.page-about {
  --about-paper-ink: #0d1a16;
  --about-paper-soft: rgba(8, 16, 14, .72);
  --about-paper-line: rgba(8, 16, 14, .14);
  background: var(--ink);
  color: var(--ink-soft);
  font-family: var(--font-body);
  line-height: 1.75;
  overflow-x: hidden;
}

.page-about img {
  max-width: 100%;
  height: auto;
}

.page-about .section {
  padding: 46px 0;
}

.page-about .breadcrumbs {
  padding-top: 22px;
}

.page-about .breadcrumbs__list {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px;
  margin: 0;
  padding: 0;
  list-style: none;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .05em;
}

.page-about .breadcrumbs__link {
  color: var(--ink-mute);
  text-decoration: none;
}

.page-about .breadcrumbs__link:hover,
.page-about .breadcrumbs__link:focus-visible {
  color: var(--mint);
}

.page-about .breadcrumbs__sep {
  color: var(--sage);
}

.page-about .breadcrumbs__current {
  color: var(--paper);
}

.page-about .kicker {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(29px, 6.2vw, 52px);
  line-height: 1.18;
  letter-spacing: .04em;
  color: var(--paper);
}

.page-about .section__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(23px, 4.2vw, 34px);
  line-height: 1.24;
  letter-spacing: .035em;
  color: var(--paper);
}

.page-about .section__lead {
  margin: 0 0 26px;
  max-width: 62ch;
  font-size: 15.5px;
  color: var(--ink-soft);
}

/* 开篇 */
.page-about .about-open {
  padding-top: 16px;
}

.page-about .about-open__grid {
  display: grid;
  gap: 30px;
}

.page-about .about-open__lead {
  margin: 0 0 14px;
  max-width: 30em;
  font-size: 17px;
  color: var(--paper);
}

.page-about .about-open__body {
  margin: 0 0 26px;
  max-width: 34em;
  font-size: 15.5px;
  color: var(--ink-soft);
}

.page-about .about-open__stats {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(126px, 1fr));
  gap: 16px;
  margin: 0;
  padding: 20px 0 0;
  list-style: none;
  border-top: 1px solid var(--hair);
}

.page-about .stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
}

.page-about .stat__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1.1;
  letter-spacing: .02em;
  color: var(--mint);
}

.page-about .stat__label {
  font-size: 12.5px;
  line-height: 1.55;
  color: var(--ink-mute);
}

.page-about .media {
  position: relative;
  margin: 0;
}

.page-about .media__caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .03em;
  color: var(--ink-mute);
}

.page-about .about-open__media img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  clip-path: polygon(0 3%, 96% 0, 100% 96%, 5% 100%);
}

/* 发展节点 */
.page-about .about-axis {
  display: grid;
  gap: 24px;
  margin: 38px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-axis__item {
  position: relative;
  padding: 0 0 6px 26px;
  border-left: 1px solid var(--hair-strong);
}

.page-about .about-axis__node {
  position: absolute;
  left: -5px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--mint);
  box-shadow: 0 0 0 4px var(--ink);
}

.page-about .about-axis__node--live {
  background: var(--amber);
  animation: about-pulse 2.8s ease-in-out infinite;
}

@keyframes about-pulse {
  0%, 100% { box-shadow: 0 0 0 4px var(--ink); }
  50% { box-shadow: 0 0 0 9px rgba(255, 182, 72, .16), 0 0 0 4px var(--ink); }
}

.page-about .about-axis__label {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .14em;
  color: var(--mint);
}

.page-about .about-axis__title {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .02em;
  color: var(--paper);
}

.page-about .about-axis__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--ink-soft);
}

/* 四步流程：暖纸章节 */
.page-about .about-flow {
  background: var(--paper);
  color: var(--about-paper-soft);
}

.page-about .about-flow .kicker {
  color: var(--teal);
}

.page-about .about-flow .section__title {
  color: var(--about-paper-ink);
}

.page-about .about-flow .section__lead {
  color: var(--about-paper-soft);
}

.page-about .about-flow__grid {
  display: grid;
  gap: 26px;
}

.page-about .about-flow__media img {
  display: block;
  width: 100%;
  aspect-ratio: 4 / 3;
  object-fit: cover;
  border-radius: var(--r-md);
}

.page-about .about-flow .media__caption {
  color: rgba(8, 16, 14, .56);
}

.page-about .about-steps {
  display: grid;
  gap: 14px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-step {
  padding: 18px 18px 20px;
  background: rgba(255, 255, 255, .6);
  border: 1px solid var(--about-paper-line);
  border-radius: var(--r-lg);
}

.page-about .about-step__num {
  display: block;
  margin-bottom: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--teal);
}

.page-about .about-step__title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--about-paper-ink);
}

.page-about .about-step__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--about-paper-soft);
}

/* 团队区块 + 标签页 */
.page-about .about-band {
  position: relative;
  overflow: hidden;
  margin-bottom: 32px;
  background: var(--pitch);
  border: 1px solid var(--hair-strong);
  border-radius: var(--r-xl);
}

.page-about .about-band__img {
  display: block;
  width: 100%;
  aspect-ratio: 3 / 2;
  object-fit: cover;
}

.page-about .about-band__text {
  padding: 20px 18px 24px;
}

.page-about .about-band__lead {
  margin: 0;
  max-width: 48em;
  font-size: 15px;
  color: var(--ink-soft);
}

