/* CSS Reset and Base Styles */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

:root {
    --bg-primary: #0a0a0f;
    --bg-secondary: #13131a;
    --bg-tertiary: #1a1a24;
    --accent-primary: #6366f1;
    --accent-secondary: #8b5cf6;
    --accent-glow: rgba(99, 102, 241, 0.3);
    --text-primary: #f1f5f9;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;
    --border-color: #2d2d3a;
    --success: #22c55e;
    --warning: #f59e0b;
    --error: #ef4444;
    --step-active: #6366f1;
    --step-inactive: #1e1e2a;
    --step-playing: #22c55e;
    --track-kick: #ef4444;
    --track-snare: #f59e0b;
    --track-hihat: #22c55e;
    --track-clap: #3b82f6;
    --track-tom: #8b5cf6;
    --track-rim: #ec4899;
    --track-cymbal: #14b8a6;
    --track-perc: #f97316;
}

html {
    font-size: 16px;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    min-height: 100vh;
    line-height: 1.5;
}

.app-container {
    min-height: 100vh;
    display: flex;
    flex-direction: column;
    max-width: 1400px;
    margin: 0 auto;
    padding: 1rem;
}

/* Header */
header {
    text-align: center;
    padding: 1.5rem 0;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 1.5rem;
}

header h1 {
    font-size: 2rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: 0.25rem;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

/* Main Content */
main {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

/* Controls Section */
.controls-section {
    display: flex;
    flex-wrap: wrap;
    gap: 1.5rem;
    padding: 1rem;
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
}

.control-group {
    flex: 1;
    min-width: 150px;
}

.control-group label {
    display: block;
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-bottom: 0.5rem;
}

.control-group input[type="range"] {
    width: 100%;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-tertiary);
    border-radius: 3px;
    cursor: pointer;
}

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 18px;
    height: 18px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 10px var(--accent-glow);
}

.control-group input[type="range"]::-moz-range-thumb {
    width: 18px;
    height: 18px;
    background: var(--accent-primary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 10px var(--accent-glow);
}

.control-group select {
    width: 100%;
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.9rem;
    cursor: pointer;
}

.control-group select:focus {
    outline: none;
    border-color: var(--accent-primary);
}

/* Transport Controls */
.transport-controls {
    display: flex;
    justify-content: center;
    gap: 1rem;
    padding: 1rem;
}

.transport-btn {
    width: 60px;
    height: 60px;
    border-radius: 50%;
    border: 2px solid var(--accent-primary);
    background: var(--bg-secondary);
    color: var(--accent-primary);
    font-size: 1.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    justify-content: center;
}

.transport-btn:hover {
    background: var(--accent-primary);
    color: white;
    box-shadow: 0 0 20px var(--accent-glow);
}

.transport-btn.playing {
    background: var(--accent-primary);
    color: white;
}

.transport-btn.playing .play-icon {
    display: none;
}

.transport-btn.playing::after {
    content: '❚❚';
    font-size: 1rem;
}

.transport-btn.secondary {
    width: auto;
    padding: 0 1.5rem;
    border-radius: 30px;
    font-size: 0.9rem;
}

/* Sequencer Section */
.sequencer-section {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 1rem;
    overflow-x: auto;
}

.sequencer-header {
    display: flex;
    align-items: center;
    padding-bottom: 0.5rem;
    border-bottom: 1px solid var(--border-color);
    margin-bottom: 0.5rem;
    min-width: fit-content;
}

.track-label-header {
    width: 80px;
    flex-shrink: 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-transform: uppercase;
}

.steps-header {
    display: flex;
    flex: 1;
    gap: 4px;
}

.steps-header span {
    width: 36px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.7rem;
    color: var(--text-muted);
}

.steps-header span:nth-child(4n+1) {
    color: var(--text-secondary);
    font-weight: 600;
}

.track-controls-header {
    width: 60px;
    flex-shrink: 0;
    font-size: 0.75rem;
    color: var(--text-muted);
    text-align: center;
    text-transform: uppercase;
}

.sequencer {
    display: flex;
    flex-direction: column;
    gap: 4px;
    min-width: fit-content;
}

.track {
    display: flex;
    align-items: center;
    gap: 4px;
}

.track-label {
    width: 80px;
    flex-shrink: 0;
    font-size: 0.85rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.track-color {
    width: 8px;
    height: 8px;
    border-radius: 50%;
}

.steps {
    display: flex;
    gap: 4px;
    flex: 1;
}

.step {
    width: 36px;
    height: 36px;
    border-radius: 4px;
    background: var(--step-inactive);
    border: 1px solid var(--border-color);
    cursor: pointer;
    transition: all 0.1s ease;
}

.step:hover {
    border-color: var(--accent-primary);
    transform: scale(1.05);
}

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

.step.playing {
    border-color: var(--step-playing);
    box-shadow: 0 0 15px rgba(34, 197, 94, 0.5);
}

