.page-about {
  --about-shadow: 6px 6px 0 rgba(5, 13, 22, 0.92);
  --about-shadow-lift: 9px 9px 0 rgba(5, 13, 22, 0.92);
  --about-gap: clamp(26px, 4vw, 48px);
  padding-bottom: 0;
}

/* ---------- 首屏 ---------- */

.page-about .about-hero {
  position: relative;
  padding: clamp(26px, 4.5vw, 54px) 0 clamp(34px, 5vw, 64px);
  border-bottom: 1px solid var(--rule);
  background:
    radial-gradient(130% 95% at 8% -10%, rgba(59, 240, 160, 0.08), transparent 58%),
    linear-gradient(180deg, rgba(16, 37, 66, 0.55), rgba(11, 29, 51, 0) 70%);
}

.page-about .about-hero-grid,
.page-about .about-split {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: var(--about-gap);
  align-items: start;
}

.page-about .about-hero-main h1 {
  margin: 14px 0 0;
  font-size: clamp(1.95rem, 4.4vw, 3.5rem);
  line-height: 1.14;
  letter-spacing: -0.022em;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-hero-lede {
  margin: 20px 0 0;
  max-width: 62ch;
  font-size: 1.02rem;
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

/* ---------- 侧栏 ---------- */

.page-about .about-rail {
  align-self: start;
  padding: 22px 22px 24px;
  border: 2px solid var(--rule-strong);
  background: var(--surface-raised);
  box-shadow: var(--about-shadow);
}

.page-about .rail-title {
  margin: 0 0 14px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--gold);
}

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

.page-about .rail-row {
  display: flex;
  align-items: baseline;
  justify-content: space-between;
  gap: 14px;
  padding: 9px 0;
  border-bottom: 1px dashed var(--rule);
}

.page-about .rail-row:last-child {
  border-bottom: 0;
}

.page-about .rail-row dt {
  font-size: 0.9rem;
  line-height: 1.5;
  color: var(--text-soft);
}

.page-about .rail-row dd {
  margin: 0;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: 0.94rem;
  color: var(--accent);
  white-space: nowrap;
}

.page-about .rail-note {
  margin: 16px 0 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--text-soft);
}

.page-about .about-rail--warm {
  background: var(--warm);
  border-color: var(--gold);
  color: var(--paper-ink);
}

.page-about .about-rail--warm .rail-title {
  color: #8A6420;
}

.page-about .about-rail--warm .rail-row {
  border-bottom-color: rgba(36, 30, 22, 0.24);
}

.page-about .about-rail--warm .rail-row dt {
  color: rgba(36, 30, 22, 0.76);
}

.page-about .about-rail--warm .rail-row dd {
  color: #1C5F3E;
}

.page-about .about-rail--warm .rail-note {
  color: rgba(36, 30, 22, 0.72);
}

/* ---------- 通用区块 ---------- */

.page-about .about-section {
  padding: clamp(38px, 5.5vw, 74px) 0;
  border-bottom: 1px solid var(--rule);
}

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

.page-about h2 {
  margin: 12px 0 0;
  font-size: clamp(1.5rem, 2.9vw, 2.25rem);
  line-height: 1.2;
  letter-spacing: -0.016em;
  font-weight: 800;
  color: var(--text);
}

.page-about .about-body p {
  margin: 16px 0 0;
  max-width: 62ch;
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-lede {
  margin: 16px 0 0;
  max-width: 58ch;
  font-size: 1.02rem;
  line-height: 1.8;
  color: var(--text-soft);
}

/* ---------- 图片 ---------- */

.page-about .about-side {
  align-self: start;
  display: grid;
  gap: 14px;
}

.page-about .about-aside-figure {
  margin: 0;
  border: 2px solid var(--rule-strong);
  background: var(--surface-deep);
  box-shadow: var(--about-shadow);
  overflow: hidden;
}

.page-about .about-aside-figure img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 14 / 9;
  object-fit: cover;
}

.page-about .about-cap {
  margin: 0;
  font-size: 12.5px;
  line-height: 1.65;
  color: var(--text-soft);
}

.page-about .about-banner {
  margin: 30px 0 0;
  border: 2px solid var(--rule-strong);
  background: var(--surface-deep);
  box-shadow: var(--about-shadow);
  overflow: hidden;
}

.page-about .about-banner img {
  display: block;
  width: 100%;
  height: auto;
  max-width: 100%;
  aspect-ratio: 2 / 1;
  object-fit: cover;
}

/* ---------- 三个小组 ---------- */

.page-about .crew {
  list-style: none;
  margin: 30px 0 0;
  padding: 0;
  border-top: 2px solid var(--rule-strong);
}

.page-about .crew-item {
  display: grid;
  grid-template-columns: auto minmax(0, 1fr);
  gap: 16px;
  padding: 24px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .crew-no {
  padding-top: 5px;
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold);
}

.page-about .crew-text h3 {
  margin: 0;
  font-size: 1.1rem;
  letter-spacing: 0.005em;
  color: var(--text);
}

.page-about .crew-text p {
  margin: 9px 0 0;
  max-width: 58ch;
  line-height: 1.78;
  color: var(--text-soft);
}

/* ---------- 版本时间线 ---------- */

.page-about .tl {
  list-style: none;
  position: relative;
  margin: 34px 0 0;
  padding: 0;
}

.page-about .tl::before {
  content: "";
  position: absolute;
  left: 19px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  background: linear-gradient(to bottom, var(--neon), var(--gold) 52%, var(--rule-strong));
}

