.page-about {
  position: relative;
  padding-bottom: 72px;
  overflow-x: clip;
}

/* ---------- 面包屑 ---------- */
.page-about__crumbs {
  padding-top: 22px;
  font-size: 13px;
  color: var(--ky-mist);
  letter-spacing: 0.04em;
}
.page-about__crumbs a {
  color: var(--ky-mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color 220ms var(--ky-ease), border-color 220ms var(--ky-ease);
}
.page-about__crumbs a:hover,
.page-about__crumbs a:focus-visible {
  color: var(--ky-cyan);
  border-bottom-color: var(--ky-cyan);
}
.page-about__crumbs .ky-crumbs__sep {
  margin: 0 10px;
  color: rgba(143, 169, 163, 0.55);
}

/* ---------- 首屏 ---------- */
.page-about__hero {
  position: relative;
  padding: 34px 0 52px;
}
.page-about__hero::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: -10px;
  height: 340px;
  background-image:
    linear-gradient(to right, rgba(47, 240, 206, 0.07) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 240, 206, 0.07) 1px, transparent 1px);
  background-size: 72px 72px;
  -webkit-mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 88%);
  mask-image: linear-gradient(to bottom, rgba(0, 0, 0, 0.85), transparent 88%);
  pointer-events: none;
  z-index: 0;
}
.page-about__hero > * {
  position: relative;
  z-index: 1;
}

.page-about__kicker {
  margin: 0 0 20px;
  color: var(--ky-cyan);
  letter-spacing: 0.26em;
  font-size: 12px;
}

.page-about__title {
  margin: 0 0 22px;
  max-width: 20ch;
  font-size: clamp(30px, 6.4vw, 58px);
  font-weight: 300;
  line-height: 1.14;
  letter-spacing: -0.02em;
  color: var(--ky-white);
}

.page-about__lede {
  margin: 0 0 40px;
  max-width: 44ch;
  font-size: clamp(15px, 1.5vw, 17px);
  line-height: 1.8;
  color: var(--ky-mist);
}

.page-about__facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: rgba(242, 251, 248, 0.07);
  border: 1px solid rgba(242, 251, 248, 0.07);
  border-radius: var(--ky-radius);
  overflow: hidden;
}
.page-about__fact {
  background: var(--ky-ink);
  padding: 16px 18px;
}
.page-about__fact dt {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--ky-mist);
}
.page-about__fact dd {
  margin: 0;
  font-size: clamp(20px, 4vw, 26px);
  line-height: 1;
  color: var(--ky-white);
  letter-spacing: 0.04em;
}
.page-about__fact:last-child dd {
  color: var(--ky-cyan);
}

/* ---------- 主体两栏 ---------- */
.page-about__body {
  display: block;
  padding-top: 6px;
}

/* ---------- 索引轴（移动端为横向胶囊） ---------- */
.page-about__rail {
  position: relative;
  margin: 0 0 34px;
  padding: 16px 0;
  border-top: 1px solid rgba(242, 251, 248, 0.07);
  border-bottom: 1px solid rgba(242, 251, 248, 0.07);
}
.page-about__rail-title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--ky-mist);
}
.page-about__rail-list {
  display: flex;
  gap: 10px;
  margin: 0;
  padding: 0;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
  -webkit-overflow-scrolling: touch;
}
.page-about__rail-list li {
  flex: 0 0 auto;
}
.page-about__rail-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 14px;
  border: 1px solid rgba(242, 251, 248, 0.09);
  border-radius: var(--ky-radius);
  color: var(--ky-mist);
  font-size: 13px;
  white-space: nowrap;
  text-decoration: none;
  transition: color 220ms var(--ky-ease), border-color 220ms var(--ky-ease), background 220ms var(--ky-ease);
}
.page-about__rail-link:hover,
.page-about__rail-link:focus-visible {
  color: var(--ky-cyan);
  border-color: var(--ky-cyan);
}
.page-about__rail-link[aria-current="true"] {
  color: var(--ky-ink);
  background: var(--ky-cyan);
  border-color: var(--ky-cyan);
}
.page-about__rail-num {
  font-size: 11px;
  opacity: 0.75;
}

/* ---------- 章节通用 ---------- */
.page-about__section {
  position: relative;
  padding: 44px 0 52px;
}
.page-about__section--grid::before {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  top: 0;
  height: 100%;
  background-image:
    linear-gradient(to right, rgba(47, 240, 206, 0.05) 1px, transparent 1px),
    linear-gradient(to bottom, rgba(47, 240, 206, 0.05) 1px, transparent 1px);
  background-size: 48px 48px;
  -webkit-mask-image: radial-gradient(ellipse at 20% 0%, rgba(0, 0, 0, 0.8), transparent 72%);
  mask-image: radial-gradient(ellipse at 20% 0%, rgba(0, 0, 0, 0.8), transparent 72%);
  pointer-events: none;
  z-index: 0;
}
.page-about__section--grid > * {
  position: relative;
  z-index: 1;
}

