.page-about {
  --about-body: 620px;
  --about-body-narrow: 440px;
  background:
    radial-gradient(1100px 560px at 82% -6%, rgba(123, 92, 255, 0.18), transparent 62%),
    radial-gradient(760px 480px at 4% 16%, rgba(123, 242, 228, 0.09), transparent 64%),
    var(--ink);
  color: var(--moon);
  overflow-x: clip;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 44px) 0;
}

.page-about .about-hero__arc {
  position: absolute;
  top: -40px;
  right: -14vw;
  width: min(560px, 78vw);
  height: auto;
  pointer-events: none;
  display: none;
}

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 6.4vw, 66px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  margin: 14px 0 18px;
  max-width: 13em;
}

.page-about .about-hero__lead {
  font-size: clamp(15.5px, 1.5vw, 18px);
  line-height: 1.78;
  color: rgba(233, 238, 249, 0.82);
  max-width: 33em;
  margin: 0;
}

.page-about .about-hero__facts {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 20px clamp(24px, 5vw, 56px);
  margin: 30px 0 0;
  padding: 22px 0 0;
  border-top: var(--line);
}

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

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-fact__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--haze);
}

.page-about .about-jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 26px;
}

.page-about .about-jump a {
  display: inline-block;
  padding: 6px 13px;
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--haze);
  text-decoration: none;
  border: 1.5px solid var(--nebula);
  border-radius: 999px;
  transition: color 180ms ease-out, border-color 180ms ease-out, transform 180ms ease-out;
}

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

.page-about .about-hero__figure {
  margin: clamp(28px, 5vw, 48px) 0 0;
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: clamp(200px, 36vw, 430px);
  object-fit: cover;
  filter: saturate(0.92) contrast(1.05) brightness(0.86);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 34px), 0 100%);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  padding-block: clamp(38px, 6vw, 76px);
  border-top: var(--line);
}

.page-about .about-chapter__side {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-chapter__index {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: 0.06em;
}

.page-about .about-chapter__label {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--haze);
  text-transform: uppercase;
}

.page-about .about-chapter__body {
  max-width: var(--about-body);
}

.page-about .about-chapter--wide .about-chapter__body {
  max-width: 100%;
}

.page-about .about-chapter h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.01em;
  margin: 0 0 14px;
}

.page-about .about-chapter p {
  font-size: 16.5px;
  line-height: 1.78;
  color: rgba(233, 238, 249, 0.8);
  margin: 0 0 14px;
  max-width: 32em;
}

/* ---------- 三条主张 ---------- */
.page-about .about-claims {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-claim {
  position: relative;
  padding: 24px 22px 26px;
  background: var(--night);
  color: var(--moon);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: background 200ms ease-out, color 200ms ease-out, transform 180ms ease-out;
}

.page-about .about-claim--paper {
  background: var(--paper);
  color: var(--paper-ink);
}

.page-about .about-claim__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--cyan);
  margin-bottom: 12px;
}

.page-about .about-claim--paper .about-claim__num {
  color: var(--ember);
}

.page-about .about-claim h3 {
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
  color: inherit;
}

.page-about .about-claim p {
  font-size: 15px;
  line-height: 1.72;
  color: inherit;
  opacity: 0.8;
  margin: 0;
  max-width: none;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-wrap {
  position: relative;
  margin-top: 26px;
  padding: clamp(22px, 4vw, 40px);
  background: var(--night);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  overflow: hidden;
}

.page-about .about-timeline-wrap__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.2;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-timeline {
  position: relative;
  z-index: 1;
}

.page-about .about-timeline__arc {
  display: none;
}

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

.page-about .about-timeline__item {
  position: relative;
  padding: 16px 0 20px;
  border-bottom: 1.5px solid rgba(22, 36, 76, 0.95);
}

.page-about .about-timeline__item:last-child {
  border-bottom: none;
  padding-bottom: 0;
}

.page-about .about-timeline__year {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--yellow);
  font-variant-numeric: tabular-nums;
}

.page-about .about-timeline__item--now .about-timeline__year {
  color: var(--orange);
}

.page-about .about-timeline__item h3 {
  font-family: var(--font-display);
  font-size: 18.5px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 6px 0 8px;
}

.page-about .about-timeline__item p {
  font-size: 15px;
  line-height: 1.72;
  color: rgba(169, 182, 214, 0.94);
  margin: 0;
  max-width: 34em;
}

.page-about .about-timeline__result {
  margin-top: 8px !important;
  font-size: 14px !important;
  color: var(--cyan) !important;
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: 3rem minmax(0, 1fr);
  gap: 4px 14px;
  padding: 16px 0;
  border-bottom: 1.5px solid var(--nebula);
}

.page-about .about-team__num {
  grid-row: span 2;
  align-self: start;
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  color: var(--cyan);
  font-variant-numeric: tabular-nums;
}

.page-about .about-team__role {
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--moon);
}

.page-about .about-team__desc {
  grid-column: 2;
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(169, 182, 214, 0.94);
  max-width: 36em;
}

.page-about .about-team__note {
  margin-top: 18px !important;
  padding-left: 14px;
  border-left: 3px solid var(--violet);
  font-size: 15px !important;
  color: var(--haze) !important;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cadence-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin-top: 26px;
  align-items: start;
}

