/* ===== 页面专属：品牌故事 .page-about ===== */
.page-about {
  --about-hero-bg: linear-gradient(135deg, var(--color-primary) 0%, #071f33 100%);
  --about-accent-glow: rgba(255, 111, 0, 0.15);
  --about-tl-line: var(--color-primary-dark);
  --about-card-shadow: 0 8px 32px rgba(10, 61, 98, 0.10);
  --about-transition: var(--transition-med);

  display: flex;
  flex-direction: column;
  gap: 0;
  background-color: var(--color-white);
  color: var(--color-black);
  font-family: var(--font-body);
  line-height: var(--line-height-body);
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0.75rem 1.25rem;
  font-size: var(--size-small);
  color: var(--color-gray-text);
  display: flex;
  align-items: center;
  gap: 0.5rem;
  width: 100%;
  box-sizing: border-box;
}
.page-about .breadcrumb a {
  color: var(--color-accent);
  text-decoration: none;
  transition: color var(--transition-fast);
}
.page-about .breadcrumb a:hover {
  color: var(--color-accent-light);
}
.page-about .breadcrumb-sep {
  color: var(--color-silver);
  user-select: none;
}

/* ---------- Hero 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  background: var(--about-hero-bg);
  padding: 3rem 1.25rem 4rem;
  overflow: hidden;
  display: flex;
  align-items: center;
  justify-content: center;
  min-height: clamp(320px, 55vh, 520px);
}
.page-about .about-hero-bg {
  position: absolute;
  inset: 0;
  background: radial-gradient(ellipse at 20% 80%, rgba(0, 191, 165, 0.12) 0%, transparent 60%),
              radial-gradient(ellipse at 80% 20%, rgba(255, 111, 0, 0.08) 0%, transparent 50%);
  pointer-events: none;
}
.page-about .hero-slant {
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 80px;
  background: var(--color-white);
  clip-path: polygon(0 100%, 100% 100%, 100% 0, 0 100%);
  opacity: 0.92;
}
.page-about .hero-inner {
  position: relative;
  z-index: 2;
  text-align: center;
  max-width: 820px;
  margin: 0 auto;
}
.page-about .hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.4rem, 9vw, 4.2rem);
  font-weight: 800;
  font-style: italic;
  letter-spacing: var(--letter-spacing-heading);
  line-height: 1.08;
  color: var(--color-white);
  margin: 0 0 0.75rem;
  text-shadow: 0 4px 32px rgba(0,0,0,0.30);
}
.page-about .hero-sub {
  font-size: clamp(1rem, 2.5vw, 1.35rem);
  color: var(--color-silver);
  margin: 0 0 1.5rem;
  font-weight: 400;
  letter-spacing: 0.02em;
}
.page-about .hero-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  justify-content: center;
}
.page-about .hero-meta .badge {
  background: rgba(255,255,255,0.12);
  color: var(--color-white);
  border: 1px solid rgba(255,255,255,0.20);
  backdrop-filter: blur(4px);
  font-size: var(--size-small);
  padding: 0.3rem 1rem;
  border-radius: var(--radius-capsule);
  letter-spacing: 0.03em;
}

/* ---------- 页面锚点导航 ---------- */
.page-about .page-anchors {
  display: flex;
  justify-content: center;
  gap: 1rem 2.5rem;
  padding: 1.25rem 1rem;
  background: var(--color-light-bg);
  border-bottom: 1px solid var(--color-silver);
  flex-wrap: wrap;
}
.page-about .anchor-link {
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--size-body);
  color: var(--color-primary);
  text-decoration: none;
  padding: 0.25rem 0.5rem;
  border-bottom: 2px solid transparent;
  transition: border-color var(--transition-fast), color var(--transition-fast);
  letter-spacing: 0.01em;
}
.page-about .anchor-link:hover,
.page-about .anchor-link:focus {
  border-bottom-color: var(--color-accent);
  color: var(--color-accent);
}

