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

:root {
    --primary-color: #ff6b6b;
    --secondary-color: #4ecdc4;
    --accent-color: #ffe66d;
    --bg-color: #1a1a2e;
    --surface-color: #16213e;
    --text-color: #eee;
    --step-size: 40px;
    --gap: 4px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-color);
    min-height: 100vh;
    display: flex;
    flex-direction: column;
}

header {
    text-align: center;
    padding: 2rem;
    background-color: var(--surface-color);
    border-bottom: 2px solid var(--primary-color);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    background: linear-gradient(45deg, var(--primary-color), var(--secondary-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    opacity: 0.8;
    font-size: 1.1rem;
}

main {
    flex: 1;
    padding: 2rem;
    max-width: 1200px;
    margin: 0 auto;
    width: 100%;
}

.controls {
    display: flex;
    gap: 1rem;
    align-items: center;
    margin-bottom: 2rem;
    flex-wrap: wrap;
    padding: 1.5rem;
    background-color: var(--surface-color);
    border-radius: 12px;
}

button {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    cursor: pointer;
    transition: all 0.3s ease;
    background-color: #333;
    color: white;
}

button:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(0,0,0,0.3);
}

.primary-btn {
    background-color: var(--primary-color);
    font-weight: bold;
}

#stop-btn {
    background-color: #666;
}

#clear-btn {
    background-color: #555;
}

.tempo-control {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-left: auto;
}

.tempo-control input[type="range"] {
    width: 150px;
    accent-color: var(--secondary-color);
}

.pattern-select {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.pattern-select select {
    padding: 0.5rem;
    border-radius: 6px;
    background-color: #333;
    color: white;
    border: 1px solid #555;
    font-size: 1rem;
}

.pattern-grid {
    background-color: var(--surface-color);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    overflow-x: auto;
}

.grid-header {
    display: flex;
    margin-bottom: 1rem;
}

.track-label {
    width: 100px;
    font-weight: bold;
    display: flex;
    align-items: center;
}

.beat-numbers {
    display: flex;
    gap: var(--gap);
    margin-left: var(--gap);
}

.beat-number {
    width: var(--step-size);
    height: 30px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.9rem;
    opacity: 0.6;
}

.beat-number.downbeat {
    opacity: 1;
    font-weight: bold;
    color: var(--accent-color);
}

.tracks {
    display: flex;
    flex-direction: column;
    gap: var(--gap);
}

.track {
    display: flex;
    align-items: center;
}

.track-steps {
    display: flex;
    gap: var(--gap);
    margin-left: var(--gap);
}

.step {
    width: var(--step-size);
    height: var(--step-size);
    padding: 0;
    background-color: #2a2a3e;
    border: 2px solid transparent;
    border-radius: 6px;
    cursor: pointer;
    transition: all 0.1s ease;
}

.step:hover {
    background-color: #3a3a4e;
    transform: scale(1.05);
}

.step.active {
    background-color: var(--primary-color);
    box-shadow: 0 0 10px var(--primary-color);
}

.step.downbeat {
    background-color: #333347;
}

.step.playing {
    border-color: var(--accent-color);
    animation: pulse 0.3s ease;
}

@keyframes pulse {
    0% { transform: scale(1); }
    50% { transform: scale(1.1); }
    100% { transform: scale(1); }
}

.track[data-sound="hihat"] .step.active {
    background-color: var(--secondary-color);
    box-shadow: 0 0 10px var(--secondary-color);
}

.track[data-sound="snare"] .step.active {
    background-color: var(--accent-color);
    box-shadow: 0 0 10px var(--accent-color);
}

.export-section {
    background-color: var(--surface-color);
    padding: 1.5rem;
    border-radius: 12px;
}

.export-section h2 {
    margin-bottom: 1rem;
    color: var(--secondary-color);
}

.export-section button {
    margin-right: 1rem;
    margin-bottom: 1rem;
}

#pattern-code {
    width: 100%;
    min-height: 150px;
    padding: 1rem;
    background-color: #0a0a0f;
    color: #00ff00;
    border: 1px solid #333;
    border-radius: 6px;
    font-family: 'Courier New', monospace;
    resize: vertical;
}

footer {
    text-align: center;
    padding: 1rem;
    background-color: var(--surface-color);
    border-top: 1px solid #333;
    opacity: 0.7;
}

@media (max-width: 768px) {
    :root {
        --step-size: 30px;
    }
    
    header h1 {
        font-size: 2rem;
    }
    
    .controls {
        justify-content: center;
    }
    
    .tempo-control {
        margin-left: 0;
        width: 100%;
        justify-content: center;
    }
    
    .track-label {
        width: 80px;
        font-size: 0.9rem;
    }
}