.page-about {
  --about-rule: rgba(30, 74, 99, 0.78);
  --about-rule-soft: rgba(30, 74, 99, 0.42);
  --about-cyan-soft: rgba(123, 209, 232, 0.16);
  --tl-pad: clamp(18px, 4vw, 34px);
  background: var(--bg);
  color: var(--fg);
  font-family: var(--font-sans);
  overflow-x: hidden;
  overflow-x: clip;
  padding-bottom: clamp(40px, 7vw, 88px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: clamp(12px, 2.4vw, 28px);
}

.page-about .about-hero__frame {
  position: relative;
  border: 1px solid var(--about-rule);
  padding: clamp(24px, 4.6vw, 56px);
  background:
    radial-gradient(120% 150% at 84% -10%, rgba(123, 209, 232, 0.12), transparent 58%),
    linear-gradient(168deg, rgba(18, 51, 73, 0.74), rgba(5, 19, 31, 0.92));
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 11px;
  background-image: repeating-linear-gradient(90deg, rgba(30, 74, 99, 0.95) 0 1px, transparent 1px 22px);
  opacity: 0.65;
  pointer-events: none;
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  inset: 10px;
  border: 1px solid var(--about-rule-soft);
  pointer-events: none;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6em;
  margin: 0 0 clamp(18px, 3vw, 30px);
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--lime-500);
  border-bottom-color: var(--lime-500);
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: space-between;
  align-items: baseline;
  gap: 10px;
  margin-bottom: clamp(20px, 4vw, 36px);
}

.page-about .about-hero__stamp {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 4vw, 52px);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(16px, 3vw, 26px);
  font-weight: 300;
  font-size: clamp(32px, 6.4vw, 78px);
  line-height: 1.06;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .about-hero__lede {
  max-width: 58ch;
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: rgba(234, 242, 246, 0.84);
}

.page-about .about-hero__aside {
  border-top: 1px solid var(--about-rule);
  padding-top: clamp(14px, 2.4vw, 20px);
}

.page-about .about-hero__hint {
  position: relative;
  margin: 0 0 clamp(16px, 3vw, 24px);
  padding-left: 14px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--lime-300);
}

.page-about .about-hero__hint::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 2px;
  background: var(--lime-500);
}

.page-about .about-hero__facts {
  display: grid;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-size: 13px;
  color: var(--mist);
}

.page-about .about-hero__facts .num {
  margin-right: 6px;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  margin-top: clamp(24px, 4vw, 40px);
  padding-top: clamp(14px, 2.4vw, 20px);
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .about-jump a {
  display: inline-flex;
  align-items: baseline;
  gap: 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--white);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
}

.page-about .about-jump a span {
  color: var(--lime-500);
}

.page-about .about-jump a:hover,
.page-about .about-jump a:focus-visible {
  border-bottom-color: var(--lime-500);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-top: clamp(44px, 7vw, 96px);
}

.page-about .about-sec__head {
  position: relative;
  padding-top: clamp(30px, 6vw, 62px);
  margin-bottom: clamp(20px, 3.4vw, 34px);
}

.page-about .about-sec__num {
  position: absolute;
  top: 0;
  left: -0.05em;
  font-family: var(--font-mono);
  font-size: clamp(64px, 14vw, 120px);
  font-weight: 300;
  line-height: 0.78;
  letter-spacing: -0.05em;
  color: rgba(123, 209, 232, 0.15);
  pointer-events: none;
  user-select: none;
}

.page-about .about-sec__kicker {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-h2 {
  max-width: 26ch;
  margin: 0;
  font-size: clamp(24px, 4.2vw, 42px);
  font-weight: 800;
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: var(--white);
}

/* ---------- 01 起点 ---------- */
.page-about .about-why {
  display: grid;
  gap: clamp(22px, 4vw, 44px);
}

.page-about .about-why__text p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(234, 242, 246, 0.86);
}

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

.page-about .about-why__aside {
  border-left: 2px solid var(--cyan);
  padding: 4px 0 4px clamp(14px, 2.4vw, 22px);
}

.page-about .about-why__quote {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.2vw, 21px);
  font-weight: 800;
  line-height: 1.6;
  color: var(--white);
}

.page-about .about-why__note {
  margin: 0;
  font-size: 12px;
  line-height: 1.7;
  color: var(--mist);
}

/* ---------- 02 三条主张 ---------- */
.page-about .about-principles {
  display: grid;
  gap: clamp(20px, 3.4vw, 36px);
  align-items: start;
  margin-bottom: clamp(26px, 4vw, 44px);
}

