.page-about {
  --about-copper-deep: #8A5B26;
  --about-gap: clamp(1.25rem, 3vw, 2.5rem);
  --about-radius: var(--r-lg);
}

/* 首屏：主题声明 + 章节坐标，不使用横幅 */
.page-about .about-intro {
  display: grid;
  gap: clamp(1.75rem, 4vw, 3rem);
  padding-block: clamp(1.75rem, 5vw, 3.5rem) clamp(2rem, 5vw, 3.5rem);
}

.page-about .about-intro__lead h1 {
  margin: 0.75rem 0 1.1rem;
  font-family: var(--font-head);
  font-size: clamp(2rem, 6vw, 3.6rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--paper);
  max-width: 16ch;
}

.page-about .about-intro__lead .lede {
  max-width: 60ch;
  color: var(--mist);
}

.page-about .about-intro__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  align-items: center;
  margin-top: 1.5rem;
}

.page-about .about-index {
  background: linear-gradient(160deg, var(--ink-800), var(--ink-850));
  border: 1px solid var(--line);
  border-left: 3px solid var(--copper);
  border-radius: var(--about-radius);
  padding: clamp(1.1rem, 3vw, 1.6rem);
  align-self: start;
}

.page-about .about-index__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--copper-soft);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-index__list li + li {
  border-top: 1px solid var(--line);
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding: 0.7rem 0.1rem;
  color: var(--paper);
  font-size: 0.95rem;
  text-decoration: none;
  transition: color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 0.78rem;
  color: var(--mist);
  letter-spacing: 0.06em;
  transition: color 0.25s var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--teal);
  transform: translateX(4px);
}

.page-about .about-index__link:hover .about-index__num,
.page-about .about-index__link:focus-visible .about-index__num {
  color: var(--copper-soft);
}

/* 01 品牌起点 */
.page-about .about-origin__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-origin__text h2 {
  margin: 0.6rem 0 1.25rem;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-origin__text .prose p {
  color: var(--mist);
}

.page-about .about-origin__facts {
  display: grid;
  gap: 0;
  border-top: 1px solid var(--line);
  align-self: start;
}

.page-about .about-fact {
  display: grid;
  gap: 0.2rem;
  padding: 1rem 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-fact__key {
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--copper);
}

.page-about .about-fact__val {
  font-family: var(--font-head);
  font-size: clamp(1.15rem, 2.4vw, 1.45rem);
  color: var(--paper);
  letter-spacing: -0.01em;
}

.page-about .about-fact__sub {
  font-size: 0.86rem;
  line-height: 1.6;
  color: var(--muted);
}

/* 02 服务网络 */
.page-about .about-network__head h2 {
  margin: 0.6rem 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-network__head .lede {
  max-width: 62ch;
  color: var(--mist);
}

.page-about .about-stats {
  display: grid;
  gap: 0;
  margin: clamp(1.75rem, 4vw, 2.75rem) 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}

.page-about .about-stat {
  padding: 1.25rem 0.25rem;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-stat:last-child {
  border-bottom: 0;
}

.page-about .about-stat__label {
  font-family: var(--font-mono);
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-stat__value {
  margin: 0.35rem 0 0;
  display: flex;
  align-items: baseline;
  gap: 0.35rem;
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-size: clamp(2.4rem, 7vw, 3.6rem);
  line-height: 1;
  color: var(--copper);
  letter-spacing: -0.02em;
}

.page-about .about-stat--accent .about-stat__num {
  color: var(--teal);
}

.page-about .about-stat__unit {
  font-size: 0.95rem;
  color: var(--mist);
}

.page-about .about-network__body {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--about-radius);
}

.page-about .about-figure .media__img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-network__aside {
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  padding: clamp(1rem, 3vw, 1.5rem);
  background: radial-gradient(120% 100% at 0% 0%, rgba(39, 70, 95, 0.55), transparent 70%), var(--ink-850);
}

.page-about .about-nodes {
  display: block;
  width: 100%;
  height: auto;
  overflow: visible;
}

.page-about .about-nodes__routes polyline {
  fill: none;
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 4 5;
}

.page-about .about-nodes__dots circle {
  fill: var(--mist);
  opacity: 0.85;
  transition: fill 0.25s var(--ease), transform 0.25s var(--ease);
  transform-box: fill-box;
  transform-origin: center;
}

