/* Inline icon system - no external font dependency */
        .ico {
            display: inline-flex;
            align-items: center;
            justify-content: center;
            font-style: normal;
            font-size: 12px;
            line-height: 1;
            font-family: 'JetBrains Mono', monospace;
            font-weight: 500;
        }
        .ico svg { width: 14px; height: 14px; fill: currentColor; flex-shrink: 0; }
        :root {
            --bg-deep: #0d0f12;
            --bg-app: #14161b;
            --bg-panel: #1a1d24;
            --bg-surface: #1f222b;
            --bg-input: #252830;
            --bg-hover: #2a2e38;
            --border-subtle: #2a2d36;
            --border-default: #333641;
            --border-focus: #4a7cff;
            --text-primary: #e8eaf0;
            --text-secondary: #8b90a0;
            --text-muted: #5c6070;
            --accent: #4a7cff;
            --accent-dim: rgba(74, 124, 255, 0.12);
            --accent-glow: rgba(74, 124, 255, 0.25);
            --orange: #e8854a;
            --green: #4acf8a;
            --cyan: #4ac5cf;
            --purple: #9a6aff;
            --radius-sm: 4px;
            --radius-md: 6px;
            --radius-lg: 10px;
            --shadow-popup: 0 8px 32px rgba(0,0,0,0.45), 0 2px 8px rgba(0,0,0,0.3);
            --transition: 150ms cubic-bezier(0.4, 0, 0.2, 1);
        }

        * { margin: 0; padding: 0; box-sizing: border-box; }

        body {
            font-family: 'DM Sans', system-ui, sans-serif;
            background: var(--bg-deep);
            color: var(--text-primary);
            height: 100vh;
            overflow: hidden;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        /* Scrollbar */
        ::-webkit-scrollbar { width: 5px; height: 5px; }
        ::-webkit-scrollbar-track { background: transparent; }
        ::-webkit-scrollbar-thumb { background: #333641; border-radius: 3px; }
        ::-webkit-scrollbar-thumb:hover { background: #444; }

        /* ── Trigger Button ── */
        #open-btn {
            padding: 14px 32px;
            font-size: 14px;
            font-family: 'DM Sans', sans-serif;
            font-weight: 600;
            background: var(--accent);
            color: white;
            border: none;
            border-radius: var(--radius-md);
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 10px;
            letter-spacing: 0.02em;
            transition: all var(--transition);
            box-shadow: 0 0 0 0 var(--accent-glow);
        }
        #open-btn:hover {
            background: #5a8aff;
            box-shadow: 0 0 24px 4px var(--accent-glow);
            transform: translateY(-1px);
        }

        /* ── Modal ── */
        #modal-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.75);
            z-index: 1000;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(6px);
            animation: fadeIn 200ms ease;
        }
        @keyframes fadeIn { from { opacity: 0; } to { opacity: 1; } }

        #modal-window {
            width: 96vw;
            height: 92vh;
            background: var(--bg-app);
            display: flex;
            flex-direction: column;
            border-radius: var(--radius-lg);
            box-shadow: 0 32px 80px rgba(0,0,0,0.6), 0 0 1px rgba(255,255,255,0.08);
            overflow: hidden;
            border: 1px solid var(--border-subtle);
            animation: slideUp 250ms cubic-bezier(0.16, 1, 0.3, 1);
        }
        @keyframes slideUp {
            from { opacity: 0; transform: translateY(12px) scale(0.98); }
            to { opacity: 1; transform: translateY(0) scale(1); }
        }

        /* ── Header ── */
        .modal-header {
            height: 42px;
            background: var(--bg-surface);
            border-bottom: 1px solid var(--border-subtle);
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 0 16px;
            flex-shrink: 0;
        }
        .modal-header .file-label {
            display: flex;
            align-items: center;
            gap: 8px;
            font-size: 13px;
            font-weight: 500;
            color: var(--text-secondary);
        }
        .modal-header .file-label .dot {
            width: 7px; height: 7px;
            background: var(--orange);
            border-radius: 50%;
        }
        .close-btn {
            width: 28px; height: 28px;
            display: flex; align-items: center; justify-content: center;
            border-radius: var(--radius-sm);
            cursor: pointer;
            color: var(--text-muted);
            transition: all var(--transition);
            font-size: 14px;
        }
        .close-btn:hover { background: var(--bg-hover); color: var(--text-primary); }

