/* 課題・タスク管理ビュー (self-introduction 和モダン リストスタイル) */
.tasks-control-bar {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  justify-content: space-between;
  gap: 16px;
  background-color: var(--color-surface);
  padding: 14px 20px;
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  margin-bottom: 24px;
  box-shadow: var(--shadow-sm);
}

.tasks-filters {
  display: flex;
  flex-wrap: wrap;
  align-items: center;
  gap: 12px;
}

.filter-btn-group {
  display: inline-flex;
  background-color: var(--bg-input);
  padding: 3px;
  border-radius: var(--radius-sm);
  border: 1px solid var(--color-line);
}

.filter-btn {
  padding: 5px 14px;
  font-size: 0.84rem;
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.03em;
  color: var(--color-text-muted);
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
  cursor: pointer;
}

.filter-btn:hover {
  color: var(--color-text);
}

.filter-btn.is-active {
  background-color: var(--color-surface-2);
  color: var(--color-matcha-light);
  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.25);
  border: 1px solid var(--color-line-strong);
}

.course-filter-select {
  padding: 6px 14px;
  font-size: 0.85rem;
  font-family: var(--font-body);
  background-color: var(--bg-input);
  border: 1px solid var(--color-line);
  border-radius: var(--radius-sm);
  color: var(--color-text);
  min-width: 170px;
  cursor: pointer;
}

.course-filter-select:focus {
  outline: none;
  border-color: var(--color-matcha);
  box-shadow: var(--shadow-focus);
}

/* タスク一覧リスト */
.tasks-grid {
  display: flex;
  flex-direction: column;
  gap: 10px;
}

.task-item {
  display: flex;
  align-items: center;
  justify-content: space-between;
  padding: 14px 18px;
  background-color: var(--color-surface);
  border: 1px solid var(--color-line);
  border-radius: var(--radius);
  box-shadow: var(--shadow-sm);
  transition: background var(--transition-fast), border-color var(--transition-fast), transform var(--transition-fast), box-shadow var(--transition-fast);
  position: relative;
  overflow: hidden;
}

.task-item:hover {
  background-color: var(--color-surface-2);
  border-color: var(--color-line-strong);
  transform: translateY(-2px);
  box-shadow: var(--shadow-md);
}

.task-item.is-completed {
  opacity: 0.6;
  background-color: color-mix(in srgb, var(--color-surface) 60%, var(--color-bg));
  border-color: var(--border-subtle);
}

.task-left {
  display: flex;
  align-items: flex-start;
  gap: 14px;
  flex: 1;
}

/* カスタムチェックボックス (和モダン セージグリーン) */
.task-checkbox-wrap {
  position: relative;
  width: 20px;
  height: 20px;
  margin-top: 2px;
  cursor: pointer;
  flex-shrink: 0;
}

.task-checkbox-wrap input {
  opacity: 0;
  width: 0;
  height: 0;
}

.task-checkbox-mark {
  position: absolute;
  top: 0;
  left: 0;
  width: 20px;
  height: 20px;
  background-color: var(--bg-input);
  border: 1px solid var(--color-line-strong);
  border-radius: var(--radius-xs);
  transition: all var(--transition-fast);
  display: flex;
  align-items: center;
  justify-content: center;
}

.task-checkbox-wrap:hover .task-checkbox-mark {
  border-color: var(--color-matcha);
}

.task-checkbox-wrap input:checked ~ .task-checkbox-mark {
  background-color: var(--color-matcha);
  border-color: var(--color-matcha);
}

.task-checkbox-mark::after {
  content: '';
  display: none;
  width: 5px;
  height: 9px;
  border: solid var(--color-bg);
  border-width: 0 2px 2px 0;
  transform: rotate(45deg);
  margin-bottom: 2px;
}

.task-checkbox-wrap input:checked ~ .task-checkbox-mark::after {
  display: block;
}

.task-content {
  display: flex;
  flex-direction: column;
  gap: 5px;
  flex: 1;
}

.task-header-row {
  display: flex;
  align-items: center;
  gap: 8px;
  flex-wrap: wrap;
}

.task-course-tag {
  font-family: var(--font-display);
  font-size: 0.72rem;
  font-weight: 700;
  letter-spacing: 0.03em;
  padding: 1px 7px;
  border-radius: var(--radius-xs);
  background-color: rgba(122, 184, 122, 0.15);
  color: var(--color-matcha-light);
  border: 1px solid rgba(122, 184, 122, 0.35);
}

.task-course-tag.theme-indigo { border-color: rgba(99, 102, 241, 0.4); color: #a5b4fc; background-color: rgba(99, 102, 241, 0.15); }
.task-course-tag.theme-forest { border-color: rgba(122, 184, 122, 0.4); color: var(--color-matcha-light); background-color: rgba(122, 184, 122, 0.15); }
.task-course-tag.theme-teal   { border-color: rgba(20, 184, 166, 0.4); color: #5eead4; background-color: rgba(20, 184, 166, 0.15); }
.task-course-tag.theme-rose   { border-color: rgba(244, 91, 105, 0.4); color: #ff9da6; background-color: rgba(244, 91, 105, 0.15); }
.task-course-tag.theme-amber  { border-color: rgba(229, 169, 60, 0.4); color: #f7ce7a; background-color: rgba(229, 169, 60, 0.15); }
.task-course-tag.theme-purple { border-color: rgba(168, 85, 247, 0.4); color: #d8b4fe; background-color: rgba(168, 85, 247, 0.15); }

.task-title {
  font-family: var(--font-display);
  font-size: 0.98rem;
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--color-text);
  line-height: 1.4;
}

.task-item.is-completed .task-title {
  text-decoration: line-through;
  color: var(--color-text-muted);
}

.task-desc {
  font-size: 0.85rem;
  color: var(--color-text-muted);
  line-height: 1.6;
  white-space: pre-wrap;
}

.task-right {
  display: flex;
  align-items: center;
  gap: 16px;
}

.task-due {
  display: flex;
  align-items: center;
  gap: 6px;
  font-size: 0.8rem;
  font-family: var(--font-mono);
  color: var(--color-text-muted);
  background-color: var(--bg-input);
  padding: 4px 10px;
  border-radius: var(--radius-xs);
  border: 1px solid var(--color-line);
}

.task-due.is-overdue {
  background-color: var(--danger-bg);
  color: #ff9da6;
  border-color: var(--danger-border);
  font-weight: 700;
}

.task-due.is-today {
  background-color: var(--warning-bg);
  color: #f7ce7a;
  border-color: var(--warning-border);
  font-weight: 700;
}

.task-actions {
  display: flex;
  align-items: center;
  gap: 6px;
}

.tasks-empty {
  text-align: center;
  padding: 48px 24px;
  background-color: var(--color-surface);
  border: 1px dashed var(--color-line);
  border-radius: var(--radius);
  color: var(--color-text-muted);
}

.tasks-empty__icon {
  font-size: 2.2rem;
  margin-bottom: 10px;
}

.tasks-empty__text {
  font-family: var(--font-display);
  font-size: 0.92rem;
  font-weight: 700;
}

@media (max-width: 768px) {
  .task-item {
    flex-direction: column;
    align-items: stretch;
    gap: 12px;
  }
  .task-right {
    justify-content: space-between;
    border-top: 1px solid var(--color-line);
    padding-top: 10px;
  }
}