@font-face {
  font-family: "Lato";
  font-style: normal;
  font-weight: 400;
  font-display: swap;
  src: url("fonts/lato-regular.woff2") format("woff2");
}

@font-face {
  font-family: "Lato";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/lato-bold.woff2") format("woff2");
}

@font-face {
  font-family: "Oswald";
  font-style: normal;
  font-weight: 700;
  font-display: swap;
  src: url("fonts/oswald-bold.woff2") format("woff2");
}

:root {
  --ink: #162125;
  --muted: #526267;
  --paper: #fbfaf7;
  --white: #ffffff;
  --teal-deep: #094f65;
  --teal: #156a7d;
  --teal-bright: #50a7bf;
  --orange: #f15a24;
  --line: rgba(9, 79, 101, 0.18);
  --shadow: 0 1.4rem 3.6rem rgba(7, 44, 54, 0.16);
  --content: 74rem;
}

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

html {
  scroll-behavior: smooth;
}

body {
  margin: 0;
  color: var(--ink);
  background: var(--paper);
  font-family: "Lato", Arial, sans-serif;
  font-size: 1rem;
  line-height: 1.7;
  text-rendering: optimizeLegibility;
}

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

a {
  color: inherit;
  text-underline-offset: 0.18em;
}

a:focus-visible,
button:focus-visible,
summary:focus-visible,
input:focus-visible,
textarea:focus-visible {
  outline: 0.2rem solid var(--orange);
  outline-offset: 0.25rem;
}

h1,
h2,
h3,
p,
figure {
  margin-top: 0;
}

h1,
h2 {
  font-family: "Oswald", "Arial Narrow", sans-serif;
  font-weight: 700;
  line-height: 1.12;
}

h2 {
  color: var(--teal-deep);
  font-size: clamp(2rem, 4vw, 3.25rem);
}

.site-header {
  position: relative;
  z-index: 2;
  display: grid;
  min-height: 5.8rem;
  padding: 1.25rem 1.5rem;
  place-items: center;
  background: var(--white);
}

.site-header::after {
  position: absolute;
  bottom: -1.45rem;
  width: 0;
  height: 0;
  border-top: 1.5rem solid var(--white);
  border-right: 1.7rem solid transparent;
  border-left: 1.7rem solid transparent;
  content: "";
}

.site-title {
  display: flex;
  color: var(--orange);
  font-size: clamp(0.8rem, 1.2vw, 1rem);
  font-weight: 700;
  letter-spacing: 0.16em;
  line-height: 1.45;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  flex-direction: column;
}

.hero {
  display: grid;
  min-height: min(51rem, calc(100svh - 5.8rem));
  padding: clamp(3rem, 7vw, 7.5rem) max(5vw, calc((100vw - var(--content)) / 2));
  align-items: center;
  background-color: #eeece8;
  background-image: url("images/iod-cover-hero.jpg");
  background-position: center;
  background-size: cover;
  grid-template-columns: minmax(0, 1fr) minmax(22rem, 0.8fr);
}

.hero-copy {
  max-width: 37rem;
  padding: clamp(1.5rem, 3vw, 2.75rem);
  text-align: center;
  animation: rise-in 700ms ease-out both;
  grid-column: 2;
}

.hero-intro {
  margin-bottom: 1rem;
  font-size: clamp(1.2rem, 2vw, 1.6rem);
  line-height: 1.45;
}

.hero h1 {
  margin-bottom: 1.7rem;
  color: var(--teal-deep);
  font-size: clamp(2.25rem, 4vw, 3.6rem);
}

.button {
  display: inline-flex;
  min-height: 2.8rem;
  padding: 0.72rem 1.55rem;
  align-items: center;
  justify-content: center;
  border: 0.12rem solid currentColor;
  border-radius: 999rem;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  line-height: 1.25;
  text-align: center;
  text-decoration: none;
  text-transform: uppercase;
  transition: background-color 180ms ease, color 180ms ease, transform 180ms ease;
}

.button:hover:not(:disabled) {
  transform: translateY(-0.13rem);
}

.button-primary {
  border-color: var(--teal-deep);
  color: var(--white);
  background: var(--teal-deep);
}

