/* Reset & Base Styles */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
    user-select: none;
    -webkit-user-select: none;
    -webkit-touch-callout: none;
}

:root {
    --primary-color: #0F172A;
    --secondary-color: #1E293B;
    --accent-color: #0EA5E9;
    --accent-hover: #0284C7;
    --text-primary: #F8FAFC;
    --text-secondary: #94A3B8;
    --border-color: #334155;
    --success-color: #10B981;
    --warning-color: #F59E0B;
    --error-color: #EF4444;
    --shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.1), 0 2px 4px -1px rgba(0, 0, 0, 0.06);
    --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
    --border-radius: 8px;
    --border-radius-lg: 12px;
    --transition: all 0.2s ease;
}

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    color: var(--text-primary);
    overflow: hidden;
    height: 100vh;
    width: 100vw;
    position: fixed;
    line-height: 1.6;
    font-size: 14px;
}

.game-container {
    position: relative;
    width: 100vw;
    height: 100vh;
    display: flex;
    flex-direction: column;
}

/* Score Panel - Mobile First */
.score-panel {
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    border-top: 1px solid var(--border-color);
    padding: 12px 16px;
    display: flex;
    justify-content: center;
    align-items: center;
    position: relative;
    z-index: 100;
    flex: 1;
    min-height: 60px;
    overflow: hidden;
}



.score-item {
    display: flex;
    flex-direction: column;
    align-items: center;
    min-width: 60px;
}

.score-item.balls-item {
    position: absolute;
    left: 16px;
    min-width: auto;
}

.score-item.main-score {
    min-width: auto;
}

.score-item.main-score .score-value {
    font-size: 32px;
    font-weight: 800;
    color: var(--accent-color);
    letter-spacing: 1px;
    text-shadow: 0 0 10px rgba(6, 214, 160, 0.5);
}

.score-label {
    font-size: 10px;
    font-weight: 600;
    color: var(--text-secondary);
    letter-spacing: 0.5px;
    text-transform: uppercase;
    margin-bottom: 2px;
}

.score-value {
    font-size: 14px;
    font-weight: 700;
    color: var(--accent-color);
    letter-spacing: 0.5px;
}

.restart-btn {
    background: transparent;
    color: var(--text-primary);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 8px 12px;
    font-weight: 600;
    font-size: 11px;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    white-space: nowrap;
}

.restart-btn:hover {
    background: var(--accent-color);
    color: var(--primary-color);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.restart-btn:active {
    transform: translateY(0);
}

/* Game Canvas */
#gameCanvas {
    background: var(--primary-color);
    border: none;
    touch-action: none;
    display: block;
    image-rendering: pixelated;
    image-rendering: -moz-crisp-edges;
    image-rendering: crisp-edges;
    width: 100%;
    height: auto;
    aspect-ratio: 400 / 600;
    flex-shrink: 0;
}

/* Game Over Overlay */
.game-over-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(0, 0, 0, 0.9);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1000;
}

.game-over-content {
    background: linear-gradient(135deg, #1a1a2e, #16213e);
    padding: 40px;
    border-radius: 20px;
    text-align: center;
    border: 2px solid var(--accent-color);
    box-shadow: 0 0 30px rgba(14, 165, 233, 0.3);
    max-width: 400px;
    width: 90%;
}

.game-over-content h1 {
    color: var(--accent-color);
    font-size: 2.5em;
    margin-bottom: 30px;
    text-shadow: 0 0 20px rgba(14, 165, 233, 0.5);
    animation: glow 2s ease-in-out infinite alternate;
}

.final-scores {
    margin: 30px 0;
}

.score-line {
    display: flex;
    justify-content: space-between;
    margin: 15px 0;
    font-size: 1.2em;
    color: #ffffff;
}

.score-line span:first-child {
    color: #cccccc;
}

.score-line span:last-child {
    color: var(--accent-color);
    font-weight: bold;
}

.game-over-buttons {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 30px;
}

/* Level Select Overlay - Mobile First */
.level-select-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: rgba(15, 23, 42, 0.95);
    backdrop-filter: blur(10px);
    display: none;
    justify-content: center;
    align-items: center;
    z-index: 1000;
    padding: 20px;
}

.level-select-content {
    background: var(--secondary-color);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius-lg);
    padding: 32px 24px;
    max-width: 500px;
    width: 100%;
    max-height: 90vh;
    overflow-y: auto;
    text-align: center;
    box-shadow: var(--shadow-lg);
}

.level-select-content h1 {
    font-size: 32px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 16px;
    letter-spacing: 2px;
    text-shadow: 0 0 20px rgba(14, 165, 233, 0.5);
    animation: glow 2s ease-in-out infinite alternate;
}

