.page-about {
  --about-tint: rgba(15, 61, 46, 0.05);
  --about-hair: rgba(20, 17, 13, 0.14);
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  font-size: 17px;
  line-height: 1.8;
  -webkit-font-smoothing: antialiased;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 22px;
}

.page-about .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--ink-62);
}

.page-about .breadcrumb__item {
  display: inline-flex;
  align-items: center;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin: 0 8px;
  color: var(--ink-40);
}

.page-about .breadcrumb__link {
  color: var(--ink-62);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .breadcrumb__link:hover {
  color: var(--green);
  border-bottom-color: var(--orange);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 0;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--grass);
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  max-width: 17ch;
  font-family: var(--serif);
  font-weight: 700;
  font-size: clamp(32px, 6.6vw, 74px);
  line-height: 1.08;
  letter-spacing: 0.01em;
  color: var(--ink);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 34em;
  font-size: clamp(16px, 2.1vw, 19px);
  line-height: 1.85;
  color: var(--ink-62);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 34px 0 0;
  padding: 1px 0;
  list-style: none;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-stat {
  background: var(--paper);
  padding: 18px 16px 20px;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--mono);
  font-size: clamp(28px, 5.6vw, 44px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--green);
}

.page-about .about-stat__label {
  display: block;
  margin-top: 9px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--ink-62);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 34px 0 0;
}

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

.page-about .about-figure--hero img {
  aspect-ratio: 16 / 7;
}

.page-about .about-figure--inset {
  margin-top: 30px;
}

.page-about .about-figure--inset img {
  aspect-ratio: 10 / 7;
}

.page-about .about-figure__caption {
  margin-top: 10px;
  padding-left: 12px;
  border-left: 2px solid var(--orange);
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-62);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: block;
  padding-top: clamp(44px, 6vw, 76px);
}

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

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-bottom: clamp(48px, 7vw, 88px);
  scroll-margin-top: 150px;
}

.page-about .about-sec__head {
  margin-bottom: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-sec__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-sec__title {
  margin: 0;
  max-width: 22em;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 34px);
  line-height: 1.3;
  letter-spacing: 0.04em;
  color: var(--ink);
}

.page-about .about-sec__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  max-width: 920px;
}

.page-about .about-prose {
  max-width: 36em;
  font-size: 17px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .about-prose p {
  margin: 0 0 1.15em;
}

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

.page-about .about-link {
  color: var(--green);
  text-decoration: none;
  border-bottom: 1px solid var(--orange);
  padding-bottom: 1px;
  transition: color 0.2s ease;
}

.page-about .about-link:hover {
  color: var(--indigo);
}

.page-about .about-note {
  margin: 0;
  padding-left: 14px;
  border-left: 2px solid var(--about-hair);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink-62);
}

/* ---------- 六阶段 ---------- */
.page-about .about-phases {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-phase {
  display: grid;
  grid-template-columns: 62px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 15px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-phase:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-phase__tag {
  font-family: var(--mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--green);
}

.page-about .about-phase__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 18px 0;
  border-top: 1px solid var(--about-hair);
}

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

.page-about .about-team__name {
  margin: 0;
  font-family: var(--sans);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--green);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ink);
}

/* ---------- 版本阶梯 ---------- */
.page-about .about-ladder {
  display: flex;
  align-items: flex-end;
  gap: 8px;
  margin: 0 0 30px;
}

.page-about .about-ladder__col {
  flex: 1 1 0;
  min-width: 0;
  display: flex;
  flex-direction: column;
}

.page-about .about-ladder__barwrap {
  display: flex;
  align-items: flex-end;
  min-height: 132px;
}

.page-about .about-ladder__bar {
  display: block;
  width: 100%;
  height: 40px;
  border-radius: var(--radius);
  background: var(--night);
  transition: background-color 0.22s ease, transform 0.22s ease;
}

.page-about .about-ladder__col:nth-child(1) .about-ladder__bar { height: 40px; }
.page-about .about-ladder__col:nth-child(2) .about-ladder__bar { height: 62px; }
.page-about .about-ladder__col:nth-child(3) .about-ladder__bar { height: 84px; }
.page-about .about-ladder__col:nth-child(4) .about-ladder__bar { height: 106px; }
.page-about .about-ladder__col:nth-child(5) .about-ladder__bar { height: 128px; }

.page-about .about-ladder__col:hover .about-ladder__bar {
  background: var(--orange);
}

.page-about .about-ladder__ver {
  margin-top: 10px;
  font-family: var(--mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-ladder__cap {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--ink-62);
}

.page-about .cap-long {
  display: none;
}

/* ---------- 合作点阵 ---------- */
.page-about .about-partners {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  padding: 22px;
  background: var(--paper-white);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius);
}

.page-about .about-partners__label {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--ink-62);
}

.page-about .about-partners__count {
  font-family: var(--mono);
  font-size: 24px;
  font-weight: 700;
  line-height: 1;
  color: var(--night);
}

