.page-about {
  --about-body: #C8D1EC;
  --yr-side: 200px;
  --yr-gap: clamp(24px, 4vw, 56px);
  display: block;
  background: var(--scene-light), var(--ink-800);
}

.page-about .page-shell {
  padding-inline: var(--gutter);
}

/* ---------- 开篇 ---------- */
.page-about .about-opener {
  padding: clamp(32px, 6vw, 72px) 0 clamp(30px, 4vw, 56px);
}

.page-about .about-opener .crumbs {
  margin-bottom: clamp(26px, 4vw, 46px);
}

.page-about .op-kicker {
  margin: 0 0 18px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .op-title {
  margin: 0;
  max-width: 900px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(34px, 7vw, 68px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .op-lead {
  margin: 24px 0 0;
  max-width: 660px;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .op-figures {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(32px, 5vw, 56px) 0 0;
  padding: 1px;
  list-style: none;
  background: var(--line-soft);
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .op-figures li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 20px 20px 22px;
  background: var(--ink-700);
}

.page-about .op-num {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(26px, 3.4vw, 36px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .op-cap {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* ---------- 章节骨架 ---------- */
.page-about .yr {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
  padding: clamp(48px, 7vw, 88px) 0;
}

.page-about .yr + .yr {
  border-top: 1px solid var(--line-soft);
}

.page-about .yr__side {
  display: flex;
  flex-direction: row;
  align-items: baseline;
  gap: 14px;
}

.page-about .yr__no {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(38px, 5vw, 60px);
  line-height: 0.9;
  letter-spacing: -0.03em;
  color: var(--indigo);
  opacity: 0.62;
}

.page-about .yr__meta {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--text-dim);
  white-space: nowrap;
}

.page-about .yr__body {
  min-width: 0;
  max-width: 940px;
}

.page-about .yr__title {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(24px, 3.6vw, 40px);
  line-height: 1.24;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .yr__body > p {
  margin: 0 0 18px;
  max-width: 640px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--about-body);
}

/* ---------- 图片 ---------- */
.page-about .shot {
  margin: clamp(28px, 4vw, 44px) 0;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
  overflow: hidden;
}

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

.page-about .shot figcaption {
  padding: 12px 18px 14px;
  font-size: 13px;
  line-height: 1.65;
  color: var(--text-dim);
  border-top: 1px solid var(--line-soft);
}

/* ---------- 四条主线 ---------- */
.page-about .rails {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
  margin: 30px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .rails li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding: 22px 22px 20px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
  transition: border-color 0.18s ease, transform 0.18s ease;
}

.page-about .rails li:hover {
  border-color: var(--glass-border);
  transform: translateY(-2px);
}

.page-about .rails__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--orange);
}

.page-about .rails__t {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 18px;
  line-height: 1.45;
  color: var(--text);
}

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

.page-about .rails__link {
  margin-top: 4px;
  font-size: 13px;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 199, 0.35);
  align-self: flex-start;
  padding-bottom: 1px;
}

.page-about .rails__link:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 版本时间轴 ---------- */
.page-about .vers {
  display: flex;
  flex-direction: column;
  gap: 10px;
  margin: 30px 0 0;
}

.page-about .ver {
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
  overflow: hidden;
  transition: border-color 0.18s ease;
}

.page-about .ver[open] {
  border-color: var(--glass-border);
  background: linear-gradient(180deg, rgba(0, 229, 199, 0.07), var(--ink-700) 68%);
}

.page-about .ver__summary {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr) auto;
  align-items: center;
  gap: 14px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 15px;
  color: var(--text);
}

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

.page-about .ver__summary:hover {
  background: rgba(0, 229, 199, 0.05);
}

.page-about .ver__when {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.06em;
  color: var(--cyan);
  white-space: nowrap;
}

.page-about .ver__dot {
  flex: none;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--ink-800);
  border: 2px solid var(--indigo);
  transition: background 0.18s ease, border-color 0.18s ease;
}

.page-about .ver[open] .ver__dot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(0, 229, 199, 0.16);
}

.page-about .ver__title {
  min-width: 0;
  font-weight: 600;
  line-height: 1.5;
}

.page-about .ver__chev {
  position: relative;
  flex: none;
  width: 18px;
  height: 18px;
}

.page-about .ver__chev::before,
.page-about .ver__chev::after {
  content: "";
  position: absolute;
  background: var(--indigo);
  transition: transform 0.18s ease, opacity 0.18s ease;
}

.page-about .ver__chev::before {
  left: 0;
  right: 0;
  top: 8px;
  height: 2px;
}

