.tool-label {
        display: flex;
        align-items: center;
        gap: 8px;
        font-size: 13px;
        font-weight: 600;
        color: var(--text-light);
        text-transform: uppercase;
        letter-spacing: 0.5px;
        margin-bottom: 6px;
    }
    .tool-textarea {
        width: 100%;
        height: 400px;
        padding: 16px;
        border: 1px solid var(--border-light);
        border-radius: 8px;
        font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
        font-size: 13px;
        line-height: 1.6;
        resize: vertical;
        background: var(--bg-light);
        color: var(--text-dark);
        transition: border-color 0.2s;
        box-sizing: border-box;
    }
    .tool-textarea:focus {
        outline: none;
        border-color: var(--primary-light);
        box-shadow: 0 0 0 3px rgba(59, 130, 246, 0.1);
    }
    .btn-tool {
        padding: 8px 16px;
        border: none;
        background: linear-gradient(135deg, #3b82f6, #8b5cf6);
        color: white;
        border-radius: 6px;
        font-size: 13px;
        font-weight: 600;
        cursor: pointer;
        transition: all 0.2s;
        display: inline-flex;
        align-items: center;
        gap: 6px;
    }
    .btn-tool:hover { opacity: 0.9; }
    .btn-tool-outline {
        background: transparent;
        color: var(--primary);
        border: 1px solid var(--border-light);
    }
    .btn-tool-outline:hover { background: var(--bg-light); border-color: var(--primary-light); }
    .btn-copy {
        background: none;
        border: none;
        color: var(--primary-light);
        cursor: pointer;
        font-size: 12px;
        font-weight: 600;
        padding: 0;
    }
    .btn-copy:hover { color: var(--primary); }
    .tool-status {
        padding: 10px 16px;
        border-radius: 6px;
        font-size: 13px;
        margin-bottom: 12px;
        font-weight: 500;
    }
    .tool-status.success { background: #ecfdf5; color: #065f46; border: 1px solid #a7f3d0; }
    .tool-status.error { background: #fef2f2; color: #991b1b; border: 1px solid #fecaca; }
    .tab-toggle {
        display: inline-flex;
        background: var(--bg-light);
        border: 1px solid var(--border-light);
        border-radius: 6px;
        overflow: hidden;
    }
    .tab-btn {
        padding: 5px 12px;
        border: none;
        background: transparent;
        font-size: 12px;
        font-weight: 600;
        cursor: pointer;
        color: var(--text-light);
        transition: all 0.2s;
    }
    .tab-btn.active {
        background: var(--primary-light);
        color: #fff;
    }
    .tab-btn:hover:not(.active) {
        color: var(--text-dark);
    }
    .output-pane {
        width: 100%;
        height: 400px;
        border: 1px solid var(--border-light);
        border-radius: 8px;
        overflow-y: auto;
        box-sizing: border-box;
    }
    .preview-pane {
        padding: 16px;
        background: var(--bg-white);
        color: var(--text-dark);
        font-size: 14px;
        line-height: 1.7;
    }
    .preview-pane h1 { font-size: 28px; font-weight: 700; margin: 0 0 12px; border-bottom: 2px solid var(--border-light); padding-bottom: 8px; }
    .preview-pane h2 { font-size: 24px; font-weight: 700; margin: 16px 0 8px; border-bottom: 1px solid var(--border-light); padding-bottom: 6px; }
    .preview-pane h3 { font-size: 20px; font-weight: 600; margin: 14px 0 6px; }
    .preview-pane h4 { font-size: 17px; font-weight: 600; margin: 12px 0 4px; }
    .preview-pane h5 { font-size: 15px; font-weight: 600; margin: 10px 0 4px; }
    .preview-pane h6 { font-size: 14px; font-weight: 600; margin: 8px 0 4px; color: var(--text-medium); }
    .preview-pane p { margin: 8px 0; }
    .preview-pane strong { font-weight: 700; }
    .preview-pane em { font-style: italic; }
    .preview-pane code { background: var(--bg-light); padding: 2px 6px; border-radius: 4px; font-family: 'SF Mono', 'Fira Code', monospace; font-size: 0.9em; }
    .preview-pane pre { background: #1e293b; color: #e2e8f0; padding: 16px; border-radius: 8px; overflow-x: auto; margin: 12px 0; }
    .preview-pane pre code { background: none; padding: 0; color: inherit; font-size: 13px; }
    .preview-pane a { color: var(--primary); text-decoration: underline; }
    .preview-pane img { max-width: 100%; border-radius: 8px; margin: 8px 0; }
    .preview-pane blockquote { border-left: 4px solid var(--primary-light); margin: 12px 0; padding: 8px 16px; background: var(--bg-light); border-radius: 0 6px 6px 0; color: var(--text-medium); }
    .preview-pane ul, .preview-pane ol { padding-left: 24px; margin: 8px 0; }
    .preview-pane li { margin: 4px 0; }
    .preview-pane hr { border: none; border-top: 2px solid var(--border-light); margin: 16px 0; }
    .code-pane {
        padding: 16px;
        background: var(--bg-light);
        font-family: 'SF Mono', 'Fira Code', 'Cascadia Code', monospace;
        font-size: 13px;
        line-height: 1.6;
        color: var(--text-dark);
        white-space: pre-wrap;
        word-break: break-word;
    }
    @media (max-width: 768px) {
        .md-grid { grid-template-columns: 1fr !important; }
        .tool-textarea, .output-pane { height: 300px; }
    }