.page-about {
  --about-rail: 200px;
  --about-gap: clamp(24px, 4vw, 64px);
  --about-pad-y: clamp(56px, 8vw, 112px);
  --about-line: rgba(200, 145, 42, 0.28);
  --about-glass-1: linear-gradient(90deg, var(--gold), var(--gold-bright));
  --about-glass-2: linear-gradient(90deg, var(--gold-ink), var(--gold));
  --about-glass-3: linear-gradient(90deg, var(--muted), var(--graphite));
  --about-glass-4: linear-gradient(90deg, var(--gold-bright), rgba(242, 193, 91, 0.3));
  background: var(--ink);
  color: var(--champagne);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  padding: clamp(22px, 3vw, 40px) 0 var(--about-pad-y);
  background:
    radial-gradient(120% 90% at 94% -12%, rgba(31, 122, 140, 0.20), transparent 58%),
    radial-gradient(90% 80% at -6% 108%, rgba(200, 145, 42, 0.18), transparent 62%),
    var(--ink);
  border-bottom: 1px solid var(--about-line);
}

.page-about .breadcrumb {
  color: var(--muted);
}

.page-about .about-hero__title {
  margin: clamp(22px, 3vw, 42px) 0 0;
  font-size: clamp(36px, 6.6vw, 88px);
  line-height: 1.04;
  letter-spacing: -0.03em;
  font-weight: 900;
  color: var(--ivory);
  max-width: 18em;
}

.page-about .about-hero__lede {
  margin: clamp(20px, 2.6vw, 32px) 0 0;
  max-width: 62ch;
  font-size: clamp(15.5px, 1.1vw, 18px);
  line-height: 1.85;
  color: rgba(244, 238, 226, 0.78);
}

.page-about .about-hero__stats {
  margin-top: clamp(34px, 5vw, 66px);
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border-top: 1px solid var(--about-line);
  border-bottom: 1px solid var(--about-line);
}

.page-about .hero-stat {
  background: var(--ink);
  padding: 22px 20px 24px;
  display: flex;
  flex-direction: column;
  gap: 9px;
}

.page-about .hero-stat__num {
  font-family: var(--font-geo);
  font-size: clamp(26px, 2.6vw, 38px);
  letter-spacing: 0.02em;
  color: var(--gold-bright);
  line-height: 1;
}

.page-about .hero-stat__label {
  font-size: 13px;
  line-height: 1.6;
  color: var(--muted);
}

/* ---------- 发展历程 ---------- */
.page-about .about-history {
  background: var(--champagne);
  color: var(--ink-2);
  padding: var(--about-pad-y) 0;
}

.page-about .about-history__grid {
  display: grid;
  gap: var(--about-gap);
}

.page-about .about-rail__note {
  margin-top: 16px;
  font-family: var(--font-mono);
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold-ink);
}

.page-about .about-history .eyebrow,
.page-about .about-lanes .eyebrow,
.page-about .about-team .eyebrow {
  color: var(--gold-ink);
}

.page-about .about-history .section__title,
.page-about .about-lanes .section__title,
.page-about .about-team .section__title {
  font-size: clamp(27px, 3.5vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--ink-2);
}

.page-about .about-history .section__title::after,
.page-about .about-lanes .section__title::after,
.page-about .about-team .section__title::after {
  content: "";
  display: block;
  width: 64px;
  height: 1px;
  margin-top: 18px;
  background: var(--gold);
}

.page-about .about-body__lede {
  margin: clamp(22px, 2.6vw, 32px) 0 0;
  max-width: 62ch;
  font-size: 16px;
  line-height: 1.9;
  color: rgba(21, 24, 29, 0.78);
}

.page-about .timeline {
  position: relative;
  margin: clamp(32px, 4vw, 54px) 0 0;
  padding: 0 0 0 26px;
  list-style: none;
}

