.page-about {
  --about-timeline-axis: 18px;
  --about-timeline-gap: 28px;
  background: var(--color-fog);
  color: var(--color-carbon);
  overflow-x: clip;
}

/* ========== Hero区 ========== */
.page-about .about-hero {
  position: relative;
  padding: 40px 0 56px;
  background: linear-gradient(180deg, rgba(10, 37, 64, 0.05), rgba(10, 37, 64, 0.02) 55%, transparent);
  border-bottom: 1px solid var(--color-cloud);
}

.page-about .about-hero::after {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  bottom: -1px;
  height: 5px;
  background: repeating-linear-gradient(90deg, var(--color-gold) 0 18px, transparent 18px 26px);
  opacity: 0.5;
}

.page-about .about-hero__grid {
  display: flex;
  flex-direction: column;
  gap: 36px;
}

.page-about .about-hero__content {
  max-width: 760px;
}

.page-about .about-hero .breadcrumb {
  margin-bottom: 28px;
}

.page-about .about-hero h1 {
  font-family: var(--font-headline);
  font-size: clamp(34px, 6vw, 48px);
  line-height: 1.15;
  color: var(--color-navy);
  letter-spacing: 0.02em;
  margin: 8px 0 16px;
}

.page-about .about-hero__lead {
  font-family: var(--font-body);
  font-size: 17px;
  line-height: 1.8;
  color: #445d76;
  margin-bottom: 28px;
  max-width: 620px;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 20px 40px;
}

.page-about .about-hero__stat {
  display: flex;
  align-items: baseline;
  gap: 10px;
  border-left: 2px solid var(--color-gold);
  padding-left: 14px;
}

.page-about .about-hero__stat strong {
  font-family: var(--font-mono);
  font-size: 32px;
  color: var(--color-navy);
  line-height: 1;
  white-space: nowrap;
}

.page-about .about-hero__stat span {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-royal);
  letter-spacing: 0.04em;
  white-space: nowrap;
}

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

.page-about .about-hero__frame {
  position: relative;
  max-width: 460px;
  border: 1px solid var(--color-cloud);
  background: var(--color-white);
  padding: 20px 20px 28px;
  box-shadow: var(--shadow-card);
  border-radius: var(--radius-md);
}

.page-about .about-hero__frame::before {
  content: '';
  position: absolute;
  top: -1px;
  left: -1px;
  width: 64px;
  height: 4px;
  background: var(--color-gold);
  border-radius: 0 0 2px 0;
}

.page-about .about-hero__frame::after {
  content: '';
  position: absolute;
  left: 20px;
  right: 20px;
  bottom: 14px;
  height: 4px;
  background: repeating-linear-gradient(90deg, var(--color-gold) 0 10px, transparent 10px 18px);
  opacity: 0.4;
}

.page-about .about-hero__frame-code {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-royal);
  letter-spacing: 0.08em;
  display: block;
  margin-bottom: 12px;
}

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

/* ========== 品牌源起 ========== */
.page-about .about-origin {
  padding: 72px 0 48px;
}

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

.page-about .about-origin__header h2,
.page-about .about-commitment__heading h2,
.page-about .about-care__heading h2 {
  font-family: var(--font-headline);
  font-size: clamp(26px, 4vw, 36px);
  color: var(--color-navy);
  margin: 6px 0 12px;
  line-height: 1.25;
}

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

.page-about .about-origin__main p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.9;
  color: #33465a;
  margin-bottom: 16px;
}

.page-about .about-origin__aside {
  background: var(--color-white);
  border: 1px solid var(--color-cloud);
  border-radius: var(--radius-md);
  padding: 24px;
  box-shadow: var(--shadow-card);
}

.page-about .about-origin__aside h3 {
  font-family: var(--font-headline);
  font-size: 18px;
  color: var(--color-navy);
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 16px;
}

.page-about .about-origin__aside h3::before {
  content: '';
  width: 18px;
  height: 2px;
  background: var(--color-gold);
  flex: 0 0 auto;
}

.page-about .about-origin__aside dl {
  display: grid;
  gap: 0;
  margin: 0;
}

.page-about .about-origin__aside dl div {
  display: grid;
  grid-template-columns: 104px 1fr;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-cloud);
}

.page-about .about-origin__aside dl div:last-child {
  border-bottom: none;
}

.page-about .about-origin__aside dt {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--color-royal);
  letter-spacing: 0.06em;
  margin-top: 3px;
}

.page-about .about-origin__aside dd {
  font-family: var(--font-headline);
  font-size: 15px;
  color: var(--color-carbon);
  margin: 0;
}

