:root{
    --primary:#2563eb;
    --primary-hover:#1d4ed8;
    --background:#f5f7fb;
    --card:#ffffff;
    --text:#1f2937;
    --muted:#6b7280;
    --border:#d1d5db;
}

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

body{
    background:var(--background);
    font-family:'Segoe UI',Tahoma,Geneva,Verdana,sans-serif;
    display:flex;
    justify-content:center;
    align-items:center;
    min-height:100vh;
}

.login-card{
    width:420px;
    max-width:95%;
    background:var(--card);
    border-radius:16px;
    box-shadow:0 15px 40px rgba(0,0,0,.08);
    padding:35px;
}

.logo{
    text-align:center;
    margin-bottom:25px;
}

.logo img{
    width:220px;
    height:auto;
}

.logo h2{
    font-size:24px;
    color:var(--text);
}

.logo p{
    color:var(--muted);
    margin-top:6px;
}

.form-group{
    margin-bottom:18px;
}

.form-group label{
    display:block;
    margin-bottom:6px;
    font-size:13px;
    font-weight:600;
}

.form-control{
    width:100%;
    height:46px;
    border:1px solid var(--border);
    border-radius:8px;
    padding:0 14px;
    font-size:14px;
}

.form-control:focus{
    outline:none;
    border-color:var(--primary);
}

.btn-login{
    width:100%;
    height:48px;
    border:none;
    border-radius:8px;
    background:var(--primary);
    color:#fff;
    font-size:15px;
    font-weight:600;
    cursor:pointer;
}

.btn-login:hover{
    background:var(--primary-hover);
}

.alert{
    padding:12px;
    border-radius:8px;
    margin-bottom:18px;
    font-size:13px;
}

.alert-success{
    background:#dcfce7;
    color:#166534;
}

.alert-danger{
    background:#fee2e2;
    color:#991b1b;
}

.footer{
    text-align:center;
    margin-top:25px;
    font-size:12px;
    color:#9ca3af;
}