/* Base styles */
* {
  box-sizing: border-box;
  margin: 0;
  padding: 0;
}

html {
  font-size: 16px;
  height: 100%;
}

body {
  font-family: var(--font-family);
  font-size: var(--font-size-md);
  line-height: 1.5;
  color: var(--text-primary);
  background-color: var(--background-color);
  min-height: 100%;
  display: flex;
  flex-direction: column;
  overflow-x: hidden;
}

/* Typography */
h1, h2, h3, h4, h5, h6 {
  margin-bottom: var(--spacing-md);
  font-weight: 500;
  line-height: 1.2;
}

h1 {
  font-size: var(--font-size-xxxl);
}

h2 {
  font-size: var(--font-size-xxl);
}

h3 {
  font-size: var(--font-size-xl);
}

p {
  margin-bottom: var(--spacing-md);
}

a {
  color: var(--primary-color);
  text-decoration: none;
  transition: color var(--transition-fast);
}

a:hover, a:focus {
  color: var(--primary-dark);
  text-decoration: underline;
}

/* Layout */
.app-container {
  display: flex;
  height: calc(100vh - var(--header-height));
  position: relative;
}

/* Header */
.app-header {
  height: var(--header-height);
  background-color: var(--primary-color);
  color: var(--on-primary-color);
  position: sticky;
  top: 0;
  z-index: var(--z-index-header);
  box-shadow: var(--shadow-sm);
  display: flex;
  flex-direction: column;
}

.header-content {
  display: flex;
  align-items: center;
  padding: 0 var(--spacing-md);
  height: var(--header-height);
}

.app-title {
  flex: 1;
  margin: 0;
  font-size: var(--font-size-xl);
  font-weight: 500;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  padding: 0 var(--spacing-md);
}

.header-actions {
  display: flex;
  gap: var(--spacing-sm);
}

/* Search container */
.search-container {
  background-color: var(--primary-dark);
  padding: var(--spacing-sm) var(--spacing-md);
  transition: max-height var(--transition-medium), opacity var(--transition-medium);
  max-height: 60px;
  opacity: 1;
}

.search-container.hidden {
  max-height: 0;
  opacity: 0;
  overflow: hidden;
  padding-top: 0;
  padding-bottom: 0;
}

.search-input-wrapper {
  display: flex;
  align-items: center;
  background-color: rgba(255, 255, 255, 0.15);
  border-radius: var(--border-radius-md);
  padding: var(--spacing-xs) var(--spacing-sm);
}

.search-input-wrapper .material-icons {
  color: var(--on-primary-color);
  opacity: 0.8;
  margin-right: var(--spacing-sm);
}

#search-input {
  flex: 1;
  background: transparent;
  border: none;
  color: var(--on-primary-color);
  font-size: var(--font-size-md);
  padding: var(--spacing-xs) 0;
  outline: none;
}

#search-input::placeholder {
  color: var(--on-primary-color);
  opacity: 0.7;
}

/* Side navigation */
.side-nav {
  width: var(--nav-width);
  background-color: var(--surface-color);
  border-right: 1px solid var(--border-color);
  height: 100%;
  overflow-y: auto;
  display: flex;
  flex-direction: column;
  transition: transform var(--transition-medium);
  z-index: var(--z-index-nav);
}

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

.nav-header h2 {
  margin: 0;
  font-size: var(--font-size-lg);
}

.category-list {
  list-style: none;
  flex: 1;
  overflow-y: auto;
}

.category-item {
  display: flex;
  align-items: center;
  padding: var(--spacing-md);
  cursor: pointer;
  transition: background-color var(--transition-fast);
}

.category-item:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.category-item.active {
  background-color: rgba(66, 133, 244, 0.1);
  color: var(--primary-color);
}

.category-item .material-icons {
  margin-right: var(--spacing-md);
}

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

.bookmark-count {
  background-color: rgba(0, 0, 0, 0.1);
  border-radius: var(--border-radius-circle);
  padding: 2px 8px;
  font-size: var(--font-size-xs);
}

