.page-about,
.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
}

.page-about {
  --about-card-line: linear-gradient(90deg, var(--accent-gold), var(--accent-red));
  background:
    radial-gradient(1200px 500px at 92% -5%, rgba(212, 175, 55, 0.08), transparent 60%),
    radial-gradient(900px 420px at -8% 28%, rgba(192, 57, 43, 0.05), transparent 60%),
    var(--bg-primary);
  color: var(--text-primary);
  font-family: var(--font-body);
  overflow: hidden;
}

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 14px);
}

/* 面包屑 */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  align-items: center;
  padding: 18px 0 4px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

.page-about .breadcrumb a {
  color: var(--text-muted);
  text-decoration: none;
  transition: color 0.2s var(--ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--accent-gold);
}

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

/* 品牌故事英雄区 */
.page-about .about-hero {
  position: relative;
  z-index: 0;
  padding: clamp(28px, 5vw, 64px) 0 clamp(20px, 4vw, 48px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  z-index: 0;
  background-image:
    linear-gradient(rgba(212, 175, 55, 0.035) 1px, transparent 1px),
    linear-gradient(90deg, rgba(212, 175, 55, 0.035) 1px, transparent 1px);
  background-size: 56px 56px;
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(28px, 5vw, 60px);
  align-items: center;
}

.page-about .about-hero-copy {
  position: relative;
  z-index: 1;
}

.page-about .about-hero-copy::after {
  content: "四";
  position: absolute;
  right: -10px;
  bottom: -48px;
  z-index: -1;
  font-family: var(--font-heading);
  font-size: clamp(6rem, 16vw, 11rem);
  line-height: 1;
  color: transparent;
  -webkit-text-stroke: 1px rgba(212, 175, 55, 0.1);
  pointer-events: none;
}

.page-about .about-hero-copy .section-kicker {
  margin-bottom: 12px;
}

.page-about .about-hero-copy h1 {
  font-family: var(--font-heading);
  font-size: clamp(2rem, 5vw, 3.4rem);
  line-height: 1.16;
  letter-spacing: 0.01em;
  margin: 0 0 clamp(16px, 3vw, 24px);
}

.page-about .about-hero-lead {
  font-size: 1.1rem;
  line-height: 1.85;
  color: var(--text-primary);
  margin: 0 0 14px;
}

.page-about .about-hero-text {
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-muted);
  margin: 0;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* 核心数据 */
.page-about .about-stat-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .about-stat-card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(145deg, rgba(212, 175, 55, 0.08), transparent 55%), var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cut);
  padding: clamp(18px, 3vw, 28px) clamp(14px, 2.5vw, 22px);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-stat-card::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 3px;
  background: var(--about-card-line);
}

.page-about .about-stat-card:nth-child(2n)::before {
  background: linear-gradient(90deg, var(--accent-red), var(--accent-gold));
}

.page-about .about-stat-card::after {
  content: "";
  position: absolute;
  right: -16px;
  bottom: -24px;
  width: 72px;
  height: 72px;
  border: 2px solid rgba(212, 175, 55, 0.1);
  border-radius: 50%;
  pointer-events: none;
}

.page-about .about-stat-card:nth-child(2n)::after {
  border-color: rgba(192, 57, 43, 0.1);
}

.page-about .about-stat-card:hover {
  border-color: rgba(212, 175, 55, 0.55);
  transform: translateY(-3px);
}

.page-about .about-stat-num {
  display: block;
  font-family: var(--font-numeric);
  font-size: clamp(2rem, 4vw, 3.2rem);
  font-weight: 700;
  line-height: 1.1;
  color: var(--accent-gold);
}

.page-about .about-stat-unit {
  font-size: 0.55em;
  margin-left: 2px;
  color: var(--accent-red);
}

.page-about .about-stat-label {
  display: block;
  margin-top: 10px;
  font-size: 0.85rem;
  color: var(--text-muted);
}

/* 页内目录 */
.page-about .about-toc {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 18px 0 20px;
  margin-bottom: 8px;
  border-bottom: 1px solid var(--border-color);
}

