.page-about {
  --about-edge: rgba(143, 163, 191, .2);
  --about-panel: linear-gradient(180deg, rgba(11, 18, 32, .9), rgba(7, 20, 38, .92));
  display: block;
}

.page-about .breadcrumb {
  margin: clamp(16px, 3vw, 26px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(26px, 5vw, 58px) 0 clamp(34px, 6vw, 74px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -12%;
  width: min(720px, 88vw);
  height: min(720px, 88vw);
  background: radial-gradient(circle at 50% 50%, rgba(42, 245, 176, .1), rgba(123, 97, 255, .09) 45%, transparent 72%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  gap: clamp(24px, 4vw, 46px);
}

.page-about .about-hero__body {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
  align-content: start;
}

.page-about .about-hero__eyebrow {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--gold);
}

.page-about .about-hero__title {
  margin: 0;
  font-size: clamp(32px, 6.6vw, 72px);
  font-weight: 800;
  line-height: 1.03;
  letter-spacing: -.02em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.6vw, 18px);
  line-height: 1.75;
  color: var(--haze);
}

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

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

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

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 9;
  object-fit: cover;
  border: 1px solid var(--about-edge);
  border-radius: 3px;
  box-shadow: var(--shadow-card);
}

@media (min-width: 960px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, .9fr);
    align-items: end;
    gap: clamp(28px, 4vw, 56px);
  }
}

/* ---------- 通用区块 ---------- */
.page-about .about-section {
  padding: clamp(38px, 7vw, 80px) 0;
  border-top: 1px solid var(--about-edge);
}

.page-about .section-head {
  margin-bottom: clamp(20px, 3vw, 32px);
}

.page-about .section-head__title {
  font-size: clamp(23px, 3.4vw, 40px);
  line-height: 1.16;
  letter-spacing: -.01em;
}

.page-about .section-head__note {
  max-width: 68ch;
}

/* ---------- 左侧刻度 + 右侧内容 ---------- */
.page-about .about-fold {
  display: grid;
  gap: 20px;
}

.page-about .about-fold__gauge {
  display: flex;
  align-items: center;
  gap: 14px;
}

.page-about .about-fold__tick {
  font-family: var(--font-mono);
  font-size: clamp(22px, 3vw, 30px);
  font-weight: 700;
  letter-spacing: .06em;
  color: var(--gold);
  line-height: 1;
}

.page-about .about-fold__line {
  flex: 1 1 auto;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), rgba(201, 162, 74, 0));
}

.page-about .about-fold__note {
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--haze);
  white-space: nowrap;
}

@media (min-width: 900px) {
  .page-about .about-fold {
    grid-template-columns: 108px minmax(0, 1fr);
    gap: clamp(28px, 4vw, 52px);
  }

  .page-about .about-fold__gauge {
    flex-direction: column;
    align-items: flex-start;
    gap: 12px;
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-fold__line {
    flex: none;
    width: 1px;
    height: 88px;
    background: linear-gradient(180deg, var(--gold), rgba(201, 162, 74, 0));
  }
}

.page-about .about-card {
  padding: clamp(20px, 3vw, 30px);
  border: 1px solid var(--about-edge);
  border-left: 2px solid var(--gold);
  border-radius: 3px;
  background: var(--about-panel);
  box-shadow: var(--shadow-card);
}

.page-about .about-card p {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--haze);
}

.page-about .about-card p + p {
  margin-top: 14px;
}

.page-about .about-card strong {
  color: var(--paper);
}

/* ---------- 服务范围 ---------- */
.page-about .about-scope {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-scope__item {
  position: relative;
  padding: 22px 22px 24px;
  border: 1px solid var(--about-edge);
  border-radius: 3px;
  background: var(--about-panel);
  box-shadow: var(--shadow-card);
  transition: transform .3s var(--ease), border-color .3s var(--ease);
}

.page-about .about-scope__item:hover {
  transform: translateY(-2px);
  border-color: rgba(42, 245, 176, .45);
}

.page-about .about-scope__no {
  display: block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-scope__name {
  margin: 0 0 10px;
  font-size: 19px;
  font-weight: 700;
  color: var(--paper);
}

.page-about .about-scope__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .about-scope__link {
  display: inline-block;
  margin-top: 14px;
  font-size: 14px;
  font-weight: 700;
  color: var(--lime);
  text-decoration: none;
  border-bottom: 1px solid rgba(42, 245, 176, .4);
  padding-bottom: 2px;
  transition: color .25s var(--ease), border-color .25s var(--ease);
}

.page-about .about-scope__link:hover,
.page-about .about-scope__link:focus-visible {
  color: var(--magenta);
  border-color: var(--magenta);
}

@media (min-width: 700px) {
  .page-about .about-scope {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (min-width: 1080px) {
  .page-about .about-scope {
    grid-template-columns: repeat(6, minmax(0, 1fr));
  }

