:root {
  --bg-primary: rgba(255, 255, 255, 0.95);
  --bg-secondary: rgba(255, 255, 255, 0.85);
  --bg-card: rgba(255, 255, 255, 0.9);
  --bg-overlay: rgba(0, 0, 0, 0.65);
  --text-primary: #1a1a1a;
  --text-secondary: #666;
  --text-muted: #999;
  --accent-color: #4F46E5;
  --accent-hover: #4338CA;
  --border-color: rgba(0, 0, 0, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.1);
  --shadow-hover: rgba(0, 0, 0, 0.2);
}

[data-theme="dark"] {
  --bg-primary: rgba(30, 30, 30, 0.95);
  --bg-secondary: rgba(40, 40, 40, 0.85);
  --bg-card: rgba(40, 40, 40, 0.9);
  --bg-overlay: rgba(0, 0, 0, 0.7);
  --text-primary: #ffffff;
  --text-secondary: #aaa;
  --text-muted: #666;
  --accent-color: #6366F1;
  --accent-hover: #4F46E5;
  --border-color: rgba(255, 255, 255, 0.1);
  --shadow-color: rgba(0, 0, 0, 0.3);
  --shadow-hover: rgba(0, 0, 0, 0.4);
}

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

body {
  font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', Roboto, 'Helvetica Neue', Arial, sans-serif;
  min-height: 100vh;
  background: var(--bg-primary);
  color: var(--text-primary);
  transition: background 0.3s, color 0.3s;
}

.background-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  z-index: -1;
  overflow: hidden;
}

#background-image {
  width: 100%;
  height: 100%;
  object-fit: cover;
  transition: opacity 1s ease-in-out;
}

.background-overlay {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: var(--bg-overlay);
}

.header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 16px 32px;
  position: relative;
}

.logo {
  display: flex;
  align-items: center;
  gap: 8px;
}

.logo-icon {
  width: 36px;
  height: 36px;
  object-fit: contain;
  border-radius: 8px;
}

.logo-text {
  font-size: 24px;
  font-weight: 700;
  color: #ffffff;
  text-shadow: 0 1px 3px rgba(0, 0, 0, 0.3);
}

.header-right {
  display: flex;
  align-items: center;
  gap: 12px;
}

.theme-toggle, .help-btn {
  background: transparent;
  border: none;
  color: var(--text-primary);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: background 0.2s;
}

.theme-toggle:hover, .help-btn:hover {
  background: var(--bg-secondary);
}

.moon-icon {
  display: none;
}

[data-theme="dark"] .moon-icon {
  display: inline;
}

[data-theme="dark"] .sun-icon {
  display: none;
}

.auth-section {
  display: flex;
  align-items: center;
  gap: 12px;
}

.login-btn, .register-btn {
  padding: 8px 16px;
  border: none;
  border-radius: 8px;
  cursor: pointer;
  font-size: 14px;
  font-weight: 500;
  transition: all 0.2s;
}

.login-btn {
  background: transparent;
  color: var(--text-primary);
}

.login-btn:hover {
  background: var(--bg-secondary);
}

.register-btn {
  background: var(--accent-color);
  color: white;
}

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

.user-menu {
  position: relative;
}

.user-avatar {
  width: 40px;
  height: 40px;
  border-radius: 50%;
  display: flex;
  align-items: center;
  justify-content: center;
  cursor: pointer;
  transition: transform 0.2s;
  background: var(--accent-color);
}

.user-avatar:hover {
  transform: scale(1.1);
}

#avatar-text {
  color: white;
  font-weight: 600;
  font-size: 16px;
}

.user-dropdown {
  position: absolute;
  top: 50px;
  right: 0;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-radius: 12px;
  padding: 16px;
  min-width: 200px;
  box-shadow: 0 4px 20px var(--shadow-color);
  z-index: 100;
  display: none;
}

.user-dropdown.show {
  display: block;
}

.user-dropdown-header {
  padding-bottom: 12px;
  border-bottom: 1px solid var(--border-color);
}

