.page-about {
  --about-line: rgba(10, 21, 32, .09);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: linear-gradient(158deg, var(--navy-900) 0%, var(--navy-800) 58%, #1B2F49 100%);
  color: var(--c-text-inv);
  padding: calc(var(--band-y) * .78) 0 var(--band-y);
}

.page-about .about-hero::after {
  content: "ARCHIVE / 12Y";
  position: absolute;
  right: -8px;
  bottom: -0.26em;
  font-family: var(--font-mono);
  font-size: clamp(58px, 15vw, 172px);
  line-height: 1;
  letter-spacing: .04em;
  color: rgba(199, 205, 214, .06);
  pointer-events: none;
  white-space: nowrap;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-crumbs {
  margin-bottom: 30px;
}

.page-about .about-crumbs .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 13px;
  letter-spacing: .04em;
}

.page-about .about-crumbs .crumbs li {
  color: var(--c-text-inv-muted);
}

.page-about .about-crumbs .crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(199, 205, 214, .4);
}

.page-about .about-crumbs .crumbs a {
  color: var(--c-text-inv-muted);
  text-decoration: none;
}

.page-about .about-crumbs .crumbs a:hover {
  color: var(--orange-500);
}

.page-about .about-crumbs .crumbs li[aria-current] {
  color: var(--c-text-inv);
}

.page-about .about-hero .eyebrow {
  color: var(--orange-500);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  font-size: clamp(34px, 7.4vw, 76px);
  font-weight: 900;
  line-height: 1.06;
  letter-spacing: -.02em;
  max-width: 17ch;
}

.page-about .about-hero__title em {
  font-style: normal;
  font-family: var(--font-mono);
  color: var(--orange-500);
}

.page-about .about-hero__lead {
  margin: 24px 0 0;
  max-width: 46ch;
  font-size: clamp(15px, 2.6vw, 18px);
  line-height: 1.78;
  color: var(--c-text-inv-muted);
}

.page-about .about-hero__strip {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 40px 0 0;
  border: 1px solid var(--line-inv);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--line-inv-soft);
}

.page-about .about-hero__strip > div {
  background: rgba(11, 22, 37, .72);
  padding: 16px 18px;
}

.page-about .about-hero__strip dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: rgba(199, 205, 214, .72);
}

.page-about .about-hero__strip dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(22px, 5vw, 34px);
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--c-text-inv);
}

.page-about .about-hero__strip dd .num {
  color: var(--orange-500);
}

/* ---------- 主体布局 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 36px;
  padding: var(--band-y) 0 calc(var(--band-y) * 1.1);
}

.page-about .about-side {
  min-width: 0;
}

.page-about .about-side .toc {
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: var(--paper-100);
  padding: 14px 16px;
}

.page-about .toc__title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--c-text-muted);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: max-content;
  gap: 4px 20px;
  overflow-x: auto;
  padding-bottom: 4px;
}

.page-about .about-toc__list li {
  min-width: 0;
}

.page-about .about-toc__list a {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 6px 0;
  white-space: nowrap;
  font-size: 13px;
  line-height: 1.4;
  color: var(--c-text-muted);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  transition: color .2s var(--ease), border-color .2s var(--ease);
}

.page-about .about-toc__list a .num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
  color: var(--silver-400);
}

.page-about .about-toc__list a:hover {
  color: var(--ink-900);
  border-bottom-color: var(--silver-400);
}

.page-about .about-toc__list a[aria-current="true"] {
  color: var(--ink-900);
  font-weight: 700;
  border-bottom-color: var(--orange-500);
}

.page-about .about-toc__list a[aria-current="true"] .num {
  color: var(--orange-500);
}

.page-about .about-body {
  min-width: 0;
  display: block;
}

/* ---------- 编号章节 ---------- */
.page-about .about-chapter {
  margin-bottom: 84px;
  scroll-margin-top: 104px;
}

