/* ===== 品牌概况页专属样式 ===== */
.page-about {
  --about-gold-glow: 0 0 30px rgba(212, 175, 55, 0.2);
  --about-timeline-width: 4px;
  --about-node-size: 20px;
  --about-hero-min-height: 70vh;

  display: flex;
  flex-direction: column;
  gap: 0;
  max-width: 100%;
  padding: 0;
  background: var(--color-primary, #0A1F3C);
  color: var(--color-light, #E0E0E0);
  font-family: var(--font-body, Georgia, 'Times New Roman', serif);
  line-height: 1.7;
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  padding: 1rem 1.5rem;
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.8rem;
  color: var(--color-gold-dim, rgba(212, 175, 55, 0.6));
  background: rgba(0, 0, 0, 0.35);
  border-bottom: 1px solid var(--color-border-gold, rgba(212, 175, 55, 0.3));
  max-width: var(--max-width, 1320px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
}

.page-about .breadcrumb a {
  color: var(--color-gold-bright, #FFD700);
  text-decoration: none;
  transition: color var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
}

.page-about .breadcrumb a:hover {
  color: var(--color-neon, #39FF14);
}

.page-about .breadcrumb__sep {
  color: var(--color-gold-dim, rgba(212, 175, 55, 0.4));
  user-select: none;
}

/* ===== 品牌首屏 ===== */
.page-about .brand-hero {
  display: flex;
  flex-direction: column;
  max-width: var(--max-width, 1320px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  padding: 0 1.5rem;
  min-height: var(--about-hero-min-height, 70vh);
}

.page-about .brand-hero__left {
  background: linear-gradient(145deg, #0C2444 0%, #08152A 100%);
  padding: 3rem 2rem;
  border-radius: var(--radius-card, 20px);
  border: 1px solid var(--color-border-gold, rgba(212, 175, 55, 0.3));
  box-shadow: var(--about-gold-glow);
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  position: relative;
  overflow: hidden;
}

.page-about .brand-hero__left::before {
  content: '';
  position: absolute;
  inset: 0;
  background:
    radial-gradient(circle at 20% 30%, rgba(212, 175, 55, 0.08) 0%, transparent 60%),
    radial-gradient(circle at 80% 70%, rgba(57, 255, 20, 0.05) 0%, transparent 50%);
  pointer-events: none;
}

.page-about .brand-hero__emblem {
  width: 120px;
  height: auto;
  max-width: 100%;
  object-fit: contain;
  margin-bottom: 1.5rem;
  filter: drop-shadow(0 0 20px rgba(212, 175, 55, 0.3));
  position: relative;
  z-index: 1;
}

.page-about .brand-hero__title {
  font-family: var(--font-head, 'Arial Black', 'Impact', sans-serif);
  font-size: clamp(3rem, 12vw, 6rem);
  font-weight: 900;
  letter-spacing: 0.06em;
  color: transparent;
  background: linear-gradient(135deg, var(--color-gold, #D4AF37) 0%, var(--color-gold-bright, #FFD700) 60%, #F9E076 100%);
  -webkit-background-clip: text;
  background-clip: text;
  line-height: 1.1;
  margin: 0 0 0.5rem;
  text-shadow: none;
  position: relative;
  z-index: 1;
}

.page-about .brand-hero__accent {
  width: 80px;
  height: 4px;
  background: linear-gradient(90deg, var(--color-neon, #39FF14), var(--color-gold, #D4AF37));
  border-radius: 2px;
  margin: 0.75rem auto 1.25rem;
  position: relative;
  z-index: 1;
}

.page-about .brand-hero__tagline {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: clamp(0.85rem, 2.5vw, 1.05rem);
  color: var(--color-neon, #39FF14);
  letter-spacing: 0.15em;
  text-transform: uppercase;
  margin: 0 0 0.75rem;
  opacity: 0.9;
  position: relative;
  z-index: 1;
}

.page-about .brand-hero__desc {
  font-family: var(--font-body, Georgia, 'Times New Roman', serif);
  font-size: clamp(0.95rem, 2vw, 1.1rem);
  color: var(--color-light, #E0E0E0);
  max-width: 520px;
  margin: 0;
  line-height: 1.8;
  opacity: 0.85;
  position: relative;
  z-index: 1;
}

/* 右栏 - 时间轴 */
.page-about .brand-hero__right {
  padding: 2rem 0 0;
  flex: 1;
}

.page-about .brand-hero__intro {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.85rem;
  color: var(--color-gold-dim, rgba(212, 175, 55, 0.7));
  letter-spacing: 0.1em;
  text-transform: uppercase;
  margin: 0 0 1.5rem;
  padding-left: calc(var(--about-node-size, 20px) / 2 + 1rem);
}

