/* Tree View - Bootstrap-based styles for curriculum navigation */

/* Navigation Tree */
.navigation-tree {
    padding: 1rem;
    height: 100%;
}

/* Navigation Section - Bootstrap Card */
.navigation-section {
    margin-bottom: 0.5rem;
}

.section-header {
    display: flex;
    align-items: center;
    padding: 0.5rem;
    background: var(--bs-secondary-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.section-header:hover {
    background: var(--bs-tertiary-bg);
}

.collapse-icon {
    margin-right: 0.5rem;
    font-size: 0.875rem;
    color: var(--bs-secondary-color);
}

.count {
    margin-left: auto;
    font-size: 0.875rem;
    color: var(--bs-secondary-color);
}

.section-content {
    margin-top: 0.25rem;
    padding-left: 0.75rem;
}

/* Navigation Item - Bootstrap Button-like */
.nav-item {
    padding: 0.5rem;
    margin-bottom: 0.25rem;
    background: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
    cursor: pointer;
    font-size: 0.9rem;
    transition: all 0.2s ease;
}

.nav-item:hover {
    background: var(--bs-tertiary-bg);
    border-color: var(--bs-primary);
}

.nav-item.selected {
    background: var(--bs-primary-bg-subtle);
    border-color: var(--bs-primary);
    color: var(--bs-primary-text-emphasis);
    font-weight: 500;
}

.nav-item.greyed-out {
    opacity: 0.5;
    color: var(--bs-secondary-color);
}

.nav-item.greyed-out:hover {
    opacity: 0.8;
    background: var(--bs-tertiary-bg);
}

/* Content Area - Bootstrap Card */
.content-area {
    border-radius: var(--bs-border-radius-lg);
    padding: 1rem;
    border: 1px solid var(--bs-border-color);
    min-height: 400px;
    background: var(--bs-body-bg);
}

/* Curriculum Item Card */
.curriculum-item-card {
    background: var(--bs-body-bg);
    border: 1px solid var(--bs-border-color);
    border-radius: var(--bs-border-radius);
    padding: 1rem;
    margin-bottom: 0.75rem;
    transition: all 0.2s ease;
}

.curriculum-item-card:hover {
    border-color: var(--bs-primary);
    box-shadow: 0 1px 3px rgba(96, 159, 120, 0.1);
}

.curriculum-item-card.level-1 {
    border-left: 3px solid var(--bs-primary);
}

.curriculum-item-card.level-2 {
    margin-left: 2rem;
    border-left: 3px solid var(--bs-primary-bg-subtle);
}

.curriculum-item-card.level-3 {
    margin-left: 3rem;
    border-left: 3px solid var(--bs-primary-border-subtle);
}

.curriculum-children {
    margin-top: 0.5rem;
    display: flex;
    flex-direction: column;
    gap: 0.5rem;
}

.curriculum-item-header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    margin-bottom: 0.5rem;
}

.curriculum-item-title {
    margin: 0;
    font-size: 1rem;
    font-weight: 600;
}

.curriculum-item-card.level-1 .curriculum-item-title {
    font-size: 1rem;
}

.curriculum-item-card.level-2 .curriculum-item-title {
    font-size: 0.95rem;
}

.curriculum-item-card.level-3 .curriculum-item-title {
    font-size: 0.9rem;
}

/* Material Count Badge */
.material-count-badge {
    background-color: var(--bs-primary);
    color: white;
    padding: 0.25rem 0.5rem;
    border-radius: 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.2s ease;
    border: none;
}

.material-count-badge:hover {
    background-color: #4a7d5e;
}

.material-count-badge.zero {
    background-color: var(--bs-secondary);
}

/* Curriculum Heading - Collapsible */
.curriculum-heading {
    margin-bottom: 0.75rem;
    border-left: 3px solid var(--bs-primary);
    padding-left: 0.75rem;
}

.curriculum-heading-header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    padding: 0.75rem;
    cursor: pointer;
    transition: background 0.2s ease;
    border-radius: var(--bs-border-radius);
    margin: -0.5rem;
}

.curriculum-heading-header:hover {
    background: var(--bs-tertiary-bg);
}

.curriculum-heading-title {
    margin: 0;
    font-size: 1.1rem;
    font-weight: 600;
}

.heading-toggle {
    margin-left: 1rem;
}

.toggle-icon {
    font-size: 0.875rem;
    color: var(--bs-secondary-color);
    transition: transform 0.2s ease;
}

.curriculum-heading-content {
    max-height: 0;
    opacity: 0;
    overflow: hidden;
    transition: all 0.3s ease;
}