.button-primary:hover:not(:disabled) {
  border-color: var(--orange);
  background: var(--orange);
}

.button-light {
  border-color: var(--white);
  color: var(--teal-deep);
  background: var(--white);
}

.button-light:hover:not(:disabled) {
  border-color: var(--orange);
  color: var(--white);
  background: var(--orange);
}

.section-inner {
  width: min(calc(100% - 2rem), var(--content));
  margin-inline: auto;
}

.section-dark {
  color: var(--white);
  background: var(--teal-deep);
}

.section-dark h2 {
  color: inherit;
}

.intro-section {
  padding-block: clamp(5rem, 10vw, 8.5rem);
}

.intro-layout {
  display: grid;
  align-items: start;
  gap: clamp(2rem, 6vw, 6rem);
  grid-template-columns: minmax(13rem, 0.6fr) minmax(18rem, 1fr);
}

.eyebrow {
  margin-bottom: 0.5rem;
  color: #91d9e8;
  font-size: 0.78rem;
  font-weight: 700;
  letter-spacing: 0.15em;
  text-transform: uppercase;
}

.intro-layout h2 {
  margin-bottom: 0;
}

.intro-body {
  max-width: 42rem;
}

.intro-body p {
  margin-bottom: 2rem;
  font-size: 1.1rem;
}

.book-section {
  padding-block: clamp(5rem, 10vw, 9rem);
  background: var(--white);
}

.book-layout {
  display: grid;
  align-items: center;
  gap: clamp(3rem, 8vw, 8rem);
  grid-template-columns: minmax(16rem, 0.78fr) minmax(19rem, 1fr);
}

.book-figure {
  margin-bottom: 0;
}

.book-figure img {
  width: min(100%, 31rem);
  margin-inline: auto;
  box-shadow: var(--shadow);
}

.book-copy {
  max-width: 39rem;
}

.book-copy p {
  font-size: clamp(1.05rem, 1.6vw, 1.2rem);
}

.downloads-section {
  padding-block: clamp(4.5rem, 8vw, 7rem);
  text-align: center;
}

.downloads-section h2 {
  margin-bottom: 3rem;
}

.downloads-list {
  display: grid;
  max-width: 52rem;
  margin-inline: auto;
  border-top: 0.08rem solid rgba(255, 255, 255, 0.28);
  grid-template-columns: repeat(2, minmax(0, 1fr));
}

.download-item {
  display: flex;
  min-height: 13rem;
  padding: 2rem;
  align-items: center;
  justify-content: space-between;
  border-bottom: 0.08rem solid rgba(255, 255, 255, 0.28);
  gap: 1.4rem;
  flex-direction: column;
}

.download-item + .download-item {
  border-left: 0.08rem solid rgba(255, 255, 255, 0.28);
}

.download-item p {
  margin-bottom: 0;
}

.authors-section {
  padding-block: clamp(5rem, 10vw, 9rem);
  background: var(--white);
}

.centered-heading {
  margin-bottom: clamp(4rem, 8vw, 7rem);
  text-align: center;
}

.author {
  display: grid;
  align-items: start;
  gap: clamp(2.5rem, 6vw, 6rem);
  grid-template-columns: minmax(14rem, 0.62fr) minmax(20rem, 1.38fr);
}

.author + .author {
  margin-top: clamp(6rem, 12vw, 11rem);
}

.author-michael .author-portrait {
  grid-column: 2;
}

.author-michael .author-copy {
  grid-row: 1;
}

.author-portrait {
  margin-bottom: 0;
}

.author-portrait img {
  width: 100%;
  max-height: 40rem;
  object-fit: cover;
  object-position: top center;
  filter: grayscale(100%);
}

.author-copy h3 {
  margin-bottom: 1.5rem;
  color: var(--teal-deep);
  font-size: 1rem;
  letter-spacing: 0.12em;
}

