.page-about {
  --about-shadow-soft: 0 24px 48px -32px rgba(53, 242, 208, 0.38);
  display: block;
}

.page-about .breadcrumb {
  padding-top: clamp(0.5rem, 2vw, 1rem);
}

.page-about .breadcrumb-sep {
  color: var(--line-cyan);
  list-style: none;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(0.75rem, 2.5vw, 1.5rem) 0 clamp(2rem, 5vw, 3.5rem);
  overflow: hidden;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  top: -12%;
  right: -18%;
  width: min(52vw, 640px);
  height: min(52vw, 640px);
  background: radial-gradient(circle, rgba(53, 242, 208, 0.14) 0%, rgba(53, 242, 208, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__grid,
.page-about .about-hero > .container {
  position: relative;
  z-index: 1;
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.5rem, 4vw, 2.5rem);
  align-items: start;
}

.page-about .about-hero__lede {
  max-width: 34rem;
  margin-top: clamp(0.8rem, 2vw, 1.1rem);
  color: var(--muted);
}

.page-about .hl {
  color: var(--cyan);
  display: inline-block;
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.65rem;
  margin-top: clamp(1.1rem, 3vw, 1.6rem);
}

.page-about .about-hero__visual {
  position: relative;
  padding: clamp(0.7rem, 2vw, 1.1rem);
  border-radius: var(--r-lg);
  background: var(--teal-grad);
  border: 1px solid var(--line-soft);
  box-shadow: var(--float-shadow);
  overflow: hidden;
}

.page-about .about-hero__media {
  margin: 0;
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--green);
}

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

.page-about .about-hero__note {
  display: none;
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: var(--line-soft);
  overflow: hidden;
}

.page-about .about-metrics .stat {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  padding: 0.95rem 1rem;
  background: rgba(23, 26, 28, 0.88);
}

.page-about .about-metrics .stat-value {
  font-family: var(--font-num);
  font-size: clamp(1.5rem, 4vw, 2rem);
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .stat-unit {
  font-size: 0.62em;
  margin-left: 0.15em;
  color: var(--muted);
}

.page-about .about-metrics .stat-label {
  font-size: 0.75rem;
  letter-spacing: 0.08em;
  color: var(--muted);
}

/* ---------- 通用标题块 ---------- */
.page-about .about-head {
  max-width: 44rem;
}

.page-about .about-head .title-lg {
  margin: 0.45rem 0 0.7rem;
}

.page-about .about-head .lede {
  color: var(--muted);
}

/* ---------- 时间轴 ---------- */
.page-about .about-journey {
  border-top: 1px solid var(--line-soft);
}

.page-about .journey {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.25rem, 3vw, 2rem);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
}

.page-about .journey-rail__list {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.15rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .journey-rail__list::before {
  content: "";
  position: absolute;
  left: 8px;
  top: 1.4rem;
  bottom: 1.4rem;
  width: 1px;
  background: linear-gradient(180deg, rgba(53, 242, 208, 0.6), rgba(168, 199, 189, 0.12));
}

.page-about .journey-node {
  position: relative;
  display: block;
  width: 100%;
  padding: 0.6rem 0.6rem 0.6rem 2.1rem;
  border: 0;
  border-radius: var(--r-sm);
  background: transparent;
  color: var(--muted);
  text-align: left;
  font-family: var(--font-body);
  font-size: 0.95rem;
  line-height: 1.4;
  cursor: pointer;
  transition: color 0.2s ease, background-color 0.2s ease;
}

.page-about .journey-node::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 1.05rem;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--line-cyan);
  box-shadow: 0 0 0 4px var(--ink);
  transition: background-color 0.2s ease, border-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .journey-node:hover {
  color: var(--bone);
}

.page-about .journey-node:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .journey-node[aria-selected="true"] {
  color: var(--bone);
  background: rgba(53, 242, 208, 0.07);
}

.page-about .journey-node[aria-selected="true"]::before {
  background: var(--amber);
  border-color: var(--amber);
  box-shadow: 0 0 0 4px rgba(255, 179, 71, 0.2);
}

