.page-about {
  --about-num-size: clamp(3.5rem, 8vw, 6.5rem);
  background: var(--color-bg);
  overflow-x: hidden;
}

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

.page-about .about-hero {
  padding: 28px 0 64px;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
  align-items: center;
}

.page-about .about-hero__copy {
  position: relative;
}

.page-about .about-hero__copy::before {
  content: "";
  display: block;
  width: 72px;
  height: 8px;
  margin-bottom: 24px;
  background: var(--color-clay);
}

.page-about .page-title {
  margin: 0 0 20px;
  font-size: clamp(2.25rem, 6vw, 4.15rem);
  line-height: 1.08;
  letter-spacing: -0.02em;
  max-width: 14em;
}

.page-about .lede {
  margin: 0 0 28px;
  font-family: var(--font-body);
  font-size: clamp(1.0625rem, 2vw, 1.25rem);
  line-height: 1.7;
  max-width: 36em;
}

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

.page-about .about-hero__media {
  position: relative;
  border-left: 4px solid var(--color-lime);
}

.page-about .about-hero__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  margin-bottom: 40px;
  font-size: 0.875rem;
  color: var(--color-slate);
}

.page-about .breadcrumb a {
  color: var(--color-blue);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumb a:hover {
  color: var(--color-clay);
}

.page-about .about-overview {
  background: var(--color-surface);
  padding: 64px 0;
}

.page-about .about-overview__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-overview__index {
  display: flex;
  gap: 20px;
  align-items: baseline;
}

.page-about .about-overview__num {
  font-family: var(--font-heading);
  font-size: var(--about-num-size);
  font-weight: 800;
  line-height: 0.9;
  color: var(--color-clay);
}

.page-about .about-overview__body h2 {
  margin: 0 0 16px;
  font-size: clamp(1.6rem, 3.6vw, 2.6rem);
  line-height: 1.15;
}

.page-about .about-overview__body p {
  margin: 0 0 16px;
  font-size: 1rem;
  line-height: 1.75;
  max-width: 46em;
}

.page-about .about-overview__body .btn {
  margin-top: 12px;
}

.page-about .about-journey {
  padding: 72px 0 88px;
}

.page-about .about-journey__head {
  max-width: 720px;
  margin-bottom: 40px;
}

.page-about .about-journey__head h2 {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 3rem);
  line-height: 1.1;
}

.page-about .about-journey__layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-journey__media {
  min-height: 240px;
}

.page-about .about-journey__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
}

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

.page-about .about-journey__item {
  position: relative;
  padding: 0 0 28px 32px;
  border-left: 1px solid var(--color-surface);
}

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

.page-about .about-journey__item::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 6px;
  width: 12px;
  height: 12px;
  background: var(--color-clay);
  transform: rotate(45deg);
}

.page-about .about-journey__meta {
  display: flex;
  align-items: center;
  gap: 12px;
  margin-bottom: 8px;
}

.page-about .about-journey__year {
  font-family: var(--font-heading);
  font-size: clamp(1.55rem, 3.4vw, 2.4rem);
  font-weight: 800;
  color: var(--color-blue);
  line-height: 1;
}

.page-about .about-journey__title-row {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
}

.page-about .about-journey__title-row h3 {
  margin: 0;
  font-size: 1.08rem;
  letter-spacing: 0.01em;
}

.page-about .about-journey__expand {
  flex: 0 0 auto;
  border: 1px solid var(--color-surface);
  background: transparent;
  padding: 5px 14px;
  font-size: 0.78rem;
  font-family: var(--font-body);
  color: var(--color-slate);
  border-radius: 999px;
  cursor: pointer;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .about-journey__expand::before {
  content: "收起";
}

.page-about .about-journey__expand[aria-expanded="false"]::before {
  content: "展开";
}

.page-about .about-journey__expand:hover {
  border-color: var(--color-clay);
  color: var(--color-clay);
}

.page-about .about-journey__panel {
  display: block;
  margin-top: 10px;
  color: var(--color-slate);
  line-height: 1.7;
  font-size: 0.96rem;
}

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

.page-about .about-philosophy {
  background: var(--color-bg);
  padding: 72px 0 88px;
}

.page-about .about-philosophy__media {
  margin-bottom: 32px;
}

.page-about .about-philosophy__media img {
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
}

