.page-about {
  --about-pad: clamp(56px, 8vw, 120px);
  --about-rule: 1px solid var(--line);
  position: relative;
  overflow-x: clip;
  color: var(--bone);
}

.page-about [id] {
  scroll-margin-top: calc(var(--header-h) + 24px);
}

/* ---------- 01 首屏 ---------- */

.page-about .about-hero {
  padding: clamp(28px, 5vw, 56px) 0 var(--about-pad);
  position: relative;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 48px);
}

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

.page-about .about-hero__main {
  max-width: 40em;
}

.page-about .about-hero__lede {
  margin-top: clamp(16px, 2vw, 24px);
  max-width: 36em;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 16px;
  margin-top: clamp(24px, 3vw, 40px);
}

.page-about .about-hero__aside {
  border-top: var(--about-rule);
  padding-top: clamp(20px, 3vw, 28px);
}

.page-about .about-figures {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 18px;
}

.page-about .about-figure {
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-about .about-figure__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--bone);
  letter-spacing: -0.02em;
}

.page-about .about-figure__unit {
  font-size: 0.48em;
  margin-left: 0.14em;
  color: var(--slate);
}

.page-about .about-figure__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--slate);
}

@media (min-width: 960px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
    column-gap: clamp(40px, 6vw, 104px);
    align-items: center;
  }

  .page-about .about-hero__aside {
    border-top: 0;
    border-left: var(--about-rule);
    padding-top: 0;
    padding-left: clamp(24px, 3vw, 44px);
  }

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

/* ---------- 02 运营轨迹 ---------- */

.page-about .about-track {
  position: relative;
  padding: var(--about-pad) 0;
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--jade-700) 14%, var(--jade-700) 86%, var(--ink-900) 100%);
}

.page-about .about-track__head {
  max-width: 44em;
  margin-bottom: clamp(36px, 5vw, 64px);
}

.page-about .about-track__lead {
  margin-top: 16px;
  color: var(--bone-soft);
  font-size: 16px;
  line-height: 1.75;
}

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

.page-about .track::before {
  content: "";
  position: absolute;
  left: 17px;
  top: 22px;
  bottom: 22px;
  width: 1px;
  background: linear-gradient(180deg, rgba(201, 160, 90, 0.55) 0%, rgba(138, 155, 192, 0.28) 55%, rgba(138, 155, 192, 0.06) 100%);
}

.page-about .track__item {
  position: relative;
}

.page-about .track-node {
  border-bottom: var(--about-rule);
}

.page-about .track-node__summary {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr) 20px;
  column-gap: 16px;
  row-gap: 6px;
  align-items: center;
  padding: clamp(18px, 2.6vw, 26px) 0;
  cursor: pointer;
  list-style: none;
  transition: background 160ms ease;
}

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

.page-about .track-node__summary:focus-visible {
  outline: 2px solid var(--neon);
  outline-offset: 3px;
}

.page-about .track-node__num {
  grid-row: 1 / 3;
  justify-self: start;
  align-self: center;
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border: 1px solid var(--line-strong);
  border-radius: 50%;
  background: var(--jade-700);
  font-family: var(--font-mono);
  font-size: 12px;
  font-variant-numeric: tabular-nums;
  color: var(--copper);
  position: relative;
  z-index: 1;
  transition: border-color 160ms ease, color 160ms ease, box-shadow 160ms ease;
}

.page-about .track-node__stage {
  grid-column: 2;
  align-self: end;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--copper);
}

.page-about .track-node__title {
  grid-column: 2;
  align-self: start;
  font-family: var(--font-display);
  font-size: clamp(17px, 2vw, 21px);
  font-weight: 800;
  line-height: 1.45;
  color: var(--bone);
}

.page-about .track-node__plus {
  grid-column: 3;
  grid-row: 1 / 3;
  align-self: center;
  justify-self: end;
  position: relative;
  width: 14px;
  height: 14px;
}

.page-about .track-node__plus::before,
.page-about .track-node__plus::after {
  content: "";
  position: absolute;
  background: var(--slate);
  transition: transform 160ms ease, background 160ms ease;
}

.page-about .track-node__plus::before {
  left: 0;
  top: 6px;
  width: 14px;
  height: 1px;
}

