.page-about {
  --about-rail-w: 250px;
  --about-rule: rgba(46, 64, 58, 0.75);
  --about-text: rgba(232, 255, 245, 0.82);
  background: var(--ink-900);
  color: var(--paper);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(0.9rem, 2.6vw, 1.6rem) 0 clamp(2.4rem, 5vw, 4.2rem);
  background:
    radial-gradient(115% 85% at 88% 0%, rgba(0, 230, 118, 0.16) 0%, transparent 58%),
    linear-gradient(180deg, var(--ink-850) 0%, var(--ink-900) 100%);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: -10%;
  width: min(520px, 58vw);
  height: 100%;
  background: linear-gradient(160deg, rgba(0, 240, 255, 0.1), transparent 62%);
  clip-path: polygon(42% 0, 100% 0, 100% 100%, 0 74%);
  pointer-events: none;
}

.page-about .about-hero > .shell {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(1.5rem, 4vw, 2.6rem);
  margin-top: clamp(1.2rem, 3vw, 2rem);
}

.page-about .about-hero__lead {
  max-width: 38ch;
}

.page-about .about-hero__lead h1 {
  margin: 0.6rem 0 0;
  font-size: clamp(2rem, 5.4vw, 3.75rem);
  font-weight: 900;
  line-height: 1.08;
  letter-spacing: -0.022em;
}

.page-about .about-hero__lede {
  margin: 1rem 0 0;
  max-width: 34rem;
  font-size: 1rem;
  line-height: 1.8;
  color: var(--about-text);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.75rem;
  margin-top: 1.6rem;
}

.page-about .about-hero__visual {
  margin: 0;
  position: relative;
}

.page-about .about-hero__visual img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 5 / 3;
  object-fit: cover;
  border-radius: var(--r-md);
}

.page-about .about-hero__visual::before {
  content: "";
  position: absolute;
  left: -0.55rem;
  top: -0.55rem;
  width: 4.2rem;
  height: 4.2rem;
  border-top: 2px solid var(--brand);
  border-left: 2px solid var(--brand);
  border-radius: var(--r-sm) 0 0 0;
  pointer-events: none;
}

.page-about .about-hero__caption {
  margin-top: 0.7rem;
  font-size: 0.76rem;
  letter-spacing: 0.02em;
  color: var(--mist);
}

.page-about .about-kpis {
  list-style: none;
  margin: clamp(1.8rem, 4vw, 2.8rem) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-rule);
  border-top: 1px solid var(--about-rule);
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-kpis .kpi {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 1rem 1rem 1.1rem;
  background: var(--ink-900);
}

.page-about .about-kpis .kpi__value {
  font-size: clamp(1.7rem, 4vw, 2.3rem);
  font-weight: 800;
  line-height: 1;
  color: var(--brand);
}

.page-about .about-kpis .kpi__label {
  font-size: 0.76rem;
  letter-spacing: 0.05em;
  color: var(--mist);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-body {
  display: grid;
  gap: clamp(2rem, 5vw, 3.5rem);
  padding-bottom: clamp(3rem, 8vw, 6rem);
}

.page-about .about-rail__title {
  margin: 0 0 0.9rem;
  font-size: 0.68rem;
  letter-spacing: 0.18em;
  color: var(--brand);
}

.page-about .about-rail__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem 1.1rem;
  font-size: 0.9rem;
}

.page-about .about-rail__list a {
  color: var(--paper);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  padding-bottom: 2px;
  transition: color var(--t-fast), border-color var(--t-fast);
}

.page-about .about-rail__list a:hover,
.page-about .about-rail__list a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}

.page-about .about-rail__note {
  margin-top: 1.2rem;
  padding-top: 1rem;
  border-top: 1px dashed var(--about-rule);
  font-size: 0.82rem;
  line-height: 1.7;
  color: var(--mist);
}

.page-about .about-rail__note .mono {
  display: block;
  margin-bottom: 0.35rem;
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
}

.page-about .about-rail__note p {
  margin: 0;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(1.6rem, 4vw, 2.6rem) 0;
  scroll-margin-top: 7rem;
}

.page-about .about-section + .about-section {
  border-top: 1px solid var(--about-rule);
}

