.page-about {
  display: block;
  padding-block: clamp(1.25rem, 3vw, 2rem) clamp(3rem, 7vw, 5rem);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: .5rem;
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
  font-size: var(--fs-micro);
  letter-spacing: .08em;
  color: var(--text-mute);
}

.page-about .breadcrumb a {
  color: var(--text-mute);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--gold-300);
  border-bottom-color: var(--hairline-gold);
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--text-strong);
}

/* ---------- 首屏 ---------- */

.page-about .hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(1.5rem, 4vw, 2.75rem);
}

.page-about .hero__rail {
  position: relative;
  padding-left: 1.25rem;
}

.page-about .hero__rail::before {
  content: "";
  position: absolute;
  left: 0;
  top: .35rem;
  bottom: .35rem;
  width: 1px;
  background-image: repeating-linear-gradient(to bottom, var(--gold-500) 0 1px, transparent 1px 16px);
  opacity: .5;
}

.page-about .hero__index {
  margin: 0 0 .85rem;
  font-size: var(--fs-micro);
  letter-spacing: .22em;
  color: var(--gold-500);
}

.page-about .hero__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.7rem, 4.4vw, 2.9rem);
  line-height: 1.14;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .hero__title-mark {
  color: var(--gold-300);
}

.page-about .hero__lede {
  margin: 0 0 1.35rem;
  max-width: 46ch;
  font-size: var(--fs-body);
  line-height: 1.75;
  color: var(--text-base);
}

.page-about .hero__points {
  list-style: none;
  margin: 0 0 1.6rem;
  padding: 0;
  display: grid;
  gap: .55rem;
  font-size: var(--fs-small);
  color: var(--text-mute);
}

.page-about .hero__points li {
  position: relative;
  padding-left: 1.15rem;
}

.page-about .hero__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .68em;
  width: .75rem;
  height: 1px;
  background: var(--gold-500);
}

.page-about .hero__figure {
  margin: 0;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--ink-950);
  box-shadow: var(--shadow-card);
}

.page-about .hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 7 / 5;
  object-fit: cover;
}

/* ---------- 档案卡 ---------- */

.page-about .dossier {
  position: relative;
  padding: clamp(1.1rem, 2.6vw, 1.85rem);
  background: linear-gradient(158deg, var(--ink-800), var(--ink-900) 82%);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .dossier:hover,
.page-about .dossier:focus-within {
  transform: translateY(-4px);
  border-color: var(--hairline-gold);
  box-shadow: var(--shadow-lift);
}

.page-about .dossier:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 3px;
}

.page-about .dossier__head {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: .75rem;
  padding-bottom: .9rem;
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .dossier__code {
  font-size: var(--fs-micro);
  letter-spacing: .12em;
  color: var(--text-mute);
}

.page-about .dossier__title {
  margin: 1.1rem 0 1rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h3);
  color: var(--text-strong);
}

.page-about .dossier__list {
  margin: 0;
  padding: 0;
}

.page-about .dossier__row {
  display: grid;
  grid-template-columns: minmax(5rem, 30%) minmax(0, 1fr);
  gap: .35rem 1rem;
  padding: .58rem 0;
  border-bottom: 1px dashed var(--hairline-soft);
  font-size: var(--fs-small);
}

.page-about .dossier__row:last-child {
  border-bottom: 0;
}

.page-about .dossier__row dt {
  color: var(--text-mute);
  letter-spacing: .04em;
}

.page-about .dossier__row dd {
  margin: 0;
  color: var(--text-base);
  line-height: 1.6;
}

.page-about .dossier__more {
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height 220ms var(--ease), opacity 160ms var(--ease);
}

.page-about .dossier:hover .dossier__more,
.page-about .dossier:focus-within .dossier__more {
  max-height: 24rem;
  opacity: 1;
}

.page-about .dossier__more-label {
  margin: 1rem 0 .35rem;
  font-size: var(--fs-micro);
  letter-spacing: .18em;
  color: var(--celadon-500);
}

/* ---------- 章节标题 ---------- */

.page-about .history,
.page-about .teams,
.page-about .honors,
.page-about .eco,
.page-about .join {
  margin-top: clamp(3rem, 8vw, 5.5rem);
}

.page-about .section-head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
  max-width: 62ch;
}

.page-about .section-head__kicker {
  margin: 0 0 .6rem;
  font-size: var(--fs-micro);
  letter-spacing: .22em;
  color: var(--celadon-500);
}

.page-about .section-head h2 {
  margin: 0 0 .75rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h2);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--text-strong);
}

.page-about .section-head__lede {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.75;
  color: var(--text-mute);
}

/* ---------- 发展历程 ---------- */

.page-about .history__figure {
  margin: 0 0 clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--ink-950);
}

.page-about .history__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .timeline {
  display: grid;
  gap: 1.25rem;
}

