/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --hero-min-height: 70vh;
  --card-border-color: linear-gradient(135deg, #B0BEC5, #ECEFF1);
  --glow-color: #00BCD4;
  display: block;
  max-width: var(--max-width, 1200px);
  margin: 0 auto;
  padding: var(--space-md, 1rem);
  color: var(--color-text, #F5F7FA);
  background-color: var(--color-bg, #0A0E27);
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-xs, 0.25rem);
  margin-bottom: var(--space-lg, 2rem);
  font-family: var(--font-body, Arial, sans-serif);
  font-size: var(--font-base, 1rem);
  color: var(--color-text-muted, #8C9EAB);
  line-height: 1.4;
}
.page-about .breadcrumb a {
  color: var(--color-text-muted, #8C9EAB);
  text-decoration: none;
  transition: color var(--transition, 0.3s ease);
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus {
  color: var(--color-accent, #FF6B35);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--color-text, #F5F7FA);
  font-weight: 600;
}

/* ---- 首屏 ---- */
.page-about .hero {
  position: relative;
  min-height: var(--hero-min-height);
  display: flex;
  align-items: center;
  justify-content: flex-start;
  overflow: hidden;
  padding: var(--space-xl, 3rem) var(--space-md, 1rem);
  margin-bottom: var(--space-2xl, 4rem);
}
.page-about .hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  opacity: 0.25;
  z-index: 0;
  pointer-events: none;
}
.page-about .hero-particles {
  position: absolute;
  inset: 0;
  z-index: 1;
  pointer-events: none;
  background: radial-gradient(circle at 20% 50%, rgba(0,188,212,0.08) 0%, transparent 60%);
}
.page-about .hero-content {
  position: relative;
  z-index: 2;
  max-width: 780px;
}
.page-about .hero-sub {
  font-family: var(--font-heading, Georgia, serif);
  font-size: 1rem;
  font-weight: 400;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--color-accent, #FF6B35);
  margin: 0 0 var(--space-sm, 0.5rem);
  line-height: 1.4;
}
.page-about .hero-title {
  font-family: var(--font-heading, Georgia, serif);
  font-size: 2.4rem;
  font-weight: 700;
  font-style: italic;
  letter-spacing: 0.04em;
  line-height: 1.15;
  color: var(--color-text, #F5F7FA);
  margin: 0 0 var(--space-md, 1rem);
  text-shadow: 0 2px 24px rgba(0,0,0,0.6);
}
.page-about .hero-deco {
  display: inline-block;
  font-family: var(--font-body, Arial, sans-serif);
  font-size: 0.8rem;
  font-weight: 300;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: transparent;
  background: linear-gradient(135deg, #B0BEC5, #ECEFF1);
  -webkit-background-clip: text;
  background-clip: text;
  transform: skewX(-12deg);
  margin-bottom: var(--space-md, 1rem);
  padding: 0.1em 0.4em;
  border-left: 2px solid var(--color-accent, #FF6B35);
  line-height: 1.6;
}
.page-about .hero-desc {
  font-family: var(--font-body, Arial, sans-serif);
  font-size: 1rem;
  line-height: var(--line-body, 1.6);
  color: var(--color-text-muted, #8C9EAB);
  max-width: 560px;
  margin: 0 0 var(--space-lg, 2rem);
}
.page-about .hero-cta {
  display: inline-block;
  background-color: var(--color-accent, #FF6B35);
  color: var(--color-text, #F5F7FA);
  padding: 0.75rem 2rem;
  font-family: var(--font-body, Arial, sans-serif);
  font-weight: 600;
  font-size: 1rem;
  text-decoration: none;
  border: none;
  cursor: pointer;
  transition: background-color var(--transition, 0.3s ease), transform 0.15s ease;
  line-height: 1.4;
}
.page-about .hero-cta:hover,
.page-about .hero-cta:focus {
  background-color: var(--color-accent-dark, #D84315);
  transform: scale(0.97);
}

/* ---- 通用 section 标题 ---- */
.page-about .section-title {
  font-family: var(--font-heading, Georgia, serif);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: 0.06em;
  color: var(--color-text, #F5F7FA);
  margin: 0 0 var(--space-lg, 2rem);
  padding-bottom: var(--space-sm, 0.5rem);
  border-bottom: 2px solid;
  border-image: linear-gradient(135deg, #B0BEC5, #ECEFF1) 1;
}

