/* ===== page-about 专属样式 ===== */
.page-about {
  --color-mineral-clay: #C17F5B;
  --color-mineral-moss: #7A9E7A;
  --color-mineral-stone: #8C8C8C;
  --color-mineral-gold: #F5A623;
  --timeline-width: 180px;
  --card-min-height: 280px;

  display: flex;
  flex-direction: column;
  background-color: var(--color-bg-light);
  color: var(--color-text);
  font-family: var(--font-body);
  line-height: 1.6;
  padding: 0 0 var(--spacing-xl) 0;
}

/* ---- 面包屑 ---- */
.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: var(--spacing-sm) var(--spacing-md);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  font-size: var(--size-small);
  color: var(--color-primary);
  font-family: var(--font-accent);
}
.page-about__breadcrumb a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s;
}
.page-about__breadcrumb a:hover {
  border-bottom-color: var(--color-accent-gold);
}
.page-about__breadcrumb-sep {
  color: var(--color-border-subtle);
  font-size: 0.85rem;
}
.page-about__breadcrumb [aria-current="page"] {
  color: var(--color-accent-red);
  font-weight: 600;
}

/* ---- Hero ---- */
.page-about__hero {
  position: relative;
  width: 100%;
  max-width: var(--max-width);
  margin: 0 auto var(--spacing-lg) auto;
  overflow: hidden;
  border-radius: 4px;
}
.page-about__hero-img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  object-position: center 30%;
}
.page-about__hero-overlay {
  position: absolute;
  inset: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-md);
  background: linear-gradient(135deg, rgba(15,29,43,0.55) 0%, rgba(26,59,92,0.35) 100%);
  padding: var(--spacing-md);
}
.page-about__vertical-label {
  writing-mode: vertical-rl;
  font-family: var(--font-accent);
  font-weight: 300;
  font-size: 0.85rem;
  letter-spacing: 0.15em;
  color: rgba(255,255,255,0.85);
  text-orientation: mixed;
  padding: 0.25rem 0;
  border-left: 1px solid rgba(255,255,255,0.3);
  padding-left: 0.35rem;
  line-height: 1.4;
}
.page-about__hero-title {
  font-family: var(--font-heading);
  font-size: clamp(1.8rem, 5vw, var(--size-title));
  font-weight: 700;
  color: #ffffff;
  margin: 0;
  letter-spacing: 0.05em;
  text-shadow: 0 2px 8px rgba(0,0,0,0.3);
}
.page-about__hero-subtitle {
  font-family: var(--font-accent);
  font-size: clamp(0.9rem, 2vw, 1.25rem);
  color: rgba(255,255,255,0.85);
  margin: 0;
  letter-spacing: 0.08em;
  font-weight: 300;
}

/* ---- 主布局 ---- */
.page-about__main {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
  max-width: var(--max-width);
  margin: 0 auto;
  width: 100%;
  padding: 0 var(--spacing-md);
}

