.page-about {
  --about-hair: var(--stroke-soft);
  --about-tint: rgba(23, 230, 195, .07);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-block: clamp(22px, 4vw, 44px) clamp(38px, 5vw, 68px);
}
.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
}
.page-about .about-hero__text {
  display: grid;
  gap: 14px;
  align-content: start;
  max-width: 62ch;
}
.page-about .about-hero__text .t-lead {
  margin: 0;
  color: var(--white);
  max-width: 54ch;
}
.page-about .about-hero__media {
  position: relative;
  margin: 0;
}
.page-about .about-hero__media img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 3 / 2;
  object-fit: cover;
  clip-path: polygon(0 0, 100% 0, 100% 100%, 0 calc(100% - 26px));
}

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, .95fr);
    align-items: end;
  }
}

/* ---------- 区块标题（页面级） ---------- */
.page-about .about-sec {
  display: grid;
  gap: 10px;
  max-width: 64ch;
}
.page-about .about-sec__lead {
  margin: 0;
  color: var(--mist);
  font-size: 15px;
  line-height: 1.75;
}

/* ---------- S00 起点 ---------- */
.page-about .about-origin__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3.2vw, 40px);
  margin-top: clamp(20px, 3vw, 34px);
}
.page-about .about-origin__body p {
  margin: 0 0 14px;
  color: var(--white);
  font-size: 16px;
  line-height: 1.8;
  max-width: 60ch;
}
.page-about .about-origin__body p:last-child {
  margin-bottom: 0;
}

.page-about .about-stats {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}
.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 3px;
  padding: 16px 14px 18px;
  background: var(--pitch);
  transition: background var(--dur) var(--ease);
}
.page-about .about-stat:hover {
  background: var(--about-tint);
}
.page-about .about-stat__num {
  font-size: 26px;
  line-height: 1.1;
  color: var(--cyan);
}
.page-about .about-stat__unit {
  font-size: 12px;
}
.page-about .about-stat__label {
  margin-top: 4px;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.6;
}

@media (min-width: 880px) {
  .page-about .about-origin__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- S01 口径示例表 ---------- */
.page-about .about-rules .table-wrap {
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  margin-top: clamp(18px, 3vw, 30px);
}
.page-about .about-table {
  width: 100%;
  min-width: 660px;
  border-collapse: collapse;
}
.page-about .about-table caption {
  text-align: left;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
  padding-bottom: 12px;
}
.page-about .about-table th[scope="col"] {
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .08em;
  text-transform: uppercase;
  color: var(--cyan);
  text-align: left;
  padding: 10px 14px;
  border-bottom: 1px solid var(--cyan);
  white-space: nowrap;
}
.page-about .about-table th[scope="row"] {
  color: var(--white);
  font-weight: 500;
  font-size: 15px;
  text-align: left;
  padding: 13px 14px;
  border-bottom: 1px solid var(--about-hair);
  white-space: nowrap;
}
.page-about .about-table td {
  color: var(--mist);
  font-size: 14px;
  line-height: 1.65;
  padding: 13px 14px;
  border-bottom: 1px solid var(--about-hair);
  vertical-align: top;
}
.page-about .about-table tbody tr {
  transition: background var(--dur) var(--ease);
}
.page-about .about-table tbody tr:hover {
  background: var(--about-tint);
}
.page-about .about-rules .note {
  margin-top: 14px;
  max-width: 72ch;
  font-size: 13px;
  line-height: 1.75;
}

/* ---------- S02 标注流程时间线 ---------- */
.page-about .about-process__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 3.6vw, 48px);
  margin-top: clamp(20px, 3vw, 34px);
}
.page-about .about-timeline {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 0 0 0 36px;
}
.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 10px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan) 0%, var(--about-hair) 48%, rgba(44, 90, 80, 0) 100%);
}
.page-about .tl-item {
  position: relative;
}
.page-about .tl-item + .tl-item {
  margin-top: 10px;
}
.page-about .tl-item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 18px;
  width: 9px;
  height: 9px;
  border: 1px solid var(--cyan);
  background: var(--night);
  transform: rotate(45deg);
  transition: background var(--dur) var(--ease);
}
.page-about .tl-item:hover::before,
.page-about .tl-item:focus-within::before {
  background: var(--cyan);
}
.page-about .tl-node {
  border: 1px solid var(--about-hair);
  background: var(--glass);
  backdrop-filter: blur(6px);
  transition: border-color var(--dur) var(--ease);
}
.page-about .tl-node:hover,
.page-about .tl-node[open] {
  border-color: var(--cyan);
}
.page-about .tl-sum {
  list-style: none;
  cursor: pointer;
  display: grid;
  grid-template-columns: auto 1fr auto;
  gap: 2px 12px;
  align-items: center;
  padding: 14px 16px;
}
.page-about .tl-sum::-webkit-details-marker {
  display: none;
}
.page-about .tl-sum::marker {
  content: "";
}
.page-about .tl-no {
  grid-column: 1;
  grid-row: 1;
  color: var(--cyan);
  font-size: 13px;
  letter-spacing: .08em;
}
.page-about .tl-when {
  grid-column: 2;
  grid-row: 1;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: .04em;
  color: var(--mist);
}
.page-about .tl-name {
  grid-column: 2 / 4;
  grid-row: 2;
  font-size: 17px;
  font-weight: 500;
  color: var(--white);
  line-height: 1.5;
}
.page-about .tl-sum::after {
  content: "+";
  grid-column: 3;
  grid-row: 1;
  justify-self: end;
  font-family: var(--font-mono);
  font-size: 15px;
  color: var(--cyan);
  line-height: 1;
}
.page-about .tl-node[open] .tl-sum::after {
  content: "–";
}
.page-about .tl-body {
  margin: 2px 16px 16px;
  padding-top: 12px;
  border-top: 1px solid var(--about-hair);
  color: var(--mist);
  font-size: 14px;
  line-height: 1.8;
}
.page-about .about-process__figure {
  margin: 0;
  align-self: start;
}
.page-about .about-process__figure img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 10 / 7;
  object-fit: cover;
  filter: saturate(.72) brightness(.86);
}

