/*
 * DnD Transcriber - Web UI Styles
 * Design: Dark mode with cyan/teal accents for D&D session transcription
 */

/* ==========================================
   CSS CUSTOM PROPERTIES (Design Tokens)
   ========================================== */

:root {
  /* Colors - Background */
  --color-bg-primary: #0a0a0c;
  --color-bg-secondary: #111114;
  --color-bg-tertiary: #18181c;

  /* Colors - Surface */
  --color-surface: #1c1c22;
  --color-surface-elevated: #252530;
  --color-surface-sunken: #0d0d0f;

  /* Colors - Text */
  --color-text-primary: #f4f4f5;
  --color-text-secondary: #a1a1aa;
  --color-text-tertiary: #71717a;
  --color-text-inverse: #0a0a0c;

  /* Colors - Accent */
  --color-accent: #14b8a6;
  --color-accent-hover: #0d9488;
  --color-accent-secondary: #06b6d4;
  --color-accent-glow: rgba(20, 184, 166, 0.15);

  /* Colors - Semantic */
  --color-success: #10b981;
  --color-warning: #f59e0b;
  --color-error: #ef4444;
  --color-info: #3b82f6;

  /* Colors - Border */
  --color-border: #27272a;
  --color-border-subtle: #1f1f23;
  --color-border-strong: #3f3f46;
  --color-border-accent: rgba(20, 184, 166, 0.3);

  /* Speaker Colors */
  --speaker-0: #14b8a6;
  --speaker-1: #f59e0b;
  --speaker-2: #8b5cf6;
  --speaker-3: #ec4899;
  --speaker-4: #3b82f6;
  --speaker-5: #10b981;
  --speaker-6: #f97316;
  --speaker-7: #06b6d4;

  /* Typography */
  --font-display: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;
  --font-body: 'Inter', -apple-system, BlinkMacSystemFont, 'Segoe UI', sans-serif;
  --font-mono: 'JetBrains Mono', 'SF Mono', 'Fira Code', monospace;

  /* Font Sizes */
  --text-xs: 0.75rem;
  --text-sm: 0.875rem;
  --text-base: 1rem;
  --text-lg: 1.125rem;
  --text-xl: 1.25rem;
  --text-2xl: 1.5rem;
  --text-3xl: 1.875rem;

  /* Spacing */
  --space-1: 0.25rem;
  --space-2: 0.5rem;
  --space-3: 0.75rem;
  --space-4: 1rem;
  --space-5: 1.25rem;
  --space-6: 1.5rem;
  --space-8: 2rem;
  --space-10: 2.5rem;
  --space-12: 3rem;

  /* Border Radius */
  --radius-sm: 0.25rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Shadows */
  --shadow-sm: 0 1px 2px 0 rgba(0, 0, 0, 0.4);
  --shadow-md: 0 4px 6px -1px rgba(0, 0, 0, 0.5), 0 2px 4px -2px rgba(0, 0, 0, 0.5);
  --shadow-lg: 0 10px 15px -3px rgba(0, 0, 0, 0.5), 0 4px 6px -4px rgba(0, 0, 0, 0.5);
  --shadow-glow: 0 0 20px rgba(20, 184, 166, 0.2);

  /* Animation */
  --duration-fast: 150ms;
  --duration-normal: 300ms;
  --duration-slow: 500ms;
  --easing-default: cubic-bezier(0.4, 0, 0.2, 1);
  --easing-bounce: cubic-bezier(0.68, -0.55, 0.265, 1.55);
}

/* ==========================================
   BASE & RESET
   ========================================== */

*,
*::before,
*::after {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
}

/* Feature #82: Full viewport layout - body fills entire viewport */
body {
  font-family: var(--font-body);
  background-color: var(--color-bg-primary);
  color: var(--color-text-primary);
  line-height: 1.5;
  width: 100%;
  /* Use 100% instead of 100vw to exclude scrollbar width and prevent horizontal overflow */
  height: 100vh;
  overflow: hidden;
  /* Prevent body scroll - content areas handle their own scrolling */
}

/* ==========================================
   LAYOUT (Feature #82: Responsive Full-Window)
   ========================================== */

/* Feature #82: App container fills entire viewport using flexbox */
.app-container {
  display: flex;
  flex-direction: column;
  width: 100%;
  height: 100vh;
  max-width: none;
  /* Remove fixed max-width constraint */
  padding: var(--space-6);
  overflow: hidden;
  /* Prevent container scroll */
}

.header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  margin-bottom: var(--space-6);
}

.header__title {
  font-family: var(--font-display);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-text-primary);
  letter-spacing: -0.02em;
}

.header__title span {
  color: var(--color-accent);
}

.header__subtitle {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

.header__brand {
  display: block;
  transition: opacity var(--duration-fast) var(--easing-default);
}

.header__brand:hover {
  opacity: 0.8;
}

.header__brand:hover .header__title span {
  text-shadow: 0 0 10px var(--color-accent);
}

/* Feature #82: Main content uses flexbox for responsive layout */
.main-content {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  flex: 1;
  min-height: 0;
  /* Critical: Allow flexbox to shrink for proper scroll behavior */
  overflow: hidden;
  /* Prevent main content overflow */
}

@media (min-width: 1024px) {

  /* Feature #82: Desktop layout - sidebar + content area using flexbox */
  .main-content {
    flex-direction: row;
  }
}

/* ==========================================
   TAB NAVIGATION
   ========================================== */

.tab-nav {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-6);
  border-bottom: 1px solid var(--color-border);
  padding-bottom: var(--space-3);
}

.tab-nav__tab {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md) var(--radius-md) 0 0;
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
  position: relative;
}

.tab-nav__tab:hover {
  color: var(--color-text-primary);
  background-color: var(--color-surface);
}

.tab-nav__tab--active {
  color: var(--color-accent);
  background-color: var(--color-surface);
  border-color: var(--color-border);
  border-bottom-color: var(--color-surface);
}

.tab-nav__tab--active::after {
  content: '';
  position: absolute;
  bottom: -1px;
  left: 0;
  right: 0;
  height: 2px;
  background-color: var(--color-accent);
}

.tab-nav__icon {
  width: 18px;
  height: 18px;
}

/* Tab Panels (Feature #82: Flexbox layout for responsive behavior) */
.tab-panel {
  display: none;
}

.tab-panel--active {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  flex: 1;
  min-height: 0;
  /* Critical: Allow flexbox to shrink for proper scroll behavior */
  overflow: hidden;
  /* Prevent tab panel overflow */
}

@media (min-width: 1024px) {

  /* Feature #82: Desktop layout - sidebar + content using flexbox with responsive widths */
  .tab-panel--active {
    flex-direction: row;
  }

  /* Feature #82, #85: Sidebar uses responsive width with clamp() - reduced from 50% to ~25% */
  .tab-panel--active>aside {
    width: clamp(250px, 25vw, 400px);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    min-height: 0;
  }

  /* Feature #82: Content area expands to fill remaining space */
  .tab-panel--active>section {
    flex: 1;
    min-width: 0;
    /* Allow content to shrink below intrinsic width */
    display: flex;
    flex-direction: column;
    min-height: 0;
  }
}

/* ==========================================
   PANELS (Feature #82: Flexbox fill behavior)
   ========================================== */

.panel {
  background-color: var(--color-surface);
  border-radius: var(--radius-lg);
  border: 1px solid var(--color-border);
  overflow: hidden;
  display: flex;
  flex-direction: column;
  flex: 1;
  /* Feature #82: Panels expand to fill available space */
  min-height: 0;
  /* Critical: Allow flexbox to shrink for proper scroll behavior */
}

.panel__header {
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface-elevated);
}

.panel__header--with-actions {
  display: flex;
  align-items: center;
  justify-content: space-between;
}

.panel__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

/* Feature #82: Panel content fills remaining space and handles its own scrolling */
.panel__content {
  padding: var(--space-5);
  flex: 1;
  min-height: 0;
  /* Critical: Allow flexbox to shrink for proper scroll behavior */
  overflow-y: auto;
  /* Enable vertical scrolling within panel content */
}

/* ==========================================
   UPLOAD ZONE
   ========================================== */

.upload-zone {
  border: 2px dashed var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-10);
  text-align: center;
  transition: all var(--duration-normal) var(--easing-default);
  cursor: pointer;
  background-color: var(--color-surface-sunken);
  position: relative;
}

.upload-zone:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.upload-zone.drag-over {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
  box-shadow: var(--shadow-glow);
  transform: scale(1.01);
}

.upload-zone.has-file {
  border-color: var(--color-success);
  border-style: solid;
}

.upload-zone.has-merged-file {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.upload-zone__icon {
  width: 48px;
  height: 48px;
  margin: 0 auto var(--space-4);
  color: var(--color-text-tertiary);
  transition: color var(--duration-normal) var(--easing-default);
}

.upload-zone:hover .upload-zone__icon,
.upload-zone.drag-over .upload-zone__icon {
  color: var(--color-accent);
}

.upload-zone__text {
  font-size: var(--text-base);
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.upload-zone__hint {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
}

.upload-zone__file-info {
  margin-top: var(--space-4);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
}

.upload-zone__filename {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  word-break: break-all;
}

.upload-zone__filesize {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

/* Hidden file input */
.upload-zone__input {
  display: none;
}

/* ==========================================
   MERGED FILE INDICATOR
   ========================================== */

.merged-file-indicator {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  margin-top: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-accent-glow);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-md);
  color: var(--color-accent);
  font-size: var(--text-sm);
  animation: slideUp var(--duration-normal) var(--easing-default);
}

@keyframes slideUp {
  from {
    opacity: 0;
    transform: translateY(8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.merged-file-indicator__icon {
  width: 18px;
  height: 18px;
  flex-shrink: 0;
}

.merged-file-indicator span {
  flex: 1;
}

.merged-file-indicator__clear {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  padding: 0;
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
  flex-shrink: 0;
}

.merged-file-indicator__clear:hover {
  background-color: var(--color-error);
  border-color: var(--color-error);
  color: var(--color-text-primary);
}

.merged-file-indicator__clear svg {
  width: 14px;
  height: 14px;
}

/* ==========================================
   SETTINGS FORM
   ========================================== */

.settings-form {
  margin-top: var(--space-6);
}

.form-group {
  margin-bottom: var(--space-4);
}

.form-group__label {
  display: block;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.form-group__optional {
  font-weight: 400;
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  margin-left: var(--space-1);
}

.form-group__hint {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

.form-group__error {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: var(--text-xs);
  color: var(--color-error);
  margin-top: var(--space-1);
  animation: shake 0.3s ease-in-out;
}

.form-group__error-icon {
  width: 14px;
  height: 14px;
  flex-shrink: 0;
}

@keyframes shake {

  0%,
  100% {
    transform: translateX(0);
  }

  25% {
    transform: translateX(-4px);
  }

  75% {
    transform: translateX(4px);
  }
}

/* Input wrapper for suffix display */
.form-input-wrapper {
  position: relative;
  display: flex;
  align-items: center;
}

.form-input-wrapper .form-input {
  padding-right: 5.5rem;
}

.form-input-suffix {
  position: absolute;
  right: var(--space-3);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  pointer-events: none;
  user-select: none;
}

.form-input,
.form-select {
  width: 100%;
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-primary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  transition: all var(--duration-fast) var(--easing-default);
}

.form-input:hover,
.form-select:hover {
  border-color: var(--color-border-strong);
}

.form-input:focus,
.form-select:focus {
  outline: none;
  border-color: var(--color-accent);
  box-shadow: 0 0 0 3px var(--color-accent-glow);
}

/* Error state for form inputs */
.form-input--error,
.form-input--error:hover,
.form-input--error:focus {
  border-color: var(--color-error);
  box-shadow: 0 0 0 3px rgba(239, 68, 68, 0.15);
}

/* Valid state for form inputs */
.form-input--valid,
.form-input--valid:hover {
  border-color: var(--color-success);
}

