.page-about {
  --about-red: #DC2626;
  --about-gray: #2D2D2D;
  --about-gray-light: #4A4A4A;
  --about-gold: #C9A96E;
  --about-blue: #00A2FF;
  --about-white: #FFFFFF;
  --about-black: #0A0A0A;
  --about-font-title: Impact, 'Arial Black', sans-serif;
  --about-font-body: Helvetica, Arial, sans-serif;
  --about-transition: 0.3s ease;
  display: block;
  width: 100%;
  background-color: var(--about-gray);
  color: var(--about-white);
  font-family: var(--about-font-body);
  line-height: 1.5;
}

/* 面包屑 */
.page-about .breadcrumb {
  max-width: 1240px;
  margin: 0 auto;
  padding: 1rem 1.25rem 0;
  font-size: 0.8rem;
  color: var(--about-gold);
  display: flex;
  flex-wrap: wrap;
  gap: 0.375rem;
}
.page-about .breadcrumb a {
  color: var(--about-gold);
  text-decoration: none;
  transition: opacity var(--about-transition);
}
.page-about .breadcrumb a::after {
  content: "›";
  margin: 0 0.375rem;
  opacity: 0.6;
}
.page-about .breadcrumb a:hover {
  opacity: 0.7;
}
.page-about .breadcrumb span[aria-current] {
  color: var(--about-white);
  font-weight: 600;
}

/* 首屏品牌宣言 */
.page-about .about-hero {
  position: relative;
  padding: 3rem 1.25rem 2rem;
  text-align: center;
  background-color: var(--about-black);
  overflow: hidden;
}
.page-about .about-hero-inner {
  max-width: 1240px;
  margin: 0 auto;
  position: relative;
  z-index: 1;
}
.page-about .about-hero-title {
  font-family: var(--about-font-title);
  font-size: 3rem;
  font-weight: 900;
  color: var(--about-red);
  text-transform: uppercase;
  letter-spacing: 0.04em;
  margin: 0 0 0.25rem;
  line-height: 1.1;
}
.page-about .about-hero-subtitle {
  font-family: var(--about-font-title);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--about-white);
  margin: 0 0 0.75rem;
  letter-spacing: 0.02em;
}
.page-about .about-hero-desc {
  font-size: 1rem;
  color: var(--about-gray-light);
  max-width: 640px;
  margin: 0 auto 1.5rem;
  line-height: 1.6;
}
.page-about .about-hero-metric {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 1.25rem 2rem;
}
.page-about .about-hero-metric-item {
  font-size: 0.9rem;
  color: var(--about-white);
  background: rgba(220,38,38,0.18);
  padding: 0.4rem 1rem;
  border-left: 3px solid var(--about-red);
}
.page-about .about-hero-metric-num {
  font-weight: 900;
  color: var(--about-red);
  font-size: 1.1rem;
}
.page-about .about-hero-stripe {
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 6px;
  background: linear-gradient(135deg, var(--about-gold) 0%, var(--about-gold) 40%, transparent 40.5%, transparent 60%, var(--about-gold) 60.5%, var(--about-gold) 100%);
  background-size: 20px 6px;
  z-index: 1;
}

/* 品牌简介 */
.page-about .about-mission {
  padding: 2.5rem 1.25rem;
  background-color: var(--about-gray-light);
}
.page-about .about-mission-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: flex-start;
}
.page-about .about-mission-text {
  flex: 0 0 100%;
}
.page-about .about-section-title {
  font-family: var(--about-font-title);
  font-size: 2rem;
  font-weight: 900;
  color: var(--about-red);
  margin: 0 0 1rem;
  line-height: 1.15;
  letter-spacing: 0.02em;
}
.page-about .about-section-desc {
  font-size: 1rem;
  color: var(--about-white);
  margin: 0 0 0.75rem;
  line-height: 1.7;
  max-width: 680px;
}
.page-about .about-mission-link {
  margin-top: 0.5rem;
  display: inline-block;
}
.page-about .about-mission-visual {
  flex: 0 0 100%;
  width: 100%;
}
.page-about .about-mission-img {
  width: 100%;
  height: auto;
  max-height: 280px;
  object-fit: cover;
  border-radius: 4px;
  display: block;
  border: 2px solid var(--about-gold);
}

