.dark .featured-calc {
            background: #11243f;
        }
        .dark input, .dark select {
            background: #13223a;
            color: #f1f5f9;
            border-color: #26395a;
        }
        .dark input:focus {
            border-color: #7c3aed;
            box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.2);
        }
        .dark .demo-result {
            background: #052e16;
            border-color: #166534;
            color: #bbf7d0;
        }
        .dark .search-overlay {
            background: rgba(0, 0, 0, 0.8);
        }
        .dark .search-modal {
            background: #13223a;
            border-color: #26395a;
        }
        .dark .search-result-card {
            background: #13223a;
            border-color: #26395a;
        }
        .dark .search-result-card:hover {
            background: #11243f;
            border-color: #7c3aed;
        }
        .dark .seo-block { background: #13223a; }
        .dark .trust-section { background: #13223a; }
        .dark .demo-result .result-label { color: #86efac; }
        .dark .formula-box {
            background: #0e2747;
            border-color: #1e1b4b;
        }
        .dark .subcat-heading { color: #e2e8f0; }
        *, *::before, *::after { box-sizing: border-box; margin: 0; padding: 0; }
        html { scroll-behavior: smooth; font-size: 16px; -webkit-font-smoothing: antialiased; -moz-osx-font-smoothing: grayscale; }
        body {
            font-family: var(--font-sans);
            background-color: var(--bg);
            color: var(--text);
            line-height: 1.6;
            min-height: 100vh;
            transition: background-color var(--transition), color var(--transition);
        }
        body.search-open { overflow: hidden; }
        body.drawer-open { overflow: hidden; }
        .svg-icon {
            display: block; flex-shrink: 0;
            stroke: currentColor; fill: none; stroke-width: 2;
            stroke-linecap: round; stroke-linejoin: round;
            width: 1em; height: 1em; vertical-align: middle;
        }
        .breadcrumb-nav {
            max-width: var(--max-width); margin: 0 auto; padding: 14px 20px 0;
            font-size: 0.82rem; color: var(--text-muted);
            display: flex; flex-wrap: wrap; align-items: center; gap: 5px;
        }
        .breadcrumb-nav a { color: var(--text-secondary); text-decoration: none; font-weight: 500; transition: color var(--transition); }
        .breadcrumb-nav a:hover { color: var(--primary); text-decoration: underline; }
        .breadcrumb-sep { color: var(--text-muted); user-select: none; }
        .breadcrumb-current { color: var(--text); font-weight: 600; }
        .site-header {
            position: sticky; top: 0; z-index: 100;
            background: var(--card-bg); border-bottom: 1px solid var(--border);
            height: var(--header-height); display: flex; align-items: center;
            transition: background-color var(--transition), border-color var(--transition), box-shadow var(--transition);
            box-shadow: var(--shadow-sm);
        }
        .header-inner {
            width: 100%; max-width: var(--max-width); margin: 0 auto;
            padding: 0 20px; display: flex; align-items: center; justify-content: space-between; gap: 16px;
        }
        .logo { display: flex; align-items: center; gap: 10px; text-decoration: none; flex-shrink: 0; }
        .site-logo {
            content: url('https://numbrwiz.com/logo-light.svg');
            height: 48px; width: auto; display: block;
        }
        .dark .site-logo { content: url('https://numbrwiz.com/logo-dark.svg'); }
        .header-nav-desktop { display: flex; align-items: center; gap: 4px; flex-shrink: 0; }
        .header-nav-desktop a {
            display: inline-flex; align-items: center;
            padding: 8px 14px; border-radius: 8px;
            font-size: 0.88rem; font-weight: 500; color: var(--text-secondary);
            text-decoration: none; transition: all var(--transition);
            letter-spacing: -0.01em; white-space: nowrap;
        }
        .header-nav-desktop a:hover { color: var(--primary); background: var(--primary-50); }
        .header-nav-desktop a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
        .header-actions { display: flex; align-items: center; gap: 6px; flex-shrink: 0; }
        .icon-btn {
            width: 38px; height: 38px; border-radius: 50%;
