/* CSS Variables (Custom Properties) */
:root {
    /* Color Palette */
    --color-primary: #000000;
    --color-secondary: #ffffff;
    --color-accent: #00ff88;
    --color-accent-hover: #00dd77;
    
    /* Background Colors */
    --bg-primary: #000000;
    --bg-secondary: #111111;
    --bg-tertiary: #222222;
    --bg-overlay: rgba(0, 0, 0, 0.8);
    --bg-overlay-light: rgba(0, 0, 0, 0.9);
    
    /* Border Colors */
    --border-primary: #333333;
    --border-secondary: #555555;
    --border-hover: #ffffff;
    
    /* Text Colors */
    --text-primary: #ffffff;
    --text-secondary: #cccccc;
    --text-muted: #888888;
    --text-accent: #00ff88;
    
    /* Typography */
    --font-family-primary: 'FeatureMono', 'SF Mono', Monaco, 'Inconsolata', 'Roboto Mono', 'Source Code Pro', Consolas, 'Courier New', monospace;
    --font-family-fallback: 'Courier New', monospace;
    
    /* Font Sizes */
    --font-size-xs: 8px;
    --font-size-sm: 11px;
    --font-size-base: 12px;
    --font-size-md: 13px;
    --font-size-lg: 14px;
    --font-size-xl: 16px;
    --font-size-2xl: 32px;
    
    /* Spacing */
    --spacing-xs: 5px;
    --spacing-sm: 8px;
    --spacing-md: 10px;
    --spacing-lg: 15px;
    --spacing-xl: 20px;
    --spacing-2xl: 25px;
    --spacing-3xl: 30px;
    --spacing-4xl: 43px;
    
    /* Border Radius */
    --radius-sm: 3px;
    --radius-md: 4px;
    --radius-lg: 8px;
    
    /* Transitions */
    --transition-fast: 0.1s ease;
    --transition-base: 0.2s ease;
    --transition-slow: 0.3s ease;
    
    /* Layout */
    --controls-width: 320px;
    --controls-min-width: 250px;
    --controls-max-width: 30vw;
    --resize-handle-width: 7px;
    --resize-handle-height: 30px;
    --button-size: 50px;
    --scrollbar-width: 8px;
    
    /* Z-index layers */
    --z-base: 100;
    --z-controls: 1000;
    --z-tooltip: 2000;
    --z-toast: 9999;
    --z-overlay: 10000;
}

/* Dark theme variations (for future theming support) */
@media (prefers-color-scheme: light) {
    :root {
        --color-primary: #ffffff;
        --color-secondary: #000000;
        --bg-primary: #ffffff;
        --bg-secondary: #f5f5f5;
        --bg-tertiary: #e0e0e0;
        --border-primary: #cccccc;
        --border-secondary: #999999;
        --text-primary: #000000;
        --text-secondary: #333333;
        --text-muted: #666666;
    }
}

body {
    margin: 0;
    padding: 0;
    background: var(--bg-primary);
    color: var(--text-primary);
    display: flex;
    height: 100vh;
    overflow: hidden;
}

#canvas-container {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background: var(--bg-primary);
    overflow: hidden;
    cursor: crosshair;
    position: relative;
}

#controls {
    width: var(--controls-width);
    min-width: var(--controls-min-width);
    max-width: var(--controls-max-width);
    background: var(--bg-primary);
    border-left: 1px solid var(--border-primary);
    height: 100vh;
    overflow-y: scroll;
    overflow-x: hidden;
    padding: 0;
    font-family: var(--font-family-primary);
    position: relative;
    transition: border-left-color var(--transition-base);
}

#controls.resizing {
    border-left-color: var(--text-primary) !important;
}

#resize-handle {
    position: fixed;
    right: calc(var(--controls-width) - var(--resize-handle-width) / 2);
    top: 50%;
    transform: translateY(-50%);
    width: var(--resize-handle-width);
    height: var(--resize-handle-height);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    cursor: ew-resize;
    z-index: var(--z-controls);
    border-radius: var(--radius-sm);
    pointer-events: auto;
}

