.page-about {
  --about-pad: clamp(16px, 3vw, 32px);
  --about-rule: 1px solid var(--sd-line);
  display: block;
  overflow-x: clip;
  background: var(--sd-night);
  color: var(--sd-mist);
}

/* ---------- 01 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 56px) 0 clamp(36px, 6vw, 80px);
  background:
    radial-gradient(110% 80% at 88% -8%, rgba(53, 214, 232, .16), transparent 62%),
    radial-gradient(80% 90% at -6% 106%, rgba(255, 106, 26, .14), transparent 60%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--sd-orange), var(--sd-gold) 42%, var(--sd-lime) 78%, transparent);
  opacity: .55;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(28px, 4vw, 56px);
  margin-top: clamp(20px, 4vw, 40px);
}

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

.page-about .about-hero__lead .sd-display {
  margin: 0 0 clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero__lead .sd-lead {
  max-width: 62ch;
  margin: 0;
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--sd-line);
  border: var(--about-rule);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--sd-cut)), calc(100% - var(--sd-cut)) 100%, 0 100%);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  min-width: 0;
  padding: clamp(14px, 2.4vw, 22px);
  background: var(--sd-room);
}

.page-about .about-fact__num {
  font-family: var(--sd-mono);
  font-weight: 600;
  font-size: clamp(26px, 3.6vw, 38px);
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--sd-orange);
}

.page-about .about-fact__label {
  font-family: var(--sd-mono);
  font-size: 11px;
  letter-spacing: .18em;
  color: var(--sd-index);
  text-transform: uppercase;
}

@media (min-width: 980px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.6fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 02 发展历程 ---------- */
.page-about .about-history__intro {
  max-width: 58ch;
  margin: 0 0 clamp(24px, 4vw, 44px);
}

.page-about .about-history__layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 40px);
}

.page-about .about-scale {
  display: flex;
  gap: 18px;
  padding: 0 0 12px;
  overflow-x: auto;
  border-bottom: var(--about-rule);
  scrollbar-width: none;
}

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

.page-about .about-scale__item {
  position: relative;
  flex: 0 0 auto;
  padding-left: 14px;
  font-family: var(--sd-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--sd-index);
  white-space: nowrap;
}

.page-about .about-scale__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 50%;
  width: 7px;
  height: 7px;
  margin-top: -3.5px;
  background: var(--sd-orange);
  transform: rotate(45deg);
}

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

.page-about .about-history__tabs .sd-tabs__list {
  display: flex;
  gap: 0;
  overflow-x: auto;
  border-bottom: var(--about-rule);
  scrollbar-width: none;
}

.page-about .about-history__tabs .sd-tabs__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-history__tabs .sd-tab {
  flex: 0 0 auto;
  font-family: var(--sd-mono);
  font-size: 13px;
  letter-spacing: .06em;
  white-space: nowrap;
}

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

.page-about .about-timeline__item {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 8px;
  padding: clamp(16px, 2.4vw, 24px) 0;
  border-bottom: var(--about-rule);
}

.page-about .about-timeline__item:first-child {
  padding-top: clamp(18px, 2.6vw, 28px);
}

.page-about .about-timeline__time {
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .1em;
  color: var(--sd-gold);
}

.page-about .about-timeline__item .sd-h3 {
  margin: 0 0 6px;
}

.page-about .about-timeline__item .sd-text {
  margin: 0;
  max-width: 60ch;
}

@media (min-width: 980px) {
  .page-about .about-history__layout {
    grid-template-columns: 132px minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-scale {
    position: sticky;
    top: calc(var(--sd-header-h) + 28px);
    flex-direction: column;
    gap: 0;
    padding: 0 0 0 clamp(14px, 1.6vw, 22px);
    overflow: visible;
    border-bottom: 0;
    border-left: var(--about-rule);
  }

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

  .page-about .about-scale__item::before {
    left: calc(-1 * clamp(14px, 1.6vw, 22px) - 4px);
  }

  .page-about .about-timeline__item {
    grid-template-columns: 88px minmax(0, 1fr);
    gap: clamp(16px, 3vw, 32px);
    align-items: start;
  }

  .page-about .about-timeline__time {
    padding-top: 4px;
  }
}

/* ---------- 03 业务分工 ---------- */
.page-about .about-tracks__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  margin-top: clamp(24px, 4vw, 48px);
}

