.page-about {
  position: relative;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--sans);
  line-height: 1.7;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 20px var(--gutter) 0;
  font-size: 14px;
}
.page-about .crumb-link {
  color: var(--green-deep);
  text-decoration: none;
  font-weight: 600;
}
.page-about .crumb-link:hover {
  color: var(--terra);
}
.page-about .crumb-current {
  color: var(--ink);
  font-weight: 700;
}
.page-about .crumbs .crumb-link[href="/"]::after {
  content: "›";
  margin-left: 8px;
  color: var(--gold);
}

/* ---------- 章节标签与编号 ---------- */
.page-about .section-label {
  display: inline-block;
  color: var(--gold);
  font-weight: 700;
  letter-spacing: 0.08em;
  font-size: 13px;
  border-left: 3px solid var(--terra);
  padding-left: 12px;
  margin-bottom: 18px;
}
.page-about .section-index {
  display: block;
  font-family: var(--mono);
  font-size: 64px;
  font-weight: 700;
  color: var(--terra);
  opacity: 0.9;
  line-height: 1;
  letter-spacing: -0.04em;
}
.page-about .about-section-head .section-label {
  align-self: flex-start;
  margin-top: 4px;
  background: var(--green-deep);
  color: var(--gold);
  padding: 4px 12px;
  border-left: none;
  border-radius: 999px;
}
.page-about .about-section-head {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 4px;
  padding-bottom: 24px;
}
.page-about .about-section-head h2 {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(26px, 4vw, 38px);
  color: var(--green-deep);
  line-height: 1.2;
  margin: 8px 0 0;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: 34px;
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 42px var(--gutter) 64px;
  grid-template-columns: 1fr;
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 180px;
  height: 180px;
  background: var(--terra);
  clip-path: polygon(0 0, 100% 0, 100% 100%);
  opacity: 0.1;
  z-index: 0;
}
.page-about .about-hero-copy {
  position: relative;
  z-index: 2;
}
.page-about h1 {
  font-family: var(--sans);
  font-weight: 800;
  font-size: clamp(32px, 6vw, 56px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--green-deep);
  margin: 0 0 20px;
}
.page-about .about-hero-lead {
  font-family: var(--serif);
  font-size: 17px;
  line-height: 1.8;
  color: #4a4a4a;
  max-width: 32em;
}
.page-about .about-hero-stats {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 30px;
}
.page-about .hero-stat {
  background: var(--green-deep);
  color: var(--paper);
  border-radius: var(--radius-md);
  padding: 14px 18px;
  min-width: 120px;
  flex: 1 1 140px;
}
.page-about .hero-stat-num {
  display: block;
  font-family: var(--mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--gold);
  line-height: 1.2;
}
.page-about .hero-stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: rgba(245, 240, 230, 0.72);
}
.page-about .about-hero-visual {
  position: relative;
  z-index: 1;
}
.page-about .about-hero-visual::before {
  content: "";
  position: absolute;
  inset: 16px -12px -12px 16px;
  background: var(--terra);
  opacity: 0.16;
  border-radius: var(--radius-lg);
  clip-path: polygon(8% 0, 100% 0, 94% 100%, 0 100%);
  z-index: 0;
}
.page-about .about-hero-img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

/* ---------- 通用章节容器 ---------- */
.page-about .about-origin,
.page-about .about-milestones,
.page-about .about-philosophy,
.page-about .about-team,
.page-about .about-recognition {
  max-width: var(--content-max);
  margin: 0 auto;
  padding: 64px var(--gutter) 32px;
}

/* ---------- 起源 ---------- */
.page-about .about-origin-body {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}
.page-about .about-origin-body p {
  font-size: 15px;
  color: #474747;
  margin: 0;
}
.page-about .origin-facts {
  display: grid;
  gap: 14px;
  grid-template-columns: 1fr;
  background: var(--fog);
  border-radius: var(--radius-lg);
  padding: 24px;
  margin-top: 36px;
}
.page-about .fact-item {
  display: flex;
  flex-direction: column;
  gap: 2px;
}
.page-about .fact-num {
  font-family: var(--mono);
  font-size: 36px;
  font-weight: 700;
  color: var(--green-deep);
  line-height: 1.1;
}
.page-about .fact-text {
  font-size: 13px;
  color: #5c5c5c;
}

