:root {
            --bg-dark: #f8fafc;
            --bg-card: rgba(255, 255, 255, 0.85);
            --border-card: rgba(15, 23, 42, 0.08);
            --primary: #059669; /* Emerald Green - slightly darker for contrast */
            --primary-glow: rgba(5, 150, 105, 0.1);
            --cyan: #0284c7; /* Sky Blue - darker for contrast */
            --cyan-glow: rgba(2, 132, 199, 0.1);
            --text-light: #0f172a; /* Navy Slate as body text */
            --text-gray: #475569; /* Slate gray secondary */
            --text-dark: #ffffff; /* White text for active elements */
            --danger: #dc2626;
            --warning: #d97706;
            --success: #059669;
        }

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

        body {
            background-color: var(--bg-dark);
            background-image: 
                radial-gradient(at 0% 0%, rgba(5, 150, 105, 0.05) 0px, transparent 50%),
                radial-gradient(at 100% 100%, rgba(2, 132, 199, 0.05) 0px, transparent 50%);
            color: var(--text-light);
            font-family: 'Plus Jakarta Sans', sans-serif;
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            padding: 3rem 1.5rem;
            line-height: 1.5;
        }

        .container {
            width: 100%;
            max-width: 1100px;
            display: flex;
            flex-direction: column;
            gap: 2.5rem;
        }

        /* Header UI */
        header {
            text-align: center;
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 0.5rem;
        }

        .badge {
            background: rgba(16, 185, 129, 0.1);
            border: 1px solid var(--primary);
            color: var(--primary);
            padding: 0.3rem 1rem;
            border-radius: 50px;
            font-size: 0.8rem;
            font-weight: 700;
            text-transform: uppercase;
            letter-spacing: 0.1em;
            margin-bottom: 0.5rem;
            box-shadow: 0 0 15px var(--primary-glow);
        }

        header h1 {
            font-family: 'Outfit', sans-serif;
            font-size: 3rem;
            font-weight: 800;
            background: linear-gradient(135deg, #10b981 0%, #06b6d4 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            letter-spacing: -0.04em;
        }

        header p {
            color: var(--text-gray);
            font-size: 1.1rem;
            font-weight: 400;
            max-width: 600px;
        }

        /* Language Switcher */
        .lang-switch {
            display: flex;
            gap: 0.2rem;
            background: rgba(15, 23, 42, 0.04);
            border: 1px solid var(--border-card);
            padding: 0.2rem;
            border-radius: 8px;
            width: max-content;
            margin-bottom: 1.5rem;
        }

        .lang-btn {
            background: transparent;
            border: none;
            color: var(--text-gray);
            padding: 0.4rem 0.8rem;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.75rem;
            font-weight: 700;
            transition: all 0.2s ease;
        }

        .lang-btn:hover {
            color: var(--text-light);
        }

        .lang-btn.active {
            background: var(--primary);
            color: var(--text-dark);
        }

        /* Tabs System */
        .tabs-container {
            width: 100%;
            overflow-x: auto;
            scrollbar-width: none; /* Hide scrollbar for Firefox */
            -ms-overflow-style: none; /* Hide scrollbar for IE/Edge */
            padding: 0.5rem 1rem; /* Space for scroll alignment and card shadows */
        }

        .tabs-container::-webkit-scrollbar {
            display: none; /* Hide scrollbar for Chrome/Safari/Webkit */
        }

        .tabs {
            display: flex;
            flex-wrap: nowrap; /* Prevent wrapping */
            gap: 0.5rem;
            background: rgba(15, 23, 42, 0.03);
            border: 1px solid var(--border-card);
            padding: 0.4rem;
            border-radius: 100px;
            width: max-content;
            margin: 0 auto; /* Centers when fits, aligns left when overflowing */
        }

        .tab-btn {
            background: transparent;
            border: none;
            color: var(--text-gray);
            padding: 0.8rem 1.8rem;
            border-radius: 100px;
            cursor: pointer;
            font-size: 0.95rem;
            font-weight: 600;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            white-space: nowrap;
        }

        .tab-btn:hover {
            color: var(--text-light);
        }

        .tab-btn.active {
            background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
            color: var(--text-dark);
            font-weight: 700;
            box-shadow: 0 10px 20px rgba(16, 185, 129, 0.2);
        }

        /* Responsive Text Spans */
        .desktop-text {
            display: inline;
        }

        .mobile-text {
            display: none;
        }

        /* Search & Category Filter Navigation */
        .nav-control-panel {
            width: 100%;
            max-width: 900px;
            margin: 0 auto 1.5rem auto;
            padding: 0 1rem;
            display: flex;
            flex-direction: column;
            gap: 1rem;
            align-items: center;
        }

        .search-box-wrapper {
            position: relative;
            width: 100%;
            max-width: 500px;
            display: flex;
            align-items: center;
        }

        .search-box-wrapper .search-icon {
            position: absolute;
            left: 1.2rem;
            font-size: 1.1rem;
            color: var(--text-gray);
            pointer-events: none;
            opacity: 0.7;
        }

