.page-about {
  background: var(--paper);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(18px, 3vw, 28px) 0 clamp(38px, 6vw, 72px);
  border-bottom: 1px solid var(--rule);
  background: linear-gradient(180deg, rgba(231, 223, 207, .62) 0%, rgba(247, 242, 231, 0) 76%);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  right: -18%;
  bottom: -58%;
  width: min(760px, 96vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(198, 151, 59, .2), rgba(198, 151, 59, 0) 72%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: -1;
  left: -8%;
  top: -34%;
  width: min(520px, 70vw);
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: radial-gradient(closest-side, rgba(31, 77, 58, .09), rgba(31, 77, 58, 0) 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(26px, 4.5vw, 52px);
  align-items: end;
  margin-top: clamp(20px, 3.4vw, 36px);
}

.page-about .about-hero__title {
  margin: .28em 0 .52em;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(34px, 6vw, 72px);
  line-height: 1.12;
  letter-spacing: .01em;
  color: var(--green-deep);
}

.page-about .about-hero__lead {
  max-width: 34em;
  margin: 0;
  font-size: clamp(15.5px, 1.25vw, 17.5px);
  line-height: 1.9;
  color: rgba(27, 27, 24, .84);
}

.page-about .about-hero__plate {
  background: var(--paper-card);
  border: 1px solid var(--rule-strong);
  border-top: 3px solid var(--gold);
  padding: 16px 18px 14px;
  box-shadow: 6px 6px 0 0 var(--paper-2), 6px 6px 0 1px var(--rule-strong);
}

.page-about .about-plate__head {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--husk);
}

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

.page-about .about-plate__list li {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 8px 0;
  border-bottom: 1px dashed var(--rule-strong);
  font-size: 13px;
}

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

.page-about .about-plate__list span {
  color: rgba(27, 27, 24, .66);
}

.page-about .about-plate__list b {
  font-family: var(--mono);
  font-weight: 500;
  color: var(--green-deep);
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) 262px;
  }

  .page-about .about-hero__plate {
    transform: rotate(-1.4deg);
  }
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-body {
  padding: clamp(34px, 5vw, 64px) 0 clamp(46px, 7vw, 88px);
}

.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 30px);
}

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

/* ---------- 左栏批次索引 ---------- */
.page-about .about-index {
  border: 1px solid var(--rule);
  background: var(--paper-card);
  padding: 14px 12px;
}

.page-about .about-index .index-nav__title {
  margin: 0 0 10px;
  padding: 0 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .2em;
  color: var(--husk);
}

.page-about .about-index .index-nav__link {
  display: block;
  padding: 8px 10px;
  border-left: 2px solid transparent;
  font-size: 14px;
  line-height: 1.5;
  color: var(--ink);
  text-decoration: none;
  transition: background .18s var(--ease), border-color .18s var(--ease), color .18s var(--ease);
}

.page-about .about-index .index-nav__link:hover {
  color: var(--green);
  background: rgba(82, 122, 99, .08);
}

.page-about .about-index .index-nav__link.is-active,
.page-about .about-index .index-nav__link[aria-current="true"] {
  border-left-color: var(--gold);
  background: rgba(230, 211, 162, .4);
  color: var(--green-deep);
  font-weight: 600;
}

.page-about .about-side__note {
  margin-top: 20px;
  padding: 2px 0 2px 14px;
  border-left: 2px solid var(--gold);
}

.page-about .about-side__label {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--husk);
}

.page-about .about-side__note p:last-child {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: rgba(27, 27, 24, .72);
}

@media (max-width: 959px) {
  .page-about .about-index {
    display: flex;
    align-items: center;
    gap: 6px;
    overflow-x: auto;
    padding: 10px;
    -webkit-overflow-scrolling: touch;
  }

  .page-about .about-index .index-nav__title {
    display: none;
  }

  .page-about .about-index .index-nav__link {
    flex: 0 0 auto;
    white-space: nowrap;
    border-left: 0;
    border-bottom: 2px solid transparent;
    padding: 6px 12px;
    font-size: 13px;
  }

  .page-about .about-index .index-nav__link.is-active,
  .page-about .about-index .index-nav__link[aria-current="true"] {
    border-left-color: transparent;
    border-bottom-color: var(--gold);
  }
}

@media (min-width: 960px) {
  .page-about .about-split {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
    align-items: start;
  }

  .page-about .about-side {
    position: sticky;
    top: 92px;
  }
}

/* ---------- 章节 ---------- */
.page-about .story-section {
  scroll-margin-top: 96px;
  padding-block: clamp(34px, 5vw, 58px);
  border-top: 1px solid var(--rule);
}

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

.page-about .story-h2 {
  margin: .32em 0 .68em;
  font-family: var(--serif);
  font-weight: 600;
  font-size: clamp(26px, 3.4vw, 40px);
  line-height: 1.24;
  letter-spacing: .005em;
  color: var(--green-deep);
}

.page-about .story-text {
  margin: 0 0 1em;
  max-width: 36em;
  font-size: clamp(15.5px, 1.15vw, 16.5px);
  line-height: 1.9;
  color: rgba(27, 27, 24, .86);
}

.page-about .story-text:last-child {
  margin-bottom: 0;
}

.page-about .story-text a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid rgba(31, 77, 58, .35);
  transition: color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .story-text a:hover {
  color: var(--cinnabar);
  border-bottom-color: var(--cinnabar);
}

/* ---------- 四类资料 ---------- */
.page-about .catalog-grid {
  display: grid;
  gap: 14px;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding-bottom: 0;
}

