:root {
  --paper: #f8f2e8;
  --white: #fffcf6;
  --ink: #302b23;
  --muted: #746957;
  --rust: #994b35;
  --dark: #392d27;
  --line: #dfd2be;
  --serif: "Fraunces", Georgia, serif;
  --body: "Newsreader", Georgia, serif;
}

* {
  box-sizing: border-box;
}
html {
  scroll-behavior: smooth;
  scroll-padding-top: 28px;
}
body {
  margin: 0;
  background: var(--paper);
  color: var(--ink);
  font: 21px/1.55 var(--body);
  -webkit-font-smoothing: antialiased;
}
img {
  display: block;
  max-width: 100%;
}
a {
  color: inherit;
}
button,
a {
  -webkit-tap-highlight-color: transparent;
}
a:focus-visible,
button:focus-visible,
summary:focus-visible {
  outline: 3px solid #b76b36;
  outline-offset: 5px;
}
h1,
h2,
h3,
p {
  margin: 0;
}
h1,
h2,
h3 {
  font-family: var(--serif);
  font-weight: 500;
  line-height: 1.13;
  letter-spacing: -0.04em;
}
h1 {
  font-size: clamp(42px, 6vw, 78px);
}
h2 {
  font-size: clamp(34px, 4vw, 50px);
}
h3 {
  font-size: 28px;
}
p + p {
  margin-top: 16px;
}
.shell {
  width: min(100% - 48px, 1060px);
  margin: auto;
}
.narrow {
  max-width: 780px;
}
.eyebrow {
  font:
    12px/1.5 Arial,
    sans-serif;
  letter-spacing: 0.19em;
  text-transform: uppercase;
}
.draft-ribbon {
  padding: 10px 20px;
  text-align: center;
  background: #e8d8bf;
  font:
    12px/1.5 Arial,
    sans-serif;
}
.masthead {
  padding: 23px 0;
  border-bottom: 1px solid var(--line);
}
.masthead .shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 15px;
}
.brand {
  font: 24px var(--serif);
  text-decoration: none;
}
.masthead nav {
  display: flex;
  gap: 25px;
  font:
    13px Arial,
    sans-serif;
}
.masthead nav a {
  text-decoration: none;
}
.hero {
  background: var(--dark);
  color: var(--white);
  padding: 68px 0 48px;
  text-align: center;
  background-image: radial-gradient(ellipse at 80% 15%, #70442c55, transparent 65%);
}
.hero .eyebrow {
  color: #e2b686;
  margin-bottom: 24px;
}
.hero h1 em {
  color: #e5ad82;
  font-style: normal;
}
.hero .lede {
  color: #e6d8c7;
  font-size: 24px;
  max-width: 680px;
  margin: 23px auto 31px;
}
.intro-frame {
  margin: 0 auto 26px;
  max-width: 720px;
  position: relative;
  overflow: hidden;
  border-radius: 6px;
  border: 1px solid #ffffff30;
}
.intro-frame img {
  aspect-ratio: 16/9;
  width: 100%;
  object-fit: cover;
}
.intro-label {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  padding: 16px;
  background: linear-gradient(transparent, #1c1814e8);
  font:
    13px Arial,
    sans-serif;
  color: white;
}
.btn {
  display: inline-flex;
  justify-content: center;
  align-items: center;
  min-height: 56px;
  padding: 16px 30px;
  background: var(--rust);
  color: white;
  border: 1px solid var(--rust);
  border-radius: 3px;
  text-decoration: none;
  font: 18px var(--serif);
  line-height: 1.3;
}
.btn:hover {
  background: #7b3826;
}
.btn.secondary {
  background: transparent;
  border-color: var(--line);
  color: var(--ink);
}
.hero .sub-link {
  display: block;
  margin-top: 18px;
  font-size: 17px;
  color: #e1c8ad;
}
.hero .small {
  font-size: 15px;
  color: #d8c7b3;
  margin-top: 12px;
}
.section {
  padding: 70px 0;
  border-bottom: 1px solid var(--line);
}
.section-head {
  display: flex;
  gap: 20px;
  align-items: baseline;
