.page-about {
  --tl-year-col: 3.4rem;
  --tl-axis-col: 2.5rem;
  --tl-gap: 0.8rem;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding: 1.2rem 0 0.2rem;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.45rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 0.82rem;
  color: var(--muted);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--gold-deep);
  opacity: 0.6;
}

.page-about .breadcrumb__item a {
  color: var(--emerald-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--t-fast) var(--ease), color var(--t-fast) var(--ease);
}

.page-about .breadcrumb__item a:hover {
  color: var(--gold-deep);
  border-bottom-color: var(--line-gold);
}

/* ---------- 封面 ---------- */
.page-about .cover {
  padding: 1.4rem 0 0;
}

.page-about .cover__title {
  margin: 0.55rem 0 1.05rem;
  font-size: clamp(1.85rem, 3.4vw + 0.9rem, 3.25rem);
  line-height: 1.18;
  letter-spacing: 0.01em;
  max-width: 22em;
}

.page-about .cover__lede {
  margin: 0;
  max-width: 46rem;
  font-size: clamp(1rem, 0.35vw + 0.94rem, 1.1rem);
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .cover__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 1.9rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--cream-2);
  border: 1px solid var(--line-gold);
}

.page-about .cover__stat {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.95rem 1rem 1.05rem;
  background: var(--paper);
}

.page-about .cover__stat-num {
  font-family: var(--font-mono);
  font-size: 1.62rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--emerald-700);
  letter-spacing: 0.01em;
}

.page-about .cover__stat-label {
  font-size: 0.8rem;
  line-height: 1.55;
  color: var(--muted);
}

.page-about .cover__banner {
  margin-top: 1.9rem;
  overflow: hidden;
  border-top: 1px solid var(--line-gold);
  border-bottom: 1px solid var(--line-gold);
}

.page-about .cover__banner img {
  display: block;
  width: 100%;
  height: clamp(180px, 33vw, 400px);
  max-width: 100%;
  object-fit: cover;
}

/* ---------- 通用小节头部微调 ---------- */
.page-about .section__head {
  margin-bottom: 1.6rem;
}

.page-about .section__head--split {
  display: grid;
  gap: 0.85rem;
}

.page-about .section__note {
  margin: 0;
  padding-left: 0.85rem;
  border-left: 2px solid var(--gold);
  font-size: 0.85rem;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .timeline-section {
  padding-top: clamp(2.4rem, 5vw, 4rem);
}

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

.page-about .tl__item {
  position: relative;
  display: grid;
  grid-template-columns: var(--tl-year-col) var(--tl-axis-col) minmax(0, 1fr);
  column-gap: var(--tl-gap);
  padding-bottom: 1.5rem;
}

.page-about .tl__year {
  padding-top: 0.15rem;
  text-align: right;
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  line-height: 1.25;
  color: var(--muted);
  transition: color var(--t-fast) var(--ease);
}

.page-about .tl__item--now .tl__year {
  color: var(--red);
  font-weight: 700;
}

.page-about .tl__axis {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: flex-start;
}

.page-about .tl__axis::before {
  content: "";
  position: absolute;
  top: 0.95rem;
  bottom: -1.5rem;
  left: 50%;
  width: 1px;
  transform: translateX(-50%);
  background: linear-gradient(to bottom, var(--line-gold), rgba(201, 162, 39, 0.12));
}

.page-about .tl__item:last-child .tl__axis::before {
  bottom: 0.5rem;
}

.page-about .tl__chip {
  position: relative;
  z-index: 1;
  display: block;
  width: 2.5rem;
  height: 2.5rem;
  transition: transform var(--t-mid) var(--ease), filter var(--t-mid) var(--ease);
}

.page-about .tl__chip svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about .tl__item:hover .tl__chip,
.page-about .tl__item:focus-within .tl__chip {
  transform: translateY(-3px) scale(1.05);
  filter: drop-shadow(0 4px 10px rgba(201, 162, 39, 0.34));
}

.page-about .tl__body {
  min-width: 0;
  padding: 0.9rem 1rem 1rem;
  background: var(--paper);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--line-gold);
  transition: border-left-color var(--t-fast) var(--ease),
              box-shadow var(--t-mid) var(--ease),
              transform var(--t-mid) var(--ease);
}

.page-about .tl__item:hover .tl__body,
.page-about .tl__item:focus-within .tl__body {
  border-left-color: var(--gold);
  box-shadow: var(--shadow-card);
  transform: translateY(-2px);
}

