.page-about {
  --about-card: rgba(255, 255, 255, 0.72);
  --about-radius: 12px;
  background: var(--paper);
  color: var(--ink);
  font-family: var(--font-body);
  overflow-x: clip;
}

.page-about p {
  margin: 0 0 1em;
}

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--font-head);
  font-weight: 600;
  letter-spacing: 0.02em;
  margin: 0 0 0.5em;
}

.page-about .mono {
  font-family: var(--font-mono);
}

/* ---------- 首屏 ---------- */
.page-about .about-hero {
  position: relative;
  isolation: isolate;
  overflow: hidden;
  padding: calc(var(--header-h) + 64px) 0 68px;
  background: linear-gradient(160deg, #16130F 0%, #2E2723 55%, #3A342E 100%);
  color: var(--paper);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: -16%;
  right: -28%;
  width: min(800px, 88vw);
  height: 152%;
  background: linear-gradient(135deg, rgba(158, 43, 37, 0.92), rgba(122, 31, 27, 0.74));
  clip-path: polygon(30% 0, 100% 0, 100% 100%, 0 82%);
  z-index: -1;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: 1px;
  background: linear-gradient(90deg, var(--gold), transparent 74%);
  z-index: -1;
}

.page-about .about-hero__inner {
  position: relative;
}

.page-about .about-hero .breadcrumbs {
  margin-bottom: 20px;
}

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

.page-about .about-hero .breadcrumb-item,
.page-about .about-hero .breadcrumb-sep {
  color: rgba(246, 241, 231, 0.68);
}

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

.page-about .about-hero__title {
  font-size: clamp(2rem, 5.6vw, 3.6rem);
  line-height: 1.2;
  max-width: 18em;
  color: var(--paper);
}

.page-about .about-hero__lead {
  max-width: 36em;
  font-size: 1.0625rem;
  line-height: 1.9;
  color: rgba(246, 241, 231, 0.82);
  margin: 18px 0 0;
}

.page-about .hero-facts {
  list-style: none;
  margin: 34px 0 30px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 16px 18px;
}

.page-about .hero-fact {
  border-left: 2px solid var(--gold);
  padding-left: 12px;
}

.page-about .hero-fact .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: clamp(1.4rem, 3.4vw, 1.8rem);
  line-height: 1.1;
  color: var(--paper);
}

.page-about .hero-fact small {
  display: block;
  margin-top: 4px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: rgba(246, 241, 231, 0.7);
}

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

/* ---------- 通用章节 ---------- */
.page-about .section-title {
  font-size: clamp(1.5rem, 3.4vw, 2.35rem);
  line-height: 1.28;
}

.page-about .section-lead {
  max-width: 40em;
  font-size: 1.0313rem;
  line-height: 1.85;
  color: var(--ink-2);
  margin: 0;
}

.page-about .section-head {
  margin-bottom: clamp(24px, 4vw, 42px);
}

.page-about .about-link {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 0.9375rem;
  font-weight: 600;
  color: var(--lacquer-red);
  border-bottom: 1px solid currentColor;
  padding-bottom: 2px;
  text-decoration: none;
}

.page-about .media-frame {
  margin: 0;
}

.page-about .media-frame img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: 10px;
  object-fit: cover;
}

.page-about .media-caption {
  margin-top: 10px;
  font-size: 0.8125rem;
  line-height: 1.7;
  color: var(--stone);
}

/* ---------- 品牌起源 ---------- */
.page-about .about-origin {
  background: var(--paper);
}

.page-about .about-split {
  display: grid;
  gap: 22px;
}

.page-about .about-split__body {
  max-width: 38em;
}

.page-about .about-split__body p {
  font-size: 1rem;
  line-height: 1.9;
  color: var(--ink-2);
}

.page-about .dropcap::first-letter {
  float: left;
  font-family: var(--font-head);
  font-size: 3.4em;
  line-height: 0.84;
  padding: 0.06em 0.14em 0 0;
  color: var(--lacquer-red);
}

.page-about .about-note {
  margin-top: 18px;
  padding-top: 14px;
  border-top: 1px solid var(--line);
  font-size: 0.9375rem;
  color: var(--ink-2);
}