.form-input--valid:focus {
  border-color: var(--color-success);
  box-shadow: 0 0 0 3px rgba(16, 185, 129, 0.15);
}

.form-select {
  cursor: pointer;
  appearance: none;
  background-image: url("data:image/svg+xml,%3Csvg xmlns='http://www.w3.org/2000/svg' width='12' height='12' viewBox='0 0 12 12' fill='none'%3E%3Cpath d='M2.5 4.5L6 8L9.5 4.5' stroke='%23a1a1aa' stroke-width='1.5' stroke-linecap='round' stroke-linejoin='round'/%3E%3C/svg%3E");
  background-repeat: no-repeat;
  background-position: right var(--space-3) center;
  padding-right: var(--space-8);
}

/* ==========================================
   CAMPAIGN SELECTOR
   ========================================== */

.campaign-selector {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}

.campaign-new-input {
  margin-top: var(--space-2);
  animation: slideDown var(--duration-fast) var(--easing-default);
}

@keyframes slideDown {
  from {
    opacity: 0;
    transform: translateY(-8px);
  }

  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.campaign-new-input__field {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.campaign-new-input__field .form-input {
  flex: 1;
  padding-right: var(--space-3);
}

.campaign-new-input__cancel {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  padding: 0;
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
  flex-shrink: 0;
}

.campaign-new-input__cancel:hover {
  background-color: var(--color-error);
  border-color: var(--color-error);
  color: var(--color-text-primary);
}

.campaign-new-input__cancel svg {
  width: 16px;
  height: 16px;
}

/* ==========================================
   BUTTONS
   ========================================== */

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
  border: none;
}

.btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}

.btn--primary {
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.btn--primary:hover:not(:disabled) {
  background-color: var(--color-accent-hover);
  box-shadow: var(--shadow-glow);
}

.btn--success {
  background-color: var(--color-success);
  color: #ffffff;
}

.btn--success:hover:not(:disabled) {
  background-color: #059669;
  /* Slightly darker emerald */
  box-shadow: 0 0 15px rgba(16, 185, 129, 0.2);
}

.btn--secondary {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-primary);
  border: 1px solid var(--color-border);
}

.btn--secondary:hover:not(:disabled) {
  background-color: var(--color-border);
  border-color: var(--color-border-strong);
}

.btn--ghost {
  background-color: transparent;
  color: var(--color-text-secondary);
}

.btn--ghost:hover:not(:disabled) {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-primary);
}

.btn--full {
  width: 100%;
}

.btn--sm {
  padding: var(--space-2) var(--space-3);
  font-size: var(--text-xs);
}

.btn__icon {
  width: 16px;
  height: 16px;
}

/* ==========================================
   PROGRESS
   ========================================== */

.progress-section {
  margin-top: var(--space-6);
  display: none;
}

.progress-section.visible {
  display: block;
}

.progress-bar-container {
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-full);
  height: 8px;
  overflow: hidden;
  margin-bottom: var(--space-3);
}

.progress-bar {
  height: 100%;
  background: linear-gradient(90deg, var(--color-accent) 0%, var(--color-accent-secondary) 100%);
  border-radius: var(--radius-full);
  transition: width var(--duration-normal) var(--easing-default);
  width: 0%;
}

.progress-bar.indeterminate {
  width: 30%;
  animation: indeterminate 1.5s ease-in-out infinite;
}

@keyframes indeterminate {
  0% {
    transform: translateX(-100%);
  }

  100% {
    transform: translateX(400%);
  }
}

.progress-info {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.progress-status {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.progress-percentage {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
}

.progress-stage {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-2);
  font-family: var(--font-mono);
}

/* ==========================================
   RESULTS PANEL
   ========================================== */

/* Feature #82: Results panel fills available space */
.results-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  /* Feature #82: Fill available space in parent container */
  min-height: 400px;
  /* Minimum usable height */
}

.results-panel .panel__content {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  padding: 0;
}

.results-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-tertiary);
}

.results-empty__icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.results-empty__text {
  font-size: var(--text-base);
}

/* Results Toolbar */
.results-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface);
  flex-shrink: 0;
}

.results-toolbar__info {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.results-toolbar__info span {
  color: var(--color-accent);
  font-weight: 500;
}

.results-toolbar__actions {
  display: flex;
  gap: var(--space-2);
}

/* Transcript Container */
.transcript-container {
  flex: 1;
  overflow-y: auto;
  padding: var(--space-5);
}

/* Segment Styles */
.segment {
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
  border-left: 3px solid var(--color-border);
  transition: all var(--duration-fast) var(--easing-default);
}

.segment:hover {
  background-color: var(--color-surface-elevated);
}

.segment__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.segment__speaker {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  background-color: var(--color-surface);
}

.segment__timestamp {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.segment__text {
  font-size: var(--text-base);
  line-height: 1.7;
  color: var(--color-text-primary);
}

/* Speaker color coding */
.segment[data-speaker="0"] {
  border-left-color: var(--speaker-0);
}

.segment[data-speaker="0"] .segment__speaker {
  color: var(--speaker-0);
}

.segment[data-speaker="1"] {
  border-left-color: var(--speaker-1);
}

.segment[data-speaker="1"] .segment__speaker {
  color: var(--speaker-1);
}

.segment[data-speaker="2"] {
  border-left-color: var(--speaker-2);
}

.segment[data-speaker="2"] .segment__speaker {
  color: var(--speaker-2);
}

.segment[data-speaker="3"] {
  border-left-color: var(--speaker-3);
}

.segment[data-speaker="3"] .segment__speaker {
  color: var(--speaker-3);
}

.segment[data-speaker="4"] {
  border-left-color: var(--speaker-4);
}

.segment[data-speaker="4"] .segment__speaker {
  color: var(--speaker-4);
}

.segment[data-speaker="5"] {
  border-left-color: var(--speaker-5);
}

.segment[data-speaker="5"] .segment__speaker {
  color: var(--speaker-5);
}

.segment[data-speaker="6"] {
  border-left-color: var(--speaker-6);
}

.segment[data-speaker="6"] .segment__speaker {
  color: var(--speaker-6);
}

.segment[data-speaker="7"] {
  border-left-color: var(--speaker-7);
}

.segment[data-speaker="7"] .segment__speaker {
  color: var(--speaker-7);
}

/* ==========================================
   SPEAKER LEGEND
   ========================================== */

.speaker-legend {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-5);
  border-bottom: 1px solid var(--color-border);
  background-color: var(--color-surface-sunken);
}

.speaker-legend__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
}

.speaker-legend__dot {
  width: 8px;
  height: 8px;
  border-radius: var(--radius-full);
}

/* ==========================================
   STATUS BADGES
   ========================================== */

.status-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-1) var(--space-3);
  border-radius: var(--radius-full);
  font-size: var(--text-xs);
  font-weight: 500;
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.status-badge--pending {
  background-color: rgba(113, 113, 122, 0.2);
  color: var(--color-text-tertiary);
}

.status-badge--processing {
  background-color: rgba(59, 130, 246, 0.2);
  color: var(--color-info);
}

.status-badge--completed {
  background-color: rgba(16, 185, 129, 0.2);
  color: var(--color-success);
}

.status-badge--failed {
  background-color: rgba(239, 68, 68, 0.2);
  color: var(--color-error);
}

.status-badge__dot {
  width: 6px;
  height: 6px;
  border-radius: var(--radius-full);
  background-color: currentColor;
}

.status-badge--processing .status-badge__dot {
  animation: pulse 1.5s ease-in-out infinite;
}

@keyframes pulse {

  0%,
  100% {
    opacity: 1;
  }

  50% {
    opacity: 0.4;
  }
}

/* ==========================================
   TOAST NOTIFICATIONS
   ========================================== */

.toast-container {
  position: fixed;
  bottom: var(--space-6);
  right: var(--space-6);
  z-index: 1000;
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

.toast {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-4);
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  min-width: 300px;
  animation: toast-in var(--duration-normal) var(--easing-default);
}

.toast.toast-out {
  animation: toast-out var(--duration-fast) var(--easing-default) forwards;
}

@keyframes toast-in {
  from {
    opacity: 0;
    transform: translateX(100%);
  }

  to {
    opacity: 1;
    transform: translateX(0);
  }
}

@keyframes toast-out {
  from {
    opacity: 1;
    transform: translateX(0);
  }

  to {
    opacity: 0;
    transform: translateX(100%);
  }
}

.toast__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.toast--success .toast__icon {
  color: var(--color-success);
}

.toast--error .toast__icon {
  color: var(--color-error);
}

.toast--info .toast__icon {
  color: var(--color-info);
}

.toast--warning .toast__icon {
  color: var(--color-warning);
}

.toast__message {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

.toast__close {
  background: none;
  border: none;
  color: var(--color-text-tertiary);
  cursor: pointer;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--easing-default);
}

.toast__close:hover {
  color: var(--color-text-primary);
  background-color: var(--color-surface);
}

/* ==========================================
   LOADING STATES
   ========================================== */

.loading-spinner {
  width: 24px;
  height: 24px;
  border: 2px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

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

/* ==========================================
   MERGE TAB STYLES
   ========================================== */

.merge-info {
  margin-bottom: var(--space-5);
  padding: var(--space-4);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
}

.merge-info__label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-1);
}

.merge-info__path {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-accent);
  margin-bottom: var(--space-2);
}

.merge-info__hint {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* Merge File List */
.merge-file-list {
  margin-bottom: var(--space-4);
  max-height: 300px;
  overflow-y: auto;
}

.merge-file-list__loading,
.merge-file-list__empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
  color: var(--color-text-tertiary);
  gap: var(--space-3);
}

.merge-file-list__empty-icon {
  width: 48px;
  height: 48px;
  opacity: 0.5;
}

.merge-file-list__empty-hint {
  font-size: var(--text-xs);
}

/* Merge File Item */
.merge-file-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  transition: all var(--duration-fast) var(--easing-default);
}

.merge-file-item:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-border-strong);
}

.merge-file-item__checkbox {
  flex-shrink: 0;
}

.merge-file-item__checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-accent);
}

.merge-file-item__drag-handle {
  flex-shrink: 0;
  color: var(--color-text-tertiary);
  cursor: grab;
}

.merge-file-item__drag-handle svg {
  width: 16px;
  height: 16px;
}

.merge-file-item__info {
  flex: 1;
  min-width: 0;
}

.merge-file-item__name {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  word-break: break-all;
}

.merge-file-item__meta {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

/* Merge Sort Controls */
.merge-sort-controls {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
}

.merge-sort-controls__label {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.merge-sort-controls__buttons {
  display: flex;
  gap: var(--space-2);
  flex-wrap: wrap;
}

/* Merge Output Settings */
.merge-output-settings {
  margin-bottom: var(--space-4);
}

/* Merge Preview Panel */
/* Feature #82: Merge result panel fills available space */
.merge-result-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  /* Feature #82: Fill available space */
  min-height: 400px;
}

.merge-preview-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-tertiary);
}

.merge-preview-empty__icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.merge-preview-empty__text {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}

.merge-preview-empty__hint {
  font-size: var(--text-sm);
}

/* Merge Preview Summary */
.merge-preview-summary {
  display: flex;
  gap: var(--space-6);
  padding: var(--space-5);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-5);
}

.merge-preview-summary__stat {
  text-align: center;
}

.merge-preview-summary__value {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-2xl);
  font-weight: 600;
  color: var(--color-accent);
}

.merge-preview-summary__label {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-top: var(--space-1);
}

/* Merge Preview Order */
.merge-preview-order {
  margin-bottom: var(--space-5);
}

.merge-preview-order__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.merge-preview-order__list {
  list-style: none;
  counter-reset: merge-order;
}

.merge-preview-order__item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
}

.merge-preview-order__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background-color: var(--color-accent);
  color: var(--color-text-inverse);
  border-radius: var(--radius-full);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  font-weight: 600;
  flex-shrink: 0;
}

