.aj-captcha-overlay {
    display: none;
    position: fixed;
    top: 0; left: 0; right: 0; bottom: 0;
    background: rgba(0,0,0,0.5);
    z-index: 99999;
    align-items: center;
    justify-content: center;
}
.aj-captcha-box {
    background: #fff;
    border-radius: 8px;
    box-shadow: 0 4px 24px rgba(0,0,0,0.2);
    width: 340px;
    padding: 15px;
    position: relative;
    user-select: none;
}
.aj-captcha-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
    font-size: 15px;
    font-weight: 500;
    color: #333;
}
.aj-captcha-close {
    cursor: pointer;
    font-size: 22px;
    color: #999;
    line-height: 1;
}
.aj-captcha-close:hover { color: #333; }
.aj-captcha-img-wrap {
    position: relative;
    width: 310px;
    height: 155px;
    border-radius: 4px;
    overflow: hidden;
    background: #f0f0f0;
}
.aj-captcha-bg {
    width: 310px;
    height: 155px;
    display: block;
}
.aj-captcha-piece {
    position: absolute;
    top: 0;
    left: 0;
    height: auto;
    pointer-events: none;
}
.aj-captcha-slider {
    position: relative;
    height: 40px;
    margin-top: 12px;
    border-radius: 20px;
    background: #f5f5f5;
    border: 1px solid #e0e0e0;
}
.aj-captcha-slider-track {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 13px;
    color: #999;
}
.aj-captcha-slider-btn {
    position: absolute;
    top: -1px;
    left: 0;
    width: 44px;
    height: 40px;
    border-radius: 20px;
    background: #fff;
    border: 1px solid #ccc;
    box-shadow: 0 2px 6px rgba(0,0,0,0.1);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: box-shadow 0.2s;
}
.aj-captcha-slider-btn::after {
    content: '\276F';
    color: #666;
    font-size: 16px;
}
.aj-captcha-slider-btn:hover,
.aj-captcha-slider-btn.active {
    box-shadow: 0 2px 10px rgba(24,144,255,0.3);
    border-color: #1890ff;
}
.aj-captcha-msg {
    text-align: center;
    font-size: 13px;
    margin-top: 8px;
    min-height: 20px;
    color: #999;
}
.aj-captcha-msg.success { color: #52c41a; }
.aj-captcha-msg.fail { color: #f5222d; }
.aj-captcha-loading,
.aj-captcha-error {
    text-align: center;
    padding: 50px 0;
    color: #999;
    font-size: 14px;
}
.aj-captcha-error { color: #f5222d; }
.aj-captcha-hint {
    margin-top: 10px;
    font-size: 14px;
    color: #333;
    text-align: center;
}
.aj-captcha-hint strong { color: #1890ff; letter-spacing: 4px; }
.aj-captcha-click-wrap { cursor: crosshair; }
.aj-captcha-click-dots { position: absolute; top: 0; left: 0; right: 0; bottom: 0; }
.aj-captcha-dot {
    position: absolute;
    width: 24px;
    height: 24px;
    border-radius: 50%;
    background: #1890ff;
    color: #fff;
    font-size: 12px;
    display: flex;
    align-items: center;
    justify-content: center;
    box-shadow: 0 1px 4px rgba(0,0,0,0.3);
    pointer-events: none;
}