* {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        
        :root {
            --bg: #0a0a0a;
            --bg-secondary: #111;
            --text: #e0e0e0;
            --text-dim: #666;
            --accent: #fff;
            --border: #333;
            --key-color: #f97583;
            --string-color: #9ecbff;
            --number-color: #79c0ff;
            --bool-color: #56d4dd;
            --null-color: #888;
            --tag-color: #7ee787;
            --attr-color: #79c0ff;
        }
        
        [data-theme="light"] {
            --bg: #fafafa;
            --bg-secondary: #fff;
            --text: #1a1a1a;
            --text-dim: #999;
            --accent: #000;
            --border: #ddd;
            --key-color: #d73a49;
            --string-color: #032f62;
            --number-color: #005cc5;
            --bool-color: #005cc5;
            --null-color: #6a737d;
            --tag-color: #22863a;
            --attr-color: #6f42c1;
        }
        
        body {
            font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
            background: var(--bg);
            color: var(--text);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            transition: background 0.3s, color 0.3s;
        }
        
        .header {
            position: sticky;
            top: 0;
            z-index: 100;
            display: flex;
            align-items: center;
            gap: 10px;
            padding: 15px 20px;
            border-bottom: 1px solid var(--border);
            flex-wrap: wrap;
            background: var(--bg);
            backdrop-filter: blur(10px);
        }
        
        .url-container {
            flex: 1;
            min-width: 200px;
            position: relative;
            display: flex;
            align-items: center;
        }

        .url-display {
            flex: 1;
            padding: 8px 90px 8px 12px;
            border: 1px solid var(--border);
            border-radius: 6px;
            background: var(--bg-secondary);
            color: var(--text);
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 12px;
            white-space: nowrap;
            overflow: hidden;
            text-overflow: ellipsis;
            cursor: pointer;
            user-select: all;
        }

        .url-copy-btn {
            position: absolute;
            right: 6px;
            padding: 4px 12px;
            border: 1px solid var(--border);
            border-radius: 4px;
            background: var(--bg);
            color: var(--text);
            font-size: 11px;
            cursor: pointer;
            transition: all 0.2s;
            white-space: nowrap;
            user-select: none;
        }

        .url-copy-btn:hover {
            background: var(--accent);
            color: var(--bg);
            border-color: var(--accent);
        }
        
        .btn {
            padding: 8px 16px;
            border: 1px solid var(--border);
            border-radius: 6px;
            background: transparent;
            color: var(--text);
            font-size: 13px;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            align-items: center;
            gap: 5px;
            white-space: nowrap;
        }
        
        .btn:hover {
            background: var(--accent);
            color: var(--bg);
            border-color: var(--accent);
        }
        
        .btn.active {
            background: var(--accent);
            color: var(--bg);
        }
        
        .format-select {
            padding: 8px 12px;
            border: 1px solid var(--border);
            border-radius: 6px;
            background: var(--bg-secondary);
            color: var(--text);
            font-size: 13px;
            cursor: pointer;
            outline: none;
        }
        
        .main {
            flex: 1;
            display: flex;
            overflow: hidden;
        }
        
        .panel {
            flex: 1;
            display: flex;
            flex-direction: column;
            min-width: 0;
            overflow: hidden;
        }
        
        .panel-header {
            padding: 10px 20px;
            font-size: 11px;
            text-transform: uppercase;
            letter-spacing: 1px;
            color: var(--text-dim);
            border-bottom: 1px solid var(--border);
            background: var(--bg-secondary);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }
        
        .panel-actions {
            display: flex;
            gap: 8px;
        }
        
        .panel-btn {
            padding: 4px 10px;
            border: 1px solid var(--border);
            border-radius: 4px;
            background: transparent;
            color: var(--text-dim);
            font-size: 11px;
            cursor: pointer;
            transition: all 0.2s;
        }
        
        .panel-btn:hover {
            color: var(--text);
            border-color: var(--text);
        }
        
