:root {
  /* Base palette */
  --bg-1: #24273a;      /* page background */
  --bg-2: #f4dbd6;    /* panels, cards, nav */
  --bg-3: #7287fd;     /* accents (badges, progress, logo) */

  --txt-1: #24273a;     /* default text on light surfaces */
  --txt-2: #f4dbd6;   /* secondary text */
  --txt-3: #7287fd;      /* links and hovers */

  /* Chessboard colors */
  --board-light: #a07d51;
  --board-dark: #4c321f;
  --bg-color-4: rgba(158, 154, 65, 0.5);
  --bg-color-5: rgba(117, 137, 24, 0.4);
  --bg-color-6: rgba(0, 0, 0, 0.5);
  --bg-color-7: rgba(227, 11, 11, 0.7);
  --bg-color-8: rgba(207, 181, 144, 0.5);
}


.btn-light {
  background-color: var(--bg-2);
  color: var(--txt-1);
  border-color: var(--bg-1);
}

.btn-light:hover {
  background-color: var(--bg-3);
  color: var(--txt-1) !important;
  border-color: var(--bg-2);
}

.btn-light.active {
  background-color: var(--bg-3);
  color: var(--txt-1) !important;
  border-color: var(--bg-2);
}

.btn-dark {
  background-color: var(--bg-1);
  color: var(--txt-2);
  border-color: var(--bg-2);
}

.btn-dark:hover {
  background-color: var(--bg-3);
  color: var(--txt-1) !important;
  border-color: var(--bg-2);
}

.light {
  background-color: var(--bg-2);
  color: var(--txt-1) !important;
}

.dark {
  background-color: var(--bg-1) !important;
  color: var(--txt-2);
}

/* Global link styling and transitions */
a,
.nav-link,
.dropdown-item,
{
  color: var(--txt-2);
  transition: color 0.5s ease-in-out;
  text-decoration: none !important;
}

a {
  color: var(--txt-2);
  transition: color 0.5s ease-in-out;
  text-decoration: none !important;
}

a:hover {
  color: var(--txt-3) !important;
}


a:hover,
.nav-link:hover,
.dropdown-item:hover,
{
  color: var(--txt-3) !important;
}

.dropdown-item.active {
  background-color: var(--bg-3);
}

.dropdown-menu.show {
  background-color: var(--bg-2);
  color: var(--txt-1) !important;
}

body {
  font-family: 'Cascadia Mono', 'Cascadia Code', ui-monospace, SFMono-Regular, Menlo, Monaco, Consolas, 'Liberation Mono', 'Courier New', monospace;
  background-color: var(--bg-1);
  color: var(--txt-1);
  text-align: center;
}

h1 {
  color: var(--txt-1);
}

#board {
  width: 100%;
  max-width: 100%;
  flex: 0 0 auto;
  position: relative;
}

.form-txt-cl {
  color: var(--txt-1);
}

.navbar-brand img {
  max-height: 40px;
}

#modeToggle, #nav, #uploadForm, #themeSelectorContainer {
  margin-top: 10px;
}

/* Fixed board colors */
.white-1e1d7 {
  background-color: var(--board-light) !important;
  color: black;
}

.black-3c85d {
  background-color: var(--board-dark) !important;
  color: var(--board-light);
}

.chessboard-63f37 .highlight1-32417,
.chessboard-63f37 .highlight2-9c5d2 {
  background-color: var(--bg-color-8) !important;
  box-shadow: none !important;
}

#trainingArea {
  display: flex;
  justify-content: center;
  align-items: center;
}

#sidePanel .panel-content {
  background-color: var(--bg-2);
  width: 100%;
  box-shadow: inset 0 0 5px var(--bg-color-6);
}

@media (max-width: 768px) {
  #sidePanel {
    margin-left: 0;
    margin-top: 20px;
  }
}

#sideButtons {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

#commentToast {
  background-color: var(--bg-3);
  color: var(--txt-1);
}

#completedBtn {
  background-color: var(--bg-2);
  color: var(--txt-1);
  border: none;
}

#completionPercent {
  background-color: var(--bg-3) !important;
  color: var(--txt-1);
  border: none;
}

#progress {
  margin-bottom: 10px;
}

#themeSelectorContainer {
  position: absolute;
  top: 10px;
  left: 10px;
  font-size: 12px;
}

#themeSelectorContainer select {
  font-size: 12px;
  padding: 4px 8px;
}


.square-55d63.highlight-last {
  background-color: var(--bg-color-4) !important;
}

.square-55d63.highlight-selected {
  background-color: var(--bg-color-5) !important;
}

