/**
 * search_builder.css
 * V4.1 Search Builder styles. All classes use kn- prefix to avoid Tailwind conflicts.
 */

/* === SEARCH HEADER === */
.kn-search-header {
    padding: 0.75rem 1rem;
    background: #f9fafb;
    border-bottom: 1px solid #e5e7eb;
}

.kn-search-bar {
    display: flex;
    gap: 0.5rem;
    align-items: center;
    flex-wrap: wrap;
}

.kn-field-select {
    background: white;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    min-width: 10rem;
    cursor: pointer;
    outline: none;
}

.kn-field-select:focus {
    border-color: #3b82f6;
}

.kn-field-select optgroup {
    font-weight: 600;
    color: #374151;
}

.kn-search-input {
    flex: 1;
    min-width: 160px;
    background: white;
    border: 1px solid #d1d5db;
    border-radius: 0.5rem;
    padding: 0.5rem 0.75rem;
    font-size: 0.8125rem;
    outline: none;
}

.kn-search-input:focus {
    border-color: #3b82f6;
}

.kn-btn-add-rule {
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    color: #2563eb;
    border-radius: 0.5rem;
    width: 2.25rem;
    height: 2.25rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s;
    flex-shrink: 0;
}

.kn-btn-add-rule:hover {
    background: #dbeafe;
    border-color: #93c5fd;
}

.kn-btn-search {
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 0.5rem;
    padding: 0.5rem 1.25rem;
    font-size: 0.8125rem;
    font-weight: 500;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.375rem;
    transition: background 0.15s;
    flex-shrink: 0;
}

.kn-btn-search:hover {
    background: #1d4ed8;
}

.kn-estimate-badge {
    font-size: 0.6875rem;
    color: #6b7280;
    background: #f3f4f6;
    border: 1px solid #e5e7eb;
    border-radius: 999px;
    padding: 0.125rem 0.5rem;
    white-space: nowrap;
    display: none;
}

.kn-estimate-badge.visible {
    display: inline-block;
}

/* === TOKEN ROWS === */
.kn-token-rows {
    display: flex;
    flex-direction: column;
    gap: 0.25rem;
    margin-top: 0.5rem;
}

.kn-token-row {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 0.25rem 0.5rem;
    min-height: 2rem;
    flex-wrap: wrap;
}

.kn-token-row-label {
    font-size: 0.6875rem;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    white-space: nowrap;
    min-width: 4rem;
    padding: 0.125rem 0.375rem;
    background: #f9fafb;
    border-radius: 0.25rem;
    border: 1px solid #f3f4f6;
}

/* Row-level operator indicator (shows between rows) */
.kn-row-op {
    font-size: 0.625rem;
    font-weight: 700;
    padding: 0.125rem 0.375rem;
    border-radius: 0.25rem;
    cursor: pointer;
    transition: all 0.15s;
    flex-shrink: 0;
}

.kn-token-pill {
    display: inline-flex;
    align-items: center;
    gap: 0.25rem;
    font-size: 0.75rem;
    padding: 0.125rem 0.375rem;
    border-radius: 0.375rem;
    background: #eff6ff;
    border: 1px solid #bfdbfe;
    color: #1e40af;
    white-space: nowrap;
    cursor: default;
}

.kn-token-pill .kn-pill-op {
    font-size: 0.625rem;
    font-weight: 700;
    color: #2563eb;
    cursor: pointer;
    padding: 0 0.125rem;
    border-radius: 0.25rem;
    transition: background 0.15s;
}

.kn-token-pill .kn-pill-op:hover {
    background: #dbeafe;
}

.kn-token-pill .kn-pill-remove {
    font-size: 0.625rem;
    color: #9ca3af;
    cursor: pointer;
    margin-left: 0.125rem;
    transition: color 0.15s;
}

.kn-token-pill .kn-pill-remove:hover {
    color: #ef4444;
}

.kn-token-input {
    border: none;
    outline: none;
    font-size: 0.75rem;
    flex: 1;
    min-width: 80px;
    padding: 0.125rem 0.25rem;
    background: transparent;
}

.kn-token-hint {
    font-size: 0.6875rem;
    color: #9ca3af;
    padding-left: 0.25rem;
}

/* === OPERATOR POPUP === */
.kn-operator-popup {
    position: absolute;
    z-index: 50;
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    box-shadow: 0 4px 12px rgba(0,0,0,0.1);
    padding: 0.375rem;
    display: none;
}

