:root {
  --navy: #1f3a5f;
  --navy-dark: #152a45;
  --ink: #1d2330;
  --muted: #5b6475;
  --rule: #dde2ea;
  --bg: #ffffff;
  --tint: #f4f6f9;
  --max: 920px;
}

* { box-sizing: border-box; }

html { -webkit-text-size-adjust: 100%; }

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Calibri, "Helvetica Neue", Arial, sans-serif;
  font-size: 17px;
  line-height: 1.6;
}

a { color: var(--navy); }
a:hover { color: var(--navy-dark); }

.wrap { max-width: var(--max); margin: 0 auto; padding: 0 20px; }

/* Header */
header.site {
  border-bottom: 1px solid var(--rule);
  background: var(--bg);
}
header.site .wrap {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 8px 24px;
  padding-top: 18px;
  padding-bottom: 18px;
}
.brand {
  font-weight: 700;
  font-size: 18px;
  letter-spacing: 0.02em;
  color: var(--navy);
  text-decoration: none;
}
nav a {
  margin-left: 22px;
  text-decoration: none;
  color: var(--muted);
  font-size: 15px;
}
nav a:first-child { margin-left: 0; }
nav a:hover, nav a[aria-current="page"] { color: var(--navy); }
nav a[aria-current="page"] { font-weight: 600; }

/* Hero */
.hero {
  background: var(--navy);
  color: #fff;
  padding: 64px 0 56px;
}
.hero h1 {
  margin: 0 0 6px;
  font-size: 40px;
  line-height: 1.15;
  letter-spacing: -0.01em;
}
.hero .creds { margin: 0 0 18px; color: #c9d5e6; font-size: 16px; letter-spacing: 0.04em; }
.hero .lede { margin: 0; max-width: 680px; font-size: 20px; line-height: 1.5; color: #eef2f8; }
.hero .actions { margin-top: 28px; display: flex; flex-wrap: wrap; gap: 12px; }

.btn {
  display: inline-block;
  padding: 10px 18px;
  border-radius: 6px;
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  border: 1px solid transparent;
}
.btn-light { background: #fff; color: var(--navy); }
.btn-light:hover { background: #e9eef5; color: var(--navy-dark); }
.btn-ghost { border-color: rgba(255,255,255,0.55); color: #fff; }
.btn-ghost:hover { background: rgba(255,255,255,0.1); color: #fff; }
.btn-navy { background: var(--navy); color: #fff; }
.btn-navy:hover { background: var(--navy-dark); color: #fff; }

/* Sections */
main section { padding: 48px 0; border-bottom: 1px solid var(--rule); }
main section:last-child { border-bottom: 0; }
main section.tint { background: var(--tint); }

h2 {
  margin: 0 0 18px;
  font-size: 14px;
  text-transform: uppercase;
  letter-spacing: 0.12em;
  color: var(--navy);
}
h3 { margin: 0 0 4px; font-size: 18px; }
p { margin: 0 0 14px; }

.page-title { padding: 44px 0 8px; }
.page-title h1 { margin: 0; font-size: 34px; color: var(--navy); line-height: 1.2; }
.page-title p { color: var(--muted); margin-top: 8px; }

/* Lists */
.focus {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 18px;
  margin: 0; padding: 0; list-style: none;
}
.focus li {
  background: var(--bg);
  border: 1px solid var(--rule);
  border-left: 3px solid var(--navy);
  border-radius: 6px;
  padding: 16px 18px;
}
.focus li strong { display: block; margin-bottom: 4px; }
.focus li span { color: var(--muted); font-size: 15px; }

.roles { list-style: none; margin: 0; padding: 0; }
.roles li { padding: 12px 0; border-bottom: 1px solid var(--rule); }
.roles li:last-child { border-bottom: 0; }
.roles .org { color: var(--muted); }

.facts { list-style: none; margin: 0; padding: 0; }
.facts li { padding: 4px 0; }

/* Book */
.book {
  display: grid;
  grid-template-columns: 200px 1fr;
  gap: 32px;
  align-items: start;
}
.book img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 6px 20px rgba(21, 42, 69, 0.18);
  background: var(--tint);
}
.book h3 { font-size: 22px; line-height: 1.3; margin-bottom: 10px; }
.book .sub { color: var(--muted); margin-bottom: 16px; }

/* Downloads */
.dl { list-style: none; margin: 0; padding: 0; }
.dl li {
  display: flex;
  justify-content: space-between;
  align-items: center;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--rule);
}
.dl .meta { color: var(--muted); font-size: 14px; }
.dl a.get { white-space: nowrap; font-weight: 600; font-size: 15px; }
.notice { font-size: 14px; color: var(--muted); }

/* Footer */
footer.site { background: var(--tint); border-top: 1px solid var(--rule); padding: 28px 0; font-size: 14px; color: var(--muted); }
footer.site .wrap { display: flex; flex-wrap: wrap; justify-content: space-between; gap: 10px; }
footer.site a { color: var(--muted); }

@media (max-width: 640px) {
  body { font-size: 16px; }
  .hero { padding: 44px 0 40px; }
  .hero h1 { font-size: 31px; }
  .hero .lede { font-size: 18px; }
  nav a { margin-left: 16px; }
  .book { grid-template-columns: 1fr; }
  .book img { max-width: 180px; }
  .dl li { flex-direction: column; align-items: flex-start; gap: 4px; }
}