/* --- CSS Variables & Reset --- */
        :root {
            --primary-color: #4f46e5; /* Indigo/Blue */
            --primary-hover: #4338ca;
            --secondary-color: #f97316; /* Orange accent */
            --bg-color: #ffffff;
            --bg-offset: #f3f4f6;
            --text-main: #1f2937;
            --text-muted: #6b7280;
            --border-color: #e5e7eb;
            --card-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05), 0 2px 4px -1px rgba(0, 0, 0, 0.03);
            --card-hover-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1), 0 4px 6px -2px rgba(0, 0, 0, 0.05);
            --radius-md: 0.5rem;
            --radius-lg: 0.75rem;
            --radius-full: 9999px;
            --container-width: 1200px;
        }

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

        body {
            font-family: 'Inter', sans-serif;
            color: var(--text-main);
            background-color: var(--bg-color);
            line-height: 1.5;
            -webkit-font-smoothing: antialiased;
        }

        a {
            text-decoration: none;
            color: inherit;
            transition: color 0.2s;
        }

        ul {
            list-style: none;
        }

        /* --- Utility Classes --- */
        .container {
            max-width: var(--container-width);
            margin: 0 auto;
            padding: 0 1.5rem;
        }

        .btn {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            padding: 0.6rem 1.2rem;
            font-weight: 500;
            border-radius: var(--radius-md);
            cursor: pointer;
            transition: all 0.2s ease;
            border: none;
            font-size: 0.95rem;
        }

        .btn-primary {
            background-color: var(--primary-color);
            color: white;
        }

        .btn-primary:hover {
            background-color: var(--primary-hover);
            transform: translateY(-1px);
        }

        .btn-outline {
            background-color: transparent;
            border: 1px solid var(--border-color);
            color: var(--text-main);
        }

        .btn-outline:hover {
            border-color: var(--text-main);
            background-color: var(--bg-offset);
        }

        /* --- Header / Navigation --- */
        header {
            background-color: rgba(255, 255, 255, 0.95);
            backdrop-filter: blur(10px);
            border-bottom: 1px solid var(--border-color);
            position: sticky;
            top: 0;
            z-index: 1000;
            height: 70px;
            display: flex;
            align-items: center;
        }

        .nav-container {
            display: flex;
            justify-content: space-between;
            align-items: center;
            width: 100%;
        }

        .logo {
            font-size: 1.25rem;
            font-weight: 700;
            color: var(--primary-color);
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .logo i {
            color: var(--secondary-color);
        }

        .nav-links {
            display: flex;
            gap: 2rem;
        }

        .nav-links a {
            font-size: 0.95rem;
            font-weight: 500;
            color: var(--text-muted);
        }

        .nav-links a:hover {
            color: var(--primary-color);
        }

        .header-actions {
            display: flex;
            gap: 1rem;
            align-items: center;
        }

        .mobile-menu-btn {
            display: none;
            font-size: 1.5rem;
            background: none;
            border: none;
            cursor: pointer;
            color: var(--text-main);
        }

        /* --- Hero Section (Split Layout) --- */
        .hero {
            padding: 2rem 0 4rem;
            background: linear-gradient(180deg, #fff 0%, #f9fafb 100%);
        }

        .hero-content-wrapper {
            display: flex;
            align-items: center;
            justify-content: space-between;
            gap: 4rem;
        }

        /* Left Side: Text & Search */
        .hero-left {
            flex: 1;
            text-align: left;
        }

        .hero-left h1 {
            font-size: 3.5rem;
            font-weight: 800;
            margin-bottom: 1.5rem;
            letter-spacing: -0.03em;
            line-height: 1.1;
            color: var(--text-main);
        }

        .hero-left p {
            font-size: 1.2rem;
            color: var(--text-muted);
            margin-bottom: 2.5rem;
            max-width: 550px;
        }

        .search-wrapper {
            position: relative;
            max-width: 100%;
        }

