.page-about {
  --about-ink-text: rgba(244, 248, 246, 0.8);
  --about-ink-strong: #F4F8F6;
  --about-line-soft: rgba(157, 179, 171, 0.2);
  --about-line-stronger: rgba(23, 224, 200, 0.4);
}

/* ---------- Hero ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--about-ink-text);
  padding: clamp(1.25rem, 3vw, 2rem) 0 clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--grid-line) 1px, transparent 1px),
    linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 72px 72px;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: -10%;
  top: 32%;
  width: min(52vw, 520px);
  height: 2px;
  background: linear-gradient(90deg, transparent, var(--cyan-dark));
  transform: skewX(var(--skew));
  opacity: 0.6;
  pointer-events: none;
}

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

.page-about .about-hero .breadcrumbs {
  margin-bottom: clamp(1.75rem, 4vw, 2.75rem);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-kicker::before {
  content: "";
  display: inline-block;
  width: 22px;
  height: 3px;
  margin-right: 0.6rem;
  vertical-align: middle;
  background: var(--amber);
  transform: skewX(var(--skew));
}

.page-about .about-hero h1 {
  margin: 0.7rem 0 1.1rem;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(2.2rem, 5.5vw, 4rem);
  line-height: 1.04;
  letter-spacing: -0.01em;
  color: var(--about-ink-strong);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 62ch;
  font-size: clamp(1rem, 1.4vw, 1.1rem);
  line-height: 1.85;
  color: var(--about-ink-text);
}

/* ---------- 速览面板 ---------- */
.page-about .about-summary {
  background: rgba(7, 30, 26, 0.72);
  border-left: 3px solid var(--cyan);
  padding: 1.4rem 1.5rem 1.2rem;
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .about-summary__title {
  margin: 0 0 0.9rem;
  font-family: var(--mono);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neutral);
}

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

.page-about .about-summary__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.55rem 0;
  border-bottom: 1px solid var(--about-line-soft);
  font-size: 0.875rem;
}

.page-about .about-summary__row:last-child {
  border-bottom: 0;
  padding-bottom: 0.15rem;
}

.page-about .about-summary__row dt {
  color: var(--neutral);
  flex: 0 0 auto;
}

.page-about .about-summary__row dd {
  margin: 0;
  font-family: var(--mono);
  font-size: 0.9rem;
  color: var(--cyan);
  text-align: right;
}

/* ---------- 章节色阶 ---------- */
.page-about .about-band {
  color: var(--about-ink-text);
}

.page-about .about-band--dark {
  background: var(--ink);
}

.page-about .about-band--mid {
  background: var(--ink-mid);
}

.page-about .about-band--deep {
  background: var(--ink-deep);
}

.page-about .about-band--light {
  background: var(--wash);
  color: var(--text-ink);
}

.page-about .about-band h2 {
  color: var(--about-ink-strong);
}

.page-about .about-band--light h2 {
  color: var(--text-ink);
}

.page-about .about-band a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid var(--about-line-stronger);
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .about-band a:hover,
.page-about .about-band a:focus-visible {
  color: var(--amber);
  border-bottom-color: var(--amber);
}

.page-about .about-band--light a {
  color: var(--ink-mid);
  border-bottom-color: rgba(20, 82, 74, 0.4);
}

.page-about .about-band--light a:hover,
.page-about .about-band--light a:focus-visible {
  color: var(--ink);
  border-bottom-color: var(--ink);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  display: grid;
  gap: 1.5rem;
  padding-top: clamp(3rem, 7vw, 5.5rem);
  padding-bottom: clamp(3rem, 7vw, 5.5rem);
}

.page-about .about-chapter__rail {
  display: flex;
  align-items: center;
  gap: 0.85rem;
}

.page-about .about-node__no {
  font-family: var(--mono);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-band--light .about-node__no {
  color: var(--ink-mid);
}

.page-about .about-node__slash {
  display: block;
  width: 30px;
  height: 3px;
  background: var(--amber);
  transform: skewX(var(--skew));
  transform-origin: left center;
  flex: 0 0 auto;
}

.page-about .about-node__label {
  font-family: var(--mono);
  font-size: 0.76rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--neutral);
}

.page-about .about-chapter__body {
  min-width: 0;
  max-width: 66ch;
}

.page-about .about-chapter__body h2 {
  margin: 0 0 1.15rem;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(1.6rem, 3.8vw, 2.4rem);
  line-height: 1.16;
  letter-spacing: -0.005em;
}

.page-about .about-chapter__body p {
  margin: 0 0 1.1rem;
  font-size: 1rem;
  line-height: 1.82;
}

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

/* ---------- 对比条 ---------- */
.page-about .about-compare {
  display: grid;
  gap: 1px;
  margin-top: 1.75rem;
  background: var(--about-line-soft);
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-compare__cell {
  padding: 1.1rem 0 0.2rem;
  background: transparent;
}

.page-about .about-compare__k {
  margin: 0 0 0.35rem;
  font-family: var(--mono);
  font-size: 0.72rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--neutral);
}