.page-about .journey-node__year {
  display: block;
  font-family: var(--font-num);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 0.15rem;
}

.page-about .journey-node[aria-selected="true"] .journey-node__year {
  color: var(--amber);
}

.page-about .journey-node__label {
  display: block;
}

.page-about .journey-panel {
  position: relative;
  padding: clamp(1.25rem, 3.5vw, 2rem);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background: linear-gradient(155deg, rgba(23, 26, 28, 0.96), rgba(13, 36, 32, 0.92));
  box-shadow: var(--about-shadow-soft);
  overflow: hidden;
}

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

.page-about .journey-panel::after {
  content: "";
  position: absolute;
  top: -40%;
  right: -20%;
  width: 60%;
  height: 120%;
  background: radial-gradient(circle, rgba(53, 242, 208, 0.1), transparent 70%);
  pointer-events: none;
}

.page-about .journey-panel__year {
  font-family: var(--font-num);
  font-size: clamp(2rem, 6vw, 2.75rem);
  line-height: 1;
  color: rgba(53, 242, 208, 0.5);
  letter-spacing: 0.04em;
}

.page-about .journey-panel .title-md {
  margin: 0.4rem 0 0.6rem;
}

.page-about .journey-panel__text {
  color: var(--muted);
  max-width: 34rem;
}

.page-about .journey-panel__list {
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
  display: grid;
  gap: 0.45rem;
  max-width: 34rem;
}

.page-about .journey-panel__list li {
  position: relative;
  padding-left: 1.15rem;
  font-size: 0.92rem;
  color: var(--bone);
}

.page-about .journey-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .journey-panel__link {
  display: inline-block;
  margin-top: 1.1rem;
  color: var(--amber);
  font-size: 0.9rem;
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 179, 71, 0.4);
  padding-bottom: 0.15rem;
}

.page-about .journey-panel__link:hover,
.page-about .journey-panel__link:focus-visible {
  color: var(--bone);
  border-bottom-color: var(--bone);
}

/* ---------- 四块研究板 ---------- */
.page-about .about-study {
  background: linear-gradient(180deg, rgba(13, 36, 32, 0.62), rgba(7, 17, 15, 0) 70%);
}

.page-about .study-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(0.9rem, 2.5vw, 1.25rem);
  margin-top: clamp(1.5rem, 4vw, 2.5rem);
  padding-bottom: 0;
}

.page-about .study-card {
  display: flex;
  flex-direction: column;
  gap: 0.55rem;
  padding: clamp(1.1rem, 3vw, 1.7rem);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background: linear-gradient(160deg, rgba(13, 36, 32, 0.95), rgba(23, 26, 28, 0.95));
}

.page-about .study-card p {
  color: var(--muted);
  font-size: 0.94rem;
}

.page-about .study-card .title-md {
  margin: 0.2rem 0 0.1rem;
}

.page-about .study-card__meta {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem;
  margin-top: auto;
  padding-top: 0.55rem;
  border-top: 1px solid var(--line-soft);
  font-size: 0.82rem;
  color: var(--bone);
}

.page-about .study-card .pill {
  align-self: flex-start;
}

/* ---------- 团队 ---------- */
.page-about .team-band {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.2rem, 3vw, 2rem);
  align-items: center;
}

.page-about .team-band__media {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  background: var(--green);
}

.page-about .team-band__intro .title-lg {
  margin: 0.45rem 0 0.7rem;
}

.page-about .team-band__intro .lede {
  color: var(--muted);
}

.page-about .team-cols {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1rem, 2.5vw, 1.25rem);
  margin-top: clamp(1.4rem, 3.5vw, 2rem);
}

.page-about .team-col {
  padding: 0.25rem 0 0.25rem 1.1rem;
  border-left: 2px solid var(--line-cyan);
}

.page-about .team-col__num {
  font-family: var(--font-num);
  font-size: clamp(1.7rem, 5vw, 2.1rem);
  line-height: 1;
  color: var(--cyan);
}

