.page-about {
  --about-line: rgba(36, 28, 20, 0.14);
  --about-gap: clamp(48px, 7vw, 88px);
  background: var(--paper);
  color: var(--ink);
}

.page-about .breadcrumbs {
  margin-top: 18px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: 34px 0 52px;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  right: -34%;
  bottom: -14%;
  width: 118%;
  height: 58%;
  background: var(--navy);
  border-radius: 72px 0 0 0;
  transform: rotate(-6deg);
  z-index: -1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 30px;
}

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

.page-about .about-hero__lead h1 {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(2rem, 5.4vw, 3.25rem);
  line-height: 1.18;
  letter-spacing: 0.01em;
  margin: 10px 0 16px;
  max-width: 18em;
}

.page-about .about-hero__lead .lede {
  font-size: 1.0625rem;
  line-height: 1.75;
  color: var(--slate);
  max-width: 60ch;
  margin: 0;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  border-left: 2px solid var(--grass);
  padding-left: 10px;
}

.page-about .about-stat__value {
  display: block;
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .about-stat__label {
  display: block;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--slate);
  margin-top: 2px;
}

.page-about .about-hero__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 26px 0 0;
}

.page-about .about-hero__figure {
  position: relative;
  z-index: 1;
  margin: 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  box-shadow: 0 18px 42px rgba(16, 48, 74, 0.24);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 48px 0 88px;
  }

  .page-about .about-hero::before {
    top: -26%;
    right: -16%;
    bottom: auto;
    width: min(720px, 74%);
    height: 168%;
    border-radius: 0 0 0 120px;
    transform: rotate(11deg);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 48px;
  }

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

/* ---------- 外壳：目录 + 正文 ---------- */
.page-about .about-shell {
  display: grid;
  gap: 26px;
  padding-top: 6px;
  padding-bottom: 72px;
}

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: 188px minmax(0, 1fr);
    gap: 56px;
    align-items: start;
    padding-top: 24px;
    padding-bottom: 104px;
  }
}

.page-about .about-toc__title {
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  color: var(--slate);
  margin: 0 0 10px;
}

.page-about .about-toc__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 12px;
  border-radius: 999px;
  background: var(--sand);
  color: var(--ink);
  font-size: 0.875rem;
  text-decoration: none;
  white-space: nowrap;
  transition: background var(--dur) var(--ease), color var(--dur) var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: var(--grass);
  color: var(--bright);
}

.page-about .about-toc__link .mono {
  font-size: 0.75rem;
  color: var(--slate);
}

.page-about .about-toc__link:hover .mono,
.page-about .about-toc__link:focus-visible .mono {
  color: var(--bright);
}

@media (min-width: 980px) {
  .page-about .about-toc {
    position: sticky;
    top: 32px;
    align-self: start;
  }

  .page-about .about-toc__list {
    display: block;
    overflow: visible;
    padding: 0;
    border-left: 2px solid var(--sand);
  }

  .page-about .about-toc__link {
    display: flex;
    margin-left: -2px;
    padding: 8px 0 8px 16px;
    border-left: 2px solid transparent;
    border-radius: 0;
    background: none;
    white-space: normal;
    line-height: 1.5;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    background: none;
    border-left-color: var(--grass);
    color: var(--grass-deep);
  }

  .page-about .about-toc__link:hover .mono,
  .page-about .about-toc__link:focus-visible .mono {
    color: var(--grass-deep);
  }
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: 40px 0 44px;
  border-top: 1px solid var(--about-line);
  scroll-margin-top: 88px;
}

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

.page-about .about-plate {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 12px;
}

.page-about .about-chapter__title {
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.25rem);
  line-height: 1.28;
  letter-spacing: 0.01em;
  margin: 0 0 14px;
  max-width: 20em;
}

.page-about .about-chapter__lede {
  font-size: 1.0625rem;
  line-height: 1.78;
  color: var(--slate);
  max-width: 64ch;
  margin: 0 0 26px;
}

.page-about .about-chapter__body {
  max-width: 68ch;
}

.page-about .about-chapter__body p {
  margin: 0 0 1.05em;
  line-height: 1.78;
}

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

.page-about .about-chapter__body .pullquote {
  margin: 1.6em 0;
  padding: 4px 0 4px 20px;
  border-left: 3px solid var(--grass);
  font-family: var(--font-serif);
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--navy);
}

.page-about .about-subtitle {
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--navy);
  margin: 38px 0 0;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--about-line);
}

/* ---------- 图版 ---------- */
.page-about .about-figure {
  margin: 0 0 30px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius);
  background: var(--sand);
}

/* ---------- 纵向时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 30px 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--grass) 0%, var(--grass-soft) 58%, var(--sand) 100%);
}

.page-about .about-timeline > li + li {
  margin-top: 16px;
}

.page-about .about-node {
  position: relative;
  background: var(--bright);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
}

.page-about .about-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 20px;
  width: 14px;
  height: 14px;
  box-sizing: border-box;
  border-radius: 50%;
  background: var(--bright);
  border: 3px solid var(--navy);
}

