/* Main Menu Styles */
#main-menu-screen {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(160deg, #2c3e50, #34495e);
    color: white;
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    z-index: 9999;
    transition: opacity 0.5s ease-in-out;
}

.main-menu-box {
    text-align: center;
    padding: 40px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 15px;
    box-shadow: 0 10px 30px rgba(0,0,0,0.4);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.main-menu-title {
    font-size: 32px;
    font-weight: bold;
    margin: 0;
    margin-bottom: 10px;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 15px;
}

.main-menu-subtitle {
    font-size: 14px;
    color: #bdc3c7;
    margin-bottom: 30px; /* [修改] 縮小與下方分隔線的間距 */
}

.main-menu-buttons {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 280px;
}

.main-menu-button {
    background: rgba(255, 255, 255, 0.1);
    border: 2px solid rgba(255, 255, 255, 0.5);
    color: #ecf0f1;
    padding: 15px 20px;
    border-radius: 10px;
    font-size: 18px;
    font-weight: bold;
    cursor: pointer;
    transition: all 0.2s ease-in-out;
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 10px;
}

.main-menu-button:hover {
    background: rgba(255, 255, 255, 0.2);
    border-color: #ffffff;
    transform: translateY(-2px);
}

.main-menu-button:active {
    transform: translateY(0);
}

.main-menu-button.disabled {
    background: rgba(0, 0, 0, 0.2);
    border-color: rgba(255, 255, 255, 0.1);
    color: #7f8c8d;
    cursor: not-allowed;
    transform: none;
}

.main-menu-footer {
    position: absolute;
    top: 20px;
    right: 20px;
    font-size: 13px;
    color: #bdc3c7;
    display: flex;
    align-items: center;
    gap: 12px;
}

.main-menu-footer-user {
    background: rgba(0, 0, 0, 0.3);
    padding: 8px 15px;
    border-radius: 20px;
}

.main-menu-footer a {
    color: #95a5a6;
    text-decoration: none;
    transition: color 0.2s;
    background: rgba(255, 99, 71, 0.2);
    padding: 8px 15px;
    border-radius: 20px;
}

.main-menu-footer a:hover {
    color: #ffffff;
    background: rgba(255, 99, 71, 0.4);
}

/* [新增] 分隔線與區塊小標題的樣式 */
.menu-divider {
    border: none;
    height: 1px;
    background-color: rgba(255, 255, 255, 0.2);
    margin: 0 0 20px 0;
}

.menu-section-title {
    font-size: 16px;
    font-weight: normal;
    color: #95a5a6;
    margin: 0 0 25px 0;
}