            border: 1.5px solid var(--border); background: var(--card-bg);
            cursor: pointer; display: flex; align-items: center; justify-content: center;
            transition: all var(--transition); color: var(--text); flex-shrink: 0;
            line-height: 1; padding: 0;
        }
        .icon-btn:hover { border-color: var(--primary); background: var(--primary-50); }
        .icon-btn:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
        .dark .icon-btn:hover { background: #1e1b4b; border-color: #7c3aed; }
        .icon-btn .svg-icon { width: 1.15rem; height: 1.15rem; }
        .hamburger-btn { display: none; }
        .mobile-drawer-overlay {
            position: fixed; inset: 0; z-index: 150; background: rgba(0, 0, 0, 0.5);
            opacity: 0; pointer-events: none; transition: opacity 0.3s ease;
        }
        .mobile-drawer-overlay.active { opacity: 1; pointer-events: auto; }
        .mobile-drawer {
            position: fixed; top: 0; right: 0; z-index: 151;
            width: 280px; max-width: 80vw; height: 100vh; height: 100dvh;
            background: var(--card-bg); box-shadow: var(--shadow-lg);
            transform: translateX(100%); transition: transform 0.3s cubic-bezier(0.4, 0, 0.2, 1);
            display: flex; flex-direction: column; padding: 20px 18px; gap: 4px;
        }
        .mobile-drawer.active { transform: translateX(0); }
        .mobile-drawer-close {
            align-self: flex-end; width: 36px; height: 36px; border-radius: 50%;
            border: 1.5px solid var(--border); background: var(--card-bg);
            cursor: pointer; display: flex; align-items: center; justify-content: center;
            color: var(--text); transition: all var(--transition); margin-bottom: 8px;
        }
        .mobile-drawer-close:hover { border-color: #ef4444; color: #b91c1c; }
        .mobile-drawer a {
            display: flex; align-items: center; padding: 12px 14px; border-radius: var(--radius);
            font-size: 0.95rem; font-weight: 500; color: var(--text);
            text-decoration: none; transition: all var(--transition); letter-spacing: -0.01em;
        }
        .mobile-drawer a:hover { background: var(--primary-50); color: var(--primary); }
        .mobile-drawer a:focus-visible { outline: 2px solid var(--primary); outline-offset: 2px; }
        .mobile-drawer-sep { height: 1px; background: var(--border); margin: 6px 0; }
        .mobile-drawer .drawer-theme-row {
            display: flex; align-items: center; justify-content: space-between;
            padding: 12px 14px; font-size: 0.88rem; font-weight: 500;
            color: var(--text-secondary); margin-top: auto;
        }
        .search-overlay {
            position: fixed; inset: 0; z-index: 200; background: rgba(0, 0, 0, 0.55);
            display: flex; align-items: flex-start; justify-content: center;
            padding: 70px 20px 40px; opacity: 0; pointer-events: none; transition: opacity 0.2s ease;
        }
        .search-overlay.active { opacity: 1; pointer-events: auto; }
        .search-modal {
            width: 100%; max-width: 600px; background: var(--card-bg);
            border-radius: var(--radius-xl); border: 1px solid var(--border);
            box-shadow: var(--shadow-lg); overflow: hidden;
            display: flex; flex-direction: column; max-height: 65vh;
        }
        .search-modal-header {
            display: flex; align-items: center; gap: 10px;
            padding: 14px 18px; border-bottom: 1px solid var(--border);
            flex-shrink: 0;
        }
        .search-modal-header .svg-icon { width: 1.15rem; height: 1.15rem; color: var(--text-muted); flex-shrink: 0; }
        .search-modal-input { flex: 1; border: none; padding: 8px 0; font-size: 1.05rem; font-family: var(--font-sans); background: transparent; color: var(--text); outline: none; }
        .search-modal-input::placeholder { color: var(--text-muted); }
        .search-modal-close {
            width: 34px; height: 34px; border-radius: 50%;
            border: 1.5px solid var(--border); background: var(--card-bg);
            cursor: pointer; display: flex; align-items: center; justify-content: center;
            color: var(--text); transition: all var(--transition); flex-shrink: 0;
            line-height: 1; padding: 0;
        }
        .search-modal-close:hover { border-color: #ef4444; color: #b91c1c; background: #fef2f2; }
