.page-about {
  --about-deep: #101B2E;
  --about-deep-soft: rgba(16, 27, 46, 0.76);
  --about-deep-faint: rgba(16, 27, 46, 0.52);
  --about-hairline: rgba(16, 27, 46, 0.16);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(32px, 7vw, 74px) 0 clamp(38px, 6vw, 78px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -10%;
  right: -16%;
  width: min(640px, 82vw);
  height: min(450px, 64vw);
  background: linear-gradient(135deg, rgba(34, 224, 214, 0.2), rgba(34, 224, 214, 0) 66%);
  clip-path: polygon(16% 0, 100% 0, 100% 78%, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -12%;
  bottom: -18%;
  width: min(420px, 62vw);
  height: min(320px, 48vw);
  background: linear-gradient(0deg, rgba(255, 107, 44, 0.12), rgba(255, 107, 44, 0) 70%);
  clip-path: polygon(0 0, 62% 0, 0 100%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 48px);
  margin-top: clamp(20px, 4vw, 38px);
}

.page-about .about-hero h1 {
  margin: 12px 0 0;
  font-family: var(--font-narrow);
  font-weight: 700;
  font-size: clamp(30px, 6.2vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  color: var(--paper);
}

.page-about .about-hero__intro {
  margin: 18px 0 0;
  max-width: 36em;
  font-size: clamp(15px, 1.1vw + 12px, 18px);
  line-height: 1.85;
  color: var(--paper-soft);
}

.page-about .fact-list {
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .fact-list__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 11px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .fact-list dt {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .fact-list dd {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--paper);
  text-align: right;
}

/* ---------- 起点 ---------- */
.page-about .about-origin {
  padding: clamp(42px, 7vw, 88px) 0 clamp(30px, 5vw, 60px);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 4vw, 52px);
}

.page-about .about-origin__head {
  position: relative;
  padding-left: 18px;
}

.page-about .about-origin__head::before {
  content: "";
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 3px;
  background: linear-gradient(180deg, var(--cyan), rgba(34, 224, 214, 0));
}

.page-about .about-origin__lede {
  margin: 0 0 18px;
  font-family: var(--font-serif);
  font-size: clamp(18px, 1.5vw + 12px, 25px);
  line-height: 1.7;
  color: var(--paper);
}

.page-about .about-origin__body p {
  margin: 0 0 16px;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--paper-soft);
}

.page-about .origin-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
}

/* ---------- 迭代时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  overflow: hidden;
  padding: clamp(48px, 8vw, 98px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .about-timeline__backdrop {
  position: absolute;
  inset: 0;
  z-index: 0;
  pointer-events: none;
}

.page-about .about-timeline__backdrop img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.24;
  filter: saturate(0.4) contrast(1.05);
}

.page-about .about-timeline__backdrop::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, var(--ink-900) 0%, rgba(11, 18, 32, 0.86) 34%, rgba(11, 18, 32, 0.94) 100%);
}

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

.page-about .about-timeline__lead {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--paper-soft);
}

.page-about .track {
  position: relative;
  margin: clamp(28px, 5vw, 54px) 0 0;
  padding: 0 0 0 34px;
  list-style: none;
}

.page-about .track::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(34, 224, 214, 0.9) 0%, rgba(34, 224, 214, 0.35) 52%, rgba(42, 58, 85, 0.7) 100%);
}

.page-about .track__item {
  position: relative;
  padding: 0 0 clamp(26px, 4vw, 46px);
}

.page-about .track__item:last-child {
  padding-bottom: 0;
}

.page-about .track__dot {
  position: absolute;
  left: -34px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--ink-900);
  border: 2px solid var(--line);
  box-shadow: 0 0 0 4px rgba(11, 18, 32, 0.92);
  transition: background 0.28s var(--ease), border-color 0.28s var(--ease), box-shadow 0.28s var(--ease);
}

.page-about .track__item:hover .track__dot,
.page-about .track__item:focus-within .track__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(11, 18, 32, 0.92), 0 0 16px rgba(34, 224, 214, 0.65);
}

.page-about .track__meta {
  display: flex;
  align-items: center;
  flex-wrap: wrap;
  gap: 10px;
  margin: 0 0 8px;
}

.page-about .track__year {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .track__title {
  margin: 0 0 8px;
  font-family: var(--font-narrow);
  font-size: clamp(19px, 1.3vw + 14px, 26px);
  font-weight: 700;
  line-height: 1.3;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .track__text {
  margin: 0;
  max-width: 44em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-soft);
}

/* ---------- 暖纸白反相区块 ---------- */
.page-about .about-paper {
  position: relative;
  background: var(--paper);
  color: var(--about-deep);
  padding: clamp(74px, 11vw, 132px) 0;
  clip-path: polygon(0 4vw, 100% 0, 100% calc(100% - 4vw), 0 100%);
}

.page-about .about-paper .kicker {
  color: var(--about-deep);
  opacity: 0.68;
}

.page-about .about-paper .section-title {
  color: var(--about-deep);
}

.page-about .about-paper__lead {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--about-deep-soft);
}

.page-about .about-paper__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(26px, 4vw, 44px);
}

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

.page-about .about-paper__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  filter: saturate(0.86) contrast(1.04);
  clip-path: polygon(0 0, 100% 0, 100% 93%, 0 100%);
}

.page-about .about-paper__figure figcaption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--about-deep-faint);
}

.page-about .about-paper__body p {
  margin: 0 0 16px;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.9;
  color: var(--about-deep-soft);
}

.page-about .split-bars {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin: clamp(30px, 4vw, 50px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .split-bar__top {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  padding-bottom: 9px;
  border-bottom: 1px solid var(--about-hairline);
}