        /* ── Main Layout ── */
        .editor-container {
            display: flex;
            flex: 1;
            min-height: 0;
        }

        .left-pane {
            width: 55%;
            position: relative;
            border-right: 1px solid var(--border-subtle);
        }
        #ace-editor {
            position: absolute;
            inset: 0;
            font-size: 13px;
            line-height: 1.6;
        }

        .right-pane {
            width: 45%;
            display: flex;
            flex-direction: column;
            background: var(--bg-panel);
            min-height: 0;
        }

        /* ── Element Tree / Navigator ── */
        .element-tree-section {
            height: 180px;
            min-height: 120px;
            border-bottom: 1px solid var(--border-subtle);
            display: flex;
            flex-direction: column;
            flex-shrink: 0;
        }
        .tree-header {
            padding: 10px 14px;
            font-size: 10px;
            font-weight: 700;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.1em;
            background: var(--bg-surface);
            border-bottom: 1px solid var(--border-subtle);
            flex-shrink: 0;
        }
        .tree-content {
            overflow-y: auto;
            padding: 4px 0;
            flex: 1;
        }
        .tree-item {
            padding: 6px 14px;
            font-family: 'JetBrains Mono', monospace;
            font-size: 12px;
            color: var(--text-secondary);
            cursor: pointer;
            display: flex;
            align-items: center;
            gap: 8px;
            border-left: 2px solid transparent;
            transition: all var(--transition);
            user-select: none;
        }
        .tree-item:hover { color: var(--text-primary); background: rgba(255,255,255,0.03); }
        .tree-item.active {
            background: var(--accent-dim);
            color: var(--accent);
            border-left-color: var(--accent);
        }
        .tree-item .ico { font-size: 10px; width: 14px; text-align: center; flex-shrink: 0; }
        .tree-item .selector-type {
            font-size: 9px;
            color: var(--text-muted);
            background: var(--bg-input);
            padding: 1px 5px;
            border-radius: 3px;
            margin-left: auto;
            font-family: 'JetBrains Mono', monospace;
        }

        /* ── Visual Editor ── */
        .visual-editor {
            flex: 1;
            overflow-y: auto;
            min-height: 0;
        }

        /* Panel Sections */
        .panel-section {
            border-bottom: 1px solid var(--border-subtle);
        }
        .panel-title {
            font-size: 11px;
            font-weight: 700;
            color: var(--text-secondary);
            padding: 10px 14px;
            display: flex;
            justify-content: space-between;
            align-items: center;
            cursor: pointer;
            user-select: none;
            transition: all var(--transition);
            letter-spacing: 0.02em;
        }
        .panel-title:hover { color: var(--text-primary); background: rgba(255,255,255,0.02); }
        .panel-title .chevron {
            font-size: 12px;
            transition: transform 200ms ease;
            color: var(--text-muted);
            display: inline-block;
        }
        .panel-title.collapsed .chevron { transform: rotate(-90deg); }
        .panel-body {
            padding: 4px 14px 14px;
            overflow: hidden;
            transition: max-height 200ms ease, padding 200ms ease, opacity 150ms ease;
        }
        .panel-body.collapsed {
            max-height: 0 !important;
            padding-top: 0;
            padding-bottom: 0;
            opacity: 0;
            pointer-events: none;
        }

        /* Grid */
        .row {
            display: flex;
            gap: 8px;
            margin-bottom: 8px;
            align-items: flex-end;
        }
        .row:last-child { margin-bottom: 0; }
        .col { display: flex; flex-direction: column; flex: 1; min-width: 0; }
        .col-2 { flex: 2; }

        label {
            font-size: 10px;
            font-weight: 500;
            color: var(--text-muted);
            margin-bottom: 4px;
            display: block;
            letter-spacing: 0.03em;
        }

