/* CSS Variables for theming */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --background-color: #0f0f1a;
    --surface-color: #1a1a2e;
    --surface-hover: #252542;
    --text-color: #e2e8f0;
    --text-muted: #94a3b8;
    --border-color: #334155;
    --accent-color: #22d3ee;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;
    --gradient-start: #6366f1;
    --gradient-end: #8b5cf6;
}

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

html {
    font-size: 16px;
    scroll-behavior: smooth;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, sans-serif;
    background: var(--background-color);
    color: var(--text-color);
    line-height: 1.6;
    min-height: 100vh;
}

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

/* Header */
header {
    text-align: center;
    padding: 2rem 1rem;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    border-radius: 1rem;
    margin-bottom: 1.5rem;
}

header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    text-shadow: 0 2px 4px rgba(0, 0, 0, 0.3);
}

.subtitle {
    color: rgba(255, 255, 255, 0.9);
    font-size: 1.1rem;
}

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

/* Sections */
section {
    background: var(--surface-color);
    border-radius: 1rem;
    padding: 1.5rem;
    border: 1px solid var(--border-color);
}

section h2 {
    font-size: 1.25rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

/* Input Section - Tabs */
.input-tabs {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1.5rem;
    flex-wrap: wrap;
}

.tab-btn {
    flex: 1;
    min-width: 100px;
    padding: 0.75rem 1rem;
    border: none;
    background: var(--surface-hover);
    color: var(--text-muted);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    font-weight: 500;
    transition: all 0.2s ease;
}

.tab-btn:hover {
    background: var(--border-color);
    color: var(--text-color);
}

.tab-btn.active {
    background: var(--primary-color);
    color: white;
}

.tab-content {
    display: none;
}

.tab-content.active {
    display: block;
    animation: fadeIn 0.3s ease;
}

@keyframes fadeIn {
    from { opacity: 0; transform: translateY(-10px); }
    to { opacity: 1; transform: translateY(0); }
}

/* Audio Controls */
.audio-controls,
.midi-controls {
    display: flex;
    gap: 1rem;
    flex-wrap: wrap;
    justify-content: center;
}

.audio-player-container {
    margin-top: 1rem;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

#audio-player {
    width: 100%;
    max-width: 400px;
}

/* Buttons */
.primary-btn,
.secondary-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: 0.5rem;
    font-size: 1rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
}

.primary-btn {
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 4px 12px rgba(99, 102, 241, 0.4);
}

.primary-btn:active {
    transform: translateY(0);
}

.primary-btn.recording {
    background: linear-gradient(135deg, var(--error-color), #dc2626);
    animation: pulse 1.5s infinite;
}

@keyframes pulse {
    0%, 100% { box-shadow: 0 0 0 0 rgba(239, 68, 68, 0.4); }
    50% { box-shadow: 0 0 0 10px rgba(239, 68, 68, 0); }
}

.secondary-btn {
    background: var(--surface-hover);
    color: var(--text-color);
    border: 1px solid var(--border-color);
}

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

.icon {
    font-size: 1.2rem;
}

/* Status Text */
.status-text {
    text-align: center;
    color: var(--text-muted);
    margin-top: 1rem;
    font-size: 0.9rem;
}

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

/* MIDI Notes Display */
.midi-notes-display {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    margin-top: 1rem;
    justify-content: center;
    min-height: 40px;
}

.midi-note {
    background: var(--primary-color);
    color: white;
    padding: 0.25rem 0.75rem;
    border-radius: 1rem;
    font-size: 0.85rem;
    animation: noteIn 0.2s ease;
}

@keyframes noteIn {
    from { transform: scale(0); }
    to { transform: scale(1); }
}

/* Tap Button */
.tap-controls {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
}

.tap-button {
    width: 150px;
    height: 150px;
    border-radius: 50%;
    border: none;
    background: linear-gradient(135deg, var(--gradient-start), var(--gradient-end));
    color: white;
    font-size: 1.5rem;
    font-weight: 700;
    cursor: pointer;
    transition: all 0.1s ease;
    box-shadow: 0 4px 20px rgba(99, 102, 241, 0.4);
}

.tap-button:hover {
    transform: scale(1.05);
}

.tap-button:active,
.tap-button.tapped {
    transform: scale(0.95);
    box-shadow: 0 2px 10px rgba(99, 102, 241, 0.3);
}

.tap-instruction {
    color: var(--text-muted);
    font-size: 0.9rem;
}

.tap-actions {
    display: flex;
    gap: 1rem;
}

/* Visualization Section */
.viz-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    flex-wrap: wrap;
    gap: 1rem;
    margin-bottom: 1rem;
}

.viz-style-selector {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.viz-style-selector label {
    color: var(--text-muted);
}

