.page-about {
  --about-hero-bg: #0A192F;
  --about-diagonal-color: #FF4500;
  --about-card-bg: #1A2A4A;
  --about-card-hover-bg: #0F2040;
  --about-accent-line: #FF4500;
  --about-text-light: #B0BEC5;
  --about-border-color: #C0C0C0;

  display: block;
  background-color: var(--about-hero-bg);
  color: #FFFFFF;
  font-family: var(--font-body, 'Inter', sans-serif);
  overflow-x: hidden;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  padding-top: calc(var(--header-height, 64px) + 1.5rem);
  padding-bottom: 0.5rem;
  font-size: 0.875rem;
  color: var(--about-text-light);
  position: relative;
  z-index: 2;
}
.page-about .breadcrumb a {
  color: var(--about-text-light);
  text-decoration: none;
  transition: color 0.2s;
}
.page-about .breadcrumb a:hover {
  color: var(--about-accent-line);
}
.page-about .breadcrumb-sep {
  margin: 0 0.5rem;
  color: var(--about-border-color);
  opacity: 0.5;
}

/* ===== Hero 区块 ===== */
.page-about__hero {
  position: relative;
  padding: 2rem 0 4rem;
  overflow: hidden;
}
.page-about__hero-inner {
  position: relative;
  z-index: 1;
}
.page-about__hero-panel {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}
.page-about__hero-slogan {
  text-align: center;
  max-width: 600px;
}
.page-about__hero-tagline {
  display: inline-block;
  font-family: var(--font-data, 'Fira Code', monospace);
  font-size: 0.875rem;
  color: var(--about-accent-line);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  border: 1px solid var(--about-accent-line);
  padding: 0.25rem 1rem;
  margin-bottom: 1.5rem;
  opacity: 0.9;
}
.page-about__hero-title {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-weight: 900;
  font-size: 3rem;
  line-height: 1.05;
  margin: 0 0 0.75rem;
  text-transform: uppercase;
  letter-spacing: -0.02em;
  background: linear-gradient(135deg, #FFFFFF 60%, var(--about-accent-line));
  -webkit-background-clip: text;
  -webkit-text-fill-color: transparent;
  background-clip: text;
}
.page-about__hero-sub {
  font-size: 1rem;
  color: var(--about-text-light);
  line-height: 1.5;
  margin: 0;
  max-width: 480px;
  margin-left: auto;
  margin-right: auto;
}
.page-about__hero-visual {
  position: relative;
  max-width: 800px;
  width: 100%;
}
.page-about__hero-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 8px 32px rgba(0,0,0,0.4);
}
.page-about__hero-grid-line {
  position: absolute;
  top: 10%;
  left: -5%;
  width: 110%;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--about-border-color) 0, var(--about-border-color) 4px, transparent 4px, transparent 12px);
  opacity: 0.25;
  pointer-events: none;
}
.page-about__hero-grid-line--vert {
  top: -5%;
  left: 15%;
  width: 1px;
  height: 110%;
  background: repeating-linear-gradient(180deg, var(--about-border-color) 0, var(--about-border-color) 4px, transparent 4px, transparent 12px);
}
.page-about__hero-diagonal {
  display: none;
}

/* ===== 身份区块 ===== */
.page-about__identity {
  padding: 4rem 0;
  position: relative;
}
.page-about__identity-inner {
  display: flex;
  flex-direction: column;
  gap: 3rem;
  align-items: flex-start;
}
.page-about__identity-text {
  flex: 0 0 auto;
  max-width: 680px;
}
.page-about__identity-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: #E0E0E0;
  margin: 1.5rem 0 0;
}
.page-about__identity-stats {
  display: flex;
  gap: 2rem;
  margin-top: 2rem;
  flex-wrap: wrap;
}
.page-about__stat-item {
  text-align: center;
  min-width: 100px;
}
.page-about__stat-num {
  display: block;
  font-family: var(--font-data, 'Fira Code', monospace);
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--about-accent-line);
  letter-spacing: 0.05em;
}
.page-about__stat-label {
  display: block;
  font-size: 0.75rem;
  color: var(--about-text-light);
  text-transform: uppercase;
  letter-spacing: 0.1em;
  margin-top: 0.25rem;
}
.page-about__identity-coord {
  flex: 0 0 auto;
  width: 100%;
  max-width: 400px;
  margin: 0 auto;
  opacity: 0.7;
}
.page-about__identity-svg {
  display: block;
  width: 100%;
  height: auto;
}