/* 时间轴容器 */
.page-about .timeline {
  position: relative;
  padding-left: calc(var(--about-node-size, 20px) + 1.5rem);
}

/* 纵向连线 */
.page-about .timeline::before {
  content: '';
  position: absolute;
  left: calc(var(--about-node-size, 20px) / 2 + 0.25rem);
  top: 0;
  bottom: 0;
  width: var(--about-timeline-width, 4px);
  background: linear-gradient(to bottom, var(--color-gold, #D4AF37), var(--color-neon, #39FF14), var(--color-gold, #D4AF37));
  border-radius: 2px;
  opacity: 0.5;
}

/* 单个时间轴条目 */
.page-about .timeline__item {
  position: relative;
  margin-bottom: 1.25rem;
}

.page-about .timeline__item:last-child {
  margin-bottom: 0;
}

/* 可点击头部 */
.page-about .timeline__head {
  display: flex;
  align-items: center;
  gap: 1rem;
  width: 100%;
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border-gold, rgba(212, 175, 55, 0.25));
  border-radius: var(--radius-sm, 12px);
  padding: 1rem 1.25rem 1rem 1rem;
  cursor: pointer;
  transition: all var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
  font-family: var(--font-head, 'Arial Black', 'Impact', sans-serif);
  font-size: 1rem;
  color: var(--color-light, #E0E0E0);
  text-align: left;
  position: relative;
  box-sizing: border-box;
}

.page-about .timeline__head:hover {
  background: rgba(212, 175, 55, 0.1);
  border-color: var(--color-gold, #D4AF37);
  transform: translateX(4px);
  box-shadow: var(--about-gold-glow);
}

.page-about .timeline__head:focus-visible {
  outline: 2px solid var(--color-gold, #D4AF37);
  outline-offset: 2px;
}

/* 节点圆点 */
.page-about .timeline__node {
  flex-shrink: 0;
  width: var(--about-node-size, 20px);
  height: var(--about-node-size, 20px);
  border-radius: 50%;
  background: var(--color-gold, #D4AF37);
  border: 3px solid var(--color-primary, #0A1F3C);
  box-shadow: 0 0 0 2px var(--color-gold-dim, rgba(212, 175, 55, 0.4));
  position: absolute;
  left: calc(-1 * (var(--about-node-size, 20px) + 1.5rem + 0.25rem));
  top: 50%;
  transform: translateY(-50%);
  transition: background var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1)), box-shadow var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
  z-index: 2;
}

.page-about .timeline__head:hover .timeline__node {
  background: var(--color-neon, #39FF14);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.4);
}

/* 标签文字 */
.page-about .timeline__label {
  font-family: var(--font-head, 'Arial Black', 'Impact', sans-serif);
  font-size: clamp(0.95rem, 2.2vw, 1.15rem);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-gold-bright, #FFD700);
  flex: 1;
}

/* 展开箭头 */
.page-about .timeline__arrow {
  flex-shrink: 0;
  width: 24px;
  height: 24px;
  position: relative;
  transition: transform var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
}

.page-about .timeline__arrow::before,
.page-about .timeline__arrow::after {
  content: '';
  position: absolute;
  background: var(--color-gold-dim, rgba(212, 175, 55, 0.6));
  border-radius: 1px;
  transition: background var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
}

.page-about .timeline__arrow::before {
  width: 12px;
  height: 2px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
}

.page-about .timeline__arrow::after {
  width: 2px;
  height: 12px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  transition: transform var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1)), opacity var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
}

/* 展开状态 */
.page-about .timeline__head[aria-expanded="true"] .timeline__arrow::after {
  transform: translate(-50%, -50%) rotate(90deg);
  opacity: 0;
}

.page-about .timeline__head[aria-expanded="true"] .timeline__arrow::before {
  background: var(--color-neon, #39FF14);
}

/* 详情区域 */
.page-about .timeline__detail {
  overflow: hidden;
  max-height: 0;
  opacity: 0;
  transition: max-height 0.5s ease, opacity 0.4s ease, padding 0.4s ease;
  padding: 0 1rem 0 calc(1rem + var(--about-node-size, 20px) + 0.5rem);
  font-family: var(--font-body, Georgia, 'Times New Roman', serif);
  font-size: 0.95rem;
  color: var(--color-light, #E0E0E0);
  line-height: 1.8;
  border-left: 2px solid var(--color-gold-dim, rgba(212, 175, 55, 0.2));
  margin-left: calc(var(--about-node-size, 20px) / 2 + 0.25rem);
  box-sizing: border-box;
}

.page-about .timeline__head[aria-expanded="true"] + .timeline__detail {
  max-height: 600px;
  opacity: 1;
  padding-top: 0.75rem;
  padding-bottom: 1rem;
}