.merge-preview-order__name {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  word-break: break-all;
}

/* Merge Complete */
.merge-complete {
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  padding: var(--space-6);
  background-color: rgba(16, 185, 129, 0.1);
  border: 1px solid rgba(16, 185, 129, 0.3);
  border-radius: var(--radius-lg);
  animation: fadeIn var(--duration-normal) var(--easing-default);
}

@keyframes fadeIn {
  from {
    opacity: 0;
  }

  to {
    opacity: 1;
  }
}

.merge-complete__icon {
  width: 48px;
  height: 48px;
  color: var(--color-success);
  margin-bottom: var(--space-4);
}

.merge-complete__title {
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-success);
  margin-bottom: var(--space-2);
}

.merge-complete__path {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  word-break: break-all;
  margin-bottom: var(--space-5);
  padding: var(--space-3);
  background-color: var(--color-surface);
  border-radius: var(--radius-md);
}

.merge-complete__actions {
  display: flex;
  gap: var(--space-3);
}

/* ==========================================
   CAMPAIGNS TAB STYLES
   ========================================== */

/* Feature #82: Campaigns sidebar fills available space */
.campaigns-sidebar {
  flex: 1;
  /* Feature #82: Fill available space in parent container */
  min-height: 400px;
  display: flex;
  flex-direction: column;
}

.campaigns-sidebar__content {
  flex: 1;
  overflow-y: auto;
}

.campaigns-loading,
.campaigns-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
  color: var(--color-text-tertiary);
  gap: var(--space-3);
}

.campaigns-empty__icon {
  width: 48px;
  height: 48px;
  opacity: 0.5;
}

.campaigns-empty__hint {
  font-size: var(--text-xs);
}

.campaign-list {
  padding: var(--space-2);
}

/* Campaign Detail Panel */
/* Feature #82: Campaigns detail panel fills available space */
.campaigns-detail-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  /* Feature #82: Fill available space in parent container */
  min-height: 400px;
}

.campaigns-detail-actions {
  display: flex;
  gap: var(--space-2);
}

.campaigns-detail-content {
  flex: 1;
  overflow-y: auto;
  padding: 0;
}

.campaigns-detail-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-tertiary);
}

.campaigns-detail-empty__icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.campaigns-detail-empty__text {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}

.campaigns-detail-empty__hint {
  font-size: var(--text-sm);
}

/* Session Metadata */
.session-metadata {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-4);
  padding: var(--space-5);
  background-color: var(--color-surface-sunken);
  border-bottom: 1px solid var(--color-border);
}

.session-metadata__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.session-metadata__label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.session-metadata__value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

/* Session Transcript Preview */
.session-transcript {
  padding: var(--space-5);
}

.session-transcript__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-4);
}

.session-transcript__content {
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  line-height: 1.7;
  white-space: pre-wrap;
}

/* Compare View */
.compare-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4);
  border-bottom: 1px solid var(--color-border);
}

.compare-header__title {
  font-family: var(--font-display);
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-primary);
}

.compare-panels {
  display: grid;
  grid-template-columns: 1fr 1fr;
  gap: var(--space-4);
  padding: var(--space-4);
}

.compare-panel {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow: hidden;
}

.compare-panel__header {
  padding: var(--space-3);
  background-color: var(--color-surface-elevated);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
}

.compare-panel__content {
  padding: var(--space-4);
  max-height: 400px;
  overflow-y: auto;
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  line-height: 1.7;
}

/* ==========================================
   RESPONSIVE ADJUSTMENTS (Feature #82: Full-window responsive)
   ========================================== */

@media (max-width: 768px) {

  /* Feature #82: Mobile adjustments for full-window layout */
  body {
    height: auto;
    /* Allow body to grow on mobile for better UX */
    min-height: 100vh;
    overflow-y: auto;
    /* Enable body scroll on mobile */
  }

  .app-container {
    padding: var(--space-4);
    height: auto;
    min-height: 100vh;
  }

  .header {
    flex-direction: column;
    align-items: flex-start;
    gap: var(--space-2);
    flex-shrink: 0;
    /* Don't shrink header on mobile */
  }

  .tab-nav {
    overflow-x: auto;
    padding-bottom: var(--space-2);
    flex-shrink: 0;
    /* Don't shrink tab nav on mobile */
  }

  .tab-nav__tab {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
    white-space: nowrap;
  }

  /* Feature #82: Mobile tab panels stack vertically */
  .tab-panel--active {
    flex-direction: column;
    overflow: visible;
    /* Allow natural flow on mobile */
  }

  .tab-panel--active>aside,
  .tab-panel--active>section {
    width: 100%;
    /* Full width on mobile */
    min-height: auto;
  }

  .results-toolbar {
    flex-direction: column;
    gap: var(--space-3);
    align-items: stretch;
  }

  .results-toolbar__actions {
    justify-content: stretch;
  }

  .results-toolbar__actions .btn {
    flex: 1;
  }

  .upload-zone {
    padding: var(--space-6);
  }

  .results-panel {
    height: auto;
    min-height: 400px;
  }

  .merge-preview-summary {
    flex-direction: column;
    gap: var(--space-4);
  }

  .merge-sort-controls {
    flex-direction: column;
    align-items: flex-start;
  }

  .compare-panels {
    grid-template-columns: 1fr;
  }
}

/* ==========================================
   SCROLLBAR STYLING
   ========================================== */

::-webkit-scrollbar {
  width: 8px;
  height: 8px;
}

::-webkit-scrollbar-track {
  background: var(--color-bg-secondary);
}

::-webkit-scrollbar-thumb {
  background: var(--color-border);
  border-radius: var(--radius-full);
}

::-webkit-scrollbar-thumb:hover {
  background: var(--color-border-strong);
}

/* Firefox */
* {
  scrollbar-width: thin;
  scrollbar-color: var(--color-border) var(--color-bg-secondary);
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */

/* ==========================================
   KNOWLEDGE BASE TAB STYLES
   ========================================== */

/* Feature #82: KB sidebar fills available space */
.kb-sidebar {
  flex: 1;
  /* Feature #82: Fill available space in parent container */
  min-height: 400px;
  display: flex;
  flex-direction: column;
}

.kb-sidebar__content {
  flex: 1;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
}

.kb-loading,
.kb-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
  color: var(--color-text-tertiary);
  gap: var(--space-3);
}

.kb-empty__icon {
  width: 48px;
  height: 48px;
  opacity: 0.5;
}

.kb-empty__hint {
  font-size: var(--text-xs);
}

/* KB Document List */
.kb-document-list {
  flex: 1;
  display: flex;
  flex-direction: column;
  margin-top: var(--space-4);
}

.kb-document-list__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-3);
}

.kb-document-list__select-all {
  display: flex;
  align-items: center;
}

.kb-document-list__count {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.kb-document-list__items {
  flex: 1;
  overflow-y: auto;
  max-height: 250px;
}

/* KB Document Item */
.kb-doc-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  transition: all var(--duration-fast) var(--easing-default);
  cursor: pointer;
}

.kb-doc-item:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-border-strong);
}

.kb-doc-item--selected {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.kb-doc-item__checkbox {
  flex-shrink: 0;
}

.kb-doc-item__checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-accent);
}

.kb-doc-item__info {
  flex: 1;
  min-width: 0;
}

.kb-doc-item__name {
  display: block;
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  word-break: break-all;
}

.kb-doc-item__meta {
  display: block;
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

/* Feature #104: Processing metadata display */
.kb-doc-item__meta--processed {
  color: var(--color-success);
  font-size: 0.875rem;
  font-style: italic;
  margin-left: 0.5rem;
}

.kb-doc-item__status {
  flex-shrink: 0;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
}

.kb-doc-item__status--processed {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
}

/* Feature #104: Add checkmark icon to processed badge */
.kb-doc-item__status--processed::before {
  content: "✓ ";
  font-weight: bold;
}

.kb-doc-item__status--pending {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
}

.kb-doc-item__status--new {
  background-color: rgba(59, 130, 246, 0.15);
  color: var(--color-info);
}

/* KB Actions */
.kb-actions {
  margin-top: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}

/* KB Detail Panel */
/* Feature #82: KB detail panel fills available space */
.kb-detail-panel {
  display: flex;
  flex-direction: column;
  flex: 1;
  /* Feature #82: Fill available space in parent container */
  min-height: 400px;
}

.kb-detail-content {
  flex: 1;
  overflow-y: auto;
  padding: 0;
}

.kb-detail-empty {
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-tertiary);
}

.kb-detail-empty__icon {
  width: 64px;
  height: 64px;
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.kb-detail-empty__text {
  font-size: var(--text-base);
  margin-bottom: var(--space-2);
}

.kb-detail-empty__hint {
  font-size: var(--text-sm);
  max-width: 400px;
}

/* KB Status Summary */
.kb-status-summary {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(150px, 1fr));
  gap: var(--space-4);
  padding: var(--space-5);
  background-color: var(--color-surface-sunken);
  border-bottom: 1px solid var(--color-border);
}

.kb-status-summary__item {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.kb-status-summary__label {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.kb-status-summary__value {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

/* KB Status Badge */
.kb-status-badge {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
}

.kb-status-badge--built {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
}

.kb-status-badge--partial {
  background-color: rgba(245, 158, 11, 0.15);
  color: var(--color-warning);
}

.kb-status-badge--error {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--color-error);
}

/* KB Info Section */
.kb-info-section {
  padding: var(--space-5);
}

.kb-info-section__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.kb-info-section__text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-3);
}

.kb-info-section__list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.kb-info-section__list li {
  position: relative;
  padding-left: var(--space-5);
  margin-bottom: var(--space-2);
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
}

.kb-info-section__list li::before {
  content: '';
  position: absolute;
  left: 0;
  top: 0.5em;
  width: 6px;
  height: 6px;
  background-color: var(--color-accent);
  border-radius: var(--radius-full);
}

/* KB Processing Log */
.kb-log {
  padding: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.kb-log__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.kb-log__content {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  background-color: var(--color-surface-sunken);
  padding: var(--space-4);
  border-radius: var(--radius-md);
  max-height: 200px;
  overflow-y: auto;
  white-space: pre-wrap;
  line-height: 1.6;
}

.kb-log__entry {
  padding: var(--space-1) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.kb-log__entry:last-child {
  border-bottom: none;
}

.kb-log__entry--success {
  color: var(--color-success);
}

.kb-log__entry--error {
  color: var(--color-error);
}

.kb-log__entry--info {
  color: var(--color-info);
}

/* ==========================================
   KB PROCESSING QUEUE & RESULTS (Feature #57)
   ========================================== */

/* Processing Queue */
.kb-processing-queue {
  padding: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.kb-processing-queue__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.kb-processing-queue__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 200px;
  overflow-y: auto;
}

/* Queue Item */
.kb-queue-item {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-queue-item--current {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.kb-queue-item--completed {
  border-color: var(--color-success);
  background-color: rgba(16, 185, 129, 0.08);
}

.kb-queue-item--error {
  border-color: var(--color-error);
  background-color: rgba(239, 68, 68, 0.08);
}

.kb-queue-item__icon {
  width: 20px;
  height: 20px;
  flex-shrink: 0;
}

.kb-queue-item--pending .kb-queue-item__icon {
  color: var(--color-text-tertiary);
}

.kb-queue-item--current .kb-queue-item__icon {
  color: var(--color-accent);
  animation: spin 1s linear infinite;
}

.kb-queue-item--completed .kb-queue-item__icon {
  color: var(--color-success);
}

.kb-queue-item--error .kb-queue-item__icon {
  color: var(--color-error);
}

.kb-queue-item__info {
  flex: 1;
  min-width: 0;
}

.kb-queue-item__name {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kb-queue-item__phase {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

.kb-queue-item--current .kb-queue-item__phase {
  color: var(--color-accent);
}

.kb-queue-item__status {
  flex-shrink: 0;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
}

