body, html {
    margin: 0;
    padding: 0;
    width: 100%;
    height: 100%;
    background-color: #efe8d8; 
    background-image: radial-gradient(circle at center, #f5f0e6 0%, #e3d5c0 100%);
    overflow: hidden;
    font-family: 'Noto Serif', serif;
    touch-action: none;
    user-select: none;
    -webkit-user-select: none;
    color: #2c1a12;
}

#canvas {
    display: block;
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    z-index: 1;
}

#ui {
    position: absolute;
    bottom: 0;
    left: 0;
    width: 100%;
    height: 28vh;
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: flex-start;
    z-index: 10;
    pointer-events: none;
}

.controls-container {
    pointer-events: auto;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.75rem;
    margin-top: 2rem;
    position: relative;
}

input[type=range] {
    -webkit-appearance: none;
    width: 320px;
    background: transparent;
}

input[type=range]:focus { outline: none; }

input[type=range]::-webkit-slider-runnable-track {
    width: 100%;
    height: 2px;
    cursor: pointer;
    background: rgba(44, 26, 18, 0.2);
    transition: background 0.3s;
}

input[type=range]:hover::-webkit-slider-runnable-track {
    background: rgba(44, 26, 18, 0.4);
}

input[type=range]::-webkit-slider-thumb {
    height: 16px;
    width: 6px;
    border-radius: 1px;
    background: #2c1a12;
    cursor: pointer;
    -webkit-appearance: none;
    margin-top: -7px;
    transition: all 0.2s ease;
}

input[type=range]:active::-webkit-slider-thumb {
    background: #a33222;
    transform: scaleY(1.3);
}

.bpm-display {
    display: flex;
    align-items: baseline;
    gap: 0.5rem;
}

.bpm-number {
    font-family: 'Poiret One', sans-serif;
    font-size: 5rem;
    font-weight: 400;
    letter-spacing: 0.05em;
    font-variant-numeric: tabular-nums;
    margin-bottom: -0.5rem;
}

.bpm-label {
    font-size: 0.85rem;
    font-style: italic;
    letter-spacing: 0.15em;
    opacity: 0.6;
}

.instruction, .notification {
    font-size: 0.8rem;
    letter-spacing: 0.2em;
    text-transform: uppercase;
    font-weight: 300;
    opacity: 0.5;
    transition: opacity 1s ease-in-out;
    position: absolute;
    top: -2.5rem;
    text-align: center;
    width: 100%;
}

.notification {
    color: #a33222;
    opacity: 0;
    pointer-events: none;
}

.btn-reset {
    background: transparent;
    border: 1px solid rgba(44, 26, 18, 0.3);
    color: #2c1a12;
    padding: 0.2rem 1.5rem;
    font-family: 'Poiret One', sans-serif;
    font-size: 1.5rem;
    letter-spacing: 0.1em;
    cursor: pointer;
    transition: all 0.3s ease;
    margin-top: 0.5rem;
    border-radius: 2px;
}

.btn-reset:hover {
    border-color: #2c1a12;
    background: rgba(44, 26, 18, 0.05);
}