/* Variables CSS Premium */
        :root {
            --primary-blue: #007bff;
            --secondary-teal: #17a2b8;
            --success-green: #28a745;
            --light-green: #20c997;
            --warning-yellow: #ffc107;
            --dark-blue: #0056b3;
            --glass-bg: rgba(255, 255, 255, 0.1);
            --glass-border: rgba(255, 255, 255, 0.2);
            --text-primary: #2d3748;
            --text-secondary: #4a5568;
            --text-light: #718096;
            --shadow-light: 0 4px 6px rgba(0, 0, 0, 0.07);
            --shadow-medium: 0 10px 25px rgba(0, 0, 0, 0.1);
            --shadow-heavy: 0 20px 40px rgba(0, 0, 0, 0.15);
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: var(--text-primary);
            background-size: 400% 400%;
            animation: gradientShift 15s ease infinite;
            min-height: 100vh;
            color: var(--text-primary);
            line-height: 1.6;
        }

        @keyframes gradientShift {
            0% { background-position: 0% 50%; }
            50% { background-position: 100% 50%; }
            100% { background-position: 0% 50%; }
        }

        /* Particles Background */
        .particles-bg {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            pointer-events: none;
            z-index: 1;
            background-image: 
                radial-gradient(circle at 25% 25%, rgba(255, 255, 255, 0.1) 1px, transparent 1px),
                radial-gradient(circle at 75% 75%, rgba(255, 255, 255, 0.08) 1px, transparent 1px);
            background-size: 100px 100px, 80px 80px;
            animation: particlesMove 20s linear infinite;
        }

        @keyframes particlesMove {
            0% { transform: translate(0, 0); }
            100% { transform: translate(-100px, -100px); }
        }

        /* Container Premium */
        .calculator-container {
            position: relative;
            z-index: 10;
            max-width: 900px;
            margin: 0 auto;
            padding: 2rem 1rem;
        }

        /* Main Card Ultra Premium */
        .calculator-card {
            background: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(30px);
            border-radius: 32px;
            box-shadow: 
                0 25px 50px rgba(0, 0, 0, 0.15),
                0 0 0 1px rgba(255, 255, 255, 0.2),
                inset 0 1px 0 rgba(255, 255, 255, 0.3);
            border: none;
            overflow: hidden;
            position: relative;
        }

        .calculator-card::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--primary-blue), var(--secondary-teal), var(--success-green), var(--light-green));
            animation: topBorderFlow 5s ease infinite;
        }

        @keyframes topBorderFlow {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 1; }
        }

        /* Header Premium */
        .calculator-header {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-teal) 100%);
            padding: 3rem 2rem;
            text-align: center;
            position: relative;
            overflow: hidden;
        }

        .calculator-header::before {
            content: '';
            position: absolute;
            top: -50%;
            left: -50%;
            width: 200%;
            height: 200%;
            background: radial-gradient(circle, rgba(255, 255, 255, 0.1), transparent);
            animation: headerGlow 4s ease-in-out infinite;
        }

        @keyframes headerGlow {
            0%, 100% { transform: scale(1) rotate(0deg); opacity: 0.5; }
            50% { transform: scale(1.1) rotate(2deg); opacity: 0.8; }
        }

        .header-icon {
            width: 80px;
            height: 80px;
            background: rgba(255, 255, 255, 0.2);
            border-radius: 50%;
            display: inline-flex;
            align-items: center;
            justify-content: center;
            margin-bottom: 1.5rem;
            position: relative;
            z-index: 2;
            animation: iconFloat 3s ease-in-out infinite;
        }

        @keyframes iconFloat {
            0%, 100% { transform: translateY(0px); }
            50% { transform: translateY(-8px); }
        }

        .header-icon i {
            font-size: 2.5rem;
            color: white;
            animation: iconSpin 4s linear infinite;
        }

        @keyframes iconSpin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        .calculator-title {
            font-family: 'Poppins', sans-serif;
            font-size: clamp(1.8rem, 4vw, 2.5rem);
            font-weight: 700;
            color: white;
            margin-bottom: 1rem;
            position: relative;
            z-index: 2;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.2);
        }

