/* Sound Waves Discovery - Styles */

:root {
    --bg-dark: #0a0a0f;
    --bg-card: #1a1a2e;
    --bg-panel: #16213e;
    --text-primary: #ffffff;
    --text-secondary: #a0a0b0;
    --primary: #f59e0b;
    --primary-dim: #d97706;
    --primary-glow: rgba(245, 158, 11, 0.3);
    --success: #10b981;
    --danger: #ef4444;
}

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

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

/* Screens */
.screen {
    display: none;
    min-height: 100vh;
}

.screen.active {
    display: block;
}

/* Start Screen */
#start-screen {
    display: none;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at center, #1a1a2e 0%, #0a0a0f 70%);
    padding: 2rem;
}

#start-screen.active {
    display: flex;
}

.start-content {
    text-align: center;
    max-width: 500px;
}

.logo-icon {
    margin-bottom: 2rem;
    animation: pulse-glow 2s ease-in-out infinite;
}

@keyframes pulse-glow {
    0%, 100% { filter: drop-shadow(0 0 20px var(--primary-glow)); }
    50% { filter: drop-shadow(0 0 40px var(--primary)); }
}

/* Interactive Sound Wave Canvas */
.logo-icon.interactive-waves {
    animation: none;
    display: flex;
    flex-direction: column;
    align-items: center;
}

#start-canvas {
    border-radius: 12px;
    background: rgba(26, 26, 46, 0.8);
    border: 2px solid rgba(245, 158, 11, 0.3);
    cursor: pointer;
    transition: border-color 0.3s ease, box-shadow 0.3s ease;
    max-width: 100%;
    height: auto;
}

#start-canvas:hover {
    border-color: rgba(245, 158, 11, 0.6);
    box-shadow: 0 0 30px rgba(245, 158, 11, 0.2);
}

#start-canvas:active {
    transform: scale(0.98);
}

.canvas-hint {
    font-size: 0.85rem;
    color: var(--text-secondary);
    margin-top: 0.5rem;
    opacity: 0.7;
    animation: hint-pulse 2s ease-in-out infinite;
}

@keyframes hint-pulse {
    0%, 100% { opacity: 0.5; }
    50% { opacity: 1; }
}

.start-content h1 {
    font-size: 3rem;
    font-weight: 700;
    margin-bottom: 0.5rem;
    background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    font-size: 1.5rem;
    color: var(--primary);
    margin-bottom: 1rem;
}

.description {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 2rem;
}

.primary-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.75rem;
    padding: 1rem 2rem;
    font-size: 1.25rem;
    font-weight: 600;
    color: #000;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
    border: none;
    border-radius: 50px;
    cursor: pointer;
    transition: all 0.3s;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.primary-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--primary-glow);
}

.btn-icon {
    font-size: 1.5rem;
}

.hint {
    margin-top: 1rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
    opacity: 0.7;
}

/* Experience Screen */
#experience-screen {
    display: none;
    grid-template-columns: 1fr 350px;
    height: 100vh;
}

#experience-screen.active {
    display: grid;
}

/* Visualization Container */
.visualization-container {
    position: relative;
    background: var(--bg-dark);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

#waveform-canvas,
#frequency-canvas {
    width: 100%;
    flex: 1;
    display: block;
}

#frequency-canvas {
    display: none;
}

.visualization-container.mode-frequency #waveform-canvas {
    display: none;
}

.visualization-container.mode-frequency #frequency-canvas {
    display: block;
}

.visualization-container.mode-both #waveform-canvas,
.visualization-container.mode-both #frequency-canvas {
    display: block;
    flex: 0.5;
}

/* Overlay Info */
.viz-overlay {
    position: absolute;
    top: 1rem;
    left: 1rem;
    right: 1rem;
    display: flex;
    justify-content: space-between;
    pointer-events: none;
}

.metric {
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 0.75rem 1rem;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    min-width: 120px;
}

.metric-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.metric-bar {
    height: 6px;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    overflow: hidden;
}

.metric-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--success) 0%, var(--primary) 50%, var(--danger) 100%);
    width: 0%;
    transition: width 0.05s;
}

.metric-value {
    font-size: 1.25rem;
    font-weight: 600;
    color: var(--primary);
}

