.page-about {
  background: #0A1F44;
  color: #F0F4FF;
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
}

.page-about .container {
  position: relative;
  z-index: 1;
}

.page-about section[id] {
  scroll-margin-top: calc(var(--header-h) + 16px);
}

/* ===== 首屏 ===== */
.about-hero {
  position: relative;
  overflow: hidden;
  padding: 48px 0 40px;
  background:
    radial-gradient(ellipse at 85% 20%, rgba(57, 255, 20, 0.08), transparent 55%),
    linear-gradient(160deg, #0A1F44 0%, #050D1A 100%);
  border-bottom: 1px solid #1C3A6E;
}

.about-hero::before {
  content: "";
  position: absolute;
  width: 520px;
  height: 520px;
  right: -160px;
  top: -160px;
  border-radius: 50%;
  background: radial-gradient(circle, rgba(57, 255, 20, 0.1), transparent 60%);
  pointer-events: none;
}

.about-hero::after {
  content: "";
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  background:
    linear-gradient(90deg, transparent 49.85%, rgba(57, 255, 20, 0.04) 50%, transparent 50.15%);
  background-size: 160px 100%;
  pointer-events: none;
}

.about-hero-inner {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
  align-items: center;
}

@media (min-width: 768px) {
  .about-hero {
    padding: 72px 0 56px;
  }
  .about-hero-inner {
    grid-template-columns: minmax(0, 1.1fr) minmax(0, 0.9fr);
    gap: 48px;
  }
}

.page-about .breadcrumbs {
  margin-bottom: 20px;
}

.page-about .breadcrumbs ol {
  display: flex;
  list-style: none;
  padding: 0;
  margin: 0;
}

.page-about .breadcrumbs li {
  font-size: 13px;
  color: #B0C4E4;
}

.page-about .breadcrumbs li + li::before {
  content: "·";
  margin: 0 8px;
  color: #1C3A6E;
}

.page-about .breadcrumbs a {
  color: #B0C4E4;
  text-decoration: none;
}

.page-about .breadcrumbs a:hover {
  color: #39FF14;
}

.about-hero h1 {
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
  font-size: 38px;
  line-height: 1.15;
  letter-spacing: 0.01em;
  color: #F0F4FF;
  margin: 0 0 20px;
}

@media (min-width: 768px) {
  .about-hero h1 {
    font-size: 56px;
  }
}

@media (min-width: 1200px) {
  .about-hero h1 {
    font-size: 64px;
  }
}

.hero-accent {
  display: block;
  font-size: 22px;
  line-height: 1.25;
  color: #FFD700;
  margin-top: 10px;
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
}

@media (min-width: 768px) {
  .hero-accent {
    font-size: 26px;
  }
}

.hero-lead {
  font-size: 16px;
  line-height: 1.9;
  color: #B0C4E4;
  max-width: 56ch;
  margin: 0 0 28px;
}

@media (min-width: 768px) {
  .hero-lead {
    font-size: 17px;
  }
}

.hero-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 12px;
  border-top: 1px solid #1C3A6E;
  padding-top: 24px;
  margin-bottom: 28px;
}

@media (min-width: 768px) {
  .hero-stats {
    gap: 24px;
  }
}

.stat-cell {
  border-left: 2px solid #1C3A6E;
  padding-left: 14px;
}

.stat-num {
  display: block;
  font-family: 'Roboto Mono', 'Consolas', monospace;
  font-size: 26px;
  font-weight: 700;
  line-height: 1.2;
  color: #39FF14;
}

@media (min-width: 768px) {
  .stat-num {
    font-size: 32px;
  }
}

.stat-label {
  display: block;
  margin-top: 4px;
  font-size: 12px;
  color: #B0C4E4;
}

.chapter-map {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin-bottom: 20px;
}

.chapter-map a {
  font-family: 'Roboto Mono', 'Consolas', monospace;
  font-size: 12px;
  color: #B0C4E4;
  text-decoration: none;
  border: 1px solid #1C3A6E;
  border-radius: 999px;
  padding: 6px 12px;
  transition: color 0.3s ease, border-color 0.3s ease, box-shadow 0.3s ease;
}