.kn-operator-popup.visible {
    display: flex;
    gap: 0.25rem;
}

.kn-operator-popup button {
    padding: 0.25rem 0.625rem;
    font-size: 0.75rem;
    font-weight: 600;
    border-radius: 0.375rem;
    cursor: pointer;
    border: 1px solid transparent;
    transition: all 0.15s;
}

.kn-op-and { background: #dcfce7; color: #166534; border-color: #bbf7d0; }
.kn-op-and:hover { background: #bbf7d0; }
.kn-op-or { background: #fef9c3; color: #854d0e; border-color: #fef08a; }
.kn-op-or:hover { background: #fef08a; }
.kn-op-not { background: #fee2e2; color: #991b1b; border-color: #fecaca; }
.kn-op-not:hover { background: #fecaca; }

/* === ADVANCED BAR === */
.kn-advanced-bar {
    border-top: 1px solid #e5e7eb;
    background: #f9fafb;
}

.kn-advanced-header {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.375rem 1rem;
    cursor: pointer;
    user-select: none;
}

.kn-advanced-header label {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    font-size: 0.75rem;
    font-weight: 600;
    color: #6b7280;
    cursor: pointer;
}

.kn-advanced-content {
    display: none;
    padding: 0.5rem 1rem 0.75rem;
    gap: 0.75rem;
    flex-wrap: wrap;
    border-top: 1px solid #f3f4f6;
}

.kn-advanced-content.open {
    display: flex;
}

.kn-advanced-group {
    display: flex;
    align-items: center;
    gap: 0.375rem;
}

.kn-advanced-group label {
    font-size: 0.6875rem;
    color: #6b7280;
    font-weight: 500;
    white-space: nowrap;
}

.kn-year-input {
    width: 4.5rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    padding: 0.25rem 0.375rem;
    font-size: 0.75rem;
    background: white;
    outline: none;
}

.kn-year-input:focus {
    border-color: #3b82f6;
}

.kn-lang-select {
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    padding: 0.25rem 0.375rem;
    font-size: 0.75rem;
    background: white;
    outline: none;
    cursor: pointer;
}

.kn-filter-chip {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    font-size: 0.6875rem;
    border-radius: 999px;
    border: 1px solid #d1d5db;
    background: white;
    color: #4b5563;
    cursor: pointer;
    transition: all 0.15s;
    white-space: nowrap;
}

.kn-filter-chip:hover {
    border-color: #93c5fd;
    background: #eff6ff;
}

.kn-filter-chip.active {
    background: #2563eb;
    color: white;
    border-color: #2563eb;
}

.kn-btn-view-query {
    font-size: 0.6875rem;
    color: #6b7280;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    border: none;
    background: none;
    padding: 0.25rem 0.5rem;
    border-radius: 0.375rem;
    transition: all 0.15s;
}

.kn-btn-view-query:hover {
    color: #2563eb;
    background: #eff6ff;
}

/* === QUERY POPUP === */
.kn-query-popup-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0,0,0,0.4);
    backdrop-filter: blur(2px);
    z-index: 100;
    display: none;
    align-items: center;
    justify-content: center;
    padding: 1rem;
}

.kn-query-popup-overlay.visible {
    display: flex;
}

.kn-query-popup {
    background: white;
    border-radius: 0.75rem;
    box-shadow: 0 10px 25px rgba(0,0,0,0.15);
    max-width: 36rem;
    width: 100%;
    overflow: hidden;
}

.kn-query-popup-header {
    padding: 0.75rem 1rem;
    background: #f9fafb;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: center;
}

.kn-query-popup-header h3 {
    font-size: 0.875rem;
    font-weight: 700;
    color: #111827;
}

.kn-query-popup-body {
    padding: 1rem;
}

.kn-query-popup-body pre {
    background: #f3f4f6;
    border: 1px solid #e5e7eb;
    border-radius: 0.5rem;
    padding: 0.75rem;
    font-size: 0.75rem;
    font-family: ui-monospace, monospace;
    white-space: pre-wrap;
    word-break: break-all;
    color: #1f2937;
    max-height: 12rem;
    overflow-y: auto;
}

.kn-query-popup-footer {
    padding: 0.75rem 1rem;
    border-top: 1px solid #e5e7eb;
    display: flex;
    justify-content: flex-end;
    gap: 0.5rem;
}

