.page-about {
  --about-hero-glow: radial-gradient(120% 80% at 14% -10%, rgba(63, 232, 192, 0.12), transparent 58%);
  --about-warm: radial-gradient(90% 70% at 100% 0%, rgba(255, 138, 61, 0.08), transparent 60%);
  color: var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(34px, 6vw, 72px);
  background-image: var(--about-warm), var(--about-hero-glow);
  background-color: var(--night);
  overflow: hidden;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 40px);
}

.page-about .about-hero__copy {
  display: flex;
  flex-direction: column;
  gap: clamp(14px, 2.2vw, 20px);
}

.page-about .about-hero__copy .display-title {
  margin: 0;
  max-width: 15ch;
  line-height: 1.04;
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: 46ch;
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 10px;
  margin: clamp(6px, 1.4vw, 14px) 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 12px 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, rgba(17, 44, 37, 0.9), rgba(10, 31, 26, 0.55));
}

.page-about .about-stat .stat-big {
  font-size: clamp(22px, 5vw, 30px);
  line-height: 1.05;
  color: var(--cyan);
}

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

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

/* ---------- 主体 ---------- */
.page-about .about-body {
  padding-top: clamp(30px, 5vw, 56px);
  padding-bottom: clamp(40px, 7vw, 90px);
}

.page-about .rail-nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 8px;
  scrollbar-width: none;
}

.page-about .rail-nav::-webkit-scrollbar {
  display: none;
}

.page-about .rail-nav__title {
  display: none;
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .rail-nav__link {
  flex: 0 0 auto;
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 9px 16px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  color: var(--muted);
  text-decoration: none;
  font-size: 14px;
  white-space: nowrap;
  transition: color .2s ease, border-color .2s ease, background-color .2s ease;
}

.page-about .rail-nav__link:hover,
.page-about .rail-nav__link:focus-visible {
  color: var(--ink);
  border-color: var(--cyan-line);
  background-color: var(--cyan-soft);
}

.page-about .rail-nav__link.is-in {
  color: var(--ink);
  border-color: var(--cyan-line);
  background-color: rgba(63, 232, 192, 0.07);
}

.page-about .rail-nav__year {
  color: var(--cyan);
  font-size: 13px;
}

.page-about .rail-main {
  display: flex;
  flex-direction: column;
  gap: clamp(38px, 6vw, 74px);
  min-width: 0;
}

.page-about .about-section {
  position: relative;
  padding-top: clamp(18px, 3vw, 28px);
  border-top: 1px solid var(--line);
}

.page-about .about-section::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 0;
  width: 56px;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), transparent);
}

.page-about .about-section .section__head {
  margin-bottom: clamp(14px, 2.4vw, 22px);
}

.page-about .about-section .section-title {
  margin: 6px 0 0;
  max-width: 20ch;
  line-height: 1.14;
}

.page-about .about-section > p {
  margin: 0 0 12px;
  max-width: 62ch;
  color: var(--ink-soft);
}

/* ---------- 年份时间轴 ---------- */
.page-about .about-timeline {
  margin-top: clamp(18px, 3vw, 28px);
}

.page-about .about-timeline .timeline__time {
  display: inline-block;
  min-width: 52px;
  color: var(--orange);
}

.page-about .about-timeline .timeline__text {
  max-width: 56ch;
}

/* ---------- 团队比例条 ---------- */
.page-about .team-bars {
  display: flex;
  flex-direction: column;
  gap: 16px;
  margin-top: clamp(18px, 3vw, 26px);
}

.page-about .team-bar {
  padding: 14px 16px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--panel);
}

.page-about .team-bar__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin: 0 0 10px;
  font-size: 14px;
}

.page-about .team-bar__name {
  color: var(--ink);
}

.page-about .team-bar__num {
  color: var(--cyan);
  font-size: 18px;
}

.page-about .team-bar__track {
  margin: 0;
  height: 8px;
  border-radius: var(--pill);
  background: rgba(30, 66, 56, 0.85);
  overflow: hidden;
}

.page-about .team-bar__track i {
  display: block;
  width: var(--w, 0%);
  height: 100%;
  border-radius: var(--pill);
  background: linear-gradient(90deg, var(--cyan-deep), var(--cyan));
  transform-origin: left center;
  transform: scaleX(0);
  transition: transform .7s cubic-bezier(.22, .8, .28, 1);
}

.page-about .team-bar.is-in .team-bar__track i {
  transform: scaleX(1);
}

.page-about .about-note-list {
  margin: clamp(16px, 2.6vw, 24px) 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .about-note-list li {
  position: relative;
  padding-left: 20px;
  color: var(--muted);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-note-list li::before {
  content: "";
  position: absolute;
  top: 0.62em;
  left: 0;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--cyan);
  opacity: .85;
}

/* ---------- 数据流程 ---------- */
.page-about .about-pipeline {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  align-items: start;
}