        /* ── Inputs ── */
        input[type="text"], input[type="number"], select {
            background: var(--bg-input);
            border: 1px solid transparent;
            color: var(--text-primary);
            font-size: 12px;
            font-family: 'JetBrains Mono', monospace;
            padding: 6px 8px;
            border-radius: var(--radius-sm);
            width: 100%;
            box-sizing: border-box;
            outline: none;
            transition: all var(--transition);
        }
        input[type="text"]:hover, select:hover { border-color: var(--border-default); }
        input[type="text"]:focus, select:focus {
            border-color: var(--accent);
            background: #282b35;
            box-shadow: 0 0 0 2px var(--accent-dim);
        }
        select {
            cursor: pointer;
            -webkit-appearance: none;
            appearance: none;
            background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='10' height='6'%3E%3Cpath d='M0 0l5 6 5-6z' fill='%235c6070'/%3E%3C/svg%3E");
            background-repeat: no-repeat;
            background-position: right 8px center;
            padding-right: 24px;
        }
        input::-webkit-outer-spin-button, input::-webkit-inner-spin-button { -webkit-appearance: none; }

        /* ── Icon Button Group ── */
        .btn-group {
            display: flex;
            background: var(--bg-input);
            border-radius: var(--radius-sm);
            padding: 2px;
            gap: 2px;
        }
        .icon-btn {
            height:22px;
            flex: 1;
            background: transparent;
            border: none;
            color: var(--text-muted);
            padding: 5px;
            cursor: pointer;
            border-radius: 3px;
            display: flex;
            justify-content: center;
            align-items: center;
            transition: all var(--transition);
        }
        .icon-btn:hover { background: var(--bg-hover); color: var(--text-primary); }
        .icon-btn.active { background: var(--accent); color: white; }
        .icon-btn .ico { font-size: 11px; }
        .icon-btn svg { width: 14px; height: 14px; }

        /* ── Box Model ── */
        .box-model-wrapper {
            margin-top: 4px;
            background: var(--bg-deep);
            border-radius: var(--radius-md);
            padding: 16px;
            border: 1px solid var(--border-subtle);
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .margin-layer {
            position: relative;
            background: rgba(232, 133, 74, 0.06);
            border: 1px dashed rgba(232, 133, 74, 0.25);
            border-radius: var(--radius-sm);
            padding: 28px 44px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .padding-layer {
            position: relative;
            background: rgba(74, 197, 207, 0.06);
            border: 1px solid rgba(74, 197, 207, 0.2);
            border-radius: var(--radius-sm);
            padding: 28px 44px;
            display: flex;
            justify-content: center;
            align-items: center;
        }

        .content-box {
            background: var(--bg-surface);
            border: 1px solid var(--border-default);
            width: 56px;
            height: 28px;
            border-radius: 3px;
            display: flex;
            align-items: center;
            justify-content: center;
            font-size: 8px;
            color: var(--text-muted);
            letter-spacing: 0.05em;
            flex-shrink: 0;
        }

        .box-layer-label {
            position: absolute;
            top: 3px;
            left: 6px;
            font-size: 8px;
            font-weight: 600;
            text-transform: uppercase;
            letter-spacing: 0.06em;
            pointer-events: none;
        }
        .margin-layer > .box-layer-label { color: var(--orange); opacity: 0.5; }
        .padding-layer > .box-layer-label { color: var(--cyan); opacity: 0.5; }