.page-about__sec-head {
  margin-bottom: 26px;
}
.page-about__section .ky-index {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ky-cyan);
}
.page-about__section .ky-h2 {
  margin: 12px 0 0;
  font-size: clamp(23px, 4.2vw, 36px);
  font-weight: 500;
  line-height: 1.2;
  color: var(--ky-white);
}
.page-about__sec-lede {
  margin: 14px 0 0;
  max-width: 50ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--ky-mist);
}

/* ---------- 图片 ---------- */
.page-about__figure {
  margin: 0 0 32px;
}
.page-about__figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  object-fit: cover;
  border-radius: var(--ky-radius);
}
.page-about__figure--square img {
  aspect-ratio: 1 / 1;
}
.page-about__figure .ky-figure__caption {
  color: var(--ky-mist);
  font-size: 12px;
  letter-spacing: 0.06em;
}

/* ---------- 时间轴 ---------- */
.page-about__timeline {
  position: relative;
  margin: 0;
  padding: 4px 0 0 26px;
  list-style: none;
}
.page-about__timeline::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  bottom: 12px;
  width: 1px;
  background: linear-gradient(to bottom, var(--ky-cyan) 0%, rgba(47, 240, 206, 0.35) 40%, rgba(143, 169, 163, 0.22) 100%);
}
.page-about__node {
  position: relative;
  padding: 0 0 34px;
}
.page-about__node:last-child {
  padding-bottom: 4px;
}
.page-about__node::before {
  content: "";
  position: absolute;
  left: -31px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ky-mist);
  box-shadow: 0 0 0 3px var(--ky-ink);
  transition: transform 300ms var(--ky-ease), background 300ms var(--ky-ease);
}
.page-about__node--now::before {
  background: var(--ky-cyan);
  box-shadow: 0 0 0 3px var(--ky-ink), 0 0 0 7px rgba(47, 240, 206, 0.16);
}
.page-about__node-year {
  display: inline-block;
  margin: 0 0 10px;
  padding: 3px 10px;
  border: 1px solid rgba(255, 162, 58, 0.35);
  border-radius: var(--ky-radius);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ky-amber);
  background: rgba(255, 162, 58, 0.06);
}
.page-about__node--now .page-about__node-year {
  color: var(--ky-cyan);
  border-color: rgba(47, 240, 206, 0.5);
  background: rgba(47, 240, 206, 0.08);
}
.page-about__node-title {
  margin: 0 0 8px;
  font-size: 19px;
  font-weight: 500;
  color: var(--ky-white);
}
.page-about__node-copy {
  margin: 0;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ky-mist);
}

/* ---------- 版本对照表 ---------- */
.page-about__tablewrap {
  overflow-x: auto;
  border: 1px solid rgba(242, 251, 248, 0.08);
  border-radius: var(--ky-radius);
  background: rgba(12, 42, 36, 0.55);
  -webkit-overflow-scrolling: touch;
}
.page-about__table {
  width: 100%;
  min-width: 620px;
  border-collapse: collapse;
  font-size: 14px;
}
.page-about__table-caption {
  padding: 14px 16px 10px;
  text-align: left;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--ky-mist);
}
.page-about__table th,
.page-about__table td {
  padding: 14px 16px;
  text-align: left;
  border-bottom: 1px solid rgba(242, 251, 248, 0.07);
  color: var(--ky-white);
  white-space: nowrap;
}
.page-about__table thead th {
  font-size: 11px;
  font-weight: 500;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--ky-mist);
  background: rgba(3, 12, 10, 0.5);
}
.page-about__table tbody th[scope="row"] {
  font-size: 13px;
  color: var(--ky-cyan);
  letter-spacing: 0.08em;
}
.page-about__table tbody td:nth-child(2),
.page-about__table tbody td:nth-child(3),
.page-about__table tbody td:nth-child(4) {
  text-align: right;
  font-family: var(--ky-font-mono);
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
  color: var(--ky-cyan-soft);
}
.page-about__table tbody tr:last-child th,
.page-about__table tbody tr:last-child td {
  border-bottom: 0;
}
.page-about__row--now {
  background: linear-gradient(90deg, rgba(47, 240, 206, 0.1), transparent 72%);
}
.page-about__row--now th[scope="row"] {
  color: var(--ky-cyan);
}
.page-about__table-note {
  margin: 14px 0 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--ky-mist);
}

