.page-about {
  position: relative;
  overflow: clip;
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
}
.page-about [id] {
  scroll-margin-top: calc(var(--header-total) + 16px);
}
.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}
.page-about .grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}
.page-about .page-about-section-head {
  margin-bottom: 28px;
}
.page-about .page-about-section-head h2 {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  line-height: 1.12;
  margin: 8px 0 0;
}
.page-about .page-about-section-head .eyebrow {
  color: var(--grass);
  letter-spacing: 0.14em;
}

/* 面包屑 */
.page-about .breadcrumb {
  margin: 0 0 18px;
  padding: 0;
  font-size: 0.78rem;
}
.page-about .breadcrumb ol {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}
.page-about .breadcrumb li + li::before {
  content: " / ";
  color: var(--line);
  margin-right: 6px;
}
.page-about .breadcrumb a {
  color: var(--ink);
  text-decoration: none;
}
.page-about .breadcrumb a:hover {
  color: var(--grass);
}

/* 首屏 */
.page-about-hero {
  position: relative;
  padding: 40px 0 52px;
  overflow: hidden;
  background:
    linear-gradient(rgba(18,18,18,0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18,18,18,0.05) 1px, transparent 1px),
    var(--paper);
  background-size: 32px 32px;
  border-bottom: 4px solid var(--ink);
}
.page-about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 44%;
  height: 100%;
  background: linear-gradient(135deg, transparent 0%, rgba(11,122,62,0.10) 80%);
  pointer-events: none;
}
.page-about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--grass) 0 24%, var(--gold) 24% 50%, var(--ink) 50% 100%);
  pointer-events: none;
}
.page-about-hero .container {
  position: relative;
  z-index: 1;
}
.page-about-hero-mark {
  position: absolute;
  right: 0;
  top: 0;
  width: 52%;
  height: 100%;
  opacity: 0.9;
  pointer-events: none;
}
.page-about-hero .display-title {
  margin: 8px 0 16px;
  font-size: clamp(2rem, 8vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}
.page-about-hero .page-lead {
  max-width: 640px;
  margin: 0 0 24px;
  font-size: 1.02rem;
  line-height: 1.75;
}

/* 章节目录 */
.page-about-chapter {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 14px;
  margin-top: 24px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}
.page-about-chapter a {
  font-family: var(--font-data);
  font-size: 0.78rem;
  text-decoration: none;
  color: var(--ink);
  letter-spacing: 0.02em;
  padding: 4px 10px;
  border: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}
.page-about-chapter a span {
  color: var(--grass);
  margin-right: 4px;
}
.page-about-chapter a:hover {
  color: var(--grass);
  border-color: var(--line);
}

/* 起源 */
.page-about-origin {
  padding: 64px 0;
  background: var(--paper);
}
.page-about-origin-copy > p {
  font-size: 1.02rem;
  line-height: 1.8;
  margin-bottom: 16px;
}
.page-about-origin-copy .btn {
  margin-top: 8px;
}
.page-about-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  padding: 24px 0;
  margin: 28px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about-fact .metric {
  display: block;
  font-family: var(--font-data);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--grass);
  line-height: 1.1;
  margin-bottom: 4px;
}
.page-about-fact span:last-child {
  font-size: 0.78rem;
  opacity: 0.72;
}

/* 图片 */
.page-about-media {
  margin: 0;
  position: relative;
}
.page-about-media::before {
  content: "";
  position: absolute;
  inset: 10px 10px 0 0;
  border: 2px solid var(--line);
  z-index: 0;
  pointer-events: none;
}
.page-about-media img {
  position: relative;
  width: 100%;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border: 1px solid var(--ink);
  z-index: 1;
}
.page-about-media figcaption {
  position: relative;
  display: inline-block;
  margin-top: 12px;
  font-size: 0.78rem;
  letter-spacing: 0.03em;
  color: var(--ink);
  z-index: 1;
}
.page-about-media figcaption::before {
  content: "◆ ";
  color: var(--gold);
}

