/* Navbar */
.custom-navbar {
  background-color: var(--bg-surface);
  border-bottom: 1px solid var(--border-color);
  height: 60px;
}

.brand-icon {
  color: var(--primary);
  display: flex;
  align-items: center;
}

/* Buttons */
.btn-icon {
  background: transparent;
  border: none;
  color: var(--text-muted);
  padding: 0.5rem;
  border-radius: var(--radius-md);
  display: flex;
  align-items: center;
  justify-content: center;
  transition: all 0.2s;
}

.btn-icon:hover {
  background-color: var(--bg-surface-hover);
  color: var(--text-main);
}

/* Search */
.search-wrapper {
  max-width: 500px;
  position: relative;
}

.search-bar .form-control,
.search-bar .input-group-text {
  background-color: var(--bg-surface-hover);
  border-color: var(--border-color);
  color: var(--text-main);
}

.search-bar .form-control:focus {
  box-shadow: none;
  background-color: var(--bg-surface);
  border-color: var(--primary);
}

.search-bar .input-group-text {
  color: var(--text-muted);
}

.search-bar kbd {
  font-family: var(--font-sans);
  font-size: 0.75rem;
  padding: 0.2rem 0.4rem;
  box-shadow: 0 1px 1px rgba(0, 0, 0, 0.1);
}

.search-results-dropdown {
  position: absolute;
  top: 100%;
  left: 0;
  right: 0;
  margin-top: 0.5rem;
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  max-height: 400px;
  overflow-y: auto;
  overflow-x: hidden;
  z-index: 1050;
}

.search-result-item {
  padding: 0.75rem 1rem;
  border-bottom: 1px solid var(--border-color);
  cursor: pointer;
  transition: background-color 0.2s;
}

.search-result-item:last-child {
  border-bottom: none;
}

.search-result-item:hover {
  background-color: var(--bg-surface-hover);
}

/* Sidebar & Tabs */
.paper-tabs .nav-link {
  color: var(--text-muted);
  border-radius: var(--radius-md);
  padding: 0.5rem;
  font-weight: 500;
}

.paper-tabs .nav-link.active {
  background-color: var(--primary);
  color: var(--text-inverse);
}

.chapter-list .list-group-item {
  background-color: transparent;
  border-color: var(--border-color);
  color: var(--text-main);
  cursor: pointer;
  border-radius: var(--radius-md) !important;
  margin-bottom: 0.25rem;
  border: none;
  transition: background-color 0.2s;
}

.chapter-list .list-group-item:hover {
  background-color: var(--bg-surface-hover);
}

.chapter-list .list-group-item.active {
  background-color: var(--primary-light);
  color: var(--primary);
  font-weight: 600;
  border-left: 3px solid var(--primary);
  border-radius: 0 var(--radius-md) var(--radius-md) 0 !important;
}

/* Formula Cards */
.formula-card {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-lg);
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease,
    border-color 0.2s;
  cursor: pointer;
  height: 100%;
  display: flex;
  flex-direction: column;
}

.formula-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
  border-color: var(--primary);
}

.formula-card-body {
  padding: 1.5rem;
  flex-grow: 1;
  display: flex;
  flex-direction: column;
}

.formula-card .latex-preview {
  font-size: 1.25rem;
  margin: 1.5rem 0;
  text-align: center;
  flex-grow: 1;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--text-main);
}

.card-badges {
  display: flex;
  gap: 0.5rem;
  flex-wrap: wrap;
}

.badge-custom {
  font-size: 0.7rem;
  font-weight: 600;
  padding: 0.35em 0.65em;
  border-radius: 4px;
  background-color: var(--bg-surface-active);
  color: var(--text-muted);
}

/* Modals */
.custom-modal .modal-content {
  background-color: var(--bg-surface);
  border: 1px solid var(--border-color);
  border-radius: var(--radius-xl);
  color: var(--text-main);
}

.custom-modal .modal-header {
  border-bottom-color: var(--border-color);
}

.custom-modal .btn-close {
  filter: invert(var(--invert-close-btn, 0));
}

.custom-tabs {
  border-bottom-color: var(--border-color);
}
.custom-tabs .nav-link {
  color: var(--text-muted);
  border: none;
  border-bottom: 2px solid transparent;
  padding: 0.75rem 1rem;
}
.custom-tabs .nav-link:hover {
  border-color: transparent;
  color: var(--text-main);
}
.custom-tabs .nav-link.active {
  background-color: transparent;
  border-color: var(--primary);
  color: var(--primary);
  font-weight: 600;
}

.variable-table {
  color: var(--text-main);
}
.variable-table td {
  padding: 0.75rem 0;
  border-bottom: 1px dashed var(--border-color);
}
.variable-table tr:last-child td {
  border-bottom: none;
}

/* Accordion */
.custom-accordion .accordion-item {
  background-color: transparent;
  border-color: var(--border-color);
  margin-bottom: 0.5rem;
  border-radius: var(--radius-md) !important;
  overflow: hidden;
}
.custom-accordion .accordion-button {
  background-color: var(--bg-surface-hover);
  color: var(--text-main);
  box-shadow: none;
}
.custom-accordion .accordion-button:not(.collapsed) {
  background-color: var(--primary-light);
  color: var(--primary);
}
.custom-accordion .accordion-button::after {
  filter: invert(var(--invert-close-btn, 0));
}
.custom-accordion .accordion-body {
  background-color: var(--bg-surface);
}

/* Topic Filters */
.topic-btn {
  white-space: nowrap;
  border-radius: 20px;
  border: 1px solid var(--border-color);
  background-color: var(--bg-surface);
  color: var(--text-main);
  padding: 0.35rem 1rem;
  transition: all 0.2s;
}
.topic-btn:hover {
  background-color: var(--bg-surface-hover);
}
.topic-btn.active {
  background-color: var(--text-main);
  color: var(--bg-surface);
  border-color: var(--text-main);
}

/* Offcanvas */
.custom-offcanvas {
  background-color: var(--bg-surface);
  color: var(--text-main);
}
.custom-offcanvas .offcanvas-header {
  border-bottom-color: var(--border-color);
}

/* Lab View Styles */
#labGrid .formula-card {
  transition:
    transform 0.2s ease,
    box-shadow 0.2s ease;
  cursor: default;
}

#labGrid .formula-card:hover {
  transform: none;
  box-shadow: var(--shadow-sm);
}

.bg-primary-light {
  background-color: rgba(79, 70, 229, 0.08);
}

.x-small {
  font-size: 0.7rem;
}

.form-range-sm {
  height: 1rem;
}

.form-range-sm::-webkit-slider-thumb {
  width: 12px;
  height: 12px;
}

.form-range-sm::-moz-range-thumb {
  width: 12px;
  height: 12px;
}

.nav-tab-btn {
  border-radius: 20px;
  padding-left: 1rem;
  padding-right: 1rem;
}

.nav-tab-btn.active {
  background-color: var(--primary) !important;
  color: white !important;
}