.page-about {
  background: var(--cg-paper);
  color: var(--cg-text);
  padding-bottom: 88px;
}

.page-about .cg-breadcrumb {
  padding-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: 20px;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 36px;
  align-items: start;
}

.page-about .about-hero__title {
  font-family: var(--cg-serif);
  font-weight: 300;
  font-size: clamp(34px, 7vw, 74px);
  line-height: 1.1;
  letter-spacing: 0.02em;
  color: var(--cg-ink);
  margin: 14px 0 20px;
}

.page-about .about-hero__lede {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--cg-text);
  margin: 0;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__visual {
  position: relative;
  overflow: hidden;
  background: var(--cg-ink);
  border-radius: 2px;
  padding: 30px 26px 26px;
  display: grid;
  gap: 26px;
  justify-items: start;
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(135deg, rgba(201, 162, 39, 0.14) 0 1px, transparent 1px 16px);
  pointer-events: none;
}

.page-about .about-seal {
  position: relative;
  width: 158px;
  height: 158px;
  border-radius: 50%;
  border: 1.5px solid var(--cg-gold);
  display: grid;
  place-content: center;
  justify-items: center;
  gap: 4px;
  background: radial-gradient(circle at 32% 26%, rgba(201, 162, 39, 0.22), transparent 64%);
  transition: transform 240ms var(--cg-ease);
}

.page-about .about-seal::after {
  content: "";
  position: absolute;
  inset: 11px;
  border-radius: 50%;
  border: 1px dashed rgba(201, 162, 39, 0.45);
}

.page-about .about-seal:hover {
  transform: rotate(8deg) scale(1.03);
}

.page-about .about-seal__num {
  font-family: var(--cg-serif);
  font-size: 46px;
  font-weight: 300;
  line-height: 1;
  color: var(--cg-gold-soft);
  letter-spacing: 0.06em;
}

.page-about .about-seal__label {
  font-family: var(--cg-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  color: rgba(232, 217, 168, 0.78);
}

.page-about .about-facts {
  width: 100%;
  margin: 0;
  position: relative;
}

.page-about .about-facts__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 10px 0;
  border-top: 1px solid rgba(201, 162, 39, 0.32);
}

.page-about .about-facts dt {
  font-family: var(--cg-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: rgba(232, 217, 168, 0.72);
  white-space: nowrap;
}

.page-about .about-facts dd {
  margin: 0;
  font-size: 14px;
  color: var(--cg-paper);
  text-align: right;
}

/* ---------- 版本刻度条 ---------- */
.page-about .about-scale {
  padding: 52px 0 12px;
}

.page-about .about-scale__head {
  font-family: var(--cg-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cg-jade-deep);
  margin: 0 0 16px;
}

.page-about .about-scale__rail {
  display: flex;
  border-top: 1px solid var(--cg-line);
}

.page-about .about-scale__tick {
  flex: 1 1 0;
  position: relative;
  padding-top: 16px;
  min-width: 0;
}

.page-about .about-scale__tick i {
  position: absolute;
  top: -1px;
  left: 0;
  width: 1px;
  height: 13px;
  background: var(--cg-line);
}

.page-about .about-scale__tick b {
  font-family: var(--cg-mono);
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--cg-text);
  opacity: 0.6;
}

.page-about .about-scale__tick.is-current i {
  width: 2px;
  height: 21px;
  top: -5px;
  background: var(--cg-vermilion);
}

.page-about .about-scale__tick.is-current b {
  color: var(--cg-vermilion);
  opacity: 1;
}

/* ---------- 首图 ---------- */
.page-about .about-plate {
  margin: 8px 0 0;
  aspect-ratio: 14 / 9;
  border-radius: 2px;
  overflow: hidden;
}

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

.page-about .cg-media__caption {
  font-family: var(--cg-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cg-text);
  opacity: 0.72;
  padding-top: 10px;
}

/* ---------- 正文骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 28px;
  padding-top: 56px;
  scroll-margin-top: calc(var(--cg-header-h) + 24px);
}

.page-about .about-years {
  border-top: 1px solid var(--cg-line);
  padding-top: 14px;
}

.page-about .about-years__label {
  font-family: var(--cg-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cg-jade-deep);
  margin: 0 0 12px;
}

.page-about .about-years__list {
  list-style: none;
  margin: 0;
  padding: 0 0 4px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-years__list li {
  flex: 0 0 auto;
}

.page-about .about-years__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  padding: 7px 12px;
  text-decoration: none;
  color: var(--cg-text);
  font-size: 13px;
  border: 1px solid var(--cg-line-ink);
  border-radius: 2px;
  white-space: nowrap;
  transition: background-color 200ms var(--cg-ease), border-color 200ms var(--cg-ease), color 200ms var(--cg-ease);
}

