.page-about {
  --about-red: #E63946;
  --about-blue: #1D3557;
  --about-orange: #F4A261;
  --about-green: #2A9D8F;
  --about-terracotta: #E76F51;
  --about-bg: #0B1015;
  --about-text: #F1FAEE;
  --about-gray: #8D99AE;
  --about-accent-shadow: 6px 6px 0 rgba(230, 57, 70, 0.2);
  --about-card-shadow: 6px 6px 0 rgba(29, 53, 87, 0.4);
  --about-border-thick: 3px solid var(--about-red);
  --about-radius: 6px;
  --about-transition: 0.3s cubic-bezier(0.4, 0, 0.2, 1);
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding-top: 1.25rem;
  padding-bottom: 0.5rem;
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 0.85rem;
  color: var(--about-gray);
}
.page-about .breadcrumb a {
  color: var(--about-gray);
  text-decoration: none;
  transition: color var(--about-transition);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--about-red);
  text-decoration: underline;
}
.page-about .breadcrumb .sep {
  color: var(--about-red);
  font-weight: 700;
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--about-text);
  font-weight: 600;
}

/* ===== Hero 区域 ===== */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  min-height: 340px;
  display: flex;
  align-items: center;
  border-bottom: 4px solid var(--about-red);
  margin-bottom: 0;
}
.page-about .about-hero__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  z-index: 0;
}
.page-about .about-hero__overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(135deg, rgba(11, 16, 21, 0.88) 30%, rgba(11, 16, 21, 0.55) 70%, rgba(230, 57, 70, 0.25) 100%);
}
.page-about .about-hero__inner {
  position: relative;
  z-index: 2;
  display: flex;
  flex-direction: column;
  gap: 1rem;
  padding-top: 2rem;
  padding-bottom: 2.5rem;
  width: 100%;
}
.page-about .about-hero__left {
  flex: 0 0 auto;
}
.page-about .about-hero__right {
  flex: 1 1 auto;
}
.page-about .about-hero__tagline {
  display: inline-block;
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 1.4rem;
  letter-spacing: 0.08em;
  color: var(--about-orange);
  background: rgba(244, 162, 97, 0.12);
  padding: 0.25rem 1rem;
  border-left: 4px solid var(--about-orange);
  text-transform: uppercase;
}
.page-about .about-hero__title {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 3.2rem;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--about-text);
  margin: 0 0 0.4rem;
  text-transform: uppercase;
  word-break: break-word;
}
.page-about .about-hero__sub {
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 1.05rem;
  line-height: 1.5;
  color: var(--about-gray);
  max-width: 480px;
  margin: 0 0 0.75rem;
}
.page-about .about-hero__deco-line {
  width: 80px;
  height: 4px;
  background: var(--about-red);
  border-radius: 2px;
}

/* ===== 通用章节 ===== */
.page-about .section {
  padding: 3rem 0;
  border-bottom: 1px solid rgba(141, 153, 174, 0.15);
}
.page-about .section:last-of-type {
  border-bottom: none;
}
.page-about .section-label {
  display: inline-block;
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 1rem;
  letter-spacing: 0.1em;
  color: var(--about-red);
  text-transform: uppercase;
  background: rgba(230, 57, 70, 0.08);
  padding: 0.2rem 0.8rem;
  border: 1px solid rgba(230, 57, 70, 0.25);
}
.page-about .section-label__deco {
  width: 30px;
  height: 2px;
  background: var(--about-red);
  margin-top: 0.5rem;
  opacity: 0.4;
}
.page-about .section-heading {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 2rem;
  line-height: 1.1;
  letter-spacing: 0.03em;
  color: var(--about-text);
  margin: 0 0 1.25rem;
  text-transform: uppercase;
}

/* ===== 我们的故事 ===== */
.page-about .about-story__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .about-story__left {
  flex: 0 0 auto;
}
.page-about .about-story__right {
  flex: 1 1 auto;
}
.page-about .about-story__text {
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 0.95rem;
  line-height: 1.7;
  color: var(--about-text);
  margin: 0 0 1rem;
  max-width: 660px;
}
.page-about .about-story__text:last-of-type {
  margin-bottom: 1.25rem;
}
.page-about .about-story__media {
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  margin-top: 0.5rem;
}
.page-about .about-story__chart {
  width: 100%;
  max-width: 300px;
  height: auto;
  border: var(--about-border-thick);
  box-shadow: var(--about-accent-shadow);
  object-fit: cover;
  background: var(--about-bg);
}
.page-about .about-story__media-caption {
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 0.8rem;
  color: var(--about-gray);
  letter-spacing: 0.02em;
  border-left: 2px solid var(--about-red);
  padding-left: 0.6rem;
}

