.page-about {
  --about-primary: #FF6B00;
  --about-secondary: #00C4FF;
  --about-bg: #F6F1E7;
  --about-surface: #FFFCF7;
  --about-text: #1A1A1A;
  --about-text-sub: #4A3F35;
  --about-border: #2B2118;
  --about-line: #D6CABB;
  --about-success: #1F9D55;
  --about-warning: #F5A623;
  --about-alert: #E62E2E;
  --about-shadow-hard: 6px 6px 0 var(--about-border);
  --about-font-display: "Barlow Condensed", "Oswald", "Noto Sans SC", sans-serif;
  --about-font-body: "Inter", "Noto Sans SC", "PingFang SC", sans-serif;
  --about-font-mono: "JetBrains Mono", "SFMono-Regular", monospace;
  background-color: var(--about-bg);
  color: var(--about-text);
  font-family: var(--about-font-body);
  overflow-x: clip;
}

.page-about .breadcrumbs {
  max-width: 1280px;
  margin: 0 auto;
  padding: 16px 24px 0;
}

.page-about .breadcrumbs ol {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  list-style: none;
  margin: 0;
  padding: 0;
  font-size: 14px;
  color: var(--about-text-sub);
}

.page-about .breadcrumbs li {
  display: flex;
  align-items: center;
  gap: 8px;
}

.page-about .breadcrumbs li + li::before {
  content: "/";
  color: var(--about-line);
}

.page-about .breadcrumbs a {
  color: var(--about-text-sub);
  text-decoration: none;
  border-bottom: 1px solid transparent;
  transition: border-color 0.2s ease, color 0.2s ease;
}

.page-about .breadcrumbs a:hover {
  color: var(--about-primary);
  border-bottom-color: var(--about-primary);
}

.page-about .breadcrumbs [aria-current="page"] {
  color: var(--about-primary);
  font-weight: 600;
}

/* Hero */
.page-about .about-hero {
  max-width: 1280px;
  margin: 0 auto;
  padding: 40px 24px 56px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

.page-about .about-hero__left {
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.page-about .about-hero__kicker {
  font-family: var(--about-font-mono);
  font-size: 13px;
  letter-spacing: 0.12em;
  color: var(--about-primary);
  text-transform: uppercase;
  margin: 0 0 16px;
  padding: 4px 12px;
  background: var(--about-surface);
  border: 2px solid var(--about-border);
  box-shadow: 3px 3px 0 var(--about-border);
}

.page-about .about-hero h1 {
  font-family: var(--about-font-display);
  font-size: 40px;
  line-height: 1.05;
  font-weight: 800;
  margin: 0 0 20px;
  max-width: 640px;
  letter-spacing: -0.01em;
  color: var(--about-text);
}

.page-about .about-hero__lead {
  font-size: 17px;
  line-height: 1.7;
  color: var(--about-text-sub);
  max-width: 560px;
  margin: 0 0 28px;
}

.page-about .about-hero .btn {
  display: inline-block;
  font-family: var(--about-font-body);
  font-size: 15px;
  font-weight: 700;
  text-decoration: none;
  padding: 12px 24px;
  border: 2px solid var(--about-border);
  border-radius: 0;
  transition: transform 0.2s ease, box-shadow 0.2s ease, background-color 0.2s ease, color 0.2s ease;
}

.page-about .about-hero .btn-primary {
  background: var(--about-primary);
  color: #FFFFFF;
  box-shadow: 4px 4px 0 var(--about-border);
}

.page-about .about-hero .btn-primary:hover {
  background: var(--about-border);
  color: var(--about-surface);
  transform: translate(2px, 2px);
  box-shadow: 2px 2px 0 var(--about-border);
}

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

.page-about .about-hero__plate {
  background: var(--about-border);
  color: var(--about-surface);
  padding: 24px 16px;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
  min-height: 130px;
  box-shadow: var(--about-shadow-hard);
  position: relative;
}

.page-about .about-hero__plate::before {
  content: "ARCHIVE";
  position: absolute;
  top: 12px;
  right: 12px;
  font-family: var(--about-font-mono);
  font-size: 10px;
  letter-spacing: 0.1em;
  color: rgba(255, 255, 255, 0.55);
}

