.page-about {
  --about-rule: rgba(143, 166, 191, 0.18);
  --about-rule-soft: rgba(143, 166, 191, 0.1);
  padding-bottom: clamp(2.5rem, 6vw, 5rem);
}

.page-about .about-crumb {
  padding-top: clamp(1rem, 2.5vw, 1.6rem);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  display: grid;
  gap: clamp(1.6rem, 4vw, 3rem);
  padding-block: clamp(1.2rem, 3vw, 2rem) clamp(2rem, 5vw, 3.6rem);
  border-bottom: 1px solid var(--line);
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  right: 0;
  top: 0;
  width: clamp(90px, 18vw, 220px);
  height: 3px;
  background: linear-gradient(90deg, transparent, var(--amber));
  pointer-events: none;
}

.page-about .about-hero__title {
  margin: 0.55rem 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(2.15rem, 7.4vw, 4.5rem);
  line-height: 1.05;
  letter-spacing: -0.03em;
  color: var(--cream);
}

.page-about .about-hero__title span {
  display: block;
  color: var(--ice);
}

.page-about .about-hero__lede {
  max-width: 40ch;
  margin: 1.15rem 0 0;
  font-family: var(--font-body);
  font-size: clamp(0.98rem, 2.4vw, 1.08rem);
  line-height: 1.78;
  color: var(--ice);
}

.page-about .about-metrics {
  margin: 1.7rem 0 0;
  border-top: 1px solid var(--line-strong);
}

.page-about .about-metrics__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.62rem 0;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .about-metrics dt {
  font-size: 0.86rem;
  letter-spacing: 0.02em;
  color: var(--ice);
}

.page-about .about-metrics dd {
  margin: 0;
  font-size: 1.06rem;
  color: var(--amber);
  white-space: nowrap;
}

.page-about .about-hero__figure {
  margin: 0;
}

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

@media (min-width: 980px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    align-items: end;
  }

  .page-about .about-hero__figure {
    align-self: stretch;
    display: flex;
    flex-direction: column;
    justify-content: flex-end;
  }
}

/* ---------- 章节骨架 ---------- */
.page-about .about-flow {
  display: block;
}

.page-about .about-section {
  padding-block: clamp(2rem, 5vw, 3.6rem);
  border-top: 1px solid var(--about-rule);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: clamp(2.2rem, 5vw, 3.4rem);
}

.page-about .about-section__head {
  display: grid;
  gap: 0.45rem;
  margin-bottom: clamp(1.2rem, 3vw, 2rem);
}

.page-about .about-section__mark {
  font-size: 0.8rem;
  letter-spacing: 0.16em;
  color: var(--amber);
  text-transform: uppercase;
}

.page-about .about-section__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(1.45rem, 3.4vw, 2.15rem);
  line-height: 1.22;
  letter-spacing: -0.02em;
  color: var(--cream);
}

.page-about .about-section__lede {
  max-width: 42ch;
  margin: 0 0 clamp(1.2rem, 3vw, 1.8rem);
  font-size: 1rem;
  line-height: 1.78;
  color: var(--ice);
}

@media (min-width: 900px) {
  .page-about .about-section__head {
    grid-template-columns: 12rem minmax(0, 1fr);
    align-items: baseline;
    gap: 1.6rem;
  }
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline-grid {
  display: grid;
  gap: clamp(1.3rem, 3vw, 2.2rem);
}

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

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .timeline__item {
  display: grid;
  grid-template-columns: 3.4rem minmax(0, 1fr);
  gap: 0.9rem;
  padding: 1rem 0;
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .timeline__item:first-child {
  border-top-color: var(--line-strong);
  padding-top: 0.35rem;
}

.page-about .timeline__year {
  margin: 0;
  font-size: 1rem;
  letter-spacing: 0.04em;
  color: var(--amber);
}

.page-about .timeline__title {
  margin: 0 0 0.32rem;
  font-family: var(--font-display);
  font-size: 1.02rem;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--cream);
}

.page-about .timeline__text p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--ice);
}

