.page-about {
  --pa-gold-soft: rgba(201, 164, 76, 0.18);
  --pa-white-70: rgba(247, 245, 240, 0.72);
  --pa-white-24: rgba(247, 245, 240, 0.24);
  --pa-gold-line: 3px solid var(--c-gold);
  display: block;
  min-height: 60vh;
  background: var(--c-white);
  color: var(--c-body-text);
  font-family: var(--font-sans);
}

.page-about__wrap {
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

/* ===== 首屏品牌声明区 ===== */
.page-about__intro {
  position: relative;
  overflow: hidden;
  background: var(--c-ink);
  color: var(--c-white);
  padding: clamp(32px, 6vw, 64px) 0 clamp(80px, 10vw, 150px);
}

.page-about__intro::before {
  content: "";
  position: absolute;
  width: 360px;
  height: 360px;
  border-radius: 50%;
  border: 1px solid var(--pa-gold-soft);
  top: -160px;
  right: -120px;
}

.page-about__intro::after {
  content: "";
  position: absolute;
  width: 200px;
  height: 200px;
  border-radius: 50%;
  border: 1px dashed var(--pa-white-24);
  bottom: -60px;
  right: 22%;
}

.page-about__intro-inner {
  position: relative;
  z-index: 2;
  max-width: var(--container-max);
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 48px);
}

.page-about__breadcrumb {
  margin-bottom: 28px;
}

.page-about__breadcrumb .breadcrumb__link {
  color: var(--pa-white-70);
}

.page-about__breadcrumb .breadcrumb__link:hover {
  color: var(--c-white);
}

.page-about__breadcrumb .breadcrumb__current {
  color: var(--c-gold);
}

.page-about__intro-grid {
  display: grid;
  gap: 40px;
  margin-top: 36px;
}

.page-about__eyebrow {
  margin: 0 0 10px;
  font-family: var(--font-serif);
  font-size: 13px;
  letter-spacing: 0.22em;
  color: var(--c-gold);
}

.page-about__title {
  margin: 0 0 18px;
  color: var(--c-white);
  font-size: clamp(26px, 4.6vw, 48px);
  line-height: 1.25;
  letter-spacing: -0.01em;
}

.page-about__lead {
  margin: 0 0 14px;
  max-width: 620px;
  font-size: clamp(15px, 2vw, 18px);
  line-height: 1.8;
  color: var(--pa-white-70);
}

.page-about__lead strong {
  color: var(--c-white);
  font-weight: 700;
}

.page-about__intro-note {
  margin: 0;
  max-width: 620px;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.5);
}

.page-about__stats {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  margin: 0;
}

.page-about__stat {
  margin: 0;
  padding-top: 14px;
  border-top: 2px solid rgba(201, 164, 76, 0.55);
}

.page-about__stat dt {
  margin-bottom: 6px;
  font-size: 12px;
  letter-spacing: 0.1em;
  color: rgba(247, 245, 240, 0.55);
}

.page-about__stat-num {
  margin: 0;
  font-size: clamp(30px, 5vw, 46px);
  font-weight: 900;
  line-height: 1.1;
  color: var(--c-white);
}

.page-about__stat-label {
  margin: 6px 0 0;
  font-size: 12.5px;
  line-height: 1.6;
  color: rgba(247, 245, 240, 0.5);
}

.page-about__jump {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-top: 32px;
  padding-top: 22px;
  border-top: 1px solid var(--pa-white-24);
}

.page-about__jump a {
  padding: 7px 14px;
  font-size: 13px;
  color: rgba(247, 245, 240, 0.78);
  text-decoration: none;
  border: 1px solid rgba(247, 245, 240, 0.22);
  border-radius: 999px;
  transition: color var(--ease), background var(--ease), border-color var(--ease);
}

.page-about__jump a:hover {
  color: var(--c-ink);
  background: var(--c-gold);
  border-color: var(--c-gold);
}

.page-about__intro-trust {
  margin: 18px 0 0;
  font-size: 13px;
  letter-spacing: 0.04em;
  color: rgba(247, 245, 240, 0.5);
}

