.page-about {
  --milestone-marker-width: 56px;
  --milestone-line-start: rgba(0, 212, 255, 0.35);
  --milestone-line-end: rgba(0, 212, 255, 0.08);
  --card-soft-bg: rgba(42, 47, 58, 0.55);
  --grid-line: rgba(0, 212, 255, 0.04);
  background-color: var(--bg-deep);
  color: var(--text);
}

/* ========== 面包屑 ========== */
.page-about .breadcrumb {
  padding-top: calc(var(--header-height) + var(--space-4));
  padding-bottom: 0;
  font-size: 0.875rem;
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  color: rgba(245, 240, 230, 0.6);
}

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

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

.page-about .breadcrumb-sep {
  color: rgba(245, 240, 230, 0.35);
}

/* ========== 首屏标题区 ========== */
.page-about .about-hero {
  position: relative;
  margin-top: var(--space-5);
  padding: var(--space-5) var(--space-4);
  background: linear-gradient(120deg, rgba(0, 212, 255, 0.07) 0%, transparent 55%), var(--bg-elev);
  border-left: 4px solid var(--accent);
  clip-path: polygon(0 0, 100% 0, calc(100% - 24px) 100%, 0 100%);
}

.page-about .about-hero .kicker {
  margin-bottom: var(--space-3);
}

.page-about .about-hero h1 {
  font-size: clamp(2rem, 6vw, 3.5rem);
  font-weight: 900;
  line-height: 1.05;
  letter-spacing: -0.02em;
  text-transform: uppercase;
  margin-bottom: var(--space-4);
}

@supports (-webkit-background-clip: text) or (background-clip: text) {
  .page-about .about-hero h1 {
    background: linear-gradient(120deg, var(--text) 30%, var(--accent) 100%);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
  }
}

.page-about .about-hero .lead {
  max-width: 58ch;
  margin-bottom: var(--space-4);
  color: rgba(245, 240, 230, 0.85);
}

.page-about .about-hero-badges {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

/* ========== 品牌故事 / 合规 / 团队 通用段落 ========== */
.page-about .about-story h2,
.page-about .about-compliance h2,
.page-about .about-culture h2,
.page-about .about-milestones h2,
.page-about .about-next h2 {
  margin-top: var(--space-2);
  margin-bottom: var(--space-4);
  font-size: clamp(1.5rem, 3vw, 2.25rem);
  font-weight: 800;
  line-height: 1.2;
}

.page-about .about-story p,
.page-about .about-compliance p,
.page-about .about-culture p {
  margin-bottom: var(--space-3);
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.88);
}

.page-about .about-story .btn {
  margin-top: var(--space-2);
}

/* 移动端默认：单列网格 */
.page-about .about-story-grid,
.page-about .about-compliance-grid,
.page-about .about-culture-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--space-4);
  align-items: center;
}

.page-about .col-6 {
  min-width: 0;
}

/* ========== 图片 ========== */
.page-about .about-story-image,
.page-about .about-compliance-image,
.page-about .about-culture-image {
  margin-top: var(--space-4);
}

.page-about .image-frame img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius);
  border: 1px solid rgba(245, 240, 230, 0.1);
}

.page-about .about-story-image img {
  clip-path: polygon(0 0, 100% 0, calc(100% - 20px) 100%, 0 100%);
}

.page-about .about-compliance-image img {
  clip-path: polygon(0 0, calc(100% - 20px) 0, 100% 100%, 0 100%);
}

/* ========== 发展里程碑 ========== */
.page-about .about-milestones {
  position: relative;
  padding-top: var(--space-6);
}

.page-about .about-milestones::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background-image: linear-gradient(var(--grid-line) 1px, transparent 1px), linear-gradient(90deg, var(--grid-line) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about .about-milestones .container {
  position: relative;
  z-index: 1;
}

.page-about .section-head {
  margin-bottom: var(--space-5);
}

.page-about .section-head .lead {
  max-width: 48ch;
  margin-top: var(--space-2);
  color: rgba(245, 240, 230, 0.7);
}

.page-about .milestone-timeline {
  display: grid;
  gap: var(--space-4);
}

.page-about .milestone-card {
  display: grid;
  grid-template-columns: var(--milestone-marker-width) 1fr;
  gap: var(--space-4);
  align-items: start;
  padding: var(--space-4);
  background: rgba(42, 47, 58, 0.7);
  border: 1px solid rgba(245, 240, 230, 0.08);
  border-radius: var(--radius);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about .milestone-card:hover {
  background: rgba(42, 47, 58, 0.9);
  border-color: var(--accent);
  box-shadow: 0 0 28px rgba(0, 212, 255, 0.12);
}

.page-about .milestone-marker {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: var(--space-2);
  height: 100%;
  position: relative;
}

.page-about .milestone-node {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
  border-radius: 50%;
  background: var(--bg-deep);
  border: 3px solid var(--accent);
  transition: background var(--transition), border-color var(--transition), box-shadow var(--transition);
}

