/* ================================================================
   Piano Keyboard Styles
   ================================================================ */

.piano-keyboard {
    position: relative;
    display: flex;
    height: 120px;
    margin: 0 auto;
    user-select: none;
}

.piano-key {
    position: relative;
    cursor: pointer;
    transition: all 0.15s ease;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-end;
    padding-bottom: 8px;
    font-size: 0.65rem;
    font-family: var(--font-mono);
    font-weight: 500;
}

.piano-key.white {
    width: 44px;
    height: 120px;
    background: linear-gradient(180deg, #f8f8f8 0%, #e8e8e8 100%);
    border: 1px solid #c0c0c0;
    border-radius: 0 0 5px 5px;
    z-index: 1;
    color: #555;
}

.piano-key.white:hover {
    background: linear-gradient(180deg, #fff 0%, #f0f0f0 100%);
}

.piano-key.black {
    width: 28px;
    height: 78px;
    background: linear-gradient(180deg, #333 0%, #111 100%);
    border: 1px solid #000;
    border-radius: 0 0 4px 4px;
    margin-left: -14px;
    margin-right: -14px;
    z-index: 2;
    color: #999;
    font-size: 0.58rem;
}

.piano-key.black:hover {
    background: linear-gradient(180deg, #444 0%, #222 100%);
}

/* Active / highlighted states */
.piano-key.active.white,
.piano-key.highlighted.white {
    background: linear-gradient(180deg, #b8b0ff 0%, #9388ff 100%);
    border-color: #7b6fff;
    color: #fff;
    box-shadow: 0 2px 12px rgba(108, 99, 255, 0.4);
}

.piano-key.active.black,
.piano-key.highlighted.black {
    background: linear-gradient(180deg, #6c63ff 0%, #4a42cc 100%);
    border-color: #5b52ee;
    color: #fff;
    box-shadow: 0 2px 12px rgba(108, 99, 255, 0.5);
}

.piano-key.root-key.white {
    background: linear-gradient(180deg, #ff9ec0 0%, #ff6b9d 100%);
    border-color: #ff5088;
    color: #fff;
    box-shadow: 0 2px 12px rgba(255, 107, 157, 0.4);
}

.piano-key.root-key.black {
    background: linear-gradient(180deg, #ff6b9d 0%, #cc5580 100%);
    border-color: #ff5088;
    color: #fff;
    box-shadow: 0 2px 12px rgba(255, 107, 157, 0.5);
}

.piano-key .key-label {
    pointer-events: none;
    opacity: 0;
    transition: opacity 0.2s;
}

.piano-key.active .key-label,
.piano-key.highlighted .key-label,
.piano-key.root-key .key-label,
.piano-key:hover .key-label {
    opacity: 1;
}

.piano-key .key-note-name {
    font-weight: 600;
    font-size: 0.72rem;
}

.piano-key .key-interval {
    font-size: 0.6rem;
    opacity: 0.8;
}

/* Play button under piano */
.piano-play-btn {
    display: block;
    margin: 0.75rem auto 0;
    padding: 0.4rem 1.2rem;
}