/* ---------- 里程碑时间线 ---------- */
.page-about .timeline {
  position: relative;
  margin: 40px 0 28px;
  padding-left: 28px;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 9px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold), var(--terra) 55%, var(--green-deep));
  opacity: 0.45;
}
.page-about .timeline-item {
  position: relative;
  display: grid;
  grid-template-columns: 64px 1fr;
  gap: 14px;
  margin-bottom: 30px;
}
.page-about .timeline-item::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 20px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--gold);
  border: 3px solid var(--paper);
  box-shadow: 0 0 0 2px var(--gold);
}
.page-about .timeline-year {
  font-family: var(--mono);
  font-size: 22px;
  font-weight: 700;
  color: var(--terra);
  line-height: 1.4;
  padding-top: 4px;
}
.page-about .timeline-card {
  background: var(--white);
  border-radius: var(--radius-md);
  padding: 18px 20px;
  border: 1px solid var(--fog);
  border-left: 3px solid var(--gold);
  transition: transform var(--speed-fast) var(--ease), box-shadow var(--speed-fast) var(--ease);
}
.page-about .timeline-card:hover,
.page-about .timeline-card:focus-within {
  transform: translateX(4px);
  box-shadow: var(--shadow-soft);
}
.page-about .timeline-card h3 {
  font-family: var(--sans);
  font-size: 18px;
  font-weight: 700;
  color: var(--green-deep);
  margin: 0 0 6px;
}
.page-about .timeline-card p {
  font-size: 14px;
  color: #555;
  margin: 0;
}
.page-about .timeline-tip {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  font-size: 13px;
  font-weight: 600;
  color: var(--terra);
  transition: opacity var(--speed-base) var(--ease), max-height var(--speed-base) var(--ease), padding-top var(--speed-base) var(--ease);
}
.page-about .timeline-card:hover .timeline-tip,
.page-about .timeline-card:focus-within .timeline-tip {
  max-height: 48px;
  opacity: 1;
  padding-top: 8px;
}
.page-about .timeline-chart {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  margin-top: 12px;
}

/* ---------- 数据与编辑对照 ---------- */
.page-about .philosophy-lead,
.page-about .recognition-lead {
  font-family: var(--serif);
  font-size: 18px;
  line-height: 1.8;
  color: #4a4a4a;
  max-width: 34em;
  margin: 0 0 30px;
}
.page-about .philosophy-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
}
.page-about .philosophy-card {
  background: var(--white);
  border: 1px solid var(--fog);
  border-top: 4px solid var(--gold);
  border-radius: var(--radius-md);
  padding: 26px 22px 30px;
}
.page-about .philosophy-edit {
  border-top-color: var(--terra);
}
.page-about .philosophy-merge {
  border-top-color: var(--green-deep);
}
.page-about .philosophy-card h3 {
  font-family: var(--sans);
  font-size: 20px;
  font-weight: 800;
  color: var(--green-deep);
  margin: 0 0 14px;
}
.page-about .philosophy-card ul {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}
.page-about .philosophy-card li {
  position: relative;
  font-size: 14px;
  color: #444;
  padding-left: 16px;
}
.page-about .philosophy-card li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 7px;
  height: 7px;
  background: var(--gold);
  border-radius: 1px;
  transform: rotate(45deg);
}
.page-about .philosophy-card p {
  font-size: 14px;
  color: #444;
  margin: 0;
}
.page-about .philosophy-note,
.page-about .recognition-note {
  font-size: 14px;
  color: #666;
  background: var(--fog);
  border-radius: var(--radius-sm);
  padding: 14px 18px;
  margin: 28px 0 0;
}
.page-about .inline-link {
  color: var(--green-deep);
  font-weight: 700;
  text-decoration: underline;
  text-decoration-color: var(--gold);
  text-underline-offset: 4px;
}
.page-about .inline-link:hover {
  color: var(--terra);
  text-decoration-color: var(--terra);
}

/* ---------- 团队与协作 ---------- */
.page-about .team-layout {
  display: grid;
  gap: 32px;
  grid-template-columns: 1fr;
  align-items: center;
}
.page-about .team-copy > p {
  font-size: 16px;
  color: #444;
  margin: 0 0 22px;
  max-width: 34em;
}
.page-about .team-node {
  border: 1px solid var(--fog);
  border-left: 3px solid var(--green-deep);
  background: var(--white);
  border-radius: var(--radius-sm);
  margin-bottom: 14px;
  padding: 2px 18px;
  transition: border-color var(--speed-fast) var(--ease);
}
.page-about .team-node[open] {
  border-left-color: var(--gold);
}
.page-about .team-node summary {
  cursor: pointer;
  font-weight: 700;
  font-size: 16px;
  color: var(--green-deep);
  padding: 12px 0;
  list-style: none;
  display: flex;
  align-items: center;
  justify-content: space-between;
}
.page-about .team-node summary::-webkit-details-marker {
  display: none;
}
.page-about .team-node summary::after {
  content: "+";
  font-family: var(--mono);
  font-size: 22px;
  line-height: 1;
  color: var(--terra);
  transition: transform var(--speed-fast) var(--ease);
}
.page-about .team-node[open] summary::after {
  transform: rotate(45deg);
}
.page-about .team-node p {
  font-size: 14px;
  color: #555;
  padding-bottom: 14px;
  margin: 0;
}
.page-about .team-diagram {
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-soft);
}

