:root {
  --colour-bg: #050608;
  --colour-bg-alt: #0c0f14;
  --colour-surface: #151922;
  --colour-border-subtle: rgba(255, 255, 255, 0.06);
  --colour-text: #f4f4f5;
  --colour-text-muted: #a1a1aa;
  --colour-accent: #d1a76a;
  --colour-accent-soft: rgba(209, 167, 106, 0.15);
  --colour-nav: rgba(5, 6, 8, 0.88);
  --shadow-soft: 0 18px 45px rgba(0, 0, 0, 0.7);
  --radius-lg: 18px;
  --radius-md: 12px;
  --radius-pill: 999px;
  --max-width: 1120px;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  min-height: 100vh;
  font-family: "Source Sans 3", system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.6;
  color: var(--colour-text);
  background: radial-gradient(circle at top, #202531 0, transparent 40%), var(--colour-bg);
}

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

a {
  color: var(--colour-accent);
  text-decoration: none;
}

a:hover,
a:focus-visible {
  text-decoration: underline;
}

h1,
h2,
h3 {
  font-family: "Playfair Display", "Times New Roman", serif;
  letter-spacing: 0.02em;
}

h1 {
  font-size: clamp(2.4rem, 3.5vw + 1.4rem, 3.4rem);
  line-height: 1.1;
  margin: 0 0 1rem;
}

h2 {
  font-size: 1.9rem;
  margin: 0 0 0.85rem;
}

h3 {
  font-size: 1.1rem;
  margin: 0 0 0.35rem;
}

p {
  margin: 0 0 1rem;
}

.container {
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.5rem;
}

.visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  border: 0;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 40;
  backdrop-filter: blur(18px);
  background: linear-gradient(to bottom, var(--colour-nav), transparent);
  border-bottom: 1px solid var(--colour-border-subtle);
}

.header-inner {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0.6rem 1.5rem;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.8rem;
  color: inherit;
}

.brand:hover,
.brand:focus-visible {
  text-decoration: none;
}

.brand-mark {
  width: 44px;
  height: auto;
  border-radius: 999px;
  box-shadow: 0 0 0 1px rgba(255, 255, 255, 0.1);
}

.brand-text {
  display: flex;
  flex-direction: column;
}

.brand-name {
  font-size: 0.95rem;
  text-transform: uppercase;
  letter-spacing: 0.2em;
}

.brand-tagline {
  font-size: 0.75rem;
  color: var(--colour-text-muted);
}

.primary-nav {
  display: flex;
  align-items: center;
  gap: 1rem;
}

.nav-list {
  list-style: none;
  display: flex;
  gap: 1.25rem;
  margin: 0;
  padding: 0;
}

.nav-list a {
  font-size: 0.9rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--colour-text-muted);
}

.nav-list a:hover,
.nav-list a:focus-visible {
  color: var(--colour-text);
  text-decoration: none;
}

.nav-toggle {
  display: none;
}

.hero {
  position: relative;
  overflow: hidden;
  color: #fff;
}

.hero-media {
  position: absolute;
  inset: 0;
  z-index: -2;
}

.hero-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.45;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(130deg, rgba(5, 6, 8, 0.98), rgba(5, 6, 8, 0.90), rgba(5, 6, 8, 0.85));
  z-index: 1;
}

.hero-content {
  position: relative;
  z-index: 2;
  padding: 5.5rem 1.5rem 4.5rem;
  max-width: var(--max-width);
}

.eyebrow {
  text-transform: uppercase;
  letter-spacing: 0.18em;
  font-size: 0.8rem;
  color: var(--colour-accent);
  margin-bottom: 0.7rem;
}

.hero-lead {
  max-width: 40rem;
  font-size: 1.02rem;
  color: var(--colour-text-muted);
}

.hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.4rem;
  border-radius: var(--radius-pill);
  font-size: 0.9rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 1px solid transparent;
  cursor: pointer;
  transition: background-color 0.18s ease, color 0.18s ease, border-color 0.18s ease, transform 0.12s ease, box-shadow 0.18s ease;
}

.btn-primary {
  background: var(--colour-accent);
  color: #101014;
  box-shadow: var(--shadow-soft);
}

.btn-primary:hover,
.btn-primary:focus-visible {
  background: #e2bb7c;
  text-decoration: none;
  transform: translateY(-1px);
}

.btn-ghost {
  background: rgba(15, 23, 42, 0.75);
  color: var(--colour-text);
  border-color: rgba(148, 163, 184, 0.4);
}

.btn-ghost:hover,
.btn-ghost:focus-visible {
  background: rgba(15, 23, 42, 1);
  border-color: rgba(226, 232, 240, 0.7);
  text-decoration: none;
}

.section {
  padding: 3.75rem 0;
}

.section-alt {
  background: radial-gradient(circle at top left, rgba(148, 163, 184, 0.12), transparent 52%), var(--colour-bg-alt);
  border-top: 1px solid var(--colour-border-subtle);
  border-bottom: 1px solid var(--colour-border-subtle);
}

.section-header {
  max-width: 32rem;
  margin-bottom: 2rem;
}

.section-header p {
  color: var(--colour-text-muted);
}

.grid {
  display: grid;
  gap: 2rem;
}

.two-column {
  grid-template-columns: minmax(0, 1.25fr) minmax(0, 1.4fr);
  align-items: flex-start;
}