.user-dropdown-header .user-name {
  display: block;
  font-weight: 600;
  color: var(--text-primary);
}

.user-dropdown-header .user-bookmarks {
  display: block;
  font-size: 12px;
  color: var(--text-muted);
  margin-top: 4px;
}

.user-dropdown-items {
  margin-top: 12px;
}

.dropdown-item {
  display: flex;
  align-items: center;
  gap: 8px;
  width: 100%;
  padding: 8px;
  background: transparent;
  border: none;
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  transition: background 0.2s;
  font-size: 14px;
}

.dropdown-item:hover {
  background: var(--bg-secondary);
}

.main-content {
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  min-height: calc(100vh - 120px);
  padding: 20px;
}

.search-container {
  width: 100%;
  max-width: 700px;
  animation: fadeInUp 0.5s ease-out;
}

@keyframes fadeInUp {
  from {
    opacity: 0;
    transform: translateY(20px);
  }
  to {
    opacity: 1;
    transform: translateY(0);
  }
}

.search-box-wrapper {
  position: relative;
}

.search-box {
  display: flex;
  align-items: center;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 30px;
  padding: 4px 20px;
  transition: all 0.3s;
}

.search-box:focus-within {
  border-color: var(--accent-color);
  box-shadow: 0 0 0 3px rgba(79, 70, 229, 0.1), 0 0 20px rgba(79, 70, 229, 0.2);
  transform: scale(1.01);
}

#search-input {
  flex: 1;
  padding: 14px 16px;
  font-size: 16px;
  background: transparent;
  border: none;
  outline: none;
  color: var(--text-primary);
}

#search-input::placeholder {
  color: var(--text-muted);
}

.search-btn {
  background: var(--accent-color);
  border: none;
  border-radius: 50%;
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  color: white;
  cursor: pointer;
  transition: background 0.2s, transform 0.2s;
}

.search-btn:hover {
  background: var(--accent-hover);
  transform: scale(1.05);
}

.search-history-dropdown {
  position: absolute;
  top: calc(100% + 8px);
  left: 0;
  right: 0;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 16px;
  box-shadow: 0 4px 20px var(--shadow-color);
  display: none;
  z-index: 50;
}

.search-history-dropdown.show {
  display: block;
}

.dropdown-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 12px 16px;
  border-bottom: 1px solid var(--border-color);
}

.dropdown-header span {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
}

.clear-history {
  background: transparent;
  border: none;
  color: var(--text-muted);
  font-size: 12px;
  cursor: pointer;
  transition: color 0.2s;
}

.clear-history:hover {
  color: var(--text-primary);
}

.history-list {
  max-height: 300px;
  overflow-y: auto;
}

.history-item {
  display: flex;
  align-items: center;
  gap: 12px;
  padding: 12px 16px;
  cursor: pointer;
  transition: background 0.2s;
}

.history-item:hover {
  background: var(--bg-secondary);
}

.history-query {
  flex: 1;
  color: var(--text-primary);
  font-size: 14px;
}

.history-engine {
  font-size: 12px;
  color: var(--text-muted);
  background: var(--bg-secondary);
  padding: 2px 8px;
  border-radius: 10px;
}

.history-time {
  font-size: 12px;
  color: var(--text-muted);
}

.delete-history-item {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  opacity: 0;
  transition: opacity 0.2s;
}

.history-item:hover .delete-history-item {
  opacity: 1;
}

.delete-history-item:hover {
  color: #ef4444;
}

.engine-tabs {
  display: flex;
  justify-content: center;
  gap: 8px;
  margin-top: 16px;
  overflow-x: auto;
  padding-bottom: 8px;
}

.engine-tab {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  cursor: pointer;
  transition: all 0.2s;
  white-space: nowrap;
}

.engine-tab:hover {
  background: var(--bg-secondary);
}

.engine-tab.active {
  background: var(--accent-color);
  border-color: var(--accent-color);
}

