* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: 'Helvetica Neue', Helvetica, 'PingFang SC', 'Hiragino Sans GB', 'Microsoft YaHei', Arial, sans-serif;
}

body {
    background: linear-gradient(135deg, #1e5799 0%, #207cca 51%, #2989d8 100%);
    color: #333;
    min-height: 100vh;
    padding: 20px;
}

.container {
    max-width: 1200px;
    margin: 0 auto;
}

header {
    text-align: center;
    padding: 30px 0;
    margin-bottom: 30px;
}

h1 {
    color: #fff;
    font-size: 2.5rem;
    text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
    margin-bottom: 10px;
}

img {
  max-width: 60%;   /* 限制最大宽度不超过父容器 */
  height: auto;      /* 保持原始宽高比例 */
  display: block;    /* 去除图片底部间隙 */
}

.subtitle {
    color: #e6f7ff;
    font-size: 1.2rem;
    max-width: 800px;
    margin: 0 auto;
    opacity: 0.9;
}

.dashboard {
    background-color: rgba(255, 255, 255, 0.95);
    border-radius: 10px;
    box-shadow: 0 5px 20px rgba(0, 0, 0, 0.15);
    overflow: hidden;
    padding: 25px;
    margin-bottom: 30px;
}

.card-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
    gap: 25px;
    margin-bottom: 30px;
}

.card {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 12px rgba(0, 0, 0, 0.08);
    padding: 25px;
    transition: all 0.3s ease;
    border-left: 4px solid #409EFF;
}

.card:hover {
    transform: translateY(-5px);
    box-shadow: 0 8px 20px rgba(0, 0, 0, 0.15);
}

.card-header {
    display: flex;
    align-items: center;
    margin-bottom: 20px;
}

.card-icon {
    font-size: 2rem;
    color: #409EFF;
    margin-right: 15px;
}

.card-title {
    font-size: 1.3rem;
    font-weight: 600;
    color: #1f2d3d;
}

.card-content {
    color: #000000;
    line-height: 4;
    text-align: justify;
    line-height: 40px;
    padding-right: 20px;
    padding-left: 20px;
}

.section-title {
    font-size: 1.5rem;
    color: #1f2d3d;
    margin: 30px 0 20px;
    padding-bottom: 10px;
    border-bottom: 2px solid #eaeefb;
}

.footer {
    text-align: center;
    padding: 25px;
    color: rgba(255, 255, 255, 0.8);
    font-size: 0.9rem;
}

.highlight {
    background: linear-gradient(120deg, #e0c3fc 0%, #8ec5fc 100%);
    padding: 25px;
    border-radius: 8px;
    margin: 30px 0;
    color: #1f2d3d;
}

.highlight-title {
    font-size: 1.4rem;
    margin-bottom: 15px;
    display: flex;
    align-items: center;
}

.highlight-title i {
    margin-right: 10px;
    font-size: 1.8rem;
}

.code-block {
    background: #2d2d2d;
    color: #f8f8f2;
    border-radius: 8px;
    padding: 20px;
    margin: 20px 0;
    overflow-x: auto;
    font-family: 'Courier New', monospace;
    font-size: 0.95rem;
    line-height: 1.5;
}

.card-content h2 {
    color: #1e5799;;
    font-size: 1.5rem;
    line-height: 4.5;
}

.card-content ol {
    padding-left: 20px;
}

.card-content ul {
    padding-left: 20px;
}

/* 不同设备的浏览器适配 */
@media (max-width: 768px) {
    
    /* 视口单位动态计算 */
    :root {
      --base-size: calc(12px + 0.5vw); 
    }
    h1 { font-size: calc(var(--base-size) * 2) }
    
    img {
      max-width: 100%;
      height: auto;
      display: block;
    }
    
    .subtitle {
        color: #e6f7ff;
        font-size: calc(var(--base-size) * 1.2);
        max-width: 600px;
        margin: 0 auto;
        opacity: 0.9;
    }
    
    .dashboard {
        padding: 5px;
    }
    
    .card-container {
        grid-template-columns: 1fr;
        line-height: 1.2;
        line-height: 10px;
    }
    
    .card-content {
        padding-top: 20px;
    }
    
    .card-content h2 {
        color: #1e5799;;
        font-size: 1.2rem;
        line-height: 1.8;
    }            
}