.page-about {
  --ab-shadow: 0 10px 28px rgba(7, 38, 40, .34);
  --ab-pad-block: 56px;
  display: block;
}

.page-about .ab-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--text);
  padding: 34px 0 56px;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    linear-gradient(128deg, rgba(20, 103, 106, .58) 0%, rgba(11, 59, 60, 0) 58%),
    radial-gradient(circle at 88% 6%, rgba(47, 196, 178, .2), transparent 54%),
    radial-gradient(circle at 4% 96%, rgba(255, 106, 26, .14), transparent 46%);
  pointer-events: none;
}

.page-about .ab-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
}

.page-about .ab-hero-title {
  margin: 14px 0 0;
  font-size: clamp(2.1rem, 7.4vw, 4.2rem);
  line-height: 1.08;
  font-weight: 900;
  letter-spacing: -.01em;
  color: var(--text-strong);
}

.page-about .ab-lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .ab-hero-actions {
  margin-top: 28px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-stats {
  margin: 34px 0 0;
  padding-top: 22px;
  border-top: 1px solid var(--line);
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 16px;
}

.page-about .ab-stats .stat {
  display: block;
}

.page-about .ab-stats .stat-value {
  display: block;
  margin: 0;
  font-family: var(--mono);
  font-size: clamp(1.6rem, 5vw, 2.3rem);
  font-weight: 800;
  line-height: 1.1;
  color: var(--flare-soft);
}

.page-about .ab-stats .stat-label {
  display: block;
  margin: 6px 0 0;
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--text-dim);
}

.page-about .ab-hero-visual {
  position: relative;
}

.page-about .ab-hero-visual svg {
  display: block;
  width: 100%;
  height: auto;
  max-width: 520px;
  margin: 0 auto;
}

/* 发展历程 */
.page-about .ab-story {
  padding: var(--ab-pad-block) 0;
  background: var(--ink);
  color: var(--text);
}

.page-about .ab-story-grid {
  margin-top: 30px;
  display: grid;
  gap: 26px;
}

.page-about .ab-years {
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .ab-years-label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--text-dim);
}

.page-about .ab-year-list {
  margin: 0;
  padding: 0 0 4px;
  list-style: none;
  display: flex;
  gap: 10px;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .ab-year-list::-webkit-scrollbar {
  display: none;
}

.page-about .ab-year-link {
  display: inline-block;
  padding: 5px 10px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  font-family: var(--mono);
  font-size: 13px;
  color: var(--text-dim);
  text-decoration: none;
  transition: color .18s var(--ease), border-color .18s var(--ease), background-color .18s var(--ease);
}

.page-about .ab-year-link:hover,
.page-about .ab-year-link:focus-visible {
  color: var(--text-strong);
  border-color: var(--ping);
  background: rgba(47, 196, 178, .1);
}

.page-about .ab-chapter {
  position: relative;
  padding: 20px 4px 26px 22px;
  border-left: 1px solid var(--line);
  transition: background-color .22s var(--ease);
}

.page-about .ab-chapter::before {
  content: "";
  position: absolute;
  left: -5px;
  top: 30px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--felt);
  border: 1px solid var(--line);
  transition: background-color .22s var(--ease), transform .22s var(--ease);
}

.page-about .ab-chapter:last-child {
  padding-bottom: 8px;
}

.page-about .ab-chapter:target {
  background: linear-gradient(90deg, rgba(20, 103, 106, .34), rgba(20, 103, 106, 0) 82%);
}

.page-about .ab-chapter:target::before {
  background: var(--flare);
  transform: scale(1.25);
}

.page-about .ab-chapter-year {
  margin: 0;
  font-size: 1.35rem;
  font-weight: 800;
  letter-spacing: .04em;
  color: var(--ping);
}

.page-about .ab-chapter:target .ab-chapter-year {
  color: var(--flare);
}

.page-about .ab-chapter-title {
  margin: 8px 0 8px;
  font-size: 1.15rem;
  font-weight: 800;
  color: var(--text-strong);
}