.engine-tab.active .engine-icon,
.engine-tab.active .engine-name {
  color: white;
}

.engine-icon {
  width: 24px;
  height: 24px;
  border-radius: 6px;
  display: flex;
  align-items: center;
  justify-content: center;
  font-weight: 600;
  font-size: 12px;
  background: rgba(0, 0, 0, 0.1);
  color: var(--text-secondary);
}

.engine-name {
  font-size: 13px;
  color: var(--text-secondary);
}

.quick-sites {
  display: flex;
  justify-content: center;
  gap: 16px;
  margin-top: 24px;
  flex-wrap: wrap;
}

.quick-site {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 8px;
  padding: 12px;
  background: transparent;
  border: none;
  border-radius: 12px;
  cursor: pointer;
  transition: all 0.2s;
  min-width: 70px;
}

.quick-site:hover {
  background: var(--bg-card);
  transform: translateY(-2px);
}

.site-icon {
  width: 40px;
  height: 40px;
  display: flex;
  align-items: center;
  justify-content: center;
  border-radius: 12px;
  background: var(--bg-secondary);
  color: var(--accent-color);
}

.site-icon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 12px;
}

.quick-site span {
  font-size: 12px;
  color: var(--text-secondary);
}

.bookmarks-entry {
  display: flex;
  align-items: center;
  gap: 8px;
  margin-top: 20px;
  padding: 10px 20px;
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border: 1px solid var(--border-color);
  border-radius: 20px;
  color: var(--text-primary);
  cursor: pointer;
  transition: all 0.2s;
}

.bookmarks-entry:hover {
  background: var(--bg-secondary);
  transform: translateY(-2px);
}

.daily-quote {
  margin-top: 40px;
  text-align: center;
  max-width: 600px;
}

#quote-text {
  display: block;
  font-size: 16px;
  color: var(--text-secondary);
  font-style: italic;
}

#quote-author {
  display: block;
  font-size: 14px;
  color: var(--text-muted);
  margin-top: 8px;
}

.footer {
  text-align: center;
  padding: 16px;
  color: var(--text-muted);
  font-size: 13px;
}

.modal-overlay,
.bookmarks-modal-overlay,
.add-bookmark-modal-overlay,
.help-modal-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background: rgba(0, 0, 0, 0.6);
  backdrop-filter: blur(4px);
  display: none;
  align-items: center;
  justify-content: center;
  z-index: 200;
}

.modal-overlay.show,
.bookmarks-modal-overlay.show,
.add-bookmark-modal-overlay.show,
.help-modal-overlay.show {
  display: flex;
}

.modal {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  border-radius: 16px;
  width: 90%;
  max-width: 400px;
  box-shadow: 0 10px 40px var(--shadow-color);
  animation: modalFadeIn 0.3s ease-out;
}

@keyframes modalFadeIn {
  from {
    opacity: 0;
    transform: scale(0.95);
  }
  to {
    opacity: 1;
    transform: scale(1);
  }
}

.modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.modal-header h2 {
  font-size: 20px;
  color: var(--text-primary);
}

.modal-close {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 6px;
  transition: all 0.2s;
}

.modal-close:hover {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

.modal-body {
  padding: 24px;
}

.form-group {
  margin-bottom: 16px;
}

.form-group label {
  display: block;
  font-size: 14px;
  font-weight: 500;
  color: var(--text-primary);
  margin-bottom: 8px;
}

.form-group input,
.form-group select {
  width: 100%;
  padding: 12px;
  font-size: 14px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 10px;
  color: var(--text-primary);
  outline: none;
  transition: border-color 0.2s;
}

.form-group input:focus,
.form-group select:focus {
  border-color: var(--accent-color);
}

.submit-btn {
  width: 100%;
  padding: 14px;
  background: var(--accent-color);
  border: none;
  border-radius: 10px;
  color: white;
  font-size: 16px;
  font-weight: 500;
  cursor: pointer;
  transition: background 0.2s;
}

