.page-about {
  --about-measure: 720px;
  --about-rail-w: 96px;
  color: var(--ink);
  background: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 20px 0 36px;
  border-bottom: 1px solid var(--rule);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(201, 191, 168, 0.5) 0 1px,
    transparent 1px 56px
  );
}

.page-about .breadcrumb {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--steel);
}
.page-about .breadcrumb a {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--brass-light);
}
.page-about .breadcrumb a:hover {
  color: var(--brass);
}
.page-about .breadcrumb span[aria-hidden] {
  margin: 0 8px;
  color: var(--rule);
}

.page-about .about-hero-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 22px;
}

.page-about .eyebrow {
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--brass);
  margin: 0;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: 29px;
  font-weight: 600;
  line-height: 1.3;
  letter-spacing: -0.01em;
  margin: 10px 0 0;
  max-width: 17em;
  color: var(--ink);
}

.page-about .about-lede {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: #3B342C;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--rule);
  border: 1px solid var(--rule);
  box-shadow: 0 1px 0 rgba(30, 26, 22, 0.04);
}

.page-about .about-stat {
  background: var(--paper-lift);
  padding: 14px 14px 16px;
}

.page-about .about-stat dt {
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--steel);
}

.page-about .about-stat dd {
  margin: 7px 0 0;
  font-family: var(--font-data);
  font-size: 21px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--green);
}

/* ---------- 主体框架 ---------- */
.page-about .about-frame {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: 36px 0 40px;
  border-bottom: 1px dashed var(--rule);
  position: relative;
}

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

.page-about .about-sec-rail .chapter-num {
  display: block;
  font-family: var(--font-data);
  font-size: 30px;
  font-weight: 600;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--brass);
}

.page-about .about-sec-body {
  min-width: 0;
  max-width: var(--about-measure);
}

.page-about .about-sec-title {
  font-family: var(--font-head);
  font-size: 23px;
  font-weight: 600;
  line-height: 1.4;
  letter-spacing: 0.01em;
  margin: 0 0 14px;
  padding-bottom: 12px;
  border-bottom: 2px solid var(--green);
  display: inline-block;
}

.page-about .about-sec-body > p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.85;
  color: #3B342C;
}

.page-about .about-link-line {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 24px;
  margin-top: 16px;
}

.page-about .link-more {
  font-size: 14.5px;
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--brass-light);
  padding-bottom: 2px;
}
.page-about .link-more:hover {
  color: var(--brass);
  border-bottom-color: var(--brass);
}

/* ---------- 图片框 ---------- */
.page-about .about-photo {
  margin: 20px 0 24px;
}
.page-about .figure-media {
  overflow: hidden;
  background: var(--paper-lift);
}
.page-about .figure-media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  filter: saturate(0.72) contrast(0.96);
}
.page-about .figure-cap {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--steel);
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  border-top: 1px solid var(--rule);
}

.page-about .about-team {
  display: flex;
  gap: 16px;
  padding: 20px 0;
  border-bottom: 1px dashed var(--rule);
}

.page-about .about-team-no {
  flex: 0 0 38px;
  width: 38px;
  height: 38px;
  display: grid;
  place-items: center;
  border: 1px solid var(--brass);
  border-radius: 50%;
  font-size: 14px;
  font-weight: 600;
  color: var(--brass);
  background: var(--paper-lift);
}

.page-about .about-team-inner {
  min-width: 0;
}

.page-about .about-team h3 {
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--ink);
}

.page-about .about-team p {
  margin: 0 0 8px;
  font-size: 15px;
  line-height: 1.8;
  color: #3B342C;
}

.page-about .about-team-out {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 !important;
  font-size: 13.5px;
  color: var(--steel);
}

.page-about .tag {
  display: inline-block;
  font-family: var(--font-data);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  padding: 2px 8px;
  border: 1px solid var(--brass-light);
  border-radius: 999px;
  color: var(--brass);
  background: rgba(216, 183, 120, 0.12);
}

/* ---------- 流程刻度 ---------- */
.page-about .about-scale {
  list-style: none;
  margin: 22px 0 20px;
  padding: 26px 2px 10px;
  position: relative;
  display: grid;
  grid-template-columns: repeat(5, minmax(0, 1fr));
  gap: 6px;
}

.page-about .about-scale::before {
  content: "";
  position: absolute;
  left: 3%;
  right: 3%;
  top: 32px;
  height: 1px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--rule) 0 5px,
    transparent 5px 11px
  );
}

.page-about .about-scale-item {
  position: relative;
  padding-top: 30px;
  text-align: center;
}

