.page-about {
  --about-block-pad: clamp(26px, 4.2vw, 56px);
  --about-flow-gap: clamp(44px, 6vw, 96px);
  --about-text: 15px;
  background: var(--sea);
  color: var(--cream);
  padding-bottom: clamp(56px, 8vw, 112px);
}

.page-about .about-crumb {
  padding-top: clamp(20px, 3vw, 34px);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cream-64);
}

.page-about .about-crumb__link {
  color: var(--cream-64);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 160ms var(--ease), border-color 160ms var(--ease);
}

.page-about .about-crumb__link:hover,
.page-about .about-crumb__link:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

.page-about .about-crumb__here {
  color: var(--cream-80);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(24px, 3.6vw, 44px) 0 clamp(36px, 5vw, 68px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 38px);
}

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

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(32px, 7.4vw, 74px);
  font-weight: 250;
  line-height: 1.08;
  letter-spacing: -0.015em;
  color: var(--cream);
  max-width: 12em;
}

.page-about .about-hero__note {
  padding: clamp(18px, 2.4vw, 26px);
  border-left: 2px solid var(--signal);
}

.page-about .about-hero__lede {
  margin: 0 0 14px;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.9;
  color: var(--cream-80);
}

.page-about .about-hero__hint {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.06em;
  color: var(--cream-64);
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-dark-soft);
  border: 1px solid var(--line-dark-soft);
}

.page-about .about-stats__item {
  background: var(--sea);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 3px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--signal);
}

.page-about .about-stats__item--accent .about-stats__num {
  color: var(--coral);
}

.page-about .about-stats__key {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cream-80);
}

.page-about .about-stats__desc {
  font-size: 11px;
  line-height: 1.6;
  letter-spacing: 0.05em;
  color: var(--cream-64);
}

/* ---------- 主体两栏 ---------- */

.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
}

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

.page-about .about-aside__label {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--cream-64);
}

.page-about .about-aside .index-list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-aside .index-list::-webkit-scrollbar {
  display: none;
}

.page-about .index-list__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  flex: 0 0 auto;
  padding: 8px 12px;
  border: 1px solid var(--line-dark);
  color: var(--cream-64);
  text-decoration: none;
  white-space: nowrap;
  font-size: 13px;
  letter-spacing: 0.04em;
  transition: color 160ms var(--ease), border-color 160ms var(--ease),
    background-color 160ms var(--ease);
}

.page-about .index-list__link:hover,
.page-about .index-list__link:focus-visible {
  color: var(--cream);
  border-color: var(--signal);
}

.page-about .index-list__link[aria-current] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--signal-deep);
}

.page-about .index-list__num {
  font-size: 11px;
  font-weight: 700;
  opacity: 0.8;
}

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

/* ---------- 章节块 ---------- */

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

.page-about .about-block {
  padding: var(--about-block-pad);
  margin-bottom: var(--about-flow-gap);
  border-radius: var(--radius);
}

.page-about .about-block > *:last-child {
  margin-bottom: 0;
}

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

.page-about .about-block--sea {
  background: var(--sea-layer);
  color: var(--cream);
  border: 1px solid var(--line-dark);
}

.page-about .about-block__head {
  margin-bottom: 14px;
}

.page-about .about-block__num {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  margin-bottom: 10px;
  color: var(--sea-layer);
}

.page-about .about-block--sea .about-block__num {
  color: var(--cream-64);
}

.page-about .about-block__title {
  margin: 0;
  font-size: clamp(25px, 4vw, 44px);
  font-weight: 250;
  line-height: 1.14;
  letter-spacing: -0.01em;
}

.page-about .about-block__lede {
  margin: 0 0 20px;
  font-size: clamp(15px, 1.8vw, 17px);
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-block--sea .about-block__lede {
  color: var(--cream-80);
}

.page-about .about-block__body p {
  margin: 0 0 1.1em;
  font-size: var(--about-text);
  line-height: 1.9;
}

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

.page-about .about-block--sea .about-block__body p {
  color: var(--cream-80);
}

/* ---------- 数字条 ---------- */

.page-about .about-figures {
  display: flex;
  flex-wrap: wrap;
  gap: 16px 30px;
  margin: 26px 0 0;
  padding: 18px 0 20px;
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-figure {
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 6px;
}

.page-about .about-figure__num {
  font-size: clamp(23px, 3vw, 32px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--sea-layer);
}

.page-about .about-figure__unit {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
}

/* ---------- 图片 ---------- */

.page-about .about-figure-img {
  margin: 26px 0 0;
}

.page-about .about-figure-img img,
.page-about .about-split__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--line-light);
}

.page-about .about-figure-img__cap,
.page-about .about-split__cap {
  display: block;
  margin-top: 10px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.05em;
  color: var(--stone);
}

/* ---------- 两栏图文 ---------- */

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
}

.page-about .about-split__media {
  margin: 0;
  min-width: 0;
}

.page-about .about-split__media img {
  border-color: var(--line-dark);
}

.page-about .about-split__cap {
  color: var(--cream-64);
}

.page-about .about-callout {
  margin: 20px 0 0;
  padding: 14px 16px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--cream-80);
  border-left: 2px solid var(--coral);
  background: var(--glass);
}

