.page-about {
  --about-rail: 74px;
  background:
    radial-gradient(900px 520px at 88% -6%, rgba(22, 62, 102, 0.6), transparent 68%),
    radial-gradient(700px 420px at -8% 44%, rgba(43, 214, 176, 0.08), transparent 70%),
    var(--void);
  color: var(--mist);
  overflow-x: hidden;
  padding-bottom: clamp(30px, 5vw, 60px);
}

.page-about__crumbs {
  padding-top: clamp(14px, 3vw, 24px);
}

.page-about h1,
.page-about .page-about__h2 {
  font-family: var(--sans);
  font-weight: 800;
  letter-spacing: -0.02em;
  line-height: 1.16;
  margin: 0;
}

.page-about h1 {
  font-size: clamp(30px, 6.4vw, 56px);
}

.page-about .page-about__h2 {
  font-size: clamp(21px, 3.6vw, 33px);
}

.page-about .page-about__text {
  margin: 0;
  font-size: clamp(15px, 1.6vw, 17px);
  line-height: 1.8;
  color: var(--mist);
}

.page-about .page-about__link {
  color: var(--orange-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 160, 107, 0.5);
  padding-bottom: 2px;
  transition: color 0.18s var(--ease), border-color 0.18s var(--ease);
}

.page-about .page-about__link:hover,
.page-about .page-about__link:focus-visible {
  color: var(--teal);
  border-color: var(--teal);
}

.page-about .page-about__link:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
}

/* ---------- 首屏 ---------- */
.page-about .page-about__hero {
  padding: clamp(20px, 4vw, 44px) 0 clamp(34px, 6vw, 76px);
}

.page-about .page-about__hero-grid {
  display: grid;
  gap: clamp(24px, 4vw, 48px);
  align-items: end;
}

.page-about .page-about__hero-copy {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
}

.page-about .page-about__hero-copy .lead {
  margin: 0;
  color: var(--mist);
}

.page-about .page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .page-about__chips {
  list-style: none;
  margin: clamp(4px, 1vw, 10px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .page-about__chips li {
  padding: 6px 13px;
  border: 1px solid var(--hair);
  border-radius: 999px;
  background: rgba(12, 38, 68, 0.55);
  font-size: 13px;
  color: var(--line);
}

.page-about .page-about__chips .mono {
  color: var(--teal);
  font-size: 13.5px;
}

.page-about .page-about__hero-figure {
  margin: 0;
  position: relative;
  overflow: hidden;
  border: 1px solid var(--hair);
  background: linear-gradient(160deg, rgba(22, 62, 102, 0.7), rgba(7, 26, 51, 0.92));
  clip-path: polygon(0 0, 100% 0, 100% 100%, 9% 100%, 0 86%);
}

.page-about .page-about__hero-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  aspect-ratio: 16 / 9;
}

.page-about .page-about__hero-figure .media__caption {
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0;
  padding: 26px 18px 14px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--mist);
  background: linear-gradient(180deg, transparent, rgba(7, 26, 51, 0.92));
}

/* ---------- 章节轨 ---------- */
.page-about .page-about__chapter {
  padding: clamp(30px, 5vw, 64px) 0;
  border-top: 1px solid var(--hair-soft);
}

.page-about .page-about__chapter-grid {
  display: grid;
  gap: 12px;
}

.page-about .page-about__rail {
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .page-about__rail-num {
  font-size: 21px;
  letter-spacing: 0.08em;
  color: var(--teal);
}

.page-about .page-about__rail-hint {
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--line);
}

.page-about .page-about__body {
  display: grid;
  gap: clamp(16px, 2.6vw, 24px);
  min-width: 0;
}

/* ---------- 三项价值 ---------- */
.page-about .page-about__values {
  display: grid;
  gap: 14px;
}

.page-about .page-about__value {
  display: grid;
  gap: 8px;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--hair);
  border-radius: var(--radius-cut);
  background: var(--glass-bg);
  transition: background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .page-about__value:hover {
  background: var(--glass-bg-hover);
  transform: translateY(-2px);
}

.page-about .page-about__value h3 {
  margin: 0;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
}

