.page-about {
  --ab-rail: 132px;
  --ab-line: rgba(36, 54, 95, 0.7);
  --ab-panel: linear-gradient(160deg, rgba(18, 34, 74, 0.92), rgba(11, 23, 48, 0.88));
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  padding: clamp(28px, 5vw, 64px) 0 clamp(34px, 4.6vw, 68px);
  background:
    radial-gradient(920px 540px at 80% 8%, rgba(53, 230, 210, 0.14), transparent 64%),
    radial-gradient(620px 420px at 6% 92%, rgba(242, 179, 61, 0.08), transparent 68%),
    linear-gradient(180deg, var(--ink-0), var(--ink-1));
  border-bottom: 1px solid var(--ab-line);
  overflow: hidden;
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  inset: 0;
  background-image: repeating-linear-gradient(90deg, rgba(53, 230, 210, 0.045) 0 1px, transparent 1px 84px);
  pointer-events: none;
}

.page-about .about-hero-grid {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 54px);
}

.page-about .about-hero-copy .breadcrumb {
  margin-bottom: 18px;
}

.page-about .about-hero-copy h1 {
  margin: 10px 0 0;
  font-family: var(--font-head);
  font-weight: 900;
  font-size: clamp(1.75rem, 5vw, 3.15rem);
  line-height: 1.16;
  letter-spacing: -0.01em;
  color: var(--text);
}

.page-about .about-lead {
  margin-top: 18px;
  max-width: 40em;
  font-size: clamp(0.95rem, 1.5vw, 1.05rem);
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 24px;
}

.page-about .about-hero-visual {
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about .about-hero-art {
  width: 100%;
  max-width: 620px;
  height: auto;
  display: block;
}

/* ---------- 首屏数据条 ---------- */
.page-about .about-stats {
  list-style: none;
  margin: clamp(30px, 4vw, 52px) 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-stat {
  background: var(--ink-1);
  padding: clamp(16px, 2.4vw, 24px) clamp(14px, 2vw, 22px);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-stat .stat-value {
  font-size: clamp(1.3rem, 2.6vw, 1.75rem);
  font-weight: 700;
  color: var(--cyan);
  line-height: 1.1;
}

.page-about .about-stat .stat-label {
  font-size: 0.82rem;
  color: var(--text-3);
  letter-spacing: 0.04em;
}

/* ---------- 主体骨架 ---------- */
.page-about .about-shell {
  padding: clamp(44px, 6vw, 88px) 0 clamp(56px, 7vw, 104px);
  background: var(--ink-0);
}

.page-about .about-shell-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(26px, 4vw, 52px);
}

.page-about .chapter-rail {
  display: none;
}

.page-about .chapter-rail-title {
  margin: 0 0 4px;
  font-family: var(--font-latin);
  font-size: 11px;
  letter-spacing: 0.28em;
  text-transform: uppercase;
  color: var(--text-3);
}

.page-about .chapter-rail-link {
  display: flex;
  align-items: baseline;
  gap: 8px;
  padding: 7px 0 7px 12px;
  border-left: 1px solid var(--line);
  font-size: 13px;
  line-height: 1.5;
  color: var(--text-3);
  text-decoration: none;
  transition: color var(--ease), border-color var(--ease);
}

.page-about .chapter-rail-link .mono {
  font-size: 11px;
  color: var(--text-3);
  opacity: 0.8;
}

.page-about .chapter-rail-link:hover {
  color: var(--text);
}

.page-about .chapter-rail-link[aria-current="location"] {
  color: var(--cyan);
  border-left-color: var(--cyan);
}

.page-about .chapter-rail-link[aria-current="location"] .mono {
  color: var(--cyan);
  opacity: 1;
}

/* ---------- 章节通用 ---------- */
.page-about .about-section {
  padding: clamp(30px, 4vw, 52px) 0;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-section:first-child {
  padding-top: 0;
  border-top: 0;
}

