.course-page {
  overflow-x: hidden;
  background: var(--paper);
}

.course-header {
  position: relative;
  z-index: 20;
  width: min(calc(100% - 40px), 1080px);
  height: 116px;
  display: grid;
  grid-template-columns: 1fr auto auto auto;
  gap: 34px;
  align-items: center;
  margin: 0 auto;
}

.course-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-size: 18px;
  font-weight: 600;
}

.course-brand__mark {
  width: 64px;
  height: 64px;
  border-width: 5px;
}

.course-brand__mark img {
  inset: 10px;
  width: 34px;
  height: 34px;
}

.course-header > nav:not(.language-switcher) {
  display: flex;
  gap: 25px;
  font-size: 19px;
  font-weight: 300;
}

.course-header > nav:not(.language-switcher) a:hover {
  text-decoration: underline;
  text-underline-offset: 5px;
}

.course-youtube {
  box-shadow: none;
  background: #f2f2f2;
}

.course-stage {
  position: relative;
  width: min(100%, 1440px);
  min-height: 780px;
  margin: 0 auto;
  padding-top: 30px;
  overflow: hidden;
}

.course-stage__background {
  position: absolute;
  z-index: -2;
  inset: 0 0 130px;
  background:
    linear-gradient(rgba(0, 0, 0, 0.28), rgba(0, 0, 0, 0.28)),
    url("../images/home/background-overlapping.jpg") center / cover no-repeat;
}

.course-hero {
  position: relative;
  width: min(calc(100% - 40px), 960px);
  height: 560px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 420px;
  margin: 0 auto;
  overflow: hidden;
  border-radius: 68px;
  background: rgba(255, 255, 255, 0.76);
  box-shadow: 5px 7px 24px rgba(0, 0, 0, 0.18);
  backdrop-filter: blur(5px);
}

.course-hero__copy {
  display: flex;
  flex-direction: column;
  justify-content: center;
  padding: 60px;
}

.course-hero__copy > p:first-child {
  margin: 0 0 20px;
  color: #007d55;
  font-size: 16px;
  font-weight: 600;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.course-hero h1 {
  margin: 0;
  font-size: clamp(82px, 9vw, 126px);
  font-weight: 300;
  line-height: 0.88;
  letter-spacing: -0.065em;
}

html[lang="en"] .course-hero h1 {
  font-size: clamp(58px, 6vw, 82px);
  letter-spacing: -0.05em;
  white-space: nowrap;
}

.course-hero__description {
  max-width: 470px;
  margin: 34px 0 0;
  color: #414141;
  font-size: 17px;
  line-height: 1.55;
}

.course-hero__visual {
  position: relative;
  overflow: hidden;
  border-radius: 48px 68px 68px 48px;
  background: #05251c;
}

.course-hero__visual img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: transform 900ms cubic-bezier(0.2, 0.8, 0.2, 1);
}

.course-hero:hover .course-hero__visual img {
  transform: scale(1.025);
}

.course-preview {
  position: absolute;
  z-index: 4;
  right: calc(50% - 480px);
  bottom: 0;
  width: 220px;
  height: 259px;
}

.course-preview .course-card {
  position: relative;
  display: block;
  width: 220px;
  height: 259px;
  overflow: hidden;
  border: 10px solid var(--ink);
  border-radius: 26px;
  background-position: center;
  background-size: cover;
  color: var(--paper);
  isolation: isolate;
  box-shadow: 0 14px 28px rgba(0, 0, 0, 0.2);
  transition: transform 180ms ease;
}

.course-preview .course-card::before {
  position: absolute;
  z-index: -1;
  inset: 0;
  background: linear-gradient(180deg, rgba(0, 0, 0, 0.2), transparent 45%);
  content: "";
}

.course-preview .course-card:hover {
  transform: translateY(-5px);
}

.course-preview .course-card__header {
  position: absolute;
  top: 5px;
  right: 12px;
  left: 12px;
  display: grid;
  gap: 2px;
}

.course-preview .course-card__title {
  overflow: hidden;
  display: -webkit-box;
  font-size: 27px;
  font-weight: 600;
  line-height: 1.08;
  overflow-wrap: anywhere;
  -webkit-box-orient: vertical;
  -webkit-line-clamp: 2;
}