/* ---------- 通用容器 ---------- */
.page-about .container {
  max-width: var(--max-width);
  margin: 0 auto;
  padding: 0 1.25rem;
  box-sizing: border-box;
  width: 100%;
}

/* ---------- 章节标题 ---------- */
.page-about .section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.6rem, 4.5vw, var(--size-h2));
  font-weight: 700;
  font-style: italic;
  letter-spacing: var(--letter-spacing-heading);
  color: var(--color-primary);
  margin: 0 0 1.75rem;
  padding-bottom: 0.5rem;
  border-bottom: 4px solid var(--color-accent);
  display: inline-block;
  position: relative;
}

/* ===== 品牌理念 ===== */
.page-about .about-philosophy {
  padding: 4rem 0 3.5rem;
  background: var(--color-white);
}
.page-about .philosophy-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 2rem;
  align-items: center;
}
@media (min-width: 720px) {
  .page-about .philosophy-grid {
    grid-template-columns: 1fr 1.2fr;
    gap: 2.5rem;
  }
}
.page-about .philosophy-image {
  order: 1;
}
.page-about .philosophy-img {
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  display: block;
}
.page-about .philosophy-text {
  order: 2;
  display: flex;
  flex-direction: column;
  gap: 1rem;
}
.page-about .philosophy-lead {
  font-size: clamp(1.05rem, 2vw, 1.25rem);
  font-weight: 600;
  color: var(--color-primary);
  line-height: 1.5;
  margin: 0;
}
.page-about .philosophy-text p {
  margin: 0;
  color: #37474F;
  font-size: var(--size-body);
}
.page-about .philosophy-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 0.5rem;
}
.page-about .philosophy-tags .badge {
  font-size: var(--size-small);
  padding: 0.3rem 1rem;
  border-radius: var(--radius-capsule);
  font-weight: 500;
}

/* ===== 发展历程 ===== */
.page-about .about-timeline {
  padding: 4rem 0 3.5rem;
  background: var(--color-light-bg);
  position: relative;
}
.page-about .timeline-wrap {
  position: relative;
  padding-left: 2.5rem;
}
.page-about .timeline-rail {
  position: absolute;
  left: 0.9rem;
  top: 0;
  bottom: 0;
  width: 3px;
  background: linear-gradient(to bottom, var(--color-primary), var(--color-accent), var(--color-data), var(--color-accent));
  border-radius: 4px;
  opacity: 0.6;
}
.page-about .timeline-items {
  display: flex;
  flex-direction: column;
  gap: 2rem;
}
.page-about .timeline-item {
  position: relative;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
}
.page-about .tl-dot {
  position: absolute;
  left: -2.5rem;
  top: 0.35rem;
  width: 1.4rem;
  height: 1.4rem;
  border-radius: 50%;
  border: 3px solid var(--color-white);
  box-shadow: 0 0 0 2px var(--color-primary), 0 2px 8px rgba(0,0,0,0.10);
  z-index: 2;
  flex-shrink: 0;
}
.page-about .tl-dot-primary { background: var(--color-primary); }
.page-about .tl-dot-accent { background: var(--color-accent); }
.page-about .tl-dot-data { background: var(--color-data); }

.page-about .tl-card {
  flex: 1;
  background: var(--color-white);
  border-radius: var(--radius-card);
  padding: 1.25rem 1.25rem 1rem;
  box-shadow: var(--about-card-shadow);
  border-left: 4px solid var(--color-primary);
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  position: relative;
}
.page-about .timeline-item:nth-child(2) .tl-card { border-left-color: var(--color-accent); }
.page-about .timeline-item:nth-child(3) .tl-card { border-left-color: var(--color-data); }
.page-about .timeline-item:nth-child(4) .tl-card { border-left-color: var(--color-accent); }

