/**
 * Concept Hierarchie Mode Styles
 */

.concept-layout {
    display: grid;
    grid-template-columns: 240px 1fr 280px;
    gap: 1.5rem;
    padding: 1.5rem;
    min-height: calc(100vh - 200px);
}

.concept-sidebar {
    background: var(--paper-sand, #FDFBF7);
    border-radius: 8px;
    padding: 1rem;
    border: 1px solid var(--border-light, #E5E7EB);
}

.concept-sidebar h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary, #6B7280);
    margin: 0 0 0.75rem 0;
}

.tree-controls {
    display: flex;
    gap: 0.5rem;
    margin-bottom: 1rem;
}

.tree-controls button {
    flex: 1;
    padding: 0.5rem;
    font-size: 0.75rem;
    background: white;
    border: 1px solid var(--border-light, #E5E7EB);
    border-radius: 4px;
    cursor: pointer;
    transition: all 0.15s ease;
}

.tree-controls button:hover {
    background: var(--navigator-primary, #8B5CF6);
    color: white;
    border-color: var(--navigator-primary, #8B5CF6);
}

.search-box {
    margin-bottom: 1rem;
}

.search-box input {
    width: 100%;
    padding: 0.5rem 0.75rem;
    border: 1px solid var(--border-light, #E5E7EB);
    border-radius: 4px;
    font-size: 0.875rem;
}

.search-box input:focus {
    outline: none;
    border-color: var(--navigator-primary, #8B5CF6);
    box-shadow: 0 0 0 3px rgba(139, 92, 246, 0.1);
}

.stats-section {
    margin-top: 1.5rem;
    padding-top: 1rem;
    border-top: 1px solid var(--border-light, #E5E7EB);
}

.stats-list {
    display: grid;
    grid-template-columns: 1fr auto;
    gap: 0.25rem 0.5rem;
    margin: 0;
    font-size: 0.875rem;
}

.stats-list dt {
    color: var(--text-secondary, #6B7280);
}

.stats-list dd {
    margin: 0;
    font-weight: 600;
    text-align: right;
}

/* Main Tree Area */
.concept-main {
    background: white;
    border-radius: 8px;
    border: 1px solid var(--border-light, #E5E7EB);
    padding: 1rem;
    overflow: auto;
}

#hierarchy-tree {
    font-family: var(--font-mono, 'JetBrains Mono', monospace);
    font-size: 0.875rem;
}

.tree-item {
    user-select: none;
}

.tree-node {
    display: flex;
    align-items: center;
    gap: 0.25rem;
    padding: 0.375rem 0.5rem;
    border-radius: 4px;
    cursor: pointer;
    transition: background 0.1s ease;
}

.tree-node:hover {
    background: var(--paper-sand, #FDFBF7);
}

.tree-node.selected {
    background: rgba(139, 92, 246, 0.1);
    color: var(--navigator-primary, #8B5CF6);
}

.expand-btn {
    width: 20px;
    height: 20px;
    display: flex;
    align-items: center;
    justify-content: center;
    background: none;
    border: none;
    cursor: pointer;
    padding: 0;
    color: var(--text-secondary, #6B7280);
    transition: transform 0.15s ease;
}

.expand-btn.expanded .expand-icon {
    transform: rotate(0deg);
}

.expand-placeholder {
    width: 20px;
    height: 20px;
}

.concept-label {
    flex: 1;
}

.concept-label mark {
    background: rgba(139, 92, 246, 0.2);
    padding: 0 2px;
    border-radius: 2px;
}

.child-count {
    font-size: 0.75rem;
    color: var(--text-tertiary, #9CA3AF);
    margin-left: 0.25rem;
}

.tree-children {
    border-left: 1px dashed var(--border-light, #E5E7EB);
    margin-left: 17px;
}

/* Context Panel */
.concept-context {
    display: flex;
    flex-direction: column;
    gap: 1rem;
}

#concept-detail {
    background: var(--paper-sand, #FDFBF7);
    border-radius: 8px;
    padding: 1rem;
    border: 1px solid var(--border-light, #E5E7EB);
}

#concept-detail.hidden {
    display: none;
}

#concept-detail h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary, #6B7280);
    margin: 0 0 0.75rem 0;
}

#concept-detail dl {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.25rem 0.75rem;
    margin: 0;
    font-size: 0.8125rem;
}

#concept-detail dt {
    color: var(--text-secondary, #6B7280);
}

#concept-detail dd {
    margin: 0;
    word-break: break-word;
}

#concept-detail dd a {
    color: var(--navigator-primary, #8B5CF6);
    text-decoration: none;
    font-size: 0.75rem;
}

#concept-detail dd a:hover {
    text-decoration: underline;
}

.keyboard-hints {
    background: var(--paper-sand, #FDFBF7);
    border-radius: 8px;
    padding: 1rem;
    border: 1px solid var(--border-light, #E5E7EB);
}

.keyboard-hints h3 {
    font-size: 0.75rem;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    color: var(--text-secondary, #6B7280);
    margin: 0 0 0.75rem 0;
}

.hint-list {
    display: grid;
    grid-template-columns: auto 1fr;
    gap: 0.25rem 0.5rem;
    margin: 0;
    font-size: 0.75rem;
}

.hint-list dt {
    font-family: var(--font-mono, monospace);
    background: white;
    padding: 0.125rem 0.375rem;
    border-radius: 3px;
    border: 1px solid var(--border-light, #E5E7EB);
}

.hint-list dd {
    margin: 0;
    color: var(--text-secondary, #6B7280);
    display: flex;
    align-items: center;
}

/* Responsive */
@media (max-width: 1024px) {
    .concept-layout {
        grid-template-columns: 1fr;
    }

    .concept-sidebar,
    .concept-context {
        display: none;
    }
}