:root {
    --primary: #2c3e50;
    --success: #42b983;
    --light: #f5f7fa;
    --white: #ffffff;
    --text-dark: #333;
    --text-gray: #666;
}
*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif;
}
body{
    background: var(--light);
    color:var(--text-dark);
    line-height: 1.6;
}
/* 导航栏 */
header{
    background:var(--primary);
    color:var(--white);
    padding:18px 5%;
    display:flex;
    justify-content:space-between;
    align-items:center;
    flex-wrap:wrap;
    box-shadow: 0 2px 10px rgba(0,0,0,0.1);
    width: 100%;
    z-index: 999;
}
.logo{
    font-size:24px;
    font-weight:bold;
    color:var(--white);
    text-decoration: none;
}
.nav{
    display: flex;
    align-items: center;
    gap:24px;
}
.nav a{
    color:var(--white);
    text-decoration:none;
    font-size:15px;
    font-weight:500;
    transition: opacity 0.2s;
}
.nav a:hover{
    opacity: 0.8;
}
/* 按钮 */
.btn-primary{
    background:var(--success);
    padding:8px 20px;
    border-radius:20px;
    font-weight:600;
}
/* 卡片 */
.card-container{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(280px,1fr));
    gap:25px;
}
.card{
    background:var(--white);
    padding:30px;
    border-radius:18px;
    box-shadow:0 5px 15px rgba(0,0,0,0.05);
    transition:transform 0.3s;
}
.card:hover{
    transform:translateY(-6px);
}
.icon-box{
    width:55px;
    height:55px;
    background:#e6f7ef;
    border-radius:12px;
    display:flex;
    align-items:center;
    justify-content:center;
    color:var(--success);
    font-size:22px;
    margin-bottom:20px;
}
/* 统计面板 */
.stats{
    max-width:1000px;
    margin:30px auto;
    padding:25px;
    background:var(--white);
    border-radius:15px;
    box-shadow:0 2px 15px rgba(0,0,0,0.05);
    text-align:center;
}
/* 底部 */
footer{
    background:var(--primary);
    color:var(--white);
    text-align:center;
    padding:40px 20px;
    margin-top:60px;
    font-size:14px;
}
footer a{
    color:var(--success);
    text-decoration:none;
    margin:0 8px;
}
/* 移动端适配 */
@media (max-width:768px){
    header{ padding:15px 4%; }
    .logo{ font-size:20px; }
    .nav{ gap:15px; }
}