.page-about {
  --about-hair: 1px solid var(--steel);
  --about-radius: 4px;
  position: relative;
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  position: relative;
  padding: calc(var(--bar-h) + 22px) 0 40px;
}

.page-about .about-hero__frame {
  margin-top: 18px;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: var(--about-hair);
  border-radius: var(--about-radius);
  overflow: hidden;
  position: relative;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 96px;
  height: 3px;
  background: linear-gradient(90deg, var(--flame), rgba(255, 90, 31, 0));
  z-index: 2;
}

.page-about .about-hero__col,
.page-about .about-hero__aside {
  background: linear-gradient(180deg, var(--char-2) 0%, var(--ink) 100%);
  padding: clamp(22px, 4vw, 46px);
}

.page-about .about-hero__col h1 {
  margin: 16px 0 0;
  font-size: clamp(30px, 5.4vw, 60px);
  font-weight: 200;
  line-height: 1.1;
  letter-spacing: -0.025em;
  color: var(--ice);
}

.page-about .about-hero__lede {
  margin: 22px 0 0;
  max-width: 46ch;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--text);
}

.page-about .about-hero__actions {
  margin-top: 30px;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .about-hero__aside-title {
  margin: 0 0 6px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-hero__facts {
  margin: 0;
  display: grid;
}

.page-about .about-hero__facts > div {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 16px;
  padding: 13px 0;
  border-bottom: var(--about-hair);
}

.page-about .about-hero__facts > div:last-child {
  border-bottom: 0;
}

.page-about .about-hero__facts dt {
  font-size: 13.5px;
  color: var(--slate);
  letter-spacing: 0.02em;
}

.page-about .about-hero__facts dd {
  margin: 0;
  font-size: 16px;
  color: var(--ice);
  text-align: right;
}

/* ---------- 通用章节题头 ---------- */
.page-about .about-head {
  max-width: 780px;
  margin-bottom: clamp(24px, 3.6vw, 46px);
}

.page-about .about-head h2 {
  margin: 14px 0 0;
  font-size: clamp(23px, 3.2vw, 38px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.012em;
  color: var(--ice);
}

.page-about .about-head__lede {
  margin: 16px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--text);
}

/* ---------- 起点与定位 ---------- */
.page-about .about-position__grid {
  display: grid;
  gap: 14px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-position__card {
  position: relative;
  padding: 26px 22px 24px;
  background: linear-gradient(160deg, var(--char) 0%, var(--ink) 100%);
  border: var(--about-hair);
  border-left: 2px solid var(--flame);
  border-radius: var(--about-radius);
  transition: border-color 0.25s var(--ease), transform 0.25s var(--ease);
}

.page-about .about-position__card:hover {
  border-left-color: var(--data);
  transform: translateY(-3px);
}

.page-about .about-position__idx {
  display: inline-block;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--slate);
}

.page-about .about-position__card h3 {
  margin: 12px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .about-position__card p {
  margin: 12px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text);
}

.page-about .about-position__note {
  padding-top: 12px;
  border-top: 1px dashed var(--steel);
  font-size: 13.5px;
  color: var(--slate);
}

/* ---------- 时间线 ---------- */
.page-about .about-timeline__figure {
  margin: 0 0 clamp(28px, 4vw, 48px);
}

.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 8px;
  bottom: 30px;
  width: 1px;
  background: linear-gradient(180deg, var(--flame) 0%, var(--steel) 58%, rgba(47, 54, 70, 0) 100%);
}

.page-about .timeline__item {
  position: relative;
  padding: 0 0 30px 30px;
}

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 5px;
  width: 13px;
  height: 13px;
  border-radius: 50%;
  background: var(--ink);
  border: 2px solid var(--flame);
  box-shadow: 0 0 0 4px rgba(255, 90, 31, 0.12);
}

.page-about .timeline__year {
  font-size: 21px;
  font-weight: 600;
  color: var(--flame);
  line-height: 1;
  letter-spacing: -0.01em;
}

.page-about .timeline__body h3 {
  margin: 10px 0 0;
  font-size: 18px;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .timeline__body > p {
  margin: 10px 0 0;
  font-size: 15.5px;
  line-height: 1.75;
  color: var(--text);
  max-width: 62ch;
}

.page-about .timeline__more {
  margin-top: 14px;
  border-top: 1px dashed var(--steel);
  padding-top: 11px;
}

.page-about .timeline__more summary {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  cursor: pointer;
  list-style: none;
  font-family: var(--mono);
  font-size: 12.5px;
  letter-spacing: 0.06em;
  color: var(--data);
}

.page-about .timeline__more summary::-webkit-details-marker {
  display: none;
}

.page-about .timeline__more summary::after {
  content: "+";
  display: inline-block;
  width: 16px;
  height: 16px;
  line-height: 15px;
  text-align: center;
  border: 1px solid currentColor;
  border-radius: 50%;
  font-size: 12px;
}

