/*
 * TileSort Pro v1.0.0
 * Copyright (c) 2025 Morgan Catlin. All rights reserved.
 * This software is proprietary and confidential.
 */

/* /Users/morgancatlin/projects/connhelp/styles.css */
        :root {
            /* Color palette */
            --color-yellow: #f9df6d;
            --color-green: #a0c35a;
            --color-blue: #b0c4ef;
            --color-purple: #ba81c5;

            /* Disabled color variants - matches original 50% opacity appearance */
            --color-yellow-disabled: rgba(249, 223, 109, 0.5);
            --color-green-disabled: rgba(160, 195, 90, 0.5);
            --color-blue-disabled: rgba(176, 196, 239, 0.5);
            --color-purple-disabled: rgba(186, 129, 197, 0.5);

            /* Dark color variants for borders/accents - softer gradient */
            --color-yellow-dark: #d4b840;
            --color-green-dark: #8db150;
            --color-blue-dark: #9eb0d8;
            --color-purple-dark: #a896b0;

            /* UI colors */
            --bg-color: #f5f5f5;
            --text-color: #333;
            --text-color-secondary: #666;
            --text-color-tertiary: #999;
            --text-on-color: #333;  /* Black text on colored backgrounds */
            --tile-bg: white;
            --border-color: #ccc;
            --border-color-dark: #666;
            --border-focus: #4CAF50;
            --color-current: #2196F3;
            --color-error: #ff6b6b;
            --color-reset-all: #ff6b6b;
            --color-reset-all-border: #ee5555;
            --color-reset-all-hover: #ff5252;
            --color-reset-colors: #ff9800;
            --color-reset-colors-border: #f57c00;
            --color-reset-colors-hover: #f57c00;
            --color-button-hover-bg: #f0f0f0;
            --color-button-hover-bg-alt: #e0e0e0;
            --color-green-hover: #45a049;
            --color-warning-bg: #fff3cd;
            --color-warning-border: #ffc107;
            --bg-overlay: rgba(0, 0, 0, 0.5);
            --bg-focus-ring: rgba(76, 175, 80, 0.2);
            --bg-current-ring: rgba(33, 150, 243, 0.2);
            --bg-shadow: rgba(0, 0, 0, 0.3);

            /* Spacing - Gaps */
            --gap-sm: 10px;
            --gap-md: 15px;
            --gap-lg: 20px;

            /* Spacing - Padding */
            --padding-xs: 5px;
            --padding-sm: 10px;
            --padding-md: 12px;
            --padding-lg: 15px;
            --padding-xl: 20px;
            --padding-2xl: 30px;

            /* Spacing - Margins */
            --margin-sm: 10px;
            --margin-md: 15px;
            --margin-lg: 20px;
            --margin-xl: 30px;

            /* Border widths */
            --border-thin: 1px;
            --border-width: 2px;
            --border-thick: 3px;

            /* Border radius */
            --radius-sm: 6px;
            --radius-md: 8px;
            --radius-lg: 12px;
            --radius-xl: 16px;
            --radius-2xl: 20px;

            /* Font sizes */
            --font-xs: 0.75rem;
            --font-sm: 0.8rem;
            --font-md: 0.85rem;
            --font-base: 0.9rem;
            --font-lg: 0.95rem;
            --font-xl: 1rem;
            --font-2xl: 1.1rem;
            --font-title: 2rem;

            /* Sizes */
            --size-tile-min: 60px;
            --size-row-min: 80px;
            --size-color-sm: 80px;
            --size-color-md: 100px;
            --size-button-height: 52px;  /* Fixed height for all grid buttons */
            --size-toggle-width: 140px;
            --size-toggle-height: 40px;
            --size-toggle-slider-width: 66px;
            --size-toggle-slider-height: 32px;
            --max-width: 600px;

            /* Opacity */
            --opacity-disabled: 0.5;
            --opacity-icon: 0.8;

            /* Transform scales */
            --scale-hover: 1.05;
            --scale-hover-sm: 1.02;

            /* Animation timings */
            --transition-speed: 0.2s;
            --transition-speed-fast: 0.15s;
            --transition-speed-slow: 0.3s;
            --transition-ease: ease;
            --animation-ease-smooth: cubic-bezier(0.4, 0, 0.2, 1);

            /* Shadows */
            --shadow-focus: 0 0 0 3px var(--bg-focus-ring);
            --shadow-current: 0 0 0 3px var(--bg-current-ring);
            --shadow-modal: 0 10px 40px var(--bg-shadow);
        }

        /* === DARK MODE THEME === */
        body.dark-mode {
            /* Dark UI colors */
            --bg-color: #1a1a1a;
            --text-color: #e0e0e0;
            --text-color-secondary: #b0b0b0;
            --text-color-tertiary: #808080;
            --tile-bg: #2d2d2d;
            --border-color: #404040;
            --border-color-dark: #505050;
            --bg-overlay: rgba(0, 0, 0, 0.8);
            --bg-shadow: rgba(0, 0, 0, 0.6);

            /* Colored tiles KEEP black text (readability) */
            --text-on-color: #333;

            /* Button hover states adjusted for dark */
            --color-button-hover-bg: #3a3a3a;
            --color-button-hover-bg-alt: #454545;

            /* Keep colored backgrounds the same */
            /* --color-yellow, --color-green, etc. stay unchanged */

            /* Light color variants for borders/accents in dark mode - softer gradient */
            --color-yellow-light: #fbe88d;
            --color-green-light: #b8d87a;
            --color-blue-light: #c8d5f0;
            --color-purple-light: #d4b8db;
        }

        /* Dark mode: Light text on uncolored tiles */
        body.dark-mode .tile:not(.colored):not(.split) {
            color: var(--text-color);
        }

        /* === UTILITY CLASSES - Color backgrounds === */
        .bg-yellow { background-color: var(--color-yellow); }
        .bg-green { background-color: var(--color-green); }
        .bg-blue { background-color: var(--color-blue); }
        .bg-purple { background-color: var(--color-purple); }

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

        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, sans-serif;
            background-color: var(--bg-color);
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: flex-start;
            min-height: 100vh;
            padding: var(--padding-xl);
        }

        /* === APP HEADER - Title left, buttons right === */
        .app-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
            max-width: var(--max-width);
            margin-bottom: var(--margin-md);
        }

        .app-title {
            margin: 0;
            color: var(--text-color);
            font-size: var(--font-title);
            line-height: 40px;  /* Match button height for vertical alignment */
        }

        .header-buttons {
            display: flex;
            gap: var(--gap-sm);
            align-items: center;
        }

        /* Main game board - 4x4 grid (prevents jumping) */
        .game-board {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            /* NO grid-template-rows - let tiles determine height! */
            gap: var(--gap-sm);
            max-width: var(--max-width);
            width: 100%;
            margin-bottom: var(--margin-sm);  /* Reduced gap to Solve buttons */

