.page-about {
  background: var(--paper);
  color: var(--ink);
  overflow-x: hidden;
}

/* ---------- 面包屑 ---------- */
.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  padding-top: clamp(18px, 3vw, 30px);
  font-size: 13px;
  letter-spacing: .08em;
  color: var(--muted);
}
.page-about .breadcrumb a {
  color: var(--muted);
  text-decoration: none;
  transition: color .2s ease;
}
.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--orange-ink);
}
.page-about .breadcrumb [aria-current="page"] {
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-block: clamp(24px, 4vw, 44px) clamp(34px, 6vw, 74px);
  overflow: hidden;
}
.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -20%;
  right: -16%;
  width: min(700px, 74vw);
  height: 152%;
  background: linear-gradient(158deg, var(--green) 0%, var(--green-2) 100%);
  clip-path: polygon(38% 0%, 100% 0%, 100% 100%, 0% 100%);
  border-radius: 0 0 0 72px;
  opacity: .07;
  pointer-events: none;
}
.page-about .about-hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(30px, 5vw, 56px);
}
.page-about .about-hero-main .eyebrow {
  margin: 0 0 clamp(14px, 2vw, 20px);
  color: var(--orange-ink);
}
.page-about .about-hero-main h1 {
  margin: 0;
}
.page-about .about-hero-main .lede {
  margin: clamp(18px, 2.5vw, 26px) 0 0;
  max-width: 38em;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

.page-about .hero-facts {
  display: grid;
  border-top: 2px solid var(--green);
}
.page-about .fact {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 13px 2px;
  border-bottom: 1px solid var(--line);
}
.page-about .fact-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(1.35rem, 3vw, 1.7rem);
  line-height: 1.1;
  letter-spacing: -.01em;
  color: var(--green);
  white-space: nowrap;
}
.page-about .fact-label {
  font-size: 13px;
  line-height: 1.5;
  text-align: right;
  color: var(--muted);
}

@media (min-width: 1000px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(280px, 4fr);
    align-items: start;
  }
  .page-about .hero-facts {
    margin-top: clamp(24px, 3vw, 44px);
  }
}

/* ---------- 竖向时间轴骨架 ---------- */
.page-about .about-timeline {
  position: relative;
  padding-bottom: clamp(28px, 5vw, 56px);
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 2px;
  background: linear-gradient(180deg, rgba(255, 106, 19, .72) 0%, rgba(255, 106, 19, .32) 34%, var(--line-strong) 100%);
}
.page-about .tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: clamp(14px, 3vw, 32px);
  padding-block: clamp(30px, 5vw, 56px);
}
.page-about .tl-mark {
  position: relative;
  padding-left: 22px;
  padding-top: 2px;
}
.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: .5rem;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 19, .12);
  transition: box-shadow .45s ease, transform .45s ease;
}
.page-about .tl-item.is-visible .tl-dot {
  box-shadow: 0 0 0 7px rgba(255, 106, 19, .18);
}
.page-about .tl-index {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  line-height: 1.2;
  letter-spacing: 0;
  color: var(--orange-ink);
}
.page-about .tl-label {
  display: block;
  margin-top: 4px;
  font-size: 11px;
  line-height: 1.4;
  letter-spacing: .1em;
  color: var(--muted);
}
.page-about .tl-body {
  min-width: 0;
}
.page-about .tl-body .section-title {
  margin: 0 0 clamp(14px, 2vw, 20px);
}
.page-about .tl-body .prose {
  max-width: 38em;
}
.page-about .tl-body .prose p + p {
  margin-top: 1em;
}
.page-about .tl-body .prose a {
  color: var(--blue);
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}
.page-about .tl-body .prose a:hover,
.page-about .tl-body .prose a:focus-visible {
  color: var(--orange-ink);
}

@media (min-width: 1024px) {
  .page-about .about-timeline::before {
    top: 16px;
    bottom: 16px;
  }
  .page-about .tl-item {
    grid-template-columns: 132px minmax(0, 1fr);
    gap: clamp(24px, 4vw, 56px);
    padding-block: clamp(40px, 6vw, 72px);
  }
  .page-about .tl-mark {
    padding-left: 24px;
    padding-top: 4px;
  }
  .page-about .tl-dot {
    top: .55rem;
    width: 14px;
    height: 14px;
  }
  .page-about .tl-index {
    font-size: 15px;
  }
  .page-about .tl-label {
    margin-top: 6px;
    font-size: 12px;
  }
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3.5vw, 36px) 0 0;
}
.page-about .about-figure .media-frame {
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) var(--r-sm);
  overflow: hidden;
  background: var(--blue-mist);
}
.page-about .about-figure figcaption {
  margin-top: 10px;
  font-size: 13px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--muted);
}