.page-about .about-nodes__dots circle:hover {
  fill: var(--teal);
  transform: scale(1.7);
}

.page-about .about-nodes__origin {
  fill: var(--copper);
}

.page-about .about-nodes__halo {
  fill: none;
  stroke: var(--copper-soft);
  stroke-width: 1;
  opacity: 0.55;
}

.page-about .about-network__note {
  margin: 0.9rem 0 0.5rem;
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  color: var(--copper-soft);
}

.page-about .about-network__caption {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--mist);
}

/* 03 发展历程 */
.page-about .about-timeline__head h2 {
  margin: 0.6rem 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-timeline__head .lede {
  max-width: 62ch;
  color: var(--mist);
}

.page-about .about-timeline__figure {
  margin: clamp(1.5rem, 4vw, 2.5rem) 0 clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .tl {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .tl-row {
  display: grid;
  grid-template-columns: 4.25rem minmax(0, 1fr);
  gap: 0.85rem;
  padding: 1.2rem 0;
  border-bottom: 1px solid var(--line);
  transition: background 0.3s var(--ease), padding-left 0.3s var(--ease);
}

.page-about .tl-row:hover,
.page-about .tl-row:focus-within {
  background: linear-gradient(90deg, rgba(185, 133, 75, 0.16), transparent 62%);
  padding-left: 0.65rem;
}

.page-about .tl-row__year {
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  color: var(--copper);
  transition: color 0.25s var(--ease);
}

.page-about .tl-row:hover .tl-row__year,
.page-about .tl-row:focus-within .tl-row__year {
  color: var(--copper-soft);
}

.page-about .tl-row__body {
  max-width: 66ch;
}

.page-about .tl-row:nth-child(even) .tl-row__body {
  max-width: 52ch;
}

.page-about .tl-row__title {
  margin: 0 0 0.45rem;
  font-family: var(--font-head);
  font-size: clamp(1.05rem, 2.2vw, 1.25rem);
  letter-spacing: -0.01em;
  color: var(--paper);
}

.page-about .tl-row__text {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .tl-row__links {
  margin: 0.7rem 0 0;
}

.page-about .tl-row__links .link-arrow {
  font-size: 0.9rem;
}

/* 04 团队与治理（浅底长文区） */
.page-about .about-team {
  color: var(--text-dark);
}

.page-about .about-team .eyebrow {
  color: var(--about-copper-deep);
}

.page-about .about-team__grid {
  display: grid;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-team__text h2 {
  margin: 0.6rem 0 1.25rem;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--text-dark);
}

.page-about .about-team__text .prose p {
  color: #38495A;
}

.page-about .about-team__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem 1.5rem;
  margin-top: 1.25rem;
}

.page-about .about-team__links .link-arrow {
  color: #116E60;
}

.page-about .about-team__figure {
  border: 1px solid #CBD8E1;
}

.page-about .about-team__figure .media__caption {
  color: var(--muted);
}

.page-about .about-guard {
  display: grid;
  gap: 0;
  margin-top: clamp(1.75rem, 4vw, 2.75rem);
  border-top: 1px solid #CBD8E1;
}

.page-about .about-guard__item {
  padding: 1.1rem 0.15rem;
  border-bottom: 1px solid #CBD8E1;
}

.page-about .about-guard__key {
  margin: 0 0 0.3rem;
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-copper-deep);
}

.page-about .about-guard__val {
  margin: 0 0 0.35rem;
  font-family: var(--font-head);
  font-size: clamp(1.15rem, 2.4vw, 1.4rem);
  color: var(--text-dark);
}

.page-about .about-guard__desc {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.7;
  color: var(--muted);
}

/* 05 合作生态与认可 */
.page-about .about-partners__head h2 {
  margin: 0.6rem 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(1.55rem, 3.6vw, 2.35rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-partners__head .lede {
  max-width: 62ch;
  color: var(--mist);
}

.page-about .about-partners__grid {
  display: grid;
  gap: 1rem;
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
}

.page-about .about-partner-card {
  padding: clamp(1.1rem, 3vw, 1.55rem);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: var(--ink-850);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-partner-card:hover {
  border-color: var(--copper);
  transform: translateY(-3px);
}

