.page-about {
  --about-h1: clamp(2.05rem, 1.15rem + 3.6vw, 3.4rem);
  --about-rail-x: 7px;
  --about-gutter: 34px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: 1.5rem 2.25rem;
  background:
    radial-gradient(120% 90% at 88% 0%, rgba(47, 243, 214, 0.1), transparent 58%),
    radial-gradient(90% 70% at 0% 100%, rgba(255, 106, 43, 0.08), transparent 62%);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
  align-items: center;
}

.page-about .about-hero__copy h1 {
  font-size: var(--about-h1);
  line-height: 1.08;
  letter-spacing: -0.02em;
  margin: 0.5rem 0 0.9rem;
}

.page-about .about-hero__copy .lede {
  margin: 0 0 1.5rem;
  max-width: 46ch;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-hero__visual {
  position: relative;
}

.page-about .about-hero__art {
  display: block;
  width: 100%;
  height: auto;
  max-width: 560px;
  margin-inline: auto;
  filter: drop-shadow(0 24px 48px rgba(0, 0, 0, 0.6));
}

/* ---------- 页内导航 ---------- */
.page-about .about-index {
  display: flex;
  gap: 0.5rem;
  overflow-x: auto;
  padding-block: 1.1rem;
  border-bottom: 1px solid var(--line);
  scrollbar-width: thin;
}

.page-about .about-index__link {
  flex: 0 0 auto;
  padding: 0.45rem 0.9rem;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--muted);
  font-size: 0.86rem;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(47, 243, 214, 0.06);
}

/* ---------- 纵向叙事骨架 ---------- */
.page-about .about-ledger {
  position: relative;
  display: grid;
  gap: 3rem;
  padding-block: 2.5rem 3rem;
}

.page-about .about-ledger::before {
  content: "";
  position: absolute;
  left: var(--about-rail-x);
  top: 14px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(
    180deg,
    rgba(47, 243, 214, 0.6),
    rgba(28, 53, 85, 0.5) 42%,
    rgba(255, 106, 43, 0.4)
  );
}

.page-about .about-block {
  position: relative;
  padding-left: var(--about-gutter);
  scroll-margin-top: 96px;
}

.page-about .about-block::before {
  content: "";
  position: absolute;
  left: calc(var(--about-rail-x) - 6px);
  top: 9px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  border: 1px solid var(--cyan);
  background: var(--ink);
  box-shadow: 0 0 0 4px rgba(47, 243, 214, 0.09);
}

.page-about .about-block__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-block__title {
  margin: 0.5rem 0 1.1rem;
  font-size: var(--fs-h2);
  letter-spacing: -0.02em;
  line-height: 1.18;
}

.page-about .about-block__body > p {
  max-width: 68ch;
  margin: 0 0 1rem;
}

.page-about .about-block__body > p:last-child {
  margin-bottom: 0;
}

/* ---------- 团队三栏 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.75rem;
}

.page-about .team-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: linear-gradient(160deg, rgba(14, 31, 56, 0.96), rgba(7, 17, 32, 0.96));
  padding: 1.35rem 1.25rem;
  box-shadow: var(--shadow-1);
  transition: border-color 0.2s var(--ease);
}

.page-about .team-card:hover {
  border-color: var(--cyan);
}

.page-about .team-card__num {
  margin: 0 0 0.85rem;
  font-family: var(--font-mono);
  font-size: 2.1rem;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .team-card__unit {
  margin-left: 0.25em;
  font-family: var(--font-sans);
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--muted);
}

.page-about .team-card__role {
  margin: 0 0 0.5rem;
  font-size: var(--fs-h3);
  letter-spacing: -0.01em;
}

.page-about .team-card__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.72;
  color: var(--muted);
}

.page-about .about-team__media,
.page-about .about-process__figure,
.page-about .about-history__media {
  margin: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid var(--line);
}

.page-about .media-frame__caption {
  margin-top: 0.6rem;
  font-size: 0.8rem;
  color: var(--muted);
}

/* ---------- 四道工序 ---------- */
.page-about .process-grid {
  display: grid;
  gap: 1.75rem;
}

.page-about .process-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: step;
}

.page-about .process-step {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 1rem;
  padding-block: 1.05rem;
  border-bottom: 1px dashed var(--line);
}

