:root {
  --primary: #0F52BA;      /* 主蓝 */
  --primary-dark: #0A3D8C; /* 深蓝 */
  --primary-light: #4A90E2; /* 亮蓝 (悬停/点缀) */
  --bg-light: #F8FAFC;     /* 页面背景 */
  --text-dark: #2D3748;    /* 正文 */
  --text-light: #718096;   /* 浅色辅助文 */
  --white: #FFFFFF;
  --shadow: rgba(10, 61, 140, 0.08);
  --shadow-hover: rgba(10, 61, 140, 0.15);
}

/* ====== 1. 全局重置与字体 ====== */
body {
  font-family: "Helvetica Neue", "PingFang SC", "Microsoft YaHei", "Segoe UI", sans-serif !important;
  color: var(--text-dark) !important;
  line-height: 1.65 !important;
  background-color: var(--bg-light) !important;
}

.banner,
.slider,
.jumbotron,
.video-showcase,
.video-section,
.navbar,
.footer {
  color: var(--white) !important;
}

.banner a,
.video-showcase a,
.footer a,
.navbar a {
  color: var(--white) !important;
}

/* ====== 2. 导航栏 ====== */
.navbar {
  background-color: var(--primary-dark) !important;
  box-shadow: 0 4px 12px var(--shadow) !important;
  padding: 0.75rem 0 !important;
  min-height: 70px !important;
  transition: all 0.3s ease;
}

.navbar-brand {
  color: var(--white) !important;
  font-size: 1.8rem !important;
  font-weight: 700 !important;
  letter-spacing: 0.5px !important;
}

/* 导航链接基础样式 */
.navbar-nav > li > a {
  color: rgba(255, 255, 255, 0.95) !important;
  font-weight: 500 !important;
  font-size: 15px !important;
  padding: 1rem 1.25rem !important;
  margin: 0 0.25rem !important;
  border-radius: 6px !important;
  transition: all 0.25s ease !important;
}

/* 悬停状态 */
.navbar-nav > li > a:hover {
  color: var(--white) !important;
  background-color: rgba(255, 255, 255, 0.1) !important;
}

/* 当前选中状态 */
.navbar-nav > li.active > a {
  color: var(--white) !important;
  font-weight: 600 !important;
  background-color: transparent !important;
  position: relative;
}

/* 底部指示条 */
.navbar-nav > li.active > a::after {
  content: '';
  position: absolute;
  bottom: 0.5rem; 
  left: 1.25rem; 
  right: 1.25rem; 
  height: 3px;
  background-color: var(--white);
  border-radius: 3px 3px 0 0;
  animation: fadeInBar 0.3s ease;
}

@keyframes fadeInBar {
  from { opacity: 0; transform: scaleX(0); }
  to { opacity: 1; transform: scaleX(1); }
}

/* 手机端导航适配 */
@media (max-width: 992px) {
  .navbar-collapse {
    background-color: var(--primary-dark) !important;
    border-radius: 12px;
    margin-top: 1rem;
    padding: 1rem;
    box-shadow: 0 10px 30px rgba(0,0,0,0.2);
  }
  .navbar-nav > li.active > a::after {
    display: none; /* 手机端隐藏指示条 */
  }
  .navbar-nav > li.active > a {
    background-color: rgba(255, 255, 255, 0.15) !important; /* 手机端改用背景色区分 */
  }
}

/* ====== 3. Banner区域 ====== */
.banner, .slider, .jumbotron {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%) !important;
  padding: 5rem 0 !important;
  color: var(--white) !important;
  position: relative;
}

.banner h1 {
  font-size: 3rem !important;
  font-weight: 800 !important;
  color: var(--white) !important;
  text-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
  margin-bottom: 1.5rem;
}

.banner p {
  font-size: 1.25rem !important;
  color: rgba(255, 255, 255, 0.95) !important;
  max-width: 700px;
  margin: 0 auto 2.5rem;
}

/* ====== 4. 内容卡片与区块 ====== */
/* 4.1 通用卡片 */
.product-item, .item, .card {
  background: var(--white) !important;
  border-radius: 12px !important;
  border: 1px solid #E2E8F0 !important;
  box-shadow: 0 4px 16px var(--shadow) !important;
  overflow: hidden !important;
  transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1) !important;
  margin-bottom: 2rem !important;
  height: 95% !important;
  display: flex !important;
  flex-direction: column !important;
}

