/* ═══════════════════════════════════════════════════════
   Knowledge Base — Redesigned UI
   ═══════════════════════════════════════════════════════ */

/* ─── Shared Components ─── */

.kb-loading {
    display: flex;
    align-items: center;
    gap: 10px;
    justify-content: center;
    padding: 48px 0;
    color: var(--color-text-secondary, #6b7280);
    font-size: var(--font-size-sm);
}

.kb-btn {
    display: inline-flex;
    align-items: center;
    gap: 6px;
    padding: 8px 16px;
    font-size: var(--font-size-sm);
    font-weight: 600;
    border-radius: var(--radius-md);
    cursor: pointer;
    border: none;
    transition: all var(--transition-fast);
    font-family: inherit;
    line-height: 1.4;
    white-space: nowrap;
}
.kb-btn:disabled {
    opacity: 0.6;
    cursor: default;
}
.kb-btn--primary {
    background: var(--color-primary, #1a56db);
    color: #fff;
}
.kb-btn--primary:hover:not(:disabled) {
    background: var(--color-primary-hover, #1648b8);
    transform: translateY(-1px);
    box-shadow: 0 2px 8px rgba(26, 86, 219, 0.3);
}
.kb-btn--secondary {
    background: var(--color-surface, #fff);
    color: var(--color-text, #111827);
    border: 1px solid var(--color-border, #d1d5db);
}
.kb-btn--secondary:hover:not(:disabled) {
    background: #f9fafb;
    border-color: #9ca3af;
}
.kb-btn--ghost {
    background: none;
    color: var(--color-text-secondary, #6b7280);
    padding: 6px 12px;
}
.kb-btn--ghost:hover {
    color: var(--color-text);
    background: #f3f4f6;
}
.kb-btn--danger {
    background: none;
    color: var(--color-danger, #dc2626);
    border: 1px solid #fca5a5;
}
.kb-btn--danger:hover:not(:disabled) {
    background: #fef2f2;
}
.kb-btn--lg {
    padding: 10px 20px;
    font-size: var(--font-size-sm);
}
.kb-btn--sm {
    padding: 5px 10px;
    font-size: var(--font-size-xs);
}

.kb-btn-spinner {
    display: inline-block;
    width: 14px;
    height: 14px;
    border: 2px solid rgba(255,255,255,0.3);
    border-top-color: #fff;
    border-radius: 50%;
    animation: kbSpin 0.6s linear infinite;
}
.kb-btn--secondary .kb-btn-spinner,
.kb-btn--ghost .kb-btn-spinner {
    border-color: rgba(0,0,0,0.15);
    border-top-color: var(--color-primary);
}
@keyframes kbSpin {
    to { transform: rotate(360deg); }
}

/* ─── Empty State ─── */
.kb-empty {
    text-align: center;
    padding: 48px 24px;
}
.kb-empty--inline {
    padding: 32px 16px;
}
.kb-empty__icon {
    color: var(--color-text-muted, #9ca3af);
    margin-bottom: 12px;
}
.kb-empty__title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}
.kb-empty__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.6;
    max-width: 420px;
    margin: 0 auto;
}

/* ─── Form Components ─── */
.kb-form-group {
    margin-bottom: 16px;
}
.kb-label {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin-bottom: 6px;
}
.kb-label__hint {
    display: block;
    font-size: var(--font-size-xs);
    font-weight: 400;
    color: var(--color-text-muted, #9ca3af);
    margin-top: 2px;
}
.kb-input {
    width: 100%;
    padding: 10px 14px;
    font-size: var(--font-size-sm);
    border: 1px solid var(--color-border, #d1d5db);
    border-radius: var(--radius-md);
    background: var(--color-surface, #fff);
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.kb-input:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}
.kb-textarea {
    width: 100%;
    padding: 12px 14px;
    font-size: var(--font-size-sm);
    border: 1px solid var(--color-border, #d1d5db);
    border-radius: var(--radius-md);
    background: var(--color-surface, #fff);
    font-family: inherit;
    line-height: 1.6;
    resize: vertical;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.kb-textarea:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}
.kb-textarea--editor {
    min-height: 300px;
    font-family: 'JetBrains Mono', 'Fira Code', 'Consolas', monospace;
}

.kb-textarea-footer {
    display: flex;
    justify-content: space-between;
    margin-top: 6px;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}
.kb-char-count--ok {
    color: var(--color-success);
}
.kb-hint {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    margin-top: 4px;
}
.kb-hint-inline {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}

