:root{
    --brand:#00bcf2;
    --brand-dark:#0095c4;
    --brand-deep:#006b8f;
    --ink:#1e2a32;
    --ink-2:#5b6b76;
    --line:#e6edf1;
    --bg:#f4f8fa;
}
*{box-sizing:border-box}
html,body{height:100%;margin:0}
body{
    font-family:"PingFang SC","Microsoft YaHei","Helvetica Neue",Arial,sans-serif;
    color:var(--ink);
    background:var(--bg);
}
.layout{display:flex;min-height:100vh}

/* ===== 左侧品牌区 ===== */
.brand{
    flex:0 0 42%;
    position:relative;
    overflow:hidden;
    display:flex;flex-direction:column;justify-content:center;
    padding:48px 6%;
    color:#fff;
    background:linear-gradient(135deg,var(--brand-deep) 0%,var(--brand-dark) 45%,var(--brand) 100%);
}
.brand::before,.brand::after{
    content:"";position:absolute;border-radius:50%;
    background:rgba(255,255,255,.08);
}
.brand::before{width:440px;height:440px;top:-150px;right:-130px}
.brand::after{width:320px;height:320px;bottom:-120px;left:-100px}
.brand-logo{
    width:64px;height:64px;border-radius:16px;background:rgba(255,255,255,.16);
    display:flex;align-items:center;justify-content:center;
    font-weight:700;font-size:22px;letter-spacing:1px;
    margin-bottom:32px;backdrop-filter:blur(4px);
}
.brand h1{font-size:32px;margin:0 0 12px;font-weight:700;letter-spacing:1px}
.brand .sub{font-size:14px;opacity:.85;letter-spacing:3px;text-transform:uppercase;margin:0 0 36px}
.brand ul{list-style:none;margin:0;padding:0}
.brand li{display:flex;align-items:center;gap:10px;font-size:15px;opacity:.92;margin-bottom:16px}
.brand li .bi{font-size:18px;opacity:.9}
.brand-foot{position:absolute;bottom:28px;left:6%;font-size:12px;opacity:.6;letter-spacing:1px}

/* ===== 右侧登录区 ===== */
.main{
    flex:1 1 auto;
    display:flex;align-items:center;justify-content:center;
    padding:48px 24px;position:relative;
}
.panel{
    width:100%;max-width:520px;
    background:#fff;
    border:1px solid var(--line);
    border-radius:18px;
    box-shadow:0 14px 44px rgba(0,107,143,.10);
    padding:44px 48px;
}

.panel h2{font-size:22px;margin:0 0 6px;font-weight:700}
.panel .hint{font-size:13px;color:var(--ink-2);margin:0 0 26px}

.field{margin-bottom:18px}
.field label{display:block;font-size:13px;color:var(--ink-2);margin-bottom:6px}
.input-wrap{position:relative}
.input-wrap .bi{
    position:absolute;left:12px;top:50%;transform:translateY(-50%);
    color:#9fb0ba;font-size:16px;pointer-events:none;
}
.input-wrap input{
    width:100%;height:46px;border:1px solid var(--line);border-radius:10px;
    padding:0 44px 0 40px;font-size:15px;color:var(--ink);
    background:#fff;outline:none;transition:border-color .2s,box-shadow .2s;
    font-family:inherit;
}
.input-wrap input:focus{
    border-color:var(--brand);
    box-shadow:0 0 0 3px rgba(0,188,242,.15);
}
.input-wrap input::placeholder{color:#b6c4cc}

.row-between{display:flex;align-items:center;justify-content:space-between;margin:4px 0 20px;font-size:14px}
.remember{display:flex;align-items:center;gap:8px;color:var(--ink-2);cursor:pointer;user-select:none}
.remember input{width:16px;height:16px;accent-color:var(--brand);cursor:pointer}


.btn-login{
    width:100%;height:48px;border:0;border-radius:10px;cursor:pointer;
    background:linear-gradient(135deg,var(--brand-dark),var(--brand));
    color:#fff;font-size:16px;font-weight:600;letter-spacing:4px;
    box-shadow:0 6px 16px rgba(0,188,242,.35);
    transition:transform .15s,box-shadow .15s;font-family:inherit;
}
.btn-login:hover{transform:translateY(-1px);box-shadow:0 8px 20px rgba(0,188,242,.42)}
.btn-login:active{transform:none}

.main{padding-bottom:64px}

/* ===== 响应式 ===== */
@media (max-width:900px){
    .layout{flex-direction:column}
    .brand{flex:none;padding:36px 24px;text-align:center}
    .brand::before{width:260px;height:260px;top:-100px;right:-80px}
    .brand::after{display:none}
    .brand-logo{margin:0 auto 16px}
    .brand ul{display:none}
    .brand .sub{margin-bottom:0}
    .brand-foot{display:none}
    .main{padding:32px 20px 72px}
    .panel{padding:36px 28px}
}