.page-about {
  --about-rail-w: 220px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-sans);
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 24px;
  padding-bottom: 6px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: 26px 0 46px;
}

.page-about .about-hero__inner {
  display: grid;
  gap: 30px;
}

.page-about .about-hero__eyebrow {
  margin: 0 0 16px;
  color: var(--stone);
  font-size: 13px;
  letter-spacing: var(--track-wide);
}

.page-about .about-hero__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(48px, 12vw, 92px);
  line-height: 0.98;
  letter-spacing: -0.02em;
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 82px;
  height: 6px;
  margin-top: 20px;
  border-radius: 3px;
  background: linear-gradient(90deg, var(--cinnabar) 0%, var(--cinnabar) 58%, var(--gold) 100%);
}

.page-about .about-hero__lead {
  margin: 22px 0 0;
  max-width: 48ch;
  font-size: 16.5px;
  line-height: 1.82;
  color: var(--ink-2);
}

.page-about .about-hero__side {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(132px, 1fr));
  gap: 1px;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  overflow: hidden;
}

.page-about .about-hero__fact {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 18px 16px;
  background: var(--card);
}

.page-about .about-hero__num {
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--cinnabar);
}

.page-about .about-hero__label {
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--stone);
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 40px 0 56px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
    gap: 60px;
  }
}

/* ---------- 章节跳转条 ---------- */
.page-about .about-jump {
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
  background: var(--mist);
}

.page-about .about-jump__list {
  display: flex;
  gap: 6px;
  margin: 0;
  padding: 10px 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

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

.page-about .about-jump__link {
  display: inline-block;
  padding: 7px 15px;
  border: 1px solid transparent;
  border-radius: 999px;
  font-size: 14px;
  color: var(--ink-2);
  text-decoration: none;
  white-space: nowrap;
  transition: background 0.25s var(--ease), color 0.25s var(--ease), border-color 0.25s var(--ease);
}

.page-about .about-jump__link:hover {
  background: var(--card);
  border-color: var(--line-strong);
}

.page-about .about-jump__link.is-active {
  background: var(--cinnabar);
  border-color: var(--cinnabar);
  color: #fff;
}

/* ---------- 通用章节骨架 ---------- */
.page-about .about-block {
  padding: 54px 0;
}

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

.page-about .about-block__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-block__index {
  display: inline-block;
  margin-bottom: 14px;
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-strong);
  font-size: 13px;
  letter-spacing: 0.2em;
  color: var(--cinnabar);
}

.page-about .about-block__title {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(26px, 5vw, 36px);
  line-height: 1.26;
  letter-spacing: -0.01em;
}

.page-about .about-block__head {
  display: grid;
  gap: 12px;
  max-width: 720px;
  margin-bottom: 34px;
}

.page-about .about-block__note {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--stone);
}

.page-about .about-block__body p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .about-block__lead {
  font-size: 17px;
  line-height: 1.82;
  color: var(--ink);
}

@media (min-width: 900px) {
  .page-about .about-block {
    padding: 78px 0;
  }

  .page-about .about-block__grid {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 58px;
    align-items: start;
  }

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

/* ---------- 阶段要点提示块 ---------- */
.page-about .about-callout {
  margin-top: 28px;
  padding: 22px 24px;
  border-left: 3px solid var(--gold);
  border-radius: var(--radius-m);
  background: var(--card);
  box-shadow: var(--shadow-soft);
}

.page-about .about-callout__label {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 16px;
  color: var(--ink);
}

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

.page-about .about-list li {
  position: relative;
  padding-left: 20px;
  font-size: 15px;
  line-height: 1.76;
  color: var(--ink-2);
}

.page-about .about-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 2px;
  background: var(--cinnabar);
  transform: rotate(45deg);
}

/* ---------- 阶段横幅 ---------- */
.page-about .about-history__banner {
  margin: 0 0 42px;
  border-radius: var(--radius-l);
  overflow: hidden;
  box-shadow: var(--shadow-card);
}

.page-about .about-history__banner img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-timeline__item {
  position: relative;
  margin-left: 6px;
  padding: 0 0 34px 30px;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
  border-left-color: transparent;
}

