/* 화면 전환 */
.screen {display: none;
    width: 100%;
    height: 100vh;
    position: absolute;
    top: 0;
    left: 0;}

.screen.active {display: flex;
    justify-content: center;
    align-items: center;}

/* 메인 화면 */
.main-container {text-align: center;
    animation: fadeIn 0.5s ease-in;}

.title {font-size: 4rem;
    font-weight: bold;
    text-transform: uppercase;
    letter-spacing: 0.5rem;
    color: var(--main-color);
    text-shadow: 
        0 0 10px var(--main-color),
        0 0 20px var(--main-color),
        0 0 30px var(--main-color);
    margin-bottom: 3rem;
    animation: glow 2s ease-in-out infinite alternate;
}

@keyframes glow {
    from {
        text-shadow: 
            0 0 10px var(--main-color),
            0 0 20px var(--main-color),
            0 0 30px var(--main-color);
    }
    to {
        text-shadow: 
            0 0 20px var(--main-color),
            0 0 30px var(--main-color),
            0 0 40px var(--main-color),
            0 0 50px var(--main-color);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

/* 버튼 스타일 */
.long-btn {
    background-color: transparent;
    border: 2px solid var(--main-color);
    color: var(--main-color);
    padding: 1rem 3rem;
    font-size: 1.2rem;
    font-family: 'Galmuri14';
    text-transform: uppercase;
    letter-spacing: 0.2rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 10px rgba(0, 255, 65, 0.3);
    position: relative;
    overflow: hidden;
}

.long-btn:hover {
    background-color: var(--main-color);
    color: #000000;
    box-shadow: 
        0 0 20px rgba(0, 255, 65, 0.6),
        inset 0 0 20px rgba(0, 255, 65, 0.2);
    transform: translateY(-2px);
}

.long-btn:active {
    transform: translateY(0);
}

.short-btn,
#back-to-main-btn.short-btn {
    background-color: transparent;
    border: 2px solid var(--main-color);
    color: var(--main-color);
    padding: 0.8rem 2rem;
    font-size: 1rem;
    font-family: 'Galmuri14';
    text-transform: uppercase;
    letter-spacing: 0.1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    box-shadow: 0 0 5px rgba(0, 255, 65, 0.2);
    margin-top: 1rem;
    width: 120px;
}

.short-btn:hover {background-color: rgba(0, 255, 65, 0.1);
    box-shadow: 0 0 15px rgba(0, 255, 65, 0.4);}