#resize-handle:hover, #resize-handle.dragging {
    background: var(--text-primary);
    border-color: var(--text-primary);
}

#controls::-webkit-scrollbar {
    width: var(--scrollbar-width);
}

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

#controls::-webkit-scrollbar-thumb {
    background: var(--border-primary);
    border-radius: var(--radius-md);
}

#controls::-webkit-scrollbar-thumb:hover {
    background: var(--border-secondary);
}

.controls-content {
    padding: var(--spacing-xl);
}

.control-group {
    margin-bottom: var(--spacing-2xl);
    padding-bottom: var(--spacing-xl);
    border-bottom: 1px solid var(--border-primary);
    margin-left: calc(-1 * var(--spacing-xl));
    margin-right: calc(-1 * var(--spacing-xl));
    padding-left: var(--spacing-xl);
    padding-right: var(--spacing-xl);
}

.control-group:last-child {
    border-bottom: none;
}

.performance-info {
    margin-top: var(--spacing-md);
    padding: var(--spacing-sm);
    background: var(--bg-tertiary);
    border-radius: var(--radius-sm);
    border-left: 3px solid var(--color-accent);
}

.performance-info small {
    color: var(--text-secondary);
    font-size: var(--font-size-xs);
    line-height: 1.4;
}

.performance-warning {
    margin-top: var(--spacing-xs);
    margin-bottom: var(--spacing-md);
}

.performance-warning small {
    color: #ff6b6b;
    font-size: var(--font-size-xs);
    line-height: 1.4;
}

h3 {
    margin: 0 0 var(--spacing-lg) 0;
    color: var(--text-primary);
    font-size: var(--font-size-lg);
    text-transform: uppercase;
    letter-spacing: 1px;
}

label {
    display: block;
    margin-bottom: var(--spacing-sm);
    font-size: var(--font-size-base);
    color: var(--text-secondary);
}

select, input[type="range"] {
    width: 100%;
    margin-bottom: var(--spacing-lg);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    padding: var(--spacing-xs);
    border-radius: var(--radius-md);
}

input[type="range"] {
    padding: 0;
    -webkit-appearance: none;
    height: 6px;
    background: var(--border-primary);
    outline: none;
}

input[type="range"]::-webkit-slider-thumb {
    -webkit-appearance: none;
    appearance: none;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-primary);
    cursor: pointer;
    border: 2px solid var(--color-primary);
}

input[type="range"]::-webkit-slider-thumb:hover {
    background: #f0f0f0;
}

input[type="range"]::-moz-range-thumb {
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background: var(--text-primary);
    cursor: pointer;
    border: 2px solid var(--color-primary);
}

input[type="range"]::-moz-range-thumb:hover {
    background: #f0f0f0;
}

input[type="range"]::-moz-range-track {
    height: 6px;
    background: var(--border-primary);
    border-radius: var(--radius-sm);
}

/* Checkbox styling for better spacing */
input[type="checkbox"] {
    margin-right: var(--spacing-sm);
    margin-bottom: var(--spacing-sm);
    transform: scale(1.2);
}

/* Labels with checkboxes need extra spacing */
label:has(input[type="checkbox"]) {
    margin-bottom: var(--spacing-md);
    display: flex;
    align-items: center;
    padding: var(--spacing-xs) 0;
}

/* Color input styling */
input[type="color"] {
    margin-bottom: var(--spacing-lg);
    border-radius: var(--radius-md);
    cursor: pointer;
}

.toggle-btn {
    width: 100%;
    padding: var(--spacing-md);
    background: var(--bg-secondary);
    border: 1px solid var(--border-primary);
    color: var(--text-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    font-family: inherit;
    font-size: var(--font-size-base);
    margin-bottom: var(--spacing-md);
    transition: background var(--transition-base);
}

.toggle-btn.active {
    background: var(--text-primary);
    color: var(--color-primary);
}

.toggle-btn:hover {
    background: var(--bg-tertiary);
}

.toggle-btn.active:hover {
    background: var(--color-accent-hover);
}

.dropdown-header {
    cursor: pointer;
    padding: var(--spacing-md) var(--spacing-lg);
    margin-bottom: var(--spacing-xs);
    display: flex;
    justify-content: space-between;
    align-items: center;
    font-size: var(--font-size-md);
    color: var(--text-primary);
}