        .dark .search-modal-close:hover { background: #3b1a1a; }
        .search-results { overflow-y: auto; padding: 6px; flex: 1; display: flex; flex-direction: column; gap: 3px; }
        .search-result-card {
            display: flex; align-items: center; gap: 10px; padding: 10px 12px;
            border-radius: var(--radius); cursor: pointer; text-decoration: none;
            color: var(--text); border: 1px solid transparent;
            background: var(--card-bg); transition: all var(--transition);
        }
        .search-result-card:hover { background: var(--primary-50); border-color: var(--primary-light); }
        .search-result-icon {
            width: 36px; height: 36px; border-radius: var(--radius-sm);
            background: var(--primary-50); display: flex; align-items: center; justify-content: center;
            flex-shrink: 0;
        }
        .search-result-icon .svg-icon { width: 1.05rem; height: 1.05rem; color: var(--primary); }
        .search-result-info h4 { font-size: 0.88rem; font-weight: 600; letter-spacing: -0.01em; }
        .search-result-info span { font-size: 0.73rem; color: var(--text-muted); }
        .search-no-results { text-align: center; padding: 28px 16px; color: var(--text-muted); font-size: 0.88rem; }
        .search-hint { text-align: center; padding: 24px 16px; color: var(--text-muted); font-size: 0.83rem; }
        .main-content { max-width: var(--max-width); margin: 0 auto; padding: 0 20px; }
        .section { padding: 36px 0; }
        .section-header { text-align: center; margin-bottom: 28px; }
        .section-header h2 { font-size: 1.7rem; font-weight: 700; letter-spacing: -0.02em; color: var(--secondary); margin-bottom: 6px; }
        .dark .section-header h2 { color: #f1f5f9; }
        .section-header p { color: var(--text-secondary); font-size: 1rem; max-width: 560px; margin: 0 auto; }
        .hero { text-align: center; padding: 40px 0 32px; }
        .hero h1 { font-size: clamp(1.7rem, 3.2vw, 2.4rem); font-weight: 800; letter-spacing: -0.03em; color: var(--secondary); line-height: 1.2; margin-bottom: 10px; max-width: 700px; margin-left: auto; margin-right: auto; }
        .dark .hero h1 { color: #f8fafc; }
        .hero .hero-sub { font-size: 1.05rem; color: var(--text-secondary); max-width: 600px; margin: 0 auto 24px; line-height: 1.5; }
        .hero-stats { display: flex; flex-wrap: wrap; gap: 16px; justify-content: center; margin-bottom: 20px; }
        .hero-stat {
            background: var(--card-bg); border: 1px solid var(--border-light);
            border-radius: var(--radius-lg); padding: 14px 18px; text-align: center;
            min-width: 100px; box-shadow: var(--shadow-sm); transition: all var(--transition);
        }
        .hero-stat .stat-num { font-size: 1.6rem; font-weight: 800; color: var(--primary); letter-spacing: -0.02em; }
        .hero-stat .stat-label { font-size: 0.76rem; color: var(--text-muted); font-weight: 500; }
        .trust-badges { display: flex; flex-wrap: wrap; gap: 12px; justify-content: center; }
        .trust-badge {
            display: flex; align-items: center; gap: 7px; font-size: 0.83rem;
            color: var(--text-secondary); font-weight: 500;
            background: var(--card-bg); padding: 7px 14px; border-radius: 999px;
            border: 1px solid var(--border-light); box-shadow: var(--shadow-sm); transition: all var(--transition);
        }
        .trust-badge-icon {
            width: 26px; height: 26px; border-radius: 50%; background: var(--primary-light);
            display: flex; align-items: center; justify-content: center; flex-shrink: 0;
        }
        .trust-badge-icon .svg-icon { width: 0.8rem; height: 0.8rem; color: var(--primary); }
        .ad-container {
            width: 100%; background: var(--ad-subtle-bg); border: 1px dashed var(--ad-subtle-border);
            border-radius: var(--radius); display: flex; align-items: center; justify-content: center;
            min-height: 60px; padding: 14px 16px; margin: 12px 0; transition: all var(--transition);
            color: var(--text-muted); font-size: 0.68rem; letter-spacing: 0.05em;
            text-transform: uppercase; text-align: center; opacity: 0.7;
        }
        .ad-container:empty { display: none !important; }
        .ad-container.ad-leaderboard { min-height: 70px; max-height: 100px; }
        .ad-container.ad-inline { min-height: 70px; max-height: 110px; margin: 18px 0; }
