.page-about {
  --ab-gold-line: rgba(201, 164, 92, 0.34);
  --ab-gold-soft: rgba(201, 164, 92, 0.14);
  --ab-cyan-soft: rgba(53, 214, 232, 0.12);
  --ab-orange-soft: rgba(255, 106, 42, 0.14);
  background: var(--ink);
  color: var(--bone);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-display);
  font-weight: 800;
  letter-spacing: -0.015em;
  line-height: 1.06;
  margin: 0;
}

.page-about p {
  margin: 0 0 0.9rem;
  line-height: 1.85;
  font-size: 0.96rem;
  color: var(--bone);
}

.page-about a {
  color: var(--cyan);
}

.page-about .btn {
  margin-top: 0.4rem;
}

/* ---------- 封面 ---------- */
.page-about .about-cover {
  position: relative;
  padding: calc(var(--header-h) + 1.6rem) 0 0;
  background:
    radial-gradient(120% 90% at 84% -12%, rgba(53, 214, 232, 0.18), transparent 62%),
    radial-gradient(90% 80% at 4% 108%, var(--ab-orange-soft), transparent 64%),
    var(--ink);
  border-bottom: 1px solid var(--line);
  overflow: hidden;
}

.page-about .about-cover::before {
  content: "";
  position: absolute;
  inset: -20% -10% auto auto;
  width: 68%;
  height: 160%;
  background-image: repeating-linear-gradient(
    135deg,
    rgba(167, 176, 184, 0.09) 0 1px,
    transparent 1px 22px
  );
  transform: skewX(-8deg);
  pointer-events: none;
  opacity: 0.7;
}

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

.page-about .breadcrumb {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--mist);
  margin-bottom: 1.6rem;
}

.page-about .breadcrumb a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

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

.page-about .breadcrumb span[aria-current="page"] {
  color: var(--orange);
}

.page-about .about-cover__grid {
  display: grid;
  gap: 1.8rem;
  align-items: end;
}

.page-about .about-kicker {
  display: inline-flex;
  align-items: center;
  gap: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.16em;
  color: var(--cyan);
  margin-bottom: 1rem;
}

.page-about .about-kicker__dot {
  width: 9px;
  height: 9px;
  background: var(--orange);
  transform: rotate(45deg);
  box-shadow: 0 0 0 3px var(--ab-orange-soft);
}

.page-about .about-cover h1 {
  font-size: clamp(1.85rem, 7.4vw, 3.4rem);
  max-width: 15em;
  margin-bottom: 1.1rem;
}

.page-about .about-lead {
  max-width: 44rem;
  color: var(--mist);
  font-size: 1rem;
  line-height: 1.9;
}

.page-about .about-cover__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
  margin-top: 1.4rem;
}

.page-about .about-folder {
  position: relative;
  margin: 0;
  border: 2px solid var(--line);
  border-left: 6px solid var(--gold);
  background: var(--slate);
  box-shadow: var(--shadow-hard);
  padding: 0.75rem;
}

.page-about .about-folder img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  aspect-ratio: 14 / 9;
  filter: saturate(0.9) contrast(1.05);
}

.page-about .about-folder__label {
  display: block;
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-folder__badge {
  position: absolute;
  top: -0.85rem;
  right: 1rem;
  padding: 0.32rem 0.7rem;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.14em;
  color: var(--gold);
  background: var(--ink);
  border: 1px solid var(--ab-gold-line);
}

.page-about .about-strip {
  list-style: none;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 2.2rem 0 0;
  padding: 0;
  background: var(--line);
  border-top: 1px solid var(--line);
}

.page-about .about-strip__item {
  background: var(--ink);
  padding: 0.9rem 0.85rem;
  display: flex;
  flex-direction: column;
  gap: 0.3rem;
}

.page-about .about-strip__k {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--mist);
}

.page-about .about-strip__v {
  font-family: var(--font-mono);
  font-size: 1.32rem;
  font-weight: 700;
  color: var(--bone);
  letter-spacing: 0.02em;
}

.page-about .about-strip__v em {
  font-style: normal;
  font-size: 0.72rem;
  color: var(--cyan);
  margin-left: 0.16rem;
}

/* ---------- 区块骨架 ---------- */
.page-about .about-sec {
  padding: 3rem 0;
  border-bottom: 1px solid var(--line-soft);
}

.page-about .about-sec--timeline {
  background: var(--slate);
}

.page-about .about-sec--team {
  background:
    linear-gradient(180deg, var(--ink) 0%, var(--stratum) 100%);
}