@media (min-width: 880px) {
  .page-about .about-timeline-grid {
    grid-template-columns: minmax(0, 0.7fr) minmax(0, 1fr);
    align-items: start;
  }
}

/* ---------- 岗位 ---------- */
.page-about .role-list {
  display: grid;
  gap: 0.75rem;
}

.page-about .role {
  position: relative;
  padding: 1.05rem 1.15rem 1.05rem 1.35rem;
  background: var(--panel);
  clip-path: var(--radius-cut);
  outline: none;
}

.page-about .role::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 3px;
  background: var(--rock);
  transition: background 0.18s ease;
}

.page-about .role:hover::before,
.page-about .role:focus-visible::before {
  background: var(--amber);
}

.page-about .role:focus-visible {
  box-shadow: inset 0 0 0 2px var(--amber);
}

.page-about .role__code {
  margin: 0 0 0.35rem;
  font-size: 0.76rem;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .role__name {
  margin: 0 0 0.42rem;
  font-family: var(--font-display);
  font-size: 1.1rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .role__desc {
  margin: 0 0 0.7rem;
  font-size: 0.93rem;
  line-height: 1.72;
  color: var(--ice);
}

.page-about .role__tag {
  display: inline-block;
  margin: 0;
}

.page-about .about-note {
  margin-top: clamp(1.1rem, 3vw, 1.6rem);
  padding-left: 1rem;
  border-left: 2px solid var(--moss);
}

.page-about .about-note p {
  margin: 0;
  max-width: 46ch;
  font-size: 0.96rem;
  line-height: 1.78;
  color: var(--ice);
}

@media (min-width: 760px) {
  .page-about .role-list {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

/* ---------- 档案 ---------- */
.page-about .archive-grid {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
}

.page-about .archive-demo {
  padding: clamp(1.1rem, 3vw, 1.6rem);
  background: var(--panel);
  align-self: start;
}

.page-about .archive-demo__label {
  margin: 0 0 0.6rem;
  font-size: 0.78rem;
  letter-spacing: 0.14em;
  color: var(--ice);
  text-transform: uppercase;
}

.page-about .archive-demo__code {
  margin: 0 0 1rem;
  font-size: clamp(1.5rem, 5.5vw, 2.15rem);
  letter-spacing: 0.06em;
  color: var(--electric);
  word-break: break-all;
}

.page-about .archive-demo__parts {
  list-style: none;
  margin: 0 0 0.9rem;
  padding: 0;
  display: grid;
  gap: 0.5rem;
}

.page-about .archive-demo__parts li {
  display: flex;
  align-items: baseline;
  gap: 0.7rem;
  padding-bottom: 0.45rem;
  border-bottom: 1px solid var(--about-rule-soft);
}

.page-about .archive-demo__parts span {
  min-width: 3.6rem;
  font-size: 0.95rem;
  color: var(--amber);
}

.page-about .archive-demo__parts em {
  font-style: normal;
  font-size: 0.9rem;
  color: var(--ice);
}

.page-about .archive-demo__foot {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.7;
  color: var(--ice);
}

.page-about .archive-text__title {
  margin: 0 0 0.9rem;
  font-family: var(--font-display);
  font-size: 1.08rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .source-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .source-list__item {
  display: grid;
  grid-template-columns: 4rem minmax(0, 1fr);
  gap: 0.8rem;
  align-items: start;
  padding: 0.85rem 0;
  border-top: 1px solid var(--about-rule-soft);
}

.page-about .source-list__item:first-child {
  border-top-color: var(--line-strong);
}

.page-about .source-list__tag {
  justify-self: start;
}

.page-about .source-list__item p {
  margin: 0;
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--ice);
}

.page-about .archive-text__foot {
  margin: 1.1rem 0 0;
  font-size: 0.92rem;
  line-height: 1.74;
  color: var(--ice);
  padding-left: 0.95rem;
  border-left: 2px solid var(--clay);
}

@media (min-width: 880px) {
  .page-about .archive-grid {
    grid-template-columns: minmax(0, 0.82fr) minmax(0, 1fr);
  }
}

