.page-about {
  --about-gap: 20px;
  padding-bottom: 56px;
}

.page-about .about-top {
  padding-top: 26px;
}

.page-about .about-hero {
  display: grid;
  gap: 26px;
  padding: 18px 0 10px;
}

.page-about h1 {
  font-family: var(--font-display);
  font-size: clamp(29px, 5.2vw, 54px);
  line-height: 1.12;
  letter-spacing: -0.02em;
  color: var(--snow);
  margin: 14px 0 0;
}

.page-about .about-hero__lede {
  margin: 18px 0 0;
  max-width: 62ch;
  color: var(--mist);
  font-size: 16.5px;
  line-height: 1.85;
}

.page-about .about-quick {
  display: grid;
  gap: 1px;
  background: var(--line-soft);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-quick__cell {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 18px;
  background: rgba(11, 43, 51, 0.78);
}

.page-about .about-quick__num {
  font-family: var(--font-mono);
  font-size: 26px;
  font-weight: 700;
  color: var(--lime);
  line-height: 1;
}

.page-about .about-quick__label {
  color: var(--mist);
  font-size: 13.5px;
  line-height: 1.6;
}

/* 章节索引 */
.page-about .about-shell {
  display: grid;
  gap: 8px;
  margin-top: 22px;
}

.page-about .about-index {
  border-top: 1px solid var(--line-soft);
  border-bottom: 1px solid var(--line-soft);
  padding: 12px 0 8px;
}

.page-about .about-index__title {
  margin: 0 0 8px;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--mist);
}

.page-about .about-index__list {
  display: flex;
  gap: 8px;
  margin: 0;
  padding: 0 0 6px;
  list-style: none;
  overflow-x: auto;
  scrollbar-width: thin;
}

.page-about .about-index__link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  padding: 8px 13px;
  border: 1px solid var(--line-soft);
  border-radius: 999px;
  color: var(--mist);
  font-size: 13px;
  text-decoration: none;
  white-space: nowrap;
  transition: color 0.2s ease, border-color 0.2s ease, background 0.2s ease;
}

.page-about .about-index__link:hover,
.page-about .about-index__link:focus-visible {
  color: var(--snow);
  border-color: var(--lime);
  background: rgba(200, 255, 61, 0.08);
}

.page-about .about-index__num {
  font-family: var(--font-mono);
  font-size: 11.5px;
  color: var(--mint);
}

/* 章节 */
.page-about .about-section {
  padding: 40px 0 12px;
  border-top: 1px solid var(--line-soft);
  scroll-margin-top: calc(var(--bar-h) + 24px);
}

.page-about .about-section:first-child {
  border-top: 0;
  padding-top: 26px;
}

.page-about .section-title {
  font-family: var(--font-display);
  font-size: clamp(23px, 3.4vw, 36px);
  line-height: 1.22;
  letter-spacing: -0.01em;
  color: var(--snow);
  margin: 10px 0 0;
}

.page-about .lede {
  margin: 14px 0 0;
  max-width: 64ch;
  color: var(--mist);
  font-size: 15.5px;
  line-height: 1.8;
}

.page-about .body-p {
  margin: 18px 0 0;
  max-width: 70ch;
  color: var(--snow);
  opacity: 0.9;
  font-size: 15.5px;
  line-height: 1.88;
}

/* 能力点 */
.page-about .about-points {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-point {
  padding: 18px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(18, 61, 74, 0.55), rgba(11, 43, 51, 0.34));
}

.page-about .about-point__k {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.page-about .about-point__t {
  margin: 8px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-point p {
  margin: 7px 0 0;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.72;
}

/* 流程 */
.page-about .about-flow-wrap {
  margin-top: 26px;
  padding: 20px 16px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 43, 51, 0.52);
  overflow-x: auto;
}

.page-about .about-flow {
  display: block;
  width: 100%;
  min-width: 540px;
  height: auto;
}

.page-about .about-flow__step {
  font-family: var(--font-mono);
  font-size: 14px;
  letter-spacing: 0.1em;
  fill: var(--mint);
}

.page-about .about-flow__name {
  font-family: var(--font-body);
  font-size: 20px;
  font-weight: 700;
  fill: var(--snow);
}

.page-about .about-flow__desc {
  font-family: var(--font-mono);
  font-size: 13px;
  fill: var(--mist);
}

.page-about .about-flow-grid {
  margin-top: 24px;
  gap: 22px;
}

.page-about .about-figure {
  margin-top: 22px;
}

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

.page-about .about-figure--band {
  margin-top: 24px;
}

.page-about .about-quote {
  margin: 24px 0 0;
  padding: 18px 20px;
  border-left: 3px solid var(--orange);
  border-radius: 0 var(--radius) var(--radius) 0;
  background: var(--glass);
  backdrop-filter: blur(6px);
  color: var(--snow);
  font-size: 15.5px;
  line-height: 1.8;
}

/* 规模数字 */
.page-about .about-stats {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-stat {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 34, 58, 0.6);
}

.page-about .about-stat__num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(44px, 9vw, 72px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--lime);
}

.page-about .about-stat .stat__label {
  display: block;
  margin-top: 12px;
  color: var(--mist);
  font-size: 13px;
  line-height: 1.7;
}

