.page-about {
  --about-hair: 1px solid rgba(215, 222, 232, .26);
  --about-hair-soft: 1px solid rgba(215, 222, 232, .16);
  --about-ease: cubic-bezier(.22, .61, .36, 1);
  --about-paper-edge: 6px 6px 0 rgba(215, 222, 232, .5), var(--shadow-panel);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  overflow: hidden;
  background: var(--ink);
  color: var(--paper);
  padding: 40px 0 56px;
}

.page-about .about-hero-panel {
  position: absolute;
  top: -22%;
  right: -18%;
  width: 78%;
  aspect-ratio: 1 / 1;
  background:
    radial-gradient(circle at 34% 32%, rgba(22, 194, 200, .26), transparent 62%),
    linear-gradient(142deg, rgba(255, 107, 44, .18), transparent 58%);
  transform: rotate(14deg);
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: -8%;
  right: -8%;
  bottom: -2px;
  height: 38%;
  background: linear-gradient(180deg, rgba(22, 194, 200, .14), rgba(10, 26, 47, 0) 78%);
  transform: skewY(-4.5deg);
  transform-origin: right bottom;
  pointer-events: none;
}

.page-about .about-hero-inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 34px;
}

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

.page-about .breadcrumb ol {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 0;
  margin: 0 0 20px;
  padding: 0;
  list-style: none;
}

.page-about .breadcrumb li {
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
  color: rgba(215, 222, 232, .72);
}

.page-about .breadcrumb li + li::before {
  content: "/";
  margin: 0 9px;
  color: rgba(215, 222, 232, .36);
}

.page-about .breadcrumb a {
  color: rgba(215, 222, 232, .72);
  text-decoration: none;
  transition: color .24s var(--about-ease);
}

.page-about .breadcrumb a:hover,
.page-about .breadcrumb a:focus-visible {
  color: var(--paper);
}

.page-about .breadcrumb li[aria-current="page"] {
  color: var(--paper);
}

.page-about .about-hero-title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 200;
  font-size: clamp(38px, 8.6vw, 84px);
  line-height: 1.02;
  letter-spacing: .012em;
  color: var(--paper);
}

.page-about .about-hero-lede {
  max-width: 40ch;
  margin: 22px 0 0;
  font-size: 16.5px;
  line-height: 1.85;
  color: rgba(239, 243, 248, .84);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 28px;
}

.page-about .about-hero-side {
  min-width: 0;
}

.page-about .about-hero-plate {
  border-top: var(--about-hair);
  padding-top: 18px;
}

.page-about .about-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: 14px 0 0;
  background: rgba(215, 222, 232, .2);
  border: 1px solid rgba(215, 222, 232, .2);
}

.page-about .about-figures > div {
  background: var(--ink);
  padding: 14px 15px 16px;
}

.page-about .about-figures dt {
  font-family: var(--font-mono);
  font-size: 10.5px;
  letter-spacing: .16em;
  text-transform: uppercase;
  color: rgba(215, 222, 232, .66);
}

.page-about .about-figures dd {
  margin: 8px 0 0;
  font-family: var(--font-mono);
  font-size: clamp(17px, 2.6vw, 23px);
  letter-spacing: .02em;
  color: var(--paper);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-body {
  display: grid;
  gap: 6px;
  padding: 40px 0 72px;
}

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

.page-about .about-index {
  display: flex;
  flex-wrap: nowrap;
  gap: 6px;
  margin: 0 0 10px;
  padding: 0 0 12px;
  overflow-x: auto;
  border-bottom: var(--line);
  scrollbar-width: none;
}

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

.page-about .about-index a {
  flex: 0 0 auto;
  white-space: nowrap;
  padding: 6px 12px;
  border: var(--line);
  border-radius: 999px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .1em;
  color: var(--muted);
  text-decoration: none;
  transition: color .24s var(--about-ease), background-color .24s var(--about-ease), border-color .24s var(--about-ease);
}

.page-about .about-index a:hover,
.page-about .about-index a:focus-visible {
  color: var(--text);
  border-color: var(--ink);
}

.page-about .about-index a.is-active {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  position: relative;
  padding: 34px 0 44px;
  border-top: var(--line);
  scroll-margin-top: 92px;
}

.page-about .about-section--next {
  border-bottom: var(--line);
}

.page-about .about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  margin-bottom: 18px;
}

.page-about .about-tabmark {
  flex: 0 0 auto;
  margin-top: 4px;
  padding: 4px 8px 3px;
  border-radius: 2px;
  background: var(--signal);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .14em;
}

.page-about .about-section-head .index-label {
  margin: 0;
}

.page-about .about-section-head .section-title {
  margin: 6px 0 0;
  font-family: var(--font-display);
  font-weight: 300;
  font-size: clamp(24px, 4.6vw, 38px);
  line-height: 1.18;
  letter-spacing: .01em;
  color: var(--text);
}

.page-about .about-prose {
  max-width: 38em;
}

.page-about .about-prose p {
  margin: 0 0 16px;
  font-size: 16.5px;
  line-height: 1.85;
  color: var(--text);
}

