.page-about {
  --about-panel-pad: clamp(22px, 3.6vw, 48px);
  --about-gap: clamp(18px, 2.6vw, 32px);
}

/* 首屏 */
.page-about .about-hero {
  padding-block: clamp(20px, 3vw, 36px) clamp(40px, 6vw, 88px);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-hero__title {
  font-size: clamp(36px, 7.2vw, 84px);
  font-weight: 200;
  line-height: 1.03;
  letter-spacing: -0.02em;
  margin-block: 14px 0;
}

.page-about .about-hero__title em {
  font-style: normal;
  color: var(--aqua);
}

.page-about .about-hero__lede {
  margin-block: 22px 0;
  max-width: 34em;
  color: var(--pearl);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(26px, 4vw, 40px) 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
  border-top: 1px solid var(--stroke);
  padding-top: 22px;
}

.page-about .about-hero__fact {
  display: grid;
  grid-template-columns: 54px 1fr;
  align-items: baseline;
  gap: 12px;
}

.page-about .about-hero__fact-num {
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.page-about .about-hero__fact-label {
  font-size: 14px;
  color: var(--mist);
  line-height: 1.5;
}

/* 首屏右侧刻度视觉 */
.page-about .about-gauge {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding: clamp(20px, 3vw, 32px);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-lg);
  background:
    radial-gradient(120% 90% at 100% 0%, rgba(43, 232, 196, 0.14), transparent 58%),
    radial-gradient(90% 80% at 0% 100%, rgba(255, 106, 31, 0.14), transparent 60%),
    var(--glass);
}

.page-about .about-gauge__head {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.page-about .about-gauge__tag {
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--mist);
}

.page-about .about-gauge__ticks {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 13px;
}

.page-about .about-gauge__tick {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  align-items: center;
  gap: 12px;
}

.page-about .about-gauge__num {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-gauge__bar {
  position: relative;
  height: 2px;
  border-radius: 2px;
  background: rgba(143, 166, 188, 0.24);
}

.page-about .about-gauge__bar::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 50%;
  height: 2px;
  width: var(--fill, 40%);
  transform: translateY(-50%);
  border-radius: 2px;
  background: rgba(43, 232, 196, 0.7);
}

.page-about .about-gauge__tick--1 .about-gauge__bar { --fill: 22%; }
.page-about .about-gauge__tick--2 .about-gauge__bar { --fill: 38%; }
.page-about .about-gauge__tick--3 .about-gauge__bar { --fill: 54%; }
.page-about .about-gauge__tick--4 .about-gauge__bar { --fill: 68%; }
.page-about .about-gauge__tick--5 .about-gauge__bar { --fill: 82%; }
.page-about .about-gauge__tick--6 .about-gauge__bar { --fill: 100%; }

.page-about .about-gauge__tick--6 .about-gauge__num {
  color: var(--aqua);
}

.page-about .about-gauge__tick--6 .about-gauge__bar::after {
  background: var(--grad-accent);
  box-shadow: 0 0 12px rgba(255, 106, 31, 0.55);
}

.page-about .about-gauge__caption {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--mist);
  margin: 0;
}

/* 时间轴区 */
.page-about .about-timeline {
  position: relative;
  padding-block: clamp(40px, 6vw, 88px);
  background: var(--abyss);
}

.page-about .about-timeline__bg {
  position: absolute;
  inset: 0;
  pointer-events: none;
}

.page-about .about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.26;
}

.page-about .about-timeline__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--abyss) 0%, rgba(4, 16, 28, 0.55) 45%, var(--abyss) 100%);
}

.page-about .about-timeline__inner {
  position: relative;
}

.page-about .about-timeline__head {
  max-width: 42em;
}

.page-about .about-timeline__intro {
  margin-block-start: 14px;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.7;
}

.page-about .about-timeline__layout {
  margin-block-start: clamp(28px, 4vw, 48px);
  display: grid;
  gap: 18px;
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid var(--stroke);
  border-radius: var(--radius-pill);
  color: var(--pearl);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: var(--aqua);
  color: var(--aqua);
  background: rgba(43, 232, 196, 0.08);
  outline: none;
}

.page-about .about-rail__num {
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .about-stages {
  position: relative;
  padding-inline-start: 24px;
}

.page-about .about-stages::before {
  content: "";
  position: absolute;
  inset-block: 8px;
  inset-inline-start: 6px;
  border-inline-start: 1px dashed rgba(143, 166, 188, 0.45);
}

.page-about .about-stage {
  position: relative;
  padding: clamp(20px, 3vw, 34px);
  border: 1px solid var(--stroke);
  border-radius: var(--radius-md);
  background: var(--deep);
  margin-block-end: var(--about-gap);
  scroll-margin-top: calc(var(--header-offset) + 24px);
}

