:root {
    --bg-color: #000000;
    --dot-color: rgba(100, 100, 120, 0.2);
    --primary-color: #e0e0f0;
    --accent-color: #00d0ff;
    --accent-color-darker: #008ea8;
    --node-bg-default: rgba(15, 15, 35, 0.85);
    --node-border: var(--accent-color-darker);
    --node-shadow: rgba(0, 208, 255, 0.1);
    --node-hover-shadow: rgba(0, 208, 255, 0.3);
    --node-selected-shadow: rgba(0, 208, 255, 0.5);
    --edge-color: rgba(0, 208, 255, 0.5);
    --edge-highlight-color: #00ffff;
    --delete-button-bg: #d03030;
    --delete-button-text: #ffffff;
    --menu-bg: rgba(20, 20, 40, 0.95);
    --menu-border: var(--accent-color);
    --menu-hover-bg: rgba(0, 208, 255, 0.15);
    --dialog-bg: rgba(25, 25, 50, 0.98);
    --font-family: system-ui, -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, Oxygen, Ubuntu, Cantarell, 'Open Sans', 'Helvetica Neue', sans-serif;
    --font-mono: 'Fira Code', 'Consolas', 'Monaco', monospace;
    --transition-fast: 0.15s ease-out;
    --transition-med: 0.3s ease-out;
    --node-button-bg: rgba(255, 255, 255, 0.1);
    --node-button-hover-bg: rgba(0, 208, 255, 0.3);
}

*, *::before, *::after {
    box-sizing: border-box;
}

body {
    margin: 0;
    overflow: hidden;
    background-color: var(--bg-color);
    color: var(--primary-color);
    font-family: var(--font-family);
    font-size: 14px;
    overscroll-behavior: none;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    background-image: radial-gradient(var(--dot-color) 1px, transparent 1px);
    background-size: 20px 20px;
}

/* Main container for the SpaceGraph instance */
#space { /* Updated from #mindmap-container to match index.html */
    position: fixed;
    inset: 0;
    cursor: grab;
}

#space.panning { /* Class added by CameraController */
    cursor: grabbing;
}

#space.linking { /* Class added by UIManager */
    cursor: crosshair;
}

#webgl-canvas, #css3d-container {
    position: absolute;
    inset: 0;
    width: 100%;
    height: 100%;
    display: block;
}

#webgl-canvas {
    z-index: 1; /* WebGL behind CSS3D */
}

#css3d-container {
    z-index: 2; /* CSS3D objects on top */
    pointer-events: none; /* Allow pointer events to pass through to canvas unless specific elements have pointer-events: auto */
}

/* Styles for HTML-based nodes (HtmlNodeElement, NoteNode) */
.node-html {
    position: absolute; /* Managed by CSS3DRenderer */
    background-color: var(--node-bg, var(--node-bg-default));
    border: 1px solid var(--node-border);
    border-radius: 8px;
    padding: 0; /* Padding handled by inner container */
    color: var(--primary-color);
    pointer-events: auto; /* Nodes themselves are interactive */
    cursor: grab;
    transition: transform var(--transition-fast), box-shadow var(--transition-med), border-color var(--transition-med);
    box-shadow: 0 2px 8px 1px var(--node-shadow);
    min-width: 80px;
    min-height: 40px;
    display: flex;
    flex-direction: column;
    overflow: hidden; /* Important for rounded corners and content clipping */
    backdrop-filter: blur(6px);
    user-select: none; /* Prevent text selection on node drag */
}

.node-html:hover {
    box-shadow: 0 4px 15px 3px var(--node-hover-shadow);
    border-color: var(--accent-color);
    z-index: 10 !important; /* Ensure hovered nodes are visually on top */
}

.node-html.selected {
    box-shadow: 0 0 20px 5px var(--node-selected-shadow);
    border-color: var(--accent-color);
    z-index: 11 !important;
}

.node-html.dragging {
    cursor: grabbing;
    box-shadow: 0 8px 25px 6px var(--node-hover-shadow);
    z-index: 1000 !important; /* Highest z-index while dragging */
    transition: none; /* Disable transition during drag for responsiveness */
}

.node-html.resizing {
    transition: none; /* Disable transition during resize */
}

.node-html.linking-target { /* Highlight for potential link target */
    border-color: #ffaa00;
    box-shadow: 0 0 20px 5px rgba(255, 170, 0, 0.5);
}

.node-inner-wrapper {
    padding: 12px 15px; /* Standardized padding */
    flex-grow: 1;
    display: flex;
    flex-direction: column;
    overflow: hidden;
    position: relative;
}

