.page-about {
  --about-line: rgba(14, 27, 51, 0.14);
  --about-line-dark: rgba(247, 243, 236, 0.18);
  --about-paper-soft: rgba(247, 243, 236, 0.72);
  background: var(--paper);
  color: var(--ink-mid);
  font-family: var(--sans);
  -webkit-font-smoothing: antialiased;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  font-family: var(--mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--stone);
}

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

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

.page-about .breadcrumb__sep {
  opacity: 0.55;
}

/* ---------- HERO ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(22px, 4vw, 44px) clamp(46px, 7vw, 92px);
  background: linear-gradient(148deg, var(--ink-soft) 0%, var(--ink) 46%, var(--ink-deep) 100%);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -30%;
  right: -10%;
  width: min(52vw, 580px);
  aspect-ratio: 1 / 1;
  background: linear-gradient(140deg, rgba(180, 122, 60, 0.32), rgba(180, 122, 60, 0) 68%);
  transform: rotate(16deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "2012";
  position: absolute;
  right: clamp(-14px, 1.6vw, 36px);
  bottom: -0.18em;
  font-family: var(--mono);
  font-size: clamp(110px, 21vw, 300px);
  line-height: 0.78;
  letter-spacing: -0.03em;
  color: rgba(247, 243, 236, 0.055);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: flex;
  flex-direction: column;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .about-hero .breadcrumb,
.page-about .about-hero .breadcrumb a {
  color: rgba(247, 243, 236, 0.62);
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--copper-light);
  border-bottom-color: var(--copper-light);
}

.page-about .about-hero__kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--copper-light);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 15em;
  font-family: var(--serif);
  font-weight: 300;
  font-size: clamp(36px, 6.4vw, 78px);
  line-height: 1.08;
  letter-spacing: -0.012em;
  color: var(--paper);
}

.page-about .about-hero__lede {
  margin: 0;
  max-width: 34em;
  font-size: clamp(15px, 1.3vw, 17px);
  line-height: 1.85;
  color: rgba(247, 243, 236, 0.76);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: clamp(16px, 3vw, 32px);
  margin: clamp(14px, 2.4vw, 26px) 0 0;
  padding: 0;
  list-style: none;
  max-width: 900px;
}

.page-about .about-hero__stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding-left: 14px;
  border-left: 2px solid var(--copper);
}

.page-about .about-hero__num {
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 500;
  line-height: 1.1;
  color: var(--paper);
  letter-spacing: 0.01em;
}

.page-about .about-hero__label {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: rgba(247, 243, 236, 0.6);
}

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

/* ---------- 共享小节头 ---------- */

.page-about .about-head {
  max-width: 780px;
  margin-bottom: clamp(28px, 4.4vw, 52px);
}

.page-about .about-head .h2 {
  margin-top: 6px;
  color: var(--ink);
}

.page-about .about-head .lede {
  max-width: 40em;
  margin-top: 14px;
  color: var(--ink-mid);
}

/* ---------- 时间轴 ---------- */

.page-about .about-timeline {
  background: var(--paper);
}

.page-about .tl {
  display: grid;
  gap: clamp(26px, 3.4vw, 44px);
}

.page-about .tl__item {
  position: relative;
  padding-left: 22px;
}

.page-about .tl__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 0;
  width: 1px;
  background: linear-gradient(180deg, var(--copper) 0%, var(--about-line) 62%, rgba(14, 27, 51, 0) 100%);
}

.page-about .tl__item::after {
  content: "";
  position: absolute;
  left: -3.5px;
  top: 8px;
  width: 8px;
  height: 8px;
  background: var(--paper);
  border: 1px solid var(--copper);
  transform: rotate(45deg);
}

.page-about .tl__year {
  margin: 0 0 10px;
  font-size: clamp(17px, 2.4vw, 24px);
  font-weight: 500;
  letter-spacing: 0.03em;
  line-height: 1;
  color: var(--copper);
}

.page-about .tl__title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--ink);
}

.page-about .tl__text {
  margin: 0 0 14px;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-mid);
}

.page-about .tl__figure {
  margin: 18px 0 18px;
  max-width: 640px;
}

@media (min-width: 860px) {
  .page-about .tl__item {
    display: grid;
    grid-template-columns: 140px minmax(0, 1fr);
    padding-left: 0;
  }

  .page-about .tl__item::before {
    left: 140px;
    top: 10px;
  }

  .page-about .tl__item::after {
    left: 136px;
    top: 13px;
  }

  .page-about .tl__year {
    margin: 0;
    padding-right: 18px;
    text-align: right;
    font-size: clamp(20px, 2.2vw, 26px);
  }

