:root {
    --bg-color: #0d1117;
    --panel-bg: rgba(30, 35, 45, 0.4);
    --panel-border: rgba(255, 255, 255, 0.08);
    --text-primary: #e6edf3;
    --text-secondary: #8b949e;
    --accent-color: #58a6ff;
    --accent-hover: #79c0ff;
    --accent-alpha: rgba(88, 166, 255, 0.2);
    --danger-color: #f85149;
    --success-color: #2ea043;
}

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

body {
    font-family: 'Inter', -apple-system, sans-serif;
    background-color: var(--bg-color);
    color: var(--text-primary);
    line-height: 1.5;
    height: 100vh;
    overflow: hidden;
    background-image: 
        radial-gradient(circle at 15% 50%, rgba(88, 166, 255, 0.05), transparent 25%),
        radial-gradient(circle at 85% 30%, rgba(138, 43, 226, 0.05), transparent 25%);
}

.app-container {
    display: flex;
    flex-direction: column;
    height: 100vh;
    padding: 20px;
    gap: 20px;
    max-width: 1600px;
    margin: 0 auto;
}

/* Glassmorphism utility */
.glass-panel {
    background: var(--panel-bg);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--panel-border);
    border-radius: 12px;
    box-shadow: 0 8px 32px 0 rgba(0, 0, 0, 0.3);
}

header {
    padding: 20px 30px;
    text-align: center;
    flex-shrink: 0;
}

header h1 {
    font-weight: 600;
    font-size: 1.8rem;
    margin-bottom: 5px;
    background: linear-gradient(90deg, #58a6ff, #a371f7);
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

header p {
    color: var(--text-secondary);
    font-size: 0.95rem;
}

.main-content {
    display: flex;
    gap: 20px;
    flex: 1;
    min-height: 0; /* Important for scrollable children */
}

/* Typography styles */
h3 {
    font-size: 1.1rem;
    font-weight: 600;
    margin-bottom: 15px;
    color: var(--text-primary);
    display: flex;
    align-items: center;
    gap: 8px;
}

.text-sm {
    font-size: 0.85rem;
    color: var(--text-secondary);
}

/* Left Panel */
.left-panel {
    display: flex;
    flex-direction: column;
    gap: 20px;
    width: 350px;
    flex-shrink: 0;
    overflow-y: auto;
    padding-right: 8px;
}

.left-panel::-webkit-scrollbar {
    width: 6px;
}
.left-panel::-webkit-scrollbar-track {
    background: transparent;
}
.left-panel::-webkit-scrollbar-thumb {
    background: var(--panel-border);
    border-radius: 4px;
}
.left-panel::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.2);
}

.controls, .chart-container, .description-panel {
    padding: 20px;
}

.description-panel p {
    margin-bottom: 8px;
}
.description-panel p:last-child {
    margin-bottom: 0;
}

.canvas-container {
    padding: 20px;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
}

.chart-container {
    height: 250px;
    flex-shrink: 0;
}

.description {
    margin-bottom: 12px;
}

.control-group {
    margin-bottom: 20px;
}

.control-group label {
    display: block;
    margin-bottom: 8px;
    font-size: 0.9rem;
    color: var(--text-primary);
}

.file-upload-group {
    display: flex;
    align-items: center;
    gap: 12px;
}

#fileName {
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
    max-width: 150px;
}

input[type="range"] {
    width: 100%;
    margin-bottom: 4px;
    accent-color: var(--accent-color);
}

.value-display {
    font-family: monospace;
    font-size: 0.9rem;
    color: var(--accent-color);
    background: var(--accent-alpha);
    padding: 2px 6px;
    border-radius: 4px;
    float: right;
}

/* Buttons */
.btn {
    display: inline-block;
    padding: 8px 16px;
    border-radius: 6px;
    font-size: 0.9rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
    text-align: center;
}

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

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

.action-btn {
    width: 100%;
    background-color: var(--accent-color);
    color: #000;
    padding: 10px;
    margin-top: 10px;
}

.action-btn:hover:not(:disabled) {
    background-color: var(--accent-hover);
    transform: translateY(-1px);
}

.action-btn:disabled {
    background-color: var(--panel-border);
    color: var(--text-secondary);
    cursor: not-allowed;
    opacity: 0.7;
}

.status-msg {
    margin-top: 10px;
    text-align: center;
    font-style: italic;
}

/* Canvas Wrapper */
.canvas-wrapper {
    position: relative;
    width: 100%;
    background: #000;
    border-radius: 8px;
    overflow: hidden;
    border: 1px solid var(--panel-border);
    aspect-ratio: 1; /* Keep it square for consistent interaction */
    display: flex;
    justify-content: center;
    align-items: center;
}

canvas {
    max-width: 100%;
    max-height: 100%;
    object-fit: contain;
}

#overlayCanvas {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    pointer-events: none; /* Let clicks pass through to main canvas */
}

#mainCanvas {
    cursor: crosshair;
}


/* Right Panel (Grid) */
.right-panel {
    flex: 1;
    display: flex;
    flex-direction: column;
    gap: 10px;
    min-width: 0; /* Prevent overflow */
}

.tabs {
    display: flex;
    padding: 10px;
    gap: 10px;
}

.tab-btn {
    flex: 1;
    padding: 10px;
    background: transparent;
    border: none;
    color: var(--text-secondary);
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    border-radius: 6px;
    transition: all 0.2s;
}

.tab-btn:hover {
    background: rgba(255,255,255,0.05);
}

.tab-btn.active {
    background: var(--accent-alpha);
    color: var(--accent-color);
    border-bottom: 2px solid var(--accent-color);
}

.pyramid-view-container {
    flex: 1;
    overflow-y: auto;
    padding: 20px;
    position: relative;
}

/* Scrollbar styling */
.pyramid-view-container::-webkit-scrollbar {
    width: 8px;
}
.pyramid-view-container::-webkit-scrollbar-track {
    background: transparent;
}
.pyramid-view-container::-webkit-scrollbar-thumb {
    background: var(--panel-border);
    border-radius: 4px;
}
.pyramid-view-container::-webkit-scrollbar-thumb:hover {
    background: rgba(255,255,255,0.2);
}

.view-content {
    display: none;
    flex-direction: column;
    gap: 30px;
}

.view-content.active {
    display: flex;
}

.empty-state {
    position: absolute;
    top: 50%;
    left: 50%;
    transform: translate(-50%, -50%);
    color: var(--text-secondary);
    font-size: 1.1rem;
}

/* Octave Grid Layout */
.octave-row {
    background: rgba(0,0,0,0.2);
    border-radius: 8px;
    padding: 15px;
    border: 1px solid var(--panel-border);
}

.octave-header {
    border-bottom: 1px solid var(--panel-border);
    padding-bottom: 8px;
    margin-bottom: 15px;
    font-size: 1.1rem;
    color: #e6edf3;
}

.image-grid {
    display: flex;
    flex-wrap: wrap;
    gap: 15px;
    justify-content: flex-start;
}

.grid-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 8px;
    background: var(--bg-color);
    padding: 10px;
    border-radius: 6px;
    border: 1px solid var(--panel-border);
}

.grid-item canvas {
    background: #000;
    image-rendering: pixelated; /* Sharp edges for downsampled images */
}

.grid-label {
    font-size: 0.8rem;
    color: var(--text-secondary);
    font-family: monospace;
}