.page-about {
  --about-dot: 40px;
  --about-line-soft: rgba(167, 139, 250, 0.14);
  --about-body-text: rgba(245, 243, 255, 0.86);
}

.page-about .section {
  padding-block: clamp(44px, 7vw, 88px);
}

.page-about .about-crumb {
  padding-top: clamp(16px, 3vw, 26px);
}

.page-about .about-crumb .breadcrumbs {
  margin: 0;
}

/* ---------- hero ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(26px, 5vw, 56px) 0 clamp(30px, 6vw, 72px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% -12% 20%;
  z-index: -1;
  pointer-events: none;
  background:
    radial-gradient(58% 62% at 14% 22%, rgba(124, 77, 255, 0.34), transparent 72%),
    radial-gradient(48% 54% at 88% 12%, rgba(34, 211, 238, 0.18), transparent 74%),
    radial-gradient(42% 44% at 62% 92%, rgba(245, 185, 66, 0.14), transparent 76%);
}

.page-about .about-hero__title {
  margin: 10px 0 0;
  max-width: 20ch;
  text-wrap: balance;
}

.page-about .about-hero__cols {
  margin-top: clamp(20px, 4vw, 38px);
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

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

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 20px;
  margin: 0;
}

.page-about .about-stats__item {
  border-top: 1px solid var(--line);
  padding-top: 10px;
}

.page-about .about-stats__label {
  margin: 0 0 6px;
  font-size: 0.76rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-stats__num {
  display: flex;
  align-items: baseline;
  gap: 5px;
  margin: 0;
  line-height: 1;
  font-family: var(--font-mono);
  font-size: clamp(1.7rem, 4.4vw, 2.35rem);
  color: var(--text);
}

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

.page-about .about-stats__unit {
  font-family: var(--font-body);
  font-size: 0.78rem;
  color: var(--muted);
}

/* ---------- 通用小标题 ---------- */
.page-about .about-head {
  max-width: 760px;
  margin-bottom: clamp(22px, 4vw, 38px);
}

.page-about .about-head .section-title {
  margin: 8px 0 12px;
}

.page-about .about-head p {
  margin: 0;
  color: var(--muted);
  line-height: 1.7;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
}

.page-about .about-timeline__media {
  margin: 0 0 clamp(24px, 4vw, 44px);
  border-radius: var(--radius);
}

.page-about .about-rail {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-rail::before {
  content: "";
  position: absolute;
  top: 16px;
  bottom: 16px;
  left: calc(var(--about-dot) / 2 - 1px);
  width: 2px;
  background: linear-gradient(180deg, var(--violet) 0%, var(--cyan) 55%, var(--amber) 100%);
  opacity: 0.45;
}

.page-about .about-rail__item {
  display: grid;
  grid-template-columns: var(--about-dot) minmax(0, 1fr);
  gap: 14px;
  margin-bottom: clamp(18px, 3vw, 28px);
}

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

.page-about .about-rail__marker {
  width: var(--about-dot);
  height: var(--about-dot);
  border-radius: 50%;
  display: grid;
  place-items: center;
  background: var(--glass);
  border: 1px solid var(--line-amber);
  color: var(--amber);
  font-family: var(--font-mono);
  font-size: 0.82rem;
  box-shadow: 0 0 0 6px var(--ink);
}

.page-about .about-rail__body {
  border-radius: var(--radius);
  padding: clamp(16px, 3vw, 26px);
  background: var(--glass-soft);
}

.page-about .about-rail__meta {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-size: 0.76rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

.page-about .about-rail__meta .num {
  color: var(--amber);
  font-size: 0.95rem;
  letter-spacing: 0.04em;
}

.page-about .about-rail__title {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: clamp(1.1rem, 2.4vw, 1.45rem);
  line-height: 1.35;
  color: var(--text);
}

.page-about .about-rail__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--about-body-text);
  max-width: 60ch;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 12px 0 0;
  padding: 0;
  display: grid;
  gap: 6px;
}

.page-about .about-rail__list li {
  position: relative;
  padding-left: 16px;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-rail__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 1px;
  background: var(--cyan);
  opacity: 0.85;
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  gap: 14px;
}

.page-about .about-team__col {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--glass-soft);
}

.page-about .about-team__col--a {
  border-top: 2px solid var(--amber);
  background: linear-gradient(165deg, rgba(245, 185, 66, 0.12), rgba(26, 23, 48, 0.72) 62%);
}

.page-about .about-team__col--b {
  border-top: 2px solid var(--cyan);
}

.page-about .about-team__col--c {
  border-top: 2px solid var(--violet);
}

.page-about .about-team__kicker {
  margin: 0;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-team__col--a .about-team__kicker {
  color: var(--amber);
}

