*{
    margin:0;
    padding:0;
    box-sizing:border-box;
    font-family:'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
}

body{
    min-height:100vh;
    display:flex;
    justify-content:center;
    align-items:center;
    background:linear-gradient(135deg,#0f172a,#1e293b,#334155);
}

.container{
    width:100%;
    padding:20px;
    display:flex;
    justify-content:center;
    align-items:center;
}

.card{
    width:100%;
    max-width:420px;
    background:#ffffff;
    padding:40px;
    border-radius:20px;
    box-shadow:0 15px 40px rgba(0,0,0,0.25);
    text-align:center;
    animation:fadeIn 0.5s ease;
}

.card h2{
    color:#0f172a;
    margin-bottom:10px;
    font-size:30px;
    font-weight:700;
}

.subtitle{
    color:#64748b;
    font-size:14px;
    margin-bottom:25px;
    line-height:1.6;
}

.input-group{
    margin-bottom:20px;
}

.input-group input{
    width:100%;
    padding:14px 16px;
    border:2px solid #e2e8f0;
    border-radius:10px;
    outline:none;
    font-size:15px;
    transition:0.3s;
}

.input-group input:focus{
    border-color:#2563eb;
    box-shadow:0 0 10px rgba(37,99,235,0.2);
}

button{
    width:100%;
    padding:14px;
    border:none;
    border-radius:10px;
    background:#2563eb;
    color:white;
    font-size:16px;
    font-weight:600;
    cursor:pointer;
    transition:0.3s;
}

button:hover{
    background:#1d4ed8;
    transform:translateY(-2px);
}

.alert{
    background:#fee2e2;
    color:#dc2626;
    padding:12px;
    border-radius:10px;
    margin-bottom:20px;
    font-size:14px;
}

.back-link{
    display:inline-block;
    margin-top:20px;
    text-decoration:none;
    color:#2563eb;
    font-weight:600;
    transition:0.3s;
}

.back-link:hover{
    color:#1d4ed8;
}

@keyframes fadeIn{
    from{
        opacity:0;
        transform:translateY(20px);
    }
    to{
        opacity:1;
        transform:translateY(0);
    }
}