.page-about .about-chapter:last-of-type {
  margin-bottom: 64px;
}

.page-about .about-chapter__head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 16px;
  row-gap: 8px;
  align-items: start;
  padding-top: 16px;
  border-top: 1px solid rgba(10, 21, 32, .16);
  margin-bottom: 28px;
}

.page-about .about-chapter__no {
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-size: clamp(42px, 9vw, 92px);
  font-weight: 700;
  line-height: .86;
  letter-spacing: .01em;
  color: rgba(10, 21, 32, .13);
}

.page-about .about-chapter__title {
  grid-column: 2;
  margin: 0;
  font-size: clamp(21px, 3.6vw, 34px);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.page-about .about-tag {
  grid-column: 2;
  justify-self: start;
  display: inline-flex;
  align-items: center;
  gap: 7px;
  padding: 4px 11px;
  border: 1px solid rgba(47, 169, 140, .42);
  border-radius: var(--r-pill);
  background: rgba(47, 169, 140, .08);
  color: var(--jade-500);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .08em;
}

.page-about .about-tag::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: currentColor;
}

.page-about .about-chapter__body {
  font-size: 16px;
  color: var(--c-text);
}

.page-about .about-chapter__body p {
  margin: 0 0 16px;
  line-height: 1.78;
}

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

.page-about .about-note {
  margin-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .03em;
  color: var(--c-text-muted);
}

/* ---------- 分栏 ---------- */
.page-about .about-split {
  display: grid;
  gap: 28px;
  min-width: 0;
}

.page-about .about-split__text,
.page-about .about-split__media {
  min-width: 0;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 6px;
  bottom: 10px;
  border-left: 1px dashed rgba(10, 21, 32, .26);
}

.page-about .about-timeline > li {
  position: relative;
  padding-bottom: 24px;
}

.page-about .about-timeline > li:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline > li::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 6px;
  width: 11px;
  height: 11px;
  background: var(--paper-100);
  border: 1px solid var(--gold-400);
  transform: rotate(45deg);
}

.page-about .about-timeline__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  color: var(--orange-500);
}

.page-about .about-timeline h3 {
  margin: 6px 0 6px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .about-timeline p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(10, 21, 32, .72);
}

.page-about .about-timeline__label + h3 {
  margin-top: 8px;
}

/* ---------- 媒体 ---------- */
.page-about .media {
  display: block;
  margin: 0;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--silver-100);
  box-shadow: var(--shadow-1);
}

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

.page-about .media__cap {
  padding: 10px 14px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--c-text-muted);
  background: var(--paper-100);
  border-top: 1px solid var(--about-line);
}

/* ---------- 编制表 ---------- */
.page-about .about-table-wrap {
  margin: 22px 0 18px;
  overflow-x: auto;
  border: 1px solid var(--about-line);
  border-radius: var(--r-md);
  background: var(--paper-100);
  box-shadow: var(--shadow-1);
  -webkit-overflow-scrolling: touch;
}

.page-about .about-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
  font-size: 15px;
}

.page-about .about-table caption {
  padding: 14px 16px 10px;
  text-align: left;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--c-text-muted);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 13px 16px;
  text-align: left;
  vertical-align: top;
  border-top: 1px solid var(--about-line);
  line-height: 1.65;
}

.page-about .about-table thead th {
  border-top: none;
  background: var(--navy-800);
  color: var(--c-text-inv);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: .08em;
  white-space: nowrap;
}

.page-about .about-table tbody th {
  font-size: 15px;
  font-weight: 800;
  color: var(--ink-900);
  white-space: nowrap;
}

.page-about .about-table td {
  color: rgba(10, 21, 32, .78);
}

.page-about .about-table .is-num {
  text-align: right;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink-900);
  white-space: nowrap;
}

.page-about .about-table tfoot th,
.page-about .about-table tfoot td {
  background: var(--silver-100);
  font-weight: 800;
  color: var(--ink-900);
}

.page-about .about-table tfoot .is-num {
  color: var(--orange-500);
}

/* ---------- 六个小组 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin-top: 24px;
}