.page-about .about-hero__plate--alt {
  background: var(--about-primary);
  color: var(--about-border);
}

.page-about .about-hero__plate--alt::before {
  color: rgba(43, 33, 24, 0.65);
}

.page-about .about-hero__plate-num {
  font-family: var(--about-font-display);
  font-size: 40px;
  font-weight: 800;
  line-height: 1;
  margin-bottom: 8px;
}

.page-about .about-hero__plate-label {
  font-size: 13px;
  font-weight: 500;
  opacity: 0.85;
}

/* Section shared rail */
.page-about .about-section {
  max-width: 1280px;
  margin: 0 auto;
  padding: 72px 24px;
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  position: relative;
}

.page-about .about-section__rail {
  display: flex;
  align-items: baseline;
  gap: 12px;
  position: relative;
}

.page-about .about-section__index {
  font-family: var(--about-font-display);
  font-size: 64px;
  font-weight: 800;
  line-height: 1;
  color: var(--about-primary);
}

.page-about .about-section__label {
  font-family: var(--about-font-mono);
  font-size: 13px;
  letter-spacing: 0.1em;
  text-transform: uppercase;
  color: var(--about-text-sub);
  border: 2px solid var(--about-border);
  background: var(--about-surface);
  padding: 4px 10px;
  box-shadow: 2px 2px 0 var(--about-border);
}

.page-about .about-section h2 {
  font-family: var(--about-font-display);
  font-size: 30px;
  line-height: 1.15;
  font-weight: 800;
  margin: 0 0 16px;
  color: var(--about-text);
}

/* 品牌切片 */
.page-about .about-slice {
  background: linear-gradient(135deg, var(--about-bg) 0%, var(--about-surface) 55%, var(--about-bg) 100%);
  border-top: 2px solid var(--about-border);
  border-bottom: 2px solid var(--about-border);
}

.page-about .about-slice__content {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
  align-items: center;
}

.page-about .about-slice__text p {
  font-size: 16px;
  line-height: 1.75;
  color: var(--about-text-sub);
  margin: 0 0 16px;
}

.page-about .about-slice__text strong {
  color: var(--about-text);
  font-weight: 700;
}

.page-about .about-slice__media img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--about-border);
  box-shadow: 6px 6px 0 var(--about-border);
}

/* 时间轴 */
.page-about .about-timeline {
  background: var(--about-text);
  color: var(--about-surface);
  border-top: 4px solid var(--about-primary);
  border-bottom: 4px solid var(--about-primary);
  padding: 72px 24px;
  max-width: none;
}

.page-about .about-timeline .about-section__label {
  background: var(--about-primary);
  color: var(--about-border);
  border-color: var(--about-border);
}

.page-about .about-timeline .about-section__index {
  color: var(--about-primary);
}

.page-about .about-timeline h2 {
  color: var(--about-surface);
}

.page-about .about-timeline__intro {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 252, 247, 0.78);
  margin: 0 0 40px;
  max-width: 600px;
}

.page-about .timeline-list {
  list-style: none;
  margin: 0;
  padding: 0;
  position: relative;
}

.page-about .timeline-list::before {
  content: "";
  position: absolute;
  left: 12px;
  top: 8px;
  bottom: 8px;
  width: 2px;
  background: rgba(255, 255, 255, 0.3);
}

.page-about .timeline-item {
  position: relative;
  padding: 0 0 32px 44px;
}

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

.page-about .timeline-item__marker {
  position: absolute;
  left: 0;
  top: 2px;
  display: flex;
  flex-direction: column;
  align-items: center;
}

.page-about .timeline-item__dot {
  width: 24px;
  height: 24px;
  border-radius: 50%;
  background: var(--about-primary);
  border: 2px solid var(--about-surface);
  box-shadow: 0 0 0 2px var(--about-primary);
  transition: transform 0.2s ease, box-shadow 0.2s ease;
  cursor: pointer;
}

