/* 全局样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Arial', sans-serif;
}

body {
    background-color: #f5f5f5;
    color: #333;
    line-height: 1.6;
}

header {
    transition: 0.3s;
    background-color: #fff;
    text-align: center;
    padding: 1rem;
    box-shadow: 0 2px 5px rgba(0,0,0,0.1);
}

a {
    color: #3498db;
    /*color: #ff0000;*/
    text-decoration: none;
    transition: color 0.3s;
}

header h2 {
    transition: 0.3s;
    color: #2c3e50;
    margin-bottom: 0.5rem;
}

header p {
    color: #7f8c8d;
    font-size: 1rem;
}

/* 主要内容区域 */
.container {
  max-width: 1200px;
  width: 100%;
  margin: 0 auto;
  padding: 0 1rem;
}

.main {
  transition: 0.3s;
  margin: 2rem auto; /* ← 关键：左右 1rem 外边距 */
  background-color: #fff;
  border-radius: 8px;
  padding: 1.5rem 2rem;
  box-shadow: 0 2px 10px rgba(0,0,0,0.05);
}

.mainTitle {
    display: flex;
    justify-content: space-between;
    color: #2c3e50;
    margin-bottom: 1.5rem;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid #eee;
}

.copy-btn{
    margin-left:10px;
    padding:3px 7px;
    border:none;
    border-radius:4px;
    background:#3498db;
    color:#fff;
    cursor:pointer;
    font-size:12px;
}

.copy-btn:hover{
    opacity:.9;
}

/* 论坛地址样式 */
#lturl p {
    line-height: 2.5rem;
}

/* APP下载区域 */
.app-desc {
    color: #7f8c8d;
    margin-bottom: 2rem;
    line-height: 1.6;
}

.download-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 2rem;
}

.download-card {
    background-color: #f9f9f9;
    border-radius: 8px;
    padding: 1rem;
    transition: transform 0.3s, box-shadow 0.3s;
}

.download-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 5px 15px rgba(0,0,0,0.1);
}

.platform-header {
    display: flex;
    flex-wrap: wrap;
    justify-content: space-between;
    margin-bottom: 1rem;
    border-bottom: 2px solid #eee;
    padding-bottom: 0.5rem;
}



.update-time {
    color: #95a5a6;
    font-size: 0.9rem;
}

.download-btn {
    display: inline-block;
    background-color: #3498db;
    /*background-color: #ff0000;*/
    color: white;
    padding: 0.5rem 1rem;
    border-radius: 5px;
    text-decoration: none;
    transition: background-color 0.3s;
    margin-bottom: 1.5rem;
    font-weight: bold;
}

.download-btn:hover {
    background-color: #2980b9;
}

.qr-section {
    text-align: center;
}

.qr-caption {
    margin-bottom: 0.5rem;
    color: #7f8c8d;
}

.qr-code {
    max-width: 150px;
    height: auto;
    border-radius: 5px;
}

/* 加入群聊区域 */
section.main:last-child p {
    margin-bottom: 1rem;
}

/* 响应式设计 */
@media (max-width: 768px) {

    header {
        transition: 0.3s;        
        padding: 0.5rem 1.5rem;
    }

    header h2 {
        transition: 0.3s;
        font-size: 1.3rem;
        margin-bottom: 0;
    }

    header p {
        transition: 0.3s;
        font-size: 0.8rem;
    }

    .main {
      margin: 1.5rem auto; /* ← 关键：左右 1rem 外边距 */
      padding: 1rem 1.5rem;
    }
    
    .download-grid {
        grid-template-columns: 1fr;
    }
}