: 100%;
    height: 100%;
    object-fit: cover;
    transition: var(--transition);
  }

  .gallery-img:hover {
    transform: translateY(-5px);
    box-shadow: 0 10px 25px rgba(0,0,0,0.2);
  }

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

  .notice {
    background: rgba(79,172,254,0.1);
    border-left: 4px solid #4facfe;
    padding: 15px;
    margin: 30px 0;
    border-radius: 0 var(--radius) var(--radius) 0;
    font-size: 0.95rem;
  }

  @media (max-width: 768px) {
    body {
      padding-top: 70px;
    }
    
    .nav-tabs {
      flex-wrap: wrap;
      padding: 10px;
    }
    
    .tab {
      padding: 8px 15px;
      margin: 5px;
      font-size: 0.9rem;
    }
    
    .content-section {
      padding: 20px;
      margin: 10px;
    }
    
    h2 {
      font-size: 1.6rem;
    }
    
    h3 {
      font-size: 1.3rem;
    }
    
    .card-grid {
      grid-template-columns: 1fr;
    }
    
    .image-gallery {
      grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    }
  }

  @keyframes float {
    0% { transform: translateY(0px); }
    50% { transform: translateY(-10px); }
    100% { transform: translateY(0px); }
  }

  .floating {
    animation: float 3s ease-in-out infinite;
  }

  .tech-badge {
    display: inline-block;
    background: #4facfe;
    color: white;
    padding: 5px 15px;
    border-radius: 20px;
    margin: 5px;
    font-size: 0.8rem;
    font-weight: 500;
  }