        .spacing-input {
            position: absolute;
            width: 32px !important;
            height: 18px;
            text-align: center;
            background: transparent !important;
            border: 1px solid transparent !important;
            color: var(--text-secondary);
            font-size: 11px;
            font-family: 'JetBrains Mono', monospace;
            cursor: ew-resize;
            border-radius: 3px;
            outline: none;
            transition: all var(--transition);
            padding: 0 !important;
            line-height: 18px;
            box-shadow: none !important;
            z-index: 2;
        }
        .spacing-input:hover { background: rgba(255,255,255,0.08) !important; color: var(--text-primary); border-color: transparent !important; }
        .spacing-input:focus { background: var(--bg-input) !important; border-color: var(--accent) !important; color: var(--accent); box-shadow: 0 0 0 2px var(--accent-dim) !important; }
        .spacing-input.s-top { top: 5px; left: 50%; transform: translateX(-50%); }
        .spacing-input.s-bottom { bottom: 5px; left: 50%; transform: translateX(-50%); }
        .spacing-input.s-left { left: 6px; top: 50%; transform: translateY(-50%); }
        .spacing-input.s-right { right: 6px; top: 50%; transform: translateY(-50%); }

        /* ── Color Picker ── */
        .color-row {
            display: flex;
            align-items: center;
            gap: 8px;
            background: var(--bg-input);
            padding: 3px 4px;
            border-radius: var(--radius-sm);
            border: 1px solid transparent;
            transition: all var(--transition);
        }
        .color-row:focus-within { border-color: var(--accent); box-shadow: 0 0 0 2px var(--accent-dim); }
        .color-swatch {
            width: 22px;
            height: 22px;
            border-radius: 4px;
            border: 1px solid rgba(255,255,255,0.1);
            overflow: hidden;
            position: relative;
            flex-shrink: 0;
            cursor: pointer;
        }
        .color-swatch input[type="color"] {
            position: absolute;
            top: -50%; left: -50%;
            width: 200%; height: 200%;
            cursor: pointer;
            padding: 0; border: none;
        }
        .color-text {
            flex: 1;
            border: none !important;
            background: transparent !important;
            padding: 4px !important;
            font-family: 'JetBrains Mono', monospace;
            box-shadow: none !important;
        }
        .color-text:focus { box-shadow: none !important; }

        /* ── Font Search ── */
        .search-container { position: relative; }
        .search-dropdown {
            position: absolute;
            top: 100%; left: 0; right: 0;
            background: var(--bg-surface);
            border: 1px solid var(--border-default);
            border-radius: 0 0 var(--radius-sm) var(--radius-sm);
            max-height: 160px;
            overflow-y: auto;
            z-index: 50;
            display: none;
            box-shadow: var(--shadow-popup);
        }
        .search-item {
            padding: 7px 10px;
            font-size: 12px;
            cursor: pointer;
            transition: all var(--transition);
        }
        .search-item:hover { background: var(--accent); color: white; }

        /* ── Range Slider ── */
        input[type=range] {
            -webkit-appearance: none;
            background: transparent;
            width: 100%;
            margin: 0;
        }
        input[type=range]::-webkit-slider-runnable-track {
            width: 100%; height: 3px;
            background: var(--border-default);
            border-radius: 2px;
        }
        input[type=range]::-webkit-slider-thumb {
            height: 14px; width: 14px;
            border-radius: 50%;
            background: var(--text-primary);
            -webkit-appearance: none;
            margin-top: -6px;
            cursor: pointer;
            box-shadow: 0 1px 4px rgba(0,0,0,0.4);
            transition: background var(--transition);
        }
        input[type=range]::-webkit-slider-thumb:hover { background: var(--accent); }

        /* ── No Selection State ── */
        #no-selection {
            flex: 1;
            display: flex;
            justify-content: center;
            align-items: center;
            text-align: center;
            padding: 30px;
        }
        .empty-state .ico {
            font-size: 28px;
            color: var(--border-default);
            margin-bottom: 12px;
            display: block;
        }
        .empty-state p {
            font-size: 12px;
            color: var(--text-muted);
            line-height: 1.6;
            max-width: 200px;
        }

