.page-about {
  --about-glow-a: radial-gradient(56% 68% at 16% 4%, rgba(43, 110, 143, 0.44), transparent 68%);
  --about-glow-b: radial-gradient(44% 60% at 88% 0%, rgba(255, 107, 44, 0.16), transparent 72%);
  --about-axis: rgba(63, 224, 208, 0.32);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  isolation: isolate;
  padding: 34px 0 0;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  inset: -150px -6vw auto -6vw;
  height: 660px;
  background-image: var(--about-glow-a), var(--about-glow-b);
  pointer-events: none;
}

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

.page-about .about-hero__title {
  margin: 18px 0 0;
  max-width: 15em;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.05rem, 6vw, 4.85rem);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--mist);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
  margin-top: 32px;
}

.page-about .about-hero__lead .lede {
  margin: 0;
  max-width: 40em;
  color: var(--text-body);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

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

.page-about .about-hero__fact {
  padding: 18px 18px 16px;
  background: var(--ink-2);
}

.page-about .about-hero__fact-label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .about-hero__fact-value {
  margin: 8px 0 0;
  font-size: 23px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--white);
}

.page-about .about-hero__media {
  margin-top: 46px;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1400 / 788;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

/* ---------- 通用小节头部 ---------- */

.page-about .about-head {
  max-width: 46em;
  margin-bottom: 34px;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
}

.page-about h2 {
  margin: 12px 0 0;
  font-weight: 900;
  font-size: clamp(1.62rem, 3.2vw, 2.7rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  max-width: 38em;
  color: var(--text-soft);
}

/* ---------- 出发点 ---------- */

.page-about .about-why__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-why__main p {
  margin: 18px 0 0;
  max-width: 40em;
  color: var(--text-body);
}

.page-about .about-why__aside {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about .about-note {
  padding: 20px 20px 18px;
}

.page-about .about-note__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .about-note__list {
  display: grid;
  gap: 10px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-note__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about .about-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--grey);
}

.page-about .about-note__text {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--text-soft);
}

/* ---------- 生产流程 ---------- */

.page-about .about-flow-media {
  margin: 0 0 34px;
}

.page-about .about-flow-media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 675;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

.page-about .about-flow {
  display: grid;
  gap: 18px;
}

.page-about .about-step {
  position: relative;
  padding: 26px 22px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: border-color var(--ease), background-color var(--ease);
}

.page-about .about-step:hover,
.page-about .about-step:focus-within {
  border-color: rgba(63, 224, 208, 0.45);
  background: var(--ink-2);
}

.page-about .about-step__num {
  display: inline-block;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .about-step__title {
  margin: 10px 0 0;
  font-size: 20px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--mist);
}

.page-about .about-step__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.76;
  color: var(--text-soft);
}

.page-about .about-step__roles {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 18px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 团队分工 ---------- */

.page-about .about-roles {
  display: grid;
  gap: 16px;
}

.page-about .about-role {
  padding: 24px 20px 22px;
  background: var(--tint);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: background-color var(--ease), border-color var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-within {
  background: var(--tint-strong);
  border-color: var(--line-strong);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  gap: 6px;
  margin: 0;
}

.page-about .about-role__count {
  font-size: 40px;
  font-weight: 700;
  line-height: 1;
  color: var(--white);
}

.page-about .about-role__unit {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--grey);
}

.page-about .about-role__name {
  margin: 14px 0 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-role__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--text-soft);
}

/* ---------- 发展历程 ---------- */

.page-about .about-history {
  background: linear-gradient(180deg, rgba(30, 78, 107, 0.26), rgba(10, 27, 42, 0) 62%);
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-timeline {
  overflow-x: auto;
  padding-bottom: 10px;
  scrollbar-color: var(--grey) transparent;
  scrollbar-width: thin;
}

.page-about .about-timeline__track {
  position: relative;
  min-width: 880px;
}

.page-about .about-timeline__axis {
  position: absolute;
  top: 31px;
  left: 0;
  display: block;
  width: 100%;
  height: 2px;
  overflow: visible;
}

