@font-face {
  font-family: "Source Serif 4";
  src: url("/assets/fonts/SourceSerif4-Semibold.woff") format("woff");
  font-weight: 600;
  font-display: swap;
}
@font-face {
  font-family: "Source Sans 3";
  src: url("/assets/fonts/SourceSans3-Regular.woff") format("woff");
  font-weight: 400;
  font-display: swap;
}
@font-face {
  font-family: "Source Sans 3";
  src: url("/assets/fonts/SourceSans3-Semibold.woff") format("woff");
  font-weight: 600;
  font-display: swap;
}

:root {
  --bg: #fbf8f3;
  --surface: #ffffff;
  --ink: #23263a;
  --muted: #5e6275;
  --navy: #1e2340;
  --accent: #c8591a;
  --link: #24539e;
  --rule: #e4ded2;
  --max: 1080px;
  --serif: "Source Serif 4", Georgia, "Times New Roman", serif;
  --sans: "Source Sans 3", -apple-system, BlinkMacSystemFont, "Segoe UI", Helvetica, Arial, sans-serif;
}

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

body {
  margin: 0;
  background: var(--bg);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 1.125rem;
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

img {
  max-width: 100%;
  height: auto;
  display: block;
}

a {
  color: var(--link);
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

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

h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 600;
  color: var(--navy);
  line-height: 1.15;
  letter-spacing: -0.01em;
  margin: 0 0 0.5em;
}

h1 {
  font-size: clamp(2.2rem, 4.8vw, 3.4rem);
}

h2 {
  font-size: clamp(1.6rem, 3vw, 2.1rem);
}

h3 {
  font-size: 1.3rem;
}

p {
  margin: 0 0 1em;
}

strong {
  font-weight: 600;
  color: var(--navy);
}

.wrap {
  width: min(var(--max), 100% - 3rem);
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: -999px;
  top: 0.5rem;
  background: var(--navy);
  color: #fff;
  padding: 0.5rem 1rem;
  z-index: 10;
}

.skip-link:focus {
  left: 0.5rem;
}

:focus-visible {
  outline: 2px solid var(--link);
  outline-offset: 3px;
}

/* Header and footer */
.site-header {
  border-bottom: 1px solid var(--rule);
}

.site-header .wrap {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  flex-wrap: wrap;
  padding: 1.1rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.65rem;
  text-decoration: none;
  color: var(--navy);
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.25rem;
}

.brand img {
  width: 40px;
  height: 40px;
}

.brand:hover {
  color: var(--navy);
}

.site-nav ul {
  display: flex;
  gap: 1.75rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.site-nav a {
  color: var(--ink);
  text-decoration: none;
  font-size: 1rem;
}

.site-nav a:hover,
.site-nav a[aria-current="page"] {
  color: var(--navy);
  text-decoration: underline;
  text-decoration-color: var(--accent);
  text-decoration-thickness: 2px;
}

.site-footer {
  border-top: 1px solid var(--rule);
  padding: 2.5rem 0;
  font-size: 0.95rem;
  color: var(--muted);
}

.site-footer .wrap {
  display: flex;
  justify-content: space-between;
  gap: 1rem 2rem;
  flex-wrap: wrap;
}

.site-footer p {
  margin: 0;
}

/* Shared bits */
.eyebrow {
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.75rem;
}

.lede {
  font-size: 1.3rem;
  color: var(--muted);
  max-width: 38rem;
}

.btn {
  display: inline-block;
  font-family: var(--sans);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  color: #fff;
  background: var(--navy);
  border: 1px solid var(--navy);
  border-radius: 6px;
  padding: 0.75rem 1.5rem;
}

.btn:hover {
  color: #fff;
  background: #2e355e;
}

.btn[aria-disabled="true"] {
  background: transparent;
  color: var(--muted);
  border-color: var(--rule);
  cursor: default;
}

.cover {
  box-shadow: 0 1px 2px rgba(30, 35, 64, 0.12), 0 12px 32px rgba(30, 35, 64, 0.18);
}

