*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}
html {
    scroll-behavior: smooth;
}
body{
    font-family: system-ui,-apple-system,Segoe UI,Roboto,Helvetica,Arial,sans-serif;
    background-color:#f9fafb;
    color:#1f2937;
    line-height:1.6;
}
.container{
    width:100%;
    max-width:1200px;
    margin:0 auto;
    padding:0 16px;
}
.section-padding{
    padding:80px 16px;
}
.card-shadow{
    box-shadow: 0 10px 30px rgba(0,0,0,0.08);
}
header{
    position:fixed;
    width:100%;
    top:0;
    z-index:99;
    background:rgba(255,255,255,0.9);
    backdrop-filter: blur(8px);
    box-shadow:0 2px 8px rgba(0,0,0,0.05);
}
.header-wrap{
    display:flex;
    justify-content:space-between;
    align-items:center;
    padding:16px 0;
    position:relative;
}
.logo-box{
    display:flex;
    align-items:center;
    gap:8px;
    text-decoration:none;
    color:#ffffff;
}
.logo-icon{
    width:40px;
    height:40px;
    background:#2563eb;
    border-radius:8px;
    display:flex;
    align-items:center;
    justify-content:center;
    color:#fff;
    font-weight:bold;
}
.logo-text{
    font-size:20px;
    font-weight:bold;
}
.nav-pc{
    display:flex;
    gap:32px;
}
.nav-pc .nav-item{
    display:inline-flex;
    align-items:center;
    gap:8px;
    text-decoration:none;
    color:#333;
    transition:all 0.2s;
    padding:4px 8px;
    border-radius:6px;
}
.nav-ico{
    width:20px;
    height:20px;
    object-fit:contain;
}
.nav-ico[src=""]{
    display:none;
}
.nav-pc .nav-item:hover{
    color:#2563eb;
}
.nav-pc .nav-item:active{
    color:#1d4ed8;
    background:rgba(37,99,235,0.1);
}
.nav-pc .nav-item.active{
    color:#2563eb;
    background:rgba(37,99,235,0.08);
}
/* ========== 汉堡按钮 & 移动端下拉菜单【修复display冲突】 ========== */
.menu-btn{
    display:none;
    font-size:26px;
    background:transparent;
    border:none;
    cursor:pointer;
    z-index:101;
    position:relative;
    padding:6px 10px;
    color:#333;
}
.nav-mobile{
    position: fixed;
    left:0;
    top:72px;
    width:100%;
    background:#ffffff;
    box-shadow:0 8px 16px rgba(0,0,0,0.1);
    z-index:100;
    overflow:hidden;
    max-height:0;
    transition:max-height 0.3s ease;
}
.nav-mobile.show{
    max-height:500px;
}
.nav-mobile .nav-item{
    display:flex;
    align-items:center;
    gap:8px;
    text-decoration:none;
    color:#333;
    padding:14px 20px;
    border-bottom:1px solid #f3f4f6;
    width:100%;
}
.nav-mobile .nav-item.active{
    color:#2563eb;
    background:rgba(37,99,235,0.08);
}
.nav-mobile .nav-item:active{
    background: #f3f4f6;
}
/* ====================================================== */
#home{
    padding-top:128px;
    padding-bottom:80px;
    background:linear-gradient(135deg,#eff6ff,#eef2ff);
}
.hero-grid{
    display:grid;
    grid-template-columns: 1fr 1fr;
    gap:40px;
    align-items:center;
}
.hero-title{
    font-size:clamp(2rem,5vw,3.5rem);
    font-weight:bold;
    line-height:1.2;
    color:#111827;
}
.hero-desc{
    margin-top:24px;
    font-size:18px;
    color:#4b5563;
    max-width:600px;
}
.hero-buttons{
    margin-top:32px;
    display:flex;
    flex-wrap:wrap;
    gap:16px;
}
.btn-primary{
    display:inline-flex;
    align-items:center;
    gap:8px;
    background:#2563eb;
    color:#fff;
    padding:12px 32px;
    border-radius:8px;
    text-decoration:none;
    transition:background 0.2s;
}
.btn-primary:hover{
    background:#1d4ed8;
}
.btn-outline{
    border:1px solid #2563eb;
    color:#2563eb;
    padding:12px 32px;
    border-radius:8px;
    text-decoration:none;
    transition:all 0.2s;
}
.btn-outline:hover{
    background:#2563eb;
    color:#fff;
}
.video-wrap{
    border-radius:12px;
    overflow:hidden;
    background:#000;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
}
video{
    width:100%;
    display:block;
}
#download{
    background:#ffffff;
}
.section-title-box{
    text-align:center;
    margin-bottom:56px;
}
.section-title{
    font-size:clamp(1.8rem,3vw,2.5rem);
    font-weight:bold;
}
.section-sub{
    margin-top:12px;
    color:#6b7280;
}
.download-grid{
    display:grid;
    grid-template-columns: repeat(4,1fr);
    gap:24px;
}
.download-card{
    background:#f9fafb;
    padding:24px;
    border-radius:12px;
    box-shadow:0 10px 30px rgba(0,0,0,0.08);
    transition:transform 0.3s;
}
.download-card:hover{
    transform:translateY(-8px);
}
.card-icon{
    font-size:40px;
    color:#2563eb;
    margin-bottom:16px;
}
.card-name{
    font-size:20px;
    font-weight:600;
}
.card-version{
    margin-top:8px;
    color:#6b7280;
}
.card-down-btn{
    display:inline-flex;
