.page-about {
  --about-accent: var(--color-primary-red, #E63946);
  --about-accent2: var(--color-primary-orange, #F4A261);
  --about-bg-alt: #0F111A;
  --about-divider-angle: -6deg;
  --about-timeline-width: 3px;
  display: block;
  width: 100%;
  max-width: 100%;
  overflow-x: hidden;
  background: var(--color-bg-dark, #0B0C10);
  color: var(--color-text-primary, #FFFFFF);
  font-family: var(--font-body, 'Noto Sans SC', system-ui, sans-serif);
}

/* ===== 面包屑 ===== */
.about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.25rem;
  font-size: 0.8rem;
  color: var(--color-text-secondary, #A8DADC);
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}
.about-breadcrumb a {
  color: var(--color-accent-silver, #C0C0C0);
  text-decoration: none;
  transition: color 0.2s;
}
.about-breadcrumb a:hover {
  color: var(--about-accent);
}
.about-breadcrumb__sep {
  color: var(--color-accent-silver, #C0C0C0);
  opacity: 0.5;
}

/* ===== Hero ===== */
.about-hero {
  position: relative;
  width: 100%;
  height: clamp(320px, 60vw, 560px);
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
}
.about-hero__img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
  filter: saturate(1.1) contrast(1.05);
}
.about-hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(135deg, rgba(230,57,70,0.65) 0%, rgba(244,162,97,0.35) 60%, rgba(13,15,20,0.85) 100%);
  pointer-events: none;
}
.about-hero__content {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 1.5rem;
  max-width: 800px;
}
.about-hero__title {
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-weight: var(--weight-heading, 800);
  font-size: clamp(2rem, 8vw, 4.2rem);
  letter-spacing: var(--letter-spacing-heading, 0.15em);
  margin: 0 0 0.5rem;
  background: var(--gradient-highlight, linear-gradient(135deg, #E63946, #F4A261));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
  text-shadow: none;
  line-height: 1.1;
}
.about-hero__subtitle {
  font-size: clamp(0.9rem, 2.5vw, 1.3rem);
  letter-spacing: 0.2em;
  color: var(--color-accent-silver, #C0C0C0);
  text-transform: uppercase;
  margin: 0 0 0.75rem;
  font-weight: 300;
}
.about-hero__desc {
  font-size: clamp(0.95rem, 2vw, 1.15rem);
  color: var(--color-text-secondary, #A8DADC);
  max-width: 600px;
  margin: 0 auto;
  line-height: var(--line-height-body, 1.6);
  opacity: 0.9;
}

/* ===== 左右分屏容器 ===== */
.about-split {
  position: relative;
  display: flex;
  flex-direction: column;
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
  padding: 2rem 1.25rem 3rem;
  gap: 3rem;
}
.about-split__divider {
  display: none;
}

/* ===== 品牌故事 · 时间轴 ===== */
.about-story__heading {
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-weight: var(--weight-heading, 800);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  letter-spacing: var(--letter-spacing-heading, 0.15em);
  color: var(--about-accent);
  margin: 0 0 0.75rem;
  position: relative;
  display: inline-block;
}
.about-story__heading::after {
  content: '';
  display: block;
  width: 60%;
  height: 4px;
  background: var(--gradient-highlight, linear-gradient(135deg, #E63946, #F4A261));
  margin-top: 0.4rem;
  border-radius: 2px;
}
.about-story__intro p {
  font-size: 0.95rem;
  line-height: var(--line-height-body, 1.6);
  color: var(--color-text-secondary, #A8DADC);
  max-width: 480px;
  margin: 0 0 2rem;
}

/* 时间轴 */
.about-timeline {
  position: relative;
  padding-left: 2.5rem;
}
.about-timeline::before {
  content: '';
  position: absolute;
  top: 0;
  left: 0.6rem;
  width: var(--about-timeline-width, 3px);
  height: 100%;
  background: linear-gradient(180deg, var(--about-accent) 0%, var(--about-accent2) 60%, transparent 100%);
  border-radius: 2px;
}
.about-timeline__item {
  position: relative;
  margin-bottom: 2rem;
  padding-left: 0.25rem;
}
.about-timeline__item:last-child {
  margin-bottom: 0;
}
.about-timeline__dot {
  position: absolute;
  left: -2.15rem;
  top: 0.35rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--about-accent);
  border: 3px solid var(--color-bg-dark, #0B0C10);
  box-shadow: 0 0 0 2px var(--about-accent);
  z-index: 1;
}
.about-timeline__year {
  display: inline-block;
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.12em;
  color: var(--about-accent2);
  text-transform: uppercase;
  margin-bottom: 0.25rem;
  padding: 0.15rem 0.5rem;
  background: rgba(244,162,97,0.12);
  border-radius: 4px;
}
.about-timeline__title {
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 0.3rem;
}
.about-timeline__text {
  font-size: 0.88rem;
  line-height: var(--line-height-body, 1.6);
  color: var(--color-text-secondary, #A8DADC);
  margin: 0;
  max-width: 360px;
}

