.section-lesson {
  padding: 2rem 1rem;
  min-height: calc(69vh - 110px - 110px);
  background:
  radial-gradient(900px circle at 10% 10%, rgba(13, 110, 253, 0.22), transparent 40%),
  radial-gradient(800px circle at 90% 20%, rgba(102, 16, 242, 0.20), transparent 42%),
  radial-gradient(900px circle at 40% 90%, rgba(32, 201, 151, 0.18), transparent 45%),
  linear-gradient(180deg, rgba(255,255,255,0.02), rgba(0,0,0,0.02));
}

.section-cards {
  position: relative;
  background-color: var(--bs-body-bg);
  overflow: hidden;
}


.section-cards::before {
  content: "";
  position: absolute;
  inset: 0;
  background: 
    radial-gradient(
      circle at 20% 30%, 
      rgba(var(--bs-primary-rgb), 0.08), 
      transparent 40%
    ),
    radial-gradient(
      circle at 80% 70%, 
      rgba(var(--bs-danger-rgb), 0.08), 
      transparent 40%
    );
  pointer-events: none;
}

.section-cards > .container {
  position: relative;
  z-index: 1;
}


.card-lang-chip {
  width: 29px; height: 29px;
  display: inline-flex; align-items: center; justify-content: center;
  border-radius: 999px;
  color: rgba(255, 255, 255, 0.68);
  text-decoration: none;
  font-size: 0.8rem;
  opacity: 0.5;
}

html[data-bs-theme="light"] .card-lang-chip {
  background: rgba(15, 23, 42, 0.04);
  border-color: rgba(15, 23, 42, 0.12);
  color: rgba(15, 23, 42, 0.86);
}
.card-lang-chip:hover {
  transform: translateY(-1px);
  opacity: 1;
}
html[data-bs-theme="light"] .card-lang-chip:hover {

}

.tooltip.card-lang-tooltip {
  --bs-tooltip-zindex: 2000;
  --bs-tooltip-opacity: 1;
  --bs-tooltip-bg: var(--bs-body-bg);
  --bs-tooltip-color: var(--bs-body-color);
}


.tooltip.card-lang-tooltip .tooltip-inner{
  border: 1px solid rgba(var(--bs-body-color-rgb), .18);
  box-shadow:
    0 .35rem 1rem rgba(0,0,0,.22),
    0 0 0.9rem rgba(var(--bs-primary-rgb), .20);
}

.tooltip.card-lang-tooltip[data-popper-placement^="left"]{
  margin-right: .95rem;
}

.tooltip.card-lang-tooltip[data-popper-placement^="left"] .tooltip-arrow::before{
  border-left-color: var(--bs-tooltip-bg);
}

.tooltip.card-lang-tooltip[data-popper-placement^="left"] .tooltip-arrow::after{
  content: "";
  position: absolute;
  border-style: solid;
  border-color: transparent;
  border-width: .45rem 0 .45rem .45rem;
  border-left-color: rgba(var(--bs-body-color-rgb), .18);
  right: -1px;
  top: -1px;
  z-index: -1;
}

.pagination-container {
  padding: 1rem 0;
}

.pagination {
  display: flex;
  gap: 0.3rem;
  justify-content: center;
  padding: 1rem 0;
}

.pagination .page-link {
  border-radius: 0.5rem;
  border: 1px solid transparent;
  transition: all 0.3s ease;
  padding: 0.5rem 0.8rem;
  font-weight: 500;
}

body.light-mode .pagination .page-link {
  color: #495057;
  background-color: #fff;
}

body.light-mode .pagination .page-item.active .page-link {
  color: #fff;
  background-color: #0d6efd;
  border-color: #0d6efd;
  box-shadow: 0 0.2rem 0.5rem rgba(13, 110, 253, 0.25);
}

body.light-mode .pagination .page-link:hover:not(.disabled):not(.active) {
  color: #fff;
  background-color: #0b5ed7;
  border-color: #0a58ca;
}

body.light-mode .pagination .page-item.disabled .page-link {
  color: #adb5bd;
  background-color: #f8f9fa;
  cursor: not-allowed;
}

body.dark-mode {
  background-color: #121212;
  color: #e0e0e0;
}

body.dark-mode .pagination .page-link {
  color: #e0e0e0;
  background-color: #1e1e1e;
  border-color: #333;
}

body.dark-mode .pagination .page-item.active .page-link {
  color: #fff;
  background-color: #0d6efd;
  border-color: #0d6efd;
  box-shadow: 0 0.2rem 0.5rem rgba(13, 110, 253, 0.5);
}

body.dark-mode .pagination .page-link:hover:not(.disabled):not(.active) {
  color: #fff;
  background-color: #0b5ed7;
  border-color: #0a58ca;
}

body.dark-mode .pagination .page-item.disabled .page-link {
  color: #6c757d;
  background-color: #2c2c2c;
  cursor: not-allowed;
}