.page-about .about-sec--cert {
  background: var(--ink);
}

.page-about .about-sec--eco {
  background:
    radial-gradient(80% 70% at 92% 10%, var(--ab-cyan-soft), transparent 60%),
    var(--slate);
}

.page-about .sec-head {
  margin-bottom: 1.8rem;
  border-left: 4px solid var(--orange);
  padding-left: 0.9rem;
}

.page-about .sec-head--tight {
  margin-bottom: 1.1rem;
}

.page-about .sec-num {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  letter-spacing: 0.18em;
  color: var(--cyan);
  margin-bottom: 0.5rem;
}

.page-about .sec-title {
  font-size: clamp(1.35rem, 4.6vw, 2.1rem);
  max-width: 22em;
}

.page-about .sec-desc {
  margin-top: 0.75rem;
  max-width: 46rem;
  color: var(--mist);
  font-size: 0.92rem;
}

/* ---------- 01 起点 ---------- */
.page-about .origin-grid {
  display: grid;
  gap: 1.4rem;
}

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

.page-about .origin-card {
  border: 2px solid var(--line);
  background: var(--stratum);
  padding: 1.2rem 1.1rem;
  box-shadow: var(--shadow-hard);
  position: relative;
}

.page-about .origin-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 26px;
  height: 26px;
  background: var(--orange);
  clip-path: polygon(100% 0, 100% 100%, 0 0);
}

.page-about .origin-card__title {
  font-size: 1.02rem;
  margin-bottom: 0.9rem;
  color: var(--bone);
}

.page-about .origin-card__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .origin-card__list li {
  font-size: 0.9rem;
  line-height: 1.75;
  color: var(--mist);
  padding-left: 0.1rem;
}

.page-about .origin-card__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--cyan);
  padding: 0.1rem 0.4rem;
  margin-right: 0.45rem;
  vertical-align: 1px;
}

/* ---------- 02 时间线 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 15px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--orange), var(--cyan) 55%, var(--moss));
  opacity: 0.55;
}

.page-about .tl-item {
  position: relative;
  padding-left: 46px;
  margin-bottom: 1rem;
}

.page-about .tl-mark {
  position: absolute;
  left: 0;
  top: 0.95rem;
  width: 32px;
  height: 32px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.74rem;
  font-weight: 700;
  color: var(--cyan);
  background: var(--ink);
  border: 2px solid var(--line-cyan);
  border-radius: 50%;
}

.page-about .tl-card {
  border: 2px solid var(--line);
  background: var(--ink);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.22s var(--ease), box-shadow 0.22s var(--ease), transform 0.22s var(--ease);
}

.page-about .tl-card[open] {
  border-color: var(--ab-gold-line);
  background: linear-gradient(160deg, var(--stratum), var(--ink) 70%);
}

.page-about .tl-card:hover {
  border-color: var(--line-cyan);
  transform: translateY(-2px);
}

.page-about .tl-card summary {
  cursor: pointer;
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 0.5rem 0.75rem;
  padding: 0.9rem 1rem;
  position: relative;
  padding-right: 3rem;
}

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

.page-about .tl-card summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-about .tl-card summary::after {
  content: "+";
  position: absolute;
  right: 1rem;
  top: 50%;
  transform: translateY(-50%);
  font-family: var(--font-mono);
  font-size: 1.1rem;
  color: var(--orange);
  line-height: 1;
}

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

.page-about .tl-ver {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.1em;
  color: var(--gold);
  border: 1px solid var(--ab-gold-line);
  padding: 0.12rem 0.42rem;
  white-space: nowrap;
}

.page-about .tl-name {
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--bone);
}

.page-about .tl-card p {
  margin: 0;
  padding: 0 1rem 1rem;
  font-size: 0.9rem;
  color: var(--mist);
}

/* ---------- 03 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 1.2rem;
}

.page-about .team-graph-panel {
  border: 2px solid var(--line);
  background: var(--ink);
  padding: 1rem;
  box-shadow: var(--shadow-hard);
}

.page-about .team-graph {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
}

.page-about .tg-line {
  stroke: rgba(53, 214, 232, 0.34);
  stroke-width: 1.6;
  stroke-dasharray: 5 5;
}

.page-about .tg-node {
  fill: var(--stratum);
  stroke: var(--line);
  stroke-width: 1.6;
  transition: stroke 0.2s var(--ease), fill 0.2s var(--ease);
}

.page-about .tg-node--hub {
  fill: rgba(255, 106, 42, 0.16);
  stroke: var(--orange);
  stroke-width: 2;
}

.page-about .tg-label {
  fill: var(--bone);
  font-family: var(--font-mono);
  font-size: 13px;
  text-anchor: middle;
}