.page-about .timeline__rail {
  display: flex;
  gap: .5rem;
  overflow-x: auto;
  padding-bottom: .5rem;
  scrollbar-width: thin;
}

.page-about .timeline__node {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: .55rem;
  flex: 0 0 auto;
  padding: .55rem .85rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-s);
  background: var(--ink-800);
  color: var(--text-mute);
  font-family: var(--font-body);
  font-size: var(--fs-small);
  line-height: 1;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .timeline__node:hover {
  color: var(--text-strong);
  border-color: var(--hairline-gold);
}

.page-about .timeline__node:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 2px;
}

.page-about .timeline__node[aria-selected="true"] {
  color: var(--white);
  background: var(--ink-700);
  border-color: var(--hairline-gold);
}

.page-about .timeline__ver {
  font-size: var(--fs-micro);
  letter-spacing: .06em;
  color: var(--gold-500);
}

.page-about .timeline__panels {
  display: grid;
  gap: 1rem;
}

.page-about .timeline__panel {
  padding: clamp(1.1rem, 3vw, 1.85rem);
  background: linear-gradient(150deg, var(--ink-800), var(--ink-900) 78%);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
}

.page-about .timeline__panel[hidden],
.page-about .timeline__panel[aria-hidden="true"] {
  display: none;
}

.page-about .timeline__panel-head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: .5rem 1rem;
  padding-bottom: .8rem;
  margin-bottom: .95rem;
  border-bottom: 1px solid var(--hairline-soft);
}

.page-about .timeline__panel-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: var(--fs-h3);
  color: var(--text-strong);
}

.page-about .timeline__stamp {
  font-size: var(--fs-micro);
  letter-spacing: .1em;
  color: var(--gold-300);
  white-space: nowrap;
}

.page-about .timeline__text {
  margin: 0 0 .95rem;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--text-base);
}

.page-about .timeline__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .55rem;
  font-size: var(--fs-small);
  color: var(--text-mute);
}

.page-about .timeline__list li {
  position: relative;
  padding-left: 1.15rem;
}

.page-about .timeline__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .72em;
  width: .7rem;
  height: 1px;
  background: var(--celadon-500);
}

/* ---------- 团队与地域 ---------- */

.page-about .teams__figure {
  margin: 0 0 clamp(1.25rem, 3vw, 2rem);
  border: 1px solid var(--hairline);
  border-radius: var(--radius-m);
  overflow: hidden;
  background: var(--ink-950);
}

.page-about .teams__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

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

.page-about .teams__card {
  padding: 1.15rem 1.2rem;
  border-radius: var(--radius-m);
}

.page-about .teams__region {
  margin: 0 0 .6rem;
  font-size: var(--fs-micro);
  letter-spacing: .14em;
  color: var(--gold-500);
}

.page-about .teams__name {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--text-strong);
}

.page-about .teams__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--text-mute);
}

/* ---------- 资质认可（浅色节奏区） ---------- */

.page-about .honors {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: var(--paper-050);
  border-radius: var(--radius-m);
}

.page-about .section-head--light h2 {
  color: var(--ink-900);
}

.page-about .section-head--light .section-head__kicker {
  color: #2F7A6C;
}

.page-about .section-head--light .section-head__lede {
  color: rgba(11, 27, 43, .68);
}

.page-about .honors__stamps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-bottom: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .stamp {
  padding: 1.1rem 1.25rem;
  background: #FFFFFF;
  border: 1px solid rgba(11, 27, 43, .16);
  border-left: 3px solid var(--gold-500);
  border-radius: var(--radius-s);
  box-shadow: 0 1px 0 rgba(11, 27, 43, .04), 0 14px 24px -22px rgba(11, 27, 43, .75);
  transform: rotate(-1.1deg);
  transition: transform var(--dur) var(--ease);
}

.page-about .stamp:nth-child(2) {
  transform: rotate(1deg);
}

.page-about .stamp:hover,
.page-about .stamp:focus-within {
  transform: rotate(0deg) translateY(-3px);
}

.page-about .stamp__year {
  margin: 0 0 .45rem;
  font-size: var(--fs-micro);
  letter-spacing: .14em;
  color: #9A7628;
}

.page-about .stamp__name {
  margin: 0 0 .45rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--ink-900);
}

.page-about .stamp__text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: rgba(11, 27, 43, .66);
}

.page-about .honors__facts {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: .75rem;
  margin: 0;
  padding-top: clamp(1rem, 2.5vw, 1.5rem);
  border-top: 1px solid rgba(11, 27, 43, .14);
}

.page-about .honors__fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  font-size: var(--fs-small);
}

.page-about .honors__fact dt {
  color: rgba(11, 27, 43, .62);
}

.page-about .honors__fact dd {
  margin: 0;
  font-family: var(--font-mono);
  color: var(--ink-900);
  letter-spacing: .02em;
}

