/* =============================================
   page-about 专属样式
   作用域限定在 .page-about 内
   ============================================= */
.page-about {
  --page-accent: #6a4e9c;
  --page-accent-soft: rgba(106, 78, 156, 0.15);
  --page-gold: #f5d76e;
  --page-gold-soft: rgba(245, 215, 110, 0.12);
  --page-divider: #2a3d5c;
  --page-card-bg: #1b2a3f;
  --page-text-muted: #9aa8b9;
  --page-glow-color: rgba(106, 78, 156, 0.25);
  --page-timeline-bar: #2a3d5c;
  --page-timeline-dot-size: 14px;
  --page-timeline-line-width: 2px;

  color: var(--color-cold-white);
  background: transparent;
  position: relative;
  z-index: 1;
}

/* ===== 面包屑 ===== */
.page-about .breadcrumb {
  padding-top: calc(var(--nav-height) + 24px);
  padding-bottom: 8px;
  font-size: var(--caption-size);
  color: var(--color-text-muted);
}
.page-about .breadcrumb__link {
  color: var(--color-text-muted);
  text-decoration: none;
  transition: color var(--transition-smooth);
}
.page-about .breadcrumb__link:hover,
.page-about .breadcrumb__link:focus-visible {
  color: var(--color-bright-white);
}
.page-about .breadcrumb__sep {
  margin: 0 8px;
  color: var(--color-border);
}
.page-about .breadcrumb__current {
  color: var(--color-cold-white);
  font-weight: 400;
}

/* ===== 品牌故事 Hero ===== */
.page-about__hero {
  padding-top: 32px;
  padding-bottom: 64px;
}
.page-about__hero-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
.page-about__hero-text {
  order: 1;
}
.page-about__hero-title {
  font-family: var(--font-heading);
  font-size: var(--heading-size);
  font-weight: 700;
  line-height: 1.15;
  color: var(--color-bright-white);
  margin: 0 0 20px 0;
  letter-spacing: 0.02em;
}
.page-about__hero-subtitle {
  font-size: 1.15rem;
  line-height: 1.6;
  color: var(--color-cold-white);
  margin: 0 0 16px 0;
  max-width: 640px;
}
.page-about__hero-desc {
  font-size: var(--body-size);
  line-height: 1.7;
  color: var(--page-text-muted);
  margin: 0 0 24px 0;
  max-width: 600px;
}
.page-about__hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}
.page-about__hero-meta-item {
  display: inline-block;
  padding: 6px 16px;
  border: 1px solid var(--page-divider);
  border-radius: 999px;
  font-size: var(--caption-size);
  color: var(--page-text-muted);
  letter-spacing: 0.04em;
  background: rgba(26, 42, 68, 0.4);
  backdrop-filter: blur(4px);
}
.page-about__hero-visual {
  position: relative;
  order: 0;
}
.page-about__hero-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  object-fit: cover;
  aspect-ratio: 800 / 600;
  position: relative;
  z-index: 1;
}
.page-about__hero-glow {
  position: absolute;
  top: -20px;
  right: -20px;
  width: 180px;
  height: 180px;
  border-radius: 50%;
  background: radial-gradient(circle, var(--page-glow-color) 0%, transparent 70%);
  z-index: 0;
  pointer-events: none;
}

