.page-certification {
  --cert-node-line: color-mix(in srgb, var(--color-primary) 38%, transparent);
  --cert-node-size: calc(var(--space-6) * 1.1);
}

/* ---------- 首屏 ---------- */
.page-certification .cert-hero {
  padding-top: var(--space-3);
  padding-bottom: calc(var(--space-8) + var(--space-2));
}

.page-certification .cert-hero__crumb {
  margin-bottom: var(--space-3);
}

.page-certification .cert-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-certification .cert-hero__panel {
  background: var(--color-primary);
  color: var(--color-primary-ink);
  border-radius: var(--radius-lg);
  padding: calc(var(--space-6) + var(--space-2)) var(--space-4);
  box-shadow: var(--shadow-2);
}

.page-certification .cert-hero__panel .eyebrow {
  color: color-mix(in srgb, var(--color-primary-ink) 76%, transparent);
  margin: 0 0 var(--space-3);
}

.page-certification .cert-hero__title.display-title {
  color: var(--color-primary-ink);
  font-size: var(--text-display);
  line-height: 1.06;
  letter-spacing: var(--tracking-heading);
  margin: 0;
  max-width: 11ch;
}

.page-certification .cert-hero__lede {
  margin: var(--space-4) 0 0;
  font-size: var(--text-lg);
  line-height: var(--leading-body);
  color: color-mix(in srgb, var(--color-primary-ink) 90%, transparent);
  max-width: 46ch;
}

.page-certification .cert-hero__meta {
  margin: var(--space-4) 0 0;
  font-size: var(--text-sm);
  font-style: italic;
  line-height: 1.7;
  color: color-mix(in srgb, var(--color-primary-ink) 74%, transparent);
  padding-left: var(--space-3);
  border-left: calc(var(--border-thin) * 3) solid color-mix(in srgb, var(--color-primary-ink) 42%, transparent);
  max-width: 44ch;
}

.page-certification .cert-hero__side {
  display: grid;
  gap: var(--space-3);
}

.page-certification .cert-hero__media {
  margin: 0;
}

.page-certification .cert-hero__figures {
  list-style: none;
  margin: 0;
  padding: var(--space-4) var(--space-4);
  display: grid;
  gap: var(--space-3);
  background: var(--color-surface-alt);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-1);
}

.page-certification .hero-fig {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.page-certification .hero-fig__value {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-figure);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--color-accent);
}

.page-certification .hero-fig--text .hero-fig__value {
  font-size: var(--text-2xl);
  color: var(--color-primary);
}

.page-certification .hero-fig__unit {
  font-size: var(--text-sm);
  color: var(--color-ink-soft);
}

/* ---------- 旅程线 ---------- */
.page-certification .cert-hero__line {
  margin-top: var(--space-6);
}

.page-certification .journey-line {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: var(--space-2);
  min-width: 520px;
}

.page-certification .journey-line::before {
  content: "";
  position: absolute;
  left: 2%;
  right: 2%;
  top: calc(var(--space-8) * 0.8);
  height: calc(var(--border-thin) * 2);
  transform: translateY(-50%);
  background: var(--cert-node-line);
  border-radius: var(--radius-pill);
}

.page-certification .journey-line__item {
  position: relative;
  height: calc(var(--space-8) * 1.6);
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-certification .journey-line__item--d1 { --cert-node-size: calc(var(--space-8) * 1.02); }
.page-certification .journey-line__item--d2 { --cert-node-size: calc(var(--space-6) * 1.15); }
.page-certification .journey-line__item--d3 { --cert-node-size: calc(var(--space-6) * 0.86); }
.page-certification .journey-line__item--d4 { --cert-node-size: calc(var(--space-6) * 1.22); }
.page-certification .journey-line__item--d5 { --cert-node-size: calc(var(--space-6) * 1); }

.page-certification .journey-line__node {
  position: relative;
  z-index: 1;
  display: grid;
  place-items: center;
  width: var(--cert-node-size);
  height: var(--cert-node-size);
  border-radius: var(--radius-pill);
  background: var(--color-primary-soft);
  color: var(--color-primary);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-sm);
  text-decoration: none;
  box-shadow: var(--shadow-1);
  transition: background-color 240ms cubic-bezier(0.22, 0.61, 0.36, 1),
    color 240ms cubic-bezier(0.22, 0.61, 0.36, 1),
    transform 240ms cubic-bezier(0.22, 0.61, 0.36, 1);
}

.page-certification .journey-line__item--current .journey-line__node {
  background: var(--color-accent);
  color: var(--color-accent-ink);
  transform: scale(1.04);
}

.page-certification .journey-line__node:hover,
.page-certification .journey-line__node:focus-visible {
  background: var(--color-primary);
  color: var(--color-primary-ink);
}

.page-certification .journey-line__node:focus-visible {
  outline: calc(var(--border-thin) * 2) solid var(--color-focus);
  outline-offset: 3px;
}

