.page-about {
  --about-hero-bg: #0D3B0F;
  --about-accent-gold: #FFD700;
  --about-accent-green: #1B5E20;
  --about-paper: #F5F2EB;
  --about-ink: #1A1A1A;
  --about-gray: #333333;
  --about-muted: #6B6B6B;
  --about-border: #D8D5CC;
  --about-card-bg: #FFFFFF;
  --about-dark-block: #F0EDE4;
  --about-timeline-line: #C8C4B8;
  --about-font-serif: "Noto Serif SC", "Source Han Serif SC", "Songti SC", SimSun, Georgia, serif;
  --about-font-sans: "Noto Sans SC", "Source Han Sans SC", "PingFang SC", "Microsoft YaHei", Roboto, Arial, sans-serif;
  --about-font-mono: "Roboto Mono", "SF Mono", "Cascadia Mono", Menlo, Consolas, monospace;
  --about-gutter: clamp(16px, 4vw, 48px);
  --about-shadow-sm: 0 1px 3px rgba(13, 59, 15, 0.08);
  --about-shadow-md: 0 6px 18px rgba(13, 59, 15, 0.10);

  background: var(--about-paper);
  color: var(--about-ink);
  font-family: var(--about-font-sans);
  line-height: 1.7;
  overflow-x: hidden;
}

.page-about *,
.page-about *::before,
.page-about *::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

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

.page-about a {
  color: var(--about-accent-green);
  text-decoration: underline;
  text-underline-offset: 3px;
  transition: color 160ms ease;
}

.page-about a:hover {
  color: var(--about-accent-gold);
}

/* 首屏横幅 */
.page-about-hero {
  position: relative;
  background: var(--about-hero-bg);
  color: #FFFFFF;
  padding: 48px var(--about-gutter) 0;
  overflow: hidden;
}

.page-about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-image:
    linear-gradient(rgba(255, 215, 0, 0.06) 1px, transparent 1px),
    linear-gradient(90deg, rgba(255, 215, 0, 0.06) 1px, transparent 1px);
  background-size: 32px 32px;
  pointer-events: none;
}

.page-about-hero-tag {
  font-family: var(--about-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--about-accent-gold);
  margin-bottom: 12px;
  position: relative;
  z-index: 1;
}

.page-about-hero-title {
  font-family: var(--about-font-serif);
  font-size: clamp(2rem, 5vw, 3.2rem);
  font-weight: 700;
  line-height: 1.15;
  max-width: 680px;
  position: relative;
  z-index: 1;
  margin-bottom: 16px;
}

.page-about-hero-subtitle {
  font-size: clamp(0.95rem, 1.4vw, 1.1rem);
  color: rgba(255, 255, 255, 0.85);
  max-width: 560px;
  position: relative;
  z-index: 1;
  margin-bottom: 28px;
}

.page-about-hero-facts {
  display: flex;
  flex-wrap: wrap;
  gap: 12px 24px;
  position: relative;
  z-index: 1;
  margin-bottom: 36px;
}

.page-about-hero-fact {
  font-size: 0.8rem;
  font-family: var(--about-font-mono);
  color: rgba(255, 255, 255, 0.75);
  border: 1px solid rgba(255, 255, 255, 0.22);
  padding: 6px 14px;
  border-radius: 2px;
  background: rgba(0, 0, 0, 0.18);
}

.page-about-hero-img {
  width: 100%;
  height: 180px;
  object-fit: cover;
  object-position: center;
  border-radius: 2px 2px 0 0;
  position: relative;
  z-index: 1;
  border: 1px solid rgba(255, 255, 255, 0.12);
}

/* 主体双栏布局 */
.page-about-body {
  display: grid;
  grid-template-columns: 1fr;
  max-width: 1200px;
  margin: 0 auto;
  padding: 0 var(--about-gutter);
  gap: 32px;
}

/* 侧边目录 */
.page-about-sidebar {
  padding-top: 16px;
}

.page-about-anchor {
  position: sticky;
  top: 16px;
  display: flex;
  flex-wrap: wrap;
  gap: 8px 16px;
  padding: 16px;
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-radius: 2px;
  box-shadow: var(--about-shadow-sm);
}

.page-about-anchor-label {
  flex-basis: 100%;
  font-family: var(--about-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.16em;
  text-transform: uppercase;
  color: var(--about-muted);
  margin-bottom: 4px;
}

.page-about-anchor-link {
  font-size: 0.82rem;
  font-family: var(--about-font-mono);
  text-decoration: none;
  color: var(--about-gray);
  padding: 4px 8px;
  border-left: 2px solid var(--about-border);
  transition: border-color 160ms ease, color 160ms ease, background 160ms ease;
}