.page-about .about-stage::before {
  content: "";
  position: absolute;
  inset-inline-start: -24px;
  top: 30px;
  width: 9px;
  height: 9px;
  border-radius: 2px;
  transform: rotate(45deg);
  background: var(--aqua);
  box-shadow: 0 0 10px rgba(43, 232, 196, 0.6);
}

.page-about .about-stage:nth-child(even) {
  background: var(--indigo);
}

.page-about .about-stage:last-child {
  margin-block-end: 0;
}

.page-about .about-stage__index {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--orange);
  margin: 0 0 10px;
}

.page-about .about-stage__title {
  font-family: var(--font-display);
  font-size: clamp(19px, 2.4vw, 25px);
  font-weight: 700;
  line-height: 1.25;
  margin: 0 0 12px;
  color: var(--pearl);
}

.page-about .about-stage__text {
  margin: 0;
  color: rgba(243, 247, 251, 0.82);
  font-size: 15px;
  line-height: 1.75;
  max-width: 40em;
}

/* 资料库区 */
.page-about .about-library {
  padding-block: clamp(8px, 2vw, 20px) clamp(40px, 6vw, 80px);
}

.page-about .about-library__panel {
  position: relative;
  padding: var(--about-panel-pad);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(243, 247, 251, 0.14);
  background:
    radial-gradient(110% 90% at 92% 4%, rgba(255, 106, 31, 0.22), transparent 56%),
    linear-gradient(148deg, var(--wine) 0%, #2C0E1E 100%);
  overflow: hidden;
}

.page-about .about-library__panel::before {
  content: "";
  position: absolute;
  inset-inline: -12%;
  top: -22px;
  height: 44px;
  background: var(--abyss);
  transform: rotate(-2deg);
}

.page-about .about-library__head {
  position: relative;
  max-width: 44em;
}

.page-about .about-library__intro {
  margin-block: 14px 0;
  color: rgba(243, 247, 251, 0.85);
  font-size: 16px;
  line-height: 1.75;
}

.page-about .about-tabs {
  position: relative;
  margin-block-start: clamp(26px, 4vw, 40px);
}

.page-about .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  padding-block-end: 18px;
  border-block-end: 1px solid rgba(243, 247, 251, 0.18);
  margin-block-end: 24px;
}

.page-about .tab {
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  padding: 10px 18px;
  border-radius: var(--radius-pill);
  border: 1px solid rgba(243, 247, 251, 0.16);
  background: rgba(4, 16, 28, 0.35);
  color: var(--pearl);
  cursor: pointer;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .tab:hover {
  border-color: rgba(43, 232, 196, 0.6);
}

.page-about .tab[aria-selected="true"] {
  border-color: var(--aqua);
  color: var(--aqua);
  background: rgba(43, 232, 196, 0.12);
}

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

.page-about .about-tabpanel {
  color: rgba(243, 247, 251, 0.88);
}

.page-about .about-tabpanel:focus-visible {
  outline: 2px solid var(--aqua);
  outline-offset: 4px;
  border-radius: var(--radius-sm);
}

.page-about .about-tabpanel__title {
  margin: 0 0 16px;
  color: var(--pearl);
}

.page-about .about-tabpanel__foot {
  margin-block-start: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(243, 247, 251, 0.8);
}

.page-about .about-inline-link {
  color: var(--aqua);
  text-decoration: underline;
  text-underline-offset: 3px;
}

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

.page-about .about-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-list li {
  position: relative;
  padding-inline-start: 22px;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 0.66em;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  transform: rotate(45deg);
  background: var(--aqua);
}

.page-about .about-list strong {
  color: var(--orange-soft);
  font-weight: 700;
}

.page-about .about-team {
  display: grid;
  gap: 20px;
}

.page-about .about-team__figure {
  margin: 0;
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid rgba(243, 247, 251, 0.16);
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 3 / 2;
}

.page-about .about-team__caption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: rgba(243, 247, 251, 0.7);
  background: rgba(4, 16, 28, 0.45);
}

/* 版本编号区 */
.page-about .about-version {
  padding-block: clamp(40px, 6vw, 80px);
}

.page-about .about-version__grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-version__card {
  position: relative;
  margin: 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
  border: 1px solid var(--stroke);
  background: var(--indigo);
}

.page-about .about-version__card img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 1 / 1;
  opacity: 0.9;
}

.page-about .about-version__plate {
  position: absolute;
  inset-inline: 0;
  bottom: 0;
  display: grid;
  gap: 6px;
  padding: clamp(16px, 2.6vw, 26px);
  background: linear-gradient(180deg, rgba(4, 16, 28, 0) 0%, rgba(4, 16, 28, 0.9) 62%);
}

.page-about .about-version__label {
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-version__number {
  font-size: clamp(30px, 6vw, 58px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  background: var(--grad-accent);
  -webkit-background-clip: text;
  background-clip: text;
  color: transparent;
}

.page-about .about-version__card:hover .about-version__number {
  filter: drop-shadow(0 0 14px rgba(255, 106, 31, 0.5));
}