.page-about .about-partner-card__num {
  margin: 0 0 0.6rem;
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--copper-soft);
}

.page-about .about-partner-card__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-head);
  font-size: 1.1rem;
  color: var(--paper);
}

.page-about .about-partner-card__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-partner-card--honor {
  background: linear-gradient(150deg, rgba(185, 133, 75, 0.16), transparent 65%), var(--ink-800);
  border-color: rgba(185, 133, 75, 0.5);
}

/* 06 未来路线 */
.page-about .about-roadmap__panel {
  padding: clamp(1.4rem, 4vw, 2.75rem);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  background: radial-gradient(130% 120% at 100% 0%, rgba(47, 211, 181, 0.12), transparent 55%), var(--ink-800);
}

.page-about .about-roadmap__head h2 {
  margin: 0.6rem 0 1rem;
  font-family: var(--font-head);
  font-size: clamp(1.5rem, 3.4vw, 2.15rem);
  line-height: 1.25;
  letter-spacing: -0.015em;
  color: var(--paper);
}

.page-about .about-roadmap__head .lede {
  max-width: 60ch;
  color: var(--mist);
}

.page-about .about-roadmap__list {
  list-style: none;
  margin: clamp(1.25rem, 3vw, 2rem) 0 0;
  padding: 0;
  display: grid;
  gap: 1rem;
}

.page-about .about-roadmap__item {
  display: grid;
  grid-template-columns: 2rem minmax(0, 1fr);
  gap: 0.85rem;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
}

.page-about .about-roadmap__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 1.85rem;
  height: 1.85rem;
  border: 1px solid var(--copper);
  border-radius: 50%;
  font-size: 0.78rem;
  color: var(--copper-soft);
}

.page-about .about-roadmap__title {
  margin: 0 0 0.4rem;
  font-family: var(--font-head);
  font-size: 1.02rem;
  color: var(--paper);
}

.page-about .about-roadmap__text {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .about-cta {
  margin-top: clamp(1.5rem, 4vw, 2.25rem);
  padding-top: clamp(1.1rem, 3vw, 1.6rem);
  border-top: 1px solid var(--line);
}

.page-about .about-cta__text {
  margin: 0 0 1rem;
  font-size: 0.98rem;
  line-height: 1.7;
  color: var(--paper);
}

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

/* 断点：平板 */
@media (min-width: 720px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.7fr);
    gap: clamp(1.75rem, 4vw, 3rem);
  }

  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    border-bottom: 1px solid var(--line);
  }

  .page-about .about-stat {
    padding: 1.5rem 1rem 1.5rem 0;
    border-bottom: 0;
    border-right: 1px dashed var(--line);
  }

  .page-about .about-stat:last-child {
    border-right: 0;
    padding-left: 1rem;
  }

  .page-about .about-stat:nth-child(2) {
    padding-left: 1rem;
  }

  .page-about .about-network__body {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
    align-items: stretch;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: clamp(1.75rem, 4vw, 3rem);
  }

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

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

/* 断点：桌面 */
@media (min-width: 1000px) {
  .page-about .about-intro {
    grid-template-columns: minmax(0, 1.4fr) minmax(260px, 0.6fr);
    gap: clamp(2rem, 5vw, 4rem);
    align-items: start;
  }

  .page-about .about-index {
    position: sticky;
    top: 1.5rem;
  }

  .page-about .about-network__head {
    display: grid;
    grid-template-columns: minmax(0, 0.9fr) minmax(0, 1.1fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: end;
  }

  .page-about .about-network__head h2 {
    margin-bottom: 0;
  }

  .page-about .about-timeline__head {
    display: grid;
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: end;
  }

  .page-about .about-timeline__head h2 {
    margin-bottom: 0;
  }

  .page-about .tl-row {
    grid-template-columns: 7.5rem minmax(0, 1fr);
    gap: 1.75rem;
    padding: 1.5rem 0;
  }

  .page-about .tl-row__year {
    font-size: 1.15rem;
  }

  .page-about .about-timeline__figure {
    max-width: 78%;
    margin-left: auto;
  }

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

  .page-about .about-roadmap__panel {
    display: grid;
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    gap: clamp(1.75rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .about-roadmap__list {
    margin-top: 0;
  }

  .page-about .about-cta {
    grid-column: 1 / -1;
  }
}