.page-about .about-timeline__axis line {
  stroke: var(--cyan);
  stroke-opacity: 0.32;
  stroke-width: 2;
}

.page-about .about-timeline__list {
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 20px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__node {
  position: relative;
  padding-top: 56px;
  padding-right: 12px;
}

.page-about .about-timeline__node::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(63, 224, 208, 0.1);
  transition: box-shadow var(--ease), background-color var(--ease);
}

.page-about .about-timeline__node:hover::before {
  background: var(--cyan);
  box-shadow: 0 0 0 7px rgba(63, 224, 208, 0.16);
}

.page-about .about-timeline__stage {
  display: block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--signal);
}

.page-about .about-timeline__title {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--mist);
}

.page-about .about-timeline__text {
  margin: 10px 0 0;
  max-width: 22em;
  font-size: 13.5px;
  line-height: 1.74;
  color: var(--grey);
}

.page-about .about-history__media {
  margin-top: 44px;
}

.page-about .about-history__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1600 / 600;
  object-fit: cover;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  opacity: 0.92;
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners__grid {
  display: grid;
  gap: 38px;
}

.page-about .about-partners__main p {
  margin: 18px 0 0;
  max-width: 38em;
  color: var(--text-body);
}

.page-about .about-partners__link {
  margin-top: 22px;
}

.page-about .about-inline-link {
  display: inline-block;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 208, 0.42);
  padding-bottom: 3px;
  transition: border-color var(--ease), color var(--ease);
}

.page-about .about-inline-link:hover {
  color: var(--mist);
  border-color: var(--mist);
}

.page-about .about-partner-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-partner-list li {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 18px;
  align-items: baseline;
  padding: 20px 20px;
  background: var(--panel);
}

.page-about .about-partner-list__num {
  font-size: 30px;
  font-weight: 700;
  line-height: 1;
  color: var(--signal);
}

.page-about .about-partner-list__text {
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--text-soft);
}

.page-about .about-partner-list__text strong {
  color: var(--mist);
  font-weight: 700;
}

/* ---------- 衡量标准 ---------- */

.page-about .about-metrics {
  display: grid;
  gap: 16px;
}

.page-about .about-metric {
  padding: 26px 22px 24px;
  background: var(--panel);
  border: 1px solid var(--line);
  border-left: 2px solid var(--cyan);
  border-radius: var(--radius);
  transition: background-color var(--ease);
}

.page-about .about-metric:hover {
  background: var(--ink-2);
}

.page-about .about-metric__value {
  margin: 0;
  font-size: 38px;
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.01em;
  color: var(--white);
}

.page-about .about-metric__unit {
  margin-left: 7px;
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0.06em;
  color: var(--grey);
}

.page-about .about-metric__name {
  margin: 14px 0 0;
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.05em;
  color: var(--cyan);
}

.page-about .about-metric__text {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.76;
  color: var(--text-soft);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  border-top: 1px solid var(--line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0;
  font-weight: 900;
  font-size: clamp(1.5rem, 2.8vw, 2.2rem);
  line-height: 1.2;
  letter-spacing: -0.015em;
  color: var(--mist);
}

.page-about .about-cta__text {
  margin: 16px 0 0;
  max-width: 42em;
  color: var(--text-soft);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */

@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-why__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 72px;
  }

  .page-about .about-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
  }

  .page-about .about-step + .about-step {
    margin-left: 34px;
  }

  .page-about .about-step + .about-step::before {
    content: "";
    position: absolute;
    left: -34px;
    top: 42px;
    width: 34px;
    height: 1px;
    background: var(--line-strong);
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-metrics {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 48px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 520px) {
  .page-about .about-hero__facts {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-partner-list li {
    grid-template-columns: minmax(0, 1fr);
    gap: 10px;
  }

  .page-about .about-timeline__track {
    min-width: 760px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-step,
  .page-about .about-role,
  .page-about .about-metric,
  .page-about .about-timeline__node::before,
  .page-about .about-inline-link {
    transition: none;
  }
}
</main>