.page-about {
  --about-timeline-gap: 2rem;
}

/* ===== Hero 首屏 ===== */
.page-about__hero {
  position: relative;
  overflow: hidden;
  padding: 2.25rem 0 3rem;
}

.page-about__hero::before {
  content: "";
  position: absolute;
  left: -3.5rem;
  bottom: -3.5rem;
  width: 11rem;
  height: 11rem;
  background: rgba(209, 177, 6, 0.07);
  transform: rotate(45deg);
  pointer-events: none;
}

.page-about__hero::after {
  content: "";
  position: absolute;
  right: -4rem;
  top: 2rem;
  width: 12rem;
  height: 12rem;
  border: 2px solid rgba(209, 177, 6, 0.22);
  border-radius: 50%;
  pointer-events: none;
}

.page-about__hero .breadcrumb {
  margin-bottom: 2rem;
}

.page-about__hero .breadcrumb a {
  color: rgba(255, 255, 255, 0.75);
}

.page-about__hero .breadcrumb a:hover {
  color: var(--color-gold);
}

.page-about__hero .breadcrumb [aria-current="page"] {
  color: var(--color-gold);
}

.page-about__hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 2rem;
}

.page-about__hero-main h1 {
  font-family: var(--font-heading);
  font-size: 2.25rem;
  line-height: 1.2;
  color: var(--color-white);
  margin: 0 0 1rem;
}

.page-about__lead {
  font-size: 1.125rem;
  line-height: 1.7;
  color: var(--color-pale-gold);
  margin: 0 0 0.75rem;
}

.page-about__lead-sub {
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  margin: 0 0 1.25rem;
}

.page-about__inline-link {
  color: var(--color-gold);
  text-decoration: underline;
  text-underline-offset: 2px;
  font-weight: 700;
}

.page-about__hero-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.page-about__hero-aside {
  align-self: start;
}

.page-about__hero-card {
  background: var(--color-deep-blue);
  border: 1px solid rgba(209, 177, 6, 0.4);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  display: flex;
  flex-direction: column;
  box-shadow: 0 8px 24px rgba(0, 0, 0, 0.25);
}

.page-about__hero-card-label {
  font-size: 0.75rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gold);
  margin-bottom: 0.5rem;
}

.page-about__hero-card-domain {
  font-family: var(--font-heading);
  font-size: 1rem;
  color: var(--color-white);
  margin-bottom: 0.5rem;
}

.page-about__hero-card-meta {
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  margin-top: 0.25rem;
}

/* ===== 通用分节标题 ===== */
.page-about__section-head {
  margin-bottom: 2.5rem;
}

.page-about__section-head--center {
  text-align: center;
  max-width: 720px;
  margin-left: auto;
  margin-right: auto;
}

.page-about__section-head--split {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about__section-kicker {
  display: inline-block;
  font-size: 0.8125rem;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-gold);
  border: 1px solid var(--color-gold);
  border-radius: 99px;
  padding: 0.25rem 0.75rem;
  margin-bottom: 0.75rem;
}

.page-about__section-head--center .page-about__section-kicker {
  margin-left: auto;
  margin-right: auto;
}

.page-about__section-head h2 {
  font-family: var(--font-heading);
  font-size: 1.8rem;
  line-height: 1.25;
  color: var(--color-ink);
  margin: 0 0 0.5rem;
}

.page-about__section-head p {
  color: var(--color-slate);
  line-height: 1.7;
  margin: 0;
}

/* ===== 品牌历程 ===== */
.page-about__history-figure {
  margin: 0 0 var(--about-timeline-gap);
}

.page-about__history-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
}

.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 0.5625rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-navy) 100%);
}

.page-about__timeline-item {
  position: relative;
  padding-left: 2rem;
  padding-bottom: 2rem;
}

.page-about__timeline-item:last-child {
  padding-bottom: 0;
}

.page-about__timeline-marker {
  position: absolute;
  left: 0;
  top: 0.25rem;
  width: 1.125rem;
  height: 1.125rem;
  border-radius: 50%;
  background: var(--color-navy);
  border: 3px solid var(--color-gold);
  box-shadow: 0 0 0 3px rgba(209, 177, 6, 0.2);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about__timeline-item:hover .page-about__timeline-marker {
  transform: scale(1.2);
  box-shadow: 0 0 0 5px rgba(209, 177, 6, 0.28);
}

.page-about__timeline-content {
  background: var(--color-white);
  border: 1px solid rgba(10, 31, 68, 0.08);
  border-left: 3px solid var(--color-gold);
  border-radius: var(--radius-sm);
  padding: 1rem 1.25rem;
  transition: box-shadow var(--transition-fast), transform var(--transition-fast);
}

.page-about__timeline-content:hover {
  box-shadow: 0 6px 20px rgba(10, 31, 68, 0.1);
  transform: translateX(4px);
}

.page-about__timeline-year {
  display: inline-block;
  font-weight: 700;
  color: var(--color-gold);
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  margin-bottom: 0.25rem;
}

.page-about__timeline-content h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  line-height: 1.3;
  color: var(--color-navy);
  margin: 0 0 0.375rem;
}

.page-about__timeline-content p {
  font-size: 0.9375rem;
  line-height: 1.65;
  color: var(--color-slate);
  margin: 0;
}

.page-about__timeline-content a {
  color: var(--color-navy);
  font-weight: 700;
  text-decoration: underline;
  text-underline-offset: 2px;
}