.chapter-map a:hover,
.chapter-map a:focus {
  color: #39FF14;
  border-color: rgba(57, 255, 20, 0.4);
  box-shadow: 0 0 12px rgba(57, 255, 20, 0.08);
}

.index-route {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
}

.route-label {
  font-family: 'Roboto Mono', 'Consolas', monospace;
  font-size: 11px;
  color: #FFD700;
  letter-spacing: 0.08em;
  padding: 6px 10px;
  border: 1px solid #1C3A6E;
  border-radius: 999px;
  background: rgba(255, 215, 0, 0.05);
}

.route-term {
  font-size: 12px;
  color: #B0C4E4;
  background: #0F2A4D;
  border: 1px solid #1C3A6E;
  border-radius: 999px;
  padding: 6px 12px;
  transition: border-color 0.3s ease, color 0.3s ease;
}

.route-term:hover {
  border-color: rgba(57, 255, 20, 0.4);
  color: #39FF14;
}

.about-hero-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 24px;
  border: 1px solid #1C3A6E;
  box-shadow: 0 24px 80px rgba(0, 0, 0, 0.3);
}

/* ===== 通用章节头 ===== */
.section-heading {
  display: flex;
  align-items: center;
  gap: 12px;
  margin: 0 0 32px;
}

.section-index {
  font-family: 'Roboto Mono', 'Consolas', monospace;
  font-size: 14px;
  font-weight: 700;
  color: #FFD700;
  letter-spacing: 0.08em;
}

.section-heading h2 {
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
  font-size: 28px;
  line-height: 1.2;
  color: #F0F4FF;
  margin: 0;
}

@media (min-width: 768px) {
  .section-heading h2 {
    font-size: 36px;
  }
}

/* ===== 品牌故事 ===== */
.about-story {
  padding: 56px 0 48px;
  border-bottom: 1px solid #1C3A6E;
}

@media (min-width: 768px) {
  .about-story {
    padding: 80px 0 64px;
  }
}

.story-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 32px;
}

@media (min-width: 768px) {
  .story-grid {
    grid-template-columns: 1.2fr 0.8fr;
    gap: 48px;
    align-items: start;
  }
}

.story-main p {
  font-size: 16px;
  line-height: 1.9;
  color: #B0C4E4;
  margin: 0 0 16px;
}

.story-main p:last-child {
  margin-bottom: 0;
}

.story-aside {
  display: grid;
  gap: 16px;
}

.brand-principle-card {
  background: #0F2A4D;
  border: 1px solid #1C3A6E;
  border-radius: 16px;
  padding: 20px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.brand-principle-card:hover {
  border-color: rgba(57, 255, 20, 0.35);
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.06);
}

.principle-num {
  font-family: 'Roboto Mono', 'Consolas', monospace;
  font-size: 12px;
  color: #39FF14;
}

.brand-principle-card h3 {
  font-size: 16px;
  color: #F0F4FF;
  margin: 8px 0 4px;
}

.brand-principle-card p {
  font-size: 14px;
  line-height: 1.7;
  color: #B0C4E4;
  margin: 0;
}

/* ===== 发展历程 ===== */
.about-timeline {
  padding: 56px 0 48px;
  background: #050D1A;
  border-top: 1px solid #1C3A6E;
  border-bottom: 1px solid #1C3A6E;
}

@media (min-width: 768px) {
  .about-timeline {
    padding: 80px 0 64px;
  }
}

.timeline-wrap {
  position: relative;
  overflow: hidden;
  background: #0A1F44;
  border: 1px solid #1C3A6E;
  border-radius: 20px;
  padding: 24px;
}

.timeline-bg {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  opacity: 0.12;
}

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

/* 移动端：垂直时间线 */
.timeline-item {
  position: relative;
  padding-left: 32px;
  padding-bottom: 28px;
}

