:root {
            --primary: #6366F1;
            --primary-light: #EEF2FF;
            --success: #10B981;
            --danger: #EF4444;
            --warning: #F59E0B;
            --info: #3B82F6;
            --dark: #1F2937;
            --light: #F9FAFB;
            --gray: #9CA3AF;
            --border-radius: 12px;
            --transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }
        
        body {
            font-family: 'Inter', sans-serif;
            max-width: 900px;
            margin: 0 auto;
            padding: 2rem;
            background-color: #f8fafc;
            color: var(--dark);
            line-height: 1.6;
        }

        h1 {
            text-align: center;
            color: var(--dark);
            margin-bottom: 2rem;
            font-weight: 700;
            font-size: 2.2rem;
        }

        .section {
            background: white;
            padding: 2rem;
            border-radius: var(--border-radius);
            margin-bottom: 2rem;
            box-shadow: 0 4px 20px rgba(0,0,0,0.04);
            border: 1px solid rgba(0,0,0,0.05);
            transition: var(--transition);
        }
        
        .section:hover {
            box-shadow: 0 8px 25px rgba(0,0,0,0.06);
            transform: translateY(-2px);
        }

        h2 {
            margin-top: 0;
            padding-bottom: 0.75rem;
            color: var(--dark);
            font-weight: 600;
            font-size: 1.4rem;
            border-bottom: 1px solid #f1f5f9;
        }

        /* Modern Basic Radio Buttons */
        .basic-container {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }
        
        .basic-container input[type="radio"] {
            appearance: none;
            width: 20px;
            height: 20px;
            border: 2px solid var(--gray);
            border-radius: 50%;
            margin-right: 10px;
            position: relative;
            cursor: pointer;
            vertical-align: middle;
            transition: var(--transition);
        }
        
        .basic-container input[type="radio"]:checked {
            border-color: var(--primary);
            background-color: var(--primary-light);
        }
        
        .basic-container input[type="radio"]:checked::after {
            content: "";
            position: absolute;
            width: 10px;
            height: 10px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            border-radius: 50%;
            background-color: var(--primary);
        }
        
        .basic-container label {
            font-weight: 500;
            cursor: pointer;
            padding-left: 5px;
            transition: var(--transition);
        }
        
        .basic-container input[type="radio"]:checked + label {
            color: var(--primary);
        }

        /* Inline Style */
        .inline-container {
            display: flex;
            flex-wrap: wrap;
            gap: 24px;
            align-items: center;
        }
        
        .inline-container input[type="radio"] {
            appearance: none;
            width: 22px;
            height: 22px;
            border: 2px solid var(--gray);
            border-radius: 50%;
            margin-right: 8px;
            position: relative;
            cursor: pointer;
            vertical-align: middle;
            transition: var(--transition);
        }
        
        .inline-container input[type="radio"]:checked {
            border-color: var(--info);
            background-color: rgba(59, 130, 246, 0.1);
        }
        
        .inline-container input[type="radio"]:checked::after {
            content: "";
            position: absolute;
            width: 12px;
            height: 12px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            border-radius: 50%;
            background-color: var(--info);
        }
        
        .inline-container input[type="radio"]:focus {
            outline: none;
            box-shadow: 0 0 0 4px rgba(59, 130, 246, 0.2);
        }
        
        .inline-container label {
            font-weight: 500;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .inline-container input[type="radio"]:checked + label {
            color: var(--info);
        }

        /* Custom Style 1 - Modern Circle Buttons */
        .custom-radio-1 {
            display: flex;
            gap: 30px;
            margin-bottom: 15px;
        }

        .custom-radio-1 input[type="radio"] {
            display: none;
        }

        .custom-radio-1 label {
            position: relative;
            padding-left: 36px;
            cursor: pointer;
            display: inline-block;
            line-height: 24px;
            font-weight: 500;
            transition: var(--transition);
        }

