/* ===== 基础重置 ===== */
*, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
body { 
  font-family: "Microsoft YaHei", "PingFang SC", sans-serif; 
  color: #333; 
  line-height: 1.6; 
  background: #fff; /* PPT 背景是白色的 */
}
.container { max-width: 1200px; margin: 0 auto; padding: 0 20px; }
a { text-decoration: none; color: inherit; }

/* ===== 1. 顶部导航（PPT 风格亮蓝） ===== */
.site-header { 
  background-color: #0055ff; /* 提取自 PPT 顶部的亮蓝色 */
  color: #fff;
  height: 120px;
  display: flex;
  align-items: center;
  box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}
.header-inner { 
  display: flex; 
  justify-content: space-between; 
  align-items: center; 
  width: 120%; 
}
.company-name { 
  font-size: 2.0rem; 
  font-weight: bold; 
  letter-spacing: 1px; 
}
.main-nav a { 
  color: rgba(255,255,255,0.9); 
  margin-left: 30px; 
  font-size: 1.2rem; 
  transition: color 0.3s;
}
.main-nav a:hover, .main-nav a.active { 
  color: #fff; 
  font-weight: bold; 
  text-decoration: underline;
}
.menu-toggle { display: none; background: none; border: none; color: #fff; font-size: 1.5rem; cursor: pointer; }

/* ===== 2. 横向滚动 Banner（PPT 中间动图条） ===== */
.banner-scroll-section {
  background: #f0f4f8;
  padding: 20px 0;
  overflow: hidden; /* 隐藏超出部分 */
  white-space: nowrap;
  border-bottom: 1px solid #ddd;
}
.scroll-track {
  display: inline-block;
  animation: scrollLeft 20s linear infinite; /* 20秒滚完一圈，可调整速度 */
}
.scroll-item {
  display: inline-block;
  width: 220px; /* 根据图片比例调整宽度 */
  margin: 0 10px;
  vertical-align: middle;
}
.scroll-item img {
  width: 100%;
  height: auto;
  border-radius: 4px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
}
/* 鼠标悬停时暂停滚动，方便观看 */
.banner-scroll-section:hover .scroll-track {
  animation-play-state: paused;
}

@keyframes scrollLeft {
  0% { transform: translateX(0); }
  100% { transform: translateX(-50%); } /* 移动一半的距离实现无缝循环 */
}

/* ===== 3. 核心介绍区（左图右文） ===== */
.intro-layout {
  display: flex;
  align-items: center;
  gap: 50px;
  padding-top: 60px;
  padding-bottom: 60px;
}
.intro-image-box {
  flex: 1;
  min-width: 40%;
}
.intro-image-box img {
  width: 100%;
  border-radius: 8px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
  border: 1px solid #eee;
}
.intro-text-box {
  flex: 1.2;
}
.main-title {
  font-size: 1.8rem;
  color: #0055ff; /* 标题用品牌蓝 */
  margin-bottom: 20px;
  border-left: 5px solid #0055ff;
  padding-left: 15px;
}
.lead-text {
  font-size: 1.05rem;
  color: #555;
  margin-bottom: 25px;
  text-align: justify;
}
.feature-list {
  list-style: none;
}
.feature-list li {
  position: relative;
  padding-left: 20px;
  margin-bottom: 12px;
  color: #444;
  font-size: 1rem;
}
/* 自定义列表前的箭头 */
.feature-list li::before {
  content: "➤";
  position: absolute;
  left: 0;
  color: #0055ff;
  font-size: 0.9rem;
  top: 2px;
}
.feature-list strong {
  color: #000;
}

/* ===== 页脚 ===== */
.site-footer { 
  background: #f8f9fa; 
  color: #666; 
  text-align: center; 
  padding: 20px 0; 
  font-size: 0.9rem; 
  border-top: 1px solid #eee;
  margin-top: 40px;
}

/* ===== 响应式适配 ===== */
@media (max-width: 768px) {
  .menu-toggle { display: block; }
  .main-nav { 
    display: none; 
    position: absolute; top: 60px; left: 0; right: 0; 
    background: #0055ff; flex-direction: column; padding: 10px 0; 
  }
  .main-nav.open { display: flex; }
  .main-nav a { margin: 0; padding: 12px 20px; border-bottom: 1px solid rgba(255,255,255,0.1); }
  
  .intro-layout { flex-direction: column; }
  .intro-image-box { width: 100%; margin-bottom: 30px; }
  .main-title { font-size: 1.5rem; }
}