/* ===== 品牌档案页专属样式 ===== */
.page-about {
  --page-about-hero-min-height: 70vh;
  --page-about-timeline-line-color: rgba(242, 140, 40, 0.3);
  --page-about-card-shadow: 0 4px 20px rgba(0, 0, 0, 0.08);
  --page-about-card-shadow-hover: 0 8px 32px rgba(0, 0, 0, 0.14);
  --page-about-transition: 0.35s cubic-bezier(0.25, 0.46, 0.45, 0.94);

  display: block;
  width: 100%;
  background-color: var(--clr-primary-bg);
  color: var(--clr-primary-text);
}

/* ===== Hero 区域 ===== */
.page-about__hero {
  position: relative;
  min-height: var(--page-about-hero-min-height);
  display: flex;
  align-items: center;
  justify-content: center;
  overflow: hidden;
}

.page-about__hero-bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center 30%;
  z-index: 0;
}

.page-about__hero-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: linear-gradient(
    135deg,
    rgba(10, 10, 10, 0.85) 0%,
    rgba(10, 10, 10, 0.50) 60%,
    rgba(10, 10, 10, 0.30) 100%
  );
}

.page-about__hero-content {
  position: relative;
  z-index: 2;
  padding: var(--spacing-xl) var(--spacing-sm);
  text-align: center;
  max-width: 720px;
  margin: 0 auto;
}

.page-about .breadcrumb {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: 0.4rem;
  margin-bottom: var(--spacing-md);
  font-family: var(--font-heading);
  font-size: 0.85rem;
  font-weight: 400;
  color: rgba(255, 255, 255, 0.60);
}

.page-about .breadcrumb__link {
  color: var(--clr-accent);
  text-decoration: none;
  transition: color var(--page-about-transition);
}

.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--clr-accent-hover);
  text-decoration: underline;
}

.page-about .breadcrumb__sep {
  color: rgba(255, 255, 255, 0.40);
  padding: 0 0.1rem;
}

.page-about .breadcrumb__current {
  color: rgba(255, 255, 255, 0.80);
  font-weight: 600;
}

.page-about__hero-title {
  font-family: var(--font-heading);
  font-size: 3.5rem;
  font-weight: 800;
  letter-spacing: -0.03em;
  line-height: 1.05;
  color: var(--clr-primary-text);
  margin: 0 0 var(--spacing-sm) 0;
  text-shadow: 0 2px 12px rgba(0, 0, 0, 0.30);
}

.page-about__hero-subtitle {
  font-family: var(--font-body);
  font-size: 1.1rem;
  font-weight: 300;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.85);
  margin: 0 0 var(--spacing-md) 0;
  max-width: 580px;
  margin-left: auto;
  margin-right: auto;
}

.page-about__hero-tag {
  display: inline-block;
  font-size: 0.85rem;
  font-weight: 600;
  letter-spacing: 0.04em;
}

/* ===== 通用章节 ===== */
.page-about__section {
  padding: var(--spacing-xl) var(--spacing-sm);
}

.page-about__section-heading {
  font-family: var(--font-heading);
  font-size: 2.2rem;
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.15;
  color: var(--clr-primary-text);
  margin: 0 0 var(--spacing-sm) 0;
}

.page-about__section-heading--center {
  text-align: center;
}

.page-about__section-desc {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.75);
  margin: 0 0 var(--spacing-lg) 0;
  max-width: 680px;
}

.page-about__section-desc--center {
  text-align: center;
  margin-left: auto;
  margin-right: auto;
}

.page-about__body-text {
  font-family: var(--font-body);
  font-size: 1.05rem;
  font-weight: 300;
  line-height: 1.75;
  color: rgba(255, 255, 255, 0.80);
  margin: 0 0 var(--spacing-sm) 0;
}

/* ===== 理念板块 ===== */
.page-about__section--philosophy {
  background-color: var(--clr-secondary-bg);
  color: var(--clr-secondary-text);
}

.page-about__section--philosophy .page-about__section-heading {
  color: var(--clr-secondary-text);
}

.page-about__section--philosophy .page-about__body-text {
  color: rgba(26, 26, 26, 0.80);
}

.page-about__philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-lg);
  align-items: start;
}

.page-about__philosophy-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: var(--spacing-md);
}

.page-about__philosophy-visual {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.page-about__philosophy-card {
  background: var(--clr-primary-bg);
  color: var(--clr-primary-text);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  box-shadow: var(--page-about-card-shadow);
  transition: box-shadow var(--page-about-transition), transform var(--page-about-transition);
}

.page-about__philosophy-card:hover {
  box-shadow: var(--page-about-card-shadow-hover);
  transform: translateY(-2px);
}

