.page-about {
  --about-radius: var(--radius-lg);
  background: var(--ink-900);
  color: var(--text);
  font-family: var(--font-body);
  padding-top: calc(var(--header-h) + 0.75rem);
  padding-bottom: 1px;
}

.page-about .about-crumbs {
  width: min(100% - 2rem, var(--shell));
  margin-inline: auto;
  padding-block: 0.5rem 0;
}

.page-about .about-crumbs .breadcrumbs {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
}

/* ---------- 首屏分屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(1.5rem, 4vw, 3rem) 0 clamp(2rem, 5vw, 4rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -20% -10% 30% 45%;
  background: radial-gradient(58% 58% at 72% 34%, rgba(0, 229, 255, 0.16), transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  width: min(100% - 2rem, var(--shell));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 3rem);
  align-items: end;
}

.page-about .about-hero__eyebrow {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  margin: 0 0 1rem;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-hero__eyebrow::before {
  content: "";
  width: 28px;
  height: 2px;
  background: var(--cyan);
}

.page-about .about-hero__title {
  margin: 0 0 1.25rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.25rem, 7.4vw, 5.25rem);
  line-height: 0.94;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title span {
  display: block;
  color: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 0 0 1.5rem;
  max-width: 46ch;
  font-size: clamp(0.9375rem, 1.5vw, 1.125rem);
  line-height: 1.78;
  color: var(--text-muted);
}

.page-about .about-hero__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-hero__chips li {
  padding: 0.4rem 0.8rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.05em;
}

.page-about .about-hero__visual {
  position: relative;
  margin: 0;
  min-height: 300px;
  border-radius: var(--about-radius);
  overflow: hidden;
  background: linear-gradient(160deg, var(--graphite), var(--indigo));
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: 100%;
  aspect-ratio: 3 / 4;
  object-fit: cover;
  filter: saturate(0.9) contrast(1.06);
}

.page-about .about-hero__cap {
  position: absolute;
  top: 0.75rem;
  right: 0.75rem;
  margin: 0;
  padding: 0.35rem 0.65rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: rgba(7, 11, 15, 0.78);
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.12em;
  color: var(--pearl);
}

.page-about .about-hero__year {
  position: absolute;
  left: 0.5rem;
  bottom: -0.12em;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(3.5rem, 13vw, 6.5rem);
  line-height: 0.8;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--cyan);
  pointer-events: none;
}

/* ---------- 主体：左侧轴 + 右侧内容流 ---------- */
.page-about .about-body {
  width: min(100% - 2rem, var(--shell));
  margin-inline: auto;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 3vw, 3rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-rail {
  border-top: 1px solid var(--line);
  padding-top: 0.75rem;
}

.page-about .about-rail__kicker {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-rail__list {
  display: flex;
  gap: 0.5rem;
  margin: 0;
  padding: 0 0 0.5rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__list a {
  display: block;
  white-space: nowrap;
  padding: 0.35rem 0.7rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  text-decoration: none;
  color: var(--text-muted);
  transition: color var(--t-fast), border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

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

.page-about .about-sec {
  position: relative;
  padding-block: clamp(1.75rem, 4vw, 3rem);
  border-top: 1px solid var(--line);
  --section-accent: var(--cyan);
  --section-accent-soft: var(--cyan);
}

.page-about #origin { --section-accent: var(--cyan); }
.page-about #season { --section-accent: var(--orange); }
.page-about #team { --section-accent: var(--green); }
.page-about #history { --section-accent: var(--amber); overflow: hidden; border-radius: var(--radius-md); }
.page-about #principles { --section-accent: var(--cyan); }
.page-about #next { --section-accent: var(--green); }

.page-about .about-sec > * {
  position: relative;
  z-index: 1;
}

.page-about .about-sec__eyebrow {
  margin: 0 0 0.7rem;
  font-family: var(--font-mono);
  font-size: var(--fs-eyebrow);
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--section-accent);
}

.page-about .about-sec__title {
  margin: 0 0 1rem;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  line-height: 1.06;
  letter-spacing: -0.01em;
}

.page-about .about-sec__lead {
  margin: 0 0 1.5rem;
  max-width: 60ch;
  font-size: var(--fs-lead);
  line-height: 1.78;
  color: var(--text-muted);
}

.page-about .about-prose p {
  margin: 0 0 1rem;
  max-width: 64ch;
  line-height: 1.85;
}

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

.page-about .about-inline-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 1px;
}

.page-about .about-inline-link:hover {
  color: var(--pearl);
}

/* ---------- 数据条 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 1.75rem 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.page-about .about-stats li {
  background: var(--ink-800);
  padding: 1.15rem 1.25rem;
}

.page-about .about-stats__num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.75rem, 5vw, 2.75rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-stats__label {
  display: block;
  margin-top: 0.55rem;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--text-muted);
}

/* ---------- 四类场景面板 ---------- */
.page-about .about-panels {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
}

.page-about .about-panel {
  padding: 1.15rem 1.2rem 1.35rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, var(--graphite) 0%, var(--ink-800) 100%);
  transition: border-color var(--t-fast), transform var(--t-fast);
}

.page-about .about-panel:hover {
  border-color: var(--section-accent);
  transform: translateY(-2px);
}

.page-about .about-panel__no {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--section-accent);
}

.page-about .about-panel__title {
  margin: 0.4rem 0 0.55rem;
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-panel__text {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--text-muted);
}