.page-about__mountains {
  position: absolute;
  left: 0;
  bottom: 0;
  width: 100%;
  height: clamp(80px, 18vw, 220px);
  z-index: 1;
  pointer-events: none;
}

/* ===== 通用章节标题 ===== */
.page-about__section-head {
  margin: 0 0 clamp(28px, 5vw, 52px);
  padding-left: 16px;
  border-left: var(--pa-gold-line);
}

.page-about__section-head--split {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-end;
  justify-content: space-between;
  gap: 12px;
}

.page-about__sect-tag {
  margin: 0 0 8px;
  font-family: var(--font-serif);
  font-size: 12px;
  letter-spacing: 0.2em;
  color: var(--c-gold);
  text-transform: uppercase;
}

.page-about__sect-title {
  margin: 0;
  font-size: clamp(24px, 3.6vw, 38px);
  font-weight: 900;
  line-height: 1.3;
  color: var(--c-dark);
}

.page-about__sect-lead {
  margin: 12px 0 0;
  max-width: 680px;
  font-size: 15px;
  line-height: 1.8;
  color: var(--c-body-muted);
}

.page-about__sect-note {
  margin: 4px 0 0;
  font-size: 13px;
  color: var(--c-body-muted);
}

/* ===== 品牌起源与定位 ===== */
.page-about__origin {
  background: var(--c-white);
  padding: clamp(56px, 8vw, 104px) 0;
}

.page-about__origin-grid {
  display: grid;
  gap: 44px;
}

.page-about__origin-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
}

.page-about__origin-lead-text {
  font-family: var(--font-serif);
  font-size: 17px;
  color: var(--c-dark);
}

.page-about__origin-points {
  display: grid;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about__origin-points li {
  display: flex;
  align-items: baseline;
  gap: 12px;
  padding: 12px 14px;
  font-size: 14px;
  color: var(--c-body-text);
  background: var(--c-mist);
  border-radius: var(--radius-sm);
}

.page-about__origin-points li span {
  flex: 0 0 auto;
  font-family: var(--font-serif);
  font-size: 15px;
  font-weight: 600;
  color: var(--c-gold);
}

.page-about__origin-figure {
  position: relative;
  margin: 0;
}

.page-about__origin-figure::before {
  content: "";
  position: absolute;
  top: 14px;
  right: -14px;
  bottom: -14px;
  left: 14px;
  border: 1px solid var(--c-gold);
  border-radius: var(--radius-md);
  opacity: 0.5;
}

.page-about__origin-img {
  position: relative;
  z-index: 1;
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
}

.page-about__origin-figure figcaption {
  position: relative;
  z-index: 1;
  margin-top: 12px;
  font-size: 12.5px;
  color: var(--c-body-muted);
}

/* ===== 发展里程碑 ===== */
.page-about__milestone {
  background: var(--c-mist);
  padding: clamp(56px, 8vw, 96px) 0;
}

.page-about__timeline {
  display: flex;
  overflow-x: auto;
  scroll-snap-type: x proximity;
  padding: 6px 2px 18px;
  scrollbar-width: thin;
  scrollbar-color: var(--c-gold) rgba(11, 15, 26, 0.1);
  -webkit-overflow-scrolling: touch;
}

.page-about__timeline::-webkit-scrollbar {
  height: 6px;
}

.page-about__timeline::-webkit-scrollbar-track {
  background: rgba(11, 15, 26, 0.06);
  border-radius: 999px;
}

.page-about__timeline::-webkit-scrollbar-thumb {
  background: var(--c-gold);
  border-radius: 999px;
}

.page-about__tl-item {
  position: relative;
  flex: 0 0 clamp(230px, 64vw, 270px);
  scroll-snap-align: start;
  margin-right: 26px;
  padding-top: 20px;
  border-top: 2px solid var(--c-cloud);
}

.page-about__tl-item::before {
  content: "";
  position: absolute;
  top: -6px;
  left: 0;
  width: 11px;
  height: 11px;
  border-radius: 50%;
  background: var(--c-gold);
  box-shadow: 0 0 0 4px var(--c-mist);
}

.page-about__tl-year {
  display: block;
  margin-bottom: 6px;
  font-family: var(--font-serif);
  font-size: 34px;
  font-weight: 600;
  line-height: 1.1;
  color: var(--c-gold);
}

