.page-about {
  background: var(--cream);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--navy);
  color: var(--cream);
  padding: calc(var(--header-h) + 56px) 0 clamp(56px, 7vw, 88px);
  overflow: hidden;
}

.page-about .about-hero .breadcrumb__link {
  color: rgba(255, 247, 236, 0.68);
}

.page-about .about-hero .breadcrumb__link:hover {
  color: var(--orange-soft);
}

.page-about .about-hero .breadcrumb__current {
  color: var(--orange-soft);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 40px;
  margin-top: 34px;
}

.page-about .about-hero__eyebrow {
  color: var(--orange);
}

.page-about .about-hero__title {
  font-family: var(--font-title);
  font-weight: 900;
  font-size: clamp(34px, 6vw, 64px);
  line-height: 1.1;
  letter-spacing: -0.03em;
  margin: 14px 0 22px;
  color: var(--cream);
}

.page-about .about-hero__lede {
  max-width: 46ch;
  color: rgba(255, 247, 236, 0.8);
  font-size: clamp(16px, 1.6vw, 18px);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}

.page-about .about-hero__rot {
  display: none;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  background: rgba(201, 194, 182, 0.22);
  border: 1px solid rgba(201, 194, 182, 0.22);
}

.page-about .about-stats__item {
  background: rgba(255, 255, 255, 0.035);
  padding: 18px 16px 20px;
}

.page-about .about-stats dt {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: rgba(255, 247, 236, 0.58);
}

.page-about .about-stats dd {
  margin: 8px 0 0;
  font-family: var(--font-title);
  font-size: 14px;
  color: rgba(255, 247, 236, 0.86);
}

.page-about .about-stats__num {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(26px, 3.2vw, 34px);
  letter-spacing: -0.02em;
  color: var(--orange);
  margin-right: 6px;
}

/* ---------- 通用区块节奏 ---------- */
.page-about .section {
  padding: clamp(56px, 7.5vw, 108px) 0;
}

.page-about h2 {
  font-family: var(--font-title);
  font-weight: 800;
  font-size: clamp(26px, 3.6vw, 40px);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin: 10px 0 20px;
}

.page-about h3 {
  font-family: var(--font-title);
  font-weight: 700;
  font-size: clamp(19px, 2vw, 23px);
  line-height: 1.35;
  margin: 0 0 10px;
}

.page-about .eyebrow {
  margin: 0;
}

.page-about .prose {
  margin: 0 0 18px;
}

.page-about .figure {
  margin: 0;
}

.page-about .figure__media {
  overflow: hidden;
  border: 1px solid var(--line);
  border-radius: var(--radius);
}

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

.page-about .figure__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  background: var(--cream);
}

.page-about .about-origin__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-origin__aside {
  margin: 24px 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--orange);
  font-size: 15px;
  line-height: 1.75;
  color: var(--stone);
}

/* ---------- 工作方法 ---------- */
.page-about .about-method__lede {
  max-width: 52ch;
}

.page-about .about-method__list {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  display: grid;
  gap: 26px;
}

.page-about .about-method__item {
  border-top: 2px solid var(--line);
  padding-top: 20px;
}

.page-about .about-method__item:nth-child(1) {
  border-top-color: var(--orange);
}

.page-about .about-method__item:nth-child(2) {
  border-top-color: var(--clay);
}

.page-about .about-method__item:nth-child(3) {
  border-top-color: var(--moss);
}

.page-about .about-method__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
  margin-bottom: 12px;
}

.page-about .about-method__item:nth-child(2) .about-method__num {
  color: var(--clay);
}

.page-about .about-method__item:nth-child(3) .about-method__num {
  color: var(--moss);
}

.page-about .about-method__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  background: var(--cream);
}

.page-about .about-teams__lede {
  max-width: 54ch;
}

.page-about .about-teams__grid {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-teams__item {
  background: var(--cream);
  padding: 26px 22px 28px;
  position: relative;
}

.page-about .about-teams__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 34px;
  background: var(--orange);
}

.page-about .about-teams__num {
  display: block;
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--stone);
  margin-bottom: 10px;
}

