.page-about {
  --about-flow: clamp(26px, 4vw, 52px);
  --about-card-pad: clamp(20px, 2.6vw, 30px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding-bottom: clamp(44px, 7vw, 92px);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  z-index: -1;
  top: -70px;
  right: -10%;
  width: min(560px, 48%);
  height: 320px;
  background: linear-gradient(135deg, rgba(40, 224, 208, 0.17), rgba(255, 179, 71, 0.07) 62%, transparent);
  clip-path: polygon(20% 0, 100% 0, 100% 72%, 0 100%);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  gap: clamp(22px, 3vw, 34px);
  margin-top: clamp(18px, 2.8vw, 32px);
}

.page-about .about-hero-copy h1 {
  margin: 0.45rem 0 0;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(2rem, 6vw, 4rem);
  line-height: 1.05;
  letter-spacing: -0.02em;
}

.page-about .about-hero-copy .lede {
  margin: clamp(16px, 2vw, 24px) 0 0;
  max-width: 60ch;
  font-size: clamp(1rem, 1.3vw, 1.125rem);
  line-height: 1.75;
  color: var(--fg-dim);
}

.page-about .about-hero-note {
  margin: 16px 0 0;
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  line-height: 1.6;
}

.page-about .about-hero-media {
  margin: 0;
  border: 1px solid var(--hair-strong);
}

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

@media (min-width: 920px) {
  .page-about .about-hero-grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: clamp(30px, 4vw, 60px);
  }
}

/* ---------- 起点 三张牌 ---------- */
.page-about .about-origin-grid {
  margin-top: var(--about-flow);
  gap: clamp(14px, 1.8vw, 22px);
}

.page-about .about-origin-card {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: var(--about-card-pad);
  border: 1px solid var(--hair-strong);
  background: linear-gradient(180deg, rgba(18, 59, 68, 0.4), rgba(6, 16, 28, 0.18));
  position: relative;
}

.page-about .about-origin-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 38px;
  height: 1px;
  background: var(--cyan);
  opacity: 0.7;
}

.page-about .about-origin-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(1.1rem, 1.7vw, 1.4rem);
  line-height: 1.28;
  letter-spacing: -0.005em;
}

.page-about .about-origin-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--fg-dim);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: var(--about-flow) 0 0;
  padding: 0;
}

.page-about .about-tl-item {
  position: relative;
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  gap: 16px;
  padding-bottom: clamp(18px, 2.4vw, 26px);
}

.page-about .about-tl-item:not(:last-child)::before {
  content: "";
  position: absolute;
  left: 19.5px;
  top: 26px;
  bottom: -2px;
  width: 1px;
  background: linear-gradient(180deg, rgba(199, 211, 221, 0.42), rgba(199, 211, 221, 0.12));
}

.page-about .about-tl-axis {
  position: relative;
  display: flex;
  justify-content: center;
  padding-top: 9px;
}

.page-about .about-tl-dot {
  display: block;
  width: 11px;
  height: 11px;
  border: 1px solid var(--cyan);
  background: var(--ink);
  transform: rotate(45deg);
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-tl-item.is-current .about-tl-dot {
  border-color: var(--amber);
  background: var(--amber);
}

.page-about .about-tl-body {
  border: 1px solid var(--hair-strong);
  background: rgba(6, 16, 28, 0.44);
  transition: border-color 0.3s var(--ease);
}

.page-about .about-tl-body:hover {
  border-color: rgba(40, 224, 208, 0.42);
}

.page-about .about-tl-item.is-current .about-tl-body {
  border-color: rgba(255, 179, 71, 0.45);
}

.page-about .about-tl-heading {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .about-tl-trigger {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) 14px;
  align-items: center;
  gap: 14px;
  width: 100%;
  padding: clamp(13px, 1.7vw, 19px) clamp(15px, 2vw, 23px);
  background: none;
  border: 0;
  text-align: left;
  color: inherit;
  font: inherit;
  cursor: pointer;
}

.page-about .about-tl-ver {
  font-family: var(--font-mono);
  font-size: 0.8125rem;
  font-weight: 500;
  letter-spacing: 0.04em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .about-tl-item.is-current .about-tl-ver {
  color: var(--amber);
}

.page-about .about-tl-name {
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(1.05rem, 1.7vw, 1.35rem);
  line-height: 1.25;
  letter-spacing: -0.005em;
}

.page-about .accordion-icon {
  flex: 0 0 auto;
  width: 11px;
  height: 11px;
  border-right: 1px solid var(--cyan);
  border-bottom: 1px solid var(--cyan);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform 0.3s var(--ease);
}