.author-copy p {
  color: #34474d;
}

.author-copy a {
  color: var(--teal-deep);
  overflow-wrap: anywhere;
}

.contact-section {
  padding-block: clamp(5rem, 9vw, 8rem);
  color: var(--white);
  background: var(--teal-bright);
  text-align: center;
}

.contact-inner {
  max-width: 54rem;
}

.contact-section h2 {
  color: inherit;
}

.contact-section h3 {
  margin-top: 2rem;
  margin-bottom: 0.5rem;
}

.contact-section p {
  margin-bottom: 0.2rem;
}

.buy-copy {
  margin-top: 1.6rem;
  font-size: 0.85rem;
  letter-spacing: 0.08em;
}

.contact-cta {
  margin-top: 2rem;
}

.visually-hidden {
  position: absolute;
  width: 0.0625rem;
  height: 0.0625rem;
  padding: 0;
  margin: -0.0625rem;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

.testimonials-section {
  padding-block: clamp(5rem, 10vw, 9rem);
  background: var(--white);
}

.testimonials-list {
  display: grid;
  align-items: start;
  gap: clamp(1.5rem, 3vw, 3rem);
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.testimonial {
  text-align: center;
}

.testimonial blockquote {
  margin: 0 0 1.4rem;
}

.testimonial blockquote p {
  margin-bottom: 0.9rem;
  color: var(--ink);
  font-size: 1.05rem;
  line-height: 1.65;
}

.testimonial blockquote p:last-child {
  margin-bottom: 0;
}

.testimonial h3 {
  margin-top: 0;
  margin-bottom: 0.5rem;
  color: var(--teal-deep);
}

.testimonial-affiliation {
  margin-bottom: 0;
  color: var(--muted);
  font-size: 0.8rem;
}

.site-footer {
  padding: 2.2rem 1rem;
  color: rgba(255, 255, 255, 0.82);
  background: var(--teal-deep);
  font-size: 0.72rem;
  letter-spacing: 0.06em;
  text-align: center;
  text-transform: uppercase;
}

.site-footer p {
  margin-bottom: 0;
}

@keyframes rise-in {
  from {
    opacity: 0;
    transform: translateY(0.8rem);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

@media (max-width: 52rem) {
  .hero {
    min-height: auto;
    padding: 55svh 1rem 0;
    background-position: 25% top;
    background-size: auto 55svh;
    background-repeat: no-repeat;
    grid-template-columns: 1fr;
  }

  .hero-copy {
    max-width: none;
    margin-inline: -1rem;
    padding: 3rem 1rem 3.5rem;
    background: rgba(255, 255, 255, 0.96);
    grid-column: 1;
  }

  .intro-layout,
  .book-layout,
  .author {
    grid-template-columns: 1fr;
  }

  .intro-layout {
    gap: 1.5rem;
  }

  .book-layout {
    gap: 3rem;
  }

  .book-figure img {
    max-width: 27rem;
  }

  .author-portrait {
    width: min(100%, 23rem);
    margin-inline: auto;
  }

  .author-michael .author-portrait,
  .author-michael .author-copy {
    grid-column: 1;
    grid-row: auto;
  }

  .author-michael .author-portrait {
    grid-row: 1;
  }

  .author-copy {
    max-width: 42rem;
    margin-inline: auto;
  }

  .testimonials-list {
    gap: 4rem;
    grid-template-columns: 1fr;
  }

  .testimonial {
    max-width: 34rem;
    margin-inline: auto;
  }
}

@media (max-width: 38rem) {
  .site-header {
    min-height: 5rem;
    padding-inline: 1rem;
  }

  .hero-intro {
    font-size: 1.1rem;
  }

  .hero h1 {
    font-size: clamp(2rem, 11vw, 2.8rem);
  }

  .button {
    width: 100%;
  }

  .downloads-list {
    grid-template-columns: 1fr;
  }

  .download-item + .download-item {
    border-left: 0;
  }

  .contact-cta .button {
    display: inline-flex;
    width: auto;
  }
}

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

  *,
  *::before,
  *::after {
    animation-duration: 0.01ms !important;
    animation-iteration-count: 1 !important;
    transition-duration: 0.01ms !important;
  }
}