.page-about {
  font-family: var(--font-body);
  color: var(--ink);
  background: var(--paper);
  overflow-x: hidden;
}

/* ========== 首屏 · 品牌叙事与统计 ========== */
.page-about .brand-hero {
  position: relative;
  background: linear-gradient(132deg, var(--deep-red) 0%, var(--primary) 56%, #d62832 100%);
  color: #fff;
  overflow: hidden;
  padding: 56px 0 88px;
}
.page-about .brand-hero::before {
  content: "";
  position: absolute;
  right: -90px;
  top: 10px;
  width: 420px;
  height: 420px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.14);
}
.page-about .brand-hero::after {
  content: "";
  position: absolute;
  left: -70px;
  bottom: -40px;
  width: 260px;
  height: 120px;
  background: rgba(212,160,23,.16);
  filter: blur(28px);
  transform: rotate(-10deg);
}
.page-about .hero-grid {
  position: relative;
  z-index: 1;
  display: grid;
  gap: 40px;
  align-items: center;
}
.page-about .hero-eyebrow {
  display: inline-flex;
  align-items: center;
  gap: 10px;
  font-size: 13px;
  letter-spacing: .12em;
  color: var(--light-gold);
  margin-bottom: 16px;
}
.page-about .hero-eyebrow::before {
  content: "";
  width: 26px;
  height: 2px;
  background: var(--gold);
}
.page-about .hero-copy h1 {
  font-family: var(--font-title);
  font-size: clamp(34px, 6.5vw, 58px);
  line-height: 1.14;
  margin: 0 0 20px;
  letter-spacing: .02em;
}
.page-about .hero-lead {
  font-size: 16px;
  color: rgba(255,255,255,.9);
  max-width: 560px;
  line-height: 1.8;
  margin: 0;
}
.page-about .hero-actions {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  margin-top: 30px;
}
.page-about .hero-visual {
  display: flex;
  justify-content: center;
  align-items: center;
  position: relative;
  animation: page-about-float 6s ease-in-out infinite alternate;
}
.page-about .hero-ring {
  width: min(300px, 74vw);
  height: auto;
}
.page-about .hero-ring text {
  font-family: var(--font-title);
}
.page-about .ring-track {
  transform-origin: center;
  animation: page-about-spin 30s linear infinite;
}
.page-about .hero-stats {
  position: relative;
  z-index: 1;
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
  margin-top: 48px;
}
.page-about .hero-stat {
  position: relative;
  background: rgba(0,0,0,.22);
  border: 1px solid rgba(255,255,255,.14);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  overflow: hidden;
}
.page-about .hero-stat::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0;
  width: 100%;
  height: 3px;
  background: linear-gradient(90deg, var(--gold), var(--light-gold));
}
.page-about .hero-stat::after {
  content: "";
  position: absolute;
  right: -18px;
  top: -18px;
  width: 56px;
  height: 56px;
  background: rgba(255,255,255,.05);
  transform: rotate(45deg);
  border-radius: 8px;
}
.page-about .hero-stat-num {
  display: block;
  font-family: var(--font-title);
  font-size: 30px;
  line-height: 1.1;
  color: #fff;
}
.page-about .hero-stat-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: rgba(255,255,255,.72);
}

/* ========== 章节目录导航 ========== */
.page-about .page-toc {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 8px 10px;
  margin-top: 44px;
  padding: 14px 16px;
  background: var(--warm-gray);
  border-radius: var(--radius-lg);
}
.page-about .toc-label {
  font-size: 13px;
  font-weight: 700;
  color: var(--deep-red);
  letter-spacing: .06em;
  margin-right: 6px;
}
.page-about .page-toc a {
  text-decoration: none;
  font-size: 14px;
  font-weight: 500;
  color: var(--gray);
  padding: 6px 14px;
  border-radius: var(--radius-pill);
  transition: background .2s, color .2s, box-shadow .2s;
}
.page-about .page-toc a:hover,
.page-about .page-toc a:focus {
  background: #fff;
  color: var(--primary);
  box-shadow: 0 4px 14px rgba(0,0,0,.08);
}

/* ========== 通用章节间距 ========== */
.page-about .section {
  padding: 64px 0;
  scroll-margin-top: 24px;
}

/* ========== 品牌故事 ========== */
.page-about .brand-story {
  padding-top: 72px;
  padding-bottom: 16px;
}
.page-about .story-grid {
  display: grid;
  gap: 40px;
  align-items: center;
}
.page-about .story-media {
  position: relative;
}
.page-about .story-media::before {
  content: "";
  position: absolute;
  top: 14px;
  left: 14px;
  width: 100%;
  height: 100%;
  border: 2px solid var(--gold);
  border-radius: var(--radius-lg);
  z-index: 0;
}
.page-about .story-media img {
  position: relative;
  z-index: 1;
  width: 100%;
  height: auto;
  border-radius: var(--radius-lg);
  object-fit: cover;
  box-shadow: 0 16px 40px rgba(0,0,0,.1);
}
.page-about .story-copy .prose p {
  margin: 0 0 18px;
  color: var(--gray);
  font-size: 15px;
}
.page-about .story-copy .prose p:last-child {
  margin-bottom: 0;
}

