.page-about {
  --color-primary-dark: #0B1A2E;
  --color-gold: #D4AF37;
  --color-accent-red: #E63946;
  --color-electric-blue: #00B4D8;
  --color-dark-gray: #2C3E50;
  --color-light-gray: #EAECEE;
  --color-text-white: #FFFFFF;
  --color-text-dark: #1A1A1A;
  --font-heading: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-body: 'Inter', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  --font-mono: 'JetBrains Mono', 'Courier New', monospace;
  --radius-lg: 24px;
  --radius-md: 16px;
  --radius-sm: 8px;
  --radius-pill: 9999px;
  --shadow-card: 0 4px 20px rgba(0,0,0,0.3);
  --shadow-hover: 0 8px 32px rgba(0,0,0,0.5);
  --transition: 0.3s cubic-bezier(0.4,0,0.2,1);
  --container-max: 1280px;
  --gap: 2rem;

  display: block;
  background-color: var(--color-primary-dark);
  color: var(--color-text-white);
  font-family: var(--font-body);
  line-height: 1.7;
  letter-spacing: 0.02em;
}

/* ===== 容器 ===== */
.page-about .container {
  max-width: var(--container-max);
  margin-left: auto;
  margin-right: auto;
  padding-left: 1.25rem;
  padding-right: 1.25rem;
}

/* ===== 通用标题与描述 ===== */
.page-about .section-heading {
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(2rem, 5vw, 3.5rem);
  color: var(--color-gold);
  margin: 0 0 0.5rem;
  letter-spacing: 0.02em;
  position: relative;
  display: inline-block;
}
.page-about .section-heading::after {
  content: '';
  display: block;
  width: 60%;
  height: 4px;
  background: var(--color-gold);
  margin-top: 0.5rem;
  border-radius: 2px;
}
.page-about .section-heading--light {
  color: var(--color-text-white);
}
.page-about .section-heading--light::after {
  background: var(--color-gold);
}
.page-about .section-desc {
  font-size: 1.05rem;
  color: var(--color-light-gray);
  max-width: 680px;
  margin: 0 0 2rem;
}
.page-about .section-desc--light {
  color: rgba(255,255,255,0.75);
}

/* ===== 标签 ===== */
.page-about .tag {
  display: inline-block;
  padding: 0.25rem 0.85rem;
  font-size: 0.75rem;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.08em;
  border-radius: var(--radius-pill);
  background: rgba(255,255,255,0.08);
  color: var(--color-light-gray);
  border: 1px solid rgba(255,255,255,0.12);
}
.page-about .tag--gold {
  background: rgba(212,175,55,0.15);
  color: var(--color-gold);
  border-color: rgba(212,175,55,0.3);
}

/* ===== 按钮 ===== */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.65rem 1.8rem;
  font-family: var(--font-body);
  font-weight: 600;
  font-size: 0.95rem;
  letter-spacing: 0.04em;
  border-radius: var(--radius-pill);
  text-decoration: none;
  transition: var(--transition);
  border: 2px solid transparent;
  cursor: pointer;
}
.page-about .btn-primary {
  background: var(--color-gold);
  color: var(--color-primary-dark);
  border-color: var(--color-gold);
}
.page-about .btn-primary:hover,
.page-about .btn-primary:focus-visible {
  background: transparent;
  color: var(--color-gold);
  box-shadow: 0 0 0 2px var(--color-gold);
}
.page-about .btn-secondary {
  background: transparent;
  color: var(--color-gold);
  border-color: var(--color-gold);
}
.page-about .btn-secondary:hover,
.page-about .btn-secondary:focus-visible {
  background: var(--color-gold);
  color: var(--color-primary-dark);
}

/* ===== 卡片通用 ===== */
.page-about .card {
  background: var(--color-dark-gray);
  border-radius: var(--radius-lg);
  padding: 1.5rem;
  box-shadow: var(--shadow-card);
  transition: var(--transition);
}
.page-about .card:hover {
  box-shadow: var(--shadow-hover);
  transform: translateY(-4px);
}

/* ================================================
   第一块画板：品牌概览
   ================================================ */
.page-about .about-hero {
  position: relative;
  padding: 3rem 0 4rem;
  overflow: hidden;
}
.page-about .about-hero__inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}
.page-about .about-hero__text {
  flex: 1;
  order: 2;
}
.page-about .about-hero__label {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: 0.85rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-gold);
  margin: 0 0 0.5rem;
  opacity: 0.8;
}
.page-about .about-hero__title {
  font-family: var(--font-heading);
  font-weight: 800;
  font-style: italic;
  font-size: clamp(3rem, 8vw, 5.5rem);
  color: var(--color-gold);
  margin: 0 0 1rem;
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.page-about .about-hero__sub {
  font-size: 1.1rem;
  color: var(--color-light-gray);
  max-width: 580px;
  margin: 0 0 1.5rem;
  line-height: 1.8;
}
.page-about .about-hero__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}
.page-about .about-hero__visual {
  flex: 0 0 auto;
  order: 1;
  width: 100%;
  max-width: 360px;
}
.page-about .about-hero__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  object-fit: cover;
  aspect-ratio: 400/600;
}
.page-about .about-hero__divider {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 60px;
  background: var(--color-primary-dark);
  clip-path: polygon(0 100%, 100% 100%, 100% 0, 0 60%);
  z-index: 1;
}

