.page-about {
  --about-rail-w: 236px;
  --about-sticky-top: 104px;
}

/* ---------- 面包屑 ---------- */
.page-about .about-head-strip {
  padding-top: calc(var(--header-h) + 18px);
}

.page-about .about-crumb {
  display: flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  line-height: 1.6;
  color: rgba(245, 242, 234, .5);
}

.page-about .about-crumb a {
  color: rgba(245, 242, 234, .74);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: color var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-crumb a:hover,
.page-about .about-crumb a:focus-visible {
  color: var(--gold-soft);
  border-bottom-color: var(--line-gold-strong);
}

.page-about .about-crumb-sep {
  color: var(--line-gold-strong);
}

.page-about .about-crumb [aria-current="page"] {
  color: var(--gold);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding: clamp(26px, 3.4vw, 42px) 0 clamp(40px, 6vw, 80px);
}

.page-about .about-hero-frame {
  padding: clamp(22px, 3.6vw, 46px);
  display: grid;
  gap: clamp(16px, 2.2vw, 24px);
  align-content: start;
}

.page-about .about-hero .eyebrow {
  color: var(--gold-soft);
}

.page-about .about-hero-title {
  margin: 0;
  max-width: 22ch;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: clamp(1.85rem, 5.4vw, 3.4rem);
  line-height: 1.2;
  letter-spacing: -.01em;
  color: var(--moon);
}

.page-about .about-hero-lead {
  margin: 0;
  max-width: 64ch;
  font-size: clamp(15px, 1.4vw, 17px);
  line-height: 1.85;
  color: rgba(245, 242, 234, .78);
}

.page-about .about-hero-facts {
  margin-top: 4px;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line-gold);
  background: var(--line-gold);
}

.page-about .about-fact {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 16px 16px 18px;
  background: rgba(11, 23, 48, .92);
}

.page-about .about-fact-num {
  font-size: clamp(19px, 2.4vw, 26px);
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--gold);
}

.page-about .about-fact-label {
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: .04em;
  color: rgba(245, 242, 234, .58);
}

/* ---------- 主体分屏 ---------- */
.page-about .about-body {
  padding: clamp(44px, 6vw, 88px) 0 clamp(48px, 7vw, 100px);
}

.page-about .about-shell {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(30px, 4vw, 54px);
}

/* ---------- 左侧章节轨道 ---------- */
.page-about .about-rail {
  min-width: 0;
}

.page-about .about-rail-title {
  margin: 0 0 12px;
  font-size: 12.5px;
  line-height: 1.5;
  letter-spacing: .1em;
  color: var(--cloud);
}

.page-about .about-rail-nav {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 2px;
}

.page-about .about-rail-link {
  display: flex;
  align-items: baseline;
  gap: 10px;
  padding: 9px 12px 9px 14px;
  border-left: 1px solid var(--line-cool);
  font-size: 14.5px;
  line-height: 1.5;
  color: var(--ink-2);
  text-decoration: none;
  transition: color var(--dur) var(--ease), background var(--dur) var(--ease), border-color var(--dur) var(--ease);
}

.page-about .about-rail-link .mono {
  font-size: 11.5px;
  letter-spacing: .05em;
  color: var(--cloud);
}

.page-about .about-rail-link:hover,
.page-about .about-rail-link:focus-visible {
  color: var(--ink);
  background: rgba(217, 165, 68, .1);
  border-left-color: var(--gold);
}

.page-about .about-rail-link[aria-current] {
  color: var(--ink);
  background: rgba(217, 165, 68, .12);
  border-left-color: var(--gold);
}

.page-about .about-rail-link[aria-current] .mono {
  color: var(--cinnabar);
}

/* ---------- 右侧叙事流 ---------- */
.page-about .about-flow {
  display: grid;
  gap: clamp(40px, 5.4vw, 76px);
  min-width: 0;
}

.page-about .about-block {
  min-width: 0;
  scroll-margin-top: 96px;
}

.page-about .about-block-head {
  margin-bottom: clamp(18px, 2.4vw, 26px);
  padding-top: 16px;
  border-top: 1px solid var(--line-gold-strong);
}