.page-about .timeline__more[open] summary::after {
  content: "−";
}

.page-about .timeline__more summary:hover {
  color: var(--flame);
}

.page-about .timeline__more p {
  margin: 10px 0 0;
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--slate);
  max-width: 62ch;
}

/* ---------- 能力矩阵 ---------- */
.page-about .about-matrix__grid {
  display: grid;
  gap: 1px;
  grid-template-columns: minmax(0, 1fr);
  background: var(--steel);
  border: var(--about-hair);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-matrix__cell {
  background: var(--ink);
  padding: 26px 22px 28px;
  transition: background 0.25s var(--ease);
}

.page-about .about-matrix__cell:hover {
  background: var(--char-2);
}

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

.page-about .about-matrix__idx {
  font-size: 11.5px;
  letter-spacing: 0.2em;
  color: var(--flame);
}

.page-about .about-matrix__tick {
  flex: 1;
  height: 1px;
  background: repeating-linear-gradient(90deg, var(--steel) 0 6px, transparent 6px 12px);
}

.page-about .about-matrix__cell h3 {
  margin: 14px 0 0;
  font-size: 19px;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .about-matrix__cell > p {
  margin: 12px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text);
}

.page-about .about-matrix__list {
  list-style: none;
  margin: 16px 0 0;
  padding: 0;
  display: grid;
  gap: 8px;
}

.page-about .about-matrix__list li {
  position: relative;
  padding-left: 16px;
  font-size: 13.5px;
  line-height: 1.6;
  color: var(--slate);
}

.page-about .about-matrix__list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 8px;
  width: 6px;
  height: 6px;
  border: 1px solid var(--data);
  transform: rotate(45deg);
}

/* ---------- 团队与协作 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(26px, 4vw, 48px);
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-team__copy h2 {
  margin: 14px 0 0;
  font-size: clamp(23px, 3.2vw, 38px);
  font-weight: 700;
  line-height: 1.18;
  letter-spacing: -0.012em;
  color: var(--ice);
}

.page-about .about-team__copy > p {
  margin: 16px 0 0;
  font-size: 16.5px;
  line-height: 1.78;
  color: var(--text);
  max-width: 60ch;
}

.page-about .about-team__pulse {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: var(--about-hair);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-team__pulse li {
  background: var(--ink);
  padding: 13px 16px;
  font-size: 14.5px;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-team__pulse .num {
  display: inline-block;
  min-width: 62px;
  color: var(--neon);
  font-size: 13.5px;
  letter-spacing: 0.04em;
}

.page-about .about-team__panel {
  border: var(--about-hair);
  border-radius: var(--about-radius);
  background: linear-gradient(180deg, var(--char) 0%, var(--ink) 100%);
  padding: clamp(20px, 3vw, 30px);
}

.page-about .about-team__panel-title {
  margin: 0 0 20px;
  font-family: var(--mono);
  font-size: 11.5px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--slate);
}

.page-about .about-team__bars {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 14px;
}

.page-about .about-team__bars li {
  display: grid;
  grid-template-columns: 76px minmax(0, 1fr) 34px;
  align-items: center;
  gap: 12px;
}

.page-about .about-team__key {
  font-size: 13.5px;
  color: var(--text);
}

.page-about .about-team__bar {
  position: relative;
  display: block;
  height: 6px;
  border-radius: 999px;
  background: var(--steel);
  overflow: hidden;
}

.page-about .about-team__bar::after {
  content: "";
  position: absolute;
  top: 0;
  bottom: 0;
  left: 0;
  width: var(--w, 40%);
  border-radius: inherit;
  background: linear-gradient(90deg, var(--flame-deep), var(--flame));
}

.page-about .about-team__val {
  text-align: right;
  font-size: 15px;
  color: var(--flame);
}

.page-about .about-team__figure {
  margin: 26px 0 0;
}

/* ---------- 服务网络 ---------- */
.page-about .about-network__stats {
  display: grid;
  gap: 1px;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  background: var(--steel);
  border: var(--about-hair);
  border-radius: var(--about-radius);
  overflow: hidden;
  margin-bottom: clamp(24px, 3.6vw, 40px);
}

.page-about .about-network__stat {
  background: var(--ink);
  padding: 20px 18px;
  display: flex;
  flex-direction: column;
  gap: 8px;
}

.page-about .about-network__num {
  font-size: clamp(24px, 3.4vw, 34px);
  font-weight: 600;
  line-height: 1;
  color: var(--flame);
}

.page-about .about-network__unit {
  font-size: 13.5px;
  line-height: 1.5;
  color: var(--slate);
}

.page-about .about-network__split {
  display: grid;
  gap: clamp(24px, 3.6vw, 40px);
  grid-template-columns: minmax(0, 1fr);
  align-items: start;
}

