.page-about {
  --about-bg-navy: #0A1E3F;
  --about-bg-deep: #07152E;
  --about-blue: #143A6B;
  --about-gold: #C9A96E;
  --about-orange: #FF6A00;
  --about-light: #F5F7FA;
  --about-line: rgba(201, 169, 110, 0.35);
  --about-gold-soft: rgba(201, 169, 110, 0.22);
  --about-muted: rgba(255, 255, 255, 0.76);
  --about-card-shadow: 8px 8px 0 rgba(201, 169, 110, 0.28);

  background: var(--about-bg-navy);
  color: #FFFFFF;
  position: relative;
  overflow: clip;
}

/* ===== 通用区块标题 ===== */
.page-about__section-head {
  display: flex;
  align-items: flex-start;
  gap: 20px;
  margin-bottom: 48px;
  position: relative;
}

.page-about__section-head-text {
  padding-left: 4px;
}

.page-about__section-head-text p {
  color: var(--about-muted);
  font-size: 16px;
  line-height: 1.8;
  margin: 14px 0 0;
  max-width: 560px;
}

.page-about__section-head h2 {
  margin: 12px 0 0;
  font-size: 32px;
  font-weight: 900;
  color: #FFFFFF;
  letter-spacing: 0.02em;
}

.page-about__section-index {
  display: block;
  font-family: var(--yz-font-heading);
  font-weight: 900;
  font-size: 88px;
  line-height: 0.9;
  color: transparent;
  -webkit-text-stroke: 2px rgba(201, 169, 110, 0.62);
  text-stroke: 2px rgba(201, 169, 110, 0.62);
  white-space: nowrap;
}

/* ===== 面包屑 ===== */
.page-about__breadcrumb {
  margin-bottom: 32px;
  color: var(--about-muted);
}

.page-about__breadcrumb .yz-breadcrumb__link {
  color: var(--about-gold);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.25s ease;
}

.page-about__breadcrumb .yz-breadcrumb__link:hover {
  border-bottom-color: var(--about-gold);
}

.page-about__breadcrumb .yz-breadcrumb__sep {
  margin: 0 8px;
  color: rgba(255, 255, 255, 0.5);
}

/* ===== 01 品牌缘起 · Hero ===== */
.page-about__origin {
  padding: 40px 0 72px;
  background:
    radial-gradient(ellipse at 85% 8%, rgba(201, 169, 110, 0.14) 0%, transparent 54%),
    radial-gradient(ellipse at 105% 55%, rgba(20, 58, 107, 0.9) 0%, transparent 58%),
    var(--about-bg-navy);
  position: relative;
}

.page-about__hero {
  display: flex;
  flex-wrap: wrap;
  align-items: flex-start;
  justify-content: space-between;
  gap: 28px;
  margin-bottom: 44px;
}

.page-about__hero-lead {
  flex: 1 1 320px;
  min-width: 280px;
}

.page-about__hero-kicker {
  display: inline-block;
  margin-bottom: 16px;
}

.page-about__hero-lead h1 {
  margin: 0;
  font-size: 34px;
  line-height: 1.22;
  font-weight: 900;
  letter-spacing: 0.02em;
  color: #FFFFFF;
}

.page-about__hero-desc {
  margin: 22px 0 0;
  max-width: 560px;
  color: var(--about-muted);
  font-size: 16px;
  line-height: 1.9;
}

.page-about__hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-top: 28px;
}

.page-about__hero-actions .yz-btn {
  font-size: 15px;
}

.page-about__chapter-preview {
  flex: 0 1 260px;
  margin: 24px 0 0;
  padding: 18px 20px;
  border: 2px solid var(--about-line);
  background: rgba(20, 58, 107, 0.4);
}

.page-about__chapter-preview-title {
  display: block;
  font-family: var(--yz-font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  color: var(--about-gold);
  margin-bottom: 14px;
}

.page-about__chapter-list {
  list-style: none;
  margin: 0;
  padding: 0;
}

.page-about__chapter-list li + li {
  margin-top: 10px;
}

.page-about__chapter-list a {
  color: rgba(255, 255, 255, 0.86);
  font-family: var(--yz-font-heading);
  font-weight: 700;
  text-decoration: none;
  font-size: 14px;
  letter-spacing: 0.04em;
  border-bottom: 1px solid rgba(201, 169, 110, 0.4);
  padding-bottom: 3px;
  transition: color 0.25s ease, border-color 0.25s ease;
}

