.page-about {
  display: block;
  padding-bottom: 80px;
  overflow-x: clip;
}

/* ---------- 页头 ---------- */
.page-about .hist-intro {
  padding: 22px 0 0;
}

.page-about .hist-intro__kicker {
  display: inline-block;
  margin: 0 0 18px;
  padding: 5px 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--green);
  background: var(--green-glow);
  border: 1px solid rgba(198, 255, 0, 0.3);
  clip-path: polygon(9px 0, 100% 0, 100% calc(100% - 9px), calc(100% - 9px) 100%, 0 100%, 0 9px);
}

.page-about .hist-intro__title {
  margin: 0 0 20px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-size: clamp(2.05rem, 7vw, 4.4rem);
  line-height: 1.03;
  letter-spacing: -0.02em;
  color: var(--white);
}

.page-about .hist-intro__lead {
  margin: 0 0 30px;
  max-width: 62ch;
  font-size: 1.0625rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .hist-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

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

.page-about .hist-stat__value {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
  font-variant-numeric: tabular-nums;
}

.page-about .hist-stat__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 横幅 ---------- */
.page-about .hist-banner {
  position: relative;
  margin: 30px 0 0;
  overflow: hidden;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 18px), calc(100% - 18px) 100%, 0 100%);
}

.page-about .hist-banner img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1600 / 480;
  object-fit: cover;
}

.page-about .hist-banner::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--green), var(--blue) 58%, transparent);
}

/* ---------- 通用标题 ---------- */
.page-about .hist-heading {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.4vw, 2.5rem);
  line-height: 1.14;
  letter-spacing: -0.015em;
  color: var(--white);
}

/* ---------- 版本时间轴 ---------- */
.page-about .hist-versions,
.page-about .hist-team,
.page-about .hist-cadence,
.page-about .hist-next {
  padding-top: 64px;
}

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

.page-about .hist-versions__lead,
.page-about .hist-cadence__lead {
  margin: 0;
  max-width: 60ch;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .hist-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 34px;
}

.page-about .hist-track {
  position: relative;
  margin: 0;
  padding: 0 0 0 28px;
  list-style: none;
}

.page-about .hist-track::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange) 0%, var(--green) 22%, var(--blue) 62%, rgba(0, 229, 255, 0.14) 100%);
}

.page-about .hist-node {
  position: relative;
  padding-bottom: 48px;
}

.page-about .hist-node--last {
  padding-bottom: 0;
}

.page-about .hist-node::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 14px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 92, 34, 0.16), 0 0 14px rgba(255, 92, 34, 0.45);
}

.page-about .hist-card {
  position: relative;
  overflow: hidden;
  padding: 22px 20px 24px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--cut)), calc(100% - var(--cut)) 100%, 0 100%);
}

.page-about .hist-card__mark {
  position: absolute;
  right: 10px;
  bottom: -12px;
  font-family: var(--font-display);
  font-size: clamp(3.2rem, 9vw, 5.6rem);
  line-height: 0.82;
  letter-spacing: -0.04em;
  color: rgba(232, 237, 242, 0.05);
  pointer-events: none;
  user-select: none;
}

.page-about .hist-card__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  margin-bottom: 14px;
}

.page-about .hist-card__year {
  font-family: var(--font-mono);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .hist-card__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.1rem, 3vw, 1.45rem);
  line-height: 1.24;
  color: var(--white);
}

.page-about .hist-card > p {
  margin: 0 0 12px;
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(232, 237, 242, 0.8);
}

.page-about .hist-card > p:last-of-type {
  margin-bottom: 0;
}

/* 折叠面板 */
.page-about .hist-more {
  margin-top: 18px;
  padding-top: 12px;
  border-top: 1px solid var(--line);
}

.page-about .hist-more__summary {
  display: flex;
  align-items: center;
  gap: 8px;
  padding: 4px 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue);
  cursor: pointer;
  list-style: none;
}

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

.page-about .hist-more__summary::after {
  content: "+";
  margin-left: auto;
  font-size: 15px;
  line-height: 1;
  color: var(--blue);
}

.page-about .hist-more[open] .hist-more__summary::after {
  content: "–";
}

.page-about .hist-more__summary:focus-visible {
  outline: 1px solid var(--blue);
  outline-offset: 3px;
}

.page-about .hist-more__body {
  padding: 10px 0 2px;
}

.page-about .hist-more__body p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--muted);
}

/* 图片 */
.page-about .hist-figure {
  margin: 18px 0 0;
  overflow: hidden;
  background: var(--ink);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