.page-about .about-years__list a span {
  font-family: var(--cg-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--cg-jade-deep);
}

.page-about .about-years__list a:hover {
  background: var(--cg-sand);
  border-color: var(--cg-gold);
  color: var(--cg-ink);
}

.page-about .about-sec {
  padding-top: 46px;
  scroll-margin-top: calc(var(--cg-header-h) + 24px);
}

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

.page-about .about-sec__num {
  font-family: var(--cg-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cg-vermilion);
  margin: 0;
}

.page-about .about-sec__title {
  font-family: var(--cg-serif);
  font-weight: 400;
  font-size: clamp(24px, 4vw, 38px);
  line-height: 1.26;
  color: var(--cg-ink);
  margin: 10px 0 18px;
  max-width: 22em;
}

.page-about .about-sec__p {
  max-width: 34em;
  font-size: 16px;
  line-height: 1.85;
  margin: 0 0 16px;
}

.page-about .about-sec__p--last {
  margin-top: 22px;
}

.page-about .about-mail,
.page-about .about-sec__p a {
  color: var(--cg-jade-deep);
  text-decoration: underline;
  text-decoration-color: var(--cg-line);
  text-underline-offset: 3px;
}

/* ---------- 索引卡引言 ---------- */
.page-about .about-card {
  position: relative;
  margin: 26px 0 0;
  padding: 24px 22px 32px;
  max-width: 40em;
  background-color: var(--cg-sand);
  background-image: repeating-linear-gradient(180deg, transparent 0 27px, rgba(22, 36, 61, 0.07) 27px 28px);
  border-left: 2px solid var(--cg-gold);
  border-radius: 2px;
}

.page-about .about-card__num {
  font-family: var(--cg-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--cg-jade-deep);
}

.page-about .about-card p {
  font-family: var(--cg-serif);
  font-size: 18px;
  line-height: 1.9;
  color: var(--cg-ink);
  margin: 10px 0 0;
}

.page-about .about-card__dot {
  position: absolute;
  right: 18px;
  bottom: 16px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--cg-gold);
}

/* ---------- 三层放法 ---------- */
.page-about .about-method {
  display: grid;
  gap: 26px;
  margin-top: 24px;
}

.page-about .about-square {
  margin: 0;
  aspect-ratio: 1 / 1;
  overflow: hidden;
  border-radius: 2px;
}

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

.page-about .about-rings {
  width: 100%;
  max-width: 230px;
  height: auto;
  display: block;
  margin: 0 auto 18px;
}

.page-about .about-fold {
  border-bottom: 1px solid var(--cg-line-ink);
}

.page-about .about-fold .cg-fold__head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 0;
  cursor: pointer;
}

.page-about .about-fold .cg-fold__num {
  flex: 0 0 auto;
  width: 24px;
  height: 24px;
  display: grid;
  place-items: center;
  font-family: var(--cg-mono);
  font-size: 11px;
  color: var(--cg-jade-deep);
  border: 1px solid var(--cg-jade);
  border-radius: 2px;
}

.page-about .about-fold__title {
  flex: 1 1 auto;
  font-size: 15px;
  font-weight: 500;
  color: var(--cg-ink);
  line-height: 1.5;
}

.page-about .about-fold .cg-fold__icon {
  flex: 0 0 auto;
  font-family: var(--cg-mono);
  font-size: 16px;
  color: var(--cg-gold);
}

.page-about .about-fold .cg-fold__panel p {
  margin: 0 0 18px;
  padding-left: 14px;
  border-left: 2px solid var(--cg-gold);
  font-size: 15px;
  line-height: 1.85;
  color: var(--cg-text);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-team__card {
  background: #fff;
  border-top: 2px solid var(--cg-jade);
  border-radius: 0 0 2px 2px;
  padding: 18px 18px 20px;
  transition: transform 220ms var(--cg-ease), border-color 220ms var(--cg-ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within {
  transform: translateY(-3px);
  border-top-color: var(--cg-gold);
}

.page-about .about-team__role {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team__name {
  font-family: var(--cg-serif);
  font-weight: 500;
  font-size: 19px;
  color: var(--cg-ink);
  margin: 0;
}

.page-about .about-team__num {
  font-family: var(--cg-mono);
  font-size: 22px;
  color: var(--cg-jade-deep);
  line-height: 1;
}

.page-about .about-team__num small {
  font-size: 10px;
  letter-spacing: 0.1em;
}

.page-about .about-team__duty {
  font-size: 14px;
  line-height: 1.8;
  color: var(--cg-text);
  margin: 10px 0 0;
}

.page-about .about-team__hover {
  font-family: var(--cg-mono);
  font-size: 10px;
  letter-spacing: 0.12em;
  color: var(--cg-vermilion);
  margin: 12px 0 0;
  opacity: 0;
  transform: translateY(4px);
  transition: opacity 220ms var(--cg-ease), transform 220ms var(--cg-ease);
}