/* ===== 时间线 ===== */
.page-about .about-timeline__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .about-timeline__left {
  flex: 0 0 auto;
}
.page-about .about-timeline__right {
  flex: 1 1 auto;
}
.page-about .timeline {
  position: relative;
  padding-left: 1.5rem;
}
.page-about .timeline::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0.4rem;
  bottom: 0.4rem;
  width: 3px;
  background: linear-gradient(to bottom, var(--about-red), var(--about-orange), var(--about-green), var(--about-blue));
  border-radius: 2px;
  opacity: 0.5;
}
.page-about .timeline__item {
  position: relative;
  margin-bottom: 1rem;
  border: 1px solid rgba(141, 153, 174, 0.2);
  background: rgba(29, 53, 87, 0.15);
  transition: background var(--about-transition), border-color var(--about-transition);
}
.page-about .timeline__item:hover,
.page-about .timeline__item:focus-within {
  background: rgba(29, 53, 87, 0.3);
  border-color: var(--about-red);
}
.page-about .timeline__node {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: 0.85rem 1rem;
  cursor: pointer;
  list-style: none;
  user-select: none;
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  transition: background var(--about-transition);
}
.page-about .timeline__node::-webkit-details-marker {
  display: none;
}
.page-about .timeline__node::marker {
  display: none;
  content: '';
}
.page-about .timeline__icon {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 2rem;
  height: 2rem;
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 1rem;
  color: var(--about-text);
  background: var(--about-red);
  border: 2px solid var(--about-red);
  box-shadow: 3px 3px 0 rgba(230, 57, 70, 0.3);
  line-height: 1;
}
.page-about .timeline__icon--1 { background: var(--about-red); border-color: var(--about-red); }
.page-about .timeline__icon--2 { background: var(--about-orange); border-color: var(--about-orange); color: var(--about-bg); }
.page-about .timeline__icon--3 { background: var(--about-green); border-color: var(--about-green); }
.page-about .timeline__icon--4 { background: var(--about-blue); border-color: var(--about-blue); }
.page-about .timeline__label {
  flex: 1 1 auto;
  font-weight: 600;
  font-size: 0.95rem;
  color: var(--about-text);
  letter-spacing: 0.02em;
}
.page-about .timeline__expand {
  flex-shrink: 0;
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--about-red);
  transition: transform var(--about-transition);
  line-height: 1;
}
.page-about .timeline__item[open] .timeline__expand {
  transform: rotate(45deg);
}
.page-about .timeline__detail {
  padding: 0 1rem 1rem 3.5rem;
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 0.88rem;
  line-height: 1.65;
  color: var(--about-gray);
  border-top: 1px solid rgba(141, 153, 174, 0.15);
  animation: aboutFadeIn 0.3s ease;
}
.page-about .timeline__detail p {
  margin: 0.6rem 0;
}
@keyframes aboutFadeIn {
  from { opacity: 0; transform: translateY(-4px); }
  to { opacity: 1; transform: translateY(0); }
}

/* ===== 服务数据 ===== */
.page-about .about-data__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .about-data__left {
  flex: 0 0 auto;
}
.page-about .about-data__right {
  flex: 1 1 auto;
}
.page-about .data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
}
.page-about .data-card {
  background: rgba(29, 53, 87, 0.2);
  border: 2px solid rgba(141, 153, 174, 0.2);
  padding: 1.25rem 1.25rem 1rem;
  box-shadow: var(--about-card-shadow);
  transition: transform var(--about-transition), border-color var(--about-transition), box-shadow var(--about-transition);
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}
.page-about .data-card:hover {
  transform: translateY(-3px);
  border-color: var(--about-red);
  box-shadow: 8px 8px 0 rgba(230, 57, 70, 0.25);
}
.page-about .data-card__icon {
  font-size: 1.4rem;
  line-height: 1;
  margin-bottom: 0.2rem;
}
.page-about .data-card__value {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 2.4rem;
  line-height: 1;
  color: var(--about-text);
  letter-spacing: 0.04em;
}
.page-about .data-card__unit {
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 0.85rem;
  color: var(--about-gray);
  margin-left: 0.15rem;
}
.page-about .data-card__label {
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 0.85rem;
  color: var(--about-gray);
  letter-spacing: 0.02em;
  margin-top: 0.1rem;
}
.page-about .data-card__bar {
  width: 100%;
  height: 4px;
  background: rgba(141, 153, 174, 0.2);
  border-radius: 2px;
  margin-top: 0.5rem;
  overflow: hidden;
}
.page-about .data-card__bar-fill {
  display: block;
  height: 100%;
  background: linear-gradient(90deg, var(--about-red), var(--about-orange));
  border-radius: 2px;
  transition: width 0.6s ease;
}