.dropdown-header:hover {
    background: var(--bg-tertiary);
}

.dropdown-arrow {
    transition: transform var(--transition-base);
    font-size: var(--font-size-sm);
}

.dropdown-arrow.open {
    transform: rotate(90deg);
}

.dropdown-content {
    display: none;
    padding: var(--spacing-xl);
    margin-bottom: var(--spacing-lg);
}

.dropdown-content.open {
    display: block;
}

.value-display {
    font-size: var(--font-size-sm);
    color: var(--text-muted);
    text-align: right;
    margin-bottom: var(--spacing-md);
}

.pattern-preview {
    background: var(--bg-primary);
    padding: var(--spacing-md);
    border-radius: var(--radius-md);
    font-family: var(--font-family-fallback);
    font-size: var(--font-size-xs);
    line-height: 1;
    color: var(--color-accent);
    margin-top: var(--spacing-md);
    overflow: hidden;
}

.title {
    margin-top: var(--spacing-3xl);
    display: flex;
    gap: 16px;
    align-items: baseline;
    position: fixed;
    left: var(--spacing-3xl);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-2xl);
    font-style: normal;
    font-weight: 600;
    line-height: 24px;
    color: var(--text-muted);
}

#button-group {
    position: fixed;
    bottom: var(--spacing-4xl);
    left: 50%;
    transform: translateX(-50%);
    display: flex;
    gap: var(--spacing-md);
    z-index: var(--z-base);
}

#play-pause-btn, #randomize-btn {
    width: var(--button-size);
    height: var(--button-size);
    background: var(--bg-overlay);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    padding: 0;
}

#play-pause-btn:hover, #randomize-btn:hover {
    background: var(--bg-overlay-light);
    border-color: var(--text-primary);
}

#play-pause-btn:hover svg, #randomize-btn:hover svg {
    fill: var(--text-primary);
}

#play-pause-btn.paused {
    background: rgba(255, 255, 255, 0.1);
}

#play-pause-btn svg, #randomize-btn svg {
    width: var(--spacing-xl);
    height: var(--spacing-xl);
    fill: var(--border-primary);
    transition: fill var(--transition-base);
}

#download-container {
    position: relative;
}

#download-btn {
    width: var(--button-size);
    height: var(--button-size);
    background: var(--bg-overlay);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    padding: 0;
}

#download-btn:hover {
    background: var(--bg-overlay-light);
    border-color: var(--text-primary);
}

#download-btn:hover svg {
    fill: var(--text-primary);
}

#download-btn svg {
    width: var(--spacing-xl);
    height: var(--spacing-xl);
    fill: var(--border-primary);
    transition: fill var(--transition-base);
}

.download-menu {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    min-width: 140px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-controls);
    font-family: var(--font-family-primary);
}

.download-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}

.download-option {
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    cursor: pointer;
    border-bottom: 1px solid var(--bg-tertiary);
    transition: all var(--transition-base);
}

.download-option:last-child {
    border-bottom: none;
}

.download-option:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.download-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.download-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

#speed-container {
    position: relative;
}

#speed-btn {
    width: var(--button-size);
    height: var(--button-size);
    background: var(--bg-overlay);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    cursor: pointer;
    display: flex;
    align-items: center;
    justify-content: center;
    transition: all var(--transition-base);
    padding: 0;
}

#speed-btn:hover {
    background: var(--bg-overlay-light);
    border-color: var(--text-primary);
}

#speed-btn:hover .speed-text {
    color: var(--text-primary);
}

.speed-text {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-xl);
    color: var(--border-primary);
    transition: color var(--transition-base);
    font-weight: 400;
}

.speed-menu {
    position: absolute;
    bottom: 60px;
    left: 50%;
    transform: translateX(-50%);
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    min-width: 100px;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-controls);
    font-family: var(--font-family-primary);
}