/* ---------- 团队 ---------- */
.page-about__team-bar {
  display: flex;
  height: 6px;
  margin: 0 0 12px;
  border-radius: 3px;
  overflow: hidden;
  background: rgba(242, 251, 248, 0.06);
}
.page-about__team-bar-seg {
  display: block;
  height: 100%;
}
.page-about__team-bar-seg--edit {
  flex: 18;
  background: var(--ky-cyan);
}
.page-about__team-bar-seg--data {
  flex: 15;
  background: var(--ky-cyan-soft);
}
.page-about__team-bar-seg--care {
  flex: 9;
  background: var(--ky-amber);
}
.page-about__team-bar-note {
  margin: 0 0 28px;
  font-size: 13px;
  color: var(--ky-mist);
}
.page-about__team-bar-note .ky-mono {
  color: var(--ky-white);
  letter-spacing: 0.06em;
}

.page-about__teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: 0 0 34px;
  background: rgba(242, 251, 248, 0.08);
  border: 1px solid rgba(242, 251, 248, 0.08);
  border-radius: var(--ky-radius);
  overflow: hidden;
}
.page-about__team {
  padding: 24px 22px;
  background: var(--ky-panel);
  transition: background 280ms var(--ky-ease);
}
.page-about__team:hover {
  background: #103630;
}
.page-about__team-num {
  display: block;
  margin: 0 0 10px;
  font-size: 38px;
  line-height: 1;
  color: var(--ky-cyan);
  letter-spacing: -0.01em;
}
.page-about__team-name {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 500;
  color: var(--ky-white);
}
.page-about__team-copy {
  margin: 0;
  font-size: 14px;
  line-height: 1.78;
  color: var(--ky-mist);
}

/* ---------- 编辑标准 ---------- */
.page-about__steps {
  margin: 0;
  padding: 0;
  list-style: none;
  counter-reset: ky-step;
}
.page-about__step {
  position: relative;
  counter-increment: ky-step;
  padding: 20px 0 20px 54px;
  border-top: 1px solid rgba(242, 251, 248, 0.07);
}
.page-about__step:last-child {
  border-bottom: 1px solid rgba(242, 251, 248, 0.07);
}
.page-about__step::before {
  content: "0" counter(ky-step);
  position: absolute;
  left: 0;
  top: 22px;
  font-family: var(--ky-font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--ky-cyan);
}
.page-about__step::after {
  content: "";
  position: absolute;
  left: 34px;
  top: 26px;
  width: 12px;
  height: 1px;
  background: rgba(47, 240, 206, 0.45);
}
.page-about__step-title {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 500;
  color: var(--ky-white);
}
.page-about__step-copy {
  margin: 0;
  max-width: 48ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ky-mist);
}
.page-about__step:last-child .page-about__step-title {
  color: var(--ky-cyan-soft);
}

/* ---------- 使用规模 ---------- */
.page-about__stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 0 0 30px;
  background: rgba(242, 251, 248, 0.08);
  border: 1px solid rgba(242, 251, 248, 0.08);
  border-radius: var(--ky-radius);
  overflow: hidden;
}
.page-about__stat {
  padding: 22px 20px;
  background: var(--ky-ink);
}
.page-about__stat dt {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--ky-mist);
}
.page-about__stat dd {
  margin: 0 0 12px;
  display: flex;
  align-items: baseline;
  gap: 4px;
  color: var(--ky-white);
}
.page-about__stat-num {
  font-size: clamp(26px, 5vw, 34px);
  line-height: 1;
  letter-spacing: 0.02em;
}
.page-about__stat-unit {
  font-size: 13px;
  color: var(--ky-cyan);
  letter-spacing: 0.06em;
}
.page-about__stat-note {
  margin: 0;
  font-size: 13px;
  line-height: 1.72;
  color: var(--ky-mist);
}
.page-about__stat:nth-child(2) .page-about__stat-num {
  color: var(--ky-orange);
}
.page-about__stat:nth-child(2) .page-about__stat-unit {
  color: var(--ky-orange);
}

.page-about__scale-tail {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ky-mist);
}
.page-about__scale-tail a {
  color: var(--ky-cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(47, 240, 206, 0.4);
  transition: border-color 220ms var(--ky-ease), color 220ms var(--ky-ease);
}
.page-about__scale-tail a:hover,
.page-about__scale-tail a:focus-visible {
  color: var(--ky-cyan-soft);
  border-bottom-color: var(--ky-cyan-soft);
}

