*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:Arial,"PingFang SC","Microsoft YaHei",sans-serif;
}

body{
    background:#0b0f1a;
    color:#fff;
    line-height:1.6;
    -webkit-font-smoothing:antialiased;
    padding-top:70px; /* 解决header遮挡 */
}

/* ================= 容器 ================= */
.container{
    max-width:1200px;
    margin:auto;
    padding:20px;
}

/* ================= 标题 ================= */
h1,h2,h3{
    margin-bottom:15px;
    letter-spacing:0.5px;
}

/* ================= 按钮（增强转化） ================= */
.btn{
    display:inline-block;
    padding:14px 28px;
    background:linear-gradient(135deg,#00d4ff,#00aacc);
    color:#000;
    border-radius:8px;
    text-decoration:none;
    margin-top:15px;
    font-weight:700;
    transition:0.25s;
    box-shadow:0 6px 18px rgba(0,212,255,0.25);
}

.btn:hover{
    transform:translateY(-2px);
    box-shadow:0 10px 25px rgba(0,212,255,0.35);
}

/* ================= HERO ================= */
.hero{
    background:radial-gradient(circle at top,#0a1f3d,#000);
    text-align:center;
    padding:110px 20px;
}

.hero h1{
    font-size:44px;
}

.hero p{
    opacity:0.75;
}

/* ================= SECTION ================= */
.section{
    padding:10px 10px;
}

/* ================= GRID ================= */
.grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(240px,1fr));
    gap:20px;
}

/* ================= CARD ================= */
.card{
    background:linear-gradient(145deg,#121826,#0f1524);
    padding:22px;
    border-radius:12px;
    transition:0.25s;
    border:1px solid rgba(255,255,255,0.05);
}

.card:hover{
    transform:translateY(-6px);
    border-color:rgba(0,212,255,0.3);
}

/* ================= 强调色 ================= */
.highlight{
    color:#00d4ff;
}

/* ================= 对比模块 ================= */
.compare{
    display:grid;
    grid-template-columns:1fr 1fr;
    gap:20px;
}

.compare div{
    background:#121826;
    padding:22px;
    border-radius:12px;
    border:1px solid rgba(255,255,255,0.05);
}

/* ================= CTA ================= */
.cta{
    text-align:center;
    background:linear-gradient(135deg,#00d4ff,#00aacc);
    color:#000;
    padding:70px 20px;
}

.cta h2{
    color:#000;
}

/* ================= FOOTER ================= */
.footer{
    text-align:center;
    padding:35px;
    background:#000;
    font-size:13px;
    opacity:0.65;
}

/* ================= HEADER ================= */
.site-header{
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:70px;
    background:rgba(0,0,0,0.6);
    backdrop-filter:blur(10px);
    display:flex;
    align-items:center;
    padding:0 20px;
    z-index:1000;
}

.logo{
    display:flex;
    align-items:center;
    gap:10px;
}

.logo img{
    height:50px;
    width:auto;
    object-fit:contain;
}

.logo span{
    font-size:18px;
    font-weight:bold;
    color:#00d4ff;
}

/* ================= 浮动按钮 ================= */
.float-box{
    position:fixed;
    right:20px;
    bottom:50px;
    z-index:999;
}

.float-btn{
    display:block;
    margin:10px;
    padding:15px;
    border-radius:50%;
    text-align:center;
    box-shadow:0 6px 20px rgba(0,0,0,0.3);
    transition:0.25s;
}

.float-btn:hover{
    transform:scale(1.08);
}

.phone{
    background:#00d4ff;
    color:#000;
}

.wechat{
    background:#25D366;
    color:#fff;
}

/* ================= 表单 ================= */
.form-box{
    display:none;
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,0.75);
    z-index:1000;
}

.form-content{
    background:#fff;
    color:#000;
    padding:30px;
    margin:12% auto;
    width:320px;
    border-radius:10px;
}

.form-content input{
    width:100%;
    margin:10px 0;
    padding:10px;
    border:1px solid #ddd;
    border-radius:6px;
}

.form-content button{
    width:100%;
    background:#00d4ff;
    padding:12px;
    border:none;
    border-radius:6px;
    font-weight:bold;
}

/* ================= 二维码弹窗 ================= */
.qr-box{
    display:none;
    position:fixed;
    top:0;
    left:0;
    width:100%;
    height:100%;
    background:rgba(0,0,0,0.75);
    z-index:1000;
}

.qr-content{
    background:#fff;
    color:#000;
    padding:25px;
    border-radius:12px;
    text-align:center;
    width:280px;
    position:absolute;
    top:50%;
    left:50%;
    transform:translate(-50%,-50%) scale(0.85);
    animation:popup 0.25s forwards;
    box-shadow:0 20px 60px rgba(0,0,0,0.4);
}

.qr-content img{
    width:200px;
    margin:15px 0;
    border-radius:8px;
}

.close{
    position:absolute;
    top:8px;
    right:12px;
    cursor:pointer;
    font-size:22px;
}

@keyframes popup{
    to{
        transform:translate(-50%,-50%) scale(1);
    }
}

/* ================= 图片模块（核心修复） ================= */
.img-box{
    width:90%;
    max-width:850px;
    margin:20px auto;

    display:flex;
    flex-direction:column;
    gap:12px;
}

.img-box img{
    width:100%;
    height:auto;          /* 关键：防止裁剪 */
    display:block;
    border-radius:10px;
    box-shadow:0 8px 25px rgba(0,0,0,0.25);
    transition:0.3s;
}

.img-box img:hover{
    transform:scale(1.02);
}

/* ================= 响应式 ================= */
@media(max-width:768px){
    .hero h1{
        font-size:30px;
    }

    .compare{
        grid-template-columns:1fr;
    }

    .form-content{
        width:90%;
    }

    .logo span{
        font-size:14px;
    }
}

/* ================= 文章推荐模块 ================= */
.article-grid{
    display:grid;
    grid-template-columns:repeat(auto-fit,minmax(260px,1fr));
    gap:20px;
    margin-top:20px;
}

/* 卡片 */
.article-card{
    display:block;
    background:#121826;
    padding:20px;
    border-radius:12px;
    text-decoration:none;
    color:#fff;
    transition:0.25s;
    border:1px solid rgba(255,255,255,0.05);
}

/* 标题 */
.article-card h3{
    font-size:18px;
    margin-bottom:10px;
    color:#00d4ff;
}

/* 描述 */
.article-card p{
    font-size:14px;
    opacity:0.7;
}

/* hover效果 */
.article-card:hover{
    transform:translateY(-5px);
    border-color:#00d4ff;
}