.page-about {
  --about-line: rgba(11, 31, 51, .13);
  --about-glass: rgba(255, 255, 255, .62);
  --about-ink-line: rgba(247, 243, 234, .18);
  display: block;
  color: var(--ink);
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding-top: clamp(22px, 4vw, 46px);
  padding-bottom: clamp(30px, 5vw, 58px);
  background:
    radial-gradient(120% 95% at 6% 0%, rgba(95, 158, 143, .16), transparent 58%),
    radial-gradient(95% 80% at 94% 4%, rgba(200, 162, 74, .18), transparent 60%);
  border-bottom: 1px solid var(--about-line);
}

.page-about .about-hero .breadcrumb {
  margin-bottom: clamp(18px, 3vw, 30px);
}

.page-about .about-hero h1 {
  font-family: var(--font-head);
  font-size: clamp(30px, 6.2vw, 62px);
  line-height: 1.12;
  letter-spacing: -.01em;
  margin: 10px 0 0;
  max-width: 20ch;
}

.page-about .about-hero .lede {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.6vw, 18.5px);
  line-height: 1.85;
  color: var(--graphite);
  max-width: 62ch;
  margin: 18px 0 0;
}

.page-about .about-stats {
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 10px;
}

.page-about .about-stats li {
  padding: 14px 16px 16px;
  border-radius: var(--r-md);
  border: 1px solid rgba(200, 162, 74, .28);
  background: linear-gradient(158deg, var(--ink-2), var(--ink) 78%);
  box-shadow: var(--shadow-1);
}

.page-about .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(22px, 3.4vw, 32px);
  line-height: 1.1;
  color: var(--gold-soft);
  letter-spacing: -.02em;
}

.page-about .stat-label {
  display: block;
  margin-top: 6px;
  font-size: 13px;
  letter-spacing: .04em;
  color: rgba(247, 243, 234, .74);
}

.page-about .about-paths {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-hero__media {
  margin-top: clamp(26px, 4.5vw, 44px);
}

.page-about .about-hero__figure {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  box-shadow: var(--shadow-2);
  aspect-ratio: 12 / 7;
  background: linear-gradient(150deg, var(--ink-2), var(--ink));
}

.page-about .media-frame__image {
  display: block;
  width: 100%;
  height: 100%;
  max-width: 100%;
  object-fit: cover;
}

.page-about .media-frame__caption {
  display: block;
  margin: 0;
  padding: 10px 2px 0;
  font-size: 13px;
  color: var(--graphite);
  letter-spacing: .02em;
}

/* ---------- 编号章节外壳 ---------- */
.page-about .chapter {
  padding: clamp(38px, 6.5vw, 76px) 0;
  border-bottom: 1px solid var(--about-line);
}

.page-about .chapter__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(16px, 3vw, 30px);
}

.page-about .chapter__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(52px, 11vw, 96px);
  line-height: .82;
  letter-spacing: -.03em;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--gold);
}

.page-about .chapter__label {
  display: block;
  margin-top: 12px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .16em;
  color: var(--celadon);
}

.page-about .chapter__body h2 {
  font-family: var(--font-head);
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.2;
  margin: 0 0 16px;
  max-width: 24ch;
}

.page-about .chapter__body h3 {
  font-family: var(--font-head);
  font-size: clamp(18px, 2vw, 21px);
  line-height: 1.4;
  margin: 0 0 10px;
}

.page-about .chapter__body p {
  font-family: var(--font-body);
  font-size: clamp(16px, 1.55vw, 17.5px);
  line-height: 1.85;
  color: var(--graphite);
  margin: 0 0 16px;
  max-width: 64ch;
}

.page-about .chapter__body p:last-child {
  margin-bottom: 0;
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline-figure {
  margin: 24px 0 30px;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  aspect-ratio: 8 / 3;
  background: linear-gradient(120deg, var(--ink-2), var(--ink));
}

.page-about .about-timeline-figure .media-frame__caption,
.page-about .about-eco-figure .media-frame__caption {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0 0 0 0);
  white-space: nowrap;
  border: 0;
}

.page-about .tl {
  list-style: none;
  margin: 8px 0 0;
  padding: 0 0 0 26px;
  position: relative;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 12px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--gold), var(--celadon) 58%, var(--electric));
}