.level-select-content h2 {
    color: var(--text-primary);
    margin-bottom: 8px;
    font-size: 28px;
    font-weight: 700;
    letter-spacing: 1px;
}

.level-select-content p {
    color: var(--text-secondary);
    margin-bottom: 24px;
    font-size: 16px;
    font-weight: 500;
}

.level-list {
    margin-bottom: 24px;
    max-height: 400px;
    overflow-y: auto;
}

.level-item {
    background: rgba(255, 255, 255, 0.05);
    border: 1px solid var(--border-color);
    border-radius: var(--border-radius);
    padding: 16px;
    margin-bottom: 12px;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.level-item:hover {
    background: rgba(6, 214, 160, 0.1);
    border-color: var(--accent-color);
    transform: translateY(-2px);
    box-shadow: var(--shadow);
}

.level-item.selected {
    background: rgba(6, 214, 160, 0.15);
    border-color: var(--accent-color);
    box-shadow: 0 0 0 2px rgba(6, 214, 160, 0.2);
}

.level-name {
    color: var(--text-primary);
    font-size: 18px;
    font-weight: 600;
    margin-bottom: 4px;
    letter-spacing: 0.5px;
}

.level-description {
    color: var(--text-secondary);
    font-size: 14px;
    font-weight: 500;
}

.level-select-controls {
    display: flex;
    gap: 12px;
    justify-content: center;
    flex-wrap: wrap;
}

.level-btn {
    padding: 12px 24px;
    border: 1px solid var(--border-color);
    background: transparent;
    color: var(--text-primary);
    font-size: 14px;
    font-weight: 600;
    border-radius: var(--border-radius);
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    min-width: 120px;
}

.level-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

.level-btn.primary {
    background: var(--accent-color);
    color: var(--primary-color);
    border-color: var(--accent-color);
}

.level-btn.primary:hover {
    background: var(--accent-hover);
    border-color: var(--accent-hover);
}

.level-btn:active {
    transform: translateY(0);
}

/* Scrollbar Styling */
.level-list::-webkit-scrollbar,
.level-select-content::-webkit-scrollbar {
    width: 6px;
}

.level-list::-webkit-scrollbar-track,
.level-select-content::-webkit-scrollbar-track {
    background: var(--primary-color);
    border-radius: 3px;
}

.level-list::-webkit-scrollbar-thumb,
.level-select-content::-webkit-scrollbar-thumb {
    background: var(--border-color);
    border-radius: 3px;
}

.level-list::-webkit-scrollbar-thumb:hover,
.level-select-content::-webkit-scrollbar-thumb:hover {
    background: var(--accent-color);
}

/* Mobile Responsive Design */
@media (max-width: 480px) {
    .score-panel {
        padding: 8px 12px;
        min-height: 50px;
    }

    .score-item.balls-item {
        left: 12px;
    }

    .score-item.main-score .score-value {
        font-size: 24px;
    }

    .score-label {
        font-size: 9px;
    }

    .score-value {
        font-size: 12px;
    }

    .restart-btn {
        padding: 6px 10px;
        font-size: 10px;
    }

    .level-select-content {
        padding: 24px 16px;
    }

    .level-select-content h1 {
        font-size: 24px;
        margin-bottom: 12px;
    }

    .level-select-content h2 {
        font-size: 20px;
    }

    .level-item {
        padding: 12px;
    }

    .level-name {
        font-size: 16px;
    }

    .level-description {
        font-size: 13px;
    }

    .level-btn {
        padding: 10px 18px;
        font-size: 12px;
        min-width: 100px;
    }

    .game-over-content {
        padding: 24px 16px;
    }

    .game-over-content h2 {
        font-size: 20px;
    }

    .loading-content h1 {
        font-size: 32px;
        margin-bottom: 30px;
    }

    .loading-text {
        font-size: 16px;
    }

    .loading-percentage {
        font-size: 20px;
    }

    .loading-details {
        margin-top: 20px;
        padding: 15px;
    }

    .loading-item-name {
        font-size: 14px;
    }
}

/* Tablet Responsive Design */
@media (min-width: 481px) and (max-width: 768px) {
    .score-panel {
        padding: 10px 16px;
        min-height: 55px;
    }

    .score-item.main-score .score-value {
        font-size: 36px;
    }

    .score-value {
        font-size: 15px;
    }

    .level-select-content {
        padding: 28px 20px;
    }

    .level-select-content h1 {
        font-size: 28px;
    }

    .level-select-content h2 {
        font-size: 24px;
    }
}

/* Desktop Responsive Design */
@media (min-width: 769px) {
    .score-panel {
        padding: 12px 20px;
        min-height: 65px;
    }

