/* 限制页面内容宽度并居中 */
.main-content {
    max-width: 1200px;
    margin: 0 auto;
    padding: 0 20px;
    overflow-x: hidden;
}

.piano-window {
    background: transparent;
    border: none;
    padding: 20px 0;
    margin: 20px 0;
    text-align: center;
    overflow-x: auto;
    overflow-y: hidden;
}

.piano-window h4 {
    color: #4a7694;
    margin-bottom: 20px;
    font-size: 1.3rem;
    font-weight: 600;
    text-align: center;
    border-bottom: 2px solid #e9ecef;
    padding-bottom: 10px;
}

.piano-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 10px;
    margin-bottom: 20px;
}

.play-btn {
    background: #4a7694;
    color: white;
    border: none;
    padding: 12px 24px;
    border-radius: 6px;
    cursor: pointer;
    font-size: 14px;
    font-weight: 500;
    transition: all 0.3s ease;
    box-shadow: 0 2px 8px rgba(74, 118, 148, 0.2);
    position: relative;
    overflow: hidden;
}

.play-btn::before {
    content: '';
    position: absolute;
    top: 0;
    left: -100%;
    width: 100%;
    height: 100%;
    background: linear-gradient(90deg, transparent, rgba(255,255,255,0.2), transparent);
    transition: left 0.5s;
}

.play-btn:hover {
    background: #3a6684;
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(74, 118, 148, 0.3);
}

.play-btn:hover::before {
    left: 100%;
}

.play-btn:active {
    transform: translateY(0);
}

.play-btn.playing {
    background: #2c5aa0;
    box-shadow: 0 0 0 3px rgba(74, 118, 148, 0.3);
}

.piano-visual {
    background: #2c3e50;
    border-radius: 8px;
    padding: 15px;
    margin: 15px 0;
    color: white;
    font-family: 'Courier New', monospace;
}

.chord-notes {
    font-size: 16px;
    font-weight: bold;
    margin-bottom: 8px;
    color: #4a7694;
    background: #f8f9fa;
    padding: 8px 16px;
    border-radius: 20px;
    display: inline-block;
    border: 1px solid #e9ecef;
}

.chord-structure {
    font-size: 13px;
    color: #666;
    font-style: italic;
    margin-top: 5px;
}

.image-container {
    text-align: center;
    margin: 20px 0;
    overflow-x: auto;
}

.image-container img {
    max-width: 100%;
    max-height: 400px;
    height: auto;
    border-radius: 8px;
    box-shadow: 0 4px 15px rgba(0,0,0,0.1);
    display: block;
    margin: 0 auto;
}

/* 钢琴键盘样式 */
.piano-keyboard {
    background: transparent;
    border: none;
    padding: 15px 0;
    margin: 15px 0;
    color: #333;
    font-family: 'Arial', sans-serif;
    min-height: 120px;
    overflow-x: auto;
    overflow-y: hidden;
    scrollbar-width: thin;
    scrollbar-color: #4a7694 #f1f1f1;
}

.piano-keyboard::-webkit-scrollbar {
    height: 6px;
}

.piano-keyboard::-webkit-scrollbar-track {
    background: #f1f1f1;
    border-radius: 3px;
}

.piano-keyboard::-webkit-scrollbar-thumb {
    background: #4a7694;
    border-radius: 3px;
}

.piano-keyboard::-webkit-scrollbar-thumb:hover {
    background: #3a6684;
}

.keyboard-keys {
    display: flex;
    justify-content: center;
    gap: 2px;
    margin-bottom: 10px;
    min-width: fit-content;
    padding: 0 10px;
    flex-wrap: nowrap;
}

.piano-key {
    background: #ffffff;
    color: #333;
    border: 2px solid #ddd;
    border-radius: 0 0 6px 6px;
    padding: 45px 8px 12px;
    font-size: 12px;
    font-weight: bold;
    text-align: center;
    cursor: pointer;
    transition: all 0.2s ease;
    min-width: 35px;
    height: 100px;
    box-shadow: 0 2px 4px rgba(0,0,0,0.1);
    position: relative;
}

.piano-key:hover {
    background: #f8f8f8;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.15);
}

