/* CollabMD Design Tokens & Styles */

/* ===== TYPE SCALE ===== */
:root {
  --text-xs:   clamp(0.75rem,  0.7rem  + 0.25vw, 0.875rem);
  --text-sm:   clamp(0.875rem, 0.8rem  + 0.35vw, 1rem);
  --text-base: clamp(1rem,     0.9rem  + 0.5vw,  1.125rem);
  --text-lg:   clamp(1.125rem, 0.95rem + 0.85vw, 1.5rem);
  --text-xl:   clamp(1.5rem,   1rem    + 1.5vw,  2.25rem);
  --text-2xl:  clamp(2rem,     1.2rem  + 2.5vw,  3.5rem);

  /* Fonts */
  --font-body: 'Inter', system-ui, sans-serif;
  --font-display: 'Inter', system-ui, sans-serif;
  --font-mono: 'JetBrains Mono', 'Fira Code', monospace;

  /* ===== SPACING (4px base) ===== */
  --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;
  --space-16: 4rem;
  --space-20: 5rem;
  --space-24: 6rem;
  --space-32: 8rem;

  /* Radius */
  --radius-sm: 0.375rem;
  --radius-md: 0.5rem;
  --radius-lg: 0.75rem;
  --radius-xl: 1rem;
  --radius-full: 9999px;

  /* Transitions */
  --transition-interactive: 180ms cubic-bezier(0.16, 1, 0.3, 1);

  /* Content widths */
  --content-narrow: 640px;
  --content-default: 960px;
  --content-wide: 1200px;

  /* Toolbar height */
  --toolbar-h: 48px;
}

/* ===== COLOR PALETTE ===== */

/* LIGHT MODE */
:root, [data-theme="light"] {
  --color-bg:               #f5f5f7;
  --color-surface:          #ffffff;
  --color-surface-2:        #fafafe;
  --color-surface-offset:   #eeeef2;
  --color-surface-offset-2: #e6e6eb;
  --color-surface-dynamic:  #dddde3;
  --color-divider:          #d1d1d8;
  --color-border:           #c4c4ce;

  --color-text:           #1a1a2e;
  --color-text-muted:     #6b6b80;
  --color-text-faint:     #a0a0b0;
  --color-text-inverse:   #f5f5f7;

  --color-primary:          #4f46e5;
  --color-primary-hover:    #4338ca;
  --color-primary-active:   #3730a3;
  --color-primary-highlight: #e0e0ff;

  --color-error:          #dc2626;
  --color-error-highlight: #fce8e8;
  --color-success:          #16a34a;
  --color-success-highlight: #dcfce7;
  --color-warning:          #d97706;
  --color-warning-highlight: #fef3c7;

  --shadow-sm: 0 1px 2px oklch(0.2 0.02 260 / 0.06);
  --shadow-md: 0 4px 12px oklch(0.2 0.02 260 / 0.08);
  --shadow-lg: 0 12px 32px oklch(0.2 0.02 260 / 0.12);
}

/* DARK MODE (default) */
[data-theme="dark"] {
  --color-bg:               #0f1117;
  --color-surface:          #161822;
  --color-surface-2:        #1c1e2c;
  --color-surface-offset:   #1a1c28;
  --color-surface-offset-2: #22243a;
  --color-surface-dynamic:  #2a2c3e;
  --color-divider:          #2e3044;
  --color-border:           #383a50;

  --color-text:           #e2e2ea;
  --color-text-muted:     #8b8ba0;
  --color-text-faint:     #5a5a70;
  --color-text-inverse:   #0f1117;

  --color-primary:          #818cf8;
  --color-primary-hover:    #6366f1;
  --color-primary-active:   #4f46e5;
  --color-primary-highlight: #1e1e3a;

  --color-error:          #f87171;
  --color-error-highlight: #2a1a1a;
  --color-success:          #4ade80;
  --color-success-highlight: #1a2a1a;
  --color-warning:          #fbbf24;
  --color-warning-highlight: #2a261a;

  --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
  --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
  --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.5);
}

@media (prefers-color-scheme: dark) {
  :root:not([data-theme]) {
    --color-bg:               #0f1117;
    --color-surface:          #161822;
    --color-surface-2:        #1c1e2c;
    --color-surface-offset:   #1a1c28;
    --color-surface-offset-2: #22243a;
    --color-surface-dynamic:  #2a2c3e;
    --color-divider:          #2e3044;
    --color-border:           #383a50;
    --color-text:           #e2e2ea;
    --color-text-muted:     #8b8ba0;
    --color-text-faint:     #5a5a70;
    --color-text-inverse:   #0f1117;
    --color-primary:          #818cf8;
    --color-primary-hover:    #6366f1;
    --color-primary-active:   #4f46e5;
    --color-primary-highlight: #1e1e3a;
    --color-error:          #f87171;
    --color-error-highlight: #2a1a1a;
    --color-success:          #4ade80;
    --color-success-highlight: #1a2a1a;
    --color-warning:          #fbbf24;
    --color-warning-highlight: #2a261a;
    --shadow-sm: 0 1px 2px oklch(0 0 0 / 0.25);
    --shadow-md: 0 4px 12px oklch(0 0 0 / 0.35);
    --shadow-lg: 0 12px 32px oklch(0 0 0 / 0.5);
  }
}


/* ===== SHARED COMPONENTS ===== */

.hidden { display: none !important; }

.btn {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-4);
  border-radius: var(--radius-md);
  font-size: var(--text-sm);
  font-weight: 500;
  transition: all var(--transition-interactive);
  cursor: pointer;
  white-space: nowrap;
  border: none;
  text-decoration: none;
}
.btn:active { transform: scale(0.97); }

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

.btn-secondary {
  background: var(--color-surface-2);
  color: var(--color-text);
  border: 1px solid var(--color-border);
}
.btn-secondary:hover { background: var(--color-surface-dynamic); }

.btn-danger {
  background: var(--color-error);
  color: var(--color-text-inverse);
}
.btn-danger:hover { filter: brightness(0.95); }

.btn-ghost {
  background: transparent;
  color: var(--color-text-muted);
  padding: var(--space-2);
}
.btn-ghost:hover { color: var(--color-text); background: var(--color-surface-offset); }

.btn-lg {
  padding: var(--space-3) var(--space-6);
  font-weight: 600;
}

.input {
  padding: var(--space-2) var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface);
  font-size: var(--text-sm);
  color: var(--color-text);
  transition: border-color var(--transition-interactive);
  width: 100%;
}
.input:focus {
  outline: none;
  border-color: var(--color-primary);
  box-shadow: 0 0 0 3px oklch(from var(--color-primary) l c h / 0.15);
}
.input::placeholder { color: var(--color-text-faint); }


/* ===== LOADING STATE ===== */

.editor-loading {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  height: 100%;
  gap: var(--space-3);
  color: var(--color-text-faint);
}
.editor-loading.hidden { display: none; }

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

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


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

.app-shell {
  display: flex;
  height: 100dvh;
  overflow: hidden;
}

/* ===== SIDEBAR ===== */

.sidebar {
  width: 260px;
  min-width: 260px;
  max-width: 260px;
  background: var(--color-surface);
  border-right: 1px solid var(--color-divider);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 180ms cubic-bezier(0.16, 1, 0.3, 1), min-width 180ms cubic-bezier(0.16, 1, 0.3, 1);
}

.sidebar.collapsed {
  width: 0;
  min-width: 0;
  border-right: none;
  overflow: hidden;
}

.sidebar-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-3) var(--space-3);
  border-bottom: 1px solid var(--color-divider);
  min-height: var(--toolbar-h);
  gap: var(--space-2);
}

.sidebar-brand {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.sidebar-title {
  font-size: var(--text-sm);
  font-weight: 700;
  letter-spacing: -0.02em;
  white-space: nowrap;
}

