.page-about {
  --about-rail: 200px;
  --about-gap: clamp(32px, 5vw, 76px);
  --about-ink: #C2E4E0;
  --about-ink-strong: #EFFBF9;
  --about-mist: #8FF2E5;
}

/* ---------- 面包屑 ---------- */
.page-about .crumbs {
  padding-top: clamp(16px, 2.6vw, 26px);
}
.page-about .crumbs__inner {
  display: flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: 0.08em;
  color: var(--muted);
}
.page-about .crumbs__inner a {
  color: var(--mist);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--ease), border-color var(--ease);
}
.page-about .crumbs__inner a:hover,
.page-about .crumbs__inner a:focus-visible {
  color: var(--cyan);
  border-bottom-color: var(--cyan);
}
.page-about .crumbs__sep {
  color: var(--muted);
  opacity: 0.6;
}
.page-about .crumbs__now {
  color: var(--fg-strong);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  padding: clamp(34px, 5.5vw, 78px) 0 clamp(44px, 6vw, 92px);
}
.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: -30% 12% 32% -18%;
  background: radial-gradient(circle at 34% 44%, rgba(47, 230, 200, 0.13), transparent 64%);
  pointer-events: none;
}
.page-about .about-hero__grid {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 44px);
}
.page-about .about-hero__copy .idx {
  color: var(--about-mist);
}
.page-about .about-hero h1 {
  margin: 14px 0 0;
  font-size: var(--fs-display);
  font-weight: 300;
  line-height: 1.02;
  letter-spacing: 0.02em;
  color: var(--fg-strong);
  font-stretch: condensed;
}
.page-about .about-hero .lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: var(--fs-body);
  line-height: 1.8;
  color: var(--about-ink);
}
.page-about .about-hero__btns {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}
.page-about .about-hero__figure {
  margin: 0;
  border: 2px solid var(--edge);
  overflow: hidden;
  background: var(--console);
}
.page-about .about-hero__figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: 5fr 7fr;
    align-items: end;
    gap: clamp(32px, 4vw, 56px);
  }
  .page-about .about-hero__copy {
    padding-bottom: 64px;
  }
  .page-about .about-hero__figure {
    margin-top: 64px;
  }
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  padding: clamp(36px, 5vw, 84px) 0 clamp(28px, 4vw, 56px);
}
.page-about .about-body__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 30px;
}

.page-about .about-index .idx {
  margin-bottom: 12px;
  color: var(--muted);
}
.page-about .about-index nav {
  display: flex;
  gap: 8px;
  overflow-x: auto;
  padding-bottom: 6px;
  scrollbar-width: none;
}
.page-about .about-index nav::-webkit-scrollbar {
  display: none;
}
.page-about .about-index a {
  flex: 0 0 auto;
  padding: 8px 13px;
  font-size: 13px;
  white-space: nowrap;
  color: var(--muted);
  text-decoration: none;
  border: 1px solid var(--edge-soft);
  transition: color var(--ease), border-color var(--ease), background var(--ease);
}
.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--cyan);
  border-color: var(--cyan);
  background: rgba(47, 230, 200, 0.06);
}

@media (min-width: 1040px) {
  .page-about .about-body__grid {
    grid-template-columns: minmax(0, var(--about-rail)) minmax(0, 1fr);
    gap: var(--about-gap);
    align-items: start;
  }
  .page-about .about-index {
    position: sticky;
    top: 104px;
  }
  .page-about .about-index .idx {
    padding-left: 16px;
  }
  .page-about .about-index nav {
    flex-direction: column;
    gap: 0;
    overflow: visible;
    padding-bottom: 0;
  }
  .page-about .about-index a {
    border: 0;
    border-left: 2px solid var(--edge-soft);
    padding: 11px 0 11px 14px;
    white-space: normal;
    line-height: 1.5;
  }
  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    background: transparent;
    border-left-color: var(--cyan);
  }
}

.page-about .about-flow {
  display: grid;
  gap: clamp(26px, 3.6vw, 48px);
  min-width: 0;
}

/* ---------- 章节卡 ---------- */
.page-about .chap {
  position: relative;
  padding: clamp(24px, 3.4vw, 50px) clamp(18px, 3vw, 46px);
  border: 2px solid var(--edge-soft);
  box-shadow: var(--shadow-hard);
  scroll-margin-top: 100px;
  min-width: 0;
}
.page-about .chap--dark {
  color: var(--about-ink);
}
.page-about .chap--dark h2,
.page-about .chap--dark h3 {
  color: var(--about-ink-strong);
}
.page-about .chap--dark .idx {
  color: var(--about-mist);
}
.page-about .chap--indigo {
  background: var(--indigo);
  background-image: linear-gradient(150deg, rgba(47, 230, 200, 0.12), transparent 58%);
}
.page-about .chap--console {
  background: var(--console);
  background-image: linear-gradient(200deg, rgba(255, 107, 74, 0.09), transparent 52%);
}
.page-about .chap--teal {
  background: var(--teal);
  background-image: linear-gradient(160deg, rgba(143, 242, 229, 0.12), transparent 62%);
}
.page-about .chap--wine {
  background: var(--wine);
  background-image: linear-gradient(140deg, rgba(255, 107, 74, 0.16), transparent 56%);
}
.page-about .chap--lift {
  background: var(--surface);
  color: var(--fg);
}
.page-about .chap--lift h2,
.page-about .chap--lift h3 {
  color: var(--fg-strong);
}

