/* Tool Card Styles */
        .tool-card {
            background: white;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            padding: 2rem;
            margin-bottom: 1.5rem;
            box-shadow: 0 2px 8px rgba(0,0,0,0.03);
            transition: var(--transition);
        }
        
        .tool-card:hover {
            box-shadow: 0 8px 16px rgba(0,0,0,0.05);
        }
        
        .tool-header {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 25px;
            border-bottom: 1px solid var(--border-color);
        }
        
        .tool-header h2 {
            font-weight: 600;
            color: var(--primary-color);
            margin-bottom: 0.5rem;
        }
        
        .section-title {
            position: relative;
            padding-bottom: 15px;
            margin-bottom: 20px;
            font-weight: 600;
            color: var(--primary-color);
        }
        
        .section-title::after {
            content: '';
            position: absolute;
            bottom: 0;
            left: 0;
            width: 60px;
            height: 3px;
            background: var(--primary-color);
            border-radius: 3px;
        }
        
        /* Color Picker Styles */
        .color-picker-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1.5rem;
        }
        
        @media (max-width: 768px) {
            .color-picker-container {
                grid-template-columns: 1fr;
            }
        }
        
        .picker-controls {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
        }
        
        .picker-preview {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            display: flex;
            flex-direction: column;
        }
        
        .color-preview {
            width: 100%;
            height: 200px;
            border-radius: 8px;
            margin-bottom: 1.5rem;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            transition: var(--transition);
            position: relative;
            overflow: hidden;
        }
        
        .color-preview:hover {
            transform: scale(1.01);
        }
        
        .color-name {
            position: absolute;
            bottom: 15px;
            left: 15px;
            color: white;
            font-weight: 600;
            text-shadow: 0 1px 3px rgba(0,0,0,0.5);
            background: rgba(0,0,0,0.3);
            padding: 5px 10px;
            border-radius: 4px;
        }
        
        .color-values {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
        }
        
        .color-value-group {
            background-color: var(--light-gray);
            border-radius: 6px;
            padding: 1rem;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        
        .color-value-group:hover {
            transform: translateY(-3px);
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .value-label {
            font-size: 0.85rem;
            color: var(--text-muted);
            margin-bottom: 0.5rem;
            display: flex;
            align-items: center;
        }
        
        .value-label i {
            margin-right: 5px;
        }
        
        .value-content {
            font-family: 'Courier New', monospace;
            font-weight: 600;
            word-break: break-all;
            display: flex;
            align-items: center;
            justify-content: space-between;
        }
        
        .copy-btn {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            padding: 0.25rem 0.5rem;
            cursor: pointer;
            transition: var(--transition);
            margin-left: 0.5rem;
        }
        
        .copy-btn:hover {
            background-color: var(--light-gray);
            color: var(--primary-color);
        }
        
        /* HSL Wheel */
        .hsl-wheel-container {
            display: flex;
            justify-content: center;
            margin: 1.5rem 0;
            position: relative;
        }
        
        .hsl-wheel {
            width: 300px;
            height: 300px;
            border-radius: 50%;
            background: conic-gradient(
                #ff0000, #ffff00, #00ff00, #00ffff, #0000ff, #ff00ff, #ff0000
            );
            position: relative;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
        }
        
        .hsl-wheel::after {
            content: "";
            position: absolute;
            top: 50%;
            left: 50%;
            width: 120px;
            height: 120px;
            background: white;
            border-radius: 50%;
            transform: translate(-50%, -50%);
        }
        
        .wheel-selector {
            position: absolute;
            top: 50%;
            left: 50%;
            width: 20px;
            height: 20px;
            background: white;
            border: 2px solid var(--text-color);
            border-radius: 50%;
            transform: translate(-50%, -50%);
            cursor: pointer;
            z-index: 10;
        }
        