.page-about .ver__chev::after {
  top: 0;
  bottom: 0;
  left: 8px;
  width: 2px;
}

.page-about .ver[open] .ver__chev::after {
  transform: scaleY(0);
  opacity: 0;
}

.page-about .ver__body {
  padding: 0 18px 20px;
}

.page-about .ver__body p {
  margin: 0;
  max-width: 620px;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text-dim);
}

/* ---------- 团队流程 SVG ---------- */
.page-about .flow-wrap {
  margin: 26px 0 4px;
  overflow-x: auto;
  overflow-y: hidden;
  padding-bottom: 8px;
}

.page-about .flow {
  display: block;
  width: 100%;
  min-width: 700px;
  height: auto;
}

.page-about .flow__label {
  font-family: var(--font-body);
  font-size: 15px;
  font-weight: 600;
  fill: var(--text);
}

.page-about .flow__sub {
  font-family: var(--font-mono);
  font-size: 12px;
  fill: var(--text-dim);
}

/* ---------- 团队岗位 ---------- */
.page-about .team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
  margin: 26px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .team li {
  padding: 22px 22px 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-about .team__t {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 16px;
  line-height: 1.5;
  color: var(--cyan);
}

.page-about .team__d {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .facts {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 22px 24px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .facts li {
  display: flex;
  flex-direction: column;
  gap: 8px;
  padding-left: 14px;
  border-left: 2px solid var(--orange);
}

.page-about .facts__n {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(22px, 3vw, 30px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--text);
}

.page-about .facts__l {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* ---------- 专题库体量 ---------- */
.page-about .depth {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 28px 24px;
  margin: 34px 0 0;
  padding: 0;
  list-style: none;
}

.page-about .depth li {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding-top: 16px;
  border-top: 1px solid var(--line);
}

.page-about .depth__n {
  font-family: var(--font-mono);
  font-weight: 600;
  font-size: clamp(24px, 3.4vw, 34px);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--cyan);
}

.page-about .depth__l {
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-dim);
}

/* ---------- 社群与认可 ---------- */
.page-about .pact {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
  margin: 32px 0 0;
}

.page-about .pact__main {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
  gap: 14px;
  padding: 26px 24px;
  border: 1px solid var(--glass-border);
  border-radius: var(--radius);
  background: var(--glass);
}

.page-about .pact__t {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: 19px;
  line-height: 1.45;
  color: var(--text);
}

.page-about .pact__d {
  margin: 0;
  max-width: 520px;
  font-size: 14px;
  line-height: 1.8;
  color: var(--about-body);
}

.page-about .award {
  display: flex;
  flex-direction: column;
  gap: 10px;
  padding: 26px 24px;
  border: 1px solid var(--line-soft);
  border-radius: var(--radius);
  background: var(--ink-700);
}

.page-about .award__y {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--orange);
}

.page-about .award__t {
  font-family: var(--font-display);
  font-weight: 800;
  font-size: 20px;
  line-height: 1.4;
  color: var(--text);
}

.page-about .award__s {
  font-size: 13px;
  color: var(--text-dim);
}

.page-about .award__d {
  margin: 4px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-dim);
}

/* ---------- 收尾 ---------- */
.page-about .closing .yr__body > p {
  max-width: 660px;
}

.page-about .closing__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin: 28px 0 0;
}

.page-about .closing__note {
  margin: 24px 0 0;
  max-width: 640px;
  font-size: 13px;
  line-height: 1.8;
  color: var(--text-dim);
}

.page-about .closing__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(0, 229, 199, 0.35);
}

.page-about .closing__note a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .op-figures {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .facts,
  .page-about .depth {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .team {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .team li:nth-child(2) {
    margin-top: 24px;
  }

  .page-about .team li:nth-child(3) {
    margin-top: 48px;
  }
}

@media (min-width: 900px) {
  .page-about .yr {
    grid-template-columns: var(--yr-side) minmax(0, 1fr);
    gap: var(--yr-gap);
    padding: clamp(72px, 8vw, 112px) 0;
  }

  .page-about .yr__side {
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
    position: sticky;
    top: calc(var(--header-h) + 28px);
    align-self: start;
  }

  .page-about .pact {
    grid-template-columns: 1.15fr 0.85fr;
    gap: 28px;
    align-items: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .rails li,
  .page-about .ver__chev::before,
  .page-about .ver__chev::after,
  .page-about .ver__dot {
    transition: none;
  }

  .page-about .rails li:hover {
    transform: none;
  }
}