.page-about {
  --about-rail-gap: 26px;
  --about-frame-pad: clamp(22px, 4vw, 48px);
  padding-bottom: clamp(40px, 7vw, 88px);
}

.page-about .breadcrumbs {
  padding-top: clamp(18px, 3vw, 30px);
}

/* ---------- 首屏框景 ---------- */
.page-about .about-hero {
  padding-top: clamp(14px, 2.5vw, 26px);
}

.page-about .about-hero__frame {
  position: relative;
  padding: var(--about-frame-pad);
  padding-top: calc(var(--about-frame-pad) + 10px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background:
    linear-gradient(180deg, rgba(253, 251, 246, 0.94), rgba(246, 241, 231, 0.62)),
    repeating-linear-gradient(90deg, rgba(11, 59, 74, 0.055) 0 1px, transparent 1px 46px);
  box-shadow: var(--shadow-2);
  overflow: hidden;
}

.page-about .about-hero__frame::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 12px;
  background-image: repeating-linear-gradient(90deg, var(--gold) 0 1px, transparent 1px 26px);
  opacity: 0.5;
}

.page-about .about-hero__grid {
  display: grid;
  gap: clamp(22px, 3.6vw, 42px);
}

.page-about .about-hero__copy h1 {
  margin: 14px 0 16px;
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.22;
  font-size: clamp(30px, 6vw, 52px);
  color: var(--ink);
}

.page-about .about-hero__copy .lede {
  margin: 0;
  max-width: 46ch;
  color: var(--text);
}

.page-about .about-hero__facts {
  display: grid;
  grid-template-columns: repeat(3, minmax(0, 1fr));
  gap: 1px;
  margin: 0;
  background: var(--line);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-fact {
  background: var(--card);
  padding: 14px 12px;
}

.page-about .about-fact dt {
  font-size: 12px;
  line-height: 1.5;
  color: var(--meta);
  letter-spacing: 0.02em;
}

.page-about .about-fact dd {
  margin: 8px 0 0;
  font-family: var(--mono);
  font-size: clamp(24px, 4vw, 32px);
  line-height: 1;
  color: var(--ink);
  letter-spacing: 0.02em;
}

@media (min-width: 860px) {
  .page-about .about-hero__grid {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
    align-items: end;
  }
}

/* ---------- 通用区块标题 ---------- */
.page-about .about-legacy,
.page-about .about-team,
.page-about .about-verify,
.page-about .about-reach,
.page-about .about-refresh,
.page-about .about-archive {
  padding-top: clamp(48px, 8vw, 96px);
}

.page-about .about-legacy h2,
.page-about .about-team h2,
.page-about .about-verify h2,
.page-about .about-reach h2,
.page-about .about-refresh h2,
.page-about .about-archive h2 {
  margin: 14px 0 14px;
  font-family: var(--serif);
  font-weight: 600;
  letter-spacing: -0.01em;
  line-height: 1.28;
  font-size: clamp(24px, 4vw, 34px);
  color: var(--ink);
  max-width: 24ch;
}

.page-about .about-legacy .lede,
.page-about .about-team .lede,
.page-about .about-refresh .lede {
  max-width: 62ch;
  margin: 0;
  color: var(--text);
}

/* ---------- 沿革图片 ---------- */
.page-about .figure {
  margin: 0;
  max-width: 100%;
}

.page-about .figure img {
  max-width: 100%;
  height: auto;
}

.page-about .about-legacy__figure {
  margin-top: clamp(24px, 4vw, 38px);
  aspect-ratio: 1440 / 620;
}

/* ---------- 里程碑横向刻度轴 ---------- */
.page-about .about-rail {
  display: flex;
  gap: var(--about-rail-gap);
  list-style: none;
  margin: clamp(28px, 4.5vw, 46px) 0 0;
  padding: 0 var(--about-rail-gap) 14px 0;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  -webkit-overflow-scrolling: touch;
}

.page-about .about-rail__stop {
  position: relative;
  flex: 0 0 auto;
  width: min(76vw, 296px);
  padding: 52px 0 0;
  scroll-snap-align: start;
}

.page-about .about-rail__stop::before {
  content: "";
  position: absolute;
  top: 22px;
  left: 0;
  width: calc(100% + var(--about-rail-gap));
  height: 1px;
  background: var(--line-strong);
}

.page-about .about-rail__year {
  position: absolute;
  top: 0;
  left: 0;
  font-size: 13px;
  letter-spacing: 0.06em;
  color: var(--meta);
}

.page-about .about-rail__mark {
  position: absolute;
  top: 17px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.18);
}

.page-about .about-rail__title {
  margin: 0 0 8px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
}

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

/* ---------- 深色窄幅注释带 ---------- */
.page-about .about-band {
  margin-top: clamp(40px, 7vw, 76px);
}

