.page-about {
  --about-index-w: 196px;
  --about-line: rgba(140, 135, 168, .38);
  --about-grid: rgba(55, 224, 216, .06);
  position: relative;
}

.page-about .about-crumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: 18px 0 46px;
  background:
    linear-gradient(180deg, rgba(55, 224, 216, .07), rgba(10, 20, 40, 0) 62%),
    linear-gradient(0deg, var(--ink-900), var(--ink-900));
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    repeating-linear-gradient(90deg, var(--about-grid) 0 1px, transparent 1px 64px),
    repeating-linear-gradient(0deg, var(--about-grid) 0 1px, transparent 1px 64px);
  pointer-events: none;
}

.page-about .about-hero__inner {
  position: relative;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 30px;
}

.page-about .about-hero__text .eyebrow {
  color: var(--orange-400);
  letter-spacing: .16em;
}

.page-about .about-hero__text .h1 {
  margin: 12px 0 16px;
  letter-spacing: -.01em;
}

.page-about .about-hero__text .lede {
  max-width: 46ch;
  color: var(--paper-100);
}

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

.page-about .about-hero__panel {
  position: relative;
  padding: 22px 20px 18px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-top: 3px solid var(--cyan-400);
  box-shadow: var(--shadow-lift);
}

.page-about .about-hero__panel::after {
  content: "";
  position: absolute;
  right: -8px;
  bottom: -8px;
  width: 64px;
  height: 64px;
  border-right: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
  pointer-events: none;
}

.page-about .about-hero__panel-head {
  margin: 0 0 16px;
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--slate-500);
}

.page-about .about-hero__stats {
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px 12px;
}

.page-about .about-hero__stats .stat__num {
  color: var(--cyan-400);
}

.page-about .about-hero__note {
  margin: 18px 0 0;
  padding-top: 14px;
  border-top: 1px solid var(--ink-700);
  font-size: .8125rem;
  color: var(--slate-500);
}

/* ---------- 主体双栏 ---------- */
.page-about .about-layout {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 32px;
  padding-top: 40px;
  padding-bottom: 8px;
}

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

.page-about .about-index__head {
  margin: 0 0 14px;
  font-size: .75rem;
  letter-spacing: .18em;
  color: var(--slate-500);
}

.page-about .about-index__list {
  list-style: none;
  margin: 0;
  padding: 0 0 0 16px;
  position: relative;
}

.page-about .about-index__list::before {
  content: "";
  position: absolute;
  left: 0;
  top: 6px;
  bottom: 6px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan-400), var(--purple-400) 55%, rgba(140, 135, 168, 0));
}

.page-about .about-index__link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 7px 0;
  border-bottom: 1px solid rgba(27, 46, 78, .7);
  font-size: .875rem;
  color: var(--paper-100);
  text-decoration: none;
  transition: color var(--dur-micro) var(--ease), padding-left var(--dur-micro) var(--ease);
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--cyan-400);
  padding-left: 4px;
}

.page-about .about-index__num {
  font-size: .75rem;
  color: var(--purple-400);
}

.page-about .about-index__foot {
  margin: 16px 0 0;
  font-size: .75rem;
  letter-spacing: .12em;
  color: var(--slate-500);
}

/* ---------- 章节 ---------- */
.page-about .about-chapter {
  scroll-margin-top: calc(var(--topbar-h) + 24px);
  padding-bottom: 46px;
  margin-bottom: 46px;
  border-bottom: 1px solid var(--ink-700);
}

.page-about .about-chapter:last-child {
  border-bottom: 0;
  margin-bottom: 0;
  padding-bottom: 20px;
}

.page-about .about-chapter .section-head {
  margin-bottom: 18px;
}

.page-about .about-chapter .eyebrow {
  color: var(--purple-400);
  letter-spacing: .16em;
  font-size: .75rem;
}

.page-about .about-chapter .h2 {
  margin-top: 10px;
}

.page-about .about-chapter__text {
  max-width: 68ch;
  color: var(--paper-100);
}

.page-about .about-chapter__text--end {
  margin-top: 24px;
  padding-top: 18px;
  border-top: 1px dashed var(--about-line);
  font-size: .9375rem;
  color: var(--slate-500);
}

/* 收录范围 */
.page-about .about-scope {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--ink-700);
  border: 1px solid var(--ink-700);
}

.page-about .about-scope__item {
  background: var(--ink-800);
  padding: 18px 18px 16px;
  transition: background var(--dur-micro) var(--ease), box-shadow var(--dur-micro) var(--ease);
}

.page-about .about-scope__item:hover,
.page-about .about-scope__item:focus-within {
  background: var(--ink-700);
  box-shadow: inset 3px 0 0 var(--cyan-400);
}