.step:nth-child(4n+1) {
    border-left: 2px solid var(--border-color);
}

.track-controls {
    width: 60px;
    flex-shrink: 0;
    display: flex;
    justify-content: center;
}

.track-volume {
    width: 50px;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: var(--bg-tertiary);
    border-radius: 3px;
    cursor: pointer;
}

.track-volume::-webkit-slider-thumb {
    -webkit-appearance: none;
    width: 12px;
    height: 12px;
    background: var(--text-secondary);
    border-radius: 50%;
    cursor: pointer;
}

.track-volume::-moz-range-thumb {
    width: 12px;
    height: 12px;
    background: var(--text-secondary);
    border-radius: 50%;
    cursor: pointer;
    border: none;
}

/* Pattern Section */
.pattern-section {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 1rem;
}

.pattern-section h2 {
    font-size: 1rem;
    color: var(--text-secondary);
    margin-bottom: 1rem;
}

.pattern-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
    justify-content: space-between;
}

.pattern-buttons {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.pattern-slot {
    width: 40px;
    height: 40px;
    border-radius: 8px;
    border: 2px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
}

.pattern-slot:hover {
    border-color: var(--accent-primary);
}

.pattern-slot.active {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.pattern-slot.has-data {
    border-color: var(--accent-secondary);
}

.pattern-actions {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.action-btn {
    padding: 0.5rem 1rem;
    border-radius: 6px;
    border: 1px solid var(--border-color);
    background: var(--bg-tertiary);
    color: var(--text-secondary);
    font-size: 0.85rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.action-btn:hover {
    border-color: var(--accent-primary);
    color: var(--text-primary);
}

.action-btn.primary {
    background: var(--accent-primary);
    border-color: var(--accent-primary);
    color: white;
}

.action-btn.primary:hover {
    background: var(--accent-secondary);
    border-color: var(--accent-secondary);
}

/* Export Section */
.export-section {
    background: var(--bg-secondary);
    border-radius: 12px;
    border: 1px solid var(--border-color);
    padding: 1rem;
}

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

.export-controls {
    display: flex;
    flex-wrap: wrap;
    gap: 1rem;
    align-items: center;
}

.export-options {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.export-options label {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.export-options select {
    padding: 0.5rem;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 6px;
    color: var(--text-primary);
    font-size: 0.85rem;
}

.export-btn {
    padding: 0.75rem 1.5rem;
    border-radius: 8px;
    border: none;
    background: linear-gradient(135deg, var(--accent-primary), var(--accent-secondary));
    color: white;
    font-size: 0.9rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.export-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 20px var(--accent-glow);
}

.export-btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
    transform: none;
}

.export-status {
    margin-top: 0.75rem;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.export-status.success {
    color: var(--success);
}

.export-status.error {
    color: var(--error);
}

/* Footer */
footer {
    text-align: center;
    padding: 1.5rem;
    margin-top: 2rem;
    border-top: 1px solid var(--border-color);
}

footer a {
    color: var(--text-secondary);
    text-decoration: none;
    font-size: 0.85rem;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--accent-primary);
}

/* Responsive Design */
@media (max-width: 768px) {
    html {
        font-size: 14px;
    }

    .app-container {
        padding: 0.5rem;
    }

    header {
        padding: 1rem 0;
    }

    header h1 {
        font-size: 1.5rem;
    }

    .controls-section {
        gap: 1rem;
    }

    .control-group {
        min-width: 100%;
    }

    .transport-btn {
        width: 50px;
        height: 50px;
    }

    .sequencer-section {
        padding: 0.75rem;
    }

    .track-label-header,
    .track-label {
        width: 60px;
        font-size: 0.75rem;
    }

    .step {
        width: 28px;
        height: 28px;
    }

    .steps-header span {
        width: 28px;
        font-size: 0.6rem;
    }

    .track-controls-header,
    .track-controls {
        width: 50px;
    }

    .pattern-controls {
        flex-direction: column;
        align-items: flex-start;
    }

    .pattern-slot {
        width: 36px;
        height: 36px;
    }

    .export-controls {
        flex-direction: column;
        align-items: flex-start;
    }
}

@media (max-width: 480px) {
    .step {
        width: 24px;
        height: 24px;
    }

    .steps-header span {
        width: 24px;
    }

    .track-label-header,
    .track-label {
        width: 50px;
        font-size: 0.7rem;
    }

    .track-color {
        display: none;
    }
}

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

.step.active.playing {
    animation: pulse 0.1s ease;
}

/* Scrollbar Styling */
::-webkit-scrollbar {
    width: 8px;
    height: 8px;
}

::-webkit-scrollbar-track {
    background: var(--bg-primary);
}

::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 4px;
}

::-webkit-scrollbar-thumb:hover {
    background: var(--text-muted);
}