/* 数据权威 */
.page-about .about-authority {
  background-color: var(--about-gray);
  position: relative;
  overflow: hidden;
}
.page-about .about-authority-clip {
  padding: 2.5rem 0;
  position: relative;
  background: linear-gradient(170deg, var(--about-black) 0%, var(--about-gray) 40%, var(--about-gray-light) 100%);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 24px), 0 100%);
}
.page-about .about-authority-grid {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 0 1.25rem;
  align-items: flex-start;
}
.page-about .about-authority-chart {
  flex: 0 0 100%;
  position: relative;
  cursor: pointer;
  overflow: hidden;
  border-radius: 4px;
  border: 2px solid var(--about-blue);
  background: var(--about-black);
}
.page-about .about-authority-chart-img {
  width: 100%;
  height: auto;
  display: block;
  transition: filter var(--about-transition);
}
.page-about .about-authority-chart:hover .about-authority-chart-img {
  filter: brightness(0.5);
}
.page-about .about-chart-tooltip {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 0.375rem;
  background: rgba(0,162,255,0.20);
  opacity: 0;
  transition: opacity var(--about-transition);
  padding: 1rem;
  text-align: center;
}
.page-about .about-authority-chart:hover .about-chart-tooltip {
  opacity: 1;
}
.page-about .about-chart-tooltip-label {
  font-family: var(--about-font-title);
  font-size: 1.1rem;
  color: var(--about-white);
  text-transform: uppercase;
}
.page-about .about-chart-tooltip-val {
  font-family: var(--about-font-title);
  font-size: 2rem;
  color: var(--about-blue);
  line-height: 1.2;
}
.page-about .about-chart-tooltip-detail {
  font-size: 0.85rem;
  color: var(--about-white);
  opacity: 0.85;
}
.page-about .about-authority-text {
  flex: 0 0 100%;
}
.page-about .about-authority-list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.page-about .about-authority-list-item {
  position: relative;
  padding-left: 1.5rem;
  font-size: 0.95rem;
  color: var(--about-white);
}
.page-about .about-authority-list-item::before {
  content: "◆";
  position: absolute;
  left: 0;
  color: var(--about-blue);
  font-size: 0.7rem;
  top: 0.2rem;
}

/* 服务范围 */
.page-about .about-services {
  padding: 2.5rem 1.25rem;
  background-color: var(--about-gray-light);
}
.page-about .about-services-title {
  margin-bottom: 0.25rem;
}
.page-about .about-services-desc {
  color: var(--about-gold);
  margin-bottom: 1.5rem;
  font-size: 0.95rem;
}
.page-about .about-services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.25rem;
}
.page-about .about-service-card {
  position: relative;
  background: var(--about-gray);
  padding: 1.5rem 1.25rem 1.25rem;
  border-radius: 0 0 4px 4px;
  border-left: 4px solid var(--about-gold);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
}
.page-about .about-service-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 8px 24px rgba(0,0,0,0.45);
}
.page-about .about-service-card-corner {
  position: absolute;
  top: 0;
  right: 0;
  width: 0;
  height: 0;
  border-style: solid;
  border-width: 0 20px 20px 0;
  border-color: transparent var(--about-gold) transparent transparent;
}
.page-about .about-service-icon {
  width: 48px;
  height: 48px;
  object-fit: contain;
  display: block;
  border-radius: 2px;
  background: var(--about-black);
  padding: 4px;
}
.page-about .about-service-card-title {
  font-family: var(--about-font-title);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--about-red);
  margin: 0;
  line-height: 1.2;
}
.page-about .about-service-card-desc {
  font-size: 0.9rem;
  color: var(--about-white);
  margin: 0;
  line-height: 1.5;
  flex: 1;
}
.page-about .about-service-btn {
  align-self: flex-start;
  margin-top: 0.25rem;
  font-size: 0.85rem;
  padding: 0.35rem 1rem;
}

/* 联系与反馈 */
.page-about .about-contact {
  padding: 2.5rem 1.25rem;
  background-color: var(--about-black);
}
.page-about .about-contact-card {
  max-width: 640px;
  margin: 0 auto;
  background: var(--about-gray);
  border: 2px solid var(--about-gold);
  border-radius: 4px;
  padding: 1.75rem 1.5rem;
  text-align: center;
}
.page-about .about-contact-title {
  text-align: center;
}
.page-about .about-contact-note {
  font-size: 0.95rem;
  color: var(--about-gold);
  margin: -0.5rem 0 1.25rem;
  line-height: 1.5;
}
.page-about .about-contact-list {
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  margin-bottom: 1.25rem;
  text-align: left;
}
.page-about .about-contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.375rem 0.75rem;
  padding: 0.5rem 0.75rem;
  background: rgba(0,0,0,0.25);
  border-radius: 2px;
}
.page-about .about-contact-label {
  font-family: var(--about-font-title);
  font-size: 0.8rem;
  color: var(--about-gold);
  text-transform: uppercase;
  min-width: 3.5rem;
}
.page-about .about-contact-value {
  font-size: 0.95rem;
  color: var(--about-white);
  word-break: break-all;
}
.page-about .about-contact-hint {
  font-size: 0.7rem;
  color: var(--about-gray-light);
  width: 100%;
  padding-left: 4.25rem;
}
.page-about .about-contact-link {
  display: inline-block;
}

