.page-about {
  --about-rail: 240px;
  padding-bottom: clamp(56px, 9vw, 112px);
}

.page-about .about-crumb {
  margin: clamp(16px, 3vw, 28px) 0 clamp(18px, 3vw, 32px);
}

.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(26px, 5vw, 60px);
}

/* 左窄栏：移动端横排，桌面端纵向书写并吸顶 */
.page-about .about-rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-soft);
}

.page-about .about-rail__title {
  margin: 0;
  font-family: var(--font-display);
  font-weight: 900;
  font-size: clamp(26px, 8vw, 44px);
  line-height: 1;
  letter-spacing: 0.02em;
  color: var(--fg);
}

.page-about .about-rail__note {
  margin: 0;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.2em;
  color: var(--fg-mute);
}

.page-about .about-body {
  position: relative;
  min-width: 0;
}

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

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: var(--about-rail) minmax(0, 1fr);
    gap: clamp(36px, 4vw, 72px);
  }

  .page-about .about-rail {
    position: sticky;
    top: 132px;
    align-self: start;
    display: block;
    padding: 0 0 0 18px;
    border-bottom: 0;
    border-left: 1px solid var(--border);
  }

  .page-about .about-rail__title {
    writing-mode: vertical-rl;
    font-size: clamp(38px, 3.4vw, 62px);
    letter-spacing: 0.22em;
    margin: 0 0 28px;
  }

  .page-about .about-rail__note {
    writing-mode: vertical-rl;
    letter-spacing: 0.3em;
    font-size: 11px;
  }
}

@media (min-width: 1200px) {
  .page-about .about-ticks {
    display: block;
    position: absolute;
    top: 0;
    right: -30px;
    bottom: 0;
    width: 9px;
    background-image: repeating-linear-gradient(to bottom, var(--border) 0 1px, transparent 1px 16px);
    opacity: 0.55;
    pointer-events: none;
  }
}

/* 首屏 */
.page-about .about-hero {
  position: relative;
  padding-top: 4px;
}

.page-about .about-hero__title {
  margin: 14px 0 0;
  font-size: clamp(34px, 8.4vw, 76px);
  line-height: 1.04;
  letter-spacing: -0.015em;
  color: var(--fg);
}

.page-about .about-hero__lede {
  margin: clamp(16px, 2.4vw, 26px) 0 0;
  max-width: 60ch;
  color: var(--fg-mute);
}

.page-about .about-hero__figure {
  margin: clamp(26px, 4vw, 46px) 0 0;
  border-radius: var(--radius-lg);
  overflow: hidden;
}

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

.page-about .about-hero__figure::after {
  content: "";
  position: absolute;
  inset: 0;
  background: linear-gradient(160deg, rgba(77, 240, 200, 0.14), transparent 46%);
  pointer-events: none;
}

.page-about .about-hero__figure {
  position: relative;
}

/* 数据条 */
.page-about .about-stats {
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  margin: clamp(30px, 4vw, 50px) 0 0;
  background: var(--border-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--bg-raise);
  padding: clamp(16px, 2.4vw, 26px);
}

.page-about .about-stat__label {
  margin: 0 0 10px;
  font-size: 12px;
  letter-spacing: 0.14em;
  color: var(--fg-mute);
}

.page-about .about-stat__num {
  margin: 0;
  font-family: var(--font-mono);
  font-size: clamp(26px, 4.4vw, 42px);
  font-weight: 700;
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-about .about-stat__unit {
  margin-left: 5px;
  font-size: 0.4em;
  letter-spacing: 0.06em;
  color: var(--fg-mute);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }
}

/* 章节通用 */
.page-about .about-sec {
  position: relative;
  margin-top: clamp(40px, 6vw, 78px);
  padding-top: clamp(26px, 4vw, 46px);
  border-top: 1px solid var(--border-soft);
}

.page-about .about-sec::before {
  content: "";
  position: absolute;
  top: -3px;
  left: 0;
  width: 46px;
  height: 5px;
  background: var(--accent);
  opacity: 0.85;
}

.page-about .section-head {
  margin-bottom: clamp(16px, 2.4vw, 28px);
}

.page-about .section-head__title {
  font-size: clamp(24px, 4.2vw, 46px);
  line-height: 1.08;
}

.page-about .about-sec .prose {
  max-width: 62ch;
}

.page-about .about-sec .prose p {
  color: var(--fg);
}

/* 引文 */
.page-about .about-quote {
  margin: clamp(20px, 3vw, 32px) 0 0;
  padding: clamp(18px, 2.6vw, 26px) clamp(20px, 3vw, 32px);
  background: var(--bg-raise);
  border-left: 3px solid var(--border-hot);
  border-radius: 0 var(--radius) var(--radius) 0;
  transition: border-color 0.18s ease, box-shadow 0.18s ease;
}

.page-about .about-quote p {
  margin: 0;
  font-family: var(--font-display);
  font-size: clamp(17px, 2.2vw, 22px);
  line-height: 1.6;
  color: var(--fg);
}

