.header-v2 {
      background: url('https://www.transparenttextures.com/patterns/old-mathematics.png');
      background-color: #4a4a4a;
      padding: 25px 0;
      border-top: 6px double #ffce54;
      border-bottom: 6px double #ffce54;
      box-shadow: inset 0 0 15px rgba(0,0,0,0.5);
      position: relative;
    }
    .header-v2::before {
      content: "";
      position: absolute;
      left: 0;
      top: 0;
      width: 100%;
      height: 100%;
      background: linear-gradient(90deg, rgba(255,206,84,0.3), rgba(0,0,0,0));
      mix-blend-mode: overlay;
    }
    .header-v2 .logo img {
      max-height: 80px;
      border: 3px solid #ffce54;
      padding: 5px;
      border-radius: 10px;
      transition: transform 0.3s ease;
    }
    .header-v2 .logo img:hover {
      transform: scale(1.1);
    }
    .header-v2 .nav a {
      font-size: 19px;
      font-weight: 600;
      color: #ecf0f1;
      margin-right: 20px;
      padding: 10px 15px;
      background: rgba(0, 0, 0, 0.3);
      border-radius: 5px;
      transition: background 0.3s ease, transform 0.3s ease;
    }
    .header-v2 .nav a:hover {
      background: rgba(231, 76, 60, 0.8);
      transform: scale(1.1) translateY(-3px);
    }