.page-about {
  --about-radius: var(--radius-panel);
  --about-gap: 18px;
  display: block;
}

.page-about .about-hero {
  padding: 16px 0 8px;
}

.page-about .about-hero__title {
  font-size: clamp(30px, 6.2vw, 54px);
  line-height: 1.14;
  letter-spacing: -0.02em;
  font-weight: 900;
  margin: 10px 0 16px;
  color: var(--ink);
  max-width: 20ch;
}

.page-about .about-hero__lead {
  font-size: 16px;
  line-height: 1.75;
  color: var(--ink-soft);
  margin: 0;
  max-width: 44ch;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 12px 14px;
  display: flex;
  flex-direction: column;
  gap: 2px;
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .about-stat:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--brand);
}

.page-about .about-stat__label {
  font-size: 13px;
  color: var(--ink-mute);
  letter-spacing: 0.02em;
}

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

/* 章节轨道 */
.page-about .track {
  margin-bottom: 20px;
}

.page-about .track__list {
  list-style: none;
  margin: 0;
  padding: 2px 2px 10px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .track__item {
  flex: 0 0 auto;
}

.page-about .track__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  white-space: nowrap;
  text-decoration: none;
  border-radius: var(--radius-pill);
  border: 1px solid var(--line-strong);
  background: var(--white);
  color: var(--ink-soft);
  font-size: 14px;
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background 160ms var(--ease);
}

.page-about .track__link:hover,
.page-about .track__link:focus-visible {
  border-color: var(--orange);
  color: var(--ink);
  background: var(--paper);
}

.page-about .track__link:focus-visible {
  outline: 2px solid var(--orange);
  outline-offset: 2px;
}

.page-about .track__no {
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  color: var(--brand);
  letter-spacing: 0.06em;
}

/* 章节 */
.page-about .chapters {
  counter-reset: chap;
  min-width: 0;
}

.page-about .chapter {
  counter-increment: chap;
  position: relative;
  background: var(--white);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  padding: 24px 20px;
  margin-bottom: var(--about-gap);
  overflow: hidden;
  scroll-margin-top: 84px;
}

.page-about .chapter--night {
  background: var(--night);
  border-color: var(--night);
  color: var(--on-dark);
}

.page-about .chapter--pine {
  background: var(--pine);
  border-color: var(--pine);
  color: var(--white);
}

.page-about .chapter--wine {
  background: var(--wine);
  border-color: var(--wine);
  color: var(--white);
}

.page-about .chapter__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  margin-bottom: 14px;
}

.page-about .chapter__no {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.08em;
  color: var(--orange);
  line-height: 1;
}

.page-about .chapter__no::before {
  content: counter(chap, decimal-leading-zero);
}

.page-about .chapter--night .chapter__no,
.page-about .chapter--pine .chapter__no,
.page-about .chapter--wine .chapter__no {
  color: var(--amber);
}

.page-about .chapter__title {
  flex: 1 1 auto;
  margin: 0;
  font-size: clamp(25px, 4.8vw, 52px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  font-weight: 900;
  color: inherit;
}

.page-about .chapter__gist {
  flex-basis: 100%;
  margin: 0;
  font-size: 14px;
  line-height: 1.65;
  color: var(--ink-mute);
  transition: color 160ms var(--ease);
}

.page-about .chapter--night .chapter__gist,
.page-about .chapter--pine .chapter__gist,
.page-about .chapter--wine .chapter__gist {
  color: rgba(245, 247, 250, 0.66);
}

.page-about .chapter:hover .chapter__gist,
.page-about .chapter:focus-within .chapter__gist {
  color: var(--orange);
}

.page-about .chapter--night:hover .chapter__gist,
.page-about .chapter--pine:hover .chapter__gist,
.page-about .chapter--wine:hover .chapter__gist {
  color: var(--amber);
}

.page-about .chapter__body > p {
  font-size: 16px;
  line-height: 1.78;
  margin: 0 0 14px;
  color: var(--ink-soft);
}

.page-about .chapter--night .chapter__body > p,
.page-about .chapter--pine .chapter__body > p,
.page-about .chapter--wine .chapter__body > p {
  color: rgba(255, 255, 255, 0.86);
}

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

.page-about .chapter__pull {
  margin: 18px 0 0;
  padding: 16px 18px;
  border-radius: var(--radius-card);
  background: var(--paper);
  border-left: 3px solid var(--brand);
  font-size: 16px;
  font-weight: 600;
  line-height: 1.65;
  color: var(--ink);
}

.page-about .chapter--night .chapter__pull,
.page-about .chapter--pine .chapter__pull,
.page-about .chapter--wine .chapter__pull {
  background: rgba(255, 255, 255, 0.1);
  border-left-color: var(--orange);
  color: var(--white);
}

/* 角色卡 */
.page-about .role-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .role {
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-card);
  padding: 18px;
  transition: border-color 160ms var(--ease), transform 160ms var(--ease);
}

.page-about .chapter--night .role {
  background: rgba(255, 255, 255, 0.07);
  border-color: rgba(255, 255, 255, 0.16);
}

.page-about .role:hover {
  border-color: var(--orange);
  transform: translateY(-2px);
}