.page-about .about-scope__title {
  margin: 0 0 8px;
  color: var(--cyan-400);
}

.page-about .about-scope__desc {
  margin: 0;
  font-size: .875rem;
  color: var(--paper-100);
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 18px 20px;
  margin-top: 30px;
  padding-top: 24px;
  border-top: 1px solid var(--ink-700);
}

.page-about .about-figures__num {
  display: block;
  font-size: 1.35rem;
  font-weight: 500;
  color: var(--orange-400);
  letter-spacing: -.01em;
}

.page-about .about-figures__label {
  display: block;
  margin-top: 6px;
  font-size: .8125rem;
  color: var(--slate-500);
}

/* 图片 */
.page-about .about-shot {
  margin: 0 0 26px;
}

.page-about .about-shot img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border: 1px solid var(--ink-700);
  background: var(--ink-800);
}

.page-about .about-shot--wide img {
  aspect-ratio: 12 / 7;
}

.page-about .about-shot--square img {
  aspect-ratio: 10 / 7;
}

.page-about .about-shot--band img {
  aspect-ratio: 5 / 2;
}

.page-about .about-shot__caption {
  margin-top: 10px;
  font-size: .8125rem;
  color: var(--slate-500);
  border-left: 2px solid var(--purple-400);
  padding-left: 10px;
}

/* 流程步骤 */
.page-about .about-steps {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  counter-reset: about-step;
}

.page-about .about-steps__item {
  position: relative;
  padding: 18px 18px 16px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  border-top: 3px solid var(--cyan-600);
  transition: transform var(--dur-enter) var(--ease), border-color var(--dur-enter) var(--ease);
}

.page-about .about-steps__item:hover,
.page-about .about-steps__item:focus-within {
  transform: translateY(-3px);
  border-color: var(--cyan-400);
}

.page-about .about-steps__no {
  display: block;
  font-size: 1.5rem;
  color: var(--purple-400);
  letter-spacing: .04em;
}

.page-about .about-steps__title {
  margin: 10px 0 8px;
  color: var(--paper-50);
}

.page-about .about-steps__desc {
  margin: 0;
  font-size: .875rem;
  color: var(--paper-100);
}

/* 团队岗位 */
.page-about .about-roles {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-role {
  position: relative;
  padding: 18px 18px 16px;
  background: var(--ink-800);
  border: 1px solid var(--ink-700);
  outline: none;
  transition: transform var(--dur-enter) var(--ease), border-color var(--dur-enter) var(--ease), background var(--dur-enter) var(--ease);
}

.page-about .about-role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 3px;
  height: 100%;
  background: var(--ink-700);
  transition: background var(--dur-enter) var(--ease);
}

.page-about .about-role:hover,
.page-about .about-role:focus-visible {
  transform: translateY(-3px);
  border-color: var(--cyan-400);
  background: var(--ink-700);
}

.page-about .about-role:hover::before,
.page-about .about-role:focus-visible::before {
  background: var(--orange-400);
}

.page-about .about-role__tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: .75rem;
  color: var(--ink-900);
  background: var(--purple-400);
}

.page-about .about-role__title {
  margin: 12px 0 8px;
  color: var(--paper-50);
}

.page-about .about-role__desc {
  margin: 0;
  font-size: .875rem;
  color: var(--paper-100);
}

/* 时间线 */
.page-about .about-tl {
  list-style: none;
  margin: 28px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-tl__item {
  position: relative;
  padding: 0 0 0 24px;
  outline: none;
}

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 16px;
  bottom: -24px;
  width: 1px;
  background: linear-gradient(180deg, var(--purple-400), rgba(140, 135, 168, .05));
}

.page-about .about-tl__item:last-child::before {
  display: none;
}

.page-about .about-tl__node {
  position: absolute;
  left: 0;
  top: 3px;
  width: 11px;
  height: 11px;
  background: var(--ink-900);
  border: 1.5px solid var(--purple-400);
  transition: background var(--dur-micro) var(--ease), border-color var(--dur-micro) var(--ease), transform var(--dur-micro) var(--ease);
}

.page-about .about-tl__item--current .about-tl__node {
  background: var(--orange-400);
  border-color: var(--orange-400);
}

.page-about .about-tl__item:hover .about-tl__node,
.page-about .about-tl__item:focus-within .about-tl__node {
  border-color: var(--cyan-400);
  background: var(--cyan-400);
  transform: scale(1.18);
}

.page-about .about-tl__code {
  margin: 0 0 6px;
  font-size: .8125rem;
  letter-spacing: .1em;
  color: var(--cyan-400);
}

.page-about .about-tl__item--current .about-tl__code {
  color: var(--orange-400);
}

