:root {
            --primary-blue: #0066CC;
            --accent-cyan: #00D4FF;
            --tech-dark: #0A1628;
            --pure-white: #FFFFFF;
            --energy-green: #00C896;
            --warm-sand: #F5E6D3;
            --gradient-ocean: linear-gradient(135deg, #0066CC 0%, #00D4FF 100%);
        }
        
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Inter', sans-serif;
            background: var(--tech-dark);
            color: var(--pure-white);
            overflow-x: hidden;
        }
        
        /* Navigation */
        nav {
            position: fixed;
            top: 0;
            width: 100%;
            padding: 20px 5%;
            background: rgba(10, 22, 40, 0.95);
            backdrop-filter: blur(10px);
            z-index: 1000;
            transition: all 0.3s ease;
        }
        
        nav.scrolled {
            padding: 15px 5%;
            box-shadow: 0 5px 20px rgba(0,0,0,0.3);
        }
        
        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            max-width: 1400px;
            margin: 0 auto;
        }
        
        .logo {
            margin-right: 10px;
            font-size: 28px;
            font-weight: 800;
            background: var(--gradient-ocean);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -1px;
        }
        
        .nav-menu {
            display: flex;
            gap: 35px;
            align-items: center;
        }
        
        .nav-link {
            color: var(--pure-white);
            text-decoration: none;
            font-weight: 500;
            transition: color 0.3s ease;
            position: relative;
        }
        
        .nav-link:hover, .nav-link.active {
            color: var(--accent-cyan);
        }
        
        .nav-link::after {
            content: '';
            position: absolute;
            bottom: -5px;
            left: 0;
            width: 0;
            height: 2px;
            background: var(--accent-cyan);
            transition: width 0.3s ease;
        }
        
        .nav-link:hover::after, .nav-link.active::after {
            width: 100%;
        }
        
        .cta-button {
            padding: 12px 25px;
            background: var(--gradient-ocean);
            border: none;
            border-radius: 30px;
            color: var(--pure-white);
            font-weight: 600;
            cursor: pointer;
            transition: transform 0.3s ease, box-shadow 0.3s ease;
        }
        
        .cta-button:hover {
            transform: translateY(-2px);
            box-shadow: 0 10px 30px rgba(0,212,255,0.3);
        }
        
        /* Hero Section */
        .solutions-hero {
            padding: 150px 5% 80px;
            background: linear-gradient(180deg, rgba(0,102,204,0.1) 0%, var(--tech-dark) 100%);
            text-align: center;
        }
        
        .hero-title {
            font-size: clamp(2.5rem, 5vw, 4rem);
            font-weight: 800;
            margin-bottom: 20px;
            line-height: 1.2;
        }
        
        .gradient-text {
            background: linear-gradient(90deg, var(--accent-cyan), var(--energy-green));
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .hero-subtitle {
            font-size: 1.3rem;
            color: #B8C5D6;
            max-width: 700px;
            margin: 0 auto;
        }
        
        /* Tab Navigation */
        .tab-section {
            
            padding: 10px 5%;
            max-width: 1400px;
            margin: 0 auto;
        }
        
        .tab-nav {
            display: flex;
            justify-content: center;
            gap: 20px;
            margin-bottom: 50px;
            flex-wrap: wrap;
        }
        
        .tab-button {
			
            padding: 15px 40px;
            background: rgba(255,255,255,0.05);
            border: 2px solid rgba(0,212,255,0.2);
            border-radius: 50px;
            color: var(--pure-white);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            position: relative;
            overflow: hidden;
        }
        
        .tab-button:hover {
            border-color: var(--accent-cyan);
            transform: translateY(-2px);
        }
        
        .tab-button.active {
			border: 0px solid rgba(0,212,255,0.2);
            background: var(--gradient-ocean);
            border-color: transparent;
            box-shadow: 0 10px 30px rgba(0,212,255,0.3);
        }
        
        .tab-button .icon {
            display: inline-block;
            margin-right: 10px;
            font-size: 1.3rem;
        }
        
        /* Tab Content */
        .tab-content {
            display: none;
            animation: fadeIn 0.5s ease;
        }
        
        .tab-content.active {
            display: block;
        }
        
        @keyframes fadeIn {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .solution-grid {
            justify-content: center
            display: grid;
            grid-template-columns: 1fr 1r;
            gap: 50px;
            align-content: center;
        }
        