/* ===== 时间线 ===== */
.page-about__timeline {
  padding-top: 48px;
  padding-bottom: 64px;
  position: relative;
}
.page-about__section-title {
  margin-bottom: 40px;
}
.page-about__timeline-track {
  position: relative;
  padding-left: 28px;
}
.page-about__timeline-track::before {
  content: '';
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: var(--page-timeline-line-width);
  background: var(--page-timeline-bar);
  border-radius: 2px;
}
.page-about__timeline-item {
  position: relative;
  padding-bottom: 36px;
}
.page-about__timeline-item:last-child {
  padding-bottom: 0;
}
.page-about__timeline-dot {
  position: absolute;
  left: -22px;
  top: 6px;
  width: var(--page-timeline-dot-size);
  height: var(--page-timeline-dot-size);
  border-radius: 50%;
  background: var(--page-accent);
  border: 3px solid var(--color-deep-blue);
  box-shadow: 0 0 0 2px var(--page-accent), 0 0 16px rgba(106, 78, 156, 0.3);
  z-index: 1;
  transition: transform var(--transition-smooth), box-shadow var(--transition-smooth);
}
.page-about__timeline-item:hover .page-about__timeline-dot {
  transform: scale(1.3);
  box-shadow: 0 0 0 3px var(--page-accent), 0 0 28px rgba(106, 78, 156, 0.5);
}
.page-about__timeline-content {
  background: var(--page-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 16px 20px;
  transition: border-color var(--transition-smooth), box-shadow var(--transition-smooth);
}
.page-about__timeline-item:hover .page-about__timeline-content {
  border-color: var(--page-accent);
  box-shadow: 0 4px 20px rgba(106, 78, 156, 0.12);
}
.page-about__timeline-phase {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 600;
  color: var(--color-bright-white);
  margin: 0 0 6px 0;
  letter-spacing: 0.06em;
}
.page-about__timeline-content p {
  font-size: var(--body-size);
  line-height: 1.6;
  color: var(--page-text-muted);
  margin: 0;
}

/* ===== 服务理念 ===== */
.page-about__philosophy {
  padding-top: 48px;
  padding-bottom: 64px;
}
.page-about__philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}
.page-about__philosophy-text {
  order: 1;
}
.page-about__philosophy-desc {
  font-size: var(--body-size);
  line-height: 1.7;
  color: var(--color-cold-white);
  margin: 0 0 28px 0;
  max-width: 600px;
}
.page-about__philosophy-list {
  list-style: none;
  padding: 0;
  margin: 0 0 32px 0;
  display: flex;
  flex-direction: column;
  gap: 14px;
}
.page-about__philosophy-item {
  display: flex;
  align-items: flex-start;
  gap: 12px;
  font-size: var(--body-size);
  line-height: 1.5;
  color: var(--color-cold-white);
}
.page-about__philosophy-icon {
  flex-shrink: 0;
  width: 22px;
  height: 22px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--page-gold);
  font-size: 1rem;
  margin-top: 2px;
}
.page-about__philosophy-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}
.page-about__philosophy-visual {
  position: relative;
  order: 0;
}
.page-about__philosophy-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  object-fit: cover;
  aspect-ratio: 400 / 300;
}
.page-about__philosophy-gridlines {
  position: absolute;
  top: -12px;
  left: -12px;
  width: calc(100% + 24px);
  height: calc(100% + 24px);
  background-image:
    linear-gradient(to right, var(--page-divider) 1px, transparent 1px),
    linear-gradient(to bottom, var(--page-divider) 1px, transparent 1px);
  background-size: 40px 40px;
  opacity: 0.25;
  z-index: 0;
  pointer-events: none;
  border-radius: var(--radius-sm);
}

/* ===== 运营主体 ===== */
.page-about__entity {
  padding-top: 48px;
  padding-bottom: 64px;
}
.page-about__entity-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: start;
}
.page-about__entity-visual {
  position: relative;
  order: 0;
}
.page-about__entity-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  display: block;
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-card);
  object-fit: cover;
  aspect-ratio: 600 / 400;
}
.page-about__entity-overlay {
  position: absolute;
  bottom: 12px;
  left: 12px;
  padding: 8px 16px;
  background: rgba(5, 11, 20, 0.7);
  backdrop-filter: blur(6px);
  border-radius: 6px;
  font-size: var(--caption-size);
  color: var(--color-cold-white);
  border: 1px solid var(--page-divider);
  letter-spacing: 0.04em;
}
.page-about__entity-text {
  order: 1;
}
.page-about__entity-card {
  background: var(--page-card-bg);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  padding: 20px 24px;
  margin-bottom: 24px;
  display: flex;
  flex-direction: column;
  gap: 0;
}
.page-about__entity-row {
  display: flex;
  flex-direction: column;
  padding: 12px 0;
  border-bottom: 1px solid var(--color-border);
  gap: 4px;
}
.page-about__entity-row:last-child {
  border-bottom: none;
}
.page-about__entity-row--note .page-about__entity-value {
  font-size: var(--caption-size);
  color: var(--page-text-muted);
  font-style: italic;
}
.page-about__entity-label {
  font-size: var(--caption-size);
  font-weight: 600;
  color: var(--page-accent);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.page-about__entity-value {
  font-size: var(--body-size);
  color: var(--color-cold-white);
  word-break: break-word;
}
.page-about__entity-cta {
  display: inline-flex;
  align-items: center;
  gap: 8px;
}

