body { 
    font-family: 'Noto Sans KR', sans-serif; 
    background-color: #121212; 
    color: #e0e0e0; 
    margin: 0;
    padding: 0;
}

.glass-card { 
    background: rgba(30, 30, 30, 0.8); 
    backdrop-filter: blur(10px); 
    border: 1px solid rgba(255, 255, 255, 0.1); 
    border-radius: 1.5rem; 
}

.btn-option { 
    transition: all 0.1s ease; 
    border: 1px solid rgba(255, 255, 255, 0.1); 
    width: 100%;
    padding: 1.25rem;
    text-align: left;
    color: #e0e0e0;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 1rem;
    font-weight: 500;
    cursor: pointer;
    display: block;
}

.btn-option:hover { 
    background-color: rgba(255, 255, 255, 0.1); 
    transform: translateY(-2px); 
}

.btn-option:active { 
    transform: scale(0.96); 
    background-color: rgba(255, 255, 255, 0.15); 
}

.progress-fill { 
    transition: width 0.4s cubic-bezier(0.4, 0, 0.2, 1); 
}

.hidden {
    display: none;
}