/* ---- 核心价值 ---- */
.page-about .values {
  margin-bottom: var(--space-2xl, 4rem);
}
.page-about .values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-lg, 2rem);
  margin-bottom: var(--space-xl, 3rem);
}
.page-about .value-card {
  background-color: var(--color-bg-elevated, #12183A);
  padding: var(--space-lg, 2rem);
  border: 1px solid transparent;
  border-image: linear-gradient(135deg, #B0BEC5, #ECEFF1) 1;
  transition: box-shadow var(--transition, 0.3s ease), border-color var(--transition, 0.3s ease);
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}
.page-about .value-card:hover,
.page-about .value-card:focus-within {
  box-shadow: 0 0 20px rgba(0,188,212,0.35), inset 0 0 20px rgba(0,188,212,0.08);
  border-color: var(--glow-color, #00BCD4);
}
.page-about .value-icon {
  width: 100%;
  max-width: 160px;
  margin-bottom: var(--space-md, 1rem);
  overflow: hidden;
  background-color: rgba(10,14,39,0.5);
  display: flex;
  align-items: center;
  justify-content: center;
}
.page-about .value-icon img {
  width: 100%;
  height: auto;
  max-height: 120px;
  object-fit: contain;
  display: block;
}
.page-about .value-name {
  font-family: var(--font-heading, Georgia, serif);
  font-size: 1.15rem;
  font-weight: 700;
  color: var(--color-text, #F5F7FA);
  margin: 0 0 var(--space-sm, 0.5rem);
  letter-spacing: 0.03em;
}
.page-about .value-brief {
  font-family: var(--font-body, Arial, sans-serif);
  font-size: 0.925rem;
  line-height: var(--line-body, 1.6);
  color: var(--color-text-muted, #8C9EAB);
  margin: 0;
}

/* ---- 标签页 ---- */
.page-about .tabs-container {
  background-color: var(--color-bg-elevated, #12183A);
  padding: var(--space-md, 1rem) var(--space-md, 1rem) var(--space-lg, 2rem);
  border: 1px solid transparent;
  border-image: linear-gradient(135deg, #B0BEC5, #ECEFF1) 1;
}
.page-about .tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 0;
  border-bottom: 1px solid var(--color-text-muted, #8C9EAB);
  margin-bottom: var(--space-md, 1rem);
}
.page-about .tab-btn {
  font-family: var(--font-body, Arial, sans-serif);
  font-size: 0.9rem;
  font-weight: 500;
  letter-spacing: 0.06em;
  color: var(--color-text-muted, #8C9EAB);
  background: transparent;
  border: none;
  padding: 0.6rem 1.2rem;
  cursor: pointer;
  position: relative;
  transition: color var(--transition, 0.3s ease);
  line-height: 1.4;
}
.page-about .tab-btn[aria-selected="true"] {
  color: var(--color-accent, #FF6B35);
}
.page-about .tab-btn[aria-selected="true"]::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent, #FF6B35);
}
.page-about .tab-btn:hover,
.page-about .tab-btn:focus {
  color: var(--color-text, #F5F7FA);
}
.page-about .tab-panel {
  font-family: var(--font-body, Arial, sans-serif);
  font-size: 0.95rem;
  line-height: var(--line-body, 1.6);
  color: var(--color-text-muted, #8C9EAB);
  padding: var(--space-sm, 0.5rem) 0;
}
.page-about .tab-panel[hidden] {
  display: none;
}
.page-about .tab-panel p {
  margin: 0;
}

/* ---- 技术承诺 ---- */
.page-about .tech {
  margin-bottom: var(--space-2xl, 4rem);
}
.page-about .tech-body {
  font-family: var(--font-body, Arial, sans-serif);
  font-size: 1rem;
  line-height: var(--line-body, 1.6);
  color: var(--color-text-muted, #8C9EAB);
  max-width: 780px;
}
.page-about .tech-body p {
  margin: 0 0 var(--space-md, 1rem);
}
.page-about .tech-link {
  display: inline-block;
  color: var(--color-accent, #FF6B35);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--transition, 0.3s ease), color var(--transition, 0.3s ease);
  line-height: 1.4;
}
.page-about .tech-link:hover,
.page-about .tech-link:focus {
  color: var(--color-glow, #00BCD4);
  border-bottom-color: var(--color-glow, #00BCD4);
}