/* ---------- 流程折叠组 ---------- */
.page-about .flow-accordion {
  display: grid;
  gap: 10px;
  margin-top: clamp(20px, 3vw, 30px);
}
.page-about .flow-heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}
.page-about .flow-trigger {
  display: flex;
  align-items: center;
  gap: clamp(12px, 2vw, 18px);
  width: 100%;
  padding: clamp(13px, 2vw, 18px) clamp(14px, 2.5vw, 22px);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  text-align: left;
  font: inherit;
  color: inherit;
  cursor: pointer;
  transition: border-color .22s ease, box-shadow .22s ease;
}
.page-about .flow-trigger:hover {
  border-color: rgba(255, 106, 19, .6);
}
.page-about .flow-trigger:focus-visible {
  outline: 2px solid var(--blue);
  outline-offset: 2px;
}
.page-about .flow-trigger[aria-expanded="true"] {
  border-color: var(--orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 19, .14);
}
.page-about .flow-num {
  flex: none;
  display: grid;
  place-items: center;
  width: 38px;
  height: 38px;
  border-radius: 50%;
  background: var(--orange);
  color: #fff;
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 600;
  line-height: 1;
}
.page-about .flow-name {
  flex: 1 1 auto;
  min-width: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  font-weight: 600;
  line-height: 1.55;
  color: var(--ink);
}
.page-about .flow-panel {
  max-width: 44em;
  padding: 12px clamp(14px, 2.5vw, 22px) clamp(16px, 2.5vw, 22px);
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink);
}
.page-about .flow-panel p {
  margin: 0;
}

/* ---------- 更新安排表 ---------- */
.page-about .table-wrap {
  margin-top: clamp(20px, 3vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) var(--r-sm);
  overflow: hidden;
  background: var(--card);
}
.page-about .table-wrap + .prose {
  margin-top: clamp(16px, 2.5vw, 24px);
}
.page-about .visually-hidden {
  position: absolute;
  width: 1px;
  height: 1px;
  margin: -1px;
  padding: 0;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

/* ---------- 团队数据 ---------- */
.page-about .team-stats {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}
.page-about .team-stat {
  padding: clamp(18px, 2.6vw, 26px);
  background: var(--card);
  border: 1px solid var(--line);
  border-radius: var(--r-lg) var(--r-lg) var(--r-lg) var(--r-sm);
  box-shadow: var(--shadow-card);
}
.page-about .team-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(2rem, 4.5vw, 2.6rem);
  font-weight: 600;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--green);
}
.page-about .team-label {
  display: block;
  margin-top: 10px;
  font-size: 15px;
  font-weight: 600;
  color: var(--ink);
}
.page-about .team-desc {
  display: block;
  margin-top: 8px;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--muted);
}

@media (min-width: 640px) {
  .page-about .team-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- 收尾条 ---------- */
.page-about .about-outro {
  position: relative;
  margin-top: clamp(20px, 4vw, 40px);
  margin-bottom: clamp(40px, 7vw, 88px);
  padding: clamp(28px, 4.5vw, 52px) clamp(20px, 3.5vw, 44px);
  background: linear-gradient(140deg, var(--green) 0%, var(--green-2) 100%);
  border-radius: var(--r-xl) var(--r-xl) var(--r-xl) var(--r-md);
  color: #fff;
  overflow: hidden;
}
.page-about .about-outro::after {
  content: "";
  position: absolute;
  right: -50px;
  bottom: -70px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: rgba(255, 106, 19, .22);
  pointer-events: none;
}
.page-about .about-outro h2 {
  position: relative;
  margin: 0;
  font-size: clamp(1.3rem, 2.6vw, 1.85rem);
  font-weight: 600;
  line-height: 1.45;
  color: #fff;
}
.page-about .about-outro p {
  position: relative;
  margin: 14px 0 0;
  max-width: 36em;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(255, 255, 255, .84);
}
.page-about .about-outro .outro-actions {
  position: relative;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 28px);
}
.page-about .about-outro .btn--ghost {
  color: #fff;
  border-color: rgba(255, 255, 255, .55);
}
.page-about .about-outro .btn--ghost:hover,
.page-about .about-outro .btn--ghost:focus-visible {
  border-color: #fff;
  background: rgba(255, 255, 255, .12);
}

@media (min-width: 768px) {
  .page-about .flow-panel {
    padding-left: calc(clamp(14px, 2.5vw, 22px) + 38px + clamp(12px, 2vw, 18px));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-dot,
  .page-about .flow-trigger {
    transition: none;
  }
}
</main>