.page-about {
  --about-glow-cyan: rgba(55, 242, 224, 0.55);
  --about-glow-violet: rgba(138, 92, 255, 0.45);
  --about-hair: rgba(44, 58, 99, 0.55);
  position: relative;
  background:
    radial-gradient(120% 55% at 88% -6%, rgba(22, 32, 63, 0.95) 0%, rgba(7, 10, 18, 0) 62%),
    var(--ink);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 32px 0 56px;
  overflow: hidden;
}

.page-about .about-hero__pattern {
  position: absolute;
  inset: 0;
  pointer-events: none;
  background-image:
    repeating-radial-gradient(130% 95% at 86% -14%, transparent 0 44px, rgba(55, 242, 224, 0.052) 44px 45px),
    repeating-radial-gradient(130% 95% at 86% -14%, transparent 0 88px, rgba(138, 92, 255, 0.046) 88px 89px);
  mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0) 78%);
  -webkit-mask-image: linear-gradient(180deg, rgba(0, 0, 0, 0.9), rgba(0, 0, 0, 0) 78%);
}

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

.page-about .breadcrumb {
  margin-bottom: 22px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 34px;
}

.page-about .about-hero__title {
  margin: 12px 0 0;
  font-size: clamp(2.1rem, 8.4vw, 4.1rem);
  line-height: 1.08;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 46ch;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 28px;
}

.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 14px;
  margin: 34px 0 0;
  padding: 20px 0 0;
  border-top: 1px solid var(--about-hair);
  list-style: none;
}

.page-about .about-stats li {
  display: flex;
  flex-direction: column;
  gap: 6px;
  min-width: 0;
}

.page-about .about-stats__num {
  font-family: var(--font-mono);
  font-size: clamp(1.25rem, 5vw, 1.7rem);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--cyan);
}

.page-about .about-stats li:nth-child(2) .about-stats__num {
  color: var(--violet);
}

.page-about .about-stats li:nth-child(3) .about-stats__num {
  color: var(--gold);
}

.page-about .about-stats__label {
  font-size: var(--fs-12);
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-hero__art {
  position: relative;
  isolation: isolate;
}

.page-about .about-hero__glow {
  position: absolute;
  inset: 10% -5% -13% 5%;
  z-index: -1;
  border-radius: var(--r-xl);
  background: linear-gradient(128deg, rgba(55, 242, 224, 0.28), rgba(138, 92, 255, 0.2) 48%, rgba(255, 154, 60, 0.16));
  transform: skewY(-6.5deg);
  filter: blur(22px);
  opacity: 0.85;
}

.page-about .about-hero__media {
  position: relative;
  z-index: 1;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  box-shadow: var(--shadow-lg);
}

.page-about .about-hero__media .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 16 / 10;
  object-fit: cover;
}

.page-about .about-hero__media .media__caption {
  padding: 12px 16px 14px;
  font-size: var(--fs-12);
  color: var(--muted);
}

/* ---------- 主体两栏 ---------- */
.page-about .about-layout {
  display: grid;
  gap: 8px;
  padding-bottom: 8px;
}

.page-about .about-toc {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding: 4px 0 16px;
  border-bottom: 1px solid var(--about-hair);
  scrollbar-width: none;
}

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

.page-about .about-toc__head {
  display: none;
  margin: 0;
}

.page-about .about-toc .toc__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  white-space: nowrap;
  padding: 8px 14px;
  border: 1px solid var(--about-hair);
  border-radius: var(--r-pill);
  font-size: var(--fs-14);
  color: var(--muted);
  text-decoration: none;
  transition: color 0.3s var(--ease), border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .about-toc .toc__no {
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.12em;
  color: var(--cyan);
}

.page-about .about-toc .toc__link:hover {
  color: var(--text);
  border-color: var(--cyan);
}

.page-about .about-toc .toc__link.is-active {
  color: var(--text);
  border-color: var(--cyan);
  background: rgba(55, 242, 224, 0.09);
}

/* ---------- 区块骨架 ---------- */
.page-about .about-main {
  min-width: 0;
}

.page-about .about-section {
  padding: 52px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .about-section:first-child {
  border-top: 0;
}

.page-about .section-head__title {
  margin: 10px 0 0;
  font-size: clamp(1.55rem, 5.4vw, 2.3rem);
  line-height: 1.28;
  letter-spacing: -0.005em;
  color: var(--text);
}

.page-about .section-head__title em {
  font-style: normal;
  color: var(--cyan);
}