.page-about .track-node__plus::after {
  top: 0;
  left: 6px;
  width: 1px;
  height: 14px;
}

.page-about .track-node[open] .track-node__plus::after {
  transform: scaleY(0);
}

.page-about .track-node__summary:hover .track-node__num,
.page-about .track-node[open] .track-node__num {
  border-color: var(--neon);
  color: var(--neon);
  box-shadow: 0 0 0 4px rgba(57, 255, 136, 0.12);
}

.page-about .track-node__summary:hover .track-node__plus::before,
.page-about .track-node__summary:hover .track-node__plus::after {
  background: var(--flame);
}

.page-about .track-node__body {
  padding: 0 0 clamp(20px, 2.8vw, 30px) 50px;
  max-width: 46em;
}

.page-about .track-node__body p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--bone-soft);
}

@media (min-width: 860px) {
  .page-about .track-node__summary {
    grid-template-columns: 34px 160px minmax(0, 1fr) 20px;
    column-gap: 24px;
  }

  .page-about .track-node__num {
    grid-row: 1;
  }

  .page-about .track-node__stage {
    grid-column: 2;
    align-self: center;
  }

  .page-about .track-node__title {
    grid-column: 3;
    align-self: center;
  }

  .page-about .track-node__plus {
    grid-column: 4;
    grid-row: 1;
  }

  .page-about .track::before {
    left: 17px;
  }

  .page-about .track-node__body {
    padding-left: 218px;
  }
}

/* ---------- 03 团队分工 ---------- */

.page-about .about-team {
  padding: var(--about-pad) 0;
}

.page-about .about-team__head {
  max-width: 46em;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-team__lead {
  margin-top: 16px;
  color: var(--bone-soft);
  font-size: 16px;
  line-height: 1.8;
}

.page-about .about-team__media {
  margin: 0 0 clamp(36px, 5vw, 72px);
  aspect-ratio: 3 / 2;
}

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

.page-about .about-team__cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 40px);
}

.page-about .about-role {
  border-top: 2px solid var(--copper);
  padding-top: clamp(18px, 2.4vw, 26px);
  transition: opacity 200ms ease, transform 200ms ease;
}

.page-about .about-role__figure {
  margin: 0 0 14px;
  display: flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .about-role__num {
  font-family: var(--font-mono);
  font-size: clamp(38px, 6vw, 56px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 0.95;
  color: var(--bone);
  letter-spacing: -0.03em;
}

.page-about .about-role__unit {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.04em;
  color: var(--slate);
}

.page-about .about-role__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 23px);
  font-weight: 800;
  color: var(--bone);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--bone-soft);
  max-width: 34em;
}

@media (min-width: 860px) {
  .page-about .about-team__cols {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(24px, 3.4vw, 56px);
    align-items: start;
  }

  .page-about .about-role:nth-child(2) {
    transform: translateY(clamp(24px, 4vw, 64px));
  }

  .page-about .about-role:nth-child(3) {
    transform: translateY(clamp(12px, 2vw, 30px));
  }

  .page-about .about-team__cols:hover .about-role {
    opacity: 0.42;
  }

  .page-about .about-team__cols:hover .about-role:hover {
    opacity: 1;
  }
}

/* ---------- 04 数据链路 ---------- */

.page-about .about-pipeline {
  padding: var(--about-pad) 0;
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--ink-800) 50%, var(--ink-900) 100%);
}

.page-about .about-pipeline__top {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  align-items: start;
  margin-bottom: clamp(40px, 6vw, 76px);
}

.page-about .about-pipeline__intro {
  max-width: 40em;
}

.page-about .about-pipeline__lede {
  margin-top: 18px;
  max-width: 34em;
}

.page-about .about-pipeline__media {
  margin: 0;
  aspect-ratio: 3 / 2;
}

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

@media (min-width: 960px) {
  .page-about .about-pipeline__top {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    column-gap: clamp(40px, 6vw, 88px);
    align-items: center;
  }
}

.page-about .flow {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 3.4vw, 36px);
  counter-reset: flow;
}

.page-about .flow__step {
  position: relative;
  border-top: var(--about-rule);
  padding-top: clamp(16px, 2.2vw, 22px);
}

