.page-about {
  --axis-w: 188px;
  --about-gap: clamp(18px, 3vw, 34px);
  background: var(--paper);
  color: var(--ink);
}

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

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(20px, 3.4vw, 40px) 0 clamp(44px, 7vw, 86px);
  background:
    radial-gradient(760px 400px at 88% -6%, rgba(79, 169, 138, 0.18), transparent 62%),
    radial-gradient(620px 340px at 4% 6%, rgba(217, 84, 30, 0.2), transparent 58%),
    linear-gradient(180deg, #0B1B2B 0%, #143049 100%);
  color: var(--paper);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    linear-gradient(rgba(247, 243, 234, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(247, 243, 234, 0.05) 1px, transparent 1px);
  background-size: 56px 56px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), transparent 76%);
}

.page-about .about-hero .wrap {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__crumbs {
  margin-bottom: clamp(22px, 3vw, 38px);
}

.page-about .about-hero__crumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: rgba(247, 243, 234, 0.6);
}

.page-about .about-hero__crumbs li + li::before {
  content: "/";
  margin-right: 8px;
  color: rgba(247, 243, 234, 0.3);
}

.page-about .about-hero__crumbs a {
  color: rgba(247, 243, 234, 0.88);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.18s ease, color 0.18s ease;
}

.page-about .about-hero__crumbs a:hover {
  border-bottom-color: var(--terra);
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(28px, 5vw, 54px);
  align-items: end;
}

.page-about .about-hero__no {
  display: inline-block;
  margin: 0 0 18px;
  padding-bottom: 6px;
  border-bottom: 1px solid rgba(192, 138, 62, 0.55);
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(29px, 5.2vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  max-width: 19ch;
}

.page-about .about-hero__lede {
  margin: 0 0 28px;
  max-width: 62ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.84);
}

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

.page-about .about-hero .btn--outline {
  color: var(--paper);
  border-color: rgba(247, 243, 234, 0.42);
}

.page-about .about-hero .btn--outline:hover {
  border-color: var(--brass);
  color: var(--brass);
}

.page-about .about-hero__figure {
  margin: 0;
  border: 1px solid rgba(247, 243, 234, 0.2);
  overflow: hidden;
  background: var(--night);
}

.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

/* ---------- 主体两栏 ---------- */

.page-about .about-body {
  padding-top: clamp(36px, 6vw, 74px);
  padding-bottom: clamp(48px, 8vw, 104px);
}

.page-about .about-axis {
  display: none;
}

/* ---------- 章节通用 ---------- */

.page-about .about-sec {
  margin-bottom: clamp(46px, 7vw, 86px);
  padding-bottom: clamp(46px, 7vw, 86px);
  border-bottom: 1px solid var(--line);
}

.page-about .about-sec:last-child {
  margin-bottom: 0;
  padding-bottom: 0;
  border-bottom: 0;
}

.page-about .about-sec__no {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 16px;
  font-family: var(--font-num);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-sec__num {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  min-width: 36px;
  height: 24px;
  padding: 0 8px;
  background: var(--ink);
  color: var(--paper);
  font-weight: 700;
  letter-spacing: 0.06em;
}

.page-about .about-sec h2 {
  margin: 0 0 18px;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(23px, 3.2vw, 36px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  max-width: 26ch;
}

.page-about .about-sec__lede {
  margin: 0 0 30px;
  padding-left: 16px;
  border-left: 3px solid var(--terra);
  max-width: 62ch;
  font-weight: 500;
  font-size: clamp(15px, 1.5vw, 18px);
  line-height: 1.75;
  color: var(--ink);
}

.page-about .about-text > p {
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .about-text > p:last-child {
  margin-bottom: 0;
}

.page-about .about-split {
  display: grid;
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

/* ---------- 侧边说明卡 ---------- */

.page-about .about-note {
  padding: 22px 22px 12px;
  background: var(--paper-2);
  border: 1px solid var(--line);
  box-shadow: var(--sheet);
}

.page-about .about-note__k {
  margin: 0 0 4px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--brass-ink);
}

.page-about .about-note__v {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.68;
  color: var(--ink);
}

.page-about .about-note__v:last-child {
  margin-bottom: 12px;
}

/* ---------- 时间线 ---------- */

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

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(30px, 4.4vw, 46px) 34px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--brass);
  transition: background 0.2s ease, border-color 0.2s ease;
}

.page-about .about-timeline__item::after {
  content: "";
  position: absolute;
  left: 7px;
  top: 24px;
  bottom: 0;
  width: 1px;
  background: var(--line);
}

