/* 全局重置 & 工具类 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
.page {
  max-width: 1920px; 
  margin: 0 auto;
  overflow-x: hidden;
}
.flex { display: flex; }
.justify-between { justify-content: space-between; }
.justify-center { justify-content: center; }
.items-center { align-items: center; }
.flex-wrap { flex-wrap: wrap; }
.gap-20 { gap: 20px; }
.gap-40 { gap: 40px; }

/* 头部导航 */
.header {
  position: relative; 
  width: 100%;
  overflow: hidden;
}
.header .nav-container {
  display: flex;
  align-items: center;
  padding: 15px 5%; 
  position: absolute;
  top: 0; 
  left: 0;
  right: 0;
  z-index: 2; 
  max-width: 1920px;
  margin: 0 auto;
  background: transparent; 
  transform: translateX(100px);
}
.header .logo {
  width: clamp(180px, 15vw, 300px);
  height: auto;
  flex-shrink: 0;
  margin-left: clamp(50px, 8%, 230px);
}
.header .nav-list {
  display: flex;
  align-items: center;
  list-style: none;
  padding: 0;
  margin: 0 0 0 auto;
  gap: clamp(20px,3vw,35px);
  transform: translateX(-55px);
}
.header .nav-item {
  color: #131313;
  font-size: 21px;
  text-decoration: none;
  font-weight: 500;
}
.house-system-item {
  background-color: #3645FF;
  padding: 8px 16px;
  border-radius: 25px;
  text-decoration: none;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  color: #fff;
  font-size: 21px;
  font-weight: 500;
  margin-left: 320px;
  transform: translateX(-120px);
}
.header .banner {
  width: 100%;
  height: auto; 
  margin-top: 0px; 
  display: block; 
  object-fit: cover;
}
.header .nav-item.active {
  color: #3645FF; 
  font-weight: 600; 
}

/* 通用区块标题 */
.section-title {
  font-size: 36px;
  font-weight: 600;
  color: #090c27;
  text-align: left;
  margin: 0 0 30px 0;
  border-left: 5px solid #338AF7;
  padding-left: 10px;
  margin-left: 50px;
}

/* 核心优势区 */
.intro-section {
  max-width: 1920px;
  margin: 0 auto;
  padding: 0 5%;
  margin-top: 40px;
  margin-bottom: 60px;
}
.advantage-icons {
  display: flex;
  justify-content: left; 
  margin-left: 50px;
}
.intro-text-wrap {
  text-align: left; 
  max-width: 800px;
  padding: 0 20px; 
}
.intro-paragraph {
  text-indent: 2em;
  line-height: 1.5;
  margin: 0 0 15px 0; 
  color: #333;
  font-size: 16px;
}
.intro-paragraph:last-child {
  margin-bottom: 0;
}
.advantage-item {
  flex: 0 0 500px; 
  min-width: 200px; 
  margin-top: -60px;
}
.advantage-item img {
  width: 100%;
  height: auto;
  object-fit: contain; 
  border-radius: 8px;
}
.advantage-text {
  font-size: 14px;
  color: #333;
}
/* 响应式适配（平板/手机） */
@media (max-width: 1200px) {
  .advantage-icons { gap: 20px; }
  .marketing-item { flex-direction: column; align-items: center; text-align: center; }
}
@media (max-width: 768px) {
  .section-title { font-size: 28px; }
  .header .nav-list { gap: 15px; }
  .header .nav-item { font-size: 14px; }
  .partner-item { width: 180px; height: 150px; }
}