.page-about {
  --about-panel: linear-gradient(152deg, #14213d 0%, #223a63 62%, #14213d 100%);
  --about-glow-gold: rgba(242, 178, 51, 0.16);
  --about-glow-leaf: rgba(62, 155, 122, 0.13);
  display: block;
  background:
    radial-gradient(900px 520px at 90% -6%, var(--about-glow-gold), transparent 70%),
    radial-gradient(760px 480px at 2% 6%, var(--about-glow-leaf), transparent 70%);
}

.page-about .visually-plain {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 40px) 0 clamp(32px, 5vw, 60px);
  overflow: hidden;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(24px, 3.5vw, 44px);
  align-items: center;
}

.page-about .about-hero__copy .eyebrow {
  margin-top: 14px;
}

.page-about .about-hero__copy h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 5vw, 54px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--ink);
  max-width: 20ch;
}

.page-about .about-hero__copy .lead {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 46ch;
  color: var(--graphite);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-fact {
  border: 1px solid var(--line);
  border-radius: var(--radius-s);
  padding: 10px 12px;
  background: rgba(251, 250, 246, 0.74);
  transition: transform var(--ease), border-color var(--ease);
}

.page-about .about-fact:hover {
  transform: translateY(-2px);
  border-color: rgba(62, 155, 122, 0.45);
}

.page-about .about-fact--gold {
  border-color: rgba(242, 178, 51, 0.62);
  background: linear-gradient(160deg, var(--gold-soft), rgba(255, 232, 176, 0.32));
}

.page-about .about-fact__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(18px, 2.4vw, 24px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .about-fact__label {
  display: block;
  margin-top: 5px;
  font-size: 12px;
  color: var(--mist);
}

.page-about .about-hero__actions {
  margin-top: clamp(20px, 3vw, 28px);
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-hero__visual {
  position: relative;
  border-radius: var(--radius-l);
  background: var(--about-panel);
  box-shadow: var(--shadow-lift);
  padding: clamp(14px, 3vw, 26px);
  overflow: hidden;
  isolation: isolate;
}

.page-about .about-hero__visual::after {
  content: "";
  position: absolute;
  right: -28%;
  bottom: -46%;
  width: 68%;
  aspect-ratio: 1;
  background: radial-gradient(circle, rgba(62, 155, 122, 0.42), transparent 66%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__art {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  height: auto;
}

/* ---------- 主体分区 ---------- */
.page-about .about-layout {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
}

.page-about .about-rail {
  padding-left: 14px;
  border-left: 2px solid var(--line);
}

.page-about .rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .rail-list__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 10px;
  border: 1px solid transparent;
  border-radius: var(--radius-s);
  color: var(--ink-2);
  font-size: 14px;
  line-height: 1.35;
  text-decoration: none;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.page-about .rail-list__link:hover,
.page-about .rail-list__link:focus-visible {
  background: var(--leaf-soft);
  border-color: rgba(62, 155, 122, 0.34);
  color: var(--ink);
}

.page-about .rail-list__num {
  font-family: var(--font-mono);
  font-size: 11px;
  color: var(--leaf);
}

/* ---------- 章节 ---------- */
.page-about .chapter {
  padding: clamp(26px, 4vw, 44px) 0;
  border-top: 1px solid var(--line);
  scroll-margin-top: 112px;
}

.page-about .chapter:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .chapter__head {
  display: grid;
  gap: 6px;
}

.page-about .chapter__index {
  font-family: var(--font-mono);
  font-size: clamp(32px, 5.5vw, 56px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.04em;
  color: rgba(20, 33, 61, 0.16);
}

.page-about .chapter__title {
  margin: 0;
  font-size: clamp(21px, 3vw, 30px);
  line-height: 1.28;
  font-weight: 800;
  color: var(--ink);
  max-width: 22ch;
}

.page-about .chapter__claim {
  margin: 0;
  font-size: clamp(14px, 1.6vw, 16px);
  line-height: 1.75;
  color: var(--mist);
  max-width: 40ch;
  padding-left: 12px;
  border-left: 3px solid var(--gold);
}