.page-about .about-principles__intro p {
  margin: 0;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(234, 242, 246, 0.82);
}

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

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-rule);
  object-fit: cover;
  background: var(--ink-700);
}

.page-about .about-figure--tall img {
  aspect-ratio: 9 / 11;
  clip-path: polygon(0 0, 100% 0, 100% 94%, 0 100%);
}

.page-about .about-figure--wide img {
  aspect-ratio: 7 / 4;
  clip-path: polygon(0 0, 100% 2%, 100% 100%, 0 98%);
}

.page-about .about-figure figcaption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  line-height: 1.7;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-tenets {
  display: grid;
  gap: clamp(14px, 2.2vw, 22px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tenet {
  position: relative;
  padding: clamp(18px, 3vw, 28px);
  background: var(--glass-bg);
  border: 1px solid var(--about-rule);
  -webkit-backdrop-filter: blur(6px);
  backdrop-filter: blur(6px);
  transition: border-color 180ms ease-out, background-color 180ms ease-out;
}

.page-about .about-tenet:hover,
.page-about .about-tenet:focus-within {
  border-color: var(--lime-500);
  background: rgba(18, 51, 73, 0.74);
}

.page-about .about-tenet__no {
  display: block;
  margin-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--lime-500);
}

.page-about .about-tenet__title {
  margin: 0 0 10px;
  font-size: clamp(19px, 2.4vw, 23px);
  font-weight: 800;
  color: var(--white);
}

.page-about .about-tenet p {
  margin: 0 0 18px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(234, 242, 246, 0.8);
}

.page-about .about-tenet__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(123, 209, 232, 0.35);
  padding-bottom: 3px;
}

.page-about .about-tenet:not(:hover) .about-tenet__link {
  opacity: 0.72;
}

.page-about .about-tenet__link:hover,
.page-about .about-tenet__link:focus-visible {
  color: var(--lime-300);
  border-bottom-color: var(--lime-500);
  opacity: 1;
}

/* ---------- 03 团队 ---------- */
.page-about .about-figure--wide {
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .about-team {
  display: grid;
  gap: clamp(22px, 4vw, 46px);
}

.page-about .about-team__text p {
  margin: 0 0 1.1em;
  font-size: 15px;
  line-height: 1.9;
  color: rgba(234, 242, 246, 0.84);
}

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

.page-about .about-roster {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-roster li {
  display: grid;
  grid-template-columns: 1fr auto auto;
  align-items: baseline;
  gap: 8px;
  padding: 12px 0;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-roster__role {
  font-size: 14px;
  color: rgba(234, 242, 246, 0.82);
}

.page-about .about-roster__num {
  font-family: var(--font-mono);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 500;
  color: var(--amber-500);
  font-variant-numeric: tabular-nums;
}

.page-about .about-roster__unit {
  font-size: 11px;
  color: var(--mist);
}

/* ---------- 04 数据条 ---------- */
.page-about .about-stats {
  position: relative;
  margin-top: clamp(22px, 3.6vw, 40px);
  padding: clamp(28px, 5vw, 56px) 0;
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
  overflow: hidden;
}

.page-about .about-stats__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.18;
  filter: saturate(0.6) brightness(0.7);
  pointer-events: none;
}

.page-about .about-stats .shell {
  position: relative;
}

.page-about .about-stats__list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 2.6vw, 28px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat__value {
  display: flex;
  align-items: baseline;
  gap: 3px;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 40px);
  font-weight: 500;
  line-height: 1;
  color: var(--white);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__plus {
  font-size: 0.5em;
  color: var(--cyan);
}

.page-about .about-stat__label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--mist);
}

.page-about .about-stat__bar {
  display: block;
  width: 100%;
  height: 3px;
  margin-top: 8px;
  transform: scaleX(0.28);
  transform-origin: left center;
  background: linear-gradient(90deg, var(--cyan), rgba(123, 209, 232, 0.05));
  transition: transform 600ms ease-out;
}

.page-about .about-stat.is-revealed .about-stat__bar {
  transform: scaleX(1);
}

.page-about .about-stats__list > :nth-child(1) .about-stat__bar { width: 92%; }
.page-about .about-stats__list > :nth-child(2) .about-stat__bar { width: 64%; }
.page-about .about-stats__list > :nth-child(3) .about-stat__bar { width: 78%; }
.page-about .about-stats__list > :nth-child(4) .about-stat__bar { width: 86%; }
.page-about .about-stats__list > :nth-child(5) .about-stat__bar { width: 71%; }
.page-about .about-stats__list > :nth-child(6) .about-stat__bar { width: 55%; }