.page-about .about-team {
  display: flex;
  flex-direction: column;
  padding: 18px 16px;
  background: #FFFFFF;
  border: 1px solid var(--about-line);
  border-top: 2px solid var(--orange-500);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-1);
  transition: transform .32s var(--ease), box-shadow .32s var(--ease), border-color .32s var(--ease);
}

.page-about .about-team:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
  border-color: rgba(255, 106, 43, .38);
  border-top-color: var(--orange-500);
}

.page-about .about-team__line {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--c-text-muted);
}

.page-about .about-team h3 {
  margin: 8px 0 8px;
  font-size: 18px;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--ink-900);
}

.page-about .about-team p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(10, 21, 32, .74);
}

.page-about .about-team__meta {
  margin-top: auto;
  padding-top: 12px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .06em;
  color: var(--jade-500);
}

/* ---------- 荣誉列表 ---------- */
.page-about .about-honors {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-honors li {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  gap: 16px;
  align-items: start;
  padding: 18px 18px 18px 16px;
  background: var(--paper-100);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--gold-400);
  border-radius: var(--r-md);
}

.page-about .about-honors__mark {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: rgba(10, 21, 32, .22);
  letter-spacing: .04em;
}

.page-about .about-honors h3 {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 800;
  line-height: 1.4;
  color: var(--ink-900);
}

.page-about .about-honors p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(10, 21, 32, .74);
}

/* ---------- 结尾通道 ---------- */
.page-about .about-cta {
  margin-top: 8px;
  padding: 32px 22px;
  border-radius: var(--r-xl);
  background: linear-gradient(140deg, var(--navy-900) 0%, var(--navy-800) 100%);
  color: var(--c-text-inv);
}

.page-about .about-cta h2 {
  margin: 0 0 12px;
  font-size: clamp(21px, 4vw, 30px);
  font-weight: 900;
  line-height: 1.25;
  letter-spacing: -.01em;
}

.page-about .about-cta p {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--c-text-inv-muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

.page-about .about-cta .btn--outline {
  border-color: var(--line-inv);
  color: var(--c-text-inv);
  background: transparent;
}

.page-about .about-cta .btn--outline:hover {
  border-color: var(--orange-500);
  color: var(--orange-500);
}

.page-about .about-cta .btn--ghost {
  color: var(--c-text-inv-muted);
}

.page-about .about-cta .btn--ghost:hover {
  color: var(--orange-500);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__strip {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-chapter {
    margin-bottom: 96px;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.32fr) minmax(0, .68fr);
    gap: 34px;
    align-items: start;
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, .68fr) minmax(0, 1.32fr);
  }

  .page-about .about-split--flip .about-split__text {
    order: 2;
  }

  .page-about .about-split--flip .about-split__media {
    order: 1;
  }

  .page-about .about-team {
    padding: 22px 20px;
  }
}

@media (min-width: 980px) {
  .page-about .about-layout {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: 106px;
  }

  .page-about .about-side .toc {
    background: transparent;
    border: none;
    border-left: 1px solid var(--about-line);
    border-radius: 0;
    padding: 4px 0 4px 16px;
  }

  .page-about .about-toc__list {
    grid-auto-flow: row;
    grid-auto-columns: auto;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-toc__list a {
    padding: 7px 0;
    border-bottom: none;
    border-left: 2px solid transparent;
    padding-left: 10px;
    margin-left: -12px;
    transition: color .2s var(--ease), border-color .2s var(--ease);
  }

  .page-about .about-toc__list a:hover {
    border-bottom-color: transparent;
    border-left-color: var(--silver-400);
  }

  .page-about .about-toc__list a[aria-current="true"] {
    border-bottom-color: transparent;
    border-left-color: var(--orange-500);
    color: var(--ink-900);
  }

  .page-about .about-cta {
    padding: 44px 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team,
  .page-about .about-toc__list a {
    transition: none;
  }

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