.page-about {
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

.page-about .ab-crumb {
  padding-top: 22px;
}

/* ---------- 首屏 ---------- */

.page-about .ab-hero {
  padding: 28px 0 0;
}

.page-about .ab-hero__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  align-items: end;
}

.page-about .ab-hero__eyebrow {
  font-family: var(--font-mono);
  letter-spacing: 0.2em;
  color: var(--gray);
  margin: 0;
}

.page-about .ab-hero__title {
  font-size: clamp(2.5rem, 10vw, 5rem);
  line-height: 0.98;
  letter-spacing: -0.02em;
  font-weight: 900;
  margin: 14px 0 0;
  max-width: 13ch;
}

.page-about .ab-hero__lede {
  font-size: 1.0625rem;
  line-height: 1.75;
  margin: 22px 0 0;
  max-width: 34em;
}

.page-about .ab-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
  margin-top: 28px;
}

.page-about .ab-hero__link {
  color: var(--ink);
  font-weight: 700;
  text-decoration: none;
  border-bottom: 3px solid var(--green);
  padding-bottom: 3px;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .ab-hero__link:hover {
  color: var(--orange);
  border-color: var(--orange);
}

.page-about .ab-hero__media {
  margin: 0;
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
  background: var(--ink);
}

.page-about .ab-hero__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .ab-stats {
  list-style: none;
  margin: 40px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 3px solid var(--ink);
  border-top: 6px solid var(--green);
}

.page-about .ab-stats__item {
  background: var(--white);
  padding: 16px 14px 18px;
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .ab-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.6rem, 6vw, 2.4rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

.page-about .ab-stats__label {
  font-size: 0.8125rem;
  line-height: 1.4;
  color: var(--gray);
}

/* ---------- 绿色斜切横幅 ---------- */

.page-about .ab-band-wrap {
  margin: 64px 0 0;
}

.page-about .ab-band {
  background: var(--green);
  color: var(--ink);
  padding: 44px 0 52px;
  clip-path: polygon(0 2.5%, 100% 0, 100% 97.5%, 0 100%);
}

.page-about .ab-band__inner {
  display: flex;
  flex-direction: column;
  gap: 20px;
}

.page-about .ab-band__text {
  font-size: clamp(1.15rem, 4vw, 1.6rem);
  font-weight: 900;
  line-height: 1.35;
  margin: 0;
  max-width: 24em;
}

.page-about .ab-band__facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px 28px;
  font-size: 0.9375rem;
  font-weight: 700;
}

.page-about .ab-band__facts li {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
}

.page-about .ab-band__facts .lq-num {
  font-family: var(--font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  letter-spacing: -0.03em;
}

/* ---------- 分屏主体 ---------- */

.page-about .ab-body {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 28px;
  padding-top: 56px;
  padding-bottom: 96px;
}

.page-about .ab-rail {
  position: relative;
  border: 3px solid var(--ink);
  background: var(--white);
  padding: 12px;
  box-shadow: var(--shadow-soft);
}

.page-about .ab-rail__anno {
  display: none;
}

.page-about .ab-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .ab-rail__item {
  flex: 0 0 auto;
}

.page-about .ab-rail__link {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 10px;
  text-decoration: none;
  color: var(--ink);
  border: 2px solid transparent;
  font-size: 0.9375rem;
  font-weight: 700;
  transition: background var(--ease), color var(--ease), border-color var(--ease);
}

.page-about .ab-rail__link:hover {
  border-color: var(--ink);
  background: var(--green-soft);
}

.page-about .ab-rail__link[aria-current="true"] {
  background: var(--ink);
  color: var(--paper);
  border-color: var(--ink);
}

.page-about .ab-rail__num {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.04em;
  opacity: 0.7;
}

/* ---------- 章节 ---------- */

.page-about .ab-flow {
  min-width: 0;
}

.page-about .ab-chapter {
  padding-bottom: 64px;
  border-bottom: 2px solid rgba(11, 14, 17, 0.12);
}

.page-about .ab-chapter + .ab-chapter {
  margin-top: 64px;
}

.page-about .ab-chapter__title {
  font-size: clamp(1.6rem, 6.5vw, 2.5rem);
  line-height: 1.15;
  letter-spacing: -0.01em;
  font-weight: 900;
  margin: 0 0 20px;
  max-width: 20ch;
}

.page-about .ab-chapter__lead {
  font-size: 1.0625rem;
  line-height: 1.75;
  font-weight: 700;
  margin: 0 0 18px;
  max-width: 36em;
}

.page-about .ab-chapter p {
  font-size: 1rem;
  line-height: 1.75;
  margin: 0 0 16px;
  max-width: 38em;
}