.section {
  padding: 4.5rem 0;
}

.section + .section {
  border-top: 1px solid var(--rule);
}

.section-head {
  max-width: 42rem;
  margin-bottom: 2.25rem;
}

/* Home */
.hero {
  padding: 5rem 0 4.5rem;
  border-bottom: 1px solid var(--rule);
}

.hero .lede {
  margin-bottom: 2rem;
}

.book-list {
  display: grid;
  gap: 3rem;
}

.book-card {
  display: grid;
  grid-template-columns: 220px 1fr;
  gap: 2.5rem;
  align-items: center;
  max-width: 860px;
  color: inherit;
  text-decoration: none;
}

.book-card:hover {
  color: inherit;
}

.book-card:hover h3 {
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 4px;
}

.book-card h3 {
  font-size: clamp(1.5rem, 2.6vw, 1.9rem);
  margin-bottom: 0.25rem;
}

.book-card .subtitle {
  color: var(--muted);
  margin-bottom: 1rem;
}

.book-card .more {
  font-weight: 600;
  color: var(--link);
}

.status {
  display: inline-block;
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--accent);
  margin-bottom: 0.6rem;
}

.meta {
  font-size: 0.95rem;
  color: var(--muted);
}

.mission {
  max-width: 46rem;
  margin-bottom: 3.5rem;
}

.mission > p:not(.eyebrow) {
  font-size: 1.2rem;
}

.founder-note {
  margin: 2rem 0 0;
  padding: 0.25rem 0 0.25rem 1.5rem;
  border-left: 3px solid var(--accent);
}

.founder-note p {
  font-family: var(--serif);
  font-weight: 600;
  font-size: 1.3rem;
  line-height: 1.5;
  color: var(--navy);
  margin-bottom: 0.75rem;
}

.founder-note footer {
  color: var(--muted);
  font-size: 1rem;
}

.founder-note footer::before {
  content: "— ";
}

.principles {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 2.5rem;
}

.principles div {
  border-top: 2px solid var(--navy);
  padding-top: 1.1rem;
}

.principles p {
  color: var(--muted);
  margin: 0;
}

/* Book page */
.book-hero {
  padding: 3rem 0 4.5rem;
  border-bottom: 1px solid var(--rule);
}

.book-hero .wrap {
  display: grid;
  grid-template-columns: minmax(240px, 380px) 1fr;
  gap: 4rem;
  align-items: start;
}

.breadcrumb {
  font-size: 0.95rem;
  color: var(--muted);
  margin-bottom: 1.25rem;
}

.book-hero h1 {
  margin-bottom: 0.3rem;
}

.book-hero .subtitle {
  font-size: 1.2rem;
  color: var(--muted);
  margin-bottom: 0.4rem;
}

.byline {
  font-weight: 600;
  color: var(--navy);
  margin-bottom: 1.75rem;
}

.buy {
  margin: 2rem 0;
}

.facts {
  display: grid;
  grid-template-columns: max-content 1fr;
  margin: 0;
  border-top: 1px solid var(--rule);
}

.facts dt,
.facts dd {
  margin: 0;
  padding: 0.6rem 0;
  border-bottom: 1px solid var(--rule);
}

.facts dt {
  font-weight: 600;
  color: var(--navy);
  padding-right: 2rem;
}

.grownups {
  max-width: 46rem;
}

.grownups ul {
  padding-left: 1.2rem;
  margin: 1.5rem 0 0;
}

.grownups li {
  margin-bottom: 0.75rem;
}

/* 404 */
.not-found {
  padding: 6rem 0 7rem;
}

@media (max-width: 820px) {
  .book-hero .wrap {
    grid-template-columns: 1fr;
    gap: 2.5rem;
  }

  .book-hero .cover-col {
    max-width: 300px;
  }

  .principles {
    grid-template-columns: 1fr;
    gap: 2rem;
  }
}

@media (max-width: 600px) {
  .hero {
    padding: 3rem 0;
  }

  .book-card {
    grid-template-columns: 1fr;
    gap: 1.5rem;
  }

  .book-card .cover {
    max-width: 220px;
  }
}