/* ─── Info Box ─── */
.kb-info-box {
    display: flex;
    gap: 12px;
    padding: 14px 16px;
    background: var(--color-primary-light, #e1effe);
    border-radius: var(--radius-md);
    border: 1px solid rgba(26, 86, 219, 0.15);
}
.kb-info-box__icon {
    color: var(--color-primary);
    flex-shrink: 0;
    margin-top: 2px;
}
.kb-info-box strong {
    display: block;
    font-size: var(--font-size-sm);
    margin-bottom: 4px;
    color: var(--color-text);
}
.kb-info-box p {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin: 0;
}

/* ─── Badges ─── */
.kb-badge {
    display: inline-flex;
    align-items: center;
    gap: 4px;
    padding: 3px 10px;
    border-radius: var(--radius-full);
    font-size: 0.6875rem;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.03em;
}
.kb-badge--pdf {
    background: #fef3c7;
    color: #92400e;
}
.kb-badge--manual {
    background: #dbeafe;
    color: #1e40af;
}
.kb-badge--correction {
    background: #d1fae5;
    color: #065f46;
}

/* ─── Toggle ─── */
.kb-toggle {
    display: inline-flex;
    align-items: center;
    gap: 8px;
    cursor: pointer;
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}
.kb-toggle input { display: none; }
.kb-toggle__track {
    position: relative;
    width: 36px;
    height: 20px;
    background: #d1d5db;
    border-radius: 20px;
    transition: background var(--transition-fast);
}
.kb-toggle__track::after {
    content: '';
    position: absolute;
    width: 16px;
    height: 16px;
    left: 2px;
    top: 2px;
    background: #fff;
    border-radius: 50%;
    transition: transform var(--transition-fast);
    box-shadow: 0 1px 3px rgba(0,0,0,0.15);
}
.kb-toggle input:checked + .kb-toggle__track {
    background: var(--color-success, #0e9f6e);
}
.kb-toggle input:checked + .kb-toggle__track::after {
    transform: translateX(16px);
}
.kb-toggle__label {
    font-weight: 500;
}

/* ─── Search & Filter ─── */
.kb-search-wrap {
    position: relative;
    flex: 1;
    min-width: 200px;
}
.kb-search-wrap > svg {
    position: absolute;
    left: 12px;
    top: 50%;
    transform: translateY(-50%);
    color: var(--color-text-muted);
    pointer-events: none;
}
.kb-search {
    width: 100%;
    padding: 10px 14px 10px 36px;
    font-size: var(--font-size-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    font-family: inherit;
    transition: border-color var(--transition-fast), box-shadow var(--transition-fast);
}
.kb-search:focus {
    outline: none;
    border-color: var(--color-primary);
    box-shadow: 0 0 0 3px rgba(26, 86, 219, 0.1);
}
.kb-filter-select {
    padding: 10px 14px;
    font-size: var(--font-size-sm);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    background: var(--color-surface);
    cursor: pointer;
    min-width: 180px;
    font-family: inherit;
}

/* ─── Stats ─── */
.kb-stats {
    display: flex;
    gap: 12px;
    margin-bottom: 20px;
    flex-wrap: wrap;
}
.kb-stat {
    display: flex;
    flex-direction: column;
    align-items: center;
    padding: 14px 22px;
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    min-width: 100px;
    box-shadow: var(--shadow-sm);
}
.kb-stat--success {
    border-color: rgba(14, 159, 110, 0.2);
    background: rgba(14, 159, 110, 0.04);
}
.kb-stat__value {
    font-size: 1.5rem;
    font-weight: 700;
    line-height: 1;
    color: var(--color-text);
}
.kb-stat--success .kb-stat__value {
    color: var(--color-success);
}
.kb-stat__label {
    font-size: 0.6875rem;
    color: var(--color-text-secondary);
    margin-top: 4px;
    text-transform: uppercase;
    letter-spacing: 0.05em;
    font-weight: 600;
}

/* ─── Progress ─── */
.kb-progress {
    width: 100%;
    height: 4px;
    background: #e5e7eb;
    border-radius: 2px;
    overflow: hidden;
    margin: 10px 0 12px;
}
.kb-progress__bar {
    height: 100%;
    background: var(--color-success, #0e9f6e);
    border-radius: 2px;
    transition: width 0.4s ease;
}
.kb-progress--empty .kb-progress__bar {
    background: #d1d5db;
}


/* ═══════════════════════════════════════════════════════
   Knowledge Page — Hero & Layout
   ═══════════════════════════════════════════════════════ */

.kb-page {
    width: 100%;
    max-width: 100%;
    overflow: hidden;
}

.kb-hero {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    gap: 20px;
    margin-bottom: 24px;
    padding-bottom: 20px;
    border-bottom: 1px solid var(--color-border);
}
.kb-hero__title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--font-size-xl);
    font-weight: 700;
    color: var(--color-text);
    margin: 0;
}
.kb-hero__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 6px 0 0;
    line-height: 1.5;
    max-width: 480px;
}
.kb-hero__actions {
    display: flex;
    gap: 8px;
    flex-shrink: 0;
}

