/* ===== about.css ===== */
/* 关于我们 & 联系我们 公用基础样式 */

*, *::before, *::after { box-sizing: border-box; }

html, body {
  margin: 0;
  padding: 0;
  font-family: 'Noto Sans SC', 'PingFang SC', 'Microsoft YaHei', sans-serif;
  background: #f8f9fa;
  color: #1f2937;
}

/* ===== HEADER（白色款）===== */
.site-header {
  position: sticky;
  top: 0;
  z-index: 200;
  background: #fff;
  box-shadow: 0 1px 3px rgba(0,0,0,0.08);
}

.header-inner {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  align-items: center;
  gap: 24px;
  height: 80px;
}

.logo-wrap {
  display: flex;
  align-items: center;
  gap: 12px;
  text-decoration: none;
  flex-shrink: 0;
}

.logo-bg {
  width: 48px;
  height: 48px;
  background: #002b5c;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.logo-icon { width: 32px; height: 32px; object-fit: contain; }

.logo-text { display: flex; flex-direction: column; }

.site-name { font-size: 18px; font-weight: 700; color: #002b5c; line-height: 1.3; }
.site-slogan { font-size: 11px; color: rgba(0,0,0,0.5); }

.main-nav {
  display: flex;
  gap: 4px;
  margin-left: auto;
}

.nav-link {
  padding: 6px 14px;
  color: #374151;
  text-decoration: none;
  font-size: 15px;
  font-weight: 500;
  border-bottom: 2px solid transparent;
  transition: all 0.2s;
}

.nav-link:hover { color: #002b5c; }

.nav-link.active {
  color: #002b5c;
  border-bottom-color: #002b5c;
  font-weight: 700;
}

.btn-login {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 7px 16px;
  background: #002b5c;
  color: #fff;
  text-decoration: none;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  white-space: nowrap;
  transition: background 0.2s;
}

.btn-login:hover { background: #004080; }
.login-icon { width: 16px; height: 16px; }

.mobile-menu-btn {
  display: none;
  flex-direction: column;
  gap: 5px;
  background: none;
  border: none;
  cursor: pointer;
  padding: 4px;
}

.mobile-menu-btn span {
  display: block;
  width: 24px;
  height: 2px;
  background: #374151;
  border-radius: 2px;
}

.mobile-nav {
  display: none;
  flex-direction: column;
  background: #fff;
  border-top: 1px solid #e5e7eb;
}

.mobile-nav.open { display: flex; }
.mobile-nav-link { padding: 12px 24px; color: #374151; text-decoration: none; font-size: 15px; border-bottom: 1px solid #f3f4f6; }

/* ===== 二级导航 ===== */
.sub-nav-bar {
  background: #f3f4f5;
  border-bottom: 1px solid #c4c6d0;
}

.sub-nav-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  gap: 32px;
  align-items: center;
  height: 48px;
}

.sub-nav-link {
  font-size: 16px;
  color: #43474f;
  text-decoration: none;
  transition: color 0.2s;
  white-space: nowrap;
  padding-bottom: 4px;
  border-bottom: 2px solid transparent;
}

.sub-nav-link:hover { color: #001736; }

.sub-nav-link.active {
  font-weight: 700;
  color: #001736;
  border-bottom-color: #fea619;
}

/* ===== HERO BANNER ===== */
.about-hero {
  position: relative;
  height: 600px;
  overflow: hidden;
}

.hero-bg-img {
  position: absolute;
  inset: 0;
  z-index: 0;
}

.hero-bg-img img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.hero-overlay {
  position: absolute;
  inset: 0;
  background: linear-gradient(90deg, rgba(0,23,54,0.85) 0%, rgba(0,23,54,0.3) 60%, transparent 100%);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1;
}

.hero-content {
  max-width: 1500px;
  width: 100%;
  padding: 0 40px 0 160px;
  margin: 0 auto;
  display: flex;
  flex-direction: column;
  gap: 20px;
  box-sizing: border-box;
}

.hero-subtitle {
  font-size: 16px;
  font-weight: 700;
  color: #fea619;
  letter-spacing: 1.6px;
  text-transform: uppercase;
}

.hero-title {
  font-size: 80px;
  font-weight: 900;
  color: #fff;
  margin: 0;
  line-height: 1.1;
  letter-spacing: -1.6px;
}

