.page-about {
  --about-rail: 250px;
  --about-gap: clamp(20px, 3vw, 46px);
  --about-line: rgba(11, 59, 90, 0.12);
  background: var(--mist);
  color: var(--ink);
  padding-bottom: clamp(48px, 7vw, 96px);
}

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

.page-about .about-crumb {
  padding-top: clamp(18px, 3vw, 30px);
}

.page-about .breadcrumbs {
  font-size: 12.5px;
  letter-spacing: 0.04em;
  color: var(--slate);
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
}

.page-about .breadcrumbs a {
  color: var(--lake-mid);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover,
.page-about .breadcrumbs a:focus-visible {
  color: var(--sunrise);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  display: grid;
  gap: var(--about-gap);
  padding-top: clamp(16px, 2.5vw, 26px);
  padding-bottom: clamp(34px, 5vw, 70px);
}

.page-about .about-hero__title {
  font-size: clamp(30px, 7.2vw, 54px);
  font-weight: 300;
  letter-spacing: 0.05em;
  line-height: 1.2;
  color: var(--lake-deep);
  margin: 12px 0 20px;
}

.page-about .about-hero__visual {
  width: 100%;
  border-radius: var(--radius-l) var(--radius-s) var(--radius-l) var(--radius-s);
  box-shadow: var(--shadow-soft);
}

.page-about .about-hero__body p {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--ink);
}

.page-about .about-hero__body .lead {
  font-size: clamp(16px, 2.4vw, 19px);
  line-height: 1.85;
  color: var(--lake-deep);
  font-weight: 400;
}

.page-about .about-stats {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 14px 16px;
  background: var(--paper);
  border-left: 3px solid var(--sunrise);
  border-radius: var(--radius-s);
}

.page-about .about-stat:nth-child(2) {
  border-left-color: var(--lake-mid);
}

.page-about .about-stat:nth-child(3) {
  border-left-color: var(--prayer-yellow);
}

.page-about .about-stat:nth-child(4) {
  border-left-color: var(--jewel-indigo);
}

.page-about .about-stat__num {
  font-family: var(--font-num);
  font-size: clamp(24px, 4.4vw, 32px);
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--lake-deep);
  line-height: 1.1;
}

.page-about .about-stat__label {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--slate);
}

/* ---------- 主体分栏 ---------- */
.page-about .about-shell {
  display: block;
}

.page-about .about-index {
  margin-bottom: clamp(22px, 4vw, 34px);
}

.page-about .about-index__title {
  display: none;
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 4px 0 10px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-index__list li {
  flex: 0 0 auto;
}

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

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  border-color: var(--sunrise);
  color: var(--sunrise);
}

.page-about .about-index__num {
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--sunrise);
}

/* ---------- 章节 ---------- */
.page-about .about-section {
  padding: clamp(26px, 4vw, 42px) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 0;
}

.page-about .about-flow > [id] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

.page-about .about-section__num {
  margin: 0;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.24em;
  color: var(--sunrise);
}

.page-about .about-section__title {
  margin: 8px 0 12px;
  font-size: clamp(22px, 3.6vw, 32px);
  font-weight: 500;
  line-height: 1.32;
  color: var(--lake-deep);
}

.page-about .about-section__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.9;
  color: var(--ink);
  max-width: 62ch;
}

/* ---------- 场景 ---------- */
.page-about .scene-grid {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .scene-grid li {
  position: relative;
  padding: 16px 18px 16px 42px;
  background: var(--paper);
  border-radius: var(--radius-m);
  font-size: 14px;
  line-height: 1.75;
  color: var(--slate);
}

.page-about .scene-grid li::before {
  content: "";
  position: absolute;
  left: 18px;
  top: 21px;
  width: 9px;
  height: 9px;
  border-radius: 3px;
  transform: rotate(45deg);
  background: var(--prayer-yellow);
}

.page-about .scene-grid li:nth-child(3n + 2)::before {
  background: var(--sunrise);
}

.page-about .scene-grid li:nth-child(3n)::before {
  background: var(--lake-mid);
}

.page-about .scene-grid strong {
  display: block;
  margin-bottom: 4px;
  font-size: 14.5px;
  font-weight: 600;
  color: var(--lake-deep);
}

/* ---------- 时间线 ---------- */
.page-about .journey__figure {
  margin: 20px 0 24px;
}

.page-about .journey__figure .media-caption {
  font-size: 12.5px;
  color: var(--slate);
  margin-top: 8px;
}

.page-about .journey {
  position: relative;
  padding-left: 0;
}

.page-about .journey::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--lake-mid) 0%, var(--lake-light) 58%, var(--prayer-yellow) 100%);
}

.page-about .stage {
  position: relative;
  padding-left: 44px;
}

.page-about .stage + .stage {
  margin-top: 16px;
}

.page-about .stage__dot {
  position: absolute;
  left: 8px;
  top: 12px;
  width: 16px;
  height: 16px;
  border-radius: 4px;
  transform: rotate(45deg);
  background: var(--sunrise);
  box-shadow: 0 0 0 4px var(--mist);
  z-index: 1;
}

.page-about .stage:nth-child(2) .stage__dot {
  background: var(--lake-mid);
}

.page-about .stage:nth-child(3) .stage__dot {
  background: var(--prayer-yellow);
}

.page-about .stage:nth-child(4) .stage__dot {
  background: var(--jewel-indigo);
}

.page-about .stage__card {
  background: linear-gradient(112deg, rgba(217, 237, 242, 0.85) 0 24%, var(--paper) 24.5%);
  border-radius: var(--radius-m);
  padding: 18px 18px 16px 22px;
  border-left: 3px solid var(--lake-mid);
}

.page-about .stage:nth-child(3) .stage__card {
  border-left-color: var(--prayer-yellow);
}

