/* CSS Variables */
:root {
    --primary-color: #6366f1;
    --primary-hover: #4f46e5;
    --secondary-color: #64748b;
    --secondary-hover: #475569;
    --accent-color: #06b6d4;
    --success-color: #10b981;
    --warning-color: #f59e0b;
    --error-color: #ef4444;

    --bg-primary: #0f172a;
    --bg-secondary: #1e293b;
    --bg-tertiary: #334155;
    --bg-card: #1e293b;

    --text-primary: #f8fafc;
    --text-secondary: #94a3b8;
    --text-muted: #64748b;

    --border-color: #334155;
    --border-radius: 12px;
    --border-radius-sm: 8px;

    --shadow-sm: 0 1px 2px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.3), 0 2px 4px -1px rgba(0, 0, 0, 0.2);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.3), 0 4px 6px -2px rgba(0, 0, 0, 0.2);

    --transition-fast: 150ms ease;
    --transition-normal: 250ms ease;
}

/* Reset & Base */
*, *::before, *::after {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

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

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

/* App Container */
.app-container {
    display: flex;
    flex-direction: column;
    min-height: 100vh;
}

/* Header */
.header {
    background: linear-gradient(135deg, var(--bg-secondary) 0%, var(--bg-tertiary) 100%);
    border-bottom: 1px solid var(--border-color);
    padding: 1.5rem;
}

.header-content {
    max-width: 1400px;
    margin: 0 auto;
    text-align: center;
}

.logo-section {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-bottom: 0.5rem;
}

.logo {
    width: 48px;
    height: 48px;
    border-radius: var(--border-radius-sm);
}

.header h1 {
    font-size: 1.75rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--primary-color), var(--accent-color));
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
    background-clip: text;
}

.tagline {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

/* Main Content */
.main-content {
    flex: 1;
    max-width: 1400px;
    width: 100%;
    margin: 0 auto;
    padding: 1.5rem;
}

/* Sections */
.section {
    background: var(--bg-card);
    border-radius: var(--border-radius);
    border: 1px solid var(--border-color);
    padding: 1.5rem;
    margin-bottom: 1.5rem;
}

.section h2 {
    font-size: 1.25rem;
    font-weight: 600;
    margin-bottom: 1rem;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.section h3 {
    font-size: 1rem;
    font-weight: 600;
    margin-bottom: 0.75rem;
    color: var(--text-secondary);
}

/* File Upload */
.file-upload-area {
    border: 2px dashed var(--border-color);
    border-radius: var(--border-radius);
    padding: 2rem;
    text-align: center;
    transition: var(--transition-normal);
    cursor: pointer;
    position: relative;
}

.file-upload-area:hover,
.file-upload-area.dragover {
    border-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.1);
}

.file-input {
    position: absolute;
    width: 100%;
    height: 100%;
    top: 0;
    left: 0;
    opacity: 0;
    cursor: pointer;
}

.file-label {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 0.5rem;
    pointer-events: none;
}

.upload-icon {
    font-size: 3rem;
    margin-bottom: 0.5rem;
}

.upload-text {
    font-size: 1rem;
    color: var(--text-primary);
}

.file-types {
    font-size: 0.85rem;
    color: var(--text-muted);
}

.file-info {
    margin-top: 1rem;
    padding: 0.75rem;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    display: none;
}

.file-info.visible {
    display: block;
}

.file-info p {
    color: var(--text-secondary);
    font-size: 0.9rem;
}

.file-info .filename {
    color: var(--primary-color);
    font-weight: 500;
}

/* Audio Player */
.audio-player {
    margin-top: 1.5rem;
    padding: 1rem;
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
}

.audio-player audio {
    width: 100%;
    margin-bottom: 1rem;
}

.playback-controls {
    display: flex;
    align-items: center;
    gap: 1rem;
    flex-wrap: wrap;
}

.time-display {
    color: var(--text-secondary);
    font-family: monospace;
    font-size: 0.9rem;
    margin-left: auto;
}

/* Buttons */
.btn {
    display: inline-flex;
    align-items: center;
    justify-content: center;
    gap: 0.5rem;
    padding: 0.625rem 1.25rem;
    font-size: 0.9rem;
    font-weight: 500;
    border: none;
    border-radius: var(--border-radius-sm);
    cursor: pointer;
    transition: var(--transition-fast);
    text-decoration: none;
}