/* ========== 核心数据 ========== */
.page-about .core-data {
  position: relative;
  background: var(--ink);
  color: #fff;
  padding: 72px 0 96px;
  overflow: hidden;
}
.page-about .core-data::before {
  content: "";
  position: absolute;
  top: -30px;
  right: -70px;
  width: 340px;
  height: 340px;
  border-radius: 50%;
  border: 2px solid rgba(255,255,255,.07);
}
.page-about .core-data::after {
  content: "";
  position: absolute;
  left: 0;
  right: 0;
  bottom: -2px;
  height: 48px;
  background: var(--paper);
  clip-path: polygon(0 100%, 100% 0, 100% 100%);
  z-index: 1;
}
.page-about .core-data .section-title--light {
  color: #fff;
}
.page-about .data-head {
  display: flex;
  flex-direction: column;
  gap: 6px;
  margin-bottom: 12px;
}
.page-about .data-desc {
  color: rgba(255,255,255,.62);
  font-size: 14px;
  margin: 0;
}
.page-about .data-layout {
  display: grid;
  gap: 40px;
  margin-top: 36px;
}
.page-about .data-grid {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}
.page-about .data-card {
  background: rgba(255,255,255,.05);
  border: 1px solid rgba(255,255,255,.1);
  border-radius: var(--radius-md);
  padding: 18px 16px;
  transition: background .25s ease, transform .25s ease;
}
.page-about .data-card:hover {
  background: rgba(255,255,255,.09);
  transform: translateY(-3px);
}
.page-about .data-figure {
  display: block;
  font-family: var(--font-title);
  font-size: 30px;
  line-height: 1.2;
  color: var(--light-gold);
}
.page-about .data-label {
  display: block;
  margin-top: 8px;
  font-size: 13px;
  color: rgba(255,255,255,.7);
}
.page-about .data-visual {
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .data-visual img {
  width: 100%;
  max-width: 400px;
  height: auto;
  border-radius: var(--radius-lg);
  box-shadow: 0 20px 60px rgba(0,0,0,.4);
}

/* ========== 发展里程碑 · 时间轴 ========== */
.page-about .milestones {
  padding: 80px 0 64px;
}
.page-about .milestones-intro {
  margin: 0 0 44px;
  color: var(--gray);
  font-size: 15px;
  max-width: 640px;
}
.page-about .timeline {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}
.page-about .timeline::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 3px;
  border-radius: var(--radius-pill);
  background: linear-gradient(var(--primary) 0%, var(--gold) 100%);
}
.page-about .milestone-item {
  position: relative;
  padding: 0 0 20px 48px;
}
.page-about .milestone-item::before {
  content: "";
  position: absolute;
  left: 5px;
  top: 20px;
  width: 17px;
  height: 17px;
  border-radius: 50%;
  background: #fff;
  border: 4px solid var(--gold);
  box-shadow: 0 0 0 5px rgba(199,0,11,.12);
}
.page-about .milestone details {
  background: var(--warm-gray);
  border: 1px solid rgba(0,0,0,.04);
  border-radius: var(--radius-md);
  padding: 16px 18px;
  transition: box-shadow .25s ease, background .25s ease;
}
.page-about .milestone details[open] {
  background: #fff;
  box-shadow: 0 10px 30px rgba(0,0,0,.07);
}
.page-about .milestone summary {
  list-style: none;
  cursor: pointer;
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 10px;
  font-weight: 700;
}
.page-about .milestone summary::-webkit-details-marker {
  display: none;
}
.page-about .milestone summary::after {
  content: "+";
  margin-left: auto;
  font-size: 22px;
  font-weight: 700;
  line-height: 1;
  color: var(--primary);
  transition: transform .2s;
}
.page-about .milestone details[open] summary::after {
  transform: rotate(45deg);
}
.page-about .milestone-phase {
  flex: none;
  display: inline-flex;
  align-items: center;
  background: var(--primary);
  color: #fff;
  border-radius: var(--radius-pill);
  padding: 4px 12px;
  font-size: 12px;
  letter-spacing: .04em;
}
.page-about .milestone-title {
  font-family: var(--font-title);
  font-size: 18px;
}
.page-about .milestone p {
  margin: 14px 0 0;
  color: var(--gray);
  font-size: 14px;
  line-height: 1.8;
}