        .search-bar {
            width: 100%;
            padding: 1.2rem 1.5rem 1.2rem 3.5rem;
            font-size: 1.1rem;
            border: 2px solid var(--border-color);
            border-radius: var(--radius-full);
            outline: none;
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.05);
            transition: border-color 0.2s, box-shadow 0.2s;
        }

        .search-bar:focus {
            border-color: var(--primary-color);
            box-shadow: 0 10px 25px -5px rgba(79, 70, 229, 0.15);
        }

        .search-icon {
            position: absolute;
            left: 1.2rem;
            top: 50%;
            transform: translateY(-50%);
            color: var(--text-muted);
            font-size: 1.2rem;
        }

        /* Right Side: Scientific Calculator */
        .hero-right {
            flex: 0 0 400px; 
            display: flex;
            justify-content: flex-end;
        }

        .featured-calc-card {
            background: white;
            padding: 1.5rem;
            border-radius: 1rem;
            box-shadow: 0 20px 25px -5px rgba(0, 0, 0, 0.1), 0 10px 10px -5px rgba(0, 0, 0, 0.04);
            border: 1px solid var(--border-color);
            width: 100%;
            text-align: left;
        }

        .calc-header {
            display: flex;
            align-items: center;
            gap: 0.75rem;
            margin-bottom: 1rem;
            border-bottom: 1px solid var(--bg-offset);
            padding-bottom: 0.8rem;
        }

        .calc-header h3 {
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--primary-color);
        }

        .calc-header i {
            color: var(--secondary-color);
            font-size: 1.25rem;
        }

        /* Scientific Calculator Specific Styles */
        .sci-calc-display {
            width: 100%;
            height: 60px;
            background-color: #f3f4f6;
            border: 1px solid #e5e7eb;
            border-radius: 8px;
            margin-bottom: 1rem;
            padding: 0.75rem;
            text-align: right;
            font-family: 'Courier New', monospace; /* Monospace for numbers */
            font-size: 1.5rem;
            font-weight: 600;
            color: var(--text-main);
            overflow-x: auto;
        }

        .sci-calc-grid {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 8px;
        }

        .sci-btn {
            height: 45px;
            border: 1px solid var(--border-color);
            background-color: white;
            border-radius: 6px;
            cursor: pointer;
            font-weight: 600;
            font-size: 0.95rem;
            color: var(--text-main);
            transition: all 0.1s;
        }

        .sci-btn:hover {
            background-color: var(--bg-offset);
        }

        .sci-btn:active {
            transform: scale(0.95);
        }

        .sci-btn.operator {
            background-color: #eff6ff;
            color: var(--primary-color);
            border-color: #dbeafe;
        }
        
        .sci-btn.equals {
            background-color: var(--primary-color);
            color: white;
            border-color: var(--primary-color);
        }
        
        .sci-btn.equals:hover {
            background-color: var(--primary-hover);
        }

        .sci-btn.clear {
            background-color: #fee2e2;
            color: #b91c1c;
            border-color: #fecaca;
        }

        /* --- Categories Section --- */
        .categories {
            padding: 2rem 0;
            border-bottom: 1px solid var(--border-color);
            background-color: var(--bg-color);
        }

        .category-scroll {
            display: flex;
            gap: 0.75rem;
            overflow-x: auto;
            padding-bottom: 0.5rem;
            scrollbar-width: none;
        }
        
        .category-scroll::-webkit-scrollbar { display: none; }

        .cat-pill {
            background-color: var(--bg-offset);
            color: var(--text-main);
            padding: 0.6rem 1.2rem;
            border-radius: var(--radius-full);
            white-space: nowrap;
            font-weight: 500;
            font-size: 0.9rem;
            transition: all 0.2s;
            border: 1px solid transparent;
        }

        .cat-pill:hover, .cat-pill.active {
            background-color: #e0e7ff;
            color: var(--primary-color);
            border-color: #c7d2fe;
        }

        /* --- Calculators Grid Section --- */
        .calculators-section {
            padding: 4rem 0;
            background-color: var(--bg-color);
        }

        .section-header {
            margin-bottom: 2.5rem;
            display: flex;
            justify-content: space-between;
            align-items: flex-end;
        }