        .calculator-subtitle {
            font-size: 1.1rem;
            color: rgba(255, 255, 255, 0.9);
            margin-bottom: 2rem;
            position: relative;
            z-index: 2;
            max-width: 600px;
            margin-left: auto;
            margin-right: auto;
        }

        /* Progress Bar */
        .progress-container {
            background: rgba(255, 255, 255, 0.2);
            border-radius: 20px;
            padding: 0.5rem;
            margin-top: 2rem;
            position: relative;
            z-index: 2;
        }

        .progress-bar-custom {
            background: linear-gradient(90deg, var(--success-green), var(--light-green));
            height: 8px;
            border-radius: 16px;
            transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
            position: relative;
            overflow: hidden;
        }

        .progress-bar-custom::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.4), transparent);
            animation: progressShine 2s ease infinite;
        }

        @keyframes progressShine {
            0% { left: -100%; }
            50% { left: 100%; }
            100% { left: -100%; }
        }

        /* Form Sections Premium */
        .calculator-body {
            padding: 3rem 2rem;
        }

        .form-section {
            background: rgba(255, 255, 255, 0.7);
            backdrop-filter: blur(15px);
            border-radius: 24px;
            padding: 2rem;
            margin-bottom: 2rem;
            border: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: var(--shadow-medium);
            position: relative;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .form-section::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 3px;
            background: linear-gradient(90deg, var(--primary-blue), var(--secondary-teal));
            transform: scaleX(0);
            transition: transform 0.3s ease;
        }

        .form-section:hover::before {
            transform: scaleX(1);
        }

        .form-section:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-heavy);
        }

        .section-header {
            display: flex;
            align-items: center;
            gap: 1rem;
            margin-bottom: 2rem;
        }

        .section-icon {
            width: 50px;
            height: 50px;
            background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
            border-radius: 16px;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            font-size: 1.3rem;
            box-shadow: var(--shadow-light);
        }

        .section-title {
            font-family: 'Poppins', sans-serif;
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0;
        }

        /* Form Controls Premium */
        .form-group-premium {
            margin-bottom: 1.5rem;
            position: relative;
        }

        .form-label-premium {
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 0.75rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            font-size: 0.95rem;
        }

        .form-control-premium,
        .form-select-premium {
            background: rgba(255, 255, 255, 0.9);
            border: 2px solid rgba(0, 123, 255, 0.2);
            border-radius: 12px;
            padding: 0.75rem 1rem;
            font-size: 1rem;
            font-weight: 500;
            color: var(--text-primary);
            transition: all 0.3s ease;
            backdrop-filter: blur(10px);
        }

        .form-control-premium:focus,
        .form-select-premium:focus {
            border-color: var(--primary-blue);
            box-shadow: 0 0 0 0.2rem rgba(0, 123, 255, 0.15);
            background: rgba(255, 255, 255, 1);
            outline: none;
        }

        .form-control-premium::placeholder {
            color: var(--text-light);
            font-weight: 400;
        }

        /* Range Slider Premium */
        .range-container {
            position: relative;
            margin: 1rem 0;
        }

        .range-input {
            width: 100%;
            height: 6px;
            border-radius: 5px;
            background: linear-gradient(90deg, #e2e8f0, #cbd5e0);
            outline: none;
            -webkit-appearance: none;
            appearance: none;
        }

        .range-input::-webkit-slider-thumb {
            appearance: none;
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
            cursor: pointer;
            border: 2px solid white;
            box-shadow: var(--shadow-light);
        }

        .range-input::-moz-range-thumb {
            width: 20px;
            height: 20px;
            border-radius: 50%;
            background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
            cursor: pointer;
            border: 2px solid white;
            box-shadow: var(--shadow-light);
        }

        .range-labels {
            display: flex;
            justify-content: space-between;
            margin-top: 0.5rem;
            font-size: 0.85rem;
            color: var(--text-light);
        }

        /* Switches Premium */
        .switch-container {
            display: flex;
            align-items: center;
            justify-content: space-between;
            padding: 1rem;
            background: rgba(255, 255, 255, 0.5);
            border-radius: 12px;
            margin-bottom: 1rem;
            transition: all 0.3s ease;
        }