.page-about .about-section-head {
  margin-bottom: clamp(18px, 2.4vw, 28px);
}

.page-about .about-section-head .section-title {
  margin: 8px 0 0;
  font-family: var(--font-head);
  font-weight: 800;
  font-size: clamp(1.35rem, 3.2vw, 2.15rem);
  line-height: 1.25;
  color: var(--text);
}

.page-about .about-section-head .section-note {
  margin: 10px 0 0;
  font-size: 0.88rem;
  color: var(--text-3);
}

.page-about .about-text {
  margin: 0 0 18px;
  max-width: 42em;
  font-size: 0.95rem;
  line-height: 1.85;
  color: var(--text-2);
}

.page-about .about-text--tight {
  margin-bottom: 0;
}

.page-about .about-text a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 244, 234, 0.35);
}

.page-about .about-text a:hover {
  color: var(--cyan);
}

/* ---------- 服务对象 ---------- */
.page-about .about-persona {
  list-style: none;
  margin: 26px 0 0;
  padding: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}

.page-about .about-persona-item {
  position: relative;
  padding: 22px 20px 22px 24px;
  background: var(--ab-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .about-persona-item::before {
  content: "";
  position: absolute;
  left: 0;
  top: 20px;
  bottom: 20px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, var(--cyan), rgba(53, 230, 210, 0));
}

.page-about .about-persona-item:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 230, 210, 0.42);
  box-shadow: 0 20px 42px -26px rgba(53, 230, 210, 0.6);
}

.page-about .about-persona-tag {
  margin: 0 0 8px;
  font-size: 12px;
  letter-spacing: 0.16em;
  color: var(--gold);
}

.page-about .about-persona-item h3 {
  margin: 0 0 8px;
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-persona-item p {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.78;
  color: var(--text-2);
}

/* ---------- 图片容器 ---------- */
.page-about .about-figure {
  margin: 0 0 clamp(24px, 3vw, 34px);
}

.page-about .about-figure .media {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  overflow: hidden;
  background: var(--ink-1);
}

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

.page-about .about-figure .media-caption {
  display: block;
  margin-top: 10px;
  font-size: 0.78rem;
  letter-spacing: 0.06em;
  color: var(--text-3);
}

/* ---------- 时间轴 ---------- */
.page-about .about-timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  left: 13px;
  top: 14px;
  bottom: 14px;
  width: 2px;
  border-radius: 2px;
  background: linear-gradient(180deg, rgba(53, 230, 210, 0.9), rgba(53, 230, 210, 0.08));
}

.page-about .about-stage {
  position: relative;
  padding-left: 44px;
  padding-bottom: clamp(20px, 2.6vw, 30px);
}

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

.page-about .about-stage::before {
  content: "";
  position: absolute;
  left: 6px;
  top: 22px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ink-0);
  border: 2px solid var(--cyan);
  box-shadow: 0 0 0 4px rgba(53, 230, 210, 0.1), 0 0 18px rgba(53, 230, 210, 0.5);
}

.page-about .about-stage-card {
  padding: clamp(18px, 2.2vw, 26px);
  background: var(--ab-panel);
  border: 1px solid var(--line);
  border-radius: var(--radius);
  transition: transform var(--ease), border-color var(--ease), box-shadow var(--ease);
}

.page-about .about-stage-card:hover {
  transform: translateY(-4px);
  border-color: rgba(53, 230, 210, 0.42);
  box-shadow: 0 22px 46px -28px rgba(53, 230, 210, 0.6);
}

.page-about .about-stage-tag {
  margin: 0 0 8px;
  font-family: var(--font-latin);
  font-size: 12px;
  font-weight: 600;
  letter-spacing: 0.2em;
  text-transform: uppercase;
  color: var(--cyan-soft);
}

.page-about .about-stage-title {
  margin: 0 0 10px;
  font-family: var(--font-head);
  font-size: clamp(1.05rem, 2vw, 1.3rem);
  font-weight: 800;
  color: var(--text);
}

.page-about .about-stage-card > p {
  margin: 0 0 12px;
  font-size: 0.9rem;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-stage-points {
  margin: 0;
  padding: 0;
  list-style: none;
  display: grid;
  gap: 8px;
}