.page-about .page-about__value p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .page-about__value-num {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange-soft);
}

.page-about .page-about__value--feature {
  background: var(--paper);
  border-color: transparent;
  color: var(--ink);
  clip-path: polygon(0 0, 100% 0, 100% calc(100% - 20px), calc(100% - 20px) 100%, 0 100%);
}

.page-about .page-about__value--feature:hover {
  background: var(--paper);
}

.page-about .page-about__value--feature p {
  color: var(--ink);
}

.page-about .page-about__value--feature .page-about__value-num {
  color: #B5451A;
}

.page-about .page-about__value-note {
  font-size: 13px;
  color: #4A463E;
  border-top: 1px solid rgba(10, 15, 22, 0.16);
  padding-top: 8px;
}

/* ---------- 内容运营 ---------- */
.page-about .page-about__ops {
  display: grid;
  gap: clamp(16px, 3vw, 28px);
  min-width: 0;
}

.page-about .page-about__paper {
  display: grid;
  gap: 14px;
  padding: clamp(20px, 3.6vw, 40px);
  background: var(--paper);
  color: var(--ink);
  border-radius: var(--radius-cut);
  min-width: 0;
}

.page-about .page-about__paper .page-about__h2 {
  color: var(--ink);
}

.page-about .page-about__paper .page-about__text {
  color: var(--ink);
}

.page-about .page-about__flow {
  list-style: none;
  margin: 4px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .page-about__flow-item {
  display: grid;
  grid-template-columns: 32px minmax(0, 1fr);
  gap: 10px;
  padding-top: 12px;
  border-top: 1px solid rgba(10, 15, 22, 0.18);
}

.page-about .page-about__flow-item:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .page-about__flow-num {
  font-size: 13px;
  padding-top: 3px;
  color: #B5451A;
}

.page-about .page-about__flow-item h3 {
  margin: 0 0 4px;
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .page-about__flow-item p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink);
}

.page-about .page-about__ops-figure {
  margin: 0;
  border: 1px solid var(--hair);
  border-radius: var(--radius-cut);
  overflow: hidden;
  background: rgba(12, 38, 68, 0.5);
}

.page-about .page-about__ops-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .page-about__ops-figure .media__caption {
  padding: 10px 14px 12px;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--line);
}

/* ---------- 时间线 ---------- */
.page-about .page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 24px;
  position: relative;
  display: grid;
  gap: 14px;
}

.page-about .page-about__timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--orange), rgba(43, 214, 176, 0.55));
}

.page-about .page-about__node {
  position: relative;
  min-width: 0;
}

.page-about .page-about__node::before {
  content: "";
  position: absolute;
  left: -24px;
  top: 18px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--void);
  border: 2px solid var(--teal);
}

.page-about .page-about__ver {
  border: 1px solid var(--hair);
  border-radius: 12px 12px 12px 3px;
  background: var(--glass-bg);
  transition: background 0.2s var(--ease);
}

.page-about .page-about__ver[open] {
  background: var(--glass-bg-hover);
}

.page-about .page-about__ver > summary {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: 70px minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  min-height: 48px;
  padding: 12px 14px;
}

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

.page-about .page-about__ver > summary:focus-visible {
  outline: 2px solid var(--teal);
  outline-offset: 3px;
  border-radius: 12px;
}

.page-about .page-about__ver-ver {
  font-size: 13.5px;
  letter-spacing: 0.04em;
  color: var(--orange);
}

.page-about .page-about__ver-title {
  font-size: 15px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--mist);
}

.page-about .page-about__ver-mark {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--line);
  transition: background 0.18s var(--ease);
}

.page-about .page-about__ver[open] .page-about__ver-mark {
  background: var(--teal);
}

.page-about .page-about__ver-body {
  margin: 0;
  padding: 0 14px 14px;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--mist);
}

/* ---------- 团队 ---------- */
.page-about .page-about__team {
  display: grid;
  gap: 14px;
  padding: clamp(18px, 3vw, 26px);
  border: 1px solid var(--hair);
  border-radius: var(--radius-cut);
  background: rgba(12, 38, 68, 0.5);
}

