body {
      margin: 0;
      font-family: "Segoe UI", Tahoma, sans-serif;
      line-height: 1.6;
      color: #222;
      background: #fff;
    }

    /* Base header */
    header {
      position: relative;
      background: linear-gradient(135deg, #1473e6, #0a2540);
      color: #fff;
      min-height: 40vh; /* ensure tall banner (80% of viewport height) */
      padding: 2rem 1rem; /* just top padding for logo/nav */
      text-align: center;
      overflow: hidden;
    }

    header h1 {
      position: relative;
      z-index: 1;
      margin: 0 0 1rem;
      font-size: 2.5rem;
    }

    header p {
      position: relative;
      z-index: 1;
      margin-bottom: 1.5rem;
      font-size: 1.2rem;
    }

    .header-bar {
      position: relative;
      z-index: 2;
      display: flex;
      justify-content: space-between;
      align-items: center;
      padding: 0 1rem;
    }

    .logo {
      max-width: min(275px, 60%);
      width: 100%;
      height: auto;
    }

    .nav a {
      margin: 0 1rem;
      text-decoration: none;
      color: #fff;
      font-size: 1.1rem;
      font-weight: 600;
    }

    /* Hamburger button hidden by default */
    .menu-toggle {
      display: none;
      position: relative;
      z-index: 2;
      border: none;
      background: none;
      cursor: pointer;
      color: #fff;
      font-size: 2rem;
    }

    /* Hero */
    .hero {
      margin-top: 2rem;
      text-align: center;
    }

    /* --- Mobile styles --- */
    @media (max-width: 768px) {
      .menu-toggle {
        display: block; /* show hamburger */
      }

      .nav {
        display: none; /* hide menu by default */
        pointer-events: none; /* not clickable when hidden */
        position: absolute;
        top: 100%;
        right: 0;
        left: 0;
        flex-direction: column;
        align-items: center;
        padding: 1rem 0;
        background: rgba(0, 0, 0, 0.8);
      }

      .nav.show {
        display: flex; /* show when active */
        pointer-events: auto; /* clickable only when visible */
      }

      .nav a {
        margin: 0.5rem 0;
        font-size: 1rem;
      }

      .hero {
        margin-top: 3rem;
        padding: 0 1rem;
      }

      .hero h1 {
        font-size: 1.4rem;
      }

      .hero p {
        font-size: 1rem;
      }
    }
    
    .btn {
      display: inline-block;
      padding: 0.75rem 1.5rem;
      background: #fff;
      color: #0a2540;
      border-radius: 5px;
      font-weight: bold;
      text-decoration: none;
      z-index: 1;
      position: relative;
    }

    /* Background nodes animation */
    .nodes {
      position: absolute;
      inset: 0;
      z-index: 0;
      background: radial-gradient(rgba(255, 255, 255, 0.1) 2px, transparent 3px);
      background-size: 50px 50px;
      animation: moveNodes 20s linear infinite;
    }

    @keyframes moveNodes {
      from {
        background-position: 0 0;
      }

      to {
        background-position: 100px 100px;
      }
    }

    section {
      padding: 2rem 1rem;
      max-width: 1000px;
      margin: auto;
      position: relative;
    }

    section h2 {
      text-align: center;
      margin-bottom: 2rem;
      font-size: 2rem;
      color: #0a2540;
    }

    #about p {
      text-align: justify;
    }

    .divider {
      height: 40px;
      background: url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="100%" height="40"><path d="M0 20 Q50 0 100 20 T200 20 T300 20 T400 20 V40 H0 Z" fill="%23f9f9f9"/></svg>') repeat-x;
      background-size: cover;
    }

    .grid {
      display: grid;
      gap: 1.5rem;
    }

    .grid-2 {
      grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    }

    .card {
      padding: 1.5rem;
      border: 1px solid #ddd;
      border-radius: 10px;
      background: #f9f9f9;
      text-align: center;
      transition: transform 0.2s;
    }

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

    .card svg {
      width: 40px;
      height: 40px;
      margin-bottom: 1rem;
      fill: #1473e6;
    }

    form {
      max-width: 500px;
      margin: auto;
      display: grid;
      gap: 1rem;
    }

    input,
    textarea {
      padding: 0.75rem;
      border: 1px solid #ccc;
      border-radius: 5px;
      width: 100%;
    }

    button {
      padding: 0.75rem;
      background: #1473e6;
      color: #fff;
      border: none;
      border-radius: 5px;
      cursor: pointer;
    }

    footer {
      background: #0a2540;
      color: #fff;
      text-align: center;
      padding: 2rem 1rem;
    }

    footer a {
      color: #fff;
      margin: 0 0.5rem;
      text-decoration: none;
    }

    footer small {
      display: block;
      margin-top: 1rem;
      font-size: 0.85rem;
    }
\