.page-about .ab-chapter p:last-child {
  margin: 0;
  max-width: 66ch;
  line-height: 1.8;
  color: var(--text);
}

/* 产品理念 */
.page-about .ab-idea {
  padding: var(--ab-pad-block) 0;
  background: var(--white);
  color: var(--on-light);
}

.page-about .ab-idea-grid {
  display: grid;
  gap: 32px;
}

.page-about .ab-shot {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-deep);
  overflow: hidden;
}

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

.page-about .ab-shot figcaption {
  padding: 10px 14px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--text-dim);
  border-top: 1px solid var(--line-soft);
}

.page-about .ab-idea .section-title {
  margin: 12px 0 0;
  font-size: clamp(1.6rem, 5vw, 2.5rem);
  font-weight: 900;
  line-height: 1.16;
  color: var(--ink);
}

.page-about .ab-idea-copy > p {
  margin: 16px 0 0;
  max-width: 68ch;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .ab-idea-list {
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 14px;
}

.page-about .ab-idea-list li {
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-left: 3px solid var(--flare);
  border-radius: var(--radius);
  background: var(--fog);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-idea-list li:hover {
  transform: translateY(-4px);
  box-shadow: 0 10px 22px rgba(11, 59, 60, .14);
  border-color: var(--ping);
}

.page-about .ab-idea-list h3 {
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-idea-list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .ab-idea-tail {
  margin-top: 22px !important;
  padding-left: 14px;
  border-left: 2px solid var(--ping);
  font-weight: 600;
  color: var(--felt);
}

/* 团队 */
.page-about .ab-team {
  padding: var(--ab-pad-block) 0;
  background: var(--fog);
  color: var(--on-light);
}

.page-about .ab-team .section-title {
  margin: 10px 0 0;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 900;
  line-height: 1.18;
  color: var(--ink);
}

.page-about .ab-team .section-note {
  margin: 12px 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(11, 43, 44, .74);
}

.page-about .ab-team-grid {
  margin-top: 28px;
  display: grid;
  gap: 16px;
}

.page-about .ab-team-card {
  padding: 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--white);
  transition: transform .18s var(--ease), box-shadow .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-team-card:hover,
.page-about .ab-team-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--ping);
  box-shadow: 0 12px 26px rgba(11, 59, 60, .16);
  outline: none;
}

.page-about .ab-team-card:focus-visible {
  outline: 2px solid var(--flare);
  outline-offset: 2px;
}

.page-about .ab-team-num {
  margin: 0;
  font-size: clamp(2.4rem, 9vw, 3.2rem);
  font-weight: 800;
  line-height: 1;
  color: var(--ink);
}

.page-about .ab-team-card:hover .ab-team-num,
.page-about .ab-team-card:focus-visible .ab-team-num {
  color: var(--flare);
}

.page-about .ab-team-role {
  margin: 12px 0 4px;
  font-size: 1.06rem;
  font-weight: 800;
  color: var(--ink);
}

.page-about .ab-team-brief {
  margin: 0;
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--felt);
}

.page-about .ab-team-detail {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(11, 43, 44, .8);
}

.page-about .ab-team-rest {
  margin: 22px 0 0;
  padding: 16px 18px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: rgba(20, 103, 106, .1);
  font-size: 15px;
  line-height: 1.78;
  color: rgba(11, 43, 44, .84);
}

/* 质量标准 */
.page-about .ab-quality {
  position: relative;
  background: var(--ink-deep);
  color: var(--text);
  padding: 82px 0 64px;
  clip-path: polygon(0 38px, 100% 0, 100% 100%, 0 100%);
}

.page-about .ab-quality::after {
  content: "";
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 82% 12%, rgba(47, 196, 178, .16), transparent 52%);
  pointer-events: none;
}

.page-about .ab-quality-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 30px;
}