.page-about .team-col__title {
  margin: 0.45rem 0 0.5rem;
  font-family: var(--font-display);
  font-size: 1.2rem;
  letter-spacing: 0.01em;
  color: var(--bone);
}

.page-about .team-col p {
  font-size: 0.9rem;
  color: var(--muted);
}

.page-about .team-col__tags {
  display: flex;
  flex-wrap: wrap;
  gap: 0.4rem;
  margin-top: 0.7rem;
}

.page-about .team-flow {
  margin-top: clamp(1.5rem, 3.5vw, 2.2rem);
  padding: clamp(1.1rem, 3vw, 1.6rem);
  border: 1px solid var(--line-soft);
  border-radius: var(--r-lg);
  background: rgba(23, 26, 28, 0.7);
}

.page-about .team-flow__list {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .team-flow__btn {
  padding: 0.45rem 1rem;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: transparent;
  color: var(--muted);
  font-family: var(--font-body);
  font-size: 0.85rem;
  cursor: pointer;
  transition: color 0.2s ease, border-color 0.2s ease, background-color 0.2s ease;
}

.page-about .team-flow__btn:hover {
  color: var(--bone);
}

.page-about .team-flow__btn:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: 2px;
}

.page-about .team-flow__btn[aria-selected="true"] {
  color: var(--ink);
  background: var(--cyan);
  border-color: var(--cyan);
}

.page-about .team-flow__panels {
  margin-top: 1rem;
}

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

.page-about .team-flow__panel p {
  color: var(--muted);
  font-size: 0.94rem;
  max-width: 46rem;
}

/* ---------- 合作网络 ---------- */
.page-about .about-network {
  border-top: 1px solid var(--line-soft);
}

.page-about .network-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 4vw, 2.5rem);
  align-items: center;
}

.page-about .network-visual__frame {
  margin: 0;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--line-soft);
  box-shadow: var(--about-shadow-soft);
  background: var(--green);
}

.page-about .network-visual__note {
  margin-top: 0.75rem;
  font-size: 0.82rem;
  color: var(--muted);
}

.page-about .network-nodes .title-lg {
  margin: 0.45rem 0 0.7rem;
}

.page-about .network-nodes__lede {
  color: var(--muted);
  max-width: 34rem;
}

.page-about .net-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  list-style: none;
  margin: 1.4rem 0 0;
  padding: 1.4rem 0 0;
}

.page-about .net-node {
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 0.2rem;
  padding: 0.85rem 0.95rem;
  border: 1px solid var(--line-soft);
  border-radius: var(--r-md);
  background: rgba(13, 36, 32, 0.62);
  transition: border-color 0.2s ease, transform 0.2s ease;
}

.page-about .net-node:hover,
.page-about .net-node:focus-visible {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
  outline: none;
}

.page-about .net-node:focus-visible {
  box-shadow: 0 0 0 2px rgba(53, 242, 208, 0.4);
}

.page-about .net-node--wide {
  grid-column: span 2;
}

.page-about .net-node__num {
  font-family: var(--font-num);
  font-size: 1.35rem;
  line-height: 1.1;
  color: var(--cyan);
}

.page-about .net-node__unit {
  font-size: 0.6em;
  color: var(--muted);
  margin-left: 0.1em;
}

.page-about .net-node__name {
  font-size: 0.84rem;
  color: var(--bone);
}

.page-about .net-node__tag {
  position: absolute;
  left: 0.7rem;
  bottom: calc(100% + 0.4rem);
  padding: 0.18rem 0.55rem;
  border-radius: var(--pill);
  background: var(--amber);
  color: var(--ink);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  white-space: nowrap;
  opacity: 0;
  transform: translateY(4px);
  pointer-events: none;
  transition: opacity 0.2s ease, transform 0.2s ease;
}

.page-about .net-node:hover .net-node__tag,
.page-about .net-node:focus-visible .net-node__tag {
  opacity: 1;
  transform: translateY(0);
}