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

.page-about .about-lede {
  max-width: 38em;
  margin: 22px 0 0;
  font-size: 16px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 01 主线要点 ---------- */
.page-about .about-points {
  display: grid;
  gap: 12px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-point {
  position: relative;
  padding: 18px 18px 20px 58px;
  background: var(--paper);
  border: var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
  transition: transform .28s var(--about-ease), box-shadow .28s var(--about-ease);
}

.page-about .about-point:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-panel);
}

.page-about .about-point-num {
  position: absolute;
  left: 16px;
  top: 19px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--cyan-ink);
}

.page-about .about-point-title {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.5;
  color: var(--text);
}

.page-about .about-point p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 02 时间轴 ---------- */
.page-about .about-figure {
  margin: 0 0 26px;
}

.page-about .figure-frame {
  position: relative;
  overflow: hidden;
  background: var(--silver);
  border: var(--line);
  border-radius: var(--radius);
}

.page-about .figure-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .figure-caption {
  margin-top: 10px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .06em;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .about-timeline {
  display: flex;
  gap: 18px;
  margin: 24px -4px 0;
  padding: 6px 4px 22px;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-timeline::-webkit-scrollbar {
  height: 5px;
}

.page-about .about-timeline::-webkit-scrollbar-track {
  background: var(--silver);
}

.page-about .about-timeline::-webkit-scrollbar-thumb {
  background: var(--mist);
}

.page-about .about-node {
  flex: 0 0 min(76vw, 258px);
  scroll-snap-align: start;
  background: var(--paper);
  border: var(--line);
  border-radius: var(--radius);
  box-shadow: var(--about-paper-edge);
  transition: transform .28s var(--about-ease), border-color .28s var(--about-ease);
}

.page-about .about-node:hover {
  transform: translateY(-3px);
}

.page-about .about-node .step-card-head {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 10px;
  padding: 13px 15px;
  border-bottom: var(--line);
  cursor: pointer;
}

.page-about .about-node .step-card-head:focus-visible {
  outline: 2px solid var(--signal);
  outline-offset: -2px;
}

.page-about .about-node .step-num {
  padding: 3px 7px 2px;
  border-radius: 2px;
  background: var(--ink);
  color: var(--paper);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
}

.page-about .about-node .step-title {
  font-size: 14.5px;
  font-weight: 600;
  line-height: 1.45;
  color: var(--text);
}

.page-about .about-node .step-caret {
  width: 8px;
  height: 8px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg) translate(-2px, -2px);
  transition: transform .28s var(--about-ease), border-color .28s var(--about-ease);
}

.page-about .about-node .step-body {
  padding: 14px 15px 18px;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  transition: background-color .28s var(--about-ease), color .28s var(--about-ease);
}

.page-about .about-node .step-body p {
  margin: 0;
}

.page-about .about-node.is-open {
  border-color: var(--signal);
}

.page-about .about-node.is-open .step-num {
  background: var(--signal);
}

.page-about .about-node.is-open .step-body {
  background: rgba(255, 107, 44, .06);
  color: var(--text);
}

.page-about .about-node.is-open .step-caret {
  border-color: var(--signal);
  transform: rotate(225deg) translate(-2px, -2px);
}

/* ---------- 03 团队 ---------- */
.page-about .about-team-grid {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-team {
  position: relative;
  padding: 22px 18px 22px;
  background: var(--paper);
  border: var(--line);
  border-top: 3px solid var(--cyan);
  border-radius: var(--radius);
  transition: transform .28s var(--about-ease), box-shadow .28s var(--about-ease);
}

.page-about .about-team:hover,
.page-about .about-team:focus-visible {
  transform: translateY(-4px);
  box-shadow: var(--shadow-panel);
  outline: none;
}

.page-about .about-team:focus-visible {
  outline: 2px solid var(--ink);
  outline-offset: 2px;
}

.page-about .about-team--signal {
  border-top-color: var(--signal);
}

.page-about .about-team--amber {
  border-top-color: var(--amber);
}

.page-about .about-team-num {
  display: inline-block;
  margin-bottom: 12px;
  font-family: var(--font-mono);
  font-size: 11.5px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .about-team-name {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 400;
  font-size: clamp(19px, 3vw, 23px);
  letter-spacing: .02em;
  color: var(--text);
}

.page-about .about-team-desc {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-team-more {
  margin: 12px 0 0;
  padding-top: 12px;
  border-top: var(--line);
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
  opacity: .72;
  transition: opacity .28s var(--about-ease), color .28s var(--about-ease);
}

.page-about .about-team:hover .about-team-more,
.page-about .about-team:focus-visible .about-team-more {
  opacity: 1;
  color: var(--text);
}

@media (hover: none) {
  .page-about .about-team-more {
    opacity: 1;
    color: var(--text);
  }
}

/* ---------- 04 伙伴网络 ---------- */
.page-about .about-network-grid {
  display: grid;
  gap: 24px;
  margin-top: 22px;
}

.page-about .about-figure--flush {
  margin: 0;
}

/* ---------- 05 季度复盘 ---------- */
.page-about .about-review {
  margin-top: 28px;
}