/* ================================================
   第二块画板：产品与服务
   ================================================ */
.page-about .about-services {
  padding: 3rem 0 4rem;
  background: var(--color-dark-gray);
  position: relative;
}
.page-about .about-services::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 40px;
  background: var(--color-dark-gray);
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 40%);
}

/* 时间轴 */
.page-about .about-timeline {
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  margin: 2rem 0 2.5rem;
  padding: 1.5rem 0;
  position: relative;
}
.page-about .about-timeline__item {
  display: flex;
  flex-direction: column;
  align-items: center;
  flex: 0 0 auto;
  position: relative;
  cursor: default;
  transition: var(--transition);
}
.page-about .about-timeline__item:hover .about-timeline__dot,
.page-about .about-timeline__item:focus-visible .about-timeline__dot {
  transform: scale(1.4);
  box-shadow: 0 0 0 6px rgba(212,175,55,0.3);
}
.page-about .about-timeline__item:hover .about-timeline__desc,
.page-about .about-timeline__item:focus-visible .about-timeline__desc {
  opacity: 1;
  transform: translateY(0);
}
.page-about .about-timeline__dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--color-gold);
  border: 3px solid var(--color-primary-dark);
  box-shadow: 0 0 0 3px var(--color-gold);
  transition: var(--transition);
  flex-shrink: 0;
}
.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: 1.2rem;
  color: var(--color-gold);
  margin-top: 0.5rem;
  letter-spacing: 0.05em;
}
.page-about .about-timeline__desc {
  font-size: 0.8rem;
  color: var(--color-light-gray);
  text-align: center;
  margin-top: 0.25rem;
  opacity: 0.7;
  transition: var(--transition);
  transform: translateY(4px);
  max-width: 120px;
  line-height: 1.4;
}
.page-about .about-timeline__track {
  flex: 1;
  height: 4px;
  background: rgba(255,255,255,0.12);
  border-radius: 2px;
  position: relative;
  align-self: center;
  margin: 0 0.5rem;
}
.page-about .about-timeline__track-fill {
  display: block;
  height: 100%;
  width: 100%;
  background: linear-gradient(90deg, var(--color-gold), var(--color-electric-blue));
  border-radius: 2px;
  opacity: 0.6;
}

/* 服务网格 */
.page-about .about-services__grid {
  display: flex;
  flex-direction: column;
  gap: var(--gap);
  margin-top: 1.5rem;
}
.page-about .about-services__card {
  flex: 1;
}
.page-about .about-services__card-icon {
  font-size: 2rem;
  display: block;
  margin-bottom: 0.75rem;
  line-height: 1;
}
.page-about .about-services__card-title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.25rem;
  color: var(--color-gold);
  margin: 0 0 0.5rem;
}
.page-about .about-services__card-text {
  font-size: 0.95rem;
  color: var(--color-light-gray);
  margin: 0 0 1.25rem;
  line-height: 1.7;
}
.page-about .about-services__visual {
  width: 100%;
}
.page-about .about-services__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  object-fit: cover;
  aspect-ratio: 600/400;
}

/* ================================================
   第三块画板：数据承诺
   ================================================ */
.page-about .about-promise {
  padding: 3rem 0 4rem;
  background: var(--color-primary-dark);
  position: relative;
}
.page-about .about-promise::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 40px;
  background: var(--color-primary-dark);
  clip-path: polygon(0 40%, 100% 0, 100% 100%, 0 100%);
}
.page-about .about-promise__grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 2rem 0;
}
.page-about .about-promise__item {
  background: rgba(44,62,80,0.5);
  border-radius: var(--radius-md);
  padding: 1.5rem;
  border-left: 4px solid var(--color-gold);
  transition: var(--transition);
}
.page-about .about-promise__item:hover {
  background: rgba(44,62,80,0.8);
  transform: translateX(6px);
}
.page-about .about-promise__number {
  font-family: var(--font-mono);
  font-weight: 700;
  font-size: 1.8rem;
  color: var(--color-accent-red);
  opacity: 0.6;
  display: block;
  margin-bottom: 0.25rem;
  line-height: 1;
}
.page-about .about-promise__title {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.2rem;
  color: var(--color-gold);
  margin: 0 0 0.5rem;
}
.page-about .about-promise__text {
  font-size: 0.95rem;
  color: var(--color-light-gray);
  margin: 0;
  line-height: 1.7;
}
.page-about .about-promise__visual {
  margin: 2rem 0 1.5rem;
}
.page-about .about-promise__img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-card);
  object-fit: cover;
  aspect-ratio: 600/400;
}
.page-about .about-promise__cta {
  text-align: center;
  margin-top: 1.5rem;
}