.page-about .tl-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 12px 36px rgba(10, 61, 98, 0.14);
}
.page-about .tl-card-num {
  font-family: var(--font-mono);
  font-size: 1.8rem;
  font-weight: 700;
  color: var(--color-primary);
  line-height: 1;
  margin-bottom: 0.25rem;
  opacity: 0.35;
  position: absolute;
  top: 0.6rem;
  right: 0.8rem;
}
.page-about .tl-card-title {
  font-family: var(--font-heading);
  font-size: var(--size-h3);
  font-weight: 700;
  font-style: italic;
  letter-spacing: var(--letter-spacing-heading);
  margin: 0 0 0.4rem;
  color: var(--color-black);
  padding-right: 2.5rem;
}
.page-about .tl-card-desc {
  margin: 0 0 0.75rem;
  font-size: var(--size-body);
  color: #37474F;
  line-height: 1.55;
}
.page-about .tl-card-hover {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  opacity: 0;
  max-height: 0;
  overflow: hidden;
  transition: opacity var(--about-transition), max-height var(--about-transition);
}
.page-about .tl-card:hover .tl-card-hover {
  opacity: 1;
  max-height: 80px;
}
.page-about .tl-card-hover .badge {
  font-size: 0.75rem;
  padding: 0.2rem 0.8rem;
  border-radius: var(--radius-capsule);
  background: var(--color-light-bg);
  color: var(--color-primary);
  border: 1px solid var(--color-silver);
}
.page-about .tl-card-hover .badge-accent {
  background: rgba(255, 111, 0, 0.08);
  color: var(--color-accent);
  border-color: rgba(255, 111, 0, 0.20);
}
.page-about .tl-card-hover .badge-data {
  background: rgba(0, 191, 165, 0.08);
  color: var(--color-data);
  border-color: rgba(0, 191, 165, 0.20);
}
.page-about .tl-card-hover .badge-silver {
  background: var(--color-silver);
  color: var(--color-primary-dark);
  border-color: transparent;
}

/* 时间轴脚注（手机截图） */
.page-about .timeline-footnote {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 1.5rem 2rem;
  margin-top: 2.5rem;
  padding: 1.5rem 0 0 2.5rem;
  border-top: 1px solid var(--color-silver);
}
.page-about .timeline-phone {
  width: auto;
  max-width: 140px;
  height: auto;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  object-fit: cover;
  flex-shrink: 0;
}
.page-about .footnote-text {
  margin: 0;
  font-size: var(--size-small);
  color: var(--color-gray-text);
  line-height: 1.5;
  flex: 1;
  font-style: italic;
}

/* ===== 数据价值观 ===== */
.page-about .about-values {
  padding: 4rem 0 3rem;
  background: var(--color-white);
}
.page-about .values-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}
@media (min-width: 640px) {
  .page-about .values-grid {
    grid-template-columns: 1fr 1fr;
  }
}
@media (min-width: 860px) {
  .page-about .values-grid {
    grid-template-columns: 1fr 1fr 1fr;
  }
}
.page-about .value-card {
  background: var(--color-light-bg);
  border-radius: var(--radius-card);
  padding: 1.75rem 1.5rem 1.5rem;
  box-shadow: var(--shadow-card);
  border-top: 5px solid var(--color-primary);
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
  transition: transform var(--about-transition), box-shadow var(--about-transition);
  position: relative;
}
.page-about .value-card:hover {
  transform: translateY(-6px);
  box-shadow: 0 16px 40px rgba(10, 61, 98, 0.12);
}
.page-about .value-card-accurate { border-top-color: var(--color-primary); }
.page-about .value-card-scene { border-top-color: var(--color-accent); }
.page-about .value-card-real { border-top-color: var(--color-data); }

.page-about .value-icon {
  width: 48px;
  height: 48px;
  color: var(--color-primary);
  margin-bottom: 0.25rem;
}
.page-about .value-card-accurate .value-icon { color: var(--color-primary); }
.page-about .value-card-scene .value-icon { color: var(--color-accent); }
.page-about .value-card-real .value-icon { color: var(--color-data); }