/* ========= 时间线 ========= */
.page-about__timeline {
  display: flex;
  flex-direction: row;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  padding: var(--spacing-md) 0;
  border-bottom: 2px solid var(--color-border-subtle);
  margin-bottom: var(--spacing-sm);
}
.page-about__timeline-item {
  position: relative;
  flex: 0 1 auto;
  min-width: 80px;
}
.page-about__timeline-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 0.3rem;
  text-decoration: none;
  color: var(--color-text);
  cursor: pointer;
  transition: transform 0.25s;
  padding: 0.25rem 0.5rem;
  border-radius: 4px;
}
.page-about__timeline-marker:hover {
  transform: translateY(-2px);
}
.page-about__timeline-dot {
  display: block;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background-color: var(--node-color, var(--color-primary));
  border: 2px solid var(--color-bg-light);
  box-shadow: 0 0 0 2px var(--node-color, var(--color-primary));
  transition: box-shadow 0.3s, transform 0.3s;
}
.page-about__timeline-marker:hover .page-about__timeline-dot {
  transform: scale(1.25);
  box-shadow: 0 0 0 3px var(--node-color, var(--color-primary)), 0 0 0 6px rgba(245,166,35,0.2);
}
.page-about__timeline-label {
  font-family: var(--font-accent);
  font-size: var(--size-small);
  font-weight: 600;
  color: var(--color-primary);
  letter-spacing: 0.04em;
  white-space: nowrap;
}
.page-about__timeline-preview {
  display: none;
  position: absolute;
  top: calc(100% + 0.5rem);
  left: 50%;
  transform: translateX(-50%);
  background: var(--color-bg-dark);
  color: var(--color-text-dark);
  font-size: var(--size-small);
  padding: 0.5rem 0.85rem;
  border-radius: 6px;
  white-space: nowrap;
  box-shadow: 0 4px 16px rgba(0,0,0,0.15);
  z-index: 10;
  font-family: var(--font-accent);
  line-height: 1.4;
  pointer-events: none;
}
.page-about__timeline-preview::before {
  content: "";
  position: absolute;
  bottom: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-bottom-color: var(--color-bg-dark);
}
.page-about__timeline-item:hover .page-about__timeline-preview {
  display: block;
}

/* ========= 卡片区 ========= */
.page-about__cards {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-lg);
}

/* ---- 玻璃卡片通用 ---- */
.page-about__card {
  position: relative;
  min-height: var(--card-min-height);
  background: rgba(255,255,255,0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--color-border-subtle);
  border-radius: 12px;
  padding: var(--spacing-lg);
  transition: box-shadow 0.4s, border-color 0.3s, transform 0.3s;
  overflow: hidden;
}
.page-about__card:hover {
  box-shadow: 0 8px 32px rgba(26,59,92,0.10);
  border-color: var(--color-primary);
  transform: translateY(-3px);
}
.page-about__card-body {
  position: relative;
  z-index: 2;
}
.page-about__card-number {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 2rem;
  font-weight: 700;
  line-height: 1;
  color: var(--card-num-color, var(--color-primary));
  opacity: 0.3;
  margin-bottom: 0.25rem;
  transition: opacity 0.3s;
}
.page-about__card:hover .page-about__card-number {
  opacity: 0.6;
}
.page-about__card-heading {
  font-family: var(--font-heading);
  font-size: var(--size-subtitle);
  font-weight: 700;
  color: var(--color-primary);
  margin: 0 0 var(--spacing-xs) 0;
  line-height: 1.3;
}
.page-about__card-text {
  font-family: var(--font-body);
  font-size: var(--size-body);
  color: var(--color-text);
  margin: 0 0 var(--spacing-sm) 0;
  max-width: 520px;
}
.page-about__card-link {
  display: inline-block;
  font-family: var(--font-accent);
  font-size: var(--size-small);
  font-weight: 600;
  color: var(--color-accent-red);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s, color 0.25s;
  margin-top: var(--spacing-xs);
}
.page-about__card-link:hover {
  border-bottom-color: var(--color-accent-red);
  color: var(--color-primary);
}

/* ---- Brand Story 卡片 ---- */
.page-about__card-bg-img {
  position: absolute;
  right: 0;
  bottom: 0;
  width: 45%;
  max-width: 300px;
  height: auto;
  object-fit: contain;
  opacity: 0.25;
  pointer-events: none;
  transition: opacity 0.5s;
  z-index: 1;
}
.page-about__card:hover .page-about__card-bg-img {
  opacity: 0.40;
}