.page-about .timeline__detail p {
  margin: 0 0 0.75rem;
}

.page-about .timeline__detail p:last-child {
  margin-bottom: 0;
}

.page-about .timeline__img {
  width: 100%;
  max-width: 360px;
  height: auto;
  border-radius: var(--radius-sm, 12px);
  margin-top: 0.75rem;
  border: 1px solid var(--color-border-gold, rgba(212, 175, 55, 0.2));
  object-fit: cover;
  display: block;
}

/* ===== 价值承诺区 ===== */
.page-about .commitment {
  max-width: var(--max-width, 1320px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  padding: 3rem 1.5rem 2rem;
}

.page-about .section-title {
  font-family: var(--font-head, 'Arial Black', 'Impact', sans-serif);
  font-size: clamp(1.8rem, 5vw, 2.8rem);
  font-weight: 900;
  letter-spacing: 0.03em;
  margin: 0 0 2rem;
  line-height: 1.2;
  text-align: center;
}

.page-about .section-title--light {
  color: var(--color-light, #E0E0E0);
  position: relative;
  display: inline-block;
  width: 100%;
}

.page-about .section-title--light::after {
  content: '';
  display: block;
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-gold, #D4AF37), var(--color-neon, #39FF14));
  border-radius: 2px;
  margin: 0.75rem auto 0;
}

.page-about .section-title--gold {
  color: var(--color-gold-bright, #FFD700);
  position: relative;
  display: inline-block;
  width: 100%;
}

.page-about .section-title--gold::after {
  content: '';
  display: block;
  width: 80px;
  height: 3px;
  background: linear-gradient(90deg, var(--color-neon, #39FF14), var(--color-gold, #D4AF37));
  border-radius: 2px;
  margin: 0.75rem auto 0;
}

.page-about .commitment__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
}

.page-about .commitment__card {
  background: rgba(255, 255, 255, 0.03);
  border: 1px solid var(--color-border-gold, rgba(212, 175, 55, 0.25));
  border-radius: var(--radius-card, 20px);
  padding: 2rem 1.75rem;
  transition: all var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 0.75rem;
}

.page-about .commitment__card:hover {
  border-color: var(--color-gold, #D4AF37);
  transform: translateY(-4px);
  box-shadow: var(--about-gold-glow), var(--shadow-float, 0 8px 40px rgba(0,0,0,0.5));
  background: rgba(212, 175, 55, 0.06);
}

.page-about .commitment__icon {
  flex-shrink: 0;
  width: 48px;
  height: 48px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .commitment__icon svg {
  width: 100%;
  height: 100%;
}

.page-about .commitment__title {
  font-family: var(--font-head, 'Arial Black', 'Impact', sans-serif);
  font-size: 1.2rem;
  font-weight: 700;
  color: var(--color-gold-bright, #FFD700);
  margin: 0;
  letter-spacing: 0.02em;
}

.page-about .commitment__text {
  font-family: var(--font-body, Georgia, 'Times New Roman', serif);
  font-size: 0.95rem;
  color: var(--color-light, #E0E0E0);
  line-height: 1.7;
  margin: 0;
  opacity: 0.85;
}

/* ===== 联系方式 ===== */
.page-about .contact-section {
  max-width: var(--max-width, 1320px);
  margin: 0 auto;
  width: 100%;
  box-sizing: border-box;
  padding: 1rem 1.5rem 3rem;
}

.page-about .contact-card {
  background: var(--color-warm, #F5F0E8);
  border: 2px solid var(--color-gold, #D4AF37);
  border-radius: var(--radius-card, 20px);
  padding: 2rem 1.75rem;
  box-shadow: var(--about-gold-glow), var(--shadow-float, 0 8px 40px rgba(0,0,0,0.5));
  display: flex;
  flex-direction: column;
  gap: 1.5rem;
  color: var(--color-dark, #111111);
}

.page-about .contact-card__inner {
  display: flex;
  flex-direction: column;
  gap: 1.25rem;
}

.page-about .contact-card__item {
  display: flex;
  flex-direction: column;
  gap: 0.25rem;
}

.page-about .contact-card__label {
  font-family: var(--font-mono, 'JetBrains Mono', monospace);
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.1em;
  color: var(--color-gold, #D4AF37);
  font-weight: 700;
}

.page-about .contact-card__value {
  font-family: var(--font-head, 'Arial Black', 'Impact', sans-serif);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-primary, #0A1F3C);
  word-break: break-word;
}

.page-about .contact-card__value a {
  color: var(--color-primary, #0A1F3C);
  text-decoration: none;
  transition: color var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
}

.page-about .contact-card__value a:hover {
  color: var(--color-gold, #D4AF37);
}

