.page-about {
  --about-line: rgba(147, 166, 196, 0.24);
  --about-surface: rgba(22, 48, 92, 0.62);
  --about-glow: rgba(0, 229, 255, 0.14);
  --about-cut: 14px;
  background: var(--abyss);
  color: var(--mist);
  overflow-x: hidden;
}

.page-about h2 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.18;
  font-size: clamp(25px, 4.6vw, 40px);
  margin: 0 0 16px;
  color: var(--mist);
}

.page-about h3 {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.35;
  margin: 0 0 8px;
  color: var(--mist);
}

.page-about p {
  font-size: 16px;
  line-height: 1.78;
  color: var(--haze);
  margin: 0 0 14px;
}

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

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  padding: 76px 0 56px;
  background:
    radial-gradient(110% 80% at 88% -10%, rgba(0, 229, 255, 0.18), transparent 62%),
    radial-gradient(90% 70% at 4% 110%, rgba(255, 45, 149, 0.12), transparent 66%),
    linear-gradient(158deg, var(--abyss) 0%, var(--night) 100%);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: clamp(26px, 5vw, 54px);
  background: linear-gradient(90deg, var(--cyan) 0%, rgba(255, 45, 149, 0.55) 46%, rgba(0, 229, 255, 0) 88%);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  pointer-events: none;
}

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

.page-about .about-hero h1 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.14;
  font-size: clamp(29px, 6.4vw, 56px);
  margin: 14px 0 20px;
  max-width: 20ch;
  color: var(--mist);
}

.page-about .about-hero__lede {
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--haze);
}

.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 30px;
}

.page-about .about-toc__link {
  display: inline-block;
  padding: 8px 14px;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
  text-decoration: none;
  background: rgba(6, 18, 41, 0.55);
  border: 1px solid var(--about-line);
  border-top-color: rgba(0, 229, 255, 0.5);
  clip-path: polygon(8px 0, 100% 0, 100% calc(100% - 8px), calc(100% - 8px) 100%, 0 100%, 0 8px);
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  color: var(--night);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ============ 起步与今天 ============ */
.page-about .about-growth {
  padding-top: clamp(44px, 7vw, 76px);
}

.page-about .about-growth__grid {
  display: grid;
  gap: 32px;
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-facts__item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px 14px 14px;
  background: var(--about-surface);
  border-left: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-facts__item:nth-child(2) {
  border-left-color: var(--magenta);
}

.page-about .about-facts__item:nth-child(3) {
  border-left-color: var(--orange);
}

.page-about .about-facts__item:nth-child(4) {
  border-left-color: var(--green);
}

.page-about .about-facts__key {
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--haze);
}

.page-about .about-facts__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(21px, 3.4vw, 27px);
  letter-spacing: 0.02em;
  color: var(--mist);
  line-height: 1.1;
}

.page-about .about-facts__note {
  font-size: 12px;
  color: var(--haze);
  line-height: 1.5;
}

/* ============ 横向主题带通用 ============ */
.page-about .about-band {
  position: relative;
  margin-top: clamp(48px, 8vw, 88px);
  padding: clamp(44px, 7vw, 82px) 0;
}

.page-about .about-band .lede {
  color: var(--mist);
  opacity: 0.86;
  max-width: 58ch;
}

/* ============ 版本演进 ============ */
.page-about .about-band__figure {
  margin: 0 0 clamp(28px, 4vw, 44px);
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 22px), calc(100% - 22px) 100%, 0 100%);
  border-left: 2px solid rgba(255, 45, 149, 0.7);
}

.page-about .about-band__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 8 / 3;
}

.page-about .about-band__head {
  margin-bottom: 30px;
}

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 7px;
  top: 10px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(180deg, var(--magenta) 0%, var(--cyan) 62%, rgba(147, 166, 196, 0.3) 100%);
}

.page-about .about-timeline__item {
  position: relative;
  padding-bottom: 12px;
}

.page-about .about-timeline__dot {
  position: absolute;
  left: -26px;
  top: 16px;
  width: 16px;
  height: 16px;
  background: var(--cyan);
  clip-path: polygon(50% 0, 100% 50%, 50% 100%, 0 50%);
  box-shadow: 0 0 0 4px rgba(0, 229, 255, 0.12);
}

