:root {
  --bg: #090d14;
  --bg-soft: #101723;
  --ink: #10151d;
  --muted: #657083;
  --white: #ffffff;
  --offwhite: #f5f3ee;
  --line: rgba(255, 255, 255, 0.12);
  --blue: #27a8e8;
  --orange: #ff7a2f;
  --gold: #d8bd63;
  --gold-deep: #b49a42;
  --max: 1180px;
  --radius: 28px;
  --shadow: 0 28px 80px rgba(0, 0, 0, 0.22);
}

* {
  box-sizing: border-box;
}

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  font-family: "Inter", Arial, sans-serif;
  color: var(--ink);
  background: var(--offwhite);
  line-height: 1.65;
  -webkit-font-smoothing: antialiased;
}

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

a {
  color: inherit;
}

.container {
  width: min(var(--max), calc(100% - 48px));
  margin-inline: auto;
}

.skip-link {
  position: absolute;
  left: 12px;
  top: -60px;
  z-index: 100;
  background: #fff;
  color: #000;
  padding: 10px 14px;
  border-radius: 8px;
}

.skip-link:focus {
  top: 12px;
}

.site-header {
  position: sticky;
  top: 0;
  z-index: 50;
  background: rgba(9, 13, 20, 0.88);
  border-bottom: 1px solid rgba(255,255,255,.08);
  backdrop-filter: blur(16px);
}

.nav-wrap {
  min-height: 76px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 28px;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 12px;
  color: #fff;
  text-decoration: none;
  font-weight: 700;
  letter-spacing: -0.02em;
}

.brand-mark {
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 11px;
  background: linear-gradient(135deg, var(--gold), var(--orange));
  color: #111;
  font-weight: 800;
  font-size: .86rem;
}

.nav {
  display: flex;
  align-items: center;
  gap: 28px;
  color: #d8dde7;
  font-size: .93rem;
}

.nav a {
  text-decoration: none;
  transition: color .2s ease, transform .2s ease;
}

.nav a:hover {
  color: #fff;
}

.nav-cta {
  border: 1px solid rgba(255,255,255,.28);
  padding: 10px 15px;
  border-radius: 999px;
}

.hero {
  position: relative;
  overflow: hidden;
  background:
    radial-gradient(circle at 75% 25%, rgba(21, 122, 202, .18), transparent 34%),
    linear-gradient(145deg, #070a10 0%, #0b1019 60%, #111827 100%);
  color: #fff;
  padding: 86px 0 104px;
}

.hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, rgba(255,255,255,.18), transparent);
}

.hero-glow {
  position: absolute;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  filter: blur(85px);
  opacity: .16;
  pointer-events: none;
}

.hero-glow-one {
  background: var(--blue);
  top: 4%;
  right: 7%;
}

.hero-glow-two {
  background: var(--orange);
  bottom: -14%;
  right: 35%;
}

.hero-grid {
  position: relative;
  z-index: 2;
  display: grid;
  grid-template-columns: 1.02fr .98fr;
  gap: 52px;
  align-items: center;
}

.eyebrow {
  margin: 0 0 14px;
  font-size: .78rem;
  font-weight: 800;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--orange);
}

.hero h1,
.section-heading h2,
.series-copy h2,
.author-copy h2,
.closing-card h2 {
  font-family: "Playfair Display", Georgia, serif;
  letter-spacing: -0.035em;
  line-height: 1.03;
}

.hero h1 {
  margin: 0;
  font-size: clamp(3.2rem, 6.2vw, 6.1rem);
  max-width: 820px;
}

.hero-lede {
  max-width: 690px;
  margin: 28px 0 0;
  color: #c6cfdd;
  font-size: clamp(1.06rem, 1.4vw, 1.22rem);
}

.hero-actions,
.book-actions,
.author-actions,
.closing-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  align-items: center;
}

.hero-actions {
  margin-top: 34px;
}

.button {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 48px;
  padding: 0 20px;
  border-radius: 999px;
  text-decoration: none;
  font-weight: 700;
  font-size: .95rem;
  transition: transform .18s ease, box-shadow .18s ease, background .18s ease;
}

.button:hover {
  transform: translateY(-2px);
}

.button-primary {
  background: #fff;
  color: #0b1018;
  box-shadow: 0 12px 28px rgba(0,0,0,.2);
}

.button-secondary {
  border: 1px solid rgba(255,255,255,.25);
  color: #fff;
}

.button-orange {
  background: var(--orange);
  color: #17100d;
  box-shadow: 0 12px 26px rgba(255,122,47,.18);
}

