.page-about {
  --about-grid: rgba(46, 74, 110, 0.32);
  --about-orange-wash: rgba(255, 122, 0, 0.09);
  --about-green-glow: rgba(0, 255, 136, 0.12);
  --about-card-pad: 1.75rem;
  background: var(--c-bg);
  color: var(--c-text);
  overflow-x: hidden;
}

/* ===== Hero ===== */
.page-about .about-hero {
  position: relative;
  padding: 2.5rem 0 3.5rem;
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 48px 48px;
  background-position: center top;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -120px;
  right: -80px;
  width: 300px;
  height: 300px;
  background: var(--about-orange-wash);
  transform: rotate(12deg);
  pointer-events: none;
}

.page-about .about-hero__inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
  position: relative;
  z-index: 1;
}

.page-about .about-hero__content {
  max-width: 720px;
}

.page-about .breadcrumbs {
  margin-bottom: 1.25rem;
}

.page-about .breadcrumbs__list {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
  font-family: var(--f-mono);
  font-size: 0.875rem;
}

.page-about .breadcrumbs__link {
  color: var(--c-muted);
  text-decoration: none;
  transition: color 0.2s ease;
}

.page-about .breadcrumbs__link:hover {
  color: var(--c-accent);
}

.page-about .breadcrumbs__current {
  color: var(--c-text);
}

.page-about .breadcrumbs__sep {
  color: var(--c-border);
}

.page-about .about-hero__tag {
  margin-bottom: 1rem;
}

.page-about .about-hero__title {
  font-family: var(--f-head);
  font-size: clamp(2rem, 5vw, 3.5rem);
  line-height: 1.1;
  margin: 0 0 1.25rem;
  letter-spacing: -0.02em;
}

.page-about .about-hero__lead {
  font-family: var(--f-body);
  font-size: 1.0625rem;
  line-height: 1.8;
  color: var(--c-muted);
  margin-bottom: 1.75rem;
  max-width: 620px;
}

.page-about .about-hero__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.25rem 2.25rem;
  margin-bottom: 1.75rem;
}

.page-about .about-hero__anchor {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem 1.5rem;
  border-top: 1px solid var(--c-border);
  padding-top: 1rem;
}

.page-about .about-hero__anchor a {
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  color: var(--c-muted);
  text-decoration: none;
  letter-spacing: 0.04em;
  transition: color 0.2s ease;
}

.page-about .about-hero__anchor a:hover {
  color: var(--c-highlight);
}

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

.page-about .about-hero__img {
  position: relative;
  border: 1px solid var(--c-border);
  overflow: hidden;
  background: var(--c-surface);
}

.page-about .about-hero__photo {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  filter: contrast(1.1) saturate(0.9);
}

.page-about .about-hero__media-note {
  font-family: var(--f-mono);
  font-size: 0.8125rem;
  color: var(--c-muted);
  margin-top: 0.875rem;
  padding-left: 0.875rem;
  border-left: 2px solid var(--c-highlight);
  line-height: 1.6;
}

/* ===== 通用章节 ===== */
.page-about .about-section {
  padding: 3rem 0;
}

.page-about .about-section__num {
  display: block;
  font-family: var(--f-mono);
  font-size: 3rem;
  font-weight: 700;
  color: var(--c-accent);
  line-height: 1;
  margin-bottom: 0.625rem;
}

.page-about .about-section__title {
  font-family: var(--f-head);
  font-size: clamp(1.75rem, 3.5vw, 2.75rem);
  line-height: 1.15;
  margin: 0 0 0.5rem;
}

.page-about .about-section__hint {
  font-family: var(--f-body);
  color: var(--c-muted);
  font-size: 0.9375rem;
  line-height: 1.6;
  margin-bottom: 1.5rem;
}

/* ===== 品牌起源 ===== */
.page-about .about-origin {
  background: var(--c-bg-deep);
  border-top: 1px solid var(--c-border);
  border-bottom: 1px solid var(--c-border);
}

.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}

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

.page-about .about-origin__body .lead {
  font-size: 1.0625rem;
  line-height: 1.8;
  margin-bottom: 1rem;
}

.page-about .about-origin__body p:not(.lead) {
  color: var(--c-muted);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.page-about .about-origin__facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 0.875rem;
  margin-top: 2rem;
}

.page-about .about-origin__fact {
  padding: 1.5rem 1.25rem;
}

.page-about .about-origin__fact-num {
  display: block;
  font-family: var(--f-mono);
  font-size: 1.75rem;
  font-weight: 700;
  color: var(--c-highlight);
  margin-bottom: 0.375rem;
}

.page-about .about-origin__fact-label {
  font-size: 0.8125rem;
  color: var(--c-muted);
  line-height: 1.5;
}

/* ===== 发展里程碑 ===== */
.page-about .about-milestones {
  position: relative;
  background-image:
    linear-gradient(var(--about-grid) 1px, transparent 1px),
    linear-gradient(90deg, var(--about-grid) 1px, transparent 1px);
  background-size: 56px 56px;
}