.kb-queue-item--pending .kb-queue-item__status {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-tertiary);
}

.kb-queue-item--current .kb-queue-item__status {
  background-color: rgba(20, 184, 166, 0.15);
  color: var(--color-accent);
}

.kb-queue-item--completed .kb-queue-item__status {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
}

.kb-queue-item--error .kb-queue-item__status {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--color-error);
}

/* Extraction Results */
.kb-extraction-results {
  padding: var(--space-5);
  border-top: 1px solid var(--color-border);
}

.kb-extraction-results__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-3);
}

.kb-extraction-results__list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  max-height: 300px;
  overflow-y: auto;
}

/* Result Item */
.kb-result-item {
  padding: var(--space-4);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  animation: slideUp var(--duration-normal) var(--easing-default);
}

.kb-result-item__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-3);
}

.kb-result-item__doc {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
}

.kb-result-item__status {
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
}

.kb-result-item__status--success {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
}

.kb-result-item__status--error {
  background-color: rgba(239, 68, 68, 0.15);
  color: var(--color-error);
}

.kb-result-item__counts {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.kb-result-item__count {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

.kb-result-item__count-value {
  font-weight: 600;
  color: var(--color-accent);
}

.kb-result-item__error {
  margin-top: var(--space-2);
  padding: var(--space-2);
  background-color: rgba(239, 68, 68, 0.1);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-error);
}

/* ==========================================
   KB MANIFEST SECTION (Feature #105)
   ========================================== */

/* Manifest Section */
.kb-manifest-section {
  margin-top: var(--space-6);
  padding-top: var(--space-6);
  border-top: 1px solid var(--color-border);
}

.kb-manifest-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-4);
}

.kb-manifest-header__title {
  font-size: var(--text-base);
  font-weight: 600;
  color: var(--color-text-primary);
}

.kb-manifest-header__count {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  font-family: var(--font-mono);
}

/* Manifest List */
.kb-manifest-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  max-height: 300px;
  overflow-y: auto;
}

/* Manifest Item */
.kb-manifest-item {
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  transition: all 0.2s;
}

.kb-manifest-item:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-accent);
}

.kb-manifest-item__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  margin-bottom: var(--space-2);
}

.kb-manifest-item__filename {
  font-size: var(--text-sm);
  font-family: var(--font-mono);
  color: var(--color-text-primary);
  font-weight: 500;
}

.kb-manifest-item__reprocess {
  opacity: 0;
  transition: opacity 0.2s;
}

.kb-manifest-item:hover .kb-manifest-item__reprocess {
  opacity: 1;
}

.kb-manifest-item__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.kb-manifest-item__date {
  font-family: var(--font-mono);
}

.kb-manifest-item__meta-sep::before {
  content: '·';
}

.kb-manifest-item__entries {
  color: var(--color-accent);
  font-weight: 500;
}

/* Manifest Empty State */
.kb-manifest-empty {
  text-align: center;
  padding: var(--space-8) var(--space-4);
  color: var(--color-text-tertiary);
}

.kb-manifest-empty__text {
  font-size: var(--text-sm);
  margin-bottom: var(--space-2);
}

.kb-manifest-empty__hint {
  font-size: var(--text-xs);
}

/* KB Cancel Button */
.kb-cancel-btn {
  margin-top: var(--space-3);
  width: 100%;
}

/* KB Progress Stage Enhancement */
.progress-stage--active {
  color: var(--color-accent);
  font-weight: 500;
}

/* ==========================================
   MODAL STYLES
   ========================================== */

.modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.7);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 1000;
  animation: fadeIn var(--duration-fast) var(--easing-default);
}

.modal {
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  max-width: 480px;
  width: 90%;
  animation: modalSlideIn var(--duration-normal) var(--easing-default);
}

@keyframes modalSlideIn {
  from {
    opacity: 0;
    transform: translateY(-20px) scale(0.95);
  }

  to {
    opacity: 1;
    transform: translateY(0) scale(1);
  }
}

.modal__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  border-bottom: 1px solid var(--color-border);
}

.modal__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-primary);
}

.modal__close {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background-color: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.modal__close:hover {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-primary);
}

.modal__close svg {
  width: 20px;
  height: 20px;
}

.modal__content {
  padding: var(--space-5);
}

.modal__content p {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
}

.modal__actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-3);
  padding: var(--space-4) var(--space-5);
  border-top: 1px solid var(--color-border);
  background-color: var(--color-surface-sunken);
  border-radius: 0 0 var(--radius-lg) var(--radius-lg);
}

/* ==========================================
   OBSIDIAN SETUP MODAL (Feature #78)
   ========================================== */

/* Obsidian accent color */
:root {
  --color-obsidian: #7C3AED;
  --color-obsidian-hover: #6D28D9;
  --color-obsidian-glow: rgba(124, 58, 237, 0.2);
}

.modal--obsidian-setup {
  max-width: 520px;
}

.modal--obsidian-setup .modal__header {
  border-bottom-color: var(--color-obsidian);
}

.modal--obsidian-setup .modal__header-content {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.modal--obsidian-setup .modal__header-icon {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 36px;
  height: 36px;
  background-color: var(--color-obsidian-glow);
  border-radius: var(--radius-md);
  flex-shrink: 0;
}

.modal--obsidian-setup .modal__header-icon svg {
  width: 20px;
  height: 20px;
  color: var(--color-obsidian);
}

.modal--obsidian-setup .modal__description {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.6;
  margin-bottom: var(--space-4);
}

.modal--obsidian-setup .modal__description strong {
  color: var(--color-text-primary);
}

/* Instruction list styling */
.obsidian-instructions {
  list-style: none;
  padding: 0;
  margin: 0;
  counter-reset: step;
}

.obsidian-instructions__item {
  display: flex;
  gap: var(--space-3);
  padding: var(--space-3) 0;
  border-bottom: 1px solid var(--color-border-subtle);
}

.obsidian-instructions__item:last-child {
  border-bottom: none;
}

.obsidian-instructions__number {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 24px;
  height: 24px;
  background-color: var(--color-obsidian);
  color: #ffffff;
  font-size: var(--text-xs);
  font-weight: 600;
  border-radius: var(--radius-full);
  flex-shrink: 0;
}

.obsidian-instructions__text {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  line-height: 1.5;
}

.obsidian-instructions__text strong {
  color: var(--color-text-primary);
  font-weight: 500;
}

.obsidian-instructions__text code {
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  background-color: var(--color-surface-sunken);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  color: var(--color-obsidian);
}

/* Obsidian modal actions */
.modal--obsidian-setup .modal__actions {
  flex-direction: column;
  gap: var(--space-3);
}

.modal--obsidian-setup .modal__actions-row {
  display: flex;
  gap: var(--space-3);
  width: 100%;
}

/* Obsidian primary button style */
.btn--obsidian {
  background-color: var(--color-obsidian);
  color: #ffffff;
  flex: 1;
}

.btn--obsidian:hover:not(:disabled) {
  background-color: var(--color-obsidian-hover);
  box-shadow: 0 0 20px var(--color-obsidian-glow);
}

.btn--obsidian svg {
  color: #ffffff;
}

/* Modal hint text */
.modal--obsidian-setup .modal__hint {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-align: center;
  margin-top: var(--space-2);
}

/* ==========================================
   FORM CHECKBOX STYLES
   ========================================== */

.form-checkbox {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
}

.form-checkbox input[type="checkbox"] {
  width: 18px;
  height: 18px;
  cursor: pointer;
  accent-color: var(--color-accent);
  flex-shrink: 0;
}

.form-checkbox__label {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.form-checkbox__tooltip {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-tertiary);
  background-color: var(--color-surface-elevated);
  border-radius: var(--radius-full);
  cursor: help;
}

/* Form Details (collapsible sections) */
.form-details {
  margin: var(--space-4) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
}

.form-details__summary {
  padding: var(--space-3) var(--space-4);
  cursor: pointer;
  user-select: none;
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.form-details__summary:hover {
  color: var(--color-text-primary);
  background: var(--color-surface-hover);
}

.form-details[open] .form-details__summary {
  border-bottom: 1px solid var(--color-border);
}

.form-details__content {
  padding: var(--space-4);
}

/* ==========================================
   CAMPAIGN ITEM STYLES
   ========================================== */

.campaign-item {
  padding: var(--space-4);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.campaign-item:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-border-strong);
}

.campaign-item--active {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.campaign-item__name {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.campaign-item__meta {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* ==========================================
   CAMPAIGN KB INTEGRATION (Feature #59)
   ========================================== */

/* Campaign Item with KB Integration */
.campaign-item__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-bottom: var(--space-2);
}

.campaign-item__header-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
  min-width: 0;
}

.campaign-item__name {
  margin-bottom: 0;
}

/* KB Status Badge on Campaign */
.campaign-item__kb-badge {
  display: inline-flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  flex-shrink: 0;
  white-space: nowrap;
}

.campaign-item__kb-badge--exists {
  background-color: rgba(16, 185, 129, 0.15);
  color: var(--color-success);
}

.campaign-item__kb-badge--none {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-tertiary);
}

.campaign-item__kb-badge--loading {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-tertiary);
}

.campaign-item__kb-badge__icon {
  width: 12px;
  height: 12px;
}

.campaign-item__kb-badge--loading .campaign-item__kb-badge__icon {
  animation: spin 1s linear infinite;
}

/* Campaign Item Footer with Actions */
.campaign-item__footer {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-2);
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border-subtle);
}

.campaign-item__meta {
  flex: 1;
  min-width: 0;
}

.campaign-item__kb-actions {
  display: flex;
  gap: var(--space-2);
  flex-shrink: 0;
}

.campaign-item__kb-action {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
  white-space: nowrap;
}

.campaign-item__kb-action:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}

.campaign-item__kb-action--primary {
  background-color: var(--color-accent-glow);
  border-color: var(--color-border-accent);
  color: var(--color-accent);
}

.campaign-item__kb-action--primary:hover {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
  color: var(--color-text-inverse);
}

.campaign-item__kb-action__icon {
  width: 12px;
  height: 12px;
}

/* Campaign KB Activity Summary */
.campaign-item__kb-activity {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  margin-top: var(--space-1);
}

.campaign-item__kb-activity span {
  color: var(--color-accent);
}

/* Session Item Styles */
.session-list {
  margin-bottom: var(--space-4);
}

.session-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  margin-bottom: var(--space-2);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.session-item:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-border-strong);
}

.session-item--active {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.session-item__name {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  word-break: break-all;
}

.session-item__meta {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  flex-shrink: 0;
  margin-left: var(--space-2);
}

/* ==========================================
   KB BROWSER STYLES (Feature #58)
   ========================================== */

/* Mode Toggle */
.kb-mode-toggle {
  display: flex;
  gap: var(--space-2);
  margin-bottom: var(--space-4);
  padding: var(--space-1);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
}

.kb-mode-toggle__btn {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  font-weight: 500;
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-mode-toggle__btn:hover {
  color: var(--color-text-primary);
  background-color: var(--color-surface);
}

.kb-mode-toggle__btn--active {
  color: var(--color-accent);
  background-color: var(--color-surface);
  border-color: var(--color-border-accent);
}

.kb-mode-toggle__icon {
  width: 16px;
  height: 16px;
}

/* Browser Search */
.kb-browser-search {
  position: relative;
  display: flex;
  align-items: center;
}

.kb-browser-search__icon {
  position: absolute;
  left: var(--space-3);
  width: 16px;
  height: 16px;
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.kb-browser-search__input {
  padding-left: var(--space-10);
}

/* Category List */
.kb-browser-categories {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  margin-bottom: var(--space-4);
}

.kb-browser-category {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-3);
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-browser-category:hover {
  background-color: var(--color-surface-sunken);
  border-color: var(--color-border);
}

