.page-about {
  --about-gap: clamp(30px, 4.6vw, 60px);
  --about-pad: clamp(22px, 3.4vw, 40px);
  padding-bottom: clamp(56px, 8vw, 104px);
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(30px, 5vw, 56px);
  padding: clamp(20px, 3vw, 34px) 0 clamp(46px, 7vw, 80px);
}

.page-about .about-hero__eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  margin: 0 0 20px;
  padding: 7px 16px 7px 12px;
  border: 1px solid var(--line);
  border-radius: var(--pill);
  background: rgba(13, 41, 66, 0.7);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-hero__eyebrow .num {
  color: var(--cyan);
  letter-spacing: 0.1em;
}

.page-about .about-hero__title {
  margin: 0 0 24px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(30px, 5.4vw, 48px);
  line-height: 1.18;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-hero__title::after {
  content: "";
  display: block;
  width: 76px;
  height: 3px;
  margin-top: 22px;
  border-radius: var(--pill);
  background: var(--cyan);
}

.page-about .about-hero__lead {
  margin: 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-hero__aside-label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--muted);
}

.page-about .about-factlist {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line);
}

.page-about .about-factlist li {
  display: flex;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-factlist .num {
  flex: 0 0 auto;
  min-width: 4.6em;
  font-size: 18px;
  font-weight: 700;
  color: var(--cyan);
}

.page-about .about-factlist li > span:last-child {
  font-size: 14px;
  line-height: 1.65;
  color: var(--muted);
}

/* ---------- 面板通用 ---------- */

.page-about .about-part .panel__index {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--muted);
  text-decoration: none;
}

.page-about .about-part .panel__index:hover,
.page-about .about-part .panel__index:focus-visible {
  color: var(--cyan);
}

.page-about .about-part .panel__title {
  margin: 14px 0 16px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(22px, 3.2vw, 30px);
  line-height: 1.3;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-part .panel__lead {
  margin: 0 0 clamp(24px, 3.4vw, 36px);
  max-width: 64ch;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-split__main p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--ink-soft);
}

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

.page-about .about-split__main a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 229, 200, 0.4);
}

.page-about .about-split__main a:hover,
.page-about .about-split__main a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 起点锚点卡 ---------- */

.page-about .about-anchor {
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel-2);
  padding: clamp(22px, 3vw, 30px);
  box-shadow: var(--shadow-float);
}

.page-about .about-anchor__label {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-anchor__num {
  margin: 0 0 10px;
  font-size: clamp(38px, 6vw, 52px);
  line-height: 1;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.02em;
}

.page-about .about-anchor__desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--muted);
}

/* ---------- 人群三段 ---------- */

.page-about .about-phases {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-phase {
  background: var(--panel);
  padding: clamp(22px, 3vw, 30px);
}

.page-about .about-phase__time {
  display: inline-block;
  margin: 0 0 16px;
  padding: 4px 13px;
  border: 1px solid rgba(255, 122, 47, 0.45);
  border-radius: var(--pill);
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--orange);
}

.page-about .about-phase__title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  letter-spacing: -0.01em;
  color: var(--ink);
}

.page-about .about-phase p:last-child {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-aside-note {
  margin: clamp(20px, 3vw, 28px) 0 0;
  padding-left: 18px;
  border-left: 2px solid var(--gold);
  font-size: 14px;
  line-height: 1.8;
  color: var(--ink-soft);
}

/* ---------- 数据四步 ---------- */

.page-about .about-steps {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .about-step {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel-2);
  padding: 22px 22px 24px;
}

.page-about .about-step::before {
  content: "";
  position: absolute;
  top: -1px;
  left: 22px;
  width: 44px;
  height: 3px;
  border-radius: var(--pill);
  background: var(--cyan);
}

.page-about .about-step__no {
  display: block;
  margin-bottom: 12px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-step h3 {
  margin: 0 0 8px;
  font-family: var(--font-head);
  font-size: 16px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-step p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-rhythm {
  margin: clamp(26px, 3.6vw, 36px) 0 0;
  border-top: 1px solid var(--line);
}

.page-about .about-rhythm__row {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  justify-content: space-between;
  gap: 6px 20px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-rhythm dt {
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-rhythm dd {
  margin: 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--cyan);
}

/* ---------- 版本时间轴 ---------- */

.page-about .about-figure {
  margin: 0;
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel-2);
  overflow: hidden;
}