.product-item:hover, .card:hover {
  transform: translateY(-8px) !important;
  box-shadow: 0 16px 40px var(--shadow-hover) !important;
  border-color: var(--primary-light) !important;
}

.product-item h3,
.card-title,
.product-item p {
  color: var(--text-dark) !important;
}

/* 4.2 卡片内部结构 */
.product-item img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}

.product-item .card-body {
  padding: 1.75rem !important;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.product-item .card-body p {
  color: var(--text-light) !important;
  flex-grow: 1;
  margin-bottom: 1.5rem;
}

/* ====== 5. 按钮 ====== */
.btn, .button, .btn-primary {
  background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%) !important;
  color: var(--white) !important;
  border: none !important;
  border-radius: 8px !important;
  padding: 0.875rem 2rem !important;
  font-weight: 600 !important;
  font-size: 1rem !important;
  box-shadow: 0 4px 12px rgba(15, 82, 186, 0.25) !important;
  transition: all 0.3s ease !important;
  display: inline-flex !important;
  align-items: center !important;
  justify-content: center !important;
}

.btn:hover, .button:hover {
  transform: translateY(-3px) !important;
  box-shadow: 0 8px 20px rgba(15, 82, 186, 0.4) !important;
  background: linear-gradient(135deg, var(--primary-light) 0%, var(--primary) 100%) !important;
}

.banner .btn,
.video-showcase .btn {
  background: rgba(255, 255, 255, 0.2) !important;
  backdrop-filter: blur(10px);
  border: 1px solid rgba(255, 255, 255, 0.3) !important;
}
.banner .btn:hover,
.video-showcase .btn:hover {
  background: rgba(255, 255, 255, 0.3) !important;
}

/* ====== 6. 各内容区块通用样式 ====== */
.company-intro,
.video-showcase,
.news-section {
  padding: 5rem 0 !important;
}

/* 6.1 公司简介 */
.company-intro {
  background-color: var(--white) !important;
}
.company-intro .title {
  color: var(--primary-dark) !important;
}

/* 6.2 新闻中心 */
.news-item {
  border-left: 4px solid var(--primary-light) !important;
  padding-left: 1.5rem !important;
  margin-bottom: 1.5rem !important;
  transition: all 0.3s ease !important;
}
.news-item:hover {
  border-left-color: var(--primary) !important;
  transform: translateX(8px);
}
.news-item .title {
  color: var(--primary-dark) !important;
}

/* 6.3 视频展示 */
.video-showcase {
  background: linear-gradient(135deg, var(--primary-dark) 0%, var(--primary) 100%) !important;
  color: var(--white) !important;
}
.video-showcase .title {
  color: var(--white) !important;
}
.video-container {
  background: rgba(0, 0, 0, 0.2);
  border-radius: 16px;
  border: 1px solid rgba(255, 255, 255, 0.15);
  padding: 1.5rem;
  backdrop-filter: blur(10px);
}

/* ====== 7. 页脚 ====== */
.footer {
  background: linear-gradient(135deg, #081c4a 0%, var(--primary-dark) 100%) !important;
  color: rgba(255, 255, 255, 0.9) !important;
  padding: 4rem 0 1.5rem !important;
  margin-top: 4rem;
}

.footer a {
  color: rgba(255, 255, 255, 0.9) !important;
  transition: all 0.25s ease;
  display: inline-block;
}
.footer a:hover {
  color: var(--primary-light) !important;
  transform: translateX(5px);
}

/* ====== 8. 通用标题与工具类 ====== */
.section-title {
  color: var(--primary-dark) !important;
  font-size: 2.5rem !important;
  font-weight: 700 !important;
  margin-bottom: 1rem !important;
  text-align: center;
  position: relative;
}
.section-title::after {
  content: '';
  display: block;
  width: 80px;
  height: 4px;
  background: linear-gradient(to right, var(--primary), var(--primary-light));
  margin: 1rem auto 2.5rem;
  border-radius: 2px;
}

/* 白色背景下的深色标题 */
.bg-white .section-title,
.company-intro .section-title {
  color: var(--primary-dark) !important;
}

/* 蓝色背景下的白色标题 */
.bg-blue .section-title,
.banner .section-title,
.video-showcase .section-title {
  color: var(--white) !important;
}
.bg-blue .section-title::after,
.banner .section-title::after,
.video-showcase .section-title::after {
  background: linear-gradient(to right, rgba(255,255,255,0.6), rgba(255,255,255,1));
}