.page-about .about-flow .eyebrow {
  color: var(--cloud);
}

.page-about .about-block-title {
  margin: 10px 0 0;
  max-width: 26ch;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.3rem, 2.8vw, 1.85rem);
  line-height: 1.32;
  letter-spacing: -.01em;
  color: var(--ink);
}

.page-about .about-block-desc {
  margin: 12px 0 0;
  max-width: 62ch;
  font-size: 15px;
  line-height: 1.8;
  color: var(--cloud);
}

.page-about .about-flow .prose p {
  margin: 0 0 16px;
  max-width: 68ch;
  font-size: 15.5px;
  line-height: 1.85;
  color: var(--ink-black);
}

.page-about .about-flow .prose p:last-child {
  margin-bottom: 0;
}

.page-about .about-dropcap::first-letter {
  float: left;
  margin: 6px 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 900;
  font-size: 3.1em;
  line-height: .82;
  color: var(--gold);
}

/* ---------- 图片 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(20px, 2.6vw, 28px);
  min-width: 0;
}

.page-about .about-figure .img-frame {
  width: 100%;
}

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

.page-about .about-figcap {
  margin-top: 10px;
  font-size: 12.5px;
  line-height: 1.6;
  letter-spacing: .02em;
  color: var(--cloud);
}

/* ---------- 版本阶段 ---------- */
.page-about .about-stages {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: 12px;
}

.page-about .about-stage {
  display: grid;
  gap: 8px;
  padding: 18px 20px 20px;
  background: var(--silver);
  border: 1px solid var(--line-cool);
  border-left: 2px solid var(--gold);
  border-radius: var(--radius);
  transition: transform var(--dur) var(--ease), box-shadow var(--dur) var(--ease),
    border-color var(--dur) var(--ease), background var(--dur) var(--ease);
}

@media (hover: hover) {
  .page-about .about-stage:hover {
    transform: translateY(-2px);
    border-color: var(--line-gold-strong);
    background: var(--moon);
    box-shadow: 0 12px 30px rgba(217, 165, 68, .14);
  }
}

.page-about .about-stage-meta {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0;
}

.page-about .about-stage-dot {
  flex: none;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(217, 165, 68, .16);
}

.page-about .about-stage-ver {
  font-size: 13px;
  letter-spacing: .06em;
  color: var(--cinnabar);
}

.page-about .about-stage-name {
  margin: 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.08rem;
  line-height: 1.4;
  color: var(--ink);
}

.page-about .about-stage-text {
  margin: 0;
  font-size: 14.5px;
  line-height: 1.78;
  color: var(--ink-black);
}

/* ---------- 服务覆盖 ---------- */
.page-about .about-map {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 34px);
  align-items: start;
}

.page-about .about-map .about-figure {
  margin-bottom: 0;
}

.page-about .about-map-text p {
  margin: 0 0 14px;
}

.page-about .about-map-text p:last-child {
  margin-bottom: 0;
}

.page-about .about-stats {
  margin: clamp(22px, 3vw, 30px) 0 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  border: 1px solid var(--line-cool);
  background: var(--line-cool);
}

.page-about .about-stat {
  display: flex;
  flex-direction: column;
  gap: 6px;
  padding: 14px 16px 16px;
  background: var(--moon);
}

.page-about .about-stat dt {
  font-size: 12.5px;
  line-height: 1.5;
  color: var(--cloud);
}

.page-about .about-stat dd {
  margin: 0;
  font-size: clamp(19px, 2.2vw, 24px);
  line-height: 1.2;
  letter-spacing: .02em;
  color: var(--ink-2);
}

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

.page-about .about-team .about-figure {
  margin-bottom: 0;
}

.page-about .about-team-text p {
  margin: 0 0 14px;
}

.page-about .about-team-text p:last-child {
  margin-bottom: 0;
}

/* ---------- 更新节奏 ---------- */
.page-about .about-cycle {
  list-style: none;
  margin: 0;
  padding: 0;
  border-top: 1px solid var(--line-cool);
}

.page-about .about-cycle-item {
  display: grid;
  grid-template-columns: 46px minmax(0, 1fr);
  gap: 14px;
  padding: 18px 0;
  border-bottom: 1px solid var(--line-cool);
}

