* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    font-family: 'Courier New', monospace;
    background-color: #000;
    color: #fff;
    min-height: 100vh;
    padding: 1rem;
}

.container {
    max-width: 600px;
    margin: 0 auto;
}

header {
    text-align: center;
    margin-bottom: 1rem;
}

h1 {
    font-size: 1.5rem;
    letter-spacing: 0.2em;
    color: #fff;
    text-transform: uppercase;
    text-shadow: #00ffff 0px 0px 5px;
}

#visualizer {
    width: 100%;
    height: 200px;
    margin-bottom: 1rem;
    border: 1px solid #333;
    border-radius: 4px;
    overflow: hidden;
    background-color: #000;
    position: relative;
}

#visualCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

.app-container {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.track-tabs {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.track-tab {
    background-color: #000;
    color: #666;
    border: 2px solid #333;
    padding: 1rem;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    font-size: 1.2rem;
    font-weight: bold;
    text-transform: uppercase;
    transition: all 0.2s ease;
}

.track-tab:hover {
    border-color: #fff;
    color: #fff;
}

.track-tab.active {
    border-color: #00ffff;
    color: #00ffff;
    background-color: rgba(0, 255, 255, 0.1);
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.3);
}

.track-panel {
    border: 1px solid #333;
    border-radius: 4px;
    padding: 1rem;
    background-color: rgba(255, 255, 255, 0.02);
}

.track-sample-section {
    margin-bottom: 1rem;
}

.sample-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.current-sample {
    text-align: center;
    padding: 0.75rem;
    background-color: #000;
    border: 1px solid #333;
    border-radius: 4px;
    font-size: 0.9rem;
    color: #888;
}

.current-sample.loaded {
    color: #00ffff;
    border-color: #00ffff;
}

.track-controls {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.step-grid {
    display: grid;
    grid-template-columns: repeat(4, 1fr);
    gap: 0.5rem;
}

.step-row {
    display: contents;
}

.step {
    aspect-ratio: 1;
    background-color: #000;
    border: 2px solid #333;
    cursor: pointer;
    transition: all 0.1s ease;
    border-radius: 4px;
}

.step:hover {
    border-color: #fff;
    background-color: rgba(255, 255, 255, 0.1);
}

.step.active {
    background-color: #00ffff;
    border-color: #00ffff;
    box-shadow: 0 0 10px rgba(0, 255, 255, 0.5);
}

.step.current {
    outline: 3px solid #ff00ff;
    outline-offset: -3px;
}

.step.active.current {
    background-color: #ff00ff;
    border-color: #ff00ff;
    box-shadow: 0 0 15px rgba(255, 0, 255, 0.8);
}

.global-section {
    border: 1px solid #333;
    border-radius: 4px;
    padding: 1rem;
    background-color: rgba(255, 255, 255, 0.02);
}

.control-row {
    display: grid;
    grid-template-columns: 80px 1fr 60px;
    align-items: center;
    gap: 0.75rem;
    margin-bottom: 1rem;
}

.control-row label {
    color: #fff;
    text-transform: uppercase;
    font-size: 0.85rem;
    letter-spacing: 0.1em;
}

.control-row input[type="range"] {
    width: 100%;
}

.control-row span {
    color: #00ffff;
    text-align: right;
    font-size: 0.9rem;
}

.global-buttons {
    display: grid;
    grid-template-columns: 1fr 1fr 1fr;
    gap: 0.5rem;
}

.btn {
    background-color: #000;
    color: #fff;
    border: 2px solid #fff;
    padding: 0.75rem;
    cursor: pointer;
    font-family: 'Courier New', monospace;
    font-size: 0.9rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    transition: all 0.2s ease;
    border-radius: 4px;
}

.btn:hover {
    background-color: #fff;
    color: #000;
}

.btn:active {
    transform: scale(0.95);
}

.btn-primary {
    border-color: #00ffff;
    color: #00ffff;
}

.btn-primary:hover {
    background-color: #00ffff;
    color: #000;
}

.btn-secondary {
    border-color: #666;
    color: #666;
}

.btn-secondary:hover {
    background-color: #666;
    color: #000;
}

.btn-toggle {
    border-color: #ff00ff;
    color: #ff00ff;
}

.btn-toggle:hover {
    background-color: #ff00ff;
    color: #000;
}

.btn-toggle.active {
    background-color: #ff00ff;
    color: #000;
    box-shadow: 0 0 10px rgba(255, 0, 255, 0.5);
}

.btn-play {
    border-color: #00ffff;
    color: #00ffff;
}

.btn-play:hover {
    background-color: #00ffff;
    color: #000;
}

.btn-stop {
    border-color: #ff00ff;
    color: #ff00ff;
}

.btn-stop:hover {
    background-color: #ff00ff;
    color: #000;
}

.modal-overlay {
    position: fixed;
    top: 0;
    left: 0;
    right: 0;
    bottom: 0;
    background-color: rgba(0, 0, 0, 0.95);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 1rem;
}

.modal-content {
    background-color: #000;
    border: 2px solid #00ffff;
    border-radius: 8px;
    width: 100%;
    max-width: 400px;
    max-height: 90vh;
    display: flex;
    flex-direction: column;
}

.modal-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #333;
}

.modal-header h3 {
    margin: 0;
    font-size: 1rem;
    color: #00ffff;
    text-transform: uppercase;
    letter-spacing: 0.1em;
}

.modal-close {
    background: none;
    border: none;
    color: #fff;
    font-size: 2rem;
    cursor: pointer;
    padding: 0;
    line-height: 1;
    transition: color 0.2s ease;
}

.modal-close:hover {
    color: #ff00ff;
}

.modal-body {
    padding: 1rem;
    overflow-y: auto;
}

.modal-body .sample-list {
    max-height: 60vh;
    overflow-y: auto;
}

.sample-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 1rem;
    border-bottom: 1px solid #222;
    cursor: pointer;
    transition: all 0.2s ease;
}

.sample-item:last-child {
    border-bottom: none;
}

.sample-item:hover {
    background-color: rgba(0, 255, 255, 0.1);
}

.sample-name {
    color: #fff;
    font-size: 0.95rem;
}

.sample-ext {
    color: #ff00ff;
    font-size: 0.75rem;
    padding: 0.2rem 0.5rem;
    border: 1px solid #ff00ff;
    border-radius: 3px;
}

.empty-state {
    padding: 3rem 1rem;
    text-align: center;
    color: #666;
    font-size: 0.9rem;
}

@media (min-width: 768px) {
    h1 {
        font-size: 2rem;
    }

    .container {
        max-width: 800px;
    }

    #visualizer {
        height: 300px;
    }

    .step-grid {
        grid-template-columns: repeat(8, 1fr);
    }
}