.page-about {
  --about-rail-w: 176px;
  --about-cut: 20px;
}

/* ---------- 首屏 ---------- */
.page-about .about-breadcrumb {
  margin-bottom: clamp(24px, 3vw, 40px);
}

.page-about .about-hero {
  padding-block: clamp(40px, 6vw, 84px) clamp(36px, 5vw, 68px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 56px);
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  line-height: 1.06;
  letter-spacing: -0.015em;
  color: var(--cream);
}

.page-about .about-hero__lede {
  margin-top: 20px;
  max-width: 34em;
  color: rgba(245, 240, 230, 0.82);
  line-height: 1.85;
}

.page-about .about-hero__facts {
  margin: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(200, 162, 90, 0.34);
  border: 1px solid rgba(200, 162, 90, 0.34);
}

.page-about .about-fact {
  background: var(--ink-green);
  padding: 16px 14px 14px;
}

.page-about .about-fact dt {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: rgba(200, 162, 90, 0.86);
  margin-bottom: 8px;
}

.page-about .about-fact__num {
  margin: 0;
  font-size: clamp(1.25rem, 2.4vw, 1.6rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--gold-bright);
}

/* ---------- 首屏通栏图 ---------- */
.page-about .about-band {
  background: var(--cream);
}

.page-about .about-band__frame {
  margin: 0;
  overflow: hidden;
}

.page-about .about-band__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-band__caption {
  margin: 0;
  padding: 12px clamp(20px, 4vw, 40px) 0;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--slate-text);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-stage {
  background-color: var(--cream);
  background-image:
    linear-gradient(rgba(110, 127, 140, 0.08) 1px, transparent 1px),
    linear-gradient(90deg, rgba(110, 127, 140, 0.08) 1px, transparent 1px);
  background-size: 48px 48px;
  padding-block: clamp(44px, 6vw, 88px);
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 48px);
}

/* ---------- 左侧年份刻度 ---------- */
.page-about .about-rail__title {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--slate-text);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__link {
  flex: 0 0 auto;
  display: flex;
  align-items: baseline;
  gap: 7px;
  padding: 8px 14px;
  border: 1px solid var(--slate-line);
  border-radius: 4px;
  background: var(--card);
  text-decoration: none;
  color: var(--slate-text);
  white-space: nowrap;
  transition: border-color var(--dur-indicator) var(--ease-out),
              background-color var(--dur-indicator) var(--ease-out),
              color var(--dur-indicator) var(--ease-out);
}

.page-about .about-rail__num {
  font-size: 17px;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--ink-green);
}

.page-about .about-rail__label {
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .about-rail__link.is-active,
.page-about .about-rail__link:hover {
  border-color: var(--gold);
  background: var(--ink-green);
}

.page-about .about-rail__link.is-active .about-rail__num,
.page-about .about-rail__link:hover .about-rail__num {
  color: var(--gold-bright);
}

.page-about .about-rail__link.is-active .about-rail__label,
.page-about .about-rail__link:hover .about-rail__label {
  color: rgba(245, 240, 230, 0.85);
}

/* ---------- 正文分章 ---------- */
.page-about .about-body {
  min-width: 0;
}

.page-about .about-chapter {
  position: relative;
  padding-block: clamp(30px, 4vw, 52px);
  border-top: 1px solid rgba(14, 42, 36, 0.16);
}

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

.page-about .about-chapter::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 96px;
  height: 2px;
  background: linear-gradient(to right, var(--gold), rgba(200, 162, 90, 0));
  transform: rotate(-11deg);
  transform-origin: left top;
  pointer-events: none;
}

.page-about .about-chapter:first-child::before {
  display: none;
}

.page-about .about-chapter__year {
  display: inline-block;
  position: relative;
  margin: 0 0 10px;
  padding-bottom: 10px;
  font-size: clamp(3rem, 8vw, 5.2rem);
  font-weight: 300;
  line-height: 0.92;
  letter-spacing: -0.02em;
  font-variant-numeric: tabular-nums;
  color: var(--ink-green);
}

.page-about .about-chapter__year::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 58px;
  height: 1px;
  background: var(--gold);
}

.page-about .about-chapter__title {
  margin: 0 0 18px;
  font-size: clamp(1.35rem, 2.8vw, 1.9rem);
  line-height: 1.3;
  color: var(--ink-black);
}

