.t4l-qc-body {
  --qc-bg: #f4f7f8;
  --qc-ink: #14242b;
  --qc-muted: #5d6b73;
  --qc-card: #ffffff;
  --qc-line: #dce6ea;
  --qc-accent: var(--brand-primary, #0f6f78);
  --qc-accent-dark: var(--brand-primary-hover, #0066cc);
  --qc-soft: #e7f3f4;
  --qc-warn: #8a5f00;
  --qc-danger: #9d2f2f;
  --qc-radius-md: var(--brand-radius, 16px);
  --qc-radius-lg: calc(var(--brand-radius, 16px) + 12px);
  --qc-shadow: var(--brand-shadow, 0 18px 50px rgba(20, 36, 43, 0.12));
  --qc-shadow-soft: var(--brand-shadow, 0 12px 30px rgba(20, 36, 43, 0.08));
}

.t4l-qc-body,
.t4l-qc-body * {
  box-sizing: border-box;
}

.t4l-qc-body {
  margin: 0;
  background: radial-gradient(circle at 10% 0%, #e5f3f5 0, transparent 32rem), var(--qc-bg);
  color: var(--qc-ink);
  font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", sans-serif;
  line-height: 1.55;
}

.t4l-qc-body a {
  color: inherit;
}

.t4l-qc-body .qc-page {
  min-height: 100vh;
}

.t4l-qc-body .qc-topbar {
  width: min(var(--brand-max-width, 1180px), calc(100% - 32px));
  margin: 0 auto;
  padding: 20px 0 10px;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
}

/* Top themes menu (integrated, replaces the qc-topbar visual role) */
.t4l-qc-body .qc-top-themes {
  width: min(var(--brand-max-width, 1180px), calc(100% - 32px));
  margin: 12px auto 18px;
  display: flex;
  gap: 12px;
  padding: 8px 6px;
  border-bottom: 1px solid rgba(0, 0, 0, 0.06);
  flex-wrap: wrap;
  overflow-x: visible;
  /* prevent horizontal scrollbar on desktop */
  -webkit-overflow-scrolling: touch;
}

.t4l-qc-body .qc-top-themes .qc-theme-item {
  text-decoration: none;
  color: inherit;
  padding: 8px 12px;
  border-radius: 8px;
  white-space: nowrap;
  flex: 0 0 auto;
}

.t4l-qc-body .qc-top-themes .qc-theme-item.is-active {
  font-weight: 700;
  background: rgba(3, 105, 161, 0.08);
}

/* Ensure anchors inside the themes bar render as pills and override global link styles */
.t4l-qc-body .qc-top-themes a,
.t4l-qc-body .qc-top-themes .qc-theme-item {
  text-decoration: none !important;
  color: inherit !important;
  display: inline-flex;
  align-items: center;
  justify-content: center;
}

.t4l-qc-body .qc-top-themes .qc-theme-item {
  border: 1px solid transparent;
  transition: background .16s ease, border-color .16s ease, transform .12s ease;
}

.t4l-qc-body .qc-top-themes .qc-theme-item:hover {
  transform: translateY(-1px);
  background: rgba(3, 105, 161, 0.04);
}

.t4l-qc-body .qc-top-themes .qc-theme-item.is-active {
  font-weight: 700;
  background: rgba(3, 105, 161, 0.12);
  border-color: rgba(3, 105, 161, 0.12);
}

@media (max-width: 760px) {
  .t4l-qc-body .qc-top-themes {
    overflow-x: auto;
  }
}

/* Slightly increase spacing above hero when themes menu is present */
.t4l-qc-body .qc-top-themes+.qc-hero {
  margin-top: 6px;
}

.t4l-qc-body .qc-brand {
  display: flex;
  align-items: center;
  gap: 12px;
  font-weight: 760;
  letter-spacing: -0.02em;
}

.t4l-qc-body .qc-brand-mark {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border-radius: 14px;
  background: linear-gradient(135deg, var(--qc-accent), #1d9ba4);
  color: #fff;
  box-shadow: var(--qc-shadow-soft);
}

.t4l-qc-body .qc-toplink {
  color: var(--qc-muted);
  font-size: 0.95rem;
  text-decoration: none;
}

.t4l-qc-body .qc-hero {
  width: min(var(--brand-max-width, 1180px), calc(100% - 32px));
  margin: 18px auto 24px;
  display: grid;
  grid-template-columns: minmax(0, 1.2fr) minmax(320px, 0.8fr);
  gap: 22px;
  align-items: stretch;
}

