.page-about {
  --about-index-w: 208px;
  --about-gap: clamp(1.5rem, 3vw, 3.25rem);
  --about-paper: rgba(18, 59, 50, 0.62);
  background: var(--ink);
  color: var(--ivory);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  padding-top: calc(var(--header-h) + 1rem);
  padding-bottom: 0.5rem;
  background: linear-gradient(180deg, var(--haze-a), rgba(36, 58, 61, 0));
}
.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--warm-gray);
}
.page-about .breadcrumb__list li + li::before {
  content: "/";
  margin-right: 0.4rem;
  color: var(--line);
}
.page-about .breadcrumb__list a {
  color: var(--warm-gray);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .breadcrumb__list a:hover {
  color: var(--gold-bright);
  border-bottom-color: var(--gold);
}
.page-about .breadcrumb__list [aria-current="page"] {
  color: var(--gold);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  margin-top: -3.5rem;
  padding: calc(var(--header-h) + 3.5rem) 0 clamp(2.5rem, 6vw, 4.5rem);
  background:
    radial-gradient(900px 420px at 82% 6%, rgba(201, 162, 75, 0.20), transparent 64%),
    radial-gradient(620px 380px at 8% 92%, rgba(47, 211, 179, 0.10), transparent 70%),
    linear-gradient(168deg, var(--haze-a) 0%, #17332e 44%, var(--ink) 100%);
  border-bottom: 1px solid var(--line);
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: auto 0 0 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--gold), transparent);
  opacity: 0.5;
}
.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  align-items: start;
}
.page-about .about-kicker {
  margin: 0 0 1rem;
  font-size: 0.72rem;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--gold);
}
.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(1.9rem, 6.2vw, 3.4rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--ivory);
}
.page-about .about-hero h1::after {
  content: "";
  display: block;
  width: 68px;
  height: 2px;
  margin-top: 1.1rem;
  background: linear-gradient(90deg, var(--gold), rgba(201, 162, 75, 0));
}
.page-about .about-hero__text {
  max-width: 40rem;
  margin: 1.15rem 0 0;
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(242, 234, 219, 0.82);
}
.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.75rem;
}

/* 档案速览卡 */
.page-about .about-idcard {
  position: relative;
  padding: 1.3rem 1.25rem 1.1rem;
  background:
    linear-gradient(160deg, rgba(18, 59, 50, 0.94), rgba(7, 26, 22, 0.94));
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
  box-shadow: var(--shadow-soft);
}
.page-about .about-idcard__title {
  margin: 0 0 0.9rem;
  font-size: 0.7rem;
  letter-spacing: 0.2em;
  color: var(--gold-bright);
}
.page-about .about-idcard__lines {
  display: grid;
  gap: 0.55rem;
  margin: 0;
}
.page-about .about-idcard__lines .dossier-lines__item {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 0.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 1px dashed var(--line-soft);
}
.page-about .about-idcard__lines .dossier-lines__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .dossier-lines__label {
  font-size: 0.78rem;
  color: var(--warm-gray);
  letter-spacing: 0.04em;
}
.page-about .dossier-lines__value {
  margin: 0;
  font-size: 0.86rem;
  color: var(--ivory);
  text-align: right;
}
.page-about .about-idcard__foot {
  margin: 1rem 0 0;
  padding-top: 0.85rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.78rem;
  line-height: 1.7;
  color: var(--warm-gray);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.85fr);
    align-items: start;
  }
  .page-about .about-idcard {
    margin-top: 0.75rem;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(1.5rem, 3vw, 2.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

/* 章节索引：移动端横向吸顶 */
.page-about .about-index {
  position: sticky;
  top: var(--header-h);
  z-index: 6;
  padding: 0.55rem 0 0.45rem;
  background: rgba(11, 43, 36, 0.94);
  backdrop-filter: blur(8px);
  border-bottom: 1px solid var(--line-soft);
}
.page-about .about-index__title {
  margin: 0 0 0.4rem;
  font-size: 0.66rem;
  letter-spacing: 0.22em;
  color: var(--gold);
}
.page-about .about-index__list {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0 0 0.15rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}
.page-about .about-index__link {
  display: block;
  white-space: nowrap;
  padding: 0.32rem 0.6rem;
  font-size: 0.72rem;
  color: var(--warm-gray);
  text-decoration: none;
  border: 1px solid var(--line-soft);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}
.page-about .about-index__link:hover {
  color: var(--gold-bright);
  border-color: var(--line);
}
.page-about .about-index__link[aria-current="true"] {
  color: var(--ink-deep);
  background: var(--gold);
  border-color: var(--gold);
}