        .editor-panel {
            border-right: 1px solid var(--border);
        }
        
        .editor {
            flex: 1;
            width: 100%;
            padding: 20px;
            border: none;
            background: transparent;
            color: var(--text);
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 14px;
            line-height: 1.6;
            resize: none;
            outline: none;
            caret-color: var(--accent);
        }
        
        .editor::placeholder {
            color: var(--text-dim);
        }
        
        .preview {
            flex: 1;
            padding: 20px;
            overflow: auto;
            font-size: 14px;
            line-height: 1.6;
        }
        
        /* Tree View Styles */
        .tree {
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 13px;
            line-height: 1.5;
        }
        
        .tree-item {
            position: relative;
        }
        
        .tree-line {
            display: flex;
            align-items: flex-start;
            padding: 2px 0;
        }
        
        .tree-toggle {
            width: 20px;
            height: 20px;
            display: flex;
            align-items: center;
            justify-content: center;
            cursor: pointer;
            user-select: none;
            color: var(--text-dim);
            flex-shrink: 0;
            font-size: 10px;
            transition: transform 0.15s;
        }
        
        .tree-toggle:hover {
            color: var(--text);
        }
        
        .tree-toggle.collapsed {
            transform: rotate(-90deg);
        }
        
        .tree-toggle.empty {
            visibility: hidden;
        }
        
        .tree-content {
            flex: 1;
            min-width: 0;
        }
        
        .tree-children {
            padding-left: 20px;
            border-left: 1px solid var(--border);
            margin-left: 9px;
        }
        
        .tree-children.collapsed {
            display: none;
        }
        
        .tree-key {
            color: var(--key-color);
        }
        
        .tree-string {
            color: var(--string-color);
        }
        
        .tree-number {
            color: var(--number-color);
        }
        
        .tree-bool {
            color: var(--bool-color);
        }
        
        .tree-null {
            color: var(--null-color);
            font-style: italic;
        }
        
        .tree-bracket {
            color: var(--text-dim);
        }
        
        .tree-comma {
            color: var(--text-dim);
        }
        
        .tree-ellipsis {
            color: var(--text-dim);
            font-style: italic;
            cursor: pointer;
        }
        
        .tree-ellipsis:hover {
            color: var(--text);
        }
        
        /* XML/HTML specific */
        .tree-tag {
            color: var(--tag-color);
        }
        
        .tree-attr-name {
            color: var(--attr-color);
        }
        
        .tree-attr-value {
            color: var(--string-color);
        }
        
        .tree-text {
            color: var(--text);
        }
        
        .tree-comment {
            color: var(--text-dim);
            font-style: italic;
        }
        
        /* Markdown styles */
        .preview.markdown h1, .preview.markdown h2, .preview.markdown h3 {
            margin: 1em 0 0.5em;
            line-height: 1.3;
        }
        .preview.markdown h1 { font-size: 1.8em; border-bottom: 1px solid var(--border); padding-bottom: 0.3em; }
        .preview.markdown h2 { font-size: 1.5em; }
        .preview.markdown h3 { font-size: 1.2em; }
        .preview.markdown p { margin: 0.8em 0; }
        .preview.markdown ul, .preview.markdown ol { margin: 0.8em 0; padding-left: 2em; }
        .preview.markdown li { margin: 0.3em 0; }
        .preview.markdown code {
            background: var(--bg);
            padding: 0.2em 0.4em;
            border-radius: 3px;
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 0.9em;
        }
        .preview.markdown pre {
            background: var(--bg);
            padding: 1em;
            border-radius: 6px;
            overflow-x: auto;
            margin: 1em 0;
        }
        .preview.markdown pre code { background: none; padding: 0; }
        .preview.markdown blockquote {
            border-left: 3px solid var(--accent);
            margin: 1em 0;
            padding-left: 1em;
            color: var(--text-dim);
        }
        .preview.markdown a { color: #58a6ff; }
        .preview.markdown table { border-collapse: collapse; margin: 1em 0; width: 100%; }
        .preview.markdown th, .preview.markdown td { border: 1px solid var(--border); padding: 8px 12px; text-align: left; }
        .preview.markdown th { background: var(--bg); }
        .preview.markdown img { max-width: 100%; }
        
