/* App Layout */
.app-layout {
  display: flex;
  width: 100%;
  height: 100%;
}

.sidebar {
  width: var(--sidebar-width);
  background-color: var(--bg-sidebar);
  border-right: 1px solid var(--border-light);
  display: flex;
  flex-direction: column;
  flex-shrink: 0;
  height: 100%;
  transition: width 0.3s cubic-bezier(0.4, 0, 0.2, 1);
  overflow: hidden;
}

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

.sidebar-header {
  height: var(--header-height);
  display: flex;
  align-items: center;
  padding: 0 20px;
  font-weight: 600;
  color: var(--text-primary);
  border-bottom: 1px solid transparent; /* Align with main header if needed */
}

.sidebar-toggle-btn {
  width: 36px;
  height: 36px;
  border: none;
  background: transparent;
  color: var(--text-secondary);
  cursor: pointer;
  border-radius: 4px;
  font-size: 1.2rem;
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.15s;
  flex-shrink: 0;
}

.sidebar-toggle-btn:hover {
  background-color: rgba(0,0,0,0.05);
  color: var(--text-primary);
}

.app-logo {
  width: 32px;
  height: 32px;
  /* background: var(--text-primary); removed */
  display: flex;
  align-items: center;
  justify-content: center;
  /* box-shadow: var(--shadow-sm); removed */
}

.outline-nav {
  padding: 20px;
  overflow-y: auto;
  flex: 1;
}

.outline-nav h3 {
  font-size: 0.75rem;
  text-transform: uppercase;
  letter-spacing: 0.05em;
  color: var(--text-secondary);
  margin-bottom: 12px;
  font-weight: 600;
}

.outline-list {
  list-style: none;
  padding: 0;
  margin: 0;
}

.outline-list li {
  padding: 6px 10px;
  border-radius: 6px;
  color: var(--text-secondary);
  font-size: 0.9rem;
  cursor: pointer;
  margin-bottom: 2px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  transition: all 0.15s;
}

.outline-list li:hover {
  background-color: rgba(0,0,0,0.03);
  color: var(--text-primary);
}

.outline-list li.active {
  background-color: #ebeef4;
  color: var(--text-primary);
  font-weight: 500;
}

.outline-list li.level-1 { padding-left: 10px; font-weight: 600; }
.outline-list li.level-2 { padding-left: 24px; }
.outline-list li.level-3 { padding-left: 38px; }

.main-column {
  flex: 1;
  display: flex;
  flex-direction: column;
  min-width: 0;
  height: 100vh;
  overflow: hidden;
  background-color: var(--bg-app);
}

.app-header {
  height: var(--header-height);
  background-color: var(--bg-paper);
  border-bottom: 1px solid var(--border-light);
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 0 20px;
  flex-shrink: 0;
}

.file-info {
  display: flex;
  align-items: center;
  gap: 12px;
  flex: 1;
  min-width: 0;
}

.file-name {
  font-weight: 600;
  font-size: 1rem;
  color: var(--text-primary);
}

/* Editable document title */
#doc-title {
  cursor: text;
  padding: 2px 6px;
  border-radius: 4px;
  border: 1px solid transparent;
  transition: all 0.15s;
  max-width: 300px;
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

#doc-title:hover {
  background-color: rgba(0, 0, 0, 0.03);
  border-color: var(--border-light);
}

#doc-title:focus {
  outline: none;
  background-color: white;
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px var(--accent-bg);
}

.window-controls {
  display: flex;
  gap: 10px;
}

.btn-share {
  background-color: var(--accent-color);
  color: white;
  border: none;
  padding: 6px 16px;
  border-radius: 6px;
  font-size: 0.85rem;
  font-weight: 500;
  cursor: pointer;
}

.btn-share:hover {
  background-color: var(--accent-hover);
}

.ribbon-container {
  background-color: var(--bg-paper);
  border-bottom: 1px solid var(--border-light);
  flex-shrink: 0;
  display: flex;
  flex-direction: column;
}

/* Ribbon tabs removed */

.ribbon-toolbar {
  padding: 12px 24px;
  display: flex;
  align-items: center;
  gap: 16px;
  min-height: 60px;
  background: white;
}

.toolbar-group {
  display: flex;
  align-items: center;
  gap: 6px;
  padding-right: 16px;
  border-right: 1px solid var(--border-light);
}

.toolbar-group:last-child {
  border-right: none;
  padding-right: 0;
}

.separator-small {
    width: 1px;
    height: 18px;
    background-color: var(--border-light);
    margin: 0 6px;
}

.tool-btn {
  width: 34px;
  height: 34px;
  display: flex;
  align-items: center;
  justify-content: center;
  border: 1px solid transparent;
  background: transparent;
  border-radius: 6px;
  color: var(--text-secondary);
  cursor: pointer;
  transition: all 0.2s cubic-bezier(0.2, 0, 0, 1);
}

.tool-btn:hover {
  background-color: var(--bg-hover);
  color: var(--text-primary);
  transform: translateY(-1px);
}

.tool-btn:active {
  transform: translateY(1px);
}

.tool-btn svg {
    opacity: 0.8;
}

.tool-btn:hover svg {
    opacity: 1;
}

.tool-select {
  padding: 6px 10px;
  border: 1px solid transparent;
  border-radius: 6px;
  background: transparent;
  font-size: 0.9rem;
  color: var(--text-primary);
  cursor: pointer;
  height: 34px;
}

.tool-select:hover {
  background-color: var(--bg-hover);
}

.tool-select:focus {
    outline: none;
    background-color: var(--bg-paper);
    border-color: var(--border-light);
    box-shadow: var(--shadow-sm);
}

.tool-btn.text-btn {
  width: auto;
  padding: 0 10px;
  min-width: 48px;
}

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

.tool-btn.active {
  background-color: var(--accent-bg);
  color: var(--accent-color);
}

.tool-select {
  padding: 4px 8px;
  border: 1px solid transparent;
  border-radius: 4px;
  background: transparent;
  font-size: 0.9rem;
  color: var(--text-primary);
  cursor: pointer;
}

.tool-select:hover {
  background-color: var(--bg-hover);
}

.color-picker-wrapper {
  position: relative;
  width: 32px;
  height: 32px;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  border-radius: 4px;
}

.color-picker-wrapper:hover {
  background: var(--bg-hover);
}

.color-indicator {
  width: 16px;
  height: 16px;
  border-radius: 2px;
  border: 1px solid var(--border-light);
}