/* ========== 资质与服务标准 ========== */
.page-about .quality {
  background: var(--warm-gray);
  padding: 80px 0 88px;
  position: relative;
}
.page-about .quality::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 4px;
  background: linear-gradient(90deg, var(--primary), var(--gold) 55%, transparent);
}
.page-about .quality-grid {
  display: grid;
  gap: 44px;
  align-items: center;
}
.page-about .quality-lead {
  color: var(--gray);
  font-size: 15px;
  margin: 0;
}
.page-about .standard-list {
  list-style: none;
  padding: 0;
  margin: 24px 0 0;
  display: grid;
  gap: 14px;
}
.page-about .standard-list li {
  position: relative;
  padding: 16px 16px 16px 52px;
  background: #fff;
  border-radius: var(--radius-md);
  color: var(--gray);
  font-size: 14px;
  box-shadow: 0 4px 16px rgba(0,0,0,.05);
}
.page-about .standard-list li::before {
  content: "✓";
  position: absolute;
  left: 14px;
  top: 14px;
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--primary);
  color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 13px;
  font-weight: 700;
}
.page-about .quality-badge {
  position: relative;
  display: flex;
  justify-content: center;
  align-items: center;
}
.page-about .quality-badge::before {
  content: "";
  position: absolute;
  top: 50%;
  left: 50%;
  width: min(280px, 88vw);
  height: min(280px, 88vw);
  transform: translate(-50%, -50%);
  border: 2px dashed var(--gold);
  border-radius: 50%;
}
.page-about .quality-badge img {
  position: relative;
  z-index: 1;
  width: 240px;
  height: 240px;
  border-radius: 50%;
  object-fit: cover;
  border: 6px solid #fff;
  box-shadow: 0 16px 44px rgba(0,0,0,.14);
}

/* ========== 合作伙伴与生态 ========== */
.page-about .partners {
  padding: 80px 0 96px;
}
.page-about .partners-intro {
  margin: 0 0 40px;
  color: var(--gray);
  font-size: 15px;
  max-width: 640px;
}
.page-about .partner-grid {
  list-style: none;
  padding: 0;
  margin: 0;
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
}
.page-about .partner-card {
  background: var(--warm-gray);
  border: 1px solid rgba(0,0,0,.04);
  border-radius: var(--radius-md);
  padding: 24px 20px;
  transition: transform .25s ease, box-shadow .25s ease, background .25s ease, border-color .25s ease;
}
.page-about .partner-card:hover {
  background: #fff;
  transform: translateY(-4px);
  box-shadow: 0 14px 34px rgba(0,0,0,.08);
  border-color: rgba(212,160,23,.35);
}
.page-about .partner-icon {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 44px;
  height: 44px;
  border-radius: 14px;
  background: var(--ink);
  color: var(--gold);
  font-size: 19px;
  font-weight: 700;
  margin-bottom: 14px;
}
.page-about .partner-card h3 {
  margin: 0 0 8px;
  font-family: var(--font-title);
  font-size: 17px;
  color: var(--ink);
}
.page-about .partner-card p {
  margin: 0;
  font-size: 13px;
  color: var(--gray);
  line-height: 1.7;
}

/* ========== 响应式布局 ========== */
@media (min-width: 640px) {
  .page-about .hero-stats {
    grid-template-columns: repeat(4, 1fr);
  }
  .page-about .data-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (min-width: 992px) {
  .page-about .brand-hero {
    padding-top: 80px;
  }
  .page-about .hero-grid {
    grid-template-columns: 1.05fr .95fr;
    gap: 32px;
  }
  .page-about .hero-ring {
    width: 340px;
  }
  .page-about .story-grid {
    grid-template-columns: .9fr 1.1fr;
    gap: 64px;
  }
  .page-about .data-layout {
    grid-template-columns: 1fr 400px;
    gap: 56px;
    align-items: center;
  }
  .page-about .quality-grid {
    grid-template-columns: 1.15fr .85fr;
    gap: 64px;
  }
  .page-about .partner-grid {
    grid-template-columns: repeat(3, 1fr);
  }
  .page-about .timeline {
    max-width: 1000px;
    margin: 0 auto;
  }
  .page-about .timeline::before {
    left: 50%;
    transform: translateX(-50%);
  }
  .page-about .milestone-item {
    width: 50%;
    padding: 0 48px 24px 0;
  }
  .page-about .milestone-item::before {
    left: auto;
    right: -9px;
  }
  .page-about .milestone-item:nth-child(even) {
    margin-left: 50%;
    padding: 0 0 24px 48px;
  }
  .page-about .milestone-item:nth-child(even)::before {
    right: auto;
    left: -9px;
  }
}

@media (prefers-reduced-motion: reduce) {
  .page-about .hero-visual,
  .page-about .ring-track {
    animation: none;
  }
}

@keyframes page-about-spin {
  to {
    transform: rotate(360deg);
  }
}

@keyframes page-about-float {
  from {
    transform: translateY(0);
  }
  to {
    transform: translateY(-12px);
  }
}