.page-about {
  --about-space: clamp(44px, 6vw, 76px);
  --about-text-sm: 15px;
  display: block;
}

/* ---------- 面包屑 ---------- */
.page-about .about-crumb {
  padding-top: 20px;
  padding-bottom: 4px;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(20px, 3.4vw, 36px) 0 clamp(40px, 6vw, 72px);
}

.page-about .about-hero__eyebrow {
  margin: 0 0 14px;
  color: var(--green);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
}

.page-about .about-hero__title {
  margin: 0 0 22px;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 7.2vw, 66px);
  line-height: 1.06;
  letter-spacing: 0.02em;
  color: var(--white);
}

.page-about .about-hero__lead {
  margin: 0 0 28px;
  max-width: 58ch;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-hero__facts {
  list-style: none;
  margin: 0 0 32px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 2px;
  border: 2px solid var(--line);
}

.page-about .about-hero__facts li {
  padding: 14px 16px;
  background: var(--ink-1);
  display: flex;
  align-items: baseline;
  gap: 10px;
}

.page-about .about-facts-num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  line-height: 1;
  color: var(--green);
}

.page-about .about-facts-lbl {
  font-size: 13px;
  color: var(--muted);
}

.page-about .about-hero__media {
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard);
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  display: block;
  padding-bottom: clamp(52px, 8vw, 96px);
}

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

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

/* ---------- 章节 ---------- */
.page-about .about-sec {
  padding-top: var(--about-space);
  margin-top: var(--about-space);
  border-top: 2px solid var(--line);
  background-image: var(--grid-lines);
  background-size: 24px 24px;
  background-repeat: repeat;
}

.page-about .about-sec:first-child {
  margin-top: 0;
  padding-top: 0;
  border-top: 0;
  background-image: none;
}

.page-about .about-head {
  display: flex;
  align-items: flex-end;
  gap: 12px;
  margin-bottom: 22px;
  flex-wrap: wrap;
}

.page-about .about-head__num {
  flex: none;
  font-family: var(--font-mono);
  font-size: clamp(44px, 11vw, 96px);
  font-weight: 700;
  line-height: 0.78;
  color: transparent;
  -webkit-text-stroke: 1.5px var(--line);
  letter-spacing: -0.02em;
}

.page-about .about-head__rule {
  flex: none;
  width: 26px;
  height: 2px;
  margin-bottom: 10px;
  background: var(--green);
}

.page-about .about-head__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(21px, 3.6vw, 30px);
  font-weight: 800;
  letter-spacing: 0.02em;
  line-height: 1.2;
  color: var(--white);
}

.page-about .about-lead {
  margin: 0 0 26px;
  padding-left: 16px;
  border-left: 3px solid var(--green);
  font-size: 16px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-link {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(94, 200, 255, 0.45);
}

.page-about .about-link:hover,
.page-about .about-link:focus-visible {
  color: var(--green);
  border-bottom-color: var(--green);
}

.page-about .about-tail {
  margin: 22px 0 0;
  font-size: var(--about-text-sm);
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 01 三张说明卡 ---------- */
.page-about .about-grid {
  display: grid;
  gap: 14px;
}

.page-about .about-card {
  position: relative;
  padding: 18px 18px 20px;
  background: var(--ink-2);
  border: 2px solid var(--line);
  box-shadow: var(--shadow-hard-sm);
  transition: transform 0.16s ease, box-shadow 0.16s ease, border-color 0.16s ease;
}

.page-about .about-card:hover,
.page-about .about-card:focus-within {
  transform: translate(4px, 4px);
  box-shadow: 0 0 0 var(--ink-1);
  border-color: var(--green);
}

.page-about .about-card__tag {
  margin: 0 0 10px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--green);
}

.page-about .about-card__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

.page-about .about-card__text {
  margin: 0;
  font-size: var(--about-text-sm);
  line-height: 1.8;
  color: var(--muted);
}

/* ---------- 02 版本序列 ---------- */
.page-about .about-versions {
  display: grid;
  gap: 12px;
}

.page-about .about-ver {
  padding: 18px;
  background: var(--ink-1);
  border: 2px solid var(--line);
  border-left-width: 6px;
  transition: border-color 0.16s ease, background 0.16s ease, transform 0.16s ease;
}

.page-about .about-ver:hover {
  transform: translateX(3px);
  border-color: var(--green);
  background: var(--ink-2);
}

