.page-about {
  --about-hero-bg-start: #1B5E4A;
  --about-hero-bg-end: #2A7F6E;
  --about-accent-glow: rgba(232, 163, 75, 0.25);
  --about-card-bg: #ffffff;
  --about-timeline-color: #C8E6D9;
  --about-timeline-dot-color: #E8A34B;
  --about-milestone-shadow: 0 4px 16px rgba(26, 60, 52, 0.08);
  --about-milestone-shadow-hover: 0 8px 28px rgba(26, 60, 52, 0.16);
  --about-member-transition: 0.3s cubic-bezier(0.25, 0.46, 0.45, 0.94);
}

/* ── 首屏 Hero ── */
.page-about__hero {
  padding: 0;
  background: linear-gradient(135deg, var(--about-hero-bg-start) 0%, var(--about-hero-bg-end) 70%, #1A3C34 100%);
  color: #fff;
  position: relative;
  overflow: hidden;
  min-height: 70vh;
  display: flex;
  align-items: center;
}

.page-about__hero::before {
  content: '';
  position: absolute;
  inset: 0;
  background: radial-gradient(circle at 85% 20%, var(--about-accent-glow) 0%, transparent 60%);
  pointer-events: none;
}

.page-about__hero-inner {
  display: flex;
  flex-direction: column;
  gap: 2rem;
  padding: 6rem 0 4rem;
  position: relative;
  z-index: 1;
}

.page-about__breadcrumb {
  display: flex;
  align-items: center;
  gap: 0.5rem;
  font-family: var(--font-accent);
  font-size: 0.875rem;
  color: rgba(255, 255, 255, 0.7);
  margin-bottom: 0.5rem;
}

.page-about__breadcrumb-link {
  color: rgba(255, 255, 255, 0.8);
  text-decoration: none;
  transition: color var(--transition-base);
}

.page-about__breadcrumb-link:hover {
  color: #fff;
}

.page-about__breadcrumb-sep {
  color: rgba(255, 255, 255, 0.4);
}

.page-about__breadcrumb-current {
  color: #fff;
  font-weight: 600;
}

.page-about__hero-title {
  font-family: var(--font-heading);
  font-size: clamp(2.2rem, 6vw, 4rem);
  font-weight: 700;
  line-height: 1.15;
  color: #fff;
  margin: 0 0 0.75rem;
  letter-spacing: -0.01em;
}

.page-about__hero-sub {
  font-family: var(--font-body);
  font-size: clamp(1rem, 2vw, 1.25rem);
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.88);
  max-width: 560px;
  margin: 0;
}

.page-about__hero-visual {
  position: absolute;
  right: -10%;
  top: -5%;
  width: 60%;
  height: 130%;
  pointer-events: none;
}

.page-about__hero-shape {
  position: absolute;
  border-radius: 0;
}

.page-about__hero-shape--1 {
  width: 280px;
  height: 280px;
  background: rgba(232, 163, 75, 0.12);
  top: 10%;
  right: 12%;
  transform: rotate(25deg);
  clip-path: polygon(0 0, 100% 20%, 80% 100%, 0 80%);
}

.page-about__hero-shape--2 {
  width: 200px;
  height: 200px;
  border: 2px solid rgba(255, 255, 255, 0.08);
  top: 55%;
  right: 30%;
  transform: rotate(-15deg);
}

.page-about__hero-shape--3 {
  width: 120px;
  height: 120px;
  background: rgba(200, 230, 217, 0.08);
  top: 30%;
  right: 5%;
  clip-path: polygon(50% 0%, 100% 50%, 50% 100%, 0% 50%);
}

/* ── 通用章节标签 ── */
.page-about__section-tag {
  display: inline-block;
  margin-bottom: 0.75rem;
  font-family: var(--font-accent);
  font-weight: 600;
  font-size: 0.8rem;
  letter-spacing: 0.04em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(232, 163, 75, 0.12);
  padding: 0.25rem 0.75rem;
  border-radius: 100px;
}

.page-about__section-title {
  font-family: var(--font-heading);
  font-size: clamp(1.75rem, 3.5vw, 2.5rem);
  font-weight: 700;
  color: var(--color-heading);
  margin: 0 0 1.25rem;
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about__section-text {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.8;
  color: var(--color-text);
  margin: 0 0 1rem;
  max-width: 600px;
}

/* ── 品牌起源 ── */
.page-about__origin {
  padding: 5rem 0;
  background: var(--color-bg);
}

.page-about__origin-grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  align-items: center;
}