.sidebar-actions {
  display: flex;
  gap: 2px;
}

.sidebar-action-btn {
  background: none;
  border: none;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  color: var(--color-text-muted);
  cursor: pointer;
  display: inline-flex;
  align-items: center;
  justify-content: center;
  transition: color var(--transition-interactive), background var(--transition-interactive);
}

.sidebar-action-btn:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

.sidebar-close-btn {
  display: none;
}

.sidebar-search {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-divider);
}

.sidebar-search-input {
  width: 100%;
  background: var(--color-surface-offset);
  border: 1px solid transparent;
  border-radius: var(--radius-sm);
  padding: var(--space-1) var(--space-2);
  font-size: var(--text-xs);
  color: var(--color-text);
  outline: none;
  transition: border-color var(--transition-interactive);
}

.sidebar-search-input::placeholder {
  color: var(--color-text-faint);
}

.sidebar-search-input:focus {
  border-color: var(--color-primary);
}

/* File tree */

.file-tree {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-2) 0;
}

.file-tree-empty {
  padding: var(--space-4) var(--space-3);
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  text-align: center;
}

.file-tree-item {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  width: 100%;
  padding: 4px 8px;
  border: none;
  background: none;
  font-size: 13px;
  font-family: var(--font-body);
  color: var(--color-text-muted);
  cursor: pointer;
  text-align: left;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  border-radius: 0;
  transition: background var(--transition-interactive), color var(--transition-interactive);
}

.file-tree-item:hover {
  background: var(--color-surface-offset);
  color: var(--color-text);
}

.file-tree-file.active {
  background: var(--color-primary-highlight);
  color: var(--color-primary);
}

.file-tree-chevron {
  flex-shrink: 0;
  transition: transform 120ms ease;
}

.file-tree-chevron.expanded {
  transform: rotate(90deg);
}

.file-tree-icon {
  flex-shrink: 0;
  opacity: 0.5;
}

.file-tree-name {
  overflow: hidden;
  text-overflow: ellipsis;
}

.file-tree-children {
  /* Children indentation handled by paddingLeft on items */
}

/* Context menu */

.file-context-menu {
  position: fixed;
  z-index: 1000;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  box-shadow: var(--shadow-md);
  padding: var(--space-1);
  min-width: 120px;
}

.file-context-item {
  display: block;
  width: 100%;
  padding: var(--space-1) var(--space-3);
  border: none;
  background: none;
  font-size: 13px;
  font-family: var(--font-body);
  color: var(--color-text);
  cursor: pointer;
  text-align: left;
  border-radius: var(--radius-sm);
  transition: background var(--transition-interactive);
}

.file-context-item:hover {
  background: var(--color-surface-offset);
}

.file-context-danger {
  color: var(--color-error);
}

/* Wiki-link */

.wiki-link {
  color: var(--color-primary);
  text-decoration: underline;
  text-decoration-style: dotted;
  text-underline-offset: 2px;
  cursor: pointer;
}

.wiki-link:hover {
  text-decoration-style: solid;
}

.wiki-link-new {
  color: var(--color-text-muted);
  text-decoration-style: dashed;
  opacity: 0.7;
}

.wiki-link-new:hover {
  color: var(--color-primary);
  opacity: 1;
  text-decoration-style: dashed;
}

/* ===== MAIN AREA ===== */

.main-area {
  flex: 1;
  display: flex;
  flex-direction: column;
  overflow: hidden;
  min-width: 0;
}

/* ===== EMPTY STATE ===== */

.empty-state {
  flex: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  padding: var(--space-8);
}

.empty-state-content {
  text-align: center;
  max-width: 320px;
}

.empty-state-content svg {
  margin-bottom: var(--space-4);
  opacity: 0.5;
}

.empty-state-title {
  font-size: var(--text-lg);
  font-weight: 600;
  margin-bottom: var(--space-2);
  letter-spacing: -0.02em;
}

.empty-state-desc {
  font-size: var(--text-sm);
  color: var(--color-text-muted);
  line-height: 1.5;
}


/* ===== EDITOR PAGE ===== */

.editor-page {
  display: flex;
  flex-direction: column;
  flex: 1;
  overflow: hidden;
}

/* Toolbar */
.toolbar {
  display: flex;
  align-items: center;
  justify-content: space-between;
  height: var(--toolbar-h);
  padding: 0 var(--space-3);
  background: var(--color-surface);
  border-bottom: 1px solid var(--color-divider);
  flex-shrink: 0;
  z-index: 10;
  gap: var(--space-2);
}

.toolbar-left,
.toolbar-right {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.toolbar-left {
  min-width: 0;
  flex: 1;
}
.toolbar-right {
  flex-shrink: 0;
}

.toolbar-logo {
  display: flex;
  align-items: center;
  padding: var(--space-1);
  border-radius: var(--radius-sm);
  transition: background var(--transition-interactive);
  flex-shrink: 0;
}
.toolbar-logo:hover {
  background: var(--color-surface-offset);
}

.toolbar-room-info {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  min-width: 0;
}
.toolbar-room-name {
  font-size: var(--text-sm);
  font-weight: 600;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.toolbar-badge {
  font-size: 11px;
  font-weight: 500;
  padding: 2px var(--space-2);
  border-radius: var(--radius-full);
  background: var(--color-primary-highlight);
  color: var(--color-primary);
  white-space: nowrap;
  flex-shrink: 0;
}

.toolbar-center {
  flex-shrink: 0;
}

.view-toggle {
  display: flex;
  background: var(--color-surface-offset);
  border-radius: var(--radius-md);
  padding: 2px;
  gap: 2px;
}
.view-btn {
  display: flex;
  align-items: center;
  justify-content: center;
  width: 32px;
  height: 28px;
  border-radius: var(--radius-sm);
  color: var(--color-text-faint);
  transition: all var(--transition-interactive);
}
.view-btn:hover {
  color: var(--color-text-muted);
}
.view-btn.active {
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-sm);
}

.toolbar-btn {
  display: flex;
  align-items: center;
  gap: var(--space-1);
  padding: var(--space-1) var(--space-2);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
}
.toolbar-btn-label {
  font-size: var(--text-xs);
}
.toolbar-name-btn {
  max-width: 132px;
}
.toolbar-user-name {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

/* Mobile view toggle — hidden on desktop */
.mobile-view-toggle {
  display: none;
}

.user-avatars {
  display: flex;
  align-items: center;
}
.user-avatar {
  width: 24px;
  height: 24px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 11px;
  font-weight: 600;
  color: white;
  border: 2px solid var(--color-surface);
  margin-left: -4px;
  position: relative;
  z-index: 1;
  flex-shrink: 0;
}
.user-avatar-initial {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  line-height: 1;
}
.user-avatar:first-child {
  margin-left: 0;
}
.user-avatar.is-local {
  width: auto;
  min-width: 44px;
  padding: 0 8px 0 6px;
  gap: 4px;
  border-radius: var(--radius-full);
  margin-right: 6px;
  box-shadow:
    0 0 0 2px var(--color-surface),
    0 0 0 4px oklch(from var(--color-primary) l c h / 0.18);
  z-index: 5;
}
.user-avatar.is-local + .user-avatar {
  margin-left: 0;
}
.user-avatar.is-local .user-avatar-initial {
  width: 14px;
  height: 14px;
  border-radius: var(--radius-full);
  background: rgb(255 255 255 / 0.22);
  font-size: 9px;
}
.user-avatar-self-label {
  font-size: 9px;
  font-weight: 700;
  letter-spacing: 0.04em;
  line-height: 1;
  text-transform: uppercase;
}
.user-avatar-button {
  cursor: pointer;
  padding: 0;
  transition: transform var(--transition-interactive), box-shadow var(--transition-interactive);
}
.user-avatar-button:hover {
  transform: translateY(-1px);
  z-index: 2;
}
.user-avatar-button:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px var(--color-bg), 0 0 0 4px oklch(from var(--color-primary) l c h / 0.45);
  z-index: 3;
}
.user-avatar.is-following {
  box-shadow: 0 0 0 2px var(--color-primary), 0 0 0 4px oklch(from var(--color-primary) l c h / 0.2);
  z-index: 4;
}
.user-avatar-button.different-file {
  opacity: 0.55;
}
.user-avatar-button.different-file:hover {
  opacity: 0.85;
}

