:root {
  --header-bg: #000;
  --header-fg: #fff;
  --text: #222;
  --muted: #444;
  --heading: #226e93;
  --link: #226e93;
  --max-width: 720px;
}

*,
*::before,
*::after {
  box-sizing: border-box;
}

html {
  font-size: 16px;
}

body {
  margin: 0;
  font-family: Lato, Helvetica, Arial, sans-serif;
  color: var(--text);
  background: #fff;
  line-height: 1.55;
}

a {
  color: var(--link);
}

a:hover {
  text-decoration: underline;
}

.site-header {
  background: var(--header-bg);
  color: var(--header-fg);
  padding: 0.85rem 1.25rem;
}

.site-title {
  color: var(--header-fg);
  text-decoration: none;
  font-weight: 400;
  font-size: 1.05rem;
}

.site-title:hover {
  text-decoration: none;
  opacity: 0.9;
}

.site-main {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 1.5rem 1.25rem 2.5rem;
}

.site-footer {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem 2.5rem;
  color: var(--muted);
  font-size: 0.95rem;
}

.hero {
  text-align: center;
  margin-bottom: 2rem;
}

.hero-photo {
  display: block;
  width: min(100%, 420px);
  height: auto;
  margin: 0 auto 1.25rem;
}

.hero h1 {
  margin: 0 0 0.4rem;
  font-size: 1.35rem;
  font-weight: 700;
}

.hero .role {
  margin: 0 0 0.5rem;
  font-size: 1.05rem;
  font-weight: 700;
}

.hero .topics {
  margin: 0 0 0.5rem;
  font-style: italic;
  color: var(--muted);
}

.hero .tagline {
  margin: 0;
  font-weight: 700;
}

h2 {
  color: var(--heading);
  font-size: 1.4rem;
  font-weight: 400;
  margin: 2rem 0 0.75rem;
}

h3 {
  color: var(--heading);
  font-size: 1.1rem;
  font-weight: 400;
  margin: 1.25rem 0 0.5rem;
}

p {
  margin: 0 0 1rem;
}

ul {
  margin: 0 0 1rem;
  padding-left: 1.25rem;
}

li {
  margin-bottom: 0.35rem;
}

.book {
  display: flex;
  gap: 1.25rem;
  align-items: flex-start;
  margin: 1rem 0 1.5rem;
}

.book-cover {
  width: 160px;
  max-width: 40%;
  height: auto;
  flex-shrink: 0;
}

.book-meta {
  flex: 1;
  min-width: 0;
}

.book-meta .title {
  font-weight: 700;
  margin-bottom: 0.35rem;
}

.book-meta .details {
  color: var(--muted);
  margin-bottom: 0.75rem;
}

.buy-links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem 0.75rem;
  list-style: none;
  padding: 0;
  margin: 0.75rem 0 0;
}

.buy-links li {
  margin: 0;
}

@media (max-width: 560px) {
  .book {
    flex-direction: column;
    align-items: center;
    text-align: center;
  }

  .book-cover {
    max-width: 200px;
    width: 100%;
  }

  .buy-links {
    justify-content: center;
  }
}