.timeline-item::before {
  content: "";
  position: absolute;
  top: 20px;
  bottom: 0;
  left: 9px;
  width: 2px;
  background: #1C3A6E;
}

.timeline-item:last-child::before {
  display: none;
}

.timeline-item::after {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  background: #0F2A4D;
  border: 2px solid #39FF14;
}

.timeline-item.is-current::after {
  background: #39FF14;
  box-shadow: 0 0 16px rgba(57, 255, 20, 0.5);
}

.timeline-year {
  font-family: 'Roboto Mono', 'Consolas', monospace;
  font-size: 14px;
  font-weight: 700;
  color: #FFD700;
  letter-spacing: 0.04em;
}

.timeline-card {
  margin-top: 8px;
  background: #0F2A4D;
  border: 1px solid #1C3A6E;
  border-radius: 14px;
  padding: 16px;
  transition: border-color 0.3s ease, box-shadow 0.3s ease, transform 0.3s ease;
}

.timeline-card h3 {
  font-size: 16px;
  color: #F0F4FF;
  margin: 0 0 4px;
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
}

.timeline-card p {
  font-size: 14px;
  line-height: 1.7;
  color: #B0C4E4;
  margin: 0;
}

.timeline-item:hover .timeline-card,
.timeline-item:focus-within .timeline-card {
  border-color: rgba(57, 255, 20, 0.4);
  box-shadow: 0 0 20px rgba(57, 255, 20, 0.08);
  transform: translateY(-2px);
}

/* 桌面端：横向时间线 */
@media (min-width: 768px) {
  .timeline-list {
    display: grid;
    grid-template-columns: repeat(5, 1fr);
    gap: 16px;
  }

  .timeline-list::before {
    content: "";
    position: absolute;
    top: 9px;
    left: 24px;
    right: 24px;
    height: 2px;
    background: #1C3A6E;
  }

  .timeline-item {
    padding-left: 0;
    padding-bottom: 0;
    padding-top: 36px;
    display: flex;
    flex-direction: column;
  }

  .timeline-item::before {
    display: none;
  }

  .timeline-item::after {
    top: 0;
    left: 50%;
    transform: translateX(-50%);
  }

  .timeline-item.is-current::after {
    background: #39FF14;
    box-shadow: 0 0 16px rgba(57, 255, 20, 0.6);
  }

  .timeline-card {
    flex: 1;
  }
}

/* ===== 资质与认证 ===== */
.about-certification {
  padding: 56px 0 48px;
  border-bottom: 1px solid #1C3A6E;
}

@media (min-width: 768px) {
  .about-certification {
    padding: 80px 0 64px;
  }
}

.cert-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 20px;
}

@media (min-width: 768px) {
  .cert-grid {
    grid-template-columns: repeat(3, 1fr);
    gap: 24px;
  }
}

.cert-card {
  background: #0F2A4D;
  border: 1px solid #1C3A6E;
  border-radius: 20px;
  padding: 32px 24px 28px;
  text-align: center;
  transition: border-color 0.3s ease, box-shadow 0.3s ease;
}

.cert-card:hover {
  border-color: rgba(255, 215, 0, 0.35);
  box-shadow: 0 0 24px rgba(255, 215, 0, 0.05);
}

.cert-badge {
  position: relative;
  width: 180px;
  height: 180px;
  margin: 0 auto 24px;
  perspective: 800px;
  cursor: pointer;
  outline: none;
  transform-style: preserve-3d;
}

.cert-front,
.cert-back {
  position: absolute;
  inset: 0;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  gap: 6px;
  border-radius: 50%;
  border: 1px solid rgba(255, 215, 0, 0.5);
  background: linear-gradient(145deg, rgba(255, 215, 0, 0.1), rgba(255, 215, 0, 0.02));
  backface-visibility: hidden;
  -webkit-backface-visibility: hidden;
  transition: transform 0.6s ease;
}

.cert-back {
  transform: rotateY(180deg);
  background: linear-gradient(145deg, rgba(57, 255, 20, 0.1), rgba(57, 255, 20, 0.02));
  border-color: rgba(57, 255, 20, 0.5);
}