.page-about .about-pipeline .figure-frame {
  margin: 0;
}

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

.page-about .about-pipeline__copy > p {
  margin: 0 0 16px;
  color: var(--ink-soft);
  max-width: 60ch;
}

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

.page-about .pipeline-steps li {
  display: grid;
  grid-template-columns: 44px 1fr;
  gap: 12px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .pipeline-steps__num {
  color: var(--cyan);
  font-size: 14px;
  padding-top: 2px;
}

.page-about .pipeline-steps strong {
  display: block;
  color: var(--ink);
  font-size: 15px;
  letter-spacing: .01em;
  margin-bottom: 4px;
}

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

/* ---------- 用户画像 ---------- */
.page-about .about-users {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  align-items: start;
}

.page-about .about-users__copy > p {
  margin: 0 0 14px;
  color: var(--ink-soft);
  max-width: 58ch;
}

.page-about .about-user-stats {
  display: grid;
  gap: 10px;
  margin: clamp(16px, 2.6vw, 24px) 0 0;
}

.page-about .about-user-stats > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 12px 14px;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--panel);
}

.page-about .about-user-stats .stat-big {
  font-size: clamp(18px, 4vw, 22px);
  color: var(--ink);
}

.page-about .about-user-stats .stat-big--accent {
  color: var(--orange);
}

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

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

/* ---------- 合作与认可 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 14px;
  margin-top: clamp(16px, 2.6vw, 24px);
}

.page-about .partner-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 20px 20px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, var(--panel), rgba(13, 38, 32, 0.6));
  transition: border-color .25s ease, transform .25s ease;
}

.page-about .partner-card:hover {
  border-color: var(--cyan-line);
  transform: translateY(-3px);
}

.page-about .partner-card--accent {
  background: linear-gradient(180deg, rgba(255, 138, 61, 0.1), rgba(13, 38, 32, 0.55));
  border-color: rgba(255, 138, 61, 0.35);
}

.page-about .partner-card .pill {
  align-self: flex-start;
}

.page-about .partner-card__num {
  margin: 0;
  font-size: clamp(34px, 8vw, 48px);
  line-height: 1;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .partner-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(18px, 3.6vw, 22px);
  line-height: 1.24;
  color: var(--orange);
}

.page-about .partner-card__text {
  margin: 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.72;
}

/* ---------- 服务承诺 ---------- */
.page-about .about-service {
  display: grid;
  gap: clamp(18px, 3vw, 28px);
  align-items: start;
}

.page-about .about-service__copy > p {
  margin: 0 0 12px;
  color: var(--ink-soft);
  max-width: 58ch;
}

.page-about .about-service__links {
  display: grid;
  gap: 10px;
}

.page-about .link-chip {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: var(--panel);
  color: var(--ink);
  text-decoration: none;
  font-size: 15px;
  transition: border-color .2s ease, background-color .2s ease, color .2s ease;
}

.page-about .link-chip:hover,
.page-about .link-chip:focus-visible {
  border-color: var(--cyan);
  background: var(--cyan-soft);
  color: var(--cyan);
}

.page-about .link-chip__key {
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: .08em;
}

.page-about .link-chip:hover .link-chip__key,
.page-about .link-chip:focus-visible .link-chip__key {
  color: var(--ink);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }

  .page-about .about-pipeline {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
  }

  .page-about .about-users {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
  }

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

  .page-about .partner-card:nth-child(2) {
    margin-top: 22px;
  }

  .page-about .partner-card:nth-child(3) {
    margin-top: 44px;
  }

  .page-about .about-service {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
  }

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

  .page-about .about-user-stats > div {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
  }
}

@media (min-width: 1024px) {
  .page-about .rail-layout {
    display: grid;
    grid-template-columns: var(--rail) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .rail-aside {
    position: sticky;
    top: calc(var(--header-h) + 22px);
    align-self: start;
  }

  .page-about .rail-nav {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
    border-left: 1px solid var(--line);
  }

  .page-about .rail-nav__title {
    display: block;
    padding-left: 16px;
  }

  .page-about .rail-nav__link {
    border: 0;
    border-radius: 0;
    border-left: 2px solid transparent;
    margin-left: -1px;
    padding: 10px 12px 10px 16px;
    justify-content: flex-start;
    background: transparent;
  }

  .page-about .rail-nav__label {
    color: inherit;
  }

  .page-about .rail-nav__link:hover,
  .page-about .rail-nav__link:focus-visible {
    background: transparent;
    border-left-color: var(--cyan-deep);
  }

  .page-about .rail-nav__link.is-in {
    background: transparent;
    border-left-color: var(--cyan);
    color: var(--cyan);
  }

  .page-about .about-timeline .timeline__item {
    padding-left: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .team-bar__track i {
    transform: scaleX(1);
    transition: none;
  }

  .page-about .partner-card:hover {
    transform: none;
  }
}
</main>

.page-about {
  --w: 1rem;
}