:root {
  --navy: #13334f;
  --ink: #1d2733;
  --teal: #017b86;
  --teal-dark: #015e66;
  --blue: #1e8bc3;
  --cream: #f7eee3;
  --card: #ffffff;
  --muted: #55606d;
  --rule: #e3d8ca;
}
* { box-sizing: border-box; }
html { font-size: 19px; }
body {
  margin: 0;
  background: var(--cream);
  color: var(--ink);
  font-family: Georgia, "Times New Roman", serif;
  line-height: 1.6;
}
.sans, h1, h2, h3, .btn, nav, label, .small, footer {
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
a { color: var(--teal-dark); }
.wrap { max-width: 760px; margin: 0 auto; padding: 0 20px; }
header.top {
  background: var(--navy);
  color: #fff;
  padding: 14px 0;
}
header.top .wrap { display: flex; align-items: center; justify-content: space-between; gap: 12px; flex-wrap: wrap; }
header.top a { color: #fff; text-decoration: none; font-weight: 800; letter-spacing: .06em; font-size: .8rem; text-transform: uppercase; }
header.top nav a { font-weight: 600; letter-spacing: 0; text-transform: none; font-size: .9rem; margin-left: 18px; opacity: .9; }
main { padding: 36px 0 56px; }
h1 { font-size: 2.1rem; line-height: 1.15; color: var(--navy); margin: 0 0 14px; letter-spacing: -.01em; }
h2 { font-size: 1.35rem; color: var(--navy); margin: 34px 0 10px; }
.lead { font-size: 1.12rem; }
.card {
  background: var(--card);
  border: 1px solid var(--rule);
  border-radius: 14px;
  padding: 26px;
  margin: 24px 0;
  box-shadow: 0 2px 10px rgba(19, 51, 79, .06);
}
.btn {
  display: inline-block;
  background: var(--teal);
  color: #fff;
  font-weight: 700;
  font-size: 1.05rem;
  padding: 16px 26px;
  border-radius: 10px;
  text-decoration: none;
  border: 0;
  cursor: pointer;
}
.btn:hover, .btn:focus { background: var(--teal-dark); }
.btn.secondary { background: var(--navy); }
ul.checks { list-style: none; padding: 0; margin: 12px 0 0; }
ul.checks li { padding-left: 32px; position: relative; margin-bottom: 8px; }
ul.checks li::before { content: "\2713"; position: absolute; left: 4px; color: var(--teal); font-weight: 700; }
.book { display: flex; gap: 26px; align-items: flex-start; flex-wrap: wrap; }
.book img { width: 190px; max-width: 45%; border-radius: 6px; box-shadow: 0 6px 18px rgba(0,0,0,.18); }
.book .info { flex: 1; min-width: 240px; }
.small { font-size: .85rem; color: var(--muted); }
form.signup { display: flex; gap: 10px; flex-wrap: wrap; margin-top: 12px; }
form.signup input[type=email] {
  flex: 1; min-width: 220px;
  font-size: 1.05rem; padding: 15px 14px;
  border: 2px solid var(--rule); border-radius: 10px;
  font-family: inherit;
}
form.signup input[type=email]:focus { outline: none; border-color: var(--teal); }
.hp { position: absolute; left: -5000px; width: 1px; height: 1px; overflow: hidden; }
.msg { margin-top: 12px; font-weight: 600; }
.msg.ok { color: var(--teal-dark); }
.msg.err { color: #a12a2a; }
footer { border-top: 1px solid var(--rule); padding: 22px 0 40px; font-size: .8rem; color: var(--muted); }
@media (max-width: 520px) {
  html { font-size: 18px; }
  h1 { font-size: 1.7rem; }
  .card { padding: 20px; }
  .btn { width: 100%; text-align: center; }
  .book img { max-width: 60%; margin: 0 auto; }
}