.page-about .breadcrumb {
  padding: calc(var(--nav-h) + 18px) 0 14px;
}

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(28px, 5vw, 56px) 0 clamp(40px, 6vw, 76px);
  background: linear-gradient(155deg, var(--blue) 0%, var(--blue-deep) 82%);
  color: var(--white);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -18%;
  bottom: -46%;
  width: min(70vw, 720px);
  aspect-ratio: 1;
  background: radial-gradient(circle at 40% 40%, rgba(199, 244, 100, 0.16), transparent 64%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -24%;
  right: -14%;
  width: min(44vw, 460px);
  height: 152%;
  background: linear-gradient(180deg, rgba(215, 38, 61, 0.55), rgba(215, 38, 61, 0.02));
  transform: rotate(15deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(16px, 2.6vw, 26px);
}

.page-about .about-hero__eyebrow {
  color: var(--lime);
  letter-spacing: 0.2em;
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(2.1rem, 7.4vw, 4.5rem);
  line-height: 1.06;
  font-weight: 900;
  letter-spacing: -0.025em;
  max-width: 18ch;
}

.page-about .about-hero__mark {
  color: var(--lime);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 58ch;
  font-size: clamp(1rem, 2vw, 1.125rem);
  color: rgba(255, 255, 255, 0.85);
}

.page-about .about-figures {
  list-style: none;
  margin: clamp(14px, 3vw, 30px) 0 0;
  padding: clamp(20px, 3vw, 30px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 14px;
  border-top: 1px solid var(--glass-white);
}

.page-about .about-figures__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.4vw, 2.35rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  letter-spacing: -0.02em;
}

.page-about .about-figures__label {
  display: block;
  margin-top: 8px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.7);
}

/* ---------- 章节骨架 ---------- */

.page-about .about-section {
  padding: clamp(44px, 7vw, 92px) 0;
}

.page-about .about-section--mist {
  background: var(--mist);
}

.page-about .about-section--deep {
  background: var(--blue-deep);
  color: var(--white);
}

.page-about .about-section--blue {
  background: var(--blue);
  color: var(--white);
}

.page-about .about-section__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-section__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--steel);
}

.page-about .about-section__num {
  font-size: 1.9rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--red);
}

.page-about .about-section--deep .about-section__rail,
.page-about .about-section--blue .about-section__rail {
  color: rgba(255, 255, 255, 0.55);
}

.page-about .about-section--deep .about-section__num,
.page-about .about-section--blue .about-section__num {
  color: var(--lime);
}

.page-about .about-section__body {
  min-width: 0;
}

.page-about .about-section__body .section-title {
  margin: 0 0 16px;
  font-size: clamp(1.55rem, 4.2vw, 2.45rem);
  line-height: 1.2;
  font-weight: 800;
  letter-spacing: -0.015em;
  max-width: 22ch;
}

.page-about .about-section__body .prose {
  max-width: 66ch;
}

.page-about .about-section--deep .about-section__body .prose,
.page-about .about-section--blue .about-section__body .prose {
  color: rgba(255, 255, 255, 0.82);
}

/* ---------- 三项服务支柱 ---------- */

.page-about .about-pillars {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .about-pillars__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  background: var(--white);
  border-radius: var(--r-md);
  border-top: 3px solid var(--red);
  box-shadow: var(--shadow-1);
}

.page-about .about-pillars__no {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--red);
}

.page-about .about-pillars__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-pillars__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 版本时间线 ---------- */

.page-about .about-journey__figure {
  margin: clamp(24px, 4vw, 38px) 0 0;
}

.page-about .about-timeline {
  --tl-pad: 20px;
  margin-top: clamp(28px, 4vw, 44px);
  padding-left: var(--tl-pad);
  border-left: 2px solid rgba(27, 58, 107, 0.14);
}

.page-about .about-timeline .accordion__item {
  position: relative;
  padding-bottom: 12px;
}

.page-about .about-timeline .accordion__item::before {
  content: "";
  position: absolute;
  top: 14px;
  left: calc(-1 * var(--tl-pad) - 6px);
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 4px rgba(215, 38, 61, 0.14);
}

.page-about .about-timeline .accordion__trigger {
  display: flex;
  align-items: center;
  gap: 12px;
  width: 100%;
  padding: 10px 0;
  text-align: left;
}

.page-about .about-timeline .accordion__no {
  flex: 0 0 auto;
  min-width: 4.2em;
  text-align: center;
}

.page-about .about-timeline__head {
  flex: 1 1 auto;
  min-width: 0;
  font-size: 1rem;
  font-weight: 700;
  line-height: 1.45;
  color: var(--blue);
}

.page-about .about-timeline .accordion__body {
  padding-bottom: 6px;
}

.page-about .about-timeline .accordion__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--steel);
}

/* ---------- 团队 ---------- */

.page-about .about-teams {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: clamp(24px, 4vw, 36px);
}

.page-about .about-teams__item {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  border-radius: var(--r-md);
  background: var(--glass-white);
  border: 1px solid rgba(255, 255, 255, 0.18);
  -webkit-backdrop-filter: blur(8px);
  backdrop-filter: blur(8px);
}

.page-about .about-teams__title {
  margin: 0;
  font-size: 1.0625rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-teams__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.76);
}

.page-about .about-team__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

/* ---------- 巡检标准 ---------- */

.page-about .about-pulse {
  display: block;
  width: 100%;
  height: auto;
  max-height: 80px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  color: var(--red);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: clamp(20px, 3vw, 30px);
}

.page-about .about-metrics__item {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 20px 18px;
  background: var(--white);
  border-radius: var(--r-sm);
  border-left: 3px solid var(--red);
  box-shadow: var(--shadow-1);
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 5vw, 2rem);
  font-weight: 700;
  line-height: 1.05;
  letter-spacing: -0.02em;
  color: var(--blue);
}

.page-about .about-metrics__unit {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  color: var(--red);
}

.page-about .about-metrics__label {
  margin-top: 6px;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 兼容生态 ---------- */

.page-about .about-eco__figure {
  margin: clamp(24px, 4vw, 38px) 0 0;
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .about-eco__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 14px;
  background: var(--white);
  border-radius: var(--r-sm);
  box-shadow: var(--shadow-1);
}

.page-about .about-eco__num {
  font-family: var(--font-mono);
  font-size: clamp(1.35rem, 4.5vw, 1.85rem);
  font-weight: 700;
  line-height: 1;
  color: var(--red);
}

.page-about .about-eco__label {
  font-size: 0.78125rem;
  line-height: 1.5;
  color: var(--steel);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3.5vw, 32px);
}

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .about-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

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

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

  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 920px) {
  .page-about .about-section__grid {
    grid-template-columns: 124px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .about-section__rail {
    position: sticky;
    top: calc(var(--nav-h) + 28px);
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }

  .page-about .about-section__num {
    font-size: 2.4rem;
  }

  .page-about .about-section__label {
    font-size: 0.6875rem;
    letter-spacing: 0.2em;
  }

  .page-about .about-timeline {
    --tl-pad: 34px;
  }

  .page-about .about-timeline .accordion__trigger {
    padding: 14px 0;
  }

  .page-about .about-timeline__head {
    font-size: 1.125rem;
  }
}

@media (min-width: 1100px) {
  .page-about .about-section__grid {
    grid-template-columns: 140px minmax(0, 1fr);
  }

  .page-about .about-hero__title {
    max-width: 20ch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-hero::after,
  .page-about .about-hero::before {
    transform: none;
  }
}