.page-about .section-head__note {
  margin: 12px 0 0;
  max-width: 54ch;
  font-size: var(--fs-14);
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 三条主线 ---------- */
.page-about .lanes {
  margin-top: 36px;
}

.page-about .lane {
  display: grid;
  gap: 12px;
  padding: 26px 0;
  border-top: 1px solid var(--about-hair);
}

.page-about .lane:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .lane__no {
  font-family: var(--font-mono);
  font-size: 2.2rem;
  font-weight: 700;
  line-height: 1;
  color: rgba(55, 242, 224, 0.28);
  -webkit-text-stroke: 1px rgba(55, 242, 224, 0.55);
}

.page-about .lane__main {
  min-width: 0;
}

.page-about .lane__title {
  margin: 0;
  font-size: var(--fs-22);
  line-height: 1.4;
  color: var(--text);
}

.page-about .lane__text {
  margin: 10px 0 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .lane__meta {
  display: flex;
  flex-wrap: wrap;
  gap: 8px 20px;
  margin: 14px 0 0;
  padding: 0;
  list-style: none;
  font-size: var(--fs-12);
  color: var(--muted);
}

.page-about .lane__meta li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .lane__meta li::before {
  content: "";
  width: 6px;
  height: 6px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 8px var(--about-glow-cyan);
}

.page-about .lane:nth-child(2) .lane__meta li::before {
  background: var(--violet);
  box-shadow: 0 0 8px var(--about-glow-violet);
}

.page-about .lane:nth-child(3) .lane__meta li::before {
  background: var(--gold);
  box-shadow: 0 0 8px rgba(255, 154, 60, 0.5);
}

.page-about .lane__cta {
  margin-top: 16px;
}

/* ---------- 时间轴 ---------- */
.page-about .timeline {
  position: relative;
  margin: 36px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--about-glow-cyan), rgba(138, 92, 255, 0.35) 58%, rgba(255, 154, 60, 0.12));
  opacity: 0.6;
}

.page-about .timeline__item {
  position: relative;
  margin-left: 0;
  padding-left: 26px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 26px;
  width: 5px;
  height: 5px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px var(--about-glow-cyan);
}

.page-about .timeline__node {
  border-radius: var(--r-md);
  border: 1px solid transparent;
  transition: border-color 0.3s var(--ease), background 0.3s var(--ease);
}

.page-about .timeline__node:hover {
  border-color: var(--about-hair);
  background: rgba(22, 32, 63, 0.42);
}

.page-about .timeline__node[open] {
  border-color: rgba(55, 242, 224, 0.35);
  background: rgba(14, 23, 51, 0.62);
}

.page-about .timeline__summary {
  display: grid;
  grid-template-columns: minmax(66px, auto) minmax(0, 1fr) auto;
  gap: 4px 16px;
  align-items: baseline;
  padding: 18px 14px;
  cursor: pointer;
  list-style: none;
}

.page-about .timeline__summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__summary::marker {
  content: "";
}

.page-about .timeline__summary::after {
  content: "＋";
  font-size: var(--fs-14);
  color: var(--muted);
  transition: color 0.3s var(--ease);
}

.page-about .timeline__node[open] .timeline__summary::after {
  content: "－";
  color: var(--cyan);
}

.page-about .timeline__num {
  font-family: var(--font-mono);
  font-size: clamp(1.5rem, 7vw, 1.9rem);
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  color: var(--gold);
}

.page-about .timeline__node[open] .timeline__num {
  color: var(--cyan);
}

.page-about .timeline__head {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 8px 12px;
  min-width: 0;
}

.page-about .timeline__title {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.5;
  color: var(--text);
}

.page-about .timeline__label {
  font-size: var(--fs-12);
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .timeline__body {
  padding: 0 14px 20px 14px;
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 60ch;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 26px;
  margin-top: 36px;
}

.page-about .team-media {
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
  background: rgba(22, 32, 63, 0.5);
}

.page-about .team-media .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .team-media .media__caption {
  padding: 12px 16px 14px;
  font-size: var(--fs-12);
  color: var(--muted);
}

.page-about .squads {
  display: grid;
  gap: 14px;
}

.page-about .squad {
  padding: 20px;
  border-radius: var(--r-md);
  border: 1px solid var(--about-hair);
  background: linear-gradient(160deg, rgba(22, 32, 63, 0.72), rgba(14, 23, 51, 0.5));
  transition: transform 0.3s var(--ease), border-color 0.3s var(--ease);
}

