body {
    background-color: #f8f9fa;
}
.login-container {
    max-width: 400px;
    margin-top: 100px;
}
.social-btn {
    width: 100%;
    margin-bottom: 10px;
}
.kakao {
    background-color: #FEE500;
    color: #000;
}
.btn.kakao:hover{
    background-color: #FEE500;
    filter: brightness(0.95);
}
.naver {
    background-color: #03C75A;
    color: #fff;
}
.btn.naver:hover {
    background-color: #03C75A;
    filter: brightness(0.95);
}
.google {
    background-color: #fff;
    border: 1px solid #ddd;
}
.btn.google:hover {
    background-color: #fff;
    filter: brightness(0.97);
}