.page-about .about-tl__title {
  margin: 0 0 8px;
  color: var(--paper-50);
}

.page-about .about-tl__note {
  margin: 0;
  font-size: .875rem;
  color: var(--paper-100);
}

.page-about .about-tl__item:hover .about-tl__note,
.page-about .about-tl__item:focus-within .about-tl__note {
  color: var(--paper-50);
}

/* 协作供稿 */
.page-about .about-partners {
  margin-top: 24px;
}

.page-about .about-partners__item h3 {
  margin: 0 0 10px;
  color: var(--cyan-400);
}

.page-about .about-partners__item p {
  margin: 0;
  font-size: .875rem;
  color: var(--paper-100);
}

/* 典型使用者 */
.page-about .about-chapter--light {
  padding: 26px 20px 30px;
  background: var(--paper-50);
  border: 1px solid var(--paper-100);
  border-bottom: 1px solid var(--paper-100);
  color: var(--ink-900);
}

.page-about .about-chapter--light .eyebrow {
  color: var(--orange-600);
}

.page-about .about-chapter--light .h2 {
  color: var(--ink-900);
}

.page-about .about-chapter--light .about-chapter__text {
  color: #24344d;
}

.page-about .about-chapter--light .text-link {
  color: var(--cyan-700);
}

.page-about .about-users {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
  margin-top: 22px;
}

.page-about .about-user {
  padding: 18px 18px 16px;
  background: #fff;
  border: 1px solid var(--paper-100);
  border-left: 3px solid var(--purple-400);
  transition: transform var(--dur-enter) var(--ease), border-color var(--dur-enter) var(--ease), box-shadow var(--dur-enter) var(--ease);
}

.page-about .about-user:hover {
  transform: translateY(-3px);
  border-left-color: var(--orange-400);
  box-shadow: 0 10px 24px rgba(10, 20, 40, .12);
}

.page-about .about-user__no {
  display: inline-block;
  margin: 0 0 10px;
  padding: 1px 7px;
  font-size: .75rem;
  color: var(--paper-50);
  background: var(--ink-800);
}

.page-about .about-user h3 {
  margin: 0 0 8px;
  color: var(--ink-900);
}

.page-about .about-user p {
  margin: 0;
  font-size: .875rem;
  color: #33445c;
  line-height: 1.75;
}

/* ---------- 结尾行动区 ---------- */
.page-about .about-cta {
  margin-top: 40px;
  padding: 42px 0 56px;
  background:
    linear-gradient(135deg, rgba(55, 224, 216, .12), rgba(255, 154, 60, .1) 70%, rgba(10, 20, 40, 0)),
    var(--ink-800);
  border-top: 1px solid var(--ink-700);
}

.page-about .about-cta__inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 24px;
  align-items: center;
}

.page-about .about-cta .eyebrow {
  color: var(--cyan-400);
  letter-spacing: .16em;
  font-size: .75rem;
}

.page-about .about-cta__text .h2 {
  margin: 10px 0 10px;
}

.page-about .about-cta__text p {
  margin: 0;
  max-width: 52ch;
  color: var(--paper-100);
  font-size: .9375rem;
}

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

/* ---------- 响应式 ---------- */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 26px 0 58px;
  }

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

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

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

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

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

  .page-about .about-tl {
    grid-template-columns: repeat(5, minmax(0, 1fr));
    gap: 16px;
  }

  .page-about .about-tl__item {
    padding: 26px 16px 0 0;
  }

  .page-about .about-tl__item::before {
    left: 0;
    right: 0;
    top: 5px;
    bottom: auto;
    width: auto;
    height: 1px;
    background: linear-gradient(90deg, var(--purple-400), rgba(140, 135, 168, .06));
  }

  .page-about .about-tl__node {
    top: 0;
    left: 0;
  }

  .page-about .about-chapter--light {
    padding: 30px 28px 34px;
  }

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

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 1.2fr) minmax(0, .8fr);
    gap: 32px;
  }

  .page-about .about-cta__actions {
    justify-content: flex-end;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.12fr) minmax(0, .88fr);
    gap: 48px;
    align-items: start;
  }

  .page-about .about-layout {
    grid-template-columns: var(--about-index-w) minmax(0, 1fr);
    gap: 48px;
    padding-top: 52px;
  }

  .page-about .about-index {
    display: block;
    position: sticky;
    top: calc(var(--topbar-h) + 28px);
    align-self: start;
  }

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

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

  .page-about .about-shot--wide {
    margin-bottom: 32px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-role,
  .page-about .about-steps__item,
  .page-about .about-user,
  .page-about .about-tl__node,
  .page-about .about-index__link {
    transition: none;
  }

  .page-about .about-role:hover,
  .page-about .about-steps__item:hover,
  .page-about .about-user:hover {
    transform: none;
  }
}