/* Toolbar */
        .editor-toolbar {
            display: flex;
            gap: 0.5rem;
            padding: 1rem;
            background: var(--dm-card-bg);
            border: 1px solid var(--dm-border);
            border-bottom: none;
            border-radius: 8px 8px 0 0;
            flex-wrap: wrap;
            align-items: center;
        }

        .toolbar-group {
            display: flex;
            gap: 0.25rem;
            padding-right: 0.5rem;
            border-right: 1px solid var(--dm-border);
        }

        .toolbar-group:last-child {
            border-right: none;
        }

        .toolbar-btn {
            padding: 0.5rem;
            border: none;
            background: transparent;
            cursor: pointer;
            border-radius: 4px;
            transition: background 0.2s;
            color: var(--dm-text);
        }

        .toolbar-btn:hover {
            background: var(--dm-hover-bg);
        }

        .toolbar-btn.active {
            background: var(--dm-primary);
            color: var(--dm-white);
        }

        /* Split pane layout */
        .split-pane {
            display: grid;
            grid-template-columns: 1fr 1fr;
            gap: 1rem;
            min-height: 500px;
        }

        .pane {
            border: 1px solid var(--dm-border);
            border-radius: 0 0 8px 8px;
            overflow: hidden;
            display: flex;
            flex-direction: column;
        }

        .pane-header {
            padding: 0.75rem 1rem;
            background: var(--dm-gray-100);
            border-bottom: 1px solid var(--dm-border);
            font-weight: 600;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .pane-content {
            flex: 1;
            padding: 1.5rem;
            overflow-y: auto;
            background: var(--dm-card-bg);
        }

        /* Editor textarea */
        #markdown-input {
            width: 100%;
            height: 100%;
            border: none;
            outline: none;
            resize: none;
            font-family: 'Courier New', monospace;
            font-size: 0.9375rem;
            line-height: 1.6;
            background: transparent;
            color: var(--dm-text);
            padding: 0;
        }

        /* Preview styles */
        #preview-content h1 {
            font-size: 2rem;
            margin: 0 0 1rem;
            border-bottom: 2px solid var(--dm-border);
            padding-bottom: 0.5rem;
        }

        #preview-content h2 {
            font-size: 1.5rem;
            margin: 1.5rem 0 1rem;
        }

        #preview-content h3 {
            font-size: 1.25rem;
            margin: 1.25rem 0 0.75rem;
        }

        #preview-content p {
            margin: 0 0 1rem;
            line-height: 1.7;
        }

        #preview-content ul, #preview-content ol {
            margin: 0 0 1rem;
            padding-left: 2rem;
        }

        #preview-content li {
            margin-bottom: 0.5rem;
        }

        #preview-content code {
            background: var(--dm-gray-100);
            padding: 0.2rem 0.4rem;
            border-radius: 3px;
            font-family: 'Courier New', monospace;
            font-size: 0.875rem;
        }

        #preview-content pre {
            background: var(--dm-gray-900);
            color: var(--dm-gray-100);
            padding: 1rem;
            border-radius: 4px;
            overflow-x: auto;
            margin: 0 0 1rem;
        }

        #preview-content pre code {
            background: transparent;
            padding: 0;
            color: inherit;
        }

        #preview-content blockquote {
            border-left: 4px solid var(--dm-primary);
            padding-left: 1rem;
            margin: 0 0 1rem;
            color: var(--dm-text-muted);
            font-style: italic;
        }

        #preview-content a {
            color: var(--dm-primary);
            text-decoration: none;
        }

        #preview-content a:hover {
            text-decoration: underline;
        }

        #preview-content img {
            max-width: 100%;
            height: auto;
            border-radius: 4px;
            margin: 1rem 0;
        }

        #preview-content table {
            width: 100%;
            border-collapse: collapse;
            margin: 0 0 1rem;
        }

        #preview-content th, #preview-content td {
            border: 1px solid var(--dm-border);
            padding: 0.5rem;
            text-align: left;
        }

        #preview-content th {
            background: var(--dm-gray-100);
            font-weight: 600;
        }

        #preview-content hr {
            border: none;
            border-top: 2px solid var(--dm-border);
            margin: 2rem 0;
        }

        /* Stats */
        .stats-bar {
            display: flex;
            gap: 1.5rem;
            padding: 1rem;
            background: var(--dm-gray-100);
            border-radius: 8px;
            margin-bottom: 2rem;
            font-size: 0.875rem;
            color: var(--dm-text-muted);
        }

        .stat-item {
            display: flex;
            align-items: center;
            gap: 0.5rem;
        }

        .stat-value {
            font-weight: 600;
            color: var(--dm-text);
        }

        /* Responsive */
        @media (max-width: 768px) {
            .split-pane {
                grid-template-columns: 1fr;
            }

            .toolbar-group {
                border-right: none;
            }
        }