/* ========== 改版历程 时间线 ========== */
.page-about .about-journey {
  padding: 64px 0 80px;
  background: var(--color-white);
  border-top: 1px solid var(--color-cloud);
  border-bottom: 1px solid var(--color-cloud);
}

.page-about .about-journey__heading {
  max-width: 720px;
  margin-bottom: 36px;
}

.page-about .about-journey__heading h2 {
  font-family: var(--font-headline);
  font-size: clamp(26px, 4vw, 36px);
  color: var(--color-navy);
  margin: 6px 0 12px;
  line-height: 1.25;
}

.page-about .about-journey__visual {
  margin-bottom: 48px;
}

.page-about .about-journey__visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-cloud);
  box-shadow: var(--shadow-card);
}

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

.page-about .about-timeline::before {
  content: '';
  position: absolute;
  left: 18px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(180deg, var(--color-gold) 0%, var(--color-cyan) 62%, var(--color-violet) 100%);
  opacity: 0.55;
  border-radius: 2px;
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 52px;
  margin-bottom: 36px;
}

.page-about .about-timeline__item:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline__num {
  position: absolute;
  left: 18px;
  top: 10px;
  width: 40px;
  height: 40px;
  border-radius: 50%;
  background: var(--color-navy);
  color: var(--color-gold);
  font-family: var(--font-mono);
  font-size: 14px;
  font-weight: 700;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 2px solid var(--color-gold);
  box-shadow: 0 0 0 4px var(--color-white);
  transform: translateX(-50%);
  z-index: 1;
}

.page-about .about-timeline__card {
  background: var(--color-navy);
  border-radius: var(--radius-md);
  padding: 22px 22px 18px;
  color: var(--color-white);
  box-shadow: var(--shadow-card);
  transition: transform var(--transition-fast), box-shadow var(--transition-fast);
}

.page-about .about-timeline__card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-lift);
}

.page-about .about-timeline__card h3 {
  font-family: var(--font-headline);
  font-size: 20px;
  color: var(--color-white);
  margin: 0 0 10px;
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .about-timeline__card h3::before {
  content: '';
  width: 16px;
  height: 2px;
  background: var(--color-gold);
  flex: 0 0 auto;
}

.page-about .about-timeline__card > p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.9);
  margin: 0;
}

.page-about .about-timeline__details {
  border-top: 1px solid rgba(255, 255, 255, 0.16);
  padding-top: 12px;
  margin-top: 14px;
}

.page-about .about-timeline__details summary {
  font-family: var(--font-mono);
  font-size: 13px;
  color: var(--color-gold);
  cursor: pointer;
  list-style: none;
  display: inline-flex;
  align-items: center;
  gap: 8px;
  transition: opacity var(--transition-fast);
}

.page-about .about-timeline__details summary:hover {
  opacity: 0.8;
}

.page-about .about-timeline__details summary::-webkit-details-marker {
  display: none;
}

.page-about .about-timeline__details summary::before {
  content: '↧';
  display: inline-block;
  transition: transform var(--transition-fast);
}

.page-about .about-timeline__details[open] summary::before {
  transform: rotate(180deg);
}

.page-about .about-timeline__details p {
  color: rgba(255, 255, 255, 0.76);
  font-size: 14px;
  line-height: 1.8;
  margin: 10px 0 0;
}

/* ========== 服务承诺 ========== */
.page-about .about-commitment {
  padding: 72px 0;
}

.page-about .about-commitment__heading {
  max-width: 760px;
  margin-bottom: 40px;
}

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

.page-about .about-commitment__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-cloud);
  box-shadow: var(--shadow-card);
}

.page-about .about-commitment__list {
  background: var(--color-white);
  border: 1px solid var(--color-cloud);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.page-about .about-commitment__list h3,
.page-about .about-care__content h3 {
  font-family: var(--font-headline);
  font-size: 22px;
  color: var(--color-navy);
  margin: 0 0 20px;
  position: relative;
  padding-left: 18px;
}

.page-about .about-commitment__list h3::before,
.page-about .about-care__content h3::before {
  content: '';
  position: absolute;
  left: 0;
  top: 4px;
  bottom: 4px;
  width: 4px;
  background: var(--color-gold);
}

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

.page-about .about-commitment__list li {
  padding: 13px 0;
  border-bottom: 1px solid var(--color-cloud);
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: var(--color-carbon);
}

.page-about .about-commitment__list li:last-child {
  border-bottom: none;
}

.page-about .about-commitment__list li strong {
  font-family: var(--font-headline);
  font-size: 15px;
  color: var(--color-navy);
  margin-right: 4px;
}

/* ========== 用户关怀 ========== */
.page-about .about-care {
  padding: 72px 0;
  background: var(--color-cloud);
  border-top: 1px solid var(--color-cloud);
  border-bottom: 1px solid var(--color-cloud);
}