/* ===== 品牌承诺条 ===== */
.page-about__trust {
  padding-top: 32px;
  padding-bottom: 80px;
  text-align: center;
}
.page-about__trust-quote {
  margin: 0;
  padding: 32px 24px;
  border: 1px solid var(--page-divider);
  border-radius: var(--radius-md);
  background: rgba(27, 42, 63, 0.4);
  backdrop-filter: blur(6px);
  position: relative;
}
.page-about__trust-quote::before {
  content: '\201C';
  display: block;
  font-size: 3.5rem;
  line-height: 1;
  color: var(--page-accent);
  opacity: 0.4;
  margin-bottom: -12px;
  text-align: left;
}
.page-about__trust-quote p {
  font-size: 1.1rem;
  line-height: 1.7;
  color: var(--color-cold-white);
  margin: 0 0 16px 0;
  max-width: 700px;
  margin-left: auto;
  margin-right: auto;
}
.page-about__trust-source {
  font-size: var(--caption-size);
  color: var(--page-text-muted);
  letter-spacing: 0.06em;
}

/* ===== 工具类 ===== */
.page-about .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border: 0;
}

/* ===== 响应式 - 桌面端 ===== */
@media (min-width: 768px) {
  .page-about__hero-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
  .page-about__hero-text {
    order: 0;
  }
  .page-about__hero-visual {
    order: 1;
  }
  .page-about__hero-title {
    font-size: clamp(2.4rem, 4.5vw, 4rem);
  }

  .page-about__timeline-track {
    padding-left: 0;
    max-width: 720px;
    margin: 0 auto;
  }
  .page-about__timeline-track::before {
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about__timeline-item {
    display: flex;
    align-items: flex-start;
    padding-bottom: 40px;
  }
  .page-about__timeline-item:nth-child(odd) {
    flex-direction: row;
    justify-content: flex-start;
  }
  .page-about__timeline-item:nth-child(even) {
    flex-direction: row;
    justify-content: flex-end;
  }
  .page-about__timeline-dot {
    position: absolute;
    left: 50%;
    top: 8px;
    transform: translateX(-50%);
    z-index: 2;
  }
  .page-about__timeline-item:nth-child(odd) .page-about__timeline-content {
    margin-right: auto;
    max-width: 44%;
  }
  .page-about__timeline-item:nth-child(even) .page-about__timeline-content {
    margin-left: auto;
    max-width: 44%;
  }
  .page-about__timeline-content {
    padding: 18px 24px;
  }

  .page-about__philosophy-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
  .page-about__philosophy-text {
    order: 0;
  }
  .page-about__philosophy-visual {
    order: 1;
  }

  .page-about__entity-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }
  .page-about__entity-visual {
    order: 0;
  }
  .page-about__entity-text {
    order: 1;
  }
  .page-about__entity-row {
    flex-direction: row;
    align-items: baseline;
    gap: 16px;
  }
  .page-about__entity-label {
    min-width: 100px;
    flex-shrink: 0;
  }

  .page-about__trust-quote {
    padding: 40px 48px;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    padding-top: 48px;
    padding-bottom: 80px;
  }
  .page-about__timeline {
    padding-top: 64px;
    padding-bottom: 80px;
  }
  .page-about__philosophy {
    padding-top: 64px;
    padding-bottom: 80px;
  }
  .page-about__entity {
    padding-top: 64px;
    padding-bottom: 80px;
  }
  .page-about__trust {
    padding-bottom: 100px;
  }
}

/* 防止横向溢出 */
.page-about img {
  max-width: 100%;
  height: auto;
}
.page-about .container {
  max-width: var(--content-max-width);
  margin-left: auto;
  margin-right: auto;
  padding-left: 20px;
  padding-right: 20px;
}
@media (min-width: 768px) {
  .page-about .container {
    padding-left: 32px;
    padding-right: 32px;
  }
}