.page-about {
  --about-hair: rgba(124, 135, 146, 0.28);
  --about-hair-strong: rgba(124, 135, 146, 0.55);
  --about-gap: clamp(1.5rem, 4vw, 3.5rem);
  background: var(--bg);
  color: var(--txt);
}

/* ---------- 面包屑 ---------- */
.about-crumbs {
  padding-top: 1.25rem;
  padding-bottom: 0.5rem;
}
.page-about .crumbs ul {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.35rem;
  margin: 0;
  padding: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--txt-dim);
}
.page-about .crumbs li + li::before {
  content: "/";
  margin-right: 0.45rem;
  color: var(--ink-400);
}
.page-about .crumbs a {
  color: var(--txt-dim);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease);
}
.page-about .crumbs a:hover,
.page-about .crumbs a:focus-visible {
  color: var(--blue-300);
  border-bottom-color: var(--blue-300);
}

/* ---------- 章节头 ---------- */
.page-about .sec-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: clamp(0.85rem, 3vw, 2rem);
  row-gap: 0.45rem;
  align-items: start;
  margin-bottom: clamp(1.5rem, 4vw, 2.75rem);
}
.page-about .sec-num {
  grid-column: 1;
  grid-row: 1 / span 2;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.05rem, 2vw, 1.5rem);
  line-height: 1.1;
  color: var(--blue-500);
  font-variant-numeric: tabular-nums;
  padding-top: 0.2em;
}
.page-about .sec-title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: clamp(1.45rem, 4.4vw, 2.35rem);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--txt);
}
.page-about .sec-kicker {
  grid-column: 2;
  grid-row: 2;
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--txt-dim);
}

/* 沙色分区内的文字映射 */
.page-about .section--sand {
  background: var(--sand-100);
  color: var(--on-sand);
}
.page-about .section--sand .sec-title {
  color: var(--on-sand);
}
.page-about .section--sand .sec-num {
  color: var(--blue-700);
}
.page-about .section--sand .sec-kicker {
  color: var(--on-sand-dim);
}
.page-about .section--sand .prose p {
  color: var(--on-sand-dim);
}

/* ---------- 首屏框景 ---------- */
.about-top {
  padding-top: 0.75rem;
}
.about-frame {
  border: 1px solid var(--about-hair-strong);
  background: linear-gradient(160deg, rgba(20, 86, 143, 0.22), rgba(27, 31, 36, 0) 62%);
}
.about-frame__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2rem;
  padding: clamp(1.35rem, 4.5vw, 3.25rem);
}
.about-top__lead h1 {
  margin: 0.6rem 0 0;
  font-size: clamp(1.85rem, 6.4vw, 3.6rem);
  line-height: 1.14;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--txt);
}
.about-top__intro {
  margin: 1.1rem 0 0;
  max-width: 46ch;
  font-size: clamp(0.95rem, 2.2vw, 1.06rem);
  line-height: 1.8;
  color: var(--txt-dim);
}
.about-top__panel {
  display: grid;
  gap: 1rem;
  align-content: start;
  padding-top: 0.35rem;
}
.page-about .about-top__panel .stat {
  border-left: 2px solid var(--blue-500);
  padding-left: 0.95rem;
}
.page-about .about-top__panel .stat__value {
  display: block;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.55rem, 5.4vw, 2.5rem);
  line-height: 1.05;
  color: var(--orange-500);
  font-variant-numeric: tabular-nums;
}
.page-about .about-top__panel .stat__label {
  display: block;
  margin-top: 0.3rem;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--txt-dim);
}
.about-top__media {
  margin: 0;
  border-top: 1px solid var(--about-hair);
}
.about-top__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1920 / 900;
  object-fit: cover;
  filter: saturate(0.92) contrast(1.04);
}