.button-gold {
  background: linear-gradient(135deg, #e2cc78, #c3a54b);
  color: #14110a;
  box-shadow: 0 12px 26px rgba(196,165,75,.18);
}

.hero-note {
  margin-top: 24px;
  display: flex;
  align-items: center;
  gap: 10px;
  color: #9ca8b8;
  font-size: .88rem;
}

.dot {
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: #62d6a8;
  box-shadow: 0 0 0 5px rgba(98,214,168,.1);
}

.hero-books {
  position: relative;
  min-height: 570px;
}

.hero-book {
  position: absolute;
  margin: 0;
  width: 68%;
  filter: drop-shadow(0 30px 34px rgba(0,0,0,.36));
}

.hero-book img {
  width: 100%;
  border-radius: 4px;
}

.hero-book-back {
  left: 0;
  top: 48px;
  opacity: .9;
  transform: rotate(-5deg);
}

.hero-book-front {
  right: -1%;
  top: 0;
  transform: rotate(4deg);
}

.books-section {
  padding: 112px 0;
  background: #f6f4ef;
}

.section-heading {
  max-width: 820px;
  margin-bottom: 54px;
}

.section-heading h2,
.series-copy h2,
.author-copy h2,
.closing-card h2 {
  font-size: clamp(2.45rem, 4.8vw, 4.4rem);
  margin: 0;
}

.section-heading > p:last-child {
  max-width: 720px;
  color: var(--muted);
  font-size: 1.07rem;
}

.book-feature {
  display: grid;
  grid-template-columns: .8fr 1.2fr;
  gap: 54px;
  align-items: center;
  border-radius: var(--radius);
  padding: clamp(30px, 5vw, 58px);
  box-shadow: var(--shadow);
}

.book-feature + .book-feature {
  margin-top: 44px;
}

.book-feature-dark {
  background:
    radial-gradient(circle at 20% 80%, rgba(39,168,232,.16), transparent 34%),
    linear-gradient(145deg, #0a101a, #121927);
  color: #fff;
}

.book-feature-light {
  background:
    radial-gradient(circle at 15% 20%, rgba(55,111,183,.12), transparent 30%),
    #fff;
  color: var(--ink);
}

.book-image-wrap img {
  width: 100%;
  filter: drop-shadow(0 24px 34px rgba(0,0,0,.25));
}

.book-content h3 {
  margin: 4px 0 16px;
  font-family: "Playfair Display", Georgia, serif;
  font-size: clamp(2.2rem, 4vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.03em;
}

.book-kicker {
  display: inline-block;
  margin-bottom: 8px;
  font-size: .75rem;
  letter-spacing: .14em;
  font-weight: 800;
  color: var(--orange);
}

.book-feature-light .book-kicker {
  color: #80680e;
}

.book-intro {
  font-size: 1.15rem;
  font-weight: 600;
}

.book-feature-dark p,
.book-feature-dark li {
  color: #c7d0df;
}

.book-feature-light p,
.book-feature-light li {
  color: #596477;
}

.takeaways {
  padding: 0;
  margin: 24px 0 30px;
  list-style: none;
}

.takeaways li {
  position: relative;
  padding-left: 28px;
  margin: 10px 0;
}

.takeaways li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .65em;
  width: 12px;
  height: 2px;
  background: var(--orange);
}

.book-feature-light .takeaways li::before {
  background: var(--gold-deep);
}

.text-link {
  color: #fff;
  text-decoration: none;
  font-weight: 700;
}

.dark-link {
  color: #253143;
}

.text-link span {
  display: inline-block;
  transition: transform .18s ease;
}

.text-link:hover span {
  transform: translateX(4px);
}

.series-section {
  padding: 108px 0;
  background: #fff;
}

.series-grid {
  display: grid;
  grid-template-columns: 1fr .85fr;
  gap: 90px;
  align-items: center;
}

.series-copy p:not(.eyebrow) {
  color: var(--muted);
  font-size: 1.06rem;
}

.series-path {
  background: #0c121c;
  color: #fff;
  border-radius: var(--radius);
  padding: 26px;
  box-shadow: var(--shadow);
}

.path-card {
  padding: 28px;
  border: 1px solid rgba(255,255,255,.1);
  border-radius: 20px;
  background: rgba(255,255,255,.025);
}

.path-card-accent {
  background: linear-gradient(145deg, rgba(255,122,47,.14), rgba(39,168,232,.10));
}

.path-number {
  display: inline-block;
  margin-bottom: 12px;
  color: var(--gold);
  font-weight: 800;
  font-size: .86rem;
  letter-spacing: .12em;
}

