.page-about {
  --about-measure: 720px;
  position: relative;
  padding: 36px 0 88px;
  background:
    radial-gradient(1100px 520px at 92% -6%, rgba(179, 18, 43, 0.26), transparent 62%),
    radial-gradient(900px 480px at -8% 44%, rgba(53, 224, 214, 0.07), transparent 60%);
  overflow-x: clip;
}

.page-about .wrap {
  max-width: 1080px;
  margin-inline: auto;
  padding-inline: 20px;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  max-width: var(--about-measure);
  margin-inline: auto;
  padding-top: 6px;
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 6.2vw, 52px);
  line-height: 1.1;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 14px 0 18px;
}

.page-about .about-hero__lede {
  font-size: clamp(15px, 2.4vw, 18px);
  line-height: 1.9;
  color: var(--grey);
  margin: 0 0 30px;
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 8px;
  padding: 20px 0 0;
  border-top: 1px solid var(--hair);
  display: flex;
  flex-wrap: wrap;
  gap: 16px 32px;
}

.page-about .about-hero__facts li {
  display: flex;
  align-items: baseline;
  gap: 5px;
  font-size: 13px;
  color: var(--grey);
  letter-spacing: 0.03em;
}

.page-about .about-hero__facts em {
  font-style: normal;
}

.page-about .about-num {
  font-family: var(--font-num);
  font-weight: 700;
  font-size: 28px;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-unit {
  font-size: 13px;
  color: var(--grey);
  margin-right: 4px;
}

.page-about .about-banner {
  display: block;
  margin-top: 38px;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--hair);
}

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

/* ---------- 章节骨架与时间线节点 ---------- */

.page-about .section {
  margin-top: 78px;
}

.page-about .about-step {
  position: relative;
  padding-left: 30px;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 10px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(180deg, rgba(53, 224, 214, 0.5), rgba(53, 224, 214, 0.03));
}

.page-about .about-step::after {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--red);
  box-shadow: 0 0 0 5px rgba(179, 18, 43, 0.16);
}

.page-about .section__head {
  max-width: var(--about-measure);
}

.page-about .section__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 4.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  color: var(--white);
  margin: 12px 0 14px;
}

.page-about .section__lede {
  font-size: 16px;
  line-height: 1.9;
  color: var(--grey);
}

@media (min-width: 960px) {
  .page-about .about-step {
    max-width: 980px;
    margin-inline: auto;
    padding-left: 92px;
  }

  .page-about .about-step::before {
    left: 34px;
    top: 14px;
    bottom: 22px;
  }

  .page-about .about-step::after {
    left: 25px;
    top: 8px;
    width: 20px;
    height: 20px;
    box-shadow: 0 0 0 7px rgba(179, 18, 43, 0.16), 0 0 20px rgba(53, 224, 214, 0.45);
  }
}

/* ---------- 服务与人群 ---------- */

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

.page-about .about-serve__card {
  padding: 26px 22px;
  border-radius: var(--r-md);
  background: linear-gradient(158deg, rgba(20, 23, 31, 0.96), rgba(16, 26, 46, 0.86));
  border: 1px solid var(--hair);
  transition: transform 0.28s var(--ease), border-color 0.28s var(--ease);
}

.page-about .about-serve__card:nth-child(2) {
  border-color: rgba(53, 224, 214, 0.22);
}

.page-about .about-serve__card:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 224, 214, 0.42);
}

.page-about .about-serve__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--white);
  margin: 0 0 16px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .about-list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--grey);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--red);
}

.page-about .about-list strong {
  color: var(--white);
  font-weight: 700;
}

/* ---------- 数据能力 ---------- */

.page-about .about-cap {
  margin-top: 30px;
  display: grid;
  gap: 24px;
}

.page-about .about-cap__text p {
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--grey);
}

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

.page-about .about-cap__media {
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--hair);
}

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

@media (min-width: 860px) {
  .page-about .about-cap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
    align-items: center;
    gap: 36px;
  }
}