        /* ── Transition Builder ── */
        .transition-list {
            display: flex;
            flex-direction: column;
            gap: 6px;
            margin-bottom: 8px;
        }
        .transition-item {
            background: var(--bg-deep);
            border: 1px solid var(--border-subtle);
            border-radius: var(--radius-md);
            padding: 10px 10px 10px 10px;
            position: relative;
        }
        .transition-item-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 8px;
        }
        .transition-item-header .trans-label {
            font-size: 11px;
            font-weight: 600;
            color: var(--accent);
        }
        .transition-item-header .trans-remove {
            background: none;
            border: none;
            color: var(--text-muted);
            cursor: pointer;
            font-size: 12px;
            padding: 2px 4px;
            border-radius: 3px;
            transition: all var(--transition);
            font-family: inherit;
        }
        .transition-item-header .trans-remove:hover { color: #ff6b6b; background: rgba(255,107,107,0.1); }

        .transition-item .row { margin-bottom: 6px; }
        .transition-item .row:last-child { margin-bottom: 0; }

        /* Property dropdown with categories */
        .prop-dropdown-wrapper { position: relative; }
        .prop-dropdown-trigger {
            width: 100%;
            background: var(--bg-input);
            border: 1px solid transparent;
            color: var(--text-primary);
            font-size: 12px;
            font-family: 'JetBrains Mono', monospace;
            padding: 6px 28px 6px 8px;
            border-radius: var(--radius-sm);
            cursor: pointer;
            text-align: left;
            transition: all var(--transition);
            display: flex;
            align-items: center;
            justify-content: space-between;
            box-sizing: border-box;
        }
        .prop-dropdown-trigger:hover { border-color: var(--border-default); }
        .prop-dropdown-trigger:focus { border-color: var(--accent); outline: none; box-shadow: 0 0 0 2px var(--accent-dim); }
        .prop-dropdown-trigger::after {
            content: '▾';
            font-size: 10px;
            color: var(--text-muted);
            position: absolute;
            right: 8px;
        }

        .prop-dropdown-menu {
            display: none;
            position: absolute;
            top: 100%;
            left: 0;
            right: 0;
            background: var(--bg-surface);
            border: 1px solid var(--border-default);
            border-radius: 0 0 var(--radius-sm) var(--radius-sm);
            max-height: 240px;
            overflow-y: auto;
            z-index: 100;
            box-shadow: 0 8px 24px rgba(0,0,0,0.4);
        }
        .prop-dropdown-menu.open { display: block; }

        .prop-dropdown-category {
            padding: 6px 10px 3px;
            font-size: 9px;
            font-weight: 700;
            color: var(--accent);
            text-transform: uppercase;
            letter-spacing: 0.08em;
            background: rgba(74, 124, 255, 0.04);
            border-top: 1px solid var(--border-subtle);
            position: sticky;
            top: 0;
        }
        .prop-dropdown-category:first-child { border-top: none; }

        .prop-dropdown-item {
            padding: 5px 10px 5px 18px;
            font-size: 12px;
            cursor: pointer;
            color: var(--text-secondary);
            transition: all var(--transition);
        }
        .prop-dropdown-item:hover { background: var(--accent); color: white; }

        /* Duration Slider Row */
        .duration-row {
            display: flex;
            align-items: center;
            gap: 8px;
        }
        .duration-row input[type="range"] { flex: 1; }
        .duration-row .dur-value {
            width: 48px;
            text-align: center;
            font-family: 'JetBrains Mono', monospace;
            font-size: 11px;
            background: var(--bg-input);
            border: 1px solid transparent;
            color: var(--text-primary);
            padding: 4px 2px;
            border-radius: var(--radius-sm);
            outline: none;
        }
        .duration-row .dur-value:focus { border-color: var(--accent); }
        .duration-row .dur-unit {
            font-size: 10px;
            color: var(--text-muted);
            width: 20px;
            flex-shrink: 0;
        }