    align-items:center;
    gap:8px;
    background:#2563eb;
    color:#fff;
    padding:10px 20px;
    border-radius:8px;
    text-decoration:none;
    margin-top:20px;
    transition:background 0.2s;
}
.card-down-btn:hover{
    background:#1d4ed8;
}
#show{
    background:#f3f4f6;
}
.slide-container{
    position:relative;
    max-width:1100px;
    margin:0 auto;
}
.slide-wrap{
    border-radius:12px;
    overflow:hidden;
    box-shadow:0 10px 30px rgba(0,0,0,0.08);
    height:300px;
}
@media(min-width:768px){
    .slide-wrap{
        height:450px;
    }
}
.slide-item{
    display:none;
    width:100%;
    height:100%;
}
.slide-item.active{
    display:block;
}
.slide-item img{
    width:100%;
    height:100%;
    object-fit:cover;
    display:block;
}
.slide-btn{
    position:absolute;
    top:50%;
    transform:translateY(-50%);
    width:40px;
    height:40px;
    border-radius:50%;
    border:none;
    background:rgba(255,255,255,0.8);
    font-size:22px;
    font-weight:bold;
    cursor:pointer;
    display:flex;
    align-items:center;
    justify-content:center;
}
#prevSlide{
    left:12px;
}
#nextSlide{
    right:12px;
}
#advantage{
    background:#fff;
}
.advantage-grid{
    display:grid;
    grid-template-columns: repeat(3,1fr);
    gap:32px;
}
.adv-card{
    background:#f9fafb;
    padding:24px;
    border-radius:12px;
    box-shadow:0 10px 30px rgba(0,0,0,0.08);
}
.adv-icon{
    width:48px;
    height:48px;
    background:rgba(37,99,235,0.1);
    color:#2563eb;
    border-radius:8px;
    display:flex;
    align-items:center;
    justify-content:center;
    font-size:20px;
    margin-bottom:16px;
}
.adv-title{
    font-size:20px;
    font-weight:600;
}
.adv-desc{
    margin-top:8px;
    color:#4b5563;
}
#news{
    background:#f3f4f6;
}
.news-grid{
    display:grid;
    grid-template-columns: repeat(3,1fr);
    gap:32px;
}
.news-card{
    background:#fff;
    padding:24px;
    border-radius:12px;
    box-shadow:0 10px 30px rgba(0,0,0,0.08);
}
.news-card h3{
    font-size:20px;
    padding-bottom:12px;
    border-bottom:1px solid #e5e7eb;
    margin-bottom:16px;
}
.news-list li{
    list-style:none;
    margin-bottom:16px;
}
.news-list a{
    color:#333;
    text-decoration:none;
}
.news-list a:hover{
    color:#2563eb;
}
.news-date{
    color:#9ca3af;
    font-size:14px;
}
.news-line{
    display:flex;
    justify-content:space-between;
}
/* ========== footer ========== */
footer{
    background:#111827;
    color:#fff;
    padding:32px 16px;
}
.footer-wrap{
    max-width:1200px;
    margin:0 auto;
    display:flex;
    justify-content:space-between;
    flex-wrap:wrap;
    gap:24px;
}
.footer-left{
    max-width:320px;
}
.footer-left p{
    margin-top:12px;
    color:#9ca3af;
}
.footer-right{
    display:grid;
    grid-template-columns: repeat(3,1fr);
    gap:24px;
}
.footer-col h4{
    margin-bottom:10px;
}
.footer-col li{
    list-style:none;
    margin-bottom:6px;
}
.footer-col a{
    color:#9ca3af;
    text-decoration:none;
}
.footer-col a:hover{
    color:#fff;
}
.copyright{
    max-width:1200px;
    margin:24px auto 0;
    padding-top:16px;
    border-top:1px solid #333844;
    text-align:center;
    color:#6b7280;
    font-size:14px;
}
/* ============================================== */
@media(max-width:768px){
    .nav-pc{
        display:none !important;
    }
    .menu-btn{
        display:block;
    }
    .hero-grid{
        grid-template-columns:1fr;
    }
    .download-grid{
        grid-template-columns: repeat(2,1fr);
    }
    .advantage-grid{
        grid-template-columns: repeat(2,1fr);
    }
    .news-grid{
        grid-template-columns:1fr;
    }
    .footer-right{
        grid-template-columns: repeat(2,1fr);
        gap:20px;
    }
}
@media(max-width:480px){
    .download-grid{
        grid-template-columns:1fr;
    }
    .advantage-grid{
        grid-template-columns: repeat(2,1fr);
    }
    .footer-right{
        grid-template-columns:1fr;
    }
}
header .logo-box .logo-text {
    color: #1f2937;
}
.footer-logo-text {
    color: #ffffff;
}
.footer-logo-box .logo-icon {
    background:#2563eb;
    color:#fff;
}
video {
    width:100%;
    display:block;
    user-select: none;
    -webkit-user-select: none;
    pointer-events:auto;
}
.video-wrap{
    border-radius:12px;
    overflow:hidden;
    background:#000;
    box-shadow: 0 10px 30px rgba(0,0,0,0.1);
    user-select:none;
    -webkit-user-select:none;
}
.nav-pc .nav-item{
    display:inline-flex;
    align-items:center;
    gap:8px;
}
.nav-ico{
    width:20px;
    height:20px;
    object-fit:contain;
}
.nav-ico[src=""]{
    display:none;
}