.page-about__chapter-list a:hover {
  color: var(--about-gold);
  border-bottom-color: var(--about-gold);
}

/* ===== 数据摘要 ===== */
.page-about__hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-bottom: 56px;
}

.page-about__stat {
  border: 2px solid rgba(255, 255, 255, 0.28);
  background: rgba(20, 58, 107, 0.28);
  padding: 18px 12px;
  text-align: center;
  transition: border-color 0.25s ease, transform 0.25s ease;
}

.page-about__stat:hover {
  border-color: var(--about-gold);
  transform: translateY(-2px);
}

.page-about__stat-num {
  display: block;
  font-family: var(--yz-font-heading);
  font-weight: 900;
  font-size: 28px;
  color: var(--about-gold);
  line-height: 1.1;
}

.page-about__stat-label {
  display: block;
  margin-top: 8px;
  font-family: var(--yz-font-body);
  font-size: 13px;
  color: rgba(255, 255, 255, 0.68);
}

/* ===== 品牌缘起正文 ===== */
.page-about__origin-content {
  position: relative;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

.page-about__glyph {
  position: absolute;
  right: 0;
  top: -20px;
  z-index: 0;
  font-family: var(--yz-font-heading);
  font-weight: 900;
  font-size: 120px;
  line-height: 0.9;
  color: var(--about-blue);
  -webkit-text-stroke: 1.5px rgba(201, 169, 110, 0.38);
  text-stroke: 1.5px rgba(201, 169, 110, 0.38);
  pointer-events: none;
  user-select: none;
}

.page-about__origin-copy {
  position: relative;
  z-index: 1;
}

.page-about__origin-copy h2 {
  margin: 0 0 18px;
  font-size: 26px;
  font-weight: 900;
  color: #FFFFFF;
  letter-spacing: 0.02em;
}

.page-about__origin-copy p {
  margin: 14px 0 0;
  color: var(--about-muted);
  font-size: 16px;
  line-height: 1.9;
  max-width: 620px;
}

.page-about__origin-points {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
  margin-top: 22px;
}

.page-about__origin-point {
  padding: 7px 14px;
  border: 1px solid var(--about-line);
  border-radius: 999px;
  color: var(--about-gold);
  font-family: var(--yz-font-heading);
  font-size: 14px;
  font-weight: 700;
  background: rgba(201, 169, 110, 0.06);
}

.page-about__origin-figure {
  margin: 0;
  position: relative;
  z-index: 1;
}

/* ===== 图片通用 ===== */
.page-about__img {
  display: block;
  width: 100%;
  height: auto;
  object-fit: cover;
}

/* ===== 02 发展里程碑 ===== */
.page-about__milestones {
  padding: 64px 0 56px;
  background:
    radial-gradient(ellipse at 20% 100%, rgba(20, 58, 107, 0.72) 0%, transparent 60%),
    linear-gradient(180deg, var(--about-bg-deep) 0%, var(--about-bg-navy) 100%);
  border-top: 3px solid rgba(201, 169, 110, 0.3);
  border-bottom: 3px solid rgba(201, 169, 110, 0.3);
}

.page-about__timeline-layout {
  position: relative;
}

.page-about__side-sticker {
  display: none;
}

.page-about__timeline {
  list-style: none;
  margin: 0;
  padding: 8px 0 0;
  position: relative;
}

.page-about__timeline::before {
  content: '';
  position: absolute;
  left: 36px;
  top: 16px;
  bottom: 24px;
  width: 3px;
  background: linear-gradient(to bottom, rgba(201, 169, 110, 0.65) 0%, rgba(201, 169, 110, 0.12) 100%);
}

.page-about__tl-item {
  position: relative;
  padding-bottom: 56px;
}

.page-about__tl-item:last-child {
  padding-bottom: 0;
}

.page-about__tl-dot {
  position: relative;
  z-index: 2;
  display: flex;
  align-items: center;
  justify-content: center;
  width: 74px;
  height: 74px;
  border-radius: 50%;
  border: 3px solid var(--about-gold);
  background: var(--about-bg-navy);
  color: var(--about-gold);
  font-family: var(--yz-font-heading);
  font-weight: 900;
  font-size: 16px;
  letter-spacing: 0.04em;
  box-shadow: 5px 5px 0 var(--about-gold-soft);
  margin-bottom: 20px;
}