.page-about .contact-card__note {
  font-family: var(--font-body, Georgia, 'Times New Roman', serif);
  font-size: 0.85rem;
  color: #555;
  margin: 0.25rem 0 0;
  line-height: 1.6;
  max-width: 480px;
}

.page-about .contact-card__action {
  display: flex;
  justify-content: flex-start;
}

.page-about .btn-gold {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
  padding: 0.75rem 2rem;
  background: var(--color-gold, #D4AF37);
  color: var(--color-primary, #0A1F3C);
  font-family: var(--font-head, 'Arial Black', 'Impact', sans-serif);
  font-size: 0.95rem;
  font-weight: 700;
  text-decoration: none;
  border-radius: var(--radius-capsule, 60px);
  border: none;
  cursor: pointer;
  transition: all var(--transition-smooth, 0.35s cubic-bezier(0.22, 1, 0.36, 1));
  box-shadow: 0 4px 16px rgba(212, 175, 55, 0.3);
  letter-spacing: 0.03em;
}

.page-about .btn-gold:hover {
  background: var(--color-gold-bright, #FFD700);
  transform: translateY(-2px);
  box-shadow: 0 6px 24px rgba(212, 175, 55, 0.45);
}

.page-about .btn-gold:focus-visible {
  outline: 2px solid var(--color-neon, #39FF14);
  outline-offset: 3px;
}

/* ===== 桌面端响应式 ===== */
@media (min-width: 768px) {
  .page-about .brand-hero {
    flex-direction: row;
    gap: 2rem;
    padding: 2rem 2rem 3rem;
    min-height: auto;
  }

  .page-about .brand-hero__left {
    flex: 0 0 42%;
    align-items: flex-start;
    text-align: left;
    padding: 3.5rem 2.5rem;
    min-height: 480px;
    justify-content: center;
  }

  .page-about .brand-hero__emblem {
    width: 160px;
    margin-bottom: 2rem;
  }

  .page-about .brand-hero__accent {
    margin-left: 0;
    margin-right: 0;
  }

  .page-about .brand-hero__desc {
    max-width: 100%;
  }

  .page-about .brand-hero__right {
    flex: 1;
    padding: 1rem 0 0;
    display: flex;
    flex-direction: column;
    justify-content: center;
  }

  .page-about .brand-hero__intro {
    padding-left: calc(var(--about-node-size, 20px) + 1.5rem);
  }

  .page-about .timeline {
    padding-left: calc(var(--about-node-size, 20px) + 2rem);
  }

  .page-about .timeline__node {
    left: calc(-1 * (var(--about-node-size, 20px) + 2rem + 0.25rem));
  }

  .page-about .timeline__detail {
    padding-left: calc(1rem + var(--about-node-size, 20px) + 0.75rem);
    margin-left: calc(var(--about-node-size, 20px) / 2 + 0.25rem);
  }

  .page-about .commitment__grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 2rem;
  }

  .page-about .commitment__card {
    padding: 2.5rem 2rem;
  }

  .page-about .contact-card {
    padding: 2.5rem 3rem;
  }

  .page-about .contact-card__inner {
    flex-direction: row;
    flex-wrap: wrap;
    gap: 2rem;
  }

  .page-about .contact-card__item {
    flex: 1;
    min-width: 200px;
  }

  .page-about .contact-card__action {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-about .brand-hero__left {
    flex: 0 0 45%;
    padding: 4rem 3rem;
    min-height: 520px;
  }

  .page-about .brand-hero__emblem {
    width: 200px;
  }

  .page-about .brand-hero__title {
    font-size: clamp(4rem, 6vw, 6rem);
  }

  .page-about .commitment {
    padding: 4rem 2rem 3rem;
  }

  .page-about .contact-section {
    padding: 1rem 2rem 4rem;
  }
}

/* 超大屏 */
@media (min-width: 1400px) {
  .page-about .brand-hero {
    padding: 3rem 0 4rem;
  }

  .page-about .brand-hero__left {
    flex: 0 0 44%;
    padding: 5rem 4rem;
    min-height: 560px;
  }

  .page-about .commitment {
    padding: 5rem 0 3rem;
  }

  .page-about .contact-section {
    padding: 1rem 0 5rem;
  }
}

/* 减少动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .timeline__head:hover {
    transform: none;
  }

  .page-about .commitment__card:hover {
    transform: none;
  }

  .page-about .btn-gold:hover {
    transform: none;
  }
}

/* 焦点样式 */
.page-about :focus-visible {
  outline: 2px solid var(--color-gold, #D4AF37);
  outline-offset: 3px;
}

/* 可展开交互的渐进增强 */
.page-about .timeline__detail {
  display: block;
}

.page-about .timeline__head[aria-expanded="false"] + .timeline__detail {
  max-height: 0;
  opacity: 0;
  padding-top: 0;
  padding-bottom: 0;
  overflow: hidden;
}