/* ---------- 01 起源 ---------- */
.about-origin__grid {
  display: grid;
  gap: var(--about-gap);
}
.about-origin__prose p {
  font-size: 1rem;
  line-height: 1.85;
  margin: 0 0 1em;
}
.about-origin__aside {
  display: grid;
  gap: 1rem;
  align-content: start;
}
.origin-point {
  border: 1px solid rgba(20, 86, 143, 0.28);
  border-left: 3px solid var(--blue-700);
  background: rgba(250, 251, 252, 0.72);
  padding: 1.1rem 1.2rem;
}
.origin-point--orange {
  border-color: rgba(180, 101, 58, 0.32);
  border-left-color: var(--clay-500);
}
.origin-point__name {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--on-sand-dim);
}
.origin-point__num {
  margin: 0.4rem 0 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  line-height: 1;
  color: var(--blue-700);
  font-variant-numeric: tabular-nums;
}
.origin-point--orange .origin-point__num {
  color: var(--clay-500);
}
.origin-point__num span {
  font-size: 0.42em;
  letter-spacing: 0.06em;
  margin-left: 0.35em;
  color: var(--on-sand-dim);
}
.origin-point__desc {
  margin: 0.65rem 0 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--on-sand-dim);
}

/* ---------- 02 时间线 ---------- */
.about-timeline {
  position: relative;
  overflow: hidden;
  background: var(--ink-900);
}
.about-timeline__bg {
  position: absolute;
  inset: 0;
  margin: 0;
  pointer-events: none;
  z-index: 0;
}
.about-timeline__bg img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.07;
}
.about-timeline__inner {
  position: relative;
  z-index: 1;
}
.about-tl {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
  border-left: 1px solid var(--about-hair);
  margin-left: 0.4rem;
}
.about-tl__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0.5rem;
  position: relative;
  padding: 0 0 1.9rem 1.5rem;
}
.about-tl__item::before {
  content: "";
  position: absolute;
  left: -5.5px;
  top: 0.62rem;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--clay-500);
  box-shadow: 0 0 0 4px rgba(180, 101, 58, 0.18);
}
.about-tl__item--last {
  padding-bottom: 0;
}
.about-tl__item--last::before {
  background: var(--green-500);
  box-shadow: 0 0 0 4px rgba(46, 158, 99, 0.2);
}
.about-tl__num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 0.82rem;
  letter-spacing: 0.08em;
  color: var(--orange-500);
  font-variant-numeric: tabular-nums;
}
.about-tl__title {
  margin: 0.28rem 0 0;
  font-size: clamp(1.05rem, 3.4vw, 1.35rem);
  line-height: 1.35;
  color: var(--txt);
}
.about-tl__text {
  margin: 0.5rem 0 0;
  max-width: 62ch;
  font-size: 0.94rem;
  line-height: 1.78;
  color: var(--txt-dim);
}

/* ---------- 03 团队 ---------- */
.about-team__lede {
  margin: -0.5rem 0 clamp(1.4rem, 3.5vw, 2rem);
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--on-sand-dim);
}
.about-team__grid {
  display: grid;
  gap: 1rem;
}
.page-about .about-card {
  position: relative;
  display: flex;
  align-items: stretch;
  background: rgba(250, 251, 252, 0.78);
  border: 1px solid rgba(27, 31, 36, 0.14);
  border-radius: var(--radius);
  overflow: hidden;
  transition: border-color 0.3s var(--ease), transform 0.3s var(--ease);
}
.page-about .about-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  border-top: 2px solid var(--blue-500);
  border-left: 2px solid var(--blue-500);
  pointer-events: none;
}
.page-about .about-card:hover {
  border-color: rgba(240, 120, 24, 0.55);
  transform: translateY(-3px);
}
.about-card__body {
  flex: 1 1 auto;
  min-width: 0;
  padding: 1.35rem 1.3rem;
}
.about-card__title {
  margin: 0;
  font-size: clamp(1.1rem, 3.6vw, 1.3rem);
  color: var(--on-sand);
}
.about-card__text {
  margin: 0.6rem 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--on-sand-dim);
}
.about-card__tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin: 0.95rem 0 0;
  padding: 0;
}
.about-card__tags li {
  font-size: 11.5px;
  letter-spacing: 0.06em;
  padding: 0.24rem 0.58rem;
  border: 1px solid rgba(30, 127, 196, 0.35);
  color: var(--blue-700);
  background: rgba(30, 127, 196, 0.07);
}
.about-card__count {
  flex: 0 0 auto;
  display: flex;
  align-items: center;
  justify-content: center;
  writing-mode: vertical-rl;
  text-orientation: upright;
  letter-spacing: 0.2em;
  font-size: 12px;
  padding: 0.9rem 0.55rem;
  color: var(--clay-500);
  background: rgba(180, 101, 58, 0.09);
  border-left: 1px solid rgba(27, 31, 36, 0.12);
  transition: background 0.3s var(--ease), color 0.3s var(--ease);
}
.about-card__count i {
  font-family: var(--font-mono);
  font-style: normal;
  font-weight: 600;
  font-size: 15px;
  letter-spacing: 0.02em;
  color: var(--on-sand);
  font-variant-numeric: tabular-nums;
}
.page-about .about-card:hover .about-card__count {
  background: rgba(240, 120, 24, 0.2);
}