.chat-container {
  position: relative;
}

.chat-toggle-btn {
  position: relative;
}

.chat-toggle-btn.is-active {
  color: var(--color-text);
  background: var(--color-surface-offset);
}

.chat-toggle-badge {
  min-width: 18px;
  height: 18px;
  padding: 0 5px;
  border-radius: var(--radius-full);
  background: var(--color-primary);
  color: var(--color-text-inverse);
  font-size: 10px;
  font-weight: 700;
  line-height: 18px;
  text-align: center;
}

.chat-panel {
  position: absolute;
  top: calc(100% + var(--space-2));
  right: 0;
  width: min(360px, calc(100vw - var(--space-6)));
  max-height: min(70vh, 520px);
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  padding: var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  background: oklch(from var(--color-surface) l c h / 0.98);
  box-shadow: var(--shadow-lg);
  backdrop-filter: blur(14px);
  z-index: 30;
}

.chat-panel-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}

.chat-panel-title {
  margin: 0;
  font-size: var(--text-sm);
  font-weight: 700;
}

.chat-panel-status {
  margin: var(--space-1) 0 0;
  font-size: 11px;
  color: var(--color-text-muted);
}

.chat-alert-btn {
  flex-shrink: 0;
  padding: 6px 10px;
  font-size: 11px;
}

.chat-alert-btn.is-enabled {
  border-color: oklch(from var(--color-success) l c h / 0.45);
  color: var(--color-success);
  background: oklch(from var(--color-success) l c h / 0.12);
}

.chat-alert-btn.is-blocked {
  color: var(--color-warning);
}

.chat-empty-state {
  padding: var(--space-4);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  font-size: 12px;
  color: var(--color-text-muted);
  background: var(--color-surface-2);
}

.chat-messages {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
  overflow-y: auto;
  padding-right: var(--space-1);
  min-height: 140px;
  max-height: 320px;
}

.chat-message {
  display: flex;
  align-items: flex-start;
  gap: var(--space-2);
}

.chat-message.is-local {
  flex-direction: row-reverse;
}

.chat-message-avatar {
  width: 28px;
  height: 28px;
  border-radius: var(--radius-full);
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  font-size: 12px;
  font-weight: 700;
  flex-shrink: 0;
}

.chat-message-body {
  min-width: 0;
  flex: 1;
  display: flex;
  flex-direction: column;
  align-items: flex-start;
}

.chat-message.is-local .chat-message-body {
  align-items: flex-end;
}

.chat-message-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 6px;
  margin-bottom: 4px;
}

.chat-message.is-local .chat-message-meta {
  justify-content: flex-end;
}

.chat-message-author {
  font-size: 12px;
  font-weight: 600;
  color: var(--color-text);
}

.chat-message-time,
.chat-message-file {
  font-size: 10px;
  color: var(--color-text-muted);
}

.chat-message-file {
  padding: 2px 6px;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
}

.chat-message-text {
  margin: 0;
  padding: 10px 12px;
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  border: 1px solid var(--color-divider);
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.45;
  word-break: break-word;
  width: fit-content;
  max-width: 78%;
}

.chat-message.is-local .chat-message-text {
  background: oklch(from var(--color-primary) l c h / 0.14);
  border-color: oklch(from var(--color-primary) l c h / 0.25);
}

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

.chat-input {
  font-size: 13px;
}

.chat-send-btn {
  flex-shrink: 0;
  padding-inline: var(--space-4);
}

.app-dialog {
  width: min(420px, calc(100vw - var(--space-6)));
  margin: auto;
  padding: 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-xl);
  background: var(--color-surface);
  color: var(--color-text);
  box-shadow: var(--shadow-lg);
}
.app-dialog::backdrop {
  background: oklch(from var(--color-bg) l c h / 0.72);
  backdrop-filter: blur(6px);
}
.app-dialog-form {
  display: grid;
  gap: var(--space-4);
  padding: var(--space-5);
}
.app-dialog-header {
  display: grid;
  gap: var(--space-1);
}
.app-dialog-title {
  font-size: var(--text-base);
  font-weight: 600;
}
.app-dialog-copy {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
}
.app-dialog-field {
  display: grid;
  gap: var(--space-2);
}
.app-dialog-label {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.08em;
}
.app-dialog-hint {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  line-height: 1.5;
}
.app-dialog-note {
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
  color: var(--color-text);
  font-family: ui-monospace, SFMono-Regular, Menlo, Consolas, monospace;
  font-size: var(--text-xs);
  line-height: 1.6;
  overflow-wrap: anywhere;
  padding: var(--space-3);
}
.app-dialog-note.is-danger {
  background: var(--color-error-highlight);
  border-color: oklch(from var(--color-error) l c h / 0.35);
  color: var(--color-error);
}
.app-dialog-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

.tab-lock-overlay {
  position: fixed;
  inset: 0;
  z-index: 1200;
  display: grid;
  place-items: center;
  padding: var(--space-6);
  background:
    radial-gradient(circle at top, oklch(from var(--color-primary) l c h / 0.16), transparent 38%),
    oklch(from var(--color-bg) l c h / 0.82);
  backdrop-filter: blur(10px);
}

.tab-lock-card {
  width: min(520px, 100%);
  display: grid;
  gap: var(--space-4);
  padding: var(--space-6);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.25);
  border-radius: var(--radius-xl);
  background: linear-gradient(180deg, var(--color-surface), var(--color-surface-2));
  box-shadow: var(--shadow-lg);
}

.tab-lock-kicker {
  font-size: var(--text-xs);
  font-weight: 700;
  letter-spacing: 0.08em;
  text-transform: uppercase;
  color: var(--color-primary);
}

.tab-lock-title {
  font-size: var(--text-lg);
  line-height: 1.2;
}

.tab-lock-copy {
  color: var(--color-text-muted);
  font-size: var(--text-sm);
  line-height: 1.6;
}

.tab-lock-actions {
  display: flex;
  justify-content: flex-start;
}


/* ===== EDITOR LAYOUT ===== */

.editor-layout {
  display: flex;
  flex: 1;
  overflow: hidden;
  position: relative;
}

.editor-pane,
.preview-pane {
  display: flex;
  flex-direction: column;
  overflow: hidden;
}
.editor-pane {
  flex: 1;
  min-width: 200px;
}
.preview-pane {
  flex: 1;
  min-width: 200px;
}

.pane-header {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: var(--space-1) var(--space-3);
  background: var(--color-surface-offset);
  border-bottom: 1px solid var(--color-divider);
  flex-shrink: 0;
  height: 28px;
}
.pane-header-actions {
  display: flex;
  align-items: center;
  gap: var(--space-1);
}
.pane-header-meta {
  display: flex;
  align-items: baseline;
  gap: var(--space-3);
  min-width: 0;
}
.pane-label {
  font-size: 11px;
  font-weight: 500;
  color: var(--color-text-faint);
  text-transform: uppercase;
  letter-spacing: 0.06em;
}
.pane-label-meta {
  font-size: 11px;
  font-family: var(--font-mono);
  color: var(--color-text-faint);
}

/* Resizer */
.resizer {
  width: 4px;
  cursor: col-resize;
  background: var(--color-divider);
  flex-shrink: 0;
  position: relative;
  transition: background var(--transition-interactive);
  z-index: 5;
}
.resizer:hover,
.resizer.dragging {
  background: var(--color-primary);
}
.resizer::after {
  content: '';
  position: absolute;
  top: 0;
  left: -6px;
  right: -6px;
  bottom: 0;
}

