.nav-links {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
            list-style: none;
        }
        .nav-links a {
            text-decoration: none;
            color: var(--text-secondary);
            font-weight: 500;
            font-size: 0.84rem;
            padding: 6px 12px;
            border-radius: 999px;
            transition: all var(--transition);
            white-space: nowrap;
            letter-spacing: -0.01em;
        }
        .nav-links a:hover,
        .nav-links a.active {
            color: var(--primary);
            background: var(--primary-50);
        }
        .dark .nav-links a:hover,
        .dark .nav-links a.active {
            background: #173a63;
            color: #6cb2f0;
        }
        .breadcrumb {
            display: flex;
            align-items: center;
            gap: 6px;
            flex-wrap: wrap;
            padding: 14px 0 4px;
            font-size: 0.8rem;
            color: var(--text-muted);
        }
        .breadcrumb a {
            color: var(--text-muted);
            text-decoration: none;
            transition: color var(--transition);
        }
        .breadcrumb a:hover {
            color: var(--primary);
        }
        .breadcrumb .sep {
            color: var(--text-muted);
            font-size: 0.65rem;
        }
        .breadcrumb .current {
            color: var(--text);
            font-weight: 500;
        }
        .hero-meta {
            display: flex;
            flex-wrap: wrap;
            gap: 10px;
            justify-content: center;
            align-items: center;
            margin-bottom: 6px;
        }
        .hero-stat {
            display: flex;
            align-items: center;
            gap: 6px;
            font-weight: 600;
            font-size: 0.85rem;
            color: var(--text-secondary);
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: 999px;
            padding: 7px 14px;
            box-shadow: var(--shadow-sm);
        }
        .hero-stat .svg-icon {
            width: 0.95rem;
            height: 0.95rem;
            color: var(--primary);
        }
        .cat-section-header {
            display: flex;
            align-items: center;
            gap: 10px;
            margin-bottom: 18px;
        }
        .cat-section-header h3 {
            font-size: 1.15rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            color: var(--secondary);
            flex: 1;
        }
        .dark .cat-section-header h3 {
            color: #f1f5f9;
        }
        .cat-section-header .cat-link {
            font-size: 0.82rem;
            font-weight: 600;
            color: var(--primary);
            text-decoration: none;
            white-space: nowrap;
        }
        .cat-section-header .cat-link:hover {
            text-decoration: underline;
        }
        .calc-card-badge {
            display: inline-block;
            font-size: 0.65rem;
            font-weight: 700;
            padding: 2px 8px;
            border-radius: 999px;
            margin-top: 4px;
            letter-spacing: 0.02em;
        }
        .badge-most-used {
            background: #fef3c7;
            color: #92400e;
        }
        .dark .badge-most-used {
            background: #422006;
            color: #fcd34d;
        }
        .badge-trending {
            background: #dcebf8;
            color: #022e56;
        }
        .dark .badge-trending {
            background: #173a63;
            color: #a9d1f5;
        }
        .badge-popular {
            background: #f0fdf4;
            color: #166534;
        }
        .dark .badge-popular {
            background: #052e16;
            color: #bbf7d0;
        }
        .featured-cards-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 16px;
        }
        .featured-calc-card {
            background: var(--card-bg);
            border: 1.5px solid var(--border);
            border-radius: var(--radius-xl);
            padding: 22px 20px;
            text-decoration: none;
            color: inherit;
            transition: all var(--transition);
            box-shadow: var(--shadow-md);
            display: flex;
            flex-direction: column;
            gap: 10px;
            position: relative;
            overflow: hidden;
        }
        .featured-calc-card:hover {
            box-shadow: var(--shadow-lg);
            border-color: var(--primary);
            transform: translateY(-3px);
        }
        .featured-calc-card .fc-top {
            display: flex;
            align-items: flex-start;
            gap: 14px;
        }
        .featured-calc-card .fc-icon {
            width: 48px;
            height: 48px;
            border-radius: var(--radius);
            background: var(--primary-50);
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
            transition: all var(--transition);
        }
        .featured-calc-card:hover .fc-icon {
            background: var(--primary-light);
            transform: scale(1.06);
        }
        .featured-calc-card .fc-icon .svg-icon {
            width: 1.4rem;
            height: 1.4rem;
            color: var(--primary);
        }
        .featured-calc-card h3 {
            font-size: 1.05rem;
            font-weight: 700;
            letter-spacing: -0.02em;
            color: var(--secondary);
        }
        .dark .featured-calc-card h3 {
            color: #f1f5f9;
        }
        .featured-calc-card p {
            font-size: 0.82rem;
            color: var(--text-secondary);
            line-height: 1.5;
            margin: 0;
        }
        .featured-calc-card .fc-tags {
            display: flex;
            gap: 6px;
            flex-wrap: wrap;
        }
        .fc-tag {
