.page-about {
  --about-red: #E63946;
  --about-red-dark: #B71C1C;
  --about-black: #1D3557;
  --about-gold: #F4A261;
  --about-white: #FFFFFF;
  --about-gray-light: #E2E8F0;
  --about-gray-dark: #334155;
  --about-font-heading: 'Inter', sans-serif;
  --about-font-body: system-ui, sans-serif;
  --about-font-data: 'JetBrains Mono', monospace;
  --about-header-height: 70px;
  --about-container-max: 1280px;
  --about-transition: 0.25s ease;
  --about-border-width: 3px;
  --about-shadow: 0 8px 24px rgba(0,0,0,0.4);
  --about-gold-glow: 0 0 12px rgba(244,162,97,0.3);
  --about-speedline-color: rgba(230,57,70,0.15);
  --about-card-bg: #1a2744;
  --about-mission-overlay: rgba(29,53,87,0.65);

  background-color: var(--about-black);
  color: var(--about-white);
  font-family: var(--about-font-body);
  line-height: 1.6;
  overflow-x: hidden;
}

/* ---------- container ---------- */
.page-about .container {
  width: 100%;
  max-width: var(--about-container-max);
  margin: 0 auto;
  padding: 0 1.25rem;
}

.page-about .container--narrow {
  max-width: 960px;
}

/* ---------- section ---------- */
.page-about .section {
  padding: 3.5rem 0;
  position: relative;
}

/* ---------- section-title ---------- */
.page-about .section-title {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-style: italic;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  font-size: 2.2rem;
  margin: 0 0 1rem 0;
  line-height: 1.15;
  display: flex;
  align-items: center;
  gap: 0.5rem;
  color: var(--about-white);
}

.page-about .section-title--center {
  justify-content: center;
}

.page-about .section-title--light {
  color: var(--about-white);
}

.page-about .section-title__decor {
  color: var(--about-gold);
  font-size: 1.8rem;
  font-weight: 700;
  line-height: 1;
}

/* ---------- breadcrumb ---------- */
.page-about .breadcrumb-wrap {
  padding: 0.75rem 0 0 0;
}

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  list-style: none;
  margin: 0;
  padding: 0;
  gap: 0.5rem;
  font-size: 0.85rem;
  color: var(--about-gray-light);
}

.page-about .breadcrumb__item {
  display: flex;
  align-items: center;
  gap: 0.5rem;
}

.page-about .breadcrumb__item::before {
  content: '→';
  color: var(--about-gold);
  font-size: 0.75rem;
}

.page-about .breadcrumb__item:first-child::before {
  content: none;
}

.page-about .breadcrumb__item a {
  color: var(--about-gold);
  text-decoration: none;
  transition: opacity var(--about-transition);
}

.page-about .breadcrumb__item a:hover,
.page-about .breadcrumb__item a:focus-visible {
  opacity: 0.75;
  outline: 2px solid var(--about-gold);
  outline-offset: 2px;
}

.page-about .breadcrumb__item--current {
  color: var(--about-white);
  font-weight: 600;
}

/* ---------- hero statement ---------- */
.page-about .section--hero-statement {
  padding: 4rem 0 2.5rem 0;
  position: relative;
  overflow: hidden;
}

.page-about .hero-statement__inner {
  position: relative;
  z-index: 2;
  text-align: center;
  padding: 2rem 0;
}

.page-about .hero-statement__label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-weight: 700;
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--about-gold);
  border: var(--about-border-width) solid var(--about-gold);
  padding: 0.25rem 1rem;
  margin-bottom: 1.5rem;
}

.page-about .hero-statement__title {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-style: italic;
  text-transform: uppercase;
  font-size: clamp(2.5rem, 8vw, 5rem);
  letter-spacing: 0.02em;
  line-height: 1.1;
  margin: 0 0 0.75rem 0;
  color: var(--about-white);
}

.page-about .hero-statement__sub {
  font-size: 1.15rem;
  color: var(--about-gold);
  font-weight: 500;
  letter-spacing: 0.06em;
  margin: 0 0 1.5rem 0;
}

.page-about .hero-statement__meta {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1rem;
  margin-bottom: 2rem;
}

.page-about .hero-statement__meta-line {
  font-family: var(--about-font-data);
  font-size: 0.85rem;
  color: var(--about-gray-light);
  padding: 0.25rem 0.75rem;
  border-left: 2px solid var(--about-red);
}

.page-about .hero-statement__meta-line:first-child {
  border-left: none;
}

.page-about .hero-statement__speedline {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: repeating-linear-gradient(
    -45deg,
    transparent,
    transparent 20px,
    var(--about-speedline-color) 20px,
    var(--about-speedline-color) 21px
  );
  z-index: 1;
  pointer-events: none;
  opacity: 0.3;
}

/* ---------- brand story ---------- */
.page-about .section--story {
  padding: 2.5rem 0 3.5rem 0;
}

.page-about .story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.page-about .story-grid__text {
  order: 2;
}

.page-about .story-grid__visual {
  order: 1;
  position: relative;
}

.page-about .story-grid__lead {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--about-gold);
  margin: 0 0 1rem 0;
  line-height: 1.4;
}

