.course-landing {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 340px;
  gap: 56px;
  align-items: start;
  padding: 56px 0 96px;
}

.course-main {
  min-width: 0;
}

.course-detail {
  max-width: 780px;
  padding: 0 0 40px;
}

.course-detail h1 {
  margin: 0 0 20px;
  font-size: clamp(2.5rem, 6vw, 5rem);
  line-height: 0.98;
  letter-spacing: 0;
}

.course-detail p {
  font-size: 1.12rem;
}

.lead {
  color: var(--muted);
  font-size: 1.24rem;
}

.enroll-panel {
  position: sticky;
  top: 24px;
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
  padding: 16px;
}

.preview-trigger {
  position: relative;
  display: block;
  width: 100%;
  margin: 0 0 16px;
  padding: 0;
  overflow: hidden;
  border: 0;
  border-radius: 6px;
  background: #101820;
  color: #fff;
  cursor: pointer;
  text-align: left;
}

.preview-trigger img {
  display: block;
  width: 100%;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  transition: transform 180ms ease;
}

.preview-trigger:hover img,
.preview-trigger:focus-visible img {
  transform: scale(1.03);
}

.preview-trigger:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.preview-overlay {
  position: absolute;
  inset: 0;
  display: grid;
  place-items: center;
  gap: 8px;
  padding: 18px;
  background: rgba(16, 24, 32, 0.06);
  color: #fff;
  font-weight: 800;
  text-align: center;
  text-shadow: 0 2px 10px rgba(16, 24, 32, 0.82);
}

.preview-overlay-text {
  padding: 4px 8px;
  border-radius: 4px;
  background: rgba(16, 24, 32, 0.18);
}

.play-icon {
  display: block;
  width: 46px;
  height: 46px;
  border-radius: 50%;
  background: #fff;
  position: relative;
}

.play-icon::before {
  position: absolute;
  top: 50%;
  left: 54%;
  width: 0;
  height: 0;
  border-top: 10px solid transparent;
  border-bottom: 10px solid transparent;
  border-left: 15px solid #101820;
  content: "";
  transform: translate(-50%, -50%);
}

.enroll-panel h2 {
  margin: 0 0 16px;
  font-size: 1.1rem;
  line-height: 1.25;
}

.enroll-panel .button-link {
  width: 100%;
}

.learn-section {
  max-width: 820px;
  margin-bottom: 44px;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.learn-section h2,
.preview-videos h2,
.course-section h2,
.course-faqs h2 {
  margin: 0 0 16px;
  font-size: 1.8rem;
  line-height: 1.2;
}

.learn-section ul {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px 24px;
  margin: 0;
  padding-left: 20px;
}

.learn-section li {
  padding-left: 4px;
}

.course-sections {
  display: grid;
  gap: 44px;
  max-width: 820px;
}

.course-section {
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.course-faqs {
  max-width: 820px;
  margin-top: 44px;
  border-top: 1px solid var(--line);
  padding-top: 28px;
}

.faq-list {
  display: grid;
  gap: 10px;
}

.faq-item {
  border: 1px solid var(--line);
  border-radius: 8px;
  background: #fff;
}

.faq-item summary {
  position: relative;
  display: block;
  padding: 16px 44px 16px 16px;
  font-weight: 800;
  cursor: pointer;
}

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

.faq-item summary::after {
  position: absolute;
  top: 50%;
  right: 18px;
  width: 10px;
  height: 10px;
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  content: "";
  transform: translateY(-65%) rotate(45deg);
  transition: transform 160ms ease;
}

.faq-item[open] summary::after {
  transform: translateY(-35%) rotate(225deg);
}

.faq-item summary:focus-visible {
  outline: 3px solid var(--accent);
  outline-offset: 3px;
}

.faq-answer {
  border-top: 1px solid var(--line);
  padding: 16px;
}

.content-body > *:first-child {
  margin-top: 0;
}

.content-body > *:last-child {
  margin-bottom: 0;
}

.content-body blockquote {
  margin: 24px 0;
  border-left: 4px solid var(--accent);
  padding-left: 18px;
  color: var(--muted);
}

.content-body img {
  display: block;
  max-width: 100%;
  height: auto;
  margin: 24px 0;
  border-radius: 8px;
}

