:root {
            --primary: #2b6cb0;
            --primary-dark: #2c5282;
            --secondary: #38a169;
            --danger: #e53e3e;
            --warning: #dd6b20;
            --dark: #1a202c;
            --light: #f7fafc;
            --gray: #718096;
            --gray-light: #e2e8f0;
            --border-radius: 12px;
            --shadow: 0 4px 6px rgba(0, 0, 0, 0.1);
            --shadow-lg: 0 10px 15px rgba(0, 0, 0, 0.1);
            --transition: all 0.3s ease;
        }

        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
            font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
        }

        .main-container {
            background-color: #f8f9fa;
            color: var(--dark);
            line-height: 1.6;
            min-height: 100vh;
            padding: 0;
        }

        .container {
            width: 95%;
            margin: 0 auto;
            padding: 0 20px;
        }

        .header-title {
            background: linear-gradient(135deg, var(--primary) 0%, var(--primary-dark) 100%);
            color: white;
            padding: 60px 0 80px;
            text-align: center;
            margin-bottom: -40px;
            position: relative;
            overflow: hidden;
        }

        .header-title::after {
            content: '';
            position: absolute;
            bottom: -50px;
            left: 0;
            right: 0;
            height: 100px;
            background: #f8f9fa;
            transform: skewY(-2deg);
            z-index: 1;
        }

        h1 {
            font-size: 2.8rem;
            margin-bottom: 15px;
            font-weight: 800;
        }

        .subtitle {
            font-size: 1.2rem;
            opacity: 0.9;
            max-width: 700px;
            margin: 0 auto 30px;
            font-weight: 300;
        }

        .calculator-container {
            position: relative;
            z-index: 2;
            background: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
            padding: 40px;
            margin-bottom: 60px;
        }

        .tabs {
            display: flex;
            margin-bottom: 30px;
            border-bottom: 1px solid var(--gray-light);
        }

        .tab {
            padding: 12px 24px;
            cursor: pointer;
            font-weight: 600;
            color: var(--gray);
            border-bottom: 3px solid transparent;
            transition: var(--transition);
        }

        .tab.active {
            color: var(--primary);
            border-bottom-color: var(--primary);
        }

        .tab:hover:not(.active) {
            color: var(--dark);
            border-bottom-color: var(--gray-light);
        }

        .tab-content {
            display: none;
        }

        .tab-content.active {
            display: block;
        }

        .form-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 25px;
            margin-bottom: 30px;
        }

        .input-group {
            margin-bottom: 20px;
        }

        label {
            display: block;
            margin-bottom: 8px;
            font-weight: 600;
            color: var(--dark);
        }

        input, select {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid var(--gray-light);
            border-radius: var(--border-radius);
            font-size: 1rem;
            transition: var(--transition);
            background-color: white;
        }

        input:focus, select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(43, 108, 176, 0.2);
        }

        .input-unit {
            position: relative;
        }

        .unit {
            position: absolute;
            right: 10px;
            top: 50%;
            transform: translateY(-50%);
            color: var(--gray);
            font-size: 0.9rem;
        }

        .btn {
            background: var(--primary);
            color: white;
            border: none;
            padding: 14px 28px;
            border-radius: var(--border-radius);
            cursor: pointer;
            font-weight: 600;
            font-size: 1rem;
            transition: var(--transition);
            display: inline-flex;
            align-items: center;
            justify-content: center;
        }

        .btn:hover {
            background: var(--primary-dark);
            transform: translateY(-2px);
            box-shadow: var(--shadow);
        }

        .btn i {
            margin-right: 8px;
        }

        .btn-secondary {
            background: white;
            color: var(--primary);
            border: 1px solid var(--gray-light);
        }

        .btn-secondary:hover {
            background: var(--gray-light);
            border-color: var(--gray);
        }

        .btn-danger {
            background: var(--danger);
        }

        .btn-danger:hover {
            background: #c53030;
        }

        .results {
            background: #f0f9ff;
            border-radius: var(--border-radius);
            padding: 30px;
            margin-top: 40px;
            border-left: 4px solid var(--primary);
        }

        .results-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
            gap: 30px;
            margin-top: 20px;
        }

        .result-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            box-shadow: var(--shadow);
            text-align: center;
        }

        .result-value {
            font-size: 2.2rem;
            font-weight: 700;
            color: var(--primary);
            margin: 10px 0;
        }

        .result-label {
            color: var(--gray);
            font-size: 0.9rem;
        }

        .comparison {
            margin-top: 50px;
        }

        .vehicles-container {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 20px;
            margin-top: 20px;
        }

        .vehicle-card {
            background: white;
            border-radius: var(--border-radius);
            padding: 20px;
            box-shadow: var(--shadow);
            position: relative;
        }

