.page-about {
  background: var(--ink);
  color: var(--white);
}

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

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(22px, 5vw, 44px) 0 clamp(30px, 5vw, 56px);
  background: linear-gradient(180deg, var(--night), var(--ink) 76%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(to right, rgba(230, 237, 234, 0.06) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(230, 237, 234, 0.06) 1px, transparent 1px);
  background-size: 64px 64px;
  opacity: 0.55;
  pointer-events: none;
}

.page-about .about-hero__shard {
  position: absolute;
  top: -20%;
  right: -16%;
  width: min(560px, 70%);
  height: 136%;
  background: linear-gradient(165deg, rgba(53, 240, 200, 0.2), rgba(20, 169, 155, 0.05) 54%, rgba(20, 169, 155, 0) 78%);
  transform: skewX(-10deg);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 12px;
  letter-spacing: 0.08em;
}

.page-about .breadcrumbs__link,
.page-about .breadcrumbs__item span {
  color: var(--mute);
  text-decoration: none;
}

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

.page-about .breadcrumbs__sep {
  color: rgba(147, 163, 157, 0.6);
}

.page-about .about-hero__kicker {
  margin: clamp(20px, 4vw, 34px) 0 0;
  color: var(--cyan);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  padding-left: 34px;
  position: relative;
}

.page-about .about-hero__kicker::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 24px;
  height: 1px;
  background: var(--cyan);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  max-width: 20ch;
  font-size: clamp(30px, 5.4vw, 58px);
  line-height: 1.1;
  letter-spacing: 0.015em;
  font-weight: 900;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: clamp(15px, 1.7vw, 17px);
  line-height: 1.85;
  color: rgba(248, 251, 249, 0.8);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 数据条 ---------- */
.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(28px, 5vw, 48px);
  background: rgba(230, 237, 234, 0.14);
  border: 1px solid rgba(230, 237, 234, 0.14);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-figures__cell {
  background: rgba(10, 42, 35, 0.9);
  padding: 14px 16px;
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-figures__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1.15;
  color: var(--cyan);
}

.page-about .about-figures__label {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--mute);
}

/* ---------- 索引 + 主体 ---------- */
.page-about .about-map {
  padding-top: clamp(24px, 4vw, 40px);
  padding-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-rail {
  margin-bottom: clamp(18px, 4vw, 30px);
}

.page-about .about-rail__title {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--mute);
}

.page-about .about-rail__list {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  list-style: none;
  margin: 10px 0 0;
  padding: 0 0 8px;
  scrollbar-width: thin;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 8px 12px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  color: rgba(248, 251, 249, 0.76);
  text-decoration: none;
  white-space: nowrap;
  font-size: 13px;
  transition: border-color var(--dur) var(--ease), color var(--dur) var(--ease), background var(--dur) var(--ease);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  border-color: rgba(53, 240, 200, 0.65);
  color: var(--white);
  background: rgba(53, 240, 200, 0.08);
}

.page-about .about-rail__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--cyan);
}

.page-about .about-main {
  min-width: 0;
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  padding: clamp(28px, 5vw, 48px) 0;
  border-top: 1px solid var(--line);
}

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

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

.page-about .about-chapter__num {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--cyan);
  border: 1px solid rgba(53, 240, 200, 0.42);
  border-radius: 2px;
  padding: 2px 6px;
}

.page-about .about-chapter__title {
  margin: 0;
  font-size: clamp(21px, 3.1vw, 32px);
  line-height: 1.28;
  letter-spacing: 0.01em;
  font-weight: 900;
}

.page-about .about-chapter__intro {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.85;
  color: rgba(248, 251, 249, 0.78);
}

.page-about .about-text {
  margin-top: 16px;
  max-width: 66ch;
}

.page-about .about-text--tight {
  margin-top: 20px;
}

.page-about .about-text p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(248, 251, 249, 0.74);
}

.page-about .about-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-text a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 240, 200, 0.4);
}

.page-about .about-text a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__media {
  position: relative;
  margin: clamp(20px, 4vw, 32px) 0 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-3);
}