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

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

.page-about .about-care__media img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-white);
  box-shadow: var(--shadow-card);
}

.page-about .about-care__content {
  background: var(--color-white);
  border: 1px solid var(--color-cloud);
  border-radius: var(--radius-md);
  padding: 28px;
  box-shadow: var(--shadow-card);
}

.page-about .about-care__content h3 {
  padding-left: 18px;
  margin-bottom: 16px;
}

.page-about .about-care__content p {
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.8;
  color: #33465a;
  margin: 0 0 16px;
}

.page-about .about-care__content ul {
  list-style: none;
  margin: 0 0 20px;
  padding: 0;
}

.page-about .about-care__content li {
  position: relative;
  padding: 8px 0 8px 24px;
  font-family: var(--font-body);
  font-size: 15px;
  line-height: 1.7;
  color: var(--color-carbon);
}

.page-about .about-care__content li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 17px;
  width: 12px;
  height: 2px;
  background: var(--color-orange);
}

.page-about .about-care__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 12px;
}

/* ========== 底部继续阅读 ========== */
.page-about .about-more {
  padding: 72px 0;
}

.page-about .about-more__panel {
  position: relative;
  background: var(--color-navy);
  border-radius: var(--radius-md);
  padding: 40px 32px;
  color: var(--color-white);
  box-shadow: var(--shadow-card);
  overflow: hidden;
}

.page-about .about-more__panel::after {
  content: '';
  position: absolute;
  right: -40px;
  top: -40px;
  width: 160px;
  height: 160px;
  border: 20px solid rgba(212, 175, 55, 0.16);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-more__panel .index-label {
  color: var(--color-gold);
}

.page-about .about-more__panel h2 {
  font-family: var(--font-headline);
  font-size: clamp(24px, 3.6vw, 32px);
  color: var(--color-white);
  margin: 8px 0 14px;
  line-height: 1.25;
}

.page-about .about-more__panel p {
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.86);
  max-width: 460px;
  margin-bottom: 24px;
}

.page-about .about-more__links {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-more__panel .btn--ghost {
  border-color: rgba(255, 255, 255, 0.7);
  color: var(--color-white);
}

/* ========== 桌面端 ≥768px ========== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 56px 0 72px;
  }

  .page-about .about-hero__grid {
    display: grid;
    grid-template-columns: 1.25fr 0.75fr;
    align-items: center;
    gap: 56px;
  }

  .page-about .about-hero__visual {
    display: flex;
    justify-content: flex-end;
  }

  .page-about .about-hero__frame {
    width: 100%;
    transform: translateY(12px);
  }

  .page-about .about-origin {
    padding: 88px 0 64px;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 1fr 340px;
    gap: 48px;
    align-items: start;
  }

  .page-about .about-origin__aside {
    position: sticky;
    top: 28px;
  }

  .page-about .about-journey {
    padding: 88px 0 96px;
  }

  .page-about .about-journey__heading {
    margin-bottom: 44px;
  }

  .page-about .about-journey__visual {
    margin-bottom: 60px;
  }

  .page-about .about-journey__visual img {
    border-radius: var(--radius-md);
  }

  .page-about .about-timeline {
    --about-timeline-axis: 40%;
  }

  .page-about .about-timeline::before {
    left: var(--about-timeline-axis);
  }

  .page-about .about-timeline__num {
    left: var(--about-timeline-axis);
  }

  .page-about .about-timeline__item {
    width: calc(var(--about-timeline-axis) - var(--about-timeline-gap));
    padding-left: 0;
  }

  .page-about .about-timeline__item:nth-child(even) {
    margin-left: var(--about-timeline-axis);
    width: calc(100% - var(--about-timeline-axis) - var(--about-timeline-gap));
  }

  .page-about .about-timeline__card {
    padding: 24px 26px 20px;
  }

  .page-about .about-timeline__card h3 {
    font-size: 21px;
  }

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

  .page-about .about-commitment__grid {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-commitment__media img {
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lift);
  }

  .page-about .about-commitment__list {
    padding: 36px;
  }

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

  .page-about .about-care__grid {
    grid-template-columns: 1fr 0.9fr;
    gap: 56px;
    align-items: center;
  }

  .page-about .about-care__media {
    order: 2;
  }

  .page-about .about-care__media img {
    border-radius: var(--radius-md);
    transform: rotate(-0.6deg);
    box-shadow: var(--shadow-lift);
  }

  .page-about .about-care__content {
    padding: 36px;
  }

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

  .page-about .about-more__panel {
    padding: 56px 48px;
  }
}