.page-about .story-grid__body {
  font-size: 1rem;
  color: var(--about-gray-light);
  margin: 0 0 1rem 0;
  max-width: 620px;
}

.page-about .story-grid__sig {
  margin-top: 1.5rem;
  border-top: 2px solid var(--about-red);
  padding-top: 0.75rem;
}

.page-about .story-grid__sig-line {
  font-family: var(--about-font-heading);
  font-style: italic;
  color: var(--about-gold);
  font-size: 0.95rem;
}

.page-about .story-grid__img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: var(--about-border-width) solid var(--about-red);
  box-shadow: var(--about-shadow);
  display: block;
}

.page-about .story-grid__visual-accent {
  position: absolute;
  bottom: -12px;
  right: -12px;
  width: 80px;
  height: 80px;
  border: var(--about-border-width) solid var(--about-gold);
  z-index: -1;
  opacity: 0.5;
}

/* ---------- services ---------- */
.page-about .section--services {
  padding: 3rem 0;
  border-top: 2px solid rgba(244,162,97,0.15);
  border-bottom: 2px solid rgba(244,162,97,0.15);
}

.page-about .services-header {
  text-align: center;
  margin-bottom: 2.5rem;
}

.page-about .services-header__desc {
  font-size: 1.05rem;
  color: var(--about-gray-light);
  max-width: 480px;
  margin: 0 auto;
}

.page-about .services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .service-card {
  perspective: 800px;
  height: 220px;
  cursor: pointer;
}

.page-about .service-card__inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s ease;
  transform-style: preserve-3d;
}

.page-about .service-card:hover .service-card__inner,
.page-about .service-card:focus-within .service-card__inner {
  transform: rotateY(180deg);
}

.page-about .service-card__face {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  backface-visibility: hidden;
  background-color: var(--about-card-bg);
  border: var(--about-border-width) solid rgba(230,57,70,0.3);
  box-shadow: var(--about-shadow);
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
}

.page-about .service-card__face--front {
  z-index: 2;
}

.page-about .service-card__face--back {
  transform: rotateY(180deg);
  background-color: #0f1a30;
  border-color: var(--about-gold);
}

.page-about .service-card__icon {
  margin-bottom: 0.75rem;
}

.page-about .service-card__title {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: 1.25rem;
  text-transform: uppercase;
  letter-spacing: 0.02em;
  margin: 0 0 0.5rem 0;
  color: var(--about-white);
}

.page-about .service-card__brief {
  font-size: 0.9rem;
  color: var(--about-gray-light);
  margin: 0;
  line-height: 1.5;
}

.page-about .service-card__detail {
  font-size: 0.92rem;
  color: var(--about-gray-light);
  line-height: 1.6;
  margin: 0;
}

.page-about .services-cta {
  text-align: center;
  margin-top: 2rem;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
}

.page-about .services-cta__text {
  font-size: 0.85rem;
  color: var(--about-gray-light);
  margin: 0;
}

.page-about .btn {
  display: inline-block;
  background-color: var(--about-red);
  color: var(--about-white);
  font-family: var(--about-font-heading);
  font-weight: 700;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.06em;
  padding: 0.7rem 2rem;
  border: none;
  box-shadow: var(--about-shadow);
  text-decoration: none;
  transition: background-color var(--about-transition), box-shadow var(--about-transition);
  cursor: pointer;
}

.page-about .btn:hover,
.page-about .btn:focus-visible {
  background-color: var(--about-red-dark);
  box-shadow: var(--about-gold-glow);
  outline: none;
}

.page-about .btn--outline {
  background-color: transparent;
  border: 2px solid var(--about-gold);
  color: var(--about-gold);
}

.page-about .btn--outline:hover,
.page-about .btn--outline:focus-visible {
  background-color: var(--about-gold);
  color: var(--about-black);
  box-shadow: var(--about-gold-glow);
}

/* ---------- yunnan gene ---------- */
.page-about .section--yunnan {
  padding: 3.5rem 0;
}

.page-about .yn-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}

.page-about .yn-grid__lead {
  font-size: 1.15rem;
  color: var(--about-gold);
  font-weight: 500;
  margin: 0 0 1.5rem 0;
}

.page-about .yn-grid__list {
  list-style: none;
  margin: 0 0 2rem 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}

.page-about .yn-grid__item {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
}

.page-about .yn-grid__item-num {
  font-family: var(--about-font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: 1.1rem;
  color: var(--about-red);
  min-width: 2rem;
}

.page-about .yn-grid__item-text {
  font-size: 0.95rem;
  color: var(--about-gray-light);
  line-height: 1.5;
}

.page-about .yn-grid__data {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  border-left: 4px solid var(--about-gold);
  padding-left: 1rem;
}

.page-about .yn-grid__data .data-value {
  font-family: var(--about-font-data);
  font-weight: 600;
  font-size: 2rem;
  color: var(--about-gold);
  line-height: 1;
}

.page-about .yn-grid__data-label {
  font-size: 0.9rem;
  color: var(--about-gray-light);
}

