:root {
  --primary-navy: #0e2038;
  --secondary-navy: #0b1a2e;
  --accent-gold: #c89a3f;
  --accent-gold-hover: #b08532;
  --text-dark: #1e293b;
  --text-gray: #4b5563;
  --text-light-gray: #64748b;
  --bg-light: #f8fafc;
  --border-color: #e2e8f0;
  --white: #ffffff;
}

* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}

body {
  font-family: 'Montserrat', 'Noto Sans SC', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
  color: var(--text-dark);
  background-color: #ffffff;
  line-height: 1.6;
  overflow-x: hidden;
}

/* 全局容器定义 */
.container {
  max-width: 1360px;
  margin: 0 auto;
  padding: 0 24px;
}

/* 顶部顶通 Top Bar */
.top-bar {
  background-color: var(--secondary-navy);
  color: #cbd5e1;
  font-size: 12.5px;
  padding: 7px 0;
  border-bottom: 1px solid rgba(255, 255, 255, 0.08);
}

.top-bar-content {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.top-left-info {
  display: flex;
  align-items: center;
  gap: 28px;
}

.top-left-info a {
  color: #cbd5e1;
  text-decoration: none;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: color 0.2s;
}

.top-left-info a:hover {
  color: var(--accent-gold);
}

.top-right-social {
  display: flex;
  align-items: center;
  gap: 16px;
}

.top-right-social span {
  color: #94a3b8;
  font-weight: 500;
}

.social-icons {
  display: flex;
  gap: 12px;
}

.social-icons a {
  color: #cbd5e1;
  text-decoration: none;
  font-size: 13px;
  transition: color 0.2s;
}

.social-icons a:hover {
  color: var(--accent-gold);
}

/* 主导航栏 Header Navigation */
header {
  background-color: var(--white);
  box-shadow: 0 2px 10px rgba(0, 0, 0, 0.04);
  position: sticky;
  top: 0;
  z-index: 100;
}

.nav-container {
  display: flex;
  justify-content: space-between;
  align-items: center;
  height: 84px;
}

.logo-wrapper {
  display: flex;
  align-items: center;
}

.logo-wrapper img {
  width: 300px;
  height: auto;
  max-height: 70px;
  object-fit: contain;
}

nav {
  display: flex;
  align-items: center;
  gap: 32px;
}

.nav-links {
  display: flex;
  list-style: none;
  align-items: center;
  gap: 24px;
}

.nav-item {
  position: relative;
}

.nav-links a {
  text-decoration: none;
  color: #334155;
  font-size: 14.5px;
  font-weight: 600;
  transition: color 0.2s;
  position: relative;
  padding: 8px 0;
  display: flex;
  align-items: center;
  gap: 4px;
}

.nav-links a:hover,
.nav-links a.active {
  color: var(--accent-gold);
}

.nav-links a.active::after {
  content: '';
  position: absolute;
  bottom: 0;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--accent-gold);
  border-radius: 2px;
}

.nav-links .dropdown-icon {
  font-size: 11px;
  margin-left: 2px;
  transition: transform 0.2s;
}

/* Solutions 下拉菜单 */
.nav-dropdown {
  position: absolute;
  top: calc(100% + 4px);
  left: 0;
  background-color: var(--white);
  min-width: 280px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.12), 0 8px 10px -6px rgba(0, 0, 0, 0.08);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  opacity: 0;
  visibility: hidden;
  transform: translateY(8px);
  transition: all 0.2s ease;
  list-style: none;
  z-index: 1000;
}

.nav-item:hover .nav-dropdown {
  opacity: 1;
  visibility: visible;
  transform: translateY(0);
}

.nav-item:hover .dropdown-icon {
  transform: rotate(180deg);
}

.nav-dropdown li a {
  padding: 10px 18px;
  font-size: 13.5px;
  font-weight: 500;
  color: var(--text-dark);
  border-bottom: 1px solid #f1f5f9;
  display: block;
}

.nav-dropdown li:last-child a {
  border-bottom: none;
}

.nav-dropdown li a:hover {
  background-color: #f8fafc;
  color: var(--accent-gold);
  padding-left: 22px;
}

/* 语言切换器下拉组件 */
.lang-switcher-wrap {
  position: relative;
}

.lang-btn {
  background-color: var(--primary-navy);
  color: var(--white);
  border: 1px solid rgba(255, 255, 255, 0.15);
  border-radius: 6px;
  padding: 7px 14px;
  font-size: 13.5px;
  font-weight: 600;
  cursor: pointer;
  display: flex;
  align-items: center;
  gap: 8px;
  transition: all 0.25s ease;
  font-family: inherit;
}

