* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    font-family: system-ui, -apple-system, BlinkMacSystemFont, "Microsoft YaHei", Inter, sans-serif;
}
html {
    scroll-behavior: smooth;
}
body {
    background-color: #ffffff;
    color: #111827;
    padding-top: 70px;
}
header {
    width: 100%;
    height: 70px;
    background-color: #000000;
    position: fixed;
    top: 0;
    z-index: 99;
    border-bottom: 1px solid #222222;
}
.header-inner {
    max-width: 1200px;
    margin: 0 auto;
    height: 70px;
    padding: 0;
    display: flex;
    align-items: center;
    justify-content: space-between;
}
.logo {
    display: flex;
    align-items: center;
    height: 70px;
}
.logo img {
    height: 42px;
    width: auto;
    object-fit: contain;
    transition: transform 0.24s ease;
}
.logo img:hover {
    transform: scale(1.04);
}
nav {
    display: flex;
    align-items: center;
}
nav ul {
    display: flex;
    gap: 64px;
    list-style: none;
}
nav a {
    color: #ffffff;
    text-decoration: none;
    font-size: 15px;
    font-weight: 600;
    line-height: 70px;
    transition: color 0.2s ease;
}
nav a:hover {
    color: #165DFF;
}
#hamburger-checkbox {
    display: none;
}
.hamburger {
    display: none;
    font-size: 26px;
    cursor: pointer;
    color:#ffffff;
    margin-left:24px;
    user-select: none;
}
#hamburger-checkbox:checked ~ .mobile-nav {
    display:block;
}
.mobile-nav {
    display:none;
    position:absolute;
    top:70px;
    left:0;
    width:100%;
    background:#fff;
    border-bottom:1px solid #E5E7EB;
    padding:20px 6vw;
}
.mobile-nav ul{
    flex-direction:column;
    gap:18px;
}
.mobile-nav a {
    font-weight:600;
    font-size:15px;
    color:#000;
    text-decoration:none;
}
.mobile-nav a:hover{
    color:#165DFF;
}
.mobile-nav.active{
    display:block;
}
#case,
#effect,
#material,
#preset,
#slogan,
#about {
    scroll-margin-top: 80px;
}
.fullwidth-ad-wrap{
    width:100%;
    padding: 28px 6vw 18px;
}
.ad-inner{
    max-width: 1200px;
    margin:0 auto;
}
.top-ad-pair {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap:18px;
}
.top-ad-card {
    position: relative;
    display: block;
    width: 100%;
    height: 75px;
    border-radius: 0;
    overflow: hidden;
    background: #F3F4F6;
    transition: transform 0.25s ease, box-shadow 0.25s ease;
}
.top-ad-card img {
    width: 100%;
    height: auto;
    object-fit: contain;
    object-position: center;
    display: block;
}
.top-ad-card:hover {
    transform: translateY(-3px);
    box-shadow: 0 10px 24px rgba(0, 0, 0, 0.12);
}
#backTop {
    position: fixed;
    right: 32px;
    bottom: 100px;
    width: 46px;
    height: 46px;
    background: #165DFF;
    border-radius: 0;
    color: #fff;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 22px;
    cursor: pointer;
    box-shadow: 0 4px 14px rgba(22, 93, 255, 0.3);
    opacity: 0;
    visibility: hidden;
    transition: all 0.3s ease;
    z-index: 98;
}
#backTop.show {
    opacity: 1;
    visibility: visible;
}
#backTop:hover {
    background: #0e4bdb;
}
.float-contact{
    position:fixed;
    right:32px;
    bottom:160px;
    background:#ffffff;
    border:1px solid #E5E7EB;
    border-radius:0;
    padding:14px;
    box-shadow:0 6px 22px rgba(0,0,0,0.09);
    z-index:97;
    text-align:center;
    width:130px;
}
.float-contact .tip{
    font-size:13px;
    color:#4B5563;
    margin-top:6px;
}
.float-contact .wxid{
    color:#165DFF;
    font-weight:500;
    font-size:14px;
}
.float-qr{
    max-width:90px;
    height:auto;
    border-radius:0;
    display:block;
    margin:0 auto;
    transition: transform 0.26s ease;
}
.float-contact:hover .float-qr{
    transform: scale(1.08) translateY(-3px);
}
footer {
    width: 100%;
    padding: 70px 6vw;
    background: #000000;
    color: #D1D5DB;
}
.footer-container {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 40px;
    max-width:1200px;
    margin:0 auto 50px;
}
.footer-col {
    text-align: left;
}
.footer-col h4 {
    color: #ffffff;
    font-size: 17px;
    margin-bottom: 20px;
}
.footer-col ul {
    list-style: none;
}
.footer-col li {
    margin-bottom: 12px;
}
.footer-col a {
    color: #9CA3AF;
    text-decoration: none;
    font-size:14px;
}
.footer-col a:hover {
    color: #165DFF;
}
.footer-contact {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 14px;
}
.footer-contact-info {
    display: flex;
    flex-direction: column;
    align-items: flex-start;
    gap: 6px;
}
.footer-qr{
    width: 112px;
    max-width: 112px;
    height:auto;
    border-radius:0;
    display:block;
}
.footer-qrcode-tip {
    font-size:14px;
    color:#9CA3AF;
    line-height:1.8;
    text-align: left;
}
.footer-copyright {
    max-width:1200px;
    margin:0 auto;
    padding-top:30px;
    border-top:1px solid #222222;
    font-size:14px;
    color:#6B7280;
    display:flex;
    flex-wrap:wrap;
    justify-content:space-between;
    gap:10px;
}
.footer-copyright a{
    color:#6B7280;
    text-decoration:none;
}
.footer-copyright a:hover{
    color:#165DFF;
}
.btn-blue {
    padding: 14px 32px;
    background: #165DFF;
    color: #fff;
    border: none;
    border-radius: 0px;
    font-size: 16px;
    cursor: pointer;
    transition:0.2s;
}
.btn-blue:hover {
    background: #0e4bdb;
}
.community-banner {
    width: 100%;
    padding: 85px 6vw;
    background: #ffffff;
    text-align: center;
}
.community-banner .line1 {
    font-size: 28px;
    font-weight: 500;
    margin-bottom: 16px;
    color: #111827;
}
.community-banner .line2 {
    font-size: 20px;
    color: #374151;
    margin-bottom: 36px;
}
@media screen and (max-width:1240px){
    .header-inner{
        padding:0 24px;
    }
}
@media screen and (max-width:992px){
    nav ul{
        display:none;
    }
    .hamburger{
        display:block;
    }
}
@media screen and (max-width:768px){
    .header-inner{
        padding:0 16px;
    }
    .fullwidth-ad-wrap{
        padding:24px 6vw 14px;
    }
    .top-ad-pair {
        grid-template-columns: 1fr;
        gap:12px;
    }
    .top-ad-card {
        height: 75px;
    }
    .community-banner{
        padding:60px 6vw;
    }
    .community-banner .line1{
        font-size:24px;
    }
    .community-banner .line2{
        font-size:18px;
    }
    .float-contact{
        display:none;
    }
    footer{
        padding:50px 6vw;
    }
    .footer-qr{
        width: 96px;
        max-width: 96px;
    }
}
img,video{
    -webkit-user-select: none;
    user-select: none;
    -webkit-touch-callout: none;
}