        /* Easing Selector */
        .easing-grid {
            display: none;
            position: absolute;
            bottom: 100%;
            left: 0;
            right: 0;
            background: var(--bg-surface);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-md);
            padding: 10px;
            z-index: 900;
            box-shadow: 0 8px 24px rgba(0,0,0,0.4);
            margin-top: 4px;
        }
        .easing-grid.open { display: block; }
        .easing-grid-title {
            font-size: 10px;
            font-weight: 700;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.06em;
            margin-bottom: 8px;
        }
        .easing-group-label {
            font-size: 9px;
            color: var(--text-muted);
            margin: 6px 0 4px;
            font-weight: 600;
        }
        .easing-options {
            display: grid;
            grid-template-columns: repeat(4, 1fr);
            gap: 4px;
        }
        .easing-option {
            position: relative;
            background: var(--bg-input);
            border: 1px solid transparent;
            border-radius: var(--radius-sm);
            padding: 6px 4px;
            cursor: pointer;
            text-align: center;
            font-size: 10px;
            color: var(--text-secondary);
            transition: all var(--transition);
            display: flex;
            flex-direction: column;
            align-items: center;
            gap: 3px;
        }
        .easing-option:hover { border-color: var(--border-default); color: var(--text-primary); }
        .easing-option.active { border-color: var(--accent); color: var(--accent); background: var(--accent-dim); }
        .easing-option canvas {
            width: 32px;
            height: 24px;
            display: block;
        }

        /* Add transition button */
        .add-transition-btn {
            width: 100%;
            padding: 7px;
            background: var(--bg-input);
            border: 1px dashed var(--border-default);
            border-radius: var(--radius-sm);
            color: var(--text-muted);
            font-size: 11px;
            font-family: 'DM Sans', sans-serif;
            cursor: pointer;
            transition: all var(--transition);
            display: flex;
            align-items: center;
            justify-content: center;
            gap: 6px;
        }
        .add-transition-btn:hover {
            border-color: var(--accent);
            color: var(--accent);
            background: var(--accent-dim);
        }

        /* Manual override input */
        .manual-toggle {
            font-size: 10px;
            color: var(--text-muted);
            cursor: pointer;
            background: none;
            border: none;
            padding: 2px 4px;
            border-radius: 3px;
            font-family: inherit;
            transition: all var(--transition);
        }
        .manual-toggle:hover { color: var(--text-primary); background: var(--bg-hover); }

        /* ── Flex Sub-Panel ── */
        .flex-options {
            display: none;
            padding-top: 8px;
            border-top: 1px dashed var(--border-subtle);
            margin-top: 8px;
        }
        .flex-options.visible { display: block; }

        /* ── Resize Handle (vertical / left-right pane) ── */
        .resize-handle {
            width: 4px;
            cursor: col-resize;
            background: transparent;
            transition: background var(--transition);
            flex-shrink: 0;
        }
        .resize-handle:hover, .resize-handle.dragging { background: var(--accent); }

        /* ── Nav Resize Handle (horizontal / nav height) ── */
        .nav-resize-handle {
            height: 4px;
            cursor: row-resize;
            background: var(--bg-app);
            transition: background var(--transition);
            flex-shrink: 0;
        }
        .nav-resize-handle:hover, .nav-resize-handle.dragging { background: var(--accent); }

        /* Update .tree-header to flexbox */
        .tree-header {
            padding: 6px 10px; /* Reduced padding to fit buttons */
            font-size: 10px;
            font-weight: 700;
            color: var(--text-muted);
            text-transform: uppercase;
            letter-spacing: 0.1em;
            background: var(--bg-surface);
            border-bottom: 1px solid var(--border-subtle);
            flex-shrink: 0;
            /* Flexbox for alignment */
            display: flex;
            justify-content: space-between;
            align-items: center;
        }

        /* Style the new filter dropdown */
        .tree-filter {
            width: auto !important; /* Override global width:100% */
            height: 18px;
            padding: 0 16px 0 6px !important;
            font-size: 9px !important;
            background-color: rgba(0,0,0,0.2) !important;
            border: 1px solid rgba(255,255,255,0.1) !important;
            color: var(--text-secondary) !important;
            border-radius: 3px !important;
            cursor: pointer;
            /* Adjust arrow position for small size */
            background-position: right 4px center !important; 
            background-size: 8px 4px !important;
        }
        .tree-filter:hover {
            border-color: var(--text-muted) !important;
            color: var(--text-primary) !important;
        }
        .tree-filter:focus {
            border-color: var(--accent) !important;
        }