.page-about .about-timeline__marker {
  position: absolute;
  left: -7px;
  top: 8px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--cinnabar);
  box-shadow: 0 0 0 4px var(--paper), 0 0 0 5px rgba(185, 58, 50, 0.3);
}

.page-about .about-timeline__item--now .about-timeline__marker {
  background: var(--gold);
  box-shadow: 0 0 0 4px var(--mist), 0 0 0 5px rgba(201, 162, 39, 0.35);
}

.page-about .about-timeline__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin-bottom: 10px;
}

.page-about .about-timeline__stage {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15px;
  letter-spacing: 0.06em;
  color: var(--ink);
}

.page-about .about-timeline__content h3 {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 21px;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-timeline__content p {
  margin: 0;
  max-width: 62ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-2);
}

@media (min-width: 820px) {
  .page-about .about-timeline__item {
    display: grid;
    grid-template-columns: 172px minmax(0, 1fr);
    gap: 30px;
    padding: 0 0 38px 34px;
  }

  .page-about .about-timeline__meta {
    flex-direction: column;
    align-items: flex-start;
    gap: 8px;
    margin-bottom: 0;
  }
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-coverage {
  display: grid;
  gap: 20px;
  margin: 28px 0 26px;
}

.page-about .about-coverage__map {
  position: relative;
  min-height: 196px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background-color: var(--card);
  background-image: radial-gradient(circle, var(--celadon-light) 1.4px, transparent 1.5px);
  background-size: 20px 20px;
  overflow: hidden;
}

.page-about .about-coverage__pin {
  position: absolute;
  width: 15px;
  height: 15px;
  border-radius: 50%;
  background: var(--cinnabar);
  animation: aboutPin 3.6s var(--ease) infinite;
}

.page-about .about-coverage__pin--1 { left: 18%; top: 24%; animation-delay: 0s; }
.page-about .about-coverage__pin--2 { left: 38%; top: 48%; animation-delay: 0.6s; }
.page-about .about-coverage__pin--3 { left: 56%; top: 28%; animation-delay: 1.2s; }
.page-about .about-coverage__pin--4 { left: 70%; top: 64%; animation-delay: 1.8s; }
.page-about .about-coverage__pin--5 { left: 30%; top: 72%; animation-delay: 2.4s; }

@keyframes aboutPin {
  0%, 100% { box-shadow: 0 0 0 4px rgba(185, 58, 50, 0.14); }
  50% { box-shadow: 0 0 0 10px rgba(185, 58, 50, 0.03); }
}

.page-about .about-coverage__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-coverage__stat {
  padding: 16px 18px;
  background: var(--card);
}

.page-about .about-coverage__stat dt {
  margin-bottom: 6px;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--stone);
}

.page-about .about-coverage__stat dd {
  margin: 0;
  font-size: 17px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-coverage__figure {
  margin: 0 0 24px;
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.page-about .about-coverage__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 720px) {
  .page-about .about-coverage {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 1fr);
    gap: 28px;
  }

  .page-about .about-coverage__map {
    min-height: 240px;
  }
}

@media (max-width: 479px) {
  .page-about .about-coverage__stats {
    grid-template-columns: 1fr;
  }
}

/* ---------- 会员等级 ---------- */
.page-about .about-tiers {
  display: grid;
  gap: 16px;
}

.page-about .about-tier {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 12px;
  padding: 28px 22px 28px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--card);
  overflow: hidden;
  transition: transform 0.35s var(--ease), box-shadow 0.35s var(--ease), border-color 0.35s var(--ease);
}

.page-about .about-tier::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 4px;
  background: var(--celadon);
}

.page-about .about-tier:nth-child(2)::before { background: var(--clay); }
.page-about .about-tier:nth-child(3)::before { background: var(--gold); }
.page-about .about-tier:nth-child(4)::before { background: var(--cinnabar); }

.page-about .about-tier:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
  box-shadow: var(--shadow-card);
}

.page-about .about-tier__level {
  margin: 0;
  font-size: 12px;
  letter-spacing: 0.22em;
  color: var(--stone);
}

