:root {
  color-scheme: light;
  font-family: Arial, Helvetica, sans-serif;
  font-size: 16px;
  line-height: normal;
}

* {
  box-sizing: border-box;
}

body {
  margin: 8px;
  background: #ffffff;
  color: #000000;
  font-family: Arial, Helvetica, sans-serif;
}

.page-header {
  margin-block: 1em;
}

h1,
h2 {
  color: #990000;
  font-weight: 700;
}

h1 {
  margin: 0;
  font-size: 18px;
}

.author {
  margin: 0;
  color: #990000;
  font-weight: 700;
}

h2 {
  margin-block: 1em;
  font-size: 16px;
}

p {
  margin-block: 1em;
}

.book-overview {
  display: flex;
  align-items: flex-start;
  gap: 60px;
}

.book-details {
  flex: 0 1 auto;
}

.contact-information {
  margin-block: 1em;
  font-style: normal;
}

.contact-information strong,
.contact-information span {
  display: block;
}

.contact-information span {
  margin-left: 40px;
}

.book-cover {
  flex: 0 0 250px;
  margin: 0;
}

.book-cover img {
  display: block;
  width: 250px;
  max-width: 100%;
  height: auto;
}

.download-links {
  margin-left: 40px;
}

.bvp-list {
  margin-left: 15px;
}

.bvp-entry {
  margin-block: 10px;
  padding: 5px;
}

.bvp-entry p:first-child {
  margin-top: 0;
}

.bvp-entry p:last-child {
  margin-bottom: 0;
}

.equation {
  white-space: normal;
}

@media (max-width: 640px) {
  .book-overview {
    flex-direction: column;
    gap: 1em;
  }

  .book-cover {
    flex-basis: auto;
  }
}