.lang-btn:hover {
  background-color: #172e4f;
}

.lang-dropdown-menu {
  display: none;
  position: absolute;
  right: 0;
  top: calc(100% + 6px);
  background-color: var(--white);
  min-width: 140px;
  box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.15), 0 8px 10px -6px rgba(0, 0, 0, 0.1);
  border-radius: 8px;
  overflow: hidden;
  border: 1px solid var(--border-color);
  z-index: 1000;
}

.lang-dropdown-menu.show {
  display: block;
  animation: fadeInDown 0.2s ease;
}

@keyframes fadeInDown {
  from { opacity: 0; transform: translateY(-8px); }
  to { opacity: 1; transform: translateY(0); }
}

.lang-dropdown-menu button {
  width: 100%;
  text-align: left;
  padding: 10px 16px;
  background: none;
  border: none;
  color: var(--text-dark);
  font-size: 13.5px;
  font-weight: 500;
  cursor: pointer;
  display: flex;
  align-items: center;
  justify-content: space-between;
  transition: background-color 0.15s;
  font-family: inherit;
}

.lang-dropdown-menu button:hover {
  background-color: #f1f5f9;
  color: var(--accent-gold);
}

.lang-dropdown-menu button.active-lang {
  color: var(--accent-gold);
  font-weight: 700;
  background-color: #f8fafc;
}

/* 通用按钮样式 Buttons */
.btn-gold {
  background-color: var(--accent-gold);
  color: var(--white);
  padding: 13px 26px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  transition: all 0.25s ease;
  border: 1px solid var(--accent-gold);
}

.btn-gold:hover {
  background-color: var(--accent-gold-hover);
  border-color: var(--accent-gold-hover);
  transform: translateY(-1px);
}

.btn-outline-navy {
  background-color: rgba(14, 32, 56, 0.7);
  color: var(--white);
  padding: 13px 26px;
  border-radius: 4px;
  font-size: 14px;
  font-weight: 600;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  gap: 10px;
  border: 1px solid rgba(255, 255, 255, 0.25);
  transition: all 0.25s ease;
  backdrop-filter: blur(4px);
}

.btn-outline-navy:hover {
  background-color: rgba(255, 255, 255, 0.15);
  border-color: rgba(255, 255, 255, 0.6);
  transform: translateY(-1px);
}

/* 通用 Section 头部规范 */
.section-header-center {
  text-align: center;
  max-width: 760px;
  margin: 0 auto 50px;
}

.section-label {
  display: inline-flex;
  align-items: center;
  gap: 8px;
  font-size: 13px;
  font-weight: 700;
  letter-spacing: 1.5px;
  color: var(--accent-gold);
  text-transform: uppercase;
  margin-bottom: 12px;
}

.section-label::before {
  content: '';
  display: inline-block;
  width: 24px;
  height: 2px;
  background-color: var(--accent-gold);
}

.section-label.center::before {
  display: none;
}

.section-heading {
  font-size: 34px;
  font-weight: 800;
  color: var(--primary-navy);
  margin-bottom: 16px;
  letter-spacing: -0.5px;
}

.section-subtext {
  font-size: 15px;
  color: var(--text-gray);
  line-height: 1.65;
}

/* 子页面统一通栏 Header Banner */
.page-banner {
  background: linear-gradient(135deg, rgba(9, 20, 38, 0.95) 0%, rgba(14, 32, 56, 0.85) 100%),
              url('https://images.unsplash.com/photo-1486406146926-c627a92ad1ab?q=80&w=2000&auto=format&fit=crop') center/cover no-repeat;
  color: var(--white);
  padding: 70px 0;
  text-align: center;
}

.page-banner-content {
  max-width: 860px;
  margin: 0 auto;
}

.page-banner-tag {
  display: inline-block;
  letter-spacing: 2px;
  font-size: 12px;
  font-weight: 700;
  color: #ffd978;
  text-transform: uppercase;
  margin-bottom: 14px;
}

.page-banner-title {
  font-size: 38px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 18px;
  letter-spacing: -0.5px;
}

.page-banner-desc {
  font-size: 16px;
  color: #cbd5e1;
  line-height: 1.7;
}

/* 公共组件：公司简介与愿景/使命 (About Us & Vision/Mission 卡片，首页与关于我们共用) */
.about-section {
  padding: 85px 0;
  background-color: #ffffff;
}

.about-grid {
  display: grid;
  grid-template-columns: 1.18fr 0.82fr;
  gap: 65px;
  align-items: start;
}

