.page-about {
  --about-hero-gap: 2rem;
  --about-section-spacing: 4rem;
  --timeline-dot-size: 1rem;
  --timeline-line-width: 2px;
  --card-shadow: 0 4px 20px rgba(10, 61, 44, 0.08);
  --card-shadow-hover: 0 8px 32px rgba(10, 61, 44, 0.15);
  --transition-card: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);

  display: block;
  padding: 0 1rem 3rem;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  background: var(--color-bg, #F5F5F0);
  color: var(--color-text, #1A1A1A);
  font-family: var(--font-body, Georgia, serif);
  line-height: 1.7;
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
  padding: 1.25rem 0 0.5rem;
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-text-secondary, #4A4A4A);
}
.page-about .breadcrumb a {
  color: var(--color-accent, #C9A84C);
  text-decoration: none;
  transition: color var(--transition, 0.3s ease-out);
}
.page-about .breadcrumb a:hover {
  color: var(--color-accent-dark, #A68A2E);
}
.page-about .breadcrumb__sep {
  color: var(--color-border, #D6D6CC);
  font-weight: 400;
}
.page-about .breadcrumb__current {
  color: var(--color-text-primary, #1A1A1A);
  font-weight: 700;
}

/* ---- 通用section heading ---- */
.page-about .section-heading {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 1.75rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-primary, #0A3D2C);
  margin: 0 0 1.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 3px solid var(--color-accent, #C9A84C);
}
.page-about .section-heading__num {
  font-size: 1.25rem;
  color: var(--color-accent, #C9A84C);
  font-weight: 700;
  margin-right: 0.25rem;
}

/* ---- 英雄区 ---- */
.page-about .about-hero {
  margin: 0.5rem 0 var(--about-section-spacing, 4rem);
}
.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-hero-gap, 2rem);
  align-items: center;
}
.page-about .about-hero__text {
  order: 2;
}
.page-about .about-hero__title {
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 2.5rem;
  font-weight: 800;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  color: var(--color-primary, #0A3D2C);
  margin: 0 0 0.25rem;
  line-height: 1.1;
}
.page-about .about-hero__subtitle {
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 1.125rem;
  font-weight: 600;
  color: var(--color-accent, #C9A84C);
  text-transform: uppercase;
  letter-spacing: 0.08em;
  margin: 0 0 0.75rem;
}
.page-about .about-hero__lead {
  font-family: var(--font-body, Georgia, serif);
  font-size: 1rem;
  color: var(--color-text-secondary, #4A4A4A);
  max-width: 32em;
  line-height: 1.7;
  margin: 0;
}
.page-about .about-hero__img-wrap {
  order: 1;
  position: relative;
  overflow: hidden;
  border-radius: 4px;
  box-shadow: 0 6px 24px rgba(10, 61, 44, 0.12);
}
.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 1600 / 600;
}

/* ---- 我们的理念 ---- */
.page-about .about-mission {
  margin-bottom: var(--about-section-spacing, 4rem);
}
.page-about .about-mission__inner {
  max-width: 100%;
}
.page-about .about-mission__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: start;
}
.page-about .about-mission__content {
  position: relative;
  padding: 1.5rem 1.5rem 1.5rem 1.25rem;
  background: var(--color-surface, #FFFFFF);
  border-left: 4px solid var(--color-accent, #C9A84C);
  box-shadow: var(--card-shadow);
}
.page-about .about-mission__statement {
  font-size: 1.0625rem;
  color: var(--color-text, #1A1A1A);
  margin: 0 0 1rem;
  line-height: 1.8;
}
.page-about .about-mission__list {
  list-style: none;
  padding: 0;
  margin: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.page-about .about-mission__list-item {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.9375rem;
  color: var(--color-text-secondary, #4A4A4A);
  line-height: 1.6;
}
.page-about .about-mission__list-item::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--color-accent, #C9A84C);
  font-weight: 700;
}
.page-about .about-mission__deco {
  display: none;
}
.page-about .about-mission__deco-num {
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 6rem;
  font-weight: 800;
  color: var(--color-primary, #0A3D2C);
  opacity: 0.06;
  line-height: 1;
  user-select: none;
}

/* ---- 发展历程 ---- */
.page-about .about-journey {
  margin-bottom: var(--about-section-spacing, 4rem);
}
.page-about .about-journey__inner {
  max-width: 100%;
}
.page-about .about-journey__img-block {
  margin-bottom: 2rem;
  border-radius: 4px;
  overflow: hidden;
  box-shadow: var(--card-shadow);
}
.page-about .about-journey__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 600 / 400;
  object-fit: cover;
}