.page-about .about-network__cards {
  display: grid;
  gap: 12px;
}

.page-about .about-network__card {
  padding: 20px 20px 22px;
  background: var(--char);
  border: var(--about-hair);
  border-radius: var(--about-radius);
  border-top: 2px solid var(--data);
}

.page-about .about-network__card h3 {
  margin: 0;
  font-size: 17.5px;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .about-network__card p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text);
}

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

/* ---------- 荣誉 ---------- */
.page-about .about-honors__list {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--steel);
  border: var(--about-hair);
  border-radius: var(--about-radius);
  overflow: hidden;
}

.page-about .about-honors__item {
  background: var(--ink);
  display: grid;
  gap: 10px;
  grid-template-columns: minmax(0, 1fr);
  padding: 24px 22px;
  position: relative;
}

.page-about .about-honors__item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  background: linear-gradient(180deg, var(--neon), rgba(184, 255, 59, 0));
}

.page-about .about-honors__year {
  font-size: 22px;
  font-weight: 600;
  color: var(--neon);
  line-height: 1;
}

.page-about .about-honors__body h3 {
  margin: 0;
  font-size: 18.5px;
  font-weight: 700;
  color: var(--ice);
  letter-spacing: -0.01em;
}

.page-about .about-honors__body p {
  margin: 10px 0 0;
  font-size: 15px;
  line-height: 1.76;
  color: var(--text);
  max-width: 64ch;
}

.page-about .about-honors__foot {
  margin: 24px 0 0;
  padding-left: 16px;
  border-left: 2px solid var(--flame);
  font-size: 15px;
  line-height: 1.75;
  color: var(--slate);
  max-width: 68ch;
}

/* ---------- 收尾行动 ---------- */
.page-about .about-cta {
  margin-top: clamp(40px, 5vw, 72px);
  border-top: var(--about-hair);
  border-bottom: var(--about-hair);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(255, 90, 31, 0.18) 0%, rgba(10, 12, 16, 0) 58%),
    linear-gradient(112deg, var(--char) 0%, var(--ink) 62%);
  position: relative;
  overflow: hidden;
}

.page-about .about-cta::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image:
    linear-gradient(90deg, rgba(47, 54, 70, 0.55) 1px, transparent 1px),
    linear-gradient(180deg, rgba(47, 54, 70, 0.35) 1px, transparent 1px);
  background-size: 88px 88px;
  opacity: 0.4;
  pointer-events: none;
}

.page-about .about-cta__inner {
  position: relative;
  padding: clamp(34px, 5vw, 68px) 0;
  display: grid;
  gap: 26px;
  grid-template-columns: minmax(0, 1fr);
}

.page-about .about-cta__copy h2 {
  margin: 14px 0 0;
  font-size: clamp(23px, 3.2vw, 36px);
  font-weight: 700;
  line-height: 1.2;
  letter-spacing: -0.012em;
  color: var(--ice);
}

.page-about .about-cta__copy p {
  margin: 16px 0 0;
  font-size: 16px;
  line-height: 1.78;
  color: var(--text);
  max-width: 56ch;
}

.page-about .about-cta__links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-content: start;
}

/* ---------- 响应式 ---------- */
@media (min-width: 700px) {
  .page-about .about-position__grid {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }

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

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

  .page-about .about-honors__item {
    grid-template-columns: 96px minmax(0, 1fr);
    align-items: baseline;
    gap: 24px;
  }

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

@media (min-width: 900px) {
  .page-about .about-hero {
    padding: 68px 0 56px;
  }

  .page-about .about-hero__frame {
    grid-template-columns: minmax(0, 7fr) minmax(0, 4fr);
  }

  .page-about .timeline::before {
    left: 6px;
  }

  .page-about .timeline__item {
    display: grid;
    grid-template-columns: 82px minmax(0, 1fr);
    gap: 30px;
    padding-left: 32px;
  }

  .page-about .timeline__item::before {
    left: 0;
    top: 3px;
  }

  .page-about .timeline__year {
    text-align: right;
    font-size: 23px;
  }

  .page-about .timeline__body h3 {
    margin-top: 0;
  }

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

  .page-about .about-network__split {
    grid-template-columns: minmax(0, 6fr) minmax(0, 5fr);
  }

  .page-about .about-cta__inner {
    grid-template-columns: minmax(0, 7fr) minmax(0, 5fr);
    align-items: center;
  }

  .page-about .about-cta__links {
    justify-content: flex-end;
  }
}

@media (min-width: 1200px) {
  .page-about .about-matrix__grid {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-position__card,
  .page-about .about-matrix__cell {
    transition: none;
  }

  .page-about .about-position__card:hover {
    transform: none;
  }
}

.page-about {
  --w: 1rem;
}