.page-about {
  --about-pad: clamp(56px, 9vw, 116px);
  --about-gap: clamp(16px, 2.4vw, 28px);
  display: block;
}

.page-about .shell {
  padding-left: 20px;
  padding-right: 20px;
}

/* ---------- 01 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(20px, 4vw, 44px) 0 clamp(48px, 8vw, 104px);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -18%;
  right: -22%;
  width: min(560px, 78vw);
  aspect-ratio: 1 / 1;
  border-radius: 46% 54% 38% 62% / 58% 42% 58% 42%;
  background: radial-gradient(circle at 38% 38%, rgba(11, 58, 68, .92), rgba(6, 23, 38, 0) 68%);
  pointer-events: none;
  z-index: 0;
}

.page-about .about-hero__inner {
  position: relative;
  z-index: 1;
  display: grid;
  gap: clamp(32px, 6vw, 56px);
}

.page-about .about-hero__index {
  display: flex;
  align-items: baseline;
  gap: 14px;
  margin: 0 0 clamp(18px, 3vw, 28px);
}

.page-about .about-hero__index-num {
  font-size: clamp(48px, 12vw, 112px);
  font-weight: 200;
  line-height: .8;
  letter-spacing: -.02em;
  color: var(--cyan);
}

.page-about .about-hero__index-label {
  font-size: 12px;
  letter-spacing: .22em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .about-hero__title {
  margin: 0 0 clamp(18px, 3vw, 26px);
  font-family: var(--font-display);
  font-size: clamp(34px, 8.6vw, 78px);
  font-weight: 250;
  line-height: 1.12;
  letter-spacing: -.02em;
  color: var(--text);
}

.page-about .about-hero__text {
  max-width: 46ch;
  margin: 0 0 clamp(24px, 4vw, 36px);
  font-size: clamp(16px, 1.5vw, 18px);
  line-height: 1.8;
  color: var(--text-soft);
}

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

.page-about .about-hero__panel {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(13, 35, 55, .96), rgba(11, 58, 68, .5));
  padding: clamp(20px, 3.4vw, 30px);
}

.page-about .about-hero__panel-title {
  margin: 0 0 18px;
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--muted);
}

.page-about .hero-facts {
  margin: 0;
  display: grid;
  gap: 0;
}

.page-about .hero-facts__row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 12px 0;
  border-bottom: 1px solid var(--border);
}

.page-about .hero-facts__row:last-child {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .hero-facts__key {
  margin: 0;
  font-size: 14px;
  color: var(--muted);
}

.page-about .hero-facts__val {
  margin: 0;
  font-size: 18px;
  color: var(--text);
}

/* ---------- 通用章节骨架 ---------- */

.page-about .about-section {
  padding: var(--about-pad) 0;
  border-top: 1px solid var(--border);
}

.page-about .about-head {
  max-width: 68ch;
  margin-bottom: clamp(32px, 5vw, 56px);
}

.page-about .about-head__index {
  margin: 0 0 14px;
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .about-head__title {
  margin: 0 0 16px;
  font-family: var(--font-display);
  font-size: clamp(26px, 5.2vw, 44px);
  font-weight: 300;
  line-height: 1.24;
  letter-spacing: -.01em;
  color: var(--text);
}

.page-about .about-head__lead {
  margin: 0;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-text {
  max-width: 60ch;
  margin: 0 0 18px;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-text--tight {
  margin-top: 8px;
}

.page-about .about-figure {
  margin: 0 0 clamp(32px, 5vw, 52px);
}

.page-about .about-figure .media-frame {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

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

.page-about .about-figure .media-frame__caption {
  display: block;
  margin-top: 12px;
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--muted);
}

/* ---------- 02 服务定位 ---------- */

.page-about .about-split {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .about-split__side {
  display: grid;
  gap: 16px;
  align-content: start;
}

.page-about .path-line {
  display: block;
  position: relative;
  padding: 24px 22px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  text-decoration: none;
  overflow: hidden;
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .path-line::before {
  content: "";
  position: absolute;
  inset: 0 0 auto 0;
  height: 3px;
}

