.page-about {
  --about-rule: var(--line);
  --about-soft: rgba(18, 28, 46, .55);
}

/* 面包屑间距 */
.page-about .breadcrumb {
  padding-top: 28px;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  margin-top: 30px;
  margin-bottom: 36px;
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(30px, 5.4vw, 54px);
  line-height: 1.14;
  letter-spacing: .015em;
  font-weight: 800;
  color: var(--text);
  margin: 14px 0 22px;
  max-width: 900px;
}

.page-about .about-lead {
  font-size: 17px;
  line-height: 1.85;
  color: var(--muted);
  max-width: 720px;
  margin: 0;
}

/* ============ 全宽视觉断点 ============ */
.page-about .about-banner {
  margin: 0 0 8px;
  padding: 0;
}

.page-about .about-banner__frame {
  position: relative;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
}

.page-about .about-banner__frame::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(180deg, rgba(10, 17, 32, 0) 45%, rgba(10, 17, 32, .72) 100%);
  pointer-events: none;
}

.page-about .about-banner__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 7;
  object-fit: cover;
}

.page-about .about-banner__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: var(--muted);
  max-width: 720px;
}

/* ============ 主体三栏 ============ */
.page-about .about-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  margin-top: 56px;
  align-items: start;
}

.page-about .about-rail {
  order: 1;
  min-width: 0;
}

.page-about .about-flow {
  order: 2;
  min-width: 0;
}

.page-about .about-stats {
  order: 3;
  min-width: 0;
}

/* ============ 时间线 ============ */
.page-about .about-rail__eyebrow {
  margin-bottom: 14px;
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 18px;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--accent), var(--line) 78%);
  opacity: .7;
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 22px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -18px;
  top: 6px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  box-sizing: border-box;
}

.page-about .timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .timeline__link {
  display: block;
  text-decoration: none;
  color: inherit;
  border-radius: var(--radius-sm);
  padding: 2px 4px 2px 0;
  transition: transform 200ms var(--ease);
}

.page-about .timeline__link:hover .timeline__title,
.page-about .timeline__link:focus-visible .timeline__title {
  color: var(--accent);
}

.page-about .timeline__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.page-about .timeline__year {
  display: block;
  font-size: 20px;
  line-height: 1.1;
  letter-spacing: .02em;
}

.page-about .timeline__title {
  display: block;
  margin-top: 4px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--muted);
  transition: color 200ms var(--ease);
}

.page-about .about-rail__hint {
  margin: 20px 0 0;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .08em;
  color: var(--muted);
  opacity: .8;
}

/* ============ 内容段落 ============ */
.page-about .about-section {
  padding-bottom: 52px;
  border-bottom: 1px solid var(--about-rule);
  margin-bottom: 52px;
  scroll-margin-top: 110px;
}

.page-about .about-section:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-section__head {
  margin-bottom: 18px;
}

.page-about .about-section__title {
  font-family: var(--font-head);
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.22;
  letter-spacing: .02em;
  font-weight: 700;
  color: var(--text);
  margin: 8px 0 0;
}

.page-about .about-section__body > .prose p {
  margin: 0 0 18px;
}

.page-about .about-section__body > .prose p:last-child {
  margin-bottom: 0;
}

/* ============ 插图 ============ */
.page-about .about-figure {
  margin: 28px 0 0;
}

.page-about .about-figure__frame {
  border-radius: var(--radius-md);
  overflow: hidden;
  background: var(--panel);
  border: 1px solid var(--line);
}

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

.page-about .about-figure__frame--landscape img {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure__frame--square {
  max-width: 560px;
}

.page-about .about-figure__frame--square img {
  aspect-ratio: 1 / 1;
}

.page-about .about-figure__caption {
  margin-top: 12px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  max-width: 620px;
}

/* ============ 节奏卡片 ============ */
.page-about .cadence-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-bottom: 24px;
}

.page-about .cadence-card {
  position: relative;
  padding: 20px 20px 22px;
  border-radius: var(--radius-md);
  background: var(--panel);
  border: 1px solid var(--line);
  overflow: hidden;
}

.page-about .cadence-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--accent);
  opacity: .85;
}

.page-about .cadence-card__cycle {
  margin: 0 0 10px;
  color: var(--muted);
}

.page-about .cadence-card__num {
  margin: 0;
  font-size: clamp(26px, 4vw, 34px);
  line-height: 1;
  letter-spacing: .01em;
}

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

.page-about .about-cadence__note {
  margin-top: 4px;
}

/* ============ 下一步 ============ */
.page-about .about-next__lead {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--muted);
}

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

.page-about .about-next__link {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 6px;
  padding: 22px 22px 24px;
  border-radius: var(--radius-lg);
  background: linear-gradient(150deg, var(--panel) 0%, rgba(18, 28, 46, .6) 100%);
  border: 1px solid var(--line);
  text-decoration: none;
  color: inherit;
  transition: border-color 200ms var(--ease), transform 200ms var(--ease);
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--accent);
  transform: translateY(-2px);
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--accent);
  outline-offset: 3px;
}

.page-about .about-next__code {
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--accent);
}

.page-about .about-next__title {
  font-family: var(--font-head);
  font-size: 18px;
  line-height: 1.4;
  font-weight: 700;
  color: var(--text);
}

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

/* ============ 侧边规模数据 ============ */
.page-about .about-stats {
  margin-top: 4px;
}

.page-about .about-stats__card {
  border-radius: var(--radius-lg);
  background: var(--panel);
  border: 1px solid var(--line);
  padding: 22px 20px 24px;
  position: relative;
  overflow: hidden;
}

.page-about .about-stats__card::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 3px;
  background: linear-gradient(90deg, var(--accent), var(--accent-2), transparent);
  opacity: .9;
}

.page-about .about-stats__title {
  margin: 0 0 16px;
  color: var(--muted);
}

.page-about .about-stats__row {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 12px 0;
  border-top: 1px solid var(--about-rule);
}

.page-about .about-stats__row:first-of-type {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-stats__num {
  font-size: 26px;
  line-height: 1;
  letter-spacing: .01em;
  flex: none;
}

.page-about .about-stats__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

/* ============ 平板：时间线 + 内容双栏 ============ */
@media (min-width: 760px) {
  .page-about .about-body {
    grid-template-columns: 190px minmax(0, 1fr);
    gap: 36px 40px;
  }

  .page-about .about-rail {
    grid-column: 1;
    grid-row: 1 / span 2;
  }

  .page-about .about-flow {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-stats {
    grid-column: 2;
    grid-row: 2;
    margin-top: 0;
  }

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

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

/* ============ 宽屏：三栏，数据栏粘性跟随 ============ */
@media (min-width: 1120px) {
  .page-about .about-body {
    grid-template-columns: 200px minmax(0, 1fr) 232px;
    gap: 56px;
  }

  .page-about .about-rail {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-flow {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-stats {
    grid-column: 3;
    grid-row: 1;
    position: sticky;
    top: 104px;
    align-self: start;
  }

  .page-about .about-figure__frame--square {
    max-width: 460px;
  }
}

@media (min-width: 1320px) {
  .page-about .about-body {
    grid-template-columns: 216px minmax(0, 1fr) 252px;
    gap: 64px;
  }
}
<<<END>>>