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

.form-link {
  margin-top: 16px;
  text-align: center;
  font-size: 14px;
  color: var(--text-secondary);
}

.form-link button {
  background: transparent;
  border: none;
  color: var(--accent-color);
  cursor: pointer;
  text-decoration: underline;
}

.form-link button:hover {
  color: var(--accent-hover);
}

.bookmarks-modal {
  width: 90%;
  max-width: 900px;
  max-height: 80vh;
  display: flex;
  flex-direction: column;
}

.bookmarks-modal-header {
  display: flex;
  justify-content: space-between;
  align-items: center;
  padding: 20px 24px;
  border-bottom: 1px solid var(--border-color);
}

.bookmarks-modal-header h2 {
  font-size: 20px;
  color: var(--text-primary);
}

.bookmarks-modal-body {
  flex: 1;
  overflow: hidden;
  display: flex;
  flex-direction: column;
}

.bookmarks-toolbar {
  display: flex;
  flex-wrap: wrap;
  gap: 12px;
  padding: 16px 24px;
  border-bottom: 1px solid var(--border-color);
  align-items: center;
}

.add-bookmark-btn {
  display: flex;
  align-items: center;
  gap: 6px;
  padding: 8px 16px;
  background: var(--accent-color);
  border: none;
  border-radius: 8px;
  color: white;
  cursor: pointer;
  transition: background 0.2s;
}

.add-bookmark-btn:hover {
  background: var(--accent-hover);
}

.filter-bar {
  display: flex;
  gap: 8px;
  flex: 1;
  min-width: 200px;
}

.filter-bar select,
.filter-bar input {
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

.filter-bar input {
  flex: 1;
  min-width: 150px;
}

.sort-bar {
  display: flex;
  align-items: center;
  gap: 8px;
}

.sort-bar select {
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  font-size: 14px;
  outline: none;
}

.export-btn {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
}

.export-btn:hover {
  background: var(--bg-card);
}

.import-label {
  display: flex;
  align-items: center;
  gap: 4px;
  padding: 8px 12px;
  background: var(--bg-secondary);
  border: 1px solid var(--border-color);
  border-radius: 8px;
  color: var(--text-primary);
  cursor: pointer;
  font-size: 14px;
  transition: background 0.2s;
}

.import-label:hover {
  background: var(--bg-card);
}

.bookmarks-grid {
  flex: 1;
  overflow-y: auto;
  padding: 24px;
  display: grid;
  grid-template-columns: repeat(auto-fill, minmax(220px, 1fr));
  gap: 16px;
}

.bookmark-card {
  background: var(--bg-secondary);
  border-radius: 12px;
  padding: 16px;
  cursor: pointer;
  transition: box-shadow 0.2s, border-color 0.2s;
  border: 1px solid transparent;
}

.bookmark-card:hover {
  box-shadow: 0 4px 12px var(--shadow-hover);
  border-color: var(--border-color);
}

.bookmark-header {
  display: flex;
  align-items: flex-start;
  gap: 10px;
}

.bookmark-favicon {
  width: 36px;
  height: 36px;
  border-radius: 8px;
  background: var(--bg-card);
  display: flex;
  align-items: center;
  justify-content: center;
  font-size: 18px;
}

.bookmark-favicon img {
  width: 100%;
  height: 100%;
  object-fit: contain;
  border-radius: 8px;
}

.bookmark-info {
  flex: 1;
  min-width: 0;
}

.bookmark-title {
  font-size: 14px;
  font-weight: 600;
  color: var(--text-primary);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.bookmark-url {
  font-size: 12px;
  color: var(--text-muted);
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
  margin-top: 2px;
}

.bookmark-tags {
  display: flex;
  flex-wrap: wrap;
  gap: 4px;
  margin-top: 10px;
}