.page-about .about-version__text {
  margin-block: 16px 0;
  font-size: 16px;
  line-height: 1.78;
  color: rgba(243, 247, 251, 0.86);
  max-width: 34em;
}

.page-about .about-version__inline {
  color: var(--aqua);
  font-size: 0.95em;
}

.page-about .about-version__fold {
  margin-block-start: 24px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  background: rgba(10, 32, 54, 0.65);
  padding: 4px 18px;
}

.page-about .about-version__fold .fold__summary {
  padding-block: 14px;
  font-size: 15px;
  font-weight: 600;
  color: var(--pearl);
  cursor: pointer;
}

.page-about .about-version__fold .fold__body {
  padding-block: 4px 18px;
  color: rgba(243, 247, 251, 0.84);
}

.page-about .about-version__fold .about-list li {
  font-size: 14px;
}

.page-about .about-version__actions {
  margin-block-start: 26px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* 完整性报告 */
.page-about .about-report {
  padding-block: 0 clamp(40px, 6vw, 80px);
}

.page-about .about-report__panel {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  padding: var(--about-panel-pad);
  border-radius: var(--radius-lg);
  border: 1px solid var(--stroke);
  background:
    linear-gradient(118deg, rgba(27, 44, 94, 0.9) 0%, rgba(10, 32, 54, 0.92) 60%),
    var(--deep);
}

.page-about .about-report__panel::after {
  content: "";
  position: absolute;
  inset-inline-start: 0;
  top: 22px;
  bottom: 22px;
  width: 3px;
  border-radius: 3px;
  background: var(--grad-accent);
}

.page-about .about-report__text {
  margin-block: 14px 0;
  font-size: 15px;
  line-height: 1.78;
  color: rgba(243, 247, 251, 0.84);
  max-width: 36em;
}

.page-about .about-report__side {
  display: grid;
  gap: 22px;
  align-content: start;
}

.page-about .about-report__figure {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0;
  padding-block-end: 16px;
  border-block-end: 1px solid var(--stroke);
}

.page-about .about-report__figure-num {
  font-size: clamp(44px, 8vw, 72px);
  font-weight: 700;
  line-height: 1;
  color: var(--pearl);
}

.page-about .about-report__figure-label {
  font-size: 13px;
  color: var(--mist);
  line-height: 1.5;
  max-width: 12em;
}

.page-about .about-report__metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-report__metrics li {
  display: grid;
  gap: 4px;
  padding-inline-start: 16px;
  border-inline-start: 1px solid rgba(43, 232, 196, 0.45);
}

.page-about .about-report__metric-name {
  font-size: 14px;
  font-weight: 600;
  color: var(--pearl);
}

.page-about .about-report__metric-note {
  font-size: 13px;
  color: var(--mist);
  line-height: 1.55;
}

.page-about .about-report__cta {
  justify-self: start;
}

/* 出口条 */
.page-about .about-next {
  padding-block: 0 clamp(48px, 7vw, 96px);
}

.page-about .about-next__inner {
  display: grid;
  gap: 24px;
  padding: clamp(22px, 3.4vw, 40px);
  border-radius: var(--radius-lg);
  border: 1px solid var(--stroke);
  background: rgba(4, 16, 28, 0.72);
}

.page-about .about-next__copy p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--mist);
  max-width: 30em;
}

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

.page-about .about-next__link {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 14px 18px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--stroke);
  color: var(--pearl);
  text-decoration: none;
  font-size: 15px;
  line-height: 1.45;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--aqua);
  background: rgba(43, 232, 196, 0.08);
  transform: translateX(2px);
  outline: none;
}

.page-about .about-next__num {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

/* 响应式 */
@media (min-width: 720px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    align-items: start;
    gap: 26px;
  }

  .page-about .about-report__metrics {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px 22px;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    align-items: center;
  }

  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-hero__fact {
    grid-template-columns: 1fr;
    gap: 6px;
  }

  .page-about .about-timeline__layout {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 44px;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: calc(var(--header-offset) + 20px);
  }

  .page-about .about-rail__list {
    flex-direction: column;
    overflow: visible;
    padding: 0;
    border-inline-start: 1px solid var(--stroke);
    padding-inline-start: 14px;
  }

  .page-about .about-rail__link {
    border: 0;
    border-radius: 0;
    padding: 6px 0;
    background: none;
    color: var(--mist);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: none;
    color: var(--aqua);
    transform: translateX(3px);
  }

  .page-about .about-stage--narrow {
    width: 62%;
    margin-inline-start: auto;
  }

  .page-about .about-version__grid {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(32px, 5vw, 64px);
  }

  .page-about .about-report__panel {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
    padding-inline-start: calc(var(--about-panel-pad) + 18px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-next__link,
  .page-about .about-rail__link,
  .page-about .tab {
    transition: none;
  }

  .page-about .about-next__link:hover,
  .page-about .about-next__link:focus-visible,
  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>