.page-about {
  --about-toc-w: 216px;
  --about-pad: clamp(22px, 4vw, 44px);
  background-color: var(--pearl);
  color: var(--ink);
  overflow-x: clip;
}

/* ============ 首屏 ============ */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: clamp(22px, 4vw, 46px) 0 clamp(46px, 7vw, 100px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -36%;
  right: -20%;
  width: min(760px, 82%);
  height: 158%;
  z-index: -1;
  border-radius: 46% 54% 38% 62% / 58% 42% 56% 44%;
  background: radial-gradient(circle at 32% 32%, rgba(255, 107, 74, .92), rgba(242, 169, 59, .34) 56%, rgba(255, 107, 74, 0) 74%);
  transform: rotate(-13deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -14%;
  bottom: -34%;
  width: min(600px, 66%);
  height: 84%;
  z-index: -1;
  border-radius: 60% 40% 52% 48% / 44% 58% 42% 56%;
  background: radial-gradient(circle at 58% 58%, rgba(31, 138, 112, .78), rgba(79, 179, 191, 0) 72%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  margin-top: clamp(20px, 3.5vw, 40px);
}

.page-about .about-hero__kicker {
  color: var(--lagoon);
}

.page-about .about-hero__title {
  margin: 12px 0 18px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(40px, 7.2vw, 86px);
  line-height: 1;
  letter-spacing: -0.035em;
  color: var(--pearl);
  max-width: 16ch;
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 48ch;
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.85;
  color: rgba(250, 247, 240, .82);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(22px, 3vw, 32px);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border-radius: var(--radius-lg);
  overflow: hidden;
  background: rgba(250, 247, 240, .16);
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  background: rgba(11, 44, 74, .62);
}

.page-about .about-hero__stat b {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3.2vw, 32px);
  line-height: 1.1;
  letter-spacing: -0.02em;
  color: var(--pearl);
}

.page-about .about-hero__stat span {
  font-size: var(--step-12);
  letter-spacing: .06em;
  color: rgba(250, 247, 240, .7);
}

.page-about .about-hero__stat--coral b {
  color: var(--coral);
}

/* ============ 主体两栏 ============ */
.page-about .about-main {
  padding: clamp(30px, 5vw, 72px) 0 clamp(44px, 7vw, 96px);
}

.page-about .about-main__inner {
  display: grid;
  gap: clamp(22px, 3.5vw, 52px);
  align-items: start;
}

/* ============ 章节索引 ============ */
.page-about .about-toc__title {
  display: none;
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--lagoon);
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 8px;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-toc__link {
  display: inline-flex;
  align-items: baseline;
  gap: 6px;
  white-space: nowrap;
  padding: 9px 16px;
  border-radius: var(--radius-pill);
  background: rgba(11, 44, 74, .06);
  color: var(--deep-blue);
  font-family: var(--font-mono);
  font-size: var(--step-12);
  text-decoration: none;
  transition: background-color .22s var(--ease-out), color .22s var(--ease-out), border-color .22s var(--ease-out);
}

.page-about .about-toc__link:hover,
.page-about .about-toc__link:focus-visible {
  background: var(--deep-blue);
  color: var(--pearl);
}

/* ============ 章节 ============ */
.page-about .about-chapter {
  scroll-margin-top: 84px;
  padding: var(--about-pad);
  border-radius: var(--radius-lg);
  margin-bottom: clamp(18px, 2.6vw, 28px);
}

.page-about .about-chapter:last-child {
  margin-bottom: 0;
}

.page-about .about-chapter--sand {
  background: var(--sand);
}

.page-about .about-chapter--plain {
  background: #fff;
  border: 1px solid var(--mist);
}

.page-about .about-chapter--mist {
  background: var(--mist);
}

.page-about .about-chapter--indigo {
  background: var(--indigo);
  color: var(--pearl);
}

.page-about .about-chapter--indigo .section-head__index {
  color: var(--coral);
}

.page-about .about-chapter--indigo .section-head__title {
  color: var(--pearl);
}

