.page-about {
  --axis-w: 232px;
  --about-rule: #D8C9A8;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 24px 0 52px;
  border-bottom: 2px solid var(--line-strong);
  background:
    radial-gradient(120% 92% at 94% -6%, rgba(201, 154, 46, 0.24) 0%, rgba(201, 154, 46, 0) 58%),
    linear-gradient(180deg, var(--paper-deep) 0%, var(--paper) 62%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--red) 0%, var(--gold) 46%, transparent 100%);
  opacity: 0.65;
}

.page-about .about-hero .breadcrumb {
  position: relative;
  z-index: 1;
  margin-bottom: 22px;
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-kicker {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--gold-dark);
}

.page-about .about-title {
  margin: 14px 0 20px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(28px, 5.8vw, 54px);
  line-height: 1.18;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .title-sub {
  display: block;
  margin-top: 12px;
  font-size: 0.5em;
  line-height: 1.45;
  color: var(--red);
  letter-spacing: 0.03em;
}

.page-about .about-lede {
  max-width: 46ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-stats li {
  padding-top: 10px;
  border-top: 3px solid var(--gold);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 24px;
  line-height: 1.1;
  color: var(--ink);
}

.page-about .stat-num em {
  font-style: normal;
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--ink-soft);
}

.page-about .stat-cap {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  color: var(--ink-soft);
}

.page-about .about-hero-figure {
  position: relative;
  margin: 0;
  border: 3px solid var(--ink);
  background: var(--cream);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
}

.page-about .hero-seal {
  position: absolute;
  top: -14px;
  right: -10px;
  z-index: 2;
  display: grid;
  place-items: center;
  width: 58px;
  height: 58px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--cream);
  background: var(--red);
  border: 2px solid var(--cream);
  box-shadow: 3px 3px 0 rgba(36, 28, 23, 0.45);
  transform: rotate(6deg);
}

.page-about .hero-caption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line-strong);
}

@media (min-width: 960px) {
  .page-about .about-hero {
    padding: 28px 0 72px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 1.12fr 0.88fr;
    align-items: end;
    column-gap: 56px;
  }

  .page-about .about-hero-figure {
    transform: rotate(-1.4deg);
  }

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

/* ---------- 主体：左轴 + 右栏 ---------- */
.page-about .about-body {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
  padding-top: 40px;
  padding-bottom: 72px;
}

.page-about .axis-label {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--gold-dark);
}

.page-about .axis-list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  overflow-x: auto;
  list-style: none;
  -webkit-overflow-scrolling: touch;
}

.page-about .axis-item {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  gap: 6px;
}

.page-about .axis-link {
  display: inline-block;
  padding: 7px 13px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  color: var(--ink);
  text-decoration: none;
  background: var(--cream);
  border: 2px solid var(--line-strong);
  border-radius: 2px;
  transition: color 0.18s ease, border-color 0.18s ease, background-color 0.18s ease;
}

.page-about .axis-link:hover,
.page-about .axis-link:focus-visible {
  color: var(--cream);
  background: var(--red);
  border-color: var(--red);
}

.page-about .axis-years {
  display: inline-flex;
  gap: 4px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .axis-year {
  display: inline-block;
  padding: 5px 7px;
  font-family: var(--font-mono);
  font-size: 11px;
  font-weight: 600;
  color: var(--jade);
  text-decoration: none;
  background: var(--jade-light);
  border-radius: 2px;
}

.page-about .axis-year:hover,
.page-about .axis-year:focus-visible {
  color: var(--cream);
  background: var(--jade);
}

@media (min-width: 960px) {
  .page-about .about-body {
    grid-template-columns: var(--axis-w) minmax(0, 1fr);
    column-gap: 56px;
    padding-top: 56px;
  }

  .page-about .about-axis {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    align-self: start;
  }

  .page-about .axis-list {
    display: block;
    overflow: visible;
    padding: 2px 0 2px 18px;
    border-left: 2px solid var(--gold);
  }

  .page-about .axis-item {
    display: block;
    margin-bottom: 16px;
  }

  .page-about .axis-link {
    display: block;
    padding: 0;
    font-size: 15px;
    background: transparent;
    border: none;
  }

  .page-about .axis-link:hover,
  .page-about .axis-link:focus-visible {
    color: var(--red);
    background: transparent;
  }

  .page-about .axis-years {
    display: flex;
    flex-wrap: wrap;
    margin-top: 8px;
  }
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  margin-bottom: 68px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-sec:last-of-type {
  margin-bottom: 56px;
}

.page-about .sec-head {
  margin-bottom: 22px;
}

.page-about .sec-kicker {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold-dark);
}

.page-about .sec-title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(22px, 3.6vw, 34px);
  line-height: 1.28;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .sec-title::after {
  content: "";
  display: block;
  width: 54px;
  height: 4px;
  margin-top: 14px;
  background: linear-gradient(90deg, var(--red), var(--gold));
}