        .custom-radio-1 label:before {
            content: '';
            position: absolute;
            left: 0;
            top: 0;
            width: 24px;
            height: 24px;
            border: 2px solid var(--gray);
            border-radius: 50%;
            background: white;
            transition: var(--transition);
        }

        .custom-radio-1 label:hover:before {
            border-color: var(--success);
        }

        .custom-radio-1 input[type="radio"]:checked + label {
            color: var(--success);
        }

        .custom-radio-1 input[type="radio"]:checked + label:before {
            border-color: var(--success);
            background: rgba(16, 185, 129, 0.1);
        }

        .custom-radio-1 input[type="radio"]:checked + label:after {
            content: '';
            position: absolute;
            left: 6px;
            top: 6px;
            width: 12px;
            height: 12px;
            border-radius: 50%;
            background: var(--success);
            animation: pulse 0.4s;
        }

        @keyframes pulse {
            0% { transform: scale(0); opacity: 0; }
            50% { transform: scale(1.4); opacity: 0.7; }
            100% { transform: scale(1); opacity: 1; }
        }

        /* Custom Style 2 - Modern Toggle Button */
        .toggle-container {
            display: flex;
            background: #f1f5f9;
            border-radius: 12px;
            margin-bottom: 15px;
            overflow: hidden;
            position: relative;
            border: none;
            padding: 4px;
        }

        .toggle-container input[type="radio"] {
            display: none;
        }

        .toggle-container label {
            padding: 12px 20px;
            text-align: center;
            cursor: pointer;
            flex: 1;
            z-index: 1;
            font-weight: 500;
            transition: var(--transition);
            border-radius: 8px;
            position: relative;
            color: var(--gray);
        }

        .toggle-container input[type="radio"]:checked + label {
            color: white;
        }
        
        .toggle-container label:hover {
            color: var(--dark);
        }
        
        .toggle-container input[type="radio"]:nth-of-type(1):checked ~ .slide {
            transform: translateX(0);
        }
        
        .toggle-container input[type="radio"]:nth-of-type(2):checked ~ .slide {
            transform: translateX(100%);
        }
        
        .toggle-container input[type="radio"]:nth-of-type(3):checked ~ .slide {
            transform: translateX(200%);
        }
        
        .toggle-container .slide {
            position: absolute;
            height: calc(100% - 8px);
            width: calc(33.33% - 8px);
            left: 4px;
            top: 4px;
            background: var(--primary);
            border-radius: 8px;
            transition: transform 0.3s ease-out;
            box-shadow: 0 4px 15px rgba(99, 102, 241, 0.3);
        }

        /* Custom Style 3 - Modern Card Selection */
        .card-options {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
        }

        .card-radio {
            flex: 1;
            min-width: 180px;
        }

        .card-radio input[type="radio"] {
            display: none;
        }

        .card-radio label {
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            border: 2px solid #e2e8f0;
            border-radius: var(--border-radius);
            padding: 24px 15px;
            text-align: center;
            cursor: pointer;
            transition: var(--transition);
            height: 100%;
            font-weight: 500;
            position: relative;
            overflow: hidden;
        }
        
        .card-radio label::before {
            content: "";
            position: absolute;
            width: 30px;
            height: 30px;
            border-radius: 50%;
            background: var(--primary-light);
            top: -15px;
            right: -15px;
            transition: var(--transition);
            z-index: 0;
            opacity: 0;
        }
        
        .card-radio label .price {
            font-size: 1.5rem;
            font-weight: 700;
            margin: 8px 0;
            color: var(--dark);
        }
        
        .card-radio label .description {
            font-size: 0.9rem;
            color: var(--gray);
            margin-top: 6px;
            font-weight: 400;
        }

        .card-radio input[type="radio"]:checked + label {
            border-color: var(--primary);
            box-shadow: 0 10px 25px rgba(99, 102, 241, 0.15);
            transform: translateY(-5px);
        }
        
        .card-radio input[type="radio"]:checked + label::before {
            transform: scale(12);
            opacity: 0.1;
        }
        