            /* Visual separation - horizontal rules above and below */
            padding: var(--padding-md) 0;
            border-top: var(--border-width) solid var(--border-color);
            border-bottom: var(--border-width) solid var(--border-color);
        }

        .solved-row {
            /* Span all 4 columns of their row */
            grid-column: 1 / -1;

            border-radius: var(--radius-md);
            display: flex;
            align-items: center;
            justify-content: center;
            padding: var(--padding-xl);
            color: var(--text-on-color);  /* Black text on colored rows */
            font-weight: bold;
            font-size: var(--font-2xl);
            text-transform: uppercase;
            text-align: center;
            line-height: 1.4;

            /* Smooth fade transition */
            transition: opacity 0.6s ease;

            /* Stack order: bottom layer */
            z-index: 1;
        }

        /* Position each solved row in its grid row */
        .solved-row-yellow { grid-row: 1; background-color: var(--color-yellow); }
        .solved-row-green  { grid-row: 2; background-color: var(--color-green); }
        .solved-row-blue   { grid-row: 3; background-color: var(--color-blue); }
        .solved-row-purple { grid-row: 4; background-color: var(--color-purple); }

        /* === BUTTONS - Base grid button styles === */
        .grid-button {
            padding: var(--padding-md);
            border: var(--border-width) solid var(--border-color);
            border-radius: var(--radius-md);
            cursor: pointer;
            font-weight: bold;
            font-size: var(--font-base);
            transition: all var(--transition-speed) var(--transition-ease);
            color: var(--text-on-color);
            text-shadow: none;
            height: var(--size-button-height);  /* Fixed height, not min-height */
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .grid-button:hover:not(:disabled) {
            transform: scale(var(--scale-hover));
            border-color: var(--text-color);
        }

        .grid-button:disabled {
            opacity: var(--opacity-disabled);
            cursor: not-allowed;
            transform: none;
        }

        /* === BUTTONS - Solve grid === */
        .solve-buttons-container {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap-sm);
            max-width: var(--max-width);
            width: 100%;
            margin-bottom: var(--gap-sm);
        }

        /* === BUTTONS - Hint swatches === */
        .hint-swatches-container {
            max-width: var(--max-width);
            width: 100%;
            margin-bottom: var(--gap-sm);
        }

        .hint-instructions {
            text-align: center;
            color: var(--text-color);
            font-size: var(--font-lg);
            margin-bottom: var(--margin-sm);
            font-weight: 500;
        }

        .hint-swatches {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: var(--gap-sm);
        }

        .hint-swatch {
            padding: var(--padding-md);  /* Match solve buttons */
            border-radius: var(--radius-md);
            text-align: center;
            cursor: grab;
            font-weight: bold;
            color: var(--text-on-color);  /* Black text on colored swatches */
            text-shadow: none;  /* No shadow with black text */
            transition: all var(--transition-speed) var(--transition-ease);
            border: var(--border-thick) solid transparent;
            user-select: none;
            height: var(--size-button-height);  /* Match grid button height */
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .hint-swatch:hover {
            transform: scale(var(--scale-hover));
            border-color: var(--text-color);
        }

        /* Active hint swatch - selected for tap-to-assign */
        .hint-swatch.active {
            animation: hint-pulse 1.5s ease-in-out infinite;
            border-width: var(--border-thick);
            cursor: pointer;
        }

        /* Remove scale on hover for active swatches */
        .hint-swatch.active:hover {
            transform: none; /* No scale, prevents layout shift */
        }

        /* Pulse animation - opacity only, no layout shift */
        @keyframes hint-pulse {
            0%, 100% { opacity: 1; }
            50% { opacity: 0.7; }
        }

        /* Color-matched borders and glows for active state - softer gradient */
        .hint-swatch.bg-yellow.active {
            border-color: var(--color-yellow-dark);
            box-shadow: 0 0 0 4px rgba(212, 184, 64, 0.3);
        }

        body.dark-mode .hint-swatch.bg-yellow.active {
            border-color: var(--color-yellow-light);
            box-shadow: 0 0 0 4px rgba(251, 232, 141, 0.3);
        }

        .hint-swatch.bg-green.active {
            border-color: var(--color-green-dark);
            box-shadow: 0 0 0 4px rgba(141, 177, 80, 0.3);
        }

        body.dark-mode .hint-swatch.bg-green.active {
            border-color: var(--color-green-light);
            box-shadow: 0 0 0 4px rgba(184, 216, 122, 0.3);
        }

        .hint-swatch.bg-blue.active {
            border-color: var(--color-blue-dark);
            box-shadow: 0 0 0 4px rgba(158, 176, 216, 0.3);
        }

        body.dark-mode .hint-swatch.bg-blue.active {
            border-color: var(--color-blue-light);
            box-shadow: 0 0 0 4px rgba(200, 213, 240, 0.3);
        }

        .hint-swatch.bg-purple.active {
            border-color: var(--color-purple-dark);
            box-shadow: 0 0 0 4px rgba(168, 150, 176, 0.3);
        }

        body.dark-mode .hint-swatch.bg-purple.active {
            border-color: var(--color-purple-light);
            box-shadow: 0 0 0 4px rgba(212, 184, 219, 0.3);
        }

        .hint-swatch.used {
            opacity: var(--opacity-disabled);
            cursor: not-allowed;
            pointer-events: none;
        }

        .hint-swatch.disabled {
            cursor: not-allowed !important;
            pointer-events: none !important;
            opacity: 1 !important; /* No transparency - use disabled color directly */
        }

        .hint-swatch.bg-yellow.disabled {
            background-color: var(--color-yellow-disabled) !important;
        }

        .hint-swatch.bg-green.disabled {
            background-color: var(--color-green-disabled) !important;
        }

        .hint-swatch.bg-blue.disabled {
            background-color: var(--color-blue-disabled) !important;
        }

        .hint-swatch.bg-purple.disabled {
            background-color: var(--color-purple-disabled) !important;
        }

        .swatch-label {
            font-size: var(--font-base);
            display: block;
        }

        /* Lock icon for hint tiles */
        .tile.hint {
            position: relative;
        }

        .tile.hint::after {
            content: '🔒';
            position: absolute;
            top: var(--padding-xs);
            left: var(--padding-xs);
            font-size: var(--font-xs);
            opacity: var(--opacity-icon);
            pointer-events: auto; /* Make lock icon interactive */
            cursor: pointer;
            padding: 4px; /* Larger tap target */
            transition: opacity var(--transition-speed) var(--transition-ease);
        }

        .tile.hint::after:hover {
            opacity: 1; /* Full opacity on hover */
        }

        /* Prevent hint tiles from being interactive in Solve mode */
        .tile.hint.locked {
            cursor: not-allowed;
        }

        /* In Solve mode, lock icon not clickable */
        .tile.hint.locked::after {
            pointer-events: none;
            cursor: default;
        }