        .search-clear-btn {
            position: absolute;
            right: 1rem;
            font-size: 1rem;
            color: var(--text-gray);
            cursor: pointer;
            opacity: 0.5;
            transition: opacity 0.2s;
            display: none; /* hidden by default */
        }
        .search-clear-btn:hover {
            opacity: 1;
        }

        .search-box-wrapper input {
            width: 100%;
            background: rgba(255, 255, 255, 0.45);
            border: 1px solid var(--border-card);
            padding: 0.9rem 2.5rem 0.9rem 2.8rem;
            border-radius: 14px;
            color: var(--text-light);
            font-size: 1.05rem;
            font-weight: 500;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            backdrop-filter: blur(8px);
            -webkit-backdrop-filter: blur(8px);
        }

        .search-box-wrapper input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.25);
            background: #ffffff;
        }

        /* Search Dropdown Styles */
        .search-dropdown {
            position: absolute;
            top: calc(100% + 8px);
            left: 0;
            width: 100%;
            background: #ffffff;
            border-radius: 12px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.15);
            z-index: 1000;
            display: none;
            max-height: 350px;
            overflow-y: auto;
            border: 1px solid var(--border-card);
            text-align: left;
        }
        
        .search-dropdown.active {
            display: block;
            animation: fadeInCard 0.2s ease forwards;
        }
        
        .search-dropdown-item {
            padding: 14px 20px;
            cursor: pointer;
            border-bottom: 1px solid var(--border-card);
            color: var(--text-light);
            display: flex;
            align-items: center;
            transition: background 0.2s, color 0.2s;
            text-decoration: none;
            font-size: 0.95rem;
            font-weight: 500;
        }
        
        .search-dropdown-item:last-child {
            border-bottom: none;
        }
        
        .search-dropdown-item:hover, .search-dropdown-item.focused {
            background: var(--bg-light);
            color: var(--primary);
        }
        
        .search-dropdown-empty {
            padding: 16px 20px;
            color: var(--text-gray);
            text-align: center;
            font-size: 0.95rem;
        }

        .category-chips {
            display: flex;
            flex-wrap: wrap;
            gap: 0.6rem;
            justify-content: center;
        }

        .chip {
            background: rgba(15, 23, 42, 0.03);
            border: 1px solid var(--border-card);
            color: var(--text-gray);
            padding: 0.5rem 1.2rem;
            border-radius: 100px;
            cursor: pointer;
            font-size: 0.85rem;
            font-weight: 600;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
        }

        .chip:hover {
            color: var(--text-light);
            background: rgba(15, 23, 42, 0.06);
            transform: translateY(-1px);
        }

        .chip.active {
            background: var(--primary);
            color: var(--text-dark);
            border-color: var(--primary);
            box-shadow: 0 4px 12px rgba(5, 150, 105, 0.2);
        }

        .tab-btn.hide {
            display: none !important;
        }

        @media (max-width: 768px) {
            body {
                padding: 1.5rem 0.8rem;
            }
            header h1 {
                font-size: 2rem;
            }
            header p {
                font-size: 0.95rem;
            }
            .desktop-text {
                display: none;
            }
            .mobile-text {
                display: inline;
            }
            .tabs-container {
                padding: 0.4rem 0.8rem;
                scroll-snap-type: x mandatory;
                -webkit-overflow-scrolling: touch;
            }
            .tabs {
                margin: 0; /* Align to the start of the scroll container on mobile */
            }
            .tab-btn {
                padding: 0.6rem 1rem;
                font-size: 0.85rem;
                scroll-snap-align: start;
            }
            .calc-wrapper {
                padding: 1.5rem 1.2rem !important;
                border-radius: 20px;
                gap: 1.8rem !important;
            }
            .result-panel {
                padding: 1.5rem !important;
            }
            .big-number {
                font-size: 2.8rem !important;
            }
            .promo-banner {
                padding: 1.5rem !important;
                border-radius: 18px;
            }
        }

        /* Main Section Card */
        .calc-wrapper {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: 28px;
            padding: 3rem;
            backdrop-filter: blur(20px);
            -webkit-backdrop-filter: blur(20px);
            box-shadow: 0 15px 35px -10px rgba(15, 23, 42, 0.05);
            display: none;
            grid-template-columns: 1.2fr 1fr;
            gap: 3.5rem;
            position: relative;
            overflow: hidden;
        }

        .calc-wrapper.active {
            display: grid;
            animation: slideUp 0.4s cubic-bezier(0.16, 1, 0.3, 1) forwards;
        }

        @keyframes slideUp {
            from { opacity: 0; transform: translateY(20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        @media (max-width: 900px) {
            .calc-wrapper {
                grid-template-columns: 1fr;
                padding: 2rem;
                gap: 2.5rem;
            }
        }

        /* Form & Inputs styling */
        .panel-title {
            font-family: 'Outfit', sans-serif;
            font-size: 1.6rem;
            font-weight: 700;
            margin-bottom: 2rem;
            color: var(--text-light);
            display: flex;
            align-items: center;
            gap: 0.8rem;
        }