        @media (min-width: 769px) {
            .ad-container.ad-leaderboard { min-height: 80px; max-height: 110px; }
        }
        @media (max-width: 480px) {
            .ad-container.ad-leaderboard { min-height: 55px; max-height: 80px; }
            .ad-container { padding: 10px 12px; font-size: 0.62rem; }
        }
        .subcat-heading {
            font-size: 1.2rem; font-weight: 700; letter-spacing: -0.02em; color: var(--secondary);
            margin: 32px 0 18px; padding-left: 4px; border-left: 4px solid var(--primary);
            padding: 6px 0 6px 14px;
        }
        .dark .subcat-heading { color: #f1f5f9; }
        .cards-grid {
            display: grid; grid-template-columns: repeat(auto-fill, minmax(240px, 1fr)); gap: 14px;
        }
        .calc-card {
            background: var(--card-bg); border: 1px solid var(--border-light);
            border-radius: var(--radius-lg); padding: 18px; cursor: pointer;
            transition: all var(--transition); text-decoration: none; color: inherit;
            display: flex; align-items: flex-start; gap: 12px;
            box-shadow: var(--shadow-sm); position: relative;
        }
        .calc-card:hover { box-shadow: var(--shadow-lg); border-color: var(--primary); transform: translateY(-2px); }
        .calc-card-icon {
            width: 40px; height: 40px; border-radius: var(--radius); background: var(--primary-50);
            display: flex; align-items: center; justify-content: center; flex-shrink: 0; transition: all var(--transition);
        }
        .calc-card-icon .svg-icon { width: 1.2rem; height: 1.2rem; color: var(--primary); }
        .calc-card:hover .calc-card-icon { background: var(--primary-light); transform: scale(1.04); }
        .calc-card-info h3 { font-size: 0.92rem; font-weight: 600; letter-spacing: -0.01em; margin-bottom: 2px; color: var(--secondary); }
        .dark .calc-card-info h3 { color: #f1f5f9; }
        .calc-card-info p { font-size: 0.78rem; color: var(--text-muted); line-height: 1.4; margin: 0; }
        .featured-calc {
            background: var(--primary-50); border-radius: var(--radius-xl); padding: 28px 24px;
            display: flex; flex-wrap: wrap; gap: 24px; align-items: flex-start;
            border: 1.5px solid var(--primary-light); box-shadow: var(--shadow-md); transition: all var(--transition);
        }
        .featured-calc-info { flex: 1; min-width: 220px; }
        .featured-calc-info .badge {
            display: inline-block; background: var(--nw-solid-primary); color: #fff;
            font-size: 0.72rem; font-weight: 700; padding: 3px 10px; border-radius: 999px;
            margin-bottom: 8px; letter-spacing: 0.02em;
        }
        .featured-calc-info h3 { font-size: 1.35rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 5px; color: var(--secondary); }
        .dark .featured-calc-info h3 { color: #f8fafc; }
        .featured-calc-info p { color: var(--text-secondary); font-size: 0.9rem; margin-bottom: 14px; line-height: 1.5; }
        .featured-calc-demo {
            flex: 1; min-width: 260px; background: var(--card-bg); border-radius: var(--radius-lg);
            padding: 18px 20px; box-shadow: var(--shadow-md); border: 1px solid var(--border);
            display: flex; flex-direction: column; gap: 10px;
        }
        .featured-calc-demo label { font-weight: 600; font-size: 0.82rem; color: var(--text-secondary); letter-spacing: -0.01em; }
        .featured-calc-demo input, .featured-calc-demo select {
            padding: 9px 12px; border: 1.5px solid var(--border); border-radius: var(--radius-sm);
            font-size: 0.95rem; font-family: var(--font-sans); transition: all var(--transition);
            width: 100%; background: var(--bg); color: var(--text);
        }
        .featured-calc-demo input:focus, .featured-calc-demo select:focus {
            outline: none; border-color: var(--primary); box-shadow: 0 0 0 3px rgba(124, 58, 237, 0.08);
        }
        .demo-input-row { display: flex; gap: 10px; flex-wrap: wrap; }
        .demo-input-row>div { flex: 1; min-width: 90px; }
        .demo-result {
            background: #f0fdf4; border: 1px solid #bbf7d0; border-radius: var(--radius-sm);
            padding: 12px 14px; font-weight: 700; font-size: 1rem; color: #166534;
            text-align: center; min-height: 42px; display: flex; align-items: center;
            justify-content: center; transition: all 0.3s ease; flex-direction: column; gap: 3px;