.page-about .about-chapter__intro {
  margin: 0 0 24px;
  max-width: 36em;
  line-height: 1.8;
  color: var(--slate-text);
}

.page-about .about-chapter__body p {
  max-width: 38em;
  margin: 0 0 1.1em;
  line-height: 1.85;
  color: var(--ink-black);
}

.page-about .about-chapter__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter__body a,
.page-about .about-partners__cta a,
.page-about .about-principle__text a {
  color: var(--cinnabar);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .about-chapter__body a:hover,
.page-about .about-partners__cta a:hover,
.page-about .about-principle__text a:hover {
  color: var(--ink-green);
}

/* ---------- 发展历程 ---------- */
.page-about .about-road-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 40px);
}

.page-about .about-road {
  position: relative;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
}

.page-about .about-road::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--gold), rgba(200, 162, 90, 0.18));
}

.page-about .about-road__item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .about-road__item::before {
  content: "";
  position: absolute;
  left: -22px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cream);
  border: 2px solid var(--gold);
}

.page-about .about-road__item:first-child::before {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
}

.page-about .about-road__year {
  display: block;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--ink-green);
}

.page-about .about-road__name {
  margin: 8px 0 6px;
  font-size: 1rem;
  letter-spacing: 0.02em;
  color: var(--ink-black);
}

.page-about .about-road__text {
  margin: 0;
  max-width: 34em;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--slate-text);
}

.page-about .about-road__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--slate-line);
}

.page-about .about-road__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-road__media .media-caption {
  padding: 10px 14px 12px;
  background: var(--card);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 26px;
}

.page-about .about-team__card {
  position: relative;
  padding: 22px 20px 20px;
  background: var(--card);
  border: 1px solid var(--slate-line);
  clip-path: polygon(var(--about-cut) 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%, 0 var(--about-cut));
  transition: transform var(--dur-indicator) var(--ease-out),
              border-color var(--dur-indicator) var(--ease-out);
}

.page-about .about-team__card:hover {
  transform: translateY(-4px);
}

.page-about .about-team__idx {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-team__role {
  margin: 0 0 6px;
  font-size: 1.05rem;
  color: var(--ink-black);
}

.page-about .about-team__num {
  margin: 0 0 10px;
  font-size: 1.9rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--ink-green);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--slate-text);
}

.page-about .about-team__more {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.75;
  color: var(--slate-text);
}

.page-about .about-team__note {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin-top: 26px;
  padding-top: 22px;
  border-top: 1px dashed var(--slate-line);
}

.page-about .about-team__media {
  margin: 0;
  overflow: hidden;
  border: 1px solid var(--slate-line);
}

.page-about .about-team__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}

.page-about .about-team__note p {
  margin: 0;
  max-width: 36em;
  line-height: 1.85;
  color: var(--ink-black);
}

/* ---------- 原则 ---------- */
.page-about .about-principles {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-principle {
  padding: 22px 20px;
  background: var(--ink-green);
  clip-path: polygon(var(--about-cut) 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%, 0 var(--about-cut));
}

.page-about .about-principle__idx {
  display: inline-block;
  margin-bottom: 10px;
  padding-bottom: 6px;
  border-bottom: 1px solid var(--gold);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .about-principle__name {
  margin: 0 0 12px;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--cream);
}

.page-about .about-principle__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.85;
  color: rgba(245, 240, 230, 0.8);
}

.page-about .about-principle__text a {
  color: var(--gold-bright);
  text-decoration: underline;
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.page-about .about-principle__text a:hover {
  color: var(--cream);
}

/* ---------- 共建 ---------- */
.page-about .about-partners {
  margin-top: 22px;
  border-bottom: 1px solid var(--slate-line);
}

.page-about .about-partner {
  border-top: 1px solid var(--slate-line);
}

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

.page-about .about-partner__trigger {
  display: flex;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: 18px 2px;
  border: 0;
  background: none;
  font-family: inherit;
  font-size: 1rem;
  color: var(--ink-black);
  text-align: left;
  cursor: pointer;
  transition: color var(--dur-indicator) var(--ease-out);
}

.page-about .about-partner__trigger:hover {
  color: var(--ink-green);
}

.page-about .about-partner__idx {
  font-size: 12px;
  letter-spacing: 0.18em;
  font-variant-numeric: tabular-nums;
  color: var(--gold);
}

