.feature-detail-page {
  background:
    linear-gradient(180deg, var(--green-50) 0, rgba(238, 250, 247, 0) 420px),
    var(--page);
}

.feature-detail-main {
  overflow: hidden;
}

.feature-breadcrumb {
  padding-top: var(--space-5);
  font-size: var(--step--1);
  color: var(--ink-600);
}

.feature-breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: none;
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-breadcrumb li {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.feature-breadcrumb li:not(:last-child)::after {
  content: '/';
  color: var(--ink-400);
}

.feature-breadcrumb a {
  color: var(--ink-600);
  text-decoration: none;
}

.feature-breadcrumb a:hover,
.feature-breadcrumb a:focus-visible {
  color: var(--green-700);
  text-decoration: underline;
}

.feature-hero {
  padding: var(--space-7) 0 var(--space-8);
}

.feature-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(280px, .65fr);
  align-items: center;
  gap: clamp(36px, 7vw, 88px);
}

.feature-hero-copy {
  max-width: 720px;
}

.feature-hero-copy h1 {
  max-width: 15ch;
}

.feature-hero-copy .lede {
  margin-top: var(--space-5);
  max-width: 58ch;
}

.feature-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-3);
  margin-top: var(--space-6);
}

.feature-proof {
  position: relative;
  padding: var(--space-5);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .92);
  box-shadow: 0 18px 48px rgba(16, 35, 31, .08);
}

.feature-proof::before {
  content: '';
  position: absolute;
  inset: -1px auto -1px -1px;
  width: 4px;
  border-radius: var(--radius-lg) 0 0 var(--radius-lg);
  background: var(--green-500);
}

.feature-proof-title {
  margin-bottom: var(--space-4);
  font-size: var(--step-1);
  font-weight: 640;
  color: var(--ink-900);
}

.feature-proof-list {
  display: grid;
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
}

.feature-proof-list li {
  display: grid;
  grid-template-columns: 30px 1fr;
  align-items: center;
  gap: var(--space-3);
  margin: 0;
  padding: var(--space-3);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--surface);
  color: var(--ink-700);
}

.feature-proof-list strong {
  display: block;
  font-size: var(--step--1);
}

.feature-step-number {
  display: grid;
  width: 30px;
  height: 30px;
  place-items: center;
  border-radius: 50%;
  background: var(--green-50);
  color: var(--green-700);
  font-size: .76rem;
  font-weight: 680;
}

.feature-content-section {
  padding: var(--space-8) 0;
}

.feature-content-section + .feature-content-section {
  border-top: 1px solid var(--line);
}

.feature-section-heading {
  max-width: 760px;
  margin-bottom: var(--space-6);
}

.feature-section-heading h2 {
  max-width: 19ch;
}

.feature-section-heading p {
  margin-top: var(--space-3);
  color: var(--ink-600);
}

@media (min-width: 1200px) {
  .feature-breadcrumb ol,
  .feature-breadcrumb li { gap: 10px; }
  .feature-hero-grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(350px, .65fr);
    gap: clamp(45px, 7vw, 110px);
  }
  .feature-hero-copy { max-width: 900px; }
  .feature-proof::before { width: 5px; }
  .feature-proof-list li { grid-template-columns: 38px 1fr; }
  .feature-step-number { width: 38px; height: 38px; }
  .feature-section-heading { max-width: 950px; }
}

.feature-process-grid,
.feature-evidence-grid,
.feature-related-grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: var(--space-4);
}

.feature-process-card,
.feature-evidence-card,
.feature-related-card {
  min-width: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.feature-process-card,
.feature-evidence-card {
  padding: var(--space-5);
}

.feature-process-card h3,
.feature-evidence-card h3 {
  margin-bottom: var(--space-3);
  font-size: var(--step-1);
}

.feature-process-card p,
.feature-evidence-card p {
  margin: 0;
  color: var(--ink-600);
}

.feature-split {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: var(--space-5);
}

.feature-split-panel {
  padding: var(--space-6);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
}

.feature-split-panel.is-accent {
  border-color: var(--green-100);
  background: var(--green-50);
}

.feature-split-panel h2,
.feature-split-panel h3 {
  margin-bottom: var(--space-3);
  font-size: var(--step-2);
}

.feature-split-panel p:last-child,
.feature-split-panel ul:last-child {
  margin-bottom: 0;
}

.feature-check-list {
  margin: var(--space-4) 0 0;
  padding: 0;
  list-style: none;
}

.feature-check-list li {
  position: relative;
  margin: 0;
  padding: 10px 0 10px 30px;
  border-top: 1px solid rgba(10, 107, 92, .12);
}

.feature-check-list li::before {
  content: '✓';
  position: absolute;
  left: 2px;
  color: var(--green-700);
  font-weight: 700;
}

.feature-timeline {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: var(--space-3);
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: feature-timeline;
}

.feature-timeline li {
  position: relative;
  min-width: 0;
  margin: 0;
  padding: var(--space-5);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--surface);
  counter-increment: feature-timeline;
}

.feature-timeline li::before {
  content: counter(feature-timeline, decimal-leading-zero);
  display: block;
  margin-bottom: var(--space-4);
  color: var(--green-700);
  font-size: var(--step--1);
  font-weight: 680;
}

.feature-timeline strong {
  display: block;
  margin-bottom: var(--space-2);
}

.feature-timeline span {
  display: block;
  color: var(--ink-600);
  font-size: var(--step--1);
}