        .panel-title::before {
            content: '';
            display: inline-block;
            width: 5px;
            height: 1.5rem;
            background: var(--primary);
            border-radius: 10px;
        }

        .panel-reset-btn {
            margin-left: auto;
            background: rgba(5, 150, 105, 0.08);
            color: var(--primary);
            border: 1px solid rgba(5, 150, 105, 0.2);
            border-radius: 6px;
            padding: 5px 12px;
            font-size: 0.85rem;
            font-weight: 600;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            gap: 6px;
            font-family: 'Plus Jakarta Sans', sans-serif;
        }
        .panel-reset-btn:hover {
            background: var(--primary);
            color: #ffffff;
        }

        .input-group {
            margin-bottom: 1.8rem;
        }

        .input-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.6rem;
        }

        .input-header label {
            font-size: 0.95rem;
            font-weight: 600;
            color: var(--text-gray);
        }

        .input-control-wrapper {
            position: relative;
            display: flex;
            align-items: center;
        }

        .input-control-wrapper input {
            width: 100%;
            background: #ffffff;
            border: 1px solid var(--border-card);
            padding: 1rem 1.2rem;
            padding-right: 4.5rem; /* Ensure input text doesn't overlap suffix */
            border-radius: 14px;
            color: var(--text-light);
            font-size: 1.2rem;
            font-weight: 600;
            transition: all 0.3s ease;
        }

        /* Hide browser up/down spinners on numeric inputs */
        input[type="number"]::-webkit-inner-spin-button, 
        input[type="number"]::-webkit-outer-spin-button { 
            -webkit-appearance: none !important; 
            display: none !important;
            margin: 0 !important; 
        }
        input[type="number"] {
            -moz-appearance: textfield !important;
            appearance: textfield !important;
        }

        .input-control-wrapper input:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.25);
            background: #ffffff;
        }

        .input-control-wrapper .suffix {
            position: absolute;
            right: 1.2rem;
            font-weight: 700;
            font-size: 0.95rem;
            color: var(--text-gray);
            background: rgba(15, 23, 42, 0.04);
            padding: 0.2rem 0.5rem;
            border-radius: 6px;
            pointer-events: none;
        }

        /* Toggle Switches */
        .toggle-container {
            display: flex;
            align-items: center;
            gap: 0.5rem;
            background: rgba(15, 23, 42, 0.04);
            border: 1px solid var(--border-card);
            padding: 0.3rem;
            border-radius: 8px;
        }

        .toggle-btn {
            background: transparent;
            border: none;
            color: var(--text-gray);
            padding: 0.3rem 0.8rem;
            border-radius: 6px;
            cursor: pointer;
            font-size: 0.8rem;
            font-weight: 700;
            transition: all 0.2s ease;
        }

        .toggle-btn.active {
            background: var(--text-light);
            color: var(--bg-dark);
        }

        /* Segmented Control Button Filters */
        .segmented-control {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 0.5rem;
            background: rgba(15, 23, 42, 0.05);
            padding: 0.4rem;
            border-radius: 14px;
            border: 1px solid var(--border-card);
            margin-bottom: 2rem;
        }

        .segment-btn {
            background: transparent;
            border: none;
            color: var(--text-gray);
            padding: 0.7rem;
            font-size: 0.85rem;
            font-weight: 700;
            border-radius: 10px;
            cursor: pointer;
            transition: all 0.2s ease;
            text-align: center;
        }

        .segment-btn:hover {
            color: var(--text-light);
        }

        .segment-btn.active {
            background: #ffffff;
            color: var(--primary);
            box-shadow: 0 2px 8px rgba(15, 23, 42, 0.05);
        }

        /* Result Panel UI */
        .result-panel {
            background: rgba(15, 23, 42, 0.02);
            border: 1px solid var(--border-card);
            border-radius: 20px;
            padding: 2.5rem;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            text-align: center;
            position: relative;
        }

        .result-header {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--text-gray);
            text-transform: uppercase;
            letter-spacing: 0.1em;
            margin-bottom: 0.8rem;
        }

        .big-number {
            font-family: 'Outfit', sans-serif;
            font-size: 4.5rem;
            font-weight: 800;
            line-height: 1;
            margin: 0.5rem 0;
            background: linear-gradient(135deg, var(--text-light) 30%, var(--cyan) 100%);
            -webkit-background-clip: text;
            -webkit-text-fill-color: transparent;
            filter: drop-shadow(0 0 15px rgba(6, 182, 212, 0.2));
            transition: all 0.3s ease;
        }

        .status-pill {
            display: inline-block;
            padding: 0.5rem 1.5rem;
            border-radius: 50px;
            font-size: 0.85rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-bottom: 1.5rem;
            transition: all 0.3s ease;
        }

        .status-pill.optimal {
            background: rgba(16, 185, 129, 0.15);
            color: var(--success);
            border: 1px solid rgba(16, 185, 129, 0.3);
            box-shadow: 0 0 15px rgba(16, 185, 129, 0.1);
        }