.page-about .about-scale-item::before {
  content: "";
  position: absolute;
  top: 26px;
  left: 50%;
  width: 11px;
  height: 11px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--brass);
  box-shadow: 0 0 0 3px var(--paper);
}

.page-about .about-scale-num {
  display: block;
  font-size: 13px;
  font-weight: 600;
  color: var(--green);
  letter-spacing: 0.08em;
}

.page-about .about-scale-name {
  display: block;
  margin-top: 4px;
  font-size: 12.5px;
  color: var(--steel);
}

/* ---------- 折叠面板 ---------- */
.page-about .about-accordion {
  border-top: 1px solid var(--rule);
}

.page-about .about-accordion .accordion-item {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-acc-h {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .about-acc-trigger {
  display: flex;
  align-items: baseline;
  gap: 12px;
  width: 100%;
  background: none;
  border: 0;
  padding: 15px 2px;
  text-align: left;
  cursor: pointer;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
  transition: color 140ms ease-out;
}

.page-about .about-acc-trigger:hover {
  color: var(--brass);
}

.page-about .about-acc-trigger:focus-visible {
  outline: 2px solid var(--brass);
  outline-offset: 2px;
}

.page-about .about-acc-num {
  flex: 0 0 auto;
  font-size: 13px;
  font-weight: 600;
  color: var(--brass);
  letter-spacing: 0.06em;
}

.page-about .about-acc-panel {
  padding: 0 2px 16px 36px;
}

.page-about .about-acc-panel p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: #3B342C;
}

/* ---------- 编号分解 ---------- */
.page-about .about-codebar {
  display: flex;
  flex-wrap: wrap;
  align-items: stretch;
  gap: 6px;
  margin: 20px 0 14px;
}

.page-about .about-code-seg {
  flex: 1 1 120px;
  min-width: 0;
  padding: 14px 16px 12px;
  display: flex;
  flex-direction: column;
  gap: 6px;
  border: 1px solid var(--rule);
}

.page-about .about-code-val {
  font-size: 24px;
  font-weight: 600;
  letter-spacing: 0.04em;
  line-height: 1;
}

.page-about .about-code-tag {
  font-size: 12.5px;
  letter-spacing: 0.08em;
}

.page-about .about-code-seg--gen {
  background: var(--green);
  border-color: var(--green);
}
.page-about .about-code-seg--gen .about-code-val,
.page-about .about-code-seg--gen .about-code-tag {
  color: var(--paper-lift);
}
.page-about .about-code-seg--gen .about-code-tag {
  color: var(--brass-light);
}

.page-about .about-code-seg--mon {
  background: var(--brass);
  border-color: var(--brass);
}
.page-about .about-code-seg--mon .about-code-val,
.page-about .about-code-seg--mon .about-code-tag {
  color: var(--paper-lift);
}

.page-about .about-code-seg--id {
  background: var(--paper-lift);
  border-color: var(--rule);
}
.page-about .about-code-seg--id .about-code-val {
  color: var(--ink);
}
.page-about .about-code-seg--id .about-code-tag {
  color: var(--steel);
}

.page-about .about-code-sep {
  align-self: center;
  color: var(--rule);
  font-size: 20px;
}

.page-about .about-code-read {
  font-size: 15px;
  line-height: 1.8;
  color: var(--green);
  margin: 0 0 18px;
  padding-left: 12px;
  border-left: 3px solid var(--brass);
}

.page-about .about-code-examples {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
  border-top: 1px dashed var(--rule);
}

.page-about .about-code-examples li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  padding: 12px 2px;
  border-bottom: 1px dashed var(--rule);
}

.page-about .about-code-ex {
  font-size: 15px;
  font-weight: 600;
  color: var(--alert);
  letter-spacing: 0.04em;
}

.page-about .about-code-ex-txt {
  font-size: 14px;
  color: var(--steel);
}

.page-about .about-plate {
  margin: 22px 0 0;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-kpis {
  list-style: none;
  margin: 4px 0 22px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--rule);
  border: 1px solid var(--rule);
}

.page-about .about-kpi {
  background: var(--paper-lift);
  padding: 16px 16px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-kpi .kpi-num {
  font-family: var(--font-data);
  font-size: 28px;
  font-weight: 600;
  line-height: 1;
  color: var(--green);
  letter-spacing: 0.01em;
}

.page-about .about-kpi .kpi-label {
  font-size: 13px;
  color: var(--steel);
  letter-spacing: 0.04em;
}

/* ---------- 素材来源面板 ---------- */
.page-about .about-sources {
  margin: 18px 0 22px;
  padding: 22px 20px;
  background: var(--green-deep);
  border: 1px solid var(--green-deep);
}

.page-about .about-src-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .about-src-cap {
  margin: 0 0 10px;
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--brass-light);
}