/* ---------- 生态合作 ---------- */

.page-about .eco__filters {
  display: flex;
  flex-wrap: wrap;
  gap: .5rem;
}

.page-about .eco__filter {
  padding: .45rem .95rem;
  border: 1px solid var(--hairline);
  border-radius: var(--radius-pill);
  background: transparent;
  color: var(--text-mute);
  font-family: var(--font-body);
  font-size: var(--fs-small);
  line-height: 1.4;
  cursor: pointer;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease), background-color var(--dur) var(--ease);
}

.page-about .eco__filter:hover {
  color: var(--amber-500);
  border-color: var(--amber-500);
}

.page-about .eco__filter:focus-visible {
  outline: 2px solid var(--amber-500);
  outline-offset: 2px;
}

.page-about .eco__filter[data-current] {
  color: var(--ink-950);
  background: var(--gold-500);
  border-color: var(--gold-500);
}

.page-about .eco__filter[data-current]:hover {
  background: var(--gold-300);
  border-color: var(--gold-300);
  color: var(--ink-950);
}

.page-about .eco__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1rem;
  margin-top: 1.25rem;
}

.page-about .eco__card {
  padding: 1.15rem 1.2rem;
  border-radius: var(--radius-m);
}

.page-about .eco__card-type {
  margin: 0 0 .55rem;
  font-size: var(--fs-micro);
  letter-spacing: .18em;
  color: var(--celadon-500);
}

.page-about .eco__card h3 {
  margin: 0 0 .5rem;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.0625rem;
  color: var(--text-strong);
}

.page-about .eco__card-text {
  margin: 0;
  font-size: var(--fs-small);
  line-height: 1.7;
  color: var(--text-mute);
}

/* ---------- 合作加入 ---------- */

.page-about .join__card {
  padding: clamp(1.5rem, 4vw, 3rem);
  background: linear-gradient(140deg, var(--ink-800), var(--ink-950) 88%);
  border: 1px solid var(--hairline-gold);
  border-radius: var(--radius-m);
  box-shadow: var(--shadow-card);
}

.page-about .join__kicker {
  margin: 0 0 .75rem;
  font-size: var(--fs-micro);
  letter-spacing: .22em;
  color: var(--gold-500);
}

.page-about .join__card h2 {
  margin: 0 0 .85rem;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.4rem, 3.2vw, 2rem);
  line-height: 1.2;
  color: var(--white);
}

.page-about .join__text {
  margin: 0 0 1.5rem;
  max-width: 58ch;
  font-size: var(--fs-small);
  line-height: 1.8;
  color: var(--text-base);
}

.page-about .join__actions {
  display: flex;
  flex-wrap: wrap;
  gap: .75rem;
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .teams__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .honors__fact {
    flex-direction: column;
    align-items: flex-start;
    gap: .35rem;
  }

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

@media (min-width: 900px) {
  .page-about .timeline {
    grid-template-columns: minmax(170px, 205px) minmax(0, 1fr);
    gap: clamp(1.75rem, 4vw, 3.25rem);
    align-items: start;
  }

  .page-about .timeline__rail {
    flex-direction: column;
    align-items: stretch;
    overflow: visible;
    padding: 0 0 0 1.1rem;
    border-left: 1px solid var(--hairline);
  }

  .page-about .timeline__node {
    justify-content: flex-start;
  }

  .page-about .timeline__node::before {
    content: "";
    position: absolute;
    left: -1.38rem;
    top: 50%;
    width: .5rem;
    height: .5rem;
    margin-top: -.25rem;
    border-radius: 50%;
    border: 1px solid var(--hairline-gold);
    background: var(--ink-950);
    transition: background-color var(--dur) var(--ease), border-color var(--dur) var(--ease);
  }

  .page-about .timeline__node[aria-selected="true"]::before {
    background: var(--gold-500);
    border-color: var(--gold-500);
  }
}

@media (min-width: 960px) {
  .page-about .hero {
    grid-template-columns: minmax(0, 0.94fr) minmax(0, 1.06fr);
    align-items: start;
    gap: clamp(2rem, 5vw, 4rem);
  }

  .page-about .hero__rail {
    padding-left: 3.25rem;
  }

  .page-about .hero__index {
    position: absolute;
    left: 1.1rem;
    top: .15rem;
    margin: 0;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: .3em;
  }
}

@media (min-width: 1080px) {
  .page-about .teams__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .dossier,
  .page-about .dossier__more,
  .page-about .stamp,
  .page-about .timeline__node,
  .page-about .eco__filter,
  .page-about .timeline__node::before {
    transition: none;
  }

  .page-about .dossier:hover,
  .page-about .dossier:focus-within,
  .page-about .stamp:hover {
    transform: none;
  }
}