.article-top {
  position: relative;
  padding: 84px 0 72px;
  overflow: hidden;
}

.article-top::before {
  position: absolute;
  inset: 0 0 auto;
  height: 6px;
  background: linear-gradient(90deg, var(--color-primary) 0 46%, var(--color-secondary) 46% 74%, var(--color-accent) 74%);
  content: "";
}

.breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin-bottom: 30px;
  color: var(--color-muted);
  font-size: 13px;
}

.breadcrumb a:hover {
  color: var(--color-text);
}

.breadcrumb span {
  color: var(--color-primary);
}

.article-top-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.1fr) minmax(260px, 0.9fr);
  gap: 70px;
  align-items: end;
}

.article-top h1 {
  max-width: 830px;
  margin: 15px 0 22px;
  font-size: clamp(2.7rem, 5vw, 5.9rem);
  line-height: 0.92;
  letter-spacing: -0.08em;
}

.article-lead {
  max-width: 650px;
  color: var(--color-muted);
  font-size: 18px;
}

.article-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 9px 18px;
  margin-top: 28px;
  color: var(--color-muted);
  font-size: 13px;
}

.article-top-visual {
  position: relative;
}

.article-top-visual img {
  width: 100%;
  height: 280px;
  object-fit: cover;
  box-shadow: var(--shadow-md);
}

.article-top-visual span {
  position: absolute;
  right: 14px;
  bottom: 14px;
  padding: 8px 10px;
  background: var(--color-deep);
  color: #fff;
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 12px;
}

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 820px) 230px;
  justify-content: space-between;
  gap: 70px;
  padding: 70px 0 120px;
}

.article-body {
  min-width: 0;
  font-size: 17px;
  line-height: 1.9;
}

.article-body > * + * {
  margin-top: 24px;
}

.article-body h2 {
  margin-top: 54px;
  font-size: 32px;
  line-height: 1.15;
  letter-spacing: -0.05em;
}

.article-body h3 {
  margin-top: 36px;
  font-size: 22px;
  line-height: 1.25;
}

.article-body ul,
.article-body ol {
  padding-left: 24px;
  list-style: square;
}

.article-body ol {
  list-style: decimal;
}

.article-body li + li {
  margin-top: 9px;
}

.article-body blockquote {
  margin-top: 32px;
  padding: 22px 24px;
  border-left: 4px solid var(--color-primary);
  background: var(--color-surface-muted);
  color: var(--color-ink-soft);
  font-size: 18px;
  font-weight: 700;
}

.article-body table {
  width: 100%;
  border-collapse: collapse;
  font-size: 15px;
}

.article-body th,
.article-body td {
  padding: 12px 14px;
  border: 1px solid var(--color-border);
  text-align: left;
}

.article-body th {
  background: var(--color-deep);
  color: var(--color-text);
}

.article-aside {
  position: sticky;
  top: 120px;
  align-self: start;
}

.article-aside-title {
  margin-bottom: 14px;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.12em;
  text-transform: uppercase;
}

.article-aside a {
  display: block;
  padding: 10px 0;
  border-bottom: 1px solid var(--color-border);
  color: var(--color-muted);
  font-size: 13px;
}

.article-aside a:hover {
  color: var(--color-text);
}

.article-note {
  margin-top: 40px;
  padding: 20px;
  border: 1px solid rgba(37, 228, 212, 0.45);
  background: rgba(37, 228, 212, 0.08);
  color: var(--color-ink-soft);
  font-size: 14px;
}

.article-related {
  padding: 64px 0 82px;
  border-top: 1px solid var(--color-border);
  background: var(--color-surface-muted);
}

.related-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.related-item {
  min-height: 170px;
  padding: 20px;
  border: 1px solid var(--color-border);
  background: var(--color-surface);
  transition: transform 180ms ease, box-shadow 180ms ease;
}

.related-item:hover {
  box-shadow: var(--shadow-sm);
  transform: translateY(-3px);
}

.related-item span {
  display: block;
  margin-bottom: 26px;
  color: var(--color-primary);
  font-family: ui-monospace, SFMono-Regular, Consolas, monospace;
  font-size: 12px;
}

.related-item h3 {
  font-size: 18px;
  line-height: 1.3;
}

@media (max-width: 900px) {
  .article-top-layout,
  .article-layout {
    grid-template-columns: 1fr;
    gap: 38px;
  }

  .article-aside {
    position: static;
    order: -1;
  }

  .article-aside nav {
    display: flex;
    flex-wrap: wrap;
    gap: 8px 18px;
  }

  .article-aside a {
    border-bottom: 0;
  }
}

@media (max-width: 650px) {
  .article-top {
    padding: 60px 0 52px;
  }

  .article-top h1 {
    font-size: clamp(2.8rem, 14vw, 4.6rem);
  }

  .article-lead {
    font-size: 16px;
  }

  .article-layout {
    padding: 50px 0 80px;
  }

  .article-body {
    font-size: 16px;
  }

  .article-body h2 {
    margin-top: 40px;
    font-size: 28px;
  }

  .article-body table {
    display: block;
    overflow-x: auto;
    white-space: nowrap;
  }

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