.page-about {
  --about-panel-bg: rgba(7, 18, 39, .72);
  --about-rail-line: #2C4457;
  background: linear-gradient(180deg, var(--navy) 0%, var(--navy) 58%, var(--navy-deep) 100%);
  color: var(--text);
  overflow-x: hidden;
}

.page-about .breadcrumbs {
  padding-block: clamp(14px, 2.4vw, 26px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  padding-block: clamp(8px, 2vw, 20px) clamp(40px, 7vw, 84px);
  align-items: end;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 200;
  font-size: var(--fs-6);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
  max-width: 20ch;
}

.page-about .about-hero__text {
  max-width: 34em;
  margin: 0;
}

.page-about .about-hero__tags {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-panel {
  padding: clamp(20px, 3vw, 32px);
}

.page-about .about-panel__title {
  margin: 0 0 14px;
  color: var(--accent);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-facts__item {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 14px 0;
  border-top: 1px solid var(--about-rail-line);
}

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

.page-about .about-facts__num {
  font-size: var(--fs-5);
  color: var(--accent);
  min-width: 5.5ch;
  line-height: 1;
}

.page-about .about-facts__label {
  font-size: var(--fs-2);
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 4vw, 44px);
  padding-block: clamp(44px, 6vw, 84px);
  border-top: 2px solid var(--about-rail-line);
}

/* ---------- 团队构成 ---------- */
.page-about .about-team {
  display: flex;
  flex-direction: column;
  gap: clamp(20px, 3vw, 32px);
}

.page-about .about-team__bar {
  display: flex;
  height: 26px;
  border: 2px solid var(--about-rail-line);
}

.page-about .about-team__seg {
  display: block;
}

.page-about .about-team__seg--a {
  flex: 14;
  background: var(--accent);
  border-right: 2px solid var(--navy-deep);
}

.page-about .about-team__seg--b {
  flex: 12;
  background: var(--mint);
  border-right: 2px solid var(--navy-deep);
}

.page-about .about-team__seg--c {
  flex: 10;
  background: var(--steel);
}

.page-about .about-team__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-team__item {
  border-top: 2px solid var(--about-rail-line);
  padding: 18px 0 0;
}

.page-about .about-team__num {
  font-size: var(--fs-6);
  line-height: 1;
  color: var(--mist);
  margin: 0 0 10px;
}

.page-about .about-team__role {
  font-size: var(--fs-4);
  font-weight: 400;
  margin: 0 0 10px;
  color: var(--accent);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 校对流程 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-flow__svg {
  display: block;
  width: 100%;
  height: auto;
  margin-bottom: clamp(18px, 3vw, 30px);
  overflow: visible;
}

.page-about .about-flow__boxes rect {
  fill: none;
  stroke: var(--accent);
  stroke-width: 2;
}

.page-about .about-flow__idx text {
  font-family: var(--font-mono);
  font-size: 14px;
  fill: var(--accent);
  letter-spacing: 0.08em;
}

.page-about .about-flow__name text {
  font-family: var(--font-body);
  font-size: 17px;
  fill: var(--mist);
}

.page-about .about-flow__note text {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--steel);
}

.page-about .about-step {
  border-top: 2px solid var(--about-rail-line);
}

.page-about .about-step:last-of-type {
  border-bottom: 2px solid var(--about-rail-line);
}

.page-about .about-step__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 16px;
  padding: 16px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-step__idx {
  color: var(--signal);
  font-size: var(--fs-2);
}

.page-about .about-step__title {
  font-size: var(--fs-4);
  color: var(--mist);
  flex: 1 1 auto;
}

.page-about .about-step__meta {
  font-family: var(--font-mono);
  font-size: var(--fs-1);
  letter-spacing: 0.06em;
  color: var(--text-dim);
}

.page-about .about-step[open] .about-step__title {
  color: var(--accent);
}

.page-about .about-step__body {
  padding: 0 0 20px;
}

.page-about .about-step__list {
  margin: 0;
  padding-left: 20px;
  max-width: 34em;
}

.page-about .about-step__list li {
  font-size: var(--fs-3);
  line-height: 1.85;
  color: var(--text);
  margin-bottom: 8px;
}