.page-about .chap__head {
  margin-bottom: clamp(18px, 2.6vw, 32px);
  padding-bottom: 14px;
  border-bottom: 1px solid var(--edge-soft);
}
.page-about .chap__head h2 {
  margin: 10px 0 0;
  font-size: var(--fs-h2);
  font-weight: 400;
  line-height: 1.16;
  letter-spacing: 0.015em;
}
.page-about .chap p {
  font-size: var(--fs-body);
  line-height: 1.78;
  max-width: 62ch;
}
.page-about .chap p + p {
  margin-top: 1.05em;
}
.page-about .chap h3 {
  font-size: var(--fs-h3);
  font-weight: 400;
  line-height: 1.4;
}

/* ---------- 引文 ---------- */
.page-about .pullquote {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 4px 0 4px clamp(18px, 2.6vw, 32px);
  border-left: 2px solid var(--cyan);
  max-width: 42ch;
}
.page-about .pullquote::before {
  content: "\201C";
  display: block;
  font-family: Georgia, "Times New Roman", serif;
  font-size: clamp(2.8rem, 5.6vw, 4.4rem);
  line-height: 0.72;
  color: rgba(47, 230, 200, 0.35);
  margin-bottom: 6px;
}
.page-about .pullquote p {
  font-size: clamp(1.1rem, 1.8vw, 1.4rem);
  line-height: 1.62;
  color: var(--about-ink-strong);
  max-width: none;
}

/* ---------- 折叠细读 ---------- */
.page-about .fold {
  margin-top: clamp(22px, 3vw, 32px);
  border: 1px solid var(--edge);
  background: transparent;
}
.page-about .fold summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 14px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  color: var(--about-mist);
  transition: color var(--ease), background var(--ease);
}
.page-about .fold summary::-webkit-details-marker {
  display: none;
}
.page-about .fold summary:hover {
  color: var(--cyan);
  background: rgba(47, 230, 200, 0.05);
}
.page-about .fold summary::after {
  content: "+";
  flex: 0 0 auto;
  font-size: 20px;
  line-height: 1;
  color: var(--cyan);
  transition: transform var(--ease);
}
.page-about .fold[open] summary::after {
  transform: rotate(45deg);
}
.page-about .fold__body {
  padding: 2px 18px 20px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--about-ink);
}
.page-about .fold__body p {
  font-size: 16px;
  max-width: 60ch;
}

/* ---------- 三条做法 ---------- */
.page-about .rule-list {
  list-style: none;
  margin: 0;
  padding: 0;
}
.page-about .rule {
  display: grid;
  gap: 10px;
  padding: clamp(18px, 2.6vw, 28px) 0;
  border-top: 1px solid var(--edge-soft);
}
.page-about .rule:first-child {
  border-top: 0;
  padding-top: 0;
}
.page-about .rule__num {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral);
}
.page-about .rule h3 {
  margin: 0;
}
.page-about .rule p {
  margin: 0;
}

/* ---------- 版本层叠卡片 ---------- */
.page-about .ver-rail {
  display: flex;
  gap: 16px;
  overflow-x: auto;
  padding: 4px 2px 20px;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}
.page-about .ver-rail::-webkit-scrollbar {
  height: 6px;
}
.page-about .ver-rail::-webkit-scrollbar-track {
  background: rgba(143, 242, 229, 0.1);
}
.page-about .ver-rail::-webkit-scrollbar-thumb {
  background: rgba(47, 230, 200, 0.4);
}
.page-about .ver-card {
  flex: 0 0 min(78vw, 296px);
  scroll-snap-align: start;
  padding: 20px 20px 24px;
  border: 2px solid var(--edge);
  background: rgba(6, 23, 38, 0.55);
  box-shadow: var(--shadow-soft);
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}
.page-about .ver-card:hover,
.page-about .ver-card:focus-within {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
}
.page-about .ver-card__ver {
  font-size: clamp(1.6rem, 3vw, 2.2rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.04em;
  color: var(--cyan);
  max-width: none;
}
.page-about .ver-card h3 {
  margin: 14px 0 10px;
  font-size: 1.1rem;
}
.page-about .ver-card p:last-child {
  font-size: 15.5px;
  line-height: 1.72;
  color: var(--about-ink);
  max-width: none;
}