/* ---------- 行业认可 ---------- */
.page-about .recognition-grid {
  display: grid;
  gap: 18px;
  grid-template-columns: 1fr;
  margin-bottom: 16px;
}
.page-about .recognition-card {
  position: relative;
  overflow: hidden;
  background: var(--green-deep);
  color: var(--paper);
  border-radius: var(--radius-lg);
  padding: 28px 24px;
}
.page-about .recognition-card::after {
  content: "";
  position: absolute;
  top: -24px;
  right: -24px;
  width: 90px;
  height: 90px;
  background: var(--gold);
  opacity: 0.1;
  border-radius: 50%;
}
.page-about .recognition-year {
  font-family: var(--mono);
  font-size: 14px;
  color: var(--gold);
  margin: 0 0 8px;
}
.page-about .recognition-card h3 {
  font-size: 20px;
  font-weight: 800;
  margin: 0 0 10px;
  color: #fff;
}
.page-about .recognition-card p {
  font-size: 14px;
  margin: 0;
  color: rgba(245, 240, 230, 0.75);
}

/* ---------- 底部CTA ---------- */
.page-about .about-cta {
  max-width: var(--content-max);
  margin: 56px auto 80px;
  padding: 0 var(--gutter);
}
.page-about .cta-card {
  position: relative;
  overflow: hidden;
  background: linear-gradient(135deg, var(--green-deep), var(--glass-deep));
  border-radius: var(--radius-lg);
  padding: 44px 26px;
  color: var(--paper);
}
.page-about .cta-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 220px;
  height: 100%;
  background: var(--terra);
  opacity: 0.14;
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 100%);
}
.page-about .cta-card h2 {
  position: relative;
  font-family: var(--sans);
  font-size: clamp(24px, 4vw, 36px);
  font-weight: 800;
  color: #fff;
  margin: 0 0 12px;
}
.page-about .cta-card p {
  position: relative;
  font-size: 16px;
  color: rgba(245, 240, 230, 0.8);
  max-width: 30em;
  margin: 0 0 28px;
}
.page-about .cta-card .btn {
  position: relative;
  margin: 4px 12px 4px 0;
}

/* ---------- 返回首页悬浮胶囊 ---------- */
.page-about .about-home-fab {
  position: fixed;
  right: 20px;
  bottom: 20px;
  z-index: 50;
  background: var(--glass-deep);
  color: var(--gold);
  border: 1px solid rgba(201, 162, 39, 0.4);
  border-radius: 999px;
  padding: 10px 18px;
  font-size: 14px;
  font-weight: 700;
  text-decoration: none;
  box-shadow: var(--shadow-float);
  backdrop-filter: blur(8px);
  transition: background var(--speed-fast) var(--ease), transform var(--speed-fast) var(--ease);
}
.page-about .about-home-fab:hover {
  background: var(--green-deep);
  transform: translateY(-2px);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-origin-body {
    grid-template-columns: 1fr 1fr;
    column-gap: 44px;
  }
  .page-about .about-origin-body p:first-child {
    grid-column: 1 / -1;
  }
  .page-about .origin-facts {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .recognition-grid {
    grid-template-columns: repeat(3, 1fr);
  }
}

@media (min-width: 920px) {
  .page-about .about-hero {
    grid-template-columns: 1.1fr 0.9fr;
    align-items: center;
    padding: 80px var(--gutter) 96px;
  }
  .page-about .about-origin,
  .page-about .about-milestones,
  .page-about .about-philosophy,
  .page-about .about-team,
  .page-about .about-recognition {
    padding: 96px var(--gutter) 48px;
  }
  .page-about .section-index {
    font-size: 80px;
  }
  .page-about .philosophy-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 16px;
  }
  .page-about .philosophy-card {
    padding: 30px 24px 40px;
  }
  .page-about .philosophy-data {
    clip-path: polygon(0 0, 100% 0, 100% 88%, 94% 100%, 0 100%);
  }
  .page-about .philosophy-edit {
    clip-path: polygon(0 0, 100% 0, 100% 100%, 0 100%, 6% 88%);
  }
  .page-about .philosophy-merge {
    clip-path: polygon(0 0, 100% 0, 100% 88%, 94% 100%, 0 100%);
  }
  .page-about .team-layout {
    grid-template-columns: 1fr 0.85fr;
    column-gap: 40px;
  }
  .page-about .team-diagram {
    max-height: 560px;
    object-fit: cover;
    object-position: left top;
  }
  .page-about .cta-card {
    padding: 56px 64px;
  }
}

@media (max-width: 480px) {
  .page-about .section-index {
    font-size: 46px;
  }
  .page-about .timeline-item {
    grid-template-columns: 56px 1fr;
    gap: 10px;
  }
  .page-about .timeline-year {
    font-size: 19px;
  }
  .page-about .timeline-card {
    padding: 16px;
  }
}