.course-preview .course-card__status {
  font-size: 16px;
  font-weight: 300;
}

.course-preview .course-card__dot {
  position: absolute;
  bottom: 8px;
  left: 50%;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: var(--ink);
  transform: translateX(-50%);
}

.course-list,
.course-license {
  width: min(calc(100% - 40px), 1080px);
  margin: 0 auto;
}

.course-list {
  padding: 104px 0 120px;
  scroll-margin-top: 30px;
}

.course-list__heading {
  display: grid;
  grid-template-columns: 0.85fr 1.15fr;
  gap: 70px;
  align-items: end;
  margin-bottom: 55px;
}

.course-list__heading h2,
.course-license h2 {
  margin: 0;
  color: var(--brand-color);
  font-weight: 300;
  line-height: 1.12;
}

.course-list__heading h2 {
  font-size: clamp(50px, 6vw, 78px);
  letter-spacing: -0.05em;
}

.course-list__heading p {
  margin: 0;
  color: #535353;
  font-size: 18px;
  line-height: 1.6;
}

.chapter-cards {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 18px;
}

.chapter-card {
  min-height: 430px;
  display: flex;
  flex-direction: column;
  padding: 28px;
  border: 4px solid var(--ink);
  border-radius: 30px;
  background: var(--paper);
  transition: background 180ms ease, box-shadow 180ms ease, transform 180ms ease;
}

.chapter-card:nth-child(1) {
  --chapter-card-color: #ff7eb1;
}

.chapter-card:nth-child(2) {
  --chapter-card-color: #ffad43;
}

.chapter-card:nth-child(3) {
  --chapter-card-color: #55e59a;
}

.chapter-card:nth-child(4) {
  --chapter-card-color: #7ec8ff;
}

.chapter-card:nth-child(5) {
  --chapter-card-color: #c49aff;
}

.chapter-card:nth-child(6) {
  --chapter-card-color: #ff9a72;
}

.chapter-card:nth-child(7) {
  --chapter-card-color: #ffe45e;
}

.chapter-card:nth-child(8) {
  --chapter-card-color: #6fe0dc;
}

.chapter-card:nth-child(9) {
  --chapter-card-color: #a5ef6b;
}

.chapter-card:hover,
.chapter-card:focus-visible {
  background: var(--chapter-card-color);
  box-shadow: 0 18px 38px rgba(0, 0, 0, 0.16);
  outline: 0;
  transform: translateY(-6px);
}

.chapter-card__number {
  width: 52px;
  height: 52px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  font-size: 13px;
  font-weight: 700;
}

.chapter-card h3 {
  margin: auto 0 18px;
  font-size: clamp(27px, 3vw, 37px);
  line-height: 1.04;
  letter-spacing: -0.04em;
}

.chapter-card p {
  margin: 0;
  line-height: 1.5;
}

.chapter-card__meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 26px;
  padding-top: 16px;
  border-top: 2px solid rgba(0, 0, 0, 0.3);
  font-size: 12px;
  font-weight: 700;
}

.course-license {
  padding: 20px 0 115px;
}

.source-credit {
  margin-bottom: 88px;
  font-family: "Roboto Mono", monospace;
  font-size: 18px;
  line-height: 1.45;
}

.source-credit p {
  max-width: 850px;
  margin: 0;
}

.source-credit a:hover,
.license-section a:hover,
.attribution-details a:hover {
  text-decoration: underline;
  text-underline-offset: 4px;
}

.source-credit__marks {
  display: flex;
  gap: 3px;
  width: max-content;
  margin-top: 4px;
}

.source-credit__marks img {
  width: 36px;
  height: 36px;
}

.license-section + .license-section {
  margin-top: 102px;
}

.course-license h2 {
  max-width: 870px;
  margin-bottom: 72px;
  font-size: clamp(34px, 4vw, 49px);
}

.license-section p {
  max-width: 960px;
  margin: 0 0 36px;
  font-size: 21px;
  font-weight: 300;
  line-height: 1.42;
}

