.page-about {
  --about-line: var(--ink-600);
  --about-soft: rgba(39, 64, 95, 0.55);
  --about-paper-muted: rgba(27, 39, 53, 0.76);
  --about-rail: 3.25rem;
  background: var(--ink-950);
  color: var(--text-100);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 1rem;
  padding-bottom: 0.25rem;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(1.75rem, 5vw, 4rem) 0 clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 1.25rem;
}

.page-about .about-hero__rail {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--text-400);
}

.page-about .about-hero__dot {
  flex: none;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--signal-500);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, 0.18);
}

.page-about .about-hero__rule {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--signal-500), rgba(39, 64, 95, 0));
}

.page-about .about-hero__since {
  flex: none;
  white-space: nowrap;
}

.page-about .about-hero__title {
  margin: 0.5rem 0 0;
  max-width: 22ch;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.85rem, 6.4vw, 3.5rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper-50);
}

.page-about .about-hero__lead {
  margin: 1.25rem 0 0;
  max-width: 62ch;
  font-size: clamp(1rem, 2.3vw, 1.125rem);
  line-height: 1.8;
  color: var(--text-100);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 2rem 0 0;
  padding: 1.5rem 0 0;
  border-top: 1px solid var(--about-line);
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(8.5rem, 1fr));
  gap: 1.25rem;
}

.page-about .about-hero__stats .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.9rem, 7vw, 2.75rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.01em;
  font-variant-numeric: tabular-nums;
  color: var(--signal-500);
}

.page-about .about-hero__stats li:nth-child(2) .stat__value {
  color: var(--flow-500);
}

.page-about .about-hero__stats li:nth-child(3) .stat__value {
  color: var(--paper-50);
}

.page-about .about-hero__stats .stat__label {
  display: block;
  margin-top: 0.625rem;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-400);
}

.page-about .about-hero__actions {
  margin-top: 2rem;
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

/* ---------- 通用图片容器 ---------- */
.page-about .image-frame {
  border: 1px solid var(--about-line);
  background: var(--ink-800);
  overflow: hidden;
}

.page-about .image-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05);
}

/* ---------- 标签页基础 ---------- */
.page-about .tab {
  appearance: none;
  background: transparent;
  border: 0;
  cursor: pointer;
  color: var(--text-400);
  font-family: var(--font-head);
  transition: color 0.2s ease, background 0.2s ease;
}

.page-about .tab:hover {
  color: var(--paper-50);
}

.page-about .tab:focus-visible {
  outline: 2px solid var(--signal-500);
  outline-offset: 2px;
}

.page-about [data-tab-panel][hidden] {
  display: none;
}

/* ---------- 发展阶段 ---------- */
.page-about .about-era {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-era__head {
  max-width: 44rem;
}

.page-about .about-era__figure {
  margin: 1.75rem 0 2.5rem;
}

.page-about .about-era__tablist {
  position: relative;
  display: flex;
  gap: 1.75rem;
  overflow-x: auto;
  scrollbar-width: none;
  border-bottom: 1px solid var(--about-line);
}

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

.page-about .about-era__tab {
  position: relative;
  flex: 0 0 auto;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.15rem;
  padding: 1.35rem 0.25rem 1rem;
  text-align: left;
}

.page-about .about-era__tab::before {
  content: "";
  position: absolute;
  left: 0.25rem;
  top: 0.6rem;
  width: 0.5rem;
  height: 0.5rem;
  border-radius: 50%;
  background: var(--ink-600);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-era__tab::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 2px;
  background: transparent;
  transition: background 0.2s ease;
}

.page-about .about-era__tab[aria-selected="true"] {
  color: var(--paper-50);
}

.page-about .about-era__tab[aria-selected="true"]::before {
  background: var(--signal-500);
  box-shadow: 0 0 0 4px rgba(255, 107, 44, 0.18);
}

.page-about .about-era__tab[aria-selected="true"]::after {
  background: var(--signal-500);
}

.page-about .about-era__tab-year {
  font-family: var(--font-mono);
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
}

.page-about .about-era__tab-name {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--text-400);
}

.page-about .about-era__tab[aria-selected="true"] .about-era__tab-name {
  color: var(--signal-500);
}

.page-about .about-era__panel {
  display: grid;
  gap: 1.25rem;
  padding: clamp(1.5rem, 4vw, 2.75rem) 0 0;
}

.page-about .about-era__year {
  display: flex;
  align-items: baseline;
  gap: 0.5rem;
  font-family: var(--font-mono);
}

.page-about .about-era__year b {
  font-size: clamp(1.75rem, 5vw, 2.25rem);
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--signal-500);
}

.page-about .about-era__year span {
  font-size: 0.8125rem;
  letter-spacing: 0.08em;
  color: var(--text-400);
}

.page-about :is(.about-era__body, .about-standards__item, .about-record__panel, .about-creds__text, .about-eco__card, .about-why__panel) p {
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-100);
}