.page-about .chapter__lead {
  margin: clamp(16px, 2.4vw, 22px) 0 0;
  max-width: 62ch;
  color: var(--graphite);
}

/* ---------- 图文块 ---------- */
.page-about .about-figure {
  margin: clamp(18px, 3vw, 26px) 0 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--leaf-soft);
}

.page-about .about-figure figcaption {
  margin-top: 8px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 时间线 ---------- */
.page-about .timeline {
  list-style: none;
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 20px;
  left: 44px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(62, 155, 122, 0.6), rgba(242, 178, 51, 0.78) 58%, rgba(242, 178, 51, 0.12));
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 14px;
  padding-bottom: clamp(14px, 2.2vw, 22px);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 44px;
  top: 9px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  border: 2px solid var(--paper);
  box-shadow: 0 0 0 3px rgba(242, 178, 51, 0.2);
  transform: translateX(-50%);
  z-index: 1;
}

.page-about .timeline__year {
  padding-top: 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.02em;
  text-align: right;
  color: var(--ink-2);
  white-space: nowrap;
}

.page-about .timeline__body {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 13px 15px;
  background: rgba(251, 250, 246, 0.92);
  box-shadow: var(--shadow-soft);
  transition: transform var(--ease), border-color var(--ease);
}

.page-about .timeline__body:hover,
.page-about .timeline__body:focus-within {
  transform: translateY(-2px);
  border-color: rgba(242, 178, 51, 0.6);
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--graphite);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--gap);
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .team-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 16px 15px 18px;
  background: linear-gradient(170deg, rgba(221, 241, 231, 0.55), rgba(251, 250, 246, 0.92) 62%);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-within {
  transform: translateY(-2px);
  border-color: rgba(242, 178, 51, 0.62);
  box-shadow: var(--shadow-lift);
}

.page-about .team-card__role {
  margin: 0;
  font-size: 16px;
  font-weight: 800;
  color: var(--ink);
}

.page-about .team-card__size {
  margin: 4px 0 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--leaf);
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--line-strong);
}

.page-about .team-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .team-card__list li {
  position: relative;
  padding-left: 16px;
  font-size: 14px;
  line-height: 1.68;
  color: var(--graphite);
}

.page-about .team-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 2px;
  background: var(--leaf);
}

/* ---------- 板块体系 ---------- */
.page-about .sector-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 30px);
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .sector-figure {
  margin: 0;
}

.page-about .sector-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-m);
  border: 1px solid var(--line);
  background: var(--leaf-soft);
}

.page-about .sector {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(251, 250, 246, 0.9);
  overflow: hidden;
  transition: border-color var(--ease), box-shadow var(--ease);
}

.page-about .sector + .sector {
  margin-top: 10px;
}

.page-about .sector[open] {
  border-color: rgba(62, 155, 122, 0.45);
  box-shadow: var(--shadow-soft);
}

.page-about .sector__head {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 13px 15px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
  transition: background var(--ease);
}

.page-about .sector__head::-webkit-details-marker {
  display: none;
}

.page-about .sector__head:hover {
  background: var(--leaf-soft);
}

.page-about .sector__head:focus-visible {
  outline: 2px solid var(--gold);
  outline-offset: -3px;
}

.page-about .sector__dot {
  flex: 0 0 auto;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--leaf);
}

.page-about .sector[open] .sector__dot {
  background: var(--gold);
}

.page-about .sector__name {
  flex: 1 1 auto;
}

.page-about .sector__badge {
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 500;
  color: var(--mist);
}

.page-about .sector__chev::before {
  content: "+";
  font-family: var(--font-mono);
  font-size: 16px;
  line-height: 1;
  color: var(--leaf);
}

.page-about .sector[open] .sector__chev::before {
  content: "\2212";
}

.page-about .sector__body {
  padding: 4px 15px 15px;
  border-top: 1px dashed var(--line);
  margin-top: 0;
}

.page-about .sector__intro {
  margin: 10px 0 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .sector__links {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .sector__links li {
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--graphite);
}

.page-about .sector__links b {
  color: var(--ink);
  font-weight: 700;
}

.page-about .sector__links b::after {
  content: " / ";
  color: var(--mist);
  font-weight: 400;
}

