.page-about {
  --about-rail: 212px;
  --about-pad: clamp(1.5rem, 3vw, 2.6rem);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding-block: clamp(1.4rem, 3vw, 2.2rem) clamp(2.6rem, 6vw, 4.6rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background:
    radial-gradient(58% 62% at 6% 0%, rgba(42, 27, 74, 0.92), transparent 72%),
    radial-gradient(48% 56% at 102% 24%, rgba(11, 58, 58, 0.78), transparent 70%);
  pointer-events: none;
}

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

.page-about .about-hero__inner {
  display: grid;
  gap: clamp(1.6rem, 3.4vw, 3rem);
  align-items: center;
  margin-top: clamp(1.2rem, 3vw, 2rem);
}

.page-about .about-hero__title {
  margin: 0.5rem 0 1rem;
  font-size: clamp(2.15rem, 5.2vw, 4.2rem);
  line-height: 1.03;
  font-weight: 900;
  letter-spacing: -0.02em;
  color: var(--m-mist);
  transform: skewX(-2deg);
  transform-origin: left bottom;
}

.page-about .about-hero__lede {
  max-width: 58ch;
  margin: 0 0 1.5rem;
  font-size: clamp(1rem, 1.5vw, 1.14rem);
  line-height: 1.8;
  color: rgba(242, 245, 248, 0.86);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

.page-about .about-hero__frame {
  position: relative;
  margin: 0;
  padding: clamp(0.5rem, 1.2vw, 0.85rem);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(158deg, rgba(13, 27, 46, 0.94), rgba(7, 16, 31, 0.94));
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero__frame::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -9px;
  height: 8px;
  background-image: repeating-linear-gradient(90deg, var(--m-cyan) 0 1px, transparent 1px 13px);
  opacity: 0.42;
}

.page-about .about-hero__frame .media-frame {
  border: 0;
  border-radius: calc(var(--radius-lg) - 8px);
  overflow: hidden;
}

.page-about .about-hero__frame img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-hero__frame figcaption {
  margin-top: 0.55rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--m-silver);
}

/* ---------- 索引 + 长文骨架 ---------- */
.page-about .about-body {
  padding-block: clamp(2.2rem, 5vw, 4.2rem);
  display: grid;
  gap: clamp(1.4rem, 3vw, 2.8rem);
  align-items: start;
}

.page-about .about-rail__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--m-cyan);
}

.page-about .about-rail__list {
  display: flex;
  gap: 0.45rem;
  margin: 0;
  padding: 0 0 0.6rem;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: none;
}

.page-about .about-rail__list::-webkit-scrollbar {
  display: none;
}

.page-about .about-rail__item {
  flex: 0 0 auto;
}

.page-about .about-rail__link {
  display: inline-flex;
  align-items: center;
  gap: 0.45rem;
  padding: 0.45rem 0.85rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-pill);
  background: var(--surface);
  color: var(--m-silver);
  font-size: 0.84rem;
  font-weight: 600;
  line-height: 1.2;
  white-space: nowrap;
  text-decoration: none;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease),
    background var(--dur) var(--ease);
}

.page-about .about-rail__link::before {
  content: "";
  flex: 0 0 auto;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--m-cyan);
  box-shadow: 0 0 0 3px rgba(57, 217, 208, 0.15);
}

.page-about .about-rail__link:hover,
.page-about .about-rail__link:focus-visible {
  color: var(--m-mist);
  border-color: var(--line-cyan);
  background: rgba(57, 217, 208, 0.09);
}

.page-about .about-flow {
  display: grid;
  gap: clamp(1.3rem, 3vw, 2.2rem);
  min-width: 0;
}

/* ---------- 画板式面板 ---------- */
.page-about .about-block {
  padding: var(--about-pad);
  border-radius: var(--radius-lg);
  scroll-margin-top: 96px;
}

.page-about .about-block__title {
  margin: 0.35rem 0 1rem;
  font-size: clamp(1.5rem, 2.7vw, 2.3rem);
  line-height: 1.16;
  font-weight: 800;
  letter-spacing: -0.01em;
  color: var(--m-mist);
}

.page-about .about-text p,
.page-about .about-lede {
  max-width: 68ch;
  margin: 0 0 1rem;
  font-size: clamp(0.98rem, 1.35vw, 1.06rem);
  line-height: 1.8;
  color: rgba(242, 245, 248, 0.86);
}

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

.page-about .about-lede {
  color: rgba(242, 245, 248, 0.9);
}

.page-about .about-note {
  max-width: 70ch;
  margin: clamp(1.2rem, 2.6vw, 1.7rem) 0 0;
  padding-top: 1rem;
  border-top: 1px solid var(--line);
  font-size: 0.94rem;
  line-height: 1.78;
  color: rgba(242, 245, 248, 0.76);
}

.page-about .about-quote {
  position: relative;
  margin: clamp(1.4rem, 3vw, 2rem) 0 0;
  padding: clamp(1rem, 2.4vw, 1.5rem) clamp(1.1rem, 2.4vw, 1.8rem);
  border-left: 3px solid var(--m-orange);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  background: linear-gradient(90deg, rgba(255, 107, 44, 0.16), rgba(255, 107, 44, 0.02));
  font-size: clamp(1.1rem, 2.1vw, 1.44rem);
  font-weight: 700;
  line-height: 1.55;
  letter-spacing: -0.01em;
  color: var(--m-mist);
}

