.page-about {
  --about-edge: rgba(44, 232, 224, 0.3);
  --about-soft: rgba(232, 238, 246, 0.8);
  --about-dim: rgba(232, 238, 246, 0.62);
  display: block;
  background: var(--ink);
  color: var(--fog);
  overflow-x: hidden;
}

.page-about section + section {
  border-top: 1px solid rgba(26, 35, 48, 0.85);
}

.page-about .about-open,
.page-about .about-source,
.page-about .about-roles,
.page-about .about-partners,
.page-about .about-system,
.page-about .about-data,
.page-about .about-contact,
.page-about .about-next {
  position: relative;
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about .about-track {
  position: relative;
  padding: 0 0 clamp(56px, 8vw, 96px);
}

.page-about .breadcrumb {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .breadcrumb__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  font-size: 13px;
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: rgba(232, 238, 246, 0.35);
}

.page-about .breadcrumb__link {
  color: var(--about-dim);
  text-decoration: none;
  transition: color 160ms var(--ease);
}

.page-about .breadcrumb__link:hover {
  color: var(--cyan);
}

/* ---------- 开场 ---------- */

.page-about .about-open::before {
  content: "";
  position: absolute;
  top: -160px;
  left: -12%;
  width: 640px;
  height: 640px;
  background: radial-gradient(circle, rgba(122, 77, 255, 0.16), rgba(122, 77, 255, 0) 68%);
  pointer-events: none;
}

.page-about .about-open__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  align-items: end;
}

.page-about .about-open__eyebrow {
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin: 0 0 18px;
}

.page-about .about-open__title {
  margin: 0;
  font-size: clamp(34px, 7vw, 66px);
  font-weight: 900;
  line-height: 1.12;
  letter-spacing: -0.025em;
  color: var(--fog);
  text-shadow: 0 0 26px rgba(44, 232, 224, 0.16);
}

.page-about .about-open__title .hl {
  background: linear-gradient(96deg, var(--cyan), var(--violet));
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
  -webkit-text-fill-color: transparent;
}

.page-about .about-open__lede {
  margin: 24px 0 0;
  max-width: 42ch;
  font-size: clamp(16px, 1.8vw, 19px);
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-open__side {
  border-left: 1px solid var(--line);
  padding-left: 20px;
}

.page-about .about-open__since {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-open__since-val {
  margin: 8px 0 0;
  font-size: 24px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-open__since-note {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--about-dim);
}

/* ---------- 标题组 ---------- */

.page-about .about-head {
  border-left: 2px solid var(--cyan);
  padding-left: 18px;
  margin-bottom: 36px;
}

.page-about .about-head--tight {
  margin-bottom: 22px;
}

.page-about .about-head__index {
  display: block;
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--cyan);
  margin-bottom: 10px;
}

.page-about .about-head__title {
  margin: 0;
  font-size: clamp(25px, 4.2vw, 42px);
  font-weight: 900;
  line-height: 1.22;
  letter-spacing: -0.015em;
  color: var(--fog);
}

.page-about .about-head__note {
  margin: 14px 0 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-dim);
}

/* ---------- 时间轴 ---------- */

.page-about .about-track__intro {
  padding-top: clamp(56px, 8vw, 96px);
}

.page-about .year-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .year-jump__link {
  display: inline-block;
  padding: 6px 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--about-dim);
  border: 1px solid var(--line);
  border-radius: var(--r-pill);
  text-decoration: none;
  transition: color 160ms var(--ease), border-color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .year-jump__link:hover {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .about-track__media {
  display: block;
  margin: clamp(36px, 6vw, 60px) 0 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-2);
}

.page-about .about-track__media .media__img {
  display: block;
  width: 100%;
  height: clamp(220px, 42vw, 460px);
  object-fit: cover;
}

.page-about .media__caption {
  padding: 12px clamp(16px, 4vw, 40px);
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-dim);
  border-top: 1px solid var(--line);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: clamp(36px, 5vw, 56px) 0 0;
  padding: 0;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 48px 34px;
  border-left: 1px solid var(--line);
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 5px;
  width: 9px;
  height: 9px;
  box-sizing: border-box;
  background: var(--ink);
  border: 1px solid var(--cyan);
  transition: transform 180ms var(--ease), background-color 180ms var(--ease), box-shadow 180ms var(--ease);
}