        .switch-container:hover {
            background: rgba(255, 255, 255, 0.7);
        }

        .switch {
            position: relative;
            display: inline-block;
            width: 60px;
            height: 34px;
        }

        .switch input {
            opacity: 0;
            width: 0;
            height: 0;
        }

        .slider {
            position: absolute;
            cursor: pointer;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: #ccc;
            transition: 0.3s;
            border-radius: 34px;
        }

        .slider:before {
            position: absolute;
            content: "";
            height: 26px;
            width: 26px;
            left: 4px;
            bottom: 4px;
            background: white;
            transition: 0.3s;
            border-radius: 50%;
            box-shadow: var(--shadow-light);
        }

        input:checked + .slider {
            background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
        }

        input:checked + .slider:before {
            transform: translateX(26px);
        }

        /* Calculate Button Premium */
        .calculate-section {
            text-align: center;
            margin: 3rem 0;
        }

        .btn-calculate {
            background: linear-gradient(135deg, var(--primary-blue) 0%, var(--secondary-teal) 100%);
            border: none;
            border-radius: 50px;
            padding: 1rem 3rem;
            font-family: 'Poppins', sans-serif;
            font-size: 1.2rem;
            font-weight: 600;
            color: white;
            cursor: pointer;
            transition: all 0.4s cubic-bezier(0.175, 0.885, 0.32, 1.275);
            box-shadow: 0 8px 25px rgba(0, 123, 255, 0.3);
            position: relative;
            overflow: hidden;
            text-transform: uppercase;
            letter-spacing: 1px;
        }

        .btn-calculate::before {
            content: '';
            position: absolute;
            top: 0;
            left: -100%;
            width: 100%;
            height: 100%;
            background: linear-gradient(90deg, transparent, rgba(255, 255, 255, 0.2), transparent);
            transition: left 0.5s ease;
        }

        .btn-calculate:hover::before {
            left: 100%;
        }

        .btn-calculate:hover {
            transform: translateY(-3px) scale(1.05);
            box-shadow: 0 15px 35px rgba(0, 123, 255, 0.4);
        }

        .btn-calculate:active {
            transform: translateY(-1px) scale(1.02);
        }

        /* Results Section Premium */
        .results-container {
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(20px);
            border-radius: 24px;
            padding: 2.5rem;
            margin-top: 2rem;
            border: 1px solid rgba(255, 255, 255, 0.3);
            box-shadow: var(--shadow-heavy);
            text-align: center;
            position: relative;
            overflow: hidden;
            transform: scale(0.9);
            opacity: 0;
            transition: all 0.5s cubic-bezier(0.175, 0.885, 0.32, 1.275);
        }

        .results-container.show {
            transform: scale(1);
            opacity: 1;
        }

        .results-container::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            height: 4px;
            background: linear-gradient(90deg, var(--success-green), var(--light-green));
            animation: resultsBorderGlow 2s ease infinite;
        }

        @keyframes resultsBorderGlow {
            0%, 100% { opacity: 0.5; }
            50% { opacity: 1; }
        }

        .result-main {
            font-size: 3rem;
            font-weight: 800;
            background: linear-gradient(135deg, var(--success-green), var(--light-green));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            background-clip: text;
            margin-bottom: 1rem;
            text-shadow: 0 2px 10px rgba(0, 0, 0, 0.1);
        }

        .result-subtitle {
            font-size: 1.2rem;
            color: var(--text-secondary);
            margin-bottom: 2rem;
        }

        .result-details {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 1.5rem;
            margin-top: 2rem;
        }

        .detail-card {
            background: rgba(255, 255, 255, 0.7);
            border-radius: 16px;
            padding: 1.5rem;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.3);
            transition: all 0.3s ease;
        }

        .detail-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .detail-icon {
            width: 40px;
            height: 40px;
            background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: white;
            margin: 0 auto 1rem;
            font-size: 1.1rem;
        }

        .detail-value {
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-primary);
            margin-bottom: 0.25rem;
        }

        .detail-label {
            font-size: 0.9rem;
            color: var(--text-light);
            font-weight: 500;
        }

        /* Equipment Recommendations */
        .equipment-recommendations {
            margin-top: 2rem;
            padding-top: 2rem;
            border-top: 2px dashed rgba(0, 123, 255, 0.2);
        }