.page-about .path-line--query::before {
  background: var(--violet);
}

.page-about .path-line--profile::before {
  background: var(--mint);
}

.page-about .path-line:hover,
.page-about .path-line:focus-visible {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .path-line__title {
  margin: 14px 0 10px;
  font-family: var(--font-display);
  font-size: 20px;
  font-weight: 400;
  line-height: 1.4;
  color: var(--text);
}

.page-about .path-line__text {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.7;
  color: var(--muted);
}

.page-about .path-line__more {
  font-size: 12px;
  letter-spacing: .08em;
  color: var(--cyan);
}

/* ---------- 03 发展历程 ---------- */

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0 0 0 30px;
  position: relative;
  display: grid;
  gap: clamp(24px, 3.6vw, 40px);
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 10px;
  bottom: 10px;
  width: 1px;
  background: linear-gradient(to bottom, var(--cyan), var(--border) 70%);
}

.page-about .timeline__item {
  position: relative;
  display: grid;
  gap: 6px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -30px;
  top: 7px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--ink);
  border: 1px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(31, 227, 210, .1);
}

.page-about .timeline__item--current::before {
  background: var(--cyan);
  box-shadow: 0 0 0 5px rgba(31, 227, 210, .18);
}

.page-about .timeline__num {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--muted);
}

.page-about .timeline__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(18px, 2.4vw, 22px);
  font-weight: 400;
  line-height: 1.4;
  color: var(--text);
}

.page-about .timeline__text {
  max-width: 62ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 04 团队构成 ---------- */

.page-about .team-accordion {
  display: grid;
  gap: clamp(14px, 2vw, 22px);
}

.page-about .team-card {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  overflow: hidden;
  position: relative;
  transition: border-color .24s var(--ease);
}

.page-about .team-card::before {
  content: "";
  position: absolute;
  inset: 0 auto 0 0;
  width: 3px;
}

.page-about .team-card--docs::before {
  background: var(--cyan);
}

.page-about .team-card--support::before {
  background: var(--coral);
}

.page-about .team-card--trust::before {
  background: var(--amber);
}

.page-about .team-card[data-open="true"] {
  border-color: rgba(31, 227, 210, .45);
}

.page-about .team-card__head {
  margin: 0;
  font-size: inherit;
  font-weight: inherit;
}

.page-about .team-card__trigger {
  display: flex;
  align-items: center;
  gap: clamp(14px, 2.2vw, 22px);
  width: 100%;
  padding: clamp(18px, 3vw, 26px) clamp(18px, 3vw, 28px);
  background: none;
  border: 0;
  text-align: left;
  cursor: pointer;
  color: inherit;
  font: inherit;
}

.page-about .team-card__count {
  flex: 0 0 auto;
  font-size: clamp(30px, 6vw, 46px);
  font-weight: 200;
  line-height: 1;
  color: var(--text);
  letter-spacing: -.02em;
}

.page-about .team-card__label {
  display: grid;
  gap: 4px;
  flex: 1 1 auto;
  min-width: 0;
}

.page-about .team-card__name {
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 20px);
  font-weight: 500;
  color: var(--text);
}

.page-about .team-card__role {
  font-size: 13px;
  line-height: 1.5;
  color: var(--muted);
}

.page-about .team-card__chev {
  flex: 0 0 auto;
  width: 12px;
  height: 12px;
  border-right: 1.5px solid var(--muted);
  border-bottom: 1.5px solid var(--muted);
  transform: rotate(45deg);
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .team-card[data-open="true"] .team-card__chev {
  transform: rotate(-135deg);
  border-color: var(--cyan);
}

.page-about .team-card .accordion__panel-inner {
  padding: 0 clamp(18px, 3vw, 28px) clamp(20px, 3vw, 28px);
}

.page-about .team-card__text {
  max-width: 64ch;
  margin: 0 0 12px;
  font-size: 15px;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .team-card__text:last-child {
  margin-bottom: 0;
}