.page-about .split-bar__name {
  font-family: var(--font-narrow);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--about-deep);
}

.page-about .split-bar__num {
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--about-deep);
}

.page-about .split-bar__track {
  margin-top: 12px;
  height: 6px;
  border-radius: 999px;
  background: rgba(16, 27, 46, 0.12);
  overflow: hidden;
}

.page-about .split-bar__fill {
  display: block;
  height: 100%;
  border-radius: inherit;
  transform-origin: left center;
  background: linear-gradient(90deg, var(--ink-800), var(--grass));
  transition: filter 0.26s var(--ease), transform 0.26s var(--ease);
}

.page-about .split-bar:hover .split-bar__fill,
.page-about .split-bar:focus-within .split-bar__fill {
  filter: brightness(1.16) saturate(1.12);
  transform: scaleY(1.6);
}

.page-about .split-bar--data .split-bar__fill {
  width: 44%;
}

.page-about .split-bar--editor .split-bar__fill {
  width: 34%;
}

.page-about .split-bar--product .split-bar__fill {
  width: 22%;
}

.page-about .split-bar__desc {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--about-deep-soft);
}

/* ---------- 内容整理 ---------- */
.page-about .about-process {
  padding: clamp(48px, 8vw, 96px) 0;
}

.page-about .about-process__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 4vw, 52px);
}

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

.page-about .about-process__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1 / 1;
  object-fit: cover;
  opacity: 0.9;
  clip-path: polygon(0 0, 100% 0, 100% 88%, 0 100%);
}

.page-about .about-process__lead {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--paper-soft);
}

.page-about .steps {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line-soft);
}

.page-about .steps__item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 6px 16px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .steps__idx {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.08em;
  color: var(--orange);
  padding-top: 2px;
}

.page-about .steps__title {
  margin: 0 0 6px;
  font-family: var(--font-narrow);
  font-size: 19px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .steps__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--paper-soft);
}

/* ---------- 用户与访问节奏 ---------- */
.page-about .about-reach {
  padding: clamp(42px, 7vw, 86px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(24px, 4vw, 42px);
}

.page-about .reach-item {
  padding-top: 18px;
  border-top: 3px solid var(--cyan);
}

.page-about .reach-item:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .reach-item:nth-child(3) {
  border-top-color: var(--grass);
}

.page-about .reach-item__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 600;
  line-height: 1.1;
  letter-spacing: 0.04em;
  color: var(--paper);
}

.page-about .reach-item__label {
  display: block;
  margin-top: 10px;
  font-size: 13.5px;
  letter-spacing: 0.03em;
  color: var(--mist);
}

.page-about .reach-note {
  margin: clamp(24px, 3vw, 34px) 0 0;
  max-width: 46em;
  font-size: 15px;
  line-height: 1.88;
  color: var(--paper-soft);
}

/* ---------- 协作生态 ---------- */
.page-about .about-partners {
  padding: clamp(42px, 7vw, 86px) 0;
  border-top: 1px solid var(--line-soft);
}

.page-about .partner-flow {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin-top: clamp(22px, 3vw, 36px);
  border-top: 1px solid var(--line-soft);
}

.page-about .partner-cell {
  padding: 22px 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .partner-cell__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 22px;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .partner-cell__title {
  margin: 10px 0 8px;
  font-family: var(--font-narrow);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.01em;
  color: var(--paper);
}

.page-about .partner-cell__text {
  margin: 0;
  max-width: 34em;
  font-size: 14.5px;
  line-height: 1.82;
  color: var(--paper-soft);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  padding: clamp(44px, 7vw, 88px) 0 clamp(56px, 9vw, 108px);
  border-top: 1px solid var(--line-soft);
  background: linear-gradient(180deg, rgba(20, 31, 53, 0) 0%, rgba(20, 31, 53, 0.72) 100%);
}

.page-about .next-links {
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .next-links li {
  border-top: 1px solid var(--line-soft);
}

.page-about .next-links li:last-child {
  border-bottom: 1px solid var(--line-soft);
}

.page-about .next-link {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 18px;
  padding: 18px 4px;
  text-decoration: none;
  color: var(--paper);
  transition: color 0.22s var(--ease), padding-left 0.22s var(--ease);
}

.page-about .next-link__label {
  display: flex;
  flex-direction: column;
  gap: 5px;
  font-family: var(--font-narrow);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.02em;
}

.page-about .next-link__hint {
  font-family: var(--font-body);
  font-size: 13px;
  font-weight: 400;
  letter-spacing: 0;
  color: var(--mist);
}

.page-about .next-link__arrow {
  flex: none;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--line);
  transition: color 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .next-link:hover,
.page-about .next-link:focus-visible {
  color: var(--cyan);
  padding-left: 12px;
}

.page-about .next-link:hover .next-link__arrow,
.page-about .next-link:focus-visible .next-link__arrow {
  color: var(--cyan);
  transform: translateX(4px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .reach-grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .split-bars {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(18px, 3vw, 34px);
  }
}

@media (min-width: 860px) {
  .page-about .partner-flow {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .partner-cell {
    padding: 28px clamp(18px, 2.4vw, 34px);
    border-bottom: none;
    border-left: 1px solid var(--line-soft);
  }

  .page-about .partner-cell:first-child {
    border-left: none;
    padding-left: 0;
  }

  .page-about .partner-cell:last-child {
    padding-right: 0;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.62fr) minmax(250px, 0.88fr);
    align-items: end;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 1.3fr);
    align-items: start;
  }

  .page-about .about-paper__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

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

  .page-about .track {
    padding-left: 52px;
  }

  .page-about .track::before {
    left: 5px;
  }

  .page-about .track__dot {
    left: -52px;
  }
}
<<<END>>>