/* ===== 数据覆盖 ===== */
.about-coverage__heading {
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-weight: var(--weight-heading, 800);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  letter-spacing: var(--letter-spacing-heading, 0.15em);
  color: var(--about-accent2);
  margin: 0 0 0.5rem;
  position: relative;
  display: inline-block;
}
.about-coverage__heading::after {
  content: '';
  display: block;
  width: 60%;
  height: 4px;
  background: var(--gradient-highlight, linear-gradient(135deg, #E63946, #F4A261));
  margin-top: 0.4rem;
  border-radius: 2px;
}
.about-coverage__intro {
  font-size: 0.95rem;
  color: var(--color-text-secondary, #A8DADC);
  margin: 0 0 1.5rem;
  max-width: 480px;
}
.about-coverage__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.about-coverage__card {
  padding: 1.25rem 1.25rem 1rem;
  border-radius: 12px;
  background: rgba(255,255,255,0.06);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border: 1px solid rgba(255,255,255,0.08);
  transition: transform 0.25s, box-shadow 0.25s, border-color 0.25s;
  cursor: default;
}
.about-coverage__card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 32px rgba(230,57,70,0.15);
  border-color: rgba(230,57,70,0.3);
}
.about-coverage__icon {
  color: var(--about-accent);
  margin-bottom: 0.5rem;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-coverage__card-title {
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 0.35rem;
  letter-spacing: 0.05em;
}
.about-coverage__card-text {
  font-size: 0.85rem;
  line-height: var(--line-height-body, 1.6);
  color: var(--color-text-secondary, #A8DADC);
  margin: 0 0 0.75rem;
}
.about-coverage__badge {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  letter-spacing: 0.08em;
  padding: 0.15rem 0.6rem;
  border-radius: 20px;
  background: rgba(244,162,97,0.15);
  color: var(--about-accent2);
  text-transform: uppercase;
}
.about-coverage__extra {
  margin-top: 1.5rem;
  border-radius: 12px;
  overflow: hidden;
}
.about-coverage__map {
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
  display: block;
  border-radius: 12px;
}

/* ===== 服务理念 ===== */
.about-philosophy {
  width: 100%;
  background: var(--about-bg-alt, #0F111A);
  padding: 3rem 1.25rem;
}
.about-philosophy__inner {
  max-width: var(--max-width, 1280px);
  margin: 0 auto;
}
.about-philosophy__heading {
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-weight: var(--weight-heading, 800);
  font-size: clamp(1.6rem, 4vw, 2.4rem);
  letter-spacing: var(--letter-spacing-heading, 0.15em);
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 0.5rem;
  position: relative;
  display: inline-block;
}
.about-philosophy__heading::after {
  content: '';
  display: block;
  width: 60%;
  height: 4px;
  background: var(--gradient-highlight, linear-gradient(135deg, #E63946, #F4A261));
  margin-top: 0.4rem;
  border-radius: 2px;
}
.about-philosophy__tagline {
  font-size: 1rem;
  color: var(--color-accent-silver, #C0C0C0);
  margin: 0 0 2rem;
  max-width: 500px;
  letter-spacing: 0.04em;
}
.about-philosophy__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
  margin-bottom: 2rem;
}
.about-philosophy__card {
  padding: 1.5rem;
  border-radius: 12px;
  background: rgba(255,255,255,0.04);
  border: 1px solid rgba(255,255,255,0.06);
  transition: background 0.3s, border-color 0.3s;
  position: relative;
}
.about-philosophy__card:hover {
  background: rgba(230,57,70,0.08);
  border-color: rgba(230,57,70,0.2);
}
.about-philosophy__number {
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-weight: 800;
  font-size: 2.4rem;
  line-height: 1;
  color: rgba(230,57,70,0.2);
  margin-bottom: 0.25rem;
  letter-spacing: -0.05em;
}
.about-philosophy__card-title {
  font-family: var(--font-heading, 'Inter', system-ui, sans-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text-primary, #FFFFFF);
  margin: 0 0 0.4rem;
  letter-spacing: 0.06em;
}
.about-philosophy__card-text {
  font-size: 0.88rem;
  line-height: var(--line-height-body, 1.6);
  color: var(--color-text-secondary, #A8DADC);
  margin: 0;
}
.about-philosophy__media {
  border-radius: 12px;
  overflow: hidden;
}
.about-philosophy__img {
  width: 100%;
  height: auto;
  max-height: 240px;
  object-fit: cover;
  display: block;
  border-radius: 12px;
}

