.page-about {
  --ab-page-bg: #0D1424;
  --ab-hero-bg: #121A2C;
  --ab-card-bg: #1A2233;
  --ab-card-border: rgba(0, 229, 255, 0.16);
  --ab-line-glow: rgba(0, 229, 255, 0.22);
  --ab-accent-soft: rgba(0, 229, 255, 0.10);
  --ab-moss: #6FA37A;
  --ab-terra: #C67B5C;
  --ab-text-dim: #9AA7B8;
  background: var(--ab-page-bg);
  color: #E8F0F8;
  overflow-x: hidden;
}

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

.page-about .ab-container {
  width: 100%;
  max-width: 1240px;
  margin: 0 auto;
  padding: 0 20px;
  box-sizing: border-box;
}

/* ---------- 首屏 ---------- */
.page-about .ab-hero {
  position: relative;
  padding: 40px 0 56px;
  background:
    linear-gradient(120deg, var(--ab-accent-soft) 0%, transparent 46%),
    var(--ab-hero-bg);
  border-bottom: 1px solid var(--ab-card-border);
  overflow: hidden;
}

.page-about .ab-hero::before {
  content: "";
  position: absolute;
  top: -80px;
  right: -60px;
  width: 360px;
  height: 360px;
  background: radial-gradient(circle, rgba(0, 229, 255, 0.10), transparent 70%);
  pointer-events: none;
}

.page-about .breadcrumbs {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-bottom: 28px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 13px;
  letter-spacing: 0.05em;
  color: var(--ab-text-dim);
}

.page-about .breadcrumbs a {
  color: var(--accent);
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  text-decoration: underline;
}

.page-about .ab-crumb-sep {
  opacity: 0.5;
}

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

.page-about .ab-hero-copy {
  display: flex;
  flex-direction: column;
}

.page-about .ab-hero-kicker {
  margin: 0 0 6px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 13px;
  letter-spacing: 0.22em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .ab-hero-title {
  margin: 0 0 16px;
  font-family: "Orbitron", "Rajdhani", "Noto Sans SC", sans-serif;
  font-size: 30px;
  line-height: 1.25;
  letter-spacing: 0.02em;
  color: #E8F0F8;
}

.page-about .ab-hero-lead {
  margin: 0 0 28px;
  max-width: 32em;
  font-size: 16px;
  line-height: 1.8;
  color: var(--ab-text-dim);
}

.page-about .ab-hero-stats {
  display: grid;
  grid-template-columns: repeat(2, 1fr);
  gap: 12px;
}

.page-about .ab-stat {
  display: flex;
  flex-direction: column;
  gap: 4px;
  padding: 16px;
  background: rgba(26, 34, 51, 0.72);
  border: 1px solid var(--ab-card-border);
  border-radius: 6px;
}

.page-about .ab-stat-num {
  font-family: "Orbitron", "Rajdhani", "Noto Sans SC", sans-serif;
  font-size: 28px;
  font-weight: 700;
  color: var(--accent);
}

.page-about .ab-stat-unit {
  font-size: 16px;
  color: var(--accent-2);
}

.page-about .ab-stat-label {
  font-size: 13px;
  color: var(--ab-text-dim);
}

.page-about .ab-hero-figure {
  position: relative;
  margin: 0;
  border: 1px solid var(--ab-card-border);
  border-radius: 8px;
  overflow: hidden;
  background: #101827;
}

.page-about .ab-hero-img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: 8px;
}

/* ---------- 档案章节布局 ---------- */
.page-about .ab-dossier {
  padding: 56px 0 72px;
}

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

.page-about .ab-rail {
  position: static;
}

.page-about .ab-chapter-nav {
  padding: 20px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-card-border);
  border-radius: 8px;
}

.page-about .ab-chapter-label {
  margin: 0 0 12px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 12px;
  letter-spacing: 0.18em;
  text-transform: uppercase;
  color: var(--accent);
}

.page-about .ab-chapter-list {
  list-style: none;
  margin: 0 0 14px;
  padding: 0;
  display: flex;
  flex-wrap: wrap;
  gap: 6px;
}

