:root {
  --color-bg: #fbf7f1;
  --color-surface: #fffdf9;
  --color-surface-muted: #f3eadf;
  --color-text: #251f1b;
  --color-text-muted: #6f6258;
  --color-primary: #8f4f35;
  --color-primary-dark: #63331f;
  --color-border: #dfd1c3;
  --color-shadow: rgba(65, 42, 27, 0.14);

  --font-body: Georgia, 'Times New Roman', serif;
  --font-ui: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;

  --space-xs: 0.5rem;
  --space-sm: 0.75rem;
  --space-md: 1rem;
  --space-lg: 1.5rem;
  --space-xl: 2.5rem;
  --space-2xl: 4rem;

  --radius-sm: 0.75rem;
  --radius-md: 1.25rem;
  --radius-lg: 2rem;
  --max-width: 1120px;
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  background:
    radial-gradient(circle at top left, rgba(143, 79, 53, 0.18), transparent 34rem),
    var(--color-bg);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.65;
}

a {
  color: inherit;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 10;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-lg);
  padding: var(--space-md) max(var(--space-lg), calc((100vw - var(--max-width)) / 2));
  background: rgba(251, 247, 241, 0.86);
  border-bottom: 1px solid var(--color-border);
  backdrop-filter: blur(16px);
}

.brand {
  font-family: var(--font-ui);
  font-weight: 800;
  text-decoration: none;
  letter-spacing: 0.04em;
}

.site-nav {
  display: flex;
  flex-wrap: wrap;
  justify-content: flex-end;
  gap: var(--space-sm) var(--space-lg);
  font-family: var(--font-ui);
  font-size: 0.95rem;
}

.site-nav a {
  text-decoration: none;
  color: var(--color-text-muted);
}

.site-nav a:hover,
.site-nav a:focus-visible {
  color: var(--color-primary-dark);
}

main {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
}

.hero {
  min-height: 72vh;
  align-items: center;
  padding: var(--space-2xl) 0;
}

.section-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.25fr) minmax(280px, 0.75fr);
  gap: var(--space-2xl);
}

.eyebrow {
  margin: 0 0 var(--space-sm);
  color: var(--color-primary);
  font-family: var(--font-ui);
  font-size: 0.78rem;
  font-weight: 800;
  letter-spacing: 0.16em;
  text-transform: uppercase;
}

h1,
h2 {
  margin: 0;
  line-height: 1.08;
}

h1 {
  max-width: 12ch;
  font-size: clamp(3rem, 8vw, 6.8rem);
  letter-spacing: -0.07em;
}

h2 {
  font-size: clamp(2rem, 4vw, 3.4rem);
  letter-spacing: -0.045em;
}

.lead {
  max-width: 42rem;
  margin: var(--space-lg) 0 0;
  color: var(--color-text-muted);
  font-size: clamp(1.15rem, 2vw, 1.45rem);
}

.actions {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-md);
  margin-top: var(--space-xl);
}

.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 3rem;
  padding: 0.75rem 1.25rem;
  border: 1px solid var(--color-primary);
  border-radius: 999px;
  font-family: var(--font-ui);
  font-weight: 700;
  text-decoration: none;
}

.button.primary {
  background: var(--color-primary);
  color: var(--color-surface);
}

.button.secondary {
  color: var(--color-primary-dark);
}

.book-card,
.content-section {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: rgba(255, 253, 249, 0.82);
  box-shadow: 0 24px 70px var(--color-shadow);
}

.book-card {
  align-self: center;
  padding: var(--space-lg);
}

.book-cover-placeholder {
  display: grid;
  min-height: 430px;
  place-items: center;
  border-radius: var(--radius-md);
  background:
    linear-gradient(135deg, rgba(143, 79, 53, 0.12), rgba(143, 79, 53, 0.42)),
    var(--color-surface-muted);
  color: var(--color-primary-dark);
  font-size: clamp(2rem, 6vw, 4rem);
  font-weight: 800;
  letter-spacing: -0.05em;
  text-align: center;
}

.small-note {
  margin: var(--space-md) 0 0;
  color: var(--color-text-muted);
  font-family: var(--font-ui);
  font-size: 0.9rem;
}

.content-section {
  margin: var(--space-xl) 0;
  padding: clamp(1.25rem, 4vw, 3rem);
}

.content-section.muted {
  background: var(--color-surface-muted);
}

.content-section p:last-child {
  margin-bottom: 0;
}

.link-cards {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-md);
  margin-top: var(--space-lg);
}

.link-cards a {
  min-height: 7rem;
  display: grid;
  place-items: center;
  padding: var(--space-lg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  font-family: var(--font-ui);
  font-weight: 800;
  text-decoration: none;
}

.link-cards a:hover,
.link-cards a:focus-visible {
  border-color: var(--color-primary);
  transform: translateY(-2px);
}

.site-footer {
  width: min(100% - 2rem, var(--max-width));
  margin: 0 auto;
  padding: var(--space-xl) 0;
  color: var(--color-text-muted);
  font-family: var(--font-ui);
}

@media (max-width: 760px) {
  .site-header {
    position: static;
    align-items: flex-start;
    flex-direction: column;
  }

  .site-nav {
    justify-content: flex-start;
  }

  .section-grid,
  .link-cards {
    grid-template-columns: 1fr;
  }

  .hero {
    min-height: auto;
  }

  h1 {
    max-width: 100%;
  }
}