.page-about {
  --abt-rail: #16233A;
  --abt-glow: rgba(39, 224, 208, 0.14);
  color: var(--ice);
  padding-bottom: clamp(40px, 7vw, 96px);
}

.page-about img {
  max-width: 100%;
  height: auto;
  display: block;
}

.page-about .crumb {
  padding: clamp(16px, 3vw, 28px) 0 clamp(10px, 1.8vw, 16px);
}

/* ---------- Hero ---------- */

.page-about .abt-hero {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 4vw, 40px);
  padding: clamp(14px, 2.6vw, 28px) 0 clamp(40px, 6vw, 76px);
  align-items: start;
}

.page-about .abt-kicker {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--cyan);
  text-transform: uppercase;
}

.page-about .abt-hero h1 {
  margin: 0 0 18px;
  font-family: var(--font-display);
  font-size: clamp(36px, 7vw, 74px);
  line-height: 1.05;
  letter-spacing: 0.06em;
  color: var(--paper);
  text-wrap: balance;
}

.page-about .abt-lede {
  margin: 0 0 24px;
  max-width: 40em;
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.78;
  color: var(--ice);
}

.page-about .abt-chips {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .abt-chip {
  background: var(--ink);
  padding: 12px 14px 14px;
  display: flex;
  flex-direction: column;
  gap: 5px;
  min-width: 0;
}

.page-about .abt-chip__num {
  font-family: var(--font-mono);
  font-size: clamp(18px, 2vw, 22px);
  font-weight: 600;
  letter-spacing: 0.04em;
  color: var(--orange);
  font-variant-numeric: tabular-nums;
}

.page-about .abt-chip__key {
  font-size: 12px;
  line-height: 1.45;
  letter-spacing: 0.04em;
  color: var(--mist);
}

.page-about .abt-hero__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .abt-hero__media {
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--ink);
  overflow: hidden;
}

.page-about .abt-hero__media img {
  width: 100%;
  object-fit: cover;
}

/* ---------- Media base ---------- */

.page-about .media {
  margin: 0;
  border: 1px solid var(--grid);
  background: var(--ink);
  overflow: hidden;
}

.page-about .media img {
  width: 100%;
  object-fit: cover;
}

.page-about .media__cap {
  margin: 0;
  padding: 10px 14px 12px;
  font-size: 13px;
  line-height: 1.6;
  color: var(--mist);
  border-top: 1px solid var(--grid);
}

/* ---------- Sections ---------- */

.page-about .abt-sec {
  padding: clamp(30px, 5.4vw, 66px) 0;
}

.page-about .section-head {
  margin-bottom: clamp(20px, 3vw, 34px);
  max-width: 66ch;
}

.page-about .section-head__title {
  color: var(--paper);
}

.page-about .section-head__lead {
  color: var(--mist);
}

.page-about .panel--paper {
  color: var(--ink-text);
}

/* ---------- 01 起点 ---------- */

.page-about .abt-start {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 3vw, 32px);
  padding: clamp(22px, 3.4vw, 40px);
}

.page-about .abt-start__body p {
  margin: 0 0 14px;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--ink-text);
}

.page-about .abt-start__body p:last-child {
  margin-bottom: 0;
}

.page-about .abt-start__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
  align-content: start;
}

.page-about .abt-start__list li {
  background: var(--paper-2);
  padding: 14px 16px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--ink-text);
  display: grid;
  grid-template-columns: 10px minmax(0, 1fr);
  gap: 10px;
}

.page-about .abt-start__list li::before {
  content: "";
  width: 8px;
  height: 8px;
  margin-top: 8px;
  border-radius: 50%;
  background: var(--cyan-deep);
}

.page-about .abt-start__list strong {
  color: var(--ink-text);
  font-weight: 700;
}