/* ---- 翻转卡片（数据与覆盖） ---- */
.page-about__card--flip {
  perspective: 1200px;
  padding: 0;
  background: transparent;
  border: none;
  backdrop-filter: none;
  -webkit-backdrop-filter: none;
  box-shadow: none;
  transform: none !important;
}
.page-about__card--flip:hover {
  box-shadow: none;
  border-color: transparent;
  transform: none !important;
}
.page-about__card-inner {
  position: relative;
  width: 100%;
  min-height: var(--card-min-height);
  transition: transform 0.7s cubic-bezier(0.23, 1, 0.32, 1);
  transform-style: preserve-3d;
  border-radius: 12px;
}
.page-about__card--flip:hover .page-about__card-inner {
  transform: rotateY(180deg);
}
.page-about__card-front,
.page-about__card-back {
  position: absolute;
  inset: 0;
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  border-radius: 12px;
  padding: var(--spacing-lg);
  background: rgba(255,255,255,0.55);
  backdrop-filter: blur(6px);
  -webkit-backdrop-filter: blur(6px);
  border: 1px solid var(--color-border-subtle);
  display: flex;
  flex-direction: column;
  justify-content: flex-start;
}
.page-about__card-back {
  transform: rotateY(180deg);
  background: rgba(15,29,43,0.12);
  backdrop-filter: blur(8px);
  -webkit-backdrop-filter: blur(8px);
  border-color: var(--color-primary);
  justify-content: center;
}
.page-about__card-back .page-about__card-heading {
  color: var(--color-primary);
}
.page-about__card-back .page-about__card-text {
  color: var(--color-text);
}
.page-about__data-img {
  display: block;
  width: 100%;
  max-width: 240px;
  height: auto;
  object-fit: contain;
  margin-top: var(--spacing-sm);
  border-radius: 6px;
}

/* ---- 联系卡片 ---- */
.page-about__contact-list {
  list-style: none;
  margin: 0 0 var(--spacing-sm) 0;
  padding: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-xs);
}
.page-about__contact-item {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.35rem 0.6rem;
  padding: 0.35rem 0;
  border-bottom: 1px dashed var(--color-border-subtle);
}
.page-about__contact-item:last-child {
  border-bottom: none;
}
.page-about__contact-label {
  font-family: var(--font-accent);
  font-size: var(--size-small);
  font-weight: 600;
  color: var(--color-primary);
  min-width: 5em;
}
.page-about__contact-value {
  font-family: var(--font-body);
  font-size: var(--size-body);
  color: var(--color-text);
}
.page-about__contact-note {
  font-family: var(--font-accent);
  font-size: 0.7rem;
  color: var(--color-accent-red);
  font-weight: 500;
}
.page-about__contact-desc {
  font-family: var(--font-accent);
  font-size: var(--size-small);
  color: var(--color-primary);
  opacity: 0.75;
  margin: var(--spacing-xs) 0 0 0;
  line-height: 1.5;
}

/* ========= data-reveal 入场动画 ========= */
.page-about__card[data-reveal] {
  opacity: 0;
  animation: pageAboutFadeUp 0.7s ease forwards;
}
.page-about__card[data-reveal]:nth-child(1) { animation-delay: 0.15s; }
.page-about__card[data-reveal]:nth-child(2) { animation-delay: 0.30s; }
.page-about__card[data-reveal]:nth-child(3) { animation-delay: 0.45s; }
.page-about__card[data-reveal]:nth-child(4) { animation-delay: 0.60s; }
@keyframes pageAboutFadeUp {
  0%   { opacity: 0; transform: translateY(24px); }
  100% { opacity: 1; transform: translateY(0); }
}

/* ============================================
   响应式 – 平板 (≥768px)
   ============================================ */
@media (min-width: 768px) {
  .page-about__main {
    flex-direction: row;
    align-items: flex-start;
    gap: var(--spacing-xl);
  }

  /* ---- 时间线 垂直 ---- */
  .page-about__timeline {
    flex-direction: column;
    flex: 0 0 var(--timeline-width);
    border-bottom: none;
    border-right: 2px solid var(--color-border-subtle);
    padding: var(--spacing-md) var(--spacing-md) var(--spacing-md) 0;
    margin-bottom: 0;
    position: sticky;
    top: 2rem;
    gap: var(--spacing-lg);
  }
  .page-about__timeline-item {
    min-width: auto;
  }
  .page-about__timeline-marker {
    flex-direction: row;
    gap: 0.6rem;
    padding: 0.35rem 0.6rem;
  }
  .page-about__timeline-dot {
    width: 16px;
    height: 16px;
    flex-shrink: 0;
  }
  .page-about__timeline-label {
    font-size: 0.85rem;
    white-space: normal;
  }
  .page-about__timeline-preview {
    top: 50%;
    left: calc(100% + 1rem);
    transform: translateY(-50%);
    white-space: normal;
    min-width: 180px;
  }
  .page-about__timeline-preview::before {
    top: 50%;
    left: auto;
    right: 100%;
    bottom: auto;
    transform: translateY(-50%);
    border: 6px solid transparent;
    border-right-color: var(--color-bg-dark);
  }