/* Editor container (CodeMirror) */
.editor-container {
  flex: 1;
  overflow: hidden;
  background: var(--color-bg);
  position: relative;
}
.editor-container .cm-editor {
  height: 100%;
  font-family: var(--font-mono);
  font-size: 14px;
}
.editor-container .cm-editor .cm-scroller {
  overflow: auto;
  font-family: var(--font-mono);
}
.editor-container .cm-editor.cm-focused {
  outline: none;
}

/* y-webrtc cursor styles */
.cm-editor .cm-ySelectionInfo {
  font-family: var(--font-body);
  font-size: 11px;
  font-weight: 600;
  padding: 1px 4px;
  border-radius: 3px 3px 3px 0;
  opacity: 1;
  transition: opacity 0.3s;
  position: absolute;
  top: -1.2em;
  left: -1px;
  white-space: nowrap;
  z-index: 10;
}

/* Preview body (contains preview + outline side by side) */
.preview-body {
  display: flex;
  flex: 1;
  overflow: hidden;
  min-height: 0;
  position: relative;
}

/* Preview container */
.preview-container {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  background: var(--color-bg);
  overscroll-behavior: contain;
  min-width: 0;
}

.preview-content {
  padding: var(--space-6) var(--space-6) var(--space-12);
  max-width: 720px;
  margin: 0 auto;
  min-width: 0;
  overflow: hidden;
  position: relative;
  font-family: var(--font-body);
  font-size: var(--text-sm);
  line-height: 1.7;
  color: var(--color-text);
}
.preview-content[data-render-phase="shell"] {
  color: var(--color-text-muted);
}

.preview-content.is-excalidraw-file-preview {
  display: flex;
  width: 100%;
  min-height: 100%;
  height: 100%;
  margin: 0;
  padding: var(--space-3);
  position: relative;
  box-sizing: border-box;
  max-width: none;
}

.preview-content.is-plantuml-file-preview {
  width: 100%;
  min-height: 100%;
  max-width: none;
}

.preview-content.is-plantuml-file-preview [data-preview-render-host="true"] {
  min-height: 100%;
}

.preview-content.is-plantuml-file-preview .plantuml-shell {
  margin: 0;
  min-height: 100%;
}

.preview-content.is-excalidraw-file-preview .excalidraw-embed,
.preview-content.is-excalidraw-file-preview .excalidraw-embed-placeholder {
  margin: 0;
  width: 100%;
  min-height: 100%;
}

.preview-content.is-excalidraw-file-preview .excalidraw-embed {
  display: flex;
  flex-direction: column;
  height: 100%;
}

.preview-content.is-excalidraw-file-preview .excalidraw-embed-placeholder {
  display: flex;
  align-items: stretch;
}

.preview-content.is-excalidraw-file-preview .preview-shell {
  width: 100%;
  min-height: 100%;
}

.preview-content.is-excalidraw-file-preview .excalidraw-embed-iframe {
  flex: 1;
  min-height: 0;
  height: 100% !important;
}

.preview-content.is-excalidraw-file-preview .excalidraw-embed-resizer {
  display: none;
}

.preview-content.is-excalidraw-file-preview .excalidraw-embed.is-maximized {
  position: absolute;
  inset: var(--space-3);
  margin: 0;
  z-index: 2;
  max-width: calc(100% - (var(--space-3) * 2));
  box-sizing: border-box;
}

.preview-content.is-excalidraw-file-preview .excalidraw-embed.is-maximized .excalidraw-embed-iframe {
  height: 100% !important;
}

.preview-shell {
  min-height: 60vh;
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: var(--text-sm);
  color: var(--color-text-muted);
}

/* ===== MARKDOWN PREVIEW STYLES ===== */

.preview-content h1 {
  font-size: var(--text-xl);
  font-weight: 700;
  margin: var(--space-8) 0 var(--space-4);
  padding-bottom: var(--space-2);
  border-bottom: 1px solid var(--color-divider);
  letter-spacing: -0.02em;
}
.preview-content h1:first-child {
  margin-top: 0;
}
.preview-content h2 {
  font-size: var(--text-lg);
  font-weight: 600;
  margin: var(--space-6) 0 var(--space-3);
  letter-spacing: -0.01em;
}
.preview-content h3 {
  font-size: var(--text-base);
  font-weight: 600;
  margin: var(--space-5) 0 var(--space-2);
}
.preview-content h4, .preview-content h5, .preview-content h6 {
  font-size: var(--text-sm);
  font-weight: 600;
  margin: var(--space-4) 0 var(--space-2);
  color: var(--color-text-muted);
}

.preview-content p {
  margin-bottom: var(--space-4);
  max-width: 72ch;
}

.preview-content p:has(> .excalidraw-embed-placeholder:only-child) {
  max-width: none;
  margin-bottom: 0;
}

.preview-content p:has(> .plantuml-shell:only-child) {
  max-width: none;
  margin-bottom: 0;
}

.preview-content a {
  color: var(--color-primary);
  text-decoration: none;
  border-bottom: 1px solid oklch(from var(--color-primary) l c h / 0.3);
  transition: border-color var(--transition-interactive);
}
.preview-content a:hover {
  border-bottom-color: var(--color-primary);
}

.preview-content strong { font-weight: 600; }
.preview-content em { font-style: italic; }
.preview-content del { text-decoration: line-through; color: var(--color-text-muted); }

.preview-content ul,
.preview-content ol {
  margin-bottom: var(--space-4);
  padding-left: var(--space-6);
}
.preview-content li {
  margin-bottom: var(--space-1);
}
.preview-content li > ul,
.preview-content li > ol {
  margin-top: var(--space-1);
  margin-bottom: 0;
}

/* Task list checkboxes */
.preview-content .task-list-item {
  list-style: none;
  margin-left: calc(var(--space-6) * -1);
  padding-left: var(--space-1);
}
.preview-content .task-list-item input[type="checkbox"] {
  margin-right: var(--space-2);
  accent-color: var(--color-primary);
  vertical-align: middle;
}

/* Blockquote */
.preview-content blockquote {
  margin: var(--space-4) 0;
  padding: var(--space-3) var(--space-5);
  border-left: 3px solid var(--color-primary);
  background: var(--color-surface);
  border-radius: 0 var(--radius-md) var(--radius-md) 0;
  color: var(--color-text-muted);
}
.preview-content blockquote p:last-child {
  margin-bottom: 0;
}

/* Inline code */
.preview-content code {
  font-family: var(--font-mono);
  font-size: 0.875em;
  background: var(--color-surface-offset);
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  color: var(--color-primary);
}

/* Code blocks */
.preview-content pre {
  margin: var(--space-4) 0;
  border-radius: var(--radius-lg);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
  border: 1px solid var(--color-border);
  max-width: 100%;
  background: var(--color-surface);
}
.preview-content pre code {
  display: block;
  padding: var(--space-4);
  background: none;
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.6;
  white-space: pre;
  word-wrap: normal;
  overflow-wrap: normal;
  width: fit-content;
  min-width: 100%;
}

/* Tables */
.preview-content .table-wrapper {
  margin: var(--space-4) 0;
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  overflow-x: auto;
  -webkit-overflow-scrolling: touch;
}
.preview-content table {
  width: 100%;
  min-width: 100%;
  border-collapse: collapse;
  white-space: nowrap;
}
.preview-content th,
.preview-content td {
  padding: var(--space-2) var(--space-3);
  text-align: left;
  border-bottom: 1px solid var(--color-divider);
  font-size: var(--text-sm);
}
.preview-content th {
  background: var(--color-surface-offset);
  font-weight: 600;
  font-size: var(--text-xs);
  text-transform: uppercase;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
}
.preview-content tr:last-child td {
  border-bottom: none;
}
.preview-content tr:hover td {
  background: var(--color-surface-offset);
}