.page-about .about-timeline__item--now .about-timeline__dot {
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 0, 0.16);
}

.page-about .about-node {
  border: 1px solid var(--about-line);
  border-left: 2px solid rgba(0, 229, 255, 0.55);
  background: rgba(6, 18, 41, 0.5);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .about-timeline__item--now .about-node {
  border-left-color: var(--orange);
  background: rgba(59, 15, 44, 0.4);
}

.page-about .about-node__head {
  display: grid;
  grid-template-columns: auto 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-node__head::after {
  content: "+";
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-node[open] .about-node__head::after {
  content: "–";
  color: var(--orange);
}

.page-about .about-node__year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 14px;
  letter-spacing: 0.08em;
  color: var(--cyan);
  padding: 3px 8px;
  background: rgba(0, 229, 255, 0.1);
  border-radius: 2px;
}

.page-about .about-timeline__item--now .about-node__year {
  color: var(--orange);
  background: rgba(255, 138, 0, 0.14);
}

.page-about .about-node__title {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.45;
  color: var(--mist);
}

.page-about .about-node__body {
  padding: 0 16px 16px;
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--haze);
}

/* ============ 数据来源 ============ */
.page-about .about-sources__grid {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .about-sources__figure {
  margin: 0;
  overflow: hidden;
  border-top: 2px solid rgba(0, 229, 255, 0.55);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-sources__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 4 / 3;
}

.page-about .about-rounds {
  list-style: none;
  margin: 34px 0 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-rounds__item {
  padding: 18px 18px 20px;
  background: rgba(6, 18, 41, 0.55);
  border-top: 3px solid var(--cyan);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
}

.page-about .about-rounds__item:nth-child(2) {
  border-top-color: var(--magenta);
}

.page-about .about-rounds__item:nth-child(3) {
  border-top-color: var(--orange);
}

.page-about .about-rounds__idx {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .about-rounds__item:nth-child(2) .about-rounds__idx {
  color: var(--magenta);
}

.page-about .about-rounds__item:nth-child(3) .about-rounds__idx {
  color: var(--orange);
}

.page-about .about-rounds__title {
  font-size: 17px;
  margin-bottom: 8px;
}

.page-about .about-rounds__item p {
  font-size: 15px;
  margin: 0;
}

/* ============ 团队分工 ============ */
.page-about .about-team {
  padding-top: clamp(48px, 7vw, 84px);
}

.page-about .about-team__grid {
  display: grid;
  gap: 26px;
  align-items: center;
  margin-bottom: 34px;
}

.page-about .about-team__figure {
  margin: 0;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

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

.page-about .about-roster {
  display: grid;
  gap: 12px;
}

.page-about .about-roster__seg {
  position: relative;
  padding: 20px 18px 22px;
  background: var(--about-surface);
  border-left: 4px solid var(--haze);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--about-cut)), calc(100% - var(--about-cut)) 100%, 0 100%);
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-roster__seg:hover,
.page-about .about-roster__seg:focus-within {
  background: rgba(22, 48, 92, 0.92);
  transform: translateX(3px);
}

.page-about .about-roster__seg--eng {
  border-left-color: var(--cyan);
}

.page-about .about-roster__seg--design {
  border-left-color: var(--magenta);
}

.page-about .about-roster__seg--ops {
  border-left-color: var(--orange);
}

.page-about .about-roster__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 4vw, 30px);
  letter-spacing: 0.04em;
  line-height: 1;
  margin: 0 0 10px;
  color: var(--mist);
}

.page-about .about-roster__seg--eng .about-roster__num {
  color: var(--cyan);
}

.page-about .about-roster__seg--design .about-roster__num {
  color: var(--magenta);
}

.page-about .about-roster__seg--ops .about-roster__num {
  color: var(--orange);
}

.page-about .about-roster__name {
  font-size: 16px;
  letter-spacing: 0.02em;
  margin-bottom: 8px;
}

.page-about .about-roster__desc {
  font-size: 14px;
  line-height: 1.72;
  margin: 0;
}

/* ============ 覆盖与节奏 ============ */
.page-about .about-reach {
  padding-top: clamp(44px, 7vw, 78px);
}

.page-about .about-reach__grid {
  display: grid;
  gap: 28px;
  align-items: start;
}