/* ---------- 历程 ---------- */
.page-about .about-timeline {
  background: var(--paper);
}

.page-about .timeline-wrap {
  display: grid;
  gap: 26px;
}

.page-about .timeline-index ol {
  list-style: none;
  margin: 0;
  padding: 0 0 6px;
  display: flex;
  gap: 10px;
  overflow-x: auto;
}

.page-about .timeline-index li {
  flex: 0 0 auto;
}

.page-about .timeline-index a {
  display: block;
  padding: 8px 14px;
  border: 1px solid var(--line);
  border-radius: 999px;
  font-size: 0.8125rem;
  letter-spacing: 0.04em;
  color: var(--stone);
  text-decoration: none;
  white-space: nowrap;
}

.page-about .timeline-index a[data-active="true"] {
  color: var(--ink);
  border-color: var(--gold);
  background: rgba(201, 162, 39, 0.1);
}

.page-about .timeline-nodes {
  border-left: 1px solid var(--line);
  margin-left: 6px;
}

.page-about .timeline-node {
  position: relative;
  padding: 0 0 44px 24px;
}

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

.page-about .timeline-node::before {
  content: "";
  position: absolute;
  left: -6px;
  top: 8px;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--paper);
  border: 2px solid var(--gold);
  box-shadow: 0 0 0 4px rgba(201, 162, 39, 0.14);
}

.page-about .node-num {
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--lacquer-red);
}

.page-about .timeline-node h3 {
  font-size: 1.1875rem;
  margin: 6px 0 8px;
}

.page-about .timeline-node p {
  max-width: 38em;
  font-size: 0.9688rem;
  line-height: 1.85;
  color: var(--ink-2);
}

.page-about .timeline-node .media-frame {
  margin-top: 18px;
  max-width: 42em;
}

/* ---------- 四道流程 ---------- */
.page-about .about-flow {
  background: var(--paper-2);
}

.page-about .flow-top {
  display: grid;
  gap: 22px;
  margin-bottom: clamp(24px, 4vw, 40px);
}

.page-about .flow-top .section-head {
  margin-bottom: 0;
}

.page-about .flow-top__figure {
  max-width: 340px;
}

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

.page-about .flow-card {
  position: relative;
  background: var(--paper);
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  padding: 22px 20px;
  box-shadow: var(--shadow-card);
}

.page-about .flow-num {
  display: block;
  font-size: 2.25rem;
  line-height: 1;
  color: var(--lacquer-red);
}

.page-about .flow-card h3 {
  font-size: 1.125rem;
  margin: 12px 0 8px;
}

.page-about .flow-card > p {
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .flow-more {
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px dashed var(--line);
}

.page-about .flow-more summary {
  list-style: none;
  cursor: pointer;
  font-size: 0.8125rem;
  font-weight: 600;
  letter-spacing: 0.06em;
  color: var(--jade);
}

.page-about .flow-more summary::-webkit-details-marker {
  display: none;
}

.page-about .flow-more summary::after {
  content: " ＋";
}

.page-about .flow-more[open] summary::after {
  content: " －";
}

.page-about .flow-more p {
  margin: 8px 0 0;
  font-size: 0.875rem;
  line-height: 1.78;
  color: var(--ink-2);
}

.page-about .flow-foot {
  margin: 24px 0 0;
  padding-left: 14px;
  border-left: 3px solid var(--gold);
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-2);
}

/* ---------- 团队 ---------- */
.page-about .team-grid {
  display: grid;
  gap: 16px;
}

.page-about .team-card {
  background: var(--about-card);
  border: 1px solid var(--line);
  border-top: 3px solid var(--jade);
  border-radius: var(--about-radius);
  padding: 22px 20px;
}

.page-about .team-card:nth-child(2) {
  border-top-color: var(--clay);
}

.page-about .team-card:nth-child(3) {
  border-top-color: var(--lacquer-red);
}

.page-about .team-num {
  display: block;
  font-size: 2.25rem;
  line-height: 1;
  color: var(--ink);
}

.page-about .team-card h3 {
  font-size: 1.0625rem;
  margin: 10px 0 8px;
}

.page-about .team-card p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-2);
}