.page-about .sec-text {
  max-width: 62ch;
  margin: 0 0 16px;
  font-size: 16px;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* ---------- 起点 ---------- */
.page-about .origin-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .origin-copy {
  padding: 22px 20px;
  background: var(--cream);
  border: 2px solid var(--ink);
  border-left-width: 8px;
  border-left-color: var(--red);
  box-shadow: var(--shadow-hard);
}

.page-about .origin-note {
  position: relative;
  padding: 20px 20px 20px 24px;
  background: var(--jade-light);
  border: 1px dashed var(--jade);
}

.page-about .note-mark {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 20px;
  color: var(--jade);
}

.page-about .note-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .page-about .origin-panel {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 团队分工（纯 CSS 标签页） ---------- */
.page-about .team-tabs {
  margin-top: 8px;
}

.page-about .team-tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.page-about .team-tab {
  display: inline-block;
  padding: 9px 16px;
  font-size: 14px;
  font-weight: 600;
  color: var(--ink);
  background: var(--cream);
  border: 2px solid var(--ink);
  border-radius: 2px;
  box-shadow: 3px 3px 0 rgba(36, 28, 23, 0.22);
  cursor: pointer;
  user-select: none;
  transition: background-color 0.18s ease, color 0.18s ease, box-shadow 0.18s ease, transform 0.18s ease;
}

.page-about .team-tab:hover {
  transform: translate(-1px, -1px);
  box-shadow: 4px 4px 0 rgba(36, 28, 23, 0.22);
}

.page-about #team-rule:checked ~ .team-tablist [for="team-rule"],
.page-about #team-data:checked ~ .team-tablist [for="team-data"],
.page-about #team-visual:checked ~ .team-tablist [for="team-visual"],
.page-about #team-support:checked ~ .team-tablist [for="team-support"] {
  color: var(--cream);
  background: var(--red);
  box-shadow: 3px 3px 0 var(--ink);
}

.page-about #team-rule:focus-visible ~ .team-tablist [for="team-rule"],
.page-about #team-data:focus-visible ~ .team-tablist [for="team-data"],
.page-about #team-visual:focus-visible ~ .team-tablist [for="team-visual"],
.page-about #team-support:focus-visible ~ .team-tablist [for="team-support"] {
  outline: 3px solid var(--orange);
  outline-offset: 3px;
}

.page-about .team-panel {
  display: none;
  padding: 24px 20px;
  background: var(--cream);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about #team-rule:checked ~ .team-panels [data-panel="rule"],
.page-about #team-data:checked ~ .team-panels [data-panel="data"],
.page-about #team-visual:checked ~ .team-panels [data-panel="visual"],
.page-about #team-support:checked ~ .team-panels [data-panel="support"] {
  display: block;
  animation: about-fade 180ms ease-out both;
}

@keyframes about-fade {
  from {
    opacity: 0;
    transform: translateY(6px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.page-about .panel-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--red);
}

.page-about .panel-text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--ink-soft);
}

.page-about .panel-list {
  margin: 0;
  padding: 0;
  list-style: none;
  border-top: 1px dashed var(--line-strong);
}

.page-about .panel-list li {
  position: relative;
  padding: 9px 0 9px 18px;
  font-size: 14px;
  color: var(--ink);
  border-bottom: 1px dashed var(--line-strong);
}

.page-about .panel-list li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 17px;
  width: 7px;
  height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
}

/* ---------- 归档体系 ---------- */
.page-about .archive-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 26px;
}

.page-about .archive-figure {
  margin: 0;
  border: 3px solid var(--ink);
  background: var(--cream);
  box-shadow: var(--shadow-hard);
}

.page-about .archive-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 4;
  object-fit: cover;
}

.page-about .archive-figure figcaption {
  padding: 9px 13px;
  font-size: 12px;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line-strong);
}

.page-about .archive-list {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .archive-item {
  display: flex;
  gap: 14px;
  padding: 16px;
  background: var(--paper-deep);
  border: 1px solid var(--line-strong);
}

.page-about .archive-seal {
  flex: 0 0 auto;
  align-self: flex-start;
  padding: 5px 8px;
  font-family: var(--font-display);
  font-size: 13px;
  font-weight: 700;
  color: var(--cream);
  background: var(--gold-dark);
  letter-spacing: 0.06em;
}

.page-about .archive-title {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .archive-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .page-about .archive-grid {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.28fr);
    align-items: start;
  }
}

/* ---------- 版本演进 ---------- */
.page-about .milestone-figure {
  margin: 0 0 26px;
  border: 2px solid var(--line-strong);
  background: var(--cream);
}

.page-about .milestone-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

.page-about .milestone-figure figcaption {
  padding: 9px 14px;
  font-size: 12px;
  color: var(--ink-soft);
  border-top: 1px dashed var(--line-strong);
}

.page-about .mile-list {
  position: relative;
  margin: 0;
  padding: 0 0 0 22px;
  list-style: none;
  border-left: 2px solid var(--gold);
}

.page-about .mile-item {
  position: relative;
  margin-bottom: 16px;
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .mile-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 20px;
  width: 12px;
  height: 12px;
  background: var(--red);
  border: 2px solid var(--paper);
  transform: rotate(45deg);
}

