:root {
    --bg-dark: #0d1117;
    --bg-panel: #161b22;
    --border: #30363d;
    --text-main: #c9d1d9;
    --accent: #58a6ff;
    --success: #238636;
    --danger: #da3633;
    --font-mono: 'Share Tech Mono', monospace;
    --tutorial-bg: #000;
    --tutorial-text: #0f0;
    --tutorial-border: #0f0;
}

* { box-sizing: border-box; }

body {
    margin: 0;
    font-family: var(--font-mono);
    background: var(--bg-dark);
    color: var(--text-main);
    height: 100vh;
    overflow: hidden;
    display: flex;
    flex-direction: column;
}

/* Top Nav */
#top-nav {
    height: 50px;
    background: #010409;
    border-bottom: 1px solid var(--border);
    display: flex;
    align-items: center;
    padding: 0 1rem;
    justify-content: space-between;
}

.nav-group {
    display: flex;
    gap: 1rem;
    align-items: center;
}

.brand {
    color: var(--accent);
    font-weight: bold;
    margin-right: 1rem;
}

.nav-btn {
    background: none;
    border: 1px solid transparent;
    color: var(--text-main);
    font-size: 0.9rem;
    padding: 0.4rem 0.8rem;
    cursor: pointer;
}
.nav-btn:hover { border-color: var(--border); background: var(--bg-panel); }

#app-container {
    flex: 1;
    display: grid;
    grid-template-columns: 280px 1fr 320px; /* 3-column layout */
    overflow: hidden;
}

/* Left Sidebar: Node List */
#sidebar {
    background: var(--bg-panel);
    border-right: 1px solid var(--border);
    display: flex;
    flex-direction: column;
    padding: 0.5rem;
}

.sidebar-controls {
    margin-bottom: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

#node-list {
    flex: 1;
    overflow-y: auto;
    border-top: 1px solid var(--border);
    margin-top: 0.5rem;
}

.node-item {
    padding: 0.5rem;
    border-bottom: 1px solid #21262d;
    cursor: pointer;
    font-size: 0.9rem;
    display: flex;
    justify-content: space-between;
}

.node-item:hover { background: #21262d; }
.node-item.active { background: var(--accent); color: #000; }
.node-item.intro-node { border-left: 3px solid var(--success); }
.node-item .status-indicator { font-size: 0.8rem; opacity: 0.7; }

/* Center: Main Editor */
main {
    display: flex;
    flex-direction: column;
    background: #0d1117;
    overflow: hidden;
    border-right: 1px solid var(--border);
}

.hidden { display: none !important; }

.editor-header {
    padding: 1rem;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.id-group {
    display: flex;
    align-items: center;
    gap: 1rem;
}

#node-id {
    font-size: 1.1rem;
    width: 300px;
    background: #0d1117;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.5rem;
}

.scroll-container {
    flex: 1;
    overflow-y: auto;
    padding: 1rem;
}

.card {
    background: var(--bg-panel);
    border: 1px solid var(--border);
    padding: 1rem;
    margin-bottom: 1rem;
}

.card h2 {
    margin-top: 0;
    font-size: 1rem;
    color: var(--accent);
    border-bottom: 1px solid var(--border);
    padding-bottom: 0.5rem;
}

.form-group {
    margin-bottom: 1rem;
}

.form-group label {
    display: block;
    margin-bottom: 0.3rem;
    color: #8b949e;
    font-size: 0.9rem;
}

input, textarea, select {
    background: #0d1117;
    border: 1px solid var(--border);
    color: var(--text-main);
    padding: 0.5rem;
    font-family: var(--font-mono);
    width: 100%;
}
select:focus, input:focus, textarea:focus { border-color: var(--accent); outline: none; }

/* Code View */
#code-view-container {
    flex: 1;
    display: flex;
    flex-direction: column;
    padding: 1rem;
    background: #0d1117;
}

#code-editor {
    flex: 1;
    width: 100%;
    background: #0d1117;
    color: #f0f6fc;
    font-family: 'Consolas', 'Monaco', monospace;
    border: 1px solid var(--border);
    padding: 1rem;
    resize: none;
    font-size: 14px;
    line-height: 1.5;
}

/* Right Sidebar: Context (Minimap & Tutorial) */
#context-panel {
    background: var(--bg-panel);
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.context-section {
    flex: 1;
    display: flex;
    flex-direction: column;
    border-bottom: 1px solid var(--border);
    overflow: hidden;
}

.context-header {
    padding: 0.5rem;
    background: #010409;
    font-weight: bold;
    color: var(--accent);
    border-bottom: 1px solid var(--border);
    display: flex;
    justify-content: space-between;
    align-items: center;
}