/* ---------- 02 版本轨道 ---------- */

.page-about .abt-versions__figure {
  margin: 0 0 clamp(24px, 3.4vw, 40px);
}

.page-about .abt-versions__figure img {
  width: 100%;
  max-height: 380px;
  object-fit: cover;
}

.page-about .abt-track {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
  display: grid;
  gap: clamp(16px, 2.4vw, 26px);
}

.page-about .abt-track::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 16px;
  bottom: 16px;
  width: 1px;
  background: linear-gradient(
    to bottom,
    var(--cyan) 0%,
    rgba(39, 224, 208, 0.35) 16%,
    var(--grid) 42%,
    var(--grid) 84%,
    rgba(39, 224, 208, 0.18) 100%
  );
}

.page-about .abt-node {
  position: relative;
  padding-left: 38px;
}

.page-about .abt-node__dot {
  position: absolute;
  left: 0;
  top: 12px;
  width: 19px;
  height: 19px;
  border-radius: 50%;
  background: var(--void);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px var(--abt-glow);
}

.page-about .abt-node__dot::after {
  content: "";
  position: absolute;
  inset: 5px;
  border-radius: 50%;
  background: var(--cyan);
}

.page-about .abt-node__card {
  background: rgba(14, 22, 38, 0.86);
  border: 1px solid var(--grid);
  border-left: 2px solid var(--cyan);
  padding: clamp(16px, 2.2vw, 24px);
  max-width: 68ch;
}

.page-about .abt-node__ver {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .abt-node__card h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.3vw, 26px);
  line-height: 1.2;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .abt-node__card p {
  margin: 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--ice);
}

.page-about .abt-node__gain {
  margin-top: 12px !important;
  font-size: 14px !important;
  color: var(--orange) !important;
  padding-left: 14px;
  position: relative;
}

.page-about .abt-node__gain::before {
  content: "";
  position: absolute;
  left: 0;
  top: 9px;
  width: 7px;
  height: 7px;
  background: var(--orange);
  transform: rotate(45deg);
}

/* ---------- 03 北方接入 ---------- */

.page-about .abt-north {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(20px, 3vw, 34px);
  padding: clamp(22px, 3.4vw, 40px);
}

.page-about .abt-north__body p {
  margin: 0 0 14px;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--ink-text);
}

.page-about .abt-north__body p:last-child {
  margin-bottom: 0;
}

.page-about .abt-coord {
  border: 1px solid var(--paper-line);
  background: var(--paper-2);
  padding: 18px;
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .abt-coord__svg {
  width: 96px;
  height: 96px;
  display: block;
  margin-bottom: 4px;
}

.page-about .abt-coord__label {
  margin: 0;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--cyan-deep);
}

.page-about .abt-coord__val {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 15px;
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--ink-text);
}

.page-about .abt-coord__note {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--ink-muted);
}

/* ---------- 04 团队 ---------- */

.page-about .abt-team {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3.4vw, 40px);
  align-items: start;
}

.page-about .abt-team__figure {
  margin: 0;
}

.page-about .abt-team__figure img {
  width: 100%;
  max-height: 420px;
  object-fit: cover;
}

.page-about .abt-tabs .tabs__list {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  border-bottom: 1px solid var(--grid);
  position: relative;
}

.page-about .abt-tabs .tabs__tab {
  appearance: none;
  background: transparent;
  border: 1px solid transparent;
  color: var(--mist);
  font-family: var(--font-body);
  font-size: 14px;
  letter-spacing: 0.04em;
  padding: 10px 14px;
  cursor: pointer;
  transition: color 0.2s var(--ease), border-color 0.2s var(--ease);
}

.page-about .abt-tabs .tabs__tab:hover {
  color: var(--ice);
  border-color: var(--grid);
}

.page-about .abt-tabs .tabs__tab[aria-selected="true"] {
  color: var(--paper);
  border-color: var(--grid);
  background: rgba(14, 22, 38, 0.7);
}