    .score-item.balls-item {
        left: 20px;
    }

    .score-item.main-score .score-value {
        font-size: 42px;
    }

    .score-label {
        font-size: 11px;
    }

    .score-value {
        font-size: 18px;
    }

    .restart-btn {
        padding: 10px 16px;
        font-size: 12px;
    }

    .level-select-content {
        padding: 40px 32px;
    }

    .level-select-content h1 {
        font-size: 36px;
    }

    .level-select-content h2 {
        font-size: 28px;
    }

    .level-item {
        padding: 20px;
    }

    .level-name {
        font-size: 20px;
    }

    .level-description {
        font-size: 15px;
    }

    .level-btn {
        padding: 14px 28px;
        font-size: 15px;
        min-width: 140px;
    }

    .game-over-content {
        padding: 40px 32px;
    }

    .game-over-content h2 {
        font-size: 28px;
    }

    .loading-content h1 {
        font-size: 56px;
    }

    .loading-text {
        font-size: 20px;
    }

    .loading-percentage {
        font-size: 28px;
    }

    .loading-item-name {
        font-size: 18px;
    }
}

/* Large Desktop */
@media (min-width: 1200px) {
    .score-panel {
        padding: 16px 24px;
        min-height: 70px;
    }

    .score-item.balls-item {
        left: 24px;
    }

    .score-item.main-score .score-value {
        font-size: 48px;
    }

    .score-value {
        font-size: 20px;
    }

    .restart-btn {
        padding: 12px 20px;
        font-size: 13px;
    }

    .level-select-content h1 {
        font-size: 40px;
    }

    .level-select-content h2 {
        font-size: 32px;
    }

    .level-btn {
        padding: 16px 32px;
        font-size: 16px;
        min-width: 160px;
    }
}

/* Landscape orientation adjustments */
@media (orientation: landscape) and (max-height: 500px) {
    .score-panel {
        padding: 6px 12px;
        min-height: 40px;
    }

    .score-item.balls-item {
        left: 12px;
    }

    .score-item.main-score .score-value {
        font-size: 20px;
    }

    .score-value {
        font-size: 14px;
    }

    .restart-btn {
        padding: 4px 8px;
        font-size: 10px;
    }

    .level-select-content {
        padding: 20px 16px;
        max-height: 85vh;
    }

    .level-select-content h1 {
        font-size: 18px;
        margin-bottom: 8px;
    }

    .level-select-content h2 {
        font-size: 16px;
        margin-bottom: 6px;
    }

    .level-item {
        padding: 8px 12px;
    }

    .level-name {
        font-size: 14px;
    }

    .level-description {
        font-size: 12px;
    }
}

/* High DPI screens */
@media (-webkit-min-device-pixel-ratio: 2), (min-resolution: 2dppx) {
    #gameCanvas {
        image-rendering: auto;
    }
}

/* Accessibility improvements */
@media (prefers-reduced-motion: reduce) {
    * {
        animation-duration: 0.01ms !important;
        animation-iteration-count: 1 !important;
        transition-duration: 0.01ms !important;
    }
}

/* Focus states for accessibility */
.restart-btn:focus,
.level-btn:focus,
.level-item:focus {
    outline: 2px solid var(--accent-color);
    outline-offset: 2px;
}

/* Loading state */
.loading {
    pointer-events: none;
    opacity: 0.6;
}

/* Tap to Start Screen */
.tap-to-start-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 2000;
    animation: fadeIn 0.5s ease-in-out;
}

.tap-to-start-content {
    text-align: center;
    padding: 40px;
    animation: slideUp 0.8s ease-out;
}

.tap-to-start-content h1 {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 30px;
    letter-spacing: 3px;
    text-shadow: 0 0 30px rgba(14, 165, 233, 0.6);
    animation: glow 2s ease-in-out infinite alternate;
}

.tap-instruction {
    font-size: 24px;
    color: var(--text-secondary);
    font-weight: 500;
    letter-spacing: 1px;
    animation: pulse 2s ease-in-out infinite;
    cursor: pointer;
    user-select: none;
}

.tap-instruction:hover {
    color: var(--accent-color);
    transform: scale(1.05);
    transition: var(--transition);
}

/* Loading Screen */
.loading-overlay {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    background: linear-gradient(135deg, var(--primary-color) 0%, var(--secondary-color) 100%);
    display: flex;
    justify-content: center;
    align-items: center;
    z-index: 1500;
}

.loading-content {
    text-align: center;
    padding: 40px;
    max-width: 500px;
    width: 90%;
}

