* {box-sizing:border-box;margin:0;padding:0;font-family:Arial, sans-serif}
.container {max-width:1100px;margin:0 auto;padding:0 20px}
.header {background:#111;color:#fff;padding:16px 0}
.logo {font-size:22px;font-weight:bold}
.nav {margin-top:10px}
.nav a {color:#fff;text-decoration:none;margin-right:16px}
.hero {min-height: 420px;
  padding: 70px 0;
  text-align: center;
  background: linear-gradient(rgba(0,0,0,0.45), rgba(0,0,0,0.45)),
              url("../images/banner.jpg");
  background-size: cover;
  background-position: center;
  background-repeat: no-repeat;
  color: #fff;}
.hero h1 {font-size:36px;margin-bottom:16px}
.hero p {margin-bottom:24px}
.btn {display:inline-block;background:#007bff;color:#fff;padding:10px 20px;border-radius:4px;text-decoration:none;margin:0 6px;border:0;cursor:pointer;font-size:16px}
.btn.whatsapp {background:#25d366}
.section {padding:60px 0}
h2,h3 {margin-bottom:16px}
.grid {display:grid;grid-template-columns:repeat(auto-fit, minmax(260px,1fr));gap:20px}
.card {border:1px solid #eee;padding:20px;border-radius:6px}
.form label {display:block;margin:12px 0 4px}
.form input,.form textarea {width:100%;padding:10px;border:1px solid #ccc;border-radius:4px;font-size:16px}
.footer {background:#111;color:#fff;text-align:center;padding:20px 0;margin-top:40px}
ul {padding-left:20px}
.img-responsive {
  width: 100%;
  height: auto;
  border-radius: 6px;
  margin: 16px 0;
}
.main-nav {
  list-style: none;
  display: flex;
  gap: 24px;
  margin: 0;
  padding: 0;
}
.dropdown {
  position: relative;
}
.submenu {
  display: none;
  position: absolute;
  top: 100%;
  left: 0;
  background: #fff;
  box-shadow: 0 4px 12px rgba(0,0,0,0.12);
  list-style: none;
  padding: 0;
  min-width: 160px;
  z-index: 99;
}
.submenu li a {
  display: block;
  padding: 12px 16px;
  color: #222;
  text-decoration: none;
}
.dropdown:hover .submenu {
  display: block;
}
/* 产品轮播 */
.product-slider-wrap {
  padding-top: 10px;
  padding-bottom: 40px;
}
.slider-container {
  position: relative;
  overflow: hidden;
  padding: 0 40px;
}
.slider-track {
  display: flex;
  gap: 20px;
  transition: transform 0.4s ease;
}
.slide-item {
  flex: 0 0 calc(25% - 15px);
  text-align: center;
}
.slide-item a {
  text-decoration: none;
  color: #222;
}
.slide-item img {
  width: 100%;
  height: 220px;
  object-fit: cover;
  border-radius: 8px;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
  margin-bottom: 8px;
}
.slider-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  border: none;
  background: rgba(255,255,255,0.85);
  width: 36px;
  height: 36px;
  border-radius: 50%;
  font-size: 22px;
  cursor: pointer;
  z-index: 10;
}
.prev { left: 0; }
.next { right: 0; }

/* 移动端：一行只放 1 个 */
@media (max-width:768px){
  .slide-item {
    flex: 0 0 calc(100% - 10px);
  }
  .slide-item img {
    height: 240px;
  }
}
.logo {
  /* 左右、上下留白 */
  margin-left: -280px;    /* ← 往右：加大数字；往左：负数，例如 -10px */
  margin-right: 30px;   /* 和 HOME 菜单之间的距离 */
}
.logo img {
  height: 52px;
  width: auto;
  display: block;
  margin-top: 0px;      /* ← 往下：加大；往上：负数 -6px */
  margin-bottom: 0px;
}
.logo a {
  text-decoration: none;
}