.kb-browser-category--active {
  background-color: var(--color-accent-glow);
  border-color: var(--color-border-accent);
}

.kb-browser-category__icon {
  width: 18px;
  height: 18px;
  color: var(--color-text-tertiary);
  flex-shrink: 0;
}

.kb-browser-category--active .kb-browser-category__icon {
  color: var(--color-accent);
}

.kb-browser-category__name {
  flex: 1;
  min-width: 0;
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kb-browser-category--active .kb-browser-category__name {
  color: var(--color-text-primary);
}

.kb-browser-category__count {
  flex-shrink: 0;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.kb-browser-category--active .kb-browser-category__count {
  background-color: var(--color-surface);
  color: var(--color-accent);
}

/* Entry List */
.kb-browser-entries {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-height: 0;
}

.kb-browser-entries__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-2) 0;
  margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border-subtle);
}

.kb-browser-entries__title {
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.kb-browser-entries__list {
  flex: 1;
  overflow-y: auto;
  max-height: 200px;
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.kb-browser-entries__empty {
  padding: var(--space-4);
  text-align: center;
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
}

/* Entry Item */
.kb-browser-entry {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-browser-entry:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-border-strong);
}

.kb-browser-entry--active {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.kb-browser-entry__name {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.kb-browser-entry__category {
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-transform: capitalize;
  flex-shrink: 0;
}

/* Entry Viewer */
.kb-entry-header {
  padding: var(--space-5);
  background-color: var(--color-surface-sunken);
  border-bottom: 1px solid var(--color-border);
}

.kb-entry-header__category {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-accent-glow);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.kb-entry-header__title {
  font-family: var(--font-display);
  font-size: var(--text-xl);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-2);
}

.kb-entry-header__meta {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

.kb-entry-content {
  padding: var(--space-5);
  overflow-y: auto;
  flex: 1;
}

.kb-entry-content__body {
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  line-height: 1.7;
}

/* Markdown rendering in entry viewer */
.kb-entry-content__body h1,
.kb-entry-content__body h2,
.kb-entry-content__body h3,
.kb-entry-content__body h4,
.kb-entry-content__body h5,
.kb-entry-content__body h6 {
  font-family: var(--font-display);
  color: var(--color-text-primary);
  margin-top: var(--space-5);
  margin-bottom: var(--space-3);
}

.kb-entry-content__body h1 {
  font-size: var(--text-2xl);
}

.kb-entry-content__body h2 {
  font-size: var(--text-xl);
}

.kb-entry-content__body h3 {
  font-size: var(--text-lg);
}

.kb-entry-content__body h4 {
  font-size: var(--text-base);
}

.kb-entry-content__body p {
  margin-bottom: var(--space-4);
}

.kb-entry-content__body ul,
.kb-entry-content__body ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-5);
}

.kb-entry-content__body li {
  margin-bottom: var(--space-2);
}

.kb-entry-content__body strong {
  font-weight: 600;
  color: var(--color-text-primary);
}

.kb-entry-content__body em {
  font-style: italic;
}

.kb-entry-content__body code {
  font-family: var(--font-mono);
  font-size: 0.9em;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-sm);
  color: var(--color-accent-secondary);
}

.kb-entry-content__body pre {
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.kb-entry-content__body pre code {
  padding: 0;
  background: none;
}

.kb-entry-content__body blockquote {
  margin-bottom: var(--space-4);
  padding: var(--space-3) var(--space-4);
  border-left: 3px solid var(--color-accent);
  background-color: var(--color-surface-sunken);
  color: var(--color-text-secondary);
  font-style: italic;
}

.kb-entry-content__body hr {
  margin: var(--space-6) 0;
  border: none;
  border-top: 1px solid var(--color-border);
}

/* Wiki-style cross-reference links */
.kb-entry-content__body a,
.kb-wiki-link {
  position: relative;
  color: var(--color-accent);
  text-decoration: none;
  cursor: pointer;
  border-bottom: 1px dotted var(--color-accent);
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-entry-content__body a:hover,
.kb-wiki-link:hover {
  color: var(--color-accent-hover);
  border-bottom-style: solid;
}

/* ==========================================
   WIKI-LINK NAVIGATION (Feature #71)
   ========================================== */

/* Valid wiki-links */
.kb-wiki-link--valid {
  position: relative;
}

/* Broken wiki-links (entry not found) */
.kb-wiki-link--broken {
  color: var(--color-error);
  border-bottom-color: var(--color-error);
  opacity: 0.7;
  cursor: not-allowed;
}

.kb-wiki-link--broken::before {
  content: '';
  position: absolute;
  left: 0;
  right: 0;
  top: 50%;
  height: 1px;
  background-color: var(--color-error);
  opacity: 0.5;
}

.kb-wiki-link--broken:hover {
  color: var(--color-error);
  opacity: 0.9;
  border-bottom-style: dashed;
}

/* Wiki-link tooltip preview */
.kb-wiki-link--has-tooltip {
  position: relative;
}

.kb-wiki-tooltip {
  position: absolute;
  bottom: calc(100% + 8px);
  left: 50%;
  transform: translateX(-50%);
  min-width: 180px;
  max-width: 280px;
  padding: var(--space-3);
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  opacity: 0;
  visibility: hidden;
  transition: opacity var(--duration-fast) var(--easing-default),
    visibility var(--duration-fast) var(--easing-default);
  z-index: 100;
  pointer-events: none;
}

/* Tooltip arrow */
.kb-wiki-tooltip::after {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 6px solid transparent;
  border-top-color: var(--color-border-strong);
}

.kb-wiki-tooltip::before {
  content: '';
  position: absolute;
  top: 100%;
  left: 50%;
  transform: translateX(-50%);
  border: 5px solid transparent;
  border-top-color: var(--color-surface-elevated);
  z-index: 1;
}

/* Show tooltip on hover */
.kb-wiki-link--has-tooltip:hover .kb-wiki-tooltip {
  opacity: 1;
  visibility: visible;
}

/* Tooltip content */
.kb-wiki-tooltip__header {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

.kb-wiki-tooltip__category {
  font-size: var(--text-xs);
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  font-weight: 500;
}

.kb-wiki-tooltip__name {
  font-size: var(--text-sm);
  color: var(--color-text-primary);
  font-weight: 500;
  line-height: 1.3;
  word-break: break-word;
}

.kb-wiki-tooltip__hint {
  margin-top: var(--space-2);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* Broken frontmatter pills */
.kb-entry-pill--broken {
  background-color: rgba(239, 68, 68, 0.1);
  border-color: var(--color-error);
  color: var(--color-error);
  opacity: 0.7;
}

.kb-entry-pill--broken:hover {
  background-color: rgba(239, 68, 68, 0.2);
  opacity: 0.9;
}

/* Tooltip positioning adjustment for edge cases */
.kb-browse-panel--preview .kb-wiki-tooltip {
  max-width: 220px;
}

/* Prevent tooltip from going off-screen (left edge) */
.kb-wiki-link--has-tooltip:first-child .kb-wiki-tooltip {
  left: 0;
  transform: translateX(0);
}

.kb-wiki-link--has-tooltip:first-child .kb-wiki-tooltip::after,
.kb-wiki-link--has-tooltip:first-child .kb-wiki-tooltip::before {
  left: 20px;
}

/* Entry Actions */
.kb-entry-actions {
  display: flex;
  gap: var(--space-2);
}

/* ==========================================
   KB MARKDOWN PREVIEW ENHANCEMENTS (Feature #70)
   ========================================== */

/* Code Blocks with Language Label */
.kb-code-block {
  position: relative;
  margin-bottom: var(--space-4);
}

.kb-code-lang {
  position: absolute;
  top: 0;
  right: 0;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface);
  border-left: 1px solid var(--color-border);
  border-bottom: 1px solid var(--color-border);
  border-radius: 0 var(--radius-md) 0 var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-transform: lowercase;
}

.kb-code-block pre {
  margin: 0;
  padding: var(--space-4);
  padding-top: var(--space-5);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
}

.kb-code-block pre code {
  font-family: var(--font-mono);
  font-size: var(--text-sm);
  line-height: 1.5;
  color: var(--color-text-primary);
  background: none;
  padding: 0;
}

/* Syntax Highlighting Colors (Dark Theme - Obsidian Style) */
.kb-hl-keyword {
  color: #c586c0;
  font-weight: 500;
}

.kb-hl-string {
  color: #ce9178;
}

.kb-hl-number {
  color: #b5cea8;
}

.kb-hl-comment {
  color: #6a9955;
  font-style: italic;
}

.kb-hl-property {
  color: #9cdcfe;
}

.kb-hl-tag {
  color: #569cd6;
}

.kb-hl-attr {
  color: #9cdcfe;
}

.kb-hl-selector {
  color: #d7ba7d;
}

/* Tables */
.kb-entry-content__body table,
.kb-table {
  width: 100%;
  margin-bottom: var(--space-4);
  border-collapse: collapse;
  font-size: var(--text-sm);
}

.kb-entry-content__body th,
.kb-entry-content__body td,
.kb-table th,
.kb-table td {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  text-align: left;
}

.kb-entry-content__body th,
.kb-table th {
  background-color: var(--color-surface-elevated);
  font-weight: 600;
  color: var(--color-text-primary);
}

.kb-entry-content__body tr:nth-child(even) td,
.kb-table tr:nth-child(even) td {
  background-color: var(--color-surface-sunken);
}

/* Task Lists */
.kb-task-item {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
  list-style: none;
  margin-left: calc(-1 * var(--space-5));
}

.kb-task-checkbox {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 16px;
  height: 16px;
  margin-top: 2px;
  border: 2px solid var(--color-border-strong);
  border-radius: var(--radius-sm);
  flex-shrink: 0;
}

.kb-task-checkbox--checked {
  background-color: var(--color-accent);
  border-color: var(--color-accent);
}

.kb-task-checkbox--checked::after {
  content: '';
  width: 6px;
  height: 10px;
  border: solid var(--color-bg);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg) translateY(-1px);
}

.kb-task-item--done {
  color: var(--color-text-tertiary);
  text-decoration: line-through;
}

/* Strikethrough */
.kb-entry-content__body del {
  color: var(--color-text-tertiary);
  text-decoration: line-through;
}

/* Images */
.kb-entry-image {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--space-2) 0;
}

/* Ordered Lists with custom numbering */
.kb-entry-content__body ol {
  counter-reset: none;
}

.kb-entry-content__body ol li[data-num] {
  list-style: none;
}

.kb-entry-content__body ol li[data-num]::before {
  content: attr(data-num) ".";
  margin-right: var(--space-2);
  color: var(--color-text-secondary);
  font-weight: 500;
}

/* Nested Lists */
.kb-entry-content__body ul ul,
.kb-entry-content__body ol ol,
.kb-entry-content__body ul ol,
.kb-entry-content__body ol ul {
  margin-top: var(--space-1);
  margin-bottom: var(--space-1);
}

/* Headings with hover anchor effect */
.kb-entry-content__body h1,
.kb-entry-content__body h2,
.kb-entry-content__body h3 {
  position: relative;
}

.kb-entry-content__body h1::before,
.kb-entry-content__body h2::before,
.kb-entry-content__body h3::before {
  content: '';
  position: absolute;
  left: -12px;
  top: 50%;
  transform: translateY(-50%);
  width: 4px;
  height: 0;
  background-color: var(--color-accent);
  border-radius: 2px;
  transition: height var(--duration-fast) var(--easing-default);
}

.kb-entry-content__body h1:hover::before {
  height: 24px;
}

.kb-entry-content__body h2:hover::before {
  height: 20px;
}

.kb-entry-content__body h3:hover::before {
  height: 16px;
}

/* First heading in content - no top margin */
.kb-entry-content__body>h1:first-child,
.kb-entry-content__body>h2:first-child,
.kb-entry-content__body>h3:first-child {
  margin-top: 0;
}

/* ==========================================
   KB ENTRY DETAIL CARD (Feature #61)
   ========================================== */

