.page-about {
  --about-red: #C3272B;
  --about-gold: #E9B872;
  background: var(--color-primary);
  color: var(--color-surface);
  font-family: var(--font-body);
  line-height: 1.8;
  overflow-x: hidden;
}

/* 面包屑 */
.page-about .about-breadcrumb {
  padding: 0.75rem 1.25rem;
  font-family: var(--font-index);
  font-size: 0.875rem;
  color: rgba(245, 245, 240, 0.72);
}
.page-about .about-breadcrumb__container {
  max-width: var(--container-width);
  margin-inline: auto;
  display: flex;
  align-items: center;
  gap: 0.5rem;
}
.page-about .about-breadcrumb a {
  color: rgba(245, 245, 240, 0.82);
  text-decoration: none;
  border-bottom: 1px solid rgba(233, 184, 114, 0.55);
  transition: color 0.2s ease;
}
.page-about .about-breadcrumb a:hover { color: var(--about-gold); }
.page-about .about-breadcrumb .breadcrumb__current { color: rgba(245, 245, 240, 0.9); }

/* 品牌故事 */
.page-about .about-story {
  position: relative;
  display: flex;
  align-items: center;
  overflow: hidden;
  padding: 4rem 1.25rem 5rem;
}
.page-about .about-story__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}
.page-about .about-story__shade {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(100deg, rgba(11, 27, 58, 0.96) 0%, rgba(11, 27, 58, 0.82) 52%, rgba(11, 27, 58, 0.28) 88%);
}
.page-about .about-story__content {
  position: relative;
  z-index: 2;
  max-width: 680px;
}
.page-about .about-story__kicker {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.8rem;
  letter-spacing: 0.3em;
  text-transform: uppercase;
  color: var(--about-gold);
  margin-bottom: 1rem;
}
.page-about .about-story h1 {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(2rem, 6vw, 3.25rem);
  line-height: 1.12;
  letter-spacing: -0.02em;
  margin: 0 0 1.25rem;
  color: #ffffff;
}
.page-about .about-story__lead {
  font-size: 1.125rem;
  line-height: 1.65;
  color: rgba(245, 245, 240, 0.85);
  margin: 0 0 1.1rem;
}
.page-about .about-story__body {
  font-size: 1rem;
  color: rgba(245, 245, 240, 0.88);
  margin: 0;
}
.page-about .about-story__meta {
  display: inline-block;
  margin-top: 1.75rem;
  padding: 0.5rem 1rem;
  border-left: 3px solid var(--about-red);
  background: rgba(11, 27, 58, 0.35);
  font-family: var(--font-index);
  font-size: 0.85rem;
  letter-spacing: 0.03em;
  color: rgba(245, 245, 240, 0.78);
}

/* 主体布局 */
.page-about .about-layout {
  max-width: var(--container-width);
  margin-inline: auto;
  padding: 2rem 1.25rem 3.5rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
}
.page-about .about-main {
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
}
.page-about .about-section-head {
  margin-bottom: 1.5rem;
}
.page-about .about-section-head .section__kicker,
.page-about .about-tibet__content .section__kicker {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.78rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--about-gold);
  margin: 0 0 0.5rem;
}
.page-about .about-section-head .section__title,
.page-about .about-tibet__content .section__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.45rem, 3vw, 1.95rem);
  line-height: 1.25;
  letter-spacing: -0.01em;
  color: #ffffff;
  margin: 0;
}
.page-about .about-tibet__content .section__title {
  color: #0b1b3a;
  margin-bottom: 1rem;
}

/* 左侧目录 */
.page-about .about-rail {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding: 1.25rem 0;
}
.page-about .about-rail__title {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 0.75rem;
  letter-spacing: 0.24em;
  text-transform: uppercase;
  color: var(--about-gold);
  margin-bottom: 0.6rem;
}
.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1rem;
}
.page-about .about-rail__list a {
  font-family: var(--font-index);
  font-size: 0.88rem;
  color: rgba(245, 245, 240, 0.72);
  text-decoration: none;
  border-bottom: 2px solid transparent;
  padding-bottom: 2px;
  transition: color 0.2s ease, border-color 0.2s ease;
}
.page-about .about-rail__list a:hover {
  color: var(--about-gold);
  border-bottom-color: var(--about-gold);
}
.page-about .about-rail__years { display: none; }