.page-about .tg-label--hub {
  fill: var(--orange);
  font-weight: 700;
  letter-spacing: 0.1em;
}

.page-about .team-graph__note {
  margin: 0.8rem 0 0;
  font-family: var(--font-mono);
  font-size: 0.72rem;
  line-height: 1.7;
  color: var(--mist);
  border-top: 1px dashed var(--line-soft);
  padding-top: 0.7rem;
}

.page-about .team-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.7rem;
}

.page-about .team-card {
  border: 1px solid var(--line);
  border-left: 4px solid var(--stratum);
  background: rgba(26, 31, 36, 0.72);
  padding: 0.85rem 0.95rem;
  transition: border-color 0.2s var(--ease), background 0.2s var(--ease), transform 0.2s var(--ease);
}

.page-about .team-card:hover,
.page-about .team-card:focus-visible {
  border-left-color: var(--cyan);
  background: var(--slate);
  transform: translateX(3px);
  outline: none;
}

.page-about .team-card:focus-visible {
  box-shadow: 0 0 0 2px var(--cyan) inset;
}

.page-about .team-card__no {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.14em;
  color: var(--moss);
}

.page-about .team-card__name {
  font-size: 1rem;
  margin: 0.2rem 0 0.4rem;
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.75;
  color: var(--mist);
}

.page-about .team-figure {
  margin: 1.4rem 0 0;
  border: 2px solid var(--line);
  background: var(--stratum);
  padding: 0.7rem;
}

.page-about .team-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
}

.page-about .team-figure__cap {
  margin-top: 0.55rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  color: var(--mist);
  letter-spacing: 0.04em;
}

/* ---------- 04 认证 ---------- */
.page-about .cert-grid {
  display: grid;
  gap: 0.9rem;
}

.page-about .cert-card {
  border: 2px solid var(--ab-gold-line);
  background: linear-gradient(165deg, rgba(201, 164, 92, 0.08), var(--stratum) 62%);
  box-shadow: var(--shadow-hard);
  transition: border-color 0.2s var(--ease);
}

.page-about .cert-card:hover,
.page-about .cert-card[open] {
  border-color: var(--gold);
}

.page-about .cert-card summary {
  list-style: none;
  cursor: pointer;
  padding: 0.95rem 1rem;
  display: grid;
  grid-template-columns: auto 1fr;
  grid-template-areas:
    "badge title"
    "badge hint";
  align-items: center;
  gap: 0.15rem 0.7rem;
}

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

.page-about .cert-card summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -4px;
}

.page-about .cert-badge {
  grid-area: badge;
  width: 42px;
  height: 42px;
  display: grid;
  place-items: center;
  font-family: var(--font-mono);
  font-size: 0.62rem;
  letter-spacing: 0.06em;
  color: var(--ink);
  background: var(--gold);
  border-radius: 50%;
  box-shadow: 0 0 0 3px var(--ab-gold-soft);
}

.page-about .cert-card__title {
  grid-area: title;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 1rem;
  color: var(--bone);
}

.page-about .cert-card__hint {
  grid-area: hint;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.08em;
  color: var(--mist);
}

.page-about .cert-card[open] .cert-card__hint::after {
  content: " · 已展开";
  color: var(--gold);
}

.page-about .cert-card p {
  margin: 0;
  padding: 0 1rem;
  font-size: 0.88rem;
  color: var(--mist);
}

.page-about .cert-card p:last-child {
  padding-bottom: 1rem;
  margin-top: 0.5rem;
}

/* ---------- 05 生态 ---------- */
.page-about .eco-grid {
  display: grid;
  gap: 1.5rem;
  align-items: start;
}

.page-about .eco-tags {
  list-style: none;
  display: flex;
  flex-wrap: wrap;
  gap: 0.45rem;
  margin: 1rem 0 1.1rem;
  padding: 0;
}

.page-about .eco-tags li {
  font-family: var(--font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.06em;
  color: var(--cyan);
  border: 1px solid var(--line-cyan);
  padding: 0.22rem 0.55rem;
  background: rgba(53, 214, 232, 0.06);
}

.page-about .eco-figure {
  margin: 0;
  border: 2px solid var(--line);
  border-top: 6px solid var(--clay);
  background: var(--ink);
  padding: 0.75rem;
  box-shadow: var(--shadow-hard);
}

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

.page-about .eco-figure__cap {
  margin-top: 0.6rem;
  font-family: var(--font-mono);
  font-size: 0.7rem;
  line-height: 1.65;
  color: var(--mist);
}