.page-about .tl__item {
  position: relative;
  padding: 0 0 26px;
  border-radius: var(--r-sm);
  transition: transform .28s var(--ease);
}

.page-about .tl__item:last-child {
  padding-bottom: 0;
}

.page-about .tl__dot {
  position: absolute;
  left: -26px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--warm);
  border: 2px solid var(--gold);
  transition: background .25s var(--ease), box-shadow .25s var(--ease), border-color .25s var(--ease);
}

.page-about .tl__item:hover .tl__dot,
.page-about .tl__item:focus-visible .tl__dot,
.page-about .tl__item:focus-within .tl__dot {
  background: var(--electric);
  border-color: var(--electric);
  box-shadow: 0 0 0 5px rgba(43, 217, 200, .18);
}

.page-about .tl__item:hover,
.page-about .tl__item:focus-visible {
  transform: translateX(3px);
}

.page-about .tl__item:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 6px;
}

.page-about .tl__meta {
  margin: 0 0 8px;
  font-size: 13px;
}

.page-about .tl__title {
  margin: 0 0 6px;
}

.page-about .tl__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  max-width: 60ch;
}

.page-about .tl__hint {
  display: inline-block;
  margin: 10px 0 0;
  padding-bottom: 2px;
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .05em;
  color: var(--ink-2);
  border-bottom: 2px solid transparent;
  transition: border-color .25s var(--ease), color .25s var(--ease);
}

.page-about .tl__item:hover .tl__hint,
.page-about .tl__item:focus-visible .tl__hint {
  border-color: var(--gold);
  color: var(--ink);
}

/* ---------- 三条主线 ---------- */
.page-about .lines {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 26px 0 0;
}

.page-about .line-card {
  position: relative;
  padding: 22px 20px 20px 24px;
  border-radius: var(--r-md);
  background: #fff;
  border: 1px solid var(--about-line);
  box-shadow: var(--shadow-1);
  transition: transform .28s var(--ease), box-shadow .28s var(--ease);
}

.page-about .line-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  border-radius: 3px;
  background: var(--gold);
}

.page-about .line-card--celadon::before {
  background: var(--celadon);
}

.page-about .line-card--violet::before {
  background: var(--violet);
}

.page-about .line-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-2);
}

.page-about .line-card .card__index {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--gold);
  margin-bottom: 8px;
}

.page-about .line-card--celadon .card__index {
  color: var(--celadon);
}

.page-about .line-card--violet .card__index {
  color: var(--violet);
}

.page-about .line-card .card__title {
  margin: 0 0 8px;
}

.page-about .line-card .card__text {
  margin: 0;
  font-size: 16px;
  line-height: 1.82;
  max-width: 44ch;
}

.page-about .about-versions {
  list-style: none;
  margin: 30px 0 0;
  padding: 16px 18px;
  display: flex;
  flex-wrap: wrap;
  gap: 14px 28px;
  border-radius: var(--r-md);
  border: 1px solid var(--glass-line);
  background: var(--about-glass);
  backdrop-filter: blur(8px);
}

.page-about .about-versions__item {
  display: flex;
  align-items: baseline;
  gap: 10px;
  min-width: 0;
}

.page-about .about-versions__label {
  font-size: 13px;
  color: var(--graphite);
  letter-spacing: .03em;
}

.page-about .copyable {
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--ink);
  border-bottom: 1px dashed var(--gold);
  cursor: pointer;
}

.page-about .copyable:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
  border-radius: 2px;
}

.page-about .about-versions__note {
  font-size: 13px;
  color: var(--graphite);
  margin: 10px 0 0;
}

/* ---------- 合作生态 ---------- */
.page-about .eco {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3.5vw, 42px);
  margin-top: 26px;
  align-items: start;
}

.page-about .eco-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .eco-list li {
  display: grid;
  grid-template-columns: minmax(64px, auto) minmax(0, 1fr);
  gap: 14px;
  align-items: baseline;
  padding: 13px 16px;
  border-radius: var(--r-sm);
  border: 1px solid var(--about-line);
  background: #fff;
}

