/* === VARIABLES (From main.css) === */
        :root{
          --main-color:#1A48EE;
          --secondary-color:#008AFF;
          --tertiary-color:#2c20E6;
          --secondary-background:#f9f9f9;
          --main-background:#e5f3ff;
          --tertiary-background:#e6e5ea;
          --color-white:#ffffff;
          --color-error-dark: #c53030;
          --color-green: #16a34a;
          --color-gray:#4a5568;
          --color-light-gray:#ccc;
          --border-color:#e2e8f0;
        }
        .intro-text {
            color: var(--color-gray);
            text-align: center;
            margin-bottom: 1.5rem;
            line-height: 1.6;
        }
        
        .input-group {
            display: flex;
            flex-direction: column;
            max-width: 400px;
            margin: 0 auto 1.5rem auto;
        }
        
        label {
            font-weight: bold;
            color: #333;
            margin-bottom: 0.5rem;
        }
        
        input[type="number"] {
            padding: 0.75rem;
            border: 1px solid var(--border-color);
            border-radius: 4px;
            font-size: 1rem;
            width: 100%;
            box-sizing: border-box;
        }
        
        /* Controls */
        .controls {
            display: flex;
            gap: 1rem;
            justify-content: center;
            margin-top: 1.5rem;
        }
        
        #clear-btn, #calculate-btn {
            border: none;
            padding: 0.75rem 1.5rem;
            font-size: 1rem;
            font-weight: bold;
            border-radius: 4px;
            cursor: pointer;
            transition: background-color 0.2s;
            color: white;
        }
        
        #clear-btn:focus-visible, #calculate-btn:focus-visible {
            outline: 3px solid var(--secondary-color);
            outline-offset: 2px;
        }

        #calculate-btn { background-color: var(--main-color); }
        #calculate-btn:hover { background-color: var(--secondary-color); }
        
        #clear-btn { background-color: var(--color-error-dark); }
        #clear-btn:hover { background-color: #d32f2f; }
        
        /* Results Area */
        #results-container {
            margin-top: 2rem;
            padding-top: 1.5rem;
            border-top: 1px solid var(--border-color);
            text-align: center;
        }
        
        .result-summary {
            font-size: 1.2rem;
            color: var(--color-gray);
            margin-bottom: 1rem;
        }
        
        .big-result {
            font-size: 2rem;
            font-weight: bold;
            color: var(--main-color);
            margin-bottom: 0.5rem;
            word-wrap: break-word;
        }
        
        .exponent-result {
            font-size: 1.5rem;
            color: #333;
            font-family: monospace;
            background: var(--secondary-background);
            padding: 0.5rem 1rem;
            border-radius: 4px;
            display: inline-block;
        }

        /* Visualization */
        #visualization-container {
            margin-top: 2rem;
            background-color: var(--secondary-background);
            padding: 1.5rem;
            border-radius: 8px;
            border: 1px solid var(--border-color);
            text-align: left;
        }
        
        .step-row {
            display: flex;
            justify-content: space-between;
            padding: 0.5rem 0;
            border-bottom: 1px solid #eee;
            font-family: monospace;
            font-size: 1.1rem;
        }
        .step-row:last-child { border-bottom: none; }
        .step-math { font-weight: bold; color: #333; }
        .step-desc { color: var(--color-gray); font-size: 0.9rem; }

        .error-message {
            color: var(--color-error-dark);
            text-align: center;
            margin-top: 1rem;
            font-weight: bold;
            min-height: 1.2em;
        }

        /* Content Sections */
        .content-section h2 {
            color: var(--main-color);
            border-bottom: 2px solid var(--border-color);
            padding-bottom: 0.5rem;
            margin-top: 0;
        }
        .content-section p, .content-section li {
            color: var(--color-gray);
            line-height: 1.6;
        }
        .example-equation {
            display: block;
            background-color: var(--secondary-background);
            padding: 0.5rem;
            border-radius: 4px;
            font-family: monospace;
            margin-top: 0.5rem;
        }

        @media (max-width: 640px) {
            .controls { flex-direction: column; }
            button { width: 100%; }
            .step-row { flex-direction: column; }
        }

        .hidden { display: none; }
        
        /* FAQ Styles */
        .faq-item { border-bottom: 1px solid var(--border-color); padding-bottom: 1rem; margin-bottom: 1rem; }
        .faq-item:last-child { border: none; }
        .faq-item h3 { color: #1a202c; font-size: 1.1rem; border-left: 4px solid var(--secondary-color); padding-left: 10px; margin-bottom: 0.5rem; }
        
        /* Breadcrumb Styles */
        .breadcrumb ol {
            list-style: none; padding: 0; margin: 0 0 1rem 0; display: flex; flex-wrap: wrap; font-size: 0.9rem; color: var(--color-gray);
        }
        .breadcrumb li { display: flex; align-items: center; }
        .breadcrumb li a { text-decoration: none; color: var(--main-color); }
        .breadcrumb li span { margin: 0 0.5rem; }