.page-about .ab-chapter-link {
  display: inline-block;
  padding: 6px 10px;
  font-size: 14px;
  line-height: 1.4;
  color: var(--ab-text-dim);
  text-decoration: none;
  border: 1px solid transparent;
  border-radius: 4px;
  transition: color 0.2s, border-color 0.2s, background 0.2s;
}

.page-about .ab-chapter-link:hover,
.page-about .ab-chapter-link[data-active] {
  color: var(--accent);
  border-color: var(--ab-card-border);
  background: var(--ab-accent-soft);
}

.page-about .ab-rail-more {
  display: inline-block;
  font-size: 14px;
  color: var(--accent-2);
  text-decoration: none;
}

.page-about .ab-rail-more:hover {
  text-decoration: underline;
}

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

/* ---------- 章节通用 ---------- */
.page-about .ab-section {
  position: relative;
  margin-bottom: 64px;
  padding-top: 8px;
}

.page-about .ab-section-index {
  margin: 0 0 8px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 14px;
  letter-spacing: 0.2em;
  color: var(--accent);
}

.page-about .ab-section-title {
  margin: 0 0 10px;
  font-family: "Orbitron", "Rajdhani", "Noto Sans SC", sans-serif;
  font-size: 26px;
  line-height: 1.3;
  color: #E8F0F8;
}

.page-about .ab-section-lead {
  margin: 0 0 24px;
  font-size: 16px;
  line-height: 1.6;
  color: var(--ab-text-dim);
}

.page-about .ab-paragraph {
  margin: 0 0 16px;
  font-size: 15px;
  line-height: 1.85;
  color: #E8F0F8;
}

/* ---------- 品牌概述 ---------- */
.page-about .ab-note-list {
  display: grid;
  gap: 10px;
  margin-top: 26px;
}

.page-about .ab-note {
  margin: 0;
  padding: 12px 16px;
  background: var(--ab-card-bg);
  border-left: 3px solid var(--accent);
  font-size: 14px;
  line-height: 1.6;
  color: var(--ab-text-dim);
}

.page-about .ab-note strong {
  margin-right: 8px;
  font-weight: 600;
  color: var(--accent-2);
}

/* ---------- 里程碑时间线 ---------- */
.page-about .ab-milestone-cover {
  margin: 0 0 36px;
  border: 1px solid var(--ab-card-border);
  border-radius: 8px;
  overflow: hidden;
  background: #101827;
}

.page-about .ab-milestone-cover img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: 8px;
}

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

.page-about .ab-timeline::before {
  content: "";
  position: absolute;
  left: 9px;
  top: 6px;
  bottom: 6px;
  width: 2px;
  background: linear-gradient(
    180deg,
    var(--accent) 0%,
    rgba(0, 229, 255, 0.18) 35%,
    var(--ab-moss) 90%
  );
}

.page-about .ab-timeline-item {
  position: relative;
  padding: 0 0 26px 40px;
}

.page-about .ab-timeline-marker {
  position: absolute;
  left: 2px;
  top: 6px;
  width: 16px;
  height: 16px;
  border-radius: 50%;
  background: var(--ab-page-bg);
  border: 2px solid var(--accent);
  box-shadow: 0 0 12px rgba(0, 229, 255, 0.5);
  z-index: 1;
  transition: background 0.2s, transform 0.2s;
}

.page-about .ab-timeline-item:hover .ab-timeline-marker {
  background: var(--accent);
  transform: scale(1.12);
}

.page-about .ab-timeline-item.is-current .ab-timeline-marker {
  border-color: var(--accent-3);
  box-shadow: 0 0 14px rgba(255, 92, 0, 0.55);
}

.page-about .ab-timeline-tag {
  display: inline-block;
  margin: 0 0 8px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 12px;
  letter-spacing: 0.14em;
  text-transform: uppercase;
  color: var(--accent-2);
}

.page-about .ab-timeline-box {
  padding: 18px 20px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-card-border);
  border-radius: 6px;
  transition: border-color 0.2s, transform 0.2s;
}

.page-about .ab-timeline-item:hover .ab-timeline-box {
  border-color: rgba(0, 229, 255, 0.28);
  transform: translateX(4px);
}