/* ---- 时间线 ---- */
.page-about .timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  padding-left: 2rem;
}
.page-about .timeline__item {
  position: relative;
  display: flex;
  flex-direction: column;
}
.page-about .timeline__marker {
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  width: 1.5rem;
  z-index: 2;
}
.page-about .timeline__dot {
  width: var(--timeline-dot-size, 1rem);
  height: var(--timeline-dot-size, 1rem);
  border-radius: 50%;
  background: var(--color-accent, #C9A84C);
  border: 3px solid var(--color-primary, #0A3D2C);
  flex-shrink: 0;
  box-shadow: 0 0 0 4px var(--color-bg, #F5F5F0);
}
.page-about .timeline__line {
  width: var(--timeline-line-width, 2px);
  flex: 1;
  min-height: 2rem;
  background: var(--color-primary, #0A3D2C);
  opacity: 0.3;
  margin-top: 4px;
}
.page-about .timeline__item:last-child .timeline__line {
  display: none;
}
.page-about .timeline__card {
  background: var(--color-surface, #FFFFFF);
  border: 1px solid var(--color-border, #D6D6CC);
  border-left: 3px solid var(--color-accent, #C9A84C);
  border-radius: 4px;
  box-shadow: var(--card-shadow);
  transition: box-shadow var(--transition-card), transform var(--transition-card);
  overflow: hidden;
}
.page-about .timeline__card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-2px);
}
.page-about .timeline__card-summary {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.75rem;
  padding: 1rem 1.25rem;
  cursor: pointer;
  list-style: none;
  font-family: var(--font-body, Georgia, serif);
}
.page-about .timeline__card-summary::-webkit-details-marker {
  display: none;
}
.page-about .timeline__tag {
  display: inline-block;
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 0.6875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  padding: 0.2rem 0.6rem;
  background: var(--color-primary, #0A3D2C);
  color: var(--color-text-on-primary, #FFFFFF);
  border-radius: 2px;
  line-height: 1.4;
}
.page-about .timeline__card-title {
  flex: 1;
  min-width: 120px;
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 1.0625rem;
  font-weight: 700;
  margin: 0;
  color: var(--color-primary, #0A3D2C);
  line-height: 1.3;
}
.page-about .timeline__card-chevron {
  display: inline-block;
  width: 0.75rem;
  height: 0.75rem;
  border-right: 2px solid var(--color-accent, #C9A84C);
  border-bottom: 2px solid var(--color-accent, #C9A84C);
  transform: rotate(45deg);
  transition: transform 0.3s ease;
  flex-shrink: 0;
}
.page-about .timeline__card[open] .timeline__card-chevron {
  transform: rotate(-135deg);
}
.page-about .timeline__card-body {
  padding: 0 1.25rem 1.25rem;
  font-size: 0.9375rem;
  color: var(--color-text-secondary, #4A4A4A);
  line-height: 1.7;
  border-top: 1px solid var(--color-border, #D6D6CC);
  padding-top: 1rem;
}
.page-about .timeline__card-body p {
  margin: 0;
}

/* ---- 品牌承诺 ---- */
.page-about .about-promise {
  margin-bottom: var(--about-section-spacing, 4rem);
}
.page-about .about-promise__inner {
  max-width: 100%;
}
.page-about .promise-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2rem;
}
.page-about .promise-card {
  background: var(--color-surface, #FFFFFF);
  border: 1px solid var(--color-border, #D6D6CC);
  border-radius: 4px;
  padding: 1.75rem 1.5rem 1.5rem;
  box-shadow: var(--card-shadow);
  transition: box-shadow var(--transition-card), transform var(--transition-card);
  position: relative;
}
.page-about .promise-card:hover {
  box-shadow: var(--card-shadow-hover);
  transform: translateY(-3px);
}
.page-about .promise-card__icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 3rem;
  height: 3rem;
  border-radius: 50%;
  background: var(--color-primary, #0A3D2C);
  margin-bottom: 1rem;
}
.page-about .promise-card__icon-num {
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 1.125rem;
  font-weight: 800;
  color: var(--color-accent, #C9A84C);
  line-height: 1;
}
.page-about .promise-card__title {
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 1.125rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.04em;
  color: var(--color-primary, #0A3D2C);
  margin: 0 0 0.5rem;
}
.page-about .promise-card__text {
  font-size: 0.9375rem;
  color: var(--color-text-secondary, #4A4A4A);
  line-height: 1.7;
  margin: 0;
}
.page-about .about-promise__img-row {
  display: flex;
  justify-content: center;
  margin-top: 1rem;
}
.page-about .about-promise__img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 400 / 300;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: var(--card-shadow);
}

