/* 全局重置与基础样式 */
* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
  font-family: "Microsoft YaHei", sans-serif;
}
body {
  background-color: #ffffff;
  color: #333;
  line-height: 1.6;
}
.container {
  width: 90%;
  max-width: 1200px;
  margin: 0 auto;
  padding: 20px;
}

/* 头部样式 */
.header {
  display: flex;
  align-items: center;
  justify-content: center;
  flex-direction: column;
  padding: 30px 0;
  background: linear-gradient(to right, #165DFF, #FF7D00);
  color: white;
  border-radius: 0 0 20px 20px;
}
.logo-box {
  display: flex;
  align-items: center;
  gap: 15px;
  margin-bottom: 15px;
}
.logo {
  width: 60px;
  height: 60px;
}
.site-title {
  font-size: 28px;
  font-weight: bold;
}
.nav {
  margin-top: 20px;
}
.nav a {
  color: white;
  text-decoration: none;
  margin: 0 15px;
  font-size: 16px;
  font-weight: 500;
}
.nav a:hover {
  color: #FFD700;
}

/* 首页主体 */
.section-title {
  text-align: center;
  margin: 40px 0 20px;
  color: #165DFF;
  font-size: 24px;
}
.desc {
  text-align: center;
  font-size: 16px;
  color: #666;
  margin-bottom: 30px;
}

/* 产品展示图 */
.product-img {
  width: 100%;
  max-width: 900px;
  display: block;
  margin: 0 auto 40px;
  border-radius: 15px;
  box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

/* 三端下载按钮 */
.download-buttons {
  max-width: 600px;
  margin: 0 auto 50px;
}
.btn-main {
  width: 100%;
  background: #FF7D00;
  color: white;
  padding: 25px;
  border-radius: 15px;
  text-align: center;
  margin-bottom: 20px;
  cursor: pointer;
  transition: 0.3s;
  text-decoration: none;
  display: block;
}
.btn-main:hover {
  background: #e67000;
}
.btn-sub-box {
  display: flex;
  gap: 20px;
}
.btn-sub {
  flex: 1;
  background: #165DFF;
  color: white;
  padding: 25px;
  border-radius: 15px;
  text-align: center;
  cursor: pointer;
  transition: 0.3s;
  text-decoration: none;
}
.btn-sub:hover {
  background: #0047cc;
}
.btn-icon {
  font-size: 40px;
  margin-bottom: 10px;
}
.btn-text {
  font-size: 18px;
  font-weight: bold;
}
.btn-desc {
  font-size: 14px;
  margin-top: 5px;
  opacity: 0.9;
}

/* 产品介绍文章 */
.article-list {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(350px, 1fr));
  gap: 25px;
  margin: 40px 0;
}
.article-item {
  background: #f8f9fa;
  border-radius: 15px;
  overflow: hidden;
  box-shadow: 0 3px 10px rgba(0,0,0,0.05);
}
.article-img {
  width: 100%;
  height: 200px;
  object-fit: cover;
}
.article-content {
  padding: 20px;
}
.article-title {
  font-size: 18px;
  color: #165DFF;
  margin-bottom: 10px;
}
.article-text {
  font-size: 14px;
  color: #555;
  line-height: 1.7;
}

/* 版本更新 */
.update-list {
  background: #f2f7ff;
  padding: 30px;
  border-radius: 15px;
  margin: 40px 0;
}
.update-item {
  padding: 12px 0;
  border-bottom: 1px dashed #ccc;
}
.update-item:last-child {
  border: none;
}
.update-tag {
  display: inline-block;
  background: #FF7D00;
  color: white;
  padding: 3px 8px;
  border-radius: 5px;
  font-size: 12px;
  margin-right: 10px;
}

/* 底部 */
.footer {
  background: #165DFF;
  color: white;
  text-align: center;
  padding: 30px 0;
  margin-top: 50px;
  border-radius: 20px 20px 0 0;
}

/* 404页面 */
.page-404 {
  text-align: center;
  padding: 100px 20px;
}
.page-404 h1 {
  font-size: 120px;
  color: #FF7D00;
}
.page-404 p {
  font-size: 20px;
  margin: 20px 0;
}
.page-404 a {
  display: inline-block;
  background: #165DFF;
  color: white;
  padding: 12px 30px;
  border-radius: 10px;
  text-decoration: none;
  margin-top: 20px;
}