        /* === BUTTONS - Reset controls === */
        .reset-buttons-container {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--gap-sm);
            max-width: var(--max-width);
            width: 100%;
            margin-bottom: var(--gap-sm);
        }

        /* Reset buttons inherit from grid-button base with specific overrides */
        .reset-button {
            background-color: var(--tile-bg);
            color: var(--text-color);
            border-color: var(--border-color-dark);
        }

        .reset-button:hover {
            background-color: var(--color-button-hover-bg);
        }

        .reset-button.reset-all {
            background-color: var(--color-reset-all);
            color: var(--text-on-color);
            border-color: var(--color-reset-all-border);
        }

        .reset-button.reset-all:hover {
            background-color: var(--color-reset-all-hover);
        }

        .reset-button.reset-colors {
            background-color: var(--color-reset-colors);
            color: var(--text-on-color);
            border-color: var(--color-reset-colors-border);
        }

        .reset-button.reset-colors:hover {
            background-color: var(--color-reset-colors-hover);
        }

        .tile {
            aspect-ratio: 1;
            border: var(--border-width) solid var(--border-color);
            border-radius: var(--radius-md);
            font-size: var(--font-xl);
            text-align: center;
            display: flex;
            align-items: center;
            justify-content: center;
            padding: var(--padding-sm);
            background-color: var(--tile-bg);
            cursor: text;
            overflow: hidden;
            text-transform: uppercase;

            /* Allow word wrap for multi-word text */
            white-space: normal;
            word-wrap: break-word;
            overflow-wrap: break-word;

            /* But prevent breaking within words */
            word-break: keep-all;

            /* Tighter line height for wrapped text */
            line-height: 1.1;

            /* Smooth fade and reposition transitions */
            transition: opacity 0.5s ease,
                        grid-row 0.3s ease,
                        grid-column 0.3s ease,
                        border-color var(--transition-speed) var(--transition-ease),
                        box-shadow var(--transition-speed) var(--transition-ease);

            /* Stack order: TOP layer (sits above solved rows) */
            z-index: 2;

            /* Grid position set via inline styles (grid-row, grid-column) */
        }

        .tile.fading {
            opacity: 0 !important; /* Force invisible */
            z-index: -2 !important; /* Under everything */
            pointer-events: none;
            transition: opacity 0.5s ease;
        }

        .tile[contenteditable="true"]:focus {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .tile[contenteditable="true"]:empty:before {
            content: '\200B';
        }

        .tile[contenteditable="true"]:empty:focus:before {
            content: '\200B';
        }

        .tile:focus {
            outline: none;
            border-color: var(--border-focus);
            box-shadow: var(--shadow-focus);
        }

        .tile.current {
            border-color: var(--color-current);
            box-shadow: var(--shadow-current);
        }

        .tile.filled {
            cursor: pointer;
        }

        .tile.colored {
            color: var(--text-on-color) !important;  /* Black text on all colored tiles */
            font-weight: bold;
            text-shadow: none !important;  /* No shadow needed with dark text */
        }

        /* Diagonal split for two-color tiles */
        .tile.split {
            background: none !important; /* Override solid color */
            position: relative;
            overflow: hidden;
            color: var(--text-on-color) !important;  /* Black text on split tiles too */
            font-weight: bold;
            text-shadow: none !important;
        }

        .tile.split::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            z-index: -1;
            border-radius: var(--radius-md);
        }

        /* Base diagonal gradient for all split combinations (top-right to bottom-left) */
        .tile.split::before {
            background: linear-gradient(135deg, var(--split-color-1) 0%, var(--split-color-1) 50%, var(--split-color-2) 50%, var(--split-color-2) 100%);
        }

        /* Set color variables for each combination (first color = top-left, second color = bottom-right) */
        .tile.split.yellow-green::before { --split-color-1: var(--color-yellow); --split-color-2: var(--color-green); }
        .tile.split.yellow-blue::before { --split-color-1: var(--color-yellow); --split-color-2: var(--color-blue); }
        .tile.split.yellow-purple::before { --split-color-1: var(--color-yellow); --split-color-2: var(--color-purple); }
        .tile.split.green-blue::before { --split-color-1: var(--color-green); --split-color-2: var(--color-blue); }
        .tile.split.green-purple::before { --split-color-1: var(--color-green); --split-color-2: var(--color-purple); }
        .tile.split.blue-purple::before { --split-color-1: var(--color-blue); --split-color-2: var(--color-purple); }
        .tile.split.green-yellow::before { --split-color-1: var(--color-green); --split-color-2: var(--color-yellow); }
        .tile.split.blue-yellow::before { --split-color-1: var(--color-blue); --split-color-2: var(--color-yellow); }
        .tile.split.purple-yellow::before { --split-color-1: var(--color-purple); --split-color-2: var(--color-yellow); }
        .tile.split.blue-green::before { --split-color-1: var(--color-blue); --split-color-2: var(--color-green); }
        .tile.split.purple-green::before { --split-color-1: var(--color-purple); --split-color-2: var(--color-green); }
        .tile.split.purple-blue::before { --split-color-1: var(--color-purple); --split-color-2: var(--color-blue); }

        /* === QUADRANT COLOR PICKER - Overlay positioned over active tile === */
        .quadrant-picker {
            position: fixed;
            background: var(--border-color);
            border-radius: var(--radius-md);
            overflow: hidden;
            z-index: 100;
            opacity: 0;
            transform: scale(0.8);
            pointer-events: none;
            transition: opacity var(--transition-speed) var(--transition-ease),
                        transform var(--transition-speed) var(--transition-ease);
            box-shadow: 0 4px 20px rgba(0, 0, 0, 0.3);
        }

        .quadrant-picker[aria-hidden="false"] {
            opacity: 1;
            transform: scale(1);
            pointer-events: auto;
        }

        /* Absolute positioning for precise 50/50 splits */
        .quadrant-picker .quadrant {
            position: absolute;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            font-weight: bold;
            font-size: var(--font-lg);
            color: var(--text-on-color);
            text-transform: uppercase;
            border: none;
            padding: 0;
            margin: 0;
            width: calc(50% - 1px);
            height: calc(50% - 1px);
            transition: filter var(--transition-speed-fast) var(--transition-ease);
        }

        .quadrant-picker .quadrant:hover {
            filter: brightness(1.1);
        }

        .quadrant-picker .quadrant:active {
            filter: brightness(0.95);
        }

        .quadrant-picker .quadrant:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: -2px;
        }

        /* Position each quadrant precisely */
        .quadrant-picker .quadrant-yellow {
            top: 0;
            left: 0;
            background-color: var(--color-yellow);
        }
        .quadrant-picker .quadrant-green {
            top: 0;
            right: 0;
            background-color: var(--color-green);
        }
        .quadrant-picker .quadrant-blue {
            bottom: 0;
            left: 0;
            background-color: var(--color-blue);
        }
        .quadrant-picker .quadrant-purple {
            bottom: 0;
            right: 0;
            background-color: var(--color-purple);
        }