.page-about .about-timeline__media img {
  display: block;
  width: 100%;
  height: clamp(150px, 26vw, 260px);
  object-fit: cover;
  filter: saturate(0.85) brightness(0.78);
}

.page-about .about-timeline__caption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--mute);
  border-top: 1px solid var(--line);
}

.page-about .about-timeline {
  position: relative;
  margin-top: clamp(22px, 4vw, 36px);
  padding-left: 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 14px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), rgba(53, 240, 200, 0.1));
}

.page-about .tl__item {
  position: relative;
  padding-bottom: 6px;
}

.page-about .tl__node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2px;
  width: 100%;
  padding: 10px 8px 10px 0;
  background: transparent;
  border: 0;
  border-radius: var(--radius);
  color: inherit;
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .tl__node::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 16px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid rgba(53, 240, 200, 0.55);
  transition: background var(--dur) var(--ease), box-shadow var(--dur) var(--ease);
}

.page-about .tl__node[aria-expanded="true"]::before {
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 240, 200, 0.16);
}

.page-about .tl__node:hover .tl__title {
  color: var(--cyan);
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .tl__title {
  font-size: 15px;
  font-weight: 700;
  color: var(--white);
  transition: color var(--dur) var(--ease);
}

.page-about .tl__panel {
  padding: 0 0 14px;
}

.page-about .tl__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(248, 251, 249, 0.72);
}

/* ---------- 数据流程 ---------- */
.page-about .about-audit {
  display: grid;
  gap: clamp(20px, 4vw, 36px);
  margin-top: clamp(20px, 4vw, 32px);
}

.page-about .about-steps {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-steps__item {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding: 16px 18px;
  background: var(--ink-2);
}

.page-about .about-steps__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 13px;
  color: var(--cyan);
  letter-spacing: 0.06em;
  padding-top: 2px;
}

.page-about .about-steps__body strong {
  display: block;
  font-size: 15px;
  color: var(--white);
  margin-bottom: 6px;
}

.page-about .about-steps__body p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(248, 251, 249, 0.72);
}

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-3);
}

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

.page-about .about-figure__cap {
  padding: 10px 14px;
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: 0.04em;
  color: var(--mute);
  border-top: 1px solid var(--line);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  margin-top: clamp(20px, 4vw, 30px);
  display: grid;
  gap: 16px;
  max-width: 720px;
}

.page-about .about-team__row {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  gap: 6px 12px;
  align-items: baseline;
}

.page-about .about-team__label {
  font-size: 14px;
  line-height: 1.6;
  color: rgba(248, 251, 249, 0.82);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-team__bar {
  grid-column: 1 / -1;
  display: block;
  height: 6px;
  border-radius: 3px;
  background: rgba(230, 237, 234, 0.12);
  overflow: hidden;
}

.page-about .about-team__fill {
  display: block;
  height: 100%;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--teal), var(--cyan));
}

/* ---------- 案例（冷灰板块） ---------- */
.page-about .about-slab {
  margin: clamp(20px, 4vw, 32px) 0;
  padding: clamp(20px, 4vw, 38px);
  background: var(--ice);
  color: var(--ink);
  border-radius: var(--radius);
}

.page-about .about-slab .about-chapter__num {
  color: var(--teal);
  border-color: rgba(20, 169, 155, 0.5);
}

.page-about .about-slab .about-chapter__title {
  color: var(--ink);
}

.page-about .about-slab .about-chapter__intro {
  color: rgba(10, 42, 35, 0.78);
}

.page-about .about-slab .about-text p {
  color: rgba(10, 42, 35, 0.78);
}

.page-about .about-slab .about-text a {
  color: var(--ink-3);
  border-bottom-color: rgba(20, 169, 155, 0.6);
}

.page-about .about-slab .about-text a:hover {
  border-bottom-color: var(--teal);
}

.page-about .about-slab .about-figure {
  margin-top: clamp(18px, 3vw, 28px);
  border-color: rgba(10, 42, 35, 0.16);
  background: var(--ink-2);
}

.page-about .about-slab .about-figure__cap {
  color: rgba(10, 42, 35, 0.66);
  border-top-color: rgba(10, 42, 35, 0.14);
}