.page-about__origin-content {
  order: 2;
  flex: 1;
}

.page-about__origin-visual {
  order: 1;
  flex-shrink: 0;
  width: 100%;
  max-width: 480px;
}

.page-about__origin-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  display: block;
  object-fit: cover;
}

.page-about__inline-btn {
  margin-top: 0.75rem;
  display: inline-flex;
}

/* ── 设计理念 ── */
.page-about__philosophy {
  padding: 5rem 0;
  background: #fff;
}

.page-about__philosophy-grid {
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  align-items: center;
}

.page-about__philosophy-visual {
  flex-shrink: 0;
  width: 100%;
  max-width: 400px;
}

.page-about__philosophy-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  display: block;
  object-fit: cover;
}

.page-about__philosophy-content {
  flex: 1;
}

.page-about__principle-list {
  list-style: none;
  padding: 0;
  margin: 1.5rem 0 0;
  display: flex;
  flex-direction: column;
  gap: 0.75rem;
}

.page-about__principle-item {
  display: flex;
  align-items: baseline;
  gap: 0.6rem;
  font-family: var(--font-body);
  font-size: 0.95rem;
  color: var(--color-text);
  line-height: 1.6;
}

.page-about__principle-icon {
  color: var(--color-accent);
  font-size: 1.1rem;
  flex-shrink: 0;
}

/* ── 团队掠影 ── */
.page-about__team {
  padding: 5rem 0;
  background: var(--color-bg);
}

.page-about__team-header {
  text-align: center;
  margin-bottom: 3rem;
}

.page-about__team-title {
  margin-bottom: 0.75rem;
}

.page-about__team-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  max-width: 600px;
  margin: 0 auto;
}

.page-about__team-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(160px, 1fr));
  gap: 1.5rem;
  margin-bottom: 2.5rem;
}

.page-about__member-card {
  background: #fff;
  border-radius: var(--radius-md);
  padding: 1.5rem 1rem;
  text-align: center;
  box-shadow: var(--shadow-card);
  transition: transform var(--about-member-transition), box-shadow var(--about-member-transition);
  cursor: default;
  outline: none;
}

.page-about__member-card:hover,
.page-about__member-card:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-card-hover);
}

.page-about__member-avatar {
  margin: 0 auto 0.75rem;
  width: 80px;
  height: 80px;
}

.page-about__member-avatar svg {
  display: block;
  width: 100%;
  height: 100%;
}

.page-about__member-role {
  font-family: var(--font-heading);
  font-weight: 700;
  font-size: 1rem;
  color: var(--color-heading);
  margin-bottom: 0.25rem;
}

.page-about__member-bio {
  font-family: var(--font-body);
  font-size: 0.85rem;
  color: var(--color-text);
  line-height: 1.4;
  opacity: 0.8;
}

.page-about__team-img-wrapper {
  max-width: 600px;
  margin: 0 auto;
}

.page-about__team-img {
  width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-card);
  display: block;
  object-fit: cover;
}

/* ── 重要历程 ── */
.page-about__timeline {
  padding: 5rem 0;
  background: #fff;
}

.page-about__timeline-header {
  text-align: center;
  margin-bottom: 3.5rem;
}

.page-about__timeline-desc {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: var(--color-text);
  max-width: 540px;
  margin: 0 auto;
}

.page-about__timeline-track {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 2.5rem;
  max-width: 800px;
  margin: 0 auto;
  padding: 0.5rem 0;
}

.page-about__timeline-line {
  position: absolute;
  left: 2rem;
  top: 0;
  bottom: 0;
  width: 2px;
  background: var(--about-timeline-color);
  z-index: 0;
}

.page-about__milestone {
  position: relative;
  z-index: 1;
  display: flex;
  align-items: flex-start;
  gap: 1.25rem;
  padding-left: 3.5rem;
}

.page-about__milestone-dot {
  position: absolute;
  left: 1.25rem;
  top: 0.5rem;
  width: 1.5rem;
  height: 1.5rem;
  border-radius: 50%;
  background: var(--about-timeline-dot-color);
  border: 3px solid #fff;
  box-shadow: 0 0 0 2px var(--about-timeline-dot-color);
  flex-shrink: 0;
  z-index: 2;
}

.page-about__milestone-card {
  background: var(--about-card-bg);
  border-radius: var(--radius-md);
  padding: 1.25rem 1.5rem;
  box-shadow: var(--about-milestone-shadow);
  transition: box-shadow var(--transition-base), transform var(--transition-base);
  flex: 1;
  border-left: 3px solid var(--color-primary);
}

