:root {
  --card: #FFFFFF;
  --shadow: 0 16px 40px rgba(20, 63, 116, 0.08);
}

body {
  background: linear-gradient(180deg, #fbfdff 0%, #f4f8fc 100%);
  line-height: 1.75;
}

a { color: inherit; }

.nav-brand-link { text-decoration: none; }

.brand-version {
  font-size: 10px;
  background: rgba(110, 176, 194, 0.25);
  padding: 1px 5px;
  border-radius: 4px;
}

.article-page { padding-bottom: 72px; }

.article-hero {
  margin-top: calc(var(--compliance-h) + var(--nav-h));
  background:
    radial-gradient(circle at top left, rgba(110, 176, 194, 0.18), transparent 30%),
    radial-gradient(circle at right center, rgba(47, 120, 173, 0.14), transparent 28%),
    linear-gradient(180deg, #f8fbff 0%, #eef5ff 100%);
  border-bottom: 1px solid rgba(47, 120, 173, 0.08);
}

.article-hero-inner,
.article-shell {
  max-width: 1200px;
  margin: 0 auto;
}

.article-hero-inner {
  padding: 40px 32px 36px;
}

.back-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  text-decoration: none;
  color: var(--blue);
  font-size: 13px;
  font-weight: 700;
  margin-bottom: 18px;
}

.back-link:hover { color: var(--navy); }

.article-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 6px 12px;
  background: rgba(47, 120, 173, 0.08);
  color: var(--blue);
  border: 1px solid rgba(47, 120, 173, 0.12);
  font-size: 12px;
  font-weight: 800;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  margin-bottom: 16px;
}

.article-title {
  font-family: var(--font-display);
  font-size: clamp(30px, 5vw, 44px);
  line-height: 1.2;
  color: var(--navy);
  margin-bottom: 14px;
}

.article-sub {
  max-width: 760px;
  color: var(--text2);
  font-size: 15px;
  line-height: 1.9;
}

.article-meta {
  margin-top: 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.article-meta span {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  padding: 8px 12px;
  border-radius: 999px;
  background: rgba(255, 255, 255, 0.8);
  border: 1px solid rgba(47, 120, 173, 0.1);
  color: var(--text2);
  font-size: 12px;
  font-weight: 700;
}

.article-shell { padding: 28px 32px 0; }

.article-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr) 300px;
  gap: 24px;
  align-items: start;
}

.article-main { display: grid; gap: 20px; }

.article-card,
.toc-card,
.article-note,
.article-table-wrap {
  background: var(--card);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
}

.article-card {
  padding: 26px 28px;
}

.article-card h2 {
  font-family: var(--font-display);
  color: var(--navy);
  font-size: 28px;
  margin-bottom: 18px;
}

.article-card h3 {
  color: var(--text);
  font-size: 18px;
  margin-top: 20px;
  margin-bottom: 10px;
}

.article-card p + p { margin-top: 12px; }
.article-card ul,
.article-card ol { margin: 12px 0 0 20px; }
.article-card li + li { margin-top: 8px; }

.article-lead {
  font-size: 16px;
  color: var(--text2);
}

.article-note {
  padding: 18px 20px;
  background: linear-gradient(135deg, rgba(47, 120, 173, 0.08), rgba(110, 176, 194, 0.08));
}

.article-note strong {
  display: block;
  color: var(--navy);
  margin-bottom: 8px;
}

.metric-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin-top: 18px;
}

.metric-card {
  border-radius: 16px;
  border: 1px solid rgba(47, 120, 173, 0.1);
  background: linear-gradient(180deg, #f8fbff, #ffffff);
  padding: 16px;
}

.metric-card .k {
  font-size: 12px;
  color: var(--neutral);
  margin-bottom: 8px;
}

.metric-card .v {
  color: var(--navy);
  font-size: 20px;
  font-weight: 900;
  margin-bottom: 6px;
}

.metric-card p {
  font-size: 12px;
  color: var(--text2);
}

.article-table-wrap {
  overflow-x: auto;
  margin-top: 16px;
}

.article-table {
  width: 100%;
  border-collapse: collapse;
  min-width: 560px;
}

.article-table th,
.article-table td {
  padding: 12px 14px;
  border-bottom: 1px solid var(--border);
  text-align: left;
  font-size: 13px;
  vertical-align: top;
}

.article-table th {
  color: var(--blue);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.pill-row {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 14px;
}