.path-card h3 {
  font-size: 1.6rem;
  margin: 0 0 8px;
}

.path-card p {
  margin: 0;
  color: #aeb8c7;
}

.path-line {
  width: 2px;
  height: 32px;
  margin-left: 54px;
  background: linear-gradient(var(--gold), var(--orange));
}

.author-section {
  padding: 110px 0;
  background:
    linear-gradient(rgba(8,12,19,.92), rgba(8,12,19,.96)),
    radial-gradient(circle at 20% 20%, #1c3a55, transparent 45%);
  color: #fff;
}

.author-grid {
  display: grid;
  grid-template-columns: .45fr 1.2fr;
  gap: 72px;
  align-items: start;
}

.author-tag {
  display: inline-flex;
  align-items: center;
  min-height: 48px;
  padding: 0 16px;
  border: 1px solid rgba(255,255,255,.16);
  border-radius: 999px;
  color: #aab6c8;
  font-size: .74rem;
  letter-spacing: .12em;
  font-weight: 800;
}

.author-copy p:not(.eyebrow) {
  color: #bac5d4;
  max-width: 790px;
  font-size: 1.06rem;
}

.author-actions {
  margin-top: 30px;
}

.light-border {
  border-color: rgba(255,255,255,.28);
}

.closing-section {
  padding: 88px 0;
  background: #ece9e1;
}

.closing-card {
  text-align: center;
  background: #fff;
  border-radius: 30px;
  padding: clamp(42px, 7vw, 76px) 24px;
  box-shadow: 0 24px 80px rgba(21,24,31,.08);
}

.closing-card p:not(.eyebrow) {
  max-width: 700px;
  margin: 20px auto 30px;
  color: var(--muted);
}

.closing-actions {
  justify-content: center;
}

.site-footer {
  background: #070a10;
  color: #aab5c6;
  padding: 38px 0;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1fr auto auto;
  gap: 34px;
  align-items: center;
}

.footer-brand {
  color: #fff;
  font-weight: 800;
}

.footer-grid p {
  margin: 2px 0 0;
  font-size: .88rem;
}

.footer-links {
  display: flex;
  gap: 22px;
}

.footer-links a {
  text-decoration: none;
  font-size: .9rem;
}

.copyright {
  text-align: right;
}

@media (max-width: 980px) {
  .nav a:not(.nav-cta) {
    display: none;
  }

  .hero-grid,
  .series-grid,
  .author-grid {
    grid-template-columns: 1fr;
  }

  .hero-books {
    min-height: 500px;
    max-width: 650px;
    width: 100%;
    margin: 16px auto 0;
  }

  .book-feature {
    grid-template-columns: .75fr 1.25fr;
    gap: 34px;
  }

  .author-grid {
    gap: 28px;
  }

  .author-tag {
    width: max-content;
  }

  .footer-grid {
    grid-template-columns: 1fr;
    gap: 18px;
  }

  .copyright {
    text-align: left;
  }
}

@media (max-width: 760px) {
  .container {
    width: min(var(--max), calc(100% - 30px));
  }

  .brand-text {
    font-size: .92rem;
  }

  .nav-cta {
    padding: 9px 12px;
    font-size: .82rem;
  }

  .hero {
    padding: 62px 0 74px;
  }

  .hero h1 {
    font-size: clamp(2.7rem, 14vw, 4.3rem);
  }

  .hero-books {
    min-height: 400px;
  }

  .hero-book {
    width: 75%;
  }

  .books-section,
  .series-section,
  .author-section {
    padding: 76px 0;
  }

  .book-feature {
    grid-template-columns: 1fr;
    padding: 28px 22px 34px;
  }

  .book-image-wrap {
    max-width: 450px;
    margin-inline: auto;
  }

  .book-content h3 {
    font-size: clamp(2.1rem, 10vw, 3.2rem);
  }

  .section-heading h2,
  .series-copy h2,
  .author-copy h2,
  .closing-card h2 {
    font-size: clamp(2.25rem, 11vw, 3.5rem);
  }

  .footer-links {
    flex-wrap: wrap;
  }
}

@media (max-width: 500px) {
  .nav {
    display: none;
  }

  .hero-books {
    min-height: 330px;
  }

  .hero-book {
    width: 80%;
  }

  .hero-book-back {
    left: -3%;
  }

  .hero-book-front {
    right: -4%;
  }

  .button {
    width: 100%;
  }

  .book-actions .text-link {
    width: 100%;
    margin-top: 4px;
  }
}