/* ---------- 资历 ---------- */
.page-about .about-cred {
  background: linear-gradient(160deg, #16130F 0%, #2E2723 55%, #3A342E 100%);
  color: var(--paper);
}

.page-about .about-cred .section-title {
  color: var(--paper);
}

.page-about .about-cred .section-lead {
  color: rgba(246, 241, 231, 0.76);
}

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

.page-about .cred-grid {
  display: grid;
  gap: 26px;
}

.page-about .seal-list {
  list-style: none;
  margin: 24px 0 0;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 16px;
}

.page-about .seal {
  width: 106px;
  height: 106px;
  border-radius: 50%;
  border: 1.5px solid var(--lacquer-red);
  background: rgba(158, 43, 37, 0.18);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  text-align: center;
  padding: 8px;
}

.page-about .seal-num {
  font-size: 1.5rem;
  line-height: 1;
  color: var(--gold-soft);
}

.page-about .seal small {
  display: block;
  margin-top: 6px;
  font-size: 0.6875rem;
  line-height: 1.4;
  letter-spacing: 0.04em;
  color: rgba(246, 241, 231, 0.74);
}

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

.page-about .cred-item {
  border: 1px solid rgba(228, 206, 134, 0.3);
  border-radius: var(--about-radius);
  padding: 20px;
  background: rgba(246, 241, 231, 0.04);
}

.page-about .cred-item h3 {
  margin: 0 0 8px;
  font-size: 1.0625rem;
  color: var(--gold-soft);
}

.page-about .cred-item p {
  margin: 0;
  font-size: 0.9375rem;
  line-height: 1.82;
  color: rgba(246, 241, 231, 0.8);
}

.page-about .cred-figure {
  margin-top: clamp(28px, 5vw, 48px);
}

.page-about .about-cred .media-caption {
  color: rgba(246, 241, 231, 0.62);
}

/* ---------- 服务半径 ---------- */
.page-about .about-reach {
  background: var(--paper);
}

.page-about .reach-grid {
  display: grid;
  gap: 28px;
}

.page-about .reach-stats {
  list-style: none;
  margin: 24px 0 20px;
  padding: 0;
  display: grid;
  grid-template-columns: repeat(2, minmax(0, 1fr));
  gap: 14px;
}

.page-about .reach-stat {
  border: 1px solid var(--line);
  border-radius: var(--about-radius);
  padding: 16px 18px;
  background: var(--about-card);
}

.page-about .reach-stat .stat-num {
  display: block;
  font-family: var(--font-mono);
  font-size: 1.9rem;
  line-height: 1.1;
  color: var(--lacquer-red);
}

.page-about .reach-stat small {
  display: block;
  margin-top: 6px;
  font-size: 0.8125rem;
  letter-spacing: 0.06em;
  color: var(--ink-2);
}

.page-about .reach-note {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: var(--ink-2);
  margin-bottom: 14px;
}

.page-about .chart-stack {
  display: grid;
  gap: 18px;
}

.page-about .chart-card {
  border: 1px solid var(--line);
  border-radius: 14px;
  padding: 18px;
  background: var(--paper);
  box-shadow: var(--shadow-card);
}

.page-about .chart-card h3 {
  margin: 0 0 14px;
  font-size: 0.9375rem;
  letter-spacing: 0.04em;
  color: var(--ink-2);
}

.page-about .chart-card svg {
  display: block;
  width: 100%;
  max-width: 260px;
  height: auto;
  margin: 0 auto;
}

.page-about .chart-num {
  font-family: var(--font-mono);
  font-size: 24px;
  fill: var(--ink);
}

.page-about .chart-label {
  font-family: var(--font-body);
  font-size: 11px;
  fill: var(--ink-2);
}

/* ---------- 开放日 ---------- */
.page-about .about-open {
  background: var(--paper);
}

.page-about .open-panel {
  display: grid;
  gap: 0;
  border: 1px solid var(--line);
  border-radius: 16px;
  overflow: hidden;
  background: var(--about-card);
  box-shadow: var(--shadow-card);
}

.page-about .open-panel__body {
  padding: clamp(24px, 4vw, 40px);
}

.page-about .open-panel__body p {
  max-width: 38em;
  font-size: 0.9688rem;
  line-height: 1.88;
  color: var(--ink-2);
}