.curriculum-heading-content.expanded {
    max-height: 2000px;
    opacity: 1;
    padding: 1rem 0;
}

/* Competence and Content Groups */
.competence-group,
.content-group {
    margin-bottom: 1rem;
}

.competence-group-title,
.content-group-title {
    font-size: 0.875rem;
    font-weight: 500;
    margin-bottom: 0.5rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid var(--bs-border-color);
}

.competence-intro {
    font-size: 0.8rem;
    color: var(--bs-secondary-color);
    margin-bottom: 0.75rem;
    font-style: italic;
}

.competence-items,
.content-items {
    margin-left: 1rem;
}

.competence-item,
.content-item {
    margin-bottom: 0.5rem;
    padding: 0.5rem;
    background: var(--bs-tertiary-bg);
    border-radius: var(--bs-border-radius-sm);
}

.competence-text,
.content-text {
    font-size: 0.85rem;
    line-height: 1.4;
    margin: 0;
}

/* Loading States */
.loading-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    gap: 1rem;
    padding: 2rem;
}

.spinner {
    width: 2rem;
    height: 2rem;
    border: 3px solid var(--bs-border-color);
    border-top-color: var(--bs-primary);
    border-radius: 50%;
    animation: spin 1s linear infinite;
}

@keyframes spin {
    to {
        transform: rotate(360deg);
    }
}

.loading-text {
    color: var(--bs-secondary-color);
    font-size: 0.9rem;
    margin: 0;
}

/* Copy actions */
.curriculum-item-actions,
.heading-actions {
    display: flex;
    align-items: center;
    gap: 0.5rem;
}

.curriculum-item-copy,
.curriculum-heading-copy,
.competence-copy,
.content-copy {
    cursor: pointer;
    opacity: 0.6;
    transition: opacity 0.2s ease;
    font-size: 0.8rem;
    padding: 0.25rem;
    border-radius: var(--bs-border-radius-sm);
}

.curriculum-item-copy:hover,
.curriculum-heading-copy:hover,
.competence-copy:hover,
.content-copy:hover {
    opacity: 1;
    background-color: var(--bs-tertiary-bg);
}

/* Selection Checkbox (for modal selection mode) */
.curriculum-selection-checkbox {
    margin-right: 0.5rem;
    cursor: pointer;
    flex-shrink: 0;
}

.curriculum-item-header,
.heading-content,
.competence-item,
.content-item {
    display: flex;
    align-items: flex-start;
}

.competence-item,
.content-item {
    align-items: center;
}

/* Curriculum Tree Action Buttons */
.curriculum-delete-btn {
    min-width: 24px;
    height: 24px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1.5px solid #dc3545;
    background-color: #fff;
    color: #dc3545;
    border-radius: 4px;
    transition: all 0.15s ease;
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

/* Representative tree visual refinement */
.curriculum-node.rep-node-bundesland>span {
    font-weight: 700;
}

.curriculum-node.rep-node-planType>span {
    font-style: italic;
    color: var(--bs-secondary-color);
}

.curriculum-node.rep-node-schoolType>span,
.curriculum-node.rep-node-schoolLevel>span,
.curriculum-node.rep-node-subject>span {
    font-weight: 600;
}

.curriculum-node.rep-node-selected {
    background: var(--bs-warning-bg-subtle);
    border-left: 3px solid var(--bs-warning);
    padding: 2px 6px;
    border-radius: 4px;
}

.curriculum-delete-btn:hover {
    background-color: #dc3545;
    color: white;
    border-color: #dc3545;
    transform: scale(1.05);
    box-shadow: 0 2px 4px rgba(220, 53, 69, 0.2);
}

.curriculum-delete-btn:active {
    transform: scale(0.95);
}

.curriculum-add-btn {
    min-width: 24px;
    height: 24px;
    padding: 0;
    display: inline-flex;
    align-items: center;
    justify-content: center;
    border: 1.5px solid #198754;
    background-color: #fff;
    color: #198754;
    border-radius: 4px;
    transition: all 0.15s ease;
    cursor: pointer;
    font-size: 1.25rem;
    line-height: 1;
    font-weight: 700;
    font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, "Helvetica Neue", Arial, sans-serif;
}

.curriculum-add-btn:hover {
    background-color: #198754;
    color: white;
    border-color: #198754;
    transform: scale(1.05);
    box-shadow: 0 2px 4px rgba(25, 135, 84, 0.2);
}

.curriculum-add-btn:active {
    transform: scale(0.95);
}

/* Responsive */
@media (max-width: 768px) {

    .curriculum-item-card.level-2,
    .curriculum-item-card.level-3 {
        margin-left: 1rem;
    }
}