.page-about .ab-quality .section-title {
  margin: 12px 0 0;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 900;
  line-height: 1.18;
  color: var(--text-strong);
}

.page-about .ab-quality-copy > p {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .ab-gates {
  margin: 24px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-gates li {
  display: flex;
  align-items: center;
  gap: 10px;
  padding: 12px 14px;
  background: rgba(11, 59, 60, .62);
  font-size: 14px;
  line-height: 1.5;
  transition: background-color .18s var(--ease);
}

.page-about .ab-gates li:hover {
  background: rgba(20, 103, 106, .72);
}

.page-about .ab-gates .num {
  font-size: 12px;
  font-weight: 700;
  color: var(--ping);
}

.page-about .ab-specs {
  margin: 22px 0 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-spec {
  padding: 16px 14px;
  background: rgba(20, 103, 106, .26);
}

.page-about .ab-spec dt {
  margin: 0;
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--text-dim);
}

.page-about .ab-spec dd {
  margin: 8px 0 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--flare-soft);
}

/* 生态 */
.page-about .ab-eco {
  padding: var(--ab-pad-block) 0;
  background: var(--ink);
  color: var(--text);
}

.page-about .ab-eco .section-title {
  margin: 10px 0 0;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 900;
  line-height: 1.18;
  color: var(--text-strong);
}

.page-about .ab-eco .section-note {
  margin: 12px 0 0;
  max-width: 68ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .ab-eco-grid {
  margin-top: 28px;
  display: grid;
  gap: 26px;
}

.page-about .ab-eco-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 2px;
}

.page-about .ab-eco-row {
  display: grid;
  grid-template-columns: 84px minmax(0, 1fr) 40px;
  grid-template-areas:
    "region track count"
    "places places places";
  align-items: center;
  gap: 6px 12px;
  padding: 10px 12px;
  background: rgba(20, 103, 106, .18);
  border-left: 2px solid transparent;
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-eco-row:hover {
  background: rgba(20, 103, 106, .34);
  border-left-color: var(--ping);
}

.page-about .ab-eco-row--key {
  background: rgba(255, 106, 26, .13);
  border-left-color: var(--flare);
}

.page-about .ab-eco-row--key:hover {
  background: rgba(255, 106, 26, .22);
}

.page-about .ab-eco-region {
  grid-area: region;
  font-size: 13px;
  font-weight: 700;
  color: var(--text-strong);
}

.page-about .ab-eco-count {
  grid-area: count;
  text-align: right;
  font-size: 14px;
  font-weight: 800;
  color: var(--text-strong);
}

.page-about .ab-eco-row--key .ab-eco-count {
  color: var(--flare);
}

.page-about .ab-eco-track {
  grid-area: track;
  position: relative;
  display: block;
  height: 12px;
  border-radius: 2px;
  background: rgba(110, 131, 133, .22);
  overflow: hidden;
}

.page-about .ab-eco-track::after {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: var(--ab-share, 0%);
  background-image: radial-gradient(circle, var(--ping) 1.4px, transparent 1.5px);
  background-size: 7px 12px;
  background-repeat: repeat-x;
  transition: width .4s var(--ease);
}

.page-about .ab-eco-row--key .ab-eco-track::after {
  background-image: radial-gradient(circle, var(--flare) 1.4px, transparent 1.5px);
}

.page-about .ab-eco-row--east { --ab-share: 100%; }
.page-about .ab-eco-row--south { --ab-share: 71%; }
.page-about .ab-eco-row--north { --ab-share: 65%; }
.page-about .ab-eco-row--center { --ab-share: 56%; }
.page-about .ab-eco-row--west { --ab-share: 44%; }
.page-about .ab-eco-row--northwest { --ab-share: 35%; }
.page-about .ab-eco-row--northeast { --ab-share: 25%; }

.page-about .ab-eco-places {
  grid-area: places;
  font-size: 12px;
  letter-spacing: .05em;
  color: var(--text-dim);
}