.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 4px;
  top: 8px;
  bottom: 8px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), rgba(122, 84, 16, 0.22));
}

.page-about .timeline__item {
  position: relative;
  padding-bottom: clamp(26px, 3vw, 40px);
}

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

.page-about .timeline__item::before {
  content: "";
  position: absolute;
  left: -26px;
  top: 5px;
  width: 9px;
  height: 9px;
  background: var(--champagne);
  border: 1px solid var(--gold);
}

.page-about .timeline__meta {
  display: flex;
  align-items: baseline;
  flex-wrap: wrap;
  gap: 12px;
}

.page-about .timeline__year {
  font-family: var(--font-geo);
  font-size: 19px;
  letter-spacing: 0.06em;
  color: var(--gold-ink);
}

.page-about .timeline__code {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--graphite);
  border: 1px solid rgba(122, 84, 16, 0.3);
  padding: 2px 7px;
}

.page-about .timeline__body h3 {
  margin: 10px 0 8px;
  font-size: clamp(17px, 1.4vw, 20px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ink-2);
}

.page-about .timeline__body p {
  margin: 0;
  max-width: 60ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(21, 24, 29, 0.72);
}

.page-about .about-history__media {
  margin-top: clamp(34px, 4.5vw, 60px);
}

/* ---------- 图片容器 ---------- */
.page-about .media img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .media__cap {
  color: var(--muted);
}

/* ---------- 四类条款 ---------- */
.page-about .about-clauses {
  background: var(--ink-2);
  color: var(--champagne);
  padding: var(--about-pad-y) 0;
}

.page-about .about-clauses .section__title {
  font-size: clamp(27px, 3.4vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--ivory);
}

.page-about .about-clauses .section__lede {
  max-width: 64ch;
  margin-top: 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 238, 226, 0.72);
}

.page-about .clause-band {
  margin-top: clamp(32px, 4vw, 56px);
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .clause-card {
  background: var(--ink-2);
  padding: clamp(22px, 2.4vw, 32px);
}

.page-about .clause-card::before {
  content: "";
  display: block;
  height: 3px;
  width: 100%;
  margin-bottom: 22px;
}

.page-about .clause-card--1::before { background: var(--about-glass-1); }
.page-about .clause-card--2::before { background: var(--about-glass-2); }
.page-about .clause-card--3::before { background: var(--about-glass-3); }
.page-about .clause-card--4::before { background: var(--about-glass-4); }

.page-about .clause-card__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  color: var(--muted);
}

.page-about .clause-card__title {
  margin: 12px 0 10px;
  font-size: 19px;
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ivory);
}

.page-about .clause-card__meta {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-geo);
  font-size: 22px;
  letter-spacing: 0.02em;
  color: var(--gold-bright);
}

.page-about .clause-card p {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.8;
  color: rgba(244, 238, 226, 0.72);
}

.page-about .clauses-media {
  margin-top: clamp(28px, 3.4vw, 46px);
  max-width: 1000px;
}

/* ---------- 双业务线 ---------- */
.page-about .about-lanes {
  background: var(--ivory);
  color: var(--ink-2);
  padding: var(--about-pad-y) 0;
}

.page-about .about-lanes .section__lede {
  max-width: 64ch;
  margin-top: 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(21, 24, 29, 0.74);
}

.page-about .lanes {
  display: grid;
  gap: 44px;
  margin-top: clamp(32px, 4vw, 56px);
}

.page-about .lane__tag {
  display: inline-block;
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.14em;
  padding: 5px 10px;
  border: 1px solid currentColor;
}

.page-about .lane--gd .lane__tag { color: var(--blue); }
.page-about .lane--sh .lane__tag { color: var(--coral); }

.page-about .lane__title {
  margin: 18px 0 14px;
  font-size: clamp(20px, 2vw, 26px);
  font-weight: 800;
  line-height: 1.35;
  letter-spacing: -0.02em;
  color: var(--ink-2);
}

