.series-hero {
  position: relative;
  background: var(--cd-hero-bg);
}

.series-hero::after {
  content: "";
  position: absolute;
  bottom: -7px;
  left: 50%;
  width: min(780px, 76vw);
  height: 14px;
  background:
    radial-gradient(ellipse at 50% 50%, rgba(45, 212, 191, 0.28), transparent 56%),
    linear-gradient(90deg, transparent, rgba(17, 122, 114, 0.26), rgba(49, 95, 159, 0.18), transparent);
  background-repeat: no-repeat;
  background-position: center;
  background-size: 100% 14px, 100% 1px;
  transform: translateX(-50%);
  pointer-events: none;
}

.series-hero-inner {
  display: grid;
  grid-template-columns: minmax(0, 1.16fr) minmax(280px, 0.84fr);
  gap: 34px;
  align-items: center;
  max-width: 1160px;
  margin: 0 auto;
  padding: 64px 22px 50px;
}

.series-eyebrow {
  margin: 0 0 14px;
  color: var(--cd-accent);
  font-size: 14px;
  font-weight: 850;
  letter-spacing: 0;
  text-transform: uppercase;
}

.series-title {
  max-width: 900px;
  margin: 0;
  color: var(--cd-ink);
  font-size: clamp(29px, 3.2vw, 40px);
  font-weight: 900;
  letter-spacing: 0;
  line-height: 1.12;
}

.series-lead {
  max-width: 760px;
  margin: 22px 0 0;
  color: var(--cd-muted);
  font-size: 19px;
  line-height: 1.72;
}

.series-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.series-actions .button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-height: 42px;
  padding: 9px 16px;
  border: 1px solid var(--cd-accent);
  border-radius: 8px;
  background: var(--cd-accent);
  color: #ffffff;
  font-weight: 760;
  text-decoration: none;
}

.series-actions .button.secondary {
  border-color: rgba(17, 122, 114, 0.32);
  background: var(--cd-control-bg);
  color: var(--cd-accent);
}

.series-summary {
  border: 1px solid rgba(17, 122, 114, 0.26);
  border-radius: 8px;
  background: var(--cd-panel-alpha);
  box-shadow: var(--cd-shadow);
  overflow: hidden;
}

.series-summary-head {
  padding: 16px 18px;
  border-bottom: 1px solid rgba(17, 122, 114, 0.18);
  background: var(--cd-accent-soft);
  color: var(--cd-ink);
  font-weight: 850;
}

.series-summary-body {
  display: grid;
  gap: 1px;
  background: var(--cd-line);
}

.series-summary-row {
  display: grid;
  grid-template-columns: 112px minmax(0, 1fr);
  gap: 12px;
  padding: 15px 18px;
  background: var(--cd-panel);
}

.series-summary-row strong {
  color: var(--cd-accent);
}

.series-layout {
  display: grid;
  grid-template-columns: 250px minmax(0, 1fr);
  gap: 42px;
  max-width: 1120px;
  margin: 0 auto;
  padding: 48px 28px 84px;
}

.series-toc {
  position: sticky;
  top: 82px;
  align-self: start;
  padding: 16px;
  border: 1px solid var(--cd-line);
  border-radius: 8px;
  background: var(--cd-panel);
}

.series-toc-title {
  margin: 0 0 10px;
  color: var(--cd-muted);
  font-size: 13px;
  font-weight: 850;
}

.series-toc a {
  display: block;
  padding: 7px 0;
  color: var(--cd-ink);
  font-size: 14px;
  text-decoration: none;
}

.article-content,
.series-article {
  min-width: 0;
  max-width: 820px;
}

.article-content section,
.series-article section {
  position: relative;
  padding: 42px 0;
}

.article-content section:first-child,
.series-article section:first-child {
  padding-top: 0;
}

.article-content section::after,
.series-article section::after {
  content: "";
  position: absolute;
  bottom: -6px;
  left: 50%;
  width: min(620px, 78%);
  height: 12px;
  background: linear-gradient(90deg, transparent, rgba(17, 122, 114, 0.2), rgba(49, 95, 159, 0.16), transparent);
  transform: translateX(-50%);
  pointer-events: none;
}

.article-content section:last-child::after,
.series-article section:last-child::after {
  display: none;
}

.article-content h2,
.article-content h3,
.series-article h2,
.series-article h3 {
  color: var(--cd-ink);
  letter-spacing: 0;
  line-height: 1.28;
}