.page-about .timeline__item:hover::before {
  transform: scale(1.6);
  background: var(--cyan);
  box-shadow: 0 0 14px rgba(44, 232, 224, 0.7);
}

.page-about .timeline__year {
  display: inline-block;
  margin-bottom: 12px;
  padding: 2px 9px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  border: 1px solid var(--about-edge);
}

.page-about .timeline__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .timeline__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .timeline__item:target .timeline__title {
  color: var(--cyan);
}

.page-about .timeline__item:target::before {
  background: var(--cyan);
  box-shadow: 0 0 16px rgba(44, 232, 224, 0.75);
}

/* ---------- 内容来源 ---------- */

.page-about .about-source__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: start;
}

.page-about .about-source__p {
  margin: 0 0 22px;
  max-width: 40ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .about-source__p--tail {
  margin-top: 22px;
  margin-bottom: 0;
  font-size: 14.5px;
  color: var(--about-dim);
}

.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  align-items: baseline;
  gap: 12px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-soft);
}

.page-about .about-steps__no {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--violet);
}

.page-about .about-source__media,
.page-about .about-partners__media {
  position: relative;
  margin: 0;
  border: 1px solid var(--line);
  background: var(--ink-2);
  overflow: hidden;
}

.page-about .about-source__media .media__img,
.page-about .about-partners__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-source__media:hover,
.page-about .about-partners__media:hover {
  border-color: var(--about-edge);
}

/* ---------- 团队分工 ---------- */

.page-about .roles {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .roles__item {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr);
  column-gap: 16px;
  padding: 24px 10px 24px 6px;
  border-bottom: 1px solid var(--line);
  transition: background-color 180ms var(--ease);
}

.page-about .roles__item:hover {
  background: rgba(44, 232, 224, 0.045);
}

.page-about .roles__num {
  grid-column: 1;
  grid-row: 1;
  padding-top: 5px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .roles__name {
  grid-column: 2;
  grid-row: 1;
  margin: 0 0 8px;
  font-size: clamp(18px, 2.2vw, 21px);
  font-weight: 800;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .roles__desc {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-soft);
}

/* ---------- 合作伙伴 ---------- */

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}

.page-about .about-partners__p {
  margin: 0 0 18px;
  max-width: 44ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-soft);
}

.page-about .partner-points {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .partner-points__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-dim);
}

/* ---------- 内容体系 ---------- */

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

.page-about .about-system__sub {
  margin: 0 0 18px;
  font-size: 14px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .cats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .cats__item {
  padding: 9px 20px;
  font-size: 15px;
  color: var(--fog);
  background: rgba(11, 16, 24, 0.75);
  border: 1px solid var(--line);
  transition: border-color 160ms var(--ease), color 160ms var(--ease), background-color 160ms var(--ease);
}

.page-about .cats__item:hover {
  border-color: var(--cyan);
  color: var(--cyan);
  background: rgba(44, 232, 224, 0.06);
}

.page-about .about-system__hint {
  margin: 20px 0 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .packs {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .packs__row {
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .packs__row dt {
  font-size: 16px;
  font-weight: 800;
  color: var(--fog);
  margin-bottom: 4px;
}

.page-about .packs__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--about-dim);
}

.page-about .about-system__strip {
  margin-top: clamp(36px, 5vw, 56px);
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .strip__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 22px 24px;
  background: var(--ink-2);
}

.page-about .strip__num {
  font-size: clamp(22px, 3vw, 28px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .strip__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-dim);
}

/* ---------- 数据档案 ---------- */

.page-about .about-data__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 40px;
  align-items: center;
}

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

.page-about .growth {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .growth rect {
  transition: opacity 180ms var(--ease);
}

.page-about .growth rect:hover {
  opacity: 0.7;
}

.page-about .about-data__caption {
  margin-top: 14px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-dim);
}