        }
        .demo-result .result-label { font-size: 0.73rem; font-weight: 500; color: #166534; opacity: 0.7; }
        .skeleton-loader { background: var(--bg); border: 1px solid var(--border); border-radius: var(--radius-sm); padding: 14px 16px; min-height: 42px; display: flex; align-items: center; justify-content: center; gap: 10px; transition: all 0.25s ease; }
        .skeleton-spinner { width: 20px; height: 20px; border: 2.5px solid var(--border); border-top-color: var(--primary); border-radius: 50%; animation: spin 0.7s linear infinite; }
        @keyframes spin { to { transform: rotate(360deg); } }
        .skeleton-pulse { width: 55%; height: 10px; background: var(--border); border-radius: 5px; animation: pulse 1.5s ease-in-out infinite; }
        @keyframes pulse { 0%, 100% { opacity: 0.35; } 50% { opacity: 0.75; } }
        .result-fade-in { animation: fadeSlideIn 0.35s ease-out; }
        @keyframes fadeSlideIn { from { opacity: 0; transform: translateY(6px); } to { opacity: 1; transform: translateY(0); } }
        .formula-box {
            background: var(--primary-50); border: 1.5px solid var(--primary-light);
            border-radius: var(--radius-lg); padding: 20px 22px; margin: 20px 0;
            font-family: var(--font-sans); box-shadow: var(--shadow-sm); transition: all var(--transition);
        }
        .dark .formula-box { background: #0e2747; border-color: #1e1b4b; }
        .formula-box h4 { font-weight: 700; font-size: 0.95rem; color: var(--primary); margin-bottom: 8px; letter-spacing: -0.01em; display: flex; align-items: center; gap: 6px; }
        .formula-box code {
            display: block; background: var(--card-bg); padding: 12px 16px; border-radius: var(--radius-sm);
            font-size: 0.9rem; color: var(--secondary); border: 1px solid var(--border);
            overflow-x: auto; white-space: pre-wrap; line-height: 1.7;
            font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
        }
        .dark .formula-box code { color: #e2e8f0; background: #0b1526; }
        .formula-box p { font-size: 0.84rem; color: var(--text-secondary); margin-top: 6px; line-height: 1.5; }
        .related-mini-grid {
            display: grid; grid-template-columns: repeat(auto-fill, minmax(180px, 1fr)); gap: 10px;
            margin-top: 24px;
        }
        .related-mini-card {
            background: var(--card-bg); border: 1px solid var(--border-light);
            border-radius: var(--radius); padding: 14px 16px; text-decoration: none;
            color: inherit; display: flex; align-items: center; gap: 10px;
            transition: all var(--transition); box-shadow: var(--shadow-sm);
        }
        .related-mini-card:hover { border-color: var(--primary); box-shadow: var(--shadow-md); transform: translateY(-1px); }
        .related-mini-icon { display: flex; align-items: center; justify-content: center; flex-shrink: 0; }
        .related-mini-icon .svg-icon { width: 1.2rem; height: 1.2rem; color: var(--primary); }
        .related-mini-card span { font-weight: 500; font-size: 0.85rem; letter-spacing: -0.01em; }
        .seo-block {
            background: var(--card-bg); border-radius: var(--radius-xl); padding: 28px 24px;
            border: 1px solid var(--border); box-shadow: var(--shadow-sm);
        }
        .seo-block h2 { font-size: 1.4rem; font-weight: 700; margin-bottom: 14px; letter-spacing: -0.02em; color: var(--secondary); }
        .dark .seo-block h2 { color: #f8fafc; }
        .seo-block h3 { font-size: 1.1rem; font-weight: 600; margin: 18px 0 6px; letter-spacing: -0.01em; color: var(--secondary); }
        .dark .seo-block h3 { color: #f1f5f9; }
        .seo-block p, .seo-block li { color: var(--text-secondary); font-size: 0.92rem; line-height: 1.65; }
        .seo-block ul { list-style: disc; padding-left: 18px; margin: 6px 0 14px; }
        .seo-block ul li { margin-bottom: 3px; }
        .trust-section {
            background: var(--card-bg); border-radius: var(--radius-xl); padding: 24px 22px;
            border: 1px solid var(--border); box-shadow: var(--shadow-sm); margin-bottom: 20px;
        }
        .trust-section h3 { font-size: 1.15rem; font-weight: 700; letter-spacing: -0.02em; margin-bottom: 10px; color: var(--secondary); }
        .dark .trust-section h3 { color: #f1f5f9; }
        .trust-section p { color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; margin-bottom: 6px; }
