/* AB 循环功能样式 */

.loop-button-group {
    display: inline-flex;
    align-items: center;
    margin-left: 15px;
    gap: 3px;
    background: rgba(0, 0, 0, 0.2);
    border-radius: 4px;
    padding: 2px 5px;
}

.loop-btn {
    min-width: 32px;
    height: 32px;
    padding: 4px 8px;
    font-size: 12px;
    font-weight: bold;
    border: 1px solid rgba(255, 255, 255, 0.2);
    background: rgba(50, 50, 50, 0.8);
    color: #ccc;
    border-radius: 3px;
    cursor: pointer;
    transition: all 0.2s ease;
}

.loop-btn:hover {
    background: rgba(80, 80, 80, 0.9);
    color: #fff;
}

/* A 按钮 */
.loop-btn-a {
    color: #4CAF50;
    border-color: #4CAF50;
}

.loop-btn-a:hover {
    background: rgba(76, 175, 80, 0.3);
}

.loop-btn-a.loop-point-set {
    background: #4CAF50;
    color: #fff;
    box-shadow: 0 0 8px rgba(76, 175, 80, 0.5);
}

/* B 按钮 */
.loop-btn-b {
    color: #FF9800;
    border-color: #FF9800;
}

.loop-btn-b:hover {
    background: rgba(255, 152, 0, 0.3);
}

.loop-btn-b.loop-point-set {
    background: #FF9800;
    color: #fff;
    box-shadow: 0 0 8px rgba(255, 152, 0, 0.5);
}

/* 循环开关按钮 */
.loop-btn-toggle {
    color: #2196F3;
    border-color: #2196F3;
}

.loop-btn-toggle:hover {
    background: rgba(33, 150, 243, 0.3);
}

.loop-btn-toggle.loop-active {
    background: #2196F3;
    color: #fff;
    box-shadow: 0 0 8px rgba(33, 150, 243, 0.5);
    animation: pulse-loop 1.5s infinite;
}

/* 清除按钮 */
.loop-btn-clear {
    color: #f44336;
    border-color: #f44336;
}

.loop-btn-clear:hover {
    background: rgba(244, 67, 54, 0.3);
}

/* 循环激活时的脉冲动画 */
@keyframes pulse-loop {
    0% {
        box-shadow: 0 0 5px rgba(33, 150, 243, 0.5);
    }
    50% {
        box-shadow: 0 0 15px rgba(33, 150, 243, 0.8);
    }
    100% {
        box-shadow: 0 0 5px rgba(33, 150, 243, 0.5);
    }
}

/* 进度条上的 A/B 标记 */
.loop-marker {
    position: absolute;
    top: 0;
    width: 3px;
    height: 100%;
    z-index: 10;
    pointer-events: none;
}

.loop-marker-a {
    background: #4CAF50;
    box-shadow: 0 0 5px #4CAF50;
}

.loop-marker-b {
    background: #FF9800;
    box-shadow: 0 0 5px #FF9800;
}

.loop-marker::after {
    content: attr(data-label);
    position: absolute;
    top: -18px;
    left: 50%;
    transform: translateX(-50%);
    font-size: 10px;
    font-weight: bold;
    color: inherit;
    background: rgba(0, 0, 0, 0.7);
    padding: 1px 4px;
    border-radius: 2px;
}

/* 循环区域高亮 */
.loop-region {
    position: absolute;
    top: 0;
    height: 100%;
    background: rgba(33, 150, 243, 0.2);
    border-left: 2px solid #4CAF50;
    border-right: 2px solid #FF9800;
    pointer-events: none;
    z-index: 5;
}

/* 响应式调整 */
@media (max-width: 768px) {
    .loop-button-group {
        margin-left: 8px;
        gap: 2px;
        padding: 2px 3px;
    }
    
    .loop-btn {
        min-width: 28px;
        height: 28px;
        padding: 3px 6px;
        font-size: 11px;
    }
}

/* ============= 节拍器按钮样式 ============= */

.metronome-btn {
    position: relative;
    transition: all 0.2s ease;
}

.metronome-btn::after {
    content: "";
    position: absolute;
    top: 2px;
    right: 2px;
    width: 6px;
    height: 6px;
    border-radius: 50%;
    background: transparent;
    transition: background 0.2s ease;
}

.metronome-btn.metronome-active {
    color: #4CAF50 !important;
    border-color: #4CAF50;
    background: rgba(76, 175, 80, 0.2);
}

.metronome-btn.metronome-active::after {
    background: #4CAF50;
    box-shadow: 0 0 4px #4CAF50;
    animation: metronome-pulse 0.5s infinite alternate;
}

.metronome-btn.metronome-active .glyphicon {
    color: #4CAF50;
}

@keyframes metronome-pulse {
    0% {
        opacity: 0.5;
        transform: scale(0.8);
    }
    100% {
        opacity: 1;
        transform: scale(1.2);
    }
}