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    padding: 0 0 0 0.9rem;
    background: transparent;
    backdrop-filter: none;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
  }
  .page-about .about-index__list {
    flex-direction: column;
    gap: 0.15rem;
    overflow: visible;
  }
  .page-about .about-index__link {
    padding: 0.4rem 0.5rem;
    border: 0;
    border-left: 2px solid transparent;
    margin-left: -2px;
    white-space: normal;
  }
  .page-about .about-index__link[aria-current="true"] {
    color: var(--gold-bright);
    background: transparent;
    border-left-color: var(--gold);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  position: relative;
  padding: clamp(1.75rem, 4vw, 2.75rem) 0;
  border-top: 1px solid var(--line-soft);
}
.page-about .about-chapter:first-child {
  border-top: 0;
  padding-top: 0.5rem;
}
.page-about .about-chapter__head {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  margin-bottom: 1.1rem;
}
.page-about .about-chapter__num {
  font-size: 0.78rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .about-chapter h2 {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 600;
  font-size: clamp(1.35rem, 4.4vw, 2rem);
  line-height: 1.35;
  color: var(--ivory);
}
.page-about .about-chapter__prose {
  max-width: 42em;
}
.page-about .about-chapter__prose p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.9;
  color: rgba(242, 234, 219, 0.78);
}
.page-about .about-chapter__prose p:last-child {
  margin-bottom: 0;
}
.page-about .about-chapter a {
  color: var(--gold-bright);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 75, 0.45);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}
.page-about .about-chapter a:hover {
  color: var(--gold);
  border-bottom-color: var(--gold-bright);
}

/* 纵向注释 */
.page-about .vertical-note {
  display: none;
  position: absolute;
  left: -2.6rem;
  top: 2.4rem;
  transform: rotate(180deg);
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.3em;
  color: rgba(201, 162, 75, 0.6);
}
@media (min-width: 1180px) {
  .page-about .vertical-note {
    display: block;
  }
}

/* ---------- 统计条 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 0.75rem;
  margin: 1.6rem 0 0;
  padding: 0;
  list-style: none;
}
.page-about .about-stats__item {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.8rem 0.95rem;
  background: var(--about-paper);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.page-about .about-stats__item:hover {
  transform: translateY(-2px);
  border-color: var(--line);
  box-shadow: var(--shadow-soft);
}
.page-about .about-stats__num {
  font-size: 1.35rem;
  color: var(--gold-bright);
  line-height: 1;
}
.page-about .about-stats__label {
  font-size: 0.82rem;
  color: var(--warm-gray);
}
@media (min-width: 720px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-stats__item {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.35rem;
  }
}

/* ---------- 图片容器 ---------- */
.page-about .media-frame {
  position: relative;
  margin: 1.6rem 0 0;
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--ink-2);
}
.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .media-frame--wide img {
  aspect-ratio: 2 / 1;
}
.page-about .about-map__cap {
  position: absolute;
  left: 0.75rem;
  bottom: 0.65rem;
  padding: 0.2rem 0.5rem;
  font-size: 0.64rem;
  letter-spacing: 0.18em;
  color: var(--gold-bright);
  background: rgba(7, 26, 22, 0.78);
  border: 1px solid var(--line);
}