/* Back Button */
.kb-entry-back {
  display: inline-flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background-color: transparent;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
  margin-bottom: var(--space-4);
}

.kb-entry-back:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}

.kb-entry-back__icon {
  width: 16px;
  height: 16px;
}

/* Frontmatter Metadata Panel */
.kb-entry-frontmatter {
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  padding: var(--space-4);
  margin-bottom: var(--space-5);
}

.kb-entry-frontmatter__row {
  display: flex;
  align-items: flex-start;
  gap: var(--space-3);
  margin-bottom: var(--space-3);
}

.kb-entry-frontmatter__row:last-child {
  margin-bottom: 0;
}

.kb-entry-frontmatter__label {
  flex-shrink: 0;
  width: 70px;
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-text-tertiary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  padding-top: var(--space-1);
}

.kb-entry-frontmatter__value {
  flex: 1;
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

.kb-entry-frontmatter__type {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-accent-glow);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent);
  text-transform: capitalize;
}

/* Frontmatter Pills (for arrays like aliases, tags) */
.kb-entry-pills {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
}

.kb-entry-pill {
  display: inline-flex;
  align-items: center;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-entry-pill--link {
  cursor: pointer;
  color: var(--color-accent);
  border-color: var(--color-border-accent);
}

.kb-entry-pill--link:hover {
  background-color: var(--color-accent-glow);
  border-color: var(--color-accent);
}

.kb-entry-pill--tag {
  color: var(--color-accent-secondary);
}

/* Loading State */
.kb-entry-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-tertiary);
  gap: var(--space-3);
}

.kb-entry-loading__spinner {
  width: 32px;
  height: 32px;
  border: 3px solid var(--color-border);
  border-top-color: var(--color-accent);
  border-radius: 50%;
  animation: spin 0.8s linear infinite;
}

.kb-entry-loading__text {
  font-size: var(--text-sm);
}

/* Error State */
.kb-entry-error {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-10);
  text-align: center;
  color: var(--color-text-tertiary);
  gap: var(--space-3);
}

.kb-entry-error__icon {
  width: 48px;
  height: 48px;
  color: var(--color-error);
  opacity: 0.7;
}

.kb-entry-error__title {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-error);
}

.kb-entry-error__message {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  max-width: 300px;
}

/* ==========================================
   KB HEADER BAR (Feature #67)
   ========================================== */

.kb-header-bar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-4) var(--space-5);
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  margin-bottom: var(--space-4);
  gap: var(--space-4);
}

.kb-header-bar__left {
  display: flex;
  align-items: center;
  gap: var(--space-4);
}

.kb-header-bar__title {
  font-family: var(--font-display);
  font-size: var(--text-lg);
  font-weight: 600;
  color: var(--color-text-primary);
  white-space: nowrap;
}

.kb-header-bar__campaign {
  width: 200px;
}

.kb-header-bar__right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* ==========================================
   KB BUILD LAYOUT (Feature #67, #82: Flexbox responsive)
   ========================================== */

.kb-build-layout {
  display: flex;
  flex-direction: column;
  gap: var(--space-6);
  flex: 1;
  min-height: 0;
}

@media (min-width: 1024px) {

  /* Feature #82, #85: KB build layout uses flexbox with responsive sidebar width - reduced to ~25% */
  .kb-build-layout {
    flex-direction: row;
  }

  .kb-build-layout>aside {
    width: clamp(250px, 25vw, 400px);
    flex-shrink: 0;
    display: flex;
    flex-direction: column;
    min-height: 0;
  }

  .kb-build-layout>section {
    flex: 1;
    min-width: 0;
    display: flex;
    flex-direction: column;
    min-height: 0;
  }
}

/* ==========================================
   KB BROWSE THREE-PANEL LAYOUT (Feature #67, #82: Full-window flex fill)
   ========================================== */

.kb-browse-layout {
  display: flex;
  flex-direction: column;
  gap: 0;
  flex: 1;
  /* Feature #82: Fill available space in parent container */
  min-height: 400px;
  /* Minimum usable height */
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* Three Panel Container (Feature #72, #74, #81: Vertical fill alignment with Status pane) */
.kb-browse-panels {
  display: flex;
  flex: 1;
  min-height: 0;
  /* Critical: Allow container to shrink for scroll */
  overflow: hidden;
  align-items: stretch;
  /* Feature #81: Ensure all panels stretch to same height */
}

/* ==========================================
   KB BREADCRUMB NAVIGATION BAR (Feature #72)
   ========================================== */

.kb-breadcrumb-bar {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  padding: var(--space-2) var(--space-4);
  background-color: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

/* Back/Forward Navigation Buttons */
.kb-breadcrumb-nav {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}

.kb-nav-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-nav-btn:hover:not(:disabled) {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.kb-nav-btn:active:not(:disabled) {
  background-color: var(--color-surface-sunken);
}

.kb-nav-btn:disabled {
  color: var(--color-text-tertiary);
  cursor: not-allowed;
  opacity: 0.5;
}

.kb-nav-btn svg {
  width: 16px;
  height: 16px;
}

/* Breadcrumb Trail */
.kb-breadcrumb {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  flex: 1;
  min-width: 0;
  overflow: hidden;
}

.kb-breadcrumb-item {
  font-size: var(--text-sm);
  color: var(--color-text-secondary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  cursor: pointer;
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-sm);
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-breadcrumb-item:hover {
  color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.kb-breadcrumb-item--active {
  color: var(--color-text-primary);
  cursor: default;
}

.kb-breadcrumb-item--active:hover {
  color: var(--color-text-primary);
  background-color: transparent;
}

.kb-breadcrumb-sep {
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
  flex-shrink: 0;
}

.kb-breadcrumb-campaign {
  font-weight: 500;
  max-width: 200px;
}

.kb-breadcrumb-category {
  max-width: 150px;
}

.kb-breadcrumb-entry {
  max-width: 250px;
  color: var(--color-text-primary);
}

/* Responsive adjustments */
@media (max-width: 768px) {
  .kb-breadcrumb-bar {
    padding: var(--space-2) var(--space-3);
    gap: var(--space-2);
  }

  .kb-breadcrumb-campaign {
    max-width: 120px;
  }

  .kb-breadcrumb-category {
    max-width: 100px;
  }

  .kb-breadcrumb-entry {
    max-width: 150px;
  }
}

/* Panel Base Styles (Feature #74, #81: Vertical fill and independent scrolling) */
.kb-browse-panel {
  display: flex;
  flex-direction: column;
  min-width: 0;
  min-height: 0;
  /* Critical: Allow flexbox to shrink below content size for proper scroll */
  height: 100%;
  /* Feature #81: Ensure panel fills container height for bottom alignment */
  background-color: var(--color-surface);
  border-right: 1px solid var(--color-border);
  overflow: hidden;
  /* Prevent panel overflow, let content handle scrolling */
}

.kb-browse-panel:last-child {
  border-right: none;
}

/* Left Panel - Categories (Feature #83: Fixed ~150px, flex-shrink: 0 for stable width) */
.kb-browse-panel--folders {
  width: 300px;
  min-width: 200px;
  flex-shrink: 0;
  flex-grow: 0;
}

/* Middle Panel - Entry List (Feature #83: Fixed ~300px for better content display) */
.kb-browse-panel--entries {
  width: 300px;
  min-width: 200px;
  flex-shrink: 0;
  flex-grow: 0;
}

/* Right Panel - Preview (Feature #83: flex-grow fills remaining space, 1:2:flex ratio) */
.kb-browse-panel--preview {
  flex: 1 1 auto;
  min-width: 300px;
}

/* Panel Header */
.kb-browse-panel__header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
}

.kb-browse-panel__header--with-actions {
  padding-right: var(--space-3);
}

.kb-browse-panel__title {
  font-family: var(--font-display);
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-secondary);
  text-transform: uppercase;
  letter-spacing: 0.05em;
}

.kb-browse-panel__collapse {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-browse-panel__collapse:hover {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.kb-browse-panel__collapse svg {
  width: 16px;
  height: 16px;
}

/* Panel Content (Feature #74: Independent scrolling for each panel) */
.kb-browse-panel__content {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-3);
  min-height: 0;
  /* Critical for proper flexbox scroll behavior */
}

.kb-browse-panel__content--preview {
  padding: 0;
  display: flex;
  flex-direction: column;
  min-height: 0;
  /* Critical for nested flex scroll */
}

/* Resizable Dividers (Feature #81: Full height alignment) */
.kb-browse-divider {
  width: 4px;
  height: 100%;
  /* Feature #81: Match panel height */
  background-color: var(--color-border);
  cursor: col-resize;
  flex-shrink: 0;
  align-self: stretch;
  /* Feature #81: Stretch to container height */
  transition: background-color var(--duration-fast) var(--easing-default);
}

.kb-browse-divider:hover {
  background-color: var(--color-accent);
}

.kb-browse-divider--active {
  background-color: var(--color-accent);
}

/* Collapsed Panel State */
.kb-browse-panel--collapsed {
  width: 0 !important;
  min-width: 0 !important;
  overflow: hidden;
  border-right: none;
}

.kb-browse-panel--collapsed .kb-browse-panel__content,
.kb-browse-panel--collapsed .kb-browse-panel__header {
  display: none;
}

/* Empty States for Browse Panels */
.kb-browse-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
  text-align: center;
  color: var(--color-text-tertiary);
  height: 100%;
}

.kb-browse-empty__icon {
  width: 48px;
  height: 48px;
  margin-bottom: var(--space-3);
  opacity: 0.5;
}

.kb-browse-empty__text {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-1);
}

.kb-browse-empty__hint {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* Updated Entry List Styles for Three-Panel (Feature #74: Vertical fill) */
.kb-browse-panel--entries .kb-browser-search {
  margin-bottom: var(--space-3);
  flex-shrink: 0;
  /* Don't shrink the search box */
}

.kb-browse-panel--entries .kb-browse-panel__content {
  display: flex;
  flex-direction: column;
  min-height: 0;
  /* Enable flexbox scroll */
}

/* Feature #79: Center panel full vertical height */
.kb-browse-panel--entries .kb-browser-entries__list {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  /* Critical for scroll behavior */
  max-height: none;
  /* Override base 200px limit - match right panel behavior */
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
}

/* Updated Category List for Three-Panel */
.kb-browse-panel--folders .kb-browser-categories {
  margin-bottom: 0;
}

/* Categories Loading State (Feature #68) */
.kb-categories-loading {
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-4);
  color: var(--color-text-tertiary);
  font-size: var(--text-sm);
}

.loading-spinner--sm {
  width: 16px;
  height: 16px;
  border-width: 2px;
}

/* Expand/Collapse Toggle (Feature #68) */
.kb-categories-toggle {
  display: flex;
  justify-content: flex-end;
  padding: var(--space-2) 0;
  margin-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-border-subtle);
}

.kb-categories-toggle__btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  background: transparent;
  border: none;
  color: var(--color-text-tertiary);
  font-size: var(--text-xs);
  cursor: pointer;
  transition: color var(--duration-fast) var(--easing-default);
}

.kb-categories-toggle__btn:hover {
  color: var(--color-accent);
}

.kb-categories-toggle__btn svg {
  width: 14px;
  height: 14px;
}

/* Category scrollable area (Feature #68, #74) */
.kb-browse-panel--folders .kb-browse-panel__content {
  display: flex;
  flex-direction: column;
  min-height: 0;
  /* Allow flexbox to shrink below content size */
}

.kb-browse-panel--folders .kb-browser-categories {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  /* Enable proper scroll container behavior */
  /* Removed max-height constraint - let flexbox handle sizing */
}

/* Preview Panel Entry Viewer (Feature #74: Vertical fill and scroll) */
.kb-browse-panel--preview .kb-entry-header {
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  /* Don't shrink the header */
}