.page-about .media-frame {
  aspect-ratio: auto;
  height: auto;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-part .about-figure {
  margin-bottom: clamp(24px, 3.4vw, 32px);
}

.page-about .about-track {
  display: grid;
  gap: 14px;
}

.page-about .about-node {
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--panel-2);
  overflow: hidden;
}

.page-about .about-node summary {
  display: flex;
  align-items: center;
  gap: 14px;
  padding: 18px clamp(18px, 2.6vw, 26px);
  list-style: none;
  cursor: pointer;
}

.page-about .about-node summary::-webkit-details-marker {
  display: none;
}

.page-about .about-node summary::after {
  content: "+";
  margin-left: auto;
  font-family: var(--font-mono);
  font-size: 17px;
  color: var(--muted);
}

.page-about .about-node[open] summary::after {
  content: "−";
  color: var(--cyan);
}

.page-about .about-node summary:hover {
  background: rgba(23, 229, 200, 0.05);
}

.page-about .about-node summary:focus-visible {
  outline: 2px solid var(--cyan);
  outline-offset: -2px;
}

.page-about .about-node__no {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-node__year {
  padding: 3px 11px;
  border-radius: var(--pill);
  background: rgba(243, 184, 70, 0.14);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-node__name {
  font-family: var(--font-head);
  font-size: 15.5px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-node__body {
  padding: 0 clamp(18px, 2.6vw, 26px) 20px;
}

.page-about .about-node__body::before {
  content: "";
  display: block;
  height: 1px;
  margin-bottom: 16px;
  background: var(--line);
}

.page-about .about-node__body p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.85;
  color: var(--muted);
}

/* ---------- 团队 ---------- */

.page-about .about-team {
  background: linear-gradient(155deg, var(--grad-top) 0%, var(--panel) 52%, var(--panel-2) 100%);
  border-color: rgba(23, 229, 200, 0.22);
}

.page-about .about-figure--team {
  margin-bottom: 0;
}

.page-about .about-roster {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-roster li {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 6px 14px;
  padding: 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(6, 24, 43, 0.44);
  transition: border-color 180ms ease, background 180ms ease, transform 180ms ease;
}

.page-about .about-roster li:hover,
.page-about .about-roster li:focus-within {
  border-color: rgba(23, 229, 200, 0.6);
  background: rgba(23, 229, 200, 0.08);
  transform: translateX(4px);
}

.page-about .about-roster__num {
  min-width: 2.2em;
  font-size: 22px;
  font-weight: 700;
  color: var(--cyan);
  letter-spacing: -0.01em;
}

.page-about .about-roster__name {
  font-family: var(--font-head);
  font-size: 15px;
  font-weight: 700;
  color: var(--ink);
}

.page-about .about-roster__desc {
  flex: 1 1 100%;
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 合作生态 ---------- */

.page-about .about-figure--map {
  margin-bottom: 0;
}

/* ---------- 结尾入口 ---------- */

.page-about .about-next {
  margin-top: clamp(56px, 8vw, 96px);
  padding: clamp(28px, 4vw, 48px);
  border: 1px solid var(--line);
  border-radius: var(--r-lg);
  background: var(--panel);
}

.page-about .about-next__title {
  margin: 0 0 14px;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(20px, 2.8vw, 26px);
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--ink);
}

.page-about .about-next__lead {
  margin: 0 0 26px;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--ink-soft);
}

.page-about .about-next__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

.page-about .about-next__links {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  margin: 26px 0 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .about-next__links a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(23, 229, 200, 0.35);
}

.page-about .about-next__links a:hover,
.page-about .about-next__links a:focus-visible {
  border-bottom-color: var(--cyan);
}

/* ---------- 断点 ---------- */

@media (min-width: 720px) {
  .page-about .about-steps {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
  .page-about .about-phases {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
    align-items: end;
    gap: clamp(36px, 5vw, 76px);
  }
  .page-about .about-split {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }
  .page-about .about-split--team {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }
  .page-about .about-anchor {
    margin-right: -24px;
  }
}

@media (min-width: 1080px) {
  .page-about .about-steps {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-roster li,
  .page-about .about-node summary {
    transition: none;
  }
  .page-about .about-roster li:hover,
  .page-about .about-roster li:focus-within {
    transform: none;
  }
}