.page-about {
  --about-hero-min-height: 70vh;
  --about-accent-line: var(--primary-red, #E63946);
  --about-divider-color: var(--primary-red, #E63946);
  position: relative;
  display: flex;
  flex-direction: column;
  width: 100%;
  max-width: var(--content-max-width, 1200px);
  margin: 0 auto;
  padding: 0 1rem 3rem;
  font-family: var(--font-body, "Inter", system-ui, sans-serif);
  color: var(--text-primary, #fff);
}

/* ---------- 面包屑 ---------- */
.about-breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 0 0.5rem;
  font-size: 0.875rem;
  color: var(--text-secondary, #B0BEC5);
}
.about-breadcrumb a {
  color: var(--text-secondary, #B0BEC5);
  text-decoration: none;
  transition: color 0.2s;
}
.about-breadcrumb a:hover,
.about-breadcrumb a:focus-visible {
  color: var(--link-hover, #F4A261);
}
.about-breadcrumb__sep {
  user-select: none;
}
.about-breadcrumb [aria-current="page"] {
  color: var(--accent-gold, #F4A261);
  font-weight: 600;
}

/* ---------- 进度指示器 ---------- */
.about-progress {
  display: none;
  position: fixed;
  right: 1.5rem;
  top: 50%;
  transform: translateY(-50%);
  flex-direction: column;
  align-items: center;
  gap: 1.25rem;
  z-index: 10;
  pointer-events: none;
}
.about-progress__dot {
  display: block;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--section-bg-alt, #233554);
  border: 2px solid var(--primary-red, #E63946);
  transition: background 0.3s, transform 0.3s;
}
.about-progress__dot[data-section="hero"] {
  background: var(--primary-red, #E63946);
  transform: scale(1.2);
}

/* ---------- HERO ---------- */
.about-hero {
  position: relative;
  min-height: var(--about-hero-min-height);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
  margin: 0 -1rem;
  border-radius: 0 0 4px 4px;
}
.about-hero__inner {
  position: relative;
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
}
.about-hero__img {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
}
.about-hero__overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(135deg, rgba(13,27,51,0.88) 0%, rgba(230,57,70,0.55) 100%);
  z-index: 1;
}
.about-hero__bg {
  position: absolute;
  inset: 0;
  z-index: 2;
  background: repeating-linear-gradient(
    -12deg,
    transparent,
    transparent 30px,
    rgba(244,162,97,0.06) 30px,
    rgba(244,162,97,0.06) 31px
  );
  pointer-events: none;
}
.about-hero__content {
  position: relative;
  z-index: 3;
  text-align: center;
  padding: 2rem 1.5rem;
}
.about-hero__title {
  font-family: var(--font-heading, "Oswald", "Impact", sans-serif);
  font-size: clamp(3rem, 12vw, 5.5rem);
  font-weight: 700;
  font-style: italic;
  line-height: 1;
  text-transform: uppercase;
  color: var(--text-primary, #fff);
  text-shadow: 0 4px 20px rgba(0,0,0,0.5);
  letter-spacing: 0.02em;
  margin: 0 0 0.75rem;
}
.about-hero__subtitle {
  font-size: clamp(1rem, 3vw, 1.5rem);
  font-weight: 400;
  color: var(--accent-gold, #F4A261);
  letter-spacing: 0.08em;
  margin: 0;
  text-shadow: 0 2px 12px rgba(0,0,0,0.4);
}

/* ---------- 章节分割线 ---------- */
.section-divider {
  width: 100%;
  height: 2px;
  margin: 2.5rem 0;
  background: linear-gradient(90deg, transparent 0%, var(--about-divider-color) 20%, var(--about-divider-color) 80%, transparent 100%);
  opacity: 0.5;
}

/* ---------- 通用章节标题 ---------- */
.section-heading {
  font-family: var(--font-heading, "Oswald", "Impact", sans-serif);
  font-size: clamp(1.75rem, 5vw, 2.5rem);
  font-weight: 700;
  font-style: italic;
  line-height: 1.15;
  color: var(--primary-red, #E63946);
  margin: 0 0 1rem;
  position: relative;
  padding-bottom: 0.5rem;
}
.section-heading::after {
  content: "";
  display: block;
  width: 60px;
  height: 3px;
  background: var(--accent-gold, #F4A261);
  margin-top: 0.25rem;
}

/* ---------- 品牌简介 ---------- */
.about-intro {
  padding: 0.5rem 0;
}
.about-intro__inner {
  max-width: 820px;
}
.about-intro__lead {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--accent-gold, #F4A261);
  margin: 0 0 1.25rem;
  line-height: 1.5;
}
.about-intro__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}
.about-intro__text p {
  margin: 0 0 1rem;
  line-height: 1.7;
  color: var(--text-secondary, #B0BEC5);
}
.about-intro__text .btn {
  display: inline-block;
  margin-top: 0.75rem;
  padding: 0.7rem 1.8rem;
  background: var(--primary-red, #E63946);
  color: var(--text-primary, #fff);
  font-family: var(--font-body, "Inter", system-ui, sans-serif);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: none;
  border-radius: 2px;
  transition: background 0.25s, transform 0.2s;
  cursor: pointer;
}
.about-intro__text .btn:hover,
.about-intro__text .btn:focus-visible {
  background: var(--button-hover-bg, #C1272D);
  transform: translateY(-2px);
}
.about-intro__stat {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: 1.5rem;
  background: var(--section-bg-light, #1A2A4A);
  border-left: 4px solid var(--primary-red, #E63946);
  border-radius: 2px;
}
.about-intro__stat-num {
  font-family: var(--font-heading, "Oswald", "Impact", sans-serif);
  font-size: 2.8rem;
  font-weight: 700;
  color: var(--primary-red, #E63946);
  line-height: 1;
}
.about-intro__stat-label {
  font-size: 0.9rem;
  color: var(--text-secondary, #B0BEC5);
  margin-top: 0.25rem;
  letter-spacing: 0.05em;
}

