.page-about {
  --about-shadow: 0 12px 30px rgba(22, 48, 42, 0.08);
  padding-bottom: var(--space-4);
  color: var(--ink);
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .index-label {
  margin: 0;
  color: var(--mist);
}

.page-about h2 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(26px, 4.6vw, 42px);
  line-height: 1.26;
  letter-spacing: -0.01em;
  color: var(--ink-deep);
  margin: 10px 0 14px;
}

.page-about .lead,
.page-about .section-lead {
  font-family: var(--font-body);
  color: var(--ink);
  line-height: 1.85;
}

.page-about .lead {
  max-width: 48ch;
  margin: 0;
  font-size: 17px;
}

.page-about .section-head {
  max-width: 66ch;
  margin-bottom: var(--space-2);
}

.page-about .section-lead {
  margin: 0;
  font-size: 16.5px;
}

.page-about .dropcap::first-letter {
  float: left;
  font-family: var(--font-heading);
  font-size: 3.1em;
  line-height: 0.95;
  padding: 0.08em 0.14em 0 0;
  color: var(--winter);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--space-2);
  padding-top: var(--space-2);
  padding-bottom: var(--space-3);
}

.page-about .hero-copy h1 {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: clamp(34px, 7.6vw, 62px);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--ink-deep);
  margin: 14px 0 22px;
}

.page-about .hero-stats {
  margin: var(--space-2) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 20px 18px;
}

.page-about .stat {
  border-top: 1px solid rgba(22, 48, 42, 0.2);
  padding-top: 12px;
}

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

.page-about .stat dd {
  margin: 8px 0 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .stat-num {
  font-family: var(--font-mono);
  font-size: clamp(30px, 6vw, 46px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-deep);
}

.page-about .stat-unit {
  font-size: 14px;
  color: var(--mist);
}

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

.page-about .hero-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 9 / 10;
  object-fit: cover;
  border-radius: var(--radius-card);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  padding-top: var(--space-3);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--spring), var(--summer), var(--autumn), var(--winter));
}

.page-about .tl-item {
  --season: var(--winter);
  position: relative;
  margin-bottom: var(--space-2);
}

.page-about .tl-item:last-child {
  margin-bottom: 0;
}

.page-about .tl-item--spring { --season: var(--spring); }
.page-about .tl-item--summer { --season: var(--summer); }
.page-about .tl-item--autumn { --season: var(--autumn); }
.page-about .tl-item--winter { --season: var(--winter); }

.page-about .tl-dot {
  position: absolute;
  left: -26px;
  top: 26px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--season);
  box-shadow: 0 0 0 4px var(--paper);
}

.page-about .tl-card {
  background: var(--paper-warm);
  border-radius: var(--radius-card);
  padding: 20px 22px 22px;
  box-shadow: var(--about-shadow);
  transition: box-shadow 240ms var(--ease-soft);
}

.page-about .tl-card[open] {
  box-shadow: inset 4px 0 0 var(--season), var(--about-shadow);
}

.page-about .tl-card summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 16px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .tl-year {
  font-family: var(--font-mono);
  font-size: clamp(32px, 7vw, 52px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--ink-deep);
}

.page-about .tl-title {
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 500;
  color: var(--ink);
}

.page-about .tl-card p {
  margin: 14px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink);
}

/* ---------- 区域小组 ---------- */
.page-about .about-regions {
  margin-top: var(--space-3);
  padding: var(--space-3) 0;
  background:
    linear-gradient(
      158deg,
      var(--paper-warm) 0%,
      var(--paper-warm) 52%,
      rgba(110, 166, 190, 0.26) 52.4%,
      rgba(62, 106, 85, 0.16) 100%
    );
}

.page-about .regions-grid {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .region-card {
  --season: var(--winter);
  position: relative;
  overflow: hidden;
  background: var(--paper);
  border-radius: var(--radius-card);
  padding: 28px 22px 24px;
  box-shadow: var(--about-shadow);
}

.page-about .region-card::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 5px;
  background: var(--season);
}

.page-about .region-card--spring { --season: var(--spring); }
.page-about .region-card--summer { --season: var(--summer); }
.page-about .region-card--autumn { --season: var(--autumn); }
.page-about .region-card--winter { --season: var(--winter); }

.page-about .region-card h3 {
  font-family: var(--font-heading);
  font-size: 21px;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--ink-deep);
}

.page-about .region-card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

.page-about .region-card--note {
  background: var(--ink);
}

.page-about .region-card--note::before {
  background: linear-gradient(90deg, var(--spring), var(--summer), var(--autumn), var(--winter));
}

.page-about .region-card--note h3 {
  color: var(--paper);
  font-size: 19px;
}

.page-about .region-card--note p {
  color: rgba(247, 243, 234, 0.86);
}

/* ---------- 人员认证 ---------- */
.page-about .about-people {
  display: grid;
  gap: var(--space-2);
  padding-top: var(--space-4);
}

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

.page-about .people-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.page-about .steps {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .steps li {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding-top: 18px;
  border-top: 1px dashed rgba(22, 48, 42, 0.22);
}

.page-about .step-no {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--winter);
  padding-top: 5px;
}

.page-about .steps h3 {
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 500;
  margin: 0 0 6px;
  color: var(--ink-deep);
}

.page-about .steps p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
}

/* ---------- 四季节奏 ---------- */
.page-about .about-seasons {
  padding-top: var(--space-4);
}

.page-about .season-figure {
  margin: 0 0 var(--space-2);
}

.page-about .season-figure img {
  display: block;
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border-radius: var(--radius-card);
}

