.panel { display: none; }
.panel.is-active { display: block; }

/* Assignment cards */
.assignment-list {
  display: flex;
  flex-direction: column;
  gap: var(--space-4);
}

.assignment-card {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  display: grid;
  grid-template-columns: 160px 1fr auto;
  gap: 0;
  overflow: hidden;
  box-shadow: var(--shadow-sm);
  transition: transform var(--transition-base), box-shadow var(--transition-base);
}

.assignment-card:hover {
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.assignment-card__thumb {
  position: relative;
  background: var(--color-surface-alt);
}

.assignment-card__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
  display: block;
}

.assignment-card__thumb-placeholder {
  width: 100%;
  height: 100%;
  display: flex;
  align-items: center;
  justify-content: center;
  color: var(--color-text-muted);
  font-size: 2rem;
}

.assignment-card__body {
  padding: var(--space-5);
}

.assignment-card__title {
  font-size: var(--text-base);
  font-weight: 600;
  margin-bottom: var(--space-3);
}

.assignment-card__meta {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  flex-wrap: wrap;
  margin-bottom: var(--space-3);
}

.assignment-card__progress-row {
  display: flex;
  align-items: center;
  gap: var(--space-3);
  margin-bottom: var(--space-2);
}

.assignment-card__progress-label {
  font-size: var(--text-xs);
  color: var(--color-text-muted);
  white-space: nowrap;
  width: 40px;
  text-align: right;
}

.assignment-card__action {
  display: flex;
  align-items: center;
  padding: var(--space-4);
  border-left: 1px solid var(--color-border);
  flex-shrink: 0;
}

@media (max-width: 640px) {
  .assignment-card {
    grid-template-columns: 1fr;
  }
  .assignment-card__thumb {
    height: 180px;
  }
  .assignment-card__action {
    border-left: none;
    border-top: 1px solid var(--color-border);
    justify-content: flex-end;
    padding: var(--space-3) var(--space-5);
  }
}

/* Progress page */
.progress-stats {
  display: grid;
  grid-template-columns: repeat(3, 1fr);
  gap: var(--space-6);
  margin-bottom: var(--space-8);
}

.progress-chart-wrap {
  background: var(--color-surface);
  border: 1px solid var(--color-border);
  border-radius: var(--radius-lg);
  padding: var(--space-6);
  height: 260px;
  position: relative;
}

@media (max-width: 768px) {
  .progress-stats { grid-template-columns: 1fr; }
}