.page-about {
  --about-rail-w: 216px;
  --about-rule: rgba(138, 148, 166, .26);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: 26px 0 58px;
}

.page-about .about-hero__grid {
  display: grid;
  gap: 36px;
  align-items: center;
  margin-top: 26px;
}

.page-about .about-hero__kicker {
  margin: 0 0 16px;
  font-size: .74rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--neon);
}

.page-about .about-hero h1 {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.3rem, 8vw, 4.4rem);
  line-height: .98;
  letter-spacing: -.02em;
  color: var(--cool);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 54ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--graphite);
}

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

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

.page-about .about-hero__media .media__frame {
  border: 1px solid var(--line-strong);
}

.page-about .about-hero__stats {
  list-style: none;
  margin: 46px 0 0;
  padding: 26px 0 0;
  border-top: 1px solid var(--about-rule);
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 16px;
}

.page-about .about-hero__stats li {
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .about-hero__num {
  font-size: clamp(1.7rem, 3vw, 2.3rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--neon);
}

.page-about .about-hero__unit {
  font-size: .84rem;
  color: var(--graphite);
}

/* ---------- 分屏长文骨架 ---------- */

.page-about .about-body {
  padding-bottom: 76px;
}

.page-about .about-layout {
  display: grid;
  gap: 40px;
}

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

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

/* 左栏刻度尺 */

.page-about .about-scale {
  border-left: 1px solid var(--line-strong);
  padding-left: 20px;
}

.page-about .about-scale__cap {
  display: block;
  margin: 0 0 16px;
  font-size: .68rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-scale__item {
  position: relative;
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 0;
  font-size: .92rem;
  color: var(--graphite);
  text-decoration: none;
  transition: color .18s ease;
}

.page-about .about-scale__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 13px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--void);
  border: 1.5px solid var(--line-strong);
  transition: background .18s ease, border-color .18s ease, box-shadow .18s ease;
}

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

.page-about .about-scale__item:hover::before,
.page-about .about-scale__item:focus-visible::before {
  background: var(--neon);
  border-color: var(--neon);
  box-shadow: 0 0 0 4px rgba(51, 225, 214, .14);
}

.page-about .about-scale__idx {
  font-size: .7rem;
  letter-spacing: .06em;
  color: var(--amber);
}

/* ---------- 通用内容块 ---------- */

.page-about .about-block {
  padding-bottom: 52px;
  margin-bottom: 52px;
  border-bottom: 1px solid var(--about-rule);
}

.page-about .about-block:last-child {
  padding-bottom: 0;
  margin-bottom: 0;
  border-bottom: 0;
}

.page-about .about-block__num {
  margin: 0 0 12px;
  font-size: .72rem;
  letter-spacing: .18em;
  text-transform: uppercase;
  color: var(--amber);
}

.page-about .about-block__title {
  margin: 0 0 24px;
  max-width: 20ch;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.55rem, 4.4vw, 2.4rem);
  line-height: 1.14;
  letter-spacing: -.015em;
  color: var(--cool);
}

.page-about .about-block .prose {
  max-width: 66ch;
  font-size: 1rem;
  line-height: 1.85;
  color: var(--graphite);
}

.page-about .about-block .prose p {
  margin: 0 0 1.15em;
}

.page-about .about-block .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-block .prose a {
  color: var(--neon);
  text-decoration: underline;
  text-underline-offset: 3px;
}

/* ---------- 引文块 ---------- */

.page-about .about-quote {
  position: relative;
  margin: 32px 0;
  padding: 26px 30px 26px 36px;
  background: var(--paper);
  border: 1px solid var(--ink);
  box-shadow: var(--paper-shadow);
}

.page-about .about-quote::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 6px;
  background: var(--flare);
}

.page-about .about-quote p {
  margin: 0;
  font-size: 1.05rem;
  line-height: 1.8;
  color: var(--ink);
  font-weight: 600;
}

/* ---------- 配图 ---------- */

.page-about .about-figure {
  margin: 30px 0 34px;
}

.page-about .about-figure .media__frame {
  border: 1px solid var(--line-strong);
}

/* ---------- 数据面板块 ---------- */

.page-about .about-panel {
  margin: 30px 0;
  padding: 22px 26px;
  background: var(--stand);
  border: 1px solid var(--about-rule);
  border-left: 3px solid var(--neon);
}

.page-about .about-panel__label {
  margin: 0 0 8px;
  font-size: .7rem;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--graphite);
}

.page-about .about-panel__value {
  margin: 0 0 8px;
  font-size: clamp(1.9rem, 5vw, 2.6rem);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--neon);
}

.page-about .about-panel__value span {
  font-size: .9rem;
  font-weight: 400;
  color: var(--cool);
}

.page-about .about-panel__note {
  margin: 0;
  font-size: .9rem;
  line-height: 1.7;
  color: var(--graphite);
}

/* ---------- 团队配比 ---------- */

.page-about .about-roster {
  position: relative;
  margin: 28px 0 32px;
  padding: 24px 22px;
  background: var(--stand);
  border: 1px solid var(--about-rule);
}

.page-about .about-roster__head {
  display: flex;
  align-items: baseline;
  gap: 10px;
  margin-bottom: 18px;
}

.page-about .about-roster__total {
  font-size: 2.4rem;
  font-weight: 700;
  line-height: 1;
  letter-spacing: -.02em;
  color: var(--cool);
}

