.page-about {
  --about-line: 1px solid var(--line);
  --about-line-strong: 1px solid var(--line-strong);
  --about-gold-line: 1px solid var(--gold-line);
  --about-index-w: 7.5rem;
  background: var(--paper);
  color: var(--ink);
  padding-bottom: 1rem;
}

.page-about .breadcrumbs {
  padding-block: 1.15rem .4rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: .5rem;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 1.75rem;
  border-top: var(--about-line-strong);
  padding-top: 1.5rem;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.8rem, 6.4vw, 3.1rem);
  line-height: 1.2;
  letter-spacing: .01em;
  color: var(--green);
  margin: .7rem 0 1rem;
  text-wrap: balance;
}

.page-about .about-hero__lede {
  max-width: 52ch;
  font-size: clamp(.95rem, 2.6vw, 1.06rem);
  line-height: 1.8;
}

.page-about .about-hero__side {
  position: relative;
  border: var(--about-line-strong);
  background: linear-gradient(180deg, var(--cream) 0%, rgba(230, 216, 190, .38) 100%);
  padding: 1.15rem 1.1rem 1.25rem;
}

.page-about .about-hero__side::before {
  content: "";
  position: absolute;
  top: 5px;
  right: 5px;
  width: 11px;
  height: 11px;
  border-top: 1px solid var(--gold);
  border-right: 1px solid var(--gold);
}

.page-about .about-hero__side-title {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .22em;
  color: var(--copper);
  margin: 0 0 .9rem;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: .8rem;
}

.page-about .about-hero__stat {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: .7rem;
  align-items: baseline;
  border-top: var(--about-line);
  padding-top: .7rem;
}

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

.page-about .about-hero__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  letter-spacing: .02em;
  color: var(--green);
}

.page-about .about-hero__num small {
  font-size: .68em;
  margin-left: .1em;
}

.page-about .about-hero__stat-label {
  font-size: .84rem;
  line-height: 1.55;
  color: var(--gray);
}

.page-about .about-hero__figure {
  margin: 1.75rem 0 0;
  --media-ratio: 3 / 2;
  border: var(--about-line-strong);
}

.page-about .media-frame__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-caption {
  margin: .65rem 0 0;
  font-size: .8rem;
  line-height: 1.65;
  color: var(--gray);
  max-width: 62ch;
}

/* ---------- 通用分区节奏 ---------- */
.page-about .section {
  padding-block: clamp(2.25rem, 6vw, 4rem);
}

.page-about .section__head {
  margin-bottom: clamp(1.25rem, 3vw, 2rem);
}

/* ---------- 缘起 ---------- */
.page-about .about-origin__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-origin__main p {
  font-size: .96rem;
  line-height: 1.85;
}

.page-about .about-origin__main p + p {
  margin-top: 1rem;
}

.page-about .about-aside {
  border-top: 2px solid var(--gold);
  padding-top: 1rem;
}

.page-about .about-aside__note {
  font-family: var(--font-hand);
  font-size: 1.05rem;
  line-height: 1.6;
  color: var(--copper);
  margin: 0 0 1.1rem;
}

.page-about .about-aside__title {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .2em;
  color: var(--gray);
  margin: 0 0 .5rem;
}

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

.page-about .about-facts li {
  display: grid;
  grid-template-columns: 4.6rem minmax(0, 1fr);
  gap: .7rem;
  padding-block: .62rem;
  border-bottom: var(--about-line);
  font-size: .86rem;
  line-height: 1.6;
}

.page-about .about-facts__key {
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--copper);
  padding-top: .12rem;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__layout {
  display: grid;
  gap: 1.75rem;
}

.page-about .year-index__label {
  font-family: var(--font-mono);
  font-size: .68rem;
  letter-spacing: .2em;
  color: var(--gray);
  margin: 0 0 .6rem;
}

.page-about .year-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 .4rem;
  display: flex;
  gap: .4rem;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .year-index__link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 4.2rem;
  padding: .48rem .7rem;
  border: 1px solid var(--line-strong);
  font-family: var(--font-mono);
  font-size: .78rem;
  letter-spacing: .04em;
  color: var(--green);
  text-decoration: none;
  white-space: nowrap;
  transition: background .16s ease, color .16s ease, border-color .16s ease;
}

.page-about .year-index__link:hover,
.page-about .year-index__link:focus-visible {
  background: var(--green);
  border-color: var(--green);
  color: var(--cream);
}