  margin-bottom: 24px;
}
.section-no {
  font:
    12px Arial,
    sans-serif;
  color: var(--rust);
}
.section-lede {
  color: var(--muted);
  max-width: 690px;
  margin-bottom: 30px;
}
.steps {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 35px;
  margin-top: 35px;
}
.step-number {
  display: block;
  font: 38px var(--serif);
  color: var(--rust);
  margin-bottom: 12px;
}
.steps h3 {
  font-size: 23px;
  margin-bottom: 10px;
}
.steps p {
  font-size: 19px;
  color: var(--muted);
}
.gallery {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 24px;
}
.sample {
  margin: 0;
}
.sample a {
  display: block;
  border: 1px solid var(--line);
  box-shadow: 0 12px 26px #40352212;
  transition: transform 0.2s;
  background: var(--white);
}
.sample a:hover {
  transform: translateY(-4px);
}
.sample img {
  width: 100%;
  height: auto;
}
.sample figcaption {
  font-size: 17px;
  margin-top: 15px;
}
.sample .eyebrow {
  display: block;
  margin-top: 7px;
  font-size: 10px;
  color: var(--muted);
}
.inside {
  display: grid;
  grid-template-columns: 1.1fr 1fr;
  gap: 60px;
  align-items: start;
}
.inside ul {
  padding-left: 20px;
  margin: 23px 0 0;
}
.inside li {
  margin-bottom: 12px;
}
.note {
  font-size: 17px;
  color: var(--muted);
}
.index {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 15px;
  margin-top: 30px;
}
.index a {
  padding: 25px;
  border-top: 1px solid var(--rust);
  background: #efe5d4;
  text-decoration: none;
}
.index span {
  display: block;
  font-size: 17px;
  color: var(--muted);
  margin-top: 10px;
}
.index strong {
  font: 23px var(--serif);
}
.offer {
  background: #eee1cd;
}
.offer-grid {
  display: grid;
  grid-template-columns: 310px 1fr;
  gap: 65px;
  align-items: center;
}
.book-cover {
  width: 100%;
  box-shadow: 10px 18px 35px #30251b30;
  transform: rotate(-3deg);
}
.offer h2 {
  margin: 15px 0 20px;
}
.offer ul {
  padding-left: 20px;
  font-size: 20px;
}
.offer li {
  margin: 8px 0;
}
.price {
  font: 35px var(--serif);
  margin: 24px 0 16px;
}
.offer .note {
  margin-top: 17px;
}
.author-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 55px;
  align-items: center;
}
.author-photo {
  width: 100%;
  aspect-ratio: 1.1;
  object-fit: cover;
  object-position: center;
}
.author-grid h2 {
  margin: 14px 0 22px;
}
.signature {
  font: italic 30px var(--serif);
  color: var(--rust);
  margin-top: 24px;
}
details {
  border-top: 1px solid var(--line);
  padding: 21px 0;
}
details:last-child {
  border-bottom: 1px solid var(--line);
}
summary {
  font: 22px var(--serif);
  cursor: pointer;
  list-style: none;
  display: flex;
  gap: 20px;
  justify-content: space-between;
}
summary:after {
  content: "+";
  color: var(--rust);
}
details[open] summary:after {
  content: "−";
}
details p {
  margin-top: 15px;
  color: var(--muted);
  font-size: 20px;
}
.closing {
  text-align: center;
  background: var(--dark);
  color: var(--white);
  padding: 65px 0;
}
.closing p {
  color: #ddcdb9;
  margin: 20px auto 28px;
  max-width: 600px;
}
footer {
  text-align: center;
  padding: 27px;
  font-size: 15px;
  color: var(--muted);
}
dialog {
  border: 0;
  padding: 0;
  background: transparent;
  width: min(92vw, 850px);
  max-height: 94vh;
  overflow: visible;
}
