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

html, body {
    width: 100%;
    height: 100%;
    overflow: hidden;
}

body {
    background-color: #000000;
    margin: 0;
    padding: 0;
    position: relative;
}

.image-container {
    width: 100vw;
    height: 100vh;
    display: flex;
    justify-content: center;
    align-items: center;
    background-color: #000000;
    overflow: hidden;
}

.desktop-image,
.mobile-image {
    height: 100%;
    object-fit: contain;
    display: block;
}

/* 웹에서는 데스크톱 이미지만 표시 */
.desktop-image {
    display: block;
}

.mobile-image {
    display: none;
}

/* 모바일에서는 모바일 이미지만 표시 */
@media (max-width: 768px) {
    .desktop-image {
        display: none;
    }
    
    .mobile-image {
        display: block;
    }
}

/* 무료 회원가입 버튼 */
.btn-signup {
    position: fixed;
    bottom: 30px;
    left: 50%;
    transform: translateX(-50%);
    background-color: #FF69B4;
    color: #ffffff;
    border: none;
    padding: 18px 60px;
    font-size: 20px;
    font-weight: bold;
    border-radius: 30px;
    cursor: pointer;
    transition: background-color 0.3s, transform 0.2s;
    z-index: 1000;
    box-shadow: 0 4px 15px rgba(255, 105, 180, 0.4);
}

.btn-signup:hover {
    background-color: #FF1493;
    transform: translateX(-50%) scale(1.05);
}

.btn-signup:active {
    transform: translateX(-50%) scale(0.98);
}

/* 모바일 버튼 스타일 */
@media (max-width: 768px) {
    .btn-signup {
        bottom: 20px;
        padding: 16px 50px;
        font-size: 18px;
        width: calc(100% - 40px);
        max-width: 300px;
        border-radius: 25px;
    }
}

/* 작은 모바일 기기 (480px 이하) */
@media (max-width: 480px) {
    .btn-signup {
        bottom: 15px;
        padding: 14px 40px;
        font-size: 16px;
        width: calc(100% - 30px);
        max-width: 280px;
    }
}