/* === IMPORT BAR === */
.kn-import-bar {
    display: flex;
    align-items: center;
    gap: 0.5rem;
    padding: 0.375rem 1rem;
    border-bottom: 1px solid #e5e7eb;
    background: #fafbfc;
    flex-wrap: wrap;
}

.kn-import-label {
    font-size: 0.6875rem;
    font-weight: 600;
    color: #6b7280;
    text-transform: uppercase;
    white-space: nowrap;
}

.kn-import-pill {
    display: inline-flex;
    align-items: center;
    padding: 0.125rem 0.5rem;
    font-size: 0.6875rem;
    border-radius: 999px;
    border: 1px solid #d1d5db;
    background: white;
    color: #4b5563;
    cursor: pointer;
    transition: all 0.15s;
    user-select: none;
}

.kn-import-pill.active {
    background: #2563eb;
    color: white;
    border-color: #2563eb;
}

.kn-import-pill.locked {
    background: #e5e7eb;
    color: #6b7280;
    cursor: default;
    border-color: #d1d5db;
}

/* === RESULTS BAR === */
.kn-results-bar {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.375rem 1rem;
    background: #eff6ff;
    border-bottom: 1px solid #bfdbfe;
    font-size: 0.75rem;
}

.kn-results-bar-left {
    display: flex;
    align-items: center;
    gap: 0.75rem;
}

.kn-per-page-select {
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    padding: 0.125rem 0.375rem;
    font-size: 0.6875rem;
    background: white;
    cursor: pointer;
    outline: none;
}

.kn-results-count {
    font-weight: 600;
    color: #1e40af;
}

/* === SELECT-ALL ROW === */
.kn-select-all-row {
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0.375rem 1rem;
    background: #f9fafb;
    border-bottom: 1px solid #e5e7eb;
    font-size: 0.75rem;
}

.kn-selected-count {
    font-weight: 600;
    color: #1e40af;
}

.kn-btn-add-selected {
    background: #16a34a;
    color: white;
    border: none;
    border-radius: 0.375rem;
    padding: 0.25rem 0.75rem;
    font-size: 0.6875rem;
    font-weight: 600;
    cursor: pointer;
    display: flex;
    align-items: center;
    gap: 0.25rem;
    transition: background 0.15s;
}

.kn-btn-add-selected:hover {
    background: #15803d;
}

.kn-btn-add-selected:disabled {
    background: #d1d5db;
    cursor: not-allowed;
}

/* === RESULT CARDS === */
.kn-result-card {
    padding: 0.75rem 1rem;
    border-bottom: 1px solid #f3f4f6;
    transition: background 0.15s;
    display: flex;
    gap: 0.5rem;
}

.kn-result-card:hover {
    background: #f9fafb;
}

.kn-result-card-checkbox {
    padding-top: 0.125rem;
    flex-shrink: 0;
}

.kn-result-card-body {
    flex: 1;
    min-width: 0;
}

.kn-result-title {
    font-size: 0.8125rem;
    font-weight: 600;
    color: #1e40af;
    cursor: pointer;
    line-height: 1.3;
    transition: color 0.15s;
}

.kn-result-title:hover {
    color: #1d4ed8;
    text-decoration: underline;
}

.kn-result-meta {
    font-size: 0.6875rem;
    color: #6b7280;
    margin-top: 0.25rem;
    display: flex;
    flex-wrap: wrap;
    gap: 0.375rem;
    align-items: center;
}

.kn-result-tags {
    display: flex;
    flex-wrap: wrap;
    gap: 0.25rem;
    margin-top: 0.375rem;
}

.kn-tag {
    display: inline-flex;
    align-items: center;
    font-size: 0.625rem;
    padding: 0.0625rem 0.375rem;
    border-radius: 0.25rem;
    white-space: nowrap;
    cursor: pointer;
    transition: all 0.15s;
    position: relative;
}

.kn-tag.mesh { background: #f3e8ff; color: #6b21a8; border: 1px solid #e9d5ff; }
.kn-tag.mesh:hover { background: #e9d5ff; }
.kn-tag.pubtype { background: #fce7f3; color: #9d174d; border: 1px solid #fbcfe8; }
.kn-tag.pubtype:hover { background: #fbcfe8; }
.kn-tag.affiliation { background: #fff7ed; color: #c2410c; border: 1px solid #fed7aa; }
.kn-tag.affiliation:hover { background: #fed7aa; }