/* ---------- 配图 ---------- */
.page-about .about-figure {
  margin: clamp(22px, 3vw, 34px) 0 0;
  border: 2px solid var(--edge);
  overflow: hidden;
  background: var(--surface);
}
.page-about .about-figure img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}
.page-about .about-figure figcaption {
  padding: 10px 14px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--muted);
  border-top: 1px solid var(--edge-soft);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-top: clamp(24px, 3vw, 34px);
}
.page-about .team {
  padding: clamp(18px, 2.4vw, 28px);
  border: 2px solid var(--edge-soft);
  background: rgba(47, 230, 200, 0.05);
  transition: border-color var(--ease), transform var(--ease);
}
.page-about .team:hover {
  border-color: var(--cyan);
  transform: translateY(-3px);
}
.page-about .team .idx {
  color: var(--muted);
}
.page-about .team__size {
  margin: 10px 0 0;
  font-size: clamp(2.2rem, 4.6vw, 3.2rem);
  font-weight: 300;
  line-height: 1;
  letter-spacing: 0.01em;
  color: var(--cyan);
  max-width: none;
}
.page-about .team__size span {
  font-size: 0.4em;
  letter-spacing: 0.16em;
  color: var(--muted);
}
.page-about .team h3 {
  margin: 14px 0 10px;
  font-size: 1.08rem;
}
.page-about .team p:last-child {
  font-size: 16px;
  line-height: 1.74;
  max-width: 46ch;
}

@media (min-width: 760px) {
  .page-about .team-grid {
    grid-template-columns: repeat(12, minmax(0, 1fr));
  }
  .page-about .team--a {
    grid-column: span 7;
  }
  .page-about .team--b {
    grid-column: span 5;
  }
  .page-about .team--c {
    grid-column: span 12;
  }
}

/* ---------- 节奏表 ---------- */
.page-about .cadence {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid rgba(143, 242, 229, 0.22);
}
.page-about .cadence__row {
  display: grid;
  gap: 6px;
  padding: 16px 0;
  border-bottom: 1px solid rgba(143, 242, 229, 0.22);
}
.page-about .cadence__k {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--coral);
}
.page-about .cadence__v {
  font-size: 16px;
  line-height: 1.72;
  color: var(--about-ink);
}
.page-about .cadence__note {
  margin-top: clamp(20px, 2.8vw, 30px);
}
.page-about .chap--wine .cadence__k {
  color: var(--cyan);
}

@media (min-width: 680px) {
  .page-about .cadence__row {
    grid-template-columns: minmax(0, 152px) minmax(0, 1fr);
    gap: 24px;
    align-items: baseline;
  }
}

/* ---------- 章节内 CTA ---------- */
.page-about .about-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(24px, 3vw, 34px);
}

/* ---------- 结尾导流 ---------- */
.page-about .about-next {
  padding: clamp(38px, 5.5vw, 78px) 0 clamp(56px, 8vw, 108px);
  border-top: 1px solid var(--edge-soft);
}
.page-about .about-next__title {
  font-size: var(--fs-h2);
  font-weight: 300;
  line-height: 1.18;
  letter-spacing: 0.015em;
  color: var(--fg-strong);
}
.page-about .next-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-top: clamp(22px, 3vw, 34px);
}
.page-about .next-card {
  display: block;
  padding: 22px 20px;
  text-decoration: none;
  color: inherit;
  background: var(--surface);
  border: 2px solid var(--edge-soft);
  box-shadow: var(--shadow-soft);
  transition: transform var(--ease), box-shadow var(--ease), border-color var(--ease);
}
.page-about .next-card .idx {
  display: block;
  margin-bottom: 12px;
  color: var(--muted);
}
.page-about .next-card strong {
  display: block;
  font-size: 16px;
  font-weight: 400;
  line-height: 1.6;
  color: var(--fg-strong);
}
.page-about .next-card:hover,
.page-about .next-card:focus-visible {
  transform: translateY(-4px);
  border-color: var(--cyan);
  box-shadow: var(--shadow-hard);
}
.page-about .next-card:hover .idx,
.page-about .next-card:focus-visible .idx {
  color: var(--cyan);
}

@media (min-width: 720px) {
  .page-about .next-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1140px) {
  .page-about .next-grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* ---------- 动效退化 ---------- */
@media (prefers-reduced-motion: reduce) {
  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.001ms !important;
    animation-duration: 0.001ms !important;
  }
  .page-about .ver-card:hover,
  .page-about .team:hover,
  .page-about .next-card:hover {
    transform: none;
  }
}