.page-about {
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  --about-rule: #D7E2F0;
  --about-tint: #E4ECF6;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(84px, 12vw, 136px) 0 clamp(72px, 10vw, 104px);
  background:
    radial-gradient(1000px 520px at 86% -12%, rgba(41, 224, 210, 0.18), transparent 62%),
    radial-gradient(780px 460px at -6% 118%, rgba(255, 122, 47, 0.13), transparent 64%),
    linear-gradient(164deg, var(--deep) 0%, var(--abyss) 100%);
  color: var(--white);
}

.page-about .about-hero__glow {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(36, 69, 110, 0.45) 1px, transparent 1px),
    linear-gradient(90deg, rgba(36, 69, 110, 0.45) 1px, transparent 1px);
  background-size: 96px 96px, 96px 96px;
  -webkit-mask-image: radial-gradient(circle at 72% 18%, #000 0%, transparent 72%);
  mask-image: radial-gradient(circle at 72% 18%, #000 0%, transparent 72%);
}

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

.page-about .about-hero .breadcrumb {
  color: var(--mist);
  font-size: 13px;
}

.page-about .about-hero .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--cyan);
}

.page-about .about-sep {
  margin: 0 8px;
  color: var(--line);
}

.page-about .about-hero .eyebrow {
  margin-top: 26px;
  color: var(--cyan);
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.16em;
}

.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: clamp(34px, 7.4vw, 72px);
  line-height: 1.08;
  max-width: 15em;
}

.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 36em;
  color: var(--mist);
  font-size: clamp(16px, 1.7vw, 18px);
  line-height: 1.78;
}

.page-about .about-facts {
  margin: 38px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut-lg)) 0, 100% var(--cut-lg), 100% 100%, var(--cut-lg) 100%, 0 calc(100% - var(--cut-lg)));
}

.page-about .about-facts__item {
  background: rgba(20, 58, 102, 0.72);
  padding: 18px 20px;
}

.page-about .about-facts dt {
  font-family: var(--font-ui);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-facts dd {
  margin: 8px 0 0;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: clamp(20px, 3.4vw, 26px);
  color: var(--white);
}

.page-about .about-facts .num {
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-hero__actions {
  margin-top: 34px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__edge {
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 54px;
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  padding: clamp(56px, 7.5vw, 92px) 0;
}

.page-about .about-section--tint {
  background: var(--about-tint);
}

.page-about .about-section--deep {
  background: linear-gradient(178deg, var(--deep) 0%, var(--abyss) 100%);
  color: var(--white);
}

.page-about .about-grid {
  display: grid;
  gap: 18px;
}

.page-about .about-num {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(44px, 8vw, 76px);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

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

.page-about .about-h2 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 3.6vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-section--deep .about-h2 {
  color: var(--white);
}

.page-about .about-content p {
  margin: 0 0 16px;
  max-width: 38em;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-section--deep .about-content p {
  color: var(--mist);
}

/* ---------- 起点要点 ---------- */
.page-about .about-points {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-points__item {
  background: #FFFFFF;
  padding: 20px;
  display: grid;
  gap: 8px;
}

.page-about .about-points__k {
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 15px;
  color: var(--deep);
  padding-left: 14px;
  position: relative;
}

.page-about .about-points__k::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 6px;
  height: 6px;
  background: var(--orange);
  transform: rotate(45deg);
}

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

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 4px 0 32px;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  background: var(--navy);
  clip-path: polygon(0 0, calc(100% - var(--cut-lg)) 0, 100% var(--cut-lg), 100% 100%, 0 100%);
}

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

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 8px 0 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 10px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, rgba(41, 224, 210, 0.55) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 30px 40px;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  border: 2px solid var(--orange);
  background: var(--orange);
  box-shadow: 0 0 0 0 rgba(255, 122, 47, 0);
  transition: box-shadow 0.4s var(--ease), background-color 0.4s var(--ease), border-color 0.4s var(--ease);
}

.page-about .about-timeline__item.is-visible::before {
  background: var(--paper);
  border-color: var(--orange);
  box-shadow: 0 0 0 7px rgba(255, 122, 47, 0.16);
}

