.page-about {
  --about-rail: 148px;
  --about-band: clamp(48px, 8vw, 96px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 4vw, 40px) 0 clamp(52px, 8vw, 96px);
  background:
    radial-gradient(1100px 520px at 88% -12%, rgba(255, 107, 53, .26), transparent 62%),
    linear-gradient(158deg, #0A2A5E 0%, #123D7A 56%, #0A2A5E 100%);
  color: #fff;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(rgba(255, 255, 255, .055) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 255, 255, .055) 1px, transparent 1px);
  background-size: 64px 64px;
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 76%);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, .9), transparent 76%);
  pointer-events: none;
}

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

.page-about .about-hero__crumb {
  margin-bottom: clamp(30px, 5vw, 54px);
}

.page-about .about-hero__crumb .breadcrumb__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-hero__crumb .breadcrumb__link {
  color: rgba(255, 255, 255, .7);
  text-decoration: none;
  font-size: .875rem;
}

.page-about .about-hero__crumb .breadcrumb__link:hover,
.page-about .about-hero__crumb .breadcrumb__link:focus-visible {
  color: #fff;
  text-decoration: underline;
}

.page-about .about-hero__crumb .breadcrumb__sep,
.page-about .about-hero__here {
  color: rgba(255, 255, 255, .5);
  font-size: .875rem;
}

.page-about .about-hero__here {
  color: rgba(255, 255, 255, .92);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--c-orange-soft);
}

.page-about .about-hero__title {
  margin: 0;
  max-width: 13em;
  font-size: clamp(2.05rem, 7.2vw, 4.4rem);
  line-height: 1.04;
  font-weight: 900;
  letter-spacing: -.015em;
  color: #fff;
}

.page-about .about-hero__lead {
  margin: clamp(20px, 3vw, 28px) 0 0;
  max-width: 34em;
  font-size: clamp(1rem, 2.3vw, 1.1875rem);
  line-height: 1.85;
  color: rgba(255, 255, 255, .82);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: clamp(34px, 5vw, 56px) 0 0;
  padding: clamp(22px, 3vw, 30px) 0 0;
  border-top: 1px solid rgba(255, 255, 255, .24);
  display: grid;
  gap: 22px;
}

.page-about .about-hero__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4.2vw, 2.25rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-orange-soft);
}

.page-about .about-hero__cap {
  display: block;
  margin-top: 10px;
  font-size: .9375rem;
  line-height: 1.6;
  color: rgba(255, 255, 255, .74);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-block {
  padding: var(--about-band) 0;
}

.page-about .about-block--gray {
  background: var(--c-gray);
}

.page-about .about-block--blue {
  background: var(--c-blue);
  color: #fff;
}

.page-about .about-head {
  margin-bottom: clamp(28px, 4vw, 48px);
}

.page-about .about-heading {
  margin: 10px 0 0;
  max-width: 17em;
  font-size: clamp(1.55rem, 4.2vw, 2.65rem);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -.01em;
  color: var(--c-blue);
}

.page-about .about-head__lead {
  margin: 16px 0 0;
  max-width: 40em;
  font-size: clamp(.9375rem, 2vw, 1.0625rem);
  line-height: 1.9;
  color: var(--c-body);
}

.page-about .about-head--light .about-heading {
  color: #fff;
}

.page-about .about-head--light .about-head__lead {
  color: rgba(255, 255, 255, .78);
}

.page-about .about-text {
  margin: clamp(16px, 2.6vw, 22px) 0 0;
  font-size: clamp(.9375rem, 2vw, 1.0625rem);
  line-height: 1.95;
  color: var(--c-body);
}

.page-about .link-inline {
  color: var(--c-blue);
  text-decoration: underline;
  text-decoration-thickness: 2px;
  text-underline-offset: 3px;
}

.page-about .link-inline:hover,
.page-about .link-inline:focus-visible {
  color: var(--c-orange);
}

.page-about .about-block--gray .link-inline {
  color: #0A2A5E;
}

/* ---------- 定位：左右错位 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .about-split__media {
  margin: 0;
  border: var(--bw) solid var(--c-blue);
  box-shadow: var(--shadow-hard);
  background: var(--c-gray);
}

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

.page-about .about-split__cap {
  padding: 12px 16px;
  border-top: var(--bw) solid var(--c-blue);
  background: var(--c-cream);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--c-blue);
}

.page-about .about-principles {
  list-style: none;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  gap: 20px;
}

.page-about .about-principles__item {
  padding-left: 18px;
  border-left: var(--bw) solid var(--c-line);
}

.page-about .about-principles__idx {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--c-orange);
}

.page-about .about-principles__title {
  margin: 8px 0 6px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-principles__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: var(--c-body);
}

/* ---------- 时间轴 ---------- */
.page-about .about-wide-figure {
  margin: 0 0 clamp(30px, 5vw, 52px);
  border: var(--bw) solid var(--c-blue);
  box-shadow: var(--shadow-hard);
  background: #fff;
}

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

.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .about-timeline__item {
  display: grid;
  gap: 10px;
  padding: 24px 0;
  border-top: var(--bw) solid var(--c-line);
}

.page-about .about-timeline__item:last-child {
  border-bottom: var(--bw) solid var(--c-line);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 4.4vw, 2.125rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--c-blue);
}

