:root {
    --vivid-pink: #FF007A;
    --vivid-blue: #00F0FF;
    --vivid-purple: #BC00FF;
    --vivid-yellow: #FFD600;
    --dark: #0A0A0C;
    --light: #FFFFFF;
}

body {
    background-color: var(--dark);
    color: var(--light);
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    min-height: 100vh;
    overflow-x: hidden;
}

.login-container {
    min-height: 100vh;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem 1rem;
    position: relative;
    width: 100%;
}

.login-glass {
    background: rgba(255, 255, 255, 0.02);
    backdrop-filter: blur(20px);
    border: 1px solid rgba(255, 255, 255, 0.08);
    border-radius: 3rem;
    padding: 4rem;
    width: 100%;
    max-width: 500px;
    position: relative;
    z-index: 10;
    text-align: center;
}

.login-logo {
    width: 64px;
    height: 64px;
    background: var(--vivid-pink);
    border-radius: 1.5rem;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 2rem;
    font-weight: 900;
    margin: 0 auto 2rem;
    box-shadow: 0 0 30px rgba(255, 0, 122, 0.4);
}

.login-title {
    font-size: 2.5rem;
    font-weight: 900;
    letter-spacing: -0.05em;
    margin-bottom: 1rem;
}

.login-subtitle {
    color: rgba(255, 255, 255, 0.4);
    margin-bottom: 3rem;
    line-height: 1.6;
}

.social-btns {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.social-btn {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    width: 100%;
    padding: 1.25rem;
    border-radius: 1.5rem;
    font-weight: 800;
    font-size: 1.125rem;
    transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
}

.social-btn:hover {
    transform: translateY(-4px);
}

.btn-kakao {
    background: #FEE500;
    color: #000;
}

.btn-google {
    background: #FFFFFF;
    color: #000;
}

.btn-naver {
    background: #03C75A;
    color: #FFFFFF;
}

.login-glow {
    position: absolute;
    width: 400px;
    height: 400px;
    background: radial-gradient(circle, var(--vivid-pink) 0%, transparent 70%);
    filter: blur(80px);
    opacity: 0.15;
    pointer-events: none;
    z-index: 1;
}

.glow-2 { bottom: -100px; left: -100px; background: radial-gradient(circle, var(--vivid-blue) 0%, transparent 70%); }

/* Mobile Optimization */
@media (max-width: 768px) {
    .login-container {
        padding: 3rem 1.5rem; /* 세로 중앙 정렬 상태에서 위아래 여백 확보 */
        align-items: center;  /* 기본적으로 중앙 정렬 유지 */
    }

    /* 화면 높이가 매우 작을 경우를 대비 */
    @media (max-height: 700px) {
        .login-container {
            align-items: flex-start; /* 높이가 작으면 위에서부터 배치하여 스크롤 유도 */
        }
    }

    .login-glass {
        padding: 3rem 1.5rem;
        border-radius: 2rem;
    }

    .login-logo {
        width: 56px;
        height: 56px;
        font-size: 1.5rem;
        margin-bottom: 1.5rem;
    }

    .login-title {
        font-size: 1.75rem;
        margin-bottom: 0.75rem;
    }

    .login-subtitle {
        font-size: 0.9375rem;
        margin-bottom: 2.5rem;
    }

    .social-btn {
        padding: 1rem;
        font-size: 1rem;
        border-radius: 1.25rem;
    }

    .login-glow {
        width: 300px;
        height: 300px;
        filter: blur(60px);
    }
}