.page-about {
  --about-side-w: 210px;
  --about-gap: clamp(20px, 3vw, 48px);
  background: var(--c-void);
  color: var(--c-white);
  font-family: var(--font-body);
  overflow-wrap: break-word;
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(24px, 4vw, 44px) 0 clamp(36px, 5vw, 64px);
  background:
    radial-gradient(90% 130% at 88% -20%, rgba(255, 106, 26, 0.18), transparent 62%),
    radial-gradient(70% 90% at 0% 8%, rgba(24, 224, 200, 0.1), transparent 58%),
    linear-gradient(180deg, var(--c-deep) 0%, var(--c-void) 86%);
  border-bottom: 1px solid var(--line);
}

.page-about .breadcrumb-item {
  display: inline-flex;
  align-items: center;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.04em;
  color: var(--c-mute);
}

.page-about .breadcrumb-item + .breadcrumb-item::before {
  content: "/";
  margin: 0 8px;
  color: var(--line-strong);
}

.page-about .breadcrumb-current {
  color: var(--c-amber);
}

.page-about .about-hero__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(24px, 4vw, 52px);
  margin-top: clamp(22px, 3vw, 36px);
  align-items: start;
}

.page-about .about-hero .display-title {
  margin: 14px 0 0;
  line-height: 1.06;
  letter-spacing: -0.04em;
}

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

.page-about .about-hero .lead {
  max-width: 62ch;
  margin-top: 20px;
  color: var(--c-mute);
}

.page-about .about-hero__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 26px;
}

.page-about .about-hero__panel {
  border: 1px solid var(--line);
  border-left: 2px solid var(--line-orange);
  border-radius: var(--r-md);
  background:
    linear-gradient(150deg, rgba(21, 29, 43, 0.92), rgba(14, 20, 32, 0.7));
  box-shadow: var(--shadow-soft);
  padding: 18px 18px 8px;
}

.page-about .about-panel__title {
  margin: 0 0 12px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-cyan);
}

.page-about .about-panel__list {
  margin: 0;
  padding: 0;
}

.page-about .about-panel__row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 12px;
  padding: 10px 0;
  border-top: 1px solid var(--line);
}

.page-about .about-panel__row dt {
  font-size: 13px;
  color: var(--c-mute);
}

.page-about .about-panel__row dd {
  margin: 0;
  font-size: 14px;
  color: var(--c-white);
}

.page-about .about-panel__row:nth-child(2) dd,
.page-about .about-panel__row:nth-child(3) dd {
  color: var(--c-amber);
}

.page-about .about-metrics {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(28px, 4vw, 44px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-metrics__item {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 14px;
  background: var(--c-deep);
}

.page-about .about-metrics__num {
  font-family: var(--font-mono);
  font-size: clamp(26px, 5vw, 38px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--c-orange);
}

.page-about .about-metrics__unit {
  margin-left: 3px;
  font-size: 0.5em;
  color: var(--c-amber);
}

.page-about .about-metrics__label {
  font-size: 12px;
  line-height: 1.5;
  color: var(--c-mute);
}

/* ---------- 章节骨架 ---------- */
.page-about .about-chapter {
  padding: clamp(44px, 6vw, 88px) 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-chapter--indigo {
  background:
    radial-gradient(110% 90% at 100% 0%, rgba(61, 217, 255, 0.08), transparent 62%),
    linear-gradient(180deg, rgba(30, 16, 64, 0.92), rgba(30, 16, 64, 0.5));
}

.page-about .about-chapter--teal {
  background:
    radial-gradient(110% 90% at 0% 0%, rgba(24, 224, 200, 0.1), transparent 60%),
    linear-gradient(180deg, rgba(6, 42, 46, 0.92), rgba(6, 42, 46, 0.45));
}

.page-about .about-chapter--graphite {
  background:
    radial-gradient(120% 100% at 80% 0%, rgba(255, 106, 26, 0.08), transparent 62%),
    linear-gradient(180deg, var(--c-graphite), var(--c-deep));
}

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

.page-about .about-chapter__side {
  display: flex;
  align-items: center;
  gap: 12px;
}

.page-about .about-chapter__num {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.03em;
  color: transparent;
  -webkit-text-stroke: 1px var(--line-strong);
}

.page-about .about-chapter__kicker {
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--c-amber);
  border-left: 1px solid var(--line-orange);
  padding-left: 12px;
}

.page-about .about-chapter__body .section-title {
  margin: 0 0 20px;
  line-height: 1.16;
  letter-spacing: -0.03em;
}

.page-about .about-chapter__body .prose {
  max-width: 66ch;
  color: rgba(242, 245, 248, 0.82);
}

.page-about .about-chapter__body .prose p {
  margin: 0 0 16px;
}

.page-about .about-chapter__body .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-subtitle {
  margin: 34px 0 14px;
  font-size: 16px;
  letter-spacing: 0.02em;
  color: var(--c-white);
  padding-bottom: 10px;
  border-bottom: 1px solid var(--line);
}