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

.page-about .timeline__item {
  position: relative;
  padding-left: 1.7rem;
  padding-bottom: 2.1rem;
  scroll-margin-top: 7rem;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62rem;
  width: 9px;
  height: 9px;
  transform: rotate(45deg);
  border: 1px solid var(--gold);
  background: var(--paper);
  z-index: 1;
}

.page-about .timeline__item::after {
  content: "";
  position: absolute;
  left: 4px;
  top: 1.15rem;
  bottom: .1rem;
  width: 1px;
  background: var(--gold-line);
}

.page-about .timeline__item:last-child::after {
  display: none;
}

.page-about .timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.25rem;
  letter-spacing: .06em;
  color: var(--copper);
  line-height: 1.1;
  margin-bottom: .4rem;
}

.page-about .timeline__title {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.1rem;
  line-height: 1.45;
  color: var(--green);
  margin: 0 0 .45rem;
}

.page-about .timeline__text {
  margin: 0;
  font-size: .93rem;
  line-height: 1.85;
}

.page-about .timeline__note {
  margin: .6rem 0 0;
  padding-left: .8rem;
  border-left: 2px solid var(--paper-2);
  font-family: var(--font-hand);
  font-size: .98rem;
  line-height: 1.6;
  color: var(--gray);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-team__figure {
  margin: 0;
  --media-ratio: 4 / 3;
  border: var(--about-line-strong);
}

.page-about .about-counts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  margin-top: 1.1rem;
  border: var(--about-line-strong);
  background: var(--paper-2);
}

.page-about .about-counts__cell {
  padding: .85rem .7rem;
  border-left: var(--about-line);
}

.page-about .about-counts__cell:first-child {
  border-left: 0;
}

.page-about .about-counts__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.45rem;
  line-height: 1.1;
  color: var(--green);
}

.page-about .about-counts__label {
  display: block;
  margin-top: .2rem;
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--gray);
}

.page-about .about-team__intro {
  margin: 0 0 1.4rem;
  font-size: .95rem;
  line-height: 1.85;
}

.page-about .role-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 2px solid var(--gold);
}

.page-about .role-list__item {
  display: grid;
  grid-template-columns: 2.1rem minmax(0, 1fr);
  gap: .85rem;
  padding-block: .95rem;
  border-bottom: var(--about-line);
}

.page-about .role-list__num {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .08em;
  color: var(--copper);
  padding-top: .25rem;
}

.page-about .role-list__name {
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1rem;
  line-height: 1.4;
  color: var(--green);
  margin: 0 0 .3rem;
}

.page-about .role-list__desc {
  margin: 0;
  font-size: .88rem;
  line-height: 1.72;
}

/* ---------- 权益理念 ---------- */
.page-about .about-benefit__lede {
  max-width: 62ch;
  margin: 0 0 1.6rem;
  font-size: .95rem;
  line-height: 1.85;
}

.page-about .tier-ladder {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: var(--about-line-strong);
}

.page-about .tier {
  display: grid;
  gap: .35rem;
  padding: 1rem 0;
  border-bottom: var(--about-line);
}

.page-about .tier__num {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .12em;
  color: var(--copper);
}

.page-about .tier__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: .06em;
  color: var(--green);
  margin: 0;
}

.page-about .tier__text {
  margin: 0;
  font-size: .9rem;
  line-height: 1.75;
}

.page-about .about-benefit__sub {
  margin: 2.25rem 0 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: 1.05rem;
  color: var(--green);
  padding-bottom: .6rem;
  border-bottom: var(--about-line-strong);
}

.page-about .notice-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: .7rem;
}

.page-about .notice {
  display: grid;
  grid-template-columns: 1.6rem minmax(0, 1fr);
  gap: .8rem;
  padding: .85rem .9rem;
  background: var(--cream);
  border: var(--about-line);
  border-left: 2px solid var(--red);
}

.page-about .notice__num {
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .1em;
  color: var(--red);
  padding-top: .15rem;
}

.page-about .notice__text {
  margin: 0;
  font-size: .88rem;
  line-height: 1.7;
}

.page-about .notice__text strong {
  font-weight: 600;
  color: var(--green);
}

.page-about .about-benefit__link {
  margin: 1.5rem 0 0;
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-partners__body p {
  margin: 0 0 1rem;
  font-size: .95rem;
  line-height: 1.85;
}