.page-about .tl-item {
  position: relative;
  padding: 0 0 34px 64px;
}

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

.page-about .tl-dot {
  position: absolute;
  left: 0;
  top: 0;
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  border: 2px solid var(--rule-strong);
  background: var(--surface-deep);
  color: var(--slate);
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.02em;
  transition: border-color 0.18s ease, color 0.18s ease, transform 0.18s ease;
}

.page-about .tl-item:hover .tl-dot {
  border-color: var(--neon);
  color: var(--neon);
  transform: translateY(-2px);
}

.page-about .tl-body h3 {
  margin: 5px 0 0;
  font-size: 1.14rem;
  color: var(--text);
}

.page-about .tl-body p {
  margin: 10px 0 0;
  max-width: 58ch;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .tl-gain {
  display: flex;
  flex-wrap: wrap;
  align-items: baseline;
  gap: 10px;
  margin-top: 13px;
  font-size: 0.95rem;
  color: var(--text);
}

/* ---------- 交付节奏 ---------- */

.page-about .cadence {
  list-style: none;
  margin: 32px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  border-top: 2px solid var(--rule-strong);
}

.page-about .cadence-item {
  padding: 24px 0;
  border-bottom: 1px solid var(--rule);
}

.page-about .cadence-item p {
  margin: 14px 0 0;
  max-width: 44ch;
  line-height: 1.78;
  color: var(--text-soft);
}

.page-about .cadence-num {
  display: block;
  font-family: var(--font-mono);
  font-variant-numeric: tabular-nums;
  font-weight: 700;
  font-size: clamp(2rem, 4.2vw, 2.9rem);
  line-height: 1;
  letter-spacing: -0.02em;
  color: var(--neon);
}

.page-about .cadence-num small {
  margin-left: 7px;
  font-size: 0.32em;
  font-weight: 500;
  letter-spacing: 0.1em;
  color: var(--slate);
}

/* ---------- 合作生态 ---------- */

.page-about .rail-list--plain {
  margin-top: 4px;
  padding-top: 4px;
  border-top: 1px dashed var(--rule);
}

.page-about .about-body a {
  color: var(--neon);
  text-decoration: none;
  border-bottom: 1px solid rgba(59, 240, 160, 0.45);
}

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

/* ---------- 认证印章 ---------- */

.page-about .stamps {
  display: flex;
  flex-wrap: wrap;
  gap: 18px;
  margin-top: 28px;
}

.page-about .stamp {
  flex: 1 1 240px;
  max-width: 340px;
  padding: 18px 20px 20px;
  border: 2px solid var(--gold);
  background: rgba(232, 183, 92, 0.06);
  box-shadow: var(--about-shadow);
}

.page-about .stamp-year {
  display: block;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.18em;
  color: var(--gold);
}

.page-about .stamp strong {
  display: block;
  margin-top: 9px;
  font-size: 1.02rem;
  line-height: 1.4;
  color: var(--text);
}

.page-about .stamp p {
  margin: 9px 0 0;
  font-size: 0.92rem;
  line-height: 1.7;
  color: var(--text-soft);
}

/* ---------- 服务地域 ---------- */

.page-about .reach-grid {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 18px;
  margin-top: 30px;
}

.page-about .reach-card {
  padding: 22px 22px 24px;
  border: 1px solid var(--rule-strong);
  border-left: 4px solid var(--accent);
  background: rgba(16, 37, 66, 0.6);
}

.page-about .reach-card h3 {
  margin: 0;
  font-size: 1.06rem;
  color: var(--text);
}

.page-about .reach-card p {
  margin: 10px 0 0;
  line-height: 1.76;
  color: var(--text-soft);
}

/* ---------- 结尾 ---------- */

.page-about .about-cta {
  padding: clamp(34px, 5vw, 62px) 0 clamp(30px, 4vw, 54px);
  background: var(--surface-deep);
  border-top: 2px solid var(--gold);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 26px;
  align-items: center;
}

.page-about .about-cta-text h2 {
  margin: 12px 0 0;
}

.page-about .about-cta-text p {
  margin: 14px 0 0;
  max-width: 56ch;
  line-height: 1.8;
  color: var(--text-soft);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
}

/* ---------- 响应式 ---------- */

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

  .page-about .cadence-item {
    padding: 28px 24px 28px 0;
    border-bottom: 0;
    border-right: 1px solid var(--rule);
  }

  .page-about .cadence-item:last-child {
    border-right: 0;
    padding-right: 0;
  }

  .page-about .cadence-item:not(:first-child) {
    padding-left: 24px;
  }

  .page-about .cadence-item p {
    max-width: none;
  }

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

  .page-about .reach-card {
    border: 0;
    border-left: 4px solid var(--accent);
    background: transparent;
    padding: 4px 22px 4px 20px;
  }

  .page-about .reach-card + .reach-card {
    border-left: 1px solid var(--rule-strong);
  }
}

@media (min-width: 940px) {
  .page-about .about-hero-grid,
  .page-about .about-split {
    grid-template-columns: minmax(0, 2fr) minmax(258px, 1fr);
    gap: clamp(34px, 4vw, 58px);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 2fr) auto;
    gap: 40px;
  }

  .page-about .about-cta-actions {
    flex-wrap: nowrap;
  }
}

@media (max-width: 699px) {
  .page-about .about-banner img {
    aspect-ratio: 16 / 10;
  }

  .page-about .about-aside-figure img {
    aspect-ratio: 16 / 10;
  }

  .page-about .stamp {
    max-width: none;
  }
}

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