.page-about .about-compare__v {
  margin: 0;
  font-family: var(--display);
  font-weight: 700;
  font-size: clamp(1.05rem, 2.2vw, 1.35rem);
  line-height: 1.3;
  color: var(--cyan);
}

/* ---------- 图文分栏 ---------- */
.page-about .about-chapter__figure {
  margin: 0;
}

.page-about .about-chapter__figure--wide {
  margin-bottom: 1.75rem;
}

/* ---------- 节奏列表 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 1.6rem 0 1.6rem;
  padding: 0;
}

.page-about .about-rhythm__item {
  display: grid;
  gap: 0.35rem;
  padding: 1rem 0;
  border-top: 1px solid var(--about-line-soft);
}

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

.page-about .about-rhythm__cycle {
  font-family: var(--mono);
  font-size: 0.8rem;
  letter-spacing: 0.1em;
  color: var(--amber);
}

.page-about .about-rhythm__desc {
  font-size: 0.97rem;
  line-height: 1.78;
}

/* ---------- 团队分组 ---------- */
.page-about .about-team {
  display: grid;
  gap: 0;
  margin: 1.6rem 0 1.9rem;
  border-top: 1px solid rgba(16, 32, 29, 0.16);
}

.page-about .about-team__group {
  padding: 1.15rem 0;
  border-bottom: 1px solid rgba(16, 32, 29, 0.16);
}

.page-about .about-team__no {
  margin: 0 0 0.4rem;
  font-family: var(--mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-team__name {
  margin: 0 0 0.5rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.15rem;
  letter-spacing: 0.01em;
  color: var(--text-ink);
}

.page-about .about-team__desc {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(16, 32, 29, 0.78);
}

/* ---------- 版本节点 ---------- */
.page-about .about-track {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-track__item {
  position: relative;
  display: grid;
  grid-template-columns: 3.25rem minmax(0, 1fr);
  gap: 1rem;
  padding: 1.15rem 0;
  border-top: 1px solid var(--about-line-soft);
}

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

.page-about .about-track__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: -2px;
  width: 0;
  height: 2px;
  background: var(--amber);
  transform: skewX(var(--skew));
  transition: width 0.24s var(--ease);
  pointer-events: none;
}

.page-about .about-track__item:hover::before,
.page-about .about-track__item:focus-within::before {
  width: 56px;
}

.page-about .about-track__no {
  font-family: var(--mono);
  font-size: 1rem;
  line-height: 1.5;
  color: var(--neutral);
  transition: color 0.18s var(--ease);
}

.page-about .about-track__item:hover .about-track__no,
.page-about .about-track__item:focus-within .about-track__no {
  color: var(--amber);
}

.page-about .about-track__body {
  min-width: 0;
}

.page-about .about-track__title {
  margin: 0 0 0.35rem;
  font-family: var(--display);
  font-weight: 700;
  font-size: 1.08rem;
  line-height: 1.35;
  color: var(--about-ink-strong);
}

.page-about .about-track__desc {
  margin: 0;
  font-size: 0.93rem;
  line-height: 1.78;
  color: var(--about-ink-text);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta-band {
  border-top: 1px solid var(--about-line-soft);
}

.page-about .about-cta {
  padding-top: clamp(2.75rem, 6vw, 4.5rem);
  padding-bottom: clamp(2.75rem, 6vw, 4.5rem);
}

.page-about .about-cta h2 {
  margin: 0 0 0.7rem;
  font-family: var(--display);
  font-weight: 900;
  font-size: clamp(1.5rem, 3.4vw, 2.1rem);
  line-height: 1.18;
  color: var(--about-ink-strong);
}

.page-about .about-cta p {
  margin: 0 0 1.6rem;
  max-width: 52ch;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-ink-text);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.85rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-compare {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0;
    background: transparent;
    border-top: 0;
  }

  .page-about .about-compare__cell {
    padding: 0 1.5rem 0 0;
  }

  .page-about .about-compare__cell + .about-compare__cell {
    padding-left: 1.5rem;
    border-left: 1px solid var(--about-line-soft);
  }

  .page-about .about-rhythm__item {
    grid-template-columns: 8.5rem minmax(0, 1fr);
    gap: 1.5rem;
    align-items: baseline;
  }
}

@media (min-width: 880px) {
  .page-about .about-chapter {
    grid-template-columns: minmax(0, 3.5fr) minmax(0, 8.5fr);
    gap: 3rem;
  }

  .page-about .about-chapter__rail {
    position: sticky;
    top: 7.5rem;
    align-self: start;
    flex-direction: column;
    align-items: flex-start;
    gap: 1.1rem;
  }

  .page-about .about-chapter__body {
    max-width: none;
  }

  .page-about .about-chapter__body--split {
    display: grid;
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    gap: 2.5rem;
    align-items: start;
  }

  .page-about .about-chapter__body--split .about-chapter__text {
    max-width: 56ch;
  }

  .page-about .about-team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0 2rem;
  }

  .page-about .about-team__group {
    padding: 1.3rem 0 1.4rem;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4.2fr);
    gap: 4rem;
    align-items: end;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-track__item::before,
  .page-about .about-track__no {
    transition: none;
  }

  .page-about .about-track__item::before {
    width: 28px;
  }
}
<<<END>>>