.page-about h3 {
  margin: 0 0 0.75rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.125rem, 3.2vw, 1.5rem);
  line-height: 1.3;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .about-era__list {
  list-style: none;
  margin: 1.25rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.625rem;
}

.page-about .about-era__list li {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--text-400);
}

.page-about .about-era__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.75em;
  width: 0.6rem;
  height: 1px;
  background: var(--flow-500);
}

/* ---------- 三条标准 ---------- */
.page-about .about-standards {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-standards__head {
  max-width: 46rem;
}

.page-about .about-standards__list {
  list-style: none;
  margin: 2rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-standards__item {
  background: var(--ink-800);
  border: 1px solid var(--about-line);
  border-top: 3px solid var(--signal-500);
  padding: 1.5rem;
  transition: transform 0.22s ease, border-color 0.22s ease;
}

.page-about .about-standards__item:nth-child(2) {
  border-top-color: var(--flow-500);
}

.page-about .about-standards__item:nth-child(3) {
  border-top-color: var(--text-400);
}

.page-about .about-standards__item:hover {
  transform: translateY(-4px);
  border-color: var(--signal-500);
}

.page-about .about-standards__index {
  display: block;
  margin-bottom: 0.75rem;
  font-family: var(--font-mono);
  font-size: 2.75rem;
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: rgba(255, 107, 44, 0.32);
}

.page-about .about-standards__item:nth-child(2) .about-standards__index {
  color: rgba(47, 191, 143, 0.32);
}

.page-about .about-standards__item:nth-child(3) .about-standards__index {
  color: rgba(147, 167, 192, 0.32);
}

.page-about .about-standards__where {
  margin: 0 !important;
  padding-top: 1rem;
  border-top: 1px dashed var(--about-line);
  font-family: var(--font-mono);
  font-size: 0.8125rem !important;
  line-height: 1.6 !important;
  letter-spacing: 0.04em;
  color: var(--text-400) !important;
}

/* ---------- 团队与培训 ---------- */
.page-about .about-team {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-team__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-team__text p {
  max-width: 60ch;
  margin: 0 0 1rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--text-100);
}

.page-about .about-team__facts {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.875rem 1rem;
}

.page-about .about-team__facts li {
  border-left: 2px solid var(--flow-500);
  padding: 0.2rem 0 0.2rem 0.75rem;
}

.page-about .about-team__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.625rem;
  font-weight: 700;
  line-height: 1.1;
  font-variant-numeric: tabular-nums;
  color: var(--paper-50);
}

.page-about .about-team__lab {
  display: block;
  margin-top: 0.3rem;
  font-size: 0.8125rem;
  line-height: 1.5;
  color: var(--text-400);
}

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

/* ---------- 从业记录 ---------- */
.page-about .about-record {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-record__head {
  max-width: 46rem;
}

.page-about .about-record__tablist {
  display: inline-flex;
  flex-wrap: wrap;
  margin-top: 1.75rem;
  border: 1px solid var(--about-line);
  background: var(--ink-800);
}

.page-about .about-record__tab {
  flex: 0 0 auto;
  padding: 0.75rem 1.5rem;
  font-size: 0.9375rem;
  letter-spacing: 0.06em;
  border-right: 1px solid var(--about-line);
}

.page-about .about-record__tab:last-child {
  border-right: 0;
}

.page-about .about-record__tab[aria-selected="true"] {
  background: var(--signal-500);
  color: var(--ink-950);
}

.page-about .about-record__panel {
  margin-top: 1.75rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--about-line);
  max-width: 66ch;
}

.page-about .about-record__panel p {
  margin: 0;
}

/* ---------- 资质与荣誉 ---------- */
.page-about .about-creds {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-creds__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-creds__text p {
  max-width: 60ch;
}

.page-about .about-creds__tags {
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem;
}

.page-about .about-creds__tags li {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.5rem 0.875rem;
  border: 1px solid var(--about-line);
  background: var(--ink-800);
  color: var(--text-100);
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  cursor: default;
  transition: border-color 0.2s ease, color 0.2s ease, background 0.2s ease;
}

.page-about .about-creds__tags li::before {
  content: "";
  display: block;
  width: 0.45rem;
  height: 1px;
  background: var(--flow-500);
}

.page-about .about-creds__tags li:hover {
  border-color: var(--signal-500);
  background: var(--ink-950);
  color: var(--paper-50);
}

.page-about .about-creds__tags li:hover::before {
  background: var(--signal-500);
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-eco {
  padding: clamp(2.5rem, 7vw, 5rem) 0;
  border-top: 1px solid var(--about-soft);
}

.page-about .about-eco__head {
  max-width: 46rem;
}

.page-about .about-eco__grid {
  margin-top: 2rem;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-eco__card {
  padding: 1.5rem;
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--signal-500);
  background: linear-gradient(180deg, rgba(20, 37, 60, 0.92), var(--ink-950));
}

.page-about .about-eco__card:nth-child(2) {
  border-left-color: var(--flow-500);
}

.page-about .about-eco__card:nth-child(3) {
  border-left-color: var(--ember-600);
}