/* 里程碑 */
.page-about-milestones {
  padding: 64px 0;
  background:
    linear-gradient(rgba(18,18,18,0.03) 1px, transparent 1px),
    linear-gradient(90deg, rgba(18,18,18,0.03) 1px, transparent 1px),
    var(--paper-warm);
  background-size: 36px 36px;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about-timeline {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
}
.page-about-timeline-item {
  position: relative;
  padding: 0 0 44px 64px;
}
.page-about-timeline-item::before {
  content: "";
  position: absolute;
  left: 33px;
  top: 10px;
  bottom: -2px;
  width: 2px;
  background: var(--line);
}
.page-about-timeline-item:last-child::before {
  display: none;
}
.page-about-timeline-year {
  position: absolute;
  left: 0;
  top: 0;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 60px;
  height: 24px;
  font-family: var(--font-data);
  font-size: 12px;
  font-weight: 700;
  color: var(--paper);
  background: var(--ink);
  letter-spacing: 0.06em;
  transition: background 0.3s ease;
}
.page-about-timeline-year::after {
  content: "";
  position: absolute;
  right: -10px;
  top: 50%;
  width: 8px;
  height: 8px;
  transform: translateY(-50%) rotate(45deg);
  background: var(--gold);
  border: 1px solid var(--ink);
}
.page-about-timeline-card {
  background: var(--paper);
  border: 1px solid var(--line);
  padding: 18px 20px 16px;
  box-shadow: var(--shadow-paper);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.page-about-timeline-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin: 8px 0 8px;
  line-height: 1.35;
}
.page-about-timeline-card p {
  font-size: 0.9rem;
  line-height: 1.7;
  margin-bottom: 4px;
}
.page-about-timeline-extra {
  margin-top: 10px;
  padding-top: 8px;
  border-top: 1px dashed var(--line);
  font-family: var(--font-data);
  font-size: 0.76rem;
  color: var(--grass-deep);
}
.page-about-timeline-item:hover .page-about-timeline-card,
.page-about-timeline-item:focus-visible .page-about-timeline-card {
  transform: translateX(6px);
  box-shadow: 12px 12px 0 rgba(18,18,18,0.08);
}
.page-about-timeline-item:hover .page-about-timeline-year,
.page-about-timeline-item:focus-visible .page-about-timeline-year {
  background: var(--grass);
}
.page-about .tag {
  background: var(--mint);
  color: var(--grass-deep);
  font-size: 0.68rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  border: 1px solid transparent;
}
.page-about-timeline-figure {
  margin: 32px 0 0;
}
.page-about-timeline-figure img {
  width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  border: 1px solid var(--line);
}
.page-about-timeline-figure figcaption {
  margin-top: 8px;
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--ink);
  opacity: 0.65;
}

/* 使命与愿景 */
.page-about-mission {
  padding: 64px 0;
  color: var(--paper-warm);
  background:
    linear-gradient(135deg, rgba(212,160,41,0.12), rgba(11,122,62,0.22)),
    var(--blue-deep);
}
.page-about-mission .eyebrow {
  color: var(--gold);
}
.page-about-mission h2 {
  color: #fff;
  margin: 8px 0 0;
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.2vw, 2.6rem);
  line-height: 1.12;
}
.page-about-mission blockquote {
  margin: 32px 0;
  padding: 28px 0;
  border-top: 1px solid rgba(255,255,255,0.25);
  border-bottom: 1px solid rgba(255,255,255,0.25);
}
.page-about-mission blockquote p {
  font-family: var(--font-display);
  font-size: clamp(1.6rem, 4.5vw, 2.8rem);
  line-height: 1.2;
  color: #fff;
  max-width: 900px;
  margin: 0;
}
.page-about-mission-value h3 {
  color: var(--gold);
  font-family: var(--font-display);
  font-size: 1rem;
  letter-spacing: 0.08em;
  margin-bottom: 8px;
}
.page-about-mission-value p {
  font-size: 0.88rem;
  line-height: 1.7;
  opacity: 0.88;
  margin-bottom: 0;
}
.page-about-mission .btn-ghost {
  border-color: var(--gold);
  color: var(--gold);
  margin-top: 8px;
}
.page-about-mission .btn-ghost:hover {
  background: rgba(212,160,41,0.15);
}