.page-about [aria-expanded="true"] .accordion-icon {
  transform: rotate(-135deg) translate(-2px, -2px);
}

.page-about .about-tl-body .accordion-panel-inner {
  padding: 0 clamp(15px, 2vw, 23px) clamp(15px, 2vw, 21px);
  color: var(--fg-dim);
  font-size: 0.9375rem;
  line-height: 1.78;
}

.page-about .about-tl-body .accordion-panel-inner p {
  margin: 0 0 10px;
}

.page-about .about-tl-body .accordion-panel-inner p:last-child {
  margin-bottom: 0;
}

.page-about .about-tl-body .accordion-panel-inner a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-tl-figure {
  list-style: none;
  margin: 0 0 clamp(18px, 2.4vw, 26px) 56px;
  padding: 0;
}

.page-about .about-tl-media {
  margin: 0;
  border: 1px solid var(--hair);
}

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

@media (max-width: 640px) {
  .page-about .about-tl-figure {
    margin-left: 0;
  }
}

/* ---------- 服务范围：标签切换 ---------- */
.page-about .about-reach-tabs {
  margin-top: var(--about-flow);
  border: 1px solid var(--hair-strong);
  background: rgba(6, 16, 28, 0.38);
}

.page-about .about-reach-tabs .tablist {
  display: flex;
  border-bottom: 1px solid var(--hair-strong);
}

.page-about .about-reach-tabs .tab {
  flex: 1 1 0;
  padding: clamp(13px, 1.6vw, 17px) clamp(12px, 1.8vw, 22px);
  background: none;
  border: 0;
  border-bottom: 1px solid transparent;
  color: var(--fg-dim);
  font-family: var(--font-head);
  font-size: 0.95rem;
  letter-spacing: 0.03em;
  cursor: pointer;
  transition: color 0.25s var(--ease), border-color 0.25s var(--ease), background-color 0.25s var(--ease);
}

.page-about .about-reach-tabs .tab:hover {
  color: var(--mist);
  background: rgba(40, 224, 208, 0.06);
}

.page-about .about-reach-tabs .tab[aria-selected="true"] {
  color: var(--mist);
  border-bottom-color: var(--cyan);
  background: rgba(40, 224, 208, 0.09);
}

.page-about .about-reach-panel {
  padding: clamp(20px, 2.8vw, 34px);
}

.page-about .about-reach-lead {
  margin: 0 0 clamp(16px, 2vw, 22px);
  font-size: 1rem;
  line-height: 1.75;
  color: var(--fg);
  max-width: 66ch;
}

.page-about .about-reach-facts {
  margin: 0;
  border-top: 1px solid var(--hair);
  display: grid;
}

.page-about .about-reach-facts > div {
  display: grid;
  grid-template-columns: minmax(72px, auto) minmax(0, 1fr);
  gap: 14px;
  padding: 12px 0;
  border-bottom: 1px solid var(--hair);
}

.page-about .about-reach-facts dt {
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.06em;
  color: var(--fg-faint);
  padding-top: 3px;
}

.page-about .about-reach-facts dd {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.62;
  word-break: break-word;
}

.page-about .about-reach-note {
  margin: clamp(16px, 2vw, 22px) 0 0;
  font-size: 0.875rem;
  line-height: 1.72;
  color: var(--fg-dim);
  padding-left: 14px;
  border-left: 2px solid var(--amber);
  max-width: 64ch;
}

@media (min-width: 700px) {
  .page-about .about-reach-facts > div {
    grid-template-columns: 120px minmax(0, 1fr);
  }
}

/* ---------- 团队 ---------- */
.page-about .about-team-grid {
  margin-top: var(--about-flow);
  gap: clamp(14px, 1.8vw, 22px);
}

.page-about .about-team-card {
  display: flex;
  flex-direction: column;
  gap: 11px;
  padding: var(--about-card-pad);
  border: 1px solid var(--hair-strong);
  background: rgba(10, 27, 46, 0.72);
  transition: border-color 0.3s var(--ease), background-color 0.3s var(--ease);
}

.page-about .about-team-card:hover {
  border-color: rgba(40, 224, 208, 0.45);
  background: rgba(18, 59, 68, 0.55);
}

.page-about .about-team-index {
  font-family: var(--font-mono);
  font-size: 0.6875rem;
  letter-spacing: 0.14em;
  color: var(--fg-faint);
}

.page-about .about-team-card h3 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 500;
  font-size: clamp(1.1rem, 1.7vw, 1.4rem);
  line-height: 1.28;
}