/* 全局按钮复用增强 */
.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--about-font-body);
  font-weight: 700;
  font-size: 0.9rem;
  padding: 0.5rem 1.25rem;
  border-radius: 2px;
  text-decoration: none;
  transition: background var(--about-transition), color var(--about-transition), border-color var(--about-transition);
  cursor: pointer;
  border: 2px solid transparent;
  line-height: 1.4;
}
.page-about .btn-primary {
  background: var(--about-red);
  color: var(--about-white);
  border-color: var(--about-red);
}
.page-about .btn-primary:hover {
  background: #b71c1c;
  border-color: #b71c1c;
}
.page-about .btn-outline {
  background: transparent;
  color: var(--about-gold);
  border-color: var(--about-gold);
}
.page-about .btn-outline:hover {
  background: var(--about-gold);
  color: var(--about-black);
}

.page-about .container {
  max-width: 1240px;
  margin: 0 auto;
  padding: 0;
}

/* 移动端优先 — 以上均为窄屏样式，下面扩展桌面 */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 5rem 2rem 3rem;
  }
  .page-about .about-hero-title {
    font-size: 5rem;
  }
  .page-about .about-hero-subtitle {
    font-size: 2.25rem;
  }
  .page-about .about-hero-desc {
    font-size: 1.1rem;
  }
  .page-about .about-hero-metric {
    gap: 2rem 3rem;
  }
  .page-about .about-hero-metric-item {
    font-size: 1rem;
    padding: 0.5rem 1.5rem;
  }
  .page-about .about-hero-metric-num {
    font-size: 1.3rem;
  }

  .page-about .about-mission {
    padding: 4rem 2rem;
  }
  .page-about .about-mission-grid {
    flex-direction: row;
    gap: 3rem;
    align-items: center;
  }
  .page-about .about-mission-text {
    flex: 0 0 55%;
  }
  .page-about .about-mission-visual {
    flex: 0 0 40%;
  }
  .page-about .about-mission-img {
    max-height: 360px;
  }
  .page-about .about-section-title {
    font-size: 2.5rem;
  }

  .page-about .about-authority-clip {
    padding: 4rem 0;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 40px), 0 100%);
  }
  .page-about .about-authority-grid {
    flex-direction: row;
    gap: 3rem;
    padding: 0 2rem;
    align-items: center;
  }
  .page-about .about-authority-chart {
    flex: 0 0 48%;
  }
  .page-about .about-authority-text {
    flex: 0 0 45%;
  }
  .page-about .about-chart-tooltip-label {
    font-size: 1.25rem;
  }
  .page-about .about-chart-tooltip-val {
    font-size: 2.5rem;
  }

  .page-about .about-services {
    padding: 4rem 2rem;
  }
  .page-about .about-services-grid {
    grid-template-columns: 1fr 1fr;
    gap: 1.5rem;
  }
  .page-about .about-service-card {
    padding: 1.75rem 1.5rem 1.5rem;
  }
  .page-about .about-service-icon {
    width: 56px;
    height: 56px;
  }

  .page-about .about-contact {
    padding: 4rem 2rem;
  }
  .page-about .about-contact-card {
    padding: 2.5rem 2rem;
  }
  .page-about .about-contact-list {
    gap: 1rem;
  }
  .page-about .about-contact-item {
    padding: 0.6rem 1rem;
    flex-wrap: nowrap;
  }
  .page-about .about-contact-hint {
    width: auto;
    padding-left: 0;
    margin-left: auto;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero {
    padding: 6rem 2rem 3.5rem;
  }
  .page-about .about-hero-title {
    font-size: 6rem;
  }
  .page-about .about-hero-subtitle {
    font-size: 2.75rem;
  }
  .page-about .about-services-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .about-section-title {
    font-size: 3rem;
  }
}