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

body {
    min-height: 100vh;
    background: linear-gradient(135deg,
            #0f172a 0%,
            #1e293b 50%,
            #334155 100%);
    font-family: Arial, Helvetica, sans-serif;
}

.login-container {
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    padding: 20px;
}

.login-card {
    width: 100%;
    max-width: 420px;
    background: #ffffff;
    border-radius: 20px;
    padding: 35px;
    box-shadow:
        0 20px 40px rgba(0, 0, 0, .20);
}

.login-title {
    text-align: center;
    font-size: 2rem;
    font-weight: 700;
    color: #0f172a;
    margin-bottom: 8px;
}

.login-subtitle {
    text-align: center;
    color: #64748b;
    margin-bottom: 30px;
}

.form-label {
    font-weight: 600;
    color: #334155;
}

.form-control {
    height: 50px;
    border-radius: 12px;
    border: 1px solid #cbd5e1;
}

.form-control:focus {
    border-color: #2563eb;
    box-shadow: 0 0 0 .15rem rgba(37, 99, 235, .20);
}

.btn-login {
    height: 50px;
    border: none;
    border-radius: 12px;
    background: #2563eb;
    color: white;
    font-size: 16px;
    font-weight: 600;
    transition: .3s;
}

.btn-login:hover {
    background: #1d4ed8;
    color: white;
    transform: translateY(-2px);
}

.alert {
    border-radius: 12px;
}

@media (max-width:768px) {

    .login-card {
        max-width: 100%;
        padding: 30px 25px;
    }

    .login-title {
        font-size: 1.8rem;
    }
}

@media (max-width:480px) {

    .login-card {
        padding: 25px 20px;
        border-radius: 16px;
    }

    .login-title {
        font-size: 1.6rem;
    }

    .form-control {
        height: 46px;
    }

    .btn-login {
        height: 46px;
    }
}