/* 容器 */
.captcha-wrapper {
    width: 360px;
    position: relative;
    padding: 15px;
    border: 1px solid #ddd;
    background: #fff;
    border-radius: 8px;
    user-select: none;
}

.canvas-area {
    position: relative;
    width: 320px;
    height: 160px;
}

#mainCanvas {
    background: #eee;
    border-radius: 4px;
}

#pieceCanvas {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 10;
}

/* 滑动条轨道 */
.slider-track {
    height: 40px;
    background: #f7f9fa;
    border: 1px solid #e4e7eb;
    margin-top: 15px;
    position: relative;
    border-radius: 20px;
    overflow: hidden;
}

.slider-text {
    text-align: center;
    line-height: 40px;
    font-size: 14px;
    color: #88949d;
}

/* 滑块按钮 */
.slider-btn {
    width: 40px;
    height: 40px;
    background: #fff;
    box-shadow: 0 0 3px rgba(0,0,0,0.3);
    position: absolute;
    left: 0;
    top: 0;
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: background 0.2s;
    z-index: 11;
}

.slider-btn:hover {
    background: #1991fa;
    color: #fff;
}

/* 刷新按钮 */
.refresh-btn {
    margin-top: 10px;
    font-size: 13px;
    color: #1991fa;
    cursor: pointer;
    border: none;
    background: none;
    padding: 0;
}