.page-about .process-step:first-child {
  padding-top: 0;
}

.page-about .process-step:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .process-step__icon {
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  border: 1px solid var(--line);
  border-radius: 12px;
  color: var(--cyan);
  background: rgba(47, 243, 214, 0.05);
}

.page-about .process-step__title {
  margin: 0 0 0.35rem;
  font-size: 1.05rem;
  letter-spacing: -0.01em;
}

.page-about .process-step__body p {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--muted);
}

/* ---------- 历程时间线 ---------- */
.page-about .about-timeline {
  display: grid;
  gap: 0;
  margin-bottom: 1.75rem;
}

.page-about .about-timeline__item {
  display: grid;
  gap: 0.4rem;
  padding-block: 1rem;
  border-top: 1px solid var(--line);
}

.page-about .about-timeline__item:last-child {
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline__item--now {
  background: linear-gradient(90deg, rgba(255, 106, 43, 0.08), transparent 72%);
}

.page-about .about-timeline__time {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 0.35rem;
  font-size: 1.08rem;
  letter-spacing: -0.01em;
  display: flex;
  align-items: center;
  gap: 0.6rem;
  flex-wrap: wrap;
}

.page-about .about-timeline__desc {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--muted);
  max-width: 64ch;
}

/* ---------- 认可与合作 ---------- */
.page-about .trust-grid {
  display: grid;
  gap: 1rem;
  margin-bottom: 1.5rem;
}

.page-about .trust-card {
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  background: rgba(16, 40, 58, 0.6);
  padding: 1.2rem 1.25rem;
}

.page-about .trust-card__title {
  margin: 0 0 0.85rem;
  font-size: 1.05rem;
  letter-spacing: 0.01em;
}

.page-about .trust-card__list {
  margin: 0;
  padding-left: 1.05rem;
  display: grid;
  gap: 0.55rem;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .trust-card__list li::marker {
  color: var(--green);
}

.page-about .about-origin {
  margin: 0;
  padding: 0.9rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-size: 0.88rem;
  color: var(--muted);
  background: rgba(7, 17, 32, 0.7);
}

.page-about .about-origin a {
  color: var(--cyan);
}

/* ---------- 尾部入口 ---------- */
.page-about .about-cta {
  border-top: 1px solid var(--line);
  padding-block: 2.75rem 3.25rem;
  background: radial-gradient(110% 130% at 12% 0%, rgba(47, 243, 214, 0.09), transparent 60%);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.75rem;
}

.page-about .about-cta__title {
  margin: 0 0 0.6rem;
  font-size: var(--fs-h2);
  letter-spacing: -0.02em;
}

.page-about .about-cta__desc {
  margin: 0;
  max-width: 54ch;
  color: var(--muted);
}

.page-about .about-cta__links {
  display: grid;
  gap: 0.75rem;
}

.page-about .about-cta__link {
  display: grid;
  gap: 0.25rem;
  padding: 1rem 1.15rem;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  text-decoration: none;
  color: var(--text);
  background: rgba(14, 31, 56, 0.7);
  transition: border-color 0.2s var(--ease), background-color 0.2s var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-color: var(--cyan);
  background: rgba(47, 243, 214, 0.07);
}

.page-about .about-cta__link-title {
  font-weight: 600;
  letter-spacing: -0.01em;
}

.page-about .about-cta__link-desc {
  font-size: 0.85rem;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-index {
    flex-wrap: wrap;
    overflow-x: visible;
  }

  .page-about .process-grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 2.25rem;
    align-items: start;
  }

  .page-about .trust-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 1.25rem;
    align-items: baseline;
  }

  .page-about .about-cta__links {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about {
    --about-rail-x: 15px;
    --about-gutter: 72px;
  }

  .page-about .about-hero {
    padding-block: 2.5rem 3rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 3.5rem;
  }

  .page-about .about-hero__art {
    margin-inline: 0 0;
  }

  .page-about .about-ledger {
    gap: 3.75rem;
    padding-block: 3rem 3.5rem;
  }

  .page-about .team-grid {
    grid-template-columns: 2fr 3fr 2fr;
    gap: 1.25rem;
    align-items: start;
  }

  .page-about .team-card:nth-child(2) {
    margin-top: -22px;
    padding-block: 1.6rem;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: 3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .team-card,
  .page-about .about-cta__link {
    transition: none;
  }
}