.page-about {
  --about-hair: rgba(35, 43, 92, 0.16);
  --about-hair-strong: rgba(35, 43, 92, 0.28);
  --about-hair-c: rgba(169, 118, 44, 0.45);
  --about-card: #FFFFFF;
  background: var(--paper-50);
  color: var(--graphite-700);
  font-family: var(--font-body);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  max-width: 1440px;
  margin: 0 auto;
  padding: 104px var(--gutter) 0;
}

.page-about .about-crumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--slate-400);
}

.page-about .about-crumb__list a {
  color: var(--indigo-500);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-crumb__list a:hover {
  color: var(--copper-600);
  border-bottom-color: var(--hairline-copper);
}

.page-about .about-crumb__sep {
  color: var(--copper-400);
}

.page-about .about-crumb__item[aria-current="page"] {
  color: var(--graphite-700);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  max-width: 1440px;
  margin: 0 auto;
  padding: clamp(28px, 4.5vw, 52px) var(--gutter) clamp(44px, 7vw, 88px);
}

.page-about .about-hero__title {
  margin: 18px 0 0;
  max-width: 22ch;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(1.85rem, 6.2vw, 3.85rem);
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ink-900);
}

.page-about .about-hero__title em {
  display: block;
  font-style: normal;
  color: var(--indigo-700);
}

.page-about .about-hero__title em::after {
  content: "";
  display: block;
  width: 76px;
  height: 3px;
  margin-top: 20px;
  border-radius: 2px;
  background: var(--copper-400);
}

.page-about .about-hero__lede {
  max-width: 68ch;
  margin: 26px 0 0;
}

.page-about .about-hero__facts {
  display: flex;
  flex-wrap: wrap;
  gap: 20px clamp(24px, 5vw, 56px);
  margin: clamp(30px, 5vw, 48px) 0 0;
  padding: 22px 0 0;
  list-style: none;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .about-fact__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.3rem, 4vw, 1.7rem);
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--copper-600);
}

.page-about .about-fact__text {
  font-size: var(--fs-14);
  color: var(--slate-400);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-section {
  max-width: 1440px;
  margin: 0 auto;
  padding: clamp(46px, 7vw, 92px) var(--gutter);
}

.page-about .about-section--tint {
  max-width: none;
  background: var(--indigo-100);
}

.page-about .about-section--tint > * {
  max-width: 1440px;
  margin-left: auto;
  margin-right: auto;
}

.page-about .about-path__lede,
.page-about .about-team__lede,
.page-about .about-mobile__lede,
.page-about .about-reach__lede {
  max-width: 60ch;
  margin-top: 16px;
}

/* ---------- 我们做什么 ---------- */
.page-about .about-what__grid {
  display: grid;
  gap: clamp(28px, 5vw, 56px);
  align-items: start;
}

.page-about .about-what__figure {
  order: -1;
  margin: 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--about-hair-c);
  box-shadow: var(--shadow-m);
}

.page-about .about-scenes {
  display: grid;
  gap: 0;
  margin: clamp(26px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-scene {
  padding: 15px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-scene:last-child {
  border-bottom: 1px solid var(--about-hair);
}

.page-about .about-scene__k {
  display: block;
  margin-bottom: 5px;
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.08em;
  color: var(--copper-600);
}

.page-about .about-scene__v {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.7;
  color: var(--graphite-700);
}

/* ---------- 发展历程 ---------- */
.page-about .about-path__figure {
  margin: clamp(28px, 5vw, 46px) auto 0;
  border-radius: var(--radius-m);
  overflow: hidden;
  border: 1px solid var(--about-hair-c);
  box-shadow: var(--shadow-s);
  background: var(--paper-50);
}

.page-about .about-timeline {
  position: relative;
  max-width: 1000px;
  margin: clamp(32px, 5vw, 54px) auto 0;
  padding: 0;
  list-style: none;
}

.page-about .about-tl {
  position: relative;
  padding: 0 0 30px 30px;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 0;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--copper-400);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.18);
}

.page-about .about-tl::after {
  content: "";
  position: absolute;
  left: 5px;
  top: 26px;
  bottom: 0;
  width: 1px;
  background: var(--about-hair-c);
}

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

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

.page-about .about-tl__year {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: var(--fs-18);
  letter-spacing: 0.06em;
  color: var(--copper-600);
}

.page-about .about-tl__card {
  background: var(--about-card);
  border: 1px solid var(--about-hair);
  border-radius: var(--radius-m);
  padding: 18px 20px;
  box-shadow: var(--shadow-s);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-tl__card:hover {
  transform: translateY(-2px);
  border-color: var(--about-hair-c);
  box-shadow: var(--shadow-m);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: var(--fs-18);
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink-900);
}

.page-about .about-tl__body {
  margin: 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: var(--graphite-700);
}

/* ---------- 团队 ---------- */
.page-about .about-bubbles {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  gap: clamp(12px, 3vw, 26px);
  margin: clamp(30px, 5vw, 46px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-bubble {
  display: grid;
  place-content: center;
  flex: 0 0 auto;
  width: var(--d);
  height: var(--d);
  border-radius: 50%;
  text-align: center;
  color: var(--paper-50);
  border: 1px solid var(--about-hair-c);
  box-shadow: var(--shadow-s);
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease);
}

.page-about .about-bubble:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-l);
}

.page-about .about-bubble--a {
  --d: clamp(94px, 26vw, 134px);
  background: var(--indigo-700);
}

.page-about .about-bubble--b {
  --d: clamp(84px, 23vw, 118px);
  background: var(--indigo-500);
}