/* Horizontal rule */
.preview-content hr {
  border: none;
  height: 1px;
  background: var(--color-divider);
  margin: var(--space-8) 0;
}

/* Images */
.preview-content img {
  max-width: 100%;
  height: auto;
  border-radius: var(--radius-md);
  margin: var(--space-4) 0;
}

/* Mermaid diagrams */
.preview-content .mermaid-shell {
  margin: var(--space-4) 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  display: grid;
  gap: var(--space-3);
}
.preview-content .mermaid-placeholder-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
}
.preview-content .mermaid-placeholder-copy {
  display: grid;
  gap: 2px;
}
.preview-content .mermaid-placeholder-copy strong {
  font-size: var(--text-sm);
}
.preview-content .mermaid-placeholder-copy span {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}
.preview-content .mermaid-placeholder-btn {
  min-width: 64px;
  height: 30px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-xs);
  font-weight: 600;
}
.preview-content .mermaid-placeholder-btn:hover {
  background: var(--color-surface-2);
}
.preview-content .mermaid-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
}
.preview-content .mermaid-zoom-btn {
  min-width: 32px;
  height: 28px;
  padding: 0 var(--space-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-xs);
  font-weight: 600;
  transition: background var(--transition-interactive), color var(--transition-interactive), border-color var(--transition-interactive);
}
.preview-content .mermaid-zoom-btn:hover:not(:disabled) {
  background: var(--color-surface-offset);
}
.preview-content .mermaid-zoom-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.preview-content .mermaid-zoom-label {
  min-width: 52px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
}
.preview-content .mermaid-frame {
  overflow: auto;
  padding: 0;
  background: transparent;
  overscroll-behavior: contain;
  max-height: min(70vh, 720px);
}
.preview-content .mermaid-frame.is-pannable {
  cursor: grab;
}
.preview-content .mermaid-frame.is-dragging {
  cursor: grabbing;
  user-select: none;
}
.preview-content .mermaid-frame svg {
  display: block;
}
body.mermaid-maximized-open {
  overflow: hidden;
}
body.mermaid-maximized-open::before {
  content: '';
  position: fixed;
  inset: 0;
  background: oklch(0.1 0 0 / 0.42);
  backdrop-filter: blur(2px);
  z-index: 170;
}
.preview-content .mermaid-shell.is-maximized {
  position: fixed;
  inset: var(--space-4);
  z-index: 171;
  margin: 0;
  max-width: none;
  padding: var(--space-4);
  box-sizing: border-box;
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  grid-template-rows: auto minmax(0, 1fr);
}
.preview-content .mermaid-shell.is-maximized .mermaid-frame {
  max-height: none;
  height: 100%;
}

/* PlantUML diagrams */
.preview-content .plantuml-shell {
  margin: var(--space-4) 0;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-3);
  display: grid;
  gap: var(--space-3);
}
.preview-content .plantuml-placeholder-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-3);
  border-radius: var(--radius-md);
  background: var(--color-surface-offset);
}
.preview-content .plantuml-placeholder-copy {
  display: grid;
  gap: 2px;
}
.preview-content .plantuml-placeholder-copy strong {
  font-size: var(--text-sm);
}
.preview-content .plantuml-placeholder-copy span {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}
.preview-content .plantuml-placeholder-btn,
.preview-content .plantuml-tool-btn {
  min-width: 64px;
  height: 30px;
  padding: 0 var(--space-3);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-sm);
  background: var(--color-surface);
  color: var(--color-text);
  font-size: var(--text-xs);
  font-weight: 600;
}
.preview-content .plantuml-placeholder-btn:hover,
.preview-content .plantuml-tool-btn:hover:not(:disabled) {
  background: var(--color-surface-2);
}
.preview-content .plantuml-tool-btn:disabled {
  opacity: 0.5;
  cursor: not-allowed;
}
.preview-content .plantuml-toolbar {
  display: flex;
  align-items: center;
  justify-content: flex-end;
  gap: var(--space-2);
}
.preview-content .plantuml-zoom-label {
  min-width: 52px;
  text-align: center;
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  font-variant-numeric: tabular-nums;
}
.preview-content .plantuml-frame {
  overflow: auto;
  padding: var(--space-2);
  border-radius: var(--radius-md);
  background: linear-gradient(180deg, var(--color-surface-offset), var(--color-surface));
  border: 1px solid var(--color-border);
  max-height: min(70vh, 720px);
  overscroll-behavior: contain;
}
.preview-content .plantuml-frame.is-pannable {
  cursor: grab;
}
.preview-content .plantuml-frame.is-dragging {
  cursor: grabbing;
  user-select: none;
}
.preview-content .plantuml-frame svg {
  display: block;
}
body.plantuml-maximized-open {
  overflow: hidden;
}
body.plantuml-maximized-open::before {
  content: '';
  position: fixed;
  inset: 0;
  background: oklch(0.1 0 0 / 0.42);
  backdrop-filter: blur(2px);
  z-index: 170;
}
.preview-content .plantuml-shell.is-maximized {
  position: fixed;
  inset: var(--space-4);
  z-index: 171;
  margin: 0;
  max-width: none;
  padding: var(--space-4);
  box-sizing: border-box;
  background: var(--color-surface);
  box-shadow: var(--shadow-lg);
  grid-template-rows: auto minmax(0, 1fr);
}
.preview-content .plantuml-shell.is-maximized .plantuml-frame {
  max-height: none;
  height: 100%;
}

/* ===== OUTLINE PANEL ===== */

.pane-header-btn {
  padding: 2px 6px;
  border-radius: var(--radius-sm);
  display: flex;
  align-items: center;
  gap: var(--space-1);
  font-size: 11px;
  color: var(--color-text-muted);
  white-space: nowrap;
  transition: color var(--transition-interactive), background var(--transition-interactive);
}
.pane-header-btn:hover {
  color: var(--color-text);
  background: var(--color-surface-dynamic);
}
.pane-header-btn.active {
  color: var(--color-primary);
  background: oklch(from var(--color-primary) l c h / 0.1);
}

/* ===== BACKLINKS PANEL ===== */

.backlinks-panel {
  border-top: 1px solid var(--color-divider);
  margin-top: var(--space-6);
  padding: 0 var(--space-4);
}
.backlinks-panel.hidden {
  display: none;
}
.backlinks-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  cursor: pointer;
  user-select: none;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  transition: color var(--transition-interactive);
}
.backlinks-header:hover {
  color: var(--color-text);
}
.backlinks-header-empty {
  cursor: default;
  opacity: 0.5;
}
.backlinks-header-empty:hover {
  color: var(--color-text-muted);
}
.backlinks-chevron {
  flex-shrink: 0;
  transition: transform var(--transition-interactive);
}
.backlinks-panel.expanded .backlinks-chevron {
  transform: rotate(90deg);
}
.backlinks-toggle {
  flex: 1;
}
.backlinks-count {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: oklch(from var(--color-primary) l c h / 0.12);
  border-radius: var(--radius-full);
  padding: 1px 8px;
  min-width: 0;
}
.backlinks-count:empty {
  display: none;
}
.backlinks-body {
  overflow: hidden;
  max-height: 0;
  transition: max-height 200ms ease;
}
.backlinks-panel.expanded .backlinks-body {
  max-height: 600px;
  overflow-y: auto;
}
.backlinks-list {
  padding-bottom: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
}
.backlink-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: var(--space-3);
  border-radius: var(--radius-md);
  border: 1px solid var(--color-divider);
  background: var(--color-surface);
  cursor: pointer;
  transition: border-color var(--transition-interactive), background var(--transition-interactive);
}
.backlink-item:hover {
  border-color: var(--color-primary);
  background: oklch(from var(--color-primary) l c h / 0.04);
}
.backlink-item:focus-visible {
  outline: none;
  box-shadow: 0 0 0 2px oklch(from var(--color-primary) l c h / 0.45);
}
.backlink-file-name {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text);
  margin-bottom: var(--space-1);
}
.backlink-icon {
  flex-shrink: 0;
  color: var(--color-text-muted);
}
.backlink-dir {
  font-size: var(--text-xs);
  font-weight: 400;
  color: var(--color-text-faint);
  margin-left: auto;
}
.backlink-context {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  line-height: 1.6;
  padding-left: 22px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}
.backlink-more {
  font-style: italic;
  color: var(--color-text-faint);
}

