.page-about {
  --about-line: rgba(31, 109, 110, .24);
  --about-line-soft: rgba(31, 109, 110, .12);
  --about-tint: rgba(217, 229, 229, .55);
  background: var(--cream);
  color: var(--ink);
  overflow-x: clip;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* ── 面包屑 ───────────────────────────── */
.page-about .breadcrumbs {
  padding: 18px 0 0;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--muted);
}

.page-about .breadcrumbs__list li + li::before {
  content: "/";
  margin-right: 6px;
  color: var(--about-line);
}

.page-about .breadcrumbs__list a {
  color: var(--mid);
  text-decoration: none;
}

.page-about .breadcrumbs__list a:hover {
  color: var(--accent-hover);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ── 首屏 ─────────────────────────────── */
.page-about .about-hero {
  padding: clamp(24px, 4.5vw, 52px) 0 0;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  align-items: start;
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-size: clamp(30px, 6vw, 52px);
  line-height: 1.16;
  font-weight: 900;
  letter-spacing: -.015em;
  color: var(--deep);
}

.page-about .about-hero__text {
  margin: 18px 0 0;
  max-width: 34em;
  font-size: clamp(15.5px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero__figure {
  margin: 0;
  position: relative;
}

.page-about .about-hero__figure .media-frame__inner {
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-2);
}

.page-about .about-hero__figure img {
  width: 100%;
  aspect-ratio: 22 / 15;
  object-fit: cover;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4.5vw, 48px) 0 0;
  padding: 0;
  list-style: none;
  background: var(--about-line-soft);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-hero__stats .stat {
  background: var(--cream);
  padding: 18px 20px;
  display: grid;
  gap: 4px;
}

.page-about .about-hero__stats .stat__num {
  font-size: clamp(22px, 2.6vw, 30px);
  font-weight: 700;
  color: var(--deep);
  line-height: 1.1;
}

.page-about .about-hero__stats .stat__label {
  font-size: 13px;
  color: var(--muted);
}

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

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
  }
}

/* ── 页内导航 ─────────────────────────── */
.page-about .about-anchors {
  margin-top: clamp(28px, 4vw, 48px);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  background: var(--mist);
}

.page-about .about-anchors__list {
  display: flex;
  gap: 6px;
  overflow-x: auto;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  scrollbar-width: thin;
}

.page-about .about-anchors__link {
  display: inline-block;
  white-space: nowrap;
  padding: 7px 15px;
  border-radius: var(--pill);
  border: 1px solid transparent;
  font-size: 13.5px;
  color: var(--deep);
  text-decoration: none;
  transition: background var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-anchors__link:hover {
  background: var(--cream);
  border-color: var(--about-line);
}

.page-about .about-anchors__link[aria-current="true"],
.page-about .about-anchors__link[aria-current="location"],
.page-about .about-anchors__link[aria-current="page"] {
  background: var(--deep);
  color: var(--cream);
  border-color: var(--deep);
}

/* ── 发展历程 ─────────────────────────── */
.page-about .about-timeline__grid {
  display: grid;
  gap: clamp(28px, 4vw, 44px);
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 36px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 11px;
  top: 10px;
  bottom: 26px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--mid) 0%, var(--about-line) 72%, transparent 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3.4vw, 34px);
}

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

.page-about .timeline__node {
  position: absolute;
  left: -36px;
  top: 1px;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--mid);
  color: var(--mid);
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .timeline__node svg {
  width: 12px;
  height: 12px;
  display: block;
}

.page-about .timeline__item:hover .timeline__node {
  transform: scale(1.12);
  border-color: var(--accent);
  color: var(--accent);
}

.page-about .timeline__year {
  margin: 0;
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--accent);
  font-weight: 600;
}

.page-about .timeline__title {
  margin: 6px 0 0;
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 800;
  color: var(--deep);
  line-height: 1.4;
}

.page-about .timeline__text {
  margin: 8px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
  max-width: 40em;
}

.page-about .aside-stack {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .aside-card {
  background: var(--mist);
  border: 1px solid var(--about-line-soft);
  border-radius: var(--r-md);
  padding: 22px 24px;
}