.page-about .about-band {
  list-style: none;
  margin: 34px 0 0;
  padding: 26px 22px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 16px;
  border-radius: var(--r-lg);
  background: linear-gradient(100deg, rgba(16, 26, 46, 0.94), rgba(20, 23, 31, 0.94));
  border: 1px solid rgba(53, 224, 214, 0.18);
}

.page-about .about-band__item {
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .about-band__val {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-band__unit {
  font-size: 13px;
  color: var(--grey);
}

.page-about .about-band__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--grey);
}

@media (min-width: 720px) {
  .page-about .about-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    padding: 30px 26px;
  }

  .page-about .about-band__item:nth-child(n + 2) {
    padding-left: 20px;
    border-left: 1px solid var(--hair);
  }
}

/* ---------- 内容体系折叠组 ---------- */

.page-about .about-folds {
  margin-top: 28px;
  display: grid;
  gap: 12px;
}

.page-about .about-folds .fold {
  border-radius: var(--r-sm);
  background: rgba(20, 23, 31, 0.74);
  border: 1px solid var(--hair);
  overflow: hidden;
  transition: border-color 0.24s var(--ease);
}

.page-about .about-folds .fold.is-open {
  border-color: rgba(53, 224, 214, 0.4);
}

.page-about .about-folds .fold__trigger {
  width: 100%;
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 17px 20px;
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: var(--white);
}

.page-about .about-folds .fold__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 17px;
  letter-spacing: -0.005em;
}

.page-about .about-folds .fold__hint {
  font-family: var(--font-body);
  font-weight: 400;
  font-size: 13px;
  color: var(--grey);
}

.page-about .about-folds .fold__state {
  margin-left: auto;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-folds .fold__body {
  padding: 0 20px 20px 46px;
  border-left: 2px solid rgba(53, 224, 214, 0.5);
  margin-left: 20px;
}

.page-about .about-folds .fold__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--grey);
}

@media (max-width: 640px) {
  .page-about .about-folds .fold__hint {
    display: none;
  }

  .page-about .about-folds .fold__body {
    padding-left: 22px;
  }
}

/* ---------- 团队与节奏 ---------- */

.page-about .about-team-wrap {
  margin-top: 30px;
  display: grid;
  gap: 28px;
}

.page-about .about-team {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-team__row {
  display: grid;
  gap: 8px;
}

.page-about .about-team__top {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-team__name {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team__count {
  font-family: var(--font-num);
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__track {
  display: block;
  height: 10px;
  border-radius: var(--pill);
  background: rgba(244, 246, 250, 0.07);
  overflow: hidden;
}

.page-about .about-team__bar {
  display: block;
  height: 100%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--red), var(--red-deep));
}

.page-about .about-team__row:nth-child(1) .about-team__bar { width: 28%; }
.page-about .about-team__row:nth-child(2) .about-team__bar { width: 36%; }
.page-about .about-team__row:nth-child(3) .about-team__bar { width: 15%; background: linear-gradient(90deg, var(--orange), rgba(255, 122, 41, 0.35)); }
.page-about .about-team__row:nth-child(4) .about-team__bar { width: 21%; background: linear-gradient(90deg, var(--cyan), rgba(53, 224, 214, 0.3)); }

.page-about .about-team__role {
  margin: 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--grey);
}

.page-about .about-team__media {
  border-radius: var(--r-md);
  overflow: hidden;
  border: 1px solid var(--hair);
}

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

@media (min-width: 900px) {
  .page-about .about-team-wrap {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.92fr);
    align-items: center;
    gap: 40px;
  }
}

.page-about .about-cadence {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-cadence li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 18px;
  padding: 16px 20px;
  background: rgba(20, 23, 31, 0.7);
  border-left: 2px solid rgba(179, 18, 43, 0.7);
}

.page-about .about-cadence__when {
  font-family: var(--font-num);
  font-size: 14px;
  font-weight: 700;
  color: var(--orange);
  min-width: 66px;
}

