.page-about {
  --about-paper: var(--cream-100);
  --about-paper-deep: var(--cream-300);
  --about-ink: var(--brown-900);
  --about-hair: rgba(35, 26, 18, .16);
  --about-hair-strong: rgba(35, 26, 18, .32);
  --about-accent: #A8410B;
  background: var(--ink-900);
  color: var(--line-100);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(22px, 4vw, 40px) 0 clamp(44px, 6vw, 88px);
  background:
    radial-gradient(115% 85% at 90% -15%, rgba(0, 229, 208, .16), transparent 62%),
    radial-gradient(85% 70% at 4% 112%, rgba(255, 122, 26, .15), transparent 64%),
    var(--ink-900);
  overflow: hidden;
}

.page-about .about-hero .breadcrumbs {
  font-size: 12px;
  letter-spacing: .08em;
  margin-bottom: clamp(26px, 4vw, 48px);
}

.page-about .about-hero .breadcrumb-link {
  color: var(--cyan-300);
  text-decoration: none;
}

.page-about .about-hero .breadcrumb-link:hover {
  color: var(--orange-300);
}

.page-about .about-hero .breadcrumb-sep {
  color: rgba(248, 250, 252, .38);
  margin: 0 7px;
}

.page-about .about-hero .breadcrumb-current {
  color: rgba(248, 250, 252, .7);
}

.page-about .about-hero-grid {
  gap: clamp(22px, 3vw, 44px);
  align-items: start;
}

.page-about .about-hero-side {
  display: flex;
  flex-direction: column;
  gap: 20px;
  padding-left: 16px;
  border-left: 1px solid var(--rule-strong);
  min-width: 0;
}

.page-about .about-hero-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .2em;
  color: var(--cyan-500);
}

.page-about .about-hero-side .vertical-note {
  writing-mode: vertical-rl;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .22em;
  color: rgba(111, 246, 232, .8);
  max-height: 190px;
  margin: 0;
}

.page-about .about-hero-svg {
  width: 84px;
  height: auto;
  margin-top: auto;
}

.page-about .about-hero-main {
  min-width: 0;
}

.page-about .about-hero-main .display {
  margin: 10px 0 20px;
  max-width: 22ch;
}

.page-about .about-hero-main .lede {
  max-width: 60ch;
}

.page-about .about-hero-main .lede + .lede {
  margin-top: 12px;
}

.page-about .about-stats {
  list-style: none;
  margin: 34px 0 0;
  padding: 24px 0 0;
  border-top: 1px solid var(--rule);
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 20px 24px;
}

.page-about .about-stat {
  min-width: 0;
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  line-height: 1.1;
  color: var(--cyan-500);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 7px;
  font-size: 12.5px;
  line-height: 1.55;
  color: rgba(248, 250, 252, .68);
}

/* ---------- 亮区长文 ---------- */
.page-about .about-body {
  background: var(--about-paper);
  color: var(--about-ink);
  padding: clamp(38px, 6vw, 82px) 0 clamp(46px, 7vw, 96px);
}

.page-about .about-body-grid {
  gap: clamp(22px, 3vw, 44px);
  align-items: start;
}

.page-about .about-rail {
  position: sticky;
  top: calc(var(--header-h) + 22px);
  align-self: start;
  min-width: 0;
}

.page-about .about-rail-list {
  list-style: none;
  margin: 0;
  padding: 0;
  border-left: 1px solid var(--about-hair);
}

.page-about .about-rail-list a {
  display: block;
  margin-left: -1px;
  padding: 9px 0 9px 15px;
  border-left: 2px solid transparent;
  font-size: 13px;
  line-height: 1.4;
  color: rgba(35, 26, 18, .7);
  text-decoration: none;
  transition: color .25s var(--ease), border-color .25s var(--ease), background-color .25s var(--ease);
}

.page-about .about-rail-list a:hover,
.page-about .about-rail-list a:focus-visible {
  color: var(--about-ink);
  border-left-color: var(--orange-500);
  background: rgba(255, 122, 26, .08);
}

.page-about .about-main {
  min-width: 0;
}

.page-about .about-block {
  padding: clamp(28px, 4vw, 46px) 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-block:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-block-num {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .26em;
  color: var(--about-accent);
  margin: 0 0 10px;
}

.page-about .about-main .headline {
  color: var(--about-ink);
  margin: 0 0 16px;
  max-width: 26ch;
}

.page-about .about-main p {
  line-height: 1.75;
  margin: 0 0 14px;
  max-width: 64ch;
}

.page-about .about-link {
  color: var(--about-accent);
  text-decoration: none;
  border-bottom: 1px solid rgba(168, 65, 11, .38);
  transition: border-color .2s var(--ease), color .2s var(--ease);
}

.page-about .about-link:hover {
  color: var(--orange-500);
  border-bottom-color: var(--orange-500);
}