.page-about .open-list {
  list-style: none;
  margin: 0 0 24px;
  padding: 0;
  display: grid;
  gap: 10px;
}

.page-about .open-list li {
  position: relative;
  padding-left: 22px;
  font-size: 0.9375rem;
  line-height: 1.8;
  color: var(--ink-2);
}

.page-about .open-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.62em;
  width: 9px;
  height: 9px;
  border-radius: 50%;
  background: var(--gold);
}

.page-about .open-panel__aside {
  padding: clamp(24px, 4vw, 40px);
  background: linear-gradient(160deg, #16130F 0%, #2E2723 100%);
  color: var(--paper);
}

.page-about .open-panel__aside h3 {
  font-size: 1.1875rem;
  color: var(--gold-soft);
  margin-bottom: 10px;
}

.page-about .open-panel__aside p {
  font-size: 0.9375rem;
  line-height: 1.85;
  color: rgba(246, 241, 231, 0.8);
  margin-bottom: 16px;
}

.page-about .open-panel__aside .about-link {
  color: var(--gold-soft);
}

/* ---------- 收尾 ---------- */
.page-about .about-closing {
  background: var(--paper-2);
}

.page-about .closing-band {
  display: flex;
  flex-direction: column;
  gap: 18px;
  align-items: flex-start;
  padding: clamp(22px, 3.4vw, 34px) 0;
  border-top: 2px solid var(--lacquer-red);
}

.page-about .closing-text {
  margin: 0;
  font-family: var(--font-head);
  font-size: clamp(1.125rem, 2.4vw, 1.5rem);
  line-height: 1.6;
  color: var(--ink);
}

.page-about .closing-actions {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 18px;
}

/* ---------- 响应式 ---------- */
@media (min-width: 720px) {
  .page-about .hero-facts {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 18px;
  }

  .page-about .flow-band {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }

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

  .page-about .closing-band {
    flex-direction: row;
    align-items: center;
    justify-content: space-between;
  }
}

@media (min-width: 900px) {
  .page-about .about-split {
    grid-template-columns: minmax(220px, 300px) minmax(0, 1fr);
    gap: clamp(32px, 6vw, 76px);
  }

  .page-about .flow-top {
    grid-template-columns: minmax(0, 1fr) minmax(260px, 340px);
    gap: clamp(30px, 5vw, 60px);
    align-items: center;
  }

  .page-about .team-grid {
    grid-template-columns: 31fr 22fr 15fr;
    gap: 18px;
  }

  .page-about .cred-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1.1fr);
    gap: clamp(30px, 5vw, 60px);
    align-items: start;
  }

  .page-about .open-panel {
    grid-template-columns: minmax(0, 1.55fr) minmax(0, 1fr);
  }
}

@media (min-width: 960px) {
  .page-about .reach-grid {
    grid-template-columns: minmax(0, 1fr) minmax(280px, 400px);
    gap: clamp(32px, 5vw, 64px);
    align-items: center;
  }
}

@media (min-width: 1024px) {
  .page-about .timeline-wrap {
    grid-template-columns: minmax(180px, 240px) minmax(0, 1fr);
    gap: clamp(32px, 5vw, 68px);
  }

  .page-about .timeline-index {
    position: sticky;
    top: calc(var(--header-h-solid) + 28px);
    align-self: start;
  }

  .page-about .timeline-index ol {
    flex-direction: column;
    gap: 2px;
    overflow: visible;
    padding-bottom: 0;
  }

  .page-about .timeline-index a {
    border: 0;
    border-left: 2px solid var(--line);
    border-radius: 0;
    padding: 10px 0 10px 14px;
    white-space: normal;
    background: none;
  }

  .page-about .timeline-index a[data-active="true"] {
    border-left-color: var(--gold);
    border-left-width: 3px;
    background: none;
    color: var(--ink);
  }

  .page-about .flow-band {
    grid-template-columns: repeat(4, minmax(0, 1fr));
    gap: 24px;
  }

  .page-about .flow-card:not(:last-child)::after {
    content: "";
    position: absolute;
    top: 54px;
    right: -24px;
    width: 24px;
    border-top: 1px dashed var(--stone);
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .flow-more summary::after {
    transition: none;
  }
}