.comments-panel {
  border-top: 1px solid var(--color-divider);
  padding: 0 var(--space-4) var(--space-6);
}
.comments-panel.hidden {
  display: none;
}
.comments-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) 0;
  cursor: pointer;
  user-select: none;
  font-size: var(--text-sm);
  font-weight: 600;
  color: var(--color-text-muted);
  transition: color var(--transition-interactive);
}
.comments-header:hover {
  color: var(--color-text);
}
.comments-chevron {
  flex-shrink: 0;
  transition: transform var(--transition-interactive);
}
.comments-panel.expanded .comments-chevron {
  transform: rotate(90deg);
}
.comments-toggle {
  flex: 1;
}
.comments-count {
  font-size: var(--text-xs);
  font-weight: 600;
  color: var(--color-primary);
  background: oklch(from var(--color-primary) l c h / 0.12);
  border-radius: var(--radius-full);
  padding: 1px 8px;
}
.comments-count:empty {
  display: none;
}
.comments-body {
  overflow: hidden;
  max-height: 0;
  transition: max-height 220ms ease;
}
.comments-panel.expanded .comments-body {
  max-height: 2400px;
}
.comments-empty-state {
  padding: var(--space-4);
  border: 1px dashed var(--color-border);
  border-radius: var(--radius-md);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: 12px;
}
.comment-composer {
  display: grid;
  gap: var(--space-3);
  margin-bottom: var(--space-4);
  padding: var(--space-4);
  border: 1px solid oklch(from var(--color-primary) l c h / 0.22);
  border-radius: var(--radius-lg);
  background: oklch(from var(--color-primary) l c h / 0.06);
}
.comment-composer-label {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text);
}
.comment-composer-form {
  display: grid;
  gap: var(--space-3);
}
.comment-composer-input {
  min-height: 88px;
  resize: vertical;
}
.comment-composer-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}
.comments-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-3);
}
.comment-thread {
  display: grid;
  gap: var(--space-3);
  padding: var(--space-4);
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-lg);
  background: var(--color-surface);
}
.comment-thread-header {
  display: flex;
  align-items: flex-start;
  justify-content: space-between;
  gap: var(--space-3);
}
.comment-thread-meta {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: var(--space-2);
}
.comment-thread-anchor {
  border: none;
  background: none;
  padding: 0;
  color: var(--color-primary);
  font-size: 12px;
  font-weight: 700;
  cursor: pointer;
}
.comment-thread-status {
  padding: 2px 8px;
  border-radius: var(--radius-full);
  background: var(--color-surface-offset);
  color: var(--color-text-muted);
  font-size: 10px;
  font-weight: 700;
  letter-spacing: 0.04em;
  text-transform: uppercase;
}
.comment-thread-actions {
  display: flex;
  align-items: center;
  gap: var(--space-2);
}
.comment-thread-action {
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-full);
  background: var(--color-surface-2);
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 600;
  padding: 4px 10px;
  cursor: pointer;
  transition: border-color var(--transition-interactive), color var(--transition-interactive), background var(--transition-interactive);
}
.comment-thread-action:hover {
  border-color: var(--color-primary);
  color: var(--color-text);
  background: oklch(from var(--color-primary) l c h / 0.08);
}
.comment-thread-excerpt {
  margin: 0;
  padding-left: var(--space-3);
  border-left: 3px solid oklch(from var(--color-primary) l c h / 0.25);
  color: var(--color-text-muted);
  font-size: 12px;
  line-height: 1.6;
}
.comment-thread-messages {
  display: grid;
  gap: var(--space-3);
}
.comment-message {
  display: grid;
  gap: var(--space-1);
}
.comment-message-meta {
  display: flex;
  flex-wrap: wrap;
  gap: var(--space-2);
  align-items: center;
}
.comment-message-author {
  font-size: 12px;
  font-weight: 700;
  color: var(--color-text);
}
.comment-message-time {
  font-size: 11px;
  color: var(--color-text-muted);
}
.comment-message-body {
  margin: 0;
  color: var(--color-text);
  font-size: 13px;
  line-height: 1.65;
  white-space: pre-wrap;
  word-break: break-word;
}
.comment-reply-form {
  display: grid;
  gap: var(--space-3);
  padding-top: var(--space-2);
  border-top: 1px solid var(--color-divider);
}
.comment-reply-input {
  min-height: 78px;
  resize: vertical;
}
.comment-reply-actions {
  display: flex;
  justify-content: flex-end;
  gap: var(--space-2);
}

.outline-panel {
  width: 220px;
  flex-shrink: 0;
  border-left: 1px solid var(--color-divider);
  background: var(--color-surface-offset);
  display: flex;
  flex-direction: column;
  overflow: hidden;
  transition: width 0.2s cubic-bezier(0.16, 1, 0.3, 1), opacity 0.15s ease;
}
.outline-panel.hidden {
  width: 0;
  border-left: none;
  opacity: 0;
  pointer-events: none;
}

.outline-header {
  padding: var(--space-2) var(--space-3);
  border-bottom: 1px solid var(--color-divider);
  flex-shrink: 0;
}
.outline-title {
  font-size: 11px;
  font-weight: 600;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--color-text-muted);
}

.outline-nav {
  flex: 1;
  overflow-y: auto;
  overflow-x: hidden;
  padding: var(--space-2) 0;
}
.outline-nav::-webkit-scrollbar {
  width: 4px;
}
.outline-nav::-webkit-scrollbar-thumb {
  background: var(--color-surface-dynamic);
  border-radius: var(--radius-full);
}

.outline-item {
  display: block;
  width: 100%;
  text-align: left;
  padding: 3px var(--space-3);
  font-size: 12px;
  line-height: 1.5;
  color: var(--color-text-muted);
  background: none;
  border: none;
  border-left: 2px solid transparent;
  cursor: pointer;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: color var(--transition-interactive), border-color var(--transition-interactive), background var(--transition-interactive);
  font-family: var(--font-body);
}
.outline-item:hover {
  color: var(--color-text);
  background: var(--color-surface-dynamic);
}
.outline-item.active {
  color: var(--color-primary);
  border-left-color: var(--color-primary);
  background: oklch(from var(--color-primary) l c h / 0.06);
}

.outline-item[data-level="1"] { padding-left: var(--space-3); font-weight: 600; }
.outline-item[data-level="2"] { padding-left: calc(var(--space-3) + 12px); }
.outline-item[data-level="3"] { padding-left: calc(var(--space-3) + 24px); font-size: 11px; }
.outline-item[data-level="4"] { padding-left: calc(var(--space-3) + 36px); font-size: 11px; }
.outline-item[data-level="5"] { padding-left: calc(var(--space-3) + 48px); font-size: 11px; }
.outline-item[data-level="6"] { padding-left: calc(var(--space-3) + 60px); font-size: 11px; }

.outline-empty {
  padding: var(--space-4) var(--space-3);
  font-size: 12px;
  color: var(--color-text-faint);
  font-style: italic;
}


/* ===== VIEW MODES ===== */

.editor-layout[data-view="editor"] .preview-pane,
.editor-layout[data-view="editor"] .resizer {
  display: none;
}
.editor-layout[data-view="preview"] .editor-pane,
.editor-layout[data-view="preview"] .resizer {
  display: none;
}
.editor-layout[data-view="preview"] .preview-pane {
  flex: 1;
}
.editor-layout[data-view="preview"] .preview-content {
  max-width: 1080px;
}
.editor-layout[data-view="preview"] .preview-content.is-excalidraw-file-preview {
  max-width: none;
}
.editor-layout[data-view="preview"] .preview-content.is-plantuml-file-preview {
  max-width: none;
}
.editor-layout[data-view="preview"] .preview-content p {
  max-width: 84ch;
}

