.page-about {
  --about-measure: 34em;
  background-color: var(--paper-100);
  background-image: radial-gradient(circle at 1px 1px, rgba(26, 23, 20, .055) 1px, transparent 0);
  background-size: 4px 4px;
  color: var(--ink-900);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--green-900);
  color: var(--paper-100);
  padding: 26px 0 54px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -24%;
  right: -18%;
  width: 84%;
  height: 148%;
  background: linear-gradient(152deg, rgba(242, 138, 46, .24), rgba(53, 214, 196, .08) 46%, transparent 68%);
  clip-path: polygon(42% 0, 100% 0, 100% 100%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--apricot-500) 0 22%, var(--cyan-400) 22% 30%, transparent 30%);
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-about .about-hero-copy .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-hero .breadcrumb-link,
.page-about .about-hero .breadcrumb-list li {
  color: rgba(244, 235, 221, .72);
}

.page-about .about-hero .breadcrumb-link:hover,
.page-about .about-hero .breadcrumb-link:focus-visible {
  color: var(--apricot-300);
}

.page-about .about-hero .breadcrumb-current {
  color: var(--apricot-300);
}

.page-about .about-hero .eyebrow {
  color: var(--gold-400);
  margin-bottom: 14px;
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  font-family: var(--font-cond);
  font-weight: 800;
  font-size: clamp(34px, 8.2vw, 66px);
  line-height: 1.05;
  letter-spacing: -.012em;
  color: var(--paper-100);
}

.page-about .about-hero .lede {
  max-width: 32em;
  margin: 0;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 235, 221, .84);
}

.page-about .about-hero-figure {
  margin: 0;
  padding: 7px;
  background: var(--green-800);
  border: 1px solid var(--line-paper);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(.92) contrast(1.06);
}

.page-about .about-hero .media-caption {
  margin: 8px 2px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: rgba(244, 235, 221, .68);
}

/* ---------- 双栏主体 ---------- */
.page-about .about-body {
  display: grid;
  gap: 30px;
  padding-top: 42px;
  padding-bottom: 64px;
}

/* ---------- 粘性章节目录 ---------- */
.page-about .about-index {
  border-top: 2px solid var(--ink-900);
  padding-top: 12px;
}

.page-about .about-index-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .16em;
  color: var(--grey-green);
}

.page-about .about-index-list {
  display: flex;
  flex-wrap: wrap;
  gap: 2px 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-index-link {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  padding: 7px 0;
  font-size: 14px;
  line-height: 1.4;
  color: var(--ink-700);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .about-index-link:hover,
.page-about .about-index-link:focus-visible {
  color: var(--ink-900);
  border-bottom-color: var(--apricot-500);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding-top: 36px;
  border-top: 1px solid var(--line-ink-soft);
  scroll-margin-top: 96px;
}

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

.page-about .about-section .eyebrow {
  color: var(--grey-green);
  letter-spacing: .14em;
}

.page-about .about-section h2 {
  margin: 12px 0 18px;
  font-family: var(--font-cond);
  font-weight: 800;
  font-size: clamp(23px, 5.4vw, 38px);
  line-height: 1.16;
  letter-spacing: -.008em;
  color: var(--ink-900);
}

.page-about .about-text {
  max-width: var(--about-measure);
}

.page-about .about-text p {
  margin: 0 0 14px;
  font-size: 15.5px;
  line-height: 1.86;
  color: var(--ink-700);
}

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

/* ---------- 旁注（可展开） ---------- */
.page-about .about-note {
  max-width: var(--about-measure);
  margin: 22px 0 0;
  padding: 11px 15px 13px;
  background: var(--paper-200);
  border-left: 2px solid var(--gold-400);
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-700);
}

.page-about .about-note summary {
  cursor: pointer;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--ink-900);
}

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

.page-about .about-note summary::after {
  content: "+";
  float: right;
  font-size: 14px;
  color: var(--apricot-500);
}

.page-about .about-note[open] summary::after {
  content: "−";
}

.page-about .about-note p {
  margin: 9px 0 0;
  font-size: 13px;
  line-height: 1.78;
}

/* ---------- 内容生产流程 ---------- */
.page-about .about-flow {
  margin: 26px 0 4px;
  padding: 0;
  list-style: none;
  border-left: 1px solid var(--line-ink);
}

.page-about .about-flow-item {
  position: relative;
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 12px;
  padding: 0 0 22px 0;
}

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

.page-about .about-flow-num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 22px;
  height: 22px;
  margin-left: -11px;
  background: var(--green-900);
  color: var(--apricot-300);
  font-size: 10px;
  letter-spacing: .06em;
}

.page-about .about-flow-item h3 {
  margin: 0 0 5px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--ink-900);
}

.page-about .about-flow-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-700);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 28px 0 0;
  padding: 7px;
  background: var(--paper-200);
  border: 1px solid var(--line-ink);
}