  .page-about .tl__body {
    padding-left: clamp(24px, 3.2vw, 52px);
  }
}

/* ---------- 通用展开件 ---------- */

.page-about .expand-btn {
  display: inline-flex;
  align-items: center;
  gap: 9px;
  margin-top: 4px;
  padding: 8px 16px;
  font-family: var(--sans);
  font-size: 13px;
  letter-spacing: 0.06em;
  color: inherit;
  background: transparent;
  border: 1px solid currentColor;
  border-radius: 0;
  opacity: 0.78;
  cursor: pointer;
  transition: opacity 0.2s var(--ease), color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .expand-btn::after {
  content: "+";
  font-family: var(--mono);
  font-size: 15px;
  line-height: 1;
}

.page-about .expand-btn:hover {
  opacity: 1;
  color: var(--copper);
  border-color: var(--copper);
}

.page-about .expand-btn:focus-visible {
  outline: 2px solid var(--copper);
  outline-offset: 3px;
  opacity: 1;
}

.page-about .expand-btn[aria-expanded="true"]::after {
  content: "–";
}

.page-about .expand-panel {
  margin-top: 16px;
  padding: 16px 0 4px 18px;
  border-left: 2px solid var(--copper-light);
}

.page-about .expand-panel p {
  margin: 0;
  max-width: 40em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--stone);
}

/* ---------- 业务线 ---------- */

.page-about .about-lines {
  background: var(--ink);
  color: rgba(247, 243, 236, 0.76);
}

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

.page-about .about-lines .about-head .h2 {
  color: var(--paper);
}

.page-about .about-lines .about-head .lede {
  color: rgba(247, 243, 236, 0.74);
}

.page-about .lines {
  display: grid;
  gap: 1px;
  background: var(--about-line-dark);
  border: 1px solid var(--about-line-dark);
}

.page-about .lines__item {
  position: relative;
  padding: clamp(22px, 3vw, 36px);
  background: linear-gradient(158deg, var(--ink-mid) 0%, var(--ink-deep) 100%);
  transition: background 0.3s var(--ease);
}

.page-about .lines__item:hover {
  background: linear-gradient(158deg, var(--ink-soft) 0%, var(--ink) 100%);
}

.page-about .lines__num {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--copper);
}

.page-about .lines__title {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: clamp(19px, 2.2vw, 24px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .lines__text {
  margin: 0 0 14px;
  font-size: 14.5px;
  line-height: 1.85;
  color: rgba(247, 243, 236, 0.72);
}

.page-about .lines__item .expand-btn {
  color: rgba(247, 243, 236, 0.7);
}

.page-about .lines__item .expand-btn:hover {
  color: var(--copper-light);
  border-color: var(--copper-light);
}

.page-about .lines__item .expand-panel p {
  color: rgba(247, 243, 236, 0.62);
}

.page-about .about-lines__link {
  margin: clamp(26px, 3.6vw, 44px) 0 0;
}

.page-about .about-lines__link .link-arrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-family: var(--mono);
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--copper-light);
  text-decoration: none;
  border-bottom: 1px solid rgba(217, 175, 121, 0.4);
  padding-bottom: 4px;
  transition: gap 0.24s var(--ease), border-color 0.24s var(--ease);
}

.page-about .about-lines__link .link-arrow:hover {
  gap: 16px;
  border-bottom-color: var(--copper-light);
}

@media (min-width: 760px) {
  .page-about .lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: var(--paper-soft);
}

.page-about .team__grid {
  display: grid;
  gap: clamp(26px, 4vw, 54px);
  align-items: start;
}

.page-about .team__groups {
  display: grid;
  gap: clamp(18px, 2.4vw, 26px);
}

.page-about .team-group {
  padding-top: 18px;
  border-top: 1px solid var(--about-line);
}

.page-about .team-group__num {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--copper);
}

.page-about .team-group__title {
  margin: 0 0 10px;
  font-family: var(--serif);
  font-size: clamp(18px, 2.1vw, 22px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .team-group__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-mid);
}

.page-about .team__figure {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .team__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

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

/* ---------- 图片容器 ---------- */

.page-about .about-figure {
  position: relative;
  overflow: hidden;
  background: var(--paper-soft);
  border: 1px solid var(--about-line);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  filter: saturate(0.7) contrast(1.03);
}

.page-about .about-figure--3x2 {
  aspect-ratio: 3 / 2;
}

.page-about .about-figure--4x3 {
  aspect-ratio: 4 / 3;
}

.page-about .about-figure__cap {
  position: absolute;
  left: 0;
  bottom: 0;
  padding: 7px 12px;
  font-size: 10px;
  letter-spacing: 0.14em;
  color: var(--paper);
  background: rgba(14, 27, 51, 0.82);
}