/* ---------- 06 价值与路线 ---------- */
.page-about .value-grid {
  list-style: none;
  margin: 0 0 1.6rem;
  padding: 0;
  display: grid;
  gap: 0.8rem;
}

.page-about .value-card {
  position: relative;
  border: 2px solid var(--line);
  background: var(--slate);
  padding: 1rem 1rem 1rem 1.05rem;
  overflow: hidden;
}

.page-about .value-card::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 5px;
  background: var(--orange);
}

.page-about .value-card:nth-child(2)::before {
  background: var(--cyan);
}

.page-about .value-card:nth-child(3)::before {
  background: var(--moss);
}

.page-about .value-card:nth-child(4)::before {
  background: var(--clay);
}

.page-about .value-card__no {
  font-family: var(--font-mono);
  font-size: 0.68rem;
  letter-spacing: 0.16em;
  color: var(--mist);
}

.page-about .value-card h3 {
  font-size: 1.02rem;
  margin: 0.25rem 0 0.45rem;
}

.page-about .value-card p {
  margin: 0;
  font-size: 0.87rem;
  line-height: 1.78;
  color: var(--mist);
}

.page-about .road-panel {
  border: 2px dashed var(--line);
  background: rgba(44, 52, 59, 0.5);
  padding: 1.1rem;
}

.page-about .road-panel__title {
  font-size: 1rem;
  margin-bottom: 0.9rem;
  color: var(--cyan);
}

.page-about .road-list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 0.85rem;
}

.page-about .road-list li {
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--mist);
  padding-left: 0.1rem;
}

.page-about .road-list__no {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 0.66rem;
  letter-spacing: 0.12em;
  color: var(--ink);
  background: var(--gold);
  padding: 0.1rem 0.4rem;
  margin-right: 0.5rem;
  vertical-align: 1px;
}

.page-about .about-cta {
  margin-top: 1.8rem;
  border: 2px solid var(--line);
  border-left: 6px solid var(--orange);
  background:
    linear-gradient(120deg, var(--ab-orange-soft), transparent 52%),
    var(--stratum);
  padding: 1.2rem 1.1rem;
  box-shadow: var(--shadow-hard);
}

.page-about .about-cta__text {
  font-size: 0.92rem;
  color: var(--bone);
  margin-bottom: 0.9rem;
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.6rem;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .about-strip {
    grid-template-columns: repeat(5, minmax(0, 1fr));
  }

  .page-about .about-strip__item {
    padding: 1rem 1rem 1.1rem;
  }

  .page-about .about-sec {
    padding: 4rem 0;
  }

  .page-about .origin-grid {
    grid-template-columns: minmax(0, 1.25fr) minmax(0, 0.85fr);
    gap: 2rem;
    align-items: start;
  }

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

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

  .page-about .cert-card:first-child {
    grid-column: 1 / -1;
  }

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

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 2rem;
  }
}

@media (min-width: 1024px) {
  .page-about .about-cover {
    padding-top: calc(var(--header-h) + 2.6rem);
  }

  .page-about .about-cover__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, 0.88fr);
    gap: 3rem;
    align-items: end;
  }

  .page-about .about-cover h1 {
    font-size: clamp(2.4rem, 3.6vw, 3.5rem);
  }

  .page-about .about-strip {
    margin-top: 3rem;
  }

  .page-about .about-sec {
    padding: 5rem 0;
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.92fr) minmax(0, 1.08fr);
    gap: 1.8rem;
    align-items: start;
  }

  .page-about .team-graph-panel {
    position: sticky;
    top: calc(var(--header-h) + 1.2rem);
  }

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

  .page-about .cert-card:first-child {
    grid-column: auto;
  }

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

  .page-about .road-panel {
    padding: 1.4rem 1.5rem;
  }

  .page-about .about-cta {
    display: flex;
    align-items: center;
    justify-content: space-between;
    gap: 1.6rem;
    padding: 1.5rem 1.6rem;
  }

  .page-about .about-cta__text {
    margin-bottom: 0;
    max-width: 30rem;
  }

  .page-about .about-cta__actions {
    flex-wrap: nowrap;
  }
}

@media (min-width: 1180px) {
  .page-about .tl-item {
    max-width: 60rem;
  }

  .page-about .tl-item:nth-child(even) {
    margin-left: 3.5rem;
  }

  .page-about .tl-item:nth-child(odd) {
    margin-right: 3.5rem;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .tl-card,
  .page-about .team-card,
  .page-about .tg-node,
  .page-about .cert-card {
    transition: none;
  }

  .page-about .tl-card:hover,
  .page-about .team-card:hover {
    transform: none;
  }
}