/* ---------- 标注字段 ---------- */
.page-about .spec-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  margin-top: clamp(18px, 3vw, 24px);
}

.page-about .spec {
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius-s);
  padding: 12px 14px;
  background: rgba(255, 232, 176, 0.3);
}

.page-about .spec__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.06em;
  color: var(--mist);
}

.page-about .spec__val {
  display: block;
  margin-top: 5px;
  font-size: 14px;
  line-height: 1.6;
  font-weight: 600;
  color: var(--ink);
}

/* ---------- 步骤 ---------- */
.page-about .steps {
  list-style: none;
  margin: clamp(16px, 3vw, 24px) 0 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: rgba(251, 250, 246, 0.92);
}

.page-about .steps__item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--graphite);
}

.page-about .steps__num {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  border-radius: 8px;
  background: var(--orange-soft);
  color: var(--ink);
  font-family: var(--font-mono);
  font-size: 12.5px;
  font-weight: 700;
}

/* ---------- 节奏与服务 ---------- */
.page-about .cadence {
  list-style: none;
  margin: clamp(18px, 3vw, 24px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
}

.page-about .cadence__item {
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  padding: 14px 16px;
  background: rgba(221, 241, 231, 0.42);
  transition: border-color var(--ease), transform var(--ease);
}

.page-about .cadence__item:hover {
  transform: translateY(-2px);
  border-color: rgba(242, 178, 51, 0.58);
}

.page-about .cadence__item strong {
  display: block;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .cadence__item span {
  display: block;
  margin-top: 5px;
  font-size: 13.5px;
  line-height: 1.68;
  color: var(--graphite);
}

.page-about .stat-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: clamp(20px, 3vw, 28px);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: rgba(251, 250, 246, 0.24);
}

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

.page-about .stat-band__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.2vw, 30px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--gold);
}

.page-about .stat-band__label {
  display: block;
  margin-top: 6px;
  font-size: 12.5px;
  color: rgba(251, 250, 246, 0.8);
}

/* ---------- 转化区 ---------- */
.page-about .about-cta {
  margin-top: clamp(24px, 4vw, 42px);
  border-radius: var(--radius-l);
  padding: clamp(22px, 4vw, 38px);
  background: linear-gradient(142deg, rgba(20, 33, 61, 0.98), rgba(34, 58, 99, 0.94));
  color: var(--paper);
  display: grid;
  gap: 18px;
  box-shadow: var(--shadow-lift);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.3;
  font-weight: 800;
  color: var(--paper);
}

.page-about .about-cta__text {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: rgba(251, 250, 246, 0.82);
  max-width: 46ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .sector-list {
    display: grid;
    gap: 10px;
  }

  .page-about .sector + .sector {
    margin-top: 0;
  }
}

@media (min-width: 700px) {
  .page-about .spec-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
  }

  .page-about .sector-layout {
    grid-template-columns: 288px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 1fr);
    align-items: center;
  }

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

  .page-about .timeline::before {
    left: 62px;
  }

  .page-about .timeline__item {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 20px;
  }

  .page-about .timeline__item::before {
    left: 62px;
  }

  .page-about .timeline__year {
    font-size: 13px;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 210px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .rail-list {
    display: grid;
    gap: 4px;
  }

  .page-about .rail-list__link:hover,
  .page-about .rail-list__link:focus-visible {
    transform: translateX(2px);
  }

  .page-about .rail-list__link {
    transition: background var(--ease), color var(--ease), border-color var(--ease), transform var(--ease);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-fact,
  .page-about .timeline__body,
  .page-about .team-card,
  .page-about .cadence__item,
  .page-about .rail-list__link {
    transition: background var(--ease), color var(--ease), border-color var(--ease), box-shadow var(--ease);
  }

  .page-about .about-fact:hover,
  .page-about .timeline__body:hover,
  .page-about .team-card:hover,
  .page-about .cadence__item:hover,
  .page-about .rail-list__link:hover,
  .page-about .rail-list__link:focus-visible {
    transform: none;
  }
}