.page-about .about-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-bottom: 18px;
}

.page-about .about-tabs .tabs__btn {
  padding: 10px 20px;
  font-family: var(--font-body);
  font-size: 14px;
  font-weight: 600;
  letter-spacing: .02em;
  color: var(--ink-soft);
  background: transparent;
  border: 1px solid var(--hair-strong);
  border-radius: var(--r-pill);
  cursor: pointer;
  transition: background .2s ease, color .2s ease, border-color .2s ease;
}

.page-about .about-tabs .tabs__btn:hover {
  border-color: var(--mint);
  color: var(--paper);
}

.page-about .about-tabs .tabs__btn[aria-selected="true"] {
  background: var(--mint);
  border-color: var(--mint);
  color: var(--ink);
}

.page-about .about-tabs .tabs__btn:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .about-panel {
  padding: 22px 18px 26px;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--r-xl);
  color: var(--about-paper-soft);
}

.page-about .about-panel:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 4px;
}

.page-about .about-panel p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
}

.page-about .about-panel h3 {
  color: var(--about-paper-ink);
}

.page-about .about-roles {
  display: grid;
  gap: 16px;
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-role {
  padding-top: 14px;
  border-top: 1px solid var(--about-paper-line);
}

.page-about .about-role__name {
  margin: 0 0 6px;
  font-size: 16px;
  font-weight: 700;
  letter-spacing: .03em;
}

.page-about .about-role p {
  margin: 0;
  font-size: 14px;
}

.page-about .about-versions {
  display: grid;
  gap: 16px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-version {
  padding-left: 14px;
  border-left: 2px solid var(--teal);
}

.page-about .about-version__id {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: .05em;
  color: var(--teal);
}

.page-about .about-version h3 {
  margin: 0 0 4px;
  font-size: 15px;
  letter-spacing: .02em;
}

.page-about .about-version p {
  margin: 0;
  font-size: 14px;
}

.page-about .about-scope {
  display: grid;
  gap: 12px;
  margin: 0 0 18px;
  padding: 0;
  list-style: none;
}

.page-about .about-scope li {
  display: grid;
  grid-template-columns: 74px minmax(0, 1fr);
  gap: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--about-paper-line);
  font-size: 14px;
  line-height: 1.7;
}

.page-about .about-scope__num {
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--teal);
}

.page-about .about-note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  line-height: 1.7;
  letter-spacing: .02em;
  color: rgba(8, 16, 14, .58);
}

/* 目录式跳转 */
.page-about .about-next {
  padding-bottom: 62px;
}

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

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

.page-about .about-next__link {
  display: grid;
  grid-template-columns: minmax(0, 1fr) auto;
  align-items: center;
  gap: 4px 16px;
  padding: 18px 20px;
  text-decoration: none;
  background: var(--pitch);
  border: 1px solid var(--hair-strong);
  border-radius: var(--r-lg);
  transition: border-color .2s ease, background .2s ease, transform .2s ease;
}

.page-about .about-next__link:hover,
.page-about .about-next__link:focus-visible {
  border-color: var(--mint);
  background: #14302a;
}

.page-about .about-next__link:focus-visible {
  outline: 2px solid var(--amber);
  outline-offset: 3px;
}

.page-about .about-next__name {
  font-size: 17px;
  font-weight: 700;
  letter-spacing: .03em;
  color: var(--paper);
}

.page-about .about-next__note {
  grid-column: 1;
  font-size: 13px;
  line-height: 1.6;
  color: var(--ink-mute);
}

.page-about .about-next__arrow {
  grid-area: 1 / 2 / 3 / 3;
  font-family: var(--font-mono);
  font-size: 18px;
  color: var(--mint);
}

/* 平板与桌面 */
@media (min-width: 620px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 720px) {
  .page-about .section {
    padding: 70px 0;
  }

  .page-about .about-band__img {
    aspect-ratio: 14 / 9;
    opacity: .38;
  }

  .page-about .about-band__text {
    position: absolute;
    inset: 0;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
    padding: 34px;
    background: linear-gradient(180deg, rgba(8, 16, 14, .12), rgba(8, 16, 14, .92));
  }

  .page-about .about-panel {
    padding: 34px 32px 36px;
  }

  .page-about .about-roles {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }

  .page-about .about-version {
    display: grid;
    grid-template-columns: 104px minmax(0, 1fr);
    gap: 16px;
    align-items: start;
  }

  .page-about .about-version__id {
    margin-bottom: 0;
  }

  .page-about .about-next__list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 14px;
  }
}

@media (min-width: 900px) {
  .page-about .about-open__grid {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 52px;
    align-items: start;
  }

  .page-about .about-axis {
    position: relative;
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 0;
    margin-top: 52px;
  }

  .page-about .about-axis::before {
    content: "";
    position: absolute;
    left: 0;
    right: 0;
    top: 26px;
    height: 1px;
    background: linear-gradient(90deg, var(--mint), rgba(216, 207, 192, .16));
  }

  .page-about .about-axis__item {
    padding: 46px 26px 0 0;
    border-left: 0;
  }

  .page-about .about-axis__node {
    top: 22px;
    left: 0;
  }

  .page-about .about-flow__grid {
    grid-template-columns: minmax(0, .72fr) minmax(0, 1.28fr);
    gap: 40px;
    align-items: start;
  }
}

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

  .page-about .about-next__link {
    transition: none;
  }

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