/* ---------- 迭代时间线 ---------- */

.page-about .about-block--graphic {
  position: relative;
  overflow: hidden;
}

.page-about .about-block__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.3;
  filter: saturate(0.55);
  pointer-events: none;
}

.page-about .about-block__inner {
  position: relative;
  z-index: 1;
}

.page-about .about-ticks {
  display: block;
  width: 100%;
  height: 22px;
  margin: 4px 0 22px;
  color: var(--cream-64);
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--terracotta), rgba(196, 116, 79, 0.2));
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 26px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--moss);
  box-shadow: 0 0 0 3px rgba(124, 154, 114, 0.2);
  transition: box-shadow 160ms var(--ease);
}

.page-about .about-timeline__item--now::before {
  background: var(--coral);
  box-shadow: 0 0 0 4px rgba(255, 107, 74, 0.2);
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  box-shadow: 0 0 0 6px rgba(53, 224, 208, 0.22);
}

.page-about .about-timeline__step {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cream-64);
  margin-bottom: 6px;
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: clamp(18px, 2.2vw, 23px);
  font-weight: 700;
  letter-spacing: -0.01em;
  line-height: 1.3;
  color: var(--cream);
  transition: color 160ms var(--ease);
}

.page-about .about-timeline__item:hover .about-timeline__title,
.page-about .about-timeline__item:focus-within .about-timeline__title {
  color: var(--signal);
}

.page-about .about-timeline__text {
  margin: 0;
  font-size: var(--about-text);
  line-height: 1.9;
  color: var(--cream-80);
}

/* ---------- 团队分工 ---------- */

.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 24px;
  background: var(--line-light);
  border-top: 1px solid var(--line-light);
  border-bottom: 1px solid var(--line-light);
}

.page-about .about-role {
  background: var(--cream);
  padding: 20px 0 22px;
}

.page-about .about-role__idx {
  display: block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.16em;
  color: var(--coral);
  margin-bottom: 8px;
}

.page-about .about-role__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-role__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 四条坚持 ---------- */

.page-about .about-tenets {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
}

.page-about .about-tenets__item {
  padding: 20px 0 22px;
  border-top: 1px solid var(--line-dark-soft);
}

.page-about .about-tenets__item:last-child {
  border-bottom: 1px solid var(--line-dark-soft);
}

.page-about .about-tenets__num {
  display: block;
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--signal);
  margin-bottom: 8px;
}

.page-about .about-tenets__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: clamp(18px, 2.2vw, 22px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .about-tenets__text {
  margin: 0;
  font-size: var(--about-text);
  line-height: 1.9;
  color: var(--cream-80);
  max-width: 46em;
}

/* ---------- 联系方式 ---------- */

.page-about .about-contact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  margin-top: 22px;
}

.page-about .about-contact__col {
  padding: 18px 0 0;
  border-top: 2px solid var(--sea-layer);
}

.page-about .about-contact__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: 19px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-contact__text {
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--stone);
}

.page-about .about-contact__btn {
  display: inline-block;
  text-decoration: none;
}

.page-about .about-contact__info {
  margin: 26px 0 0;
  padding: 16px 0 0;
  border-top: 1px solid var(--line-light);
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: 4px 16px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line-light);
}

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

.page-about .about-contact__key {
  flex: 0 0 84px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--stone);
  padding-top: 2px;
}

.page-about .about-contact__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-contact__more {
  margin: 22px 0 0;
  font-size: 13px;
  line-height: 1.9;
  color: var(--stone);
}

/* ---------- 平板与桌面 ---------- */

@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1px 32px;
    border-top: none;
  }

  .page-about .about-role {
    border-top: 1px solid var(--line-light);
  }

  .page-about .about-contact {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 32px;
  }

  .page-about .about-tenets {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 40px;
  }
}

@media (min-width: 900px) {
  .page-about {
    --about-text: 16px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: end;
  }

  .page-about .about-hero__lead {
    grid-column: 1;
  }

  .page-about .about-hero__note {
    grid-column: 2;
    margin-bottom: 6px;
  }

  .page-about .about-stats {
    grid-column: 1 / -1;
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-stats__item:nth-child(even) {
    padding-top: 30px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-contact__info {
    display: grid;
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: 40px;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: minmax(150px, 210px) minmax(0, 1fr);
    gap: clamp(34px, 4.6vw, 72px);
  }

  .page-about .about-aside {
    position: sticky;
    top: 28px;
  }

  .page-about .about-aside .index-list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
    gap: 4px;
  }

  .page-about .index-list__link {
    width: 100%;
    justify-content: flex-start;
    border-color: transparent;
    padding: 8px 10px;
  }

  .page-about .index-list__link:hover,
  .page-about .index-list__link:focus-visible {
    border-color: var(--signal);
  }

  .page-about .about-aside__note {
    display: block;
    margin-top: 24px;
    padding-top: 16px;
    border-top: 1px solid var(--line-dark-soft);
  }

  .page-about .about-aside__note-text {
    margin: 0 0 10px;
    font-size: 13px;
    line-height: 1.8;
    color: var(--cream-64);
  }

  .page-about .about-aside__note-link {
    font-size: 13px;
  }

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

@media (min-width: 1180px) {
  .page-about .about-roles {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 1px 28px;
  }
}