.page-about {
  --about-space: clamp(52px, 7.5vw, 104px);
  --about-hair: 1px solid var(--line);
  position: relative;
  display: block;
  color: var(--text);
  font-family: var(--font-body);
  padding-bottom: clamp(40px, 6vw, 84px);
}

.page-about .about-crumb {
  padding-top: clamp(18px, 2.6vw, 30px);
  padding-bottom: clamp(14px, 2vw, 22px);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding-bottom: clamp(20px, 3vw, 34px);
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(36px, 7.4vw, 92px);
  line-height: 1.04;
  letter-spacing: 0.05em;
  color: var(--white);
  transform: scaleX(0.95);
  transform-origin: left center;
}

.page-about .about-hero__title-mark {
  position: relative;
  display: inline-block;
  color: var(--cyan);
}

.page-about .about-hero__title-mark::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: 0.06em;
  height: 3px;
  background: linear-gradient(90deg, var(--cyan), var(--purple));
  opacity: 0.65;
}

.page-about .about-hero__lead {
  max-width: 62ch;
  margin: clamp(18px, 2.4vw, 28px) 0 0;
  color: var(--text);
  font-size: clamp(16px, 1.6vw, 18px);
  line-height: 1.85;
}

.page-about .about-hero__stats {
  list-style: none;
  margin: clamp(26px, 3.6vw, 44px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--line);
  border: var(--about-hair);
}

.page-about .about-hero__stat {
  background: var(--panel);
  padding: clamp(16px, 2.2vw, 24px) clamp(14px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-hero__num {
  font-size: clamp(24px, 3.4vw, 38px);
  line-height: 1;
  color: var(--white);
  letter-spacing: 0.04em;
}

.page-about .about-hero__key {
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

/* ---------- 编制刻度尺 ---------- */
.page-about .about-scale {
  margin-top: clamp(22px, 3vw, 36px);
}

.page-about .about-scale__bar {
  height: clamp(20px, 3vw, 30px);
  border-bottom: var(--about-hair);
  background-image: linear-gradient(90deg, var(--line) 1px, transparent 1px);
  background-size: 42px 100%;
  background-repeat: repeat-x;
  background-position: left bottom;
}

.page-about .about-scale__labels {
  display: flex;
  justify-content: space-between;
  gap: 10px;
  margin-top: 10px;
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--muted);
}

.page-about .about-scale__labels span:last-child {
  color: var(--cyan);
}

/* ---------- 首屏图 ---------- */
.page-about .about-hero__figure {
  margin: clamp(26px, 3.6vw, 46px) 0 clamp(46px, 6vw, 80px);
}

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

/* ---------- 章节通用 ---------- */
.page-about .about-block {
  padding-top: var(--about-space);
  padding-bottom: 0;
}

.page-about .about-head {
  max-width: 72ch;
  margin-bottom: clamp(24px, 3.4vw, 40px);
  padding-bottom: clamp(14px, 2vw, 22px);
  border-bottom: var(--about-hair);
}

.page-about .about-head .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 3.6vw, 44px);
  line-height: 1.16;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-head .section-kicker {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-split {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(20px, 3vw, 40px);
  padding-top: var(--about-space);
}

.page-about .about-split__aside {
  padding-bottom: clamp(10px, 1.6vw, 16px);
  border-bottom: var(--about-hair);
}

.page-about .about-split__aside .section-title {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(24px, 3.2vw, 38px);
  line-height: 1.18;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-split__aside .section-kicker {
  margin: 12px 0 0;
  color: var(--muted);
  font-size: 14px;
  line-height: 1.8;
}

.page-about .about-split__main p + p {
  margin-top: 1.2em;
}

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

.page-about .about-split__main a:hover {
  border-bottom-color: var(--cyan);
}

/* ---------- 数据行 ---------- */
.page-about .about-facts {
  margin-top: clamp(24px, 3vw, 36px);
  border-top: var(--about-hair);
}

.page-about .about-facts .data-row {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  gap: 16px;
  padding: 14px 0;
  border-bottom: var(--about-hair);
}

.page-about .about-facts .data-row__key {
  color: var(--muted);
  font-size: 14px;
  letter-spacing: 0.04em;
}