/* ===== 底部CTA ===== */
.about-cta {
  padding: 2.5rem 1.25rem 3rem;
  text-align: center;
}
.about-cta__inner {
  max-width: 600px;
  margin: 0 auto;
}
.about-cta__text {
  font-size: 1.05rem;
  color: var(--color-text-secondary, #A8DADC);
  margin: 0 0 1.5rem;
  line-height: var(--line-height-body, 1.6);
}
.about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}
.about-cta__actions .btn {
  min-width: 160px;
}

/* ===== 桌面端 (≥768px) ===== */
@media (min-width: 768px) {
  .about-breadcrumb {
    padding: 1.25rem 2rem;
  }
  .about-hero {
    height: clamp(400px, 50vw, 640px);
  }
  .about-hero__content {
    padding: 2rem;
  }
  .about-split {
    flex-direction: row;
    padding: 3rem 2rem 4rem;
    gap: 0;
    position: relative;
  }
  .about-split__left {
    flex: 0 0 42%;
    padding-right: 3rem;
    position: relative;
    z-index: 1;
  }
  .about-split__right {
    flex: 0 0 58%;
    padding-left: 3rem;
    position: relative;
    z-index: 1;
  }
  .about-split__divider {
    display: block;
    position: absolute;
    left: 42%;
    top: 0;
    bottom: 0;
    width: 2px;
    background: linear-gradient(180deg, transparent 0%, var(--about-accent) 20%, var(--about-accent2) 50%, transparent 80%);
    transform: skewX(var(--about-divider-angle, -6deg));
    z-index: 0;
    opacity: 0.5;
  }
  .about-timeline {
    padding-left: 2.8rem;
  }
  .about-timeline::before {
    left: 0.7rem;
  }
  .about-timeline__dot {
    left: -2.35rem;
    width: 14px;
    height: 14px;
  }
  .about-coverage__grid {
    grid-template-columns: 1fr 1fr;
  }
  .about-philosophy {
    padding: 4rem 2rem;
  }
  .about-philosophy__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }
  .about-philosophy__media {
    max-width: 500px;
    margin: 0 auto;
  }
  .about-cta {
    padding: 3rem 2rem 4rem;
  }
}

/* ===== 大桌面端 (≥1024px) ===== */
@media (min-width: 1024px) {
  .about-breadcrumb {
    padding: 1.5rem 2rem;
  }
  .about-split {
    padding: 4rem 2rem 5rem;
  }
  .about-split__left {
    flex: 0 0 40%;
    padding-right: 4rem;
  }
  .about-split__right {
    flex: 0 0 60%;
    padding-left: 4rem;
  }
  .about-split__divider {
    left: 40%;
  }
  .about-coverage__grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }
  .about-philosophy {
    padding: 5rem 2rem;
  }
  .about-philosophy__grid {
    gap: 2rem;
  }
}

/* ===== 滚动显现动画 ===== */
@media (prefers-reduced-motion: no-preference) {
  .page-about .scroll-reveal {
    opacity: 0;
    transform: translateY(30px);
    transition: opacity 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94), transform 0.6s cubic-bezier(0.25, 0.46, 0.45, 0.94);
  }
  .page-about .scroll-reveal.is-visible {
    opacity: 1;
    transform: translateY(0);
  }
  .about-timeline__item.scroll-reveal {
    transition-delay: 0.1s;
  }
  .about-timeline__item.scroll-reveal:nth-child(2) { transition-delay: 0.15s; }
  .about-timeline__item.scroll-reveal:nth-child(3) { transition-delay: 0.2s; }
  .about-timeline__item.scroll-reveal:nth-child(4) { transition-delay: 0.25s; }
  .about-coverage__card.scroll-reveal:nth-child(1) { transition-delay: 0.05s; }
  .about-coverage__card.scroll-reveal:nth-child(2) { transition-delay: 0.1s; }
  .about-coverage__card.scroll-reveal:nth-child(3) { transition-delay: 0.15s; }
  .about-coverage__card.scroll-reveal:nth-child(4) { transition-delay: 0.2s; }
  .about-philosophy__card.scroll-reveal:nth-child(1) { transition-delay: 0.05s; }
  .about-philosophy__card.scroll-reveal:nth-child(2) { transition-delay: 0.1s; }
  .about-philosophy__card.scroll-reveal:nth-child(3) { transition-delay: 0.15s; }
}
@media (prefers-reduced-motion: reduce) {
  .page-about .scroll-reveal {
    opacity: 1;
    transform: none;
    transition: none;
  }
}

.page-about {
  --line-height-body: 1.6;
}