.page-about {
  --about-edge: 2px solid var(--grid-line);
  --about-hard: 8px 8px 0 rgba(6, 17, 13, .9);
  --about-soft: 6px 6px 0 rgba(6, 17, 13, .78);
  --about-muted: rgba(244, 248, 245, .74);
  background: var(--ink);
  color: var(--white);
  overflow-x: clip;
}

.page-about .section {
  padding-block: clamp(38px, 6vw, 76px);
}

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

.page-about .kicker {
  color: var(--lime);
}

.page-about .section--light .kicker {
  color: var(--grid-line);
}

.page-about .band-head {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: clamp(20px, 3vw, 34px);
  max-width: 62ch;
}

.page-about .band-head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.2vw, 2.8rem);
  line-height: 1.04;
  letter-spacing: -.025em;
}

.page-about .band-head__lead {
  margin: 0;
  font-size: clamp(.95rem, 1.6vw, 1.05rem);
  line-height: 1.72;
  color: var(--about-muted);
}

.page-about .section--light .band-head__lead {
  color: #3d4a44;
}

/* ---------- 首屏 ---------- */
.page-about .mission-hero {
  position: relative;
  padding-block: clamp(18px, 3vw, 30px) clamp(30px, 5vw, 60px);
  background:
    radial-gradient(120% 90% at 84% 8%, rgba(53, 224, 200, .16), transparent 58%),
    radial-gradient(90% 70% at 4% 96%, rgba(255, 92, 43, .12), transparent 62%),
    linear-gradient(162deg, var(--ink-deep) 0%, var(--ink) 64%);
  border-bottom: var(--about-edge);
  overflow: hidden;
}

.page-about .mission-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(116, 130, 123, .16) 0 1px, transparent 1px 92px);
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .95), transparent 80%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, .95), transparent 80%);
  pointer-events: none;
}

.page-about .mission-hero .crumbs {
  position: relative;
  z-index: 2;
}

.page-about .mission-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(24px, 4vw, 46px);
  margin-top: clamp(18px, 3vw, 30px);
}

.page-about .mission-hero__copy h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(2.3rem, 7.2vw, 4.6rem);
  line-height: .97;
  letter-spacing: -.035em;
  text-wrap: balance;
}

.page-about .mission-hero__copy h1 em {
  font-style: normal;
  color: var(--lime);
  background: linear-gradient(transparent 68%, rgba(200, 255, 77, .22) 68%);
}

.page-about .mission-hero__lede {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: clamp(.98rem, 1.8vw, 1.08rem);
  line-height: 1.78;
  color: var(--about-muted);
}

.page-about .mission-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}

.page-about .mission-hero__visual {
  position: relative;
  z-index: 0;
  margin: 0;
}

.page-about .mission-hero__visual::after {
  content: "";
  position: absolute;
  right: -8px;
  bottom: -12px;
  width: 48%;
  height: 40%;
  background: var(--lime);
  transform: skewX(-6deg);
  z-index: -1;
}

.page-about .mission-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 9 / 11;
  object-fit: cover;
  border: var(--about-edge);
  box-shadow: var(--about-hard);
}

.page-about .about-anchors {
  position: relative;
  z-index: 1;
  display: flex;
  gap: 8px;
  margin-top: clamp(22px, 3.4vw, 34px);
  padding-top: 14px;
  border-top: 1px dashed var(--grid-line);
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-anchors a {
  flex: none;
  padding: 6px 12px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .04em;
  color: var(--white);
  text-decoration: none;
  border: 1px solid var(--grid-line);
  background: rgba(35, 43, 39, .6);
  transition: color .2s var(--ease), border-color .2s var(--ease), background .2s var(--ease);
}

.page-about .about-anchors a:hover,
.page-about .about-anchors a:focus-visible {
  color: var(--ink-deep);
  background: var(--lime);
  border-color: var(--lime);
}

/* ---------- 主张带 ---------- */
.page-about .mission-statement {
  position: relative;
  padding-block: clamp(30px, 5vw, 56px);
  background: var(--lime);
  color: var(--ink-deep);
  border-bottom: var(--about-edge);
}

.page-about .mission-statement::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: clamp(48px, 12vw, 160px);
  height: 100%;
  background: repeating-linear-gradient(115deg, rgba(10, 28, 22, .2) 0 2px, transparent 2px 14px);
  pointer-events: none;
}

.page-about .mission-statement__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: .74rem;
  letter-spacing: .18em;
  color: #2a4a1f;
}

.page-about .mission-statement__text {
  margin: 0;
  max-width: 30ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.8vw, 2.7rem);
  line-height: 1.18;
  letter-spacing: -.02em;
}

/* ---------- 服务对象 ---------- */
.page-about .audience-band {
  display: grid;
  gap: 16px;
  grid-template-columns: 1fr;
}

.page-about .audience-item {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--carbon);
  border: var(--about-edge);
  box-shadow: var(--about-soft);
}

.page-about .audience-item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: var(--lime);
}

