:root {
            --primary-color: #ED1C24;
            --primary-dark: #ED1C24;
            --secondary-color: #64748b;
            --success-color: #059669;
            --danger-color: #dc2626;
            --warning-color: #d97706;
            --light-bg: #f8fafc;
            --dark-text: #1e293b;
            --border-color: #e2e8f0;
            --shadow-sm: 0 1px 2px 0 rgb(0 0 0 / 0.05);
            --shadow-md: 0 4px 6px -1px rgb(0 0 0 / 0.1), 0 2px 4px -2px rgb(0 0 0 / 0.1);
            --shadow-lg: 0 10px 15px -3px rgb(0 0 0 / 0.1), 0 4px 6px -4px rgb(0 0 0 / 0.1);
            --shadow-xl: 0 20px 25px -5px rgb(0 0 0 / 0.1), 0 8px 10px -6px rgb(0 0 0 / 0.1);
        }

        * {
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: linear-gradient(135deg, #f3f3f3 0%, #fdfbff 100%);
            min-height: 100vh;
            margin: 0;
            padding: 20px 0;
        }

        .registration-container {
            max-width: 900px;
            margin: 0 auto;
            padding: 0 15px;
        }

        .registration-card {
            background: #ffffff;
            border-radius: 20px;
            box-shadow: var(--shadow-xl);
            overflow: hidden;
            border: none;
        }

        .card-header {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            color: white;
            padding: 2rem;
            text-align: center;
            border: none;
        }

        .brand-logo {
            width: 64px;
            height: 64px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 16px;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1rem;
            backdrop-filter: blur(10px);
        }

        .brand-logo i {
            font-size: 28px;
            color: white;
        }

        .card-header h2 {
            font-size: 1.75rem;
            font-weight: 700;
            margin: 0 0 0.5rem 0;
            letter-spacing: -0.025em;
        }

        .card-header p {
            font-size: 1rem;
            opacity: 0.9;
            margin: 0;
            font-weight: 400;
        }

        .card-body {
            padding: 2.5rem;
        }

        .section-title {
            font-size: 1.125rem;
            font-weight: 600;
            color: var(--dark-text);
            margin-bottom: 1.5rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .section-title i {
            color: var(--primary-color);
            font-size: 1rem;
        }

        .form-group {
            margin-bottom: 1.5rem;
        }

        .form-label {
            font-weight: 500;
            color: var(--dark-text);
            margin-bottom: 0.5rem;
            font-size: 0.875rem;
        }

        .form-control {
            border: 2px solid var(--border-color);
            border-radius: 12px;
            padding: 0.75rem 1rem;
            font-size: 1rem;
            transition: all 0.2s ease;
            background-color: #fff;
        }

        .form-control:focus {
            border-color: var(--primary-color);
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.1);
            outline: none;
        }

        .input-group {
            position: relative;
        }

        .input-icon {
            position: absolute;
            left: 1rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--secondary-color);
            z-index: 10;
        }

        .form-control.has-icon {
            padding-left: 2.75rem;
        }

        .field-error {
            border-color: var(--danger-color) !important;
            background-color: #fef2f2 !important;
        }

        .field-error:focus {
            box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.1) !important;
        }

        .error-message {
            background: linear-gradient(135deg, #fef2f2 0%, #fee2e2 100%);
            color: var(--danger-color);
            padding: 1rem 1.25rem;
            border-radius: 12px;
            margin-bottom: 1.5rem;
            border-left: 4px solid var(--danger-color);
            font-size: 0.875rem;
            line-height: 1.5;
        }

        .success-message {
            background: linear-gradient(135deg, #ecfdf5 0%, #d1fae5 100%);
            color: var(--success-color);
            padding: 1rem 1.25rem;
            border-radius: 12px;
            margin-bottom: 1.5rem;
            border-left: 4px solid var(--success-color);
            font-size: 0.875rem;
            line-height: 1.5;
        }

        .gender-group, .checkbox-group {
            display: flex;
            gap: 1.5rem;
            margin-top: 0.5rem;
        }

        .gender-option, .checkbox-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            cursor: pointer;
        }

        .gender-option input[type="radio"],
        .checkbox-item input[type="checkbox"] {
            width: 18px;
            height: 18px;
            cursor: pointer;
        }

        .anniversary-field {
            display: none;
            opacity: 0;
            transform: translateY(-10px);
            transition: all 0.3s ease;
        }

        .anniversary-field.show {
            display: block;
            opacity: 1;
            transform: translateY(0);
        }

        .password-requirements {
            font-size: 0.8rem;
            color: var(--secondary-color);
            margin-top: 0.5rem;
            padding: 0.75rem;
            background: var(--light-bg);
            border-radius: 8px;
            border-left: 3px solid var(--primary-color);
        }

        .password-strength {
            margin-top: 0.5rem;
        }

        .strength-indicator {
            height: 4px;
            background: var(--border-color);
            border-radius: 2px;
            overflow: hidden;
            margin-top: 0.25rem;
        }

        .strength-bar {
            height: 100%;
            transition: all 0.3s ease;
            border-radius: 2px;
        }

        .strength-weak { background: var(--danger-color); width: 25%; }
        .strength-fair { background: var(--warning-color); width: 50%; }
        .strength-good { background: #10b981; width: 75%; }
        .strength-strong { background: var(--success-color); width: 100%; }

        .btn-primary {
            background: linear-gradient(135deg, var(--primary-color) 0%, var(--primary-dark) 100%);
            border: none;
            border-radius: 12px;
            padding: 0.875rem 2rem;
            font-weight: 600;
            font-size: 1rem;
            letter-spacing: 0.025em;
            transition: all 0.2s ease;
            box-shadow: var(--shadow-sm);
        }

        .btn-primary:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-md);
            background: linear-gradient(135deg, var(--primary-dark) 0%, #1e40af 100%);
        }

        .btn-primary:focus {
            box-shadow: 0 0 0 3px rgba(37, 99, 235, 0.3);
        }

        .card-footer {
            background: var(--light-bg);
            padding: 1.5rem 2.5rem;
            text-align: center;
            border-top: 1px solid var(--border-color);
        }

        .card-footer a {
            color: var(--primary-color);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.2s ease;
        }

        .card-footer a:hover {
            color: var(--primary-dark);
            text-decoration: underline;
        }

        .form-section {
            background: #f8fafc;
            padding: 1.5rem;
            border-radius: 12px;
            margin-bottom: 2rem;
            border: 1px solid var(--border-color);
        }

        @media (max-width: 768px) {
            body {
                padding: 10px 0;
            }
            
            .card-body {
                padding: 1.5rem;
            }
            
            .card-header {
                padding: 1.5rem;
            }
            
            .gender-group, .checkbox-group {
                flex-direction: column;
                gap: 1rem;
            }
            
            .registration-container {
                padding: 0 10px;
            }
        }

        @media (max-width: 576px) {
            .card-header h2 {
                font-size: 1.5rem;
            }
            
            .section-title {
                font-size: 1rem;
            }
        }