.hero-desc {
  font-size: 22px;
  font-weight: 300;
  color: #e1e3e4;
  margin: 0;
  line-height: 1.7;
}

/* ===== 数据统计 ===== */
.about-stats {
  background: #fff;
  border-bottom: 1px solid #c4c6d0;
  padding: 48px 0;
}

.stats-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 0;
}

.stat-item {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 0 16px;
}

.stat-border {
  border-left: 1px solid #c4c6d0;
}

.stat-label {
  font-size: 16px;
  color: #43474f;
  text-align: center;
}

.stat-num {
  font-size: 56px;
  font-weight: 900;
  color: #001736;
  line-height: 1;
}

/* ===== 品牌概览 ===== */
.about-brand {
  background: #f8f9fa;
  padding: 96px 0;
}

.brand-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 64px;
  align-items: start;
}

.brand-heading {
  display: flex;
  align-items: center;
  gap: 16px;
  margin-bottom: 32px;
}

.brand-bar {
  width: 8px;
  height: 40px;
  background: #fea619;
  flex-shrink: 0;
}

.brand-heading h2 {
  font-size: 36px;
  font-weight: 700;
  color: #001736;
  margin: 0;
}

.brand-paras {
  display: flex;
  flex-direction: column;
  gap: 16px;
}

.brand-paras p {
  font-size: 17px;
  color: #43474f;
  line-height: 2;
  margin: 0;
}

/* 视频卡片 */
.brand-video {
  background: #edeeef;
  border-radius: 12px;
  overflow: hidden;
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1), 0 4px 6px -4px rgba(0,0,0,0.1);
  position: relative;
  aspect-ratio: 16 / 10;
  display: flex;
  flex-direction: column;
  justify-content: flex-end;
}

.brand-video-cover {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
  z-index: 0;
  display: block;
}

.video-overlay {
  position: absolute;
  inset: 0;
  z-index: 1;
  background: rgba(0,23,54,0.2);
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
}

.video-play-btn {
  width: 96px;
  height: 96px;
  background: rgba(255,255,255,0.88);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  backdrop-filter: blur(2px);
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
  transition: transform 0.2s;
}

.video-play-btn:hover { transform: scale(1.08); }

.video-play-btn img {
  width: 28px;
  height: 35px;
  object-fit: contain;
}

.video-caption {
  position: relative;
  z-index: 2;
  padding: 20px;
  background: linear-gradient(to top, rgba(0,23,54,0.8) 0%, transparent 100%);
}

.video-title {
  font-size: 16px;
  color: #fff;
  margin: 0 0 4px;
}

.video-hint {
  font-size: 14px;
  color: #e1e3e4;
  margin: 0;
}

/* ===== 发展历程 ===== */
.about-timeline {
  background: #fff;
  padding: 96px 0;
}

.timeline-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
}

.section-title-center {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 16px;
  margin-bottom: 64px;
}

.section-title-center h2 {
  font-size: 48px;
  font-weight: 700;
  color: #001736;
  margin: 0;
  text-align: center;
}

.title-bar {
  width: 80px;
  height: 4px;
  background: #fea619;
  border-radius: 2px;
}

.timeline-wrapper {
  position: relative;
}

.timeline-line {
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 2px;
  background: #c4c6d0;
  transform: translateY(-50%);
}

.timeline-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 32px;
  position: relative;
}

.milestone {
  background: #f8f9fa;
  border-top: 4px solid #fea619;
  border-radius: 8px;
  padding: 36px 32px 32px;
  display: flex;
  flex-direction: column;
  gap: 8px;
  position: relative;
}

.ms-year {
  font-size: 36px;
  font-weight: 900;
  color: #fea619;
  line-height: 1.1;
}

.ms-title {
  font-size: 22px;
  font-weight: 700;
  color: #001736;
  margin: 8px 0 0;
  line-height: 1.4;
}

.ms-desc {
  font-size: 15px;
  color: #43474f;
  line-height: 1.6;
  margin: 0;
}

.ms-dot {
  position: absolute;
  bottom: -28px;
  left: 50%;
  transform: translateX(-50%);
  width: 16px;
  height: 16px;
  background: #fea619;
  border: 4px solid #fff;
  border-radius: 4px;
}

