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

:root {
  --color-bg: #ffffff;
  --color-text: #000000;
  --color-muted: #575757;
  --color-accent: #f45f00;
  --color-border: rgba(0, 0, 0, 0.1);
  --sidebar-width: 250px;
}

html,
body {
  margin: 0;
  padding: 0;
  background: var(--color-bg);
  color: var(--color-text);
  font-family: "Rethink Sans", system-ui, -apple-system, "Segoe UI", sans-serif;
  line-height: 1.5;
}

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

a {
  color: inherit;
  text-decoration: none;
}

.page {
  display: flex;
  min-height: 100vh;
  background: var(--color-bg);
}

.sidebar {
  position: sticky;
  top: 0;
  display: flex;
  flex-direction: column;
  gap: 24px;
  width: var(--sidebar-width);
  padding: 0 20px 30px 32px;
  border-right: 1px solid var(--color-border);
  background: var(--color-bg);
  height: 100vh;
  overflow-y: auto;
}

.sidebar__logo {
  padding: 30px 0;
  border-bottom: 1px solid var(--color-border);
}

.sidebar__nav {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-bottom: 30px;
  border-bottom: 1px solid var(--color-border);
}

.sidebar__nav a {
  display: flex;
  align-items: center;
  justify-content: space-between;
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.3px;
  padding: 6px 0;
  color: var(--color-text);
}

.sidebar__index {
  color: var(--color-muted);
  font-size: 10px;
  letter-spacing: -0.2px;
}

.sidebar__links {
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-weight: 500;
  font-size: 15px;
  letter-spacing: -0.3px;
  color: var(--color-muted);
}

.sidebar__links a {
  color: inherit;
}

.content {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.hero img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

main {
  padding-bottom: 120px;
}

section {
  border-left: 1px solid var(--color-border);
  border-top: 1px solid transparent;
  padding: 32px;
  max-width: 1030px;
}

.intro {
  border-left: 1px solid var(--color-border);
  border-top: none;
}

.intro__text {
  display: flex;
  flex-direction: column;
  gap: 20px;
  max-width: 1000px;
}

.intro h1 {
  font-size: 60px;
  line-height: 1.1;
  margin: 0;
}

.intro p {
  margin: 0;
  font-size: 15px;
  letter-spacing: -0.15px;
  color: var(--color-muted);
}

.toc {
  border-top: 1px solid var(--color-border);
  display: flex;
  align-items: flex-start;
  gap: 32px;
}

.toc h2 {
  margin: 0;
  font-size: 30px;
  font-weight: 500;
  line-height: 1.2;
}

.toc ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
  font-size: 30px;
  font-weight: 500;
  letter-spacing: -0.6px;
}

.toc li span {
  color: var(--color-muted);
}

.section header h2 {
  margin: 0 0 24px;
  font-size: 60px;
  font-weight: 500;
  line-height: 1.1;
  display: inline-flex;
  gap: 12px;
  align-items: baseline;
}

.section header h2 span:first-child {
  color: var(--color-accent);
}

.section p {
  color: var(--color-muted);
  font-size: 15px;
  letter-spacing: -0.15px;
}

.section__body {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.section__body figure {
  margin: 0;
}

.section__media {
  margin: 32px 0;
}

.section__grid {
  margin-top: 32px;
  border-top: 1px solid var(--color-border);
  padding-top: 32px;
}

.section__grid h3 {
  font-size: 22px;
  font-weight: 600;
  margin: 0 0 20px;
}

.section__grid--tone ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.section__grid--tone strong {
  font-weight: 700;
  color: var(--color-text);
}

.card-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 32px;
}

.card-grid article {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.card-grid h4 {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: -0.15px;
  color: var(--color-text);
}

.card-grid p {
  margin: 0;
}

.gallery {
  display: grid;
  gap: 40px;
  margin-top: 40px;
}

.gallery__group h3 {
  margin: 0 0 20px;
  font-size: 22px;
  font-weight: 600;
}

.gallery__group--grid .gallery__tiles {
  display: grid;
  gap: 20px;
  grid-template-columns: repeat(3, minmax(0, 1fr));
}

.gallery__tiles figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.gallery__tiles figcaption {
  display: flex;
  gap: 8px;
  align-items: center;
  font-size: 13px;
  color: var(--color-text);
  letter-spacing: -0.13px;
}

.gallery__tiles figcaption img {
  width: 16px;
  height: 16px;
}

.palette {
  display: grid;
  gap: 64px;
  margin-top: 40px;
}

.palette__group h3 {
  margin: 0 0 24px;
  font-size: 22px;
  font-weight: 600;
}