.page-about .about-versions {
  margin-top: 1.25rem;
  padding: 0.9rem 1rem;
  border-left: 2px solid var(--orange);
  background: rgba(255, 107, 26, 0.07);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
}

.page-about .about-versions__label {
  margin: 0 0 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.18em;
  color: var(--orange);
}

.page-about .about-versions__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-versions__list li {
  padding: 0.25rem 0.55rem;
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  color: var(--pearl);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  align-items: center;
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--about-radius);
  overflow: hidden;
  background: var(--graphite);
  border: 1px solid var(--line);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

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

.page-about .about-roles li {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.75rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-roles__num {
  flex: 0 0 auto;
  min-width: 2.6rem;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.5rem;
  line-height: 1;
  color: var(--green);
}

.page-about .about-roles__text {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--text-muted);
}

.page-about .about-team__note {
  margin: 1rem 0 0;
  padding-left: 0.9rem;
  border-left: 1px solid var(--line-strong);
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-muted);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history__backdrop {
  position: absolute;
  inset: 0;
  margin: 0;
  z-index: 0;
  opacity: 0.12;
  pointer-events: none;
}

.page-about .about-history__backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-years {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.5rem;
}

.page-about .about-years__link {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
  padding: 0.5rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  text-decoration: none;
  color: var(--text);
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-years__link:hover,
.page-about .about-years__link:focus-visible {
  border-color: var(--amber);
  background: rgba(255, 176, 0, 0.08);
}

.page-about .about-years__label {
  font-family: var(--font-mono);
  font-size: 1rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--amber);
}

.page-about .about-years__tip {
  font-size: 0.6875rem;
  line-height: 1.3;
  color: var(--text-muted);
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height var(--t-base), opacity var(--t-base);
}

.page-about .about-years__link:hover .about-years__tip,
.page-about .about-years__link:focus-visible .about-years__tip {
  max-height: 2.6rem;
  opacity: 1;
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 1.25rem;
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.4rem;
  bottom: 0.8rem;
  width: 2px;
  background: linear-gradient(180deg, var(--cyan), var(--indigo));
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 1.6rem;
  scroll-margin-top: calc(var(--header-h) + 1.5rem);
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1.25rem - 5px);
  top: 0.4rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--amber);
  transition: background var(--t-fast);
}

.page-about .about-timeline__item:target::before,
.page-about .about-timeline__item:hover::before {
  background: var(--amber);
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.18em;
  color: var(--amber);
}

.page-about .about-timeline__body h3 {
  margin: 0.25rem 0 0.4rem;
  font-family: var(--font-display);
  font-size: 1.375rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-muted);
}

/* ---------- 服务原则折叠 ---------- */
.page-about .about-rule {
  margin-bottom: 0.75rem;
  padding: 0.25rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  transition: border-color var(--t-fast), background var(--t-fast);
}

.page-about .about-rule[open] {
  border-color: var(--line-strong);
  background: var(--graphite);
}

.page-about .about-rule__head {
  display: flex;
  align-items: center;
  gap: 0.85rem;
  padding: 0.85rem 0;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-display);
  font-size: 1.0625rem;
  font-weight: 700;
  letter-spacing: 0.01em;
}

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

.page-about .about-rule__head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.25rem;
  line-height: 1;
  color: var(--section-accent);
}

.page-about .about-rule[open] .about-rule__head::after {
  content: "−";
}

.page-about .about-rule__head:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 3px;
}

.page-about .about-rule__no {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.12em;
  color: var(--section-accent);
}

.page-about .about-rule__body {
  padding-bottom: 1rem;
}

.page-about .about-rule__body p {
  margin: 0;
  max-width: 62ch;
  font-size: 0.9375rem;
  line-height: 1.78;
  color: var(--text-muted);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.875rem;
  margin-top: 1.25rem;
}

.page-about .about-next__link {
  display: flex;
  flex-direction: column;
  gap: 0.45rem;
  padding: 1.15rem 1.2rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--ink-800);
  text-decoration: none;
  color: var(--text);
  transition: border-color var(--t-fast), background var(--t-fast), transform var(--t-fast);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--section-accent);
  background: var(--graphite-2);
  transform: translateY(-2px);
}

.page-about .about-next__tag {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.2em;
  color: var(--section-accent);
}

.page-about .about-next__title {
  font-family: var(--font-display);
  font-size: 1.25rem;
  font-weight: 700;
}

.page-about .about-next__text {
  font-size: 0.875rem;
  line-height: 1.65;
  color: var(--text-muted);
}

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

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

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

@media (min-width: 820px) {
  .page-about .about-team {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 2rem;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(2rem, 4vw, 3.5rem);
  }

  .page-about .about-hero__visual {
    min-height: 460px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: clamp(2rem, 3vw, 3.5rem);
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-h) + 1.5rem);
    align-self: start;
    border-top: 0;
    border-left: 1px solid var(--line);
    padding: 0 0 0 1rem;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__list a {
    border-color: transparent;
    border-radius: 0;
    padding: 0.4rem 0;
    font-size: 0.8125rem;
  }

  .page-about .about-rail__list a:hover,
  .page-about .about-rail__list a:focus-visible {
    background: transparent;
    color: var(--cyan);
    border-color: transparent;
  }

  .page-about #history {
    padding-inline: clamp(1rem, 3vw, 2rem);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-panel:hover,
  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible {
    transform: none;
  }
}
<<<END>>>