.page-about {
  --about-bg-deep: #0B3D2E;
  --about-bg-dark: #06241C;
  --about-gold: #C9A227;
  --about-amber: #E0A800;
  --about-crimson: #8B1E3F;
  --about-cream: #F5F0E6;
  --about-ink: #1A1A1A;
  --about-white: #FFFFFF;
  --about-sage: #7A8B7A;
  --about-font-heading: "Arial Black", "PingFang SC", "Microsoft YaHei", sans-serif;
  --about-font-body: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", sans-serif;
  --about-font-mono: "Courier New", "Roboto Mono", monospace;
  background: var(--about-cream);
  color: var(--about-ink);
  font-family: var(--about-font-body);
  line-height: 1.7;
}

.page-about .container {
  max-width: 1280px;
  margin: 0 auto;
  padding-left: 24px;
  padding-right: 24px;
}

.page-about a {
  color: var(--about-bg-deep);
  text-decoration: none;
  transition: color 0.2s ease;
}

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

.page-about h1,
.page-about h2,
.page-about h3 {
  font-family: var(--about-font-heading);
  line-height: 1.2;
  margin: 0;
}

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

.page-about .btn {
  display: inline-block;
  padding: 14px 32px;
  font-family: var(--about-font-body);
  font-size: 1rem;
  font-weight: 700;
  border: 2px solid transparent;
  cursor: pointer;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease, border-color 0.2s ease;
}

.page-about .btn-primary {
  background: var(--about-bg-deep);
  color: var(--about-white);
  border-color: var(--about-bg-deep);
  position: relative;
  overflow: hidden;
}

.page-about .btn-primary::after {
  content: "";
  position: absolute;
  top: 0;
  left: -120%;
  width: 50%;
  height: 100%;
  background: linear-gradient(100deg, transparent, rgba(201, 162, 39, 0.55), transparent);
  transition: left 0.4s ease;
}

.page-about .btn-primary:hover {
  background: var(--about-gold);
  border-color: var(--about-gold);
  color: var(--about-bg-dark);
  transform: translateY(-3px);
  box-shadow: 0 10px 24px rgba(6, 36, 28, 0.18);
}

.page-about .btn-primary:hover::after {
  left: 120%;
}

@media (prefers-reduced-motion: reduce) {
  .page-about .btn-primary::after {
    display: none;
  }
  .page-about .btn-primary:hover {
    transform: none;
  }
}

/* ============ 首屏 Hero ============ */
.page-about .about-hero {
  background: var(--about-bg-deep);
  background-image:
    linear-gradient(120deg, rgba(11, 61, 46, 0.92) 0%, rgba(6, 36, 28, 0.98) 100%),
    radial-gradient(ellipse at 80% 20%, rgba(201, 162, 39, 0.12) 0%, transparent 60%);
  color: var(--about-white);
  padding: 88px 0 64px;
  position: relative;
  overflow: hidden;
  border-bottom: 4px solid var(--about-gold);
}

.page-about .about-hero::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 42%;
  height: 100%;
  background: linear-gradient(135deg, transparent 46%, rgba(201, 162, 39, 0.22) 46%, rgba(201, 162, 39, 0.22) 54%, transparent 54%);
  background-size: 24px 24px;
  opacity: 0.35;
  pointer-events: none;
}

.page-about .about-hero::after {
  content: "";
  position: absolute;
  bottom: 0;
  left: 0;
  width: 100%;
  height: 6px;
  background: linear-gradient(90deg, var(--about-gold) 0%, var(--about-crimson) 70%, transparent 100%);
  opacity: 0.5;
}

.page-about .about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
  position: relative;
  z-index: 1;
}

.page-about .about-hero-kicker {
  font-family: var(--about-font-mono);
  font-size: 0.875rem;
  letter-spacing: 0.12em;
  color: var(--about-gold);
  margin: 0 0 20px;
  text-transform: uppercase;
}

