.page-about {
  --brand-title-size: clamp(2.8rem, 8vw, 5.5rem);
  --brand-char-gap: 0.05em;
  --skill-card-gap: 1.5rem;
  --skill-node-size: 14px;
  --orbit-ring-color: rgba(240, 192, 64, 0.18);
  --hex-size: 90px;
  --hero-padding-top: 0.5rem;

  display: flex;
  flex-direction: column;
  background-color: var(--color-primary-dark);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  line-height: 1.6;
}

/* ── 面包屑 ── */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem 0.6rem;
  padding: 1.2rem 1.5rem 0;
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  font-size: 0.875rem;
  color: var(--color-text-secondary);
}
.page-about .breadcrumb-link {
  color: var(--color-accent-gold);
  text-decoration: none;
  transition: color var(--transition-base);
}
.page-about .breadcrumb-link:hover {
  color: var(--color-accent-green);
}
.page-about .breadcrumb-link::after {
  content: "／";
  margin-left: 0.6rem;
  color: var(--color-text-secondary);
}
.page-about .breadcrumb-item {
  color: var(--color-text-primary);
  font-weight: 500;
}

/* ── 首屏左右分屏 ── */
.page-about .hero-split {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  padding: var(--hero-padding-top) 1.5rem 4rem;
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  position: relative;
}

/* 左侧：品牌叙事 */
.page-about .hero-left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 1rem;
  flex: 1 1 50%;
}

.page-about .brand-title {
  margin: 0;
  font-family: var(--font-heading);
  font-size: var(--brand-title-size);
  line-height: 1.05;
  color: var(--color-text-primary);
  text-shadow: 0 0 20px var(--color-accent-gold), 0 0 40px rgba(240, 192, 64, 0.3);
  letter-spacing: var(--brand-char-gap);
  display: flex;
  flex-wrap: wrap;
}

.page-about .brand-char {
  display: inline-block;
  opacity: 0;
  animation: brandFadeIn 0.6s cubic-bezier(0.22, 1, 0.36, 1) forwards;
  animation-delay: calc(0.12s * var(--char-index));
}

@keyframes brandFadeIn {
  0% {
    opacity: 0;
    transform: translateY(1.2rem) scale(0.95);
    filter: blur(4px);
  }
  60% {
    filter: blur(0);
  }
  100% {
    opacity: 1;
    transform: translateY(0) scale(1);
    filter: blur(0);
  }
}

.page-about .brand-tagline {
  margin: 0.2rem 0 0;
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--color-accent-gold);
  letter-spacing: 0.08em;
  text-shadow: 0 0 12px rgba(240, 192, 64, 0.25);
  line-height: 1.3;
}

.page-about .brand-desc {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 540px;
  line-height: 1.8;
}

.page-about .brand-image {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 600 / 800;
  object-fit: cover;
  object-position: center;
  border-radius: var(--border-radius-sharp);
  box-shadow: 0 0 30px rgba(240, 192, 64, 0.15);
  margin-top: 0.5rem;
  border: 1px solid var(--color-border-subtle);
}

/* 右侧：技能树服务卡片 */
.page-about .hero-right {
  flex: 1 1 50%;
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  position: relative;
}

.page-about .skill-tree-label {
  margin: 0;
  font-size: 0.8rem;
  text-transform: uppercase;
  letter-spacing: 0.15em;
  color: var(--color-accent-gold);
  opacity: 0.7;
  font-weight: 600;
}

.page-about .skill-tree {
  display: flex;
  flex-direction: column;
  gap: var(--skill-card-gap);
  position: relative;
  padding-left: calc(var(--skill-node-size) + 1.2rem);
}

/* 纵向轨道竖线 */
.page-about .skill-tree::before {
  content: "";
  position: absolute;
  left: calc(var(--skill-node-size) / 2);
  top: 0.6rem;
  bottom: 0.6rem;
  width: 2px;
  background: linear-gradient(to bottom, var(--color-accent-gold), var(--color-accent-green), var(--color-accent-gold));
  opacity: 0.5;
  border-radius: 1px;
}

.page-about .skill-card {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 1rem;
  padding: 1.2rem 1.2rem 1.2rem 1.8rem;
  background-color: var(--color-surface-light);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--border-radius-sharp);
  transition: border-color var(--transition-base), box-shadow var(--transition-base), transform var(--transition-base);
  cursor: default;
}

/* 每个卡片左侧的轨道节点 */
.page-about .skill-node {
  position: absolute;
  left: calc(-1 * var(--skill-node-size) - 0.6rem);
  top: 1.6rem;
  width: var(--skill-node-size);
  height: var(--skill-node-size);
  border-radius: 50%;
  background-color: var(--color-primary-dark);
  border: 2px solid var(--color-accent-gold);
  box-shadow: 0 0 10px rgba(240, 192, 64, 0.25);
  z-index: 1;
  transition: box-shadow var(--transition-base), background-color var(--transition-base);
}