/* ---------- 流程 ---------- */

.page-about .about-process {
  background: var(--paper);
}

.page-about .flow {
  display: grid;
  gap: clamp(20px, 2.6vw, 30px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .flow__item {
  position: relative;
  padding-top: 26px;
  border-top: 1px solid var(--about-line);
}

.page-about .flow__item::before {
  content: "";
  position: absolute;
  top: -4px;
  left: 0;
  width: 7px;
  height: 7px;
  background: var(--copper);
  transform: rotate(45deg);
}

.page-about .flow__num {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.18em;
  color: var(--copper);
}

.page-about .flow__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .flow__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-mid);
}

.page-about .process__note {
  margin-top: clamp(28px, 4vw, 46px);
  padding: clamp(18px, 2.4vw, 26px);
  background: var(--paper-soft);
  border-left: 3px solid var(--copper);
}

.page-about .process__note p {
  margin: 0;
  max-width: 60em;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--ink-mid);
}

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

/* ---------- 合作生态 ---------- */

.page-about .about-eco {
  background: var(--warm-gray);
}

.page-about .eco__grid {
  display: grid;
  gap: clamp(26px, 4vw, 56px);
  align-items: start;
}

.page-about .eco__body .h2 {
  margin-top: 6px;
  color: var(--ink);
}

.page-about .eco__body .lede {
  max-width: 40em;
  margin-top: 14px;
  color: var(--ink-mid);
}

.page-about .eco__stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: clamp(14px, 2.4vw, 28px);
  margin: clamp(24px, 3.4vw, 38px) 0;
  padding: 0;
}

.page-about .eco__stat {
  padding-top: 12px;
  border-top: 1px solid rgba(14, 27, 51, 0.28);
}

.page-about .eco__stat dt {
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--stone);
  margin-bottom: 6px;
}

.page-about .eco__stat dd {
  margin: 0;
  font-size: clamp(20px, 2.6vw, 28px);
  font-weight: 500;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.page-about .eco__text {
  margin: 0;
  max-width: 40em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-mid);
}

.page-about .eco__figure {
  margin: 0;
}

@media (min-width: 900px) {
  .page-about .eco__grid {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
  }
}

/* ---------- 服务原则 ---------- */

.page-about .about-principles {
  background: var(--ink-deep);
  color: rgba(247, 243, 236, 0.76);
}

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

.page-about .about-principles .about-head .h2 {
  color: var(--paper);
}

.page-about .about-principles .about-head .lede {
  color: rgba(247, 243, 236, 0.74);
}

.page-about .steps {
  display: grid;
  gap: clamp(20px, 3vw, 34px);
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .steps__item {
  position: relative;
  padding-top: 22px;
}

.page-about .steps__item::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, var(--copper) 0%, rgba(217, 175, 121, 0.1) 100%);
}

.page-about .steps__num {
  display: block;
  margin-bottom: 12px;
  font-size: clamp(22px, 2.8vw, 32px);
  font-weight: 500;
  line-height: 1;
  color: var(--copper-light);
}

.page-about .steps__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: clamp(17px, 1.9vw, 20px);
  font-weight: 600;
  line-height: 1.4;
  color: var(--paper);
}

.page-about .steps__text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(247, 243, 236, 0.68);
}

.page-about .principles-facts {
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
  margin: clamp(32px, 4.4vw, 54px) 0 0;
  padding: clamp(20px, 2.6vw, 30px) 0 0;
  list-style: none;
  border-top: 1px solid var(--about-line-dark);
}

.page-about .principles-facts__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .principles-facts__num {
  font-size: clamp(22px, 2.8vw, 30px);
  font-weight: 500;
  line-height: 1.1;
  color: var(--copper-light);
}

.page-about .principles-facts__label {
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(247, 243, 236, 0.62);
}

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

@media (min-width: 900px) {
  .page-about .steps {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: clamp(16px, 2vw, 24px);
  }
}

/* ---------- 收尾 ---------- */

.page-about .about-cta {
  background: var(--paper);
  border-top: 1px solid var(--about-line);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(24px, 3.6vw, 44px);
  align-items: start;
}

.page-about .about-cta__body .h2 {
  margin-top: 6px;
  max-width: 16em;
  color: var(--ink);
}

.page-about .about-cta__body .lede {
  max-width: 36em;
  margin-top: 14px;
  color: var(--ink-mid);
}

.page-about .about-cta__side {
  display: flex;
  flex-direction: column;
  gap: 12px;
  align-items: flex-start;
}

.page-about .about-cta__side .btn {
  width: 100%;
  text-align: center;
  text-decoration: none;
}

.page-about .about-cta__contact {
  margin: 10px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--stone);
  letter-spacing: 0.02em;
}

@media (min-width: 860px) {
  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.75fr);
  }

  .page-about .about-cta__side .btn {
    width: auto;
    min-width: 220px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}