.page-about {
  --about-rule: 2px solid var(--ink);
  --about-gap: clamp(28px, 6vw, 72px);
  position: relative;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumbs {
  padding: clamp(16px, 3vw, 28px) 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(32px, 6vw, 72px) 0 clamp(56px, 9vw, 120px);
  border-bottom: var(--about-rule);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(var(--gravel) 1px, transparent 1px),
    linear-gradient(90deg, var(--gravel) 1px, transparent 1px);
  background-size: 72px 72px;
  opacity: 0.42;
  pointer-events: none;
  -webkit-mask-image: radial-gradient(circle at 78% 26%, #000 0%, transparent 68%);
  mask-image: radial-gradient(circle at 78% 26%, #000 0%, transparent 68%);
}

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

.page-about .about-hero__ghost {
  position: absolute;
  right: clamp(-20px, -1vw, 0px);
  bottom: clamp(8px, 2vw, 32px);
  font-size: clamp(3.4rem, 13vw, 11rem);
  font-weight: 300;
  line-height: 0.85;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--gravel);
  pointer-events: none;
  user-select: none;
  z-index: 0;
}

.page-about .about-hero__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  margin-bottom: clamp(20px, 4vw, 40px);
}

.page-about .about-hero__stamp {
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--graphite);
  border: 1px solid var(--gravel);
  padding: 4px 10px;
}

.page-about .about-hero__title {
  margin: 0 0 clamp(28px, 5vw, 56px);
  max-width: 16ch;
}

.page-about .about-hero__body {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 52ch;
  font-size: clamp(1rem, 1.05vw + 0.8rem, 1.2rem);
  line-height: 1.8;
  color: var(--ink);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ink);
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
}

.page-about .about-hero__stats li {
  background: var(--paper);
  padding: clamp(14px, 2.4vw, 22px) clamp(12px, 2vw, 20px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__num {
  font-size: clamp(1.7rem, 3.6vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  border-bottom: 2px solid var(--blue);
  padding-bottom: 4px;
  align-self: flex-start;
}

.page-about .about-hero__cap {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--graphite);
}

/* ---------- 章节目录 ---------- */
.page-about .about-toc {
  position: sticky;
  top: 0;
  z-index: 20;
  background: var(--paper);
  border-bottom: var(--about-rule);
}

.page-about .about-toc__inner {
  padding-top: 14px;
  padding-bottom: 14px;
}

.page-about .about-toc__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  gap: clamp(16px, 3vw, 34px);
  overflow-x: auto;
  scrollbar-width: none;
  -webkit-overflow-scrolling: touch;
}

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

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

.page-about .about-toc__list a {
  display: inline-flex;
  align-items: baseline;
  gap: 8px;
  padding-bottom: 6px;
  font-size: 13px;
  color: var(--graphite);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  white-space: nowrap;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-toc__num {
  font-size: 11px;
  font-variant-numeric: tabular-nums;
  color: var(--blue);
  font-weight: 700;
}

.page-about .about-toc__list a:hover,
.page-about .about-toc__list a[aria-current="true"] {
  color: var(--ink);
  border-bottom-color: var(--blue);
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(64px, 9vw, 128px) 0;
  border-bottom: 1px solid var(--gravel);
}

.page-about .about-section:last-of-type {
  border-bottom: 0;
}

.page-about .about-section__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 4vw, 40px);
}

.page-about .about-section__num {
  font-size: clamp(2.6rem, 9vw, 5.2rem);
  font-weight: 300;
  line-height: 0.9;
  letter-spacing: -0.04em;
  font-variant-numeric: tabular-nums;
  color: var(--blue);
  opacity: 0.9;
}

.page-about .about-section__title {
  margin: 0 0 clamp(16px, 3vw, 28px);
  font-size: clamp(1.7rem, 3.4vw, 2.6rem);
  font-weight: 700;
  line-height: 1.15;
  letter-spacing: -0.01em;
}

.page-about .about-section__prose p {
  margin: 0 0 1.2em;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--ink);
  max-width: 62ch;
}

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

.page-about .about-section__prose a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 2px solid var(--blue);
  padding-bottom: 1px;
}

.page-about .about-section__prose a:hover {
  background: var(--blue);
  color: var(--paper);
}