.square-55d63.hint {
  background-color: var(--bg-color-5) !important;
}

.square-55d63.move-option::after {
  content: '';
  position: absolute;
  width: 30%;
  height: 30%;
  border-radius: 50%;
  background: var(--bg-color-6);
  top: 35%;
  left: 35%;
}

.square-55d63.capture-option {
  background-color: var(--bg-color-7) !important;
}

#arrowLayer {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 2;
}

.square-55d63.csl-red {
  box-shadow: inset 0 0 0 4px rgba(255, 0, 0, 0.7);
}

.square-55d63.csl-green {
  box-shadow: inset 0 0 0 4px rgba(0, 170, 0, 0.7);
}

.square-55d63.csl-yellow {
  box-shadow: inset 0 0 0 4px rgba(255, 255, 0, 0.7);
}

.square-55d63.csl-blue {
  box-shadow: inset 0 0 0 4px rgba(0, 0, 255, 0.7);
}

#modeToggle {
  display: flex;
  flex-direction: column;
  align-items: center;
  gap: 4px;
}

#modeBtn {
  background-color: var(--bg-2);
  border-radius: 4px;
  padding: 8px 12px;
  cursor: pointer;
  width: 200px;
  display: flex;
  flex-direction: column;
  align-items: center;
  text-align: center;
  color: var(--txt-1);
  border: 1px solid var(--txt-1);
}

#modeBtn:hover {
  background-color: var(--bg-3);
}

#modeBtn i {
  font-size: 20px;
  margin-bottom: 4px;
}

#modeBtn .label {
  font-weight: bold;
}

#modeDescription {
  font-size: 12px;
  max-width: 250px;
}

.move-feedback {
  position: absolute;
  top: 0;
  right: 0;
  transform: translate(50%, -50%);
  font-size: 26px;
  display: flex;
  align-items: center;
  justify-content: center;
  pointer-events: none;
  z-index: 2;
}

.move-feedback.correct::before {
  content: '✅';
}

.move-feedback.incorrect::before {
  content: '❌';
}

.navbar {
  background-color: var(--bg-2);
}

.navbar .container-fluid {
  position: relative;
}

.navbar .navbar-text.center {
  position: absolute;
  left: 50%;
  top: 50%;
  transform: translate(-50%, -50%);
  margin: 0;
}

.navbar .navbar-brand,
.navbar .nav-link,
.navbar .dropdown-item {
  color: var(--txt-1) !important;
}

.navbar .dropdown-menu {
  background-color: var(--bg-2);
}

.navbar .dropdown-item:hover {
  background-color: var(--bg-3);
}

.modal-content {
  background-color: var(--bg-3) !important;
  color: var(--txt-1);
}

.text-success {
  color: var(--txt-2) !important;
}

.text-light,
.text-secondary,
.form-text,
.text-muted {
  color: var(--txt-1) !important;
}

.progress-bar {
  background-color: var(--bg-3) !important;
}

/* Buttons - overridable via variables */
.btn,
.btn:focus {
  transition: background-color 0.3s ease, color 0.3s ease, border-color 0.3s ease;
}

.form-label {
  color: var(--txt-1);
}

.form-control {
  background-color: var(--bg-2);
  color: var(--txt-1);
  border-color: var(--txt-1);
}

.form-control:focus {
  background-color: var(--bg-2);
  color: var(--txt-1);
}

.loading-overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 0.8);
  display: flex;
  flex-direction: column;
  align-items: center;
  justify-content: center;
  z-index: 1050;
}

/* Make cards indicate click action when entire card is clickable */
.clickable-card { cursor: pointer; }

/* Card title behaves like link; changes on card hover */
.study-card .card-title {
  color: var(--txt-1);
  transition: color 0.5s ease-in-out;
}

.study-card.clickable-card:hover .card-title {
  color: var(--txt-3) !important;
}

/* Drill link + arrow styles to match title */
.study-card .drill-link,
.study-card .drill-link .drill-icon {
  color: var(--txt-1);
  transition: color 0.5s ease-in-out;
}

.study-card.clickable-card:hover .drill-link,
.study-card.clickable-card:hover .drill-link .drill-icon {
  color: var(--txt-3) !important;
}

/* Increase home card height */
.study-card {
  min-height: 450px;
  transition: transform 0.2s ease, box-shadow 0.3s ease;
}

@media (max-width: 576px) {
  .study-card { min-height: 320px; }
}

.study-card.clickable-card:hover {
  transform: translateY(-3px);
  box-shadow: 0 12px 28px rgba(0, 0, 0, 0.25), 0 8px 8px rgba(0, 0, 0, 0.15);
  outline: 1px solid var(--link-hover-color);
  outline-offset: 0;
}