.page-about .about-hero-title {
  font-size: 1.875rem;
  line-height: 1.25;
  margin: 0 0 24px;
  letter-spacing: 0.02em;
}

.page-about .about-hero-title-accent {
  color: var(--about-gold);
}

.page-about .about-hero-lead {
  font-size: 1.0625rem;
  line-height: 1.8;
  color: rgba(255, 255, 255, 0.88);
  max-width: 56ch;
  margin: 0 0 40px;
}

.page-about .about-hero-meta {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 20px;
}

.page-about .about-hero-stat {
  border-left: 3px solid var(--about-gold);
  padding-left: 14px;
}

.page-about .about-hero-stat-num {
  display: block;
  font-family: var(--about-font-mono);
  font-size: 1.875rem;
  font-weight: 700;
  color: var(--about-white);
  line-height: 1.2;
}

.page-about .about-hero-unit {
  font-size: 1rem;
  color: var(--about-gold);
  margin-left: 4px;
}

.page-about .about-hero-stat-label {
  display: block;
  font-size: 0.8125rem;
  color: var(--about-sage);
  margin-top: 4px;
  letter-spacing: 0.04em;
}

.page-about .about-hero-visual img {
  width: 100%;
  height: auto;
  max-height: 360px;
  object-fit: cover;
  border: 1px solid rgba(201, 162, 39, 0.35);
  box-shadow: 0 18px 48px rgba(0, 0, 0, 0.3);
}

/* ============ 主体布局 ============ */
.page-about .about-body {
  padding: 64px 0 80px;
}

.page-about .about-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 48px;
}

.page-about .about-sidebar {
  display: none;
}

.page-about .about-content {
  min-width: 0;
}

.page-about .about-section {
  margin-bottom: 80px;
  scroll-margin-top: 84px;
}

.page-about .about-section-heading {
  display: flex;
  align-items: baseline;
  gap: 16px;
  margin-bottom: 32px;
  border-bottom: 2px solid rgba(11, 61, 46, 0.12);
  padding-bottom: 12px;
}

.page-about .about-section-index {
  font-family: var(--about-font-mono);
  font-size: 1rem;
  font-weight: 700;
  color: var(--about-gold);
  background: var(--about-bg-deep);
  padding: 4px 10px;
  letter-spacing: 0.08em;
}

.page-about .about-section-title {
  font-size: 1.5rem;
  color: var(--about-ink);
  letter-spacing: 0.01em;
}

/* ============ 品牌初心 ============ */
.page-about .about-mission-block {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

.page-about .about-mission-principle {
  background: var(--about-white);
  border: 1px solid rgba(11, 61, 46, 0.12);
  padding: 32px 28px;
  position: relative;
  box-shadow: 0 2px 12px rgba(6, 36, 28, 0.06);
}

.page-about .about-mission-principle::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 4px;
  height: 100%;
  background: linear-gradient(180deg, var(--about-gold), var(--about-crimson));
}

.page-about .about-mission-text {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(26, 26, 26, 0.86);
  margin: 0 0 16px;
}

.page-about .about-mission-text:last-child {
  margin-bottom: 0;
}

.page-about .about-mission-values {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

.page-about .about-value-item {
  background: var(--about-white);
  border: 1px solid rgba(11, 61, 46, 0.1);
  border-top: 3px solid var(--about-gold);
  padding: 24px 22px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-value-item:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(6, 36, 28, 0.12);
}

.page-about .about-value-num {
  display: block;
  font-family: var(--about-font-mono);
  font-size: 0.875rem;
  color: var(--about-gold);
  margin-bottom: 10px;
}

.page-about .about-value-title {
  display: block;
  font-family: var(--about-font-heading);
  font-size: 1.125rem;
  color: var(--about-bg-deep);
  margin-bottom: 8px;
}

.page-about .about-value-desc {
  font-size: 0.875rem;
  line-height: 1.7;
  color: rgba(26, 26, 26, 0.74);
}