.page-about .about-team-card > p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.72;
  color: var(--fg-dim);
}

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

.page-about .about-team-list li {
  padding: 4px 9px;
  border: 1px solid var(--hair-strong);
  font-family: var(--font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.03em;
  color: var(--fg-dim);
}

.page-about .about-team-media {
  margin: clamp(20px, 3vw, 32px) 0 0;
  border: 1px solid var(--hair);
}

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

/* ---------- 合作生态 ---------- */
.page-about .about-eco-grid {
  margin-top: var(--about-flow);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--hair-strong);
  border: 1px solid var(--hair-strong);
}

.page-about .about-eco-node {
  position: relative;
  padding: clamp(20px, 2.6vw, 30px) clamp(16px, 2vw, 22px);
  background: var(--ink);
  transition: background-color 0.3s var(--ease);
}

.page-about .about-eco-node:hover,
.page-about .about-eco-node:focus-within {
  background: var(--teal-deep);
}

.page-about .about-eco-node:focus-visible {
  outline: 1px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-eco-dot {
  display: block;
  width: 8px;
  height: 8px;
  margin-bottom: 14px;
  border: 1px solid var(--cyan);
  transform: rotate(45deg);
  transition: background-color 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .about-eco-node:hover .about-eco-dot,
.page-about .about-eco-node:focus-within .about-eco-dot {
  background: var(--amber);
  border-color: var(--amber);
}

.page-about .about-eco-name {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(1.05rem, 1.6vw, 1.25rem);
  line-height: 1.25;
}

.page-about .about-eco-detail {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 0.75rem;
  line-height: 1.6;
  letter-spacing: 0.02em;
  color: var(--fg-dim);
  transition: opacity 0.3s var(--ease), transform 0.3s var(--ease);
}

.page-about .about-eco-note {
  margin: clamp(16px, 2vw, 22px) 0 0;
  font-size: 0.875rem;
  line-height: 1.72;
}

.page-about .about-eco-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

@media (min-width: 860px) {
  .page-about .about-eco-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-eco-detail {
    opacity: 0;
    transform: translateY(-4px);
  }

  .page-about .about-eco-node:hover .about-eco-detail,
  .page-about .about-eco-node:focus-within .about-eco-detail {
    opacity: 1;
    transform: none;
  }
}

/* ---------- 季度修订 ---------- */
.page-about .about-cycle-table {
  margin-top: var(--about-flow);
}

.page-about .about-cycle-table td {
  vertical-align: top;
  line-height: 1.6;
}

.page-about .about-cycle-note {
  margin: clamp(16px, 2vw, 24px) 0 0;
  font-size: 0.9375rem;
  line-height: 1.75;
  color: var(--fg-dim);
  max-width: 68ch;
}

.page-about .about-cycle-note a {
  color: var(--cyan);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 收尾 ---------- */
.page-about .about-close {
  border-top: 1px solid var(--hair-strong);
  background: linear-gradient(135deg, rgba(18, 59, 68, 0.62), rgba(6, 16, 28, 0.12));
}

.page-about .about-close-inner {
  display: grid;
  gap: 18px;
  max-width: 720px;
}

.page-about .about-close h2 {
  margin: 0;
  font-family: var(--font-head);
  font-weight: 400;
  font-size: clamp(1.5rem, 3.4vw, 2.35rem);
  line-height: 1.12;
  letter-spacing: -0.015em;
}

.page-about .about-close p {
  margin: 0;
  font-size: 0.9688rem;
  line-height: 1.78;
  color: var(--fg-dim);
}

.page-about .about-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 4px;
}

/* ---------- 窄屏保护 ---------- */
@media (max-width: 480px) {
  .page-about .about-hero::before {
    width: 76%;
    height: 200px;
    opacity: 0.7;
  }

  .page-about .about-tl-item {
    grid-template-columns: 30px minmax(0, 1fr);
    gap: 12px;
  }

  .page-about .about-tl-item:not(:last-child)::before {
    left: 14.5px;
  }

  .page-about .about-tl-trigger {
    grid-template-columns: minmax(0, 1fr) 14px;
    row-gap: 6px;
  }

  .page-about .about-tl-ver {
    grid-column: 1 / -1;
  }

  .page-about .about-reach-facts > div {
    grid-template-columns: minmax(0, 1fr);
    gap: 4px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .accordion-icon,
  .page-about .about-eco-detail,
  .page-about .about-eco-dot,
  .page-about .about-tl-dot {
    transition: none;
  }
}