/* ---------- 图文错位 ---------- */
.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  align-items: start;
}

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

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  object-fit: cover;
  border-radius: var(--r-md);
}

.page-about .media-frame {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  overflow: hidden;
  background: var(--surface-solid);
}

.page-about .media-frame__tag {
  position: absolute;
  left: 12px;
  bottom: 12px;
  padding: 4px 10px;
  border: 1px solid var(--line-orange);
  border-radius: var(--r-sm);
  background: rgba(7, 10, 15, 0.82);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--c-amber);
}

/* ---------- 能力条目 ---------- */
.page-about .about-capabilities {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-capabilities__item {
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--line-cyan);
  border-radius: var(--r-sm);
  background: var(--surface);
}

.page-about .about-capabilities__title {
  margin: 0 0 8px;
  font-size: 15px;
  letter-spacing: 0.01em;
  color: var(--c-white);
}

.page-about .about-capabilities__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mute);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline {
  margin: 26px 0 0;
  padding: 0 0 0 20px;
  list-style: none;
  border-left: 1px solid var(--line-strong);
}

.page-about .about-timeline__item {
  position: relative;
  padding: 0 0 clamp(24px, 3vw, 34px) 8px;
}

.page-about .about-timeline__item:last-child {
  padding-bottom: 0;
}

.page-about .about-timeline__item::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 8px;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-orange);
  box-shadow: 0 0 0 4px rgba(255, 106, 26, 0.14);
}

.page-about .about-timeline__year {
  display: block;
  font-size: 22px;
  font-weight: 700;
  letter-spacing: 0.04em;
  color: var(--c-cyan);
}

.page-about .about-timeline__title {
  margin: 6px 0 6px;
  font-size: 15px;
  color: var(--c-white);
}

.page-about .about-timeline__text {
  margin: 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-mute);
}

.page-about .about-history-figure {
  margin-top: clamp(24px, 4vw, 36px);
}

/* ---------- 版本卡与表格 ---------- */
.page-about .about-release-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 24px 0 0;
}

.page-about .about-release-card {
  padding: 16px 16px 18px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: var(--surface);
}

.page-about .about-release-card__label {
  margin: 0 0 8px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--c-mute);
}

.page-about .about-release-card__value {
  margin: 0 0 8px;
  font-size: clamp(17px, 3.4vw, 22px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--c-amber);
}

.page-about .about-release-card.card--accent {
  border-color: var(--line-cyan);
}

.page-about .about-release-card.card--accent .about-release-card__value {
  color: var(--c-cyan);
}

.page-about .about-release-card__note {
  margin: 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--c-mute);
}

.page-about .about-table-wrap {
  overflow-x: auto;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: rgba(14, 20, 32, 0.6);
}

.page-about .about-table {
  width: 100%;
  min-width: 540px;
  border-collapse: collapse;
  font-size: 13.5px;
}

.page-about .about-table__caption {
  padding: 12px 14px;
  text-align: left;
  font-size: 12.5px;
  line-height: 1.6;
  color: var(--c-mute);
  border-bottom: 1px solid var(--line);
}

.page-about .about-table th,
.page-about .about-table td {
  padding: 12px 14px;
  text-align: left;
  border-bottom: 1px solid var(--line);
  vertical-align: top;
}

.page-about .about-table thead th {
  font-size: 11.5px;
  letter-spacing: 0.12em;
  color: var(--c-amber);
  background: rgba(255, 106, 26, 0.06);
}

.page-about .about-table tbody td {
  color: rgba(242, 245, 248, 0.84);
}

.page-about .about-table tbody tr:last-child td {
  border-bottom: none;
}

.page-about .about-table .mono {
  color: var(--c-blue);
}

/* ---------- 团队 ---------- */
.page-about .about-teams {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 0;
  list-style: none;
}

.page-about .about-teams__card {
  padding: 16px;
  border: 1px solid var(--line);
  border-radius: var(--r-sm);
  background: linear-gradient(160deg, rgba(21, 29, 43, 0.9), rgba(14, 20, 32, 0.66));
}

.page-about .about-teams__code {
  display: inline-block;
  margin-bottom: 8px;
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--c-cyan);
}

.page-about .about-teams__name {
  margin: 0 0 8px;
  font-size: 16px;
  color: var(--c-white);
}

.page-about .about-teams__desc {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-mute);
}

.page-about .about-sla {
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  list-style: none;
  border-top: 1px solid var(--line);
}

.page-about .about-sla__row {
  display: grid;
  grid-template-columns: 44px 92px 1fr;
  align-items: baseline;
  gap: 10px;
  padding: 14px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-sla__level {
  font-size: 14px;
  font-weight: 700;
  color: var(--c-orange);
}

.page-about .about-sla__time {
  font-size: 13px;
  color: var(--c-amber);
}

.page-about .about-sla__desc {
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--c-mute);
}

/* ---------- 覆盖图例 ---------- */
.page-about .about-legend {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  margin: clamp(24px, 4vw, 36px) 0 0;
  padding: 0;
  list-style: none;
  border: 1px solid var(--line);
  border-radius: var(--r-md);
  background: var(--line);
  overflow: hidden;
}

