.page-about {
  --about-pad: clamp(28px, 5vw, 64px);
  --about-gap: clamp(16px, 2.5vw, 28px);
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 18px 0 0;
  font-size: 0.8rem;
  color: var(--ink-45);
}

.page-about .breadcrumb__item + .breadcrumb__item::before {
  content: "/";
  margin-right: 8px;
  color: var(--ink-12);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding-block: clamp(28px, 4.5vw, 60px) clamp(36px, 6vw, 78px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -14%;
  right: -12%;
  width: min(640px, 78vw);
  aspect-ratio: 1 / 1;
  background: linear-gradient(142deg, var(--red) 0%, var(--orange) 58%, rgba(242, 106, 46, 0) 59%);
  opacity: 0.13;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 20% 100%);
  pointer-events: none;
}

.page-about .about-hero__grid {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-hero__copy h1 {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.85rem, 5.4vw, 3.25rem);
  line-height: 1.14;
  letter-spacing: -0.022em;
  color: var(--ink);
}

.page-about .about-hero__copy .lede {
  margin-top: 16px;
  max-width: 46ch;
  font-size: clamp(0.98rem, 1.9vw, 1.08rem);
  line-height: 1.78;
  color: var(--ink-70);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 16px;
  margin-top: 26px;
}

.page-about .about-hero__link {
  font-size: 0.92rem;
  font-weight: 600;
  color: var(--ink);
  text-decoration: none;
  border-bottom: 2px solid var(--orange);
  padding-bottom: 2px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .about-hero__link:hover,
.page-about .about-hero__link:focus-visible {
  color: var(--red);
  border-color: var(--red);
}

.page-about .about-hero__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
  margin-top: 30px;
  padding-top: 22px;
  border-top: 1px solid var(--line);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 13px 14px;
  background: var(--paper-2);
  border-left: 3px solid var(--orange);
  border-radius: var(--r-sm);
}

.page-about .about-stat:nth-child(2) {
  border-left-color: var(--red);
}

.page-about .about-stat:nth-child(3) {
  border-left-color: var(--teal);
}

.page-about .about-stat:nth-child(4) {
  border-left-color: var(--gold);
}

.page-about .about-stat__num {
  font-size: clamp(1.05rem, 2.4vw, 1.24rem);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-stat__label {
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--ink-45);
}

.page-about .about-hero__media {
  position: relative;
  margin: 0;
  overflow: hidden;
  background: var(--ink);
  border-radius: var(--r-lg);
  box-shadow: var(--shadow-2);
}

.page-about .about-hero__media::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(200deg, rgba(232, 69, 31, 0.22), rgba(16, 28, 44, 0) 46%);
  pointer-events: none;
}

.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-hero__media figcaption {
  position: absolute;
  left: 12px;
  bottom: 12px;
  z-index: 2;
  padding: 5px 10px;
  font-size: 0.72rem;
  letter-spacing: 0.04em;
  color: var(--paper);
  background: rgba(16, 28, 44, 0.74);
  border-radius: var(--r-sm);
}

/* ---------- 章节标题 ---------- */

.page-about .about-chapter {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-chapter__no {
  font-family: var(--font-serif);
  font-size: clamp(2.4rem, 7vw, 4rem);
  line-height: 0.86;
  color: var(--red);
  opacity: 0.85;
}

.page-about .about-chapter h2 {
  margin: 4px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  line-height: 1.24;
  letter-spacing: -0.018em;
  color: var(--ink);
}

.page-about .about-chapter .eyebrow {
  color: var(--orange);
}

/* ---------- 我们是谁 ---------- */

.page-about .about-who__stack {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-card h3 {
  font-family: var(--font-display);
  font-size: 1.06rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-card p {
  line-height: 1.78;
  color: var(--ink-70);
}

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

.page-about .about-who__list li {
  position: relative;
  padding-left: 18px;
  line-height: 1.76;
  color: var(--ink-70);
}

.page-about .about-who__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 8px;
  height: 2px;
  background: var(--red);
}

.page-about .about-who__list strong {
  display: block;
  margin-bottom: 3px;
  color: var(--ink);
  font-weight: 700;
}