.page-about .about-partner__name {
  flex: 1 1 auto;
  font-weight: 500;
}

.page-about .about-partner__mark {
  position: relative;
  flex: 0 0 auto;
  width: 14px;
  height: 14px;
}

.page-about .about-partner__mark::before,
.page-about .about-partner__mark::after {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
  background: var(--cinnabar);
  transition: transform var(--dur-indicator) var(--ease-out);
}

.page-about .about-partner__mark::after {
  transform: rotate(90deg);
}

.page-about .about-partner__trigger[aria-expanded="true"] .about-partner__mark::after {
  transform: rotate(0deg);
}

.page-about .about-partner__panel {
  padding: 0 2px 20px;
}

.page-about .about-partner__panel p {
  margin: 0;
  max-width: 38em;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--slate-text);
}

.page-about .about-partners__cta {
  margin: 22px 0 0;
  max-width: 38em;
  line-height: 1.85;
  color: var(--ink-black);
}

/* ---------- 页尾回环 ---------- */
.page-about .about-close {
  padding-block: clamp(44px, 6vw, 84px);
}

.page-about .about-close__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 4vw, 52px);
}

.page-about .about-close__title {
  margin: 12px 0 16px;
  color: var(--cream);
}

.page-about .about-close__text {
  margin: 0 0 24px;
  max-width: 34em;
  line-height: 1.85;
  color: rgba(245, 240, 230, 0.8);
}

.page-about .about-close__track {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: rgba(200, 162, 90, 0.28);
  border: 1px solid rgba(200, 162, 90, 0.28);
}

.page-about .about-close__track li {
  background: var(--ink-green);
  padding: 16px 14px;
}

.page-about .about-close__yr {
  display: block;
  font-size: 1.35rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1.1;
  color: var(--gold-bright);
}

.page-about .about-close__tag {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: rgba(245, 240, 230, 0.7);
}

/* ---------- 响应式 ---------- */
@media (min-width: 760px) {
  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    align-items: start;
  }

  .page-about .about-team__card:nth-child(2) {
    margin-top: 30px;
  }

  .page-about .about-team__card:nth-child(3) {
    margin-top: 60px;
  }

  .page-about .about-team__note {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: center;
  }

  .page-about .about-close__track {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(220px, 0.85fr);
    align-items: end;
  }

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

  .page-about .about-principle:nth-child(2) {
    margin-top: 26px;
  }

  .page-about .about-principle:nth-child(3) {
    margin-top: 52px;
  }

  .page-about .about-close__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: center;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 64px);
  }

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

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0;
    padding: 0;
    overflow: visible;
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 12px 0 12px 16px;
    border: 0;
    border-left: 2px solid var(--slate-line);
    border-radius: 0;
    background: none;
  }

  .page-about .about-rail__num {
    font-size: 26px;
    color: var(--slate-text);
    transition: color var(--dur-indicator) var(--ease-out);
  }

  .page-about .about-rail__label {
    color: var(--slate-text);
  }

  .page-about .about-rail__link.is-active,
  .page-about .about-rail__link:hover {
    border-left-color: var(--gold);
    background: none;
  }

  .page-about .about-rail__link.is-active .about-rail__num,
  .page-about .about-rail__link:hover .about-rail__num {
    color: var(--ink-green);
  }

  .page-about .about-rail__link.is-active .about-rail__label,
  .page-about .about-rail__link:hover .about-rail__label {
    color: var(--gold);
  }
}

@media (min-width: 1100px) {
  .page-about .about-road-wrap {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-road__media {
    position: sticky;
    top: 104px;
  }
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .about-team__more {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    opacity: 0;
    transition: max-height var(--dur-indicator) var(--ease-out),
                opacity var(--dur-enter) var(--ease-out),
                margin-top var(--dur-indicator) var(--ease-out);
  }

  .page-about .about-team__card:hover .about-team__more,
  .page-about .about-team__card:focus-within .about-team__more {
    max-height: 12rem;
    margin-top: 12px;
    opacity: 1;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-rail__link,
  .page-about .about-partner__trigger,
  .page-about .about-team__more {
    transition: none;
  }

  .page-about .about-team__card:hover {
    transform: none;
  }
}