.page-about .about-cadence__what {
  font-size: 15px;
  line-height: 1.7;
  color: var(--grey);
}

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  margin-top: 30px;
  align-items: center;
}

.page-about .about-eco__ring {
  position: relative;
  width: min(100%, 288px);
  aspect-ratio: 1 / 1;
  margin-inline: auto;
  border-radius: 50%;
  display: grid;
  place-items: center;
  border: 1px solid rgba(53, 224, 214, 0.22);
  background:
    radial-gradient(circle at 50% 50%, rgba(179, 18, 43, 0.32), rgba(179, 18, 43, 0) 68%),
    radial-gradient(circle at 50% 50%, transparent 43%, rgba(53, 224, 214, 0.09) 43%, rgba(53, 224, 214, 0.09) 46%, transparent 46%);
}

.page-about .about-eco__ring::before {
  content: "";
  position: absolute;
  inset: 24%;
  border-radius: 50%;
  border: 1px dashed rgba(53, 224, 214, 0.3);
}

.page-about .about-eco__ring::after {
  content: "";
  position: absolute;
  top: 5%;
  left: 50%;
  transform: translateX(-50%);
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 14px rgba(255, 122, 41, 0.7);
}

.page-about .about-eco__core {
  position: relative;
  text-align: center;
}

.page-about .about-eco__core .about-num {
  font-size: 52px;
  color: var(--white);
}

.page-about .about-eco__unit {
  font-size: 14px;
  color: var(--grey);
  margin-left: 4px;
}

.page-about .about-eco__cap {
  margin: 10px 0 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-eco__title {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 19px;
  color: var(--white);
  margin: 0 0 14px;
}

.page-about .about-honor {
  margin-top: 20px;
  display: flex;
  align-items: flex-start;
  gap: 12px;
  padding: 16px 18px;
  border-radius: var(--r-sm);
  background: rgba(16, 26, 46, 0.8);
  border: 1px solid rgba(255, 122, 41, 0.24);
}

.page-about .about-honor__mark {
  flex: none;
  width: 14px;
  height: 14px;
  margin-top: 3px;
  border-radius: 4px;
  background: linear-gradient(135deg, var(--orange), var(--red));
}

.page-about .about-honor p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--white);
}

/* ---------- 区域与登记信息 ---------- */

.page-about .about-facts {
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  border-radius: var(--r-md);
  overflow: hidden;
}

.page-about .about-facts__row {
  display: grid;
  gap: 6px;
  padding: 16px 20px;
  background: rgba(20, 23, 31, 0.72);
}

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

.page-about .about-facts dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--white);
  word-break: break-word;
}

@media (min-width: 720px) {
  .page-about .about-facts__row {
    grid-template-columns: 160px minmax(0, 1fr);
    gap: 20px;
    align-items: baseline;
  }
}

/* ---------- 后续入口 ---------- */

.page-about .about-next {
  padding: 34px 0 0;
  border-top: 1px solid var(--hair);
  max-width: var(--about-measure);
  margin-inline: auto;
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: 22px;
  color: var(--white);
  margin: 0 0 18px;
}

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

.page-about .about-next__item {
  display: inline-block;
  padding: 10px 18px;
  border-radius: var(--pill);
  border: 1px solid var(--hair);
  background: rgba(20, 23, 31, 0.7);
  color: var(--grey);
  font-size: 14px;
  line-height: 1.5;
  text-decoration: none;
  transition: color 0.22s var(--ease), border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-next__item:hover,
.page-about .about-next__item:focus-visible {
  color: var(--white);
  border-color: rgba(53, 224, 214, 0.5);
  background: rgba(16, 26, 46, 0.9);
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-serve__card,
  .page-about .about-next__item,
  .page-about .about-folds .fold {
    transition: none;
  }

  .page-about .about-serve__card:hover {
    transform: none;
  }
}