        .status-pill.warning {
            background: rgba(245, 158, 11, 0.15);
            color: var(--warning);
            border: 1px solid rgba(245, 158, 11, 0.3);
            box-shadow: 0 0 15px rgba(245, 158, 11, 0.1);
        }

        .status-pill.danger {
            background: rgba(239, 68, 68, 0.15);
            color: var(--danger);
            border: 1px solid rgba(239, 68, 68, 0.3);
            box-shadow: 0 0 15px rgba(239, 68, 68, 0.1);
        }

        .result-desc {
            color: var(--text-gray);
            font-size: 0.95rem;
            line-height: 1.6;
            margin-top: 1rem;
            max-width: 320px;
        }

        /* SVG Dynamic Gauges */
        .gauge-svg-wrapper {
            position: relative;
            width: 200px;
            height: 110px;
            margin-bottom: 1rem;
        }

        .gauge-meter {
            fill: none;
            stroke-width: 12;
            stroke-linecap: round;
        }

        .gauge-bg {
            stroke: rgba(15, 23, 42, 0.06);
        }

        .gauge-fill {
            stroke: url(#cyan-green-grad);
            stroke-dasharray: 283; /* Half circumference is ~283 */
            stroke-dashoffset: 283; /* Initially empty */
            transition: stroke-dashoffset 0.6s cubic-bezier(0.16, 1, 0.3, 1);
        }

        .gauge-indicator {
            position: absolute;
            bottom: 0;
            left: 50%;
            width: 4px;
            height: 80px;
            background: var(--text-light);
            border-radius: 10px;
            transform-origin: bottom center;
            transform: translateX(-50%) rotate(-90deg); /* Range: -90deg (0) to 90deg (2.0) */
            transition: transform 0.6s cubic-bezier(0.16, 1, 0.3, 1);
            box-shadow: 0 2px 5px rgba(15, 23, 42, 0.15);
        }

        .gauge-center-dot {
            position: absolute;
            bottom: -6px;
            left: 50%;
            width: 14px;
            height: 14px;
            background: var(--text-light);
            border-radius: 50%;
            transform: translateX(-50%);
            box-shadow: 0 2px 5px rgba(0,0,0,0.1);
        }

        /* Dynamic Cards for Valve Recommendations */
        .info-card {
            background: rgba(15, 23, 42, 0.02);
            border: 1px solid var(--border-card);
            border-radius: 14px;
            padding: 1.2rem;
            width: 100%;
            margin-top: 1.5rem;
            text-align: left;
        }

        .info-card h3, .info-card h4 {
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--cyan);
            margin-bottom: 0.5rem;
            text-transform: uppercase;
            letter-spacing: 0.05em;
        }

        .info-card p {
            font-size: 0.85rem;
            color: var(--text-gray);
            line-height: 1.5;
        }

        /* Promotional/Traffic Conversion Funnel Banner */
        .promo-banner {
            background: linear-gradient(135deg, rgba(16, 185, 129, 0.05) 0%, rgba(6, 182, 212, 0.05) 100%);
            border: 1px solid var(--border-card);
            border-radius: 24px;
            padding: 2.5rem 3rem;
            display: flex;
            justify-content: space-between;
            align-items: center;
            gap: 2rem;
            backdrop-filter: blur(10px);
            box-shadow: 0 15px 30px rgba(0,0,0,0.2);
            border-left: 5px solid var(--primary);
            grid-column: 1 / -1; /* Spans all columns in grid */
        }

        .promo-text h3 {
            font-family: 'Outfit', sans-serif;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 0.4rem;
        }

        .promo-text p {
            color: var(--text-gray);
            font-size: 0.95rem;
            max-width: 600px;
        }

        .promo-actions {
            display: flex;
            gap: 1rem;
            flex-shrink: 0;
        }

        .promo-btn {
            background: linear-gradient(135deg, var(--primary) 0%, var(--cyan) 100%);
            color: var(--text-dark);
            border: none;
            padding: 1rem 2rem;
            border-radius: 14px;
            font-weight: 800;
            font-size: 1rem;
            cursor: pointer;
            text-decoration: none;
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            display: inline-flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 10px 20px rgba(16, 185, 129, 0.25);
        }

        .promo-btn:hover {
            box-shadow: 0 15px 25px rgba(16, 185, 129, 0.4);
            transform: translateY(-2px);
        }

        .promo-btn-secondary {
            background: rgba(15, 23, 42, 0.04);
            border: 1px solid var(--border-card);
            color: var(--text-light);
            padding: 1rem 2rem;
            border-radius: 14px;
            font-weight: 600;
            font-size: 1rem;
            cursor: pointer;
            text-decoration: none;
            transition: all 0.3s ease;
        }

        .promo-btn-secondary:hover {
            background: rgba(15, 23, 42, 0.08);
            border-color: var(--text-gray);
        }