.about-main-text p {
  font-size: 14.5px;
  line-height: 1.75;
  color: var(--text-gray);
  margin-bottom: 18px;
}

.about-main-text p.highlight-p {
  font-weight: 600;
  color: #1e293b;
}

.cards-stack {
  display: flex;
  flex-direction: column;
  gap: 24px;
}

.vm-card {
  background-color: #ffffff;
  border: 1px solid var(--border-color);
  border-radius: 12px;
  padding: 26px;
  display: flex;
  gap: 20px;
  box-shadow: 0 4px 16px rgba(0, 0, 0, 0.03);
  transition: all 0.25s ease;
}

.vm-card:hover {
  box-shadow: 0 10px 25px rgba(0, 0, 0, 0.07);
  border-color: #cbd5e1;
  transform: translateY(-2px);
}

.vm-icon-box {
  width: 54px;
  height: 54px;
  border-radius: 50%;
  background-color: var(--primary-navy);
  color: var(--white);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 22px;
  flex-shrink: 0;
}

.vm-content h3 {
  font-size: 17px;
  font-weight: 700;
  color: var(--primary-navy);
  margin-bottom: 8px;
}

.vm-content p {
  font-size: 13.5px;
  line-height: 1.65;
  color: var(--text-gray);
}

/* 公共组件：统计数据指标矩阵 (Stats Grid，多页面复用) */
.stats-section {
  padding: 70px 0;
  background-color: var(--primary-navy);
  color: var(--white);
}

.stats-grid {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 30px;
  text-align: center;
}

.stat-item {
  padding: 20px 10px;
}

.stat-num {
  font-size: 42px;
  font-weight: 800;
  color: #ffd978;
  margin-bottom: 8px;
  line-height: 1;
}

.stat-label {
  font-size: 14px;
  color: #cbd5e1;
  font-weight: 500;
}

/* 通用结尾行动呼吁 Closing CTA */
.closing-cta-section {
  padding: 85px 0;
  background: linear-gradient(135deg, #0e2038 0%, #152d4e 100%);
  color: var(--white);
  text-align: center;
  position: relative;
}

.cta-content {
  max-width: 820px;
  margin: 0 auto;
}

.cta-title {
  font-size: 34px;
  font-weight: 800;
  line-height: 1.25;
  margin-bottom: 20px;
  letter-spacing: -0.5px;
}

.cta-desc {
  font-size: 15.5px;
  color: #cbd5e1;
  line-height: 1.7;
  margin-bottom: 34px;
}

/* 通用页脚 Footer */
footer {
  background-color: var(--secondary-navy);
  color: #94a3b8;
  padding: 70px 0 30px;
  font-size: 13.5px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
}

.footer-grid {
  display: grid;
  grid-template-columns: 1.4fr 0.8fr 1fr 1fr;
  gap: 40px;
  margin-bottom: 50px;
}

.footer-col-about img {
  width: 240px;
  height: auto;
  margin-bottom: 18px;
  filter: brightness(0) invert(1);
}

.footer-col-about p {
  line-height: 1.7;
  color: #94a3b8;
}

.footer-col h4 {
  color: var(--white);
  font-size: 15px;
  font-weight: 700;
  margin-bottom: 20px;
  position: relative;
}

.footer-links {
  list-style: none;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.footer-links a {
  color: #94a3b8;
  text-decoration: none;
  transition: color 0.2s ease;
}

.footer-links a:hover {
  color: var(--accent-gold);
  padding-left: 4px;
}

.footer-contact-info {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.footer-contact-item {
  display: flex;
  align-items: flex-start;
  gap: 10px;
  color: #94a3b8;
}

.footer-contact-item i {
  color: var(--accent-gold);
  margin-top: 4px;
}

.footer-bottom {
  padding-top: 25px;
  border-top: 1px solid rgba(255, 255, 255, 0.08);
  text-align: center;
  font-size: 12.5px;
}

/* 全局基础响应式规范 */
@media (max-width: 1200px) {
  .footer-grid {
    grid-template-columns: 1fr 1fr;
  }
  .stats-grid {
    grid-template-columns: repeat(2, 1fr);
  }
}

@media (max-width: 1024px) {
  .about-grid {
    grid-template-columns: 1fr;
    gap: 40px;
  }
}

@media (max-width: 768px) {
  .top-bar-content {
    flex-direction: column;
    gap: 6px;
    text-align: center;
  }
  .nav-links {
    display: none;
  }
  .footer-grid {
    grid-template-columns: 1fr;
  }
  .logo-wrapper img {
    width: 220px;
  }
  .stats-grid {
    grid-template-columns: 1fr;
  }
}