.swatches {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 24px;
}

.swatches--wrap {
  grid-template-columns: repeat(4, minmax(0, 1fr));
}

.swatch {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
  letter-spacing: -0.13px;
}

.swatch__color {
  display: block;
  width: 100%;
  padding-top: 100%;
  border-radius: 1000px;
  background: var(--swatch);
  border: 1px solid transparent;
}

.swatch__color--border {
  border-color: var(--color-text);
}

.swatch__code {
  color: var(--color-muted);
}

.gradients {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.gradients figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
  font-size: 13px;
  letter-spacing: -0.13px;
}

.section--typography .highlight {
  color: var(--color-accent);
  font-weight: 500;
}

.type-details {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 40px;
  margin-top: 60px;
}

.type-details__group h3 {
  margin: 0 0 16px;
  font-size: 22px;
  font-weight: 600;
}

.type-details__sample {
  margin: 0;
  font-size: 60px;
  letter-spacing: -1.2px;
}

.type-details__sample--sans {
  font-family: "Rethink Sans", sans-serif;
}

.type-details__sample--serif {
  font-family: "Hedvig Letters Serif", serif;
  font-weight: 400;
}

.type-sizing {
  margin-top: 80px;
  border-top: 1px solid var(--color-border);
  padding-top: 40px;
}

.type-sizing h3 {
  margin: 0 0 20px;
  font-size: 22px;
  font-weight: 600;
}

.type-sizing p {
  margin: 0 0 32px;
}

.type-sizing ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 40px;
}

.type-sizing__heading {
  margin: 0 0 20px;
  font-family: "Rethink Sans", sans-serif;
  color: var(--color-text);
}

.type-sizing__meta {
  display: flex;
  gap: 20px;
  font-size: 13px;
  color: var(--color-muted);
  letter-spacing: -0.13px;
}

.size--xl {
  font-size: 50px;
  line-height: 1.1;
}

.size--lg {
  font-size: 32px;
  line-height: 1.1;
}

.size--md {
  font-size: 20px;
}

.size--sm {
  font-family: "Hedvig Letters Serif", serif;
  font-size: 16px;
  line-height: 1.4;
}

.section--art {
  padding-bottom: 0;
}

.photo-grid {
  margin-top: 40px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 32px;
}

.photo-grid figure {
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.photo-grid figcaption {
  display: flex;
  flex-direction: column;
  gap: 8px;
  font-size: 13px;
  letter-spacing: -0.13px;
  color: var(--color-muted);
}

.photo-grid figcaption strong {
  color: var(--color-text);
  font-weight: 600;
}

.footer {
  margin-top: auto;
  border-top: 1px solid var(--color-border);
  padding: 128px 40px 32px;
  display: flex;
  flex-direction: column;
  gap: 40px;
}

.footer__top {
  display: flex;
  align-items: flex-end;
  gap: 32px;
}

.footer__logo img {
  max-width: 350px;
}

.footer__links {
  display: flex;
  gap: 32px;
  font-size: 15px;
  font-weight: 500;
}

.footer__top-link {
  color: var(--color-text);
}

.footer__bottom {
  border-top: 1px solid var(--color-border);
  padding-top: 40px;
  display: flex;
  justify-content: space-between;
  align-items: center;
  font-size: 13px;
  color: var(--color-text);
  letter-spacing: -0.13px;
}

.footer__legal {
  display: flex;
  align-items: center;
  gap: 16px;
}

.footer__legal a {
  color: inherit;
}

@media (max-width: 1200px) {
  .page {
    flex-direction: column;
  }

  .sidebar {
    position: static;
    width: 100%;
    height: auto;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .content {
    width: 100%;
  }

  section {
    max-width: none;
  }

  .card-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .gallery__group--grid .gallery__tiles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .swatches,
  .swatches--wrap {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .type-details {
    grid-template-columns: 1fr;
  }

  .photo-grid {
    grid-template-columns: 1fr;
  }

  .footer__top {
    flex-direction: column;
    align-items: flex-start;
  }

  .footer__links {
    flex-wrap: wrap;
  }

  .footer__bottom {
    flex-direction: column;
    gap: 16px;
    align-items: flex-start;
  }
}

@media (max-width: 768px) {
  .intro h1 {
    font-size: 42px;
  }

  .section header h2 {
    font-size: 42px;
  }

  .toc {
    flex-direction: column;
  }

  .toc ol {
    font-size: 24px;
  }

  .card-grid {
    grid-template-columns: 1fr;
  }

  .gallery__group--grid .gallery__tiles {
    grid-template-columns: 1fr;
  }

  .gradients {
    grid-template-columns: 1fr;
  }

  .swatches,
  .swatches--wrap {
    grid-template-columns: 1fr 1fr;
  }
}