:root {
  --ink: #23201a;
  --muted: #665f53;
  --paper: #f5efdf;
  --paper-shadow: #e8dfca;
  --line: #a79a7d;
  --card: #f9f4e7;
}

* {
  box-sizing: border-box;
}

body {
  margin: 0;
  color: var(--ink);
  font-family: "Iowan Old Style", "Palatino Linotype", Palatino, Garamond, serif;
  background:
    radial-gradient(circle at 20% 5%, rgba(255, 255, 255, 0.45), transparent 35%),
    radial-gradient(circle at 80% 15%, rgba(255, 255, 255, 0.32), transparent 30%),
    repeating-linear-gradient(
      -11deg,
      rgba(130, 112, 74, 0.03),
      rgba(130, 112, 74, 0.03) 2px,
      rgba(245, 239, 223, 0.93) 2px,
      rgba(245, 239, 223, 0.93) 8px
    ),
    var(--paper);
}

main {
  width: min(1100px, 92vw);
  margin: 0 auto;
  padding: 3rem 0 6rem;
}

.kicker {
  letter-spacing: 0.15em;
  text-transform: uppercase;
  font-size: 0.73rem;
  color: var(--muted);
  margin-bottom: 0.8rem;
}

h1,
h2 {
  margin: 0;
  line-height: 1.08;
  font-weight: 500;
}

h1 {
  font-size: clamp(2.1rem, 5vw, 4rem);
}

h2 {
  font-size: clamp(1.8rem, 4.2vw, 3.2rem);
}

.hero {
  padding: 2rem 0 0.5rem;
}

.engraved-divider {
  height: 26px;
  margin: 1.2rem 0 2rem;
  position: relative;
}

.engraved-divider::before,
.engraved-divider::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  margin: auto;
}

.engraved-divider::before {
  top: 12px;
  width: min(620px, 100%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid rgba(255, 255, 255, 0.45);
}

.engraved-divider::after {
  width: 18px;
  height: 18px;
  top: 3px;
  border: 1px solid var(--line);
  transform: rotate(45deg);
  background: var(--paper);
}

.hero-scroll-stage {
  position: relative;
}

.hero-progress {
  margin: 0 0 0.6rem;
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.hero-copy-window {
  max-height: min(58vh, 520px);
  overflow: auto;
  border: 1px solid rgba(167, 154, 125, 0.45);
  box-shadow: 0 18px 40px rgba(90, 75, 40, 0.12);
  background: rgba(255, 255, 255, 0.38);
  padding: clamp(1rem, 2.6vw, 1.8rem);
  position: relative;
  -webkit-mask-image: linear-gradient(to bottom, transparent 0%, black 10%, black 90%, transparent 100%);
  mask-image: linear-gradient(to bottom, transparent 0%, black 10%, black 90%, transparent 100%);
}

.hero-copy {
  max-width: 74ch;
  margin: 0;
  font-size: clamp(1rem, 1.8vw, 1.18rem);
  line-height: 1.72;
}

.hero-copy p {
  margin: 0 0 1.05rem;
}

.books {
  padding-top: 4rem;
}

.books-header {
  max-width: 62ch;
  margin-bottom: 2.3rem;
}

.books-header p {
  color: var(--muted);
  line-height: 1.65;
}

.book-stage {
  position: relative;
  height: calc(var(--book-count, 7) * 82vh + 95vh);
}

.book-stack {
  position: sticky;
  top: 10vh;
  height: 78vh;
  display: grid;
  place-items: center;
  perspective: 1800px;
}

.book-card {
  position: absolute;
  width: min(78vw, 430px);
  aspect-ratio: 2 / 3;
  border-radius: 5px;
  overflow: hidden;
  background: #f2e7cc;
  box-shadow: 0 12px 32px rgba(43, 33, 20, 0.28);
  transform-origin: left center;
  transform-style: preserve-3d;
  transition: transform 260ms ease-out, opacity 260ms ease-out;
  border: 1px solid rgba(90, 72, 40, 0.4);
}

.book-spine {
  position: absolute;
  inset: 0 auto 0 0;
  width: 10%;
  background: linear-gradient(90deg, #4f3620, #8c6644);
  box-shadow: inset -2px 0 2px rgba(255, 255, 255, 0.22);
  z-index: 2;
}

.book-cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.book-meta {
  position: absolute;
  left: calc(100% + 1.2rem);
  top: 50%;
  width: min(45vw, 390px);
  transform: translateY(-50%);
  opacity: 0;
  transition: opacity 240ms ease;
}

.book-meta h3 {
  margin: 0 0 0.5rem;
  font-size: clamp(1.2rem, 2.3vw, 1.8rem);
  font-weight: 500;
}

.book-meta p {
  margin: 0;
  color: var(--muted);
  line-height: 1.58;
}

.book-card.is-active + .book-meta {
  opacity: 1;
}

@media (max-width: 920px) {
  .book-meta {
    left: 0;
    right: 0;
    top: calc(100% + 1rem);
    transform: none;
    width: min(88vw, 560px);
    margin: auto;
    text-align: center;
  }

  .book-stack {
    top: 4vh;
  }

  .book-stage {
    height: calc(var(--book-count, 7) * 90vh + 125vh);
  }
}