.page-about__philosophy-card-number {
  font-family: var(--font-heading);
  font-size: 2.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--clr-accent);
  flex-shrink: 0;
  min-width: 2.5rem;
  opacity: 0.70;
}

.page-about__philosophy-card-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.80);
  margin: 0;
}

/* ===== 更新亮点 + 时间线 ===== */
.page-about__section--update {
  background-color: var(--clr-primary-bg);
}

.page-about__update-divider {
  margin-bottom: var(--spacing-lg);
}

.page-about__timeline {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-md);
  padding-left: 2rem;
  margin: var(--spacing-lg) 0;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 0.5rem;
  top: 0.5rem;
  bottom: 0.5rem;
  width: 2px;
  background: var(--page-about-timeline-line-color);
  border-radius: 2px;
}

.page-about__timeline-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: var(--spacing-sm);
  cursor: pointer;
  transition: opacity var(--page-about-transition);
}

.page-about__timeline-item:hover {
  opacity: 0.90;
}

.page-about__timeline-dot {
  position: absolute;
  left: -2rem;
  top: 0.5rem;
  width: 1rem;
  height: 1rem;
  border-radius: 50%;
  background: var(--clr-accent);
  box-shadow: 0 0 0 3px rgba(242, 140, 40, 0.20);
  flex-shrink: 0;
  z-index: 1;
  transition: transform var(--page-about-transition), box-shadow var(--page-about-transition);
}

.page-about__timeline-item:hover .page-about__timeline-dot {
  transform: scale(1.2);
  box-shadow: 0 0 0 5px rgba(242, 140, 40, 0.30);
}

.page-about__timeline-content {
  flex: 1;
  padding: var(--spacing-sm) var(--spacing-md);
  border-radius: var(--radius-md);
  background: rgba(255, 255, 255, 0.04);
  border: 1px solid var(--clr-card-border);
  transition: background var(--page-about-transition), border-color var(--page-about-transition);
}

.page-about__timeline-item:hover .page-about__timeline-content {
  background: rgba(255, 255, 255, 0.07);
  border-color: var(--clr-accent);
}

.page-about__timeline-heading {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--clr-primary-text);
  margin: 0 0 0.3rem 0;
}

.page-about__timeline-text {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 300;
  line-height: 1.6;
  color: rgba(255, 255, 255, 0.70);
  margin: 0;
}

.page-about__update-cta {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-lg);
}

.page-about__update-screenshot {
  width: 100%;
  max-width: 800px;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 24px rgba(0, 0, 0, 0.25);
  border: 1px solid var(--clr-card-border);
  object-fit: cover;
}

/* ===== 城市布局 ===== */
.page-about__section--cities {
  background-color: var(--clr-secondary-bg);
  color: var(--clr-secondary-text);
}

.page-about__section--cities .page-about__section-heading {
  color: var(--clr-secondary-text);
}

.page-about__section--cities .page-about__section-desc {
  color: rgba(26, 26, 26, 0.75);
}

.page-about__cities-header {
  margin-bottom: var(--spacing-lg);
}

.page-about__cities-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-md);
}

.page-about__city-card {
  background: var(--clr-primary-bg);
  color: var(--clr-primary-text);
  padding: var(--spacing-md);
  border-radius: var(--radius-md);
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  box-shadow: var(--page-about-card-shadow);
  transition: box-shadow var(--page-about-transition), transform var(--page-about-transition), border-color var(--page-about-transition);
  cursor: default;
}

.page-about__city-card:hover {
  box-shadow: var(--page-about-card-shadow-hover);
  transform: translateY(-3px);
  border-color: var(--clr-accent);
}

.page-about__city-name {
  font-family: var(--font-heading);
  font-size: 1.4rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--clr-primary-text);
}

.page-about__city-badge {
  align-self: flex-start;
  font-size: 0.75rem;
  font-weight: 600;
}

.page-about__city-desc {
  font-family: var(--font-body);
  font-size: 0.9rem;
  font-weight: 300;
  line-height: 1.5;
  color: rgba(255, 255, 255, 0.70);
  margin: 0.3rem 0 0 0;
}

.page-about__cities-more {
  font-family: var(--font-body);
  font-size: 0.95rem;
  font-weight: 300;
  color: rgba(26, 26, 26, 0.60);
  text-align: center;
  margin: var(--spacing-md) 0;
}

.page-about__cities-image-wrap {
  display: flex;
  justify-content: center;
  margin-top: var(--spacing-md);
}

.page-about__cities-image {
  width: 100%;
  max-width: 500px;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: 0 4px 20px rgba(0, 0, 0, 0.12);
  object-fit: cover;
}

/* ===== 底部导航链接 ===== */
.page-about__section--nav {
  background-color: var(--clr-primary-bg);
  padding-top: var(--spacing-lg);
  padding-bottom: var(--spacing-xl);
}

