/* assets/css/mastery-meter.css */
.mastery-meter {
  border: 1px solid var(--color-neutral-lightest);
  border-radius: 0.5rem;
  padding: 1rem;
  background: var(--color-white);
}

.mastery-meter--mastered {
  border-color: var(--color-success);
}

.mastery-meter__header {
  display: flex;
  justify-content: space-between;
  align-items: baseline;
  margin-bottom: 0.75rem;
}

.mastery-meter__level {
  font-size: 1.5rem;
  font-weight: 700;
}

.mastery-meter__trend {
  font-size: 0.875rem;
  font-weight: 500;
}

.mastery-meter__trend--improving { color: var(--color-success); }
.mastery-meter__trend--stable { color: var(--color-neutral); }
.mastery-meter__trend--declining { color: var(--color-error); }

.mastery-meter__bar {
  position: relative;
  height: 0.5rem;
  background: var(--color-neutral-lightest);
  border-radius: 0.25rem;
  overflow: visible;
}

.mastery-meter__bar-fill {
  height: 100%;
  background: var(--color-yellow);
  border-radius: 0.25rem;
  transition: width 0.3s ease;
}

.mastery-meter__threshold {
  position: absolute;
  top: -4px;
  width: 2px;
  height: calc(100% + 8px);
  background: var(--color-neutral-dark);
}

.mastery-meter__footer {
  margin-top: 0.5rem;
  font-size: 0.875rem;
  color: var(--color-neutral);
}

.mastery-meter__mastered-label {
  color: var(--color-success);
  font-weight: 600;
}

.mastery-meter__toggle {
  display: block;
  margin-top: 0.75rem;
  padding: 0;
  border: none;
  background: none;
  color: var(--color-neutral);
  font-size: 0.75rem;
  cursor: pointer;
  text-decoration: underline;
}

.mastery-meter__toggle:hover {
  color: var(--color-neutral-dark);
}

.mastery-meter__chart {
  display: block;
  width: 100%;
  height: auto;
  margin-top: 0.5rem;
}