.speed-menu.show {
    opacity: 1;
    visibility: visible;
    transform: translateX(-50%) translateY(-5px);
}

.speed-option {
    padding: var(--spacing-md) var(--spacing-lg);
    color: var(--text-secondary);
    font-size: var(--font-size-base);
    cursor: pointer;
    border-bottom: 1px solid var(--bg-tertiary);
    transition: all var(--transition-base);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.speed-option:last-child {
    border-bottom: none;
}

.speed-option:hover {
    background: var(--bg-tertiary);
    color: var(--text-primary);
}

.speed-option:first-child {
    border-radius: var(--radius-md) var(--radius-md) 0 0;
}

.speed-option:last-child {
    border-radius: 0 0 var(--radius-md) var(--radius-md);
}

.speed-option .check-icon {
    width: 16px;
    height: 16px;
    stroke: var(--text-primary);
    opacity: 0;
    transition: opacity var(--transition-base);
}

.speed-option.active .check-icon {
    opacity: 1;
}

.tooltip {
    position: fixed;
    background: var(--bg-overlay);
    color: var(--text-primary);
    padding: 6px var(--spacing-md);
    border-radius: var(--radius-md);
    font-family: var(--font-family-primary);
    font-size: var(--font-size-sm);
    pointer-events: none;
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-base);
    z-index: var(--z-tooltip);
    border: 1px solid var(--border-primary);
    white-space: nowrap;
}

.tooltip.show {
    opacity: 1;
    visibility: visible;
}

.tooltip-text {
    display: block;
}

.toast-container {
    position: fixed;
    top: var(--spacing-xl);
    left: 50%;
    transform: translateX(-50%);
    z-index: var(--z-toast);
    pointer-events: none;
}

.toast {
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-md);
    padding: var(--spacing-lg) var(--spacing-xl);
    color: var(--text-primary);
    font-family: var(--font-family-primary);
    min-width: 300px;
    max-width: 400px;
    opacity: 0;
    visibility: hidden;
    transform: translateY(-20px);
    transition: all var(--transition-slow);
    pointer-events: auto;
    display: flex;
    flex-direction: column;
    gap: var(--spacing-sm);
    position: relative;
}

.toast.show {
    opacity: 1;
    visibility: visible;
    transform: translateY(0);
}

.toast-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    gap: var(--spacing-lg);
}

.toast-content {
    flex: 1;
}

.toast-title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-accent);
    margin: 0 0 var(--spacing-xs) 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.toast-filename {
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin: 0;
    word-break: break-all;
}

.toast-close {
    width: var(--spacing-xl);
    height: var(--spacing-xl);
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    color: var(--border-primary);
    transition: color var(--transition-base);
    flex-shrink: 0;
}

.toast-close:hover {
    color: var(--text-primary);
}

.toast-close svg {
    width: 100%;
    height: 100%;
    stroke: currentColor;
}

/* GIF Progress Overlay */
.gif-progress-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: var(--bg-overlay);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: var(--z-overlay);
    opacity: 0;
    visibility: hidden;
    transition: all var(--transition-slow);
}

.gif-progress-overlay.show {
    opacity: 1;
    visibility: visible;
}

.gif-progress-content {
    background: var(--bg-primary);
    border: 1px solid var(--border-primary);
    border-radius: var(--radius-lg);
    padding: var(--spacing-3xl);
    text-align: center;
    min-width: 300px;
    max-width: 400px;
}

.gif-progress-title {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-lg);
    font-weight: 600;
    color: var(--color-accent);
    margin: 0 0 var(--spacing-xl) 0;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}

.gif-progress-bar {
    width: 100%;
    height: 8px;
    background: var(--border-primary);
    border-radius: var(--radius-md);
    overflow: hidden;
    margin: 0 0 var(--spacing-lg) 0;
}

.gif-progress-fill {
    height: 100%;
    background: var(--text-primary);
    width: 0%;
    transition: width var(--transition-fast);
    border-radius: var(--radius-md);
}

.gif-progress-text {
    font-family: var(--font-family-primary);
    font-size: var(--font-size-base);
    color: var(--text-secondary);
    margin: 0;
}