.container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 20px;
        }
        
        header {
            background: linear-gradient(135deg, var(--primary), var(--secondary));
            color: white;
            padding: 2rem 0;
            text-align: center;
            box-shadow: 0 4px 12px rgba(0, 0, 0, 0.1);
        }
        
        header h1 {
            font-size: 2.5rem;
            margin-bottom: 0.5rem;
        }
        
        header p {
            font-size: 1.1rem;
            opacity: 0.9;
        }
        
        nav {
            background-color: white;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            position: sticky;
            top: 0;
            z-index: 100;
        }
        
        .nav-container {
            display: flex;
            justify-content: center;
        }
        
        .nav-item {
            padding: 1rem 1.5rem;
            cursor: pointer;
            transition: all 0.3s ease;
            font-weight: 500;
            border-bottom: 3px solid transparent;
        }
        
        .nav-item:hover, .nav-item.active {
            color: var(--primary);
            border-bottom: 3px solid var(--primary);
        }
        
        section {
            padding: 3rem 0;
        }
        
        .section-title {
            text-align: center;
            margin-bottom: 2rem;
            color: var(--dark);
            position: relative;
        }
        
        .section-title:after {
            content: '';
            display: block;
            width: 80px;
            height: 4px;
            background: var(--accent);
            margin: 10px auto;
            border-radius: 2px;
        }
        
        .search-box {
            max-width: 500px;
            margin: 0 auto 2rem;
            position: relative;
        }
        
        .search-box input {
            width: 100%;
            padding: 12px 20px;
            border: 1px solid #ddd;
            border-radius: 30px;
            font-size: 1rem;
            box-shadow: 0 2px 10px rgba(0, 0, 0, 0.05);
            transition: all 0.3s ease;
        }
        
        .search-box input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 2px 15px rgba(74, 111, 165, 0.2);
        }
        
        .color-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 20px;
            margin-bottom: 2rem;
        }
        
        .color-card {
            background: white;
            border-radius: 8px;
            overflow: hidden;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease, box-shadow 0.3s ease;
            cursor: pointer;
        }
        
        .color-card:hover {
            transform: translateY(-5px);
            box-shadow: 0 8px 20px rgba(0, 0, 0, 0.12);
        }
        
        .color-preview {
            height: 120px;
            width: 100%;
        }
        
        .color-info {
            padding: 15px;
        }
        
        .color-name {
            font-weight: 600;
            margin-bottom: 5px;
            color: var(--dark);
        }
        
        .color-code {
            font-family: monospace;
            color: #666;
            font-size: 0.9rem;
        }
        
        .tips-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(300px, 1fr));
            gap: 25px;
        }
        
        .tip-card {
            background: white;
            border-radius: 8px;
            padding: 25px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
            transition: transform 0.3s ease;
        }
        
        .tip-card:hover {
            transform: translateY(-5px);
        }
        
        .tip-card h3 {
            color: var(--primary);
            margin-bottom: 15px;
            display: flex;
            align-items: center;
        }
        
        .tip-card h3 i {
            margin-right: 10px;
            font-size: 1.2rem;
        }
        
        .tool-section {
            background: white;
            border-radius: 8px;
            padding: 25px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.08);
            margin-bottom: 2rem;
        }
        
        .color-picker-container {
            display: flex;
            flex-wrap: wrap;
            gap: 20px;
            margin-top: 20px;
        }
        
        .color-picker {
            flex: 1;
            min-width: 200px;
        }
        
        .color-picker input {
            width: 100%;
            height: 50px;
            border: none;
            border-radius: 8px;
            cursor: pointer;
        }
        
        .color-result {
            flex: 2;
            min-width: 300px;
            display: flex;
            flex-direction: column;
            gap: 15px;
        }
        
        .color-combination {
            display: flex;
            height: 60px;
            border-radius: 8px;
            overflow: hidden;
        }
        
        .color-box {
            flex: 1;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-weight: bold;
            text-shadow: 1px 1px 2px rgba(0, 0, 0, 0.5);
        }
        
        footer {
            background: var(--dark);
            color: white;
            text-align: center;
            padding: 2rem 0;
            margin-top: 3rem;
        }
        
        .copy-message {
            position: fixed;
            bottom: 20px;
            left: 50%;
            transform: translateX(-50%);
            background: var(--success);
            color: white;
            padding: 10px 20px;
            border-radius: 30px;
            box-shadow: 0 4px 15px rgba(0, 0, 0, 0.2);
            opacity: 0;
            transition: opacity 0.3s ease;
        }
        
        .copy-message.show {
            opacity: 1;
        }
        
        @media (max-width: 768px) {
            .color-grid {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            }
            
            .tips-grid {
                grid-template-columns: 1fr;
            }
            
            .nav-container {
                flex-wrap: wrap;
            }
            
            .nav-item {
                padding: 0.8rem 1rem;
            }
        }