.page-about .about-band__inner {
  display: grid;
  gap: 14px;
  align-items: center;
  padding: clamp(24px, 4vw, 36px) clamp(20px, 3.6vw, 40px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(201, 162, 39, 0.35);
  background:
    radial-gradient(120% 160% at 0% 0%, rgba(27, 114, 136, 0.42), transparent 60%),
    var(--ink);
  color: var(--paper);
  box-shadow: var(--shadow-2);
}

.page-about .about-band__num {
  margin: 0;
  font-size: clamp(38px, 7vw, 60px);
  line-height: 1;
  color: var(--gold-hi);
  letter-spacing: 0.01em;
}

.page-about .about-band__num span {
  font-size: 0.45em;
  margin-left: 4px;
  color: var(--gold-hi);
}

.page-about .about-band__text {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.86);
}

@media (min-width: 800px) {
  .page-about .about-band__inner {
    grid-template-columns: minmax(140px, 0.28fr) minmax(0, 1fr);
    gap: 28px;
  }
}

/* ---------- 团队与分工：技能树式 ---------- */
.page-about .about-team__layout {
  display: grid;
  gap: clamp(28px, 4.5vw, 48px);
  margin-top: clamp(26px, 4vw, 40px);
}

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

.page-about .about-tree::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 12px;
  bottom: 20px;
  width: 1px;
  background: linear-gradient(180deg, var(--gold), var(--ink-3) 55%, rgba(27, 114, 136, 0));
}

.page-about .about-tree__node {
  position: relative;
  padding-bottom: 30px;
}

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

.page-about .about-tree__node::before {
  content: "";
  position: absolute;
  left: -25px;
  top: 8px;
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: var(--gold);
  box-shadow: 0 0 0 3px rgba(201, 162, 39, 0.18);
  transition: box-shadow 180ms ease;
}

.page-about .about-tree__node::after {
  content: "";
  position: absolute;
  left: -15px;
  top: 12px;
  width: 15px;
  height: 1px;
  background: var(--line-strong);
}

.page-about .about-tree__role {
  margin: 0 0 6px;
  font-family: var(--serif);
  font-size: 19px;
  font-weight: 600;
  line-height: 1.4;
  color: var(--ink);
  transition: color 180ms ease;
}

.page-about .about-tree__num {
  margin: 0 0 8px;
  font-size: 14px;
  letter-spacing: 0.06em;
  color: var(--gold);
}

.page-about .about-tree__desc {
  margin: 0;
  font-size: 15px;
  line-height: 1.82;
  color: var(--text);
}

.page-about .about-tree__node:hover::before {
  box-shadow: 0 0 0 6px rgba(201, 162, 39, 0.24);
}

.page-about .about-tree__node:hover .about-tree__role {
  color: var(--ink-3);
}

.page-about .about-team__figure {
  aspect-ratio: 10 / 7;
}

.page-about .about-team__figure .figure-caption {
  color: var(--meta);
}

@media (min-width: 900px) {
  .page-about .about-team__layout {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.86fr);
    align-items: start;
  }
}

/* ---------- 兼容性验证 ---------- */
.page-about .about-verify__inner {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: center;
}

.page-about .about-verify__copy p {
  margin: 0 0 1.1em;
  font-size: 16px;
  line-height: 1.85;
  color: var(--text);
  max-width: 56ch;
}

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

.page-about .about-verify__figure {
  aspect-ratio: 3 / 2;
  border-radius: var(--radius-lg);
}

@media (min-width: 900px) {
  .page-about .about-verify__inner {
    grid-template-columns: minmax(0, 1.05fr) minmax(0, 0.95fr);
  }
}

/* ---------- 服务覆盖数字卡 ---------- */
.page-about .about-stats {
  display: grid;
  gap: 14px;
  list-style: none;
  margin: clamp(24px, 4vw, 38px) 0 0;
  padding: 0;
}

.page-about .about-stat {
  padding: 22px 20px 20px;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--card);
  box-shadow: var(--shadow-1);
  border-top: 2px solid var(--gold);
}

.page-about .about-stat__num {
  margin: 0;
  font-size: clamp(34px, 6vw, 44px);
  line-height: 1;
  color: var(--ink);
  letter-spacing: 0.01em;
}

.page-about .about-stat__num span {
  font-size: 0.46em;
  margin-left: 3px;
  color: var(--ink-3);
}

.page-about .about-stat__label {
  margin: 12px 0 0;
  font-size: 14px;
  line-height: 1.6;
  color: var(--meta);
}

.page-about .about-reach__note {
  margin-top: clamp(26px, 4vw, 40px);
  padding: clamp(22px, 3.4vw, 32px);
  border: 1px solid var(--line);
  border-left: 3px solid var(--gold);
  border-radius: var(--radius);
  background: linear-gradient(180deg, rgba(253, 251, 246, 0.9), rgba(246, 241, 231, 0.55));
}

.page-about .about-reach__note h3 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
}

.page-about .about-reach__note p {
  margin: 0 0 0.9em;
  font-size: 15px;
  line-height: 1.85;
  color: var(--text);
  max-width: 68ch;
}

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

.page-about .about-reach__note a {
  color: var(--ink-3);
  text-decoration: underline;
  text-underline-offset: 3px;
}

