/* Modern, beautiful styling for audio DSP application */

:root {
    /* Color Palette */
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #8b5cf6;
    --accent-color: #ec4899;
    --success-color: #10b981;
    --danger-color: #ef4444;
    
    /* Backgrounds */
    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-panel: rgba(30, 41, 59, 0.8);
    
    /* Text Colors */
    --text-primary: #f1f5f9;
    --text-secondary: #cbd5e1;
    --text-muted: #94a3b8;
    
    /* Spacing */
    --spacing-xs: 0.5rem;
    --spacing-sm: 0.75rem;
    --spacing-md: 1rem;
    --spacing-lg: 1.5rem;
    --spacing-xl: 2rem;
    
    /* Border Radius */
    --radius-sm: 0.375rem;
    --radius-md: 0.5rem;
    --radius-lg: 0.75rem;
    --radius-xl: 1rem;
    
    /* Shadows */
    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px rgba(0, 0, 0, 0.4);
    --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 20px rgba(99, 102, 241, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
    background: linear-gradient(135deg, var(--bg-primary) 0%, #1a1a2e 100%);
    color: var(--text-primary);
    line-height: 1.6;
    min-height: 100vh;
    padding: var(--spacing-lg);
}

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

/* Header Styling */
.header {
    text-align: center;
    margin-bottom: var(--spacing-xl);
    padding: var(--spacing-xl);
    background: var(--bg-panel);
    border-radius: var(--radius-xl);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
}

.header h1 {
    font-size: 2.5rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
    margin-bottom: var(--spacing-sm);
}

.subtitle {
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Content Grid */
.content-grid {
    display: grid;
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

/* Panel Styling */
.panel {
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    padding: var(--spacing-xl);
    box-shadow: var(--shadow-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.panel:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-lg), var(--shadow-glow);
}

.panel h2 {
    font-size: 1.75rem;
    margin-bottom: var(--spacing-sm);
    color: var(--text-primary);
}

.description {
    color: var(--text-muted);
    margin-bottom: var(--spacing-lg);
    font-size: 0.95rem;
}

/* Audio Controls */
.audio-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-md);
}

.effects-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
    gap: var(--spacing-lg);
    margin-bottom: var(--spacing-xl);
}

.control-section {
    background: var(--bg-secondary);
    padding: var(--spacing-lg);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.control-section h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Control Groups */
.control-group {
    margin-bottom: var(--spacing-lg);
    position: relative;
}

.control-group label {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: var(--spacing-xs);
}

.control-label {
    font-size: 0.9rem;
    color: var(--text-secondary);
    font-weight: 500;
}

.control-value {
    font-size: 0.9rem;
    color: var(--primary-color);
    font-weight: 700;
    font-family: 'Monaco', 'Courier New', monospace;
    min-width: 80px;
    text-align: right;
    display: inline-block;
}

/* Label Icons */
.label-icon {
    margin-right: var(--spacing-xs);
    font-size: 1.1rem;
}

/* Help Icons */
.help-icon {
    display: inline-block;
    width: 18px;
    height: 18px;
    line-height: 18px;
    text-align: center;
    border-radius: 50%;
    background: var(--primary-color);
    color: white;
    font-size: 0.7rem;
    font-weight: bold;
    margin-left: var(--spacing-xs);
    cursor: help;
    transition: transform 0.2s ease, background 0.2s ease;
}

.help-icon:hover {
    transform: scale(1.2);
    background: var(--secondary-color);
}

/* Control Hints */
.control-hint {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: var(--spacing-xs);
    font-style: italic;
}

/* Slider Styling */
.slider {
    width: 100%;
    height: 6px;
    border-radius: var(--radius-sm);
    background: var(--bg-tertiary);
    outline: none;
    -webkit-appearance: none;
    transition: background 0.2s ease;
}

.slider::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    cursor: pointer;
    box-shadow: var(--shadow-md);
    transition: transform 0.2s ease, box-shadow 0.2s ease;
}

.slider::-webkit-slider-thumb:hover {
    transform: scale(1.1);
    box-shadow: var(--shadow-md), 0 0 15px rgba(99, 102, 241, 0.5);
}

.slider::-moz-range-thumb {
    width: 20px;
    height: 20px;
    border-radius: 50%;
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    cursor: pointer;
    border: none;
    box-shadow: var(--shadow-md);
}

/* Button Styling */
.btn {
    padding: var(--spacing-sm) var(--spacing-lg);
    border: none;
    border-radius: var(--radius-md);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s ease;
    box-shadow: var(--shadow-sm);
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
}

.btn-large {
    padding: var(--spacing-md) var(--spacing-xl);
    font-size: 1.1rem;
}

.button-row {
    display: flex;
    gap: var(--spacing-md);
    flex-wrap: wrap;
}

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

.btn-primary:hover {
    transform: translateY(-2px);
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.4);
}

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.btn-secondary:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

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

.btn-danger {
    background: var(--danger-color);
    color: white;
}

.btn-danger:hover:not(:disabled) {
    background: #dc2626;
    transform: translateY(-2px);
}

/* Preset Buttons */
.preset-section {
    margin-top: var(--spacing-xl);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.preset-section h3 {
    margin-bottom: var(--spacing-md);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(140px, 1fr));
    gap: var(--spacing-sm);
}

.btn-preset {
    background: linear-gradient(135deg, var(--bg-tertiary), var(--bg-secondary));
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    padding: var(--spacing-md);
    font-size: 0.95rem;
    white-space: nowrap;
}

.btn-preset:hover {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    transform: translateY(-2px);
}