/* ---------- 主题簇 ---------- */
.page-about .about-clusters {
  margin-top: 1.5rem;
}
.page-about .about-cluster {
  padding: 1.1rem 1.15rem 1rem;
  background: linear-gradient(155deg, rgba(18, 59, 50, 0.66), rgba(11, 43, 36, 0.66));
  border: 1px solid var(--line-soft);
  border-top: 1px solid var(--line);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .about-cluster:hover {
  transform: translateY(-3px);
  border-color: var(--line);
  box-shadow: var(--shadow-lift);
}
.page-about .about-cluster__num {
  display: block;
  font-size: 0.68rem;
  letter-spacing: 0.2em;
  color: var(--gold);
  margin-bottom: 0.5rem;
}
.page-about .about-cluster h3 {
  margin: 0 0 0.55rem;
  font-family: var(--font-serif);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--ivory);
}
.page-about .about-cluster p {
  margin: 0 0 0.7rem;
  font-size: 0.86rem;
  line-height: 1.85;
  color: rgba(242, 234, 219, 0.74);
}
.page-about .about-cluster__link {
  margin: 0 !important;
  font-family: var(--font-mono);
  font-size: 0.75rem !important;
}
.page-about .about-cluster__link a {
  border-bottom: 0;
}

/* ---------- 时间线卷轴 ---------- */
.page-about .about-timeline-visual {
  margin-top: 1.2rem;
}
.page-about .about-timeline-visual img {
  aspect-ratio: 24 / 7;
}
.page-about .about-timeline {
  display: flex;
  gap: 0.9rem;
  margin-top: 1.2rem;
  padding: 0.25rem 0 0.9rem;
  overflow-x: auto;
  scroll-snap-type: x mandatory;
  scrollbar-width: thin;
  scrollbar-color: var(--line) transparent;
}
.page-about .about-milestone {
  flex: 0 0 min(82%, 300px);
  scroll-snap-align: start;
  background: rgba(7, 26, 22, 0.72);
  border: 1px solid var(--line-soft);
  border-left: 2px solid var(--gold);
  padding: 0.85rem 1rem 0.95rem;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}
.page-about .about-milestone[open] {
  background: rgba(18, 59, 50, 0.8);
  border-color: var(--line);
}
.page-about .about-milestone summary {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  cursor: pointer;
  list-style: none;
}
.page-about .about-milestone summary::-webkit-details-marker {
  display: none;
}
.page-about .about-milestone summary::after {
  content: "展开 +";
  align-self: flex-start;
  margin-top: 0.35rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--electric);
}
.page-about .about-milestone[open] summary::after {
  content: "收起 −";
}
.page-about .about-milestone__year {
  font-size: 1.15rem;
  color: var(--gold-bright);
  line-height: 1.2;
}
.page-about .about-milestone__name {
  font-family: var(--font-serif);
  font-size: 0.98rem;
  color: var(--ivory);
}
.page-about .about-milestone p {
  margin: 0.7rem 0 0;
  padding-top: 0.7rem;
  border-top: 1px dashed var(--line-soft);
  font-size: 0.83rem;
  line-height: 1.8;
  color: rgba(242, 234, 219, 0.72);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 1.25rem;
  margin-top: 1.5rem;
  padding: 1.2rem 1.1rem;
  background:
    radial-gradient(420px 240px at 22% 18%, rgba(47, 211, 179, 0.08), transparent 70%),
    var(--about-paper);
  border: 1px solid var(--line-soft);
}
.page-about .about-team__ring {
  display: flex;
  justify-content: center;
}
.page-about .about-ring__svg {
  width: min(240px, 62vw);
  height: auto;
}
.page-about .about-team__legend {
  display: grid;
  gap: 0.7rem;
  margin: 0;
  padding: 0;
  list-style: none;
}
.page-about .about-team__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 0.15rem 0.7rem;
  padding: 0.7rem 0.8rem;
  background: rgba(7, 26, 22, 0.55);
  border: 1px solid var(--line-soft);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}
.page-about .about-team__item:hover {
  transform: translateX(3px);
  border-color: var(--line);
}
.page-about .about-team__count {
  grid-row: span 2;
  align-self: center;
  font-size: 1.5rem;
  line-height: 1;
}
.page-about .about-team__item--editor .about-team__count { color: var(--gold-bright); }
.page-about .about-team__item--tech .about-team__count { color: var(--electric); }
.page-about .about-team__item--research .about-team__count { color: var(--cinnabar); }
.page-about .about-team__role {
  font-family: var(--font-serif);
  font-size: 0.95rem;
  color: var(--ivory);
}
.page-about .about-team__desc {
  font-size: 0.8rem;
  line-height: 1.75;
  color: var(--warm-gray);
}
.page-about .about-team-visual {
  margin-top: 1.2rem;
}
.page-about .about-team-visual img {
  aspect-ratio: 4 / 3;
}
@media (min-width: 820px) {
  .page-about .about-team {
    grid-template-columns: 240px minmax(0, 1fr);
    align-items: center;
    padding: 1.5rem;
  }
  .page-about .about-team-visual img {
    aspect-ratio: 21 / 8;
  }
}