        .saturation-lightness-box {
            width: 200px;
            height: 200px;
            border-radius: 8px;
            background: linear-gradient(to right, white, var(--current-hue-color)), 
                        linear-gradient(to top, black, transparent);
            position: relative;
            box-shadow: 0 4px 12px rgba(0,0,0,0.1);
            margin: 0 auto;
        }
        
        .box-selector {
            position: absolute;
            width: 16px;
            height: 16px;
            background: transparent;
            border: 2px solid white;
            border-radius: 50%;
            transform: translate(-50%, -50%);
            cursor: pointer;
            z-index: 10;
        }
        
        /* Color Harmony */
        .color-harmony {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .harmony-card {
            background-color: white;
            border-radius: 8px;
            padding: 1rem;
            border: 1px solid var(--border-color);
            text-align: center;
            transition: var(--transition);
        }
        
        .harmony-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        
        .harmony-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .harmony-colors {
            display: flex;
            height: 100px;
            border-radius: 6px;
            overflow: hidden;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        }
        
        .harmony-color {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: 600;
            text-shadow: 0 1px 2px rgba(0,0,0,0.3);
            cursor: pointer;
            transition: var(--transition);
            position: relative;
        }
        
        .harmony-color:hover {
            flex: 1.5;
        }
        
        .harmony-color-code {
            position: absolute;
            bottom: 5px;
            left: 0;
            right: 0;
            text-align: center;
            font-size: 0.7rem;
            opacity: 0;
            transition: var(--transition);
        }
        
        .harmony-color:hover .harmony-color-code {
            opacity: 1;
        }
        
        /* Color Palettes */
        .color-palettes {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .palette-card {
            background-color: white;
            border-radius: 8px;
            overflow: hidden;
            border: 1px solid var(--border-color);
            box-shadow: 0 4px 8px rgba(0,0,0,0.05);
            transition: var(--transition);
            cursor: pointer;
        }
        
        .palette-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        
        .palette-colors {
            display: flex;
            height: 100px;
        }
        
        .palette-color {
            flex: 1;
            transition: var(--transition);
            position: relative;
        }
        
        .palette-color:hover {
            flex: 1.5;
        }
        
        .palette-color-code {
            position: absolute;
            bottom: 5px;
            left: 0;
            right: 0;
            text-align: center;
            font-size: 0.7rem;
            color: white;
            text-shadow: 0 1px 2px rgba(0,0,0,0.5);
            opacity: 0;
            transition: var(--transition);
        }
        
        .palette-color:hover .palette-color-code {
            opacity: 1;
        }
        
        .palette-info {
            padding: 1rem;
        }
        
        .palette-name {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        
        .palette-description {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        
        /* Color Psychology */
        .color-psychology {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1rem;
            margin: 1.5rem 0;
        }
        
        .psychology-card {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            text-align: center;
            transition: var(--transition);
        }
        
        .psychology-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        
        .psychology-color {
            width: 60px;
            height: 60px;
            border-radius: 50%;
            margin: 0 auto 1rem;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            box-shadow: 0 4px 8px rgba(0,0,0,0.1);
            transition: var(--transition);
        }
        
        .psychology-card:hover .psychology-color {
            transform: scale(1.1);
        }
        
        .psychology-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        
        .psychology-description {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        
        
        .social-icons {
            display: flex;
            gap: 15px;
            margin-top: 15px;
        }
        
        .social-icon {
            width: 36px;
            height: 36px;
            border-radius: 50%;
            background: var(--primary-color);
            color: white;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: var(--transition);
        }
        
        .social-icon:hover {
            transform: translateY(-3px);
            background: var(--accent-color);
        }
        
        /* Color Contrast Checker */
        .contrast-checker {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            margin: 1.5rem 0;
        }
        
        .contrast-preview {
            display: flex;
            height: 120px;
            border-radius: 8px;
            overflow: hidden;
            margin-bottom: 1rem;
        }
        
        .contrast-text {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            font-weight: bold;
        }
        