.t4l-qc-body .qc-hero-card,
.t4l-qc-body .qc-proof-card {
  border: 1px solid rgba(15, 111, 120, 0.14);
  background: rgba(255, 255, 255, 0.82);
  backdrop-filter: blur(12px);
  border-radius: var(--qc-radius-lg);
  padding: 34px;
  box-shadow: var(--qc-shadow-soft);
}

.t4l-qc-body .qc-kicker {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  color: var(--qc-accent-dark);
  font-weight: 780;
  font-size: 0.88rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  margin-bottom: 16px;
}

.t4l-qc-body .qc-kicker::before {
  content: "";
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--qc-accent);
}

.t4l-qc-body .qc-hero h1 {
  margin: 0;
  font-size: clamp(2.2rem, 5vw, 4.75rem);
  line-height: 0.96;
  letter-spacing: -0.065em;
}

.t4l-qc-body .qc-hero-subtitle {
  margin: 22px 0 0;
  max-width: 68ch;
  color: var(--qc-muted);
  font-size: clamp(1.02rem, 1.4vw, 1.22rem);
}

.t4l-qc-body .qc-hero-actions {
  margin-top: 26px;
  display: flex;
  gap: 12px;
  flex-wrap: wrap;
}

.t4l-qc-body .qc-btn {
  border: 0;
  border-radius: 999px;
  padding: 12px 18px;
  font-weight: 760;
  cursor: pointer;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 8px;
}

.t4l-qc-body .qc-btn-primary {
  background: var(--qc-accent);
  color: white;
  box-shadow: var(--qc-shadow-soft);
}

.t4l-qc-body .qc-btn-ghost {
  background: var(--qc-soft);
  color: var(--qc-accent-dark);
}

.t4l-qc-body .qc-proof-card {
  display: flex;
  flex-direction: column;
  justify-content: space-between;
  min-height: 290px;
  background: linear-gradient(145deg, rgba(255, 255, 255, 0.94), rgba(231, 243, 244, 0.9));
}

.t4l-qc-body .qc-proof-title {
  font-weight: 820;
  font-size: 1.15rem;
  margin-bottom: 10px;
}

.t4l-qc-body .qc-proof-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.t4l-qc-body .qc-proof-list li {
  display: flex;
  gap: 10px;
  align-items: flex-start;
  color: var(--qc-muted);
}

.t4l-qc-body .qc-proof-list li::before {
  content: "";
  margin-top: .55em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--qc-accent);
  flex: 0 0 auto;
}

.t4l-qc-body .qc-proof-note {
  margin-top: 18px;
  padding-top: 18px;
  border-top: 1px solid var(--qc-line);
  color: var(--qc-accent-dark);
  font-weight: 760;
}

.t4l-qc-body .qc-shell {
  width: min(var(--brand-max-width, 1180px), calc(100% - 32px));
  margin: 0 auto 48px;
  display: grid;
  grid-template-columns: 310px minmax(0, 1fr);
  gap: 22px;
  align-items: start;
}

.t4l-qc-body .qc-sidebar {
  position: sticky;
  top: 14px;
  background: var(--qc-card);
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-lg);
  padding: 16px;
  box-shadow: var(--qc-shadow-soft);
  max-height: calc(100vh - 28px);
  overflow: auto;
}

.t4l-qc-body .qc-sidebar-title {
  padding: 8px 10px 14px;
  border-bottom: 1px solid var(--qc-line);
  margin-bottom: 10px;
}

.t4l-qc-body .qc-sidebar-title strong {
  display: block;
}

.t4l-qc-body .qc-sidebar-title span {
  display: block;
  color: var(--qc-muted);
  font-size: .9rem;
  margin-top: 2px;
}

.t4l-qc-body .qc-nav {
  display: grid;
  gap: 6px;
}

.t4l-qc-body .qc-nav-button {
  width: 100%;
  text-align: left;
  border: 0;
  background: transparent;
  color: var(--qc-ink);
  border-radius: 14px;
  padding: 11px 12px;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 8px;
  cursor: pointer;
  transition: background .18s ease, transform .18s ease;
}

.t4l-qc-body .qc-nav-item {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 11px 12px;
  border-radius: 12px;
  transition: background .14s ease, transform .12s ease;
}