.key-points {
  display: grid;
  gap: 1rem;
}

.key-point {
  background: radial-gradient(circle at top left, rgba(148, 163, 184, 0.08), transparent 65%), rgba(12, 16, 24, 0.85);
  border-radius: var(--radius-md);
  padding: 1rem 1.1rem;
  border: 1px solid var(--colour-border-subtle);
}

.key-point p {
  color: var(--colour-text-muted);
  font-size: 0.95rem;
}

.book-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1.4rem;
}

.book-card {
  display: grid;
  grid-template-columns: 10px 1fr;
  background: rgba(13, 16, 24, 0.9);
  border-radius: var(--radius-lg);
  border: 1px solid var(--colour-border-subtle);
  box-shadow: var(--shadow-soft);
  overflow: hidden;
  min-height: 200px;
}

.book-spine {
  background: linear-gradient(to bottom, #111827, #020617);
}

.book-body {
  padding: 1.3rem 1.3rem 1.4rem;
}

.book-series {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.16em;
  color: var(--colour-text-muted);
  margin-bottom: 0.35rem;
}

.book-title {
  font-size: 1.25rem;
  margin-bottom: 0.1rem;
}

.book-subtitle {
  font-size: 0.9rem;
  font-weight: 600;
  color: var(--colour-accent);
}

.book-copy {
  margin-top: 0.65rem;
  color: var(--colour-text-muted);
  font-size: 0.95rem;
}

.list-note {
  margin-top: 1.7rem;
  font-size: 0.9rem;
  color: var(--colour-text-muted);
}

.pillars {
  display: grid;
  gap: 1.1rem;
}

.pillar {
  background: rgba(12, 16, 24, 0.95);
  border-radius: var(--radius-md);
  padding: 1.1rem 1.2rem;
  border: 1px solid var(--colour-border-subtle);
}

.pillar p {
  color: var(--colour-text-muted);
  font-size: 0.95rem;
}

.styled-list {
  padding-left: 1.2rem;
  margin: 0 0 1rem;
  color: var(--colour-text-muted);
  font-size: 0.95rem;
}

.styled-list li + li {
  margin-top: 0.4rem;
}

.submission-cta {
  background: radial-gradient(circle at top left, var(--colour-accent-soft), transparent 70%), rgba(10, 12, 18, 0.98);
  border-radius: var(--radius-lg);
  padding: 1.4rem 1.5rem;
  border: 1px solid rgba(209, 213, 219, 0.24);
  box-shadow: var(--shadow-soft);
}

.submission-cta h3 {
  margin-bottom: 0.6rem;
}

.section-contact {
  background: radial-gradient(circle at top right, rgba(30, 64, 175, 0.22), transparent 60%), var(--colour-bg);
  border-top: 1px solid var(--colour-border-subtle);
}

.contact-details p {
  color: var(--colour-text-muted);
  font-size: 0.95rem;
}

.contact-footnote {
  margin-top: 0.8rem;
  font-size: 0.85rem;
}

.contact-card {
  background: rgba(15, 23, 42, 0.96);
  border-radius: var(--radius-lg);
  padding: 1.5rem 1.5rem 1.6rem;
  border: 1px solid var(--colour-border-subtle);
  box-shadow: var(--shadow-soft);
  font-size: 0.95rem;
}

.site-footer {
  border-top: 1px solid var(--colour-border-subtle);
  padding: 1.2rem 0 1.8rem;
  background: #020308;
}

.footer-inner {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 0.8rem;
  padding: 0 1.5rem;
  font-size: 0.85rem;
  color: var(--colour-text-muted);
}

.footer-brand {
  text-transform: uppercase;
  letter-spacing: 0.16em;
}

@media (max-width: 800px) {
  .header-inner {
    padding-inline: 1.1rem;
  }

  .two-column {
    grid-template-columns: minmax(0, 1fr);
  }

  .book-grid {
    grid-template-columns: minmax(0, 1fr);
  }

  .hero-content {
    padding-top: 4.4rem;
    padding-bottom: 3.5rem;
  }

  .brand-tagline {
    display: none;
  }

  .nav-toggle {
    display: inline-flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    gap: 4px;
    width: 36px;
    height: 32px;
    padding: 0;
    border-radius: 999px;
    background: rgba(15, 23, 42, 0.96);
    border: 1px solid rgba(148, 163, 184, 0.6);
    cursor: pointer;
  }

  .nav-toggle span {
    display: block;
    width: 16px;
    height: 2px;
    background: #e5e7eb;
    border-radius: 999px;
    margin-inline: auto;
  }

  .nav-list {
    position: absolute;
    right: 1.1rem;
    top: 3.6rem;
    flex-direction: column;
    align-items: flex-start;
    gap: 0;
    background: #020617;
    border-radius: var(--radius-md);
    border: 1px solid var(--colour-border-subtle);
    padding: 0.45rem 0.75rem;
    box-shadow: var(--shadow-soft);
    transform-origin: top right;
    transform: scale(0.98);
    opacity: 0;
    pointer-events: none;
  }

  .nav-list.nav-open {
    opacity: 1;
    transform: scale(1);
    pointer-events: auto;
  }

  .nav-list li {
    padding: 0.3rem 0.1rem;
  }

  .nav-list a {
    font-size: 0.78rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }

  *,
  *::before,
  *::after {
    scroll-behavior: auto !important;
    animation: none !important;
    transition: none !important;
  }
}