        .vehicle-card .remove-vehicle {
            position: absolute;
            top: 10px;
            right: 10px;
            color: var(--gray);
            cursor: pointer;
            transition: var(--transition);
        }

        .vehicle-card .remove-vehicle:hover {
            color: var(--danger);
        }

        .vehicle-header {
            display: flex;
            align-items: center;
            margin-bottom: 15px;
        }

        .vehicle-icon {
            width: 40px;
            height: 40px;
            background: var(--gray-light);
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 15px;
            color: var(--primary);
        }

        .vehicle-name {
            font-weight: 600;
            font-size: 1.1rem;
        }

        .vehicle-stats {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 15px;
        }

        .vehicle-stat {
            font-size: 0.9rem;
        }

        .vehicle-stat .value {
            font-weight: 600;
            color: var(--primary);
        }

        .history {
            margin-top: 50px;
        }

        .history-items {
            margin-top: 20px;
        }

        .history-item {
            background: white;
            border-radius: var(--border-radius);
            padding: 15px 20px;
            margin-bottom: 10px;
            box-shadow: var(--shadow);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .history-date {
            color: var(--gray);
            font-size: 0.8rem;
        }

        .history-value {
            font-weight: 600;
        }

        .tips {
            background: white;
            border-radius: var(--border-radius);
            padding: 40px;
            box-shadow: var(--shadow);
            margin: 60px 0;
        }

        .tips-grid {
            display: grid;
            grid-template-columns: repeat(auto-fit, minmax(300px, 1fr));
            gap: 30px;
            margin-top: 30px;
        }

        .tip-card {
            display: flex;
            align-items: flex-start;
        }

        .tip-icon {
            background: #ebf8ff;
            color: var(--primary);
            width: 50px;
            height: 50px;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            margin-right: 20px;
            flex-shrink: 0;
        }

        .tip-content h3 {
            margin-bottom: 10px;
            color: var(--dark);
        }

        .tip-content p {
            color: var(--gray);
            font-size: 0.95rem;
        }

        

        

        .notification {
            position: fixed;
            top: 20px;
            right: 20px;
            padding: 15px 25px;
            background: var(--secondary);
            color: white;
            border-radius: var(--border-radius);
            box-shadow: var(--shadow-lg);
            transform: translateX(150%);
            transition: transform 0.3s ease;
            z-index: 1000;
        }

        .notification.show {
            transform: translateX(0);
        }

        @media (max-width: 768px) {
            h1 {
                font-size: 2.2rem;
            }
            
            .calculator-container {
                padding: 30px 20px;
            }
            
            .form-grid {
                grid-template-columns: 1fr;
            }
            
            .results-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 480px) {
            h1 {
                font-size: 1.8rem;
            }
            
            .tabs {
                flex-direction: column;
                border-bottom: none;
            }
            
            .tab {
                border-bottom: 1px solid var(--gray-light);
                border-left: 3px solid transparent;
            }
            
            .tab.active {
                border-left-color: var(--primary);
                border-bottom-color: var(--gray-light);
            }
            
            .results-grid {
                grid-template-columns: 1fr;
            }
        }


 /* ===== ARTICLE SPECIFIC STYLES - NO BODY STYLES ===== */
 #fuel-guide-article {
      width: 95%;
      margin: 0 auto;
      padding: 2rem 1.5rem 3rem 1.5rem;
      font-family: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
    }

    /* Hero Section */
    .fuel-guide-hero {
      text-align: center;
      margin-bottom: 2.5rem;
      padding: 2rem 1.5rem;
      background: linear-gradient(135deg, #2b6cb0 0%, #2c5282 100%);
      border-radius: 32px;
      box-shadow: 0 12px 30px rgba(43, 108, 176, 0.3);
    }

    .fuel-guide-hero h2 {
      font-size: 2.6rem;
      font-weight: 800;
      color: white;
      margin-bottom: 1rem;
      letter-spacing: -0.02em;
      font-family: 'Montserrat', serif;
    }

    .fuel-guide-hero .fuel-hero-sub {
      font-size: 1.2rem;
      color: rgba(255, 255, 255, 0.9);
      max-width: 720px;
      margin: 0 auto;
      line-height: 1.5;
    }

    .fuel-guide-meta {
      display: flex;
      justify-content: center;
      gap: 2rem;
      color: rgba(255, 255, 255, 0.8);
      font-weight: 500;
      margin-top: 1.2rem;
      flex-wrap: wrap;
    }

    .fuel-guide-meta span i {
      margin-right: 0.5rem;
    }

    /* Main Content */
    .fuel-main-content {
      background: white;
      border-radius: 28px;
      padding: 2rem 2rem 2.5rem 2rem;
      box-shadow: 0 8px 24px rgba(0, 0, 0, 0.08);
      border: 1px solid rgba(43, 108, 176, 0.15);
    }