.page-about .mile-item--now::before {
  background: var(--jade);
}

.page-about .mile-card {
  background: var(--cream);
  border: 2px solid var(--ink);
  box-shadow: 4px 4px 0 rgba(36, 28, 23, 0.18);
}

.page-about .mile-summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .mile-summary:hover .mile-head {
  color: var(--red);
}

.page-about .mile-year {
  flex: 0 0 auto;
  padding: 4px 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--ink);
  background: var(--gold);
}

.page-about .mile-item--now .mile-year {
  color: var(--cream);
  background: var(--jade);
}

.page-about .mile-head {
  flex: 1 1 auto;
  font-family: var(--font-display);
  font-size: 16px;
  font-weight: 700;
  line-height: 1.45;
  color: var(--ink);
  transition: color 0.18s ease;
}

.page-about .mile-toggle {
  flex: 0 0 auto;
  position: relative;
  width: 18px;
  height: 18px;
  border: 2px solid var(--ink-soft);
}

.page-about .mile-toggle::before,
.page-about .mile-toggle::after {
  content: "";
  position: absolute;
  left: 50%;
  top: 50%;
  background: var(--ink-soft);
  transform: translate(-50%, -50%);
}

.page-about .mile-toggle::before {
  width: 10px;
  height: 2px;
}

.page-about .mile-toggle::after {
  width: 2px;
  height: 10px;
  transition: opacity 0.18s ease;
}

.page-about .mile-card[open] .mile-toggle::after {
  opacity: 0;
}

.page-about .mile-body {
  padding: 0 18px 18px;
  border-top: 1px dashed var(--line-strong);
}

.page-about .mile-body p {
  margin: 14px 0 0;
  font-size: 14px;
  line-height: 1.9;
  color: var(--ink-soft);
}

/* ---------- 互校伙伴 ---------- */
.page-about .partner-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin: 0 0 22px;
  padding: 0;
  list-style: none;
}

.page-about .partner-card {
  position: relative;
  padding: 22px 20px 18px;
  background: var(--cream);
  border: 2px solid var(--ink);
  box-shadow: var(--shadow-hard);
  transition: transform 0.2s ease, background-color 0.2s ease;
}

.page-about .partner-card:hover,
.page-about .partner-card:focus-within {
  transform: translateY(-3px);
  background: var(--paper-deep);
}

.page-about .partner-seal {
  position: absolute;
  top: -12px;
  right: 16px;
  display: grid;
  place-items: center;
  width: 42px;
  height: 42px;
  font-family: var(--font-display);
  font-size: 15px;
  font-weight: 700;
  color: var(--cream);
  background: var(--red);
  border: 2px solid var(--cream);
  transform: rotate(-5deg);
}

.page-about .partner-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .partner-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .partner-extra {
  max-height: 0;
  margin: 0;
  overflow: hidden;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--jade);
  opacity: 0;
  transition: max-height 0.24s ease, opacity 0.24s ease, margin-top 0.24s ease;
}

.page-about .partner-card:hover .partner-extra,
.page-about .partner-card:focus-within .partner-extra {
  max-height: 60px;
  margin-top: 12px;
  opacity: 1;
}

.page-about .cadence-card {
  padding: 20px;
  background: var(--ink);
  color: var(--paper);
  border: 2px solid var(--ink);
}

.page-about .cadence-title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--gold);
}

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

.page-about .cadence-list li {
  display: flex;
  gap: 12px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(246, 238, 223, 0.86);
}

.page-about .cadence-num {
  flex: 0 0 auto;
  min-width: 48px;
  padding: 2px 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  text-align: center;
  color: var(--ink);
  background: var(--gold);
}

@media (min-width: 720px) {
  .page-about .partner-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  padding: 28px 20px 30px;
  background: var(--cream);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .next-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 26px);
  font-weight: 800;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .next-lede {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .next-card {
  display: block;
  height: 100%;
  padding: 16px 16px 18px;
  text-decoration: none;
  background: var(--paper);
  border: 2px solid var(--line-strong);
  transition: border-color 0.18s ease, background-color 0.18s ease, transform 0.18s ease;
}

.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  background: var(--paper-deep);
  border-color: var(--red);
  transform: translateY(-2px);
}

.page-about .next-kicker {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--gold-dark);
}

.page-about .next-name {
  display: block;
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--red);
}

.page-about .next-desc {
  display: block;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ink-soft);
}

@media (min-width: 720px) {
  .page-about .about-next {
    padding: 34px 28px 36px;
  }

  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 1080px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .team-panel,
  .page-about .partner-card,
  .page-about .next-card,
  .page-about .team-tab,
  .page-about .mile-head,
  .page-about .partner-extra {
    animation: none;
    transition: none;
  }

  .page-about .partner-card:hover,
  .page-about .partner-card:focus-within,
  .page-about .next-card:hover,
  .page-about .next-card:focus-visible,
  .page-about .team-tab:hover {
    transform: none;
  }
}
<<<END>>>