.page-about .stage:nth-child(4) .stage__card {
  border-left-color: var(--jewel-indigo);
}

.page-about .stage__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
}

.page-about .stage__num {
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--sunrise);
}

.page-about .stage__title {
  margin: 0;
  font-size: 17px;
  font-weight: 600;
  color: var(--lake-deep);
}

.page-about .stage__text {
  margin: 8px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--ink);
}

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

.page-about .stage__more summary {
  display: inline-flex;
  align-items: center;
  gap: 6px;
  cursor: pointer;
  list-style: none;
  padding: 7px 14px;
  border-radius: 999px;
  background: var(--lake-light);
  color: var(--lake-deep);
  font-size: 12.5px;
  letter-spacing: 0.02em;
}

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

.page-about .stage__more summary::after {
  content: "＋";
  font-weight: 700;
  color: var(--sunrise);
}

.page-about .stage__more[open] summary::after {
  content: "－";
}

.page-about .stage__points {
  margin: 12px 0 0;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .stage__points li + li {
  margin-top: 6px;
}

/* ---------- 团队 ---------- */
.page-about .team__figure {
  margin: 20px 0 20px;
}

.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .team-card {
  padding: 18px;
  background: var(--paper);
  border-radius: var(--radius-m);
  border-top: 3px solid var(--lake-mid);
}

.page-about .team-card:nth-child(2) {
  border-top-color: var(--sunrise);
}

.page-about .team-card:nth-child(3) {
  border-top-color: var(--prayer-yellow);
}

.page-about .team-card:nth-child(4) {
  border-top-color: var(--jewel-indigo);
}

.page-about .team-card__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--lake-deep);
}

.page-about .team-card__text {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .rhythm {
  margin-top: 18px;
  display: grid;
  gap: 10px;
}

.page-about .rhythm__row {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
  padding: 13px 15px;
  border-radius: var(--radius-s);
  background: var(--lake-light);
  font-size: 13.8px;
  line-height: 1.75;
  color: var(--ink);
}

.page-about .rhythm__key {
  font-family: var(--font-num);
  font-weight: 700;
  color: var(--lake-deep);
  letter-spacing: 0.02em;
}

/* ---------- 原则 ---------- */
.page-about .principle-list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .principle {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  padding: 20px;
  border-radius: var(--radius-m);
  background: var(--paper);
}

.page-about .principle--deep {
  background: linear-gradient(140deg, var(--lake-deep) 0%, var(--lake-mid) 100%);
}

.page-about .principle__num {
  font-family: var(--font-num);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--sunrise);
  flex: 0 0 auto;
}

.page-about .principle--deep .principle__num {
  color: var(--prayer-yellow);
}

.page-about .principle__title {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 600;
  color: var(--lake-deep);
}

.page-about .principle--deep .principle__title {
  color: var(--lake-light);
}

.page-about .principle__text {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.85;
  color: var(--ink);
}

.page-about .principle--deep .principle__text {
  color: rgba(217, 237, 242, 0.9);
}

/* ---------- 厂商目录 ---------- */
.page-about .partner {
  margin-top: 20px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .partner__item {
  padding: 16px 18px;
  background: var(--paper);
  border-left: 3px solid var(--prayer-yellow);
  border-radius: var(--radius-s);
}

.page-about .partner__item:nth-child(2) {
  border-left-color: var(--lake-mid);
}

.page-about .partner__item:nth-child(3) {
  border-left-color: var(--jewel-wine);
}

.page-about .partner__title {
  margin: 0 0 6px;
  font-size: 15px;
  font-weight: 600;
  color: var(--lake-deep);
}

.page-about .partner__text {
  margin: 0;
  font-size: 13.8px;
  line-height: 1.85;
  color: var(--slate);
}

.page-about .partner__text .num-anchor {
  font-family: var(--font-num);
  font-size: 16px;
  font-weight: 700;
  color: var(--sunrise);
}

.page-about .link-row {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(28px, 5vw, 48px);
  padding: clamp(24px, 4vw, 42px);
  border-radius: var(--radius-l);
  background: linear-gradient(135deg, var(--lake-deep) 0%, var(--lake-mid) 72%, var(--jewel-indigo) 100%);
  color: var(--lake-light);
}

.page-about .about-cta__title {
  margin: 0 0 10px;
  font-size: clamp(20px, 3.2vw, 27px);
  font-weight: 400;
  letter-spacing: 0.03em;
  color: var(--lake-light);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 56ch;
  font-size: 14px;
  line-height: 1.9;
  color: rgba(238, 244, 245, 0.86);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-cta__note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.8;
  color: rgba(238, 244, 245, 0.72);
}

.page-about .about-cta__note a {
  color: var(--prayer-yellow);
  text-decoration: none;
}

.page-about .about-cta__note a:hover,
.page-about .about-cta__note a:focus-visible {
  text-decoration: underline;
}

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

@media (min-width: 960px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 32fr) minmax(0, 68fr);
    align-items: start;
  }

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

  .page-about .about-shell {
    display: grid;
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--header-h) + 24px);
    margin-bottom: 0;
  }

  .page-about .about-index__title {
    display: block;
    margin: 0 0 14px;
    font-size: 11.5px;
    letter-spacing: 0.26em;
    color: var(--slate);
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 2px solid var(--about-line);
    border-radius: 0;
    background: transparent;
    padding: 9px 0 9px 14px;
    font-size: 13.5px;
    white-space: normal;
    line-height: 1.6;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--sunrise);
    color: var(--sunrise);
  }

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

  .page-about .rhythm__row {
    grid-template-columns: 76px minmax(0, 1fr);
  }
}

@media (min-width: 1120px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

  .page-about .stage:nth-child(even) {
    margin-left: 32px;
  }
}
<<<END>>>