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

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

.btn-secondary {
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
}

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

.btn-large {
    padding: 0.875rem 2rem;
    font-size: 1rem;
}

.btn-small {
    padding: 0.375rem 0.75rem;
    font-size: 0.85rem;
}

.btn-icon {
    width: 36px;
    height: 36px;
    padding: 0;
    font-size: 1.25rem;
    border-radius: 50%;
}

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

.action-buttons {
    display: flex;
    justify-content: center;
    margin-top: 1.5rem;
}

/* Controls Grid */
.controls-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
    gap: 1.5rem;
}

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

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

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

.control-group input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 18px;
    height: 18px;
    background: var(--primary-color);
    border-radius: 50%;
    cursor: pointer;
    transition: var(--transition-fast);
}

.control-group input[type="range"]::-webkit-slider-thumb:hover {
    background: var(--primary-hover);
    transform: scale(1.1);
}

.control-group select {
    padding: 0.625rem;
    font-size: 0.9rem;
    background: var(--bg-tertiary);
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-sm);
    cursor: pointer;
}

.control-group select:focus {
    outline: none;
    border-color: var(--primary-color);
}

.slider-value {
    font-size: 0.85rem;
    color: var(--primary-color);
    font-weight: 500;
}

/* Visualization Container */
.visualization-container {
    display: grid;
    grid-template-columns: 1fr 300px;
    gap: 1.5rem;
}

@media (max-width: 900px) {
    .visualization-container {
        grid-template-columns: 1fr;
    }
}

.canvas-wrapper {
    position: relative;
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
    aspect-ratio: 16 / 10;
    min-height: 300px;
}

#visualizationCanvas {
    width: 100%;
    height: 100%;
    display: block;
    cursor: grab;
}

#visualizationCanvas:active {
    cursor: grabbing;
}

.canvas-labels {
    position: absolute;
    bottom: 10px;
    left: 0;
    right: 0;
    display: flex;
    justify-content: space-between;
    padding: 0 20px;
    pointer-events: none;
}

.canvas-labels .label {
    color: var(--text-muted);
    font-size: 0.8rem;
    font-weight: 500;
    background: rgba(15, 23, 42, 0.8);
    padding: 0.25rem 0.5rem;
    border-radius: 4px;
}

.zoom-controls {
    position: absolute;
    top: 10px;
    right: 10px;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.pan-hint {
    position: absolute;
    bottom: 50px;
    left: 50%;
    transform: translateX(-50%);
    background: rgba(15, 23, 42, 0.9);
    color: var(--text-muted);
    padding: 0.5rem 1rem;
    border-radius: var(--border-radius-sm);
    font-size: 0.8rem;
    opacity: 0;
    transition: var(--transition-normal);
    pointer-events: none;
}

.canvas-wrapper:hover .pan-hint {
    opacity: 1;
}

/* Event Panel */
.event-panel {
    background: var(--bg-tertiary);
    border-radius: var(--border-radius-sm);
    padding: 1rem;
    display: flex;
    flex-direction: column;
}

.event-stats {
    display: grid;
    grid-template-columns: repeat(3, 1fr);
    gap: 0.5rem;
    margin-bottom: 1rem;
    padding-bottom: 1rem;
    border-bottom: 1px solid var(--border-color);
}

.stat {
    text-align: center;
}

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

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

.event-list-container {
    flex: 1;
    overflow-y: auto;
    max-height: 300px;
}

.event-list {
    list-style: none;
}

.event-list li {
    padding: 0.75rem;
    border-radius: var(--border-radius-sm);
    margin-bottom: 0.5rem;
    background: var(--bg-secondary);
    cursor: pointer;
    transition: var(--transition-fast);
    border-left: 3px solid transparent;
}

.event-list li:hover {
    background: var(--bg-primary);
}

.event-list li.active {
    border-left-color: var(--primary-color);
    background: rgba(99, 102, 241, 0.15);
}

.event-list li.left-dominant {
    border-left-color: var(--accent-color);
}

.event-list li.right-dominant {
    border-left-color: var(--warning-color);
}

.event-list li.center {
    border-left-color: var(--success-color);
}

.event-time {
    font-family: monospace;
    font-size: 0.85rem;
    color: var(--text-secondary);
}