.page-about__milestone-card:hover {
  box-shadow: var(--about-milestone-shadow-hover);
  transform: translateY(-2px);
}

.page-about__milestone-label {
  display: inline-block;
  font-family: var(--font-accent);
  font-weight: 700;
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--color-accent);
  background: rgba(232, 163, 75, 0.1);
  padding: 0.2rem 0.6rem;
  border-radius: 100px;
  margin-bottom: 0.5rem;
}

.page-about__milestone-title {
  font-family: var(--font-heading);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--color-heading);
  margin: 0 0 0.4rem;
}

.page-about__milestone-text {
  font-family: var(--font-body);
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--color-text);
  margin: 0;
  max-width: 480px;
}

/* ── 底部 CTA ── */
.page-about__cta {
  padding: 4rem 0;
  background: linear-gradient(135deg, var(--color-deep) 0%, var(--color-primary) 100%);
  color: #fff;
}

.page-about__cta-inner {
  text-align: center;
  max-width: 640px;
  margin: 0 auto;
}

.page-about__cta-title {
  font-family: var(--font-heading);
  font-size: clamp(1.5rem, 3vw, 2rem);
  font-weight: 700;
  color: #fff;
  margin: 0 0 0.75rem;
  line-height: 1.25;
}

.page-about__cta-text {
  font-family: var(--font-body);
  font-size: 1rem;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.9);
  margin: 0 0 1.75rem;
}

.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 1rem;
  justify-content: center;
}

.page-about__cta-btn {
  min-width: 180px;
}

.page-about__cta-btn--outline {
  background: transparent;
  border: 2px solid rgba(255, 255, 255, 0.6);
  color: #fff;
}

.page-about__cta-btn--outline:hover {
  background: rgba(255, 255, 255, 0.08);
  border-color: #fff;
}

/* ── 响应式 ── */
@media (min-width: 640px) {
  .page-about__hero-inner {
    flex-direction: row;
    align-items: center;
    padding: 8rem 0 5rem;
  }

  .page-about__hero-text {
    flex: 1;
  }

  .page-about__hero-visual {
    width: 50%;
    right: -5%;
  }

  .page-about__origin-grid {
    flex-direction: row;
  }

  .page-about__origin-content {
    order: 1;
  }

  .page-about__origin-visual {
    order: 2;
  }

  .page-about__philosophy-grid {
    flex-direction: row;
  }

  .page-about__timeline-line {
    left: 50%;
    transform: translateX(-50%);
  }

  .page-about__milestone {
    width: 50%;
    padding-left: 0;
  }

  .page-about__milestone--left {
    align-self: flex-start;
    padding-right: 2.5rem;
    text-align: right;
    flex-direction: row-reverse;
  }

  .page-about__milestone--left .page-about__milestone-dot {
    left: auto;
    right: -0.75rem;
  }

  .page-about__milestone--left .page-about__milestone-card {
    border-left: none;
    border-right: 3px solid var(--color-primary);
  }

  .page-about__milestone--right {
    align-self: flex-end;
    padding-left: 2.5rem;
  }

  .page-about__milestone--right .page-about__milestone-dot {
    left: -0.75rem;
  }

  .page-about__milestone--left .page-about__milestone-text {
    margin-left: auto;
  }

  .page-about__team-grid {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    min-height: 60vh;
  }

  .page-about__origin-grid {
    gap: 4rem;
  }

  .page-about__philosophy-grid {
    gap: 4rem;
  }

  .page-about__milestone-card {
    padding: 1.5rem 2rem;
  }

  .page-about__cta {
    padding: 5rem 0;
  }
}

/* ── 工具提示（纯CSS模拟） ── */
.page-about__member-card[data-tooltip] {
  position: relative;
}

.page-about__member-card[data-tooltip]::after {
  content: attr(data-tooltip);
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%) scale(0.92);
  background: var(--color-heading);
  color: #fff;
  font-family: var(--font-accent);
  font-size: 0.75rem;
  padding: 0.35rem 0.75rem;
  border-radius: var(--radius-sm);
  white-space: nowrap;
  opacity: 0;
  pointer-events: none;
  transition: opacity var(--transition-base), transform var(--transition-base);
  z-index: 10;
  box-shadow: 0 2px 8px rgba(0,0,0,0.15);
}

.page-about__member-card[data-tooltip]:hover::after,
.page-about__member-card[data-tooltip]:focus-visible::after {
  opacity: 1;
  transform: translateX(-50%) scale(1);
}