{
  box-sizing: border-box;
}

body {
  margin: 0;
  padding: 0;
  font-family: "Helvetica Neue", Arial, sans-serif;
  line-height: 1.6;
  color: #333;
  background-color: #f7f6fa; /* soft neutral background */
}

/* Layout */
body {
  max-width: 800px;
  margin: 0 auto;
  padding: 3rem 1.5rem;
}

/* Headings */
h1 {
  font-size: 2.75rem;
  margin-bottom: 0.25rem;
  color: #400ef5; /* deep blue accent */
}

h2 {
  font-size: 1.25rem;
  font-weight: 400;
  margin-top: 0;
  margin-bottom: 2rem;
  color: #6e8ad6; /* lighter blue */
}

h3 {
  font-size: 1rem;
  font-weight: 400;
  margin-top: 0;
  margin-bottom: 2rem;
  color: #6e8ad6; /* lighter blue */
}

/* Body text */
p, ul {
  font-size: 1.05rem;
  background-color: #ffffff;
  padding: 1.75rem;
  border-radius: 8px;
  border-left: 6px solid #143db9; /* blue accent stripe */
  box-shadow: 0 4px 12px rgba(0, 0, 0, 0.05);
}

/* Optional: subtle emphasis for keywords later */
strong {
  color: #0a12e5;
}

/* Responsive tweaks */
@media (max-width: 600px) {
  h1 {
    font-size: 2.25rem;
  }

  h2 {
    font-size: 1.1rem;
  }

  body {
    padding: 2rem 1rem;
  }
}

slide-container {
    /* Optional: Hide the overflow so the text is initially off-screen */
    width: 100%;
    overflow: hidden; 
}

h1, h2, h3, p, img {
    /* Apply the animation to the H1 element */
    animation: slide-in 1s forwards; /* 2s duration, 'forwards' keeps it at the end state */
    transform: translateX(-100%); /* Start position: 100% off-screen to the left */
}

/* Define the animation named 'slide-in' */
@keyframes slide-in {
    to {
        transform: translateX(0); /* End position: original position (0 translation) */
    }
}

.fade-in {
    opacity: 0;
    transform: translateY(20px);
    transition: opacity 0.6s ease-out, transform 0.6s ease-out;
  }
  
  .fade-in.show {
    opacity: 1;
    transform: translateY(0);
  }

  .tab-buttons {
    display: flex;
    border-bottom: 2px solid #ccc;
    margin-bottom: 20px;
  }

  .tab-buttons button {
    padding: 10px 20px;
    cursor: pointer;
    border: none;
    background: none;
    font-size: 16px;
    border-bottom: 3px solid transparent;
    color: #6a91f4;
  }

  .tab-buttons button.active {
    border-bottom: 3px solid #1541d0;
    font-weight: bold;
    color: #2b28cb;
  }

  /* Tab content */
  .tab-content {
    display: none;
  }

  .tab-content.active {
    display: block;
  }