.kb-back-bar {
    margin-bottom: 16px;
}

/* ─── Toolbar ─── */
.kb-toolbar {
    display: flex;
    gap: 12px;
    margin-bottom: 16px;
    flex-wrap: wrap;
}

/* ─── Document Cards Grid ─── */
.kb-doc-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
    gap: 16px;
    width: 100%;
}

.kb-doc-card {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 16px;
    transition: box-shadow var(--transition-fast), border-color var(--transition-fast);
}
.kb-doc-card:hover {
    box-shadow: var(--shadow-md);
    border-color: #9ca3af;
}
.kb-doc-card--inactive {
    opacity: 0.55;
}
.kb-doc-card--inactive:hover {
    opacity: 0.75;
}
.kb-doc-card__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 10px;
}
.kb-doc-card__title {
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 8px;
    line-height: 1.4;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 2;
    -webkit-box-orient: vertical;
}
.kb-doc-card__meta {
    display: flex;
    gap: 16px;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}
.kb-doc-card__meta span {
    display: inline-flex;
    align-items: center;
    gap: 4px;
}
.kb-doc-card__actions {
    display: flex;
    gap: 6px;
    margin-top: 4px;
}

/* ─── Modal ─── */
.kb-modal-overlay {
    position: fixed;
    inset: 0;
    background: rgba(0, 0, 0, 0.5);
    z-index: 1000;
    display: flex;
    align-items: center;
    justify-content: center;
    backdrop-filter: blur(4px);
}
.kb-modal {
    background: var(--color-surface);
    border-radius: 16px;
    width: 90%;
    max-width: 640px;
    max-height: 90vh;
    overflow-y: auto;
    box-shadow: 0 20px 60px rgba(0, 0, 0, 0.2);
    animation: kbModalIn 0.2s ease-out;
}
.kb-modal--lg {
    max-width: 720px;
}
@keyframes kbModalIn {
    from { transform: translateY(20px); opacity: 0; }
    to { transform: translateY(0); opacity: 1; }
}
.kb-modal__header {
    display: flex;
    justify-content: space-between;
    align-items: flex-start;
    padding: 20px 24px 16px;
    border-bottom: 1px solid var(--color-border);
}
.kb-modal__title {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0;
    color: var(--color-text);
}
.kb-modal__subtitle {
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    margin: 4px 0 0;
}
.kb-modal__close {
    background: none;
    border: none;
    cursor: pointer;
    color: var(--color-text-muted);
    padding: 4px;
    border-radius: var(--radius-sm);
    transition: color var(--transition-fast), background var(--transition-fast);
    flex-shrink: 0;
}
.kb-modal__close:hover {
    color: var(--color-text);
    background: #f3f4f6;
}
.kb-modal__body {
    padding: 20px 24px;
}
.kb-modal__footer {
    display: flex;
    justify-content: flex-end;
    gap: 10px;
    padding: 16px 24px;
    border-top: 1px solid var(--color-border);
}

/* ─── Upload Card ─── */
.kb-upload-card {
    max-width: 640px;
    margin: 0 auto;
}
.kb-upload-card__header {
    margin-bottom: 20px;
}
.kb-upload-card__header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--font-size-lg);
    font-weight: 700;
    margin: 0 0 6px;
}
.kb-upload-card__header p {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
    line-height: 1.5;
}

.kb-upload-zone {
    border: 2px dashed var(--color-border);
    border-radius: var(--radius-lg);
    padding: 48px 24px;
    text-align: center;
    cursor: pointer;
    transition: border-color var(--transition-fast), background var(--transition-fast);
}
.kb-upload-zone:hover,
.kb-upload-zone--dragover {
    border-color: var(--color-primary);
    background: var(--color-primary-light);
}
.kb-upload-zone__icon {
    color: var(--color-text-muted);
    margin-bottom: 12px;
}
.kb-upload-zone__title {
    font-size: var(--font-size-md);
    font-weight: 600;
    color: var(--color-text);
    margin: 0 0 4px;
}
.kb-upload-zone__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    margin: 0;
}
.kb-upload-zone__desc strong {
    color: var(--color-primary);
}
.kb-upload-zone__limit {
    display: inline-block;
    margin-top: 12px;
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
    background: #f3f4f6;
    padding: 3px 10px;
    border-radius: var(--radius-full);
}