.page-about .about-ver--v1 {
  border-left-color: var(--line);
}

.page-about .about-ver--v15 {
  border-left-color: var(--cyan);
}

.page-about .about-ver--v2 {
  border-left-color: var(--green);
}

.page-about .about-ver__tag {
  display: inline-block;
  margin: 0 0 12px;
  padding: 3px 9px;
  font-family: var(--font-mono);
  font-size: 12px;
  font-weight: 700;
  letter-spacing: 0.14em;
  color: var(--ink-0);
  background: var(--muted);
}

.page-about .about-ver--v15 .about-ver__tag {
  background: var(--cyan);
}

.page-about .about-ver--v2 .about-ver__tag {
  background: var(--green);
}

.page-about .about-ver__title {
  margin: 0 0 10px;
  font-size: 18px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--white);
}

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

.page-about .about-ver__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 7px;
}

.page-about .about-ver__list li {
  position: relative;
  padding-left: 18px;
  font-family: var(--font-mono);
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .about-ver__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.68em;
  width: 9px;
  height: 2px;
  background: var(--green);
}

/* ---------- 02 演进折线 ---------- */
.page-about .about-trend {
  margin: 22px 0 0;
  padding: 14px 12px 6px;
  border: 2px solid var(--line);
  background: var(--ink-1);
  overflow: hidden;
}

.page-about .about-trend svg {
  display: block;
  width: 100%;
  height: auto;
}

.page-about .about-trend__axis {
  stroke: var(--line);
  stroke-width: 2;
}

.page-about .about-trend__grid {
  stroke: rgba(42, 58, 87, 0.7);
  stroke-width: 1;
  stroke-dasharray: 4 6;
}

.page-about .about-trend__line {
  fill: none;
  stroke: var(--green);
  stroke-width: 2.5;
  stroke-linejoin: round;
}

.page-about .about-trend__dot {
  fill: var(--ink-0);
  stroke: var(--green);
  stroke-width: 2;
}

.page-about .about-trend__label {
  fill: var(--muted);
  font-family: var(--font-mono);
  font-size: 13px;
  text-anchor: middle;
}

.page-about .about-trend__cap {
  margin: 8px 0 8px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--muted);
  text-align: right;
}

/* ---------- 03 团队与流程 ---------- */
.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-teams {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
}

.page-about .about-team {
  display: grid;
  gap: 6px;
  padding: 15px 16px;
  background: var(--ink-2);
  border: 2px solid var(--line);
}

.page-about .about-team__name {
  margin: 0;
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 12px;
  font-size: 16px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-team__size {
  font-family: var(--font-mono);
  font-size: 13px;
  font-weight: 400;
  color: var(--green);
}

.page-about .about-team__text {
  margin: 0;
  font-size: var(--about-text-sm);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-flow {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  border-top: 2px solid var(--line);
}

.page-about .about-flow li {
  display: grid;
  grid-template-columns: 34px minmax(0, 1fr);
  gap: 10px;
  padding: 12px 0;
  border-bottom: 1px dashed var(--line);
}

.page-about .about-flow__num {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--green);
  padding-top: 4px;
}

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

.page-about .about-flow__body strong {
  color: var(--white);
  font-weight: 700;
  margin-right: 6px;
}

.page-about .about-split__media {
  border: 2px solid var(--line);
}

/* ---------- 04 数据来源 ---------- */
.page-about .about-band {
  margin: 0 0 20px;
  border: 2px solid var(--line);
}

.page-about .about-facts {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 2px;
  border-top: 2px solid var(--line);
}

.page-about .about-facts li {
  display: grid;
  gap: 6px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-facts__key {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--orange);
  text-transform: uppercase;
}

.page-about .about-facts__val {
  margin: 0;
  font-size: var(--about-text-sm);
  line-height: 1.8;
  color: var(--text);
}

/* ---------- 05 内容标准 ---------- */
.page-about .about-rules {
  display: grid;
  gap: 16px;
}

.page-about .about-rule {
  padding-top: 14px;
  border-top: 2px solid var(--green);
}

.page-about .about-rule__title {
  position: relative;
  margin: 0 0 8px;
  padding-left: 16px;
  font-size: 17px;
  font-weight: 700;
  color: var(--white);
}

.page-about .about-rule__title::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.52em;
  width: 8px;
  height: 8px;
  background: var(--green);
}