/* ---------- 05 文档运营 ---------- */

.page-about .cycle {
  list-style: none;
  margin: 0 0 clamp(32px, 5vw, 52px);
  padding: 0;
  display: grid;
  gap: 16px;
  counter-reset: cycle;
}

.page-about .cycle__step {
  position: relative;
  padding: 22px 22px 22px 26px;
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
}

.page-about .cycle__step--mark {
  border-color: rgba(255, 196, 107, .42);
  background: linear-gradient(150deg, rgba(255, 196, 107, .09), rgba(13, 35, 55, .96) 60%);
}

.page-about .cycle__num {
  display: block;
  margin-bottom: 10px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--amber);
}

.page-about .cycle__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 500;
  color: var(--text);
}

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

/* ---------- 06 用户分布 ---------- */

.page-about .coverage {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

.page-about .coverage__visual {
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(160deg, rgba(11, 58, 68, .55), rgba(13, 35, 55, .9));
  padding: clamp(22px, 3.6vw, 34px);
}

.page-about .coverage__grid {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  gap: clamp(8px, 1.4vw, 14px);
}

.page-about .coverage__dot {
  display: block;
  aspect-ratio: 1 / 1;
  border-radius: 50%;
  background: rgba(30, 59, 85, .95);
  border: 1px solid rgba(31, 227, 210, .16);
}

.page-about .coverage__dot--hot {
  background: var(--cyan);
  border-color: var(--cyan);
  box-shadow: 0 0 0 4px rgba(31, 227, 210, .14);
}

.page-about .coverage__legend {
  display: flex;
  align-items: center;
  gap: 10px;
  margin: 20px 0 0;
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

.page-about .coverage__legend-swatch {
  flex: 0 0 auto;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 0 4px rgba(31, 227, 210, .14);
}

.page-about .coverage__notes {
  display: grid;
  gap: 14px;
  align-content: start;
}

.page-about .coverage__stat {
  display: flex;
  align-items: baseline;
  gap: 14px;
  padding: 16px 20px;
  border: 1px solid var(--border);
  border-radius: var(--radius-sm);
  background: var(--surface);
}

.page-about .coverage__stat .stat__value {
  font-size: clamp(28px, 5vw, 40px);
  font-weight: 200;
  line-height: 1;
  color: var(--cyan);
}

.page-about .coverage__stat .stat__label {
  font-size: 14px;
  line-height: 1.5;
  color: var(--muted);
}

/* ---------- 07 合作与认可 ---------- */

.page-about .partner-grid {
  margin-bottom: clamp(26px, 4vw, 40px);
}

.page-about .partner-card {
  position: relative;
  padding: clamp(20px, 3vw, 28px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: var(--surface);
  transition: transform .24s var(--ease), border-color .24s var(--ease);
}

.page-about .partner-card:hover {
  transform: translateY(-4px);
  border-color: var(--cyan);
}

.page-about .partner-card--accent {
  background: linear-gradient(155deg, rgba(169, 155, 255, .14), rgba(13, 35, 55, .96) 62%);
}

.page-about .partner-card__num {
  display: block;
  margin-bottom: 14px;
  font-size: 12px;
  letter-spacing: .18em;
  color: var(--muted);
}

.page-about .partner-card__title {
  margin: 0 0 10px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 500;
  color: var(--text);
}

.page-about .partner-card__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.75;
  color: var(--muted);
}

.page-about .award {
  display: grid;
  gap: 16px;
  padding: clamp(22px, 3.4vw, 32px);
  border: 1px solid var(--border);
  border-left: 3px solid var(--amber);
  border-radius: var(--radius);
  background: var(--surface);
}

.page-about .award__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: clamp(19px, 2.6vw, 24px);
  font-weight: 400;
  color: var(--text);
}

.page-about .award__text {
  max-width: 66ch;
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

/* ---------- 08 隐私与安全 ---------- */

.page-about .security {
  display: grid;
  gap: clamp(28px, 5vw, 48px);
}

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

.page-about .security__figure .media-frame {
  border-radius: var(--radius);
  overflow: hidden;
  border: 1px solid var(--border);
}