.piano-key.active {
    background: #2c5aa0;
    color: white;
    transform: translateY(2px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.1);
}

.piano-key.black {
    background: #2c2c2c;
    color: white;
    position: relative;
    z-index: 2;
    margin: 0 -12px;
    padding: 30px 6px 12px;
    min-width: 22px;
    height: 65px;
    border: 2px solid #1a1a1a;
    border-radius: 0 0 4px 4px;
}

.piano-key.black:hover {
    background: #3a3a3a;
    transform: translateY(-1px);
    box-shadow: 0 4px 8px rgba(0,0,0,0.3);
}

.piano-key.black.active {
    background: #1a3a5c;
    color: white;
    transform: translateY(2px);
    box-shadow: 0 1px 2px rgba(0,0,0,0.2);
}

/* 响应式设计 */
@media (max-width: 768px) {
    .main-content {
        padding: 0 15px;
    }
    
    .piano-window {
        padding: 15px 0;
        margin: 15px 0;
    }
    
    .piano-window h4 {
        font-size: 1.1rem;
        margin-bottom: 15px;
    }
    
    .piano-keyboard {
        padding: 10px 0;
        margin: 10px 0;
    }
    
    .keyboard-keys {
        padding: 0 5px;
        gap: 1px;
    }
    
    .piano-key {
        min-width: 24px;
        height: 70px;
        padding: 30px 4px 8px;
        font-size: 10px;
    }
    
    .piano-key.black {
        min-width: 14px;
        height: 45px;
        padding: 20px 3px 6px;
        margin: 0 -7px;
    }
    
    .play-btn {
        padding: 10px 20px;
        font-size: 13px;
    }
    
    .chord-notes {
        font-size: 14px;
        padding: 6px 12px;
    }
    
    .image-container {
        margin: 15px 0;
    }
    
    .image-container img {
        max-height: 300px;
    }
}

@media (max-width: 480px) {
    .main-content {
        padding: 0 10px;
    }
    
    .piano-window {
        padding: 10px 0;
        margin: 10px 0;
    }
    
    .piano-window h4 {
        font-size: 1rem;
        margin-bottom: 10px;
    }
    
    .piano-keyboard {
        padding: 8px 0;
        margin: 8px 0;
    }
    
    .keyboard-keys {
        padding: 0 3px;
        gap: 0.5px;
    }
    
    .piano-key {
        min-width: 20px;
        height: 60px;
        padding: 25px 3px 6px;
        font-size: 9px;
    }
    
    .piano-key.black {
        min-width: 12px;
        height: 38px;
        padding: 15px 2px 5px;
        margin: 0 -6px;
    }
    
    .play-btn {
        padding: 8px 16px;
        font-size: 12px;
    }
    
    .chord-notes {
        font-size: 12px;
        padding: 4px 8px;
    }
    
    .chord-structure {
        font-size: 11px;
    }
    
    .image-container {
        margin: 10px 0;
    }
    
    .image-container img {
        max-height: 250px;
    }
}

@media (max-width: 360px) {
    .main-content {
        padding: 0 5px;
    }
    
    .piano-window {
        padding: 8px 0;
        margin: 8px 0;
    }
    
    .piano-window h4 {
        font-size: 0.9rem;
        margin-bottom: 8px;
    }
    
    .piano-keyboard {
        padding: 5px 0;
        margin: 5px 0;
    }
    
    .keyboard-keys {
        padding: 0 2px;
        gap: 0px;
    }
    
    .piano-key {
        min-width: 18px;
        height: 55px;
        padding: 22px 2px 5px;
        font-size: 8px;
    }
    
    .piano-key.black {
        min-width: 10px;
        height: 35px;
        padding: 12px 1px 4px;
        margin: 0 -5px;
    }
    
    .play-btn {
        padding: 6px 12px;
        font-size: 11px;
    }
    
    .chord-notes {
        font-size: 11px;
        padding: 3px 6px;
    }
    
    .chord-structure {
        font-size: 10px;
    }
    
    .image-container {
        margin: 8px 0;
    }
    
    .image-container img {
        max-height: 200px;
    }
}