.node-content {
    flex-grow: 1;
    outline: none;
    overflow-y: auto; /* Allow vertical scrolling within content */
    max-height: 400px; /* Example max height */
    font-size: 1em;
    line-height: 1.45;
    white-space: pre-wrap; /* Preserve whitespace and wrap lines */
    word-wrap: break-word;
    user-select: text; /* Allow text selection inside content area */
    scrollbar-width: thin;
    scrollbar-color: var(--accent-color-darker) transparent;
    transition: transform var(--transition-fast); /* For content zoom */
    transform-origin: top left;
}

.node-content::-webkit-scrollbar { width: 6px; }
.node-content::-webkit-scrollbar-track { background: transparent; }
.node-content::-webkit-scrollbar-thumb { background-color: var(--accent-color-darker); border-radius: 3px; }

.node-content:focus { /* Visual cue when content is focused for editing */
    box-shadow: inset 0 0 0 1px var(--accent-color);
    margin: -1px; /* Prevent layout shift due to box-shadow */
}

/* Rich text styling within node-content */
.node-content > *:first-child { margin-top: 0; }
.node-content > *:last-child { margin-bottom: 0; }
.node-content h1, .node-content h2, .node-content h3 { margin: 0.5em 0; color: var(--accent-color); font-weight: 600; }
.node-content h1 { font-size: 1.3em; }
.node-content h2 { font-size: 1.15em; }
.node-content h3 { font-size: 1.05em; }
.node-content p { margin: 0.5em 0; }
.node-content ul, .node-content ol { margin: 0.5em 0; padding-left: 20px; }
.node-content li { margin-bottom: 0.2em; }
.node-content code { font-family: var(--font-mono); background-color: rgba(0,0,0,0.2); padding: 0.1em 0.3em; border-radius: 3px; font-size: 0.9em; }
.node-content pre { font-family: var(--font-mono); background-color: rgba(0,0,0,0.2); padding: 0.5em; border-radius: 4px; overflow-x: auto; font-size: 0.9em; }
.node-content blockquote { border-left: 3px solid var(--accent-color-darker); margin: 0.5em 0 0.5em 10px; padding-left: 10px; color: #bbb; }
.node-content a { color: var(--accent-color); text-decoration: none; }
.node-content a:hover { text-decoration: underline; }

/* Interactive elements within node-content */
.node-content button, .node-content input, .node-content select, .node-content textarea {
    pointer-events: auto; /* Crucial for interaction */
    margin: 5px;
    padding: 5px 10px;
    background-color: var(--accent-color-darker);
    color: white;
    border: none;
    border-radius: 4px;
    cursor: pointer;
}
.node-content input[type="range"] { padding: 0; }
.node-content button:hover { background-color: var(--accent-color); }

/* Node Controls (hover buttons) */
.node-controls {
    position: absolute;
    top: 4px; right: 4px;
    display: flex;
    gap: 4px;
    opacity: 0;
    transition: opacity var(--transition-fast);
    pointer-events: none;
}
.node-html:hover .node-controls, .node-html.selected .node-controls {
    opacity: 0.9;
    pointer-events: auto;
}
.node-quick-button {
    background-color: var(--node-button-bg);
    color: var(--primary-color);
    border: none; border-radius: 4px;
    width: 22px; height: 22px;
    font-size: 14px; line-height: 22px; text-align: center;
    cursor: pointer;
    transition: background-color var(--transition-fast), transform var(--transition-fast);
}
.node-quick-button:hover { background-color: var(--node-button-hover-bg); transform: scale(1.1); }
.node-quick-button.delete-button { background-color: var(--delete-button-bg); color: var(--delete-button-text); font-weight: bold; }
.node-quick-button.delete-button:hover { background-color: #ff5555; }

/* Resize Handle */
.resize-handle {
    position: absolute;
    bottom: -1px; right: -1px;
    width: 16px; height: 16px;
    background-color: var(--accent-color);
    border-top: 1px solid var(--bg-color);
    border-left: 1px solid var(--bg-color);
    border-bottom-right-radius: 7px;
    cursor: nwse-resize;
    opacity: 0;
    transition: opacity var(--transition-fast), transform var(--transition-fast);
    pointer-events: auto;
    z-index: 10;
}
.node-html:hover .resize-handle, .node-html.selected .resize-handle { opacity: 0.7; }
.resize-handle:hover { opacity: 1; transform: scale(1.15); }