/* ---------- 标签与模板 ---------- */
.page-about .about-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1.3rem 0 1.6rem;
  padding: 0;
  list-style: none;
}
.page-about .about-templates {
  gap: 0.9rem;
}
.page-about .about-template {
  padding: 1rem 1.05rem;
  background: linear-gradient(150deg, rgba(18, 59, 50, 0.7), rgba(7, 26, 22, 0.7));
  border: 1px solid var(--line-soft);
  transition: transform 0.25s var(--ease), box-shadow 0.25s var(--ease);
}
.page-about .about-template:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-lift);
}
.page-about .about-template__no {
  margin: 0 0 0.5rem;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--gold);
}
.page-about .about-template h3 {
  margin: 0 0 0.45rem;
  font-family: var(--font-serif);
  font-size: 1rem;
  font-weight: 600;
  color: var(--ivory);
}
.page-about .about-template p {
  margin: 0;
  font-size: 0.82rem;
  line-height: 1.8;
  color: rgba(242, 234, 219, 0.72);
}

/* ---------- 交流 ---------- */
.page-about .about-exchange {
  display: grid;
  gap: 0.6rem;
  margin-top: 1.4rem;
}
.page-about .about-exchange__item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin: 0;
  padding: 0.7rem 0.9rem;
  font-size: 0.85rem;
  color: rgba(242, 234, 219, 0.8);
  background: rgba(18, 59, 50, 0.5);
  border-left: 2px solid var(--electric);
}
.page-about .about-exchange__item .mono {
  font-size: 1.15rem;
  color: var(--electric);
  line-height: 1;
}
.page-about .about-exchange__more {
  margin: 1.1rem 0 0;
  font-size: 0.86rem;
  line-height: 1.85;
  color: var(--warm-gray);
}
@media (min-width: 760px) {
  .page-about .about-exchange {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about .about-exchange__item {
    flex-direction: column;
    gap: 0.3rem;
  }
}

/* ---------- 联系 ---------- */
.page-about .about-chapter--contact {
  border-top: 1px solid var(--line);
}
.page-about .about-contact {
  margin-top: 1.2rem;
  padding: 1.2rem 1.1rem;
  background: linear-gradient(155deg, rgba(18, 59, 50, 0.9), rgba(7, 26, 22, 0.94));
  border: 1px solid var(--line);
  border-top: 2px solid var(--gold);
}
.page-about .about-contact__lines {
  display: grid;
  gap: 0.6rem;
  margin: 0;
}
.page-about .about-contact__lines .dossier-lines__item {
  display: grid;
  gap: 0.15rem;
  padding-bottom: 0.55rem;
  border-bottom: 1px dashed var(--line-soft);
}
.page-about .about-contact__lines .dossier-lines__item:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}
.page-about .about-contact__lines .dossier-lines__value {
  text-align: left;
  font-size: 0.9rem;
  word-break: break-word;
}
.page-about .about-contact__note {
  margin: 1.1rem 0 0;
  padding-top: 0.9rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.82rem;
  line-height: 1.85;
  color: var(--warm-gray);
}
@media (min-width: 720px) {
  .page-about .about-contact {
    padding: 1.5rem;
  }
  .page-about .about-contact__lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0.8rem 1.5rem;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-stats__item,
  .page-about .about-cluster,
  .page-about .about-template,
  .page-about .about-team__item {
    transition: none;
  }
  .page-about .about-stats__item:hover,
  .page-about .about-cluster:hover,
  .page-about .about-template:hover,
  .page-about .about-team__item:hover {
    transform: none;
  }
}