.page-about .ab-chapter__note {
  margin-top: 26px;
  padding: 18px 20px;
  border-left: 6px solid var(--green);
  background: var(--white);
  border-top: 2px solid var(--ink);
  border-right: 2px solid var(--ink);
  border-bottom: 2px solid var(--ink);
  font-size: 0.9375rem !important;
  line-height: 1.7 !important;
}

.page-about .ab-quote {
  margin: 28px 0 0;
  padding: 22px 24px;
  background: var(--white);
  border: 3px solid var(--ink);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-quote p {
  margin: 0;
  font-size: clamp(1.05rem, 4vw, 1.3rem);
  font-weight: 900;
  line-height: 1.45;
  max-width: 22em;
}

.page-about .ab-sub {
  font-size: 1.125rem;
  font-weight: 900;
  margin: 34px 0 14px;
}

/* ---------- 图片 ---------- */

.page-about .ab-figure {
  margin: 0;
  border: 3px solid var(--ink);
  background: var(--ink);
  overflow: hidden;
}

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

.page-about .ab-figure--band {
  margin: 0 0 28px;
}

/* ---------- 时间轴 ---------- */

.page-about .ab-tl {
  border-top: 3px solid var(--ink);
}

.page-about .ab-tl .lq-accordion__item {
  border-bottom: 2px solid var(--ink);
}

.page-about .ab-tl .lq-accordion__trigger {
  display: flex;
  align-items: baseline;
  gap: 16px;
  width: 100%;
  padding: 16px 4px;
  background: transparent;
  border: 0;
  cursor: pointer;
  color: inherit;
  font: inherit;
  text-align: left;
  transition: background var(--ease), padding-left var(--ease);
}

.page-about .ab-tl .lq-accordion__trigger:hover {
  background: var(--green-soft);
  padding-left: 10px;
}

.page-about .ab-tl .lq-accordion__trigger:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.page-about .ab-tl .lq-accordion__trigger[aria-expanded="true"] {
  background: var(--ink);
  color: var(--paper);
  padding-left: 10px;
}

.page-about .ab-tl__year {
  font-family: var(--font-mono);
  font-size: 1.125rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  flex: 0 0 auto;
}

.page-about .ab-tl__label {
  font-size: 0.9375rem;
  font-weight: 700;
  line-height: 1.5;
}

.page-about .ab-tl .lq-accordion__inner {
  padding: 4px 4px 18px 0;
}

.page-about .ab-tl .lq-accordion__inner p {
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--gray);
  margin: 0;
  max-width: 36em;
}

/* ---------- 三条线索 ---------- */

.page-about .ab-paths {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin: 24px 0 0;
}

.page-about .ab-path {
  border: 3px solid var(--ink);
  padding: 22px 22px 24px;
}

.page-about .ab-path__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 9vw, 3rem);
  font-weight: 700;
  letter-spacing: -0.03em;
  line-height: 1;
}

.page-about .ab-path__title {
  font-size: 1.0625rem;
  font-weight: 900;
  margin: 12px 0 10px;
}

.page-about .ab-path p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 30em;
}

.page-about .ab-path--paper {
  background: var(--white);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-path--ink {
  background: var(--ink);
  color: var(--paper);
}

.page-about .ab-path--ink p {
  color: rgba(247, 247, 244, 0.78);
}

.page-about .ab-path--ink .ab-path__num {
  color: var(--green);
}

.page-about .ab-path--green {
  background: var(--green-soft);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-path--green .ab-path__num {
  color: var(--ink);
}

/* ---------- 团队 ---------- */

.page-about .ab-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  margin-top: 26px;
}

.page-about .ab-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 3px solid var(--ink);
}

.page-about .ab-facts__item {
  padding: 14px 0;
  border-bottom: 2px solid rgba(11, 14, 17, 0.14);
}

.page-about .ab-facts__key {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.16em;
  color: var(--gray);
}

.page-about .ab-facts__val {
  display: block;
  font-size: 0.9375rem;
  line-height: 1.65;
  margin-top: 4px;
}

/* ---------- 服务网络 ---------- */

.page-about .ab-prov__list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .ab-prov {
  position: relative;
  border: 2px solid var(--ink);
  background: var(--white);
  padding: 8px 14px;
  font-size: 0.9375rem;
  font-weight: 900;
  cursor: default;
  transition: background var(--ease), color var(--ease);
}

.page-about .ab-prov:hover,
.page-about .ab-prov:focus-visible {
  background: var(--green);
  color: var(--ink);
}

.page-about .ab-prov:focus-visible {
  outline: 3px solid var(--orange);
  outline-offset: 2px;
}

