/**
 * Knowledge Base — article composer
 *
 * The full-screen writing desk. Three zones: a navy command bar, a document
 * canvas that behaves like a sheet of paper, and a side rail for metadata.
 * The canvas and the rail scroll independently — html/body are locked to
 * overflow: hidden in base.css, so every overlay carries its own scrolling.
 *
 * .kbcomp-* namespace. The preview inside the canvas deliberately reuses the
 * reader's classes (.kbase-reader-*, .kbase-block-*) instead of restyling
 * anything, so the preview cannot drift from the published article.
 */

/* ========================================
   SHELL
   ======================================== */

.kbcomp-overlay {
  position: fixed;
  inset: 0;
  z-index: var(--z-modal);
  background: var(--color-primary-deep);
  opacity: 0;
  transition: opacity var(--duration-200) var(--ease-in-out);
}

.kbcomp-overlay.is-open {
  opacity: 1;
}

.kbcomp {
  display: flex;
  flex-direction: column;
  height: 100%;
  background: var(--color-background);
}

/* ========================================
   COMMAND BAR
   ======================================== */

.kbcomp-bar {
  flex-shrink: 0;
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-4);
  padding: var(--spacing-3) var(--spacing-5);
  background: var(--gradient-navy-surface);
  color: var(--color-white);
  box-shadow: var(--shadow-navy-raised);
}

.kbcomp-bar-left {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
  min-width: 0;
}

.kbcomp-close {
  flex-shrink: 0;
  width: var(--spacing-11);
  height: var(--spacing-11);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border: 1px solid rgba(255, 255, 255, 0.2);
  border-radius: var(--radius-full);
  background: rgba(255, 255, 255, 0.08);
  color: var(--color-white);
  cursor: pointer;
  transition: var(--transition-colors);
}

.kbcomp-close:hover {
  background: rgba(255, 255, 255, 0.18);
}

.kbcomp-close:focus-visible,
.kbcomp-preview-toggle:focus-visible {
  outline: 2px solid var(--color-white);
  outline-offset: 2px;
}

.kbcomp-bar-text {
  display: flex;
  flex-direction: column;
  min-width: 0;
}

.kbcomp-eyebrow {
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-widest);
  text-transform: uppercase;
  color: rgba(255, 255, 255, 0.6);
}

.kbcomp-bar-title {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-md);
  font-weight: var(--font-weight-bold);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kbcomp-bar-actions {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.kbcomp-preview-toggle {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  min-height: var(--spacing-9);
  padding: 0 var(--spacing-4);
  border: 1px solid rgba(255, 255, 255, 0.28);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-white);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-colors);
}

.kbcomp-preview-toggle:hover {
  background: rgba(255, 255, 255, 0.12);
}

.kbcomp-preview-toggle.is-active {
  background: var(--color-white);
  border-color: var(--color-white);
  color: var(--color-primary);
}

/* The ghost variant is styled for light surfaces and would vanish on navy. */
.kbcomp-bar-actions .btn-ghost {
  color: rgba(255, 255, 255, 0.85);
}

.kbcomp-bar-actions .btn-ghost:hover {
  background-color: rgba(255, 255, 255, 0.12);
  color: var(--color-white);
}

.kbcomp-bar-actions .btn.is-busy {
  opacity: 0.7;
  cursor: progress;
}

/* ========================================
   ERROR STRIP
   ======================================== */

.kbcomp-error {
  flex-shrink: 0;
  margin: 0;
  padding: var(--spacing-3) var(--spacing-5);
  background: var(--color-error-light);
  color: var(--color-error-dark);
  border-bottom: 1px solid var(--color-error);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-medium);
}

/* ========================================
   BODY LAYOUT
   ======================================== */

.kbcomp-body {
  flex: 1;
  min-height: 0;
  display: grid;
  grid-template-columns: minmax(0, 1fr) 320px;
}

.kbcomp-canvas {
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--spacing-8) var(--spacing-6) var(--spacing-16);
}

.kbcomp-sheet,
.kbcomp-preview {
  width: 100%;
  max-width: var(--narrow-max-width);
  margin: 0 auto;
}

/* The hidden attribute is a UA rule and loses against any class that sets
   display, so every element toggled through it needs this line. */
.kbcomp-sheet[hidden],
.kbcomp-preview-image[hidden] {
  display: none;
}

