.page-about {
  --about-panel-grad: linear-gradient(158deg, rgba(13, 36, 56, 0.94) 0%, rgba(8, 26, 43, 0.72) 100%);
  --about-soft-line: rgba(30, 65, 89, 0.85);
  padding-bottom: 72px;
}

.page-about .breadcrumb {
  margin: 18px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: 18px;
  padding: 26px 0 6px;
  background-image: radial-gradient(70% 130% at 10% 0%, rgba(49, 244, 228, 0.10), transparent 68%);
}

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

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 8.4vw, 58px);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 20ch;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 3.9vw, 17px);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 6px;
}

.page-about .about-stat {
  position: relative;
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius-sm);
  background: var(--about-panel-grad);
  padding: 14px 14px 12px;
  overflow: hidden;
}

.page-about .about-stat::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 2px;
  background: linear-gradient(90deg, var(--cyan), rgba(49, 244, 228, 0) 72%);
  opacity: 0.75;
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 6.2vw, 28px);
  font-weight: 700;
  line-height: 1.1;
  color: var(--text);
}

.page-about .about-stat__unit {
  font-size: 12px;
  color: var(--cyan);
  margin-left: 2px;
}

.page-about .about-stat__label {
  margin: 7px 0 0;
  font-size: 12.5px;
  letter-spacing: 0.02em;
  color: var(--muted);
}

/* ---------- 双栏骨架 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 34px;
  margin-top: 38px;
}

/* ---------- 左侧地标图例 ---------- */
.page-about .about-legend {
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  background: var(--about-panel-grad);
  padding: 18px 16px 16px;
}

.page-about .about-legend__title {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--mist);
}

.page-about .about-legend__list {
  list-style: none;
  margin: 14px 0 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-legend__link {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  align-items: baseline;
  gap: 8px;
  padding: 9px 10px;
  border-left: 2px solid transparent;
  border-radius: 10px;
  color: var(--muted);
  font-size: 14px;
  text-decoration: none;
  transition: color 0.22s var(--ease), background-color 0.22s var(--ease), border-color 0.22s var(--ease);
}

.page-about .about-legend__link:hover,
.page-about .about-legend__link:focus-visible {
  color: var(--text);
  background-color: rgba(13, 36, 56, 0.78);
  border-left-color: var(--cyan);
}

.page-about .about-legend__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.08em;
  color: var(--cyan);
}

.page-about .about-legend__foot {
  margin: 16px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--about-soft-line);
  font-size: 12px;
  line-height: 1.7;
  color: var(--muted);
}

/* ---------- 右侧正文流 ---------- */
.page-about .about-flow {
  display: grid;
  gap: 52px;
  min-width: 0;
}

.page-about .about-chapter {
  scroll-margin-top: 24px;
  min-width: 0;
}

.page-about .about-chapter::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: 22px;
  background: linear-gradient(90deg, rgba(49, 244, 228, 0.62) 0%, rgba(49, 244, 228, 0.12) 44%, rgba(30, 65, 89, 0) 100%);
}

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

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

.page-about .about-chapter__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(23px, 5vw, 34px);
  font-weight: 800;
  letter-spacing: -0.01em;
  line-height: 1.2;
}

.page-about .about-text {
  margin: 0 0 18px;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-text--tight {
  margin-top: 14px;
  margin-bottom: 18px;
  font-size: 14.5px;
}

/* ---------- 地标卡 ---------- */
.page-about .legend-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .legend-card {
  position: relative;
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  background: var(--about-panel-grad);
  padding: 16px 16px 14px;
  overflow: hidden;
  transition: border-color 0.24s var(--ease), transform 0.24s var(--ease);
}

.page-about .legend-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 60%;
  height: 60%;
  background: radial-gradient(circle at 0 0, rgba(49, 244, 228, 0.14), transparent 72%);
  pointer-events: none;
}

.page-about .legend-card:hover {
  border-color: rgba(49, 244, 228, 0.5);
}

.page-about .legend-card__coord {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mist);
}

.page-about .legend-card__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  color: var(--text);
}

.page-about .legend-card__text {
  margin: 0 0 12px;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .legend-card__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(49, 244, 228, 0.4);
  padding-bottom: 2px;
}

.page-about .legend-card__link:hover,
.page-about .legend-card__link:focus-visible {
  color: var(--text);
  border-bottom-color: var(--text);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 20px;
}

.page-about .about-chapter .about-figure + * {
  margin-top: 0;
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  background: var(--ink-1);
  object-fit: cover;
}