/* ---------- 收尾 ---------- */
.page-about__outro {
  position: relative;
  margin-top: 8px;
  padding: 32px 24px 34px;
  border: 1px solid rgba(47, 240, 206, 0.24);
  border-radius: var(--ky-radius);
  background:
    linear-gradient(135deg, rgba(47, 240, 206, 0.09) 0%, rgba(12, 42, 36, 0.6) 46%, rgba(3, 12, 10, 0.8) 100%);
  overflow: hidden;
}
.page-about__outro::after {
  content: "";
  position: absolute;
  right: -60px;
  top: -60px;
  width: 190px;
  height: 190px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(47, 240, 206, 0.22), transparent 68%);
  pointer-events: none;
}
.page-about__outro-kicker {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--ky-cyan);
}
.page-about__outro-title {
  margin: 12px 0 12px;
  font-size: clamp(20px, 3.4vw, 28px);
  font-weight: 500;
  line-height: 1.25;
  color: var(--ky-white);
}
.page-about__outro-copy {
  margin: 0 0 24px;
  max-width: 46ch;
  font-size: 15px;
  line-height: 1.78;
  color: var(--ky-mist);
  position: relative;
  z-index: 1;
}
.page-about__outro-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  position: relative;
  z-index: 1;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about__teams {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
  .page-about__stats {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about__hero {
    padding: 48px 0 64px;
  }
}

@media (min-width: 1024px) {
  .page-about {
    padding-bottom: 96px;
  }
  .page-about__hero {
    padding: 56px 0 72px;
  }
  .page-about__lede {
    max-width: 48ch;
  }
  .page-about__body {
    display: grid;
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 60px;
    padding-top: 28px;
    align-items: start;
  }

  .page-about__rail {
    position: sticky;
    top: 28px;
    align-self: start;
    margin: 0;
    padding: 0 0 0 22px;
    border: 0;
    max-height: calc(100vh - 56px);
    overflow-y: auto;
    scrollbar-width: none;
  }
  .page-about__rail::-webkit-scrollbar {
    display: none;
  }
  .page-about__rail::before {
    content: "";
    position: absolute;
    left: 0;
    top: 30px;
    bottom: 12px;
    width: 1px;
    background: linear-gradient(to bottom, var(--ky-cyan) 0%, rgba(47, 240, 206, 0.22) 46%, rgba(143, 169, 163, 0.16) 100%);
  }
  .page-about__rail-title {
    margin: 0 0 18px;
  }
  .page-about__rail-list {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
  }
  .page-about__rail-link {
    position: relative;
    padding: 11px 0 11px 2px;
    border: 0;
    border-radius: 0;
    background: transparent;
    font-size: 14px;
  }
  .page-about__rail-link::before {
    content: "";
    position: absolute;
    left: -22px;
    top: 50%;
    width: 7px;
    height: 7px;
    margin-top: -3.5px;
    border-radius: 50%;
    background: var(--ky-mist);
    opacity: 0.55;
    transition: transform 260ms var(--ky-ease), background 260ms var(--ky-ease), box-shadow 260ms var(--ky-ease), opacity 260ms var(--ky-ease);
  }
  .page-about__rail-link:hover::before,
  .page-about__rail-link:focus-visible::before {
    background: var(--ky-cyan-soft);
    opacity: 1;
  }
  .page-about__rail-link:hover,
  .page-about__rail-link:focus-visible {
    border-color: transparent;
    color: var(--ky-cyan-soft);
  }
  .page-about__rail-link[aria-current="true"] {
    background: transparent;
    border-color: transparent;
    color: var(--ky-cyan);
  }
  .page-about__rail-link[aria-current="true"]::before {
    background: var(--ky-cyan);
    opacity: 1;
    transform: scale(1.5);
    box-shadow: 0 0 0 4px rgba(47, 240, 206, 0.14);
  }

  .page-about__section {
    padding: 12px 0 64px;
  }
  .page-about__section:first-child {
    padding-top: 0;
  }
  .page-about__sec-head {
    margin-bottom: 32px;
  }
  .page-about__figure {
    margin-bottom: 40px;
  }
  .page-about__timeline {
    padding-left: 34px;
  }
  .page-about__node::before {
    left: -39px;
  }
  .page-about__node {
    padding-bottom: 42px;
  }
  .page-about__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
  .page-about__stat {
    padding: 26px 22px;
  }
  .page-about__outro {
    padding: 44px 42px 46px;
  }
  .page-about__table {
    min-width: 100%;
  }
}

@media (min-width: 1280px) {
  .page-about__body {
    grid-template-columns: 224px minmax(0, 1fr);
    gap: 72px;
  }
  .page-about__figure {
    margin-left: 0;
    max-width: 880px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about * {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }
}
</PAGE_CSS>