.page-about .season-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .season-card {
  --season: var(--winter);
  position: relative;
  overflow: hidden;
  border-radius: var(--radius-card);
  padding: 24px 22px 26px;
  background: var(--paper-warm);
}

.page-about .season-card > * {
  position: relative;
  z-index: 1;
}

.page-about .season-card::after {
  content: "";
  position: absolute;
  right: -34px;
  bottom: -34px;
  width: 108px;
  height: 108px;
  border-radius: 50%;
  background: var(--season);
  opacity: 0.55;
}

.page-about .season-card--spring { --season: var(--spring); }
.page-about .season-card--summer { --season: var(--summer); }
.page-about .season-card--autumn { --season: var(--autumn); }
.page-about .season-card--winter { --season: var(--winter); }

.page-about .season-card h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  margin: 8px 0 10px;
  color: var(--ink-deep);
}

.page-about .season-card p:last-child {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--ink);
}

/* ---------- 标准与流程 ---------- */
.page-about .about-standard {
  padding-top: var(--space-4);
  display: grid;
  gap: var(--space-2);
}

.page-about .flow {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
}

.page-about .flow li {
  display: grid;
  grid-template-columns: 30px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px 0;
  border-top: 1px dashed rgba(22, 48, 42, 0.22);
}

.page-about .flow-no {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 26px;
  height: 26px;
  border-radius: var(--radius-pill);
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--paper);
  background: var(--winter);
}

.page-about .flow li:nth-child(1) .flow-no { background: var(--spring); color: var(--ink-deep); }
.page-about .flow li:nth-child(2) .flow-no { background: var(--summer); color: var(--ink-deep); }
.page-about .flow li:nth-child(3) .flow-no { background: var(--autumn); color: var(--ink-deep); }
.page-about .flow li:nth-child(4) .flow-no { background: var(--winter); }

.page-about .flow h3 {
  font-family: var(--font-heading);
  font-size: 18px;
  font-weight: 500;
  margin: 2px 0 6px;
  color: var(--ink-deep);
}

.page-about .flow p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .standard-tail {
  margin: var(--space-2) 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--autumn);
  background: var(--paper-warm);
  border-radius: 0 var(--radius-card) var(--radius-card) 0;
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .standard-note {
  background: var(--ink);
  color: var(--paper);
  border-radius: var(--radius-card);
  padding: 28px 24px 26px;
}

.page-about .standard-note .index-label {
  color: rgba(247, 243, 234, 0.62);
}

.page-about .note-num {
  margin: 12px 0 14px;
  display: flex;
  align-items: baseline;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: clamp(48px, 10vw, 64px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--paper);
}

.page-about .note-num span {
  font-family: var(--font-body);
  font-size: 15px;
  letter-spacing: 0.02em;
  color: rgba(247, 243, 234, 0.72);
}

.page-about .note-text {
  margin: 0 0 22px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 243, 234, 0.86);
}

.page-about .standard-note .btn--ghost {
  color: var(--paper);
  border-color: rgba(247, 243, 234, 0.5);
}

/* ---------- 延伸入口 ---------- */
.page-about .about-next {
  padding-top: var(--space-4);
}

.page-about .next-list {
  list-style: none;
  margin: var(--space-2) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .next-list a {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 24px;
  border-radius: var(--radius-card);
  background: var(--paper-warm);
  text-decoration: none;
  color: var(--ink);
  transition: transform 220ms var(--ease-soft), background 220ms var(--ease-soft), box-shadow 220ms var(--ease-soft);
}

.page-about .next-list a:hover,
.page-about .next-list a:focus-visible {
  transform: translateY(-2px);
  background: var(--paper);
  box-shadow: var(--about-shadow);
}

.page-about .next-title {
  font-family: var(--font-heading);
  font-size: 19px;
  font-weight: 500;
  line-height: 1.5;
  color: var(--ink-deep);
}

/* ---------- 平板 ---------- */
@media (min-width: 680px) {
  .page-about .regions-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .season-cards {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 18px;
  }

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

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

/* ---------- 桌面 ---------- */
@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: 7fr 5fr;
    gap: var(--space-3);
    align-items: start;
    padding-bottom: var(--space-4);
  }

  .page-about .hero-figure {
    margin-top: 12px;
  }

  .page-about .timeline {
    padding-left: 40px;
  }

  .page-about .timeline::before {
    left: 6px;
  }

  .page-about .tl-dot {
    left: -40px;
  }

  .page-about .tl-item {
    margin-bottom: 72px;
  }

  .page-about .tl-item:nth-child(even) {
    margin-left: 40px;
  }

  .page-about .tl-card {
    padding: 24px 30px 26px;
  }

  .page-about .tl-title {
    font-size: 21px;
  }

  .page-about .about-people {
    grid-template-columns: 5fr 7fr;
    gap: var(--space-3);
    align-items: start;
  }

  .page-about .people-figure {
    position: sticky;
    top: 104px;
  }

  .page-about .about-standard {
    grid-template-columns: 7fr 4fr;
    gap: var(--space-3);
    align-items: start;
  }

  .page-about .standard-note {
    position: sticky;
    top: 104px;
  }
}

@media (min-width: 1060px) {
  .page-about .regions-grid {
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 20px;
  }

  .page-about .regions-grid > li {
    grid-column: span 2;
  }

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

  .page-about .season-card:nth-child(even) {
    margin-top: 36px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .next-list a {
    transition: none;
  }

  .page-about .next-list a:hover,
  .page-about .next-list a:focus-visible {
    transform: none;
  }
}
<<<END>>>