/* ===== 关键数据 ===== */
.page-about__stats-section {
  position: relative;
  padding: 3rem 0;
}

.page-about__stats-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--color-gold) 0%, transparent 100%);
}

.page-about__stats-section .page-about__section-head h2 {
  color: var(--color-white);
}

.page-about__stats-section .page-about__section-head p {
  color: rgba(255, 255, 255, 0.75);
}

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

.page-about__stat-card {
  background: var(--color-deep-blue);
  border: 1px solid rgba(209, 177, 6, 0.25);
  border-radius: var(--radius-md);
  padding: 1.5rem 1.25rem;
  text-align: center;
  transition: transform var(--transition-fast), border-color var(--transition-fast);
}

.page-about__stat-card:hover {
  transform: translateY(-4px);
  border-color: var(--color-gold);
}

.page-about__stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 700;
  line-height: 1.1;
  color: var(--color-gold);
  margin-bottom: 0.375rem;
}

.page-about__stat-label {
  display: block;
  font-weight: 700;
  font-size: 0.9375rem;
  color: var(--color-white);
  margin-bottom: 0.25rem;
}

.page-about__stat-desc {
  display: block;
  font-size: 0.8125rem;
  color: rgba(255, 255, 255, 0.6);
}

.page-about__stats-chart {
  margin: 0;
}

.page-about__stats-chart-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
}

.page-about__stats-section .figure__caption {
  color: rgba(255, 255, 255, 0.65);
}

/* ===== 服务承诺 ===== */
.page-about__commitment {
  padding: 3rem 0;
}

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

.page-about__commitment-card {
  background: var(--color-white);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border-top: 4px solid var(--color-gold);
  box-shadow: 0 4px 16px rgba(10, 31, 68, 0.06);
  transition: background var(--transition-fast);
}

.page-about__commitment-card:hover {
  background: var(--color-pale-gold);
}

.page-about__commitment-num {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: rgba(10, 31, 68, 0.15);
  margin-bottom: 0.5rem;
}

.page-about__commitment-card h3 {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  line-height: 1.3;
  color: var(--color-navy);
  margin: 0 0 0.5rem;
}

.page-about__commitment-card p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: var(--color-slate);
  margin: 0;
}

.page-about__commitment-visual {
  margin: 0;
}

.page-about__commitment-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  display: block;
}

/* ===== 资质与备案 ===== */
.page-about__qualification {
  padding: 3rem 0;
}

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

.page-about__qualify-card {
  background: var(--color-white);
  border: 1px solid rgba(10, 31, 68, 0.1);
  border-bottom: 3px solid var(--color-gold);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  box-shadow: 0 2px 8px rgba(10, 31, 68, 0.04);
  transition: box-shadow var(--transition-fast);
}

.page-about__qualify-card:hover {
  box-shadow: 0 6px 18px rgba(10, 31, 68, 0.08);
}

.page-about__qualify-card h3 {
  font-family: var(--font-heading);
  font-size: 1.125rem;
  line-height: 1.3;
  color: var(--color-navy);
  margin: 0 0 0.5rem;
}

.page-about__qualify-value {
  font-size: 1rem;
  font-weight: 700;
  color: var(--color-ink);
  margin: 0 0 0.5rem;
}

.page-about__contact-banner {
  background: var(--color-navy);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  align-items: flex-start;
}

.page-about__contact-title {
  font-family: var(--font-heading);
  font-size: 1.25rem;
  color: var(--color-white);
  margin: 0 0 0.25rem;
}

.page-about__contact-banner .text-muted {
  color: rgba(255, 255, 255, 0.7);
}

/* ===== 响应式：中屏及以上 ===== */
@media (min-width: 768px) {
  .page-about__hero {
    padding: 3rem 0 4rem;
  }

  .page-about__hero-grid {
    grid-template-columns: 2fr 1fr;
    align-items: end;
    gap: 2.5rem;
  }

  .page-about__hero-main h1 {
    font-size: 2.75rem;
  }

  .page-about__hero-card {
    padding: 1.75rem 2rem;
  }

  .page-about__section-head--split {
    flex-direction: row;
    justify-content: space-between;
    align-items: flex-end;
  }

  .page-about__section-head--split > div {
    max-width: 60%;
  }

  .page-about__section-head--split > p {
    max-width: 36%;
  }

  .page-about__timeline {
    max-width: 720px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about__timeline-content h3 {
    font-size: 1.25rem;
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about__stat-num {
    font-size: 3rem;
  }

  .page-about__commitment-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }

  .page-about__commitment-visual {
    max-width: 640px;
    margin-left: auto;
    margin-right: auto;
  }

  .page-about__qualification-grid {
    grid-template-columns: repeat(2, 1fr);
    gap: 1.25rem;
  }

  .page-about__contact-banner {
    flex-direction: row;
    justify-content: space-between;
    align-items: center;
    padding: 2rem;
  }
}

/* ===== 响应式：大屏 ===== */
@media (min-width: 1200px) {
  .page-about__hero-main h1 {
    font-size: 3.25rem;
  }

  .page-about__lead {
    font-size: 1.25rem;
  }

  .page-about__stats-grid {
    grid-template-columns: repeat(6, 1fr);
  }

  .page-about__stat-card {
    padding: 1.75rem 1rem;
  }

  .page-about__stat-num {
    font-size: 2.25rem;
  }

  .page-about__qualification-grid {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about__section-head h2 {
    font-size: 2.25rem;
  }
}