.feature-boundary {
  display: grid;
  grid-template-columns: minmax(0, .7fr) minmax(0, 1.3fr);
  gap: var(--space-6);
  align-items: start;
  padding: clamp(24px, 4vw, 48px);
  border: 1px solid var(--green-100);
  border-radius: var(--radius-lg);
  background: var(--green-50);
}

.feature-boundary h2 {
  font-size: var(--step-2);
}

.feature-boundary p:last-child,
.feature-boundary ul:last-child {
  margin-bottom: 0;
}

.feature-related {
  padding: var(--space-8) 0;
  background: var(--surface-sunken);
  border-block: 1px solid var(--line);
}

.feature-related h2 {
  margin-bottom: var(--space-5);
  font-size: var(--step-2);
}

.feature-related-card {
  display: flex;
  min-height: 124px;
  flex-direction: column;
  justify-content: space-between;
  gap: var(--space-4);
  padding: var(--space-5);
  color: var(--ink-800);
  text-decoration: none;
  transition: border-color .15s ease, background-color .15s ease, color .15s ease;
}

.feature-related-card:hover,
.feature-related-card:focus-visible {
  border-color: var(--green-500);
  background: var(--green-50);
  color: var(--ink-900);
}

.feature-related-card strong {
  font-size: var(--step-1);
}

.feature-related-card span {
  color: var(--green-700);
  font-size: var(--step--1);
  font-weight: 620;
}

.feature-final {
  padding: var(--space-8) 0;
}

.feature-final-panel {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-6);
  padding: clamp(28px, 5vw, 52px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: var(--ink-900);
  color: #fff;
}

.feature-final-panel h2 {
  margin-bottom: var(--space-3);
  color: #fff;
  font-size: var(--step-2);
}

.feature-final-panel p {
  margin: 0;
  color: var(--ink-200);
}

.feature-final-panel .btn {
  flex: 0 0 auto;
  border-color: #fff;
  background: #fff;
  color: var(--ink-900);
}

.feature-final-panel .btn:hover,
.feature-final-panel .btn:focus-visible {
  border-color: var(--green-100);
  background: var(--green-100);
  color: var(--ink-900);
}

.feature-hub-hero {
  padding: var(--space-8) 0 var(--space-7);
}

.feature-hub-hero h1 {
  max-width: 16ch;
}

.feature-hub-hero .lede {
  margin-top: var(--space-4);
  max-width: 62ch;
}

.feature-hub-list {
  display: grid;
  border-top: 1px solid var(--line-strong);
}

.feature-hub-link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: var(--space-5);
  min-height: 142px;
  padding: var(--space-5) 0;
  border-bottom: 1px solid var(--line-strong);
  color: var(--ink-800);
  text-decoration: none;
  transition: color .15s ease, border-color .15s ease, background-color .15s ease;
}

.feature-hub-link:hover,
.feature-hub-link:focus-visible {
  color: var(--ink-900);
  border-color: var(--green-500);
  background: linear-gradient(90deg, rgba(238, 250, 247, .7), transparent 78%);
}

.feature-hub-link h2 {
  margin-bottom: var(--space-2);
  font-size: var(--step-2);
}

.feature-hub-link p {
  margin: 0;
  color: var(--ink-600);
}

.feature-hub-arrow {
  display: grid;
  width: 44px;
  height: 44px;
  place-items: center;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  color: var(--green-700);
  font-size: 1.1rem;
}

.feature-secondary-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--line);
}

.feature-secondary-item {
  min-width: 0;
  padding: var(--space-5);
  background: var(--surface);
}

.feature-secondary-item h3 {
  margin-bottom: var(--space-2);
  font-size: var(--step-1);
}

.feature-secondary-item p {
  margin: 0;
  color: var(--ink-600);
}

@media (max-width: 860px) {
  .feature-hero-grid,
  .feature-boundary {
    grid-template-columns: 1fr;
  }

  .feature-hero-grid {
    gap: var(--space-6);
  }

  .feature-proof {
    max-width: 620px;
  }

  .feature-process-grid,
  .feature-evidence-grid,
  .feature-related-grid,
  .feature-secondary-grid {
    grid-template-columns: 1fr;
  }

  .feature-timeline {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 620px) {
  .feature-breadcrumb {
    padding-top: var(--space-4);
  }

  .feature-hero {
    padding: var(--space-6) 0 var(--space-7);
  }

  .feature-content-section,
  .feature-related,
  .feature-final {
    padding: var(--space-7) 0;
  }

  .feature-split,
  .feature-timeline {
    grid-template-columns: 1fr;
  }

  .feature-split-panel,
  .feature-proof,
  .feature-process-card,
  .feature-evidence-card,
  .feature-timeline li {
    padding: var(--space-4);
  }

  .feature-final-panel {
    align-items: stretch;
    flex-direction: column;
  }

  .feature-final-panel .btn {
    width: 100%;
  }

  .feature-hub-hero {
    padding: var(--space-7) 0 var(--space-6);
  }

  .feature-hub-link {
    grid-template-columns: minmax(0, 1fr) 44px;
    gap: var(--space-3);
    min-height: 128px;
  }

  .feature-hub-link h2 {
    font-size: var(--step-1);
  }
}

@media (prefers-reduced-motion: reduce) {
  .feature-related-card,
  .feature-final-panel .btn,
  .feature-hub-link {
    transition: none;
  }
}