.page-about .about-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 14px;
  min-width: 0;
  padding: clamp(20px, 3vw, 34px) clamp(18px, 2.6vw, 32px);
  background: var(--sd-room);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - var(--sd-cut)), calc(100% - var(--sd-cut)) 100%, 0 100%);
}

.page-about .about-track::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
}

.page-about .about-track--data::before {
  background: var(--sd-orange);
}

.page-about .about-track--life::before {
  background: var(--sd-cyan);
}

.page-about .about-track__head {
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-track__head .sd-index {
  color: var(--sd-index);
}

.page-about .about-track__head .sd-h3 {
  margin: 0;
}

.page-about .about-track .sd-text {
  margin: 0;
}

.page-about .about-track__list {
  display: grid;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-track__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--sd-mist);
}

.page-about .about-track__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 8px;
  height: 2px;
  background: var(--sd-lime);
}

.page-about .about-track--life .about-track__list li::before {
  background: var(--sd-gold);
}

.page-about .about-track__link {
  margin-top: auto;
  align-self: flex-start;
  padding-top: 6px;
}

.page-about .about-tracks__chart {
  margin: clamp(28px, 4vw, 48px) 0 0;
}

.page-about .about-tracks__chart svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 900px;
}

.page-about .about-chart__grid line {
  stroke: var(--sd-line);
  stroke-width: 1;
}

.page-about .about-chart__rail {
  stroke: var(--sd-line-strong);
  stroke-width: 1;
}

.page-about .about-chart__line {
  fill: none;
  stroke-width: 3;
  stroke-linecap: round;
}

.page-about .about-chart__line--data {
  stroke: var(--sd-orange);
}

.page-about .about-chart__line--life {
  stroke: var(--sd-cyan);
}

.page-about .about-chart__dot--data {
  fill: var(--sd-orange);
}

.page-about .about-chart__dot--life {
  fill: var(--sd-cyan);
}

.page-about .about-chart__tick {
  font-family: var(--sd-mono);
  font-size: 11px;
  letter-spacing: .06em;
  fill: var(--sd-index);
}

.page-about .about-chart__tick--data {
  fill: var(--sd-orange);
}

.page-about .about-chart__tick--life {
  fill: var(--sd-cyan);
}

@media (min-width: 900px) {
  .page-about .about-tracks__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 04 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(24px, 4vw, 44px);
}

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

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

.page-about .about-team__body > .sd-text {
  margin: 0 0 clamp(20px, 3vw, 32px);
  max-width: 58ch;
}

.page-about .about-roles {
  display: grid;
  gap: clamp(16px, 2.4vw, 24px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  display: grid;
  gap: 8px;
}

.page-about .about-role__head {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-role__name {
  font-size: 16px;
  font-weight: 500;
  color: var(--sd-mist);
}

.page-about .about-role__num {
  font-family: var(--sd-mono);
  font-size: 20px;
  font-weight: 600;
  color: var(--sd-gold);
}

.page-about .about-role__bar {
  position: relative;
  height: 6px;
  background: rgba(147, 162, 188, .16);
  overflow: hidden;
}

.page-about .about-role__fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--sd-orange), var(--sd-gold));
}

.page-about .about-role__fill--a {
  width: 100%;
}

.page-about .about-role__fill--b {
  width: 52%;
  background: linear-gradient(90deg, var(--sd-cyan), var(--sd-lime));
}

.page-about .about-role__fill--c {
  width: 76%;
  background: linear-gradient(90deg, var(--sd-gold), var(--sd-lime));
}

.page-about .about-role__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--sd-index);
}

@media (min-width: 980px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: calc(var(--sd-header-h) + 28px);
  }
}

/* ---------- 05 服务指标 ---------- */
.page-about .about-metrics__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  margin: clamp(24px, 4vw, 44px) 0 clamp(20px, 3vw, 28px);
  padding: 0;
  list-style: none;
  background: var(--sd-line);
  border-top: var(--about-rule);
  border-bottom: var(--about-rule);
}

.page-about .about-metric {
  display: grid;
  grid-template-columns: auto auto minmax(0, 1fr);
  align-items: baseline;
  gap: 0 8px;
  padding: clamp(18px, 2.8vw, 28px) clamp(4px, 1vw, 12px);
  background: var(--sd-night);
}

.page-about .about-metric__k {
  font-family: var(--sd-mono);
  font-size: clamp(34px, 5vw, 56px);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.03em;
  color: var(--sd-orange);
}