.page-about .value-title {
  font-family: var(--font-heading);
  font-size: var(--size-h3);
  font-weight: 700;
  font-style: italic;
  letter-spacing: var(--letter-spacing-heading);
  margin: 0;
  color: var(--color-black);
}
.page-about .value-desc {
  margin: 0;
  font-size: var(--size-body);
  color: #37474F;
  line-height: 1.6;
  flex: 1;
}
.page-about .value-card .badge {
  align-self: flex-start;
  font-size: var(--size-small);
  padding: 0.25rem 1rem;
  border-radius: var(--radius-capsule);
  margin-top: 0.25rem;
}

/* 价值观区底部视觉 */
.page-about .values-visual {
  margin-top: 1.5rem;
  text-align: center;
}
.page-about .values-img {
  width: 100%;
  max-width: 600px;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-card);
  box-shadow: var(--shadow-card);
  display: inline-block;
}

/* ---------- 回到顶部 ---------- */
.page-about .back-top-wrap {
  text-align: center;
  padding: 1.5rem 1.25rem 2.5rem;
  background: var(--color-white);
}
.page-about .back-top {
  display: inline-block;
  font-family: var(--font-heading);
  font-weight: 600;
  font-size: var(--size-small);
  color: var(--color-primary);
  text-decoration: none;
  padding: 0.5rem 1.5rem;
  border: 2px solid var(--color-primary);
  border-radius: var(--radius-capsule);
  transition: background var(--transition-fast), color var(--transition-fast);
}
.page-about .back-top:hover,
.page-about .back-top:focus {
  background: var(--color-primary);
  color: var(--color-white);
}

/* ===== 响应式：桌面端微调 ===== */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 4rem 2rem 5rem;
    min-height: 480px;
  }
  .page-about .hero-title {
    font-size: 4.2rem;
  }
  .page-about .timeline-wrap {
    padding-left: 3.5rem;
  }
  .page-about .timeline-rail {
    left: 1.3rem;
  }
  .page-about .tl-dot {
    left: -3.5rem;
    width: 1.6rem;
    height: 1.6rem;
  }
  .page-about .tl-card {
    padding: 1.5rem 2rem 1.25rem;
  }
  .page-about .tl-card-num {
    font-size: 2.2rem;
    top: 0.8rem;
    right: 1.2rem;
  }
  .page-about .timeline-footnote {
    flex-wrap: nowrap;
    padding-left: 3.5rem;
  }
  .page-about .timeline-phone {
    max-width: 180px;
  }
  .page-about .values-grid {
    gap: 2rem;
  }
  .page-about .value-card {
    padding: 2rem 1.75rem 1.75rem;
  }
}

/* ===== 窄屏安全 ===== */
@media (max-width: 480px) {
  .page-about .about-hero {
    padding: 2rem 1rem 3rem;
    min-height: 280px;
  }
  .page-about .hero-sub {
    font-size: 0.95rem;
  }
  .page-about .page-anchors {
    gap: 0.75rem 1.2rem;
  }
  .page-about .anchor-link {
    font-size: var(--size-small);
  }
  .page-about .timeline-wrap {
    padding-left: 1.8rem;
  }
  .page-about .timeline-rail {
    left: 0.5rem;
  }
  .page-about .tl-dot {
    left: -1.8rem;
    width: 1.1rem;
    height: 1.1rem;
  }
  .page-about .tl-card {
    padding: 1rem 1rem 0.9rem;
  }
  .page-about .tl-card-title {
    font-size: calc(var(--size-h3) * 0.85);
  }
  .page-about .tl-card-num {
    font-size: 1.4rem;
  }
  .page-about .timeline-footnote {
    padding-left: 1.8rem;
    flex-direction: column;
    align-items: flex-start;
  }
  .page-about .timeline-phone {
    max-width: 100px;
  }
}