/* ===== 页面专属：page-about（品牌故事） ===== */
.page-about {
  --section-gap: 4rem;
  --accent-bar-width: 4px;
  --timeline-dot-size: 20px;
  --card-radius: 12px;
  --page-max-width: 1200px;
  --color-bg-card: #ffffff;
  --color-border-light: rgba(11, 29, 58, 0.08);
  font-family: var(--font-family);
  color: var(--color-text-primary);
  background: var(--color-background);
  line-height: var(--body-line-height);
  overflow-x: hidden;
}

/* — 面包屑 — */
.page-about .breadcrumb {
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: 1rem 1.5rem 0;
  font-size: 0.8rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: 0.4rem;
}

.page-about .breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  transition: opacity var(--transition-base);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  opacity: 0.7;
  outline: none;
  text-decoration: underline;
}

.page-about .breadcrumb-sep {
  color: var(--color-neutral-dark);
  font-weight: 300;
}

/* — 通用章节结构 — */
.page-about .page-section {
  position: relative;
  max-width: var(--page-max-width);
  margin: 0 auto;
  padding: var(--section-gap) 1.5rem;
}

.page-about .section-number {
  position: absolute;
  top: 1rem;
  left: 1.5rem;
  font-size: 3rem;
  font-weight: 200;
  line-height: 1;
  color: var(--color-primary);
  opacity: 0.06;
  pointer-events: none;
  user-select: none;
  letter-spacing: -0.02em;
}

.page-about .section-index {
  font-size: var(--accent-size);
  font-weight: var(--accent-weight);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.12em;
  margin-bottom: 0.4rem;
}

.page-about .section-header {
  margin-bottom: 2.5rem;
}

.page-about .section-title {
  font-size: 2rem;
  font-weight: var(--heading-weight);
  color: var(--color-primary);
  margin: 0 0 0.5rem;
  line-height: 1.2;
}

.page-about .section-desc {
  font-size: 1rem;
  color: var(--color-text-secondary);
  max-width: 480px;
}

/* — 分割色带 — */
.page-about .section-divider {
  height: 1px;
  max-width: var(--page-max-width);
  margin: 0 auto;
  background: linear-gradient(to right, var(--color-accent) 0%, var(--color-accent-light) 40%, var(--color-neutral-light) 80%);
  opacity: 0.3;
}

/* — 01 英雄区 — */
.page-about .hero-layout {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  margin-top: 1rem;
}

.page-about .hero-text {
  order: 1;
}

.page-about .hero-title {
  font-size: 2.4rem;
  font-weight: 200;
  line-height: 1.15;
  color: var(--color-primary);
  margin: 0 0 0.8rem;
  letter-spacing: -0.02em;
}

.page-about .hero-subtitle {
  font-size: 1.15rem;
  font-weight: 400;
  color: var(--color-text-secondary);
  margin: 0 0 1.2rem;
  line-height: 1.5;
}

.page-about .hero-desc {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  max-width: 460px;
  margin-bottom: 1.8rem;
}

.page-about .hero-visual {
  order: 0;
}

.page-about .hero-img {
  width: 100%;
  height: auto;
  max-width: 600px;
  border-radius: var(--card-radius);
  object-fit: cover;
  display: block;
  box-shadow: 0 8px 32px rgba(11, 29, 58, 0.08);
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}

.page-about .hero-img:hover {
  transform: scale(1.02);
  box-shadow: 0 12px 40px rgba(11, 29, 58, 0.14);
}

/* — 02 时间轴 — */
.page-about .timeline-wrap {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 1.8rem;
}

.page-about .timeline-track {
  display: none;
}

.page-about .timeline-node {
  position: relative;
  display: flex;
  gap: 1rem;
  padding-left: 2rem;
  transition: background var(--transition-base), transform var(--transition-base);
  border-radius: 8px;
  padding: 0.6rem 0.8rem 0.6rem 2.2rem;
}

.page-about .timeline-node:hover,
.page-about .timeline-node:focus-within {
  background: rgba(255, 107, 53, 0.04);
  transform: translateX(4px);
}

.page-about .tl-marker {
  position: absolute;
  left: 0;
  top: 0.8rem;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .tl-dot {
  width: var(--timeline-dot-size);
  height: var(--timeline-dot-size);
  border-radius: 50%;
  background: var(--color-white);
  border: 3px solid var(--color-accent);
  display: block;
  transition: background var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  box-shadow: 0 0 0 0 rgba(255, 107, 53, 0);
}

.page-about .timeline-node:hover .tl-dot,
.page-about .timeline-node:focus-within .tl-dot {
  background: var(--color-accent);
  transform: scale(1.25);
  box-shadow: 0 0 0 6px rgba(255, 107, 53, 0.15);
}

.page-about .tl-line {
  width: 2px;
  height: calc(100% + 1.8rem);
  background: var(--color-neutral-light);
  display: block;
  margin-top: 4px;
  flex: 1;
}