.page-certification .journey-line__label {
  position: absolute;
  top: calc(50% + var(--space-6));
  left: 50%;
  transform: translateX(-50%);
  white-space: nowrap;
  font-size: var(--text-xs);
  letter-spacing: 0.04em;
  color: var(--color-ink-soft);
}

/* ---------- 旅程正文 ---------- */
.page-certification .cert-body {
  padding-bottom: var(--space-6);
}

.page-certification .leg {
  padding: var(--space-6) 0;
}

.page-certification .leg--tinted {
  background: var(--color-surface-alt);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-4);
  margin-bottom: var(--space-4);
}

.page-certification .leg--edge {
  background: var(--color-primary-soft);
  border-radius: var(--radius-lg);
  padding: var(--space-6) var(--space-4);
  border-left: calc(var(--border-thin) * 5) solid var(--color-primary);
  margin-bottom: var(--space-4);
}

.page-certification .leg--last {
  padding-bottom: var(--space-6);
}

.page-certification .leg__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-3);
}

.page-certification .leg__index {
  margin: 0 0 var(--space-1);
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  letter-spacing: 0.16em;
  color: var(--color-primary);
}

.page-certification .leg__title {
  margin: 0;
  font-size: var(--text-2xl);
  line-height: var(--leading-heading);
  letter-spacing: var(--tracking-heading);
  color: var(--color-ink);
}

.page-certification .leg__lede {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-certification .fact-list {
  margin: var(--space-4) 0 0;
  padding: 0;
}

.page-certification .fact-list__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-1);
  padding: var(--space-3) 0;
  border-top: var(--border-thin) solid var(--color-line);
}

.page-certification .fact-list__row:last-child {
  border-bottom: var(--border-thin) solid var(--color-line);
}

.page-certification .fact-list dt {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: var(--text-xs);
  letter-spacing: 0.1em;
  color: var(--color-primary);
}

.page-certification .fact-list dd {
  margin: 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink);
  max-width: var(--measure);
}

.page-certification .fact-list dd a {
  color: var(--color-accent);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-certification .leg__figure {
  margin: var(--space-4) 0 0;
}

.page-certification .leg__extra {
  margin-top: var(--space-4);
}

.page-certification .accordion {
  display: grid;
  gap: var(--space-2);
}

.page-certification .mini-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: var(--space-2);
}

.page-certification .mini-list li {
  position: relative;
  padding-left: var(--space-3);
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: var(--measure);
}

.page-certification .mini-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: calc(var(--space-2) * 0.85);
  width: calc(var(--border-thin) * 3);
  height: calc(var(--space-2) * 0.85);
  border-radius: var(--radius-pill);
  background: var(--color-accent);
}

.page-certification .mini-list strong {
  display: block;
  font-weight: 600;
  color: var(--color-ink);
}

/* ---------- 收尾 ---------- */
.page-certification .cert-outro {
  display: grid;
  gap: var(--space-3);
  align-items: center;
}

.page-certification .cert-outro__text .section-title {
  margin: 0;
}

.page-certification .cert-outro__sub {
  margin: var(--space-2) 0 0;
  font-size: var(--text-base);
  line-height: var(--leading-body);
  color: var(--color-ink-soft);
  max-width: 56ch;
}

.page-certification .cert-outro .btn {
  justify-self: start;
}

/* ---------- 断点 ---------- */
@media (max-width: 720px) {
  .page-certification .cert-hero__line {
    overflow-x: auto;
    padding-bottom: var(--space-2);
  }
}

@media (min-width: 720px) {
  .page-certification .cert-hero__panel {
    padding: calc(var(--space-8) + var(--space-2)) var(--space-6);
  }

  .page-certification .fact-list__row {
    grid-template-columns: minmax(84px, auto) minmax(0, 1fr);
    gap: var(--space-4);
    align-items: baseline;
  }

  .page-certification .leg--tinted,
  .page-certification .leg--edge {
    padding: var(--space-6) var(--space-6);
  }

  .page-certification .cert-outro {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: var(--space-6);
    padding: var(--space-6);
  }

  .page-certification .cert-outro .btn {
    justify-self: end;
  }
}

@media (min-width: 960px) {
  .page-certification .cert-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: var(--space-4);
    align-items: start;
  }

  .page-certification .cert-hero__side {
    gap: var(--space-4);
  }

  .page-certification .cert-hero__figures {
    padding: var(--space-4) var(--space-6);
  }

  .page-certification .leg__grid {
    grid-template-columns: minmax(0, 3fr) minmax(0, 8fr);
    gap: var(--space-8);
    align-items: start;
  }

  .page-certification .leg__head {
    position: sticky;
    top: calc(var(--space-8) + var(--space-2));
  }

  .page-certification .leg__title {
    font-size: var(--text-3xl);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-certification .journey-line__node {
    transition: none;
  }

  .page-certification .journey-line__item--current .journey-line__node {
    transform: none;
  }
}