.page-about .about-stats__note {
  max-width: 62ch;
  margin: clamp(20px, 3.4vw, 32px) 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(234, 242, 246, 0.78);
}

/* ---------- 05 时间轴 ---------- */
.page-about .about-stages__intro {
  max-width: 56ch;
  margin: 0 0 clamp(20px, 3.4vw, 32px);
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}

.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 var(--tl-pad);
  list-style: none;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), rgba(123, 209, 232, 0.12));
  opacity: 0.55;
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  top: 26px;
  left: calc(-1 * var(--tl-pad) - 4px);
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 1px solid var(--cyan);
}

.page-about .about-stage__box {
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-stage__box summary {
  display: grid;
  grid-template-columns: 1fr auto;
  gap: 6px 16px;
  padding: clamp(16px, 2.6vw, 24px) 30px clamp(16px, 2.6vw, 24px) 0;
  cursor: pointer;
  list-style: none;
  position: relative;
}

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

.page-about .about-stage__box summary::after {
  content: "+";
  position: absolute;
  right: 0;
  top: clamp(14px, 2.4vw, 22px);
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime-500);
}

.page-about .about-stage__box[open] summary::after {
  content: "−";
}

.page-about .about-stage__box summary:hover .about-stage__title,
.page-about .about-stage__box summary:focus-visible .about-stage__title {
  color: var(--lime-300);
}

.page-about .about-stage__idx {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--lime-500);
}

.page-about .about-stage__ver {
  font-family: var(--font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: var(--mist);
  text-align: right;
}

.page-about .about-stage__title {
  grid-column: 1 / -1;
  font-size: clamp(17px, 2.4vw, 21px);
  font-weight: 800;
  line-height: 1.5;
  color: var(--white);
  transition: color 160ms ease-out;
}

.page-about .about-stage__body {
  padding: 0 0 clamp(18px, 3vw, 28px);
}

.page-about .about-stage__body p {
  max-width: 62ch;
  margin: 0 0 14px;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(234, 242, 246, 0.82);
}

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

.page-about .about-stage__body li {
  position: relative;
  padding-left: 16px;
  margin-bottom: 6px;
  font-size: 13px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-stage__body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 7px;
  height: 1px;
  background: var(--cyan);
}

/* ---------- 06 一起做 ---------- */
.page-about .about-together {
  display: grid;
  gap: clamp(14px, 2.4vw, 22px);
}

.page-about .about-together__item {
  padding: clamp(18px, 3vw, 26px);
  background: var(--ink-700);
  border-top: 3px solid var(--amber-500);
}

.page-about .about-together__item h3 {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 800;
  color: var(--white);
}

.page-about .about-together__item p {
  margin: 0 0 16px;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(234, 242, 246, 0.8);
}

.page-about .about-together__link {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--amber-200);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 215, 154, 0.4);
  padding-bottom: 3px;
}

.page-about .about-together__link:hover,
.page-about .about-together__link:focus-visible {
  color: var(--lime-300);
  border-bottom-color: var(--lime-500);
}

.page-about .about-together__foot {
  max-width: 66ch;
  margin: clamp(20px, 3.4vw, 32px) 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--mist);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  padding-top: clamp(40px, 6vw, 84px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(18px, 3vw, 32px);
  padding: clamp(24px, 4.4vw, 48px);
  border: 1px solid var(--about-rule);
  background:
    linear-gradient(120deg, rgba(182, 242, 74, 0.12), transparent 60%),
    var(--ink-800);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(22px, 3.6vw, 34px);
  font-weight: 800;
  line-height: 1.3;
  color: var(--white);
}

.page-about .about-cta__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(234, 242, 246, 0.8);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
}

/* ---------- 响应式 ---------- */
@media (min-width: 680px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .about-stats__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 34px);
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
  }

  .page-about .about-hero__aside {
    border-top: none;
    border-left: 1px solid var(--about-rule);
    padding-top: 0;
    padding-left: clamp(20px, 3vw, 32px);
  }

  .page-about .about-why {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .about-principles__intro {
    padding-top: clamp(10px, 2vw, 24px);
  }

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

  .page-about .about-tenet:nth-child(2) {
    transform: translateY(28px);
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1100px) {
  .page-about .about-stats__list {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tenet,
  .page-about .about-stage__title,
  .page-about .about-stat__bar {
    transition: none;
  }

  .page-about .about-stat__bar {
    transform: scaleX(1);
  }

  .page-about .about-tenet:nth-child(2) {
    transform: none;
  }
}
<<<END>>>