.page-about .about-timeline__item--current .about-timeline__year {
  color: var(--c-orange);
}

.page-about .about-timeline__title {
  margin: 0 0 8px;
  font-size: clamp(1.0625rem, 2.4vw, 1.25rem);
  font-weight: 700;
  color: var(--c-ink);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 44em;
  font-size: .9688rem;
  line-height: 1.85;
  color: var(--c-body);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(26px, 4vw, 46px);
}

.page-about .about-team__media {
  margin: 0;
  border: var(--bw) solid var(--c-blue);
  box-shadow: var(--shadow-hard);
  background: var(--c-gray);
}

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

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

.page-about .team-panel {
  border: var(--bw) solid var(--c-blue);
  background: var(--c-cream);
  margin-bottom: 14px;
  transition: box-shadow .25s var(--ease);
}

.page-about .team-panel:last-child {
  margin-bottom: 0;
}

.page-about .team-panel[open] {
  box-shadow: var(--shadow-hard);
}

.page-about .team-panel > summary {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 1.0625rem;
  font-weight: 700;
  color: var(--c-blue);
}

.page-about .team-panel > summary::-webkit-details-marker {
  display: none;
}

.page-about .team-panel > summary:focus-visible {
  outline: 3px solid var(--c-orange);
  outline-offset: -3px;
}

.page-about .team-panel__idx {
  flex: none;
  padding: 2px 6px;
  border: 2px solid var(--c-orange);
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .08em;
  color: var(--c-orange);
}

.page-about .team-panel > summary::after {
  content: "+";
  margin-left: auto;
  flex: none;
  font-family: var(--font-mono);
  font-size: 1.375rem;
  line-height: 1;
  color: var(--c-orange);
}

.page-about .team-panel[open] > summary::after {
  content: "–";
}

.page-about .team-panel__body {
  padding: 4px 18px 20px;
}

.page-about .team-panel__body p {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--c-body);
}

/* ---------- 三道审核 ---------- */
.page-about .about-audit {
  display: grid;
  gap: 16px;
}

.page-about .about-audit__card {
  padding: clamp(20px, 3vw, 28px);
  border: var(--bw) solid rgba(255, 255, 255, .3);
  background: rgba(255, 255, 255, .06);
}

.page-about .about-audit__num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.875rem;
  font-weight: 700;
  line-height: 1;
  color: var(--c-orange-soft);
}

.page-about .about-audit__title {
  margin: 16px 0 10px;
  font-size: 1.0625rem;
  font-weight: 700;
  color: #fff;
}

.page-about .about-audit__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: rgba(255, 255, 255, .78);
}

.page-about .about-version {
  margin-top: clamp(24px, 4vw, 36px);
  padding: clamp(20px, 3vw, 28px);
  border-left: 6px solid var(--c-orange);
  background: rgba(255, 107, 53, .12);
}

.page-about .about-version__label {
  margin: 0;
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .14em;
  color: var(--c-orange-soft);
}

.page-about .about-version__value {
  margin: 10px 0 8px;
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 4vw, 2rem);
  font-weight: 700;
  line-height: 1;
  color: #fff;
}

.page-about .about-version__note {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, .76);
}

/* ---------- 合作方式 ---------- */
.page-about .about-models {
  display: grid;
  gap: 16px;
}

.page-about .about-model {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: clamp(20px, 3vw, 26px);
  border: var(--bw) solid var(--c-blue);
  background: #fff;
  box-shadow: 4px 4px 0 rgba(10, 42, 94, .12);
  transition: box-shadow .25s var(--ease), transform .25s var(--ease);
}

.page-about .about-model:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 rgba(10, 42, 94, .2);
}

.page-about .about-model__num {
  font-family: var(--font-mono);
  font-size: .75rem;
  letter-spacing: .16em;
  color: var(--c-orange);
}

.page-about .about-model__title {
  margin: 0;
  font-size: 1.1875rem;
  font-weight: 800;
  color: var(--c-blue);
}

.page-about .about-model__text {
  margin: 0;
  font-size: .9375rem;
  line-height: 1.85;
  color: var(--c-body);
}

/* ---------- 行动区 ---------- */
.page-about .about-cta {
  padding: clamp(40px, 7vw, 76px) 0;
  background: var(--c-cream);
  border-top: var(--bw) solid var(--c-blue);
  border-bottom: var(--bw) solid var(--c-blue);
}

.page-about .about-cta__inner {
  display: grid;
  gap: clamp(22px, 3vw, 32px);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(1.5rem, 4vw, 2.25rem);
  line-height: 1.2;
  font-weight: 800;
  color: var(--c-blue);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 40em;
  font-size: .9688rem;
  line-height: 1.9;
  color: var(--c-body);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-models {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 780px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: clamp(20px, 4vw, 48px);
  }

  .page-about .about-timeline__item {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(20px, 3vw, 40px);
    align-items: start;
    padding: 30px 0;
  }

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

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

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

  .page-about .about-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: start;
  }
}

@media (min-width: 1040px) {
  .page-about .about-models {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-model,
  .page-about .team-panel {
    transition: none;
  }

  .page-about .about-model:hover {
    transform: none;
  }
}