.page-about {
  --_accent: var(--color-gold);
  --_deep: var(--color-deep);
  --_cream: var(--color-cream);
  background: var(--color-cream);
  color: var(--color-ink);
  overflow-x: hidden;
}

.page-about .container {
  width: min(100% - 40px, var(--max-width));
  margin-inline: auto;
}

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

/* ===== 首屏 ===== */
.page-about__intro {
  position: relative;
  padding: 28px 0 52px;
  background: var(--gradient-deep);
  color: var(--color-cream);
  border-bottom: 1px solid var(--color-gold);
}

.page-about__intro .breadcrumbs {
  margin-bottom: 36px;
}

.page-about__intro .breadcrumbs ol {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 0;
  padding: 0;
  font-family: var(--font-ui);
  font-size: 13px;
  color: rgba(245, 241, 230, 0.72);
}

.page-about__intro .breadcrumbs a {
  color: var(--color-gold-2);
  text-decoration: none;
}

.page-about__intro .breadcrumbs a:hover {
  color: var(--color-cream);
}

.page-about__leadline {
  margin: 0 0 12px;
  color: var(--color-gold-2);
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about__leadline::before {
  content: "◆ ";
  color: var(--color-gold);
}

.page-about__intro .page-header__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(32px, 7vw, 54px);
  line-height: 1.15;
  color: var(--color-cream);
  letter-spacing: 0.02em;
}

.page-about__intro .page-header__lead {
  max-width: 680px;
  margin: 0;
  color: rgba(245, 241, 230, 0.86);
  font-size: 16px;
  line-height: 1.85;
}

/* ===== 品牌故事 ===== */
.about-story {
  padding: 64px 0;
  background: var(--color-cream);
}

.about-story__grid {
  display: grid;
  gap: 40px;
  align-items: center;
}

.about-story__media {
  position: relative;
  border: 2px solid var(--color-deep);
  box-shadow: var(--shadow-2);
}

.about-story__media::after {
  content: "财";
  position: absolute;
  right: -18px;
  bottom: -18px;
  display: grid;
  place-items: center;
  width: 64px;
  height: 64px;
  background: var(--gradient-gold);
  color: var(--color-deep);
  font-family: var(--font-display);
  font-size: 34px;
  font-weight: 700;
  box-shadow: var(--shadow-float);
  z-index: 2;
}

.about-story__content .section-title {
  margin: 14px 0 16px;
}

.about-story__badge {
  display: inline-block;
  padding: 4px 10px;
  border: 1px solid var(--color-gold);
  color: var(--color-gold-3);
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.about-story__lead {
  margin: 0 0 16px;
  font-size: 20px;
  line-height: 1.6;
  color: var(--color-deep);
  font-weight: 600;
}

.about-story__content p {
  margin: 0 0 14px;
  line-height: 1.85;
}

.about-story__points {
  list-style: none;
  margin: 24px 0 32px;
  padding: 0;
  border-top: 1px solid rgba(10, 46, 75, 0.15);
}

.about-story__points li {
  position: relative;
  padding: 16px 0 16px 24px;
  border-bottom: 1px solid rgba(10, 46, 75, 0.12);
  line-height: 1.75;
}

.about-story__points li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 24px;
  width: 8px;
  height: 8px;
  background: var(--color-gold);
  transform: rotate(45deg);
}

/* ===== 数据与规模 ===== */
.about-scale {
  position: relative;
  padding: 72px 0;
  background: var(--gradient-deep);
  color: var(--color-cream);
}

.about-scale__header {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin-bottom: 32px;
}

.about-scale__eyebrow,
.about-cert__eyebrow,
.about-timeline__eyebrow,
.about-eco__eyebrow {
  margin: 0 0 4px;
  color: var(--color-gold-2);
  font-family: var(--font-ui);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
}

.about-scale .section-title {
  color: var(--color-cream);
}

.about-scale .section-lead {
  max-width: 620px;
  margin: 0;
  color: rgba(245, 241, 230, 0.7);
  line-height: 1.8;
}

.about-scale__map {
  margin-bottom: 44px;
  border: 1px solid rgba(212, 175, 55, 0.35);
  background: rgba(255, 255, 255, 0.04);
}