/* ---------- 时间线 ---------- */

.page-about .about-timeline__intro {
  max-width: 60ch;
  margin-bottom: clamp(18px, 2.6vw, 28px);
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-timeline__figure {
  margin: 0 0 clamp(26px, 4vw, 44px);
  overflow: hidden;
  border-radius: var(--r-md);
  background: var(--ink);
}

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

.page-about .about-timeline__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 0;
}

.page-about .about-phase {
  position: relative;
  padding: 20px 0 20px 26px;
  border-left: 2px solid var(--line);
}

.page-about .about-phase:last-child {
  border-left-color: var(--red);
}

.page-about .about-phase::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 28px;
  width: 10px;
  height: 10px;
  background: var(--orange);
  transform: rotate(45deg);
}

.page-about .about-phase:nth-child(1)::before { background: var(--red); }
.page-about .about-phase:nth-child(2)::before { background: var(--orange); }
.page-about .about-phase:nth-child(3)::before { background: var(--gold); }
.page-about .about-phase:nth-child(4)::before { background: var(--teal); }
.page-about .about-phase:nth-child(5)::before { background: var(--blue); }

.page-about .about-phase__ver {
  display: inline-block;
  font-size: 0.74rem;
  letter-spacing: 0.06em;
  color: var(--ink-45);
}

.page-about .about-phase h3 {
  margin: 7px 0 0;
  font-family: var(--font-display);
  font-size: 1.06rem;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-phase p {
  margin-top: 8px;
  max-width: 62ch;
  line-height: 1.78;
  color: var(--ink-70);
}

/* ---------- 团队 ---------- */

.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-team__figure {
  margin: 0;
  overflow: hidden;
  border-radius: var(--r-md);
  background: var(--paper-2);
}

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

.page-about .about-team__body > p {
  max-width: 62ch;
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-team__cards {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin-top: 22px;
}

.page-about .about-team__card {
  position: relative;
  padding: 16px 16px 14px;
  background: #ffffff;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  cursor: default;
  transition: transform 0.3s var(--ease), box-shadow 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-team__card:hover,
.page-about .about-team__card:focus-within,
.page-about .about-team__card:focus-visible {
  transform: translateY(-3px);
  border-color: var(--orange);
  box-shadow: var(--shadow-1);
  outline: none;
}

.page-about .about-team__card h3 {
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: -0.008em;
  color: var(--ink);
}

.page-about .about-team__count {
  margin-top: 4px;
  font-size: 0.76rem;
  letter-spacing: 0.06em;
  color: var(--orange);
}

.page-about .about-team__duty {
  max-height: 0;
  margin-top: 0;
  overflow: hidden;
  opacity: 0;
  font-size: 0.9rem;
  line-height: 1.72;
  color: var(--ink-70);
  transition: max-height 0.36s var(--ease), opacity 0.26s var(--ease), margin-top 0.36s var(--ease);
}

.page-about .about-team__card:hover .about-team__duty,
.page-about .about-team__card:focus-within .about-team__duty,
.page-about .about-team__card:focus-visible .about-team__duty {
  max-height: 240px;
  margin-top: 10px;
  opacity: 1;
}

.page-about .about-team__body .note {
  margin-top: 24px;
}

/* ---------- 合作与荣誉 ---------- */

.page-about .about-partners__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-partner h3 {
  margin-top: 12px;
  font-family: var(--font-display);
  font-size: 1.05rem;
  color: #ffffff;
}

.page-about .about-partner p {
  margin-top: 8px;
  font-size: 0.92rem;
  line-height: 1.76;
  color: rgba(246, 241, 231, 0.78);
}

.page-about .about-honors {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: clamp(22px, 3vw, 34px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-honor {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: #ffffff;
  border-left: 3px solid var(--gold);
  border-radius: var(--r-sm);
}

.page-about .about-honor p {
  font-size: 0.94rem;
  line-height: 1.6;
  color: var(--ink);
}