/* ---- 联系信息 ---- */
.page-about .contact-info {
  margin-bottom: var(--space-2xl, 4rem);
}
.page-about .contact-card {
  background-color: var(--color-bg-elevated, #12183A);
  padding: var(--space-lg, 2rem);
  max-width: 640px;
}
.page-about .contact-row {
  display: flex;
  flex-direction: column;
  gap: var(--space-xs, 0.25rem);
  margin-bottom: var(--space-md, 1rem);
  font-family: var(--font-body, Arial, sans-serif);
  font-size: 0.95rem;
  line-height: 1.5;
}
.page-about .contact-label {
  color: var(--color-accent, #FF6B35);
  font-weight: 600;
  letter-spacing: 0.04em;
  min-width: 6em;
}
.page-about .contact-value {
  color: var(--color-text, #F5F7FA);
  word-break: break-word;
}
.page-about .contact-value a {
  color: inherit;
  text-decoration: none;
  transition: color var(--transition, 0.3s ease);
}
.page-about .contact-value a:hover,
.page-about .contact-value a:focus {
  color: var(--color-glow, #00BCD4);
}
.page-about .contact-divider {
  margin: var(--space-md, 1rem) 0;
}
.page-about .contact-note {
  font-family: var(--font-body, Arial, sans-serif);
  font-size: 0.875rem;
  line-height: var(--line-body, 1.6);
  color: var(--color-text-muted, #8C9EAB);
  margin: 0 0 var(--space-md, 1rem);
  font-style: italic;
  padding: var(--space-sm, 0.5rem) 0 0;
  border-top: 1px solid rgba(140,158,171,0.25);
}
.page-about .contact-cta {
  display: inline-block;
  background-color: transparent;
  color: var(--color-accent, #FF6B35);
  padding: 0.5rem 1.5rem;
  font-family: var(--font-body, Arial, sans-serif);
  font-weight: 600;
  font-size: 0.95rem;
  text-decoration: none;
  border: 1px solid var(--color-accent, #FF6B35);
  cursor: pointer;
  transition: background-color var(--transition, 0.3s ease), color var(--transition, 0.3s ease);
  line-height: 1.4;
}
.page-about .contact-cta:hover,
.page-about .contact-cta:focus {
  background-color: var(--color-accent, #FF6B35);
  color: var(--color-text, #F5F7FA);
}

/* ---- 装饰线 ---- */
.page-about .deco-line {
  border: none;
  height: 1px;
  background: linear-gradient(135deg, #B0BEC5, #ECEFF1);
  margin: var(--space-xl, 3rem) 0;
}

/* ===== 桌面端适配 ===== */
@media (min-width: 768px) {
  .page-about {
    padding: var(--space-lg, 2rem) var(--space-xl, 3rem);
  }
  .page-about .hero {
    min-height: 65vh;
    padding: var(--space-2xl, 4rem) var(--space-lg, 2rem);
  }
  .page-about .hero-title {
    font-size: 3.2rem;
  }
  .page-about .hero-deco {
    font-size: 1rem;
  }
  .page-about .hero-desc {
    font-size: 1.1rem;
  }
  .page-about .section-title {
    font-size: 1.9rem;
  }
  .page-about .values-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: var(--space-xl, 3rem);
  }
  .page-about .value-card {
    padding: var(--space-xl, 3rem) var(--space-lg, 2rem);
  }
  .page-about .value-icon {
    max-width: 200px;
  }
  .page-about .value-icon img {
    max-height: 150px;
  }
  .page-about .value-name {
    font-size: 1.3rem;
  }
  .page-about .tabs-container {
    padding: var(--space-lg, 2rem);
  }
  .page-about .tab-btn {
    font-size: 1rem;
    padding: 0.75rem 1.8rem;
  }
  .page-about .tab-panel {
    font-size: 1rem;
  }
  .page-about .tech-body {
    font-size: 1.05rem;
  }
  .page-about .contact-card {
    padding: var(--space-xl, 3rem);
  }
  .page-about .contact-row {
    flex-direction: row;
    align-items: baseline;
    gap: var(--space-md, 1rem);
  }
  .page-about .contact-label {
    min-width: 7em;
  }
}

@media (min-width: 1024px) {
  .page-about .hero-title {
    font-size: 4rem;
  }
  .page-about .hero {
    padding: var(--space-2xl, 4rem) var(--space-xl, 3rem);
  }
  .page-about .section-title {
    font-size: 2.2rem;
  }
}