.page-about {
  background-color: var(--deep);
  color: var(--white);
  font-family: var(--font-body);
}

.page-about .mono {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
}

/* 面包屑 */
.page-about .about-crumbs {
  padding-top: 1rem;
}

.page-about .about-crumbs .crumbs {
  color: var(--cyan-soft);
  opacity: 0.78;
  font-size: 12px;
  letter-spacing: 0.1em;
}

.page-about .about-crumbs .crumbs a {
  color: inherit;
  text-decoration: none;
}

.page-about .about-crumbs .crumbs a:hover {
  color: var(--cyan);
  opacity: 1;
}

/* 索引标签统一色调 */
.page-about .index-tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
  margin: 0;
}

/* 首屏 */
.page-about .about-hero {
  padding: 2rem 0 3rem;
  background-image:
    radial-gradient(130% 100% at 88% 0%, rgba(38, 240, 208, 0.15), transparent 62%),
    linear-gradient(180deg, var(--deep) 0%, var(--panel) 100%);
}

.page-about .about-hero__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-hero__title {
  font-family: var(--font-body);
  font-weight: 300;
  font-size: clamp(2rem, 9.5vw, 4.4rem);
  line-height: 1.06;
  letter-spacing: 0.01em;
  margin: 0.7rem 0 1.2rem;
  color: var(--white);
  overflow-wrap: break-word;
}

.page-about .about-hero__lede {
  color: var(--cyan-soft);
  font-size: 1rem;
  line-height: 1.8;
  max-width: 34em;
  margin: 0 0 0.9rem;
}

.page-about .about-hero__note {
  color: rgba(251, 250, 247, 0.62);
  font-size: 0.9rem;
  line-height: 1.75;
  margin: 0;
  max-width: 32em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--panel);
}

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

.page-about .about-hero__figure .figure__cap {
  padding: 0.7rem 0.9rem;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan-soft);
  border-top: 1px solid var(--line-dark);
}

/* 章节索引条 */
.page-about .about-index {
  position: sticky;
  top: var(--statusbar-h);
  z-index: 20;
  background-color: rgba(11, 31, 26, 0.86);
  backdrop-filter: blur(14px);
  -webkit-backdrop-filter: blur(14px);
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-index__inner {
  display: flex;
  gap: 1.4rem;
  overflow-x: auto;
  padding: 0.75rem 0;
  scrollbar-width: none;
}

.page-about .about-index__inner::-webkit-scrollbar {
  display: none;
}

.page-about .about-index__inner a {
  flex: 0 0 auto;
  color: var(--cyan-soft);
  text-decoration: none;
  font-size: 13px;
  letter-spacing: 0.06em;
}

.page-about .about-index__inner a:hover {
  color: var(--cyan);
}

/* 规模数字横条 */
.page-about .about-stats {
  background-color: var(--panel);
  border-bottom: 1px solid var(--line-dark);
  padding: 2rem 0;
}

.page-about .about-stats__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1.4rem;
}

.page-about .about-stats__item {
  display: grid;
  gap: 0.45rem;
}

.page-about .about-stats__key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan-soft);
}

.page-about .about-stats__num {
  font-size: 2rem;
  line-height: 1;
  color: var(--white);
  transition: color 180ms var(--ease);
}

.page-about .about-stats__bar {
  display: block;
  height: 3px;
  width: 42%;
  background-image: linear-gradient(90deg, var(--cyan), rgba(38, 240, 208, 0));
  transition: width 240ms var(--ease);
}

.page-about .about-stats__item:nth-child(2) .about-stats__bar {
  width: 30%;
}

.page-about .about-stats__item:nth-child(3) .about-stats__bar {
  width: 68%;
}

.page-about .about-stats__item:nth-child(4) .about-stats__bar {
  width: 88%;
}

.page-about .about-stats__item:hover .about-stats__num {
  color: var(--cyan);
}

.page-about .about-stats__item:hover .about-stats__bar {
  width: 100%;
}

/* 通用标题 */
.page-about .about-h2 {
  font-weight: 700;
  letter-spacing: -0.02em;
  font-size: clamp(1.5rem, 5.6vw, 2.2rem);
  line-height: 1.2;
  margin: 0.6rem 0 0.75rem;
  color: var(--white);
}

.page-about .about-sub {
  font-size: 0.95rem;
  line-height: 1.8;
  color: rgba(251, 250, 247, 0.66);
  margin: 0;
  max-width: 40em;
}

/* 发展脉络 */
.page-about .about-timeline {
  background-color: var(--paper);
  color: var(--text-dark);
  padding: 3rem 0 3.25rem;
}