.page-about .about-section__head {
  display: grid;
  gap: 0.55rem;
  margin-bottom: clamp(1.1rem, 3vw, 1.7rem);
}

.page-about .about-num {
  justify-self: start;
  padding: 0.15rem 0.62rem;
  font-size: 0.7rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  border: 1px solid rgba(0, 240, 255, 0.32);
  border-radius: 999px;
}

.page-about .about-section__title {
  margin: 0;
  max-width: 28ch;
  font-size: clamp(1.35rem, 3.4vw, 2rem);
  font-weight: 800;
  line-height: 1.24;
  letter-spacing: -0.012em;
}

.page-about .about-section__lede {
  margin: 0;
  max-width: 56ch;
  font-size: 0.95rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .about-section__body p {
  margin: 0 0 1rem;
  font-size: 0.96rem;
  line-height: 1.88;
  color: var(--about-text);
}

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

.page-about .about-section__note {
  margin: 1.2rem 0 0;
  padding-left: 0.9rem;
  border-left: 2px solid var(--ink-600);
  font-size: 0.88rem;
  line-height: 1.82;
  color: var(--mist);
}

.page-about .about-quote {
  margin: 1.5rem 0 0;
  padding: 1rem 1.1rem 1rem 1.2rem;
  border-left: 3px solid var(--brand);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
  background: linear-gradient(90deg, rgba(0, 230, 118, 0.1), transparent 88%);
  color: var(--paper);
  font-size: 0.98rem;
  line-height: 1.82;
}

.page-about .about-quote p {
  margin: 0;
}

/* ---------- 版本筛选与时间轴 ---------- */
.page-about .filter-bar {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  margin-bottom: 1.6rem;
}

.page-about .filter-btn {
  padding: 0.4rem 0.85rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  color: var(--mist);
  background: var(--ink-800);
  border: 1px solid var(--about-rule);
  border-radius: 999px;
  cursor: pointer;
  transition: color var(--t-fast), background var(--t-fast), border-color var(--t-fast);
}

.page-about .filter-btn:hover {
  color: var(--paper);
  border-color: var(--cyan);
}

.page-about .filter-btn[aria-pressed="true"] {
  color: var(--ink-900);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 1.35rem;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 0.55rem;
  bottom: 1.2rem;
  width: 2px;
  background: linear-gradient(180deg, var(--brand) 0%, var(--cyan) 55%, rgba(0, 240, 255, 0.06) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(1.4rem, 3.5vw, 2rem);
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -1.35rem;
  top: 0.42rem;
  width: 8px;
  height: 8px;
  border: 2px solid var(--cyan);
  border-radius: 50%;
  background: var(--ink-900);
  box-shadow: 0 0 0 3px rgba(0, 240, 255, 0.12);
}

.page-about .timeline__meta {
  margin: 0 0 0.35rem;
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--orange);
}

.page-about .timeline__title {
  margin: 0 0 0.5rem;
  font-size: clamp(1.06rem, 2.2vw, 1.28rem);
  font-weight: 800;
  line-height: 1.38;
}

.page-about .timeline__text {
  margin: 0;
  max-width: 60ch;
  font-size: 0.94rem;
  line-height: 1.86;
  color: var(--about-text);
}

/* ---------- 媒体容器 ---------- */
.page-about .media {
  margin: 0;
  position: relative;
  overflow: hidden;
  border-radius: var(--r-md);
  box-shadow: 0 18px 44px rgba(0, 0, 0, 0.34);
}

.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
}

/* ---------- 数据分层 ---------- */
.page-about .about-split {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.2rem);
}

.page-about .layers {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-about .layer {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  column-gap: 0.9rem;
  padding: 0.85rem 1rem 0.95rem;
  background: var(--ink-800);
  border-left: 3px solid var(--brand);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-about .layer--live {
  border-left-color: var(--cyan);
}

.page-about .layer--post {
  border-left-color: var(--orange);
}

.page-about .layer__index {
  grid-column: 1;
  grid-row: 1 / span 2;
  padding-top: 0.22rem;
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .layer__title {
  grid-column: 2;
  grid-row: 1;
  margin: 0;
  font-size: 1rem;
  font-weight: 800;
}

.page-about .layer__text {
  grid-column: 2;
  grid-row: 2;
  margin: 0.28rem 0 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--about-text);
}