.pill-row span {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(47, 120, 173, 0.08);
  color: var(--blue);
  border: 1px solid rgba(47, 120, 173, 0.12);
  font-size: 12px;
  font-weight: 700;
}

.article-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px;
  margin-top: 18px;
}

.article-pane {
  border-radius: 16px;
  border: 1px solid rgba(47, 120, 173, 0.08);
  background: #f9fbff;
  padding: 18px;
}

.article-pane h4 {
  color: var(--navy);
  font-size: 16px;
  margin-bottom: 8px;
}

.library-overview-card {
  padding: 30px 32px;
}

.library-summary {
  max-width: 820px;
  color: var(--text2);
  font-size: 15px;
}

.library-card-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px;
  margin-top: 24px;
}

.library-card-item {
  border-radius: 20px;
  border: 1px solid rgba(47, 120, 173, 0.12);
  background: linear-gradient(180deg, #ffffff 0%, #f8fbff 100%);
  box-shadow: 0 14px 30px rgba(20, 63, 116, 0.08);
  padding: 22px 22px 20px;
}

.library-card-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: 14px;
}

.library-card-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: rgba(47, 120, 173, 0.08);
  color: var(--blue);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
}

.library-card-tag {
  display: inline-flex;
  align-items: center;
  border-radius: 999px;
  padding: 6px 10px;
  background: rgba(110, 176, 194, 0.14);
  color: var(--blue);
  border: 1px solid rgba(47, 120, 173, 0.12);
  font-size: 12px;
  font-weight: 700;
}

.library-card-title {
  display: inline-block;
  color: var(--navy);
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.4;
  text-decoration: none;
}

.library-card-title:hover {
  color: var(--blue);
}

.library-card-desc {
  margin-top: 12px;
  color: var(--text2);
  font-size: 14px;
  line-height: 1.85;
}

.library-card-footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  margin-top: 18px;
}

.library-card-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  border-radius: 999px;
  padding: 10px 14px;
  background: linear-gradient(135deg, var(--blue), var(--cyan));
  color: #fff;
  font-size: 13px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: 0 10px 22px rgba(47, 120, 173, 0.2);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.library-card-link:hover {
  transform: translateY(-1px);
  box-shadow: 0 14px 26px rgba(47, 120, 173, 0.24);
}

.library-list {
  display: grid;
  gap: 0;
}

.library-list-item {
  padding: 20px 0;
  border-bottom: 1px solid rgba(47, 120, 173, 0.12);
}

.library-list-item:first-child {
  padding-top: 4px;
}

.library-list-item:last-child {
  padding-bottom: 0;
  border-bottom: none;
}

.library-list-title {
  display: inline-block;
  color: var(--navy);
  font-family: var(--font-display);
  font-size: 24px;
  line-height: 1.4;
  text-decoration: none;
  margin-bottom: 10px;
}

.library-list-title:hover {
  color: var(--blue);
}

.library-list-desc {
  max-width: 860px;
  color: var(--text2);
  font-size: 15px;
  line-height: 1.9;
}

.article-pane p,
.article-pane li {
  font-size: 13px;
}

.toc-card {
  position: sticky;
  top: calc(var(--compliance-h) + var(--nav-h) + 24px);
  padding: 20px;
}

.toc-title {
  color: var(--navy);
  font-size: 16px;
  font-weight: 900;
  margin-bottom: 12px;
}

.toc-link {
  display: block;
  padding: 10px 12px;
  border-radius: 12px;
  color: var(--text2);
  text-decoration: none;
  font-size: 13px;
  font-weight: 600;
}

.toc-link:hover {
  background: rgba(47, 120, 173, 0.08);
  color: var(--blue);
}


@media (max-width: 1100px) {
  .article-layout { grid-template-columns: 1fr; }
  .toc-card { position: static; }
}

@media (max-width: 900px) {
  .metric-grid,
  .article-split,
  .library-card-grid { grid-template-columns: 1fr; }
}

@media (max-width: 768px) {
  .article-hero-inner,
  .article-shell { padding-left: 16px; padding-right: 16px; }
  .article-title { font-size: 30px; }
  .article-card { padding: 22px 18px; }
  .library-overview-card { padding: 24px 18px; }
  .library-card-title { font-size: 21px; }
  .library-list-title { font-size: 21px; }
  .library-list-item { padding: 18px 0; }
}