.page-about .aside-card--accent {
  background: var(--cream);
  border-color: var(--accent-soft);
  border-left: 3px solid var(--accent);
}

.page-about .aside-card__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .aside-card__title {
  margin: 10px 0 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--deep);
  line-height: 1.5;
}

.page-about .aside-card__list {
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
  font-size: 14.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .aside-card__list li {
  padding-left: 16px;
  position: relative;
}

.page-about .aside-card__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--mid);
}

.page-about .aside-card__list strong {
  color: var(--deep);
  font-weight: 700;
}

.page-about .aside-card__text {
  margin: 12px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink);
}

@media (min-width: 960px) {
  .page-about .about-timeline__grid {
    grid-template-columns: minmax(0, 1.42fr) minmax(0, .88fr);
  }
}

/* ── 横向节奏带 ───────────────────────── */
.page-about .about-ribbon {
  background: var(--deep);
  color: var(--cream);
  padding: clamp(16px, 2.6vw, 24px) 0;
}

.page-about .about-ribbon__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  margin: 0;
  padding: 0;
  list-style: none;
  align-items: center;
}

.page-about .about-ribbon__item {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  font-size: 14px;
  line-height: 1.6;
}

.page-about .about-ribbon__item::before {
  content: "";
  flex: none;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--accent);
}

.page-about .about-ribbon__item .mono {
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--accent);
  font-weight: 600;
}

/* ── 服务理念 ─────────────────────────── */
.page-about .scene-grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(24px, 4vw, 38px);
}

.page-about .scene {
  background: var(--cream);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  padding: 24px 26px;
  display: grid;
  gap: 10px;
  align-content: start;
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .scene:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-1);
}

.page-about .scene__no {
  margin: 0;
  font-size: 12.5px;
  letter-spacing: .12em;
  color: var(--accent);
  font-weight: 600;
}

.page-about .scene__title {
  margin: 0;
  font-size: clamp(18px, 2vw, 21px);
  font-weight: 800;
  color: var(--deep);
  line-height: 1.45;
}

.page-about .scene__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink);
}

@media (min-width: 760px) {
  .page-about .scene-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 22px;
  }

  .page-about .scene:nth-child(even) {
    margin-top: 38px;
  }
}

/* ── 团队 ─────────────────────────────── */
.page-about .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0 0 20px;
}

.page-about .tab {
  font-family: inherit;
  font-size: 14px;
  line-height: 1.4;
  padding: 9px 17px;
  border-radius: var(--pill);
  border: 1px solid var(--about-line);
  background: var(--cream);
  color: var(--deep);
  cursor: pointer;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease), border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .tab:hover {
  border-color: var(--mid);
  transform: translateY(-1px);
}

.page-about .tab[aria-selected="true"] {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--cream);
}

.page-about .tab:focus-visible,
.page-about .about-anchors__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 2px;
}

.page-about .team-panel {
  background: var(--cream);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  padding: clamp(22px, 3vw, 32px);
}

.page-about .team-panel__head {
  display: flex;
  align-items: baseline;
  gap: 14px;
  flex-wrap: wrap;
}

.page-about .team-panel__count {
  font-size: 34px;
  font-weight: 700;
  color: var(--deep);
  line-height: 1;
}

.page-about .team-panel__title {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 800;
  color: var(--deep);
}

.page-about .team-panel__text {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 52em;
}

/* ── 质量流程 ─────────────────────────── */
.page-about .about-quality__grid {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  margin-top: clamp(24px, 4vw, 40px);
  align-items: start;
}

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

.page-about .quality-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 16px;
  padding: 18px 0;
  border-bottom: 1px dashed var(--about-line);
}

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

.page-about .quality-step:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .quality-step__no {
  font-size: 20px;
  font-weight: 700;
  color: var(--mid);
  line-height: 1.5;
}

.page-about .quality-step__title {
  margin: 0;
  font-size: 17px;
  font-weight: 800;
  color: var(--deep);
}

.page-about .quality-step__text {
  margin: 6px 0 0;
  font-size: 14.8px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-quality__figure {
  margin: 0;
  position: relative;
}

.page-about .about-quality__figure .media-frame__inner {
  border-radius: var(--r-lg);
  overflow: hidden;
  box-shadow: var(--shadow-1);
}