.page-about .squad:hover {
  transform: translateY(-4px);
  border-color: rgba(55, 242, 224, 0.4);
}

.page-about .squad__head {
  display: flex;
  align-items: center;
  gap: 10px;
}

.page-about .squad__title {
  margin: 0;
  font-size: var(--fs-17);
  color: var(--text);
}

.page-about .squad__text {
  margin: 10px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .squad__meta {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-hair);
  font-family: var(--font-mono);
  font-size: var(--fs-12);
  letter-spacing: 0.06em;
  color: var(--cyan);
}

/* ---------- 合作生态 ---------- */
.page-about .eco-banner {
  margin-top: 32px;
  border-radius: var(--r-lg);
  overflow: hidden;
  border: 1px solid var(--about-hair);
}

.page-about .eco-banner .media__img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 12 / 7;
  object-fit: cover;
}

.page-about .eco-banner .media__caption {
  padding: 12px 16px 14px;
  font-size: var(--fs-12);
  color: var(--muted);
}

.page-about .eco-grid {
  display: grid;
  gap: 30px;
  margin-top: 32px;
}

.page-about .eco-map {
  position: relative;
  padding: 8px;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-hair);
  background:
    radial-gradient(70% 70% at 50% 50%, rgba(138, 92, 255, 0.12), rgba(7, 10, 18, 0) 72%),
    rgba(14, 23, 51, 0.5);
}

.page-about .eco-svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .eco-link {
  stroke: var(--line);
  stroke-width: 1;
  stroke-dasharray: 3 9;
  animation: about-eco-flow 7s linear infinite;
}

.page-about .eco-link:nth-child(2n) {
  animation-duration: 9s;
  animation-delay: -2s;
}

.page-about .eco-link:nth-child(3n) {
  animation-duration: 11s;
  animation-delay: -4s;
}

@keyframes about-eco-flow {
  from {
    stroke-dashoffset: 0;
  }
  to {
    stroke-dashoffset: -72;
  }
}

.page-about .eco-node circle {
  fill: var(--indigo);
  stroke: rgba(55, 242, 224, 0.65);
  stroke-width: 1.2;
  transition: fill 0.3s var(--ease), stroke 0.3s var(--ease);
}

.page-about .eco-node:nth-of-type(2n) circle {
  stroke: rgba(138, 92, 255, 0.75);
}

.page-about .eco-node:nth-of-type(3n) circle {
  stroke: rgba(255, 154, 60, 0.7);
}

.page-about .eco-node:hover circle,
.page-about .eco-node:focus-visible circle {
  fill: rgba(55, 242, 224, 0.22);
  stroke: var(--cyan);
  outline: none;
}

.page-about .eco-node__label {
  fill: var(--muted);
  font-family: var(--font-sans);
  font-size: 15px;
  text-anchor: middle;
  opacity: 0.55;
  transition: opacity 0.3s var(--ease), fill 0.3s var(--ease);
}

.page-about .eco-node:hover .eco-node__label,
.page-about .eco-node:focus-visible .eco-node__label {
  opacity: 1;
  fill: var(--text);
}

.page-about .eco-hub__ring {
  fill: none;
  stroke: rgba(138, 92, 255, 0.55);
  stroke-width: 1;
  stroke-dasharray: 2 6;
}

.page-about .eco-hub__core {
  fill: rgba(55, 242, 224, 0.1);
  stroke: var(--cyan);
  stroke-width: 1.2;
}

.page-about .eco-hub__text {
  fill: var(--text);
  font-family: var(--font-sans);
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 0.08em;
  text-anchor: middle;
}

.page-about .eco-text {
  margin: 0;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .eco-points {
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 12px;
}

.page-about .eco-points li {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding-bottom: 12px;
  border-bottom: 1px dashed var(--about-hair);
  font-size: var(--fs-14);
  line-height: 1.7;
  color: var(--muted);
}

.page-about .eco-points .num {
  font-family: var(--font-mono);
  font-size: var(--fs-22);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--cyan);
}

.page-about .eco-side .btn {
  margin-top: 22px;
}

/* ---------- 服务节奏 ---------- */
.page-about .cadence {
  display: grid;
  gap: 18px;
  margin-top: 36px;
}

.page-about .cadence__col {
  padding: 24px 22px;
  border-radius: var(--r-lg);
  border: 1px solid var(--about-hair);
  background: linear-gradient(150deg, rgba(22, 32, 63, 0.8), rgba(14, 23, 51, 0.42));
}