.page-about .about-cases {
  margin-top: clamp(20px, 4vw, 30px);
  display: grid;
  gap: clamp(18px, 3vw, 26px);
}

.page-about .about-cases__tag {
  display: inline-block;
  margin: 0 0 6px;
  padding: 3px 9px;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink-3);
  border: 1px solid rgba(20, 169, 155, 0.45);
  border-radius: 2px;
  background: rgba(20, 169, 155, 0.08);
}

.page-about .about-slab .accordion {
  border-top: 1px solid rgba(10, 42, 35, 0.14);
}

.page-about .about-slab .accordion__item {
  border-bottom: 1px solid rgba(10, 42, 35, 0.14);
}

.page-about .about-slab .accordion__trigger {
  position: relative;
  width: 100%;
  padding: 14px 32px 14px 0;
  background: transparent;
  border: 0;
  color: var(--ink);
  font: inherit;
  font-size: 15px;
  font-weight: 700;
  text-align: left;
  cursor: pointer;
}

.page-about .about-slab .accordion__trigger::after {
  content: "+";
  position: absolute;
  right: 6px;
  top: 13px;
  font-family: var(--font-mono);
  font-size: 16px;
  color: var(--teal);
}

.page-about .about-slab .accordion__trigger[aria-expanded="true"]::after {
  content: "–";
}

.page-about .about-slab .accordion__panel {
  padding: 0 0 16px;
}

.page-about .about-slab .accordion__panel p {
  margin: 0;
  max-width: 62ch;
  font-size: 14px;
  line-height: 1.85;
  color: rgba(10, 42, 35, 0.76);
}

/* ---------- 服务网络 ---------- */
.page-about .about-reach {
  display: grid;
  gap: clamp(14px, 3vw, 22px);
  margin-top: clamp(20px, 4vw, 30px);
}

.page-about .about-reach__card {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(18, 58, 48, 0.6);
}

.page-about .about-reach__h {
  margin: 0 0 12px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--mute);
  font-weight: 700;
}

.page-about .about-reach__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
  border-top: 1px solid rgba(230, 237, 234, 0.1);
}

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

.page-about .about-reach__key {
  font-size: 14px;
  color: rgba(248, 251, 249, 0.74);
}

.page-about .about-reach__val {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 15px;
  color: var(--cyan);
  white-space: nowrap;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin: clamp(24px, 4vw, 40px) 0 clamp(32px, 6vw, 60px);
  padding: clamp(22px, 4vw, 38px);
  border: 1px solid rgba(53, 240, 200, 0.32);
  border-radius: var(--radius);
  background: linear-gradient(120deg, rgba(53, 240, 200, 0.13), rgba(20, 169, 155, 0.03) 62%);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(20px, 2.8vw, 28px);
  line-height: 1.3;
  font-weight: 900;
  color: var(--white);
}

.page-about .about-cta__intro {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(248, 251, 249, 0.78);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 22px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-figures {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 860px) {
  .page-about .about-figures {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-audit {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.8fr);
    align-items: start;
  }

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

@media (min-width: 1000px) {
  .page-about .about-map {
    display: grid;
    grid-template-columns: 148px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    align-items: start;
    padding-top: clamp(32px, 4vw, 52px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 118px;
    margin-bottom: 0;
    padding-left: 16px;
    border-left: 1px solid var(--line-strong);
  }

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

  .page-about .about-rail__link {
    border: 0;
    border-radius: 0;
    padding: 9px 0;
    background: transparent;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: transparent;
    padding-left: 6px;
  }

  .page-about .about-chapter {
    padding: clamp(34px, 4.5vw, 56px) 0;
  }

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

  .page-about .tl__node {
    flex-direction: row;
    align-items: baseline;
    gap: 18px;
    padding-left: 0;
  }

  .page-about .tl__year {
    flex: 0 0 66px;
    font-size: 17px;
  }

  .page-about .tl__title {
    font-size: 16px;
  }

  .page-about .about-timeline {
    padding-left: 34px;
  }

  .page-about .tl__node::before {
    left: -34px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-rail__link,
  .page-about .tl__node::before,
  .page-about .tl__title {
    transition: none;
  }
}