.loading-content h1 {
    font-size: 48px;
    font-weight: 700;
    color: var(--accent-color);
    margin-bottom: 40px;
    letter-spacing: 3px;
    text-shadow: 0 0 30px rgba(14, 165, 233, 0.6);
    animation: glow 2s ease-in-out infinite alternate;
}

.loading-bar-container {
    margin: 30px 0;
    position: relative;
}

.loading-bar {
    width: 100%;
    height: 8px;
    background: var(--border-color);
    border-radius: 4px;
    overflow: hidden;
    position: relative;
}

.loading-bar::after {
    content: '';
    position: absolute;
    top: 0;
    left: 0;
    height: 100%;
    background: linear-gradient(90deg, var(--accent-color), var(--accent-hover));
    width: 0%;
    transition: width 0.3s ease;
    border-radius: 4px;
}

.loading-percentage {
    font-size: 24px;
    color: var(--accent-color);
    font-weight: 700;
    margin-top: 15px;
    letter-spacing: 1px;
}

.loading-details {
    background: rgba(255, 255, 255, 0.05);
    border-radius: var(--border-radius);
    padding: 20px;
    margin-top: 30px;
    border: 1px solid var(--border-color);
}

.loading-item {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin: 10px 0;
    padding: 8px 0;
}

.loading-item-name {
    color: var(--text-primary);
    font-weight: 600;
    font-size: 16px;
    letter-spacing: 0.5px;
}

.loading-item-status {
    font-size: 20px;
}

/* Animations */
@keyframes glow {
    from {
        text-shadow: 0 0 20px rgba(14, 165, 233, 0.4);
    }
    to {
        text-shadow: 0 0 30px rgba(14, 165, 233, 0.8), 0 0 40px rgba(14, 165, 233, 0.6);
    }
}

@keyframes pulse {
    0%, 100% {
        opacity: 0.7;
        transform: scale(1);
    }
    50% {
        opacity: 1;
        transform: scale(1.02);
    }
}

@keyframes fadeIn {
    from {
        opacity: 0;
    }
    to {
        opacity: 1;
    }
}

@keyframes slideUp {
    from {
        opacity: 0;
        transform: translateY(30px);
    }
    to {
        opacity: 1;
        transform: translateY(0);
    }
}

/* Mobile responsive for tap-to-start */
@media (max-width: 480px) {
    .tap-to-start-content h1 {
        font-size: 32px;
        margin-bottom: 20px;
    }

    .tap-instruction {
        font-size: 18px;
    }

    .loading-content h1 {
        font-size: 32px;
        margin-bottom: 30px;
    }

    .loading-percentage {
        font-size: 20px;
    }

    .loading-item-name {
        font-size: 14px;
    }
}

@media (min-width: 769px) {
    .tap-to-start-content h1 {
        font-size: 56px;
    }

    .tap-instruction {
        font-size: 28px;
    }
}

/* Game UI Elements */
.game-ui {
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    pointer-events: none;
    z-index: 50;
}

.flipper-zones {
    display: flex;
    height: 100px;
    pointer-events: auto;
}

.flipper-zone {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    background: rgba(0, 0, 0, 0.1);
    cursor: pointer;
    user-select: none;
    transition: background-color 0.1s ease;
}

.flipper-zone:active {
    background: rgba(6, 214, 160, 0.2);
}

.flipper-hint {
    font-size: 24px;
    font-weight: bold;
    color: rgba(255, 255, 255, 0.3);
    pointer-events: none;
}

/* Game Over Overlay Updates */
.game-over-content h1 {
    color: var(--accent-color);
    font-size: 2.5em;
    margin-bottom: 30px;
    text-shadow: 0 0 20px rgba(14, 165, 233, 0.5);
    animation: glow 2s ease-in-out infinite alternate;
}

.final-stats {
    margin: 30px 0;
}

.stat {
    display: flex;
    justify-content: space-between;
    margin: 15px 0;
    font-size: 1.2em;
    color: var(--text-primary);
}

.stat-label {
    color: var(--text-secondary);
}

.stat-value {
    color: var(--accent-color);
    font-weight: bold;
}

.game-over-controls {
    display: flex;
    flex-direction: column;
    gap: 15px;
    margin-top: 30px;
}

.game-over-controls .restart-btn,
.game-over-controls .menu-btn,
.game-over-controls .farcaster-btn {
    padding: 12px 24px;
    font-weight: 600;
    font-size: 14px;
    cursor: pointer;
    transition: var(--transition);
    text-transform: uppercase;
    letter-spacing: 0.5px;
    border-radius: var(--border-radius);
    width: 100%;
    box-sizing: border-box;
    text-align: center;
}