.page-about .about-chapter--indigo .section-head__note {
  color: rgba(250, 247, 240, .74);
}

.page-about .about-chapter--indigo .prose p {
  color: rgba(250, 247, 240, .86);
}

.page-about .about-chapter--indigo .about-inline-link {
  color: rgba(250, 247, 240, .82);
}

.page-about .about-chapter--indigo .about-inline-link a {
  color: var(--lagoon);
}

/* 章节内分栏 */
.page-about .about-split {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin-top: clamp(18px, 2.5vw, 28px);
}

.page-about .about-inline-link {
  margin: clamp(20px, 3vw, 30px) 0 0;
  font-size: var(--step-16);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-inline-link a {
  color: var(--deep-blue);
  text-decoration-color: var(--coral);
  text-underline-offset: 4px;
}

/* ============ 发展时间线 ============ */
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: clamp(24px, 3.5vw, 38px) 0 0;
  padding: 0 0 0 26px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--coral), var(--lagoon) 52%, var(--palm));
}

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

.page-about .about-timeline__item + .about-timeline__item {
  margin-top: 12px;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 18px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--pearl);
  box-shadow: 0 0 0 2px var(--coral);
}

.page-about .about-timeline__node summary {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 12px;
  padding: 10px 18px;
  border-radius: var(--radius-md);
  background: rgba(11, 44, 74, .05);
  cursor: pointer;
  list-style: none;
  transition: background-color .2s var(--ease-out);
}

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

.page-about .about-timeline__node summary:hover {
  background: rgba(11, 44, 74, .1);
}

.page-about .about-timeline__node[open] summary {
  background: rgba(255, 107, 74, .14);
}

.page-about .about-timeline__stage {
  color: var(--palm);
}

.page-about .about-timeline__name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-20);
  color: var(--ink);
}

.page-about .about-timeline__node p {
  margin: 10px 4px 0;
  font-size: var(--step-16);
  line-height: 1.85;
  color: rgba(7, 26, 43, .78);
}

/* ============ 评分条 ============ */
.page-about .about-score {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 20px;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 18px 22px;
  border-radius: var(--radius-lg);
  background: rgba(242, 169, 59, .14);
}

.page-about .about-score__label {
  color: var(--deep-blue);
}

.page-about .about-score__hint {
  font-size: var(--step-14);
  color: rgba(7, 26, 43, .62);
}

/* ============ 师傅核验标签页 ============ */
.page-about .about-verify {
  margin-top: clamp(24px, 3.5vw, 36px);
}

.page-about .about-verify__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 18px;
}

.page-about .about-verify .segmented__tab {
  padding: 10px 20px;
  border-radius: var(--radius-pill);
  border: 1px solid var(--mist);
  background: transparent;
  color: var(--deep-blue);
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: .04em;
  cursor: pointer;
  transition: background-color .2s var(--ease-out), color .2s var(--ease-out), border-color .2s var(--ease-out);
}

.page-about .about-verify .segmented__tab:hover {
  border-color: var(--deep-blue);
}

.page-about .about-verify .segmented__tab[aria-selected="true"] {
  background: var(--deep-blue);
  border-color: var(--deep-blue);
  color: var(--pearl);
}

.page-about .about-panel {
  padding: clamp(18px, 3vw, 28px);
  border-radius: var(--radius-lg);
  background: var(--pearl);
  border: 1px solid var(--mist);
}

.page-about .about-panel__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-20);
  color: var(--ink);
}

.page-about .about-panel p {
  margin: 0;
  font-size: var(--step-16);
  line-height: 1.85;
  color: rgba(7, 26, 43, .8);
}

/* ============ 调度指标 ============ */
.page-about .about-metrics {
  list-style: none;
  margin: clamp(24px, 3.5vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: 12px;
}

.page-about .about-metric {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 18px;
  border-radius: var(--radius-lg);
  background: rgba(250, 247, 240, .08);
  border: 1px solid rgba(250, 247, 240, .16);
}

.page-about .about-metric b {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(20px, 2.4vw, 26px);
  letter-spacing: -0.01em;
  color: var(--amber);
}