        .equipment-title {
            font-size: 1.3rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1.5rem;
            text-align: center;
        }

        .equipment-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(250px, 1fr));
            gap: 1rem;
        }

        .equipment-card {
            background: rgba(255, 255, 255, 0.8);
            border-radius: 12px;
            padding: 1.5rem;
            border: 2px solid transparent;
            transition: all 0.3s ease;
            cursor: pointer;
        }

        .equipment-card.recommended {
            border-color: var(--success-green);
            background: rgba(40, 167, 69, 0.1);
        }

        .equipment-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-medium);
        }

        .equipment-btu {
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--primary-blue);
            margin-bottom: 0.5rem;
        }

        .equipment-details {
            font-size: 0.9rem;
            color: var(--text-secondary);
        }

        .recommended-badge {
            background: linear-gradient(135deg, var(--success-green), var(--light-green));
            color: white;
            padding: 0.25rem 0.75rem;
            border-radius: 20px;
            font-size: 0.8rem;
            font-weight: 600;
            display: inline-block;
            margin-top: 0.5rem;
        }

        /* Contact CTA */
        .contact-cta {
            background: linear-gradient(135deg, rgba(0, 123, 255, 0.1), rgba(23, 162, 184, 0.1));
            border-radius: 20px;
            padding: 2rem;
            margin-top: 2rem;
            text-align: center;
            backdrop-filter: blur(10px);
            border: 1px solid rgba(255, 255, 255, 0.2);
        }

        .cta-title {
            font-size: 1.4rem;
            font-weight: 600;
            color: var(--text-primary);
            margin-bottom: 1rem;
        }

        .cta-subtitle {
            color: var(--text-secondary);
            margin-bottom: 2rem;
        }

        .contact-buttons {
            display: flex;
            gap: 1rem;
            justify-content: center;
            flex-wrap: wrap;
        }

        .btn-contact {
            background: linear-gradient(135deg, var(--success-green), var(--light-green));
            border: none;
            border-radius: 50px;
            padding: 0.75rem 1.5rem;
            color: white;
            text-decoration: none;
            font-weight: 600;
            transition: all 0.3s ease;
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
        }

        .btn-contact:hover {
            transform: translateY(-2px);
            box-shadow: 0 8px 20px rgba(40, 167, 69, 0.3);
            color: white;
            text-decoration: none;
        }

        .btn-contact.whatsapp {
            background: #25D366;
        }

        .btn-contact.phone {
            background: linear-gradient(135deg, var(--primary-blue), var(--secondary-teal));
        }

        /* Loading Animation */
        .loading-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(255, 255, 255, 0.9);
            backdrop-filter: blur(5px);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 9999;
            opacity: 0;
            visibility: hidden;
            transition: all 0.3s ease;
        }

        .loading-overlay.show {
            opacity: 1;
            visibility: visible;
        }

        .loading-spinner {
            width: 50px;
            height: 50px;
            border: 4px solid #e2e8f0;
            border-top: 4px solid var(--primary-blue);
            border-radius: 50%;
            animation: spin 1s linear infinite;
        }

        @keyframes spin {
            0% { transform: rotate(0deg); }
            100% { transform: rotate(360deg); }
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .calculator-container {
                padding: 1rem 0.5rem;
            }

            .calculator-header {
                padding: 2rem 1rem;
            }

            .calculator-body {
                padding: 2rem 1rem;
            }

            .form-section {
                padding: 1.5rem;
            }

            .btn-calculate {
                padding: 0.75rem 2rem;
                font-size: 1rem;
            }

            .result-main {
                font-size: 2.5rem;
            }

            .contact-buttons {
                flex-direction: column;
                align-items: center;
            }

            .btn-contact {
                width: 100%;
                max-width: 250px;
                justify-content: center;
            }
        }

        @media (max-width: 480px) {
            .calculator-title {
                font-size: 1.5rem;
            }

            .calculator-subtitle {
                font-size: 1rem;
            }

            .result-main {
                font-size: 2rem;
            }

            .equipment-grid {
                grid-template-columns: 1fr;
            }
        }