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

/* 旁注索引 */
.page-about .hist-aside {
  padding: 18px 16px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .hist-aside__title {
  margin: 0 0 14px;
  padding-bottom: 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  border-bottom: 1px solid var(--line);
}

.page-about .hist-aside__list {
  display: flex;
  flex-direction: column;
  gap: 2px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .hist-aside__list a {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 8px 8px 8px 10px;
  font-size: 0.875rem;
  color: var(--white);
  text-decoration: none;
  border-left: 2px solid transparent;
  transition: border-color 240ms var(--ease), background 240ms var(--ease), color 240ms var(--ease);
}

.page-about .hist-aside__list a:hover,
.page-about .hist-aside__list a:focus-visible {
  border-left-color: var(--green);
  background: var(--green-glow);
  color: var(--green);
}

.page-about .hist-aside__list .mono {
  flex: none;
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--blue);
}

.page-about .hist-aside__box {
  margin-top: 18px;
  padding: 14px;
  background: var(--teal);
  border: 1px solid rgba(0, 229, 255, 0.2);
}

.page-about .hist-aside__box-title {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--blue);
}

.page-about .hist-aside__facts {
  display: flex;
  flex-direction: column;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .hist-aside__facts li {
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 斜线分隔 ---------- */
.page-about .hist-slash {
  height: 16px;
  margin: 56px 0 0;
  background-image: repeating-linear-gradient(45deg, var(--line) 0 1px, transparent 1px 10px);
  opacity: 0.9;
}

/* ---------- 团队 ---------- */
.page-about .hist-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
}

.page-about .hist-team__body p {
  margin: 0 0 14px;
  font-size: 0.9375rem;
  line-height: 1.9;
  color: rgba(232, 237, 242, 0.8);
}

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

.page-about .hist-figure--team {
  margin: 0;
}

.page-about .hist-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

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

.page-about .hist-band__value {
  font-family: var(--font-mono);
  font-size: 1.45rem;
  font-weight: 700;
  line-height: 1;
  color: var(--blue);
  font-variant-numeric: tabular-nums;
}

.page-about .hist-band__label {
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 更新节奏 ---------- */
.page-about .hist-cadence__lead {
  margin-bottom: 26px;
}

.page-about .hist-steps {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .hist-step {
  display: flex;
  flex-direction: column;
  gap: 9px;
  padding: 20px 18px 22px;
  background: var(--ink-2);
}

.page-about .hist-step__num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .hist-step__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.05rem;
  line-height: 1.36;
  color: var(--white);
}

.page-about .hist-step p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 延伸入口 ---------- */
.page-about .hist-next__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 22px;
}

.page-about .hist-next__card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 22px 20px;
  background: var(--ink-2);
  border: 1px solid var(--line);
  color: inherit;
  text-decoration: none;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 16px), calc(100% - 16px) 100%, 0 100%);
  transition: background 240ms var(--ease), transform 240ms var(--ease);
}

.page-about .hist-next__card:hover,
.page-about .hist-next__card:focus-visible {
  background: var(--teal);
  transform: translateY(-2px);
}

.page-about .hist-next__card-title {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.1rem;
  line-height: 1.3;
  color: var(--white);
}

.page-about .hist-next__card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .hist-next__card-arrow {
  margin-top: auto;
  padding-top: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--green);
}

/* ---------- 断点 ---------- */
@media (min-width: 768px) {
  .page-about {
    padding-bottom: 110px;
  }

  .page-about .hist-intro {
    padding-top: 30px;
  }

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

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

  .page-about .hist-stat__value {
    font-size: 1.95rem;
  }

  .page-about .hist-versions,
  .page-about .hist-team,
  .page-about .hist-cadence,
  .page-about .hist-next {
    padding-top: 88px;
  }

  .page-about .hist-card {
    padding: 28px 26px 30px;
  }

  .page-about .hist-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

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

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

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

  .page-about .hist-slash {
    margin-top: 76px;
  }
}

@media (min-width: 1024px) {
  .page-about .hist-layout {
    grid-template-columns: minmax(0, 2.1fr) minmax(210px, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .hist-aside {
    position: sticky;
    top: 76px;
    align-self: start;
  }

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

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

  .page-about .hist-node::before {
    left: -34px;
  }
}

@media (min-width: 1280px) {
  .page-about .hist-card {
    padding: 30px 32px 34px;
  }

  .page-about .hist-intro__lead {
    font-size: 1.125rem;
  }
}

/* ---------- 降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 1ms !important;
    animation-duration: 1ms !important;
    animation-iteration-count: 1 !important;
    transform: none !important;
  }
}
<<<END>>>