:root {
      --background-color: #000;
      --default-color: #fafafa;
      --heading-color: #ffffff;
      --accent-color: #ff0000;
      --surface-color: #1a1a1a;
      --contrast-color: #000000;
    }
    /* Reset básico */
    *, *::before, *::after {
      box-sizing: border-box;
    }
    body {
      font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen,
        Ubuntu, Cantarell, "Open Sans", "Helvetica Neue", sans-serif;
      line-height: 1.6;
      margin: 0;
      background-color: var(--background-color);
      color: var(--default-color);
      padding: 20px;
      max-width: 900px;
      margin-left: auto;
      margin-right: auto;
      -webkit-font-smoothing: antialiased;
      -moz-osx-font-smoothing: grayscale;
    }
    h1, h2, h3 {
      color: var(--heading-color);
      margin-top: 1.5em;
      margin-bottom: 0.5em;
      font-weight: 700;
    }
    h1 {
      font-size: 2.4rem;
      margin-top: 0;
    }
    p, li {
      margin-bottom: 1em;
      color: var(--default-color);
      font-size: 1rem;
    }
    ul {
      margin-left: 1.5em;
      margin-bottom: 1em;
      list-style-type: disc;
    }
    nav {
      background-color: var(--surface-color);
      padding: 12px 20px;
      margin-bottom: 30px;
      border-radius: 8px;
      display: flex;
      gap: 15px;
      flex-wrap: wrap;
      justify-content: center;
    }
    nav a {
      color: var(--accent-color);
      text-decoration: none;
      font-weight: 600;
      font-size: 1rem;
      transition: color 0.3s ease;
    }
    nav a[aria-current="page"] {
      color: var(--default-color);
      font-weight: 700;
      cursor: default;
    }
    nav a:hover:not([aria-current="page"]) {
      color: var(--default-color);
      text-decoration: underline;
    }
    @media (max-width: 600px) {
      body {
        padding: 15px 10px;
      }
      nav {
        justify-content: center;
      }
      nav a {
        font-size: 0.9rem;
      }
    }