/* Tone Generator - Styles */

:root {
    --primary-color: #00d9ff;
    --secondary-color: #0f3460;
    --background-dark: #1a1a2e;
    --background-light: #16213e;
    --text-color: #e8e8e8;
    --text-muted: #a0a0a0;
    --success-color: #2ecc71;
    --warning-color: #f39c12;
    --danger-color: #e74c3c;
    --border-radius: 8px;
    --box-shadow: 0 4px 6px rgba(0, 0, 0, 0.3);
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
    background: linear-gradient(135deg, var(--background-dark) 0%, var(--secondary-color) 100%);
    color: var(--text-color);
    min-height: 100vh;
    line-height: 1.6;
}

/* Header */
header {
    text-align: center;
    padding: 2rem 1rem 1rem;
    background: rgba(0, 0, 0, 0.3);
    border-bottom: 2px solid var(--primary-color);
}

header h1 {
    font-size: 2.5rem;
    margin-bottom: 0.5rem;
    color: var(--primary-color);
    text-shadow: 0 0 10px rgba(0, 217, 255, 0.5);
}

.subtitle {
    font-size: 1.1rem;
    color: var(--text-muted);
    font-weight: 300;
}

/* Main Content */
main {
    max-width: 1200px;
    margin: 0 auto;
    padding: 2rem 1rem;
}

/* Generator Container */
.generator-container {
    background: var(--background-light);
    border-radius: var(--border-radius);
    padding: 2rem;
    box-shadow: var(--box-shadow);
    margin-bottom: 3rem;
    border: 1px solid rgba(0, 217, 255, 0.2);
}

.control-panel {
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

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

.control-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.control-group label {
    font-weight: 600;
    color: var(--primary-color);
    font-size: 0.95rem;
}

.control-group small {
    color: var(--text-muted);
    font-size: 0.85rem;
}

/* Input Styles */
input[type="number"],
select {
    width: 100%;
    padding: 0.75rem;
    background: var(--background-dark);
    border: 2px solid var(--secondary-color);
    border-radius: var(--border-radius);
    color: var(--text-color);
    font-size: 1rem;
    transition: all 0.3s ease;
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary-color);
    box-shadow: 0 0 0 3px rgba(0, 217, 255, 0.1);
}

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

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    box-shadow: 0 0 5px rgba(0, 217, 255, 0.5);
    transition: all 0.3s ease;
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: #00f0ff;
    transform: scale(1.1);
}

input[type="range"]::-moz-range-thumb {
    width: 20px;
    height: 20px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    border: none;
    box-shadow: 0 0 5px rgba(0, 217, 255, 0.5);
}

/* Frequency Input Group */
.frequency-input-group {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.frequency-input-group input[type="number"] {
    text-align: center;
    font-size: 1.5rem;
    font-weight: bold;
    color: var(--primary-color);
}

/* Volume Control */
.volume-control {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#volumeValue {
    font-weight: bold;
    color: var(--primary-color);
    min-width: 50px;
    text-align: right;
}

/* Buttons */
.btn {
    padding: 0.75rem 1.5rem;
    border: none;
    border-radius: var(--border-radius);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.btn:disabled {
    opacity: 0.5;
    cursor: not-allowed;
}

.btn-primary {
    background: var(--primary-color);
    color: var(--background-dark);
}

.btn-primary:hover:not(:disabled) {
    background: #00f0ff;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(0, 217, 255, 0.4);
}

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

.btn-secondary:hover:not(:disabled) {
    background: #c0392b;
    transform: translateY(-2px);
    box-shadow: 0 4px 8px rgba(231, 76, 60, 0.4);
}

.btn-preset {
    background: var(--background-dark);
    color: var(--primary-color);
    border: 2px solid var(--primary-color);
    padding: 0.5rem 1rem;
    font-size: 0.9rem;
}

.btn-preset:hover {
    background: var(--primary-color);
    color: var(--background-dark);
    transform: translateY(-2px);
}

/* Play Controls */
.play-controls {
    display: flex;
    gap: 1rem;
    justify-content: center;
}

.play-controls .btn {
    flex: 1;
    max-width: 200px;
}

/* Status */
.status {
    text-align: center;
    padding: 1rem;
    background: var(--background-dark);
    border-radius: var(--border-radius);
    color: var(--primary-color);
    font-weight: 600;
    border: 2px solid var(--secondary-color);
}

/* Presets */
.presets h3 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.2rem;
}

.preset-buttons {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
    gap: 0.75rem;
}

/* Advanced Controls */
.advanced-controls {
    background: var(--background-dark);
    border-radius: var(--border-radius);
    padding: 1rem;
    border: 2px solid var(--secondary-color);
}

.advanced-controls summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    padding: 0.5rem;
    user-select: none;
}