@media (min-width: 960px) {
  .page-about .about-process__grid {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, .7fr);
    align-items: start;
  }
}

/* ---------- S03 团队构成 ---------- */
.page-about .about-team__grid {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}
.page-about .team-card {
  display: flex;
  flex-direction: column;
  gap: 7px;
  padding: 20px 18px 24px;
  background: var(--night);
  transition: background var(--dur) var(--ease);
}
.page-about .team-card:hover {
  background: var(--about-tint);
}
.page-about .team-card__count {
  font-size: 32px;
  line-height: 1;
  color: var(--cyan);
}
.page-about .team-card__count .unit {
  font-size: 12px;
  letter-spacing: .04em;
}
.page-about .team-card__role {
  margin: 2px 0 0;
  font-size: 17px;
  font-weight: 500;
  color: var(--white);
  letter-spacing: .02em;
}
.page-about .team-card__desc {
  margin: 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
}
.page-about .about-team .note {
  margin-top: 16px;
  max-width: 68ch;
  font-size: 13px;
  line-height: 1.75;
}

@media (min-width: 640px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}
@media (min-width: 1040px) {
  .page-about .about-team__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* ---------- S04 版本演进 ---------- */
.page-about .about-versions__frame {
  margin: clamp(20px, 3vw, 32px) 0 clamp(18px, 2.6vw, 26px);
  position: relative;
  overflow: hidden;
}
.page-about .about-versions__frame img {
  display: block;
  width: 100%;
  height: auto;
  aspect-ratio: 2 / 1;
  object-fit: cover;
  filter: saturate(.6) brightness(.7);
}
.page-about .vs-strip {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-auto-flow: column;
  grid-auto-columns: minmax(214px, 1fr);
  gap: 1px;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  scroll-snap-type: x proximity;
}
.page-about .vs-cell {
  scroll-snap-align: start;
  display: flex;
  flex-direction: column;
  gap: 9px;
  min-height: 208px;
  padding: 18px 16px 22px;
  background: var(--night);
  transition: background var(--dur) var(--ease);
}
.page-about .vs-cell:hover {
  background: var(--about-tint);
}
.page-about .vs-mark {
  display: flex;
  align-items: center;
  gap: 9px;
  margin: 0;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: .1em;
  color: var(--gold);
}
.page-about .vs-dot {
  width: 7px;
  height: 7px;
  background: var(--gold);
  transform: rotate(45deg);
  flex: 0 0 auto;
}
.page-about .vs-name {
  margin: 0;
  font-size: 16px;
  font-weight: 500;
  color: var(--white);
  line-height: 1.5;
}
.page-about .vs-note {
  margin: 0;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.8;
}

/* ---------- S05 图例 ---------- */
.page-about .legend-grid {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-hair);
  border: 1px solid var(--about-hair);
}
.page-about .legend-card {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 6px 14px;
  align-items: start;
  padding: 18px 18px 22px;
  background: var(--glass);
  backdrop-filter: blur(4px);
  transition: background var(--dur) var(--ease);
}
.page-about .legend-card:hover {
  background: var(--about-tint);
}
.page-about .legend-card__mark {
  grid-row: span 2;
  min-width: 24px;
  text-align: center;
  font-size: 17px;
  line-height: 1.5;
  font-family: var(--font-mono);
  color: var(--white);
}
.page-about .legend-card__term {
  font-size: 15px;
  font-weight: 500;
  color: var(--white);
  letter-spacing: .02em;
}
.page-about .legend-card__desc {
  grid-column: 2;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
}
.page-about .about-legend .note {
  margin-top: 16px;
  max-width: 72ch;
  font-size: 13px;
  line-height: 1.8;
}

@media (min-width: 700px) {
  .page-about .legend-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- S06 继续阅读 ---------- */
.page-about .about-next__list {
  list-style: none;
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--about-hair);
  border-top: 1px solid var(--about-hair);
  border-bottom: 1px solid var(--about-hair);
}
.page-about .about-next__item {
  display: grid;
  grid-template-columns: 1fr;
  gap: 5px;
  padding: 16px 14px;
  background: var(--night);
  transition: background var(--dur) var(--ease);
}
.page-about .about-next__item:hover {
  background: var(--about-tint);
}
.page-about .about-next__link {
  font-size: 17px;
  color: var(--white);
}
.page-about .about-next__desc {
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
}

@media (min-width: 720px) {
  .page-about .about-next__item {
    grid-template-columns: 232px minmax(0, 1fr);
    align-items: baseline;
    gap: 22px;
    padding: 18px 18px;
  }
}
<<<END>>>