/* 业务范围行式列表 */
.page-about .scope-rows {
  margin: 28px 0 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .scope-row {
  display: grid;
  grid-template-columns: minmax(0, 170px) minmax(0, 1fr);
  gap: 8px 24px;
  padding: 16px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .scope-row dt {
  font-weight: 700;
  font-size: 14.5px;
  color: var(--about-ink);
  line-height: 1.6;
}

.page-about .scope-row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(35, 26, 18, .78);
  max-width: 56ch;
}

/* ---------- 权益四类 ---------- */
.page-about .benefit-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  margin-top: 28px;
  align-items: start;
}

.page-about .benefit-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
  min-width: 0;
}

.page-about .benefit-card {
  border: 1px solid var(--about-hair-strong);
  border-radius: 4px;
  background: #FBF7EE;
  overflow: hidden;
  min-width: 0;
  transition: border-color .25s var(--ease), box-shadow .25s var(--ease);
}

.page-about .benefit-card:hover {
  border-color: rgba(0, 229, 208, .6);
}

.page-about .benefit-card[open] {
  border-color: var(--ink-500);
  box-shadow: 0 2px 0 0 rgba(0, 229, 208, .5);
}

.page-about .benefit-head {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 15px 16px;
  cursor: pointer;
  list-style: none;
  color: var(--about-ink);
}

.page-about .benefit-head::-webkit-details-marker {
  display: none;
}

.page-about .benefit-head::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  line-height: 1;
  color: var(--about-accent);
}

.page-about .benefit-card[open] .benefit-head::after {
  content: "–";
}

.page-about .benefit-index {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .12em;
  color: var(--about-accent);
}

.page-about .benefit-title {
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .01em;
}

.page-about .benefit-body {
  padding: 0 16px 18px;
  border-top: 1px dashed var(--about-hair);
  margin-top: 2px;
}

.page-about .benefit-body p {
  margin: 14px 0 10px;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(35, 26, 18, .82);
  max-width: none;
}

.page-about .benefit-body ul {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .benefit-body li {
  position: relative;
  padding-left: 15px;
  font-size: 13px;
  line-height: 1.68;
  color: rgba(35, 26, 18, .72);
  margin-bottom: 6px;
}

.page-about .benefit-body li::before {
  content: "";
  position: absolute;
  left: 0;
  top: .62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan-500);
}

.page-about .benefit-figure {
  margin: 0;
}

.page-about .figure-media {
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  border: 1px solid var(--about-hair-strong);
  background: var(--about-paper-deep);
}

.page-about .figure-media[data-ratio="2:1"] {
  aspect-ratio: 2 / 1;
}

.page-about .figure-media[data-ratio="1:1"] {
  aspect-ratio: 1 / 1;
}

.page-about .figure-media img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .figure-caption {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(35, 26, 18, .64);
}

/* ---------- 版本时间线 ---------- */
.page-about .about-timeline-figure {
  margin: 26px 0 0;
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 34px 0 0;
  padding: 0 0 0 24px;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan-500), var(--orange-500));
}

.page-about .tl-item {
  position: relative;
  padding-bottom: 26px;
}

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

.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--about-paper);
  border: 2px solid var(--cyan-500);
  transition: transform .25s var(--ease), border-color .25s var(--ease);
}

.page-about .tl-item:last-child::before {
  background: var(--orange-500);
  border-color: var(--orange-500);
}

.page-about .tl-item:hover::before {
  transform: scale(1.25);
  border-color: var(--orange-500);
}

.page-about .tl-ver {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--about-accent);
  background: rgba(255, 122, 26, .12);
  padding: 3px 9px;
  border-radius: 2px;
  transition: background-color .25s var(--ease), color .25s var(--ease);
}

.page-about .tl-item:hover .tl-ver {
  background: var(--orange-500);
  color: #FFF7EE;
}

.page-about .tl-title {
  margin: 10px 0 6px;
  font-size: 16.5px;
  line-height: 1.45;
  color: var(--about-ink);
}

.page-about .tl-item p {
  margin: 0 0 6px;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(35, 26, 18, .76);
  max-width: 58ch;
}

.page-about .tl-note {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .08em;
  color: rgba(35, 26, 18, .5) !important;
}

/* ---------- 三条团队线 ---------- */
.page-about .team-layout {
  display: grid;
  grid-template-columns: minmax(0, 1.45fr) minmax(0, .9fr);
  gap: clamp(22px, 3vw, 36px);
  margin-top: 28px;
  align-items: start;
}

.page-about .team-lines {
  min-width: 0;
}

.page-about .team-line {
  margin-bottom: 22px;
  padding: 4px 0 4px 20px;
  border-left: 8px solid var(--cyan-500);
}

.page-about .team-line-1 {
  border-left-width: 9px;
  border-left-color: var(--cyan-500);
}

.page-about .team-line-2 {
  border-left-width: 6px;
  border-left-color: var(--orange-500);
}

.page-about .team-line-3 {
  border-left-width: 3px;
  border-left-color: rgba(35, 26, 18, .45);
}

.page-about .team-title {
  margin: 0 0 6px;
  font-size: 16.5px;
  line-height: 1.4;
  color: var(--about-ink);
}