/* ---------- 合作 ---------- */
.page-about .collab {
  position: relative;
  overflow: hidden;
  padding: clamp(1.3rem, 3.5vw, 2.4rem);
  background: var(--panel);
  clip-path: var(--radius-cut);
}

.page-about .collab__bg {
  position: absolute;
  inset: 0;
  z-index: 0;
  opacity: 0.24;
}

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

.page-about .collab__bg::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(120deg, rgba(11, 27, 43, 0.92) 28%, rgba(11, 27, 43, 0.55) 100%);
}

.page-about .collab__inner {
  position: relative;
  z-index: 1;
}

.page-about .collab__lede {
  max-width: 44ch;
  margin: 0 0 clamp(1.1rem, 3vw, 1.6rem);
  font-size: 1rem;
  line-height: 1.78;
  color: var(--cream);
}

.page-about .channels {
  display: grid;
  gap: 1rem;
}

.page-about .channel {
  padding-top: 0.85rem;
  border-top: 2px solid var(--rock);
}

.page-about .channel:nth-child(1) {
  border-top-color: var(--cyan);
}

.page-about .channel:nth-child(2) {
  border-top-color: var(--moss);
}

.page-about .channel:nth-child(3) {
  border-top-color: var(--clay);
}

.page-about .channel__title {
  margin: 0 0 0.42rem;
  font-family: var(--font-display);
  font-size: 1.04rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .channel__desc {
  margin: 0 0 0.6rem;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--ice);
}

.page-about .channel__link {
  display: inline-block;
  font-size: 0.88rem;
  letter-spacing: 0.04em;
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(56, 232, 208, 0.45);
  padding-bottom: 2px;
}

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

.page-about .review-steps {
  list-style: none;
  margin: clamp(1.2rem, 3vw, 1.7rem) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem 1.4rem;
}

.page-about .review-steps__item {
  display: inline-flex;
  align-items: baseline;
  gap: 0.45rem;
  font-size: 0.88rem;
  color: var(--ice);
}

.page-about .review-steps__no {
  font-size: 0.78rem;
  color: var(--amber);
}

.page-about .collab .btn {
  margin-top: clamp(1.1rem, 3vw, 1.6rem);
}

@media (min-width: 760px) {
  .page-about .channels {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 1.6rem;
  }
}

/* ---------- 范围与节奏 ---------- */
.page-about .rhythm {
  display: grid;
  gap: clamp(1.2rem, 3vw, 2rem);
}

.page-about .rhythm__title {
  margin: 0 0 0.6rem;
  font-family: var(--font-display);
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--cream);
}

.page-about .rhythm__col p {
  margin: 0 0 0.6rem;
  font-size: 0.95rem;
  line-height: 1.76;
  color: var(--ice);
  max-width: 40ch;
}

.page-about .rhythm__meta {
  font-size: 0.82rem;
  letter-spacing: 0.1em;
  color: var(--moss);
}

.page-about .rhythm__list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .rhythm__list li {
  padding: 0.72rem 0;
  border-top: 1px solid var(--about-rule-soft);
  font-size: 0.94rem;
  line-height: 1.72;
  color: var(--ice);
}

.page-about .rhythm__list span {
  display: inline-block;
  min-width: 3.4rem;
  color: var(--amber);
  font-size: 0.86rem;
}

.page-about .about-outro {
  margin-top: clamp(1.6rem, 4vw, 2.4rem);
  padding-top: clamp(1.2rem, 3vw, 1.7rem);
  border-top: 1px solid var(--line-strong);
}

.page-about .about-outro__text {
  margin: 0 0 1rem;
  max-width: 46ch;
  font-size: 1rem;
  line-height: 1.76;
  color: var(--cream);
}

.page-about .about-outro__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 0.7rem;
}

@media (min-width: 820px) {
  .page-about .rhythm {
    grid-template-columns: minmax(0, 0.85fr) minmax(0, 1.15fr);
    align-items: start;
  }
}
<<<END>>>