.page-about .tl__item--now .tl__body {
  border-left-color: var(--red);
}

.page-about .tl__kicker {
  margin: 0 0 0.28rem;
  font-size: 0.73rem;
  letter-spacing: 0.14em;
  color: var(--gold-deep);
}

.page-about .tl__item--now .tl__kicker {
  color: var(--red);
  font-weight: 600;
}

.page-about .tl__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-display);
  font-size: 1.14rem;
  font-weight: 700;
  line-height: 1.42;
  color: var(--ink);
}

.page-about .tl__text {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .tl__text a {
  color: var(--emerald-700);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .tl__text a:hover {
  color: var(--gold-deep);
  border-bottom-color: var(--gold);
}

.page-about .tl__branch {
  display: flex;
  align-items: center;
  gap: 0.45rem;
  margin: 0.7rem 0 0;
  padding-top: 0.6rem;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.77rem;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .tl__more {
  margin: 0.6rem 0 0;
  padding-left: 0.7rem;
  border-left: 2px solid var(--line-gold);
  font-size: 0.85rem;
  line-height: 1.78;
  color: var(--emerald-700);
}

@media (hover: hover) and (min-width: 760px) {
  .page-about .tl__more {
    max-height: 0;
    margin-top: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height var(--t-mid) var(--ease),
                opacity var(--t-mid) var(--ease),
                margin-top var(--t-mid) var(--ease);
  }

  .page-about .tl__item:hover .tl__more,
  .page-about .tl__item:focus-within .tl__more {
    max-height: 9rem;
    margin-top: 0.6rem;
    opacity: 1;
  }
}

/* ---------- 版本对照表 ---------- */
.page-about .version-table-section {
  padding-top: clamp(2rem, 4vw, 3.2rem);
}

.page-about .vtable__scroll {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--line-gold);
  background: var(--paper);
}

.page-about .vtable {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 0.9rem;
}

.page-about .vtable thead th {
  padding: 0.78rem 1rem;
  background: var(--gold);
  color: var(--ink);
  font-family: var(--font-body);
  font-size: 0.83rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-align: left;
  white-space: nowrap;
  border-bottom: 1px solid var(--gold-deep);
}

.page-about .vtable tbody th {
  padding: 0.85rem 1rem;
  font-family: var(--font-mono);
  font-size: 0.86rem;
  font-weight: 700;
  color: var(--emerald-700);
  text-align: left;
  white-space: nowrap;
  vertical-align: top;
  border-top: 1px solid var(--line-soft);
}

.page-about .vtable tbody td {
  padding: 0.85rem 1rem;
  color: var(--ink-soft);
  line-height: 1.68;
  vertical-align: top;
  border-top: 1px solid var(--line-soft);
}

.page-about .vtable tbody tr:nth-child(even) {
  background: var(--cream-2);
}

/* ---------- 六个常设栏目 ---------- */
.page-about .topic-accum {
  padding-top: clamp(2.2rem, 4.5vw, 3.4rem);
}

.page-about .topic-accum__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-gold);
  border: 1px solid var(--line-gold);
}

.page-about .topic-accum__item {
  padding: 1.1rem 1.1rem 1.25rem;
  background: var(--paper);
  transition: background var(--t-fast) var(--ease);
}

.page-about .topic-accum__item:hover {
  background: var(--cream);
}

.page-about .topic-accum__num {
  display: inline-block;
  margin-bottom: 0.55rem;
  padding-bottom: 0.14rem;
  border-bottom: 1px solid var(--line-gold);
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.1em;
  color: var(--gold-deep);
  transition: transform var(--t-fast) var(--ease);
}

.page-about .topic-accum__item:hover .topic-accum__num {
  transform: translateX(6px);
}

.page-about .topic-accum__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .topic-accum__text {
  margin: 0;
  font-size: 0.89rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 编辑团队横向主题带 ---------- */
.page-about .team-band {
  padding-top: clamp(2.4rem, 5vw, 4rem);
  padding-bottom: clamp(2.4rem, 5vw, 4rem);
}

.page-about .team-band .section__title {
  color: var(--gold-soft);
}

@supports ((-webkit-background-clip: text) or (background-clip: text)) {
  .page-about .team-band .section__title {
    background: linear-gradient(180deg, var(--gold-soft), var(--gold));
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
  }
}

