*{
    margin:0;
    padding:0;
    box-sizing:border-box;
}

body{
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Microsoft YaHei",sans-serif;

    /* 渐变背景 */
    background: linear-gradient(135deg,#f7b2b2,#fce4e4);
    
    height:100vh;
    overflow:hidden;   /* ❗禁止滚动 */
}

/* ===== 中间背景图 ===== */
.bg-center{
    position:fixed;
    top:0;
    left:50%;
    transform:translateX(-50%);
    width:100%;
    max-width:500px;
    z-index:0;
}

.bg-center img{
    width:100%;
    display:block;
}

/* ===== 顶部LOGO ===== */
.top-logo{
    position:fixed;
    top:10px;
    left:0;
    width:100%;
    text-align:center;
    z-index:2;
}

.top-logo img{
    height:40px;
}

/* ===== 主体 ===== */
.main{
    min-height:100vh;
    display:flex;
    flex-direction:column;
    align-items:center;

    padding-top:360px; /* 整体往下 */
    z-index:1;
    position:relative;
}

/* ===== 顶部按钮 ===== */
.top-btns{
    display:flex;
    gap:40px;
    margin-bottom:5px;
}

/* ===== 大按钮（立体）===== */
.btn{
    padding:14px 32px;
    border-radius:30px;
    text-decoration:none;
    color:#fff;
    font-size:15px;
    font-weight:600;

    background: linear-gradient(145deg,#4f8cff,#2563eb);

    box-shadow:
        0 6px 15px rgba(37,99,235,0.4),
        inset 0 1px 0 rgba(255,255,255,0.3);

    transition: all 0.15s ease;
}

/* 悬浮 */
.btn:hover{
    transform: translateY(-2px);
}

/* 点击 */
.btn:active{
    transform: translateY(2px) scale(0.95);
    box-shadow:
        inset 0 3px 6px rgba(0,0,0,0.2);
}

/* ===== 卡片 ===== */
.card{
    display:flex;
    justify-content:space-between;
    align-items:center;

    background:#fff;
    margin:8px 0;
    padding:14px;

    width:90%;
    max-width:380px;

    border-radius:14px;
    box-shadow:0 5px 15px rgba(0,0,0,0.05);
}

/* 小按钮 */
.card a{
    background: linear-gradient(145deg,#ff3b5f,#e11d48);
    color:#fff;
    padding:8px 16px;
    border-radius:20px;
    text-decoration:none;
    font-size:13px;
    font-weight:600;

    box-shadow:
        0 4px 10px rgba(225,29,72,0.4);

    transition: all 0.15s ease;
}

/* 点击动画 */
.card a:active{
    transform: scale(0.9);
}

/* ===== 提示 ===== */
.tips{
    margin-top:20px;
    font-size:12px;
    color:#777;
}

/* ===== 手机适配 ===== */

@media (max-width: 768px){
    .main{
        padding-top:290px;   /* 手机往上拉 */
    }

}