.page-about .about-timeline__item:last-child::after {
  display: none;
}

.page-about .about-timeline__item:hover::before,
.page-about .about-timeline__item:focus-within::before {
  background: var(--terra);
  border-color: var(--terra);
}

.page-about .about-timeline__year {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: clamp(24px, 3vw, 34px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--ink);
}

.page-about .about-timeline__body h3 {
  margin: 0 0 7px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--ink);
}

.page-about .about-timeline__body p {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.82;
  color: var(--graphite);
}

/* ---------- 版图点阵 ---------- */

.page-about .about-map {
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  padding: clamp(22px, 3.2vw, 38px);
  background: var(--ink);
  border: 1px solid var(--night);
  box-shadow: var(--sheet);
}

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

.page-about .about-map__svg {
  display: block;
  width: 100%;
  max-width: 460px;
  height: auto;
  margin: 0 auto;
}

.page-about .about-map__dot--full {
  fill: var(--brass);
}

.page-about .about-map__dot--multi {
  fill: var(--mint);
}

.page-about .about-map__dot--single {
  fill: #8A9099;
}

.page-about .about-map__cap {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.7;
  color: rgba(247, 243, 234, 0.6);
}

.page-about .about-map__legend {
  display: grid;
  gap: 14px;
  margin: 0 0 24px;
  padding: 0;
  list-style: none;
}

.page-about .about-map__legend li {
  display: flex;
  gap: 10px;
  align-items: baseline;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(247, 243, 234, 0.8);
}

.page-about .about-map__legend b {
  color: var(--paper);
  font-weight: 700;
}

.page-about .about-map__swatch {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  transform: translateY(-1px);
}

.page-about .about-map__swatch--full {
  background: var(--brass);
}

.page-about .about-map__swatch--multi {
  background: var(--mint);
}

.page-about .about-map__swatch--single {
  background: #8A9099;
}

.page-about .about-map__cities-title {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(247, 243, 234, 0.55);
}

.page-about .about-cities {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-cities li {
  padding: 6px 12px;
  border: 1px solid rgba(247, 243, 234, 0.26);
  font-size: 13px;
  line-height: 1.4;
  color: rgba(247, 243, 234, 0.9);
  background: rgba(247, 243, 234, 0.05);
}

/* ---------- 网点分级 ---------- */

.page-about .about-tiers {
  display: grid;
  gap: 16px;
  margin: clamp(28px, 4vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tier {
  padding: 22px 20px;
  background: var(--paper);
  border: 1px solid var(--line-strong);
  box-shadow: var(--sheet);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-tier:hover,
.page-about .about-tier:focus-within {
  transform: translateY(-2px);
  box-shadow: var(--sheet-hover);
}

.page-about .about-tier__num {
  margin: 0 0 6px;
  font-family: var(--font-num);
  font-size: 38px;
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-tier__num small {
  margin-left: 6px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.page-about .about-tier__name {
  display: inline-block;
  margin: 0 0 12px;
  padding-bottom: 8px;
  border-bottom: 2px solid var(--terra);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-tier__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
}

.page-about .about-tier__cities {
  max-height: none;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tier__cities li {
  position: relative;
  padding: 4px 0 4px 14px;
  font-size: 13px;
  line-height: 1.55;
  color: var(--graphite);
}

.page-about .about-tier__cities li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 12px;
  width: 6px;
  height: 1px;
  background: var(--terra);
}

/* ---------- 数据条 ---------- */

.page-about .about-stats {
  display: grid;
  gap: 1px;
  margin: 0 0 clamp(26px, 3.4vw, 38px);
  padding: 0;
  list-style: none;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-stat {
  padding: 22px 20px;
  background: var(--paper);
}

.page-about .about-stat__num {
  margin: 0 0 8px;
  font-family: var(--font-num);
  font-size: clamp(30px, 4vw, 42px);
  font-weight: 700;
  line-height: 1;
  color: var(--ink);
}

.page-about .about-stat__num span {
  margin-left: 4px;
  font-size: 14px;
  letter-spacing: 0.1em;
  color: var(--terra);
}

.page-about .about-stat__label {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 图片框 ---------- */

.page-about .about-fig {
  margin: 0;
  padding: 8px;
  background: var(--paper-2);
  border: 1px solid var(--line-strong);
  box-shadow: var(--sheet);
}

.page-about .about-fig img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-fig--wide {
  margin-top: clamp(26px, 3.4vw, 40px);
}