.kb-browse-panel--preview .kb-entry-content {
  flex: 1;
  overflow-y: auto;
  min-height: 0;
  /* Critical for scroll behavior */
}

/* Feature #74: Ensure preview empty state fills space */
.kb-browse-panel--preview .kb-browse-empty {
  flex: 1;
  min-height: 0;
}

/* Responsive Behavior */
@media (max-width: 1023px) {
  .kb-browse-layout {
    height: auto;
    min-height: 400px;
    flex-direction: column;
  }

  .kb-browse-panel--folders,
  .kb-browse-panel--entries,
  .kb-browse-panel--preview {
    width: 100%;
    max-width: none;
    min-width: 0;
    flex-shrink: 0;
    /* Feature #83: Reset for vertical stacking */
    flex-grow: 0;
  }

  .kb-browse-panel--folders {
    max-height: 200px;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .kb-browse-panel--entries {
    max-height: 250px;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .kb-browse-panel--preview {
    min-height: 300px;
    flex-grow: 1;
    /* Feature #83: Fill remaining vertical space on small screens */
  }

  .kb-browse-divider {
    display: none;
  }
}

@media (max-width: 767px) {
  .kb-header-bar {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }

  .kb-header-bar__left {
    flex-direction: column;
    align-items: stretch;
  }

  .kb-header-bar__campaign {
    width: 100%;
  }

  .kb-header-bar__right {
    justify-content: space-between;
  }

  .kb-browse-panel--folders {
    max-height: 150px;
  }
}

/* ==========================================
   KB TAB PANEL OVERRIDE (Feature #67, #82: Full-window flex fill)
   ========================================== */

/* Override tab-panel for KB - uses flex column to fill available space */
#kb-panel.tab-panel--active {
  display: flex;
  flex-direction: column;
  flex: 1;
  /* Feature #82: Fill available space */
  min-height: 0;
  /* Critical: Allow flexbox to shrink for proper scroll */
  overflow: hidden;
}

/* ==========================================
   KB ENTRY LIST PANEL (Feature #69)
   ========================================== */

/* Panel Header with Controls */
.kb-browse-panel__header--with-controls {
  flex-wrap: wrap;
  gap: var(--space-2);
}

.kb-browse-panel__header-left {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex: 1;
  min-width: 0;
}

.kb-browse-panel__header-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

/* Entry Count Badge */
.kb-browse-panel__count {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-sm);
  font-family: var(--font-mono);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  min-width: 24px;
}

/* Sort Controls */
.kb-entries-sort {
  display: flex;
  gap: 2px;
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
  padding: 2px;
}

.kb-entries-sort__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 28px;
  height: 28px;
  padding: 0;
  background-color: transparent;
  border: none;
  border-radius: var(--radius-sm);
  color: var(--color-text-tertiary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-entries-sort__btn:hover {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-secondary);
}

.kb-entries-sort__btn--active {
  background-color: var(--color-accent-glow);
  color: var(--color-accent);
}

.kb-entries-sort__btn--active:hover {
  background-color: var(--color-accent-glow);
  color: var(--color-accent);
}

.kb-entries-sort__btn svg {
  width: 16px;
  height: 16px;
}

/* Enhanced Entry Item */
.kb-browser-entry {
  display: flex;
  flex-direction: column;
  gap: var(--space-1);
  padding: var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-browser-entry:hover {
  background-color: var(--color-surface-elevated);
  border-color: var(--color-border-strong);
}

.kb-browser-entry--active {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.kb-browser-entry--active:hover {
  border-color: var(--color-accent);
  background-color: var(--color-accent-glow);
}

.kb-browser-entry__name {
  font-size: var(--text-sm);
  font-weight: 500;
  color: var(--color-text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  line-height: 1.4;
}

.kb-browser-entry--active .kb-browser-entry__name {
  color: var(--color-text-primary);
}

/* Entry Metadata Row */
.kb-browser-entry__meta {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  flex-wrap: wrap;
}

.kb-browser-entry__category {
  padding: 2px var(--space-2);
  background-color: var(--color-surface);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  text-transform: capitalize;
  flex-shrink: 0;
}

.kb-browser-entry--active .kb-browser-entry__category {
  background-color: var(--color-surface-elevated);
  color: var(--color-text-secondary);
}

.kb-browser-entry__timestamp {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  white-space: nowrap;
}

.kb-browser-entry--active .kb-browser-entry__timestamp {
  color: var(--color-text-secondary);
}

/* Entry metadata separator */
.kb-browser-entry__meta-sep {
  width: 3px;
  height: 3px;
  background-color: var(--color-text-tertiary);
  border-radius: 50%;
  opacity: 0.5;
}

/* Responsive Sort Controls */
@media (max-width: 1023px) {
  .kb-browse-panel__header--with-controls {
    padding: var(--space-2) var(--space-4);
  }

  .kb-entries-sort__btn {
    width: 32px;
    height: 32px;
  }

  .kb-entries-sort__btn svg {
    width: 18px;
    height: 18px;
  }
}

@media (max-width: 767px) {
  .kb-browse-panel__header--with-controls {
    flex-direction: column;
    align-items: stretch;
  }

  .kb-browse-panel__header-left {
    justify-content: space-between;
  }

  .kb-browse-panel__header-right {
    justify-content: flex-end;
  }
}

/* ==========================================
   KB GRAPH VISUALIZATION (Feature #60)
   ========================================== */

/* Category colors for graph nodes */
:root {
  --graph-color-player-characters: #4ecdc4;
  --graph-color-npcs: #f39c12;
  --graph-color-creatures: #e74c3c;
  --graph-color-locations: #27ae60;
  --graph-color-items: #9b59b6;
  --graph-color-history: #3498db;
  --graph-color-recent-history: #3498db;
  --graph-color-current-events: #e67e22;
  --graph-color-loose-ends: #c0392b;
  --graph-color-session-summaries: #95a5a6;
  --graph-color-campaign-summary: #f1c40f;
}

/* Graph Layout Container */
/* Feature #82: KB graph layout fills available space */
.kb-graph-layout {
  display: flex;
  flex-direction: column;
  flex: 1;
  /* Feature #82: Fill available space in parent container */
  min-height: 400px;
  /* Minimum usable height */
  background-color: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  overflow: hidden;
}

/* Graph Toolbar */
.kb-graph-toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface-elevated);
  border-bottom: 1px solid var(--color-border);
  flex-shrink: 0;
  gap: var(--space-4);
}

.kb-graph-toolbar__left {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

.kb-graph-toolbar__title {
  font-family: var(--font-display);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
}

.kb-graph-toolbar__stats {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-sm);
}

.kb-graph-toolbar__right {
  display: flex;
  align-items: center;
  gap: var(--space-3);
}

/* Graph Filter Dropdown */
.kb-graph-filter {
  position: relative;
}

.kb-graph-filter__toggle {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background-color: var(--color-surface-sunken);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  color: var(--color-text-secondary);
  font-family: var(--font-body);
  font-size: var(--text-sm);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-graph-filter__toggle:hover {
  background-color: var(--color-surface);
  border-color: var(--color-border-strong);
  color: var(--color-text-primary);
}

.kb-graph-filter__toggle svg {
  width: 16px;
  height: 16px;
}

.kb-graph-filter__dropdown {
  position: absolute;
  top: calc(100% + 4px);
  right: 0;
  min-width: 200px;
  padding: var(--space-2);
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  z-index: 100;
}

.kb-graph-filter__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2);
  border-radius: var(--radius-sm);
  cursor: pointer;
  transition: background-color var(--duration-fast) var(--easing-default);
}

.kb-graph-filter__item:hover {
  background-color: var(--color-surface-sunken);
}

.kb-graph-filter__item input[type="checkbox"] {
  accent-color: var(--color-accent);
}

.kb-graph-filter__item span {
  font-size: var(--text-sm);
  color: var(--color-text-primary);
}

.kb-graph-filter__color {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
  background-color: var(--filter-color);
}

.kb-graph-filter__divider {
  height: 1px;
  background-color: var(--color-border);
  margin: var(--space-2) 0;
}

/* Graph Search */
.kb-graph-search {
  position: relative;
  display: flex;
  align-items: center;
}

.kb-graph-search__icon {
  position: absolute;
  left: var(--space-3);
  width: 16px;
  height: 16px;
  color: var(--color-text-tertiary);
  pointer-events: none;
}

.kb-graph-search__input {
  padding-left: var(--space-10);
  width: 180px;
}

/* Zoom Controls */
.kb-graph-zoom {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1);
  background-color: var(--color-surface-sunken);
  border-radius: var(--radius-md);
}

.kb-graph-zoom__btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 32px;
  padding: 0;
  background-color: transparent;
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  color: var(--color-text-secondary);
  cursor: pointer;
  transition: all var(--duration-fast) var(--easing-default);
}

.kb-graph-zoom__btn:hover {
  background-color: var(--color-surface);
  border-color: var(--color-border);
  color: var(--color-text-primary);
}

.kb-graph-zoom__btn svg {
  width: 18px;
  height: 18px;
}

/* Graph Container */
.kb-graph-container {
  flex: 1;
  position: relative;
  overflow: hidden;
  background-color: var(--color-bg-primary);
}

/* Graph Loading State */
.kb-graph-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: var(--space-3);
  color: var(--color-text-tertiary);
}

/* Graph Empty State */
.kb-graph-empty {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  padding: var(--space-10);
  text-align: center;
}

.kb-graph-empty__icon {
  width: 64px;
  height: 64px;
  color: var(--color-text-tertiary);
  opacity: 0.5;
  margin-bottom: var(--space-4);
}

.kb-graph-empty__text {
  font-size: var(--text-base);
  font-weight: 500;
  color: var(--color-text-secondary);
  margin-bottom: var(--space-2);
}

.kb-graph-empty__hint {
  font-size: var(--text-sm);
  color: var(--color-text-tertiary);
  max-width: 300px;
}

/* Graph SVG */
.kb-graph-svg {
  width: 100%;
  height: 100%;
}

/* Graph Node Styles (D3 will add these classes) */
.kb-graph-svg .node circle {
  cursor: pointer;
  stroke-width: 2px;
  transition: stroke-width 0.2s ease, filter 0.2s ease;
}

.kb-graph-svg .node circle:hover {
  stroke-width: 3px;
  filter: brightness(1.2);
}

.kb-graph-svg .node.highlighted circle {
  stroke-width: 4px;
  filter: brightness(1.3) drop-shadow(0 0 8px currentColor);
}

.kb-graph-svg .node.dimmed circle {
  opacity: 0.3;
}

.kb-graph-svg .node.dimmed text {
  opacity: 0.3;
}

.kb-graph-svg .node text {
  font-family: var(--font-body);
  font-size: 11px;
  fill: var(--color-text-primary);
  pointer-events: none;
  text-anchor: middle;
  dominant-baseline: middle;
}

/* Graph Link Styles */
.kb-graph-svg .link {
  stroke: var(--color-border-strong);
  stroke-opacity: 0.6;
  fill: none;
  transition: stroke-opacity 0.2s ease, stroke-width 0.2s ease;
}

.kb-graph-svg .link.highlighted {
  stroke: var(--color-accent);
  stroke-opacity: 1;
  stroke-width: 2px;
}

.kb-graph-svg .link.dimmed {
  stroke-opacity: 0.1;
}

/* Graph Tooltip */
.kb-graph-tooltip {
  position: absolute;
  padding: var(--space-3);
  background-color: var(--color-surface-elevated);
  border: 1px solid var(--color-border-strong);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-lg);
  pointer-events: none;
  z-index: 1000;
  min-width: 150px;
  max-width: 250px;
}

.kb-graph-tooltip__category {
  display: inline-block;
  padding: var(--space-1) var(--space-2);
  background-color: var(--color-accent-glow);
  border: 1px solid var(--color-border-accent);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  color: var(--color-accent);
  text-transform: uppercase;
  letter-spacing: 0.05em;
  margin-bottom: var(--space-2);
}