/* 说明牌 */
.page-about .about-note {
  border: var(--about-rule);
  background: var(--paper);
  box-shadow: 6px 6px 0 var(--ink);
  padding: clamp(18px, 3vw, 26px);
}

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

.page-about .about-note--peach {
  background: var(--peach);
}

.page-about .about-note__index {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--graphite);
  border-bottom: 2px solid var(--ink);
  padding-bottom: 10px;
}

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

.page-about .about-note__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.page-about .about-note__list li {
  position: relative;
  padding-left: 18px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
}

.page-about .about-note__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 8px;
  height: 2px;
  background: var(--blue);
}

.page-about .about-note__facts {
  margin: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-note__facts dt {
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--graphite);
}

.page-about .about-note__facts dd {
  margin: 2px 0 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--ink);
  border-left: 2px solid var(--grass);
  padding-left: 10px;
}

/* ---------- 02 覆盖 ---------- */
.page-about .about-area__figure {
  margin: clamp(24px, 4vw, 44px) 0 0;
}

.page-about .about-area__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  background: var(--mint);
  object-fit: cover;
}

.page-about .about-area__caption {
  margin-top: 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--graphite);
}

.page-about .about-area__splits {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--ink);
  border: var(--about-rule);
  margin-top: clamp(28px, 4vw, 44px);
}

.page-about .about-area__split {
  background: var(--paper);
  padding: clamp(20px, 3.4vw, 32px);
}

.page-about .about-area__split-num {
  display: inline-block;
  font-size: clamp(2.2rem, 5vw, 3.4rem);
  font-weight: 700;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.03em;
  border-bottom: 3px solid var(--blue);
  padding-bottom: 6px;
  margin-bottom: 14px;
}

.page-about .about-area__split-title {
  margin: 0 0 8px;
  font-size: 1.05rem;
  font-weight: 700;
}

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

/* ---------- 03 团队 ---------- */
.page-about .team-bars {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}

.page-about .team-bar {
  display: grid;
  grid-template-columns: minmax(120px, 168px) 1fr auto;
  align-items: center;
  gap: 14px;
}

.page-about .team-bar__label {
  font-size: 13px;
  color: var(--ink);
}

.page-about .team-bar__track {
  position: relative;
  height: 22px;
  border: var(--about-rule);
  background: var(--paper);
  overflow: hidden;
}

.page-about .team-bar__fill {
  display: block;
  height: 100%;
  background: var(--blue);
  border-right: 2px solid var(--ink);
}

.page-about .team-bar--18 .team-bar__fill { width: 100%; background: var(--blue); }
.page-about .team-bar--11 .team-bar__fill { width: 61%; background: var(--grass); }
.page-about .team-bar--9  .team-bar__fill { width: 50%; background: var(--blue); }
.page-about .team-bar--4  .team-bar__fill { width: 22%; background: var(--amber); }

.page-about .team-bar__value {
  font-size: 1.15rem;
  font-weight: 700;
  font-variant-numeric: tabular-nums;
  min-width: 2.2ch;
  text-align: right;
}

.page-about .about-team__figure {
  margin: clamp(32px, 5vw, 52px) 0 0;
}

.page-about .about-team__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--about-rule);
  box-shadow: 8px 8px 0 var(--grass);
  object-fit: cover;
}

/* ---------- 04 发展历程 ---------- */
.page-about .about-section--history {
  background: var(--paper);
}

.page-about .timeline {
  list-style: none;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 0;
  border-left: 2px solid var(--grass);
  padding-left: clamp(20px, 4vw, 34px);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(28px, 4vw, 40px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: calc(-1 * clamp(20px, 4vw, 34px) - 7px);
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--blue);
  border: 2px solid var(--paper);
}

.page-about .timeline__item--current::before {
  background: var(--amber);
}

.page-about .timeline__year {
  display: inline-block;
  font-size: clamp(1.5rem, 3.2vw, 2.2rem);
  font-weight: 300;
  line-height: 1;
  font-variant-numeric: tabular-nums;
  letter-spacing: -0.02em;
  border-bottom: 2px solid var(--blue);
  padding-bottom: 4px;
  margin-bottom: 12px;
}

.page-about .timeline__title {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 700;
}

.page-about .timeline__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--graphite);
  max-width: 46ch;
}

.page-about .about-history__figure {
  margin: clamp(28px, 4vw, 44px) 0 0;
}

.page-about .about-history__figure img {
  display: block;
  width: 100%;
  height: auto;
  border: var(--about-rule);
  box-shadow: var(--shadow-hard);
  object-fit: cover;
}

