.page-about {
  background-color: var(--ink);
  background-image:
    linear-gradient(to right, rgba(30, 58, 82, 0.26) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(30, 58, 82, 0.26) 1px, transparent 1px);
  background-size: 96px 96px;
  color: var(--paper);
  padding-top: clamp(18px, 3vw, 34px);
  padding-bottom: clamp(56px, 9vw, 110px);
  overflow-x: hidden;
}

.page-about .breadcrumb {
  margin-bottom: clamp(20px, 3vw, 34px);
}

/* ---------- 首屏 ---------- */
.page-about .hist-hero {
  display: grid;
  gap: clamp(26px, 5vw, 48px);
  align-items: start;
  padding-bottom: clamp(30px, 5vw, 56px);
}

.page-about .hist-hero-main h1 {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2rem, 7.2vw, 4.4rem);
  line-height: 1.1;
  letter-spacing: -0.035em;
  margin: 14px 0 0;
  max-width: 15em;
}

.page-about .hist-lede {
  margin: 20px 0 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.85;
  color: var(--mist);
  max-width: 36em;
}

.page-about .hist-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .hist-hero-rail {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border-top: 2px solid var(--cyan);
}

.page-about .hist-rail-item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px 18px;
  background: var(--panel-bg);
  border-left: 2px solid transparent;
  transition: border-color 0.25s var(--ease), background 0.25s var(--ease);
}

.page-about .hist-rail-item:hover {
  background: var(--ink-2);
  border-left-color: var(--cyan);
}

.page-about .hist-rail-num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.35rem, 3.6vw, 1.9rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .hist-rail-label {
  font-size: 12.5px;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 章节索引 ---------- */
.page-about .hist-index {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  padding-top: 12px;
}

.page-about .hist-index-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 12px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .hist-index-list::-webkit-scrollbar {
  display: none;
}

.page-about .hist-index-list a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 9px 15px;
  border: 1px solid var(--line);
  border-radius: 999px;
  color: var(--mist);
  font-size: 13px;
  text-decoration: none;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), background 0.2s var(--ease);
}

.page-about .hist-index-list a .mono {
  font-family: var(--font-mono);
  font-size: 11px;
  opacity: 0.75;
}

.page-about .hist-index-list a:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .hist-index-list a[aria-current="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .hist-timeline {
  padding-top: clamp(36px, 6vw, 66px);
}

.page-about .hist-stage {
  position: relative;
  margin-top: clamp(42px, 7vw, 78px);
}

.page-about .hist-stage:first-child {
  margin-top: 0;
}

.page-about .hist-stage-head {
  display: flex;
  align-items: flex-start;
  gap: clamp(14px, 3vw, 26px);
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .hist-stage-no {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(2.2rem, 6.4vw, 4.2rem);
  line-height: 0.9;
  letter-spacing: -0.04em;
  color: transparent;
  -webkit-text-stroke: 1.5px rgba(159, 179, 200, 0.5);
  flex: none;
}

.page-about .hist-stage-title h2 {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.5rem, 3.6vw, 2.5rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  margin: 10px 0 0;
}

.page-about .hist-stage-title .tag {
  display: inline-block;
}

.page-about .hist-stage-body {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .hist-stage-copy {
  padding: clamp(18px, 3vw, 30px);
}

.page-about .hist-stage-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

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

.page-about .hist-points {
  display: grid;
  gap: 12px;
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .hist-points li {
  position: relative;
  padding-left: 20px;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .hist-points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 8px;
  border: 1.5px solid var(--cyan);
  transform: rotate(45deg);
}

.page-about .hist-points strong {
  color: var(--paper);
  font-weight: 600;
}

.page-about .hist-legacy {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-top: 18px !important;
  padding: 12px 14px;
  border-left: 3px solid var(--orange);
  background: rgba(255, 122, 61, 0.08);
  color: var(--paper) !important;
  font-size: 14px;
}

.page-about .hist-fig {
  margin: 0;
}

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

.page-about .hist-fig figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
  letter-spacing: 0.02em;
}

/* ---------- 横向数据带 ---------- */
.page-about .hist-band {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(22px, 3vw, 34px);
  background: var(--line-soft);
  border: 1px solid var(--line);
}

.page-about .hist-band-item {
  padding: 18px 16px 20px;
  background: var(--ink-soft);
  transition: background 0.25s var(--ease);
}