        .section-header h2 { font-size: 1.8rem; font-weight: 700; }
        .section-header p { color: var(--text-muted); margin-top: 0.5rem; }

        .calc-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
            gap: 2rem;
        }

        .calc-card {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            padding: 1rem;
            transition: all 0.3s ease;
            position: relative;
            cursor: pointer;
            display: flex;
            flex-direction: column;
            gap: 1rem;
        }

        .calc-card:hover {
            transform: translateY(-5px);
            box-shadow: var(--card-hover-shadow);
            border-color: #c7d2fe;
        }

        .card-icon {
            width: 50px;
            height: 50px;
            background-color: #eff6ff;
            color: var(--primary-color);
            border-radius: 12px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 1.5rem;
            transition: background-color 0.3s;
        }

        .calc-card:hover .card-icon {
            background-color: var(--primary-color);
            color: white;
        }

        .card-content h3 { font-size: 1.25rem; font-weight: 600; margin-bottom: 0.5rem; }
        .card-content p { color: var(--text-muted); font-size: 0.95rem; line-height: 1.5; }
        .card-arrow { margin-top: auto; color: var(--primary-color); font-weight: 600; font-size: 0.9rem; display: flex; align-items: center; gap: 0.5rem; }

        /* --- Features Section --- */
        .features {
            background-color: var(--bg-offset);
            padding: 5rem 0;
        }

        .features-grid {
            display: grid;
            grid-template-columns: repeat(3, 1fr);
            gap: 3rem;
            text-align: center;
        }

        .feature-item i {
            font-size: 2.5rem;
            color: var(--secondary-color);
            margin-bottom: 1.5rem;
        }
        .feature-item h3 { font-size: 1.5rem; margin-bottom: 1rem; }
        .feature-item p { color: var(--text-muted); font-size: 1.1rem; }

        /* --- Footer --- */
        footer {
            background-color: #111827;
            color: #d1d5db;
            padding: 4rem 0 2rem;
        }

        .footer-grid {
            display: grid;
            grid-template-columns: 1.5fr 1fr 1fr 1fr;
            gap: 3rem;
            margin-bottom: 3rem;
        }

        .footer-brand h2 {
            color: white;
            font-size: 1.25rem;
            margin-bottom: 1rem;
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }
        .footer-brand p { font-size: 0.9rem; max-width: 300px; }
        .footer-col h4 { color: white; margin-bottom: 1.2rem; font-size: 1rem; text-transform: uppercase; letter-spacing: 0.05em; }
        .footer-col ul li { margin-bottom: 0.8rem; }
        .footer-col ul li a:hover { color: white; text-decoration: underline; }

        .footer-bottom {
            border-top: 1px solid #374151;
            padding-top: 2rem;
            display: flex;
            justify-content: space-between;
            font-size: 0.85rem;
            color: #9ca3af;
        }

        /* --- Responsive Design --- */
        @media (max-width: 900px) {
            .hero-content-wrapper {
                flex-direction: column;
                text-align: center;
            }
            
            .hero-left {
                text-align: center;
                align-items: center;
                display: flex;
                flex-direction: column;
            }

            .hero-right {
                width: 100%;
                justify-content: center;
            }

            .features-grid { grid-template-columns: 1fr; gap: 2.5rem; }
            .footer-grid { grid-template-columns: 1fr 1fr; }
        }

        @media (max-width: 600px) {
            .hero-left h1 { font-size: 2.2rem; }
            .nav-links { display: none; }
            .mobile-menu-btn { display: block; }
            .header-actions .btn { display: none; }
            .section-header { flex-direction: column; align-items: flex-start; gap: 0.5rem; }
            .footer-grid { grid-template-columns: 1fr; }
            .footer-bottom { flex-direction: column; gap: 1rem; text-align: center; }
            .logo { font-size: 1.1rem; }
            
            /* Make Sci Calculator buttons smaller on mobile */
            .sci-btn { height: 40px; font-size: 0.85rem; }
            .sci-calc-display { font-size: 1.2rem; height: 50px; }
        }





