:root {
    --primary: #3B82F6;
    --prompt-color: #3B82F6;
    --condition-color: #EAB308;
    --output-color: #22C55E;
    --loop-color: #A855F7;
    --comment-color: #6B7280;
    --error-color: #EF4444;
    --neon: #06B6D4;
    --bg: #0B1120;
    --bg-panel: rgba(15, 23, 42, 0.92);
    --border: rgba(255, 255, 255, 0.07);
    --text: #F1F5F9;
    --text-muted: #94A3B8;
    --radius: 10px;
    --transition: all 0.2s ease;
}

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

body {
    font-family: 'Inter', system-ui, sans-serif;
    background: var(--bg);
    color: var(--text);
    height: 100vh;
    overflow: hidden;
}

.app {
    display: flex;
    flex-direction: column;
    height: 100vh;
}

/* Header */
header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.6rem 1rem;
    background: var(--bg-panel);
    border-bottom: 1px solid var(--border);
    flex-shrink: 0;
}

h1 {
    font-size: 1.1rem;
    font-weight: 700;
    background: linear-gradient(135deg, var(--neon), var(--primary));
    -webkit-background-clip: text;
    background-clip: text;
    -webkit-text-fill-color: transparent;
}

.header-actions {
    display: flex;
    gap: 0.4rem;
    align-items: center;
}

select {
    padding: 0.35rem 0.5rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.3);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
}

/* Workspace */
.workspace {
    display: flex;
    flex: 1;
    overflow: hidden;
}

/* Sidebar */
.sidebar {
    width: 260px;
    padding: 1rem;
    border-right: 1px solid var(--border);
    overflow-y: auto;
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    gap: 0.75rem;
}

.sidebar h2 {
    font-size: 0.95rem;
    font-weight: 600;
}

.node-palette {
    display: flex;
    flex-direction: column;
    gap: 0.4rem;
}

.palette-btn {
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border);
    border-radius: 8px;
    background: rgba(0, 0, 0, 0.2);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 0.85rem;
    cursor: pointer;
    transition: var(--transition);
    text-align: left;
}

.palette-btn:hover {
    transform: translateX(3px);
}

.palette-btn.prompt {
    border-left: 3px solid var(--prompt-color);
}

.palette-btn.condition {
    border-left: 3px solid var(--condition-color);
}

.palette-btn.output {
    border-left: 3px solid var(--output-color);
}

.palette-btn.loop {
    border-left: 3px solid var(--loop-color);
}

.palette-btn.comment {
    border-left: 3px solid var(--comment-color);
}

/* Node Editor */
.node-editor h3 {
    font-size: 0.9rem;
    margin-bottom: 0.5rem;
}

.editor-field {
    margin-bottom: 0.6rem;
}

.editor-field label {
    display: block;
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-bottom: 0.2rem;
}

.opt {
    font-size: 0.65rem;
    opacity: 0.5;
}

input[type="text"],
input[type="number"],
textarea {
    width: 100%;
    padding: 0.4rem 0.55rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: rgba(0, 0, 0, 0.3);
    color: var(--text);
    font-family: 'Inter', sans-serif;
    font-size: 0.8rem;
    transition: var(--transition);
}

textarea {
    font-family: ui-monospace, monospace;
    font-size: 0.78rem;
    resize: vertical;
}

input:focus,
textarea:focus {
    outline: none;
    border-color: var(--neon);
}

.hidden {
    display: none !important;
}

/* Buttons */
.btn {
    width: 100%;
    padding: 0.45rem 0.8rem;
    border: none;
    border-radius: 8px;
    font-weight: 600;
    font-family: 'Inter', sans-serif;
    cursor: pointer;
    transition: var(--transition);
    color: #fff;
    font-size: 0.85rem;
}

.btn.primary {
    background: var(--primary);
}

.btn.primary:hover {
    background: #2563eb;
}

.btn-sm {
    padding: 0.3rem 0.55rem;
    border: 1px solid var(--border);
    border-radius: 6px;
    background: transparent;
    color: var(--text-muted);
    font-size: 0.7rem;
    cursor: pointer;
    transition: var(--transition);
    font-family: 'Inter', sans-serif;
}

.btn-sm:hover {
    border-color: var(--neon);
    color: var(--neon);
}

.chain-info {
    font-size: 0.75rem;
    color: var(--text-muted);
    margin-top: auto;
    padding-top: 0.5rem;
    border-top: 1px solid var(--border);
}

/* Canvas */
.canvas-wrapper {
    flex: 1;
    position: relative;
    background: var(--bg);
    background-image:
        radial-gradient(circle, rgba(255, 255, 255, 0.03) 1px, transparent 1px);
    background-size: 20px 20px;
    cursor: grab;
    overflow: hidden;
}

.canvas-wrapper:active {
    cursor: grabbing;
}

canvas {
    position: absolute;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
}

@media (max-width: 768px) {
    .sidebar {
        width: 200px;
    }
}