  /* ---- 卡片区 ---- */
  .page-about__cards {
    flex: 1;
    min-width: 0;
  }
  .page-about__card {
    padding: var(--spacing-xl);
  }
  .page-about__card-front,
  .page-about__card-back {
    padding: var(--spacing-xl);
  }
  .page-about__card-bg-img {
    width: 35%;
    max-width: 280px;
  }
  .page-about__data-img {
    max-width: 200px;
  }
  .page-about__card--flip .page-about__card-inner {
    min-height: 300px;
  }
}

/* ============================================
   响应式 – 桌面 (≥1024px)
   ============================================ */
@media (min-width: 1024px) {
  .page-about {
    padding: 0 0 var(--spacing-xl) 0;
  }
  .page-about__breadcrumb {
    padding: var(--spacing-md) var(--spacing-lg);
  }
  .page-about__main {
    gap: var(--spacing-xl);
  }
  .page-about__timeline {
    flex: 0 0 200px;
    gap: var(--spacing-xl);
  }
  .page-about__timeline-label {
    font-size: 0.9rem;
  }
  .page-about__card {
    padding: var(--spacing-xl) calc(var(--spacing-xl) * 1.2);
  }
  .page-about__card-front,
  .page-about__card-back {
    padding: var(--spacing-xl) calc(var(--spacing-xl) * 1.2);
  }
  .page-about__card-heading {
    font-size: calc(var(--size-subtitle) * 1.1);
  }
  .page-about__card-text {
    max-width: 600px;
  }
  .page-about__card-bg-img {
    width: 30%;
    max-width: 320px;
  }
  .page-about__card--flip .page-about__card-inner {
    min-height: 320px;
  }
  .page-about__contact-item {
    gap: 0.5rem 1rem;
  }
  .page-about__contact-label {
    min-width: 6em;
  }
}

/* ============================================
   窄屏溢出防护
   ============================================ */
@media (max-width: 480px) {
  .page-about__hero-overlay {
    flex-direction: column;
    gap: var(--spacing-xs);
    text-align: center;
    padding: var(--spacing-sm);
  }
  .page-about__vertical-label {
    writing-mode: horizontal-tb;
    border-left: none;
    padding-left: 0;
    border-bottom: 1px solid rgba(255,255,255,0.3);
    padding-bottom: 0.25rem;
    font-size: 0.75rem;
  }
  .page-about__hero-title {
    font-size: 1.5rem;
  }
  .page-about__timeline {
    gap: var(--spacing-xs);
    justify-content: center;
  }
  .page-about__timeline-item {
    flex: 0 0 auto;
  }
  .page-about__timeline-label {
    font-size: 0.65rem;
  }
  .page-about__card {
    padding: var(--spacing-md);
  }
  .page-about__card-front,
  .page-about__card-back {
    padding: var(--spacing-md);
  }
  .page-about__card-number {
    font-size: 1.5rem;
  }
  .page-about__card-heading {
    font-size: 1.2rem;
  }
  .page-about__card-bg-img {
    display: none;
  }
  .page-about__data-img {
    max-width: 160px;
  }
  .page-about__card--flip .page-about__card-inner {
    min-height: 340px;
  }
  .page-about__contact-label {
    min-width: 4em;
    font-size: 0.7rem;
  }
  .page-about__contact-value {
    font-size: 0.85rem;
  }
}
</style>

.page-about {
  --card-num-color: currentColor;
  --node-color: none;
}