.page-about .about-timeline .index-tag {
  color: var(--panel);
}

.page-about .about-timeline .about-h2 {
  color: var(--text-dark);
}

.page-about .about-timeline .about-sub {
  color: var(--muted);
}

.page-about .about-tl {
  margin-top: 1.6rem;
  padding-left: 1.1rem;
  border-left: 1px solid var(--line-light);
}

.page-about .about-tl__item {
  position: relative;
  border-top: 1px solid var(--rule);
}

.page-about .about-tl__item:last-child {
  border-bottom: 1px solid var(--rule);
}

.page-about .about-tl__heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .about-tl__trigger {
  display: grid;
  grid-template-columns: 2.4rem 1fr 1.3rem;
  grid-template-areas:
    "num label icon"
    "name name name";
  align-items: center;
  gap: 0.3rem 0.8rem;
  width: 100%;
  padding: 1.05rem 0;
  background: none;
  border: 0;
  text-align: left;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

.page-about .about-tl__num {
  grid-area: num;
  font-size: 12px;
  color: var(--muted);
  letter-spacing: 0.08em;
  transition: color 180ms var(--ease);
}

.page-about .about-tl__label {
  grid-area: label;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-tl__name {
  grid-area: name;
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-dark);
  line-height: 1.45;
  margin-top: 0.15rem;
}

.page-about .about-tl__icon {
  grid-area: icon;
  position: relative;
  display: inline-block;
  width: 13px;
  height: 13px;
  justify-self: end;
  color: var(--muted);
}

.page-about .about-tl__icon::before,
.page-about .about-tl__icon::after {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 13px;
  height: 1.5px;
  background-color: currentColor;
  transform: translateY(-50%);
  transition: transform 180ms var(--ease);
}

.page-about .about-tl__icon::after {
  transform: translateY(-50%) rotate(90deg);
}

.page-about .about-tl__item[data-open] .about-tl__icon::after {
  transform: translateY(-50%) rotate(0deg);
}

.page-about .about-tl__item[data-open] .about-tl__num {
  color: var(--text-dark);
}

.page-about .about-tl__item[data-open] .about-tl__name {
  box-shadow: inset 0 -0.55em 0 rgba(38, 240, 208, 0.28);
}

.page-about .about-tl__panel {
  padding: 0 0 1.35rem;
  max-width: 44rem;
}

.page-about .about-tl__panel p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-dark);
}

/* 内容能力 */
.page-about .about-scale {
  position: relative;
  padding: 3rem 0;
  background-color: var(--deep);
  background-image: repeating-radial-gradient(
    circle at 15% 130%,
    transparent 0 30px,
    rgba(155, 247, 230, 0.055) 30px 31px
  );
}

.page-about .about-scale__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-scale__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0;
}

.page-about .about-scale__row {
  display: grid;
  grid-template-columns: 4.5rem 1fr;
  align-items: baseline;
  gap: 0.9rem;
  padding: 0.95rem 0;
  border-bottom: 1px solid var(--line-dark);
}

.page-about .about-scale__row:first-child {
  border-top: 1px solid var(--line-dark);
}

.page-about .about-scale__num {
  font-size: 1.5rem;
  line-height: 1;
  color: var(--cyan);
}

.page-about .about-scale__label {
  font-size: 0.92rem;
  line-height: 1.7;
  color: rgba(251, 250, 247, 0.82);
}

/* 团队 */
.page-about .about-team {
  background-color: var(--paper);
  color: var(--text-dark);
  padding: 3rem 0;
}

.page-about .about-team .index-tag {
  color: var(--panel);
}

.page-about .about-team .about-h2 {
  color: var(--text-dark);
}

.page-about .about-team .about-sub {
  color: var(--muted);
}

.page-about .about-team__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-team__bar {
  display: flex;
  height: 14px;
  margin: 1.6rem 0 1rem;
  border-radius: var(--radius);
  overflow: hidden;
  background-color: rgba(26, 31, 29, 0.08);
}

.page-about .about-team__seg {
  display: block;
  height: 100%;
}

.page-about .about-team__seg--edit {
  width: 38%;
  background-color: var(--panel);
}

.page-about .about-team__seg--tech {
  width: 44%;
  background-color: var(--cyan);
}

.page-about .about-team__seg--ops {
  width: 18%;
  background-color: var(--gold);
}

.page-about .about-team__legend {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .about-team__role {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  grid-template-areas:
    "swatch name num"
    "swatch desc desc";
  align-items: center;
  gap: 0.15rem 0.7rem;
}

.page-about .about-team__swatch {
  grid-area: swatch;
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
}

.page-about .about-team__swatch--edit {
  background-color: var(--panel);
}

.page-about .about-team__swatch--tech {
  background-color: var(--cyan);
}

.page-about .about-team__swatch--ops {
  background-color: var(--gold);
}

.page-about .about-team__role-name {
  grid-area: name;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--text-dark);
}