        /* Centered X button - tappable to clear colors */
        .quadrant-picker .quadrant-clear {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-size: var(--font-2xl);
            font-weight: bold;
            color: var(--text-color);
            cursor: pointer;
            z-index: 1;
            width: 36px;
            height: 36px;
            display: flex;
            align-items: center;
            justify-content: center;
            border: var(--border-width) solid var(--border-color-dark);
            background: rgba(255, 255, 255, 0.85);
            border-radius: var(--radius-sm);
            transition: background var(--transition-speed-fast) var(--transition-ease),
                        transform var(--transition-speed-fast) var(--transition-ease);
        }

        .quadrant-picker .quadrant-clear:hover,
        .quadrant-picker .quadrant-clear:active {
            background: rgba(255, 255, 255, 1);
            transform: translate(-50%, -50%) scale(1.15);
        }

        .quadrant-picker .quadrant-clear:focus-visible {
            background: rgba(255, 255, 255, 1);
            transform: translate(-50%, -50%) scale(1.15);
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: 2px;
        }

        /* Disabled quadrants (for solved colors) */
        .quadrant-picker .quadrant:disabled {
            opacity: 0.4;
            cursor: not-allowed;
            filter: grayscale(50%);
        }

        .quadrant-picker .quadrant:disabled:hover {
            filter: grayscale(50%);
        }

        /* Validation error animation */
        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            10%, 30%, 50%, 70%, 90% { transform: translateX(-5px); }
            20%, 40%, 60%, 80% { transform: translateX(5px); }
        }

        .tile.validation-error {
            animation: shake 0.5s;
            border-color: var(--color-error) !important;
        }

        .color-picker {
            display: none;
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            background: var(--tile-bg);
            padding: var(--padding-2xl);
            border-radius: var(--radius-lg);
            box-shadow: var(--shadow-modal);
            z-index: 1000;
        }

        .color-picker.active {
            display: block;
        }

        .color-picker h3 {
            margin-bottom: var(--margin-lg);
            color: var(--text-color);
            text-align: center;
        }

        .color-picker-hint {
            font-size: var(--font-md);
            color: var(--text-color-secondary);
            margin: -10px 0 var(--margin-md) 0;
            text-align: center;
            font-style: italic;
        }

        .color-options {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--gap-md);
            justify-items: center;
        }

        .color-option {
            width: var(--size-color-md);
            height: var(--size-color-md);
            border: var(--border-thick) solid var(--border-color);
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: transform var(--transition-speed) var(--transition-ease);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--text-on-color);  /* Black text on colored options */
            text-shadow: none;  /* No shadow with black text */
        }

        .color-option:hover {
            transform: scale(var(--scale-hover));
            border-color: var(--text-color);
        }

        .color-option:disabled,
        .color-option.disabled {
            cursor: not-allowed !important;
            opacity: 1 !important; /* No transparency - use disabled color directly */
            /* pointer-events kept enabled so cursor shows */
        }

        .color-option.bg-yellow:disabled,
        .color-option.bg-yellow.disabled {
            background-color: var(--color-yellow-disabled) !important;
        }

        .color-option.bg-green:disabled,
        .color-option.bg-green.disabled {
            background-color: var(--color-green-disabled) !important;
        }

        .color-option.bg-blue:disabled,
        .color-option.bg-blue.disabled {
            background-color: var(--color-blue-disabled) !important;
        }

        .color-option.bg-purple:disabled,
        .color-option.bg-purple.disabled {
            background-color: var(--color-purple-disabled) !important;
        }

        .color-option:disabled:hover,
        .color-option.disabled:hover {
            transform: none;
            border-color: var(--border-color);
        }

        .color-clear {
            width: 100%;
            margin-top: var(--margin-md);
            padding: var(--padding-md);
            background-color: var(--bg-color);
            border: var(--border-width) solid var(--border-color);
            border-radius: var(--radius-md);
            cursor: pointer;
            font-weight: bold;
            font-size: var(--font-lg);
            color: var(--text-color-secondary);
            transition: all var(--transition-speed) var(--transition-ease);
            text-align: center;
        }

        .color-clear:hover {
            background-color: var(--color-button-hover-bg-alt);
            border-color: var(--text-color-tertiary);
            transform: scale(var(--scale-hover-sm));
        }

        .color-picker-done {
            width: 100%;
            margin-top: var(--margin-sm);
            padding: var(--padding-md) var(--padding-xl);
            background-color: var(--border-focus);
            color: var(--text-on-color);  /* Black text on green background */
            border: none;
            border-radius: var(--radius-sm);
            font-weight: bold;
            cursor: pointer;
            font-size: var(--font-lg);
            transition: all var(--transition-speed) var(--transition-ease);
        }

        .color-picker-done:hover {
            background-color: var(--color-green-hover);
            transform: scale(var(--scale-hover-sm));
        }

        .color-picker-done:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        .overlay {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: var(--bg-overlay);
            z-index: 999;
        }

        .overlay.active {
            display: block;
        }

        .instructions-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            max-width: var(--max-width);
            width: 100%;
            margin-bottom: var(--gap-sm);
            gap: var(--gap-lg);
        }

        .instructions {
            color: var(--text-color-secondary);
            flex: 1;
        }

        .mode-toggle-container {
            display: none;
            align-items: center;
            gap: var(--gap-sm);
            flex-shrink: 0;
        }

        .mode-toggle-container.visible {
            display: flex;
        }

        .mode-toggle {
            position: relative;
            width: var(--size-toggle-width);
            height: var(--size-toggle-height);
            background-color: var(--color-button-hover-bg-alt);
            border-radius: var(--radius-2xl);
            cursor: pointer;
            transition: background-color var(--transition-speed-slow) var(--transition-ease);
            user-select: none;
        }

        .mode-toggle.disabled {
            cursor: not-allowed;
            /* No opacity change - slider color alone indicates disabled */
        }

        .mode-toggle.disabled .mode-toggle-slider {
            background-color: var(--text-color-tertiary) !important;  /* Subtle gray */
            color: var(--tile-bg) !important;  /* Keep text readable */
        }

        /* Pulse animation when all tiles filled - burst pattern for attention */
        /* Pattern: (3x dark→light→dark in 0.5s + 0.5s pause) × 3 cycles = 3 seconds */
        @keyframes togglePulse {
            /* Pulse 1 */
            0% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }
            8.33% { box-shadow: 0 0 0 12px rgba(76, 175, 80, 1); }
            16.67% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }

            /* Pulse 2 */
            25% { box-shadow: 0 0 0 12px rgba(76, 175, 80, 1); }
            33.33% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }

            /* Pulse 3 */
            41.67% { box-shadow: 0 0 0 12px rgba(76, 175, 80, 1); }
            50% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }

