*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:"Microsoft YaHei";
}

body{
    background:#fff;
    color:#222;
    overflow-x:hidden;
}

.container{
    width:1200px;
    margin:auto;
}

header{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    z-index:999;
    background:rgba(255,255,255,.95);
    border-bottom:1px solid #eee;
}

.nav{
    height:80px;
    display:flex;
    align-items:center;
    justify-content:space-between;
}

.logo{
    font-size:28px;
    font-weight:bold;
}

.menu{
    display:flex;
    gap:40px;
}

.menu a{
    color:#222;
    text-decoration:none;
    font-size:16px;
}

.banner{
    height:100vh;
    background:url('https://images.unsplash.com/photo-1520607162513-77705c0f0d4a?q=80&w=1920&auto=format&fit=crop') center/cover no-repeat;
    display:flex;
    align-items:center;
    justify-content:center;
    text-align:center;
    color:#fff;
    position:relative;
}

.banner::after{
    content:'';
    position:absolute;
    inset:0;
    background:rgba(0,0,0,.45);
}

.banner-content{
    position:relative;
    z-index:2;
}

.banner h1{
    font-size:72px;
    margin-bottom:30px;
}

.banner p{
    font-size:24px;
    line-height:1.8;
}

.section{
    padding:100px 0;
}

.title{
    text-align:center;
    margin-bottom:60px;
}

.title h2{
    font-size:42px;
    margin-bottom:20px;
}

.title p{
    color:#888;
}

.about-grid{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:60px;
    align-items:center;
}

.about-grid img{
    width:100%;
    border-radius:20px;
}

.about-text{
    line-height:2;
    color:#666;
    font-size:17px;
}

.bg{
    background:#f5f5f5;
}

.card-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:30px;
}

.card{
    background:#fff;
    border-radius:20px;
    overflow:hidden;
    box-shadow:0 10px 30px rgba(0,0,0,.08);
    transition:.4s;
}

.card:hover{
    transform:translateY(-10px);
}

.card img{
    width:100%;
    height:260px;
    object-fit:cover;
}

.card-body{
    padding:30px;
}

.card-body h3{
    margin-bottom:15px;
    font-size:24px;
}

.card-body p{
    color:#666;
    line-height:1.8;
}

.product-grid{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:30px;
}

.product-item{
    background:#111;
    color:#fff;
    padding:60px 20px;
    text-align:center;
    border-radius:16px;
}

.dark{
    background:#111;
    color:#fff;
}

.stats{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:30px;
    text-align:center;
}

.stats h3{
    font-size:56px;
    margin-bottom:10px;
}

.contact-box{
    background:#f5f5f5;
    border-radius:20px;
    padding:50px;
}

.contact-box form{
    display:grid;
    gap:20px;
}

.contact-box input,
.contact-box textarea{
    width:100%;
    border:1px solid #ddd;
    border-radius:10px;
    padding:15px;
    font-size:16px;
}

.contact-box textarea{
    height:150px;
    resize:none;
}

.contact-box button{
    height:55px;
    border:none;
    background:#111;
    color:#fff;
    border-radius:10px;
    cursor:pointer;
    font-size:16px;
}

footer{
    background:#111;
    color:#aaa;
    text-align:center;
    padding:40px 0;
}

footer a{
    color:#aaa;
    text-decoration:none;
}

@media(max-width:768px){

.container{
    width:92%;
}

.menu{
    display:none;
}

.banner h1{
    font-size:42px;
}

.banner p{
    font-size:18px;
}

.about-grid,
.card-grid,
.product-grid,
.stats{
    grid-template-columns:1fr;
}

}