* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
   
  /** COLOR VARIABLES */
  :root {
    --black: #000;
    --gold: #ffd700;
    --dark-gold: #d1b410;
    --light-gold: rgba(255, 215, 0, 0.5)
  }

  
  /** HEADER + NAV STYLING */
  header {
    background-color: var(--black);
    position: sticky;
    top: 0;
    z-index: 999;
  }

  .banner {
    display: flex;
    justify-content: space-between; max-width: 60%;
    align-items: center;

    height: 4.5rem;

    margin: 0 auto;
    padding: 1rem 0;
  }
               
  .logo {
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--gold);
    text-decoration: none;
  }

  #hamburger {
    display: none;
    flex-direction: column;
    cursor: pointer;
    background: none;
    border: none;
    padding: 5px;
  }

  #hamburger span {
    width: 25px;
    height: 3px;
    background-color: var(--gold);
    margin: 3px 0;
    transition: 0.3s;
    position: relative;
  }

  .navLink {
    color: var(--gold);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.3s ease;
  }

  .navLink:hover {
    color: #fff;
  }

  /** BODY + CONTENT */
  body {
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu,
      Cantarell, sans-serif;
    line-height: 1.6;
    color: #666;
    background-color: var(--black);
  }

  main {
    /** background-color: #fff;*/
    background-color: var(--black);
  }

  section {
    display: flex;
    flex-direction: column;
    justify-content: center;
    max-width: 60%;
    margin: 0 auto;
    padding: 3rem 0;
  }

  #book-button {
    background-color: var(--gold);
    color: black;
    border: none;
    border-radius: 5rem;

    box-shadow: 0px 1px 75px rgba(255, 255, 255, 0.5);

    padding: 2rem 0;
    margin: 5rem 0;

    height: 7rem; 

    font-size: 2rem;
    font-weight: bold;
    text-decoration: none;
  }
  #book-button:hover {
    cursor: pointer;
  }
  #book-button:active {
    background-color: var(--dark-gold);
  }
  
  a {
    color: var(--gold);
    text-align: center;
  }

  h1 {
    font-size: 2.5rem;
    color: #fff;
    margin-bottom: 1rem;
    text-align: center;
  }

  h2 {
    font-size: 2rem;
    color: var(--gold);
    margin-bottom: 1rem;
    border-bottom: 2px solid var(--gold);
    padding-bottom: 0.5rem;
  }

  h3 {
    font-size: 1.5rem;
    color: #000;
    margin-bottom: 1rem;
  }

  p {
    color: #fff;
    margin-bottom: 1rem;
  }

  /** FOOTER */
  footer {
    display: flex;
    justify-content: space-between;

    margin: 1rem auto;
    padding: 2rem 0;

    max-width: 60%;

    background-color: #000;
    color: var(--gold);

    text-align: center;
  }

  #footer-left {
    width: 50%;
    text-align: left;
  }
  #footer-right {
    width: 50%;
    text-align: right;
  }

  /** "skip link" for screen readers */
  .skipLink {
    position: absolute;
    top: -50px;
    left: 6px;
    background: #fff;
    color: #000;
    padding: 8px;
    text-decoration: none;
    font-weight: bold;
    border-radius: 4px;
    z-index: 1000;
  }
  .skipLink:focus {
    top: 6px;
  }

  /** DESKTOP RULES */
  @media screen and (min-width: 851px) {
    /** header */
    nav {
      display: flex;
      flex-direction: row;
      gap: 3rem;

      list-style: none;
    }

    /** content */
    h1 {
      font-size: 3rem;
    }

    #book-button {
      width: 50%;
    }
  }

  /* MOBILE RULES */
  @media screen and (max-width: 850px) {
    /** header */
    header {
      padding: 0 1rem;
    }

    #hamburger {
      display: flex;
    }

    nav {
      display: flex;
      flex-direction: column;
      position: fixed;
      gap: 1rem;

      padding: 2rem 0;

      top: -12rem;
      left: 0;
      width: 100%;

      font-size: 1rem;
      text-align: center;
      background-color: #000;
      transition: top 0.5s ease;
      box-shadow: 0 10px 27px rgba(0, 0, 0, 0.05);
      z-index: -1;
    }

    nav.active {
      top: 1.5rem;
    }

    /** hamburger animation */
    #hamburger.active span:nth-child(1) {
      transform: rotate(-45deg) translateY(10px) translateX(-3px);
      width: 24px;
      height: 4px;
    }
    #hamburger.active span:nth-child(2) {
       opacity: 0;
    }
    #hamburger.active span:nth-child(3) {
      transform: rotate(45deg) translateY(-10px) translateX(-3px);
      width: 24px;
      height: 4px;
    }

    /** footer */
    footer {
      font-size: .9rem;
    }

    /** content rules */
    h1 {
      font-size: 2rem;
    }

    #book-button {
      font-size: 1.75rem;
      width: 85%;
    }
  }