/* 规模数字 */
.page-about .about-numbers {
  background: var(--color-surface);
  color: #24304a;
  border-radius: var(--radius);
  padding: 2rem 1.25rem;
  scroll-margin-top: 1.25rem;
}
.page-about .about-numbers .about-section-head .section__kicker { color: var(--about-red); }
.page-about .about-numbers .about-section-head .section__title { color: #0b1b3a; }
.page-about .about-numbers__stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 0.9rem;
}
.page-about .about-stat {
  background: #ffffff;
  border-left: 4px solid var(--about-red);
  border-radius: 10px;
  padding: 1.15rem 1rem 1rem;
  box-shadow: 0 4px 16px rgba(11, 27, 58, 0.07);
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.page-about .about-stat:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 24px rgba(11, 27, 58, 0.13);
}
.page-about .about-stat__num {
  display: block;
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: clamp(1.3rem, 3.6vw, 1.85rem);
  line-height: 1.15;
  color: #0b1b3a;
}
.page-about .about-stat__label {
  display: block;
  margin-top: 0.3rem;
  font-family: var(--font-index);
  font-size: 0.82rem;
  color: #6b7280;
}
.page-about .about-numbers__bottom {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}
.page-about .about-chart {
  position: relative;
  margin: 0;
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--about-red);
  line-height: 0;
}
.page-about .about-chart img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
}
.page-about .about-chart__tip {
  position: absolute;
  left: 1rem;
  bottom: 1rem;
  z-index: 2;
  background: rgba(11, 27, 58, 0.9);
  color: #f5f5f0;
  font-family: var(--font-index);
  font-size: 0.78rem;
  padding: 0.4rem 0.85rem;
  border-radius: 999px;
  border: 1px solid rgba(233, 184, 114, 0.5);
  opacity: 0;
  transform: translateY(6px);
  transition: opacity 0.25s ease, transform 0.25s ease;
  pointer-events: none;
  line-height: 1.4;
}
.page-about .about-chart:hover .about-chart__tip {
  opacity: 1;
  transform: translateY(0);
}
.page-about .about-numbers__note {
  font-size: 0.94rem;
  color: #2a3550;
}
.page-about .about-numbers__note p + p { margin-top: 0.9rem; }

/* 发展里程碑 */
.page-about .about-timeline {
  background: var(--color-teal);
  color: #f5f5f0;
  border-radius: var(--radius);
  padding: 2.5rem 1.25rem;
  position: relative;
  overflow: hidden;
  scroll-margin-top: 1.25rem;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: -60px;
  right: -60px;
  width: 160px;
  height: 160px;
  border-radius: 50%;
  background: rgba(233, 184, 114, 0.1);
}
.page-about .about-timeline__track {
  position: relative;
  margin-top: 2rem;
  padding-left: 1.5rem;
}
.page-about .about-timeline__track::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: rgba(245, 245, 240, 0.2);
}
.page-about .about-timeline__item {
  position: relative;
  padding-left: 1.4rem;
  padding-bottom: 2.25rem;
}
.page-about .about-timeline__item:last-child { padding-bottom: 0; }
.page-about .about-timeline__marker {
  position: absolute;
  left: 1px;
  top: 0.4rem;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--about-gold);
  border: 3px solid #ffffff;
  box-shadow: 0 0 0 3px rgba(233, 184, 114, 0.3);
}
.page-about .about-timeline__year {
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1.35rem;
  color: var(--about-gold);
  margin-bottom: 0.35rem;
}
.page-about .about-timeline__card h3 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.12rem;
  color: #ffffff;
  margin: 0 0 0.45rem;
}
.page-about .about-timeline__card p {
  font-size: 0.93rem;
  color: rgba(245, 245, 240, 0.82);
}