         /* --- Breadcrumbs --- */
        .breadcrumbs {
            padding: 1.5rem 0;
            font-size: 0.9rem;
            color: var(--text-muted);
        }
        .breadcrumbs a { color: var(--primary-color); font-weight: 500; }
        .breadcrumbs a:hover { text-decoration: underline; }
        .separator { margin: 0 0.5rem; color: #d1d5db; }

        /* --- Page Hero --- */
        .page-hero { text-align: center; margin-bottom: 3rem; }
        .page-hero h1 { font-size: 2.5rem; font-weight: 800; color: var(--text-main); margin-bottom: 0.5rem; }
        .page-hero p { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

        /* --- Calculator Interface --- */
        .tool-container {
            background: white;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            margin-bottom: 4rem;
        }

        .tabs {
            display: flex;
            border-bottom: 1px solid var(--border-color);
            background: var(--bg-offset);
        }
        .tab-btn {
            flex: 1;
            padding: 1rem;
            border: none;
            background: transparent;
            font-weight: 600;
            color: var(--text-muted);
            cursor: pointer;
            border-bottom: 3px solid transparent;
            transition: all 0.2s;
        }
        .tab-btn.active {
            color: var(--primary-color);
            border-bottom-color: var(--primary-color);
            background: white;
        }
        .tab-btn:hover:not(.active) { color: var(--text-main); }

        .calc-body { padding: 2.5rem; }
        .tab-content { display: none; animation: fadeIn 0.3s ease; }
        .tab-content.active { display: block; }

        @keyframes fadeIn { from { opacity: 0; transform: translateY(5px); } to { opacity: 1; transform: translateY(0); } }

        .input-group { margin-bottom: 1.5rem; }
        .input-group label { display: block; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-main); }
        .input-row { display: flex; gap: 1rem; align-items: center; }
        
        .form-input {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            font-size: 1rem;
            font-family: inherit;
        }
        .form-input:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1); }

        .result-box {
            background-color: #eff6ff;
            border: 1px solid #bfdbfe;
            color: var(--primary-color);
            padding: 1.5rem;
            border-radius: var(--radius-md);
            margin-top: 2rem;
            text-align: center;
        }
        .result-value { font-size: 2rem; font-weight: 800; display: block; margin-top: 0.5rem; }

        /* --- Content Sections (SEO Content) --- */
        .content-section { margin-bottom: 4rem; }
        .content-section h2 { font-size: 1.75rem; margin-bottom: 1rem; color: var(--text-main); border-bottom: 2px solid var(--bg-offset); padding-bottom: 0.5rem; display: inline-block; }
        .content-section p { margin-bottom: 1rem; color: #374151; }
        
        .formula-box {
            background: var(--bg-offset);
            padding: 1.5rem;
            border-radius: var(--radius-md);
            margin: 1.5rem 0;
            font-family: 'Courier New', monospace;
            font-weight: 700;
            text-align: center;
            font-size: 1.2rem;
            border: 1px solid var(--border-color);
        }

        /* FAQ Accordion */
        .faq-item { border-bottom: 1px solid var(--border-color); }
        .faq-question {
            width: 100%;
            text-align: left;
            background: none;
            border: none;
            padding: 1.2rem 0;
            font-size: 1.1rem;
            font-weight: 600;
            color: var(--text-main);
            cursor: pointer;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        .faq-question:hover { color: var(--primary-color); }
        .faq-answer {
            max-height: 0;
            overflow: hidden;
            transition: max-height 0.3s ease;
            color: var(--text-muted);
        }
        .faq-answer p { padding-bottom: 1.2rem; }
        .faq-item.active .faq-answer { max-height: 200px; }
        .faq-item.active .faq-question i { transform: rotate(180deg); } 

        /* Mobile */
        @media (max-width: 600px) {
            .page-hero h1 { font-size: 2rem; }
            .input-row { flex-direction: column; align-items: stretch; }
            .calc-body { padding: 1.5rem; }
        }



