.page-about {
  --about-axis-w: 168px;
  --about-rule: var(--ky-line-soft);
  background: var(--ky-ink);
  color: var(--ky-snow);
  overflow-x: hidden;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 20px 0 44px;
  background:
    radial-gradient(120% 80% at 88% 0%, rgba(34, 211, 238, 0.10), transparent 62%),
    repeating-linear-gradient(0deg, rgba(38, 51, 73, 0.32) 0 1px, transparent 1px 64px);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: start;
}

.page-about .about-hero__title {
  margin: 14px 0 20px;
  font-family: var(--ky-font-serif);
  font-weight: 900;
  font-size: clamp(34px, 8vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  color: var(--ky-snow);
}

.page-about .about-hero__intro {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ky-fog);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 30px;
  border: 2px solid var(--ky-line);
  background: var(--ky-line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--ky-ink-2);
}

.page-about .about-stat__num {
  font-family: var(--ky-font-mono);
  font-size: 30px;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ky-cyan);
}

.page-about .about-stat__unit {
  font-size: 15px;
  margin-left: 2px;
  color: var(--ky-mist);
}

.page-about .about-stat__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--ky-mist);
}

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

.page-about .about-hero__media .ky-media {
  border: 2px solid var(--ky-line);
  overflow: hidden;
}

.page-about .ky-media__img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  max-width: 100%;
}

.page-about .about-hero__caption {
  margin-top: 10px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.03em;
  color: var(--ky-mist);
}

/* ---------- 章节流 ---------- */
.page-about .about-stream {
  padding-top: 8px;
  padding-bottom: 12px;
}

.page-about .about-chapter {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 10px;
  padding: 34px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-chapter:first-child {
  border-top: 0;
}

.page-about .about-chapter__axis {
  align-self: start;
}

.page-about .about-chapter__num {
  display: inline-block;
  font-family: var(--ky-font-mono);
  font-size: clamp(48px, 11vw, 96px);
  line-height: 0.86;
  letter-spacing: -0.04em;
  color: var(--ky-line);
  text-decoration: none;
  transition: color 180ms ease;
}

.page-about .about-chapter__num:hover,
.page-about .about-chapter__num:focus-visible {
  color: var(--ky-cyan-deep);
}

.page-about .about-chapter__num[aria-current="true"] {
  color: var(--ky-cyan);
}

.page-about .about-chapter__title {
  margin: 0 0 16px;
  font-family: var(--ky-font-serif);
  font-weight: 600;
  font-size: clamp(23px, 4.4vw, 36px);
  line-height: 1.28;
  letter-spacing: -0.01em;
  color: var(--ky-snow);
}

.page-about .about-chapter__body p {
  margin: 0 0 14px;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ky-fog);
}

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

.page-about .about-link {
  color: var(--ky-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(34, 211, 238, 0.45);
  padding-bottom: 1px;
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--ky-snow);
  border-bottom-color: var(--ky-snow);
}

/* ---------- 版本三级台阶 ---------- */
.page-about .about-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 26px 0 0;
  background: var(--about-rule);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-step {
  padding: 18px 0;
  background: var(--ky-ink);
}

.page-about .about-step__code {
  margin: 0 0 8px;
  font-family: var(--ky-font-mono);
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--ky-amber);
}

.page-about .about-step__name {
  margin: 0 0 8px;
  font-family: var(--ky-font-serif);
  font-weight: 600;
  font-size: 20px;
  line-height: 1.35;
  color: var(--ky-snow);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ky-mist);
}

.page-about .about-step--lead .about-step__code {
  color: var(--ky-cyan);
}

.page-about .about-step--lead .about-step__name {
  color: var(--ky-cyan);
}

/* ---------- 阶梯 SVG ---------- */
.page-about .about-ladder-wrap {
  margin: 30px 0 26px;
  padding: 14px 0 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-ladder {
  display: block;
  width: 100%;
  height: auto;
  max-width: 760px;
}

.page-about .about-ladder__base {
  stroke: var(--ky-line);
  stroke-width: 2;
}

.page-about .about-ladder__bar rect {
  fill: var(--ky-ink-2);
  stroke: var(--ky-line);
  stroke-width: 2;
}

.page-about .about-ladder__bar--now rect {
  fill: var(--ky-cyan-deep);
  stroke: var(--ky-cyan);
}

.page-about .about-ladder__code {
  font-family: var(--ky-font-mono);
  font-size: 30px;
  letter-spacing: 0.04em;
  fill: var(--ky-snow);
  text-anchor: middle;
}