.page-about .about-quality__figure img {
  width: 100%;
  aspect-ratio: 19 / 13;
  object-fit: cover;
}

@media (min-width: 920px) {
  .page-about .about-quality__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, .95fr);
  }
}

/* ── 合作生态 ─────────────────────────── */
.page-about .eco-panel {
  background: var(--cream);
  border: 1px solid var(--about-line);
  border-radius: var(--r-lg);
  padding: clamp(22px, 3vw, 30px);
}

.page-about .eco-panel__title {
  margin: 0;
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 800;
  color: var(--deep);
}

.page-about .eco-panel__text {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
  max-width: 52em;
}

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

.page-about .eco-panel__list li {
  display: inline-block;
  padding: 7px 14px;
  border-radius: var(--pill);
  background: var(--accent-soft);
  color: var(--deep);
  font-size: 13.5px;
  line-height: 1.5;
}

.page-about .about-ecosystem__grid {
  display: grid;
  gap: 20px;
  margin-top: clamp(26px, 4vw, 40px);
  align-items: stretch;
}

.page-about .about-ecosystem__figure {
  margin: 0;
}

.page-about .about-ecosystem__figure .media-frame__inner {
  border-radius: var(--r-lg);
  overflow: hidden;
  height: 100%;
}

.page-about .about-ecosystem__figure img {
  width: 100%;
  height: 100%;
  aspect-ratio: 15 / 8;
  object-fit: cover;
}

.page-about .eco-coverage {
  background: var(--deep);
  color: var(--cream);
  border-radius: var(--r-lg);
  padding: clamp(22px, 3vw, 30px);
  display: grid;
  align-content: center;
  gap: 8px;
}

.page-about .eco-coverage__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--accent);
}

.page-about .eco-coverage__num {
  margin: 0;
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--cream);
}

.page-about .eco-coverage__text {
  margin: 6px 0 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(247, 243, 234, .86);
}

@media (min-width: 860px) {
  .page-about .about-ecosystem__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, .85fr);
  }
}

/* ── 资质与荣誉 ───────────────────────── */
.page-about .about-trust__list {
  margin-top: clamp(22px, 3.4vw, 34px);
  display: grid;
  gap: 0;
}

.page-about .about-trust__list .index-list__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) auto;
  align-items: baseline;
  gap: 14px;
  padding: 16px 4px;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-trust__list .index-list__no {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-trust__list .index-list__title {
  font-size: 15.8px;
  font-weight: 600;
  color: var(--deep);
  line-height: 1.6;
}

.page-about .about-trust__list .index-list__date {
  font-size: 13px;
  color: var(--accent);
  white-space: nowrap;
}

.page-about .about-trust__note {
  margin: clamp(22px, 3vw, 30px) 0 0;
  padding: 18px 22px;
  background: var(--mist);
  border-radius: var(--r-md);
  font-size: 14.8px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-trust__note .link-accent {
  color: var(--accent-hover);
  font-weight: 600;
  text-decoration: underline;
  text-underline-offset: 3px;
  text-decoration-thickness: 1px;
}

.page-about .about-trust__note .link-accent:hover {
  color: var(--accent);
}

/* ── 加入与合作 ───────────────────────── */
.page-about .about-join {
  background: var(--deep);
  color: var(--cream);
}

.page-about .about-join__inner {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-join .eyebrow {
  color: var(--accent);
}

.page-about .about-join__title {
  margin: 10px 0 0;
  font-size: clamp(24px, 3.6vw, 36px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--cream);
}

.page-about .about-join__text {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.9;
  color: rgba(247, 243, 234, .85);
  max-width: 46em;
}

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

@media (min-width: 900px) {
  .page-about .about-join__inner {
    grid-template-columns: minmax(0, 1.5fr) auto;
    gap: 40px;
  }

  .page-about .about-join__actions {
    flex-direction: column;
    align-items: stretch;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .scene,
  .page-about .tab,
  .page-about .timeline__node {
    transition: none;
  }

  .page-about .scene:hover,
  .page-about .tab:hover,
  .page-about .timeline__item:hover .timeline__node {
    transform: none;
  }
}