/* 全局公共样式 */
*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: "Microsoft Yahei",sans-serif;
}
ul{list-style: none;}
a{text-decoration: none;}
img{max-width:100%;display:block;}
:root{
    --main-blue:#165DFF;
    --light-blue:#E8F3FF;
    --white:#ffffff;
    --text-gray:#555;
    --dark-text:#222;
}
.container{
    width:92%;
    max-width:1320px;
    margin:0 auto;
}
/* 导航公共样式 */
.header-nav{
    background:var(--main-blue);
    padding:18px 0;
}
.nav-wrap{
    display:flex;
    justify-content:space-between;
    align-items:center;
}
.logo{
    color:var(--white);
    font-size:26px;
    font-weight:bold;
}
.nav-list{
    display:flex;
    gap:40px;
}
.nav-list li a{
    color:var(--white);
    font-size:16px;
    transition:0.3s;
}
.nav-list li a:hover{
    color:#cce2ff;
}
.btn-blue{
    display:inline-block;
    padding:12px 26px;
    background:var(--main-blue);
    color:#fff;
    border-radius:6px;
    border:none;
    cursor:pointer;
    transition:0.3s;
}
.btn-blue:hover{
    background:#0e48d8;
}
.btn-white{
    display:inline-block;
    padding:12px 26px;
    background:#fff;
    color:var(--main-blue);
    border:1px solid var(--main-blue);
    border-radius:6px;
    transition:0.3s;
}
.btn-white:hover{
    background:var(--light-blue);
}

/* ========== 首页专属样式 body#home ========== */
body#home{
    background:#f9fbff;
}
#home .banner{
    background:linear-gradient(135deg,#165DFF 0%,#4285ff 100%);
    padding:90px 0;
    color:#fff;
}
#home .banner-box{
    display:grid;
    grid-template-columns:1fr 1fr;
    align-items:center;
    gap:50px;
}
#home .banner-text h1{
    font-size:42px;
    margin-bottom:22px;
    line-height:1.3;
}
#home .banner-text p{
    font-size:17px;
    line-height:1.8;
    opacity:0.92;
    margin-bottom:35px;
}
#home .btn-group{
    display:flex;
    gap:20px;
}
#home .feature-area{
    padding:80px 0;
}
#home .sec-title{
    text-align:center;
    margin-bottom:60px;
}
#home .sec-title h2{
    font-size:32px;
    color:var(--dark-text);
    margin-bottom:12px;
}
#home .sec-title p{
    color:var(--text-gray);
    font-size:16px;
}
#home .feature-grid{
    display:grid;
    grid-template-columns:repeat(3,1fr);
    gap:32px;
}
#home .feature-card{
    background:var(--white);
    padding:36px 28px;
    border-radius:10px;
    box-shadow:0 3px 15px #e1ebff;
    border-top:4px solid var(--main-blue);
}
#home .feature-card h3{
    font-size:20px;
    color:var(--main-blue);
    margin-bottom:14px;
}
#home .feature-card p{
    line-height:1.7;
    color:var(--text-gray);
}
#home .nav-intro{
    padding:70px 0;
    background:var(--light-blue);
}
#home .intro-list{
    display:grid;
    grid-template-columns:repeat(4,1fr);
    gap:25px;
}
#home .intro-item{
    background:#fff;
    padding:30px 22px;
    border-radius:8px;
}
#home .faq-area{
    padding:80px 0;
}
#home .faq-wrap{
    max-width:900px;
    margin:0 auto;
}
#home .faq-item{
    background:#fff;
    margin-bottom:16px;
    padding:20px 24px;
    border-radius:7px;
    border-left:4px solid var(--main-blue);
}
#home .faq-item h4{
    font-size:17px;
    color:#222;
    margin-bottom:8px;
}
#home .faq-item p{
    color:#555;
    line-height:1.7;
}
#home footer{
    background:#0f4cd9;
    color:#fff;
    padding:40px 0;
    text-align:center;
}

/* ========== 产品页专属样式 body#product 布局：左右分栏+上下卡片，蓝白浅灰辅色 ========== */
body#product{
    background:#ffffff;
}
#product .top-banner{
    background:#f0f7ff;
    padding:65px 0;
}
#product .top-content{
    display:flex;
    flex-direction:column;
    gap:18px;
}
#product h1{
    font-size:36px;
    color:#165DFF;
}
#product .main-wrap{
    padding:75px 0;
    display:grid;
    grid-template-columns:320px 1fr;
    gap:45px;
}
#product .left-sidebar{
    background:var(--light-blue);
    padding:30px 22px;
    border-radius:9px;
    height:fit-content;
}
#product .left-sidebar h3{
    color:#165DFF;
    margin-bottom:22px;
    padding-bottom:12px;
    border-bottom:1px solid #c9e1ff;
}
#product .side-menu li{
    padding:13px 0;
    border-bottom:1px solid #ddeaff;
}
#product .side-menu li a{
    color:#333;
}
#product .side-menu li a:hover{
    color:#165DFF;
}
#product .right-content>div{
    margin-bottom:55px;
}
#product .pro-card{
    background:#f8fbff;
    padding:32px;
    border-radius:10px;
    margin-bottom:24px;
    border:1px solid #e0eeff;
}
#product .pro-card h3{
    color:#165DFF;
    margin-bottom:14px;
    font-size:22px;
}
#product footer{
    background:#2068e8;
    color:#fff;
    padding:35px 0;
    text-align:center;
}

/* ========== 交易指南页 body#guide 布局：瀑布流式卡片，蓝白+浅天蓝辅色 ========== */
body#guide{
    background:#f5f9ff;
}
#guide .guide-head{
    background:linear-gradient(#2471ff,#5392ff);
    padding:55px 0;
    color:#fff;
}
#guide .guide-head h1{
    font-size:35px;
    margin-bottom:15px;
}
#guide .guide-body{
    padding:70px 0;
}
#guide .guide-card-box{
    column-count:2;
    column-gap:35px;
}
#guide .guide-card{
    background:#fff;
    padding:28px;
    margin-bottom:30px;
    break-inside:avoid;
    border-radius:9px;
    box-shadow:0 2px 12px #e2edff;
}
#guide .guide-card h3{
    color:#165DFF;
    margin-bottom:13px;
    font-size:21px;
}
#guide footer{
    background:#1253e0;
    color:#fff;
    padding:32px 0;
    text-align:center;
}

/* ========== FAQ页面 body#faq 布局：上筛选栏+下多列问答卡片，蓝白+淡蓝灰 ========== */
body#faq{
    background:#fff;
}
#faq .faq-top-bar{
    background:#e9f2ff;
    padding:45px 0;
}
#faq .filter-tag{
    display:flex;
    gap:15px;
    margin:25px 0;
}
#faq .filter-tag span{
    padding:8px 18px;
    background:#fff;
    border:1px solid #165DFF;
    border-radius:20px;
    color:#165DFF;
    cursor:pointer;
}
#faq .filter-tag span.active{
    background:#165DFF;
    color:#fff;
}
#faq .faq-main{
    padding:70px 0;
}
#faq .faq-grid{
    display:grid;
    grid-template-columns:repeat(2,1fr);
    gap:30px;
}
#faq .faq-block{
    background:#f7fbff;
    padding:30px;
    border-radius:10px;
}
#faq .faq-block h3{
    color:#165DFF;
    margin-bottom:16px;
    padding-bottom:10px;
    border-bottom:1px solid #d7e8ff;
}
#faq footer{
    background:#0d4cd1;
    color:#fff;
    padding:35px 0;
    text-align:center;
}