/* ---------- 图片区 ---------- */
.page-about .about-figure {
  margin: 0;
}

.page-about .about-figure .media-frame {
  border-radius: var(--radius-md);
  overflow: hidden;
  border: 1px solid var(--line);
}

.page-about .about-figure img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.page-about .about-figure figcaption {
  margin-top: 0.6rem;
  font-size: 0.82rem;
  line-height: 1.6;
  color: var(--m-silver);
}

/* ---------- 实验室区域 ---------- */
.page-about .about-lab {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
  align-items: start;
}

.page-about .about-table-cap {
  padding: 0 0 0.7rem;
  font-family: var(--font-data);
  font-size: 0.76rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--m-cyan);
  text-align: left;
}

.page-about .data-scroll {
  margin-top: clamp(1.2rem, 2.6vw, 1.8rem);
}

/* ---------- 版本卡片 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 0.85rem;
  margin-top: clamp(1.2rem, 2.8vw, 1.8rem);
}

.page-about .version-card {
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: linear-gradient(152deg, rgba(42, 27, 74, 0.6), rgba(13, 27, 46, 0.78));
  overflow: hidden;
  transition: border-color var(--dur) var(--ease), transform var(--dur) var(--ease);
}

.page-about .version-card:hover {
  transform: translateY(-2px);
}

.page-about .version-card[open] {
  border-color: var(--line-cyan);
}

.page-about .version-card summary {
  display: flex;
  align-items: center;
  gap: 0.75rem;
  padding: clamp(0.85rem, 2vw, 1.15rem) clamp(1rem, 2.4vw, 1.5rem);
  cursor: pointer;
  list-style: none;
  font-size: clamp(1rem, 1.55vw, 1.12rem);
  font-weight: 800;
  color: var(--m-mist);
}

.page-about .version-card summary::-webkit-details-marker {
  display: none;
}

.page-about .version-card summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-data);
  font-size: 1.05rem;
  color: var(--m-cyan);
}

.page-about .version-card[open] summary::after {
  content: "–";
}

.page-about .version-card__tag {
  flex: 0 0 auto;
  padding: 0.14rem 0.55rem;
  border-radius: var(--radius-pill);
  background: var(--m-cyan);
  color: var(--m-void);
  font-family: var(--font-data);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .version-card__body {
  padding: 0 clamp(1rem, 2.4vw, 1.5rem) clamp(1rem, 2.4vw, 1.4rem);
}

.page-about .version-card__body p {
  max-width: 66ch;
  margin: 0;
  font-size: 0.96rem;
  line-height: 1.76;
  color: rgba(242, 245, 248, 0.85);
}

/* ---------- 团队卡片 ---------- */
.page-about .filter-bar {
  margin-top: clamp(1.1rem, 2.6vw, 1.6rem);
  flex-wrap: wrap;
}

.page-about .about-teams {
  display: grid;
  gap: 0.85rem;
  margin-top: clamp(1.1rem, 2.6vw, 1.5rem);
}

.page-about .about-team {
  padding: clamp(1rem, 2.2vw, 1.35rem);
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: var(--surface);
}

.page-about .about-team[hidden] {
  display: none;
}

.page-about .about-team__role {
  margin: 0;
  font-family: var(--font-data);
  font-size: 0.74rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--m-cyan);
}

.page-about .about-team__name {
  margin: 0.4rem 0 0.55rem;
  font-size: clamp(1rem, 1.5vw, 1.1rem);
  font-weight: 800;
  line-height: 1.4;
  color: var(--m-mist);
}

.page-about .about-team p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.74;
  color: rgba(242, 245, 248, 0.8);
}

/* ---------- 联络信息 ---------- */
.page-about .about-contact-grid {
  display: grid;
  gap: 0.8rem;
  margin-top: clamp(1.2rem, 2.8vw, 1.7rem);
}

.page-about .about-contact-item {
  padding: 0.95rem 1.1rem;
  border: 1px solid var(--line);
  border-radius: var(--radius-md);
  background: rgba(7, 16, 31, 0.6);
}

.page-about .about-contact-key {
  display: block;
  margin-bottom: 0.32rem;
  font-family: var(--font-data);
  font-size: 0.72rem;
  letter-spacing: 0.12em;
  text-transform: uppercase;
  color: var(--m-silver);
}

.page-about .about-contact-val {
  display: block;
  font-size: 0.98rem;
  line-height: 1.6;
  color: var(--m-mist);
  word-break: break-word;
}

.page-about .about-cta-row {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: clamp(1.2rem, 2.8vw, 1.7rem);
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-lab {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 1fr);
  }

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

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

@media (min-width: 940px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.02fr);
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
  }

  .page-about .about-rail {
    position: sticky;
    top: 92px;
  }

  .page-about .about-rail__list {
    flex-direction: column;
    gap: 0.28rem;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .about-rail__link {
    width: 100%;
    padding: 0.55rem 0.7rem;
    border-color: transparent;
    border-radius: var(--radius-sm);
    background: transparent;
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    background: rgba(57, 217, 208, 0.1);
  }

  .page-about .about-figure--wide {
    max-width: 78%;
  }
}

@media (max-width: 480px) {
  .page-about .about-hero__title {
    transform: none;
  }

  .page-about .about-hero__actions .btn {
    flex: 1 1 auto;
  }

  .page-about .about-quote {
    border-left-width: 2px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .version-card,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .version-card:hover {
    transform: none;
  }
}