.page-about .about-quote:hover,
.page-about .about-quote:focus-within {
  border-left-color: var(--accent);
  box-shadow: var(--glow-neon);
}

/* 团队 */
.page-about .about-cols {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 40px);
  margin-top: clamp(20px, 3vw, 34px);
  align-items: start;
}

.page-about .about-groups {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 14px;
}

.page-about .about-group {
  position: relative;
  padding: 16px 18px;
  transition: transform 0.18s ease;
}

.page-about .about-group::before {
  content: "";
  position: absolute;
  left: 0;
  top: 14px;
  bottom: 14px;
  width: 3px;
  background: var(--accent);
  opacity: 0;
  transition: opacity 0.18s ease;
}

.page-about .about-group:hover::before,
.page-about .about-group:focus-within::before {
  opacity: 1;
}

.page-about .about-group__name {
  margin: 0 0 6px;
  font-size: 17px;
  font-weight: 700;
  color: var(--fg);
}

.page-about .about-group__text {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--fg-mute);
}

.page-about .about-team__figure {
  border-radius: var(--radius);
  overflow: hidden;
}

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

@media (min-width: 620px) {
  .page-about .about-groups {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (min-width: 900px) {
  .page-about .about-cols {
    grid-template-columns: minmax(0, 1.5fr) minmax(0, 1fr);
  }
}

/* 流程三步 */
.page-about .about-steps {
  list-style: none;
  margin: 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 1px;
  background: var(--border-soft);
  border: 1px solid var(--border-soft);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-step {
  background: var(--bg-card);
  padding: clamp(18px, 2.6vw, 30px);
}

.page-about .about-step__no {
  display: block;
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--accent);
}

.page-about .about-step__title {
  margin: 12px 0 8px;
  font-size: 19px;
  color: var(--fg);
}

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

@media (min-width: 860px) {
  .page-about .about-steps {
    grid-template-columns: repeat(3, minmax(0, 1fr));
  }
}

/* 年份时间线 */
.page-about .about-cols--years {
  margin-top: clamp(18px, 2.6vw, 30px);
}

.page-about .about-years__figure {
  border-radius: var(--radius);
  overflow: hidden;
}

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

.page-about .about-years {
  position: relative;
  list-style: none;
  margin: 0;
  padding: 6px 0 0 26px;
}

.page-about .about-years::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 12px;
  bottom: 12px;
  width: 1px;
  background: var(--border);
}

.page-about .about-year {
  position: relative;
  padding-bottom: clamp(22px, 3vw, 32px);
}

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

.page-about .about-year::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--bg);
  border: 2px solid var(--accent);
  transition: transform 0.16s ease, background 0.16s ease, box-shadow 0.16s ease;
}

.page-about .about-year:hover::before,
.page-about .about-year:focus-within::before {
  transform: scale(1.15);
  background: var(--accent);
  box-shadow: 0 0 0 5px rgba(77, 240, 200, 0.16);
}

.page-about .about-year__num {
  font-family: var(--font-mono);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--accent);
  font-variant-numeric: tabular-nums;
}

.page-about .about-year__title {
  margin: 8px 0 6px;
  font-size: 18px;
  color: var(--fg);
  transition: color 0.16s ease;
}

.page-about .about-year:hover .about-year__title,
.page-about .about-year:focus-within .about-year__title {
  color: var(--accent);
}

.page-about .about-year__text {
  margin: 0;
  max-width: 52ch;
  font-size: 15px;
  line-height: 1.75;
  color: var(--fg-mute);
}

@media (min-width: 900px) {
  .page-about .about-cols--years {
    grid-template-columns: minmax(0, 0.72fr) minmax(0, 1.6fr);
  }
}

/* 指标标签 */
.page-about .about-metrics {
  list-style: none;
  margin: clamp(18px, 2.6vw, 28px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 9px;
}

/* 荣誉胶囊 */
.page-about .about-honors {
  list-style: none;
  margin: clamp(20px, 3vw, 30px) 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

/* 结尾行动区 */
.page-about .about-cta {
  margin-top: clamp(44px, 6vw, 84px);
  padding: clamp(26px, 4vw, 48px);
  background: var(--bg-raise);
  border: 1px solid var(--border);
  border-radius: var(--radius-lg);
  background-image: linear-gradient(135deg, rgba(77, 240, 200, 0.1), transparent 58%);
}

.page-about .about-cta__title {
  margin: 0;
  font-size: clamp(24px, 4vw, 42px);
  line-height: 1.1;
  color: var(--fg);
}

.page-about .about-cta__text {
  margin: clamp(14px, 2vw, 20px) 0 0;
  max-width: 56ch;
  font-size: 16px;
  line-height: 1.75;
  color: var(--fg-mute);
}

.page-about .about-cta__actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: clamp(20px, 3vw, 30px);
}

@media (min-width: 900px) {
  .page-about .about-cta {
    display: flex;
    align-items: flex-end;
    justify-content: space-between;
    gap: clamp(28px, 4vw, 60px);
  }

  .page-about .about-cta__actions {
    margin-top: 0;
    flex-direction: column;
    align-items: flex-start;
    flex: 0 0 auto;
  }
}