.assistant-button {
    position: fixed;
    right: 0;
    top: 40%;
    transform: translateY(-50%);
    background: #ed5338;
    width: 32px;
    height: 170px;
    z-index: 9999;
    border-radius: 8px 0 0 8px;
    box-shadow: -2px 2px 10px rgba(0, 0, 0, 0.72);
    cursor: pointer;
    overflow: hidden;
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 7px;
    transition: all 0.2s ease;
}
.assistant-button a {
    color: white;
    font-size: 14px;
    text-decoration: none;
    font-weight: bold;
    writing-mode: vertical-rl;
    text-orientation: mixed;
    transform: rotate(180deg);
    line-height: 1;
    text-align: center;
    font-family: Arial, sans-serif;
    transition: all 0.2s ease;
}