.page-about .about-figure .media__caption {
  margin-top: 9px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.05em;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 阶段切换 ---------- */
.page-about .about-tabs {
  margin-top: 18px;
}

.page-about .about-tabs .tabs__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: thin;
}

.page-about .about-tabs .tabs__tab {
  flex: 0 0 auto;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  padding: 8px 14px;
  border: 1px solid var(--about-soft-line);
  border-radius: 999px;
  background-color: transparent;
  color: var(--muted);
  cursor: pointer;
  transition: color 0.2s var(--ease), background-color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-tabs .tabs__tab:hover {
  color: var(--text);
  border-color: rgba(49, 244, 228, 0.5);
}

.page-about .about-tabs .tabs__tab[aria-selected="true"] {
  background-color: var(--cyan);
  border-color: var(--cyan);
  color: var(--ink-0);
  font-weight: 700;
}

.page-about .about-tabs .tabs__tab:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .about-tabs .tabs__panel {
  margin-top: 18px;
  padding: 2px 0 2px 16px;
  border-left: 2px solid rgba(49, 244, 228, 0.55);
}

.page-about .about-stage__year {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-stage__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-stage__text {
  margin: 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 维护节奏 ---------- */
.page-about .about-rhythm {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .about-rhythm__item {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 13px 14px;
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius-sm);
  background-color: rgba(13, 36, 56, 0.55);
}

.page-about .about-rhythm__cycle {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: 0.1em;
  color: var(--amber);
}

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

/* ---------- 流程步骤 ---------- */
.page-about .about-steps {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
  display: grid;
  gap: 12px;
  counter-reset: about-step;
}

.page-about .about-step {
  position: relative;
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  background: var(--about-panel-grad);
  padding: 16px 16px 15px;
}

.page-about .about-step__num {
  display: inline-block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 20px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-step__title {
  margin: 0 0 7px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 联络面板 ---------- */
.page-about .about-contact {
  display: grid;
  gap: 2px;
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius);
  background: var(--about-panel-grad);
  padding: 8px 16px;
  margin-bottom: 6px;
}

.page-about .about-contact__row {
  display: grid;
  gap: 3px;
  padding: 12px 0;
  border-bottom: 1px solid rgba(30, 65, 89, 0.7);
}

.page-about .about-contact__row:last-child {
  border-bottom: 0;
}

.page-about .about-contact__label {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-contact__value {
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
  word-break: break-word;
}

/* ---------- 底部入口 ---------- */
.page-about .about-next {
  display: grid;
  grid-template-columns: 1fr;
  gap: 10px;
  margin-top: 8px;
}

.page-about .about-next__link {
  display: grid;
  gap: 6px;
  padding: 15px 16px;
  border: 1px solid var(--about-soft-line);
  border-radius: var(--radius-sm);
  background-color: rgba(13, 36, 56, 0.6);
  text-decoration: none;
  transition: border-color 0.22s var(--ease), background-color 0.22s var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: rgba(49, 244, 228, 0.55);
  background-color: rgba(13, 36, 56, 0.9);
}

.page-about .about-next__kicker {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .about-next__label {
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

.page-about .about-next__link:hover .about-next__label {
  color: var(--text);
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .legend-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-rhythm__item {
    grid-template-columns: 88px minmax(0, 1fr);
  }

  .page-about .about-contact__row {
    grid-template-columns: 140px minmax(0, 1fr);
    align-items: baseline;
    gap: 14px;
  }

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

@media (min-width: 700px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

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

@media (min-width: 900px) {
  .page-about {
    padding-bottom: 96px;
  }

  .page-about .about-hero {
    gap: 22px;
    padding-top: 34px;
  }

  .page-about .about-layout {
    grid-template-columns: 248px minmax(0, 1fr);
    gap: 56px;
    margin-top: 48px;
  }

  .page-about .about-legend {
    position: sticky;
    top: 24px;
    align-self: start;
    padding: 20px 18px 18px;
  }

  .page-about .about-flow {
    gap: 64px;
  }

  .page-about .about-text {
    font-size: 17px;
  }

  .page-about .about-stage__title {
    font-size: 20px;
  }

  .page-about .about-stage__text {
    font-size: 15.5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .legend-card,
  .page-about .legend-card__link,
  .page-about .about-legend__link,
  .page-about .about-next__link,
  .page-about .about-tabs .tabs__tab {
    transition: none;
  }
}
<<<END>>>