.page-about .ab-prov::after {
  content: attr(data-city);
  position: absolute;
  left: 0;
  bottom: calc(100% + 8px);
  background: var(--ink);
  color: var(--paper);
  font-size: 0.75rem;
  font-weight: 400;
  line-height: 1.4;
  letter-spacing: 0;
  padding: 6px 10px;
  white-space: nowrap;
  opacity: 0;
  visibility: hidden;
  transform: translateY(4px);
  transition: opacity var(--ease), transform var(--ease), visibility var(--ease);
  pointer-events: none;
  z-index: 5;
}

.page-about .ab-prov:hover::after,
.page-about .ab-prov:focus-visible::after {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.page-about .ab-benefits {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: 3px solid var(--ink);
}

.page-about .ab-benefits li {
  background: var(--white);
  padding: 14px 16px;
  font-size: 0.9375rem;
  font-weight: 700;
}

.page-about .ab-link {
  color: var(--ink);
  font-weight: 900;
  text-decoration: none;
  border-bottom: 3px solid var(--orange);
  padding-bottom: 2px;
  transition: color var(--ease);
}

.page-about .ab-link:hover {
  color: var(--orange);
}

/* ---------- 为什么选择 ---------- */

.page-about .ab-why__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink);
  border: 3px solid var(--ink);
  margin-top: 26px;
}

.page-about .ab-why__item {
  background: var(--paper);
  padding: 24px 22px 26px;
}

.page-about .ab-why__item--lead {
  background: var(--white);
}

.page-about .ab-why__idx {
  display: block;
  font-family: var(--font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  letter-spacing: 0.1em;
  color: var(--green);
}

.page-about .ab-why__item--lead .ab-why__idx {
  font-size: 1.5rem;
}

.page-about .ab-why__title {
  font-size: 1.125rem;
  font-weight: 900;
  margin: 12px 0 10px;
}

.page-about .ab-why__item--lead .ab-why__title {
  font-size: clamp(1.35rem, 5vw, 1.9rem);
}

.page-about .ab-why__item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  max-width: 32em;
}

/* ---------- 收尾 ---------- */

.page-about .ab-cta {
  margin-top: 64px;
  padding: 30px 26px 28px;
  border: 3px solid var(--ink);
  background: var(--green-soft);
  box-shadow: var(--shadow-hard);
}

.page-about .ab-cta__text {
  margin: 0 0 20px;
  font-size: clamp(1.1rem, 4.5vw, 1.5rem);
  font-weight: 900;
  line-height: 1.4;
  max-width: 22em;
}

.page-about .ab-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .ab-cta__aside {
  margin: 22px 0 0;
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--ink);
}

/* ---------- 媒体查询 ---------- */

@media (min-width: 720px) {
  .page-about .ab-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .ab-stats__item {
    padding: 22px 18px 24px;
  }

  .page-about .ab-paths {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .ab-paths > .ab-path:nth-child(1) {
    grid-column: 1 / 7;
  }

  .page-about .ab-paths > .ab-path:nth-child(2) {
    grid-column: 7 / 13;
    margin-top: 36px;
  }

  .page-about .ab-paths > .ab-path:nth-child(3) {
    grid-column: 3 / 11;
    margin-top: 4px;
  }

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

  .page-about .ab-why__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 1fr);
    grid-template-rows: auto auto;
  }

  .page-about .ab-why__item--lead {
    grid-row: 1 / 3;
    padding: 34px 30px 36px;
  }
}

@media (min-width: 900px) {
  .page-about .ab-hero {
    padding-top: 40px;
  }

  .page-about .ab-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 400px);
    gap: 56px;
  }

  .page-about .ab-body {
    grid-template-columns: 182px minmax(0, 1fr);
    gap: 56px;
    padding-top: 72px;
    padding-bottom: 120px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 112px;
    padding: 14px 14px 18px;
  }

  .page-about .ab-rail__list {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 2px;
    padding-left: 24px;
  }

  .page-about .ab-rail__item {
    width: 100%;
  }

  .page-about .ab-rail__link {
    display: flex;
    width: 100%;
  }

  .page-about .ab-rail__anno {
    display: block;
    position: absolute;
    left: 8px;
    top: 16px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 12px;
    letter-spacing: 0.22em;
    color: var(--gray);
  }

  .page-about .ab-team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 1fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-chapter {
    padding-bottom: 88px;
  }

  .page-about .ab-chapter + .ab-chapter {
    margin-top: 88px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-tl .lq-accordion__trigger,
  .page-about .ab-prov,
  .page-about .ab-prov::after,
  .page-about .ab-rail__link,
  .page-about .ab-hero__link {
    transition: none;
  }

  .page-about .ab-tl .lq-accordion__trigger:hover {
    padding-left: 4px;
  }
}