.page-about .about-milestones::after {
  content: "";
  position: absolute;
  top: 8%;
  right: -80px;
  width: 240px;
  height: 240px;
  background: var(--about-green-glow);
  transform: rotate(15deg);
  border-radius: 50%;
  filter: blur(60px);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-milestones__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2.5rem;
  position: relative;
  z-index: 1;
}

.page-about .about-milestones__content .lead {
  margin-bottom: 1rem;
}

.page-about .about-milestones__content p:not(.lead) {
  color: var(--c-muted);
  line-height: 1.8;
  margin-bottom: 1.5rem;
}

.page-about .about-milestones__chart-wrap {
  border: 1px solid var(--c-border);
  background: var(--c-surface);
  margin-top: 1.5rem;
}

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

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

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--c-border);
}

.page-about .about-timeline__item {
  position: relative;
  padding-left: 2.5rem;
  margin-bottom: 1.875rem;
}

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

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: 3px;
  top: 6px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--c-highlight);
  box-shadow: 0 0 0 4px rgba(0, 255, 136, 0.18);
}

.page-about .about-timeline__year {
  font-family: var(--f-mono);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--c-accent);
  display: block;
  margin-bottom: 0.375rem;
}

.page-about .about-timeline__card {
  background: var(--c-surface);
  border: 1px solid var(--c-border);
  padding: 1.25rem;
}

.page-about .about-timeline__name {
  font-family: var(--f-body);
  font-size: 1.0625rem;
  font-weight: 700;
  margin: 0 0 0.375rem;
}

.page-about .about-timeline__card p {
  font-size: 0.9375rem;
  color: var(--c-muted);
  line-height: 1.7;
  margin: 0;
}

/* ===== 服务承诺 ===== */
.page-about .about-commitment {
  background: var(--c-bg-deep);
  border-top: 1px solid var(--c-border);
}

.page-about .about-commitment__head {
  margin-bottom: 2rem;
}

.page-about .about-commitment__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .about-commitment__card {
  padding: var(--about-card-pad);
  border: 1px solid var(--c-border);
  border-top: 3px solid var(--c-accent);
}

.page-about .about-commitment__card--green {
  border-top-color: var(--c-highlight);
}

.page-about .about-commitment__card-title {
  font-family: var(--f-body);
  font-size: 1.25rem;
  font-weight: 700;
  margin: 0 0 1rem;
}

.page-about .about-commitment__card p {
  color: var(--c-muted);
  font-size: 0.9375rem;
  line-height: 1.8;
  margin-bottom: 0.875rem;
}

.page-about .about-commitment__shield-wrap {
  border: 1px solid var(--c-border);
  background: var(--c-primary);
  margin-top: 1rem;
  overflow: hidden;
}

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

/* ===== 延伸阅读 ===== */
.page-about .about-links {
  padding: 3.5rem 0;
  position: relative;
}

.page-about .about-links__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}

.page-about .about-links__item {
  background: var(--c-surface);
  padding: 2rem 1.75rem;
  border: 1px solid var(--c-border);
  border-left: 4px solid var(--c-accent);
  transition: transform 0.2s ease, border-color 0.2s ease;
}

.page-about .about-links__item:nth-child(2) {
  border-left-color: var(--c-highlight);
}

.page-about .about-links__item:nth-child(3) {
  border-left-color: var(--c-warning);
}

.page-about .about-links__item:hover {
  transform: translateY(-3px);
  border-color: var(--c-text);
}

.page-about .about-links__num {
  font-family: var(--f-mono);
  color: var(--c-accent);
  font-size: 0.875rem;
  display: block;
  margin-bottom: 0.75rem;
}

.page-about .about-links__item:nth-child(2) .about-links__num {
  color: var(--c-highlight);
}

.page-about .about-links__item:nth-child(3) .about-links__num {
  color: var(--c-warning);
}

.page-about .about-links__title {
  font-family: var(--f-head);
  font-size: 1.375rem;
  margin: 0 0 0.5rem;
}

.page-about .about-links__item p {
  color: var(--c-muted);
  font-size: 0.9375rem;
  line-height: 1.7;
  margin-bottom: 1.5rem;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 4rem 0 5rem;
  }

  .page-about .about-hero__inner {
    grid-template-columns: 3fr 2fr;
    gap: 3rem;
  }

  .page-about .about-hero__title {
    font-size: clamp(2.5rem, 5vw, 3.75rem);
  }

  .page-about .about-section {
    padding: 5rem 0;
  }

  .page-about .about-section__num {
    font-size: 4rem;
  }

  .page-about .about-origin__grid {
    grid-template-columns: 1fr 2fr;
    gap: 3.5rem;
  }

  .page-about .about-milestones__grid {
    grid-template-columns: 1fr 1fr;
    gap: 3.5rem;
  }

  .page-about .about-commitment__head {
    display: grid;
    grid-template-columns: 1fr 2fr;
    align-items: end;
    gap: 2rem;
    margin-bottom: 3rem;
  }

  .page-about .about-commitment__head .about-section__hint {
    text-align: right;
    margin-bottom: 0.375rem;
  }

  .page-about .about-commitment__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .about-links__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
}