.page-about .about-metric span {
  font-size: var(--step-14);
  color: rgba(250, 247, 240, .74);
}

/* ============ 回访步骤 ============ */
.page-about .about-loop {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-loop__step {
  position: relative;
  padding: 18px 20px 18px 22px;
  border-radius: var(--radius-lg);
  background: var(--pearl);
  border-left: 3px solid var(--lagoon);
}

.page-about .about-loop__step:nth-child(2) {
  border-left-color: var(--palm);
}

.page-about .about-loop__step:nth-child(3) {
  border-left-color: var(--amber);
}

.page-about .about-loop__step:nth-child(4) {
  border-left-color: var(--coral);
}

.page-about .about-loop__num {
  color: var(--deep-blue);
}

.page-about .about-loop__title {
  margin: 6px 0 8px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: var(--step-20);
  color: var(--ink);
}

.page-about .about-loop__step p {
  margin: 0;
  font-size: var(--step-16);
  line-height: 1.8;
  color: rgba(7, 26, 43, .76);
}

/* ============ 覆盖城市 ============ */
.page-about .about-coverage__lede {
  margin-top: clamp(18px, 2.5vw, 26px);
  max-width: 62ch;
}

.page-about .about-cities {
  list-style: none;
  margin: clamp(22px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(190px, 1fr));
  gap: 12px;
}

.page-about .about-cities__item {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 20px;
  border-radius: var(--radius-lg);
  background: rgba(255, 255, 255, .72);
}

.page-about .about-cities__item--hub {
  background: var(--deep-blue);
}

.page-about .about-cities__item--hub .about-cities__name,
.page-about .about-cities__item--hub .about-cities__time,
.page-about .about-cities__item--hub .about-cities__tag {
  color: var(--pearl);
}

.page-about .about-cities__item--hub .about-cities__time {
  color: var(--amber);
}

.page-about .about-cities__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--step-20);
  color: var(--ink);
}

.page-about .about-cities__time {
  font-family: var(--font-mono);
  font-size: var(--step-12);
  letter-spacing: .06em;
  color: var(--deep-blue);
}

.page-about .about-cities__tag {
  font-size: var(--step-14);
  color: rgba(7, 26, 43, .6);
}

.page-about .note-margin {
  margin-top: clamp(22px, 3vw, 32px);
  max-width: 64ch;
  font-size: var(--step-16);
  line-height: 1.85;
  color: rgba(7, 26, 43, .78);
}

/* ============ 结尾行动区 ============ */
.page-about .about-cta {
  padding: clamp(46px, 6vw, 88px) 0 clamp(50px, 7vw, 96px);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 40px);
  align-items: center;
}

.page-about .about-cta__inner .mono-label {
  color: var(--lagoon);
}

.page-about .about-cta__title {
  margin: 10px 0 14px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(30px, 4.4vw, 54px);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--pearl);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 46ch;
  font-size: var(--step-16);
  line-height: 1.85;
  color: rgba(250, 247, 240, .8);
}

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

/* ============ 响应式 ============ */
@media (min-width: 720px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    align-items: start;
  }

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

@media (min-width: 1024px) {
  .page-about .about-main__inner {
    grid-template-columns: var(--about-toc-w) minmax(0, 1fr);
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-toc {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-toc__title {
    display: block;
  }

  .page-about .about-toc__list {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding: 0;
  }

  .page-about .about-toc__link {
    width: 100%;
    border-radius: 0;
    background: none;
    padding: 9px 0 9px 16px;
    border-left: 2px solid var(--mist);
    color: rgba(7, 26, 43, .6);
    white-space: normal;
    font-size: var(--step-12);
    line-height: 1.5;
  }

  .page-about .about-toc__link:hover,
  .page-about .about-toc__link:focus-visible {
    background: none;
    color: var(--deep-blue);
    border-left-color: var(--coral);
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
  }

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

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: stretch;
    min-width: 230px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-toc__link,
  .page-about .about-verify .segmented__tab,
  .page-about .about-timeline__node summary {
    transition: none;
  }
}