.metric-note {
    font-size: 1rem;
    color: var(--text-secondary);
}

/* Mode Indicator */
.mode-indicator {
    position: absolute;
    bottom: 1rem;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(0, 0, 0, 0.7);
    backdrop-filter: blur(10px);
    padding: 0.5rem 1rem;
    border-radius: 20px;
    display: flex;
    align-items: center;
    gap: 0.5rem;
    font-size: 0.875rem;
    color: var(--text-secondary);
}

.mode-indicator .mode-icon {
    animation: bounce 1s infinite;
}

@keyframes bounce {
    0%, 100% { transform: translateY(0); }
    50% { transform: translateY(-3px); }
}

/* Control Panel */
.control-panel {
    background: var(--bg-panel);
    border-left: 1px solid rgba(255, 255, 255, 0.1);
    padding: 1.5rem;
    overflow-y: auto;
    display: flex;
    flex-direction: column;
    gap: 1.5rem;
}

.panel-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.panel-header h2 {
    font-size: 1.5rem;
    font-weight: 600;
}

.done-btn {
    padding: 0.5rem 1rem;
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    background: transparent;
    border: 2px solid var(--primary);
    border-radius: 20px;
    cursor: pointer;
    transition: all 0.2s;
}

.done-btn:hover {
    background: var(--primary);
    color: #000;
}

/* Control Sections */
.control-section {
    background: var(--bg-card);
    border-radius: 12px;
    padding: 1rem;
}

.control-section h3 {
    font-size: 0.875rem;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
}

.section-hint {
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.75rem;
}

/* Visualization Mode Buttons */
.viz-modes {
    display: flex;
    gap: 0.5rem;
}

.viz-mode {
    flex: 1;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid transparent;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.viz-mode:hover {
    background: rgba(255, 255, 255, 0.1);
}

.viz-mode.active {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(245, 158, 11, 0.1);
}

.mode-preview {
    width: 40px;
    height: 20px;
    border-radius: 4px;
    background: var(--bg-dark);
}

.waveform-preview {
    background: linear-gradient(90deg,
        var(--bg-dark) 0%, var(--primary) 25%, var(--bg-dark) 50%,
        var(--primary) 75%, var(--bg-dark) 100%);
}

.frequency-preview {
    background: linear-gradient(0deg, var(--primary) 30%, var(--bg-dark) 30%);
}

.both-preview {
    background: linear-gradient(180deg,
        var(--primary) 0%, var(--bg-dark) 40%,
        var(--bg-dark) 60%, var(--primary) 100%);
}

/* Source Buttons */
.source-buttons {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 0.75rem;
}

.source-btn {
    flex: 1;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.05);
    border: 2px solid transparent;
    border-radius: 8px;
    color: var(--text-secondary);
    font-size: 0.875rem;
    cursor: pointer;
    transition: all 0.2s;
}

.source-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.source-btn.active {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(245, 158, 11, 0.1);
}

/* Tone Controls */
.tone-controls {
    margin-top: 0.75rem;
    padding-top: 0.75rem;
    border-top: 1px solid rgba(255, 255, 255, 0.1);
}

.control-row {
    margin-bottom: 0.75rem;
}

.control-row label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-secondary);
    margin-bottom: 0.25rem;
}

.slider-row {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.slider-row input[type="range"] {
    flex: 1;
    height: 6px;
    -webkit-appearance: none;
    appearance: none;
    background: rgba(255, 255, 255, 0.1);
    border-radius: 3px;
    outline: none;
}

.slider-row input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--primary);
    cursor: pointer;
}

.slider-value {
    min-width: 60px;
    font-size: 0.875rem;
    color: var(--primary);
    text-align: right;
}

/* Wave Buttons */
.wave-buttons {
    display: flex;
    gap: 0.25rem;
}

.wave-btn {
    flex: 1;
    padding: 0.5rem;
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid transparent;
    border-radius: 4px;
    color: var(--text-secondary);
    font-size: 0.7rem;
    cursor: pointer;
    transition: all 0.2s;
}

.wave-btn:hover {
    background: rgba(255, 255, 255, 0.1);
}

.wave-btn.active {
    border-color: var(--primary);
    color: var(--primary);
    background: rgba(245, 158, 11, 0.1);
}

/* Play Tone Button */
.play-tone-btn {
    width: 100%;
    padding: 0.75rem;
    margin-top: 0.5rem;
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
    border: none;
    border-radius: 8px;
    color: #000;
    font-size: 0.875rem;
    font-weight: 600;
    cursor: pointer;
    transition: all 0.2s;
}