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

.page-about .about-figure--wide img {
  aspect-ratio: 14 / 9;
}

.page-about .about-figure--tall img {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure .media-caption {
  margin: 8px 2px 2px;
  font-size: 12px;
  line-height: 1.6;
  color: var(--grey-green);
}

/* ---------- 团队刻度条 ---------- */
.page-about .about-team {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team-item {
  padding: 14px 0 16px;
  border-top: 1px solid var(--line-ink);
}

.page-about .about-team-item:last-child {
  border-bottom: 1px solid var(--line-ink);
}

.page-about .about-team-head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-team-name {
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 18px;
  letter-spacing: .01em;
  color: var(--ink-900);
}

.page-about .about-team-num {
  font-size: 12px;
  letter-spacing: .06em;
  color: var(--apricot-500);
}

.page-about .about-team-track {
  display: block;
  height: 6px;
  margin: 9px 0 9px;
  background: var(--paper-200);
  overflow: hidden;
}

.page-about .about-team-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--apricot-500), var(--apricot-300));
}

.page-about .about-team-desc {
  display: block;
  font-size: 14px;
  line-height: 1.75;
  color: var(--grey-green);
}

/* ---------- 版本时间轴 ---------- */
.page-about .about-timeline {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .about-timeline-item {
  position: relative;
  padding: 18px 20px 24px;
  background: var(--green-800);
  border-left: 2px solid var(--cyan-400);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 15px), calc(100% - 15px) 100%, 0 100%);
  transition: border-color var(--ease), background-color var(--ease);
}

.page-about .about-timeline-item:hover {
  border-left-color: var(--apricot-500);
  background: var(--green-700);
}

.page-about .about-timeline-node {
  position: absolute;
  left: -5px;
  top: 22px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--apricot-500);
}

.page-about .about-timeline-ver {
  display: inline-block;
  margin-bottom: 9px;
  padding: 3px 8px;
  font-size: 11px;
  letter-spacing: .1em;
  color: var(--cyan-400);
  border: 1px solid var(--line-gold);
}

.page-about .about-timeline-item h3 {
  margin: 0 0 6px;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: .01em;
  color: var(--paper-100);
}

.page-about .about-timeline-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: rgba(244, 235, 221, .8);
}

/* ---------- 收尾入口 ---------- */
.page-about .about-cta {
  display: grid;
  gap: 1px;
  margin-top: 26px;
  background: var(--line-ink);
  border: 1px solid var(--line-ink);
}

.page-about .about-cta-item {
  display: block;
  padding: 16px 18px 18px;
  background: var(--paper-100);
  color: var(--ink-900);
  text-decoration: none;
  transition: background-color var(--ease), color var(--ease);
}

.page-about .about-cta-item:hover,
.page-about .about-cta-item:focus-visible {
  background: var(--apricot-500);
  color: var(--green-900);
}

.page-about .about-cta-k {
  display: block;
  font-size: 11px;
  letter-spacing: .12em;
  color: var(--grey-green);
  margin-bottom: 6px;
}

.page-about .about-cta-item:hover .about-cta-k,
.page-about .about-cta-item:focus-visible .about-cta-k {
  color: var(--green-900);
}

.page-about .about-cta-t {
  display: block;
  font-family: var(--font-cond);
  font-weight: 700;
  font-size: 19px;
  letter-spacing: .01em;
  margin-bottom: 4px;
}

.page-about .about-cta-d {
  display: block;
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-700);
}

.page-about .about-cta-item:hover .about-cta-d,
.page-about .about-cta-item:focus-visible .about-cta-d {
  color: var(--green-900);
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 34px 0 68px;
  }

  .page-about .about-body {
    padding-top: 52px;
    padding-bottom: 84px;
  }

  .page-about .about-cta {
    grid-template-columns: 1fr 1fr;
  }

  .page-about .about-timeline {
    gap: 6px;
  }

  .page-about .about-timeline-item:nth-child(2) {
    margin-left: 34px;
  }

  .page-about .about-timeline-item:nth-child(3) {
    margin-left: 68px;
  }
}

@media (min-width: 960px) {
  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    gap: 52px;
    align-items: end;
  }

  .page-about .about-hero h1 {
    margin-bottom: 24px;
  }

  .page-about .about-body {
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 56px;
    padding-top: 64px;
    padding-bottom: 104px;
  }

  .page-about .about-index {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-index-list {
    display: block;
  }

  .page-about .about-index-list li {
    border-bottom: 1px solid var(--line-ink-soft);
  }

  .page-about .about-index-link {
    display: flex;
    justify-content: flex-start;
    padding: 9px 0;
  }

  .page-about .about-section {
    padding-top: 48px;
  }

  .page-about .about-figure {
    margin-top: 34px;
  }

  .page-about .about-figure--wide {
    margin-right: 40px;
  }
}

@media (min-width: 1180px) {
  .page-about .about-text p {
    font-size: 16px;
  }

  .page-about .about-team-desc {
    max-width: 46em;
  }
}