.page-about .about-fig--wide img {
  aspect-ratio: 16 / 9;
}

.page-about .about-fig figcaption {
  padding: 10px 4px 2px;
  font-size: 12.5px;
  line-height: 1.68;
  color: var(--graphite);
}

/* ---------- 引用块 ---------- */

.page-about .about-quote {
  padding: clamp(22px, 3vw, 32px);
  background: var(--rain);
  border-left: 4px solid var(--brass);
}

.page-about .about-quote p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(247, 243, 234, 0.92);
}

/* ---------- 合作生态 ---------- */

.page-about .about-partners {
  display: grid;
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
}

.page-about .about-partner {
  padding: 24px 20px;
  background: var(--paper);
}

.page-about .about-partner__num {
  margin: 0 0 10px;
  font-family: var(--font-num);
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--brass-ink);
}

.page-about .about-partner__num small {
  margin-left: 5px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.page-about .about-partner__name {
  margin: 0 0 8px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-partner__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--graphite);
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(26px, 3.4vw, 38px);
}

.page-about .about-cta__note {
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--graphite);
  max-width: 70ch;
}

/* ---------- 平板 ---------- */

@media (min-width: 640px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 22px;
    align-items: start;
  }

  .page-about .about-timeline__year {
    margin-bottom: 0;
    padding-top: 2px;
  }
}

@media (min-width: 780px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1.62fr) minmax(0, 1fr);
  }

  .page-about .about-split--flip {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }

  .page-about .about-tiers {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-tier:nth-child(2) {
    margin-top: 14px;
  }

  .page-about .about-tier:nth-child(3) {
    margin-top: 28px;
  }

  .page-about .about-tier__cities {
    max-height: 0;
    margin-top: 0;
    overflow: hidden;
    transition: max-height 0.3s ease, margin-top 0.3s ease;
  }

  .page-about .about-tier:hover .about-tier__cities,
  .page-about .about-tier:focus-within .about-tier__cities {
    max-height: 200px;
    margin-top: 14px;
  }

  .page-about .about-map {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    align-items: center;
  }

  .page-about .about-partners {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 桌面：左轴 + 右正文 ---------- */

@media (min-width: 1024px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: clamp(36px, 4.6vw, 64px);
  }

  .page-about .about-body {
    display: grid;
    grid-template-columns: var(--axis-w) minmax(0, 1fr);
    gap: clamp(40px, 5vw, 78px);
    align-items: start;
  }

  .page-about .about-axis {
    display: block;
    position: sticky;
    top: 30px;
    align-self: start;
  }

  .page-about .about-axis__head {
    margin: 0 0 14px;
    padding-bottom: 10px;
    border-bottom: 1px solid var(--line-strong);
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: var(--graphite);
  }

  .page-about .about-axis__list {
    margin: 0;
    padding: 0;
    list-style: none;
  }

  .page-about .about-axis__link {
    position: relative;
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 10px 0 10px 18px;
    border-left: 2px solid var(--line);
    font-size: 13.5px;
    line-height: 1.45;
    color: var(--graphite);
    text-decoration: none;
    transition: color 0.18s ease, border-color 0.18s ease, background 0.18s ease;
  }

  .page-about .about-axis__link::before {
    content: "";
    position: absolute;
    left: -5px;
    top: 15px;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    background: var(--paper);
    border: 2px solid var(--brass);
    transition: background 0.18s ease, border-color 0.18s ease;
  }

  .page-about .about-axis__link:hover,
  .page-about .about-axis__link:focus-visible,
  .page-about .about-axis__link[aria-current],
  .page-about .about-axis__link.is-active {
    color: var(--ink);
    border-left-color: var(--terra);
    background: rgba(217, 84, 30, 0.05);
  }

  .page-about .about-axis__link:hover::before,
  .page-about .about-axis__link:focus-visible::before,
  .page-about .about-axis__link[aria-current]::before,
  .page-about .about-axis__link.is-active::before {
    background: var(--terra);
    border-color: var(--terra);
  }

  .page-about .about-axis__no {
    flex: 0 0 auto;
    font-family: var(--font-num);
    font-size: 11px;
    letter-spacing: 0.1em;
    color: var(--brass-ink);
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero__figure {
    margin-bottom: -26px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tier,
  .page-about .about-tier__cities,
  .page-about .about-axis__link,
  .page-about .about-axis__link::before,
  .page-about .about-timeline__item::before {
    transition: none;
  }

  .page-about .about-tier:hover,
  .page-about .about-tier:focus-within {
    transform: none;
  }
}