/* ===== 品牌承诺 ===== */
.page-about .about-commitment__inner {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
}
.page-about .about-commitment__left {
  flex: 0 0 auto;
}
.page-about .about-commitment__right {
  flex: 1 1 auto;
}
.page-about .commitment-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 1.5rem;
}
.page-about .commitment-item {
  background: rgba(29, 53, 87, 0.15);
  border: 2px solid rgba(141, 153, 174, 0.18);
  padding: 1.25rem;
  box-shadow: var(--about-card-shadow);
  transition: transform var(--about-transition), border-color var(--about-transition), box-shadow var(--about-transition);
}
.page-about .commitment-item:hover {
  transform: translateY(-2px);
  border-color: var(--about-orange);
  box-shadow: 6px 6px 0 rgba(244, 162, 97, 0.25);
}
.page-about .commitment-item__icon {
  font-size: 1.6rem;
  line-height: 1;
  display: block;
  margin-bottom: 0.5rem;
}
.page-about .commitment-item__title {
  font-family: var(--font-heading, 'Bebas Neue', Impact, sans-serif);
  font-size: 1.3rem;
  letter-spacing: 0.06em;
  color: var(--about-text);
  margin: 0 0 0.35rem;
  text-transform: uppercase;
}
.page-about .commitment-item__text {
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 0.88rem;
  line-height: 1.6;
  color: var(--about-gray);
  margin: 0;
}
.page-about .commitment__media {
  margin-top: 0.5rem;
}
.page-about .commitment__img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border: 3px solid var(--about-blue);
  box-shadow: 6px 6px 0 rgba(29, 53, 87, 0.4);
  object-fit: cover;
  background: var(--about-bg);
}

/* ===== CTA 区域 ===== */
.page-about .about-cta {
  background: rgba(230, 57, 70, 0.06);
  border-top: 1px solid rgba(230, 57, 70, 0.15);
  border-bottom: none !important;
  padding: 2.5rem 0;
}
.page-about .about-cta__inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  text-align: center;
}
.page-about .about-cta__text {
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-size: 0.95rem;
  color: var(--about-gray);
  max-width: 500px;
  margin: 0;
  line-height: 1.6;
}
.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.6rem 1.5rem;
  font-family: var(--font-body, Inter, system-ui, sans-serif);
  font-weight: 600;
  font-size: 0.9rem;
  letter-spacing: 0.03em;
  text-transform: uppercase;
  text-decoration: none;
  color: var(--about-text);
  background: var(--about-red);
  border: 2px solid var(--about-red);
  box-shadow: 4px 4px 0 rgba(230, 57, 70, 0.3);
  transition: background var(--about-transition), border-color var(--about-transition), transform var(--about-transition), box-shadow var(--about-transition);
  cursor: pointer;
  line-height: 1.2;
}
.page-about .btn:hover,
.page-about .btn:focus-visible {
  background: var(--about-orange);
  border-color: var(--about-orange);
  color: var(--about-bg);
  box-shadow: 4px 4px 0 rgba(244, 162, 97, 0.3);
  transform: translate(-1px, -1px);
}
.page-about .btn--outline {
  background: transparent;
  color: var(--about-text);
  border-color: var(--about-gray);
  box-shadow: none;
}
.page-about .btn--outline:hover,
.page-about .btn--outline:focus-visible {
  background: transparent;
  border-color: var(--about-red);
  color: var(--about-red);
  box-shadow: none;
  transform: translate(-1px, -1px);
}

/* ===== 响应式（桌面端 768px+） ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    min-height: 400px;
  }
  .page-about .about-hero__inner {
    flex-direction: row;
    align-items: flex-end;
    gap: 2rem;
    padding-top: 3rem;
    padding-bottom: 3rem;
  }
  .page-about .about-hero__left {
    flex: 0 0 30%;
  }
  .page-about .about-hero__tagline {
    font-size: 1.6rem;
  }
  .page-about .about-hero__title {
    font-size: 4.5rem;
  }
  .page-about .about-hero__sub {
    font-size: 1.1rem;
  }

  .page-about .section {
    padding: 4rem 0;
  }
  .page-about .section-heading {
    font-size: 2.6rem;
  }

  .page-about .about-story__inner,
  .page-about .about-timeline__inner,
  .page-about .about-data__inner,
  .page-about .about-commitment__inner {
    flex-direction: row;
    gap: 2.5rem;
  }
  .page-about .about-story__left,
  .page-about .about-timeline__left,
  .page-about .about-data__left,
  .page-about .about-commitment__left {
    flex: 0 0 28%;
    max-width: 220px;
  }
  .page-about .about-story__right,
  .page-about .about-timeline__right,
  .page-about .about-data__right,
  .page-about .about-commitment__right {
    flex: 1 1 auto;
  }

  .page-about .data-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.25rem;
  }
  .page-about .data-card__value {
    font-size: 2.8rem;
  }

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

  .page-about .timeline {
    padding-left: 2rem;
  }
  .page-about .timeline::before {
    left: 0.75rem;
  }
  .page-about .timeline__node {
    padding: 1rem 1.25rem;
  }
  .page-about .timeline__detail {
    padding-left: 4rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__title {
    font-size: 5.5rem;
  }
  .page-about .about-hero__tagline {
    font-size: 1.8rem;
  }
  .page-about .section-heading {
    font-size: 3rem;
  }
  .page-about .about-story__text {
    font-size: 1rem;
  }
  .page-about .data-card__value {
    font-size: 3.2rem;
  }
}

/* ===== 确保不溢出 ===== */
.page-about img {
  max-width: 100%;
  height: auto;
}
.page-about * {
  box-sizing: border-box;
}