/* ===== 核心功能 ===== */
.page-about__features {
  padding: 4rem 0;
  background-color: rgba(255,255,255,0.02);
}
.page-about__features-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-top: 2rem;
}
.page-about__feature-card {
  perspective: 800px;
  height: 220px;
}
.page-about__feature-card-inner {
  position: relative;
  width: 100%;
  height: 100%;
  transition: transform 0.45s ease;
  transform-style: preserve-3d;
  cursor: default;
}
.page-about__feature-card:hover .page-about__feature-card-inner,
.page-about__feature-card:focus-within .page-about__feature-card-inner {
  transform: rotateY(180deg);
}
.page-about__feature-front,
.page-about__feature-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  border-radius: 6px;
  padding: 1.5rem;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  background: var(--about-card-bg);
  border: 1px solid rgba(192,192,192,0.15);
}
.page-about__feature-back {
  transform: rotateY(180deg);
  background: var(--about-card-hover-bg);
  border-color: var(--about-accent-line);
}
.page-about__feature-icon {
  font-size: 2.5rem;
  color: var(--about-accent-line);
  margin-bottom: 0.75rem;
  display: block;
  line-height: 1;
}
.page-about__feature-name {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-weight: 700;
  font-size: 1.125rem;
  margin: 0 0 0.25rem;
  color: #FFFFFF;
}
.page-about__feature-brief {
  font-size: 0.875rem;
  color: var(--about-text-light);
  margin: 0;
}
.page-about__feature-back p {
  font-size: 0.9rem;
  line-height: 1.5;
  color: #E0E0E0;
  margin: 0;
  max-width: 240px;
}

/* ===== 2026适配 ===== */
.page-about__adapt {
  padding: 4rem 0;
}
.page-about__adapt-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: center;
}
.page-about__adapt-visual {
  position: relative;
  max-width: 600px;
  width: 100%;
}
.page-about__adapt-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 4px;
  box-shadow: 0 4px 24px rgba(0,0,0,0.3);
}
.page-about__adapt-pulse {
  position: absolute;
  bottom: 10%;
  right: 8%;
  display: flex;
  gap: 0.5rem;
  align-items: center;
}
.page-about__adapt-dot {
  display: block;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--about-accent-line);
  animation: page-about-pulse-dot 1.8s ease-in-out infinite;
}
.page-about__adapt-dot:nth-child(2) {
  animation-delay: 0.6s;
}
.page-about__adapt-dot:nth-child(3) {
  animation-delay: 1.2s;
}
@keyframes page-about-pulse-dot {
  0%, 100% { opacity: 0.3; transform: scale(0.8); }
  50% { opacity: 1; transform: scale(1.2); }
}
.page-about__adapt-content {
  max-width: 600px;
  text-align: center;
}
.page-about__adapt-desc {
  font-size: 1rem;
  line-height: 1.7;
  color: #E0E0E0;
  margin: 1.5rem 0;
}
.page-about__adapt-list {
  list-style: none;
  padding: 0;
  margin: 0 0 2rem;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  align-items: center;
}
.page-about__adapt-item {
  font-size: 0.95rem;
  color: #FFFFFF;
  padding-left: 1.5rem;
  position: relative;
  font-family: var(--font-data, 'Fira Code', monospace);
}
.page-about__adapt-item::before {
  content: "▸";
  position: absolute;
  left: 0;
  color: var(--about-accent-line);
}
.page-about__adapt-link {
  display: inline-block;
}