.t4l-qc-body .qc-nav-item:hover {
  background: #f2f7f8;
  transform: translateX(2px);
}

.t4l-qc-body .qc-nav-item:active,
.t4l-qc-body .qc-nav-item.is-active {
  background: var(--qc-soft);
  color: var(--qc-accent-dark);
}

.t4l-qc-body .qc-nav-button:hover {
  background: #f2f7f8;
  transform: translateX(2px);
}

.t4l-qc-body .qc-nav-button.is-active {
  background: var(--qc-soft);
  color: var(--qc-accent-dark);
}

.t4l-qc-body .qc-nav-number {
  width: 26px;
  height: 26px;
  display: grid;
  place-items: center;
  border-radius: 9px;
  background: #eef4f5;
  font-weight: 780;
  font-size: .78rem;
}

.t4l-qc-body .qc-nav-button.is-active .qc-nav-number {
  background: var(--qc-accent);
  color: #fff;
}

.t4l-qc-body .qc-nav-title {
  font-weight: 720;
  font-size: .95rem;
  line-height: 1.25;
}

.t4l-qc-body .qc-stage {
  min-width: 0;
  display: grid;
  gap: 18px;
}

.t4l-qc-body .qc-topic-card {
  background: var(--qc-card);
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-lg);
  padding: clamp(22px, 4vw, 38px);
  box-shadow: var(--qc-shadow);
}

.t4l-qc-body .qc-topic-header {
  display: grid;
  gap: 12px;
  max-width: 840px;
}

.t4l-qc-body .qc-topic-eyebrow {
  color: var(--qc-accent-dark);
  font-weight: 800;
  letter-spacing: .06em;
  text-transform: uppercase;
  font-size: .82rem;
}

.t4l-qc-body .qc-topic-title {
  margin: 0;
  font-size: clamp(1.75rem, 3.2vw, 3.2rem);
  line-height: 1.02;
  letter-spacing: -0.045em;
}

.t4l-qc-body .qc-topic-teaser {
  color: var(--qc-muted);
  font-size: 1.06rem;
  margin: 0;
  max-width: 75ch;
}

.t4l-qc-body .qc-layout {
  margin-top: 28px;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 330px;
  gap: 24px;
  align-items: start;
}

.t4l-qc-body .qc-content-flow {
  display: grid;
  gap: 18px;
}

.t4l-qc-body .qc-topic-figure {
  margin: 0;
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-md);
  overflow: hidden;
  background: #f7fbfb;
}

.t4l-qc-body .qc-info-box {
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-md);
  padding: 20px;
  background: #fbfdfd;
}

.t4l-qc-body .qc-info-box h3,
.t4l-qc-body .qc-visual h3,
.t4l-qc-body .qc-case-area h3 {
  margin: 0 0 12px;
  font-size: 1rem;
  letter-spacing: -0.02em;
}

.t4l-qc-body .qc-benefit {
  font-weight: 720;
  color: var(--qc-accent-dark);
}

.t4l-qc-body .qc-prose p {
  margin: 0 0 14px;
  color: #26373e;
}

.t4l-qc-body .qc-prose p:last-child {
  margin-bottom: 0;
}

.t4l-qc-body .qc-bullet-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.t4l-qc-body .qc-bullet-list li {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  color: #2c3d44;
}

.t4l-qc-body .qc-bullet-list li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: .55em;
  border-radius: 50%;
  background: var(--qc-accent);
}

.t4l-qc-body .qc-pitfalls {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 14px;
}

.t4l-qc-body .qc-pitfall-card {
  border-radius: var(--qc-radius-md);
  padding: 18px;
  background: #fff9ef;
  border: 1px solid #f0dec0;
}

.t4l-qc-body .qc-audit-card {
  border-radius: var(--qc-radius-md);
  padding: 18px;
  background: #eff7f8;
  border: 1px solid #c9e3e6;
}

.t4l-qc-body .qc-pitfall-card h3,
.t4l-qc-body .qc-audit-card h3 {
  margin: 0 0 10px;
  font-size: 1rem;
}

.t4l-qc-body .qc-pitfall-card p,
.t4l-qc-body .qc-audit-card p {
  margin: 0;
  color: #364a51;
}

.t4l-qc-body .qc-visual {
  position: sticky;
  top: 18px;
  background: linear-gradient(180deg, #f7fbfb, #ffffff);
  border: 1px solid var(--qc-line);
  border-radius: 24px;
  padding: 18px;
  box-shadow: var(--qc-shadow-soft);
}