.page-about .about-team__col--b .about-team__kicker {
  color: var(--cyan);
}

.page-about .about-team__col--c .about-team__kicker {
  color: var(--violet);
}

.page-about .about-team__title {
  margin: 0;
  font-family: var(--font-title);
  font-size: clamp(1.1rem, 2.2vw, 1.3rem);
  color: var(--text);
}

.page-about .about-team__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--about-body-text);
}

.page-about .about-team__list {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 5px;
}

.page-about .about-team__list li {
  font-size: 0.85rem;
  line-height: 1.6;
  color: var(--muted);
  padding-left: 12px;
  position: relative;
}

.page-about .about-team__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--violet);
  opacity: 0.9;
}

.page-about .about-team__media {
  margin: clamp(18px, 3vw, 30px) 0 0;
  border-radius: var(--radius);
}

/* ---------- 12 步 ---------- */
.page-about .about-steps__grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(158px, 1fr));
  gap: 16px 14px;
}

.page-about .about-step {
  border-top: 2px solid var(--line-amber);
  padding-top: 10px;
}

.page-about .about-step__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.78rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-step__name {
  margin: 4px 0 4px;
  font-family: var(--font-title);
  font-size: 1rem;
  color: var(--text);
}

.page-about .about-step__desc {
  margin: 0;
  font-size: 0.84rem;
  line-height: 1.62;
  color: var(--muted);
}

/* ---------- 编号体系 ---------- */
.page-about .about-code__grid {
  display: grid;
  gap: clamp(20px, 4vw, 44px);
}

.page-about .about-code__media {
  margin: 0;
  border-radius: var(--radius);
}

.page-about .about-code__text .section-title {
  margin: 8px 0 16px;
}

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

.page-about .about-code__row {
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-code__row strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 0.82rem;
  letter-spacing: 0.05em;
  color: var(--amber);
}

.page-about .about-code__row p {
  margin: 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--about-body-text);
}

.page-about .about-status {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin: 18px 0 0;
  padding: 0;
}

.page-about .about-code__note {
  margin: 14px 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--muted);
  max-width: 52ch;
}

/* ---------- 服务团队 ---------- */
.page-about .about-help__inner {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-help__text .section-title {
  margin: 8px 0 14px;
}

.page-about .about-help__text p {
  margin: 0 0 12px;
  color: var(--about-body-text);
  line-height: 1.75;
  max-width: 54ch;
}

.page-about .about-help__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 18px;
}

.page-about .about-contact-card {
  padding: clamp(18px, 3vw, 26px);
  border-radius: var(--radius);
  background: linear-gradient(170deg, rgba(34, 211, 238, 0.1), rgba(26, 23, 48, 0.72) 58%);
  border: 1px solid var(--line-cyan);
}

.page-about .about-contact-list {
  margin: 0;
}

.page-about .about-contact-row {
  padding: 12px 0;
  border-bottom: 1px solid var(--about-line-soft);
}

.page-about .about-contact-row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-contact-row:first-child {
  padding-top: 0;
}

.page-about .about-contact-row dt {
  margin: 0 0 4px;
  font-size: 0.74rem;
  letter-spacing: 0.1em;
  color: var(--muted);
}

.page-about .about-contact-row dd {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

.page-about .about-contact-row .about-contact-row--mono {
  font-family: var(--font-mono);
  font-size: 0.92rem;
}

/* ---------- 下一步 ---------- */
.page-about .about-next__grid {
  display: grid;
  gap: 12px;
}

.page-about .about-next__card {
  display: block;
  padding: clamp(16px, 3vw, 24px);
  border-radius: var(--radius);
  border: 1px solid var(--line);
  background: var(--glass-soft);
  text-decoration: none;
  color: inherit;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about .about-next__card:hover,
.page-about .about-next__card:focus-visible {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .about-next__num {
  font-size: 0.78rem;
  letter-spacing: 0.12em;
  color: var(--amber);
}

.page-about .about-next__title {
  margin: 6px 0 6px;
  font-family: var(--font-title);
  font-size: 1.08rem;
  color: var(--text);
}

.page-about .about-next__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-team__col--a {
    grid-column: 1 / -1;
  }

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

@media (min-width: 900px) {
  .page-about {
    --about-dot: 62px;
  }

  .page-about .about-hero__cols {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }

  .page-about .about-hero__lede {
    font-size: clamp(1rem, 1.4vw, 1.15rem);
  }

  .page-about .about-rail__marker {
    font-size: 1rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: 1.15fr 0.95fr 0.9fr;
    align-items: stretch;
  }

  .page-about .about-team__col--a {
    grid-column: auto;
  }

  .page-about .about-code__grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    align-items: start;
  }

  .page-about .about-help__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: start;
  }

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

@media (min-width: 1120px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px 24px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__card {
    transition: none;
  }

  .page-about .about-next__card:hover,
  .page-about .about-next__card:focus-visible {
    transform: none;
  }
}
<<<END>>>