.page-about .ab-timeline-item.is-current .ab-timeline-box {
  border-color: rgba(255, 92, 0, 0.35);
}

.page-about .ab-timeline-box h3 {
  margin: 0 0 8px;
  font-size: 17px;
  line-height: 1.4;
  color: #E8F0F8;
}

.page-about .ab-timeline-box p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-text-dim);
}

/* ---------- 专家团队 ---------- */
.page-about .ab-expert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 16px;
}

.page-about .ab-expert-card {
  position: relative;
  padding: 28px 24px;
  background: var(--ab-card-bg);
  border: 1px solid rgba(111, 163, 122, 0.28);
  border-radius: 6px;
  overflow: hidden;
  transition: border-color 0.2s, transform 0.2s;
}

.page-about .ab-expert-card::after {
  content: "";
  position: absolute;
  inset: 0;
  pointer-events: none;
  background: linear-gradient(160deg, rgba(245, 239, 224, 0.04), transparent 55%);
}

.page-about .ab-expert-card:hover {
  border-color: var(--ab-moss);
  transform: translateY(-3px);
}

.page-about .ab-expert-icon {
  width: 46px;
  height: 46px;
  margin-bottom: 18px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--ab-accent-soft);
  border: 1px solid var(--ab-card-border);
  color: var(--accent);
  transition: box-shadow 0.2s;
}

.page-about .ab-expert-card:hover .ab-expert-icon {
  box-shadow: 0 0 18px rgba(0, 229, 255, 0.25);
}

.page-about .ab-expert-card h3 {
  margin: 0 0 10px;
  font-size: 17px;
  line-height: 1.4;
  color: #E8F0F8;
}

.page-about .ab-expert-card p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-text-dim);
}

.page-about .ab-expert-footnote {
  margin: 20px 0 0;
  padding: 12px 16px;
  background: rgba(111, 163, 122, 0.08);
  border-left: 3px solid var(--ab-moss);
  font-size: 13px;
  line-height: 1.7;
  color: var(--ab-text-dim);
}

/* ---------- 技术保障 ---------- */
.page-about .ab-tech-layout {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
}

.page-about .ab-tech-list {
  display: grid;
  gap: 12px;
}

.page-about .ab-tech-item {
  display: grid;
  grid-template-columns: 48px 1fr;
  gap: 14px;
  align-items: start;
  padding: 16px;
  background: var(--ab-card-bg);
  border: 1px solid var(--ab-card-border);
  border-radius: 6px;
  transition: border-color 0.2s, background 0.2s;
}

.page-about .ab-tech-item:hover {
  border-color: rgba(0, 229, 255, 0.28);
  background: rgba(26, 34, 51, 0.85);
}

.page-about .ab-tech-icon {
  width: 48px;
  height: 48px;
  display: grid;
  place-items: center;
  border-radius: 8px;
  background: var(--ab-accent-soft);
  border: 1px solid var(--ab-card-border);
  color: var(--accent);
  transition: box-shadow 0.2s;
}

.page-about .ab-tech-item:hover .ab-tech-icon {
  box-shadow: 0 0 16px rgba(0, 229, 255, 0.2);
}

.page-about .ab-tech-item h3 {
  margin: 2px 0 6px;
  font-size: 16px;
  line-height: 1.4;
  color: #E8F0F8;
}

.page-about .ab-tech-item p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-text-dim);
}

.page-about .ab-tech-visual {
  border: 1px solid var(--ab-card-border);
  border-radius: 8px;
  overflow: hidden;
  background: #101827;
}

.page-about .ab-tech-visual img {
  display: block;
  width: 100%;
  object-fit: cover;
  border-radius: 8px;
}

.page-about .ab-tech-notes {
  margin-top: 20px;
  padding: 18px 20px;
  border: 1px dashed rgba(0, 229, 255, 0.22);
  border-radius: 6px;
  background: rgba(0, 229, 255, 0.04);
  font-size: 14px;
  line-height: 1.8;
  color: #E8F0F8;
}

.page-about .ab-tech-notes strong {
  margin-right: 8px;
  color: var(--accent);
}