.pagination .bi {
  vertical-align: middle;
}

/* subject buttons */
.lesson-subject-buttons .btn,
.sb-button {
  position: relative;
  display: inline-block;
  width: 240px;
  padding: 6px 12px;
  text-align: left;
  font-weight: 500;
  border-radius: 0.5rem;
  border: 1px solid;
  transition: all 0.3s ease;
  cursor: pointer;
}

html[data-bs-theme="light"] .lesson-subject-buttons .btn,
html[data-bs-theme="light"] .sb-button {
  background-color: #fff;
  color: #111;
  border-color: rgba(0,0,0,0.1);
}

html[data-bs-theme="dark"] .lesson-subject-buttons .btn,
html[data-bs-theme="dark"] .sb-button {
  background-color: var(--surface);
  color: var(--muted);
  border-color: var(--border);
}

.lesson-subject-buttons {
  padding: 30px 10px 20px 10px;
  display: flex;
  flex-wrap: wrap;
  gap: 20px;
  justify-content: center;
}

.lesson-subject-buttons .btn:hover:not(.disabled),
.sb-button:hover:not(.disabled) {
  background-color: rgba(13, 110, 253, 0.15);
  color: #0d6efd;
  border-color: #0d6efd;
}

.sb-button-label {
  position: absolute;
  top: 0;
  right: 0;
  width: 44px;
  padding: 6px 12px;
  text-align: right;
  border-left: 1px solid;
  border-radius: 0 0.3rem 0.3rem 0;
  font-weight: 600;
}

html[data-bs-theme="light"] .sb-button-label {
  background: rgba(0,0,0,0.08);
  color: #111;
  border-color: rgba(0,0,0,0.1);
}

html[data-bs-theme="dark"] .sb-button-label {
  background: rgba(255,255,255,0.08);
  color: #e0e0e0;
  border-color: var(--border);
}

.sb-button.disabled,
.lesson-subject-buttons .btn.disabled {
  opacity: 0.6;
  cursor: not-allowed;
}

html[data-bs-theme="light"] .sb-button.disabled,
html[data-bs-theme="light"] .lesson-subject-buttons .btn.disabled {
  background-color: #f6f8fb;
  color: rgba(0,0,0,0.35);
  border-color: rgba(0,0,0,0.1);
}

html[data-bs-theme="dark"] .sb-button.disabled,
html[data-bs-theme="dark"] .lesson-subject-buttons .btn.disabled {
  background-color: var(--bg-1);
  color: rgba(255,255,255,0.35);
  border-color: var(--border);
}

/* tooltip card content info */

.card-info-icon {
  display: inline-block;
  padding: 0 6px 0 2px;
  cursor: help;
}

.tooltip.tooltip-card-content-info{
  --bs-tooltip-zindex: 2000;
  --bs-tooltip-opacity: 1;
  --bs-tooltip-bg: var(--bs-body-bg);
  --bs-tooltip-color: var(--bs-body-color);
}

.tooltip.tooltip-card-content-info .tooltip-inner{
  border: 1px solid rgba(var(--bs-body-color-rgb), .18);
  box-shadow:
    0 .35rem 1rem rgba(0,0,0,.22),
    0 0 0.9rem rgba(var(--bs-primary-rgb), .20);
}

.tooltip.tooltip-card-content-info[data-popper-placement^="bottom"]{
  margin-top: .95rem;
}

.tooltip.tooltip-card-content-info .tooltip-arrow::before{
  border-bottom-color: var(--bs-tooltip-bg);
}

.tooltip.tooltip-card-content-info .tooltip-inner{
  border: 1px solid rgba(var(--bs-body-color-rgb), .18);
}

.tooltip.tooltip-card-content-info[data-popper-placement^="bottom"] .tooltip-arrow::after{
  content: "";
  position: absolute;
  border-style: solid;
  border-color: transparent;
  border-width: 0 .45rem .45rem;
  border-bottom-color: rgba(var(--bs-body-color-rgb), .18);
  top: -1px;
  left: -1px;
  z-index: -1;
}

.lesson-container-page-numbers {
  padding: 1rem;
}

.lesson-container-search-question {
  margin-bottom: 2rem;
}