.page-about {
  background: var(--cream);
  color: var(--ink);
  font-family: var(--font-sans);
  overflow-x: hidden;
}

.page-about .about-h2 {
  font-size: clamp(1.55rem, 4.6vw, 2.6rem);
  line-height: 1.1;
  font-weight: 900;
  letter-spacing: -0.02em;
  margin: 12px 0 18px;
  max-width: 20ch;
}

.page-about .about-h2--on-dark {
  color: var(--cream);
}

/* ---------- 首屏 ---------- */
.page-about .about-lede {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(40px, 6vw, 80px);
  background: var(--cream);
}

.page-about .about-lede::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  width: 34%;
  background: repeating-linear-gradient(-45deg, rgba(11, 110, 79, 0.09) 0 2px, transparent 2px 16px);
  pointer-events: none;
}

.page-about .about-lede > .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-lede__title {
  font-size: clamp(2rem, 7vw, 4.9rem);
  line-height: 1.02;
  font-weight: 900;
  letter-spacing: -0.03em;
  margin: 14px 0 0;
  max-width: 15ch;
}

.page-about .about-lede__cols {
  display: grid;
  gap: 26px;
  margin-top: clamp(22px, 3.5vw, 36px);
}

.page-about .about-lede__text {
  max-width: 60ch;
  color: var(--deep);
  font-size: clamp(1rem, 2.2vw, 1.12rem);
  line-height: 1.9;
}

.page-about .about-start {
  border: var(--edge);
  border-left: 8px solid var(--lime);
  background: var(--white);
  box-shadow: var(--shadow-hard);
  padding: 20px 22px 22px;
}

.page-about .about-start__mono {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--pitch);
  margin: 0 0 10px;
}

.page-about .about-start__title {
  font-size: 1.12rem;
  font-weight: 900;
  line-height: 1.42;
  margin: 0 0 10px;
}

.page-about .about-start__text {
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--deep);
  margin: 0 0 18px;
}

.page-about .about-lede__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 数据带 ---------- */
.page-about .about-stats {
  background: var(--ink);
  color: var(--cream);
  padding: clamp(30px, 5vw, 54px) 0;
  border-top: 3px solid var(--ink);
  border-bottom: 3px solid var(--ink);
}

.page-about .about-stats__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: rgba(244, 241, 232, 0.22);
}

.page-about .about-stats__cell {
  background: var(--ink);
  padding: 18px 16px;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.8rem, 6vw, 2.9rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
  margin: 0;
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-stats__unit {
  font-size: 0.44em;
  font-weight: 500;
  color: var(--cream);
}

.page-about .about-stats__label {
  margin: 10px 0 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: rgba(244, 241, 232, 0.82);
}

/* ---------- 品牌起点 ---------- */
.page-about .about-origin {
  background: var(--white);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .about-origin__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-origin__body p {
  max-width: 62ch;
  line-height: 1.9;
  color: var(--deep);
  margin: 0 0 16px;
}

.page-about .about-origin__figure {
  margin: 0;
}

.page-about .tag {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  border: 2px solid var(--ink);
  background: var(--ink);
  color: var(--cream);
  padding: 4px 10px;
}

.page-about .tag--lime {
  background: var(--lime);
  color: var(--ink);
  border-color: var(--ink);
}

/* ---------- 城市网络 ---------- */
.page-about .about-network {
  background: var(--cream);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .about-network__head p,
.page-about .about-partners__head p {
  max-width: 64ch;
  line-height: 1.9;
  color: var(--deep);
}

.page-about .about-network__figure {
  margin: clamp(26px, 4vw, 40px) 0 0;
}

.page-about .region-row {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(22px, 3vw, 30px) 0;
  padding: 0;
}

.page-about .region-chip {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  border: 2px solid var(--ink);
  background: var(--pitch);
  color: var(--white);
  padding: 6px 12px;
}

.page-about .duty-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(220px, 1fr));
  gap: 16px;
}

.page-about .duty {
  border: var(--edge);
  border-top: 6px solid var(--pitch);
  background: var(--white);
  box-shadow: var(--shadow-soft);
  padding: 16px 18px 20px;
}

.page-about .duty__idx {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--pitch);
  margin: 0 0 8px;
}

.page-about .duty__title {
  font-size: 1.05rem;
  font-weight: 900;
  margin: 0 0 8px;
  letter-spacing: -0.01em;
}

.page-about .duty__text {
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--deep);
  margin: 0;
}

/* ---------- 加入之后 ---------- */
.page-about .about-service {
  background: var(--white);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .svc-list {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  border-top: var(--edge);
}

.page-about .svc {
  display: grid;
  grid-template-columns: 56px minmax(0, 1fr);
  gap: 14px;
  padding: 20px 0;
  border-bottom: var(--edge);
}

.page-about .svc__num {
  font-family: var(--font-mono);
  font-size: clamp(1.3rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--pitch);
}

.page-about .svc__title {
  font-size: 1.08rem;
  font-weight: 900;
  margin: 0 0 6px;
  letter-spacing: -0.01em;
}

.page-about .svc__text {
  font-size: 0.94rem;
  line-height: 1.8;
  color: var(--deep);
  margin: 0;
  max-width: 60ch;
}

