.page-about {
  --about-hero-glow: rgba(255, 106, 0, 0.18);
  --about-journey-line: #cbd5e0;
  --about-card-bg: #edf2f7;
  --about-card-border: #e2e8f0;
  --about-num-size: 2.25rem;
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .section-label {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--color-accent);
  margin-bottom: 0.75rem;
}

.page-about .section-label::before {
  content: "";
  width: 1.5rem;
  height: 2px;
  background: var(--color-accent);
  border-radius: 2px;
}

/* ---------- 英雄区 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 2.5rem 1.25rem 3.5rem;
  background: linear-gradient(135deg, var(--color-primary) 0%, var(--color-secondary) 100%);
  color: var(--color-white);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -60px;
  width: 320px;
  height: 320px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--about-hero-glow) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: -60px;
  left: 30%;
  width: 260px;
  height: 260px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(27, 59, 111, 0.55) 0%, transparent 70%);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 2.5rem;
  font-size: var(--text-sm);
}

.page-about .about-hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.7);
  text-decoration: none;
  transition: color var(--duration) var(--ease-out);
}

.page-about .about-hero .breadcrumb a:hover {
  color: var(--color-accent-soft);
}

.page-about .about-hero .breadcrumb .breadcrumb__sep {
  margin: 0 0.375rem;
  color: rgba(255, 255, 255, 0.4);
}

.page-about .about-hero .breadcrumb [aria-current="page"] {
  color: var(--color-accent-soft);
}

.page-about .about-hero__kicker {
  font-size: var(--text-sm);
  color: var(--color-accent-soft);
  letter-spacing: 0.1em;
  margin-bottom: 0.75rem;
}

.page-about .about-hero__title {
  margin: 0 0 1rem;
  font-size: clamp(1.75rem, 4vw, 2.75rem);
  font-weight: 900;
  line-height: 1.2;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.page-about .about-hero__lead {
  margin: 0 0 2rem;
  font-size: var(--text-lg);
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.85);
  max-width: 32em;
}

.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.625rem 1.5rem;
  padding-top: 1.25rem;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .about-hero__index {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  color: rgba(255, 255, 255, 0.9);
  font-size: var(--text-sm);
  font-weight: 500;
  text-decoration: none;
  transition: color var(--duration) var(--ease-out);
}

.page-about .about-hero__index .text-mono {
  color: var(--color-accent-soft);
  font-size: var(--text-xs);
}

.page-about .about-hero__index:hover {
  color: var(--color-accent-soft);
}

/* ---------- 我们是谁 ---------- */
.page-about .about-identity {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  padding: 3rem 1.25rem;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-identity__copy h2,
.page-about .about-journey__head h2,
.page-about .about-v3-story h2,
.page-about .about-capability__intro h2,
.page-about .about-ecosystem h2 {
  margin: 0 0 1rem;
  font-size: var(--text-2xl);
  font-weight: 800;
  line-height: 1.25;
  color: var(--color-text);
}

.page-about .about-identity__copy p,
.page-about .about-journey__head > p,
.page-about .about-v3-story__inner p,
.page-about .about-capability__intro > p,
.page-about .about-ecosystem p {
  color: var(--color-text-muted);
  line-height: 1.7;
}

.page-about .about-identity__copy p + p {
  margin-top: 1rem;
}

.page-about .about-identity__figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--color-bg-soft);
}

.page-about .about-identity figcaption,
.page-about .about-journey figcaption,
.page-about .about-capability figcaption {
  padding: 0.875rem 1.25rem;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}

/* ---------- 品牌历程 ---------- */
.page-about .about-journey {
  padding: 3rem 1.25rem;
  background: linear-gradient(180deg, var(--color-bg-soft) 0%, transparent 100%);
}

.page-about .about-journey__head {
  max-width: var(--content-max);
  margin: 0 auto 2rem;
}

.page-about .about-journey__head > p {
  max-width: 36em;
}

.page-about .about-journey__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-journey__timeline {
  position: relative;
  padding-left: 0;
}