.page-about .about-facts .data-row__value {
  color: var(--white);
  font-size: clamp(16px, 1.8vw, 20px);
  letter-spacing: 0.04em;
}

/* ---------- 产品线对照 ---------- */
.page-about .about-lines {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: var(--about-hair);
}

.page-about .about-line {
  position: relative;
  background: var(--panel);
  padding: clamp(22px, 3vw, 34px) clamp(18px, 2.6vw, 30px);
  transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.page-about .about-line::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 3px;
  height: 100%;
  transform: scaleY(0.35);
  transform-origin: top;
  transition: transform 0.35s ease;
}

.page-about .about-line--cyan::before {
  background: var(--cyan);
}

.page-about .about-line--purple::before {
  background: var(--purple);
}

.page-about .about-line:hover {
  transform: translateY(-4px);
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.45);
}

.page-about .about-line:hover::before {
  transform: scaleY(1);
}

.page-about .about-line__name {
  margin: 16px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 2.8vw, 30px);
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-line__desc {
  margin: 12px 0 0;
  color: var(--text);
  font-size: 15px;
  line-height: 1.8;
}

.page-about .about-line__spec {
  margin: clamp(18px, 2.4vw, 26px) 0 0;
  border-top: var(--about-hair);
}

.page-about .about-line__row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 12px 0;
  border-bottom: 1px dashed rgba(30, 43, 69, 0.85);
}

.page-about .about-line__row dt {
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .about-line__row dd {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--text);
}

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

/* ---------- 六类记录 ---------- */
.page-about .about-records {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: var(--about-hair);
}

.page-about .about-record {
  position: relative;
  background: var(--panel);
  padding: clamp(20px, 2.6vw, 30px);
  transition: background 0.3s ease;
}

.page-about .about-record::after {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  bottom: 0;
  width: 0;
  background: var(--cyan);
  transition: width 0.3s ease;
}

.page-about .about-record:hover::after {
  width: 2px;
}

.page-about .about-record:hover {
  background: #101a2c;
}

.page-about .about-record__no {
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--muted);
}

.page-about .about-record__name {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-record__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-record__keep {
  margin: 16px 0 0;
  padding-top: 12px;
  border-top: 1px dashed rgba(30, 43, 69, 0.9);
  font-size: 11px;
  letter-spacing: 0.1em;
  color: var(--muted);
  opacity: 0.72;
  transition: opacity 0.28s ease, color 0.28s ease;
}

.page-about .about-record:hover .about-record__keep,
.page-about .about-record:focus-within .about-record__keep {
  opacity: 1;
  color: var(--cyan);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 48px);
}

.page-about .about-tl {
  list-style: none;
  margin: 0;
  padding: 0 0 0 28px;
  position: relative;
}

.page-about .about-tl::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--cyan), var(--purple) 58%, var(--orange));
  opacity: 0.55;
}

.page-about .about-tl__item {
  position: relative;
  padding-bottom: clamp(24px, 3.4vw, 38px);
}

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

.page-about .about-tl__item::before {
  content: "";
  position: absolute;
  left: -28px;
  top: 7px;
  width: 9px;
  height: 9px;
  background: var(--bg);
  border: 1px solid var(--cyan);
  border-radius: 50%;
  box-sizing: border-box;
}

.page-about .about-tl__item:nth-child(2)::before {
  border-color: var(--teal-bed);
  background: var(--teal-bed);
}

.page-about .about-tl__item:nth-child(3)::before {
  border-color: var(--purple);
}

.page-about .about-tl__item:nth-child(4)::before {
  border-color: var(--orange);
}

.page-about .about-tl__year {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--line);
  background: var(--panel);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--cyan);
}

.page-about .about-tl__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(17px, 2vw, 21px);
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-tl__desc {
  margin: 8px 0 0;
  max-width: 52ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text);
}

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

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

.page-about .about-history__more {
  margin: clamp(24px, 3vw, 36px) 0 0;
  padding: 14px 18px;
  border-left: 2px solid var(--orange);
  background: var(--panel);
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-history__more a {
  color: var(--orange);
  text-decoration: none;
  border-bottom: 1px solid rgba(255, 154, 77, 0.45);
}

/* ---------- 团队 ---------- */
.page-about .about-split--team .about-team {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: var(--about-hair);
}

.page-about .about-team__card {
  background: var(--panel);
  padding: clamp(20px, 2.6vw, 28px);
}

