.page-about .about-wrap {
  max-width: var(--container-w);
  margin-inline: auto;
  padding-inline: var(--container-pad);
}

/* ===== 首屏英雄区 ===== */
.page-about .about-hero {
  position: relative;
  background: var(--c-deep);
  color: var(--c-white);
  padding: 40px 0 72px;
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: 0;
  width: 280px;
  height: 280px;
  right: -80px;
  top: -80px;
  background: radial-gradient(circle, rgba(57, 255, 20, 0.28) 0%, rgba(57, 255, 20, 0) 68%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  z-index: 0;
  left: -20%;
  right: 42%;
  bottom: -18px;
  height: 44px;
  background: var(--c-orange);
  transform: skewX(-14deg);
}

.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 36px;
}

.page-about .about-hero .breadcrumbs ol {
  list-style: none;
  margin: 0 0 16px;
  padding: 0;
  display: flex;
  gap: 10px;
  font-size: 13px;
}

.page-about .about-hero .breadcrumbs li + li::before {
  content: "/";
  margin-right: 10px;
  color: rgba(255, 255, 255, 0.4);
}

.page-about .about-hero .breadcrumbs a {
  color: rgba(255, 255, 255, 0.72);
  text-decoration: none;
}

.page-about .about-hero .breadcrumbs a:hover {
  color: var(--c-lime);
}

.page-about .about-hero .section-label {
  color: var(--c-lime);
  margin-bottom: 8px;
}

.page-about .about-hero h1 {
  font-family: var(--font-heading);
  font-size: clamp(30px, 6vw, 52px);
  font-weight: 900;
  line-height: 1.14;
  letter-spacing: 0.02em;
  margin: 0 0 20px;
  color: var(--c-white);
}

.page-about .about-h1-sub {
  display: block;
  color: var(--c-lime);
  font-size: 0.62em;
  font-weight: 700;
  margin-top: 10px;
}

.page-about .about-hero-lead {
  font-size: 17px;
  line-height: 1.75;
  max-width: 600px;
  color: rgba(255, 255, 255, 0.86);
  margin: 0 0 28px;
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-hero-anchor {
  border-color: rgba(255, 255, 255, 0.9);
  color: var(--c-white);
  background: transparent;
}

.page-about .about-hero-anchor:hover {
  background: rgba(255, 255, 255, 0.14);
}

.page-about .about-hero-img {
  aspect-ratio: 500 / 350;
  border: 3px solid var(--c-white);
  box-shadow: 8px 8px 0 rgba(57, 255, 20, 0.22);
  background: transparent;
}

.page-about .about-hero-img .image-container-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

/* ===== 起点：从导航到品牌 ===== */
.page-about .about-origin {
  background: var(--c-light);
  padding: 64px 0 48px;
}

.page-about .about-split {
  display: grid;
  gap: 28px;
}

.page-about .about-split-note {
  border-left: 3px solid var(--c-orange);
  padding-left: 16px;
}

.page-about .about-note-year {
  font-family: var(--font-heading);
  font-size: 34px;
  font-weight: 900;
  color: var(--c-deep);
  margin: 4px 0 2px;
}

.page-about .about-note-caption {
  font-size: 13px;
  letter-spacing: 0.06em;
  text-transform: uppercase;
  color: var(--c-gray);
  margin: 0;
}

.page-about .about-split-main h2,
.page-about .about-section-head h2,
.page-about .about-philosophy-head h2,
.page-about .about-final-copy h2 {
  font-family: var(--font-heading);
  font-size: clamp(26px, 3.6vw, 38px);
  font-weight: 900;
  line-height: 1.2;
  color: var(--c-deep);
  margin: 0 0 14px;
}

.page-about .about-split-main .prose {
  font-size: 16px;
  line-height: 1.8;
  color: var(--c-text);
  max-width: 720px;
}

.page-about .about-split-main .prose p {
  margin: 0 0 16px;
}

.page-about .about-text-link {
  display: inline-block;
  margin-top: 8px;
  font-weight: 700;
  color: var(--c-orange);
  text-decoration: none;
  border-bottom: 2px solid currentColor;
  padding-bottom: 2px;
}