/* ===== 荣誉资质 ===== */
.about-honors {
  background: linear-gradient(135deg, #0f172a 0%, #1e293b 50%, #0f172a 100%);
  padding: 96px 0;
}

.honors-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 40px;
}

.honors-titles {
  text-align: center;
}

.honors-titles h2 {
  font-size: 48px;
  font-weight: 700;
  color: #fff;
  margin: 0 0 8px;
  letter-spacing: -1.2px;
}

.honors-en {
  font-size: 18px;
  font-weight: 700;
  color: #fea619;
  letter-spacing: 6px;
  text-transform: uppercase;
  margin: 0;
  opacity: 0.85;
}

.honors-carousel-wrap {
  display: flex;
  align-items: center;
  gap: 32px;
  width: 100%;
  justify-content: center;
}

.honors-arrow {
  width: 48px;
  height: 48px;
  background: rgba(255,255,255,0.05);
  border: 1px solid rgba(96,165,250,0.3);
  border-radius: 12px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: background 0.2s;
  flex-shrink: 0;
}

.honors-arrow:hover { background: rgba(255,255,255,0.15); }

.honors-arrow img { width: 10px; height: 15px; object-fit: contain; filter: brightness(0) invert(1); }

.honors-display {
  background: #fff;
  padding: 8px;
  box-shadow: 0 25px 50px -12px rgba(0,0,0,0.25);
  max-width: 720px;
  width: 100%;
}

.honors-cert-img {
  padding: 24px;
  background: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
}

.honors-cert-img img {
  max-width: 420px;
  width: 100%;
  height: auto;
  box-shadow: 0 10px 15px -3px rgba(0,0,0,0.1);
}

.honors-cert-label {
  text-align: center;
  padding: 14px 0;
  border-top: 1px solid #f3f4f6;
  font-size: 15px;
  font-weight: 700;
  color: #4b5563;
  letter-spacing: 0.8px;
}

.honors-dots {
  display: flex;
  gap: 8px;
  align-items: center;
}

.h-dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background: rgba(255,255,255,0.3);
  cursor: pointer;
  transition: background 0.2s;
}

.h-dot.active { background: #3b82f6; }
.h-dot:hover { background: rgba(255,255,255,0.6); }

/* ===== 企业文化 ===== */
.about-culture {
  background: #f8f9fa;
  padding: 96px 0;
}

.culture-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
}

.culture-grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 32px;
}

.culture-card {
  background: #fff;
  border-left: 4px solid #001736;
  border-radius: 8px;
  padding: 32px 32px 32px 36px;
  box-shadow: 0 1px 2px rgba(0,0,0,0.05);
  display: flex;
  flex-direction: column;
  gap: 16px;
  transition: box-shadow 0.2s;
}

.culture-card:hover { box-shadow: 0 4px 12px rgba(0,0,0,0.1); }

.culture-icon {
  width: 48px;
  height: 48px;
  background: rgba(0,43,92,0.1);
  border-radius: 4px;
  display: flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
}

.culture-icon img {
  display: block;
  width: auto;
  height: auto;
  max-width: 24px;
  max-height: 24px;
  object-fit: contain;
}

.culture-card h3 {
  font-size: 22px;
  font-weight: 700;
  color: #001736;
  margin: 0;
  padding-top: 8px;
}

.culture-card p {
  font-size: 15px;
  color: #43474f;
  line-height: 1.7;
  margin: 0;
}

/* ===== FOOTER ===== */
.site-footer {
  background: #002b5c;
  color: #fff;
  padding: 40px 0 0;
}

.footer-container {
  max-width: 1500px;
  margin: 0 auto;
  padding: 0 24px;
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.5fr 1fr 1fr;
  gap: 40px;
  padding-bottom: 32px;
  border-bottom: 1px solid rgba(255,255,255,0.1);
}

.footer-brand { font-size: 18px; font-weight: 700; margin: 0 0 12px; }
.footer-desc { font-size: 13px; color: rgba(255,255,255,0.6); line-height: 1.7; margin: 0 0 16px; }

.footer-socials { display: flex; gap: 10px; }

.footer-social-link {
  width: 32px;
  height: 32px;
  background: rgba(255,255,255,0.12);
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: background 0.2s;
}

.footer-social-link:hover { background: rgba(255,255,255,0.25); }
.footer-social-link img { width: 16px; height: 16px; filter: brightness(0) invert(1); }