#minimap-container {
    flex: 1;
    background: #0d1117;
    position: relative;
    overflow: hidden;
    display: flex;
    justify-content: center;
    align-items: center;
}

#tutorial-container {
    flex: 1;
    background: var(--tutorial-bg);
    color: var(--tutorial-text);
    font-family: 'Courier New', Courier, monospace;
    padding: 1rem;
    overflow-y: auto;
    border-top: 2px solid var(--tutorial-border);
    display: flex;
    flex-direction: column;
}

.tutorial-text {
    font-size: 0.9rem;
    line-height: 1.4;
    margin-bottom: 1rem;
}

.tutorial-action {
    margin-top: auto;
    text-align: center;
}

.highlight-tutorial {
    border: 2px solid #0f0 !important;
    box-shadow: 0 0 10px #0f0;
    position: relative;
    z-index: 10;
}

/* Intents */
.intent-card {
    background: #0d1117;
    border: 1px solid var(--border);
    padding: 1rem;
    margin-bottom: 1rem;
}
.intent-header { display: flex; justify-content: space-between; margin-bottom: 0.5rem; }
.intent-grid { display: grid; grid-template-columns: 1fr 1fr; gap: 1rem; }
.full-width { grid-column: span 2; }

/* Modals */
.modal-overlay {
    position: fixed; top: 0; left: 0; width: 100%; height: 100%;
    background: rgba(0,0,0,0.8);
    display: flex; justify-content: center; align-items: center;
    z-index: 100;
}
.modal {
    background: var(--bg-panel);
    border: 1px solid var(--accent);
    padding: 2rem;
    width: 500px;
    max-width: 90%;
    box-shadow: 0 0 20px rgba(0,0,0,0.5);
}
.modal h2 { margin-top: 0; color: var(--accent); }
.modal-footer { margin-top: 1rem; display: flex; justify-content: flex-end; gap: 1rem; }
.full-modal { width: 90%; height: 90%; display: flex; flex-direction: column; }
.modal-content-scroll { flex: 1; overflow-y: auto; border: 1px solid var(--border); padding: 1rem; background: #0d1117; }

#empty-state {
    flex: 1;
    display: flex;
    justify-content: center;
    align-items: center;
    color: #484f58;
}

.btn-primary { background: var(--accent); color: #000; border: none; padding: 0.5rem 1rem; cursor: pointer; }
.btn-danger { border-color: var(--danger); color: var(--danger); background: transparent; cursor: pointer; padding: 0.3rem 0.6rem; border: 1px solid var(--danger); }
.btn-secondary { cursor: pointer; padding: 0.5rem 1rem; border: 1px solid var(--border); background: transparent; color: var(--text-main); }
.btn-small { padding: 0.2rem 0.5rem; font-size: 0.8rem; }

/* Minimap Nodes (SVG styling) */
.mm-node { fill: var(--bg-panel); cursor: pointer; }
.mm-node:hover { fill: var(--accent); }
.mm-node.current { fill: var(--accent); stroke: #fff; }
.mm-node.intro { stroke: var(--success); }
.mm-link { stroke: #555; stroke-width: 1px; }
.mm-text { font-size: 10px; fill: #fff; text-anchor: middle; pointer-events: none; }

/* Tooltips */
.tooltip-container {
    position: relative;
    display: inline-block;
    margin-left: 0.5rem;
    cursor: help;
}

.tooltip-icon {
    display: inline-flex;
    justify-content: center;
    align-items: center;
    width: 16px;
    height: 16px;
    border-radius: 50%;
    background-color: var(--accent);
    color: var(--bg-dark);
    font-size: 10px;
    font-weight: bold;
}

.tooltip-text {
    visibility: hidden;
    width: 200px;
    background-color: var(--bg-panel);
    color: var(--text-main);
    text-align: left;
    border: 1px solid var(--accent);
    border-radius: 4px;
    padding: 0.5rem;
    position: absolute;
    z-index: 1000;
    bottom: 125%; /* Position above */
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    transition: opacity 0.3s;
    font-size: 0.8rem;
    box-shadow: 0 4px 6px rgba(0,0,0,0.3);
}

.tooltip-container:hover .tooltip-text {
    visibility: visible;
    opacity: 1;
}

/* Arrow for Tooltip */
.tooltip-text::after {
    content: "";
    position: absolute;
    top: 100%;
    left: 50%;
    margin-left: -5px;
    border-width: 5px;
    border-style: solid;
    border-color: var(--accent) transparent transparent transparent;
}

/* Required Field Marker */
.required-marker {
    color: var(--danger);
    margin-left: 0.2rem;
    font-weight: bold;
}