.kbcomp-sheet {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-4);
  padding: var(--spacing-8);
  border-radius: var(--radius-2xl);
  background: var(--color-surface);
  box-shadow: var(--shadow-xl);
}

/* ========================================
   TITLE & LEDE
   ======================================== */

.kbcomp-title-field,
.kbcomp-summary-field {
  width: 100%;
  border: 0;
  padding: 0;
  background: transparent;
  resize: none;
  overflow: hidden;
}

/* base.css rings every focused field. On the sheet the caret is the focus
   indicator; a ring around the headline would make the page look like a form. */
.kbcomp-title-field:focus,
.kbcomp-summary-field:focus {
  outline: none;
  box-shadow: none;
}

.kbcomp-title-field {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-2xl);
  font-weight: var(--font-weight-bold);
  line-height: var(--line-height-tight);
  letter-spacing: var(--letter-spacing-tight);
  color: var(--color-text-primary);
}

.kbcomp-summary-field {
  padding-bottom: var(--spacing-4);
  border-bottom: 1px solid var(--color-border-light);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-md);
  color: var(--color-text-secondary);
  line-height: var(--line-height-relaxed);
}

.kbcomp-title-field::placeholder,
.kbcomp-summary-field::placeholder {
  color: var(--color-text-muted);
}

/* ========================================
   BLOCK CARDS
   ======================================== */

.kbcomp-blocks {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.kbcomp-block {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  padding: var(--spacing-3) var(--spacing-4) var(--spacing-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: var(--color-off-white);
  transition:
    border-color var(--duration-200) var(--ease-in-out),
    box-shadow var(--duration-200) var(--ease-in-out),
    background-color var(--duration-200) var(--ease-in-out);
}

.kbcomp-block:focus-within {
  border-color: var(--color-primary-300);
  background: var(--color-surface);
  box-shadow: var(--shadow-md);
}

.kbcomp-block.is-invalid {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(220, 38, 38, 0.12);
}

.kbcomp-block-bar {
  display: flex;
  align-items: center;
  gap: var(--spacing-3);
}

.kbcomp-block-kind {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  color: var(--color-primary);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wide);
  text-transform: uppercase;
}

.kbcomp-block-no {
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-2xs);
  color: var(--color-text-muted);
}

.kbcomp-block-tools {
  display: flex;
  gap: var(--spacing-1);
  margin-left: auto;
}

.kbcomp-block-fields {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2-5);
}

/* Present at all times, quiet until the block is worked on — a hover-only
   affordance would be invisible to keyboard and touch. */
.kbcomp-block-foot {
  display: flex;
  justify-content: center;
  padding-bottom: var(--spacing-2);
}

.kbcomp-block-foot .kbcomp-ghost-btn {
  min-height: var(--spacing-7);
  padding: 0 var(--spacing-2-5);
  font-size: var(--font-size-2xs);
  opacity: 0.5;
  transition: opacity var(--duration-150) var(--ease-in-out), var(--transition-colors);
}

.kbcomp-block:hover .kbcomp-block-foot .kbcomp-ghost-btn,
.kbcomp-block:focus-within .kbcomp-block-foot .kbcomp-ghost-btn {
  opacity: 1;
}

/* ========================================
   TOOLS & GHOST BUTTONS
   ======================================== */

.kbcomp-tool {
  width: var(--spacing-9);
  height: var(--spacing-9);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  flex-shrink: 0;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-slate-500);
  cursor: pointer;
  transition: var(--transition-colors);
}

.kbcomp-tool:hover:not(:disabled) {
  border-color: var(--color-border);
  background: var(--color-surface);
  color: var(--color-primary);
}

.kbcomp-tool:disabled {
  opacity: 0.35;
  cursor: not-allowed;
}

.kbcomp-tool:focus-visible,
.kbcomp-ghost-btn:focus-visible,
.kbcomp-palette-card:focus-visible,
.kbcomp-segment:focus-visible {
  outline: 2px solid var(--color-secondary);
  outline-offset: 2px;
}

.kbcomp-ghost-btn {
  display: inline-flex;
  align-items: center;
  gap: var(--spacing-2);
  min-height: var(--spacing-9);
  padding: 0 var(--spacing-3);
  border: 1px dashed var(--color-gray-300);
  border-radius: var(--radius-md);
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-colors);
}