        .contrast-result {
            text-align: center;
            padding: 1rem;
            border-radius: 6px;
            font-weight: 600;
        }
        
        .contrast-pass {
            background-color: #d4edda;
            color: #155724;
        }
        
        .contrast-fail {
            background-color: #f8d7da;
            color: #721c24;
        }
        
        /* Color History */
        .history-colors {
            display: flex;
            flex-wrap: wrap;
            gap: 0.5rem;
            margin-top: 1rem;
        }
        
        .history-color {
            width: 40px;
            height: 40px;
            border-radius: 6px;
            cursor: pointer;
            border: 1px solid var(--border-color);
            transition: transform 0.3s;
            position: relative;
        }
        
        .history-color:hover {
            transform: scale(1.1);
        }
        
        .history-color-code {
            position: absolute;
            bottom: 2px;
            left: 0;
            right: 0;
            text-align: center;
            font-size: 0.6rem;
            color: white;
            text-shadow: 0 1px 1px rgba(0,0,0,0.8);
            opacity: 0;
            transition: var(--transition);
        }
        
        .history-color:hover .history-color-code {
            opacity: 1;
        }
        
        /* Design Tips */
        .design-tips {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .tip-card {
            background-color: white;
            border-radius: 8px;
            padding: 1.5rem;
            border: 1px solid var(--border-color);
            transition: var(--transition);
        }
        
        .tip-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 16px rgba(0,0,0,0.1);
        }
        
        .tip-icon {
            font-size: 1.5rem;
            color: var(--primary-color);
            margin-bottom: 1rem;
        }
        
        .tip-title {
            font-weight: 600;
            margin-bottom: 0.5rem;
        }
        
        .tip-content {
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        
        /* SEO Optimization */
        .seo-content {
            background-color: var(--light-gray);
            border-radius: 8px;
            padding: 1.5rem;
            margin: 1.5rem 0;
        }
        
        .seo-title {
            font-weight: 600;
            margin-bottom: 1rem;
            color: var(--primary-color);
        }
        
        .seo-text {
            margin-bottom: 1rem;
        }
        
        .seo-keywords {
            background: white;
            padding: 1rem;
            border-radius: 6px;
            border: 1px solid var(--border-color);
        }
        
        .keyword {
            display: inline-block;
            background: rgba(44, 125, 160, 0.1);
            color: var(--primary-color);
            padding: 3px 8px;
            border-radius: 4px;
            margin: 3px;
            font-size: 0.85rem;
        }
        
        /* HSL Sliders */
        .hsl-sliders {
            margin-top: 1.5rem;
        }
        
        .slider-container {
            margin-bottom: 1.5rem;
        }
        
        .slider-header {
            display: flex;
            justify-content: space-between;
            margin-bottom: 0.5rem;
        }
        
        .slider-value {
            font-weight: 600;
            font-family: 'Courier New', monospace;
        }
        
        .slider-track {
            height: 6px;
            background: #e9ecef;
            border-radius: 3px;
            position: relative;
        }
        
        .slider-fill {
            height: 100%;
            border-radius: 3px;
            position: absolute;
        }
        
        .slider-thumb {
            width: 20px;
            height: 20px;
            background: white;
            border: 2px solid var(--text-color);
            border-radius: 50%;
            position: absolute;
            top: 50%;
            transform: translate(-50%, -50%);
            cursor: pointer;
            z-index: 2;
        }
        
        /* Responsive Adjustments */
        @media (max-width: 992px) {
            .action-buttons {
                margin-top: 15px;
            }
        }
        
        @media (max-width: 768px) {
            .hsl-wheel-container {
                flex-direction: column;
                align-items: center;
            }
            
            .saturation-lightness-box {
                margin-top: 2rem;
            }
        }
        
        @media (max-width: 576px) {
            .tool-card {
                padding: 1.5rem;
            }
            
            .color-values {
                grid-template-columns: 1fr;
            }
        }