.page-about .about-reach__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin: 0;
  padding: 22px 18px;
  background: linear-gradient(150deg, rgba(36, 16, 70, 0.72), rgba(6, 18, 41, 0.6));
  border: 1px solid var(--about-line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .about-reach__stat {
  padding: 8px 4px;
}

.page-about .about-reach__stat dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--haze);
  margin-bottom: 6px;
}

.page-about .about-reach__stat dd {
  margin: 0;
  font-size: 14px;
  color: var(--mist);
  line-height: 1.4;
}

.page-about .about-reach__stat dd .num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 24px;
  letter-spacing: 0.04em;
  color: var(--cyan);
  margin-right: 6px;
}

.page-about .about-reach__stat:nth-child(2) dd .num {
  color: var(--magenta);
}

.page-about .about-reach__stat:nth-child(3) dd .num {
  color: var(--orange);
}

.page-about .about-reach__stat:nth-child(4) dd .num {
  color: var(--green);
}

/* ============ 用户结构 ============ */
.page-about .about-users {
  padding-top: clamp(44px, 7vw, 78px);
}

.page-about .about-users__lede {
  max-width: 60ch;
  margin-bottom: 24px;
}

.page-about .about-split {
  display: flex;
  height: 74px;
  overflow: hidden;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
}

.page-about .about-split__a,
.page-about .about-split__b {
  display: flex;
  flex-direction: column;
  justify-content: center;
  gap: 2px;
  padding: 0 14px;
  font-size: 12px;
  line-height: 1.3;
}

.page-about .about-split__a {
  width: 41%;
  background: linear-gradient(120deg, rgba(0, 229, 255, 0.9), rgba(0, 229, 255, 0.55));
  color: var(--night);
}

.page-about .about-split__b {
  width: 59%;
  background: rgba(22, 48, 92, 0.8);
  color: var(--haze);
}

.page-about .about-split__val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 20px;
  letter-spacing: 0.04em;
}

.page-about .about-split__cap {
  font-size: 11px;
  letter-spacing: 0.08em;
}

.page-about .about-users__notes {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-users__notes li {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
  padding-bottom: 12px;
  border-bottom: 1px solid rgba(147, 166, 196, 0.14);
}

.page-about .about-users__notes li:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .tag--cyan {
  background: rgba(0, 229, 255, 0.14);
  color: var(--cyan);
  border-color: rgba(0, 229, 255, 0.4);
}

/* ============ 下一步 ============ */
.page-about .about-next {
  padding-top: clamp(40px, 6vw, 70px);
  padding-bottom: clamp(56px, 8vw, 96px);
}

.page-about .about-next__title {
  font-size: clamp(22px, 3.6vw, 30px);
  margin-bottom: 22px;
}

.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-next__link {
  display: block;
  padding: 18px 18px 18px 22px;
  text-decoration: none;
  background: rgba(6, 18, 41, 0.62);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--orange);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
  transition: background 0.22s var(--ease), border-color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  background: rgba(22, 48, 92, 0.9);
  border-left-color: var(--cyan);
  transform: translateX(4px);
}

.page-about .about-next__t {
  display: block;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  color: var(--mist);
  margin-bottom: 6px;
}

.page-about .about-next__d {
  display: block;
  font-size: 14px;
  line-height: 1.7;
  color: var(--haze);
}

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 108px 0 76px;
  }

  .page-about .about-growth__grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-sources__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: 44px;
    align-items: center;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, 0.8fr);
    gap: 44px;
  }

  .page-about .about-roster {
    grid-template-columns: 12fr 8fr 6fr;
    gap: 10px;
    align-items: stretch;
  }

  .page-about .about-roster__seg {
    display: flex;
    flex-direction: column;
    padding: 22px 16px 24px;
  }

  .page-about .about-roster__desc {
    font-size: 13px;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: center;
  }

  .page-about .about-reach__stats {
    padding: 26px 22px;
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .about-timeline__dot {
    left: -34px;
  }

  .page-about .about-timeline::before {
    left: 7px;
  }

  .page-about .about-node__title {
    font-size: 16px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-split {
    height: 86px;
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roster__seg,
  .page-about .about-next__link,
  .page-about .about-toc__link {
    transition: none;
  }
}
<<<END>>>