            /* Pause - stay dark until next cycle */
            100% { box-shadow: 0 0 0 0 rgba(76, 175, 80, 0); }
        }

        .mode-toggle.ready-to-solve {
            animation: togglePulse 1s linear 3;  /* 3 burst cycles = 3 seconds total */
        }

        .mode-toggle.ready-to-solve .mode-toggle-slider {
            background-color: var(--border-focus);  /* Green indicates "ready" */
        }

        .mode-toggle-slider {
            position: absolute;
            top: 4px;  /* Manually centered: (40px container - 32px slider) / 2 = 4px */
            left: var(--padding-xs);
            width: var(--size-toggle-slider-width);
            height: var(--size-toggle-slider-height);
            background-color: var(--color-current);
            border-radius: var(--radius-xl);
            transition: transform var(--transition-speed-slow) var(--transition-ease);
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--tile-bg);  /* White text on blue/green slider */
            font-weight: bold;
            font-size: var(--font-md);
        }

        .mode-toggle.assign .mode-toggle-slider {
            transform: translateX(var(--size-toggle-slider-width));
            background-color: var(--border-focus);
        }

        .mode-labels {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 0 var(--padding-lg);
            pointer-events: none;
        }

        .mode-label {
            font-size: var(--font-md);
            font-weight: bold;
            color: var(--text-color-tertiary);
            transition: color var(--transition-speed-slow) var(--transition-ease);
            position: relative;
            top: -1px;  /* Raise labels by 1px to match slider text */
        }

        .mode-toggle:not(.assign) .mode-label.input {
            opacity: 0;
        }

        .mode-toggle.assign .mode-label.assign {
            opacity: 0;
        }

        /* === ANIMATIONS === */


        @media (max-width: 600px) {
            /* Mobile: Reduce exterior padding and tile gaps by 50% */
            body {
                padding: 10px;  /* Was var(--padding-xl) = 20px */
            }

            .game-board {
                gap: 5px;  /* Was var(--gap-sm) = 10px */
            }

            /* Mobile: keep title same size, just adjust line-height for smaller buttons */
            .app-title {
                line-height: 35px;  /* Match mobile button height */
            }

            .tile {
                font-size: var(--font-md);
                padding: var(--padding-xs);
                font-weight: bold;  /* Bold all tiles on mobile for readability */
            }

            .color-option {
                width: var(--size-color-sm);
                height: var(--size-color-sm);
            }

            .instructions-container {
                flex-direction: row;  /* Keep side-by-side on mobile */
                gap: var(--gap-sm);
                align-items: center;
            }

            .instructions {
                text-align: left;
                font-size: var(--font-sm);
                flex: 1;
                min-width: 0;  /* Allow text to shrink */
                max-width: 180px;  /* Force wrap at natural break point */
                line-height: 1.3;
            }

            .solve-buttons-container {
                grid-template-columns: repeat(2, 1fr);
            }

            .hint-swatches {
                grid-template-columns: repeat(2, 1fr);
            }

            .solve-button {
                font-size: var(--font-sm);
                padding: var(--padding-sm);
            }

            .solved-row {
                font-size: var(--font-base);
                padding: var(--padding-lg);
                /* Height calculated dynamically via JS */
            }

            .reset-buttons-container {
                grid-template-columns: repeat(2, 1fr);  /* Match Solve buttons layout */
            }

            .reset-button {
                font-size: var(--font-md);
                padding: var(--padding-sm) var(--padding-xl);
            }

            .attempts-table th:nth-child(2),
            .attempts-table td:nth-child(2) {
                display: none; /* Hide color column on mobile, indicator is enough */
            }

            .attempts-table th,
            .attempts-table td {
                padding: var(--padding-sm);
                font-size: var(--font-md);
            }

            .attempts-log-header h3 {
                font-size: var(--font-xl);
            }
        }

        /* === HINTS PROMPT MODAL === */
        .hints-prompt-overlay {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            background: var(--bg-overlay);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 1000;
            padding: var(--padding-xl);
        }

        .hints-prompt-modal {
            background: var(--bg-color);
            border-radius: var(--radius-lg);
            padding: var(--padding-2xl);
            max-width: 400px;
            width: 100%;
            text-align: center;
            box-shadow: var(--shadow-modal);
        }

        .hints-prompt-modal h2 {
            margin: 0 0 var(--margin-md) 0;
            color: var(--text-color);
            font-size: var(--font-2xl);
        }

        .hints-prompt-modal p {
            margin: 0 0 var(--margin-lg) 0;
            color: var(--text-color-secondary);
            font-size: var(--font-base);
            line-height: 1.5;
        }

        .hints-prompt-buttons {
            display: flex;
            flex-direction: column;
            gap: var(--gap-sm);
        }

        .hints-prompt-btn {
            padding: var(--padding-md) var(--padding-xl);
            border: var(--border-width) solid var(--border-color);
            border-radius: var(--radius-md);
            font-size: var(--font-base);
            font-weight: bold;
            cursor: pointer;
            transition: all var(--transition-speed) var(--transition-ease);
        }

        .hints-prompt-primary {
            background-color: var(--border-focus);
            color: white;
            border-color: var(--border-focus);
        }

        .hints-prompt-primary:hover {
            filter: brightness(1.1);
        }

        .hints-prompt-secondary {
            background-color: var(--bg-color);
            color: var(--text-color);
        }

        .hints-prompt-secondary:hover {
            background-color: var(--color-button-hover-bg);
        }

        /* Focus styles for accessibility */
        .hints-prompt-btn:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: 2px;
        }

        /* Reduced motion support */
        @media (prefers-reduced-motion: reduce) {
            * {
                animation-duration: 0.01ms !important;
                animation-iteration-count: 1 !important;
                transition-duration: 0.01ms !important;
                scroll-behavior: auto !important;
            }

            /* Instant transitions for accessibility */
            .tile.fading {
                opacity: 0 !important;
                z-index: -2 !important;
            }

            .solved-row {
                transition: none;
            }

            .mode-toggle-slider {
                transition: none;
            }

            /* Disable solve animations for reduced motion */
            .tile.animating {
                animation: none;
                opacity: 0;
            }

            .solved-row.animating {
                animation: none;
                opacity: 1;
            }

            /* Disable confetti for reduced motion */
            #confettiCanvas {
                display: none !important;
            }
        }

        /* Enhanced focus indicators for accessibility */
        .tile:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        .color-option:focus-visible {
            outline: var(--border-thick) solid var(--text-color);
            outline-offset: var(--border-width);
        }

        /* High contrast focus for accessibility - darker outline on light backgrounds */
        @media (prefers-contrast: more) {
            .tile:focus-visible,
            .color-option:focus-visible,
            .grid-button:focus-visible {
                outline: 3px solid #000;
                outline-offset: 2px;
            }
        }