        @media (max-width: 900px) {
            .promo-banner {
                flex-direction: column;
                text-align: center;
                padding: 2rem;
            }
            .promo-actions {
                width: 100%;
                flex-direction: column;
            }
            .promo-btn, .promo-btn-secondary {
                width: 100%;
                justify-content: center;
            }
        }

        /* AdSpace placeholders */
        .ad-space-placeholder {
            margin: 0 auto;
            width: 100%;
            max-width: 728px;
            height: 90px;
            background: rgba(255, 255, 255, 0.01);
            border: 1px dashed var(--border-card);
            border-radius: 12px;
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 0.8rem;
            color: rgba(255,255,255,0.15);
            text-transform: uppercase;
            letter-spacing: 0.15em;
        }

        /* Footer styling */
        footer {
            text-align: center;
            margin-top: 5rem;
            padding-top: 2rem;
            border-top: 1px solid rgba(15, 23, 42, 0.08);
            color: var(--text-muted);
            font-size: 0.85rem;
        }

        footer a {
            color: var(--text-secondary);
            text-decoration: none;
            transition: color 0.2s;
        }

        footer a:hover {
            color: var(--primary);
        }

        /* Select styling */
        .input-control-wrapper select {
            width: 100%;
            background: #ffffff;
            border: 1px solid var(--border-card);
            padding: 1rem 1.2rem;
            border-radius: 14px;
            color: var(--text-light);
            font-size: 1.05rem;
            font-weight: 600;
            transition: all 0.3s ease;
            appearance: none;
            cursor: pointer;
        }

        .input-control-wrapper select:focus {
            outline: none;
            border-color: var(--primary);
            box-shadow: 0 0 0 3px rgba(5, 150, 105, 0.25);
            background: #ffffff;
        }

        .select-arrow-wrapper {
            position: relative;
            width: 100%;
        }

        .select-arrow-wrapper::after {
            content: '▼';
            font-size: 0.8rem;
            color: var(--text-gray);
            position: absolute;
            right: 1.2rem;
            top: 50%;
            transform: translateY(-50%);
            pointer-events: none;
        }

        /* Accordion Collapsible */
        .accordion {
            background: rgba(15, 23, 42, 0.02);
            border: 1px solid var(--border-card);
            border-radius: 16px;
            margin-top: 1.5rem;
            overflow: hidden;
            transition: all 0.3s ease;
        }

        .accordion-header {
            padding: 1rem 1.2rem;
            font-size: 0.95rem;
            font-weight: 700;
            color: var(--cyan);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
            user-select: none;
            transition: background 0.2s ease;
        }

        .accordion-header:hover {
            background: rgba(15, 23, 42, 0.04);
        }

        .accordion-header .icon {
            transition: transform 0.3s ease;
        }

        .accordion.open .accordion-header .icon {
            transform: rotate(180deg);
        }

        .accordion-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            padding: 0 1.2rem;
        }

        .accordion.open .accordion-body {
            max-height: 600px;
            padding: 1rem 1.2rem;
            border-top: 1px solid var(--border-card);
        }

        .estimator-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
        }

        .estimator-grid .input-group {
            margin-bottom: 0.8rem;
        }

        @media (max-width: 480px) {
            .estimator-grid {
                grid-template-columns: 1fr;
            }
        }

        .estimator-btn {
            background: var(--cyan);
            color: var(--text-dark);
            border: none;
            padding: 0.7rem 1.2rem;
            border-radius: 10px;
            font-weight: 800;
            font-size: 0.9rem;
            cursor: pointer;
            margin-top: 1rem;
            transition: all 0.2s ease;
            width: 100%;
        }

        .estimator-btn:hover {
            opacity: 0.9;
            transform: translateY(-1px);
        }

        /* Tank badges */
        .tank-badge {
            display: inline-flex;
            align-items: center;
            gap: 0.4rem;
            padding: 0.3rem 0.6rem;
            border-radius: 6px;
            font-size: 0.75rem;
            font-weight: 800;
            text-transform: uppercase;
            letter-spacing: 0.05em;
            margin-left: 0.8rem;
        }

        .tank-a {
            background: rgba(6, 182, 212, 0.15);
            color: var(--cyan);
            border: 1px solid rgba(6, 182, 212, 0.3);
        }

        .tank-b {
            background: rgba(245, 158, 11, 0.15);
            color: var(--warning);
            border: 1px solid rgba(245, 158, 11, 0.3);
        }

        .tank-ab {
            background: rgba(16, 185, 129, 0.15);
            color: var(--success);
            border: 1px solid rgba(16, 185, 129, 0.3);
        }

        /* Floating Feedback FAB */
        .feedback-fab {
            position: fixed;
            bottom: 2rem;
            right: 2rem;
            background: #ffffff;
            backdrop-filter: blur(10px);
            -webkit-backdrop-filter: blur(10px);
            border: 1px solid var(--primary);
            color: var(--text-light);
            box-shadow: 0 8px 25px rgba(15, 23, 42, 0.08);
            padding: 0.8rem 1.3rem;
            border-radius: 50px;
            font-size: 0.9rem;
            font-weight: 700;
            text-decoration: none;
            display: flex;
            align-items: center;
            gap: 0.5rem;
            box-shadow: 0 8px 25px var(--primary-glow);
            transition: all 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            z-index: 1000;
            cursor: pointer;
            animation: pulse-border 2.5s infinite;
        }