.article-content h2,
.series-article h2 {
  margin: 0 0 24px;
  font-size: clamp(25px, 2.4vw, 33px);
  font-weight: 840;
}

.article-content h3,
.series-article h3 {
  margin: 34px 0 16px;
  font-size: 21px;
  font-weight: 820;
}

.article-content p,
.article-content li,
.article-content td,
.series-article p,
.series-article li,
.series-article td {
  color: var(--cd-ink);
  font-size: 18px;
  line-height: 1.92;
}

.article-content p,
.series-article p {
  margin: 0 0 20px;
}

.article-content ul,
.article-content ol,
.series-article ul,
.series-article ol {
  margin: 18px 0 26px 1.45rem;
  padding-left: 0.8rem;
}

.article-content li,
.series-article li {
  margin: 0 0 0.72em;
  padding-left: 0.18rem;
}

.article-content li:last-child,
.series-article li:last-child {
  margin-bottom: 0;
}

.series-callout {
  margin: 20px 0;
  padding: 18px;
  border-left: 5px solid var(--cd-accent);
  border-radius: 8px;
  background: var(--cd-soft);
}

.series-callout.warn {
  border-left-color: var(--cd-warm);
  background: var(--cd-soft-2);
}

.series-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 20px 0;
}

.series-card {
  padding: 18px;
  border: 1px solid var(--cd-line);
  border-radius: 8px;
  background: var(--cd-panel);
}

.series-card h3 {
  margin-top: 0;
  font-size: 18px;
}

.blueprint-figure {
  margin: 22px 0;
  border: 1px solid rgba(49, 95, 159, 0.28);
  border-radius: 8px;
  background: #0c1422;
  overflow: hidden;
}

.blueprint-figure img {
  display: block;
  width: 100%;
  height: auto;
}

.blueprint-figure figcaption {
  padding: 11px 14px;
  border-top: 1px solid rgba(145, 167, 208, 0.22);
  color: #b9c7dd;
  font-size: 14px;
}

.series-table-wrap {
  overflow-x: auto;
  margin: 24px 0 32px;
  border: 1px solid var(--cd-line);
  border-radius: 8px;
  background: var(--cd-panel);
}

.series-table-wrap table {
  width: 100%;
  min-width: 720px;
  border-collapse: collapse;
}

.series-table-wrap th,
.series-table-wrap td {
  padding: 13px 15px;
  border-bottom: 1px solid var(--cd-line);
  text-align: left;
  vertical-align: top;
}

.series-table-wrap th {
  background: var(--cd-table-head-bg);
  font-size: 14px;
}

.series-table-wrap tr:last-child td {
  border-bottom: 0;
}

.article-content .table-container,
.series-article .table-container {
  margin: 24px 0 32px;
}

.article-content table td,
.article-content table th,
.series-article table td,
.series-article table th {
  padding: 14px 16px;
  vertical-align: top;
}

.series-article pre,
.article-content pre,
.article-content pre[class*="language-"],
.series-article pre[class*="language-"] {
  margin: 24px 0 30px;
  padding: 20px;
  border-radius: 8px;
  background: var(--cd-code);
  color: var(--cd-code-ink);
  overflow-x: auto;
  line-height: 1.65;
  tab-size: 4;
  text-shadow: none;
}

.article-content code,
.series-article code {
  font-family: ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, "Liberation Mono", monospace;
}

.article-content :not(pre) > code,
.series-article :not(pre) > code {
  padding: 0.08em 0.32em;
  border-radius: 5px;
  color: var(--cd-warm);
  background: var(--cd-inline-code-bg);
  font-size: 0.9em;
  white-space: nowrap;
}

.series-nav {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 28px;
}

.series-nav a {
  display: block;
  padding: 16px;
  border: 1px solid var(--cd-line);
  border-radius: 8px;
  background: var(--cd-panel);
  color: var(--cd-ink);
  text-decoration: none;
}

.series-nav span {
  display: block;
  margin-bottom: 5px;
  color: var(--cd-muted);
  font-size: 13px;
  font-weight: 800;
}

.series-nav strong {
  color: var(--cd-accent);
}

@media (max-width: 920px) {
  .series-hero-inner,
  .series-layout {
    grid-template-columns: 1fr;
  }

  .series-toc {
    position: static;
  }
}

@media (max-width: 640px) {
  .series-summary-row,
  .series-grid,
  .series-nav {
    grid-template-columns: 1fr;
  }

  .series-title {
    font-size: 31px;
  }

  .series-lead {
    font-size: 17px;
  }
}