.page-about .yn-grid__visual {
  position: relative;
}

.page-about .yn-grid__img {
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border: var(--about-border-width) solid rgba(244,162,97,0.4);
  box-shadow: var(--about-shadow);
  display: block;
}

.page-about .yn-grid__visual-bar {
  position: absolute;
  top: -8px;
  left: -8px;
  width: 40px;
  height: 40px;
  border-top: var(--about-border-width) solid var(--about-red);
  border-left: var(--about-border-width) solid var(--about-red);
  z-index: 1;
  opacity: 0.6;
}

/* ---------- mission ---------- */
.page-about .section--mission {
  padding: 3rem 0 4rem 0;
}

.page-about .mission-block {
  position: relative;
  overflow: hidden;
  min-height: 340px;
}

.page-about .mission-block__bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: 0;
}

.page-about .mission-block__bg-img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  display: block;
}

.page-about .mission-block__bg-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: linear-gradient(135deg, var(--about-mission-overlay) 40%, rgba(230,57,70,0.3) 100%);
  z-index: 1;
}

.page-about .mission-block__content {
  position: relative;
  z-index: 2;
  padding: 2rem 1.5rem;
  max-width: 720px;
}

.page-about .mission-block__lead {
  font-size: 1.35rem;
  font-weight: 600;
  color: var(--about-gold);
  margin: 0 0 1rem 0;
  line-height: 1.4;
}

.page-about .mission-block__body {
  font-size: 1rem;
  color: var(--about-gray-light);
  margin: 0 0 0.85rem 0;
  max-width: 600px;
}

.page-about .mission-block__stats {
  display: flex;
  flex-wrap: wrap;
  gap: 1.5rem 2.5rem;
  margin: 1.5rem 0 1.8rem 0;
}

.page-about .mission-stat {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
}

.page-about .mission-stat .data-value {
  font-family: var(--about-font-data);
  font-weight: 600;
  font-size: 1.15rem;
  color: var(--about-gold);
}

.page-about .mission-stat__label {
  font-size: 0.78rem;
  color: var(--about-gray-light);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* ---------- trust ---------- */
.page-about .section--trust {
  padding: 1.5rem 0 2.5rem 0;
  border-top: 1px solid rgba(226,232,240,0.1);
}

.page-about .trust-block {
  text-align: center;
}

.page-about .trust-block__text {
  font-size: 0.8rem;
  color: var(--about-gray-light);
  opacity: 0.7;
  margin: 0;
  max-width: 640px;
  margin: 0 auto;
}

/* ============================================= */
/*  响应式 - 桌面 768px+                       */
/* ============================================= */
@media (min-width: 768px) {
  .page-about .section {
    padding: 4.5rem 0;
  }

  .page-about .section--hero-statement {
    padding: 5rem 0 3rem 0;
  }

  .page-about .hero-statement__title {
    font-size: clamp(3.5rem, 6vw, 5.5rem);
  }

  .page-about .hero-statement__meta {
    gap: 1.5rem;
  }

  .page-about .story-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about .story-grid__text {
    order: 1;
  }

  .page-about .story-grid__visual {
    order: 2;
  }

  .page-about .services-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.75rem;
  }

  .page-about .service-card {
    height: 240px;
  }

  .page-about .yn-grid {
    grid-template-columns: 1fr 1fr;
    gap: 3rem;
  }

  .page-about .mission-block__content {
    padding: 3rem 2.5rem;
  }

  .page-about .section--trust {
    padding: 2rem 0 3rem 0;
  }
}

/* ============================================= */
/*  响应式 - 大桌面 1024px+                    */
/* ============================================= */
@media (min-width: 1024px) {
  .page-about .container {
    padding: 0 2rem;
  }

  .page-about .section {
    padding: 5.5rem 0;
  }

  .page-about .section--hero-statement {
    padding: 6rem 0 3.5rem 0;
  }

  .page-about .hero-statement__title {
    font-size: 5rem;
  }

  .page-about .services-grid {
    grid-template-columns: repeat(4, 1fr);
    gap: 1.5rem;
  }

  .page-about .service-card {
    height: 260px;
  }

  .page-about .story-grid__lead {
    font-size: 1.5rem;
  }

  .page-about .mission-block__stats {
    gap: 2rem 3.5rem;
  }
}

/* ============================================= */
/*  焦点可见性 & 交互增强                       */
/* ============================================= */
.page-about *:focus-visible {
  outline: 2px solid var(--about-gold);
  outline-offset: 3px;
}

/* 数据属性交互：卡片翻转由 JS 增强，无 JS 时 hover 仍可工作 */
.page-about [data-hover="flip"] {
  cursor: pointer;
}

/* 服务卡片键盘可访问 */
.page-about .service-card:focus-within .service-card__inner {
  transform: rotateY(180deg);
}

/* 链接站内路由颜色 */
.page-about a[href^="/"] {
  color: var(--about-gold);
  text-decoration: none;
  transition: opacity var(--about-transition);
}

.page-about a[href^="/"]:hover {
  opacity: 0.8;
}

/* 图片响应式约束 */
.page-about img {
  max-width: 100%;
  height: auto;
}