/* ---- CTA 区块 ---- */
.page-about .about-cta {
  background: var(--color-primary, #0A3D2C);
  border-radius: 4px;
  padding: 2rem 1.5rem;
  margin-top: 1rem;
  text-align: center;
}
.page-about .about-cta__inner {
  max-width: 36rem;
  margin: 0 auto;
}
.page-about .about-cta__text {
  font-family: var(--font-body, Georgia, serif);
  font-size: 0.9375rem;
  color: var(--color-text-on-primary, #FFFFFF);
  opacity: 0.85;
  margin: 0 0 1.25rem;
  line-height: 1.7;
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
}
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.75rem;
  font-family: var(--font-heading, Montserrat, sans-serif);
  font-size: 0.875rem;
  font-weight: 700;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  text-decoration: none;
  border-radius: 4px;
  transition: background var(--transition, 0.3s ease-out), color var(--transition, 0.3s ease-out), box-shadow var(--transition, 0.3s ease-out);
  line-height: 1.4;
  white-space: nowrap;
}
.page-about .btn--primary {
  background: var(--color-accent, #C9A84C);
  color: var(--color-text-on-accent, #1A1A1A);
  border: 2px solid var(--color-accent, #C9A84C);
}
.page-about .btn--primary:hover {
  background: var(--color-accent-dark, #A68A2E);
  border-color: var(--color-accent-dark, #A68A2E);
  box-shadow: 0 4px 16px rgba(201, 168, 76, 0.3);
}
.page-about .btn--outline {
  background: transparent;
  color: var(--color-text-on-primary, #FFFFFF);
  border: 2px solid var(--color-text-on-primary, #FFFFFF);
}
.page-about .btn--outline:hover {
  background: rgba(255, 255, 255, 0.12);
  border-color: var(--color-accent, #C9A84C);
  color: var(--color-accent, #C9A84C);
}

/* ---- 桌面端（≥769px） ---- */
@media (min-width: 769px) {
  .page-about {
    padding: 0 2rem 4rem;
  }
  .page-about .breadcrumb {
    padding-top: 1.75rem;
  }
  .page-about .about-hero__inner {
    grid-template-columns: 1fr 1.1fr;
    gap: 3rem;
  }
  .page-about .about-hero__text {
    order: 1;
  }
  .page-about .about-hero__img-wrap {
    order: 2;
  }
  .page-about .about-hero__title {
    font-size: 3.5rem;
  }
  .page-about .about-hero__subtitle {
    font-size: 1.25rem;
  }
  .page-about .about-hero__lead {
    font-size: 1.0625rem;
  }
  .page-about .about-mission__grid {
    grid-template-columns: 1.5fr 1fr;
    gap: 2.5rem;
  }
  .page-about .about-mission__deco {
    display: flex;
    flex-direction: column;
    align-items: flex-end;
    justify-content: flex-start;
    padding-top: 0.5rem;
  }
  .page-about .about-mission__deco-num {
    display: block;
    font-size: 8rem;
    opacity: 0.08;
    line-height: 1;
    margin-bottom: -0.25rem;
  }
  .page-about .about-mission__deco-line {
    display: block;
    width: 80%;
    height: 3px;
    background: var(--color-accent, #C9A84C);
    opacity: 0.5;
    border-radius: 2px;
  }
  .page-about .section-heading {
    font-size: 2rem;
  }
  .page-about .about-journey__img-block {
    max-width: 60%;
    margin-bottom: 2.5rem;
  }
  .page-about .timeline {
    padding-left: 3rem;
    gap: 2rem;
  }
  .page-about .timeline__marker {
    left: -3rem;
    width: 2rem;
  }
  .page-about .timeline__dot {
    width: 1.25rem;
    height: 1.25rem;
  }
  .page-about .timeline__card-summary {
    padding: 1.25rem 1.75rem;
  }
  .page-about .timeline__card-body {
    padding: 0 1.75rem 1.5rem;
    padding-top: 1rem;
  }
  .page-about .promise-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }
  .page-about .promise-card {
    padding: 2rem 1.75rem 1.75rem;
  }
  .page-about .about-promise__img-row {
    justify-content: flex-start;
  }
  .page-about .about-cta {
    padding: 3rem 2rem;
  }
  .page-about .about-cta__text {
    font-size: 1rem;
  }
}

/* ---- 大桌面端（≥1024px） ---- */
@media (min-width: 1024px) {
  .page-about .about-hero__title {
    font-size: 4rem;
  }
  .page-about .about-hero__inner {
    gap: 4rem;
  }
  .page-about .section-heading {
    font-size: 2.25rem;
  }
  .page-about .timeline__card-title {
    font-size: 1.125rem;
  }
}

.page-about {
  --color-text-primary: var(--color-text-on-primary);
}