.license-section p:last-child {
  margin-bottom: 0;
}

.license-section a {
  text-decoration: underline;
  text-underline-offset: 3px;
}

.attribution-resources {
  scroll-margin-top: 32px;
}

.attribution-details {
  max-width: 960px;
  overflow: hidden;
  border: 2px solid var(--ink);
  border-radius: 22px;
  background: var(--paper);
}

.attribution-details summary {
  padding: 22px 58px 22px 24px;
  position: relative;
  cursor: pointer;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  list-style: none;
}

.attribution-details summary::-webkit-details-marker {
  display: none;
}

.attribution-details summary::after {
  width: 28px;
  height: 28px;
  display: grid;
  position: absolute;
  top: 50%;
  right: 20px;
  place-items: center;
  border-radius: 50%;
  background: var(--ink);
  color: var(--paper);
  content: "+";
  transform: translateY(-50%);
}

.attribution-details[open] summary::after {
  content: "−";
}

.attribution-details summary:focus-visible {
  outline: 3px solid var(--brand-color);
  outline-offset: -5px;
}

.attribution-details__content {
  padding: 4px 24px 28px;
  border-top: 1px solid rgba(0, 0, 0, 0.16);
}

.attribution-details__content h3 {
  margin: 28px 0 12px;
  font-size: 20px;
  line-height: 1.3;
}

.license-section .attribution-details__note {
  margin-bottom: 16px;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.55;
}

.attribution-list {
  margin: 0;
  padding-left: 1.25em;
  color: #353535;
  font-size: 15px;
  line-height: 1.6;
}

.attribution-list li + li {
  margin-top: 10px;
}

.attribution-list li {
  scroll-margin-top: 28px;
}

@media (max-width: 980px) {
  .course-header {
    grid-template-columns: 1fr auto auto;
  }

  .course-youtube {
    display: none;
  }

  .course-hero {
    grid-template-columns: minmax(0, 1fr) 36%;
  }

  .course-hero__copy {
    padding: 40px;
  }

  .course-preview {
    right: 40px;
  }

  .course-list__heading {
    grid-template-columns: 1fr;
    gap: 28px;
  }

  .chapter-cards {
    grid-template-columns: 1fr;
  }

  .chapter-card {
    min-height: 315px;
  }
}

@media (max-width: 680px) {
  .course-header {
    height: 92px;
    grid-template-columns: 1fr auto auto;
    gap: 12px;
  }

  .course-brand > span:last-child,
  .course-header > nav:not(.language-switcher) a:nth-child(2) {
    display: none;
  }

  .course-brand__mark {
    width: 54px;
    height: 54px;
  }

  .course-header > nav:not(.language-switcher) {
    gap: 16px;
    font-size: 15px;
  }

  .course-stage {
    min-height: 830px;
    padding-top: 14px;
  }

  .course-hero {
    height: 660px;
    grid-template-columns: 1fr;
    grid-template-rows: 330px 330px;
    border-radius: 38px;
  }

  .course-hero__copy {
    padding: 28px;
  }

  .course-hero h1 {
    font-size: clamp(70px, 22vw, 100px);
  }

  html[lang="en"] .course-hero h1 {
    font-size: clamp(50px, 15vw, 66px);
  }

  .course-hero__description {
    margin-top: 24px;
    font-size: 15px;
  }

  .course-hero__visual {
    border-radius: 38px;
  }

  .course-preview {
    right: 30px;
    bottom: 2px;
    transform: scale(0.68);
    transform-origin: right bottom;
  }

  .course-list {
    padding: 74px 0 88px;
  }

  .course-license {
    padding-bottom: 78px;
  }

  .source-credit {
    margin-bottom: 70px;
    font-size: 14px;
  }

  .course-license h2 {
    margin-bottom: 40px;
    font-size: 34px;
  }

  .license-section + .license-section {
    margin-top: 78px;
  }

  .license-section p {
    margin-bottom: 28px;
    font-size: 18px;
  }

  .attribution-details summary {
    padding: 18px 54px 18px 18px;
    font-size: 15px;
  }

  .attribution-details__content {
    padding: 2px 18px 22px;
  }
}