.page-about .about-team__role-num {
  grid-area: num;
  font-size: 0.9rem;
  color: var(--text-dark);
}

.page-about .about-team__role-desc {
  grid-area: desc;
  font-size: 0.85rem;
  color: var(--muted);
  line-height: 1.6;
}

.page-about .about-team__figure {
  margin: 0;
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--white);
}

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

.page-about .about-team__figure .figure__cap {
  padding: 0.7rem 0.9rem;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--muted);
  border-top: 1px solid var(--line-light);
}

/* 服务范围 */
.page-about .about-region {
  padding: 3rem 0;
  background-color: var(--deep);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-region__grid {
  display: grid;
  gap: 2rem;
}

.page-about .about-region__figure {
  margin: 0;
  border: 1px solid var(--line-dark);
  border-radius: var(--radius);
  overflow: hidden;
  background-color: var(--panel);
}

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

.page-about .about-region__figure .figure__cap {
  padding: 0.7rem 0.9rem;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--cyan-soft);
  border-top: 1px solid var(--line-dark);
}

.page-about .about-region__facts {
  display: grid;
  gap: 1.1rem;
  margin: 1.5rem 0 1.2rem;
}

.page-about .about-region__fact {
  display: grid;
  gap: 0.3rem;
  padding-left: 0.9rem;
  border-left: 2px solid var(--cyan);
}

.page-about .about-region__fact-num {
  font-size: 1.6rem;
  line-height: 1;
  color: var(--white);
}

.page-about .about-region__fact-key {
  font-size: 0.85rem;
  color: rgba(251, 250, 247, 0.68);
  line-height: 1.6;
}

.page-about .about-region__note {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: rgba(251, 250, 247, 0.7);
  border-top: 1px solid var(--line-dark);
  padding-top: 1rem;
}

/* 服务原则 */
.page-about .about-principles {
  background-color: var(--paper);
  color: var(--text-dark);
  padding: 3rem 0 3.25rem;
}

.page-about .about-principles .index-tag {
  color: var(--panel);
}

.page-about .about-principles .about-h2 {
  color: var(--text-dark);
  margin-bottom: 1.5rem;
}

.page-about .about-principles__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-principles__item {
  background-color: var(--white);
  border: 1px solid var(--line-light);
  border-radius: var(--radius);
  padding: 1.3rem 1.15rem 1.4rem;
  display: grid;
  gap: 0.55rem;
}

.page-about .about-principles__no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-principles__title {
  margin: 0;
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--text-dark);
}

.page-about .about-principles__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-dark);
  opacity: 0.82;
}

/* 收束 */
.page-about .about-cta {
  padding: 2.75rem 0 3.25rem;
  background-image: linear-gradient(120deg, var(--panel) 0%, var(--deep) 62%);
  border-top: 1px solid var(--line-dark-strong);
}

.page-about .about-cta__inner {
  display: grid;
  gap: 1.5rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

/* 桌面 */
@media (min-width: 860px) {
  .page-about .about-hero {
    padding: 3rem 0 4rem;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-index__inner {
    gap: 2rem;
    justify-content: flex-start;
  }

  .page-about .about-stats {
    padding: 2.5rem 0;
  }

  .page-about .about-stats__list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 2rem;
  }

  .page-about .about-timeline,
  .page-about .about-team,
  .page-about .about-principles {
    padding: 4rem 0;
  }

  .page-about .about-scale,
  .page-about .about-region {
    padding: 4rem 0;
  }

  .page-about .about-tl {
    padding-left: 1.75rem;
    margin-top: 2rem;
  }

  .page-about .about-tl__trigger {
    grid-template-columns: 3rem 9.5rem 1fr 1.4rem;
    grid-template-areas: "num label name icon";
    gap: 0.8rem;
    padding: 1.2rem 0;
  }

  .page-about .about-tl__name {
    margin-top: 0;
    font-size: 1.1rem;
  }

  .page-about .about-scale__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: 3.25rem;
    align-items: start;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 3.25rem;
    align-items: center;
  }

  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.05fr);
    gap: 3.25rem;
    align-items: center;
  }

  .page-about .about-region__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 1.5rem;
  }

  .page-about .about-principles__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.25rem;
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: end;
    gap: 2.5rem;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__grid {
    gap: 4rem;
  }

  .page-about .about-scale__grid,
  .page-about .about-team__grid,
  .page-about .about-region__grid {
    gap: 4rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stats__num,
  .page-about .about-stats__bar,
  .page-about .about-tl__num,
  .page-about .about-tl__icon::before,
  .page-about .about-tl__icon::after {
    transition: none;
  }
}
<<<END>>>