.page-about .about-toc a {
  padding: 6px 16px;
  font-size: 0.875rem;
  color: var(--text-muted);
  text-decoration: none;
  border: 1px solid var(--border-color);
  border-radius: 999px;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-toc a:hover,
.page-about .about-toc a:focus-visible {
  color: var(--accent-gold);
  border-color: var(--accent-gold);
  transform: translateY(-2px);
  outline: none;
}

/* 发展历程 */
.page-about .about-milestones {
  padding: clamp(28px, 5vw, 64px) 0;
}

.page-about .section-head {
  max-width: 760px;
}

.page-about .about-milestone-img,
.page-about .about-cert-img,
.page-about .about-team-img {
  display: block;
  max-width: 100%;
  height: auto;
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cut);
  object-fit: cover;
}

.page-about .about-milestone-img {
  width: 100%;
  margin: clamp(24px, 4vw, 40px) 0 clamp(16px, 3vw, 24px);
}

.page-about .about-trust-line {
  padding: 14px 18px;
  margin: 0 0 clamp(24px, 4vw, 40px);
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-muted);
  background: rgba(212, 175, 55, 0.06);
  border-left: 3px solid var(--accent-gold);
  border-radius: 0 10px 10px 0;
}

/* 时间轴 */
.page-about .about-timeline {
  position: relative;
  padding-left: 32px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 12px;
  bottom: 16px;
  left: 6px;
  width: 2px;
  background: linear-gradient(180deg, var(--accent-gold), var(--accent-red), transparent);
}

.page-about .about-tl-item {
  position: relative;
  margin-bottom: clamp(20px, 3vw, 28px);
}

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

.page-about .about-tl-dot {
  position: absolute;
  top: 6px;
  left: -32px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--accent-gold);
  border: 3px solid var(--bg-primary);
  box-shadow: 0 0 0 2px var(--accent-gold);
}

.page-about .about-tl-card {
  background: var(--bg-panel);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cut);
  padding: clamp(16px, 3vw, 22px);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-tl-card:hover {
  border-color: rgba(212, 175, 55, 0.5);
  transform: translateY(-3px);
}

.page-about .about-tl-stage {
  display: inline-block;
  margin-bottom: 10px;
  font-size: 0.75rem;
  font-weight: 600;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--accent-gold);
}

.page-about .about-tl-card h3 {
  font-family: var(--font-heading);
  font-size: 1.15rem;
  letter-spacing: 0.02em;
  margin: 0 0 8px;
}

.page-about .about-tl-card > p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .about-tl-detail {
  margin-top: 14px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.page-about .about-tl-detail summary {
  cursor: pointer;
  list-style: none;
  font-size: 0.85rem;
  color: var(--info-blue);
  transition: color 0.2s var(--ease);
}

.page-about .about-tl-detail summary::-webkit-details-marker {
  display: none;
}

.page-about .about-tl-detail summary:hover,
.page-about .about-tl-detail summary:focus-visible {
  color: var(--accent-gold);
  outline: none;
}

.page-about .about-tl-detail summary::before {
  content: "+";
  display: inline-block;
  width: 16px;
  font-weight: 700;
  color: var(--accent-gold);
}

.page-about .about-tl-detail[open] summary::before {
  content: "−";
}

.page-about .about-tl-detail p {
  margin: 10px 0 0;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--text-muted);
}

/* 资质与认证 */
.page-about .about-certs {
  padding: clamp(28px, 5vw, 64px) 0;
  background: linear-gradient(180deg, transparent, rgba(42, 62, 90, 0.35), transparent);
}

.page-about .about-cert-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  align-items: center;
}

.page-about .about-cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(20px, 3vw, 32px);
}

.page-about .about-cert-card {
  background: linear-gradient(135deg, var(--bg-panel-soft), var(--bg-panel));
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cut);
  padding: 20px;
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-cert-card:hover {
  border-color: rgba(212, 175, 55, 0.55);
  transform: translateY(-3px);
}

.page-about .about-cert-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 48px;
  height: 48px;
  margin-bottom: 14px;
  background: rgba(212, 175, 55, 0.1);
  border-radius: 12px;
  color: var(--accent-gold);
}

.page-about .about-cert-icon svg {
  width: 24px;
  height: 24px;
  stroke-width: 1.8;
}

.page-about .about-cert-title {
  margin: 0 0 4px;
  font-size: 1.05rem;
  font-weight: 600;
  line-height: 1.4;
}