.kbcomp-ghost-btn:hover {
  border-color: var(--color-primary-300);
  color: var(--color-primary);
  background: var(--color-primary-50);
}

/* Fine-grained tools are fine with a mouse; a finger needs the full target. */
@media (pointer: coarse) {
  .kbcomp-tool,
  .kbcomp-ghost-btn {
    min-height: var(--spacing-11);
    min-width: var(--spacing-11);
  }
}

/* ========================================
   FIELDS
   ======================================== */

.kbcomp-field {
  width: 100%;
  padding: var(--spacing-2-5) var(--spacing-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  color: var(--color-text-primary);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-sm);
  line-height: var(--line-height-normal);
  transition: var(--transition-colors), box-shadow var(--duration-150) var(--ease-in-out);
}

.kbcomp-field:focus {
  outline: none;
  border-color: var(--color-secondary);
  box-shadow: var(--glow-focus);
}

.kbcomp-field::placeholder {
  color: var(--color-text-muted);
}

.kbcomp-field--area {
  resize: none;
  overflow: hidden;
  min-height: var(--spacing-16);
}

.kbcomp-field--title {
  font-size: var(--font-size-base);
  font-weight: var(--font-weight-semibold);
}

.kbcomp-field--quote {
  font-family: var(--font-family-primary);
  font-size: var(--font-size-base);
  font-style: italic;
}

.kbcomp-labelled {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1-5);
}

.kbcomp-field-label {
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  color: var(--color-slate-text-muted);
}

.kbcomp-field-hint {
  margin: 0;
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-xs);
  color: var(--color-slate-text-muted);
}

.kbcomp-preview-image {
  display: block;
  width: 100%;
  max-height: 200px;
  object-fit: cover;
  border-radius: var(--radius-md);
  border: 1px solid var(--color-border);
}

/* ========================================
   SEGMENTED CONTROL
   ======================================== */

.kbcomp-segmented {
  display: inline-flex;
  gap: var(--spacing-1);
  padding: var(--spacing-1);
  border-radius: var(--radius-md);
  background: var(--color-gray-100);
  align-self: flex-start;
  flex-wrap: wrap;
}

.kbcomp-segment {
  min-height: var(--spacing-8);
  padding: 0 var(--spacing-3);
  border: 0;
  border-radius: var(--radius-sm);
  background: transparent;
  color: var(--color-text-secondary);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-xs);
  font-weight: var(--font-weight-medium);
  cursor: pointer;
  transition: var(--transition-colors);
}

.kbcomp-segment:hover {
  color: var(--color-primary);
}

.kbcomp-segment.is-active {
  background: var(--color-surface);
  color: var(--color-primary);
  font-weight: var(--font-weight-semibold);
  box-shadow: var(--shadow-xs);
}

/* ========================================
   ITEM ROWS (list points, process steps)
   ======================================== */

.kbcomp-items {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

.kbcomp-item {
  display: flex;
  align-items: center;
  gap: var(--spacing-2);
}

.kbcomp-item--step {
  align-items: flex-start;
}

.kbcomp-item-index {
  flex-shrink: 0;
  width: var(--spacing-6);
  height: var(--spacing-6);
  display: inline-flex;
  align-items: center;
  justify-content: center;
  border-radius: var(--radius-full);
  background: var(--color-primary-50);
  color: var(--color-primary);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-bold);
}

.kbcomp-item--step .kbcomp-item-index {
  margin-top: var(--spacing-2);
}

.kbcomp-item-body {
  flex: 1;
  min-width: 0;
  display: flex;
  flex-direction: column;
  gap: var(--spacing-2);
}

/* ========================================
   INSERT PALETTE
   ======================================== */

.kbcomp-palette {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
  padding: var(--spacing-4);
  border: 1px dashed var(--color-gray-300);
  border-radius: var(--radius-lg);
  background: var(--color-light-gray);
}

.kbcomp-palette.is-inline {
  border-color: var(--color-secondary);
  background: var(--portal-tint-blue);
}

.kbcomp-palette-head {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--spacing-2);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-2xs);
  font-weight: var(--font-weight-semibold);
  letter-spacing: var(--letter-spacing-wider);
  text-transform: uppercase;
  color: var(--color-slate-text-muted);
}

.kbcomp-palette-grid {
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
  gap: var(--spacing-2);
}