.page-about .about-dots {
  display: grid;
  grid-template-columns: repeat(auto-fill, 12px);
  gap: 7px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-dot {
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--indigo);
  transition: transform 0.2s ease;
}

.page-about .about-dots--grass .about-dot {
  background: var(--grass);
}

.page-about .about-partners__group:hover .about-dot {
  transform: scale(1.2);
}

/* ---------- 运营信息 ---------- */
.page-about .about-contact {
  margin: 0 0 clamp(40px, 6vw, 72px);
  padding: clamp(26px, 5vw, 46px);
  background: var(--night);
  color: var(--paper);
  border-radius: var(--radius);
  scroll-margin-top: 150px;
}

.page-about .about-contact__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-contact__title {
  margin: 0 0 14px;
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.3;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .about-contact__lead {
  margin: 0 0 22px;
  max-width: 34em;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--paper-72);
}

.page-about .about-contact__list {
  margin: 0;
  padding: 0;
}

.page-about .about-contact__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 14px 0;
  border-top: 1px solid var(--paper-line);
}

.page-about .about-contact__row:last-child {
  border-bottom: 1px solid var(--paper-line);
}

.page-about .about-contact__row dt {
  margin: 0;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--paper-40);
}

.page-about .about-contact__row dd {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-contact__mono {
  font-family: var(--mono);
  letter-spacing: 0.02em;
}

.page-about .about-copy {
  font-family: var(--sans);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--paper);
  background: transparent;
  border: 1px solid var(--paper-line);
  border-radius: var(--radius);
  padding: 4px 11px;
  cursor: pointer;
  transition: background-color 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-copy:hover {
  background: var(--orange);
  border-color: var(--orange);
  color: var(--paper-white);
}

.page-about .about-copy.is-copied {
  background: var(--grass);
  border-color: var(--grass);
  color: var(--paper-white);
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding: clamp(26px, 4vw, 42px) 0 clamp(48px, 7vw, 90px);
  border-top: 2px solid var(--ink);
}

.page-about .about-next__kicker {
  margin: 0 0 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--orange);
}

.page-about .about-next__text {
  margin: 0 0 22px;
  max-width: 32em;
  font-size: clamp(17px, 2.2vw, 21px);
  line-height: 1.7;
  color: var(--ink);
}

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

.page-about .about-btn {
  letter-spacing: 0.05em;
}

.page-about .about-btn--ghost {
  color: var(--green);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-partners {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 28px;
  }

  .page-about .about-contact__row {
    grid-template-columns: 116px minmax(0, 1fr);
    gap: 20px;
    align-items: center;
  }
}

@media (min-width: 768px) {
  .page-about .about-ladder {
    gap: 12px;
  }

  .page-about .about-ladder__barwrap {
    min-height: 224px;
  }

  .page-about .about-ladder__col:nth-child(1) .about-ladder__bar { height: 74px; }
  .page-about .about-ladder__col:nth-child(2) .about-ladder__bar { height: 110px; }
  .page-about .about-ladder__col:nth-child(3) .about-ladder__bar { height: 146px; }
  .page-about .about-ladder__col:nth-child(4) .about-ladder__bar { height: 182px; }
  .page-about .about-ladder__col:nth-child(5) .about-ladder__bar { height: 218px; }

  .page-about .about-ladder__cap {
    font-size: 13px;
    max-width: 15em;
  }

  .page-about .cap-short {
    display: none;
  }

  .page-about .cap-long {
    display: inline;
  }

  .page-about .about-team {
    grid-template-columns: 168px minmax(0, 1fr);
    gap: 22px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-sec__body:has(.about-note) {
    grid-template-columns: minmax(0, 1fr) 212px;
    gap: clamp(24px, 3vw, 48px);
  }
}

@media (min-width: 1024px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 88px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 130px;
    padding-right: 14px;
    border-right: 1px solid var(--about-hair);
  }

  .page-about .about-rail__label {
    margin: 0 0 14px;
    font-family: var(--mono);
    font-size: 11px;
    letter-spacing: 0.18em;
    color: var(--ink-40);
  }

  .page-about .about-rail__list {
    display: flex;
    flex-direction: column;
    gap: 2px;
    margin: 0;
    padding: 0;
    list-style: none;
  }

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

  .page-about .about-rail__link {
    display: flex;
    align-items: center;
    gap: 8px;
    padding: 8px 0;
    font-size: 12px;
    line-height: 1.4;
    color: var(--ink-62);
    text-decoration: none;
    transition: color 0.22s ease;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link.is-active {
    color: var(--ink);
  }

  .page-about .about-rail__dot {
    flex: 0 0 auto;
    width: 7px;
    height: 7px;
    border-radius: 50%;
    background: var(--ink-40);
    transition: background-color 0.22s ease, transform 0.22s ease;
  }

  .page-about .about-rail__link:hover .about-rail__dot,
  .page-about .about-rail__link.is-active .about-rail__dot {
    background: var(--orange);
    transform: scale(1.3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-ladder__bar,
  .page-about .about-dot,
  .page-about .about-copy,
  .page-about .about-rail__dot {
    transition: none;
  }
}