.page-about .about-cert-badge {
  display: inline-block;
  margin-bottom: 8px;
  padding: 2px 8px;
  font-family: var(--font-numeric);
  font-size: 0.8rem;
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--accent-red);
  background: rgba(192, 57, 43, 0.08);
  border-radius: 4px;
}

.page-about .about-cert-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.7;
  color: var(--text-muted);
}

.page-about .about-cert-img {
  width: min(100%, 800px);
  margin-inline: auto;
}

/* 团队与组织 */
.page-about .about-team {
  padding: clamp(28px, 5vw, 64px) 0;
}

.page-about .about-team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 48px);
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .about-team-copy p {
  margin: 0 0 16px;
  font-size: 0.95rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-team-copy .btn {
  margin-top: 8px;
}

.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-team-card {
  background: var(--bg-panel);
  border-left: 3px solid var(--accent-gold);
  border-radius: 0 10px 10px 0;
  padding: 18px 20px;
  transition: background-color 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .about-team-card:hover {
  background: var(--bg-panel-soft);
  transform: translateX(4px);
}

.page-about .about-team-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: 1.05rem;
}

.page-about .about-team-card p {
  margin: 0;
  font-size: 0.875rem;
  line-height: 1.75;
  color: var(--text-muted);
}

.page-about .about-team-img {
  width: min(100%, 800px);
  margin: clamp(24px, 4vw, 40px) auto 0;
}

/* 社会责任 */
.page-about .about-social {
  padding: clamp(28px, 5vw, 64px) 0;
}

.page-about .about-social-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  margin-top: clamp(20px, 3vw, 36px);
}

.page-about .about-social-card {
  padding: 24px;
  background: var(--bg-primary);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-cut);
  transition: border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-social-card:hover {
  border-color: rgba(212, 175, 55, 0.5);
  background: var(--bg-panel);
}

.page-about .about-social-card h3 {
  margin: 0 0 10px;
  font-family: var(--font-heading);
  font-size: 1.1rem;
  color: var(--accent-gold);
}

.page-about .about-social-card p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-muted);
}

.page-about .about-social-card a {
  color: var(--info-blue);
  text-decoration: underline;
  text-underline-offset: 4px;
}

.page-about .about-social-card a:hover,
.page-about .about-social-card a:focus-visible {
  color: var(--accent-gold);
}

/* 底部联系引导 */
.page-about .about-contact-cta {
  border-top: 1px solid var(--border-color);
  margin-top: clamp(16px, 3vw, 32px);
  padding: clamp(28px, 5vw, 56px) 0 0;
}

.page-about .about-contact-cta .container {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
  align-items: center;
}

.page-about .about-contact-cta h2 {
  margin: 0 0 8px;
  font-family: var(--font-heading);
  font-size: clamp(1.4rem, 3vw, 2rem);
}

.page-about .about-contact-cta p {
  margin: 0;
  font-size: 0.95rem;
  line-height: 1.75;
  color: var(--text-muted);
}

/* 平板 */
@media (min-width: 768px) {
  .page-about .about-cert-grid {
    grid-template-columns: repeat(2, 1fr);
  }

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

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

  .page-about .about-contact-cta .container {
    grid-template-columns: 1fr auto;
  }
}

/* 桌面 */
@media (min-width: 1024px) {
  .page-about .about-hero-inner {
    grid-template-columns: 1.25fr 0.95fr;
  }

  .page-about .about-timeline {
    display: grid;
    grid-template-columns: repeat(6, minmax(0, 1fr));
    gap: 20px;
    padding-left: 0;
  }

  .page-about .about-timeline::before {
    top: 12px;
    bottom: auto;
    left: 0;
    right: 0;
    width: auto;
    height: 2px;
    background: linear-gradient(90deg, var(--accent-gold), var(--accent-red));
  }

  .page-about .about-tl-item {
    margin-bottom: 0;
    padding-top: 26px;
  }

  .page-about .about-tl-dot {
    top: 6px;
    left: calc(50% - 7px);
  }

  .page-about .about-cert-layout {
    grid-template-columns: 1.4fr 0.6fr;
  }

  .page-about .about-team-layout {
    grid-template-columns: 0.9fr 1.1fr;
  }
}