        .feedback-fab:hover {
            transform: translateY(-3px) scale(1.03);
            border-color: var(--cyan);
            box-shadow: 0 12px 30px rgba(2, 132, 199, 0.12);
        }

        @keyframes pulse-border {
            0% {
                box-shadow: 0 8px 25px var(--primary-glow), 0 0 0 0 rgba(5, 150, 105, 0.4);
            }
            70% {
                box-shadow: 0 8px 25px var(--primary-glow), 0 0 0 10px rgba(5, 150, 105, 0);
            }
            100% {
                box-shadow: 0 8px 25px var(--primary-glow), 0 0 0 0 rgba(5, 150, 105, 0);
            }
        }

        /* Consolidated SPA Styles */
        .search-container {
            position: relative;
            width: 100%;
        }
        .autocomplete-list {
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: #ffffff;
            border: 1px solid var(--border-card);
            border-radius: 14px;
            margin-top: 0.4rem;
            max-height: 200px;
            overflow-y: auto;
            z-index: 50;
            box-shadow: 0 10px 25px rgba(15,23,42,0.08);
            display: none;
        }
        .autocomplete-item {
            padding: 0.8rem 1.2rem;
            cursor: pointer;
            transition: background 0.2s ease;
            border-bottom: 1px solid rgba(15,23,42,0.03);
            color: var(--text-light);
            text-align: left;
        }
        .autocomplete-item:last-child {
            border-bottom: none;
        }
        .autocomplete-item:hover {
            background: rgba(5, 150, 105, 0.08);
            color: var(--primary);
        }
        .spectrum-bar-display {
            display: flex;
            height: 24px;
            border-radius: 12px;
            overflow: hidden;
            margin-top: 1rem;
            border: 1px solid var(--border-card);
            background: rgba(15, 23, 42, 0.03);
        }
        .spectrum-segment {
            height: 100%;
            transition: width 0.3s ease;
        }
        .calc-wrapper table {
            width: 100%;
            border-collapse: collapse;
            margin-top: 0.5rem;
        }
        .calc-wrapper th, .calc-wrapper td {
            padding: 0.75rem 1rem;
            text-align: left;
            border-bottom: 1px solid var(--border-card);
            font-size: 0.9rem;
        }
        .calc-wrapper th {
            color: var(--text-gray);
            font-weight: 600;
            text-transform: uppercase;
            font-size: 0.75rem;
            letter-spacing: 0.05em;
        }
        .calc-wrapper td {
            color: var(--text-light);
        }
        .calc-wrapper tr:last-child td {
            border-bottom: none;
        }
        .slider-group {
            margin-bottom: 1rem;
            width: 100%;
        }
        .slider-header {
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            font-weight: 600;
            color: var(--text-gray);
            margin-bottom: 0.4rem;
        }
        .slider-group input[type="range"] {
            width: 100%;
            accent-color: var(--primary);
        }
        .tab-content {
            display: none;
            grid-column: span 2;
            grid-template-columns: 1.2fr 1fr;
            gap: 3.5rem;
            width: 100%;
        }
        .tab-content.active {
            display: grid;
        }
        @media (max-width: 900px) {
            .tab-content {
                grid-column: span 1;
                grid-template-columns: 1fr;
                gap: 2.5rem;
            }
            .tab-content.active {
                display: grid;
            }
        }
        /* Modal Styles */
        .modal-overlay {
            position: fixed;
            top: 0; left: 0; right: 0; bottom: 0;
            background: rgba(15, 23, 42, 0.7);
            backdrop-filter: blur(8px);
            z-index: 2000;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .modal-content {
            background: #ffffff;
            border: 1px solid var(--border-card);
            border-radius: 20px;
            width: 460px;
            max-width: 90%;
            padding: 28px;
            box-shadow: 0 20px 40px rgba(15, 23, 42, 0.15);
            position: relative;
            animation: modalFadeIn 0.3s cubic-bezier(0.16, 1, 0.3, 1);
            color: var(--text-light);
            text-align: left;
        }

        @keyframes modalFadeIn {
            from { opacity: 0; transform: translateY(-20px); }
            to { opacity: 1; transform: translateY(0); }
        }

        .modal-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }

        .modal-title {
            font-size: 1.15rem;
            font-weight: 700;
            color: var(--text-light);
        }

        .modal-close {
            background: none;
            border: none;
            color: var(--text-gray);
            font-size: 24px;
            cursor: pointer;
            transition: color 0.2s;
            line-height: 1;
        }

        .modal-close:hover {
            color: var(--primary);
        }

        .modal-subtitle {
            font-size: 0.8rem;
            color: var(--text-gray);
            margin-bottom: 20px;
            line-height: 1.5;
        }