/* ---------- 团队 ---------- */
.page-about .about-team {
  display: grid;
  gap: clamp(1.4rem, 3.5vw, 2.2rem);
}

.page-about .team-cards {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.8rem;
  margin-bottom: 1.3rem;
}

.page-about .team-card {
  padding: 0.9rem 1rem 1rem;
  border: 1px solid rgba(0, 230, 118, 0.22);
  border-radius: var(--r-md);
  background: linear-gradient(150deg, rgba(0, 230, 118, 0.13), rgba(0, 240, 255, 0.05));
}

.page-about .team-card__num {
  display: block;
  font-size: clamp(1.6rem, 3.6vw, 2.1rem);
  font-weight: 800;
  line-height: 1;
  color: var(--paper);
}

.page-about .team-card__label {
  display: block;
  margin-top: 0.42rem;
  font-size: 0.75rem;
  line-height: 1.55;
  color: var(--mist);
}

.page-about .about-team__body p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.86;
  color: var(--about-text);
}

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

/* ---------- 服务区域 ---------- */
.page-about .about-service {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-service__text p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.86;
  color: var(--about-text);
}

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

.page-about .contact-cards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
  align-content: start;
}

.page-about .contact-cards li {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.85rem 1rem 0.95rem;
  background: var(--ink-800);
  border-left: 3px solid var(--cyan);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-about .contact-card__label {
  font-size: 0.66rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .contact-card__value {
  font-family: var(--font-mono);
  font-size: 0.9rem;
  color: var(--paper);
  word-break: break-all;
}

.page-about .contact-cards .copy-btn {
  align-self: flex-start;
  margin-top: 0.35rem;
}

/* ---------- 合作与荣誉 ---------- */
.page-about .about-partners {
  display: grid;
  gap: 1.4rem;
}

.page-about .about-partners__text p {
  margin: 0 0 1rem;
  font-size: 0.95rem;
  line-height: 1.86;
  color: var(--about-text);
}

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

.page-about .awards {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.8rem;
  align-content: start;
}

.page-about .award {
  padding: 0.95rem 1rem 1rem;
  border: 1px solid rgba(255, 159, 28, 0.3);
  border-radius: var(--r-md);
  background: linear-gradient(135deg, rgba(255, 159, 28, 0.16), rgba(255, 159, 28, 0.03));
}

.page-about .award__name {
  display: block;
  font-size: 0.98rem;
  font-weight: 800;
  line-height: 1.4;
}

.page-about .award__note {
  display: block;
  margin-top: 0.35rem;
  font-size: 0.75rem;
  line-height: 1.6;
  color: var(--mist);
}

/* ---------- 下一阶段 ---------- */
.page-about .about-next {
  padding: clamp(1.15rem, 3vw, 1.8rem);
  border: 1px solid rgba(0, 230, 118, 0.2);
  border-radius: var(--r-lg);
  background: linear-gradient(120deg, rgba(0, 230, 118, 0.14), rgba(0, 240, 255, 0.07) 55%, transparent 100%);
}

.page-about .about-next p {
  margin: 0 0 0.9rem;
  font-size: 0.96rem;
  line-height: 1.86;
  color: var(--paper);
}

.page-about .about-next p:last-of-type {
  margin-bottom: 0;
}

.page-about .about-next p a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 240, 255, 0.42);
  transition: border-color var(--t-fast), color var(--t-fast);
}

.page-about .about-next p a:hover,
.page-about .about-next p a:focus-visible {
  color: var(--volt);
  border-bottom-color: var(--volt);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.2rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-kpis {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    align-items: end;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 22rem) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-team {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
  }

  .page-about .about-service {
    grid-template-columns: minmax(0, 1.35fr) minmax(0, 1fr);
    align-items: start;
  }

  .page-about .about-partners {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
    align-items: start;
  }
}

@media (min-width: 1024px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    column-gap: clamp(2.4rem, 4vw, 4.2rem);
    align-items: start;
  }

  .page-about .about-rail {
    position: sticky;
    top: 7.5rem;
    align-self: start;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0.55rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .filter-btn,
  .page-about .about-rail__list a,
  .page-about .about-next p a {
    transition: none;
  }
}
</page-about>