/* 节点与竖线之间的连接弧线（模拟轨道） */
.page-about .skill-card::before {
  content: "";
  position: absolute;
  left: calc(-1 * var(--skill-node-size) - 0.6rem + var(--skill-node-size) / 2);
  top: calc(1.6rem + var(--skill-node-size) / 2 - 1px);
  width: 1.6rem;
  height: 2px;
  background: var(--color-accent-gold);
  opacity: 0.4;
}

/* 卡片悬停效果 */
.page-about .skill-card:hover {
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 25px var(--color-hover-glow);
  transform: translateX(4px);
}
.page-about .skill-card:hover .skill-node {
  background-color: var(--color-accent-gold);
  box-shadow: 0 0 18px rgba(240, 192, 64, 0.5);
}
.page-about .skill-card:hover .skill-hover-desc {
  opacity: 1;
  max-height: 100px;
}

.page-about .skill-icon-wrap {
  flex-shrink: 0;
  width: 56px;
  height: 56px;
  display: flex;
  align-items: center;
  justify-content: center;
  clip-path: polygon(50% 0, 100% 25%, 100% 75%, 50% 100%, 0 75%, 0 25%);
  background-color: rgba(240, 192, 64, 0.12);
  border: 1px solid var(--color-accent-gold);
}

.page-about .skill-icon {
  width: 48px;
  height: 48px;
  object-fit: cover;
  object-position: center;
  display: block;
}

.page-about .skill-content {
  flex: 1;
  min-width: 0;
}

.page-about .skill-heading {
  margin: 0 0 0.2rem;
  font-size: 1.15rem;
  font-family: var(--font-heading);
  color: var(--color-text-primary);
  letter-spacing: 0.04em;
}

.page-about .skill-brief {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.page-about .skill-hover-desc {
  margin: 0.5rem 0 0;
  font-size: 0.85rem;
  color: var(--color-accent-green);
  line-height: 1.6;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity 0.35s ease, max-height 0.4s ease;
}

/* ── 我们的服务 ── */
.page-about .services-section {
  padding: 4rem 1.5rem;
  background-color: rgba(10, 25, 48, 0.6);
  border-top: 1px solid var(--color-border-subtle);
  border-bottom: 1px solid var(--color-border-subtle);
  position: relative;
}
.page-about .services-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent-gold), transparent);
}

.page-about .container {
  max-width: var(--container-max);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.page-about .section-title {
  margin: 0 0 0.3rem;
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3rem);
  color: var(--color-text-primary);
  text-shadow: 0 0 15px rgba(240, 192, 64, 0.2);
  letter-spacing: 0.03em;
}

.page-about .section-subtitle {
  margin: 0 0 2.5rem;
  font-size: 1.05rem;
  color: var(--color-text-secondary);
  max-width: 600px;
}

.page-about .services-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.8rem;
}

.page-about .service-card {
  position: relative;
  padding: 2rem 1.8rem;
  background-color: var(--color-surface-light);
  border: 1px solid var(--color-border-subtle);
  border-radius: var(--border-radius-sharp);
  transition: border-color var(--transition-base), box-shadow var(--transition-base);
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
}
.page-about .service-card:hover {
  border-color: var(--color-accent-gold);
  box-shadow: 0 0 30px var(--color-hover-glow);
}

.page-about .service-hex {
  width: 48px;
  height: 48px;
  margin-bottom: 0.2rem;
  flex-shrink: 0;
}
.page-about .service-hex polygon {
  transition: stroke-width var(--transition-base), filter var(--transition-base);
}
.page-about .service-card:hover .service-hex polygon {
  stroke-width: 3;
  filter: drop-shadow(0 0 6px rgba(240, 192, 64, 0.4));
}

.page-about .service-heading {
  margin: 0;
  font-size: 1.4rem;
  font-family: var(--font-heading);
  color: var(--color-accent-gold);
  letter-spacing: 0.03em;
}

.page-about .service-text {
  margin: 0;
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  line-height: 1.7;
  flex: 1;
}

.page-about .service-link {
  display: inline-flex;
  align-items: center;
  gap: 0.4rem;
  font-size: 0.9rem;
  color: var(--color-accent-green);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-base), gap var(--transition-base);
  margin-top: 0.4rem;
}
.page-about .service-link:hover {
  color: var(--color-accent-gold);
  gap: 0.7rem;
}
.page-about .service-link::after {
  content: "→";
  transition: transform var(--transition-base);
}
.page-about .service-link:hover::after {
  transform: translateX(3px);
}

/* ── 更新承诺 ── */
.page-about .update-section {
  padding: 4rem 1.5rem;
  position: relative;
}
.page-about .update-section::before {
  content: "";
  position: absolute;
  top: 0;
  left: 10%;
  right: 10%;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--color-accent-green), transparent);
}