.page-about .timeline-node:last-child .tl-line {
  display: none;
}

.page-about .tl-content {
  flex: 1;
}

.page-about .tl-step {
  display: inline-block;
  font-size: 0.7rem;
  font-weight: 600;
  color: var(--color-white);
  background: var(--color-primary);
  padding: 0.1rem 0.5rem;
  border-radius: 4px;
  letter-spacing: 0.06em;
  margin-bottom: 0.3rem;
}

.page-about .tl-heading {
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 0.25rem;
}

.page-about .tl-desc {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.5;
}

.page-about .tl-detail {
  font-size: 0.85rem;
  color: var(--color-text-secondary);
  margin: 0.3rem 0 0;
  padding: 0.5rem 0.7rem;
  background: rgba(255, 107, 53, 0.05);
  border-left: 3px solid var(--color-accent);
  border-radius: 0 6px 6px 0;
  opacity: 0.8;
  transition: opacity var(--transition-base);
}

.page-about .timeline-node:hover .tl-detail,
.page-about .timeline-node:focus-within .tl-detail {
  opacity: 1;
}

.page-about .timeline-fig {
  margin-top: 1rem;
  display: flex;
  justify-content: center;
}

.page-about .tl-img {
  width: 100%;
  max-width: 200px;
  height: auto;
  border-radius: 8px;
  object-fit: contain;
  display: block;
  opacity: 0.85;
  transition: opacity var(--transition-base), transform var(--transition-base);
}

.page-about .tl-img:hover {
  opacity: 1;
  transform: scale(1.03);
}

.page-about .timeline-cta {
  margin-top: 1.8rem;
  text-align: center;
}

/* — 03 价值观 — */
.page-about .values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .value-card {
  background: var(--color-bg-card);
  border-radius: var(--card-radius);
  padding: 1.8rem 1.5rem;
  position: relative;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth), border-color var(--transition-base);
  border: 1px solid var(--color-border-light);
  box-shadow: 0 2px 12px rgba(11, 29, 58, 0.04);
  cursor: default;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 12px), calc(100% - 12px) 100%, 0 100%);
}

.page-about .value-card:hover,
.page-about .value-card:focus-within {
  transform: translateY(-4px);
  box-shadow: 0 12px 32px rgba(11, 29, 58, 0.10);
  border-color: var(--color-accent);
}

.page-about .vc-icon-wrap {
  width: 80px;
  height: 80px;
  margin-bottom: 1rem;
  border-radius: 12px;
  background: var(--color-background);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background var(--transition-base), transform var(--transition-base);
}

.page-about .value-card:hover .vc-icon-wrap {
  background: rgba(255, 107, 53, 0.06);
  transform: scale(1.04);
}

.page-about .vc-icon {
  width: 80px;
  height: 80px;
  object-fit: contain;
  display: block;
}

.page-about .vc-title {
  font-size: 1.3rem;
  font-weight: 600;
  color: var(--color-primary);
  margin: 0 0 0.4rem;
}

.page-about .vc-brief {
  font-size: 0.95rem;
  color: var(--color-text-secondary);
  margin: 0 0 0.5rem;
  line-height: 1.5;
}

.page-about .vc-full {
  font-size: 0.88rem;
  color: var(--color-text-secondary);
  margin: 0;
  padding-top: 0.5rem;
  border-top: 1px solid var(--color-neutral-light);
  line-height: 1.6;
  opacity: 0.7;
  transition: opacity var(--transition-base);
}

.page-about .value-card:hover .vc-full,
.page-about .value-card:focus-within .vc-full {
  opacity: 1;
}

.page-about .vc-hint {
  position: absolute;
  bottom: 1rem;
  right: 1.2rem;
  font-size: 0.7rem;
  color: var(--color-accent);
  letter-spacing: 0.06em;
  opacity: 0.3;
  transition: opacity var(--transition-base);
}

.page-about .value-card:hover .vc-hint,
.page-about .value-card:focus-within .vc-hint {
  opacity: 0.8;
}

/* — 04 联系方式 — */
.page-about .contact-panel {
  background: var(--color-bg-card);
  border-radius: var(--card-radius);
  padding: 2rem 1.5rem;
  border: 1px solid var(--color-border-light);
  box-shadow: 0 2px 12px rgba(11, 29, 58, 0.04);
  display: flex;
  flex-direction: column;
  gap: 1.2rem;
  max-width: 600px;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 14px), calc(100% - 14px) 100%, 0 100%);
}

.page-about .contact-item {
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  padding-bottom: 0.8rem;
  border-bottom: 1px solid var(--color-neutral-light);
}

.page-about .contact-item:last-of-type {
  border-bottom: none;
}

.page-about .contact-label {
  font-size: 0.75rem;
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}

.page-about .contact-value {
  font-size: 1rem;
  color: var(--color-primary);
  font-weight: 500;
}