/* 2026 更新 */
.page-about-update {
  padding: 64px 0;
  background: linear-gradient(160deg, var(--mint) 0%, var(--paper) 58%);
}
.page-about-update .page-lead {
  max-width: 720px;
  margin-top: 12px;
  font-size: 1rem;
  line-height: 1.7;
}
.page-about-update-grid {
  margin-top: 24px;
}
.page-about-update-card {
  position: relative;
  background: var(--paper-warm);
  border: 1px solid var(--line);
  padding: 28px 24px 24px;
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}
.page-about-update-card:hover {
  transform: translateY(-6px);
  box-shadow: 10px 10px 0 rgba(18,18,18,0.06);
}
.page-about-update-num {
  display: block;
  font-family: var(--font-data);
  font-size: 1.4rem;
  font-weight: 700;
  color: var(--gold);
  margin-bottom: 12px;
}
.page-about-update-card h3 {
  font-family: var(--font-display);
  font-size: 1.05rem;
  margin-bottom: 8px;
}
.page-about-update-card p {
  font-size: 0.92rem;
  line-height: 1.7;
  margin-bottom: 0;
}

/* 团队 */
.page-about-team {
  padding: 64px 0;
  background: var(--paper);
  border-top: 1px solid var(--line);
}
.page-about-team-figure {
  margin: 0;
}
.page-about-team-figure img {
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  border: 1px solid var(--line);
}
.page-about-team-figure figcaption {
  margin-top: 8px;
  font-size: 0.75rem;
  color: var(--ink);
  opacity: 0.65;
}
.page-about-team-copy p {
  font-size: 1rem;
  line-height: 1.8;
  margin-bottom: 16px;
}
.page-about-team-facts {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 10px;
  margin: 24px 0;
  padding: 18px 0;
  border-top: 1px solid var(--line);
  border-bottom: 1px solid var(--line);
}
.page-about-team-fact .metric {
  display: block;
  font-family: var(--font-data);
  font-size: 1.7rem;
  font-weight: 700;
  color: var(--grass);
  line-height: 1.1;
  margin-bottom: 4px;
}
.page-about-team-fact span:last-child {
  font-size: 0.78rem;
  opacity: 0.72;
}
.page-about-team-copy .btn {
  margin-top: 8px;
}

/* 底部导航 */
.page-about-footer-nav {
  padding: 36px 0 56px;
  border-top: 1px solid var(--line);
  background: var(--paper-warm);
}
.page-about-footer-nav a {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-data);
  font-weight: 700;
  color: var(--ink);
  text-decoration: none;
  letter-spacing: 0.04em;
}
.page-about-footer-nav a::before {
  content: "← ";
  color: var(--grass);
}
.page-about-footer-nav a:hover {
  color: var(--grass);
}

/* 桌面端 */
@media (min-width: 900px) {
  .page-about .grid-2 {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .grid-3 {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about-hero {
    padding: 72px 0 80px;
  }
  .page-about-hero .display-title {
    font-size: clamp(2.8rem, 6vw, 4.5rem);
  }
  .page-about-origin,
  .page-about-milestones,
  .page-about-mission,
  .page-about-update,
  .page-about-team {
    padding: 104px 0;
  }
  .page-about-chapter {
    gap: 16px 24px;
  }
  .page-about-timeline-item {
    padding-left: 112px;
  }
  .page-about-timeline-year {
    width: 88px;
    height: 30px;
    font-size: 15px;
  }
  .page-about-timeline-item::before {
    left: 45px;
  }
  .page-about-timeline-card {
    max-width: 680px;
  }
  .page-about-timeline-card h3 {
    font-size: 1.2rem;
  }
  .page-about-media {
    margin: 0;
  }
  .page-about-media::before {
    inset: 14px 14px 0 0;
  }
  .page-about-mission-values {
    gap: 32px;
  }
  .page-about-footer-nav {
    padding: 48px 0 72px;
  }
}