/* ---------- 核心服务 ---------- */
.about-services {
  padding: 0.5rem 0;
}
.about-services__inner {
  max-width: 820px;
}
.about-services__intro {
  font-size: 1rem;
  color: var(--text-secondary, #B0BEC5);
  margin: 0 0 1.75rem;
  line-height: 1.6;
}
.services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1rem;
  margin-bottom: 2rem;
}
.service-item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.25rem 1rem;
  background: var(--section-bg-light, #1A2A4A);
  border-radius: 2px;
  transition: background 0.25s, transform 0.2s;
}
.service-item:hover {
  background: var(--section-bg-alt, #233554);
  transform: translateX(4px);
}
.service-item__num {
  font-family: var(--font-heading, "Oswald", "Impact", sans-serif);
  font-size: 1.8rem;
  font-weight: 700;
  font-style: italic;
  color: var(--accent-gold, #F4A261);
  line-height: 1;
  min-width: 2.2rem;
  flex-shrink: 0;
}
.service-item__content {
  flex: 1;
}
.service-item__title {
  font-family: var(--font-heading, "Oswald", "Impact", sans-serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--text-primary, #fff);
  margin: 0 0 0.2rem;
  line-height: 1.2;
}
.service-item__desc {
  font-size: 0.9rem;
  color: var(--text-secondary, #B0BEC5);
  margin: 0;
  line-height: 1.5;
}
.about-services__img {
  width: 100%;
  max-width: 600px;
  height: auto;
  border-radius: 2px;
  display: block;
  margin: 1.5rem auto 0;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

/* ---------- 联系信息 ---------- */
.about-contact {
  padding: 0.5rem 0;
}
.about-contact__inner {
  max-width: 820px;
}
.about-contact__lead {
  font-size: 1rem;
  color: var(--text-secondary, #B0BEC5);
  margin: 0 0 1.75rem;
  line-height: 1.6;
}
.contact-details {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.75rem;
  margin-bottom: 2rem;
}
.contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.5rem 1rem;
  padding: 0.9rem 1rem;
  background: var(--section-bg-light, #1A2A4A);
  border-radius: 2px;
  border-left: 3px solid var(--primary-red, #E63946);
}
.contact-item__label {
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--accent-gold, #F4A261);
  min-width: 5.5rem;
  text-transform: uppercase;
  letter-spacing: 0.04em;
}
.contact-item__value {
  font-size: 0.95rem;
  color: var(--text-primary, #fff);
  word-break: break-all;
  flex: 1;
}
.contact-item__copy {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.3rem 0.8rem;
  font-size: 0.78rem;
  font-weight: 600;
  font-family: var(--font-body, "Inter", system-ui, sans-serif);
  color: var(--primary-black, #1D3557);
  background: var(--accent-gold, #F4A261);
  border: none;
  border-radius: 2px;
  cursor: pointer;
  transition: background 0.2s, transform 0.15s;
}
.contact-item__copy:hover,
.contact-item__copy:focus-visible {
  background: var(--primary-red, #E63946);
  color: var(--text-primary, #fff);
  transform: scale(1.04);
}
.about-contact__img {
  width: 100%;
  max-width: 800px;
  height: auto;
  border-radius: 2px;
  display: block;
  margin: 1.5rem auto 0;
  box-shadow: 0 4px 20px rgba(0,0,0,0.3);
}

/* ---------- 响应式：平板及以上 ---------- */
@media (min-width: 640px) {
  .page-about {
    padding: 0 2rem 4rem;
  }

  .about-hero {
    margin: 0 -2rem;
    min-height: 60vh;
    border-radius: 0 0 6px 6px;
  }
  .about-hero__title {
    font-size: clamp(4rem, 10vw, 6rem);
  }

  .about-progress {
    display: flex;
  }

  .section-divider {
    margin: 3.5rem 0;
  }

  .about-intro__grid {
    grid-template-columns: 2fr 1fr;
    align-items: start;
  }

  .services-grid {
    grid-template-columns: 1fr 1fr;
  }

  .contact-details {
    grid-template-columns: 1fr 1fr;
  }
  .contact-item:last-child {
    grid-column: 1 / -1;
  }
}

/* ---------- 响应式：桌面 ---------- */
@media (min-width: 1024px) {
  .page-about {
    padding: 0 3rem 5rem;
  }

  .about-hero {
    margin: 0 -3rem;
    min-height: 55vh;
  }
  .about-hero__title {
    font-size: 6.5rem;
  }

  .about-progress {
    right: 0.5rem;
    gap: 1.5rem;
  }
  .about-progress__dot {
    width: 12px;
    height: 12px;
  }

  .section-divider {
    margin: 4rem 0;
  }

  .section-heading {
    font-size: 2.8rem;
  }

  .about-intro__inner,
  .about-services__inner,
  .about-contact__inner {
    max-width: 860px;
  }

  .services-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.25rem;
  }

  .contact-details {
    grid-template-columns: 1fr 1fr;
  }
}

/* ---------- 动效：滚动显现（渐进增强） ---------- */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  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 [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }
  .page-about .service-item:hover {
    transform: none;
  }
  .page-about .about-intro__text .btn:hover {
    transform: none;
  }
  .page-about .contact-item__copy:hover {
    transform: none;
  }
}