/* ===== Percentage Calculator Specific Styles ===== */
        .mode-tabs {
            display: flex;
            gap: 8px;
            margin: 12px 0 24px;
            background: var(--surface);
            padding: 6px;
            border-radius: var(--radius);
            border: 1px solid var(--border);
            flex-wrap: wrap;
        }
        
        .mode-tab {
            flex: 1;
            padding: 10px 16px;
            border: none;
            border-radius: 8px;
            background: transparent;
            font-family: inherit;
            font-weight: 600;
            font-size: 0.8rem;
            color: var(--text-secondary);
            cursor: pointer;
            transition: var(--transition);
            min-width: 120px;
            text-align: center;
        }
        
        .mode-tab:hover {
            color: var(--primary);
        }
        
        .mode-tab.active {
            background: var(--primary);
            color: white;
            box-shadow: 0 4px 12px rgba(37, 99, 235, 0.25);
        }
        
        .mode-content {
            display: none;
        }
        
        .mode-content.active {
            display: block;
            animation: fadeInMode 0.3s ease;
        }
        
        @keyframes fadeInMode {
            from { opacity: 0; transform: translateY(-6px); }
            to { opacity: 1; transform: translateY(0); }
        }
        
        .direction-buttons {
            display: flex;
            gap: 8px;
        }
        
        .direction-btn {
            flex: 1;
            padding: 8px 16px;
            border: 1.5px solid var(--border);
            border-radius: 8px;
            background: var(--bg);
            font-family: inherit;
            font-weight: 600;
            font-size: 0.85rem;
            color: var(--text-secondary);
            cursor: pointer;
            transition: var(--transition);
            text-align: center;
        }
        
        .direction-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
        }
        
        .direction-btn.active {
            background: var(--primary);
            border-color: var(--primary);
            color: white;
        }
        
        .direction-btn.active:hover {
            background: var(--primary);
            color: white;
        }
        
        .result-display {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 24px;
            box-shadow: var(--shadow);
            text-align: center;
        }
        
        .result-main .result-label {
            display: block;
            font-size: 0.7rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--text-muted);
        }
        
        .result-main .result-value {
            display: block;
            font-size: 2.6rem;
            font-weight: 800;
            color: var(--text);
            margin: 4px 0;
            letter-spacing: -0.02em;
        }
        
        .result-formula {
            font-size: 0.85rem;
            color: var(--text-secondary);
            font-family: monospace;
            background: var(--bg);
            padding: 8px 16px;
            border-radius: 6px;
            display: inline-block;
            margin-top: 8px;
        }
        
        .results-grid {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 12px;
            margin-top: 16px;
        }
        
        @media (max-width: 640px) {
            .results-grid {
                grid-template-columns: 1fr;
            }
        }
        
        .result-card {
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            padding: 12px 16px;
        }
        
        .result-card.highlight {
            background: var(--primary);
            border-color: var(--primary);
        }
        
        .result-card.highlight .result-label {
            color: rgba(255, 255, 255, 0.8);
        }
        
        .result-card.highlight .result-value {
            color: white;
        }
        
        .result-card .result-label {
            display: block;
            font-size: 0.65rem;
            font-weight: 500;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--text-muted);
        }
        
        .result-card .result-value {
            display: block;
            font-size: 1rem;
            font-weight: 700;
            color: var(--text);
            margin-top: 2px;
        }
        
        .visualization-container {
            margin-top: 16px;
            padding: 16px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        
        .visualization-bar {
            position: relative;
            height: 32px;
            background: var(--bg);
            border-radius: 16px;
            overflow: hidden;
            border: 1px solid var(--border);
        }
        
        .bar-fill {
            height: 100%;
            background: linear-gradient(90deg, var(--primary), #60a5fa);
            border-radius: 16px;
            transition: width 0.8s cubic-bezier(0.4, 0, 0.2, 1);
            min-width: 0;
        }
        
        .bar-label {
            position: absolute;
            top: 50%;
            left: 50%;
            transform: translate(-50%, -50%);
            font-weight: 700;
            font-size: 0.85rem;
            color: var(--text);
            pointer-events: none;
            white-space: nowrap;
        }
        
        .quick-examples {
            margin-top: 16px;
            padding: 16px;
            background: var(--surface);
            border: 1px solid var(--border);
            border-radius: var(--radius);
            box-shadow: var(--shadow);
        }
        
        .quick-examples h4 {
            font-size: 0.8rem;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.04em;
            color: var(--text-muted);
            margin-bottom: 10px;
        }
        
        .example-buttons {
            display: flex;
            flex-wrap: wrap;
            gap: 8px;
        }
        
        .example-btn {
            padding: 6px 16px;
            border: 1px solid var(--border);
            border-radius: 6px;
            background: var(--bg);
            font-family: inherit;
            font-size: 0.8rem;
            font-weight: 500;
            color: var(--text-secondary);
            cursor: pointer;
            transition: var(--transition);
        }
        
        .example-btn:hover {
            border-color: var(--primary);
            color: var(--primary);
            background: var(--primary-light);
        }

        /* ===== Screenshot Figure ===== */
        .screenshot-figure {
            margin: 20px 0 30px;
        }

        .screenshot-figure img {
            width: 100%;
            max-width: 760px;
            height: auto;
            border: 1px solid var(--border);
            border-radius: 12px;
            box-shadow: 0 4px 16px rgba(0,0,0,0.06);
            display: block;
        }

        .screenshot-figure figcaption {
            font-size: 0.8rem;
            color: var(--text-muted);
            text-align: center;
            margin-top: 8px;
        }

        .highlight-box {
            background: var(--primary-light);
            border-left: 4px solid var(--primary);
            border-radius: 8px;
            padding: 16px 20px;
            margin: 16px 0;
        }

        .highlight-box p {
            margin-bottom: 0;
            font-weight: 500;
            color: var(--text);
        }

        .formula-table {
            width: 100%;
            border-collapse: collapse;
            margin: 12px 0;
            font-size: 0.85rem;
        }

        .formula-table th,
        .formula-table td {
            padding: 10px 14px;
            border: 1px solid var(--border);
            text-align: left;
        }

        .formula-table th {
            background: var(--bg);
            font-weight: 600;
            color: var(--text-secondary);
        }

        .formula-table td {
            color: var(--text-secondary);
        }

        .formula-table code {
            background: var(--bg);
            padding: 2px 8px;
            border-radius: 4px;
            font-family: monospace;
            font-size: 0.85rem;
            color: var(--primary);
        }

        .use-case-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 10px;
            margin: 12px 0;
        }

        .use-case-grid .use-item {
            background: var(--bg);
            border: 1px solid var(--border);
            border-radius: 8px;
            padding: 12px 16px;
            text-align: center;
        }

        .use-case-grid .use-item .icon {
            font-size: 1.5rem;
            display: block;
            margin-bottom: 4px;
        }

        .use-case-grid .use-item strong {
            display: block;
            color: var(--text);
            font-size: 0.9rem;
        }

        .use-case-grid .use-item span {
            font-size: 0.8rem;
            color: var(--text-secondary);
        }