.page-about .lane__facts {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about .lane__facts li {
  position: relative;
  padding: 11px 0 11px 20px;
  border-bottom: 1px solid rgba(21, 24, 29, 0.1);
  font-size: 15px;
  line-height: 1.75;
  color: rgba(21, 24, 29, 0.78);
}

.page-about .lane__facts li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  width: 10px;
  height: 1px;
  background: var(--gold);
}

.page-about .lane__note {
  margin: 18px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--graphite);
}

.page-about .lanes__more {
  margin: clamp(30px, 3.6vw, 48px) 0 0;
  padding-top: 22px;
  border-top: 1px solid rgba(122, 84, 16, 0.25);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(21, 24, 29, 0.76);
}

.page-about .lanes__link,
.page-about .channel-foot__link,
.page-about .about-next__link {
  margin-left: 6px;
  color: var(--gold-ink);
  text-decoration: none;
  border-bottom: 1px solid var(--gold);
  transition: color 0.24s ease-out, border-color 0.24s ease-out;
}

.page-about .lanes__link:hover,
.page-about .channel-foot__link:hover,
.page-about .about-next__link:hover {
  color: var(--gold-bright);
  border-color: var(--gold-bright);
}

/* ---------- 合作渠道 ---------- */
.page-about .about-channel {
  background: var(--ink);
  color: var(--champagne);
  padding: var(--about-pad-y) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-channel .section__title {
  font-size: clamp(27px, 3.4vw, 44px);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--ivory);
}

.page-about .about-channel .section__lede {
  max-width: 66ch;
  margin-top: 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 238, 226, 0.74);
}

.page-about .channel-views {
  margin-top: clamp(30px, 4vw, 50px);
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .channel-view {
  background: var(--ink);
  padding: clamp(24px, 3vw, 40px);
}

.page-about .channel-view__role {
  margin: 0 0 18px;
  font-family: var(--font-geo);
  font-size: 13px;
  letter-spacing: 0.14em;
  color: var(--gold-bright);
}

.page-about .channel-view__list {
  list-style: none;
  margin: 0;
  padding: 0;
  counter-reset: cv;
}

.page-about .channel-view__list li {
  counter-increment: cv;
  display: grid;
  grid-template-columns: 34px 1fr;
  gap: 10px;
  padding: 14px 0;
  border-top: 1px solid var(--line-soft);
  font-size: 15px;
  line-height: 1.8;
  color: rgba(244, 238, 226, 0.8);
}

.page-about .channel-view__list li::before {
  content: "0" counter(cv);
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.12em;
  color: var(--gold);
  padding-top: 5px;
}

.page-about .channel-foot {
  margin: clamp(28px, 3.4vw, 44px) 0 0;
  max-width: 66ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(244, 238, 226, 0.74);
}

.page-about .channel-foot__link {
  color: var(--gold-bright);
}

/* ---------- 团队与档案 ---------- */
.page-about .about-team {
  background: var(--champagne);
  color: var(--ink-2);
  padding: var(--about-pad-y) 0;
}

.page-about .about-team .section__lede {
  max-width: 66ch;
  margin-top: 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(21, 24, 29, 0.74);
}

.page-about .team-roster {
  list-style: none;
  margin: clamp(30px, 3.6vw, 48px) 0 0;
  padding: 0;
  border-top: 1px solid rgba(122, 84, 16, 0.28);
}

.page-about .team-roster li {
  display: grid;
  grid-template-columns: 72px 1fr;
  gap: 16px;
  align-items: baseline;
  padding: 16px 0;
  border-bottom: 1px solid rgba(122, 84, 16, 0.18);
}

.page-about .team-roster__num {
  font-family: var(--font-geo);
  font-size: clamp(22px, 2.2vw, 30px);
  letter-spacing: 0.02em;
  color: var(--gold-ink);
  line-height: 1;
}