.t4l-qc-body .qc-visual-frame {
  border-radius: 18px;
  background: #f1f7f8;
  min-height: 220px;
  display: grid;
  place-items: center;
  overflow: hidden;
  border: 1px solid #d7e7ea;
}

.t4l-qc-body .qc-visual-image {
  width: 100%;
  height: auto;
  max-width: 100%;
  display: block;
}

.t4l-qc-body .qc-figure-caption {
  margin: 0;
  padding: 10px 14px 12px;
  color: var(--qc-muted);
  font-size: .9rem;
  border-top: 1px solid var(--qc-line);
  background: #fbfdfd;
}

.t4l-qc-body .qc-next-step {
  border-radius: var(--qc-radius-md);
  background: var(--qc-ink);
  color: #fff;
  padding: 18px;
}

.t4l-qc-body .qc-next-step span {
  display: block;
  color: #c9e3e6;
  font-size: .84rem;
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 800;
  margin-bottom: 7px;
}

.t4l-qc-body .qc-sources {
  color: var(--qc-muted);
  font-size: .92rem;
}

.t4l-qc-body .qc-bottom-nav {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  margin-top: 22px;
  border-top: 1px solid var(--qc-line);
  padding-top: 22px;
}

.t4l-qc-body .qc-bottom-nav button {
  min-width: 140px;
}

.t4l-qc-body .qc-case-area {
  background: var(--qc-card);
  border: 1px solid var(--qc-line);
  border-radius: var(--qc-radius-lg);
  padding: clamp(22px, 3vw, 30px);
  box-shadow: var(--qc-shadow-soft);
}

.t4l-qc-body .qc-case-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 14px;
}

.t4l-qc-body .qc-case-figure {
  grid-column: 1 / -1;
  margin: 0;
  border-radius: var(--qc-radius-md);
  overflow: hidden;
  border: 1px solid var(--qc-line);
  background: #f7fbfb;
}

/* ---- Non-QC hub static content improvements (scoped to avoid touching QC pages) ---- */

/* Typography for static hub articles */
.t4l-qc-body .hub-static-content h2 {
  margin: 0 0 0.6rem;
  font-size: clamp(1.6rem, 3.2vw, 2.6rem);
  line-height: 1.02;
  letter-spacing: -0.02em;
  font-weight: 760;
  color: var(--qc-ink, #14242b);
}

.t4l-qc-body .hub-static-content h3 {
  margin: 1.05rem 0 0.5rem;
  font-size: 1.02rem;
  font-weight: 720;
  color: var(--qc-ink, #14242b);
}

.t4l-qc-body .hub-static-content h4 {
  margin: 0.8rem 0 0.4rem;
  font-size: 0.98rem;
  font-weight: 700;
  color: var(--qc-accent-dark, #0066cc);
}

.t4l-qc-body .hub-static-content p {
  margin: 0 0 0.9rem;
  line-height: 1.6;
  color: #26373e;
  max-width: 75ch;
}

/* QC-like bullet lists inside static content */
.t4l-qc-body .hub-static-content ul {
  margin: 0 0 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.t4l-qc-body .hub-static-content ul li {
  display: grid;
  grid-template-columns: 18px minmax(0, 1fr);
  gap: 8px;
  align-items: start;
  color: #2c3d44;
}

.t4l-qc-body .hub-static-content ul li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: .55em;
  border-radius: 50%;
  background: var(--qc-accent, #0f6f78);
  flex: 0 0 auto;
}

.t4l-qc-body .hub-static-content strong {
  color: var(--qc-accent-dark, #0066cc);
  font-weight: 760;
}

/* Under-topic box similar to qc-info-box */
.t4l-qc-body .hub-static-content .hub-topic {
  border: 1px solid var(--qc-line, #dce6ea);
  border-radius: 12px;
  padding: 16px;
  background: #fbfdfd;
  margin: 0 0 12px;
}

.t4l-qc-body .hub-static-content .qc-nav-item,
.t4l-qc-body .hub-static-content .qc-nav a,
.t4l-qc-body .hub-static-content nav a {
  display: block;
  text-decoration: none;
  color: inherit;
  padding: 8px 10px;
  border-radius: 10px;
  transition: background .14s ease, transform .12s ease;
}