.page-about .flow__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--copper);
  margin-bottom: 10px;
}

.page-about .flow__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 800;
  color: var(--bone);
}

.page-about .flow__note {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--bone-soft);
}

.page-about .flow__arrow {
  display: none;
  color: var(--slate);
  overflow: visible;
}

@media (min-width: 900px) {
  .page-about .flow {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: clamp(20px, 3vw, 48px);
  }

  .page-about .flow__arrow {
    display: block;
    position: absolute;
    top: clamp(16px, 2.2vw, 22px);
    left: calc(100% + clamp(8px, 1.4vw, 20px));
    width: clamp(18px, 1.8vw, 30px);
    height: 10px;
  }

  .page-about .flow__step:last-child .flow__arrow {
    display: none;
  }
}

/* ---------- 05 地域根基 ---------- */

.page-about .about-region {
  padding: var(--about-pad) 0;
  background: linear-gradient(180deg, var(--ink-900) 0%, var(--wine-700) 18%, var(--wine-700) 82%, var(--ink-900) 100%);
}

.page-about .about-region__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(32px, 5vw, 72px);
}

.page-about .about-region__text {
  max-width: 42em;
}

.page-about .about-region__text p {
  margin: 18px 0 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--bone-soft);
  max-width: 36em;
}

.page-about .about-region__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 24px 20px;
  align-content: start;
}

.page-about .about-region__fact {
  border-top: 1px solid rgba(201, 160, 90, 0.42);
  padding-top: 14px;
  display: grid;
  gap: 6px;
  min-width: 0;
}

.page-about .about-region__fact-num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 4vw, 34px);
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  line-height: 1;
  color: var(--neon);
  letter-spacing: -0.02em;
}

.page-about .about-region__fact-unit {
  font-size: 0.45em;
  margin-left: 0.18em;
  color: var(--bone-soft);
}

.page-about .about-region__fact-label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--bone-soft);
}

@media (min-width: 900px) {
  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(0, 1fr);
    column-gap: clamp(48px, 7vw, 112px);
    align-items: start;
  }

  .page-about .about-region__facts {
    grid-template-columns: minmax(0, 1fr);
    gap: 28px;
    position: sticky;
    top: calc(var(--header-h) + 32px);
  }
}

/* ---------- 06 合作生态 ---------- */

.page-about .about-partners {
  padding: var(--about-pad) 0;
}

.page-about .about-partners__head {
  max-width: 40em;
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-quote {
  margin: 0 0 clamp(36px, 5vw, 64px);
  padding: 4px 0 4px clamp(18px, 2.6vw, 30px);
  border-left: 2px solid var(--copper);
  font-family: var(--font-serif);
  font-size: clamp(18px, 2.3vw, 25px);
  line-height: 1.7;
  color: var(--bone);
  max-width: 38em;
}

.page-about .about-partners__body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 44px);
  border-top: var(--about-rule);
  padding-top: clamp(28px, 4vw, 44px);
}

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

.page-about .about-partners__col-title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 800;
  color: var(--bone);
}

.page-about .about-partners__col p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: var(--bone-soft);
  max-width: 34em;
}

.page-about .about-partners__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 14px;
  margin-top: 20px;
}

@media (min-width: 860px) {
  .page-about .about-partners__body {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(28px, 3.6vw, 56px);
  }
}

/* ---------- 尾部视觉 ---------- */

.page-about .about-close {
  position: relative;
  margin-top: clamp(24px, 4vw, 56px);
  overflow: hidden;
}

.page-about .about-close__media {
  margin: 0;
  display: block;
}

.page-about .about-close__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 16 / 7;
  object-fit: cover;
  filter: saturate(0.82) brightness(0.82);
}

.page-about .about-close__ridge {
  display: block;
  width: 100%;
  height: clamp(80px, 11vw, 160px);
  color: var(--bone);
  opacity: 0.08;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-team__cols:hover .about-role,
  .page-about .track-node__num,
  .page-about .track-node__plus::before,
  .page-about .track-node__plus::after {
    transition: none;
  }

  .page-about .about-team__cols:hover .about-role {
    opacity: 1;
  }
}