/* ---------- 视觉说明 ---------- */
.page-about .about-look__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(1.4rem, 4vw, 2.5rem);
}

.page-about .about-look__copy .title-lg {
  margin: 0.45rem 0 0.8rem;
}

.page-about .about-look__copy p {
  color: var(--muted);
  max-width: 38rem;
}

.page-about .about-look__copy p + p {
  margin-top: 0.85rem;
}

.page-about .swatch-list {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 0.7rem;
  list-style: none;
  margin: 1rem 0 0;
  padding: 0;
}

.page-about .swatch {
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
  font-size: 0.76rem;
  color: var(--muted);
}

.page-about .swatch__chip {
  display: block;
  height: 44px;
  border-radius: var(--r-sm);
  border: 1px solid rgba(242, 247, 244, 0.1);
}

.page-about .swatch--ink .swatch__chip { background: #07110F; }
.page-about .swatch--green .swatch__chip { background: #0D2420; }
.page-about .swatch--panel .swatch__chip { background: #171A1C; }
.page-about .swatch--cyan .swatch__chip { background: #35F2D0; }
.page-about .swatch--amber .swatch__chip { background: #FFB347; }
.page-about .swatch--red .swatch__chip { background: #D64545; }
.page-about .swatch--muted .swatch__chip { background: #A8C7BD; }
.page-about .swatch--bone .swatch__chip { background: #F2F7F4; }

.page-about .swatch__name {
  color: var(--bone);
  font-size: 0.8rem;
}

.page-about .swatch__use {
  font-size: 0.72rem;
  letter-spacing: 0.08em;
}

/* ---------- 结尾 ---------- */
.page-about .about-cta__inner {
  padding: clamp(1.4rem, 4vw, 2.6rem);
  border: 1px solid var(--line-cyan);
  border-radius: var(--r-lg);
  background: var(--teal-grad);
  box-shadow: var(--about-shadow-soft);
}

.page-about .about-cta__text {
  margin-top: 0.6rem;
  color: var(--muted);
  max-width: 36rem;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
  margin-top: 1.2rem;
}

.page-about .about-cta__contact {
  margin-top: 1.1rem;
  font-size: 0.84rem;
  color: var(--muted);
}

.page-about .about-cta__contact a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(53, 242, 208, 0.45);
}

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

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

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

  .page-about .swatch-list {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 760px) {
  .page-about .team-cols {
    grid-template-columns: 1.25fr 1fr 1fr;
  }
}

@media (min-width: 880px) {
  .page-about .study-grid {
    grid-template-columns: 1.35fr 1fr;
    align-items: start;
  }

  .page-about .study-card:nth-child(even) {
    margin-top: 1.9rem;
  }

  .page-about .study-grid {
    padding-bottom: 1.9rem;
  }
}

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

  .page-about .about-hero__note {
    display: block;
    position: absolute;
    top: 1.4rem;
    right: 0.55rem;
    writing-mode: vertical-rl;
    font-size: 0.66rem;
    letter-spacing: 0.34em;
    text-transform: uppercase;
    color: rgba(53, 242, 208, 0.78);
    pointer-events: none;
  }

  .page-about .about-hero__visual {
    padding-right: 2rem;
  }

  .page-about .team-band {
    grid-template-columns: minmax(0, 5fr) minmax(0, 6fr);
  }

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

  .page-about .about-look__grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 6fr);
    align-items: start;
  }
}

@media (min-width: 960px) {
  .page-about .journey {
    grid-template-columns: minmax(210px, 4fr) minmax(0, 7fr);
    gap: clamp(1.5rem, 4vw, 3rem);
    align-items: start;
  }

  .page-about .journey-rail {
    position: sticky;
    top: 6rem;
  }

  .page-about .journey-panel {
    min-height: 320px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .journey-node,
  .page-about .net-node,
  .page-about .net-node__tag,
  .page-about .team-flow__btn {
    transition: none;
  }

  .page-about .net-node:hover,
  .page-about .net-node:focus-visible {
    transform: none;
  }
}