/* ============ 发展里程碑 ============ */
.page-about .about-timeline {
  position: relative;
  padding-left: 24px;
}

.page-about .about-timeline::before {
  content: "";
  position: absolute;
  top: 8px;
  left: 7px;
  bottom: 8px;
  width: 2px;
  background: linear-gradient(180deg, var(--about-gold) 0%, var(--about-bg-deep) 40%, rgba(11, 61, 46, 0.2) 100%);
}

.page-about .about-timeline-item {
  position: relative;
  margin-bottom: 32px;
}

.page-about .about-timeline-item:last-child {
  margin-bottom: 0;
}

.page-about .about-timeline-dot {
  position: absolute;
  top: 28px;
  left: -24px;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background: var(--about-bg-deep);
  border: 3px solid var(--about-gold);
  box-sizing: border-box;
  z-index: 1;
}

.page-about .about-timeline-card {
  background: var(--about-white);
  border: 1px solid rgba(11, 61, 46, 0.1);
  border-left: 3px solid var(--about-gold);
  padding: 24px 22px;
  transition: transform 0.2s ease, box-shadow 0.2s ease, border-color 0.2s ease;
}

.page-about .about-timeline-card:hover {
  transform: translateX(4px);
  box-shadow: 0 12px 28px rgba(6, 36, 28, 0.12);
  border-left-color: var(--about-crimson);
}

.page-about .about-timeline-year {
  display: inline-block;
  font-family: var(--about-font-mono);
  font-size: 1.375rem;
  font-weight: 700;
  color: var(--about-bg-deep);
  border-bottom: 2px solid var(--about-gold);
  padding-bottom: 2px;
  margin-bottom: 12px;
}

.page-about .about-timeline-title {
  font-size: 1.125rem;
  color: var(--about-ink);
  margin-bottom: 8px;
}

.page-about .about-timeline-desc {
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(26, 26, 26, 0.74);
  margin: 0;
}

/* ============ 技术架构 ============ */
.page-about .about-tech-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-tech-visual {
  background: var(--about-bg-deep);
  padding: 0;
  position: relative;
  border: 1px solid rgba(201, 162, 39, 0.3);
}

.page-about .about-tech-visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

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

.page-about .about-tech-item {
  display: flex;
  gap: 18px;
  background: var(--about-white);
  border: 1px solid rgba(11, 61, 46, 0.08);
  padding: 22px 20px;
  transition: background-color 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-tech-item:hover {
  background: var(--about-white);
  box-shadow: 0 8px 24px rgba(6, 36, 28, 0.1);
}

.page-about .about-tech-item-num {
  font-family: var(--about-font-mono);
  font-size: 0.875rem;
  font-weight: 700;
  color: var(--about-gold);
  background: var(--about-bg-deep);
  width: 32px;
  height: 32px;
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  margin-top: 2px;
}

.page-about .about-tech-item-title {
  font-size: 1.0625rem;
  color: var(--about-bg-deep);
  margin-bottom: 6px;
}

.page-about .about-tech-item-desc {
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(26, 26, 26, 0.74);
  margin: 0;
}

/* ============ 数据来源与合作 ============ */
.page-about .about-data-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .about-data-card {
  background: var(--about-white);
  border: 1px solid rgba(11, 61, 46, 0.1);
  padding: 30px 26px;
  position: relative;
  overflow: hidden;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .about-data-card:hover {
  transform: translateY(-4px);
  box-shadow: 0 14px 32px rgba(6, 36, 28, 0.14);
}

.page-about .about-data-card::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 80px;
  height: 80px;
  background: linear-gradient(135deg, transparent 50%, rgba(201, 162, 39, 0.12) 50%);
}

.page-about .about-data-card-tag {
  display: inline-block;
  font-family: var(--about-font-mono);
  font-size: 0.75rem;
  letter-spacing: 0.1em;
  color: var(--about-white);
  background: var(--about-bg-deep);
  padding: 3px 10px;
  margin-bottom: 16px;
}

