:root {
  --red: #A1001C;
  --gray-dark: #212529;
  --gray-light: #F8F9FA;
  --gray-light-extra: #fff;
  --gray-meduim: #dee2e6;
}
body {
  font-family: 'Roboto', sans-serif;
  background-color: var(--gray-light);
  color: var(--gray-dark);
  margin: 0;
  padding: 0;
}
header {
  background-color: var(--gray-light-extra);
  border-bottom: 1px solid var(--gray-meduim);
  padding: 1rem 2rem;
  display: flex;
  justify-content: space-between;
  align-items: center;
}
.site-name {
  font-size: 1.5rem;
  color: var(--red);
  font-weight: bold;
}
.site-name a:hover {
  text-decoration: underline;
}
.header-links a {
  margin-left: 1rem;
  text-decoration: none;
  color: var(--gray-dark);
}
.header-links a:hover {
  color: var(--red);
}
.header-links-selected {
  text-decoration: none;
  color: var(--red);
}
.main-title {
  text-align: center;
  font-size: 2rem;
  margin: 2rem 0 1rem;
  color: var(--gray-dark);
}
.transformation-section {
  display: flex;
  justify-content: center;
  align-items: center;
  flex-wrap: wrap;
  padding: 2rem;
  gap: 2rem;
}
.transformation-box {
  width: 320px;
  text-align: center;
}
.transformation-box h2 {
  color: var(--red);
  font-size: 1.5rem;
  margin-bottom: 0.5rem;
}
.transformation-box p {
  font-style: italic;
  color: var(--gray-dark);
  font-size: 1.25rem;
}
.transformation-box ul {
  color: var(--gray-dark); 
  list-style-type:none;
  list-style-position: inside; 
  padding-left: 0;
}
.avisrubra-image {
  width: 100px;
  height: auto;
}
@media (max-width: 768px) {
  .transformation-section {
    flex-direction: column;
  }
  .avisrubra-image {
    margin: 1rem 0;
  }
}
.qa-section{
  color: var(--gray-dark); 
  background-color: var(--gray-light-extra);
  border-top: 1px solid var(--gray-meduim);
  margin: 1rem auto;
  padding: 0 1rem;
  text-align: center;
}
.qa-title {
  text-align: center;
  font-size: 1.5rem;
  margin-bottom: 1.25rem;
} 
  .qa-nav {
    display: grid;
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: .75rem;
    justify-items: center;
    margin: 0 auto 2rem;
    max-width: 900px;
  }
  .qa-btn {
    display: inline-block;
    padding: .75rem 1rem;
    border-radius: 999px;
    border: 1px solid var(--gray-dark);
    text-decoration: none;
    font-weight: 600;
    transition: transform .08s ease, background-color .2s ease, border-color .2s ease;
    color: var(--gray-light-extra);
    background: var(--red);
  }
  .qa-btn:hover, .qa-btn:focus {
    background: var(--gray-meduim);
    border-color: var(--gray-dark);
    transform: translateY(-1px);
  }

  .qa-category {
    margin: 2.5rem auto 3.25rem;
    text-align: left;                /* readable blocks */
    max-width: 900px;
  }
  .qa-category-title {
    font-size: clamp(1.25rem, 2vw, 1.5rem);
    margin: 0 0 1rem 0;
    text-align: center;
  }

  /* details/summary styles for accessible accordions */
  .qa-item {
    border: 1px solid var(--gray-meduim);
    border-radius: .75rem;
    background: var(--gray-light-extra);
    margin: .6rem 0;
    overflow: hidden;
  }
  .qa-item > summary {
    list-style: none;                 /* hide default marker */
    cursor: pointer;
    padding: 1rem 1.25rem;
    font-weight: 600;
    position: relative;
  }
  .qa-item > summary::-webkit-details-marker { display: none; }

  /* custom chevron */
  .qa-item > summary::after {
    content: "▸";
    position: absolute;
    right: 1rem;
    top: 50%;
    transform: translateY(-50%) rotate(0deg);
    transition: transform .15s ease;
  }
  .qa-item[open] > summary::after {
    transform: translateY(-50%) rotate(90deg);
  }

  .qa-a {
    padding: 0 1.25rem 1rem 1.25rem;
    color: var(--gray-dark);
    line-height: 1.6;
  }

  .qa-backtop {
    text-align: right;
    margin-top: .75rem;
  }
  .qa-toplink {
    text-decoration: none;
    font-size: .95rem;
  }
  .qa-toplink:hover { text-decoration: underline; }

  /* Responsive tweaks */
  @media (max-width: 640px) {
    .qa-nav { grid-template-columns: 1fr; }
  }