.page-about {
  --about-gap: clamp(20px, 3vw, 36px);
  --about-cut: var(--cut);
  --about-cut-sm: var(--cut-sm);
  background:
    radial-gradient(120% 60% at 80% 0%, rgba(0, 245, 212, 0.09), transparent 62%),
    radial-gradient(90% 50% at 0% 30%, rgba(22, 52, 74, 0.55), transparent 70%),
    var(--night);
  color: var(--snow);
  font-family: var(--font-body);
  padding-bottom: clamp(32px, 6vw, 72px);
  overflow-x: hidden;
}

.page-about .about-crumb {
  padding-top: clamp(14px, 2.4vw, 26px);
}

.page-about .section {
  padding-block: clamp(36px, 6vw, 78px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-top: clamp(10px, 2vw, 22px);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-hero__lead {
  position: relative;
  padding-top: 18px;
  border-top: 2px solid var(--signal);
}

.page-about .about-hero__title {
  font-family: var(--font-display);
  font-size: clamp(30px, 6.2vw, 64px);
  line-height: 1.04;
  letter-spacing: -0.02em;
  margin: 14px 0 18px;
  color: var(--snow);
  text-wrap: balance;
}

.page-about .about-hero__intro {
  margin: 0 0 14px;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.78;
  color: var(--frost);
}

.page-about .about-hero__intro:first-of-type {
  color: var(--snow);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about .about-index {
  clip-path: var(--about-cut);
  background: linear-gradient(155deg, var(--night-2) 0%, rgba(0, 245, 212, 0.07) 100%);
  border: 1px solid var(--line-strong);
  padding: 18px 18px 8px;
}

.page-about .about-index__cap {
  margin: 0 0 12px;
  color: var(--cyan);
  letter-spacing: 0.16em;
}

.page-about .about-index__item {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 11px 8px;
  border-bottom: 1px solid var(--line);
  color: var(--snow);
  font-size: 15px;
  line-height: 1.4;
  text-decoration: none;
  transition: background-color 180ms ease, color 180ms ease, padding-left 180ms ease;
}

.page-about .about-index__item:last-child {
  border-bottom: 0;
}

.page-about .about-index__item:hover,
.page-about .about-index__item:focus-visible {
  background: rgba(0, 245, 212, 0.12);
  color: var(--cyan);
  padding-left: 14px;
}

.page-about .about-index__no {
  font-family: var(--font-mono);
  font-size: 12px;
  color: var(--signal);
  letter-spacing: 0.08em;
  flex: none;
}

/* ---------- 章节标题 ---------- */
.page-about .about-head {
  display: grid;
  gap: 10px;
  max-width: 74ch;
  margin-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-head .mono-label {
  color: var(--cyan);
  letter-spacing: 0.14em;
  margin: 0;
}

.page-about .about-head__title {
  font-family: var(--font-display);
  font-size: clamp(24px, 4vw, 40px);
  line-height: 1.12;
  letter-spacing: -0.015em;
  margin: 0;
  color: var(--snow);
}

.page-about .about-head__sub {
  margin: 0;
  font-size: 16px;
  line-height: 1.75;
  color: var(--frost);
}

.page-about .prose {
  margin: 0 0 14px;
  font-size: 16px;
  line-height: 1.78;
  color: var(--frost);
}

/* ---------- 理念 ---------- */
.page-about .about-ethos__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-ethos__list {
  list-style: none;
  margin: 20px 0 0;
  padding: 0;
  display: grid;
  gap: 12px;
}

.page-about .about-ethos__list li {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 14px;
  background: rgba(10, 27, 44, 0.72);
  border-left: 2px solid var(--steel);
  font-size: 15px;
  line-height: 1.7;
  color: var(--frost);
}

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

.page-about .about-ethos__media {
  margin: 0;
  border: 1px solid var(--line-strong);
  clip-path: var(--about-cut);
  overflow: hidden;
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline__media {
  margin: 0 0 clamp(18px, 3vw, 30px);
  border: 1px solid var(--line);
  clip-path: var(--about-cut);
  overflow: hidden;
}