.page-about .about-teams__title {
  margin-bottom: 10px;
}

.page-about .about-teams__desc {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--stone);
}

.page-about .about-teams__meta {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--clay);
}

/* ---------- 版本演进 ---------- */
.page-about .about-versions {
  background: var(--navy-deep);
  color: var(--cream);
}

.page-about .about-versions__eyebrow {
  color: var(--orange);
}

.page-about .about-versions__title {
  color: var(--cream);
}

.page-about .about-versions__lede {
  max-width: 52ch;
  color: rgba(255, 247, 236, 0.78);
}

.page-about .about-versions__grid {
  display: grid;
  gap: 48px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 44px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(180deg, var(--orange) 0%, rgba(201, 194, 182, 0.3) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 40px 34px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 107, 53, 0.18);
}

.page-about .about-timeline__meta {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mint);
}

.page-about .about-timeline__title {
  color: var(--cream);
  margin-bottom: 10px;
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 247, 236, 0.76);
  max-width: 52ch;
}

.page-about .about-fold {
  margin-top: 16px;
  border-top: 1px solid rgba(201, 194, 182, 0.24);
}

.page-about .about-fold__summary {
  list-style: none;
  cursor: pointer;
  padding: 12px 0 4px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

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

.page-about .about-fold__summary::after {
  content: "+";
  margin-left: 8px;
}

.page-about .about-fold[open] .about-fold__summary::after {
  content: "–";
}

.page-about .about-fold__body {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(255, 247, 236, 0.66);
  max-width: 52ch;
}

.page-about .about-versions__figure .figure__media {
  border-color: rgba(201, 194, 182, 0.28);
}

.page-about .about-versions__figure .figure__caption {
  color: rgba(255, 247, 236, 0.58);
}

/* ---------- 合作生态 ---------- */
.page-about .about-eco__grid {
  display: grid;
  gap: 40px;
}

.page-about .about-eco__points {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-eco__point {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-eco__point:last-child {
  border-bottom: none;
}

.page-about .about-eco__point-num {
  flex: 0 0 auto;
  min-width: 62px;
  font-family: var(--font-mono);
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--clay);
}

.page-about .about-eco__point-text {
  font-size: 15px;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--cream);
  padding-bottom: clamp(64px, 9vw, 128px);
}

.page-about .about-next__panel {
  position: relative;
  background: var(--sand);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  padding: clamp(28px, 4vw, 52px);
  overflow: hidden;
}

.page-about .about-next__panel::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--orange) 0%, var(--mint) 100%);
}

.page-about .about-next__lead h2 {
  margin-bottom: 16px;
}

.page-about .about-next__lede {
  max-width: 56ch;
  color: var(--stone);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-next__more {
  margin: 22px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--stone);
}

.page-about .about-next__link {
  color: var(--ink);
  border-bottom: 1px solid var(--orange);
  padding-bottom: 1px;
}

.page-about .about-next__link:hover {
  color: var(--orange);
}

/* ---------- 媒体查询 ---------- */
@media (min-width: 760px) {
  .page-about .about-teams__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 360px);
    gap: 72px;
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 72px;
    align-items: start;
  }

  .page-about .about-method__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 28px;
    align-items: start;
  }

  .page-about .about-method__item:nth-child(2) {
    margin-top: 42px;
  }

  .page-about .about-method__item:nth-child(3) {
    margin-top: 84px;
  }

  .page-about .about-versions__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 64px;
    align-items: start;
  }

  .page-about .about-versions__figure {
    position: sticky;
    top: calc(var(--header-h) + 40px);
  }

  .page-about .about-eco__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 64px;
    align-items: center;
  }

  .page-about .about-eco__figure {
    order: -1;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__rot {
    display: block;
    position: absolute;
    top: calc(var(--header-h) + 108px);
    right: max(18px, calc((100vw - var(--maxw)) / 2 - 44px));
    writing-mode: vertical-rl;
    font-size: 11px;
    letter-spacing: 0.32em;
    color: rgba(255, 107, 53, 0.72);
    pointer-events: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before {
    box-shadow: none;
  }
}