.page-about-anchor-link:hover {
  border-left-color: var(--about-accent-gold);
  color: var(--about-accent-green);
  background: rgba(255, 215, 0, 0.08);
}

/* 内容主区 */
.page-about-main {
  min-width: 0;
  padding-bottom: 80px;
}

/* 区块通用 */
.page-about-section {
  padding: 64px 0 8px;
  scroll-margin-top: 24px;
}

.page-about-section-head {
  display: flex;
  align-items: flex-start;
  gap: 16px;
  margin-bottom: 36px;
  position: relative;
}

.page-about-section-num {
  font-family: var(--about-font-mono);
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--about-accent-gold);
  background: var(--about-accent-green);
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 2px;
  flex-shrink: 0;
}

.page-about-section-title {
  font-family: var(--about-font-serif);
  font-size: clamp(1.4rem, 2.5vw, 1.9rem);
  font-weight: 700;
  line-height: 1.25;
  color: var(--about-ink);
}

.page-about-section-desc {
  font-size: 0.9rem;
  color: var(--about-muted);
  margin-top: 6px;
}

.page-about-grid-lines {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  pointer-events: none;
  background-image: linear-gradient(rgba(27, 94, 32, 0.04) 1px, transparent 1px);
  background-size: 100% 24px;
}

/* 平台数据区 */
.page-about-stats-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: stretch;
}

.page-about-stats-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about-stat-card {
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-left: 4px solid var(--about-accent-green);
  border-radius: 2px;
  padding: 24px;
  box-shadow: var(--about-shadow-sm);
  position: relative;
  display: flex;
  flex-direction: column;
  gap: 4px;
  transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1), box-shadow 280ms ease;
}

.page-about-stat-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow-md);
}

.page-about-stat-name {
  font-size: 0.8rem;
  color: var(--about-muted);
  font-family: var(--about-font-sans);
  margin-bottom: 2px;
}

.page-about-stat-value {
  font-family: var(--about-font-mono);
  font-size: clamp(1.8rem, 3vw, 2.4rem);
  font-weight: 600;
  color: var(--about-accent-green);
  line-height: 1.2;
}

.page-about-stat-unit {
  font-size: 0.9rem;
  color: var(--about-accent-gold);
  margin-left: 4px;
}

.page-about-stat-note {
  font-size: 0.8rem;
  color: var(--about-gray);
  margin-top: 6px;
  padding-top: 8px;
  border-top: 1px solid #EEEAE1;
}

.page-about-stats-image {
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid var(--about-border);
  box-shadow: var(--about-shadow-sm);
}

.page-about-stats-image img {
  width: 100%;
  height: 240px;
  object-fit: cover;
  object-position: center;
  transition: transform 520ms cubic-bezier(0.16, 1, 0.3, 1);
}

.page-about-stats-image:hover img {
  transform: scale(1.03);
}

/* 时间轴 */
.page-about-timeline {
  position: relative;
  padding-left: 0;
}

.page-about-timeline::before {
  content: "";
  position: absolute;
  left: 14px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(to bottom, var(--about-accent-gold), var(--about-timeline-line), var(--about-accent-green));
}

.page-about-timeline-item {
  position: relative;
  padding: 0 0 40px 48px;
}

.page-about-timeline-item:last-child {
  padding-bottom: 8px;
}

.page-about-timeline-dot {
  position: absolute;
  left: 8px;
  top: 6px;
  width: 14px;
  height: 14px;
  border-radius: 50%;
  background: var(--about-accent-green);
  border: 3px solid var(--about-paper);
  box-shadow: 0 0 0 2px var(--about-accent-gold);
  z-index: 1;
}

.page-about-timeline-content {
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-radius: 2px;
  padding: 24px;
  box-shadow: var(--about-shadow-sm);
  transition: box-shadow 280ms ease, transform 280ms cubic-bezier(0.16, 1, 0.3, 1);
}

.page-about-timeline-content:hover {
  box-shadow: 0 8px 24px rgba(13, 59, 15, 0.12);
  transform: translateX(4px);
}

.page-about-version {
  display: inline-block;
  font-family: var(--about-font-mono);
  font-size: 0.7rem;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--about-accent-green);
  background: #E8F0E8;
  border: 1px solid #C8D8C8;
  padding: 3px 10px;
  border-radius: 999px;
  margin-bottom: 12px;
}

.page-about-timeline-title {
  font-family: var(--about-font-serif);
  font-size: 1.1rem;
  font-weight: 700;
  margin-bottom: 8px;
  color: var(--about-ink);
}