.kbcomp-palette-card {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-1);
  padding: var(--spacing-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  text-align: left;
  cursor: pointer;
  transition:
    transform var(--duration-150) var(--ease-out),
    border-color var(--duration-150) var(--ease-in-out),
    box-shadow var(--duration-150) var(--ease-in-out);
}

.kbcomp-palette-card:hover {
  transform: translateY(-2px);
  border-color: var(--color-primary-300);
  box-shadow: var(--shadow-md);
}

.kbcomp-palette-icon {
  display: inline-flex;
  color: var(--color-secondary);
}

.kbcomp-palette-label {
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-semibold);
  color: var(--color-text-primary);
}

.kbcomp-palette-hint {
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-2xs);
  color: var(--color-slate-text-muted);
  line-height: var(--line-height-snug);
}

/* ========================================
   SIDE RAIL
   ======================================== */

.kbcomp-rail {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-6);
  padding: var(--spacing-6) var(--spacing-5);
  border-left: 1px solid var(--color-border);
  background: var(--color-surface);
  overflow-y: auto;
  overscroll-behavior: contain;
}

.kbcomp-rail-group {
  display: flex;
  flex-direction: column;
  gap: var(--spacing-3);
}

.kbcomp-rail-title {
  margin: 0;
  font-family: var(--font-family-primary);
  font-size: var(--font-size-sm);
  font-weight: var(--font-weight-bold);
  color: var(--color-text-primary);
  padding-bottom: var(--spacing-2);
  border-bottom: 1px solid var(--color-border-light);
}

.kbcomp-checkline {
  display: flex;
  align-items: center;
  gap: var(--spacing-2-5);
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-sm);
  color: var(--color-gray-700);
  cursor: pointer;
}

.kbcomp-checkbox {
  width: var(--spacing-4);
  height: var(--spacing-4);
  accent-color: var(--color-primary);
}

.kbcomp-rail-foot {
  margin-top: auto;
  padding-top: var(--spacing-4);
  border-top: 1px solid var(--color-border-light);
}

.kbcomp-rail-count {
  font-family: var(--font-family-secondary);
  font-size: var(--font-size-xs);
  color: var(--color-slate-text-muted);
}

/* ========================================
   PREVIEW
   ======================================== */

.kbcomp-preview .kbase-reader-article {
  box-shadow: var(--shadow-xl);
}

/* ========================================
   RESPONSIVE
   ======================================== */

@media (max-width: 900px) {
  /* One column: the body itself scrolls, the two panes no longer do. */
  .kbcomp-body {
    grid-template-columns: 1fr;
    overflow-y: auto;
    overscroll-behavior: contain;
  }

  .kbcomp-canvas,
  .kbcomp-rail {
    overflow: visible;
  }

  .kbcomp-rail {
    border-left: 0;
    border-top: 1px solid var(--color-border);
  }
}

@media (max-width: 600px) {
  .kbcomp-bar {
    flex-wrap: wrap;
    gap: var(--spacing-2);
  }

  /* Three actions do not fit one narrow row; wrapping beats clipping the
     primary action off the screen edge. */
  .kbcomp-bar-actions {
    width: 100%;
    flex-wrap: wrap;
    justify-content: flex-end;
  }

  .kbcomp-bar-actions .btn {
    flex: 1 1 auto;
    justify-content: center;
  }

  .kbcomp-canvas {
    padding: var(--spacing-4) var(--spacing-3) var(--spacing-12);
  }

  .kbcomp-sheet {
    padding: var(--spacing-5) var(--spacing-4);
  }

  .kbcomp-preview-toggle {
    padding: 0 var(--spacing-3);
  }
}

@media (prefers-reduced-motion: reduce) {
  .kbcomp-palette-card:hover {
    transform: none;
  }
}

/* ========================================
   FEINSCHLIFF
   ======================================== */

/* Block and word counters keep their width while typing. */
.kbcomp-block-no,
.kbcomp-rail-count,
.kbcomp-item-index {
  font-variant-numeric: tabular-nums;
}

/* Palette cards settle on press instead of floating under the pointer. */
.kbcomp-palette-card:active {
  transform: translateY(0);
  box-shadow: var(--shadow-xs);
}

/* The headline field balances its own line breaks while writing. */
.kbcomp-title-field {
  text-wrap: balance;
}