.page-about .about-reach__note a:hover {
  color: var(--ink);
}

@media (min-width: 760px) {
  .page-about .about-stats {
    grid-template-columns: repeat(3, minmax(0, 1fr));
    gap: 16px;
  }
}

/* ---------- 改版前后对照 ---------- */
.page-about .about-refresh__grid {
  display: grid;
  gap: 16px;
  margin-top: clamp(26px, 4vw, 40px);
}

.page-about .about-refresh__col {
  padding: clamp(22px, 3.4vw, 30px);
  border: 1px solid var(--line);
  border-radius: var(--radius-lg);
  background: var(--card);
  box-shadow: var(--shadow-1);
}

.page-about .about-refresh__col--changed {
  border-top: 3px solid var(--brick);
}

.page-about .about-refresh__col--kept {
  border-top: 3px solid var(--gold);
  background: linear-gradient(180deg, rgba(230, 203, 110, 0.14), rgba(253, 251, 246, 0.96));
}

.page-about .about-refresh__col h3 {
  margin: 0 0 16px;
  font-family: var(--serif);
  font-size: 20px;
  font-weight: 600;
  color: var(--ink);
}

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

.page-about .about-refresh__col li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--text);
}

.page-about .about-refresh__col li:last-child {
  margin-bottom: 0;
}

.page-about .about-refresh__col--changed li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 10px;
  height: 1px;
  background: var(--brick);
}

.page-about .about-refresh__col--kept li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 10px;
  width: 8px;
  height: 8px;
  border-radius: 50%;
  background: var(--gold);
}

@media (min-width: 820px) {
  .page-about .about-refresh__grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
    gap: 20px;
  }
}

/* ---------- 长期维护 ---------- */
.page-about .about-archive__inner {
  display: grid;
  gap: clamp(26px, 4vw, 44px);
  align-items: start;
}

.page-about .about-archive__copy p {
  margin: 0 0 1.05em;
  font-size: 16px;
  line-height: 1.86;
  color: var(--text);
  max-width: 58ch;
}

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

.page-about .about-archive__panel {
  padding: clamp(22px, 3.4vw, 30px);
  border: 1px solid var(--line-strong);
  border-radius: var(--radius-lg);
  background: linear-gradient(180deg, rgba(11, 59, 74, 0.04), rgba(253, 251, 246, 0.98));
  box-shadow: var(--shadow-1);
}

.page-about .about-archive__panel-title {
  margin: 0 0 18px;
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--meta);
}

.page-about .about-archive__list {
  list-style: none;
  margin: 0 0 22px;
  padding: 0;
}

.page-about .about-archive__list li {
  padding: 11px 0;
  border-bottom: 1px dashed var(--line);
  font-size: 15px;
  line-height: 1.7;
  color: var(--text);
}

.page-about .about-archive__list li:last-child {
  border-bottom: 0;
}

.page-about .about-archive__list .mono {
  display: inline-block;
  min-width: 4.6em;
  color: var(--ink);
  font-size: 14px;
}

.page-about .about-archive__link {
  display: inline-block;
  font-size: 15px;
  color: var(--ink-3);
  text-decoration: none;
  border-bottom: 1px solid var(--line-strong);
  padding-bottom: 2px;
  transition: color 180ms ease, border-color 180ms ease;
}

.page-about .about-archive__link:hover,
.page-about .about-archive__link:focus-visible {
  color: var(--ink);
  border-color: var(--gold);
}

@media (min-width: 900px) {
  .page-about .about-archive__inner {
    grid-template-columns: minmax(0, 1.3fr) minmax(0, 0.85fr);
  }
}

/* ---------- 收尾行动条 ---------- */
.page-about .about-cta {
  padding-top: clamp(48px, 8vw, 92px);
}

.page-about .about-cta__panel {
  display: grid;
  gap: 24px;
  padding: clamp(26px, 4.2vw, 44px);
  border-radius: var(--radius-lg);
  border: 1px solid rgba(201, 162, 39, 0.35);
  background:
    radial-gradient(100% 140% at 100% 0%, rgba(27, 114, 136, 0.4), transparent 62%),
    var(--ink-2);
  color: var(--paper);
  box-shadow: var(--shadow-2);
}

.page-about .about-cta__text h2 {
  margin: 0 0 12px;
  font-family: var(--serif);
  font-size: clamp(22px, 3.6vw, 30px);
  font-weight: 600;
  line-height: 1.35;
  color: var(--paper);
  max-width: 26ch;
}

.page-about .about-cta__text p {
  margin: 0;
  font-size: 15px;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.82);
  max-width: 60ch;
}

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

@media (min-width: 880px) {
  .page-about .about-cta__panel {
    grid-template-columns: minmax(0, 1.4fr) minmax(0, auto);
    align-items: center;
    gap: 36px;
  }

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

@media (prefers-reduced-motion: reduce) {
  .page-about .about-tree__node::before,
  .page-about .about-tree__role,
  .page-about .about-archive__link {
    transition: none;
  }
}