/* 资质认证 */
.page-about .about-credentials {
  background: var(--color-purple);
  color: #f5f5f0;
  border-radius: var(--radius);
  padding: 2.5rem 1.25rem;
  scroll-margin-top: 1.25rem;
}
.page-about .about-credentials__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-top: 2rem;
}
.page-about .about-credential {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 255, 255, 0.12);
  border-radius: var(--radius);
  padding: 1.5rem 1.25rem;
  transition: background 0.25s ease, transform 0.25s ease;
}
.page-about .about-credential:hover {
  background: rgba(255, 255, 255, 0.1);
  transform: translateY(-3px);
}
.page-about .about-credential__icon {
  display: inline-grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border-radius: 10px;
  background: rgba(233, 184, 114, 0.15);
  border: 1px solid rgba(233, 184, 114, 0.4);
  color: var(--about-gold);
  font-family: var(--font-heading);
  font-weight: 900;
  font-size: 1rem;
  margin-bottom: 0.9rem;
}
.page-about .about-credential h3 {
  font-family: var(--font-heading);
  font-weight: 800;
  font-size: 1.05rem;
  color: #ffffff;
  margin: 0 0 0.45rem;
}
.page-about .about-credential p {
  font-size: 0.9rem;
  color: rgba(245, 245, 240, 0.78);
  margin: 0;
}

/* 西藏服务 */
.page-about .about-tibet {
  background: var(--color-surface);
  color: #1e2940;
  border-radius: var(--radius);
  padding: 2rem 1.25rem;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  scroll-margin-top: 1.25rem;
}
.page-about .about-tibet__media {
  border-radius: var(--radius);
  overflow: hidden;
  position: relative;
  line-height: 0;
}
.page-about .about-tibet__media img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  transition: transform 0.35s ease;
}
.page-about .about-tibet__media:hover img { transform: scale(1.03); }
.page-about .about-tibet__content .section__kicker { color: var(--about-red); }
.page-about .about-tibet__content p {
  font-size: 0.95rem;
  color: #2a3550;
}
.page-about .about-tibet__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.5rem;
}
.page-about .about-tibet .btn--outline {
  border-color: #0b1b3a;
  color: #0b1b3a;
}
.page-about .about-tibet .btn--outline:hover {
  background: #0b1b3a;
  color: #f5f5f0;
}

/* 桌面端与较大宽度 */
@media (min-width: 640px) {
  .page-about .about-numbers { padding: 2.5rem 2rem; }
  .page-about .about-numbers__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
  }
  .page-about .about-credentials { padding: 3rem 2rem; }
  .page-about .about-credentials__grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 760px) {
  .page-about .about-numbers__bottom {
    grid-template-columns: 0.95fr 1.05fr;
    align-items: center;
    gap: 2rem;
  }
  .page-about .about-tibet {
    grid-template-columns: 0.9fr 1.1fr;
    padding: 2.5rem;
    align-items: center;
    gap: 2.25rem;
  }
}

@media (min-width: 860px) {
  .page-about .about-story {
    min-height: 560px;
    padding: 5rem max(1.5rem, calc((100vw - var(--container-width)) / 2)) 5.5rem;
  }
  .page-about .about-story__content { max-width: 660px; }
  .page-about .about-story__lead { font-size: 1.25rem; }

  .page-about .about-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 2.75rem;
    padding: 2.75rem 1.5rem 4.5rem;
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 1.25rem;
    padding: 1.75rem 1.5rem 0.5rem 0;
    border-right: 1px solid rgba(245, 245, 240, 0.12);
  }
  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0.7rem;
  }
  .page-about .about-rail__years {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 0.5rem;
    margin-top: 2rem;
  }
  .page-about .about-rail__year-dot {
    font-family: var(--font-heading);
    font-weight: 900;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
    color: var(--about-gold);
    border: 1px solid rgba(233, 184, 114, 0.45);
    border-radius: 999px;
    padding: 0.2rem 0.7rem;
  }
  .page-about .about-rail__line {
    width: 1px;
    height: 44px;
    margin-left: 1.4rem;
    background: repeating-linear-gradient(
      to bottom,
      rgba(233, 184, 114, 0.5) 0 4px,
      transparent 4px 8px
    );
  }
  .page-about .about-rail__caption {
    font-family: var(--font-index);
    font-size: 0.75rem;
    letter-spacing: 0.18em;
    text-transform: uppercase;
    color: rgba(245, 245, 240, 0.42);
  }

  .page-about .about-main { gap: 3rem; }
}