.bookmark-tag {
  font-size: 10px;
  padding: 2px 6px;
  background: var(--bg-card);
  color: var(--text-secondary);
  border-radius: 4px;
}

.bookmark-footer {
  display: flex;
  justify-content: space-between;
  align-items: center;
  margin-top: 12px;
  padding-top: 12px;
  border-top: 1px solid var(--border-color);
}

.bookmark-category {
  font-size: 11px;
  color: var(--text-muted);
}

.bookmark-actions {
  display: flex;
  gap: 8px;
}

.bookmark-edit,
.bookmark-delete {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 4px;
  border-radius: 4px;
  transition: all 0.2s;
}

.bookmark-quick-toggle {
  background: transparent;
  border: none;
  color: var(--text-muted);
  cursor: pointer;
  padding: 8px;
  border-radius: 8px;
  transition: all 0.2s;
  min-width: 36px;
  min-height: 36px;
  display: flex;
  align-items: center;
  justify-content: center;
}

.bookmark-quick-toggle:hover {
  background: var(--bg-card);
  color: var(--accent-color);
}

.bookmark-quick-toggle svg {
  fill: var(--text-muted);
}

.bookmark-quick-toggle[data-is-quick="1"] svg {
  fill: var(--accent-color);
}

.bookmark-edit:hover {
  background: var(--bg-card);
  color: var(--accent-color);
}

.bookmark-delete:hover {
  background: var(--bg-card);
  color: #ef4444;
}

.shortcut-list {
  display: flex;
  flex-direction: column;
  gap: 12px;
}

.shortcut-item {
  display: flex;
  justify-content: space-between;
  align-items: center;
}

.shortcut-item kbd {
  background: var(--bg-secondary);
  padding: 6px 12px;
  border-radius: 6px;
  font-family: monospace;
  font-size: 13px;
  color: var(--text-primary);
  border: 1px solid var(--border-color);
}

.shortcut-item span {
  color: var(--text-secondary);
}

.toast-container {
  position: fixed;
  bottom: 20px;
  right: 20px;
  z-index: 300;
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.toast {
  background: var(--bg-card);
  backdrop-filter: blur(20px);
  padding: 12px 20px;
  border-radius: 10px;
  box-shadow: 0 4px 20px var(--shadow-color);
  display: flex;
  align-items: center;
  gap: 10px;
  animation: toastSlideIn 0.3s ease-out;
  max-width: 300px;
}

@keyframes toastSlideIn {
  from {
    opacity: 0;
    transform: translateX(100%);
  }
  to {
    opacity: 1;
    transform: translateX(0);
  }
}

.toast-success {
  border-left: 4px solid #10B981;
}

.toast-error {
  border-left: 4px solid #EF4444;
}

.toast-info {
  border-left: 4px solid #3B82F6;
}

.toast-message {
  font-size: 14px;
  color: var(--text-primary);
}

@media (max-width: 768px) {
  .header {
    padding: 12px 16px;
  }

  .logo-text {
    font-size: 20px;
  }

  .login-btn, .register-btn {
    padding: 6px 12px;
    font-size: 13px;
  }

  .search-container {
    max-width: 100%;
  }

  .search-box {
    padding: 4px 12px;
  }

  #search-input {
    padding: 12px;
    font-size: 15px;
  }

  .engine-tabs {
    justify-content: flex-start;
  }

  .engine-name {
    display: none;
  }

  .engine-icon {
    width: 32px;
    height: 32px;
    font-size: 14px;
  }

  .quick-sites {
    gap: 12px;
  }

  .quick-site {
    min-width: 60px;
  }

  .site-icon {
    width: 36px;
    height: 36px;
  }

  .modal {
    width: 95%;
  }

  .bookmarks-modal {
    width: 95%;
  }

  .bookmarks-grid {
    grid-template-columns: repeat(auto-fill, minmax(150px, 1fr));
    padding: 16px;
    gap: 12px;
  }

  .bookmarks-toolbar {
    flex-direction: column;
    align-items: stretch;
  }
}