.page-about .about-philosophy__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about .about-philosophy__intro h2 {
  margin: 0 0 16px;
  font-size: clamp(1.75rem, 4vw, 3rem);
  line-height: 1.12;
}

.page-about .about-philosophy__intro p:not(.kicker) {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.65;
  color: var(--color-slate);
}

.page-about .about-philosophy__point {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 16px;
  padding: 20px 0;
  border-top: 1px solid var(--color-surface);
}

.page-about .about-philosophy__point:first-of-type {
  border-top: 0;
}

.page-about .about-philosophy__point-num {
  font-family: var(--font-heading);
  font-size: 0.9rem;
  font-weight: 700;
  color: var(--color-clay);
  letter-spacing: 0.1em;
}

.page-about .about-philosophy__point h3 {
  margin: 0 0 8px;
  font-size: 1.1rem;
}

.page-about .about-philosophy__point p {
  margin: 0;
  color: var(--color-slate);
  line-height: 1.7;
  font-size: 0.97rem;
}

.page-about .about-capability {
  background: var(--color-blue);
  color: var(--color-bg);
  padding: 72px 0 88px;
}

.page-about .about-capability__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-capability .kicker {
  color: var(--color-lime);
}

.page-about .about-capability h2 {
  margin: 0 0 18px;
  font-size: clamp(1.75rem, 4vw, 3rem);
  line-height: 1.14;
}

.page-about .about-capability p {
  max-width: 30em;
  line-height: 1.75;
  opacity: 0.85;
  margin: 0 0 24px;
}

.page-about .about-capability__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-capability__stat {
  background: rgba(255, 255, 255, 0.05);
  padding: 20px 24px;
  border-left: 3px solid var(--color-clay);
  transition: background 0.25s ease;
}

.page-about .about-capability__stat:hover {
  background: rgba(255, 255, 255, 0.1);
}

.page-about .about-capability__num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 6vw, 4.2rem);
  font-weight: 800;
  line-height: 1;
  color: var(--color-lime);
  margin-bottom: 6px;
}

.page-about .about-capability__label {
  font-size: 0.9rem;
  color: var(--color-bg);
  opacity: 0.8;
}

.page-about .about-eco {
  background: var(--color-surface);
  padding: 72px 0 88px;
}

.page-about .about-eco .section-head {
  max-width: 720px;
}

.page-about .about-eco h2 {
  margin: 0;
  font-size: clamp(1.75rem, 4vw, 3rem);
  line-height: 1.12;
}

.page-about .about-eco__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: 36px;
}

.page-about .about-eco__card {
  position: relative;
  background: var(--color-bg);
  padding: 26px 26px 24px;
  box-shadow: var(--shadow-card);
  border: 1px solid transparent;
  transition: transform 0.25s ease, border-color 0.25s ease;
}

.page-about .about-eco__card:hover {
  transform: translateY(-4px);
  border-color: var(--color-lime);
}

.page-about .about-eco__card h3 {
  margin: 0 0 10px;
  font-size: 1.12rem;
  color: var(--color-blue);
}

.page-about .about-eco__card p {
  margin: 0 0 16px;
  color: var(--color-slate);
  line-height: 1.7;
  font-size: 0.95rem;
}

.page-about .about-eco__cta {
  margin-top: 36px;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
  align-items: center;
  justify-content: space-between;
  padding: 28px 0 0;
  border-top: 1px solid var(--color-moss);
}

.page-about .about-eco__cta p {
  margin: 0;
  font-weight: 700;
  color: var(--color-ink);
}

@media (min-width: 768px) {
  .page-about .about-hero__grid {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px 64px;
  }

  .page-about .about-overview__grid {
    grid-template-columns: 0.45fr 1.55fr;
    gap: 48px;
  }

  .page-about .about-overview__index {
    flex-direction: column;
    gap: 8px;
  }

  .page-about .about-journey__layout {
    grid-template-columns: 0.85fr 1.15fr;
    align-items: start;
  }

  .page-about .about-philosophy__grid {
    grid-template-columns: 0.8fr 1.2fr;
    gap: 40px 72px;
  }

  .page-about .about-capability__grid {
    grid-template-columns: 0.95fr 1.05fr;
    gap: 60px;
  }

  .page-about .about-capability__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }

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