        .preview.html-render iframe {
            width: 100%;
            height: 100%;
            border: none;
            background: #fff;
            border-radius: 4px;
        }
        
        .toast {
            position: fixed;
            bottom: 30px;
            left: 50%;
            transform: translateX(-50%) translateY(100px);
            background: var(--accent);
            color: var(--bg);
            padding: 12px 24px;
            border-radius: 6px;
            font-size: 14px;
            opacity: 0;
            transition: all 0.3s ease;
            z-index: 100;
        }
        
        .toast.show {
            transform: translateX(-50%) translateY(0);
            opacity: 1;
        }
        
        .status {
            padding: 8px 20px;
            font-size: 11px;
            color: var(--text-dim);
            border-top: 1px solid var(--border);
            display: flex;
            justify-content: space-between;
        }

        .save-options {
            display: flex;
            align-items: center;
            gap: 10px;
        }

        .toggle {
            display: flex;
            align-items: center;
            gap: 6px;
            cursor: pointer;
            user-select: none;
        }

        .toggle input[type="checkbox"] {
            width: 16px;
            height: 16px;
            cursor: pointer;
        }

        #saveControls {
            display: flex;
            align-items: center;
            gap: 8px;
        }

        /* History Sidebar */
        .history-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.5);
            opacity: 0;
            visibility: hidden;
            z-index: 1000;
            backdrop-filter: blur(5px);
            transition: opacity 0.3s ease, visibility 0.3s ease;
        }

        .history-overlay.show {
            opacity: 1;
            visibility: visible;
        }

        .history-sidebar {
            position: fixed;
            right: -400px;
            top: 0;
            height: 100vh;
            width: 400px;
            background: var(--bg-secondary);
            border-left: 1px solid var(--border);
            display: flex;
            flex-direction: column;
            box-shadow: -5px 0 20px rgba(0, 0, 0, 0.3);
            z-index: 1001;
            transition: right 0.3s ease;
        }

        .history-sidebar.show {
            right: 0;
        }

        .history-header {
            padding: 20px;
            border-bottom: 1px solid var(--border);
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .history-header h2 {
            margin: 0;
            font-size: 18px;
        }

        .history-close {
            padding: 8px 16px;
            border: 1px solid var(--border);
            border-radius: 6px;
            background: transparent;
            color: var(--text);
            cursor: pointer;
            transition: all 0.2s;
        }

        .history-close:hover {
            background: var(--accent);
            color: var(--bg);
            border-color: var(--accent);
        }

        .history-list {
            flex: 1;
            overflow-y: auto;
            padding: 10px;
        }

        .history-item {
            padding: 12px;
            border: 1px solid var(--border);
            border-radius: 6px;
            margin-bottom: 8px;
            cursor: pointer;
            transition: all 0.2s;
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        .history-item:hover {
            background: var(--bg);
            border-color: var(--accent);
        }

        .history-item-info {
            flex: 1;
        }

        .history-item-url {
            font-family: 'SF Mono', 'Fira Code', monospace;
            font-size: 13px;
            color: var(--text);
            margin-bottom: 4px;
        }

        .history-item-meta {
            font-size: 11px;
            color: var(--text-dim);
        }

        .history-item-badge {
            padding: 4px 8px;
            border-radius: 4px;
            font-size: 10px;
            text-transform: uppercase;
            background: var(--bg);
            border: 1px solid var(--border);
        }

        .history-empty {
            padding: 40px;
            text-align: center;
            color: var(--text-dim);
        }

        /* Password Modal */
        .password-overlay {
            position: fixed;
            top: 0;
            left: 0;
            right: 0;
            bottom: 0;
            background: rgba(0, 0, 0, 0.8);
            backdrop-filter: blur(8px);
            display: flex;
            align-items: center;
            justify-content: center;
            z-index: 2000;
            animation: fadeIn 0.3s ease;
        }