.page-about .page-about__team-row {
  display: grid;
  gap: 7px;
}

.page-about .page-about__team-meta {
  display: flex;
  justify-content: space-between;
  gap: 12px;
  font-size: 13.5px;
  color: var(--mist);
}

.page-about .page-about__team-meta .mono {
  color: var(--orange-soft);
}

.page-about .page-about__track {
  height: 10px;
  border-radius: 999px;
  background: rgba(139, 163, 186, 0.18);
  overflow: hidden;
}

.page-about .page-about__bar {
  display: block;
  height: 100%;
  border-radius: 999px;
}

.page-about .page-about__bar--content {
  width: 58%;
  background: var(--orange);
}

.page-about .page-about__bar--tech {
  width: 25%;
  background: var(--teal);
}

.page-about .page-about__bar--support {
  width: 17%;
  background: var(--line);
}

.page-about .page-about__team-figure {
  margin: 0;
  border: 1px solid var(--hair);
  border-radius: var(--radius-cut);
  overflow: hidden;
}

.page-about .page-about__team-figure .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .page-about__team-figure .media__caption {
  padding: 10px 14px 12px;
  font-size: 12.5px;
  color: var(--line);
}

/* ---------- 数据 ---------- */
.page-about .page-about__stats {
  display: grid;
  gap: 12px;
}

.page-about .page-about__stat {
  padding: 16px 18px;
  border: 1px solid var(--hair);
  border-radius: 12px 12px 12px 3px;
  background: rgba(12, 38, 68, 0.55);
  display: grid;
  gap: 4px;
}

.page-about .page-about__stat .mono {
  font-size: 26px;
  line-height: 1.1;
  color: var(--orange);
}

.page-about .page-about__stat span:last-child {
  font-size: 13px;
  color: var(--line);
}

/* ---------- 收尾 ---------- */
.page-about .page-about__closing {
  padding: clamp(30px, 5vw, 60px) 0 0;
}

.page-about .page-about__cta {
  display: grid;
  gap: clamp(14px, 2.4vw, 20px);
  padding: clamp(22px, 4vw, 40px);
  border: 1px solid var(--hair);
  border-radius: var(--radius-cut);
  background: linear-gradient(135deg, rgba(255, 106, 43, 0.18), rgba(22, 62, 102, 0.5) 55%, rgba(7, 26, 51, 0.72));
}

.page-about .page-about__contact {
  display: flex;
  flex-wrap: wrap;
  gap: 10px 22px;
  font-size: 13.5px;
}

.page-about .page-about__contact-item {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  min-height: 44px;
  color: var(--mist);
}

.page-about .page-about__contact-item .mono {
  color: var(--teal);
  word-break: break-all;
}

.page-about .page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .page-about__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 840px) {
  .page-about .page-about__values {
    grid-template-columns: 1.2fr 0.9fr 0.9fr;
    align-items: start;
  }
}

@media (min-width: 860px) {
  .page-about .page-about__chapter-grid {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(20px, 4vw, 46px);
  }

  .page-about .page-about__rail {
    position: sticky;
    top: 104px;
    align-self: start;
    flex-direction: column;
    gap: 8px;
    padding-left: 14px;
    border-left: 1px solid var(--hair);
  }

  .page-about .page-about__rail-hint {
    opacity: 0;
    transform: translateX(-4px);
    transition: opacity 0.18s var(--ease), transform 0.18s var(--ease);
  }

  .page-about .page-about__rail:hover .page-about__rail-hint,
  .page-about .page-about__rail:focus-within .page-about__rail-hint {
    opacity: 1;
    transform: none;
  }
}

@media (min-width: 900px) {
  .page-about .page-about__hero-grid {
    grid-template-columns: minmax(0, 1.04fr) minmax(0, 0.96fr);
  }

  .page-about .page-about__ops {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .page-about__team-figure {
    justify-self: start;
    max-width: 620px;
  }
}

@media (min-width: 980px) {
  .page-about .page-about__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .page-about__value,
  .page-about .page-about__ver,
  .page-about .page-about__rail-hint {
    transition: none;
  }

  .page-about .page-about__value:hover {
    transform: none;
  }
}