/* ---------- 跨设备回访 ---------- */

.page-about .about-cross__intro {
  max-width: 58ch;
  margin-bottom: clamp(20px, 3vw, 30px);
  line-height: 1.8;
  color: var(--ink-70);
}

.page-about .about-cross__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
}

.page-about .about-cross__item {
  position: relative;
  padding-top: 20px;
  border-top: 2px solid var(--ink);
}

.page-about .about-cross__item:nth-child(2) {
  border-top-color: var(--orange);
}

.page-about .about-cross__item:nth-child(3) {
  border-top-color: var(--teal);
}

.page-about .about-cross__idx {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--ink-45);
}

.page-about .about-cross__item h3 {
  margin-top: 8px;
  font-family: var(--font-display);
  font-size: 1.08rem;
  letter-spacing: -0.012em;
  color: var(--ink);
}

.page-about .about-cross__item p {
  margin-top: 9px;
  line-height: 1.78;
  color: var(--ink-70);
}

.page-about .about-cross__link {
  display: inline-block;
  margin-top: 12px;
  font-size: 0.88rem;
  font-weight: 600;
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s var(--ease), color 0.2s var(--ease);
}

.page-about .about-cross__link:hover,
.page-about .about-cross__link:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

/* ---------- 服务与联系 ---------- */

.page-about .about-service {
  padding-bottom: clamp(40px, 6vw, 80px);
}

.page-about .about-service__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(24px, 4vw, 44px);
}

.page-about .about-service__copy h2 {
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.4rem, 3.6vw, 2.05rem);
  line-height: 1.24;
  letter-spacing: -0.018em;
  color: #ffffff;
}

.page-about .about-service__copy .eyebrow {
  color: var(--gold);
}

.page-about .about-service__copy p {
  margin-top: 14px;
  max-width: 52ch;
  line-height: 1.82;
  color: rgba(246, 241, 231, 0.76);
}

.page-about .about-service__actions {
  margin-top: 24px;
}

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

.page-about .about-service__list {
  display: grid;
  gap: 14px;
  margin: 0;
}

.page-about .about-service__list div {
  display: grid;
  gap: 4px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--line);
}

.page-about .about-service__list div:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .about-service__list dt {
  font-size: 0.74rem;
  letter-spacing: 0.08em;
  color: var(--ink-45);
}

.page-about .about-service__list dd {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.68;
  color: var(--ink);
  word-break: break-word;
}

.page-about .about-service__foot {
  margin-top: 18px;
  padding-top: 16px;
  border-top: 1px dashed var(--line);
  font-size: 0.86rem;
  line-height: 1.76;
  color: var(--ink-70);
}

.page-about .about-service__foot a {
  color: var(--blue);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 111, 237, 0.4);
}

.page-about .about-service__foot a:hover,
.page-about .about-service__foot a:focus-visible {
  color: var(--red);
  border-bottom-color: var(--red);
}

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: clamp(32px, 4vw, 56px);
    align-items: start;
  }

  .page-about .about-hero__media {
    margin-top: 34px;
  }

  .page-about .about-who__stack {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }

  .page-about .about-who__stack > :nth-child(1) {
    grid-column: 1 / span 7;
  }

  .page-about .about-who__stack > :nth-child(2) {
    grid-column: 5 / span 8;
  }

  .page-about .about-who__stack > :nth-child(3) {
    grid-column: 2 / span 10;
  }

  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1.18fr);
    gap: clamp(28px, 3.6vw, 46px);
    align-items: start;
  }

  .page-about .about-team__figure {
    position: sticky;
    top: 28px;
  }

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

  .page-about .about-timeline__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    column-gap: clamp(24px, 3vw, 44px);
  }

  .page-about .about-phase:nth-child(5) {
    grid-column: 1 / span 2;
  }

  .page-about .about-service__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero::before {
    opacity: 0.16;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-team__card,
  .page-about .about-team__duty,
  .page-about .about-cross__link,
  .page-about .about-hero__link {
    transition: none;
  }

  .page-about .about-team__card:hover,
  .page-about .about-team__card:focus-within,
  .page-about .about-team__card:focus-visible {
    transform: none;
  }
}