.kn-tag-actions {
    display: none;
    position: absolute;
    top: 100%;
    left: 0;
    z-index: 30;
    background: white;
    border: 1px solid #e5e7eb;
    border-radius: 0.375rem;
    box-shadow: 0 2px 8px rgba(0,0,0,0.08);
    padding: 0.125rem;
    margin-top: 0.125rem;
}

.kn-tag:hover .kn-tag-actions {
    display: flex;
    gap: 0.125rem;
}

.kn-tag-actions button {
    padding: 0.125rem 0.375rem;
    font-size: 0.625rem;
    font-weight: 700;
    border-radius: 0.25rem;
    cursor: pointer;
    border: none;
    transition: background 0.15s;
}

.kn-result-card-actions {
    flex-shrink: 0;
    display: flex;
    align-items: flex-start;
    padding-top: 0.125rem;
}

.kn-btn-add-single {
    background: #dcfce7;
    color: #166534;
    border: 1px solid #bbf7d0;
    border-radius: 50%;
    width: 1.75rem;
    height: 1.75rem;
    display: flex;
    align-items: center;
    justify-content: center;
    cursor: pointer;
    transition: all 0.15s;
    font-size: 0.6875rem;
}

.kn-btn-add-single:hover {
    background: #bbf7d0;
    border-color: #86efac;
}

/* === EXPAND/COLLAPSE BUTTONS === */
.kn-expand-btn {
    display: inline-flex;
    align-items: center;
    font-size: 0.625rem;
    font-weight: 600;
    padding: 0.0625rem 0.375rem;
    border-radius: 999px;
    background: #eff6ff;
    color: #2563eb;
    border: 1px solid #bfdbfe;
    cursor: pointer;
    white-space: nowrap;
    transition: all 0.15s;
    vertical-align: middle;
    margin-left: 0.125rem;
}

.kn-expand-btn:hover {
    background: #dbeafe;
    border-color: #93c5fd;
}

/* === CLICKABLE METADATA === */
.kn-meta-clickable {
    cursor: pointer;
    transition: color 0.15s;
}

.kn-meta-clickable:hover {
    color: #2563eb;
    text-decoration: underline;
}

/* === FACET SIDEBAR === */
.kn-facets {
    width: 14rem;
    min-width: 14rem;
    border-left: 1px solid #e5e7eb;
    background: #fafbfc;
    overflow-y: auto;
    padding: 0.5rem;
    display: none;
}

.kn-facets.visible {
    display: block;
}

.kn-facet-group {
    margin-bottom: 0.5rem;
    background: white;
    border: 1px solid #f3f4f6;
    border-radius: 0.5rem;
    overflow: hidden;
}

.kn-facet-title {
    font-size: 0.6875rem;
    font-weight: 700;
    color: #374151;
    padding: 0.375rem 0.5rem;
    background: #f9fafb;
    border-bottom: 1px solid #f3f4f6;
    cursor: pointer;
    display: flex;
    justify-content: space-between;
    align-items: center;
    user-select: none;
}

.kn-facet-title .kn-facet-toggle {
    transition: transform 0.2s;
    font-size: 0.5rem;
    color: #9ca3af;
}

.kn-facet-title.collapsed .kn-facet-toggle {
    transform: rotate(-90deg);
}

.kn-facet-items {
    padding: 0.25rem 0.375rem;
}

.kn-facet-items.collapsed {
    display: none;
}

.kn-facet-item {
    display: flex;
    align-items: center;
    gap: 0.375rem;
    padding: 0.1875rem 0.125rem;
    font-size: 0.6875rem;
    color: #4b5563;
    cursor: pointer;
    border-radius: 0.25rem;
    transition: background 0.15s;
}

.kn-facet-item:hover {
    background: #f3f4f6;
}

.kn-facet-item-count {
    margin-left: auto;
    font-size: 0.625rem;
    color: #9ca3af;
    font-weight: 500;
}

.kn-facet-show-more {
    font-size: 0.6875rem;
    font-weight: 600;
    color: #2563eb;
    cursor: pointer;
    text-align: center;
    padding: 0.25rem 0.375rem;
    border-radius: 0.25rem;
    transition: all 0.15s;
}

.kn-facet-show-more:hover {
    background: #eff6ff;
    color: #1d4ed8;
}

.kn-facet-clear {
    font-size: 0.625rem;
    color: #ef4444;
    cursor: pointer;
    padding: 0.25rem 0.5rem;
    border: none;
    background: none;
    text-align: left;
    transition: color 0.15s;
}