.page-about .about-team__no {
  font-size: clamp(20px, 2.6vw, 28px);
  letter-spacing: 0.04em;
  color: var(--cyan);
}

.page-about .about-team__name {
  margin: 10px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: 17px;
  letter-spacing: 0.05em;
  color: var(--white);
}

.page-about .about-team__desc {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-team__figure {
  margin: clamp(22px, 3vw, 32px) 0 0;
}

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

.page-about .about-split--team .body-copy {
  margin-top: clamp(20px, 2.6vw, 28px);
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
}

/* ---------- 合作与来源 ---------- */
.page-about .about-sources {
  display: grid;
  grid-template-columns: 1fr;
  gap: 1px;
  background: var(--line);
  border: var(--about-hair);
}

.page-about .about-source {
  background: var(--panel);
  padding: clamp(22px, 3vw, 32px);
}

.page-about .about-source__num {
  display: block;
  font-size: clamp(30px, 4.4vw, 52px);
  line-height: 1;
  color: var(--purple);
  letter-spacing: 0.02em;
}

.page-about .about-source__name {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 500;
  font-size: clamp(17px, 2vw, 20px);
  letter-spacing: 0.04em;
  color: var(--white);
}

.page-about .about-source p {
  margin: 10px 0 0;
  font-size: 14px;
  line-height: 1.85;
  color: var(--text);
}

.page-about .about-source--note {
  background: var(--teal-bed);
}

.page-about .about-source--note .notice__label {
  display: inline-block;
  padding: 3px 8px;
  border: 1px solid var(--orange);
  color: var(--orange);
  font-size: 11px;
  letter-spacing: 0.14em;
}

.page-about .about-source--note p + p {
  margin-top: 12px;
}

.page-about .about-source--note p:last-child {
  color: rgba(242, 245, 251, 0.88);
}

/* ---------- 收尾 ---------- */
.page-about .about-cta {
  margin-top: clamp(56px, 8vw, 104px);
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(18px, 2.6vw, 32px);
  padding: clamp(26px, 3.6vw, 44px);
  border: var(--about-hair);
  border-left: 3px solid var(--cyan);
  background: linear-gradient(120deg, var(--panel) 0%, #0b1120 100%);
}

.page-about .about-cta__title {
  margin: 12px 0 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(22px, 3vw, 34px);
  line-height: 1.2;
  letter-spacing: 0.03em;
  color: var(--white);
}

.page-about .about-cta__desc {
  margin: 12px 0 0;
  max-width: 58ch;
  font-size: 14px;
  line-height: 1.85;
  color: var(--muted);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about .about-cta__actions .btn {
  text-decoration: none;
}

/* ---------- 章节高亮 ---------- */
.page-about .about-block.is-active .section-index {
  color: var(--cyan);
}

.page-about .about-hero.is-active .eyebrow {
  color: var(--cyan);
}

/* ---------- 平板 ---------- */
@media (min-width: 720px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

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

  .page-about .about-lines .about-line + .about-line {
    border-top: 0;
  }

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

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

  .page-about .about-source--note {
    grid-column: 1 / -1;
  }

  .page-about .about-line__row {
    grid-template-columns: 132px 1fr;
    gap: 14px;
    align-items: baseline;
  }
}

/* ---------- 桌面 ---------- */
@media (min-width: 1000px) {
  .page-about .about-split {
    grid-template-columns: 38fr 62fr;
    gap: clamp(32px, 4vw, 64px);
    align-items: start;
  }

  .page-about .about-split__aside {
    position: sticky;
    top: 96px;
    padding-bottom: 0;
    border-bottom: 0;
    border-right: var(--about-hair);
    padding-right: clamp(18px, 2.4vw, 32px);
  }

  .page-about .about-history {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    align-items: start;
  }

  .page-about .about-history__figure {
    position: sticky;
    top: 96px;
  }

  .page-about .about-cta {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 0.6fr);
    align-items: end;
  }

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

/* ---------- 超窄屏保护 ---------- */
@media (max-width: 420px) {
  .page-about .about-hero__title {
    letter-spacing: 0.02em;
  }

  .page-about .about-scale__labels {
    flex-direction: column;
    align-items: flex-start;
    gap: 4px;
  }
}