.page-about .timeline-item__dot:hover {
  transform: scale(1.15);
  box-shadow: 0 0 0 4px var(--about-secondary), 0 0 0 6px rgba(0, 196, 255, 0.25);
}

.page-about .timeline-item__file-num {
  font-family: var(--about-font-mono);
  font-size: 10px;
  color: rgba(255, 252, 247, 0.6);
  margin-top: 6px;
  writing-mode: vertical-rl;
  letter-spacing: 0.08em;
}

.page-about .timeline-item__body {
  background: rgba(255, 255, 255, 0.06);
  border: 1px solid rgba(255, 252, 247, 0.18);
  border-left: 3px solid var(--about-primary);
  padding: 20px 20px;
  transition: background-color 0.2s ease, border-color 0.2s ease;
}

.page-about .timeline-item__body:hover {
  background: rgba(255, 255, 255, 0.1);
  border-left-color: var(--about-secondary);
}

.page-about .timeline-item__body h3 {
  font-family: var(--about-font-display);
  font-size: 22px;
  line-height: 1.2;
  font-weight: 700;
  margin: 0 0 10px;
  color: var(--about-surface);
}

.page-about .timeline-item__body p {
  font-size: 15px;
  line-height: 1.7;
  color: rgba(255, 252, 247, 0.78);
  margin: 0;
}

/* 服务原则 */
.page-about .about-principles {
  background: var(--about-bg);
}

.page-about .principles-window {
  display: flex;
  flex-direction: column;
  gap: 40px;
}

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

.page-about .principle-card {
  background: var(--about-surface);
  border: 2px solid var(--about-border);
  box-shadow: var(--about-shadow-hard);
  padding: 28px 24px;
  transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.page-about .principle-card:hover {
  transform: translate(-2px, -2px);
  box-shadow: 8px 8px 0 var(--about-border);
}

.page-about .principle-card__num {
  font-family: var(--about-font-mono);
  font-size: 13px;
  color: var(--about-primary);
  display: block;
  margin-bottom: 8px;
}

.page-about .principle-card h3 {
  font-family: var(--about-font-display);
  font-size: 26px;
  line-height: 1.15;
  font-weight: 800;
  margin: 0 0 10px;
}

.page-about .principle-card p {
  font-size: 15px;
  line-height: 1.7;
  color: var(--about-text-sub);
  margin: 0;
}

.page-about .principles-image img {
  display: block;
  width: 100%;
  max-width: 100%;
  height: auto;
  border: 2px solid var(--about-border);
  box-shadow: 6px 6px 0 var(--about-border);
}

/* 协作生态 */
.page-about .about-eco {
  background: var(--about-text);
  color: var(--about-surface);
  border-top: 2px solid var(--about-primary);
  border-bottom: 2px solid var(--about-primary);
  padding: 72px 24px;
  max-width: none;
}

.page-about .about-eco .about-section__label {
  background: var(--about-primary);
  color: var(--about-border);
  border-color: var(--about-border);
}

.page-about .about-eco h2 {
  color: var(--about-surface);
}

.page-about .about-eco__lead {
  font-size: 16px;
  line-height: 1.7;
  color: rgba(255, 252, 247, 0.8);
  margin: 0 0 36px;
  max-width: 600px;
}

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

.page-about .eco-item {
  background: rgba(255, 255, 255, 0.05);
  border: 1px solid rgba(255, 252, 247, 0.15);
  padding: 24px;
  position: relative;
}

.page-about .eco-item::before {
  content: "//";
  position: absolute;
  top: 16px;
  right: 16px;
  font-family: var(--about-font-mono);
  color: var(--about-primary);
  font-size: 18px;
}

.page-about .eco-item h3 {
  font-family: var(--about-font-display);
  font-size: 20px;
  font-weight: 700;
  margin: 0 0 8px;
  color: var(--about-surface);
}

.page-about .eco-item p {
  font-size: 14px;
  line-height: 1.7;
  color: rgba(255, 252, 247, 0.75);
  margin: 0;
}

/* 合规与联系 */
.page-about .about-compliance {
  background: var(--about-surface);
  border-top: 4px solid var(--about-border);
}