        /* 1. Update tree-header layout */


        /* 2. Container for the buttons */
        .filter-group {
            display: flex;
            gap: 2px;
            background: var(--bg-deep);
            padding: 2px;
            border-radius: 4px;
            border: 1px solid var(--border-subtle);
        }

        /* 3. The Filter Buttons */
        .filter-btn {
            background: transparent;
            border: none;
            color: var(--text-secondary);
            font-family: 'JetBrains Mono', monospace;
            font-size: 9px;
            height: 16px;
            min-width: 16px;
            padding: 0 4px;
            border-radius: 2px;
            cursor: pointer;
            transition: all 0.2s ease;
            display: flex;
            align-items: center;
            justify-content: center;
        }

        .filter-btn:hover {
            color: var(--text-primary);
            background: var(--bg-hover);
        }

        /* Active state for the selected filter */
        .filter-btn.active {
            background: var(--accent);
            color: white;
            font-weight: 700;
        }

        /* ── Unsaved Changes Dialog ── */
        #unsaved-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.65);
            z-index: 2000;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(4px);
            animation: fadeIn 150ms ease;
        }
        #unsaved-overlay.visible { display: flex; }

        #unsaved-dialog {
            background: var(--bg-surface);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-lg);
            padding: 24px 28px;
            width: 320px;
            box-shadow: var(--shadow-popup);
            animation: slideUp 180ms cubic-bezier(0.16, 1, 0.3, 1);
            display: flex;
            flex-direction: column;
            align-items: center;
            text-align: center;
            gap: 10px;
        }
        .unsaved-icon {
            color: #e8a44a;
            margin-bottom: 2px;
        }
        .unsaved-title {
            font-size: 14px;
            font-weight: 700;
            color: var(--text-primary);
        }
        .unsaved-msg {
            font-size: 12px;
            color: var(--text-secondary);
            line-height: 1.6;
            max-width: 240px;
        }
        .unsaved-actions {
            display: flex;
            gap: 8px;
            margin-top: 6px;
            width: 100%;
        }
        .unsaved-actions button {
            flex: 1;
            padding: 8px 12px;
            border-radius: var(--radius-sm);
            font-size: 12px;
            font-family: 'DM Sans', sans-serif;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            border: none;
        }
        #unsaved-cancel-btn {
            background: var(--bg-hover);
            color: var(--text-secondary);
            border: 1px solid var(--border-default) !important;
        }
        #unsaved-cancel-btn:hover {
            background: var(--bg-input);
            color: var(--text-primary);
        }
        #unsaved-discard-btn {
            background: #c0392b;
            color: #fff;
        }
        #unsaved-discard-btn:hover {
            background: #e74c3c;
        }

        /* ── AI Popup ── */
        #ai-popup-overlay {
            display: none;
            position: fixed;
            inset: 0;
            background: rgba(0,0,0,0.6);
            z-index: 3000;
            justify-content: center;
            align-items: center;
            backdrop-filter: blur(4px);
            animation: fadeIn 150ms ease;
        }
        #ai-popup-overlay.visible { display: flex; }

        #ai-popup {
            background: var(--bg-surface);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-lg);
            width: 420px;
            max-width: 90vw;
            box-shadow: var(--shadow-popup);
            animation: slideUp 180ms cubic-bezier(0.16, 1, 0.3, 1);
            display: flex;
            flex-direction: column;
            overflow: hidden;
        }
        .ai-popup-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            padding: 12px 16px;
            background: var(--bg-panel);
            border-bottom: 1px solid var(--border-subtle);
        }
        .ai-popup-header h4 {
            font-size: 13px;
            font-weight: 600;
            color: var(--text-primary);
            margin: 0;
        }
        .ai-popup-close {
            width: 24px; height: 24px;
            display: flex; align-items: center; justify-content: center;
            border-radius: var(--radius-sm);
            cursor: pointer;
            color: var(--text-muted);
            background: none;
            border: none;
            font-size: 14px;
            transition: all var(--transition);
        }
        .ai-popup-close:hover { background: var(--bg-hover); color: var(--text-primary); }