.editor-layout[data-view="preview"] .preview-content p:has(> .excalidraw-embed-placeholder:only-child) {
  max-width: none;
}

.editor-layout[data-view="preview"] .preview-content p:has(> .plantuml-shell:only-child) {
  max-width: none;
}
.editor-layout[data-view="editor"] .editor-pane {
  flex: 1;
}

.comment-anchor-target {
  position: relative;
}
.comment-anchor-target.is-comment-target {
  box-shadow: inset 3px 0 0 oklch(from var(--color-primary) l c h / 0.35);
  border-radius: var(--radius-sm);
}
.comment-anchor-btn {
  position: absolute;
  top: 6px;
  right: 0;
  min-width: 28px;
  height: 24px;
  padding: 0 8px;
  border: 1px solid var(--color-divider);
  border-radius: var(--radius-full);
  background: oklch(from var(--color-surface) l c h / 0.92);
  color: var(--color-text-muted);
  font-size: 11px;
  font-weight: 700;
  line-height: 22px;
  text-align: center;
  box-shadow: var(--shadow-sm);
  opacity: 0.18;
  transition: opacity var(--transition-interactive), border-color var(--transition-interactive), color var(--transition-interactive), background var(--transition-interactive);
  z-index: 2;
}
.comment-anchor-btn::after {
  content: attr(data-count);
  display: block;
}
.comment-anchor-btn.has-comments {
  opacity: 0.96;
  color: var(--color-primary);
  border-color: oklch(from var(--color-primary) l c h / 0.28);
  background: oklch(from var(--color-primary) l c h / 0.1);
}
.comment-anchor-btn.has-open-comments {
  border-color: oklch(from var(--color-warning) l c h / 0.32);
  color: var(--color-warning);
}
.comment-anchor-target:hover > .comment-anchor-btn,
.comment-anchor-target:focus-within > .comment-anchor-btn {
  opacity: 1;
}
.comment-anchor-btn:hover {
  color: var(--color-text);
  border-color: var(--color-primary);
  opacity: 1;
}


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

.toast-container {
  position: fixed;
  bottom: var(--space-4);
  right: var(--space-4);
  display: flex;
  flex-direction: column;
  gap: var(--space-2);
  z-index: 100;
  pointer-events: none;
}
.toast {
  pointer-events: auto;
  padding: var(--space-2) var(--space-4);
  background: var(--color-surface-2);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-md);
  font-size: var(--text-xs);
  color: var(--color-text);
  box-shadow: var(--shadow-md);
  animation: toast-in 300ms cubic-bezier(0.16, 1, 0.3, 1);
  max-width: 320px;
}
.toast.leaving {
  animation: toast-out 200ms cubic-bezier(0.16, 1, 0.3, 1) forwards;
}
@keyframes toast-in {
  from { opacity: 0; transform: translateX(8px) scale(0.96); }
  to { opacity: 1; transform: translateX(0) scale(1); }
}
@keyframes toast-out {
  from { opacity: 1; transform: translateX(0) scale(1); }
  to { opacity: 0; transform: translateX(8px) scale(0.96); }
}


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

@media (max-width: 768px) {
  .sidebar {
    position: fixed;
    top: 0;
    left: 0;
    bottom: 0;
    z-index: 100;
    box-shadow: var(--shadow-lg);
  }

  .sidebar.collapsed {
    display: none;
  }

  .toolbar-btn-label { display: none; }
  .toolbar-center { display: none; }
  .mobile-view-toggle { display: flex !important; }
  .toolbar-name-btn { max-width: none; }
  .sidebar-close-btn { display: inline-flex; }

  .editor-layout {
    flex-direction: column;
  }
  .resizer {
    display: none !important;
  }

  /* On mobile, hide the non-active pane */
  .editor-layout[data-view="split"] .preview-pane {
    display: none;
  }
  .editor-layout[data-view="split"] .editor-pane {
    flex: 1;
  }

  .preview-content {
    padding: var(--space-4);
  }

  .comment-anchor-btn {
    opacity: 0.92;
  }

  .outline-panel {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    width: auto;
    border-left: none;
    border-top: 1px solid var(--color-divider);
    background: oklch(from var(--color-surface) l c h / 0.98);
    backdrop-filter: blur(10px);
    box-shadow: var(--shadow-lg);
    z-index: 6;
  }
  .outline-panel.hidden {
    display: none !important;
  }
  #outlineToggle {
    display: inline-flex !important;
  }
  
  .toolbar {
    padding: 0 var(--space-2);
  }
  .toolbar-room-name {
    font-size: var(--text-xs);
    max-width: 120px;
  }

  .chat-panel {
    position: fixed;
    top: calc(var(--toolbar-h) + var(--space-2));
    right: var(--space-2);
    left: var(--space-2);
    width: auto;
    max-height: calc(100vh - var(--toolbar-h) - var(--space-6));
  }

  .chat-form {
    align-items: stretch;
  }

  .chat-send-btn {
    padding-inline: var(--space-3);
  }
}

@media (min-width: 769px) {
  .mobile-view-toggle { display: none !important; }
}


/* ===== LIGHT MODE OVERRIDES ===== */

[data-theme="light"] .preview-content pre,
[data-theme="light"] .preview-content pre code,
[data-theme="light"] .hljs {
  background: var(--color-surface) !important;
}


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

.preview-container::-webkit-scrollbar,
.cm-scroller::-webkit-scrollbar {
  width: 8px;
}
.preview-container::-webkit-scrollbar-track,
.cm-scroller::-webkit-scrollbar-track {
  background: transparent;
}
.preview-container::-webkit-scrollbar-thumb,
.cm-scroller::-webkit-scrollbar-thumb {
  background: var(--color-surface-dynamic);
  border-radius: var(--radius-full);
}
.preview-container::-webkit-scrollbar-thumb:hover,
.cm-scroller::-webkit-scrollbar-thumb:hover {
  background: var(--color-text-faint);
}

/* ===== WIKI-LINK AUTOCOMPLETE ===== */

.cm-tooltip-autocomplete {
  background: var(--color-surface) !important;
  border: 1px solid var(--color-divider) !important;
  border-radius: var(--radius-md) !important;
  box-shadow: var(--shadow-md) !important;
  overflow: hidden;
  font-family: var(--font-body);
  font-size: var(--text-sm);
}

.cm-tooltip-autocomplete > ul {
  max-height: 240px !important;
  padding: var(--space-1) 0;
}

.cm-tooltip-autocomplete > ul > li {
  padding: var(--space-2) var(--space-3) !important;
  line-height: 1.4;
  display: flex;
  align-items: center;
  gap: var(--space-2);
}

.cm-tooltip-autocomplete > ul > li[aria-selected] {
  background: var(--color-primary) !important;
  color: var(--color-text-inverse) !important;
}

.cm-tooltip-autocomplete .cm-completionLabel {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.cm-tooltip-autocomplete .cm-completionDetail {
  font-size: var(--text-xs);
  opacity: 0.6;
  margin-left: auto;
  white-space: nowrap;
}

.cm-tooltip-autocomplete > ul > li[aria-selected] .cm-completionDetail {
  opacity: 0.85;
}

.cm-completionIcon-text::after {
  content: '📄';
  font-size: 13px;
}

/* ===== QUICK SWITCHER (Cmd+K) ===== */

.qs-overlay {
  position: fixed;
  inset: 0;
  z-index: 9999;
  display: flex;
  justify-content: center;
  padding-top: min(20vh, 160px);
  background: oklch(0.1 0 0 / 0.5);
  backdrop-filter: blur(4px);
  opacity: 0;
  visibility: hidden;
  transition: opacity 120ms ease, visibility 120ms ease;
}