.page-about__tl-card {
  background: var(--about-light);
  border: 3px solid #1A1A1A;
  border-left: 6px solid var(--about-gold);
  box-shadow: var(--about-card-shadow);
  padding: 22px 24px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about__tl-card:hover {
  transform: translateY(-3px);
  box-shadow: 10px 10px 0 rgba(201, 169, 110, 0.34);
}

.page-about__tl-card h3 {
  margin: 0 0 8px;
  font-family: var(--yz-font-heading);
  font-weight: 900;
  font-size: 19px;
  color: #0A1E3F;
}

.page-about__tl-card p {
  margin: 0;
  color: var(--yz-color-text-light);
  font-size: 15px;
  line-height: 1.8;
}

.page-about__milestone-meta {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 28px;
  margin-top: 44px;
  padding-top: 24px;
  border-top: 1px solid rgba(255, 255, 255, 0.14);
}

.page-about__milestone-meta span {
  font-family: var(--yz-font-heading);
  font-size: 14px;
  font-weight: 700;
  color: var(--about-gold);
  letter-spacing: 0.03em;
}

/* ===== 03 资质与认证 ===== */
.page-about__cert {
  padding: 64px 0;
  background: var(--about-light);
  color: var(--yz-color-text);
}

.page-about__cert .page-about__section-head--light .page-about__section-index {
  -webkit-text-stroke-color: var(--about-bg-navy);
  text-stroke-color: var(--about-bg-navy);
}

.page-about__cert .page-about__section-head-text h2 {
  color: var(--about-bg-navy);
}

.page-about__cert .page-about__section-head-text p {
  color: var(--yz-color-text-light);
}

.page-about__cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
  align-items: start;
}

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

.page-about__cert-item {
  display: flex;
  gap: 16px;
  align-items: flex-start;
  background: #FFFFFF;
  border: 3px solid var(--about-bg-navy);
  box-shadow: 4px 4px 0 rgba(10, 30, 63, 0.14);
  padding: 22px 20px;
  transition: transform 0.25s ease, box-shadow 0.25s ease;
}

.page-about__cert-item:hover {
  transform: translateY(-2px);
  box-shadow: 6px 6px 0 rgba(201, 169, 110, 0.55);
}

.page-about__cert-icon {
  flex: 0 0 36px;
  color: var(--about-bg-navy);
  transition: color 0.25s ease, transform 0.25s ease;
}

.page-about__cert-item:hover .page-about__cert-icon {
  color: var(--about-orange);
  transform: rotate(-4deg);
}

.page-about__cert-item h3 {
  margin: 0 0 6px;
  font-family: var(--yz-font-heading);
  font-weight: 900;
  font-size: 17px;
  color: var(--about-bg-navy);
}

.page-about__cert-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.75;
  color: var(--yz-color-text-light);
}

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

.page-about__cert-figure::after {
  content: '';
  position: absolute;
  left: 10px;
  top: 10px;
  right: -10px;
  bottom: -10px;
  border: 3px solid var(--about-gold);
  z-index: 0;
  pointer-events: none;
}

.page-about__cert-figure .page-about__img {
  position: relative;
  z-index: 1;
  border: 3px solid var(--about-bg-navy);
  box-shadow: 6px 6px 0 rgba(10, 30, 63, 0.16);
}

.page-about__figcap {
  position: relative;
  z-index: 1;
  margin-top: 18px;
  font-size: 13px;
  color: var(--yz-color-text-light);
  text-align: right;
}

/* ===== 04 团队与服务理念 ===== */
.page-about__team {
  padding: 64px 0;
  background:
    radial-gradient(ellipse at 100% 0%, rgba(201, 169, 110, 0.1) 0%, transparent 44%),
    var(--about-bg-navy);
}

.page-about__team-figure {
  margin: 0 0 36px;
  border: 3px solid rgba(255, 255, 255, 0.16);
  box-shadow: 8px 8px 0 rgba(0, 0, 0, 0.22);
}

.page-about__team-figure .page-about__img {
  max-height: 500px;
}

.page-about__team-list {
  display: grid;
  grid-template-columns: 1fr;
  gap: 18px;
}

.page-about__team-item {
  position: relative;
  padding: 24px 24px 24px 30px;
  border: 2px solid rgba(255, 255, 255, 0.2);
  background: rgba(20, 58, 107, 0.42);
  transition: border-color 0.25s ease, background 0.25s ease, transform 0.25s ease;
}

.page-about__team-item:hover {
  border-color: var(--about-gold);
  background: rgba(20, 58, 107, 0.65);
  transform: translateY(-2px);
}