        .color-clear:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        .mode-toggle:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        .reset-button:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        /* === ATTEMPTS LOG === */
        .attempts-log-container {
            max-width: var(--max-width);
            width: 100%;
            margin-bottom: var(--gap-sm);
        }

        .attempts-log-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: var(--margin-md);
        }

        .attempts-log-header h3 {
            color: var(--text-color);
            font-size: var(--font-2xl);
            margin: 0;
        }

        .undo-button {
            padding: var(--padding-sm) var(--padding-lg);
            background-color: var(--border-focus);
            color: var(--tile-bg);  /* White text on green button */
            border: none;
            border-radius: var(--radius-md);
            cursor: pointer;
            font-weight: bold;
            font-size: var(--font-base);
            transition: all var(--transition-speed) var(--transition-ease);
        }

        .undo-button:hover:not(:disabled) {
            background-color: var(--color-green-hover);
            transform: scale(var(--scale-hover-sm));
        }

        .undo-button:disabled {
            background-color: var(--border-color);
            color: var(--text-color-tertiary);
            cursor: not-allowed;
            opacity: var(--opacity-disabled);
        }

        .attempts-table-wrapper {
            border-radius: var(--radius-md);
            overflow: hidden;
            border: var(--border-width) solid var(--border-color);
        }

        .attempts-table {
            width: 100%;
            border-collapse: collapse;
            background-color: var(--tile-bg);
        }

        .attempts-table thead {
            background-color: var(--bg-color);
        }

        .attempts-table th {
            padding: var(--padding-md);
            text-align: left;
            font-weight: bold;
            color: var(--text-color);
            font-size: var(--font-base);
            border-bottom: var(--border-width) solid var(--border-color);
        }

        .attempts-table th.trash-col {
            width: 40px;
            text-align: center;
        }

        .attempts-table th:nth-child(2) {
            width: 50px;
            text-align: center;
        }

        .attempts-table th:nth-child(3) {
            width: 80px;
        }

        .attempts-table th:last-child {
            width: 100px;
            text-align: center;
        }

        .attempts-table td {
            padding: var(--padding-md);
            color: var(--text-color);
            font-size: var(--font-base);
            border-bottom: var(--border-thin) solid var(--border-color);
        }

        .attempts-table td.trash-col {
            text-align: center;
            padding: var(--padding-sm);
        }

        .attempts-table td:nth-child(2) {
            text-align: center;
            font-weight: bold;
            color: var(--text-color-secondary);
        }

        .attempts-table td:last-child {
            text-align: center;
            font-size: var(--font-2xl);
        }

        .trash-button {
            background: none;
            border: none;
            font-size: 1.2rem;
            cursor: pointer;
            padding: var(--padding-xs);
            opacity: 0.6;
            transition: opacity var(--transition-speed) var(--transition-ease),
                        transform var(--transition-speed) var(--transition-ease);
            line-height: 1;
        }

        .trash-button:hover {
            opacity: 1;
            transform: scale(1.2);
        }

        .trash-button:focus-visible {
            outline: var(--border-width) solid var(--color-current);
            outline-offset: var(--border-width);
            border-radius: var(--radius-sm);
        }

        .attempts-table tbody tr:last-child td {
            border-bottom: none;
        }

        .attempts-table tbody tr:hover {
            background-color: var(--bg-color);
        }

        .color-indicator {
            display: inline-block;
            width: 20px;
            height: 20px;
            border-radius: var(--radius-sm);
            vertical-align: middle;
            margin-right: var(--margin-sm);
        }

        .attempts-empty {
            padding: var(--padding-xl);
            text-align: center;
            color: var(--text-color-secondary);
            font-style: italic;
            font-size: var(--font-base);
        }

        /* Screen reader only content */
        .sr-only {
            position: absolute;
            left: -10000px;
            width: var(--border-thin);
            height: var(--border-thin);
            overflow: hidden;
        }

        /* === CONFETTI CELEBRATION === */
        #confettiCanvas {
            position: fixed;
            top: 0;
            left: 0;
            width: 100vw;
            height: 100vh;
            pointer-events: none;
            z-index: 9999;
            display: none;
        }

        #confettiCanvas.active {
            display: block;
        }

        /* Toast notification system */
        .toast-container {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            z-index: 3000; /* Above modals */
            pointer-events: none; /* Allow clicks through container */
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: var(--gap-sm);
        }

        .toast {
            background-color: var(--text-color);
            color: var(--tile-bg);
            padding: var(--padding-xl);
            border-radius: var(--radius-lg);
            border: 3px solid #000; /* Dark border for prominence */
            box-shadow: 0 10px 40px rgba(0, 0, 0, 0.5); /* Stronger shadow */
            max-width: 500px;
            min-width: 350px;
            font-size: var(--font-lg);
            font-weight: 500;
            line-height: 1.6; /* Better line spacing */
            text-align: left;
            white-space: pre-wrap; /* Preserve line breaks */
            word-wrap: break-word;
            pointer-events: auto;
            opacity: 0;
            transform: scale(0.9);
            transition: opacity var(--transition-speed-slow) var(--transition-ease),
                        transform var(--transition-speed-slow) var(--transition-ease);
            display: flex;
            flex-direction: column;
            gap: var(--gap-md);
        }

        .toast.show {
            opacity: 1;
            transform: scale(1);
        }

        .toast.error {
            background-color: var(--color-error);
            color: var(--tile-bg);
        }

        .toast.warning {
            background-color: var(--color-warning-border);
            color: var(--text-on-color); /* Dark text on yellow background */
        }

        .toast.warning .toast-button.primary {
            background-color: #333;
            color: #ffffff; /* White text on dark button */
            border-color: #333;
        }

        .toast.warning .toast-button.primary:hover {
            background-color: #1a1a1a;
            color: #ffffff; /* Keep white text on hover */
        }

        .toast.success {
            background-color: var(--border-focus);
            color: var(--tile-bg);
        }

        /* Toast message and button layout */
        .toast-message {
            flex: 1;
        }

        .toast-buttons {
            display: flex;
            gap: var(--gap-sm);
            justify-content: flex-end;
            margin-top: var(--margin-sm);
        }

        .toast-button {
            padding: var(--padding-sm) var(--padding-lg);
            border: 2px solid var(--tile-bg);
            border-radius: var(--radius-sm);
            background-color: transparent;
            color: var(--tile-bg);
            font-weight: bold;
            font-size: var(--font-base);
            cursor: pointer;
            transition: all var(--transition-speed) var(--transition-ease);
        }

        .toast-button:hover {
            background-color: var(--tile-bg);
            color: var(--text-color);
        }

        .toast-button.primary {
            background-color: var(--tile-bg);
            color: var(--text-color);
        }

        .toast-button.primary:hover {
            background-color: var(--bg-color);
        }

