/* Lightning-Themed Design System */
        :root {
            /* Lightning Color Palette */
            --lightning-yellow: #fbbf24;
            --lightning-blue: #0ea5e9;
            --lightning-purple: #8b5cf6;
            --lightning-white: #f8fafc;
            --lightning-dark: #0f172a;
            --storm-gray: #334155;
            --energy-orange: #f97316;
            
            /* Spacing Scale */
            --space-xs: 0.25rem;
            --space-sm: 0.5rem;
            --space-md: 1rem;
            --space-lg: 1.5rem;
            --space-xl: 2rem;
            --space-2xl: 3rem;
            --space-3xl: 4rem;
            
            /* Professional Shadows */
            --shadow-sm: 0 1px 2px 0 rgba(251, 191, 36, 0.05);
            --shadow-md: 0 4px 6px -1px rgba(251, 191, 36, 0.1);
            --shadow-lg: 0 10px 15px -3px rgba(251, 191, 36, 0.1);
            --shadow-xl: 0 20px 25px -5px rgba(251, 191, 36, 0.1);
            
            /* Border Radius */
            --radius: 0.75rem;
            --radius-sm: 0.5rem;
            --radius-lg: 1rem;
        }

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

        body {
            font-family: 'Inter', -apple-system, BlinkMacSystemFont, sans-serif;
            background: linear-gradient(135deg, var(--lightning-dark) 0%, var(--storm-gray) 50%, var(--lightning-dark) 100%);
            color: var(--lightning-white);
            min-height: 100vh;
            overflow-x: hidden;
        }

        /* Hero Section */
        .hero {
            text-align: center;
            padding: var(--space-3xl) var(--space-lg);
            background: radial-gradient(circle at center, rgba(251, 191, 36, 0.1) 0%, transparent 70%);
            position: relative;
            overflow: hidden;
        }

        .hero::before {
            content: '';
            position: absolute;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: url('data:image/svg+xml,<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 100 100"><circle cx="20" cy="20" r="1" fill="%23fbbf24" opacity="0.3"/><circle cx="80" cy="40" r="0.5" fill="%23fbbf24" opacity="0.5"/><circle cx="40" cy="80" r="1.5" fill="%23fbbf24" opacity="0.4"/><circle cx="90" cy="10" r="0.8" fill="%23fbbf24" opacity="0.6"/><circle cx="10" cy="90" r="1.2" fill="%23fbbf24" opacity="0.3"/></svg>') repeat;
            animation: sparkle 8s linear infinite;
            pointer-events: none;
        }

        @keyframes sparkle {
            0% { transform: translateY(0px) rotate(0deg); }
            100% { transform: translateY(-100px) rotate(360deg); }
        }

        .hero-badge {
            display: inline-flex;
            align-items: center;
            gap: var(--space-sm);
            background: linear-gradient(135deg, var(--lightning-yellow), var(--energy-orange));
            color: var(--lightning-dark);
            padding: var(--space-sm) var(--space-lg);
            border-radius: 2rem;
            font-size: 0.875rem;
            font-weight: 600;
            margin-bottom: var(--space-lg);
            box-shadow: var(--shadow-lg);
        }
        .hero-title {
            font-size: clamp(2.5rem, 6vw, 4rem);
            font-weight: 800;
            background: linear-gradient(135deg, var(--lightning-yellow), var(--lightning-blue));
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: var(--space-lg);
            line-height: 1.1;
        }

        .hero-subtitle {
            font-size: 1.25rem;
            color: rgba(248, 250, 252, 0.8);
            max-width: 600px;
            margin: 0 auto var(--space-2xl);
            line-height: 1.6;
        }

        /* Main Content Layout */
        .calculator-container {
            max-width: 1200px;
            margin: 0 auto;
            padding: 0 var(--space-lg) var(--space-3xl);
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: var(--space-2xl);
            align-items: start;
        }

        /* Input Panel */
        .input-panel {
            background: rgba(248, 250, 252, 0.05);
            border: 1px solid rgba(251, 191, 36, 0.2);
            border-radius: var(--radius-lg);
            padding: var(--space-2xl);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-xl);
            position: sticky;
            top: 80px;
        }

        .panel-title {
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--lightning-yellow);
            margin-bottom: var(--space-xl);
            display: flex;
            align-items: center;
            gap: var(--space-sm);
        }

        .input-group {
            margin-bottom: var(--space-xl);
        }

        .input-label {
            display: block;
            font-size: 1rem;
            font-weight: 600;
            color: var(--lightning-white);
            margin-bottom: var(--space-sm);
        }
        .slider-container {
            position: relative;
            margin-bottom: var(--space-md);
        }

        .slider {
            width: 100%;
            height: 8px;
            border-radius: 4px;
            background: linear-gradient(90deg, var(--lightning-yellow), var(--lightning-blue));
            outline: none;
            -webkit-appearance: none;
            appearance: none;
            cursor: pointer;
        }

        .slider::-webkit-slider-thumb {
            appearance: none;
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--lightning-white);
            border: 3px solid var(--lightning-yellow);
            cursor: pointer;
            box-shadow: 0 2px 8px rgba(251, 191, 36, 0.3);
        }

        .slider::-moz-range-thumb {
            width: 24px;
            height: 24px;
            border-radius: 50%;
            background: var(--lightning-white);
            border: 3px solid var(--lightning-yellow);
            cursor: pointer;
            box-shadow: 0 2px 8px rgba(251, 191, 36, 0.3);
        }