.page-about .role__who {
  margin: 0;
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--brand);
}

.page-about .chapter--night .role__who {
  color: var(--brand-soft);
}

.page-about .role__title {
  margin: 6px 0 10px;
  font-size: 19px;
  line-height: 1.3;
  color: var(--ink);
}

.page-about .chapter--night .role__title {
  color: var(--white);
}

.page-about .role__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-soft);
}

.page-about .chapter--night .role__text {
  color: rgba(245, 247, 250, 0.78);
}

/* 时间轴 */
.page-about .timeline {
  list-style: none;
  margin: 22px 0 0;
  padding: 0 0 0 18px;
  border-left: 2px solid rgba(255, 255, 255, 0.22);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 22px 8px;
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -27px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 43, 0.22);
  transition: transform 160ms var(--ease);
}

.page-about .timeline__item:hover::before {
  transform: scale(1.25);
}

.page-about .timeline__when {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 5px 0 6px;
  font-size: 18px;
  line-height: 1.35;
  color: var(--white);
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(255, 255, 255, 0.8);
}

/* 团队 */
.page-about .chapter__metric {
  display: flex;
  align-items: center;
  gap: 14px;
  margin: 0 0 18px;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
}

.page-about .chapter__metric .num {
  font-family: var(--font-mono);
  font-size: clamp(46px, 11vw, 72px);
  font-weight: 700;
  line-height: 1;
  color: var(--brand);
  letter-spacing: -0.03em;
}

.page-about .chapter__metric-label {
  font-size: 14px;
  line-height: 1.6;
  color: var(--ink-mute);
  max-width: 22ch;
}

.page-about .team-split {
  display: grid;
  gap: 20px;
}

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

.page-about .team-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 14px 0;
  border-top: 1px solid var(--line);
}

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

.page-about .team-item__num {
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 700;
  line-height: 1.2;
  color: var(--brand);
}

.page-about .team-item__name {
  margin: 0 0 4px;
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .team-item__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ink-soft);
}

/* 图片 */
.page-about .about-fig {
  margin: 16px 0 18px;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: rgba(255, 255, 255, 0.08);
}

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

.page-about .about-fig--wide {
  margin-top: 4px;
}

.page-about .about-fig--square {
  max-width: 340px;
  margin: 18px 0 0;
}

/* 联系信息 */
.page-about .contact-strip {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .contact-strip li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  padding: 12px 16px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
}

.page-about .contact-strip__key {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--brand);
  font-weight: 700;
}

.page-about .contact-strip__val {
  font-family: var(--font-mono);
  font-size: 14px;
  color: var(--ink);
  word-break: break-all;
}

/* 结尾 */
.page-about .about-cta {
  margin-top: 4px;
  background: var(--indigo);
  color: var(--white);
  border-radius: var(--about-radius);
  padding: 26px 20px;
  display: grid;
  gap: 18px;
}

.page-about .about-cta__title {
  margin: 0 0 8px;
  font-size: clamp(21px, 3.6vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.01em;
  font-weight: 800;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(245, 247, 250, 0.76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

@media (min-width: 768px) {
  .page-about .about-hero {
    padding-top: 24px;
  }

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

  .page-about .chapter {
    padding: 32px 28px;
    margin-bottom: 22px;
  }

  .page-about .role-list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .contact-strip {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .contact-strip li {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
    border-radius: var(--radius-card);
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    padding: 32px 30px;
  }

  .page-about .about-fig--wide {
    margin-bottom: 22px;
  }
}

@media (min-width: 900px) {
  .page-about .team-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 26px;
  }

  .page-about .about-fig--team {
    margin: 0;
  }

  .page-about .about-fig--square {
    max-width: 360px;
    margin-left: auto;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    display: grid;
    grid-template-columns: 210px minmax(0, 1fr);
    gap: 48px;
    align-items: start;
    margin-top: 38px;
  }

  .page-about .track {
    position: sticky;
    top: 40px;
    margin-bottom: 0;
  }

  .page-about .track__list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
    border-left: 2px solid var(--line);
  }

  .page-about .track__item {
    flex: 0 0 auto;
  }

  .page-about .track__link {
    width: 100%;
    padding: 10px 14px;
    border: 0;
    border-radius: 0 var(--radius-pill) var(--radius-pill) 0;
    background: transparent;
    font-size: 14px;
  }

  .page-about .track__link:hover,
  .page-about .track__link:focus-visible {
    background: rgba(27, 91, 214, 0.08);
    border-color: transparent;
  }

  .page-about .chapter {
    padding: 40px 40px 36px;
    scroll-margin-top: 32px;
  }

  .page-about .chapter__body > p {
    max-width: 62ch;
  }

  .page-about .chapter__metric .num {
    font-size: 72px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-body {
    grid-template-columns: 236px minmax(0, 1fr);
    gap: 60px;
  }

  .page-about .chapter {
    padding: 44px 48px 40px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stat,
  .page-about .role,
  .page-about .track__link,
  .page-about .chapter__gist,
  .page-about .timeline__item::before {
    transition: none;
  }

  .page-about .about-stat:hover,
  .page-about .role:hover {
    transform: none;
  }
}