/* ===== 品牌故事页面专属样式 ===== */
.page-about {
  --about-bg-left: #14142a;
  --about-bg-right: #1a1a30;
  --about-accent: #E63946;
  --about-blue: #00B4D8;
  --about-silver: #C0C0C0;
  --about-muted: #9CA3AF;
  --about-text: #E0E0E0;
  --about-white: #FFFFFF;
  --about-border: #2E2E4A;
  --about-tooltip-bg: #0f0f22;
  --about-transition: 0.3s ease-out;
  --about-font-heading: 'Inter', 'Poppins', system-ui, sans-serif;
  --about-font-body: 'Inter', system-ui, sans-serif;
}

/* ---- 面包屑 ---- */
.page-about .breadcrumb {
  max-width: 1200px;
  margin: 0 auto 1.5rem auto;
  padding: 1rem var(--spacing-md, 1rem) 0 var(--spacing-md, 1rem);
  font-size: 0.85rem;
  color: var(--about-muted);
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0.4rem;
}

.page-about .breadcrumb a {
  color: var(--about-blue);
  text-decoration: none;
  transition: color var(--about-transition);
}

.page-about .breadcrumb a:hover {
  color: var(--about-white);
}

.page-about .breadcrumb-sep {
  color: var(--about-border);
  user-select: none;
}

.page-about .breadcrumb [aria-current="page"] {
  color: var(--about-silver);
}

/* ---- 左右分屏容器 ---- */
.page-about .about-split {
  display: flex;
  flex-direction: column;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--spacing-md, 1rem) var(--spacing-xl, 4rem);
  gap: 2rem;
}

/* ---- 左屏 ---- */
.page-about .about-left {
  flex: 1 1 100%;
  background: var(--about-bg-left);
  padding: 2rem 1.5rem;
  border-radius: 0;
  position: relative;
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 1.2rem), calc(100% - 1.2rem) 100%, 0 100%);
}

/* ---- 右屏 ---- */
.page-about .about-right {
  flex: 1 1 100%;
  background: var(--about-bg-right);
  padding: 2rem 1.5rem;
  border-radius: 0;
  position: relative;
  border-left: 2px solid var(--about-blue);
}

/* ---- 通用段落样式 ---- */
.page-about .about-section {
  margin-bottom: 3rem;
}

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

/* ---- 01 品牌起源 ---- */
.page-about .origin-section .section-label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--about-blue);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--about-blue);
  margin-bottom: 0.8rem;
}

.page-about .origin-title {
  font-family: var(--about-font-heading);
  font-size: 2.2rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--about-white);
  margin: 0 0 1rem 0;
  line-height: 1.15;
}

.page-about .origin-desc {
  font-family: var(--about-font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--about-text);
  margin: 0 0 1.5rem 0;
  max-width: 580px;
}

.page-about .origin-visual {
  margin: 0 0 1.5rem 0;
}

.page-about .origin-img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-border);
}

.page-about .origin-cta {
  font-family: var(--about-font-body);
  font-size: 0.95rem;
  color: var(--about-muted);
  margin: 0;
}

.page-about .inline-link {
  color: var(--about-blue);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color var(--about-transition), color var(--about-transition);
}

.page-about .inline-link:hover {
  color: var(--about-white);
  border-bottom-color: var(--about-blue);
}

/* ---- 02 时间线 ---- */
.page-about .timeline-section .section-label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--about-blue);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--about-blue);
  margin-bottom: 0.8rem;
}

.page-about .timeline-heading {
  font-family: var(--about-font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--about-white);
  margin: 0 0 0.5rem 0;
}

.page-about .timeline-intro {
  font-family: var(--about-font-body);
  font-size: 0.9rem;
  color: var(--about-muted);
  margin: 0 0 1.8rem 0;
}

.page-about .timeline-track {
  position: relative;
  padding-left: 2.2rem;
  margin: 0 0 1.5rem 0;
}

.page-about .timeline-track::before {
  content: '';
  position: absolute;
  left: 0.7rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-blue), var(--about-accent));
  border-radius: 1px;
}

/* 时间线节点 - 默认状态显示简要 */
.page-about .tl-node {
  position: relative;
  margin-bottom: 2rem;
  cursor: default;
  transition: opacity var(--about-transition);
}