.page-about__tl-title {
  margin: 0 0 8px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-dark);
}

.page-about__tl-desc {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-body-muted);
}

.page-about__timeline-figure {
  margin: 30px 0 26px;
}

.page-about__timeline-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.page-about__timeline-figure figcaption {
  margin-top: 10px;
  font-size: 12.5px;
  color: var(--c-body-muted);
}

.page-about__more {
  padding: 0 20px;
  background: var(--c-white);
  border: var(--border-cloud);
  border-radius: var(--radius-md);
}

.page-about__more summary {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 12px;
  padding: 18px 0;
  font-size: 15px;
  font-weight: 700;
  color: var(--c-dark);
  cursor: pointer;
  list-style: none;
}

.page-about__more summary::-webkit-details-marker {
  display: none;
}

.page-about__more summary::after {
  content: "+";
  font-size: 22px;
  font-weight: 400;
  line-height: 1;
  color: var(--c-gold);
  transition: transform var(--ease);
}

.page-about__more[open] summary::after {
  content: "−";
}

.page-about__more-body {
  padding: 0 0 20px;
  font-size: 14px;
  line-height: 1.9;
  color: var(--c-body-text);
}

.page-about__more-body p {
  margin: 0 0 12px;
}

.page-about__more-body p:last-child {
  margin-bottom: 0;
}

.page-about__more-body a {
  color: var(--c-blue);
  text-decoration: underline;
}

/* ===== 资质与认证 ===== */
.page-about__cert {
  background: var(--c-dark);
  padding: clamp(56px, 8vw, 96px) 0;
}

.page-about__cert .page-about__sect-title {
  color: var(--c-white);
}

.page-about__cert .page-about__sect-lead {
  color: rgba(247, 245, 240, 0.6);
}

.page-about__cert-grid {
  display: grid;
  gap: 18px;
}

.page-about__cert-card {
  position: relative;
  padding: 26px 24px;
  background: rgba(247, 245, 240, 0.045);
  border: 1px solid rgba(201, 164, 76, 0.32);
  border-radius: var(--radius-md);
  transition: background var(--ease), border-color var(--ease), transform var(--ease);
}

.page-about__cert-card:hover {
  background: rgba(247, 245, 240, 0.07);
  border-color: var(--c-gold);
  transform: translateY(-2px);
}

.page-about__cert-icon {
  display: block;
  width: 34px;
  height: 34px;
  margin-bottom: 18px;
  color: var(--c-gold);
}

.page-about__cert-card h3 {
  display: flex;
  align-items: center;
  gap: 8px;
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  line-height: 1.5;
  color: var(--c-white);
}

.page-about__cert-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.66);
}

/* ===== 合作生态 ===== */
.page-about__partner {
  background: var(--c-white);
  padding: clamp(56px, 8vw, 96px) 0;
}

.page-about__partner-grid {
  display: grid;
  gap: 18px;
}

.page-about__partner-card {
  position: relative;
  padding: 26px 24px 28px;
  background: var(--c-white);
  border: 1px solid var(--c-cloud);
  border-left: 3px solid var(--c-blue);
  border-radius: var(--radius-sm) var(--radius-md) var(--radius-md) var(--radius-sm);
  box-shadow: var(--shadow-sm);
  transition: transform var(--ease), box-shadow var(--ease);
}

.page-about__partner-card:nth-child(2) {
  border-left-color: var(--c-green);
}

.page-about__partner-card:nth-child(3) {
  border-left-color: var(--c-gold);
}

.page-about__partner-card:hover {
  transform: translateY(-3px);
  box-shadow: var(--shadow-md);
}

.page-about__partner-num {
  display: block;
  margin-bottom: 14px;
  font-family: var(--font-serif);
  font-size: 30px;
  font-weight: 600;
  color: var(--c-gold);
}

.page-about__partner-title {
  margin: 0 0 10px;
  font-size: 17px;
  font-weight: 700;
  color: var(--c-dark);
}

.page-about__partner-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.8;
  color: var(--c-body-muted);
}

.page-about__partner-foot {
  margin: 30px 0 0;
  padding-top: 20px;
  font-size: 14px;
  color: var(--c-body-muted);
  border-top: 1px solid var(--c-cloud);
}