        .trust-section ul { list-style: disc; padding-left: 18px; margin: 6px 0; color: var(--text-secondary); font-size: 0.9rem; line-height: 1.6; }
        .faq-list { display: flex; flex-direction: column; gap: 8px; max-width: 720px; margin: 24px auto 0; }
        .faq-item { background: var(--card-bg); border: 1px solid var(--border); border-radius: var(--radius-lg); overflow: hidden; transition: all var(--transition); box-shadow: var(--shadow-sm); }
        .faq-question {
            width: 100%; background: none; border: none; padding: 16px 18px;
            font-size: 0.95rem; font-weight: 600; cursor: pointer; text-align: left;
            display: flex; justify-content: space-between; align-items: center;
            color: var(--secondary); font-family: var(--font-sans);
            letter-spacing: -0.01em; gap: 10px; transition: color var(--transition);
        }
        .dark .faq-question { color: #f1f5f9; }
        .faq-question:hover { color: var(--primary); }
        .faq-arrow { flex-shrink: 0; transition: transform var(--transition); display: flex; align-items: center; justify-content: center; color: var(--text-muted); }
        .faq-arrow .svg-icon { width: 0.75rem; height: 0.75rem; }
        .faq-item.open .faq-arrow { transform: rotate(180deg); color: var(--primary); }
        .faq-answer { max-height: 0; overflow: hidden; transition: max-height 0.35s ease, padding 0.35s ease; padding: 0 18px; font-size: 0.87rem; color: var(--text-secondary); line-height: 1.6; }
        .faq-item.open .faq-answer { max-height: 260px; padding: 0 18px 16px; }
        .last-updated { text-align: center; font-size: 0.75rem; color: var(--text-muted); padding: 6px 0; letter-spacing: 0.02em; }
        .badge-row { display: flex; flex-wrap: wrap; gap: 7px; justify-content: center; margin-top: 6px; }
        .tag-badge {
            display: inline-flex; align-items: center; gap: 4px; padding: 5px 12px; border-radius: 999px;
            font-size: 0.78rem; font-weight: 500; background: var(--card-bg); border: 1px solid var(--border);
            color: var(--text-secondary); text-decoration: none; transition: all var(--transition); cursor: pointer;
        }
        .tag-badge:hover { border-color: var(--primary); color: var(--primary); background: var(--primary-50); }
        .tag-badge .badge-dot { display: inline-block; width: 6px; height: 6px; border-radius: 50%; flex-shrink: 0; background: #7c3aed; }
        @media (max-width: 1024px) { .header-nav-desktop a { padding: 6px 10px; font-size: 0.82rem; } }
        @media (max-width: 768px) {
            .header-nav-desktop { display: none; }
            .hamburger-btn { display: flex; }
            .section { padding: 28px 0; }
            .hero { padding: 28px 0 24px; }
            .hero h1 { font-size: 1.5rem; }
            .featured-calc { flex-direction: column; padding: 20px 16px; }
            .cards-grid { grid-template-columns: repeat(auto-fill, minmax(150px, 1fr)); gap: 10px; }
            .calc-card { padding: 14px; gap: 10px; }
            .calc-card-icon { width: 34px; height: 34px; }
            .calc-card-icon .svg-icon { width: 1rem; height: 1rem; }
            .calc-card-info h3 { font-size: 0.83rem; }
            .calc-card-info p { font-size: 0.7rem; }
            .related-mini-grid { grid-template-columns: 1fr 1fr; }
            .search-modal { max-height: 75vh; margin: 0 6px; }
            .subcat-heading { font-size: 1.05rem; margin: 24px 0 14px; }
        }
        @media (max-width: 480px) {
            .hero-stats { gap: 8px; }
            .hero-stat { min-width: 70px; padding: 10px 12px; }
            .hero-stat .stat-num { font-size: 1.2rem; }
            .trust-badges { gap: 6px; }
            .trust-badge { font-size: 0.72rem; padding: 5px 10px; }
            .cards-grid { grid-template-columns: 1fr 1fr; gap: 8px; }
            .calc-card { flex-direction: column; align-items: center; text-align: center; padding: 12px 10px; }
            .search-modal { max-height: 80vh; border-radius: var(--radius-lg); }
            .search-modal-header { padding: 10px 12px; }
            .search-results { padding: 4px; }
            .section-header h2 { font-size: 1.4rem; }
            .related-mini-grid { grid-template-columns: 1fr; }
            .formula-box code { font-size: 0.78rem; padding: 10px 12px; }
            .breadcrumb-nav { font-size: 0.74rem; padding: 10px 12px 0; }
        }