.page-about .about-section--tint .about-timeline__item.is-visible::before {
  background: var(--about-tint);
}

.page-about .about-timeline__year {
  margin: 0 0 6px;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 14px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: clamp(17px, 2.2vw, 20px);
  color: var(--ink);
}

.page-about .about-timeline__item p {
  margin: 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ink-soft);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: 28px;
  margin-top: 26px;
}

.page-about .about-bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 22px;
}

.page-about .about-bars__head {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  font-family: var(--font-ui);
}

.page-about .about-bars__label {
  font-weight: 600;
  font-size: 15px;
  color: var(--ink);
}

.page-about .about-bars__value {
  font-size: 14px;
  font-weight: 600;
  color: var(--ink-soft);
}

.page-about .about-bars__track {
  margin-top: 9px;
  height: 12px;
  background: var(--about-rule);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, calc(100% - 8px) 100%, 0 100%);
}

.page-about .about-bars__fill {
  display: block;
  height: 100%;
  transition: filter 0.24s var(--ease);
}

.page-about .about-bars__fill--tech {
  width: 100%;
  background: linear-gradient(90deg, #16B7AC, var(--cyan));
}

.page-about .about-bars__fill--service {
  width: 87.5%;
  background: linear-gradient(90deg, #1E8C9E, var(--cyan-soft));
}

.page-about .about-bars__fill--content {
  width: 62.5%;
  background: linear-gradient(90deg, var(--orange), var(--orange-soft));
}

.page-about .about-bars__fill--biz {
  width: 33.3%;
  background: linear-gradient(90deg, #C9761F, var(--orange-soft));
}

.page-about .about-bars__row:hover .about-bars__fill {
  filter: brightness(1.12) saturate(1.1);
}

.page-about .about-bars__note {
  margin: 8px 0 0;
  font-size: 13px;
  line-height: 1.65;
  color: var(--ink-soft);
}

/* ---------- 服务网络指标 ---------- */
.page-about .about-metrics {
  margin: 26px 0 30px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut-lg)) 0, 100% var(--cut-lg), 100% 100%, var(--cut-lg) 100%, 0 calc(100% - var(--cut-lg)));
}

.page-about .about-metrics__item {
  background: rgba(20, 58, 102, 0.7);
  padding: 20px 18px;
}

.page-about .about-metrics__value {
  display: block;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: clamp(24px, 4vw, 32px);
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-metrics__label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--mist);
}

/* ---------- 会员等级 ---------- */
.page-about .about-tabs {
  margin-top: 30px;
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .about-tabs .tabs__tab {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 15px;
  padding: 10px 20px;
  border: 1px solid var(--about-rule);
  background: #FFFFFF;
  color: var(--ink-soft);
  cursor: pointer;
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: background-color 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-tabs .tabs__tab:hover {
  border-color: var(--cyan);
  color: var(--deep);
}

.page-about .about-tabs .tabs__tab[aria-selected="true"] {
  background: var(--deep);
  border-color: var(--deep);
  color: var(--white);
}

.page-about .about-tabs .tabs__panel {
  background: #FFFFFF;
  border: 1px solid var(--about-rule);
  padding: 24px 22px 26px;
  clip-path: polygon(0 0, calc(100% - var(--cut-lg)) 0, 100% var(--cut-lg), 100% 100%, var(--cut-lg) 100%, 0 calc(100% - var(--cut-lg)));
}

.page-about .about-tier__ladder {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 6px;
  margin-bottom: 22px;
}

.page-about .about-tier__blk {
  height: 8px;
  background: var(--about-rule);
}

.page-about .about-tier__blk.is-on {
  background: var(--cyan);
}

.page-about .about-tier__blk.is-on:last-child {
  background: var(--orange);
}

.page-about .about-tier__top {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.page-about .about-tier__name {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(20px, 2.8vw, 26px);
  color: var(--ink);
}

.page-about .about-tier__desc {
  margin: 12px 0 16px;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-tier__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-tier__list li {
  position: relative;
  padding-left: 22px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  background: var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
}