.page-about__team-index {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 34px;
  height: 34px;
  border: 2px solid var(--about-gold);
  border-radius: 50%;
  font-family: var(--yz-font-heading);
  font-weight: 900;
  font-size: 15px;
  color: var(--about-gold);
  margin-bottom: 14px;
}

.page-about__team-item h3 {
  margin: 0 0 8px;
  font-size: 18px;
  font-weight: 900;
  color: #FFFFFF;
}

.page-about__team-item p {
  margin: 0;
  font-size: 15px;
  line-height: 1.8;
  color: var(--about-muted);
}

/* ===== CTA ===== */
.page-about__cta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 24px;
  margin-top: 48px;
  padding: 30px 28px;
  border: 3px solid var(--about-gold);
  background: linear-gradient(135deg, rgba(201, 169, 110, 0.18) 0%, rgba(201, 169, 110, 0.04) 100%);
  box-shadow: 7px 7px 0 rgba(201, 169, 110, 0.2);
}

.page-about__cta-copy h3 {
  margin: 0 0 8px;
  font-size: 20px;
  font-weight: 900;
  color: #FFFFFF;
}

.page-about__cta-copy p {
  margin: 0;
  color: var(--about-muted);
  font-size: 15px;
  line-height: 1.75;
}

.page-about__cta-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 10px;
}

.page-about__cta-actions .yz-btn {
  font-size: 14px;
}

/* ===== 响应式增强 ===== */
@media (min-width: 768px) {
  .page-about__hero-lead h1 {
    font-size: 46px;
  }

  .page-about__hero-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 0;
    border: 2px solid rgba(255, 255, 255, 0.2);
  }

  .page-about__stat {
    border: none;
    border-right: 2px solid rgba(255, 255, 255, 0.14);
    padding: 24px 8px;
  }

  .page-about__stat:last-child {
    border-right: none;
  }

  .page-about__origin-content {
    grid-template-columns: 1fr 1fr;
    gap: 36px;
    align-items: center;
  }

  .page-about__origin-figure .page-about__img {
    border: 3px solid rgba(255, 255, 255, 0.18);
    box-shadow: 10px 10px 0 rgba(201, 169, 110, 0.22);
  }

  .page-about__glyph {
    font-size: 160px;
    right: 24px;
    top: -32px;
  }

  .page-about__tl-dot {
    width: 84px;
    height: 84px;
    font-size: 18px;
  }

  .page-about__tl-item {
    padding-left: 120px;
    padding-bottom: 64px;
  }

  .page-about__tl-dot {
    position: absolute;
    left: 0;
    top: 0;
    margin-bottom: 0;
  }

  .page-about__timeline::before {
    left: 41px;
  }

  .page-about__tl-card {
    padding: 28px 30px;
  }

  .page-about__cert-grid {
    grid-template-columns: 1fr 1fr;
    gap: 48px;
  }

  .page-about__cert-item {
    padding: 26px 24px;
  }

  .page-about__team-list {
    grid-template-columns: repeat(3, 1fr);
    gap: 20px;
  }
}

@media (min-width: 1024px) {
  .page-about__hero {
    flex-wrap: nowrap;
  }

  .page-about__chapter-preview {
    flex: 0 1 240px;
    margin-top: 48px;
  }

  .page-about__timeline-layout {
    display: grid;
    grid-template-columns: 160px 1fr;
    gap: 56px;
    align-items: start;
  }

  .page-about__side-sticker {
    display: flex;
    position: sticky;
    top: 32px;
    align-self: start;
    padding-left: 8px;
    color: var(--about-gold);
    font-family: var(--yz-font-heading);
    font-weight: 700;
    letter-spacing: 0.12em;
  }

  .page-about__section-index {
    font-size: 112px;
  }

  .page-about__section-head {
    gap: 32px;
    margin-bottom: 64px;
  }

  .page-about__origin {
    padding: 56px 0 96px;
  }

  .page-about__milestones,
  .page-about__cert,
  .page-about__team {
    padding: 88px 0;
  }
}

@media (min-width: 1280px) {
  .page-about__hero-stats {
    margin-bottom: 72px;
  }

  .page-about__tl-item {
    padding-left: 148px;
  }

  .page-about__timeline::before {
    left: 41px;
  }

  .page-about__tl-card p {
    font-size: 16px;
  }

  .page-about__section-head-text p {
    font-size: 17px;
  }
}