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

.page-about .security__list {
  display: grid;
  gap: clamp(18px, 2.6vw, 26px);
  align-content: start;
}

.page-about .security__item {
  display: grid;
  grid-template-columns: auto 1fr;
  gap: 14px;
  padding-bottom: clamp(18px, 2.6vw, 26px);
  border-bottom: 1px solid var(--border);
}

.page-about .security__item:last-of-type {
  border-bottom: 0;
  padding-bottom: 0;
}

.page-about .security__num {
  font-size: 12px;
  letter-spacing: .16em;
  color: var(--mint);
  padding-top: 3px;
}

.page-about .security__title {
  margin: 0 0 8px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 500;
  color: var(--text);
}

.page-about .security__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.78;
  color: var(--muted);
}

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

/* ---------- 09 下一步 ---------- */

.page-about .about-next {
  padding-bottom: clamp(64px, 10vw, 128px);
}

.page-about .next-band {
  display: grid;
  gap: clamp(24px, 4vw, 40px);
  padding: clamp(26px, 4.4vw, 48px);
  border: 1px solid var(--border);
  border-radius: var(--radius);
  background: linear-gradient(150deg, rgba(11, 58, 68, .8), rgba(13, 35, 55, .96) 58%);
}

.page-about .next-band__index {
  margin: 0 0 12px;
  font-size: 12px;
  letter-spacing: .2em;
  text-transform: uppercase;
  color: var(--cyan);
}

.page-about .next-band__title {
  margin: 0 0 14px;
  font-family: var(--font-display);
  font-size: clamp(23px, 4.4vw, 36px);
  font-weight: 300;
  line-height: 1.26;
  color: var(--text);
}

.page-about .next-band__lead {
  max-width: 56ch;
  margin: 0;
  font-size: 16px;
  line-height: 1.8;
  color: var(--text-soft);
}

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

/* ---------- 响应式 ---------- */

@media (min-width: 720px) {
  .page-about .shell {
    padding-left: 32px;
    padding-right: 32px;
  }

  .page-about .cycle {
    grid-template-columns: repeat(2, 1fr);
    gap: 18px;
  }

  .page-about .security__list {
    grid-template-columns: repeat(2, 1fr);
    column-gap: 28px;
  }

  .page-about .coverage__grid {
    grid-template-columns: repeat(11, 1fr);
  }

  .page-about .next-band {
    grid-template-columns: 1.6fr 1fr;
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .shell {
    max-width: var(--maxw);
    margin: 0 auto;
    padding-left: 40px;
    padding-right: 40px;
  }

  .page-about .about-hero__inner {
    grid-template-columns: minmax(0, 1.35fr) minmax(300px, .65fr);
    align-items: end;
    gap: 48px;
  }

  .page-about .about-hero__panel {
    margin-bottom: 8px;
  }

  .page-about .about-split {
    grid-template-columns: minmax(0, 1.55fr) minmax(280px, .95fr);
    gap: 56px;
  }

  .page-about .timeline__item {
    grid-template-columns: 84px minmax(0, 1fr);
    gap: 24px;
    align-items: start;
  }

  .page-about .timeline__item::before {
    left: -30px;
    top: 6px;
  }

  .page-about .timeline__num {
    padding-top: 3px;
  }

  .page-about .cycle {
    grid-template-columns: repeat(4, 1fr);
    gap: 20px;
  }

  .page-about .coverage {
    grid-template-columns: minmax(0, 1.15fr) minmax(300px, .85fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .security {
    grid-template-columns: minmax(280px, .8fr) minmax(0, 1.2fr);
    gap: 56px;
    align-items: start;
  }

  .page-about .security__list {
    grid-template-columns: 1fr;
  }

  .page-about .award {
    grid-template-columns: auto minmax(0, 1fr);
    align-items: start;
    gap: 24px;
  }
}

@media (min-width: 1280px) {
  .page-about .about-head {
    margin-bottom: 64px;
  }

  .page-about .cycle__step {
    padding: 26px 24px;
  }
}
<<<END>>>
</main>