.page-about .about-legend__item {
  display: grid;
  grid-template-columns: 10px 1fr auto;
  align-items: center;
  gap: 12px;
  padding: 14px 16px;
  background: rgba(14, 20, 32, 0.92);
}

.page-about .about-legend__dot {
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--c-mute);
}

.page-about .about-legend__dot--cyan {
  background: var(--c-cyan);
  box-shadow: 0 0 0 3px rgba(24, 224, 200, 0.16);
}

.page-about .about-legend__dot--blue {
  background: var(--c-blue);
  box-shadow: 0 0 0 3px rgba(61, 217, 255, 0.16);
}

.page-about .about-legend__dot--amber {
  background: var(--c-amber);
  box-shadow: 0 0 0 3px rgba(255, 177, 92, 0.16);
}

.page-about .about-legend__dot--orange {
  background: var(--c-orange);
  box-shadow: 0 0 0 3px rgba(255, 106, 26, 0.16);
}

.page-about .about-legend__name {
  font-size: 13.5px;
  color: rgba(242, 245, 248, 0.86);
}

.page-about .about-legend__val {
  font-size: 18px;
  font-weight: 700;
  color: var(--c-white);
}

/* ---------- 合作 ---------- */
.page-about .about-coop__grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
}

.page-about .about-coop__item {
  padding: 14px 16px;
  border-left: 2px solid var(--line-cyan);
  background: rgba(7, 10, 15, 0.45);
  border-radius: 0 var(--r-sm) var(--r-sm) 0;
}

.page-about .about-coop__title {
  margin: 0 0 6px;
  font-size: 14.5px;
  font-weight: 700;
  color: var(--c-white);
}

.page-about .about-coop__text {
  margin: 0;
  font-size: 13.5px;
  line-height: 1.7;
  color: var(--c-mute);
}

.page-about .about-coop__link {
  margin-top: 18px;
}

/* ---------- 收束 ---------- */
.page-about .about-final {
  margin: clamp(26px, 4vw, 38px) 0 0;
  padding: 1px;
  border-radius: var(--r-md);
  background: linear-gradient(120deg, rgba(255, 106, 26, 0.5), rgba(24, 224, 200, 0.35));
}

.page-about .about-final__inner {
  padding: clamp(20px, 3.4vw, 30px);
  border-radius: calc(var(--r-md) - 1px);
  background: linear-gradient(150deg, var(--c-deep), var(--c-void));
}

.page-about .about-final__eyebrow {
  margin: 0 0 10px;
  font-size: 11px;
  letter-spacing: 0.24em;
  color: var(--c-cyan);
}

.page-about .about-final__text {
  margin: 0;
  max-width: 56ch;
  font-size: 15px;
  line-height: 1.75;
  color: rgba(242, 245, 248, 0.9);
}

.page-about .about-final__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 18px;
}

.page-about .about-contact {
  margin-top: clamp(24px, 4vw, 34px);
  padding-top: 20px;
  border-top: 1px solid var(--line);
}

.page-about .about-contact__row {
  display: flex;
  flex-wrap: wrap;
  gap: 6px 14px;
  padding: 9px 0;
  border-bottom: 1px solid var(--line);
}

.page-about .about-contact__key {
  flex: 0 0 84px;
  font-size: 12px;
  letter-spacing: 0.08em;
  color: var(--c-mute);
}

.page-about .about-contact__val {
  font-size: 13.5px;
  color: var(--c-white);
  word-break: break-all;
}

.page-about .about-note {
  margin: 16px 0 0;
  max-width: 62ch;
  font-size: 12.5px;
  line-height: 1.75;
  color: var(--c-mute);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-metrics {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-br {
    display: inline;
  }

  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.45fr) minmax(280px, 0.8fr);
    align-items: center;
  }

  .page-about .about-hero__panel {
    align-self: stretch;
  }

  .page-about .about-chapter__inner {
    grid-template-columns: var(--about-side-w) minmax(0, 1fr);
  }

  .page-about .about-chapter__side {
    position: sticky;
    top: 96px;
    flex-direction: column;
    align-items: flex-start;
    gap: 10px;
  }

  .page-about .about-chapter__kicker {
    border-left: none;
    padding-left: 0;
    border-top: 1px solid var(--line-orange);
    padding-top: 10px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
    gap: clamp(28px, 3.5vw, 52px);
  }

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

  .page-about .about-split--reverse .about-split__figure {
    order: -1;
  }

  .page-about .about-timeline {
    padding-left: 26px;
  }

  .page-about .about-timeline__item {
    padding-left: 16px;
  }

  .page-about .about-timeline__item::before {
    left: -31px;
  }

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

  .page-about .about-teams {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (min-width: 1180px) {
  .page-about .about-hero .display-title {
    font-size: clamp(52px, 5vw, 74px);
  }

  .page-about .about-release-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-timeline__item::before {
    box-shadow: none;
  }
}
<<<END>>>