  .page-about .about-scope__item {
    grid-column: span 3;
  }

  .page-about .about-scope__item:nth-child(3) {
    grid-column: span 2;
  }

  .page-about .about-scope__item:nth-child(4) {
    grid-column: span 2;
  }

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

/* ---------- 整理节奏 ---------- */
.page-about .about-cadence {
  display: grid;
  gap: clamp(20px, 3.4vw, 36px);
}

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

.page-about .about-cadence__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-edge);
  border-radius: 3px;
  box-shadow: var(--shadow-card);
}

.page-about .about-cadence__body p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--haze);
}

.page-about .about-cadence__note {
  margin: 18px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--violet);
  font-size: 14px;
  line-height: 1.75;
  color: var(--haze);
}

.page-about .about-metrics {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(130px, 1fr));
  gap: 1px;
  background: var(--steel);
  border: 1px solid var(--steel);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .about-metric {
  display: grid;
  gap: 6px;
  padding: 18px 16px;
  background: var(--ink-carbon);
}

.page-about .about-metric__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 3.4vw, 36px);
  font-weight: 700;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-metric__label {
  font-size: 13px;
  line-height: 1.5;
  color: var(--haze);
}

@media (min-width: 900px) {
  .page-about .about-cadence {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: center;
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
}

.page-about .about-team__intro p {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--haze);
}

.page-about .about-roles {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-edge);
  border: 1px solid var(--about-edge);
  border-radius: 3px;
  overflow: hidden;
}

.page-about .about-roles__item {
  display: grid;
  gap: 8px;
  padding: 20px;
  background: var(--ink-carbon);
  border-left: 2px solid transparent;
  transition: border-color .3s var(--ease), background-color .3s var(--ease);
}

.page-about .about-roles__item:hover {
  border-left-color: var(--gold);
  background: #0e1728;
}

.page-about .about-roles__name {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .12em;
  color: var(--paper);
}

.page-about .about-roles__desc {
  font-size: 14px;
  line-height: 1.75;
  color: var(--haze);
}

@media (min-width: 700px) {
  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 1080px) {
  .page-about .about-team {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
    align-items: start;
    gap: clamp(28px, 4vw, 56px);
  }

  .page-about .about-team__intro {
    position: sticky;
    top: 96px;
  }
}

/* ---------- 里程碑时间轴 ---------- */
.page-about .about-timeline {
  position: relative;
  margin: 0;
  padding: 0 0 0 24px;
  border-left: 1px solid var(--steel);
  display: grid;
  gap: 12px;
}

.page-about .about-milestone {
  position: relative;
  border: 1px solid var(--about-edge);
  border-radius: 3px;
  background: var(--about-panel);
  box-shadow: var(--shadow-card);
}

.page-about .about-milestone::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 26px;
  width: 8px;
  height: 8px;
  transform: translateX(-50%);
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 74, .14);
}

.page-about .about-milestone[open]::before {
  background: var(--lime);
  box-shadow: 0 0 0 3px rgba(42, 245, 176, .14);
}

.page-about .about-milestone__sum {
  position: relative;
  display: grid;
  gap: 6px;
  padding: 18px 44px 18px 20px;
  cursor: pointer;
  list-style: none;
}

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

.page-about .about-milestone__sum::after {
  content: "+";
  position: absolute;
  top: 15px;
  right: 18px;
  font-family: var(--font-mono);
  font-size: 18px;
  line-height: 1;
  color: var(--lime);
}

.page-about .about-milestone[open] .about-milestone__sum::after {
  content: "–";
}

.page-about .about-milestone__era {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--gold);
}

.page-about .about-milestone__title {
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--paper);
}

.page-about .about-milestone__body {
  padding: 0 20px 20px;
  border-top: 1px solid var(--about-edge);
  margin-top: 2px;
}

.page-about .about-milestone__body p {
  margin: 14px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--haze);
}

.page-about .about-milestone__sum:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: 2px;
}

@media (min-width: 900px) {
  .page-about .about-timeline {
    padding-left: 34px;
    gap: 14px;
  }

  .page-about .about-milestone::before {
    left: -34px;
  }
}

/* ---------- 服务地区 ---------- */
.page-about .about-region {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
}

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

.page-about .about-region__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--about-edge);
  border-radius: 3px;
  box-shadow: var(--shadow-card);
}

.page-about .about-region__body p {
  margin: 0 0 20px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--haze);
}

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

@media (min-width: 900px) {
  .page-about .about-region {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-region .section-head {
    margin-bottom: 18px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-scope__item,
  .page-about .about-roles__item,
  .page-about .about-scope__link {
    transition: none;
  }

  .page-about .about-scope__item:hover,
  .page-about .about-roles__item:hover {
    transform: none;
  }
}