.page-about .about-bubble--c {
  --d: clamp(78px, 21vw, 108px);
  background: var(--copper-600);
}

.page-about .about-bubble--d {
  --d: clamp(72px, 19vw, 98px);
  background: var(--ink-900);
}

.page-about .about-bubble__n {
  display: block;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.25rem, 4.6vw, 1.75rem);
  line-height: 1;
  letter-spacing: 0.02em;
}

.page-about .about-bubble__r {
  display: block;
  margin-top: 7px;
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
}

.page-about .about-team__note {
  max-width: 72ch;
  margin: clamp(28px, 4vw, 40px) 0 0;
  padding-left: 18px;
  border-left: 3px solid var(--copper-400);
  font-size: var(--fs-16);
  line-height: 1.85;
  color: var(--graphite-700);
}

/* ---------- 手机端汇总 ---------- */
.page-about .about-mobile__grid {
  display: grid;
  gap: clamp(28px, 5vw, 54px);
  align-items: start;
}

.page-about .about-mobile__figure {
  margin: 0;
  border-radius: var(--radius-l);
  overflow: hidden;
  border: 1px solid var(--about-hair-c);
  box-shadow: var(--shadow-m);
  background: var(--paper-50);
}

.page-about .about-folds {
  display: grid;
  gap: 10px;
  max-width: 42rem;
  margin: clamp(26px, 4vw, 38px) 0 0;
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-reach__grid {
  display: grid;
  gap: clamp(28px, 5vw, 54px);
  align-items: start;
}

.page-about .about-reach__link {
  margin: clamp(22px, 3vw, 30px) 0 0;
}

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

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: clamp(18px, 3.2vw, 28px);
  background: var(--about-card);
}

.page-about .about-stat__num {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(1.75rem, 6vw, 2.6rem);
  line-height: 1;
  letter-spacing: -0.01em;
  color: var(--indigo-700);
}

.page-about .about-stat__unit {
  font-size: var(--fs-14);
  font-weight: 600;
  color: var(--copper-600);
}

.page-about .about-stat__desc {
  font-size: var(--fs-14);
  line-height: 1.6;
  color: var(--slate-400);
}

/* ---------- 尾段行动区 ---------- */
.page-about .about-cta__panel {
  display: grid;
  gap: 26px;
  padding: clamp(26px, 5vw, 46px);
  background: var(--ink-900);
  border: 1px solid rgba(201, 162, 39, 0.32);
  border-radius: var(--radius-l);
}

.page-about .about-cta__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.35rem, 4.2vw, 1.9rem);
  line-height: 1.35;
  letter-spacing: -0.01em;
  color: var(--paper-50);
}

.page-about .about-cta__text {
  max-width: 46ch;
  margin: 12px 0 0;
  font-size: var(--fs-16);
  line-height: 1.75;
  color: rgba(247, 245, 240, 0.76);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 14px 22px;
}

.page-about .about-cta__link {
  font-size: var(--fs-14);
  letter-spacing: 0.04em;
  color: var(--paper-50);
  text-decoration: none;
  border-bottom: 1px solid rgba(201, 162, 39, 0.6);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-cta__link:hover {
  color: var(--copper-400);
  border-bottom-color: var(--copper-400);
}

.page-about .eyebrow--light {
  color: var(--copper-400);
}

/* ---------- 图片自适应 ---------- */
.page-about img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

/* ---------- 断点 ---------- */
@media (min-width: 768px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 0 clamp(24px, 4vw, 44px);
  }

  .page-about .about-scene:last-child {
    border-bottom: 0;
  }

  .page-about .about-scene:nth-last-child(2) {
    border-bottom: 1px solid var(--about-hair);
  }
}

@media (min-width: 900px) {
  .page-about .about-what__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-what__figure {
    order: 0;
    position: sticky;
    top: 108px;
  }

  .page-about .about-mobile__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-mobile__figure {
    grid-column: 1;
    grid-row: 1;
    position: sticky;
    top: 108px;
  }

  .page-about .about-mobile__col {
    grid-column: 2;
    grid-row: 1;
  }

  .page-about .about-reach__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1fr) auto;
    align-items: center;
    gap: 34px;
  }

  .page-about .about-cta__actions {
    flex-direction: column;
    align-items: flex-start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-timeline {
    max-width: 1080px;
  }

  .page-about .about-tl {
    display: grid;
    grid-template-columns: 9rem minmax(0, 1fr);
    gap: 0 2.5rem;
    padding: 0 0 34px 0;
  }

  .page-about .about-tl::before,
  .page-about .about-tl::after {
    display: none;
  }

  .page-about .about-tl__year {
    margin-bottom: 0;
    padding: 4px 1.4rem 0 0;
    border-right: 1px solid var(--about-hair-c);
    text-align: right;
    font-size: var(--fs-32);
    line-height: 1.1;
  }

  .page-about .about-tl__card {
    padding: 22px 26px;
  }

  .page-about .about-tl__title {
    font-size: var(--fs-24);
  }

  .page-about .about-bubbles {
    gap: 30px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-scenes {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

@media (max-width: 480px) {
  .page-about .about-crumb {
    padding-top: 92px;
  }

  .page-about .about-hero__title em::after {
    margin-top: 16px;
  }

  .page-about .about-stat {
    padding: 16px;
  }

  .page-about .about-bubbles {
    gap: 12px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tl__card,
  .page-about .about-bubble,
  .page-about .about-cta__link {
    transition: opacity 0.12s linear;
    transform: none;
  }

  .page-about .about-tl__card:hover,
  .page-about .about-bubble:hover {
    transform: none;
  }
}