.page-about .hist-band-item:hover {
  background: var(--ink-2);
}

.page-about .hist-band-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.5rem, 4vw, 2.2rem);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .hist-band-unit {
  display: block;
  margin-top: 6px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--paper);
}

.page-about .hist-band-note {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.7;
  color: var(--mist);
  opacity: 0.65;
  transition: opacity 0.25s var(--ease), color 0.25s var(--ease);
}

.page-about .hist-band-item:hover .hist-band-note {
  opacity: 1;
  color: var(--paper);
}

/* ---------- 团队与值班 ---------- */
.page-about .hist-team {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .hist-team-side {
  position: relative;
  padding: clamp(20px, 3vw, 30px);
  background: linear-gradient(140deg, rgba(45, 226, 230, 0.14), rgba(10, 34, 56, 0.6) 62%);
  border: 1px solid var(--line);
  clip-path: polygon(0 0, calc(100% - var(--cut)) 0, 100% var(--cut), 100% 100%, 0 100%);
}

.page-about .hist-team-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(3.4rem, 12vw, 6rem);
  line-height: 0.9;
  letter-spacing: -0.05em;
  color: var(--paper);
}

.page-about .hist-team-cap {
  margin: 16px 0 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--mist);
  max-width: 26em;
}

.page-about .hist-team-list {
  display: grid;
  gap: 1px;
  margin: 0;
  padding: 0;
  list-style: none;
  background: var(--line-soft);
  border-top: 2px solid var(--orange);
}

.page-about .hist-team-list li {
  padding: 16px 18px 18px;
  background: var(--panel-bg);
}

.page-about .hist-team-key {
  display: inline-block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  letter-spacing: 0.02em;
  color: var(--cyan);
  margin-bottom: 8px;
}

.page-about .hist-team-list p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 坚持的做法 ---------- */
.page-about .hist-rules {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border-left: 2px solid var(--cyan);
}

.page-about .hist-rule {
  padding: 20px 18px 22px;
  background: var(--ink-soft);
  transition: background 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .hist-rule:hover {
  background: var(--ink-2);
}

.page-about .hist-rule-no {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
}

.page-about .hist-rule h3 {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.05rem, 2.4vw, 1.3rem);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .hist-rule p {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 收口 ---------- */
.page-about .hist-close {
  margin-top: clamp(48px, 8vw, 92px);
  padding-top: clamp(28px, 4vw, 44px);
  border-top: 1px solid var(--line);
}

.page-about .hist-close-line {
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.9rem, 6.4vw, 3.6rem);
  line-height: 1.14;
  letter-spacing: -0.035em;
  margin: 12px 0 0;
}

.page-about .hist-close-sub {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--mist);
}

.page-about .hist-close-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 断点 ---------- */
@media (min-width: 720px) {
  .page-about .hist-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .hist-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    gap: clamp(36px, 5vw, 72px);
    padding-bottom: clamp(40px, 5vw, 64px);
  }

  .page-about .hist-index-list {
    flex-wrap: wrap;
    overflow: visible;
    padding-bottom: 14px;
  }

  .page-about .hist-timeline {
    position: relative;
    padding-left: 72px;
  }

  .page-about .hist-timeline::before {
    content: "";
    position: absolute;
    left: 19px;
    top: 74px;
    bottom: 24px;
    width: 2px;
    background: linear-gradient(180deg, var(--cyan), rgba(45, 226, 230, 0.06) 92%);
  }

  .page-about .hist-stage::before {
    content: "";
    position: absolute;
    left: -59px;
    top: 16px;
    width: 12px;
    height: 12px;
    border: 2px solid var(--cyan);
    border-radius: 50%;
    background: var(--ink);
  }

  .page-about .hist-stage-body {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(26px, 4vw, 48px);
  }

  .page-about .hist-stage:nth-of-type(even) .hist-stage-body > .hist-stage-copy {
    order: 2;
  }

  .page-about .hist-stage:nth-of-type(even) .hist-stage-body > .hist-fig {
    order: 1;
  }
}

@media (min-width: 1100px) {
  .page-about .hist-rules {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .hist-rule {
    padding: 24px 20px 26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .hist-rail-item,
  .page-about .hist-band-item,
  .page-about .hist-band-note,
  .page-about .hist-rule,
  .page-about .hist-index-list a {
    transition: none;
  }
}
<<<END>>>