.page-about .contact-note {
  background: rgba(11, 29, 58, 0.03);
  border-radius: 8px;
  padding: 1rem 1.2rem;
  border-left: 4px solid var(--color-accent);
}

.page-about .contact-note p {
  font-size: 0.9rem;
  color: var(--color-text-secondary);
  margin: 0;
  line-height: 1.6;
}

.page-about .contact-panel .btn-cta {
  align-self: flex-start;
  margin-top: 0.4rem;
}

/* — 共享类覆盖（限定在page-about内） — */
.page-about .btn-cta {
  display: inline-block;
  background: var(--color-accent);
  color: var(--color-white);
  font-size: var(--accent-size);
  font-weight: var(--accent-weight);
  padding: 0.7rem 1.8rem;
  border-radius: 6px;
  text-decoration: none;
  transition: background var(--transition-base), transform var(--transition-base), box-shadow var(--transition-base);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 6px), calc(100% - 6px) 100%, 0 100%);
}

.page-about .btn-cta:hover,
.page-about .btn-cta:focus-visible {
  background: #e55a2b;
  transform: translateY(-2px);
  box-shadow: 0 6px 20px rgba(255, 107, 53, 0.3);
  outline: none;
}

.page-about .btn-ghost {
  background: transparent;
  color: var(--color-accent);
  border: 2px solid var(--color-accent);
  clip-path: none;
  border-radius: 6px;
}

.page-about .btn-ghost:hover,
.page-about .btn-ghost:focus-visible {
  background: var(--color-accent);
  color: var(--color-white);
  box-shadow: none;
}

/* — 桌面 ≥768px — */
@media (min-width: 768px) {
  .page-about {
    --section-gap: 5.5rem;
  }

  .page-about .breadcrumb {
    padding: 1.5rem 2rem 0;
    font-size: 0.85rem;
  }

  .page-about .page-section {
    padding: var(--section-gap) 2rem;
  }

  .page-about .section-number {
    top: 1.5rem;
    left: 2rem;
    font-size: 5rem;
    opacity: 0.05;
  }

  .page-about .section-title {
    font-size: 2.6rem;
  }

  /* 01 英雄区 — 非对称并排 */
  .page-about .hero-layout {
    flex-direction: row;
    align-items: center;
    gap: 3rem;
    margin-top: 0;
  }

  .page-about .hero-text {
    order: 0;
    flex: 1.2;
  }

  .page-about .hero-visual {
    order: 1;
    flex: 1;
    display: flex;
    justify-content: flex-end;
  }

  .page-about .hero-title {
    font-size: 3.2rem;
  }

  .page-about .hero-subtitle {
    font-size: 1.3rem;
  }

  .page-about .hero-img {
    max-width: 100%;
    border-radius: 16px;
  }

  /* 02 时间轴 — 增加侧边轨道感 */
  .page-about .timeline-wrap {
    position: relative;
    padding-left: 1rem;
  }

  .page-about .timeline-track {
    display: block;
    position: absolute;
    left: 0.5rem;
    top: 0;
    bottom: 0;
    width: 3px;
    background: linear-gradient(to bottom, var(--color-accent), var(--color-accent-light), var(--color-neutral-light));
    border-radius: 2px;
    opacity: 0.25;
  }

  .page-about .timeline-node {
    padding: 0.8rem 1.2rem 0.8rem 3rem;
    border-left: none;
  }

  .page-about .tl-marker {
    left: 0.2rem;
    top: 0.9rem;
  }

  .page-about .tl-dot {
    width: 24px;
    height: 24px;
    border-width: 4px;
  }

  .page-about .tl-content {
    max-width: 620px;
  }

  .page-about .timeline-fig {
    justify-content: flex-end;
    margin-top: 0.5rem;
  }

  .page-about .tl-img {
    max-width: 180px;
  }

  /* 03 价值观 — 三列网格 */
  .page-about .values-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 1.8rem;
  }

  .page-about .value-card {
    padding: 2rem 1.8rem;
  }

  .page-about .vc-full {
    opacity: 0.5;
  }

  .page-about .value-card:hover .vc-full {
    opacity: 1;
  }

  /* 04 联系方式 */
  .page-about .contact-panel {
    padding: 2.5rem 2rem;
  }

  .page-about .contact-item {
    flex-direction: row;
    align-items: baseline;
    gap: 1rem;
  }

  .page-about .contact-label {
    min-width: 100px;
  }
}

/* — 桌面 ≥1024px — */
@media (min-width: 1024px) {
  .page-about .hero-title {
    font-size: 3.8rem;
  }

  .page-about .hero-layout {
    gap: 4rem;
  }

  .page-about .timeline-node {
    padding-left: 3.5rem;
  }

  .page-about .section-divider {
    height: 2px;
    background: linear-gradient(to right, var(--color-accent) 0%, var(--color-accent-light) 30%, var(--color-neutral-light) 70%, transparent 100%);
  }
}