.page-about-timeline-desc {
  font-size: 0.88rem;
  color: var(--about-gray);
  line-height: 1.8;
}

/* 资质认证 */
.page-about-cert-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 28px;
}

.page-about-cert-list {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.page-about-cert-item {
  display: flex;
  align-items: flex-start;
  gap: 18px;
  padding: 20px;
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-radius: 2px;
  transition: border-color 280ms ease, box-shadow 280ms ease;
}

.page-about-cert-item:hover {
  border-color: var(--about-accent-gold);
  box-shadow: var(--about-shadow-sm);
}

.page-about-cert-icon {
  position: relative;
  width: 44px;
  height: 44px;
  flex-shrink: 0;
  background: var(--about-accent-green);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
}

.page-about-cert-icon::before {
  content: "◎";
  color: var(--about-accent-gold);
  font-size: 1.3rem;
  font-family: var(--about-font-mono);
}

.page-about-cert-title {
  font-family: var(--about-font-serif);
  font-size: 1.02rem;
  font-weight: 700;
  color: var(--about-ink);
  margin-bottom: 6px;
}

.page-about-cert-desc {
  font-size: 0.85rem;
  color: var(--about-gray);
  line-height: 1.75;
}

.page-about-cert-image {
  border-radius: 2px;
  overflow: hidden;
  border: 1px solid var(--about-border);
  box-shadow: var(--about-shadow-sm);
}

.page-about-cert-image img {
  width: 100%;
  height: 200px;
  object-fit: cover;
  object-position: center;
}

/* 团队文化 */
.page-about-culture-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about-culture-card {
  position: relative;
  border-radius: 2px;
  padding: 28px 24px;
  min-height: 160px;
  border: 1px solid var(--about-border);
  transition: transform 280ms cubic-bezier(0.16, 1, 0.3, 1), box-shadow 280ms ease;
}

.page-about-culture-card:hover {
  transform: translateY(-4px);
  box-shadow: var(--about-shadow-md);
}

.page-about-culture-card-green {
  background: var(--about-accent-green);
  color: #FFFFFF;
  border-color: transparent;
}

.page-about-culture-card-green .page-about-culture-title {
  color: var(--about-accent-gold);
}

.page-about-culture-card-green .page-about-culture-text {
  color: rgba(255, 255, 255, 0.88);
}

.page-about-culture-card-gold {
  background: var(--about-accent-gold);
  color: var(--about-ink);
  border-color: #E6BF00;
}

.page-about-culture-card-gold .page-about-culture-title {
  color: var(--about-accent-green);
}

.page-about-culture-card-gold .page-about-culture-text {
  color: rgba(26, 26, 26, 0.85);
}

.page-about-culture-card-lines {
  background:
    linear-gradient(rgba(27, 94, 32, 0.05) 1px, transparent 1px),
    linear-gradient(90deg, rgba(27, 94, 32, 0.05) 1px, transparent 1px),
    var(--about-card-bg);
  background-size: 24px 24px;
}

.page-about-culture-title {
  font-family: var(--about-font-serif);
  font-size: 1.15rem;
  font-weight: 700;
  margin-bottom: 10px;
}

.page-about-culture-text {
  font-size: 0.9rem;
  line-height: 1.85;
}

/* 品牌承诺 */
.page-about-promise-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
  margin-bottom: 36px;
}

.page-about-promise-item {
  position: relative;
  padding: 24px;
  background: var(--about-card-bg);
  border: 1px solid var(--about-border);
  border-radius: 2px;
  overflow: hidden;
  transition: border-color 280ms ease, box-shadow 280ms ease;
}

.page-about-promise-item:hover {
  border-color: var(--about-accent-green);
  box-shadow: var(--about-shadow-sm);
}

.page-about-promise-index {
  position: absolute;
  top: 8px;
  right: 16px;
  font-family: var(--about-font-mono);
  font-size: 3rem;
  font-weight: 600;
  color: rgba(27, 94, 32, 0.08);
  line-height: 1;
  transition: color 280ms ease;
}

.page-about-promise-item:hover .page-about-promise-index {
  color: rgba(255, 215, 0, 0.28);
}

.page-about-promise-title {
  font-family: var(--about-font-serif);
  font-size: 1.02rem;
  font-weight: 700;
  margin-bottom: 8px;
  padding-right: 40px;
  position: relative;
  z-index: 1;
}

.page-about-promise-desc {
  font-size: 0.86rem;
  color: var(--about-gray);
  line-height: 1.75;
  position: relative;
  z-index: 1;
}

