.page-about {
  --about-line: rgba(143, 167, 158, 0.26);
  --about-soft: rgba(16, 58, 48, 0.55);
  padding-bottom: 96px;
}

.page-about .crumbs {
  margin: 20px 0 18px;
}

.page-about .crumbs__current {
  color: var(--sand);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.12em;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  border: var(--frame) solid var(--tactical);
  background: var(--deep);
  padding: 26px 20px 30px;
  box-shadow: var(--shadow-hard);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background-image: repeating-linear-gradient(
    90deg,
    var(--sand) 0 2px,
    transparent 2px 16px
  );
  opacity: 0.6;
}

.page-about .about-hero__corner {
  position: absolute;
  right: 12px;
  bottom: 12px;
  width: 34px;
  height: 34px;
  border-right: 4px solid var(--signal);
  border-bottom: 4px solid var(--signal);
  pointer-events: none;
}

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

.page-about .about-hero__kicker {
  margin: 8px 0 12px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--cyan);
}

.page-about .about-hero h1 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 800;
  font-size: clamp(32px, 8.6vw, 64px);
  line-height: 1.06;
  letter-spacing: -0.01em;
  color: var(--fog);
  max-width: 18ch;
}

.page-about .about-hero__lead {
  margin: 18px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .about-hero__cta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

/* ---------- 数字带 ---------- */
.page-about .about-numbers {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin-top: 20px;
  background: var(--about-line);
  border: var(--frame) solid var(--tactical);
}

.page-about .about-numbers__item {
  background: var(--ink);
  padding: 18px 16px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-numbers__num {
  font-size: clamp(28px, 7vw, 40px);
  font-weight: 700;
  line-height: 1;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
}

.page-about .about-numbers__num em {
  font-style: normal;
  color: var(--signal);
  font-size: 0.6em;
}

.page-about .about-numbers__label {
  font-size: 12px;
  line-height: 1.6;
  color: var(--moss);
}

/* ---------- 主结构 ---------- */
.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 36px;
  margin-top: 44px;
}

.page-about .about-rail {
  border-top: var(--frame) solid var(--tactical);
  padding-top: 14px;
}

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

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

.page-about .rail-scale__item {
  position: relative;
  flex: 0 0 auto;
  min-width: 104px;
  padding: 0 16px 12px 0;
  border-top: 2px solid var(--tactical);
}

.page-about .rail-scale__item::before {
  content: "";
  position: absolute;
  top: -5px;
  left: 0;
  width: 8px;
  height: 8px;
  background: var(--sand);
}

.page-about .rail-scale__num {
  display: block;
  padding-top: 14px;
  font-size: 15px;
  color: var(--fog);
  font-variant-numeric: tabular-nums;
}

.page-about .rail-scale__text {
  display: block;
  margin-top: 2px;
  font-size: 11px;
  letter-spacing: 0.06em;
  color: var(--moss);
}

/* ---------- 章节通用 ---------- */
.page-about .about-sec {
  padding-top: 8px;
}

.page-about .about-sec + .about-sec {
  margin-top: 60px;
}

.page-about .about-sec__head {
  position: relative;
  padding-left: 56px;
  margin-bottom: 24px;
}

.page-about .about-sec__no {
  position: absolute;
  left: 0;
  top: 4px;
  font-size: 12px;
  letter-spacing: 0.12em;
  color: var(--sand);
  border: 2px solid var(--tactical);
  padding: 4px 6px;
  line-height: 1;
}

.page-about .about-sec__head h2 {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 700;
  font-size: clamp(24px, 6vw, 38px);
  line-height: 1.14;
  letter-spacing: -0.01em;
  color: var(--fog);
}

.page-about .about-sec__sub {
  margin: 8px 0 0;
  font-size: 13px;
  color: var(--moss);
  letter-spacing: 0.02em;
}

.page-about .about-sec__grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 22px;
}

.page-about .about-sec__text p {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
}

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

.page-about .about-quote {
  display: flex;
  gap: 14px;
  align-items: flex-start;
  margin: 22px 0 0;
  padding: 16px 18px;
  border-left: 6px solid var(--sand);
  background: var(--deep);
}

.page-about .about-quote__no {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--sand);
  padding-top: 3px;
  flex: 0 0 auto;
}

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

/* ---------- 团队档案卡 ---------- */
.page-about .team-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 16px;
}

.page-about .role-card {
  position: relative;
  border: var(--frame) solid var(--tactical);
  background: var(--deep);
  padding: 20px 18px 18px;
  transition: transform var(--dur) var(--ease), border-color var(--dur) var(--ease),
    box-shadow var(--dur) var(--ease);
}

.page-about .role-card::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 26px;
  height: 26px;
  border-left: 3px solid var(--sand);
  border-bottom: 3px solid var(--sand);
  pointer-events: none;
}