.content-body p > img:only-child {
  margin: 0;
}

.content-body .media-block,
.content-body .video-block {
  margin: 28px 0;
}

.content-body pre {
  overflow-x: auto;
  border-radius: 8px;
  background: #101820;
  color: #f7f3ea;
  padding: 16px;
}

.content-body code {
  font-size: 0.95em;
}

.content-body table {
  width: 100%;
  border-collapse: collapse;
  margin: 24px 0;
}

.content-body th,
.content-body td {
  border: 1px solid var(--line);
  padding: 10px 12px;
  text-align: left;
  vertical-align: top;
}

.media-block {
  margin: 28px 0;
}

.media-block img {
  display: block;
  width: 100%;
  border-radius: 8px;
}

.media-block figcaption {
  margin-top: 8px;
  color: var(--muted);
  font-size: 0.92rem;
}

.video-block {
  aspect-ratio: 16 / 9;
  margin: 28px 0;
  overflow: hidden;
  border-radius: 8px;
  background: #101820;
}

.video-block iframe,
.video-block video {
  display: block;
  width: 100%;
  height: 100%;
  border: 0;
}

.promo-dialog[hidden] {
  display: none;
}

.promo-dialog {
  position: fixed;
  inset: 0;
  z-index: 50;
  display: grid;
  place-items: center;
  padding: 24px;
}

.promo-dialog-backdrop {
  position: absolute;
  inset: 0;
  background: rgba(16, 24, 32, 0.72);
}

.promo-dialog-panel {
  position: relative;
  z-index: 1;
  width: min(960px, 100%);
  border-radius: 8px;
  background: #fff;
  padding: 18px;
  box-shadow: 0 24px 80px rgba(16, 24, 32, 0.28);
}

.promo-dialog-panel h2 {
  margin: 0 44px 14px 0;
  font-size: 1.25rem;
  line-height: 1.3;
}

.promo-dialog-panel .video-block {
  margin: 0;
}

.promo-dialog-close {
  position: absolute;
  top: 12px;
  right: 12px;
  width: 36px;
  height: 36px;
  min-width: 36px;
  min-height: 36px;
  border: 1px solid var(--line);
  border-radius: 999px;
  background: #fff;
  color: var(--ink);
  cursor: pointer;
  padding: 0;
}

.promo-dialog-close::before,
.promo-dialog-close::after {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 16px;
  height: 2px;
  border-radius: 999px;
  background: var(--ink);
  content: "";
  transform-origin: center;
}

.promo-dialog-close::before {
  transform: translate(-50%, -50%) rotate(45deg);
}

.promo-dialog-close::after {
  transform: translate(-50%, -50%) rotate(-45deg);
}

.promo-dialog-open {
  overflow: hidden;
}

@media (max-width: 900px) {
  .course-landing {
    grid-template-columns: 1fr;
    gap: 32px;
    padding-top: 36px;
  }

  .course-main {
    order: 2;
  }

  .enroll-panel {
    top: 0;
    z-index: 2;
    order: 1;
    display: grid;
    grid-template-columns: 96px minmax(0, 1fr) auto;
    gap: 12px;
    align-items: center;
    margin: 0 -16px;
    border-right: 0;
    border-left: 0;
    border-radius: 0;
  }

  .preview-trigger {
    margin: 0;
  }

  .preview-overlay {
    gap: 0;
    padding: 0;
  }

  .preview-overlay-text {
    display: none;
  }

  .play-icon {
    width: 34px;
    height: 34px;
  }

  .play-icon::before {
    border-top-width: 8px;
    border-bottom-width: 8px;
    border-left-width: 12px;
  }

  .enroll-panel h2 {
    margin: 0;
    overflow: hidden;
    font-size: 0.95rem;
    display: -webkit-box;
    -webkit-box-orient: vertical;
    -webkit-line-clamp: 2;
  }

  .enroll-panel .button-link {
    width: auto;
    min-width: 96px;
    white-space: nowrap;
  }
}

@media (max-width: 640px) {
  .learn-section ul {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 420px) {
  .enroll-panel {
    grid-template-columns: 84px minmax(0, 1fr) auto;
    gap: 10px;
  }

  .enroll-panel .button-link {
    min-width: 80px;
    padding-right: 12px;
    padding-left: 12px;
  }
}