        .solution-info {
            margin: auto;
          
            height: 100%;
            padding: 10px;
            background: rgba(255,255,255,0.03);
            border-radius: 20px;
            border: 1px solid rgba(0,212,255,0.2);
           
        }
        
        .solution-title {
            font-size: 2rem;
            font-weight: 700;
            margin-bottom: 20px;
        }
        
        .challenge-list {
            margin: 30px 0;
        }
        
        .challenge-item {
            display: flex;
            align-items: start;
            gap: 15px;
            margin-bottom: 15px;
        }
        
        .challenge-icon {
            width: 24px;
            height: 24px;
            background: rgba(255,0,0,0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: #FF6B6B;
            flex-shrink: 0;
        }
        
        .solution-list {
            margin: 30px 0;
        }
        
        .solution-item {
            display: flex;
            align-items: start;
            gap: 15px;
            margin-bottom: 15px;
        }
        
        .solution-icon {
            width: 24px;
            height: 24px;
            background: rgba(0,200,150,0.2);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            color: var(--energy-green);
            flex-shrink: 0;
        }
        
        .case-study {
            margin: auto;
            padding: 10px;
            background: rgba(0,212,255,0.05);
            border-radius: 15px;
            border-left: 4px solid var(--accent-cyan);
            max-width: 80vw;
            
        }
        
        .case-study-title {
            font-size: 1.3rem;
            font-weight: 700;
            margin-bottom: 15px;
            color: var(--accent-cyan);
        }
        
        .case-study-metrics {
            display: grid;
            grid-template-columns: repeat(2, 1fr);
            gap: 20px;
            margin-top: 20px;
        }
        
        .metric {
            text-align: center;
            padding: 10px;
            background: rgba(0,0,0,0.3);
            border-radius: 10px;
        }
        
        .metric-value {
            font-size: 2rem;
            font-weight: 800;
            color: var(--energy-green);
        }
        
        .metric-label {
            font-size: 0.9rem;
            color: #B8C5D6;
            margin-top: 5px;
        }
#municipal-chart{
    margin: auto;
    height: 400px;
    display: block;
    max-width: 80vw;
    
}

        /* Calculator Section */
        .calculator-section {
            padding: 100px 5%;
            background: linear-gradient(180deg, #0F1E35 0%, var(--tech-dark) 100%);
        }
        
        .section-title {
            text-align: center;
            font-size: clamp(2rem, 4vw, 3rem);
            font-weight: 800;
            margin-bottom: 20px;
        }
        
        .section-subtitle {
            text-align: center;
            font-size: 1.2rem;
            color: #B8C5D6;
            margin-bottom: 60px;
            max-width: 700px;
            margin-left: auto;
            margin-right: auto;
        }
        
        .calculator-container {
            max-width: 900px;
            margin: 0 auto;
            background: rgba(255,255,255,0.03);
            border-radius: 30px;
            padding: 10px;
            border: 1px solid rgba(0,212,255,0.2);
        }
        
        .calculator-form {
            display: grid;
            gap: 30px;
        }
        
        .form-group {
            display: flex;
            flex-direction: column;
            gap: 10px;
        }
        
        .form-label {
            font-weight: 600;
            color: var(--pure-white);
        }
        
        .form-input, .form-select {
            padding: 15px 20px;
            background: rgba(0,0,0,0.3);
            border: 1px solid rgba(0,212,255,0.3);
            border-radius: 10px;
            color: var(--pure-white);
            font-size: 1rem;
            transition: all 0.3s ease;
        }
        
        .form-input:focus, .form-select:focus {
            outline: none;
            border-color: var(--accent-cyan);
            box-shadow: 0 0 20px rgba(0,212,255,0.2);
        }
        
        .form-slider {
            -webkit-appearance: none;
            appearance: none;
            height: 8px;
            background: rgba(0,212,255,0.2);
            border-radius: 5px;
            outline: none;
            margin: 10px 0;
        }
        
        .form-slider::-webkit-slider-thumb {
            -webkit-appearance: none;
            appearance: none;
            width: 24px;
            height: 24px;
            background: var(--gradient-ocean);
            border-radius: 50%;
            cursor: pointer;
        }
        
        .slider-value {
            text-align: center;
            font-size: 1.5rem;
            font-weight: 700;
            color: var(--accent-cyan);
            margin-top: 10px;
        }
        