        /* Mobile responsive */
        @media (max-width: 600px) {
            .toast-container {
                top: 50%;
                left: var(--padding-sm);
                right: var(--padding-sm);
                transform: translateY(-50%);
                width: auto;
            }

            .toast {
                font-size: var(--font-base);
                padding: var(--padding-lg);
                max-width: none;
                min-width: 0;
            }

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

            .toast-button {
                width: 100%;
            }
        }

        /* Help button */
        .help-button {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            border: var(--border-width) solid var(--border-color);
            background-color: var(--tile-bg);
            color: var(--text-color);
            font-size: 1.5rem;
            font-weight: bold;
            cursor: pointer;
            transition: all var(--transition-speed) var(--transition-ease);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .help-button:hover {
            transform: scale(1.1);
            border-color: var(--border-focus);
            box-shadow: 0 var(--border-width) var(--radius-md) rgba(0, 0, 0, 0.2);
        }

        .help-button:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        /* Dark mode toggle button */
        .dark-mode-toggle {
            position: relative;  /* For icon positioning */
            width: 40px;
            height: 40px;
            border-radius: 50%;
            border: var(--border-width) solid var(--border-color);
            background-color: var(--tile-bg);
            color: var(--text-color);
            font-size: 1.3rem;
            cursor: pointer;
            transition: all var(--transition-speed) var(--transition-ease);
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .dark-mode-toggle:hover {
            transform: scale(1.1);
            border-color: var(--border-focus);
            box-shadow: 0 var(--border-width) var(--radius-md) rgba(0, 0, 0, 0.2);
        }

        .dark-mode-toggle:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        .dark-mode-toggle .theme-icon {
            position: absolute;
        }

        .dark-mode-toggle .dark-icon {
            display: none;
        }

        /* Dark mode active state */
        body.dark-mode .dark-mode-toggle .light-icon {
            display: none;
        }

        body.dark-mode .dark-mode-toggle .dark-icon {
            display: block;
        }

        /* Ko-fi Header Button */
        .kofi-btn {
            width: 40px;
            height: 40px;
            border-radius: 50%;
            border: var(--border-width) solid var(--border-color);
            background-color: var(--tile-bg);
            display: flex;
            align-items: center;
            justify-content: center;
            text-decoration: none;
            font-size: var(--font-lg);
            transition: all var(--transition-speed) var(--transition-ease);
        }

        .kofi-btn:hover {
            transform: scale(1.1);
            border-color: var(--border-focus);
            box-shadow: 0 var(--border-width) var(--radius-md) rgba(0, 0, 0, 0.2);
        }

        .kofi-btn:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        /* Help Modal */
        .help-modal {
            display: none;
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background-color: rgba(0, 0, 0, 0.6);
            z-index: 10000; /* Above all toasts and confetti */
            overflow-y: auto;
            padding: var(--padding-xl);
        }

        .help-modal.active {
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .help-modal-content {
            background: var(--tile-bg);
            border-radius: var(--radius-lg);
            padding: var(--padding-2xl);
            max-width: 650px;  /* Increased from 600px to reduce wrapping */
            width: 100%;
            max-height: 90vh;
            overflow-y: auto;
            position: relative;
            box-shadow: var(--shadow-modal);
        }

        .help-close {
            position: absolute;
            top: var(--padding-lg);
            right: var(--padding-xl);
            background: none;
            border: none;
            font-size: 2.5rem;
            color: var(--text-color);
            cursor: pointer;
            line-height: 1;
            padding: 0;
            width: 40px;
            height: 40px;
            display: flex;
            align-items: center;
            justify-content: center;
            border-radius: 50%;
            transition: background-color var(--transition-speed);
        }

        .help-close:hover {
            background-color: rgba(0, 0, 0, 0.1);
        }

        .help-close:focus-visible {
            outline: var(--border-thick) solid var(--color-current);
            outline-offset: var(--border-width);
        }

        #helpModalTitle {
            margin-bottom: 25px;
            color: var(--text-color);
            font-size: 1.8rem;
        }

        .help-section {
            margin-bottom: var(--margin-xl);
        }

        .help-section h3 {
            color: var(--text-color);
            font-size: 1.2rem;
            margin-bottom: var(--margin-sm);
            border-bottom: var(--border-width) solid var(--border-color);
            padding-bottom: var(--radius-md);
        }

        .help-section p {
            color: var(--text-color);
            line-height: 1.6;
            margin-bottom: var(--margin-sm);
        }

        .help-emphasis {
            background-color: var(--color-warning-bg);
            border-left: var(--padding-xs) solid var(--color-warning-border);
            padding: var(--padding-md);
            border-radius: var(--padding-xs);
            font-weight: 500;
            font-size: var(--font-base);  /* Slightly smaller to prevent wrapping */
            line-height: 1.4;
        }

        /* Dark mode: Darker warning background for better contrast */
        body.dark-mode .help-emphasis {
            background-color: #b8860b; /* Dark goldenrod */
            border-left-color: #daa520; /* Goldenrod */
            color: #1a1a1a; /* Dark text for maximum contrast */
        }

        /* Dark mode: Light kbd elements in warning boxes */
        body.dark-mode .help-emphasis kbd {
            background-color: #f5f5f5;
            color: #1a1a1a;
            border-color: #ddd;
        }

        .help-section ol,
        .help-section ul {
            margin-left: var(--padding-xl);
            color: var(--text-color);
        }

        .help-section li {
            margin-bottom: var(--radius-md);
            line-height: 1.5;
        }

        .help-shortcuts {
            width: 100%;
            border-collapse: collapse;
        }

        .help-shortcuts tr {
            border-bottom: var(--border-thin) solid var(--border-color);
        }

        .help-shortcuts td {
            padding: var(--padding-sm);
            color: var(--text-color);
        }

        .help-shortcuts td:first-child {
            font-weight: bold;
            width: 200px;
        }

        kbd {
            background-color: var(--bg-color);
            border: var(--border-thin) solid var(--border-color);
            border-radius: var(--border-thick);
            box-shadow: 0 var(--border-thin) 0 rgba(0,0,0,0.2);
            display: inline-block;
            font-family: monospace;
            font-size: 0.9em;
            padding: var(--border-width) var(--radius-sm);
            margin: 0 var(--border-width);
        }

        /* Version info in help modal */
        .help-footer {
            margin-top: var(--margin-xl);
            padding-top: var(--margin-md);
            border-top: var(--border-thin) solid var(--border-color);
            text-align: center;
        }

        .version-info {
            color: var(--text-color-tertiary);
            font-size: var(--font-sm);
            margin: 0;
        }

        .legal-links {
            margin-top: var(--margin-sm);
            font-size: var(--font-sm);
        }

        .legal-links a {
            color: var(--text-color-secondary);
            text-decoration: none;
            transition: color var(--transition-speed) var(--transition-ease);
        }

        .legal-links a:hover {
            color: var(--border-focus);
            text-decoration: underline;
        }