.kn-facet-clear:hover {
    color: #dc2626;
    text-decoration: underline;
}

/* === ARTICLE PANEL (LEFT SIDE SLIDE-IN) === */
.kn-article-panel {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    width: 28rem;
    max-width: 90vw;
    background: white;
    border-right: 1px solid #e5e7eb;
    box-shadow: 4px 0 20px rgba(0,0,0,0.15);
    z-index: 100;
    transform: translateX(-100%);
    transition: transform 0.25s ease-out;
    display: flex;
    flex-direction: column;
    overflow: hidden;
}

.kn-article-panel.open {
    transform: translateX(0);
}

.kn-article-modal {
    display: flex;
    flex-direction: column;
    height: 100%;
    overflow: hidden;
}

@media (max-width: 640px) {
    .kn-article-panel {
        width: 100%;
        max-width: 100%;
    }
}

/* === TAG VARIANTS (author, journal) === */
.kn-tag.author { background: #dcfce7; color: #166534; border: 1px solid #bbf7d0; }
.kn-tag.author:hover { background: #bbf7d0; }
.kn-tag.journal { background: #fef9c3; color: #854d0e; border: 1px solid #fef08a; }
.kn-tag.journal:hover { background: #fef08a; }

.kn-panel-header {
    padding: 0.75rem 1rem;
    background: #f9fafb;
    border-bottom: 1px solid #e5e7eb;
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    flex-shrink: 0;
}

.kn-panel-body {
    flex: 1;
    overflow-y: auto;
    padding: 0.75rem;
}

.kn-panel-section {
    margin-bottom: 0.75rem;
    overflow: visible;
}

/* Extra padding for MeSH section to show hover actions */
.kn-panel-section .flex.flex-wrap.gap-1 {
    padding-bottom: 1.5rem;
}

.kn-panel-section-title {
    font-size: 0.6875rem;
    font-weight: 700;
    color: #6b7280;
    text-transform: uppercase;
    margin-bottom: 0.375rem;
    padding-bottom: 0.25rem;
    border-bottom: 1px solid #f3f4f6;
}

/* === PAGINATION === */
.kn-pagination {
    display: flex;
    align-items: center;
    justify-content: center;
    gap: 0.25rem;
    padding: 0.75rem 1rem;
    border-top: 1px solid #e5e7eb;
    background: #f9fafb;
}

.kn-page-btn {
    padding: 0.25rem 0.5rem;
    font-size: 0.6875rem;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    background: white;
    color: #374151;
    cursor: pointer;
    transition: all 0.15s;
}

.kn-page-btn:hover {
    background: #eff6ff;
    border-color: #93c5fd;
}

.kn-page-btn.active {
    background: #2563eb;
    color: white;
    border-color: #2563eb;
}

.kn-page-btn:disabled {
    opacity: 0.4;
    cursor: not-allowed;
}

/* === LOADING STATES === */
.kn-loading {
    display: flex;
    align-items: center;
    justify-content: center;
    padding: 2rem;
    color: #6b7280;
    font-size: 0.8125rem;
    gap: 0.5rem;
}

.kn-empty-state {
    display: flex;
    flex-direction: column;
    align-items: center;
    justify-content: center;
    padding: 3rem 1rem;
    color: #9ca3af;
    text-align: center;
}

.kn-empty-state i {
    font-size: 2rem;
    margin-bottom: 0.75rem;
}

.kn-empty-state p {
    font-size: 0.8125rem;
}

/* === UTILITY === */
.kn-divider {
    color: #d1d5db;
    font-size: 0.625rem;
}

.kn-btn-close {
    background: none;
    border: none;
    color: #9ca3af;
    cursor: pointer;
    padding: 0.25rem;
    transition: color 0.15s;
    font-size: 0.875rem;
}

.kn-btn-close:hover {
    color: #374151;
}

.kn-btn-copy {
    background: #2563eb;
    color: white;
    border: none;
    border-radius: 0.375rem;
    padding: 0.375rem 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: background 0.15s;
}

.kn-btn-copy:hover {
    background: #1d4ed8;
}

.kn-btn-secondary {
    background: #f3f4f6;
    color: #374151;
    border: 1px solid #d1d5db;
    border-radius: 0.375rem;
    padding: 0.375rem 1rem;
    font-size: 0.75rem;
    font-weight: 500;
    cursor: pointer;
    transition: all 0.15s;
}

.kn-btn-secondary:hover {
    background: #e5e7eb;
}