        /* --- Hero --- */
        .page-hero { text-align: center; margin-bottom: 3rem; }
        .page-hero h1 { font-size: 2.5rem; font-weight: 800; color: var(--text-main); margin-bottom: 0.5rem; }
        .page-hero p { color: var(--text-muted); font-size: 1.1rem; max-width: 600px; margin: 0 auto; }

        /* --- Calculator Layout --- */
        .bmi-wrapper {
            display: grid;
            grid-template-columns: 1fr 1fr;
            /*gap: 2rem;*/
            background: white;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-lg);
            box-shadow: 0 10px 25px -5px rgba(0, 0, 0, 0.1);
            overflow: hidden;
            margin-bottom: 4rem;
        }

        .calc-inputs { padding: 2.5rem; border-right: 1px solid var(--border-color); }
        .calc-visuals { padding: 2.5rem; background-color: #f8fafc; display: flex; flex-direction: column; justify-content: center; }

        /* Unit Toggle */
        .unit-toggle {
            display: flex;
            background: var(--bg-offset);
            padding: 0.25rem;
            border-radius: var(--radius-md);
            margin-bottom: 2rem;
        }
        .unit-btn {
            flex: 1;
            border: none;
            background: transparent;
            padding: 0.75rem;
            border-radius: calc(var(--radius-md) - 2px);
            font-weight: 600;
            cursor: pointer;
            color: var(--text-muted);
            transition: all 0.2s;
        }
        .unit-btn.active { background: white; color: var(--primary-color); shadow: 0 1px 2px rgba(0,0,0,0.1); }

        /* Inputs */
        .input-group { margin-bottom: 1.5rem; }
        .input-group label { display: block; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-main); }
        .form-input {
            width: 100%;
            padding: 0.8rem;
            border: 1px solid var(--border-color);
            border-radius: var(--radius-md);
            font-size: 1rem;
        }
        .form-input:focus { outline: none; border-color: var(--primary-color); }
        
        .imperial-row { display: flex; gap: 1rem; }
        
        .btn-calc {
            width: 100%;
            padding: 1rem;
            background-color: var(--primary-color);
            color: white;
            border: none;
            border-radius: var(--radius-md);
            font-size: 1.1rem;
            font-weight: 600;
            cursor: pointer;
            transition: background 0.2s;
        }
        .btn-calc:hover { background-color: var(--primary-hover); }

        /* Visuals */
        .bmi-score-display { text-align: center; margin-bottom: 2rem; opacity: 0.5; filter: blur(2px); transition: all 0.3s; }
        .bmi-score-display.active { opacity: 1; filter: blur(0); }
        .score-number { font-size: 3.5rem; font-weight: 800; line-height: 1; display: block; }
        .score-label { font-size: 1.25rem; font-weight: 600; margin-top: 0.5rem; display: block; }
        
        /* Gauge Bar */
        .gauge-container { position: relative; height: 12px; background: #e5e7eb; border-radius: 6px; margin-top: 1rem; overflow: hidden; }
        .gauge-fill { height: 100%; width: 0%; transition: width 1s ease, background-color 0.3s; }
        
        .gauge-labels {
            display: flex;
            justify-content: space-between;
            font-size: 0.75rem;
            color: var(--text-muted);
            margin-top: 0.5rem;
            font-weight: 500;
        }

        .ideal-weight-text { margin-top: 1.5rem; font-size: 0.9rem; color: var(--text-muted); text-align: center; }


        /* SEO Content */
        .content-section { margin-bottom: 4rem; }
        .content-section h2 { font-size: 1.75rem; margin-bottom: 1rem; color: var(--text-main); border-bottom: 2px solid var(--bg-offset); padding-bottom: 0.5rem; }
        
        .bmi-table { width: 100%; border-collapse: collapse; margin: 1.5rem 0; box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05); }
        .bmi-table th, .bmi-table td { padding: 1rem; text-align: left; border-bottom: 1px solid var(--border-color); }
        .bmi-table th { background-color: var(--bg-offset); font-weight: 600; }

        /* Responsive */
        @media (max-width: 768px) {
            .bmi-wrapper { grid-template-columns: 1fr; }
            .calc-inputs { border-right: none; border-bottom: 1px solid var(--border-color); }
        }