.page-about .about-roster__cap {
  font-size: .88rem;
  color: var(--graphite);
}

.page-about .about-roster__bar {
  display: flex;
  height: 54px;
  border: 1px solid var(--line-strong);
}

.page-about .about-roster__seg {
  position: relative;
  display: flex;
  align-items: center;
  justify-content: center;
  min-width: 0;
  font-family: var(--font-mono);
  font-size: .95rem;
  font-weight: 700;
  color: var(--void);
  cursor: default;
}

.page-about .about-roster__seg--check {
  flex: 18;
  background: var(--neon);
}

.page-about .about-roster__seg--rest {
  flex: 28;
  background: var(--amber);
  border-left: 1px solid var(--void);
}

.page-about .about-roster__tip {
  position: absolute;
  left: 50%;
  bottom: calc(100% + 10px);
  transform: translateX(-50%) translateY(4px);
  width: max-content;
  max-width: 210px;
  padding: 8px 12px;
  background: var(--void);
  color: var(--cool);
  border: 1px solid var(--line-strong);
  font-family: var(--font-body);
  font-size: .76rem;
  font-weight: 400;
  line-height: 1.5;
  text-align: center;
  opacity: 0;
  pointer-events: none;
  transition: opacity .18s ease, transform .18s ease;
}

.page-about .about-roster__seg:hover .about-roster__tip,
.page-about .about-roster__seg:focus-within .about-roster__tip {
  opacity: 1;
  transform: translateX(-50%) translateY(0);
}

.page-about .about-roster__legend {
  list-style: none;
  margin: 18px 0 0;
  padding: 0;
  display: grid;
  gap: 9px;
  font-size: .85rem;
  color: var(--graphite);
}

.page-about .about-roster__legend li {
  display: flex;
  align-items: center;
  gap: 9px;
}

.page-about .about-roster__key {
  flex: none;
  width: 12px;
  height: 12px;
}

.page-about .about-roster__key--check {
  background: var(--neon);
}

.page-about .about-roster__key--rest {
  background: var(--amber);
}

/* ---------- 版本演进 ---------- */

.page-about .about-versions {
  display: grid;
  gap: 14px;
  margin: 28px 0 30px;
}

.page-about .about-versions .fold {
  position: relative;
  padding: 16px 20px 6px;
  background: var(--stand);
  border: 1px solid var(--about-rule);
}

.page-about .about-versions .fold__summary {
  display: flex;
  align-items: baseline;
  gap: 10px;
  flex-wrap: wrap;
}

.page-about .about-v__tag {
  display: inline-block;
  padding: 2px 8px;
  font-size: .74rem;
  font-weight: 700;
  color: var(--void);
  background: var(--neon);
  letter-spacing: .04em;
}

.page-about .about-v__tag--amber {
  background: var(--amber);
}

.page-about .about-v__tag--flare {
  background: var(--flare);
  color: var(--paper);
}

.page-about .about-v__name {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 1.05rem;
  letter-spacing: -.01em;
  color: var(--cool);
}

.page-about .about-versions .fold__body p {
  margin: 12px 0 0;
  font-size: .92rem;
  line-height: 1.8;
  color: var(--graphite);
  max-width: 42ch;
}

/* ---------- 收束 CTA ---------- */

.page-about .about-cta {
  margin-top: 30px;
  padding: 26px 24px;
  background: linear-gradient(160deg, var(--stand) 0%, rgba(21, 35, 64, .35) 100%);
  border: 1px solid var(--about-rule);
  border-top: 3px solid var(--flare);
}

.page-about .about-cta__text {
  margin: 0 0 20px;
  max-width: 52ch;
  font-size: .98rem;
  line-height: 1.8;
  color: var(--graphite);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 32px 0 72px;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    gap: 56px;
    margin-top: 34px;
  }

  .page-about .about-hero__media {
    width: calc(100% + 78px);
    max-width: none;
  }

  .page-about .about-hero__stats {
    margin-top: 56px;
    padding-top: 30px;
    gap: 26px 20px;
  }
}

@media (min-width: 960px) {
  .page-about .about-layout {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: 68px;
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: calc(var(--bar-h) + 32px);
  }

  .page-about .about-block {
    padding-bottom: 62px;
    margin-bottom: 62px;
  }

  .page-about .about-block__title {
    margin-bottom: 28px;
  }
}

@media (min-width: 800px) {
  .page-about .about-versions {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 0;
    margin: 32px 0 34px;
    padding-top: 26px;
    border-top: 2px solid var(--line-strong);
  }

  .page-about .about-versions .fold {
    padding: 10px 24px 4px;
    background: transparent;
    border: 0;
    border-left: 1px solid var(--about-rule);
  }

  .page-about .about-versions .fold:first-child {
    padding-left: 0;
    border-left: 0;
  }

  .page-about .about-versions .fold::before {
    content: "";
    position: absolute;
    top: -33px;
    left: 24px;
    width: 11px;
    height: 11px;
    border-radius: 50%;
    background: var(--void);
    border: 2px solid var(--neon);
  }

  .page-about .about-versions .fold:first-child::before {
    left: 0;
  }
}

@media (min-width: 1100px) {
  .page-about .about-hero__media {
    width: calc(100% + 110px);
  }

  .page-about .about-block {
    padding-bottom: 72px;
    margin-bottom: 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-scale__item,
  .page-about .about-scale__item::before,
  .page-about .about-roster__seg,
  .page-about .about-roster__tip {
    transition: none;
  }
}