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

.page-about .tl-marker {
  position: absolute;
  left: -1.6rem;
  top: 0.3rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--about-blue);
  border: 2px solid var(--about-bg-left);
  box-shadow: 0 0 0 2px var(--about-blue);
  transition: transform var(--about-transition), background var(--about-transition);
  z-index: 1;
}

.page-about .tl-node:hover .tl-marker {
  transform: scale(1.3);
  background: var(--about-accent);
  box-shadow: 0 0 0 2px var(--about-accent);
}

.page-about .tl-content {
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
}

.page-about .tl-badge {
  font-family: var(--about-font-heading);
  font-size: 0.8rem;
  font-weight: 600;
  color: var(--about-accent);
  letter-spacing: 0.02em;
}

.page-about .tl-label {
  font-family: var(--about-font-body);
  font-size: 1rem;
  color: var(--about-silver);
  line-height: 1.4;
}

/* tooltip 悬停详情 */
.page-about .tl-node {
  position: relative;
}

.page-about .tl-node::after {
  content: attr(data-tooltip);
  position: absolute;
  left: 0;
  top: calc(100% + 0.5rem);
  background: var(--about-tooltip-bg);
  color: var(--about-text);
  font-size: 0.8rem;
  line-height: 1.4;
  padding: 0.6rem 1rem;
  border: 1px solid var(--about-blue);
  border-radius: 0;
  white-space: normal;
  max-width: 260px;
  width: max-content;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--about-transition), transform var(--about-transition);
  transform: translateY(4px);
  z-index: 10;
}

.page-about .tl-node:hover::after {
  opacity: 1;
  transform: translateY(0);
}

.page-about .timeline-footnote {
  font-family: var(--about-font-body);
  font-size: 0.85rem;
  color: var(--about-muted);
  margin: 0;
  padding-top: 0.5rem;
  border-top: 1px solid var(--about-border);
}

/* ---- 03 核心数据 ---- */
.page-about .data-section .section-label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--about-blue);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--about-blue);
  margin-bottom: 1.2rem;
}

.page-about .data-hero {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  margin-bottom: 1.5rem;
}

.page-about .core-number {
  font-family: var(--about-font-heading);
  font-size: 4.5rem;
  font-weight: 800;
  line-height: 1;
  color: var(--about-accent);
  letter-spacing: -0.04em;
  animation: aboutFadeScale 0.8s ease-out 0.2s both;
  text-shadow: 0 0 20px rgba(230, 57, 70, 0.25);
}

.page-about .core-unit {
  font-family: var(--about-font-heading);
  font-size: 0.9rem;
  font-weight: 400;
  color: var(--about-silver);
  line-height: 1.3;
  letter-spacing: 0.02em;
}

/* 柱状图 */
.page-about .chart-wrap {
  display: flex;
  flex-wrap: wrap;
  gap: 1.2rem;
  margin-bottom: 1rem;
  align-items: flex-end;
}

.page-about .chart-bars {
  display: flex;
  align-items: flex-end;
  gap: 0.6rem;
  flex: 1 1 160px;
  min-height: 120px;
}

.page-about .chart-bar {
  flex: 1;
  height: var(--bar-h, 30%);
  min-height: 8px;
  background: linear-gradient(to top, var(--about-blue), #4cc9f0);
  position: relative;
  animation: aboutBarGrow 0.8s ease-out both;
  transform-origin: bottom;
  border-radius: 0 0 0 0;
}

.page-about .chart-bar:nth-child(1) { animation-delay: 0.3s; }
.page-about .chart-bar:nth-child(2) { animation-delay: 0.45s; }
.page-about .chart-bar:nth-child(3) { animation-delay: 0.6s; }

.page-about .chart-bar::after {
  content: attr(data-bar-label);
  position: absolute;
  bottom: -1.4rem;
  left: 50%;
  transform: translateX(-50%);
  font-family: var(--about-font-body);
  font-size: 0.65rem;
  color: var(--about-muted);
  white-space: nowrap;
}

.page-about .chart-img {
  flex: 0 0 auto;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-border);
}

.page-about .data-note {
  font-family: var(--about-font-body);
  font-size: 0.85rem;
  color: var(--about-muted);
  margin: 0.5rem 0 0 0;
}