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

.menu-btn:hover {
    background: rgba(255, 255, 255, 0.1);
    border-color: var(--accent-color);
    transform: translateY(-1px);
}

/* Community contact text */
.community-contact {
    margin-top: 25px;
    padding: 20px 15px 15px;
    border-top: 1px solid rgba(255, 255, 255, 0.15);
    text-align: center;
    background: rgba(6, 214, 160, 0.05);
    border-radius: 8px;
    border: 1px solid rgba(6, 214, 160, 0.2);
}

.community-contact p {
    color: var(--accent-color);
    font-size: 15px;
    font-weight: 600;
    margin: 4px 0;
    letter-spacing: 0.5px;
    text-shadow: 0 0 10px rgba(6, 214, 160, 0.3);
}

.community-contact p:first-child {
    font-size: 16px;
    margin-bottom: 8px;
}

/* Mobile responsive for community contact */
@media (max-width: 480px) {
    .community-contact p {
        font-size: 13px;
    }
    
    .community-contact p:first-child {
        font-size: 14px;
    }
}

/* Utility classes */
.hidden {
    display: none !important;
}

.visible {
    display: block !important;
}

.flex-center {
    display: flex;
    justify-content: center;
    align-items: center;
}
.wall-mode-buttons {
    display: flex;
    gap: 5px;
}

.wall-mode-btn {
    padding: 5px 10px;
    border: 1px solid #444;
    background: #333;
    color: white;
    cursor: pointer;
    font-size: 12px;
}

.wall-mode-btn.active {
    background: #555;
    border-color: #666;
}

.shape-buttons {
    display: flex;
    gap: 5px;
}

.shape-btn {
    padding: 5px 10px;
    border: 1px solid #444;
    background: #333;
    color: white;
    cursor: pointer;
    font-size: 12px;
}

.shape-btn.active {
    background: #555;
    border-color: #666;
}

/* 🎯 Farcaster Actions Section */
.farcaster-actions {
    margin-top: 20px;
    padding-top: 20px;
    border-top: 1px solid rgba(255, 255, 255, 0.2);
    display: flex;
    flex-direction: column;
    gap: 12px;
}

.farcaster-btn {
    background: linear-gradient(135deg, #7C3AED, #5B21B6);
    color: white;
    border: none;
    border-radius: 8px;
    padding: 12px 20px;
    font-weight: 700;
    font-size: 12px;
    cursor: pointer;
    transition: all0.3s ease;
    text-transform: uppercase;
    letter-spacing: 0.5px;
    position: relative;
    overflow: hidden;
}

.farcaster-btn:hover {
    transform: translateY(-2px);
    box-shadow: 0 6px 20px rgba(124, 58, 237, 0.4);
}

.farcaster-btn:active {
    transform: translateY(0);
}

/* Специальные стили для кнопки доната */
.donate-btn {
    background: linear-gradient(135deg, #F59E0B, #D97706);
    position: relative;
    animation: donateGlow 2s ease-in-out infinite alternate;
}

.donate-btn:hover {
    box-shadow: 0 6px 20px rgba(245, 158, 11, 0.5);
    transform: translateY(-2px) scale(1.02);
}

.share-btn {
    background: linear-gradient(135deg, #06B6D4, #0891B2);
}

.share-btn:hover {
    box-shadow: 0 6px 20px rgba(6, 182, 212, 0.4);
}

.favorite-btn {
    background: linear-gradient(135deg, #8B5CF6, #7C3AED);
}

.favorite-btn:hover {
    box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
}

/* Анимация для кнопки доната */
@keyframes donateGlow {
    from {
        box-shadow: 0 0 20px rgba(245, 158, 11, 0.3);
    }
    to {
        box-shadow: 0 0 30px rgba(245, 158, 11, 0.6), 0 0 40px rgba(245, 158, 11, 0.4);
    }
}

/* Адаптивность для мобильных */
@media (max-width: 480px) {
    .farcaster-btn {
        padding: 10px 16px;
        font-size: 11px;
    }

    .farcaster-actions {
        gap: 10px;
    }
}

/* Стили для Farcaster элементов */
#farcasterUserInfo {
    margin: 15px 0;
    text-align: center;
    color: #0EA5E9;
    font-size: 14px;
    background: rgba(0, 0, 0, 0.3);
    padding: 10px;
    border-radius: 8px;
}

#farcasterUserInfo img {
    display: block;
    margin: 0 auto 10px;
    border-radius: 50%;
    border: 2px solid var(--accent-color);
}

/* Replaced all instances of green color references in text-shadow properties with blue color references. */