/* 团队 */
.page-about .about-team {
  display: grid;
  gap: 14px;
  margin-top: 26px;
}

.page-about .about-team__item {
  padding: 18px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(14, 34, 58, 0.55);
}

.page-about .about-team__num {
  font-family: var(--font-mono);
  font-size: 32px;
  font-weight: 700;
  line-height: 1;
  color: var(--snow);
}

.page-about .about-team__t {
  margin: 10px 0 0;
  font-size: 15.5px;
  font-weight: 700;
  color: var(--lime);
}

.page-about .about-team__item p {
  margin: 7px 0 0;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.7;
}

/* 时间轴 */
.page-about .about-timeline {
  display: grid;
  gap: 14px;
  margin-top: 26px;
  position: relative;
}

.page-about .about-timeline .accordion__item {
  position: relative;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: rgba(11, 43, 51, 0.66);
  overflow: hidden;
}

.page-about .about-timeline .accordion__trigger {
  display: block;
  width: 100%;
  padding: 18px 18px 16px;
  border: 0;
  background: none;
  color: var(--snow);
  font: inherit;
  text-align: left;
  cursor: pointer;
}

.page-about .about-timeline .accordion__trigger::before {
  content: "";
  display: block;
  width: 10px;
  height: 10px;
  margin-bottom: 12px;
  border-radius: 50%;
  background: var(--orange);
  box-shadow: 0 0 0 4px rgba(255, 138, 61, 0.18);
  transition: background 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-timeline .accordion__trigger[aria-expanded="true"]::before {
  background: var(--lime);
  box-shadow: 0 0 0 4px rgba(200, 255, 61, 0.2);
}

.page-about .about-timeline .accordion__trigger:focus-visible {
  outline: 2px solid var(--lime);
  outline-offset: -4px;
}

.page-about .about-timeline__year {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--mint);
}

.page-about .about-timeline__t {
  display: block;
  margin-top: 6px;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-timeline .accordion__panel-inner {
  padding: 14px 18px 18px;
  border-top: 1px solid var(--line-soft);
  color: var(--mist);
  font-size: 14px;
  line-height: 1.76;
}

.page-about .about-timeline .accordion__panel[hidden] {
  display: none;
}

/* 合作与安全 */
.page-about .about-trust-grid {
  margin-top: 24px;
  gap: 22px;
}

.page-about .about-trust-card {
  padding: 20px;
  align-self: start;
  border-radius: var(--radius);
}

.page-about .about-trust-card__k {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--amber);
}

.page-about .about-trust-card__t {
  margin: 10px 0 0;
  font-size: 16px;
  font-weight: 700;
  color: var(--snow);
}

.page-about .about-trust-card__d {
  margin: 8px 0 16px;
  color: var(--mist);
  font-size: 14px;
  line-height: 1.75;
}

/* 收尾入口 */
.page-about .about-cta {
  margin-top: 44px;
  padding: 26px 22px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background:
    radial-gradient(120% 140% at 0% 0%, rgba(200, 255, 61, 0.12), transparent 55%),
    linear-gradient(150deg, rgba(14, 34, 58, 0.92), rgba(6, 26, 33, 0.92));
}

.page-about .about-cta__title {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(20px, 3vw, 27px);
  line-height: 1.3;
  color: var(--snow);
}

.page-about .about-cta__d {
  margin: 10px 0 0;
  color: var(--mist);
  font-size: 14.5px;
  line-height: 1.75;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 20px;
}

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

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

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

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

@media (min-width: 900px) {
  .page-about .about-hero {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 0.85fr);
    gap: 48px;
    align-items: end;
    padding-bottom: 18px;
  }

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

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

@media (min-width: 1000px) {
  .page-about .about-shell {
    grid-template-columns: 196px minmax(0, 1fr);
    gap: 56px;
    margin-top: 32px;
  }

  .page-about .about-index {
    position: sticky;
    top: calc(var(--bar-h) + 28px);
    align-self: start;
    border: 0;
    border-left: 1px solid var(--line-soft);
    padding: 0 0 0 4px;
  }

  .page-about .about-index__list {
    flex-direction: column;
    overflow: visible;
    gap: 2px;
    padding-bottom: 0;
  }

  .page-about .about-index__link {
    border: 0;
    border-left: 2px solid transparent;
    border-radius: 0;
    padding: 9px 12px;
    font-size: 13.5px;
    white-space: normal;
  }

  .page-about .about-index__link:hover,
  .page-about .about-index__link:focus-visible {
    border-left-color: var(--lime);
    background: rgba(200, 255, 61, 0.06);
  }

  .page-about .about-section {
    padding: 48px 0 14px;
  }
}

@media (min-width: 1120px) {
  .page-about .about-timeline {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .about-timeline::before {
    content: "";
    position: absolute;
    top: 32px;
    left: 12px;
    right: 12px;
    height: 2px;
    background: linear-gradient(90deg, var(--orange), var(--lime) 55%, var(--mint));
    opacity: 0.32;
    pointer-events: none;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-index__link,
  .page-about .about-timeline .accordion__trigger::before {
    transition: none;
  }
}
<<<END>>>