/* ---- 04 核心技术方向 ---- */
.page-about .tech-section .section-label {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  color: var(--about-blue);
  padding: 0.2rem 0.6rem;
  border: 1px solid var(--about-blue);
  margin-bottom: 0.8rem;
}

.page-about .tech-heading {
  font-family: var(--about-font-heading);
  font-size: 1.6rem;
  font-weight: 700;
  letter-spacing: -0.02em;
  color: var(--about-white);
  margin: 0 0 1.2rem 0;
}

.page-about .tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 0.8rem;
  margin-bottom: 1.5rem;
}

.page-about .tech-card {
  background: rgba(0, 180, 216, 0.04);
  border: 1px solid var(--about-border);
  padding: 1rem 1.2rem;
  transition: border-color var(--about-transition), background var(--about-transition);
  cursor: default;
}

.page-about .tech-card:hover {
  border-color: var(--about-blue);
  background: rgba(0, 180, 216, 0.08);
}

.page-about .tech-card-num {
  display: inline-block;
  font-family: var(--about-font-heading);
  font-size: 0.7rem;
  font-weight: 700;
  color: var(--about-blue);
  letter-spacing: 0.05em;
  margin-bottom: 0.3rem;
  border: 1px solid var(--about-blue);
  padding: 0.05rem 0.4rem;
}

.page-about .tech-card-title {
  font-family: var(--about-font-heading);
  font-size: 1rem;
  font-weight: 600;
  color: var(--about-white);
  margin: 0 0 0.3rem 0;
  letter-spacing: -0.01em;
}

.page-about .tech-card-desc {
  font-family: var(--about-font-body);
  font-size: 0.85rem;
  line-height: 1.5;
  color: var(--about-text);
  margin: 0;
}

.page-about .tech-visual {
  margin: 0 0 1.2rem 0;
}

.page-about .tech-img {
  display: block;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--about-border);
}

.page-about .tech-more {
  font-family: var(--about-font-body);
  font-size: 0.9rem;
  color: var(--about-muted);
  margin: 0;
}

/* ---- keyframes ---- */
@keyframes aboutFadeScale {
  0% {
    opacity: 0;
    transform: scale(0.6);
  }
  100% {
    opacity: 1;
    transform: scale(1);
  }
}

@keyframes aboutBarGrow {
  0% {
    transform: scaleY(0);
  }
  100% {
    transform: scaleY(1);
  }
}

/* ===== 桌面端（≥768px） ===== */
@media (min-width: 768px) {
  .page-about .about-split {
    flex-direction: row;
    gap: 0;
    padding: 0 var(--spacing-lg, 2rem) var(--spacing-xl, 4rem);
  }

  .page-about .about-left {
    flex: 0 0 58%;
    padding: 2.5rem 2.5rem 3rem 2rem;
    clip-path: polygon(0 0, 100% 0, 100% calc(100% - 2rem), calc(100% - 2rem) 100%, 0 100%);
  }

  .page-about .about-right {
    flex: 0 0 38%;
    padding: 2.5rem 2rem 3rem 2.5rem;
    margin-left: -1px;
    border-left: 2px solid var(--about-blue);
  }

  .page-about .origin-title {
    font-size: 3rem;
  }

  .page-about .core-number {
    font-size: 6rem;
  }

  .page-about .chart-bars {
    min-height: 160px;
  }

  .page-about .tech-grid {
    grid-template-columns: 1fr;
  }

  .page-about .timeline-track {
    padding-left: 2.5rem;
  }

  .page-about .tl-node::after {
    max-width: 300px;
    left: 1rem;
  }
}

/* ===== 大桌面端（≥1024px） ===== */
@media (min-width: 1024px) {
  .page-about .about-left {
    flex: 0 0 60%;
    padding: 3rem 3rem 3.5rem 2.5rem;
  }

  .page-about .about-right {
    flex: 0 0 36%;
    padding: 3rem 2.5rem 3.5rem 3rem;
  }

  .page-about .origin-title {
    font-size: 3.6rem;
  }

  .page-about .core-number {
    font-size: 7rem;
  }

  .page-about .chart-wrap {
    flex-wrap: nowrap;
  }

  .page-about .tech-grid {
    grid-template-columns: 1fr;
  }
}

.page-about {
  --bar-h: 1rem;
}