.page-about .about-tier__name {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 25px;
  line-height: 1.2;
  color: var(--ink);
}

.page-about .about-tier__desc {
  margin: 0;
  padding-bottom: 14px;
  border-bottom: 1px solid var(--line);
  font-size: 13.5px;
  line-height: 1.72;
  color: var(--stone);
}

.page-about .about-tier__list {
  display: grid;
  gap: 9px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tier__list li {
  position: relative;
  padding-left: 18px;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-2);
}

.page-about .about-tier__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  border-radius: 1px;
  background: var(--celadon);
  transform: rotate(45deg);
}

.page-about .about-tier--feature {
  background: var(--ink);
  border-color: var(--ink);
}

.page-about .about-tier--feature .about-tier__level { color: var(--gold); }
.page-about .about-tier--feature .about-tier__name { color: var(--paper); }

.page-about .about-tier--feature .about-tier__desc {
  border-bottom-color: var(--line-light);
  color: rgba(245, 240, 230, 0.7);
}

.page-about .about-tier--feature .about-tier__list li { color: rgba(245, 240, 230, 0.88); }
.page-about .about-tier--feature .about-tier__list li::before { background: var(--gold); }

.page-about .about-tiers__foot {
  margin: 26px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--gold);
  font-size: 14px;
  line-height: 1.8;
  color: var(--stone);
}

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

@media (min-width: 1040px) {
  .page-about .about-tiers {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }
}

/* ---------- 生态与资质 ---------- */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  margin: 28px 0 26px;
}

.page-about .about-stats__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 20px 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius-m);
  background: var(--card);
}

.page-about .about-stats__figure {
  display: flex;
  align-items: baseline;
  gap: 4px;
}

.page-about .about-stats__num {
  font-size: 34px;
  font-weight: 700;
  line-height: 1;
  color: var(--cinnabar);
}

.page-about .about-stats__unit {
  font-size: 14px;
  color: var(--stone);
}

.page-about .about-stats__label {
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--ink-2);
}

.page-about .about-ecosystem__figure {
  margin: 0 0 24px;
  border-radius: var(--radius-m);
  overflow: hidden;
  box-shadow: var(--shadow-soft);
}

.page-about .about-ecosystem__figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 下一步入口 ---------- */
.page-about .about-next {
  padding: 58px 0 70px;
  background: var(--ink);
  color: var(--paper);
}

.page-about .about-next__title {
  margin: 0 0 14px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: clamp(28px, 5.4vw, 44px);
  line-height: 1.24;
  color: var(--paper);
}

.page-about .about-next__lead {
  margin: 0 0 32px;
  max-width: 60ch;
  font-size: 16px;
  line-height: 1.82;
  color: rgba(245, 240, 230, 0.76);
}

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

.page-about .about-next__links > li {
  display: flex;
}

.page-about .about-next__link {
  display: flex;
  flex: 1;
  flex-direction: column;
  gap: 8px;
  padding: 24px 22px;
  border: 1px solid var(--line-light);
  border-radius: var(--radius-m);
  background: rgba(245, 240, 230, 0.03);
  color: var(--paper);
  text-decoration: none;
  transition: background 0.3s var(--ease), border-color 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-next__link:hover {
  transform: translateY(-3px);
  border-color: var(--cinnabar);
  background: rgba(245, 240, 230, 0.08);
}

.page-about .about-next__link-title {
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 21px;
  color: var(--paper);
}

.page-about .about-next__link-text {
  font-size: 14px;
  line-height: 1.75;
  color: rgba(245, 240, 230, 0.7);
}

@media (min-width: 760px) {
  .page-about .about-next__links {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }
}

@media (min-width: 900px) {
  .page-about .about-next {
    padding: 84px 0 96px;
  }
}

/* ---------- 动效降级 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about .about-coverage__pin {
    animation: none;
    box-shadow: 0 0 0 4px rgba(185, 58, 50, 0.14);
  }

  .page-about .about-tier,
  .page-about .about-next__link,
  .page-about .about-jump__link {
    transition: none;
  }
}