.page-about .about-journey__timeline::before {
  content: "";
  position: absolute;
  left: 0.5rem;
  top: 0.75rem;
  bottom: 2.5rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-secondary) 0%, var(--about-journey-line) 100%);
}

.page-about .about-journey__item {
  position: relative;
  padding-left: 2.25rem;
  padding-bottom: 1.75rem;
}

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

.page-about .about-journey__marker {
  position: absolute;
  left: 0;
  top: 0.375rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--color-primary);
  border: 3px solid var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-bg-soft);
  z-index: 1;
}

.page-about .about-journey__item--current .about-journey__marker {
  background: var(--color-accent);
  border-color: var(--color-accent-soft);
}

.page-about .about-journey__toggle {
  display: flex;
  align-items: baseline;
  gap: 0.75rem;
  width: 100%;
  padding: 0;
  border: 0;
  background: none;
  font: inherit;
  text-align: left;
  cursor: pointer;
  color: var(--color-text);
}

.page-about .about-journey__version {
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-accent);
  min-width: 3rem;
}

.page-about .about-journey__title {
  font-size: var(--text-lg);
  font-weight: 700;
  flex: 1;
}

.page-about .about-journey__icon {
  font-size: 1.25rem;
  font-weight: 700;
  line-height: 1;
  color: var(--color-accent);
  transform: rotate(45deg);
  transition: transform var(--duration) var(--ease-out);
}

.page-about .about-journey__toggle[aria-expanded="false"] .about-journey__icon {
  transform: rotate(0deg);
}

.page-about .about-journey__toggle:hover .about-journey__title {
  color: var(--color-accent);
}

.page-about .about-journey__desc {
  margin-top: 0.625rem;
  padding-left: 3.75rem;
}

.page-about .about-journey__desc[data-open="false"] {
  display: none;
}

.page-about .about-journey__desc p {
  margin: 0;
  color: var(--color-text-muted);
  line-height: 1.7;
  font-size: var(--text-md);
}

.page-about .about-journey__figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--color-white);
  border: 1px solid var(--color-line);
  align-self: center;
}

/* ---------- V3更新公告的诞生 ---------- */
.page-about .about-v3-story {
  padding: 3rem 1.25rem;
  max-width: 920px;
  margin: 0 auto;
}

.page-about .about-v3-story__inner {
  background: var(--color-white);
  border-radius: var(--radius-card);
  border: 1px solid var(--color-line);
  padding: 2rem 1.5rem;
  box-shadow: var(--shadow-card);
}

.page-about .about-v3-story__inner h2 {
  font-size: var(--text-2xl);
}

.page-about .about-v3-story__inner p + p {
  margin-top: 1rem;
}

.page-about .about-v3-story__quote {
  margin: 1.75rem 0;
  padding: 1.25rem 1.5rem;
  border-left: 4px solid var(--color-accent);
  background: var(--color-bg-soft);
  font-size: var(--text-lg);
  font-weight: 700;
  line-height: 1.5;
  color: var(--color-primary);
}

/* ---------- 服务能力 ---------- */
.page-about .about-capability {
  padding: 3rem 1.25rem;
  max-width: var(--content-max);
  margin: 0 auto;
}

.page-about .about-capability__intro {
  margin-bottom: 2rem;
}

.page-about .about-capability__intro > p {
  max-width: 34em;
}

.page-about .about-capability__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}

.page-about .about-capability__card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-card-border);
  border-radius: var(--radius-card);
  padding: 1.75rem 1.5rem;
  transition: transform var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out), box-shadow var(--duration) var(--ease-out);
}

.page-about .about-capability__card:hover {
  transform: translateY(-4px);
  border-color: var(--color-accent);
  box-shadow: var(--shadow-card-hover);
}

.page-about .about-capability__num {
  display: block;
  font-size: var(--about-num-size);
  font-weight: 700;
  color: var(--color-accent);
  line-height: 1.2;
  letter-spacing: -0.02em;
  margin-bottom: 0.75rem;
}

.page-about .about-capability__card h3 {
  margin: 0 0 0.5rem;
  font-size: var(--text-lg);
  font-weight: 700;
  color: var(--color-text);
}