.nav-footer {
  border-top: 1px solid var(--divider-color);
  padding: var(--spacing-md);
  display: flex;
  flex-direction: column;
  gap: var(--spacing-sm);
}

.nav-button {
  display: flex;
  align-items: center;
  padding: var(--spacing-sm) var(--spacing-md);
  background: none;
  border: none;
  border-radius: var(--border-radius-md);
  cursor: pointer;
  color: var(--text-primary);
  transition: background-color var(--transition-fast);
}

.nav-button:hover {
  background-color: rgba(0, 0, 0, 0.05);
}

.nav-button .material-icons {
  margin-right: var(--spacing-md);
}

/* Main content */
.main-content {
  flex: 1;
  overflow-y: auto;
  background-color: var(--background-color);
  position: relative;
}

.view {
  padding: var(--spacing-md);
  max-width: var(--max-content-width);
  margin: 0 auto;
}

.view.hidden {
  display: none;
}

.view-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-bottom: var(--spacing-lg);
}

.view-header h2 {
  margin: 0;
}

.view-actions {
  display: flex;
  gap: var(--spacing-md);
  align-items: center;
}

.view-toggle {
  display: flex;
  border-radius: var(--border-radius-md);
  overflow: hidden;
  border: 1px solid var(--border-color);
}

.view-toggle .icon-button {
  border-radius: 0;
  border: none;
  background-color: var(--surface-color);
}

.view-toggle .icon-button.active {
  background-color: var(--primary-color);
  color: var(--on-primary-color);
}

/* Bookmarks container */
.bookmarks-container {
  display: grid;
  gap: var(--spacing-md);
}

.bookmarks-container.grid-view {
  grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
}

.bookmarks-container.list-view {
  grid-template-columns: 1fr;
}

/* Empty state */
.empty-state {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-xxl);
  text-align: center;
  color: var(--text-secondary);
}

.empty-state .material-icons {
  font-size: 64px;
  margin-bottom: var(--spacing-md);
  opacity: 0.5;
}

/* Buttons */
.button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-md);
  font-size: var(--font-size-md);
  font-weight: 500;
  cursor: pointer;
  transition: background-color var(--transition-fast), color var(--transition-fast);
  border: none;
  outline: none;
}

.button.primary {
  background-color: var(--primary-color);
  color: var(--on-primary-color);
}

.button.primary:hover, .button.primary:focus {
  background-color: var(--primary-dark);
}

.button.secondary {
  background-color: transparent;
  color: var(--primary-color);
  border: 1px solid var(--primary-color);
}

.button.secondary:hover, .button.secondary:focus {
  background-color: rgba(66, 133, 244, 0.1);
}

.icon-button {
  display: inline-flex;
  align-items: center;
  justify-content: center;
  width: 40px;
  height: 40px;
  border-radius: var(--border-radius-circle);
  background: none;
  border: none;
  cursor: pointer;
  color: inherit;
  transition: background-color var(--transition-fast);
}

.icon-button:hover, .icon-button:focus {
  background-color: rgba(0, 0, 0, 0.1);
}

.text-button {
  display: inline-flex;
  align-items: center;
  background: none;
  border: none;
  color: var(--primary-color);
  font-size: var(--font-size-md);
  padding: var(--spacing-sm);
  cursor: pointer;
  border-radius: var(--border-radius-md);
  transition: background-color var(--transition-fast);
}

.text-button:hover, .text-button:focus {
  background-color: rgba(66, 133, 244, 0.1);
}

.text-button .material-icons {
  font-size: 18px;
  margin-right: var(--spacing-xs);
}

/* Modal */
.modal-container {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-index-modal);
}

.modal-container.hidden {
  display: none;
}

.modal-backdrop {
  position: absolute;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.5);
  z-index: var(--z-index-modal-backdrop);
}