.page-about .about-eco__num {
  display: block;
  margin-bottom: 0.5rem;
  font-family: var(--font-mono);
  font-size: clamp(2.25rem, 7vw, 2.875rem);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  color: var(--signal-500);
}

.page-about .about-eco__card:nth-child(2) .about-eco__num {
  color: var(--flow-500);
}

.page-about .about-eco__card:nth-child(3) .about-eco__num {
  color: var(--paper-50);
}

.page-about .about-eco__num--text {
  font-size: clamp(1.5rem, 5vw, 1.875rem);
  letter-spacing: 0.04em;
}

.page-about .about-eco__card p {
  margin: 0;
}

/* ---------- 收尾 ---------- */
.page-about .about-why {
  padding: clamp(2.5rem, 7vw, 5rem) 0 clamp(3rem, 8vw, 6rem);
}

.page-about .about-why__panel {
  padding: clamp(1.75rem, 5vw, 3.25rem);
  background: var(--paper-50);
  color: var(--ink-on-paper);
  border: 1px solid var(--paper-200);
  box-shadow: 6px 6px 0 rgba(39, 64, 95, 0.55);
}

.page-about .about-why__panel .section-kicker {
  color: var(--ember-600);
}

.page-about .about-why__panel .section-title {
  color: var(--ink-on-paper);
  max-width: 30ch;
}

.page-about .about-why__panel p {
  color: var(--about-paper-muted);
}

.page-about .about-why__list {
  counter-reset: why;
  list-style: none;
  margin: 1.75rem 0 0;
  padding: 0;
  display: grid;
  gap: 1.25rem;
}

.page-about .about-why__list li {
  counter-increment: why;
  position: relative;
  padding-left: 3rem;
}

.page-about .about-why__list li::before {
  content: "0" counter(why);
  position: absolute;
  left: 0;
  top: 0.15rem;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--ember-600);
}

.page-about .about-why__list strong {
  display: block;
  margin-bottom: 0.35rem;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: 1.0625rem;
  letter-spacing: -0.01em;
  color: var(--ink-on-paper);
}

.page-about .about-why__list span {
  display: block;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--about-paper-muted);
}

.page-about .about-why__actions {
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--paper-200);
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
}

.page-about .about-why__panel .button--ghost {
  color: var(--ink-on-paper);
  border-color: rgba(27, 39, 53, 0.35);
}

.page-about .about-why__more {
  margin: 1.5rem 0 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--about-paper-muted) !important;
}

.page-about .about-why__more a {
  color: var(--ember-600);
  text-decoration: underline;
  text-underline-offset: 0.2em;
}

.page-about .about-why__more a:hover {
  color: var(--ink-on-paper);
}

/* ---------- 进入视口显现 ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(12px);
  transition: opacity 0.4s ease-out, transform 0.4s ease-out;
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

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

/* ---------- 窄屏补充 ---------- */
@media (max-width: 419px) {
  .page-about .about-hero__stats {
    grid-template-columns: 1fr;
  }

  .page-about .about-team__facts {
    grid-template-columns: 1fr;
  }
}

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

  .page-about .about-why__panel {
    box-shadow: 10px 10px 0 rgba(39, 64, 95, 0.55);
  }
}

/* ---------- 桌面：时间轴主导的非对称网格 ---------- */
@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: 2.5rem;
    align-items: stretch;
  }

  .page-about .about-hero__rail {
    flex-direction: column;
    align-items: flex-start;
    justify-content: flex-start;
    padding-top: 0.4rem;
  }

  .page-about .about-hero__rule {
    width: 1px;
    height: auto;
    flex: 1 1 auto;
    min-height: 6rem;
    background: linear-gradient(180deg, var(--signal-500), rgba(39, 64, 95, 0));
  }

  .page-about .about-hero__since {
    writing-mode: vertical-rl;
    text-orientation: mixed;
    letter-spacing: 0.3em;
    padding-bottom: 0.5rem;
  }

  .page-about .about-era__panel {
    grid-template-columns: 6.5rem minmax(0, 1fr);
    gap: 2.75rem;
  }

  .page-about .about-era__year {
    flex-direction: column;
    align-items: flex-start;
    gap: 0.25rem;
  }

  .page-about .about-standards__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.75rem;
    align-items: start;
  }

  .page-about .about-standards__item:nth-child(2) {
    margin-top: 1.75rem;
  }

  .page-about .about-standards__item:nth-child(3) {
    margin-top: 3.5rem;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-creds__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 0.55fr);
    gap: 3rem;
    align-items: start;
  }

  .page-about .about-eco__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.5rem;
  }
}

/* ---------- 宽屏呼吸 ---------- */
@media (min-width: 1180px) {
  .page-about .about-hero {
    padding-top: 4.5rem;
    padding-bottom: 4rem;
  }

  .page-about .about-hero__stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    max-width: 42rem;
  }

  .page-about .about-eco__card {
    padding: 1.75rem;
  }
}
<<<END>>>