.qs-overlay.visible {
  opacity: 1;
  visibility: visible;
}

.qs-modal {
  width: min(560px, calc(100vw - 32px));
  max-height: min(440px, 60vh);
  display: flex;
  flex-direction: column;
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  box-shadow: var(--shadow-lg);
  overflow: hidden;
  transform: translateY(-8px) scale(0.98);
  transition: transform 120ms cubic-bezier(0.16, 1, 0.3, 1);
}

.qs-overlay.visible .qs-modal {
  transform: translateY(0) scale(1);
}

.qs-input-wrap {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-3) var(--space-4);
  border-bottom: 1px solid var(--color-divider);
}

.qs-search-icon {
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.qs-input {
  flex: 1;
  border: none;
  outline: none;
  background: transparent;
  font-size: var(--text-sm);
  font-family: var(--font-body);
  color: var(--color-text);
  line-height: 1.5;
}

.qs-input::placeholder {
  color: var(--color-text-faint);
}

.qs-kbd {
  flex-shrink: 0;
  font-family: var(--font-body);
  font-size: 11px;
  line-height: 1;
  padding: 3px 6px;
  border-radius: var(--radius-sm);
  background: var(--color-surface-offset);
  border: 1px solid var(--color-divider);
  color: var(--color-text-muted);
  text-transform: uppercase;
  letter-spacing: 0.03em;
}

.qs-results {
  overflow-y: auto;
  overscroll-behavior: contain;
  padding: var(--space-1) 0;
}

.qs-result-item {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  width: 100%;
  padding: var(--space-2) var(--space-4);
  border: none;
  background: transparent;
  color: var(--color-text);
  font-size: var(--text-sm);
  font-family: var(--font-body);
  text-align: left;
  cursor: pointer;
  transition: background 60ms ease;
}

.qs-result-item:hover,
.qs-result-item.selected {
  background: var(--color-surface-offset);
}

.qs-result-item.selected {
  background: var(--color-primary-highlight);
}

[data-theme="dark"] .qs-result-item.selected {
  background: oklch(from var(--color-primary) l c h / 0.18);
}

.qs-result-icon {
  flex-shrink: 0;
  color: var(--color-text-muted);
}

.qs-result-name {
  flex: 1;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.qs-result-name mark {
  background: oklch(from var(--color-primary) l c h / 0.2);
  color: var(--color-primary);
  border-radius: 2px;
  padding: 0 1px;
}

.qs-result-path {
  flex-shrink: 0;
  font-size: var(--text-xs);
  color: var(--color-text-faint);
  max-width: 200px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.qs-hint {
  padding: var(--space-4) var(--space-4);
  text-align: center;
  font-size: var(--text-xs);
  color: var(--color-text-muted);
}

.qs-hint.hidden {
  display: none;
}

/* ── Excalidraw Embeds ───────────────────────────────────────────── */

.excalidraw-embed,
.excalidraw-embed-placeholder {
  margin: var(--space-4) 0;
  border: 1px solid var(--color-border);
  border-radius: 8px;
  overflow: hidden;
  background: var(--color-surface);
  transition: box-shadow 0.18s ease;
  display: block;
  width: 100%;
  max-width: 100%;
  box-sizing: border-box;
}

.excalidraw-embed-overlay-root {
  position: absolute;
  inset: 0;
  pointer-events: none;
  z-index: 1;
}

body.excalidraw-maximized-open {
  overflow: hidden;
}

body.excalidraw-maximized-open .excalidraw-embed-overlay-root {
  z-index: 141;
}

body.excalidraw-maximized-open .resizer {
  opacity: 0;
  pointer-events: none;
}

.excalidraw-embed:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.08);
}

[data-theme="dark"] .excalidraw-embed:hover {
  box-shadow: 0 2px 12px rgba(0, 0, 0, 0.3);
}

.excalidraw-embed-placeholder-card {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: var(--space-3);
  padding: var(--space-4);
  background: var(--color-surface);
}

.excalidraw-embed-placeholder-copy {
  display: grid;
  gap: 2px;
}

.excalidraw-embed-placeholder-copy strong {
  font-size: var(--text-sm);
}

.excalidraw-embed-placeholder-copy span {
  color: var(--color-text-muted);
  font-size: var(--text-xs);
}

.excalidraw-embed-placeholder-btn {
  flex-shrink: 0;
  appearance: none;
  border: 1px solid var(--color-border);
  background: var(--color-surface-2);
  color: var(--color-text);
  font-size: var(--text-xs);
  padding: 4px 10px;
  border-radius: 4px;
  cursor: pointer;
}

.excalidraw-embed-placeholder-btn:hover {
  background: var(--color-surface-offset);
}

.excalidraw-embed-header {
  display: flex;
  align-items: center;
  gap: var(--space-2);
  padding: var(--space-2) var(--space-3);
  background: var(--color-surface-raised);
  border-bottom: 1px solid var(--color-border);
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  user-select: none;
}

.excalidraw-embed-icon {
  display: flex;
  align-items: center;
  color: var(--color-primary);
  flex-shrink: 0;
}

.excalidraw-embed-label {
  flex: 1;
  min-width: 0;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
  font-weight: 500;
}

.excalidraw-embed-btn {
  flex-shrink: 0;
  appearance: none;
  border: none;
  background: var(--color-surface);
  color: var(--color-text-muted);
  font-size: var(--text-xs);
  padding: 2px 8px;
  border-radius: 4px;
  cursor: pointer;
  transition: background 0.18s ease, color 0.18s ease;
}

.excalidraw-embed-btn:hover {
  background: var(--color-surface-hover);
  color: var(--color-text);
}

.excalidraw-embed-iframe {
  display: block;
  width: 100%;
  border: none;
  background: white;
  min-height: 200px;
}

[data-theme="dark"] .excalidraw-embed-iframe {
  background: #121212;
}

.excalidraw-embed.is-maximized {
  position: fixed;
  inset: 72px 20px 20px;
  margin: 0;
  z-index: 140;
  max-width: calc(100vw - 40px);
  box-sizing: border-box;
  border-radius: 10px;
  box-shadow: 0 10px 40px rgba(0, 0, 0, 0.35);
  display: flex;
  flex-direction: column;
}

.excalidraw-embed.is-maximized .excalidraw-embed-header {
  flex-shrink: 0;
}

.excalidraw-embed.is-maximized .excalidraw-embed-iframe {
  height: calc(100vh - 132px) !important;
  min-height: 0;
  flex: 1;
}

.excalidraw-embed.is-maximized .excalidraw-embed-resizer {
  display: none;
}

[data-theme="dark"] .excalidraw-embed.is-maximized {
  box-shadow: 0 16px 48px rgba(0, 0, 0, 0.6);
}

@media (max-width: 768px) {
  .excalidraw-embed.is-maximized {
    inset: 56px 10px 10px;
    max-width: calc(100vw - 20px);
  }

  .excalidraw-embed.is-maximized .excalidraw-embed-iframe {
    height: calc(100vh - 114px) !important;
  }
}

.excalidraw-embed-resizer {
  height: 6px;
  background: var(--color-border);
  cursor: ns-resize;
  transition: background 0.18s ease;
  position: relative;
}

.excalidraw-embed-resizer::after {
  content: '';
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  width: 32px;
  height: 3px;
  border-radius: 2px;
  background: var(--color-text-faint);
  opacity: 0;
  transition: opacity 0.18s ease;
}

.excalidraw-embed-resizer:hover {
  background: var(--color-primary);
}

.excalidraw-embed-resizer:hover::after {
  opacity: 1;
}

/* File tree — excalidraw file icon */

.file-tree-file.is-excalidraw .file-tree-icon {
  color: var(--color-primary);
}