.page-about .role-card:hover,
.page-about .role-card:focus-within {
  transform: translate(-2px, -2px);
  border-color: var(--signal);
  box-shadow: var(--shadow-hard);
}

.page-about .role-card__tab {
  display: inline-block;
  font-size: 10px;
  letter-spacing: 0.2em;
  color: var(--ink);
  background: var(--cyan);
  padding: 3px 8px;
}

.page-about .role-card__title {
  margin: 12px 0 6px;
  font-family: var(--font-display);
  font-size: 21px;
  font-weight: 700;
  color: var(--fog);
  letter-spacing: 0.01em;
}

.page-about .role-card__count {
  margin: 0 0 12px;
  font-size: 12px;
  color: var(--moss);
}

.page-about .role-card__count .mono {
  font-size: 22px;
  color: var(--signal);
  margin-right: 4px;
  font-variant-numeric: tabular-nums;
}

.page-about .role-card__duties {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
  border-top: 1px solid var(--about-line);
  padding-top: 12px;
}

.page-about .role-card__duties li {
  position: relative;
  padding-left: 16px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--moss);
}

.page-about .role-card__duties li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.72em;
  width: 6px;
  height: 2px;
  background: var(--cyan);
}

.page-about .team-grid__figure {
  margin: 0;
}

/* ---------- 校验流程 ---------- */
.page-about .check-panel {
  position: relative;
  border: var(--frame) solid var(--tactical);
  background: var(--void);
  padding: 24px 18px 20px;
  overflow: hidden;
}

.page-about .check-panel__bg {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.16;
  filter: grayscale(1) contrast(1.15);
  pointer-events: none;
}

.page-about .check-track {
  position: relative;
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
}

.page-about .check-step {
  position: relative;
  padding: 14px 16px 16px;
  border: var(--frame) solid var(--tactical);
  background: rgba(6, 26, 22, 0.9);
}

.page-about .check-step__no {
  display: inline-block;
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--ink);
  background: var(--sand);
  padding: 3px 8px;
  font-variant-numeric: tabular-nums;
}

.page-about .check-step--extra .check-step__no {
  background: var(--signal);
}

.page-about .check-step__title {
  margin: 10px 0 8px;
  font-family: var(--font-display);
  font-size: 19px;
  font-weight: 700;
  color: var(--fog);
}

.page-about .check-step__desc {
  margin: 0;
  font-size: 13px;
  line-height: 1.75;
  color: var(--moss);
}

.page-about .check-panel__note {
  position: relative;
  margin: 20px 0 0;
  padding-top: 16px;
  border-top: 1px dashed var(--about-line);
  font-size: 13px;
  line-height: 1.75;
  color: var(--cyan);
}

/* ---------- 服务对象 ---------- */
.page-about .who-band {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--about-line);
  border: var(--frame) solid var(--tactical);
}

.page-about .who-item {
  background: var(--ink);
  padding: 20px 18px;
}

.page-about .who-item h3 {
  margin: 12px 0 8px;
  font-family: var(--font-display);
  font-size: 18px;
  font-weight: 700;
  line-height: 1.35;
  color: var(--fog);
}

.page-about .who-item p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .who-foot {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--cyan);
}

/* ---------- 里程碑 ---------- */
.page-about .milestones {
  margin: 20px 0 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border-top: var(--frame) solid var(--tactical);
  border-bottom: var(--frame) solid var(--tactical);
}

.page-about .milestone {
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 14px;
  align-items: start;
  padding: 18px 4px;
  background: var(--ink);
}

.page-about .milestone__year {
  font-size: 16px;
  color: var(--sand);
  font-variant-numeric: tabular-nums;
  padding-top: 2px;
}

.page-about .milestone__body h3 {
  margin: 0 0 6px;
  font-family: var(--font-display);
  font-size: 17px;
  font-weight: 700;
  line-height: 1.4;
  color: var(--fog);
}

.page-about .milestone__body p {
  margin: 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .milestone__tag {
  grid-column: 2;
  justify-self: start;
  margin-top: 2px;
}

.page-about .about-sec__more {
  margin: 16px 0 0;
  font-size: 13px;
  color: var(--moss);
}

.page-about .about-sec__more a,
.page-about .contact-grid__note a {
  color: var(--cyan);
  text-decoration: none;
  border-bottom: 1px solid rgba(63, 224, 208, 0.4);
}

.page-about .about-sec__more a:hover,
.page-about .about-sec__more a:focus-visible,
.page-about .contact-grid__note a:hover,
.page-about .contact-grid__note a:focus-visible {
  color: var(--signal);
  border-bottom-color: var(--signal);
}

/* ---------- 对接 ---------- */
.page-about .contact-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 20px;
}