.page-about-promise-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  align-items: center;
  padding-top: 8px;
  border-top: 1px solid var(--about-border);
}

/* 按钮微调 */
.page-about .btn {
  font-family: var(--about-font-sans);
  font-size: 0.88rem;
  font-weight: 500;
  padding: 10px 20px;
  border-radius: 2px;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  text-decoration: none;
  transition: background 160ms ease, color 160ms ease, border-color 160ms ease, transform 160ms ease;
  cursor: pointer;
  border: 1px solid transparent;
}

.page-about .btn:hover {
  transform: translateY(-2px);
}

.page-about .btn:active {
  transform: translateY(0);
}

.page-about .btn-primary {
  background: var(--about-accent-green);
  color: #FFFFFF;
  border-color: var(--about-accent-green);
}

.page-about .btn-primary:hover {
  background: #0D3B0F;
  border-color: #0D3B0F;
  color: #FFFFFF;
}

.page-about .btn-outline {
  background: transparent;
  border-color: var(--about-accent-green);
  color: var(--about-accent-green);
}

.page-about .btn-outline:hover {
  background: var(--about-accent-green);
  color: #FFFFFF;
}

/* 滚动显现协议 */
.page-about [data-reveal] {
  opacity: 0;
  transform: translateY(24px);
  transition: opacity 520ms cubic-bezier(0.16, 1, 0.3, 1), transform 520ms cubic-bezier(0.16, 1, 0.3, 1);
  transition-delay: calc(var(--reveal-delay, 0) * 60ms);
}

.page-about [data-reveal].is-visible {
  opacity: 1;
  transform: translateY(0);
}

.page-about [data-reveal="0"] { --reveal-delay: 0; }
.page-about [data-reveal="1"] { --reveal-delay: 1; }
.page-about [data-reveal="2"] { --reveal-delay: 2; }
.page-about [data-reveal="3"] { --reveal-delay: 3; }
.page-about [data-reveal="4"] { --reveal-delay: 4; }
.page-about [data-reveal="5"] { --reveal-delay: 5; }

/* 移动端优先 + 横屏平板断点 */
@media (min-width: 640px) {
  .page-about-hero {
    padding-top: 64px;
  }

  .page-about-hero-img {
    height: 300px;
  }

  .page-about-stats-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about-culture-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about-culture-card:last-child {
    grid-column: span 2;
  }

  .page-about-promise-grid {
    grid-template-columns: 1fr 1fr;
  }

  .page-about-anchor {
    gap: 12px 8px;
  }
}

/* 桌面断点 */
@media (min-width: 992px) {
  .page-about-hero {
    padding: 80px var(--about-gutter) 0;
  }

  .page-about-hero-img {
    height: 420px;
  }

  .page-about-body {
    grid-template-columns: 220px 1fr;
    gap: 48px;
    padding-top: 24px;
  }

  .page-about-sidebar {
    padding-top: 24px;
    position: relative;
  }

  .page-about-anchor {
    display: block;
    padding: 20px 16px;
  }

  .page-about-anchor-label {
    display: block;
    margin-bottom: 14px;
  }

  .page-about-anchor-link {
    display: block;
    padding: 10px 12px;
    margin-bottom: 4px;
    font-size: 0.8rem;
  }

  .page-about-stats-layout {
    grid-template-columns: 1.2fr 1fr;
    gap: 28px;
  }

  .page-about-stats-image img {
    height: 100%;
    min-height: 420px;
  }

  .page-about-cert-wrap {
    grid-template-columns: 1.1fr 1fr;
    gap: 28px;
    align-items: stretch;
  }

  .page-about-cert-image img {
    height: 100%;
    min-height: 400px;
    object-fit: cover;
  }

  .page-about-culture-grid {
    grid-template-columns: repeat(3, 1fr);
  }

  .page-about-culture-card:last-child {
    grid-column: auto;
  }

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

/* 桌面宽屏 */
@media (min-width: 1280px) {
  .page-about-body {
    grid-template-columns: 260px 1fr;
  }

  .page-about-hero-img {
    height: 500px;
  }
}

/* 尊重 reduced-motion 动效偏好 */
@media (prefers-reduced-motion: reduce) {
  .page-about [data-reveal] {
    opacity: 1;
    transform: none;
    transition: none;
  }

  .page-about *,
  .page-about *::before,
  .page-about *::after {
    transition-duration: 0.01ms !important;
    animation-duration: 0.01ms !important;
  }

  .page-about .page-about-stat-card,
  .page-about .page-about-timeline-content,
  .page-about .page-about-culture-card,
  .page-about .page-about-promise-item {
    transition: none;
  }
}