.page-about .cadence__col:nth-child(2) {
  background: linear-gradient(150deg, rgba(138, 92, 255, 0.16), rgba(14, 23, 51, 0.5));
}

.page-about .cadence__title {
  margin: 0;
  font-size: var(--fs-22);
  line-height: 1.4;
  color: var(--text);
}

.page-about .cadence__text {
  margin: 12px 0 0;
  font-size: var(--fs-14);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .cadence__col .btn {
  margin-top: 18px;
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  position: relative;
  margin-top: 24px;
  padding: 56px 0 72px;
  border-top: 1px solid var(--about-hair);
  overflow: hidden;
}

.page-about .about-cta__inner {
  position: relative;
  isolation: isolate;
}

.page-about .about-cta__glow {
  position: absolute;
  inset: -40% -20% -60% 30%;
  z-index: -1;
  background:
    radial-gradient(50% 60% at 60% 50%, rgba(255, 154, 60, 0.2), rgba(7, 10, 18, 0) 70%),
    radial-gradient(60% 70% at 20% 60%, rgba(55, 242, 224, 0.16), rgba(7, 10, 18, 0) 72%);
  filter: blur(6px);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(1.6rem, 6vw, 2.5rem);
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-cta__text {
  margin: 14px 0 0;
  max-width: 46ch;
  font-size: var(--fs-17);
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

/* ---------- 断点 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 44px 0 72px;
  }

  .page-about .eco-points {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .eco-points li {
    flex-direction: column;
    gap: 6px;
    border-bottom: 0;
    border-left: 2px solid var(--about-hair);
    padding: 0 0 0 14px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: center;
    gap: 48px;
  }

  .page-about .about-hero__lead {
    font-size: var(--fs-17);
  }

  .page-about .team-grid {
    grid-template-columns: minmax(0, 0.95fr) minmax(0, 1.05fr);
    align-items: start;
    gap: 32px;
  }

  .page-about .eco-grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    align-items: start;
    gap: 40px;
  }

  .page-about .timeline__item:nth-child(2) {
    margin-left: 22px;
  }

  .page-about .timeline__item:nth-child(3) {
    margin-left: 44px;
  }

  .page-about .timeline__item:nth-child(4) {
    margin-left: 66px;
  }

  .page-about .timeline__item:nth-child(5) {
    margin-left: 88px;
  }

  .page-about .timeline__item:nth-child(6) {
    margin-left: 110px;
  }

  .page-about .timeline {
    padding-bottom: 18px;
  }

  .page-about .timeline::before {
    transform: rotate(2.6deg);
    transform-origin: top left;
  }
}

@media (min-width: 1000px) {
  .page-about .about-layout {
    grid-template-columns: 200px minmax(0, 1fr);
    gap: 60px;
    align-items: start;
  }

  .page-about .about-toc {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding: 0;
    border-bottom: 0;
    border-left: 2px solid var(--about-hair);
  }

  .page-about .about-toc__head {
    display: block;
    padding: 0 0 14px 18px;
    font-family: var(--font-mono);
    font-size: var(--fs-12);
    letter-spacing: 0.24em;
    color: var(--muted);
  }

  .page-about .about-toc .toc__link {
    position: relative;
    border: 0;
    border-radius: 0;
    padding: 10px 16px;
    background: transparent;
  }

  .page-about .about-toc .toc__link::before {
    content: "";
    position: absolute;
    left: -2px;
    top: 0;
    bottom: 0;
    width: 2px;
    background: transparent;
    transition: background 0.3s var(--ease);
  }

  .page-about .about-toc .toc__link.is-active::before {
    background: var(--cyan);
    box-shadow: 0 0 12px var(--about-glow-cyan);
  }

  .page-about .about-toc .toc__link.is-active {
    background: linear-gradient(90deg, rgba(55, 242, 224, 0.1), rgba(55, 242, 224, 0));
  }

  .page-about .about-section {
    padding: 72px 0;
  }

  .page-about .lane {
    grid-template-columns: 96px minmax(0, 1fr);
    gap: 0 28px;
    align-items: start;
    padding: 32px 0;
  }

  .page-about .lane__no {
    font-size: 3rem;
  }

  .page-about .timeline__summary {
    padding: 20px 18px;
  }

  .page-about .timeline__body {
    padding: 0 18px 24px 18px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .eco-link {
    animation: none;
  }

  .page-about .squad:hover {
    transform: none;
  }
}