:root {
    --bg-color: #282c34;
    --primary-panel-color: #3a4049;
    --secondary-panel-color: #40454f;
    --tertiary-panel-color: #2c313a;
    --border-color: #4f5864;
    --text-color: #abb2bf;
    --accent-color: #61afef;
    --accent-color-active: #c678dd;
    --slider-track-color: #21252b;
    --slider-thumb-color: var(--accent-color);
}

* {
    box-sizing: border-box;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Helvetica, Arial, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    margin: 0;
    padding: 1em;
    display: flex;
    justify-content: center;
    align-items: center;
    min-height: 100vh;
}

.synth-container {
    position: relative;
    display: flex;
    flex-direction: column;
    gap: 0.75em;
    background-color: var(--primary-panel-color);
    border: 1px solid var(--border-color);
    border-radius: 10px;
    padding: 1em;
    box-shadow: 0 4px 12px rgba(0,0,0,0.4);
    width: 100%;
    max-width: 1200px;
    overflow: hidden;
}

#oscilloscope {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    z-index: 1;
    opacity: 0.15;
    background-color: transparent;
    border: none;
}

.main-controls, .keyboard-container {
    position: relative;
    z-index: 2;
}

.main-controls {
    display: grid;
    grid-template-columns: 3fr 1fr;
    gap: 0.75em;
    align-items: start;
}

.global-controls {
    background-color: var(--secondary-panel-color);
    padding: 1em;
    border-radius: 5px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0 1em;
    align-content: start;
}

.oscillators-container {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.75em;
}

.oscillator {
    background-color: var(--secondary-panel-color);
    padding: 1em;
    border-radius: 5px;
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 0.5em 1em;
    align-content: start;
}

h2, h3 {
    margin-top: 0;
    font-weight: 400;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 0.5em;
    margin-bottom: 0.25em;
    text-align: center;
    width: 100%;
    grid-column: 1 / -1;
}

.oscillator .control-group {
    grid-column: 1 / -1;
}

.control-group {
    width: 100%;
}

.preset-group, .master-group, .voicing-group {
    grid-column: 1 / -1;
}

.slider-wrapper {
    position: relative;
    padding-top: 1em;
    margin-bottom: 0.75em;
}

.slider-wrapper label, .select-wrapper label, .control-group-inline label {
    font-size: 0.8em;
    color: var(--text-color-muted);
}

.slider-wrapper label {
    position: absolute;
    top: 0;
    left: 0;
}

.slider-value {
    position: absolute;
    top: 0;
    right: 0;
    font-size: 0.75em;
    background-color: var(--tertiary-panel-color);
    padding: 2px 5px;
    border-radius: 3px;
}

input[type="range"] {
    -webkit-appearance: none;
    appearance: none;
    width: 100%;
    height: 18px;
    background: transparent;
    outline: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-runnable-track {
    width: 100%;
    height: 4px;
    background: var(--slider-track-color);
    border-radius: 2px;
    border: 1px solid #111;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    margin-top: -7px;
    width: 14px;
    height: 18px;
    background: var(--slider-thumb-color);
    border-radius: 3px;
    border: 1px solid #111;
}

input[type="range"]::-moz-range-track {
    width: 100%;
    height: 4px;
    background: var(--slider-track-color);
    border-radius: 2px;
    border: 1px solid #111;
}

input[type="range"]::-moz-range-thumb {
    width: 14px;
    height: 18px;
    background: var(--slider-thumb-color);
    border-radius: 3px;
    border: 1px solid #111;
}

select, input[type="checkbox"] {
    width: 100%;
    padding: 8px;
    background-color: var(--tertiary-panel-color);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    border-radius: 4px;
}

.keyboard-container {
    padding: 0.75em 0;
    background: var(--tertiary-panel-color);
    border-radius: 5px;
    display: flex;
    justify-content: center;
}

.key {
    border: 1px solid #000;
    box-sizing: border-box;
    cursor: pointer;
    transition: background-color 0.1s;
}

.key.active {
    background-color: var(--accent-color-active);
}

.white {
    width: 38px;
    height: 140px;
    background-color: #abb2bf;
    z-index: 1;
}

.black {
    width: 22px;
    height: 90px;
    background-color: #3a4049;
    z-index: 2;
    margin-left: -11px;
    margin-right: -11px;
}

@media (max-width: 1024px) {
    .main-controls {
        grid-template-columns: 1fr;
    }
}