.advanced-controls summary:hover {
    color: #00f0ff;
}

.advanced-content {
    margin-top: 1rem;
    padding-top: 1rem;
    border-top: 1px solid var(--secondary-color);
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

.advanced-controls input[type="checkbox"] {
    width: auto;
    margin-right: 0.5rem;
    cursor: pointer;
}

.advanced-controls label {
    display: flex;
    align-items: center;
    cursor: pointer;
}

/* Visualizer */
.visualizer-container {
    margin-top: 1.5rem;
}

#visualizer {
    width: 100%;
    height: 100px;
    border-radius: var(--border-radius);
    background: var(--background-dark);
    border: 2px solid var(--primary-color);
}

/* Info Section */
.info-section {
    display: flex;
    flex-direction: column;
    gap: 2rem;
}

.info-section article {
    background: var(--background-light);
    padding: 2rem;
    border-radius: var(--border-radius);
    box-shadow: var(--box-shadow);
    border: 1px solid rgba(0, 217, 255, 0.1);
}

.info-section h2 {
    color: var(--primary-color);
    margin-bottom: 1rem;
    font-size: 1.8rem;
}

.info-section p {
    margin-bottom: 1rem;
    color: var(--text-color);
}

.info-section ul {
    margin-left: 1.5rem;
    color: var(--text-color);
}

.info-section li {
    margin-bottom: 0.75rem;
}

.info-section li strong {
    color: var(--primary-color);
}

/* Waveform Info */
.waveform-info dt {
    color: var(--primary-color);
    margin-top: 1rem;
    margin-bottom: 0.5rem;
}

.waveform-info dd {
    margin-left: 1.5rem;
    margin-bottom: 1rem;
    color: var(--text-color);
}

/* Use Cases */
.use-cases li {
    margin-bottom: 1rem;
}

/* Shortcuts */
.shortcuts {
    list-style: none;
    margin-left: 0;
}

.shortcuts li {
    display: flex;
    align-items: center;
    gap: 1rem;
    margin-bottom: 0.75rem;
}

kbd {
    background: var(--background-dark);
    border: 2px solid var(--primary-color);
    border-radius: 4px;
    padding: 0.25rem 0.5rem;
    font-family: monospace;
    font-weight: bold;
    color: var(--primary-color);
    min-width: 60px;
    text-align: center;
    display: inline-block;
}

/* FAQ */
details {
    margin-bottom: 1rem;
    background: var(--background-dark);
    border-radius: var(--border-radius);
    padding: 1rem;
    border: 1px solid var(--secondary-color);
}

details summary {
    cursor: pointer;
    font-weight: 600;
    color: var(--primary-color);
    user-select: none;
}

details summary:hover {
    color: #00f0ff;
}

details p {
    margin-top: 1rem;
    margin-bottom: 0;
}

/* Footer */
footer {
    background: rgba(0, 0, 0, 0.3);
    border-top: 2px solid var(--primary-color);
    padding: 2rem 1rem;
    text-align: center;
    color: var(--text-muted);
}

footer a {
    color: var(--primary-color);
    text-decoration: none;
    transition: color 0.3s ease;
}

footer a:hover {
    color: #00f0ff;
    text-decoration: underline;
}

/* Responsive Design */
@media (max-width: 768px) {
    header h1 {
        font-size: 2rem;
    }

    .subtitle {
        font-size: 1rem;
    }

    .generator-container {
        padding: 1.5rem;
    }

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

    .play-controls {
        flex-direction: column;
    }

    .play-controls .btn {
        max-width: 100%;
    }

    .preset-buttons {
        grid-template-columns: 1fr;
    }

    .info-section article {
        padding: 1.5rem;
    }
}

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

    .generator-container {
        padding: 1rem;
    }

    .info-section article {
        padding: 1rem;
    }

    .frequency-input-group input[type="number"] {
        font-size: 1.2rem;
    }
}

/* Print Styles */
@media print {
    body {
        background: white;
        color: black;
    }

    .generator-container,
    .visualizer-container {
        display: none;
    }

    .info-section article {
        page-break-inside: avoid;
    }
}

/* Accessibility */
@media (prefers-reduced-motion: reduce) {
    * {
        animation: none !important;
        transition: none !important;
    }
}

/* High Contrast Mode */
@media (prefers-contrast: high) {
    :root {
        --primary-color: #00ffff;
        --background-dark: #000000;
        --background-light: #1a1a1a;
        --text-color: #ffffff;
    }
}

/* Focus Styles for Accessibility */
*:focus-visible {
    outline: 3px solid var(--primary-color);
    outline-offset: 2px;
}

/* Animation for Active State */
@keyframes pulse {
    0%, 100% {
        opacity: 1;
    }
    50% {
        opacity: 0.7;
    }
}

.btn.active {
    animation: pulse 2s infinite;
}