.page-about .milestone-card:hover .milestone-node {
  background: var(--accent);
  box-shadow: 0 0 16px rgba(0, 212, 255, 0.5);
}

.page-about .milestone-marker::after {
  content: "";
  width: 2px;
  flex: 1;
  min-height: var(--space-4);
  background: linear-gradient(180deg, var(--milestone-line-start) 0%, var(--milestone-line-end) 100%);
}

.page-about .milestone-card:last-child .milestone-marker::after {
  background: linear-gradient(180deg, var(--milestone-line-start) 0%, transparent 100%);
}

.page-about .milestone-version {
  font-size: 1.25rem;
  font-weight: 800;
  color: var(--accent);
  border: 1px solid rgba(0, 212, 255, 0.35);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius);
  background: rgba(0, 212, 255, 0.08);
  transition: background var(--transition), border-color var(--transition);
}

.page-about .milestone-card:hover .milestone-version {
  background: rgba(0, 212, 255, 0.15);
  border-color: var(--accent);
}

.page-about .milestone-phase {
  font-size: 0.75rem;
  color: rgba(245, 240, 230, 0.55);
  letter-spacing: 0.08em;
  text-transform: uppercase;
}

.page-about .milestone-content h3 {
  margin-bottom: var(--space-2);
  font-size: 1.125rem;
  font-weight: 700;
}

.page-about .milestone-content p {
  font-size: 0.9375rem;
  line-height: 1.7;
  color: rgba(245, 240, 230, 0.8);
}

/* ========== 合规与资质 ========== */
.page-about .about-compliance {
  padding-top: var(--space-6);
}

.page-about .compliance-list {
  list-style: none;
  margin: var(--space-4) 0 0;
  padding: 0;
  display: grid;
  gap: var(--space-3);
}

.page-about .compliance-list li {
  display: flex;
  align-items: stretch;
  gap: var(--space-3);
  padding: var(--space-3);
  background: var(--card-soft-bg);
  border: 1px solid rgba(245, 240, 230, 0.06);
  border-left: 3px solid var(--accent);
  transition: background var(--transition), border-color var(--transition);
}

.page-about .compliance-list li:hover {
  background: rgba(42, 47, 58, 0.8);
  border-left-color: var(--acid);
}

.page-about .compliance-icon {
  flex-shrink: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  font-family: var(--font-data);
  font-size: 0.75rem;
  font-weight: 700;
  color: var(--accent);
  background: rgba(0, 212, 255, 0.1);
  border: 1px solid rgba(0, 212, 255, 0.3);
  border-radius: var(--radius);
}

.page-about .compliance-item-text {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.page-about .compliance-item-text strong {
  font-size: 0.9375rem;
  color: var(--text);
}

.page-about .compliance-item-text .data-number,
.page-about .compliance-item-text span {
  font-size: 0.875rem;
  color: rgba(245, 240, 230, 0.7);
}

/* ========== 团队与文化 ========== */
.page-about .about-culture {
  padding-top: var(--space-6);
}

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

/* ========== 延伸阅读 ========== */
.page-about .about-next {
  padding-top: var(--space-6);
  padding-bottom: var(--space-6);
}

.page-about .about-next-panel {
  padding: var(--space-5) var(--space-4);
  background: linear-gradient(135deg, rgba(0, 212, 255, 0.06) 0%, transparent 50%), var(--bg-elev);
  border: 1px solid rgba(0, 212, 255, 0.15);
  border-radius: var(--radius);
}

.page-about .about-next-panel h2 {
  margin-bottom: var(--space-3);
}

.page-about .about-next-panel p {
  max-width: 48ch;
  color: rgba(245, 240, 230, 0.8);
}

.page-about .about-next-links {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-3);
  margin-top: var(--space-4);
}

/* ========== 桌面端增强 ========== */
@media (min-width: 960px) {
  .page-about .about-hero {
    margin-top: var(--space-5);
    padding: var(--space-6);
    clip-path: polygon(0 0, 100% 0, calc(100% - 48px) 100%, 0 100%);
  }

  .page-about .about-hero h1 {
    font-size: clamp(2.5rem, 5vw, 3.5rem);
  }

  .page-about .about-hero .lead {
    font-size: 1.125rem;
  }

  .page-about .about-story-grid,
  .page-about .about-compliance-grid,
  .page-about .about-culture-grid {
    grid-template-columns: 1fr 1fr;
    gap: var(--space-5);
  }

  .page-about .about-story-image,
  .page-about .about-compliance-image,
  .page-about .about-culture-image {
    margin-top: 0;
  }

  .page-about .about-story {
    padding-top: var(--space-6);
  }

  .page-about .milestone-card {
    grid-template-columns: 72px 1fr;
    gap: var(--space-5);
    padding: var(--space-5);
  }

  .page-about .milestone-marker {
    gap: var(--space-3);
  }

  .page-about .about-next-panel {
    padding: var(--space-6);
  }
}