.page-about .seal-row {
  display: flex;
  flex-wrap: wrap;
  gap: .9rem;
  margin-top: 1.5rem;
}

.page-about .seal {
  position: relative;
  flex: 1 1 13rem;
  min-width: 0;
  padding: .9rem 1rem 1rem;
  border: 1px solid var(--red);
  background: rgba(164, 74, 50, .05);
  outline-offset: 3px;
}

.page-about .seal__mark {
  position: absolute;
  top: .85rem;
  right: .85rem;
  color: var(--red);
  opacity: .7;
}

.page-about .seal__year {
  display: block;
  font-family: var(--font-mono);
  font-size: .7rem;
  letter-spacing: .18em;
  color: var(--red);
  margin-bottom: .35rem;
}

.page-about .seal__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 600;
  font-size: .98rem;
  line-height: 1.5;
  color: var(--dark-red);
  padding-right: 2rem;
}

.page-about .seal__tip {
  margin: .55rem 0 0;
  font-size: .79rem;
  line-height: 1.65;
  color: var(--gray);
}

.page-about .about-partners__figure {
  margin: 0;
  --media-ratio: 9 / 7;
  border: var(--about-line-strong);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope__lede {
  max-width: 62ch;
  margin: 0;
  font-size: .95rem;
  line-height: 1.85;
}

.page-about .scope-grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1.1rem 1.25rem;
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: var(--about-line-strong);
}

.page-about .scope__num {
  display: block;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.85rem, 7vw, 2.7rem);
  line-height: 1;
  color: var(--green);
  letter-spacing: -.01em;
}

.page-about .scope__unit {
  font-size: .42em;
  font-weight: 700;
  margin-left: .12em;
  color: var(--copper);
}

.page-about .scope__label {
  display: block;
  margin-top: .5rem;
  font-size: .8rem;
  line-height: 1.55;
  color: var(--gray);
}

.page-about .about-scope__foot {
  margin: 1.75rem 0 0;
  max-width: 66ch;
  font-size: .92rem;
  line-height: 1.85;
  padding-left: 1rem;
  border-left: 2px solid var(--gold);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding-block: clamp(2.25rem, 6vw, 3.5rem);
}

.page-about .about-next__inner {
  display: grid;
  gap: 1.5rem;
  border-top: var(--about-line-strong);
  padding-top: 1.6rem;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(1.3rem, 4.4vw, 1.75rem);
  line-height: 1.35;
  color: var(--green);
  margin: .5rem 0 .55rem;
}

.page-about .about-next__text {
  margin: 0;
  max-width: 52ch;
  font-size: .9rem;
  line-height: 1.8;
  color: var(--gray);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: .65rem;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .scope-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .timeline__item {
    padding-left: 2.1rem;
    padding-bottom: 2.6rem;
  }
}

@media (min-width: 768px) {
  .page-about .seal__tip {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    margin-top: 0;
    transition: max-height .2s ease, opacity .2s ease, margin-top .2s ease;
  }

  .page-about .seal:hover .seal__tip,
  .page-about .seal:focus .seal__tip,
  .page-about .seal:focus-within .seal__tip {
    max-height: 7rem;
    opacity: 1;
    margin-top: .55rem;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 2rem;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(15rem, .85fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, .85fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: 3.5rem;
    align-items: start;
  }

  .page-about .year-index {
    position: sticky;
    top: 6.5rem;
  }

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

  .page-about .year-index__link {
    justify-content: flex-start;
    min-width: 0;
    padding: .5rem .6rem .5rem .8rem;
    border: 0;
    border-left: 1px solid var(--line);
    font-size: .82rem;
  }

  .page-about .year-index__link:hover,
  .page-about .year-index__link:focus-visible {
    background: transparent;
    border-left: 2px solid var(--red);
    color: var(--red);
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1.08fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    gap: 3rem;
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .tier {
    grid-template-columns: 3rem 6rem minmax(0, 1fr);
    gap: 1.25rem 1.5rem;
    align-items: baseline;
    padding-block: 1.15rem;
  }

  .page-about .tier:nth-child(2) {
    padding-left: 1.1rem;
  }

  .page-about .tier:nth-child(3) {
    padding-left: 2.2rem;
  }

  .page-about .tier:nth-child(4) {
    padding-left: 3.3rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .year-index__link,
  .page-about .seal__tip {
    transition: none;
  }
}