/* ---------- 04 数据来源 ---------- */
.about-data__grid {
  display: grid;
  gap: var(--about-gap);
}
.about-data__prose p {
  font-size: 1rem;
  line-height: 1.85;
  margin: 0 0 1em;
  color: var(--txt-dim);
}
.about-flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  align-content: start;
}
.about-flow__step {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 0.9rem;
  row-gap: 0.18rem;
  padding: 0.85rem 1.4rem 0.85rem 1rem;
  background: linear-gradient(90deg, rgba(30, 127, 196, 0.18), rgba(30, 127, 196, 0.02));
  border: 1px solid var(--about-hair);
  border-left: 3px solid var(--blue-500);
  clip-path: polygon(0 0, calc(100% - 14px) 0, 100% 50%, calc(100% - 14px) 100%, 0 100%);
  transition: border-left-color 0.3s var(--ease), background 0.3s var(--ease);
}
.about-flow__step:hover {
  border-left-color: var(--orange-500);
  background: linear-gradient(90deg, rgba(240, 120, 24, 0.16), rgba(240, 120, 24, 0.02));
}
.about-flow__num {
  grid-column: 1;
  grid-row: 1;
  align-self: center;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--blue-300);
  font-variant-numeric: tabular-nums;
}
.about-flow__name {
  grid-column: 2;
  grid-row: 1;
  font-weight: 700;
  font-size: 0.98rem;
  color: var(--txt);
}
.about-flow__desc {
  grid-column: 2;
  grid-row: 2;
  font-size: 0.83rem;
  line-height: 1.6;
  color: var(--txt-dim);
}
.about-depth {
  margin-top: clamp(1.6rem, 4vw, 2.6rem);
  display: grid;
  gap: 1rem;
  border-top: 1px solid var(--about-hair);
  padding-top: clamp(1.4rem, 3.5vw, 2.2rem);
}
.about-depth__item {
  border: 1px solid var(--about-hair);
  border-top: 2px solid var(--moss-600);
  padding: 1.1rem 1.2rem;
  background: rgba(51, 58, 66, 0.34);
}
.about-depth__item--deep {
  border-top-color: var(--orange-500);
}
.about-depth__label {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--txt-dim);
}
.about-depth__n {
  margin: 0.35rem 0 0;
  font-size: 0.9rem;
  letter-spacing: 0.06em;
  color: var(--txt-dim);
}
.about-depth__n span {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.7rem, 5vw, 2.3rem);
  line-height: 1;
  margin-right: 0.3rem;
  color: var(--txt);
  font-variant-numeric: tabular-nums;
}
.about-depth__item--deep .about-depth__n span {
  color: var(--orange-500);
}
.about-depth__desc {
  margin: 0.7rem 0 0;
  font-size: 0.88rem;
  line-height: 1.72;
  color: var(--txt-dim);
}
.about-depth__media {
  margin: 0;
  border: 1px solid var(--about-hair);
}
.about-depth__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 1200 / 800;
  object-fit: cover;
}
.about-depth__media .media__caption {
  display: block;
  padding: 0.6rem 0.85rem;
  font-size: 12px;
  letter-spacing: 0.05em;
  color: var(--txt-dim);
  border-top: 1px solid var(--about-hair);
}

