custom.css

/* CSS Variables */
:root {
    /* Light mode */
    --background-color: #f5f5f5;
    --container-background: #fafafa;
    --key-background: white;
    --key-hover-background: #f5f5f5;
    --border-color: #e5e5e5;
    --text-primary: #333;
    --text-secondary: #666;
    --slider-track: #393a39;
    --slider-thumb: #000000;
    --button-background: #015131;
    --button-hover: #002114;
    --button-text: white;
    --keyboard-bg: #fafafa;
    --inactive-key-bg: #e0e0e0;
}

@media (prefers-color-scheme: dark) {
    :root {
        --background-color: #121212;
        --container-background: #1e1e1e;
        --key-background: #2d2d2d;
        --key-hover-background: #3d3d3d;
        --border-color: #404040;
        --text-primary: #e0e0e0;
        --text-secondary: #a0a0a0;
        --slider-track: #666666;
        --slider-thumb: #015131;
        --button-background: #015131;
        --button-hover: #026b41;
        --keyboard-bg: #1e1e1e;
        --inactive-key-bg: #2d2d2d;
    }
}

/* Base styles */
html, body, #root, .wrapper, main, .main-container {
    background-color: var(--background-color);
    min-height: 100vh;
    margin: 0;
    padding: 0;
    width: 100%;
    max-width: 100%;
}

body {
    font-family: 'Roboto', sans-serif;
    font-size: 1rem;
    line-height: 1.5;
    color: var(--text-primary);
    overflow-x: hidden;
    transition: background-color 0.2s ease;
}

/* Keyboard layout */
.keyboard-container {
    width: 100%;
    padding: 1.5rem;
    background: var(--keyboard-bg);
    border: 1px solid var(--border-color);
    border-radius: 4px;
    user-select: none;
}

.keyboard-row {
    display: flex;
    gap: 0.25rem;
    margin-bottom: 0.25rem;
    width: 100%;
}

/* Key styles */
.key {
    width: calc((100% - 2.75rem) / 12);
    aspect-ratio: 1;
    min-width: 40px;
    flex: none;
    padding: 0.5rem;
    border: 1px solid var(--border-color);
    border-radius: 4px;
    background: var(--key-background);
    cursor: pointer;
    transition: all 0.2s cubic-bezier(0.4, 0, 0.2, 1);
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
}

.key:hover {
    background: var(--key-hover-background);
    transform: translateY(-1px);
}

.key:active {
    transform: translateY(0);
}

.key.inactive,
.key:disabled {
    background: var(--inactive-key-bg);
}

.key-label {
    font-size: 0.875rem;
    font-weight: 500;
    color: var(--text-primary);
}

.note-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-top: 0.25rem;
}

/* Controls section */
.controls-section {
    margin: 1em 0;
    padding: 1em;
}

.controls-row {
    display: flex;
    gap: 1em;
    margin: 1em 0;
}

.control-group {
    margin: 1em 0;
}

.control-group.half-width {
    flex: 1;
    margin: 0;
}

/* Labels and values */
.slider-label,
h3 {
    display: block;
    margin-bottom: 0.5em;
    font-size: 0.9em;
    color: var(--text-primary);
}

h3 {
    margin-top: 0;
    font-size: 1rem;
    font-weight: 500;
}

.slider-value,
.master-value,
.release-value,
.reverb-mix-value,
.root-value,
.column-value,
.row-value {
    color: var(--text-secondary);
    font-weight: 500;
}

/* Range inputs */
input[type="range"] {
    width: 100%;
    height: 24px;
    background: transparent;
    border-radius: 2px;
    appearance: none;
    cursor: pointer;
    margin: 0.5em 0;
    padding: 10px 0;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 16px;
    height: 16px;
    background: var(--slider-thumb);
    border-radius: 50%;
    cursor: pointer;
    margin-top: -6px;
}

input[type="range"]::-webkit-slider-runnable-track {
    background: var(--slider-track);
    height: 4px;
    border-radius: 2px;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    background: var(--slider-thumb);
    border: none;
    border-radius: 50%;
    cursor: pointer;
}

input[type="range"]::-moz-range-track {
    background: var(--slider-track);
    height: 4px;
    border-radius: 2px;
}

/* Mobile styles */
@media (max-width: 768px) {
    .control-group {
        min-width: 100%;
    }
    
    .key {
        min-width: 35px;
    }
    
    .key-label {
        font-size: 0.75rem;
    }
    
    input[type="range"] {
        height: 32px;
        padding: 14px 0;
    }
    
    input[type="range"]::-webkit-slider-thumb {
        width: 28px;
        height: 28px;
    }
}