:root {
      --primary-color: #05326d;
      --highlight-color: #00a46a;
      --light-blue: #c3dcfc;
      --text-color: rgba(0, 0, 0, 0.9);
    }

    * {
      box-sizing: border-box;
    }

    body {
      margin: 0;
      font-family: 'Lato', sans-serif;
      font-size: 16px;
      line-height: 1.4;
      color: var(--text-color);
      text-wrap: pretty;
    }

    h1 {
      font-size: 3rem;
      color: var(--primary-color);
    }

    h2 {
      font-size: 1.5rem;
      color: var(--primary-color);
      margin-top: 2rem;
      margin-bottom: 0;
    }

    p {
      margin: 1rem 0;
    }

    a {
      color: var(--primary-color);
      text-decoration: none;
      font-weight: 600;
    }

    main a:hover,
    footer a:hover {
      text-decoration: underline;
    }

    /* 1. Skip Link for keyboard navigation */
    .skip-link {
      position: absolute;
      top: -3rem;
      /* Hidden off-screen by default */
      left: 1rem;
      background: #000;
      color: #fff;
      padding: 0.5rem 1rem;
      z-index: 1000;
      transition: top 0.3s ease-in-out;
      text-decoration: none;
    }

    .skip-link:focus {
      top: 1rem;
      /* Becomes visible on focus */
    }

    /* 2. Visually Hidden class for screen reader text */
    .visually-hidden {
      position: absolute !important;
      width: 1px !important;
      height: 1px !important;
      padding: 0 !important;
      margin: -1px !important;
      overflow: hidden !important;
      clip: rect(0, 0, 0, 0) !important;
      white-space: nowrap !important;
      border: 0 !important;
    }

    /* --- Header & Navigation Layout --- */

    .main-header {
      display: flex;
      justify-content: space-between;
      align-items: baseline;
      min-height: 80px;
      padding: 1rem 0;
      background-color: var(--primary-color);
      border-bottom: 2px solid var(--highlight-color);
      position: sticky;
      top: 0;
      z-index: 999;
    }

    .logo img {
      height: 36px;
      width: auto;
      display: block;
    }

    /* --- Desktop Navigation --- */

    .header-inner {
      max-width: 800px;
      padding: 0 2rem;
      margin: 0 auto;
      width: 100%;
      display: flex;
      justify-content: space-between;
      align-items: baseline;
    }

    .main-nav ul {
      display: flex;
      gap: 2rem;
      list-style: none;
      font-size: 1.25rem;
      margin: 0;
      padding: 0;
    }

    .main-nav a {
      color: white;
      font-weight: 500;
      position: relative;
      display: inline-block;
    }

    .main-nav a::after {
      content: '';
      position: absolute;
      bottom: 0;
      left: 0;
      width: 0;
      height: 2px;
      background-color: white;
      transition: width 0.3s ease;
    }

    .main-nav a:hover::after,
    .main-nav a:focus::after {
      width: 100%;
    }

    /* --- Hamburger Toggle Button --- */

    .nav-toggle {
      display: none;
      background: none;
      border: none;
      cursor: pointer;
      padding: 0;
      z-index: 1000;
    }

    .hamburger-icon {
      width: 30px;
      height: 22px;
      display: flex;
      flex-direction: column;
      justify-content: space-between;
    }

    .hamburger-icon span {
      display: block;
      width: 100%;
      height: 3px;
      background-color: white;
      border-radius: 2px;
      transition: transform 0.3s, opacity 0.3s;
    }

    /* Animate hamburger to "X" when open */
    .nav-toggle.is-open .hamburger-icon span:nth-child(1) {
      transform: translateY(9.5px) rotate(45deg);
    }

    .nav-toggle.is-open .hamburger-icon span:nth-child(2) {
      opacity: 0;
    }

    .nav-toggle.is-open .hamburger-icon span:nth-child(3) {
      transform: translateY(-9.5px) rotate(-45deg);
    }

    /* --- Focus Indication --- */

    .nav-toggle:focus-visible,
    .main-nav a:focus-visible,
    .skip-link:focus-visible,
    .logo a:focus-visible {
      outline: 3px solid var(--primary-color);
      outline-offset: 3px;
      border-radius: 2px;
    }

    /* Content */
    main {
      max-width: 800px;
      padding: 2rem 2rem;
      margin: 0 auto;
      text-align: left;
    }

    /* Footer */
    footer {
      background: var(--light-blue);
      border-top: 2px solid var(--primary-color);
    }

    .footer-inner {
      max-width: 800px;
      margin: 0 auto;
      padding: 1rem 2rem;
      font-size: 1rem;
    }





    /* Mobile */
    @media (max-width: 768px) {
      .nav-toggle {
        display: block;
        align-self: flex-end;
      }

      .main-header {
        align-items: baseline;
      }

      .main-nav {
        display: none;
        position: absolute;
        top: 100%;
        left: 0;
        right: 0;
        background-color: white;
        flex-direction: column;
        border-bottom: 2px var(--highlight-color) solid;
      }

      .main-nav.is-open {
        display: flex;
      }

      .main-nav ul {
        flex-direction: column;
        gap: 0.5rem;
        padding-left: 2rem;
        align-items: flex-start;
      }

      .main-nav a {
        padding: 0.5rem 0;
        color: var(--primary-color);
        width: 100%;
      }

      .main-nav a::after {
        content: none;
      }
    }