.page-about .about-stage-points li {
  position: relative;
  padding-left: 18px;
  font-size: 0.85rem;
  line-height: 1.7;
  color: var(--text-2);
}

.page-about .about-stage-points li::before {
  content: "";
  position: absolute;
  left: 2px;
  top: 0.62em;
  width: 7px;
  height: 7px;
  border-radius: 50%;
  background: var(--cyan);
  box-shadow: 0 0 10px rgba(53, 230, 210, 0.7);
}

.page-about .about-stage-link {
  display: inline-block;
  margin-top: 14px;
  font-size: 0.85rem;
  font-weight: 600;
  color: var(--gold);
  text-decoration: none;
  border-bottom: 1px solid rgba(242, 179, 61, 0.4);
  padding-bottom: 2px;
}

.page-about .about-stage-link:hover {
  color: var(--gold-deep);
}

/* ---------- V4 ---------- */
.page-about .about-v4-grid,
.page-about .about-team-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: clamp(22px, 3vw, 38px);
}

.page-about .about-v4-panels {
  display: grid;
  gap: 12px;
}

.page-about .about-v4-panel {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr);
  grid-template-areas:
    "idx title"
    "idx body";
  column-gap: 14px;
  padding: 18px 18px 18px 14px;
  background: var(--ink-1);
  border: 1px solid var(--line);
  border-left: 2px solid var(--gold);
  border-radius: 12px;
  transition: background var(--ease), border-color var(--ease);
}

.page-about .about-v4-panel:hover {
  background: var(--ink-2);
  border-left-color: var(--cyan);
}

.page-about .about-v4-index {
  grid-area: idx;
  margin: 0;
  font-size: 1.05rem;
  font-weight: 700;
  color: var(--gold);
  line-height: 1.4;
}

.page-about .about-v4-panel h3 {
  grid-area: title;
  margin: 0 0 6px;
  font-size: 1rem;
  font-weight: 700;
  color: var(--text);
}

.page-about .about-v4-panel p {
  grid-area: body;
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.78;
  color: var(--text-2);
}

.page-about .about-v4-foot {
  margin: 4px 0 0;
  font-size: 0.85rem;
  line-height: 1.8;
  color: var(--text-3);
}

.page-about .about-v4-foot a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 244, 234, 0.35);
}

.page-about .about-v4-foot a:hover {
  color: var(--cyan);
}

/* ---------- 团队 ---------- */
.page-about .about-team-copy .about-text:first-child {
  margin-top: 0;
}

.page-about .about-team-list {
  list-style: none;
  margin: 6px 0 20px;
  padding: 0;
  display: grid;
  gap: 1px;
  background: var(--ab-line);
  border: 1px solid var(--ab-line);
  border-radius: var(--radius);
  overflow: hidden;
}

.page-about .about-team-item {
  background: var(--ink-1);
  padding: 16px 18px;
}

.page-about .about-team-item h3 {
  margin: 0 0 6px;
  font-size: 0.95rem;
  font-weight: 700;
  color: var(--cyan-soft);
}

.page-about .about-team-item p {
  margin: 0;
  font-size: 0.86rem;
  line-height: 1.75;
  color: var(--text-2);
}

/* ---------- 服务地区 ---------- */
.page-about .about-metrics {
  list-style: none;
  margin: 8px 0 26px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 12px;
}

.page-about .about-metric {
  padding: 16px 16px 14px;
  border: 1px solid var(--line);
  border-top: 2px solid var(--cyan);
  border-radius: 12px;
  background: rgba(11, 23, 48, 0.7);
  display: flex;
  flex-direction: column;
  gap: 6px;
}

.page-about .about-metric .stat-value {
  font-size: 1.25rem;
  font-weight: 700;
  color: var(--text);
  line-height: 1.1;
}

.page-about .about-metric .stat-label {
  font-size: 0.78rem;
  color: var(--text-3);
  letter-spacing: 0.04em;
}

.page-about .about-facts {
  margin: 0 0 20px;
  padding: 0;
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-1);
  overflow: hidden;
}