.page-about .audience-item--orange::before {
  background: var(--orange);
}

.page-about .audience-item--cyan::before {
  background: var(--cyan);
}

.page-about .audience-item__no {
  font-family: var(--font-mono);
  font-size: 1.6rem;
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  margin-top: 6px;
}

.page-about .audience-item--orange .audience-item__no {
  color: var(--orange);
}

.page-about .audience-item--cyan .audience-item__no {
  color: var(--cyan);
}

.page-about .audience-item h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(1.15rem, 2.2vw, 1.4rem);
  font-weight: 700;
  letter-spacing: -.01em;
  line-height: 1.2;
}

.page-about .audience-item p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.76;
  color: var(--about-muted);
}

.page-about .audience-item .audience-item__gain {
  margin-top: auto;
  padding-left: 12px;
  border-left: 3px solid var(--lime);
  color: var(--white);
  font-size: .9rem;
  line-height: 1.66;
}

.page-about .audience-item--orange .audience-item__gain {
  border-left-color: var(--orange);
}

.page-about .audience-item--cyan .audience-item__gain {
  border-left-color: var(--cyan);
}

/* ---------- 协作链路 ---------- */
.page-about .route-map {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
}

.page-about .route-map__node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 16px 18px 18px;
  background: #fff;
  border: 2px solid var(--grid-line);
  box-shadow: 5px 5px 0 rgba(27, 58, 47, .18);
}

.page-about .route-map__no {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  line-height: 1;
  color: var(--grid-line);
}

.page-about .route-map__node h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink-deep);
  line-height: 1.2;
}

.page-about .route-map__node p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: #3d4a44;
}

.page-about .route-map__node .tag {
  align-self: flex-start;
  margin-top: 4px;
}

.page-about .route-note {
  display: flex;
  flex-direction: column;
  gap: 16px;
  align-items: flex-start;
  margin-top: clamp(20px, 3vw, 30px);
  padding: 18px 20px;
  border-left: 6px solid var(--orange);
  background: rgba(27, 58, 47, .07);
}

.page-about .route-note p {
  margin: 0;
  font-size: .95rem;
  line-height: 1.78;
  color: #2c3a34;
}

/* ---------- 内容与数据方法 ---------- */
.page-about .methods-grid {
  display: grid;
  gap: clamp(24px, 4vw, 44px);
  grid-template-columns: 1fr;
}

.page-about .methods-copy h2 {
  margin: 10px 0 clamp(18px, 3vw, 26px);
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.7rem, 4.2vw, 2.8rem);
  line-height: 1.04;
  letter-spacing: -.025em;
}

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

.page-about .method-step {
  display: grid;
  grid-template-columns: 46px 1fr;
  gap: 14px;
  padding: 16px 0;
  border-top: 1px solid var(--grid-line);
}

.page-about .method-step:last-child {
  border-bottom: 1px solid var(--grid-line);
}

.page-about .method-step__no {
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 700;
  color: var(--lime);
  padding-top: 3px;
}

.page-about .method-step h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 1.18rem;
  font-weight: 700;
  letter-spacing: -.01em;
}

.page-about .method-step p {
  margin: 0;
  font-size: .93rem;
  line-height: 1.74;
  color: var(--about-muted);
}

.page-about .methods-figure {
  margin: 0;
  align-self: start;
}

.page-about .methods-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border: var(--about-edge);
  box-shadow: var(--about-soft);
}

.page-about .methods-figure figcaption {
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: .76rem;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--mid);
}

.page-about .principle-band {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  margin-top: clamp(28px, 4.4vw, 48px);
}

.page-about .principle-item {
  padding: 18px 18px 20px;
  background: var(--ink-deep);
  border-top: 3px solid var(--orange);
}

.page-about .principle-item--wide {
  border-top-color: var(--lime);
}

.page-about .principle-item__label {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: .72rem;
  letter-spacing: .16em;
  color: var(--mid);
}

.page-about .principle-item h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 1.16rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .principle-item p {
  margin: 0;
  font-size: .9rem;
  line-height: 1.74;
  color: var(--about-muted);
}

/* ---------- 时间轴 ---------- */
.page-about .section--timeline {
  border-top: var(--about-edge);
  border-bottom: var(--about-edge);
}

.page-about .timeline-figure {
  margin: 0 0 clamp(22px, 3.4vw, 34px);
}

.page-about .timeline-figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 5;
  object-fit: cover;
  border: 2px solid var(--grid-line);
  background: var(--carbon);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--grid-line);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 4px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 20px;
  width: 11px;
  height: 11px;
  background: var(--white);
  border: 2px solid var(--grid-line);
  transform: rotate(45deg);
}

.page-about .timeline__item details {
  border-bottom: 1px solid rgba(27, 58, 47, .22);
}

.page-about .timeline__item summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 14px;
  padding: 14px 0;
  cursor: pointer;
  list-style: none;
}

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

.page-about .timeline__item summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--orange);
  line-height: 1;
}

.page-about .timeline__item details[open] summary::after {
  content: "\2212";
}

.page-about .timeline__year {
  font-family: var(--font-mono);
  font-size: 1.05rem;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--ink-deep);
  min-width: 4.2ch;
}

