:root {
    --primary: #2563eb;
    --primary-dark: #1d4ed8;
    --primary-light: #dbeafe;
    --text: #1f2937;
    --text-secondary: #6b7280;
    --text-disabled: #9ca3af;
    --bg: #ffffff;
    --bg-page: #f9fafb;
    --border: #e5e7eb;
    --hover: #f3f4f6;
    --success: #059669;
    --error: #dc2626;
}

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

body {
    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, sans-serif;
    font-size: 13px;
    line-height: 1.4;
    color: var(--text);
    background: var(--bg-page);
}

.container {
    max-width: 100%;
    padding: 8px;
}

.header {
    background: var(--bg);
    padding: 12px 16px;
    margin-bottom: 8px;
    border-bottom: 1px solid var(--border);
}

.header h1 {
    font-size: 18px;
    font-weight: 600;
    color: var(--primary);
    margin-bottom: 4px;
}

.header p {
    font-size: 12px;
    color: var(--text-secondary);
}

.auth-section {
    background: var(--bg);
    padding: 16px;
    margin-bottom: 8px;
    text-align: center;
    border: 1px solid var(--border);
}

.btn {
    background: var(--primary);
    color: white;
    padding: 8px 16px;
    border: none;
    border-radius: 4px;
    cursor: pointer;
    font-size: 13px;
    margin: 4px;
}

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

.btn-small {
    padding: 4px 8px;
    font-size: 12px;
}

.btn-secondary {
    background: var(--text-secondary);
}

.btn-danger {
    background: var(--error);
}

.btn-danger:hover {
    background: #b91c1c;
}

.main-content {
    display: grid;
    grid-template-columns: 280px 1fr;
    gap: 8px;
    height: calc(100vh - 140px);
}

.sidebar {
    background: var(--bg);
    padding: 8px;
    overflow-y: auto;
    border: 1px solid var(--border);
}

.content-area {
    background: var(--bg);
    padding: 16px;
    overflow-y: auto;
    border: 1px solid var(--border);
}

/* Compact node list */
.node-tree {
    margin-top: 8px;
}

.node-item {
    padding: 6px 8px;
    margin: 2px 0;
    border: 1px solid var(--border);
    border-radius: 3px;
    cursor: pointer;
    font-size: 13px;
    line-height: 1.3;
}

.node-item:hover {
    background: var(--hover);
}

.node-item.selected {
    background: var(--primary-light);
    border-color: var(--primary);
}

/* Compact projects */
.projects-section {
    margin-top: 12px;
    padding-top: 12px;
    border-top: 1px solid var(--border);
}

.projects-section h3 {
    font-size: 13px;
    font-weight: 600;
    margin-bottom: 6px;
}

.project-item {
    padding: 6px 8px;
    margin: 4px 0;
    border: 1px solid var(--border);
    border-radius: 3px;
    font-size: 12px;
    line-height: 1.3;
}

.project-item h4 {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 2px;
}

.project-item p {
    font-size: 11px;
    color: var(--text-secondary);
}

.project-actions {
    margin-top: 4px;
}

/* Forms */
.form-group {
    margin-bottom: 12px;
}

.form-group label {
    display: block;
    margin-bottom: 4px;
    font-size: 12px;
    font-weight: 600;
}

.form-group input,
.form-group textarea {
    width: 100%;
    padding: 6px 8px;
    border: 1px solid var(--border);
    border-radius: 3px;
    font-size: 13px;
}

.form-group textarea {
    min-height: 200px;
    font-family: 'Monaco', 'Menlo', monospace;
    font-size: 12px;
}

.hidden {
    display: none;
}

.message {
    padding: 8px 12px;
    margin: 8px 0;
    border-radius: 3px;
    font-size: 12px;
}

.message.error {
    color: var(--error);
    background: #fef2f2;
    border: 1px solid var(--error);
}

.message.success {
    color: var(--success);
    background: #ecfdf5;
    border: 1px solid var(--success);
}

/* COMPACT HIERARCHICAL TREE */
.hierarchical-tree {
    border: 1px solid var(--border);
    border-radius: 3px;
    padding: 8px;
    background: var(--bg);
    height: calc(100vh - 250px);
    overflow-y: auto;
    overflow-x: auto;
    font-size: 13px;
    text-align: left;
    width: 100%;
}

.tree-node-flat {
    padding: 4px;
    line-height: 20px;
    min-height: 24px;
    display: block;
    white-space: nowrap;
    text-align: left;
}

.tree-node-flat:hover {
    background: var(--hover);
}

.tree-node-flat input.tree-node-checkbox {
    vertical-align: middle;
    margin: 0 8px 0 0;
    width: 16px;
    height: 16px;
}

.tree-node-flat span.tree-node-label {
    vertical-align: middle;
    display: inline;
    color: #1f2937 !important;
    font-size: 14px;
    font-weight: normal;
}

.tree-node {
    margin: 0;
    padding: 0;
}

.tree-node-content {
    padding: 2px 4px;
    line-height: 22px;
    height: 22px;
}

.tree-node-content:hover {
    background: var(--hover);
    border-radius: 2px;
}

.tree-node-toggle {
    display: inline-block;
    width: 16px;
    height: 16px;
    margin-right: 4px;
    border: none;
    background: none;
    cursor: pointer;
    color: var(--text-secondary);
    font-size: 12px;
    vertical-align: middle;
    padding: 0;
    line-height: 16px;
    text-align: center;
}

.tree-node-toggle.hidden {
    visibility: hidden;
}

.tree-node-checkbox {
    display: inline-block;
    width: 14px;
    height: 14px;
    margin: 0 6px 0 0;
    cursor: pointer;
    vertical-align: middle;
}

.tree-node-checkbox:disabled {
    opacity: 0.5;
}

.tree-node-label {
    display: inline;
    cursor: pointer;
    color: var(--text);
    font-size: 13px;
    font-weight: 400;
    vertical-align: middle;
    white-space: nowrap;
}

.tree-node-label.disabled {
    color: var(--text-disabled);
}

.tree-node-children {
    margin-left: 20px;
    border-left: 1px solid var(--border);
    padding-left: 8px;
}

.tree-node-children.collapsed {
    display: none;
}

/* Utility */
.form-actions {
    display: flex;
    gap: 8px;
    margin-top: 12px;
}

.create-node-form {
    background: var(--hover);
    padding: 12px;
    border: 1px solid var(--border);
    border-radius: 3px;
    margin: 8px 0;
}