.page-about .about-ladder__val {
  font-family: var(--ky-font-mono);
  font-size: 17px;
  letter-spacing: 0.04em;
  fill: var(--ky-mist);
  text-anchor: middle;
}

.page-about .about-ladder__bar--now .about-ladder__val {
  fill: var(--ky-snow);
}

.page-about .about-ladder__caption {
  margin-top: 12px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  line-height: 1.7;
  color: var(--ky-mist);
}

.page-about .about-wide {
  margin: 26px 0 0;
}

.page-about .about-wide .ky-media {
  border: 2px solid var(--ky-line);
  overflow: hidden;
}

/* ---------- 团队分工 ---------- */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin-top: 22px;
  background: var(--about-rule);
  border: 1px solid var(--about-rule);
}

.page-about .about-role {
  padding: 16px;
  background: var(--ky-ink-2);
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin: 0 0 8px;
  font-family: var(--ky-font-serif);
  font-weight: 600;
  font-size: 18px;
  color: var(--ky-snow);
}

.page-about .about-role__num {
  font-family: var(--ky-font-mono);
  font-size: 24px;
  line-height: 1;
  color: var(--ky-cyan);
}

.page-about .about-role p:last-child {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ky-mist);
  max-width: none;
}

/* ---------- 反白数字带 ---------- */
.page-about .about-band {
  margin: 40px 0;
  padding: 26px 20px 30px;
  background: var(--ky-snow);
  color: var(--ky-ink);
  border: 2px solid var(--ky-ink);
  box-shadow: 10px 10px 0 rgba(34, 211, 238, 0.30);
}

.page-about .about-band__eyebrow {
  margin: 0 0 10px;
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: rgba(11, 17, 32, 0.6);
}

.page-about .about-band__title {
  margin: 0;
  font-family: var(--ky-font-serif);
  font-weight: 600;
  font-size: clamp(21px, 4vw, 30px);
  line-height: 1.3;
  color: var(--ky-ink);
}

.page-about .about-band__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 18px;
  margin-top: 24px;
}

.page-about .about-band__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  border-top: 2px solid var(--ky-ink);
  padding-top: 10px;
}

.page-about .about-band__num {
  font-family: var(--ky-font-mono);
  font-size: 28px;
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--ky-ink);
}

.page-about .about-band__unit {
  font-size: 15px;
  margin-left: 2px;
  color: rgba(11, 17, 32, 0.62);
}

.page-about .about-band__label {
  font-size: 13px;
  line-height: 1.6;
  color: rgba(11, 17, 32, 0.72);
}

/* ---------- 登记信息 ---------- */
.page-about .about-registry {
  margin: 22px 0 20px;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-registry__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 4px;
  padding: 14px 0;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-registry dt {
  font-family: var(--ky-font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ky-mist);
}

.page-about .about-registry dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ky-snow);
  word-break: break-word;
}

.page-about .about-registry__note {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  color: var(--ky-mist);
}

/* ---------- 结尾 ---------- */
.page-about .about-outro {
  margin-top: 46px;
  padding: 30px 0 20px;
  border-top: 2px solid var(--ky-line);
}

.page-about .about-outro__title {
  margin: 0 0 12px;
  font-family: var(--ky-font-serif);
  font-weight: 600;
  font-size: clamp(22px, 4vw, 32px);
  line-height: 1.3;
  color: var(--ky-snow);
}

.page-about .about-outro__text {
  margin: 0 0 22px;
  max-width: 60ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ky-mist);
}

.page-about .about-outro__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-outro__links .ky-btn {
  text-decoration: none;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero {
    padding: 28px 0 56px;
  }

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

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

  .page-about .about-step {
    padding: 20px 20px 22px;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-step:first-child {
    border-left: 0;
    padding-left: 0;
  }

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

  .page-about .about-registry__row {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 56px;
  }

  .page-about .about-chapter {
    grid-template-columns: var(--about-axis-w) minmax(0, 1fr);
    gap: 44px;
    padding: 52px 0;
  }

  .page-about .about-chapter__axis {
    position: sticky;
    top: calc(var(--ky-header-h-sm) + 32px);
  }

  .page-about .about-band {
    padding: 34px 36px 38px;
    margin: 48px 0;
  }

  .page-about .about-band__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .about-registry__row {
    grid-template-columns: 160px minmax(0, 1fr);
  }
}

@media (min-width: 1200px) {
  .page-about .about-hero__grid {
    gap: 72px;
  }

  .page-about .about-chapter {
    gap: 64px;
  }

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

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