*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:"Microsoft Yahei",sans-serif;
}
:root{
    --main:#165DFF;
    --dark:#222831;
    --gray:#666;
    --light:#f5f7fa;
}
body{
    background:#fff;
    color:var(--dark);
    line-height:1.7;
}
header{
    background:#fff;
    box-shadow:0 2px 10px rgba(0,0,0,0.08);
    position:sticky;
    top:0;
    z-index:99;
}
.nav-wrap{
    max-width:1200px;
    margin:0 auto;
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:18px 20px;
}
.logo{
    font-size:24px;
    font-weight:bold;
    color:var(--main);
}
nav ul{
    display:flex;
    gap:36px;
    list-style:none;
}
nav a{
    text-decoration:none;
    color:#333;
    font-size:16px;
    transition:0.2s;
}
nav a.active, nav a:hover{
    color:var(--main);
}
.banner{
    background:linear-gradient(135deg,#165DFF,#4080ff);
    color:#fff;
    padding:100px 20px;
    text-align:center;
}
.banner h1{
    font-size:42px;
    margin-bottom:16px;
}
.banner p{
    font-size:18px;
    opacity:0.9;
    max-width:700px;
    margin:0 auto 30px;
}

/* APP截图预览样式 */
.swiper-box{
    width:100%;
    overflow-x:auto;
    padding:20px 0;
}
.swiper-row{
    display:flex;
    gap:20px;
    width:max-content;
}
.app-screen{
    width:240px;
    border-radius:14px;
    box-shadow:0 3px 14px rgba(0,0,0,0.1);
}
/* 网格备选，屏幕宽自动换行，不需要滚动 */
.grid-box{
    display:grid;
    grid-template-columns:repeat(auto-fit, minmax(220px, 1fr));
    gap:24px;
    padding-top:20px;
}
.grid-box img{
    width:100%;
    border-radius:14px;
    box-shadow:0 3px 14px rgba(0,0,0,0.1);
}

.btn{
    display:inline-block;
    padding:12px 32px;
    background:#fff;
    color:var(--main);
    border-radius:8px;
    text-decoration:none;
    font-weight:bold;
}
.container{
    max-width:1200px;
    margin:0 auto;
    padding:60px 20px;
}
.title{
    text-align:center;
    font-size:30px;
    margin-bottom:40px;
    color:var(--dark);
}
.card-wrap{
    display:grid;
    grid-template-columns:repeat(auto-fit, minmax(280px,1fr));
    gap:24px;
}
.card{
    background:#fff;
    padding:30px;
    border-radius:12px;
    box-shadow:0 4px 16px rgba(0,0,0,0.06);
}
.card h3{
    margin-bottom:12px;
    color:var(--main);
}
footer{
    background:#1f2937;
    color:#ccc;
    text-align:center;
    padding:30px 20px;
    font-size:14px;
}
.page-content h2{
    margin-bottom:20px;
    color:#1f2937;
}
.page-content p{
    margin-bottom:16px;
    color:#444;
}
.contact-info{
    background:var(--light);
    padding:32px;
    border-radius:12px;
}
.contact-info p{
    font-size:16px;
    margin:12px 0;
}
.img-box{
    width:100%;
    padding:20px 0;
}
.img-box img{
    width:100%;
    border-radius:12px;
    box-shadow:0 2px 12px rgba(0,0,0,0.08);
}
@media(max-width:768px){
    .nav-wrap{flex-direction:column;gap:16px;}
    nav ul{gap:20px;}
    .banner h1{font-size:28px;}
}