.play-tone-btn:hover {
    transform: translateY(-1px);
    box-shadow: 0 4px 15px var(--primary-glow);
}

.play-tone-btn.playing {
    background: linear-gradient(135deg, var(--danger) 0%, #dc2626 100%);
}

/* Piano Keys */
.piano-keys {
    display: flex;
    height: 80px;
    position: relative;
    background: #222;
    border-radius: 0 0 8px 8px;
    padding: 0 2px 4px 2px;
}

.piano-key {
    border: none;
    cursor: pointer;
    transition: all 0.1s;
    font-size: 0.6rem;
    font-weight: 600;
    display: flex;
    align-items: flex-end;
    justify-content: center;
    padding-bottom: 4px;
}

.piano-key.white {
    flex: 1;
    background: linear-gradient(180deg, #f5f5f5 0%, #e0e0e0 100%);
    color: #333;
    border-radius: 0 0 4px 4px;
    margin: 0 1px;
    z-index: 1;
}

.piano-key.black {
    position: absolute;
    width: 20px;
    height: 50px;
    background: linear-gradient(180deg, #333 0%, #111 100%);
    color: #888;
    border-radius: 0 0 3px 3px;
    z-index: 2;
    margin-left: -10px;
}

/* Position black keys */
.piano-key.black[data-note="C#4"] { left: calc(100% / 13 * 1); }
.piano-key.black[data-note="D#4"] { left: calc(100% / 13 * 2); }
.piano-key.black[data-note="F#4"] { left: calc(100% / 13 * 4); }
.piano-key.black[data-note="G#4"] { left: calc(100% / 13 * 5); }
.piano-key.black[data-note="A#4"] { left: calc(100% / 13 * 6); }

.piano-key.white:hover {
    background: linear-gradient(180deg, #fff 0%, #f0f0f0 100%);
}

.piano-key.black:hover {
    background: linear-gradient(180deg, #444 0%, #222 100%);
}

.piano-key.white:active,
.piano-key.white.active {
    background: linear-gradient(180deg, var(--primary) 0%, var(--primary-dim) 100%);
    color: #000;
}

.piano-key.black:active,
.piano-key.black.active {
    background: linear-gradient(180deg, var(--primary-dim) 0%, var(--primary) 100%);
    color: #000;
}

/* Learn Cards */
.learn-cards {
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.learn-card {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(255, 255, 255, 0.03);
    border-radius: 8px;
    border-left: 3px solid var(--primary);
}

.learn-icon {
    font-size: 1.25rem;
    line-height: 1;
}

.learn-card h4 {
    font-size: 0.8rem;
    font-weight: 600;
    margin-bottom: 0.25rem;
}

.learn-card p {
    font-size: 0.7rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

/* Fun Facts */
.fun-fact {
    display: flex;
    align-items: flex-start;
    gap: 0.75rem;
    padding: 0.75rem;
    background: rgba(245, 158, 11, 0.1);
    border-radius: 8px;
}

.fact-icon {
    font-size: 1.25rem;
}

.fun-fact p {
    font-size: 0.8rem;
    color: var(--text-secondary);
    line-height: 1.4;
}

.next-fact-btn {
    width: 100%;
    padding: 0.5rem;
    margin-top: 0.5rem;
    background: transparent;
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 6px;
    color: var(--text-secondary);
    font-size: 0.75rem;
    cursor: pointer;
    transition: all 0.2s;
}

.next-fact-btn:hover {
    border-color: var(--primary);
    color: var(--primary);
}

/* End Screen */
#end-screen {
    display: none;
    align-items: center;
    justify-content: center;
    background: radial-gradient(ellipse at center, #1a1a2e 0%, #0a0a0f 70%);
    padding: 2rem;
}

#end-screen.active {
    display: flex;
}

.end-content {
    text-align: center;
    max-width: 700px;
}

.completion-badge {
    margin-bottom: 1.5rem;
    animation: pulse-glow 2s ease-in-out infinite;
}

.end-content h1 {
    font-size: 2.5rem;
    font-weight: 700;
    margin-bottom: 1rem;
    background: linear-gradient(135deg, #fff 0%, var(--primary) 100%);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.end-summary {
    font-size: 1.1rem;
    color: var(--text-secondary);
    line-height: 1.6;
    margin-bottom: 2rem;
}