/* ---------- 05 合作与认可 ---------- */
.about-partner__lede {
  margin: -0.5rem 0 clamp(1.3rem, 3.5vw, 2rem);
  max-width: 68ch;
  font-size: 1rem;
  line-height: 1.82;
  color: var(--on-sand-dim);
}
.about-partner__grid {
  display: grid;
  gap: 1rem;
}
.about-partner__card {
  position: relative;
  border: 1px solid rgba(27, 31, 36, 0.16);
  background: rgba(250, 251, 252, 0.6);
  padding: 1.2rem 1.25rem 1.3rem;
  transition: border-color 0.3s var(--ease);
}
.about-partner__card::after {
  content: "";
  position: absolute;
  right: 0;
  bottom: 0;
  width: 26px;
  height: 26px;
  background: linear-gradient(135deg, transparent 49%, rgba(95, 124, 78, 0.5) 50%, transparent 55%);
}
.about-partner__card:hover {
  border-color: rgba(95, 124, 78, 0.6);
}
.about-partner__kind {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--moss-600);
}
.about-partner__text {
  margin: 0.6rem 0 0;
  font-size: 0.92rem;
  line-height: 1.75;
  color: var(--on-sand-dim);
}
.about-honor {
  margin-top: clamp(1.4rem, 3.5vw, 2.2rem);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.85rem;
  padding: 1rem 1.2rem;
  background: rgba(250, 251, 252, 0.72);
  border: 1px solid rgba(180, 101, 58, 0.35);
}
.about-honor__badge {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.06em;
  padding: 0.3rem 0.7rem;
  color: var(--white-050);
  background: var(--clay-500);
}
.about-honor__text {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.6;
  color: var(--on-sand);
}

/* ---------- 06 安全 ---------- */
.about-safe__grid {
  display: grid;
  gap: 1rem;
}
.about-safe__item {
  border-top: 1px solid var(--about-hair-strong);
  padding-top: 1rem;
}
.about-safe__n {
  margin: 0;
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--green-500);
  font-variant-numeric: tabular-nums;
}
.about-safe__title {
  margin: 0.45rem 0 0;
  font-size: clamp(1.05rem, 3.4vw, 1.22rem);
  color: var(--txt);
}
.about-safe__text {
  margin: 0.55rem 0 0;
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--txt-dim);
}

/* ---------- 结尾索引 ---------- */
.about-next {
  background: var(--ink-900);
  border-top: 1px solid var(--about-hair-strong);
}
.about-next__title {
  margin: 0 0 1.1rem;
  font-size: clamp(1.25rem, 3.8vw, 1.7rem);
  color: var(--txt);
}
.page-about .about-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: next;
}
.page-about .about-next__list li {
  counter-increment: next;
  border-bottom: 1px solid var(--about-hair);
}
.page-about .about-next__list a {
  display: flex;
  align-items: baseline;
  gap: 0.85rem;
  padding: 0.9rem 0.2rem;
  text-decoration: none;
  color: var(--txt-dim);
  font-size: 0.95rem;
  transition: color 0.25s var(--ease), padding-left 0.25s var(--ease);
}
.page-about .about-next__list a::before {
  content: counter(next, decimal-leading-zero);
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--blue-500);
  flex: 0 0 auto;
}
.page-about .about-next__list a:hover,
.page-about .about-next__list a:focus-visible {
  color: var(--orange-500);
  padding-left: 0.55rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .about-origin__aside {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .about-partner__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .about-safe__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .about-depth {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .about-frame__inner {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    gap: clamp(2rem, 5vw, 4.5rem);
    align-items: center;
  }
  .about-top__panel {
    gap: 1.6rem;
  }
  .about-origin__grid {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  }
  .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .about-partner__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .about-safe__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .about-data__grid {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }
  .about-depth {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr) minmax(0, 1.1fr);
    align-items: stretch;
  }
  .about-tl__item {
    grid-template-columns: 9rem minmax(0, 1fr);
    column-gap: 1.6rem;
    padding-left: 2rem;
  }
  .about-tl__num {
    grid-column: 1;
    padding-top: 0.28rem;
  }
  .about-tl__body {
    grid-column: 2;
  }
  .about-tl__title {
    margin-top: 0;
  }
}

@media (min-width: 1200px) {
  .about-tl__item {
    grid-template-columns: 11rem minmax(0, 1fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-flow__step,
  .page-about .about-next__list a {
    transition: none;
  }
}
<<<END>>>