.about-scale__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
  margin: 0;
}

.about-scale__stat {
  margin: 0;
  padding: 18px 16px;
  background: rgba(255, 255, 255, 0.05);
  border-left: 2px solid var(--color-gold);
}

.about-scale__stat dt {
  margin-bottom: 8px;
  color: var(--color-gold-2);
  font-family: var(--font-ui);
  font-size: 12px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
}

.about-scale__stat dd {
  margin: 0;
  color: var(--color-cream);
  font-family: var(--font-display);
  font-size: 28px;
  line-height: 1.2;
}

.about-scale__stat p {
  margin: 8px 0 0;
  color: rgba(245, 241, 230, 0.68);
  font-size: 13px;
  line-height: 1.6;
}

.about-scale__note {
  margin: 28px 0 0;
  padding-left: 14px;
  border-left: 2px solid var(--color-gold);
  color: rgba(245, 241, 230, 0.78);
  font-size: 14px;
  line-height: 1.8;
}

/* ===== 资质认证 ===== */
.about-cert {
  padding: 72px 0;
  background: #EAE6DC;
}

.about-cert .section-title {
  margin: 0 0 8px;
}

.about-cert__lead {
  margin: 0 0 40px;
  color: var(--color-gray);
}

.about-cert__grid {
  display: grid;
  gap: 20px;
}

.about-cert__item {
  position: relative;
  padding: 28px;
  background: var(--color-cream-2);
  border: 1px solid rgba(10, 46, 75, 0.1);
  cursor: default;
  transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}

.about-cert__item:hover,
.about-cert__item:focus-within {
  outline: none;
  border-color: var(--color-gold);
  box-shadow: var(--shadow-2);
}

.about-cert__index {
  display: inline-flex;
  margin-bottom: 12px;
  color: var(--color-gold-3);
  font-family: var(--font-ui);
  font-size: 13px;
}

.about-cert__item h3 {
  margin: 0 0 8px;
  color: var(--color-deep);
  font-family: var(--font-display);
  font-size: 22px;
}

.about-cert__item p {
  margin: 0;
  color: var(--color-gray);
  line-height: 1.75;
}

.about-cert__detail {
  margin-top: 0;
  max-height: 0;
  overflow: hidden;
  opacity: 0;
  transition: max-height var(--transition-base), opacity var(--transition-base), margin-top var(--transition-base);
}

.about-cert__item:hover .about-cert__detail,
.about-cert__item:focus-within .about-cert__detail {
  margin-top: 12px;
  max-height: 80px;
  opacity: 1;
}

/* ===== 发展历程 ===== */
.about-timeline {
  padding: 72px 0;
  background: var(--color-cream);
}

.about-timeline__heading {
  max-width: 640px;
  margin-bottom: 48px;
}

.about-timeline__heading .section-title {
  margin: 0 0 8px;
}

.about-timeline__heading .section-lead {
  margin: 0;
  color: var(--color-gray);
  line-height: 1.8;
}

.about-timeline__track {
  position: relative;
}

.about-timeline__track::before {
  content: "";
  position: absolute;
  top: 4px;
  bottom: 4px;
  left: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold), var(--color-gold-2) 40%, var(--color-sky) 100%);
}

.about-timeline__item {
  position: relative;
  margin-left: 18px;
  padding: 0 0 40px 28px;
}

.about-timeline__item::before {
  content: "";
  position: absolute;
  top: 6px;
  left: -23px;
  width: 24px;
  height: 2px;
  background: var(--color-gold);
}

.about-timeline__dot {
  position: absolute;
  top: 0;
  left: -23px;
  width: 12px;
  height: 12px;
  background: var(--color-cream);
  border: 2px solid var(--color-gold);
  transform: rotate(45deg);
  z-index: 2;
}

.about-timeline__item h3 {
  margin: 0 0 10px;
  color: var(--color-deep);
  font-family: var(--font-display);
  font-size: 22px;
}

.about-timeline__item p {
  max-width: 560px;
  margin: 0;
  color: #5A6A70;
  line-height: 1.8;
}