/* Upload Selected */
.kb-upload-selected {
    margin-top: 16px;
}
.kb-upload-file {
    display: flex;
    align-items: center;
    gap: 12px;
    padding: 12px 16px;
    background: #f9fafb;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    margin-bottom: 16px;
}
.kb-upload-file__icon {
    color: #b45309;
    flex-shrink: 0;
}
.kb-upload-file__info {
    flex: 1;
}
.kb-upload-file__name {
    display: block;
    font-size: var(--font-size-sm);
    font-weight: 600;
    color: var(--color-text);
}
.kb-upload-file__size {
    font-size: var(--font-size-xs);
    color: var(--color-text-muted);
}
.kb-upload-progress {
    margin: 16px 0;
}
.kb-upload-progress__bar {
    width: 100%;
    height: 6px;
    background: #e5e7eb;
    border-radius: 3px;
    overflow: hidden;
}
.kb-upload-progress__fill {
    height: 100%;
    background: var(--color-primary);
    border-radius: 3px;
    transition: width 0.3s ease;
}
.kb-upload-progress__text {
    display: block;
    margin-top: 6px;
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
    text-align: center;
}
.kb-upload-actions {
    margin-top: 16px;
    text-align: center;
}

/* Upload Success */
.kb-upload-success {
    text-align: center;
    padding: 32px 16px;
}
.kb-upload-success__icon {
    color: var(--color-success);
    margin-bottom: 12px;
}
.kb-upload-success__title {
    font-size: var(--font-size-lg);
    font-weight: 700;
    color: var(--color-text);
    margin: 0 0 8px;
}
.kb-upload-success__desc {
    font-size: var(--font-size-sm);
    color: var(--color-text-secondary);
    line-height: 1.5;
    margin: 0 0 20px;
    max-width: 400px;
    margin-left: auto;
    margin-right: auto;
}

/* ─── Editor ─── */
.kb-editor {
    display: flex;
    flex-direction: column;
    gap: 16px;
    max-width: 960px;
}
.kb-editor__topbar {
    display: flex;
    justify-content: space-between;
    align-items: center;
}
.kb-editor__form {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
}
.kb-editor__actions {
    display: flex;
    gap: 10px;
    margin-top: 4px;
}
.kb-editor__chunks {
    background: var(--color-surface);
    border: 1px solid var(--color-border);
    border-radius: var(--radius-lg);
    padding: 20px;
}
.kb-editor__chunks-header {
    margin-bottom: 16px;
}
.kb-editor__chunks-header h3 {
    display: flex;
    align-items: center;
    gap: 8px;
    font-size: var(--font-size-md);
    font-weight: 600;
    margin: 0 0 4px;
}

/* Chunk Grid */
.kb-chunk-grid {
    display: grid;
    grid-template-columns: repeat(auto-fill, minmax(260px, 1fr));
    gap: 12px;
}
.kb-chunk {
    background: #f9fafb;
    border: 1px solid var(--color-border);
    border-radius: var(--radius-md);
    padding: 12px;
}
.kb-chunk--ready {
    border-left: 3px solid var(--color-success);
}
.kb-chunk__header {
    display: flex;
    justify-content: space-between;
    align-items: center;
    margin-bottom: 8px;
    font-size: var(--font-size-xs);
    color: var(--color-text-secondary);
}
.kb-chunk__index {
    font-weight: 700;
}
.kb-chunk__meta {
    display: flex;
    align-items: center;
    gap: 4px;
    background: #e5e7eb;
    padding: 2px 8px;
    border-radius: var(--radius-sm);
}
.kb-chunk__content {
    font-size: 0.8125rem;
    line-height: 1.5;
    color: var(--color-text);
    max-height: 100px;
    overflow: hidden;
    position: relative;
}
.kb-chunk__content::after {
    content: '';
    position: absolute;
    bottom: 0;
    left: 0;
    right: 0;
    height: 24px;
    background: linear-gradient(transparent, #f9fafb);
}
.kb-chunk--ready .kb-chunk__content::after {
    background: linear-gradient(transparent, #f9fafb);
}

/* ═══════════════════════════════════════════════════════
   Responsive
   ═══════════════════════════════════════════════════════ */

@media (max-width: 768px) {
    .kb-hero {
        flex-direction: column;
    }
    .kb-hero__actions {
        width: 100%;
    }
    .kb-hero__actions .kb-btn {
        flex: 1;
        justify-content: center;
    }
    .kb-toolbar {
        flex-direction: column;
    }
    .kb-filter-select {
        min-width: 100%;
    }
    .kb-doc-grid {
        grid-template-columns: 1fr;
    }
    .kb-modal {
        width: 95%;
        max-height: 95vh;
    }
    .kb-stats {
        gap: 8px;
    }
    .kb-stat {
        flex: 1;
        min-width: 80px;
        padding: 10px 14px;
    }
    .kb-chunk-grid {
        grid-template-columns: 1fr;
    }
}