.page-about .about-data-card-source .about-data-card-tag {
  background: var(--about-bg-deep);
}

.page-about .about-data-card-ops .about-data-card-tag {
  background: var(--about-crimson);
}

.page-about .about-data-card-credit .about-data-card-tag {
  background: var(--about-gold);
  color: var(--about-bg-dark);
}

.page-about .about-data-card-title {
  font-size: 1.1875rem;
  color: var(--about-ink);
  margin-bottom: 12px;
}

.page-about .about-data-card-text {
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(26, 26, 26, 0.78);
  margin: 0 0 16px;
}

.page-about .about-data-card-list {
  margin: 0;
  padding: 0;
  list-style: none;
}

.page-about .about-data-card-list li {
  position: relative;
  padding-left: 18px;
  font-size: 0.875rem;
  line-height: 1.75;
  color: rgba(26, 26, 26, 0.72);
}

.page-about .about-data-card-list li::before {
  content: "";
  position: absolute;
  left: 0;
  top: 11px;
  width: 8px;
  height: 8px;
  background: var(--about-gold);
  transform: rotate(45deg);
}

/* ============ 团队与文化 ============ */
.page-about .about-team-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .about-team-visual {
  background: var(--about-bg-deep);
  border: 1px solid rgba(201, 162, 39, 0.3);
}

.page-about .about-team-visual img {
  width: 100%;
  height: auto;
  object-fit: cover;
}

.page-about .about-team-copy {
  background: var(--about-white);
  border: 1px solid rgba(11, 61, 46, 0.08);
  padding: 32px 28px;
}

.page-about .about-team-text {
  font-size: 1rem;
  line-height: 1.85;
  color: rgba(26, 26, 26, 0.84);
  margin: 0 0 16px;
}

.page-about .about-team-strong {
  font-family: var(--about-font-heading);
  color: var(--about-bg-deep);
  margin-right: 4px;
  position: relative;
}

.page-about .about-team-strong::after {
  content: "";
  position: absolute;
  left: 0;
  bottom: -2px;
  width: 100%;
  height: 2px;
  background: var(--about-gold);
}

.page-about .about-team-roster {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 16px;
  margin-top: 28px;
  border-top: 1px solid rgba(11, 61, 46, 0.12);
  padding-top: 24px;
}

.page-about .about-roster-item {
  background: var(--about-cream);
  border-left: 3px solid var(--about-bg-deep);
  padding: 18px 16px;
}

.page-about .about-roster-count {
  display: block;
  font-family: var(--about-font-mono);
  font-size: 1.5rem;
  font-weight: 700;
  color: var(--about-bg-deep);
  line-height: 1.2;
}

.page-about .about-roster-role {
  display: block;
  font-size: 0.8125rem;
  color: rgba(26, 26, 26, 0.68);
  margin-top: 4px;
}

/* ============ CTA 区块 ============ */
.page-about .about-cta {
  margin-top: 16px;
}

.page-about .about-cta-card {
  background: var(--about-bg-deep);
  padding: 48px 32px;
  text-align: left;
  position: relative;
  overflow: hidden;
  border-bottom: 4px solid var(--about-gold);
}

.page-about .about-cta-card::before {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  width: 180px;
  height: 180px;
  background: radial-gradient(circle, rgba(201, 162, 39, 0.18) 0%, transparent 70%);
}

.page-about .about-cta-label {
  font-family: var(--about-font-mono);
  font-size: 0.8125rem;
  letter-spacing: 0.1em;
  color: var(--about-gold);
  margin: 0 0 12px;
}

.page-about .about-cta-title {
  font-size: 1.375rem;
  color: var(--about-white);
  margin-bottom: 8px;
}

.page-about .about-cta-text {
  font-size: 0.9375rem;
  color: rgba(255, 255, 255, 0.72);
  margin: 0 0 24px;
}

