.captcha-box {
    width: 320px;
    background: #fff;
    border-radius: 12px;
    box-shadow: 0 4px 20px rgba(0,0,0,0.1);
    overflow: hidden;
    user-select: none;
    -webkit-user-select: none;
    margin: 0 auto;
    margin-top: 50px;
}

.captcha-image-area {
    position: relative;
    width: 320px;
    height: 160px;
    overflow: hidden;
    background: #eee;
}
.captcha-image-area canvas {
    display: block;
}

.puzzle-piece {
    position: absolute;
    top: 0;
    left: 0;
    z-index: 2;
}

.slider-area {
    position: relative;
    height: 44px;
    background: #e8e8e8;
    border-radius: 0 0 12px 12px;
}
.slider-track {
    position: absolute;
    top: 6px;
    left: 6px;
    right: 6px;
    height: 32px;
    background: #d5d5d5;
    border-radius: 16px;
    overflow: hidden;
}
.slider-fill {
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    width: 0;
    background: linear-gradient(90deg, #4CAF50, #66BB6A);
    border-radius: 16px;
}
.slider-thumb {
    position: absolute;
    top: 6px;
    left: 6px;
    width: 44px;
    height: 32px;
    background: #fff;
    border-radius: 16px;
    box-shadow: 0 2px 6px rgba(0,0,0,0.2);
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: grab;
    z-index: 3;
}
.slider-thumb:active { cursor: grabbing; }
.slider-thumb svg {
    width: 20px;
    height: 20px;
    fill: #999;
}
.slider-text {
    position: absolute;
    top: 0;
    left: 0;
    right: 0;
    height: 44px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 14px;
    color: #999;
    pointer-events: none;
}

.refresh-btn {
    position: absolute;
    top: 8px;
    right: 8px;
    width: 28px;
    height: 28px;
    background: rgba(0,0,0,0.5);
    border: none;
    border-radius: 50%;
    color: #fff;
    font-size: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    z-index: 5;
}

.status-tip {
    text-align: center;
    padding: 8px;
    font-size: 13px;
    color: #999;
}
.status-tip.success { color: #4CAF50; }
.status-tip.fail { color: #f44336; }