        .card-radio input[type="radio"]:checked + label::after {
            content: "✓";
            position: absolute;
            top: 12px;
            right: 12px;
            background: var(--primary);
            color: white;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 14px;
            font-weight: bold;
        }

        /* Custom Style 4 - Modern Smiley Rating */
        .rating-container {
            display: flex;
            justify-content: space-between;
            max-width: 400px;
            margin: 0 auto;
            background: #f8fafc;
            border-radius: var(--border-radius);
            padding: 16px;
        }

        .rating-container input[type="radio"] {
            display: none;
        }

        .rating-container label {
            font-size: 28px;
            cursor: pointer;
            transition: var(--transition);
            opacity: 0.4;
            position: relative;
            filter: grayscale(100%);
        }
        
        .rating-container label:hover {
            transform: translateY(-5px);
            opacity: 0.7;
            filter: grayscale(50%);
        }

        .rating-container input[type="radio"]:checked + label {
            transform: translateY(-8px) scale(1.2);
            opacity: 1;
            filter: grayscale(0%);
        }
        
        .rating-container input[type="radio"]:checked + label::after {
            content: "";
            position: absolute;
            width: 6px;
            height: 6px;
            background: var(--primary);
            border-radius: 50%;
            bottom: -8px;
            left: 50%;
            transform: translateX(-50%);
        }

        /* Custom Style 5 - Modern Color Selection */
        .image-options {
            display: flex;
            gap: 20px;
            flex-wrap: wrap;
            justify-content: center;
        }

        .image-radio {
            position: relative;
            width: 80px;
            height: 80px;
        }

        .image-radio input[type="radio"] {
            display: none;
        }

        .image-radio label {
            display: block;
            width: 100%;
            height: 100%;
            border-radius: 16px;
            overflow: hidden;
            cursor: pointer;
            border: 3px solid transparent;
            transition: var(--transition);
            box-shadow: 0 4px 10px rgba(0,0,0,0.1);
        }
        
        .image-radio label:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 15px rgba(0,0,0,0.15);
        }

        .image-radio .color-box {
            width: 100%;
            height: 100%;
        }

        .image-radio input[type="radio"]:checked + label {
            transform: scale(1.1);
            box-shadow: 0 10px 20px rgba(0,0,0,0.2);
        }
        
        .image-radio input[type="radio"]:checked + label::after {
            content: "✓";
            position: absolute;
            width: 24px;
            height: 24px;
            background: white;
            border-radius: 50%;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            display: flex;
            align-items: center;
            justify-content: center;
            font-weight: bold;
            color: var(--dark);
            font-size: 14px;
            box-shadow: 0 2px 8px rgba(0,0,0,0.2);
        }

        /* Modern Vertical List */
        .vertical-list {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .vertical-list-item {
            background: #f8fafc;
            border-radius: var(--border-radius);
            padding: 16px;
            display: flex;
            align-items: center;
            transition: var(--transition);
        }
        
        .vertical-list-item:hover {
            background: #f1f5f9;
        }
        
        .vertical-list-item input[type="radio"] {
            appearance: none;
            width: 22px;
            height: 22px;
            border: 2px solid var(--gray);
            border-radius: 50%;
            margin-right: 16px;
            position: relative;
            cursor: pointer;
            transition: var(--transition);
        }
        
        .vertical-list-item input[type="radio"]:checked {
            border-color: var(--primary);
            background-color: var(--primary-light);
        }
        
        .vertical-list-item input[type="radio"]:checked::after {
            content: "";
            position: absolute;
            width: 10px;
            height: 10px;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            border-radius: 50%;
            background-color: var(--primary);
        }

        .vertical-list-item label {
            font-weight: 500;
            cursor: pointer;
            flex: 1;
            transition: var(--transition);
        }
        
        .vertical-list-item input[type="radio"]:checked + label {
            color: var(--primary);
        }
        
        .vertical-list-item input[type="radio"]:checked ~ .vertical-list-item {
            background: white;
            box-shadow: 0 4px 20px rgba(0,0,0,0.08);
        }