.page-about .team-roster__desc {
  font-size: 15px;
  line-height: 1.78;
  color: rgba(21, 24, 29, 0.76);
}

.page-about .team-note {
  margin: clamp(26px, 3vw, 40px) 0 0;
  max-width: 66ch;
  padding-left: 18px;
  border-left: 1px solid var(--gold);
  font-size: 15px;
  line-height: 1.85;
  color: rgba(21, 24, 29, 0.78);
}

.page-about .team-media {
  margin-top: clamp(32px, 4vw, 56px);
}

/* ---------- 下一步 ---------- */
.page-about .about-next {
  background: var(--ink-2);
  color: var(--champagne);
  padding: var(--about-pad-y) 0;
  border-top: 1px solid var(--about-line);
}

.page-about .about-next .section__title {
  font-size: clamp(27px, 3.4vw, 42px);
  line-height: 1.16;
  letter-spacing: -0.025em;
  font-weight: 900;
  color: var(--ivory);
}

.page-about .about-next .section__lede {
  max-width: 62ch;
  margin-top: 18px;
  font-size: 15.5px;
  line-height: 1.85;
  color: rgba(244, 238, 226, 0.74);
}

.page-about .next-grid {
  margin-top: clamp(30px, 4vw, 52px);
  display: grid;
  gap: 1px;
  background: var(--about-line);
  border: 1px solid var(--about-line);
}

.page-about .next-card {
  background: var(--ink-2);
  padding: clamp(24px, 3vw, 36px);
}

.page-about .next-card__no {
  font-family: var(--font-mono);
  font-size: 11px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .next-card__title {
  margin: 14px 0 12px;
  font-size: clamp(18px, 1.7vw, 21px);
  font-weight: 700;
  letter-spacing: -0.01em;
  color: var(--ivory);
}

.page-about .next-card p {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: rgba(244, 238, 226, 0.72);
}

.page-about .about-cta {
  margin-top: clamp(32px, 4vw, 54px);
  padding: clamp(26px, 3.4vw, 44px);
  display: grid;
  gap: 22px;
  border: 1px solid var(--about-line);
  background:
    radial-gradient(120% 140% at 100% 0%, rgba(200, 145, 42, 0.16), transparent 62%),
    var(--ink);
}

.page-about .about-cta__text {
  margin: 0;
  max-width: 54ch;
  font-size: 16px;
  line-height: 1.85;
  color: rgba(244, 238, 226, 0.82);
}

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

.page-about .about-next__foot {
  margin: 26px 0 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--muted);
}

.page-about .about-next__link {
  color: var(--gold-bright);
}

/* ---------- 响应式 ---------- */
@media (min-width: 640px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 700px) {
  .page-about .clause-band {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 860px) {
  .page-about .channel-views {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .next-grid {
    grid-template-columns: repeat(2, 1fr);
  }
  .page-about .about-cta {
    grid-template-columns: 1fr auto;
    align-items: center;
  }
}

@media (min-width: 900px) {
  .page-about .lanes {
    grid-template-columns: 1fr 1fr;
    gap: 0;
  }
  .page-about .lane--gd {
    padding-right: clamp(22px, 3vw, 44px);
  }
  .page-about .lane--sh {
    padding-left: clamp(22px, 3vw, 44px);
    border-left: 1px solid var(--gold);
  }
}

@media (min-width: 980px) {
  .page-about .about-history__grid {
    grid-template-columns: var(--about-rail) 1fr;
  }
  .page-about .about-rail {
    position: sticky;
    top: 118px;
    align-self: start;
  }
  .page-about .team-roster li {
    grid-template-columns: 96px 1fr;
    gap: 26px;
  }
}

@media (min-width: 1024px) {
  .page-about .about-hero__stats {
    grid-template-columns: repeat(4, 1fr);
  }
}

@media (min-width: 1100px) {
  .page-about .clause-band {
    grid-template-columns: repeat(4, 1fr);
  }
}