* { margin:0; padding:0; box-sizing:border-box; }
    body {
      font-family: 'Poppins', sans-serif;
      background: #f8f9fa;
      min-height: 100vh;
    }

    header {
      position: fixed;
      top: 0; left: 0; width: 100%;
      z-index: 1000;
      background: linear-gradient(135deg, #0a1d37 0%, #112b4e 100%);
      box-shadow: 0 4px 20px rgba(0,0,0,0.35);
    }

    nav {
      max-width: 1600px;
      margin: 0 auto;
      padding: 1.2rem 5vw;
      display: flex;
      justify-content: flex-end;
      align-items: center;
      flex-wrap: wrap;
      gap: 1rem;
    }

    .nav-links {
      list-style: none;
      display: flex;
      gap: 2.2rem;
      align-items: center;
      flex-wrap: wrap;
      justify-content: flex-end;
    }

    .nav-links li a {
      color: #e0e7ff;
      text-decoration: none;
      font-weight: 500;
      font-size: 1.08rem;
      padding: 0.9rem 1rem;
      position: relative;
      transition: all 0.4s cubic-bezier(0.4, 0, 0.2, 1);
      border-radius: 8px;
    }

    .nav-links li a:hover {
      color: #ffd700;
      transform: translateY(-4px);
      background: rgba(255,215,0,0.12);
      box-shadow: 0 8px 25px rgba(255,215,0,0.25);
    }

    .nav-links li a::after {
      content: '';
      position: absolute;
      width: 0;
      height: 3.5px;
      bottom: 0.4rem;
      left: 50%;
      background: #ffd700;
      box-shadow: 0 0 12px #ffd70080;
      transition: width 0.45s cubic-bezier(0.4, 0, 0.2, 1);
      transform: translateX(-50%);
      border-radius: 3px;
    }

    .nav-links li a:hover::after {
      width: 80%;
    }

    /* ================== MEGA MENU - DESKTOP & MOBILE FIXED ================== */
    .mega-menu-overlay {
      position: fixed;
      inset: 0;
      background: rgba(10, 29, 55, 0.94);
      backdrop-filter: blur(8px);
      z-index: 1999;
      opacity: 0;
      visibility: hidden;
      transition: opacity 0.4s ease;
    }

    .mega-menu-overlay.active {
      opacity: 1;
      visibility: visible;
    }

    .mega-menu {
      position: fixed;
      background: linear-gradient(145deg, #0f2b52, #1a3a68);
      overflow-y: auto;
      opacity: 0;
      visibility: hidden;
      transition: all 0.5s cubic-bezier(0.34, 1.56, 0.64, 1);
      z-index: 2000;
    }

    /* Desktop: Centered popup */
    @media (min-width: 1025px) {
      .mega-menu {
        top: 50%;
        left: 50%;
        transform: translate(-50%, -50%) scale(0.92);
        width: 92%;
        max-width: 1150px;
        max-height: 88vh;
        border-radius: 18px;
        padding: 3.5rem 4.5rem;
        box-shadow: 0 25px 90px rgba(0,0,0,0.75);
      }

      .mega-menu.active {
        opacity: 1;
        visibility: visible;
        transform: translate(-50%, -50%) scale(1);
      }
    }

    /* Mobile: Full screen */
    @media (max-width: 1024px) {
      .mega-menu {
        top: 0;
        left: 0;
        right: 0;
        bottom: 0;
        width: 100% !important;
        height: 100vh !important;
        transform: none !important;
        border-radius: 0 !important;
        padding: 6.5rem 1.5rem 4rem !important;
      }

      .mega-menu.active {
        opacity: 1;
        visibility: visible;
        transform: none !important;
      }
    }

    .close-btn {
      position: fixed;
      top: 1.2rem;
      right: 1.5rem;
      font-size: 3rem;
      color: #ffd700;
      background: none;
      border: none;
      cursor: pointer;
      z-index: 2001;
      transition: all 0.3s;
    }

    .close-btn:hover {
      color: white;
      transform: rotate(90deg) scale(1.2);
    }

    .mega-content {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
      gap: 2.8rem;
      max-width: 1000px;
      margin: 0 auto;
    }

    @media (max-width: 1024px) {
      .mega-content {
        grid-template-columns: 1fr;
        gap: 2.2rem;
      }
    }

    .mega-column h3 {
      color: #ffd700;
      font-size: 1.5rem;
      margin-bottom: 1.4rem;
      padding-bottom: 0.8rem;
      border-bottom: 3px solid rgba(255,215,0,0.45);
    }

    .mega-column ul { list-style: none; }
    .mega-column li { margin-bottom: 1.1rem; }
    .mega-column a {
      color: #e0e7ff;
      text-decoration: none;
      font-size: 1.1rem;
      display: block;
      padding: 1rem 1.3rem;
      border-radius: 12px;
      transition: all 0.3s;
    }

    .mega-column a:hover {
      background: rgba(255,215,0,0.18);
      color: #ffd700;
      transform: translateX(12px);
    }

    /* Hamburger */
    .hamburger {
      display: none;
      flex-direction: column;
      gap: 7px;
      cursor: pointer;
    }

    .hamburger span {
      width: 32px;
      height: 4px;
      background: #ffd700;
      border-radius: 4px;
      transition: all 0.4s;
    }

    @media (max-width: 1024px) {
      nav {
        padding: 1.2rem 2.5rem;
        justify-content: space-between;
      }

      .nav-links {
        position: fixed;
        top: 0; right: -100%;
        width: 100%;
        height: 100vh;
        background: linear-gradient(135deg, #0a1d37, #1e3a5f);
        flex-direction: column;
        align-items: center;
        justify-content: center;
        gap: 2.5rem;
        transition: right 0.5s ease;
        z-index: 1500;
      }

      .nav-links.active { right: 0; }

      .hamburger { display: flex; }
    }

    .hamburger.active span:nth-child(1) { transform: rotate(45deg) translate(9px,9px); }
    .hamburger.active span:nth-child(2) { opacity: 0; }
    .hamburger.active span:nth-child(3) { transform: rotate(-45deg) translate(8px,-8px); }

    main {
      padding-top: 140px;
      text-align: center;
    }