        .calculate-btn {
            padding: 18px 40px;
            background: var(--gradient-ocean);
            border: none;
            border-radius: 50px;
            color: var(--pure-white);
            font-size: 1.2rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            margin-top: 20px;
        }
        
        .calculate-btn:hover {
            transform: translateY(-3px);
            box-shadow: 0 15px 40px rgba(0,212,255,0.4);
        }
        
        /* Results Display */
        .results-container {
            margin-top: 50px;
            padding: 10px;
            background: rgba(0,212,255,0.05);
            border-radius: 20px;
            border: 2px solid var(--accent-cyan);
            display: none;
        }
        
        .results-container.active {
            display: block;
            animation: slideIn 0.5s ease;
        }
        
        @keyframes slideIn {
            from { opacity: 0; transform: translateY(30px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .results-title {
            font-size: 1.8rem;
            font-weight: 700;
            margin-bottom: 30px;
            text-align: center;
        }
        
        .results-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 30px;
        }
        
        .result-card {
            text-align: center;
            padding: 25px;
            background: rgba(0,0,0,0.3);
            border-radius: 15px;
        }
        
        .result-value {
            font-size: 2.5rem;
            font-weight: 800;
            background: var(--gradient-ocean);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
        }
        
        .result-label {
            margin-top: 10px;
            color: #B8C5D6;
        }
        
        /* Charts Container */
        .charts-container {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 30px;
            margin-top: 40px;
        }
        
        .chart-box {
            background: rgba(0,0,0,0.3);
            border-radius: 15px;
            padding: 10px;
            width: 98%;
            height: 300px;
        }
        
        /* Comparison Table */
        .comparison-section {
            padding: 100px 5%;
        }
        
        .comparison-table {
            max-width: 1200px;
            margin: 0 auto;
            overflow-x: auto;
        }
        
        table {
            width: 100%;
            border-collapse: separate;
            border-spacing: 0;
            background: rgba(255,255,255,0.03);
            border-radius: 20px;
            overflow: hidden;
        }
        
        thead {
            background: var(--gradient-ocean);
        }
        
        th {
            padding: 20px;
            text-align: left;
            font-weight: 600;
        }
        
        td {
            padding: 20px;
            border-top: 1px solid rgba(255,255,255,0.1);
        }
        
        tbody tr:hover {
            background: rgba(0,212,255,0.05);
            transition: background 0.3s ease;
        }
        
        .check-mark {
            color: var(--energy-green);
            font-size: 1.2rem;
        }
        
        .cross-mark {
            color: #FF6B6B;
            font-size: 1.2rem;
        }
        
        /* CTA Section */
        .solutions-cta {
            padding: 100px 5%;
            text-align: center;
            background: linear-gradient(135deg, rgba(0,102,204,0.1), rgba(0,212,255,0.1));
        }
        
        .cta-title {
            font-size: 2.5rem;
            font-weight: 800;
            margin-bottom: 20px;
        }
        
        .cta-subtitle {
            font-size: 1.2rem;
            color: #B8C5D6;
            margin-bottom: 40px;
        }
        
        .cta-buttons {
            display: flex;
            gap: 20px;
            justify-content: center;
            flex-wrap: wrap;
        }
        
        .btn-primary {
            padding: 18px 40px;
            background: var(--gradient-ocean);
            border: none;
            border-radius: 50px;
            color: var(--pure-white);
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }
        
        .btn-secondary {
            padding: 18px 40px;
            background: transparent;
            border: 2px solid var(--accent-cyan);
            border-radius: 50px;
            color: var(--accent-cyan);
            font-size: 18px;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.3s ease;
            text-decoration: none;
            display: inline-block;
        }
        
        /* Footer */
        footer {
            padding: 40px 5%;
            background: #050A15;
            text-align: center;
            border-top: 1px solid rgba(0,212,255,0.2);
        }
        
        /* Responsive */
        @media (max-width: 768px) {
            .nav-menu {
                display: none;
            }
            
            .solution-grid {
                grid-template-columns: 1fr;
            }
            
            .results-grid {
                grid-template-columns: 1fr;
            }
            
            .charts-container {
                grid-template-columns: 1fr;
            }
            
            .comparison-table {
                font-size: 0.9rem;
            }
            
            th, td {
                padding: 10px;
            }
        }