.page-about .about-timeline__tabs {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  border-bottom: 1px solid var(--line);
  padding-bottom: 14px;
}

.page-about .about-timeline__tab {
  flex: 1 1 132px;
  display: grid;
  gap: 4px;
  padding: 12px 14px;
  background: var(--night-2);
  border: 1px solid var(--line);
  color: var(--frost);
  text-align: left;
  cursor: pointer;
  clip-path: var(--about-cut-sm);
  transition: background-color 180ms ease, color 180ms ease, border-color 180ms ease;
}

.page-about .about-timeline__tab:hover {
  border-color: var(--line-strong);
  color: var(--snow);
}

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

.page-about .about-timeline__tab[aria-selected="true"] {
  background: var(--signal);
  border-color: var(--signal);
  color: var(--night);
}

.page-about .about-timeline__year {
  font-family: var(--font-mono);
  font-size: 17px;
  font-weight: 700;
  letter-spacing: 0.04em;
}

.page-about .about-timeline__label {
  font-size: 13px;
  line-height: 1.35;
}

.page-about .about-timeline__panels {
  display: grid;
  gap: 14px;
  margin-top: clamp(16px, 2.6vw, 26px);
}

.page-about .about-timeline__panel {
  background: rgba(10, 27, 44, 0.78);
  border-left: 3px solid var(--signal);
  padding: 18px 20px;
  clip-path: var(--about-cut-sm);
}

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

.page-about .about-timeline__stage {
  margin: 0 0 6px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-timeline__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 24px);
  line-height: 1.25;
  color: var(--snow);
}

.page-about .about-timeline__panel .prose {
  margin-bottom: 0;
}

/* ---------- 四条内容线 ---------- */
.page-about .about-lines__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-line {
  --line-accent: var(--cyan);
  position: relative;
  padding: 20px 20px 18px;
  background: linear-gradient(160deg, rgba(10, 27, 44, 0.94), rgba(5, 10, 18, 0.94));
  border: 1px solid var(--line);
  border-top: 3px solid var(--line-accent);
  clip-path: var(--about-cut-sm);
  transition: transform 200ms ease, border-color 200ms ease;
}

.page-about .about-line:nth-child(2) {
  --line-accent: var(--signal);
}

.page-about .about-line:nth-child(3) {
  --line-accent: var(--aurora);
}

.page-about .about-line:nth-child(4) {
  --line-accent: var(--paper);
}

.page-about .about-line:hover {
  transform: translateY(-4px);
  border-color: var(--line-strong);
}

.page-about .about-line__no {
  margin: 0 0 10px;
  color: var(--line-accent);
  letter-spacing: 0.16em;
}

.page-about .about-line__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 21px;
  line-height: 1.25;
  color: var(--snow);
}

.page-about .about-line__text {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.75;
  color: var(--frost);
}

.page-about .about-line__link {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.1em;
  color: var(--line-accent);
  text-decoration: none;
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
}

.page-about .about-line__link:hover,
.page-about .about-line__link:focus-visible {
  color: var(--snow);
}

/* ---------- 团队 ---------- */
.page-about .about-team__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-team__quad {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-team__cell {
  padding: 16px 16px 18px;
  background: rgba(10, 27, 44, 0.8);
  border: 1px solid var(--line);
  clip-path: var(--about-cut-sm);
  transition: background-color 200ms ease, border-color 200ms ease;
}

.page-about .about-team__cell:hover,
.page-about .about-team__cell:focus-within {
  background: rgba(0, 245, 212, 0.1);
  border-color: var(--cyan);
}

.page-about .about-team__cell-no {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.16em;
  color: var(--signal);
}

.page-about .about-team__cell-title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  line-height: 1.3;
  color: var(--snow);
}

.page-about .about-team__cell-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.72;
  color: var(--frost);
}

.page-about .about-team__data {
  margin-top: 18px;
  padding: 18px 18px 20px;
  border-left: 3px solid var(--cyan);
  background: rgba(22, 52, 74, 0.4);
}

.page-about .about-team__data-title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 18px;
  color: var(--snow);
}