.page-about .about-cycle-num {
  display: grid;
  place-items: center;
  width: 34px;
  height: 34px;
  border-radius: 50%;
  background: var(--cinnabar);
  color: var(--moon);
  font-size: 12.5px;
  letter-spacing: .04em;
}

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

.page-about .about-cycle-title {
  margin: 0 0 6px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: 1.02rem;
  line-height: 1.45;
  color: var(--ink);
}

.page-about .about-cycle-body p {
  margin: 0;
  max-width: 62ch;
  font-size: 14.5px;
  line-height: 1.8;
  color: var(--ink-black);
}

/* ---------- 长期服务表现 ---------- */
.page-about .about-trust {
  position: relative;
  overflow: hidden;
  padding: clamp(24px, 3.6vw, 42px);
  border: 1px solid var(--line-gold);
  border-radius: var(--radius);
  background: linear-gradient(160deg, var(--ink) 0%, var(--ink-2) 100%);
}

.page-about .about-trust::after {
  content: "";
  position: absolute;
  right: -80px;
  bottom: -80px;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(217, 165, 68, .22), transparent 70%);
  pointer-events: none;
}

.page-about .about-trust-head {
  margin-bottom: 22px;
}

.page-about .about-trust .eyebrow {
  color: var(--gold-soft);
}

.page-about .about-trust-title {
  margin: 10px 0 0;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.25rem, 2.6vw, 1.75rem);
  line-height: 1.35;
  color: var(--moon);
}

.page-about .about-trust-list {
  list-style: none;
  margin: 0 0 26px;
  padding: 0;
  display: grid;
  gap: 16px;
}

.page-about .about-trust-list li {
  display: grid;
  grid-template-columns: 14px minmax(0, 1fr);
  gap: 12px;
  align-items: start;
}

.page-about .about-trust-mark {
  margin-top: 7px;
  width: 8px;
  height: 8px;
  border: 1px solid var(--gold);
  transform: rotate(45deg);
}

.page-about .about-trust-list strong {
  display: block;
  margin-bottom: 4px;
  font-family: var(--font-serif);
  font-weight: 700;
  font-size: 15px;
  line-height: 1.5;
  color: var(--gold-soft);
}

.page-about .about-trust-text {
  display: block;
  font-size: 14.5px;
  line-height: 1.78;
  color: rgba(245, 242, 234, .76);
}

.page-about .about-trust-actions {
  position: relative;
  z-index: 1;
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 页尾行动区 ---------- */
.page-about .about-cta {
  padding: clamp(44px, 6vw, 84px) 0;
}

.page-about .about-cta .eyebrow {
  color: var(--gold-soft);
}

.page-about .about-cta-inner {
  display: grid;
  grid-template-columns: minmax(0, 1fr);
  gap: clamp(22px, 3vw, 36px);
  align-items: center;
}

.page-about .about-cta-title {
  margin: 10px 0 12px;
  font-family: var(--font-serif);
  font-weight: 800;
  font-size: clamp(1.25rem, 2.8vw, 1.85rem);
  line-height: 1.35;
  letter-spacing: -.01em;
  color: var(--moon);
}

.page-about .about-cta-text {
  margin: 0;
  max-width: 58ch;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(245, 242, 234, .74);
}

.page-about .about-cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

/* ---------- 断点 ---------- */
@media (min-width: 560px) and (max-width: 979px) {
  .page-about .about-rail-nav {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

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

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

@media (min-width: 640px) {
  .page-about .about-cycle-item {
    grid-template-columns: 62px minmax(0, 1fr);
    gap: 20px;
    padding: 22px 0;
  }
}

@media (min-width: 760px) {
  .page-about .about-stages {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 16px;
  }
}

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

  .page-about .about-team {
    grid-template-columns: minmax(0, .85fr) minmax(0, 1.15fr);
  }

  .page-about .about-cta-inner {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, 1fr);
  }

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

@media (min-width: 980px) {
  .page-about .about-shell {
    grid-template-columns: var(--about-rail-w) minmax(0, 1fr);
    gap: clamp(36px, 4.6vw, 64px);
  }

  .page-about .about-rail {
    position: sticky;
    top: var(--about-sticky-top);
    align-self: start;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-stage,
  .page-about .about-rail-link,
  .page-about .about-crumb a {
    transition: none;
  }

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