.page-about .about-rule__text {
  margin: 0;
  font-size: var(--about-text-sm);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-series {
  margin-top: 28px;
  padding: 18px;
  background: var(--ink-1);
  border: 2px solid var(--line);
}

.page-about .about-series__label {
  margin: 0 0 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.08em;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-series__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-series__item {
  display: grid;
  gap: 6px;
}

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

/* ---------- 06 联络 ---------- */
.page-about .about-sec--last {
  background-image: none;
}

.page-about .about-contact {
  display: grid;
  gap: 20px;
  padding: clamp(18px, 3.6vw, 30px);
  border: 2px solid var(--green);
  background: var(--green-deep);
  box-shadow: var(--shadow-hard);
}

.page-about .about-contact__title {
  margin: 0 0 16px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.6;
  color: var(--white);
}

.page-about .about-contact__line {
  margin: 0 0 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 12px;
  font-size: var(--about-text-sm);
  line-height: 1.7;
  color: var(--text);
  word-break: break-word;
}

.page-about .about-contact__key {
  flex: none;
  min-width: 64px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--green);
  padding-top: 3px;
}

.page-about .about-contact__note {
  margin: 14px 0 0;
  padding-top: 12px;
  border-top: 1px solid rgba(61, 242, 164, 0.35);
  font-size: 13px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-contact__aside {
  display: flex;
  flex-direction: column;
  gap: 10px;
  align-items: stretch;
}

.page-about .about-contact__btn {
  text-align: center;
}

.page-about .about-contact__legal {
  margin: 4px 0 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--muted);
}

/* ---------- 响应式 ---------- */
@media (min-width: 600px) {
  .page-about .about-hero__facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

  .page-about .about-hero__facts li {
    flex-direction: column;
    gap: 4px;
  }

  .page-about .about-facts li {
    grid-template-columns: 78px minmax(0, 1fr);
    gap: 16px;
    align-items: baseline;
  }
}

@media (min-width: 760px) {
  .page-about .about-grid--3 {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

  .page-about .about-ver__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 8px 16px;
  }

  .page-about .about-rules {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px 28px;
  }

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

  .page-about .about-split__media {
    order: -1;
  }

  .page-about .about-series__list {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-contact {
    grid-template-columns: minmax(0, 1fr) 220px;
    align-items: start;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(0, 1fr) 260px;
    align-items: start;
    gap: 28px;
  }

  .page-about .about-split__media {
    order: 0;
    position: sticky;
    top: 28px;
  }
}

@media (min-width: 1040px) {
  .page-about .about-shell {
    display: grid;
    grid-template-columns: 216px minmax(0, 1fr);
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-rail {
    display: block;
    position: sticky;
    top: 28px;
    padding-left: 18px;
    border-left: 2px solid var(--line);
  }

  .page-about .about-rail__label {
    margin: 0 0 14px;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.14em;
    color: var(--line);
    text-transform: uppercase;
  }

  .page-about .about-rail__list {
    list-style: none;
    margin: 0;
    padding: 0;
    display: grid;
    gap: 2px;
  }

  .page-about .about-rail__link {
    display: flex;
    align-items: baseline;
    gap: 10px;
    padding: 9px 6px 9px 0;
    text-decoration: none;
    border-bottom: 1px solid rgba(42, 58, 87, 0.7);
    transition: color 0.15s ease, padding-left 0.15s ease;
  }

  .page-about .about-rail__num {
    flex: none;
    font-family: var(--font-mono);
    font-size: 11px;
    color: var(--green);
    opacity: 0.55;
  }

  .page-about .about-rail__text {
    font-size: 13px;
    line-height: 1.5;
    color: var(--muted);
  }

  .page-about .about-rail__link:hover,
  .page-about .about-rail__link:focus-visible {
    padding-left: 6px;
  }

  .page-about .about-rail__link:hover .about-rail__text,
  .page-about .about-rail__link:focus-visible .about-rail__text {
    color: var(--white);
  }

  .page-about .about-rail__link:hover .about-rail__num,
  .page-about .about-rail__link:focus-visible .about-rail__num {
    opacity: 1;
  }

  .page-about .about-hero__lead {
    max-width: 62ch;
    font-size: 17px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-card,
  .page-about .about-ver,
  .page-about .about-rail__link {
    transition: none;
  }

  .page-about .about-card:hover,
  .page-about .about-card:focus-within,
  .page-about .about-ver:hover {
    transform: none;
  }
}
<<<END>>>