.page-about .about-review .tablist {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  padding-bottom: 14px;
  border-bottom: var(--line);
}

.page-about .about-review .tab {
  padding: 7px 14px;
  border: var(--line);
  border-radius: 999px;
  background: transparent;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .1em;
  color: var(--muted);
  cursor: pointer;
  transition: color .24s var(--about-ease), background-color .24s var(--about-ease), border-color .24s var(--about-ease);
}

.page-about .about-review .tab:hover {
  color: var(--text);
  border-color: var(--ink);
}

.page-about .about-review .tab[aria-selected="true"] {
  background: var(--ink);
  border-color: var(--ink);
  color: var(--paper);
}

.page-about .about-review .tab-panel {
  padding-top: 22px;
}

.page-about .about-review-grid {
  display: grid;
  gap: 12px;
  grid-template-columns: repeat(auto-fit, minmax(158px, 1fr));
}

.page-about .about-metric {
  padding: 16px 16px 18px;
  background: var(--paper);
  border: var(--line);
  border-left: 3px solid var(--cyan);
  border-radius: var(--radius);
}

.page-about .about-metric-k {
  display: block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: .14em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-metric-v {
  display: block;
  margin-top: 10px;
  font-family: var(--font-mono);
  font-weight: 500;
  font-size: clamp(26px, 3.6vw, 34px);
  line-height: 1;
  letter-spacing: .02em;
  color: var(--ink);
}

.page-about .about-metric-u {
  display: block;
  margin-top: 8px;
  font-size: 12.5px;
  letter-spacing: .04em;
  color: var(--muted);
}

.page-about .about-review-note {
  max-width: 44em;
  margin: 18px 0 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 06 下一版本 ---------- */
.page-about .about-next-list {
  display: grid;
  gap: 0;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
  border-top: var(--line);
}

.page-about .about-next-item {
  display: grid;
  grid-template-columns: 42px minmax(0, 1fr);
  gap: 12px;
  padding: 20px 0;
  border-bottom: var(--line);
}

.page-about .about-next-idx {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--signal);
  padding-top: 3px;
}

.page-about .about-next-item h3 {
  margin: 0 0 8px;
  font-size: 16.5px;
  font-weight: 600;
  line-height: 1.55;
  color: var(--text);
}

.page-about .about-next-item p {
  margin: 0;
  max-width: 42em;
  font-size: 15.5px;
  line-height: 1.82;
  color: var(--muted);
}

.page-about .about-close {
  margin-top: 30px;
  padding: 24px 20px 26px;
  background: var(--ink-2);
  border-radius: var(--radius);
  border-left: 3px solid var(--signal);
}

.page-about .about-close-text {
  max-width: 46em;
  margin: 0;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(239, 243, 248, .86);
}

.page-about .about-close-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

.page-about .about-close-actions .btn-quiet {
  color: rgba(239, 243, 248, .82);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-points {
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
  }

  .page-about .about-team-grid {
    grid-template-columns: repeat(auto-fit, minmax(230px, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 52px 0 76px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: end;
    gap: 56px;
  }

  .page-about .about-hero-side {
    padding-bottom: 6px;
  }

  .page-about .about-network-grid {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
    align-items: start;
    gap: 34px;
  }

  .page-about .about-figure--flush {
    margin-top: 6px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-body {
    grid-template-columns: 208px minmax(0, 1fr);
    gap: 0 56px;
    padding: 52px 0 88px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
  }

  .page-about .about-index {
    flex-direction: column;
    flex-wrap: nowrap;
    gap: 0;
    margin: 0;
    padding: 0;
    overflow: visible;
    border-bottom: none;
    border-left: var(--line);
  }

  .page-about .about-index a {
    display: block;
    width: 100%;
    padding: 11px 0 11px 16px;
    margin-left: -1px;
    border: none;
    border-left: 2px solid transparent;
    border-radius: 0;
    font-size: 12px;
    letter-spacing: .1em;
    color: var(--muted);
    text-align: left;
    transition: color .24s var(--about-ease), border-color .24s var(--about-ease), background-color .24s var(--about-ease);
  }

  .page-about .about-index a:hover,
  .page-about .about-index a:focus-visible {
    background: rgba(22, 194, 200, .07);
    border-color: var(--mist);
    color: var(--text);
  }

  .page-about .about-index a.is-active {
    background: rgba(255, 107, 44, .08);
    border-left-color: var(--signal);
    color: var(--signal);
  }

  .page-about .about-section {
    padding: 44px 0 56px;
  }

  .page-about .about-node {
    flex: 0 0 268px;
  }

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

@media (min-width: 1240px) {
  .page-about .about-body {
    grid-template-columns: 232px minmax(0, 1fr);
    gap: 0 72px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-point,
  .page-about .about-team,
  .page-about .about-node,
  .page-about .about-team-more,
  .page-about .about-node .step-caret,
  .page-about .breadcrumb a {
    transition: none;
  }

  .page-about .about-point:hover,
  .page-about .about-team:hover,
  .page-about .about-team:focus-visible,
  .page-about .about-node:hover {
    transform: none;
  }
}