.btn-preset.active {
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    color: white;
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.5);
}

/* Effects Section */
.effects-section {
    margin-top: var(--spacing-lg);
}

.effects-section h3 {
    margin-bottom: var(--spacing-lg);
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

/* Status Display */
.status {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    font-size: 0.9rem;
    color: var(--text-secondary);
    text-align: center;
}

/* Number Input */
.number-input {
    width: 100%;
    padding: var(--spacing-sm);
    background: var(--bg-secondary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    border-radius: var(--radius-md);
    color: var(--text-primary);
    font-size: 1rem;
    font-family: 'Monaco', 'Courier New', monospace;
}

.number-input:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(99, 102, 241, 0.1);
}

/* Results Display */
.results {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.result-item {
    display: flex;
    justify-content: space-between;
    padding: var(--spacing-sm) 0;
    border-bottom: 1px solid rgba(255, 255, 255, 0.05);
}

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

.result-label {
    color: var(--text-secondary);
    font-weight: 500;
}

.result-value {
    color: var(--primary-color);
    font-weight: 700;
    font-family: 'Monaco', 'Courier New', monospace;
}

/* Wave Canvas */
#waveCanvas {
    width: 100%;
    max-width: 800px;
    height: 300px;
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    cursor: crosshair;
    box-shadow: var(--shadow-md);
    border: 1px solid rgba(255, 255, 255, 0.1);
    display: block;
    margin: var(--spacing-lg) auto;
}

.hint {
    text-align: center;
    color: var(--text-muted);
    font-size: 0.85rem;
    font-style: italic;
    margin-top: var(--spacing-sm);
}

.panel .hint {
    text-align: left;
}

/* Button Group */
.button-group {
    display: flex;
    flex-wrap: wrap;
    gap: var(--spacing-sm);
    margin-bottom: var(--spacing-lg);
}

/* Footer */
.footer {
    text-align: center;
    padding: var(--spacing-xl);
    background: var(--bg-panel);
    border-radius: var(--radius-lg);
    backdrop-filter: blur(10px);
    border: 1px solid rgba(255, 255, 255, 0.1);
}

.footer p {
    margin-bottom: var(--spacing-xs);
    color: var(--text-secondary);
}

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

/* Visualizer Styles */
.visualizer-panel {
    background: linear-gradient(135deg, rgba(30, 41, 59, 0.9), rgba(15, 23, 42, 0.9));
}

.visualizer-controls {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-lg);
}

.viz-buttons {
    display: flex;
    gap: var(--spacing-sm);
    flex-wrap: wrap;
    justify-content: center;
}

.btn-viz {
    padding: var(--spacing-sm) var(--spacing-lg);
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.1);
    font-size: 0.95rem;
}

.btn-viz:hover {
    background: var(--bg-secondary);
    transform: translateY(-2px);
}

.btn-viz.active {
    background: linear-gradient(135deg, var(--primary-color), var(--secondary-color));
    color: white;
    box-shadow: var(--shadow-md), 0 0 20px rgba(99, 102, 241, 0.4);
}

#visualizer {
    width: 100%;
    max-width: 800px;
    height: 300px;
    background: #0f172a;
    border-radius: var(--radius-md);
    box-shadow: var(--shadow-lg), inset 0 0 30px rgba(99, 102, 241, 0.1);
    border: 1px solid rgba(99, 102, 241, 0.2);
    display: block;
    margin: 0 auto;
}

.viz-stats {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: var(--spacing-md);
    padding: var(--spacing-lg);
    background: var(--bg-secondary);
    border-radius: var(--radius-md);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.stat-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: var(--spacing-sm);
}

.stat-label {
    color: var(--text-secondary);
    font-weight: 500;
    font-size: 0.9rem;
}

.stat-value {
    color: var(--primary-color);
    font-weight: 700;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 1.1rem;
}

/* Performance Monitor */
.performance-monitor {
    margin-top: var(--spacing-lg);
    padding: var(--spacing-lg);
    background: linear-gradient(135deg, rgba(15, 23, 42, 0.9), rgba(30, 41, 59, 0.9));
    border-radius: var(--radius-md);
    border: 1px solid rgba(99, 102, 241, 0.2);
}

.performance-monitor h4 {
    color: var(--text-primary);
    margin: 0 0 var(--spacing-md) 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.perf-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: var(--spacing-md);
}

.perf-item {
    display: flex;
    flex-direction: column;
    gap: var(--spacing-xs);
    padding: var(--spacing-sm);
    background: rgba(0, 0, 0, 0.2);
    border-radius: var(--radius-sm);
    border: 1px solid rgba(255, 255, 255, 0.05);
}

.perf-label {
    color: var(--text-secondary);
    font-size: 0.85rem;
    font-weight: 500;
}

.perf-value {
    color: #10b981;
    font-weight: 700;
    font-family: 'Monaco', 'Courier New', monospace;
    font-size: 1.2rem;
    text-shadow: 0 0 10px rgba(16, 185, 129, 0.3);
}

/* Responsive Design */
@media (max-width: 768px) {
    body {
        padding: var(--spacing-sm);
    }
    
    .header h1 {
        font-size: 1.75rem;
    }
    
    .panel {
        padding: var(--spacing-lg);
    }
    
    .button-group {
        flex-direction: column;
    }
    
    .btn {
        width: 100%;
        margin-right: 0;
    }
    
    .viz-buttons {
        flex-direction: column;
    }
    
    .btn-viz {
        width: 100%;
    }
}

/* Animations */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.5;
    }
}

.status.active {
    animation: pulse 2s ease-in-out infinite;
    color: var(--success-color);
}