.page-about .about-node[open]::before {
  border-color: var(--grass);
  background: var(--grass);
}

.page-about .about-node__summary {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  transition: background var(--dur) var(--ease);
}

.page-about .about-node__summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node__summary:hover {
  background: var(--sand);
}

.page-about .about-node__summary:focus-visible {
  outline: 2px solid var(--grass);
  outline-offset: -2px;
}

.page-about .about-node__year {
  flex: none;
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--navy);
}

.page-about .about-node__title {
  flex: 1 1 auto;
  font-size: 0.9375rem;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
}

.page-about .about-node__summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.125rem;
  line-height: 1;
  color: var(--grass);
}

.page-about .about-node[open] .about-node__summary::after {
  content: "–";
}

.page-about .about-node__body {
  padding: 0 18px 18px;
  border-top: 1px solid var(--about-line);
  margin-top: 0;
  padding-top: 14px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--slate);
}

.page-about .about-node__body p {
  margin: 0;
}

/* ---------- 区域分区 ---------- */
.page-about .about-zones {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-zone {
  position: relative;
  padding: 18px 16px 16px;
  background: var(--sand);
  border-radius: var(--radius);
  border-top: 4px solid var(--zone, var(--grass));
  transition: background var(--dur) var(--ease), transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .about-zone:hover {
  background: var(--bright);
  transform: translateY(-3px);
  box-shadow: 0 12px 26px rgba(16, 48, 74, 0.16);
}

.page-about .about-zone__name {
  display: block;
  font-size: 0.9375rem;
  font-weight: 700;
  color: var(--ink);
  letter-spacing: 0.08em;
}

.page-about .about-zone__count {
  display: block;
  font-size: 2rem;
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--navy);
  margin: 6px 0 4px;
  transition: color var(--dur) var(--ease);
}

.page-about .about-zone:hover .about-zone__count {
  color: var(--grass-deep);
}

.page-about .about-zone__note {
  display: block;
  font-size: 0.8125rem;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-zones__hint {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--cyan);
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--slate);
  max-width: 62ch;
}

/* ---------- 团队 ---------- */
.page-about .about-crew {
  display: grid;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-crew__item {
  padding: 18px 16px;
  background: var(--bright);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--grass);
  border-radius: 0 var(--radius) var(--radius) 0;
}

.page-about .about-crew__item:nth-child(2) {
  border-left-color: var(--cyan);
}

.page-about .about-crew__item:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .about-crew__no {
  display: block;
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--slate);
}

.page-about .about-crew__name {
  font-family: var(--font-serif);
  font-size: 1.1875rem;
  font-weight: 700;
  margin: 6px 0 8px;
  color: var(--ink);
}

.page-about .about-crew__desc {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--slate);
}

@media (min-width: 780px) {
  .page-about .about-crew {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 校对流程 ---------- */
.page-about .about-steps {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-step:last-child {
  border-bottom: 0;
}

.page-about .about-step__no {
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--grass);
  line-height: 1.2;
}

.page-about .about-step__title {
  font-size: 1rem;
  font-weight: 700;
  margin: 0 0 6px;
  color: var(--navy);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--slate);
  max-width: 60ch;
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 16px;
  margin: 0 0 8px;
}

.page-about .about-partner {
  padding: 22px 20px;
  background: var(--navy);
  color: var(--paper);
  border-radius: var(--radius);
}

.page-about .about-partner__num {
  display: block;
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--grass-soft);
}

.page-about .about-partner__label {
  display: block;
  font-size: 0.9375rem;
  letter-spacing: 0.1em;
  margin-top: 2px;
  color: var(--bright);
}

.page-about .about-partner__desc {
  margin: 12px 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: rgba(246, 241, 230, 0.82);
}

@media (min-width: 720px) {
  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

.page-about .about-phases li {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-line);
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--slate);
}

.page-about .about-phases li:last-child {
  border-bottom: 0;
}

.page-about .about-phases .mono {
  font-size: 0.8125rem;
  letter-spacing: 0.12em;
  color: var(--grass-deep);
  font-weight: 700;
}

/* ---------- 内容积累 ---------- */
.page-about .about-record {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--about-line);
  border: 1px solid var(--about-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-record__item {
  padding: 22px 18px;
  background: var(--sand);
}

.page-about .about-record__value {
  display: block;
  font-size: clamp(1.375rem, 4vw, 1.875rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: 0.02em;
  color: var(--navy);
}

.page-about .about-record__label {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--slate);
}

@media (min-width: 720px) {
  .page-about .about-record {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

.page-about .about-next {
  margin: 30px 0 0;
  padding: 18px 20px;
  background: var(--bright);
  border-left: 3px solid var(--grass);
  border-radius: 0 var(--radius) var(--radius) 0;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--slate);
  max-width: 66ch;
}

.page-about .about-links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 20px 0 0;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about {
  --zone: currentColor;
}