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

:root {
    --bg-primary: #0a0e27;
    --bg-secondary: #1a1f3a;
    --bg-tertiary: #2a2f4a;
    --text-primary: #e0e6ed;
    --text-secondary: #a0a6b0;
    --accent-green: #00ff88;
    --accent-cyan: #00d4ff;
    --accent-blue: #4a9eff;
    --accent-purple: #b44aff;
    --accent-red: #ff4a6a;
    --accent-orange: #ff9a4a;
    --accent-yellow: #ffcc4a;
    --glow-green: 0 0 10px rgba(0, 255, 136, 0.5);
    --glow-cyan: 0 0 10px rgba(0, 212, 255, 0.5);
    --border-color: rgba(0, 255, 136, 0.2);
}

body {
    font-family: 'Segoe UI', Tahoma, Geneva, Verdana, sans-serif;
    background: var(--bg-primary);
    color: var(--text-primary);
    line-height: 1.6;
    overflow-x: hidden;
}

.container {
    max-width: 1400px;
    margin: 0 auto;
    padding: 20px;
}

/* Header */
header {
    text-align: center;
    padding: 30px 20px;
    background: linear-gradient(135deg, var(--bg-secondary), var(--bg-tertiary));
    border-radius: 10px;
    margin-bottom: 30px;
    border: 1px solid var(--border-color);
    box-shadow: 0 4px 20px rgba(0, 255, 136, 0.1);
}

header h1 {
    font-size: 2.5em;
    color: var(--accent-green);
    text-shadow: var(--glow-green);
    margin-bottom: 10px;
}

.subtitle {
    font-size: 1.2em;
    color: var(--accent-cyan);
    margin-bottom: 20px;
}

.theory-box {
    background: rgba(0, 255, 136, 0.05);
    border: 1px solid var(--border-color);
    border-radius: 8px;
    padding: 15px 20px;
    margin-top: 20px;
    text-align: left;
}

.theory-box p {
    margin: 8px 0;
    font-size: 0.95em;
}

.theory-box strong {
    color: var(--accent-cyan);
}

/* Main Content */
main {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

/* Controls Section */
.controls-section {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 255, 136, 0.05);
}

.controls-section h2 {
    color: var(--accent-green);
    margin-bottom: 15px;
    font-size: 1.3em;
    border-bottom: 1px solid var(--border-color);
    padding-bottom: 8px;
}

.control-group {
    margin-bottom: 15px;
}

.control-group label {
    display: block;
    margin-bottom: 5px;
    color: var(--text-secondary);
    font-size: 0.9em;
}

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

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

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

.control-group select {
    width: 100%;
    padding: 8px 12px;
    background: var(--bg-tertiary);
    border: 1px solid var(--border-color);
    border-radius: 5px;
    color: var(--text-primary);
    font-size: 0.95em;
    cursor: pointer;
}

.control-group select:focus {
    outline: none;
    border-color: var(--accent-cyan);
    box-shadow: var(--glow-cyan);
}

.control-group input[type="checkbox"] {
    margin-right: 8px;
    cursor: pointer;
}

.control-group input[type="checkbox"]:checked {
    accent-color: var(--accent-green);
}

/* Harmonic Controls */
.harmonic-controls {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
    gap: 10px;
    margin-top: 15px;
}

.harmonic-control {
    background: var(--bg-tertiary);
    padding: 10px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
}

.harmonic-control h4 {
    color: var(--accent-cyan);
    font-size: 0.9em;
    margin-bottom: 8px;
}

.harmonic-control label {
    font-size: 0.8em;
}

/* Visualization Section */
.visualization-section {
    display: flex;
    flex-direction: column;
    gap: 30px;
}

.canvas-container {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 255, 136, 0.05);
}

.canvas-container h3 {
    color: var(--accent-green);
    margin-bottom: 10px;
    font-size: 1.1em;
}

.canvas-container canvas {
    width: 100%;
    height: auto;
    background: var(--bg-tertiary);
    border-radius: 5px;
    border: 1px solid var(--border-color);
    cursor: crosshair;
}

.canvas-hint {
    font-size: 0.85em;
    color: var(--text-secondary);
    margin-top: 8px;
    font-style: italic;
}

/* Statistics Section */
.stats-section {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 255, 136, 0.05);
}

.stats-section h2 {
    color: var(--accent-green);
    margin-bottom: 15px;
    font-size: 1.3em;
}

.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 15px;
}

.stat-item {
    background: var(--bg-tertiary);
    padding: 12px 15px;
    border-radius: 5px;
    border: 1px solid var(--border-color);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.stat-label {
    color: var(--text-secondary);
    font-size: 0.9em;
}

.stat-value {
    color: var(--accent-cyan);
    font-weight: bold;
    font-size: 1.1em;
}

/* Theory Section */
.theory-section {
    background: var(--bg-secondary);
    border-radius: 10px;
    padding: 20px;
    border: 1px solid var(--border-color);
    box-shadow: 0 2px 10px rgba(0, 255, 136, 0.05);
}

.theory-section h2 {
    color: var(--accent-green);
    margin-bottom: 15px;
    font-size: 1.3em;
}

.theory-content h3 {
    color: var(--accent-cyan);
    margin: 15px 0 10px;
    font-size: 1.1em;
}

.theory-content h4 {
    color: var(--accent-blue);
    margin: 12px 0 8px;
    font-size: 1em;
}

.theory-content p {
    color: var(--text-secondary);
    margin-bottom: 10px;
    line-height: 1.7;
}

.theory-content ul {
    margin-left: 20px;
    margin-bottom: 15px;
}

.theory-content li {
    color: var(--text-secondary);
    margin-bottom: 8px;
    line-height: 1.6;
}

.theory-content strong {
    color: var(--accent-green);
}

/* Footer */
footer {
    text-align: center;
    padding: 20px;
    color: var(--text-secondary);
    font-size: 0.9em;
    margin-top: 30px;
    border-top: 1px solid var(--border-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 1.8em;
    }

    .subtitle {
        font-size: 1em;
    }

    .stats-grid {
        grid-template-columns: 1fr;
    }

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

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.pulse {
    animation: pulse 2s ease-in-out infinite;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(10, 14, 39, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.loading-spinner {
    border: 4px solid var(--bg-tertiary);
    border-top: 4px solid var(--accent-green);
    border-radius: 50%;
    width: 50px;
    height: 50px;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    0% {
        transform: rotate(0deg);
    }
    100% {
        transform: rotate(360deg);
    }
}