.page-about .about-team__card:hover .about-team__hover,
.page-about .about-team__card:focus-within .about-team__hover {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 里程碑时间线 ---------- */
.page-about .about-line {
  list-style: none;
  margin: 26px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 14px;
  width: 1px;
  background: var(--cg-line);
}

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

.page-about .about-line__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--cg-paper);
  border: 1.5px solid var(--cg-gold);
}

.page-about .about-line__item.is-key::before {
  background: var(--cg-vermilion);
  border-color: var(--cg-vermilion);
}

.page-about .about-line__stage {
  font-family: var(--cg-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cg-jade-deep);
}

.page-about .about-line__item.is-key .about-line__stage {
  color: var(--cg-vermilion);
}

.page-about .about-line__title {
  font-family: var(--cg-serif);
  font-weight: 500;
  font-size: 18px;
  line-height: 1.5;
  color: var(--cg-ink);
  margin: 6px 0 6px;
}

.page-about .about-line__text {
  font-size: 15px;
  line-height: 1.8;
  margin: 0;
  max-width: 32em;
}

.page-about .about-wide {
  margin: 22px 0 0;
  aspect-ratio: 3 / 2;
  overflow: hidden;
  border-radius: 2px;
}

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

/* ---------- 调研 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 22px 0 24px;
  padding: 0;
  display: grid;
  gap: 0;
  border-top: 1px solid var(--cg-line);
}

.page-about .about-stats__item {
  display: grid;
  gap: 4px;
  padding: 16px 0;
  border-bottom: 1px solid var(--cg-line-ink);
}

.page-about .about-stats__num {
  font-family: var(--cg-serif);
  font-size: 22px;
  font-weight: 500;
  color: var(--cg-ink);
  letter-spacing: 0.01em;
}

.page-about .about-stats__text {
  font-size: 14px;
  line-height: 1.75;
  color: var(--cg-text);
}

/* ---------- 合作入口 ---------- */
.page-about .about-links {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
}

.page-about .about-link {
  display: grid;
  gap: 6px;
  padding: 18px 18px 20px;
  text-decoration: none;
  background: var(--cg-sand);
  border-left: 2px solid var(--cg-jade);
  border-radius: 2px;
  transition: background-color 220ms var(--cg-ease), border-color 220ms var(--cg-ease);
}

.page-about .about-link:hover {
  background: #fff;
  border-left-color: var(--cg-gold);
}

.page-about .about-link__k {
  font-family: var(--cg-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cg-jade-deep);
}

.page-about .about-link__t {
  font-size: 15px;
  line-height: 1.7;
  color: var(--cg-ink);
}

.page-about .about-back {
  margin: 30px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--cg-line-ink);
}

.page-about .about-back a {
  font-family: var(--cg-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cg-jade-deep);
  text-decoration: none;
}

.page-about .about-back a:hover {
  color: var(--cg-vermilion);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    column-gap: 24px;
    border-bottom: 1px solid var(--cg-line-ink);
  }

  .page-about .about-stats__item {
    border-bottom: none;
    padding: 18px 0;
  }

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

  .page-about .about-team {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    column-gap: 14px;
  }

  .page-about .about-team__card:nth-child(1) {
    grid-column: 1 / span 4;
  }

  .page-about .about-team__card:nth-child(2) {
    grid-column: 5 / span 2;
    margin-top: 34px;
  }

  .page-about .about-team__card:nth-child(3) {
    grid-column: 1 / span 2;
    margin-top: -16px;
  }

  .page-about .about-team__card:nth-child(4) {
    grid-column: 3 / span 4;
    margin-top: 12px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 54px;
  }

  .page-about .about-hero__visual {
    margin-top: 12px;
  }

  .page-about .about-body {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 56px;
    padding-top: 72px;
  }

  .page-about .about-years {
    position: sticky;
    top: calc(var(--cg-header-h) + 24px);
    align-self: start;
  }

  .page-about .about-years__list {
    display: block;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-years__list li + li {
    margin-top: 2px;
  }

  .page-about .about-years__list a {
    display: flex;
    border-color: transparent;
    padding: 8px 10px;
    font-size: 14px;
  }

  .page-about .about-years__list a:hover {
    border-color: var(--cg-line-ink);
  }

  .page-about .about-method {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-rings {
    margin-left: 0;
  }

  .page-about .about-sec__p {
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-seal,
  .page-about .about-seal:hover,
  .page-about .about-team__card,
  .page-about .about-team__card:hover,
  .page-about .about-team__hover,
  .page-about .about-link,
  .page-about .about-years__list a {
    transition-duration: 0.01ms;
    transform: none;
  }
}