            font-size: 0.68rem;
            font-weight: 600;
            padding: 3px 9px;
            border-radius: 999px;
            letter-spacing: 0.02em;
        }
        .fc-tag.most-used {
            background: #fef3c7;
            color: #b45309;
        }
        .dark .fc-tag.most-used {
            background: #422006;
            color: #fcd34d;
        }
        .fc-tag.trending {
            background: #dcebf8;
            color: #022e56;
        }
        .dark .fc-tag.trending {
            background: #173a63;
            color: #a9d1f5;
        }
        .fc-tag.fastest {
            background: #f0fdf4;
            color: #15803d;
        }
        .dark .fc-tag.fastest {
            background: #052e16;
            color: #bbf7d0;
        }
        .trending-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(210px, 1fr));
            gap: 12px;
        }
        .trending-card {
            background: var(--card-bg);
            border: 1px solid var(--border-light);
            border-radius: var(--radius-lg);
            padding: 16px;
            text-decoration: none;
            color: inherit;
            transition: all var(--transition);
            box-shadow: var(--shadow-sm);
            display: flex;
            align-items: center;
            gap: 10px;
            position: relative;
        }
        .trending-card:hover {
            box-shadow: var(--shadow-md);
            transform: translateY(-2px);
            border-color: var(--primary);
        }
        .trending-card .trend-icon {
            display: flex;
            align-items: center;
            justify-content: center;
            flex-shrink: 0;
        }
        .trending-card .trend-icon .svg-icon {
            width: 1.3rem;
            height: 1.3rem;
            color: var(--primary);
        }
        .trending-card .trend-info h4 {
            font-size: 0.85rem;
            font-weight: 600;
            letter-spacing: -0.01em;
            color: var(--secondary);
        }
        .dark .trending-card .trend-info h4 {
            color: #f1f5f9;
        }
        .trending-card .trend-info span {
            font-size: 0.7rem;
            color: var(--text-muted);
        }
        .trending-card .trend-tag {
            position: absolute;
            top: 8px;
            right: 10px;
            font-size: 0.6rem;
            font-weight: 700;
            letter-spacing: 0.04em;
            padding: 2px 7px;
            border-radius: 999px;
            text-transform: uppercase;
        }
        .trend-tag.trending-up {
            background: #dcebf8;
            color: #022e56;
        }
        .dark .trend-tag.trending-up {
            background: #173a63;
            color: #a9d1f5;
        }
        .trend-tag.new {
            background: #fef3c7;
            color: #92400e;
        }
        .dark .trend-tag.new {
            background: #422006;
            color: #fcd34d;
        }
        .trend-tag.editor {
            background: #f0fdf4;
            color: #166534;
        }
        .dark .trend-tag.editor {
            background: #052e16;
            color: #bbf7d0;
        }
        .trend-tag.seasonal {
            background: #fce7f3;
            color: #9d174d;
        }
        .dark .trend-tag.seasonal {
            background: #4a0e2e;
            color: #f9a8d4;
        }
        .formula-box {
            background: var(--primary-50);
            border: 1.5px solid var(--primary-light);
            border-radius: var(--radius-lg);
            padding: 20px 22px;
            margin: 10px 0;
            transition: all var(--transition);
        }
        .formula-box h4 {
            font-size: 0.9rem;
            font-weight: 700;
            letter-spacing: -0.01em;
            color: var(--secondary);
            margin-bottom: 6px;
            display: flex;
            align-items: center;
            gap: 6px;
        }
        .dark .formula-box h4 {
            color: #f1f5f9;
        }
        .formula-box h4 .svg-icon {
            width: 1rem;
            height: 1rem;
            color: var(--primary);
        }
        .formula-box code {
            display: block;
            background: var(--card-bg);
            border: 1px solid var(--border);
            border-radius: var(--radius-sm);
            padding: 10px 14px;
            font-family: 'SF Mono', 'Fira Code', 'Consolas', monospace;
            font-size: 0.85rem;
            color: var(--primary);
            letter-spacing: 0.01em;
            line-height: 1.6;
            white-space: pre-wrap;
            word-break: break-word;
        }
        .dark .formula-box code {
            color: #a9d1f5;
            background: #0e2747;
            border-color: #173a63;
        }
        .formula-box .formula-note {
            font-size: 0.73rem;
            color: var(--text-muted);
            margin-top: 6px;
        }
        .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;
        }
        .ad-container:empty {
            display: none !important;
        }
        @media (max-width: 768px) {
            .nav-links {
                display: none;
            }
            .featured-cards-grid {
                grid-template-columns: 1fr;
            }
            .trending-grid {
                grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
            }
        }
        @media (max-width: 480px) {
            .hero-meta {
                flex-direction: column;
                gap: 6px;
            }
            .featured-cards-grid {
                grid-template-columns: 1fr;
            }
            .trending-grid {
                grid-template-columns: 1fr 1fr;
                gap: 8px;
            }
        }