/* ===== 团队与文化 ===== */
.page-about__culture {
  background: var(--c-mist);
  padding: clamp(56px, 8vw, 96px) 0;
}

.page-about__culture-grid {
  display: grid;
  gap: 48px;
}

.page-about__culture-copy p {
  margin: 0 0 14px;
  font-size: 15px;
  line-height: 1.9;
  color: var(--c-body-text);
}

.page-about__culture-values {
  display: grid;
  grid-template-columns: 1fr;
  gap: 12px;
  margin: 22px 0 0;
  padding: 0;
  list-style: none;
}

.page-about__culture-values li {
  padding: 16px 18px;
  font-size: 14px;
  line-height: 1.7;
  color: var(--c-body-muted);
  background: var(--c-white);
  border: 1px solid rgba(184, 184, 168, 0.55);
  border-radius: var(--radius-sm);
  box-shadow: var(--shadow-sm);
}

.page-about__culture-values strong {
  display: block;
  margin-bottom: 5px;
  color: var(--c-dark);
  font-weight: 700;
}

.page-about__culture-values strong::before {
  content: "";
  display: inline-block;
  width: 8px;
  height: 8px;
  margin-right: 8px;
  border-radius: 1px;
  background: var(--c-gold);
}

.page-about__culture-values li:nth-child(2) strong::before {
  background: var(--c-blue);
}

.page-about__culture-values li:nth-child(3) strong::before {
  background: var(--c-green);
}

.page-about__culture-values li:nth-child(4) strong::before {
  background: var(--c-gold);
}

.page-about__culture-figure {
  margin: 0;
  padding: 10px;
  background: var(--c-white);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-sm);
}

.page-about__culture-figure img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-sm);
}

.page-about__culture-figure figcaption {
  padding: 12px 4px 4px;
  text-align: center;
  font-size: 12.5px;
  color: var(--c-body-muted);
}

/* ===== 底部行动区 ===== */
.page-about__cta {
  position: relative;
  overflow: hidden;
  padding: clamp(52px, 8vw, 84px) 0;
  background: var(--c-ink);
  text-align: center;
}

.page-about__cta::before {
  content: "";
  position: absolute;
  top: 0;
  left: 50%;
  width: 640px;
  height: 1px;
  background: linear-gradient(90deg, transparent, var(--c-gold), transparent);
  transform: translateX(-50%);
}

.page-about__cta-inner {
  position: relative;
  z-index: 1;
  max-width: 760px;
  margin: 0 auto;
  padding: 0 clamp(20px, 4vw, 40px);
}

.page-about__cta-title {
  margin: 0;
  font-size: clamp(22px, 3.2vw, 32px);
  font-weight: 900;
  color: var(--c-white);
}

.page-about__cta-desc {
  margin: 12px 0 26px;
  font-size: 15px;
  line-height: 1.8;
  color: rgba(247, 245, 240, 0.6);
}

.page-about__cta-links {
  display: flex;
  flex-wrap: wrap;
  justify-content: center;
  gap: 12px;
}

.page-about__cta-links .btn {
  min-width: 150px;
}

/* ===== 响应式增强 ===== */
@media (min-width: 640px) {
  .page-about__stats {
    grid-template-columns: repeat(3, 1fr);
    gap: 28px;
  }

  .page-about__culture-values {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 900px) {
  .page-about__origin-grid {
    grid-template-columns: 1.05fr 0.95fr;
    grid-template-areas: "figure copy";
    gap: 60px;
    align-items: center;
  }

  .page-about__origin-copy {
    grid-area: copy;
  }

  .page-about__origin-figure {
    grid-area: figure;
  }

  .page-about__cert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 22px;
  }

  .page-about__partner-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }

  .page-about__culture-grid {
    grid-template-columns: 1.05fr 0.95fr;
    gap: 64px;
    align-items: center;
  }
}

@media (min-width: 1100px) {
  .page-about__intro-grid {
    grid-template-columns: 7fr 5fr;
    gap: 64px;
    align-items: end;
  }

  .page-about__stats {
    grid-template-columns: 1fr;
    gap: 20px;
  }
}