.page-about .about-flow__media {
  margin: 0;
  aspect-ratio: 3 / 4;
}

.page-about .about-flow__media .media__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  position: relative;
  margin-top: clamp(40px, 6vw, 72px);
  padding-block: clamp(48px, 7vw, 96px);
  border-top: 2px solid var(--about-rail-line);
  border-bottom: 2px solid var(--about-rail-line);
  background: var(--grass-deep);
  overflow: hidden;
}

.page-about .about-history__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  max-width: none;
  object-fit: cover;
  opacity: 0.26;
  filter: saturate(0.5) contrast(1.05);
}

.page-about .about-history__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-timeline {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__node {
  position: relative;
  padding: 0 0 clamp(28px, 4vw, 46px) 26px;
  border-left: 2px solid var(--about-rail-line);
}

.page-about .about-timeline__node:last-child {
  border-left-color: transparent;
  padding-bottom: 0;
}

.page-about .about-timeline__marker {
  position: absolute;
  left: -9px;
  top: 4px;
  width: 16px;
  height: 16px;
  border: 2px solid var(--accent);
  background: var(--navy-deep);
}

.page-about .about-timeline__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--fs-4);
  letter-spacing: -0.01em;
  margin: 6px 0 8px;
  color: var(--mist);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.85;
  max-width: 34em;
  color: var(--text);
}

.page-about .about-timeline__rail {
  border: 2px solid var(--about-rail-line);
  background: var(--about-panel-bg);
  padding: 20px;
}

.page-about .about-timeline__rail .eyebrow {
  margin: 0 0 14px;
  color: var(--accent);
}

.page-about .about-rail {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail__item {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 12px 0;
  border-top: 1px solid var(--about-rail-line);
}

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

.page-about .about-rail__item--now .about-rail__val {
  color: var(--signal);
}

.page-about .about-rail__key {
  font-size: var(--fs-2);
  letter-spacing: 0.08em;
  color: var(--text-dim);
}

.page-about .about-rail__val {
  font-size: var(--fs-4);
  color: var(--accent);
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-cover {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-cover__text p {
  margin: 0 0 18px;
  font-size: var(--fs-3);
  line-height: 1.85;
  max-width: 34em;
}

.page-about .about-cover__stats {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0 clamp(16px, 3vw, 32px);
}

.page-about .about-cover__stat {
  border-top: 2px solid var(--about-rail-line);
  padding: 14px 0;
}

.page-about .about-cover__num {
  display: block;
  font-size: var(--fs-5);
  line-height: 1;
  color: var(--accent);
}

.page-about .about-cover__label {
  display: block;
  margin-top: 8px;
  font-size: var(--fs-2);
  color: var(--text-dim);
  letter-spacing: 0.04em;
}

.page-about .about-cover__media {
  margin: 0;
  align-self: start;
}

.page-about .about-cover__media .media__img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 资质与参与 ---------- */
.page-about .about-trust {
  align-items: stretch;
}

.page-about .about-trust__card {
  padding: clamp(20px, 2.6vw, 28px);
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-trust__card .tag {
  align-self: flex-start;
}

.page-about .about-trust__title {
  font-family: var(--font-display);
  font-weight: 300;
  font-size: var(--fs-4);
  letter-spacing: -0.01em;
  margin: 0;
}

.page-about .about-trust__text {
  margin: 0;
  font-size: var(--fs-3);
  line-height: 1.85;
}

/* ---------- 合作入口 ---------- */
.page-about .about-coop {
  padding: clamp(24px, 4vw, 48px);
  background: var(--indigo);
}

.page-about .about-coop__text {
  max-width: 34em;
  margin: 0 0 clamp(20px, 3vw, 32px);
}

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

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__title {
    font-size: var(--fs-7);
  }

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

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
  }

  .page-about .about-flow {
    grid-template-columns: 7fr 4fr;
    align-items: start;
  }

  .page-about .about-cover {
    grid-template-columns: 7fr 5fr;
    align-items: start;
  }

  .page-about .about-timeline {
    grid-template-columns: 5fr 3fr;
    align-items: start;
  }

  .page-about .about-timeline__rail {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__title {
    font-size: var(--fs-8);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    animation-duration: 0.001ms !important;
    transition-duration: 0.001ms !important;
  }
}