* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: 'Segoe UI', sans-serif;
}
body {
  color: #333;
  background: #f8f9fa;
}
.container {
  width: 90%;
  max-width 1200px;
  margin: 0 auto;
}

/* ===================================
HEADER 样式
LOGO 居中
菜单 左对齐
导航下方 分割线
==================================== */
header {
  background: #0f172a;
  color: white;
  padding: 20px 0;
  border-bottom: 2px solid #1e293b; /* 分割线 */
}
.logo {
  font-size: 24px;
  font-weight: bold;
  text-align: center; /* LOGO 居中 */
  margin-bottom: 12px;
}
nav {
  text-align: left; /* 菜单左对齐 */
}
nav a {
  color: white;
  margin-right: 22px;
  text-decoration: none;
  transition: 0.3s;
}

/* 鼠标放上去变色 */
nav a:hover {
  color: #0ea5e9;
}

.banner {
  background: linear-gradient(rgba(0,0,0,0.5), rgba(0,0,0,0.5)), url('https://picsum.photos/id/160/1920/700') center/cover;
  color: white;
  padding: 120px 0;
  text-align: center;
}
.banner h1 {
  font-size: 44px;
  margin-bottom: 20px;
}
.banner p {
  font-size: 18px;
  max-width: 700px;
  margin: 0 auto 30px;
}

.btn {
  display: inline-block;
  padding: 12px 26px;
  background: #0ea5e9;
  color: white;
  border-radius: 6px;
  text-decoration: none;
  margin: 0 6px;
  transition: background 0.3s ease;
}
.btn:hover {
  background: #0284c7;
}
.btn-outline {
  background: transparent;
  border: 2px solid white;
}
.btn-outline:hover {
  background: rgba(255,255,255,0.1);
}
.btn-sm {
  padding: 8px 16px;
  background: #0ea5e9;
  color: white;
  border-radius: 4px;
  text-decoration: none;
  font-size: 14px;
}
.btn-sm:hover {
  background: #0284c7;
}

section {
  padding: 70px 0;
}
h2 {
  text-align: center;
  font-size: 32px;
  margin-bottom: 40px;
  color: #0f172a;
}

.grid {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: 30px;
}
.grid-4 {
  display: grid;
  grid-template-columns: repeat(4, 1fr);
  gap: 20px;
}
.card {
  background: white;
  border-radius: 10px;
  overflow: hidden;
  box-shadow: 0 4px 12px rgba(0,0,0,0.1);
  text-align: center;
  padding-bottom: 20px;
}
.card img {
  width: 100%;
  height: 240px;
  object-fit: cover;
}
.card h3 {
  margin: 18px 0 8px;
}

.adv {
  background: white;
  padding: 30px;
  border-radius: 10px;
  text-align: center;
  box-shadow: 0 2px 8px rgba(0,0,0,0.08);
}

.inquiry form, .contact form {
  max-width: 600px;
  margin: 0 auto;
}
input, textarea {
  width: 100%;
  padding: 14px;
  margin-bottom: 15px;
  border: 1px solid #ddd;
  border-radius: 6px;
}
textarea {
  height: 160px;
}

.page-banner {
  background: #0f172a;
  color: white;
  padding: 70px 0;
  text-align: center;
}
.page-banner h1 {
  font-size: 36px;
}

.post {
  background: white;
  padding: 25px;
  margin-bottom: 20px;
  border-radius: 10px;
}
.info {
  margin-top: 40px;
  text-align: center;
  font-size: 18px;
  line-height: 1.9;
}

.video {
  margin-bottom: 30px;
}

footer {
  background: #0f172a;
  color: white;
  text-align: center;
  padding: 35px 0;
  margin-top: 50px;
}

@media (max-width:768px) {
  .grid, .grid-4 {
    grid-template-columns: 1fr;
  }
  .banner h1 {
    font-size: 32px;
  }
}