.viz-style-selector select,
#time-signature,
#loop-bars {
    background: var(--surface-hover);
    color: var(--text-color);
    border: 1px solid var(--border-color);
    padding: 0.5rem 1rem;
    border-radius: 0.5rem;
    font-size: 0.9rem;
    cursor: pointer;
}

.canvas-container {
    background: var(--background-color);
    border-radius: 0.75rem;
    overflow: hidden;
    position: relative;
}

#visualizer {
    width: 100%;
    height: 300px;
    display: block;
}

/* Beat Indicators */
.beat-indicators {
    display: flex;
    justify-content: center;
    gap: 1rem;
    margin-top: 1rem;
}

.beat-dot {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--surface-hover);
    border: 2px solid var(--border-color);
    transition: all 0.1s ease;
}

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

/* Controls Section */
.controls-section {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
    gap: 1.5rem;
}

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.control-group label {
    color: var(--text-muted);
    font-size: 0.9rem;
}

/* Range Slider */
input[type="range"] {
    width: 100%;
    height: 8px;
    border-radius: 4px;
    background: var(--surface-hover);
    appearance: none;
    cursor: pointer;
}

input[type="range"]::-webkit-slider-thumb {
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    transition: transform 0.1s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    transform: scale(1.2);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: var(--primary-color);
    cursor: pointer;
    border: none;
}

/* Tempo Presets */
.tempo-presets {
    display: flex;
    gap: 0.5rem;
    flex-wrap: wrap;
}

.preset-btn {
    padding: 0.4rem 0.8rem;
    border: 1px solid var(--border-color);
    background: var(--surface-hover);
    color: var(--text-muted);
    border-radius: 0.25rem;
    cursor: pointer;
    font-size: 0.85rem;
    transition: all 0.2s ease;
}

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

.preset-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
    color: white;
}

/* Loop Controls */
.loop-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.toggle-btn {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.5rem 1rem;
    border: 1px solid var(--border-color);
    background: var(--surface-hover);
    color: var(--text-muted);
    border-radius: 0.5rem;
    cursor: pointer;
    transition: all 0.2s ease;
}

.toggle-btn.active {
    background: var(--success-color);
    border-color: var(--success-color);
    color: white;
}

.loop-length {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.loop-length label {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Playback Controls */
.playback-controls {
    flex-direction: row !important;
    flex-wrap: wrap;
    justify-content: center;
}

.control-btn {
    padding: 0.75rem 1.25rem;
    border: 1px solid var(--border-color);
    background: var(--surface-hover);
    color: var(--text-color);
    border-radius: 0.5rem;
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.control-btn:hover {
    background: var(--border-color);
}

.control-btn.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

/* Pattern Section */
.pattern-display {
    background: var(--background-color);
    border-radius: 0.75rem;
    padding: 1.5rem;
    min-height: 100px;
    display: flex;
    align-items: center;
    justify-content: center;
}

.pattern-placeholder {
    color: var(--text-muted);
    text-align: center;
}

.pattern-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 0.5rem;
    justify-content: center;
    width: 100%;
}

.pattern-beat {
    width: 40px;
    height: 40px;
    border-radius: 0.5rem;
    background: var(--surface-hover);
    border: 2px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 0.8rem;
    transition: all 0.2s ease;
}

.pattern-beat.active {
    background: var(--primary-color);
    border-color: var(--primary-color);
}

.pattern-beat.current {
    box-shadow: 0 0 10px var(--accent-color);
    border-color: var(--accent-color);
}

.pattern-actions {
    display: flex;
    gap: 1rem;
    margin-top: 1rem;
    justify-content: center;
    flex-wrap: wrap;
}

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

footer p {
    color: var(--text-muted);
    font-size: 0.9rem;
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: color 0.2s ease;
}

footer a:hover {
    color: var(--secondary-color);
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    .app-container {
        padding: 0.75rem;
    }

    header {
        padding: 1.5rem 1rem;
    }

    header h1 {
        font-size: 1.75rem;
    }

    .subtitle {
        font-size: 0.95rem;
    }

    section {
        padding: 1rem;
    }

    .tap-button {
        width: 120px;
        height: 120px;
        font-size: 1.25rem;
    }

    #visualizer {
        height: 200px;
    }

    .controls-section {
        grid-template-columns: 1fr;
    }

    .pattern-beat {
        width: 32px;
        height: 32px;
    }
}

@media (max-width: 480px) {
    header h1 {
        font-size: 1.5rem;
    }

    .input-tabs {
        flex-direction: column;
    }

    .tab-btn {
        width: 100%;
    }

    .primary-btn,
    .secondary-btn {
        padding: 0.6rem 1rem;
        font-size: 0.9rem;
    }

    .beat-indicators {
        gap: 0.5rem;
    }

    .beat-dot {
        width: 16px;
        height: 16px;
    }
}

/* Utility Classes */
.hidden {
    display: none !important;
}

.fade-in {
    animation: fadeIn 0.3s ease;
}

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

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

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

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