.page-about .about-team__data .prose {
  margin-bottom: 14px;
}

.page-about .about-team__chips {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.page-about .about-team__media {
  margin: 0;
  border: 1px solid var(--line-strong);
  clip-path: var(--about-cut);
  overflow: hidden;
}

/* ---------- 规模 ---------- */
.page-about .about-reach__grid {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-metric {
  padding: 16px 14px 14px;
  background: linear-gradient(170deg, rgba(22, 52, 74, 0.66), rgba(5, 10, 18, 0.9));
  border: 1px solid var(--line);
  clip-path: var(--about-cut-sm);
}

.page-about .about-metric__num {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6vw, 46px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--cyan);
}

.page-about .about-metric__unit {
  font-size: 0.46em;
  letter-spacing: 0;
  margin-left: 2px;
  color: var(--snow);
}

.page-about .about-metric__label {
  margin: 8px 0 6px;
  font-size: 14px;
  line-height: 1.6;
  color: var(--snow);
}

.page-about .about-metric__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--frost);
}

.page-about .about-metric--paper {
  background: var(--paper);
  border-color: var(--ink);
}

.page-about .about-metric--paper .about-metric__num {
  color: var(--ink);
}

.page-about .about-metric--paper .about-metric__label {
  color: var(--ink);
}

.page-about .about-metric--paper .about-metric__note {
  color: rgba(42, 26, 18, 0.68);
}

/* ---------- 节奏 ---------- */
.page-about .about-rhythm__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: stretch;
}

.page-about .about-rhythm__anchor {
  padding: 24px 22px 26px;
  background:
    linear-gradient(140deg, rgba(255, 107, 31, 0.92), rgba(255, 107, 31, 0.62) 55%, rgba(5, 10, 18, 0.9) 100%);
  clip-path: var(--about-cut);
  color: var(--night);
  display: grid;
  align-content: center;
  gap: 8px;
}

.page-about .about-rhythm__tag {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: rgba(5, 10, 18, 0.72);
}

.page-about .about-rhythm__clock {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(30px, 6.4vw, 52px);
  line-height: 1;
  letter-spacing: -0.03em;
  color: var(--night);
}

.page-about .about-rhythm__desc {
  margin: 6px 0 0;
  max-width: 40ch;
  font-size: 15px;
  line-height: 1.7;
  color: rgba(5, 10, 18, 0.82);
}

.page-about .about-rhythm__side {
  display: grid;
  gap: 12px;
  align-content: start;
}

.page-about .about-rhythm__item {
  display: grid;
  grid-template-columns: 58px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 16px 16px 18px;
  background: rgba(10, 27, 44, 0.8);
  border: 1px solid var(--line);
  border-left: 3px solid var(--aurora);
  clip-path: var(--about-cut-sm);
}

.page-about .about-rhythm__item-num {
  margin: 0;
  font-family: var(--font-display);
  font-size: 34px;
  line-height: 1;
  color: var(--aurora);
}

.page-about .about-rhythm__item-title {
  margin: 0 0 6px;
  font-size: 16px;
  line-height: 1.4;
  color: var(--snow);
}

.page-about .about-rhythm__item-text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--frost);
}

.page-about .about-rhythm__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 4px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-lines__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

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

@media (min-width: 900px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(290px, 0.85fr);
  }

  .page-about .about-ethos__grid {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }

  .page-about .about-rhythm__grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
  }

  .page-about .about-line {
    padding: 24px 24px 22px;
  }

  .page-about .about-line:nth-child(even) {
    margin-top: 22px;
  }
}

@media (min-width: 980px) {
  .page-about .about-team__grid {
    grid-template-columns: minmax(0, 1.18fr) minmax(0, 0.82fr);
  }

  .page-about .about-team__media {
    position: sticky;
    top: 96px;
  }
}

@media (min-width: 1100px) {
  .page-about .about-index {
    padding: 22px 22px 10px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__item,
  .page-about .about-line,
  .page-about .about-team__cell,
  .page-about .about-timeline__tab {
    transition: none;
  }

  .page-about .about-line:hover {
    transform: none;
  }
}
<<<PAGE_CSS_END>>>
<<<END>>>