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

.page-about .abt-tabs .tabs__panel {
  padding: clamp(18px, 2.4vw, 26px) 0 0;
}

.page-about .abt-tabs .tabs__panel[hidden] {
  display: none;
}

.page-about .abt-tabs__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.2vw, 25px);
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .abt-tabs .tabs__panel > p {
  margin: 0 0 14px;
  max-width: 44em;
  font-size: 15.5px;
  line-height: 1.78;
  color: var(--ice);
}

.page-about .abt-tabs__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--grid);
  border: 1px solid var(--grid);
}

.page-about .abt-tabs__list li {
  background: var(--ink);
  padding: 11px 14px;
  font-size: 14.5px;
  line-height: 1.65;
  color: var(--ice);
}

/* ---------- 05 周更节奏 ---------- */

.page-about .abt-rhythm {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--paper-line);
  border: 1px solid var(--paper-line);
}

.page-about .abt-rhythm__col {
  background: var(--paper);
  padding: clamp(20px, 2.8vw, 30px);
  display: grid;
  gap: 8px;
  align-content: start;
}

.page-about .abt-rhythm__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(24px, 3vw, 32px);
  font-weight: 600;
  letter-spacing: 0.02em;
  color: var(--orange-deep);
  font-variant-numeric: tabular-nums;
}

.page-about .abt-rhythm__col h3 {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 1.9vw, 21px);
  letter-spacing: 0.05em;
  color: var(--ink-text);
}

.page-about .abt-rhythm__col p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.72;
  color: var(--ink-muted);
}

.page-about .abt-rhythm__col .tag {
  justify-self: start;
  margin-top: 4px;
}

/* ---------- 06 展望 ---------- */

.page-about .abt-next {
  padding: clamp(22px, 3.2vw, 38px);
  background: var(--ink);
  border: 1px solid var(--grid);
}

.page-about .abt-next__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(18px, 2.6vw, 30px);
}

.page-about .abt-next__list li {
  padding-left: 16px;
  border-left: 1px solid var(--grid);
}

.page-about .abt-next__key {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--orange);
}

.page-about .abt-next__list h3 {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.1vw, 23px);
  line-height: 1.22;
  letter-spacing: 0.05em;
  color: var(--paper);
}

.page-about .abt-next__list p {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--ice);
}

/* ---------- Outro ---------- */

.page-about .abt-outro {
  margin-top: clamp(28px, 5vw, 60px);
  padding: clamp(26px, 4vw, 48px);
  border: 1px solid var(--grid);
  background:
    radial-gradient(circle at 88% 12%, rgba(255, 61, 139, 0.13), transparent 46%),
    radial-gradient(circle at 6% 92%, rgba(39, 224, 208, 0.16), transparent 52%),
    var(--ink);
}

.page-about .abt-outro__title {
  margin: 0 0 12px;
  font-family: var(--font-display);
  font-size: clamp(22px, 3.2vw, 38px);
  line-height: 1.15;
  letter-spacing: 0.05em;
  color: var(--paper);
  max-width: 24ch;
}

.page-about .abt-outro__text {
  margin: 0 0 22px;
  max-width: 46em;
  font-size: clamp(15.5px, 1.5vw, 17px);
  line-height: 1.78;
  color: var(--ice);
}

.page-about .abt-outro__acts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- Responsive ---------- */

@media (min-width: 640px) {
  .page-about .abt-chips {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

@media (min-width: 900px) {
  .page-about .abt-hero {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
    gap: clamp(30px, 4vw, 58px);
    align-items: center;
  }

  .page-about .abt-start {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
  }

  .page-about .abt-north {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
  }

  .page-about .abt-team {
    grid-template-columns: minmax(0, 5fr) minmax(0, 7fr);
  }

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

@media (min-width: 1080px) {
  .page-about .abt-node__card {
    padding-right: clamp(24px, 3vw, 40px);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .abt-tabs .tabs__tab {
    transition: none;
  }
}
<<<END>>>