.page-about .team-band__lede {
  margin: 0.75rem 0 0;
  max-width: 44rem;
  font-size: 0.96rem;
  line-height: 1.85;
  color: rgba(245, 239, 226, 0.76);
}

.page-about .team-band__grid {
  display: grid;
  gap: 1.9rem;
  margin-top: 1.6rem;
}

.page-about .team-band .accordion__item {
  border-bottom: 1px solid rgba(201, 162, 39, 0.26);
}

.page-about .team-band .accordion__item:first-child {
  border-top: 1px solid rgba(201, 162, 39, 0.26);
}

.page-about .team-band .accordion__trigger {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  width: 100%;
  padding: 0.95rem 0.2rem;
  background: transparent;
  border: 0;
  color: var(--cream);
  font-family: var(--font-body);
  font-size: 1rem;
  text-align: left;
  cursor: pointer;
  transition: color var(--t-fast) var(--ease), padding-left var(--t-fast) var(--ease);
}

.page-about .team-band .accordion__trigger:hover {
  color: var(--gold-soft);
  padding-left: 0.6rem;
}

.page-about .team-band .accordion__trigger:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: 3px;
}

.page-about .team-band .accordion__icon {
  flex: 0 0 auto;
  align-self: center;
  width: 0.52rem;
  height: 0.52rem;
  border-right: 1px solid var(--gold);
  border-bottom: 1px solid var(--gold);
  transform: rotate(45deg);
  transition: transform var(--t-mid) var(--ease);
}

.page-about .team-band .accordion__trigger[aria-expanded="false"] .accordion__icon {
  transform: rotate(-45deg);
}

.page-about .team-acc__label {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .team-acc__hint {
  margin-left: auto;
  font-size: 0.79rem;
  color: rgba(231, 206, 122, 0.72);
  white-space: nowrap;
}

.page-about .team-band .accordion__panel {
  padding: 0 0.2rem 1.1rem 1.35rem;
}

.page-about .team-band .accordion__panel p {
  margin: 0;
  font-size: 0.91rem;
  line-height: 1.85;
  color: rgba(245, 239, 226, 0.78);
}

.page-about .team-band__figure {
  margin: 0;
}

.page-about .team-band__figure .figure__media {
  border: 1px solid rgba(201, 162, 39, 0.35);
}

.page-about .team-band__figure .figure__caption {
  margin-top: 0.6rem;
  font-size: 0.78rem;
  line-height: 1.6;
  color: rgba(245, 239, 226, 0.58);
}

/* ---------- 本地栏目归档 ---------- */
.page-about .archive-section {
  padding-top: clamp(2.4rem, 5vw, 3.8rem);
  padding-bottom: clamp(2.4rem, 5vw, 3.8rem);
}

.page-about .archive__grid {
  display: grid;
  gap: 1.7rem;
}

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

.page-about .archive__lede {
  margin: 0.7rem 0 0;
  font-size: 0.96rem;
  line-height: 1.88;
  color: var(--ink-soft);
}

.page-about .archive__list {
  display: grid;
  gap: 0.7rem;
  margin: 1.15rem 0 0;
  padding: 0;
  list-style: none;
}

.page-about .archive__list li {
  position: relative;
  padding-left: 1.4rem;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--ink-soft);
}

.page-about .archive__list li::before {
  content: "";
  position: absolute;
  left: 0.15rem;
  top: 0.62rem;
  width: 0.48rem;
  height: 0.48rem;
  background: var(--gold);
  transform: rotate(45deg);
}

.page-about .archive__foot {
  margin: 1.15rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line-gold);
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .archive__foot a {
  color: var(--emerald-700);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: color var(--t-fast) var(--ease), border-color var(--t-fast) var(--ease);
}

.page-about .archive__foot a:hover {
  color: var(--gold-deep);
  border-bottom-color: var(--gold);
}

/* ---------- 两张信息卡 ---------- */
.page-about .certcards-section {
  padding-top: clamp(2.2rem, 4.5vw, 3.4rem);
  padding-bottom: clamp(2.2rem, 4.5vw, 3.4rem);
}

.page-about .certcards {
  display: grid;
  gap: 1.2rem;
}

.page-about .certcard {
  display: flex;
  flex-direction: column;
  padding: 1.35rem 1.3rem 1.45rem;
  background: var(--paper);
  border: 1px solid var(--line-gold);
  border-top: 3px solid var(--gold);
  transition: transform var(--t-mid) var(--ease), box-shadow var(--t-mid) var(--ease);
}