/* Context Menu & Dialogs */
.context-menu, .dialog {
    position: fixed;
    background-color: var(--menu-bg);
    border: 1px solid var(--menu-border);
    border-radius: 6px;
    box-shadow: 0 5px 25px rgba(0,0,0,0.6);
    z-index: 10000; /* Ensure UI is on top of everything */
    display: none; /* Controlled by JS */
    backdrop-filter: blur(8px);
    animation: fadeIn 0.1s ease-out forwards;
}
@keyframes fadeIn { from { opacity:0; transform:scale(0.95); } to { opacity:1; transform:scale(1); } }

.context-menu { padding: 6px 0; min-width: 180px; }
.context-menu ul { list-style:none; padding:0; margin:0; }
.context-menu li { padding: 8px 18px; cursor:pointer; transition: background-color var(--transition-fast), color var(--transition-fast); color: var(--primary-color); white-space:nowrap; }
.context-menu li:hover { background-color: var(--menu-hover-bg); color: var(--accent-color); }
.context-menu li.separator { height:1px; background-color:var(--accent-color-darker); margin:5px 0; padding:0; cursor:default; }
.context-menu li.separator:hover { background-color:var(--accent-color-darker); } /* No hover effect for separator */
.context-menu li[data-action^="delete"], .context-menu li.delete-action { color: var(--delete-button-bg); } /* Match delete button color */
.context-menu li[data-action^="delete"]:hover, .context-menu li.delete-action:hover { background-color: rgba(208,48,48,0.2); }

.dialog { top:50%; left:50%; transform:translate(-50%,-50%); padding:25px 30px; text-align:center; color:var(--primary-color); min-width:300px; }
.dialog p { margin:0 0 25px 0; font-size:1.1em; }
.dialog button { background-color:var(--accent-color); color:var(--bg-color); border:none; padding:10px 22px; margin:0 10px; border-radius:5px; cursor:pointer; font-weight:600; transition: background-color var(--transition-fast), box-shadow var(--transition-fast); min-width:80px; }
.dialog button:hover { background-color:#3fffff; box-shadow:0 0 12px var(--accent-color); }
.dialog button#confirm-no { background-color:#555; color:var(--primary-color); }
.dialog button#confirm-no:hover { background-color:#777; box-shadow:none; }

/* Status Indicator */
#status-indicator {
    position:fixed; bottom:10px; left:10px;
    background-color:rgba(0,0,0,0.7); color:var(--primary-color);
    padding:5px 12px; border-radius:4px; font-size:12px;
    z-index:5; opacity:1; transition:opacity 0.5s ease 1s;
    pointer-events:none;
}
#status-indicator.hidden { opacity:0; }

/* Edge Menu (for selected edges) */
.edge-menu-frame {
    position:absolute; /* Managed by CSS3DRenderer */
    background:var(--menu-bg); border:1px solid var(--accent-color); border-radius:4px;
    padding:4px; display:flex; gap:3px;
    pointer-events:auto; /* Interactive */
    z-index:100; opacity:0.9; transition:opacity 0.1s;
}
.edge-menu-frame button, .edge-menu-frame input, .edge-menu-frame select {
    background:var(--node-button-bg); color:var(--primary-color);
    border:none; border-radius:3px;
    height:22px; font-size:12px; line-height:20px; text-align:center;
    cursor:pointer; padding: 0 5px;
}
.edge-menu-frame button { width:22px; }
.edge-menu-frame button:hover, .edge-menu-frame input:hover, .edge-menu-frame select:hover { background:var(--node-button-hover-bg); }
.edge-menu-frame input[type="color"] { width: 30px; padding: 1px 2px; }
.edge-menu-frame input[type="range"] { width: 60px; }
.edge-menu-frame button.delete { background-color:var(--delete-button-bg); color:var(--delete-button-text); }

/* 3D Labels for ShapeNodes */
.node-label-3d {
    color: white;
    background-color: rgba(0,0,0,0.6);
    padding: 3px 6px;
    border-radius: 4px;
    font-size: 14px;
    text-align: center;
    pointer-events: none; /* Labels themselves are not interactive */
    white-space: nowrap;
}
.node-label-3d.selected { /* Example style for selected ShapeNode label */
    background-color: rgba(0, 208, 255, 0.3); /* Similar to node selection shadow */
    color: #fff;
}

/* Common class for node highlighting during linking (applied by JS) */
.node-common.linking-target { /* For ShapeNode labels */
    outline: 2px dashed #ffaa00;
}
.node-html.linking-target { /* For HtmlNodeElement itself */
    border-color: #ffaa00; /* Already defined, but ensure consistency */
    box-shadow: 0 0 20px 5px rgba(255, 170, 0, 0.5);
}