        .link-separator {
            margin: 0 var(--padding-sm);
            color: var(--text-color-tertiary);
        }

        /* ========================================
           KO-FI TOAST - CLOUD OF GOOD FORTUNE
           ======================================== */

        .kofi-toast {
            position: fixed;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%) scale(0);
            z-index: 1000;
            /* Entry animation */
            animation: kofi-toast-enter 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275) forwards;
        }

        .kofi-toast.hiding {
            animation: kofi-toast-exit 0.4s ease-out forwards;
        }

        .kofi-toast[hidden] {
            display: none;
        }

        /* Animated gradient background */
        .kofi-toast-content {
            position: relative;
            background: linear-gradient(
                90deg,
                var(--color-yellow) 0%,
                var(--color-green) 12.5%,
                var(--color-blue) 25%,
                var(--color-purple) 37.5%,
                var(--color-yellow) 50%,
                var(--color-green) 62.5%,
                var(--color-blue) 75%,
                var(--color-purple) 87.5%,
                var(--color-yellow) 100%
            );
            background-size: 200% 100%;
            animation: kofi-gradient-shift 6s linear infinite, kofi-content-enter 0.3s ease-out 0.2s forwards;
            border-radius: var(--radius-xl);
            padding: var(--padding-xl) var(--padding-2xl);
            display: flex;
            align-items: center;
            gap: var(--gap-lg);
            max-width: calc(100vw - var(--padding-lg) * 2);
            /* Content fade-in delay */
            opacity: 0;
            box-shadow: 0 8px 32px rgba(0, 0, 0, 0.3);
        }

        /* Outer glow effect */
        .kofi-toast-glow {
            position: absolute;
            inset: -12px;
            background: linear-gradient(
                90deg,
                var(--color-yellow) 0%,
                var(--color-green) 12.5%,
                var(--color-blue) 25%,
                var(--color-purple) 37.5%,
                var(--color-yellow) 50%,
                var(--color-green) 62.5%,
                var(--color-blue) 75%,
                var(--color-purple) 87.5%,
                var(--color-yellow) 100%
            );
            background-size: 200% 100%;
            animation: kofi-gradient-shift 6s linear infinite;
            border-radius: calc(var(--radius-xl) + 12px);
            filter: blur(20px);
            opacity: 0.7;
            z-index: -1;
        }

        /* Sparkle decorations */
        .kofi-toast-sparkle {
            position: absolute;
            font-size: 1.5rem;
            color: white;
            opacity: 0;
            animation: kofi-sparkle 1.2s ease-in-out infinite;
            pointer-events: none;
            text-shadow: 0 0 8px rgba(255, 255, 255, 0.8), 0 0 16px rgba(255, 255, 255, 0.5);
        }

        .sparkle-1 {
            top: -18px;
            left: 15%;
            animation-delay: 0s;
        }

        .sparkle-2 {
            top: -14px;
            right: 12%;
            animation-delay: 0.3s;
        }

        .sparkle-3 {
            bottom: -16px;
            left: 25%;
            animation-delay: 0.6s;
        }

        .sparkle-4 {
            bottom: -18px;
            right: 20%;
            animation-delay: 0.9s;
        }

        /* Close button */
        .kofi-toast-close {
            position: absolute;
            top: var(--padding-sm);
            right: var(--padding-sm);
            background: rgba(255, 255, 255, 0.4);
            border: none;
            border-radius: 50%;
            width: 28px;
            height: 28px;
            font-size: var(--font-lg);
            color: var(--color-text);
            cursor: pointer;
            display: flex;
            align-items: center;
            justify-content: center;
            line-height: 1;
            transition: background var(--transition-fast);
        }

        .kofi-toast-close:hover {
            background: rgba(255, 255, 255, 0.6);
        }

        /* Toast content elements - black text on colored background */
        .kofi-toast-emoji {
            font-size: 2.5rem;
        }

        .kofi-toast-text {
            color: var(--color-text);
            font-size: var(--font-lg);
            font-weight: 600;
        }

        .kofi-toast-link {
            color: var(--color-text);
            font-weight: 700;
            font-size: var(--font-base);
            text-decoration: none;
            white-space: nowrap;
            background: rgba(255, 255, 255, 0.5);
            padding: var(--padding-sm) var(--padding-md);
            border-radius: var(--radius-md);
            transition: background var(--transition-fast);
        }

        .kofi-toast-link:hover {
            background: rgba(255, 255, 255, 0.7);
        }

        /* Keyframe Animations */
        @keyframes kofi-toast-enter {
            0% {
                transform: translate(-50%, -50%) scale(0);
                opacity: 0;
            }
            50% {
                transform: translate(-50%, -50%) scale(1.05);
            }
            100% {
                transform: translate(-50%, -50%) scale(1);
                opacity: 1;
            }
        }

        @keyframes kofi-toast-exit {
            0% {
                transform: translate(-50%, -50%) scale(1);
                opacity: 1;
            }
            100% {
                transform: translate(-50%, -50%) scale(0.9);
                opacity: 0;
            }
        }

        @keyframes kofi-content-enter {
            0% {
                opacity: 0;
            }
            100% {
                opacity: 1;
            }
        }

        @keyframes kofi-gradient-shift {
            0% {
                background-position: 0% 50%;
            }
            100% {
                background-position: 100% 50%;
            }
        }

        @keyframes kofi-sparkle {
            0%, 100% {
                opacity: 0;
                transform: scale(0.6) translateY(0);
            }
            40%, 60% {
                opacity: 1;
                transform: scale(1.2) translateY(-8px);
            }
        }

        /* Mobile: Stack vertically */
        @media (max-width: 600px) {
            .kofi-toast {
                /* Centered position maintained on mobile */
            }

            .kofi-toast-content {
                flex-direction: column;
                text-align: center;
                padding: var(--padding-lg);
                gap: var(--gap-sm);
            }

            .kofi-toast-close {
                top: var(--padding-sm);
                right: var(--padding-sm);
            }
        }

        /* Dark Mode */
        body.dark-mode .kofi-toast-close {
            color: var(--color-text);
        }

        body.dark-mode .kofi-toast-text,
        body.dark-mode .kofi-toast-link {
            color: var(--color-text);
        }

        /* Mobile responsive */
        @media (max-width: 600px) {
            .help-modal-content {
                padding: 25px;
            }

            .help-button {
                width: 35px;
                height: 35px;
                font-size: 1.3rem;
            }

            .dark-mode-toggle {
                width: 35px;
                height: 35px;
                font-size: 1.1rem;
            }

            .kofi-btn {
                width: 35px;
                height: 35px;
                font-size: 1.1rem;
            }

            #helpModalTitle {
                font-size: 1.5rem;
                margin-right: 40px; /* Space for close button */
            }

            .help-shortcuts td:first-child {
                width: var(--size-toggle-width);
            }
        }