        @keyframes fadeIn {
            from { opacity: 0; }
            to { opacity: 1; }
        }

        @keyframes slideUp {
            from {
                opacity: 0;
                transform: translateY(20px) scale(0.95);
            }
            to {
                opacity: 1;
                transform: translateY(0) scale(1);
            }
        }

        .password-modal {
            background: var(--bg-secondary);
            border: 1px solid var(--border);
            border-radius: 16px;
            padding: 40px;
            width: 100%;
            max-width: 420px;
            margin: 20px;
            box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.5);
            animation: slideUp 0.4s ease;
        }

        .password-modal h2 {
            font-size: 24px;
            font-weight: 600;
            margin-bottom: 12px;
            display: flex;
            align-items: center;
            gap: 12px;
        }

        .password-modal h2::before {
            content: '';
            display: inline-block;
            width: 48px;
            height: 48px;
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border-radius: 12px;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='24' height='24' viewBox='0 0 24 24' fill='none' stroke='white' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3E%3Crect x='3' y='11' width='18' height='11' rx='2' ry='2'%3E%3C/rect%3E%3Cpath d='M7 11V7a5 5 0 0 1 10 0v4'%3E%3C/path%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: center;
            background-size: 24px;
        }

        .password-modal p {
            color: var(--text-dim);
            font-size: 14px;
            line-height: 1.6;
            margin-bottom: 28px;
        }

        .password-input-group {
            display: flex;
            flex-direction: column;
            gap: 16px;
        }

        .password-input {
            width: 100%;
            padding: 14px 18px;
            border: 2px solid var(--border);
            border-radius: 10px;
            background: var(--bg);
            color: var(--text);
            font-size: 15px;
            outline: none;
            transition: all 0.2s ease;
        }

        .password-input:focus {
            border-color: #667eea;
            box-shadow: 0 0 0 4px rgba(102, 126, 234, 0.15);
        }

        .password-input::placeholder {
            color: var(--text-dim);
        }

        .password-buttons {
            display: flex;
            gap: 12px;
        }

        .password-btn {
            flex: 1;
            padding: 14px 24px;
            border: 2px solid var(--border);
            border-radius: 10px;
            background: transparent;
            color: var(--text);
            font-size: 14px;
            font-weight: 500;
            cursor: pointer;
            transition: all 0.2s ease;
        }

        .password-btn:hover {
            background: var(--bg);
            border-color: var(--text-dim);
        }

        .password-btn.primary {
            background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
            border: none;
            color: white;
        }

        .password-btn.primary:hover {
            opacity: 0.9;
            transform: translateY(-1px);
            box-shadow: 0 4px 12px rgba(102, 126, 234, 0.4);
        }

        .password-error {
            display: none;
            padding: 12px 16px;
            background: rgba(239, 68, 68, 0.1);
            border: 1px solid rgba(239, 68, 68, 0.3);
            border-radius: 8px;
            color: #ef4444;
            font-size: 13px;
            text-align: center;
            animation: shake 0.4s ease;
        }

        @keyframes shake {
            0%, 100% { transform: translateX(0); }
            20%, 60% { transform: translateX(-5px); }
            40%, 80% { transform: translateX(5px); }
        }

        @media (max-width: 768px) {
            .main { flex-direction: column; }
            .editor-panel { border-right: none; border-bottom: 1px solid var(--border); }
            .panel { flex: none; height: 50vh; }

            .history-sidebar {
                width: 100%;
                right: -100%;
            }

            .history-sidebar.show {
                right: 0;
            }

            .password-modal {
                padding: 30px 24px;
                margin: 16px;
            }

            .password-modal h2 {
                font-size: 20px;
            }

            .password-modal h2::before {
                width: 40px;
                height: 40px;
                background-size: 20px;
            }
        }