.page-about .contact-grid__lead {
  margin: 0 0 18px;
  font-size: 15px;
  line-height: 1.85;
  color: var(--fog);
}

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

.page-about .contact-list li {
  background: var(--ink);
  display: grid;
  grid-template-columns: 60px minmax(0, 1fr);
  gap: 12px;
  align-items: baseline;
  padding: 12px 14px;
}

.page-about .contact-list__k {
  font-size: 10px;
  letter-spacing: 0.18em;
  color: var(--moss);
}

.page-about .contact-list__v {
  font-size: 14px;
  color: var(--fog);
  text-decoration: none;
  overflow-wrap: anywhere;
}

.page-about .contact-list__v.mono {
  font-variant-numeric: tabular-nums;
  letter-spacing: 0.04em;
}

.page-about a.contact-list__v:hover,
.page-about a.contact-list__v:focus-visible {
  color: var(--signal);
}

.page-about .contact-grid__note {
  margin: 16px 0 0;
  font-size: 13px;
  line-height: 1.8;
  color: var(--moss);
}

.page-about .contact-grid__panel {
  border: var(--frame) solid var(--signal);
  background: var(--deep);
  padding: 20px 18px;
  box-shadow: var(--shadow-hard);
  align-self: start;
}

.page-about .contact-panel__label {
  margin: 0 0 14px;
  font-size: 11px;
  letter-spacing: 0.22em;
  color: var(--signal);
}

.page-about .contact-panel__list {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 10px;
}

.page-about .contact-panel__list li {
  position: relative;
  padding-left: 20px;
  font-size: 13px;
  line-height: 1.7;
  color: var(--fog);
}

.page-about .contact-panel__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.6em;
  width: 10px;
  height: 10px;
  border: 2px solid var(--cyan);
}

.page-about .contact-panel__btn {
  margin-top: 20px;
  width: 100%;
  justify-content: center;
  text-align: center;
}

/* ---------- 平板 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero {
    padding: 34px 32px 36px;
  }

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

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

  .page-about .team-grid__figure {
    grid-column: 1 / -1;
  }

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

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

  .page-about .milestone {
    grid-template-columns: 76px minmax(0, 1fr) auto;
    align-items: center;
    padding: 18px 8px;
  }

  .page-about .milestone__tag {
    grid-column: 3;
    justify-self: end;
    margin-top: 0;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 44px 90px 48px 40px;
  }

  .page-about .about-hero__rot {
    display: block;
    position: absolute;
    right: 26px;
    top: 40px;
    writing-mode: vertical-rl;
    font-family: var(--font-mono);
    font-size: 11px;
    letter-spacing: 0.3em;
    color: var(--moss);
  }

  .page-about .about-hero__lead {
    font-size: 16px;
  }

  .page-about .about-shell {
    grid-template-columns: minmax(160px, 3fr) minmax(0, 13fr);
    gap: 52px;
    margin-top: 56px;
  }

  .page-about .about-rail {
    position: sticky;
    top: 96px;
    align-self: start;
    border-top: none;
    border-left: var(--frame) solid var(--tactical);
    padding: 4px 0 4px 18px;
  }

  .page-about .rail-scale {
    flex-direction: column;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .rail-scale__item {
    min-width: 0;
    width: 100%;
    padding: 0 0 22px 18px;
    border-top: none;
    border-left: none;
  }

  .page-about .rail-scale__item::before {
    top: 6px;
    left: -5px;
    width: 8px;
    height: 8px;
  }

  .page-about .rail-scale__item::after {
    content: "";
    position: absolute;
    left: -1px;
    top: 14px;
    bottom: 0;
    width: 2px;
    background: var(--tactical);
  }

  .page-about .rail-scale__item:last-child::after {
    display: none;
  }

  .page-about .rail-scale__num {
    padding-top: 0;
    font-size: 16px;
  }

  .page-about .about-sec__grid {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    gap: 32px;
    align-items: start;
  }

  .page-about .team-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr)) minmax(0, 0.85fr);
    gap: 18px;
  }

  .page-about .team-grid__figure {
    grid-column: 3;
    grid-row: 1 / span 2;
    align-self: stretch;
  }

  .page-about .check-track {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 14px;
  }

  .page-about .check-step:not(:last-child)::after {
    content: "";
    position: absolute;
    right: -14px;
    top: 38px;
    width: 14px;
    height: 2px;
    background: var(--sand);
    opacity: 0.7;
  }

  .page-about .check-panel {
    padding: 30px 26px 24px;
  }

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

  .page-about .contact-grid {
    grid-template-columns: minmax(0, 8fr) minmax(0, 4fr);
    gap: 28px;
  }

  .page-about .contact-panel__btn {
    width: auto;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .role-card {
    transition: none;
  }

  .page-about .role-card:hover,
  .page-about .role-card:focus-within {
    transform: none;
  }
}