.page-about .about-text-link:hover {
  color: var(--c-deep);
}

/* ===== 演进里程碑 ===== */
.page-about .about-timeline-section {
  background: var(--c-light);
  padding: 0 0 72px;
}

.page-about .about-section-head {
  margin: 0 0 32px;
  max-width: 680px;
}

.page-about .about-section-head .section-label {
  margin-bottom: 8px;
}

.page-about .about-section-desc {
  color: var(--c-gray);
  font-size: 15px;
  line-height: 1.6;
  margin: 10px 0 0;
}

.page-about .timeline-list {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 34px;
  bottom: 34px;
  width: 3px;
  background: linear-gradient(180deg, var(--c-deep) 0%, var(--c-orange) 52%, var(--c-lime) 100%);
  border-radius: 2px;
}

.page-about .timeline-item {
  position: relative;
  display: flex;
  gap: 14px;
  padding: 8px 0;
}

.page-about .timeline-rail {
  flex-shrink: 0;
  width: 40px;
  display: flex;
  justify-content: center;
}

.page-about .timeline-dot {
  width: 16px;
  height: 16px;
  margin-top: 18px;
  border-radius: 50%;
  background: var(--c-orange);
  border: 3px solid var(--c-white);
  outline: 3px solid var(--c-deep);
}

.page-about .timeline-card {
  flex: 1;
  background: var(--c-white);
  border: 2px solid var(--c-deep);
  box-shadow: var(--shadow-card);
  min-width: 0;
}

.page-about .timeline-summary {
  list-style: none;
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 10px;
  padding: 14px 18px;
  cursor: pointer;
  font-family: var(--font-heading);
}

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

.page-about .timeline-summary:focus-visible {
  outline: 3px solid var(--c-lime);
  outline-offset: -2px;
}

.page-about .timeline-year {
  font-size: 27px;
  font-weight: 900;
  color: var(--c-orange);
  letter-spacing: 0.02em;
}

.page-about .timeline-title {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-deep);
  line-height: 1.35;
}

.page-about .timeline-card[open] .timeline-summary {
  border-bottom: 2px solid var(--c-border);
  background: rgba(255, 122, 0, 0.06);
}

.page-about .timeline-card p {
  margin: 0;
  padding: 14px 18px 18px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--c-gray);
}

/* ===== 服务生态与规模 ===== */
.page-about .about-scale {
  background: var(--c-deep);
  color: var(--c-white);
  padding: 64px 0;
}

.page-about .about-section-head--light .section-label {
  color: var(--c-orange);
}

.page-about .about-section-head--light h2 {
  color: var(--c-white);
}

.page-about .about-section-head--light .about-section-desc {
  color: rgba(255, 255, 255, 0.62);
}

.page-about .scale-grid {
  display: grid;
  gap: 32px;
}

.page-about .scale-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 14px;
}

.page-about .stat-chip {
  position: relative;
  background: rgba(255, 255, 255, 0.07);
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 18px 18px 18px 20px;
}

.page-about .stat-chip::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 4px;
  background: var(--c-lime);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-heading);
  font-size: clamp(24px, 3.4vw, 36px);
  font-weight: 900;
  color: var(--c-orange);
  line-height: 1.1;
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: rgba(255, 255, 255, 0.72);
}

.page-about .scale-media {
  margin: 0;
}

.page-about .scale-img {
  aspect-ratio: 400 / 300;
  border: 2px solid rgba(255, 255, 255, 0.35);
  box-shadow: 8px 8px 0 rgba(255, 122, 0, 0.34);
}

.page-about .scale-img .image-container-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .scale-foot {
  display: grid;
  gap: 12px;
  margin-top: 32px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.18);
}

.page-about .scale-metrics,
.page-about .scale-trust {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 255, 255, 0.66);
}

.page-about .scale-trust {
  color: rgba(255, 255, 255, 0.9);
  font-weight: 500;
}