/* ---------- 品牌理念 ---------- */
.page-about .ab-manifesto {
  margin: 0 0 32px;
  padding: 28px 24px 28px 28px;
  background:
    linear-gradient(120deg, rgba(0, 229, 255, 0.10), transparent 60%),
    var(--ab-card-bg);
  border-left: 4px solid var(--accent);
  border-radius: 6px;
  font-family: "Orbitron", "Rajdhani", "Noto Sans SC", sans-serif;
  font-size: 18px;
  line-height: 1.7;
  color: #E8F0F8;
}

.page-about .ab-value-row {
  display: grid;
  grid-template-columns: 1fr;
  gap: 14px;
  margin-bottom: 32px;
}

.page-about .ab-value {
  position: relative;
  padding: 22px;
  background: var(--ab-card-bg);
  border-radius: 6px;
  border-top: 3px solid var(--ab-moss);
}

.page-about .ab-value:nth-child(2) {
  border-top-color: var(--accent);
}

.page-about .ab-value:nth-child(3) {
  border-top-color: var(--ab-terra);
}

.page-about .ab-value-num {
  display: block;
  margin-bottom: 10px;
  font-family: "IBM Plex Mono", "Courier New", monospace;
  font-size: 14px;
  color: var(--accent-2);
}

.page-about .ab-value h3 {
  margin: 0 0 8px;
  font-family: "Orbitron", "Rajdhani", "Noto Sans SC", sans-serif;
  font-size: 20px;
  color: #E8F0F8;
}

.page-about .ab-value p {
  margin: 0;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-text-dim);
}

.page-about .ab-philosophy-cta {
  display: flex;
  flex-wrap: wrap;
  gap: 14px;
  margin-bottom: 36px;
}

.page-about .ab-philosophy-cta a.btn {
  text-decoration: none;
}

/* ---------- 信任块 ---------- */
.page-about .ab-trust {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 14px;
  padding: 22px 24px;
  background: rgba(111, 163, 122, 0.08);
  border: 1px solid rgba(111, 163, 122, 0.28);
  border-radius: 6px;
}

.page-about .ab-trust-text {
  margin: 0;
  max-width: 42em;
  font-size: 14px;
  line-height: 1.7;
  color: var(--ab-text-dim);
}

.page-about .ab-trust-link {
  font-size: 14px;
  color: var(--accent-2);
  text-decoration: none;
  white-space: nowrap;
}

.page-about .ab-trust-link:hover {
  text-decoration: underline;
}

/* ---------- 桌面端 ---------- */
@media (min-width: 768px) {
  .page-about .ab-hero-title {
    font-size: 38px;
  }

  .page-about .ab-hero-lead {
    font-size: 17px;
  }

  .page-about .ab-hero-stats {
    grid-template-columns: repeat(4, 1fr);
    gap: 14px;
  }

  .page-about .ab-expert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .ab-value-row {
    grid-template-columns: repeat(3, 1fr);
    gap: 18px;
  }

  .page-about .ab-manifesto {
    padding: 36px 44px 36px 52px;
    font-size: 22px;
  }

  .page-about .ab-timeline-item {
    padding-left: 52px;
  }

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

  .page-about .ab-timeline-marker {
    left: 3px;
  }
}

@media (min-width: 1024px) {
  .page-about .ab-hero {
    padding: 52px 0 64px;
  }

  .page-about .ab-hero-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 1fr);
    gap: 48px;
  }

  .page-about .ab-hero-title {
    font-size: 42px;
    line-height: 1.2;
  }

  .page-about .ab-dossier {
    padding: 64px 0 84px;
  }

  .page-about .ab-layout {
    grid-template-columns: 220px minmax(0, 1fr);
    gap: 52px;
  }

  .page-about .ab-rail {
    position: sticky;
    top: 28px;
    align-self: start;
  }

  .page-about .ab-chapter-list {
    display: flex;
    flex-direction: column;
    gap: 2px;
  }

  .page-about .ab-chapter-link {
    display: block;
  }

  .page-about .ab-section-title {
    font-size: 32px;
  }

  .page-about .ab-tech-layout {
    grid-template-columns: minmax(0, 1.15fr) minmax(0, 0.85fr);
    gap: 28px;
    align-items: center;
  }

  .page-about .ab-tech-list {
    gap: 14px;
  }
}