/* Stats Grid */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 1rem;
    margin-bottom: 2rem;
}

.stat-card {
    background: var(--bg-card);
    padding: 1.25rem;
    border-radius: 12px;
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
}

.stat-icon {
    font-size: 1.5rem;
}

.stat-value {
    font-size: 1.5rem;
    font-weight: 700;
    color: var(--primary);
}

.stat-label {
    font-size: 0.75rem;
    color: var(--text-secondary);
}

/* Key Learnings */
.key-learnings {
    background: var(--bg-card);
    padding: 1.5rem;
    border-radius: 12px;
    margin-bottom: 2rem;
    text-align: left;
}

.key-learnings h3 {
    font-size: 1rem;
    margin-bottom: 1rem;
    color: var(--primary);
}

.key-learnings ul {
    list-style: none;
}

.key-learnings li {
    padding: 0.5rem 0;
    padding-left: 1.5rem;
    position: relative;
    font-size: 0.9rem;
    color: var(--text-secondary);
}

.key-learnings li::before {
    content: '✓';
    position: absolute;
    left: 0;
    color: var(--primary);
}

.key-learnings li strong {
    color: var(--text-primary);
}

/* CTA Section */
.cta-section {
    margin-top: 2rem;
}

.cta-section h3 {
    font-size: 1.25rem;
    margin-bottom: 0.5rem;
}

.cta-section p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
}

.cta-buttons {
    display: flex;
    justify-content: center;
    gap: 1rem;
}

.cta-btn {
    display: inline-flex;
    align-items: center;
    gap: 0.5rem;
    padding: 1rem 2rem;
    font-size: 1rem;
    font-weight: 600;
    text-decoration: none;
    border-radius: 50px;
    transition: all 0.3s;
    border: none;
    cursor: pointer;
}

.cta-btn:disabled {
    opacity: 0.7;
    cursor: wait;
}

.cta-btn.primary {
    background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dim) 100%);
    color: #000;
    box-shadow: 0 4px 20px var(--primary-glow);
}

.cta-btn.primary:hover {
    transform: translateY(-2px);
    box-shadow: 0 8px 30px var(--primary-glow);
}

.cta-btn.secondary {
    background: rgba(255, 255, 255, 0.1);
    color: var(--text-primary);
    border: 1px solid rgba(255, 255, 255, 0.2);
}

.cta-btn.secondary:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Modal */
.modal {
    display: none;
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.8);
    backdrop-filter: blur(5px);
    align-items: center;
    justify-content: center;
    z-index: 1000;
    padding: 2rem;
}

.modal.active {
    display: flex;
}

.modal-content {
    background: var(--bg-card);
    padding: 2rem;
    border-radius: 20px;
    text-align: center;
    max-width: 400px;
}

.modal-icon {
    font-size: 3rem;
    margin-bottom: 1rem;
}

.modal-content h2 {
    margin-bottom: 1rem;
}

.modal-content p {
    color: var(--text-secondary);
    margin-bottom: 1.5rem;
    line-height: 1.5;
}

.modal-buttons {
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.secondary-btn {
    padding: 0.75rem 1.5rem;
    font-size: 1rem;
    background: rgba(255, 255, 255, 0.1);
    border: 1px solid rgba(255, 255, 255, 0.2);
    border-radius: 25px;
    color: var(--text-primary);
    cursor: pointer;
    transition: all 0.2s;
}

.secondary-btn:hover {
    background: rgba(255, 255, 255, 0.2);
}

/* Responsive */
@media (max-width: 900px) {
    #experience-screen.active {
        grid-template-columns: 1fr;
        grid-template-rows: 50vh 1fr;
    }

    .control-panel {
        border-left: none;
        border-top: 1px solid rgba(255, 255, 255, 0.1);
    }

    .viz-overlay {
        flex-direction: column;
        gap: 0.5rem;
        align-items: flex-start;
    }

    .metric {
        min-width: auto;
    }
}

@media (max-width: 600px) {
    .start-content h1 {
        font-size: 2rem;
    }

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

    .cta-buttons {
        flex-direction: column;
    }

    .piano-key.black {
        width: 16px;
        margin-left: -8px;
    }
}