.event-position {
    font-size: 0.8rem;
    color: var(--text-muted);
    margin-top: 0.25rem;
}

.event-intensity {
    display: inline-block;
    width: 8px;
    height: 8px;
    border-radius: 50%;
    margin-right: 0.5rem;
}

/* Timeline */
.timeline-section {
    margin-top: 1.5rem;
}

.timeline-container {
    position: relative;
    height: 80px;
    background: var(--bg-primary);
    border-radius: var(--border-radius-sm);
    overflow: hidden;
}

#timelineCanvas {
    width: 100%;
    height: 100%;
    display: block;
}

.timeline-cursor {
    position: absolute;
    top: 0;
    width: 2px;
    height: 100%;
    background: var(--error-color);
    pointer-events: none;
    display: none;
}

.timeline-controls {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 1rem;
    margin-top: 0.75rem;
}

.current-event-info {
    font-size: 0.9rem;
    color: var(--text-secondary);
    min-width: 200px;
    text-align: center;
}

/* Export Section */
.export-section {
    margin-top: 1.5rem;
    padding-top: 1.5rem;
    border-top: 1px solid var(--border-color);
}

.export-buttons {
    display: flex;
    flex-wrap: wrap;
    gap: 0.75rem;
}

/* Loading Overlay */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.9);
    display: flex;
    align-items: center;
    justify-content: center;
    z-index: 1000;
}

.loading-content {
    text-align: center;
    padding: 2rem;
}

.spinner {
    width: 50px;
    height: 50px;
    border: 4px solid var(--bg-tertiary);
    border-top-color: var(--primary-color);
    border-radius: 50%;
    animation: spin 1s linear infinite;
    margin: 0 auto 1rem;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.progress-bar {
    width: 200px;
    height: 6px;
    background: var(--bg-tertiary);
    border-radius: 3px;
    margin: 1rem auto 0.5rem;
    overflow: hidden;
}

.progress-fill {
    height: 100%;
    background: linear-gradient(90deg, var(--primary-color), var(--accent-color));
    width: 0%;
    transition: width 0.3s ease;
}

.progress-text {
    font-size: 0.9rem;
    color: var(--text-secondary);
}

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

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

.footer a {
    color: var(--primary-color);
    text-decoration: none;
    font-weight: 500;
    transition: var(--transition-fast);
}

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

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

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

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

::-webkit-scrollbar-thumb:hover {
    background: var(--secondary-color);
}

/* Responsive Design */
@media (max-width: 768px) {
    .header {
        padding: 1rem;
    }

    .header h1 {
        font-size: 1.35rem;
    }

    .logo {
        width: 36px;
        height: 36px;
    }

    .main-content {
        padding: 1rem;
    }

    .section {
        padding: 1rem;
    }

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

    .event-stats {
        grid-template-columns: repeat(3, 1fr);
    }

    .stat-value {
        font-size: 1.25rem;
    }

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

    .export-buttons .btn {
        width: 100%;
    }

    .playback-controls {
        flex-direction: column;
        align-items: stretch;
    }

    .time-display {
        margin-left: 0;
        text-align: center;
    }

    .canvas-wrapper {
        aspect-ratio: 4 / 3;
    }

    .zoom-controls {
        top: 5px;
        right: 5px;
    }

    .btn-icon {
        width: 32px;
        height: 32px;
        font-size: 1rem;
    }
}

@media (max-width: 480px) {
    .logo-section {
        flex-direction: column;
        gap: 0.5rem;
    }

    .header h1 {
        font-size: 1.15rem;
    }

    .tagline {
        font-size: 0.85rem;
    }

    .file-upload-area {
        padding: 1.5rem 1rem;
    }

    .upload-icon {
        font-size: 2rem;
    }

    .timeline-controls {
        flex-direction: column;
        gap: 0.5rem;
    }

    .btn-small {
        width: 100%;
    }
}

/* High contrast media query */
@media (prefers-contrast: high) {
    :root {
        --border-color: #64748b;
    }

    .btn-secondary {
        border-width: 2px;
    }
}

/* Reduced motion */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        transition-duration: 0.01ms !important;
    }
}