.t4l-qc-body .hub-static-content .qc-nav-item:hover,
.t4l-qc-body .hub-static-content .qc-nav a:hover,
.t4l-qc-body .hub-static-content nav a:hover {
  background: #f2f7f8;
  transform: translateX(2px);
}

/* small utility to ensure right-hand cards show inner structure clearly */
.t4l-qc-body .hub-static-content .qc-topic-card,
.t4l-qc-body .hub-static-content .qc-info-box,
.t4l-qc-body .hub-static-content .qc-topic-card.qc-prose {
  box-shadow: var(--qc-shadow-soft, 0 12px 30px rgba(20, 36, 43, 0.08));
}

/* End of non-QC static styling */

.t4l-qc-body .qc-case-card {
  border: 1px solid var(--qc-line);
  border-radius: 20px;
  padding: 18px;
  background: #fbfdfd;
}

/* Visible styles for static hub topic cards and menu buttons */
.t4l-qc-body .hub-topic-card {
  margin-top: 18px;
}

.t4l-qc-body .hub-topic-card .qc-topic-header {
  border-bottom: 1px solid var(--qc-line, #e6eff0);
  padding-bottom: 12px;
  margin-bottom: 14px;
}

.t4l-qc-body .hub-topic-card .qc-topic-eyebrow {
  font-size: 0.85rem;
  color: var(--qc-muted, #6b7d83);
  text-transform: uppercase;
  letter-spacing: .08em;
  font-weight: 800;
}

.t4l-qc-body .hub-topic-card .qc-topic-title {
  margin: 6px 0 0;
  font-size: 1.12rem;
  color: var(--qc-ink, #14242b);
  font-weight: 760;
}

.t4l-qc-body .hub-topic-card .qc-info-box {
  border: 1px solid var(--qc-line, #e6eff0);
  background: #fbfdfd;
  padding: 14px;
  margin: 12px 0;
  border-radius: 10px;
}

.t4l-qc-body .qc-nav .qc-nav-item {
  display: block;
  background: transparent;
  border: 1px solid transparent;
  padding: 10px 12px;
  border-radius: 10px;
  color: var(--qc-ink, #14242b);
  margin-bottom: 8px;
}

.t4l-qc-body .qc-nav .qc-nav-item:hover {
  background: #f2f7f8;
  transform: translateX(4px);
}

.t4l-qc-body .qc-nav .qc-nav-item.is-active {
  background: var(--qc-accent, #0f6f78);
  color: #fff;
  border-color: rgba(0,0,0,0.04);
}


.t4l-qc-body .qc-case-card strong {
  display: block;
  margin-bottom: 8px;
}

.t4l-qc-body .qc-case-card p {
  margin: 0 0 10px;
  color: var(--qc-muted);
}

.t4l-qc-body .qc-case-card small {
  color: var(--qc-accent-dark);
  font-weight: 760;
}

.t4l-qc-body .qc-footer {
  width: min(var(--brand-max-width, 1180px), calc(100% - 32px));
  margin: 0 auto 40px;
  color: var(--qc-muted);
  font-size: .92rem;
}

.t4l-qc-body .qc-no-js {
  width: min(var(--brand-max-width, 1180px), calc(100% - 32px));
  margin: 20px auto;
  padding: 16px;
  background: #fff4e2;
  border: 1px solid #efd59c;
  border-radius: 16px;
}

@media (max-width: 980px) {

  .t4l-qc-body .qc-hero,
  .t4l-qc-body .qc-shell,
  .t4l-qc-body .qc-layout {
    grid-template-columns: 1fr;
  }

  .t4l-qc-body .qc-sidebar,
  .t4l-qc-body .qc-visual {
    position: static;
    max-height: none;
  }

  .t4l-qc-body .qc-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .t4l-qc-body .qc-case-grid {
    grid-template-columns: 1fr;
  }
}

@media (max-width: 640px) {
  .t4l-qc-body .qc-topbar {
    align-items: flex-start;
    flex-direction: column;
  }

  .t4l-qc-body .qc-hero-card,
  .t4l-qc-body .qc-proof-card,
  .t4l-qc-body .qc-topic-card {
    padding: 22px;
  }

  .t4l-qc-body .qc-nav {
    grid-template-columns: 1fr;
  }

  .t4l-qc-body .qc-pitfalls {
    grid-template-columns: 1fr;
  }

  .t4l-qc-body .qc-bottom-nav {
    flex-direction: column;
  }

  .t4l-qc-body .qc-btn {
    width: 100%;
  }
}