        .btn-submit {
            width: 100%;
            background: var(--primary);
            border: 1px solid rgba(255, 255, 255, 0.1);
            color: #fff;
            font-size: 0.95rem;
            font-weight: 700;
            padding: 12px;
            border-radius: 8px;
            cursor: pointer;
            transition: all 0.3s;
            box-shadow: 0 4px 12px var(--primary-glow);
        }

        .btn-submit:hover {
            background: var(--cyan);
            transform: translateY(-1px);
            box-shadow: 0 6px 16px rgba(2, 132, 199, 0.2);
        }

        /* Academic Guide Accordion Styling */
        .academic-guide.accordion {
            padding: 0;
            background: rgba(255, 255, 255, 0.55);
            border: 1px solid var(--border-card);
            border-radius: 16px;
            margin-top: 1.5rem;
            width: 100%;
            text-align: left;
            box-shadow: inset 0 0 12px rgba(255, 255, 255, 0.5);
            overflow: hidden;
            transition: all 0.3s ease;
        }
        .academic-guide.accordion.open {
            background: #ffffff;
            box-shadow: 0 10px 25px rgba(15, 23, 42, 0.03);
        }
        .academic-guide .accordion-header {
            padding: 1rem 1.2rem;
            user-select: none;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            transition: background 0.2s ease;
        }
        .academic-guide .accordion-header:hover {
            background: rgba(15, 23, 42, 0.02);
        }
        .academic-guide .accordion-body {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.4s cubic-bezier(0.4, 0, 0.2, 1);
            padding: 0 1.2rem;
        }
        .academic-guide.accordion.open .accordion-body {
            max-height: 3500px;
            padding: 1.2rem;
            border-top: 1px solid var(--border-card);
        }
        .academic-guide h3 {
            font-family: 'Outfit', sans-serif;
            font-size: 1.15rem;
            color: var(--text-light);
            margin-bottom: 1rem;
            border-bottom: 2px solid var(--primary-glow);
            padding-bottom: 0.4rem;
        }
        .academic-guide h4 {
            font-size: 0.95rem;
            color: var(--cyan);
            margin-top: 1.2rem;
            margin-bottom: 0.5rem;
            font-weight: 700;
        }
        .academic-guide p {
            font-size: 0.85rem;
            color: var(--text-gray);
            line-height: 1.6;
            margin-bottom: 0.8rem;
        }
        .academic-guide ul {
            margin-left: 1.2rem;
            margin-bottom: 0.8rem;
            font-size: 0.85rem;
            color: var(--text-gray);
            line-height: 1.6;
        }
        .academic-guide li {
            margin-bottom: 0.3rem;
        }
        .academic-guide code {
            background: rgba(15, 23, 42, 0.05);
            padding: 0.15rem 0.35rem;
            border-radius: 4px;
            font-family: monospace;
            font-size: 0.8rem;
            color: var(--text-light);
        }

        
        /* Dashboard Home Layout */
        .dashboard-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 1.5rem;
            margin-top: 1.5rem;
            width: 100%;
        }
        .dashboard-card {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: 20px;
            padding: 1.8rem;
            cursor: pointer;
            transition: all 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex;
            flex-direction: column;
            gap: 0.8rem;
            text-align: left;
            box-shadow: 0 4px 20px rgba(15, 23, 42, 0.02);
            position: relative;
            overflow: hidden;
            text-decoration: none;
        }
        .dashboard-card:hover {
            transform: translateY(-6px);
            box-shadow: 0 16px 36px rgba(15, 23, 42, 0.08);
            border-color: var(--primary);
            background: #ffffff;
        }
        .dashboard-card .card-icon {
            font-size: 2.2rem;
            margin-bottom: 0.2rem;
        }
        .dashboard-card h3 {
            font-family: 'Outfit', sans-serif;
            font-size: 1.2rem;
            font-weight: 700;
            color: var(--text-light);
            margin: 0;
        }
        .dashboard-card p {
            font-size: 0.85rem;
            color: var(--text-gray);
            line-height: 1.5;
            margin: 0;
        }
        
        /* Language Toggle Helpers for Dashboard */
        .lang-text-ko, .lang-text-en {
            display: inline;
        }
        .lang-block-ko, .lang-block-en {
            display: block;
        }
        
        @keyframes fadeInCard {
            from {
                opacity: 0;
                transform: scale(0.96) translateY(5px);
            }
            to {
                opacity: 1;
                transform: scale(1) translateY(0);
            }
        }

        /* Dynamic VPD Matrix Grid Styles */
        .vpd-matrix-container {
            background: var(--bg-card);
            border: 1px solid var(--border-card);
            border-radius: 24px;
            padding: 2.2rem;
            margin-top: 2rem;
            width: 100%;
            grid-column: 1 / -1;
            text-align: left;
            box-shadow: 0 4px 30px rgba(0, 0, 0, 0.03);
            backdrop-filter: blur(10px);
        }