.page-about .compliance-wrap {
  display: grid;
  grid-template-columns: 1fr;
  gap: 36px;
}

.page-about .compliance-info {
  display: flex;
  flex-direction: column;
  gap: 28px;
}

.page-about .compliance-block {
  border: 2px solid var(--about-border);
  border-left: 6px solid var(--about-primary);
  padding: 24px;
  background: var(--about-bg);
}

.page-about .compliance-block h3 {
  font-family: var(--about-font-display);
  font-size: 22px;
  font-weight: 700;
  margin: 0 0 12px;
}

.page-about .compliance-icp {
  font-family: var(--about-font-mono);
  font-size: 16px;
  font-weight: 600;
  margin: 0 0 8px;
  color: var(--about-text);
}

.page-about .compliance-block p {
  font-size: 14px;
  line-height: 1.65;
  color: var(--about-text-sub);
  margin: 0;
}

.page-about .compliance-contact-list {
  list-style: none;
  margin: 0 0 12px;
  padding: 0;
}

.page-about .compliance-contact-list li {
  display: flex;
  flex-direction: column;
  gap: 2px;
  padding: 10px 0;
  border-bottom: 1px solid var(--about-line);
  font-size: 14px;
}

.page-about .compliance-contact-list li:last-child {
  border-bottom: none;
}

.page-about .compliance-contact-list li span {
  font-family: var(--about-font-mono);
  font-size: 11px;
  letter-spacing: 0.08em;
  color: var(--about-primary);
  text-transform: uppercase;
}

.page-about .compliance-contact-list a {
  color: var(--about-text);
  font-weight: 600;
  text-decoration: none;
  border-bottom: 1px solid var(--about-secondary);
  transition: color 0.2s ease, border-color 0.2s ease;
}

.page-about .compliance-contact-list a:hover {
  color: var(--about-primary);
  border-bottom-color: var(--about-primary);
}

.page-about .compliance-note {
  font-size: 13px;
  line-height: 1.6;
  color: var(--about-text-sub);
  margin: 8px 0 0;
  padding-top: 12px;
  border-top: 1px dashed var(--about-line);
}

.page-about .compliance-seal img {
  display: block;
  width: 100%;
  max-width: 400px;
  height: auto;
  margin: 0 auto;
  border: 2px solid var(--about-border);
  box-shadow: 6px 6px 0 var(--about-border);
}

/* Tablet+ */
@media (min-width: 700px) {
  .page-about .about-hero {
    grid-template-columns: 1.2fr 0.8fr;
    padding: 64px 32px 80px;
    gap: 48px;
  }

  .page-about .about-hero h1 {
    font-size: 52px;
  }

  .page-about .about-section {
    grid-template-columns: 160px 1fr;
    gap: 40px;
    padding: 88px 32px;
  }

  .page-about .about-section__rail {
    flex-direction: column;
    align-items: flex-start;
  }

  .page-about .about-slice__content {
    grid-template-columns: 1.1fr 0.9fr;
    gap: 48px;
  }

  .page-about .timeline-list::before {
    left: 14px;
  }

  .page-about .timeline-item {
    padding-left: 56px;
  }

  .page-about .timeline-item__body {
    padding: 24px 28px;
  }

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

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

  .page-about .compliance-wrap {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: start;
  }

  .page-about .compliance-contact-list li {
    flex-direction: row;
    gap: 12px;
    justify-content: space-between;
    align-items: baseline;
  }

  .page-about .compliance-contact-list li span {
    flex-shrink: 0;
  }
}

@media (min-width: 1080px) {
  .page-about .about-hero {
    padding: 72px 40px 96px;
  }

  .page-about .about-hero h1 {
    font-size: 64px;
  }

  .page-about .about-hero__plate-num {
    font-size: 48px;
  }

  .page-about .about-section {
    grid-template-columns: 200px 1fr;
    padding: 104px 40px;
  }

  .page-about .about-section__index {
    font-size: 80px;
  }

  .page-about .about-section h2 {
    font-size: 38px;
    margin-bottom: 20px;
  }

  .page-about .about-timeline {
    padding: 104px 40px;
  }
}