.page-about .about-capability__card p {
  margin: 0;
  color: var(--color-text-muted);
  line-height: 1.6;
  font-size: var(--text-sm);
}

.page-about .about-capability__card .about-capability__note {
  margin-top: 0.875rem;
  padding-top: 0.875rem;
  border-top: 1px solid transparent;
  font-size: var(--text-xs);
  transition: border-color var(--duration) var(--ease-out);
}

.page-about .about-capability__card:hover .about-capability__note {
  border-top-color: var(--color-accent-soft);
  color: var(--color-text);
}

.page-about .about-capability__figure {
  margin: 0;
  border-radius: var(--radius-card);
  overflow: hidden;
  background: var(--color-bg-soft);
  border: 1px solid var(--color-line);
}

/* ---------- 合作与生态 ---------- */
.page-about .about-ecosystem {
  padding: 3rem 1.25rem;
  background: linear-gradient(180deg, transparent 0%, var(--color-bg-soft) 100%);
}

.page-about .about-ecosystem__inner {
  max-width: 960px;
  margin: 0 auto;
}

.page-about .about-ecosystem p + p {
  margin-top: 1rem;
}

.page-about .about-ecosystem__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.875rem 1.5rem;
  margin-top: 2rem;
  padding-top: 1.5rem;
  border-top: 1px solid var(--color-line);
}

.page-about .about-ecosystem__link {
  position: relative;
  display: inline-flex;
  align-items: center;
  gap: 0.375rem;
  font-weight: 600;
  color: var(--color-primary);
  text-decoration: none;
  padding-bottom: 0.25rem;
  border-bottom: 2px solid var(--color-accent);
  transition: color var(--duration) var(--ease-out), border-color var(--duration) var(--ease-out);
}

.page-about .about-ecosystem__link:hover {
  color: var(--color-accent);
  border-bottom-color: var(--color-primary);
}

/* ---------- 平板 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 3.5rem 2rem 5rem;
  }

  .page-about .about-identity,
  .page-about .about-journey,
  .page-about .about-capability {
    padding-right: 2rem;
    padding-left: 2rem;
  }

  .page-about .about-identity {
    grid-template-columns: 1fr 0.85fr;
    align-items: center;
    gap: 2.5rem;
  }

  .page-about .about-journey__layout {
    grid-template-columns: 1fr;
    gap: 2rem;
  }

  .page-about .about-capability__grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-v3-story {
    padding-right: 2rem;
    padding-left: 2rem;
  }

  .page-about .about-ecosystem {
    padding-right: 2rem;
    padding-left: 2rem;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    padding-right: 2rem;
  }

  .page-about .about-hero__title {
    font-size: clamp(2rem, 4vw, 3rem);
    max-width: 18em;
  }

  .page-about .about-hero__meta {
    gap: 0.625rem 2rem;
  }

  .page-about .about-identity {
    gap: 4rem;
  }

  .page-about .about-journey__layout {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    gap: 3rem;
  }

  .page-about .about-journey__item {
    padding-left: 2.5rem;
  }

  .page-about .about-journey__desc {
    padding-left: 4rem;
  }

  .page-about .about-capability__grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-v3-story__inner {
    padding: 3rem 2.5rem;
  }

  .page-about .about-capability {
    display: grid;
    grid-template-columns: 0.8fr 1.2fr;
    gap: 2.5rem 3rem;
  }

  .page-about .about-capability__intro {
    grid-column: 1 / -1;
  }

  .page-about .about-capability__grid {
    grid-column: 1 / -1;
  }

  .page-about .about-capability__figure {
    grid-column: 1 / -1;
    display: grid;
    grid-template-columns: 1fr 1fr;
    align-items: center;
    max-width: 760px;
    margin: 0 auto;
  }

  .page-about .about-ecosystem__inner {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about .about-ecosystem .section-label,
  .page-about .about-ecosystem h2 {
    grid-column: 1 / -1;
  }

  .page-about .about-ecosystem p {
    grid-column: 1 / -1;
  }

  .page-about .about-ecosystem__actions {
    grid-column: 1 / -1;
    justify-content: center;
  }
}