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

.page-about .about-src-list li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 9px 0;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--paper-lift);
  border-bottom: 1px dashed rgba(216, 183, 120, 0.3);
}

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

.page-about .about-src-list .mono {
  flex: 0 0 auto;
  font-size: 12.5px;
  color: var(--brass-light);
  letter-spacing: 0.06em;
}

.page-about .about-src-note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid rgba(216, 183, 120, 0.28);
  font-size: 14px;
  line-height: 1.8;
  color: rgba(251, 247, 238, 0.82);
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  display: none;
}

.page-about .about-toc-title {
  margin: 0 0 14px;
  font-size: 12.5px;
  letter-spacing: 0.14em;
  color: var(--steel);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--rule);
}

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

.page-about .about-toc-list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 1px;
  background-image: repeating-linear-gradient(
    180deg,
    var(--rule) 0 4px,
    transparent 4px 9px
  );
}

.page-about .about-toc-list li {
  margin: 0;
}

.page-about .toc-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 0 8px 14px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--steel);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: color 140ms ease-out, border-color 140ms ease-out;
}

.page-about .toc-link .mono {
  font-size: 12px;
  color: var(--brass);
  letter-spacing: 0.06em;
}

.page-about .toc-link:hover,
.page-about .toc-link:focus-visible {
  color: var(--green);
  border-left-color: var(--brass-light);
}

.page-about .toc-link.is-active {
  color: var(--green);
  border-left-color: var(--brass);
}

/* ---------- 延伸浏览 ---------- */
.page-about .about-next {
  margin-top: 12px;
  padding: 40px 0 46px;
  background: var(--paper-lift);
  border-top: 1px solid var(--rule);
  background-image: repeating-linear-gradient(
    90deg,
    rgba(201, 191, 168, 0.45) 0 1px,
    transparent 1px 56px
  );
}

.page-about .about-next-title {
  font-family: var(--font-head);
  font-size: 21px;
  font-weight: 600;
  line-height: 1.45;
  margin: 10px 0 22px;
  color: var(--ink);
}

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

.page-about .about-next-list li {
  background: var(--paper-lift);
}

.page-about .about-next-list a {
  display: block;
  padding: 18px 18px 20px;
  text-decoration: none;
  color: inherit;
  transition: background-color 140ms ease-out;
}

.page-about .about-next-list a:hover,
.page-about .about-next-list a:focus-visible {
  background: var(--paper);
}

.page-about .about-next-name {
  display: block;
  font-family: var(--font-head);
  font-size: 16.5px;
  font-weight: 600;
  color: var(--green);
  padding-bottom: 8px;
  border-bottom: 1px dashed var(--rule);
}

.page-about .about-next-desc {
  display: block;
  margin-top: 10px;
  font-size: 14px;
  line-height: 1.8;
  color: #3B342C;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero h1 {
    font-size: 34px;
  }
  .page-about .about-hero-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-kpis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about .about-src-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 26px;
  }
  .page-about .about-next-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 24px 0 44px;
  }
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: 44px;
    align-items: end;
  }
  .page-about .about-hero h1 {
    font-size: 40px;
    line-height: 1.26;
  }
  .page-about .about-lede {
    font-size: 16px;
  }

  .page-about .about-sec {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 26px;
    padding: 48px 0 52px;
  }

  .page-about .about-sec-rail {
    padding-top: 4px;
  }

  .page-about .about-sec-rail .chapter-num {
    font-size: 46px;
    position: relative;
  }

  .page-about .about-sec-rail .chapter-num::after {
    content: "";
    display: block;
    width: 1px;
    height: 42px;
    margin: 14px 0 0 6px;
    background-image: repeating-linear-gradient(
      180deg,
      var(--rule) 0 4px,
      transparent 4px 9px
    );
  }

  .page-about .about-sec-title {
    font-size: 26px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-codebar {
    gap: 8px;
  }
  .page-about .about-code-seg {
    padding: 18px 20px 15px;
  }
  .page-about .about-code-val {
    font-size: 28px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-frame {
    grid-template-columns: minmax(0, 1fr) 200px;
    gap: 56px;
    align-items: start;
  }

  .page-about .about-toc {
    display: block;
    position: sticky;
    top: calc(var(--top-h) + 76px);
    align-self: start;
    padding-top: 52px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero h1 {
    font-size: 44px;
  }
}

@media (max-width: 420px) {
  .page-about .about-scale {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    row-gap: 18px;
  }
  .page-about .about-scale::before {
    display: none;
  }
  .page-about .about-scale-item {
    padding-top: 22px;
  }
  .page-about .about-scale-item::before {
    top: 6px;
    box-shadow: none;
  }
}