        .ai-popup-body {
            padding: 16px;
            display: flex;
            flex-direction: column;
            gap: 12px;
        }
        .ai-popup-model-row {
            display: flex;
            flex-direction: column;
            gap: 4px;
        }
        .ai-popup-model-row label {
            font-size: 10px;
            font-weight: 600;
            color: var(--text-muted);
            letter-spacing: 0.03em;
            margin: 0;
        }
        .ai-popup-model-readonly {
            width: 100%;
            background: var(--bg-input);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-sm);
            color: var(--orange);
            font-family: 'JetBrains Mono', monospace;
            font-size: 11px;
            padding: 8px 10px;
            outline: none;
        }
        .ai-popup-model-search {
            width: 100%;
            background: var(--bg-input);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-family: 'DM Sans', sans-serif;
            font-size: 12px;
            padding: 8px 10px;
            outline: none;
            transition: border-color var(--transition);
        }
        .ai-popup-model-search:focus {
            border-color: var(--accent);
        }
        .ai-popup-model-select {
            width: 100%;
            max-height: 170px;
            overflow-y: auto;
            background: var(--bg-input);
            border: 1px solid var(--border-default);
            color: var(--orange);
            font-family: 'JetBrains Mono', monospace;
            font-size: 12px;
            border-radius: var(--radius-sm);
            padding: 2px;
        }
        .ai-popup-model-select option {
            padding: 5px 8px;
            cursor: pointer;
        }
        .ai-popup-model-select option:checked {
            background: var(--accent);
            color: #fff;
        }
        .ai-popup-body textarea {
            width: 100%;
            min-height: 80px;
            max-height: 200px;
            background: var(--bg-input);
            border: 1px solid var(--border-default);
            border-radius: var(--radius-sm);
            color: var(--text-primary);
            font-family: 'DM Sans', sans-serif;
            font-size: 12px;
            padding: 10px;
            resize: vertical;
            outline: none;
            transition: border-color var(--transition);
        }
        .ai-popup-body textarea:focus {
            border-color: var(--accent);
        }
        .ai-popup-body textarea::placeholder {
            color: var(--text-muted);
        }
        .ai-popup-status {
            font-size: 11px;
            padding: 6px 10px;
            border-radius: var(--radius-sm);
            display: none;
        }
        .ai-popup-status.visible { display: block; }
        .ai-popup-status.loading { background: rgba(74,124,255,0.1); color: var(--accent); }
        .ai-popup-status.success { background: rgba(74,207,138,0.1); color: var(--green); }
        .ai-popup-status.error { background: rgba(192,57,43,0.1); color: #e74c3c; }

        .ai-popup-footer {
            display: flex;
            justify-content: flex-end;
            gap: 8px;
            padding: 12px 16px;
            border-top: 1px solid var(--border-subtle);
        }
        .ai-popup-btn {
            padding: 7px 16px;
            border-radius: var(--radius-sm);
            font-size: 12px;
            font-family: 'DM Sans', sans-serif;
            font-weight: 600;
            cursor: pointer;
            transition: all var(--transition);
            border: none;
        }
        .ai-popup-btn-cancel {
            background: var(--bg-hover);
            color: var(--text-secondary);
            border: 1px solid var(--border-default) !important;
        }
        .ai-popup-btn-cancel:hover { background: var(--bg-input); color: var(--text-primary); }
        .ai-popup-btn-send {
            background: #9a6aff;
            color: #fff;
        }
        .ai-popup-btn-send:hover:not(:disabled) { background: #b088ff; }
        .ai-popup-btn-send:disabled { background: #3a3a3a; color: #666; opacity: 0.6; cursor: not-allowed; }