* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei", sans-serif;
}
:root {
    --main-red: #de1b24;
    --dark-color: #333333;
    --bg-beige: #f3ede6;
    --gray-text: #666666;
}
a {
    text-decoration: none;
    color: inherit;
}
ul {
    list-style: none;
}
.container {
    width: 90%;
    max-width: 1200px;
    margin: 0 auto;
}
/*导航栏*/
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 15px 60px;
    box-shadow: 0 2px 8px rgba(0,0,0,0.1);
    position: sticky;
    top:0;
    background-color: #ffffff;
    z-index:99;
}
.logo-area{
    display:flex;
    align-items:center;
    gap:12px;
}
.logo-area img{
    height:60px;
}
.logo-text h2{
    color: var(--main-red);
    font-size:20px;
}
.logo-text p{
    color: var(--gray-text);
    font-size:13px;
}
.nav-list{
    display:flex;
    gap:40px;
}
.nav-list li a{
    font-size:16px;
    font-weight:500;
    color: var(--dark-color);
    transition:0.3s;
}
.nav-list li a:hover{
    color: var(--main-red);
}
.nav-list li a.active{
    color: var(--main-red);
}
/*公共标题*/
.title-head{
    text-align:center;
    margin-bottom:50px;
}
.title-head h3{
    font-size:28px;
    color: var(--dark-color);
    position:relative;
    display:inline-block;
}
.title-head h3::after{
    content:"";
    width:70px;
    height:3px;
    background-color: var(--main-red);
    position:absolute;
    left:50%;
    transform:translateX(-50%);
    bottom:-8px;
}
/*首页横幅banner*/
.banner{
    width:100%;
    min-height:800px;
    background: url("../images/bannerbg.jpg") no-repeat center center;
    background-size: cover;
    background-position:center center;
    position: relative;
    display:flex;
    flex-direction:column;
    justify-content:flex-start;
    align-items:center;
    text-align:center;    
    color:#ffffff;
    padding-top:0px;
}
.banner::before{
    content:'';
    position:absolute;
    left:0;
    top:0;
    width:100%;
    height:100%;
    background-color: rgba(255,255,255,0.05);
    z-index:1;
}
.banner h1,.banner .slogan,.banner p{
    position: relative;
    z-index:2;
}
.banner h1{
    font-size:36px;
    color:#701c1c;
    margin-bottom:15px;
}
.banner .slogan{
    font-size:22px;
    color: var(--main-red);
    font-weight:bold;
    margin-bottom:20px;
}
.banner p{
    width:70%;
    font-size:17px;
    line-height:1.8;
    color:#000000;
}
/*企业宗旨板块*/
.purpose{
    padding:70px 0;
}
.purpose-box{
    display:grid;
    grid-template-columns: repeat(4,1fr);
    gap:25px;
}
.purpose-item{
    padding:30px 20px;
    border:1px solid #8b6914;
    text-align:center;
    transition:0.3s;
}
.purpose-item:hover{
    border-color:#8b6914;
    box-shadow: 0 3px 15px rgba(139,105,20,0.15);
}
.purpose-item h4{
    font-size:19px;
    color: var(--main-red);
    margin-bottom:12px;
}
.purpose-item p{
    text-align: left;
    line-height:1.7;
    margin:0;
    padding-left:15px;
}
/*产品中心*/
.product-section{
    padding:70px 0;
    background-color: #fafafa;
}
.product-list{
    display:grid;
    grid-template-columns: repeat(3,1fr);
    gap:30px;
}
.product-card{
    background-color:#ffffff;
    overflow:hidden;
}
.product-card img{
    width:100%;
    height:560px;
    object-fit:cover;
    cursor: zoom-in;
    transition:0.3s;
}
.product-card img:hover{
    transform: scale(1.03);
}
.product-info{
    padding:18px;
}
.product-info h5{
    font-size:17px;
    color:var(--dark-color);
    margin-bottom:7px;
}
.product-info p{
    font-size:14px;
    color:var(--gray-text);
    line-height:1.6;
}
.product-info .go-detail{
    display:inline-block;
    margin-top:10px;
    color: var(--main-red);
}
/*图片弹窗样式*/
.img-modal{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background-color: rgba(0,0,0,0.85);
    z-index:999;
    display:none;
    align-items:center;
    justify-content:center;
    padding:30px;
}
.img-modal img{
    max-width:90%;
    max-height:90%;
}
.img-modal .close{
    position:absolute;
    top:20px;
    right:30px;
    font-size:40px;
    color:#fff;
    cursor:pointer;
}
/*关于我们*/
.about-us{
    padding:70px 0;
}
.about-content{
    display:flex;
    gap:50px;
    align-items:center;
}
.about-text{
    flex:1;
}
.about-text p{
    font-size:16px;
    line-height:2;
    color:#555;
    margin-top:15px;
}
/*详情页面样式*/
.level-box{
    padding:40px 0;
}
.level-item{
    display:flex;
    gap:30px;
    padding:30px 0;
    border-bottom:1px solid #eee;
    align-items:center;
}
.level-item img{
    width:450px;
    cursor:zoom-in;
}
.level-text h4{
    font-size:22px;
    color: var(--main-red);
    margin-bottom:15px;
}
/*留言表单页面*/
.form-section{
    padding:70px 0;
}
.form-box{
    width:600px;
    margin:0 auto;
    padding:40px;
    background:#fff;
    box-shadow:0 0 12px #ddd;
}
.form-item{
    margin-bottom:20px;
}
.form-item label{
    display:block;
    margin-bottom:8px;
    color:var(--dark-color);
}
.form-item input,.form-item select,.form-item textarea{
    width:100%;
    padding:12px;
    border:1px solid #ddd;
    font-size:15px;
}
.submit-btn{
    width:100%;
    padding:14px;
    background-color: var(--main-red);
    border:none;
    color:#fff;
    font-size:17px;
    cursor:pointer;
}
/*页脚*/
footer{
    background-color: var(--dark-color);
    color:#cccccc;
    padding:40px 60px;
    display:flex;
    justify-content:space-between;
}
.footer-left h4{
    color:#ffffff;
    font-size:18px;
    margin-bottom:15px;
}
/*移动端适配*/
@media(max-width:768px){
    header{
        flex-direction:column;
        padding:15px 20px;
    }
    .nav-list{
        margin-top:15px;
        gap:15px;
        flex-wrap:wrap;
        justify-content:center;
    }
    .purpose-box{
        grid-template-columns:1fr 1fr;
    }
    .product-list{
        grid-template-columns:1fr;
    }
    .about-content,.level-item{
        flex-direction:column;
    }
    .level-item img{
        width:100%;
    }
    .form-box{
        width:95%;
    }
    /\*banner适配手机 标题段落缩小\*/
    .banner{
        min-height:550px;
        padding-top:50px;
    }
    .banner h1{
        font-size:26px;   /\*banner大标题由36px缩小到26px\*/
    }
    .banner .slogan{
        font-size:18px;   /\*副标题22px →18px\*/
    }
    .banner p{
        width:92%;
        font-size:15px;   /\*介绍文字17px →15px\*/
    }
}