.page-about .ab-eco-note {
  margin: 16px 0 0;
  padding: 14px 16px;
  border-left: 2px solid var(--flare);
  background: rgba(255, 106, 26, .08);
  font-size: 14px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .ab-eco-tail {
  margin: 26px 0 0;
  max-width: 78ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* 渠道承诺 */
.page-about .ab-deal {
  padding: var(--ab-pad-block) 0 calc(var(--ab-pad-block) + 8px);
  background: var(--white);
  color: var(--on-light);
}

.page-about .ab-deal-grid {
  display: grid;
  gap: 28px;
}

.page-about .ab-deal .section-title {
  margin: 10px 0 0;
  font-size: clamp(1.6rem, 5vw, 2.4rem);
  font-weight: 900;
  line-height: 1.18;
  color: var(--ink);
}

.page-about .ab-deal-copy > p {
  margin: 14px 0 0;
  max-width: 66ch;
  font-size: 16px;
  line-height: 1.8;
}

.page-about .ab-deal-list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .ab-deal-list li {
  padding: 14px 16px;
  background: var(--fog);
  font-size: 15px;
  line-height: 1.7;
  border-left: 3px solid var(--felt);
  transition: background-color .18s var(--ease), border-color .18s var(--ease);
}

.page-about .ab-deal-list li:hover {
  background: rgba(47, 196, 178, .16);
  border-left-color: var(--flare);
}

.page-about .ab-deal-actions {
  margin-top: 22px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .ab-deal-note {
  margin: 16px 0 0;
  font-size: 14px;
  line-height: 1.75;
  color: rgba(11, 43, 44, .72);
}

.page-about .ab-deal-note a {
  color: var(--felt);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .ab-deal-note a:hover,
.page-about .ab-deal-note a:focus-visible {
  color: var(--flare);
}

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

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

  .page-about .ab-eco-row {
    grid-template-columns: 96px minmax(0, 1fr) 48px auto;
    grid-template-areas: "region track count places";
  }

  .page-about .ab-eco-places {
    text-align: right;
  }
}

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

  .page-about .ab-hero {
    padding: 48px 0 74px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .78fr);
    gap: 54px;
    align-items: center;
  }

  .page-about .ab-stats {
    max-width: 520px;
  }

  .page-about .ab-story-grid {
    grid-template-columns: 118px minmax(0, 1fr);
    gap: 46px;
    align-items: start;
  }

  .page-about .ab-years {
    position: sticky;
    top: 96px;
    padding-bottom: 0;
    border-bottom: 0;
    border-left: 1px solid var(--line-soft);
    padding-left: 14px;
  }

  .page-about .ab-year-list {
    flex-direction: column;
    overflow: visible;
    gap: 8px;
    padding-bottom: 0;
  }

  .page-about .ab-year-link {
    width: 100%;
    text-align: center;
  }

  .page-about .ab-chapter {
    padding: 24px 8px 32px 28px;
  }

  .page-about .ab-idea-grid {
    grid-template-columns: minmax(0, .92fr) minmax(0, 1fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-idea-media {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-quality-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, .92fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-quality-media {
    position: sticky;
    top: 96px;
  }

  .page-about .ab-eco-grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, .96fr);
    gap: 40px;
    align-items: start;
  }

  .page-about .ab-deal-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, .86fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .ab-team-card .ab-team-detail {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: max-height .22s var(--ease), opacity .22s var(--ease);
  }

  .page-about .ab-team-card:hover .ab-team-detail,
  .page-about .ab-team-card:focus .ab-team-detail,
  .page-about .ab-team-card:focus-within .ab-team-detail {
    max-height: 200px;
    opacity: 1;
  }
}

@media (min-width: 1200px) {
  .page-about .ab-hero-title {
    letter-spacing: -.015em;
  }

  .page-about .ab-chapters {
    max-width: 760px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .ab-team-card,
  .page-about .ab-idea-list li,
  .page-about .ab-eco-track::after,
  .page-about .ab-team-detail {
    transition: none;
  }
}