/* ================================================
   第四块画板：联系方式
   ================================================ */
.page-about .about-contact {
  padding: 3rem 0 4rem;
  background: var(--color-dark-gray);
  position: relative;
}
.page-about .about-contact::before {
  content: '';
  position: absolute;
  top: -2px;
  left: 0;
  right: 0;
  height: 40px;
  background: var(--color-dark-gray);
  clip-path: polygon(0 0, 100% 0, 100% 40%, 0 100%);
}
.page-about .about-contact__grid {
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  margin: 2rem 0;
}

/* 翻转卡片 */
.page-about .about-contact__card {
  perspective: 800px;
  height: 160px;
  cursor: pointer;
}
.page-about .about-contact__card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.5s ease;
  transform-style: preserve-3d;
  border-radius: var(--radius-lg);
}
.page-about .about-contact__card:hover .about-contact__card-inner,
.page-about .about-contact__card:focus-visible .about-contact__card-inner {
  transform: rotateY(180deg);
}
.page-about .about-contact__card-front,
.page-about .about-contact__card-back {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-lg);
  backface-visibility: hidden;
  padding: 1.25rem;
  text-align: center;
  background: var(--color-primary-dark);
  border: 1px solid rgba(212,175,55,0.2);
  box-shadow: var(--shadow-card);
}
.page-about .about-contact__card-front {
  z-index: 2;
}
.page-about .about-contact__card-back {
  transform: rotateY(180deg);
  background: var(--color-primary-dark);
  border-color: var(--color-gold);
}
.page-about .about-contact__card-icon {
  font-size: 2.2rem;
  margin-bottom: 0.5rem;
  display: block;
  line-height: 1;
}
.page-about .about-contact__card-label {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1.1rem;
  color: var(--color-gold);
  letter-spacing: 0.06em;
  text-transform: uppercase;
}
.page-about .about-contact__card-value {
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: 0.95rem;
  color: var(--color-text-white);
  word-break: break-all;
  line-height: 1.5;
}
.page-about .about-contact__card-note {
  font-size: 0.75rem;
  color: var(--color-electric-blue);
  margin-top: 0.4rem;
  display: block;
}
.page-about .about-contact__note {
  font-size: 0.85rem;
  color: rgba(255,255,255,0.55);
  text-align: center;
  margin: 1.5rem auto 2rem;
  max-width: 600px;
  line-height: 1.6;
  border-top: 1px solid rgba(255,255,255,0.08);
  padding-top: 1.25rem;
}
.page-about .about-contact__footer {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 1rem;
  text-align: center;
}
.page-about .about-contact__icp {
  font-size: 0.75rem;
  color: rgba(255,255,255,0.4);
  font-family: var(--font-mono);
  letter-spacing: 0.04em;
}

/* ================================================
   响应式：平板 (min-width: 640px)
   ================================================ */
@media (min-width: 640px) {
  .page-about .container {
    padding-left: 2rem;
    padding-right: 2rem;
  }
  .page-about .about-hero__inner {
    flex-direction: row;
    align-items: center;
  }
  .page-about .about-hero__text {
    order: 1;
  }
  .page-about .about-hero__visual {
    order: 2;
    max-width: 320px;
  }
  .page-about .about-timeline {
    gap: 1.5rem;
    padding: 2rem 0.5rem;
  }
  .page-about .about-timeline__desc {
    font-size: 0.85rem;
  }
  .page-about .about-services__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
  }
  .page-about .about-services__visual {
    grid-column: 1 / -1;
  }
  .page-about .about-promise__grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  .page-about .about-contact__grid {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 1.25rem;
  }
  .page-about .about-contact__footer {
    flex-direction: row;
    justify-content: center;
    gap: 2rem;
  }
}

/* ================================================
   响应式：桌面 (min-width: 1024px)
   ================================================ */
@media (min-width: 1024px) {
  .page-about .container {
    padding-left: 3rem;
    padding-right: 3rem;
  }
  .page-about .about-hero {
    padding: 4rem 0 5rem;
  }
  .page-about .about-hero__inner {
    gap: 4rem;
  }
  .page-about .about-hero__visual {
    max-width: 400px;
  }
  .page-about .about-hero__sub {
    font-size: 1.2rem;
  }
  .page-about .about-services {
    padding: 4rem 0 5rem;
  }
  .page-about .about-services__grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
  .page-about .about-services__visual {
    grid-column: auto;
  }
  .page-about .about-timeline {
    gap: 2rem;
    padding: 2.5rem 1rem;
    margin: 2.5rem 0 3rem;
  }
  .page-about .about-timeline__dot {
    width: 28px;
    height: 28px;
  }
  .page-about .about-timeline__year {
    font-size: 1.4rem;
  }
  .page-about .about-promise {
    padding: 4rem 0 5rem;
  }
  .page-about .about-promise__grid {
    grid-template-columns: 1fr 1fr 1fr;
    gap: 2rem;
  }
  .page-about .about-promise__item {
    padding: 2rem;
  }
  .page-about .about-contact {
    padding: 4rem 0 5rem;
  }
  .page-about .about-contact__card {
    height: 180px;
  }
}