        .vpd-matrix-title {
            font-family: 'Outfit', sans-serif;
            font-size: 1.4rem;
            font-weight: 700;
            color: var(--text-light);
            margin-bottom: 0.3rem;
        }

        .vpd-matrix-subtitle {
            font-size: 0.9rem;
            color: var(--text-gray);
            margin-bottom: 1.5rem;
        }

        .vpd-matrix-table-wrapper {
            width: 100%;
            overflow-x: auto;
            border-radius: 14px;
            border: 1px solid var(--border-card);
            background: rgba(255, 255, 255, 0.4);
        }

        .vpd-matrix-table {
            width: 100%;
            border-collapse: collapse;
            font-size: 0.78rem;
            font-family: 'Plus Jakarta Sans', sans-serif;
            min-width: 800px;
        }

        .vpd-matrix-table th {
            background: rgba(15, 23, 42, 0.03);
            border-bottom: 1px solid var(--border-card);
            border-right: 1px solid var(--border-card);
            color: var(--text-light);
            font-weight: 600;
            padding: 0.6rem 0.5rem;
            text-align: center;
        }

        .vpd-matrix-table td {
            border-bottom: 1px solid var(--border-card);
            border-right: 1px solid var(--border-card);
            padding: 0.5rem 0.4rem;
            text-align: center;
            color: var(--text-light);
            transition: all 0.2s ease;
        }

        .vpd-matrix-table tr:last-child td {
            border-bottom: none;
        }

        .vpd-matrix-table th:last-child, .vpd-matrix-table td:last-child {
            border-right: none;
        }

        .vpd-cell-too-low {
            background: rgba(2, 132, 199, 0.08) !important;
            color: #0284c7 !important;
        }

        .vpd-cell-optimal {
            background: rgba(5, 150, 105, 0.12) !important;
            color: #059669 !important;
            font-weight: 700;
        }

        .vpd-cell-warning {
            background: rgba(217, 119, 6, 0.08) !important;
            color: #b45309 !important;
        }

        .vpd-cell-danger {
            background: rgba(220, 38, 38, 0.08) !important;
            color: #b91c1c !important;
        }

        .vpd-legend {
            display: flex;
            flex-wrap: wrap;
            gap: 1.2rem;
            margin-top: 1.2rem;
            font-size: 0.8rem;
        }

        .vpd-legend-item {
            display: flex;
            align-items: center;
            gap: 0.4rem;
        }

        .vpd-legend-color {
            width: 16px;
            height: 16px;
            border-radius: 4px;
            border: 1px solid rgba(15, 23, 42, 0.1);
        }
        .vpd-legend-color.vpd-cell-too-low {
            background: rgba(2, 132, 199, 0.2) !important;
        }
        .vpd-legend-color.vpd-cell-optimal {
            background: rgba(5, 150, 105, 0.3) !important;
        }
        .vpd-legend-color.vpd-cell-warning {
            background: rgba(217, 119, 6, 0.2) !important;
        }
        .vpd-legend-color.vpd-cell-danger {
            background: rgba(220, 38, 38, 0.2) !important;
        }

        /* My Farm Profile Drawer Styles */
        .farm-profile-drawer {
            position: fixed;
            top: 0;
            right: 0;
            width: 100%;
            height: 100%;
            z-index: 1000;
            display: flex;
            justify-content: flex-end;
        }

        .drawer-overlay {
            position: absolute;
            top: 0;
            left: 0;
            width: 100%;
            height: 100%;
            background: rgba(15, 23, 42, 0.4);
            backdrop-filter: blur(4px);
        }

        .drawer-content {
            position: relative;
            width: 100%;
            max-width: 420px;
            height: 100%;
            background: var(--bg-card);
            border-left: 1px solid var(--border-card);
            box-shadow: -10px 0 40px rgba(0, 0, 0, 0.1);
            padding: 2rem;
            display: flex;
            flex-direction: column;
            overflow-y: auto;
            animation: slideInDrawer 0.3s cubic-bezier(0.16, 1, 0.3, 1) forwards;
            backdrop-filter: blur(20px);
        }

        @keyframes slideInDrawer {
            from {
                transform: translateX(100%);
            }
            to {
                transform: translateX(0);
            }
        }

        .drawer-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 0.5rem;
        }

        .drawer-header h3 {
            font-family: 'Outfit', sans-serif;
            font-size: 1.3rem;
            font-weight: 700;
            color: var(--text-light);
        }

        .drawer-close-btn {
            background: transparent;
            border: none;
            font-size: 1.3rem;
            color: var(--text-gray);
            cursor: pointer;
            padding: 0.5rem;
            border-radius: 50%;
            display: flex;
            align-items: center;
            justify-content: center;
            transition: all 0.2s ease;
        }

        .drawer-close-btn:hover {
            background: rgba(15, 23, 42, 0.05);
            color: var(--text-light);
        }

        .drawer-subtitle {
            font-size: 0.78rem;
            color: var(--text-gray);
            line-height: 1.4;
        }

        .drawer-form .input-group {
            display: flex;
            flex-direction: column;
            gap: 0.3rem;
        }