dialog::backdrop {
  background: #211c18dc;
}
dialog .viewer {
  background: var(--white);
  max-height: 90vh;
  overflow: auto;
  padding: 18px;
  border-radius: 4px;
}
dialog img {
  width: 100%;
  height: auto;
}
.close-viewer {
  position: sticky;
  top: 0;
  float: right;
  z-index: 1;
  min-width: 44px;
  min-height: 44px;
  background: var(--dark);
  color: white;
  border: 0;
  border-radius: 50%;
  font-size: 25px;
  cursor: pointer;
}
.page-caption {
  padding: 10px 0;
  font-size: 17px;
}
.pdf-link {
  display: inline-block;
  margin-top: 24px;
}
.section.no-border {
  border: 0;
}
.math table {
  width: 100%;
  border-collapse: collapse;
  margin: 10px 0 20px;
  font-size: 19px;
}
.math th,
.math td {
  text-align: left;
  padding: 12px 10px;
  border-bottom: 1px solid var(--line);
}
.math th {
  font:
    12px Arial,
    sans-serif;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--muted);
}
.contents {
  list-style: none;
  padding: 0;
  margin: 10px 0 0;
  columns: 2;
  column-gap: 50px;
}
.contents li {
  display: flex;
  gap: 14px;
  align-items: baseline;
  padding: 10px 0;
  border-bottom: 1px solid var(--line);
  break-inside: avoid;
}
.c-nr {
  font: 20px var(--serif);
  color: var(--rust);
  min-width: 28px;
}
.c-title {
  flex: 1;
}
.c-page {
  font:
    14px Arial,
    sans-serif;
  color: var(--muted);
}
.guarantee {
  margin-top: 26px;
  padding: 20px 22px;
  border: 1px solid var(--line);
  background: var(--white);
}
.guarantee h3 {
  font-size: 22px;
  margin-bottom: 8px;
}
.guarantee p {
  font-size: 18px;
  color: var(--muted);
}

@media (max-width: 720px) {
  body {
    font-size: 19px;
  }
  .shell {
    width: min(100% - 36px, 1060px);
  }
  .masthead {
    padding: 18px 0;
  }
  .masthead nav {
    gap: 15px;
  }
  .masthead nav a:last-child {
    display: none;
  }
  .brand {
    font-size: 21px;
  }
  .hero {
    padding: 43px 0 35px;
  }
  .hero .lede {
    font-size: 21px;
  }
  .hero h1 {
    font-size: 43px;
  }
  .section {
    padding: 47px 0;
  }
  .steps {
    grid-template-columns: 1fr;
    gap: 25px;
  }
  .steps article {
    display: grid;
    grid-template-columns: 40px 1fr;
    gap: 14px;
  }
  .step-number {
    grid-row: span 2;
    margin: 0;
  }
  .steps h3 {
    margin-bottom: 0;
  }
  .steps p {
    grid-column: 2;
  }
  .gallery {
    display: flex;
    overflow-x: auto;
    gap: 18px;
    scroll-snap-type: x mandatory;
    padding: 0 3px 20px;
  }
  .sample {
    flex: 0 0 80%;
    flex-basis: 80%;
    scroll-snap-align: start;
  }
  .sample a {
    box-shadow: 0 8px 16px #40352210;
  }
  .inside,
  .offer-grid,
  .author-grid {
    grid-template-columns: 1fr;
    gap: 30px;
  }
  .index {
    grid-template-columns: 1fr;
  }
  .contents {
    columns: 1;
  }
  .math table {
    font-size: 16px;
  }
  .math th,
  .math td {
    padding: 10px 6px;
  }
  .offer-grid .book-cover {
    max-width: 240px;
    margin: 0 auto;
  }
  .author-photo {
    aspect-ratio: 4/3;
  }
  .btn {
    width: 100%;
  }
  .section-head {
    gap: 14px;
  }
  dialog .viewer {
    padding: 10px;
  }
  .price {
    font-size: 30px;
  }
}

@media (prefers-reduced-motion: reduce) {
  html {
    scroll-behavior: auto;
  }
  .sample a {
    transition: none;
  }
}