.lc-app {
  --lc-bg: #ffffff;
  --lc-panel: #ffffff;
  --lc-border: #d9d9d9;
  --lc-text: #1b1b1b;
  --lc-muted: #666666;
  --lc-input-bg: #ffffff;
  max-width: 1080px;
  margin: 0 auto;
  padding: 0.75rem;
  color: var(--lc-text);
  background: var(--lc-bg);
}

body.dark .lc-app {
  --lc-bg: #0f1115;
  --lc-panel: #161b22;
  --lc-border: #2f3742;
  --lc-text: #e6edf3;
  --lc-muted: #9da7b3;
  --lc-input-bg: #0f141a;
}

.lc-loading {
  padding: 1rem;
  border: 1px solid var(--lc-border);
  border-radius: 8px;
  background: var(--lc-panel);
}

.lc-grid {
  display: grid;
  grid-template-columns: repeat(auto-fit, minmax(280px, 1fr));
  gap: 12px;
}

.lc-card {
  border: 1px solid var(--lc-border);
  border-radius: 10px;
  padding: 12px;
  background: var(--lc-panel);
}

.lc-title {
  margin: 0 0 0.5rem;
  font-size: 1rem;
}

.lc-muted {
  color: var(--lc-muted);
  font-size: 0.9rem;
}

.lc-controls {
  display: flex;
  flex-wrap: wrap;
  gap: 8px;
  margin: 8px 0;
}

.lc-input,
.lc-select,
.lc-button {
  border: 1px solid var(--lc-border);
  border-radius: 8px;
  padding: 8px 10px;
  font: inherit;
}

.lc-input,
.lc-select {
  min-width: 140px;
  background: var(--lc-input-bg);
  color: var(--lc-text);
}

.lc-button {
  background: var(--lc-input-bg);
  cursor: pointer;
  color: var(--lc-text);
}

.lc-button:hover {
  filter: brightness(1.08);
}

.lc-button:disabled {
  cursor: not-allowed;
  opacity: 0.65;
}

.lc-button-primary {
  background: #1f6feb;
  color: #fff;
  border-color: #1f6feb;
}

.lc-button-primary:hover {
  background: #175cca;
}

.lc-row {
  display: flex;
  justify-content: space-between;
  gap: 8px;
  align-items: center;
  flex-wrap: wrap;
}

.lc-pill {
  display: inline-block;
  border-radius: 999px;
  border: 1px solid var(--lc-border);
  padding: 2px 9px;
  font-size: 0.75rem;
}

.lc-pill-easy {
  border-color: #22863a;
  color: #22863a;
}

.lc-pill-medium {
  border-color: #bf8700;
  color: #bf8700;
}

.lc-pill-hard {
  border-color: #cb2431;
  color: #cb2431;
}

.lc-question-list {
  display: grid;
  gap: 10px;
}

.lc-question {
  border: 1px solid var(--lc-border);
  border-radius: 10px;
  padding: 10px;
  background: var(--lc-panel);
}

.lc-question-done {
  border-color: var(--lc-border);
  background: var(--lc-panel);
  box-shadow: inset 4px 0 0 #2ea043;
}

.lc-question-not-done {
  border-color: var(--lc-border);
  background: var(--lc-panel);
}

.lc-link {
  color: #1f6feb;
  text-decoration: none;
}

.lc-link:hover {
  text-decoration: underline;
}

.lc-toast-wrap {
  position: fixed;
  right: 16px;
  bottom: 16px;
  z-index: 9999;
  display: grid;
  gap: 8px;
}

.lc-toast {
  border: 1px solid var(--lc-border);
  border-left-width: 4px;
  border-radius: 8px;
  padding: 8px 10px;
  background: var(--lc-panel);
  max-width: 320px;
  box-shadow: 0 6px 20px rgba(0, 0, 0, 0.08);
  font-size: 0.92rem;
}

.lc-toast-success {
  border-left-color: #22863a;
}

.lc-toast-error {
  border-left-color: #cb2431;
}

.lc-toast-info {
  border-left-color: #1f6feb;
}

.lc-section {
  margin: 14px 0;
}

.lc-section h3 {
  margin-bottom: 8px;
}

.lc-expand summary {
  cursor: pointer;
  font-weight: 600;
  list-style: none;
  color: #1f6feb;
}

.lc-expand summary::-webkit-details-marker {
  display: none;
}

.lc-expand summary::before {
  content: "▸";
  display: inline-block;
  margin-right: 8px;
  transition: transform 0.15s ease;
}

.lc-expand[open] summary::before {
  transform: rotate(90deg);
}

.lc-expand > *:not(summary) {
  margin-top: 10px;
}