.page-about .about-data__list {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-data__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 8px 16px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-data__row dt {
  font-size: 15px;
  color: var(--about-dim);
}

.page-about .about-data__row dd {
  margin: 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--fog);
}

/* ---------- 联系 ---------- */

.page-about .about-contact__panel {
  position: relative;
  padding: clamp(28px, 5vw, 56px);
  border: 1px solid var(--line);
  background: linear-gradient(150deg, rgba(44, 232, 224, 0.08), rgba(122, 77, 255, 0.06) 58%, rgba(5, 7, 12, 0) 100%);
  overflow: hidden;
}

.page-about .about-contact__panel::after {
  content: "";
  position: absolute;
  right: -90px;
  bottom: -90px;
  width: 320px;
  height: 320px;
  background: radial-gradient(circle, rgba(44, 232, 224, 0.15), rgba(44, 232, 224, 0) 70%);
  pointer-events: none;
}

.page-about .contact-rows {
  position: relative;
  margin: 30px 0 0;
  border-top: 1px solid rgba(26, 35, 48, 0.9);
}

.page-about .contact-rows__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 5px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(26, 35, 48, 0.9);
}

.page-about .contact-rows__row dt {
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .contact-rows__row dd {
  margin: 0;
  font-size: 16px;
  line-height: 1.7;
  color: var(--fog);
  word-break: break-word;
}

.page-about .about-contact__note {
  position: relative;
  margin: 26px 0 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-dim);
}

.page-about .about-contact__link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(44, 232, 224, 0.45);
  transition: border-color 160ms var(--ease), color 160ms var(--ease);
}

.page-about .about-contact__link:hover {
  color: var(--mist);
  border-bottom-color: var(--mist);
}

/* ---------- 下一步 ---------- */

.page-about .next-links {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .next-links__link {
  display: grid;
  grid-template-columns: 44px minmax(0, 1fr) 24px;
  align-items: center;
  gap: 16px;
  padding: 22px 8px;
  border-bottom: 1px solid var(--line);
  text-decoration: none;
  color: var(--fog);
  transition: background-color 160ms var(--ease), color 160ms var(--ease), padding-left 160ms var(--ease);
}

.page-about .next-links__link:hover,
.page-about .next-links__link:focus-visible {
  background: rgba(44, 232, 224, 0.06);
  color: var(--cyan);
  padding-left: 18px;
}

.page-about .next-links__no {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan);
}

.page-about .next-links__text {
  font-size: 16px;
  line-height: 1.65;
}

.page-about .next-links__arrow {
  font-size: 18px;
  text-align: right;
  transition: transform 160ms var(--ease);
}

.page-about .next-links__link:hover .next-links__arrow {
  transform: translateX(4px);
}

/* ---------- 断点 ---------- */

@media (min-width: 640px) {
  .page-about .contact-rows__row {
    grid-template-columns: 150px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }

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

@media (min-width: 900px) {
  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 56px;
  }

  .page-about .about-source__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 56px;
  }

  .page-about .about-partners__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
  }

  .page-about .about-system__grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 48px;
  }

  .page-about .about-data__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: 56px;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 120px minmax(0, 1fr);
    column-gap: 28px;
    padding-left: 40px;
  }

  .page-about .timeline__year {
    grid-column: 1;
    grid-row: 1;
    justify-self: start;
    align-self: start;
    margin-bottom: 0;
  }

  .page-about .timeline__title {
    grid-column: 2;
    grid-row: 1;
    margin-bottom: 12px;
  }

  .page-about .timeline__text {
    grid-column: 2;
    grid-row: 2;
  }
}

@media (min-width: 1024px) {
  .page-about .about-open__title {
    transform: rotate(-1.2deg);
    transform-origin: left center;
  }

  .page-about .about-partners__media {
    transform: translateY(-16px);
  }
}

@media (max-width: 480px) {
  .page-about .about-open__title {
    font-size: 30px;
    letter-spacing: -0.015em;
  }

  .page-about .next-links__link {
    grid-template-columns: 34px minmax(0, 1fr) 20px;
    gap: 12px;
  }
}