    .fuel-main-content h2 {
      font-size: 1.8rem;
      font-weight: 700;
      margin-top: 2rem;
      margin-bottom: 1rem;
      color: #2b6cb0;
      border-left: 5px solid #38a169;
      padding-left: 1rem;
      font-family: 'Montserrat', serif;
    }

    .fuel-main-content h2:first-of-type {
      margin-top: 0;
    }

    .fuel-main-content h3 {
      font-size: 1.35rem;
      font-weight: 600;
      margin: 1.5rem 0 0.75rem 0;
      color: #38a169;
    }

    .fuel-main-content p {
      font-size: 1.05rem;
      color: #2d3748;
      margin-bottom: 1.2rem;
      line-height: 1.6;
    }

    .fuel-main-content ul, .fuel-main-content ol {
      margin: 1rem 0 1.2rem 1.8rem;
      color: #2d3748;
      line-height: 1.6;
    }

    .fuel-main-content li {
      margin-bottom: 0.5rem;
    }

    .fuel-highlight-box {
      background: linear-gradient(135deg, rgba(43, 108, 176, 0.08), rgba(56, 161, 105, 0.05));
      border-left: 6px solid #38a169;
      padding: 1.25rem 1.5rem;
      border-radius: 20px;
      margin: 1.75rem 0;
    }

    .fuel-pro-tip {
      background: rgba(56, 161, 105, 0.1);
      border-radius: 20px;
      padding: 1.2rem 1.5rem;
      margin: 1.5rem 0;
      display: flex;
      gap: 1rem;
      align-items: flex-start;
      border: 1px solid rgba(43, 108, 176, 0.3);
    }

    .fuel-pro-tip i {
      font-size: 1.8rem;
      color: #38a169;
    }

    .fuel-stats-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(200px, 1fr));
      gap: 1.2rem;
      margin: 2rem 0;
    }

    .fuel-stat-card {
      background: #f8f9fa;
      border-radius: 20px;
      padding: 1.2rem;
      text-align: center;
      transition: all 0.2s;
      border: 1px solid rgba(43, 108, 176, 0.2);
    }

    .fuel-stat-card .stat-number {
      font-size: 2rem;
      font-weight: 800;
      color: #2b6cb0;
      margin-bottom: 0.25rem;
    }

    .fuel-quote-block {
      background: #f8f9fa;
      padding: 1.5rem;
      border-radius: 24px;
      text-align: center;
      font-style: italic;
      margin: 1.5rem 0;
      border: 1px solid rgba(43, 108, 176, 0.2);
    }

    .fuel-quote-block i {
      font-size: 2rem;
      color: #38a169;
      margin-bottom: 0.5rem;
      display: inline-block;
    }

    .fuel-table-wrapper {
      overflow-x: auto;
      margin: 1.5rem 0;
    }

    .fuel-conversion-table {
      width: 100%;
      border-collapse: collapse;
      background: #f8f9fa;
      border-radius: 16px;
      overflow: hidden;
    }

    .fuel-conversion-table th, .fuel-conversion-table td {
      padding: 12px 16px;
      text-align: left;
      border-bottom: 1px solid rgba(43, 108, 176, 0.2);
    }

    .fuel-conversion-table th {
      background: rgba(43, 108, 176, 0.1);
      font-weight: 600;
      color: #2b6cb0;
    }

    .fuel-conversion-table tr:hover {
      background: rgba(56, 161, 105, 0.05);
    }

    .fuel-tips-grid {
      display: grid;
      grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
      gap: 1.2rem;
      margin: 1.5rem 0;
    }

    .fuel-tip-card {
      background: #f8f9fa;
      border-radius: 16px;
      padding: 1.2rem;
      border: 1px solid rgba(43, 108, 176, 0.2);
      transition: all 0.2s;
    }

    .fuel-tip-card:hover {
      transform: translateY(-3px);
      box-shadow: 0 8px 20px rgba(43, 108, 176, 0.1);
    }

    .fuel-tip-title {
      font-weight: 700;
      color: #2b6cb0;
      margin-bottom: 0.5rem;
      font-size: 1.1rem;
      display: flex;
      align-items: center;
      gap: 0.5rem;
    }

    .fuel-footer-note {
      margin-top: 2.5rem;
      text-align: center;
      font-size: 0.85rem;
      color: #718096;
      border-top: 1px solid #e2e8f0;
      padding-top: 2rem;
    }

    @media (max-width: 768px) {
      .fuel-guide-hero h2 {
        font-size: 2rem;
      }
      .fuel-main-content {
        padding: 1.5rem;
      }
      #fuel-guide-article {
        padding: 1rem;
      }
    }