/* ===== 后台登录页 ===== */
*{box-sizing:border-box;}

body{
    margin:0;
    min-height:100vh;
    font-family:-apple-system,BlinkMacSystemFont,"PingFang SC","Helvetica Neue","Microsoft YaHei",sans-serif;
    color:#16233f;
    background:radial-gradient(1200px 700px at 78% -10%,#22439f 0%,transparent 60%),
               radial-gradient(900px 600px at 8% 108%,#1a3a94 0%,transparent 55%),
               linear-gradient(160deg,#0a1430 0%,#101d44 48%,#0b1530 100%);
    background-attachment:fixed;
    overflow:hidden;
}

/* 科技网格 */
body::before{
    content:'';
    position:fixed;
    inset:0;
    background-image:linear-gradient(rgba(126,160,255,.06) 1px,transparent 1px),
                      linear-gradient(90deg,rgba(126,160,255,.06) 1px,transparent 1px);
    background-size:46px 46px;
    -webkit-mask-image:radial-gradient(ellipse at center,#000 30%,transparent 78%);
            mask-image:radial-gradient(ellipse at center,#000 30%,transparent 78%);
    pointer-events:none;
}

/* 浮动光晕 */
body::after{
    content:'';
    position:fixed;
    width:520px;height:520px;
    left:-160px;top:-160px;
    border-radius:50%;
    background:radial-gradient(circle,rgba(88,130,255,.32) 0%,transparent 70%);
    filter:blur(30px);
    animation:glowFloat 12s ease-in-out infinite alternate;
    pointer-events:none;
}

/* 登录卡片 */
.login{
    position:fixed;
    top:0;right:0;bottom:0;left:0;
    margin:auto;
    padding:44px 40px 36px;
    width:400px;
    max-width:calc(100vw - 40px);
    height:auto;
    border-radius:24px;
    background:rgba(255,255,255,.97);
    border:1px solid rgba(255,255,255,.7);
    box-shadow:0 30px 80px rgba(4,10,32,.55),
               0 2px 8px rgba(4,10,32,.2);
    z-index:1;
    animation:cardIn .55s cubic-bezier(.22,.8,.32,1) both;
}

/* 品牌区 */
.login-brand{
    display:flex;
    flex-direction:column;
    align-items:center;
    margin-bottom:28px;
}
.login-logo{
    width:62px;height:62px;
    border-radius:19px;
    display:flex;
    align-items:center;
    justify-content:center;
    background:linear-gradient(135deg,#5a86ff 0%,#3b63e8 100%);
    box-shadow:0 12px 24px rgba(64,102,235,.42),
               inset 0 1px 0 rgba(255,255,255,.28);
}
.login-logo i{color:#fff;font-size:27px;}
.login h1{
    margin:18px 0 7px;
    font-size:22px;
    font-weight:700;
    letter-spacing:3px;
    color:#16233f;
}
.login-sub{
    margin:0;
    font-size:13px;
    letter-spacing:.5px;
    color:#9aa3b5;
}

/* 表单项 */
.login .layui-form-item{
    position:relative;
    margin-bottom:17px;
}
.login .layui-form-item i{
    position:absolute;
    top:0;left:0;
    width:48px;
    color:#a4adc0;
    text-align:center;
    font-size:16px;
    line-height:48px;
    transition:color .2s;
    z-index:2;
}

/* 输入框 */
.login .layui-form-item .layui-input{
    width:100%;
    height:48px;
    padding:0 14px 0 48px;
    border:1px solid #e7eaf2;
    border-radius:12px;
    background-color:#f6f7fa;
    color:#1f2a44;
    font-size:14px;
    box-sizing:border-box;
    transition:border-color .2s,box-shadow .2s,background-color .2s;
}
.login .layui-form-item .layui-input-lg{height:48px;line-height:1.4;}
.login .layui-form-item .layui-input::placeholder{color:#adb4c4;}
.login .layui-form-item .layui-input:hover{border-color:#d4dae8;background-color:#fbfcfe;}
.login .layui-form-item .layui-input:focus{
    border-color:#4f7cff;
    background-color:#fff;
    box-shadow:0 0 0 4px rgba(79,124,255,.13);
    outline:none;
}
.login .layui-form-item:focus-within i{color:#4f7cff;}

/* 验证码 */
.login .captcha .layui-input{padding-right:128px;}
.login .captcha img{
    position:absolute;
    top:5px;right:5px;
    width:114px;height:38px;
    border-radius:9px;
    cursor:pointer;
    background:#fff;
}

/* 登录按钮 */
.login .layui-btn{
    position:relative;
    overflow:hidden;
    width:100%;
    height:48px;
    line-height:48px;
    margin-top:8px;
    padding:0;
    border:none;
    border-radius:12px;
    font-size:16px;
    font-weight:600;
    letter-spacing:8px;
    text-indent:8px;
    color:#fff;
    background:linear-gradient(135deg,#5a86ff 0%,#3b63e8 100%);
    box-shadow:0 10px 22px rgba(64,102,235,.38);
    transition:transform .15s,box-shadow .15s,filter .15s;
}
.login .layui-btn::after{
    content:'';
    position:absolute;
    top:0;left:-70%;
    width:45%;height:100%;
    background:linear-gradient(105deg,transparent,rgba(255,255,255,.35),transparent);
    transform:skewX(-18deg);
    transition:left .55s ease;
}
.login .layui-btn:hover{
    filter:brightness(1.06);
    transform:translateY(-1px);
    box-shadow:0 14px 28px rgba(64,102,235,.46);
}
.login .layui-btn:hover::after{left:125%;}
.login .layui-btn:active{transform:translateY(0);}

/* 底部备案 */
.login-footer{
    position:fixed;
    left:0;right:0;bottom:0;
    z-index:1;
    display:flex;
    justify-content:center;
    align-items:center;
    flex-wrap:wrap;
    gap:6px 30px;
    padding:18px 16px;
    font-size:13px;
}
.login-footer p{margin:0;}
.login-footer a{
    color:rgba(255,255,255,.62);
    text-decoration:none;
    letter-spacing:.4px;
    transition:color .2s;
}
.login-footer a:hover{color:#fff;}

@keyframes cardIn{
    from{opacity:0;transform:translateY(18px) scale(.985);}
    to{opacity:1;transform:translateY(0) scale(1);}
}
@keyframes glowFloat{
    from{transform:translate(0,0);}
    to{transform:translate(70px,50px);}
}