.kb-graph-tooltip__name {
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-primary);
  margin-bottom: var(--space-1);
}

.kb-graph-tooltip__connections {
  font-size: var(--text-xs);
  color: var(--color-text-tertiary);
}

/* Graph Legend */
.kb-graph-legend {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-4);
  padding: var(--space-3) var(--space-4);
  background-color: var(--color-surface-elevated);
  border-top: 1px solid var(--color-border);
  flex-shrink: 0;
}

.kb-graph-legend__item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  cursor: pointer;
  opacity: 1;
  transition: opacity var(--duration-fast) var(--easing-default);
}

.kb-graph-legend__item:hover {
  opacity: 0.8;
}

.kb-graph-legend__item.disabled {
  opacity: 0.4;
}

.kb-graph-legend__color {
  display: inline-block;
  width: 12px;
  height: 12px;
  border-radius: 50%;
}

.kb-graph-legend__label {
  font-size: var(--text-xs);
  color: var(--color-text-secondary);
}

/* Responsive Graph Layout */
@media (max-width: 767px) {
  .kb-graph-toolbar {
    flex-direction: column;
    align-items: stretch;
    gap: var(--space-3);
  }

  .kb-graph-toolbar__left,
  .kb-graph-toolbar__right {
    justify-content: center;
    flex-wrap: wrap;
  }

  .kb-graph-search__input {
    width: 140px;
  }

  .kb-graph-legend {
    justify-content: center;
  }
}

/* ==========================================
   FEATURE #84: RESPONSIVE BREAKPOINTS & TOUCH TARGETS
   ========================================== */

/*
 * Touch-friendly minimum tap target size (44x44px per WCAG 2.1)
 * Applied to all interactive elements for mobile/tablet use
 */

/* Base touch target size - always ensure 44px minimum on touch devices */
@media (pointer: coarse) {

  /* Buttons */
  .btn {
    min-height: 44px;
    min-width: 44px;
  }

  .btn--sm {
    min-height: 44px;
    min-width: 44px;
    padding: var(--space-2) var(--space-3);
  }

  /* Tab navigation */
  .tab-nav__tab {
    min-height: 44px;
    padding: var(--space-3) var(--space-4);
  }

  /* Form inputs and selects */
  .form-input,
  .form-select {
    min-height: 44px;
    padding: var(--space-3);
  }

  /* Checkboxes need larger touch target */
  .form-checkbox {
    min-height: 44px;
    display: flex;
    align-items: center;
  }

  /* KB browser category items */
  .kb-browser-category {
    min-height: 44px;
    padding: var(--space-3);
  }

  /* KB browser entry items */
  .kb-browser-entry {
    min-height: 44px;
    padding: var(--space-3);
  }

  /* Mode toggle buttons */
  .kb-mode-toggle__btn {
    min-height: 44px;
    min-width: 44px;
  }

  /* Sort buttons */
  .kb-entries-sort__btn {
    min-height: 44px;
    min-width: 44px;
  }

  /* Collapse buttons */
  .kb-browse-panel__collapse {
    min-height: 44px;
    min-width: 44px;
  }

  /* Graph toolbar buttons */
  .kb-graph-btn {
    min-height: 44px;
    min-width: 44px;
  }

  /* KB navigation buttons */
  .kb-nav-btn {
    min-height: 44px;
    min-width: 44px;
  }

  /* Campaign items */
  .campaign-item__header {
    min-height: 44px;
  }

  .session-item {
    min-height: 44px;
  }

  /* Merge file items */
  .file-item {
    min-height: 44px;
  }
}

/* Smooth layout transitions for breakpoint changes */
.app-container,
.main-content,
.tab-panel,
.tab-panel--active,
.kb-browse-layout,
.kb-browse-panels,
.kb-browse-panel,
.kb-browse-panel--folders,
.kb-browse-panel--entries,
.kb-browse-panel--preview,
.kb-build-layout,
.panel {
  transition:
    width var(--duration-normal) var(--easing-default),
    height var(--duration-normal) var(--easing-default),
    max-width var(--duration-normal) var(--easing-default),
    max-height var(--duration-normal) var(--easing-default),
    flex var(--duration-normal) var(--easing-default),
    padding var(--duration-fast) var(--easing-default);
}

/* Respect reduced motion preference */
@media (prefers-reduced-motion: reduce) {

  .app-container,
  .main-content,
  .tab-panel,
  .tab-panel--active,
  .kb-browse-layout,
  .kb-browse-panels,
  .kb-browse-panel,
  .kb-browse-panel--folders,
  .kb-browse-panel--entries,
  .kb-browse-panel--preview,
  .kb-build-layout,
  .panel {
    transition: none;
  }
}

/* ===========================================
   TABLET BREAKPOINT (~1024px)
   Panels reduce widths gracefully, KB panels stack
   =========================================== */

@media (max-width: 1024px) {

  /* Reduce app padding on tablet */
  .app-container {
    padding: var(--space-4);
  }

  /* Header adjustments */
  .header__title {
    font-size: var(--text-xl);
  }

  /* Main content stacks vertically */
  .main-content {
    flex-direction: column;
  }

  /* Tab panels stack */
  .tab-panel--active {
    flex-direction: column;
  }

  /* Sidebar takes full width on tablet */
  .tab-panel--active>aside {
    width: 100%;
    max-width: none;
  }

  /* Content section full width */
  .tab-panel--active>section {
    width: 100%;
  }

  /* KB browse panels stack vertically (already handled, ensuring consistency) */
  .kb-browse-panels {
    flex-direction: column;
  }

  /* KB panels take full width when stacked */
  .kb-browse-panel--folders,
  .kb-browse-panel--entries,
  .kb-browse-panel--preview {
    width: 100%;
    max-width: none;
    min-width: 0;
  }

  .kb-browse-panel--folders {
    max-height: 200px;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .kb-browse-panel--entries {
    max-height: 250px;
    border-right: none;
    border-bottom: 1px solid var(--color-border);
  }

  .kb-browse-panel--preview {
    min-height: 300px;
    flex-grow: 1;
  }

  /* Results toolbar wraps */
  .results-toolbar {
    flex-wrap: wrap;
    gap: var(--space-3);
  }

  .results-toolbar__info {
    width: 100%;
    text-align: center;
    padding-bottom: var(--space-2);
    border-bottom: 1px solid var(--color-border-subtle);
  }

  .results-toolbar__actions {
    width: 100%;
    justify-content: center;
    flex-wrap: wrap;
    gap: var(--space-2);
  }
}

/* ===========================================
   MOBILE BREAKPOINT (~768px)
   Full vertical stacking, optimized for single column
   =========================================== */

@media (max-width: 768px) {

  /* Further reduce padding on mobile */
  .app-container {
    padding: var(--space-3);
    gap: var(--space-3);
  }

  /* Smaller header */
  .header {
    padding-bottom: var(--space-3);
    margin-bottom: var(--space-3);
  }

  .header__title {
    font-size: var(--text-lg);
  }

  .header__subtitle {
    font-size: var(--text-xs);
  }

  /* Tab navigation - horizontal scroll with smaller tabs */
  .tab-nav {
    gap: var(--space-1);
    margin-bottom: var(--space-3);
    -webkit-overflow-scrolling: touch;
    /* Smooth scroll on iOS */
  }

  .tab-nav__tab {
    padding: var(--space-2) var(--space-3);
    font-size: var(--text-xs);
    gap: var(--space-1);
  }

  .tab-nav__icon {
    width: 16px;
    height: 16px;
  }

  /* Main content gaps */
  .main-content {
    gap: var(--space-3);
  }

  /* Panel adjustments */
  .panel__header {
    padding: var(--space-3) var(--space-4);
  }

  .panel__content {
    padding: var(--space-3);
  }

  .panel__title {
    font-size: var(--text-xs);
  }

  /* Form adjustments */
  .form-group {
    margin-bottom: var(--space-3);
  }

  .settings-form {
    margin-top: var(--space-4);
  }

  /* KB browse - full vertical stacking with defined heights */
  .kb-browse-layout {
    flex-direction: column;
    height: auto;
    max-height: none;
  }

  .kb-browse-panels {
    flex-direction: column;
  }

  .kb-browse-panel--folders {
    width: 100%;
    max-height: 120px;
    min-height: 100px;
  }

  .kb-browse-panel--entries {
    width: 100%;
    max-height: 180px;
    min-height: 150px;
  }

  .kb-browse-panel--preview {
    width: 100%;
    min-height: 250px;
    flex: 1;
  }

  .kb-browse-panel__header {
    padding: var(--space-2) var(--space-3);
  }

  .kb-browse-panel__title {
    font-size: 10px;
    /* Slightly smaller for mobile */
  }

  .kb-browse-panel__content {
    padding: var(--space-2);
  }

  /* KB header bar stacks */
  .kb-header-bar {
    flex-direction: column;
    gap: var(--space-2);
    align-items: stretch;
  }

  .kb-campaign-selector {
    width: 100%;
  }

  .kb-mode-toggle {
    justify-content: center;
  }

  /* KB build layout */
  .kb-build-layout {
    flex-direction: column;
  }

  .kb-build-sidebar {
    width: 100%;
  }

  /* Merge file list */
  .file-list {
    max-height: 200px;
  }

  /* Merge preview */
  .merge-preview-summary {
    flex-direction: column;
    gap: var(--space-3);
  }

  /* Campaign list */
  .campaign-tree {
    max-height: 250px;
  }

  /* Action buttons in cards */
  .session-detail__actions {
    flex-wrap: wrap;
    gap: var(--space-2);
  }

  .session-detail__actions .btn {
    flex: 1 1 auto;
    min-width: 120px;
  }
}

/* ===========================================
   SMALL MOBILE BREAKPOINT (~480px)
   Extra compact layout for very small screens
   =========================================== */

@media (max-width: 480px) {
  .app-container {
    padding: var(--space-2);
  }

  .header__title {
    font-size: var(--text-base);
  }

  /* Single-column action buttons */
  .results-toolbar__actions {
    flex-direction: column;
  }

  .results-toolbar__actions .btn {
    width: 100%;
  }

  /* KB panels even more compact */
  .kb-browse-panel--folders {
    max-height: 100px;
  }

  .kb-browse-panel--entries {
    max-height: 150px;
  }

  /* Smaller upload zone */
  .upload-zone {
    padding: var(--space-4);
  }

  .upload-zone__icon {
    width: 36px;
    height: 36px;
  }

  .upload-zone__text {
    font-size: var(--text-sm);
  }

  /* Compact mode toggle */
  .kb-mode-toggle__btn {
    padding: var(--space-2);
    font-size: var(--text-xs);
  }

  .kb-mode-toggle__btn svg {
    width: 14px;
    height: 14px;
  }
}

/* ==========================================
   UTILITY CLASSES
   ========================================== */

.hidden {
  display: none !important;
}

.sr-only {
  position: absolute;
  width: 1px;
  height: 1px;
  padding: 0;
  margin: -1px;
  overflow: hidden;
  clip: rect(0, 0, 0, 0);
  white-space: nowrap;
  border-width: 0;
}

/* KB Error States */
.kb-status-badge--processing {
  background-color: var(--color-accent-glow);
  color: var(--color-accent);
  animation: pulse 2s infinite;
}

.kb-manifest-item--error {
  border-left: 3px solid var(--color-error);
  background-color: rgba(239, 68, 68, 0.05);
}

.kb-manifest-item__error-badge {
  display: inline-flex;
  align-items: center;
  padding: 2px 6px;
  background-color: rgba(239, 68, 68, 0.1);
  color: var(--color-error);
  border-radius: var(--radius-sm);
  font-size: var(--text-xs);
  font-weight: 500;
  cursor: help;
}

@keyframes pulse {
  0% {
    opacity: 1;
  }

  50% {
    opacity: 0.6;
  }

  100% {
    opacity: 1;
  }
}