.page-about__nav-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: var(--spacing-sm);
  margin-top: var(--spacing-md);
}

.page-about .btn--outline {
  border-color: var(--clr-accent);
  color: var(--clr-accent);
  background: transparent;
  padding: 0.6rem 1.8rem;
  font-family: var(--font-heading);
  font-size: 0.95rem;
  font-weight: 600;
  border-radius: var(--radius-full);
  transition: background var(--page-about-transition), color var(--page-about-transition), transform var(--page-about-transition);
  text-decoration: none;
  display: inline-block;
}

.page-about .btn--outline:hover,
.page-about .btn--outline:focus-visible {
  background: var(--clr-accent);
  color: var(--clr-primary-bg);
  transform: translateY(-2px);
}

/* ===== 纸张叠层效果 ===== */
.page-about .paper-stack {
  position: relative;
  z-index: 1;
}

.page-about .paper-stack::before {
  content: '';
  position: absolute;
  inset: 0;
  background: inherit;
  border-radius: inherit;
  box-shadow:
    0 1px 4px rgba(0, 0, 0, 0.06),
    0 4px 16px rgba(0, 0, 0, 0.04);
  z-index: -1;
}

/* ===== 居中印刷边框 ===== */
.page-about .print-border--center {
  width: 60px;
  height: 3px;
  background: var(--clr-accent);
  margin: 0 auto var(--spacing-sm) auto;
  border-radius: 2px;
  opacity: 0.60;
}

/* ===== 标签 ===== */
.page-about .tag {
  display: inline-block;
  background: var(--clr-tag-bg);
  color: var(--clr-tag-text);
  padding: 0.25rem 0.8rem;
  border-radius: var(--radius-full);
  font-family: var(--font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.02em;
  border: 1px solid rgba(242, 140, 40, 0.20);
}

/* ===== 移动端优先 ===== */
@media (max-width: 639px) {
  .page-about__hero-title {
    font-size: 2.4rem;
  }

  .page-about__hero-subtitle {
    font-size: 1rem;
  }

  .page-about__section-heading {
    font-size: 1.6rem;
  }

  .page-about__section {
    padding: var(--spacing-lg) var(--spacing-sm);
  }

  .page-about__timeline {
    padding-left: 1.5rem;
  }

  .page-about__timeline-dot {
    left: -1.5rem;
    width: 0.75rem;
    height: 0.75rem;
  }

  .page-about__philosophy-card-number {
    font-size: 1.8rem;
    min-width: 1.8rem;
  }

  .page-about__city-card {
    padding: var(--spacing-sm);
  }

  .page-about__city-name {
    font-size: 1.15rem;
  }

  .page-about__nav-links {
    flex-direction: column;
    align-items: center;
  }

  .page-about .btn--outline {
    width: 100%;
    max-width: 280px;
    text-align: center;
  }
}

/* ===== 桌面端增强 ===== */
@media (min-width: 640px) {
  .page-about__hero-title {
    font-size: 4.5rem;
  }

  .page-about__hero-subtitle {
    font-size: 1.2rem;
  }

  .page-about__philosophy-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--spacing-xl);
  }

  .page-about__cities-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about__hero-title {
    font-size: 5.5rem;
  }

  .page-about__section-heading {
    font-size: 2.5rem;
  }

  .page-about__cities-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about__timeline {
    padding-left: 3rem;
  }

  .page-about__timeline-dot {
    left: -3rem;
    width: 1.2rem;
    height: 1.2rem;
  }

  .page-about__philosophy-card {
    padding: var(--spacing-lg);
  }
}

/* ===== 打印样式 ===== */
@media print {
  .page-about__hero {
    min-height: auto;
    page-break-after: avoid;
  }

  .page-about__hero-bg {
    display: none;
  }

  .page-about__hero-overlay {
    display: none;
  }

  .page-about__hero-content {
    padding: 2rem 0;
    color: #000;
  }

  .page-about__hero-title,
  .page-about__hero-subtitle,
  .page-about .breadcrumb__link,
  .page-about .breadcrumb__current {
    color: #000;
  }

  .page-about__section {
    padding: 1.5rem 0;
    page-break-inside: avoid;
  }

  .page-about__timeline::before {
    background: #ccc;
  }

  .page-about__timeline-dot {
    background: #333;
    box-shadow: none;
  }

  .page-about__city-card {
    border: 1px solid #ccc;
    box-shadow: none;
  }

  .page-about .btn--outline {
    border-color: #333;
    color: #333;
  }

  .page-about__update-screenshot,
  .page-about__cities-image {
    box-shadow: none;
    border: 1px solid #ddd;
  }
}