        .slider-value {
            background: linear-gradient(135deg, var(--lightning-yellow), var(--energy-orange));
            color: var(--lightning-dark);
            padding: var(--space-sm) var(--space-md);
            border-radius: var(--radius);
            font-weight: 700;
            font-size: 1.125rem;
            display: inline-block;
            margin-top: var(--space-sm);
        }

        .lifestyle-options {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: var(--space-md);
            margin-top: var(--space-sm);
        }

        .lifestyle-option {
            background: rgba(248, 250, 252, 0.05);
            border: 2px solid rgba(251, 191, 36, 0.2);
            border-radius: var(--radius);
            padding: var(--space-lg);
            text-align: center;
            cursor: pointer;
            transition: all 0.3s ease;
        }
        .lifestyle-option.active {
            background: linear-gradient(135deg, var(--lightning-yellow), var(--lightning-blue));
            color: var(--lightning-dark);
            border-color: var(--lightning-yellow);
            transform: translateY(-2px);
            box-shadow: var(--shadow-lg);
        }

        .lifestyle-option:hover {
            border-color: var(--lightning-yellow);
            transform: translateY(-2px);
        }

        .lifestyle-emoji {
            font-size: 1.5rem;
            margin-bottom: var(--space-sm);
        }

        .lifestyle-label {
            font-weight: 600;
            font-size: 0.875rem;
        }

        /* Results Panel */
        .results-panel {
            background: rgba(248, 250, 252, 0.05);
            border: 1px solid rgba(251, 191, 36, 0.2);
            border-radius: var(--radius-lg);
            padding: var(--space-2xl);
            backdrop-filter: blur(10px);
            box-shadow: var(--shadow-xl);
        }

        .lightning-animation {
            text-align: center;
            margin-bottom: var(--space-2xl);
            position: relative;
            height: 120px;
        }

        .lightning-bolt {
            font-size: 4rem;
            color: var(--lightning-yellow);
            animation: lightning-flash 2s ease-in-out infinite;
            text-shadow: 0 0 20px var(--lightning-yellow);
        }

        @keyframes lightning-flash {
            0%, 50%, 100% { opacity: 1; transform: scale(1); }
            25% { opacity: 0.7; transform: scale(1.1); }
            75% { opacity: 0.9; transform: scale(0.95); }
        }

        .main-result {
            text-align: center;
            margin-bottom: var(--space-2xl);
        }

        .result-number {
            font-size: clamp(2rem, 4vw, 3.5rem);
            font-weight: 800;
            background: linear-gradient(135deg, var(--lightning-yellow), var(--energy-orange));
            background-clip: text;
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            margin-bottom: var(--space-sm);
        }
        .result-label {
            font-size: 1.25rem;
            color: rgba(248, 250, 252, 0.9);
            font-weight: 600;
        }

        .energy-breakdown {
            background: rgba(251, 191, 36, 0.1);
            border-radius: var(--radius);
            padding: var(--space-lg);
            margin-bottom: var(--space-xl);
        }

        .breakdown-title {
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--lightning-yellow);
            margin-bottom: var(--space-md);
        }

        .breakdown-item {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: var(--space-sm) 0;
            border-bottom: 1px solid rgba(251, 191, 36, 0.1);
        }

        .breakdown-item:last-child {
            border-bottom: none;
        }

        .comparisons-grid {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: var(--space-lg);
        }

        .comparison-card {
            background: rgba(14, 165, 233, 0.1);
            border: 1px solid rgba(14, 165, 233, 0.2);
            border-radius: var(--radius);
            padding: var(--space-lg);
            text-align: center;
        }

        .comparison-emoji {
            font-size: 2rem;
            margin-bottom: var(--space-sm);
        }

        .comparison-value {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--lightning-blue);
            margin-bottom: var(--space-xs);
        }

        .comparison-label {
            font-size: 0.875rem;
            color: rgba(248, 250, 252, 0.7);
        }
        /* Share Button */
        .share-button {
            background: linear-gradient(135deg, var(--lightning-purple), var(--lightning-blue));
            color: white;
            border: none;
            border-radius: var(--radius);
            padding: 0.75rem 1.5rem;
            font-size: 1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            margin-top: var(--space-lg);
            box-shadow: 0 4px 15px rgba(139, 92, 246, 0.3);
            width: 100%;
            justify-content: center;
        }

        .share-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 6px 20px rgba(139, 92, 246, 0.4);
        }

        /* Future Projection */
        .future-projection {
            margin-top: var(--space-xl);
            background: rgba(139, 92, 246, 0.1);
            border: 1px solid rgba(139, 92, 246, 0.2);
            border-radius: var(--radius);
            padding: var(--space-lg);
        }

        .projection-title {
            font-size: 1.125rem;
            font-weight: 700;
            color: var(--lightning-purple);
            margin-bottom: var(--space-md);
        }

        /* Responsive Design */
        @media (max-width: 768px) {
            .calculator-container {
                grid-template-columns: 1fr;
                gap: var(--space-xl);
            }

            .input-panel {
                position: static;
            }

            .lifestyle-options {
                grid-template-columns: 1fr;
            }

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

            .hero {
                padding: var(--space-2xl) var(--space-lg);
            }
        }
        /* Hidden canvas for sharing */
        #shareCanvas {
            display: none;
        }