.page-about .eco-list__num {
  font-family: var(--font-mono);
  font-size: 20px;
  line-height: 1.1;
  color: var(--gold);
  letter-spacing: -.01em;
}

.page-about .eco-list__label {
  font-size: 15px;
  line-height: 1.65;
  color: var(--graphite);
}

.page-about .about-eco-figure {
  margin: 0;
  position: relative;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-line);
  aspect-ratio: 3 / 2;
  background: linear-gradient(150deg, var(--ink-3), var(--ink));
}

/* ---------- 团队与服务 ---------- */
.page-about .team-panel {
  margin-top: 26px;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  border-radius: var(--r-lg);
  overflow: hidden;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .team-panel__block {
  padding: clamp(20px, 3vw, 30px);
  background: #fff;
}

.page-about .team-panel__block--contact {
  background: linear-gradient(158deg, var(--ink-2), var(--ink) 80%);
}

.page-about .team-panel__title {
  margin: 0 0 14px;
  font-size: 18px;
}

.page-about .team-panel__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 11px;
}

.page-about .team-panel__list li {
  position: relative;
  padding-left: 18px;
  font-size: 15.5px;
  line-height: 1.7;
  color: var(--graphite);
}

.page-about .team-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--celadon);
}

.page-about .team-panel__block--contact .team-panel__title {
  color: var(--warm);
}

.page-about .team-panel__line {
  margin: 0 0 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 6px 12px;
  align-items: baseline;
  font-size: 15px;
}

.page-about .team-panel__label {
  font-family: var(--font-mono);
  font-size: 12.5px;
  letter-spacing: .08em;
  color: var(--electric);
  min-width: 72px;
}

.page-about .team-panel__value {
  color: rgba(247, 243, 234, .92);
  text-decoration: none;
  border-bottom: 1px solid rgba(247, 243, 234, .28);
}

.page-about a.team-panel__value:hover {
  border-bottom-color: var(--gold);
}

.page-about a.team-panel__value:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
}

.page-about .team-panel__btn {
  margin-top: 16px;
}

/* ---------- 下一步计划 ---------- */
.page-about .plan-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .plan-list__item {
  padding: 18px 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-line);
  border-left: 3px solid var(--celadon);
  background: var(--about-glass);
  backdrop-filter: blur(6px);
}

.page-about .plan-list__title {
  margin: 0 0 6px;
  font-size: 17px;
}

.page-about .plan-list__text {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--graphite);
}

/* ---------- 结尾区块 ---------- */
.page-about .about-cta {
  margin-top: clamp(30px, 5vw, 56px);
  background: linear-gradient(150deg, var(--ink-2), var(--ink) 72%);
  border-top: 3px solid transparent;
  border-image: linear-gradient(90deg, var(--gold), var(--electric)) 1;
}

.page-about .about-cta__inner {
  padding: clamp(30px, 5vw, 54px) 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}

.page-about .about-cta h2 {
  margin: 0 0 10px;
  color: var(--warm);
  font-size: clamp(24px, 3.4vw, 36px);
}

.page-about .about-cta p {
  margin: 0;
  font-family: var(--font-body);
  font-size: 16px;
  line-height: 1.8;
  color: rgba(247, 243, 234, .78);
  max-width: 52ch;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-cta .btn {
  text-decoration: none;
}

.page-about .about-cta .btn--ghost {
  color: var(--warm);
  border-color: rgba(247, 243, 234, .38);
}

.page-about .about-cta .btn--ghost:hover {
  border-color: var(--electric);
  color: var(--electric);
}

.page-about .about-cta .btn:focus-visible {
  outline: 2px solid var(--electric);
  outline-offset: 3px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 12px;
  }

  .page-about .lines {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .plan-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

  .page-about .team-panel {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about .chapter__inner {
    grid-template-columns: minmax(140px, 190px) minmax(0, 1fr);
    gap: clamp(30px, 5vw, 68px);
  }

  .page-about .chapter__index {
    position: sticky;
    top: 26px;
    align-self: start;
  }

  .page-about .lines {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .eco {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl__item,
  .page-about .line-card,
  .page-about .tl__dot,
  .page-about .tl__hint {
    transition: none;
  }

  .page-about .tl__item:hover,
  .page-about .line-card:hover {
    transform: none;
  }
}