.footer-col-title { font-size: 15px; font-weight: 600; margin: 0 0 16px; }

.footer-links-grid {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: 8px 16px;
}

.footer-link { font-size: 13px; color: rgba(255,255,255,0.65); text-decoration: none; transition: color 0.2s; }
.footer-link:hover { color: #fea619; }

.footer-contact-list { list-style: none; margin: 0; padding: 0; display: flex; flex-direction: column; gap: 10px; }
.footer-contact-list li { display: flex; align-items: center; gap: 8px; font-size: 13px; color: rgba(255,255,255,0.65); }
.footer-contact-list li img { width: 14px; height: 14px; filter: brightness(0) invert(0.6); flex-shrink: 0; }

.footer-bottom { text-align: center; padding: 16px 0; }
.footer-bottom p { font-size: 12px; color: rgba(255,255,255,0.4); margin: 0; }

/* ===== 响应式 ===== */
@media (max-width: 1024px) {
  .main-nav { display: none; }
  .mobile-menu-btn { display: flex; margin-left: auto; }
  .hero-title { font-size: 56px; }
  .hero-content { padding-left: 80px; }
  .stat-num { font-size: 40px; }
  .brand-container { grid-template-columns: 1fr; gap: 40px; }
  .timeline-line { display: none; }
  .timeline-grid { grid-template-columns: repeat(2, 1fr); }
  .culture-grid { grid-template-columns: repeat(2, 1fr); }
}

@media (max-width: 768px) {
  .sub-nav-container { gap: 16px; overflow-x: auto; }
  .sub-nav-link { font-size: 14px; }
  .about-hero { height: 400px; }
  .hero-content { padding: 0 24px; }
  .hero-title { font-size: 40px; }
  .hero-desc { font-size: 16px; }
  .stats-container { grid-template-columns: repeat(2, 1fr); }
  .stat-border:nth-child(3) { border-left: none; border-top: 1px solid #c4c6d0; }
  .timeline-grid { grid-template-columns: 1fr; }
  .culture-grid { grid-template-columns: 1fr; }
  .honors-carousel-wrap { flex-direction: column; }
  .honors-arrow { display: none; }
  .footer-grid { grid-template-columns: 1fr; gap: 24px; }
}

@media (max-width: 480px) {
  .hero-title { font-size: 26px; line-height: 1.3; }
  .hero-desc { font-size: 14px; }
  .about-hero { height: 280px; }
  .stats-container { grid-template-columns: 1fr 1fr; }
  .stat-num { font-size: 32px; }
  .about-brand, .about-timeline, .about-honors, .about-culture { padding: 40px 0; }
  .section-title-center h2 { font-size: 26px; }
  .brand-container { padding: 0 16px; }
  .timeline-grid { gap: 24px; }
  .culture-grid { gap: 16px; }
  .culture-card { padding: 20px 16px; }
  .culture-card h3 { font-size: 18px; }
  .sub-nav-bar { overflow-x: auto; -webkit-overflow-scrolling: touch; }
  .sub-nav-container { gap: 8px; padding: 0 16px; white-space: nowrap; }
  .sub-nav-link { font-size: 13px; padding: 8px 12px; }
  .footer-grid { gap: 20px; }
}

.about-video-modal {
  position: fixed;
  inset: 0;
  z-index: 9999;
  background: rgba(0, 0, 0, 0.75);
  display: flex;
  align-items: center;
  justify-content: center;
  padding: 24px;
}

.about-video-modal-inner {
  position: relative;
  max-width: 960px;
  width: 100%;
  background: #000;
  border-radius: 8px;
  overflow: hidden;
}

.about-video-modal-inner video {
  display: block;
  width: 100%;
  max-height: 80vh;
}

.about-video-close {
  position: absolute;
  top: 8px;
  right: 12px;
  z-index: 2;
  border: none;
  background: rgba(0, 0, 0, 0.5);
  color: #fff;
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 24px;
  line-height: 1;
  cursor: pointer;
}

.about-qrcode-modal {
  background: #fff;
  padding: 24px;
  text-align: center;
  max-width: 320px;
}

.about-qrcode-modal img {
  display: block;
  width: 220px;
  max-width: 100%;
  margin: 0 auto 12px;
}

.about-qrcode-tip {
  margin: 0;
  font-size: 14px;
  color: #4b5563;
}