html { scroll-behavior: smooth; }
        body {
            background-color: #f8faf7;
            color: #1a202c;
            font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
            font-weight: 500;
            -webkit-tap-highlight-color: transparent;
        }

        #reading-progress {
            position: fixed;
            top: 0;
            left: 0;
            width: 0%;
            height: 4px;
            background: linear-gradient(to right, #6b8f63, #334b31);
            z-index: 9999;
            transition: width 0.1s ease-out;
        }

        /* 文章內容排版優化 */
        .article-content h2 {
            font-size: 1.3rem;
            line-height: 1.75;
            font-weight: 700;
            color: #111827;
            border-left: 4px solid #405d3d;
            padding-left: 0.6rem;
            padding-top: 0.2rem;
            margin-top: 1.75rem;
            margin-bottom: 0.85rem;
        }

        .article-content h3 {
            font-size: 1.1rem;
            line-height: 1.6;
            font-weight: 700;
            color: #1f2937;
            margin-top: 1.35rem;
            margin-bottom: 0.65rem;
        }

        .article-content p {
            margin-bottom: 1.15rem;
            line-height: 1.75;
            font-weight: 500;
            color: #2d3748;
            text-align: justify;
            word-break: break-word;
        }

        .article-content ul, .article-content ol {
            padding-left: 1.25rem;
            margin-bottom: 1.15rem;
            font-weight: 500;
        }
        .article-content ul { list-style-type: disc; }
        .article-content ol { list-style-type: decimal; }

        .article-content img {
            max-width: 100%;
            height: auto;
            border-radius: 0.6rem;
            margin: 1.25rem auto;
            display: block;
            cursor: zoom-in;
            box-shadow: 0 4px 6px -1px rgba(0, 0, 0, 0.05);
            transition: transform 0.2s ease, box-shadow 0.2s ease;
        }

        .article-content img:hover {
            transform: scale(1.01);
            box-shadow: 0 10px 15px -3px rgba(0, 0, 0, 0.1);
        }

        .toc-link.active {
            color: #405d3d;
            font-weight: 700;
            background-color: #f2f7f2;
            border-left: 3px solid #405d3d;
        }

        /* 目錄導覽隱藏原生捲軸 */
        .custom-scroll::-webkit-scrollbar { width: 4px; }
        .custom-scroll::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }
                .custom-scroll::-webkit-scrollbar { width: 4px; }
        .custom-scroll::-webkit-scrollbar-thumb { background: #cbd5e1; border-radius: 4px; }