/* Board square colors (theme-aware) */
:root {
  --sq-light: #cbd5e1;
  --sq-dark: var(--accent);
}

:root[data-theme="light"] {
  --sq-light: #e2e8f0;
}

#app {
  max-width: 800px;
  width: 100%;
  padding: 1rem;
  background: var(--bg-card);
  border: 0.063rem solid var(--bg-border);
  box-shadow: var(--shadow);
  border-radius: var(--radius);
  transition:
    background-color 0.3s ease,
    border-color 0.3s ease;
}

#turn-indicator {
  text-align: center;
  font-size: 1.2rem;
  font-weight: 600;
  color: var(--text-primary);
  margin-bottom: 0.5rem;
}

.controls {
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
  justify-content: center;
  margin-bottom: 1rem;
}

.controls button {
  padding: 0.5rem 1rem;
  border: 0.063rem solid transparent;
  background: var(--accent);
  color: #f8fafc;
  font-weight: 600;
  border-radius: 0.5rem;
  cursor: pointer;
  transition:
    background-color 0.3s ease,
    transform 0.3s ease,
    box-shadow 0.3s ease;
}

.controls button:hover {
  background: var(--accent-dark);
  transform: translateY(-0.125rem);
  box-shadow: var(--accent-hover-shadow);
}

#difficulty-label {
  display: flex;
  align-items: center;
  gap: 0.4rem;
  padding: 0.5rem 1rem;
  color: var(--text-primary);
  font-weight: 600;
}

#difficulty-select {
  padding: 0.3rem 0.5rem;
  border: 0.063rem solid var(--bg-border);
  border-radius: 0.4rem;
  background: var(--bg-card);
  color: var(--text-primary);
  font-weight: 600;
  cursor: pointer;
}

.scoreboard {
  display: flex;
  justify-content: space-between;
  margin-bottom: 0.5rem;
  color: var(--text-secondary);
}

.scoreboard div {
  font-weight: bold;
}

#captured-white,
#captured-black {
  display: flex;
  gap: 0.2rem;
  min-height: 1.5rem;
}

.captured-piece {
  font-size: 1.2rem;
}

#chess-board {
  display: grid;
  grid-template-columns: repeat(8, 1fr);
  grid-template-rows: repeat(8, 1fr);
  width: 100%;
  max-width: 26rem;
  margin: 0 auto;
  aspect-ratio: 1;
  border: 2px solid var(--bg-border);
  border-radius: 0.25rem;
  overflow: hidden;
  height: auto;
}

.square {
  display: flex;
  align-items: center;
  justify-content: center;
  position: relative;
  min-height: 0;
  padding: 0;
  border: 0;
  font: inherit;
  cursor: pointer;
}

.light {
  background: var(--sq-light);
}

.dark {
  background: var(--sq-dark);
}

.notation {
  position: absolute;
  font-size: 0.6rem;
  bottom: 2px;
  right: 4px;
  color: rgba(15, 23, 42, 0.55);
}

.piece {
  font-size: 2.6rem;
  color: #0f172a;
  cursor: pointer;
  -webkit-user-select: none;
  user-select: none;
}

.selected {
  outline: 3px solid var(--accent-light);
  outline-offset: -3px;
}

.move-highlight {
  background: var(--color-success) !important;
}

.capture-highlight {
  background: rgba(239, 68, 68, 0.45) !important;
}

#toast-alert {
  position: fixed;
  bottom: 1rem;
  right: 1rem;
  display: flex;
  flex-direction: column;
  gap: 0.5rem;
  z-index: 1000;
}

.toast {
  min-width: 200px;
  padding: 0.5rem 1rem;
  background: var(--bg-card);
  color: var(--text-primary);
  border: 1px solid var(--accent);
  border-radius: var(--radius);
  box-shadow: var(--shadow);
  animation: fade-in-out 3s forwards;
}

.toast.capture {
  border-color: var(--color-success-text);
}

.toast.error {
  border-color: var(--color-error);
}

.toast.warning {
  border-color: #f39c12;
}

@keyframes fade-in-out {
  0%,
  100% {
    opacity: 0;
    transform: translateY(20px);
  }

  10% {
    opacity: 1;
    transform: translateY(0);
  }

  90% {
    opacity: 1;
  }

}

.chess-subdialog {
  display: none;
}

.modal-content {
  padding: 1rem;
  border-radius: var(--radius);
  width: 90%;
  max-width: 500px;
  max-height: 80%;
  overflow-y: auto;
}

#promotion-id .modal-content {
  max-width: 320px;
}

#promotion-id h3 {
  margin: 0.2rem 0 1rem;
  font-size: 1.2rem;
}

.promotion-option {
  font-size: 2.2rem;
  margin: 0.3rem 0.4rem;
  cursor: pointer;
  display: inline-block;
  padding: 0.25rem 0.5rem;
  border: 1px solid var(--bg-border);
  border-radius: 0.35rem;
  background: var(--bg-secondary);
  color: var(--text-primary);
  line-height: 1;
  transition: transform 0.15s;
}

.promotion-option:hover {
  transform: scale(1.2);
}

#history-table {
  width: 100%;
  border-collapse: collapse;
  margin-top: 0.5rem;
}

#history-table th,
#history-table td {
  border: 1px solid var(--bg-border);
  padding: 0.5rem;
  text-align: center;
}

#history-table th {
  background: var(--bg-secondary);
  color: var(--text-primary);
}

@media (max-width: 600px) {
  #chess-board {
    max-width: 100%;
  }

  .piece {
    font-size: 1.95rem;
  }

  .controls {
    flex-direction: column;
  }
}