.page-about .about-metric__u {
  font-family: var(--sd-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--sd-gold);
}

.page-about .about-metric__d {
  grid-column: 1 / -1;
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--sd-index);
}

.page-about .about-metrics .sd-note {
  margin: 0;
  max-width: 62ch;
}

@media (min-width: 900px) {
  .page-about .about-metrics__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .about-metric__d {
    grid-column: 3;
    margin: 6px 0 0;
  }
}

/* ---------- 06 合作生态 ---------- */
.page-about .about-partners__list {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 32px);
  margin: clamp(24px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-partner {
  display: grid;
  grid-template-columns: 64px minmax(0, 1fr);
  gap: clamp(14px, 2.4vw, 26px);
  align-items: start;
  padding-top: clamp(18px, 2.6vw, 26px);
  border-top: var(--about-rule);
}

.page-about .about-partner__num {
  font-family: var(--sd-mono);
  font-size: clamp(30px, 4vw, 44px);
  font-weight: 600;
  line-height: .95;
  letter-spacing: -.03em;
  color: var(--sd-lime);
}

.page-about .about-partner .sd-h3 {
  margin: 0 0 8px;
}

.page-about .about-partner .sd-text {
  margin: 0;
  max-width: 62ch;
}

@media (min-width: 900px) {
  .page-about .about-partners__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-partner {
    grid-template-columns: minmax(0, 1fr);
    gap: 14px;
  }
}

/* ---------- 07 服务地区与备案 ---------- */
.page-about .about-region__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 36px);
}

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

.page-about .about-region__text .sd-h2 {
  margin: 0 0 clamp(14px, 2vw, 22px);
}

.page-about .about-region__text > .sd-text {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 56ch;
}

.page-about .about-region__meta {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 0;
  margin: 0 0 clamp(18px, 2.6vw, 26px);
  border-top: var(--about-rule);
}

.page-about .about-region__meta > div {
  display: grid;
  grid-template-columns: 96px minmax(0, 1fr);
  gap: 12px;
  padding: 12px 0;
  border-bottom: var(--about-rule);
}

.page-about .about-region__meta dt {
  font-family: var(--sd-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--sd-index);
  text-transform: uppercase;
}

.page-about .about-region__meta dd {
  margin: 0;
  font-size: 15px;
  line-height: 1.6;
  color: var(--sd-mist);
  overflow-wrap: anywhere;
}

.page-about .about-region__meta .sd-mono {
  color: var(--sd-gold);
}

.page-about .about-region__text .sd-note {
  max-width: 56ch;
  margin: 0;
}

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

@media (min-width: 980px) {
  .page-about .about-region__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.15fr);
    align-items: start;
  }
}

/* ---------- 08 收束 ---------- */
.page-about .about-outro {
  padding-bottom: clamp(48px, 8vw, 110px);
}

.page-about .about-outro__panel {
  position: relative;
  padding: clamp(28px, 4vw, 56px) clamp(20px, 3.4vw, 52px);
  background:
    linear-gradient(115deg, rgba(255, 106, 26, .18) 0%, rgba(11, 27, 52, 0) 46%),
    var(--sd-room);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 28px), calc(100% - 28px) 100%, 0 100%);
  overflow: hidden;
}

.page-about .about-outro__panel::before {
  content: "";
  position: absolute;
  right: -60px;
  top: -40px;
  width: 260px;
  height: 260px;
  background: radial-gradient(circle, rgba(182, 255, 60, .18), transparent 68%);
  pointer-events: none;
}

.page-about .about-outro__panel > .sd-eyebrow {
  margin: 0 0 12px;
}

.page-about .about-outro__panel .sd-h2 {
  margin: 0 0 clamp(12px, 2vw, 20px);
}

.page-about .about-outro__panel .sd-text {
  margin: 0 0 clamp(20px, 3vw, 30px);
  max-width: 62ch;
}

.page-about .about-outro__panel .sd-actions {
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 动效 ---------- */
@media (prefers-reduced-motion: no-preference) {
  .page-about [data-reveal] {
    opacity: 0;
    transform: translateY(8px);
    transition: opacity .5s var(--sd-ease), transform .5s var(--sd-ease);
  }

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

/* ---------- 窄屏收敛 ---------- */
@media (max-width: 560px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .about-region__meta > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

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