.page-about .about-fact {
  display: grid;
  grid-template-columns: 1fr;
  gap: 4px;
  padding: 14px 18px;
  border-top: 1px solid var(--ab-line);
}

.page-about .about-fact:first-child {
  border-top: 0;
}

.page-about .about-fact dt {
  font-size: 0.78rem;
  letter-spacing: 0.08em;
  color: var(--text-3);
}

.page-about .about-fact dd {
  margin: 0;
  font-size: 0.9rem;
  line-height: 1.6;
  color: var(--text);
  word-break: break-word;
}

/* ---------- FAQ ---------- */
.page-about .about-faq {
  display: grid;
  gap: 10px;
}

.page-about .about-faq-item {
  border: 1px solid var(--line);
  border-radius: var(--radius);
  background: var(--ink-1);
  overflow: hidden;
  transition: border-color var(--ease), background var(--ease);
}

.page-about .about-faq-item:hover {
  border-color: rgba(53, 230, 210, 0.35);
}

.page-about .about-faq-item > summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  padding: 16px 18px;
  cursor: pointer;
  list-style: none;
  font-size: 0.95rem;
  font-weight: 700;
  line-height: 1.6;
  color: var(--text);
}

.page-about .about-faq-item > summary::-webkit-details-marker {
  display: none;
}

.page-about .about-faq-item > summary::after {
  content: "+";
  flex: none;
  font-family: var(--font-latin);
  font-size: 1.25rem;
  font-weight: 600;
  line-height: 1;
  color: var(--gold);
  transition: transform var(--ease);
}

.page-about .about-faq-item[open] > summary::after {
  transform: rotate(45deg);
}

.page-about .about-faq-body {
  padding: 0 18px 18px;
}

.page-about .about-faq-body p {
  margin: 0;
  font-size: 0.88rem;
  line-height: 1.8;
  color: var(--text-2);
}

.page-about .about-faq-body a {
  color: var(--cyan-soft);
  text-decoration: none;
  border-bottom: 1px solid rgba(143, 244, 234, 0.35);
}

.page-about .about-faq-body a:hover {
  color: var(--cyan);
}

/* ---------- 返回顶部 ---------- */
.page-about .to-top {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  font-family: var(--font-latin);
}

/* ---------- 响应式 ---------- */
@media (min-width: 620px) {
  .page-about .about-stats {
    grid-template-columns: repeat(4, minmax(0, 1fr));
  }

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

  .page-about .about-fact {
    grid-template-columns: 120px minmax(0, 1fr);
    align-items: baseline;
    gap: 16px;
  }
}

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

@media (min-width: 900px) {
  .page-about .about-v4-grid {
    grid-template-columns: minmax(0, 1.08fr) minmax(0, 0.92fr);
    align-items: start;
  }

  .page-about .about-figure--side {
    position: sticky;
    top: calc(var(--header-h) + 28px);
    margin-bottom: 0;
  }

  .page-about .about-team-grid {
    grid-template-columns: minmax(0, 0.86fr) minmax(0, 1.14fr);
    align-items: start;
  }
}

@media (min-width: 1180px) {
  .page-about .about-shell-inner {
    grid-template-columns: var(--ab-rail) minmax(0, 1fr);
    gap: clamp(30px, 3.4vw, 56px);
  }

  .page-about .chapter-rail {
    display: flex;
    flex-direction: column;
    gap: 2px;
    position: sticky;
    top: calc(var(--header-h) + 26px);
    align-self: start;
  }

  .page-about .about-section {
    padding: clamp(38px, 4.4vw, 60px) 0;
  }

  .page-about .about-timeline::before {
    left: 15px;
  }

  .page-about .about-stage {
    padding-left: 54px;
  }

  .page-about .about-stage::before {
    left: 8px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .about-persona-item,
  .page-about .about-stage-card,
  .page-about .about-v4-panel,
  .page-about .about-faq-item > summary::after {
    transition: none;
  }

  .page-about .about-persona-item:hover,
  .page-about .about-stage-card:hover {
    transform: none;
  }
}