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

.page-about .about-cadence li {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 14px 0;
  border-bottom: 1.5px solid var(--nebula);
}

.page-about .about-cadence__time {
  font-family: var(--font-mono);
  font-size: 14.5px;
  font-weight: 700;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .about-cadence li p {
  margin: 0;
  font-size: 15px;
  line-height: 1.72;
  color: rgba(233, 238, 249, 0.82);
  max-width: 30em;
}

.page-about .about-cadence-layout__figure {
  margin: 0;
}

.page-about .about-cadence-layout__figure img {
  display: block;
  width: 100%;
  height: clamp(180px, 26vw, 300px);
  object-fit: cover;
  filter: saturate(0.85) brightness(0.82);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 22px 100%, 0 calc(100% - 22px));
}

.page-about .about-cadence-layout__figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--haze);
}

/* ---------- 适合谁 ---------- */
.page-about .about-audience {
  list-style: none;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
}

.page-about .about-audience__item {
  padding: 22px 20px 24px;
  border: 1.5px solid var(--nebula);
  background: linear-gradient(180deg, rgba(12, 22, 48, 0.92), rgba(5, 10, 24, 0.92));
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, var(--cut) 100%, 0 calc(100% - var(--cut)));
  transition: border-color 180ms ease-out, transform 180ms ease-out;
}

.page-about .about-audience__item:hover,
.page-about .about-audience__item:focus-within {
  border-color: var(--cyan);
  transform: translateY(-3px);
}

.page-about .about-audience__item h3 {
  font-family: var(--font-display);
  font-size: 17.5px;
  font-weight: 800;
  letter-spacing: -0.01em;
  margin: 12px 0 8px;
}

.page-about .about-audience__item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: rgba(169, 182, 214, 0.94);
  max-width: none;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(20px, 4vw, 40px);
  border-top: var(--line);
  background:
    linear-gradient(115deg, rgba(123, 92, 255, 0.16), transparent 55%),
    linear-gradient(0deg, rgba(255, 122, 47, 0.08), transparent 60%);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  padding-block: clamp(40px, 6vw, 76px);
}

.page-about .about-cta h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 38px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  margin: 12px 0 12px;
}

.page-about .about-cta p {
  margin: 0;
  font-size: 16px;
  line-height: 1.76;
  color: rgba(233, 238, 249, 0.8);
  max-width: 34em;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  align-self: start;
}

/* ---------- 悬停与动效 ---------- */
@media (hover: hover) {
  .page-about .about-claim:hover,
  .page-about .about-claim:focus-visible {
    background: var(--paper);
    color: var(--paper-ink);
    transform: translateY(-2px);
  }

  .page-about .about-claim--paper:hover,
  .page-about .about-claim--paper:focus-visible {
    background: var(--night);
    color: var(--moon);
  }

  .page-about .about-claim--paper:hover .about-claim__num,
  .page-about .about-claim--paper:focus-visible .about-claim__num {
    color: var(--cyan);
  }

  .page-about .about-timeline__result {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height 220ms ease-out, opacity 180ms ease-out;
  }

  .page-about .about-timeline__item:hover .about-timeline__result,
  .page-about .about-timeline__item:focus-within .about-timeline__result,
  .page-about .about-timeline__item:focus .about-timeline__result {
    max-height: 8em;
    opacity: 1;
  }
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-claims {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

  .page-about .about-team__row {
    grid-template-columns: 3.5rem 130px minmax(0, 1fr);
    align-items: baseline;
    gap: 6px 18px;
  }

  .page-about .about-team__num {
    grid-row: auto;
  }

  .page-about .about-team__desc {
    grid-column: 3;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 940px) {
  .page-about .about-hero__arc {
    display: block;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .about-chapter--wide .about-chapter__inner {
    grid-template-columns: 118px minmax(0, 1fr);
  }

  .page-about .about-chapter__side {
    position: sticky;
    top: 96px;
    align-self: start;
    flex-direction: column;
    gap: 6px;
  }

  .page-about .about-chapter__index {
    font-size: 15px;
  }

  .page-about .about-chapter__label {
    font-size: 11px;
    letter-spacing: 0.16em;
  }

  .page-about .about-chapter--narrow .about-chapter__body {
    max-width: var(--about-body-narrow);
  }

  .page-about .about-cadence-layout {
    grid-template-columns: 1.12fr 0.88fr;
    gap: 40px;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 40px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }

  /* 时间线竖轴 */
  .page-about .about-timeline {
    padding-left: 64px;
  }

  .page-about .about-timeline__arc {
    display: block;
    position: absolute;
    inset: 0 auto 0 0;
    width: 64px;
    height: 100%;
    pointer-events: none;
  }

  .page-about .about-timeline__item::before {
    content: "";
    position: absolute;
    left: -36px;
    top: 20px;
    width: 9px;
    height: 9px;
    border-radius: 50%;
    border: 1.5px solid var(--cyan);
    background: var(--ink);
  }

  .page-about .about-timeline__item--now::before {
    background: var(--orange);
    border-color: var(--orange);
    box-shadow: 0 0 0 4px rgba(255, 122, 47, 0.18);
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__lead {
    max-width: 36em;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-claim,
  .page-about .about-jump a,
  .page-about .about-audience__item,
  .page-about .about-timeline__result {
    transition: none !important;
  }
}
<<<END>>>