/* ============ 桌面端 ≥ 768px ============ */
@media (min-width: 768px) {
  .page-about .about-hero {
    padding: 104px 0 80px;
  }

  .page-about .about-hero-inner {
    grid-template-columns: 1.08fr 0.92fr;
    gap: 64px;
    align-items: center;
  }

  .page-about .about-hero-title {
    font-size: 2.875rem;
  }

  .page-about .about-hero-meta {
    grid-template-columns: repeat(4, 1fr);
  }

  .page-about .about-hero-stat {
    padding-left: 16px;
  }

  .page-about .about-hero-stat-num {
    font-size: 2rem;
  }

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

  .page-about .about-body {
    padding: 72px 0 96px;
  }

  .page-about .about-layout {
    grid-template-columns: 220px 1fr;
    gap: 64px;
    align-items: start;
  }

  .page-about .about-sidebar {
    display: block;
    position: sticky;
    top: 96px;
    border-left: 3px solid var(--about-gold);
    padding: 8px 0 8px 22px;
  }

  .page-about .about-sidebar-label {
    font-family: var(--about-font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.14em;
    color: var(--about-sage);
    margin: 0 0 18px;
  }

  .page-about .about-sidebar-list {
    list-style: none;
    margin: 0 0 24px;
    padding: 0;
  }

  .page-about .about-sidebar-link {
    display: block;
    font-size: 0.875rem;
    font-weight: 700;
    color: rgba(26, 26, 26, 0.68);
    padding: 8px 0;
    border-bottom: 1px dotted rgba(11, 61, 46, 0.15);
    letter-spacing: 0.03em;
    transition: color 0.2s ease, padding-left 0.2s ease, border-color 0.2s ease;
  }

  .page-about .about-sidebar-link:hover {
    color: var(--about-gold);
    padding-left: 6px;
    border-bottom-color: var(--about-gold);
  }

  .page-about .about-sidebar-note {
    background: var(--about-white);
    border: 1px solid rgba(11, 61, 46, 0.1);
    padding: 16px;
  }

  .page-about .about-sidebar-note-label {
    font-family: var(--about-font-mono);
    font-size: 0.75rem;
    letter-spacing: 0.1em;
    color: var(--about-gold);
    margin: 0 0 8px;
  }

  .page-about .about-sidebar-note-text {
    font-size: 0.8125rem;
    line-height: 1.7;
    color: rgba(26, 26, 26, 0.7);
    margin: 0;
  }

  .page-about .about-section-title {
    font-size: 1.875rem;
  }

  .page-about .about-mission-block {
    grid-template-columns: 5fr 4fr;
    gap: 36px;
    align-items: start;
  }

  .page-about .about-mission-principle {
    padding: 36px 30px;
  }

  .page-about .about-mission-values {
    gap: 16px;
  }

  .page-about .about-timeline {
    padding-left: 32px;
  }

  .page-about .about-timeline::before {
    left: 10px;
  }

  .page-about .about-timeline-dot {
    left: -32px;
    width: 16px;
    height: 16px;
  }

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

  .page-about .about-tech-layout {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 36px;
    align-items: start;
  }

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

  .page-about .about-team-layout {
    grid-template-columns: 0.9fr 1.1fr;
    gap: 36px;
    align-items: start;
  }

  .page-about .about-team-copy {
    padding: 36px 30px;
  }

  .page-about .about-cta-card {
    padding: 56px 48px;
    text-align: center;
  }

  .page-about .about-cta-title {
    font-size: 1.625rem;
  }
}

/* ============ 桌面端 ≥ 1024px ============ */
@media (min-width: 1024px) {
  .page-about .about-hero-inner {
    gap: 80px;
  }

  .page-about .about-layout {
    grid-template-columns: 240px 1fr;
    gap: 72px;
  }

  .page-about .about-sidebar-link {
    font-size: 0.9375rem;
  }
}