.page-about .catalog-card {
  position: relative;
  padding: 20px 18px 18px;
  background: var(--paper-card);
  border: 1px solid var(--rule-strong);
  border-left: 3px solid var(--gold);
  transition: transform .2s var(--ease), box-shadow .2s var(--ease);
}

.page-about .catalog-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 24px -18px rgba(27, 27, 24, .6);
}

.page-about .catalog-card__num {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .16em;
  color: var(--husk);
}

.page-about .catalog-card__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.3;
  color: var(--green-deep);
}

.page-about .catalog-card__desc {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.82;
  color: rgba(27, 27, 24, .78);
}

@media (min-width: 640px) {
  .page-about .catalog-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 16px;
    row-gap: 16px;
    padding-bottom: 16px;
  }

  .page-about .catalog-card:nth-child(even) {
    transform: translateY(16px);
  }

  .page-about .catalog-card:nth-child(even):hover {
    transform: translateY(13px);
  }
}

/* ---------- 图片框 ---------- */
.page-about .about-figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
  background: var(--paper-card);
  border: 1px solid var(--rule-strong);
  padding: 10px 10px 0;
  box-shadow: 7px 7px 0 0 var(--paper-2);
}

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

.page-about .about-figure__cap {
  margin-top: 10px;
  padding: 9px 4px 11px;
  border-top: 1px dashed var(--rule-strong);
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .04em;
  line-height: 1.6;
  color: var(--husk);
}

/* ---------- 折叠规则 ---------- */
.page-about .method-fold {
  margin-top: clamp(22px, 3.4vw, 32px);
  border: 1px solid var(--rule-strong);
  background: var(--paper-card);
}

.page-about .method-fold summary {
  cursor: pointer;
  padding: 14px 16px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--green-deep);
  list-style: none;
}

.page-about .method-fold summary::-webkit-details-marker {
  display: none;
}

.page-about .method-fold summary::before {
  content: "+";
  display: inline-block;
  width: 1.2em;
  color: var(--gold);
}

.page-about .method-fold[open] summary::before {
  content: "−";
}

.page-about .method-fold .fold__body {
  padding: 14px 16px 18px;
  border-top: 1px dashed var(--rule-strong);
}

.page-about .rule-list {
  margin: 0;
  padding-left: 1.2em;
}

.page-about .rule-list li {
  margin-bottom: .55em;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(27, 27, 24, .82);
}

.page-about .rule-list li:last-child {
  margin-bottom: 0;
}

/* ---------- 批次时间轴 ---------- */
.page-about .chronicle {
  list-style: none;
  margin: clamp(22px, 3.4vw, 32px) 0 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--rule-strong);
}

.page-about .chronicle__item {
  position: relative;
  padding-bottom: clamp(22px, 3.2vw, 34px);
}

.page-about .chronicle__item:last-child {
  padding-bottom: 0;
}

.page-about .chronicle__item .timeline__dot {
  position: absolute;
  left: -30px;
  top: 5px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
}

.page-about .chronicle__item:first-child .timeline__dot {
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(198, 151, 59, .2);
}

.page-about .chronicle__item .timeline__date {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 8px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: .12em;
  color: var(--husk);
}

.page-about .chronicle__state {
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--cinnabar);
}

.page-about .chronicle__title {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  line-height: 1.42;
  color: var(--green-deep);
}

.page-about .chronicle__desc {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(27, 27, 24, .8);
}

/* ---------- 团队台账 ---------- */
.page-about .team-ledger {
  display: grid;
  gap: 16px;
  margin: clamp(22px, 3.4vw, 30px) 0;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
}

.page-about .team-ledger__item {
  padding-top: 12px;
  border-top: 2px solid var(--green);
}

.page-about .team-ledger__num {
  display: block;
  font-family: var(--serif);
  font-size: clamp(34px, 4.4vw, 48px);
  font-weight: 600;
  line-height: 1;
  color: var(--green-deep);
}

.page-about .team-ledger__cap {
  display: block;
  margin-top: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--husk);
}

/* ---------- 开放方式 ---------- */
.page-about .access-card {
  display: grid;
  gap: 20px;
  margin-top: clamp(22px, 3.4vw, 32px);
  padding: clamp(22px, 3.6vw, 34px);
  background: var(--green);
  border-top: 3px solid var(--gold);
  color: var(--paper);
}

.page-about .access-card__title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: clamp(20px, 2.4vw, 26px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
}

.page-about .access-card p {
  margin: 0 0 10px;
  max-width: 32em;
  font-size: 14.5px;
  line-height: 1.9;
  color: rgba(247, 242, 231, .84);
}

.page-about .access-card .access-card__addr {
  margin-bottom: 0;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: .04em;
  line-height: 1.7;
  color: var(--gold-soft);
}

.page-about .access-link {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: 10px;
  padding: 13px 22px;
  background: var(--gold-soft);
  border: 1px solid var(--gold);
  color: var(--green-deep);
  font-size: 15px;
  font-weight: 600;
  text-decoration: none;
  box-shadow: 4px 4px 0 0 rgba(18, 51, 40, .55);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease);
}

.page-about .access-link:hover {
  transform: translate(-1px, -1px);
  box-shadow: 6px 6px 0 0 rgba(18, 51, 40, .55);
}

.page-about .access-link:focus-visible {
  outline: 3px solid var(--gold-soft);
  outline-offset: 2px;
}

@media (min-width: 780px) {
  .page-about .access-card {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .catalog-card,
  .page-about .catalog-card:nth-child(even),
  .page-about .catalog-card:nth-child(even):hover,
  .page-about .access-link {
    transition: none;
    transform: none;
  }

  .page-about .about-hero__plate {
    transform: none;
  }
}