/* ===== 服务理念 ===== */
.page-about__philosophy {
  padding: 4rem 0;
  background-color: rgba(255,255,255,0.02);
}
.page-about__philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  margin-top: 2rem;
}
.page-about__philosophy-card {
  background: var(--about-card-bg);
  border-radius: 6px;
  padding: 2rem;
  position: relative;
  border-left: 3px solid var(--about-accent-line);
  opacity: 0;
  animation: page-about-fade-in 0.6s ease forwards;
}
.page-about__philosophy-card:nth-child(1) { animation-delay: 0.1s; }
.page-about__philosophy-card:nth-child(2) { animation-delay: 0.3s; }
.page-about__philosophy-card:nth-child(3) { animation-delay: 0.5s; }
@keyframes page-about-fade-in {
  to { opacity: 1; }
}
.page-about__philosophy-num {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-weight: 900;
  font-size: 2.5rem;
  color: rgba(255,69,0,0.2);
  line-height: 1;
  margin-bottom: 0.5rem;
}
.page-about__philosophy-title {
  font-family: var(--font-heading, 'Montserrat', 'Impact', sans-serif);
  font-weight: 700;
  font-size: 1.25rem;
  margin: 0 0 0.75rem;
  color: #FFFFFF;
}
.page-about__philosophy-text {
  font-size: 0.95rem;
  line-height: 1.6;
  color: #D0D0D0;
  margin: 0;
}
.page-about__philosophy-line {
  width: 60px;
  height: 2px;
  background: var(--about-accent-line);
  margin-top: 1.25rem;
  opacity: 0.6;
}
.page-about__philosophy-flow {
  margin-top: 3rem;
  max-width: 900px;
  width: 100%;
  margin-left: auto;
  margin-right: auto;
}
.page-about__philosophy-flow-img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: 4px;
  opacity: 0.85;
}

/* ===== CTA ===== */
.page-about__cta {
  padding: 3rem 0 5rem;
}
.page-about__cta-inner {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  gap: 1.5rem;
}
.page-about__cta-text {
  font-size: 1.05rem;
  color: var(--about-text-light);
  max-width: 520px;
  margin: 0;
  line-height: 1.5;
}
.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

/* ===== 桌面端（≥768px） ===== */
@media (min-width: 768px) {
  .page-about__hero-panel {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
  .page-about__hero-slogan {
    text-align: left;
    flex: 0 0 45%;
  }
  .page-about__hero-sub {
    margin-left: 0;
    margin-right: 0;
  }
  .page-about__hero-visual {
    flex: 0 0 50%;
  }
  .page-about__hero-diagonal {
    display: block;
    position: absolute;
    top: 0;
    right: -15%;
    width: 40%;
    height: 100%;
    background: linear-gradient(135deg, transparent 40%, rgba(255,69,0,0.08) 100%);
    transform: skewX(-12deg);
    pointer-events: none;
    z-index: 0;
  }
  .page-about__identity-inner {
    flex-direction: row;
    align-items: center;
    gap: 4rem;
  }
  .page-about__identity-text {
    flex: 0 0 55%;
  }
  .page-about__identity-coord {
    flex: 0 0 35%;
  }
  .page-about__features-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about__adapt-inner {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }
  .page-about__adapt-visual {
    flex: 0 0 45%;
  }
  .page-about__adapt-content {
    flex: 0 0 50%;
    text-align: left;
  }
  .page-about__adapt-list {
    align-items: flex-start;
  }
  .page-about__philosophy-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about__philosophy-card {
    padding: 2.5rem 1.5rem;
  }
  .page-about__hero-title {
    font-size: 4.5rem;
  }
  .page-about__hero-sub {
    font-size: 1.125rem;
  }
}

@media (min-width: 1024px) {
  .page-about__features-grid {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about__hero-title {
    font-size: 5.5rem;
  }
  .page-about__identity-desc {
    font-size: 1.1rem;
  }
}