.page-about .team-line p {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: rgba(35, 26, 18, .78);
  max-width: 56ch;
}

.page-about .team-link-note {
  margin: 6px 0 0 !important;
  padding: 12px 16px;
  background: rgba(0, 229, 208, .1);
  border-left: 3px solid var(--cyan-500);
  font-size: 13.5px !important;
  line-height: 1.7;
  color: rgba(35, 26, 18, .8) !important;
  max-width: 56ch;
}

.page-about .team-figure {
  margin: 0;
}

/* ---------- 落点与节奏 ---------- */
.page-about .cadence-rows {
  margin: 28px 0 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .cadence-row {
  display: grid;
  grid-template-columns: minmax(0, 200px) minmax(0, 1fr);
  gap: 6px 24px;
  padding: 15px 0;
  border-bottom: 1px solid var(--about-hair);
}

.page-about .cadence-row dt {
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-accent);
}

.page-about .cadence-row dd {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.7;
  color: rgba(35, 26, 18, .78);
  max-width: 58ch;
}

.page-about .about-quote {
  margin: 34px 0 0;
  padding: 20px 22px;
  border-left: 6px solid var(--orange-500);
  background: linear-gradient(90deg, rgba(255, 122, 26, .12), rgba(244, 239, 227, 0));
}

.page-about .about-quote p {
  margin: 0;
  font-size: 16px;
  line-height: 1.72;
  color: var(--about-ink);
  max-width: 52ch;
}

/* ---------- 长期使用 ---------- */
.page-about .longevity-list {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 20px;
}

.page-about .longevity-item {
  position: relative;
  padding: 20px 18px 18px;
  background: #FBF7EE;
  border: 1px solid var(--about-hair);
  border-radius: 4px;
  min-width: 0;
}

.page-about .longevity-mark {
  display: block;
  width: 26px;
  height: 3px;
  margin-bottom: 14px;
  background: linear-gradient(90deg, var(--cyan-500), var(--orange-500));
}

.page-about .longevity-title {
  margin: 0 0 8px;
  font-size: 15.5px;
  line-height: 1.4;
  color: var(--about-ink);
}

.page-about .longevity-item p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.72;
  color: rgba(35, 26, 18, .76);
  max-width: none;
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  padding: clamp(40px, 5vw, 72px) 0;
  background:
    radial-gradient(90% 120% at 92% 0%, rgba(255, 122, 26, .16), transparent 60%),
    linear-gradient(135deg, var(--ink-700), var(--ink-900) 72%);
  color: var(--line-100);
  border-top: 1px solid var(--rule-strong);
}

.page-about .about-cta .headline {
  color: var(--line-100);
  margin: 10px 0 14px;
  max-width: 24ch;
}

.page-about .about-cta-lede {
  max-width: 62ch;
  line-height: 1.75;
  color: rgba(248, 250, 252, .76);
  margin: 0;
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 响应式 ---------- */
@media (max-width: 1080px) {
  .page-about .about-stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 900px) {
  .page-about .benefit-layout,
  .page-about .team-layout {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .team-figure {
    max-width: 360px;
  }
}

@media (max-width: 860px) {
  .page-about .about-rail {
    position: static;
    top: auto;
  }

  .page-about .about-rail-list {
    display: flex;
    gap: 8px;
    overflow-x: auto;
    border-left: 0;
    padding-bottom: 8px;
    -webkit-overflow-scrolling: touch;
  }

  .page-about .about-rail-list li {
    flex: 0 0 auto;
  }

  .page-about .about-rail-list a {
    white-space: nowrap;
    margin-left: 0;
    padding: 7px 13px;
    border-left: 0;
    border-bottom: 2px solid transparent;
    border-radius: 999px;
    background: rgba(35, 26, 18, .06);
  }

  .page-about .about-rail-list a:hover,
  .page-about .about-rail-list a:focus-visible {
    border-left-color: transparent;
    border-bottom-color: var(--orange-500);
  }

  .page-about .about-hero-side .vertical-note {
    writing-mode: horizontal-tb;
    max-height: none;
    letter-spacing: .14em;
  }

  .page-about .about-hero-svg {
    display: none;
  }
}

@media (max-width: 640px) {
  .page-about .benefit-cards {
    grid-template-columns: minmax(0, 1fr);
  }

  .page-about .about-stats {
    grid-template-columns: minmax(0, 1fr);
    gap: 16px;
  }

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

  .page-about .scope-row,
  .page-about .cadence-row {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }

  .page-about .timeline {
    padding-left: 20px;
  }

  .page-about .tl-item::before {
    left: -20px;
  }

  .page-about .about-quote {
    padding: 16px 16px;
    border-left-width: 5px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .benefit-card,
  .page-about .benefit-head::after,
  .page-about .tl-item::before,
  .page-about .tl-ver,
  .page-about .about-rail-list a {
    transition: none;
  }

  .page-about .tl-item:hover::before {
    transform: none;
  }
}