.cert-badge:hover .cert-front,
.cert-badge:focus .cert-front {
  transform: rotateY(180deg);
}

.cert-badge:hover .cert-back,
.cert-badge:focus .cert-back {
  transform: rotateY(360deg);
}

.cert-front svg {
  display: block;
  width: 44px;
  height: 44px;
}

.cert-short {
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
  font-size: 14px;
  color: #F0F4FF;
}

.cert-hint {
  font-size: 11px;
  color: #B0C4E4;
}

.cert-back strong {
  font-size: 16px;
  color: #39FF14;
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
}

.cert-back p {
  font-size: 12px;
  line-height: 1.6;
  color: #B0C4E4;
  margin: 0;
  padding: 0 20px;
}

.icp-mark {
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
  font-size: 20px;
  color: #FFD700;
}

.cert-badge.cert-icp .cert-short {
  font-size: 12px;
  line-height: 1.3;
}

.cert-card h3 {
  font-size: 16px;
  color: #F0F4FF;
  margin: 0 0 8px;
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
}

.cert-card > p {
  font-size: 14px;
  line-height: 1.7;
  color: #B0C4E4;
  margin: 0;
}

/* ===== 技术实力 ===== */
.about-tech {
  position: relative;
  overflow: hidden;
  padding: 56px 0 48px;
  background: #050D1A;
  border-top: 1px solid #1C3A6E;
  border-bottom: 1px solid #1C3A6E;
}

@media (min-width: 768px) {
  .about-tech {
    padding: 80px 0 64px;
  }
}

.about-tech::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  height: 1px;
  background: linear-gradient(90deg, transparent, #39FF14, transparent);
  opacity: 0.4;
}

.tech-grid {
  display: grid;
  grid-template-columns: 1fr;
  gap: 40px;
}

@media (min-width: 768px) {
  .tech-grid {
    grid-template-columns: minmax(0, 1fr) minmax(0, 0.9fr);
    gap: 56px;
    align-items: center;
  }
}

.tech-copy h3 {
  position: relative;
  padding-left: 24px;
  font-size: 20px;
  line-height: 1.4;
  color: #F0F4FF;
  margin: 0 0 10px;
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
}

.tech-copy h3::before {
  content: "";
  position: absolute;
  left: 0;
  top: 0.55em;
  width: 8px;
  height: 8px;
  background: #39FF14;
  border-radius: 50%;
}

.tech-copy h3 + p {
  margin-top: 0;
}

.tech-copy p {
  font-size: 14px;
  line-height: 1.8;
  color: #B0C4E4;
  margin: 0 0 20px;
}

.tech-copy .btn {
  margin-top: 16px;
}

.tech-visual img {
  display: block;
  width: 100%;
  height: auto;
  border-radius: 20px;
  border: 1px solid #1C3A6E;
  box-shadow: 0 20px 60px rgba(0, 0, 0, 0.3);
}

/* ===== 延伸入口 ===== */
.about-next {
  padding: 56px 0 48px;
}

@media (min-width: 768px) {
  .about-next {
    padding: 80px 0 64px;
  }
}

.next-panel {
  display: grid;
  grid-template-columns: 1fr;
  gap: 24px;
  background: linear-gradient(145deg, #0F2A4D, #0A1F44);
  border: 1px solid #1C3A6E;
  border-radius: 20px;
  padding: 32px;
}

@media (min-width: 768px) {
  .next-panel {
    grid-template-columns: 1fr auto;
    align-items: center;
    gap: 32px;
    padding: 40px;
  }
}

.next-copy h2 {
  font-family: 'Arial Black', 'SimHei', 'Microsoft YaHei', sans-serif;
  font-size: 24px;
  line-height: 1.3;
  color: #F0F4FF;
  margin: 0 0 8px;
}

.next-copy p {
  font-size: 14px;
  line-height: 1.7;
  color: #B0C4E4;
  margin: 0;
}

.next-links {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
}

@media (min-width: 768px) {
  .next-links {
    justify-content: flex-end;
  }
}