/* ---------- 注册入口 ---------- */
.page-about .about-join {
  margin-top: 30px;
  padding: 26px 22px;
  background: linear-gradient(140deg, var(--navy) 0%, var(--deep) 100%);
  color: var(--white);
  clip-path: polygon(0 0, calc(100% - var(--cut-lg)) 0, 100% var(--cut-lg), 100% 100%, var(--cut-lg) 100%, 0 calc(100% - var(--cut-lg)));
}

.page-about .about-join__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(19px, 2.6vw, 24px);
  color: var(--white);
}

.page-about .about-join__main p {
  margin: 0 0 20px;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.78;
  color: var(--mist);
}

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

.page-about .about-details {
  margin-top: 22px;
  border-top: 1px solid var(--line);
  padding-top: 16px;
}

.page-about .about-details summary {
  cursor: pointer;
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 15px;
  color: var(--cyan);
  list-style: none;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-details summary::-webkit-details-marker {
  display: none;
}

.page-about .about-details summary::before {
  content: "";
  width: 8px;
  height: 8px;
  border-right: 2px solid var(--cyan);
  border-bottom: 2px solid var(--cyan);
  transform: rotate(-45deg);
  transition: transform 0.2s var(--ease);
}

.page-about .about-details[open] summary::before {
  transform: rotate(45deg);
}

.page-about .about-details__body {
  padding-top: 14px;
}

.page-about .about-details__body p {
  margin: 0;
  max-width: 38em;
  font-size: 14px;
  line-height: 1.8;
  color: var(--mist);
}

/* ---------- 合作生态 ---------- */
.page-about .about-cols {
  list-style: none;
  margin: 26px 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-cols__item {
  background: #FFFFFF;
  padding: 22px 20px;
}

.page-about .about-cols__title {
  margin: 0 0 10px;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 16px;
  color: var(--deep);
}

.page-about .about-cols__item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

.page-about .about-link-line {
  margin: 22px 0 0;
}

.page-about .about-text-link {
  font-family: var(--font-ui);
  font-weight: 600;
  font-size: 15px;
  color: var(--deep);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 2px;
}

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

/* ---------- 路线图 ---------- */
.page-about .about-roadmap {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 18px;
}

.page-about .about-roadmap__item {
  padding: 22px 20px;
  background: #FFFFFF;
  border: 1px solid var(--about-rule);
  border-left: 4px solid var(--cyan);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-roadmap__no {
  margin: 0 0 10px;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 22px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-roadmap__title {
  margin: 0 0 10px;
  font-family: var(--font-ui);
  font-weight: 700;
  font-size: 17px;
  color: var(--ink);
}

.page-about .about-roadmap__item p:last-child {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ink-soft);
}

/* ---------- 结尾行动条 ---------- */
.page-about .about-cta {
  padding: clamp(48px, 6vw, 72px) 0;
  background:
    radial-gradient(720px 340px at 8% 0%, rgba(41, 224, 210, 0.16), transparent 66%),
    linear-gradient(120deg, var(--deep) 0%, var(--abyss) 100%);
  color: var(--white);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 26px;
  align-items: center;
}

.page-about .about-cta__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 34em;
  font-size: 15px;
  line-height: 1.8;
  color: var(--mist);
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

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

  .page-about .about-tabs .tabs__panel {
    padding: 30px 30px 34px;
  }

  .page-about .about-join {
    padding: 32px 30px;
  }
}

@media (min-width: 900px) {
  .page-about .about-grid {
    grid-template-columns: 120px minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .about-num {
    font-size: 80px;
    padding-top: 6px;
  }

  .page-about .about-content {
    max-width: 840px;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
    gap: 36px;
    align-items: start;
  }

  .page-about .about-figure--team {
    position: sticky;
    top: 96px;
  }

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

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

  .page-about .about-join {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.85fr);
    gap: 32px;
    align-items: start;
  }

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

@media (min-width: 1180px) {
  .page-about .about-grid {
    grid-template-columns: 140px minmax(0, 1fr);
    gap: 56px;
  }

  .page-about .about-num {
    font-size: 96px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before,
  .page-about .about-bars__fill,
  .page-about .about-details summary::before {
    transition: none;
  }
}