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

.page-about .certcard__title {
  margin: 0.45rem 0 0.7rem;
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 700;
  line-height: 1.44;
  color: var(--ink);
}

.page-about .certcard__text {
  margin: 0 0 0.7rem;
  font-size: 0.92rem;
  line-height: 1.82;
  color: var(--ink-soft);
}

.page-about .certcard__text--small {
  margin-top: auto;
  margin-bottom: 0;
  font-size: 0.84rem;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .certcard__text a {
  color: var(--emerald-700);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--line-gold);
  transition: color var(--t-fast) var(--ease), border-bottom-color var(--t-fast) var(--ease);
}

.page-about .certcard__text a:hover {
  color: var(--gold-deep);
  border-bottom-color: var(--gold);
}

.page-about .certcard__icp {
  margin: 0.2rem 0 0.9rem;
  padding: 0.7rem 0.9rem;
  background: var(--cream);
  border-left: 3px solid var(--gold);
  font-family: var(--font-mono);
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--emerald-700);
  overflow-wrap: anywhere;
}

.page-about .certcard__big {
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
  margin: 0 0 0.75rem;
  font-family: var(--font-mono);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--emerald-700);
}

.page-about .certcard__big-unit {
  font-family: var(--font-body);
  font-size: 0.88rem;
  font-weight: 500;
  color: var(--muted);
}

/* ---------- 相关栏目 ---------- */
.page-about .history-next {
  padding-bottom: clamp(2.6rem, 5vw, 4rem);
}

.page-about .history-next__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 1.2rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
}

.page-about .history-next__list li {
  background: var(--paper);
}

.page-about .history-next__list a {
  display: block;
  height: 100%;
  padding: 1rem 1.1rem 1.1rem;
  text-decoration: none;
  color: var(--ink);
  border-left: 2px solid transparent;
  transition: background var(--t-fast) var(--ease),
              border-left-color var(--t-fast) var(--ease),
              padding-left var(--t-fast) var(--ease);
}

.page-about .history-next__list a:hover,
.page-about .history-next__list a:focus-visible {
  background: var(--cream);
  border-left-color: var(--gold);
  padding-left: 1.4rem;
}

.page-about .history-next__list a:focus-visible {
  outline: 3px solid var(--gold);
  outline-offset: -3px;
}

.page-about .history-next__list strong {
  display: block;
  margin-bottom: 0.3rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--emerald-700);
}

.page-about .history-next__list span {
  display: block;
  font-size: 0.83rem;
  line-height: 1.66;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .cover__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 860px) {
  .page-about .section__head--split {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 0.65fr);
    align-items: end;
    gap: 2rem;
  }

  .page-about {
    --tl-year-col: 4.2rem;
    --tl-axis-col: 3rem;
    --tl-gap: 1.1rem;
  }

  .page-about .tl__chip {
    width: 2.75rem;
    height: 2.75rem;
  }

  .page-about .certcards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.4rem;
  }
}

@media (min-width: 940px) {
  .page-about .team-band__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .archive__grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    gap: 2.8rem;
    align-items: center;
  }
}

@media (min-width: 1040px) {
  .page-about .topic-accum__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .history-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (max-width: 560px) {
  .page-about {
    --tl-year-col: 2.85rem;
    --tl-axis-col: 2.1rem;
    --tl-gap: 0.55rem;
  }

  .page-about .tl__chip {
    width: 2.05rem;
    height: 2.05rem;
  }

  .page-about .tl__body {
    padding: 0.8rem 0.85rem 0.9rem;
  }

  .page-about .tl__title {
    font-size: 1.04rem;
  }

  .page-about .team-acc__hint {
    display: none;
  }

  .page-about .certcard__big {
    font-size: 2.1rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__chip,
  .page-about .tl__body,
  .page-about .tl__more,
  .page-about .topic-accum__num,
  .page-about .certcard,
  .page-about .history-next__list a {
    transition: none;
  }

  .page-about .tl__item:hover .tl__chip,
  .page-about .tl__item:focus-within .tl__chip,
  .page-about .tl__item:hover .tl__body,
  .page-about .tl__item:focus-within .tl__body,
  .page-about .certcard:hover {
    transform: none;
  }
}