.page-about .update-content {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  align-items: flex-start;
}

.page-about .update-text {
  display: flex;
  flex-direction: column;
  gap: 1rem;
  flex: 1;
}

.page-about .update-statement {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 640px;
}
.page-about .update-statement strong {
  color: var(--color-accent-gold);
  font-weight: 700;
}

.page-about .update-visual {
  display: flex;
  flex-direction: column;
  gap: 0.6rem;
  align-items: flex-start;
}

.page-about .update-image {
  width: 100%;
  max-width: 400px;
  height: auto;
  aspect-ratio: 400 / 200;
  object-fit: cover;
  object-position: center;
  border-radius: var(--border-radius-sharp);
  border: 1px solid var(--color-border-subtle);
  box-shadow: 0 0 20px rgba(0, 255, 136, 0.08);
}

.page-about .update-caption {
  margin: 0;
  font-size: 0.85rem;
  color: var(--color-accent-green);
  letter-spacing: 0.06em;
  font-weight: 500;
}

.page-about .btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: 0.7rem 1.8rem;
  font-size: 0.95rem;
  font-weight: 600;
  font-family: var(--font-body);
  text-decoration: none;
  border: 2px solid transparent;
  border-radius: var(--border-radius-sharp);
  cursor: pointer;
  transition: background-color var(--transition-base), color var(--transition-base), border-color var(--transition-base), box-shadow var(--transition-base);
  letter-spacing: 0.04em;
}
.page-about .btn-primary {
  background-color: var(--color-accent-gold);
  color: var(--color-primary-dark);
  border-color: var(--color-accent-gold);
}
.page-about .btn-primary:hover {
  background-color: transparent;
  color: var(--color-accent-gold);
  box-shadow: 0 0 20px var(--color-hover-glow);
}
.page-about .btn-secondary {
  background-color: transparent;
  color: var(--color-accent-gold);
  border-color: var(--color-accent-gold);
}
.page-about .btn-secondary:hover {
  background-color: var(--color-accent-gold);
  color: var(--color-primary-dark);
  box-shadow: 0 0 20px var(--color-hover-glow);
}

/* ── 联系区 ── */
.page-about .contact-section {
  padding: 3rem 1.5rem 4rem;
  border-top: 1px solid var(--color-border-subtle);
}

.page-about .contact-content {
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  align-items: flex-start;
}

.page-about .contact-text {
  margin: 0;
  font-size: 1rem;
  color: var(--color-text-secondary);
  line-height: 1.8;
  max-width: 600px;
}

.page-about .contact-link {
  color: var(--color-accent-gold);
  text-decoration: none;
  font-weight: 600;
  transition: color var(--transition-base);
}
.page-about .contact-link:hover {
  color: var(--color-accent-green);
}

/* ── 响应式：平板及以上 ── */
@media (min-width: 768px) {
  .page-about .hero-split {
    flex-direction: row;
    gap: 3rem;
    padding-top: 1rem;
  }

  .page-about .hero-left {
    padding-right: 1rem;
  }

  .page-about .hero-right {
    padding-top: 0.8rem;
  }

  .page-about .brand-image {
    max-width: 340px;
  }

  .page-about .services-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.5rem;
  }

  .page-about .update-content {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
  }

  .page-about .update-text {
    max-width: 55%;
  }

  .page-about .skill-tree {
    padding-left: calc(var(--skill-node-size) + 1.8rem);
  }
}

/* ── 桌面优化 ── */
@media (min-width: 1024px) {
  .page-about .hero-split {
    gap: 4rem;
  }

  .page-about .hero-left {
    padding-right: 2rem;
  }

  .page-about .brand-image {
    max-width: 400px;
  }

  .page-about .skill-card {
    padding: 1.5rem 1.8rem 1.5rem 2.2rem;
  }

  .page-about .skill-heading {
    font-size: 1.3rem;
  }

  .page-about .services-grid {
    gap: 2rem;
  }

  .page-about .service-card {
    padding: 2.2rem 2rem;
  }

  .page-about .section-title {
    font-size: 2.8rem;
  }
}

/* ── 防止横向溢出 ── */
.page-about img,
.page-about svg,
.page-about .container,
.page-about .hero-split,
.page-about .services-section,
.page-about .update-section,
.page-about .contact-section {
  max-width: 100%;
  box-sizing: border-box;
}

.page-about .breadcrumb,
.page-about .hero-split,
.page-about .services-section .container,
.page-about .update-section .container,
.page-about .contact-section .container {
  overflow-wrap: break-word;
  word-wrap: break-word;
}

/* ── 焦点可见性 ── */
.page-about a:focus-visible,
.page-about button:focus-visible {
  outline: 2px solid var(--color-accent-gold);
  outline-offset: 3px;
}

.page-about {
  --char-index: inherit;
}