.modal {
  background-color: var(--surface-color);
  border-radius: var(--border-radius-lg);
  box-shadow: var(--shadow-lg);
  width: 90%;
  max-width: 500px;
  max-height: 90vh;
  overflow-y: auto;
  z-index: var(--z-index-modal);
  display: flex;
  flex-direction: column;
}

.modal.hidden {
  display: none;
}

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

.modal-header h3 {
  margin: 0;
}

.modal-content {
  padding: var(--spacing-md);
  flex: 1;
  overflow-y: auto;
}

.modal-footer {
  padding: var(--spacing-md);
  border-top: 1px solid var(--divider-color);
  display: flex;
  justify-content: flex-end;
  gap: var(--spacing-md);
}

/* Forms */
.form-group {
  margin-bottom: var(--spacing-lg);
}

label {
  display: block;
  margin-bottom: var(--spacing-xs);
  font-weight: 500;
  color: var(--text-secondary);
}

input[type="text"],
input[type="url"],
textarea {
  width: 100%;
  padding: var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background-color: var(--background-color);
  color: var(--text-primary);
  font-size: var(--font-size-md);
  transition: border-color var(--transition-fast);
}

input[type="text"]:focus,
input[type="url"]:focus,
textarea:focus {
  border-color: var(--primary-color);
  outline: none;
}

input[type="color"] {
  width: 40px;
  height: 40px;
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
  background-color: var(--background-color);
  cursor: pointer;
}

.categories-container {
  display: flex;
  flex-wrap: wrap;
  gap: var(--spacing-sm);
  margin-bottom: var(--spacing-sm);
  min-height: 40px;
  padding: var(--spacing-sm);
  border: 1px solid var(--border-color);
  border-radius: var(--border-radius-md);
}

/* Toast notification */
.toast {
  position: fixed;
  bottom: var(--spacing-lg);
  left: 50%;
  transform: translateX(-50%);
  background-color: var(--surface-color);
  color: var(--text-primary);
  padding: var(--spacing-sm) var(--spacing-lg);
  border-radius: var(--border-radius-md);
  box-shadow: var(--shadow-md);
  z-index: var(--z-index-toast);
  transition: opacity var(--transition-medium), transform var(--transition-medium);
}

.toast.hidden {
  opacity: 0;
  transform: translateX(-50%) translateY(20px);
  pointer-events: none;
}

/* Offline indicator */
.offline-indicator {
  position: fixed;
  top: var(--header-height);
  left: 0;
  right: 0;
  background-color: var(--error-color);
  color: white;
  padding: var(--spacing-sm);
  text-align: center;
  z-index: var(--z-index-offline);
  display: flex;
  align-items: center;
  justify-content: center;
  gap: var(--spacing-sm);
  transition: transform var(--transition-medium);
}

.offline-indicator.hidden {
  transform: translateY(-100%);
}

/* Loading indicator */
.loading-indicator {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
  background-color: rgba(0, 0, 0, 0.3);
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: var(--z-index-toast);
}

.loading-indicator.hidden {
  display: none;
}

.spinner {
  width: 40px;
  height: 40px;
  border: 4px solid rgba(255, 255, 255, 0.3);
  border-radius: 50%;
  border-top-color: var(--primary-color);
  animation: spin 1s linear infinite;
}

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

/* Utility classes */
.hidden {
  display: none !important;
}

/* Responsive styles */
@media (max-width: 768px) {
  .side-nav {
    position: fixed;
    top: var(--header-height);
    bottom: 0;
    left: 0;
    transform: translateX(-100%);
  }
  
  .side-nav.open {
    transform: translateX(0);
  }
  
  .bookmarks-container.grid-view {
    grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  }
}

@media (max-width: 480px) {
  .view {
    padding: var(--spacing-sm);
  }
  
  .bookmarks-container.grid-view {
    grid-template-columns: 1fr;
  }
  
  .modal {
    width: 95%;
  }
}