.page-about .ak-breadcrumb {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(22px, 4vw, 40px);
  padding: clamp(28px, 5vw, 60px) 0 clamp(30px, 5vw, 56px);
  border-bottom: 1px solid var(--line);
  isolation: isolate;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: 0;
  bottom: 0;
  left: calc(-1 * var(--gutter));
  right: calc(-1 * var(--gutter));
  background:
    radial-gradient(110% 130% at 88% -18%, rgba(184, 255, 60, 0.16) 0%, rgba(184, 255, 60, 0) 60%),
    linear-gradient(158deg, var(--ink-2) 0%, var(--ink-1) 52%, var(--ink-0) 100%);
  clip-path: polygon(0 0, 100% 0, 100% 68%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero__kicker {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--mint);
}

.page-about .about-hero__kicker::before {
  content: "";
  width: 34px;
  height: 1px;
  background: var(--acid);
}

.page-about .about-hero h1 {
  margin: 0 0 20px;
  max-width: 14em;
  font-size: clamp(32px, 6.2vw, 66px);
  line-height: 1.08;
  letter-spacing: -0.03em;
}

.page-about .about-hero__lead {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

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

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

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 章节索引 ---------- */
.page-about .about-index {
  display: grid;
  gap: 12px;
  padding: 20px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-index__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
}

.page-about .about-index__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 3px;
  font-size: 14px;
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--fast) var(--ease), border-color var(--fast) var(--ease);
}

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

.page-about .about-index__list .ak-num {
  font-size: 11px;
  color: var(--mint);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-section {
  display: grid;
  gap: 16px;
  padding: clamp(32px, 5vw, 60px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-section__rail {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-section__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--acid);
}

.page-about .about-section__name {
  font-size: 11px;
  letter-spacing: 0.28em;
  color: var(--muted);
  padding-left: 10px;
  border-left: 1px solid var(--accent, var(--acid));
}

.page-about .about-section h2 {
  margin: 0 0 16px;
}

.page-about .about-section h3 {
  margin: 0 0 10px;
  font-size: clamp(18px, 2vw, 22px);
}

.page-about .about-section p {
  margin: 0 0 14px;
}

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

.page-about .about-note {
  margin-top: 20px;
  padding: 16px 18px;
  background: var(--ink-1);
  border-left: 2px solid var(--acid);
  color: var(--paper);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- 版本时间线 ---------- */
.page-about .about-media-strip {
  margin: 0 0 26px;
}

.page-about .about-media-strip img,
.page-about .about-inline-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

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

.page-about .about-timeline__item {
  position: relative;
  margin-left: 4px;
  padding: 0 0 28px 24px;
  border-left: 1px solid var(--line);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -4px;
  top: 7px;
  width: 7px;
  height: 7px;
  background: var(--acid);
}

.page-about .about-timeline__marker {
  display: flex;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 12px;
}

.page-about .about-timeline__v {
  font-family: var(--font-mono);
  font-size: 20px;
  letter-spacing: 0.06em;
  color: var(--acid);
}

.page-about .about-timeline__stage {
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--muted);
}

.page-about .about-timeline__card {
  padding: 18px 20px;
}

.page-about .about-timeline__card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 流程 ---------- */
.page-about .about-flow {
  display: none;
  width: 100%;
  height: auto;
  margin: 0 0 24px;
}

.page-about .about-flow__line {
  stroke: var(--line);
  stroke-width: 1.5;
}

.page-about .about-flow__dot circle {
  fill: var(--ink-0);
  stroke: var(--acid);
  stroke-width: 2;
}

.page-about .about-flow__label text {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 16px;
  letter-spacing: 0.06em;
}

.page-about .about-steps {
  display: grid;
  gap: 10px;
  margin-bottom: 26px;
}

.page-about .about-step {
  background: var(--ink-1);
  border: 1px solid var(--line);
}

.page-about .about-step[open] {
  border-color: var(--deep);
  background: var(--ink-2);
}

.page-about .about-step__summary {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 14px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--paper);
}

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

.page-about .about-step__index {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--acid);
}

.page-about .about-step__title {
  font-size: 16px;
  font-weight: 700;
  letter-spacing: 0.01em;
}

.page-about .about-step__time {
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--mint);
  white-space: nowrap;
}

.page-about .about-step__body {
  padding: 0 16px 16px;
  border-top: 1px solid var(--line);
  padding-top: 14px;
}

.page-about .about-step__body p {
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

.page-about .about-inline-figure {
  margin: 0;
}

/* ---------- 团队数据条带 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  border-top: 1px solid var(--line);
  border-left: 1px solid var(--line);
}

.page-about .about-stats__cell {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 16px;
  border-right: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--ink-1);
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 36px);
  line-height: 1;
  color: var(--acid);
  letter-spacing: -0.02em;
}

.page-about .about-stats__key {
  font-size: 13px;
  color: var(--muted);
  letter-spacing: 0.04em;
}

/* ---------- 合作标签 ---------- */
.page-about .about-tags {
  list-style: none;
  margin: 22px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 覆盖范围 ---------- */
.page-about .about-scope {
  margin: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-scope__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-scope dt {
  font-size: 17px;
  font-weight: 700;
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-scope dt .ak-num {
  font-family: var(--font-mono);
  color: var(--signal);
  font-size: 1.05em;
}

.page-about .about-scope dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 结尾入口 ---------- */
.page-about .about-cta {
  padding: clamp(34px, 5vw, 64px) 0 clamp(20px, 3vw, 36px);
}

.page-about .about-cta h2 {
  margin: 0 0 22px;
  font-size: clamp(26px, 3.4vw, 38px);
}

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

.page-about .about-cta__link {
  display: grid;
  gap: 6px;
  padding: 18px 20px;
  background: var(--ink-1);
  border: 1px solid var(--line);
  text-decoration: none;
  color: var(--paper);
  transition: border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-cta__link:hover,
.page-about .about-cta__link:focus-visible {
  border-color: var(--acid);
  background: var(--ink-2);
}

.page-about .about-cta__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--acid);
}

.page-about .about-cta__link strong {
  font-size: 18px;
  letter-spacing: -0.01em;
}

.page-about .about-cta__link span:last-child {
  font-size: 14px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 平板与桌面 ---------- */
@media (min-width: 720px) {
  .page-about .about-flow {
    display: block;
  }

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

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

  .page-about .about-scope__row {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: baseline;
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: start;
    column-gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-hero__figure {
    margin-top: 44px;
  }

  .page-about .about-section {
    grid-template-columns: 96px minmax(0, 1fr);
    column-gap: clamp(20px, 3vw, 40px);
    align-items: start;
  }

  .page-about .about-section__rail {
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
    padding-top: 6px;
    position: sticky;
    top: 24px;
  }

  .page-about .about-section__name {
    writing-mode: vertical-rl;
    padding-left: 0;
    padding-top: 10px;
    border-left: 0;
    border-top: 1px solid var(--acid);
    letter-spacing: 0.32em;
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    column-gap: 26px;
    padding-left: 28px;
    padding-bottom: 22px;
  }

  .page-about .about-timeline__marker {
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
    margin-bottom: 0;
  }

  .page-about .about-timeline__card {
    padding: 20px 24px;
  }

  .page-about .about-cta__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-section {
    grid-template-columns: 120px minmax(0, 1fr);
  }

  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
}

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