/* ---------- 资料与版本 ---------- */
.page-about .about-version {
  background: var(--deep);
  color: var(--cream);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .about-version__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-version__figure {
  margin: 0;
}

.page-about .about-version__body p {
  max-width: 60ch;
  line-height: 1.9;
  color: rgba(244, 241, 232, 0.88);
  margin: 0 0 16px;
}

.page-about .about-version__body .btn {
  margin-top: 8px;
}

.page-about .about-version .media-frame__caption {
  color: rgba(244, 241, 232, 0.78);
}

/* ---------- 合作生态 ---------- */
.page-about .about-partners {
  background: var(--white);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: clamp(20px, 3vw, 28px) 0 10px;
}

.page-about .filter-status {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--gray);
  margin: 0 0 20px;
}

.page-about .partner-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
  gap: 16px;
}

.page-about .partner {
  border: var(--edge);
  background: var(--cream);
  box-shadow: var(--shadow-soft);
  padding: 18px 18px 20px;
  display: flex;
  flex-direction: column;
}

.page-about .partner[hidden] {
  display: none;
}

.page-about .partner__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--pitch);
  margin: 0 0 10px;
}

.page-about .partner__title {
  font-size: 1.1rem;
  font-weight: 900;
  letter-spacing: -0.01em;
  margin: 0 0 10px;
}

.page-about .partner__text {
  font-size: 0.92rem;
  line-height: 1.78;
  color: var(--deep);
  margin: 0;
}

.page-about .honor-strip {
  margin-top: clamp(24px, 4vw, 36px);
  border: var(--edge);
  background: var(--pitch);
  color: var(--white);
  box-shadow: var(--shadow-hard);
  padding: 22px 24px;
  display: grid;
  gap: 10px;
}

.page-about .honor-strip__num {
  font-family: var(--font-mono);
  font-size: clamp(2rem, 6vw, 3.2rem);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
  margin: 0;
  letter-spacing: -0.02em;
}

.page-about .honor-strip__text {
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.94);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  background: var(--cream);
  padding: clamp(44px, 7vw, 88px) 0;
}

.page-about .tl {
  margin-top: clamp(22px, 3.5vw, 36px);
  border-left: 3px solid var(--ink);
  padding-left: 0;
}

.page-about .tl__item {
  position: relative;
  padding-left: 24px;
  margin-bottom: 12px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: -10px;
  top: 16px;
  width: 15px;
  height: 15px;
  border: 3px solid var(--ink);
  border-radius: 50%;
  background: var(--cream);
  transition: background 160ms ease, box-shadow 160ms ease;
}

.page-about .tl__item[open]::before {
  background: var(--lime);
  box-shadow: 0 0 0 5px rgba(198, 255, 74, 0.42);
}

.page-about .tl__sum {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px 14px;
  cursor: pointer;
  list-style: none;
  padding: 10px 0;
}

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

.page-about .tl__sum::after {
  content: "+";
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--pitch);
  margin-left: auto;
  line-height: 1;
}

.page-about .tl__item[open] .tl__sum::after {
  content: "–";
}

.page-about .tl__year {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: clamp(1.1rem, 4vw, 1.65rem);
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .tl__title {
  font-weight: 700;
  font-size: 1rem;
  line-height: 1.5;
}

.page-about .tl__body {
  max-width: 62ch;
  padding: 0 0 14px;
  color: var(--deep);
}

.page-about .tl__body p {
  margin: 0;
  line-height: 1.88;
  font-size: 0.95rem;
}

/* ---------- 收尾 ---------- */
.page-about .about-next {
  background: var(--pitch);
  color: var(--white);
  padding: clamp(40px, 6vw, 72px) 0;
  border-top: 3px solid var(--ink);
}

.page-about .about-next__title {
  font-size: clamp(1.5rem, 4.6vw, 2.4rem);
  font-weight: 900;
  letter-spacing: -0.02em;
  line-height: 1.1;
  margin: 0 0 12px;
}

.page-about .about-next__text {
  max-width: 58ch;
  margin: 0 0 22px;
  line-height: 1.85;
  color: rgba(255, 255, 255, 0.92);
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 显现 ---------- */
.page-about [data-reveal] {
  opacity: 1;
}

.page-about.has-js [data-reveal] {
  opacity: 0;
  transform: translateY(16px);
  transition: opacity 420ms ease, transform 420ms ease;
}

.page-about.has-js [data-reveal].is-visible {
  opacity: 1;
  transform: none;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-stats__cell {
    padding: 24px 22px;
  }

  .page-about .honor-strip {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: center;
    gap: 22px;
  }
}

@media (min-width: 860px) {
  .page-about .about-lede__cols {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.85fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.95fr);
    gap: 52px;
    align-items: center;
  }

  .page-about .about-version__grid {
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: 52px;
    align-items: center;
  }

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

  .page-about .svc {
    grid-template-columns: 92px minmax(0, 1fr);
    gap: 20px;
    padding: 24px 0;
  }

  .page-about .tl__sum {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr) auto;
    gap: 20px;
    align-items: center;
  }

  .page-about .tl__body {
    padding-left: 160px;
  }

  .page-about .tl__item::before {
    top: 18px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-lede::after {
    width: 30%;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about.has-js [data-reveal],
  .page-about.has-js [data-reveal].is-visible {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about .tl__item::before {
    transition: none;
  }
}