        /* --- Calculator Layout --- */
.tool-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 2rem;
    margin-bottom: 3rem;
}

.card {
    background: white;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    padding: 2rem;
    box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
}

/* Inputs */
.input-group { margin-bottom: 1.5rem; }
.input-group label { display: block; font-weight: 600; margin-bottom: 0.5rem; color: var(--text-main); }
.input-row { display: flex; gap: 1rem; }

.form-input, .form-select {
    width: 100%;
    padding: 0.8rem;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-md);
    font-size: 1rem;
}
.form-input:focus, .form-select:focus { outline: none; border-color: var(--primary-color); box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1); }

.btn-calc {
    width: 100%;
    padding: 1rem;
    background-color: var(--primary-color);
    color: white;
    border: none;
    border-radius: var(--radius-md);
    font-size: 1.1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s;
}
.btn-calc:hover { background-color: var(--primary-hover); }

/* Results */
.result-card {
    background: var(--bg-offset);
    padding: 1.5rem;
    border-radius: var(--radius-md);
    margin-bottom: 1rem;
    text-align: center;
}
.result-label { font-size: 0.9rem; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.05em; font-weight: 600; }
.result-value { font-size: 2rem; font-weight: 800; color: var(--primary-color); margin-top: 0.25rem; }

.summary-grid {
    display: grid;
    grid-template-columns: 1fr 1fr;
    gap: 1rem;
    margin-top: 1rem;
}
.summary-item { background: white; padding: 1rem; border: 1px solid var(--border-color); border-radius: var(--radius-md); text-align: left; }
.summary-item small { display: block; color: var(--text-muted); font-size: 0.85rem; }
.summary-item strong { display: block; font-size: 1.1rem; color: var(--text-main); margin-top: 0.25rem; }

.btn-schedule {
    width: 100%;
    margin-top: 1.5rem;
    padding: 0.8rem;
    background-color: white;
    border: 2px solid var(--primary-color);
    color: var(--primary-color);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    transition: all 0.2s;
}
.btn-schedule:hover { background-color: var(--bg-offset); }

/* Amortization Table */
#schedule-container {
    display: none;
    margin-bottom: 4rem;
    animation: slideDown 0.4s ease;
}
@keyframes slideDown { from { opacity: 0; transform: translateY(-10px); } to { opacity: 1; transform: translateY(0); } }

.table-wrapper {
    max-height: 500px;
    overflow-y: auto;
    border: 1px solid var(--border-color);
    border-radius: var(--radius-lg);
    box-shadow: 0 4px 6px -1px rgba(0,0,0,0.05);
}

table { width: 100%; border-collapse: collapse; font-size: 0.95rem; }
th {
    background: var(--bg-offset);
    position: sticky; top: 0;
    padding: 1rem;
    text-align: right;
    font-weight: 600;
    border-bottom: 2px solid var(--border-color);
    color: var(--text-main);
    z-index: 10;
}
th:first-child { text-align: left; }
td { padding: 0.75rem 1rem; border-bottom: 1px solid var(--border-color); text-align: right; color: #4b5563; }
td:first-child { text-align: left; font-weight: 600; color: var(--text-main); }
tr:hover { background-color: #f9fafb; }

/* SEO Content */
.content-section { margin-bottom: 4rem; }
.content-section h2 { font-size: 1.75rem; margin-bottom: 1rem; color: var(--text-main); border-bottom: 2px solid var(--bg-offset); padding-bottom: 0.5rem; }
.content-section h3 { font-size: 1.25rem; margin: 1.5rem 0 0.5rem; color: var(--text-main); }
.formula-box { background: #f0fdf4; padding: 1.5rem; border: 1px solid #bbf7d0; border-radius: var(--radius-md); margin: 1rem 0; font-family: monospace; color: #166534; font-weight: 600; }

 
/* Responsive */
@media (max-width: 768px) {
    .tool-grid { grid-template-columns: 1fr; }
    .summary-grid { grid-template-columns: 1fr; }
}