.about-timeline__bottom {
  display: grid;
  gap: 32px;
  padding-top: 48px;
}

.about-timeline__team {
  border: 1px solid rgba(10, 46, 75, 0.15);
}

.about-timeline__note h3 {
  margin: 0 0 12px;
  color: var(--color-deep);
  font-family: var(--font-display);
  font-size: 24px;
}

.about-timeline__note p {
  margin: 0 0 20px;
  color: #5A6A70;
  line-height: 1.8;
}

.about-timeline__note .btn--outline {
  color: var(--color-sky);
  border-color: currentColor;
}

/* ===== 合作生态 ===== */
.about-eco {
  padding: 72px 0;
  background: var(--gradient-deep);
  color: var(--color-cream);
}

.about-eco .section-title {
  color: var(--color-cream);
  margin: 0 0 8px;
}

.about-eco .section-lead {
  margin: 0 0 40px;
  color: rgba(245, 241, 230, 0.7);
  line-height: 1.8;
}

.about-eco__list {
  list-style: none;
  margin: 0 0 48px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.about-eco__list li {
  padding: 20px;
  background: rgba(255, 255, 255, 0.06);
  border-left: 2px solid var(--color-gold);
}

.about-eco__list h3 {
  margin: 0 0 8px;
  color: var(--color-gold-2);
  font-family: var(--font-display);
  font-size: 20px;
}

.about-eco__list p {
  margin: 0;
  color: rgba(245, 241, 230, 0.78);
  font-size: 14px;
  line-height: 1.75;
}

.about-eco__cta {
  display: grid;
  gap: 24px;
  padding-top: 32px;
  border-top: 1px solid rgba(212, 175, 55, 0.3);
}

.about-eco__cta p {
  margin: 0;
  color: rgba(245, 241, 230, 0.8);
  line-height: 1.8;
}

.about-eco__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.about-eco .btn--outline {
  color: var(--color-gold-2);
  border-color: currentColor;
}

/* ===== 桌面端 ===== */
@media (min-width: 768px) {
  .page-about__intro {
    padding: 48px 0 80px;
  }

  .page-about__intro .page-header__lead {
    font-size: 18px;
  }

  .about-story {
    padding: 96px 0;
  }

  .about-story__grid {
    grid-template-columns: minmax(0, 380px) 1fr;
    gap: 64px;
  }

  .about-scale {
    padding: 96px 0;
  }

  .about-scale__header {
    flex-direction: row;
    align-items: flex-end;
    justify-content: space-between;
    margin-bottom: 40px;
  }

  .about-scale__stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .about-scale__stat dd {
    font-size: 32px;
  }

  .about-cert {
    padding: 96px 0;
  }

  .about-cert__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .about-cert__item {
    min-height: 240px;
    display: flex;
    flex-direction: column;
  }

  .about-timeline {
    padding: 96px 0;
  }

  .about-timeline__track::before {
    left: 50%;
  }

  .about-timeline__item {
    width: 50%;
    margin-left: 0;
    padding: 0 56px 56px 0;
    text-align: right;
  }

  .about-timeline__item::before {
    left: auto;
    right: 0;
    width: 40px;
  }

  .about-timeline__dot {
    left: auto;
    right: -6px;
  }

  .about-timeline__item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 56px 56px;
    text-align: left;
  }

  .about-timeline__item:nth-child(even)::before {
    right: auto;
    left: 0;
  }

  .about-timeline__item:nth-child(even) .about-timeline__dot {
    right: auto;
    left: -6px;
  }

  .about-timeline__bottom {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
    align-items: center;
    padding-top: 64px;
  }

  .about-eco {
    padding: 96px 0;
  }

  .about-eco__list {
    grid-template-columns: repeat(2, 1fr);
    gap: 20px;
  }

  .about-eco__cta {
    grid-template-columns: minmax(0, 1.3fr) auto;
    align-items: center;
  }

  .about-eco__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1100px) {
  .about-story__grid {
    gap: 96px;
  }

  .about-timeline__item p {
    font-size: 15px;
  }

  .about-eco__cta p {
    font-size: 15px;
  }
}