.page-about .timeline__stage {
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--ink-deep);
}

.page-about .timeline__item details p {
  margin: 0 0 16px;
  max-width: 62ch;
  font-size: .94rem;
  line-height: 1.8;
  color: #3d4a44;
}

.page-about .timeline__item details[open] .timeline__year {
  color: var(--orange);
}

/* ---------- 团队 ---------- */
.page-about .team-layout {
  display: grid;
  gap: clamp(22px, 3.6vw, 40px);
  grid-template-columns: 1fr;
}

.page-about .team-stats {
  display: grid;
  gap: 2px;
  grid-template-columns: 1fr;
  background: var(--grid-line);
  border: var(--about-edge);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 18px 20px;
  background: var(--ink-deep);
}

.page-about .stat__num {
  font-family: var(--font-display);
  font-size: clamp(2rem, 5vw, 2.9rem);
  font-weight: 800;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--lime);
  font-variant-numeric: tabular-nums;
}

.page-about .stat:nth-child(2) .stat__num,
.page-about .stat:nth-child(4) .stat__num {
  color: var(--cyan);
}

.page-about .stat__label {
  font-size: .82rem;
  line-height: 1.6;
  color: var(--about-muted);
}

.page-about .service-scope {
  padding: clamp(20px, 3vw, 28px);
  background: var(--carbon);
  border: var(--about-edge);
  box-shadow: var(--about-soft);
}

.page-about .service-scope h3 {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: 1.3rem;
  font-weight: 700;
  letter-spacing: -.01em;
  color: var(--white);
}

.page-about .service-scope__list {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .service-scope__list li {
  display: grid;
  grid-template-columns: 12px 1fr;
  gap: 10px;
  font-size: .9rem;
  line-height: 1.72;
  color: var(--about-muted);
}

.page-about .service-scope__list .dot {
  width: 8px;
  height: 8px;
  margin-top: 9px;
  background: var(--lime);
  border-radius: 50%;
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  padding-block: clamp(36px, 6vw, 70px);
  background: linear-gradient(150deg, var(--ink-deep) 0%, var(--ink) 100%);
  border-top: var(--about-edge);
}

.page-about .about-next__inner {
  display: grid;
  gap: 20px;
  grid-template-columns: 1fr;
  align-items: center;
}

.page-about .about-next__inner h2 {
  margin: 8px 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.6rem, 4vw, 2.5rem);
  line-height: 1.06;
  letter-spacing: -.025em;
}

.page-about .about-next__inner p {
  margin: 0;
  max-width: 56ch;
  font-size: .96rem;
  line-height: 1.76;
  color: var(--about-muted);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

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

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

  .page-about .principle-item--wide {
    grid-column: span 2;
  }
}

@media (min-width: 820px) {
  .page-about .audience-band {
    grid-template-columns: 1.25fr 1fr .88fr;
    align-items: stretch;
  }

  .page-about .route-map {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .route-map::before {
    content: "";
    position: absolute;
    top: 46px;
    left: 5%;
    right: 5%;
    height: 2px;
    background: repeating-linear-gradient(90deg, var(--grid-line) 0 8px, transparent 8px 16px);
    z-index: 0;
  }

  .page-about .route-map__node {
    z-index: 1;
  }

  .page-about .route-note {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }

  .page-about .route-note p {
    max-width: 72ch;
  }

  .page-about .principle-band {
    grid-template-columns: 1.4fr 1fr 1fr;
  }

  .page-about .principle-item--wide {
    grid-column: auto;
  }

  .page-about .about-next__inner {
    grid-template-columns: minmax(0, 1fr) auto;
    gap: 32px;
  }
}

@media (min-width: 900px) {
  .page-about .mission-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .85fr);
    align-items: start;
  }

  .page-about .mission-hero__visual {
    margin-top: 6px;
  }

  .page-about .methods-grid {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    align-items: start;
  }

  .page-about .methods-figure {
    position: sticky;
    top: 120px;
  }

  .page-about .team-layout {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1080px) {
  .page-about .timeline {
    padding-left: 0;
    display: grid;
    gap: 0 32px;
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .timeline::before {
    left: 50%;
    top: 8px;
    bottom: 8px;
  }

  .page-about .timeline__item {
    padding-right: 32px;
  }

  .page-about .timeline__item:nth-child(even) {
    padding-right: 0;
    padding-left: 32px;
    grid-column: 2;
  }

  .page-about .timeline__item:nth-child(odd) {
    grid-column: 1;
    text-align: right;
  }

  .page-about .timeline__item:nth-child(odd) summary {
    flex-direction: row-reverse;
    justify-content: flex-start;
  }

  .page-about .timeline__item:nth-child(odd) summary::after {
    margin-left: 0;
    margin-right: auto;
  }

  .page-about .timeline__item:nth-child(odd) details p {
    margin-left: auto;
  }

  .page-about .timeline__item::before {
    left: auto;
    right: -5px;
    top: 22px;
  }

  .page-about .timeline__item:nth-child(even)::before {
    right: auto;
    left: -6px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-anchors a {
    transition: none;
  }
}