/* ---------- 05 服务承诺 ---------- */
.page-about .promise-grid {
  list-style: none;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about .promise-card {
  border: var(--about-rule);
  background: var(--paper);
  padding: clamp(20px, 3vw, 28px);
  box-shadow: 6px 6px 0 var(--gravel);
  transition: transform 0.24s var(--ease), box-shadow 0.24s var(--ease);
}

.page-about .promise-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--ink);
}

.page-about .promise-card__index {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--graphite);
  border: 1px solid var(--gravel);
  padding: 3px 9px;
  margin-bottom: 14px;
}

.page-about .promise-card__title {
  margin: 0 0 8px;
  font-size: 1.15rem;
  font-weight: 700;
}

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

/* ---------- 07 面板 ---------- */
.page-about .about-section--panel {
  background: var(--night);
  color: var(--paper);
  border-bottom: 0;
}

.page-about .about-section--panel .about-section__num {
  color: var(--grass);
}

.page-about .about-section--panel .about-section__title {
  color: var(--paper);
}

.page-about .about-section--panel .about-section__prose p {
  color: var(--gravel);
}

.page-about .about-section--panel .about-section__prose a {
  color: var(--paper);
  border-bottom-color: var(--grass);
}

.page-about .about-section--panel .about-section__prose a:hover {
  background: var(--grass);
  color: var(--night);
}

.page-about .about-section--panel .about-note {
  background: transparent;
  border-color: var(--gravel);
  box-shadow: 6px 6px 0 var(--blue);
}

.page-about .about-section--panel .about-note__index {
  color: var(--gravel);
  border-bottom-color: var(--gravel);
}

.page-about .about-section--panel .about-note__list li {
  color: var(--paper);
}

.page-about .about-section--panel .about-note__list li::before {
  background: var(--grass);
}

.page-about .panel-blocks {
  list-style: none;
  margin: clamp(28px, 4vw, 48px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--gravel);
  border: 1px solid var(--gravel);
}

.page-about .panel-block {
  background: var(--night);
  padding: clamp(18px, 3vw, 26px);
}

.page-about .panel-block__num {
  display: inline-block;
  font-size: 11px;
  font-weight: 700;
  letter-spacing: 0.2em;
  color: var(--night);
  background: var(--grass);
  padding: 3px 9px;
  margin-bottom: 12px;
}

.page-about .panel-block__title {
  margin: 0 0 6px;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--paper);
}

.page-about .panel-block p {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--gravel);
}

.page-about .about-cta {
  margin-top: clamp(32px, 5vw, 52px);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px;
}

.page-about .about-cta__text {
  flex: 1 1 260px;
  margin: 0 0 4px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--gravel);
}

.page-about .about-cta .btn {
  flex: 0 0 auto;
}

/* ---------- 响应式：桌面 ---------- */
@media (min-width: 760px) {
  .page-about .about-area__splits {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

  .page-about .about-toc__inner {
    padding-top: 16px;
    padding-bottom: 16px;
  }
}

@media (min-width: 1000px) {
  .page-about .about-hero__body {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    gap: clamp(40px, 6vw, 88px);
  }

  .page-about .about-section__grid {
    grid-template-columns: minmax(72px, 128px) minmax(0, 1fr) minmax(220px, 290px);
    gap: clamp(28px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-section__num {
    position: sticky;
    top: 96px;
  }

  .page-about .timeline {
    border-left: 0;
    padding-left: 0;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    position: relative;
  }

  .page-about .timeline::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 6px;
    height: 2px;
    background: var(--grass);
  }

  .page-about .timeline__item {
    padding: 0 clamp(16px, 2vw, 28px) 0 0;
  }

  .page-about .timeline__item::before {
    left: 0;
    top: 0;
    width: 14px;
    height: 14px;
    border-color: var(--paper);
    background: var(--blue);
    box-shadow: 0 0 0 2px var(--paper);
  }

  .page-about .timeline__item--current::before {
    background: var(--amber);
  }

  .page-about .timeline__year {
    display: block;
    margin-top: 26px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .promise-card,
  .page-about .about-toc__list a {
    transition: none;
  }

  .page-about .promise-card:hover {
    transform: none;
  }
}