.page-about .about-scale-cta {
  margin-top: 24px;
}

/* ===== 发展理念 ===== */
.page-about .about-philosophy {
  background: var(--c-light);
  padding: 64px 0;
}

.page-about .about-philosophy-head {
  display: grid;
  gap: 12px;
  margin-bottom: 32px;
}

.page-about .about-philosophy-lead {
  margin: 0;
  max-width: 560px;
  color: var(--c-gray);
  font-size: 16px;
  line-height: 1.7;
}

.page-about .philosophy-grid {
  display: grid;
  gap: 28px;
}

.page-about .philosophy-main {
  display: grid;
  gap: 20px;
}

.page-about .philosophy-img {
  aspect-ratio: 300 / 300;
  border: 2px solid var(--c-deep);
  box-shadow: var(--shadow-card);
  max-width: 300px;
}

.page-about .philosophy-img .image-container-media {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.page-about .philosophy-main .prose p {
  margin: 0 0 14px;
  color: var(--c-text);
  line-height: 1.8;
}

.page-about .principle-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .principle-item {
  position: relative;
  background: var(--c-white);
  border: 2px solid var(--c-deep);
  box-shadow: var(--shadow-card);
  padding: 22px;
}

.page-about .principle-no {
  display: inline-block;
  font-family: var(--font-heading);
  font-size: 14px;
  font-weight: 900;
  letter-spacing: 0.08em;
  color: var(--c-orange);
  border: 1px solid var(--c-orange);
  padding: 3px 8px;
  margin-bottom: 12px;
}

.page-about .principle-item h3 {
  font-family: var(--font-heading);
  font-size: 20px;
  font-weight: 700;
  color: var(--c-deep);
  margin: 0 0 10px;
}

.page-about .principle-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.7;
  color: var(--c-gray);
}

/* ===== 结尾 CTA ===== */
.page-about .about-final-cta {
  background: var(--c-white);
  border-top: 4px solid var(--c-orange);
  padding: 64px 0;
}

.page-about .about-final-cta-inner {
  display: grid;
  gap: 28px;
  align-items: center;
}

.page-about .about-final-copy .section-label {
  margin-bottom: 8px;
}

.page-about .about-final-copy h2 {
  margin-bottom: 12px;
}

.page-about .about-final-copy p {
  margin: 0 0 10px;
  color: var(--c-gray);
  line-height: 1.7;
  max-width: 680px;
}

.page-about .about-contact-line {
  font-size: 14px;
  color: var(--c-gray);
}

.page-about .about-final-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ===== 桌面端增强 ===== */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 56px 0 96px;
  }

  .page-about .about-hero-grid {
    grid-template-columns: 7fr 5fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .about-origin {
    padding: 80px 0 64px;
  }

  .page-about .about-split {
    grid-template-columns: 220px 1fr;
    gap: 48px;
  }

  .page-about .about-split-note {
    border-left: 0;
    border-top: 3px solid var(--c-orange);
    padding-left: 0;
    padding-top: 14px;
  }

  .page-about .about-timeline-section {
    padding: 0 0 96px;
  }

  .page-about .timeline-list {
    max-width: 920px;
  }

  .page-about .timeline-item {
    padding: 10px 0;
  }

  .page-about .about-scale {
    padding: 88px 0;
  }

  .page-about .scale-grid {
    grid-template-columns: 3fr 2fr;
    align-items: center;
    gap: 48px;
  }

  .page-about .scale-stats {
    gap: 18px;
  }

  .page-about .about-philosophy {
    padding: 88px 0;
  }

  .page-about .about-philosophy-head {
    grid-template-columns: 1fr 1fr;
    align-items: end;
    gap: 32px;
  }

  .page-about .philosophy-grid {
    grid-template-columns: 2fr 5fr;
    align-items: start;
    gap: 48px;
  }

  .page-about .philosophy-main {
    gap: 24px;
  }

  .page-about .principle-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }

  .page-about .about-final-cta {
    padding: 80px 0;
  }

  .page-about .about-final-cta-inner {
    grid-template-columns: 7fr 5fr;
    gap: 48px;
  }
}